Convergence disc with current limiting function
By designing a bus disk with a circular ring and a flow guide, combined with high-temperature tape and bending line structure, the problem of untimely fuse of existing bus disks is solved, and safe fuse of lithium-ion batteries in a short-circuit state is achieved, reducing the Risk of fire or explosion.
Patent Information
- Application Number
- CN202420229737.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-31
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-01-31
AI Technical Summary
The overflow area of the connecting part of the existing bus disk is large, resulting in full heating temperature rise and untimely blowing, which increases the risk of lithium-ion batteries catching fire or explosion in a short-circuit state.
A bus disk with current limiting function is designed, including a circular ring-shaped first bus area and a second bus area arranged in a circumferential direction. A blowing area with a smaller cross-section is provided on the flow guide, and it is covered on both sides of the blowing area. The high-temperature tape has a through circular hole in the middle of the guide sheet and a bent line arranged in the transverse direction, forming an area that is easier to fuse.
The overflow area of the fuse zone is reduced, the temperature of the high-temperature tape is accumulated, the fuse response speed is improved, ensuring that the busbar can be blown in time, and the safety of the battery is improved.
Smart Images
Figure CN222338448U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium batteries, in particular to a busbar with a current limiting function. Background Art
[0002] At present, with the rapid development of the new energy industry, society's requirements for the energy density, safety performance, and fast charging performance of lithium-ion batteries have been further improved. As a highly recognized solution, large cylindrical batteries have ushered in a broad market space. For single cells, once a short circuit occurs in the external circuit, the temperature inside the battery will rise. The busbar is a circuit connection part on the battery core. In order to ensure the safety of the battery, the busbar needs to have a current limiting function so that it can be disconnected in time to prevent the battery from continuing to heat up in a short-circuit state and causing more serious consequences. The connection part of the existing busbar has a large current flow area, which leads to a full temperature rise and untimely fusing, increasing the risk of fire or explosion of the battery. Utility Model Content
[0003] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is: how to provide a busbar with a reasonable structural design that can not only meet the current requirements of the rate battery, but also can be blown in time, thereby improving the safety of use.
[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0005] A busbar with a current limiting function, characterized in that it includes a first busbar area for connecting poles and a second busbar area for connecting core ears, the first busbar area is in a circular ring shape, the second busbar area is evenly distributed along the circumferential direction on the outside of the first busbar area, the first busbar area has a guide plate that corresponds to the second busbar area one by one and extends radially outward, the end of the guide plate away from the first busbar area is connected to the second busbar area; each of the guide plates has a fuse area with a smaller cross-section, and both sides of the fuse area are covered with high-temperature tape.
[0006] In this way, a guide plate is arranged between each second bus area and the first bus plate, a narrow fuse area is arranged on the guide plate, and high-temperature tape is covered on both sides of the fuse area. On the one hand, the flow area of the fuse area is reduced, and on the other hand, the temperature is concentrated by the high-temperature tape to improve the response speed, so that the fuse area can be fused in time.
[0007] Furthermore, a circular hole is provided through the middle of the guide plate, and the area where the circular hole is located forms the fuse zone.
[0008] Furthermore, the fuse zone has a bending portion bent along a transversely arranged bending line, so that the first confluence zone protrudes upward relative to the second confluence zone; and the inscribed circles of the bending lines of the plurality of fuse zones are arranged concentrically with the first confluence zone.
[0009] In this way, the bending line is affected by the bending, forming an area that is more prone to melting. Once melted, due to the height difference formed by the bending and the external force of the welding parts of the first busbar area and the second busbar area respectively, the distance between the melted parts will be further increased, making the melting more reliable.
[0010] Furthermore, the bending height of the bending portion is 0.8 to 1.5 mm.
[0011] Furthermore, the outer side of the second confluence area has a guide ring arranged concentrically with the first confluence area, the end of the guide plate facing away from the first confluence area is connected to the guide ring, and the side of the second confluence area facing away from the first confluence area is connected to the guide ring.
[0012] Furthermore, the second confluence area is fan-shaped.
[0013] Furthermore, the circular hole is located at one end of the guide plate close to the guide ring.
[0014] Furthermore, the outer side of the guide ring has a semicircular notch arranged in one-to-one correspondence with the guide plate.
[0015] Furthermore, the difference between the width of the guide plate and the diameter of the circular hole is 2 to 3 mm.
[0016] Furthermore, the first confluence area, the second confluence area, the guide plate and the guide ring are integrally formed.
[0017] In summary, the utility model has the advantages of reasonable structural design, which can not only meet the current demand of the rate battery, but also can be blown off in time, which is beneficial to improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the overall structure of this embodiment.
[0019] Figure 2 Schematic diagram of the top view of the structure of this embodiment. DETAILED DESCRIPTION
[0020] The present invention will be further described in detail below in conjunction with the embodiments.
[0021] When implementing: Figure 1 and Figure 2As shown, a busbar with a current limiting function includes a first busbar area 1 for connecting poles and a second busbar area 2 for connecting winding core pole ears. The first busbar area 1 is annular, and the second busbar area 2 is evenly distributed on the outside of the first busbar area 1 along the circumferential direction. The first busbar area 1 has a guide plate 3 corresponding to the second busbar area 2 and extending radially outward, and the end of the guide plate 3 away from the first busbar area 1 is connected to the second busbar area 2; each of the guide plates 3 has a fuse area 4 with a reduced cross section, and both sides of the fuse area 4 are covered with high-temperature tape. The outside of the second busbar area 2 has a guide ring 5 concentrically arranged with the first busbar area 1, and the end of the guide plate 3 away from the first busbar area 1 is connected to the guide ring 5, and the side of the second busbar area 2 away from the first busbar area 1 is connected to the guide ring 5, and the second busbar area 2 is fan-shaped. The middle part of the guide plate 3 has a circular hole that is set through, and the area where the circular hole is located forms the fuse zone 4. The circular hole is located at one end of the guide plate 3 close to the guide ring 5. The difference between the width of the guide plate 3 and the diameter of the circular hole is 2 to 3 mm. The outer side of the guide ring 5 has a semicircular notch that is set one-to-one with the guide plate 3.
[0022] like Figure 1 As shown, the first confluence area 1, the second confluence area 2, the guide plate 3 and the guide ring 5 are integrally formed, and the fuse area 4 has a bending portion that is bent along a laterally arranged bending line, so that the first confluence area 1 bulges upward relative to the second confluence area 2; the inscribed circles of the bending lines of the plurality of fuse areas 4 are concentrically arranged with the first confluence area 1, and the bending height of the bending portion is 0.8 to 1.5 mm.
[0023] With the bus plate of this embodiment, a guide plate is arranged between each second bus area and the first bus plate, a narrow fuse area is arranged on the guide plate, and high-temperature tape is covered on both sides of the fuse area. On the one hand, the flow area of the fuse area is reduced, and on the other hand, the temperature is concentrated by the high-temperature tape to improve the response speed, so that the fuse area can be fused in time.
[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. A busbar with current limiting function, characterized in that: The invention comprises a first busbar (1) for connecting poles and a second busbar (2) for connecting winding core pole ears, wherein the first busbar (1) is in the shape of a ring, and the second busbar (2) is evenly distributed along the circumferential direction on the outer side of the first busbar (1), and the first busbar (1) has a guide plate (3) which corresponds to the second busbar (2) one by one and extends radially outward, and the end of the guide plate (3) away from the first busbar (1) is connected to the second busbar (2); each of the guide plates (3) has a fuse area (4) with a reduced cross section, and both sides of the fuse area (4) are covered with high-temperature adhesive tape.
2. The busbar with current limiting function according to claim 1, characterized in that: The middle part of the guide plate (3) has a circular hole extending therethrough, and the area where the circular hole is located forms the fuse area (4).
3. The busbar with current limiting function according to claim 1, characterized in that: The fuse area (4) has a bending portion that is bent along a bending line arranged laterally, so that the first confluence area (1) protrudes upward relative to the second confluence area (2); and the inscribed circles of the bending lines of the plurality of fuse areas (4) are arranged concentrically with the first confluence area (1).
4. The busbar with current limiting function as claimed in claim 3, characterized in that: The bending height of the bending portion is 0.8-1.5 mm.
5. The busbar with current limiting function as claimed in claim 2, characterized in that: The outer side of the second confluence area (2) is provided with a guide ring (5) arranged concentrically with the first confluence area (1); the end of the guide plate (3) facing away from the first confluence area (1) is connected to the guide ring (5); and the side of the second confluence area (2) facing away from the first confluence area (1) is connected to the guide ring (5).
6. The busbar with current limiting function as claimed in claim 5, characterized in that: The second confluence area (2) is fan-shaped.
7. The busbar with current limiting function as claimed in claim 5, characterized in that: The circular hole is located at one end of the guide plate (3) close to the guide ring (5).
8. The busbar with current limiting function according to claim 7, characterized in that: The outer side of the guide ring (5) has a semicircular notch arranged in a one-to-one correspondence with the guide plate (3).
9. The busbar with current limiting function as claimed in claim 2, characterized in that: The difference between the width of the guide plate (3) and the diameter of the circular hole is 2 to 3 mm.
10. The busbar with current limiting function according to claim 5, characterized in that: The first confluence area (1), the second confluence area (2), the guide plate (3) and the guide ring (5) are integrally formed.