Negative pressure packaging method for aluminum electrolytic capacitor

Abstract

The present invention discloses a negative pressure packaging method for aluminum electrolytic capacitors, comprising: inserting a core into a sealing body. Placing the core, the sealing body and the outer shell in the inner cavity of a receiving mechanism, and sealing the receiving mechanism. Evacuating the inner cavity of the receiving mechanism so that the inner cavity of the receiving mechanism is in a negative pressure state. The sealing body and the outer shell are packaged so that the sealing body is located at a first depth of the outer shell. The sealing body and the outer shell are pressed together so that the sealing body is located at a second depth of the outer shell, and the second depth is closer to the bottom of the outer shell relative to the first depth. The method solves the problem of the sealing body sliding too long on the inner wall of the outer shell in the prior art, avoids overheating of the friction surface of the sealing body and slight melting, and can ensure that the outer diameter of the sealing body will not shrink, thereby ensuring the airtightness of the outer shell and the sealing body, realizing the negative pressure packaging of the aluminum electrolytic capacitor, improving the stability of the product and increasing the service life of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitors, and in particular to a negative pressure packaging method for aluminum electrolytic capacitors. Background Art

[0002] At present, traditional aluminum electrolytic capacitors are packaged under normal pressure, but packaging aluminum electrolytic capacitors under normal pressure will reduce the service life of the product and cannot be adapted for use in today's electronic products. In the actual production of aluminum electrolytic capacitors, the sealing body seals the opening of the outer shell, so that the inner cavity of the outer shell is in a sealed state. When the sealing body is squeezed into the opening of the outer shell, the sealing body has a large tension, and there is a large friction force when the sealing body slides relative to the outer shell. The process of the prior art is to slide the sealing body directly to the opening of the outer shell at one time, so that the sliding distance of the sealing body on the inner wall of the outer shell opening is too long, and the friction between the inner wall of the outer shell opening and the sealing body generates a large amount of heat. The large amount of heat will cause the sealing body to melt slightly, resulting in the shrinkage of the outer diameter of the sealing body, affecting the airtightness of the outer shell and the sealing body, and it is impossible to obtain an aluminum electrolytic capacitor with high external airtightness and internal negative pressure. Summary of the invention

[0003] Based on this, it is necessary to provide a negative pressure packaging method for aluminum electrolytic capacitors to solve the technical problem in the prior art that the outer diameter of the sealing body shrinks, thereby affecting the airtightness between the shell and the sealing body.

[0004] The present invention provides a negative pressure packaging device for an aluminum electrolytic capacitor, comprising the following steps:

[0005] Insert the element core into the sealing body;

[0006] Placing the element core, the sealing body and the outer shell in the inner cavity of the accommodating mechanism, and sealing the accommodating mechanism;

[0007] Vacuuming the inner cavity of the accommodating mechanism so that the inner cavity of the accommodating mechanism is in a negative pressure state;

[0008] Encapsulating the sealing body and the shell so that the sealing body is located at a first depth of the shell;

[0009] The sealing body is pressed together with the outer shell so that the sealing body is located at a second depth of the outer shell, wherein the second depth is closer to the bottom end of the outer shell than the first depth.

[0010] Furthermore, the step of placing the element core, the sealing body and the outer shell in the inner cavity of the accommodating mechanism and sealing the accommodating mechanism includes:

[0011] Placing the sealing body and the shell in the inner cavity of the accommodating mechanism, wherein the accommodating mechanism has a first opening end and a second opening end opposite to the first opening end;

[0012] The first cover plate is moved toward the first opening end to approach and seal the opening corresponding to the first opening end, and the second cover plate is moved toward the second opening end to approach and seal the opening corresponding to the second opening end, thereby sealing the accommodating mechanism.

[0013] Furthermore, the step of encapsulating the sealing body and the shell so that the sealing body is located at a first depth of the shell includes:

[0014] A first pressing rod is disposed through the first cover plate, and the first pressing rod drives the sealing body to be pressed toward the outer shell;

[0015] The second pressing rod is disposed through the second cover plate, and the second pressing rod drives the outer shell to be pressed toward the sealing body, so that the sealing body is located at a first depth of the outer shell.

[0016] Furthermore, the first pressure rod is disposed through the first cover plate, and the step of the first pressure rod driving the sealing body to be pressed toward the outer shell includes:

[0017] The first pressure rod is disposed through the first cover plate, and the first pressure rod drives the sealing body to approach the outer shell so that the sealing body seals the outer shell;

[0018] Switching the negative pressure state of the inner cavity of the accommodating mechanism to the atmospheric pressure state;

[0019] The first pressing rod applies a force toward the bottom of the shell to the sealing body, so as to drive the sealing body to be located at a first depth of the shell.

[0020] Furthermore, before the step of pressing the sealing body and the shell together so that the sealing body is located at a second depth of the shell, wherein the second depth is closer to the bottom of the shell than the first depth, the step includes:

[0021] When the sealing body is located at a first depth of the shell, the first pressure rod and the first cover plate move in a direction away from the sealing body, and the second pressure rod and the second cover plate move in a direction away from the shell;

[0022] The receiving mechanism is transported to the next pressing station.

[0023] Furthermore, the step of pressing the sealing body and the shell together so that the sealing body is located at a second depth of the shell, wherein the second depth is closer to the bottom of the shell than the first depth, comprises:

[0024] The third cover plate seals the opening corresponding to the first opening end of the accommodating mechanism, and the fourth cover plate seals the opening corresponding to the second opening end of the accommodating mechanism, so as to seal the accommodating mechanism;

[0025] A third pressing rod is disposed through the third cover plate, and the third pressing rod drives the sealing body to be pressed toward the outer shell;

[0026] The fourth pressing rod is disposed through the fourth cover plate, and the fourth pressing rod drives the outer shell to be pressed toward the sealing body, so that the sealing body is located at the second depth of the outer shell.

[0027] Furthermore, the third pressure rod is disposed through the third cover plate, and the step of the third pressure rod driving the sealing body to be pressed toward the outer shell further includes:

[0028] The negative pressure state of the inner cavity of the accommodating mechanism is switched to the atmospheric pressure state.

[0029] Furthermore, the step of pressing the sealing body and the shell together so that the sealing body is located at a second depth of the shell, wherein the second depth is closer to the bottom of the shell than the first depth, further comprises:

[0030] The sealing body and the outer shell are pressed together for a second time, so that the sealing body is located at a third depth of the outer shell, and the third depth is closer to the bottom end of the outer shell than the second depth.

[0031] Furthermore, the step of performing secondary pressing on the sealing body and the shell so that the sealing body is located at a third depth of the shell, wherein the third depth is closer to the bottom end of the shell relative to the second depth, comprises:

[0032] The fifth cover plate seals the opening corresponding to the first opening end of the accommodating mechanism, and the sixth cover plate seals the opening corresponding to the second opening end of the accommodating mechanism, so as to seal the accommodating mechanism;

[0033] A fifth pressing rod is disposed through the fifth cover plate, and the fifth pressing rod drives the sealing body to be pressed toward the outer shell;

[0034] The sixth pressing rod is disposed through the sixth cover plate, and the sixth pressing rod drives the outer shell to be pressed toward the sealing body, so that the sealing body is located at a third depth of the outer shell.

[0035] Furthermore, the step of performing secondary pressing on the sealing body and the shell so that the sealing body is located at a third depth of the shell, wherein the third depth is closer to the bottom of the shell relative to the second depth, further comprises:

[0036] A waist treatment is performed at the seal of the shell.

[0037] The present invention provides a negative pressure packaging method for aluminum electrolytic capacitors, wherein a core is inserted into a sealing body to form a sealing body, and the sealing body and the shell are packaged under a negative pressure state, and the sealing body and the shell are first packaged so that the sealing body is located at a first depth of the shell, and then the sealing body is pressed so that the sealing body is located at a second depth of the shell, and the second depth is closer to the bottom of the shell relative to the first depth. By this method, the sealing body reaches the first depth of the shell and then is pressed into the second depth of the shell, which solves the problem of the sealing body sliding too long on the inner wall of the shell in the prior art, avoids overheating of the friction surface of the sealing body and produces slight melting, and can ensure that the outer diameter of the sealing body will not shrink, thereby ensuring the airtightness of the shell and the sealing body. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0039] Figure 1 Flow chart of a negative pressure packaging method for an aluminum electrolytic capacitor in an embodiment of the present invention;

[0040] Figure 2 Flow chart of the steps of pressing the sealing body and the shell together in an embodiment of the present invention;

[0041] Figure 3 Flow chart of the secondary pressing steps of the sealing body and the shell in an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the results before the sealing body and the shell are packaged in an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the structure in which the sealing body is located at a first depth of the housing in an embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram of the structure in which the sealing body is located at the second depth of the shell in an embodiment of the present invention;

[0045] Figure 7 This is a schematic diagram of the structure in which the sealing body is located at the third depth of the shell in an embodiment of the present invention;

[0046] Figure 8 Schematic diagram of the structure of the negative pressure packaging equipment in an embodiment of the present invention.

[0047] Main components:

[0048] 1. Accommodating mechanism; 2. First pressure rod; 3. First cover plate; 4. Second pressure rod; 5. Second cover plate; 6. Third pressure rod; 7. Third cover plate; 8. Fourth pressure rod; 9. Fourth cover plate; 10. Fifth pressure rod; 11. Fifth cover plate; 12. Sixth pressure rod; 13. Sixth cover plate; 14. Element core; 15. Sealing body; 16. Outer shell.

[0049] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0052] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0053] like Figure 1 As shown, in some embodiments, a negative pressure packaging method for an aluminum electrolytic capacitor includes the following steps:

[0054] S100 , insert the element core 14 into the sealing body 15 .

[0055] S200 , placing the element core 14 , the sealing body 15 and the outer shell 16 in the inner cavity of the accommodating mechanism 1 , and sealing the accommodating mechanism 1 .

[0056] S300, evacuating the inner cavity of the accommodating mechanism 1 so that the inner cavity of the accommodating mechanism 1 is in a negative pressure state.

[0057] S400 , encapsulating the sealing body 15 and the outer shell 16 so that the sealing body 15 is located at a first depth of the outer shell 16 .

[0058] S500 , pressing the sealing body 15 and the outer shell 16 together so that the sealing body 15 is located at a second depth of the outer shell 16 , and the second depth is closer to the bottom end of the outer shell 16 than the first depth.

[0059] By this method, the sealing body 15 reaches the first depth of the outer shell 16 and then is pressed into the second depth of the outer shell 16, which solves the problem of the sealing body 15 sliding too long on the inner wall of the outer shell 16 in the prior art, avoids overheating of the friction surface of the sealing body 15 and slight melting, and can ensure that the outer diameter of the sealing body 15 will not shrink, thereby ensuring the airtightness of the outer shell 16 and the sealing body 15.

[0060] Aluminum electrolytic capacitors generate heat during operation. The sealing body 15 of the aluminum electrolytic capacitor is affected by heat for a long time, and the sealing body 15 will shrink slightly, causing a gap between the sealing body 15 and the outer shell 16, causing the dielectric inside the aluminum electrolytic capacitor to evaporate to the outside of the aluminum electrolytic capacitor, reducing the mass of the electrolyte, and greatly reducing the service life of the electrolytic capacitor. The element core 14 of the aluminum electrolytic capacitor generates heat during operation. Under normal pressure, the heat will produce expanding gas, while under negative pressure, no expanding gas will be produced, which can increase the service life of the aluminum electrolytic capacitor. Packaging under normal pressure will reduce the service life, while packaging under negative pressure can extend the service life. The method is to package the sealing body 15 and the outer shell 16 under negative pressure, so that the inner shell 16 is also under negative pressure to ensure that the mass of the electrolyte will not decrease, greatly increasing the service life of the aluminum electrolytic capacitor.

[0061] Specifically, the shell 16 can be an aluminum shell, that is, a cylindrical cup-shaped body cast or stamped from aluminum. The sealing body 15 is a rubber plug, and the sealing body 15 is in the shape of a cylinder, and the outer diameter of the sealing body 15 is greater than the inner diameter of the shell 16. The sealing body 15 is fixedly connected to the element core 14 and forms a stepped surface, and the stepped surface abuts against the shell 16 so that the shell 16 and the sealing body 15 form a negative pressure sealed cavity. The element core 14 is formed into a cylindrical shape by combining electrolytic aluminum foil, guide pins and dielectric paper.

[0062] In some embodiments, an aluminum electrolytic capacitor includes a shell 16, a core 14, a sealing body 15 and a dielectric, wherein the sealing body 15 is fixedly connected to the core 14 and forms a stepped surface, wherein the stepped surface abuts against the shell 16 so that the shell 16 and the sealing body 15 form a sealed cavity, wherein the dielectric is disposed in the sealed cavity, and the core 14 is accommodated in the dielectric. Specifically, the air in the sealed cavity is evacuated before the stepped surface abuts against the shell 16, so that the sealed cavity is a negative pressure sealed cavity, and the negative pressure sealed cavity is in a gas pressure state lower than atmospheric pressure. Furthermore, the shell 16 and the sealing body 15 are both cylindrical, and the outer diameter of the sealing body 15 is greater than the inner diameter of the shell 16.

[0063] In some embodiments, S200, the step of placing the element core 14, the sealing body 15 and the outer shell 16 in the inner cavity of the accommodating mechanism 1, and sealing the accommodating mechanism 1 includes:

[0064] S210, placing the element core 14, the sealing body 15 and the outer shell 16 in the inner cavity of the accommodating mechanism 1, wherein the accommodating mechanism 1 has a first opening end and a second opening end opposite to the first opening end.

[0065] S220 , move the first cover plate 3 toward the first opening end and seal the opening corresponding to the first opening end, move the second cover plate 5 toward the second opening end and seal the opening corresponding to the second opening end, thereby sealing the accommodating mechanism 1 .

[0066] Specifically, S400, the step of encapsulating the sealing body 15 and the outer shell 16 so that the sealing body 15 is located at a first depth of the outer shell 16 includes:

[0067] S410 , the first pressing rod 2 is disposed through the first cover plate 3 , and the first pressing rod 2 drives the sealing body 15 to be pressed toward the outer shell 16 .

[0068] S420 , the second pressing rod 4 is disposed through the second cover plate 5 , and the second pressing rod 4 drives the outer shell 16 to be pressed toward the sealing body 15 , so that the sealing body 15 is located at a first depth of the outer shell 16 .

[0069] More specifically, in S410, the first pressing rod 2 is passed through the first cover plate 3, and the first pressing rod 2 drives the sealing body 15 to be pressed toward the outer shell 16, comprising:

[0070] S411, the first pressing rod 2 is disposed through the first cover plate 3, and the first pressing rod 2 drives the sealing body 15 to approach the outer shell 16, so that the sealing body 15 seals the outer shell 16;

[0071] S412, switching the negative pressure state of the inner cavity of the accommodating mechanism 1 to the atmospheric pressure state;

[0072] S413 , the first pressing rod 2 applies a force to the sealing body 15 toward the bottom of the shell 16 to drive the sealing body 15 to be located at a first depth of the shell 16 .

[0073] The sealing body 15 and the outer shell 16 are packaged under a negative pressure state, that is, the sealing body 15 has partially entered the outer shell 16, and the inner cavity of the outer shell 16 is in a sealed negative pressure state. At this time, air is pumped into the inner cavity of the accommodating component to switch the negative pressure state of the inner cavity of the accommodating mechanism 1 to the atmospheric pressure state. The air pressure in the inner cavity of the accommodating mechanism 1 is greater than the air pressure in the inner cavity of the outer shell 16, thereby driving the sealing body 15 to be squeezed toward the bottom of the outer shell 16. By switching the negative pressure state of the inner cavity of the accommodating mechanism 1 to the atmospheric pressure state, the sealing body 15 can be more easily squeezed to the first depth of the outer shell 16.

[0074] Further, before the step of pressing the sealing body 15 and the shell 16 together at S500 so that the sealing body 15 is located at a second depth of the shell 16, wherein the second depth is closer to the bottom of the shell 16 than the first depth, the following steps are included:

[0075] S501, when the sealing body 15 is located at a first depth of the outer shell 16, the first pressure rod 2 and the first cover plate 3 move away from the sealing body 15, and the second pressure rod 4 and the second cover plate 5 move away from the outer shell 16;

[0076] S502, transporting the accommodating mechanism 1 to the next pressing station.

[0077] When the sealing body 15 is located at the first depth of the housing 16 , it is necessary to enter the next pressing station, and the first pressing rod 2 , the first cover plate 3 , the second pressing rod 4 and the second cover plate 5 need to be separated from the accommodating mechanism 1 first.

[0078] Furthermore, if Figure 2 As shown, S500, the step of pressing the sealing body 15 and the shell 16 so that the sealing body 15 is located at a second depth of the shell 16, and the second depth is closer to the bottom of the shell 16 relative to the first depth includes:

[0079] S510, the third cover plate 7 seals the opening corresponding to the first opening end of the accommodating mechanism 1, and the fourth cover plate 9 seals the opening corresponding to the second opening end of the accommodating mechanism 1, so as to seal the accommodating mechanism 1;

[0080] S520, the third pressing rod 6 is disposed through the third cover plate 7, and the third pressing rod 6 drives the sealing body 15 to be pressed toward the outer shell 16;

[0081] S530 , the fourth pressing rod 8 passes through the fourth cover plate 9 , and the fourth pressing rod 8 drives the outer shell 16 to be squeezed toward the sealing body 15 , so that the sealing body 15 is located at the second depth of the outer shell 16 .

[0082] Preferably, S520, the step of the third pressing rod 6 penetrating the third cover plate 7, and the third pressing rod 6 driving the sealing body 15 to be pressed toward the outer shell 16 further includes:

[0083] S521, switching the negative pressure state of the inner cavity of the accommodating mechanism 1 to the atmospheric pressure state. The effect of this step is the same as described above and will not be repeated here.

[0084] In some embodiments, S500, the step of pressing the sealing body 15 and the outer shell 16 so that the sealing body 15 is located at a second depth of the outer shell 16, and the second depth is closer to the bottom of the outer shell 16 relative to the first depth, further includes:

[0085] S600 , performing secondary pressing on the sealing body 15 and the outer shell 16 , so that the sealing body 15 is located at a third depth of the outer shell 16 , and the third depth is closer to the bottom end of the outer shell 16 than the second depth.

[0086] like Figures 4 to 8 As shown, the total length of the sealing body 15 moving relative to the outer shell 16 is L. During packaging, the sealing body 15 is squeezed and frictionally moved by L at one time. Since the friction system is relatively large, the one-time friction movement is L. Due to the frictional heating, the sealing body 15 instantly heats up, so that the sealing body 15 is damaged, thereby destroying the airtightness between the sealing body 15 and the outer shell 16. By setting the first pressing device and the second pressing device, after being processed by the packaging device, the sealing body 15 moves L1 relative to the outer shell 16 (that is, the sealing body 15 is at the first depth of the outer shell 16), after being processed by the first pressing device, the sealing body 15 moves L2 relative to the outer shell 16 (that is, the sealing body 15 is at the second depth of the outer shell 16), and after being processed by the second pressing device, the sealing body 15 moves L3 relative to the outer shell 16 (that is, the sealing body 15 is at the third depth of the outer shell 16), and L is the sum of L1, L2 and L3. The sealing body 15 moves in the outer shell 16 three times. As the friction distance is shortened each time, damage to the sealing body 15 due to heat rise caused by long-distance friction is avoided, so that the sealing body 15 and the outer shell 16 after packaging are more airtight.

[0087] like Figure 3 As shown, S600, the step of performing secondary pressing on the sealing body 15 and the outer shell 16 so that the sealing body 15 is located at a third depth of the outer shell 16, and the third depth is closer to the bottom end of the outer shell 16 relative to the second depth includes:

[0088] S610, the fifth cover plate 11 seals the opening corresponding to the first opening end of the accommodating mechanism 1, and the sixth cover plate 13 seals the opening corresponding to the second opening end of the accommodating mechanism 1, so as to seal the accommodating mechanism 1;

[0089] S620, the fifth pressing rod 10 is disposed through the fifth cover plate 11, and the fifth pressing rod 10 drives the sealing body 15 to be pressed toward the outer shell 16;

[0090] S630 , the sixth pressing rod 12 passes through the sixth cover plate 13 , and the sixth pressing rod 12 drives the outer shell 16 to be squeezed toward the sealing body 15 , so that the sealing body 15 is located at a third depth of the outer shell 16 .

[0091] During operation, the first cover plate 3 seals the opening corresponding to the first open end of the accommodating mechanism 1, and the second cover plate 9 seals the opening corresponding to the second open end of the accommodating mechanism 1 to seal the accommodating mechanism 1, and the accommodating mechanism 1 is vacuumed for the first time to make the accommodating mechanism 1 in a negative pressure state, and the first pressure rod 2 drives the sealing body 15 to be squeezed toward the direction of the outer shell 16, and the second pressure rod 4 drives the outer shell 16 to be squeezed toward the direction of the sealing body 15, and the sealing body 15 seals the inner cavity of the outer shell 16, and switches the negative pressure state of the inner cavity of the accommodating mechanism 1 to the atmospheric pressure state. At this time, the inner cavity of the outer shell 16 is in a negative pressure state, and the atmospheric pressure and the first pressure rod 2 can push the sealing body 15 to be squeezed toward the bottom of the outer shell 16. When the sealing body 15 reaches a first depth relative to the outer shell 16, the first pressure rod 2, the first cover plate 3, the second pressure rod 4 and the second cover plate 9 move away from the outer shell 16 to transport the accommodating mechanism 1 to the next pressing station.

[0092] The third cover plate 7 seals the opening corresponding to the first open end of the accommodating mechanism 1, and the fourth cover plate 9 seals the opening corresponding to the second open end of the accommodating mechanism 1 to seal the accommodating mechanism 1, and the accommodating mechanism 1 is evacuated for the second time to make the accommodating mechanism 1 in a negative pressure state again. When the third pressure rod 6 drives the sealing body 15 to be squeezed toward the direction of the outer shell 16, the inner cavity of the accommodating mechanism 1 is switched to atmospheric pressure. The atmospheric pressure and the third pressure rod 6 can push the sealing body 15 to be squeezed toward the bottom of the outer shell 16. After the sealing body 15 is located at the second depth of the outer shell 16, the third pressure rod 6, the third cover plate 7 and the fourth cover plate 9 are all away from the outer shell 16, and the accommodating mechanism 1 is transported to the secondary pressing station.

[0093] The fifth cover plate 11 seals the opening corresponding to the first open end of the accommodating mechanism 1, and the sixth cover plate 13 seals the opening corresponding to the second open end of the accommodating mechanism 1 to seal the accommodating mechanism 1. The accommodating mechanism 1 is evacuated for the third time to make the accommodating mechanism 1 in a negative pressure state again. When the fifth pressure rod 10 drives the sealing body 15 to be squeezed toward the direction of the outer shell 16, the inner cavity of the accommodating mechanism 1 is switched to atmospheric pressure. The atmospheric pressure and the fifth pressure rod 10 can push the sealing body 15 to be squeezed toward the bottom of the outer shell 16. After the sealing body 15 is located at the third depth of the outer shell 16, the fifth cover plate 11, the fifth pressure rod 10, and the sixth cover plate 13 are all away from the outer shell 16, completing the negative pressure packaging of the aluminum electrolytic capacitor, and obtaining an aluminum electrolytic capacitor in an internal negative pressure state.

[0094] Further, S600, the step of performing secondary pressing on the sealing body 15 and the outer shell 16 so that the sealing body 15 is located at a third depth of the outer shell 16, and the third depth is closer to the bottom end of the outer shell 16 relative to the second depth also includes:

[0095] S700 , performing a waisting treatment on the sealing portion of the outer shell 16 , thereby reducing the diameter of the sealing portion of the outer shell 16 and increasing the airtightness between the sealing body 15 and the outer shell 16 .

[0096] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A negative pressure packaging method for an aluminum electrolytic capacitor, characterized in that: The steps include: S100, inserting the element core into the sealing body; S200, placing the element core, the sealing body and the outer shell in the inner cavity of the accommodating mechanism, and sealing the accommodating mechanism; S300, evacuating the inner cavity of the accommodating mechanism to place the inner cavity of the accommodating mechanism in a negative pressure state; S400, encapsulating the sealing body and the shell so that the sealing body is located at a first depth of the shell; S500, pressing the sealing body and the outer shell together so that the sealing body is located at a second depth of the outer shell, and the second depth is closer to the bottom end of the outer shell than the first depth; The steps of placing the element core, the sealing body and the outer shell in the inner cavity of the accommodating mechanism and sealing the accommodating mechanism include: S210, placing the sealing body and the shell in the inner cavity of the accommodating mechanism, wherein the accommodating mechanism has a first opening end and a second opening end opposite to the first opening end; S220, moving the first cover plate toward the first opening end to close to and seal the opening corresponding to the first opening end, moving the second cover plate toward the second opening end to close to and seal the opening corresponding to the second opening end, thereby sealing the accommodating mechanism; The step of encapsulating the sealing body and the shell so that the sealing body is located at a first depth of the shell comprises: S410: A first pressing rod is disposed through the first cover plate, and the first pressing rod drives the sealing body to be pressed toward the outer shell; S420, a second pressing rod is disposed through the second cover plate, and the second pressing rod drives the outer shell to be pressed toward the sealing body, so that the sealing body is located at a first depth of the outer shell; The first pressure rod is disposed through the first cover plate, and the step of the first pressure rod driving the sealing body to be pressed toward the outer shell includes: S411, the first pressure rod is disposed through the first cover plate, and the first pressure rod drives the sealing body to approach the outer shell, so that the sealing body seals the outer shell; S412, switching the negative pressure state of the inner cavity of the accommodating mechanism to the atmospheric pressure state; S413: The first pressing rod applies a force to the sealing body toward the bottom of the shell to drive the sealing body to be located at a first depth of the shell.

2. The negative pressure packaging method according to claim 1, characterized in that: The step of pressing the sealing body and the shell so that the sealing body is located at a second depth of the shell, wherein the second depth is closer to the bottom of the shell than the first depth, comprises: S501, when the sealing body is located at a first depth of the shell, the first pressure rod and the first cover plate move in a direction away from the sealing body, and the second pressure rod and the second cover plate move in a direction away from the shell; S502, transporting the accommodating mechanism to the next pressing station.

3. The negative pressure packaging method according to claim 1, characterized in that: The step of pressing the sealing body and the shell together so that the sealing body is located at a second depth of the shell, wherein the second depth is closer to the bottom of the shell than the first depth, comprises: S510, the third cover plate seals the opening corresponding to the first opening end of the accommodating mechanism, and the fourth cover plate seals the opening corresponding to the second opening end of the accommodating mechanism, so as to seal the accommodating mechanism; S520: A third pressing rod is disposed through the third cover plate, and the third pressing rod drives the sealing body to be pressed toward the outer shell; S530: A fourth pressing rod is disposed through the fourth cover plate, and the fourth pressing rod drives the outer shell to be pressed toward the sealing body, so that the sealing body is located at a second depth of the outer shell.

4. The negative pressure packaging method according to claim 2, characterized in that: The third pressure rod is disposed through the third cover plate, and the step of the third pressure rod driving the sealing body to be pressed toward the outer shell further includes: The negative pressure state of the inner cavity of the accommodating mechanism is switched to the atmospheric pressure state.

5. The negative pressure packaging method according to claim 1, characterized in that: The step of pressing the sealing body and the shell together so that the sealing body is located at a second depth of the shell, wherein the second depth is closer to the bottom of the shell than the first depth, further comprises: The sealing body and the outer shell are pressed together for a second time, so that the sealing body is located at a third depth of the outer shell, and the third depth is closer to the bottom end of the outer shell than the second depth.

6. The negative pressure packaging method according to claim 5, characterized in that: The step of performing secondary pressing on the sealing body and the shell so that the sealing body is located at a third depth of the shell, wherein the third depth is closer to the bottom end of the shell relative to the second depth, comprises: S610, the fifth cover plate seals the opening corresponding to the first opening end of the accommodating mechanism, and the sixth cover plate seals the opening corresponding to the second opening end of the accommodating mechanism, so as to seal the accommodating mechanism; S620: A fifth pressing rod is disposed through the fifth cover plate, and the fifth pressing rod drives the sealing body to be pressed toward the outer shell; S630: A sixth pressing rod is disposed through the sixth cover plate, and the sixth pressing rod drives the outer shell to be squeezed toward the sealing body, so that the sealing body is located at a third depth of the outer shell.

7. The negative pressure packaging method according to claim 5, characterized in that: The step of performing secondary pressing on the sealing body and the shell so that the sealing body is located at a third depth of the shell, wherein the third depth is closer to the bottom end of the shell than the second depth, further comprises: A waist treatment is performed at the seal of the shell.

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