Button cell

Abstract

The button cell comprises a shell, a cover plate and a flexible blocking piece, the shell comprises an opening and a containing cavity communicated with the opening, the containing cavity is used for containing a roll core, the cover plate is welded to the opening so as to seal the shell, and the blocking piece is arranged on the cover plate. The blocking piece is divided into a connecting part and a first movable part in the height direction, the connecting part is connected with the side wall, close to one end of the opening, of the containing cavity, the first movable part can be bent towards the opening, and the bent first movable part is matched with the cover plate and the side wall to form a shielding area. According to the utility model, the blocking piece is arranged, the first movable part of the blocking piece is bent and then is matched with the cover plate and the side wall of the accommodating cavity to form the shielding area, and welding slag is blocked in the shielding area, so that the welding slag is effectively prevented from entering the battery, and the safety risks of battery short circuit, liquid leakage and the like caused by the welding slag are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, specifically, relate to a button cell. BACKGROUND

[0002] In the battery manufacturing process, laser welding technology is widely used to connect the shell and the cover plate to ensure the integrity and sealing of the battery structure. However, when the flatness of the open end of the shell does not meet the requirements, i.e. there are pits, protrusions or other irregular shapes, it will directly cause uneven gaps between the open end of the shell and the cover plate. During the laser welding process, these gaps may allow the liquid metal generated during welding to penetrate into the battery interior and solidify into welding slag after cooling. The welding slag may flow freely with the electrolyte inside the battery and eventually pierce the separator.

[0003] The separator is a barrier that prevents the positive and negative electrodes from directly contacting each other. Once the separator is pierced by the welding slag, the positive and negative materials of the battery will directly contact each other, causing an internal short circuit in the battery. The internal short circuit not only causes the battery performance to decline, such as capacity loss, voltage drop, etc., but also may cause the battery to overheat, leak, and even explode, etc. serious safety problems. SUMMARY

[0004] The utility model aims at providing a button cell, by setting the blocking piece, the first movable part of the blocking piece is bent and cooperates with the cover plate and the side wall of the accommodating cavity to form a shielding area, the welding slag is blocked in the shielding area, effectively preventing the welding slag from entering the battery interior, reducing the safety risks of battery short circuit, liquid leakage, etc. caused by welding slag.

[0005] A button cell includes a shell, a cover plate, and a flexible blocking piece. The shell includes an opening and an accommodating cavity connected to the opening, the accommodating cavity is used to place the roll core, the cover plate is welded at the opening to seal the shell, the blocking piece is divided into a connecting part and a first movable part along the height direction, the connecting part is connected with the side wall of the accommodating cavity near one end of the opening, the first movable part can be bent towards the opening, and the bent first movable part cooperates with the cover plate and the side wall to form a shielding area.

[0006] In the above technical solution, the blocking piece is a flexible component, which is divided into a connecting part and a first movable part in the height direction. During the battery assembly process, the connecting part is fixed to the side wall of the accommodating cavity near the opening end, which plays a role in connecting and supporting the blocking piece. When the cover plate is placed at the opening of the shell, the first movable part can be deformed by bending towards the opening direction due to its flexibility when subjected to external force. The first movable part after bending, the cover plate and the side wall of the accommodating cavity cooperate to form a shielding area, and the welding slag generated during the welding of the shell and the cover plate is blocked in the shielding area, preventing the welding slag from entering the accommodating cavity, thereby protecting the battery from damage. The utility model discloses a blocking piece, the first movable part of the blocking piece is bent to cooperate with the cover plate and the side wall of the accommodating cavity to form a shielding area, and the welding slag is blocked in the shielding area, effectively preventing the welding slag from entering the battery, reducing the safety risks such as battery short circuit and liquid leakage caused by the welding slag.

[0007] Further, the blocking piece is a high-temperature-resistant foil.

[0008] In the above technical solution, the blocking piece made of high-temperature-resistant foil can better withstand high-temperature environment during welding, reducing deformation or damage caused by thermal stress. This helps to maintain the integrity and effectiveness of the shielding area, ensuring that the welding slag is effectively collected and will not enter the battery due to the failure of the blocking piece.

[0009] Further, the material of the foil is aluminum.

[0010] In the above technical solution, the aluminum foil has small density, light weight, but high strength, and can withstand certain external force without easy deformation or fracture.

[0011] Further, the thickness of the blocking piece is 0.02mm-0.1mm.

[0012] In the above technical solution, within the thickness range of 0.02mm-0.1mm, the blocking piece can effectively prevent the welding slag from entering the accommodating cavity, reducing the risk of fire or explosion caused by battery overheating or short circuit.

[0013] Further, the length of the first movable part is 0.1mm-1.5mm.

[0014] In the above technical solution, the length range of 0.1mm-1.5mm is to ensure that the first movable part can tightly fit the cover plate after bending, avoiding assembly problems caused by too tight or too loose.

[0015] Further, it also includes an adhesive, and the connecting part is connected to the side wall through the adhesive.

[0016] In the above technical solution, the adhesive member (such as double-sided tape, structural adhesive, hot melt adhesive, etc.) can provide stable connecting force to ensure firm combination between the connecting part and the side wall. This connection mode can avoid stress concentration and damage risk that may be caused by mechanical connection (such as screws, buckles, etc.).

[0017] Further, the adhesive member extends at least partially to the first movable part to form a second movable part, when the first movable part is bent, the second movable part away from one side of the first movable part is bonded with the cover plate.

[0018] In the above technical solution, the adhesive member first ensures stable connection between the connecting part and the side wall. By extending to the first movable part and forming the second movable part, the adhesive member realizes dynamic connection between the first movable part and the cover plate. This design allows the first movable part to bend within a certain range while maintaining connection with the cover plate.

[0019] Further, the length of the second movable part is less than the length of the first movable part.

[0020] In the above technical solution, the longer length of the first movable part provides greater bending range and flexibility, while the shorter length of the second movable part can provide necessary support and stability during bending.

[0021] Compared with the prior art, the utility model has the advantages that: by designing the blocking piece, the blocking piece has flexibility, which is divided into a connecting part and a first movable part in the height direction. The connecting part is used for connecting with the inner wall of the accommodating cavity to realize fixation of the blocking piece and the shell. The first movable part extends out of the opening, when the cover plate is arranged on the opening of the shell, the first movable part is bent towards the direction of the opening under stress, the first movable part after bending cooperates with the cover plate and the side wall of the shell to form a shielding area, the welding slag generated by welding of the shell and the cover plate is blocked in the shielding area, and the welding slag is prevented from entering the accommodating cavity, so that the battery is protected from damage. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a perspective view of the shell of the utility model embodiment.

[0023] Figure 2 It is a structure schematic view of the button cell before assembly of the utility model embodiment.

[0024] Figure 3 It is Figure 2 It is an enlarged schematic view of A in the middle.

[0025] Figure 4 It is a structure schematic view of the button cell after assembly of the utility model embodiment.

[0026] Figure 5 It is Figure 4An enlarged schematic view of the middle B.

[0027] Figure 6 A decomposition structure schematic view of the button cell of the embodiment of the utility model.

[0028] Explanation of reference numerals

[0029] 1, shell; 101, opening; 102, accommodating cavity; 1021, side wall;

[0030] 2, cover plate;

[0031] 3, blocking piece; 301, connecting part; 302, first movable part;

[0032] 4, roll core;

[0033] 5, shielding area;

[0034] 6, adhesive piece; 601, second movable part. DETAILED DESCRIPTION

[0035] The button cell of the utility model will be described in further detail below in conjunction with specific embodiments and drawings. The preferred embodiments of the utility model are shown in the drawings. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein.

[0036] Please refer to Figures 1 to 6 In a preferred embodiment, the button cell of the utility model comprises a shell 1, a cover plate 2 and a flexible blocking piece 3, the shell 1 comprises an opening 101 and an accommodating cavity 102 in communication with the opening 101, the accommodating cavity 102 is used for placing a roll core 4, the cover plate 2 is welded at the opening 101 to seal the shell 1, the blocking piece 3 is divided into a connecting part 301 and a first movable part 302 along the height direction, the connecting part 301 is connected with the side wall 1021 of the accommodating cavity 102 close to one end of the opening 101, the first movable part 302 can be bent towards the opening 101, and the bent first movable part 302 cooperates with the cover plate 2 and the side wall 1021 to form a shielding area 5.

[0037] In practical application, the blocking piece 3 is a flexible component, in some embodiments of the present application, the blocking piece 3 is annular and matches the size of the accommodating cavity 102, and the blocking piece 3 is divided into a connecting part 301 and a first movable part 302 along the height direction. During the battery assembly process, the connecting part 301 is fixed on the side wall 1021 of the accommodating cavity 102 near the opening 101 of the shell 1, and plays a role of connecting and supporting the blocking piece 3. For example, the first movable part 302 protrudes from the opening 101 of the shell 1, when the cover plate 2 is placed at the opening 101 of the shell 1, the first movable part 302 can be deformed when subjected to external force due to its flexibility, that is, it will bend towards the opening 101. The first movable part 302 after bending, the cover plate 2 and the side wall 1021 of the accommodating cavity 102 cooperate to form a shielding area 5, and the welding slag generated when the shell 1 and the cover plate 2 are welded is blocked in the shielding area 5, preventing the welding slag from entering the accommodating cavity 102, thereby protecting the battery from damage. By setting the blocking piece 3, the first movable part 302 of the blocking piece 3 cooperates with the cover plate 2 and the side wall 1021 of the accommodating cavity 102 to form a shielding area after bending, and the welding slag is blocked in the shielding area 5, effectively preventing the welding slag from entering the battery interior, reducing the safety risks such as battery short circuit and liquid leakage caused by welding slag. At the same time, due to the setting of the blocking piece 3, the injection height is increased during liquid injection, and single injection can be realized, improving the efficiency and the tolerance caused by multiple injections, and the liquid injection amount control is more accurate.

[0038] It should be noted that when the welding slag is blocked in the shielding area 5, the heat of the welding slag is transferred to the outside through the side wall 1021, thereby achieving heat dissipation, and avoiding the heat from being accumulated in the shielding area 5, which affects the roll core in the battery accommodating cavity 102.

[0039] In the present embodiment, the shell 1 and the cover plate 2 are both made of metal materials, and the shell 1 and the cover plate 2 can be selected from the same or different metals.

[0040] In the present embodiment, the blocking piece 3 is a high-temperature-resistant foil. The high-temperature-resistant foil can maintain the stability of its physical and chemical properties in a high-temperature environment and is not easy to deform or melt. When the welding slag enters the shielding area 5, it still has a relatively high temperature, and the blocking piece 3 made of high-temperature-resistant foil can better withstand the high-temperature environment during welding, reducing deformation or damage caused by thermal stress. This helps to maintain the integrity and effectiveness of the shielding area 5 and ensures that the welding slag is effectively collected and will not enter the battery interior due to the failure of the blocking piece 3.

[0041] Specifically, the material of the foil in the embodiment is aluminum. The aluminum foil has small density, light weight, high strength, and can withstand certain external force without being easily deformed or broken. In practical applications, the aluminum foil can withstand more welding slag, avoiding the first movable part 302 from breaking when the number of welding slag is too large. At the same time, the aluminum foil has a lower price than other metal foils, reducing the use cost.

[0042] It should be noted that in the embodiment, the thickness of the blocking piece 3 is 0.02mm-0.1mm. Within the thickness range of 0.02mm-0.1mm, the blocking piece 3 can effectively prevent welding slag from entering the accommodating cavity 102, reducing the risk of fire or explosion caused by battery overheating or short circuit.

[0043] Further, the length of the first movable part 302 is 0.1mm-1.5mm. The length range of 0.1mm-1.5mm is to ensure that the first movable part can tightly fit the cover plate after being bent, avoiding assembly problems caused by being too tight or too loose.

[0044] It should be noted that the utility model also includes an adhesive piece 6, and the connecting part 301 is connected with the side wall 1021 through the adhesive piece 6. The adhesive piece 6 (such as double-sided tape, structural adhesive, hot melt adhesive, etc.) can provide stable connecting force to ensure the firm combination between the connecting part 301 and the side wall. This connection method can avoid the stress concentration and damage risk that may be caused by mechanical connection (such as screws, buckles, etc.). Moreover, compared with mechanical connection, the adhesive piece 6 has a lower cost, especially in large-scale production. In addition, the adhesive piece 6 can also reduce the material cost and processing cost caused by mechanical connecting parts (such as screws, buckles, etc.).

[0045] Further, the adhesive piece 6 has at least part extending to the first movable part 302 to form a second movable part 601, and when the first movable part 302 is bent, the second movable part 601 away from one side of the first movable part 302 is adhered to the cover plate 2. The adhesive piece 6 first ensures the stable connection between the connecting part 301 and the side wall 1021. By extending to the first movable part 302 and forming the second movable part 601, the adhesive piece 6 realizes the dynamic connection between the first movable part 302 and the cover plate 2. This design allows the first movable part 302 to be bent within a certain range while maintaining the connection with the cover plate 1.

[0046] It should be noted that the length of the second movable part 601 is less than the length of the first movable part 302. The longer length of the first movable part 302 provides greater bending range and flexibility, while the shorter length of the second movable part 601 can provide necessary support and stability during the bending process.

[0047] In the description of the utility model, it is understood that the terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0048] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0049] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0050] Although the description of the utility model is combined with the above specific embodiments, it is obvious that many substitutions, modifications and changes can be made by those skilled in the art according to the above content. Therefore, all such alternatives, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A button cell, characterized by, The barrier piece is made of foil material with high temperature resistance.

2. The button cell of claim 1, wherein, The foil material is made of aluminum.

3. The button cell of claim 2, wherein, The thickness of the barrier piece is 0.02mm-0.1mm.

4. The button cell of claim 1, wherein, The length of the first movable part is 0.1mm-1.5mm.

5. The button cell of claim 1, wherein, The connecting part is connected to the side wall of the accommodating cavity through the adhesive piece.

6. The button cell of claim 1, wherein, The adhesive piece extends to the first movable part to form a second movable part.

7. The button cell of claim 6, wherein, The length of the second movable part is less than that of the first movable part.

8. The button cell of claim 7, wherein, The length of the second movable part is less than that of the first movable part.

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