Lithium iron phosphate power battery formation method

Abstract

The invention discloses a lithium iron phosphate power battery formation method.The method particularly includes following steps: (1), placing a battery after liquid injection in an environment with high temperature of 39-45 DEG C, using a vacuum formation device to vacuumize the inside of the battery, shelving to enable a pole piece and a diaphragm to fully absorb liquid and to be soaked, and charging; (2), charging the battery by stages, and using the vacuum formation device to vacuumize the inside of the battery in the charging process to complete formation; (3), after formation is completed, using a clamp to seal the battery, and aging the battery at high temperature; (4), after aging is completed, vacuumizing the battery, maintaining pressure for 1h, sealing the battery by knocking a steel ball, and performing capacity grading.By using the method, inside environment of a battery shell can be improved effectively, and bulging of the battery in the process of use is avoided, so that performance attenuation of the battery is delayed, a stable SEI film is generated, electric performance and safety of the battery are improved, formation time is shortened, and production efficiency is improved.

Description

technical field

[0001] The invention relates to the technical field of lithium batteries, in particular to a method for forming a lithium iron phosphate power battery. Background technique

[0002] Battery (Battery) refers to a cup, tank or other container or part of a composite container that contains an electrolyte solution and a metal electrode to generate current, and is a device that converts chemical energy into electrical energy. It has positive pole and negative pole. Using the battery as the energy source can obtain stable voltage, stable current, stable power supply for a long time, and a current that is little affected by the outside world, and the battery structure is simple, easy to carry, easy to charge and discharge, and is not affected by the external climate and temperature. Influence, stable and reliable performance, play a great role in all aspects of modern social life.

[0003] With the rapid development of the electric vehicle industry, the demand for...

Examples

Embodiment 1

[0018] In the embodiment of the present invention, a lithium iron phosphate power battery formation method, the specific steps are as follows:

[0019] (1) Put the liquid-filled battery at a high temperature of 39°C, use a vacuum formation device to keep the internal vacuum of the battery at 0.03MPa, and leave it for 24 hours to fully absorb the liquid and infiltrate the pole piece and diaphragm, and then charge;

[0020] (2) Charge the battery in stages. During the charging process, use a vacuum formation device to keep the internal vacuum of the battery between -0.03MPa to complete the formation;

[0021] (3) After the formation is completed, the battery is sealed with a clamp, and placed at a high temperature of 39°C for aging, and the aging time is 24 hours;

[0022] (4) After the aging is completed, vacuumize the battery and keep the pressure for 1 hour, and then seal the battery with a steel ball, and then carry out capacity separation.

Embodiment 2

[0024] In the embodiment of the present invention, a lithium iron phosphate power battery formation method, the specific steps are as follows:

[0025] (1) Put the liquid-filled battery at a high temperature of 43°C, use a vacuum formation device to keep the internal vacuum of the battery at 0.035MPa, and leave it for 36 hours to fully absorb the liquid and infiltrate the pole piece and diaphragm, and then charge;

[0026] (2) Charge the battery in stages. During the charging process, use a vacuum formation device to keep the internal vacuum of the battery between -0.035MPa to complete the formation;

[0027] (3) After the formation is completed, the battery is sealed with a clamp, and placed at a high temperature of 43°C for aging, and the aging time is 48 hours;

[0028] (4) After the aging is completed, vacuumize the battery and keep the pressure for 1 hour, and then seal the battery with a steel ball, and then carry out capacity separation.

Embodiment 3

[0030] In the embodiment of the present invention, a lithium iron phosphate power battery formation method, the specific steps are as follows:

[0031] (1) Put the liquid-filled battery at a high temperature of 45°C, use a vacuum forming device to keep the internal vacuum of the battery at 0.04MPa, and leave it for 48 hours to fully absorb the liquid and infiltrate the pole piece and diaphragm, and then charge;

[0032] (2) Charge the battery in stages. During the charging process, use a vacuum formation device to keep the internal vacuum of the battery between -0.04MPa to complete the formation;

[0033] (3) After the formation is completed, the battery is sealed with a clamp, and placed at a high temperature of 45°C for aging, and the aging time is 72 hours;

[0034] (4) After the aging is completed, vacuumize the battery and keep the pressure for 1 hour, and then seal the battery with a steel ball, and then carry out capacity separation.

technical field

[0001] The invention relates to the technical field of lithium batteries, in particular to a method for forming a lithium iron phosphate power battery. Background technique

[0002] Battery (Battery) refers to a cup, tank or other container or part of a composite container that contains an electrolyte solution and a metal electrode to generate current, and is a device that converts chemical energy into electrical energy. It has positive pole and negative pole. Using the battery as the energy source can obtain stable voltage, stable current, stable power supply for a long time, and a current that is little affected by the outside world, and the battery structure is simple, easy to carry, easy to charge and discharge, and is not affected by the external climate and temperature. Influence, stable and reliable performance, play a great role in all aspects of modern social life.

[0003] With the rapid development of the electric vehicle industry, the demand for...

Examples

Embodiment 1

[0018] In the embodiment of the present invention, a lithium iron phosphate power battery formation method, the specific steps are as follows:

[0019] (1) Put the liquid-filled battery at a high temperature of 39°C, use a vacuum formation device to keep the internal vacuum of the battery at 0.03MPa, and leave it for 24 hours to fully absorb the liquid and infiltrate the pole piece and diaphragm, and then charge;

[0020] (2) Charge the battery in stages. During the charging process, use a vacuum formation device to keep the internal vacuum of the battery between -0.03MPa to complete the formation;

[0021] (3) After the formation is completed, the battery is sealed with a clamp, and placed at a high temperature of 39°C for aging, and the aging time is 24 hours;

[0022] (4) After the aging is completed, vacuumize the battery and keep the pressure for 1 hour, and then seal the battery with a steel ball, and then carry out capacity separation.

Embodiment 2

[0024] In the embodiment of the present invention, a lithium iron phosphate power battery formation method, the specific steps are as follows:

[0025] (1) Put the liquid-filled battery at a high temperature of 43°C, use a vacuum formation device to keep the internal vacuum of the battery at 0.035MPa, and leave it for 36 hours to fully absorb the liquid and infiltrate the pole piece and diaphragm, and then charge;

[0026] (2) Charge the battery in stages. During the charging process, use a vacuum formation device to keep the internal vacuum of the battery between -0.035MPa to complete the formation;

[0027] (3) After the formation is completed, the battery is sealed with a clamp, and placed at a high temperature of 43°C for aging, and the aging time is 48 hours;

[0028] (4) After the aging is completed, vacuumize the battery and keep the pressure for 1 hour, and then seal the battery with a steel ball, and then carry out capacity separation.

Embodiment 3

[0030] In the embodiment of the present invention, a lithium iron phosphate power battery formation method, the specific steps are as follows:

[0031] (1) Put the liquid-filled battery at a high temperature of 45°C, use a vacuum forming device to keep the internal vacuum of the battery at 0.04MPa, and leave it for 48 hours to fully absorb the liquid and infiltrate the pole piece and diaphragm, and then charge;

[0032] (2) Charge the battery in stages. During the charging process, use a vacuum formation device to keep the internal vacuum of the battery between -0.04MPa to complete the formation;

[0033] (3) After the formation is completed, the battery is sealed with a clamp, and placed at a high temperature of 45°C for aging, and the aging time is 72 hours;

[0034] (4) After the aging is completed, vacuumize the battery and keep the pressure for 1 hour, and then seal the battery with a steel ball, and then carry out capacity separation.

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