Charging method for lithium ion battery

A lithium-ion battery and charging method technology, applied in the field of lithium-ion batteries, can solve the problems of poor battery cell cycle performance, rise in battery internal temperature, and reduced charging current, so as to improve cycle reversibility, reduce temperature rise, and prevent The effect of lithium analysis

Inactive Publication Date: 2015-11-11
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patents CN102810700A and CN102195103A disclose multi-step charging methods. As the voltage increases, the charging current decreases; Lithium analysis, although the cycle performance is also improved to a certain extent, but due to the multi-step constant current charging, the charging current gradually decreases with the increase of capacity, and the cycle performance of the battery cell becomes worse.
At the same time, continuous charging will cause the internal temperature of the battery to rise continuously, increasing safety risks
With the increase in the demand for battery energy density and charging speed, the current two-step charging method of constant current plus constant voltage or the multi-step charging method of gradually decreasing current can no longer meet people's needs.

Method used

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  • Charging method for lithium ion battery
  • Charging method for lithium ion battery
  • Charging method for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A battery made of positive electrode (lithium cobaltate), negative electrode, diaphragm, electrolyte and packaging bag, and then assembled, formed and aged. Under normal temperature conditions, the fully charged capacity of this battery is 2000mAh. According to this capacity, in the following, when the charging current is 1C, it is equivalent to 2A. Charge the battery as follows:

[0039] Using current I a Charge the battery to Cap with a constant current of 1A a , let stand for 1min;

[0040] Using current I b Continue to charge the battery at a constant current to Cap for 4A b , let stand for 1min;

[0041] Using current I c Continue to charge the battery with constant current for 0.5A Cap c , let stand for 1min;

[0042] When the battery reaches 4.4V, switch to constant voltage charging until the current drops to 0.15A.

[0043] where Cap a About 10% full charge capacity, Cap b About 60% full charge capacity and Cap c Respectively approximately 90% full c...

Embodiment 2

[0045] A battery made of positive electrode (lithium cobaltate), negative electrode, diaphragm, electrolyte and packaging bag, and then assembled, formed and aged. Under normal temperature conditions, the full charge capacity of this battery is 2000mAh. Charge the battery as follows:

[0046] Using current I a Charge the battery to Cap with a constant current of 1A a , let stand for 1min;

[0047] Using current I b Continue to charge the battery at a constant current to Cap for 4A b , let stand for 1min;

[0048] Using current I c Continue to charge the battery with constant current for 0.5A Cap c , let stand for 1min;

[0049] When the battery reaches 4.4V, switch to constant voltage charging until the current drops to 0.15A.

[0050] where Cap a About 20% full charge capacity, Cap b About 60% full charge capacity and Cap c Respectively approximately 90% full charge capacity.

Embodiment 3

[0052] A battery made of positive electrode (lithium cobaltate), negative electrode, diaphragm, electrolyte and packaging bag, and then assembled, formed and aged. Under normal temperature conditions, the full charge capacity of this battery is 2000mAh. Charge the battery as follows:

[0053] Using current I a Charge the battery to Cap with a constant current of 1A a , let stand for 1min;

[0054] Using current I b Continue to charge the battery at a constant current to Cap for 4A b , let stand for 1min;

[0055] Using current I c Continue to charge the battery with constant current for 0.5A Cap c , let stand for 1min;

[0056] When the battery reaches 4.4V, switch to constant voltage charging until the current drops to 0.15A.

[0057] where Cap a About 30% full charge capacity, Cap b About 60% full charge capacity and Cap c Respectively approximately 90% full charge capacity.

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Abstract

A charging method for a lithium ion battery comprises the following steps that constant current charging is carried out on the battery with the current Ia to the capacity of 2-10%, and then standing is carried out for time ta; constant current charging is continuously carried out on the battery with the current Ib to the capacity of 40-70%, and then standing is carried out for time tb; constant current charging is continuously carried out on the battery with the current Ic to the capacity of 80-95%, and then standing is carried out for time tc; the battery is charged with the constant voltage to the battery capacity of 100%, wherein Ib is larger than Ia and Ic. By means of the charging method, temperature rising of a battery core in the large-rate charging process is effectively reduced, bleeding of lithium in the charging process is effectively prevented, the circulation reversibility of the battery core is improved, and the circulation performance is improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a fast multi-step charging method for lithium ion batteries. Background technique [0002] With the continuous expansion of the application range of lithium-ion batteries, the requirements for its application conditions are becoming more and more stringent. What follows is that the lithium-ion battery industry must solve, how to improve the cycle requirements of lithium-ion batteries at low temperatures; how to solve the problem of temperature rise that may affect the cycle performance of lithium-ion batteries during the fast charging process has become an important challenge . [0003] One of the cheapest solutions is to improve battery cycle performance by improving how the battery is charged. Patents CN102810700A and CN102195103A disclose multi-step charging methods. As the voltage increases, the charging current decreases; Although lithium analysis can improve the cycl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M4/525
CPCH01M4/525H01M10/44Y02E60/10
Inventor 王可飞陈杰耿继斌
Owner NINGDE AMPEREX TECH
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