Liquid injection assembly, battery seal structure and battery

Abstract

The application discloses a liquid injection assembly, a battery sealing structure and a battery. The liquid injection assembly comprises a cavity and a conical structure. The conical structure is arranged inside the cavity. The conical structure is provided with a first opening hole upstream in a liquid injection direction. The conical structure is provided with a second opening hole downstream in the liquid injection direction. The second opening hole is adapted to be deformed during liquid injection. The inner diameter of the first opening hole is greater than that of the second opening hole. Thus, the liquid injection assembly has simple and stable design structure and low cost. The liquid injection assembly can effectively reduce electrolyte backflow and does not affect the discharge of formation gas.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to liquid injection components, battery sealing structures, and batteries. Background Technology

[0002] During battery manufacturing, the electrolyte injection and formation processes involve negative pressure, which can easily lead to electrolyte backflow. Electrolyte backflow causes electrolyte loss and reduces injection efficiency, impacting production efficiency. Furthermore, the electrolyte flowing back into the battery can re-enter and contaminate the original electrolyte, potentially degrading battery performance. Therefore, it is necessary to improve this electrolyte backflow problem.

[0003] It should be noted that the above statements are only used to provide background information related to this application and do not necessarily constitute prior art. Utility Model Content

[0004] In a first aspect, this application proposes a liquid injection assembly, including a cavity and a conical structure. The conical structure is disposed inside the cavity. The conical structure has a first opening upstream in the liquid injection direction and a second opening downstream in the liquid injection direction. The second opening is adapted to deform during liquid injection, and the inner diameter of the first opening is larger than the inner diameter of the second opening. Therefore, this liquid injection assembly has a simple and stable design, low cost, effectively reduces electrolyte backflow, and does not affect the discharge of formed gas.

[0005] In addition, the liquid injection assembly according to the above embodiments of this application may also have the following additional technical features:

[0006] In some embodiments of this application, the conical structure includes an elastic frame and a porous membrane, the porous membrane being disposed on the inner side of the elastic frame in the radial direction. Thus, the conical structure possesses sufficient strength to withstand large negative pressure conditions while ensuring unidirectional flow of the electrolyte.

[0007] In some embodiments of this application, the conical structure has a conical inclined wall, with the first opening and the second opening respectively provided on both sides of the conical inclined wall in the axial direction; the conical inclined wall is provided with axial reinforcing ribs extending from the first opening toward the second opening, and the axial reinforcing ribs are configured as a plurality of ribs spaced apart in the circumferential direction. This is beneficial for improving the strength and overall stability of the conical structure.

[0008] In some embodiments of this application, the conical structure has a conical inclined wall, with the first opening and the second opening respectively provided on both sides of the conical inclined wall in the axial direction; the conical inclined wall is provided with circumferential reinforcing ribs extending in the circumferential direction, and the circumferential reinforcing ribs are configured as a plurality of ribs spaced apart in the axial direction. This is beneficial for improving the strength and overall stability of the conical structure.

[0009] In some embodiments of this application, the porous membrane is made of polypropylene fiber, polyurethane, or polytetrafluoroethylene. Therefore, the porous membrane is liquid-proof and gas-permeable, which helps reduce electrolyte backflow and ensures selective gas passage.

[0010] In some embodiments of this application, the pore size of the porous film is 25nm-500nm. Therefore, the process of reducing electrolyte backflow does not affect the discharge of gas from inside the battery.

[0011] In some embodiments of this application, the thickness of the porous film is 8μm-20μm. Therefore, the porous film possesses a certain strength without hindering the release of gas from inside the battery.

[0012] In some embodiments of this application, the elastic frame is made of thermoplastic elastomer, thermoplastic polyurethane, rubber, polyester elastomer, or propylene-based elastomer. Therefore, the elastic frame possesses a certain degree of elasticity and strength, ensuring the stability of the overall structure of the injection assembly under negative pressure conditions.

[0013] In some embodiments of this application, the angle between the generatrix of the conical structure and the central axis is 15°-85°. Therefore, the angle of the conical structure is adjustable, making it suitable for cover plates of different thicknesses.

[0014] In a second aspect, this application proposes a battery sealing structure, including a cover plate and the electrolyte injection assembly described in the first aspect, wherein the electrolyte injection assembly is disposed through the cover plate. Therefore, this battery sealing structure provides better sealing performance, which helps reduce electrolyte backflow.

[0015] In a third aspect, this application proposes a battery including the battery sealing structure described in the second aspect. Therefore, this battery has higher safety performance and longer service life. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a structural diagram of an injection assembly according to an embodiment of this application;

[0018] Figure 2This is a front view of an injection assembly according to an embodiment of this application;

[0019] Figure 3 This is a top view of an injection assembly according to an embodiment of this application;

[0020] Figure 4 (a) is a front view of a tapered structure according to an embodiment of this application, and (b) is a top view of a tapered structure according to an embodiment of this application;

[0021] Figure 5 (a) is a front view of a tapered structure according to an embodiment of this application, and (b) is a top view of a tapered structure according to an embodiment of this application;

[0022] Figure 6 This is a front view of a battery sealing structure according to an embodiment of this application;

[0023] Figure 7 This is a top view of a battery sealing structure according to an embodiment of this application;

[0024] Figure 8 This is a structural diagram of a comparative injection hole in this application;

[0025] Figure 9 This is a front view of a comparative injection hole in this application;

[0026] Figure 10 This is a top view of a comparative injection port of this application;

[0027] Figure 11 This is a front view of a comparative battery sealing structure according to this application;

[0028] Figure 12 This is a top view of a comparative battery sealing structure for this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1-Cavity, 2-Conical structure, 3-First opening, 4-Second opening, 5-Elastic frame, 6-Porous membrane, 7-Axial reinforcing rib, 8-Circumferential reinforcing rib, 9-Injection assembly, 10-Cover plate, 11-Pole post, 12-Injection hole. Detailed Implementation

[0031] The embodiments of this application are described in detail below, with examples of these embodiments shown in the accompanying drawings. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of practically identical structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0032] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit this application; unless otherwise stated, the values ​​of the parameters mentioned in this application can be measured using various measurement methods commonly used in the art (e.g., they can be tested according to the methods given in the embodiments of this application).

[0033] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are open-ended expressions, meaning they include what is specified in this application but do not exclude other aspects.

[0034] In the description of this application, all figures disclosed herein, whether or not the words "approximately" or "about" are used, are approximate values. Each figure may vary by less than 10% or by a difference that is considered reasonable by one of the art, such as 1%, 2%, 3%, 4%, or 5%.

[0035] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is expected that ranges of 60-110 and 80-120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0036] In the description of this application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. "First feature" and "second feature" may include one or more of the indicated feature.

[0038] In the description of this application, "multiple" means two or more.

[0039] In the description of this application, "A and / or B" can include any of the cases of A alone, B alone, or A and B, where A and B are merely examples and can be any technical feature connected by "and / or" in this application.

[0040] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0041] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0042] In a first aspect of this application, a liquid injection assembly is provided, referring to Figures 1-3 The electrolyte injection assembly includes a cavity 1 and a conical structure 2. The conical structure 2 is disposed inside the cavity 1. A first opening 3 is provided upstream of the conical structure 2 in the injection direction, and a second opening 4 is provided downstream of the conical structure 2 in the injection direction. The second opening 4 is adapted to deform during electrolyte injection, and the inner diameter of the first opening 3 is larger than the inner diameter of the second opening 4. The anti-backflow principle of this conical structure mainly lies in the fact that the conical structure forms a unidirectional flow channel for the electrolyte. When the electrolyte flows in the forward direction, the electrolyte flows from the first opening to the second opening. The second opening expands due to force, and the conical structure does not obstruct the normal flow of the electrolyte. When electrolyte backflow occurs, i.e., when the electrolyte flows in the reverse direction, the conical structure is subjected to a force in the reverse flow direction, causing the second opening to elastically close, thereby reducing electrolyte backflow. Therefore, this electrolyte injection assembly has a simple and stable design, low cost, effectively reduces electrolyte backflow, and does not affect the discharge of the formed gas.

[0043] In addition, the liquid injection assembly according to the above embodiments of this application may also have the following additional technical features:

[0044] In some embodiments of this application, reference is made to Figure 4 and Figure 5 The conical structure includes an elastic frame 5 and a porous membrane 6, with the porous membrane 6 disposed on the inner side of the elastic frame 5 in the radial direction. Therefore, this conical structure possesses sufficient strength to withstand large negative pressure conditions while ensuring unidirectional flow of the electrolyte.

[0045] In some embodiments of this application, the tapered structure has tapered inclined walls, and the first opening and the second opening are respectively provided on both sides of the tapered inclined walls in the axial direction; refer to Figure 4 The conical inclined wall is provided with axial reinforcing ribs 7 extending from the first opening toward the second opening. These axial reinforcing ribs are arranged in multiple circumferentially spaced positions. This improves the strength and overall stability of the conical structure.

[0046] In some embodiments of this application, the tapered structure has tapered inclined walls, and a first opening and a second opening are respectively provided on both sides of the tapered inclined walls in the axial direction; see reference Figure 5 The conical inclined wall is provided with circumferential reinforcing ribs 8 extending in the circumferential direction, and the circumferential reinforcing ribs are constructed in a plurality of spaced-apart configurations in the axial direction. This is beneficial to improving the strength and overall stability of the conical structure.

[0047] In some embodiments of this application, the porous membrane is made of polypropylene fiber, polyurethane, or polytetrafluoroethylene. Therefore, the porous membrane is liquid-proof and gas-permeable, which helps reduce electrolyte backflow and ensures selective gas passage.

[0048] In some embodiments of this application, the pore size of the porous film is 25nm-500nm, for example, it can be 25nm, 50nm, 100nm, 200nm, 300nm, 400nm, or 500nm. Therefore, the discharge of gas from inside the battery is not affected during the process of reducing electrolyte backflow.

[0049] In some embodiments of this application, the thickness of the porous film is 8μm-20μm, for example, it can be 8μm, 10μm, 12μm, 14μm, 16μm, 18μm or 20μm. Thus, the porous film has a certain strength without affecting the discharge of gas inside the battery.

[0050] In some embodiments of this application, the elastic frame is made of thermoplastic elastomer, thermoplastic polyurethane, rubber, polyester elastomer, or propylene-based elastomer. Therefore, the elastic frame possesses a certain degree of elasticity and strength, ensuring the stability of the overall structure of the injection assembly under negative pressure conditions.

[0051] In some embodiments of this application, the angle between the generatrix of the tapered structure and the central axis is 15°-85°, for example, it can be 15°, 30°, 45°, 60°, 75°, or 85°. This angle can be flexibly set according to the thickness of the cover plate. Therefore, the angle of the tapered structure is adjustable and suitable for cover plates of different thicknesses.

[0052] The liquid injection component described in this application has at least the following technical advantages:

[0053] (1) The design of the conical structure is simpler than that of the complex mechanical one-way valve. The structure only includes an elastic frame and a porous membrane. The conical structure is placed inside the injection hole and does not affect the external design of the battery cover.

[0054] (2) The conical structure design is more stable than the improved injection hole shape design and has a wider range of applications. The conical structure is suitable for high negative pressure conditions, and the elastic frame has a certain structural strength, which can still ensure reduced liquid backflow within a certain negative pressure range.

[0055] (3) A porous membrane that is liquid-proof and breathable is used, which does not affect the discharge of gas inside the battery while reducing electrolyte backflow.

[0056] In a second aspect of this application, a battery sealing structure is proposed, referring to... Figure 6 and Figure 7The battery sealing structure includes a cover plate 10 and the electrolyte injection assembly 9 described in the first aspect of this application, with the electrolyte injection assembly 9 disposed on the cover plate 10. Furthermore, the cover plate 10 is also provided with an electrode post 11. Therefore, this battery sealing structure has good sealing performance, which helps to reduce electrolyte backflow.

[0057] In some embodiments of this application, the height of the conical structure in the injection assembly can be flexibly set according to the thickness of the cover plate, specifically it can be 30%-100% of the cover plate thickness, for example, it can be 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100%, etc.

[0058] In a third aspect, this application proposes a battery including the battery sealing structure described in the second aspect. Therefore, this battery has higher safety performance and longer service life.

[0059] The following specific embodiments illustrate the solution of this application. It should be noted that these embodiments are for illustrative purposes only and should not be considered as limiting the scope of this application. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0060] Example 1

[0061] In this embodiment, as Figure 1 , Figure 5 and Figure 6 As shown, this embodiment provides a battery sealing structure, which includes a cover plate 10 and a liquid injection assembly 9, the liquid injection assembly 9 being disposed on the cover plate 10. The liquid injection assembly includes a cavity 1 and a conical structure 2, the conical structure 2 being disposed inside the cavity 1. The conical structure 2 has a first opening 3 upstream in the liquid injection direction and a second opening 4 downstream in the liquid injection direction. The second opening 4 is adapted to deform during liquid injection, and the inner diameter of the first opening 3 is larger than the inner diameter of the second opening 4. The conical structure has a conical inclined wall, with the first opening and the second opening respectively disposed on both sides of the conical inclined wall in the axial direction. The conical inclined wall is provided with axial reinforcing ribs 7 extending from the first opening 3 toward the second opening 4, the axial reinforcing ribs 7 being configured as multiple ribs spaced apart in the circumferential direction; the conical inclined wall is also provided with circumferential reinforcing ribs 8 extending in the circumferential direction, the circumferential reinforcing ribs 8 being multiple ribs spaced apart in the axial direction.

[0062] The porous membrane is made of polypropylene fiber with a pore size of 50 nm and a thickness of 10 μm.

[0063] The elastic frame is made of rubber.

[0064] The angle between the generatrix of the tapered structure and the central axis is 30°.

[0065] Comparative Example 1

[0066] In this comparative example, such as Figures 8-12 As shown in the comparative example, this battery sealing structure includes a cover plate 10 and an injection hole 12.

[0067] In summary, this application creates a unidirectional flow channel for the electrolyte by incorporating a conical structure within the injection cavity, thereby reducing electrolyte backflow. The elastic frame provides the conical structure with sufficient elasticity and strength to withstand high negative pressure conditions. Furthermore, the porous membrane utilizes a liquid-proof and gas-permeable material, ensuring that the reduction of electrolyte backflow does not impede the release of internal gas from the battery.

[0068] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A liquid injection assembly, characterized in that, The device includes a cavity and a conical structure. The conical structure is disposed inside the cavity. The conical structure has a first opening upstream in the injection direction and a second opening downstream in the injection direction. The second opening is adapted to deform during injection, and the inner diameter of the first opening is larger than the inner diameter of the second opening.

2. The injection assembly according to claim 1, characterized in that, The conical structure includes an elastic frame and a porous membrane, the porous membrane being disposed on the inner side of the elastic frame in the radial direction.

3. The injection assembly according to claim 1, characterized in that, The conical structure has a conical inclined wall, and the first opening and the second opening are respectively provided on both sides of the conical inclined wall in the axial direction; The tapered inclined wall is provided with axial reinforcing ribs extending from the first opening toward the second opening, and the axial reinforcing ribs are configured as a plurality of ribs spaced apart in the circumferential direction; and / or The tapered inclined wall is provided with circumferential reinforcing ribs extending in the circumferential direction, and the circumferential reinforcing ribs are constructed as a plurality of circumferential reinforcing ribs spaced apart in the axial direction.

4. The injection assembly according to claim 2, characterized in that, The porous membrane is made of polypropylene fiber, polyurethane, or polytetrafluoroethylene.

5. The injection assembly according to claim 2, characterized in that, The porous film has a pore size of 25nm-500nm.

6. The injection assembly according to claim 2 or 4, characterized in that, The thickness of the porous film is 8μm-20μm.

7. The injection assembly according to claim 2, characterized in that, The material of the elastic frame is thermoplastic elastomer, thermoplastic polyurethane, rubber, polyester elastomer, or propylene-based elastomer.

8. The injection assembly according to claim 1, characterized in that, The angle between the generatrix of the tapered structure and the central axis is 15°-85°.

9. A battery sealing structure, characterized in that, It includes a cover plate and an injection assembly according to any one of claims 1-8, wherein the injection assembly is disposed on the cover plate.

10. A battery, characterized in that, Includes the battery sealing structure as described in claim 9.

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