Pole assembly and battery
By designing the electrode assembly, the tabs are folded and connected to the electrode in one step, creating an efficient current conduction path. This solves the problems of high internal resistance and low space utilization in traditional blade batteries, thereby improving battery performance and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-07-25
- Publication Date
- 2026-07-31
AI Technical Summary
In traditional blade battery designs, the tabs need to be bent multiple times to connect with the terminals, resulting in increased internal resistance, low space utilization, and reduced energy density, which cannot meet the requirements of high performance and high energy density.
The design employs a pole assembly, including a pole body, a tab, and a connecting piece. The tab is folded once to form a connecting surface, and the connecting piece is connected to the pole body through a boss, reducing the number of folds and creating an efficient current conduction path.
It improves battery space utilization, reduces battery internal resistance and cost, and enhances battery performance and reliability.
Smart Images
Figure CN224582466U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of blade battery technology, and in particular to terminal assembly and battery. Background Technology
[0002] With the development of power battery technology, blade battery technology has been widely used in electric vehicles due to its advantages of fast charging speed and high energy density. Blade battery technology uses connecting tabs to connect the tabs and terminals, thereby constructing a current conduction path to meet the performance requirements of blade batteries in high power output and long-term cycle use.
[0003] In related technologies, for hollow annular terminals, the tabs of the electrode assembly need to be bent at least twice before they can be connected to the terminal through the sealing plate. The bending of the tabs takes up a lot of space, which increases the internal resistance of the product and occupies effective space, resulting in low product space utilization, reduced energy density, and limited battery performance.
[0004] In summary, traditional blade battery designs have significant shortcomings in terms of internal resistance performance, space utilization, and energy density, and cannot meet the requirements of modern blade batteries for high performance and high energy density. Summary of the Invention
[0005] Therefore, it is necessary to address the technical problems of high internal resistance, low space utilization, and low energy density caused by the repeated bending of the tabs and electrical connection with the terminals. This would provide a terminal assembly and battery that can construct an efficient and stable current conduction path between the electrode assembly and the terminal body, effectively improving the battery's space utilization, reducing battery costs, decreasing battery internal resistance, and improving battery performance.
[0006] A first aspect of the present invention provides a pole assembly comprising:
[0007] The pole body has an assembly hole that extends through in a first direction;
[0008] The electrode tab has one end connected to the electrode assembly and the other end folded to form a connecting surface extending in the second direction;
[0009] The connecting piece includes a connecting plate portion. In the first direction, the connecting plate portion is spaced apart from the electrode group. The side of the connecting plate portion opposite to the electrode group is provided with a welding area and a boss portion. The welding area is in contact with the connecting surface and connected to the electrode lug. The boss portion is inserted into the assembly hole and connected to the electrode post body.
[0010] In one embodiment, the boss portion includes a boss end face and a boss side face, the boss end face being away from the connecting plate portion in the first direction, and the boss side face connecting the boss end face and the connecting plate portion.
[0011] In one embodiment, a guide angle is provided at the connection between the end face of the boss and the side face of the boss, and the guide angle is provided around the outer periphery of the end face of the boss.
[0012] In one embodiment, the radius of the guide angle is R, where R satisfies: 0.2mm ≤ R ≤ 3.0mm.
[0013] In one embodiment, the wall thickness of the connecting plate is W1, where W1 satisfies: 0.8mm ≤ W1 ≤ 1.5mm; and / or,
[0014] The wall thickness of the side of the boss is W2, where W2 satisfies: 1.5mm ≤ W2 ≤ 2.5mm; and / or,
[0015] The wall thickness of the boss end face is W3, and W3 satisfies: 2.0mm≤W3≤3.2mm.
[0016] In one embodiment, the wall thickness W3 of the boss end face is greater than the wall thickness W2 of the boss side face; and / or,
[0017] The wall thickness W2 on the side of the boss is greater than the wall thickness W1 of the connecting plate.
[0018] In one embodiment, in the first direction, the end face of the boss is flush with the end face of the pole body away from the pole group, or the end face of the boss extends beyond the end face of the pole body away from the pole group.
[0019] In one embodiment, the side of the boss is attached to the inner wall of the mounting hole and has a weld mark formed by seam welding.
[0020] In one embodiment, the depth of the solder mark is H, where H satisfies: 0.8mm ≤ H ≤ 1.6mm.
[0021] A second aspect of the present invention provides a battery comprising the aforementioned terminal assembly.
[0022] The aforementioned terminal assembly and battery, by setting connecting tabs, can achieve efficient and stable current transmission between the terminal group and the terminal body while reducing the number of times the tabs are folded, thereby effectively improving the battery's space utilization, reducing battery costs, reducing battery internal resistance, and improving battery performance and reliability.
[0023] This application also has the following advantages:
[0024] (1) The wall thickness W1 of the connecting plate portion of this application is 0.8mm-1.5mm, which can improve the current conduction efficiency while ensuring the structural stability of the connecting plate portion.
[0025] (2) The wall thickness W2 of the boss side in this application is 1.5mm-2.5mm, which can improve the mechanical strength and assembly stability of the boss side.
[0026] (3) The wall thickness W3 of the boss end face of this application is 2.0mm-3.2mm, which is sufficient to withstand the heat and mechanical stress in the subsequent welding process and ensure the reliability of the electrical connection with the external circuit.
[0027] (4) The boss end face of this application is not lower than the pole connection surface of the pole body in the first direction, which can ensure that the welding tool can act smoothly and accurately on the pole connection surface during the welding process, thus ensuring the welding quality and welding effect.
[0028] (5) The depth H of the solder mark between the boss and the mounting hole in this application is 0.8mm-1.6mm. Within this depth range, it can ensure that the solder mark penetrates the surface oxide layer and forms a sufficient metallurgical bond, thereby providing reliable electrical connection and mechanical strength. At the same time, it can avoid the problems of heat-affected zone expansion, material performance degradation and mounting hole deformation caused by excessive welding, and ensure the overall performance and stability of the battery.
[0029] (6) The radius R of the guide angle of this application is 0.2mm-3.0mm, which can ensure that the connecting piece is smoothly and accurately inserted into the assembly hole and improve assembly efficiency. Attached Figure Description
[0030] Figure 1 This is a schematic diagram of the battery structure in one embodiment of this application.
[0031] Figure 2 This is a cross-sectional schematic diagram of a battery in one embodiment of this application.
[0032] Figure 3 for Figure 2 A magnified view of part A in the middle.
[0033] Figure 4 This is a schematic diagram showing the connection between the electrode tab, the electrode assembly, and the connecting piece in one embodiment of this application.
[0034] Figure 5 This is a schematic diagram of the connecting piece in one embodiment of this application.
[0035] Figure 6 This is a top view of the connecting piece in one embodiment of this application.
[0036] Figure 7 for Figure 6 A sectional view along line A.
[0037] Figure 8 for Figure 6 Sectional view along line B.
[0038] Reference numerals: 1. Housing; 2. Cover plate; 3. Insulator; 4. Sealing ring; 5. Connecting piece; 6. Pole post body; 7. Welding block; 8. Pole assembly; 9. Pole tab; 10. Pole post assembly;
[0039] S, solder mark;
[0040] 51. Connecting plate portion; 52. Boss portion;
[0041] 511. Welding area;
[0042] 521. Side of the boss; 522. End face of the boss; 523. Guide angle. Detailed Implementation
[0043] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0044] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0045] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0046] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0047] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0048] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0049] An embodiment of this application provides an electrode assembly 10, including: an electrode body 6, an electrode tab 9, and a connecting piece 5.
[0050] The specific structure of the pole assembly according to this embodiment will be described below.
[0051] See Figure 3 The pole body 6 is provided with an assembly hole that extends through the first direction, and the assembly hole cooperates with the boss portion 52 of the connecting piece 5; in some embodiments, the pole body 6 is annular, preferably a hollow racetrack configuration, which can reduce processing costs.
[0052] See Figure 3 and Figure 4The tab 9 has one end connected to the electrode assembly 8, and the other end folded to form a connecting surface extending along a second direction. In some embodiments, the tab 9 undergoes a single 90° bend (its end face is folded from vertical to horizontal). The fewer folds, the less deformation and stress concentration of the tab 9 during processing, which helps maintain the mechanical strength and conductivity of the tab 9. At the same time, it can reduce the space occupied by the tab 9 inside the battery, thereby improving the space utilization rate inside the battery and providing operating space for the layout and optimization of other components. In addition, a single fold can reduce the contact resistance of the current in the tab 9, thereby improving the current conduction efficiency, reducing the internal resistance of the battery, reducing energy loss, and improving the overall performance of the battery.
[0053] Please continue reading. Figure 3 and Figure 4 The connecting piece 5 includes a connecting plate portion 51. In a first direction, the connecting plate portion 51 is spaced apart from the electrode group 8. The side of the connecting plate portion 51 facing away from the electrode group 8 has a welding area 511 and a boss portion 52. The welding area 511 is attached to the connecting surface and connected to the electrode tab 9. The boss portion 52 is inserted into the assembly hole and connected to the terminal body 6. The connecting piece 5 is used to realize the electrical connection between the electrode tab 9 and the terminal body 6, thereby constructing a current conduction path between the electrode group 8 and the terminal body 6. This can effectively improve the space utilization of the battery, reduce the battery cost, reduce the battery internal resistance, and improve the battery performance. The protrusion 52 of the connecting piece 5 is connected to the pole body 6. After welding, a seal and electrical connection are achieved. The connecting plate 51 is connected to the tab 9 after one fold. In some embodiments, the connecting plate 51 is flat and its end face fits against the horizontal end face of the tab 9. After welding, a stable current conduction path is formed, thereby ensuring that a sufficiently large contact area is formed between the connecting piece 5 and the tab 9 to reduce contact resistance, improve current conduction efficiency and connection reliability.
[0054] See Figure 5 and Figure 6 The boss portion 52 includes a boss end face 522 and a boss side face 521. The boss end face 522 is located away from the connecting plate portion 51 in a first direction, and the boss side face 521 connects the boss end face 522 and the connecting plate portion 51. In some embodiments, the boss portion 52 is a hollow structure, and the wall thickness of the boss side face 521 is uniform.
[0055] A guide angle 523 is provided at the connection between the boss end face 522 and the boss side face 521. The guide angle 523 is set around the outer periphery of the boss end face 522. The radius of the guide angle 523 is R, and R satisfies: 0.2mm≤R≤3.0mm. By setting the guide angle 523, it can be ensured that the connecting piece 5 is smoothly and accurately inserted into the assembly hole, thereby improving assembly efficiency.
[0056] See Figure 7 and Figure 8The wall thickness of the connecting plate 51 is W1, which satisfies: 0.8mm≤W1≤1.5mm. The connecting plate 51 needs to balance lightweight and conductivity. Within this wall thickness W1 range, the connecting plate 51 can improve current conduction efficiency while ensuring structural stability.
[0057] And / or, the wall thickness of the boss side 521 is W2, where W2 satisfies: 1.5mm≤W2≤2.5mm; the boss side 521 needs to withstand the stress during the assembly process and ensure a tight fit with the inner surface of the mounting hole of the pole body 6. Within this wall thickness W2 range, the mechanical strength and assembly stability of the boss side 521 can be improved.
[0058] And / or, the wall thickness of the boss end face 522 is W3, where W3 satisfies: 2.0mm≤W3≤3.2mm; during battery use, the boss end face 522 performs the same function as the terminal connection surface of the terminal body 6, serving as an electrical connection point with the external circuit. It must have sufficient thickness to withstand the thermal effects and mechanical stress during subsequent welding processes, ensuring the reliability of the electrical connection with the external circuit.
[0059] The wall thickness W3 of the boss end face 522 is greater than the wall thickness W2 of the boss side face 521; and / or, the wall thickness W2 of the boss side face 521 is greater than the wall thickness W1 of the connecting plate portion 51. This wall thickness gradient design enables the connecting piece 5 to achieve structural lightweighting and cost optimization while meeting the requirements of electrical connection and mechanical strength.
[0060] See Figure 3 ,like Figure 1 As shown, in the first direction, the boss end face 522 is flush with the end face of the pole body 6 away from the pole group 8, or the boss end face 522 extends beyond the end face of the pole body 6 away from the pole group 8, which can ensure that the welding tool can act smoothly and accurately on the pole connection surface during the welding of the busbar (i.e., busbar busbar), thus ensuring the welding quality and welding effect.
[0061] See Figure 3 In some embodiments, the side surface 521 of the boss is attached to the inner wall of the mounting hole and a weld mark S is formed by seam welding; the depth of the weld mark S is H, and H satisfies: 0.8mm≤H≤1.6mm. Within this depth range, it can ensure that the weld mark S penetrates the surface oxide layer and forms sufficient metallurgical bond, thereby providing reliable electrical connection and mechanical strength; at the same time, it can avoid the problems of heat-affected zone expansion, material performance degradation and mounting hole deformation caused by excessive welding, and ensure the overall performance and stability of the battery.
[0062] In this embodiment, refer to Figure 4The first direction shown in the figure can be parallel to the height direction of the above-mentioned pole group 8, that is, the first direction is parallel to the axis of the pole body 6; the second direction shown in the figure is parallel to the thickness direction of the above-mentioned pole group 8, that is, the direction of the short side of the two bottom surfaces of the pole group 8.
[0063] See Figure 1 and Figure 2 The battery of this embodiment includes the aforementioned terminal assembly 10, which is mounted on a cover plate 2. A mounting hole is provided on the end face of the cover plate 2, and the cover plate 2 is fitted over the terminal assembly 10 through the mounting hole. A welding block 7 is also fitted over the outside of the terminal assembly 2. In a first direction, the welding block 7 is spaced apart from the cover plate 2, and the gap formed between the welding block 7, the terminal body 6, and the cover plate 2 is filled and sealed by a sealing ring 4. In some embodiments, the cover plate 2 may be made of plain aluminum plate, and an insulating component 3 is installed between the cover plate 2 and the terminal body 6 to improve the overall structural stability of the battery. The battery of this embodiment also includes a terminal group 8 connected to a tab 9. The outside of the terminal group 8 is wrapped and protected by a housing 1, and the cover plate 2 is mounted on the housing 1. Compared with traditional blade batteries, the battery of this application has low internal resistance and low manufacturing cost. The terminal assembly 10 used can reduce the number of times the tabs 9 are folded through the connecting piece 5, and realize efficient and stable current transmission between the electrode group 8 and the terminal body 6, thereby effectively improving the space utilization of the battery, reducing the battery cost, reducing the battery internal resistance, and improving the battery performance.
[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0065] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A pole assembly, characterized by include: The pole body has an assembly hole that extends through in a first direction; The electrode tab has one end connected to the electrode assembly and the other end folded to form a connecting surface extending in the second direction; The connecting piece includes a connecting plate portion. In the first direction, the connecting plate portion is spaced apart from the electrode group. The side of the connecting plate portion opposite to the electrode group is provided with a welding area and a boss portion. The welding area is in contact with the connecting surface and connected to the electrode lug. The boss portion is inserted into the assembly hole and connected to the electrode post body.
2. The pole assembly of claim 1, wherein, The boss portion includes a boss end face and a boss side face. The boss end face is away from the connecting plate portion in the first direction, and the boss side face connects the boss end face and the connecting plate portion.
3. The pole assembly of claim 2, wherein, A guide angle is provided at the connection between the end face of the boss and the side face of the boss, and the guide angle is arranged around the outer periphery of the end face of the boss.
4. The pole assembly of claim 3, wherein, The radius of the guide angle is R, and R satisfies: 0.2mm≤R≤3.0mm.
5. The pole assembly of claim 2, wherein, The wall thickness of the connecting plate is W1, where W1 satisfies: 0.8mm ≤ W1 ≤ 1.5mm; and / or, The wall thickness of the side of the boss is W2, where W2 satisfies: 1.5mm ≤ W2 ≤ 2.5mm; and / or, The wall thickness of the boss end face is W3, and W3 satisfies: 2.0mm≤W3≤3.2mm.
6. The pole assembly of claim 5, wherein, The wall thickness W3 of the boss end face is greater than the wall thickness W2 of the boss side face; and / or, The wall thickness W2 on the side of the boss is greater than the wall thickness W1 of the connecting plate.
7. The pole assembly of claim 2, wherein, In the first direction, the end face of the boss is flush with the end face of the pole body away from the pole group, or the end face of the boss extends beyond the end face of the pole body away from the pole group.
8. The pole assembly of claim 2, wherein, The side of the boss is attached to the inner wall of the assembly hole and has a weld mark formed by seam welding.
9. The pole assembly of claim 8, wherein, The depth of the solder mark is H, and H satisfies: 0.8mm≤H≤1.6mm.
10. A battery, characterized by Includes a pole assembly as described in any one of claims 1 to 9.