Overvoltage protection structure of overturning sheet

Abstract

The utility model discloses an overvoltage protection structure of a turnover piece, which belongs to the technical field of battery safety, and comprises a mounting edge and a turnover edge fixed with the mounting edge, a plurality of grooves are arranged in the turnover edge, a hollow cylinder is integrally fixed in the middle of the turnover edge, and the turnover edge is provided with a plurality of grooves. A first high-elasticity thin film and a second high-elasticity thin film are distributed and fixed at the bottom and the top of the column body, the first high-elasticity thin film and the second high-elasticity thin film are consistent in protruding direction, and an expansion insulation thin film is fixed at the end, away from the overturning edge, of the column body; the over-voltage protection structure of the turnover piece can effectively prevent the turnover piece from being burnt through or fused, meanwhile, the contact area between the internal main body of the turnover piece and the battery conducting strip can be increased, the current is quickly blocked, and the safety is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery safety, and in particular relates to an overvoltage protection structure of a flip plate. Background Art

[0002] At present, with the increasing miniaturization, lightness and portability of electronic products, such as cameras, notebooks and mobile phones, the driving power of these electronic products is also developing in the direction of high capacity, high safety and lightness. Batteries are widely used in electronic products due to their excellent characteristics such as high capacity.

[0003] As the energy storage element of the battery, the battery cell will produce abnormal gas inside the shell when the battery is in use due to factors such as the charger and the internal chemical reaction of the battery, resulting in excessive internal pressure of the battery shell. If the internal pressure of the shell continues to increase, a battery explosion accident will occur, which may damage electronic products at the least and injure users at the worst.

[0004] In the prior art, when the internal pressure of a battery is too high, in order to prevent the battery from exploding, the pressure in the battery shell needs to be released. In order to prevent the battery from directly exploding, a flip plate is provided in the top cover of the battery top cover. When the internal pressure of the battery exceeds a certain value, the flip plate will flip upward, causing a short circuit between the positive and negative electrodes of the battery, and the battery stops working, so that the internal pressure of the battery will not increase.

[0005] However, when the annular column of the flip plate flips and causes a short circuit in the battery, the huge current generated instantly can easily burn through or fuse the flip plate, causing the flip plate to fail and unable to work normally. The current inside the battery may also continue to increase, causing a dangerous accident. Utility Model Content

[0006] The utility model aims to provide an overvoltage protection structure of a flip plate, which can effectively prevent the flip plate from being burned through or melted, and at the same time increase the contact area between the internal body of the flip plate and the battery conductive sheet, quickly block the current, and have high safety.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an overvoltage protection structure of a flip plate, comprising a mounting edge and a flip edge fixed to the mounting edge, a plurality of grooves being arranged inside the flip edge, a column being integrally fixed in the middle of the flip edge, the interior of the column being hollow, a first high elastic film and a second high elastic film being distributed and fixed at the bottom and top of the column, the protrusion directions of the first high elastic film and the second high elastic film being consistent, and an extended insulating film being fixed to the column away from the flip edge end.

[0008] Furthermore, a plurality of annular grooves are provided at the bottom of the flip edge, and carbon fiber layers are bonded inside the annular grooves.

[0009] Furthermore, a plurality of fine holes are provided on the side surface of the cylinder, and the fine holes are arranged at equal distances along the circumference direction of the cylinder.

[0010] Furthermore, a clamping rod is fixed at the bottom of the installation edge, and a plurality of clamping rods are arranged along the circumferential direction of the installation edge. A wedge-shaped protrusion is fixed to the end of the clamping rod away from the installation edge.

[0011] Furthermore, the protrusion direction of the first high elastic film and the second high elastic film is away from the end of the column.

[0012] The beneficial effects of the utility model are:

[0013] A plurality of annular grooves are provided at the bottom of the flip edge to increase the contact area between the bottom of the flip edge and the pressure, thereby first releasing energy. At the same time, a carbon fiber layer is provided inside the annular groove to further release energy through its own extension by utilizing the excellent high strength and other physical properties of the carbon fiber itself, thereby preventing the internal pressure of the battery from being too large to break through the flip edge, thereby improving the stability of the flip edge. The side of the flip edge is wavy with a plurality of grooves, thereby further increasing the overall pressure-bearing area of ​​the flip edge, thereby further improving the stability of the flip edge. 3. When the top of the column contacts the conductive sheet of the battery, the extended insulating film and the second high-elastic film can both contact the conductive sheet, thereby increasing the contact area with the conductive sheet, thereby improving the current blocking effect, thereby preventing the current from melting the flip edge, and further improving the stability of the flip edge. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the overvoltage protection structure of the flip plate provided by the utility model;

[0015] Figure 2 The utility model provides Figure 1 Schematic cross-section of .

[0016] In the figure: 1. mounting edge; 2. flip edge; 3. groove; 4. column; 5. first high elastic film; 6. second high elastic film; 7. extended insulating film; 8. annular groove; 9. carbon fiber layer; 10. pores; 11. clamping rod; 12. wedge-shaped protrusion. DETAILED DESCRIPTION

[0017] In order to further understand the content, features and effects of the utility model, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0018] Please also refer to Figure 1 to Figure 2 The overvoltage protection structure of the flip sheet of the embodiment of the utility model will be described in detail below with reference to the accompanying drawings.

[0019] The overvoltage protection structure of the flip sheet provided by the utility model is installed on the top cover sheet of the battery. When the pressure inside the battery is too large, the flip edge flips to short-circuit the positive electrode and the negative electrode. At the same time, in order to prevent the flip edge from being burned through or melted due to excessive current flowing through the flip edge, the stable working performance of the flip edge is guaranteed.

[0020] like Figure 1 As shown, the overvoltage protection structure of the flip sheet includes a mounting edge 1, a flip edge 2 fixed to the mounting edge 1, a plurality of grooves 3 are arranged inside the flip edge 2, a column 4 is integrally fixed to the middle of the flip edge 2, the interior of the column 4 is hollow, a first high elastic film 5 and a second high elastic film 6 are distributed and fixed at the bottom and top of the column 4, the first high elastic film 5 and the second high elastic film 6 have the same protruding direction, and an extended insulating film 7 is fixed to the end of the column 4 away from the flip edge 2.

[0021] The first high elastic film 5 and the second high elastic film 6 bulge in a direction away from the end of the column 4. Under the influence of the increased internal pressure of the battery, the flip edge 2 flips upward. At this time, the pressure provided by the battery completely contacts the bottom of the flip edge 2, and then the first high elastic film 5 bulges toward the inside of the column 4, squeezing the internal space of the column 4.

[0022] As an implementation method in this embodiment, a plurality of annular grooves 8 are provided at the bottom of the flip edge 2, and a carbon fiber layer 9 is bonded inside the annular groove 8. Since the bottom of the flip edge 2 directly receives pressure, the annular grooves 8 are provided, and a plurality of annular grooves 8 are provided at the bottom of the flip edge 2 to increase the contact area between the bottom of the flip edge 2 and the pressure, and first release energy. At the same time, a carbon fiber layer 9 is provided inside the annular groove 8, and the excellent high strength and other physical properties of the carbon fiber itself are utilized. Through its own extension, energy is further released, thereby preventing the internal pressure of the battery from being too large to break through the flip edge 2, and improving the stability of the flip edge 2.

[0023] At the same time, the side surface of the flip edge 2 is wavy with a plurality of grooves 3, which further increases the overall pressure-bearing area of ​​the flip edge 2 and further improves the stability of the flip edge 2.

[0024] In addition, a plurality of fine holes 10 are provided on the side of the column 4 , and the fine holes 10 are arranged equidistantly along the circumferential direction of the column 4 .

[0025] After the first high elastic film 5 protrudes toward the inside of the column 4, the internal space of the column 4 is squeezed, and air is taken in along the pores 10, so that the extended insulating film 7 protrudes outward, and at the same time the second high elastic film 6 protrudes outward, and then when the top of the column 4 contacts the conductive sheet of the battery, both the extended insulating film 7 and the second high elastic film 6 can be in contact with the conductive sheet, increasing the contact area with the conductive sheet, so that the current blocking effect is improved, thereby avoiding the current from melting the flip edge 2, and further improving the stability of the flip edge 2.

[0026] Among them, in this embodiment, the first high elastic film 5, the second high elastic film 6 and the extended insulating film 7 are all made of TPU film, which has good elasticity and non-conductive properties and meets the requirements for achieving the above technical effects.

[0027] As an implementation method of this embodiment, a clamping rod 11 is fixed at the bottom of the mounting edge 1, and several clamping rods 11 are provided along the circumferential direction of the mounting edge 1. A wedge-shaped protrusion 12 is fixed at the end of the clamping rod 11 away from the mounting edge 1. The mounting edge 1 can be directly clamped on the inside of the battery outer shell, thereby facilitating the installation of the overall flip edge 2.

[0028] Although 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. An overvoltage protection structure of a flip plate, characterized in that: The overvoltage protection structure of the flip sheet comprises a mounting edge (1), a flip edge (2) fixed to the mounting edge (1), a plurality of grooves (3) being arranged inside the flip edge (2), a column (4) being integrally fixed in the middle of the flip edge (2), the column (4) being hollow inside, a first high elastic film (5) and a second high elastic film (6) being distributed and fixed at the bottom and top of the column (4), the first high elastic film (5) and the second high elastic film (6) protruding in the same direction, and an extended insulating film (7) being fixed at the end of the column (4) away from the flip edge (2).

2. The overpressure protection structure of the flip sheet according to claim 1, characterized in that: A plurality of annular grooves (8) are provided at the bottom of the turning edge (2), and a carbon fiber layer (9) is bonded inside the annular groove (8).

3. The overpressure protection structure of the flip sheet according to claim 1, characterized in that: A plurality of fine holes (10) are provided on the side of the column (4), and the fine holes (10) are arranged at equal distances along the circumferential direction of the column (4).

4. The overpressure protection structure of the flip sheet according to claim 1, characterized in that: A clamping rod (11) is fixed at the bottom of the installation edge (1), and a plurality of clamping rods (11) are arranged along the circumferential direction of the installation edge (1). A wedge-shaped protrusion (12) is fixed at the end of the clamping rod (11) away from the installation edge (1).

5. The overpressure protection structure of the flip sheet according to claim 1, characterized in that: The first high-elastic film (5) and the second high-elastic film (6) protrude in a direction away from the end of the column (4).

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