Method for improving charging efficiency of secondary battery

A technology of secondary battery and charging efficiency, applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve the problems of uneven reaction of active ingredients, low reaction efficiency, low charging efficiency, etc., and achieve stable combination. High performance, reduce loss and improve charging efficiency

Active Publication Date: 2020-02-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low charging efficiency of the existing secondary rechargeable battery, easy concentration difference during the charging process, the formation of an enrichment layer to o

Method used

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  • Method for improving charging efficiency of secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The commercially available Shenzhen Liyuan 2477 lithium-ion battery (a secondary lithium battery with a standard battery capacity of 180mAh) was selected as the subject of the test to carry out the technical solution test of the present invention. The Shenzhen Liyuan 2477 lithium-ion battery selected in this example was from the same batch A new unopened battery that has been stored for 7 months at the factory.

[0044] First, two symmetrical DC electromagnets are set outside the Shenzhen Liyuan 2477 lithium-ion battery, and the constant magnetic field generated by the two symmetrical DC electromagnets is used as the source magnetic field to act as a boost to the Shenzhen Liyuan 2477 lithium-ion battery. Magnetic field, which promotes the magnetic field to act between the positive and negative electrodes of the battery, and α is 90° (after calculating the divergence of the magnetic field, α is 86-94°), stabilizing the Shenzhen Liyuan 2477 lithium-ion battery and the sour...

Embodiment 2

[0051] The specific steps are the same as the battery samples numbered S1C61 to S1C80 in Example 1. The difference is that the battery model is changed to Shenzhen Yunkai LIR1220 battery (a secondary lithium battery with a standard battery capacity of 8mAh) as the test subject to carry out the technical solution test of the present invention. The LIR1220 battery used in this example is a new unopened battery of the same batch that has been stored for 11 months. And numbers S2C1 to S2C20 are used as samples for applying a promoting magnetic field, and numbers S1N1 to S1N20 are samples for not applying a promoting magnetic field, and the same test as the battery samples of the embodiment numbers S1C61 to S1C80 is carried out (16mA charge and discharge / 2C charge and discharge) .

[0052] Tested:

[0053] The average capacitance retention rate of the samples numbered S2C1 to S2C20 reached more than 83%, while the average capacitance retention rate of the samples numbered S1N1 to ...

Embodiment 3

[0055] The specific steps are the same as those of the battery samples numbered S1C61 to S1C80 in Example 1. The difference is that the promoting magnetic field is adjusted. In this embodiment, the promoting magnetic field is formed by combining the time-varying electromagnetic field of an electromagnet and the constant magnetic fields of three permanent magnets. , the magnetic field strength acting between the positive and negative poles of the battery is 2.8-3.5T, where α 1 =0°,α 2 30°, 45° and 90° respectively. And numbers S3C1 to S3C20 are used as samples with a boosting magnetic field applied, and numbers S3N1 to S3N20 are samples without a boosting magnetic field applied, and the same test as the battery samples with the numbers S1C61 to S1C80 in the embodiment is carried out (16mA charge and discharge / 2C charge and discharge) .

[0056] Tested:

[0057] The average capacitance retention rate of samples numbered S3C1 to S3C20 reached over 86%, while the average capaci...

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Abstract

The invention relates to the field of secondary batteries, and in particular relates to a method for improving the charging efficiency of a secondary battery. According to the method, a source magnetic field is applied to the secondary battery; the source magnetic field acts between the positive electrode and the negative electrode of the secondary battery to form a promoting magnetic field; and under the action of the promoting magnetic field, the movement of some charged particles is accelerated to cause the charged particles to form the state of curvilinear motion. According to the invention, the formed promoting magnetic field is applied to effectively regulate and control the charging process of the secondary battery and improve the charging efficiency; concentration and particle enrichment in the battery are prevented under the effect of the promoting magnetic field, thereby improving the uniformity of the movement of the charged particles; the reaction area of the negative electrode is increased; the reduction reaction of the negative electrode during charging is improved, and the charging efficiency is improved; active components of the negative electrode can be effectivelyprotected, and loss and shedding thereof are reduced; and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to a method for improving the charging efficiency of the secondary battery. Background technique [0002] Batteries are one of the most common and used tools in daily life. They are classified into mercury batteries, lead-acid batteries, zinc-manganese batteries, lithium batteries, etc. according to their composition, and can be divided into Primary battery / primary battery, secondary battery / rechargeable battery, etc. Among them, secondary batteries are the most widely used and most frequently used, such as mobile phones, new energy vehicles, and various portable smart devices, which all use rechargeable secondary batteries. However, the current secondary batteries all have defects, and some defects are difficult or even impossible to improve and solve by existing technologies. [0003] For example, the batteries used in some existing mobile phones that claim to be able to achie...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/44
CPCH01M10/42H01M10/44Y02E60/10
Inventor 唐谊平侯广亚
Owner ZHEJIANG UNIV OF TECH
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