Anti-vibration and anti-impact electrolytic capacitor and production method of capacitor housing

Abstract

The application discloses an anti-vibration and anti-impact electrolytic capacitor and a production method of a capacitor shell, and relates to the technical field of electrolytic capacitors. The shell is longitudinally symmetrically provided with an even number of pairs of outer concave and inner convex anti-impact ribs, and the number of the anti-impact ribs is not less than four; an element is arranged in the inner cavity of the shell and clamped by the anti-impact ribs; a sealing rubber plug is arranged on the upper end opening of the shell; the element extends out to connect a lead wire which extends to the outside of the shell through the sealing rubber plug; the arrangement of the anti-impact ribs increases the rigidity of the shell, so that the deformation of the shell and the element in the shell is reduced when the shell and the element are subjected to impact force; the element is in uniform stress contact with the anti-impact ribs in the shell, the element is not easy to shake in the shell under the action of vibration and impact force, and the risk of extrusion deformation of the element and lead wire falling off is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of capacitors, and particularly relates to an anti-vibration and anti-impact electrolytic capacitor and a capacitor shell production method. BACKGROUND

[0002] In an industrial electronic digital detonator, energy released by an energy storage capacitor is provided to a control device and an ignition device. The energy storage capacitor is an extremely important element in a digital electronic detonator. At present, in the industry, the market share of tantalum electrolytic capacitors is relatively high. Although existing aluminum electrolytic capacitors have an advantage in price compared with tantalum electrolytic capacitors, the aluminum electrolytic capacitors cannot well replace the tantalum electrolytic capacitors with a relatively high price because of the problem of insufficient anti-impact capability. According to research, in small-section blasting in a tunnel, hard rock, and underground mining and tunneling, under the action of strong vibration and impact, an electronic detonator may appear sympathetic detonation, damage and refusal to detonate, and temporary failure and refusal to detonate. Temporary failure is caused by charge leakage of an energy storage capacitor in a chip module under the action of an impact wave, resulting in a phenomenon that residual voltage is lower than a primer firing voltage and causes detonation refusal. According to analysis, the main reason for the decrease of the voltage of the energy storage capacitor is that the internal element of the electrolytic capacitor is deviated due to impact, resulting in charge loss. Or the sharp edge of a connecting piece terminal pierces electrolytic paper when the electrolytic capacitor is impacted, causing temporary short circuit of the connecting piece terminal and the anode foil or the cathode foil, resulting in charge leakage or damage and failure.

[0003] Similarly, many electrolytic capacitors are also used in the current automobile field. During automobile driving, bumps are often encountered, so the electrolytic capacitors are often subjected to vibration and impact, and the capacitors are damaged and fail. SUMMARY

[0004] The application aims to provide an anti-vibration and anti-impact electrolytic capacitor and a capacitor shell production method to solve the problems in the background.

[0005] To achieve the above-mentioned purpose, the application provides the following technical scheme.

[0006] An anti-vibration and anti-impact electrolytic capacitor comprises a shell. An even number of pairs of anti-impact ribs are symmetrically arranged on the longitudinal wall of the shell, and the number of the anti-impact ribs is not less than four. An element is placed in the inner cavity of the shell, and the anti-impact ribs clamp the element. A sealing rubber plug is arranged at the upper end opening of the shell. The element extends out of the connecting lead, passes through the sealing rubber plug, and extends to the outside of the shell.

[0007] In a further technical scheme, one end of the anti-impact rib close to the opening gradually inclines to the inner cavity of the shell in the direction of the bottom, so that the circumference enclosed by the anti-impact ribs at the lower part of the shell is smaller than the circumference enclosed by the anti-impact ribs at the upper part of the shell.

[0008] Further technical solutions, the number of the anti-impact ribs is four, which are evenly distributed on the peripheral wall of the shell.

[0009] Further technical solutions, the length of the anti-impact rib is less than or equal to the length of the element.

[0010] Further technical solutions, the cross section of the element is oval, the end of the long diameter of the element abuts against the inner wall of the shell and is located between the two anti-impact ribs, and the outer periphery on both sides of the end of the long diameter abuts against the anti-impact rib.

[0011] Further technical solutions, the element comprises an anode foil and a cathode foil, the anode foil is connected with a positive connecting sheet terminal, the positive connecting sheet terminal is connected with a positive lead wire, the cathode foil is connected with a negative connecting sheet terminal, the negative connecting sheet terminal is connected with a negative lead wire, and electrolytic paper is clamped between the anode foil and the cathode foil.

[0012] Further technical solutions, the side surface of the positive connecting sheet terminal and the negative connecting sheet terminal is provided with a plurality of acute angle edges, and the acute angle edges in contact with the electrolytic paper correspond to the junctions of the anti-impact ribs and the shell.

[0013] Further technical solutions, the sealing rubber plug is made of a high polymer polymer vibration-absorbing material.

[0014] Further technical solutions, the sealing rubber plug comprises a sealing part and a contact part, the sealing part is arranged in the shell to seal the opening, and the contact part extends out of the shell.

[0015] A capacitor shell production method comprises a metal material belt;

[0016] In the second step, a plurality of circular blanks are placed in a mixer, and a nano solid lubricant is added for stirring;

[0017] In the third step, the circular center blank fully lubricated is taken out and sequentially sent into a cup punching machine, so that the circular blank is punched into a single-side opening cylindrical punch once, and the end face of the cylindrical punch is formed with a jet flow groove;

[0018] In the fourth step, the cylindrical blank is punched for the second time, so that the outer concave and inner convex anti-impact rib is formed on the peripheral wall of the cylindrical blank, and the port of the concave and convex surface of the anti-impact rib is processed into a metal deformation rheological surface;

[0019] In the fifth step, the opening position is trimmed, so that the opening becomes flush, and the capacitor metal shell is formed;

[0020] In the sixth step, the capacitor shell is cleaned and finally dried.

[0021] The beneficial effects of the present application are as follows:

[0022] 1. The setting of the anti-impact rib increases the stiffness of the shell, so that the shell and the element in the shell are less deformed when subjected to impact force, and the element is uniformly stressed by the anti-impact rib in the shell, and the element in the shell is not easy to shake under the action of vibration and impact force, reducing the risk of element deformation and lead disconnection.

[0023] 2. The element is in the shape of an ellipse, and when the element is placed in the cavity of the shell, the long diameter direction of the element section is located between the two anti-impact ribs, and the two ends thereof are respectively abutted against the inner wall of the shell, and the element has a certain extrusion deformation, so that the element is embedded in the shell, at this time, the anti-impact ribs on both sides of the long diameter end are abutted against the outer periphery of the element, and a clamping state is formed, realizing the fixation of the element and limiting the shaking of the element in the shell.

[0024] 3. Due to the placement of the long diameter direction of the elliptical element between the two anti-vibration ribs, a gap is formed between the junction of the anti-impact rib and the shell and the element, so that the acute angle edges of the positive and negative connecting piece terminals correspond to the gap, and when impacted, the gap provides a deformation space for the element, reducing the risk of charge leakage or damage due to piercing of the electrolytic paper.

[0025] 4. The sealing plug made of vibration-absorbing material contacts the printed circuit board at the abutting portion of the sealing plug when the electrolytic capacitor is vertically installed, and the sealing plug converts the impact mechanical energy transmitted by the abutting portion and the lead of the electrolytic capacitor into heat energy and dissipates it, reducing the impact energy. At the same time, due to the fact that the connecting piece through hole of the sealing portion of the sealing plug is larger than the lead through hole of the abutting portion, the sealing performance is improved.

[0026] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The capacitor of the present application is shown in the perspective view.

[0028] Figure 2 The longitudinal section view of the capacitor of the present application is shown.

[0029] Figure 3 The longitudinal section view of the shell of the present application is shown.

[0030] Figure 4 The internal structure of the element of the present application is shown.

[0031] Figure 5 The transverse section view of the capacitor of the present application is shown.

[0032] Figure 6 The section view of the sealing plug of the present application is shown.

[0033] Figure 7 The connection diagram of the straight insertion type capacitor of the present application and the printed circuit board is shown.

[0034] Figure 8 Fig. 1 is a schematic view of a patch capacitor of the present application connected to a printed circuit board.

[0035] Figure 9 Fig. 2 is a flow chart of a method for producing a housing of the present application.

[0036] Reference numerals: 1 - housing, 11 - impact-resistant rib, 2 - element, 21 - anode foil, 22 - cathode foil, 23 - positive tab terminal, 24 - negative tab terminal, 25 - electrolytic paper, 26 - positive lead wire, 27 - negative lead wire, 28 - acute angle edge, 29 - adhesive tape, 3 - sealing plug, 31 - sealing portion, 32 - abutting portion, 33 - tab terminal through hole, 34 - lead wire through hole, 4 - printed circuit board. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

[0038] Please refer to Figures 1-8 ;

[0039] The capacitor described in the present application can withstand a large impact without causing leakage of capacitor charge or damage and failure. The movement of the element 2 is well limited by the fixing structure in the housing 1, which specifically includes the housing 1 and the element 2. The peripheral wall of the housing 1 is formed with a plurality of outwardly concave and inwardly convex impact-resistant ribs 11 distributed symmetrically in the longitudinal direction by stamping. Then, the element 2 is inserted into the inner cavity of the housing 1, and the outer diameter of the element 2 should be greater than or equal to the diameter of the space surrounded by the protruding ends of the plurality of impact-resistant ribs 11. Therefore, after the element 2 is inserted into the inner cavity of the housing 1, its outer wall will be clamped by the plurality of impact-resistant ribs 11. Further, the number of impact-resistant ribs 11 is even pairs, and the number is not less than four, specifically four, six or eight, etc. The impact-resistant ribs 11 are distributed in a ring array, so that the element 2 is in contact with the impact-resistant ribs 11 in the housing 1 and is uniformly stressed. At the same time, the arrangement of the impact-resistant ribs 11 increases the stiffness of the housing 1, so that the deformation of the housing 1 and the element 2 under impact force is reduced. Under the action of vibration and impact force, the element 2 in the aluminum shell is not easy to shake, and the risk of extrusion deformation and lead wire falling off of the element 2 is reduced.

[0040] In the embodiment, the opening of the shell 1 is the upper end, the impact-resistant rib 11 extends from the lower end of the shell 1 to the opening direction, preferably, the length of the impact-resistant rib 11 is less than or equal to the length of the element 2, and the end of the impact-resistant rib 11 close to the opening gradually inclines to the bottom of the shell 1, that is, the protrusion amount of the impact-resistant rib 11 close to the opening to the inner cavity of the shell 1 is less than the protrusion height of the impact-resistant rib 11 to the inner cavity of the shell 1 at the bottom, and from the outside, the groove depth of the shell 1 peripheral wall gradually increases from top to bottom, so that the circumference surrounded by the several impact-resistant ribs 11 at the lower part of the shell 1 is less than the circumference surrounded by the several impact-resistant ribs 11 at the upper part of the shell 1, that is, the several impact-resistant ribs 11 in the inner cavity of the shell 1 surround a space with taper, preferably, the inclination angle of the impact-resistant rib 11 is 1°-2°, when the element 2 is inserted into the inner cavity of the shell 1, the taper space can gradually extrude the peripheral wall of the element 2, further fix the relative position between the element 2 and the shell 1, and the fixing effect is better.

[0041] In one of the embodiments of the application, the number of impact-resistant ribs 11 is four, the element 2 in the embodiment is different from the element shape used in the existing electrolytic capacitor, the element in the application is approximately elliptical in cross section, that is, the shape is approximately elliptical, when the element 2 is placed in the inner cavity of the shell 1, the long diameter direction of the elliptical element 2 is located between the two impact-resistant ribs 11, and the two ends thereof are respectively in contact with the inner wall of the shell 1, and the element 2 has a certain extrusion deformation, so that the element 2 is embedded in the shell 1, at this time, the impact-resistant ribs 11 on both sides of the long diameter end are in contact with the outer circumference of the element 2, and a clamping state is formed, so that the element 2 is fixed and limited to shake in the shell 1;

[0042] The formation of the element 2 is described below;

[0043] The element 2 comprises an anode foil 21 and a cathode foil 22, the anode foil 21 is connected with a positive connecting tab terminal 23 by riveting, the positive connecting tab terminal 23 is riveted to lead out a positive electrode lead wire 26, the cathode foil 22 is connected with a negative connecting tab terminal 24 by riveting, the negative connecting tab terminal 24 is riveted to lead out a negative electrode lead wire 27, an electrolytic paper 25 is clamped between the anode foil 21 and the cathode foil 22, the anode foil 21, the cathode foil 22 and the electrolytic paper 25 are co-wound, and finally fixed by a tape 29; the positive connecting tab terminal 23 and the negative connecting tab terminal 24 in the embodiment are sheet-shaped metals with a certain width, so that the winding distance between the positive connecting tab terminal 23 and the negative connecting tab terminal 24 is lengthened when the element 2 is co-wound, and the cross section of the element 2 formed in this way is oval-shaped, since the positive connecting tab terminal 23 and the negative connecting tab terminal 24 are sheet-shaped metals with a certain width, the side surface of the positive connecting tab terminal 23 and the negative connecting tab terminal 24 is provided with a plurality of acute edges 28, the acute edges 28 are relatively sharp from the cross-sectional view, and only the thin electrolytic paper 25 is arranged between the anode foil 21 and the cathode foil 22, so that the acute edges 28 are easy to pierce the electrolytic paper 25 when the element 2 is impacted by external force, and the anode foil 21 and the cathode foil 22 are connected to cause the charge leakage or damage of the electrolytic capacitor;

[0044] Based on the above embodiment, since the plurality of impact-resistant ribs 11 are arranged, the positions where the acute edges 28 of the positive connecting tab terminal 23 and the negative connecting tab terminal 24 are easy to pierce the electrolytic paper 25 correspond to the positions where the impact-resistant ribs 11 and the shell 1 meet, since the oval-shaped element 2 is placed in the long diameter direction between the two impact-resistant ribs 11, the positions where the impact-resistant ribs 11 and the shell 1 meet and the element 2 form gaps, and the acute edges 28 of the positive connecting tab terminal 23 and the negative connecting tab terminal 24 correspond to the gaps, when impacted, the gaps provide deformation space for the element 2, so that the acute edges 28 are not easy to pierce the electrolytic paper, the risk of short circuit between the positive connecting tab terminal 23 and the negative connecting tab terminal 24 and the anode foil 21 and the cathode foil 22 can be reduced, and the risk of causing the charge leakage or damage of the electrolytic capacitor can be avoided, based on the above embodiment, the gaps between the positions where the impact-resistant ribs 11 and the shell 1 meet and the element 2 also provide certain deformation space for the thermal expansion and contraction of the electrolytic capacitor element, and also provide certain deformation space for the shaking of the element 2.

[0045] The electrolytic capacitor is formed by sealing the element 2 in the shell 1, so the upper end of the shell 1 is provided with a sealing plug 3, and the two element 2 extension connection leads pass through the sealing plug 3 and extend to the outside of the shell 1, in the embodiment, the sealing plug 3 is made of a shock absorbing material, which can be one of butyl rubber, neoprene rubber, polyurethane rubber and ethylene-propylene-diene rubber, preferably butyl rubber; further, the sealing plug 3 in the embodiment is composed of a sealing part 31 inserted into the cavity of the shell 1 and a contact part 32 extending to the outside of the shell 1, the sealing part 31 is provided with a tab through hole 33 for the positive tab terminal 23 and the negative tab terminal 24 to pass through, and the contact part 32 is provided with a lead through hole 34 in communication with the tab through hole 33, the space of the lead through hole 34 is smaller than the diameter of the tab through hole 33, so that the sealing of the electrolytic capacitor in the lead direction is enhanced, and the service life of the electrolytic capacitor is improved;

[0046] In addition, when the capacitor welded on the PCB carrier plate is impacted and vibrated, the energy is transmitted to the sealing plug 3 made of shock absorbing material through the positive lead 26 and the negative lead 27, the sealing plug 3 dissipates the absorbed energy in the form of heat, reduces the impact and vibration energy of the lead, and well meets the requirements of automobile electronics and other applications with high requirements for shock resistance, expands the application field and market share of the electrolytic capacitor, and brings economic benefits to the enterprise.

[0047] The structure based on the above embodiment can correspond to produce a straight insertion type electrolytic capacitor and a vertical surface mount electrolytic capacitor, the difference between the two is only the number, appearance and connection mode of the impact resistant rib 11 on the shell 1, and the structure of the shell 1, the element 2 and the sealing plug 3 is completely the same, when the straight insertion type capacitor and the surface mount capacitor are installed on the printed circuit board 4, referring to Figure 7 and Figure 8 , the contact part 32 of the sealing plug 3 contacts the printed circuit board 4, and the impact energy transmitted by the printed circuit board 4 is partially converted into heat and dissipated by using the shock absorbing material of the sealing plug, so that the impact energy acting on the electrolytic capacitor is reduced.

[0048] The application also discloses a capacitor shell production method, referring to Figure 9 , including a metal material belt, preferably a metal aluminum belt;

[0049] Firstly, the metal material belt is punched to form a plurality of circular blanks;

[0050] Secondly, the plurality of circular blanks are put into a blender and lubricant is added for stirring, preferably a nano solid lubricant, and in the embodiment, the lubricant is in powder form;

[0051] Thirdly, the well-lubricated round blank is taken out and put into a sheet feeder, and then is sent into a cup punching machine to punch the round blank into a single-side opening cylindrical shape. In this embodiment, the end of the punch used for punching the round blank has a number of micro-concave-convex surfaces to form a jet groove, so that the blank is punched into a single-side opening cylindrical shape at one time.

[0052] Fourthly, the cylindrical blank is punched for the second time to form an anti-impact rib 11 on the peripheral wall of the cylindrical blank. In this embodiment, the end surface of the concave-convex surface is processed into a metal deformation flow surface. In the fifth step, the opening position is trimmed to make the opening flush, so that the capacitor metal shell 1 is formed.

[0053] In the sixth step, the capacitor shell 1 is cleaned and finally is dried.

[0054] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to include all changes falling within the meaning and range of equivalents of the claims. Any reference signs in the claims should not be considered as limiting the claims involved.

[0055] The above description is only the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A vibration- and shock-resistant electrolytic capacitor, comprising a housing (1), characterized in that: The shell (1) has an even number of pairs of concave and convex impact-resistant ribs (11) symmetrically arranged longitudinally on its periphery, and the number of such ribs is not less than four. A component (2) is placed in the inner cavity of the shell (1). The impact-resistant ribs (11) hold the component (2). The upper opening of the shell (1) is provided with a sealing plug (3). The component (2) extends out a connecting lead through the sealing plug (3) and extends to the outside of the shell (1). The cross-section of the element (2) is elliptical. The end of the long diameter of the element (2) abuts against the inner wall of the shell (1) and is located between two impact ribs (11). The outer periphery on both sides of the end of the long diameter of the element (2) abuts against the impact ribs (11). The element (2) includes an anode foil (21) and a cathode foil (22). The anode foil (21) is connected to a positive connecting plate terminal (23), and the positive connecting plate terminal (23) is connected to a positive lead (26). The cathode foil (22) is connected to a negative connecting plate terminal (24), and the negative connecting plate terminal (24) is connected to a negative lead (27). Electrolytic paper (25) is sandwiched between the anode foil (21) and the cathode foil (22). The positive connecting plate terminal (23) and the negative connecting plate terminal (24) each have several acute angle edges (28) on their sides. The acute angle edges (28) that contact the electrolytic paper (25) correspond to the junction of the impact rib (11) and the shell (1). The elliptical element is placed between two anti-vibration ribs along its long diameter, creating a gap between the impact-resistant ribs and the shell and the element. The acute edges of the positive and negative connecting plates correspond to this gap. When subjected to impact, this gap provides deformation space for the element, making it less likely for the acute edges to puncture the electrolytic paper. This reduces the risk of short circuits between the positive and negative electrode terminals and the anode and cathode foils, thus avoiding the risk of charge leakage or damage to the electrolytic capacitor. The gap between the anti-vibration ribs and the element at the shell interface also provides deformation space for the electrolytic capacitor element to expand and contract with temperature.

2. The vibration-resistant and shock-resistant electrolytic capacitor according to claim 1, characterized in that: The impact-resistant rib (11) is inclined towards the bottom of the inner cavity of the shell (1) at the end near the opening, so that the perimeter of the several impact-resistant ribs (11) in the lower part of the shell (1) is smaller than the perimeter of the several impact-resistant ribs (11) in the upper part of the shell (1).

3. The vibration-resistant and shock-resistant electrolytic capacitor according to claim 1, characterized in that: The number of impact-resistant ribs (11) is four, which are evenly distributed on the periphery of the shell (1).

4. The vibration-resistant and shock-resistant electrolytic capacitor according to claim 1, characterized in that: The length of the impact-resistant rib (11) is less than or equal to the length of the element (2).

5. The vibration-resistant and shock-resistant electrolytic capacitor according to claim 1, characterized in that: The sealing plug (3) is made of a high molecular polymer vibration-absorbing material.

6. The vibration-resistant and shock-resistant electrolytic capacitor according to claim 1, characterized in that: The sealing plug (3) includes a sealing part (31) and an abutting part (32). The sealing part (31) is placed inside the housing (1) to seal the opening, and the abutting part (32) extends out of the housing (1).

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