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Preparation method of multi-tab battery cell, multi-tab battery cell and multi-tab battery thereof

A multi-pole ear and cell technology, which is used in non-aqueous electrolyte batteries, electrolyte battery manufacturing, electrode manufacturing, etc. The overall energy density and area of ​​the battery are difficult to control, which can save production cycles, improve overall energy density, and reduce process capability requirements.

Pending Publication Date: 2021-12-28
惠州锂威新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at present, there are great limitations in the manufacturing process of the multi-tab structure cell, which is mainly manifested in the low design level of the cell Overhang (referring to the length and width of the negative pole piece beyond the positive and negative pole pieces). When designing the Overhang, it will be affected by multiple processes, which makes it difficult to control the area of ​​the Overhang, resulting in a decrease in the surface density accuracy of the pole piece coating, the dimension accuracy of the pole piece, and the assembly accuracy of the battery cell, and ultimately reduces the overall energy of the multi-tab battery. density

Method used

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  • Preparation method of multi-tab battery cell, multi-tab battery cell and multi-tab battery thereof
  • Preparation method of multi-tab battery cell, multi-tab battery cell and multi-tab battery thereof
  • Preparation method of multi-tab battery cell, multi-tab battery cell and multi-tab battery thereof

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Embodiment 1

[0045] like Figure 1-7 As shown, what this embodiment 1 provides is the manufacturing process of the positive electrode sheet for the multi-tab battery, which specifically includes the following steps:

[0046] S1. Coating the active slurry: apply the positive electrode active slurry evenly on the surface of the electrode sheet by zebra coating and roll it to make the first positive electrode sheet 1 with blank areas on the upper and lower sides and a dressing area in the middle;

[0047] S2. Pole sheet cutting: the first positive electrode sheet 1 is cut along its transverse midline to obtain two second positive electrode sheets 2;

[0048]S3. Tab die-cutting: the edge of the second positive electrode sheet 2 is cut along the first die-cutting line 4 to form a plurality of first tabs 3, wherein the length of the first die-cutting line cut into the dressing area is 2 mm;

[0049] S4. Tab cleaning: Clean the dressing area of ​​the first tab 3, wash off the auxiliary materials...

Embodiment 2

[0061] like Figure 8-14 As shown, what this embodiment 2 provides is the manufacturing process of the negative electrode sheet for the multi-tab battery, which specifically includes the following steps:

[0062] S1. Coating the active slurry: apply the negative electrode active slurry evenly on the surface of the electrode sheet by zebra coating and roll it to make the first negative electrode sheet 7 with blank areas on the upper and lower sides and a dressing area in the middle;

[0063] S2. Pole sheet cutting: the first negative electrode sheet 7 is cut along its transverse midline to obtain two second negative electrode sheets 8;

[0064] S3. Tab die-cutting: the edge of the second negative electrode sheet 8 is cut along the second die-cutting line 10 to form a plurality of second tabs 9, wherein the length of the second die-cutting line cut into the dressing area is 2 mm;

[0065] S4, tab cleaning: clean the dressing area of ​​the second tab 9, wash off the auxiliary ma...

Embodiment 3

[0071] The multi-tab cell provided in this embodiment 3 is formed by winding and / or After lamination, the multiple positive tabs are aligned one by one, and the multiple negative tabs are aligned one by one. Compared with the production process of the conventional multi-tab battery, the dressing area does not need to be guaranteed when the positive and negative electrodes are coated. The single-sided and double-sided alignment reduces the requirements for the process capability of the previous process.

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Abstract

The invention belongs to the technical field of lithium batteries, and particularly discloses a preparation method of a multi-tab battery cell, the multi-tab battery cell and a multi-tab battery thereof. The preparation method comprises the following steps of S1, coating active slurry: evenly coating the surface of a pole piece with the active slurry in a zebra coating mode and rolled, and preparing a first pole piece; S2, slitting the pole piece: slitting the first pole piece to obtain a second pole piece; s3, performing die cutting on tabs: cutting the edge of the second pole piece to form a plurality of first tabs; s4, tab cleaning: cleaning the dressing area of the first tab; S5, tab dispensing: performing dispensing treatment on the first tab; and S6, winding and / or laminating the second pole piece and the diaphragm to obtain the multi-tab battery cell. During coating, the requirement for alignment of single-face and double-face coating is lowered, so that the requirement for the processing capacity of the previous procedure is lowered, the total slitting frequency is reduced by half compared with that of a traditional mode, the accumulated tolerance of the length size of the pole piece is reduced, the die cutting and winding precision is improved, and the overall energy density of a battery cell is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a preparation method of a multi-tab battery cell, a multi-tab battery cell and a multi-tab battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, light weight, and good safety performance, so they have a monopoly in the application of mobile electronic devices such as Bluetooth headsets, mobile phones, notebook computers, tablet computers, cameras, and portable mobile power supplies. At the same time, with the advancement of science and technology, the market scale of electric motorcycles and electric vehicles continues to expand, and the requirements for charging speed and energy density of lithium-ion batteries are also getting higher and higher. It is necessary to balance the current of the battery by adjusting the structure of the battery tabs Distribution, in order to increase the charging speed of the b...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M50/536H01M50/538H01M10/0525H01M10/058H01M50/533
CPCH01M4/043H01M50/536H01M50/533H01M50/538H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 郑开元韩冰纪荣进郑明清陈杰李载波
Owner 惠州锂威新能源科技有限公司
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