TW201506419A - Method and apparatus for detecting electrical characteristics of a lithium battery - Google Patents

Abstract

A method and an associated apparatus for detecting electrical characteristics of a lithium battery are disclosed. The method includes steps of: attaching two ultrasound probes to two sides of a lithium battery respectively; sending a non-destructive detection ultrasonic signal to the lithium battery via the two ultrasound probes, and sensing a resonant pressure wave signal from the lithium battery via the two ultrasound probes, wherein the detection ultrasonic signal penetrates through and reflects in the lithium battery; and generating an electrical characteristics analysis result of the lithium battery by comparing the resonant pressure wave signal with a reference resonant pressure wave signal.

Description

Lithium battery electrical detection method and device

The invention relates to a method and a device for detecting a lithium battery, in particular to a method and a device for detecting electrical properties of a lithium battery.

Lithium batteries have high energy density, stable discharge characteristics, fast charging, long cycle life, and extremely low self-discharge, so they are used in many fields, from tiny watch batteries to car batteries. The positive and negative materials, electrolytes, separator materials, can bodies, and assembly quality of lithium batteries all affect the electrical properties of lithium batteries.

However, the conventional method of detecting a lithium battery requires continuous charging and discharging of the lithium battery, and detects electrical characteristics such as capacitance capacity, charging efficiency, power storage rate, self-discharge voltage, or self-discharge rate. Each time charging and discharging takes a long time, which leads to inconvenience in detection. Moreover, because the number of times of charging the lithium battery is also limited, the conventional detection method will lower the service life of the lithium battery.

Accordingly, an object of the present invention is to provide an electrical detection method and apparatus for a lithium battery, which can perform non-destructive rapid detection of a lithium battery to solve the conventional problems.

The technical means for solving the problems of the prior art provides a method for electrically detecting a lithium battery, comprising the steps of: respectively attaching two ultrasonic probes to two sides of a lithium battery; using two ultrasonic probes Passing a non-destructive detection of the ultrasonic signal to the lithium battery and sensing it by two ultrasonic probes A resonance pressure wave signal from the lithium battery detects the ultrasonic signal through the reflection and reflection in the lithium battery; and compares the resonance pressure wave signal with a reference resonance pressure wave signal to generate an electrical analysis result, wherein The reference resonant pressure wave signal is a resonant pressure wave signal from a reference lithium battery.

In an embodiment of the invention, the electrical analysis result is generated by comparing the similarity between the resonant pressure wave signal and the waveform data of the reference resonant pressure wave signal.

In an embodiment of the invention, the electrical analysis result includes a capacitance capacity, a charging efficiency, a power storage rate, a self-discharge voltage, a self-discharge rate, and/or an internal structural defect.

Another technical means for solving the problems of the prior art is to provide an electrical detecting device for a lithium battery for detecting electrical characteristics of a lithium battery. The electrical detecting device comprises two ultrasonic probes and a signal is emitted. A control device, a signal receiving and integrating device, and an analyzing device. Two ultrasonic probes are attached to the two sides of the lithium battery, wherein each ultrasonic probe emits an ultrasonic signal and receives an ultrasonic signal. The signal issuing control device controls the two ultrasonic probes to transmit a non-destructive detection ultrasonic signal to the lithium battery. The signal receiving and integrating device receives the integration and obtains a resonance pressure wave signal from the lithium battery by the two ultrasonic probes. The analyzing device is electrically connected to the signal receiving and integrating device to analyze the resonant pressure wave signal sensed by the ultrasonic probe to obtain an electrical analysis result.

In an embodiment of the invention, the coupling between the ultrasonic probe and the lithium battery is provided with a coupling member, and the coupling member has a coupling medium.

In an embodiment of the invention, the coupling member is a coupling cloth.

In an embodiment of the invention, the coupling medium is anhydrous alcohol.

In an embodiment of the invention, a transport mechanism is further included for transporting the lithium battery to a detection position of the corresponding ultrasonic probe.

In an embodiment of the invention, the electrical analysis result includes a capacitance capacity, a charging efficiency, a storage rate, a self-discharge voltage, a self-discharge rate, And / or an internal structural defect.

By using the technical means adopted by the present invention, the non-destructive ultrasonic detection method is used to detect the lithium battery, and it is possible to quickly detect various electrical characteristics of the lithium battery without taking time to charge and discharge the lithium battery, thereby screening for problems. The lithium battery can immediately know the problem and make the corresponding repair, so the organic lithium battery can be reused without being scrapped, which saves cost and achieves environmental protection.

The specific embodiments of the present invention will be further described by the following examples and the accompanying drawings.

100, 100a‧‧‧Electrical testing equipment for lithium batteries

1a, 1b‧‧‧ ultrasonic probe

2‧‧‧ Signal issuing control device

3‧‧‧Signal receiving integrated device

4‧‧‧Analytical device

5‧‧‧Coupling medium replenishing device

51‧‧‧Coupling members

6‧‧‧Transportation agency

B‧‧‧Lithium battery

1 is a flow chart showing an electrical detection method of a lithium battery according to a first embodiment of the present invention; and FIG. 2 is a schematic view showing an electrical detection device for a lithium battery according to a first embodiment of the present invention; A schematic cross-sectional view of a lithium battery according to a first embodiment of the present invention; and Fig. 4 is a schematic view showing an electrical detecting device for a lithium battery according to a second embodiment of the present invention.

Referring to FIG. 1 , an electrical detection method for a lithium battery of the present invention is used for detecting electrical characteristics of a lithium battery, and the method includes the following steps: attaching two ultrasonic probes to two sides of a lithium battery respectively (step S10) Using two ultrasonic probes to deliver a non-destructive detection of ultrasonic signals to the lithium battery, and two ultrasonic probes sense a resonant pressure wave signal from the lithium battery to detect the penetration of the ultrasonic signal. Reflecting in the lithium battery (step S20); and comparing the resonant pressure wave signal with a reference resonant pressure wave signal to generate an electrical analysis result, wherein the reference resonant pressure wave signal is sensing from a reference lithium battery Resonance pressure wave signal (step S30).

In the present embodiment, the electrical detection device 100 of the lithium battery is used to implement the electrical detection method of the lithium battery of the present invention. As shown in FIG. 2, the lithium battery electrical detecting device 100 includes two ultrasonic probes 1a, 1b, a signal issuing control device 2, a signal receiving and integrating device 3, and an analyzing device 4. The two ultrasonic probes 1a, 1b are attached to the two sides of the lithium battery B, wherein each of the ultrasonic probes 1a, 1b emits an ultrasonic signal and receives an ultrasonic signal. The signal issuing control device 2 controls the two ultrasonic probes 1a, 1b to transmit a non-destructive detecting ultrasonic signal to the lithium battery B. The signal receiving and integrating device 3 receives the integration and obtains a resonance pressure wave signal from the lithium battery B by the two ultrasonic probes 1a, 1b. The analyzing device 4 is electrically connected to the signal receiving and integrating device 3 to analyze the resonance pressure wave signals sensed by the ultrasonic probes 1a and 1b to obtain an electrical analysis result.

First, the two ultrasonic probes 1a, 1b are attached to both sides of a reference lithium battery, and the resonant pressure wave signal of the reference lithium battery is sensed by a non-destructive ultrasonic detection method (step S01), referring to the lithium battery The resonance pressure wave signal is the reference resonance pressure wave signal. Wherein, the electrical characteristics of the reference lithium battery are measured by other electrical measurement methods, and a lithium battery having a good electrical property and the same type as the lithium battery to be tested is selected as a reference lithium battery for use as a reference The reference standard when comparing. When another type of lithium battery needs to be measured, another type of lithium battery having good electrical characteristics is used as a reference lithium battery, and then the resonance pressure wave is sensed by the two ultrasonic probes of the present invention as a reference. Resonant pressure wave.

Next, the two ultrasonic probes 1a, 1b are attached to a lithium battery B to be tested (step S10), and a coupling member 51 is placed between the ultrasonic probes 1a, 1b and the lithium battery B for As a medium for conducting ultrasonic waves, it overcomes the problem of poor transmission of ultrasonic waves in the air. The coupling member 51 has a coupling medium. In the embodiment, the coupling member 51 is a coupling cloth, and the coupling medium is an anhydrous alcohol, and a coupling medium is replenished to the coupling member 51 through a coupling medium replenishing device 5 to ensure The ultrasonic transmission is the same for each measurement.

Then, the signal issuing control device 2 controls the two ultrasonic probes 1a, 1b transmits a non-destructive detection ultrasonic signal to the lithium battery B, and receives the ultrasonic wave received by the two ultrasonic probes 1a, 1b through the signal receiving and integrating device 3, and is sensed by the two ultrasonic probes 1a, 1b. The resonance pressure wave signal from the lithium battery B (step S20).

In detail, as shown in FIG. 3, the ultrasonic signal is detected in the lithium battery B after repeated reflection, refraction, and penetration, and is transmitted through various parts of the lithium battery B, such as electrolyte (electrolyte), The quality of these parts determines the electrical properties of the lithium battery B by the shell, the separation film, and the electrode. The respective parts generate different signals for detecting the ultrasonic waves, and the corresponding resonance pressure wave signals are transmitted back to the two ultrasonic probes 1a and 1b. The electrical characteristics of the lithium battery B are determined by comparing these resonance pressure wave signals with the reference resonance pressure wave signals of the reference battery.

Next, the analyzing device 4 compares the resonance pressure wave signal with the reference resonance pressure wave signal to generate an electrical analysis result (step S30). The electrical analysis result is generated by comparing the similarity between the resonant pressure wave signal and the waveform data of the reference resonant pressure wave signal. Specifically, the comparison compares the electrical analysis results corresponding to the resonance pressure wave signal based on the electrical characteristics corresponding to the frequency band, the wave front intensity, and the width of the wave packet in the waveform data. The electrical analysis results include electrical characteristics such as a capacitance capacity, a charging efficiency, a power storage rate, a self-discharge voltage, a self-discharge rate, and/or an internal structural defect. For example, when the concentration of the electrolyte of a lithium battery to be tested is different from that of the reference lithium battery, the resonance pressure waves of the two lithium batteries are different, so that the comparison is performed after the comparison device 4 performs the comparison. The lithium battery is abnormal in the concentration of the electrolyte, and the corresponding electrical characteristics are analyzed. In this way, the non-destructive ultrasonic detection method can quickly detect various electrical characteristics of the lithium battery B without taking time to charge and discharge the lithium battery B. In addition, after testing and screening the problematic lithium battery, you can immediately know where the problem is and make the corresponding repair, instead of scrapping these problematic lithium batteries and reusing them, saving cost and achieving environmental protection.

Referring to FIG. 4, the electrical detecting apparatus 100a of the lithium battery of the second embodiment of the present invention further includes a transport mechanism 6. The conveying mechanism 6 is configured to transport the lithium battery B to be tested to a detection position of the corresponding ultrasonic probes 1a, 1b, and transport the measured lithium battery B to other places. After the detection, the conveying mechanism 6 transports the measured lithium battery B to other positions, and delivers the next lithium battery B to be tested to the detection position, thereby providing automated detection, and each lithium battery is present. The production line is shipped after automated electrical property testing and screening, ensuring that the lithium batteries delivered to consumers are good, thereby increasing consumer satisfaction.

The above description is only for the preferred embodiment of the present invention, and those skilled in the art can make other improvements according to the above description, but these changes still belong to the inventive spirit of the present invention and the patents defined below. In the scope.

Claims (9)

A method for electrically detecting a lithium battery, comprising the steps of: (a) attaching two ultrasonic probes to two sides of a lithium battery; and (b) transmitting the non-destructive power to the lithium battery by using the two ultrasonic probes; Detecting an ultrasonic signal, and sensing, by the two ultrasonic probes, a resonance pressure wave signal from the lithium battery, the detection ultrasonic signal being penetrated and reflected in the lithium battery; and (c) The resonant pressure wave signal is compared with a reference resonant pressure wave signal to generate an electrical analysis result, wherein the reference resonant pressure wave signal is a resonant pressure wave signal from a reference lithium battery. The method for detecting electrical conductivity of a lithium battery according to claim 1, wherein in the step (c), the electrical analysis result is based on a similarity between the resonant pressure wave signal and the waveform data of the reference resonant pressure wave signal. Produced by the right. The method for detecting electrical conductivity of a lithium battery according to claim 1, wherein in the step (c), the electrical analysis result includes a capacitance capacity, a charging efficiency, a storage rate, a self-discharge voltage, and a self-discharge rate. And/or an internal structural defect. An electrical detecting device for a lithium battery for detecting electrical characteristics of a lithium battery, the electrical detecting device comprising: two ultrasonic probes for attaching to two sides of the lithium battery, wherein the ultrasonic probes are issued a supersonic signal and receiving an ultrasonic signal; a signal issuing control device controls the two ultrasonic probes to transmit a non-destructive detection ultrasonic signal to the lithium battery; a signal receiving integrated device receives the integration and is obtained by The two ultrasonic probes sense a resonant pressure wave signal from the lithium battery; and an analyzing device electrically connected to the signal receiving and integrating device to analyze the resonant pressure wave signal sensed by the ultrasonic probe to obtain an electrical property Analysis results. The electrical detection device for a lithium battery according to claim 4, wherein a coupling member is disposed between the ultrasonic probe and the lithium battery, the coupling member has a coupling medium. The electrical detection device for a lithium battery according to claim 5, wherein the coupling member is a coupling cloth. The electrical detection device for a lithium battery according to claim 5, wherein the coupling medium is anhydrous alcohol. The electrical detection device for a lithium battery according to claim 4, further comprising a conveying mechanism for conveying the lithium battery to a detection position corresponding to one of the ultrasonic probes. The electrical detection device for a lithium battery according to claim 4, wherein the electrical analysis result comprises a capacitance capacity, a charging efficiency, a storage rate, a self-discharge voltage, a self-discharge rate, and/or an internal structure. defect.