Connecting structure of battery tab and pole piece

Abstract

The utility model discloses a connecting structure of a battery tab and a pole piece in the field of lithium batteries, which comprises a pole piece body and a tab body, the pole piece body consists of a base material and a slurry layer coated on the surface of the base material, and the tab body is welded on the side surface of the base material of the pole piece body. The tab body is directly welded on the side face of the base material of the pole piece body, the surface of the base material is not occupied, the area of a slurry layer of the pole piece body can be increased after slurry coating, the capacity of the lithium battery can be improved, the procedure of coating the slurry on the surface of the base material can be optimized, continuous processing can be performed during slurry coating, pausing is not needed during coating, and the processing efficiency is higher; the thickness consistency of the pole piece body is ensured, and the quality of the pole piece body is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a connection structure between a battery pole ear and a pole piece. Background Art

[0002] Lithium batteries are an important type of battery with a wide range of applications and significant performance characteristics. Among them, the connection between the internal pole piece and the pole ear is an important link in the battery manufacturing process. The connection structure between the pole piece and the pole ear can directly affect the performance of the lithium battery and ensure the normal operation and excellence of the lithium battery.

[0003] However, the current structure of connecting the pole piece and the pole ear in lithium batteries, such as Figure 1 As shown, when the slurry is coated on the substrate of the pole piece 1, a blank space for welding the pole ear 2 will be left intentionally. Due to the limitation of the blank space, the coating machine needs to slow down when coating the slurry 3, and then continue to accelerate the coating after leaving the blank space. The coating efficiency is low, and the deceleration and acceleration process will affect the quality of product production. After the pole ear 2 is ultrasonically welded on the surface of the pole piece, the pole ear 2 not only occupies the area of ​​the pole piece 1 surface coated with the slurry 3, but also occupies the thickness of the lithium battery. Not only is the capacity of the lithium battery not improved, but it also affects the flatness of the surface of the lithium battery. Utility Model Content

[0004] In order to overcome the deficiencies of the existing technical solutions, the utility model provides a connection structure between a battery pole ear and a pole piece, which can effectively solve the technical problem that the current connection structure between the pole piece and the pole ear affects the performance of the lithium battery.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A connection structure between a battery pole tab and a pole piece comprises a pole piece body and a pole tab body, wherein the pole piece body is composed of a substrate and a slurry layer coated on the surface of the substrate, and the pole tab body is welded to the substrate side of the pole piece body.

[0007] Furthermore, the substrate is made of metal foil.

[0008] Furthermore, the pole ear body extends outward away from one end of the pole piece body.

[0009] Furthermore, the connection between the pole piece body and the pole ear body is provided with an exposure position distributed on both the front and back sides for directly exposing the substrate.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The utility model directly welds the pole ear body to the side of the substrate of the pole piece body, does not occupy the surface of the substrate, and can increase the area of ​​the pole piece body slurry layer after coating the slurry, which can not only improve the capacity of the lithium battery, but also optimize the process of coating the slurry on the surface of the substrate. The slurry coating can be processed continuously without pausing during the process, and the processing efficiency is higher, which ensures the consistency of the thickness of the pole piece body and improves the quality of the pole piece body. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the connection structure between the pole piece and the pole ear in the background technology of the utility model;

[0013] Figure 2 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0014] Figure 3 For the utility model embodiment Figure 2 A schematic diagram of the structure enlargement of part A;

[0015] Figure 4 This is a schematic diagram of the structure of the pole piece of the embodiment of the utility model;

[0016] Numbers in the figure:

[0017] Figure 1 Middle: 1-pole piece, 2-ear, 3-slurry;

[0018] Figure 2-4 Middle: 4-pole sheet, 5-ear body; 401-substrate, 402-slurry layer, 403-exposed position. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 2-4 As shown, the utility model provides a connection structure between a battery tab and a pole piece, which is mainly used for pole pieces and tabs inside lithium batteries. The pole pieces and tabs are connected through a specific structure, which can achieve the effect of optimizing the performance of lithium batteries.

[0021] The structure of the pole piece body 4 is mainly composed of a substrate 401 and a slurry layer 402 coated on both sides. Specifically, the inner substrate 401 is mainly composed of metal foil, which is a very thin metal sheet with good electrical conductivity. At the same time, the metal foil also has a certain anti-oxidation property, which can prevent the electrical conductivity from being weakened.

[0022] The slurry layer 402 coated on the surface of the substrate 401 is coated on the front and back of the substrate 401. This coating method can expand the area of ​​the slurry layer 402, effectively increasing the capacity of the lithium battery and storing more electricity. The slurry on the slurry layer 402 is made of positive electrode powder or negative electrode powder according to different locations. After coating, it needs to be rolled and dried to form the slurry layer 402.

[0023] When the pole ear body 5 is welded to the pole piece body 4, one end of the pole ear body 5 is directly welded to the side of the substrate 401 of the pole piece body 4, and does not contact the slurry layer 402 on the front and back sides. This welding method does not occupy the thickness of the battery and can also increase the capacity of the lithium battery. Moreover, in the coating operation, there is no need to deliberately leave space on the surface of the substrate 401, which optimizes the entire coating process. When coating the slurry, the coating machine can complete the coating on the surface of the substrate 401 without stopping at one time, and no deceleration or pause operation is required during the period, which improves the efficiency of coating and ensures the consistency of the thickness of the pole piece body 4.

[0024] In addition, it should be noted that the thickness of the pole ear body 5 is 0.1 mm, while the thickness of the substrate 401 in the pole piece body 4 is 0.07 mm. Since the thickness of the pole ear body 5 is greater than the thickness of the substrate 401, in order to better allow the pole ear body 5 to be welded to the side of the pole piece body 4, an exposed position 403 is provided on the front and back sides of the pole piece body 4 to directly expose the substrate 401 for convenient welding of the pole ear body 5. The exposed position 403 only needs a width of 1 mm to 2 mm, and is formed by processing after the continuous coating of the slurry is completed. If there is no exposed position 403, the welding of the pole ear body 5 and its stability after welding will be affected.

[0025] Compared with the traditional technology, the present technical solution directly welds the pole ear body 5 to the side of the substrate 401 of the pole piece body 4 without occupying the surface of the substrate 401. After coating the slurry, the area of ​​the slurry layer 402 of the pole piece body 4 can be increased, which can not only improve the capacity of the lithium battery, but also optimize the process of coating the slurry on the surface of the substrate 401. The slurry coating can be continuously processed without pausing during the period, and the processing efficiency is higher, which ensures the consistency of the thickness of the pole piece body 4 and improves the quality of the pole piece body 4.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A connection structure between a battery tab and a pole piece, comprising a pole piece body and a tab body, characterized in that: The pole piece body is composed of a substrate and a slurry layer coated on the surface of the substrate. The pole ear body is welded to the side of the substrate of the pole piece body. The substrate is composed of metal foil. The pole ear body extends outward away from one end of the pole piece body. The connection between the pole piece body and the pole ear body is provided with exposure positions distributed on the front and back sides to directly expose the substrate.

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