Safe solid electrolytic capacitor
By designing crack-proof grooves on the aluminum shell of the capacitor and combining the design of the insulating adhesive layer and heat conducting sheet, the problem of insufficient housing strength during heating and bulging of the capacitor is solved, achieving more efficient heat dissipation and safer use.
Patent Information
- Application Number
- CN202420593136.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-03-26
AI Technical Summary
When existing capacitors are unstable in voltage, the strength of the aluminum shell is limited and easy to crack, resulting in loss of protection of the capacitor core, abnormal circuit, insufficient heat dissipation effect, and shortened service life.
A safe solid-state electrolytic capacitor is designed, with a shell made of aluminum, and a crack-proof groove is provided at the center of the upper surface of the shell, a capacitor core and an insulating adhesive layer are provided inside, and a heat conductor sheet is placed on the upper part of the capacitor core. The through holes and conductor grooves are designed to facilitate heat dissipation and prevent bloating.
The design of anti-crack grooves prevents excessive cracking of the outer shell, ensures that the capacitor core is protected, the insulating adhesive layer reduces heat conduction gaps, and the heat conduction sheet improves heat dissipation effect, extends the service life of the capacitor, and improves its high temperature resistance and enhances safety.
Smart Images
Figure CN222580971U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of capacitors, in particular to a safe solid electrolytic capacitor. Background Art
[0002] Capacitors are the most frequently used devices in electronic devices. During the use of capacitors, the unstable voltage will cause the capacitor to heat up, which will lead to excessive internal pressure and bulging. At the same time, it will accelerate the aging of the capacitor's insulating medium, resulting in a shortened service life of the capacitor.
[0003] In the related art, an aluminum shell is generally used for heat dissipation of the capacitor, and the high thermal conductivity of the aluminum shell is used to prevent the capacitor from overheating. However, the strength of the aluminum shell is limited. When the voltage is unstable and the capacitor heats up and bulges, the aluminum shell will crack. At this time, the capacitor core loses the protection of the aluminum shell, causing circuit abnormalities. The safety redundancy of the capacitor needs to be improved. Utility Model Content
[0004] The purpose of the utility model is to provide a safe solid electrolytic capacitor to solve the problems raised in the above background technology.
[0005] To achieve the above object, the utility model provides the following technical solution: a safe solid electrolytic capacitor, comprising a shell, a crack prevention groove is provided at the center of the upper surface of the shell, a capacitor core is provided inside the shell, the surface of the capacitor core is wrapped with an insulating rubber layer, and the shell is sleeved on the surface of the insulating rubber layer;
[0006] The shell is made of aluminum, which can improve the heat dissipation capacity of the capacitor. When the capacitor bulges, the anti-crack groove can prevent other parts of the shell from cracking. The anti-crack groove breaks first to ensure that the shell can still protect the capacitor core. The insulating rubber layer can prevent the shell from being charged.
[0007] A heat conducting sheet, which is placed on the upper part of the capacitor core and inside the shell. A conduction hole and a plurality of conduction grooves are provided on the surface of the heat conducting sheet, and the conduction grooves are connected to the conduction holes. The conduction holes are located below the anti-crack grooves. The heat conducting sheet cooperates with the shell to dissipate heat from the capacitor core, and avoid overheating when the capacitor core is in normal use;
[0008] The sealing seat is placed inside the shell and below the insulating rubber layer. A reinforcement ring is provided at the lower part of the shell surface. The reinforcement ring is sunk into the surface of the sealing seat. The sealing seat cooperates with the shell to realize the packaging of the capacitor core.
[0009] Furthermore, an insulating seat is installed at the lower end of the shell, a fixing groove is provided on the surface of the insulating seat, and the insulating seat is placed inside the fixing groove. The insulating seat can prevent the shell from contacting the circuit board, thereby avoiding leakage and short circuit problems.
[0010] Furthermore, a receiving hole is provided on the lower surface of the insulating seat, a rubber pad is connected in the receiving hole, and the rubber pad protrudes downward from the receiving hole, and an adhesive layer is provided on the surface of the rubber pad, and the adhesive layer is bonded to the receiving hole. The rubber pad can achieve flexible contact between the insulating seat and the circuit board to prevent the circuit board from being worn. If the rubber pad affects the welding of the capacitor and the circuit board, the rubber pad can be removed under the action of the adhesive layer.
[0011] Furthermore, a fixing column is provided on the upper surface of the insulating seat, and a socket is provided on the surface of the sealing seat. The fixing column is inserted into the socket to improve the stability of the connection between the insulating seat and the sealing seat, and improve the stability of the capacitor after packaging.
[0012] Compared with the prior art, the beneficial effects of the utility model are:
[0013] (1) The heat dissipation capacity of the capacitor is improved through the shell and the heat conductive sheet, thereby improving the capacitor's ability to resist high temperatures. When the voltage is unstable and causes the capacitor to heat up and swell, the anti-crack groove on the upper surface of the shell will crack first to prevent the shell from cracking excessively, ensuring that the capacitor core is still wrapped by the shell, preventing circuit abnormalities, and making the capacitor safer.
[0014] (2) The outer shell and the capacitor core are separated by an insulating rubber layer. There are fewer gaps between the insulating rubber layer and the outer shell, the capacitor core and the thermal conductive sheet, and the heat conduction effect is better. The heat generated by the capacitor core can be transferred to the outer shell faster and dissipated into the air.
[0015] (3) The insulating seat prevents the housing from contacting the circuit board and other electronic components, thus preventing short circuit problems in the circuit. When the capacitor is soldered to the circuit board, the stability of the circuit board is better. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0017] Figure 2 It is a top view of the utility model;
[0018] Figure 3 This is a schematic diagram of the structure of the connection between the pin and the receiving groove of the utility model;
[0019] Figure 4 It is a cross-sectional view of the utility model;
[0020] Figure 5 It is a schematic diagram of the structure of the heat conducting sheet of the utility model.
[0021] In the figure: 1. Shell; 2. Insulating seat; 3. Pin; 4. Rubber pad; 5. Anti-crack groove; 6. Fixing groove; 7. Receiving groove; 8. Receiving hole; 9. Insulating rubber layer; 10. Anode foil; 11. Electrolytic paper; 12. Socket; 13. Fixing column; 14. Sealing seat; 15. Adhesive layer; 16. Through hole; 17. Heat conducting sheet; 18. Through groove; 19. Reinforcement ring; 20. Cathode foil. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] Example:
[0024] See also Figure 1-5 The utility model provides a technical solution: a safe solid electrolytic capacitor, comprising a shell 1, a crack prevention groove 5 is provided at the center of the upper surface of the shell 1, a capacitor core is provided inside the shell 1, the surface of the capacitor core is wrapped with an insulating rubber layer 9, and the shell 1 is sleeved on the surface of the insulating rubber layer 9;
[0025] The shell 1 is made of aluminum, and the anti-crack groove 5 is formed by grinding the shell 1 thin, so that the thickness of the anti-crack groove 5 is smaller than the thickness of other parts of the shell 1, ensuring that the anti-crack groove 5 is cracked before other parts of the shell 1, and the insulating rubber layer 9 prevents the capacitor core from directly contacting the shell 1. When the capacitor core is energized, the shell 1 will not be energized, thereby avoiding the problem of leakage of the capacitor;
[0026] A heat conducting sheet 17, which is placed on the upper part of the capacitor core and inside the housing 1. A conduction hole 16 and a plurality of conduction grooves 18 are provided on the surface of the heat conducting sheet 17, and the conduction grooves 18 are connected with the conduction holes 16. The conduction holes 16 are located below the anti-crack groove 5. When the capacitor core is overheated and expands, the gas pressure conduction grooves 18 and the conduction holes 16 inside the housing 1 are discharged to the anti-crack groove 5, so that the anti-crack groove 5 is stretched open, thereby preventing the housing 1 from bulging;
[0027] The sealing seat 14 is placed inside the shell 1 and below the insulating rubber layer 9. A reinforcement ring 19 is provided on the lower surface of the shell 1. The reinforcement ring 19 is sunken into the surface of the sealing seat 14. The sealing seat 14 is made of insulating material. The reinforcement ring 19 clamps the sealing seat 14, and the strength of the capacitor package is higher.
[0028] In this embodiment, if Figure 4As shown, the capacitor core includes an anode foil 10, a cathode foil 20 and an electrolytic paper 11, and the anode foil 10 and the cathode foil 20 are attached to and wound with the electrolytic paper 11, so that the capacitor core is placed inside the housing 1 and the capacitor is arranged in a cylindrical shape.
[0029] In this embodiment, if Figure 1 and Figure 2 As shown, an insulating seat 2 is installed at the lower end of the shell 1, and a fixing groove 6 is provided on the surface of the insulating seat 2. The insulating seat 2 is placed inside the fixing groove 6. The insulating seat 2 is made of plastic. The capacitor is installed on the circuit board to prevent the shell 1 from directly contacting the circuit board and components such as resistors, inductors, and diodes on the circuit board.
[0030] In this embodiment, if Figure 4 As shown, the capacitor core is connected to two pins 3, and the pins 3 pass through the insulating seat 2 and the sealing seat 14. The pins 3 can be welded on the circuit board to achieve electrical connection between the capacitor and the circuit board.
[0031] In this embodiment, if Figure 3 As shown, the lower surface of the insulating seat 2 is provided with a receiving groove 7, and the pin 3 is folded into the receiving groove 7. The receiving groove 7 can ensure that the pin 3 does not protrude downward from the insulating seat 2, so that the surface of the insulating seat 2 is flat.
[0032] In this embodiment, if Figure 3 and Figure 4 As shown, a receiving hole 8 is provided on the lower surface of the insulating seat 2, and a rubber pad 4 is connected to the receiving hole 8, and the rubber pad 4 protrudes downward from the receiving hole 8. When the circuit board is used in a bumpy environment, the rubber pad 4 can buffer the circuit board and the capacitor to avoid friction between the circuit board and the insulating seat 2.
[0033] In this embodiment, if Figure 4 As shown, an adhesive layer 15 is provided on the surface of the rubber pad 4, and the adhesive layer 15 is bonded to the receiving hole 8 to achieve a detachable connection between the rubber pad 4 and the insulating seat 2. When the rubber pad 4 is not needed, the rubber pad 4 can be removed, which is convenient for manufacturers to select according to needs.
[0034] In this embodiment, if Figure 4 As shown, a fixing column 13 is provided on the upper surface of the insulating seat 2, and a socket 12 is provided on the surface of the sealing seat 14. The fixing column 13 is inserted into the socket 12 to improve the stability of the connection between the insulating seat 2 and the sealing seat 14 and prevent the insulating seat 2 from falling.
[0035] Specifically, when in use, the capacitor is connected to the circuit board through two pins 3, and the insulating seat 2 separates the capacitor and the circuit board to ensure that the shell 1 will not contact the circuit board and other electronic components. The heat generated by the capacitor core is transferred to the shell 1 through the insulating rubber layer 9 and the heat conductive sheet 17. The shell 1 exchanges heat with the air to dissipate the heat of the capacitor. When the voltage on the circuit board is unstable and increases, the capacitor core is heated due to the high voltage. When the medium inside the capacitor is vaporized due to high temperature, the pressure inside the shell 1 breaks the anti-crack groove 5 along the conductive groove 18 and the conductive hole 16 to prevent the shell 1 from bulging and cracking. At this time, the shell 1 and the heat conductive sheet 17 can also wrap the capacitor core, which also protects the capacitor core, making the capacitor safer to use.
[0036] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A safe solid electrolytic capacitor, characterized in that: include: A shell (1), wherein an anti-crack groove (5) is provided at the center of the upper surface of the shell (1), a capacitor core is provided inside the shell (1), the surface of the capacitor core is wrapped with an insulating rubber layer (9), and the shell (1) is sleeved on the surface of the insulating rubber layer (9); A heat conducting sheet (17), the heat conducting sheet (17) being placed on the upper part of the capacitor core and inside the housing (1), the surface of the heat conducting sheet (17) being provided with a conducting hole (16) and a plurality of conducting grooves (18), the conducting grooves (18) being connected to the conducting hole (16), and the conducting hole (16) being located below the anti-crack groove (5); A sealing seat (14) is disposed inside the outer shell (1) and below the insulating rubber layer (9); a reinforcement ring (19) is provided at the lower part of the surface of the outer shell (1); the reinforcement ring (19) is sunken into the surface of the sealing seat (14).
2. A safe solid electrolytic capacitor according to claim 1, characterized in that: The capacitor core comprises an anode foil (10), a cathode foil (20) and electrolytic paper (11), and the anode foil (10), the cathode foil (20) and the electrolytic paper (11) are bonded and wound.
3. A safe solid electrolytic capacitor according to claim 1, characterized in that: An insulating seat (2) is installed at the lower end of the housing (1); a fixing groove (6) is provided on the surface of the insulating seat (2); and the insulating seat (2) is placed inside the fixing groove (6).
4. A safe solid electrolytic capacitor according to claim 3, characterized in that: The capacitor core is connected to two pins (3), and the pins (3) penetrate the insulating seat (2) and the sealing seat (14).
5. A safe solid electrolytic capacitor according to claim 4, characterized in that: The lower surface of the insulating seat (2) is provided with a receiving groove (7), and the pin (3) is folded into the receiving groove (7).
6. A safe solid electrolytic capacitor according to claim 3, characterized in that: The lower surface of the insulating seat (2) is provided with a receiving hole (8), a rubber pad (4) is connected to the receiving hole (8), and the rubber pad (4) protrudes downward from the receiving hole (8).
7. A safe solid electrolytic capacitor according to claim 6, characterized in that: An adhesive layer (15) is provided on the surface of the adhesive pad (4), and the adhesive layer (15) is bonded to the receiving hole (8).
8. The safety solid electrolytic capacitor according to claim 3, characterized in that: The upper surface of the insulating seat (2) is provided with a fixing column (13), the surface of the sealing seat (14) is provided with a socket (12), and the fixing column (13) is inserted into the socket (12).