Cylindrical battery anti-explosion valve structure and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a cylindrical battery explosion-proof valve structure and a battery, which comprise a shell, an explosion-proof valve body is arranged at the bottom of the shell, a plurality of scribed lines are arranged on the explosion-proof valve body, and the depths of the scribed lines are gradually reduced from the center of the explosion-proof valve body to the edge of the explosion-proof valve body. When the explosion-proof valve is used, the plurality of scribed lines with different depths are punched and carved on one side of the explosion-proof valve body towards the inner cavity of the shell, the depths of the scribed lines are gradually reduced from the center of one side of the explosion-proof valve body to the edge of the explosion-proof valve body, and when the pressure reaches the explosion pressure of the explosion-proof valve, the explosion-proof valve firstly explodes from the center and is released along with the pressure; according to the explosion-proof valve, the explosion-proof valve body extends and is torn from the center to the periphery, complete pressure release is facilitated, the possibility of battery explosion is reduced, and when the explosion-proof valve is exploded and torn, the trend of the explosion-proof valve body during breakage is guided and the generation and splashing of explosion fragments are reduced by sequentially arranging the scribed lines with different depths, so that potential threats to the surrounding environment and personnel are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cylindrical battery explosion-proof valve structure and a battery. Background Art

[0002] At present, in order to improve the safety performance of batteries, explosion-proof valves are usually installed on batteries. The explosion-proof valves generally use a thin sheet of explosion-proof membrane fixed on the edge of the explosion-proof hole. When the pressure inside the battery reaches the preset pressure, the pressure squeezes the explosion-proof membrane to separate it from the explosion-proof hole, thereby eliminating the internal pressure of the battery and ensuring battery safety.

[0003] There are many existing technologies for the design and processing of battery explosion-proof valves, such as:

[0004] Chinese patent publication number CN220341438U discloses an explosion-proof valve, a battery casing and a power battery, comprising an annular mounting portion, an explosion-proof valve sheet and a thinning portion, wherein the explosion-proof valve sheet is arranged on the inner side of the annular mounting portion, a runway-shaped notched groove is arranged on the explosion-proof valve sheet along the circumference of the annular mounting portion, and the thinning portion is arranged in the notched groove.

[0005] It can be seen that most of the current cylindrical battery explosion-proof valve structures and batteries include an annular mounting portion and an explosion-proof valve sheet. By setting a notch groove on the edge of the explosion-proof valve sheet and using the notch groove as the thinning portion of the explosion-proof valve sheet, when the pressure reaches the bursting pressure of the explosion-proof valve, the explosion-proof valve extends and tears along the notch groove, making the explosion-proof valve open more smoothly and ensuring the normal use function of the explosion-proof valve. However, if the pressure distribution inside the battery is uneven, the weak area at the edge of the explosion-proof valve may open first, while the central area remains closed, which may lead to incomplete pressure release and may even cause the pressure inside the battery to be concentrated in the unopened area, increasing the risk of explosion.

[0006] In view of this, we propose a cylindrical battery explosion-proof valve structure and a battery. Utility Model Content

[0007] The utility model aims to provide a cylindrical battery explosion-proof valve structure and a battery, the opening direction of which is to extend from the center to both sides, so as to solve the problems raised in the above-mentioned background technology.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A cylindrical battery explosion-proof valve structure comprises a shell, an explosion-proof valve body is arranged at the bottom of the shell, a plurality of engraved lines of different depths are arranged on the side of the explosion-proof valve body facing the inner cavity of the shell, and the depth of the engraved lines gradually becomes shallower from the center of one side of the explosion-proof valve body to the edge of the explosion-proof valve body.

[0010] As a further solution of the utility model: the scale lines include a first scale line arranged at the center of the explosion-proof valve body, second scale lines for guiding the fracture direction of the explosion-proof valve body are symmetrically arranged on both sides of the first scale line, and a third scale line is arranged on the side of the second scale line away from the first scale line.

[0011] As a further solution of the present invention: the depth of the first score line is H1, the depth of the second score line is H2, the depth of the second score line is H3, H1>H2>H3.

[0012] As a further solution of the utility model: the shape of the engraved line is a straight line, a broken line or a curve.

[0013] As a further solution of the present invention: the number of the first engraved lines is n, 1≤n≤6.

[0014] As a further solution of the present invention: the cross-sectional wall thickness of the shell is H0, and the ratio of the depth of the first score line to the cross-sectional wall thickness of the shell is a, 0<a≤1.

[0015] As a further solution of the utility model: the explosion-proof valve body is punched on the bottom of the shell.

[0016] As a further solution of the utility model: the first score line is perpendicular to the second score line and the third score line at the same time, and the second score line is parallel to the third score line.

[0017] A battery comprises the above-mentioned cylindrical battery explosion-proof valve structure.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1. In the cylindrical battery explosion-proof valve structure, a number of lines of different depths are punched on one side of the explosion-proof valve body toward the inner cavity of the shell, and the depth of the lines gradually becomes shallower from the center of one side of the explosion-proof valve body to the edge of the explosion-proof valve body. When the pressure reaches the bursting pressure of the explosion-proof valve, the explosion-proof valve first bursts from the center, and as the pressure is released, it extends and tears from the center to the surrounding areas, which is conducive to complete pressure release and reduces the possibility of battery explosion.

[0020] 2. In the cylindrical battery explosion-proof valve structure, by sequentially setting the engraved lines of different depths, when the explosion-proof valve is exploded and torn, the direction of the explosion-proof valve body when it is broken is guided, and the generation and splashing of explosion fragments are reduced, thereby reducing the potential threat to the surrounding environment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a top view of the battery of this solution;

[0022] Figure 2 This is a cross-sectional view of the bottom of the battery in this solution.

[0023] The meaning of each number in the figure is:

[0024] 100. Shell;

[0025] 200, explosion-proof valve body; 201, first scale line; 202, second scale line; 203, third scale line. DETAILED DESCRIPTION

[0026] 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.

[0027] like Figure 1 and Figure 2 As shown, the present embodiment provides a cylindrical battery explosion-proof valve structure, including a battery shell 100, an explosion-proof valve body 200 is provided at the bottom of the shell 100, and a plurality of engraved lines of different depths are provided on one side of the explosion-proof valve body 200 facing the inner cavity of the shell 100, and the depth of the engraved lines gradually becomes shallower from the center of one side of the explosion-proof valve body 200 to the edge of the explosion-proof valve body 200.

[0028] The improvement of this embodiment lies in that: by punching a plurality of lines of different depths on one side of the explosion-proof valve body 200 toward the inner cavity of the shell 100, the depth of the lines gradually becomes shallower from the center of one side of the explosion-proof valve body 200 to the edge of the explosion-proof valve body 200. When the pressure reaches the bursting pressure of the explosion-proof valve body 200, the explosion-proof valve body 200 first bursts from the center, and as the pressure is released, the tearing extends from the center to the surrounding areas, which is conducive to the complete release of pressure and reduces the possibility of battery explosion. By sequentially setting the lines of different depths, when the explosion-proof valve body 200 bursts and tears, the direction of the explosion-proof valve body 200 when it breaks is guided, and the generation and splashing of explosion fragments are reduced, thereby reducing the potential threat to the surrounding environment and personnel.

[0029] like Figure 1 As shown, considering that the explosion-proof valve body 200 is fixed to the shell 100 and the choice of the engraved line shape, the present embodiment preferably adopts a punching processing method, so that the explosion-proof valve body 200 is punched at the bottom of the shell 100, avoiding the use of traditional welding methods, resulting in changes in the performance of the material of the explosion-proof valve due to welding after the explosion-proof valve is welded to the steel shell assembly, causing a large change in the bursting pressure of the explosion-proof valve, and the consistency of the offline battery cells cannot be guaranteed. At the same time, the shape of the engraved line is a straight line, a broken line or a curve, which can be selected according to the shape of the explosion-proof valve body 200 and the positional relationship of the engraved line in the explosion-proof valve.

[0030] like Figure 2 As shown, considering the influence of the depth of the engraved lines and the number of the engraved lines on the explosion-proof valve body 200, the engraved lines include a first engraved line 201 set at the center of the explosion-proof valve body 200, and second engraved lines 202 for guiding the fracture direction of the explosion-proof valve body 200 are symmetrically arranged on both sides of the first engraved line 201, and a third engraved line 203 is arranged on the side of the second engraved line 202 away from the first engraved line 201. The depth of the first engraved line 201 is H1, the depth of the second engraved line 202 is H2, and the depth of the second engraved line 202 is H3, H1>H2>H3, the cross-sectional wall thickness of the shell 100 is H0, and the depth of the first engraved line 201 is H1. The ratio H1 / H0 of the cross-sectional wall thickness of the body 100 is a, 0<a≤1, so as to limit the depth of the scale line, and the number of the first scale lines 201 is n, 1≤n≤6, so as to limit the number of central scale lines of the explosion-proof valve body 200, so as to avoid the situation where the scale line depth is too deep and the number of scale lines is too large, which reduces the structural performance of the explosion-proof valve body 200. At the same time, in this embodiment, the preferred scheme is that the first scale line 201 is perpendicular to the second scale line 202 and the third scale line 203 at the same time, and the second scale line 202 and the third scale line 203 are parallel, so as to better control the overall direction of the explosion-proof valve body 200 when it is exploded.

[0031] In summary, the working principle of this scheme is as follows:

[0032] The explosion-proof valve body 200 is punched out at the bottom of the shell 100 by using a punching device, and then the side of the explosion-proof valve body 200 close to the inner cavity of the shell 100 is processed, and the cross-sectional wall thickness of the shell 100 is measured to be H0. According to the cross-sectional wall thickness H0 of the shell 100, the first score line 201, the second score line 202 and the third score line 203 are punched out in sequence from the center to the edge of the explosion-proof valve body 200. The depth of the first score line 201 is H1, the depth of the second score line 202 is H2, the depth of the second score line 202 is H3, and the relationship between the cross-sectional wall thickness H0 of the shell 100 is H1>H2>H3, H1 / H0 is a, 0<a≤1, and the installation of the explosion-proof valve body 200 is completed after the processing is completed. When the pressure in the battery reaches the bursting pressure of the explosion-proof valve, the explosion-proof valve body 200 first bursts from the center, and as the pressure is released, it extends and tears from the center to the surrounding areas.

[0033] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0034] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A cylindrical battery explosion-proof valve structure, comprising a housing (100), characterized in that: An explosion-proof valve body (200) is provided at the bottom of the shell (100), and a plurality of engraved lines of different depths are provided on one side of the explosion-proof valve body (200) facing the inner cavity of the shell (100), wherein the depth of the engraved lines gradually decreases from the center of one side of the explosion-proof valve body (200) to the edge of the explosion-proof valve body (200).

2. The cylindrical battery explosion-proof valve structure according to claim 1, characterized in that: The engraved lines include a first engraved line (201) arranged at the center of the explosion-proof valve body (200), second engraved lines (202) for guiding the fracture direction of the explosion-proof valve body (200) are symmetrically arranged on both sides of the first engraved line (201), and a third engraved line (203) is arranged on the side of the second engraved line (202) away from the first engraved line (201).

3. The cylindrical battery explosion-proof valve structure according to claim 2, characterized in that: The depth of the first scribed line (201) is H1, the depth of the second scribed line (202) is H2, and the depth of the second scribed line (202) is H3, where H1>H2>H3.

4. The cylindrical battery explosion-proof valve structure according to claim 3, characterized in that: The shape of the engraved line is a straight line, a broken line or a curved line.

5. The cylindrical battery explosion-proof valve structure according to claim 4, characterized in that: The number of the first score lines (201) is n, 1≤n≤6.

6. The cylindrical battery explosion-proof valve structure according to claim 2, characterized in that: The cross-sectional wall thickness of the shell (100) is H0, and the ratio of the depth of the first score line (201) to the cross-sectional wall thickness of the shell (100) is a, and 0<a≤1.

7. The cylindrical battery explosion-proof valve structure according to claim 1, characterized in that: The explosion-proof valve body (200) is punched on the bottom of the shell (100).

8. The cylindrical battery explosion-proof valve structure according to claim 2, characterized in that: The first score line (201) is perpendicular to both the second score line (202) and the third score line (203), and the second score line (202) and the third score line (203) are parallel.

9. A battery, characterized in that: The battery comprises the cylindrical battery explosion-proof valve structure according to any one of claims 1 to 8.

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