Button type shell structure and button type battery

Abstract

The utility model relates to the technical field of energy storage equipment, in particular to a button-type shell structure and a button-type cell, the button-type shell structure comprises a first end wall and side walls, the side walls comprise a first side wall, a second side wall and a third side wall which are connected in sequence, the second side wall is provided with an annular step surface, the annular step surface faces one side of the first end wall, and the third side wall faces the other side of the first end wall. One end of the first side wall is circumferentially connected to the edge of the first end wall, the other end of the first side wall is circumferentially connected to the inner ring of the second side wall, one end of the third side wall is circumferentially connected to the outer ring of the second side wall, the other end of the third side wall extends in the direction away from the first end wall, and the included angle A between the second side wall and the third side wall is larger than or equal to 90 degrees and smaller than or equal to 95 degrees. The joint between the second side wall and the third side wall is in curved surface transition to form an annular first bent part, and the curvature radius B of the first bent part is larger than or equal to 0.1 mm and smaller than or equal to 2mm. The button cell comprises a sealing ring, a second shell and the button shell structure.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a button-type housing structure and a button battery. Background Technology

[0002] The existing negative electrode casing structure of the coin cell is as follows: 100' Figure 1 As shown, the negative electrode housing structure 100' has a flange 1', which is perpendicular to the end face 2' of the negative electrode housing structure 100'. The flange 1' and the side wall 3' cannot be completely fitted together, resulting in a gap. This button cell has the following problems:

[0003] 1. Because there is a gap between the flange 1' and the side wall 3', the internal space of the button cell is reduced, resulting in a low capacity of the button cell.

[0004] 2. Since the flange 1' of the negative electrode shell structure 100' is perpendicular to the end face 2' of the negative electrode shell structure 100', the button cell will be subjected to a lateral compressive force when it is sealed. The side wall 3' of the negative electrode shell structure 100' will be concave inward due to the force, resulting in a reduction in the sealing performance of the button cell.

[0005] 3. Since the sharp edge of the flange 1' faces the end face 2' of the negative electrode shell structure 100', and this sharp edge is generated when the material is cut, the sealing ring at the shoulder of the button battery will be significantly squeezed, deformed or even broken by the sharp edge, resulting in poor leakage prevention performance of the button battery. Utility Model Content

[0006] One objective of this invention is to provide a button cell housing structure that helps to increase the internal space of the button cell battery, increase the capacity of the button cell battery, and help prevent electrolyte leakage and ensure the sealing performance of the button cell battery.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A snap-fit ​​housing structure is provided, including a first end wall and a side wall. The side wall includes a first side wall, a second side wall, and a third side wall connected in sequence. The second side wall has an annular stepped surface facing the first end wall. One end of the first side wall is circumferentially connected to the edge of the first end wall, and the other end is circumferentially connected to the inner circle of the second side wall. One end of the third side wall is circumferentially connected to the outer circle of the second side wall, and the other end extends in a direction away from the first end wall. The included angle A between the second side wall and the third side wall satisfies 90°≤A≤95°. The connection between the second side wall and the third side wall has a curved transition to form an annular first curved portion. The radius of curvature B of the first curved portion satisfies 0.1mm≤B≤2mm.

[0009] Optionally, the included angle C between the first end wall and the first side wall satisfies 90°≤C≤98°.

[0010] Optionally, the connection between the first end wall and the first side wall is curved to form a second annular bend, the radius of curvature D of the second bend satisfying 0.1mm≤D≤2mm.

[0011] Optionally, the included angle E between the first sidewall and the second sidewall satisfies 90°≤E≤95°.

[0012] Optionally, the connection between the first sidewall and the second sidewall is curved to form an annular third bend, wherein the radius of curvature F of the third bend satisfies 0.05mm≤F≤1mm.

[0013] Optionally, the first end wall and the first side wall are curved to form a second annular bend. The projection of the highest curvature of the second bend toward the plane where the first end wall is located is the first ring, and the projection of the highest curvature of the first bend toward the plane where the first end wall is located is the second ring. The shortest distance G between the first ring and the second ring satisfies 0.3mm≤G≤1.5mm.

[0014] And / or, the first end wall and the first side wall are curved to form an annular second bend, the projection of the highest curvature of the second bend toward the axis of the first end wall is the first point, the projection of the highest curvature of the first bend toward the axis of the first end wall is the second point, and the distance H between the first point and the second point satisfies 0.35mm≤H≤1.3mm;

[0015] And / or, the projection of the highest curvature of the first curved portion toward the axis of the first end wall is the second point, and the projection of the edge of the third side wall away from the second side wall toward the axis of the first end wall is the third point, and the distance I between the second point and the third point satisfies 0.3mm≤I≤1.88mm.

[0016] Another objective of this invention is to provide a button cell battery that can help increase the internal space of the button cell battery, increase the capacity of the button cell battery, and help prevent electrolyte leakage and ensure the sealing performance of the button cell battery.

[0017] To achieve this objective, the present invention adopts the following technical solution:

[0018] A button cell battery is provided, including a sealing ring, a second housing, and the aforementioned button cell structure. Both the button cell structure and the second housing are box-shaped structures with openings. The button cell structure is inserted into the second housing, and the opening direction of the second housing is opposite to the opening direction of the button cell structure. The sealing ring is used to circumferentially seal the gap between the side wall and the fourth side wall of the second housing.

[0019] Optionally, the sealing ring covers the third sidewall, the first bend, and a portion of the second sidewall.

[0020] Optionally, the opening edge of the second housing is bent inward to form a fourth curved portion, and the radius of curvature K of the fourth curved portion satisfies 0.8mm≤K≤1.2mm;

[0021] And / or, the sealing ring portion is sandwiched between the fourth bend and the third bend, and the ratio X1 of the shortest distance J1 between the fourth bend and the third bend to the thickness T of the second housing satisfies 80% ≤ X1 ≤ 120%;

[0022] And / or, the sealing ring portion is located between the inner wall of the fourth sidewall and the outer wall of the third sidewall, and the ratio X2 of the shortest distance J2 between the inner wall of the fourth sidewall and the outer wall of the third sidewall to the thickness T of the second housing satisfies 60% ≤ X2 ≤ 200%;

[0023] And / or, the sealing ring is partially sandwiched between the end of the third sidewall and the inner wall of the second end wall of the second housing, and the ratio X3 of the shortest distance J3 between the end of the third sidewall and the inner wall of the second end wall to the thickness T of the second housing satisfies 340% ≤ X3 ≤ 560%.

[0024] Optionally, along the axial direction of the button cell structure, the ratio L of the maximum height of the sealing ring to the overall height of the button cell battery satisfies 70% ≤ L ≤ 85%.

[0025] The beneficial effects of this utility model are:

[0026] This invention provides a snap-on housing structure, including a first end wall and a side wall. The side wall comprises a first side wall, a second side wall, and a third side wall connected sequentially. The second side wall has an annular stepped surface facing the first end wall. One end of the first side wall is circumferentially connected to the edge of the first end wall, and the other end is circumferentially connected to the inner ring of the second side wall. One end of the third side wall is circumferentially connected to the outer ring of the second side wall, and the other end extends away from the first end wall. The included angle A between the second and third side walls satisfies 90°≤A≤95°. The connection between the second and third side walls is a curved transition to form an annular first curved portion. The radius of curvature B of the first curved portion satisfies 0.1mm≤B≤2mm. This snap-on housing structure eliminates the flange structure. On the one hand, the side wall is only one layer, and on the other hand, there is no gap between the side wall and the flange. This space becomes the internal space of the battery. Therefore, this snap-on housing structure can effectively increase the internal space of the battery and improve the capacity of the snap-on battery. Furthermore, during the sealing of the button cell battery, the compressive force is primarily applied to the first bend. Since the first bend is approximately a right angle with a radius of curvature B not exceeding 2mm, the compressive force is effectively dispersed. The high structural strength of the first bend prevents bending deformation, thus preventing gaps between the battery and the sealing ring caused by deformation, which could lead to leakage. Moreover, this button cell housing structure also prevents sharp edges from damaging the sealing ring and causing leakage. Therefore, this button cell housing structure helps prevent electrolyte leakage and ensures the sealing performance of the button cell battery.

[0027] This utility model also provides a button cell battery, including a sealing ring, a second housing, and the aforementioned button cell structure. Both the button cell structure and the second housing are box-shaped structures with openings. The button cell structure is inserted into the second housing, and the opening direction of the second housing is opposite to the opening direction of the button cell structure. The sealing ring is used to circumferentially seal the gap between the side wall of the button cell structure and the fourth side wall of the second housing. This button cell battery can help increase the internal space of the button cell battery, increase the capacity of the button cell battery, and help prevent electrolyte leakage, ensuring the sealing performance of the button cell battery. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of a snap-fit ​​shell structure in the prior art;

[0029] Figure 2 This is a schematic diagram of the structure of the button battery provided in this embodiment of the utility model;

[0030] Figure 3 This is a cross-sectional view of the snap-fit ​​housing structure provided in this embodiment of the present invention;

[0031] Figure 4 This is a partial cross-sectional view of the snap-fit ​​housing structure provided in this embodiment of the present invention;

[0032] Figure 5 This is a cross-sectional view of the button battery provided in this embodiment of the utility model;

[0033] Figure 6 This is a partial structural cross-sectional view of a button cell, as shown in Scale 1.

[0034] Figure 1 and Figure 6 middle:

[0035] 100', Negative electrode shell structure; 1', Flanged edge; 2', End face; 3', Side wall;

[0036] Figures 2-5 middle:

[0037] 1. First end wall; 2. First side wall; 3. Second side wall; 31. Annular stepped surface; 4. Third side wall; 5. First bend; 6. Second bend; 7. Third bend;

[0038] 100. Snap-on housing structure; 200. Sealing ring; 300. Second housing; 301. Fourth bend. Detailed Implementation

[0039] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0040] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0041] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0042] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0043] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0044] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0045] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0046] like Figure 1As shown, the existing button cell battery's negative electrode casing structure 100' has a flange 1', which is perpendicular to the end face 2' of the negative electrode casing structure 100'. Furthermore, the flange 1' cannot be completely fitted with the side wall 3', resulting in a gap. This button cell battery has the following problems:

[0047] 1. Because there is a gap between the flange 1' and the side wall 3', the internal space of the button cell is reduced, resulting in a low capacity of the button cell.

[0048] 2. Since the flange 1' of the negative electrode shell structure 100' is perpendicular to the end face 2' of the negative electrode shell structure 100', the button cell will be subjected to a lateral compressive force when it is sealed. The side wall 3' of the negative electrode shell structure 100' will be concave inward due to the force, resulting in a reduction in the sealing performance of the button cell.

[0049] 3. Since the sharp edge of the flange 1' faces the end face 2' of the negative electrode shell structure 100', and this sharp edge is generated when the material is cut, the sealing ring at the shoulder of the button battery will be significantly squeezed, deformed or even broken by the sharp edge, resulting in poor leakage prevention performance of the button battery.

[0050] To address the aforementioned problems, this embodiment provides a snap-fit ​​housing structure 100. For example... Figures 2-5 As shown, the snap-fit ​​shell structure 100 of this embodiment includes a first end wall 1 and a side wall. The side wall includes a first side wall 2, a second side wall 3 and a third side wall 4 connected in sequence. The second side wall 3 has an annular stepped surface 31 facing the side of the first end wall 1. One end of the first side wall 2 is circumferentially connected to the edge of the first end wall 1, and the other end is circumferentially connected to the inner circle of the second side wall 3. One end of the third side wall 4 is circumferentially connected to the outer circle of the second side wall 3, and the other end extends in a direction away from the first end wall 1. The included angle A between the second side wall 3 and the third side wall 4 satisfies 90°≤A≤95°. The connection between the second side wall 3 and the third side wall 4 is curved to form an annular first curved portion 5. The radius of curvature B of the first curved portion 5 satisfies 0.1mm≤B≤2mm.

[0051] The button cell housing structure 100 eliminates the flange structure. On one hand, the sidewall is only one layer; on the other hand, there is no gap between the sidewall and the flange. This space becomes the internal space of the battery, effectively increasing the internal space and capacity of the button cell. Furthermore, during sealing, the pressure is concentrated at the first bend 5. Because the first bend 5 is approximately a right angle with a radius of curvature B not exceeding 2mm, the pressure is effectively dispersed. The high structural strength of the first bend 5 prevents bending deformation, thus preventing gaps between the bend and the sealing ring 200 and potential leakage. Moreover, the button cell housing structure 100 avoids damage to the sealing ring 200 from the sharp edges of the flange, preventing leakage. Therefore, the button cell housing structure 100 helps prevent electrolyte leakage and ensures the sealing performance of the button cell. A radius of curvature B of not less than 0.1mm ensures the structural strength of the first bend 5 and prevents cracking. Furthermore, the radius of curvature B of the first curved portion 5 conforms to 0.1mm≤B≤2mm, which can also ensure that the opening edge of the snap-on housing structure 100, that is, the edge of the third side wall 4 away from the second side wall 3, can be tightly fitted with the sealing ring 200 or the sealant, so as to ensure the sealing effect.

[0052] Optionally, the included angle C between the first end wall 1 and the first side wall 2 satisfies 90°≤C≤98°. When the button-type housing structure 100 and the sealing ring 200 are injection molded, the button-type housing structure 100 needs to be placed in the injection mold first. The range of the included angle C ensures that it matches the injection mold, guaranteeing precise positioning of the button-type housing structure 100 within the mold. This ensures the dimensional accuracy of the sealing ring 200, reduces dimensional deviations caused by misalignment between the button-type housing structure 100 and the injection mold, and prevents misalignment of the sealing ring 200 in the packaged battery cell. This helps ensure a larger contact area between the positive electrode of the battery cell and the positive electrode housing, resulting in better performance. It also effectively suppresses electrolyte evaporation, prevents external moisture intrusion, and ensures the sealing performance of the button battery. Furthermore, precise positioning reduces wear and deformation of the injection mold during production, maintaining the consistency and aesthetics of the product's appearance.

[0053] Optionally, the connection between the first end wall 1 and the first side wall 2 is curved to form an annular second curved portion 6, and the radius of curvature D of the second curved portion 6 satisfies 0.1mm≤D≤2mm. Similarly, if the radius of curvature D is too large, it will affect the structural strength at this point, and if it is too small, it may cause cracking at this point.

[0054] Optionally, the included angle E between the first sidewall 2 and the second sidewall 3 satisfies 90°≤E≤95°.

[0055] Optionally, the connection between the first sidewall 2 and the second sidewall 3 is curved to form an annular third bend 7, and the radius of curvature F of the third bend 7 satisfies 0.05mm≤F≤1mm. When the radius of curvature F of the third bend 7 meets the above-mentioned range, when the snap-fit ​​shell structure 100 is subjected to lateral extrusion force during the sealing process, the force will be evenly distributed to various parts of the structure, reducing the local stress level, improving the overall stability of the structure, and reducing problems such as material aging and cracking caused by stress concentration, thereby further improving the durability of the structure.

[0056] Optionally, the first end wall 1 and the first side wall 2 form a curved transition to create a ring-shaped second curved portion 6. The projection of the highest curvature of the second curved portion 6 onto the plane containing the first end wall 1 constitutes the first ring, and the projection of the highest curvature of the first curved portion 5 onto the plane containing the first end wall 1 constitutes the second ring. The shortest distance G between the first ring and the second ring satisfies 0.3mm ≤ G ≤ 1.5mm. A more optimized value for the aforementioned shortest distance G can ensure a larger internal cavity space for the button cell, simplify the mold structure, reduce the difficulty of mold manufacturing and debugging, help shorten the mold development and production cycle, and improve the efficiency of stamping production.

[0057] Optionally, the first end wall 1 and the first side wall 2 are curved to form an annular second curved portion 6. The projection of the highest curvature of the second curved portion 6 onto the axis of the first end wall 1 is designated as the first point, and the projection of the highest curvature of the first curved portion 5 onto the axis of the first end wall 1 is designated as the second point. The distance H between the first point and the second point satisfies 0.35mm ≤ H ≤ 1.3mm. Similarly, a more optimal value for the distance H can ensure a larger internal cavity space for the button cell, simplify the mold structure, reduce the difficulty of mold manufacturing and debugging, help shorten the mold development and production cycle, and improve the efficiency of stamping production.

[0058] Optionally, the projection of the highest curvature point of the first curved portion 5 onto the axis of the first end wall 1 is designated as the second point, and the projection of the edge of the third side wall 4 away from the second side wall 3 onto the axis of the first end wall 1 is designated as the third point. The distance I between the second and third points satisfies 0.3mm ≤ I ≤ 1.88mm. It is known that the relationship between the values ​​of distance H and distance I must ensure that the first curved portion 5 is close to the force-bearing position of the seal, so that the opening edge of the second housing 300 does not need to be excessively curved.

[0059] like Figure 2 and Figure 5As shown, this embodiment also provides a button cell battery, including a sealing ring 200, a second housing 300, and the aforementioned button cell structure 100. Both the button cell structure 100 and the second housing 300 are box-shaped structures with openings. The button cell structure 100 is inserted into the second housing 300, and the opening direction of the second housing 300 is opposite to the opening direction of the button cell structure 100. The sealing ring 200 is used to circumferentially seal the gap between the side wall of the button cell structure 100 and the fourth side wall of the second housing 300.

[0060] Optionally, the sealing ring 200 covers the third sidewall 4 and part of the second sidewall 3, that is, the sealing ring 200 covers the first curved portion 5 between the second sidewall 3 and the third sidewall 4. When the second housing 300 of the button battery is subjected to force, most of the force can be transmitted to the first curved portion 5, which can prevent the second sidewall 3 or the third sidewall 4 from bending and deforming under force, thus ensuring the sealing performance.

[0061] The manufacturing process of this coin cell battery includes: first, using injection molding to create a sealing ring 200 on a coin cell housing structure 100; and then using an integral stamping process to create a second housing 300. The negative electrode is placed inside the coin cell housing structure 100 with the sealing ring 200, followed by the placement of the separator, positive electrode collar, and rubber ring. Electrolyte is then injected, and the steel second housing 300 is placed over the coin cell housing structure 100, with the sealing ring 200 positioned inside the second housing 300. Finally, the coin cell is sealed to form the coin cell battery. After assembly, the coin cell battery undergoes a pre-discharge aging process.

[0062] Optionally, the sealing ring 200 is made of one of polypropylene PP8830, polypropylene DX-23, DX-231, and polytetrafluoroethylene. The snap-fit ​​housing structure 100 serves as the negative electrode, and the snap-fit ​​housing structure 100 is made of one of SUS403, SUS304, SUS403L, and SUS316.

[0063] Optionally, the sealing ring 200 covers the third sidewall 4, the first curved portion 5, and part of the second sidewall 3. The sealing ring 200 can both provide insulation between the third sidewall 4 and the fourth sidewall and seal the gap thereon, ensuring the sealing performance of the button cell battery.

[0064] like Figure 5 As shown, optionally, the opening edge of the second housing 300 is bent inward to form a fourth curved portion 301. Optionally, the radius of curvature K of the fourth curved portion 301 satisfies 0.8mm≤K≤1.2mm. If the radius of curvature K is too small, it is easy to crack and will cause excessive local stress on the snap-fit ​​housing structure 100. If the radius of curvature K is too large, it is difficult to process.

[0065] Optionally, the sealing ring 200 is partially sandwiched between the fourth bend 301 and the third bend 7. The ratio X1 of the shortest distance J1 between the fourth bend 301 and the third bend 7 to the thickness T of the second housing 300 satisfies 80% ≤ X1 ≤ 120%. When the thickness of the second housing 300 is constant, the value of the shortest distance J1 between the fourth bend 301 and the third bend 7 will affect the thickness of the sealing ring 200 at this location, as well as the compression of the sealing ring 200. If J1 is too large, it will affect the energy density of the coin cell; if J1 is too small, it will affect the sealing performance and structural stability at this location. Therefore, when the value meets the above range, energy density, sealing performance, and structural stability can be simultaneously achieved.

[0066] It should be noted that, Figure 5 This is only a cross-sectional schematic diagram and may not necessarily conform to the preferred values. The description in the text should be taken as the standard.

[0067] Optionally, a portion of the sealing ring 200 is located between the inner wall of the fourth sidewall and the outer wall of the third sidewall 4, and the ratio X2 of the shortest distance J2 between the inner wall of the fourth sidewall and the outer wall of the third sidewall 4 to the thickness T of the second housing 300 satisfies 60% ≤ X2 ≤ 200%. Similarly, when the thickness of the second housing 300 is constant, the value of the shortest distance J2 between the inner wall of the fourth sidewall and the outer wall of the third sidewall 4 will affect the thickness of the sealing ring 200 at this location, as well as the compression of the sealing ring 200. An excessively large value of J2 will affect the energy density of the coin cell, while an excessively small value will affect the sealing performance and structural stability at this location. Therefore, when the value falls within the above range, energy density, sealing performance, and structural stability can be simultaneously considered.

[0068] Optionally, the sealing ring 200 is partially sandwiched between the end of the third sidewall 4 and the inner wall of the second end wall of the second housing 300. The ratio X3 of the shortest distance J3 between the end of the third sidewall 4 and the inner wall of the second end wall to the thickness T of the second housing 300 satisfies 340% ≤ X3 ≤ 560%. Similarly, when the thickness of the second housing 300 is constant, the value of the shortest distance J3 between the end of the third sidewall 4 and the inner wall of the second end wall will affect the thickness of the sealing ring 200 at this location, as well as the compression of the sealing ring 200. If the value of J3 is too large, it will affect the energy density of the coin cell; if the value of J3 is too small, it will affect the sealing performance and structural stability at this location. Therefore, when the value falls within the above range, energy density, sealing performance, and structural stability can be simultaneously considered.

[0069] Optionally, along the axial direction of the button cell structure 100, the ratio L of the maximum height of the sealing ring 200 to the overall height of the button cell battery satisfies 70% ≤ L ≤ 85%, that is, the ratio L of L1 to L2 in the figure satisfies the above-mentioned range. When the overall height of the button cell battery is constant, if the maximum height of the sealing ring 200 is too low, it will affect the sealing performance of the shoulder; if the maximum height of the sealing ring 200 is too high, it will hinder the sealing operation; and the excessively thick portion of the sealing ring 200 above the annular step surface 31 has no significant effect, resulting in material waste.

[0070] The following tests were conducted on button cell batteries with different structural designs. In Example 1, a sealing ring 200 made of polypropylene PP8830 was used. The values ​​of J1, J2, and J3 were 0.33 mm, 0.3 mm, and 0.5 mm, respectively. After the second shell 300 was sealed, the radius of curvature K of the fourth bending part 301 was 1.2 mm. The negative electrode shell structure adopted the button cell shell structure 100 of this embodiment, and the second shell 300 served as the positive electrode shell structure.

[0071] like Figure 6 As shown, Comparative Example 1 also uses a sealing ring made of polypropylene PP8830 material. The value of J1 is 0.33mm, the value of J2 is 0.3mm, and the value of J3 is 0.5mm. After the second shell is sealed, the radius of curvature K of the fourth bend is 1.2mm. The side wall of the negative electrode shell structure 100' has a curved surface and a flange 1'.

[0072] like Figure 1 As shown, Comparative Example 2 also uses a sealing ring made of polypropylene PP8830 material. The value of J1 is 0.33mm, the value of J2 is 0.3mm, and the value of J3 is 0.5mm. After the second shell is sealed, the radius of curvature K of the fourth bend is 1.2mm. The side wall 3' of the negative electrode shell structure 100' has no curved surface and has a flange 1'.

[0073] The button cells of Example 1, Comparative Example 1, and Comparative Example 2 were measured and remeasured under high temperature storage. The results are shown in Table 1 below.

[0074] As can be seen from the experimental results in Table 1 below, the button cell battery using the button housing structure 100 of this embodiment as the negative electrode housing structure has a higher cell capacity and a lower weight loss rate, meaning less electrolyte evaporation. This button cell battery can achieve the purpose of improving sealing performance, and can effectively prevent poor internal contact caused by deformation of the negative electrode housing structure due to thermal expansion of the sealing ring 200 in high-temperature environments. Therefore, the battery characteristics will not deteriorate, and the battery's electrical performance stability is higher.

[0075] Table 1

[0076]

[0077] This button cell can help increase the internal space of the button cell, increase the capacity of the button cell, and help prevent electrolyte leakage, thus ensuring the sealing performance of the button cell.

[0078] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A clasp housing structure characterized by, The first end wall (1) and the side wall, the side wall comprises a first side wall (2), a second side wall (3) and a third side wall (4) connected in sequence, the second side wall (3) has an annular step surface (31) facing one side of the first end wall (1), one end of the first side wall (2) is connected to the edge of the first end wall (1) in a circumferential direction, the other end is connected to the inner ring of the second side wall (3) in a circumferential direction, one end of the third side wall (4) is connected to the outer ring of the second side wall (3) in a circumferential direction, the other end extends away from the first end wall (1), the included angle A between the second side wall (3) and the third side wall (4) satisfies 90°≤A≤95°, the connection between the second side wall (3) and the third side wall (4) is curved to form an annular first curved portion (5), the radius of curvature B of the first curved portion (5) satisfies 0.1mm≤B≤2mm.

2. The clasp housing structure according to claim 1, wherein The included angle C between the first end wall (1) and the first side wall (2) satisfies 90°≤C≤98°.

3. The clasp housing structure according to claim 2, wherein The connection between the first end wall (1) and the first side wall (2) is curved to form an annular second curved portion (6), the radius of curvature D of the second curved portion (6) satisfies 0.1mm≤D≤2mm.

4. The clasp housing structure according to claim 1, wherein The included angle E between the first side wall (2) and the second side wall (3) satisfies 90°≤E≤95°.

5. The clasp housing structure according to claim 4, wherein The connection between the first side wall (2) and the second side wall (3) is curved to form an annular third curved portion (7), the radius of curvature F of the third curved portion (7) satisfies 0.05mm≤F≤1mm.

6. The clasp housing structure according to any one of claims 1 to 5, wherein The first end wall (1) and the first side wall (2) are curved to form an annular second curved portion (6), the highest curvature of the second curved portion (6) is projected to a first ring on the plane of the first end wall (1), the highest curvature of the first curved portion (5) is projected to a second ring on the plane of the first end wall (1), the shortest distance G between the first ring and the second ring satisfies 0.3mm≤G≤1.5mm; And / or, the first end wall (1) and the first side wall (2) are curved to form an annular second curved portion (6), the highest curvature of the second curved portion (6) is projected to a first point on the axis of the first end wall (1), the highest curvature of the first curved portion (5) is projected to a second point on the axis of the first end wall (1), the distance H between the first point and the second point satisfies 0.35mm≤H≤1.3mm; And / or, the highest curvature of the first curved portion (5) is projected to a second point on the axis of the first end wall (1), one end edge of the third side wall (4) away from the second side wall (3) is projected to a third point on the axis of the first end wall (1), the distance I between the second point and the third point satisfies 0.3mm≤I≤1.88mm.

7. A button cell battery characterized by The sealing ring (200), the second shell (300) and the buckle shell structure according to any one of claims 1-6 are all box-shaped structures with openings, the buckle shell structure is inserted into the second shell (300), the opening direction of the second shell (300) is opposite to the opening direction of the buckle shell structure, and the sealing ring (200) is used to circumferentially block the gap between the side wall and the fourth side wall of the second shell (300).

8. The button cell of claim 7, wherein, The sealing ring (200) covers the third side wall (4), the first curved portion (5) and part of the second side wall (3).

9. The button cell of claim 7, wherein, The opening edge of the second shell (300) is inwardly curved to form a fourth curved portion (301), and the curvature radius K of the fourth curved portion (301) satisfies 0.8mm≤K≤1.2mm; And / or, the connection between the first side wall (2) and the second side wall (3) is curvedly transitioned to form an annular third curved portion (7), the sealing ring (200) is partially clamped between the fourth curved portion (301) and the third curved portion (7), and the ratio X1 of the shortest distance J1 between the fourth curved portion (301) and the third curved portion (7) to the thickness T of the second shell (300) satisfies 80%≤X1≤120%; And / or, the sealing ring (200) is partially located between the inner wall of the fourth side wall and the outer wall of the third side wall (4), and the ratio X2 of the shortest distance J2 between the inner wall of the fourth side wall and the outer wall of the third side wall (4) to the thickness T of the second shell (300) satisfies 60%≤X2≤200%; And / or, the sealing ring (200) is partially clamped between the end of the third side wall (4) and the inner wall of the second end wall of the second shell (300), and the ratio X3 of the shortest distance J3 between the end of the third side wall (4) and the inner wall of the second end wall to the thickness T of the second shell (300) satisfies 340%≤X3≤560%.

10. The button cell of claim 7, wherein, Along the axial direction of the buckle shell structure, the ratio L of the maximum height of the sealing ring (200) to the overall height of the buckle battery satisfies 70%≤L≤85%.

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