Sealing structure for battery top cover

Abstract

The utility model relates to a sealing structure for a battery top cover, which relates to the technical field of battery shells and comprises a cover plate, a mounting hole is arranged on the cover plate in a penetrating manner, a pole is arranged in the mounting hole, an upper sealing ring and a lower sealing ring are arranged between the inner wall of the mounting hole and the side wall of the pole, the upper sealing ring is positioned above the lower sealing ring, and the lower sealing ring is positioned above the upper sealing ring. An identification glue layer is arranged at the top of the upper sealing ring, a glue injection cavity is formed among the lower sealing ring, the upper sealing ring, the mounting hole and the pole, a sealing glue layer is arranged in the glue injection cavity, the lower sealing ring, the sealing glue layer, the upper sealing ring and the identification glue layer are all used for sealing a gap between the inner wall of the mounting hole and the outer wall of the pole, and a glue injection channel is formed in the cover plate. And the glue injection channel is communicated with the glue injection cavity. According to the invention, the sealing time between the top cover and the pole is shortened, and the sealing efficiency between the top cover and the pole is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery shells, in particular to a sealing structure for a battery top cover. Background Art

[0002] The electrolyte inside the battery will gradually infiltrate and climb upward along the surface of the pole under the action of capillary phenomenon until it leaks out from the connection between the pole and the cover. Therefore, a sealing structure is installed between the battery cover and the battery pole to solve the leakage problem.

[0003] The related art, including a Chinese patent with authorization announcement number CN206098480U, provides a pole sealing structure, including a receiving groove formed on the battery cover, a pole seal embedded in the receiving groove, the pole seal for the pole to pass through, a sealant disposed between the inner side of the pole seal sidewall and the battery cover, and a marking adhesive disposed on the sealant. The gap between the pole sealant and the pole is sealed by a first annular sealing ring, and the gap between the pole sealant and the battery cover is sealed by a first annular sealing ring and a second annular sealing ring. The gap between the pole sealant and the pole is then filled with sealant, which further fills the gap between the pole sealant and the battery cover. Finally, red and blue marking adhesive is injected onto the surface of the sealant.

[0004] In the process of implementing this application, the inventors found that there are at least the following problems in this technology: when sealing between the battery top cover and the pole, it is necessary to fill in the sealant first and then fill in the identification glue, and it is necessary to wait until the sealant is completely dry and cured before filling in the identification glue. Since the curing time of the sealant is relatively long, the sealing process between the battery top cover and the pole is long. Utility Model Content

[0005] In order to shorten the sealing time between the top cover and the pole and improve the sealing efficiency between the top cover and the pole, the present application provides a sealing structure for a battery top cover.

[0006] The present application provides a battery top cover sealing structure that adopts the following technical solutions:

[0007] A sealing structure for a battery top cover comprises a cover plate, wherein a mounting hole is formed through the cover plate, a pole is arranged in the mounting hole, an upper sealing ring and a lower sealing ring are arranged between the inner wall of the mounting hole and the side wall of the pole, the upper sealing ring is located above the lower sealing ring, an identification glue layer is provided on the top of the upper sealing ring, a glue injection cavity is formed between the lower sealing ring, the upper sealing ring, the mounting hole and the pole, a sealing glue layer is provided in the glue injection cavity, the lower sealing ring, the sealing glue layer, the upper sealing ring and the identification glue layer are all used to seal the gap between the inner wall of the mounting hole and the outer wall of the pole, a glue injection channel is provided in the cover plate, and the glue injection channel and the glue injection cavity are communicated with each other.

[0008] By adopting the above technical solution, when sealing between the battery top cover and the pole, the lower sealing ring is first sleeved on the pole, and then the cover plate is sleeved on the pole, the cover plate and the pole squeeze the lower sealing ring, causing the lower sealing ring to deform, and then the outer wall of the lower sealing ring abuts between the mounting hole and the inner wall of the pole, so that the sealing ring seals the gap between the cover plate and the pole for the first time, and then the upper sealing ring is inserted into the mounting hole, the cover plate and the pole squeeze the upper sealing ring, so that the outer wall of the upper sealing ring fits with the inner wall of the mounting hole and the outer wall of the pole, and then the upper sealing ring seals the cover plate and The gaps between the poles are sealed for the second time, and then the sealant is injected into the gap between the upper sealing ring and the lower sealing ring through the glue injection channel to form a sealant layer. The sealant layer fills the gaps between the cover plate, the upper sealing ring, the lower sealing ring and the pole to form a third seal. At the same time, the identification glue is injected into the top of the upper sealing ring to form an identification glue layer. Since the sealant and the identification glue layer are separated by the upper sealing ring, there is no need to wait for the sealant to dry and solidify before filling the identification glue, which shortens the sealing time between the top cover and the pole and improves the sealing efficiency between the top cover and the pole.

[0009] Preferably, the pole includes an upper pole and a middle pole, the bottom of the upper pole is fixedly connected to the top of the middle pole, the upper pole and the middle pole are coaxially arranged, the diameter of the upper pole is smaller than the diameter of the middle pole, the upper sealing ring is sleeved on the upper pole, and the bottom of the upper sealing ring abuts against the top of the middle pole.

[0010] By adopting the above technical solution, a step is formed between the upper column and the middle column. When the upper sealing ring is inserted into the mounting hole, the middle column limits the upper sealing ring, making it difficult for the upper sealing ring to continue to move closer to the lower sealing ring, thereby creating a cavity between the upper sealing ring and the lower sealing ring, making it easier for the sealant to fill in between the upper sealing ring and the lower sealing ring to form a sealant layer.

[0011] Preferably, the inner wall of the mounting hole and the outer wall of the upper column are both in contact with the side wall of the upper sealing ring, the top wall of the upper sealing ring and the bottom wall of the identification adhesive layer are in contact with each other, and the bottom wall of the upper sealing ring and the top wall of the sealing adhesive layer are in contact with each other.

[0012] By adopting the above technical solution, the upper sealing ring seals between the upper column and the mounting hole, so that the marking glue on the upper sealing ring is not easy to leak downward into the sealant.

[0013] Preferably, a support ring plate is fixedly arranged in the mounting hole, the top of the support ring plate abuts against the bottom of the upper sealing ring, and the outer wall of the support ring plate fits with the sealant layer.

[0014] By adopting the above technical solution, after the upper sealing ring abuts against the center column, the support ring plate supports the upper sealing ring. When the marking glue is injected into the top of the upper sealing ring, the situation where the upper sealing ring bends downward due to gravity and causes glue leakage is reduced.

[0015] Preferably, a glue injection groove is provided on the top of the cover plate, the glue injection groove is communicated with the mounting hole, and the outer wall of the marking glue layer is in contact with the inner wall of the glue injection groove.

[0016] By adopting the above technical solution, the marking glue is injected into the glue injection groove, which increases the cross-section of the marking glue layer, making it easier for the marking glue to achieve the marking effect.

[0017] Preferably, the pole also includes a lower pole, the top of the lower pole is fixedly connected to the bottom of the middle pole, the lower pole and the middle pole are coaxially arranged, the diameter of the lower pole is larger than the diameter of the middle pole, the lower sealing ring is sleeved on the middle pole, and the bottom of the lower sealing ring abuts against the top of the lower pole.

[0018] By adopting the above technical solution, a step is formed between the middle column and the lower column. When the lower sealing ring is sleeved on the pole, the upper column and the middle column pass through the lower sealing ring in sequence, and the lower column limits the lower sealing ring, making it difficult for the lower sealing ring to continue moving, thereby reducing the need to fix the position of the lower sealing ring.

[0019] Preferably, the top wall of the lower sealing ring and the bottom wall of the sealing rubber layer are in contact with each other, and the inner wall of the mounting hole and the outer wall of the center column are both in contact with the side wall of the upper sealing ring.

[0020] By adopting the above technical solution, the lower sealing ring seals the space between the center column and the mounting hole, thereby reducing leakage of electrolyte between the pole and the cover plate.

[0021] Preferably, a limiting ring plate is fixedly provided in the mounting hole, the bottom of the limiting ring plate abuts against the top of the lower sealing ring, and the outer wall of the limiting ring plate fits against the sealing adhesive layer.

[0022] By adopting the above technical solution, after the lower sealing ring is sleeved on the pole, the cover plate is then sleeved on the pole, and the lower sealing ring and the limiting ring plate form abutment, reducing the situation where the limiting ring plate continues to move, thereby making it difficult for the cover plate to continue to move, which is convenient for subsequent processes.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By setting the cover plate, mounting hole, pole, lower sealing ring, sealing glue layer, upper sealing ring, identification glue layer and glue injection channel, the sealing time between the top cover and the pole is shortened and the sealing efficiency between the top cover and the pole is improved;

[0025] 2. By setting up a support ring plate, the situation where the upper sealing ring bends downward due to gravity and causes glue leakage is reduced;

[0026] 3. By setting a limiting ring plate, the cover plate is not easy to move further, reducing the need to fix the cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of a sealing structure for a battery top cover in an embodiment of the present application.

[0028] Figure 2 It is a cross-sectional view showing the connection relationship between the cover and the pole in the embodiment of the present application.

[0029] Explanation of the accompanying reference numerals: 1. Cover plate; 11. Glue injection channel; 12. Glue injection cavity; 13. Glue injection groove; 2. Pole; 21. Upper column; 22. Middle column; 23. Lower column; 3. Lower sealing ring; 4. Sealing glue layer; 5. Upper sealing ring; 6. Marking glue layer; 7. Mounting hole; 71. Support ring plate; 72. Limiting ring plate. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-2 This application is described in further detail.

[0031] The present application embodiment discloses a sealing structure for a battery top cover. Figure 1 and Figure 2, including a cover plate 1, a mounting hole 7 is formed through the cover plate 1, and a pole 2 is inserted into the mounting hole 7. A lower sealing ring 3, a sealing rubber layer 4, an upper sealing ring 5 and a marking rubber layer 6 are arranged in sequence from bottom to top between the inner wall of the mounting hole 7 and the side wall of the pole 2. The lower sealing ring 3 is located below the sealing rubber layer 4, the sealing rubber layer 4 is located below the upper sealing ring 5, and the upper sealing ring 5 is located below the marking rubber layer 6. The sealing rubber layer 4 is formed by solidifying the sealant, and the marking rubber layer 6 is formed by solidifying the marking rubber. The lower sealing ring 3, the sealing rubber layer 4, the upper sealing ring 5 and the marking rubber layer 6 are all used to seal the gap between the inner wall of the mounting hole 7 and the outer wall of the pole 2, wherein a glue injection cavity 12 is formed between the lower sealing ring 3, the upper sealing ring 5, the inner wall of the mounting hole 7 and the outer wall of the pole 2, and the sealing rubber layer 4 is filled in the glue injection cavity 12. A glue injection channel 11 is provided in the cover plate 1, and the glue injection channel 11 is connected to the glue injection cavity 12. The glue injection channel 11 is used to inject sealant between the lower sealing ring 3 and the upper sealing ring 5. When sealing between the battery top cover and the pole 2, the lower sealing ring 3 is first placed on the pole 2, and then the cover plate 1 is placed on the pole 2, so that the cover plate 1 and the pole 2 squeeze the lower sealing ring 3, and then the lower sealing ring 3 is deformed and abuts between the mounting hole 7 and the inner wall of the pole 2, and the upper sealing ring 5 seals the gap between the cover plate 1 and the pole 2 for the first time. Then the upper sealing ring 5 is inserted into the mounting hole 7, and the cover plate 1 and the pole 2 squeeze the upper sealing ring 5, so that the outer wall of the upper sealing ring 5 fits with the inner wall of the mounting hole 7 and the outer wall of the pole 2, and then the upper sealing ring 5 seals the gap between the cover plate 1 and the pole 2 for the second time. After that, the sealant is injected into the injection cavity 12 between the upper sealing ring 5 and the lower sealing ring 3 through the injection channel 11. After the sealant is cured, a sealant layer 4 is formed. The sealant layer 4 fills the gap between the cover plate 1, the upper sealing ring 5, the lower sealing ring 3 and the pole 2, forming a third seal. At the same time, marking glue is injected into the top of the upper sealing ring 5 and solidified to form a marking glue layer 6. Since the sealant and the marking glue layer 6 are separated by the upper sealing ring 5, there is no need to wait for the sealant to dry and solidify before filling with marking glue. This shortens the sealing time between the top cover and the pole 2 and improves the sealing efficiency between the top cover and the pole 2.

[0032] In order to facilitate the installation of the upper sealing ring 5 and the lower sealing ring 3, refer to Figure 1 and Figure 2The pole 2 includes an upper pole 21, a middle pole 22, and a lower pole 23. These poles are coaxially arranged. The bottom of the upper pole 21 is integrally formed with the top of the middle pole 22, and the top of the lower pole 23 is integrally formed with the bottom of the middle pole 22. The diameter of the upper pole 21 is smaller than that of the middle pole 22, while the diameter of the large pole is larger than that of the middle pole 22. A step is formed between the upper pole 21 and the middle pole 22, and between the middle pole 22 and the lower pole 23. The upper sealing ring 5 is mounted on the upper pole 21, with the bottom of the upper sealing ring 5 abutting the top of the middle pole 22. The lower sealing ring 3 is mounted on the middle pole 22, with the bottom of the lower sealing ring 3 abutting the top of the lower pole 23. When the upper and lower sealing rings 5 ​​and 3 are mounted on the pole 2, the middle pole 22 limits the upper sealing ring 5, and the large pole limits the lower sealing ring 3, thereby limiting the installation position of the upper and lower sealing rings 5 ​​and 3 on the pole 2. On the one hand, it makes it difficult for the upper sealing ring 5 and the lower sealing ring 3 to move downward. On the other hand, a cavity is formed between the upper sealing ring 5 and the lower sealing ring 3, which is convenient for the sealant to fill in between the upper sealing ring 5 and the lower sealing ring 3 to form a sealant layer 4.

[0033] refer to Figure 1 and Figure 2 The inner wall of the mounting hole 7 and the outer wall of the upper column 21 are both in contact with the side wall of the upper sealing ring 5, the top wall of the upper sealing ring 5 and the bottom wall of the identification adhesive layer 6 are in contact with each other, and the bottom wall of the upper sealing ring 5 and the top wall of the sealing adhesive layer 4 are in contact with each other. The top wall of the lower sealing ring 3 and the bottom wall of the sealing adhesive layer 4 are in contact with each other, and the inner wall of the mounting hole 7 and the outer wall of the middle column 22 are both in contact with the side wall of the upper sealing ring 5. The upper sealing ring 5 is filled between the upper column 21 and the cover plate 1 to seal the gap between the upper column 21 and the cover plate 1. The lower sealing ring 3 is filled between the middle column 22 and the cover plate 1 to seal the gap between the middle column 22 and the cover plate 1.

[0034] In order to reduce the flow of marking glue into the sealant, refer to Figure 1 and Figure 2 A support ring plate 71 is installed in the mounting hole 7. The support ring plate 71 is integrally formed with the cover plate 1. The top of the support ring plate 71 abuts the bottom of the upper sealing ring 5, and the outer wall of the support ring plate 71 is in contact with the sealant layer 4. After the upper sealing ring 5 abuts the center pillar 22, the support ring plate 71 provides support for the upper sealing ring 5. When the marking glue is injected into the top of the upper sealing ring 5, it reduces the possibility of the upper sealing ring 5 bending downward due to gravity and causing glue leakage.

[0035] To facilitate installation of the cover 1, refer to Figure 1 and Figure 2 A retaining ring plate 72 is installed in the mounting hole 7. The bottom of the retaining ring plate 72 abuts against the top of the lower sealing ring 3, and the outer wall of the retaining ring plate 72 abuts against the sealant layer 4. After the lower sealing ring 3 is placed on the pole 2, the cover plate 1 is placed on the pole 2. The lower sealing ring 3 abuts against the retaining ring plate 72, reducing the possibility of further movement of the retaining ring plate 72 and, in turn, preventing the cover plate 1 from moving further, facilitating subsequent processes.

[0036] In order to increase the cross section of the marking adhesive layer 6, refer to Figure 1 and Figure 2 The top of the cover plate 1 is provided with a glue injection groove 13, which is connected to the mounting hole 7. The outer wall of the marking glue layer 6 is in contact with the inner wall of the glue injection groove 13. The marking glue is injected into the glue injection groove 13, which increases the cross-section of the marking glue layer 6, making it easier for the marking glue to achieve the marking effect.

[0037] The implementation principle of the sealing structure for a battery top cover in the embodiment of the present application is as follows: when sealing between the battery top cover and the pole 2, the lower sealing ring 3 is first sleeved on the pole 2, and then the cover plate 1 is sleeved on the pole 2, so that the cover plate 1 and the pole 2 squeeze the lower sealing ring 3, and then the lower sealing ring 3 is deformed and abuts between the mounting hole 7 and the inner wall of the pole 2, and the upper sealing ring 5 performs the first sealing of the gap between the cover plate 1 and the pole 2. Then, the upper sealing ring 5 is inserted into the mounting hole 7, and the cover plate 1 and the pole 2 squeeze the upper sealing ring 5, so that the outer wall of the upper sealing ring 5 is in contact with the inner wall of the mounting hole 7 and the outer wall of the pole 2, and then the upper sealing ring 5 performs the second sealing of the gap between the cover plate 1 and the pole 2. The sealant is then injected into the injection cavity 12 between the upper sealing ring 5 and the lower sealing ring 3 through the injection channel 11. After the sealant solidifies, it forms a sealant layer 4. The sealant layer 4 fills the gaps between the cover plate 1, the upper sealing ring 5, the lower sealing ring 3, and the pole 2, forming a third seal. Simultaneously, the marking glue is injected into the top of the upper sealing ring 5 and solidified to form a marking glue layer 6. Since the sealant and the marking glue layer 6 are separated by the upper sealing ring 5, there is no need to wait for the sealant to dry and solidify before filling with the marking glue. This shortens the sealing time between the top cover and the pole 2, improving the sealing efficiency between the top cover and the pole 2.

[0038] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A sealing structure for a battery top cover, comprising a cover plate (1), wherein a mounting hole (7) is formed through the cover plate (1), and a pole (2) is arranged in the mounting hole (7), wherein: An upper sealing ring (5) and a lower sealing ring (3) are arranged between the inner wall of the mounting hole (7) and the side wall of the pole (2); the upper sealing ring (5) is located above the lower sealing ring (3); a marking rubber layer (6) is arranged on the top of the upper sealing ring (5); a glue injection cavity (12) is formed between the lower sealing ring (3), the upper sealing ring (5), the mounting hole (7) and the pole (2); a sealing rubber layer (4) is arranged in the glue injection cavity (12); the lower sealing ring (3), the sealing rubber layer (4), the upper sealing ring (5) and the marking rubber layer (6) are all used to seal the gap between the inner wall of the mounting hole (7) and the outer wall of the pole (2); a glue injection channel (11) is arranged in the cover plate (1); the glue injection channel (11) and the glue injection cavity (12) are communicated with each other.

2. A sealing structure for a battery top cover according to claim 1, characterized in that: The pole (2) comprises an upper pole (21) and a middle pole (22); the bottom of the upper pole (21) is fixedly connected to the top of the middle pole (22); the upper pole (21) and the middle pole (22) are coaxially arranged; the diameter of the upper pole (21) is smaller than the diameter of the middle pole (22); the upper sealing ring (5) is sleeved on the upper pole (21); and the bottom of the upper sealing ring (5) abuts against the top of the middle pole (22).

3. A sealing structure for a battery top cover according to claim 2, characterized in that: The inner wall of the mounting hole (7) and the outer wall of the upper column (21) are both in contact with the side wall of the upper sealing ring (5), the top wall of the upper sealing ring (5) and the bottom wall of the marking adhesive layer (6) are in contact with each other, and the bottom wall of the upper sealing ring (5) and the top wall of the sealing adhesive layer (4) are in contact with each other.

4. A sealing structure for a battery top cover according to claim 3, characterized in that: A support ring plate (71) is fixedly arranged in the mounting hole (7), the top of the support ring plate (71) abuts against the bottom of the upper sealing ring (5), and the outer wall of the support ring plate (71) fits against the sealing rubber layer (4).

5. A sealing structure for a battery top cover according to claim 3, characterized in that: A glue injection groove (13) is provided on the top of the cover plate (1), the glue injection groove (13) is communicated with the mounting hole (7), and the outer wall of the marking glue layer (6) and the inner wall of the glue injection groove (13) are in contact with each other.

6. A sealing structure for a battery top cover according to claim 2, characterized in that: The pole (2) further comprises a lower pole (23), the top of the lower pole (23) being fixedly connected to the bottom of the middle pole (22), the lower pole (23) and the middle pole (22) being coaxially arranged, the diameter of the lower pole (23) being larger than the diameter of the middle pole (22), the lower sealing ring (3) being sleeved on the middle pole (22), and the bottom of the lower sealing ring (3) being in contact with the top of the lower pole (23).

7. A sealing structure for a battery top cover according to claim 6, characterized in that: The top wall of the lower sealing ring (3) and the bottom wall of the sealing rubber layer (4) are in contact with each other, and the inner wall of the mounting hole (7) and the outer wall of the center column (22) are both in contact with the side wall of the upper sealing ring (5).

8. A sealing structure for a battery top cover according to claim 7, characterized in that: A limiting ring plate (72) is fixedly arranged in the mounting hole (7), the bottom of the limiting ring plate (72) abuts against the top of the lower sealing ring (3), and the outer wall of the limiting ring plate (72) fits against the sealing rubber layer (4).

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