Liquid injection port structure, battery monomer, battery and electric equipment

Abstract

The embodiment of the utility model provides a liquid injection port structure, a battery monomer, a battery and electric equipment, and relates to the technical field of batteries. The liquid injection port structure provided by the embodiment of the utility model comprises a base body and a covering piece, and the base body is used for being fixed with a shell of a battery monomer so as to define a liquid injection space with the shell; a liquid injection hole is formed in the base body, and the liquid injection hole penetrates through the base body in the thickness direction of the base body so as to communicate with the liquid injection space; the covering part is movably connected with the base body so that the covering part can move relative to the base body, the direction of movement of the covering part relative to the base body is the extension direction of the base body, and the covering part can open and close the liquid injection hole. The liquid injection opening structure is used for being in butt joint with liquid injection equipment so that the liquid injection equipment can inject liquid into the liquid injection space through the liquid injection opening structure. The liquid injection port structure provided by the utility model can improve the processing and manufacturing convenience of the battery monomer.

Description

Technical Field

[0001] The present application relates to the technical field, and in particular to a liquid filling port structure, a battery cell, a battery and an electrical device. Background Art

[0002] During the production of battery cells, after the cover and shell of the battery cell are assembled together, a series of processes are often required, during which the injection hole of the battery cell needs to be repeatedly opened and closed. In the related art, the injection hole is repeatedly opened and closed by repeatedly inserting and removing the glue nail from the injection hole. The process is relatively cumbersome and the production of battery cells is not convenient. Summary of the invention

[0003] The embodiments of the present application provide a liquid injection port structure, a battery cell, a battery and an electrical device, which can improve the convenience of processing and manufacturing the battery cell.

[0004] In the first aspect, the present application provides a liquid injection port structure, which includes a base and a cover member, wherein the base is used to be fixed to the outer shell of the battery cell to form a liquid injection space together with the outer shell; an injection hole is formed on the base, and the injection hole penetrates the base along the thickness direction of the base to be connected with the liquid injection space; the cover member is movably connected to the base so that the cover member can move relative to the base, and the direction of movement of the cover member relative to the base is the extension direction of the base, so that the cover member can open and close the injection hole.

[0005] By movably connecting the cover part on the base and making the movement direction of the cover part relative to the base the extension direction of the base, the process of opening and closing the injection hole can be achieved by adjusting the position of the cover part relative to the base. The process of opening and closing the injection hole is efficient and convenient, which is conducive to improving the convenience of battery cell processing and manufacturing.

[0006] In some implementations of the present application, the cover member and the base body are slidably matched along the extension direction of the base body, so that the cover member can open and close the liquid injection hole.

[0007] The movable connection between the cover part and the base is realized by making the cover part and the base slide together, which has high reliability and is convenient to realize.

[0008] In some implementations of the present application, the injection hole includes a first hole segment, and a first slide groove is formed on the base. In a first radial direction of the first hole segment, the first slide groove is located on one side of the first hole segment, and the first slide groove faces the first hole segment along the first radial direction; the covering member slides with the first slide groove along the first radial direction so that the covering member can extend out of the first slide groove through the first slide groove on a side close to the injection hole to close the first hole segment.

[0009] By forming a first slide groove on the base, the cover member slides with the base through the first slide groove, and the processing and manufacturing are relatively convenient. By making the first slide groove face the first hole section along the first radial direction, the cover member slides with the first slide groove along the first radial direction, so that the first slide groove can be extended through the side of the first slide groove close to the injection hole to close the first hole section. The structure is relatively simple, which is conducive to improving the convenience of processing and manufacturing.

[0010] In some implementations of the present application, the injection hole includes a first hole segment, and the base is formed with a first matching cavity. In a first radial direction of the first hole segment, the first matching cavity is located on one side of the first hole segment, and the inner wall of the first matching cavity includes two first wall surfaces that are axially opposite to each other along the first hole segment; when the first part of the covering member closes the first hole segment, the second part of the covering member is supported between the two first wall surfaces so that the first part applies a preload force to the end face of the first end of the first hole segment.

[0011] By making the first part apply a pre-tightening force to the end surface of the first end of the first hole segment, the first part and the end surface of the first end of the first hole segment are closely fitted, which is conducive to improving the sealing effect of the cover member on the injection hole. By forming two first walls on the base body, the second part of the cover member is supported between the two first walls, and the two first walls limit the position of the cover member relative to the first hole segment in the axial direction of the first hole segment, so that the first part applies a pre-tightening force to the end surface of the first end of the first hole segment, the base body is fully utilized, the structure is relatively simple, and the processing and manufacturing are relatively convenient.

[0012] In some implementations of the present application, the second part can be slidably supported between the two first walls so that the covering member is movably connected to the base; or the direction of movement of the covering member relative to the base is parallel to the first wall, so that the covering member can extend between the two first walls and can be removed from between the two first walls.

[0013] By making the second part slidably supported between the two first walls, so that the cover is movably connected to the base, the first wall is not only used to limit the position of the cover relative to the first hole section in the axial direction of the first hole section, but also can be used to make the cover move with the base, so that the cover can move relative to the base to open and close the injection hole, the utilization rate of the first wall is high, which is conducive to simplifying the structure. By making the direction of movement of the cover relative to the base parallel to the first wall, so that the cover can extend between the two first walls and can be removed from between the two first walls, the cover can be easily extended or extended from between the two first walls, which is conducive to improving the simplification of the structure.

[0014] In some implementations of the present application, one of the two first walls is formed on an end surface of the first end of the first hole segment.

[0015] By forming one of the two first wall surfaces on the end surface of the first end of the first hole segment, it is helpful to simplify the structure. It can be understood that the end surface of the first hole segment is perpendicular to the axial direction of the first hole segment, and using the end surface of the first hole segment as the first wall surface is helpful to simplify the structure and improve the convenience of processing and manufacturing. When the cover piece closes the first hole segment, it fits tightly with the end surface of the first end of the first hole segment. Using the end surface of the first end of the first hole segment as the first wall surface is helpful to make the shape of the cover piece simpler, and only a shorter extension length is needed to close the first hole segment, which is helpful to improve the convenience of processing and manufacturing the cover piece.

[0016] In some implementations of the present application, the two first walls have a first gap on one side facing the first hole segment, and the first portion of the covering member extends out of the first matching cavity through the first gap to be able to open and close the first hole segment.

[0017] By allowing the first part of the covering member to extend out of the first matching cavity through the first spacer, the first spacer is formed between the two first wall surfaces facing the side of the first hole section, so that the covering member can extend out of the matching cavity through the first spacer by extending along the first direction to open and close the first hole section, which is beneficial to making the shape of the covering member simpler and improving the convenience of processing and manufacturing the covering member.

[0018] In some implementations of the present application, the covering member slides with the first mating cavity along a first radial direction to open and close the first hole section; or, the direction of relative movement between the covering member and the base is the first radial direction, so that the second part can extend into between the two first walls through the first gap, and can escape from between the two first walls through the first gap.

[0019] By making the cover piece slide and cooperate with the first matching cavity along the first radial direction, that is, making the relative sliding direction of the cover piece and the first matching cavity parallel to the direction of the first interval, the cover piece opens and closes the injection hole by adjusting the length of the cover piece extending from the first matching cavity along the first radial direction through the first interval, and the utilization rate of the first interval is high, which is conducive to simplifying the structure. By making the direction of movement of the cover piece relative to the base body the first radial direction, so that the second part can extend into between the two first wall surfaces through the first interval, and can escape from between the two first wall surfaces through the first interval, the utilization rate of the first interval is high, which is conducive to improving the simplification of the structure.

[0020] In some implementations of the present application, a first matching groove is formed on the inner wall of the injection hole, the depth direction of the first matching groove is away from the central axis of the first hole segment, and the first matching cavity is the inner cavity of the first matching groove.

[0021] By making the inner cavity of the first matching groove as the first matching cavity, the structure of the base body is relatively simple, and the processing and manufacturing of the first matching cavity is relatively convenient. Moreover, it can be understood that the inner cavity of the first matching groove is used as the inner cavity of the first matching cavity, and the first matching cavity is a part of the injection hole, which is located in the middle of the injection hole in the axial direction. In this way, the cover is also arranged in the injection hole, and the cover can seal the hole sections of the injection hole located on both sides of the first matching cavity in the axial direction, which is conducive to improving the sealing effect of the cover on the injection hole.

[0022] In some implementations of the present application, the number of first mating cavities is at least two, and at least two first mating cavities are arranged along the circumference of the first hole segment; at least two first mating cavities are mated with the same covering piece; and / or at least two first mating cavities are mated with at least two covering pieces respectively, so that at least two covering pieces can jointly open and close the first hole segment.

[0023] By providing at least two first matching cavities arranged along the circumference of the first hole segment, the total length of all first wall surfaces in the circumference of the first hole segment increases, which is conducive to improving the sealing effect of the cover member on the first hole segment. By making at least two first matching cavities cooperate with at least two cover members respectively, the volume of a single cover member can be slightly smaller, which is convenient for processing and manufacturing a single cover member. By making at least two first matching cavities cooperate with the same cover member, the cover member has a higher integrity, which is conducive to improving the sealing effect.

[0024] In some implementations of the present application, along the first radial direction, at least two first matching cavities are disposed on opposite sides of the first hole segment.

[0025] By arranging at least two of the first mating cavities on opposite sides of the first hole segment along the first radial direction, the parts of the end face of the first end of the first hole segment located on both sides of the first hole segment in the first radial direction can generate a strong force with the covering member, which is beneficial to improving the sealing effect of the covering member.

[0026] In some implementations of the present application, at least two first mating cavities respectively cooperate with at least two covering parts so that the at least two covering parts can jointly open and close the injection hole; at least two first mating cavities have a spacing along the axial direction of the first hole segment, so that when the at least two covering parts can jointly close the injection hole, the first parts of the at least two covering parts are distributed in a stacked manner along the axial direction of the first hole segment.

[0027] By making the first parts of the at least two covering members distributed in a stacked manner along the axial direction of the first hole section, it is beneficial to improve the sealing effect of the at least two covering members on the first hole section.

[0028] In some implementations of the present application, the substrate includes a substrate body and a mating piece, a first mating cavity is formed on the mating piece, the substrate body is used to be integrally combined with the outer shell, and a second mating cavity is formed on the substrate body. In a first radial direction of the first hole segment, the second mating cavity is located on one side of the first hole segment, and an inner wall of the second mating cavity includes two second wall surfaces that are axially opposite to each other along the first hole segment, and the mating piece is detachably supported between the two second wall surfaces.

[0029] By making the base body include a detachably connected base body and a matching piece, the cover piece is installed on the base body through the matching piece, which facilitates the installation of the cover piece on the base and can conveniently realize the movable connection between the cover piece and the base.

[0030] In some implementations of the present application, a through hole is formed on the base body, and the through hole penetrates the base body along the thickness direction of the base body; a second matching groove is formed on the inner wall of the through hole, and the depth direction of the second matching groove deviates from the central axis of the through hole, and the second matching cavity is the inner cavity of the second matching groove, and the two side surfaces of the second matching groove opposite to each other along the axial direction of the through hole are respectively two second wall surfaces; the matching piece extends out of the second matching groove through the opening of the second matching groove away from its own bottom surface; there is a first gap between the two first wall surfaces facing away from the second matching groove, and the covering piece extends out of the first matching cavity through the first gap so as to be able to close the through hole.

[0031] By making the mating piece extend out of the second mating groove away from the opening on its bottom surface, that is, the covering piece and the mating piece can jointly close the through hole, the length of the covering piece in the depth direction of the second mating groove is slightly shorter, and the through hole can also be fully closed, which is beneficial to improving the convenience of processing and manufacturing the covering piece.

[0032] In some implementations of the present application, an operating protrusion is formed on the side of the cover member facing away from the inner cavity of the shell along the axial direction of the liquid injection hole, and the operating protrusion is used to be pushed to move the cover member relative to the base.

[0033] By forming an operating protrusion on the side of the cover member facing away from the inner cavity of the shell, a person can push the protrusion to move the cover member relative to the base, which is conducive to improving the convenience of adjusting the relative posture of the cover member and the base.

[0034] In a second aspect, the present application provides a battery cell, which includes a shell, an electrolyte and the liquid injection port structure provided in the first aspect of the present application, wherein the base is fixed to the shell to form a liquid injection space with the shell; the electrolyte is filled in the liquid injection space.

[0035] The battery cell provided in the present application includes the liquid injection port structure provided in the first aspect of the present application, which can achieve the same effect, that is, it can improve the convenience of processing and manufacturing the battery cell.

[0036] In a third aspect, the present application provides a battery, comprising the battery cell provided in the second aspect of the present application, wherein the number of the battery cells is at least two, and the at least two battery cells are distributed in an array and are connected in series, in parallel or in a mixed manner through a busbar component.

[0037] The battery cell provided in the present application includes the battery cell provided in the second aspect of the present application, which can achieve the same effect, that is, can improve the convenience of processing and manufacturing the battery cell.

[0038] In a fourth aspect, the present application provides an electrical device, which includes an electrical body and the battery provided in the third aspect of the present application, and the battery is used to supply power to the electrical body.

[0039] The battery cell provided in the present application includes the battery provided in the third aspect of the present application, which can achieve the same effect, that is, it can improve the convenience of processing and manufacturing the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the structure of a battery cell in some embodiments of the present application;

[0041] Figure 2 An exploded view of a battery cell in some embodiments of the present application;

[0042] Figure 3 This is one of the structural schematic diagrams of the liquid injection hole in some embodiments of the present application in an open state;

[0043] Figure 4 This is the second structural schematic diagram of the liquid injection hole in some embodiments of the present application in an open state;

[0044] Figure 5 This is a schematic diagram of a structure in which a covering member is not installed on a base in some embodiments of the present application;

[0045] Figure 6 It is a schematic diagram of the structure of the cover member in some embodiments of the present application;

[0046] Figure 7 for Figure 4 Sectional view at DD in the middle;

[0047] Figure 8 for Figure 5 Sectional view at EE in the middle;

[0048] Fig. 9 This is one of the structural schematic diagrams of the liquid injection hole in some embodiments of the present application in a closed state;

[0049] Fig.10 This is the second structural schematic diagram of the liquid injection hole in some embodiments of the present application in a closed state;

[0050] Fig.11 for Fig. 9 Cross-section at FF;

[0051] Fig.12 This is one of the cross-sectional views of the liquid injection hole in some embodiments of the present application in a closed state;

[0052] Fig.13 One of the cross-sectional views of the liquid injection hole in some embodiments of the present application in an open state;

[0053] Fig.14 The second cross-sectional view of the liquid injection hole in some embodiments of the present application in a closed state;

[0054] Fig.15 is a cross-sectional view of a base body in some embodiments of the present application;

[0055] Fig.16 This is one of the structural schematic diagrams of the cooperation between the covering member and the matching member in some embodiments of the present application;

[0056] Fig.17 This is the second structural schematic diagram of the cooperation between the covering member and the matching member in some embodiments of the present application;

[0057] Fig.18 This is the third structural schematic diagram of the cooperation between the covering member and the matching member in some embodiments of the present application;

[0058] Fig.19 This is the third structural schematic diagram of the liquid injection hole in some embodiments of the present application in an open state;

[0059] Fig. 20 This is a fourth structural schematic diagram of the liquid injection hole in some embodiments of the present application in an open state;

[0060] Fig.21 for Fig.19 Cross-section at GG in the middle;

[0061] Fig. 22 This is the third structural schematic diagram of the liquid injection hole in some embodiments of the present application in a closed state;

[0062] Fig.23 This is a fourth structural schematic diagram of the liquid injection hole in some embodiments of the present application in a closed state;

[0063] Fig.24 for Fig. 22 Cross-section view at HH in the middle.

[0064] Reference numerals:

[0065] 1-liquid injection port structure; 11-base; 111-liquid injection hole; 1111-first hole section; 1112-first matching cavity; 11121-first wall; 11122-first interval; 112-base body; 1121-through hole; 11211-second matching cavity; 1122-second wall; 113-matching piece; 12-cover piece; 121-first part; 122-second part; 123-operating protrusion; 13-electrode terminal; 14-pressure relief mechanism; 2-shell; 3-electrode assembly; a-axial direction of liquid injection hole; b-first sliding direction; c-first radial direction. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application are further elaborated in detail below in conjunction with the drawings and embodiments. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0067] In the following description, reference is made to "some embodiments", which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments. In the absence of conflict, the embodiments in this application and the technical features in the embodiments may be combined with each other.

[0068] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as representing a specific ordering of objects, nor can they be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0069] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0070] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0071] In the embodiments of the present application, words such as "exemplarily" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplarily" or "for example" is intended to present related concepts in a specific way.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. The terms used herein are only for the purpose of describing the present disclosure and are not intended to limit the present disclosure.

[0073] During the production of battery cells, after the cover and shell of the battery cell are assembled together, a series of processes are often required. For example, the processes of transportation, heating, liquid injection, infiltration, formation and aging are generally required. During this process, the liquid injection hole of the battery cell needs to be repeatedly opened and closed. For example, the liquid injection hole needs to be opened during the processes of heating, liquid injection, formation and aging, and the liquid injection hole needs to be closed during the processes of transportation and infiltration.

[0074] In the related art, the injection hole is repeatedly opened and closed by repeatedly inserting and removing a plastic nail into and from the injection hole. This process is rather cumbersome and the production of battery cells is not convenient enough.

[0075] Moreover, the process of inserting the glue nail into the injection hole can easily bring foreign matter into the injection hole, which can easily affect the yield rate of the battery cell. In addition, the sealing effect of the glue nail is not reliable enough. In the process of finally sealing the injection hole, it is often necessary to weld a metal plate on the injection hole to seal the injection hole with the metal plate, which further increases the complexity of processing and manufacturing, and is prone to welding scrap, further reducing the yield rate of the battery cell.

[0076] The present application provides a liquid injection port structure, which is used to dock with a liquid injection device so that the liquid injection device can inject electrolyte into the liquid injection space through the liquid injection port structure.

[0077] The liquid injection port structure includes a base and a cover. The base is used to be fixed to the outer shell of the battery cell to form a liquid injection space with the outer shell; a liquid injection hole is formed on the base, and the liquid injection hole penetrates the base along the thickness direction of the base to communicate with the liquid injection space; the cover is movably connected to the base so that the cover can move relative to the base, and the direction of movement of the cover relative to the base is the extension direction of the base, so that the cover can open and close the liquid injection hole. By movably connecting the cover on the base and making the movement direction of the cover relative to the base the extension direction of the base, the process of opening and closing the liquid injection hole can be achieved by adjusting the position of the cover relative to the base. The process of opening and closing the liquid injection hole is efficient and convenient, which is conducive to improving the convenience of battery cell processing and manufacturing.

[0078] Moreover, the sealing of the liquid injection hole by the cover can replace the operation of inserting the glue nail and welding the metal plate, avoiding the problems of foreign matter being easily brought into the liquid injection hole during the process of inserting the glue nail and welding scrap, which is beneficial to improving the yield of the battery cell.

[0079] The injection port structure provided in the present application is suitable for a battery cell. The battery cell includes a shell, an electrolyte and an injection port structure. The base is fixed to the shell to form an injection space with the shell; the electrolyte is filled in the injection space.

[0080] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0081] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0082] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0083] The battery cell provided in this application is suitable for use in a battery, and the battery includes a battery cell, and the number of battery cells is at least two, and at least two battery cells are distributed in an array and connected in series, in parallel or in mixed connection through a confluence component. The battery provided in this application can be a battery module, a battery pack or an energy storage system, etc.

[0084] The battery provided in the present application is suitable for use in electrical equipment, which includes an electrical body and a battery, and the battery is used to power the electrical body. For example, the electrical equipment may be a mobile phone, a portable device, a laptop computer, a battery car, an electric toy, an electric tool, a vehicle, a ship, and a spacecraft, for example, a spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft.

[0085] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0086] Please refer to Figure 1 , Figure 2 and Figure 3 The present application provides a liquid injection port structure 1, which includes a base 11 and a cover 12. The base 11 is used to be fixed to the outer shell of the battery cell to form a liquid injection space together with the outer shell; a liquid injection hole 111 is formed on the base 11, and the liquid injection hole 111 penetrates the base 11 along the thickness direction of the base 11 to communicate with the liquid injection space; the cover 12 is movably connected to the base 11 so that the cover 12 can move relative to the base 11, and the direction of movement of the cover 12 relative to the base 11 is the extension direction of the base 11, so that the cover 12 can open and close the liquid injection hole 111.

[0087] The housing in the embodiment of the present application includes components for encapsulating the electrode assembly 3 and the electrolyte, etc. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0088] Generally, the housing includes an end cap and a shell 2, the shell 2 is provided with an opening, the end cap closes the opening to form a liquid injection space with the shell 2, and the liquid injection space is a closed space for accommodating the electrode assembly 3 and electrolytes and other substances. The shell 2 may be provided with one or more openings. In some embodiments of the present application, the housing may only include the shell 2, so that the substrate 11 is combined with the opening to enclose the liquid injection space with the shell 2, that is, the liquid injection port structure 1 serves as the end cap of the shell 2. Of course, in some embodiments of the present application, the housing may also only include the end cap, the substrate 1 is formed with a accommodating cavity with an opening, and the end cap closes the opening to enclose the liquid injection space with the substrate.

[0089] In some embodiments of the present application, the liquid injection port structure 1 also includes an electrode terminal 13 and a pressure relief mechanism 14. The electrode terminal 13 and the pressure relief mechanism 14 are both arranged on the substrate 11. The electrode terminal 13 is electrically connected to the electrode ear, and the pressure relief mechanism 14 is used to release the internal pressure of the liquid injection space.

[0090] The substrate 11 in the embodiment of the present application may be located on the end cover or on the housing 2 , and the embodiment of the present application does not limit this.

[0091] In the embodiment of the present application, the thickness direction of the substrate 11 is also the axial direction a of the injection hole, and the extension direction of the substrate 11 is perpendicular to the thickness direction of the substrate 11. In the thickness direction of the substrate 11, one side of the substrate 11 is the inside of the injection space, and the other side is the outside of the injection space.

[0092] The cross-sectional shape of the cover member 12 in the embodiment of the present application is not limited, and may be circular, square, semicircular, etc. The cross-sectional shape of the cover member 12 is a cross-sectional shape perpendicular to the axial direction of the cover member 12 and the injection hole 111 .

[0093] By movably connecting the cover part 12 on the base 11 and making the movement direction of the cover part 12 relative to the base 11 the extension direction of the base 11, the process of opening and closing the injection hole 111 can be achieved by adjusting the position of the cover part 12 relative to the base 11. The process of opening and closing the injection hole 111 is efficient and convenient, which is conducive to improving the convenience of battery cell processing and manufacturing.

[0094] In the heating, liquid injection, formation, and aging processes, the liquid injection hole 111 is opened for gas / liquid exchange to achieve functions such as dehydration, electrolyte injection, and exhaust; in the transportation and infiltration processes, closed-mouth transportation is performed to prevent the battery cell from absorbing moisture, thereby reducing the humidity control cost of the battery cell process and reducing the risk of moisture absorption by the battery cell to ensure product quality. In addition, the liquid injection port structure 1 can be integrated into the battery cell, and while meeting the requirements of the battery cell's water isolation, exhaust, and liquid flow functions, it replaces the current process process in which the battery cell needs to be nailed with glue after the second injection, reducing the process steps, further reducing the process equipment cost and time, and improving efficiency.

[0095] The closed-mouth transportation of battery cells can solve the problem of electrolyte overflow or splashing when the battery is subjected to external forces such as bumps and vibrations during the battery cell process after the filling is completed, thereby reducing electrolyte contamination and ensuring the excellent appearance of the product.

[0096] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 The cover member 12 and the base body 11 are slidably matched along the extension direction of the base body 11 , so that the cover member 12 can open and close the injection hole 111 .

[0097] In the embodiment of the present application, the sliding direction of the covering member 12 relative to the base 11 in the first sliding direction b is shown in the figure.

[0098] In the embodiment of the present application, the sliding fit between the cover member 12 and the base 11 along the extension direction of the base 11 can be realized in various forms. For example, in some embodiments of the present application, a first slide groove can be formed on the base 11, and the cover member 12 can slide with the first slide groove. In other embodiments of the present application, a second slide groove can be formed on the cover member 12, and the base 11 can slide with the second slide groove.

[0099] The cover member 12 and the base body 11 are slidably matched to achieve a movable connection between the cover member 12 and the base body 11 , which has high reliability and is relatively convenient to implement.

[0100] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 The injection hole 111 includes a first hole section 1111, and a first slide groove is formed on the base body 11. On the first radial direction c of the first hole section 1111, the first slide groove is located on one side of the first hole section 1111, and the first slide groove faces the first hole section 1111 along the first radial direction c; the covering member 12 slides with the first slide groove along the first radial direction c, so that the covering member 12 can extend out of the first slide groove through the first slide groove on one side close to the injection hole 111 to close the first hole section 1111.

[0101] In the embodiment of the present application, the first hole segment 1111 is a segment of the injection hole 111 in the axial direction, and may be located at the end of the injection hole 111 in the axial direction, or may be located at the middle of the injection hole 111 in the axial direction.

[0102] In the embodiment of the present application, on the first radial direction c of the first hole segment 1111 , the first sliding groove is located on one side of the first hole segment 1111 , that is, the first hole segment 1111 and the first sliding groove are arranged along the first radial direction c.

[0103] In the embodiment of the present application, the first slide groove is oriented toward the first hole section 1111 along the first radial direction c. For example, the depth direction of the first slide groove may be the first radial direction c, and the depth direction of the first slide groove is away from the central axis of the first hole section 1111, so that the opening of the first slide groove away from its bottom surface is oriented toward the central axis of the first hole section 1111. The first slide groove is oriented toward the first hole section 1111 along the first radial direction c, or the length direction of the first slide groove is the first radial direction c. The first slide groove is a half-through groove or a full-through groove. One end of the first slide groove close to the first hole section 1111 passes through the base 11 along the first radial direction c, so that the cover 12 can extend out of the first slide groove through the side of the first slide groove close to the injection hole 111.

[0104] In the embodiment of the present application, the first slide groove can be arranged outside the injection hole 111, or can be formed on the inner wall of the injection hole 111, which is not limited in the embodiment of the present application. In some embodiments of the present application, the first slide groove can be formed on the end surface of one end of the injection hole 111. In this way, the shape of the cover 12 is relatively simple, and the processing and manufacturing of the cover 12 is relatively convenient.

[0105] By forming a first slide groove on the base 11, the cover 12 slides with the base 11 through the first slide groove, and the processing and manufacturing are relatively convenient. By making the first slide groove toward the first hole section 1111 along the first radial direction c, the cover 12 slides with the first slide groove along the first radial direction c, so that the first slide groove can be extended through the side of the first slide groove close to the injection hole 111 to close the first hole section 1111. The structure is relatively simple, which is conducive to improving the convenience of processing and manufacturing.

[0106] In some embodiments of this application, please refer to Figure 3 to Figure 11 , Figure 3 to Figure 11 Belong to the same embodiment. Figure 3 to Figure 8 It mainly shows the opening state of the liquid injection port structure 1. Figures 9 to 11 The closed state of the liquid injection port structure 1 is mainly shown. Specifically, Figure 3 and Figure 4 The structure of the liquid injection port structure 1 in an open state is shown from two different perspectives. For further clarity, Figure 5 The base 11 of the liquid injection port structure 1 is shown separately. Figure 6 The cover 12 of the liquid filling port structure 1 is shown. Figure 7 and Figure 8 The internal structure of the liquid injection port structure 1 is shown in a cross-sectional view. Figure 7 and Figure 8 The injection hole 111 and the structure near the injection hole 111 are captured for display. Fig. 9 and Fig.10 The structure of the liquid injection port structure 1 in a closed state is shown from two different perspectives. Fig.11 The internal structure of the liquid injection port structure 1 is shown in a cross-sectional view. Fig.11The injection hole 111 and the structure near the injection hole 111 are intercepted for display. In this embodiment, the injection hole 111 includes a first hole segment 1111, and the base body 11 is formed with a first matching cavity 1112. On the first radial direction c of the first hole segment 1111, the first matching cavity 1112 is located on one side of the first hole segment 1111, and the inner wall of the first matching cavity 1112 includes two first wall surfaces 11121 arranged opposite to each other along the axial direction of the first hole segment 1111; when the first part 121 of the cover 12 closes the first hole segment 1111, the second part 122 of the cover 12 is supported between the two first wall surfaces 11121, so that the first part 121 applies a pre-tightening force to the end surface of the first end of the first hole segment 1111.

[0107] In the embodiment of the present application, the first portion 121 contacts the end surface of the first end of the first hole segment 1111, and applies a pre-tightening force to the end surface of the first end of the first hole segment 1111 to close the opening of the first end of the first hole segment 1111, thereby sealing the injection hole 111. It can be understood that when the first portion 121 contacts the end surface of the first end of the first hole segment 1111, the first portion 121 can cover the opening of the first end of the first hole segment 1111.

[0108] In the embodiment of the present application, the first portion 121 contacts the end surface of the first end of the first hole segment 1111 and applies a pre-tightening force to the end surface of the first end of the first hole segment 1111 to close the first end of the first hole segment 1111 and thereby seal the injection hole 111.

[0109] By making the first part 121 apply a pre-tightening force to the end face of the first end of the first hole section 1111, that is, the cover 12 and the first matching cavity 1112 are interference-fitted, so that the first part 121 and the end face of the first end of the first hole section 1111 are closely fitted, which is conducive to improving the sealing effect of the cover 12 on the injection hole 111. By forming two first walls 11121 on the base 11, the second part 122 of the cover 12 is supported between the two first walls 11121, and the two first walls 11121 limit the position of the cover 12 relative to the first hole section 1111 in the axial direction of the first hole section 1111, so that the first part 121 applies a pre-tightening force to the end face of the first end of the first hole section 1111, and the base 11 is fully utilized, the structure is relatively simple, and the processing and manufacturing are relatively convenient.

[0110] In some embodiments of the present application, please refer to 6, Figure 7 and Figure 8 The first matching cavity 1112 may be an inner cavity of the first slide groove, and the two side walls of the first slide groove opposite to each other in the axial direction of the first hole section 1111 are respectively two first wall surfaces 11121 .

[0111] In some embodiments of the present application, please refer to 6, Figure 7 and Figure 8 The second part 122 can be slidably supported between the two first walls 11121 so that the covering member 12 is movably connected to the base 11; or the direction in which the covering member 12 moves relative to the base 11 is parallel to the first wall 11121, so that the covering member 12 can extend between the two first walls 11121 and can escape from between the two first walls 11121.

[0112] In the embodiment of the present application, the second part 122 can be slidably supported between the two first walls 11121, so that the second part 122 is supported between the two first walls 11121 and can slide along the first walls 11121, and the injection hole 111 is opened and closed during the sliding of the second part 122 along the first wall 11121.

[0113] By making the second part 122 slidably supported between the two first walls 11121, so that the cover 12 is movably connected to the base 11, the first wall 11121 is not only used to limit the position of the cover 12 relative to the first hole section 1111 in the axial direction of the first hole section 1111, but also can be used to make the cover 12 movably connected to the base 11, so that the cover 12 can move relative to the base 11 to open and close the injection hole 111, and the utilization rate of the first wall 11121 is high, which is conducive to simplifying the structure. By making the direction of movement of the cover 12 relative to the base 11 parallel to the first wall 11121, so that the cover 12 can extend between the two first walls 11121, and can be removed from between the two first walls 11121, so that the cover 12 can easily extend or extend from between the two first walls 11121, which is conducive to improving the simplification of the structure.

[0114] In some embodiments of the present application, please refer to 12 and Fig.13 , Fig.12 and Fig.13 Belonging to the same embodiment, the number of the first matching cavities 1112 may be at least two, and the second part 122 may be slidably supported between the two first walls 11121 of at least one first matching cavity 1112, so that the covering member 12 is movably connected to the base 11, and the direction in which the covering member 12 moves relative to the base 11 is parallel to the first wall 11121 of at least another first matching cavity 1112, so that the covering member 12 can extend between the two first walls 11121 of at least another first matching cavity 1112, and can escape from between the two first walls 11121.

[0115] In some embodiments of this application, please refer to Figure 6 , Figure 7 and Figure 8, the number of the first matching cavities 1112 may be at least two, and the number of the cover pieces 12 may also be at least two, and they are arranged one-to-one with the first matching cavities 1112. The second portion 122 of each cover piece 12 may be slidably supported between the two first walls 11121 of the corresponding first matching cavity 1112, so that the cover piece 12 is movably connected to the base 11; or the direction of movement of each cover piece 12 relative to the base 11 is parallel to the first wall 11121 of the corresponding first matching cavity 1112, so that the cover piece 12 can extend between the two first walls 11121 of the corresponding first matching cavity 1112, and can be moved from between the two first walls 11121. It can also be that at least one cover piece 12 is slidably supported between the two first walls 11121 of the corresponding first matching cavity 1112, so that the cover piece 12 is movably connected to the base 11, and the direction of movement of at least another cover piece 12 relative to the base 11 is parallel to the first wall 11121 of the corresponding first matching cavity 1112, so that the cover piece 12 can extend between the two first walls 11121 of the corresponding first matching cavity 1112, and can escape from between the two first walls 11121. Of course, in some embodiments of the present application, the number of the first matching cavity 1112 can also be one.

[0116] In some embodiments of this application, please refer to Figure 6 , Figure 7 and Figure 8 One of the two first wall surfaces 11121 is formed on the end surface of the first end of the first hole section 1111 .

[0117] By forming one of the two first wall surfaces 11121 on the end surface of the first end of the first hole segment 1111, it is helpful to simplify the structure. It can be understood that the end surface of the first hole segment 1111 is perpendicular to the axial direction of the first hole segment 1111, and using the end surface of the first hole segment 1111 as the first wall surface 11121 is helpful to simplify the structure and improve the convenience of processing and manufacturing. When the cover 12 closes the first hole segment 1111, it fits tightly with the end surface of the first end of the first hole segment 1111. By using the end surface of the first end of the first hole segment 1111 as the first wall surface 11121, it is helpful to make the shape of the cover 12 simpler, and only a shorter extension length is required to close the first hole segment 1111, which is helpful to improve the convenience of processing and manufacturing of the cover 12.

[0118] In some embodiments of this application, please refer to Figure 6 , Figure 7 and Figure 8The two first walls 11121 have a first spacer 11122 on one side facing the first hole section 1111 , and the first portion 121 of the covering member 12 extends out of the first matching cavity 1112 through the first spacer 11122 to be able to open and close the first hole section 1111 .

[0119] In the embodiment of the present application, the covering member 12 extends out of the first matching cavity 1112 through the first interval 11122 along the first radial direction c so as to be able to open and close the first hole section 1111 .

[0120] By allowing the first part 121 of the covering member 12 to extend out of the first matching cavity 1112 through the first spacer 11122, the first spacer 11122 is formed between the two first wall surfaces 11121 on the side facing the first hole section 1111, so that the covering member 12 can extend along the first direction and extend out of the matching cavity through the first spacer 11122 to open and close the first hole section 1111, which is beneficial to making the shape of the covering member 12 simpler and improving the convenience of processing and manufacturing the covering member 12.

[0121] In some embodiments of this application, please refer to Figure 6 , Figure 7 and Figure 8 , the covering member 12 slides with the first matching cavity 1112 along the first radial direction c to open and close the first hole section 1111; or, the direction of relative movement between the covering member 12 and the base body 11 is the first radial direction c, so that the second part 122 can extend into between the two first wall surfaces 11121 through the first spacer 11122, and can escape from between the two first wall surfaces 11121 through the first spacer 11122.

[0122] By making the cover part 12 slide and cooperate with the first matching cavity 1112 along the first radial direction c, that is, the relative sliding direction of the cover part 12 and the first matching cavity 1112 is parallel to the direction of the first spacer 11122, the cover part 12 opens and closes the injection hole 111 by adjusting the length of the cover part 12 extending out of the first matching cavity 1112 along the first radial direction c. The length of the cover part 12 extending out of the first matching cavity 1112 along the first radial direction c through the first spacer 11122 is relatively long, so the injection hole 111 can be closed. The length of the cover part 12 extending out of the first matching cavity 1112 along the first radial direction c through the first spacer 11122 is relatively short, or the cover part 12 is completely retracted into the first matching cavity 1112, so the injection hole 111 can be opened. The utilization rate of the first spacer 11122 is relatively high, which is conducive to simplifying the structure. By making the direction of movement of the cover part 12 relative to the base 11 the first radial direction c, the second part 122 can extend into between the two first walls 11121 through the first gap 11122, and can escape from between the two first walls 11121 through the first gap 11122. The utilization rate of the first gap 11122 is high, which is conducive to improving the simplified structure.

[0123] In some embodiments of this application, please refer to Figure 6 , Figure 7 and Figure 8 A first matching groove is formed on the inner wall of the injection hole 111 , the depth direction of the first matching groove is away from the central axis of the first hole section 1111 , and the first matching cavity 1112 is the inner cavity of the first matching groove.

[0124] In the embodiment of the present application, the opening of the first matching groove away from its bottom surface is the first gap 11122. The two axially opposite sides of the first matching groove along the first hole section 1111 are two first wall surfaces 11121. In some embodiments of the present application, the first matching groove is the first sliding groove.

[0125] By making the inner cavity of the first matching groove serve as the first matching cavity 1112, the structure of the base 11 is relatively simple, and the processing and manufacturing of the first matching cavity 1112 is relatively convenient. Moreover, it can be understood that the inner cavity of the first matching groove serves as the inner cavity of the first matching cavity 1112, and the first matching cavity 1112 is a part of the injection hole 111, and is located in the middle of the injection hole 111 in the axial direction. In this way, the cover 12 is also arranged in the injection hole 111, and the cover 12 can seal the hole sections of the injection hole 111 located on both sides of the first matching cavity 1112 in the axial direction, which is conducive to improving the sealing effect of the cover 12 on the injection hole 111.

[0126] In some embodiments of the present application, the number of the first matching cavities 1112 is at least two, and the at least two first matching cavities 1112 are arranged along the circumference of the first hole section 1111; at least two first matching cavities 1112 are matched with the same cover member 12; and / or at least two first matching cavities 1112 are respectively matched with at least two cover members 12, so that at least two cover members 12 can open and close the first hole section 1111 together. Please refer to Figure 6 , Figure 7 and Figure 8 , showing that at least two covering members 12 can jointly open and close the first hole section 1111, Fig.12 and Fig.13 The situation in which at least two first mating cavities 1112 are mated with the same cover member 12 is shown.

[0127] By providing at least two first matching cavities 1112 arranged circumferentially along the first hole section 1111, the total length of all first wall surfaces 11121 in the circumferential direction of the first hole section 1111 is increased, which is beneficial to improving the sealing effect of the cover 12 on the first hole section 1111. By making at least two first matching cavities 1112 respectively match at least two cover parts 12, the volume of a single cover part 12 can be slightly smaller, which is convenient for processing and manufacturing a single cover part 12. By making at least two first matching cavities 1112 match the same cover part 12, the cover part 12 has a higher integrity, which is beneficial to improving the sealing effect. It can be understood that, in the cover member 12, the portion supported between the two first walls 11121 will generate a relatively large force on the end surface of the first end of the first hole segment 1111, while the portion not supported between the two first walls 11121, such as the portion extending out of the first matching cavity 1112, will generate a relatively small force on the end surface of the first end of the first hole segment 1111. Of the two first walls 11121, the first first wall 11121 is formed on the end surface of the first end of the first hole segment 1111, and the second first wall 11121 is formed on the end surface of the first end of the first hole segment 1111. 121 will apply a force toward the first first wall 11121 to the portion of the cover 12 extending between the two first walls 11121, so that the portion of the cover 12 extending between the two first walls 11121 applies a larger force to the end face of the first end of the first hole section 1111, while the portion of the cover 12 not supported between the two first walls 11121, because it is not directly subjected to the abutment of the second first wall 11121, the force applied to the end face of the first end of the first hole section 1111 is relatively small. The larger the portion of the end face of the first end of the first hole section 1111 that is subjected to the stronger force generated by the cover 12, that is, the larger the area relative to the second first wall 11121, the stronger the sealing effect of the cover 12 on the first hole section 1111. There are at least two first mating cavities 1112, and at least two first mating cavities 1112 are arranged along the circumference of the first hole segment 1111. The total length of all first wall surfaces 11121 in the circumferential direction of the first hole segment 1111 is increased, which is beneficial to improving the sealing effect of the cover 12 on the first hole segment 1111.

[0128] In some embodiments of this application, please refer to Figure 6 , Figure 7 and Figure 8 Along the first radial direction c, at least two of the first matching cavities 1112 are arranged on opposite sides of the first hole section 1111 .

[0129] By arranging at least two of the first mating cavities 1112 on opposite sides of the first hole segment 1111 along the first radial direction c, the parts of the end face of the first end of the first hole segment 1111 located on both sides of the first hole segment 1111 on the first radial direction c can generate a strong force with the covering member 12, which is beneficial to improving the sealing effect of the covering member 12.

[0130] In some embodiments of this application, please refer to Figure 6 , Figure 7 and Figure 8 At least two first matching cavities 1112 respectively cooperate with at least two covering parts 12, so that at least two covering parts 12 can jointly open and close the injection hole 111; at least two first matching cavities 1112 have a spacing along the axial direction of the first hole section 1111, so that when at least two covering parts 12 can jointly close the injection hole 111, the first parts 121 of at least two covering parts 12 are stacked and distributed along the axial direction of the first hole section 1111.

[0131] By making the first parts 121 of at least two covering members 12 stacked and distributed along the axial direction of the first hole section 1111 , it is helpful to improve the sealing effect of the at least two covering members 12 on the first hole section 1111 .

[0132] Of course, in some embodiments of the present application, please refer to Fig.14 In the case where at least two covering parts 12 can jointly close the injection hole 111, the first parts 121 of the at least two covering parts 12 may not be stacked along the axial direction of the first hole section 1111, and the first parts 121 of the at least two covering parts 12 may also be flush in the axial direction of the first hole section 1111 to jointly close the first hole section 1111.

[0133] In some embodiments of this application, please refer to Figure 15 to Figure 24 , Figure 15 to Figure 24 The substrate 11 includes a substrate body 112 and a matching piece 113. Fig.15 The base 11 of the liquid injection port structure 1 is shown separately. Figures 16 to 18 The installation structure of the covering member 12 and the matching member 113 is shown from three perspectives respectively. Figures 19 to 24 Assemble the cover 12, the base body 112 and the matching piece 113 together. Figures 19 to 21 The structure of the liquid injection port structure 1 in an open state is shown from various perspectives. Fig.21 for Fig.19 The cross-section at GG in the middle, Fig.21 The injection hole 111 and the structure near the injection hole 111 are captured for display. Figures 20-24 The structure of the liquid injection port structure 1 in a closed state is shown from various perspectives. Fig.24 for Fig. 22The cross-section at GG in the middle, Fig. 22 The injection hole 111 and the structure near the injection hole 111 are intercepted for display. In this embodiment, the first matching cavity 1112 is formed on the matching piece 113, and the base body 112 is formed with a second matching cavity 11211. In the first radial direction c of the first hole segment 1111, the second matching cavity 11211 is located on one side of the first hole segment 1111, and the inner wall of the second matching cavity 11211 includes two second wall surfaces 1122 arranged opposite to each other along the axial direction of the first hole segment 1111, and the matching piece 113 is detachably supported between the two second wall surfaces 1122.

[0134] In the embodiment of the present application, the base body 112 may be integrated with the end cover or the housing 2, such as by integral casting or welding.

[0135] By making the base 11 include a detachably connected base body 112 and a matching piece 113, the cover 12 is installed on the base body 112 through the matching piece 113, which facilitates the installation of the cover 12 on the base 11, and can conveniently realize the movable connection between the cover 12 and the base 11. It can be understood that the cover 12 needs to be able to slide relative to the first matching cavity 1112 on the one hand, and needs to generate a sufficiently strong force with the first wall surface 11121 of the first matching cavity 1112 on the other hand to achieve a sealing effect, and the matching requirements are relatively high. The first matching cavity 1112 is formed on the matching piece 113, and then the matching piece 113 is detachably installed on the base body 112 integrated with the shell, which is conducive to improving the convenience of processing and manufacturing.

[0136] Of course, in some embodiments of the present application, the substrate 11 may also only include the substrate body 112 without the mating piece 113 , and the first mating cavity 1112 is formed on the substrate body 112 , and the substrate body 112 is integrally combined with the housing.

[0137] In some embodiments of this application, please refer to Fig.19 , Fig. 20 and Fig.21 The base body 112 is formed with a through hole 1121, and the through hole 1121 penetrates the base body 112 along the thickness direction of the base body 112; a second matching groove is formed on the inner wall of the through hole 1121, and the depth direction of the second matching groove deviates from the central axis of the through hole 1121, and the second matching cavity 11211 is the inner cavity of the second matching groove, and the two side surfaces of the second matching groove opposite to each other along the axial direction of the through hole 1121 are respectively two second wall surfaces 1122; the matching piece 113 extends out of the second matching groove through the opening of the second matching groove away from its own bottom surface; there is a first gap 11122 between the two first wall surfaces 11121 away from the second matching groove. The covering piece 12 extends out of the first matching cavity 1112 through the first gap 11122 so as to be able to close the through hole 1121.

[0138] In the embodiment of the present application, the through hole 1121 and the injection hole 111 have an overlapping portion, the through hole 1121 is surrounded by the base body 112, and the injection hole 111 is surrounded by the matching piece 113 and the portion of the inner wall of the through hole 1121 except the inner wall of the second matching groove, and the portion of the inner wall of the through hole 1121 except the inner wall of the second matching groove belongs to both the inner wall of the through hole 1121 and the inner wall of the injection hole 111. It can be understood that the cover 12 closes the through hole 1121, that is, closes the injection hole 111.

[0139] By making the fitting 113 extend out of the second mating groove away from the opening on its bottom surface, that is, the covering part 12 and the fitting 113 can jointly close the through hole 1121, the length of the covering part 12 in the depth direction of the second mating groove is slightly shorter, and the through hole 1121 can also be fully closed, which is beneficial to improving the convenience of processing and manufacturing of the covering part 12.

[0140] In some embodiments of the present application, along the axial direction of the first hole section 1111, the two first walls 11121 are located between the two second walls 1122. In this way, the processing and manufacturing of the fitting 113 is facilitated.

[0141] In some embodiments of this application, please refer to Fig.19 , Fig. 20 and Fig.21 Along the axial direction a of the liquid injection hole, an operating protrusion 123 is formed on the side of the cover 12 facing away from the inner cavity of the shell, and the operating protrusion 123 is used to be pushed to move the cover 12 relative to the base 11.

[0142] By forming an operating protrusion 123 on the side of the cover 12 facing away from the inner cavity of the shell, a person can push the protrusion to move the cover 12 relative to the base 11, which is conducive to improving the convenience of adjusting the relative position of the cover 12 and the base 11.

[0143] In some embodiments of this application, please refer to Fig.19 , Fig. 20 and Fig.21 , the operating protrusion 123 is located on the first part 121. In this way, the operating protrusion 123 is not easily blocked by the first matching cavity 1112, which is convenient for people to push the operating protrusion 123.

[0144] In some embodiments of the present application, a first matching groove is formed on the inner wall of the injection hole 111, and the depth direction of the first matching groove is away from the central axis of the injection hole 111. When the cover 12 closes the injection hole 111, the second part 122 of the cover 12 is located in the first matching groove and supported between the two opposite side surfaces of the first matching groove along the axial direction a of the injection hole. The first part 121 of the cover 12 extends out of the first matching groove through the opening of the first matching groove away from its bottom surface to achieve the closure of the injection hole 111. In some embodiments of the present application, please refer to Fig.12 and Fig.13 There are two first matching grooves, and the two first matching grooves are arranged opposite to each other along the radial direction of the injection hole 111. One end of the cover 12 along the depth direction of the first matching groove is slidably matched with one first matching groove along the depth direction of the first matching groove, so that the other end of the cover 12 along the depth direction of the first matching groove extends into the other first matching groove through the opening of the other first matching groove away from its bottom surface and can be removed from the other first matching groove through the opening. In some embodiments of the present application, please refer to Figure 6 , Figure 7 and Figure 8 There are two first matching grooves, which are arranged opposite to each other along the radial direction of the injection hole 111. There are two covering parts 12, which are respectively slidably matched with the corresponding first matching grooves along the depth direction of the first matching grooves, so that one end of the covering part 12 can extend out of the corresponding first matching groove through the opening of the corresponding first matching groove away from its own bottom surface, so that the two covering parts 12 can jointly close the injection hole 111.

[0145] The above are only implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A liquid injection port structure, characterized in that: include: A substrate, used to be fixed to the outer shell of the battery cell to enclose a liquid injection space with the outer shell; A liquid injection hole is formed on the base body, and the liquid injection hole penetrates the base body along the thickness direction of the base body to communicate with the liquid injection space; The cover is movably connected to the base so that the cover can move relative to the base. The direction in which the cover moves relative to the base is the extension direction of the base so that the cover can open and close the injection hole.

2. The liquid injection port structure according to claim 1, characterized in that: The cover member is slidably matched with the base body along the extension direction of the base body, so that the cover member can open and close the liquid injection hole.

3. The liquid injection port structure according to claim 2, characterized in that: The injection hole includes a first hole section, and a first slide groove is formed on the base. In a first radial direction of the first hole section, the first slide groove is located on one side of the first hole section, and the first slide groove faces the first hole section along the first radial direction; the covering member slides with the first slide groove along the first radial direction, so that the covering member can extend out of the first slide groove through the first slide groove on a side close to the injection hole to close the first hole section.

4. The liquid injection port structure according to any one of claims 1 to 3, characterized in that: The injection hole includes a first hole segment, and the base is formed with a first matching cavity. In a first radial direction of the first hole segment, the first matching cavity is located on one side of the first hole segment, and the inner wall of the first matching cavity includes two first wall surfaces arranged opposite to each other along the axial direction of the first hole segment; when the first part of the covering member closes the first hole segment, the second part of the covering member is supported between the two first wall surfaces, so that the first part applies a pre-tightening force to the end face of the first end of the first hole segment.

5. The liquid injection port structure according to claim 4, characterized in that: The second part can be slidably supported between the two first walls so that the covering member is movably connected to the base; or the direction in which the covering member moves relative to the base is parallel to the first walls so that the covering member can extend between the two first walls and can be removed from between the two first walls.

6. The liquid injection port structure according to claim 4 or 5, characterized in that: One of the two first wall surfaces is formed on an end surface of a first end of the first hole section.

7. The liquid injection port structure according to any one of claims 4 to 6, characterized in that: The two first walls have a first gap on one side facing the first hole section, and the first part of the covering member extends out of the first matching cavity through the first gap to open and close the first hole section.

8. The liquid injection port structure according to claim 7, characterized in that: The covering member slides with the first matching cavity along the first radial direction to open and close the first hole section; or, the direction of relative movement between the covering member and the base is the first radial direction, so that the second part can extend into between the two first walls through the first gap, and can escape from between the two first walls through the first gap.

9. The liquid injection port structure according to claim 7 or 8, characterized in that: A first matching groove is formed on the inner wall of the injection hole, the depth direction of the first matching groove is away from the central axis of the first hole section, and the first matching cavity is the inner cavity of the first matching groove.

10. The liquid injection port structure according to any one of claims 7 to 9, characterized in that: The number of the first mating cavities is at least two, at least two of the first mating cavities are arranged along the circumference of the first hole segment; at least two of the first mating cavities are mated with the same covering piece; and / or at least two of the first mating cavities are mated with at least two of the covering pieces respectively, so that at least two of the covering pieces can jointly open and close the first hole segment.

11. The liquid injection port structure according to claim 10, characterized in that: Along the first radial direction, at least two of the first matching cavities are arranged on opposite sides of the first hole segment.

12. The liquid injection port structure according to claim 10 or 11, characterized in that: At least two of the first mating cavities respectively cooperate with at least two of the covering parts, so that at least two of the covering parts can jointly open and close the injection hole; at least two of the first mating cavities have a spacing along the axial direction of the first hole segment, so that when at least two of the covering parts can jointly close the injection hole, the first parts of at least two of the covering parts are stacked and distributed along the axial direction of the first hole segment.

13. The liquid injection port structure according to any one of claims 4 to 12, characterized in that: The base includes a base body and a mating piece, the first mating cavity is formed on the mating piece, the base body is used to be integrally combined with the shell, the base body is formed with a second mating cavity, in the first radial direction of the first hole segment, the second mating cavity is located on one side of the first hole segment, the inner wall of the second mating cavity includes two second wall surfaces arranged opposite to each other along the axial direction of the first hole segment, and the mating piece is detachably supported between the two second wall surfaces.

14. The liquid injection port structure according to claim 13, characterized in that: The base body is formed with a through hole, and the through hole penetrates the base body along the thickness direction of the base body; a second matching groove is formed on the inner wall of the through hole, and the depth direction of the second matching groove is away from the central axis of the through hole, and the second matching cavity is the inner cavity of the second matching groove, and the two side surfaces of the second matching groove opposite to each other along the axial direction of the through hole are respectively two second wall surfaces; the matching piece extends out of the second matching groove through the opening of the second matching groove away from its own bottom surface; there is a first gap between the two sides of the first wall surfaces away from the second matching groove, and the covering piece extends out of the first matching cavity through the first gap to be able to close the through hole.

15. The liquid injection port structure according to any one of claims 1 to 14, characterized in that: An operating protrusion is formed on the side surface of the cover member facing away from the inner cavity of the shell along the axial direction of the liquid injection hole, and the operating protrusion is used to be pushed so that the cover member moves relative to the base.

16. A battery cell, characterized in that: include: shell; The liquid injection port structure according to any one of claims 1 to 15, wherein the base is fixed to the shell to enclose a liquid injection space with the shell; The electrolyte is filled in the liquid injection space.

17. A battery, characterized in that: The battery cell according to claim 16 is included, wherein the number of the battery cells is at least two, and at least two of the battery cells are distributed in an array and are connected in series, in parallel or in hybrid connection through a busbar component.

18. An electrical equipment, characterized in that: include: Electricity-consuming entity; The battery as claimed in claim 17 is used to supply power to the power-consuming entity.

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