Packaging structure for button cell

Abstract

The utility model belongs to the technical field of battery packaging, and relates to a packaging structure for a button battery, which comprises a packaging body and a pole assembled with the packaging body in an insulating manner, the packaging body comprises a first packaging body and a second packaging body welded with the first packaging body, a built-in cavity is enclosed by the first packaging body and the second packaging body, and the first packaging body and the second packaging body are arranged in the built-in cavity. An insulator is connected between the second packaging body and the pole; in the thickness direction of the insulator, one surface of the second packaging body and one surface of the pole are respectively connected with two surfaces of the insulator, and the other surface of the second packaging body is arranged as a cavity wall of the built-in cavity; through the design of the invention, the insulator is arranged above the first packaging body, so that not only is the sealing performance of the battery improved, but also more energy storage space is reserved, and the battery core with the same volume can store more energy.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery packaging, and particularly relates to a packaging structure for a button battery. Background Art

[0002] With the strong growth of the wearable device market, the demand for micro-batteries (such as steel shell button batteries) is increasing day by day. In large battery pack devices or equipment, in order to improve the shell strength, space utilization efficiency, energy density and power density, most manufacturers are committed to using button battery shells to solve the above technical problems.

[0003] However, the existing button battery shell design, as Figure 1 shown, places the insulator 2' at the bottom of the package 100', and bonds the package 100' and the terminal post 3' together through the insulator 2'. At the same time, in order to achieve stability, the prior art often adds another layer of reinforcement plate 4' under the above-mentioned insulator 1'. Although this method can solve the problems of poor heat dissipation performance and low strength of the shell in the prior art, it does not fully consider that during the packaging process of the battery package 100', the insulator 2' and the reinforcement plate 4' placed under the package 100' limit the accommodation space for the battery tab, thus affecting the cell capacity. In addition, connecting the terminal post 3' and the package 100' through the insulator 2' will cause voids, and then lead to the situation of water accumulation, dust accumulation and conduction electrolysis inside the battery.

[0004] Based on this, there is an urgent need for an optimized solution for the packaging structure of a button battery to solve the above-mentioned technical problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a packaging structure for a button battery in view of the deficiencies of the prior art, so as to solve the influence of the existing button battery shell on the battery capacity and airtightness.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A packaging structure for a button battery, comprising a package and a terminal post insulated and assembled with the package. The package includes a first package and a second package welded to the first package. An insulator is connected between the second package and the terminal post. In the thickness direction of the insulator, one side of the second package and one side of the terminal post are respectively connected to two sides of the insulator, and an inner cavity is surrounded by the other side of the second package and the first package.

[0008] Compared with the prior art, the utility model has at least the following beneficial effects:

[0009] 1. An insulator is connected between the second encapsulation body and the terminal post of the present utility model. In the thickness direction of the insulator, one side of the second encapsulation body and one side of the terminal post are respectively connected to two sides of the insulator. By this technical means, it is avoided that the insulator is not placed in an internal cavity of the same volume, saving the volume energy density of the encapsulation body.

[0010] 2. The second encapsulation body and the terminal post of the present utility model are respectively connected to two sides of the insulator, so that there is no gap between the second encapsulation body and the terminal post, effectively preventing the situation of water accumulation, dust accumulation and conduction electrolysis inside the battery, and improving the safety and stability of the battery.

[0011] 3. The other side of the second encapsulation body of the present utility model is set as the cavity wall of the internal cavity, so that this side of the second encapsulation body is not connected to any component, solving the problem of insufficient space utilization caused by the connection between the second encapsulation body and other components in the prior art, and improving the volume energy density in the internal cavity.

[0012] As an improvement to the encapsulation structure for a button cell of the present utility model, the insulator includes a first insulator and a second insulator connected to the first insulator. The terminal post includes a first cylinder and a second cylinder integrally connected to the first cylinder. One side of the second encapsulation body and one side of the first cylinder are respectively connected to two sides in the thickness direction of the first insulator, and the second cylinder is hermetically connected to the second insulator.

[0013] As an improvement to the encapsulation structure for a button cell of the present utility model, the first insulator is vertically connected to the second insulator, and the second insulator is connected to the second encapsulation body.

[0014] As an improvement to the encapsulation structure for a button cell of the present utility model, a through hole is formed in the center of the second insulator, and the second cylinder is placed in the through hole and is in interference fit with the second insulator.

[0015] As an improvement to the encapsulation structure for a button cell of the present utility model, the second cylinder includes a cylinder connected to the first cylinder, and a first convex part and a second convex part symmetrically and oppositely extending along the thickness direction of the first cylinder. Both the first convex part and the second convex part are perpendicular to the first cylinder, and the second convex part is placed in the through hole and is in interference fit with the second insulator.

[0016] As an improvement to the encapsulation structure for a button cell of the present utility model, the side of the second convex part, the second insulator and the second encapsulation body facing the internal cavity are all located on the same plane.

[0017] As an improvement to the encapsulation structure for a button cell of the present utility model, it further includes an adapter body and an adhesive. The adapter body is electrically connected to the first cylinder, the adhesive covers the adapter body, and the thickness of the adapter body is A 1 , and the thickness of the adhesive is A 2, the height of the first convex part is H, and they satisfy the relationship: A 1 +A 2 ≤H.

[0018] As an improvement to the packaging structure for the button cell of the present utility model, the end of the first package body has a first connection section, the end of the second package body has a second connection section matching the first connection section, and the first connection section and the second connection section are welded.

[0019] As an improvement to the packaging structure for the button cell of the present utility model, the first connection section and the second connection are coaxially arranged along the axis direction of the battery core to be packaged.

[0020] As an improvement to the packaging structure for the button cell of the present utility model, the thickness of the first connection section is D 1 , the thickness of the second connection section is D 2 , the thickness of the first package body is D, and they satisfy the relationship: D 1 +D 2 ≤D. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present utility model, and constitute a part of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0022] Figure 1 is a schematic structural diagram of a button cell structure in the prior art;

[0023] Figure 2 is a schematic structural diagram of Embodiment 1 in the present utility model;

[0024] Figure 3 is a schematic structural diagram of Embodiment 2 in the present utility model;

[0025] Figure 4 is one of the partial structural diagrams of Embodiment 2 in the present utility model;

[0026] Figure 5 is another partial structural diagram of Embodiment 2 in the present utility model;

[0027] Figure 6 is a schematic structural diagram of Embodiment 3 in the present utility model;

[0028] Figure 7 is a schematic structural diagram of the assembly of the adapter, the adhesive body and the first column in Embodiment 4 of the present utility model;

[0029] Figure 8Schematic diagram of the assembly of the first encapsulation body and the second encapsulation body in Embodiment 5 of the present utility model;

[0030] Figure 9 Schematic diagram of the assembly of the first encapsulation body and the second encapsulation body in Embodiment 5 of the present utility model (showing the parallel relationship between the first connection segment and the second connection segment).

[0031] Figure 10 Schematic diagram of Embodiment 6 of the present utility model.

[0032] Wherein: 100' - encapsulation body;

[0033] 2' - insulator;

[0034] 3' - terminal post;

[0035] 4' - reinforcing plate;

[0036] 100 - encapsulation body;

[0037] 1 - first encapsulation body;

[0038] 11 - built-in cavity;

[0039] 12 - first connection segment; 2 - second encapsulation body;

[0040] 21 - second connection segment; 3 - terminal post;

[0041] 31 - first column;

[0042] 32 - second column;

[0043] 321 - column;

[0044] 322 - first convex portion;

[0045] 323 - second convex portion;

[0046] 33 - conductive coating; 4 - insulator;

[0047] 41 - first insulator;

[0048] 42 - second insulator;

[0049] 421 - through hole; 5 - adapter;

[0050] 6 - adhesive;

[0051] A 1 - Thickness of the adapter;

[0052] A 2 -Thickness of the adhesive;

[0053] H - Height of the first convex portion.

[0054] D 1 - Thickness of the first connecting section; D 2 - Thickness of the second connecting section; D - Thickness of the first package body. Detailed implementation manners

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the description of the present application in this specification are only for the purpose of describing specific embodiments, and are not intended to limit the present application.

[0056] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0057] Although the present application is disclosed above in a preferred embodiment, it is not used to limit the claims. Any person skilled in the art can make several possible changes and modifications without departing from the concept of the present application. Therefore, the scope of protection of the present application should be determined by the scope defined by the claims of the present application.

[0058] In order to overcome the deficiencies of the existing button battery housing structure, the present application proposes an improved battery housing design. This new design ensures the safety and sealing of the battery, while not sacrificing valuable storage space. The following will further describe the present utility model in detail in combination with specific implementation manners, but the implementation manners of the present utility model are not limited thereto.

[0059] Embodiment 1

[0060] As Figure 2A disclosed button cell packaging structure aims to solve the problem that the internal space of the button cell housing is occupied in the prior art. The button cell packaging structure includes a packaging body 100 and a pole column 3 that is insulated and assembled with the packaging body 100. The packaging body 100 includes a first packaging body 1 and a second packaging body 2 welded to the first packaging body 1. An internal cavity 11 is defined by the first packaging body 1 and the second packaging body 2. An insulator 4 is connected between the second packaging body 2 and the pole column 3. In the thickness direction of the insulator 4, one side of the second packaging body 2 and one side of the pole column 3 are respectively connected to two sides of the insulator 4, and the other side of the second packaging body 2 is set as the wall of the internal cavity 11.

[0061] Among them, the first packaging body 1 and the second packaging body 2 are formed into an integral body by welding. This design not only improves the stability of the battery but also helps to prevent the battery from loosening or being damaged during long-term use. The pole column 3 that is insulated and assembled with the packaging body 100 functions to conduct current and connect external devices. Between the second packaging body 2 and the pole column 3, a layer of insulator 4 is designed, which can effectively prevent current leakage and improve the safety performance of the battery. At the same time, the first packaging body 1 and the second packaging body 2 define an internal cavity 11, further enhancing the stability and safety of the battery.

[0062] In addition, the designed internal cavity 11 of this application can fully explore and utilize the space between the first packaging body 1 and the second packaging body 2. As Figure 2 shown, the volume of the internal cavity 11 is jointly defined by the first packaging body 1 and the second packaging body 2. This design not only ensures the close cooperation between various components inside the battery but also maximizes the space advantage, thereby improving the energy density of the battery. It should be noted that the existence of the internal cavity 11 enables the battery to have a stronger resistance when facing external impacts or damages. This design not only helps to extend the service life of the battery but also reduces the risks during the actual application process of the battery.

[0063] Preferably, the insulator 4 is made of a thermoplastic polymer material. Specifically, the thermoplastic polymer material can be any one of polypropylene (PP), polycarbonate (PC), polyamide (PA), and polymethyl methacrylate. When polypropylene (PP) is used as the insulator 4, due to its good thermal stability and electrical insulation properties, it can ensure that the battery still maintains a stable working state in high or low temperature environments; when polycarbonate (PC) is used as the insulator 4, polycarbonate (PC) provides additional protection for the battery with its high strength and high transparency, and at the same time allows users to clearly see the state inside the battery; when polyamide (PA) is used as the insulator 4, polyamide (PA) enables the battery to maintain its integrity in the face of various harsh environments due to its excellent wear resistance and chemical corrosion resistance. And polymethyl methacrylate (PMMA) makes the manufacturing of the insulator 4 more convenient due to its high light transmittance and processing performance, while ensuring the aesthetics of the battery.

[0064] Preferably, the second encapsulation body 2 is a ring made of stainless steel. This stainless steel ring has excellent corrosion resistance and strength, can effectively protect the core components inside the battery, and prevent the invasion of the external environment. At the same time, the stainless steel ring also has good electrical conductivity, which can ensure the stable transmission of current during the operation of the battery. In addition, its unique ring design can better adapt to the shape of the battery, making the encapsulation more compact and improving the overall stability of the battery.

[0065] Embodiment 2

[0066] As Figures 3 - 5 shown, different from Embodiment 1: In order to further improve the safety and sealing performance of the battery, the insulator 4 is divided into a first insulator 41 and a second insulator 42 connected to the first insulator 41, the pole column 3 is divided into a first column body 31 and a second column body 32 connected to the first column body 31 as a whole, one side of the second encapsulation body 2 and one side of the first column body 31 are respectively connected to the two sides in the thickness direction of the first insulator 41, and the second column body 32 is hermetically connected to the second insulator 42.

[0067] Among them, the design of the first insulator 41 and the second insulator 42 further enhances the safety and sealing performance of the battery. The first insulator 41 is located between the second encapsulation body 2 and the first column body 31, which can effectively prevent current leakage and improve the safety performance of the battery. The second insulator 42 is hermetically connected to the second column body 32 to ensure the stability and sealing performance inside the battery, and prevent leakage or damage of the battery during use.

[0068] In addition, the terminal post 3 is divided into a first cylinder 31 and a second cylinder 32 connected to the first cylinder 31 as a whole. This design not only enhances the structural strength of the terminal post 3, but also makes the connection between the terminal post 3 and the encapsulation body 100 more stable and reliable. The first cylinder 31 is connected to one side of the second encapsulation body 2, and the second cylinder 32 is hermetically connected to the second insulator 42, forming a double protection and sealing. Even if the battery is subjected to external pressure or vibration during use, it can effectively prevent the leakage of liquid or gas inside the battery, thus ensuring the stability and safety of the battery.

[0069] Furthermore, in order to further improve the structural strength and sealing performance of the battery, a reinforcing rib can also be provided at the connection between the first encapsulation body 1 and the second encapsulation body 2. The reinforcing rib can effectively improve the structural strength of the battery housing and prevent the battery from deforming or cracking during use. At the same time, the design of the reinforcing rib can also effectively prevent external liquid or gas from entering the battery interior, thus ensuring the safety and sealing performance of the battery.

[0070] Furthermore, as Figure 3 shown, the first insulator 41 is vertically connected to the second insulator 42, and the second insulator 42 is connected to the second encapsulation body 2. This vertically connected design method forms a stable support structure between the first insulator 41 and the second insulator 42, enhancing the overall stability and structural strength of the battery. At the same time, since the connection between the first insulator 41 and the second insulator 42 is tighter, it also further improves the sealing performance of the battery and prevents the leakage of liquid or gas inside the battery.

[0071] In addition to the above-mentioned structural features, the battery can also further improve the sealing performance of the battery by adding sealing materials such as gaskets or sealants at the connection between the terminal post 3 and the encapsulation body 100. These sealing materials can effectively fill the tiny gaps between the terminal post 3 and the encapsulation body 100, preventing external liquid or gas from entering the battery interior through these gaps, thus ensuring the safety and stability of the battery.

[0072] Preferably, as Figure 4 shown, a through hole 421 is formed in the center of the second insulator 42, and the second cylinder 32 is placed inside the through hole 421 and is in interference fit with the second insulator 42 as shown in Figure 3 . Among them, the interference fit design can enhance the structural strength between the second cylinder 32 and the second insulator 42, improving the overall stability and safety of the battery. In addition, the design of the through hole 421 can also effectively reduce the volume and weight of the second insulator 42, thus reducing the overall cost of the battery. Furthermore, the through hole 421 can also improve the heat dissipation performance of the second cylinder 32, enabling the heat generated during the operation of the battery to be dissipated in time and preventing the battery from experiencing thermal runaway.

[0073] Preferably, as Figure 5 shown, the second cylinder 32 includes a cylinder 321 connected to the first cylinder 31, and a first convex portion 322 and a second convex portion 323 that are symmetric and extend in opposite directions along the thickness direction of the first cylinder 31. Both the first convex portion 322 and the second convex portion 323 are perpendicular to the first cylinder 31. The second convex portion 323 is placed inside the through hole 421 and is in interference fit with the second insulator 42.

[0074] This design makes the structure of the second cylinder 32 more stable and the connection with the second insulator 42 closer, thereby improving the sealing and safety of the battery. At the same time, the setting of the first convex portion 322 and the second convex portion 323 can also enhance the structural strength of the second cylinder 32 and prevent the battery from deforming or cracking during use. In addition, the design of the first convex portion 322 and the second convex portion 323 can effectively reduce the volume and weight of the second cylinder 32, further reducing the overall cost of the battery.

[0075] In addition, the battery can also improve the performance and safety of the battery by adding some auxiliary structures inside the package 100, such as partition plates, heat conducting sheets, etc. The partition plate can divide the space inside the battery into multiple independent areas to prevent internal short circuits or explosions in the battery. The heat conducting sheet can effectively conduct the heat generated by the battery during operation to prevent the battery from experiencing thermal runaway.

[0076] In summary, the package structure for the button battery ensures the stability and safety of the battery through multiple protection and sealing measures. At the same time, by using different materials and structural designs, it can also meet different application scenarios and usage requirements.

[0077] Others are the same as those in Embodiment 1 and will not be elaborated here.

[0078] Embodiment 3

[0079] As Figure 6 shown, different from Embodiment 2, in order to further improve the airtightness, the first package 1 has an internal cavity 11, and the second convex portion 323, the second insulator 42, and the side of the second package 2 facing the internal cavity 11 are all located on the same plane.

[0080] This design makes the internal structure of the battery more compact, and at the same time improves the overall stability and safety of the battery. The built-in cavity 11 of the first encapsulation body 1 can effectively accommodate the second convex portion 323, the second insulator 42 and the second encapsulation body 2, making the connection between these components tighter and preventing the battery from loosening or falling off during use. At the same time, since the surfaces of the second convex portion 323, the second insulator 42 and the second encapsulation body 2 facing the built-in cavity 11 are all on the same plane, it further improves the sealing performance of the battery and prevents the leakage of internal liquid or gas of the battery.

[0081] Others are the same as those in Embodiment 2 and will not be elaborated here.

[0082] Embodiment 4

[0083] As Figure 7 shown, different from Embodiment 1, in order to further improve the sealing and safety of the battery: the encapsulation structure further includes an adapter body 5 and an adhesive member 6. The adapter body 5 is electrically connected to the first column 31, and the adhesive member 6 covers the adapter body 5. The thickness of the adapter body 5 is A 1 , and the thickness of the adhesive member 6 is A 2 . The height of the first convex portion 322 is H, and they satisfy the relationship: A 1 +A 2 ≤H.

[0084] Specifically, the adapter body 5 is a nickel strip, and its function in the cell assembly is to connect the pole column 3 of the battery to the external circuit, so as to realize the charge and discharge operation of the battery. The adapter body 5 is made of nickel strip material, which has excellent electrical conductivity and corrosion resistance, ensuring the stability and safety of the battery during use. The adapter body 5 is firmly bonded to the first column 31 through the adhesive member 6 to form a stable electrical connection. The sum of the thickness A 1 of the adapter body 5 and the thickness A 2 of the adhesive member does not exceed the height H of the first convex portion 322. Such a design ensures that the space occupied by the adapter body 5 and the adhesive member 6 inside the battery is minimized, while ensuring that the internal structure of the battery is compact and stable.

[0085] At the same time, since the relationship between the sum of the thicknesses of the adapter body 5 and the adhesive member 6 and the height of the first convex portion 322 is precisely controlled, it prevents the battery from loosening or falling off during use, and further improves the sealing and safety of the battery.

[0086] Others are the same as those in Embodiment 1 and will not be elaborated here.

[0087] Embodiment 5

[0088] As Figure 8 、 9As shown, different from Embodiment 1: In order to further improve the energy storage effect of the button battery housing, the end of the first package 1 has a first connection section 12, and the end of the second package 2 has a second connection section 21 that matches the first connection section 12. The first connection section 12 and the second connection section 21 are welded.

[0089] This design firmly connects the first package 1 and the second package 2 together by welding, further improving the overall stability and safety of the battery. Welding is a reliable and high-strength connection method that can effectively prevent the battery from loosening or falling off during use. At the same time, due to the matching design of the first connection section 12 and the second connection section 21, it also ensures the accuracy and precision of welding, preventing possible deviations or defects during the welding process.

[0090] In addition, this packaging structure can also improve the battery's usage experience and safety by adding some anti-slip or anti-scratch coatings or structures on the surface of the package 100. For example, anti-slip patterns can be set on the outer surface of the package 100 or an anti-scratch coating can be added to prevent the battery from slipping or being scratched during use.

[0091] Furthermore, anti-slip patterns are provided on the outer surfaces of both the first package 1 and the second package 2. This design can increase the friction between the battery and the user's hand, prevent the battery from slipping during use, and improve the safety of battery use. At the same time, the design of the anti-slip patterns can also increase the aesthetics and texture of the battery, enhancing the user's usage experience.

[0092] Furthermore, this packaging structure can also further improve the safety and stability of the battery by adding some temperature monitoring or control components inside the package 100. For example, a temperature sensor can be set inside the package 100 to monitor the working temperature of the battery in real time and take corresponding control measures when the temperature is too high to prevent the battery from experiencing thermal runaway. At the same time, the working temperature of the battery can also be adjusted through the temperature control component to ensure that the battery can work stably in different environments.

[0093] As Figure 8 shown, the first connection section 12 and the second connection section 21 of this embodiment are coaxially arranged along the axis of the battery cell to be packaged, and the cross-sections of the first connection section 12 and the second connection section 21 along the axis of the battery cell are set as rectangular structures. This design method not only makes welding more convenient and accurate, but also enhances the overall structural strength of the battery, preventing the battery from deforming or cracking during use.

[0094] Preferably, as Figure 8As shown, the lengths of the first connection segment 12 and the second connection segment 21 are equal, and the widths of the first connection segment 12 and the second connection segment 21 are equal. This design makes the connection between the first package 1 and the second package 2 more uniform and stable, further improving the overall safety and stability of the battery. At the same time, the design with equal lengths and widths also makes the battery more beautiful and coordinated in appearance, improving the user experience.

[0095] Furthermore, as Figure 9 shown, when the lengths of the first connection segment 12 and the second connection segment 21 are equal, the thickness of the first connection segment 12 is D 1 , and the thickness of the second connection segment 21 is D 2 , and the thickness of the first package 1 is D. They satisfy the relationship: D 1 + D 2 ≤ D. Specifically, the thickness D of the first package 1 is 0.12 - 0.15 mm, the thickness D of the first connection segment 12 1 and the thickness D of the second connection segment 21 2 are both 0.04 ± 0.01 mm. Specifically, when D 1 and D 2 are close to 0.04 mm, the value of D should be as close as possible to its minimum value of 0.12 mm, avoiding the influence of solder on the shell thickness during the welding process. At the same time, the overall thickness of the package 100 is relatively thin, and it can also adapt to some application scenarios with high requirements for the thickness of the package 100.

[0096] When D 1 and D 2 are greater than 0.04 mm, the value of D can be appropriately increased, but still needs to satisfy the condition of D 1 + D 2 ≤ D. This can ensure the structural strength and stability of the package 100, while avoiding affecting its use effect due to excessive thickness.

[0097] Others are the same as in Embodiment 1 and will not be elaborated here.

[0098] Embodiment 6

[0099] As Figure 10 shown, different from Embodiment 1, in order to further improve the service life and performance of the battery, a conductive coating 33 is also provided on the pole 3 in this embodiment. The conductive coating 33 can effectively improve the conductivity of the pole 3, reduce the internal resistance of the battery, thereby improving the charge and discharge efficiency and service life of the battery. At the same time, the design of the conductive coating 33 can also effectively prevent oxidation or corrosion of the pole 3 during use, ensuring the stability and safety of the battery.

[0100] Others are the same as those in Embodiment 1 and will not be elaborated here.

[0101] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A packaging structure for a button cell, comprising a packaging body (100) and a pole (3) insulated and assembled with the packaging body (100), characterized in that: The package (100) comprises a first package (1) and a second package (2) welded to the first package (1), the first package (1) and the second package (2) are provided with a built-in cavity (11), and an insulator (4) is connected between the second package (2) and the pole (3); In the thickness direction of the insulator (4), one side of the second packaging body (2) and one side of the pole (3) are respectively connected to two sides of the insulator (4), and the other side of the second packaging body (2) is arranged as a cavity wall of the built-in cavity (11).

2. The packaging structure for button type battery according to claim 1, characterized in that: The insulator (4) comprises a first insulator (41) and a second insulator (42) connected to the first insulator (41); the pole (3) comprises a first column (31) and a second column (32) connected to the first column (31) as a whole; one side of the second package (2) and one side of the first column (31) are respectively connected to two sides of the first insulator (41) in a thickness direction; and the second column (32) and the second insulator (42) are sealed and connected.

3. The packaging structure for button type battery according to claim 2, characterized in that: The first insulator (41) is vertically connected to the second insulator (42), and the second insulator (42) is connected to the second packaging body (2).

4. The packaging structure for button type battery according to claim 2, characterized in that: A through hole (421) is formed in the center of the second insulator (42), and the second column (32) is placed in the through hole (421) and is interference-fitted with the second insulator (42).

5. The packaging structure for button type battery according to claim 4, characterized in that: The second column (32) comprises a column (321) connected to the first column (31), and a first convex portion (322) and a second convex portion (323) symmetrically extending in opposite directions along the thickness direction of the first column (31), the first convex portion (322) and the second convex portion (323) both being perpendicular to the first column (31), and the second convex portion (323) being disposed in the through hole (421) and being interference-fitted with the second insulator (42).

6. The packaging structure for button type battery according to claim 5, characterized in that: The second convex portion (323), the second insulator (42) and a surface of the second packaging body (2) facing the built-in cavity (11) are all located on the same plane.

7. The packaging structure for button-type batteries according to claim 5, characterized in that: It also includes a transition body (5) and an adhesive (6), wherein the transition body (5) is electrically connected to the first column (31), and the adhesive (6) covers the transition body (5); the thickness of the transition body (5) is A1, the thickness of the adhesive (6) is A2, and the height of the first protrusion (322) is H, which satisfy the relationship: A1+A2≤H.

8. The packaging structure for button type battery according to claim 1, characterized in that: The end of the first encapsulation body (1) has a first connecting section (12), the end of the second encapsulation body (2) has a second connecting section (21) matching the first connecting section (12), and the first connecting section (12) and the second connecting section (21) are welded.

9. The packaging structure for button type battery according to claim 8, characterized in that: The first connecting section (12) and the second connecting section (21) are coaxially arranged along the axis direction of the battery cell to be packaged.

10. The packaging structure for button type battery according to claim 8, characterized in that: The thickness of the first connecting section (12) is D1, the thickness of the second connecting section (21) is D2, and the thickness of the first packaging body (1) is D, and they satisfy the relationship: D1+D2≤D.

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