Full-tab cylindrical lithium battery and positive collector plate thereof
By setting up a central injection hole and a hollow flow guide in the positive electrode current collecting plate of an all-pole ear cylindrical lithium battery, the problems of poor battery cells and low electrolyte immersion efficiency caused by laser welding are solved, and the battery production pass rate and production efficiency are achieved, and the battery safety is enhanced.
Patent Information
- Application Number
- CN202422101613.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-28
AI Technical Summary
During the charging and discharging process of high current, the local temperature of the battery is too high, resulting in poor battery performance or even failure. The laser-welded positive electrode current collecting disk is prone to dummy welding or welding, causing internal short circuits, affecting battery performance and safety.
A full-pole ear cylindrical lithium battery and its positive electrode current collecting disk are designed, and the electrolyte is poured through the central injection hole set at the center of the current collecting disk body, and a hollow flow guide is vertically arranged below the current collecting disk body to insert the positive end of the battery cell to assist the electrolyte to uniformly infiltrate. This design avoids the adverse phenomenon of laser welding and improves the electrolyte immersion efficiency.
It effectively avoids battery defects caused by laser welding, improves the electrolyte immersion efficiency, improves the battery production pass rate and production efficiency, and enhances the battery safety.
Smart Images
Figure CN223039091U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of the structure of all-pole-ear cylindrical lithium batteries, and particularly relates to an all-pole-ear cylindrical lithium battery and a positive current collector plate thereof. Background Art
[0002] With the process of economic globalization, the energy demand is increasing day by day. Lithium-ion batteries have become a focus in the international new energy field due to their high energy density, high cycle efficiency and other characteristics. Among them, the 18650 cylindrical battery is the most commonly used lithium-ion battery at present. The 18650 cylindrical battery generally adopts a positive and negative single-pole-ear or multi-pole-ear structure. During the large-current charge and discharge process, the current density near the pole ear is too large, and the local temperature of the battery is too high, resulting in poor battery performance and even failure, causing safety problems.
[0003] Compared with single-pole-ear and multi-pole-ear batteries, all-pole-ear structure batteries can effectively reduce the internal resistance of the battery, reduce heat generation, improve battery performance, and improve safety at the same time. At present, the general assembly process of all-pole-ear batteries is to flatten the wound battery core and then connect the current collector plate at both the positive and negative ends by laser welding. However, laser welding often has problems such as false welding or welding through, resulting in problems such as too large internal resistance of the battery or internal short circuit, affecting the battery performance and safety, and increasing the defective rate of products; at the same time, the positive end of the battery core after flattening and welding is not conducive to the infiltration of electrolyte, affecting production efficiency. Summary of the Utility Model
[0004] The purpose of the utility model is to provide an all-pole-ear cylindrical lithium battery and a positive current collector plate thereof, which can avoid battery defects caused by laser welding the positive current collector plate, improve the electrolyte infiltration efficiency at the same time, and improve the battery production qualification rate and production efficiency.
[0005] In order to achieve the above purpose, on the one hand, the utility model provides a positive current collector plate of an all-pole-ear cylindrical lithium battery, and the positive current collector plate includes:
[0006] A current collector plate body, and a central liquid injection hole is arranged in the center of the current collector plate body for injecting electrolyte into the interior of the battery;
[0007] A hollow diversion tube, the hollow diversion tube is vertically arranged below the current collector plate body, and the hollow diversion tubes are radially and uniformly arranged around the central liquid injection hole for vertically inserting into the positive end of the battery core to assist the electrolyte to uniformly infiltrate onto the electrode plate;
[0008] A conductive connection piece, and the conductive connection piece is connected to the current collector plate body.
[0009] Optionally, the lower end of the hollow diversion tube is set to be pointed.
[0010] Optionally, the hollow diversion tube is made of a conductive material.
[0011] Optionally, the inner diameter of the hollow diversion tube is set to 0.8 - 1.2 mm.
[0012] Optionally, the inner diameter of the central liquid injection hole is larger than that of the hollow diversion tube.
[0013] Optionally, a fusing hole is provided at the center of the connection between the current collector plate body and the conductive connection piece.
[0014] Optionally, arc-shaped connection notches are provided on both sides of the connection between the current collector plate body and the conductive connection piece.
[0015] On the other hand, the present utility model further provides a full-tab cylindrical lithium battery, which includes a full-tab cylindrical lithium battery body and a positive current collector plate as described in any one of the above.
[0016] Optionally, the full-tab cylindrical lithium battery body includes:
[0017] A flattened area of the positive current collector foil for inserting the hollow diversion tube so that the current collector plate body is connected to the full-tab cylindrical lithium battery body;
[0018] An unflattened area of the positive current collector foil for preventing excessive insertion of the hollow diversion tube and causing an internal short circuit of the battery.
[0019] Through the above technical solutions, the present utility model provides a full-tab cylindrical lithium battery and its positive current collector plate. Through the central liquid injection hole provided in the center of the current collector plate body, the electrolyte is poured into the interior of the battery. The hollow diversion tubes are vertically arranged below the current collector plate body and are radially and evenly arranged around the central liquid injection hole for vertically inserting into the positive electrode end of the battery core to assist the uniform infiltration of the electrolyte onto the electrode plate. The full-tab cylindrical lithium battery and its positive current collector plate can avoid battery defects caused by laser welding the positive current collector plate, improve the electrolyte immersion efficiency, and improve the battery production qualification rate and production efficiency. Description of the Drawings
[0020] The drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present utility model, but do not constitute a limitation to the embodiments of the present utility model. In the drawings:
[0021] Figure 1 is a schematic structural diagram of a positive current collector plate of a full-tab cylindrical battery according to an embodiment of the present utility model;
[0022] Figure 2It is a schematic structural diagram of the positive current collector disk of a full-tab cylindrical battery inserted into the positive end of a full-tab cylindrical lithium battery cell after winding and flattening.
[0023] Description of Reference Numerals
[0024] 11. Current collector disk body 111. Central liquid injection hole
[0025] 112. Hollow diversion tube 12. Conductive connection piece
[0026] 13. Fuse hole 14. Arc-shaped connection notch
[0027] 21. Positive electrode coating area 221. Flattened area of the positive electrode light foil
[0028] 222. Unflattened area of the positive electrode light foil Detailed Implementation Modes
[0029] The following will describe in detail the specific implementation modes of the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation modes described herein are only for explaining and illustrating the embodiments of the present invention, and are not used to limit the embodiments of the present invention.
[0030] In the embodiments of the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are usually in the directions shown in the drawings or in terms of the vertical, perpendicular or gravitational directions for describing the relative positional relationships of the components.
[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of the technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.
[0032] As Figure 1 shown is a schematic structural diagram of the positive current collector disk of a full-tab cylindrical battery according to an embodiment of the present invention. As Figure 2 shown is a schematic structural diagram of the positive current collector disk of a full-tab cylindrical battery inserted into the positive end of a full-tab cylindrical lithium battery cell after winding and flattening. In this Figure 1In this case, the positive current collector plate may include a current collector plate body 11, a hollow diversion tube 112, and a conductive connection piece 12. Specifically, a central liquid injection hole 111 is provided at the center of the current collector plate body 11 for injecting electrolyte into the interior of the battery. In order to improve the efficiency of the electrolyte infiltrating into the positive electrode end of the battery cell, a hollow diversion tube 112 is vertically provided below the current collector plate body 11, and the hollow diversion tubes 112 are radially and uniformly arranged around the central liquid injection hole 111 for vertically inserting into the positive electrode end of the battery cell to assist the electrolyte to uniformly infiltrate onto the electrode plate. The hollow diversion tubes 112 are vertically arranged below the current collector plate body 11, so that when inserting into the positive electrode end of the battery cell, it is convenient to operate and the force is uniform, and the hollow diversion tubes 112 are not easily broken. The radial and uniform arrangement of the hollow diversion tubes 112 can ensure uniform and close contact between the current collector plate body 11 and the battery cell when inserting. In order to facilitate conduction, the conductive connection piece 12 is connected to the current collector plate body 11. This all-pole-ear cylindrical lithium battery and its positive current collector plate can avoid battery defects caused by laser welding the positive current collector plate, improve the electrolyte infiltration efficiency, and improve the battery production qualification rate and production efficiency.
[0033] In this embodiment, considering that the hollow diversion tube 112 needs to be inserted into the positive electrode end of the battery cell, in order to facilitate the insertion of the hollow diversion tube 112, the lower end of the hollow diversion tube 112 is set to a pointed head. Considering that laser welding the current collector plate is likely to cause battery defects, the material of the hollow diversion tube 112 can also be set as a conductive material, so that the hollow diversion tube 112 can be mechanically connected to the positive electrode end of the battery cell, avoiding problems such as virtual welding and welding through caused by laser welding.
[0034] In this embodiment, the hollow diversion tubes 112 are radially and uniformly arranged in a central pattern on the surface of the current collector plate, facilitating the uniform infiltration of the electrolyte, and can ensure uniform and close contact between the current collector plate body 11 and the positive electrode end of the battery cell when inserting. Considering the size of the current collector plate itself and the need to facilitate the flow of the electrolyte, the inner diameter of the hollow diversion tube 112 can be set to 0.8 - 1.2 mm, with 1.0 mm being the most preferred, and the inner diameter of the central liquid injection hole 111 is larger than the inner diameter of the hollow diversion tube 112.
[0035] In this embodiment, considering the safety problems caused to the battery when the current is too large, a fuse hole 13 is provided at the center of the connection between the current collector plate body 11 and the conductive connection piece 12, and arc-shaped connection notches 14 are provided on both sides of the connection between the current collector plate body 11 and the conductive connection piece 12, so that when the current is too large and the temperature rises sharply at the connection between the current collector plate body 11 and the conductive connection piece 12, the connection between the current collector plate body 11 and the conductive connection piece 12 will melt, preventing safety problems caused by overcurrent.
[0036] On the other hand, the present utility model also provides a full-tab cylindrical lithium battery, and the full-tab cylindrical lithium battery includes a full-tab cylindrical lithium battery body and the positive current collector plate as described in any one of the above. Among them, the positive current collector plate can be as shown in Figure 1 . In this Figure 1 , the positive current collector plate may include a current collector plate body 11, a hollow diversion tube 112, and a conductive connection piece 12. Specifically, a central liquid injection hole 111 is provided in the center of the current collector plate body 11 for injecting electrolyte into the interior of the battery. In order to improve the efficiency of the electrolyte infiltrating into the positive electrode end of the battery cell, a hollow diversion tube 112 is vertically provided below the current collector plate body 11, and the hollow diversion tubes 112 are radially and uniformly arranged around the central liquid injection hole 111 for vertically inserting into the positive electrode end of the battery cell to assist the electrolyte to uniformly infiltrate onto the electrode plate. The hollow diversion tubes 112 are vertically provided below the current collector plate body 11, so that when inserting into the positive electrode end of the battery cell, it is convenient to operate and the force is evenly distributed, and the hollow diversion tubes 112 are not easily broken. The radial and uniform arrangement of the hollow diversion tubes 112 can ensure uniform and close contact between the current collector plate body 11 and the battery cell when inserting. For the convenience of conduction, the conductive connection piece 12 is connected to the current collector plate body 11. The full-tab cylindrical lithium battery and its positive current collector plate can avoid battery defects caused by laser welding the positive current collector plate, improve the electrolyte infiltration efficiency, and improve the battery production qualification rate and production efficiency.
[0037] In this embodiment, considering that the hollow diversion tube 112 needs to be inserted into the positive electrode end of the battery cell, in order to facilitate the insertion of the hollow diversion tube 112, the lower end of the hollow diversion tube 112 is set to a pointed head. Considering that laser welding the current disk is likely to cause battery defects, the material of the hollow diversion tube 112 can also be set as a conductive material, so that the hollow diversion tube 112 can be mechanically connected to the positive electrode end of the battery cell, avoiding problems such as virtual soldering and soldering through caused by laser welding.
[0038] In this embodiment, the hollow diversion tubes 112 are radially and uniformly arranged in a central pattern on the surface of the current collector plate, which is convenient for the electrolyte to uniformly infiltrate, and can ensure uniform and close contact between the current collector plate body 11 and the positive electrode end of the battery cell when inserting. Considering the size of the current collector plate itself and the convenience of electrolyte circulation, the inner diameter of the hollow diversion tube 112 can be set to 0.8 - 1.2 mm, with 1.0 mm being the most preferred, and the inner diameter of the central liquid injection hole 111 is larger than the inner diameter of the hollow diversion tube 112.
[0039] In this embodiment, considering the safety issues of the battery caused by excessive current, a fusing hole 13 is provided at the center of the connection between the current collector plate body 11 and the conductive connecting piece 12, and arc-shaped connection notches 14 are provided on both sides of the connection between the current collector plate body 11 and the conductive connecting piece 12. When the current is too large and the temperature rises sharply, the connection between the current collector plate body 11 and the conductive connecting piece 12 will fuse, preventing safety problems caused by overcurrent.
[0040] In this Figure 2 one, the all-pole-ear cylindrical lithium battery body includes a flattened area 221 of the positive electrode light foil, an unflattened area 222 of the positive electrode light foil, and a positive electrode coating area 21. The flattened area 221 of the positive electrode light foil is used to insert the hollow diversion tube 112 so that the current collector plate body 11 is connected to the all-pole-ear cylindrical lithium battery body. By connecting the current collector plate body 11 and the all-pole-ear cylindrical lithium battery body through the hollow diversion tube 112, problems such as false soldering and welding through caused by laser welding are avoided. The unflattened area 222 of the positive electrode light foil is used to prevent the hollow diversion tube 112 from being inserted too much and causing an internal short circuit of the battery. The pointed end at the lower end of the hollow diversion tube 112 is inserted into the unflattened area 222 of the positive electrode light foil after insertion, avoiding being inserted too much and penetrating into the positive electrode coating area 21 and causing an internal short circuit. At the same time, the outer flattened area 221 of the positive electrode light foil can fix the current collector plate body 11 at the positive end of the battery cell, preventing poor contact.
[0041] Through the above technical solutions, the present utility model provides an all-pole-ear cylindrical lithium battery and its positive current collector plate. Through the central liquid injection hole 111 provided at the center of the current collector plate body 11, the electrolyte is poured into the interior of the battery. The hollow diversion tube 112 is vertically arranged below the current collector plate body 11, and the hollow diversion tube 112 is radially and uniformly arranged around the central liquid injection hole 111 and is used to vertically insert into the positive end of the battery cell to assist the electrolyte to uniformly infiltrate onto the electrode plate. The all-pole-ear cylindrical lithium battery and its positive current collector plate can avoid battery defects caused by laser welding the positive current collector plate, improve the electrolyte immersion efficiency, and improve the battery production qualification rate and production efficiency.
[0042] The preferred embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited thereto. Within the technical concept scope of the present utility model, various simple modifications can be made to the technical solutions of the present utility model. Including any suitable combination of each specific technical feature, in order to avoid unnecessary repetition, the present utility model will not separately describe various possible combination methods. But these simple modifications and combinations should also be regarded as the content disclosed by the present utility model and all fall within the protection scope of the present utility model.
Claims
1. A full-ear cylindrical lithium battery positive electrode collector, characterized in that: The positive electrode current collecting plate comprises: A current collecting plate body, wherein a central liquid injection hole is provided at the center of the current collecting plate body for injecting electrolyte into the interior of the battery; A hollow flow guide tube, which is vertically arranged below the current collecting plate body and radially arranged with the central injection hole as the center, and is used to be vertically inserted into the positive end of the battery cell to assist the electrolyte in evenly infiltrating the electrode sheet; A conductive connecting piece is connected to the current collecting disc body.
2. The positive electrode current collecting disk according to claim 1, characterized in that: The lower end of the hollow flow guide tube is configured as a pointed tip.
3. The positive electrode current collecting disk according to claim 1, characterized in that: The hollow flow guide tube is made of conductive material.
4. The positive electrode current collecting disk according to claim 1, characterized in that: The inner diameter of the hollow flow guide tube is set to 0.8-1.2 mm.
5. The positive electrode current collecting disk according to claim 1, characterized in that: The inner diameter of the central liquid injection hole is larger than the inner diameter of the hollow flow guide tube.
6. The positive electrode current collecting disk according to claim 1, characterized in that: A fuse hole is arranged at the center of the connection between the current collecting disc body and the conductive connecting piece.
7. The positive electrode current collecting disk according to claim 1, characterized in that: Arc-shaped connection gaps are arranged on both sides of the connection between the current collecting plate body and the conductive connecting sheet.
8. A full-ear cylindrical lithium battery, characterized in that: The full-tab cylindrical lithium battery comprises a full-tab cylindrical lithium battery body and a positive electrode current collector as described in any one of claims 1-7.
9. The full-ear cylindrical lithium battery according to claim 8, characterized in that: The full-ear cylindrical lithium battery body comprises: The positive anode foil flattening area is used to insert the hollow flow guide tube so that the collector plate body is connected to the full-ear cylindrical lithium battery body; The unflattened area of the positive anode foil is used to prevent the hollow flow guide tube from being inserted too much and causing an internal short circuit in the battery.