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High-voltage lithium ion battery, battery pole piece and infiltration method thereof

A lithium-ion battery, high-voltage technology, which is applied in non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, and electrolyte battery manufacturing, etc. Longer and other problems, to solve the general infiltration difficulties, improve high internal resistance and short life, increase the effect of vibration shelving operation

Active Publication Date: 2021-07-13
HUIZHOU HENGTAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, with the improvement of battery material compaction, the use of the original electrolyte has problems such as difficulty in absorbing liquid for the pole piece, increased liquid injection time, and poor consistency of liquid absorption for the pole piece.
These problems will lead to longer battery production cycle, lower production efficiency, poor battery consistency, deterioration of electrical performance, and even negative electrode lithium precipitation, causing safety problems
That is to say, the existing technology has the problems of difficulty in absorbing liquid and poor consistency of liquid absorption under high compaction conditions.

Method used

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  • High-voltage lithium ion battery, battery pole piece and infiltration method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Place the battery cell that has just been injected with electrolyte but has not been sealed once in the vacuum box. The vacuum box is divided into three stages of vacuuming process. After the vacuuming is completed, the vacuum is left for 5 minutes. Put the battery cells that have been left in vacuum and sealed for a time in a tunnel oven at 25°C for 8 hours at room temperature; transfer the cells that have been left for the first time to a high-temperature tunnel oven at 60°C Perform high-temperature standing, and set the standing time to 5 hours; perform normal-high temperature shock cycle operation according to the method of normal temperature standing to high temperature standing, cycle the above normal temperature standing and high temperature standing steps, and set the number of cycles to 2 times; After completing the above-mentioned impact cycle operation steps, the cells were transferred to a high-temperature static room at 40°C, and vibrated on a low-frequency ...

Embodiment 2

[0062] Place the battery cell that has just been injected with electrolyte but has not been sealed once in the vacuum box. The vacuum box is divided into three stages of vacuuming process. After the vacuuming is completed, the vacuum is left for 10 minutes. Put the battery cells that have been placed in vacuum and sealed once in a tunnel oven at 30°C at room temperature for 10 hours; transfer the cells that have been left to stand for the first time to a high-temperature tunnel oven at 80°C Perform high-temperature standing, and set the standing time to 8 hours; perform normal-high temperature shock cycle operation according to the method of normal-temperature standing to high-temperature standing, and cycle the above-mentioned normal-temperature standing and high-temperature standing steps, and the number of cycles is set to 5 times; After completing the above-mentioned impact cycle operation steps, transfer the cell to a high-temperature static room at 50°C, and vibrate on a ...

Embodiment 3

[0064] Place the battery cell that has just been injected with electrolyte but has not been sealed once in the vacuum box. The vacuum box is divided into three stages of vacuuming process. After the vacuuming is completed, the vacuum is left for 8 minutes. Put the battery cells that have been placed in vacuum and sealed once in a tunnel oven at 27°C at room temperature for 9 hours; transfer the cells that have been left to stand for the first time to a high-temperature tunnel oven at 70°C Perform high-temperature standing, and set the standing time to 6 hours; perform normal-high temperature shock cycle operation according to the method of normal-temperature standing to high-temperature standing, and cycle the above-mentioned normal-temperature standing and high-temperature standing steps, and the number of cycles is set to 3 times; After completing the above-mentioned impact cycle operation steps, the cells were transferred to a high-temperature static room at 45°C, and vibrat...

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Abstract

The invention provides a high-voltage lithium ion battery, a battery pole piece and an infiltration method thereof. The infiltrating method of the high-voltage lithium ion battery pole piece comprises the following steps: carrying out sectional type vacuumizing operation on a battery cell injected with electrolyte so as to infiltrate the battery cell; carrying out primary sealing operation on the infiltrated battery cell; carrying out primary standing operation on the sealed battery cell at a first preset temperature; carrying out secondary standing operation on the battery cell after the primary standing operation at a second preset temperature; performing impact cycle operation on the battery cell after the secondary standing operation at a first preset temperature and a second preset temperature in sequence; and carrying out vibration shelving operation on the battery cell after the impact cycle at a third preset temperature. The infiltration method can improve the liquid absorption capacity of the high-compaction pole piece, prolong the calendar life of the lithium battery and improve the safety performance of the lithium battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage lithium-ion battery, battery pole pieces and an infiltration method thereof. Background technique [0002] As a "rocking chair" secondary battery, compared with traditional secondary batteries, lithium-ion batteries have the advantages of high energy density, high discharge voltage, small self-discharge, no memory effect, and low environmental pollution. They are widely used in 3C electronic products, portable electronic equipment, electric tools, electric vehicles, military industry, aerospace and other fields. Especially in recent years, the country has vigorously promoted new energy vehicles, and the demand for lithium batteries has increased dramatically. As people's requirements for the cruising range of electric vehicles continue to increase, how to improve the energy density of lithium batteries has become the focus of research. At this stage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/609H01M50/636H01M4/13H01M10/0525H01M10/058
CPCH01M10/058H01M10/0525H01M4/13Y02P70/50Y02E60/10
Inventor 戴建勇刘志伟曾贤华
Owner HUIZHOU HENGTAI TECH
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