Battery center pin and cylindrical battery

Abstract

The utility model provides a battery center pin and a cylindrical battery, relates to lithium battery technical field, including pin body, pin body peripheral surface equidistantly is provided with a plurality of first bead, said first bead is parallel with pin body axial direction, every two adjacent first bead forms first groove on pin body surface. According to the central needle structure of the battery disclosed by the utility model, electrolyte can quickly permeate into the battery along the first grooves, and compared with the traditional spiral grooves, the design has the advantages that the complexity of a permeation path is reduced, and the electrolyte can reach the central position of the battery more easily. The plurality of parallel first grooves provide a larger surface area, so that the electrolyte can be in full contact with the central pole piece of the battery roll core, thereby improving the permeation efficiency of the electrolyte, ensuring the full infiltration of the central pole piece of the battery, reducing the occurrence of the phenomenon of precipitation of lithium from less liquid, greatly prolonging the cycle life of the battery and greatly improving the overall performance of the battery.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery center needle and a cylindrical battery. Background Art

[0002] The battery center pin is one of the important components of the battery. It is inserted into the interior of the battery roll core to support the outer roll core and prevent the roll core from collapsing and deforming inward.

[0003] The center needle of the existing cylindrical battery is a cylindrical structure with a smooth surface. During the battery cycle, the stress toward the center inside the battery causes the innermost circle electrode in the center of the core to be tightly pressed together with the center needle. The electrolyte at the bottom of the battery is difficult to penetrate into the electrode at the center of the core. The electrode in the center of the core has less liquid and lithium precipitation, resulting in a decrease in the battery cycle performance.

[0004] For example, the patent with announcement number CN210897522U discloses a battery center needle and a cylindrical battery, which improves the electrolyte infiltration effect on the middle of the winding core by setting a groove with an external thread structure on the surface of the needle body. Although this method uses the capillary adsorption capacity of the thread groove to allow the electrolyte to penetrate into the inner ring electrode of the winding core, the groove on the needle body is formed by a whole external thread, and the electrolyte needs to be adsorbed and moved from the bottom to the top along the thread groove, and the infiltration efficiency is low. Utility Model Content

[0005] In view of this, the utility model proposes a battery center needle and a cylindrical battery to improve the efficiency of electrolyte infiltration into the center electrode of the winding core.

[0006] The technical solution of the utility model is achieved in this way:

[0007] In a first aspect, the utility model provides a battery center needle, including a needle body, wherein a plurality of first ridges are arranged at equal intervals on the outer peripheral surface of the needle body, the first ridges are parallel to the axial direction of the needle body, and two adjacent first ridges form a first groove on the surface of the needle body.

[0008] On the basis of the above technical solution, preferably, the length of the first ridge is the same as the length of the needle body.

[0009] Preferably, the thickness of the first ridge is 0.2-2 mm, the width of the first groove is 0.2 mm-1 mm, and the depth of the first groove is 0.2 mm-1 mm.

[0010] As an embodiment, the needle body is a solid cylindrical rod-shaped structure.

[0011] As another embodiment, a through hole is opened at the central axis of the needle body.

[0012] On the basis of the above technical solution, preferably, a plurality of second ridges are arranged at intervals on the inner circumference of the through hole, the second ridges are parallel to the axial direction of the needle body, and two adjacent second ridges form second grooves on the inner surface of the through hole.

[0013] Further, preferably, the second ridge is equal to the first ridge in length.

[0014] Preferably, the thickness of the second ridge is greater than or equal to the thickness of the first ridge, the width of the second groove is greater than or equal to the width of the first groove, and the depth of the first groove is greater than or equal to the depth of the first groove.

[0015] On the basis of the above technical solution, preferably, a plurality of through holes are opened in the first groove on the outer surface of the needle body, and the through holes are connected with the through hole.

[0016] In a second aspect, the utility model discloses a cylindrical battery, comprising the battery center needle described in the first aspect.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] (1) By arranging multiple first ridges at equal intervals on the outer peripheral surface of the needle body and making the first ridges parallel to the axial direction of the needle body, the electrolyte can quickly penetrate into the interior of the battery along these first grooves. Compared with the traditional spiral grooves, this design reduces the complexity of the penetration path and makes it easier for the electrolyte to reach the center of the battery. Multiple parallel first grooves provide a larger surface area, allowing the electrolyte to more fully contact the central electrode of the battery core, thereby improving the penetration efficiency of the electrolyte, ensuring sufficient infiltration of the central electrode of the battery, reducing the occurrence of lithium precipitation due to less liquid, and greatly improving the cycle life and overall performance of the battery.

[0019] (2) A through hole is provided at the central axis of the needle body. Thus, the temperature at the center of the winding core can be quickly transferred to the electrolyte in the through hole. By avoiding the second ridge in the through hole, the second ridge and the second groove increase the total surface area of ​​the inner surface of the through hole, thereby improving the efficiency of heat transfer and heat dissipation.

[0020] (3) A plurality of through holes are opened in the first groove on the outer surface of the needle body, and the through holes are connected to the through holes. Therefore, the through holes can promote the circulation of electrolyte between the inside and outside of the needle body, so that the electrolyte can circulate more effectively inside the battery, and improve the infiltration effect of the electrolyte in the middle of the winding core. In addition, the presence of the through holes increases the contact area between the electrolyte and the inner wall of the needle body, further enhancing the heat dissipation effect. Through the provision of the through holes, the electrolyte can transfer heat more effectively, which is conducive to accelerating the heat dissipation in the center of the winding core, ensuring the uniformity of the internal temperature of the cylindrical battery, and improving the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the battery center needle disclosed in the utility model;

[0023] Figure 2 It is a schematic diagram of the planar structure of the battery center needle disclosed in the utility model;

[0024] Figure 3 for Figure 2 Plane section view at AA in the middle;

[0025] Reference numerals:

[0026] 1. needle body; 2. first ridge; 21. first groove; 10. through hole; 3. second ridge; 31. second groove; 11. through hole. DETAILED DESCRIPTION

[0027] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] like Figure 1 As shown, combined Figure 2 The utility model discloses a battery center needle, which is used in a cylindrical battery, and includes a needle body 1. The needle body 1 is a columnar structure, and a plurality of first ridges 2 are arranged at equal intervals on the outer peripheral surface of the needle body 1. The first ridges 2 are parallel to the axial direction of the needle body 1, and two adjacent first ridges 2 form a first groove 21 on the surface of the needle body 1.

[0029] With the above technical solution, since the first ridge 2 is parallel to the axial direction of the needle body 1, the electrolyte can quickly penetrate into the interior of the battery along these first grooves 21. Compared with the traditional spiral grooves, this design reduces the complexity of the penetration path and makes it easier for the electrolyte to reach the center of the battery. Multiple parallel first grooves 21 provide a larger surface area, allowing the electrolyte to more fully contact the central pole piece of the battery coil, thereby improving the penetration efficiency of the electrolyte, ensuring full infiltration of the central pole piece of the battery, reducing the occurrence of lithium precipitation from less liquid, and greatly improving the cycle life and overall performance of the battery.

[0030] Preferably, the length of the first ridge 2 is the same as the length of the needle body 1. Since the first ridge 2 runs through the entire length of the needle body 1, the first groove 21 formed also runs through the entire length. This allows the electrolyte to be evenly distributed along the entire length of the needle body 1, and there will be no uneven distribution of the electrolyte due to the lack of a groove in a part.

[0031] In addition, the first ridge 2 extending along the entire length of the needle body 1 can provide additional mechanical support and increase the structural strength and stability of the needle body 1 .

[0032] Preferably, the thickness of the first ridge 2 of this embodiment is 0.2-2mm, the width of the first groove 21 is 0.2mm-1mm, and the depth of the first groove 21 is 0.2mm-1mm. Appropriate thickness of the first ridge 2 and depth and width of the first groove 21 can enhance the structural stability of the needle body 1 while ensuring that the flow and penetration of the electrolyte are not affected by excessive material.

[0033] As an embodiment, the needle body 1 is a solid cylindrical rod-shaped structure, and its main function is to support the outer winding core to prevent the winding core from collapsing and deforming radially inward.

[0034] As another embodiment, a through hole 10 is provided at the central axis of the needle body 1. With this arrangement, the temperature at the center of the winding core can be quickly transferred to the electrolyte in the through hole 10, thereby preventing the temperature at the center of the winding core from being too high and causing thermal runaway.

[0035] By adopting the above technical solution, the second ridge 3 and the second groove 31 are provided to increase the total surface area of ​​the inner surface of the through hole 10, thereby improving the efficiency of heat transfer and heat dissipation. In addition, the mechanical strength of the needle body 1 can be improved by providing the second ridge 3.

[0036] Preferably, the second ridge 3 is equal to the first ridge 2 in length. The equal length design makes the second ridge 3 on the inner circumference of the through hole 10 more uniform, which helps to ensure the consistency of the flow path of the electrolyte, thereby optimizing the flow effect of the electrolyte. The uniform ridge length can ensure the consistency of the performance of the entire needle body 1 in terms of heat conduction and heat dissipation, and avoid local heat conduction differences caused by inconsistent ridge lengths.

[0037] By making the second ridge 3 and the first ridge 2 equal in length, it helps to ensure the structural uniformity and consistency of the thermal conductivity performance of the battery center needle, and it is also possible to simplify the manufacturing process and improve production efficiency and product consistency.

[0038] In this embodiment, the thickness of the second ridge 3 is greater than or equal to the thickness of the first ridge 2, the width of the second groove 31 is greater than or equal to the width of the first groove 21, and the depth of the first groove 21 is greater than or equal to the depth of the first groove 21. Thus, the thickness of the second ridge 3 is increased, so that the surface area of ​​the second ridge 3 is increased, and the contact area with the electrolyte is also enlarged. It helps to improve the efficiency of heat transfer from the inner wall of the center needle through hole 10 to the electrolyte, thereby improving the heat dissipation capacity. The wider and deeper second groove 31 provides a larger surface area, so that the electrolyte can contact the metal center needle over a larger area, thereby improving the heat exchange efficiency.

[0039] Preferably, see Attachment Figure 3 As shown, a plurality of through holes 11 are provided in the first groove 21 on the outer surface of the needle body 1, and the through holes 11 are connected to the through holes 10. With the above technical solution, the provision of the through holes 11 can promote the circulation of the electrolyte between the inside and outside of the needle body 1, so that the electrolyte can circulate more effectively inside the battery, and improve the infiltration effect of the electrolyte in the middle of the winding core, which helps to uniform the ion concentration inside the battery, reduce concentration polarization, and improve battery performance. In addition, the presence of the through holes 11 increases the contact area between the electrolyte and the inner wall of the needle body 1, further enhancing the heat dissipation effect. Through the through holes 11, the electrolyte can transfer heat more effectively, which is conducive to accelerating the heat dissipation in the center of the winding core, ensuring the uniformity of the internal temperature of the cylindrical battery, and improving the service life of the battery.

[0040] Based on the same inventive concept, the utility model also discloses a cylindrical battery, including the battery center needle. By using the battery center needle in the above embodiment, the electrolyte infiltration efficiency inside the cylindrical battery can be improved, while the heat dissipation at the center of the winding core is accelerated to ensure the uniformity of the temperature inside the cylindrical battery and improve the service life of the battery.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery center needle, comprising a needle body (1), characterized in that: The outer peripheral surface of the needle body (1) is provided with a plurality of first ridges (2) at equal intervals, the first ridges (2) are parallel to the axial direction of the needle body (1), and two adjacent first ridges (2) form first grooves (21) on the surface of the needle body (1).

2. The battery center pin according to claim 1, characterized in that: The length of the first convex ridge (2) is the same as the length of the needle body (1).

3. The battery center pin according to claim 2, characterized in that: The thickness of the first ridge (2) is 0.2-2 mm, the width of the first groove (21) is 0.2-1 mm, and the depth of the first groove (21) is 0.2-1 mm.

4. The battery center pin according to claim 1, characterized in that: The needle body (1) is a solid cylindrical rod-shaped structure.

5. The battery center pin according to claim 1, characterized in that: A through hole (10) is provided at the central axis of the needle body (1).

6. The battery center pin according to claim 5, characterized in that: The inner circumferential surface of the through hole (10) is provided with a plurality of second ridges (3) at intervals, the second ridges (3) are parallel to the axial direction of the needle body (1), and two adjacent second ridges (3) form second grooves (31) on the inner surface of the through hole (10).

7. The battery center pin according to claim 6, characterized in that: The second convex ridge (3) and the first convex ridge (2) are of equal length.

8. The battery center pin according to claim 7, characterized in that: The thickness of the second ridge (3) is greater than or equal to the thickness of the first ridge (2), the width of the second groove (31) is greater than or equal to the width of the first groove (21), and the depth of the first groove (21) is greater than or equal to the depth of the first groove (21).

9. The battery center pin according to claim 5, characterized in that: A plurality of through holes (11) are provided in the first groove (21) on the outer surface of the needle body (1), and the through holes (11) are connected to the through hole (10).

10. A cylindrical battery, characterized in that: A battery center needle comprising the battery center needle according to any one of claims 1 to 9.

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