Electrolyte anti-overflow structure of lithium ion liquid injection hole
By installing rubber gaskets on the injection hole of the lithium-ion battery, the problem of the battery cover being contaminated by electrolyte is solved, and the battery cell appearance defect rate is reduced and the seal reliability is improved.
Patent Information
- Application Number
- CN202421727979.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-07-22
AI Technical Summary
During the injection of lithium-ion batteries, the battery cover is easily contaminated by electrolyte, resulting in an increase in the appearance of the battery cell and a decrease in the seal reliability.
Design a lithium-ion liquid injection hole electrolyte overflow prevention structure, including setting a liquid injection hole on the top cover of the battery and installing a rubber gasket on the liquid injection hole. There are cutting lines on the rubber gasket, and a through hole is formed when the fluid pressure is under the pressure of the fluid, allowing the electrolyte to pass through. After the injection is completed, the through holes are automatically closed to prevent the electrolyte from overflowing.
It effectively prevents the battery cover from being contaminated by electrolyte, reduces the appearance of the battery cell, improves the reliability of the battery cell seal, and is low in cost, making it easy to achieve automated production.
Smart Images
Figure CN223006962U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium-ion battery production, and particularly relates to an electrolyte anti-overflow structure for a lithium-ion injection hole. Background Technique
[0002] A lithium battery, also known as a lithium-ion battery, is a rechargeable battery that uses the movement of lithium ions between the positive and negative electrodes to complete the charging and discharging process. Lithium-ion batteries have the advantages of high energy density, high discharge power, long cycle life, no memory effect, and environmental friendliness. Due to their excellent performance, lithium-ion batteries have become an indispensable energy storage solution in modern life and are widely used in electric vehicles, backup power systems, and microgrid energy storage systems.
[0003] A power lithium-ion battery contains structures such as a wound core, electrolyte, outer shell, and cover plate. During the manufacturing process of a lithium-ion battery, the battery injection process is likely to cause the battery top cover to be contaminated by the electrolyte, resulting in corrosion of positions such as the cell outer shell and explosion-proof valve, thereby increasing the defective rate of the cell appearance and reducing the sealing reliability of the cell.
[0004] To improve this problem, a laser cleaning process is usually added before the injection hole sealing and welding process. However, after adding the laser cleaning process, the laser cleaning process will increase environmental metal dust, and laser cleaning can only clean the electrolyte residue on the surface of the injection hole and cannot completely solve the problem of electrolyte contamination of the explosion-proof valve and the top cover aluminum shell. Content of the Utility Model
[0005] The purpose of the utility model is to provide an electrolyte anti-overflow structure for a lithium-ion injection hole in view of the above deficiencies in the technology, so as to prevent the battery top cover from being contaminated by the electrolyte during the cell injection process, avoid corrosion of positions such as the cell outer shell and explosion-proof valve, thereby reducing the defective rate of the cell appearance and increasing the sealing reliability of the cell.
[0006] To achieve the above purpose, the electrolyte anti-overflow structure for a lithium-ion injection hole designed by the utility model includes an injection hole provided on the battery top cover, and further includes a rubber gasket installed on the injection hole. The injection hole includes a communicating upper injection hole and a lower injection hole. The inner diameter of the upper injection hole is larger than that of the lower injection hole. Several cutting lines penetrating the rubber gasket are opened on the rubber gasket so as to form a through hole for the electrolyte to pass through when under fluid pressure. After the injection is completed, the rubber gasket restores and closes the through hole under the action of elasticity. The rubber gasket is fixedly installed in the upper injection hole, and the through hole communicates with the lower injection hole.
[0007] Preferably, two cutting lines are opened on the rubber gasket, and the two cutting lines intersect and are perpendicular to each other and are symmetrically arranged, so as to better form the through hole when under fluid pressure.
[0008] Preferably, the length of the cutting line is not less than the inner diameter of the liquid injection hole for downward injection, so that the size of the formed through hole matches that of the liquid injection hole for downward injection.
[0009] Preferably, the cutting lines intersect at a point and are symmetrically arranged, so as to better form the through hole when subjected to fluid pressure.
[0010] Preferably, the centers of the liquid injection hole for upward injection and the liquid injection hole for downward injection are on the same vertical line, which is convenient for liquid injection.
[0011] Preferably, the thickness of the rubber gasket is less than the depth of the liquid injection hole for upward injection.
[0012] Preferably, the centers of the liquid injection hole for upward injection, the liquid injection hole for downward injection and the intersection point of the cutting lines are on the same vertical line, which is convenient for liquid injection.
[0013] Preferably, the rubber gasket is in interference fit with the liquid injection hole for upward injection to prevent the rubber gasket from falling off.
[0014] Preferably, a double-sided adhesive is adhered to the lower surface of the rubber gasket to make it better adhere to the inside of the liquid injection hole for upward injection.
[0015] Preferably, the double-sided adhesive is located outside the cutting line to prevent the electrolyte from contacting the double-sided adhesive during liquid injection.
[0016] Compared with the prior art, the utility model has the following advantages:
[0017] 1. The rubber gasket is installed in the liquid injection hole for upward injection, which does not affect the smooth injection of the electrolyte into the battery cell. After the liquid injection is completed, the through hole automatically restores and closes, which can prevent the electrolyte from overflowing from the liquid injection hole.
[0018] 2. The rubber gasket has a low cost and can be provided by the top cover supplier after being pasted well by automated equipment.
[0019] 3. It can prevent the battery top cover from being contaminated by the electrolyte during the liquid injection process of the battery cell, avoid corrosion of positions such as the battery cell housing and explosion-proof valve, thereby reducing the defective rate of the appearance of the battery cell and increasing the sealing reliability of the battery cell. Description of the Drawings
[0020] Figure 1 is a schematic structural diagram of the electrolyte anti-overflow structure of the lithium-ion liquid injection hole of the utility model;
[0021] Figure 2 is Figure 1 the front view of the rubber gasket in
[0022] Description of the Reference Numerals:
[0023] 1 - Battery top cover, 2 - Liquid injection hole, 3 - Rubber gasket, 4 - Upper liquid injection hole, 5 - Lower liquid injection hole, 6 - Cutting line. Detailed implementation mode
[0024] The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0026] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0027] Embodiment 1
[0028] As Figure 1 shown, a structure for preventing electrolyte overflow of a lithium-ion liquid injection hole includes a liquid injection hole 2 provided on a battery top cover 1, and further includes a rubber gasket 3 installed on the liquid injection hole 2. The liquid injection hole 2 includes a connected upper liquid injection hole 4 and a lower liquid injection hole 5. The inner diameter of the upper liquid injection hole 4 is larger than that of the lower liquid injection hole 5. A plurality of cutting lines 6 penetrating the rubber gasket 3 are formed on the rubber gasket 3 so as to form a through hole for the electrolyte to pass through when under fluid pressure. The rubber gasket 3 is fixedly installed in the upper liquid injection hole 4, and the through hole is communicated with the lower liquid injection hole 5.
[0029] During use, the rubber gasket 3 forms a through hole under the pressure of the electrolyte, and the electrolyte can pass through smoothly. After the liquid injection is completed, the rubber gasket 3 restores and closes the through hole under the action of elasticity. At this time, the electrolyte is inside the battery cell, and there will be no pressure to reverse-open the through hole, and the electrolyte will not overflow.
[0030] Example 2
[0031] As Figure 1 shown, a structure for preventing electrolyte overflow at the lithium-ion injection hole includes an injection hole 2 provided on the battery top cover 1, and further includes a rubber gasket 3 installed on the injection hole 2. The injection hole 2 includes a communicating upper injection hole 4 and a lower injection hole 5. The inner diameter of the upper injection hole 4 is larger than that of the lower injection hole 5. Two cutting lines 6 penetrating the rubber gasket 3 are formed on the rubber gasket 3 so as to form a through hole for the electrolyte to pass through when under fluid pressure. The two cutting lines 6 intersect perpendicularly with each other and are symmetrically arranged. The rubber gasket 3 is fixedly installed in the upper injection hole 4, and the through hole communicates with the lower injection hole 5.
[0032] During use, the rubber gasket 3 forms a through hole under the pressure of the electrolyte, and the electrolyte can pass through smoothly. After the injection is completed, the rubber gasket 3 restores and closes the through hole under the action of elasticity. At this time, the electrolyte is inside the battery cell, and there will be no pressure to reverse-open the through hole, so the electrolyte will not overflow.
[0033] In the above embodiment, the length of the cutting line 6 is not less than the inner diameter of the lower injection hole 5, so that the size of the formed through hole matches that of the lower injection hole 5. At the same time, the cutting lines 6 can also intersect at a point and be symmetrically arranged for convenient injection.
[0034] In addition, in Embodiment 1, the centers of the upper injection hole 4 and the lower injection hole 5 are on the same vertical line. In Embodiment 2, the centers of the upper injection hole 4, the lower injection hole 5 and the intersection point of the cutting lines 6 are on the same vertical line, which can make the injection smoother.
[0035] In the above embodiment, the thickness of the rubber gasket 3 is less than the depth of the upper injection hole 4. The rubber gasket 3 is in interference fit with the upper injection hole 4 to prevent the rubber gasket 3 from falling off. A double-sided adhesive can also be adhered to the lower surface of the rubber gasket 3 to make it better adhered inside the upper injection hole 4. Among them, the double-sided adhesive is located outside the cutting line 6 to prevent the electrolyte from contacting the double-sided adhesive during injection.
[0036] In the above embodiment, the material of the rubber gasket 3 is of moderate hardness and softness, the thickness can be less than 1 mm, the double-sided adhesive can provide a strong adhesive force between the rubber and the aluminum material, and does not react with the electrolyte, and its adhesive force does not decrease during the injection process.
[0037] The electrolyte anti-overflow structure of the injection hole of the lithium-ion battery of the present utility model. The rubber gasket 3 is installed in the upper injection hole 4, which does not affect the smooth injection of the electrolyte into the battery cell. After the injection is completed, the through hole automatically restores and closes, which can prevent the electrolyte from overflowing from the injection hole 2. The rubber gasket 3 has a low cost and can be provided by the top cover supplier after being pasted by an automated device. It can prevent the battery top cover 1 from being contaminated by the electrolyte during the injection process of the battery cell, avoid corrosion of positions such as the battery cell shell and explosion-proof valve, thereby reducing the defective rate of the battery cell appearance and increasing the sealing reliability of the battery cell.
[0038] Here, it should be noted that the description of the above technical solution is exemplary. This specification can be embodied in different forms and should not be construed as limited to the technical solutions described herein. On the contrary, providing these descriptions will make the disclosure of the present utility model thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present utility model are only limited by the scope of the claims.
[0039] The shapes, sizes, ratios, angles, and numbers disclosed for various aspects of this specification and the claims are merely examples. Therefore, this specification and the claims are not limited to the details shown. In the following description, when the detailed description of related known functions or configurations is determined to unnecessarily obscure the key points of this specification and the claims, the detailed description will be omitted.
[0040] In the case of using "including", "having", and "containing" described in this specification, unless otherwise stated, it may also have another part or other parts. The terms used can generally be singular but can also represent plural forms.
[0041] It should be pointed out that although terms such as "first", "second", "top", "bottom", "one side", "the other side", "one end", "the other end" may appear and be used in this specification to describe various different components, these components and parts should not be limited by these terms. These terms are only used to distinguish one component and part from another component and part. For example, without departing from the scope of this specification, the first component can be called the second component, and similarly, the second component can be called the first component. In certain cases, the components at the top and bottom can also be swapped or converted with each other; the components at one end and the other end can have the same or different performances.
[0042] When describing positional relationships, for example, when the positional order is described as "on", "above", "below", and "next", unless words or terms such as "exactly" or "directly" are used, it can include the cases where they do not touch or touch each other. If it is mentioned that the first element is located "on" the second element, it does not mean that the first element must be located above the second element in the figure. The upper and lower parts of the component will change according to the viewing angle and the change of orientation. Therefore, in the drawings or in the actual structure, if the case where the first element is located "on" the second element is involved, it can include the case where the first element is located "below" the second element and the case where the first element is located "above" the second element. When describing time relationships, unless "exactly" or "directly" is used, when describing "after", "subsequent", "then", and "before", it can include the cases where the steps are not consecutive. The features of various embodiments of the present invention can be partially or wholly combined or spliced with each other, and can be implemented in various different configurations as can be fully understood by those skilled in the art. The embodiments of the present invention can be implemented independently of each other, or can be implemented together in a mutually dependent relationship.
[0043] Finally, it should be pointed out that the above embodiments are only relatively representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there can be many variations. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention should be considered to fall within the protection scope of the present invention.
Claims
1. A lithium ion injection hole electrolyte overflow prevention structure, comprising an injection hole (2) provided on a battery top cover (1), characterized in that: It also includes a rubber gasket (3) mounted on the injection hole (2), the injection hole (2) includes an upper injection hole (4) and a lower injection hole (5) which are connected, the inner diameter of the upper injection hole (4) is larger than the inner diameter of the lower injection hole (5), the rubber gasket (3) is provided with a plurality of cutting lines (6) penetrating the rubber gasket (3) so that when subjected to fluid pressure, a through hole is formed for the electrolyte to pass through, the rubber gasket (3) is fixedly mounted in the upper injection hole (4), and the through hole is connected to the lower injection hole (5).
2. The electrolyte overflow prevention structure of the lithium ion injection hole according to claim 1, characterized in that: The rubber gasket (3) is provided with two cutting lines (6), and the two cutting lines (6) cross each other, are perpendicular to each other, and are symmetrically arranged.
3. The electrolyte overflow prevention structure of the lithium ion injection hole according to claim 2, characterized in that: The length of the cutting line (6) is not less than the inner diameter of the lower liquid injection hole (5).
4. The electrolyte overflow prevention structure of the lithium ion injection hole according to claim 2, characterized in that: The cutting lines (6) intersect each other at one point and are arranged symmetrically.
5. The electrolyte overflow prevention structure of the lithium ion injection hole according to claim 1, characterized in that: The centers of the upper liquid injection hole (4) and the lower liquid injection hole (5) are on the same vertical line.
6. The electrolyte overflow prevention structure of the lithium ion injection hole according to claim 1, characterized in that: The thickness of the rubber gasket (3) is smaller than the depth of the upper liquid injection hole (4).
7. The electrolyte overflow prevention structure of the lithium ion injection hole according to claim 2 or 4, characterized in that: The centers of the upper liquid injection hole (4), the lower liquid injection hole (5) and the intersection point of the cutting line (6) are on the same vertical line.
8. The electrolyte overflow prevention structure of the lithium ion injection hole according to claim 1, characterized in that: The rubber gasket (3) is interference fit with the upper liquid injection hole (4).
9. The electrolyte overflow prevention structure of the lithium ion injection hole according to claim 1, characterized in that: The lower surface of the rubber gasket (3) is adhered with double-sided tape.
10. The electrolyte overflow prevention structure of the lithium ion injection hole according to claim 9, characterized in that: The double-sided adhesive tape is located outside the cutting line (6).