Flexible connection busbar

Abstract

The utility model discloses a flexible connection busbar, which relates to the technical field of cylindrical battery busbars, and comprises sheets with different sizes, at least one sheet is formed by overlapping in different combinations, each sheet comprises a circular bottom sheet and a strip-shaped connecting strip, the different sizes of the thin sheets are that the lengths and the widths of the connecting strips are different, the diameters of the bottom sheets are different, the small connecting strips are connected to the small bottom sheets, and the large connecting strips are connected to the large bottom sheets. Under the condition that the thickness is increased, the winding core is easy to bend, the alignment degree after bending is improved, and the winding core can be compatible with winding cores of different sizes.

Description

Technical Field

[0001] The utility model relates to the technical field of cylindrical battery busbars, in particular to a soft-connection busbar. Background Art

[0002] In the prior art, hard-connected and soft-connected buses are mainly used to realize the current carrying of the pole ears on the internal pole pieces of the battery cell and the external pole ears. Soft connection method: first weld the winding core pole ears with the foldable connecting plate busbar, and then weld the connecting plate busbar with the positive and negative electrode cover plates; hard connection method: directly weld the pole ears to the busbar of the cover plate without the need for an intermediate connecting plate. The soft connection busbar needs to be bent after welding, and then the subsequent assembly is realized. The hard connection does not need to be bent, but the soft connection of different winding core sizes needs to be designed with different sizes. The bending process of the soft connection busbar is necessary during installation, and the size is fixed. The soft connection busbar is not easy to bend. As the overcurrent demand increases, the thickness of the busbar will also increase, making it more difficult to bend. The alignment after bending is poor, which affects the side welding between the subsequent cover plate and the shell. Fixed-size soft connection buses can only be compatible with fixed sizes, and cannot be compatible with larger or smaller diameter winding core welding. Utility Model Content

[0003] Technical problems to be solved by utility models

[0004] In order to solve the technical problem of how to optimize the bending performance of a soft-connection busbar, improve its alignment, and be compatible with different sizes, the utility model provides a soft-connection busbar, which is easy to bend when the thickness increases, improves the alignment after bending, and is compatible with winding cores of different sizes.

[0005] Technical Solution

[0006] In order to solve the above problems, the technical solution provided by the utility model is:

[0007] A flexible connection busbar comprises thin sheets of different sizes, at least one of which is stacked in different combinations, the thin sheets comprising a circular base sheet and a strip-shaped connecting strip, the thin sheets have different sizes in that the connecting strips have different lengths and widths and different diameters of the base sheets, a small connecting strip is connected to a small base sheet, and a large connecting strip is connected to a large base sheet.

[0008] Circular film: As the foundation of the entire structure, the diameter of the film directly affects the size selection of the connecting strip and the load-bearing capacity of the overall structure. Larger films can provide a larger contact area and are suitable for high-current application scenarios; while smaller films are more suitable for low-current or space-constrained environments. Strip connecting strips: Connecting strips are used to connect multiple films in series or in parallel to form a more complex circuit network. The different lengths and widths of the connecting strips mean that their resistance and heat dissipation capabilities will also be different. Longer and wider connecting strips can carry more current, but may take up more space; on the contrary, shorter and narrower connecting strips are more compact in space utilization, but have limited current carrying capacity. Different combinations and superpositions: By combining and superimposing films of different sizes and connecting strips in a specific way, a flexible connection busbar that meets specific electrical characteristics and mechanical strength requirements can be created. For example, in situations where high current transmission is required, a combination of large films and wide connecting strips can be used; while in places where space is limited, a combination of small films and narrow connecting strips may be required.

[0009] Alternatively, an electric current may be passed through the surface of the sheet.

[0010] The sheets are stacked and require an electric current to carry the current.

[0011] Optionally, the surface of the sheet is a flat surface.

[0012] The flat surface of the sheet is designed to increase the contact area between the sheets and thus enhance the current transmission efficiency. The flat surface ensures that when two sheets contact each other, they can form a maximum physical contact. This reduces the contact resistance, because the contact resistance is inversely proportional to the roughness of the contact surface and the contact area. In other words, the larger the contact area, the smaller the contact resistance, and the less energy loss when the current passes. The flat surface helps the current to be distributed more evenly between the sheets. If the surface is not flat, the current may be concentrated in certain local areas, causing hot spots and potential overheating problems, while the flat surface can avoid this and make the current flow evenly across the entire contact surface. In power transmission, the conductivity of the conductor directly affects the efficiency and stability of the system. A flat surface can reduce surface defects such as pits and protrusions, which increase surface resistance and reduce conductivity. Therefore, by keeping the surface of the sheet flat, the best conductivity can be ensured. A flat surface can also reduce wear and fatigue caused by mechanical stress, which is very important for power systems that operate for a long time. Good contact conditions reduce friction and fretting corrosion, helping to extend the life of the sheet.

[0013] Optionally, after the thin sheets are stacked, the centers of the circles of the bottom sheets are coaxial.

[0014] After the sheets are stacked, they are aligned at the bottom center of the cylindrical battery. Coaxial alignment ensures the stability and balance of the entire stacked structure and prevents any unbalanced force or torque caused by eccentric loads. In cases involving power transmission or electromagnetic field applications, coaxial alignment helps optimize the current path or magnetic field distribution, thereby improving the overall efficiency of the system. In applications subject to pressure or shear forces, coaxial alignment ensures that the force is evenly distributed and avoids local stress concentration, which helps to improve the strength and durability of the structure. For applications that require good thermal conduction, coaxial alignment ensures that heat is transferred from one sheet to another along the shortest path, thereby improving heat dissipation efficiency.

[0015] Optionally, a positioning hole is provided at the end of the connecting strip.

[0016] Dowel holes are used to ensure that the connecting strips are accurately aligned with corresponding holes in other components when installed. This ensures that all components are properly aligned, especially in applications that require high-precision alignment. Dowel holes can be used to insert bolts, pins, or other fasteners to secure the connecting strips to other structural members. These fasteners pass through the dowel holes and mate with holes in other components to form a stable connection. In some cases, dowel holes may allow a certain adjustment range to allow for fine-tuning during installation to ensure that the final assembly achieves the required accuracy requirements. The use of dowel holes can significantly reduce errors during the assembly process because they provide fixed reference points that help standardize and simplify the assembly process.

[0017] Optionally, the connection between the bottom sheet and the connecting strip is thinned.

[0018] Convenient for bending thin sheets.

[0019] Optionally, the edge of the connecting strip is provided with a rounded structure.

[0020] Rounded edges can prevent accidental injuries during operation or maintenance, especially when handling large or heavy mechanical parts. Smooth edges can avoid cuts or abrasions. On parts that are subject to loads or stress, rounded corners can help disperse stress concentration, reduce material fatigue and cracks, and thus improve the durability and reliability of the connecting strip. The design of rounded edges also facilitates molding and processing during manufacturing. In processes such as stamping, casting or injection molding, rounded corners are easier to achieve than sharp corners.

[0021] Optionally, the sheet is an integrally formed structure.

[0022] One-piece structures are generally stronger and more rigid because there are no seams or welds, reducing potential weak points. The entire sheet works as a single unit, distributing loads and stresses more evenly.

[0023] Beneficial Effects

[0024] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0025] The technical solution provided by the utility model adopts a multi-layer bus stacking method of thin sheets of the same or different sizes, which solves the problems of difficulty in bending and poor alignment of a single-piece soft-connection bus. At the same time, the welding of core rolls of different sizes can be coped with by adjusting the matching method of thin-sheet buses of different sizes, and different current-carrying capacity requirements can be met. The quality can be significantly improved in the process of battery cell assembly and manufacturing, the difficulty of bending the soft-connection connecting sheets can be reduced, the alignment can be improved, and it can adapt to cylindrical battery cells of different sizes and meet different current-carrying capacity requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a superimposed flexible connection busbar proposed in an embodiment of the utility model;

[0027] Figure 2 One of the implementation methods of a soft connection bus proposed in an embodiment of the utility model;

[0028] Figure 3 The second implementation method of a soft connection bus proposed in the embodiment of the utility model;

[0029] Figure 4 The third implementation method of a soft connection bus proposed in the embodiment of the utility model;

[0030] 1. First thin sheet; 2. Second thin sheet; 3. Third thin sheet; 4. Roll core. DETAILED DESCRIPTION

[0031] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.

[0032] Example 1

[0033] Combined with Figure 1 A flexible connection busbar includes sheets of different sizes, at least one of which is formed by stacking in different combinations, the sheets include a circular bottom sheet and a strip-shaped connecting strip, the sheets have different sizes because the connecting strips have different lengths and widths and the bottom sheets have different diameters, a small connecting strip is connected to a small bottom sheet, and a large connecting strip is connected to a large bottom sheet. In this embodiment, there are three types of sheets, namely a first sheet 1, a second sheet 2, and a third sheet 3, the size of the first sheet 1 is 18 inches, the size of the second sheet 2 is 26 inches, and the size of the third sheet 3 is 46 inches.

[0034] Electric current can pass through the surface of the sheet, and the sheet is made of metal, such as iron.

[0035] The surface of the sheet is a flat surface.

[0036] After the sheets are stacked, the centers of the circles of the bottom sheets are coaxial.

[0037] The ends of the connecting strips are provided with positioning holes, and the positioning holes of the connecting strips of different sizes are the same and have the same distance from the center of the bottom film.

[0038] The connection between the bottom sheet and the connecting strip is thinned by 1 mm.

[0039] The edge of the connecting strip is provided with a rounded structure.

[0040] The thin sheet is an integrally formed structure.

[0041] In this embodiment, the diameter of the circular area can be designed to adapt to but not limited to the diameter of 46XXX / 26XXX / 21XXX / 18XXX battery models.

[0042] Ordinary 46XXX battery cell assembly, when there is no need for overcurrent Figure 2 As shown,

[0043] S1: Welding the bottom layer of 46-size thin-sheet busbars;

[0044] S2: welding middle layer 26 size sheet busbar;

[0045] S3: welding the top 18 size sheet busbar;

[0046] S4: The collecting plate is bent into the shell.

[0047] Example 2

[0048] Combined with Figure 3 , a soft connection bus in this embodiment can be improved as follows compared with the technical solution of embodiment 1:

[0049] 26XXX battery cell assembly, when there is no need for overcurrent Figure 3 As shown,

[0050] S1: Remove 46 size flakes;

[0051] S2: Weld the bottom layer of 26-size thin-sheet busbars;

[0052] S3: welding the top 18 size sheet busbar;

[0053] S4: The collecting plate is bent into the shell.

[0054] Example 3

[0055] Combined with Figure 4, a soft connection busbar of this embodiment can be improved as follows compared with the technical solution of embodiment 1 or 2:

[0056] 46XXX battery cell assembly, if there is a need for overcurrent Figure 4 As shown,

[0057] S1: Remove the 26 and 18 size sheets and stack three layers of 46 size sheets;

[0058] S2: welding 46 size thin sheet busbar;

[0059] S3: The collecting plate is bent into the shell.

[0060] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A flexible connection bus, characterized in that: It comprises thin sheets of different sizes, at least one of which is stacked in different combinations, and the thin sheets comprise a circular base sheet and a strip-shaped connecting strip. The different sizes of the thin sheets are that the length and width of the connecting strip are different and the diameter of the base sheet is different. A small connecting strip is connected to a small base sheet, and a large connecting strip is connected to a large base sheet.

2. A flexible connection bus according to claim 1, characterized in that: The surface of the sheet can be passed with an electric current.

3. A flexible connection bus according to claim 2, characterized in that: The surface of the sheet is a flat surface.

4. The flexible connection bus according to claim 1, characterized in that: After the thin sheets are stacked, the centers of the circles of the bottom sheets are coaxial.

5. A flexible connection busbar according to claim 4, characterized in that: The end of the connecting strip is provided with a positioning hole.

6. The flexible connection bus according to claim 1, characterized in that: The connection between the bottom sheet and the connection strip is thinned.

7. The flexible connection bus according to claim 1, characterized in that: The edge of the connecting strip is provided with a rounded structure.

8. The flexible connection bus according to claim 1, characterized in that: The thin sheet is an integrally formed structure.

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