A potting glue reliability performance test fixture

Abstract

This utility model relates to the field of adhesive technology, specifically a potting compound reliability testing fixture. It includes a fixture base, a fixture body, and a fixture top cover arranged sequentially from bottom to top. The fixture base and fixture top cover are detachably connected, and a receiving cavity for accommodating the fixture body is formed within both. The width of the receiving cavity is greater than the width of the fixture body, thereby forming a potting compound layer on the outside of the fixture body. A groove with the same side length as the fixture body is formed on the top surface of the fixture base, and the fixture body is fitted into the groove. A potting hole for potting compound is opened at the center of the fixture base. This utility model is mainly designed to simulate whether the potting compound will crack or detach due to stress caused by high and low temperatures after solidification during actual use. It has a simple structure and is convenient for repeated use.

Description

Technical Field

[0001] This utility model relates to the field of adhesive technology, specifically to a testing fixture for reliable performance of potting adhesives. Background Technology

[0002] During the manufacturing process of electrical systems / batteries, potting compound is injected into the electrical system / battery enclosure to improve the performance and reliability of the electrical system / battery. The performance evaluation of the potting compound is limited to its viscosity and adhesive strength.

[0003] For example, Chinese patent CN112421088A discloses a battery pack manufacturing method, including the following steps: First, the assembled battery module is placed into the lower housing, maintaining a certain gap between the battery module and the four sides of the lower housing; Second, potting compound is injected into the gap between the battery module and the lower housing, and left to stand for a period of time to allow the potting compound to cure, thus pre-fixing the battery module; Third, the upper housing is sealed and connected to the lower housing to form a complete battery housing; Fourth, potting compound is injected into the battery housing through the potting hole on the upper housing until the potting compound fills the remaining space inside the battery housing, and then left to stand for a period of time to allow the potting compound to cure.

[0004] As can be seen, in practical applications, potting compound is often injected into boxes of various shapes to ensure the uniformity of the compound layer thickness.

[0005] However, such enclosures are usually quite thick, and the adhesive strength and viscosity alone cannot accurately characterize whether the potting compound will crack or detach due to stress caused by high and low temperatures during actual application. Therefore, the performance of the potting compound and its impact on the battery after use are not accurately assessed.

[0006] To address the aforementioned problems, this invention provides a testing fixture for reliable performance of potting compounds. Utility Model Content

[0007] This invention is a test fixture designed to simulate whether potting compound will crack and detach due to stress caused by high and low temperatures during actual use. It features a simple structure and is easy to operate.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a potting compound reliability performance testing fixture, comprising a fixture base, a fixture body and a fixture top cover arranged sequentially from bottom to top;

[0009] The fixture base and the fixture cover are detachably connected, and a receiving cavity for accommodating the fixture body is formed in both of them;

[0010] The width of the receiving cavity is greater than the width of the fixture body, thereby forming a potting compound layer on the outside of the fixture body;

[0011] The top surface of the jig base has a groove with the same side length as the jig body, and the jig body fits into the groove;

[0012] The side of the fixture cover is provided with a filling hole for injecting potting compound, and the filling hole is connected to the fixture base.

[0013] In a more optimized form, the main body of the fixture has four right-angled sides, and the overall shape is a cuboid.

[0014] Ideally, the shape of the receiving cavity is a cylinder capable of accommodating the main body of the fixture, or a cuboid shape with a side length greater than that of the main body of the fixture.

[0015] In a more optimized manner, the top surface of the fixture base is provided with an anti-overflow groove, which surrounds the receiving cavity.

[0016] In a more optimized manner, a cylindrical positioning post is formed at the center of the top surface of the fixture body, and a positioning groove with a shape that matches the positioning post is formed at the corresponding position inside the fixture cover.

[0017] In a more optimized manner, both the surface of the fixture base and the fixture cover are provided with an anti-stick layer, which is a Teflon layer.

[0018] In a more optimized manner, four connecting posts are provided at the four corners of the top surface of the fixture base, which are arranged around the center, and corresponding connecting grooves are provided on the bottom surface of the fixture cover to cooperate with the connecting posts.

[0019] Ideally, the height of the receiving cavity is greater than the height of the main body of the fixture, excluding the positioning post.

[0020] In a more optimized manner, the lower half of the positioning groove is rounded.

[0021] In a more optimized manner, the fixture base and the fixture cover are fixed together by several bolts.

[0022] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0023] (1) In this utility model, the surface of the fixture is coated with Teflon to prevent it from sticking to the fixture during curing.

[0024] (2) In this utility model, four connecting posts are provided at the four corners of the top surface of the fixture base, which are arranged around the center. The bottom surface of the fixture cover is provided with corresponding connecting grooves that cooperate with the connecting posts. The two work together to play a positioning role, and at the same time ensure that the amount of potting compound is the same around the fixture when it is filled, thereby reducing the stress difference of the potting compound caused by the difference in the amount of filling.

[0025] (3) The present invention provides an injection hole on the side of the fixture cover. The injection hole is connected to the fixture base. When injecting the glue, the potting glue can slowly fill the entire cavity and slowly discharge the air in it from the injection holes on both sides, so that the potting glue is more evenly distributed outside the fixture body and avoids leaving air bubbles in the potting layer. Attached Figure Description

[0026] Figure 1 This is an overall structural diagram of Example 1;

[0027] Figure 2 The cross-sectional structure and bottom view of the fixture cover;

[0028] Figure 3 The diagram shows the structure and top view of the fixture base.

[0029] Among them, 1. Fixture base; 11. Insert groove; 13. Anti-overflow groove; 14. Connecting column; 2. Fixture body; 21. Positioning column; 3. Fixture top cover; 31. Receiving cavity; 32. Positioning groove; 33. Connecting groove; 34. Pouring hole; 4. Bolt. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] This utility model discloses a potting compound reliability performance testing fixture, mainly to simulate whether the potting compound will crack or detach due to stress caused by high and low temperatures after solidification during actual use. The specific structure is as follows: Figures 1 to 3 As shown: It mainly consists of three parts, from top to bottom: jig cover 3, jig body 2 and jig base 1.

[0032] The central fixture body 2 is the main component, and potting compound is poured into and solidifies on the outside of the fixture body 2 to form a potting layer. The sides of the fixture body 2 have four right-angled edges, so the overall shape is a cuboid. This is to simulate a battery or electrical system. The right-angle design, compared to the rounded corner design, allows for more rigorous testing of the potting compound's stress shrinkage performance at high and low temperatures, and can cover the customer's actual application scenarios.

[0033] To facilitate the formation of a potting layer on the outside of the fixture body 2, the fixture top cover 3 and the fixture base 1 are each formed with a receiving cavity 31 for accommodating the fixture body 2. These two detachably connected cavities are provided. The width of the receiving cavity 31 is greater than the width of the fixture body 2, and its shape is either cylindrical to accommodate the fixture body 2 or rectangular with a side length greater than that of the fixture body 2. This allows for the formation of a potting layer on the outside of the fixture body 2. After the fixture body 2 is placed inside the receiving cavity 31, the fixture top cover 3 and the fixture base 1 are fixed together, allowing potting compound to be poured into the receiving cavity 31, thus forming the potting layer.

[0034] To facilitate the potting process, this invention features two symmetrically arranged potting holes 34 on the side of the fixture cover 3, extending directly to the fixture base 1 at the bottom. This allows the potting compound to be poured from top to bottom, slowly filling the entire receiving cavity 31 and allowing air to escape slowly through the potting holes 34 on both sides. This ensures a more even distribution of the potting compound outside the fixture body 2 and prevents air bubbles from remaining in the potting layer.

[0035] The top surface of the fixture base 1 has a groove 11 with the same side length as the fixture body 2, and the fixture body 2 is fitted into the groove 11. Simultaneously, a cylindrical positioning post 21 is formed at the center of the top surface of the fixture body 2, and a positioning groove 32 with a shape matching the positioning post 21 is formed at a corresponding position inside the fixture cover 3. Since the receiving cavity 31 is larger than the fixture body 2, directly placing the fixture body 2 into the receiving cavity 31 can easily cause positional displacement, resulting in inconsistent potting layer thickness. The groove 11, in conjunction with the positioning post 21 and the positioning groove 32, accurately places the fixture body 2 into the receiving cavity 31, and places it coaxially with the fixture cover 3, thus preventing variations in the potting layer thickness.

[0036] The height of the receiving cavity 31 is greater than the height of the main body 2 of the fixture excluding the positioning post 21, and the lower half of the positioning groove 32 is rounded. In this way, when potting compound is poured from bottom to top, the position of the main body 2 of the fixture can be avoided due to the rise of the potting compound level, and the rounded corners can guide the positioning post 21 to fit into the positioning groove 32.

[0037] Both the base 1 and the top cover 3 of the fixture are provided with an anti-stick layer, which is a Teflon layer. This prevents the potting compound from sticking to the fixture during curing and allows the top cover 3 and the base 1 of the fixture to be easily removed after the potting compound has bonded and cured to the main body 2 of the fixture.

[0038] The fixture base 1 has four connecting posts 14 arranged around the center at the four corners of its top surface, and the fixture cover 3 has corresponding connecting grooves 33 on its bottom surface that mate with the connecting posts 14. The two work together to provide positioning and ensure that the amount of potting compound is the same around the fixture when it is filled, thus reducing stress differences in the potting compound caused by differences in the amount of filling.

[0039] The top surface of the fixture base 1 is also provided with an anti-overflow groove 13, which surrounds the receiving cavity 31. Since the potting compound is liquid, it is inevitable that it will overflow through the gaps during the filling process. The anti-overflow groove 13 can be used to place the sealing ring to prevent the potting compound from flowing outward when the viscosity is low.

[0040] In addition, to verify the performance of the potting compound under high or low temperature conditions, a heating wire or a cooling layer can be installed inside the fixture cover 3 to control the corresponding temperature.

[0041] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A potting compound reliability performance testing fixture, characterized in that: It includes a jig base (1), a jig body (2), and a jig top cover (3) arranged from bottom to top; The fixture base (1) is detachably connected to the fixture top cover (3), and a receiving cavity (31) for accommodating the fixture body (2) is formed in both of them; The width of the receiving cavity (31) is greater than the width of the fixture body (2), thereby forming a potting compound layer on the outside of the fixture body (2); The top surface of the fixture base (1) has a groove (11) with the same side length as the fixture body (2), and the fixture body (2) is fitted into the groove (11); The upper cover (3) of the fixture has an injection hole (34) for injecting potting compound on its side, and the injection hole (34) is connected to the fixture base (1).

2. The potting glue reliability performance test fixture according to claim 1, characterized in that: The main body (2) of the fixture has four right-angled sides and the overall shape is a cuboid.

3. The potting glue reliability performance test fixture according to claim 2, characterized in that: The cavity (31) is cylindrical in shape to accommodate the fixture body (2), or cuboid in shape with a side length greater than that of the fixture body (2).

4. The potting glue reliability performance test fixture according to claim 1, characterized in that: The top surface of the fixture base (1) is provided with an anti-overflow groove (13), which surrounds the outside of the receiving cavity (31).

5. The potting glue reliability performance test fixture according to claim 1, characterized in that: A cylindrical positioning post (21) is formed at the center of the top surface of the fixture body (2), and a positioning groove (32) with a shape that matches the positioning post (21) is formed at the corresponding position inside the fixture cover (3).

6. The potting glue reliability performance test fixture according to claim 1, characterized in that: The surfaces of the fixture base (1) and the fixture cover (3) are both provided with an anti-stick layer, which is a Teflon layer.

7. The potting compound reliability testing fixture according to claim 1, characterized in that: The fixture base (1) has four connecting posts (14) arranged around the center at the four corners of the top surface, and the fixture cover (3) has connecting grooves (33) that cooperate with the connecting posts (14) at the corresponding positions on the bottom surface.

8. The potting glue reliability performance test fixture according to claim 5, characterized in that: The height of the receiving cavity (31) is greater than the height of the main body of the fixture (2) excluding the positioning post (21).

9. The potting glue reliability performance test fixture according to claim 8, characterized in that: The lower half of the positioning groove (32) is rounded.

10. The potting glue reliability performance test fixture according to claim 1, characterized in that: The fixture base (1) and the fixture cover (3) are fixed together by a number of bolts (4).

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