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Production process and system of high-precision lithium battery pole piece

A production process and production system technology, applied in the production process and system field of high-precision lithium battery pole pieces, can solve the problems of pole piece rebound, inconsistent compaction density, coating process influence, etc.

Active Publication Date: 2021-09-14
四川无量智慧道桥科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a high-precision lithium battery pole piece production process and system to solve the problems of pole piece rebound, inconsistent ductility in each area, and coating Influenced by the process, resulting in many problems such as uneven thickness of the pole piece, inconsistent compaction density, etc., as well as the problem of low edge quality of the pole piece and easy powder drop of the pole piece easily caused by the pole piece cutting process after the rolling process

Method used

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  • Production process and system of high-precision lithium battery pole piece
  • Production process and system of high-precision lithium battery pole piece
  • Production process and system of high-precision lithium battery pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Such as figure 1 The production process of a high-precision lithium battery pole piece shown includes the following steps:

[0054] (A) cutting to form current collectors with desired specifications;

[0055] (B) Put the current collector into the lower mold of the die-casting device, and quantitatively squeeze the slurry onto the current collector;

[0056] (C) The upper mold and the lower mold of the die-casting device are heated to the drying temperature;

[0057] (D) After maintaining the drying temperature for a certain period of time, stop heating the upper mold and the lower mold, and die-cast the current collector during the cooling process to obtain the battery pole piece.

[0058] In one or more embodiments, ultrasonic vibrating is used to quickly and evenly spread the slurry over the current collector.

[0059] In some embodiments, the drying temperature is 140-160°C.

[0060] In some embodiments, the compacted density of the obtained battery electrode sh...

Embodiment 2

[0063] On the basis of Example 1, in the step (B), after the slurry is extruded onto the current collector, the temperature of the lower mold is raised to the first temperature, and the first temperature is 80-95°C; the slurry After being extruded onto the current collector, the lower mold is raised to the first temperature to preheat the slurry, so as to avoid the occurrence of defects caused by excessive drying after the slurry quickly enters the constant-speed drying stage. In the step (D), the upper mold moves downward from the initial position to the pre-compression position, and when the temperature drops to the second temperature, the upper mold moves downward from the pre-compression position to the final die-casting position. The second temperature is 90-125°C.

[0064] During the cooling process, the moisture diffusion rate inside the slurry in the early stage of cooling is lower than the vaporization rate of the surface moisture at the wet bulb temperature. At this ...

Embodiment 3

[0068] Such as Figure 2 to Figure 5 A production system for high-precision lithium battery pole pieces is shown, the system includes a cutting device, a coating device and a die-casting device, wherein:

[0069] The cutting device is used to cut copper foil or aluminum foil into current collectors 1 with required specifications by laser processing;

[0070] The coating device is used to quantitatively squeeze the slurry into the lower mold 3 of the die-casting device, and the slurry 2 is spread above the current collector 1;

[0071] The die-casting device also includes an upper mold 6, the upper mold 6 squeezes the slurry and the current collector 1 in the lower mold 3, and die-casts to obtain battery pole pieces.

[0072] In this embodiment, the cutting device, the coating device and the die-casting device complete the cutting, coating and die-casting processes continuously.

[0073] In one or more embodiments, ultrasonic vibrating is used to quickly and evenly spread the...

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Abstract

The invention relates to a production process and system of a high-precision lithium battery pole piece, and the production process comprises the following steps: cutting to form a current collector with a required specification; putting a current collector into a lower die of a die-casting device, and quantitatively extruding the slurry onto the current collector; heaeting the upper die and the lower die of the die-casting device to the drying temperature; and after the drying temperature is kept for a certain time, enabling the upper mold and the lower mold to stop heating, wherein the current collector is die-cast in the cooling process to obtain the battery pole piece. According to the invention, a rolling process adopted in a traditional production process is replaced by a die-casting process, the current collector does not rebound after external force is removed, the pressure borne by each part of the current collector is consistent, and the situation of inconsistent ductility of each area does not occur, and therefore, the thickness and the compaction density of the battery pole piece manufactured through the die-casting process can be kept highly consistent, and the processing quality, the precision and the yield of the battery pole piece are remarkably improved.

Description

technical field [0001] The invention relates to the field of lithium battery pole piece processing, in particular to a production process and system for a high-precision lithium battery pole piece. Background technique [0002] With the development of lithium-ion battery technology, the application range of lithium-ion batteries is becoming more and more extensive. In addition to portable electronic products, they are also widely used in electric vehicles, large-scale power sources and energy storage fields. Lithium-ion batteries are favored by consumers because of their high specific energy, high voltage, small self-discharge, environmental protection and good safety. [0003] Lithium battery pole pieces are an important part of lithium batteries. Defects in lithium battery pole pieces will seriously affect the quality of lithium batteries, and even cause safety hazards. The manufacture of battery pole pieces belongs to the front-end process of lithium battery technology,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139
CPCH01M4/0404H01M4/0435H01M4/139Y02E60/10
Inventor 钱凤军吴波罗业富
Owner 四川无量智慧道桥科技有限公司
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