Liquid injection component, liquid injection device and battery production equipment

Abstract

The utility model provides a liquid injection component, a liquid injection device and battery production equipment. The liquid injection component is used for injecting electrolyte into the single battery, the liquid injection component comprises a base body and a convex part, the base body comprises a first end face and a second end face which are opposite in the first direction, the first end face is provided with an input port, the second end face is provided with an output port, and a fluid channel is formed in the base body and communicated with the input port and the output port. The protruding part protrudes out of the second end face and surrounds the output port. According to the invention, the sealing performance of the liquid injection component can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a liquid injection component, a liquid injection device and a battery production equipment. Background Art

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the preparation of batteries, a liquid injection component is usually used to inject liquid into the battery cell. During the process of injecting electrolyte into the battery cell, the liquid injection component is prone to leakage, thus affecting the product quality of the battery. Therefore, how to effectively improve the sealing performance of the liquid injection component is an urgent problem to be solved in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a liquid injection component, a liquid injection device and a battery production equipment, which can improve the sealing performance of the liquid injection component.

[0005] In the first aspect, the embodiment of the present application provides a liquid injection component, which is used to inject electrolyte into a battery cell, and includes a base and a convex portion, the base includes a first end face and a second end face opposite to each other along a first direction, the first end face is provided with an input port, the second end face is provided with an output port, a fluid channel is opened inside the base, and the fluid channel is connected to the input port and the output port. The convex portion protrudes from the second end face and surrounds the output port.

[0006] The above technical solution can improve the sealing performance of the liquid injection component by providing the convex portion, so as to reduce the risk of electrolyte leakage during the liquid injection process of the battery cell.

[0007] In some embodiments of the first aspect, the protrusion includes a first boss and a second boss, the first boss surrounds the output port, and the second boss surrounds the first boss.

[0008] The above technical solution can form two sealing structures around the output port and the injection hole during the injection process by providing the first boss and the second boss, thereby further improving the sealing performance of the injection component.

[0009] In some embodiments of the first aspect, a first angle a formed between the inner wall surface of the second boss and the first end surface and directed toward the first boss is an obtuse angle.

[0010] The above technical solution enables the second boss to easily deform or have a deformation tendency in a direction perpendicular to the first direction and away from the output port after being subjected to an extrusion force in the first direction, thereby increasing the area of ​​the sealing surface formed by the second boss and improving the sealing effect of the second boss.

[0011] In some embodiments of the first aspect, a cross section of the second boss perpendicular to the first direction gradually decreases along the first direction and away from the second end surface.

[0012] The second boss can be more easily deformed or have a tendency to deform, so that a sealing structure is more easily formed between the second boss and the wall body, thereby improving the reliability of the second boss.

[0013] In some embodiments of the first aspect, along the first direction, a first dimension h1 of the first boss in the first direction is greater than a second dimension h2 of the second boss in the first direction.

[0014] The above technical solution specifically designs the structural dimensions of the first boss and the second boss according to the risk of electrolyte leakage at different positions of the liquid injection component, which can further improve the sealing performance of the liquid injection component.

[0015] In some embodiments of the first aspect, the first dimension h1 satisfies the relationship: 0.5 mm≤h1≤10 mm; and / or the second dimension h2 satisfies the relationship: 0.2 mm≤h2≤8 mm.

[0016] The above technical solution can take into account both the sealing performance and applicability of the liquid injection component.

[0017] In some embodiments of the first aspect, the first dimension h1 satisfies the relationship: 1.6 mm≤h1≤3 mm; and / or the second dimension h2 satisfies the relationship: 1 mm≤h2≤2 mm.

[0018] The above technical solution can further improve the balance between the sealing performance and applicability of the liquid injection component.

[0019] In some embodiments of the first aspect, the convex portion is made of an elastic material, which can further improve the sealing performance of the liquid injection component.

[0020] In some embodiments of the first aspect, the fluid channel includes a first segment and a second segment distributed along a first direction, the first segment is connected to the input port, and the second segment is connected to the output port. In the first direction, a projection of the second segment is located within a projection of the first segment.

[0021] In the above technical solution, when the electrolyte enters the second section with a smaller diameter from the first section with a larger diameter, the flow rate of the electrolyte will increase, thereby improving the injection efficiency of the injection component.

[0022] In some embodiments of the first aspect, the fluid channel further comprises a third section, the third section is connected between the first section and the second section, and the dimension of the third section in the second direction gradually decreases from the first section to the second section, and the first direction intersects with the second direction.

[0023] The above technical solution sets the third section, and the electrolyte will pass through the transition of the third section when entering the second section with a smaller path size from the first section with a larger path size. This can reduce the sudden change of the flow cross-section of the electrolyte during the flow in the fluid channel, thereby reducing the risk of turbulence, vibration and noise, and is conducive to improving the reliability of the liquid injection components.

[0024] In some embodiments of the first aspect, the substrate includes a first portion and a second portion distributed along a first direction, the first end surface is disposed on the first portion, and the second end surface is disposed on the second portion. In the first direction, a projection of the second portion is located within a projection of the first portion.

[0025] The above technical solution can reduce the size of the output end of the liquid injection component, thereby reducing the overall volume of the liquid injection component, thereby reducing the requirements of the liquid injection component for the working space and improving the adaptability of the liquid injection component.

[0026] In some embodiments of the first aspect, the substrate further comprises a third portion connected between the first portion and the second portion. In the direction from the first portion to the second portion, the size of the third portion in the second direction gradually decreases, and the first direction intersects the second direction.

[0027] The above technical solution can reduce the size of the misalignment at the junction of the first part and the second part by providing the third part, which is beneficial to improving the consistency of the liquid injection component.

[0028] In some embodiments of the first aspect, the liquid injection component further includes a flange member, which surrounds the outer side of the base body and is arranged close to the first end surface.

[0029] The above technical solution can increase the contact area between the liquid injection component and the external liquid supply device by providing a flange, so as to improve the stability of the connection between the liquid injection component and the external liquid supply device, thereby improving the reliability of the liquid injection device.

[0030] In some embodiments of the first aspect, the output port includes a plurality of openings, and the plurality of openings are spaced apart.

[0031] On the one hand, multiple openings are conducive to increasing the equivalent aperture of the output port, which can increase the flow rate of the electrolyte when it is output through the multiple openings, thereby improving the injection efficiency of the injection component; on the other hand, the closed area between the multiple openings can also prevent debris in the external environment from entering the fluid channel, thereby reducing the risk of debris in the external environment blocking the fluid channel, so as to improve the reliability of the injection component.

[0032] In some embodiments of the first aspect, the plurality of openings include a first opening and a second opening, the first opening is farther away from the protrusion than the second opening, and a diameter of the second opening is smaller than a diameter of the first opening.

[0033] The above technical solution enables most of the electrolyte to be output from the central area of ​​the first end face by arranging the first opening with a larger diameter close to the central area of ​​the first end face and arranging the second opening with a smaller diameter relatively to the central area away from the first end face, thereby further reducing the risk of electrolyte leakage.

[0034] In some embodiments of the first aspect, there are multiple second openings, and the multiple second openings are arranged around the first opening, which is beneficial to improving the uniformity of electrolyte output.

[0035] In some embodiments of the first aspect, the liquid injection component further includes a blocking member, the blocking member is provided with a through hole extending along the first direction, and the blocking member is plugged into the output port.

[0036] The above technical solution provides a blocking member, which can reduce the diameter of the output port, thereby reducing the risk of debris in the external environment blocking the fluid channel, thereby improving the reliability of the liquid injection component.

[0037] In some embodiments of the first aspect, there are multiple through holes, and the multiple through holes are spaced apart and distributed along the second direction, and the first direction intersects the second direction.

[0038] By providing a plurality of through holes, the equivalent aperture of the blocking member can be increased, so as to increase the flow rate of the electrolyte when it is output through the plurality of through holes, thereby improving the injection efficiency of the injection component.

[0039] In some embodiments of the first aspect, a surface of the blocking member facing away from the first end surface is flush with the second end surface.

[0040] On the one hand, it is beneficial to reduce the overall volume of the injection component, so as to reduce the requirements of the injection component for the working space and improve the adaptability of the injection component; on the other hand, it can also improve the appearance smoothness and consistency of the injection component, which is beneficial to improving product quality.

[0041] In some embodiments of the first aspect, the battery cell includes a first wall, the first wall is provided with a liquid injection hole and an elastic valve, the elastic valve is provided at the liquid injection hole, a first end portion of the elastic valve in a first direction protrudes from an outer surface of the first wall, and the elastic valve is configured to be opened and connect the inside and the outside of the battery cell when the first end portion is squeezed. The second end surface is used to squeeze the first end portion, and the convex portion is used to abut against the first wall.

[0042] In the above technical solution, during the liquid injection process, the convex part will first form a seal around the outlet and the elastic valve, and then the liquid injection component will squeeze the elastic valve to open the valve; after the liquid injection is completed, the elastic valve can be closed first, and then the sealing structure around the outlet and the elastic valve can be removed. On the one hand, the battery cell can always maintain a vacuum state inside the battery cell during the entire liquid injection process, thereby improving the liquid injection effect; on the other hand, the sealing structure formed between the convex part and the first wall can reduce the risk of electrolyte leakage and contamination of the battery cell, thereby improving product quality.

[0043] In a second aspect, the present application provides a liquid injection device, which includes a liquid supply device, a conveying component and the liquid injection component provided by any embodiment of the first aspect, the liquid supply device is used to provide electrolyte, the conveying component is connected to the liquid supply device and used to convey electrolyte, and the input port of the liquid injection component is connected to the conveying component.

[0044] In a third aspect, the present application provides an electrical device, which includes the liquid injection device provided by any embodiment of the second aspect.

[0045] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0047] Figure 1 A schematic structural diagram of a liquid injection component provided in some embodiments of the present application;

[0048] Figure 2 for Figure 1 A schematic cross-sectional structure diagram of the liquid injection component shown;

[0049] Figure 3 for Figure 2 A schematic diagram of the local enlarged structure at F;

[0050] Figure 4 A schematic structural diagram of another liquid injection component provided in some embodiments of the present application;

[0051] Figure 5 for Figure 4 A schematic cross-sectional structure diagram of the liquid injection component shown;

[0052] Figure 6 A schematic structural diagram of another liquid injection component provided in some embodiments of the present application;

[0053] Figure 7 for Figure 6 The structural schematic diagram of the liquid injection component along the first direction shown;

[0054] Figure 8 for Figure 7 Schematic diagram of the cross-section structure along AA;

[0055] Fig. 9 A schematic structural diagram of another liquid injection component provided in some embodiments of the present application;

[0056] Fig.10 for Fig. 9 The structural schematic diagram of the liquid injection component along the first direction shown;

[0057] Fig.11 for Fig.10 Schematic diagram of the cross-section structure along BB;

[0058] Fig.12 A schematic structural diagram of a first state of cooperation between a liquid injection component and a battery cell provided in some embodiments of the present application;

[0059] Fig.13 for Fig.12 A schematic cross-sectional structure diagram of a first state in which the liquid injection component cooperates with the battery cell;

[0060] Fig.14 for Fig.13 A schematic diagram of the local enlarged structure at G;

[0061] Fig.15 A schematic structural diagram of a second state of cooperation between a liquid injection component and a battery cell provided in some embodiments of the present application;

[0062] Fig.16 for Fig.15 A schematic cross-sectional structure diagram of a second state in which the liquid injection component cooperates with the battery cell;

[0063] Fig.17 for Fig.16 Schematic diagram of the local enlarged structure at H.

[0064] The reference numerals in the specific implementation manner are as follows:

[0065] 100, liquid injection component; 200, first wall; 210, elastic valve; 211, first end;

[0066] 10. substrate; 101. first part; 102. second part; 103. third part; 11. first end surface; 111. input port; 12. second end surface; 121. output port; 13. fluid channel; 131. first section; 132. second section; 133. third section;

[0067] 20. Projection; 21. First boss; 22. Second boss;

[0068] 30. Flange; 40. Opening; 41. First opening; 42. Second opening; 50. Blocking member; 51. Through hole; X. First direction; Y. Second direction. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0070] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application 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 specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0071] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0072] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0074] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0075] The term "plurality" used in the present application refers to two or more (including two).

[0076] In the present application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; meanwhile, "vertical" includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0077] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0078] The battery mentioned in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0079] In some embodiments, the battery may be a battery module; when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0080] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0081] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0082] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0083] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0084] In the preparation of batteries, a liquid injection component is usually used to inject liquid into the battery cell. During the process of injecting electrolyte into the battery cell, the liquid injection component is prone to leakage, thus affecting the product quality of the battery. Therefore, how to effectively improve the sealing performance of the liquid injection component is an urgent problem to be solved in battery technology.

[0085] Based on the above considerations, the present application designs a liquid injection component, which is used to inject electrolyte into a battery cell. The liquid injection component includes a base and a convex portion. The base includes a first end face and a second end face opposite to each other along a first direction. The first end face is provided with an input port, and the second end face is provided with an output port. A fluid channel is provided inside the base, and the fluid channel is connected to the input port and the output port. The convex portion protrudes from the second end face and surrounds the output port.

[0086] During the liquid injection process, before the outlet of the liquid injection component is connected to the liquid injection hole on the battery cell, as the liquid injection component gradually approaches the liquid injection hole in the first direction, the convex portion will first contact the wall around the liquid injection hole of the battery cell to form a seal around the outlet and the liquid injection hole, and then the outlet will be connected to the liquid injection hole to perform the liquid injection work. In this way, the above technical solution can improve the sealing performance of the liquid injection component to reduce the risk of electrolyte leakage during the liquid injection process of the battery cell.

[0087] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0088] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle 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, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0089] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the batteries and electrical equipment described above, but can also be applied to all batteries including battery boxes and electrical equipment using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0090] Figure 1 This is a schematic diagram of the structure of a liquid injection component provided in some embodiments of the present application. Figure 2 for Figure 1 The cross-sectional structural schematic diagram of the liquid injection component is shown.

[0091] like Figure 1 to Figure 2 As shown, the embodiment of the present application provides a liquid injection component 100, which is used to inject electrolyte into a battery cell. The liquid injection component 100 includes a base 10 and a convex portion 20. The base 10 includes a first end face 11 and a second end face 12 opposite to each other along a first direction X. The first end face 11 is provided with an input port 111, and the second end face 12 is provided with an output port 121. A fluid channel 13 is provided inside the base 10, and the fluid channel 13 is connected to the input port 111 and the output port 121. The convex portion 20 protrudes from the second end face 12 and surrounds the output port 121.

[0092] Exemplarily, the first end surface 11 of the base 10 refers to the input end of the liquid injection component 100, and the second end surface 12 of the base 10 refers to the output end of the liquid injection component 100. The input port 111 is used to receive electrolyte provided by an external liquid supply device, the fluid channel 13 is used to transport the electrolyte, and the output port 121 is used to dock with the liquid injection hole of the battery cell to inject the electrolyte into the interior of the battery cell through the liquid injection hole.

[0093] Optionally, the substrate 10 may be but is not limited to being made of metal or non-metal materials. For example, the metal material may be copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy or stainless steel, and the non-metal material may be polyethylene, polypropylene, polyvinyl chloride or wood, etc.

[0094] The convex portion 20 is used to seal the output port 121. For example, during the liquid injection process, before the output port 121 of the liquid injection component 100 is docked with the liquid injection hole on the battery cell, as the liquid injection component 100 gradually approaches the liquid injection hole along the first direction X, the convex portion 20 will first abut against the wall around the liquid injection hole of the battery cell to form a seal around the output port 121 and the liquid injection hole, and then the output port 121 will be docked with the liquid injection hole to perform the liquid injection work.

[0095] Optionally, the protrusion 20 may be detachably connected to the base 10, or may be integrally provided on the base 10, wherein the protrusion 20 may be directly connected to the base 10, or may be restricted on the base 10 by other components. As an example, the connection method between the protrusion 20 and the base 10 may be, but is not limited to, bolt connection, welding, riveting, clamping or bonding, etc.

[0096] As an example, the protrusion 20 and the base 10 are an integrally formed structure. On the one hand, there is no need to connect the protrusion 20 and the base 10 through an additional connection process, which simplifies the manufacturing process. At the same time, compared with connecting the protrusion 20 and the base 10 through an additional connection process, the protrusion 20 and the base 10 in an integral structure have a higher connection firmness.

[0097] Optionally, the protrusion 20 may be, but is not limited to, made of metal or non-metal material, for example, the metal material may be copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy or stainless steel, etc., and the non-metal material may be polyethylene, polypropylene, polyvinyl chloride or wood, etc. As an example, the protrusion 20 and the substrate 10 may be made of the same material to simplify the preparation process and help reduce costs.

[0098] Optionally, the protrusion 20 is made of a material with good chemical stability to reduce the risk of chemical reaction with the electrolyte to affect the quality of the electrolyte.

[0099] In the first direction X, the projection shape of the boss on the second end surface 12 may be, but is not limited to, a circular ring, a square ring, a triangular ring, an elliptical ring, or the like.

[0100] The above technical solution can improve the sealing performance of the liquid injection component 100 by providing the convex portion 20, so as to reduce the risk of electrolyte leakage during the liquid injection process of the battery cell.

[0101] In some embodiments, the protrusion 20 includes a first boss 21 and a second boss 22 . The first boss 21 surrounds the output port 121 , and the second boss 22 surrounds the first boss 21 .

[0102] Exemplarily, the first boss 21 and the second boss 22 are both used to seal the output port 121. The first boss 21 is arranged closer to the output port 121 relative to the second boss 22 to form a first sealing structure; the second boss 22 is arranged farther from the output port 121 relative to the first boss 21 to form a second sealing structure.

[0103] In the first direction X, the projection shape of the first boss 21 on the second end surface 12 and the projection shape of the second boss 22 on the second end surface 12 may be the same or different. As an example, the projection shape of the first boss 21 on the second end surface 12 and the projection shape of the second boss 22 on the second end surface 12 are both circular rings; as another example, the projection shape of the first boss 21 on the second end surface 12 is a circular ring, and the projection shape of the second boss 22 on the second end surface 12 is a square ring.

[0104] The above technical solution can form two sealing structures around the output port 121 and the injection hole by providing the first boss 21 and the second boss 22 during the injection process, thereby further improving the sealing performance of the injection component 100.

[0105] Figure 3 for Figure 2 Schematic diagram of the local enlarged structure at F.

[0106] Continue to refer Figure 3 In some embodiments, a first angle a formed between the inner wall surface of the second boss 22 and the first end surface 11 and pointing toward the first boss 21 is an obtuse angle.

[0107] The first angle a is an obtuse angle, in other words, the first angle a satisfies the relationship: 90°<a<180°. As an example, the first angle a can be but is not limited to 95°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, 175°, etc.

[0108] Exemplarily, after the second boss 22 abuts against the wall around the injection hole of the battery cell, as the injection component 100 gradually approaches the injection hole along the first direction X, the second boss 22 will be subjected to the squeezing force from the wall along the first direction X. When the first angle a formed between the inner wall surface of the second boss 22 and the first end surface 11 and directed toward the first boss 21 is an obtuse angle, the second boss 22 is subjected to the component force of the squeezing force from the wall along the first direction X in a direction perpendicular to the first direction X and away from the output port 121. This component force can cause the second boss 22 to deform or have a tendency to deform in a direction perpendicular to the first direction X and away from the output port 121, thereby increasing the effective contact area between the second boss 22 and the wall, that is, the area of ​​the sealing surface formed by the second boss 22, so as to improve the sealing effect of the second boss 22.

[0109] The above technical solution enables the second boss 22 to easily deform or have a deformation tendency in a direction perpendicular to the first direction X and away from the output port 121 after being subjected to an extrusion force in the first direction X, thereby increasing the area of ​​the sealing surface formed by the second boss 22 and improving the sealing effect of the second boss 22.

[0110] Further, the first angle a satisfies the relationship: 120°≤a≤150°, so as to further improve the sealing effect of the second boss 22. As an example, the first angle a can be but is not limited to 120°, 125°, 130°, 135°, 140°, 145, 150°, etc.

[0111] In some embodiments, a cross section of the second boss 22 perpendicular to the first direction X gradually decreases along the first direction X and away from the second end surface 12 . In other words, along the first direction X and away from the second end surface 12 , the thickness of the second boss 22 gradually decreases.

[0112] In this way, after the second boss 22 abuts against the wall around the injection hole of the battery cell, as the injection component 100 gradually approaches the injection hole along the first direction X, the second boss 22 will be more likely to deform or have a tendency to deform when subjected to the squeezing force from the wall along the first direction X, thereby making it easier to form a sealing structure between the second boss 22 and the wall, thereby improving the reliability of the second boss 22.

[0113] In some embodiments, along the first direction X, a first dimension h1 of the first boss 21 in the first direction X is greater than a second dimension h2 of the second boss 22 in the first direction X.

[0114] Illustratively, during the liquid injection process, before the output port 121 of the liquid injection component 100 is connected to the liquid injection hole on the battery cell, as the liquid injection component 100 gradually approaches the liquid injection hole along the first direction X, the first boss 21 will first abut against the wall around the liquid injection hole of the battery cell to form a first sealing structure around the output port 121 and the liquid injection hole; as the liquid injection component 100 continues to gradually approach the liquid injection hole along the first direction X, the second boss 22 will again abut against the wall around the liquid injection hole of the battery cell to form a second sealing structure around the output port 121 and the liquid injection hole. It should be noted that while the second boss 22 forms the second sealing structure around the output port 121 and the liquid injection hole, as the liquid injection component 100 gradually approaches the liquid injection hole along the first direction X, the first boss 21 will abut against the wall around the liquid injection hole of the battery cell more and more tightly, so that the sealing effect of the first sealing structure formed by the first boss 21 around the output port 121 and the liquid injection hole will be better.

[0115] It can be understood that the first boss 21 is arranged closer to the output port 121 relative to the second boss 22, and the risk of electrolyte leakage at the position of the first sealing structure formed by the first boss 21 around the output port 121 and the injection hole is greater than the risk of electrolyte leakage at the position of the second boss 22 forming the second sealing structure around the output port 121 and the injection hole.

[0116] In this way, the above technical solution specifically designs the structural dimensions of the first boss 21 and the second boss 22 according to the risk of electrolyte leakage at different positions of the liquid injection component 100, which can further improve the sealing performance of the liquid injection component 100.

[0117] In some embodiments, the first size h1 satisfies the relationship: 0.5 mm≤h1≤10 mm.

[0118] As an example, the first size h1 can be but is not limited to 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc.

[0119] It is understandable that the larger the first dimension h1 is, the tighter the first boss 21 will be in contact with the wall around the injection hole of the battery cell when the output port 121 of the injection component 100 is docked with the injection hole on the battery cell, so that the sealing effect of the first sealing structure formed by the first boss 21 around the output port 121 and the injection hole will be better, and the sealing performance of the injection component 100 will be higher. At the same time, the larger the first dimension h1 is, the larger the overall volume of the injection component 100 is, and the higher the requirements of the injection component 100 for the working space during the injection process, and the lower the adaptability of the injection component 100 is. Correspondingly, the smaller the first dimension h1 is, the lower the sealing performance of the injection component 100 is, and the higher the applicability is.

[0120] In this way, the above technical solution can take into account both the sealing performance and applicability of the liquid injection component 100 by setting the first size h1 within the above range.

[0121] Furthermore, the first size h1 satisfies the relationship: 1.6 mm≤h1≤3 mm, which can further improve the balance between the sealing performance and applicability of the liquid injection component 100 .

[0122] As an example, the first size h1 can be but is not limited to 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, etc.

[0123] In some embodiments, the second size h2 satisfies the relationship: 0.2 mm≤h2≤8 mm.

[0124] As an example, the second size h2 can be but is not limited to 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc.

[0125] It is understandable that the larger the second dimension h2 is, the tighter the second boss 22 will be in contact with the wall around the injection hole of the battery cell when the output port 121 of the injection component 100 is docked with the injection hole on the battery cell, so that the sealing effect of the first sealing structure formed by the second boss 22 around the output port 121 and the injection hole will be better, and the sealing performance of the injection component 100 will be higher. At the same time, the larger the second dimension h2 is, the larger the overall volume of the injection component 100 is, and the higher the requirements of the injection component 100 for the working space during the injection process, and the lower the adaptability of the injection component 100 is. Correspondingly, the smaller the second dimension h2 is, the lower the sealing performance of the injection component 100 is, and the higher the applicability is.

[0126] In this way, the above technical solution can take into account both the sealing performance and applicability of the liquid injection component 100 by setting the second size h2 within the above range.

[0127] Furthermore, the second size h2 satisfies the relationship: 1 mm≤h2≤2 mm, which can further improve the balance between the sealing performance and applicability of the liquid injection component 100.

[0128] As an example, the second size h2 may be, but is not limited to, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc.

[0129] In some embodiments, the protrusion 20 is made of an elastic material.

[0130] Exemplarily, after the second boss 22 abuts against the wall around the injection hole of the battery cell, as the injection component 100 gradually approaches the injection hole along the first direction X, the second boss 22 will be subjected to the squeezing force from the wall along the first direction X, and the protrusion 20 made of elastic material can be deformed quickly. At the same time, the protrusion 20 can also undergo adaptive elastic deformation according to the shape of the wall of the battery cell to improve the tightness of the fit between the protrusion 20 and the wall of the battery cell, thereby further improving the sealing performance of the injection component 100.

[0131] Optionally, the elastic material may be but is not limited to rubber, silicone rubber, polyethylene, polyurethane, polyvinyl chloride or rubber foam, etc.

[0132] Figure 4 This is a schematic diagram of the structure of another liquid injection component provided in some embodiments of the present application. Figure 5 for Figure 4 The cross-sectional structural schematic diagram of the liquid injection component is shown.

[0133] Continue to refer Figures 4 to 5In some embodiments, the fluid channel 13 includes a first section 131 and a second section 132 distributed along the first direction X, the first section 131 is connected to the input port 111, and the second section 132 is connected to the output port 121. In the first direction X, the projection of the second section 132 is located within the projection of the first section 131.

[0134] For example, the first section 131 can be understood as an input section, and the second section 132 can be understood as an output section. The electrolyte enters the input section through the input port 111, then enters the output section from the input section, and finally enters the interior of the battery cell from the output port 121. In the first direction X, the projection of the second section 132 is located within the projection of the first section 131, which means that the diameter of the second section 132 is smaller than the diameter of the first section 131.

[0135] Optionally, the projection shape of the first segment 131 in the first direction X may be, but is not limited to, a circle, a rectangle, a triangle, a trapezoid or an ellipse, etc. The projection shape of the second segment 132 in the first direction X may be, but is not limited to, a circle, a rectangle, a triangle, a trapezoid or an ellipse, etc.

[0136] The projection shape of the first segment 131 in the first direction X and the projection shape of the second segment 132 in the first direction X may be the same or different. As an example, the projection shape of the first segment 131 in the first direction X and the projection shape of the second segment 132 in the first direction X are both circular; as another example, the projection shape of the first segment 131 in the first direction X is circular, and the projection shape of the second segment 132 in the first direction X is rectangular.

[0137] In the above technical solution, when the electrolyte enters the second section 132 with a smaller diameter from the first section 131 with a larger diameter, the flow rate of the electrolyte will increase, thereby improving the injection efficiency of the injection component 100.

[0138] In some embodiments, the fluid channel 13 further includes a third section 133, which is connected between the first section 131 and the second section 132. In the direction from the first section 131 to the second section 132, the size of the third section 133 in the second direction Y gradually decreases, and the first direction X intersects with the second direction Y.

[0139] Exemplarily, the third section 133 can be understood as a transition section. In the direction from the first section 131 to the second section 132, the size of the third section 133 in the second direction Y gradually decreases, which means that the diameter size of the third section 133 gradually decreases in the direction from the first section 131 to the second section 132.

[0140] It is understandable that when the electrolyte enters the second section 132 with a smaller diameter from the first section 131 with a larger diameter, the flow cross-section of the electrolyte will undergo a sudden change at the junction of the first section 131 and the second section 132. On the one hand, this may cause the electrolyte to change from laminar flow to turbulent flow, thereby affecting the injection effect of the injection component 100; on the other hand, the increase in the electrolyte flow rate and the possible turbulence will increase the vibration and noise of the injection component 100.

[0141] In this way, the above technical solution sets the third section 133. When the electrolyte enters the second section 132 with a smaller path size from the first section 131 with a larger path size, it will pass through the transition of the third section 133, which can reduce the sudden change of the flow cross-section of the electrolyte during the flow in the fluid channel 13, thereby reducing the risk of turbulence, vibration and noise, and is beneficial to improving the reliability of the liquid injection component 100.

[0142] In some embodiments, the substrate 10 includes a first portion 101 and a second portion 102 distributed along a first direction X, the first end surface 11 is disposed on the first portion 101, and the second end surface 12 is disposed on the second portion 102. In the first direction X, the projection of the second portion 102 is located within the projection of the first portion 101.

[0143] Exemplarily, the first part 101 can be understood as an input end, and the second part 102 can be understood as an output end. In the first direction X, the projection of the second part 102 is located within the projection of the first part 101, which means that the size of the second part 102 in the direction perpendicular to the first direction X is smaller than the size of the first part 101 in the direction perpendicular to the first direction X.

[0144] Optionally, the projection shape of the first part 101 in the first direction X may be but not limited to a circular ring, a square ring, a triangular ring or an elliptical ring, etc. The projection shape of the second part 102 in the first direction X may be but not limited to a circular ring, a square ring, a triangular ring or an elliptical ring, etc.

[0145] The projection shape of the first segment 131 in the first direction X and the projection shape of the second segment 132 in the first direction X may be the same or different. As an example, the projection shape of the first segment 131 in the first direction X and the projection shape of the second segment 132 in the first direction X are both circular rings; as another example, the projection shape of the first segment 131 in the first direction X is a circular ring, and the projection shape of the second segment 132 in the first direction X is a square ring.

[0146] Optionally, the first part 101 and the second part 102 are integrally formed. On the one hand, there is no need to connect the protrusion 20 and the base 10 through an additional connection process, which simplifies the manufacturing process. At the same time, compared with connecting the first part 101 and the second part 102 through an additional connection process, the first part 101 and the second part 102 in an integral structure have a higher connection firmness.

[0147] The above technical solution can reduce the size of the output end of the liquid injection component 100 , thereby reducing the overall volume of the liquid injection component 100 , thereby reducing the requirements of the liquid injection component 100 on the working space and improving the adaptability of the liquid injection component 100 .

[0148] In some embodiments, the substrate 10 further includes a third portion 103 connected between the first portion 101 and the second portion 102. In the direction from the first portion 101 to the second portion 102, the size of the third portion 103 in the second direction Y gradually decreases, and the first direction X intersects with the second direction Y.

[0149] Exemplarily, the third portion 103 can be understood as a transition portion. In the direction from the first portion 101 to the second portion 102, the size of the third portion 103 in the second direction Y gradually decreases, which can be understood as the outer diameter of the third portion 103 gradually decreases.

[0150] The above technical solution can reduce the misalignment between the first part 101 and the second part 102 by providing the third part 103 , which is beneficial to improving the consistency of the liquid injection component 100 .

[0151] Optionally, the first direction X is perpendicular to the second direction Y.

[0152] In some embodiments, the liquid injection component 100 further includes a flange 30 , which surrounds the outer side of the base 10 and is disposed close to the first end surface 11 .

[0153] Exemplarily, the flange 30 may be detachably connected to the base 10, or may be integrally provided on the base 10. The flange 30 may be directly connected to the base 10, or may be restricted to the base 10 by other components. As an example, the connection method between the flange 30 and the base 10 may be, but is not limited to, bolt connection, welding, riveting, clamping or bonding.

[0154] Optionally, the flange 30 and the base 10 may be an integrally formed structure. On the one hand, there is no need to connect the flange 30 and the base 10 through an additional connection process, which simplifies the manufacturing process. At the same time, compared with connecting the flange 30 and the base 10 through an additional connection process, the integrally formed flange 30 and the base 10 have a higher connection firmness.

[0155] Optionally, the flange 30 may be made of, but is not limited to, a metal or non-metal material, for example, the metal material may be copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy or stainless steel, etc., and the non-metal material may be polyethylene, polypropylene, polyvinyl chloride or wood, etc. As an example, the flange 30 and the base 10 may be made of the same material to simplify the preparation process and help reduce costs.

[0156] The above technical solution can increase the contact area between the liquid injection component 100 and the external liquid supply device by providing the flange 30, so as to improve the stability of the connection between the liquid injection component 100 and the external liquid supply device, thereby improving the reliability of the liquid injection device.

[0157] Figure 6 This is a schematic diagram of the structure of another liquid injection component provided in some embodiments of the present application. Figure 7 for Figure 6 The schematic diagram of the structure of the liquid injection component along the first direction X is shown, Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure along AA.

[0158] Continue to refer Figures 6 to 8 In some embodiments, the output port 121 includes a plurality of openings 40, and the plurality of openings 40 are arranged at intervals. For example, the number of the openings 40 may be, but is not limited to, two, three, four or more.

[0159] By setting the output port 121 as a plurality of openings 40, on the one hand, the plurality of openings 40 are conducive to increasing the equivalent aperture of the output port 121, and can increase the flow rate of the electrolyte when it is output through the plurality of openings 40, thereby improving the injection efficiency of the injection component 100; on the other hand, the closed area between the plurality of openings 40 can also prevent debris in the external environment from entering the fluid channel 13, thereby reducing the risk of debris in the external environment blocking the fluid channel 13, so as to improve the reliability of the injection component 100.

[0160] In some embodiments, the plurality of openings 40 include a first opening 41 and a second opening 42 . The first opening 41 is farther away from the protrusion 20 than the second opening 42 . The diameter of the second opening 42 is smaller than that of the first opening 41 .

[0161] Exemplarily, the first opening 41 is farther away from the protrusion 20 than the second opening 42 , that is, the first opening 41 is disposed close to the central area of ​​the first end surface 11 , and the second opening 42 is disposed relatively away from the central area of ​​the first end surface 11 .

[0162] Optionally, the projection shape of the first opening 41 in the first direction X may be, but is not limited to, a circle, a rectangle, a triangle, a trapezoid or an ellipse, etc. The projection shape of the second opening 42 in the first direction X may be, but is not limited to, a circle, a rectangle, a triangle, a trapezoid or an ellipse, etc.

[0163] The projection shape of the first opening 41 in the first direction X and the projection shape of the second opening 42 in the first direction X may be the same or different. As an example, the projection shape of the first opening 41 in the first direction X and the projection shape of the second opening 42 in the first direction X are both circular; as another example, the projection shape of the first opening 41 in the first direction X is circular, and the projection shape of the second opening 42 in the first direction X is rectangular.

[0164] The above technical solution enables most of the electrolyte to be output from the central area of ​​the first end face 11, thereby further reducing the risk of electrolyte leakage by arranging the first opening 41 with a larger diameter close to the central area of ​​the first end face 11 and arranging the second opening 42 with a smaller diameter relatively away from the central area of ​​the first end face 11.

[0165] In some embodiments, there are multiple second openings 42 , and the multiple second openings 42 are arranged around the first opening 41 , which is beneficial to improving the uniformity of electrolyte output.

[0166] For example, the number of the second openings 42 may be, but is not limited to, two, three, four or more.

[0167] Fig. 9 This is a schematic diagram of the structure of another liquid injection component provided in some embodiments of the present application. Fig.10 for Fig. 9 The schematic diagram of the structure of the liquid injection component along the first direction shown, Fig.11 for Fig.10 Schematic diagram of the cross-sectional structure along BB.

[0168] Continue to refer Figures 9 to 11 In some embodiments, the liquid injection component 100 further includes a blocking member 50 , the blocking member 50 is provided with a through hole 51 extending along the first direction X, and the blocking member 50 is plugged into the output port 121 .

[0169] Exemplarily, the blocking member 50 is plugged into the output port 121, and the through hole 51 of the blocking member 50 assumes the function of outputting the electrolyte from the output port 121. Specifically, the electrolyte enters the fluid channel 13 through the input port 111, and then enters the interior of the battery cell from the through hole 51 of the blocking member 50. The blocking member 50 can be detachably connected to the substrate 10, or it can be integrally provided on the substrate 10. The blocking member 50 can be directly connected to the substrate 10, or it can be restricted to the substrate 10 by other components. As an example, the connection method between the blocking member 50 and the substrate 10 can be, but is not limited to, bolt connection, welding, riveting, clamping or bonding, etc.

[0170] Optionally, the blocking member 50 and the base 10 may be an integrally formed structure. On the one hand, there is no need to connect the blocking member 50 and the base 10 through an additional connection process, which simplifies the manufacturing process. At the same time, compared with connecting the blocking member 50 and the base 10 through an additional connection process, the blocking member 50 and the base 10 in an integral structure have a higher connection firmness.

[0171] Optionally, the blocking member 50 may be, but is not limited to, made of metal or non-metal material, for example, the metal material may be copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy or stainless steel, etc., and the non-metal material may be polyethylene, polypropylene, polyvinyl chloride or wood, etc. As an example, the blocking member 50 and the substrate 10 may be made of the same material to simplify the preparation process and help reduce costs.

[0172] The above technical solution provides a blocking member 50 , which can reduce the diameter of the output port 121 , thereby reducing the risk of debris in the external environment blocking the fluid channel 13 , thereby improving the reliability of the liquid injection component 100 .

[0173] In some embodiments, there are multiple through holes 51 , which are spaced apart along the second direction Y, and the first direction X intersects the second direction Y. For example, the number of through holes 51 may be, but is not limited to, two, three, four or more.

[0174] By providing a plurality of through holes 51 , the equivalent aperture of the blocking member 50 can be increased, so as to increase the flow rate of the electrolyte when it is output through the plurality of through holes 51 , thereby improving the injection efficiency of the injection component 100 .

[0175] Optionally, the first direction X is perpendicular to the second direction Y.

[0176] Optionally, the plurality of through holes 51 are distributed in an array to improve the uniformity of the electrolyte output.

[0177] In some embodiments, a surface of the blocking member 50 facing away from the first end surface 11 is flush with the second end surface 12 .

[0178] On the one hand, it is beneficial to reduce the overall volume of the liquid injection component 100, so as to reduce the requirements of the liquid injection component 100 for the working space and improve the adaptability of the liquid injection component 100; on the other hand, it can also improve the appearance smoothness and consistency of the liquid injection component 100, which is beneficial to improving product quality.

[0179] Fig.12 This is a structural schematic diagram of a first state of a liquid injection component 100 and a battery cell provided in some embodiments of the present application. Fig.13 for Fig.12 The cross-sectional structure diagram of the first state of the liquid injection component 100 cooperating with the battery cell is shown in FIG. Fig.14 for Fig.13 Schematic diagram of the local enlarged structure at G, Fig.15 This is a structural schematic diagram of a second state of a liquid injection component 100 and a battery cell provided in some embodiments of the present application. Fig.16 for Fig.15 The cross-sectional structure diagram of the second state of the liquid injection component 100 cooperating with the battery cell is shown in FIG. Fig.17 for Fig.16 Schematic diagram of the local enlarged structure at H.

[0180] Continue to refer Figures 12 to 17 It should be noted that, in the description of the accompanying drawings, the first state in which the liquid injection component 100 cooperates with the battery cell refers to a state in which the liquid injection component 100 has not yet come into contact with the battery cell during the liquid injection process; the second state in which the liquid injection component 100 cooperates with the battery cell refers to a state in which the liquid injection component 100 has completed docking with the battery cell and can inject electrolyte into the interior of the battery cell during the liquid injection process.

[0181] In some embodiments, the battery cell includes a first wall 200, the first wall 200 is provided with a liquid injection hole and an elastic valve 210, the elastic valve 210 is arranged at the liquid injection hole, the first end 211 of the elastic valve 210 in the first direction X protrudes from the outer surface of the first wall 200, and the elastic valve 210 is configured to be able to open and connect the inside and outside of the battery cell when the first end is squeezed. The second end surface 12 is used to squeeze the first end 211, and the protrusion 20 is used to abut against the first wall 200.

[0182] Exemplarily, during the liquid injection process, the output port 121 of the liquid injection component 100 needs to be docked with the elastic valve 210 so that the electrolyte can be injected into the interior of the battery cell. Specifically, before the output port 121 of the liquid injection component 100 is docked with the elastic valve 210, as the liquid injection component 100 gradually approaches the elastic valve 210 along the first direction X, the convex portion 20 will first abut against a portion of the first wall 200 around the elastic valve 210 of the battery cell to form a seal around the output port 121 and the elastic valve 210. Then, as the liquid injection component 100 continues to gradually approach the elastic valve 210 along the first direction X, the second end face 12 of the liquid injection component 100 will abut against the first end 211 of the elastic valve 210 and squeeze the first end 211 to open the elastic valve 210, and then the output port 121 will inject electrolyte into the interior of the battery cell through the elastic valve 210.

[0183] In the above technical solution, during the liquid injection process, the convex part 20 will first form a seal around the outlet 121 and the elastic valve 210, and then the liquid injection component 100 will squeeze the elastic valve 210 to open the valve; after the liquid injection is completed, the elastic valve 210 can be closed first, and then the sealing structure around the outlet 121 and the elastic valve 210 can be removed. On the one hand, the inside of the battery cell can always maintain a vacuum state during the entire liquid injection process, thereby improving the liquid injection effect; on the other hand, the sealing structure formed between the convex part 20 and the first wall 200 can reduce the risk of electrolyte leakage and contamination of the battery cell, thereby improving product quality.

[0184] In some embodiments, the dimension L1 of the protrusion 20 in the first direction X is greater than the dimension L2 of the first end 211 in the first direction X. This can reduce the phenomenon that the protrusion 20 has not yet abutted against the first wall 200 to form a sealing structure when the first end surface 11 of the injection component 100 has squeezed the first end 211 of the elastic valve 210 and opened the elastic valve 210, thereby improving the reliability of the protrusion 20 and further improving the sealing performance of the injection component 100.

[0185] In some optional embodiments, the convex portion 20 includes a first boss 21 and a second boss 22 , the first boss 21 surrounds the output port 121 , and the second boss 22 surrounds the first boss 21 .

[0186] As an example, the dimension L1 of the protrusion 20 in the first direction X may refer to the dimension of the first boss 21 in the first direction X, that is, the dimension of the first boss 21 in the first direction X is greater than the dimension L2 of the first end 211 in the first direction X.

[0187] As another example, the dimension L1 of the protrusion 20 in the first direction X may refer to the dimension of the second boss 22 in the first direction X, that is, the dimension of the second boss 22 in the first direction X is greater than the dimension L2 of the first end 211 in the first direction X.

[0188] As another example, the dimension L1 of the protrusion 20 in the first direction X may refer to the smaller of the dimension of the first boss 21 in the first direction X and the dimension of the second boss 22 in the first direction X, that is, the smaller of the dimension of the first boss 21 in the first direction X and the dimension of the second boss 22 in the first direction X is greater than the dimension L2 of the first end portion 211 in the first direction X.

[0189] In some embodiments, a dimension D1 of the output port 121 in the second direction Y is smaller than a dimension D2 of the first end portion 211 in the second direction Y, and the first direction X intersects with the second direction Y. This can reduce the possibility that the first end portion 211 is accidentally inserted into the output port 121 and affects the injection operation during the process in which the first end surface 11 of the injection component 100 squeezes the first end portion 211 of the elastic valve 210, thereby improving the reliability of the injection component 100.

[0190] In some optional embodiments, the first wall 200 is an end cap.

[0191] According to some embodiments of the present application, the present application also provides a liquid injection device, which includes a liquid supply device, a conveying component and a liquid injection component 100 of any of the above schemes, the liquid supply device is used to provide electrolyte, the conveying component is connected to the liquid supply device and used to convey electrolyte, and the input port 111 of the liquid injection component 100 is connected to the conveying component.

[0192] According to some embodiments of the present application, the present application also provides a battery production equipment, including a liquid injection device according to any of the above schemes.

[0193] In order to better understand the liquid injection component 100 provided in the embodiment of the present application, based on the same inventive concept, an embodiment of the above-mentioned liquid injection component 100 in actual application is provided here for illustration.

[0194] The embodiment of the present application provides a liquid injection component 100, which is used to inject electrolyte into a battery cell. The liquid injection component 100 includes a base 10 and a convex portion 20. The base 10 includes a first end face 11 and a second end face 12 opposite to each other along a first direction X. The first end face 11 is provided with an input port 111, and the second end face 12 is provided with an output port 121. A fluid channel 13 is provided inside the base 10, and the fluid channel 13 is connected to the input port 111 and the output port 121. The convex portion 20 protrudes from the second end face 12, and includes a first boss 21 and a second boss 22. The first boss 21 surrounds the output port 121, and the second boss 22 surrounds the first boss 21. Along the first direction X, the first dimension h1 of the first boss 21 in the first direction X is greater than the second dimension h2 of the second boss 22 in the first direction X.

[0195] The above technical solution can improve the sealing performance of the liquid injection component 100, so as to reduce the risk of electrolyte leakage during the liquid injection process of the battery cell and improve the liquid injection effect.

[0196] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0197] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A liquid injection component for injecting electrolyte into a battery cell, characterized in that: The liquid injection component comprises: A substrate, comprising a first end face and a second end face opposite to each other along a first direction, wherein the first end face is provided with an input port, the second end face is provided with an output port, and a fluid channel is provided inside the substrate, wherein the fluid channel is connected to the input port and the output port; A convex portion protrudes from the second end surface and surrounds the output port.

2. The liquid injection component according to claim 1, characterized in that: The convex portion includes a first boss and a second boss, the first boss surrounds the output port, and the second boss surrounds the first boss.

3. The liquid injection component according to claim 2, characterized in that: A first angle a formed between the inner wall surface of the second boss and the first end surface and directed toward the first boss is an obtuse angle.

4. The liquid injection component according to claim 3, characterized in that: A cross section of the second boss perpendicular to the first direction gradually decreases along the first direction and away from the second end surface.

5. The liquid injection component according to claim 2, characterized in that: Along the first direction, a first dimension h1 of the first boss in the first direction is greater than a second dimension h2 of the second boss in the first direction.

6. The liquid injection component according to claim 5, characterized in that: The first size h1 satisfies the relationship: 0.5 mm ≤ h1 ≤ 10 mm; and / or, The second size h2 satisfies the relationship: 0.2 mm ≤ h2 ≤ 8 mm.

7. The liquid injection component according to claim 6, characterized in that: The first size h1 satisfies the relationship: 1.6 mm ≤ h1 ≤ 3 mm; and / or, The second size h2 satisfies the relationship: 1 mm ≤ h2 ≤ 2 mm.

8. The liquid injection component according to claim 1, characterized in that: The convex part is made of elastic material.

9. The liquid injection component according to claim 1, characterized in that: The fluid channel comprises a first section and a second section distributed along the first direction, the first section is connected to the input port, and the second section is connected to the output port; In the first direction, the projection of the second segment is located within the projection of the first segment.

10. The liquid injection component according to claim 9, characterized in that: The fluid channel further includes a third section, the third section being connected between the first section and the second section; In the direction from the first section to the second section, a size of the third section in the second direction gradually decreases, and the first direction intersects with the second direction.

11. The liquid injection component according to claim 1, characterized in that: The base body comprises a first part and a second part distributed along the first direction, the first end surface is arranged at the first part, and the second end surface is arranged at the second part; In the first direction, a projection of the second portion is located within a projection of the first portion.

12. The liquid injection component according to claim 11, characterized in that: The base body further includes a third portion, wherein the third portion is connected between the first portion and the second portion; In a direction from the first portion to the second portion, a size of the third portion in a second direction gradually decreases, and the first direction intersects with the second direction.

13. The liquid injection component according to claim 1, characterized in that: The liquid injection component further includes a flange member, which surrounds the outer side of the base body and is arranged close to the first end surface.

14. The liquid injection component according to claim 1, characterized in that: The output port includes a plurality of openings, and the plurality of openings are arranged at intervals.

15. The liquid injection component according to claim 14, characterized in that: The plurality of openings include a first opening and a second opening, the first opening is farther away from the convex portion than the second opening, and the diameter of the second opening is smaller than the diameter of the first opening.

16. The liquid injection component according to claim 15, characterized in that: There are multiple second openings, and the multiple second openings are arranged around the first opening.

17. The liquid injection component according to claim 1, characterized in that: The liquid injection component further includes a blocking member, the blocking member is provided with a through hole extending along the first direction, and the blocking member is plugged into the output port.

18. The liquid injection component according to claim 17, characterized in that: There are multiple through holes, and the multiple through holes are distributed at intervals along the second direction, and the first direction intersects with the second direction.

19. The liquid injection component according to claim 17, characterized in that: A side surface of the blocking member facing away from the first end surface is flush with the second end surface.

20. The liquid injection component according to any one of claims 1 to 19, characterized in that: The battery cell comprises a first wall, the first wall is provided with a liquid injection hole and an elastic valve, the elastic valve is arranged at the liquid injection hole, a first end of the elastic valve in the first direction protrudes from an outer surface of the first wall, and the elastic valve is configured to be able to open and connect the inside and the outside of the battery cell when the first end is squeezed; The second end surface is used to press the first end portion, and the protrusion is used to abut against the first wall.

21. A liquid injection device, characterized in that: include: A liquid supply device, used for providing electrolyte; A conveying component, connected to the liquid supply device and used for conveying the electrolyte; The liquid injection component according to any one of claims 1 to 20, wherein the input port is connected to the conveying component.

22. A battery production device, characterized in that: Comprising the liquid injection device as described in claim 21.

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