Electrical connector, single cell and battery pack

Abstract

The utility model relates to battery technical field provides a kind of electric connector, single battery and battery package.The electric connector includes the first connecting section, main body section, deformation section and second connecting section connected in turn.The first connecting section is configured as connecting negative cover plate.The second connecting section is configured as connecting positive terminal.The deformation section is configured as breaking under external force, to make the first connecting section and the second connecting section interval arrangement.Thereby, the original positive pole and negative pole are replaced by the electric connector of integrated structure, so as to realize that electric connector integrated installation in single battery, to reduce the number of parts, reduce cost.

Description

Technical Field

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

[0002] In related technologies, the positive terminal on the positive side and the negative terminal on the negative side of a single battery cell are separate structures, which need to be installed separately in the housing, resulting in a large number of parts and high costs. Utility Model Content

[0003] The embodiments of this utility model provide an electrical connector, a single battery cell, and a battery pack, which can improve the technical problem of a large number of installation structure components caused by separate installation of the positive and negative terminals.

[0004] In a first aspect, embodiments of the present invention provide an electrical connector, comprising a first connecting segment, a main body segment, a deformation segment, and a second connecting segment connected in sequence. The first connecting segment is configured to connect to a negative electrode cover plate, the second connecting segment is configured to connect to a positive electrode terminal, and the deformation segment is configured to break under external force, so that the first connecting segment and the second connecting segment are spaced apart.

[0005] Therefore, an integrated electrical connector replaces the original positive and negative terminals, allowing it to be installed as a single unit within the battery cell, thereby reducing the number of components and lowering costs.

[0006] In one embodiment, the end of the first connecting segment away from the main body segment is connected to a first protrusion, the first protrusion being configured to be riveted to the negative electrode cover plate.

[0007] This improves the reliability of the connection between the first connecting section and the negative electrode cover, and reduces the possibility of cell safety accidents.

[0008] In one embodiment, the first protrusion is configured as annular, and the inner peripheral surface of the first protrusion is inclined away from its axis along the direction from the main body segment to the first connecting segment.

[0009] Therefore, after the first protrusion is riveted to the negative electrode cover plate, it can form a mechanical interlock structure with the negative electrode cover plate and increase the area for current to pass through, thus avoiding high-temperature failure.

[0010] In one embodiment, the width of the first protrusion on the side away from the first connecting segment is a1, and the width on the side closer to the first connecting segment is b1, satisfying: 0 < a1 / b1 ≤ 1.

[0011] Therefore, when the first protrusion is riveted to the negative electrode cover plate, the material of the negative electrode cover plate can be more easily pushed by the first protrusion, which facilitates the material flow of the negative electrode cover plate.

[0012] In one embodiment, the main body segment has a folding member connected to its outer peripheral surface near one end of the first connecting segment. The folding member is configured to unfold under external force and is welded to the negative electrode tab.

[0013] This achieves both mechanical and electrical connection between the main body section and the negative electrode tab.

[0014] In one embodiment, the folding member has a first state and a second state. In the first state, the folding member is arranged around the outside of the first connecting segment. In the second state, the folding member is angled to the main body segment. The folding member is configured to switch from the first state to the second state under the action of an external force.

[0015] This allows for the switching of the folded component's state, enabling it to unfold and weld to the negative electrode tab. The unfolded folded component has sufficient welding area with the negative electrode tab, ensuring a reliable connection between them.

[0016] In one embodiment, in the first state, the distance between the folding member and the end of the first connecting segment away from the main body segment is c, which satisfies: c ≥ 0.1 mm.

[0017] This prevents the folded parts from interfering with the riveting between the first connecting section and the negative electrode cover.

[0018] In one embodiment, the diameter of the main body segment is d, and in the first state, the outer diameter of the folding member is e, satisfying: 1 < e / d ≤ 1.5.

[0019] This prevents the outer diameter of the folding component from being too large, which would prevent the electrical connector from being assembled into the winding channel of the core.

[0020] In one embodiment, in the first state, the connection surface between the folding member and the main body segment is set as an arc-shaped surface, and the arc-shaped surface is bent in a direction away from the first connection segment.

[0021] This facilitates the bending and deformation of folding components.

[0022] In one embodiment, along the first direction, the width of the folded member at a position away from the arcuate surface is g, and the minimum width at the position of the arcuate surface is f, satisfying: f < g.

[0023] This facilitates the bending and deformation of folding components.

[0024] In one embodiment, along the second direction, the minimum thickness of the folded member at the arcuate surface position is h, satisfying: 0.3g≤h, wherein the second direction is set at an angle to the first direction.

[0025] This facilitates the bending and deformation of the folding parts and prevents them from breaking.

[0026] In one embodiment, the diameter of the deformable segment is smaller than the diameter of the main body segment, and the diameter of the deformable segment is smaller than the diameter of the second connecting segment.

[0027] Therefore, when an electrical connector is subjected to external force, the deformed section is the area most prone to fracture.

[0028] In one embodiment, the diameter of the main body segment is d, and the diameter of the deformed segment is i, satisfying: 0.3≤i / d≤0.8.

[0029] This ensures that when the electrical connector is subjected to external force, the deformation section breaks, while the main body section, the first connecting section, and the second connecting section do not break due to the external force.

[0030] In one embodiment, a second protrusion is connected to the end of the second connecting segment away from the deformed segment, and the second protrusion is configured to be riveted to the positive terminal.

[0031] This improves the reliability of the connection between the second connection section and the positive terminal, and reduces the possibility of cell safety accidents.

[0032] In one embodiment, the second protrusion is configured as annular, and the inner peripheral surface of the second protrusion is inclined away from its axis along the direction from the main body segment to the second connecting segment.

[0033] Therefore, after the second protrusion is riveted to the positive terminal, it can form a mechanical interlock structure with the positive terminal and increase the area for current to pass through, thus avoiding high-temperature failure.

[0034] In one embodiment, the width of the second protrusion on the side away from the second connecting segment is a2, and the width on the side closer to the second connecting segment is b2, satisfying: 0 < a2 / b2 ≤ 1.

[0035] Therefore, when the second protrusion is riveted to the positive terminal, the material of the positive terminal can be more easily pushed by the second protrusion, which facilitates the flow of material in the positive terminal.

[0036] In one embodiment, the outer peripheral surface of the second connecting segment is provided with a connecting portion that protrudes radially outward, the connecting portion being configured to connect with a welding base plate.

[0037] This allows the second connecting section and the positive terminal to be positively charged.

[0038] In one embodiment, the diameter of the main body segment is d, and the outer diameter of the connecting part is j, satisfying: 1.05≤j / d≤1.5.

[0039] Therefore, it is ensured that the outer diameter of the connecting part is larger than the diameter of the main body section, so that the connecting part can form a reverse interlocking structure. This also prevents the connecting part from being too wide, which would prevent the electrical connectors from being assembled into the winding core.

[0040] In one embodiment, along the direction from the second connecting segment to the main body segment, the outer peripheral surface of the connecting portion is inclined in a direction away from its axis, wherein the inclination angle of the outer peripheral surface of the connecting portion is α, satisfying: 20°≤α≤70°.

[0041] This prevents the connection between the second connecting section and the welding base plate from falling off, and facilitates the application of external forces to the electrical connector to break the deformed section.

[0042] In one embodiment, the outer peripheral surface of the main body segment is provided with an insulating layer.

[0043] This achieves insulation between the main body section and the core.

[0044] In one embodiment, the thickness of the insulating layer is m, satisfying: 0.002 mm ≤ m ≤ 0.5 mm.

[0045] This ensures insulation performance and prevents situations where excessive costs or the inability to assemble the core within the winding channel occur.

[0046] This application embodiment also provides a single battery cell, including a positive terminal, a negative terminal cover, and an electrical connector as described above. The first connecting segment is connected to the negative terminal cover, and the second connecting segment is connected to the positive terminal. The deformed segment is in a broken state so that the first connecting segment and the second connecting segment are spaced apart.

[0047] This application also provides a battery pack, including the single battery cells as described above.

[0048] The beneficial effects of the embodiments of this utility model are as follows:

[0049] In an embodiment of this invention, the deformation section of the electrical connector breaks under the action of an external force, so that the first connecting section and the second connecting section are spaced apart. Since the first connecting section is configured to connect to the negative electrode cover and the second connecting section is configured to connect to the positive electrode, the first connecting section and the main body section can jointly serve as the negative electrode post, and the second connecting section can serve as the positive electrode post. Thus, by replacing the original positive and negative electrode posts with an integrated electrical connector, the electrical connector is integrated into the single battery cell, thereby reducing the number of parts and lowering costs. Attached Figure Description

[0050] 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.

[0051] Figure 1 This is a schematic diagram of the structure of the electrical connector provided in an embodiment of this utility model;

[0052] Figure 2 This is a cross-sectional view of the electrical connector provided in an embodiment of this utility model;

[0053] Figure 3 This is a cross-sectional view of the electrical connector provided in an embodiment of the present invention when the folded part is in the first state and the deformed section is not broken;

[0054] Figure 4 This is a cross-sectional view of the electrical connector provided in an embodiment of the present invention after the folded part is in the second state and the deformed section is broken.

[0055] Figure 5 This is a cross-sectional view of the first connecting segment provided in an embodiment of this utility model;

[0056] Figure 6 yes Figure 5 A magnified view of a section at point A in the middle;

[0057] Figure 7 This is a cross-sectional view of the second connecting segment provided in an embodiment of this utility model;

[0058] Figure 8 This is a partial sectional view of the main body segment provided in an embodiment of this utility model.

[0059] Explanation of reference numerals in the attached figures:

[0060] 1. First connecting segment; 11. First protrusion;

[0061] 2. Main body section; 21. Folding component; 22. Curved surface; 23. Insulation layer;

[0062] 3. Deformation segment;

[0063] 4. Second connecting section; 41. Second protrusion; 42. Connecting part. Detailed Implementation

[0064] 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.

[0065] 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. The battery box provides a space for accommodating the individual battery cells, 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. 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.

[0066] In a battery pack, there can be multiple individual cells. These cells can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple cells are connected in both series and parallel configurations. Multiple cells can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of these cells is housed within a battery box. Alternatively, the battery pack can consist of multiple individual cells first connected in series, parallel, or a combination thereof to form battery modules, and then these modules are connected in series, parallel, or a combination thereof to form a single unit housed within a battery box. The battery pack may also include other structures; for example, it may include a busbar for electrical connection between the multiple individual cells.

[0067] Each individual cell 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. Individual cells can be cylindrical, flat, cuboid, or other shapes.

[0068] This application also provides a single-cell battery. The single-cell battery includes a housing, a positive terminal, a negative terminal cover, and electrode assemblies, electrical connectors, and other functional components located within the housing. The electrical connectors include a first connecting segment 1, a main body segment 2, a deformation segment 3, and a second connecting segment 4 connected sequentially. The first connecting segment 1 is connected to the negative terminal cover. The second connecting segment 4 is connected to the positive terminal. The deformation segment 3 is in a broken state, allowing the first connecting segment 1 and the second connecting segment 4 to be spaced apart.

[0069] Understandably, the deformation segment 3 of the electrical connector breaks under external force, causing the first connecting segment 1 and the second connecting segment 4 to be spaced apart. Since the first connecting segment 1 is configured to connect to the negative terminal cover, and the second connecting segment 4 is configured to connect to the positive terminal, the first connecting segment 1 and the main body segment 2 can together serve as the negative terminal post, and the second connecting segment 4 can serve as the positive terminal post. Thus, by replacing the original positive and negative terminals with an integrated electrical connector, the electrical connector is integrated into the single battery cell, reducing the number of components and lowering costs.

[0070] like Figures 1 to 8 As shown in the figure, this application embodiment provides an electrical connector. The electrical connector includes a first connecting segment 1, a main body segment 2, a deformation segment 3, and a second connecting segment 4 connected in sequence. The first connecting segment 1 is configured to connect to a negative electrode cover. The second connecting segment 4 is configured to connect to a positive electrode. The deformation segment 3 is configured to break under external force, so that the first connecting segment 1 and the second connecting segment 4 are spaced apart.

[0071] In this embodiment, the deformation segment 3 of the electrical connector breaks under the action of an external force, so that the first connecting segment 1 and the second connecting segment 4 are spaced apart. Since the first connecting segment 1 is configured to connect to the negative electrode cover and the second connecting segment 4 is configured to connect to the positive electrode, the first connecting segment 1 and the main body segment 2 can jointly serve as the negative electrode post, and the second connecting segment 4 can serve as the positive electrode post. Thus, by replacing the original positive and negative electrode posts with an integrated electrical connector, the electrical connector is integrated into the single battery cell, thereby reducing the number of parts and lowering costs.

[0072] It is understandable that the first connecting segment 1, the main body segment 2, the deformation segment 3, and the second connecting segment 4 are integrally molded to form a one-piece electrical connector structure. When the electrical connector is applied to a single battery cell, the end of the first connecting segment 1 furthest from the main body segment 2 is connected to the negative electrode cover, and the end of the second connecting segment 4 furthest from the deformation segment 3 is connected to the positive terminal. Under the action of external riveting force, the deformation segment 3 breaks, so that the first connecting segment 1 and the second connecting segment 4 are spaced apart to ensure insulation between the positive and negative electrodes.

[0073] In some embodiments, after the deformed segment 3 breaks, the distance between the first connecting segment 1 and the second connecting segment 4 is greater than or equal to 0.1 mm. This ensures sufficient insulation width between the first connecting segment 1 (negative terminal) and the second connecting segment 4 (positive terminal), preventing short circuits due to insufficient creepage distance. In some embodiments, the distance between the first connecting segment 1 and the second connecting segment 4 can be set to 0.1 mm, 0.5 mm, 1 mm, or any value in between. The distance between the first connecting segment 1 and the second connecting segment 4 can be reasonably selected based on the height of the individual battery cell.

[0074] like Figure 1 As shown, in some embodiments, the end of the first connecting segment 1 away from the main body segment 2 is connected to a first protrusion 11. The first protrusion 11 is configured to be riveted to the negative electrode cover plate.

[0075] Understandably, the first connecting segment 1 is riveted to the negative electrode cover plate via the first protrusion 11, thereby replacing the traditional connection method where the negative electrode post and the negative electrode cover plate are fixed by welding. This avoids the increase in resistance or decrease in mechanical strength at the connection point caused by welding. As a result, the connection reliability between the first connecting segment 1 and the negative electrode cover plate can be improved, and the possibility of cell safety accidents can be reduced.

[0076] The first connecting segment 1 is riveted to the negative electrode cover plate via the first protrusion 11, which also forms a mechanical interlocking structure between the first connecting segment 1 and the negative electrode cover plate, eliminating the need for welding or chemical bonding to connect them. This avoids affecting the strength between the first connecting segment 1 and the negative electrode cover plate due to welding, ensuring the safety of the individual battery cell.

[0077] The first connecting segment 1 is riveted to the negative electrode cover plate through the first protrusion 11. The first connecting segment 1 and the negative electrode cover plate can also be connected by plastic deformation, and the contact area between the first connecting segment 1 and the negative electrode cover plate is increased, which can reduce the contact resistance.

[0078] like Figure 1 and Figure 2As shown, in some embodiments, the first protrusion 11 is configured as an annular shape. Furthermore, along the direction from the main body segment 2 to the first connecting segment 1, the inner peripheral surface of the first protrusion 11 is inclined in a direction away from its axis.

[0079] Understandably, after the first protrusion 11 is embedded in the negative electrode cover plate, a first connecting groove can be formed on the first side of the negative electrode cover plate, and a first protrusion structure can be formed on the second side of the negative electrode cover plate. The first protrusion 11 is an annular boss structure, and its inner circumferential surface is inclined, so that after the first protrusion 11 is riveted to the negative electrode cover plate, it can form a mechanical interlock structure with the negative electrode cover plate, and can increase the area for current to pass through, thus avoiding high-temperature failure.

[0080] By setting the first protrusion 11 as an annular shape, after the first protrusion 11 is riveted to the negative electrode cover plate, the internal material of the negative electrode cover plate can be pushed to both sides, so that the negative electrode cover plate can be deformed to both sides.

[0081] In some embodiments, the first protrusion 11 is configured as an annular shape.

[0082] In some embodiments, the first protrusion 11 may also be configured in other shapes. For example, the first protrusion 11 may be configured in other shapes such as hemispherical, rhomboid, or frustum, to ensure that the first protrusion 11 can be riveted into the negative electrode cover plate and that the first connecting section 1 and the negative electrode cover plate can form a mechanical interlocking structure.

[0083] like Figure 5 As shown, in some embodiments, the width of the first protrusion 11 on the side away from the first connecting segment 1 is a1, and the width on the side closer to the first connecting segment 1 is b1, satisfying: 0 < a1 / b1 ≤ 1.

[0084] Understandably, since the ratio of the width of the first protrusion 11 on the side away from the first connecting segment 1 to the width of the first protrusion 11 on the side close to the first connecting segment 1 is set within the range of 0 to 1, the first protrusion 11 can be configured as a trapezoid or a rectangle. When the first protrusion 11 is configured as a trapezoid, 0 < a1 / b1 < 1. When the first protrusion 11 is configured as a rectangle, a1 / b1 = 1. Based on the above structural configuration of the first protrusion 11, when the first protrusion 11 is riveted to the negative electrode cover plate, the material of the negative electrode cover plate can be more easily pushed by the first protrusion 11, facilitating the material flow of the negative electrode cover plate.

[0085] In some embodiments, the ratio of the width of the first protrusion 11 on the side away from the first connecting segment 1 to the width of the first protrusion 11 on the side close to the first connecting segment 1 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.

[0086] like Figure 2 As shown, in some embodiments, the main body segment 2 has a folding member 21 connected to its outer peripheral surface near one end of the first connecting segment 1. The folding member 21 is configured to unfold under external force and be welded to the negative electrode tab.

[0087] Understandably, the main body segment 2 has a folding member 21 on its outer peripheral surface near the first connecting segment 1. The folding member 21 can be unfolded under external force, and the unfolded folding member 21 can abut against and weld with the negative electrode tab. Thus, the mechanical and electrical connection between the main body segment 2 and the negative electrode tab is achieved.

[0088] Since the main body segment 2 and the first connecting segment 1 together serve as the negative electrode post, after the main body segment 2 is welded to the negative electrode tab through the folding piece 21, the mechanical connection and electrical connection between the negative electrode post and the negative electrode tab can be realized, so as to ensure that the negative electrode cover plate can carry a negative charge.

[0089] like Figure 3 and Figure 4 As shown, in some embodiments, the folding member 21 has a first state and a second state. In the first state, the folding member 21 is arranged around the outside of the first connecting segment 1. In the second state, the folding member 21 is angled relative to the main body segment 2. The folding member 21 is configured to switch from the first state to the second state under the action of an external force.

[0090] Understandably, when the electrical connector is not assembled to a single battery cell, and when the electrical connector is assembled to a single battery cell and the deformation segment 3 has not yet broken, the folding member 21 is in the first state. When the electrical connector is assembled to a single battery cell and the deformation segment 3 breaks, the folding member 21 switches from the first state to the second state under the action of external force. Based on the action of external force, the state switching of the folding member 21 is realized, so that the folding member 21 can be unfolded and welded to the negative electrode tab. The unfolded folding member 21 and the negative electrode tab have sufficient welding area to ensure a reliable connection between the folding member 21 and the negative electrode tab.

[0091] In the first state, the folding member 21 is arranged around the outside of the first connecting section 1, and the folding member 21 is spaced apart from the first connecting section 1. Under the action of external force, the folding member 21 deforms and unfolds in the direction closer to the main body section 2. The unfolded folding member 21 can also serve as a limiting structure. Specifically, the unfolded folding member 21 abuts against the negative electrode tab, thereby preventing the first connecting section 1 from passing through the winding channel of the core.

[0092] like Figure 5 As shown, in some embodiments, in the first state, the distance between the folding member 21 and the end of the first connecting segment 1 away from the main body segment 2 is c, which satisfies: c≥0.1 mm.

[0093] Understandably, in the first state, the distance between the folding piece 21 and the end of the first connecting segment 1 away from the main body segment 2 is greater than or equal to 0.1 mm, so as to prevent the folding piece 21 from interfering with the riveting of the first connecting segment 1 and the negative electrode cover plate.

[0094] In some embodiments, the distance between the folding member 21 and the end of the first connecting segment 1 furthest from the main body segment 2 is set to 0.1 mm, 0.5 mm, 1 mm, or any value between the two. The distance between the folding member 21 and the end of the first connecting segment 1 furthest from the main body segment 2 can also be reasonably selected based on the height of the individual battery cell.

[0095] like Figure 5 As shown, in some embodiments, the diameter of the main body segment 2 is d, and in the first state, the outer diameter of the folding member 21 is e, satisfying: 1 < e / d ≤ 1.5.

[0096] Understandably, the electrical connector will be assembled into the winding channel of the core when the folding member 21 is in the first state. In the first state, the ratio of the outer diameter of the folding member 21 to the diameter of the main body segment 2 is set in the range of 1 to 1.5 to prevent the outer diameter of the folding member 21 from being too large, which would prevent the electrical connector from being assembled into the winding channel of the core.

[0097] In some embodiments, the ratio of the outer diameter of the folding member 21 to the diameter of the main body segment 2 is set to 1.1, 1.2, 1.3, 1.4, 1.5, or any value between the two.

[0098] like Figure 6 As shown, in some embodiments, in the first state, the connection surface between the folding member 21 and the main body segment 2 is set as an arc-shaped surface 22, and the arc-shaped surface 22 is bent in a direction away from the first connecting segment 1.

[0099] It is understandable that the connection between the folding member 21 and the main body segment 2 is set as an arc-shaped surface 22, and the arc-shaped surface 22 is bent in a direction away from the first connecting segment 1, so as to facilitate the folding deformation of the folding member 21. That is, the folding member 21 can use the arc-shaped surface 22 as the folding position, and the arc-shaped surface 22 can form a curved transition notch, thereby facilitating the bending deformation of the folding member 21.

[0100] like Figure 6 As shown, in some embodiments, along the first direction, the width of the folding member 21 at a position away from the arcuate surface 22 is g, and the minimum width at the position of the arcuate surface 22 is f, satisfying: f < g.

[0101] It is understandable that, since the folding member 21 will fold and deform along the arc surface 22 to switch from the first state to the second state, the width of the folding member 21 away from the arc surface 22 is greater than the minimum width of the folding member 21 at the arc surface 22, which facilitates the bending and deformation of the folding member 21.

[0102] like Figure 6 As shown, in some embodiments, along the second direction, the minimum thickness of the folding member 21 at the position of the arc surface 22 is h, which satisfies: 0.3g≤h, wherein the second direction is set at an angle to the first direction.

[0103] It is understandable that, since the folding member 21 will fold and deform along the arc surface 22 to switch from the first state to the second state, if the minimum thickness of the folding member 21 at the arc surface 22 is greater than or equal to 0.3 times the width of the folding member 21 at the position away from the arc surface 22, it can facilitate the bending and deformation of the folding member 21 and prevent the folding member 21 from being broken.

[0104] In some embodiments, the minimum thickness of the folding member 21 at the position of the arcuate surface 22 is equal to 0.3 times the width of the folding member 21 at the position away from the arcuate surface 22.

[0105] In some embodiments, the second direction is set at an acute angle to the first direction. Alternatively, the second direction is set at an obtuse angle to the first direction. Alternatively, the second direction is set at a right angle to the first direction.

[0106] like Figure 2 and Figure 3 As shown, in some embodiments, the diameter of the deformable segment 3 is smaller than the diameter of the main body segment 2, and the diameter of the deformable segment 3 is smaller than the diameter of the second connecting segment 4.

[0107] It is understandable that the deformation segment 3 connects the main body segment 2 and the second connecting segment 4, making the diameter of the deformation segment 3 smaller than the diameter of the main body segment 2 and smaller than the diameter of the second connecting segment 4. When the electrical connector is subjected to external force, the deformation segment 3 is the area most prone to fracture. Therefore, when the electrical connector is subjected to external force, the deformation segment 3 fractures, while the main body segment 2, the first connecting segment 1, and the second connecting segment 4 do not fracture due to the external force.

[0108] Specifically, when the electrical connector is subjected to an external riveting force on one side of the second connecting section 4, the riveting force can break the deformed section 3, thereby making the second connecting section 4 a positive pole and the main body section 2 and the first connecting section 1 a negative pole.

[0109] In some embodiments, the diameters of the first connecting segment 1, the main body segment 2, and the second connecting segment 4 are the same. Alternatively, the diameters of the first connecting segment 1, the main body segment 2, and the second connecting segment 4 are different, provided that the diameters of the first connecting segment 1, the main body segment 2, and the second connecting segment 4 are greater than the diameter of the deformable segment 3.

[0110] like Figure 7 As shown, in some embodiments, the diameter of the main body segment 2 is d, and the diameter of the deformed segment 3 is i, satisfying: 0.3≤i / d≤0.8.

[0111] Understandably, the ratio between the diameter of the deformable segment 3 and the diameter of the main body segment 2 is set in the range of 0.3 to 0.8 to ensure that the diameter of the deformable segment 3 is smaller than the diameter of the main body segment 2. When the electrical connector is subjected to an external force, the deformable segment 3 breaks, while the main body segment 2, the first connecting segment 1, and the second connecting segment 4 do not break due to the external force.

[0112] If the diameter ratio of the deformable segment 3 to the main body segment 2 is less than 0.3, then the diameter of the deformable segment 3 is too small, and its strength cannot meet the assembly requirements. If the diameter ratio of the deformable segment 3 to the main body segment 2 is greater than 0.8, then the diameter of the deformable segment 3 is too large, and its strength is too great. When the electrical connector is subjected to external forces, the deformable segment 3 will not easily break.

[0113] In some embodiments, the diameter ratio of the deformed segment 3 to the main body segment 2 is set to 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or any value between the two.

[0114] In some embodiments, the end of the second connecting segment 4 away from the deformed segment 3 is connected to a second protrusion 41, which is configured to be riveted to the positive terminal.

[0115] Understandably, the second connecting segment 4 is riveted to the positive terminal via the second protrusion 41, thus replacing the traditional method of fixing the positive terminal and positive terminal by welding. This avoids the increase in resistance or decrease in mechanical strength at the connection point caused by welding. Therefore, the connection reliability between the second connecting segment 4 and the positive terminal can be improved, and the possibility of cell safety accidents can be reduced.

[0116] The second connecting segment 4 is riveted to the positive terminal via the second protrusion 41, which also forms a mechanical interlocking structure between the second connecting segment 4 and the positive terminal, eliminating the need for welding or chemical bonding to achieve the connection. This avoids affecting the strength between the second connecting segment 4 and the positive terminal due to welding, ensuring the safety of the individual battery cell.

[0117] The second connecting segment 4 is riveted to the positive terminal through the second protrusion 41. The second connecting segment 4 and the positive terminal can also be connected by plastic deformation, and the contact area between the second connecting segment 4 and the positive terminal is increased, which can reduce the contact resistance.

[0118] like Figure 2 and Figure 3 As shown, in some embodiments, the second protrusion 41 is configured as annular, and the inner circumferential surface of the second protrusion 41 is inclined away from its axis along the direction from the main body segment 2 to the second connecting segment 4.

[0119] Understandably, after the second protrusion 41 is embedded in the positive terminal, a second connecting groove can be formed on the first side of the positive terminal, and a second protrusion structure can be formed on the second side of the positive terminal. The second protrusion 41 is an annular boss structure, and its inner circumferential surface is inclined, so that after the second protrusion 41 is riveted to the positive terminal, it can form a mechanical interlock structure with the positive terminal, and can increase the area for current to pass through, thus avoiding high-temperature failure.

[0120] By setting the second protrusion 41 as an annular shape, after the second protrusion 41 is riveted to the positive terminal, the internal material of the positive terminal can be pushed to both sides, so that the positive terminal can be deformed to both sides.

[0121] In some embodiments, the second protrusion 41 is configured as an annular shape.

[0122] In some embodiments, the second protrusion 41 may also be configured in other shapes. For example, the second protrusion 41 may be configured in other shapes such as hemispherical, rhomboid, or frustum, to ensure that the second protrusion 41 can be riveted into the positive terminal and that the second connecting segment 4 and the positive terminal can form a mechanical interlocking structure.

[0123] like Figure 7 As shown, in some embodiments, the width of the second protrusion 41 on the side away from the second connecting segment 4 is a2, and the width on the side closer to the second connecting segment 4 is b2, satisfying: 0 < a2 / b2 ≤ 1.

[0124] Understandably, since the ratio of the width of the second protrusion 41 on the side away from the second connecting segment 4 to the width of the second protrusion 41 on the side closer to the second connecting segment 4 is set in the range of 0 to 1, the second protrusion 41 can be configured as a trapezoid or a rectangle. When the second protrusion 41 is configured as a trapezoid, 0 < a² / b² < 1. When the second protrusion 41 is configured as a rectangle, a² / b² = 1. Based on the above structural configuration of the second protrusion 41, when the second protrusion 41 is riveted to the positive terminal, the material of the positive terminal can be more easily pushed by the second protrusion 41, facilitating the material flow of the positive terminal.

[0125] In some embodiments, the ratio of the width of the second protrusion 41 on the side away from the second connecting segment 4 to the width of the second protrusion 41 on the side close to the second connecting segment 4 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.

[0126] like Figure 2 As shown, in some embodiments, the outer peripheral surface of the second connecting segment 4 is provided with a connecting portion 42 that protrudes radially outward, and the connecting portion 42 is configured to connect with the welding base plate.

[0127] Understandably, the connecting part 42 is constructed on the outer peripheral surface of the second connecting section 4 near the deformed section 3. The connecting part 42 is configured to be welded to the welding base plate, and the welding base plate is welded to the positive electrode tab of the core, thereby enabling the second connecting section 4 and the positive terminal to be positively charged.

[0128] The connecting part 42 can also serve as a reverse-clamping structure to prevent the connection between the second connecting section 4 and the welding base plate from falling off. Furthermore, the reverse-clamping structure formed by the connecting part 42 can flow to both sides when the deformed section 3 breaks, so as to facilitate the mutual fixation between the second connecting section 4 and the positive electrode side of the single cell.

[0129] like Figure 7 As shown, in some embodiments, the diameter of the main body segment 2 is d, and the outer diameter of the connecting part 42 is j, satisfying: 1.05≤j / d≤1.5.

[0130] Understandably, the ratio of the outer diameter of the connecting part 42 to the diameter of the main body section 2 is set in the range of 1.05 to 1.5 to ensure that the outer diameter of the connecting part 42 is larger than the diameter of the main body section 2, so that the connecting part 42 can form a reverse snap structure. This also prevents the connecting part 42 from being too wide, which would prevent the electrical connector from being assembled into the winding core.

[0131] like Figure 7 As shown, in some embodiments, along the direction from the second connecting segment 4 to the main body segment 2, the outer peripheral surface of the connecting portion 42 is inclined in a direction away from its axis, wherein the inclination angle of the outer peripheral surface of the connecting portion 42 is α, which satisfies: 20°≤α≤70°.

[0132] It is understandable that the outer peripheral surface of the connecting part 42 is tilted away from its axis along the direction from the second connecting section 4 to the main body section 2, so that the connecting part 42 can form a reverse buckle structure. On the one hand, this can prevent the connection between the second connecting section 4 and the welding base plate from falling off, and on the other hand, it can facilitate the application of external force to the electrical connector to break the deformation section 3.

[0133] In some embodiments, the inclination angle of the outer peripheral surface of the connecting portion 42 is set to 20°, 30°, 40°, 50°, 60°, 70°, or any value between the two.

[0134] like Figure 8 As shown, in some embodiments, the outer peripheral surface of the main body segment 2 is provided with an insulating layer 23.

[0135] Understandably, when electrical connectors are applied to a single battery cell, the main body segment 2 is located within the winding channel of the core. An insulating layer 23 is provided on the outer circumferential surface of the main body segment 2 to achieve insulation between the main body segment 2 and the core, preventing short circuits caused by direct contact between the main body segment 2 and the core.

[0136] In some embodiments, the insulating layer 23 covers the outer surface of all exposed areas of the body segment 2.

[0137] like Figure 8 As shown, in some embodiments, the thickness of the insulating layer 23 is m, satisfying: 0.002 mm ≤ m ≤ 0.5 mm.

[0138] It is understandable that the thickness of the insulation layer 23 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 23 from being too thick, which would prevent the main body segment 2 from being assembled into the winding channel of the core. In addition, an excessively thick insulation layer 23 would also increase costs.

[0139] In some embodiments, the thickness of the insulating layer 23 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 the two.

[0140] 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. An electrical connector, characterized in that, It includes a first connecting segment (1), a main body segment (2), a deformation segment (3) and a second connecting segment (4) connected in sequence. The first connecting segment (1) is configured to connect to the negative electrode cover plate, and the second connecting segment (4) is configured to connect to the positive electrode terminal. The deformation segment (3) is configured to break under the action of external force so that the first connecting segment (1) and the second connecting segment (4) are spaced apart.

2. The electrical connector according to claim 1, characterized in that, The first connecting segment (1) is connected to a first protrusion (11) at one end away from the main body segment (2), and the first protrusion (11) is configured to be riveted to the negative electrode cover plate.

3. The electrical connector according to claim 2, characterized in that, The first protrusion (11) is configured as an annular shape, and the inner circumferential surface of the first protrusion (11) is inclined away from its axis along the direction from the main body segment (2) to the first connecting segment (1).

4. The electrical connector according to claim 2, characterized in that, The width of the first protrusion (11) on the side away from the first connecting segment (1) is a1, and the width on the side closer to the first connecting segment (1) is b1, satisfying: 0 < a1 / b1 ≤ 1.

5. The electrical connector according to any one of claims 1 to 4, characterized in that, The main body segment (2) has a folding member (21) connected to the outer peripheral surface near the first connecting segment (1). The folding member (21) is configured to unfold under external force and be welded to the negative electrode tab.

6. The electrical connector according to claim 5, characterized in that, The folding member (21) has a first state and a second state. In the first state, the folding member (21) is arranged around the outside of the first connecting segment (1). In the second state, the folding member (21) is set at an angle to the main body segment (2). The folding member (21) is configured to switch from the first state to the second state under the action of an external force.

7. The electrical connector according to claim 6, characterized in that, In the first state, the distance between the folding member (21) and the end of the first connecting segment (1) away from the main body segment (2) is c, which satisfies: c≥0.1 mm.

8. The electrical connector according to claim 6, characterized in that, The diameter of the main body segment (2) is d, and in the first state, the outer diameter of the folding member (21) is e, satisfying: 1 < e / d ≤ 1.

5.

9. The electrical connector according to claim 6, characterized in that, In the first state, the connection surface between the folding member (21) and the main body segment (2) is set as an arc-shaped surface (22), and the arc-shaped surface (22) is bent in a direction away from the first connecting segment (1).

10. The electrical connector according to claim 9, characterized in that, Along the first direction, the width of the folding member (21) at a position away from the arcuate surface (22) is g, and the minimum width at the position of the arcuate surface (22) is f, satisfying: f < g.

11. The electrical connector according to claim 10, characterized in that, Along the second direction, the minimum thickness of the folding member (21) at the position of the arc surface (22) is h, which satisfies: 0.3g≤h, wherein the second direction is set at an angle to the first direction.

12. The electrical connector according to any one of claims 1 to 4, characterized in that, The diameter of the deformable segment (3) is smaller than the diameter of the main body segment (2), and the diameter of the deformable segment (3) is smaller than the diameter of the second connecting segment (4).

13. The electrical connector according to claim 12, characterized in that, The diameter of the main body segment (2) is d, and the diameter of the deformed segment (3) is i, satisfying: 0.3≤i / d≤0.

8.

14. The electrical connector according to any one of claims 1 to 4, characterized in that, The second connecting segment (4) is connected to a second protrusion (41) at one end away from the deformable segment (3), and the second protrusion (41) is configured to be riveted to the positive terminal.

15. The electrical connector according to claim 14, characterized in that, The second protrusion (41) is configured as an annular shape, and the inner circumferential surface of the second protrusion (41) is inclined away from its axis along the direction from the main body segment (2) to the second connecting segment (4).

16. The electrical connector according to claim 14, characterized in that, The width of the second protrusion (41) on the side away from the second connecting segment (4) is a2, and the width on the side closer to the second connecting segment (4) is b2, satisfying: 0 < a2 / b2 ≤ 1.

17. The electrical connector according to any one of claims 1 to 4, characterized in that, The outer peripheral surface of the second connecting section (4) is provided with a connecting part (42) that protrudes outward in a radial direction, and the connecting part (42) is configured to connect with the welding base plate.

18. The electrical connector according to claim 17, characterized in that, The diameter of the main body segment (2) is d, and the outer diameter of the connecting part (42) is j, satisfying: 1.05≤j / d≤1.

5.

19. The electrical connector according to claim 17, characterized in that, Along the direction from the second connecting segment (4) to the main body segment (2), the outer peripheral surface of the connecting part (42) is inclined in a direction away from its axis, wherein the inclination angle of the outer peripheral surface of the connecting part (42) is α, which satisfies: 20°≤α≤70°.

20. The electrical connector according to any one of claims 1 to 4, characterized in that, The outer peripheral surface of the main body segment (2) is provided with an insulating layer (23).

21. The electrical connector according to claim 20, characterized in that, The thickness of the insulating layer (23) is m, which satisfies: 0.002 mm ≤ m ≤ 0.5 mm.

22. A single-cell battery, characterized in that, Includes a positive terminal, a negative terminal cover, and an electrical connector as described in any one of claims 1 to 21, wherein the first connecting segment (1) is connected to the negative terminal cover, and the second connecting segment (4) is connected to the positive terminal, wherein the deformed segment (3) is in a broken state so that the first connecting segment (1) and the second connecting segment (4) are spaced apart.

23. A battery pack, characterized in that, Includes the single-cell battery as described in claim 22.

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