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Step-by-step charging method for lithium ion battery

A lithium-ion battery and charging method technology, applied in the field of lithium-ion batteries, can solve problems such as threats to battery safety performance, rise in battery internal temperature, and increase the possibility of lithium formation, so as to slow down the impact of lithium analysis and weaken the continuous accumulation Effect

Active Publication Date: 2012-12-05
DONGGUAN AMPEREX TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially under low temperature conditions, due to the decline in the ion and electronic conductivity of the lithium battery itself, the degree of polarization will increase during the charging process. The way of continuous charging will make this polarization more obvious, and increase the analysis The possibility of lithium formation, and the accumulation of lithium dendrites on the electrode surface will greatly threaten the safety performance of the battery; at the same time, continuous charging will cause the continuous accumulation of heat due to charging, resulting in the continuous rise of the internal temperature of the battery. When the temperature exceeds a certain limit, the performance of the battery will be limited, and the threat of safety risks will be increased.

Method used

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  • Step-by-step charging method for lithium ion battery
  • Step-by-step charging method for lithium ion battery
  • Step-by-step charging method for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The first step is to use a current of 5.55A to charge the battery at a constant current for 8 minutes, and then let it stand for 0.5 minutes.

[0030] Step 2: Use a current of 5A to continue charging the battery at a constant current for 6 minutes, then let it stand for 1 minute

[0031] Step 3: Use a current of 4.25A to continue to charge the battery at a constant current for 7 minutes, then let it stand for 1 minute

[0032] Step 4: Use a current of 4.25A for constant current charging to 4.2V and switch to constant voltage charging until the current drops to 0.15A.

[0033] Carry out charging test to lithium-ion battery according to above-mentioned method, test result sees table 1.

[0034] Table 1

[0035]

[0036] Combining Table 1 and Figure 1 to Figure 5 , the present invention can provide relaxation time for the battery in the step-by-step charging process, so as to weaken the influence of battery polarization; the present invention makes the heat product...

Embodiment 2

[0039] By calculation, we can calculate the relevant values ​​respectively, namely:

[0040] The first step is to use a current of 750mA to charge the battery with a constant current for 5 minutes, and then let it stand for 0.5 minutes..

[0041] The second step is to use a current of 500mA to continue to charge the battery at a constant current for 5.5min., and let it stand for 1min..

[0042] The third step is to use a current of 430mA to continue to charge the battery at a constant current for 5 minutes, and then let it stand for 1 minute..

[0043] The fourth step is to use a current of 400mA for constant current charging to 4.2V and turn to constant voltage charging until the current drops to 15mA.

[0044] Carry out charging test to lithium-ion battery according to the above method, the test results are shown in Table 2

[0045] Table 2

[0046]

[0047] Combining Table 2 and Figure 1 to Figure 4 and Figure 6 , the present invention can provide relaxation time...

Embodiment 3

[0050] By calculation, we can calculate the relevant values ​​respectively, namely:

[0051] The first step is to use a current of 750mA to charge the battery with a constant current for 11.5min., and then let it stand for 2.0min.

[0052] The fourth step is to use a constant current of 430mA to charge to 4.2V and turn to constant voltage charging until the current drops to 15mA.

[0053] The effect of fast charging can also be achieved.

[0054] Example 4

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Abstract

The present invention relates to the field of lithium ion batteries, and particularly to a step-by-step charging method for a lithium ion battery. The method comprises the following steps: 1, adopting a current Ia to carry out constant current charging on a battery to a capacity of Capa, wherein a standing time is ta; 2, adopting a current Ib to continuously carry out constant current charging on the battery to a capacity of Capb, wherein a standing time is tb; 3, adopting a current Ic to continuously carry out constant current charging on the battery to a capacity of Capc, wherein a standing time is tc; and 4, adopting a current Id to carry out constant current charging on the battery to a specified potential, and then carrying out constant voltage charging on the battery under the specified potential. According to the present invention, high temperature and low temperature performances of the battery can be improved without change of the original structure of the battery; and a high charging state can be achieved in a short time while temperature increase of the surface of the battery is relatively uniform so as to reduce temperature increase due to polarization during a rapid charging process and influence on battery performances by lithium precipitation.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a step-by-step charging method for a lithium-ion battery system capable of fast charging and discharging. 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 battery industry must solve how to improve the cycle requirements of lithium batteries at low temperatures; how to solve the problem of temperature rise that may affect cycle performance caused by lithium batteries during fast charging. These are both opportunities and challenges facing the industry. [0003] In order to solve the above problems, lithium battery workers have done a lot of work in changing the active material of the battery, the thickness of the current collector, and optimizing the composition of the electrolyte, so that the hig...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCY02E60/12Y02E60/10
Inventor 涂建刘凯周铁刚
Owner DONGGUAN AMPEREX TECH
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