Pole structure, cover plate assembly and cylindrical battery

Abstract

The utility model discloses a kind of pole structure, cover plate assembly and cylindrical battery, pole structure is T-shaped structure, including head and the tail of column body arranged below head, the bottom surface of the tail of column body is equipped with plug, the plug is used in cooperation with socket arranged on current collector, the lower side of the head is also equipped with multiple clamping hooks, multiple clamping hooks are spaced distribution along the circumferential direction of tail of column body, gap is equipped between the clamping hook and tail of column body, the clamping hook is used to pass through the pole mounting hole on cover plate and hook cover plate. Advantageous effect: the utility model pole structure is inserted with current collector, without welding, pole structure is fixed with cover plate through clamping hook, cylindrical battery non-pole end of cell tab is directly welded with shell, welding frequency is less in battery assembly process, process flow is simplified, reduce manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical battery technology, specifically to an electrode structure, a cover plate assembly, and a cylindrical battery. Background Technology

[0002] Lithium-ion batteries are widely used in portable electronic devices and electric vehicles. Cylindrical batteries, especially large cylindrical batteries, have attracted widespread attention due to their high energy density, excellent fast-charging performance, good thermal stability, and potential cost advantages. Currently, cylindrical batteries are typically manufactured by winding positive electrode sheets, negative electrode sheets, and a separator into a core, then flattening the positive and negative tabs, followed by welding the positive and negative current collectors, terminals, and cover plate. At least one end of the cylindrical battery has a terminal structure. In existing cylindrical battery manufacturing processes, the current collectors and terminals are usually connected by welding. During the assembly of cylindrical batteries, multiple laser welding processes are involved, which can easily lead to issues such as incomplete welds and weld spatter. Multiple welding operations further increase the probability of these problems, affecting the welding yield. Furthermore, existing technologies also integrate the terminals and cover plate into one unit. For this integrated terminal and cover plate structure, an ultrasonic torque welding head needs to be inserted into the battery to weld the terminals and current collectors, which is difficult and can easily leave welding slag inside the battery, affecting its safety performance. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a terminal structure, a cover plate assembly, and a cylindrical battery. The terminal structure is inserted into the current collector without welding. The terminal structure and the cover plate are fixed by hooks. The cell tabs at the non-terminal ends of the cylindrical battery are directly welded to the casing. During battery assembly, the number of welding operations is reduced, the process is simplified, and the manufacturing cost is reduced.

[0004] The purpose of this utility model is achieved through the following technical measures: a pole post structure, the pole post structure is a T-shaped structure, including a head and a column tail located below the head, the bottom surface of the column tail is provided with a plug, the plug is used in conjunction with a socket provided on a collector plate, the lower part of the head is also provided with multiple hooks, the multiple hooks are distributed at intervals along the circumference of the column tail, the hooks are provided with a gap between the hooks and the column tail, the hooks are used to pass through the pole post mounting holes on the cover plate and hook the cover plate.

[0005] In some embodiments, the hook includes a connecting arm and a hook body, and a gap of 0.1-0.5 mm is provided between the connecting arm and the outer side wall of the tail of the column.

[0006] In some embodiments, the angle between the bottom surface of the hook and the wall surface of the connecting arm is 60-75°.

[0007] In some embodiments, the connection between the bottom surface of the hook and the wall surface of the connecting arm is rounded.

[0008] In some embodiments, the electrode structure is further provided with a liquid injection channel.

[0009] A cover plate assembly includes a cover plate and the aforementioned pole structure. The cover plate has pole mounting holes, and an insulating sheet is integrated on the bottom surface of the cover plate. The hook and the tail of the pole structure are inserted into the pole mounting holes. The hook hooks the insulating sheet, and a sealing ring is provided between the pole structure and the cover plate.

[0010] In some embodiments, the sealing ring is further provided with a limiting ring, and the top surface of the cover plate is provided with a limiting groove, into which the limiting ring is inserted.

[0011] A cylindrical battery includes a casing with one open end, a battery cell disposed inside the casing, a current collector, and a cover plate assembly. One end of the battery cell is connected to the current collector, and the other end of the battery cell is connected to the sealed end of the casing. The current collector has an injection hole and a socket. A plug is inserted into the socket, and the cover plate is connected to the open end of the casing.

[0012] In some embodiments, the socket includes two opposingly bent retaining strips forming a slot between the two retaining strips, and the plug includes a plug post.

[0013] Compared with existing technologies, the beneficial effects of this utility model are as follows: This utility model proposes an electrode post structure, a cover plate assembly, a cylindrical battery, and an assembly method for the cylindrical battery. It changes the traditional connection method of welding the current collector and the electrode post. The electrode post structure is connected to the current collector via a plug and socket, reducing the number of welding operations and lowering the probability of problems such as incomplete welds and solder joints. The electrode post structure is fixed to the cover plate via hooks, allowing the electrode post structure and the cover plate to be integrated into a cover plate assembly, forming a modular structure. When closing the cover, the electrode post structure is directly connected to the current collector without welding, making operation convenient. The core tabs at the non-electrode post ends of the cylindrical battery are directly welded to the casing, eliminating the need for a current collector. During battery assembly, the number of welding operations is reduced, the process is simplified, and manufacturing costs are lowered.

[0014] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the pole structure.

[0016] Figure 2 This is a structural diagram of the cover plate assembly and the collector plate.

[0017] Figure 3 yes Figure 2 A magnified view of A in the middle.

[0018] Figure 4 This is a schematic diagram of the collector plate.

[0019] Figure 5 This is a structural schematic diagram of the cover plate assembly.

[0020] Figure 6 This is a schematic diagram of a cylindrical battery.

[0021] Among them, 1. Head, 2. Tail of column, 3. Insert post, 4. Hook, 5. Injection channel, 6. Cover plate, 7. Insulating sheet, 8. Sealing ring, 9. Collector plate, 10. Connecting arm, 11. Hook body, 12. Bottom surface of hook body, 13. Locking strip, 14. Housing, 15. Battery cell. Detailed Implementation

[0022] like Figures 1 to 6 As shown, an electrode post structure is T-shaped, including a head 1 and a tail 2 located below the head 1. Specifically, the diameter of the head 1 is larger than the diameter of the tail 2. A plug is provided on the bottom surface of the tail 2, which works in conjunction with a socket on a collector plate 9. Specifically, the plug can be inserted into the socket on the collector plate 9. Further, there are multiple plugs, preferably two. Multiple hooks 4 are also provided below the head 1, spaced apart along the circumference of the tail 2. Further, there are four hooks 4. A gap is provided between the hooks 4 and the tail 2, allowing the hooks 4 to pass through electrode post mounting holes on a cover plate 6 and hook onto the cover plate 6. Specifically, the gap provides space for the elastic deformation of the hooks 4. When the hook 4 is subjected to a squeezing force in the direction of the tail 2 of the column, the hook 4 deforms and shifts towards the side wall of the tail 2 of the pole column. When the squeezing force is released, the hook 4 can return to its initial position by its own elasticity.

[0023] In some embodiments, the hook 4 includes a connecting arm 10 and a hook body 11. A gap of 0.1-0.5 mm is provided between the connecting arm 10 and the outer wall of the tail portion 2 of the column. The gap provides space for the elastic deformation of the hook 4, preventing the hook 4 from being unable to bend or from breaking due to stress concentration because of the lack of a gap.

[0024] In some embodiments, the angle θ between the bottom surface 12 of the hook body and the wall surface of the connecting arm 10 is 60-75°. The bottom surface 12 of the hook body slopes downward and intersects with the wall surface of the connecting arm 10. When the hook body 11 is inserted, the bottom surface 12 of the hook body serves as a guide surface, which can both guide and facilitate the pressing of the hook 4 by the side wall of the pole mounting hole on the cover plate 6.

[0025] In some embodiments, the bottom surface 12 of the hook body is rounded at the connection with the wall surface of the connecting arm 10 to prevent the hook 4 from having a sharp point, thereby preventing damage to the sealing ring 8 when inserted.

[0026] In some embodiments, the electrode structure further includes an injection channel 5. Specifically, the injection channel 5 extends axially through the head 1 and the tail 2 of the column.

[0027] A cover plate assembly includes a cover plate 6 and the aforementioned pole post structure. The cover plate 6 has pole post mounting holes, and an insulating sheet 7 is integrated on the bottom surface of the cover plate 6. The insulating sheet 7 is used to insulate the cover plate 6 from the current collector 9. The hook 4 and the tail 2 of the pole post structure are inserted into the pole post mounting holes. The hook 4 hooks the insulating sheet 7. A sealing ring 8 is also provided between the pole post structure and the cover plate 6. Specifically, when assembling the cover plate assembly, the lower part of the sealing ring 8 is first inserted into the pole post mounting holes of the cover plate 6. Then, the pole structure is inserted into the sealing ring 8. During insertion, the sealing ring 8 and the cover plate 6 will squeeze the hook 4, causing the hook 4 to deform under force. The hook 4 will shift towards the tail 2 of the pole. When the hook body 11 of the hook 4 extends to the bottom of the sealing ring 8 and the insulating sheet 7, the hook 4 is released from force and resets under its own elasticity. This allows the hook body 11 of the hook 4 to hook the bottom surface of the insulating sheet 7. The sealing ring 8, the cover plate 6 and the insulating sheet 7 are clamped between the head 1 and the hook body 11, thus achieving the fixation and insulation seal between the pole structure and the cover plate 6.

[0028] It should be noted that this utility model does not specifically limit the integration method of the cover plate 6 and the insulating sheet 7. Methods known to those skilled in the art can be used. Preferably, the insulating sheet 7 and the cover plate 6 are integrated by adhesive bonding.

[0029] In some embodiments, the sealing ring 8 is further provided with a limiting ring, and the top surface of the cover plate 6 is provided with a limiting groove, into which the limiting ring is inserted. The limiting ring and the limiting groove are used to position the sealing ring 8 and the cover plate 6. At the same time, when the pole post structure is inserted into the sealing ring 8, the limiting ring is inserted into the limiting groove, and the cover plate 6 can also play a certain role in fixing the sealing ring 8.

[0030] A cylindrical battery includes a casing 14 with one open end, a battery cell 15 disposed inside the casing 14, a current collector 9, and a cover plate assembly. One end of the battery cell 15 is welded to the current collector 9, and the other end of the battery cell 15 is welded to the sealed end of the casing 14. Specifically, to facilitate welding of the casing 14 and the battery cell 15's tabs, preferably, a welding area recessed towards the inside of the casing 14 is provided at the sealed end of the casing 14. The current collector 9 has a liquid injection hole; specifically, to facilitate liquid injection, preferably, the liquid injection hole communicates with a liquid injection channel 5. The current collector 9 has a socket, into which a plug is inserted. The cover plate 6 is welded to the open end of the casing 14.

[0031] In some embodiments, the socket includes two opposing bent retaining strips 13, forming a slot between the two retaining strips 13, and the plug includes a pin 3. When the pin 3 is inserted into the slot, it can be clamped by the two opposing bent retaining strips 13. Further, the socket and the current collector 9 are integrally formed. Preferably, the current collector 9 and the socket are integrally formed by stamping. Further, the depth of the slot is 1-5 mm, and the length of the plug matches the depth of the slot.

[0032] It should be noted that the present invention does not limit the structure of the socket and plug to two opposing bent retaining strips 13 and inserts 3. It can adopt a structure that can achieve plugging, which is well known to those skilled in the art. For example, a male and female connector. When the socket is a male connector, the plug is a female connector. When the socket is a female connector, the plug is a male connector. The male connector has pins and the female connector has a socket.

[0033] A method for assembling a cylindrical battery, the method being based on the cylindrical battery, comprising the following steps: Step 1: The positive electrode, negative electrode, and separator are wound together, and the tabs are flattened after winding to obtain cell 15. It should be noted that the winding and flattening operations are performed using existing conventional methods well known to those skilled in the art.

[0034] Step 2: Laser-through welding is performed on the tabs on the top of the current collector 9 and the battery cell 15 to connect the battery cell 15 and the current collector 9.

[0035] Step 3: Place the battery cell 15 with the current collector 9 welded on into the housing 14, and place the current collector 9 at the open end of the housing 14.

[0036] Step 4: Integrate the cover plate 6 and the insulating sheet 7 into one piece, insert the limiting ring into the limiting groove, position the sealing ring 8 and the cover plate 6, and insert the pole structure into the sealing ring 8 and the cover plate 6 so that the hook 4 hooks the insulating sheet 7.

[0037] Step 5: Insert the plug of the pole structure into the socket on the collector plate 9, and perform laser sealing welding on the cover plate 6 and the open end of the housing 14.

[0038] Step 6: Laser-through welding is performed on the bottom of the housing 14 and the tab of the battery cell 15.

[0039] Step 7: Baking and liquid injection are performed. After liquid injection, the liquid injection channel 5 of the electrode structure is sealed and welded using sealing nails. The battery is then subjected to capacity testing to obtain a cylindrical battery.

[0040] In some embodiments, in step 4, after the pole structure and the cover plate 6 are fixed, sealant is used to fill the gap between the pole structure and the cover plate 6 to further fix the pole structure and the cover plate 6, and at the same time, it can further improve the sealing between the pole structure and the cover plate 6.

[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0042] Furthermore, in the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A pole post structure, characterized in that: The pole structure is T-shaped, including a head and a tail section located below the head. The bottom surface of the tail section is provided with a plug, which is used in conjunction with a socket on the collector plate. The head is also provided with multiple hooks, which are spaced apart along the circumference of the tail section. There is a gap between the hooks and the tail section. The hooks are used to pass through the pole mounting holes on the cover plate and hook onto the cover plate.

2. The pole post structure according to claim 1, characterized in that: The hook includes a connecting arm and a hook body. A gap of 0.1-0.5 mm is provided between the connecting arm and the outer side wall of the tail of the column.

3. The pole post structure according to claim 2, characterized in that: The angle between the bottom surface of the hook and the wall surface of the connecting arm is 60-75°.

4. The pole post structure according to claim 3, characterized in that: The bottom surface of the hook body is rounded at the connection with the wall surface of the connecting arm.

5. The pole post structure according to claim 1, characterized in that: The electrode structure is also provided with a liquid injection channel.

6. A cover plate assembly, characterized in that: The device includes a cover plate and the pole structure as described in any one of claims 1-5. The cover plate has pole mounting holes and an insulating sheet is integrated on the bottom surface of the cover plate. The hook and the tail of the pole structure are inserted into the pole mounting holes. The hook hooks the insulating sheet. A sealing ring is also provided between the pole structure and the cover plate.

7. The cover plate assembly according to claim 6, characterized in that: The sealing ring is also provided with a limiting ring, and the top surface of the cover plate is provided with a limiting groove, into which the limiting ring is inserted.

8. A cylindrical battery, characterized in that: The device includes a housing with one open end, a battery cell disposed inside the housing, a current collector, and a cover plate assembly as described in claim 6 or 7. The tab at one end of the battery cell is connected to the current collector, and the tab at the other end of the battery cell is connected to the sealed end of the housing. The current collector has a liquid injection hole and a socket. The plug is inserted into the socket, and the cover plate is connected to the open end of the housing.

9. The cylindrical battery according to claim 8, characterized in that: The socket includes two opposing bent retaining strips forming a slot between them, and the plug includes a plug post.

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