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Battery pole piece and method for preventing battery pole piece from curling

A technology for battery pole pieces and negative poles, which is applied to battery electrodes, electrode carriers/current collectors, non-aqueous electrolyte battery electrodes, etc., can solve the problems of increasing costs and wasting active materials, and achieve cost savings, increase production efficiency, and prevent tearing Cracked and Broken Effects

Active Publication Date: 2019-12-03
HANGZHOU FUTURE POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has the disadvantage of wasting the active material on the other side and increasing the cost

Method used

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  • Battery pole piece and method for preventing battery pole piece from curling
  • Battery pole piece and method for preventing battery pole piece from curling
  • Battery pole piece and method for preventing battery pole piece from curling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a battery pole piece includes a metal current collector 1, an active material layer 2 is provided on one side of the metal current collector, and a polymer material layer 3 is provided on the other side.

[0033] By arranging a polymer material layer on the side of the metal current collector that does not require an active material layer, it can offset or partially offset the stress caused by the extension of the active material after rolling, so as to solve the problem caused by the single-side coating of the pole piece after rolling. Pole sheet rolling problem. By solving the problem of pole piece curling, the production efficiency of subsequent battery assembly is improved, and the use of polymer material layers saves costs and facilitates automatic production. Sheet tearing and breakage.

[0034] In this embodiment, the metal current collector 1 is a positive electrode current collector or a negative electrode current collector. When th...

Embodiment 2

[0044] This embodiment discloses a method for manufacturing a lithium battery in an aluminum-plastic flexible package, which specifically includes the following steps:

[0045]Step 1) Prepare the positive electrode sheet: the positive electrode active material lithium cobaltate, the binder polyvinylidene fluoride (PVDF) and the conductive agent conductive carbon black are mass ratio (94~98):(1~3):(1 ~3) Mix evenly with the solvent N-methylpyrrolidone, stir at a high speed to obtain a uniformly dispersed positive electrode slurry, and then evenly coat the positive electrode slurry on a 10-14 μm thick positive electrode current collector single-sided aluminum foil, and then blow it After drying, the polyester PET film with a thickness of 45-55 μm is laminated on the aluminum foil on the other side, and then cold-pressed and die-cut to obtain a positive pole piece of the corresponding size. In this embodiment, the thickness of the positive pole piece is 120 μm, the width is 21mm,...

Embodiment 3

[0051] This embodiment discloses a method for manufacturing a lithium battery in an aluminum-plastic flexible package, comprising the following steps:

[0052] Prepare the positive electrode sheet: prepare the positive electrode sheet according to the step 1 of Example 2, the thickness of the positive electrode sheet 4 in this embodiment is 120 μm, the width is 42.2 mm, and the height is 25 mm, such as figure 2 shown;

[0053] Prepare the negative electrode sheet: prepare the negative electrode slurry according to the step 2 of Example 2, then apply the negative electrode slurry on both sides of the 9 μm copper foil, and then cold press and die-cut to obtain a thickness of 148 μm and a width of 22 mm. High is the negative pole piece 5 of 26mm, such as image 3 shown;

[0054] Make electrolyte, make electrolyte the same as step 3) of embodiment 2;

[0055] A piece of positive pole piece 4 prepared is wrapped around a piece of negative pole piece 5, and a separator is set be...

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Abstract

The invention discloses a battery pole piece and a method for preventing the battery pole piece from being curled. The battery pole piece comprises a metal current collector, wherein an active material layer is arranged on side of the metal current collector; and a high polymer material layer is arranged on the other side of the metal current collector. According to the battery pole piece disclosed by the invention, the high polymer material layer is arranged on one side, on which the active material layer does not need to be arranged, of the metal current collector, and stress caused by extension of the active material after rolling can be offset or partially offset, so that the pole piece curling problem caused by single-sided coating and rolling of the pole piece can be solved.

Description

technical field [0001] The invention relates to the battery field, in particular to a battery pole piece and a method for preventing the battery pole piece from curling. Background technique [0002] With the rapid development of electronic equipment technology, our requirements for batteries are also getting higher and higher. The new generation of batteries will inevitably develop towards ultra-thin and flexible, which has been fully reflected in wearable devices and RFID products. Ultra-thin battery, as the name suggests, is a battery with a very thin thickness. Now the thinnest battery can be made of aluminum-plastic flexible packaging lithium battery. [0003] The current aluminum-plastic flexible packaging lithium battery has many obvious advantages such as high energy density, smaller size, ultra-thin, lightweight, high safety and low cost. The biggest feature of ultra-thin batteries is that the thickness of the entire battery is less than 0.5mm, as thin as paper, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/66
CPCH01M4/13H01M4/139H01M4/667Y02E60/10
Inventor 郭也平张承平郑长明郑洪荣浦坚
Owner HANGZHOU FUTURE POWER TECH
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