Structure for reducing rubbing dust capacity of cylindrical full-tab battery

Abstract

The utility model discloses a structure for reducing the rubbing dust capacity of a cylindrical full-tab battery, which comprises a battery cell, a central hole is arranged in the middle of the battery cell, a needle-shaped metal piece is arranged in the central hole, a tab is cut into a plurality of fan-shaped subareas on the end surface of the battery cell by using laser, tab grooves are formed among the fan-shaped subareas, and the tabs are arranged in the tab grooves. The fan-shaped subareas are pre-pressed from the outer side to the inner side; when the full-tab battery is kneaded, a mechanical forced compression method or an angled pre-lodging method is adopted, and the dust amount generated in the kneading process of the cylindrical full-tab battery can be effectively reduced, so that the safety of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cylindrical batteries, in particular to a structure for reducing the amount of dust produced by flattening a cylindrical full-electrode battery. Background Art

[0002] The current full-ear cylindrical battery has the advantages of small internal resistance and good thermal safety, and has a very good development prospect technology. However, the flattening process is a key process in the production of full-ear cylindrical batteries. The metal debris generated during the flattening process affects the safety of the battery. Therefore, it is necessary to improve the structure and method in order to reduce the amount of dust generated by the flattening process.

[0003] Among the existing methods for improving the flattening effect, patent CN220086083U makes the end face of the cylindrical battery after winding and flattening have a blank area to reduce metal debris during flattening, but this method has many die-cutting times, and multiple die-cutting will cause oxidation at the cut of the current collector, affecting the electrochemical performance of the battery cell; patent CN116154317A controls the flattening wheel to flatten the preset flattening area of ​​the end face of the pole ear, but there is an unflattened area in the middle. Therefore, this application improves the structure of the end face of the pole ear and improves the flattening method to further reduce the amount of dust from flattening of the full-pole ear battery. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a structure for reducing the amount of dust produced by flattening a cylindrical full-tab battery.

[0005] The purpose of the utility model is achieved through the following technical solutions: a structure for reducing the amount of dust flattened by a cylindrical full-tab battery, comprising a battery cell, a center hole being provided in the middle of the battery cell, a needle-shaped metal piece being installed in the center hole, the needle-shaped metal piece being arranged as required, and the center hole being filled and protected by inserting the needle-shaped metal piece into the center hole, the end face of the battery cell being cut into a plurality of sector-shaped partitions by laser, a tab groove being formed between the sector-shaped partitions, and the sector-shaped partitions being pre-pressed from the outside to the inside.

[0006] A further technical solution is to use mechanical forced compression when flattening the full-tab battery.

[0007] A further technical solution is to use an angled pre-lodging method when flattening the full-tab battery.

[0008] The utility model has the following advantages:

[0009] (1) The utility model inserts a needle-shaped metal piece into the center hole for filling and protection, thereby preventing the tab from being rubbed into the center hole and causing damage during flattening; pre-pressing is performed by laser cutting and zoning, so that the tab is made to fall in one direction and then flattened during flattening, thereby reducing metal debris.

[0010] (2) The utility model can further reduce the generation of dust during the leveling stage by mechanical forced compression or angled pre-lodging and leveling methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the end surface structure of the utility model;

[0012] Figure 2 It is a forced flattening top view of the utility model;

[0013] Figure 3 The pre-lodging and leveling structure diagram of the utility model.

[0014] In the figure, 1. center hole; 2. needle-shaped metal part; 3. pole ear groove. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0017] A reference group was set up: using conventional structure and flattening process, the number of dust in the cylindrical full-tab battery was 15pcs, the hole blocking was 5‰, and the laser welding penetration was 1%.

[0018] Embodiment 1:

[0019] like Figure 1 As shown, the battery cell is fixed with a clamp and the center hole 1 is blocked with a needle-shaped metal part 2 such as a metal rod, and the pole ear is cut with a laser to form 4 partitions. A pole ear groove 3 is formed at the connection of the partitions. Then, the fan-shaped metal sheet is pre-pressed from the outside to the inside and then flattened. The number of dust in the cylindrical full-pole ear battery is 8pcs, the hole is blocked by 1‰, and the laser welding penetrates 5‰.

[0020] Embodiment 2:

[0021] Fix the battery cell with a clamp and block the center hole 1 with a metal rod. Use a saw blade to cut the pole ear to form 5 partitions. Then use a metal rod to roll it and flatten it. The number of dust is 10pcs, the hole is blocked 1‰, and the laser welding penetrates 5‰.

[0022] Embodiment 3:

[0023] Fix the battery cell with a clamp and block the center hole 1 with a metal rod. Use a saw blade to cut the pole ear to form 8 partitions. Then use a fan-shaped metal sheet to pre-press from the outside to the inside, and then use a mold to directly flatten the pole ear. The number of dust is 12pcs, the hole is blocked 1‰, and the laser welding penetrates 5‰.

[0024] Embodiment 4:

[0025] like Figure 2 As shown, the full-tab battery is flattened by mechanical forced compression, with 3 pcs of dust, 4‰ of blocked holes, and 5‰ of laser welding penetration.

[0026] Embodiment 5:

[0027] like Figure 3 As shown, the pre-lodging method is used to flatten the full-ear battery, the pre-lodging angle θ=30°, the number of dust is 7pcs, the hole blocking is 4‰, and the laser welding penetration is 6‰.

[0028] Embodiment 6:

[0029] When flattening the full-ear battery, the pre-prostrating method is adopted. The pre-prostrating angle θ=45°, the number of dust is 7pcs, the hole blocking is 3‰, and the laser welding penetration is 6‰.

[0030] Embodiment 7:

[0031] When flattening the full-ear battery, the pre-lodging method is adopted. The pre-lodging angle θ=60°, the number of dust is 7pcs, the hole blocking is 2‰, and the laser welding penetration is 6‰.

[0032] From the comparison between Examples 1-3 and the reference group, it can be seen that using a needle-shaped metal piece to insert into the center hole for filling and protection can prevent the pole ear from being rubbed into the center hole and causing damage during flattening; using a laser to cut the pole ear of the winding core into n equal parts so that the symmetry axis of the dividing area can be pre-stressed; pre-stressing the fan-shaped metal sheet so that the pole ear falls in one direction and then flattens during flattening can reduce metal debris.

[0033] From the comparison between Example 4 and the reference group, it can be seen that the use of mechanical forced compression can reduce the generation of dust during the flattening stage of the cylindrical full-tab battery.

[0034] From the comparison between Examples 5-7 and the reference group, it can be seen that the angled pre-lodging can reduce the risk of blockage of the center hole. Assuming that the flattening length is L and the flattening angle is θ, the maximum distance from the flattened electrode to the center hole changes from L to L*COSθ; the use of a mechanical angled pre-lodging method can reduce the generation of dust during the flattening stage of cylindrical full-electrode batteries.

[0035] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. 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 structure for reducing the amount of dust produced by flattening a cylindrical full-tab battery, comprising a battery cell, characterized in that: A central hole (1) is provided in the middle of the battery core, a needle-shaped metal part (2) is installed in the central hole (1), a pole ear is cut into a plurality of sector-shaped partitions at the end face of the battery core by laser, pole ear grooves (3) are formed between the sector-shaped partitions, and the sector-shaped partitions are pre-pressed from the outside to the inside.

2. The structure for reducing the amount of dust generated by flattening cylindrical full-tab batteries according to claim 1, characterized in that: The full-tab battery is flattened by mechanical forced compression.

3. The structure for reducing dust amount of cylindrical full-tab battery flattened according to claim 1, characterized in that: When rolling the full-tab battery, an angled pre-lodging method is used.

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