Sealing element testing device

Abstract

The utility model provides a sealing element testing device which comprises a first main body, a second main body and a second main body, the first main body is provided with a first surface, the second main body is provided with a second surface, the second surface and the first surface are oppositely arranged, the second surface is provided with a boss, an electrolyte cavity and a plurality of volatilization holes are formed in the second main body, and the first ends of the volatilization holes are communicated with the electrolyte cavity; the second end of the volatilization hole penetrates to the second surface; and the sealing piece is arranged on the boss in a sleeving manner and is clamped between the first surface and the second surface. In the experiment process, the electrolyte can volatilize from the volatilization hole and contact with the sealing element, so that the sealing element can be exposed in an electrolyte environment, the state of the sealing element in the battery is simulated, and the influence of the electrolyte on the performance of the sealing element is explored.

Description

Technical Field

[0001] The present application belongs to the technical field of batteries, and specifically relates to a sealing component testing device. Background Art

[0002] As a secondary battery with high energy density and environmental protection, lithium battery is widely used in energy storage and power fields. The safety performance of lithium battery has always been highly concerned by consumers and various companies.

[0003] The top cover is an important component of the lithium battery. In order to ensure the sealing performance of the top cover, a sealing ring is usually provided on the top cover. During long-term use, the sealing ring is exposed to the electrolyte environment. Whether its various performances can still be guaranteed requires some experiments to verify.

[0004] Currently, sealing ring testing equipment can only support experiments at a specific temperature or in a free state, and cannot meet the demand of simulating exposure to an electrolyte environment. Summary of the invention

[0005] In view of this, the utility model provides a sealing component testing device, which simulates an electrolyte environment to explore changes in various properties of the sealing component when it is exposed to the electrolyte.

[0006] In order to achieve the above purpose, the utility model adopts the following scheme:

[0007] A seal testing device includes: a first body having a first surface; a second body having a second surface, the second surface and the first surface are arranged opposite to each other, the second surface is provided with a boss, an electrolyte cavity and a plurality of volatilization holes are provided in the second body, the first end of the volatilization hole is connected to the electrolyte cavity, and the second end of the volatilization hole is connected to the second surface; a seal is sleeved on the boss and sandwiched between the first surface and the second surface. The electrolyte cavity is added to simulate the electrolyte in the battery so that the seal can contact the electrolyte, and then the influence of the electrolyte on the performance of the seal is explored.

[0008] Preferably, a groove is formed on the first surface of the first body to accommodate the boss. The first surface is inwardly recessed to form a groove to accommodate the boss on the second surface, and the first surface can contact the seal to simulate the compression of the seal during use.

[0009] Preferably, the first surface is provided with a convex ring, the inner cavity of the convex ring is used to accommodate the boss, and the convex ring abuts against the seal. The first surface extends toward the second surface to form a convex ring, which is arranged around the boss of the second surface and can accommodate the boss, and the convex ring abuts against the seal, simulating the situation where the seal is compressed during use.

[0010] Preferably, the center line of the volatilization hole is arranged at an angle to the second surface, and the distance from the first end of the volatilization hole to the center line of the boss is greater than the distance from the second end to the center line of the boss. That is, the part of the volatilization hole close to the second surface is inclined toward the boss, which can reduce the escape of electrolyte to the external environment.

[0011] Preferably, in a direction perpendicular to the center line of the boss, a hole wall on one side of the volatilization hole away from the boss extends toward the first body to form a blocking portion, which can prevent the volatilized electrolyte from escaping to the external environment.

[0012] Preferably, the first surface and / or the second surface is provided with a plurality of protrusions, which are arranged around the volatilization hole and the boss. The protrusions are located outside the volatilization hole and the boss, and can prevent the volatilized electrolyte from escaping outward.

[0013] Preferably, the outer circumferences of the first body and the second body are provided with sealant, and the sealant seals the gap between the first body and the second body. The sealant seals the gap between the first body and the second body on the outer circumference to prevent the volatile electrolyte from escaping outward.

[0014] Preferably, the first body and the second body are formed with mounting holes for mounting a fixing component, and the mounting holes are located on the side of the volatilization hole away from the boss. The fixing component can fix the relative position between the first body and the second body to ensure connection reliability; at the same time, the mounting hole is arranged on the side of the volatilization hole away from the boss to avoid the fixing component interfering with the volatilization of the electrolyte to the sealing member.

[0015] Preferably, the second body is formed with a liquid injection port connected to the electrolyte cavity, through which electrolyte can be injected or discharged into the electrolyte cavity to adjust the electrolyte content.

[0016] Preferably, the seal testing device further comprises a heating component, which is in contact with the outer surface of the second body and is used to heat the electrolyte. On the one hand, the heating component can accelerate the volatilization of the electrolyte, and on the other hand, it can simulate the working environment of the battery heating.

[0017] The beneficial effects of the seal testing device designed by the utility model are:

[0018] 1. The seal test device can simulate the electrolyte environment and provide experimental conditions for exploring the performance changes of seals when exposed to the electrolyte environment.

[0019] 2. The sealing component testing device is provided with a structure to prevent the volatile electrolyte from escaping outward, thereby improving the contact degree between the sealing component and the electrolyte.

[0020] 3. The sealing component testing device is provided with a heating component, which can accelerate the volatilization of the electrolyte and ensure that the sealing component can contact the electrolyte. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0022] Figure 1 An exploded view of a sealing component testing device according to an embodiment of the present application;

[0023] Figure 2 A cross-sectional view of a sealing component testing device according to an embodiment of the present application;

[0024] Figure 3 A cross-sectional view of a sealing component testing device according to another embodiment of the present application;

[0025] Figure 4 A cross-sectional view of a seal testing device according to another embodiment of the present application;

[0026] Figure 5 This is a cross-sectional view of a sealing component testing device according to another embodiment of the present application.

[0027] The reference numerals in the specific implementation manner are as follows:

[0028] 1-first body, 11-groove, 12-first mounting hole, 13-convex ring, 14-convexity, 15-sealant;

[0029] 2-second main body, 21-boss, 22-electrolyte chamber, 23-evaporation hole, 24-second mounting hole, 25-liquid injection port, 26-blocking part;

[0030] 3- Seals. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] like Figures 1 to 5As shown, the present application provides a sealing component testing device, including a first body 1 having a first surface; a second body 2 having a second surface, the second surface and the first surface are arranged opposite to each other, a boss 21 is arranged on the second surface, an electrolyte cavity 22 and a plurality of volatilization holes 23 are arranged in the second body, the first end of the volatilization hole is connected to the electrolyte cavity, and the second end of the volatilization hole 23 passes through the second surface; a sealing component 3 is sleeved on the boss 21 and sandwiched between the first surface and the second surface. Among them, the second body 2 is formed with an electrolyte cavity 22, the electrolyte cavity 22 is used to store electrolyte, and the volatilization holes 23 are connected to the electrolyte cavity 22 and the second surface, so that the electrolyte in the electrolyte cavity 22 can volatilize to between the first surface and the second surface, and the sealing component 3 can be in an electrolyte environment.

[0033] The first body 1 can cover the second body 2, and the two can cooperate with each other. Optionally, the shape of the first body 1 can be adapted to the shape of the second body 2 to match the second body 2. And the first surface of the first body 1 can contact and press the seal 3, so that the seal 3 shrinks, simulating the use state of the seal 3 in the battery.

[0034] Optionally, a groove is formed on the first surface of the first body to accommodate the boss. The first surface of the first body 1 is inwardly recessed to form a groove 11, and the depth of the groove 11 is greater than the height of the boss 21 of the second body 2, that is, the groove 11 can accommodate the boss 21 of the second body 2. Among them, the other areas of the first surface are planes, and the plane areas abut against the seal 3 and press the seal 3, such as Figure 1 shown.

[0035] Optionally, the first surface is provided with a convex ring 13, the inner cavity of the convex ring 13 is used to accommodate the boss 21, and the convex ring 13 abuts against the sealing member, such as Figure 2 As shown. The first surface extends toward the second surface to form a convex ring, which is arranged around the boss of the second surface and can accommodate the boss, and the convex ring contacts the seal, simulating the situation that the seal is compressed during use. Among them, the area outside the convex ring 13 of the first surface is a plane area, and the plane area inside the convex ring 13 can be lower than, higher than, or flush with the plane area outside the convex ring 13.

[0036] Optionally, the first body 1 and the convex ring 13 can be integrally formed, that is, the convex ring 13 is directly formed on the surface of the first body 1, for example, stamping, stretching and other forming methods can be used; the first body 1 and the convex ring 13 can also be separately formed as two independent parts, which can be fixed by welding, hot melting, riveting and other methods.

[0037] The second body 2 is provided with volatilization holes 23 penetrating the electrolyte cavity 22 and the second surface to simulate the electrolyte environment in the battery. The electrolyte can volatilize from the volatilization holes 23 to the space between the first body 1 and the second body 2, and the seal 3 located on the boss 21 of the second body 2 can contact the volatilized electrolyte, simulating the contact state with the electrolyte during battery use.

[0038] Optionally, the volatilization holes 23 on the second body 2 are arranged around the sealing member 3, and the distances between any adjacent volatilization holes 23 are equal, and the apertures of the volatilization holes 23 are equal, so that the sealing member 3 can evenly contact the volatilized electrolyte, providing an ideal environment for exploring the performance changes of the sealing member 3. Among them, the diameter of the volatilization hole is closely related to the volatilization speed of the electrolyte. The larger the diameter of the volatilization hole, the faster the volatilization speed of the electrolyte. In order to fully volatilize the electrolyte, the diameter of the volatilization hole is greater than 2 mm.

[0039] Optionally, the volatilization holes 23 are arranged around part of the sealing member 3, that is, a part of the sealing member 3 is not provided with the volatilization holes 23 on the side away from the boss 21, and the other part of the sealing member 3 is provided with the volatilization holes 23 on the side away from the boss 21; or, the apertures of the volatilization holes 23 on the outside of the sealing member 3 are inconsistent; or, the distances between each volatilization hole 23 and the sealing member 3 are different. Different areas of the sealing member 3 have different degrees of contact with the electrolyte, which provides an experimental environment for exploring the performance changes of the sealing member 3 under different electrolyte environment conditions.

[0040] like Figure 4-5 As shown, in some embodiments, the center line of the volatilization hole 23 is set at an angle to the second surface, and the distance from the first end of the volatilization hole to the center line of the boss is greater than the distance from the second end to the center line of the boss. The volatilization hole 23 includes a first end and a second end, the first end is close to the electrolyte chamber 22, and the second end is close to the second surface. Specifically, it can include three structures: the volatilization hole 23 is an inclined structure as a whole, inclined from the first end to the second end, and the inclined direction is toward the boss 21, and the center line of the volatilization hole 23 is at an angle to the center line of the boss 21.

[0041] Optionally, the volatilization hole 23 includes a first section and a second section that are interconnected, an end of the first section away from the second section is a first end of the volatilization hole 23, and an end of the second section away from the first section is a second end of the volatilization hole 23. The center line of the first section is perpendicular to the first surface, and the center line of the second section is set at an angle to the first surface. That is, the first section of the volatilization hole 23 is a vertical structure, and the second section is an inclined structure, and the inclined direction of the second section is toward the boss 21, that is, the center line of the first section of the volatilization hole 23 does not coincide with the center line of the second side, the center line of the first section of the volatilization hole 23 is parallel to the center line of the boss 21, and the center line of the second section forms an angle with the center line of the boss 21, and the angle is located on the side of the second main body 2; the first section of the volatilization hole 23 is an inclined structure, and the inclined direction is away from the boss 21, and the second section of the volatilization hole 23 is an inclined structure, and the inclined direction is toward the boss 21, that is, there is an angle between the center line of the first section of the volatilization hole 23 and the center line of the boss 21, and the angle is located on the side of the second main body 2, and there is also an angle between the center line of the second section of the volatilization hole 23 and the boss 21, and the angle is located on the side of the first main body 1. The portion of the volatilization hole 23 close to the second surface is provided with an inclined structure to limit the volatilization direction of the electrolyte, so that the electrolyte can volatilize toward the sealing member 3, reduce the volatilization of the electrolyte to the external environment, and ensure the contact effect between the sealing member 3 and the volatilized electrolyte.

[0042] like Figure 3 As shown, in some embodiments, in the direction perpendicular to the center line of the boss 21, the hole wall of the volatilization hole 23 on one side away from the boss 21 extends toward the first body 1 to form a blocking portion 26 to prevent the volatilized electrolyte from escaping to the outside. The hole wall of the volatilization hole 23 away from the boss 21 extends toward the side of the first body 1 to form the blocking portion 26, that is, the hole wall close to the boss is flush with the second surface, and the blocking portion 26 protrudes from the second surface, so that the electrolyte volatilized from the volatilization hole 23 is blocked by the blocking portion 26 when volatilizing to the outside and moves toward the side of the boss 21, thereby reducing the electrolyte from escaping to the outside. Among them, the angle between the extension direction of the blocking portion 26 and the second surface can be an acute angle, a right angle, or an obtuse angle.

[0043] like Figure 5As shown, in some embodiments, the first surface and / or the second surface are provided with a plurality of protrusions 14, and the plurality of protrusions 14 are arranged around the volatilization hole 23 and the boss 21: the first surface of the first body 1 is formed with a protrusion 14 facing the second body 2, and the protrusion 14 is arranged around the volatilization hole 23, that is, the protrusion 14 is located on the side of the volatilization hole 23 away from the boss 21, and can prevent the electrolyte from volatilizing to the outside. Among them, the protrusion 14 can be a circumferentially closed protrusion ring 13, and the volatilization hole 23 and the boss 21 are located in the protrusion ring 13; the protrusion 14 can be a plurality of arc-shaped protrusions 14, which are located on the side of the volatilization hole 23 away from the boss 21, and in the direction perpendicular to the center line of the boss 21, the projection of the volatilization hole 23 and the projection of the protrusion 14 have an overlapping part, that is, the protrusion 14 can partially or completely cover the volatilization hole 23, and prevent the electrolyte from volatilizing and escaping to the outside. To enhance the blocking effect of the protrusion 14 on the volatilized electrolyte, the protrusion 14 can extend to the second surface and contact the second surface. Alternatively, the second surface of the second body 2 is formed with the protrusion 14 facing the first body 1, or the first body 1 and the second body 2 are formed with the protrusion 14 at the same time.

[0044] like Figure 5 As shown, in some embodiments, the outer circumference of the first body 1 and the second body 2 is provided with a sealant 15, and the sealant 15 seals the gap between the first body 1 and the second body 2. The first body 1 and the second body 2 are assembled with each other, and there is a space between them, that is, a gap, and the space extends to the outer circumference of the first body 1 and the second body 2. The sealant 15 is provided on the outer circumference to seal the above gap. Among them, the sealant 15 can be a sealing tape, which is used to wrap the first body 1 and the second body 2 on the outer circumference and cover the gap between them; the sealant 15 can also be a liquid glue such as gel, silica gel, etc., which is poured into the gap between the first body 1 and the second body 2 and seals the gap between them after solidification. The use of the sealant 15 to seal the gap between the first body 1 and the second body 2 can provide a closed experimental environment for the seal 3. On the one hand, it prevents the electrolyte from volatilizing to the external environment, and on the other hand, it prevents external impurities from entering the test device and affecting the performance of the seal 3.

[0045] like Figures 1 to 5As shown, in some embodiments, the first body 1 and the second body 2 are formed with mounting holes for installing a fixing component, and the mounting hole is located on the side of the volatilization hole away from the boss. Specifically, the first body 1 is provided with a first mounting hole 12, and the second body is provided with a second mounting hole 24, and the first mounting hole 12 and the second mounting hole 24 can cooperate with each other to install the fixing component. The fixing component cooperates with the mounting holes on the first body 1 and the second body 2, respectively, to fix the first body 1 and the second body 2. Under the action of the fixing component, the first body 1 can press the seal 3 so that the seal 3 produces uniform and stable compression. The mounting hole is located on the side of the volatilization hole 23 away from the boss 21, that is, the fixing component is located on the side of the volatilization hole 23 away from the boss 21, and at the same time, the distance between adjacent mounting holes is greater than the distance between adjacent volatilization holes, so as to avoid interference between the fixing component and the volatilization hole 23 and affect the volatilization of the electrolyte to the seal 3.

[0046] Optionally, the number of fixing components is at least 3, and the distances between adjacent fixing components are equal, and the distances between adjacent fixing components are greater than the distances between adjacent volatilization holes, so that the first body 1 can apply a uniform pressing force to the seal 3, thereby avoiding uneven compression of the seal 3. Of course, if it is necessary to explore the performance changes of the seal 3 under different stress states, the distances and tightening degrees of adjacent fixing components can be different.

[0047] Optionally, the fixing component may be a fixing component such as a bolt, a screw or a threaded rod, which can connect the first body 1 and the second body 2 .

[0048] like Figures 1 to 5 As shown, in some embodiments, the second body 2 is formed with an injection port 25 connected to the electrolyte cavity 22, through which the electrolyte can be injected or discharged into the electrolyte cavity 22, so as to control the content of the electrolyte. When the electrolyte content in the test device is low, the electrolyte can be injected through the injection port 25 to prevent the electrolyte from volatilizing and exhausting; when the electrolyte content in the test device is too much, the excess electrolyte can be discharged through the injection port 25.

[0049] like Figure 5 As shown, in some embodiments, the seal testing device further includes a heating component, which is in contact with the outer surface of the second body 2 and can provide heat to the second body 2 to heat the electrolyte in the electrolyte chamber 22. The volatilization rate of the electrolyte is proportional to the temperature. The higher the temperature, the faster the electrolyte volatilizes. Heating by the heating component can accelerate the testing process of the seal 3. Optionally, the heating component is arranged on the surface of the second body 2 away from the first body 1, that is, on the side opposite to the volatilization direction of the electrolyte, which is conducive to the volatilization of the electrolyte.

[0050] The specific working principle of this seal testing device is:

[0051] Install the seal 3 on the boss 21 of the second body 2, and press the first body 1 onto the second body 2 so that the first body 1 contacts the seal 3 and compresses the seal 3. Adjust the relative positions of the first body 1 and the second body 2 so that the mounting hole of the first body 1 corresponds to the mounting hole of the second body 2, assemble the fixing assembly, fix the first body 1 and the second body 2, and adjust the tightening force of the fixing assembly to control the pressing force of the first body 1 on the seal 3. Inject electrolyte into the injection port 25, and the electrolyte enters the electrolyte cavity 22 of the second body 2 through the injection port 25. The electrolyte evaporates from the electrolyte cavity 22 to between the first body 1 and the second body 2 through the volatilization hole 23, and contacts the seal 3. The relevant performance parameters of the seal 3 exposed to the electrolyte environment are measured by experiment.

[0052] Here we take the rebound and corrosion resistance of seals as an example:

[0053] 1. Investigate the effect of electrolyte environment on the resilience of seals: Place the seal in the seal test device for a period of time and then take it out, measure the thickness of the seal and compare it with the thickness before the experiment. If there is a large difference in thickness, it means that the resilience of the seal is affected.

[0054] 2. Investigate the effect of electrolyte environment on the corrosion resistance of seals: Place the seals in the seal test device for a period of time and take them out. Enlarge the microstructure under a microscope to compare the difference before and after the experiment. After complete drying, use a high-precision scale to compare the weight difference.

[0055] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "horizontal", "top", "bottom", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application 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 understood as a limitation on the present application.

[0056] In the application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] According to the disclosure and teaching of the above description, the technical personnel in the field to which the present application belongs can also change and modify the above implementation. Therefore, the present application is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technical personnel in this field on the basis of the present application belongs to the protection scope of the present application. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present application.

Claims

1. A seal testing device, characterized in that: include: A first body having a first surface; The second body has a second surface, the second surface is arranged opposite to the first surface, the second surface is provided with a boss, an electrolyte cavity and a plurality of volatilization holes are provided in the second body, a first end of the volatilization hole is connected to the electrolyte cavity, and a second end of the volatilization hole is connected to the second surface; The sealing member is sleeved on the boss and sandwiched between the first surface and the second surface.

2. The seal testing device according to claim 1, characterized in that: The first surface is provided with a groove for accommodating the boss.

3. The seal testing device according to claim 1, characterized in that: The first surface is provided with a convex ring, the inner cavity of the convex ring is used to accommodate the boss, and the convex ring abuts against the sealing member.

4. The seal testing device according to claim 1, characterized in that: The center line of the volatilization hole is arranged at an angle with the second surface, and the distance from the first end of the volatilization hole to the center line of the boss is greater than the distance from the second end to the center line of the boss.

5. The seal testing device according to claim 1, characterized in that: In a direction perpendicular to the center line of the boss, a hole wall on one side of the volatilization hole away from the boss extends toward the first body to form a blocking portion.

6. The seal testing device according to claim 1, characterized in that: The first surface and / or the second surface is provided with a plurality of protrusions, and the plurality of protrusions are arranged around the volatilization hole and the boss.

7. The seal testing device according to claim 1, characterized in that: The outer circumferential surfaces of the first body and the second body are provided with sealant, and the sealant seals the gap between the first body and the second body.

8. The seal testing device according to claim 1, characterized in that: The first body and the second body are formed with mounting holes for mounting a fixing component, and the mounting holes are located at a side of the volatilization hole away from the boss.

9. The seal testing device according to claim 1, characterized in that: The second body is formed with a liquid injection port communicating with the electrolyte chamber.

10. The seal testing device according to any one of claims 1 to 9, characterized in that: A heating component is also included, and the heating component is in contact with the outer surface of the second body and is used to heat the electrolyte.

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