Shell assembly of cylindrical battery

Abstract

The utility model discloses a shell component of a cylindrical battery, which comprises a shell and a confluence plate, one end of the shell is provided with a polar plate which is coaxially arranged in an insulating manner, the middle part of the polar plate is provided with a liquid injection hole which is concentrically arranged in a penetrating manner, and the inner diameter of the liquid injection hole is larger than 1 / 4 of the diameter of the shell; the flow collecting disc comprises a circular flow collecting disc, a welding ring formed in a protruding mode is coaxially arranged on one side of the flow collecting disc, the outer diameter of the welding ring is matched with the inner diameter of the liquid injection hole, and the welding ring is welded to the liquid injection hole in a matched mode; a first overflowing groove is formed in the flow collecting disc in a penetrating mode, and the first overflowing groove is located in the welding ring. The utility model has the advantages that the structural design is reasonable, the over-current area between the confluence plate and the pole can be increased, the internal resistance of the battery can be reduced, and the battery performance can be improved.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical lithium battery technology, and in particular to a cylindrical battery casing assembly. Background Technology

[0002] Currently, with the rapid development of the new energy industry, society has further increased its requirements for the energy density, safety performance, and fast charging performance of lithium-ion batteries. As a widely recognized solution, large cylindrical batteries are ushering in a broad market space.

[0003] There are two main welding methods for connecting the terminals and the busbar of existing cylindrical batteries. One method uses a conductive shank for welding. However, the small cross-sectional area of ​​the conductive shank results in high internal resistance of the battery. If the battery is charged and discharged at high current, the temperature of the conductive shank can easily rise, affecting the battery's consistency and posing a risk of failure. The other method involves welding the edge of the electrolyte filling hole of the terminal to the protrusion of the busbar. Due to the small diameter of the terminal itself, the diameter of the electrolyte filling hole is even smaller, and the circumference of the filling hole is also small. This results in a smaller welding area between the terminal and the busbar, which also increases the battery's internal resistance and easily leads to a high temperature rise at the welding point, posing a risk of failure. Utility Model Content

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is: how to provide a housing assembly with a reasonable structural design that can increase the flow area between the busbar and the terminal post, thereby reducing the internal resistance of the battery and improving the battery performance.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A cylindrical battery casing assembly includes a casing and a manifold. One end of the casing has a coaxially insulated electrode plate, and the middle of the electrode plate has a concentrically through-hole for liquid injection. The inner diameter of the liquid injection hole is greater than 1 / 4 of the diameter of the casing. The manifold includes a circular collector plate, and one side of the collector plate has a protruding welding ring coaxially formed thereon. The outer diameter of the welding ring matches the inner diameter of the liquid injection hole and is welded to the liquid injection hole. The collector plate has a through-hole first flow groove located inside the welding ring.

[0007] With the above structure, since the inner diameter of the injection hole is larger than 1 / 4 of the shell diameter, and the welding ring is welded to the injection hole, the welding gap between the two can be increased, reducing internal resistance and temperature rise rate, lowering the risk of battery failure, and improving battery performance. Furthermore, placing the first flow channel inside the welding ring allows the injected electrolyte to flow from the first flow channel into the core. On the other hand, by retaining a current collector inside the welding ring, the current collector can completely cover the end face of the core, thus providing sufficient welding area between the core and the current collector to ensure the flow area between them.

[0008] Furthermore, the first flow channel extends radially along the flow collecting plate and is provided in multiple circumferentially distributed forms.

[0009] Furthermore, the center of the collector plate has a concentric through-hole, the diameter of which matches the inner diameter of the core hole of the core to be assembled.

[0010] Since the core hole portion of the winding core does not need to be welded to the current collector, setting a center hole can speed up the injection of electrolyte and reduce material usage, thus lowering the battery weight.

[0011] Furthermore, one end of the first flow channel extends into the central hole.

[0012] In this way, the edge of the central hole is divided into multiple independent pieces by the first flow groove, which allows the pieces to fit better onto the tabs of the core, making the welding more reliable.

[0013] Furthermore, the collector plate has a second flow groove extending circumferentially, the second flow groove is located inside the welding ring, and multiple second flow grooves are evenly distributed circumferentially, the second flow grooves being close to the welding ring.

[0014] In this way, the electrolyte can flow into the core from the position near the welding ring through the second flow channel, thereby allowing the electrolyte to be dispersed into the core more quickly.

[0015] Furthermore, the collector plate has a third flow groove extending radially, the third flow groove being located outside the welding ring, and multiple of them being evenly distributed circumferentially.

[0016] Furthermore, the welding ring has radially through-holes, and multiple through-holes are evenly distributed along the circumference of the welding ring.

[0017] This allows the electrolyte to flow from the outside of the welded ring in the flow channel and from the third flow groove into the core.

[0018] Furthermore, one end of the housing has an inwardly extending annular end plate, the diameter of which matches the inner diameter of the annular end plate, and is connected to the annular end plate by an insulating element.

[0019] Furthermore, an annular cover plate is welded to one end of the housing, the diameter of the electrode plate matches the inner diameter of the cover plate, and the electrode plate is connected to the cover plate by an insulating component.

[0020] Furthermore, the insulating element is a rivet piece riveted in a ring shape to the electrode plate, and an insulating sheet is provided between the rivet piece and the electrode plate.

[0021] In summary, this utility model has the advantages of reasonable structural design, which can increase the flow area between the busbar and the terminal post, thereby reducing the internal resistance of the battery and improving battery performance. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this embodiment.

[0023] Figure 2 for Figure 1 A cross-sectional structural diagram.

[0024] Figure 3 for Figure 2 A magnified view of a portion of the image.

[0025] Figure 4 This is a schematic diagram showing the exploded structure of the cover plate and the manifold.

[0026] Figure 5 This is a schematic diagram of the busbar structure. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the embodiments.

[0028] In practical implementation: such as Figures 1-5 As shown, a cylindrical battery casing assembly includes a casing 1 and a manifold 2. One end of the casing 1 has a coaxially insulated electrode plate 3, and the middle of the electrode plate 3 has a concentrically through-hole for liquid injection. The inner diameter of the liquid injection hole is greater than 1 / 4 of the diameter of the casing 1. The manifold 2 includes a circular collector plate 21. A protruding welding ring 22 is coaxially disposed on one side of the collector plate 21. The outer diameter of the welding ring 22 matches the inner diameter of the liquid injection hole and is welded to the liquid injection hole. A sealing plate is welded to the liquid injection hole. The collector plate 21 has a through-hole first flow groove 23 located inside the welding ring 22.

[0029] The first flow channel 23 extends radially along the current collector 21 and has multiple channels evenly distributed circumferentially. The current collector 21 has a central hole 24 concentrically arranged in the middle, the diameter of which matches the inner diameter of the core hole of the core to be assembled. Since the core hole portion of the core does not need to be welded to the current collector, the central hole can accelerate the injection of electrolyte and reduce material usage, thus lowering the battery weight.

[0030] In this embodiment, the first flow channel 23 extends into the center hole 24 at one end facing the center hole 24. This divides the edge of the center hole into multiple independent pieces via the first flow channel, allowing the pieces to better fit onto the tabs of the core, resulting in more reliable welding.

[0031] The collector plate 21 has a second flow channel 25 extending circumferentially. The second flow channel 25 is located inside the welding ring 22, and multiple second flow channels 25 are evenly distributed circumferentially. The second flow channel 25 is close to the welding ring 22. The second flow channel allows the electrolyte to flow into the core from the position near the welding ring, thereby allowing the electrolyte to disperse into the core more quickly.

[0032] The collector plate 21 has a third flow groove 26 extending radially, located outside the welding ring 22, and multiple such grooves are evenly distributed circumferentially. Simultaneously, the welding ring 22 has multiple radially penetrating flow holes 27 evenly distributed circumferentially. This allows the electrolyte to flow from the outside of the welding ring through the flow holes and into the core via the third flow groove.

[0033] In this embodiment, an annular cover plate is welded to one end of the housing 1. The diameter of the electrode plate 3 matches the inner diameter of the cover plate, and the electrode plate 3 is connected to the cover plate via an insulating component. The insulating component is a riveting piece 4 riveted annularly to the electrode plate 3, with an insulating sheet placed between the riveting piece 4 and the electrode plate 3. In a specific implementation, the electrode plate 3 can also be connected to the housing 1 using the following structure: one end of the housing 1 has an inwardly extending annular end plate, the diameter of the electrode plate 3 matches the inner diameter of the annular end plate, and the electrode plate 3 is connected to the annular end plate via an insulating component.

[0034] In the housing assembly of this embodiment, since the inner diameter of the injection hole is larger than 1 / 4 of the housing diameter, and the welding ring is welded to the injection hole, the welding gap between the two can be increased, reducing internal resistance and temperature rise rate, lowering the risk of battery failure, and improving battery performance. Furthermore, placing the first flow channel within the welding ring allows the injected electrolyte to flow from the first flow channel into the core. On the other hand, by retaining a current collector within the welding ring, the current collector can completely cover the end face of the core, thus providing sufficient welding area between the core and the current collector to ensure the flow area between them.

[0035] 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 casing assembly for a cylindrical battery, characterized in that, The device includes a housing (1) and a manifold (2). One end of the housing (1) has a coaxially insulated electrode plate (3). The middle part of the electrode plate (3) has a concentrically through-hole for injection. The inner diameter of the injection hole is greater than 1 / 4 of the diameter of the housing (1). The manifold (2) includes a circular collecting plate (21). One side of the collecting plate (21) has a protruding welding ring (22). The outer diameter of the welding ring (22) matches the inner diameter of the injection hole and is welded to the injection hole. The collecting plate (21) has a through-hole first flow groove (23) located inside the welding ring (22).

2. The casing assembly of the cylindrical battery as described in claim 1, characterized in that, The first flow channel (23) extends radially along the flow collecting plate (21) and is provided in multiple circumferentially distributed.

3. The casing assembly of the cylindrical battery as described in claim 2, characterized in that, The collector plate (21) has a central hole (24) arranged concentrically through the middle, and the diameter of the central hole (24) matches the inner diameter of the core hole of the core to be assembled.

4. The casing assembly of the cylindrical battery as described in claim 3, characterized in that, The first flow channel (23) extends into the center hole (24) at one end facing the center hole (24).

5. The casing assembly of the cylindrical battery as claimed in claim 1, characterized in that, The collector plate (21) has a second flow groove (25) extending circumferentially. The second flow groove (25) is located inside the welding ring (22) and is evenly distributed in multiple places along the circumferential direction. The second flow groove (25) is close to the welding ring (22).

6. The casing assembly of the cylindrical battery as claimed in claim 1, characterized in that, The flow collector (21) has a third flow groove (26) extending radially. The third flow groove (26) is located outside the welding ring (22) and is evenly distributed in multiple places along the circumference.

7. The casing assembly of the cylindrical battery as described in claim 6, characterized in that, The welding ring (22) has a through hole (27) arranged radially through it, and multiple through holes (27) are evenly distributed along the circumference of the welding ring (22).

8. The casing assembly of the cylindrical battery as claimed in claim 1, characterized in that, One end of the housing (1) has an inwardly extending annular end plate, the diameter of the electrode plate (3) matches the inner diameter of the annular end plate, and is connected to the annular end plate by an insulating element.

9. The casing assembly of the cylindrical battery as claimed in claim 1, characterized in that, One end of the housing (1) is welded with an annular cover plate, the diameter of the electrode plate (3) matches the inner diameter of the cover plate, and is connected to the cover plate by an insulating component.

10. The housing assembly of the cylindrical battery as claimed in claim 8 or 9, characterized in that, The insulating component is a rivet (4) that is annularly riveted to the electrode plate (3), and an insulating sheet is provided between the rivet (4) and the electrode plate (3).

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