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Lithium battery pole piece mold forming die-casting system and die-casting process

A mold forming and lithium battery technology, applied in electrode forming, battery electrodes, electrode manufacturing, etc., can solve the problems of pole piece rebound and inconsistent ductility, so as to prevent rebound, improve die-casting effect and quality, and prevent pole piece rebound Effect

Active Publication Date: 2021-10-19
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

[0005] The purpose of the present invention is to provide a die-casting system and die-casting process for lithium battery pole pieces, so as to solve the problems of pole piece rebound and inconsistent ductility in each area caused by the roll pressing process in the production process of lithium battery pole pieces in the prior art

Method used

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  • Lithium battery pole piece mold forming die-casting system and die-casting process
  • Lithium battery pole piece mold forming die-casting system and die-casting process
  • Lithium battery pole piece mold forming die-casting system and die-casting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Such as Figure 1 to Figure 8 A die-casting system for forming a lithium battery pole piece is shown, including a conveyor belt 1 and a driving wheel 2 for driving the conveyor belt 1 to move. Several die-casting devices 3 are fixedly installed on the conveyor belt 1. The die-casting devices 3 include mutual Matching lower mold 33 and upper mold 34, the lower mold 33 is used to load the current collector 42 and the slurry 43 laid on the upper surface of the current collector 42, and the upper mold 34 is used to extrude the slurry located in the lower mold 33 The slurry 43 and the current collector 42;

[0066] During the movement of the die-casting device 3 along the conveyor belt 1, at least one die-casting cycle is completed. In the die-casting cycle, the lower mold 33 and the upper mold 34 start to cool down after being heated to the drying temperature. During the cooling process, the The upper mold 34 continues to apply pressure to the slurry 43 and the current col...

Embodiment 2

[0074] On the basis of Example 1, the die-casting cycle includes a charging state, a drying state, a die-casting state and a reclaiming state in sequence, wherein:

[0075] In the charging state, the lower mold 33 is filled with a current collector 42, and the slurry 43 is poured on the current collector 42;

[0076] In the drying state, the upper mold 34 and the lower mold 33 are heated to the drying temperature;

[0077] In the die-casting state, the temperature of the upper mold 34 and the lower mold 33 continues to decrease, and the upper mold 34 squeezes the current collector 42 and the slurry 43 in the lower mold 33;

[0078] In the reclaiming state, the pressure applied by the upper mold 34 on the lithium battery pole piece is removed, and the lithium battery pole piece is taken out from the lower mold 33;

[0079] The temperature of the upper mold 34 and the lower mold 33 in the die-casting state is lower than the temperature of the upper mold 34 and the lower mold 33...

Embodiment 3

[0083] On the basis of the above-mentioned embodiments, the die-casting state includes a final state and at least one pre-pressed state. In the final state, the upper mold 34 applies a final pressure to the current collector 42 and the slurry 43. In the pre-pressed state Next, the upper mold 34 applies an intermediate pressure to the current collector 42 and the slurry 43, and the pressure value of the intermediate pressure is smaller than the pressure value of the final pressure; when reaching the pre-pressed state or the final state, the upper mold 34 remains Current stress for a while.

[0084] This embodiment is not only conducive to the uniform spreading of the slurry, but also beneficial to the drying of the slurry during the drying process at reduced speed, and can further prevent the rebound of the pole piece, and finally achieve the required compaction density.

[0085] In one or more embodiments, the obtained battery electrode sheet for the positive electrode has a c...

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Abstract

Provided are a lithium battery pole piece mold forming die-casting system and die-casting process. The system comprises a conveying belt and a driving wheel. A plurality of die-casting devices are fixedly installed on the conveying belt, each die-casting device comprises a lower die and an upper die which are matched with each other, the lower dies are used for containing current collectors and slurry, and the upper dies are used for extruding the slurry and the current collectors located in the lower dies. in the process in which the die-casting devices move along the conveying belt, at least one die-casting cycle is completed. In the die-casting cycle, the lower dies and the upper dies start to be cooled after being heated to the drying temperature. In the cooling process, the upper dies continuously apply pressure to the slurry and the current collectors till a lithium battery pole piece is formed. In the process in which the die-casting devices move on the conveying belt, at least one die-casting cycle is independently completed. In one die-casting cycle, the upper dies do not continuously apply pressure to materials in the lower dies, so that the current collectors are effectively prevented from rebounding in the pressing process, and the die-casting effect and quality of the die-casting procedure are remarkably improved.

Description

technical field [0001] The invention relates to the field of lithium battery pole piece processing, in particular to a lithium battery pole piece mold forming die-casting system and a die-casting process. 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 tech...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/04H01M4/62
CPCH01M4/139H01M4/0433H01M4/622Y02E60/10
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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