Method and device for preparing battery pole piece

A technology for battery pole pieces and preparation devices, which is applied in electrode manufacturing, devices for coating liquid on the surface, special surfaces, etc., and can solve the problems of low micro-short circuit rate of self-discharge performance, poor self-discharge performance of batteries, and high micro-short circuit rate , achieve low micro-short circuit rate, good self-discharge performance, and improve performance

Active Publication Date: 2009-12-30
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of poor self-discharge performance and high micro-short circuit rate of the battery caused by the battery pole pieces prepared in the prior art, and to provide a battery with better self-discharge performance and low micro-short circuit rate. Method for preparing battery pole piece and device for realizing the method

Method used

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  • Method and device for preparing battery pole piece
  • Method and device for preparing battery pole piece

Examples

Experimental program
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Effect test

Embodiment approach

[0029] According to another embodiment, the vibration generating device in the vibration device 3 is externally connected with the vibration box 30, that is, the vibration device 3 includes a motor 31, an eccentric wheel 34 and a vibration input shaft (not shown in the figure). ), preferably, the motor 31 and the eccentric wheel 34 can be integrated and connected to the vibration box 30 through a vibration input shaft. Therefore, the motor 31 is energized to drive the eccentric wheel 34 to vibrate, and the vibration is transmitted to the vibration input shaft through the vibration input shaft. The vibration box 30 transmits the vibration to the coating part 21 through the cover body 32. More preferably, the vibration input shaft can be connected with the cover body 32 of the vibration box 30 to directly transmit the vibration generated by the eccentric wheel 34. The vibration is transmitted to the cover body 32 , and then drives the coating part 21 on the cover body 32 to vibra...

Embodiment 1

[0051] This example is used to illustrate the device and method for preparing battery pole pieces provided by the present invention.

[0052] Apparatus for preparing battery pole pieces such as figure 1 and figure 2 shown. The vibrating device 3 includes five identical vibrating boxes 30 (produced by BYD: model LB-2008A vibrating device) arranged in sequence, wherein the distance between adjacent vibrating boxes 30 is 15 cm. The vibration box 30 includes a cover body 32, which is made of stainless steel and has a size of 100 cm (length)×50 cm (width)×17 cm (height).

[0053] The coating device includes a base wheel 1 and a coating wheel (not shown in the figure). The radius of the base wheel 1 is 100-200 mm, and the axial width is 400-600 mm. The shortest horizontal distance between the axial edge of the base wheel 1 and the outer edge of the vibration device 3 is 30 centimeters, and the center line of the vibration box 30 on the width passes through the midpoint of the b...

Embodiment 2

[0062] This example is used to illustrate the device and method for preparing battery pole pieces provided by the present invention.

[0063] According to the device and method described in Example 1 to prepare battery pole pieces, the difference is,

[0064] The number of the vibrating boxes 30 is three.

[0065] The above-mentioned electrode slurry was applied to one surface of the aluminum foil as the current collector 2 by a coating wheel at a linear speed of 2000 mm / min. The conveying speed of the current collector 2 is 2000 mm / min, and the coating part 21 also passes through the vibrating device 3 at a speed of 2000 mm / min, that is, the total time for the vibration of the coating part 21 is 1.5 minutes , the time interval between two adjacent vibrations is 0.075 minutes. Also, the frequencies of the vibrations to which the application portion 21 was subjected were 800 Hz, 700 Hz, and 600 Hz in order, and the amplitudes were 0.3 mm, 0.25 mm, and 0.20 mm in order.

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Abstract

The invention provides a method for preparing a battery pole piece. The method comprises the following steps: coating pole slurry on a current collecting body; and vibrating the obtained current collecting body coated with the pole slurry on the surface. The invention provides a device for preparing the battery pole piece. The device comprises a coating device and a vibrating device, wherein the pole slurry is coated on the surface of the current collecting body by the coating device, and the vibrating device is used for vibrating the current collecting body coated with the pole slurry on the surface. After being placed in a room with the temperature of 20+/-2 DEG C and the humidity of 20 percent-50 percent for 28 days in an open circuit, a battery with the volume of 4.2 V, which is prepared by the battery pole piece prepared by the device and the method, reduces the voltage by 5 mV at most, and the micro-short circuit rate tested by 20,000 batteries is 0.01 percent; and the battery prepared by a device and a method in the prior art has the voltage reduction up to 50 mV and the micro-short circuit rate of 0.05 percent under the completely same condition.

Description

technical field [0001] The invention relates to a method for preparing battery pole pieces and a device for realizing the method. Background technique [0002] In the existing production of battery pole pieces, the commonly used devices include a coating device and a drying device for coating the electrode slurry on the surface of the current collector. Therefore, the method of using this device to prepare battery pole pieces is usually to first roll the electrode slurry on the current collector through a coating device attached to the electrode slurry, such as a coating wheel attached to the electrode slurry, or manually apply the electrode slurry coated on the current collector, wherein the electrode slurry is a slurry containing active material and binder. After the coating, the obtained current collector whose surface is coated with the electrode slurry is then dried by a drying device. Although this production method has a simple process, the battery pole piece prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04B05D5/12B05D3/12
CPCY02E60/12Y02E60/10
Inventor 赵文杰黄华英何劲柏
Owner SHANGHAI BYD
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