Explosion-proof aluminum electrolytic capacitor

Abstract

An anti-explosion aluminum electrolytic capacitor comprises a shell and a core bag, the core bag is arranged in the shell in a sealed mode through a rubber plug or a sealing cover plate, and an anti-explosion valve is arranged at the bottom of the shell and is in an 8 shape. According to the anti-explosion valve, the anti-explosion groove is 8-shaped, and when the anti-explosion valve is opened, the situation that the center of the anti-explosion valve is released at a single point is avoided; surface release is adopted instead of surface release, the electrolytic paper is not easy to spray out due to large release area, and meanwhile, the spraying range of the electrolyte is relatively concentrated, so that the problems of short circuit and fire of peripheral components of the circuit board are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to an aluminum electrolytic capacitor, especially to an explosion-proof aluminum electrolytic capacitor. BACKGROUND

[0002] The aluminum electrolytic capacitor is applied in the circuit and is mainly used for tuning, filtering, coupling, bypass, energy conversion and time delay. Because the aluminum electrolytic capacitor contains electrolyte inside, when the circuit appears abnormal condition, the internal electrolyte will appear vaporization expansion, so that the capacitor appears explosion-proof valve action to release internal pressure. The design scheme of the traditional aluminum electrolytic capacitor explosion-proof groove is generally in the shape of "Y" or "cross", and is a center single-point release (see Figure 1 ), when the explosion-proof groove acts, the internal gas release is concentratedly sprayed, and the electrolyte is concentratedly sprayed, which can easily cause the short circuit of the peripheral components of the circuit board or even the fire problem. According to the incomplete statistics of the market quality feedback data of some household appliances, the aluminum electrolytic capacitor causes about 38% of the whole machine fire events (the data is from Capacitors and Their Applications, Chen Yongzhen, Science Press, 2005), and the concentrated spraying can also cause the internal core package electrolytic paper to be sprayed. How to design a better explosion-proof groove to improve the explosion-proof characteristics of the aluminum electrolytic capacitor becomes a difficult problem for capacitor design engineers to think. SUMMARY

[0003] The utility model wants to solve the technical problem of overcoming the prior art, and provides an explosion-proof aluminum electrolytic capacitor, which changes from single-point release to surface release when the explosion-proof valve is opened, so that the possibility of causing fire is reduced.

[0004] To solve the above technical problems, the technical scheme provided by the utility model is as follows: an explosion-proof aluminum electrolytic capacitor, comprising a shell and a core package, the core package is sealed in the shell through a rubber plug or a sealing cover plate, the bottom of the shell is provided with an explosion-proof valve, and the explosion-proof valve is in the shape of "8".

[0005] The explosion-proof aluminum electrolytic capacitor, preferably, the explosion-proof valve comprises an S-shaped explosion-proof groove and a straight-line-shaped explosion-proof groove, and the straight-line-shaped explosion-proof groove and the S-shaped explosion-proof groove intersect at the midpoint of the S-shaped explosion-proof groove.

[0006] The explosion-proof aluminum electrolytic capacitor, preferably, the distance between the two end points of the S-shaped explosion-proof groove is one-half to three-fourths of the diameter of the bottom of the shell.

[0007] The explosion-proof aluminum electrolytic capacitor, preferably, the straight-line-shaped explosion-proof groove divides the S-shaped explosion-proof groove into two center-symmetrical arc-shaped explosion-proof grooves, and the depth of the end point of the arc-shaped explosion-proof groove is less than the depth of the midpoint of the arc-shaped explosion-proof groove.

[0008] Preferably, the depth of the arc-shaped anti-explosion groove end point is half of the depth of the arc-shaped anti-explosion groove middle point.

[0009] Preferably, the depth of the arc-shaped anti-explosion groove end point to the arc-shaped anti-explosion groove middle point is gradually deepened.

[0010] Preferably, the depth of the arc-shaped anti-explosion groove end point to the arc-shaped anti-explosion groove middle point is gradually deepened.

[0011] Compared with the prior art, the anti-explosion groove in the utility model is in the shape of 8, when the explosion valve is opened, the explosion valve will not release in a single point in the center, but release in a plane, because the release area is large, the electrolytic paper is not easy to be ejected, and the ejection range of the electrolyte is relatively concentrated, thereby reducing the short circuit and fire problems of the peripheral components of the circuit board. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the traditional aluminum electrolytic capacitor of the single-point release explosion valve in the background art.

[0013] Figure 2 It is a structural schematic diagram of the aluminum electrolytic capacitor of the explosion-proof in Example 1.

[0014] LEGEND

[0015] 1, shell; 2, explosion valve; 21, S-shaped anti-explosion groove; 211, arc-shaped anti-explosion groove; 22, anti-explosion groove in the shape of a character. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of the utility model, the following will be combined with the description of the drawings and the preferred embodiments to make a more comprehensive and detailed description of the utility model, but the protection scope of the utility model is not limited to the following specific embodiments.

[0017] It should be particularly noted that when a certain element is described as being "fixed to, fixedly connected to, connected to or communicated to" another element, it can be directly fixed, fixedly connected, connected or communicated to another element, or indirectly fixed, fixedly connected, connected or communicated to another element through other intermediate connecting elements.

[0018] Unless otherwise defined, all the professional terms used in the following are the same as the meanings commonly understood by the skilled in the art. The professional terms used in the text are only for the purpose of describing the specific embodiments, and are not intended to limit the protection scope of the utility model. Example 1

[0019] As Figure 2The shown anti-explosion aluminum electrolytic capacitor is a lead type aluminum electrolytic capacitor, comprising a shell 1 and a core package, the core package is sealed in the shell 1 by a rubber plug, the bottom of the shell 1 is provided with an anti-explosion valve 2, the anti-explosion valve 2 is in the shape of 8. The anti-explosion valve 2 in the shape of 8 comprises an S-shaped anti-explosion groove 21 and a straight-shaped anti-explosion groove 22, the straight-shaped anti-explosion groove 22 intersects with the S-shaped anti-explosion groove 21 at the midpoint of the S-shaped anti-explosion groove 21. In this embodiment, the intersection point divides the S-shaped anti-explosion groove 21 and the straight-shaped anti-explosion groove 22 into two parts.

[0020] In this embodiment, the distance between the two endpoints of the S-shaped anti-explosion groove 21 is one half to three quarters of the diameter of the bottom of the shell 1, preferably two thirds.

[0021] In this embodiment, the depth of the straight-shaped anti-explosion groove 22 is 0.1mm.

[0022] In this embodiment, the straight-shaped anti-explosion groove 22 divides the S-shaped anti-explosion groove 21 into two center-symmetrical arc-shaped anti-explosion grooves 211, the depth of the endpoints of the arc-shaped anti-explosion grooves 211 is less than the depth of the midpoint of the arc-shaped anti-explosion grooves 211. In this embodiment, the depth of the endpoints of the arc-shaped anti-explosion grooves 211 and the intersection point is 0.15mm, the depth of the midpoint of the arc-shaped anti-explosion grooves 211 is 0.3mm; the depth gradually increases from the endpoints of the arc-shaped anti-explosion grooves 211 to the midpoint of the arc-shaped anti-explosion grooves 211. In this embodiment, the arc of the arc-shaped anti-explosion grooves is between 150-180°.

[0023] The anti-explosion groove in this embodiment is in the shape of 8, when the anti-explosion valve 2 is opened, the anti-explosion valve 2 will not release from a single point in the center, but from the surface, because the release area is large, it is not easy to cause the electrolytic paper to be ejected, at the same time, the ejection range of the electrolyte will be relatively concentrated, thereby reducing the short circuit and fire problems of the peripheral components of the circuit board.

Claims

1. An explosion-proof aluminum electrolytic capacitor, characterized by: The shell and the core package are sealed by a rubber plug or a sealing cover plate, the bottom of the shell is provided with an explosion-proof valve, and the explosion-proof valve is in the shape of an 8.

2. The explosion-proof aluminum electrolytic capacitor according to claim 1, characterized in that: The explosion-proof valve comprises an S-shaped explosion-proof groove and a straight-line-shaped explosion-proof groove, and the straight-line-shaped explosion-proof groove intersects with the S-shaped explosion-proof groove at the midpoint of the S-shaped explosion-proof groove.

3. The explosion-proof aluminum electrolytic capacitor according to claim 2, characterized in that: The distance between the two end points of the S-shaped explosion-proof groove is one-half to three-fourths of the diameter of the bottom of the shell.

4. The explosion-proof aluminum electrolytic capacitor according to claim 2, characterized in that: The straight-line-shaped explosion-proof groove divides the S-shaped explosion-proof groove into two central-symmetrical arc-shaped explosion-proof grooves, and the depth of the end points of the arc-shaped explosion-proof grooves is less than the depth of the midpoint of the arc-shaped explosion-proof grooves.

5. The explosion-proof aluminum electrolytic capacitor according to claim 4, characterized in that: The depth of the end points of the arc-shaped explosion-proof grooves is half of the depth of the midpoint of the arc-shaped explosion-proof grooves.

6. The explosion-proof aluminum electrolytic capacitor according to claim 4 or 5, characterized in that: The depth of the end points of the arc-shaped explosion-proof grooves gradually increases to the depth of the midpoint of the arc-shaped explosion-proof grooves.

7. The explosion-proof aluminum electrolytic capacitor according to claim 2, characterized in that: The depth of the straight-line-shaped explosion-proof groove is less than or equal to the depth of the end points of the arc-shaped explosion-proof grooves.

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