Charging method and device

A charging method and charging device technology, which are applied to circuit devices, battery circuit devices, and secondary battery charging/discharging directions, can solve the problems of shortening battery life, shortening the duration of constant current charging, battery capacity attenuation, etc. Enhanced stability, shortened charging time, and reduced polarization effects

Inactive Publication Date: 2017-05-31
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Using the method in the prior art to charge the battery, as the number of charging increases, the polarization of the battery gradually becomes serious, resulting in a faster rise in voltage when charging with a constant current, and thus a shorter duration of constant current charging, and When charging with a constant voltage, the current drop rate will slow down, and the constant voltage charging time will become longer, which will increase the structural instability of the battery cell material at a higher voltage, which will lead to serious attenuation of the battery capacity and shorten the battery life. life span

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment 1

[0055] figure 1 The flow chart of Embodiment 1 of the charging method provided by the embodiment of the present invention is as follows: figure 1 As shown, the charging method of this embodiment may specifically include the following steps:

[0056] 101. Charge the battery with a constant current until the battery reaches the cut-off voltage and stop.

[0057] In the embodiment of the present invention, different positive electrode materials and negative electrode materials are used to make battery cells. Due to the different properties of the battery cell materials themselves, the performance of the battery is jointly determined. As the battery is charged and discharged many times, the chemical changes in the cells inside the battery will gradually accumulate. Therefore, in the case where the performance of the battery is difficult to change, in order to reduce the probability that the polarization phenomenon of the battery in the battery will damage the stability of the ba...

Embodiment 2

[0078] Figure 4 The flow chart of the second embodiment of the charging method provided by the embodiment of the present invention, such as Figure 4 As shown, the charging method of this embodiment may specifically include the following steps:

[0079] 201. Charge the battery with a constant current until the battery reaches the cut-off voltage and stop.

[0080] For the specific process of step 201, refer to the description of step 101 in the first embodiment above. The principle and implementation process are the same in the embodiment of the present invention, and will not be repeated here.

[0081] 202. Calculate the sum of the preset current adjustment value and the cut-off current used in each charging process in the i-th charging stage as the cut-off current used in each charging process in the i+1th charging stage.

[0082] It can be understood that the current adjustment value is a value used to adjust the cut-off current. In the embodiment of the present inventio...

Embodiment approach 1

[0094]Choose 4 batteries of the same type, numbered No. 1, No. 2, No. 3 and No. 4. Batteries 1 to 4 are charged with the same data during the constant current charging phase. In the constant voltage charging stage, the cut-off current of the No. 1 battery and the No. 2 battery is set to 0.025C, and the cut-off current of the No. 3 battery and the No. 4 battery is set to 0.05C. Perform 800 cycles on the 4 batteries respectively, and record the remaining capacity of each battery in each cycle.

[0095] Table 1 is a comparison table about cut-off current and remaining capacity in Embodiment 1, Figure 5 It is a comparison chart about the number of cycles and capacity retention in Embodiment 1, such as Figure 5 As shown in Table 1, as the cycle progresses, especially when the number of cycles increases, the remaining capacity of the battery with a larger cut-off current is greater than that of a battery with a smaller cut-off current. It can be seen from the data in Table 1 th...

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Abstract

The embodiment of the invention provides a charging method and device. The charging method provided by the embodiment of the invention comprises N charging stages, wherein each charging stage comprises M charging processes; N is an integer greater than or equal to 2; M is an integer greater than or equal to 1; each charging process comprises the steps of charging a battery with constant current until the battery reaches cutoff voltage and charging the battery with constant voltage until the battery reaches cutoff current, wherein the cutoff current used in the charging processes in the ith charging stage is smaller than that used in the charging processes in the (i+1)th charging stage; and the value range of i is [1, N-1]. According to the charging method and device, the polarization phenomenon of the battery is reduced through adjusting the magnitude of the cutoff current and the life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a charging method and device. Background technique [0002] With the continuous development and progress of society, more and more products use electric energy as a power source, such as electronic equipment, electric vehicles, etc. Advances in technology have diversified the functions of products and increased power consumption. Since the rated capacity of the battery is fixed, the frequency of charging the battery will also increase accordingly. With the limitation of the production process level of the battery cell, the number of cycles that the battery can be used is limited, and the increase in the frequency of charging directly affects the service life of the product where the battery is located. [0003] The method of charging the battery in the prior art usually adopts the method of constant current and constant voltage charging, uses a constant current to charge the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H02J7/00
CPCH01M10/44H01M10/448H02J7/0069Y02E60/10
Inventor 吴飞王可飞袁庆丰金娟
Owner DONGGUAN AMPEREX TECH
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