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Formation method for high-voltage lithium ion flexibly packaged battery

A chemical formation method and soft-pack battery technology, which is applied in the field of lithium-ion batteries, can solve problems such as easy gas generation and battery flatulence, and achieve the effects of reducing impact, ensuring liquid retention and hardness, and improving electrical performance and safety

Active Publication Date: 2017-05-17
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for forming a high-voltage lithium-ion soft-pack battery, which solves the technical problem that the high-voltage lithium-ion soft-pack battery is prone to gas generation in the prior art and causes battery flatulence

Method used

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  • Formation method for high-voltage lithium ion flexibly packaged battery

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The formation method of the high-voltage lithium-ion soft pack battery of this embodiment comprises the following steps:

[0030] S1. Put the soft-packed cells that have been injected into the vacuum for 12 hours, and then vacuum seal. This process ensures the full infiltration of the electrolyte and is conducive to the completion of the formation process. Put the sealed cells into the adjustable In the pressure fixture, set the fixture pressure to 0.1MPa, and the temperature is 45°C, charge with the first current of 0.02C to the first cut-off voltage of 3.8v, and leave it for 10min;

[0031] S2. On the basis of step S1, adjust the clamp pressure to 0.05MPa, and at a temperature of 45°C, charge the battery with a second current of 0.05C to a second cut-off voltage of 4.4v, and leave it for 10 minutes;

[0032] S3. On the basis of step S2, adjust the clamp pressure to 0.02MPa, and at a temperature of 55°C, charge with the third current of 0.1C to a full-state voltage of ...

Embodiment 2

[0038] The formation method of the high-voltage lithium-ion soft pack battery of this embodiment comprises the following steps:

[0039] S1. Put the soft-packed cells that have been injected into the vacuum for 12 hours, and then vacuum seal. This process ensures the full infiltration of the electrolyte and is conducive to the completion of the formation process. Put the sealed cells into the adjustable In the pressure fixture, set the fixture pressure to 0.05MPa, and the temperature is 45°C, charge with the first current of 0.02C to the first cut-off voltage of 3.8v, and leave it for 10min;

[0040] S2. On the basis of step S1, adjust the clamp pressure to 0.05MPa, and at a temperature of 45°C, charge with the second current of 0.05C to the second cut-off voltage of 4.2v, and leave for 10min;

[0041] S3. On the basis of step S2, adjust the clamp pressure to 0.02MPa, and at a temperature of 55°C, charge with the third current of 0.1C to a full-state voltage of 4.7v, and leave...

Embodiment 3

[0047] The formation method of the high-voltage lithium-ion soft pack battery of this embodiment comprises the following steps:

[0048] S1. Put the soft-packed battery cells that have been injected into the open vacuum for 8 hours, and then vacuumize the seal. This process ensures the full infiltration of the electrolyte and is conducive to the completion of the formation process. Put the sealed battery cells into the adjustable In the pressure fixture, set the fixture pressure to 0.05MPa and the temperature to 40°C, charge with the first current of 0.01C to the first cut-off voltage of 3.5v, and leave it for 8min;

[0049] S2. On the basis of step S1, adjust the clamp pressure to 0.03MPa, and at a temperature of 40°C, charge with a second current of 0.03C to a second cut-off voltage of 4.2v, and leave for 8 minutes;

[0050] S3. On the basis of step S2, adjust the clamp pressure to 0.01MPa, and at a temperature of 50°C, charge with the third current of 0.05C to a full-state ...

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Abstract

The invention provides a formation method for a high-voltage lithium ion flexibly packaged battery, and relates to the technical field of a lithium ion battery. The formation method comprises the steps of forming an opening in a flexibly packaged cell after the cell is completely injected with an electrolyte, and laying up the cell in a vacuum state for 8-24h, then sealing the opening, mounting a clamp, adjusting pressure and temperature, taking a first current for charging until reaching a first cut-off voltage, and laying up; then adjusting the pressure and temperature, performing two times of charging, discharging, re-charging and re-discharging, and then completing the formation. By adoption of the formation method for the high-voltage lithium ion flexibly packaged battery, a relatively uniform solid electrolyte interphase film (SEI film) can be formed on the surface of the electrode, the problem of battery gas expansion is solved, and the cycling performance of the battery can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a formation method of a high-voltage lithium-ion soft pack battery. Background technique [0002] In recent years, with the promotion and application of lithium-ion batteries in new energy vehicles, high-voltage soft-pack lithium-ion power batteries have higher energy density and longer cruising range, which has prompted the development of high-voltage soft-pack lithium-ion batteries. Market demand for high energy density and high safety. Moreover, people are paying more and more attention to the electrical performance, safety and cost of high-voltage soft-pack lithium-ion batteries, which also put forward higher requirements for battery manufacturers. [0003] For the production of high-voltage soft-pack lithium-ion batteries, the formation method is very critical, which directly affects the consistency and electrical performance of the battery, and determines the...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 陈方高玉仙徐平红
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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