Power type cylindrical battery bus structure and cylindrical battery

Abstract

The utility model discloses a kind of power type cylindrical battery busbar structure and cylindrical battery, wherein, busbar structure includes the busbar body of overall circular, the middle part of the busbar body has the welding boss formed by overall drawing, the diameter of the welding boss is matched with the diameter of the pole column to be matched;The side wall of the welding boss has the flow hole of through arrangement along radial direction, the flow hole is set along the circumferential distribution of the welding boss Multiple. The utility model's power type cylindrical battery busbar structure and cylindrical battery are all with structure design reasonable, facilitate and pole column to be bonded welding, it is favorable to increase welding area, reduce battery internal resistance and the like advantages.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field, especially a kind of power type cylindrical battery busbar structure and cylindrical battery. BACKGROUND

[0002] At present, with the rapid development of new energy industry, the energy density, safety performance, fast charging performance and other requirements of lithium ion battery are further improved, and large cylindrical battery, as a kind of widely recognized solution, welcomes broad market space.

[0003] There are mainly two welding methods between the pole of the existing cylindrical battery and the busbar, one is to use conductive handle to weld and connect, but the cross-sectional area of the conductive handle is small, which causes the internal resistance of the battery to be large, if the battery is charged and discharged with large current, the temperature of the conductive handle part is easy to rise, which affects the performance of the battery consistency, and there is a risk of failure. The other is to weld and connect through the edge of the liquid injection hole of the pole and the protruding part of the busbar. Since the diameter of the pole itself is small, the diameter of the liquid injection hole is smaller, and the circumference of the liquid injection hole is smaller, which determines that the welding area between the pole and the busbar is also smaller, which will also increase the internal resistance of the battery, which will easily lead to temperature rise at the welding position, and there is a risk of failure. Therefore, the inventor considers designing the pole into a sheet shape, and the busbar is welded with the pole, therefore, how to design a busbar which is convenient to directly and closely welded with the pole becomes a problem to be solved. SUMMARY

[0004] In view of the above technical problems of the prior art, the technical problem to be solved by the utility model is to provide a busbar structure and a cylindrical battery with reasonable structure design, which is convenient to closely weld with the pole, is conducive to increasing the welding area and reducing the internal resistance of the battery.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A power type cylindrical battery busbar structure, comprising a busbar body in a whole circular shape, the middle part of the busbar body has a welding boss formed by whole drawing, the diameter of the welding boss matches the diameter of the pole to be matched, the side wall of the welding boss has a flow hole arranged through in the radial direction, and a plurality of flow holes are arranged along the circumference of the welding boss.

[0007] With the above structure, the welding boss is formed by whole drawing in the middle part of the busbar body, which is convenient for the pole to be closely welded with the welding boss. Since the diameter of the welding boss matches the diameter of the pole, the welding area can be increased, which is conducive to reducing the internal resistance and temperature rise speed, and reducing the risk of battery failure. In addition, the flow holes are arranged on the side wall of the welding boss, which can allow the electrolyte to pass through the flow holes, and the electrolyte can be conveniently filled.

[0008] Furthermore, the diameter of the welding boss is 1.5 to 2 times the diameter of the center hole of the battery core.

[0009] In this way, the welding area between the busbar and the core tab can be increased while ensuring the welding area between the busbar and the core tab.

[0010] Furthermore, the manifold body has a through-flow groove that extends radially along the manifold body.

[0011] Furthermore, one end of the flow channel extends to the welding boss and is connected to one of the flow holes.

[0012] Furthermore, the other end of the flow channel has a weakening groove extending circumferentially to both sides.

[0013] In this way, the manifold body is divided into multiple regions by the flow channels and the damping channels, allowing each region to have better deformation capacity so that it can better fit the core electrode tabs for welding, ensuring the reliability of the welding. At the same time, the flow channels and damping channels also facilitate the flow of electrolyte.

[0014] A cylindrical battery includes a casing with one end open, and a power-type cylindrical battery busbar structure as described above; the other end of the casing has an annular end plate extending radially inward, and the annular end plate has concentrically arranged electrode plates in the middle, the electrode plates being insulatedly and sealed to the annular end plate; a welding boss faces the electrode plate and is fitted and welded to the electrode plate.

[0015] Furthermore, an annular rivet is provided between the electrode plate and the annular end plate. The cross-section of the rivet is in the shape of an "I" and it is riveted to the electrode plate and the annular end plate respectively. An insulating pad is provided between the rivet and the annular end plate.

[0016] Furthermore, the first insulating element includes a first insulating pad disposed on the inner side of the annular end plate, and a first flange protruding from the middle of the first insulating pad and engaging with the inner hole of the annular end plate; the outer side of the annular end plate has a first insulating ring in the shape of an annulus, and the inner side of the first insulating ring is connected to the first flange.

[0017] Furthermore, the outer diameter of the first insulating pad matches the inner diameter of the housing.

[0018] In this way, the first insulating pad can form an insulation barrier between the busbar and the housing, preventing short circuits.

[0019] In summary, the power-type cylindrical battery busbar structure and cylindrical battery of this utility model have advantages such as reasonable structural design, convenient welding with the terminal post, which helps to increase the welding area and reduce the internal resistance of the battery. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0021] Figure 2 for Figure 1 A cross-sectional structural diagram.

[0022] Figure 3 for Figure 2 A partially enlarged structural diagram.

[0023] Figure 4 This is a schematic diagram of the positive electrode busbar. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the embodiments.

[0025] In practical implementation: such as Figures 1-4 As shown, a cylindrical battery includes a casing 1 with one end open. Inside the casing 1, a positive electrode busbar, a winding core, a negative electrode busbar, and a cover plate are sequentially arranged along the direction of the opening. The other end of the casing 1 has an annular end plate 11 extending radially inward. The annular end plate 11 has a concentrically arranged electrode plate 2 in the middle, and the electrode plate 2 is insulatedly and sealed to the annular end plate 11. The positive electrode busbar 3 is arranged inside the electrode plate 2. The positive electrode busbar 3 includes a generally circular busbar body 31. The middle of the busbar body 31 has a welding boss 32 formed by drawing the entire surface towards the electrode plate 2. The diameter of the welding boss 32 matches the diameter of the electrode plate 2 and is welded to the electrode plate 2 in a close fit.

[0026] The welding boss 32 has radially penetrating flow holes 33 on its sidewall, with multiple flow holes distributed circumferentially along the welding boss 32. Simultaneously, the manifold body 31 has a penetrating flow groove 34 extending radially along the manifold body 31. One end of the flow groove 34 extends to the welding boss 32 and connects to one of the flow holes 33, while the other end has a circumferentially extending, two-sided weakening groove 35. In this way, the manifold body is divided into multiple regions by the flow groove and the weakening groove, allowing each region to have better deformation capacity, thus enabling better contact with the core electrode tabs for welding and ensuring welding reliability. At the same time, the flow groove and the weakening groove also facilitate the flow of electrolyte.

[0027] In this embodiment, the diameter of the welding boss 32 is 1.5 to 2 times the diameter of the center hole of the battery core. This ensures that the welding area between the busbar and the core tab is maintained while increasing the welding area between the electrode plate and the busbar.

[0028] An annular riveting piece 4 is provided between the electrode plate 2 and the annular end plate 11. The cross-section of the riveting piece 4 is "I"-shaped, and it is riveted to the electrode plate 2 and the annular end plate 11 respectively. An insulating pad with a first insulating element is provided between the riveting piece 4 and the annular end plate 11, and an insulating pad with a second insulating element is provided between the riveting piece 4 and the electrode plate 2. The first insulating element includes a first insulating pad 12 disposed on the inner side of the annular end plate 11. A first flange protruding from the middle of the first insulating pad 12 is provided to mate with the inner hole of the annular end plate 11. The outer diameter of the first insulating pad 12 matches the inner diameter of the housing 1. The first insulating pad can form an insulating barrier between the busbar and the housing to avoid short circuits. The outer side of the annular end plate 11 has an annular first insulating ring 13, and the inner side of the first insulating ring 13 is connected to the first flange. The second insulating element includes a second insulating pad 14 disposed on the inner side of the electrode 2. The outer edge of the second insulating pad 14 is provided with a second flange that cooperates with the edge of the electrode 2. The outer side of the electrode 2 has a second insulating ring 15 in the shape of an annular ring. The outer diameter of the second insulating ring 15 is consistent with the outer diameter of the second insulating pad 14 and is connected to the second flange.

[0029] The outer diameter of the first insulating ring 13 matches the outer diameter of the riveting piece 4 and has an outwardly protruding flange; the inner diameter of the second insulating ring 15 matches the inner diameter of the riveting piece 4 and has an outwardly protruding inner flange, the heights of the outer and inner flanges matching the protrusion height of the riveting piece 4. The first insulating ring 13 and the second insulating ring 15 are made of PPS plastic; the first insulating pad 12 and the second insulating pad 14 are made of fluororubber.

[0030] In this embodiment, the cylindrical battery has a welding boss that is welded to the electrode plate, thereby increasing the welding area between the electrode plate and the busbar. The welding boss itself is formed by deep drawing, and its edge also has a large flow area with the busbar body, which can reduce internal resistance and temperature rise rate, reduce the risk of battery failure, and improve battery performance.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A power cylindrical battery busbar structure, characterized by, The device includes a circular manifold body (31), with a welding boss (32) integrally drawn in the middle of the manifold body (31). The diameter of the welding boss (32) matches the diameter of the pole to be fitted. The side wall of the welding boss (32) has a through-hole (33) arranged radially, and multiple through-holes are arranged circumferentially along the welding boss (32).

2. The power-type cylindrical battery tab structure of claim 1, wherein, The diameter of the welding boss (32) is 1.5 to 2 times the diameter of the center hole of the battery core.

3. The power-type cylindrical battery tab structure of claim 1, wherein, The manifold body (31) has a through-flow groove (34) that extends radially along the manifold body (31).

4. The power-type cylindrical battery tab structure of claim 3, wherein, One end of the flow channel (34) extends to the welding boss (32) and is connected to one of the flow holes (33).

5. The power-type cylindrical battery tab structure of claim 4, wherein, The other end of the flow channel (34) has a weakening groove (35) that extends circumferentially to both sides.

6. A cylindrical battery, characterized by The device includes a housing (1) with one end open, and a power-type cylindrical battery busbar structure as described in any one of claims 1 to 5; the other end of the housing (1) has an annular end plate (11) extending radially inward, and the annular end plate (11) has a concentrically arranged electrode plate (2) in the middle, the electrode plate (2) being insulatedly and sealed to the annular end plate (11); the welding boss (32) faces the electrode plate (2) and is welded to the electrode plate (2).

7. The cylindrical battery of claim 6, wherein the positive electrode is a lithium cobalt oxide electrode. The electrode plate (2) and the annular end plate (11) have an annular rivet piece (4), the cross section of the rivet piece (4) is in the shape of "I", and it is riveted to the electrode plate (2) and the annular end plate (11) respectively; the insulating mat between the rivet piece (4) and the annular end plate (11) is provided with a first insulating element.

8. The cylindrical battery of claim 7, wherein the positive electrode is a lithium cobalt oxide electrode. The first insulating element includes a first insulating pad (12) disposed on the inner side of the annular end plate (11), and a first flange protruding from the middle of the first insulating pad (12) and engaging with the inner hole of the annular end plate (11); the outer side of the annular end plate (11) has a first insulating ring (13) in the shape of an annulus, and the inner side of the first insulating ring (13) is connected to the first flange.

9. The cylindrical battery of claim 8, wherein the positive electrode is a lithium cobalt oxide electrode. The outer diameter of the first insulating pad (12) matches the inner diameter of the housing (1).

Images