Square coiled battery pole piece as well as preparation method and square soft package battery thereof

A battery pole piece, winding technology, applied in electrode manufacturing, battery electrode, electrode current collector coating, etc., can solve the problems of reducing battery polarization, increasing battery polarization, etc., to reduce polarization effect, small polarization effect, improved consistency

Inactive Publication Date: 2018-11-02
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to, aiming at the above-mentioned defects, provide a square winding battery pole piece and its preparation method and a square pouch battery, so as to solve the problems caused by the continuous coating of slurry on the current collector in the prior art. The problem of increasing the polarization of the battery can achieve the effect of reducing the polarization of the battery

Method used

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  • Square coiled battery pole piece as well as preparation method and square soft package battery thereof
  • Square coiled battery pole piece as well as preparation method and square soft package battery thereof
  • Square coiled battery pole piece as well as preparation method and square soft package battery thereof

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preparation example Construction

[0026] According to an embodiment of the present invention, a method for preparing a square wound battery pole piece is provided. The preparation method of the square wound battery pole piece may include: a coating step and a rolling and punching step. in:

[0027] Coating step: the battery slurry is intermittently coated on both sides of the current collector to form two or more slurry coating areas that are sequentially spaced along the length direction of the current collector (for example: the first slurry coating Zone 12), and there is a blank area (for example: blank zone 13) where the battery slurry is not coated at the end of each segment of the slurry coating zone.

[0028] For example: when the positive and negative electrode slurry of lithium ion battery is coated on the current collector, the intermittent coating method is adopted, that is, after each period of slurry is coated, a certain length of empty foil is left uncoated.

[0029] Wherein, the coating surfac...

Embodiment

[0086] In one embodiment of the present invention, a kind of preparation method of square winding type pole piece for lithium ion battery is provided, the preparation method of square winding type pole piece for lithium ion battery may comprise the following steps:

[0087] Step 11. Take the positive electrode slurry to be coated and apply extrusion coating with a double-sided density of 150g / m 2 , the width of the aluminum foil is 130 mm, the thickness is 15 μm, and the coating width is 110 mm. One side in the lateral direction of the coating is reserved as a tab area without coating, and the width of the tab in the tab area is 20 mm.

[0088] Among them, at the beginning of coating (for example: using a coating machine for coating), the first section is left blank for 3mm after coating 80mm; the second section is left blank for 4mm after coating 82mm, and each additional section of , the coating length is increased by 2mm compared with the coating length of the previous sect...

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Abstract

The invention discloses a square coiled battery pole piece as well as a preparation method and a square soft package battery thereof. The preparation method comprises the following steps: coating, namely carrying out double-faced intermittent coating on a current collector by adopting battery slurry, so as to form more than two of slurry coating areas which are sequentially distributed at intervals in the length direction of the current collector, and reserving a blank area uncoated with the battery slurry at the tail part of each slurry coating area, wherein coating areal density of any slurry coating area is 90-160g/m<2>; and rolling and punching, namely after the double-faced intermittent coating is completed, carrying out rolling and punching treatment on the current collector coated with more than two slurry coating areas, thus the required square coiled battery pole piece is obtained. The scheme of the invention can overcome the defects of large polarization effect, poor batteryperformance and poor use security and realizes the beneficial effects of small polarization effect, good battery performance and good use security.

Description

technical field [0001] The invention belongs to the technical field of batteries (for example: lithium ion batteries), in particular to a square wound battery pole piece and a preparation method thereof and a square pouch battery, in particular to a square wound pole piece and a lithium ion battery. Its preparation method, and the square pouch battery with the square winding battery pole piece. Background technique [0002] In recent years, due to the depletion of traditional energy sources and the continuous emergence of environmental pollution problems, lithium-ion batteries have been widely used in electric vehicles, which puts stricter requirements on the consistency of lithium-ion batteries. The traditional preparation method of the square wound battery pole piece adopts the method of continuous coating, and the slurry is coated on the current collector. When such a pole piece is wound, it is easy to form a larger polarization interval at the corners on both sides as t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04H01M4/13H01M10/0525H01M10/0587
CPCH01M4/0404H01M4/0435H01M4/13H01M4/139H01M10/0525H01M10/0587H01M2220/20Y02E60/10Y02P70/50
Inventor 何海平詹世英马美品
Owner YINLONG ENERGY CO LTD
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