Convergence piece structure of high-magnification cylindrical battery and cylindrical battery
By designing the central hole and welding groove in the busbar structure and setting a welding boss on the busbar, the problem of insufficient welding area between the busbar and the pole ear is solved, and the overcurrent capability and service life of the battery are improved.
Patent Information
- Application Number
- CN202422270244.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-18
AI Technical Summary
The welding area between the busbar and the pole ear of the existing large cylindrical batteries is limited, resulting in insufficient current passing capacity, which can easily cause heat from the battery structural parts and affect service life.
A busbar structure is designed, including a concentric central hole and a welding groove extending radially, the bottom of the welding groove is thin and penetrates the edge of the busbar, increasing the welding area, and a welding boss is provided on the busbar to enhance the connection to the cover plate, and optimizing the current path to reduce resistance.
By increasing the welding area and optimizing the current path, the battery's overcurrent capability is improved, the resistance is reduced, and the battery's service life is extended.
Smart Images
Figure CN223218421U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium batteries, in particular to a busbar structure of a high-rate cylindrical battery and a cylindrical battery. Background Art
[0002] Large cylindrical batteries have greater capacity and energy density than small cylindrical batteries, and high-rate batteries are primarily used in consumer and power battery applications. Currently, large cylindrical battery components are connected and electrically conductive via welding. However, the limited welding area between the busbar and the tab limits current flow capacity. This often causes the battery components to heat up, or even melt due to the high temperatures, shortening the battery's lifespan. Utility Model Content
[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a busbar structure and a cylindrical battery with a reasonable structural design, which can increase the welding area and improve the flow capacity.
[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:
[0005] A busbar structure for a high-rate cylindrical battery comprises a circular busbar body having a concentrically arranged center hole in the middle thereof, characterized in that one side of the busbar body is a welding side for bonding to a winding core, and the other side has a radially extending welding groove, wherein a plurality of welding grooves are evenly distributed along the circumference of the busbar body.
[0006] In the above structure, a radially extending welding groove is provided on the busbar body. On the one hand, the welding area can be determined by the shape of the welding groove. On the other hand, the pole ears on each layer can be in contact with the welding side on the back of the welding groove and welded together. This can increase the welding area and shorten the current path of each layer of pole pieces, reduce resistance and improve the overcurrent capacity.
[0007] Furthermore, the thickness of the bottom of the welding groove is smaller than the thickness of the busbar body.
[0008] In this way, the bottom of the welding groove is made thinner, so that the bottom of the welding groove can better fit the ear during the welding process, avoiding cold welding and ensuring overcurrent.
[0009] Furthermore, one end of the welding groove passes through the edge of the busbar body, and the other end is close to the center hole.
[0010] Furthermore, the busbar body has a welding boss protruding in a direction away from the welding side, and the welding boss extends in an arc shape along the circumference of the busbar body.
[0011] In this way, the welding boss can be used to fit the cover plate, which facilitates reliable welding of the cover plate and the busbar body, thereby increasing the welding area between the busbar body and the cover plate and improving the flow capacity.
[0012] Furthermore, the welding boss is located in the area between two adjacent welding grooves, and a plurality of the welding bosses are evenly distributed along the circumferential direction.
[0013] Furthermore, the thickness of the welding boss is greater than the thickness of the busbar body.
[0014] Furthermore, the bottom of the welding groove is relatively protruded toward the welding side.
[0015] In this way, the bottom of the welding groove can better fit the tab. In addition, there is still a gap between the busbar and the tab between two adjacent welding grooves, which facilitates the flow of electrolyte.
[0016] Furthermore, the busbar body has a through pressure relief hole, and the pressure relief hole is located between two adjacent welding grooves.
[0017] Furthermore, six welding grooves are evenly distributed along the circumference of the busbar body.
[0018] A cylindrical battery, characterized by comprising the busbar structure of the high-rate cylindrical battery as described above.
[0019] In summary, the present invention has the advantages of reasonable structural design, increased welding area, and improved flow capacity. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 and Figure 2 Schematic diagram of the overall structure of the busbar in this embodiment. DETAILED DESCRIPTION
[0021] The present invention will be further described in detail below with reference to the embodiments.
[0022] When implementing: Figure 1 and Figure 2 As shown, a busbar structure for a high-rate cylindrical battery includes a circular busbar body 1, the middle of which has a concentrically arranged center hole 2, one side of the busbar body 1 being a welding side for fitting a winding core, and the other side having a welding groove 3 extending radially, the bottom of the welding groove 3 being relatively protruding toward the welding side, and the thickness of the bottom being less than the thickness of the busbar body 1.
[0023] like Figure 2As shown, the busbar body 1 has a welding boss 4 protruding in a direction away from the welding side. The welding boss 4 is thicker than the thickness of the busbar body 1 and extends in an arc shape along the circumference of the busbar body 1. In this embodiment, a plurality of welding grooves 3 are evenly distributed along the circumference of the busbar body 1. The welding boss 4 is located in the area between two adjacent welding grooves 3 and is evenly distributed along the circumference. In this embodiment, there are six welding grooves 3 and six welding bosses 4.
[0024] like Figure 1 As shown, one end of the welding groove 3 passes through the edge of the busbar body 1, and the other end is close to the center hole 2. The busbar body 1 has a through-set pressure relief hole 5, which is located between two adjacent welding grooves 3.
[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.
Claims
1. A busbar structure for a high-rate cylindrical battery, comprising a circular busbar body (1), wherein the middle portion of the busbar body (1) has a concentrically arranged central hole (2), characterized in that: One side of the busbar body (1) is a welding side for attaching to a winding core, and the other side has a welding groove (3) extending in the radial direction, and a plurality of the welding grooves (3) are evenly distributed along the circumference of the busbar body (1).
2. The busbar structure of a high-rate cylindrical battery according to claim 1, wherein: The thickness of the bottom of the welding groove (3) is smaller than the thickness of the busbar body (1).
3. The busbar structure of the high-rate cylindrical battery according to claim 1, wherein: One end of the welding groove (3) passes through the edge of the busbar body (1), and the other end is close to the center hole (2).
4. The busbar structure of a high-rate cylindrical battery according to claim 1, wherein: The busbar body (1) has a welding boss (4) protruding in a direction away from the welding side, and the welding boss (4) extends in an arc shape along the circumference of the busbar body (1).
5. The busbar structure of a high-rate cylindrical battery according to claim 4, wherein: The welding boss (4) is located in the area between two adjacent welding grooves (3), and a plurality of the welding bosses are evenly distributed along the circumference.
6. The busbar structure of a high-rate cylindrical battery according to claim 4, wherein: The thickness of the welding boss (4) is greater than the thickness of the busbar body (1).
7. The busbar structure of a high-rate cylindrical battery according to claim 1, wherein: The bottom of the welding groove (3) is relatively protruding toward the welding side.
8. The busbar structure of a high-rate cylindrical battery according to claim 7, wherein: The busbar body (1) is provided with a pressure relief hole (5) extending therethrough, and the pressure relief hole (5) is located between two adjacent welding grooves (3).
9. The busbar structure of a high-rate cylindrical battery according to claim 1, wherein: Six welding grooves (3) are evenly distributed along the circumference of the busbar body (1).
10. A cylindrical battery, characterized in that: A busbar structure comprising a high-rate cylindrical battery as claimed in any one of claims 1 to 9.