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 af

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

Examples

Experimental program
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Effect test

Example Embodiment

[0044] Example 1

[0045] like Figures 1 to 7 As shown, this embodiment 1 provides a manufacturing process of a positive electrode sheet for a multi-pole ear cell, which specifically includes the following steps:

[0046] S1, coating the active slurry: the positive active slurry is evenly coated on the surface of the pole piece by zebra coating and rolled to make the first positive pole piece 1 with the blank area on the upper and lower sides and the dressing area in the middle;

[0047] S2, pole piece cutting: the first positive pole piece 1 is cut along its transverse midline, and two second positive pole pieces 2 are obtained by cutting;

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

[0049] S4, electrode cleaning: clean the dressing area of ​​the first electrode lug 3, remo...

Example Embodiment

[0060] Example 2

[0061] like Figures 8 to 14 As shown, this embodiment 2 provides a manufacturing process of a negative electrode sheet for a multi-pole ear cell, which specifically includes the following steps:

[0062] S1, coating the active slurry: the negative electrode active slurry is evenly coated on the surface of the pole piece by zebra coating and rolled to make the first negative pole piece 7 with a blank area on the upper and lower sides and a dressing area in the middle;

[0063] S2, pole piece cutting: the first negative pole piece 7 is cut along its transverse midline, and two second negative pole pieces 8 are obtained by cutting;

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

[0065] S4. Cleaning of the tabs: Clean the dressing area of ​​the second tab 9,...

Example Embodiment

[0070] Example 3

[0071] This embodiment 3 provides a multi-pole battery cell, which is composed of the positive electrode sheet for the multi-pole ear battery cell, the negative electrode sheet for the multi-pole ear battery cell, and the separator in the above-mentioned Embodiments 1 and 2, which are wound and / or It is obtained after lamination, in which a plurality of positive electrode tabs are arranged one by one, and a plurality of negative electrode tabs are arranged one by one. Compared with the production process of conventional multi-pole tab batteries, when the positive and negative electrode sheets are coated, the dressing area does not need to be guaranteed. Single-sided and double-sided alignment reduces the process capability requirements 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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