Connection structure, individual battery cells and battery pack

Abstract

This utility model relates to the field of battery technology, providing a connection structure, a single battery cell, and a battery pack. The connection structure includes an output component and terminals. The output component is configured to output electrical energy. A connection groove is formed in the output component. The terminals have a first protrusion extending towards the output component. At least a portion of the first protrusion engages with the connection groove. This avoids increased resistance or decreased mechanical strength at the connection between the terminals and the output component, improving the reliability of the connection and reducing the possibility of battery cell safety accidents.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a connection structure, a single battery cell, and a battery pack. Background Technology

[0002] In related technologies, power batteries serve as the driving energy source for new energy vehicles, possessing advantages such as high energy, high capacity, and high power. Within a single battery cell, the positive terminal and positive post, as well as the negative current collector and casing, are typically fixed using welding. The welding process is prone to generating oxide layers or thermal stress cracks due to high temperatures, leading to increased resistance and decreased mechanical strength at the weld joint. Under vehicle vibration or temperature changes, cracks can easily form at the weld joint, causing poor contact. Prolonged use can significantly increase internal resistance, potentially leading to cell safety incidents. Utility Model Content

[0003] The embodiments of this utility model provide a connection structure, a single battery cell, and a battery pack, which can improve the technical problem of increased resistance and decreased mechanical strength caused by welding and fixing between the terminals and the electrode of a single battery cell.

[0004] In a first aspect, embodiments of the present invention provide a connection structure, comprising:

[0005] An output element, configured to output electrical energy, has a connecting groove formed thereon;

[0006] The pole has a first protrusion protruding toward the output component, at least a portion of which engages with the connecting groove.

[0007] This avoids increased resistance or decreased mechanical strength at the connection between the terminal and the output component, improving the reliability of the connection and reducing the possibility of cell safety accidents.

[0008] In one embodiment, the first protrusion is riveted to the output component.

[0009] This avoids increased resistance or decreased mechanical strength at the connection between the electrode and the output component due to welding, giving the individual battery cell better strength in dynamic environments such as vibration and temperature cycling, thus ensuring the safety of the individual battery cell.

[0010] In one embodiment, the first protrusion is configured as annular, and along the direction from the pole to the output member, the first protrusion is inclined in a direction away from its axis.

[0011] This allows the first protrusion to form a mechanical interlock structure with the output component, and also increases the area through which current can pass, thus preventing high-temperature failure.

[0012] In one embodiment, the output member has a first end face facing the pole and a second end face away from the pole, the connecting groove is recessed into the output member from the first end face, and the second end face is provided with a second protrusion corresponding to the first protrusion.

[0013] Under the action of external riveting force, the first protrusion of the pole is embedded into the output component. As at least part of the first protrusion is embedded into the output component, the material of the output component flows and undergoes significant deformation. As a result, a connecting groove for receiving the first protrusion is formed on the first end face of the output component, and a second protruding part is formed on the second end face.

[0014] In one embodiment, the height of the second protrusion is A, which satisfies: 0 < A ≤ 5 mm.

[0015] This prevents the first protrusion from breaking during the riveting process, thus avoiding potential safety risks to the battery cell.

[0016] In one embodiment, the second protrusion is configured as an annular shape, and the distance between the two opposite sides of the second protrusion is B, satisfying: 0.3 mm ≤ B ≤ 20 mm.

[0017] This ensures that the first protrusion can be riveted to the output component and prevents the first protrusion from breaking during the riveting process, thus avoiding potential safety risks to the battery cell.

[0018] In one embodiment, the first protrusion is located between the first end face and the second end face, the distance between the first protrusion and the second end face is C, and the thickness of the output component is H, satisfying: 0 < C / H ≤ 0.7.

[0019] This ensures that the material flow performance meets design requirements and prevents the first protrusion from breaking during the riveting process, thus avoiding safety risks to the battery cell.

[0020] In one embodiment, the first protrusion protrudes through the second end face and extends into the second protrusion. The distance between the first protrusion and the second end face is C, and the thickness of the output component is H, satisfying: 0 < C / H ≤ 1.

[0021] This ensures that the material flow performance meets design requirements and prevents the first protrusion from breaking during the riveting process, thus avoiding safety risks to the battery cell.

[0022] In one embodiment, the outer peripheral surface of the pole post is provided with a connecting portion that protrudes radially outward, the connecting portion being configured to connect with a welding base plate and / or a pole lug.

[0023] This allows for the connection between the electrode post and the welding base plate or the negative electrode tab.

[0024] In one embodiment, the diameter of the pole is D, and the diameter of the connector is E, satisfying: 1 < E / D ≤ 2.5.

[0025] This ensures that the connection can form a snap-fit ​​structure and avoids excessive material costs.

[0026] In one embodiment, the diameter of the pole is D, and the length of the contact surface between the connecting part and the welding base plate is G, satisfying: 0.05≤G / D≤0.5.

[0027] This ensures sufficient flow area between the connection and the welding base plate, and avoids excessive material costs.

[0028] In one embodiment, the electrode tab includes a negative electrode tab, the thickness of the connecting portion is J, and the thickness of the negative electrode tab is K, satisfying: 0.1≤J / K≤5.

[0029] This ensures that the connection part and the negative electrode tab can be welded and fixed by through welding.

[0030] In one embodiment, the output component includes a positive terminal, the terminal post includes a positive terminal post, and the connection portion is configured to be welded to the welding base plate;

[0031] And / or, the output component includes a negative electrode cover, the electrode post includes a negative electrode post, the electrode tab includes a negative electrode tab, and the connection portion is configured to be welded to the negative electrode tab.

[0032] This allows the positive terminal, positive terminal, and welding base plate to be electrically connected, and the negative terminal, negative cover plate, and negative electrode tab to be electrically connected.

[0033] In one embodiment, the outer peripheral surface of the negative electrode post is provided with an insulating layer.

[0034] This achieves insulation between the negative terminal and the winding core.

[0035] In one embodiment, the thickness of the insulating layer is I, which satisfies: 0.002 mm ≤ I ≤ 0.5 mm.

[0036] This ensures insulation performance and prevents excessive costs and situations where the negative terminal cannot be assembled into the winding channel of the core.

[0037] Secondly, embodiments of this utility model provide a single battery cell, comprising:

[0038] case;

[0039] A positive electrode connection structure is connected to one end of the housing;

[0040] The negative electrode connection structure is connected to the other end of the housing;

[0041] Wherein, at least one of the positive electrode connection structure and the negative electrode connection structure adopts the connection structure as described above.

[0042] This avoids increased resistance or decreased mechanical strength at the connection between the terminal and the output component, improving the reliability of the connection and reducing the possibility of cell safety accidents.

[0043] In one embodiment, the positive electrode connection structure includes:

[0044] Positive extreme;

[0045] The positive terminal post is riveted to the positive terminal;

[0046] The positive terminal and / or the positive terminal post are connected to one end of the housing.

[0047] This creates a mechanical interlocking structure between the positive terminal and the positive terminal, eliminating the need for welding or chemical bonding to connect them. This avoids affecting the strength between the positive terminal and the positive terminal due to welding, ensuring the safety of the individual battery cell.

[0048] In one embodiment, the single cell further includes a winding core disposed within the housing, wherein a winding channel is formed within the winding core;

[0049] The negative electrode connection structure includes:

[0050] The negative electrode cover plate is connected to the other end of the housing;

[0051] The negative electrode post is disposed in the winding channel. One end of the negative electrode post extends out of the winding channel and is riveted to the negative electrode cover plate. The other end of the negative electrode post is spaced apart from the positive electrode post.

[0052] This creates a mechanical interlocking structure between the negative electrode post and the negative electrode cover, eliminating the need for welding or chemical bonding to connect them. This avoids affecting the strength between the negative electrode post and the negative electrode cover due to welding, ensuring the safety of the individual battery cell.

[0053] In one embodiment, the distance between the negative electrode post and the positive electrode post is F, which satisfies: F≥0.1 mm.

[0054] This ensures sufficient insulation width between the negative and positive terminals, preventing short circuits due to insufficient creepage distance.

[0055] In one embodiment, the two opposite ends of the winding core are respectively connected to a positive electrode tab and a negative electrode tab, the positive electrode tab being electrically connected to the positive electrode post, and the negative electrode tab being electrically connected to the negative electrode post.

[0056] This enables the charging and discharging of a single battery cell.

[0057] Thirdly, embodiments of this utility model provide a battery pack, including the single battery cell as described above.

[0058] This avoids increased resistance or decreased mechanical strength at the connection between the terminal and the output component, improving the reliability of the connection and reducing the possibility of cell safety accidents.

[0059] The beneficial effects of the embodiments of this utility model are as follows:

[0060] In this embodiment of the invention, the electrode post and the output component are fixed by the cooperation of the first protrusion and the connecting groove, replacing the traditional welding fixation. This avoids the formation of an oxide layer or thermal stress cracks at the connection between the electrode post and the output component due to the welding process. Therefore, it prevents an increase in resistance or a decrease in mechanical strength at the connection between the electrode post and the output component, improves the reliability of the connection, and reduces the possibility of cell safety accidents. Attached Figure Description

[0061] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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 these drawings without creative effort.

[0062] Figure 1 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this utility model;

[0063] Figure 2 This is a cross-sectional view of a single battery cell provided in an embodiment of this utility model;

[0064] Figure 3 This is a partial cross-sectional view of the positive and negative terminals provided in an embodiment of this utility model;

[0065] Figure 4 This is one of the partial cross-sectional views of the connection structure provided in the embodiments of this utility model;

[0066] Figure 5 This is a second partial cross-sectional view of the connection structure provided in an embodiment of this utility model;

[0067] Figure 6This is a third partial cross-sectional view of the connection structure provided in an embodiment of this utility model;

[0068] Figure 7 This is the fourth partial cross-sectional view of the connection structure provided in the embodiment of this utility model.

[0069] Explanation of reference numerals in the attached figures:

[0070] 1. Single cell; 11. Housing; 12. Positive electrode connection structure; 121. Positive terminal; 122. Positive electrode post; 13. Negative electrode connection structure; 131. Negative electrode post; 132. Negative electrode cover plate; 14. Core; 141. Winding channel; 142. Positive electrode tab; 143. Negative electrode tab; 15. Welding base plate;

[0071] 2. Output component; 21. Connecting groove; 22. First end face; 23. Second end face; 24. Second protrusion;

[0072] 3. Pole post; 31. First protrusion; 32. Connecting part;

[0073] 4. Insulation layer. Detailed Implementation

[0074] 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 skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0075] This application provides a battery pack. The battery pack includes a battery box and battery modules disposed within the battery box. The battery modules include multiple individual battery cells 1. The battery box provides a space for accommodating the individual battery cells 1, and the battery box can adopt various structures. In some embodiments, the battery box includes a casing and a top cover that overlap each other. The casing and the top cover together define an accommodating space for accommodating the individual battery cells 1. The casing can be a hollow structure, and the top cover can be a plate-like structure, with the top cover covering the opening side of the casing so that the top cover and the casing together define the accommodating space. Both the casing and the top cover can be hollow structures with an opening on one side, with the opening of the top cover covering the opening side of the casing. Of course, the battery box formed by the top cover and the casing can be of various shapes, such as a cylinder, a cuboid, etc.

[0076] In a battery pack, there can be multiple individual cells 1. These individual cells 1 can be connected in series, parallel, or in a hybrid configuration. A hybrid configuration means that multiple individual cells 1 are connected in both series and parallel configurations. Multiple individual cells 1 can be directly connected in series, parallel, or in a hybrid configuration, and then the entire assembly of these individual cells 1 is housed within a battery box. Alternatively, the battery pack can also consist of multiple individual cells 1 first connected in series, parallel, or in a hybrid configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a hybrid configuration to form a whole, which is then housed within a battery box. The battery pack may also include other structures; for example, it may include a busbar component for electrical connection between the multiple individual cells 1.

[0077] Each individual cell 1 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The individual cell 1 can be cylindrical, flat, cuboid, or other shapes.

[0078] like Figures 1 to 3 As shown in the figure, this application embodiment also provides a single battery cell 1. The single battery cell 1 includes a housing 11, a positive electrode connection structure 12, a negative electrode connection structure 13, a core 14 located inside the housing 11, and other functional components.

[0079] In some embodiments, both the positive electrode connection structure 12 and the negative electrode connection structure 13 include an output component 2 for outputting electrical energy and a pole post 3 riveted to the output component 2. The output component 2 has a connection groove 21, and the pole post 3 has a first protrusion 31 protruding toward the output component 2, at least a portion of the first protrusion 31 being riveted into the connection groove 21.

[0080] In some embodiments, the positive terminal connection structure 12 includes a positive terminal 121 and a positive terminal post 122. The positive terminal post 122 is riveted to the positive terminal 121. The positive terminal 121 and / or the positive terminal post 122 are connected to one end of the housing 11.

[0081] Understandably, the positive terminal 122 is riveted to the positive terminal 121. After the first protrusion 31 of the positive terminal 122 is riveted to the positive terminal 121, a connecting groove 21 is formed on the side of the positive terminal 121 facing the positive terminal 122. This creates a mechanical interlocking structure between the positive terminal 122 and the positive terminal 121, eliminating the need for welding or chemical bonding to achieve the connection. This avoids affecting the strength between the positive terminal 122 and the positive terminal 121 due to welding, ensuring the safety of the individual battery cell 1.

[0082] like Figure 2As shown, in some embodiments, a winding channel 141 is formed within the core 14. The negative electrode connection structure 13 includes a negative electrode cover plate 132 and a negative electrode post 131. The negative electrode cover plate 132 is connected to the other end of the housing 11. The negative electrode post 131 is disposed within the winding channel 141. One end of the negative electrode post 131 extends out of the winding channel 141 and is riveted to the negative electrode cover plate 132. The other end of the negative electrode post 131 is spaced apart from the positive electrode post 122.

[0083] Understandably, the negative electrode post 131 is riveted to the negative electrode cover plate 132. After the first protrusion 31 of the negative electrode post 131 is riveted to the negative electrode cover plate 132, a connecting groove 21 is formed on the side of the negative electrode cover plate 132 facing the negative electrode post 131. This creates a mechanical interlocking structure between the negative electrode post 131 and the negative electrode cover plate 132, eliminating the need for welding or chemical bonding to achieve the connection. This avoids affecting the strength between the negative electrode post 131 and the negative electrode cover plate 132 due to welding, ensuring the safety of the single cell 1.

[0084] In some embodiments, the positive terminal 122 and the negative terminal 131 can be formed by the breakage of an electrical connector. For example, the electrical connector includes a main body segment, a first connecting segment, and a second connecting segment. The first connecting segment is configured to be riveted to the positive terminal 121. The second connecting segment is configured to be riveted to the negative terminal cover 132. The electrical connector is disposed within the housing 11 and located in the winding channel 141 of the core 14. After the first connecting segment is riveted to the positive terminal 121, under the action of an external riveting force, the connection between the first connecting segment and the main body segment breaks, so that the first connecting segment forms the positive terminal 122, and the main body segment and the second connecting segment form the negative terminal 131, and the positive terminal 122 and the negative terminal 131 are spaced apart based on the gap of the breakage. By forming the positive terminal 122 and the negative terminal 131 by the breakage of an integrally formed electrical connector, the number of parts can be reduced, saving the cost of a single battery cell 1.

[0085] The embodiments of this application are based on the arrangement of the negative terminal 131 and the positive terminal 122 at intervals to insulate them from each other and prevent short circuits.

[0086] In some embodiments, an insulating layer 4 is provided on the outer surface of the negative electrode post 131 to ensure insulation between the negative electrode post 131 and the winding core 14.

[0087] like Figures 3 to 5 As shown, in some embodiments, the distance between the negative electrode post 131 and the positive electrode post 122 is F, which satisfies: F≥0.1 mm.

[0088] Understandably, the spacing between the negative terminal 131 and the positive terminal 122 is greater than or equal to 0.1 mm to ensure sufficient insulation width between them and prevent short circuits due to insufficient creepage distance.

[0089] In some embodiments, the distance between the negative electrode post 131 and the positive electrode post 122 can be set to 0.1 mm, 0.5 mm, 1 mm, or any value between the two. The distance between the negative electrode post 131 and the positive electrode post 122 can be reasonably selected based on the height of the individual cell 1.

[0090] like Figure 2 As shown, in some embodiments, the opposite ends of the winding core 14 are respectively connected to a positive electrode tab 142 and a negative electrode tab 143. The positive electrode tab 142 is electrically connected to the positive electrode post 122. The negative electrode tab 143 is electrically connected to the negative electrode post 131.

[0091] It is understandable that the positive electrode tab 142 of the core 14 is electrically connected to the positive electrode post 122, and the negative electrode tab 143 is electrically connected to the negative electrode post 131, so as to realize the external discharge of the single cell 1 or to charge the single cell 1.

[0092] In some embodiments, the positive electrode tab 142 is welded to the welding base plate 15. The welding base plate 15 is welded to the connection portion 32 of the positive electrode post 122. Thus, an electrical connection is achieved between the positive electrode tab 142 and the positive electrode post 122.

[0093] In some embodiments, the connection portion 32 between the negative electrode tab 143 and the negative electrode post 131 is welded. This achieves an electrical connection between the negative electrode tab 143 and the negative electrode post 131.

[0094] The housing 11 has a top plate at one end and an open design at the other end. The positive terminal 122 and positive terminal 121 are connected to the top plate, and are insulated from the top plate. The negative cover plate 132 is installed at the open position of the housing 11. Because the negative electrode tab 143 is electrically connected to the negative terminal 131, and the negative terminal 131 is electrically connected to the negative cover plate 132, the housing 11 becomes negatively charged.

[0095] like Figures 1 to 7 As shown, this application embodiment also provides a connection structure. The connection structure includes an output component 2 and a terminal post 3. The output component 2 is configured to output electrical energy. The output component 2 has a connection groove 21. The terminal post 3 has a first protrusion 31 protruding towards the output component 2. At least a portion of the first protrusion 31 engages with the connection groove 21.

[0096] In this embodiment, the electrode post 3 and the output component 2 are fixed together by the cooperation of the first protrusion 31 and the connecting groove 21, replacing the traditional welding fixation. This avoids the formation of an oxide layer or thermal stress cracks at the connection between the electrode post 3 and the output component 2 due to the welding process. Therefore, it prevents an increase in resistance or a decrease in mechanical strength at the connection between the electrode post 3 and the output component 2, improves the reliability of the connection, and reduces the possibility of cell safety accidents.

[0097] In some embodiments, a portion of the first protrusion 31 is embedded in the connecting groove 21 to fix the pole post 3 and the output component 2 together. Alternatively, the entire first protrusion 31 is embedded in the connecting groove 21 to fix the pole post 3 and the output component 2 together.

[0098] In some embodiments, the output component 2 is a positive terminal 121 or a negative terminal cover 132. When the output component 2 is a positive terminal 121, the terminal 3 is a positive terminal 122. When the output component 2 is a negative terminal cover 132, the terminal 3 is a negative terminal 131 or a negative current collector.

[0099] In some embodiments, the first protrusion 31 is riveted to the output member 2.

[0100] Understandably, the first protrusion 31 is riveted to the output component 2 to achieve mechanical interlocking between the electrode post 3 and the output component 2, eliminating the need for high-temperature connection or chemical bonding. This avoids the risk of a heat-affected zone during welding, giving the individual cell 1 better strength in dynamic environments such as vibration and temperature cycling, thus ensuring the safety of the individual cell 1.

[0101] When the output component 2 is connected to the pole post 3, the first protrusion 31 of the pole post 3 can be oriented toward the output component 2, and the pole post 3 and the output component 2 can be brought close to each other, so that the first protrusion 31 is riveted into the output component 2, and a connecting groove 21 for accommodating the first protrusion 31 is formed in the output component 2.

[0102] By riveting the pole 3 to the output component 2, the pole 3 and the output component 2 can be connected through plastic deformation, which increases the contact area between the pole 3 and the output component 2 and can significantly reduce the contact resistance.

[0103] Specifically, the positive terminal 122 is riveted to the positive terminal 121. After the first protrusion 31 of the positive terminal 122 is riveted to the positive terminal 121, a connecting groove 21 is formed on the side of the positive terminal 121 facing the positive terminal 122. This creates a mechanical interlocking structure between the positive terminal 122 and the positive terminal 121, eliminating the need for welding or chemical bonding. This avoids affecting the strength between the positive terminal 122 and the positive terminal 121 due to welding, ensuring the safety of the individual battery cell 1. The negative terminal 131 is riveted to the negative cover plate 132. After the first protrusion 31 of the negative terminal 131 is riveted to the negative cover plate 132, a connecting groove 21 is formed on the side of the negative cover plate 132 facing the negative terminal 131. This creates a mechanical interlocking structure between the negative electrode post 131 and the negative electrode cover plate 132, eliminating the need for welding or chemical bonding to connect them. This avoids affecting the strength between the negative electrode post 131 and the negative electrode cover plate 132 due to welding, ensuring the safety of the individual battery cell 1.

[0104] like Figure 4 and Figure 6 As shown, in some embodiments, the first protrusion 31 is configured as an annular shape. Furthermore, along the direction from the pole post 3 to the output member 2, the first protrusion 31 is inclined in a direction away from its axis.

[0105] It is understandable that the first protrusion 31 is an annular boss structure. After the first protrusion 31 is riveted to the output component 2, it can form a mechanical interlock structure with the output component 2 and increase the area through which current passes, thus avoiding high-temperature failure.

[0106] Regarding the positive electrode connection structure 12, the first protrusion 31 of the positive electrode post 122 is riveted to the positive terminal 121, thereby forming a mechanical interlocking structure between the positive electrode post 122 and the positive terminal 121. Based on the deformation of the positive terminal 121, the current-passing area of ​​the positive terminal 121 can be increased, avoiding high-temperature failure of the positive terminal 121 and / or the positive electrode post 122.

[0107] Regarding the negative electrode connection structure 13, the first protrusion 31 of the negative electrode post 131 is riveted to the negative electrode cover plate 132, thereby forming a mechanical interlocking structure between the negative electrode post 131 and the negative electrode cover plate 132. Based on the deformation of the negative electrode cover plate 132, the flow area of ​​the negative electrode cover plate 132 can be increased, avoiding high-temperature failure of the negative electrode cover plate 132 and / or the negative electrode post 131.

[0108] In some embodiments, the first protrusion 31 of the positive electrode post 122 has the same shape as the first protrusion 31 of the negative electrode post 131. Alternatively, the first protrusion 31 of the positive electrode post 122 has a different shape than the first protrusion 31 of the negative electrode post 131.

[0109] In some embodiments, the first protrusion 31 is configured as an annular shape.

[0110] In some embodiments, the first protrusion 31 may also be configured in other shapes. For example, the first protrusion 31 may be configured in other shapes such as hemispherical, rhomboid, or frustum, as long as the first protrusion 31 can be riveted into the output member 2 and the pole post 3 and the output member 2 can form a mechanical interlocking structure.

[0111] Please continue reading. Figure 4 and Figure 6 In some embodiments, the output member 2 has a first end face 22 facing the pole post 3 and a second end face 23 away from the pole post 3. A connecting groove 21 is recessed from the first end face 22 into the output member 2. The second end face 23 is provided with a second protrusion 24. The second protrusion 24 corresponds to the first protrusion 31.

[0112] Understandably, the first protrusion 31 of the pole post 3 is riveted to the output component 2, thereby forming a connecting groove 21 on the surface of the output component 2. Specifically, under the action of external riveting force, the first protrusion 31 of the pole post 3 is embedded into the output component 2. As at least part of the first protrusion 31 is embedded into the output component 2, the material of the output component 2 will flow and undergo significant deformation. As a result, the output component 2 can form a connecting groove 21 for receiving the first protrusion 31 on its first end face 22, and a second protruding part 24 on its second end face 23.

[0113] Since the second protrusion 24 is formed based on the first protrusion 31 riveted to the output member 2, the position of the second protrusion 24 corresponds to that of the first protrusion 31. For example, along the axial direction of the pole post 3, the projection of the second protrusion 24 partially overlaps with the projection of the first protrusion 31. Alternatively, along the axial direction of the pole post 3, the projection of the second protrusion 24 completely overlaps with the projection of the first protrusion 31. Alternatively, along the axial direction of the pole post 3, the projection of the second protrusion 24 covers the projection of the first protrusion 31.

[0114] Regarding the positive electrode connection structure 12, the first protrusion 31 of the positive electrode post 122 is riveted to the positive terminal 121, thereby forming a connection groove 21 on the surface of the positive terminal 121. Specifically, under the action of external riveting force, the first protrusion 31 of the positive electrode post 122 is embedded into the positive terminal 121. As the first protrusion 31 of the positive electrode post 122 is at least partially embedded in the positive terminal 121, the material of the positive terminal 121 flows and undergoes significant deformation. As a result, the positive terminal 121 can form a connection groove 21 for accommodating the first protrusion 31 on its first end face 22, and a second protruding part 24 is formed on its second end face 23.

[0115] Regarding the negative electrode connection structure 13, the first protrusion 31 of the negative electrode post 131 is riveted to the negative electrode cover plate 132, thereby forming a connection groove 21 on the surface of the negative electrode cover plate 132. Specifically, under the action of external riveting force, the first protrusion 31 of the negative electrode post 131 is embedded in the negative electrode cover plate 132. As the first protrusion 31 of the negative electrode post 131 is at least partially embedded in the negative electrode cover plate 132, the material of the negative electrode cover plate 132 will flow and undergo significant deformation. As a result, the negative electrode cover plate 132 can form a connection groove 21 for accommodating the first protrusion 31 on its first end face 22, and form an outwardly protruding second protrusion 24 on its second end face 23.

[0116] In some embodiments, the second protrusion 24 of the positive terminal 121 has the same shape as the second protrusion 24 of the negative terminal cover 132. Alternatively, the second protrusion 24 of the positive terminal 121 has a different shape than the second protrusion 24 of the negative terminal cover 132.

[0117] like Figure 4 and Figure 5 As shown, in some embodiments, the height of the second protrusion 24 is A, satisfying: 0 < A ≤ 5 mm.

[0118] It is understandable that the second protrusion 24 is a protruding structure formed by the deformation of the output component 2 and the second end face 23 after the first protrusion 31 is riveted to the first end face 22 of the output component 2. It is evident that the height of the second protrusion 24 is positively correlated with the height of the first protrusion 31. The greater the height of the second protrusion 24, the greater the required height of the first protrusion 31. In this embodiment, the height of the second protrusion 24 is kept to no more than 5 mm to prevent the first protrusion 31 from breaking during the riveting process due to excessive height, thus avoiding a safety risk to the battery cell.

[0119] In some embodiments, the height of the second protrusion 24 is set to 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or any value between the two.

[0120] Regarding the positive electrode connection structure 12, after the first protrusion 31 of the positive electrode post 122 is riveted into the first end face 22 of the positive electrode 121, a second protrusion 24 will be formed on the second end face 23 of the positive electrode 121. The height of the second protrusion 24 of the positive electrode 121 is less than or equal to 5 mm.

[0121] Regarding the negative electrode connection structure 13, after the first protrusion 31 of the negative electrode post 131 is riveted into the first end face 22 of the negative electrode cover plate 132, a second protrusion 24 will be formed on the second end face 23 of the negative electrode cover plate 132. The height of the second protrusion 24 of the negative electrode cover plate 132 is less than or equal to 5 mm.

[0122] In some embodiments, the second protrusion 24 of the positive terminal 121 has the same height as the second protrusion 24 of the negative terminal cover 132. Alternatively, the second protrusion 24 of the positive terminal 121 has a different height from the second protrusion 24 of the negative terminal cover 132.

[0123] like Figure 4 and Figure 5 As shown, in some embodiments, the second protrusion 24 is configured as an annular shape. The distance between the two sides of the second protrusion 24 is B, which satisfies the condition: 0.3 mm ≤ B ≤ 20 mm.

[0124] It is understandable that the second protrusion 24 is a protrusion structure formed by the deformation of the output member 2 and the second end face 23 after the first protrusion 31 is riveted to the first end face 22. It can be seen that the distance between the two sides of the second protrusion 24 is positively correlated with the distance between the two sides of the first protrusion 31. The larger the distance between the two sides of the second protrusion 24, the larger the required distance between the two sides of the first protrusion 31, and the larger the tilt angle or distance of the first protrusion 31 will be.

[0125] If the distance between the two sides of the second protrusion 24 is less than 0.3 mm, the material of the output component 2 will not be able to flow to both sides when the first protrusion 31 of the pole post 3 is riveted into the output component 2. Specifically, after the first protrusion 31 of the pole post 3 is riveted into the output component 2, the second protrusion 24 with a distance between the two sides of less than 0.3 mm cannot be formed.

[0126] If the distance between the second protrusion 24 and its two sides is greater than 20 mm, the first protrusion 31 of the pole post 3 will need a larger width or tilt angle, which may easily cause the first protrusion 31 of the pole post 3 to break and cause a cell safety risk.

[0127] In some embodiments, the distance between the opposite sides of the second protrusion 24 is set to 0.3 mm, 5 mm, 10 mm, 15 mm, 20 mm, or any value between the two.

[0128] Regarding the positive electrode connection structure 12, after the first protrusion 31 of the positive electrode post 122 is riveted into the first end face 22 of the positive electrode 121, a second protrusion 24 will be formed on the second end face 23 of the positive electrode 121. The distance between the second protrusion 24 of the positive electrode 121 on both sides is set in the range of 0.3 mm to 20 mm.

[0129] Regarding the negative electrode connection structure 13, after the first protrusion 31 of the negative electrode post 131 is riveted into the first end face 22 of the negative electrode cover plate 132, a second protrusion 24 will be formed on the second end face 23 of the negative electrode cover plate 132. The distance between the second protrusion 24 of the negative electrode cover plate 132 and its opposite sides is set in the range of 0.3 mm to 20 mm.

[0130] In some embodiments, the distance between the two sides of the second protrusion 24 of the positive terminal 121 is the same as the distance between the two sides of the second protrusion 24 of the negative terminal cover 132. Alternatively, the distance between the two sides of the second protrusion 24 of the positive terminal 121 is different from the distance between the two sides of the second protrusion 24 of the negative terminal cover 132.

[0131] like Figure 4 and Figure 5 As shown, in some embodiments, the first protrusion 31 is located between the first end face 22 and the second end face 23. The distance between the first protrusion 31 and the second end face 23 is C, and the thickness of the output member 2 is H, satisfying: 0 < C / H ≤ 0.7.

[0132] Understandably, when the first protrusion 31 is located between the first end face 22 and the second end face 23, the first protrusion 31 does not pass through the second end face 23 of the output component 2. At this time, 0 < C / H ≤ 0.7 is set to ensure that the material flow performance meets the design requirements and to prevent the first protrusion 31 from breaking during the riveting process, which could lead to a safety risk to the battery cell.

[0133] In some embodiments, the ratio of the distance between the first protrusion 31 and the second end face 23 to the thickness of the output member 2 is set to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, or any value between the two.

[0134] Regarding the positive electrode connection structure 12, after the first protrusion 31 of the positive electrode post 122 is riveted into the first end face 22 of the positive terminal 121, a second protrusion 24 will be formed on the second end face 23 of the positive terminal 121. The first protrusion 31 of the positive electrode post 122 is located between the first end face 22 and the second end face 23 of the positive terminal 121, and the ratio of the distance between the first protrusion 31 of the positive electrode post 122 and the second end face 23 of the positive terminal 121 to the thickness of the positive terminal 121 is set in the range of 0 to 0.7.

[0135] Regarding the negative electrode connection structure 13, after the first protrusion 31 of the negative electrode post 131 is riveted into the first end face 22 of the negative electrode cover plate 132, a second protrusion 24 will be formed on the second end face 23 of the negative electrode cover plate 132. The first protrusion 31 of the negative electrode post 131 is located between the first end face 22 and the second end face 23 of the negative electrode cover plate 132, and the ratio of the distance between the first protrusion 31 of the negative electrode post 131 and the second end face 23 of the negative electrode cover plate 132 to the thickness of the negative electrode cover plate 132 is set within the range of 0 to 0.7.

[0136] In some embodiments, the ratio of the distance between the first protrusion 31 of the positive electrode post 122 and the second end face 23 of the positive terminal 121 to the thickness of the positive terminal 121 is the same as the ratio of the distance between the first protrusion 31 of the negative electrode post 131 and the second end face 23 of the negative electrode cover plate 132 to the thickness of the negative electrode cover plate 132. Alternatively, the ratio of the distance between the first protrusion 31 of the positive electrode post 122 and the second end face 23 of the positive terminal 121 to the thickness of the positive terminal 121 is different from the ratio of the distance between the first protrusion 31 of the negative electrode post 131 and the second end face 23 of the negative electrode cover plate 132 to the thickness of the negative electrode cover plate 132.

[0137] In some embodiments, the first protrusion 31 protrudes through the second end face 23 and extends into the second protrusion 24. The distance between the first protrusion 31 and the second end face 23 is C, and the thickness of the output member 2 is H, satisfying: 0 < C / H ≤ 1.

[0138] Understandably, when the first protrusion 31 protrudes through the second end face 23 and extends to the second protrusion 24, the first protrusion 31 completely passes through the output member 2, forming a second protrusion 24 with a greater degree of protrusion on the second end face 23 of the output member 2. At this time, 0 < C / H ≤ 1 is ensured to guarantee that the material flow performance meets the design requirements and to prevent the first protrusion 31 from breaking during the riveting process, thus avoiding the risk to the battery cell safety.

[0139] In some embodiments, the ratio of the distance between the first protrusion 31 and the second end face 23 to the thickness of the output member 2 is set to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, or any value between the two.

[0140] Regarding the positive electrode connection structure 12, after the first protrusion 31 of the positive electrode post 122 is riveted into the first end face 22 of the positive terminal 121, a second protrusion 24 will be formed on the second end face 23 of the positive terminal 121. The first protrusion 31 of the positive electrode post 122 is located between the first end face 22 and the second end face 23 of the positive terminal 121, and the ratio of the distance between the first protrusion 31 of the positive electrode post 122 and the second end face 23 of the positive terminal 121 to the thickness of the positive terminal 121 is set within the range of 0 to 1.

[0141] Regarding the negative electrode connection structure 13, after the first protrusion 31 of the negative electrode post 131 is riveted into the first end face 22 of the negative electrode cover plate 132, a second protrusion 24 will be formed on the second end face 23 of the negative electrode cover plate 132. The first protrusion 31 of the negative electrode post 131 is located between the first end face 22 and the second end face 23 of the negative electrode cover plate 132, and the ratio of the distance between the first protrusion 31 of the negative electrode post 131 and the second end face 23 of the negative electrode cover plate 132 to the thickness of the negative electrode cover plate 132 is set within the range of 0 to 1.

[0142] In some embodiments, the ratio of the distance between the first protrusion 31 of the positive electrode post 122 and the second end face 23 of the positive terminal 121 to the thickness of the positive terminal 121 is the same as the ratio of the distance between the first protrusion 31 of the negative electrode post 131 and the second end face 23 of the negative electrode cover plate 132 to the thickness of the negative electrode cover plate 132. Alternatively, the ratio of the distance between the first protrusion 31 of the positive electrode post 122 and the second end face 23 of the positive terminal 121 to the thickness of the positive terminal 121 is different from the ratio of the distance between the first protrusion 31 of the negative electrode post 131 and the second end face 23 of the negative electrode cover plate 132 to the thickness of the negative electrode cover plate 132.

[0143] like Figure 4 and Figure 6 As shown, in some embodiments, the outer peripheral surface of the pole post 3 is provided with a connecting portion 32 that protrudes radially outward. The connecting portion 32 is configured to connect with the welding base plate 15 and / or the pole lug.

[0144] It is understood that the outer circumference of the pole post 3 is constructed with a connecting portion 32 that protrudes radially outward, thereby enabling the pole post 3 to form an electrical connection with the welding base plate 15 and / or the electrode tab. Since the connecting portion 32 protrudes radially outward from the pole post 3, its diameter is larger than that of the pole post 3. When the connecting portion 32 is connected to the welding base plate 15 and / or the electrode tab, it forms a snap-fit ​​structure, allowing the connecting portion 32 to connect and abut against the welding base plate 15 or the negative electrode tab 143, and then the connecting portion 32 is welded to the welding base plate 15 and / or the electrode tab. Based on the snap-fit ​​structure formed by the connecting portion 32, a reliable connection between the connecting portion 32 and the welding base plate 15 and / or the electrode tab is ensured, preventing the pole post 3 from detaching.

[0145] In some embodiments, the electrode tabs include a positive electrode tab 142 and a negative electrode tab 143.

[0146] Regarding the positive electrode connection structure 12, the connection portion 32 is located at the end of the positive electrode post 122 furthest from the positive terminal 121. This connection portion 32 is connected to the welding base plate 15 and forms a stop based on the snap-fit ​​structure to prevent the connection between the positive electrode post 122 and the welding base plate 15 from detaching. The connection portion 32 is welded to and electrically connected to the welding base plate 15. The welding base plate 15 is welded to and electrically connected to the positive electrode tab 142. This causes the positive electrode post 122 and the positive terminal 121 to become positively charged.

[0147] Regarding the negative electrode connection structure 13, the connecting part 32 is disposed at the position of the negative electrode post 131 near the negative electrode cover plate 132, and the connecting part 32 is spaced apart from the first protrusion 31 of the negative electrode post 131. The connecting part 32 is connected to the negative electrode cover plate 132 and forms a stop based on the snap-fit ​​structure to prevent the connection between the negative electrode post 131 and the negative electrode tab 143 from falling off. The connecting part 32 is welded to and electrically connected to the negative electrode tab 143, and the negative electrode cover plate 132 is electrically connected to the housing 11, so that the negative electrode cover plate 132 and the housing 11 are negatively charged.

[0148] In some embodiments, the connecting portion 32 of the positive electrode post 122 and the connecting portion 32 of the negative electrode post 131 have the same shape. Alternatively, the connecting portion 32 of the positive electrode post 122 and the connecting portion 32 of the negative electrode post 131 have different shapes.

[0149] The positive terminal 122 and the negative terminal 131 are formed by the breakage of an integrally formed electrical connector. Two connecting portions 32 are spaced apart on this electrical connector, so that after breakage, a connecting portion 32 can be formed on the positive terminal 122 and also on the negative terminal 131. The connecting portions 32 on the positive terminal 122 and / or the connecting portions 32 on the negative terminal 131 can deform radially outward after the electrical connector breaks, causing the connecting portions 32 to expand outward and form a reverse-clamp structure.

[0150] like Figure 4 and Figure 5 As shown, in some embodiments, the diameter of the pole post 3 is D, and the diameter of the connecting part 32 is E, satisfying: 1 < E / D ≤ 2.5.

[0151] Understandably, by setting the ratio between the diameter of the connecting part 32 and the diameter of the pole post 3 in the range of 1 to 2.5, it is possible to ensure, on the one hand, that the diameter of the connecting part 32 is larger than the diameter of the pole post 3, thereby forming a snap-fit ​​structure so that the connecting part 32 abuts against the welding base plate 15 or the negative electrode tab 143. On the other hand, it can avoid the material cost being too high due to the excessive size of the connecting part 32.

[0152] In some embodiments, the ratio between the diameter of the connecting portion 32 and the diameter of the pole post 3 is set to 1.5, 2.0, 2.5, or any value between the two.

[0153] In some embodiments, the diameter of the pole post 3 is D, and the length of the contact surface between the connecting part 32 and the welding base plate 15 is G, satisfying: 0.05≤G / D≤0.5.

[0154] It is understandable that, for the positive electrode post 122, the ratio of the length of the contact surface between its connecting part 32 and the welding base plate 15 to the diameter of the post 3 is set in the range of 0.05 to 0.5, so as to ensure that there is sufficient flow area between the connecting part 32 and the welding base plate 15, and to prevent the connecting part 32 from being too large and causing excessive material costs.

[0155] In some embodiments, the ratio of the length of the contact surface between the connecting part 32 and the welding base plate 15 to the diameter of the pole post 3 is set to 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, or any value between the two.

[0156] like Figure 6 and Figure 7 As shown, in some embodiments, the thickness of the connecting portion 32 is J, and the thickness of the negative electrode tab 143 is K, satisfying: 0.1≤J / K≤5.

[0157] It is understandable that, for the negative electrode post 131, the connecting part 32 of the negative electrode post 131 needs to be welded to the negative electrode tab 143. Based on setting the ratio of the thickness of the connecting part 32 to the thickness of the negative electrode tab 143 in the range of 0.1 to 5, it is ensured that the connecting part 32 and the negative electrode tab 143 can be welded and fixed by through welding.

[0158] In some embodiments, the ratio of the thickness of the connecting portion 32 to the thickness of the negative electrode tab 143 is set to 0.1, 1, 2, 3, 4, 5, or any value between the two.

[0159] like Figure 2 As shown, in some embodiments, the output component 2 includes a positive terminal 121, the terminal post 3 includes a positive terminal post 122, and the connection portion 32 is configured to be welded to the welding base plate 15. And / or, the output component 2 includes a negative terminal cover 132, the terminal post 3 includes a negative terminal post 131, and the connection portion 32 is configured to be welded to the negative terminal tab 143.

[0160] Understandably, the positive terminal 121 is riveted to the positive terminal post 122, and the connecting portion 32 of the positive terminal post 122 is welded to the welding base plate 15. The welding base plate 15 is welded to the positive electrode tab 142 of the core 14, so that the positive terminal post 122 and the positive terminal 121 can carry a positive charge. The negative terminal post 131 is riveted to the negative electrode cover plate 132, and the connecting portion 32 of the negative terminal post 131 is welded to the negative electrode tab 143 of the core 14, so that the negative electrode cover plate 132 and the housing 11 carry a negative charge.

[0161] like Figure 6 and Figure 7 As shown, in some embodiments, the outer peripheral surface of the negative electrode post 131 is provided with an insulating layer 4.

[0162] It is understandable that the negative terminal 131 is located in the winding channel 141 of the core 14, and an insulating layer 4 is provided on the outer peripheral surface of the negative terminal 131 to achieve insulation between the negative terminal 131 and the core 14, so as to prevent short circuit due to direct contact between the negative terminal 131 and the core 14.

[0163] In some embodiments, the insulating layer 4 covers the outer surface of the negative electrode post 131 from the connection portion 32 to the end near the positive electrode post 122.

[0164] like Figure 6 and Figure 7 As shown, in some embodiments, the thickness of the insulating layer 4 is I, satisfying: 0.002 mm ≤ I ≤ 0.5 mm.

[0165] It is understandable that the thickness of the insulation layer 4 is set to be in the range of 0.002 mm to 0.5 mm to ensure insulation performance and to prevent the insulation layer 4 from being too thick so that the negative electrode post 131 cannot be assembled into the winding channel 141 of the core 14. Furthermore, an excessively thick insulation layer 4 would also increase costs.

[0166] In some embodiments, the thickness of the insulating layer 4 is set to 0.002 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or any value between any two.

[0167] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A connection structure characterized by comprising: include: The output element (2) is configured to output electrical energy to the outside, and the output element (2) has a connecting groove (21); The pole (3) has a first protrusion (31) protruding toward the output member (2), at least a portion of the first protrusion (31) engaging with the connecting groove (21).

2. The connection structure according to claim 1, characterized in that, The first protrusion (31) is riveted to the output component (2).

3. The connection structure according to claim 1, characterized in that, The first protrusion (31) is configured as an annular shape, and along the direction from the pole (3) to the output member (2), the first protrusion (31) is inclined in a direction away from its axis.

4. The connection structure according to any one of claims 1 to 3, characterized in that, The output component (2) has a first end face (22) facing the pole post (3) and a second end face (23) away from the pole post (3). The connecting groove (21) is recessed from the first end face (22) into the output component (2). The second end face (23) is provided with a second protrusion (24), which corresponds to the first protrusion (31).

5. The connection structure according to claim 4, characterized in that, The height of the second protrusion (24) is A, which satisfies: 0 < A ≤ 5 mm.

6. The connection structure according to claim 4, characterized in that, The second protrusion (24) is set as an annular shape, and the distance between the two opposite sides of the second protrusion (24) is B, which satisfies: 0.3 mm ≤ B ≤ 20 mm.

7. The connection structure according to claim 4, characterized in that, The first protrusion (31) is located between the first end face (22) and the second end face (23), the distance between the first protrusion (31) and the second end face (23) is C, and the thickness of the output component (2) is H, satisfying: 0 < C / H ≤ 0.

7.

8. The connection structure according to claim 4, characterized in that, The first protrusion (31) protrudes through the second end face (23) and extends into the second protrusion (24). The distance between the first protrusion (31) and the second end face (23) is C, and the thickness of the output member (2) is H, satisfying: 0 < C / H ≤ 1.

9. The connection structure according to claim 1, characterized in that, The outer peripheral surface of the pole post (3) is provided with a connecting part (32) that protrudes outward in a radial direction. The connecting part (32) is configured to connect with the welding base plate (15) and / or the pole lug.

10. The connection structure according to claim 9, characterized in that, The diameter of the pole (3) is D, and the diameter of the connecting part (32) is E, satisfying: 1 < E / D ≤ 2.

5.

11. The connection structure according to claim 9, characterized in that, The diameter of the pole post (3) is D, and the length of the contact surface between the connecting part (32) and the welding base plate (15) is G, satisfying: 0.05≤G / D≤0.

5.

12. The connection structure according to claim 9, characterized in that, The electrode tab includes a negative electrode tab (143), the thickness of the connecting part (32) is J, and the thickness of the negative electrode tab (143) is K, satisfying: 0.1≤J / K≤5.

13. The connection structure according to any one of claims 9 to 12, characterized in that, The output component (2) includes a positive terminal (121), the terminal (3) includes a positive terminal (122), and the connection part (32) is configured to be welded to the welding base plate (15); And / or, the output component (2) includes a negative electrode cover plate (132), the electrode post (3) includes a negative electrode post (131), the electrode tab includes a negative electrode tab (143), and the connection portion (32) is configured to be welded to the negative electrode tab (143).

14. The connection structure according to claim 13, characterized in that, The outer circumferential surface of the negative electrode post (131) is provided with an insulating layer (4).

15. The connection structure according to claim 14, characterized in that, The thickness of the insulating layer (4) is I, which satisfies: 0.002 mm ≤ I ≤ 0.5 mm.

16. A single-cell battery (1), characterized in that, include: Shell (11); A positive electrode connection structure (12) is connected to one end of the housing (11); The negative electrode connection structure (13) is connected to the other end of the housing (11); Wherein, at least one of the positive electrode connection structure (12) and the negative electrode connection structure (13) adopts the connection structure as described in any one of claims 1 to 15.

17. The single-cell battery (1) according to claim 16, characterized in that, The positive electrode connection structure (12) includes: Positive extreme (121); The positive terminal post (122) is riveted to the positive terminal (121); The positive terminal (121) and / or the positive terminal post (122) are connected to one end of the housing (11).

18. The single-cell battery (1) according to claim 17, characterized in that, The single cell (1) further includes a core (14), which is disposed inside the housing (11), wherein a winding channel (141) is formed inside the core (14); The negative electrode connection structure (13) includes: The negative electrode cover plate (132) is connected to the other end of the housing (11); The negative electrode post (131) is disposed in the winding channel (141). One end of the negative electrode post (131) extends out of the winding channel (141) and is riveted to the negative electrode cover plate (132). The other end of the negative electrode post (131) is spaced apart from the positive electrode post (122).

19. The single-cell battery (1) according to claim 18, characterized in that, The distance between the negative electrode post (131) and the positive electrode post (122) is F, which satisfies: F≥0.1 mm.

20. The single-cell battery (1) according to claim 18, characterized in that, The core (14) has a positive electrode tab (142) and a negative electrode tab (143) connected to its opposite ends respectively. The positive electrode tab (142) is electrically connected to the positive electrode post (122), and the negative electrode tab (143) is electrically connected to the negative electrode post (131).

21. A battery pack, characterized in that, Includes the single cell (1) as described in any one of claims 16 to 20.

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