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Secondary battery charging method

A charging method and secondary battery technology, which are applied in the direction of secondary battery charging/discharging, secondary battery, and secondary battery repair/maintenance, etc. problems, to improve battery performance and user experience, increase charging speed, and slow down temperature rise.

Inactive Publication Date: 2018-07-06
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this charging method will cause the accumulation of battery polarization, especially with the rise of the current fast charging technology, in order to increase the charging speed of the secondary battery, the current used in the charging process is increasing, which aggravates the battery As a result, the battery charging temperature rises sharply due to the increase in battery polarization, which not only affects the user experience of portable devices, but also may affect battery performance and even bring safety hazards

Method used

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Examples

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Embodiment 1

[0046] see figure 2 , in an environment of 25°C, use the secondary battery charging method of the present invention to charge the above-mentioned battery, the specific steps are as follows:

[0047] 1) Charge the battery with a constant current of 2C, and the charging time is 9s;

[0048] 2) Stop charging and let the battery stand still for 0.5s;

[0049] 3) Discharge the battery with a constant current of 0.05C, and the discharge time is 0.5s;

[0050] 4) Stop discharging and let the battery stand for 0.5s;

[0051] 5) Repeat steps 1) to 4) until the battery voltage reaches 4.35V;

[0052] 6) Charge the battery with a constant voltage of 4.35V until the battery current reaches 0.05C.

[0053] The steps of Examples 2-11 are basically the same as those of Example 1, the only difference is the relevant parameters, and the specific parameters of each example are shown in Table 1.

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Abstract

The invention provides a secondary battery charging method. The secondary battery charging method comprises the steps of carrying out battery charging at a constant charging current I1 for the charging time t1; stopping charging and performing battery standing for the standing time t2; carrying out battery discharging at a constant discharging current I2 for the discharging time t3; stopping discharging and performing battery standing for the standing time t4; 5) repeatedly executing the above steps until the battery voltage reaches the charging cut-off voltage V0; and performing battery charging at the constant voltage V0 until the battery current reaches a charging cut-off current I3. Compared with the prior art, by virtue of adoption of wide positive pulse current and narrow negative pulse current with intervals, and by introducing a standing charging mode in the positive pulse and the negative pulse, accumulation of battery polarization is lowered effectively, heat generation of the battery is reduced, temperature rise in the battery charging process is relieved, and potential safety hazard caused by battery temperature rise is prevented; and meanwhile, the charging speed is accelerated, and the battery performance and user experience are obviously improved.

Description

technical field [0001] The invention belongs to the field of secondary batteries, and more specifically relates to a method for charging a secondary battery. Background technique [0002] When charging a secondary battery, factors such as the internal resistance of the battery itself and the accumulation of polarization caused by charging cause it to continue to generate heat and increase in temperature during the charging process. [0003] In order to solve the problem of temperature rise when charging secondary batteries, researchers have improved battery materials and battery structures over the years to reduce battery internal resistance, thereby reducing charging temperature rise, but this has also resulted in increased battery costs and increased the complexity of the related process. In fact, taking the polarization accumulation of battery charging as an entry point, without changing the original formula and structure of the battery, by changing the charging conditio...

Claims

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Application Information

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IPC IPC(8): H01M10/44H02J7/00
CPCH01M10/44H01M10/443H02J7/00Y02E60/10
Inventor 方占召党琦高潮郑强
Owner NINGDE AMPEREX TECH
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