A kind of precharging method of cylindrical lithium battery

A lithium-ion battery, pre-charging technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, climate sustainability, etc., can solve the problems of self-discharge and water content of lithium-ion batteries, reduce the self-discharge rate, improve the battery cell performance, improve the effect of blackening

Active Publication Date: 2021-07-02
山西中烨昌源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention overcomes the deficiencies in the prior art, solves the current lithium-ion battery self-discharge and moisture problems, and provides a cylindrical lithium battery pre-charging method

Method used

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  • A kind of precharging method of cylindrical lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of cylindrical lithium battery precharging method is carried out according to the following steps:

[0019] 1) Take liquid injection-laser welding-sealing-complete the above-mentioned steps and cover the cylindrical battery cell, and the film-coated battery cell is aged at 23°C and relative humidity 25% and stored for 12 hours, then transferred to next process.

[0020] 2) Transfer the encapsulated battery cells that have completed the above process to the charging cabinet, and the charging and sending process on the cabinet will first sleep for 5 minutes and then charge with a constant current of 1C for 30s. After resting for 5 minutes, turn to the next procedure.

[0021] 3) After the above-mentioned charging is completed, put the cell into the cabinet and carry out aging at room temperature 23°C and relative humidity 25% for 40 hours, and then transfer to the next process.

[0022] 4) Put the batteries that have been aged on the cabinet again to charge and s...

Embodiment 2

[0030] A kind of cylindrical lithium battery precharging method is carried out according to the following steps:

[0031] 1) Take liquid injection-laser welding-sealing-complete the above-mentioned processes and cover the cylindrical cells, and the coated cells are aged at 27°C and relative humidity of 20% and stored for 15 hours, then transferred to next process.

[0032] 2) Transfer the encapsulated battery cells that have completed the above process to the charging cabinet, and the charging and sending process on the cabinet will first sleep for 3 minutes and then charge with a constant current of 1C for 50s. After resting for 4 minutes, turn to the next procedure.

[0033] 3) After the above-mentioned charging is completed, put the cell into the cabinet and carry out aging at room temperature 27°C and relative humidity 25% for 30 hours, and then transfer to the next process.

[0034] 4) Put the batteries that have been aged on the cabinet again to charge and send the pro...

Embodiment 3

[0041] A kind of cylindrical lithium battery precharging method is carried out according to the following steps:

[0042] 1) Take liquid injection-laser welding-sealing-complete the above-mentioned processes and cover the cylindrical cells, and the coated cells are aged at 27°C and relative humidity of 20% and stored for 15 hours, then transferred to next process.

[0043] 2) Transfer the encapsulated battery cells that have completed the above process to the charging cabinet, and the charging and sending process on the cabinet will first sleep for 5 minutes and then charge with a constant current of 1C for 36s. After resting for 5 minutes, turn to the next procedure.

[0044] 3) After the above-mentioned charging is completed, put the cell into the cabinet and carry out aging at room temperature 27°C and relative humidity 25% for 30 hours, and then transfer to the next process.

[0045]4) Put the batteries that have been aged on the cabinet again to charge and send the proc...

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Abstract

The invention discloses a precharging method for a cylindrical lithium battery, which relates to the technical field of lithium electronic battery manufacturing technology; solves the current problems of self-discharge and water content of the lithium ion battery; and comprises the steps of using a constant current of 1C after the packaged battery cell is left to stand Charge for 30-50s, rest for 3-5mins, then put it aside for 30-50h at 23-27℃ and relative humidity ≤30%, then charge at 0.05-0.1C constant current for 50-60mins, sleep for 3-5mins, then charge at 0.3C Constant current charging to a constant voltage of 4.2V, a cut-off current of 20mA, and a secondary rest period of 3-5 minutes to perform chemical formation and shaping operations on the battery cell; the invention allows the metal ions in the lithium battery to be deposited on the negative electrode, which can effectively reduce the metal ion concentration. It precipitates at one point and forms dendrites, leading to micro-short circuit; secondly, it can effectively decompose the water in the electrolyte, improve the blackening of the bottom of the battery cell, and improve the performance of the battery cell.

Description

technical field [0001] The invention relates to the technical field of lithium electronic battery manufacturing technology, in particular to a method for precharging a cylindrical lithium battery. Background technique [0002] Pre-charging is an important process in the production process of lithium batteries. During pre-charging, a passivation layer is formed on the surface of the negative electrode, that is, a solid electrolyte interface film (SEI film). The quality of the SEI film directly affects the cycle life and stability of the battery. , self-discharge, safety and other electrochemical properties, to meet the secondary battery sealing "maintenance-free" requirements, but the SEI film formed by different pre-charging processes is different, and the impact of pre-charging on the performance of the battery is also very different . The traditional low-current pre-charging method is conducive to the formation of a stable SEI film, but long-term low-current charging will...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 唐垒贺奇峰赵思李丹杨丽芳连攀
Owner 山西中烨昌源科技有限公司
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