Button battery housing, button battery and assembly method

Abstract

The present invention provides a button battery housing, a button battery and an assembly method, wherein the button battery housing includes two end caps that interlock with each other, respectively denoted as a first end cap and a second end cap, a first injection-molded layer is provided at the side wall of the first end cap, a second injection-molded layer is provided at the side wall of the second end cap, an end face of the first injection-molded layer contacts an end face of the second injection-molded layer to form a seam, the seam is located inside the side wall of one of the end caps, the seam is heated outside the end caps so that the two end caps are sealed to form a receiving cavity for accommodating a battery cell; an annular notch is provided at the outer edge of the end of the second injection-molded layer and / or the first injection-molded layer, the annular notch and the side wall of the end cap form an annular cavity for accommodating overflowed glue after heating and melting. The above two structural designs are conducive to maintaining good sealing and ensuring a complete and flawless appearance.

Description

Technical Field

[0001] The invention belongs to the technical field of button batteries and relates to a button battery housing, a button battery and an assembling method. Background Art

[0002] Button batteries refer to batteries with the appearance and dimensions of a button. Generally speaking, they are larger in diameter and thinner in thickness. Button batteries are divided into two categories: chemical batteries and physical batteries. Among them, chemical batteries are the most commonly used, and are mainly composed of an anode, a cathode and an electrolyte. Because of their small size, button batteries have been widely used in various microelectronic products, such as: computer motherboards, electronic watches, electronic dictionaries, electronic scales, remote controls, electric toys, pacemakers, electronic hearing aids, counters, and cameras. In order to ensure the performance of products equipped with button batteries, the performance of button batteries has also received more and more attention.

[0003] Metal round button batteries are button batteries that are more frequently used in the market. The shape, appearance and size of this type of battery are similar to buttons, with a larger diameter and thinner thickness. They are often used as backup power sources for various electronic products. There are many types of button batteries. According to the materials used, they can be divided into silver oxide batteries, lithium batteries, alkaline manganese batteries, etc. There are certain differences in the advantages and disadvantages of button batteries made of different materials. You can choose a more suitable button battery according to different equipment to maximize the advantages of button batteries. As a type of button battery, a chemical battery consists of an anode, a cathode, and an electrolyte. The surface is made of stainless steel and serves as the positive electrode. The negative electrode is a stainless steel round cover. There is a sealing ring between the positive and negative electrodes for insulation. The sealing ring is made of nylon. In addition to insulation, the sealing ring can also prevent electrolyte leakage. It is the most commonly used type of button battery.

[0004] CN211404539U discloses a shell assembly of a button battery, a button battery and an electronic product, wherein the shell assembly of the button battery comprises a shell, wherein the shell comprises a first conductive portion and a second conductive portion which are insulated from each other, wherein the first conductive portion and the second conductive portion enclose a receiving cavity for receiving a battery cell of the button battery, wherein the battery cell comprises a first pole ear and a second pole ear, wherein the first pole ear is electrically connected to the first conductive portion, and the second pole ear is electrically connected to the second conductive portion; the first conductive portion comprises two end faces which are arranged opposite to each other and a side face between the two end faces, wherein at least a portion of at least one end face protrudes in a direction away from the battery cell to form at least two protrusions, so as to increase the internal space of the shell assembly of the button battery, thereby facilitating improving the performance of the button battery.

[0005] CN214313350U A button battery case and a button battery. The button battery case comprises a main shell and a cover plate, the main shell is an electrical insulation shell with a receiving cavity, the receiving cavity is provided with an opening, the cover plate is provided at the end of the opening and covers the receiving cavity; the cover plate comprises a first conductor part, a second conductor part and an insulating part provided between the first conductor part and the second conductor part and used to prevent the first conductor part and the second conductor part from being connected to each other, the insulating part has a first end face and a second end face which are arranged opposite to each other, and the first end face and the second end face are both facing the side wall of the receiving cavity, the first conductor part extends from the first end face toward the side wall directly opposite to the first end face, and the second conductor part extends from the second end face toward the side wall directly opposite to the second end face.

[0006] CN112201881A discloses a button-type battery shell, comprising a positive metal end cap and a negative metal end cap, wherein the positive metal end cap comprises a first end cap and a first surrounding wall arranged on one side of the first end cap, and the negative metal end cap comprises a second end cap and a second surrounding wall arranged on one side of the second end cap; the positive metal end cap and the negative metal end cap are arranged relative to each other so that the end of the first surrounding wall and the end of the second surrounding wall are arranged relative to each other and spaced apart, a first insulating kit is arranged on the first surrounding wall, and a second insulating kit is arranged on the second surrounding wall, the first insulating kit and the second insulating kit are connected at the joint surface to form an insulating shell of an integrated structure, and the insulating shell integrated structure forms a receiving cavity with the positive metal end cap and the negative metal end cap for accommodating a battery cell.

[0007] However, during the heat sealing process of the button battery housing, the appearance of the button battery is not beautiful due to glue overflow in the injection molding layer. Therefore, it is necessary to improve the structure of the existing button battery housing to solve the problem of poor appearance. Summary of the invention

[0008] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a button battery shell, a button battery and an assembly method. The present invention changes the position of the first injection layer and the second injection layer so that the joint between the first injection layer and the second injection layer is inside the shell, and the shell outside corresponding to the joint is heated so that the first injection layer and the second injection layer inside the shell are melted and heat-sealed, while the shell outside is still the outer wall of the end cover; in addition, an annular notch is provided at the outer edge of the end of the second injection layer and / or the first injection layer, so that the melt formed after heating and melting flows into the annular notch, and the extrusion during heating prevents the melt from overflowing from the outside of the shell to form burrs. The above two structural designs are conducive to maintaining good sealing and ensuring a complete and flawless appearance.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] In a first aspect, the present invention provides a button-type battery housing, the button-type battery housing comprising two end caps that are buckled with each other, respectively denoted as a first end cap and a second end cap, a first injection-molded layer is provided at a side wall of the first end cap, a second injection-molded layer is provided at a side wall of the second end cap, an end surface of the first injection-molded layer contacts an end surface of the second injection-molded layer to form a seam, the seam is located inside the side wall of one of the end caps, and the seam is heated outside the end caps so that the two end caps are sealed to form a receiving cavity for accommodating a battery cell;

[0011] An annular notch is provided at the outer edge of the end of the second injection layer and / or the first injection layer. The annular notch and the side wall of the end cover form an annular cavity for accommodating overflowed glue after heating and melting.

[0012] The button battery shell provided by the present invention is mainly an improvement plan for the poor appearance problems such as glue overflow, burrs and indentations existing in the previously applied CN112201881A. The button battery shell disclosed in CN112201881A is formed by buckling together a positive metal end cover and a negative metal end cover, and the positive metal end cover and the negative metal end cover are heat-sealed by hot-melting the joints of the first insulating kit and the second insulating kit. However, there are also many technical problems that affect the appearance, which are mainly manifested in that: the first insulating kit and the second insulating kit are located outside the end cover, and glue overflow will occur after being heated and melted under the action of the clamp. After cooling, a circle of burrs and indentations are formed on the outer wall of the button battery, affecting the appearance of the battery. Therefore, in response to the above appearance problems, the present application has made an improved solution, which continues to maintain the advantages of the original two-component type, namely, simple structure, good welding and sealing effect, low cost, high production efficiency and high qualified rate. The position of the first injection layer and the second injection layer is changed, so that the joint between the first injection layer and the second injection layer is inside the shell, and the shell outside corresponding to the joint is heated, so that the first injection layer and the second injection layer inside the shell are melted and heat-sealed, while the shell outside is still the outer wall of the end cover; in addition, an annular notch is provided at the outer edge of the end of the second injection layer and / or the first injection layer, so that the melt formed after heating and melting flows into the annular notch, and the extrusion during heating prevents the melt from overflowing the outside of the shell to form burrs. The above two structural designs are conducive to maintaining good sealing and ensuring a complete and flawless appearance.

[0013] As a preferred technical solution of the present invention, the side wall size of the first end cover is larger than the side wall size of the second end cover.

[0014] As a preferred technical solution of the present invention, the first injection molded layer is provided on the inner circumference of the side wall of the first end cover, and the second injection molded layer is provided on the inner circumference of the side wall of the second end cover; the end surface of the first injection molded layer is lower than the open end surface of the first end cover, and the end surface of the second injection molded layer is higher than the open end surface of the second end cover.

[0015] After the first end cap and the second end cap are buckled together, at least part of the second injection layer extends into the side wall of the first end cap and contacts the end surface of the first injection layer to form a seam, and the seam is located inside the side wall of the first end cap.

[0016] As a preferred technical solution of the present invention, the first injection molded layer is provided on the inner circumference of the side wall of the first end cover, and the second injection molded layer is provided on the outer circumference of the side wall of the second end cover; the end surface of the first injection molded layer is lower than the open end surface of the first end cover, and the end surface of the second injection molded layer is lower than the open end surface of the second end cover.

[0017] After the first end cover and the second end cover are buckled with each other, at least a portion of the side wall of the second end cover is buckled into the first end cover, and a seam formed by the contact between the end surface of the first injection-molded layer and the end surface of the second injection-molded layer is located between the inner wall surface of the first end cover and the outer wall surface of the second end cover.

[0018] As a preferred technical solution of the present invention, the end surface of the first injection-molded layer and the end surface of the second injection-molded layer are both inclined surfaces.

[0019] As a preferred technical solution of the present invention, the material of the first injection layer and the second injection layer is thermoplastic material.

[0020] Preferably, the materials of the first injection-molded layer and the second injection-molded layer are independently selected from polyethylene, polyvinyl chloride, polypropylene, polystyrene or acrylonitrile-butadiene-styrene.

[0021] As a preferred technical solution of the present invention, the side wall diameter of the first end cover is 8 to 16 mm, for example, it can be 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm, 14.5 mm, 15 mm, 15.5 mm or 16 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0022] Preferably, the height of the button-type battery shell formed by the first end cover and the second end cover being buckled together is 3 to 6 mm, for example, it can be 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm or 6.0 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0023] Preferably, the thickness of the first injection-molded layer and the second injection-molded layer are independently 0.2 to 1 mm, for example, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1.0 mm, but are not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0024] Preferably, the thickness of the first end cap and the second end cap are independently 0.1 to 0.2 mm, for example, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm or 0.2 mm, but are not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0025] In a second aspect, the present invention provides a button-type battery, which includes the button-type battery housing described in the first aspect and a battery cell located inside the button-type battery housing.

[0026] As a preferred technical solution of the present invention, the battery cell is a wound battery cell or a stacked battery cell.

[0027] Preferably, the battery cell is a wound battery cell, and a winding center axis of the battery cell is perpendicular to the first end cover and the second end cover.

[0028] Preferably, the battery cell is a stacked battery cell, and a stacking surface of the battery cell is parallel to the first end cover and the second end cover.

[0029] In a third aspect, the present invention provides an assembly method of the button battery according to the first aspect, the assembly method comprising:

[0030] Place the battery cell into one of the end covers, buckle the other end cover, heat the seam between the first injection molded layer and the second injection molded layer on the outside of the end cover, melt the first injection molded layer and the second injection molded layer and then cool them to achieve heat sealing between the two end covers; apply pressure to the end cover while heating, and the melt formed after the first injection molded layer and the second injection molded layer are melted overflows and fills the annular gap during the pressurization process.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The button battery shell provided by the present invention is mainly an improvement plan for the poor appearance problems such as glue overflow, burrs and indentations existing in the previously applied CN112201881A. The button battery shell disclosed in CN112201881A is formed by buckling together a positive metal end cover and a negative metal end cover, and the positive metal end cover and the negative metal end cover are heat-sealed by hot-melting the joints of the first insulating kit and the second insulating kit. However, there are also many technical problems that affect the appearance, which are mainly manifested in that: the first insulating kit and the second insulating kit are located outside the end cover, and glue overflow will occur after being heated and melted under the action of the clamp. After cooling, a circle of burrs and indentations are formed on the outer wall of the button battery, affecting the appearance of the battery. Therefore, in response to the above appearance problems, the present application has made an improved solution, which continues to maintain the advantages of the original two-component type, namely, simple structure, good welding and sealing effect, low cost, high production efficiency and high qualified rate. The position of the first injection layer and the second injection layer is changed, so that the joint between the first injection layer and the second injection layer is inside the shell, and the shell outside corresponding to the joint is heated, so that the first injection layer and the second injection layer inside the shell are melted and heat-sealed, while the shell outside is still the outer wall of the end cover; in addition, an annular notch is provided at the outer edge of the end of the second injection layer and / or the first injection layer, so that the melt formed after heating and melting flows into the annular notch, and the extrusion during heating prevents the melt from overflowing the outside of the shell to form burrs. The above two structural designs are conducive to maintaining good sealing and ensuring a complete and flawless appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the structure of a button-type battery housing provided in Example 1 of the present invention;

[0034] Figure 2 A schematic diagram of the structure of a button-type battery housing provided in Example 2 of the present invention;

[0035] Figure 3 A schematic diagram of the structure of a button-type battery housing provided in Example 3 of the present invention;

[0036] Figure 4 A schematic diagram of the structure of a button-type battery housing provided in Example 4 of the present invention;

[0037] Figure 5 A schematic diagram of the structure of a button-type battery housing provided in Example 5 of the present invention;

[0038] Among them, 1-first end cover; 2-first injection molding layer; 3-second end cover; 4-second injection molding layer. DETAILED DESCRIPTION

[0039] It should be understood that, in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, 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. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0040] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0041] The technical solution of the present invention is further illustrated below through specific implementation methods.

[0042] In a specific embodiment, the present invention provides a button battery housing, the button battery housing is as follows Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, it includes two end caps that are buckled with each other, which are respectively denoted as a first end cap 1 and a second end cap 3. A first injection-molded layer 2 is provided at the side wall of the first end cap 1, and a second injection-molded layer 4 is provided at the side wall of the second end cap 3. The end surface of the first injection-molded layer 2 contacts the end surface of the second injection-molded layer 4 to form a seam, and the seam is located inside the side wall of one of the end caps. The seam is heated outside the end caps so that the two end caps are sealed to form a receiving cavity for accommodating the battery cell.

[0043] An annular notch is provided at the outer edge of the end of the second injection-molded layer 4 and / or the first injection-molded layer 2 , and the annular notch and the side wall of the end cover form an annular cavity for accommodating overflowed glue after heating and melting.

[0044] The button battery shell provided by the present invention is mainly an improvement plan for the poor appearance problems such as glue overflow, burrs and indentations existing in the previously applied CN112201881A. The button battery shell disclosed in CN112201881A is formed by buckling together a positive metal end cover and a negative metal end cover, and the positive metal end cover and the negative metal end cover are heat-sealed by hot-melting the joints of the first insulating kit and the second insulating kit. However, there are also many technical problems that affect the appearance, which are mainly manifested in that: the first insulating kit and the second insulating kit are located outside the end cover, and glue overflow will occur after being heated and melted under the action of the clamp. After cooling, a circle of burrs and indentations are formed on the outer wall of the button battery, affecting the appearance of the battery. Therefore, in response to the above appearance problems, the present application has made an improved solution, which continues to maintain the advantages of the original two-component type, namely, simple structure, good welding and sealing effect, low cost, high production efficiency and high qualified rate, and changes the position of the first injection layer 2 and the second injection layer 4, so that the joint between the first injection layer 2 and the second injection layer 4 is inside the shell, and the shell outside corresponding to the joint is heated, so that the first injection layer 2 and the second injection layer 4 inside the shell are melted and heat-sealed, while the shell outside is still the outer wall of the end cover; in addition, an annular notch is provided at the outer edge of the end of the second injection layer 4 and / or the first injection layer 2, so that the melt formed after heating and melting flows into the annular notch, and the extrusion during heating prevents the melt from overflowing the outside of the shell to form burrs. The above two structural designs are conducive to maintaining good sealing and ensuring a complete and flawless appearance.

[0045] Furthermore, the side wall size of the first end cover 1 is larger than the side wall size of the second end cover 3 .

[0046] Furthermore, the first injection-molded layer 2 is disposed on the inner circumference of the side wall of the first end cover 1, and the second injection-molded layer 4 is disposed on the inner circumference of the side wall of the second end cover 3; the end surface of the first injection-molded layer 2 is lower than the open end surface of the first end cover 1, and the end surface of the second injection-molded layer 4 is higher than the open end surface of the second end cover 3;

[0047] After the first end cover 1 and the second end cover 3 are buckled together, at least part of the second injection layer 4 extends into the side wall of the first end cover 1 and contacts the end surface of the first injection layer 2 to form a seam, and the seam is located inside the side wall of the first end cover 1.

[0048] Furthermore, the first injection-molded layer 2 is disposed on the inner circumference of the side wall of the first end cover 1, and the second injection-molded layer 4 is disposed on the outer circumference of the side wall of the second end cover 3; the end surface of the first injection-molded layer 2 is lower than the open end surface of the first end cover 1, and the end surface of the second injection-molded layer 4 is lower than the open end surface of the second end cover 3;

[0049] After the first end cover 1 and the second end cover 3 are buckled with each other, at least a portion of the side wall of the second end cover 3 is buckled into the first end cover 1, and the seam formed by the contact between the end surface of the first injection-molded layer 2 and the end surface of the second injection-molded layer 4 is located between the inner wall surface of the first end cover 1 and the outer wall surface of the second end cover 3.

[0050] Furthermore, the end surface of the first injection-molded layer 2 and the end surface of the second injection-molded layer 4 are both inclined surfaces.

[0051] Furthermore, the first injection-molded layer 2 and the second injection-molded layer 4 are made of thermoplastic material.

[0052] Furthermore, the materials of the first injection layer 2 and the second injection layer 4 are independently selected from polyethylene, polyvinyl chloride, polypropylene, polystyrene or acrylonitrile-butadiene-styrene.

[0053] Furthermore, the side wall diameter of the first end cover 1 is 8-16 mm.

[0054] Furthermore, the height of the button-type battery housing formed by buckling the first end cover 1 and the second end cover 3 is 3 to 6 mm.

[0055] Furthermore, the thickness of the first injection-molded layer 2 and the second injection-molded layer 4 are independently 0.2 to 1 mm.

[0056] Preferably, the thickness of the first end cover 1 and the second end cover 3 are independently 0.1-0.2 mm.

[0057] In another specific embodiment, the present invention provides a button-type battery, which includes the button-type battery housing described above and a battery cell located inside the button-type battery housing.

[0058] Furthermore, the battery cell is a wound battery cell or a stacked battery cell.

[0059] Furthermore, the battery cell is a wound battery cell, and the winding center axis of the battery cell is perpendicular to the first end cover and the second end cover;

[0060] Furthermore, the battery cell is a stacked battery cell, and a stacking surface of the battery cell is parallel to the first end cover and the second end cover.

[0061] In another specific embodiment, the present invention provides a method for assembling the button battery, the method comprising:

[0062] Place the battery cell into one of the end covers, buckle the other end cover, heat the joint between the first injection molded layer 2 and the second injection molded layer 4 on the outside of the end cover, heat and melt the first injection molded layer 2 and the second injection molded layer 4 and then cool them to achieve heat sealing between the two end covers; apply pressure to the end cover while heating, and the melt formed after the first injection molded layer 2 and the second injection molded layer 4 melt overflows and fills the annular gap during the pressurization process.

[0063] Example 1

[0064] This embodiment provides a button-type battery housing, wherein the button-type battery housing is as follows: Figure 1 As shown, it includes two end covers that are interlocked, respectively denoted as a first end cover 1 and a second end cover 3 , and the side wall size of the first end cover 1 is larger than the side wall size of the second end cover 3 .

[0065] The first end cap 1 is provided with a first injection layer 2 on the inner circumference of the side wall, and the second end cap 3 is provided with a second injection layer 4 on the outer circumference of the side wall. The end faces of the first injection layer 2 and the second injection layer 4 are both inclined surfaces; the end face of the first injection layer 2 is lower than the open end face of the first end cap 1, and the end face of the second injection layer 4 is lower than the open end face of the second end cap 3. After the first end cap 1 and the second end cap 3 are buckled together, at least part of the side wall of the second end cap 3 is buckled into the first end cap 1, and the seam formed by the contact between the end face of the first injection layer 2 and the end face of the second injection layer 4 is located between the inner wall surface of the first end cap 1 and the outer wall surface of the second end cap 3. The outer circumferential wall of the second end face 3 and the outer circumferential wall of the first end cap 1 are located on the same annular surface, and the seam is heated on the outside of the end cap so that the two end caps are sealed to form a receiving cavity for accommodating the battery cell.

[0066] An annular notch is provided at the outer edge of the end of the second injection-molded layer 4, and the annular notch and the side wall of the end cover form an annular cavity. When heating, pressure is applied to the end cover, and the melt formed by melting the first injection-molded layer 2 and the second injection-molded layer 4 overflows and fills the annular cavity during the pressurization process.

[0067] The first injection layer 2 and the second injection layer 4 are both made of polyethylene. The first end cap 1 and the second end cap 3 are made of stainless steel. The side wall diameter of the first end cap 1 is 12 mm, and the height of the button battery housing formed by the first end cap 1 and the second end cap 3 is 5.4 mm. The thickness of the first injection layer and the second injection layer is independently 0.4 mm, and the thickness of the first end cap and the second end cap is independently 0.12 mm.

[0068] Example 2

[0069] This embodiment provides a button-type battery housing, wherein the button-type battery housing is as follows: Figure 2As shown, it includes two end covers that are interlocked, respectively denoted as a first end cover 1 and a second end cover 3 , and the side wall size of the first end cover 1 is larger than the side wall size of the second end cover 3 .

[0070] The first end cover 1 has a first injection layer 2 disposed on its inner circumference, and the second end cover 3 has a second injection layer 4 disposed on its outer circumference. The end faces of the first injection layer 2 and the second injection layer 4 are both inclined surfaces. The end face of the first injection layer 2 is lower than the open end face of the first end cover 1, and the end face of the second injection layer 4 is higher than the open end face of the second end cover 3. The open edge of the side wall of the second end cover 3 is a flange structure (such as Figure 2 As shown). After the first end cap 1 and the second end cap 3 are buckled together, at least part of the second injection layer 4 extends into the inside of the side wall of the first end cap 1 and contacts the end surface of the first injection layer 2 to form a seam, the seam is located inside the side wall of the first end cap 1, the inner wall surface of the first end cap 1 and the outer wall surface of the second injection layer 2 are located on the same annular surface, and the seam is heated outside the end caps so that the two end caps are sealed to form a receiving cavity for accommodating the battery cell.

[0071] An annular notch is provided at the outer edge of the end of the second injection-molded layer 4, and the annular notch and the side wall of the end cover form an annular cavity. When heating, pressure is applied to the end cover, and the melt formed by melting the first injection-molded layer 2 and the second injection-molded layer 4 overflows and fills the annular cavity during the pressurization process.

[0072] The material of the first injection molding layer 2 is polyethylene, and the material of the second injection molding layer 4 is polyvinyl chloride. The material of the first end cap 1 and the second end cap 3 is stainless steel. The side wall diameter of the first end cap 1 is 8 mm, and the height of the button battery housing formed by the first end cap 1 and the second end cap 3 is 3 mm. The thickness of the first injection molding layer and the second injection molding layer is independently 0.2 mm, and the thickness of the first end cap and the second end cap is independently 0.1 mm.

[0073] Example 3

[0074] This embodiment provides a button-type battery housing, wherein the button-type battery housing is as follows: Figure 3 As shown, it includes two end covers that are interlocked, respectively denoted as a first end cover 1 and a second end cover 3 , and the side wall size of the first end cover 1 is larger than the side wall size of the second end cover 3 .

[0075] The first end cap 1 is provided with a first injection layer 2 on the inner circumference of the side wall, and the second end cap 3 is provided with a second injection layer 4 on the inner circumference of the side wall. The end faces of the first injection layer 2 and the second injection layer 4 are both inclined surfaces; the end face of the first injection layer 2 is lower than the open end face of the first end cap 1, and the end face of the second injection layer 4 is higher than the open end face of the second end cap 3. After the first end cap 1 and the second end cap 3 are buckled together, at least part of the second injection layer 4 extends into the inside of the side wall of the first end cap 1 and contacts with the end face of the first injection layer 2 to form a seam. The seam is located inside the side wall of the first end cap 1, and the inner wall surface of the first end cap 1 and the outer wall surface of the second injection layer 2 are located on the same annular surface. The seam is heated on the outside of the end cap so that the two end caps are sealed to form a housing cavity for accommodating the battery cell.

[0076] An annular notch is provided at the outer edge of the end of the second injection-molded layer 4, and the annular notch and the side wall of the end cover form an annular cavity. When heating, pressure is applied to the end cover, and the melt formed by melting the first injection-molded layer 2 and the second injection-molded layer 4 overflows and fills the annular cavity during the pressurization process.

[0077] The first injection layer 2 and the second injection layer 4 are both made of polypropylene. The first end cap 1 and the second end cap 3 are made of iron with nickel infiltrated on the surface. The side wall diameter of the first end cap 1 is 10 mm, and the height of the button battery housing formed by the first end cap 1 and the second end cap 3 is 4 mm. The thickness of the first injection layer and the second injection layer is independently 0.3 mm, and the thickness of the first end cap and the second end cap is independently 0.15 mm.

[0078] Example 4

[0079] This embodiment provides a button-type battery housing, wherein the button-type battery housing is as follows: Figure 4 As shown, it includes two end covers that are interlocked, respectively denoted as a first end cover 1 and a second end cover 3 , and the side wall size of the first end cover 1 is larger than the side wall size of the second end cover 3 .

[0080] A first injection-molded layer 2 is provided on the inner circumference of the side wall of the first end cover 1, and the end face of the first injection-molded layer 2 is lower than the open end face of the first end cover 1; a second injection-molded layer 4 is provided on the inner circumference and outer circumference of the side wall of the second end cover 3, and the end faces of the first injection-molded layer 2 and the second injection-molded layer 4 are both inclined surfaces; the second injection-molded layer 4 completely wraps the side wall of the second end cover 3, and the end face of the second injection-molded layer 4 is higher than the open end face of the second end cover 3.

[0081] After the first end cover 1 and the second end cover 3 are buckled together, at least part of the second injection-molded layer 4 extends into the side wall of the first end cover 1 and contacts the end face of the first injection-molded layer 2 to form a seam, and the seam is located inside the side wall of the first end cover 1, and the outer wall surface of the first end cover 1 and the outer wall surface of the second injection-molded layer 2 are located on the same annular surface, and the seam is heated on the outside of the end cover so that the two end covers are sealed to form a housing cavity for accommodating the battery cell.

[0082] An annular notch is provided at the outer edge of the end of the second injection-molded layer 4, and the annular notch and the side wall of the end cover form an annular cavity. When heating, pressure is applied to the end cover, and the melt formed by melting the first injection-molded layer 2 and the second injection-molded layer 4 overflows and fills the annular cavity during the pressurization process.

[0083] The material of the first injection molding layer 2 is polystyrene, and the material of the second injection molding layer 4 is acrylonitrile-butadiene-styrene. The material of the first end cap 1 and the second end cap 3 is iron with nickel infiltrated on the surface. The side wall diameter of the first end cap 1 is 16 mm, and the height of the button battery housing formed by the first end cap 1 and the second end cap 3 is 6 mm. The thickness of the first injection molding layer and the second injection molding layer is independently 1 mm, and the thickness of the first end cap and the second end cap is independently 0.2 mm.

[0084] Example 5

[0085] This embodiment provides a button-type battery housing, wherein the button-type battery housing is as follows: Figure 5 As shown, it includes two end covers that are interlocked, respectively denoted as a first end cover 1 and a second end cover 3 , and the side wall size of the first end cover 1 is larger than the side wall size of the second end cover 3 .

[0086] The first end cover 1 has a first injection layer 2 disposed on its inner circumference, and the second end cover 3 has a second injection layer 4 disposed on its outer circumference. The end faces of the first injection layer 2 and the second injection layer 4 are both inclined surfaces. The end face of the first injection layer 2 is lower than the open end face of the first end cover 1, and the end face of the second injection layer 4 is higher than the open end face of the second end cover 3. The open edge of the side wall of the second end cover 3 is a flange structure (such as Figure 5 After the first end cap 1 and the second end cap 3 are buckled together, at least part of the second injection layer 4 extends into the inside of the side wall of the first end cap 1 and contacts the end face of the first injection layer 2 to form a seam, the seam is located inside the side wall of the first end cap 1, the outer peripheral wall of the second end face 3 and the outer peripheral wall of the first end cap 1 are located on the same annular surface, and the seam is heated outside the end caps so that the two end caps are sealed to form a receiving cavity for accommodating the battery cell.

[0087] An annular notch is provided at the outer edge of the end of the second injection-molded layer 4, and the annular notch and the side wall of the end cover form an annular cavity. When heating, pressure is applied to the end cover, and the melt formed by melting the first injection-molded layer 2 and the second injection-molded layer 4 overflows and fills the annular cavity during the pressurization process.

[0088] The first injection layer 2 and the second injection layer 4 are both made of polyethylene. The first end cap 1 and the second end cap 3 are made of stainless steel. The side wall diameter of the first end cap 1 is 12 mm, and the height of the button battery housing formed by the first end cap 1 and the second end cap 3 is 5.4 mm. The thickness of the first injection layer and the second injection layer is independently 0.4 mm, and the thickness of the first end cap and the second end cap is independently 0.12 mm.

[0089] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A button battery housing, characterized in that: The button battery housing includes two end covers that are buckled with each other, which are respectively recorded as a first end cover and a second end cover, wherein a first injection-molded layer is provided on the inner circumference of the side wall of the first end cover, and a second injection-molded layer is provided on the inner circumference of the side wall of the second end cover; an end surface of the first injection-molded layer is lower than an open end surface of the first end cover, and an end surface of the second injection-molded layer is higher than an open end surface of the second end cover; After the first end cap and the second end cap are buckled together, at least a portion of the second injection-molded layer extends into the inside of the side wall of the first end cap and contacts the end surface of the first injection-molded layer to form a seam, and the seam is located inside the side wall of the first end cap; The seam outside the end cover is heated to seal the two end covers to form a receiving cavity for accommodating the battery cell; An annular notch is provided at the outer edge of the end of the second injection layer and / or the first injection layer. The annular notch and the side wall of the end cover form an annular cavity for accommodating overflowed glue after heating and melting.

2. The button battery housing according to claim 1, characterized in that: The side wall size of the first end cover is larger than the side wall size of the second end cover.

3. The button battery housing according to claim 1, characterized in that: The end surface of the first injection-molded layer and the end surface of the second injection-molded layer are both inclined surfaces.

4. The button battery housing according to claim 1, characterized in that: The first injection layer and the second injection layer are made of thermoplastic material.

5. The button battery housing according to claim 1, characterized in that: The materials of the first injection molding layer and the second injection molding layer are independently selected from polyethylene, polyvinyl chloride, polypropylene, polystyrene or acrylonitrile-butadiene-styrene.

6. The button battery housing according to claim 1, characterized in that: The side wall diameter of the first end cover is 8-16 mm.

7. The button battery housing according to claim 1, characterized in that: The height of the button-type battery housing formed by buckling the first end cover and the second end cover is 3-6 mm.

8. The button battery housing according to claim 1, characterized in that: The thickness of the first injection-molded layer and the second injection-molded layer are independently 0.2 to 1 mm.

9. The button battery housing according to claim 1, characterized in that: The thickness of the first end cover and the second end cover are independently 0.1 to 0.2 mm.

10. A button battery, characterized in that: The button battery comprises the button battery housing according to any one of claims 1 to 9 and a battery cell located inside the button battery housing.

11. The button battery according to claim 10, characterized in that: The battery cell is a wound battery cell or a stacked battery cell.

12. The button cell according to claim 10, characterized in that: The battery core is a wound battery core, and the winding center axis of the battery core is perpendicular to the first end cover and the second end cover.

13. The button cell according to claim 10, characterized in that: The battery cell is a stacked battery cell, and the stacking surface of the battery cell is parallel to the first end cover and the second end cover.

14. A method for assembling a button cell as claimed in any one of claims 10 to 13, characterized in that: The assembly method comprises: Place the battery cell into one of the end covers, buckle the other end cover, heat the joint between the first injection molded layer and the second injection molded layer on the outside of the end cover, melt the first injection molded layer and the second injection molded layer and then cool them to achieve heat sealing between the two end covers; apply pressure to the end cover while heating, and the melt formed after the first injection molded layer and the second injection molded layer are melted overflows during the pressurization process and fills the annular gap.

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