Electrochemical devices and electronic devices

An electrochemical and battery technology, applied in the field of electrochemical devices and electronic devices, can solve the problems of reducing the energy density of electrochemical devices and affecting the performance of electrochemical devices, and achieve the effects of increasing thickness, weakening shrinkage, and reducing risks

Active Publication Date: 2022-12-02
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the coating process for the production of electrochemical devices, such as figure 1 As shown, the active material layer 11 is set on the metal foil 12, and the area of ​​the active material layer 11 located at the edge of the metal foil 12 will expand outward due to the action of surface energy and gravity, resulting in the formation of a thinned area 13 at the edge of the pole piece. The thickness of the thinned region 13 is smaller than the thickness of the middle region 14, and the width of the thinned region is larger, which will cause the electrochemical device to separate lithium and reduce the energy density of the electrochemical device.
and if figure 2 As shown, due to the shrinkage of the slurry in the coating process, after the slurry is solidified to form a diaphragm, the corner 15 will be formed at the head and tail of the diaphragm. Because the corner 15 is relatively large, it will cause the electrochemical device to analyze. Lithium will also reduce the energy density of electrochemical devices, thereby affecting the performance of electrochemical devices

Method used

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  • Electrochemical devices and electronic devices
  • Electrochemical devices and electronic devices
  • Electrochemical devices and electronic devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The first pole piece preparation process of embodiment 1 is as follows:

[0063] Mix the anode active material graphite, binder styrene-butadiene rubber, and thickener carboxymethyl cellulose in a mass ratio of 96:3:1, add water and stir to obtain a main coating with a solid content of 45% and a viscosity of 4500mPa.s Slurry; mix the anode active material graphite, binder styrene-butadiene rubber, and thickener carboxymethyl cellulose in a mass ratio of 98:1:1, add water and stir to obtain a slurry with a solid content of 48.4% and a viscosity of 7200mPa.s Edge coating slurry.

[0064] Inject the prepared main coating slurry and edge coating slurry into the corresponding feeding system respectively, and adjust the coating machine according to the parameters such as coating weight, coating width and coating length, in which the main coating is intermittently coated Cloth, continuous coating of the edge coating, the main coating slurry and the edge coating slurry are sim...

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Abstract

The electrochemical device disclosed in the present application includes a wound battery cell and a casing for accommodating the battery cell. The battery cell includes a first pole piece, a second pole piece, and a film arranged in layers. The first pole piece includes a current collector, and the current collector It includes a first surface facing the inside of the battery core and a second surface facing away from the inside of the battery core; the tab is electrically connected to the current collector and protrudes from the current collector; the first active material layer is arranged on the first surface of the current collector; An active material layer includes a main coating and an edge coating. Along the first direction, the edge coating is located on the side of the main coating facing the tab, and is adjacent to or partially overlapped with the main coating; along the second direction , the main coating and the edge coating extend in a band shape, and the length of the edge coating is longer than that of the main coating; the electrochemical device has high energy density and good electrical performance.

Description

technical field [0001] The embodiments of the present application relate to the technical field of batteries, and in particular, to an electrochemical device and an electronic device. Background technique [0002] The electrochemical device has a battery cell and a casing for containing the battery cell. The battery cell generally includes a stacked pole piece and a diaphragm. The pole piece has a current collector and an active material layer disposed on the surface of the current collector. In the coating process for the production of electrochemical devices, such as figure 1 As shown, the active material layer 11 is set on the metal foil 12, and the area of ​​the active material layer 11 located at the edge of the metal foil 12 will expand outward due to the action of surface energy and gravity, resulting in the formation of a thinned area 13 at the edge of the pole piece. The thickness of the thinned region 13 is smaller than the thickness of the middle region 14, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M10/0525
CPCH01M4/133H01M10/0525H01M2004/027H01M2004/021Y02E60/10Y02P70/50
Inventor 周卫源戴志芳龙海张青文
Owner NINGDE AMPEREX TECH
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