Battery current flow inspection system and method

Abstract

The present invention operates in correspondence with the output of the user's input unit, manages the registration, correction, deletion, and display of set values, measured values, and diagnostic values ​​of different battery inspection items, matches and stores the set values ​​of different inspection items with corresponding battery types, and sequentially changes the phase difference between the input frequency input to the above-mentioned waste battery and the output frequency for each input frequency to find the high-frequency resonance frequency. After calculating the AC impedance corresponding to the found high-frequency resonance frequency, the calculated AC impedance is compared with the current flow upper limit. If the calculated AC impedance is lower than the current flow upper limit, it is diagnosed as normal. If the calculated AC impedance is higher than the current flow upper limit, it is judged as abnormal.

Description

Technical Field

[0001] The present invention relates to a technology for checking the current flow of waste batteries (used batteries), and relates to a battery current flow checking system and method as follows: before the waste batteries are used again or recycled, the charging state of the waste batteries and whether they can be charged are confirmed, and whether there is abnormal current flow is confirmed by resistance inspection. Background Art

[0002] The Notice on Specific Compliance Matters for Waste Recyclers, formulated in accordance with Article 13, Paragraph 23 of the Waste Management Act of South Korea, Article 13, Paragraph 23 of the Implementing Rules of the Waste Management Act, and Appendix 5 No. 43 of the Implementing Rules of the Waste Management Act, states that "persons who recycle waste batteries from electric vehicles must conduct an appearance inspection and an electrical flow inspection of the waste batteries before recycling."

[0003] According to the announcement, the current flow inspection of waste batteries needs to confirm the current charging status and whether it can be charged by connecting the charging device, and confirm whether the current flow is abnormal through resistance inspection.

[0004] However, there has been no system or device provided so far for checking the flow of electricity in a spent battery by connecting a charging device. Summary of the invention

[0005] The object to be achieved by the present invention is to provide a battery current flow inspection system and method capable of performing current flow inspection on waste batteries.

[0006] The object to be achieved by the present invention is to provide a battery current flow inspection system and method capable of inspecting the current flow rate of waste batteries of electric vehicles at a low cost.

[0007] The embodiments of the present invention can be used to achieve other purposes not specifically mentioned except for the above-mentioned purposes.

[0008] The battery current flow inspection system of the embodiment of the present invention for solving the above-mentioned problems comprises: an inspection item management unit, which operates in accordance with the output of the user input unit and manages the registration, correction, deletion and display of set values, measured values ​​and diagnostic values ​​for different battery inspection items; a set value storage unit, which matches and stores the set values ​​of each inspection item registered by the inspection item management unit with the corresponding battery type; an AC impedance meter, which changes the input frequency and sequentially inputs it into the waste battery and outputs the output frequency for each input frequency; an impedance grasping unit, which operates the AC impedance meter according to the instruction of the inspection item management unit, grasps the phase difference between the input frequency input into the waste battery and the output frequency corresponding to the corresponding input frequency to find the high-frequency resonance frequency, and calculates the AC impedance corresponding to the high-frequency resonance frequency; and an impedance diagnosis unit, which compares the AC impedance calculated in the impedance grasping unit with the current flow upper limit, and diagnoses it as normal if the calculated AC impedance is lower than the current flow upper limit, and judges it as abnormal if the calculated AC impedance is higher than the current flow upper limit.

[0009] The battery current flow inspection system of the embodiment of the present invention may also include: a battery voltage grasping unit, which operates an electrically connected battery voltage measuring instrument according to the instructions of the above-mentioned inspection item management unit, and grasps the voltage of the above-mentioned waste battery through the above-mentioned battery voltage measuring instrument; a voltage diagnosis unit, which compares the battery voltage grasped in the above-mentioned battery voltage grasping unit with a set voltage range, and if the grasped battery voltage is within the above-mentioned set voltage range, it is diagnosed as normal, otherwise it is diagnosed as abnormal; an insulation resistance grasping unit, which operates an electrically connected insulation resistance measuring instrument according to the instructions of the above-mentioned inspection item management unit, and grasps the insulation resistance of the above-mentioned waste battery through the above-mentioned insulation resistance measuring instrument; an insulation resistance diagnosis unit, which compares the insulation resistance grasped in the above-mentioned insulation resistance grasping unit with a set insulation resistance lower limit, and if the grasped insulation resistance is lower than the above-mentioned set insulation resistance lower limit, it is judged to be abnormal, and if the grasped insulation resistance is higher than the above-mentioned set insulation resistance lower limit, it is judged to be normal; and a suitability diagnosis unit, which receives each diagnosis result outputted from the above-mentioned voltage diagnosis unit, the above-mentioned insulation resistance diagnosis unit and the above-mentioned current flow diagnosis unit to judge the final suitability.

[0010] The inspection item management unit provides a project setting screen to the user through a display device, and the project setting screen includes: an area for the user to input or display the battery type, the set voltage range according to the battery type, the lower limit of the insulation resistance, and the upper limit of the current flow; an area for displaying the battery voltage, insulation resistance, and AC impedance grasped in each of the grasping units; an area for displaying the charging state, flowability, and insulation safety according to the diagnosis results of each diagnosis unit; and an area for displaying the final suitability diagnosed in the suitability diagnosis unit.

[0011] The battery current flow inspection method of the embodiment of the present invention for solving the above-mentioned problem comprises: the step of setting the type of waste battery to be inspected and the setting values ​​of different inspection items; the step of inputting a first input frequency into the waste battery according to the request of the user to grasp the first output frequency for the first input frequency by operating the AC impedance measuring instrument; the step of grasping the first phase difference between the first input frequency and the first output frequency; the step of finding the resonance frequency by grasping whether the first phase difference is "0"; the step of changing the frequency to input a second input frequency into the waste battery to grasp the second output frequency for the second input frequency; the step of sequentially changing the frequency until the set frequency is input into the waste battery, and finding the resonance frequency by grasping the phase difference between the input frequency input into the waste battery and the output frequency corresponding to the corresponding input frequency and registering it; the step of judging the highest frequency in the registered resonance frequency as the high-frequency resonance frequency; the step of calculating the AC impedance using the voltage and current at the high-frequency resonance frequency; and the step of comparing the calculated AC impedance with the current flow upper limit of the set value, and diagnosing it as normal if the calculated AC impedance is lower than the current flow upper limit, and judging it as abnormal if the calculated AC impedance is higher than the current flow upper limit.

[0012] According to an embodiment of the present invention, the current flow rate of a used battery of an electric vehicle may be checked according to the Korean Ministry of Environment's announcement order.

[0013] The object of the present invention is to provide a system and method for checking the current flow rate of a used battery of an electric vehicle using alternating current at a low cost.

[0014] The embodiments of the present invention can be used to achieve other purposes not specifically mentioned in addition to the above-mentioned purposes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 4 is a block diagram of a battery current flow inspection system according to an embodiment of the present invention.

[0016] Figure 2 4 is a three-dimensional diagram of a battery current flow inspection system according to an embodiment of the present invention.

[0017] Figure 3 This is a diagram showing in detail the impedance measurement structure in the battery current flow inspection system according to the embodiment of the present invention.

[0018] Figure 4 and Figure 5 FIG. 1 is a diagram for explaining an impedance measurement operation in the battery current flow inspection system according to an embodiment of the present invention.

[0019] Figure 6 and Figure 7It is a diagram showing a screen displaying inspection items and inspection results in the battery current flow inspection system according to the embodiment of the present invention.

[0020] Figure 8 The flowchart is a method for checking the battery current flow according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] Hereinafter, several embodiments are described clearly and in detail with reference to the accompanying drawings so that a person skilled in the art (hereinafter referred to as a skilled person) can easily implement the present invention. In addition, the term "unit" used in the specification may refer to a hardware structural element or a circuit.

[0022] Hereinafter, a battery current flow inspection system and method according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0023] Before the description is given, it should be pointed out that the batteries referred to below refer to waste batteries used in electric vehicles, and the batteries to be inspected are one of battery cells, battery modules or battery packs.

[0024] Figure 1 FIG. 1 is a block diagram of a battery current flow inspection system according to an embodiment of the present invention. Figure 1 The battery current flow inspection system 100 of the embodiment of the present invention includes an inspection item management unit 110, a set value storage unit 120, a battery voltage control unit 130, an insulation resistance control unit 140, an impedance control unit 150, a voltage diagnosis unit 160, an insulation resistance diagnosis unit 170, a current flow diagnosis unit 180, a suitability diagnosis unit 190 and an AC impedance meter 230.

[0025] In the case where the AC impedance meter 230 is manufactured to be detachable from the system 100 of the present invention, the system 100 of the embodiment of the present invention may omit the AC impedance meter 230 .

[0026] On the other hand, in the battery current flow inspection system of the embodiment of the present invention, when only the AC impedance meter 230 is used, the battery voltage grasping unit 130, the insulation resistance grasping unit 140, the voltage diagnosis unit 160 and the insulation resistance diagnosis unit 170 can be omitted.

[0027] The inspection item management unit 110 manages the set values, measured values, diagnostic values, and final inspection values ​​of different battery inspection items. The set values ​​refer to the reference values ​​of different inspection items for comparison with the measured values, and the measured values ​​refer to the values ​​measured by different inspection items, for example, the measured battery voltage, the measured battery insulation resistance, and the measured battery impedance. Moreover, the diagnostic value indicates normality (pass) or abnormality (fail) by comparing the reference values ​​of different inspection items with the measured values. Moreover, the final inspection value is a value that shows the final battery suitability according to the diagnostic value, for example, indicating suitability or unsuitability.

[0028] Furthermore, the inspection item management unit 110 performs the following management: registering the set values ​​as the reference values ​​of each inspection item according to the type of battery, and correcting or deleting the set values, etc., according to the user's request input through the user input unit 10. The inspection item management unit 110 generates an item setting screen for external display through the display device 20, and the user inputs and registers a new battery type and the set values ​​related to the new battery type through the item setting screen, and confirms the set values ​​of different inspection items of the battery to be inspected, various diagnostic values, and final inspection values ​​through the item setting screen.

[0029] Among them, refer to Figure 6 and Figure 7 Describes the project setting screen. Figure 6 and Figure 7 It is a diagram showing a screen displaying inspection items and inspection results in the battery current flow inspection system according to the embodiment of the present invention.

[0030] Reference Figure 6 and Figure 7 , the following areas and buttons are displayed on the left side of the project setting screen: Area ①, for the user to enter the battery ID (identification information) or call and display the registered battery ID; Area ②, for the user to enter the battery type or call and display the registered battery type; Button ③, can call a new project setting screen to record new battery information; Button ④, can delete the currently displayed battery information; Area ⑤, for the user to enter the setting value of the inspection item or call and display the corresponding registered setting value; and Button ⑥, indicating the start of the inspection. When the user clicks Button ⑥ indicating the start of the inspection, the screen changes and displays "Inspection Initialization".

[0031] Moreover, area ⑤ includes: an area displayed as "voltage range" indicating the upper and lower limits of the battery voltage in the corresponding battery type; an area displayed as "capacity" indicating the current current value; an area displayed as "current flow upper limit" indicating the upper limit of the AC impedance; and an area displayed as "insulation resistance lower limit" indicating the lower limit of the insulation resistance.

[0032] In addition, on the right side of the item setting screen, there is an area for displaying the measured values ​​and measurement results of the inspection items.

[0033] For example, refer to Figure 6 and Figure 7 , the right side of the project setting screen has the following areas: Area ⑦, which displays the inspection progress; Area ⑧, which displays "Charging State", indicating the measured battery voltage and remaining capacity (SOC); Area ⑨, which displays "Electrical Flow", indicating the measured AC impedance; Area ⑩, which displays "Insulation Stability", indicating the measured insulation resistance; Area ⑪, which displays the diagnosis results based on the measured values; and Area ⑫, which finally displays the current flow inspection results.

[0034] The above remaining capacity can be calculated using the battery voltage, or can be grasped by generating a remaining capacity list using the maximum voltage and the minimum voltage of the battery.

[0035] exist Figure 6 In the test results on the right side of the item setting screen, the measured battery voltage is 27.72V, which is within the set voltage range of 24.20V to 29.40V, and is displayed as normal (pass). The AC impedance, that is, the flow rate, is 15.62Ω, which is below the set value of 20.00Ω, and is displayed as normal. The measured insulation resistance exceeds the set value of 1.00MΩ, and is displayed as normal. Therefore, the final inspection result shows that all inspection items are normal, so it is displayed as "suitable / capable of charging".

[0036] On the contrary, Figure 7 In the test, observe the measurement results on the right side of the item setting screen. The measured battery voltage is 27.71V, which exceeds the set voltage range of 288.00V to 403.20V, and is displayed as abnormal (FAIL). The AC impedance, that is, the flow rate, is 15.62Ω, which is below the set value of 416.65Ω, and is displayed as normal (pass). The measured insulation resistance exceeds the set value of 1.00MΩ, and is displayed as normal (pass). The final inspection result shows that one of the inspection items is abnormal, so it is displayed as "Not suitable / Cannot be charged".

[0037] Then, the setting value storage unit 120 matches and stores the setting values ​​of each inspection item registered by the inspection item management unit 110 with the corresponding battery type. Of course, the setting value storage unit 120 can also store the inspection results of the waste batteries that have completed the inspection.

[0038] The battery current flow inspection system 100 of the embodiment of the present invention has a measurement value grasping unit A, which grasps the measurement values ​​of different inspection items. Each grasping unit of the measurement value grasping unit A operates according to the instruction of the inspection item management unit 110, and provides the grasped measurement values ​​to the inspection item management unit 110. The measurement value grasping unit A includes a battery voltage grasping unit 130, an insulation resistance grasping unit 140, and an impedance grasping unit 150.

[0039] The battery voltage grasping unit 130 receives the measurement result from the battery voltage measuring instrument 210 by controlling the operation of the battery voltage measuring instrument 210, thereby grasping the battery voltage (for example, the voltage of a battery cell, a battery module, or a battery pack). The battery voltage measuring instrument 210 is a device that measures the battery voltage by connecting one measuring terminal to the cathode of the battery and the other measuring terminal to the anode of the battery, and is a common battery voltage measuring device.

[0040] The insulation resistance grasping unit 140 receives and grasps the insulation resistance of the battery measured by the insulation resistance measuring instrument 220 by controlling the operation of the battery voltage measuring instrument 210. The insulation resistance measuring instrument 220 is a common device for measuring the insulation resistance of the battery, for example, a device that measures the insulation resistance of the battery by connecting one terminal to the anode or cathode terminal of the battery and the other terminal to the battery body.

[0041] The impedance grasping unit 150 receives the frequencies of the multiple currents provided from the AC impedance measuring instrument 230 and the frequencies of the voltages measured corresponding to the frequencies of the provided currents by controlling the operation of the AC impedance measuring instrument 230, grasps the phase difference between the frequencies of the currents and voltages with the same frequency, and then grasps the AC impedance using the voltage and current with a frequency without a phase difference. The AC impedance using the voltage and current with a frequency without a phase difference shows the same value as the DC impedance of the DC power supply.

[0042] The battery current flow inspection system 100 of the embodiment of the present invention has a measurement value diagnosis unit B, which diagnoses whether the measurement values ​​of different inspection items are normal or abnormal. Each diagnosis unit of the measurement value diagnosis unit B provides the diagnosis result to the inspection item management unit 110. The measurement value diagnosis unit B includes a voltage diagnosis unit 160, an insulation resistance diagnosis unit 170, and a current flow diagnosis unit 180.

[0043] The voltage diagnosis unit 160 compares the voltage detected by the battery voltage detection unit 130 with the set voltage, that is, with the set voltage range, to diagnose whether the detected voltage is within the set voltage range. If the detected voltage is within the set voltage range, the voltage diagnosis unit 160 diagnoses it as normal, otherwise, it diagnoses it as abnormal.

[0044] The insulation resistance diagnosis unit 170 compares the insulation resistance grasped by the insulation resistance grasping unit 140 with a set insulation resistance, and diagnoses that the insulation resistance is normal if the grasped insulation resistance is higher than the set insulation resistance, and diagnoses that the insulation resistance is abnormal if the insulation resistance is higher than the set insulation resistance.

[0045] The current flow diagnosis unit 180 compares the AC impedance grasped by the impedance grasping unit 150 with the set impedance, and diagnoses that the AC impedance is normal if it is lower than the set insulation resistance, and diagnoses that the AC impedance is abnormal if it is lower.

[0046] The suitability diagnostic unit 190 receives the diagnostic results output from the voltage diagnostic unit 160 , the insulation resistance diagnostic unit 170 , and the current flow diagnostic unit 180 , determines final suitability, and provides the test item management unit 110 with the suitability result.

[0047] The AC impedance measuring device 230 generates frequencies in a set frequency band in order from the minimum frequency to the maximum frequency or from the maximum frequency to the minimum frequency and inputs them to the waste battery 30 , and provides the impedance grasping unit 150 with an output frequency corresponding to the input frequency.

[0048] As an example, the battery current flow inspection system 100 of the embodiment of the present invention composed of the above structure is Figure 2 Manufactured in the manner shown. Figure 2 3D diagram of a battery current flow inspection system according to an embodiment of the present invention. Figure 2 The display device 20 is composed of a common display, and a connection component such as a socket or a plug that is electrically connected to the terminals of each measuring instrument 210, 220, and 230 is provided in the battery current flow inspection system 100. Of course, when the AC impedance measuring instrument 230 is included as a part of the structure, the battery current flow inspection system 100 can be integrated with the AC impedance measuring instrument 230.

[0049] Below, refer to Figures 3 to 5 , the impedance grasping unit 150 and the AC impedance measuring instrument 230 in the electric current inspection system according to the embodiment of the present invention are described. Figure 3 FIG. 1 is a diagram showing in detail the impedance measurement structure in the battery current flow inspection system according to an embodiment of the present invention. Figure 4 and Figure 5 It is a diagram for explaining the impedance measurement principle in the battery current flow inspection system according to the embodiment of the present invention.

[0050] The current flow test is used to check the flow of AC current, and the flow of AC current is affected by AC impedance. However, the battery is an electrochemical device that uses DC current, and as a measure of its suitability for the flow of current, the resistance to DC current shows the most similar DC resistance value when there is no phase difference between the current and the voltage when the AC current is measured.

[0051] Specifically, as we all know, the impedance Z in direct current is calculated by "Z = resistance R", and in alternating current, the impedance Z is calculated by "Z = R (resistance) + jX (impedance)". That is, unlike in direct current, in alternating current, the flow of alternating current is affected by impedance X, and reactance X has inductive reactance X. L and capacitive reactance X C .

[0052] Inductive reactance X L With capacitive reactance X C It can be expressed by the following mathematical formula 1 and mathematical formula 2.

[0053] Mathematical formula 1:

[0054] Mathematical formula 2:

[0055] In the above equations 1 and 2, f is frequency, L is inductance, and C is capacitance.

[0056] From the mathematical formula 1 and the mathematical formula 2, we can see that the inductive reactance X L and capacitive reactance X C Affected by frequency. That is, the inductive reactance X L and capacitive reactance X C As a factor that affects the frequency of current and voltage, it causes a phase difference between the frequency of voltage and current, affecting the period and rate of change of the frequency of voltage and current. L and capacitive reactance X C Moves in opposite directions according to frequency.

[0057] The phase difference φ between the frequency of the current and the frequency of the voltage can be expressed by the following Math. 3.

[0058] Mathematical formula 3:

[0059] Therefore, in the inductive reactance X L and capacitive reactance X C At the time point when the impedance is the same, the phase difference between the current frequency and the voltage frequency is "0", so the AC impedance and the DC impedance become the same. In a circuit, the frequency when the phase difference between the current frequency and the voltage frequency is "0" is called the resonant frequency.

[0060] Therefore, the present invention searches for the resonance frequency when measuring the current flow, and uses the AC impedance at the resonance frequency as the measured AC impedance.

[0061] According to the above-mentioned current flow measurement principle of the present invention, the impedance grasping unit 150 and the AC impedance measuring instrument 230 are used to Figure 3 Constructed in the manner shown. Figure 3 This is a diagram showing in detail the impedance measurement structure in the battery current flow inspection system according to the embodiment of the present invention.

[0062] Reference Figure 3 The impedance grasping unit 150 includes a measurement control unit 151 , a phase difference grasping unit 152 , and an impedance calculating unit 153 , and the AC impedance measuring instrument 230 includes a frequency adjusting unit 231 , an input frequency generating unit 232 , and an output frequency measuring unit 233 .

[0063] The measurement control unit 151 operates the AC impedance measuring instrument 230 according to the instruction of the inspection item management unit 110, and the phase difference grasping unit 152 grasps the phase difference between the two frequencies by receiving the input frequency input to the waste battery 30 and the output frequency output from the waste battery 30. The input frequency is the frequency of the current, and the output frequency is the frequency of the voltage.

[0064] The impedance calculation unit 153 grasps the time point when the phase difference value continuously received from the phase difference grasping unit 152 is "0", and uses the amplitude of the input frequency and the output frequency at the time point when the phase difference value is "0", that is, uses the current value and the voltage value to calculate the AC impedance Z. In this case, since the phase difference value is "0", the AC impedance Z only needs to calculate the resistance R.

[0065] Reference Figure 4 and Figure 5 The operations of the phase difference grasping unit 152 and the impedance calculating unit 153 will be described. Figure 4 and Figure 5 FIG. 2 is a diagram for explaining an impedance measurement operation in a battery current flow inspection system according to an embodiment of the present invention. Figure 4 is a Bode plot showing the phase difference and impedance change according to the frequency change, Figure 5 is the Nyquist plot of the real and imaginary parts.

[0066] Reference Figure 4 In the Bode plot shown in part (a) of FIG. 1 , when the frequency is changed from 0.1 by the AC impedance meter 230, the phase difference φ between the current and the voltage grasped by the impedance calculation unit 153 changes from a negative value to a positive value as shown in the g1 curve. In the above change, at least one resonant frequency with a phase difference of "0" is found, and the impedance calculation unit 153 searches for the highest frequency among the at least one resonant frequency, that is, searches for a high-frequency resonant frequency.

[0067] Moreover, if Figure 4 As shown in part (b) of FIG. 1 , the impedance calculation unit 153 calculates Figure 4The impedance at the high-frequency resonance frequency found in part (a) is used as the AC impedance as the resistance value.

[0068] pass Figure 5 The Nyquist plot is used to illustrate Figure 4 , when the frequency is changed from 0.1, the AC impedance of the waste battery 30 is represented by an interval in which the value of the vertical axis as the imaginary part is "0" and there are only values ​​of the horizontal axis as the real part, and is represented by an interval in which the values ​​of the imaginary part and the real part appear at the same time. In this case, the interval in which the value of the vertical axis as the imaginary part is "0" and there are only values ​​of the horizontal axis as the real part is an interval in which the phase difference between the voltage and the current is "0", and in this interval, the impedance of the real part at the edge position is the AC impedance calculated in the impedance calculation unit 153.

[0069] The following describes a method for inspecting battery current according to an embodiment of the present invention. Figure 8 The flowchart is a method for checking the battery current flow according to an embodiment of the present invention.

[0070] Reference Figure 8 In order to check the battery current flow, the user electrically connects the battery voltage meter 210 and the insulation resistance meter 220 to the system 100, and connects the inspection terminals of the battery voltage meter 210, the insulation resistance meter 220 and the AC impedance meter 230 to the waste battery 30.

[0071] In this state, when the user requests to check the battery current flow through the user input unit 10 , the inspection item management unit 110 displays an item setting screen as a setting window through the display device 20 (step S801 ).

[0072] Next, if the user selects or inputs the inspection object information of the battery to be inspected in the project setting screen by using the personnel input unit 10, the inspection item management unit 110 receives the inspection object information, such as the type of battery or the battery identification (step S802), calls the setting values ​​of different inspection items of the received inspection object from the setting value storage unit 120 and displays them on the project setting screen (step S803).

[0073] Then, when the user clicks the button ⑥ for starting inspection in the item setting screen, the inspection item management unit 110 notifies each of the grasping units 130 , 140 , and 150 to start the inspection (step S804 ).

[0074] Next, the battery voltage grasping unit 130 operates the battery voltage measuring device 210 to measure the voltage of the scrap battery 30 , grasps the battery voltage based on the measurement result, and provides the grasped battery voltage to the voltage diagnosing unit 160 (step S805 ).

[0075] The voltage diagnosis unit 160 calculates the state of charge (SOC) of the waste battery from the received battery voltage, provides the battery voltage and the calculated battery SOC information to the inspection item management unit 110 , and displays each information on the item setting screen (step S806 ).

[0076] Then, the voltage diagnosis unit 160 diagnoses whether the received battery voltage is within the set voltage range and whether the battery state of charge is appropriate, and provides the diagnosis result to the inspection item management unit 110 , and displays the diagnosis result related to the battery voltage on the item setting screen (step S807 ).

[0077] The insulation resistance grasping unit 140 operates the insulation resistance measuring instrument 220 to measure the insulation resistance of the waste battery 30, grasps the insulation resistance of the battery through the measurement result and provides it to the insulation resistance diagnosing unit 170 (step S808). The insulation resistance diagnosing unit 170 diagnoses whether the received insulation resistance exceeds the set insulation resistance lower limit and provides the diagnosis result to the inspection item management unit 110, and displays the insulation resistance on the item setting screen, that is, displays the diagnosis result related to the insulation stability (step S809).

[0078] The impedance grasping unit 150 operates the AC impedance measuring instrument 230 (step S810), and then the AC impedance measuring instrument 230 changes the frequency in a manner of increasing the input frequency from 0.1 Hz to a set frequency (step S811), and provides the input frequency input to the battery 30 and the corresponding output frequency to the impedance grasping unit 150, and the phase difference between the input frequency and the output frequency is grasped in the impedance grasping unit 150 (step S812).

[0079] Furthermore, the impedance grasping unit 150 searches for the resonance frequency of the high frequency with a phase difference of "0" (step S813), grasps the AC impedance using the voltage value and current value of the resonance frequency of the high frequency found, and provides the grasped AC impedance to the current flow diagnosis unit 180 and the inspection item management unit 110 (step S814). Next, the current flow diagnosis unit 180 compares the grasped AC impedance with the set current flow upper limit, and if the AC impedance is lower than the current flow upper limit, it is diagnosed as normal, and if the AC impedance is higher than the current flow upper limit, it is diagnosed as abnormal, and the diagnosis result is provided to the inspection item management unit 110 and displayed on the item setting screen (step S815).

[0080] The suitability diagnosing unit 190 receives the diagnosis results of the diagnosing units 160 , 170 , and 180 , integrates the diagnosis results, diagnoses suitability or unsuitability, provides the diagnosis results to the examination item management unit 110 , and displays them on the item setting screen (step S816 ).

[0081] The above description is intended to provide exemplary structures and operations for embodying the present invention. The technical concept of the present invention includes not only the embodiments described above, but also specific embodiments that can be obtained by simply changing or modifying the above embodiments. In addition, the technical concept of the present invention also includes specific embodiments that can be obtained by easily changing or modifying the above embodiments.

Claims

1. A battery current flow inspection system for inspecting the current flow of waste batteries, characterized in that: include: The inspection item management unit operates in accordance with the output of the user input unit to manage the registration, correction, deletion, and display of set values, measured values, and diagnostic values ​​for different battery inspection items; A setting value storage unit, which matches and stores the setting values ​​of various inspection items registered by the inspection item management unit with corresponding battery types; An AC impedance measuring instrument, which changes the input frequency and sequentially inputs it into the waste batteries, and outputs each output frequency for the sequentially input input frequency; The impedance grasping unit operates the AC impedance measuring instrument according to the instruction of the inspection item management unit, grasps the phase difference between the input frequency input to the waste battery and the output frequency corresponding to the corresponding input frequency to find the highest frequency among the at least one resonant frequency, and calculates the AC impedance corresponding to the highest resonant frequency found; as well as The current flow diagnosis unit compares the AC impedance calculated in the impedance grasping unit with the current flow upper limit, and diagnoses it as normal if the calculated AC impedance is lower than the current flow upper limit, and judges it as abnormal if the calculated AC impedance is higher than the current flow upper limit. The impedance control unit includes: The measurement control department operates the AC impedance meter according to the instructions of the inspection project management department; a phase difference grasping unit that grasps a phase difference between the two frequencies by receiving the input frequency as a frequency of current input to the waste battery and the output frequency as a frequency of voltage output from the waste battery; and an impedance calculation unit that grasps a time point when the phase difference value continuously received from the phase difference grasping unit becomes "0", and calculates the AC impedance using the current value amplitude of the input frequency and the voltage value amplitude of the output frequency at the time point when the phase difference value becomes "0", The impedance calculation unit detects the highest resonance frequency among the at least one resonance frequency at a time point when the phase difference is "0", and calculates the impedance corresponding to the detected highest resonance frequency. The above-mentioned upper limit of current flow is the upper limit of AC impedance.

2. The battery current flow inspection system according to claim 1, characterized in that: Also includes: A battery voltage grasping unit, operating the electrically connected battery voltage measuring instrument according to the instruction of the inspection item management unit, and grasping the voltage of the waste battery through the battery voltage measuring instrument; a voltage diagnosis unit, which compares the battery voltage grasped by the battery voltage grasping unit with a set voltage range, and diagnoses the battery voltage as normal if the grasped battery voltage is within the set voltage range, otherwise it is diagnosed as abnormal; The insulation resistance grasping unit operates the electrically connected insulation resistance measuring instrument according to the instruction of the inspection project management unit, and grasps the insulation resistance of the waste battery through the insulation resistance measuring instrument; an insulation resistance diagnosis unit that compares the insulation resistance grasped by the insulation resistance grasping unit with a set insulation resistance lower limit, and judges that the insulation resistance is abnormal if the insulation resistance grasped is lower than the set insulation resistance lower limit, and judges that the insulation resistance is normal if the insulation resistance grasped is higher than the set insulation resistance lower limit; and The suitability diagnosis unit receives the diagnosis results outputted from the voltage diagnosis unit, the insulation resistance diagnosis unit, and the current flow diagnosis unit, and determines whether or not the final suitability is achieved.

3. The battery current flow inspection system according to claim 2, characterized in that: The inspection item management unit provides the user with an item setting screen via a display device. The above project setting screen includes: An area capable of allowing a user to input or display a battery type, the set voltage range according to the battery type, the insulation resistance lower limit, and the current flow upper limit; An area for displaying the battery voltage, insulation resistance, and AC impedance grasped by each of the grasping units; An area showing the charging state, electric flowability and insulation safety according to the diagnosis results of each diagnosis unit; and This is an area that displays the final suitability or failure determined by the suitability diagnosing unit.

4. A battery current flow inspection method, characterized in that: include: Steps for setting the type of waste batteries to be inspected and the set values ​​of different inspection items; The step of operating an AC impedance meter to input a first input frequency into the waste battery according to a user's request to obtain a first output frequency corresponding to the first input frequency; A step of grasping a first phase difference between the first input frequency and the first output frequency; A step of finding the resonance frequency by determining whether the first phase difference is "0"; The step of changing the frequency to input a second input frequency to the waste battery to obtain a second output frequency for the second input frequency; The steps of sequentially changing the frequency until a set frequency is reached and inputting the set frequency into the waste battery, and finding and registering the highest frequency among at least one resonant frequency by grasping the time point when the phase difference between the input frequency sequentially changed and input into the waste battery and the output frequency corresponding to the input frequency reaches "0"; The step of determining the highest frequency among the registered resonance frequencies as the highest-frequency resonance frequency; The step of calculating AC impedance using the voltage and current at the highest resonant frequency; as well as The step of comparing the calculated AC impedance with the current upper limit of the set value, and diagnosing that if the calculated AC impedance is lower than the current upper limit, it is normal; if the calculated AC impedance is higher than the current upper limit, it is abnormal. In the step of finding the highest frequency and registering it, The phase difference grasping unit determines that the resonance frequency of the highest frequency at a time point when the value of the phase difference is "0" is the highest frequency resonance frequency, In the step of calculating the AC impedance using the voltage and current at the highest resonant frequency, The impedance calculation unit calculates the impedance corresponding to the determined highest resonance frequency. The above input frequency is the frequency of the current, and the above output frequency is the frequency of the voltage. The above-mentioned upper limit of current flow is the upper limit of AC impedance.

5. The battery current flow inspection method according to claim 4, characterized in that: Also includes: Steps of obtaining the voltage of the above waste battery by connecting a battery voltage measuring instrument; Comparing the voltage of the waste battery with a set voltage range, if the voltage of the waste battery is within the set voltage range, diagnosing it as normal, otherwise diagnosing it as abnormal; Steps of measuring the insulation resistance of the waste battery by connecting an insulation resistance tester; The step of comparing the insulation resistance of the waste battery obtained in the above step with a set insulation resistance lower limit, and if the insulation resistance obtained is lower than the set insulation resistance lower limit, determining that it is abnormal, and if the insulation resistance obtained is higher than the set insulation resistance lower limit, diagnosing that it is normal; and The step of receiving the diagnosis result of the voltage of the waste battery and the diagnosis result of the insulation resistance of the waste battery to determine the final suitability.

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