Rapid formation process of lithium iron phosphate battery

A lithium iron phosphate battery, fast technology, applied in the field of lithium-ion batteries, can solve the problems of low efficiency and long time consumption, achieve high efficiency, low energy consumption, and ensure battery performance

Inactive Publication Date: 2016-09-07
LVCHI AUTO TECH SHANGHAI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of long time-consuming and low efficiency of traditional formation process, the present invention discloses a rapid formation process of lithium iron phosphate battery, which includes the following steps:

Method used

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  • Rapid formation process of lithium iron phosphate battery
  • Rapid formation process of lithium iron phosphate battery

Examples

Experimental program
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Effect test

Embodiment 1

[0033] In this embodiment, a square steel shell 40Ah lithium iron phosphate power battery is taken as an example, and the specific formation steps are as follows:

[0034] (1) After the battery assembly is completed, vacuumize and inject liquid three times, each injection volume is 110g, and seal;

[0035] (2) Put the battery in an incubator at 45°C for 12 hours, turn the battery over every 2 hours, and place the battery with all 6 sides facing down for 2 hours;

[0036] (3) After shelving is completed, the battery is ultrasonically treated for 15 minutes, the power of the ultrasonic treatment equipment is 100W, and the frequency of the ultrasonic wave is 15KHz;

[0037] (4) Measure the voltage and internal resistance of the battery, and record it, and the battery that does not meet the requirements will not be formed in the cabinet;

[0038] (5) Put the battery on the cabinet and charge it according to the following charging methods:

[0039] ①The battery is charged to 3.2V...

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Abstract

The invention discloses a rapid formation process of a lithium iron phosphate battery, which comprises the following steps: after the battery is assembled, the battery is vacuumed and injected into the electrolyte in stages, and the seal is sealed; Flip or turn the battery so that each side of the battery faces down and place it for a certain period of time; after the storage is completed, ultrasonically treat the battery for 10-20 minutes; put the battery on the cabinet, charge and activate it in a small current stepwise manner, and add intermittent pulse discharge; After the charging is completed, the battery is deflated and vacuumized once in the glove box, then sealed, aged, and divided. The present invention first allows the electrolyte to fully infiltrate the battery diaphragm and the positive and negative electrodes, and then adopts a stepwise charging with a large current and cooperates with the method of intermittent pulse discharge, which not only greatly shortens the time of the formation process, reduces the energy consumption of the equipment, and completes the formation The performance of the final battery is excellent, no difference from the battery using the traditional formation process.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a rapid formation process of lithium iron phosphate batteries. Background technique [0002] The production process of lithium-ion batteries includes processes such as slurry mixing, coating, rolling, slicing, lamination (winding), assembly, liquid injection, and formation, among which formation is a very important link that determines the performance of lithium batteries. [0003] The impact of the formation process on the lithium battery mainly includes: 1. It affects the formation of the SEI film of the negative electrode sheet, its stability and compactness, and then affects the cycle performance of the lithium battery; 2. It affects the capacity of the lithium battery; 3. Incorrect formation The process will directly lead to lithium precipitation at the negative electrode of the lithium battery, forming "lithium dendrites", which will seriously thre...

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 程海洋
Owner LVCHI AUTO TECH SHANGHAI CO LTD
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