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Method for acquiring pulse type charging optimal frequency

An acquisition method, pulse-type technology, applied in the direction of current collectors, electric vehicles, electrical components, etc., can solve the problems of high cost, long time-consuming, heavy workload, etc., and achieve the effect of short time-consuming, easy operation and strong applicability

Inactive Publication Date: 2021-05-07
GUOCHUANG INNOVATION CENTER OF MOBILE ENERGY (JIANGSU) CO.,LTD.
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for obtaining the optimal frequency of pulse charging, which solves the problems of high cost, heavy workload and long time consumption when using special testing equipment to obtain the optimal frequency of pulse charging, and does not require special testing equipment and is easy to operate , time-consuming and no need for repeated charge and discharge tests

Method used

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  • Method for acquiring pulse type charging optimal frequency
  • Method for acquiring pulse type charging optimal frequency
  • Method for acquiring pulse type charging optimal frequency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 is described by injecting a sine wave current signal and detecting the voltage response before charging as an example, see Figure 4 , it can be understood that the injected signal also includes but not limited to square wave, triangular wave, trapezoidal wave, etc. In addition to injecting pulse current signal, pulse voltage signal can also be injected, and the current response can be detected.

[0042] Close the contactors K1 and K2 to establish an electrical connection between the charger and the battery;

[0043] Send sine wave pulse sequence current I of different frequencies (such as 10Hz, 100Hz, 1000Hz, 10000Hz) to the secondary battery (battery to be charged) through the charger 11,12,13,..... (or pulse train voltage U 11,12,13,.... ), it should be noted that, I 11,12,13,..... As a vector, it needs to contain both amplitude and phase information and the duration of each pulse current is at least 1 complete cycle. Generally, if the battery to be c...

Embodiment 2

[0051] The second embodiment is described by taking the method of injecting random noise current signal and detecting voltage response before charging as an example. Of course, it is also possible to inject random noise voltage signal and detect current response.

[0052] Close contactors K1 and K2, see Figure 5 , to establish an electrical connection between the charger and the battery;

[0053] Send random noise current I to the secondary battery (battery to be charged) through the charger noise (or random noise voltage U noise ), it should be noted that, I noise As a vector, it needs to contain both magnitude and phase information, preferably, I noise The frequency band can cover white noise signals from 10Hz to 10000Hz.

[0054] Use the current sensor of the charger itself to detect and record the voltage response U' of the battery port when random noise current signals are injected each time noise (or current response I' noise ), U′ sise Also for vectors.

[0055...

Embodiment 3

[0066] Embodiment 3 is described by superimposing a sine wave current signal and detecting the voltage response during the charging process as an example, see Figure 6 , it can be understood that the superimposed signal also includes but not limited to square wave, triangular wave, trapezoidal wave and other pulse waves. In addition to injecting current signal, voltage signal can also be injected to detect the current response.

[0067] Close the contactors K1 and K2, establish an electrical connection between the charger and the battery, and start DC charging with a charging current of I 1 , the charging voltage is U 1 ;

[0068] By controlling the output characteristics of the charger, the charging current I 1 Superimposed on the sine wave pulse sequence current ΔI of different frequencies (such as 10Hz, 100Hz, 1000Hz, 10000Hz) 11,12,13,.... , it is worth noting that ΔI 11,12,13,.... It is a vector, that is, it contains amplitude and phase information at the same time, ...

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Abstract

The invention discloses a method for acquiring a pulse type charging optimal frequency. The method comprises the following steps: electrically connecting a charger with a secondary battery; sending a current signal or a voltage signal to the secondary battery through the charger before charging; or superimposing a current signal or a voltage signal on the charging current or voltage, wherein the current signal is one of pulse waves with different frequencies and a random noise, and the voltage signal is one of the pulse waves with different frequencies and the random noise; and the charger detects a voltage response or a current response of the secondary battery port; calculating an impedance sequence of the secondary battery according to the detected voltage response or current response; and determining that the frequency corresponding to the minimum impedance amplitude is the optimal frequency. Problems of high cost, a large workload and long consumed time when the pulse type charging optimal frequency is obtained by using special testing equipment in the prior art are solved, the special testing equipment is not needed, the operation is simple and convenient, the consumed time is short, and repeated charging and discharging testing is not needed.

Description

technical field [0001] The invention relates to the technical field of charging, in particular to a method for obtaining the optimal frequency of pulse charging. Background technique [0002] In recent years, with the rapid development of electric vehicles, electrochemical energy storage and other industries, the technology of secondary batteries (that is, rechargeable batteries) has developed rapidly. At present, secondary batteries mainly include lead-acid batteries, nickel-metal hydride batteries, lithium-ion batteries, etc. Several types, usually composed of positive electrode material, negative electrode material, electrolyte and other parts. [0003] However, the phenomenon of electrode polarization will occur during the charging process of the secondary battery (when the battery has current passing through, the phenomenon that the electrode deviates from the equilibrium electrode potential is called electrode polarization. There are three common electrode polarization...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/00711H02J7/00712
Inventor 刘博李国策冯守旺李德胜郑隽一张育铭
Owner GUOCHUANG INNOVATION CENTER OF MOBILE ENERGY (JIANGSU) CO.,LTD.
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