Button cell

Abstract

The utility model relates to the technical field of batteries, in particular to a button cell. The button cell comprises a shell, a cell, a first cover plate and an insulating glue layer, wherein the shell forms a containing cavity with an opening; the battery cell is arranged in the accommodating cavity; the first cover plate comprises a first end and a second end, the first cover plate is located on the shell, and the first end is located in the containing cavity; the insulating rubber layer is arranged between the shell and the first cover plate and is used for connecting the shell and the first cover plate; one side, close to the second end, of the opening of the shell is provided with a chamfer. According to the button cell, the shell can be prevented from breaking the insulating adhesive layer in the use process of the button cell, so that the first cover plate is prevented from being in contact with the shell to generate a short circuit point, and the use performance and the safety performance of the button cell are improved.

Description

Technical Field

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

[0002] The button battery mainly includes a shell and a cover positive terminal. During the assembly and use of the button battery, an insulating rubber layer is required between the cover positive terminal and the shell to prevent the contact between the cover positive terminal and the shell and cause a short circuit. In the current setting structure, the shell will pierce the insulating rubber layer during use, resulting in a short circuit point, which will eventually cause adverse reactions and bring safety hazards. Utility Model Content

[0003] The technical problem to be solved by the embodiment of the utility model is to provide a button-type battery to solve the problem in the prior art that the shell will pierce the insulating rubber layer to cause a short circuit point, ultimately causing adverse reactions and posing a safety hazard.

[0004] The utility model discloses a button battery, comprising a shell, a battery cell, a first cover plate and an insulating rubber layer, wherein the shell forms a accommodating cavity with an opening; the battery cell is arranged in the accommodating cavity; the first cover plate comprises a first end and a second end in a thickness direction, the first cover plate is located on the shell, and the first end is located in the accommodating cavity; the insulating rubber layer is arranged between the shell and the first cover plate, and is used to connect the shell and the first cover plate; wherein a chamfer is provided on one side of the opening of the shell close to the second end.

[0005] Optionally, the shell includes a main body and a second cover plate located on the main body, the opening is formed on the second cover plate, the main body and the second cover plate cooperate to form the accommodating cavity, and the chamfer is provided on the second cover plate.

[0006] Optionally, the insulating rubber layer includes a first connecting portion and a second connecting portion, the first connecting portion is located between the first cover plate and the second cover plate along the diameter direction of the first cover plate, and the second connecting portion is located between the first cover plate and the second cover plate along the thickness direction.

[0007] Optionally, the thickness of the first connecting portion is greater than the thickness of the second connecting portion.

[0008] Optionally, the thickness of the first connecting portion is greater than or equal to 0.2 mm; the thickness of the second connecting portion is greater than or equal to 0.05 mm.

[0009] Optionally, the chamfer is a circular chamfer, and the radius of the circular chamfer is greater than or equal to 0.2 mm.

[0010] Optionally, the first cover plate is in a T-shaped structure, the second end is an end with a large surface of the T-shaped structure, and the second end is arranged outside the shell.

[0011] Optionally, an insulating layer is further attached to the inner wall of the second cover plate to form insulation between the battery cell and the second cover plate.

[0012] Optionally, one end of the insulating layer is flush with a side edge of the second cover plate located at the opening, and a gap is provided between the other end and a side wall of the main body.

[0013] Optionally, one end of the second cover plate facing away from the opening extends toward the periphery of the main body.

[0014] Compared with the prior art, the beneficial effects of the button battery provided by the embodiment of the utility model are: the accommodating cavity with an opening formed on the shell provides a stable installation environment for the battery cell, and the first cover plate and the insulating rubber layer are provided to seal the opening of the shell after the battery cell is placed. Specifically, the first cover plate is provided on the shell through the insulating rubber layer, and the first end of the first cover plate is located in the accommodating cavity of the shell, so as to achieve sealing of the shell while ensuring the insulation connection between the first cover plate and the shell. Finally, a chamfer is provided on one side of the opening of the shell close to the second end, and the setting of the arc chamfer can increase the contact area between the shell and the insulating rubber layer, thereby preventing the sharp corner of the shell from breaking the insulating rubber layer during the use of the button battery, thereby preventing the first cover plate from contacting the shell to produce a short circuit point, thereby improving the performance and safety of the button battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technical solution of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0016] Figure 1 It is a cross-sectional view of the overall structure of a button-type battery provided by an embodiment of the utility model;

[0017] Figure 2 yes Figure 1 Partial magnified image;

[0018] Figure 3 It is a structural schematic diagram of a housing provided by an embodiment of the utility model;

[0019] Figure 4 It is a structural schematic diagram of the first cover plate provided in an embodiment of the utility model.

[0020] The reference numerals in the figures are:

[0021] 10. Shell; 110. Main body; 120. Second cover; 101. Accommodating cavity; 1001. Opening; 102. Chamfer; 103. Gap; 20. Battery cell; 30. First cover; 310. First end; 320. Second end; 40. Insulating rubber layer; 410. First connecting portion; 420. Second connecting portion; 50. Insulating layer. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.

[0023] The utility model provides a button battery. Figures 1 to 4 As shown, the button battery includes a shell 10, a battery cell 20, a first cover plate 30 and an insulating rubber layer 40, the shell 10 forms a accommodating cavity 101 with an opening 1001; the battery cell 20 is arranged in the accommodating cavity 101; the first cover plate 30 includes a first end 310 and a second end 320 in the thickness direction, the first cover plate 30 is located on the shell 10, and the first end 310 is located in the accommodating cavity 101; the insulating rubber layer 40 is arranged between the shell 10 and the first cover plate 30, and is used to connect the shell 10 and the first cover plate 30, wherein a chamfer 102 is provided on one side of the opening 1001 of the shell 10 close to the second end 320.

[0024] In the button battery of this embodiment, the accommodating cavity 101 with an opening 1001 formed on the shell 10 provides a stable installation environment for the battery cell 20. The first cover plate 30 and the insulating rubber layer 40 are provided to seal the opening 1001 of the shell 10 after the battery cell 20 is placed. Specifically, the first cover plate 30 is provided on the shell 10 through the insulating rubber layer 40, and the first end 310 of the first cover plate 30 is located in the accommodating cavity 101 of the shell 10, so that the shell 10 is sealed while ensuring the insulation connection between the first cover plate 30 and the shell 10. Finally, a chamfer 102 is provided on one side of the opening 1001 of the shell 10 close to the second end 320. The provision of the arc chamfer 102 can increase the contact area between the shell 10 and the insulating rubber layer 40, prevent the sharp corner of the shell 10 from breaking the insulating rubber layer 40 during the use of the button battery, and further prevent the first cover plate 30 from contacting the shell 10 to generate a short circuit point, thereby improving the performance and safety of the button battery.

[0025] During use of the button battery, the positive and negative tabs of the battery cell 20 are connected to the first cover plate 30 and the inner wall of the shell 10 respectively.

[0026] In this embodiment, the first cover plate 30 is a positive terminal. Figure 1 An example is given in which the positive electrode tab of the battery cell 20 is connected to the first cover plate 30 , and the negative electrode tab is connected to the inner wall of the shell 10 .

[0027] Figure 4 The Y direction is the thickness direction.

[0028] As a preferred solution of this embodiment, refer to Figure 3 The shell 10 includes a main body 110 and a second cover plate 120 located on the main body 110 , the second cover plate 120 is formed with the opening 1001 , the main body 110 and the second cover plate 120 cooperate to form a receiving cavity 101 , and a chamfer 102 is provided on the second cover plate 120 .

[0029] In this embodiment, the housing 10 includes a main body 110 and a second cover 120 located on the main body 110, wherein the second cover 120 and the main body 110 are separate structures. During use, the battery cell 20 is first placed in the main body 110, and then the second cover 120 is placed on the main body 110. The second cover 120 and the main body 110 can be fixedly connected by welding. In actual use, the size of the opening is often smaller than the length of the battery cell 20, so the separate setting and connection of the second cover 120 and the main body 110 facilitates the placement of the battery cell 20 in the housing 10. This improves the convenience of the button battery installation procedure.

[0030] As a preferred solution of this embodiment, refer to Figure 2 The insulating rubber layer 40 includes a first connecting portion 410 and a second connecting portion 420. The first connecting portion 410 is located between the first cover plate 30 and the second cover plate 120 along the diameter direction of the first cover plate 30, and the second connecting portion 420 is located between the first cover plate 30 and the second cover plate 120 along the thickness direction.

[0031] Among them, the insulating rubber layer 40 is composed of a first connecting part 410 and a second connecting part 420, so that the first connecting part 410 connects the first end 310 and the second cover plate 120 along the diameter direction of the first cover plate 30, and the second connecting part 420 connects the second end 320 and the second cover plate 120 along the thickness direction, thereby improving the connection strength and insulation performance between the first cover plate 30 and the second cover plate 120, thereby preventing the first cover plate 30 and the second cover plate 120 from contacting and generating a short circuit point.

[0032] As a preferred solution of this embodiment, refer to Figure 2 , the thickness of the first connection portion 410 is greater than the thickness of the second connection portion 420 .

[0033] As a preferred solution of this embodiment, refer to Figure 2 , the thickness of the first connection portion 410 is greater than or equal to 0.2 mm; the thickness of the second connection portion 420 is greater than or equal to 0.05 mm.

[0034] The arrangement relationship between the first connection part 410 and the second connection part 420 is to prevent the first cover plate 30 from contacting the second cover plate 120 and causing a short circuit. The specific dimensions of the first connection part 410 and the second connection part 420 are adaptively adjusted according to the dimensions of the housing 10 and the actual use environment of the button battery. This embodiment does not specifically limit this. Figure 2 , a represents the thickness of the first connection portion 410 , and c represents the thickness of the second connection portion 420 .

[0035] As a preferred solution of this embodiment, refer to Figure 2 The chamfer 102 is a circular chamfer, and the radius of the circular chamfer is greater than or equal to 0.2 mm.

[0036] Among them, the setting of the arc chamfer can further prevent the shell 10 from piercing the insulating rubber layer 40, thereby improving the overall safety performance. The size limit of the arc chamfer can ensure the contact surface area between the first cover plate 30 and the second cover plate 120, ensure the safety and stability of the insulating rubber layer 40 when in use, further improve the insulation stability between the first cover plate 30 and the second cover plate 120, and prevent the first cover plate 30 from contacting the second cover plate 120 to generate a short circuit point. Figure 2 , R represents the radius of the arc chamfer.

[0037] As a preferred solution of this embodiment, refer to Figure 2 and Figure 4 The first cover plate 30 is in a T-shaped structure, the second end 320 is a large surface end of the T-shaped structure, and the second end 320 is disposed outside the shell 10 .

[0038] The T-shaped structure of the first cover plate 30 improves the connection stability of the first cover plate 30 on the housing 10, and makes the force distribution of the first cover plate 30 and the insulating rubber layer 40 even when in contact, thereby improving the stability of the first cover plate 30. Furthermore, the second end 320 of the first cover plate 30 is the large surface end of the T-shaped structure, and the second end 320 is arranged outside the housing 10, which can increase the contact area between the first cover plate 30 and the external test structure, and improve the test efficiency when testing the memory of button-type batteries with smaller sizes.

[0039] As a preferred solution of this embodiment, refer to Figure 1 An insulating layer 50 is also attached to the inner wall of the second cover plate 120 to form insulation between the battery cell 20 and the second cover plate 120 .

[0040] The insulating layer 50 is provided to prevent the battery cell 20 from contacting the second cover plate 120 and causing a short circuit, thereby further improving the overall performance of the button battery.

[0041] As a preferred solution of this embodiment, refer to Figure 1One end of the insulating layer 50 is flush with the side of the second cover plate 120 located at the opening 1001 , and a gap 103 is defined between the other end and the side wall of the main body 110 .

[0042] Among them, one end of the insulating layer 50 is flush with the side of the second cover plate 120 located at the opening 1001, preventing the end of the second cover plate 120 close to the opening 1001 from contacting the battery cell 20, and a gap 103 is provided between the other end of the insulating layer 50 and the side wall of the shell 10, and the gap 103 is provided to provide a welding point for the connection between the main body 110 and the second cover plate 120, so as to facilitate the connection between the main body 110 and the second cover plate 120, and the size of the gap 103 is set to meet the conditions of the welding point, so that the insulating layer 50 can prevent the battery cell 20 from contacting the second cover plate 120 as much as possible. The gap 103 can be adaptively adjusted based on the size of the actual product, and is not specifically limited here.

[0043] As a preferred solution of this embodiment, refer to Figure 1 , one end of the second cover plate 120 facing away from the opening 1001 extends toward the periphery of the body 110. The above arrangement can increase the welding contact area between the second cover plate 120 and the outer wall of the body 110, thereby increasing the connection strength between the two.

[0044] The body 110 and the second cover plate 120 of the housing 10 in this embodiment are both made of metal materials, such as steel. The first cover plate 30 is made of conductive material.

[0045] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present utility model.

Claims

1. A button battery, characterized in that: include: A housing (10), wherein the housing (10) forms a receiving cavity (101) having an opening (1001); A battery core (20), the battery core (20) being arranged in the accommodating cavity (101); a first cover plate (30), the first cover plate (30) comprising a first end (310) and a second end (320) in a thickness direction, the first cover plate (30) being located on the housing (10), and the first end (310) being located in the accommodating cavity (101); an insulating rubber layer (40), the insulating rubber layer (40) being disposed between the shell (10) and the first cover plate (30) and being used to connect the shell (10) and the first cover plate (30); Wherein, a chamfer (102) is provided on one side of the opening (1001) of the shell (10) close to the second end (320).

2. The button battery according to claim 1, characterized in that: The shell (10) comprises a main body (110) and a second cover plate (120) located on the main body (110), the opening (1001) is formed on the second cover plate (120), the main body (110) and the second cover plate (120) cooperate to form the accommodating cavity (101), and the chamfer (102) is provided on the second cover plate (120).

3. The button battery according to claim 2, characterized in that: The insulating rubber layer (40) comprises a first connecting portion (410) and a second connecting portion (420), wherein the first connecting portion (410) is located between the first cover plate (30) and the second cover plate (120) along the diameter direction of the first cover plate (30), and the second connecting portion (420) is located between the first cover plate (30) and the second cover plate (120) along the thickness direction.

4. The button cell according to claim 3, characterized in that: The thickness of the first connection portion (410) is greater than the thickness of the second connection portion (420).

5. The button cell according to claim 4, characterized in that: The thickness of the first connecting portion (410) is greater than or equal to 0.2 mm; the thickness of the second connecting portion (420) is greater than or equal to 0.05 mm.

6. The button battery according to claim 1, characterized in that: The chamfer (102) is a circular chamfer, and the radius of the circular chamfer is greater than or equal to 0.2 mm.

7. The button cell according to claim 2, characterized in that: The first cover plate (30) is in a T-shaped structure, the second end (320) is an end with a large surface of the T-shaped structure, and the second end (320) is arranged outside the shell (10).

8. The button cell according to claim 7, characterized in that: An insulating layer (50) is also attached to the inner wall of the second cover plate (120) to form insulation between the battery core (20) and the second cover plate (120).

9. The button cell according to claim 8, characterized in that: One end of the insulating layer (50) is flush with the side edge of the second cover plate (120) located at the opening (1001), and a gap (103) is provided between the other end and the side wall of the main body (110).

10. The button cell according to claim 9, characterized in that: One end of the second cover plate (120) that is away from the opening (1001) extends toward the periphery of the main body (110).

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