Button battery

Abstract

The present invention relates to a button battery, comprising a cap, a bottom shell and a battery cell, wherein the cap is arranged on the bottom shell to form a receiving cavity, the battery cell is arranged in the receiving cavity, the bottom shell comprises a bottom plate and a first surrounding wall arranged on the bottom plate, the cap comprises a top plate and a second surrounding wall arranged on the top plate, there is an overlapping area between the first surrounding wall and the second surrounding wall, at least one first notch is arranged on the first surrounding wall, at least one second notch is arranged on the second surrounding wall, the first notch and the second notch are both located on the overlapping area, the first notch and the second notch are arranged at intervals, and when the air pressure in the receiving cavity increases, the air pressure can drive the cap and the bottom shell to move in opposite directions so that the first notch and the second notch are connected. The button battery utilizes the effect of air pressure to cause the cap and the bottom shell to move in directions away from each other so that the first notch and the second notch are connected, so that the receiving cavity can be depressurized through the first notch and the second notch, thereby realizing the automatic depressurization and explosion-proof function of the button battery.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a button battery. Background Art

[0002] Button batteries, also known as button batteries and bean batteries, refer to batteries that are shaped like a small button. Button batteries are small in size, so they are widely used in various microelectronic products.

[0003] At present, it is difficult to set an explosion-proof structure inside the button battery due to its small size. When a short circuit or other conditions occur inside the button battery, high voltage will appear inside the battery. If the pressure cannot be released in time, there is a risk of battery explosion. The battery explosion will not only damage the electronic products, but also threaten the personal safety of the user. In the prior art, the button battery has an explosion-proof hole on the cap. When the internal air pressure of the button battery increases, the explosion-proof hole is pushed out of the bottom shell to release the pressure through the explosion-proof hole. However, the pressure release efficiency through only one explosion-proof hole is low and cannot meet the explosion-proof requirements of the button battery. Summary of the invention

[0004] The purpose of the embodiment of the present invention is to provide a button-type battery with a simple structure and good pressure relief effect.

[0005] To achieve this purpose, the embodiment of the present invention adopts the following technical solutions:

[0006] A button battery is provided, comprising a bottom shell, a cap and a battery cell, wherein the cap is arranged on the bottom shell to form a accommodating cavity, and the battery cell is arranged in the accommodating cavity, the bottom shell comprises a bottom plate and a first surrounding wall arranged around the bottom plate, the cap comprises a top plate and a second surrounding wall arranged around the top plate, an overlapping area is provided between the first surrounding wall and the second surrounding wall, at least one first notch is provided on the first surrounding wall, at least one second notch is provided on the second surrounding wall, the first notch and the second notch are both located on the overlapping area, and the first notch and the second notch are spaced apart, and when the air pressure in the accommodating cavity increases, the air pressure can drive the cap and the bottom shell to move in opposite directions so that the first notch and the second notch are connected.

[0007] As a preferred solution for a button-type battery, a second arc-shaped portion is provided on the second surrounding wall, the second arc-shaped portion protrudes toward and away from the center of the second surrounding wall, and at least part of the second notch is located on the second arc-shaped portion, the first surrounding wall is perpendicular to the bottom plate, so that an air passage is formed between the second arc-shaped portion and the outer wall of the first surrounding wall, and when the accommodating chamber is depressurized, the first notch and the second notch can be connected through the air passage.

[0008] As a preferred solution for a button-type battery, the first surrounding wall includes a first arc-shaped portion protruding outward, and the second surrounding wall includes a second arc-shaped portion matching the first arc-shaped portion.

[0009] As a preferred solution of a button-type battery, the first arc-shaped portion is formed by stamping or rolling the first surrounding wall, and the second arc-shaped portion is formed by stamping or rolling the second surrounding wall.

[0010] As a preferred solution of a button-type battery, when the accommodating cavity is depressurized, the first notch and the second notch overlap.

[0011] As a preferred solution of the button battery, four first notches are provided, and two adjacent first notches are distributed on the first surrounding wall at an angle of 90 degrees between them; and / or,

[0012] There are four second notches, and two adjacent second notches are distributed on the second surrounding wall at an angle of 90 degrees between them.

[0013] As a preferred solution of a button battery, the first notch is a V-shaped notch or a U-shaped notch; and / or,

[0014] The second notch is a V-shaped notch or a U-shaped notch.

[0015] As a preferred solution for a button cell, the bottom shell and the cover cap are both made of metal material.

[0016] As a preferred solution of the button battery, a sealing member is provided between the first surrounding wall and the second surrounding wall, and the sealing member completely covers the first notch; or,

[0017] The sealing member is provided with a third notch at a position directly opposite to the first notch.

[0018] As a preferred solution for a button cell, the sealing member covers the end of the first surrounding wall.

[0019] The beneficial effects of the embodiments of the present invention are as follows: the button-type battery utilizes the effect of air pressure, which can drive the cap and the bottom shell to move in opposite directions so that the first notch and the second notch are connected, so that the accommodating cavity can release pressure through the first notch and the second notch, avoiding explosion caused by continuous increase of internal pressure, thereby realizing the automatic pressure relief and explosion-proof function of the button-type battery, and the structure is simple and the pressure relief effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0021] Figure 1 FIG. 4 is a schematic diagram of the interior of a button battery according to an embodiment of the present invention.

[0022] Figure 2 It is a structural schematic diagram of a button battery in a normal state according to an embodiment of the present invention.

[0023] Figure 3 It is a structural schematic diagram of a button-type battery in a pressure relief state according to an embodiment of the present invention.

[0024] Figure 4 Schematic diagram of the structure of the bottom shell of an embodiment of the present invention.

[0025] Figure 5 Schematic diagram of the structure of the cap according to an embodiment of the present invention.

[0026] In the figure:

[0027] 1. Bottom shell; 11. Bottom plate; 12. First surrounding wall; 121. First notch; 122. First arc-shaped portion; 123. First straight arm; 124. Second straight arm; 2. Cover cap; 21. Top plate; 22. Second surrounding wall; 221. Second notch; 222. Second arc-shaped portion; 223. Third straight arm; 3. Battery cell; 4. Accommodating cavity; 5. Sealing member; 51. Sealing body; 52. First extension portion; 53. Second extension portion. DETAILED DESCRIPTION

[0028] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] like Figure 1 and Figure 2 As shown, the button battery of the embodiment of the present invention includes a bottom shell 1, a cap 2 and a battery cell 3, the cap 2 is arranged on the bottom shell 1 to form a accommodating cavity 4, the battery cell 3 is arranged in the accommodating cavity 4, the bottom shell 1 includes a bottom plate 11 and a first surrounding wall 12 arranged on the bottom plate 11, the cap 2 includes a top plate 21 and a second surrounding wall 22 arranged on the top plate 21, there is an overlapping area between the first surrounding wall 12 and the second surrounding wall 22, at least one first notch 121 is arranged on the first surrounding wall 12, at least one second notch 221 is opened on the second surrounding wall 22, the second notch 221 and the first notch 121 are both located on the overlapping area, when the air pressure in the accommodating cavity 4 increases, the air pressure can drive the cap 2 and the bottom shell 1 to move in opposite directions, so that the accommodating cavity 4 can be depressurized through the first notch 121 and the second notch 221. The button battery utilizes the effect of air pressure to move the cap 2 and the bottom shell 1 away from each other, so that the first notch 121 and the second notch 221 are connected, and the pressure of the accommodating chamber 4 is relieved through the first notch 121 and the second notch 221, thereby realizing the automatic pressure relief and explosion-proof function of the button battery, and the structure is simple and the pressure relief effect is good. It can be understood that when the button battery is in a normal state, the cap 2 is fastened on the bottom shell 1 to form a sealed accommodating chamber 4 for accommodating the battery cell 3, the first notch 121 will be blocked by the second surrounding wall 22, and the second notch 221 will be blocked by the first surrounding wall 12, so that the accommodating chamber 4 is in a sealed state and cannot be relieved. When the air pressure inside the accommodating chamber 4 increases, the air pressure causes displacement between the cap 2 and the bottom shell 1, and the cap 2 and the bottom shell 1 move away from each other, so that the first notch 121 and the second notch 221 gradually withdraw from the overlapping area, so that the first notch 121 and the second notch 221 are connected, and the accommodating chamber 4 releases pressure through the first notch 121 and the second notch 221 to avoid explosion caused by continuous increase of internal pressure, so that the button battery has better explosion-proof and pressure relief function.

[0032] In this embodiment, the first notch 121 means a notch that is opened through the first surrounding wall 12 along its thickness direction, and the notch is connected to the edge of the first surrounding wall 12; the second notch 221 means a notch that is opened through the second surrounding wall 22 along its thickness direction, and the notch is connected to the edge of the second surrounding wall 22.

[0033] The overlapping area means that when assembling the button battery, a part of the second surrounding wall 22 of the cap 2 is arranged outside the first surrounding wall 12 of the bottom shell 1, and the part where the first surrounding wall 12 and the second surrounding wall 22 contact each other is the overlapping area. When the cap 2 and the bottom shell 1 move away from each other, the contact area between the first surrounding wall 12 and the second surrounding wall 22 will decrease, and thus the overlapping area will also decrease.

[0034] In one embodiment, a second arc-shaped portion 222 is provided on the second surrounding wall 22, and the second arc-shaped portion 222 is convexly provided toward the center away from the second surrounding wall 22, and at least part of the second notch 221 is located on the second arc-shaped portion 222, and the first surrounding wall 12 is perpendicular to the bottom plate 11, so that an air passage is formed between the second arc-shaped portion 222 and the outer wall of the first surrounding wall 12, and when the accommodating chamber 4 is depressurized, the first notch 121 and the second notch 221 can be connected through the air passage. Since the outer wall of the first surrounding wall 12 is a straight surface, and the inner wall of the second arc-shaped portion 222 is a curved surface, the curved surface and the straight surface cooperate to form an air passage, and the first notch 121 and the second notch 221 are connected through the air passage, and the gas in the accommodating chamber 4 can be released into the air passage through the first notch 121, and then the air passage discharges the gas out of the button battery through the second notch 221, thereby realizing automatic depressurization of the button battery. This design can reduce the relative displacement distance between the cap 2 and the bottom shell 1, can relieve pressure in the accommodating chamber 4 more quickly, improve the pressure relief effect of the button battery, and there are more overlapping areas between the cap 2 and the bottom shell 1 during pressure relief, which can prevent the cap 2 from separating from the bottom shell 1. In addition, by providing a second arc-shaped portion 222 on the second surrounding wall 22, the snap-fitting force between the bottom shell 1 and the cap 2 can be increased to prevent the cap 2 from separating from the bottom shell 1 of the button battery in a normal state. When the button battery needs to relieve pressure, the air pressure in the accommodating chamber 4 is greater than the snap-fitting force between the cap 2 and the bottom shell 1, so as to avoid the snap-fitting force between the cap 2 and the bottom shell 1 being too large and unable to move in opposite directions under the action of air pressure.

[0035] In another embodiment, if Figures 2 to 5As shown, the first surrounding wall 12 includes a first arc-shaped portion 122, a first straight arm 123 and a second straight arm 124. The two ends of the first arc-shaped portion 122 are respectively connected to the first straight arm 123 and the second straight arm 124, and the first straight arm 123 is located above the second straight arm 124. The first straight arm 123 and the second straight arm 124 are both arranged perpendicular to the bottom plate 11. The second surrounding wall 22 includes a second arc-shaped portion 222 and a third straight arm 223. The second arc-shaped portion 222 is arranged to be convex, and the first arc-shaped portion 122 and the second arc-shaped portion 222 are adapted to each other, so that the first arc-shaped portion 122 is attached to the second arc-shaped portion 222, and the first straight arm 123 and the third straight arm 223 are attached to each other, so that the cap 2 can be fastened to the bottom shell 1. This structure can make the fit between the cap 2 and the bottom shell 1 higher, and the buckling force between the bottom shell 1 and the cap 2 is also improved by providing the first arc portion 122 on the first surrounding wall 12 and the second arc portion 222 on the second surrounding wall 22, so as to prevent the cap 2 from being separated from the bottom shell 1 in the normal state of the button battery. When the button battery needs to be depressurized, the air pressure in the accommodating chamber 4 is greater than the buckling force between the bottom shell 1 and the cap 2, so as to avoid the buckling force between the cap 2 and the bottom shell 1 being too large and unable to move in the opposite direction under the action of the air pressure. In addition, the first surrounding wall 12 and the second surrounding wall 22 are provided with the first arc-shaped portion 122 and the second arc-shaped portion 222 which are adapted to each other, which can extend the path for water vapor to enter the battery cell 3, improve the air tightness of the button battery, and extend the service life of the button battery. When the air pressure in the accommodating chamber 4 increases, the cap 2 and the bottom shell 1 move away from each other, so that the second arc-shaped portion 222 moves to the position of the first straight arm 123. Since the outer wall of the first straight arm 123 is a straight surface, and the inner wall of the second arc-shaped portion 222 is a curved surface, the curved surface and the straight surface cooperate to form an airway, and the first notch 121 and the second notch 221 are connected through the airway. The gas in the accommodating chamber 4 can be released into the airway through the first notch 121, and then the airway discharges the gas out of the button battery through the second notch 221, thereby realizing automatic pressure relief of the button battery. This design can reduce the relative displacement distance of the cap 2 and the bottom shell 1, can relieve the pressure of the accommodating chamber 4 faster, and improve the pressure relief effect of the button battery.

[0036] In order to ensure that the first surrounding wall 12 and the second surrounding wall 22 have high strength, the second arc-shaped portion 222 is formed by stamping or rolling the second surrounding wall 22, and the first arc-shaped portion 122 is formed by stamping or rolling the first surrounding wall 12. Moreover, the arc-shaped portion formed by stamping or rolling can not only reduce the manufacturing difficulty, but also form a corresponding groove on the back side of the convex arc-shaped portion, and utilize this groove to accommodate the arc-shaped portion that fits therewith to achieve a tight fit.

[0037] When the accommodating chamber 4 is depressurized, the first notch 121 and the second notch 221 overlap. It is understandable that when the air pressure in the accommodating chamber 4 increases, the cap 2 and the bottom shell 1 move away from each other, and the first notch 121 and the second notch 221 move closer to each other. When the first notch 121 overlaps with the second notch 221, a channel is directly formed between the first notch 121 and the second notch 221, and the accommodating chamber 4 can discharge gas through the channel to adjust the pressure difference inside the button battery.

[0038] Preferably, four first notches 121 and four second notches 221 are provided, and two adjacent first notches 121 are distributed at an angle of 90 degrees on the first surrounding wall 12, and two adjacent second notches 221 are distributed at an angle of 90 degrees on the second surrounding wall 22. The button battery can be depressurized through the four first notches 121 and the four second notches 221 at the same time, which can greatly improve the depressurization speed of the button battery. Moreover, the first notches 121 and the second notches 221 are evenly distributed around the first surrounding wall 12 and the second surrounding wall 22, so that the button battery has a depressurization notch in each area, thereby reducing the transfer of gas in the accommodating cavity 4 and improving the depressurization effect of the button battery.

[0039] Of course, the number of the first notch 121 and the second notch 221 can be set to 1, 2, 3 or other numbers. The actual number of notches can be set according to actual needs and only needs to meet the pressure relief requirements of the button battery.

[0040] In addition, the number of the first notches 121 and the second notches 221 may be different, such as three first notches 121 and only two second notches 221. There is no specific limitation and the setting is flexible.

[0041] In this embodiment, the first notch 121 is a U-shaped structure, and the second notch 221 is a V-shaped structure. The U-shaped and V-shaped structures are simple in shape and are conducive to processing and manufacturing in a workshop. In other embodiments, the first notch 121 is a V-shaped structure, and the second notch 221 is a U-shaped structure, or the first notch 121 and the second notch 221 are both U-shaped structures or V-shaped structures.

[0042] Of course, the shapes of the first notch 121 and the second notch 221 can also be rectangular, semicircular or other shapes.

[0043] Specifically, the bottom shell 1 and the cover cap 2 are both made of metal material. The bottom shell 1 and the cover cap 2 made of metal material have high hardness, so that the entire outer shell of the button battery is a hard shell. The hard shell structure can ensure that the appearance of the entire button battery remains unchanged, and can also effectively prevent the outer shell from being deformed due to the increase of air pressure in the accommodating cavity 4.

[0044] In one embodiment, if Figure 2As shown, a seal 5 is provided between the first surrounding wall 12 and the second surrounding wall 22. The seal 5 completely wraps the first notch 121. The seal 5 is made of elastic material so that the seal 5 has good elasticity. When the air pressure in the accommodating chamber 4 increases, the air pressure can squeeze the seal 5 wrapped at the position of the first notch 121, so that the seal 5 cannot completely cover the first notch 121, thereby making the first notch 121 and the second notch 221 connected and the pressure is released.

[0045] In another embodiment, a seal 5 is provided between the first surrounding wall 12 and the second surrounding wall 22, and a third notch is provided at a position of the seal 5 directly opposite to the first notch 121. By providing the third notch, the first notch 121 can be avoided. When the pressure is released, the seal 5 can be prevented from blocking the first notch 121 and affecting the pressure release function of the button battery. Specifically, the sealing member 5 includes a sealing body 51 sandwiched between the first surrounding wall 12 and the second surrounding wall 22, a first extension portion 52 extends from one end of the sealing body 51 close to the top plate 21 toward the center of the sealing body 51, a second extension portion 53 extends from one end of the first extension portion 52 away from the sealing body 51 toward the bottom plate 11, a portion of the second extension portion 53 is closely attached to the inner wall of the first surrounding wall 12, a third notch is provided on the sealing body 51 and the second extension portion 53, so that the end of the first surrounding wall 12 can be wrapped by the sealing member 5, thereby improving the sealing effect of the button battery, and since the first surrounding wall 12 and the second surrounding wall 22 are provided with the first arc portion 122 and the second arc portion 222, they can compress the sealing body 51, thereby further improving the sealing effect between the bottom shell 1 and the cap 2. In addition, the arc structure can increase the sealing area and improve the sealing effect.

[0046] In addition, the sealing body 51, the first extension portion 52 and the second extension portion 53 are connected to form an installation groove. During installation, the first surrounding wall 12 can be inserted into the installation groove, and the first extension portion 52 abuts against the upper end of the first surrounding wall 12 to complete the installation, thereby improving the installation efficiency of the seal 5.

[0047] The second extension portion 53 can extend to below the first arc-shaped portion 122 , so that the second extension portion 53 and the inner side of the first surrounding wall 12 have a larger contact area, thereby improving the connection stability between the sealing member 5 and the first surrounding wall 12 .

[0048] In the description of this article, it is necessary to understand that the terms "upper", "lower", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In the description of this specification, the description of reference term "an embodiment" etc. means that the specific features, structures, materials or characteristics of the embodiment are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment.

[0050] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 methods that can be understood by those skilled in the art.

[0051] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A button battery, comprising a bottom shell, a cap and a battery cell, wherein the cap is arranged on the bottom shell to form a receiving cavity, and the battery cell is arranged in the receiving cavity, characterized in that: The bottom shell comprises a bottom plate and a first surrounding wall arranged around the bottom plate, the cap comprises a top plate and a second surrounding wall arranged around the top plate, an overlapping area is formed between the first surrounding wall and the second surrounding wall, at least one first notch is formed on the first surrounding wall, at least one second notch is formed on the second surrounding wall, the first notch and the second notch are both located on the overlapping area, the first notch and the second notch are spaced apart, and when the air pressure in the accommodating chamber increases, the air pressure can drive the cap and the bottom shell to move in opposite directions so that the first notch and the second notch are connected; The second surrounding wall is provided with a second arc-shaped portion, the second arc-shaped portion protrudes outward, and at least part of the second notch is located on the second arc-shaped portion, the first surrounding wall is vertically arranged to the bottom plate, so that an air passage is formed between the second arc-shaped portion and the outer wall of the first surrounding wall, and when the accommodating chamber is depressurized, the first notch and the second notch can be communicated through the air passage; The first surrounding wall is convexly provided with a first arc-shaped portion, and the second surrounding wall includes a second arc-shaped portion matching the first arc-shaped portion.

2. The button battery according to claim 1, characterized in that: The first arc-shaped portion is formed by stamping or rolling the first surrounding wall, and the second arc-shaped portion is formed by stamping or rolling the second surrounding wall.

3. The button battery according to claim 1, characterized in that: When the accommodating chamber is depressurized, the first notch and the second notch overlap.

4. The button cell according to claim 1, characterized in that: There are four first notches, and two adjacent first notches are distributed on the first surrounding wall at an angle of 90 degrees; and / or, There are four second notches, and two adjacent second notches are distributed on the second surrounding wall at an angle of 90 degrees between them.

5. The button battery according to claim 1, characterized in that: The first notch is a V-shaped notch or a U-shaped notch; and / or, The second notch is a V-shaped notch or a U-shaped notch.

6. The button cell according to any one of claims 1 to 5, characterized in that: The bottom shell and the cover cap are both made of metal material.

7. The button cell according to claim 1, characterized in that: A sealing member is disposed between the first surrounding wall and the second surrounding wall, and the sealing member completely covers the first notch; or, The sealing member is provided with a third notch at a position directly opposite to the first notch.

8. The button cell according to claim 7, characterized in that: The sealing member covers the end of the first surrounding wall.

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