CN-122008616-A - Current collector preheating device, dry electrode film rolling equipment and rolling method

CN122008616ACN 122008616 ACN122008616 ACN 122008616ACN-122008616-A

Abstract

The embodiment of the application provides a current collector preheating device, dry electrode film rolling equipment and a rolling method, wherein the preheating device comprises a cavity, a first probe and a second probe. The cavity is used for heating the current collector. A first probe is disposed in the cavity, the first probe configured to measure a first temperature of the current collector before entering the cavity. The second probe is arranged in the cavity, is opposite to the first probe and is configured to measure a second temperature of the collector body after the collector body leaves the cavity. According to the application, the current collector is preheated through the cavity, the temperature is detected and controlled by the double-temperature probe, so that the interface of the current collector reaches an effective softening window of the adhesive before entering the hot roller, the weak layer and the cracking are avoided by double-sided synchronous compounding, the average value of the peeling strength is improved, the fluctuation between batches and the in-plane dispersion are reduced, and the interface bonding strength of the current collector is obviously improved and stabilized.

Inventors

WANG SHICHUAN
WANG CHEN
LI XIAOLI
LUO XUFANG
YANG HONGPING

Assignees

深圳清研电子科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260205

Claims (10)

1. A collector preheating device for preheating a collector, the collector preheating device comprising: a cavity for heating the current collector; a first probe disposed in the cavity, the first probe configured to measure a first temperature of the current collector before entering the cavity, and The second probe is arranged in the cavity, the second probe is opposite to the first probe, and the second probe is configured to measure a second temperature of the collector body after the collector body leaves the cavity.
2. The header preheating apparatus of claim 1, wherein a third probe is disposed within the cavity, the third probe configured to measure a third temperature of the header within the cavity.
3. The manifold pre-heat device according to claim 1 wherein said cavity comprises a first end and a second end disposed opposite each other, said first end and said second end each having an opening communicating with said cavity, said first probe disposed at said first end, said second probe disposed at said second end, said manifold entering said cavity from said opening of said first end for heating and exiting said cavity from said opening of said second end.
4. A dry electrode film roll-in apparatus for pressing a dry film sheet onto a current collector, characterized in that the dry electrode film roll-in apparatus comprises a preheating device according to any one of claims 1 to 3, the dry electrode film roll-in apparatus further comprising a conveying device configured to convey the current collector to the preheating device, and a pressing device disposed between the conveying device and the pressing device configured to press the dry film sheet onto the preheated current collector to make a dry electrode sheet.
5. The dry electrode film roll pressing apparatus according to claim 4, wherein the pressing device includes a first roll and a second roll disposed opposite to each other, the first roll and the second roll being disposed on both sides of the current collector, respectively, the first roll and the second roll being configured to press the dry film sheet to the current collector.
6. The dry electrode film roll pressing apparatus according to claim 5, wherein the rotation directions of the first roll and the second roll are opposite.
7. The dry electrode film roll pressing apparatus according to claim 5, wherein the first roll and the second roll have a gap therebetween, and the gap has a length of 100 μm to 200 μm.
8. A dry electrode film rolling method, characterized by being applied to the rolling apparatus according to claim 4, comprising: Preheating the current collector to a second temperature; And pressing dry electrode films on the two surfaces of the preheated current collector to obtain dry electrode plates.
9. The dry electrode film roll pressing method according to claim 8, wherein the dry electrode film is pressed to the current collector at a first speed and a first pressure, the second temperature is 58 ℃ to 62 ℃, the first speed is 20 m/min to 50 m/min, and the first pressure is 5T to 7T.
10. The dry electrode film roll pressing method according to claim 8, wherein the dry electrode sheet has a single-sided area density of 8 mg/cm 2 to 25 mg/cm 2 .

Description

Current collector preheating device, dry electrode film rolling equipment and rolling method Technical Field The application relates to the technical field of lithium ion batteries, in particular to a current collector preheating device, a dry electrode film rolling device and a rolling method. Background The dry process of the lithium ion battery electrode fibrillates the binder (such as PTFE) by mechanical shearing to form a fiber network, and the fiber network is matched with powder paving and hot rolling to form a film without solvent, so that the method has the advantages of short flow and low energy consumption. In the related technology, the dry electrode film is compounded with a bare foil or a carbon-coated current collector, so that the interface bonding strength is low and the batch difference is large. Disclosure of Invention In order to solve the above-mentioned shortcomings of the prior art, it is necessary to provide a collector preheating device. In addition, it is also necessary to provide a dry electrode film rolling apparatus including the collector preheating device, and a rolling method using the rolling apparatus. The embodiment of the application provides a collector preheating device which is used for preheating a collector and comprises a cavity, a first probe and a second probe. The cavity is used for heating the current collector. A first probe is disposed in the cavity, the first probe configured to measure a first temperature of the current collector before entering the cavity. The second probe is arranged in the cavity, the second probe is arranged opposite to the first probe, and the second probe is configured to measure a second temperature of the collector body after the collector body leaves the cavity. According to the application, the current collector is preheated through the cavity, the temperature is detected and controlled by the double-temperature probe, so that the interface of the current collector reaches an effective softening window of the adhesive before entering the hot roller, the weak layer and the cracking are avoided by double-sided synchronous compounding, the average value of the peeling strength is improved, the fluctuation between batches and the in-plane dispersion are reduced, and the interface bonding strength of the current collector is obviously improved and stabilized. High-strength bonding can be obtained after the interface is fully activated, excessive collapse of pores and migration fracture of a conductive network are reduced without excessively high pressure or temperature, initial internal resistance and cyclic impedance rise are inhibited, powder dropping and early failure are obviously reduced, and dependence of a production line on high pressure Gao Gunwen is reduced. In some embodiments of the application, a third probe is disposed within the cavity, the third probe configured to measure a third temperature of the current collector within the cavity. In some embodiments of the application, the cavity comprises a first end and a second end which are oppositely arranged, the first end and the second end are respectively provided with an opening communicated with the cavity, a first probe is arranged at the first end, a second probe is arranged at the second end, and the current collector enters the cavity from the opening of the first end to heat and leaves the cavity from the opening of the second end. The embodiment of the application also provides dry electrode film rolling equipment, which is used for pressing the dry electrode film on the current collector, and comprises the preheating device, a conveying device and a pressing device, wherein the conveying device is used for conveying the current collector to the preheating device, the preheating device is arranged between the conveying device and the pressing device, and the pressing device is used for pressing the dry electrode film on the preheated current collector to manufacture a dry electrode plate. In some embodiments of the present application, the lamination device includes a first roller and a second roller disposed opposite to each other, the first roller and the second roller being disposed on two sides of the current collector, respectively, the first roller and the second roller being configured to laminate the dry film sheet to the current collector. In some embodiments of the application, the first and second rollers are rotated in opposite directions. In some embodiments of the application, the first roll and the second roll have a spacing therebetween, the spacing having a length of 100 μm to 200 μm. The embodiment of the application also provides a dry electrode film rolling method which is applied to the rolling equipment and comprises the step of preheating a current collector to a second temperature. And pressing dry electrode films on two surfaces of the preheated current collector to obtain dry electrode plates. In some embodiments of the application, the dr