TESTING PROCEDURES AND DEVICE FOR CASCADED BATTERY USE

Abstract

Verification procedure for a cascade-utilized battery that exhibits: Collecting (S1) an initial initial voltage and initial voltage change data of a standard battery of the same batch as a test battery by a constant voltage difference constant current charging circuit; acquiring initial voltage difference data corresponding to the initial initial voltage according to the initial voltage change data; and acquiring an allowable cascade utilization voltage difference range corresponding to the initial initial voltage according to the initial initial voltage, the initial voltage difference data and a allowable cascade utilization deviation; and Collect (S2) a second initial voltage and second voltage change data of the test battery using a constant voltage difference constant current charging circuit; acquire second voltage difference data according to the second voltage change data; determine whether the second voltage difference data fall within the permissible cascade utilization voltage difference range if the second initial voltage is the same as the first initial voltage; and qualify the test battery if the second voltage difference data fall within the permissible cascade utilization voltage difference range; the first voltage difference data are obtained by a method which features: Collecting the first voltage change data when the standard battery is charged at a predetermined sampling interval to obtain initial voltage data; Acquiring initial first stress difference data according to the first stress data, stress evaluation data and a stress difference parameter; wherein the initial first stress difference data include stress differences in multiple sampling intervals; Combining the multiple sampling intervals as a standard sampling time and averaging the voltage differences in the multiple sampling intervals within the standard sampling time to obtain a voltage difference of the standard sampling time; and Acquiring the first voltage difference data by combining several voltage differences of the standard sampling time; and the second voltage difference data are obtained by a method which features: Collecting the second voltage change data when the test battery is charged at the specified sampling interval to obtain second voltage data; Acquisition of initial second stress difference data according to the second stress data, the stress evaluation data, and the stress difference parameter; wherein the initial second stress difference data includes stress differences at multiple sampling intervals; Combining the multiple sampling intervals as a standard sampling time and averaging the voltage differences in the multiple sampling intervals within the standard sampling time to obtain a voltage difference of the standard sampling time; and Acquiring the second voltage difference data by combining several voltage differences of the standard sampling time.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of batteries, in particular to a testing method and device for cascade use batteries. BACKGROUND

[0002] During waste battery recycling, a large number of recycled batteries are automotive batteries. When the effective capacity of automotive batteries drops below 80%, they are no longer suitable for further use as power batteries and should be removed from service. However, this type of battery has a relatively ideal residual capacity, which can be verified for reuse.

[0003] For echelon use, independent charging and discharging tests on the battery are necessary. Based on the charging and discharging characteristics, the battery's properties and performance can be determined. The battery can then be tested with qualified performance and used in other applications to achieve cascade use. Cascade use batteries must be discharged, charged, and operated over multiple cycles to assess the battery's health and residual value. However, the current preliminary verification methods have a relatively low accuracy rate, and the entire charging and discharging process must be verified to obtain an accurate result, which is time-consuming.Therefore, there is a need for a new verification method and device for a cascaded battery that can improve the accuracy of the verification and reduce the time for battery verification.

[0004] Patent literature WO 2017 / 161882 A1 discloses a method for screening a power battery that preferentially tests the DC internal resistance of a power battery under a certain state of charge (SOC) and temperature environment, thereby quickly completing the selection of the DC internal resistance and simplifying the tedious work of comprehensively testing the battery capacity.

[0005] Patent literature CN 1 13 369 287 A discloses a sorting method and system for reusing discarded battery modules. The method comprises the following steps: S1, preselecting a qualified cascade module according to a preselection rule; S2, measuring an initial voltage of each battery cell in the cascade module, discharging each battery cell to a predetermined value at a constant current and leaving it for a first predetermined time after discharging, and then measuring a voltage of each battery cell; S3, charging the cascade module to a total voltage upper limit; S4, waiting for a second predetermined time after charging, measuring an open-circuit voltage and an AC internal resistance of the cascade module, then transferring the cascade module to a storage area and measuring an open-circuit voltage of each cascade module after waiting for a third predetermined time; S5, calculating the k value of each cascade module;and S6, sorting the data in step S3 and step S5 according to the specified standard and then transmitting the cascade module to the production and assembly link for cascade use according to the sorting standard to form the finished product package.;

[0006] Patent literature CN 1 11 790 645 A relates to a sorting method for a cascade-use power battery, which tests an open-circuit voltage of the cascade-use power battery, change values ​​of the battery voltage in the charging or discharging process, and impedance values ​​of various frequency points, and on the basis thereof sets corresponding deviation ranges for the test results of various parameters, thereby realizing the rapid sorting of the cascade-use power battery.

[0007] Patent literature CN 1 11 308 380 A relates to a method and apparatus for detecting the decommissioning of a cascade battery. The method comprises the following steps: detecting a capacity value and a DC internal resistance value of the battery under test; and assessing whether the capacity value and the DC internal resistance value of the battery under test meet the continuous operation standard. If the capacity value and the DC internal resistance value of the cascade battery under test meet the continuous operation standard, the battery under test continues to operate.

[0008] Patent literature CN 1 10 515 012 A provides a method for diagnosing the health status of a storage battery, which tests the battery capacity parameters including the relaxation time and the recovery voltage difference of a plurality of new batteries and a battery under test, and judges whether the battery capacity parameters are effective parameters by using the average values ​​and standard deviations of the battery capacity parameters between the new batteries and the battery under test, and then determines the aging difference of the battery under test from the effective parameters to judge the battery capacity. OVERVIEW

[0009] The object of the present invention is to provide a novel checking method and apparatus for a cascade use battery which can improve the checking accuracy and reduce the battery checking time.

[0010] To achieve the above-mentioned object, the present invention provides a testing method for a cascade use battery, which includes: Collecting a first initial voltage and first voltage change data of a standard battery of the same batch as a test battery by a constant voltage difference constant current charging circuit; acquiring first voltage difference data corresponding to the first initial voltage according to the first voltage change data; and acquiring an allowable cascade use voltage difference range corresponding to the first initial voltage according to the first initial voltage, the first voltage difference data, and an allowable cascade use deviation; and Collecting a second initial voltage and second voltage change data of the test battery by a constant voltage difference constant current charging circuit; acquiring second voltage difference data corresponding to the second voltage change data; determining whether the second voltage difference data falls within the allowable cascade use voltage difference range when the second initial voltage is the same as the first initial voltage; and qualifying the test battery when the second voltage difference data falls within the allowable cascade use voltage difference range; wherein the first voltage difference data is obtained by a method comprising: Collecting the first voltage change data when the standard battery is charged at a predetermined sampling interval to obtain first voltage data; Acquiring initial first voltage difference data corresponding to the first voltage data, voltage evaluation data, and a voltage difference parameter; wherein the initial first voltage difference data includes voltage differences in a plurality of sampling intervals; Combining the plurality of sampling intervals as a standard sampling time and averaging the voltage differences in the plurality of sampling intervals within the standard sampling time to obtain a voltage difference of the standard sampling time; and Acquiring the first voltage difference data by combining several voltage differences of the standard sampling time; and wherein the second voltage difference data is obtained by a method comprising: collecting the second voltage change data when the test battery is charged at the predetermined sampling interval to obtain second voltage data; Acquiring initial second voltage difference data corresponding to the second voltage data, the voltage evaluation data, and the voltage difference parameter; wherein the initial second voltage difference data includes voltage differences at a plurality of sampling intervals; Combining the plurality of sampling intervals as a standard sampling time and averaging the voltage differences at the plurality of sampling intervals within the standard sampling time to obtain a standard sampling time voltage difference; and Acquire the second voltage difference data by combining multiple voltage differences of the standard sampling time.

[0011] Furthermore, the voltage difference parameter is greater than zero and less than or equal to two.

[0012] Furthermore, a constant current of the constant voltage difference constant current charging circuit does not exceed 900 mA.

[0013] The invention also discloses a testing device for a cascade-use battery, including: a constant-voltage difference constant-current charging circuit, a data acquisition and recording circuit, a data comparison unit, and a CPU control unit; wherein the CPU control unit is connected to each of the data comparison unit, the data acquisition and recording circuit, and the constant-voltage difference constant-current charging circuit; and the data acquisition and recording circuit is connected to the constant-voltage difference constant-current charging circuit. wherein the constant voltage difference constant current charging circuit is connected to a standard battery or a test battery and is configured to charge the standard battery or the test battery; the data acquisition and recording circuit is configured to collect the first initial voltage and the first voltage change data of the standard battery and the second initial voltage and the second voltage change data of the test battery fed back through the constant voltage difference constant current charging circuit, and send the first initial voltage, the second initial voltage, the first voltage change data, and the second voltage change data collected to the CPU control unit for processing and storage; the CPU control unit is configured to convert the received first voltage change data into first voltage difference data, convert the first voltage difference data into a permissible cascade use voltage difference range, convert the second voltage change data into second voltage difference data; and send the second voltage difference data and the permissible cascade use voltage difference range to the data comparison unit for comparison; and the data comparison unit is configured to compare whether the second voltage difference data falls within the allowable cascade use voltage difference range and to qualify the test battery if the second voltage difference data falls within this range; wherein the first voltage difference data is obtained by a method comprising: Collecting the first voltage change data when the standard battery is charged at a predetermined sampling interval to obtain first voltage data; Acquiring initial first voltage difference data according to the first voltage data, voltage evaluation data, and a voltage difference parameter; wherein the initial first voltage difference data includes voltage differences in a plurality of sampling intervals; Combining the plurality of sampling intervals as a standard sampling time and averaging the voltage differences in the sampling intervals within the standard sampling time to obtain a voltage difference of the standard sampling time; and Acquiring the first voltage difference data by combining several voltage differences of the standard sampling time; and wherein the second voltage difference data is obtained by a method comprising: collecting the second voltage change data when the test battery is charged at a predetermined sampling interval to obtain second voltage data; Acquiring initial second voltage difference data according to the second voltage data, voltage evaluation data, and the voltage difference parameter; wherein the initial second voltage difference data includes voltage differences at a plurality of sampling intervals; Combining the plurality of sampling intervals as a standard sampling time and averaging the voltage differences in the plurality of sampling intervals within the standard sampling time to obtain a voltage difference of the standard sampling time; and Acquire the second voltage difference data by combining multiple voltage differences of the standard sampling time.

[0014] Furthermore, the checking device further includes a signal output unit connected to the CPU control unit, and the signal output unit is used to display a check result of the battery.

[0015] Furthermore, a constant current of the constant voltage difference constant current charging circuit does not exceed 900 mA.

[0016] Compared with the prior art, the testing method and apparatus for cascade use batteries according to the example of the present invention has the following advantageous effects.

[0017] The voltage difference data of the same battery batch and the permissible cascade usage deviation are used to formulate a battery verification standard. This eliminates the determination error caused by the battery itself and achieves a more scientific verification standard for a test battery. Comparing the second voltage data with the permissible cascade usage voltage difference range can quickly and accurately determine whether a test battery meets a cascade usage standard, saving verification time. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic flow diagram of a testing method for a cascade use battery according to the present invention; Fig. 2 is a schematic structural diagram of a cascade use battery checking device of the present invention. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention will be described in more detail below in conjunction with the accompanying drawings and the embodiment. The following examples are used to illustrate the present invention, but do not limit the scope of the present invention. Example 1:

[0019] As in Fig. 1, the present invention discloses a method for testing a cascade use battery, which is applied to testing recycled waste batteries for cascade use and mainly includes the following steps: Step S1: Collecting a first initial voltage and first voltage change data of a standard battery of the same batch as a test battery by a constant voltage difference constant current charging circuit; acquiring first voltage difference data corresponding to the first initial voltage according to the first voltage change data; acquiring an allowable cascade use voltage difference range corresponding to the first initial voltage according to the first initial voltage, the first voltage difference data, and an allowable cascade use deviation. Step S2: Collecting a second initial voltage and second voltage change data of a test battery by the constant voltage difference constant current charging circuit, and acquiring second voltage difference data according to the second voltage change data; when the second initial voltage is the same as the first initial voltage, determining whether the second voltage difference data falls within the allowable cascade use voltage difference range, and qualifying the test battery when the second voltage difference data falls within the allowable cascade use range.

[0020] In this example, the recycled waste batteries are first subjected to an appearance inspection. The batteries are differentiated based on information such as manufacturer and model, and their appearance is inspected for deformation or damage. Deformed or damaged batteries are rejected. Only batteries that pass this preliminary inspection are subjected to cascade recycling.

[0021] Since batteries of different capacities and models in this example have different performance fluctuation ranges, the deviation range of the standard data is adjusted appropriately according to the different capacities, models, and batches of batteries. Generally speaking, the larger the battery capacity, the larger the deviation range. Therefore, it is necessary to determine different standard data values ​​after individual measurements on different batches of batteries. The standard data value is the allowable cascade use voltage difference range.

[0022] Therefore, in step S1, the first step is to set the standard battery corresponding to the test battery, and then obtain the standard data value measured by the standard battery. Specifically, the first initial voltage and the first voltage change data of the standard battery of the same batch as the test battery are obtained by the constant voltage difference constant current charging circuit; the first voltage change data corresponding to the first initial voltage is acquired according to the first voltage change data; according to the first initial voltage, the first voltage difference data, and the allowable cascade use voltage difference range corresponding to the first initial voltage is obtained.

[0023] In this example, the two terminals of a standard intact battery of the same batch can be connected to the constant voltage difference constant current charging circuit for charging, and the data acquisition and recording circuit collects the initial voltage and voltage change data of the battery and stores them in a memory as a standard sampling value.

[0024] In this example, to improve the accuracy of the measurement result, multiple data sets can be collected to determine an average value. In this application, the CPU control unit includes a memory. Charging through the constant voltage difference constant current charging circuit can prevent the influence of voltage and current changes on the battery charging and improve data accuracy. After charging for a certain period of time, a curve composed of the initial initial voltage and the initial voltage change data is obtained.

[0025] In this example, the first voltage difference data is obtained by a method comprising: Collecting initial voltage change data when the standard battery has been charged at a predetermined sampling interval to obtain initial voltage data; Acquiring initial first voltage difference data according to the first voltage data, voltage evaluation data, and a voltage difference parameter; wherein the initial first voltage difference data includes voltage differences in a plurality of sampling intervals; Taking the plurality of sampling intervals as a standard sampling time and averaging the voltage differences in the plurality of sampling intervals within the standard sampling time to obtain a voltage difference of the standard sampling time; Acquire the first voltage difference data consisting of several voltage differences of the standard sampling time.

[0026] In this example, the sampling interval is typically set to 0.2 seconds, the default sampling time is 1 second, and the voltage difference at each standard sampling time is collected and recorded. Professionals can adjust the sampling interval and standard sampling time as needed, such as an interval of 0.25 seconds or an interval of 0.1 seconds.

[0027] In this example, the initial first voltage difference data was obtained according to the first voltage data, the voltage evaluation data and the voltage difference parameter, specifically by a method comprising: Calculate the voltage difference according to the following formula: Voltage difference = (nominal battery voltage - actual battery voltage) × voltage difference parameter. The value range of the voltage difference parameter is greater than zero and less than or equal to 2. Typically, the voltage difference is 0.1 to 2 V. The voltage in each sampling interval can be obtained according to the initial voltage data, and the voltage in these sampling intervals constitutes the initial voltage data. The actual battery voltage is the voltage in the sampling interval. The above process is repeated for each sampling interval to obtain the initial voltage difference data.

[0028] Since the initial voltage difference data still contains a certain error, it must be corrected. The allowable cascade use voltage difference range corresponding to the initial initial voltage is determined based on the initial initial voltage, the initial voltage difference data, and the allowable cascade use deviation. The initial voltage difference data is corrected by the allowable cascade use deviation to obtain the allowable cascade use voltage difference range corresponding to the initial initial voltage.

[0029] The obtained permissible cascade usage voltage difference range is saved for subsequent comparison.

[0030] In this example, several standard batteries are usually measured to select a certain ratio of the batteries with the most stable performance for re-measurement and then average their data as standard data.

[0031] Once the charging data of the battery from the same batch as the test battery has been recorded, the recording of the charging data of the test battery can be started.

[0032] In step S2, the second initial voltage and the second voltage change data of the test battery are collected by the constant voltage difference constant current charging circuit, and the second voltage difference data is determined according to the second voltage change data. If the second initial voltage is equal to the first initial voltage, it is determined whether the second voltage difference data falls within the allowable cascade use voltage difference range. If the second voltage difference data falls within the allowable cascade use voltage difference range, the test battery is qualified.

[0033] In this example, the method for obtaining the second voltage difference data is the same as the method for obtaining the first voltage difference data, and the acquisition of the second voltage difference data can be understood by referring to the description of the first voltage difference data in this application.

[0034] In this example, the second voltage difference data is obtained by a method comprising: Collecting second voltage change data when the test battery is charged at a predetermined sampling interval to obtain second voltage data; Acquiring initial second voltage difference data according to the second voltage data, voltage evaluation data, and a voltage difference parameter; wherein the initial second voltage difference data includes voltage differences obtained in a plurality of sampling intervals; Taking the plurality of sampling intervals as a standard sampling time and averaging the voltage differences in the plurality of sampling intervals within the standard sampling time to obtain a voltage difference of the standard sampling time; Acquire the second voltage difference data consisting of multiple voltage differences of the standard sampling time.

[0035] In this example, the standard sampling time for the second voltage difference data does not exceed 10 minutes. By using the verification method of this application, a high-precision verification result can be obtained by acquiring data for 10 minutes, which can effectively reduce the verification time and improve the verification efficiency.

[0036] In this example, to improve the accuracy of the battery test, only when the second output voltage and the first output voltage are equal is it determined whether the voltage difference data falls within the allowable cascade use voltage difference range. Those skilled in the art can collect data according to the standard battery data collection method disclosed in this application through a limited number of experiments to obtain a database. The database must contain data matching the second initial voltage. If no matching data can be found, it means that the initial voltage of the test battery has experienced a large deviation and the battery does not meet a cascade use condition.

[0037] If the second voltage difference data falls within the allowable cascade usage range, it is determined that the battery under test is qualified. If the second voltage difference data does not fall within the cascade usage range, it is determined that the battery under test is not qualified.

[0038] In this example, the value of the voltage difference parameter is greater than zero and less than or equal to two.

[0039] In this example, the constant voltage difference constant current charging circuit is state-of-the-art. An optional embodiment of the constant voltage difference charging circuit performs voltage and current control for a Texas Instruments LM3420-4.2 chip charging circuit. The constant current of the constant voltage difference constant current charging circuit does not exceed 900 mA. If the constant current of the constant voltage difference constant current charging circuit does not exceed a certain range, the measurement error of the circuit is reduced. Example 2:

[0040] Based on Example 1, the present invention discloses with reference to Fig.2 also relates to a cascade-use battery testing device used for testing recycled waste batteries for cascade use, comprising: a constant voltage difference constant current charging circuit, a data acquisition and recording circuit, a data comparison unit, and a CPU control unit; the CPU control unit is connected to the data comparison unit, the data acquisition and recording circuit, and the constant voltage difference constant current charging circuit, respectively; the data acquisition and recording circuit is connected to the constant voltage difference constant current charging circuit.

[0041] The constant voltage difference constant current charging circuit is connected to a standard battery or a test battery and is used to charge the standard battery or the test battery.

[0042] The data acquisition and recording circuit is used to collect the first initial voltage and first voltage change data of the standard battery, as well as the second initial voltage and second voltage change data of the test battery, which are fed back through the constant voltage difference constant current charging circuit. The collected first initial voltage, second initial voltage, first voltage change data, and second voltage change data are sent to the CPU control unit for processing and storage.

[0043] The CPU control unit is used to convert the received first voltage change data into first voltage difference data, convert the first voltage difference data into a permissible cascade use voltage difference range, and convert the second voltage change data into a second voltage difference range. The second voltage difference data and the permissible cascade use voltage difference range are sent to the data comparison unit for comparison.

[0044] The data comparison unit is used to compare and determine whether the second voltage difference data falls within the allowable cascade use voltage difference range. The test battery is qualified if the second voltage difference data falls within the allowable cascade use voltage difference range.

[0045] The testing device of the present application applies the testing method of Example 1 to test batteries. The first initial voltage and the first voltage change data of the standard battery of the same batch as the test battery are collected by the constant voltage difference constant current charging circuit; the first voltage difference data corresponding to the first initial voltage is acquired according to the first voltage change data; according to the first initial voltage, the first voltage difference data, and the allowable cascade use deviation, the allowable cascade use voltage difference range corresponding to the first initial voltage is obtained; and the second initial voltage and the second voltage change data of the test battery are obtained by the constant voltage difference constant current charging circuit, and the second voltage difference data is obtained according to the second voltage change data.If the second initial voltage and the first initial voltage are equal, it is determined whether the second voltage difference data falls within the allowable cascade use voltage difference range. If the second voltage difference data falls within the allowable cascade use range, it is determined that the test battery is qualified.

[0046] In this example, the first voltage difference data is specifically obtained by a method comprising: Collecting the first voltage change data when the standard battery is charged at a predetermined sampling interval to obtain the first voltage data; Acquiring the initial first voltage difference data corresponding to the first voltage data, the voltage evaluation data, and the voltage difference parameter; the initial first voltage difference data includes voltage differences in a plurality of sampling intervals; Taking the plurality of sampling intervals as a standard sampling time and averaging the voltage difference in the plurality of sampling intervals within the standard sampling time to obtain the voltage difference of the standard sampling time; Acquire the first voltage difference data consisting of several voltage differences of the standard sampling time.

[0047] In this example, the second voltage difference data is specifically obtained by a method comprising: Collecting second voltage change data when the test battery is charged at a predetermined sampling interval to obtain second voltage data; Acquiring initial second voltage difference data according to the second voltage data, the voltage evaluation data, and a voltage difference parameter; the initial second voltage difference data includes voltage differences obtained at a plurality of sampling intervals; Taking the different sampling intervals as a standard sampling time and averaging the voltage differences in the different sampling intervals within the standard sampling time to obtain a voltage difference of the standard sampling time; Acquire the second voltage difference data consisting of multiple voltage differences of the standard sampling time.

[0048] In this example, the time required to collect the second voltage difference data is no more than ten minutes. By using the verification method of this application, a high-precision verification result can be obtained by collecting data for ten minutes, which can effectively reduce the verification time and improve the verification efficiency.

[0049] In this example, the checking device further includes a signal output unit connected to the CPU control unit, and the signal output unit is used to display the checking result of the battery.

[0050] In this example, the constant current of the constant voltage difference constant current charging circuit does not exceed 900 mA. If the constant current does not exceed a certain range, the measurement error of the circuit is smaller.

[0051] Since the inspection device of Example 2 applies the inspection method of Example 1, those skilled in the art know that the technical features of Example 1 can be directly applied to Example 2. Those skilled in the art can understand the first voltage difference data and the second voltage difference data in Example 2 based on the description of Example 1.

[0052] In summary, the testing method and device for cascade-use batteries in the example of the present invention has the following advantageous effect compared to the prior art: The voltage difference data of batteries of the same batch and the allowable cascade-use deviation are used to formulate a battery testing standard, which can largely eliminate the detection error caused by the battery itself and obtain a more scientific testing standard for the test battery. The comparison between the second voltage data and the allowable cascade-use voltage difference range can quickly and accurately determine whether the test battery meets a cascade-use standard, saving testing time.

[0053] The above are only the preferred embodiments of the present invention. It should be emphasized that various improvements and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention. These improvements and substitutions should also be considered to fall within the scope of the present invention.

Claims

[1] Verification procedure for a cascade use battery, which comprises: Collecting (S1) a first initial voltage and first voltage change data of a standard battery of the same batch as a test battery by a constant voltage difference constant current charging circuit; acquiring first voltage difference data corresponding to the first initial voltage according to the first voltage change data; and acquiring an allowable cascade use voltage difference range corresponding to the first initial voltage according to the first initial voltage, the first voltage difference data, and an allowable cascade use deviation; and Collecting (S2) a second initial voltage and second voltage change data of the test battery by a constant voltage difference constant current charging circuit; acquiring second voltage difference data according to the second voltage change data; determining whether the second voltage difference data falls within the allowable cascade use voltage difference range when the second initial voltage is the same as the first initial voltage; and qualifying the test battery when the second voltage difference data falls within the allowable cascade use voltage difference range; wherein the first voltage difference data is obtained by a method comprising: Collecting the first voltage change data when the standard battery is charged at a predetermined sampling interval to obtain first voltage data; Acquiring initial first voltage difference data according to the first voltage data, voltage evaluation data, and a voltage difference parameter; wherein the initial first voltage difference data includes voltage differences in a plurality of sampling intervals; Combining the plurality of sampling intervals as a standard sampling time and averaging the voltage differences in the plurality of sampling intervals within the standard sampling time to obtain a voltage difference of the standard sampling time; and Acquiring the first voltage difference data by combining multiple voltage differences of the standard sampling time; and wherein the second voltage difference data is obtained by a method comprising: collecting the second voltage change data when the test battery is charged at the predetermined sampling interval to obtain second voltage data; Acquiring initial second voltage difference data according to the second voltage data, the voltage evaluation data, and the voltage difference parameter; wherein the initial second voltage difference data includes voltage differences at a plurality of sampling intervals; Combining the plurality of sampling intervals as a standard sampling time and averaging the voltage differences in the plurality of sampling intervals within the standard sampling time to obtain a voltage difference of the standard sampling time; and Acquire the second voltage difference data by combining multiple voltage differences of the standard sampling time. [2] The cascade use battery verification method according to claim 1, wherein the voltage difference parameter is greater than 0 and less than or equal to 2. [3] The testing method for the cascade use battery according to claim 1, wherein a constant current of the constant voltage difference constant current charging circuit does not exceed 900 mA. [4] A cascade-use battery testing device comprising a constant-voltage difference constant-current charging circuit, a data acquisition and recording circuit, a data comparison unit, and a CPU control unit; wherein the CPU control unit is connected to each of the data comparison unit, the data acquisition and recording circuit, and the constant-voltage difference constant-current charging circuit; and the data acquisition and recording circuit is connected to the constant-voltage difference constant-current charging circuit; the constant voltage difference constant current charging circuit is connected to a standard battery or a test battery and is designed to charge the standard battery or the test battery; the data acquisition and recording circuit is configured to collect a first initial voltage and first voltage change data of the standard battery and a second initial voltage and second voltage change data of the test battery fed back through the constant voltage difference constant current charging circuit, and send the first initial voltage, the second initial voltage, the first voltage change data, and the second voltage change data collected to the CPU control unit for processing and storage; the CPU control unit is configured to convert the received first voltage change data into first voltage difference data, convert the first voltage difference data into a permissible cascade use voltage difference range, convert the second voltage change data into second voltage difference data; and send the second voltage difference data and the permissible cascade use voltage difference range to the data comparison unit for comparison; and the data comparison unit is configured to compare whether the second voltage difference data falls within the allowable cascade use voltage difference range and to qualify the test battery if the second voltage difference data falls within this range; wherein the first voltage difference data is obtained by a method comprising: Collecting the first voltage change data when the standard battery is charged at a predetermined sampling interval to obtain first voltage data; Acquiring initial first voltage difference data according to the first voltage data, voltage evaluation data, and a voltage difference parameter; wherein the initial first voltage difference data includes voltage differences in a plurality of sampling intervals; Combining the plurality of sampling intervals as a standard sampling time and averaging the voltage differences in the plurality of sampling intervals within the standard sampling time to obtain a voltage difference of the standard sampling time; and Acquiring the first voltage difference data by combining several voltage differences of the standard sampling time; and wherein the second voltage difference data is obtained by a method comprising: collecting the second voltage change data when the test battery is charged at a predetermined sampling interval to obtain second voltage data; Acquiring initial second voltage difference data according to the second voltage data, voltage evaluation data, and the voltage difference parameter; wherein the initial second voltage difference data includes voltage differences at a plurality of sampling intervals; Combining the plurality of sampling intervals as a standard sampling time and averaging the voltage differences in the plurality of sampling intervals within the standard sampling time to obtain a voltage difference of the standard sampling time; and Acquire the second voltage difference data by combining multiple voltage differences of the standard sampling time. [5] The cascade use battery checking device according to claim 4, further comprising a signal output unit connected to the CPU control unit, and the signal output unit is configured to display a check result of the battery. [6] A cascade battery device according to any one of claims 4 to 5, wherein a constant current of the constant voltage difference constant current charging circuit does not exceed 900 mA.

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