Fluororubber sealing rubber nail structure of power battery

Abstract

The utility model discloses a fluororubber sealing rubber nail structure of a power battery. The fluororubber sealing rubber nail structure comprises a rubber nail and an aluminum nail, the plastic nail is inserted into the liquid injection hole, and the end part of the plastic nail is positioned in the countersunk groove of the liquid injection hole; the aluminum nail is welded and fixed in the countersunk groove of the liquid injection hole, the aluminum nail and the countersunk groove of the liquid injection hole clamp the end of the rubber nail, and the compression amount of the end of the rubber nail is 25%-40%. According to the fluororubber sealing glue nail structure of the power battery, double sealing of the glue nail and the aluminum nail has a better sealing effect, the compression amount of the glue nail is 25%-40%, the glue nail has a better sealing effect on a liquid injection hole, welding slag can be prevented from permeating into a battery cell when the aluminum nail is welded, and the sealing effect is good. And when the welding of the aluminum nail fails, the sealing can be ensured by the rubber nail.

Description

Technical Field

[0001] The utility model relates to the technical field of battery structures, in particular to a fluororubber sealing nail structure for a power battery. Background Art

[0002] Sealing nails are seals used to seal the power battery casing. Their main function is to prevent leakage and oxidation of the battery casing, thereby improving the performance and life of the battery.

[0003] In the prior art, conventional sealing nails are made of PP material, which is a polymer formed by polyaddition reaction of propylene. It has chemical resistance, heat resistance, electrical insulation, high-strength mechanical properties and good high-wear processing performance, but poor elasticity. After assembly with the battery cover, if the welding of the aluminum nails sealing the injection hole of the substrate fails, the airtightness test cannot be passed, and the failure of airtightness will cause the battery to leak electrolyte, resulting in battery scrapping and other conditions. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model proposes a fluororubber sealing nail structure for a power battery, which can ensure the sealing effect when the aluminum nail sealing welding fails.

[0005] In order to achieve the above-mentioned purpose, the utility model is realized by the following technical scheme: a power battery fluororubber sealing nail structure, including a nail and an aluminum nail;

[0006] The plastic nail is inserted into the injection hole, and the end portion is located in the countersunk groove of the injection hole;

[0007] The aluminum nail is welded and fixed in the countersunk groove of the injection hole, and clamps the end of the plastic nail with the countersunk groove of the injection hole. The compression amount of the end of the plastic nail is 25%-40%.

[0008] The rubber nail is made of elastic material with good elastic properties. The aluminum nail is welded to the top of the injection hole. During welding, the aluminum nail will compress the rubber nail to form a double-layer sealing effect to protect the safety of the battery cell.

[0009] The beneficial effects of the above-mentioned power battery fluororubber sealing nail structure are: double sealing of the nail and the aluminum nail has a better sealing effect, and the compression amount of the nail is 25%-40%, which has a good sealing effect on the injection hole, which can prevent welding slag from penetrating into the battery cell when the aluminum nail is welded, and can rely on the nail to ensure sealing when the welding of the aluminum nail fails.

[0010] Furthermore, the rubber nail is a T-shaped structure, including a nail rod and a nail head, the nail rod is inserted into the injection hole, the nail head is located in the countersunk groove of the injection hole, the lower side of the nail head abuts against the countersunk groove, and the upper side abuts against the aluminum nail.

[0011] The rubber nail has a T-shaped structure. The nail head is used to compress and seal the injection hole, and the nail rod is inserted into the injection hole for sealing. The T-shaped structure can also prevent it from falling into the battery cell, thereby improving battery safety.

[0012] Furthermore, the length of the nail rod is greater than the straight hole length of the liquid injection hole, and the diameter of the nail head is greater than the straight hole diameter of the liquid injection hole.

[0013] The length of the nail rod is greater than the injection hole, which can improve stability. The diameter of the nail head is greater than the injection hole, which can prevent the rubber nail from falling off and ensure that the injection hole can be compressed and sealed.

[0014] Furthermore, the nail head is made of fluororubber, and the nail rod is made of plastic.

[0015] Fluororubber has good elastic properties, which allows the compression of the nail head to reach 25%-40%.

[0016] Furthermore, the middle part of the aluminum nail has a recessed portion, the nail head is located in the recessed portion, and the aluminum nail is circumferentially welded in the countersunk groove of the injection hole and can seal the injection hole.

[0017] The aluminum nail is welded in the countersunk groove of the injection hole, which can not only seal the injection hole, but also compress the nail head through the recessed part so that the rubber nail seals the injection hole.

[0018] Furthermore, an annular groove is circumferentially formed on the top of the aluminum nail.

[0019] The circular groove on the top allows for easy operation when inserting or removing the aluminum nail.

[0020] Furthermore, a surface of one end of the nail rod away from the nail head is provided with a notch surface, and the notch surface is recessed inwards.

[0021] The notched surface can be used for exhaust when installing the nails to reduce the resistance of the nail assembly.

[0022] Furthermore, the notch surface is a plane.

[0023] Furthermore, three notch surfaces are evenly spaced around the circumference.

[0024] Multiple evenly spaced notch surfaces allow for better air flow and facilitate installation.

[0025] Furthermore, the countersunk groove of the injection hole and the edges of the straight hole are rounded, and the corners between the nail head and the rubber nail are also rounded.

[0026] The rounded edges increase the contact surface and thus improve the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation of the utility model, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0028] Figure 1 A schematic diagram of a battery cover plate and a power battery fluororubber sealing nail structure provided in one embodiment of the utility model;

[0029] Figure 2 for Figure 1 A schematic diagram of the structure of the aluminum nails and rubber nails of the battery cover and the fluororubber sealing rubber nail structure of the power battery shown;

[0030] Figure 3 for Figure 1 A partial cross-sectional view of the battery cover and the power battery fluororubber sealing nail structure shown;

[0031] Figure 4 The test results of the compression size and compression amount of the nail of the fluororubber sealing nail structure of the power battery provided by one embodiment of the utility model;

[0032] Reference numerals:

[0033] 10-battery cover, 11-liquid injection hole;

[0034] 20-plastic nail, 21-nail rod, 22-nail head, 23-notch surface;

[0035] 30-aluminum nail, 31-recessed portion, 32-annular groove. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0037] See also Figures 1 to 3 The utility model provides a fluororubber sealing nail structure for a power battery, including a nail 20 and an aluminum nail 30. When the welding seal of the aluminum nail 30 fails, the nail 20 can continue to ensure the sealing effect of the injection hole 11.

[0038] Specifically, the glue nail 20 is inserted into the injection hole 11 of the battery cover 10. The injection hole 11 is a countersunk hole. The end of the glue nail 20 is located in the countersunk groove. The aluminum nail 30 is welded and fixed in the head groove, and clamps the end of the glue nail 20 with the countersunk groove of the injection hole 11. The compression amount of the end of the glue nail 20 is 25%-40%. The glue nail 20 is made of elastic material with good elasticity. The aluminum nail 30 is welded in the countersunk groove to seal the injection hole 11. The aluminum nail 30 will compress the glue nail 20 during welding, thereby forming a double-layer sealing effect, which can not only prevent the welding slag from penetrating into the battery cell when the aluminum nail is welded, but also rely on the glue nail 20 to ensure the sealing effect when the welding seal of the aluminum nail 30 fails, thereby protecting the safety of the battery cell.

[0039] The specific compression size and compression amount of the above-mentioned glue nails are as follows Figure 4 As shown, all of them can meet the standards after testing.

[0040] Specifically, the glue nail 20 is a T-shaped structure, including a nail rod 21 and a nail head 22. The nail rod 21 is inserted into the straight hole of the injection hole 11, and the nail head 22 is located in the countersunk groove of the injection hole 11. The length of the nail rod 21 is greater than the length of the straight hole of the injection hole, and the diameter of the nail head 22 is greater than the diameter of the straight hole of the injection hole. The T-shaped structure, the nail head 22 is used to compress the injection hole 11 to seal, and the nail rod 21 is inserted into the injection hole 11 to seal, and can also prevent the glue nail from falling into the battery cell, thereby improving the safety protection of the battery cell.

[0041] In this embodiment, the nail head 22 is made of fluororubber, and the nail rod 21 is made of plastic. Fluorine rubber has good elasticity, so that the compression amount of the nail head can reach 25%-40%.

[0042] The middle of the aluminum nail 30 has a recessed portion 31, and the nail head 22 is located in the recessed portion 31. The aluminum nail 30 is welded in the countersunk groove of the injection hole 11 around the circumference, and can seal the injection hole 11. The top of the aluminum nail 30 is provided with an annular groove 32 around the circumference. The aluminum nail 30 is welded in the countersunk groove of the injection hole 11, which can not only seal the injection hole 11, but also accommodate the nail head 22 through the recessed portion 31 and compress the nail head 22 to seal the injection hole 11. The annular groove 32 on the top can facilitate operation when inserting or pulling out the aluminum nail.

[0043] Specifically, a plurality of notch surfaces 23 are circumferentially provided at one end of the nail rod 21 away from the nail head 22. The notch surfaces are concave inward and are flat. The notch surfaces 23 can exhaust air outward when the glue nail 20 is inserted to reduce the assembly resistance of the glue nail 20. In this embodiment, three notch surfaces 23 are circumferentially provided at even intervals.

[0044] Furthermore, the countersunk groove of the injection hole 11 and the edges of the straight hole are rounded, and the corners of the nail head 22 and the rubber nail 20 are also rounded. The rounded edges can increase the contact surface, thereby improving the sealing effect.

[0045] In the above-mentioned power battery fluororubber sealing nail structure, the nail 20 is made of elastic fluororubber material, which improves the elastic performance. When the aluminum nail 30 is welded in the countersunk groove for sealing, the nail 20 can be compressed at the same time and reach a compression amount of 25%-40%, thereby forming a double seal. Even if the welding seal of the aluminum nail 30 fails, the nail 20 can be relied on to ensure a good sealing effect, and the T-shaped structure prevents the nail from falling off, and can also prevent welding slag from penetrating during welding, thereby improving safety.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A power battery fluororubber sealant nail structure, characterized in that: Including plastic nails and aluminum nails; The plastic nail is inserted into the injection hole, and the end portion is located in the countersunk groove of the injection hole; The aluminum nail is welded and fixed in the countersunk groove of the injection hole, and clamps the end of the plastic nail with the countersunk groove of the injection hole. The compression amount of the end of the plastic nail is 25%-40%.

2. The power battery fluororubber sealant nail structure according to claim 1 is characterized in that: The rubber nail is a T-shaped structure, including a nail rod and a nail head. The nail rod is inserted into the injection hole, and the nail head is located in the countersunk groove of the injection hole. The lower side of the nail head abuts against the countersunk groove, and the upper side abuts against the aluminum nail.

3. The power battery fluororubber sealant nail structure according to claim 2 is characterized in that: The length of the nail rod is greater than the straight hole length of the liquid injection hole, and the diameter of the nail head is greater than the straight hole diameter of the liquid injection hole.

4. The power battery fluororubber sealant nail structure according to claim 2, characterized in that: The nail head is made of fluororubber, and the nail rod is made of plastic.

5. The power battery fluororubber sealant nail structure according to claim 2, characterized in that: The middle part of the aluminum nail has a recessed portion, the nail head is located in the recessed portion, and the aluminum nail is circumferentially welded in the countersunk groove of the injection hole and can seal the injection hole.

6. The power battery fluororubber sealant nail structure according to claim 5, characterized in that: An annular groove is circumferentially formed on the top of the aluminum nail.

7. The power battery fluororubber sealant nail structure according to claim 2, characterized in that: A notch surface is provided on the surface of one end of the nail rod away from the nail head, and the notch surface is recessed inwards.

8. The power battery fluororubber sealant nail structure according to claim 7, characterized in that: The notch surface is a plane.

9. The power battery fluororubber sealant nail structure according to claim 7, characterized in that: The notch surfaces are provided with three notches at even intervals around the circumference.

10. The power battery fluororubber sealant nail structure according to claim 2, characterized in that: The countersunk groove of the injection hole and the edges of the straight hole are rounded, and the corners of the nail head and the rubber nail are also rounded.

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