Explosion-proof cover plate structure and button cell

Abstract

The utility model provides an explosion-proof cover plate structure and a button cell. The explosion-proof cover plate structure comprises a cover plate, a pole, insulating glue layers and an explosion-proof membrane, the thickness of the explosion-proof membrane is 0.05-0.12 mm, the number of the insulating glue layers is two, the two insulating glue layers are respectively adhered to two opposite side surfaces of the explosion-proof membrane, each insulating glue layer is provided with a pressure relief hole, and the pressure relief holes are communicated with the explosion-proof membrane. The pressure relief holes of the two insulating adhesive layers are symmetrically arranged relative to the explosion-proof membrane; wherein one side, deviating from the explosion-proof membrane, of one insulating adhesive layer is adhered to the pole, and the pole is provided with an air inlet hole which is communicated with the pressure relief hole of the adjacent insulating adhesive layer; one side, deviating from the explosion-proof membrane, of the other insulating adhesive layer is adhered to a covering plate, and an air outlet hole is formed in the covering plate and is communicated with the pressure relief hole of the adjacent insulating adhesive layer. Because the insulation glue layer does not need to be hot-melted before pressure relief, the time for hot melting of the insulation glue layer is saved, the timeliness of pressure relief of the button cell is improved, and the risk of explosion of the button cell is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of button batteries, and in particular to an explosion-proof cover plate structure and a button battery. Background Art

[0002] Button batteries, shaped like buttons, are widely used in electronic products. When button batteries are subjected to extreme conditions such as overcharge, short circuit, high temperature environment, etc., the internal pressure of the button battery will increase to protect it.

[0003] To avoid the explosion of button batteries, related technologies, such as CN215418489U - a steel shell button battery with a double explosion-proof structure, have notches designed on the surface of the button battery, and the notches are etched on the shell of the button battery by a laser machine, but the etching consistency is poor and the explosion-proof consistency of the notches is poor.

[0004] In order to improve the explosion-proof consistency, in the related art, for example, CN219144314U-cover plate assembly and button battery, shell and cover plate assembly, the cover plate assembly includes a cover plate, a pole and an insulating rubber layer, the cover plate is connected to the pole through the insulating rubber layer, a through hole is provided on the cover plate, the surface of the insulating rubber layer facing the cover plate is the rubber layer connection surface connected to the cover plate, and a first explosion-proof hole is provided on one of the cover plate and the pole, the first explosion-proof hole has an orthographic projection on the rubber layer connection surface, and the orthographic projection of the first explosion-proof hole on the rubber layer connection surface is located on the insulating rubber layer as a whole, and the hole end face of the first explosion-proof hole is in contact with the insulating rubber layer. In this way, when the internal pressure and temperature of the button battery increase, the high-temperature and high-pressure gas inside the button battery can contact the insulating rubber layer through the first explosion-proof hole, and make part of the insulating rubber layer melt at high temperature. Under the action of high pressure, the gas inside the button battery can impact the rubber layer through the first explosion-proof hole, and pass through the rubber layer to communicate with the external environment, so as to achieve the purpose of pressure relief and explosion prevention.

[0005] However, since the high-pressure gas can only break through the adhesive layer and complete the pressure release after the insulating adhesive layer is hot-melted, the pressure release is slow, and the risk of button battery explosion is still high. Utility Model Content

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide an explosion-proof cover structure and a button battery that can release pressure more timely and reduce the risk of explosion.

[0007] The purpose of this disclosure is achieved through the following technical solutions:

[0008] An explosion-proof cover plate structure, comprising a cover plate, a pole and an insulating rubber layer, the explosion-proof cover plate structure also comprises an explosion-proof membrane, the thickness of the explosion-proof membrane is 0.05 mm to 0.12 mm, the number of the insulating rubber layers is two, the two insulating rubber layers are respectively bonded to two opposite sides of the explosion-proof membrane, each insulating rubber layer is provided with a pressure relief hole, and the pressure relief holes of the two insulating rubber layers are symmetrically arranged relative to the explosion-proof membrane;

[0009] One side of the insulating rubber layer facing away from the explosion-proof membrane is bonded to the pole, the pole is provided with an air inlet hole, and the air inlet hole is connected to the pressure relief hole of the adjacent insulating rubber layer;

[0010] The other insulating rubber layer is bonded to the cover plate at one side away from the explosion-proof membrane. The cover plate is provided with an air outlet hole which is communicated with the pressure relief hole of the adjacent insulating rubber layer.

[0011] In one embodiment, the explosion-proof film is a PP adhesive layer.

[0012] In one embodiment, the explosion-proof membrane is a nylon layer.

[0013] In one embodiment, the axis of the pressure relief hole, the axis of the air inlet hole and the axis of the air outlet hole coincide with each other.

[0014] In one embodiment, the diameter of the pressure relief hole, the diameter of the air inlet hole and the diameter of the air outlet hole are equal.

[0015] In one embodiment, the diameter of the pressure relief hole is 0.5 mm to 2 mm.

[0016] In one embodiment, the distance between the inner wall of the air inlet and the outer edge of the pole is greater than 1 mm.

[0017] In one of the embodiments, the periphery of each insulating adhesive layer coincides with the periphery of the explosion-proof membrane.

[0018] In one embodiment, the insulating rubber layer and the explosion-proof membrane are both circular.

[0019] A button battery comprises the explosion-proof cover structure described in any one of the above embodiments.

[0020] Compared with the prior art, the present invention has at least the following advantages:

[0021] When the air pressure in the button battery increases to the preset pressure, the gas in the button battery directly breaks through the explosion-proof membrane after passing through the air inlet hole, so that the gas inside the button battery leaks out to the outside through the air inlet hole, the broken part of the explosion-proof membrane and the air outlet hole in sequence, avoiding the problem of button battery exploding due to excessive internal pressure and improving the safety performance of button battery; since there is no need to wait for the insulating glue layer to melt before pressure relief, the time for hot-melting the insulating glue layer is saved, which improves the timeliness of button battery pressure relief and reduces the risk of button battery explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic structural diagram of a button battery according to an embodiment;

[0024] Figure 2 for Figure 1 An enlarged schematic diagram of the button battery at position A;

[0025] Figure 3 for Figure 1 A schematic structural diagram of the explosion-proof cover structure of the button battery.

[0026] Figure numerals: 10, explosion-proof cover plate structure; 100, cover plate; 101, air outlet; 200, pole; 201, air inlet; 300, insulating rubber layer; 301, pressure relief hole; 400, explosion-proof membrane. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0031] like Figures 1 to 3 As shown, an explosion-proof cover plate structure 10 of an embodiment includes a cover plate 100, a pole 200 and an insulating rubber layer 300. The explosion-proof cover plate structure 10 also includes an explosion-proof membrane 400, and the thickness of the explosion-proof membrane 400 is 0.05 mm to 0.12 mm. There are two insulating rubber layers 300, and the two insulating rubber layers 300 are respectively bonded to the two opposite sides of the explosion-proof membrane 400, that is, the explosion-proof membrane 400 is clamped between the two insulating rubber layers 300, that is, the two insulating rubber layers 300 are compounded together through the explosion-proof membrane 400. Each insulating rubber layer 300 is provided with a pressure relief hole 301, and the pressure relief holes 301 of the two insulating rubber layers 300 are symmetrically arranged relative to the explosion-proof membrane 400. One side of the insulating rubber layer 300 facing away from the explosion-proof membrane 400 is bonded to the pole 200, that is, one side of the insulating rubber layer 300 facing away from the explosion-proof membrane 400 is composited on the pole 200, and the pole 200 is provided with an air inlet 201, and the air inlet 201 is connected to the pressure relief hole 301 of the adjacent insulating rubber layer 300. The other side of the insulating rubber layer 300 facing away from the explosion-proof membrane 400 is bonded to the cover plate 100, that is, the other side of the insulating rubber layer 300 facing away from the explosion-proof membrane 400 is composited on the cover plate 100, and the cover plate 100 is provided with an air outlet 101, and the air outlet 101 is connected to the pressure relief hole 301 of the adjacent insulating rubber layer 300.

[0032] like Figure 1 and Figure 2 As shown, in this embodiment, when the air pressure in the button battery increases to the preset air pressure, the gas in the button battery directly breaks through the explosion-proof membrane 400 after passing through the air inlet 201, so that the gas inside the button battery is discharged to the outside through the air inlet 201, the broken part of the explosion-proof membrane 400 and the air outlet 101 in sequence. It should be noted that the preset air pressure value is 0.5 MPa to 1.2 MPa, which can be set by adjusting the thickness of the explosion-proof membrane 400.

[0033] It should be noted that when the thickness of the explosion-proof membrane 400 is less than 0.05 mm, the internal pressure generated by the normal operation of the button battery can break through the explosion-proof membrane 400, causing the button battery to fail to work normally; when the thickness of the explosion-proof membrane 400 is greater than 0.12 mm, due to the thicker thickness of the explosion-proof membrane 400, when the internal pressure of the button battery is too large, the internal pressure of the button battery still cannot break through the explosion-proof membrane 400, causing the explosion-proof membrane 400 to fail and fail to achieve an explosion-proof effect. Therefore, the thickness of the explosion-proof membrane 400 disclosed in the present invention is 0.05 mm to 0.12 mm.

[0034] In the above-mentioned explosion-proof cover structure 10, when the air pressure in the button battery increases to a preset pressure, the gas in the button battery directly breaks through the explosion-proof membrane 400 after passing through the air inlet 201, so that the gas inside the button battery is leaked to the outside through the air inlet 201, the broken part of the explosion-proof membrane 400 and the air outlet 101 in sequence, thereby avoiding the problem of the button battery exploding due to excessive internal pressure and improving the safety performance of the button battery; since there is no need to wait for the insulating adhesive layer 300 to be hot-melted before pressure relief, the time for hot-melting the insulating adhesive layer 300 is saved, thereby improving the timeliness of the pressure relief of the button battery and reducing the risk of the button battery exploding.

[0035] In one embodiment, the thickness of the explosion-proof film 400 is 0.05 mm, 0.08 mm or 0.12 mm. Of course, in other embodiments, the thickness of the explosion-proof film 400 can also be other values ​​within 0.05-0.12 mm.

[0036] In one embodiment, the explosion-proof film 400 is a PP adhesive layer, so that the gas of the button battery can break through the explosion-proof film 400, and at the same time, the explosion-proof film 400 can play the role of water-proof and gas-proof.

[0037] It is understood that in other embodiments, the explosion-proof film 400 is not limited to a PP layer. For example, in one embodiment, the explosion-proof film 400 is a nylon layer, so that the gas of the button battery can break through the explosion-proof film 400, and the explosion-proof film 400 can play a role in water and gas isolation.

[0038] like Figure 2 As shown, in one of the embodiments, the axis of the pressure relief hole 301, the axis of the air inlet 201 and the axis of the air outlet 101 coincide with each other, so that the impact point of the explosion-proof membrane 400 corresponds to the air inlet 201 and the air outlet 101 respectively, so that the gas can more easily break through the explosion-proof membrane 400, which helps to improve the explosion-proof timeliness of the button battery.

[0039] like Figure 2 As shown, in one embodiment, the diameter of the pressure relief hole 301, the diameter of the air inlet hole 201 and the diameter of the air outlet hole 101 are equal.

[0040] In one embodiment, the diameter of the pressure relief hole 301 is 0.5 mm to 2 mm. Further, the diameter of the pressure relief hole 301 is 0.5 mm, 0.8 mm or 2 mm. Of course, in other embodiments, the diameter of the pressure relief hole 301 may also be other values ​​within 0.5-2 mm. It should be noted that in other embodiments, the diameter of the pressure relief hole 301, the diameter of the air inlet 201 and the diameter of the air outlet 101 may also be unequal.

[0041] like Figure 2 As shown, in one embodiment, the distance between the inner wall of the air inlet 201 and the outer edge of the pole 200 is greater than 1 mm. It can be understood that the pressure relief hole 301 is a virtual body, and the structure around the pressure relief hole 301 is more likely to collapse when there is no supporting force. In this embodiment, the distance between the inner wall of the air inlet 201 and the outer edge of the pole 200 is greater than 1 mm, so that the structure of the insulating rubber layer 300 around the pressure relief hole 301 can be supported by the pole 200, thereby improving the structural stability of the explosion-proof cover structure 10.

[0042] like Figure 2 As shown, in one embodiment, the periphery of each insulating adhesive layer 300 coincides with the periphery of the explosion-proof membrane 400 .

[0043] like Figure 2 As shown, in one embodiment, the insulating adhesive layer 300 and the explosion-proof membrane 400 are both circular.

[0044] like Figure 1 As shown, the present disclosure further provides a button battery, comprising the explosion-proof cover structure 10 of any of the above embodiments.

[0045] Compared with the prior art, the present invention has at least the following advantages:

[0046] 1. When the air pressure in the button battery increases to a preset pressure, the gas in the button battery directly breaks through the explosion-proof membrane 400 after passing through the air inlet 201, so that the gas inside the button battery is discharged to the outside through the air inlet 201, the broken part of the explosion-proof membrane 400 and the air outlet 101 in sequence, thereby avoiding the problem of the button battery exploding due to excessive internal pressure and improving the safety performance of the button battery;

[0047] 2. Since there is no need to wait for the insulating adhesive layer 300 to be hot-melted before pressure relief, the time for hot-melting the insulating adhesive layer 300 is saved, the timeliness of the pressure relief of the button battery is improved, and the risk of explosion of the button battery is reduced.

[0048] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. An explosion-proof cover plate structure, comprising a cover plate, a pole and an insulating rubber layer, characterized in that: The explosion-proof cover structure also includes an explosion-proof membrane, the thickness of the explosion-proof membrane is 0.05 mm to 0.12 mm, the number of the insulating adhesive layers is two, the two insulating adhesive layers are respectively bonded to the two opposite sides of the explosion-proof membrane, each insulating adhesive layer is provided with a pressure relief hole, and the pressure relief holes of the two insulating adhesive layers are symmetrically arranged relative to the explosion-proof membrane; One side of the insulating rubber layer facing away from the explosion-proof membrane is bonded to the pole, the pole is provided with an air inlet hole, and the air inlet hole is connected to the pressure relief hole of the adjacent insulating rubber layer; The other insulating adhesive layer is bonded to the cover plate at one side away from the explosion-proof membrane. The cover plate is provided with an air outlet hole which is communicated with the pressure relief hole of the adjacent insulating adhesive layer.

2. The explosion-proof cover structure according to claim 1, characterized in that: The explosion-proof film is a PP adhesive layer.

3. The explosion-proof cover structure according to claim 1, characterized in that: The explosion-proof membrane is a nylon layer.

4. The explosion-proof cover structure according to claim 1, characterized in that: The axis of the pressure relief hole, the axis of the air inlet hole and the axis of the air outlet hole coincide with each other.

5. The explosion-proof cover structure according to claim 4, characterized in that: The diameters of the pressure relief hole, the air inlet hole and the air outlet hole are equal.

6. The explosion-proof cover structure according to claim 5, characterized in that: The diameter of the pressure relief hole is 0.5 mm to 2 mm.

7. The explosion-proof cover structure according to claim 1, characterized in that: The distance between the inner wall of the air inlet and the outer edge of the pole is greater than 1 mm.

8. The explosion-proof cover structure according to claim 1, characterized in that: The periphery of each insulating rubber layer coincides with the periphery of the explosion-proof membrane.

9. The explosion-proof cover structure according to claim 1, characterized in that: The insulating rubber layer and the explosion-proof membrane are both circular.

10. A button battery, characterized in that: The invention comprises the explosion-proof cover structure according to any one of claims 1 to 9.

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