Battery

Abstract

The utility model discloses a battery which comprises a first shell, a second shell, a positive electrode ring, a positive electrode plate and a negative electrode plate, the first shell and the second shell are arranged in an insulating manner, and the first shell and the second shell jointly enclose to form an accommodating space. The positive electrode ring is arranged in the accommodating space, the positive electrode ring comprises a mounting part and a first conductive part, a mounting space is defined by the mounting part, the first conductive part is arranged on one side of the mounting space, an avoiding space is formed between the first conductive part and the mounting space, and at least part of the first conductive part extends in the direction away from the accommodating space; one end of the first conductive part is connected to the mounting part, and the other end of the first conductive part abuts against the first shell and elastically deforms in the direction close to the accommodating space. The positive plate is inserted into the accommodating space and is electrically connected with the first shell through the positive ring; and the negative plate is arranged in the accommodating space and is electrically connected with the second shell. The battery solves the technical problem that the performance of the battery is reduced due to gas generated by the battery in the use process.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery. Background Technology

[0002] Lithium manganese dioxide batteries are a common type of battery widely used in consumer electronics, energy storage systems, and power tools. They mainly consist of six parts: a negative electrode base, a negative electrode, a separator, a positive electrode (including the positive electrode current collector), a positive electrode shell, and an electrolyte. Among these components, the positive electrode current collector plays a crucial role in current conduction, and its design significantly impacts battery performance, lifespan, and operational stability. Currently, lithium manganese dioxide batteries typically employ two designs for their positive electrode current collectors: a bowl-shaped ring structure and a current collector mesh structure.

[0003] However, during use, gas may be generated inside lithium metal coin cells, causing the battery to expand and increase in temperature. As expansion occurs, the contact area between the positive electrode current collector and the steel casing gradually decreases, resulting in a gradual decline in the battery's discharge performance and pulse capability, which cannot meet the requirements of high-temperature applications. Utility Model Content

[0004] One objective of this invention is to provide a battery that addresses the technical problem of battery performance degradation caused by gas generated during battery use.

[0005] To achieve the above objectives, this utility model provides a solution: a battery comprising: a first housing and a second housing, insulated from each other, a positive electrode ring, a positive electrode plate, and a negative electrode plate, wherein the first housing and the second housing together enclose a receiving space. The positive electrode ring is disposed within the receiving space and includes a mounting portion and a first conductive portion. The mounting portion encloses the mounting space, and the first conductive portion is disposed on one side of the mounting space. A clearance space is formed between the first conductive portion and the mounting space. At least a portion of the first conductive portion extends away from the receiving space. One end of the first conductive portion is connected to the mounting portion, and the other end abuts against the first housing and undergoes elastic deformation towards the receiving space. The positive electrode plate is inserted into the receiving space and electrically connected to the first housing via the positive electrode ring. The negative electrode plate is disposed inside the receiving space and electrically connected to the second housing.

[0006] Optionally, the first conductive part includes a first sub-part, which is disposed on one side of the mounting space and extends away from the receiving space. The first sub-part surrounds and forms a clearance space. One end of the first sub-part is connected to the mounting part, and the other end abuts against the first housing and elastically deforms in the direction closer to the receiving space.

[0007] Optionally, the first conductive part includes a second sub-part, the first sub-part and the second sub-part together enclose a clearance space, the second sub-part is disposed on the side of the clearance space away from the installation space, and the angle between the second sub-part and the axis of the receiving space is greater than the angle between the first sub-part and the axis of the receiving space.

[0008] Optionally, the angle between the first sub-part and the axis of the accommodating space is C, where 60°≤C≤80°.

[0009] Optionally, the width of the accommodating space gradually increases in the direction away from the vacating space.

[0010] Optionally, the angle between the inner wall of the mounting part and the axial direction of the receiving space is E, where 5°≤E≤13°.

[0011] Optionally, along the axial direction of the accommodating space, the size of the mounting part is H1, and the size of the first conductive part is H2, where 0.8 ≤ H1 / H2 ≤ 3.2.

[0012] Optionally, the wall thickness of the positive electrode ring is D1, 0.1 (mm) ≤ D1 ≤ 0.3 (mm).

[0013] Optionally, the positive electrode plate protrudes from the installation space in a direction away from the clearance space;

[0014] The battery includes a separator that covers the positive electrode and the edge of the mounting portion to separate the positive electrode and the negative electrode. The positive electrode, the separator, and the mounting portion together form a space.

[0015] Optionally, the positive electrode protrudes from the mounting space by a dimension H3 along the axial direction of the accommodating space, where 0.02 (mm) ≤ H3 ≤ 1 (mm).

[0016] Optionally, the first conductive portion has an opening that communicates with the clearance space. The battery includes a second conductive portion that passes through the opening into the clearance space, with one end connected to the first housing and the other end abutting against the positive electrode plate.

[0017] Optionally, the radius of the opening is R1, and the diameter of the accommodating space is R2, where 0.2≤R1 / R2≤0.8.

[0018] The beneficial effects of this utility model are as follows:

[0019] The battery includes an insulated first and second housing, a positive electrode ring, a positive electrode plate, and a negative electrode plate. The first and second housings together enclose a receiving space. The positive electrode ring is disposed in the receiving space and includes a mounting portion and a first conductive portion. The mounting portion encloses the mounting space, and the first conductive portion is disposed on one side of the mounting space. A clearance space is formed between the first conductive portion and the mounting space. At least a portion of the first conductive portion extends away from the receiving space. One end of the first conductive portion is connected to the mounting portion, and the other end abuts against the first housing and undergoes elastic deformation toward the receiving space. The positive electrode plate is inserted into the receiving space and is electrically connected to the first housing via the positive electrode ring. The negative electrode plate is disposed inside the receiving space and is electrically connected to the second housing.

[0020] In practical applications, the positive electrode sheet achieves a reliable electrical connection with the first casing via a positive electrode ring. Specifically, the first conductive part is made of an elastic material. During battery use, when the cell generates gas due to electrochemical reactions, causing an increase in internal pressure and resulting in localized outward expansion of the first casing, the elastic first conductive part can adapt to the deformation of the casing, restoring its elastic deformation in a direction away from the internal space. This maintains stable contact with the first casing and avoids poor contact caused by deformation. This not only effectively solves the problem of unreliable connection between the first conductive part and the first casing in traditional rigid connection structures under conditions of dimensional tolerances, thermal expansion and contraction, or gas expansion, but also further enhances the structural stability, electrical reliability, and operational safety of the battery by buffering stress with clearance space and improving assembly adaptability. It is suitable for energy storage or power battery systems with high requirements for environmental adaptability and reliability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the cross-sectional structure of the positive electrode ring provided in this embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the positive electrode ring provided in this embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of the battery provided in an embodiment of the present utility model;

[0025] Figure 4 This is provided by the embodiment of the present utility model. Figure 3A magnified schematic diagram of a portion of region A in the middle.

[0026] Explanation of icon numbers:

[0027] 20. Positive electrode ring; 21. Mounting part; 22. Mounting space; 23. First conductive part; 231. First sub-part; 232. Second sub-part; 233. Opening; 24. Clearance space; 30. First housing; 40. Second housing; 50. Positive electrode plate; 60. Negative electrode plate; 70. Separator; 80. Second conductive part; 90. Receiving space; 100. Spacing space; 110. Axial direction of the receiving space. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1 to 3 As shown, Figure 1 This is a schematic cross-sectional view of the positive electrode ring 20 provided in this embodiment of the present invention. Figure 2 This is a schematic cross-sectional view of the positive electrode ring 20 provided in this embodiment of the present invention. Figure 3 This is a schematic diagram of the cross-sectional structure of the battery provided in an embodiment of this utility model.

[0030] This utility model provides a battery comprising an insulated first housing 30 and a second housing 40, a positive electrode ring 20, a positive electrode plate 50, and a negative electrode plate 60. The first housing 30 and the second housing 40 together enclose a receiving space 90. The positive electrode ring 20 is disposed in the receiving space 90 and includes a mounting portion 21 and a first conductive portion 23. The mounting portion 21 encloses a mounting space 22, and the first conductive portion 23 is disposed on one side of the mounting space 22. A clearance space 24 is formed between the first conductive portion 23 and the mounting space 22. At least a portion of the first conductive portion 23 extends away from the receiving space 90. One end of the first conductive portion 23 is connected to the mounting portion 21, and the other end abuts against the first housing 30 and undergoes elastic deformation toward the receiving space 90. The positive electrode plate 50 is inserted into the receiving space 90 and is electrically connected to the first housing 30 through the positive electrode ring 20. The negative electrode plate 60 is disposed inside the receiving space 90 and is electrically connected to the second housing 40.

[0031] In practical applications, the positive electrode 50 achieves a reliable electrical connection with the first housing 30 via the positive electrode ring 20. Specifically, the first conductive part 23 is made of an elastic material. During battery use, when the cell generates gas due to electrochemical reactions, causing an increase in internal pressure within the containment space 90, and consequently causing the first housing 30 to partially expand outwards, the elastic first conductive part 23 can adapt to the deformation of the housing, restoring its elastic deformation in a direction away from the containment space 90. This maintains stable contact with the first housing 30 and avoids poor contact caused by deformation.

[0032] When the air pressure inside the housing space 90 returns to normal, the steel shell resumes its deformation, and the first conductive part 23 undergoes elastic deformation in the direction closer to the housing space 90. At this time, the clearance space 24 provides space for the first conductive part 23 to undergo elastic deformation. Through the above structural design, not only is the unreliable connection between the first conductive part 23 and the first shell 30 in traditional rigid connection structures under scenarios of dimensional tolerance, thermal expansion and contraction, or gas expansion effectively solved, but the clearance space 24 also buffers stress and improves assembly adaptability, further enhancing the structural stability, electrical reliability, and safety of the battery. It is suitable for energy storage or power battery systems with high requirements for environmental adaptability and high reliability.

[0033] In this embodiment, the accommodating space 90 is a frustum-shaped section with an isosceles trapezoidal cross section, and at least a portion of the first conductive portion 23 is inclined to the axial direction 110 of the accommodating space and extends in a direction away from the accommodating space 90.

[0034] In one embodiment, see Figure 1 and Figure 3 The first conductive part 23 includes a first sub-part 231, which is disposed on one side of the mounting space 22 and extends away from the receiving space 90. The first sub-part 231 surrounds and forms a clearance space 24. One end of the first sub-part 231 is connected to the mounting part 21, and the other end abuts against the first housing 30 and elastically deforms in the direction close to the receiving space 90.

[0035] In practical applications, one end of the first sub-part 231 is fixedly connected to the mounting part 21, while the other end abuts against the inner surface of the first housing 30. When the housing deforms outward due to gas expansion, the sub-part 231 elastically deforms in a direction away from the accommodating space 90, thereby maintaining the electrical connection between the first sub-part 231 and the first housing 30. This allows the first sub-part 231 to adapt to micro-deformation of the housing caused by internal gas pressure fluctuations or component tolerances. While ensuring the stability of the conductive path of the positive electrode 50, the first sub-part 231, and the first housing 30, it also improves the adaptability and error tolerance during component assembly, effectively solving the problem of poor contact or even decreased electrical performance caused by loose fit or large deformation in traditional rigid conductive structures.

[0036] Further, see Figure 2 and Figure 3 The first conductive part 23 includes a second sub-part 232. The first sub-part 231 and the second sub-part 232 together enclose a clearance space 24. The second sub-part 232 is disposed on the side of the clearance space 24 away from the mounting space 22. The angle between the second sub-part 232 and the axis of the receiving space 90 is greater than the angle between the first sub-part 231 and the axis of the receiving space 90.

[0037] In practical applications, the angle between the second sub-part 232 and the axis of the receiving space 90 is greater than the angle between the first sub-part 231 and the axis of the receiving space 90, enabling the overall first conductive part 23 to form a multi-path deformation mechanism under stress, effectively dispersing the concentrated stress generated by the expansion of the first shell 30. Specifically, the pressure direction applied by the first shell 30 to the first conductive part 23 is the axial direction 110 of the receiving space. The angle between the first sub-part 231 and the axis of the receiving space 90 is smaller, and its extension direction is closer to the pressure direction, making it easier to undergo controllable elastic deformation, thus absorbing and buffering the pressure. On the other hand, the angle between the second sub-part 232 and the axis of the receiving space 90 is larger, and its extension direction is further away from the pressure direction, resulting in higher relative rigidity and a larger contact area with the first shell 30. This allows it to bear slight deformation while distributing some of the pressure, and provides a more stable contact interface, thereby avoiding material fatigue or connection failure caused by excessive local stress. Furthermore, by achieving elastic deformation fit through the first sub-part 231 and increasing the electrical contact area through the second sub-part 232, this structure effectively reduces contact internal resistance while ensuring the reliability of electrical connection, and enhances the battery's adaptability to pressure fluctuations, thereby improving the stability of the overall conductive path and the battery's service life.

[0038] In this embodiment, the second sub-part 232 is perpendicular to the axial direction 110 of the accommodating space. At this time, the second sub-part 232 does not share the pressure of the first housing 30, and the contact area between the second sub-part 232 and the first housing 30 is the largest, that is, the internal resistance of the battery is the smallest.

[0039] Optionally, see Figure 1 The angle between the first sub-part 231 and the axis of the accommodating space 90 is C, where 60°≤C≤80°.

[0040] In practical applications, the structural angle design is determined through a combination of mechanical analysis and elastic response requirements. Specifically, the included angle C controls the extension direction of the first sub-part 231, thereby affecting its stress state and deformation mode when the first housing 30 expands. When the included angle is less than 60°, the first sub-part 231 tends to be closer to the axial direction, increasing the range of elastic deformation and reducing the contact area between the first sub-part 231 and the first housing 30. When the included angle is greater than 80°, the first sub-part 231 is arranged more radially, which leads to an increase in its contact area with the first housing 30 and improved contact stability, but reduces the range of elastic deformation. Therefore, limiting the included angle to between 60° and 80° achieves a good balance between the deformation direction and structural elasticity, ensuring that the first sub-part 231 has excellent elastic response capabilities, effectively absorbing the stress caused by housing deformation, and maintaining stable and reliable electrical contact, thereby improving the adaptability and safety of the battery structure under high pressure or thermal expansion conditions.

[0041] In one embodiment, reference is made to Figure 1 The width of the accommodating space 90 gradually increases in the direction away from the yielding space 24.

[0042] In practical applications, the width of the receiving space 90 gradually decreases in the direction away from the clearance space 24, forming a gradually contracting conical structure. Since the positive electrode 50 is cylindrical, the conical transition structure of the receiving space 90 provides guidance during its insertion, aiding in the orientation and alignment of the positive electrode 50 during insertion, reducing insertion resistance, and improving assembly efficiency. Furthermore, as the insertion depth increases, the width of the receiving space 90 gradually tightens, enabling a reliable locking fit when the positive electrode 50 is inserted to the predetermined position, preventing axial sliding or wobbling of the positive electrode 50, thus achieving stable mechanical positioning. This design achieves rapid and accurate positioning and retention of the positive electrode 50 without relying on additional limiting components or clamping structures, effectively improving the stability of the electrical connection and enhancing the overall structural compactness and reliability of the battery.

[0043] Furthermore, referring to Figure 1 The angle between the inner wall of the mounting part 21 and the axial direction of the accommodating space 90 is E, where 5°≤E≤13°.

[0044] In practical applications, an angle E is provided between the inner wall of the mounting portion 21 and the axis of the receiving space 90, and this angle satisfies 5°≤E≤13°. This inclined design allows the mounting portion 21 to form a micro-conical structure, providing a more reliable nesting fit between the positive electrode ring 20 and the positive electrode plate 50. On the one hand, during assembly, the inclined inner wall has a guiding function, which helps the positive electrode plate 50 to be smoothly inserted into the mounting portion 21 and automatically corrects eccentricity, improving assembly efficiency. On the other hand, after the positive electrode plate 50 is inserted, due to the limitation of the inner wall angle, a limiting effect is applied to the positive electrode plate 50 in the axial or radial direction, enhancing the mechanical locking effect and preventing contact loosening caused by factors such as vibration and thermal expansion and contraction. In addition, the range of this angle has been optimized to ensure smooth insertion without affecting the reliability of the electrical connection between the positive electrode plate 50 and the first conductive portion 23, thereby improving the overall structural stability and long-term reliability.

[0045] In one embodiment, reference is made to Figure 1 Along the axial direction 110 of the accommodating space, the size of the mounting part 21 is H1, the size of the first conductive part 23 is H2, and 0.8≤H1 / H2≤3.2.

[0046] In one embodiment, reference is made to Figure 2 The wall thickness of the positive electrode ring 20 is D1, 0.1 (mm) ≤ D1 ≤ 0.3 (mm).

[0047] In practical applications, the positive electrode ring 20 serves as the electrical connection medium between the positive electrode sheet 50 and the first casing 30. Its wall thickness design directly affects conductivity, elastic deformation capability, and space utilization efficiency. If D1 is less than 0.1 mm, insufficient mechanical strength may result, making it susceptible to structural damage or contact failure due to changes in internal battery pressure. If D1 is greater than 0.3 mm, it will occupy limited storage space 90, affecting battery energy density and increasing rigidity, thus reducing its adaptability to casing expansion. By limiting the wall thickness to between 0.1 and 0.3 mm, not only are the structural strength and conductivity of the positive electrode ring 20 guaranteed, but its elastic strain capability under changes in internal battery pressure is also improved, thereby enhancing the overall structural reliability and operational stability of the battery.

[0048] In one embodiment, reference is made to Figure 3 and Figure 4 The positive electrode 50 protrudes from the mounting space 22 in a direction away from the clearance space 24;

[0049] The battery includes a separator 70, which covers the positive electrode 50 and the edge of the mounting portion 21 to separate the positive electrode 50 and the negative electrode 60. The positive electrode 50, the separator 70 and the mounting portion 21 together form a space 100.

[0050] In practical applications, because the positive electrode 50 protrudes from the mounting space 22, a gap 100 is formed between the separator 70 and the mounting portion 21. This effectively reduces direct contact between the edges of the separator 70 and the mounting portion 21, lowering the risk of the edge of the mounting portion 21 scratching the separator 70 during battery vibration or thermal expansion, thus improving the safety and reliability of the battery's internal structure. This design not only improves the isolation effect between the positive and negative electrodes but also enhances the battery's durability, making it suitable for energy storage batteries or power battery systems with high requirements for controlling internal short-circuit risks.

[0051] Furthermore, referring to Figure 4 Along the axial direction 110 of the accommodating space, the positive electrode 50 protrudes from the mounting space 22 by a dimension of H3, where 0.02 (mm) ≤ H3 ≤ 1 (mm).

[0052] In one embodiment, reference is made to Figure 1 and Figure 3 The first conductive part 23 has an opening 233, which is connected to the clearance space 24. The battery includes a second conductive part 80, which passes through the opening 233 into the clearance space 24, with one end connected to the first housing 30 and the other end abutting against the positive electrode 50.

[0053] In practical applications, this structural design allows the positive current to form an effective conductive path via the first housing 30, the second conductive part 80, and the positive electrode plate 50. Compared to traditional structures that rely solely on the first conductive part 23 for conductivity, this embodiment introduces the second conductive part 80 to create redundant conductive paths within the structure. This improves current conduction efficiency, reduces internal resistance, and enhances the battery's thermal stability and electrical connection reliability under high-current discharge conditions. Furthermore, the interconnected arrangement of the opening 233 and the clearance space 24 allows the second conductive part 80 to be flexibly placed within the internal space without affecting its original elastic deformation function, achieving a balance between conductivity and structural elasticity.

[0054] Furthermore, referring to Figure 1 The radius of the opening 233 is R1, the diameter of the accommodating space 90 is R2, and 0.2≤R1 / R2≤0.8.

[0055] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0056] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0057] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0058] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A battery, characterized in that, include: A first housing and a second housing with insulating features, the first housing and the second housing together enclosing a receiving space; A positive electrode ring is disposed in the receiving space. The positive electrode ring includes a mounting portion and a first conductive portion. The mounting portion surrounds and forms a mounting space. The first conductive portion is disposed on one side of the mounting space. A clearance space is formed between the first conductive portion and the mounting space. At least a portion of the first conductive portion extends away from the receiving space. One end of the first conductive portion is connected to the mounting portion, and the other end abuts against the first housing and undergoes elastic deformation in the direction closer to the receiving space. A positive electrode plate, which is inserted into the receiving space and electrically connected to the first housing via the positive electrode ring; A negative electrode is disposed inside the receiving space and is electrically connected to the second housing.

2. The battery according to claim 1, characterized in that, The first conductive part includes a first sub-part, which is disposed on one side of the mounting space and extends away from the receiving space. The first sub-part surrounds and forms the clearance space. One end of the first sub-part is connected to the mounting part, and the other end abuts against the first housing and elastically deforms toward the receiving space.

3. The battery according to claim 2, characterized in that, The first conductive portion includes a second sub-portion, and the first sub-portion and the second sub-portion together enclose the clearance space. The second sub-portion is disposed on the side of the clearance space away from the mounting space, and the angle between the second sub-portion and the axis of the receiving space is greater than the angle between the first sub-portion and the axis of the receiving space.

4. The battery according to claim 2, characterized in that, The angle between the first sub-part and the axis of the accommodating space is C, where 60°≤C≤80°.

5. The battery according to claim 1, characterized in that, The width of the accommodating space gradually increases in the direction away from the vacating space.

6. The battery according to claim 5, characterized in that, The angle between the inner wall of the mounting part and the axial direction of the accommodating space is E, where 5°≤E≤13°.

7. The battery according to claim 1, characterized in that, Along the axial direction of the accommodating space, the size of the mounting part is H1, the size of the first conductive part is H2, and 0.8≤H1 / H2≤3.

2.

8. The battery according to claim 1, characterized in that, The wall thickness of the positive electrode ring is D1, 0.1 (mm) ≤ D1 ≤ 0.3 (mm).

9. The battery according to claim 1, characterized in that, The positive electrode plate protrudes from the mounting space in a direction away from the clearance space; The battery includes a separator that covers the positive electrode and the edge of the mounting portion to separate the positive electrode and the negative electrode. The positive electrode, the separator, and the mounting portion together form a space.

10. The battery according to claim 9, characterized in that, Along the axial direction of the accommodating space, the positive electrode protrudes from the mounting space by a dimension of H3, where 0.02 (mm) ≤ H3 ≤ 1 (mm).

11. The battery according to claim 1, characterized in that, The first conductive part has an opening, and the opening is connected to the clearance space; The battery includes a second conductive part, which passes through the opening into the clearance space, with one end connected to the first housing and the other end abutting against the positive electrode plate.

12. The battery according to claim 11, characterized in that, The radius of the opening is R1, and the diameter of the accommodating space is R2, where 0.2 ≤ R1 / R2 ≤ 0.8.

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