A photovoltaic energy storage battery aging test system and test method

Abstract

The present invention discloses a photovoltaic energy storage battery aging test system and test method, relates to the field of photovoltaic energy storage batteries, solves the problem of inaccurate aging test methods of current photovoltaic energy storage batteries, comprises a test preparation module, a comprehensive test module and a test evaluation module, the test preparation module is used to complete the preparatory work of the photovoltaic energy storage battery aging test, the photovoltaic energy storage battery marked as a test sample is transported to the comprehensive test module, and the test preparation module also analyzes and obtains the test level of the photovoltaic energy storage battery, and sets corresponding test conditions according to the test level; after completing the preparatory work of the photovoltaic energy storage battery test, the comprehensive test module performs an aging test on the photovoltaic energy storage battery marked as a test sample, and the test evaluation module is used to evaluate the anti-aging performance of the photovoltaic energy storage battery. The present invention realizes intelligent aging test of the photovoltaic energy storage battery in combination with the preliminary analysis result.

Description

Technical Field

[0001] The present invention belongs to the field of photovoltaic energy storage batteries and relates to aging test technology, in particular to an aging test system and a test method for photovoltaic energy storage batteries. Background Art

[0002] Photovoltaic energy storage batteries, as an important part of renewable energy systems, play a key role in energy storage and balancing supply and demand. As time goes by and the conditions of use change, energy storage batteries will experience performance degradation and life attenuation. In actual applications, the performance parameters of the battery are monitored to evaluate its life and reliability. Aging tests usually involve charge and discharge tests, temperature tests, capacity tests, and internal resistance tests. By recording the battery's charge and discharge capacity, charge and discharge efficiency, voltage changes, temperature changes, and evaluating capacity loss and internal resistance changes;

[0003] Under the current technical background, photovoltaic energy storage batteries are widely used in various application scenarios, which also makes the working environment and use environment of photovoltaic energy storage batteries complex and changeable. Since photovoltaic energy storage batteries do not have the ability to change their own performance, long-term operation in an unsuitable environment will cause the performance of photovoltaic energy storage batteries to lose rapidly. In addition, the current aging test for photovoltaic energy storage batteries is a unified standard, and there is no pre-analysis of photovoltaic energy storage batteries before the aging test, resulting in inaccurate aging tests for photovoltaic energy storage batteries;

[0004] To this end, we propose a photovoltaic energy storage battery aging test system and test method. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention aims to provide a photovoltaic energy storage battery aging test system and test method.

[0006] The technical problems to be solved by the present invention are:

[0007] How to implement intelligent aging testing of photovoltaic energy storage batteries based on pre-analysis results.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A photovoltaic energy storage battery aging test system, characterized in that it includes a data acquisition module, a test preparation module, a comprehensive test module, a test evaluation module and a server;

[0010] The data acquisition module is used to acquire standard performance data and standard specification data of the photovoltaic energy storage battery, and send the standard performance data and standard specification data to the server, and the server sends the standard performance data of the photovoltaic energy storage battery to the test preparation module;

[0011] The test preparation module is used to complete the preparatory work for the aging test of the photovoltaic energy storage battery. The photovoltaic energy storage battery marked as a test sample is transferred to the comprehensive test module. At the same time, the test preparation module also sends the test level of the photovoltaic energy storage battery obtained by analysis to the server. The server sets the test conditions corresponding to the photovoltaic energy storage battery according to the test level and sends them to the comprehensive test module;

[0012] After completing the preparatory work for the photovoltaic energy storage battery test, the comprehensive test module performs an aging test on the photovoltaic energy storage battery marked as a test sample, and sends the high temperature impact index, low temperature impact index and over-specification charge and discharge impact index of the photovoltaic energy storage battery obtained by the test to the server, and the server sends the high temperature impact index, low temperature impact index and over-specification charge and discharge impact index of the photovoltaic energy storage battery to the test evaluation module;

[0013] The test and evaluation module is used to evaluate the anti-aging performance of the photovoltaic energy storage battery and determine whether the anti-aging performance of the photovoltaic energy storage battery is qualified or unqualified.

[0014] Further, the standard performance data includes the operating temperature range, standard charging rate, standard discharge rate and standard number of cycles of the photovoltaic energy storage battery;

[0015] The standard specification data includes the rated capacity, rated saturation voltage, standard internal resistance of the photovoltaic energy storage battery, and the sample length, sample width and sample height of the photovoltaic energy storage battery.

[0016] Furthermore, the working process of the test preparation module is as follows:

[0017] Obtain the measured length SCi, measured width SKi and measured height SHi of the photovoltaic energy storage battery, where i is the serial number of the photovoltaic energy storage battery, i is a non-zero natural number, and the upper limit value of i is n;

[0018] Obtain the sample length YC, sample width YK and sample height YH of the photovoltaic energy storage battery, and calculate the length error CCi of the photovoltaic energy storage battery according to the formula. The specific formula is as follows:

[0019] CCi=|SCi-YC|;

[0020] Similarly, the width error KCi and height error HCi of the photovoltaic energy storage battery are calculated according to the formula. The specific formula is as follows:

[0021] KCi=|SKi-YK|;

[0022] HCi=|SHi-YH|;

[0023] Compare the length error, width error and height error of the photovoltaic energy storage battery with the error critical value one by one;

[0024] If the value of any one of the length error, width error or height error of the photovoltaic energy storage battery is greater than or equal to the error critical value, the corresponding photovoltaic energy storage battery will be marked as a non-test sample.

[0025] Furthermore, the working process of the test preparation module also includes:

[0026] If the values ​​of the length error, width error and height error of the photovoltaic energy storage battery are all less than the error critical value, the standard charging rate BC, standard discharging rate BF, rated saturation voltage EV and standard internal resistance BR of the photovoltaic energy storage battery are obtained;

[0027] Connect the photovoltaic energy storage battery to a charging device that complies with safety regulations, charge the photovoltaic energy storage battery and measure the actual charging rate SCi of the photovoltaic energy storage battery;

[0028] When the photovoltaic energy storage battery stops charging and the voltage is stable, the measured voltage value is recorded as the measured saturation voltage SVi of the photovoltaic energy storage battery, and the measured resistance value is recorded as the measured internal resistance SRi of the photovoltaic energy storage battery;

[0029] Connect the photovoltaic energy storage battery to the electrical equipment that complies with safety regulations, supply power to the electrical equipment from the photovoltaic energy storage battery and measure the actual discharge rate SFi of the photovoltaic energy storage battery;

[0030] The parameter compliance coefficient DBi of the photovoltaic energy storage battery is calculated according to the formula. The specific formula is as follows:

[0031] DBi=1 / |SCi-BC|+1 / |SFi-BF|+1 / |SVi-EV|+1 / |SRi-BR|;

[0032] Compare the parameter compliance coefficient of the photovoltaic energy storage battery with the parameter compliance range;

[0033] If the parameter compliance coefficient of the photovoltaic energy storage battery belongs to the first parameter compliance interval, the corresponding photovoltaic energy storage battery will be marked as a non-test sample;

[0034] If the parameter compliance coefficient of the photovoltaic energy storage battery belongs to the second parameter compliance interval, the corresponding photovoltaic energy storage battery will be marked as a test sample;

[0035] Among them, the values ​​of the parameter standard interval are all greater than zero, and the values ​​of the first parameter standard interval are all smaller than the values ​​of the second parameter standard interval.

[0036] Furthermore, the working process of the test preparation module also includes:

[0037] The operating temperature range T∈(t1, t2), standard cycle number BX, and rated capacity ER of the photovoltaic energy storage battery marked as a test sample are obtained, and the test intensity value QD of the photovoltaic energy storage battery is calculated according to the formula. The specific formula is as follows:

[0038] QD=(t2-t1)×q1+BX×ER×q2;

[0039] Among them, q1 and q2 are proportional coefficients with fixed values, the values ​​of q1 and q2 are both greater than zero, q1 is the temperature suitability coefficient, and q2 is the charge and discharge capacity coefficient;

[0040] The test intensity value of the photovoltaic energy storage battery is compared with the test intensity threshold to determine whether the test level of the photovoltaic energy storage battery is the first test level, the second test level or the third test level.

[0041] Further, the test intensity corresponding to the first test level is lower than the test intensity corresponding to the second test level;

[0042] The test intensity corresponding to the second test level is lower than the test intensity corresponding to the third test level.

[0043] Furthermore, the corresponding relationship between the test conditions and the test levels is as follows:

[0044] If the test level is the first test level, the corresponding test conditions are the first temperature additional coefficient and the first rate additional coefficient;

[0045] If the test level is the second test level, the corresponding test conditions are the second temperature additional coefficient and the second rate additional coefficient;

[0046] If the test level is the third test level, the corresponding test conditions are the third temperature additional coefficient and the third rate additional coefficient;

[0047] Among them, the first temperature additional coefficient is smaller than the second temperature additional coefficient, the second temperature additional coefficient is smaller than the third temperature additional coefficient, the first rate additional coefficient is smaller than the second rate additional coefficient, and the second rate additional coefficient is smaller than the third rate additional coefficient.

[0048] Furthermore, the testing process of the comprehensive testing module is as follows:

[0049] Dividing the photovoltaic energy storage battery into a control test group, a first test group, a second test group and a third test group;

[0050] The test parameter settings for the control test group are as follows:

[0051] Test temperature = (t1 + t2) / 2; Test charge rate = standard charge rate; Test discharge rate = standard discharge rate;

[0052] The test parameters for the first test group are set to;

[0053] Test temperature = t2 + (t2 - t1) × W; test charge rate = standard charge rate; test discharge rate = standard discharge rate;

[0054] The test parameters for the second test group are set to;

[0055] Test temperature = t1-(t2-t1)×W; Test charge rate = standard charge rate; Test discharge rate = standard discharge rate;

[0056] The test parameters of the third test group are set as;

[0057] Test temperature = (t1 + t2) / 2; Test charge rate = standard charge rate × V; Test discharge rate = standard discharge rate × V;

[0058] Wherein, W is the temperature additional coefficient, V is the rate additional coefficient, and it can be understood that the first test group is used for high temperature environment testing, the second test group is used for low temperature environment testing, and the third test group is used for super-standard charge and discharge rate testing;

[0059] The photovoltaic energy storage batteries in the control test group, the first test group, the second test group and the third test group are subjected to cyclic charge and discharge tests of the same number of cycles, and the performance test data of the photovoltaic energy storage batteries are monitored. The performance test data include the test charging rate SLur, the test battery temperature WDur, the test endurance time XHur and the test battery capacity RLur of the photovoltaic energy storage batteries in each test group during each test. u is the test group number, and the value of u includes 0, 1, 2, and 3. 0 corresponds to the control test group, 1 corresponds to the first test group, 2 corresponds to the second test group, and 3 corresponds to the third test group. r is the test sequence number, and the upper limit of r is R. The value of R is equal to the total number of cycles of the cyclic charge and discharge test of the photovoltaic energy storage battery. Among them, the test charging rate is the minimum charging rate of the photovoltaic energy storage battery corresponding to each test group during the test, and the test battery temperature is the highest battery temperature of the photovoltaic energy storage battery corresponding to each test group during the test.

[0060] The performance test data of the photovoltaic energy storage batteries in the control test group and the first test group are obtained, and the high temperature impact index GW of the photovoltaic energy storage batteries is calculated according to the formula. The specific formula is as follows:

[0061] ;

[0062] In the above formula, SL0r is the test charging rate of the photovoltaic energy storage battery in the control test group, WD0r is the test battery temperature of the photovoltaic energy storage battery in the control test group, XH0r is the test battery life of the photovoltaic energy storage battery in the control test group, RL0r is the test battery capacity of the photovoltaic energy storage battery in the control test group, SL1r is the test charging rate of the photovoltaic energy storage battery in the first test group, WD1r is the test battery temperature of the photovoltaic energy storage battery in the first test group, XH1r is the test battery life of the photovoltaic energy storage battery in the first test group, and RL1r is the test battery capacity of the photovoltaic energy storage battery in the first test group;

[0063] Similarly, the performance test data of the photovoltaic energy storage batteries in the control test group and the second test group are obtained, and the low temperature impact index DW of the photovoltaic energy storage batteries is calculated according to the formula; the specific formula is as follows:

[0064] ;

[0065] The performance test data of the photovoltaic energy storage batteries in the control test group and the third test group are obtained, and the over-specification charge and discharge impact index CF of the photovoltaic energy storage batteries is calculated according to the formula; the specific formula is as follows:

[0066] ;

[0067] Furthermore, the evaluation process of the test evaluation module is as follows:

[0068] Obtain the high temperature impact index GW, low temperature impact index DW and over-specification charge and discharge impact index CF of the photovoltaic energy storage battery, and calculate the anti-aging value KL of the photovoltaic energy storage battery according to the formula. The specific formula is as follows:

[0069] KL=e / [(GW+DW)×k1+CF×k2];

[0070] Among them, k1 is the temperature influence coefficient, k2 is the charge and discharge influence coefficient, and e is the natural constant;

[0071] Compare the anti-aging value of photovoltaic energy storage batteries with the anti-aging threshold;

[0072] If the anti-aging value is greater than the anti-aging threshold, the anti-aging performance of the photovoltaic energy storage battery is determined to be qualified;

[0073] If the anti-aging value is less than or equal to the anti-aging threshold, the anti-aging performance of the photovoltaic energy storage battery is judged to be unqualified.

[0074] The present invention also proposes a method for testing aging of photovoltaic energy storage batteries, the method comprising the following steps:

[0075] Step S101, obtaining standard performance data and standard specification data of photovoltaic energy storage batteries;

[0076] Step S102, preparatory work for aging test of photovoltaic energy storage batteries is performed, photovoltaic energy storage batteries marked as test samples and test levels of photovoltaic energy storage batteries are obtained, and test conditions of photovoltaic energy storage batteries are set according to the test levels;

[0077] Step S103, after completing the preparatory work for the photovoltaic energy storage battery test, an aging test is performed on the photovoltaic energy storage battery marked as a test sample to obtain the high temperature impact index, low temperature impact index and over-specification charge and discharge impact index of the photovoltaic energy storage battery;

[0078] Step S104, evaluating the anti-aging performance of the photovoltaic energy storage battery in combination with the high temperature impact index, the low temperature impact index and the over-specification charge and discharge impact index, and determining whether the anti-aging performance of the photovoltaic energy storage battery is qualified or unqualified.

[0079] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0080] The present invention firstly performs preparatory work for aging test of photovoltaic energy storage batteries, obtains photovoltaic energy storage batteries marked as test samples and test levels of photovoltaic energy storage batteries, and sets test conditions of photovoltaic energy storage batteries according to the test levels. After completing the preparatory work for testing of photovoltaic energy storage batteries, aging test is performed on photovoltaic energy storage batteries marked as test samples, and the high temperature impact index, low temperature impact index and out-of-specification charge and discharge impact index of photovoltaic energy storage batteries are obtained by the test. Finally, the anti-aging performance of photovoltaic energy storage batteries is evaluated in combination with the high temperature impact index, low temperature impact index and out-of-specification charge and discharge impact index, and the anti-aging performance of photovoltaic energy storage batteries is determined to be qualified or unqualified. The present invention realizes intelligent aging test of photovoltaic energy storage batteries in combination with preliminary analysis results. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0082] Figure 1 is the overall system block diagram of the present invention;

[0083] Figure 2 It is a schematic diagram of the operation of the present invention;

[0084] Figure 3 The present invention is a flow chart of the method. DETAILED DESCRIPTION

[0085] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0086] Example 1: Please refer to Figure 1 and Figure 2 ,The technical solution provided by the present invention is: a photovoltaic energy storage battery aging test system, including a data acquisition module, a test preparation module, a comprehensive test module, a test evaluation module and a server;

[0087] The data acquisition module is used to acquire standard performance data of the photovoltaic energy storage battery and send the standard performance data to the server, and the server sends the standard performance data of the photovoltaic energy storage battery to the test preparation module;

[0088] It should be specifically noted that the standard performance data includes the operating temperature range, standard charging rate, standard discharge rate and standard number of cycles of the photovoltaic energy storage battery, wherein the standard performance data is obtained according to the actual performance of the energy storage battery, the operating temperature range is the appropriate operating temperature of the photovoltaic energy storage battery, in this embodiment, the operating temperature range of the photovoltaic energy storage battery is about 20°C to 45°C, considering the working environment of the photovoltaic energy storage battery, in extreme cases the working temperature of the photovoltaic energy storage battery can reach 85°C, the standard charging rate refers to the constant current value required for the photovoltaic energy storage battery to charge to the rated capacity within a specified time, and the standard discharge rate refers to the current value when the photovoltaic energy storage battery is discharged, for example: when the rated capacity of the photovoltaic energy storage battery is 1000mAh, when the discharge rate of the photovoltaic energy storage battery is 1000mA, the discharge time of the photovoltaic energy storage battery can last for 1 hour, when the discharge rate of the photovoltaic energy storage battery is 200mA, the discharge time of the photovoltaic energy storage battery can last for 5 hours, similarly, assuming that the capacity of the photovoltaic energy storage is C=60Ah, and it is specified to be charged in 20h, then the charging rate of the photovoltaic energy storage battery is 3A.

[0089] See also Figure 2 As shown, the data acquisition module is also used to acquire standard specification data of the photovoltaic energy storage battery and send the standard specification data to the server, and the server sends the standard specification data of the photovoltaic energy storage battery to the test preparation module;

[0090] It should be specifically explained that the standard specification data include the rated capacity, rated saturation voltage, standard internal resistance and sample length, sample width and sample height of the photovoltaic energy storage battery. Among them, the rated capacity is the electric energy capacity of the photovoltaic energy storage battery when it is fully charged, the rated saturation voltage is the voltage value of the photovoltaic energy storage battery when it is fully charged, and the standard internal resistance is the sum of the internal resistances of various electronic components in the photovoltaic energy storage battery.

[0091] The test preparation module is used to complete the preparatory work for the aging test of photovoltaic energy storage batteries. The working process of the module is as follows:

[0092] Obtain the measured length SCi, measured width SKi and measured height SHi of the photovoltaic energy storage battery, where i is the serial number of the photovoltaic energy storage battery, i is a non-zero natural number, and the upper limit of i is n. In the actual working process, a suitable measuring tool can be selected according to the actual size of the photovoltaic energy storage battery, such as a vernier caliper, a tape measure, etc.;

[0093] Obtain the sample length YC, sample width YK and sample height YH of the photovoltaic energy storage battery, and calculate the length error CCi of the photovoltaic energy storage battery according to the formula. The specific formula is as follows:

[0094] CCi=|SCi-YC|;

[0095] Similarly, the width error KCi and height error HCi of the photovoltaic energy storage battery are calculated according to the formula. The specific formula is as follows:

[0096] KCi=|SKi-YK|;

[0097] HCi=|SHi-YH|;

[0098] Compare the length error, width error and height error of the photovoltaic energy storage battery with the error critical value one by one;

[0099] If the value of any one of the length error, width error or height error of the photovoltaic energy storage battery is greater than or equal to the error critical value, the corresponding photovoltaic energy storage battery will be marked as a non-test sample; when the value of any one of the length error, width error or height error of the photovoltaic energy storage battery exceeds the error critical value, it means that the specifications of the photovoltaic energy storage battery do not meet the requirements and lack the meaning of testing. Therefore, such photovoltaic energy storage batteries are marked as non-test samples;

[0100] If the values ​​of the length error, width error and height error of the photovoltaic energy storage battery are all less than the error critical value, the standard charging rate BC, standard discharging rate BF, rated saturation voltage EV and standard internal resistance BR of the photovoltaic energy storage battery are obtained;

[0101] Connect the photovoltaic energy storage battery to a charging device that complies with safety regulations, charge the photovoltaic energy storage battery and measure the actual charging rate SCi of the photovoltaic energy storage battery;

[0102] When the photovoltaic energy storage battery stops charging and the voltage is stable, the voltage value measured by the voltmeter is recorded as the measured saturation voltage SVi of the photovoltaic energy storage battery, and the resistance value measured by the multimeter is recorded as the measured internal resistance SRi of the photovoltaic energy storage battery;

[0103] Connect the photovoltaic energy storage battery to the electrical equipment that complies with safety regulations, supply power to the electrical equipment from the photovoltaic energy storage battery and measure the actual discharge rate SFi of the photovoltaic energy storage battery;

[0104] The parameter compliance coefficient DBi of the photovoltaic energy storage battery is calculated according to the formula. The specific formula is as follows:

[0105] DBi=1 / |SCi-BC|+1 / |SFi-BF|+1 / |SVi-EV|+1 / |SRi-BR|;

[0106] Compare the parameter compliance coefficient of the photovoltaic energy storage battery with the parameter compliance range;

[0107] If the parameter compliance coefficient of the photovoltaic energy storage battery belongs to the first parameter compliance interval, the corresponding photovoltaic energy storage battery will be marked as a non-test sample;

[0108] If the parameter compliance coefficient of the photovoltaic energy storage battery belongs to the second parameter compliance interval, the corresponding photovoltaic energy storage battery will be marked as a test sample; according to the calculation formula of the parameter compliance coefficient DBi, the smaller the value of the parameter compliance coefficient DBi, the lower the probability of its charge and discharge compliance. Therefore, when the parameter compliance coefficient DBi belongs to the first parameter compliance interval, it means that the probability of its charge and discharge compliance is low, and the significance of the test is also small, so it is marked as a non-test sample;

[0109] Among them, the values ​​of the parameter standard interval are all greater than zero, and the values ​​of the first parameter standard interval are all less than the values ​​of the second parameter standard interval;

[0110] The operating temperature range T∈(t1, t2), standard cycle number BX, and rated capacity ER of the photovoltaic energy storage battery marked as a test sample are obtained, and the test intensity value QD of the photovoltaic energy storage battery is calculated according to the formula. The specific formula is as follows:

[0111] QD=(t2-t1)×q1+BX×ER×q2;

[0112] Among them, q1 and q2 are proportional coefficients with fixed values, the values ​​of q1 and q2 are both greater than zero, q1 is the temperature suitability coefficient, and q2 is the charge and discharge capacity coefficient;

[0113] Compare the test intensity value of the photovoltaic energy storage battery with the test intensity threshold;

[0114] If the test intensity value is less than or equal to the first test intensity threshold, the test level of the photovoltaic energy storage battery is determined to be the first test level;

[0115] If the test intensity value is greater than the first test intensity threshold and less than or equal to the second test intensity threshold, the test level of the photovoltaic energy storage battery is determined to be the second test level;

[0116] If the test intensity value is greater than the second test intensity threshold, the test level of the photovoltaic energy storage battery is determined to be the third test level;

[0117] Among them, the values ​​of the first test intensity threshold and the second test intensity threshold are both greater than zero, the first test intensity threshold is less than the second test intensity threshold, the test intensity corresponding to the first test level is lower than the test intensity corresponding to the second test level, and the test intensity corresponding to the second test level is lower than the test intensity corresponding to the third test level.

[0118] The test preparation module transports the photovoltaic energy storage battery marked as a test sample to the comprehensive test module;

[0119] The test preparation module also sends the test level of the photovoltaic energy storage battery to the server, and the server sends the corresponding test conditions to the comprehensive test module according to the test level. The corresponding relationship between the test conditions and the test level is as follows:

[0120] If the test level is the first test level, the corresponding test conditions are the first temperature additional coefficient and the first rate additional coefficient;

[0121] If the test level is the second test level, the corresponding test conditions are the second temperature additional coefficient and the second rate additional coefficient;

[0122] If the test level is the third test level, the corresponding test conditions are the third temperature additional coefficient and the third rate additional coefficient;

[0123] Among them, the first temperature additional coefficient is smaller than the second temperature additional coefficient, the second temperature additional coefficient is smaller than the third temperature additional coefficient, the first rate additional coefficient is smaller than the second rate additional coefficient, and the second rate additional coefficient is smaller than the third rate additional coefficient.

[0124] As a further solution of the present invention, after completing the preparatory work for testing the photovoltaic energy storage battery, the comprehensive testing module performs an aging test on the photovoltaic energy storage battery marked as a test sample. The specific testing process is as follows:

[0125] In this embodiment, the test samples are all photovoltaic energy storage batteries of the same batch and the same specifications, and the slight differences between the batteries can be ignored without affecting the test;

[0126] Dividing the photovoltaic energy storage battery into a control test group, a first test group, a second test group and a third test group;

[0127] The test parameter settings for the control test group are as follows:

[0128] Test temperature = (t1 + t2) / 2; Test charge rate = standard charge rate; Test discharge rate = standard discharge rate;

[0129] The test parameters for the first test group are set to;

[0130] Test temperature = t2 + (t2 - t1) × W; test charge rate = standard charge rate; test discharge rate = standard discharge rate;

[0131] The test parameters for the second test group are set to;

[0132] Test temperature = t1-(t2-t1)×W; Test charge rate = standard charge rate; Test discharge rate = standard discharge rate;

[0133] The test parameters of the third test group are set as;

[0134] Test temperature = (t1 + t2) / 2; Test charge rate = standard charge rate × V; Test discharge rate = standard discharge rate × V;

[0135] Wherein, W is the temperature additional coefficient, V is the rate additional coefficient, and it can be understood that the first test group is used for high temperature environment testing, the second test group is used for low temperature environment testing, and the third test group is used for super-standard charge and discharge rate testing;

[0136] The photovoltaic energy storage batteries in the control test group, the first test group, the second test group and the third test group are subjected to cyclic charge and discharge tests of the same number of cycles, and the performance test data of the photovoltaic energy storage batteries are monitored. The performance test data include the test charging rate SLur, the test battery temperature WDur, the test endurance time XHur and the test battery capacity RLur of the photovoltaic energy storage batteries in each test group during each test. u is the test group number, and the value of u includes 0, 1, 2, and 3. 0 corresponds to the control test group, 1 corresponds to the first test group, 2 corresponds to the second test group, and 3 corresponds to the third test group. r is the test sequence number, and the upper limit of r is R. The value of R is equal to the total number of cycles of the cyclic charge and discharge test of the photovoltaic energy storage battery. Among them, the test charging rate is the minimum charging rate of the photovoltaic energy storage battery corresponding to each test group during the test, and the test battery temperature is the highest battery temperature of the photovoltaic energy storage battery corresponding to each test group during the test.

[0137] The performance test data of the photovoltaic energy storage batteries in the control test group and the first test group are obtained, and the high temperature impact index GW of the photovoltaic energy storage batteries is calculated according to the formula. The specific formula is as follows:

[0138] ;

[0139] In the above formula, SL0r is the test charging rate of the photovoltaic energy storage battery in the control test group, WD0r is the test battery temperature of the photovoltaic energy storage battery in the control test group, XH0r is the test battery life of the photovoltaic energy storage battery in the control test group, RL0r is the test battery capacity of the photovoltaic energy storage battery in the control test group, SL1r is the test charging rate of the photovoltaic energy storage battery in the first test group, WD1r is the test battery temperature of the photovoltaic energy storage battery in the first test group, XH1r is the test battery life of the photovoltaic energy storage battery in the first test group, and RL1r is the test battery capacity of the photovoltaic energy storage battery in the first test group;

[0140] Similarly, the performance test data of the photovoltaic energy storage batteries in the control test group and the second test group are obtained, and the low temperature impact index DW of the photovoltaic energy storage batteries is calculated according to the formula; the specific formula is as follows:

[0141] ;

[0142] The performance test data of the photovoltaic energy storage batteries in the control test group and the third test group are obtained, and the over-specification charge and discharge impact index CF of the photovoltaic energy storage batteries is calculated according to the formula; the specific formula is as follows:

[0143] ;

[0144] The comprehensive test module sends the high temperature impact index, low temperature impact index and out-of-specification charge and discharge impact index of the photovoltaic energy storage battery to the server, and the server sends the high temperature impact index, low temperature impact index and out-of-specification charge and discharge impact index of the photovoltaic energy storage battery to the test and evaluation module.

[0145] The test and evaluation module is used to evaluate the anti-aging performance of photovoltaic energy storage batteries. The evaluation process is as follows:

[0146] Obtain the high temperature impact index GW, low temperature impact index DW and over-specification charge and discharge impact index CF of the photovoltaic energy storage battery, and calculate the anti-aging value KL of the photovoltaic energy storage battery according to the formula. The specific formula is as follows:

[0147] KL=e / [(GW+DW)×k1+CF×k2];

[0148] Among them, k1 is the temperature influence coefficient, k2 is the charge and discharge influence coefficient, and e is a natural constant, which has no special meaning here;

[0149] Compare the anti-aging value of photovoltaic energy storage batteries with the anti-aging threshold;

[0150] If the anti-aging value is greater than the anti-aging threshold, the anti-aging performance of the photovoltaic energy storage battery is determined to be qualified;

[0151] If the anti-aging value is less than or equal to the anti-aging threshold, the anti-aging performance of the photovoltaic energy storage battery is judged to be unqualified;

[0152] In this application, if corresponding calculation formulas appear, the above calculation formulas are all dimensionless and take their numerical calculations. The weight coefficients, proportional coefficients and other coefficients in the formulas are set to a result value obtained by quantifying each parameter. The size of the weight coefficient and the proportional coefficient can be determined as long as it does not affect the proportional relationship between the parameter and the result value.

[0153] Example 2: Please refer to Figure 3 As shown, based on another concept of the same invention, a method for testing aging of photovoltaic energy storage batteries is now proposed, comprising the following steps:

[0154] Step S101, obtaining standard performance data and standard specification data of photovoltaic energy storage batteries;

[0155] Step S102, preparatory work for aging test of photovoltaic energy storage batteries is performed, photovoltaic energy storage batteries marked as test samples and test levels of photovoltaic energy storage batteries are obtained, and test conditions of photovoltaic energy storage batteries are set according to the test levels;

[0156] Step S103, after completing the preparatory work for the photovoltaic energy storage battery test, an aging test is performed on the photovoltaic energy storage battery marked as a test sample to obtain the high temperature impact index, low temperature impact index and over-specification charge and discharge impact index of the photovoltaic energy storage battery;

[0157] Step S104, evaluating the anti-aging performance of the photovoltaic energy storage battery in combination with the high temperature impact index, the low temperature impact index and the over-specification charge and discharge impact index, and determining whether the anti-aging performance of the photovoltaic energy storage battery is qualified or unqualified.

[0158] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A photovoltaic energy storage battery aging test system, characterized in that: It includes data acquisition module, test preparation module, comprehensive test module, test evaluation module and server; The data acquisition module is used to acquire standard performance data and standard specification data of the photovoltaic energy storage battery, and send the standard performance data and standard specification data to the server, and the server sends the standard performance data of the photovoltaic energy storage battery to the test preparation module; The test preparation module is used to complete the preparatory work for the aging test of the photovoltaic energy storage battery. The photovoltaic energy storage battery marked as a test sample is transferred to the comprehensive test module. At the same time, the test preparation module also sends the test level of the photovoltaic energy storage battery obtained by analysis to the server. The server sets the test conditions corresponding to the photovoltaic energy storage battery according to the test level and sends them to the comprehensive test module; After completing the preparatory work for the test of the photovoltaic energy storage battery, the comprehensive test module performs an aging test on the photovoltaic energy storage battery marked as a test sample, and sends the high temperature impact index, low temperature impact index and over-specification charge and discharge impact index of the photovoltaic energy storage battery obtained by the test to the server, and the server sends the high temperature impact index, low temperature impact index and over-specification charge and discharge impact index of the photovoltaic energy storage battery to the test evaluation module; the test evaluation module is used to evaluate the anti-aging performance of the photovoltaic energy storage battery and determine whether the anti-aging performance of the photovoltaic energy storage battery is qualified or unqualified; The working process of the test preparation module is as follows: Obtain the measured length SCi, measured width SKi and measured height SHi of the photovoltaic energy storage battery, where i is the serial number of the photovoltaic energy storage battery, i is a non-zero natural number, and the upper limit value of i is n; Obtain the sample length YC, sample width YK and sample height YH of the photovoltaic energy storage battery, and calculate the length error CCi of the photovoltaic energy storage battery according to the formula. The specific formula is as follows: CCi=|SCi-YC|; Similarly, the width error KCi and height error HCi of the photovoltaic energy storage battery are calculated according to the formula. The specific formula is as follows: KCi=|SKi-YK|; HCi=|SHi-YH|; Compare the length error, width error and height error of the photovoltaic energy storage battery with the error critical value one by one; If the value of any one of the length error, width error or height error of the photovoltaic energy storage battery is greater than or equal to the error critical value, the corresponding photovoltaic energy storage battery will be marked as a non-test sample; The working process of the test preparation module also includes: If the values ​​of the length error, width error and height error of the photovoltaic energy storage battery are all less than the error critical value, the standard charging rate BC, standard discharging rate BF, rated saturation voltage EV and standard internal resistance BR of the photovoltaic energy storage battery are obtained; Connect the photovoltaic energy storage battery to a charging device that complies with safety regulations, charge the photovoltaic energy storage battery and measure the actual charging rate SCi of the photovoltaic energy storage battery; When the photovoltaic energy storage battery stops charging and the voltage is stable, the measured voltage value is recorded as the measured saturation voltage SVi of the photovoltaic energy storage battery, and the measured resistance value is recorded as the measured internal resistance SRi of the photovoltaic energy storage battery; Connect the photovoltaic energy storage battery to the electrical equipment that complies with safety regulations, supply power to the electrical equipment from the photovoltaic energy storage battery and measure the actual discharge rate SFi of the photovoltaic energy storage battery; The parameter compliance coefficient DBi of the photovoltaic energy storage battery is calculated according to the formula. The specific formula is as follows: DBi=1 / |SCi-BC|+1 / |SFi-BF|+1 / |SVi-EV|+1 / |SRi-BR|; Compare the parameter compliance coefficient of the photovoltaic energy storage battery with the parameter compliance range; If the parameter compliance coefficient of the photovoltaic energy storage battery belongs to the first parameter compliance interval, the corresponding photovoltaic energy storage battery will be marked as a non-test sample; If the parameter compliance coefficient of the photovoltaic energy storage battery belongs to the second parameter compliance interval, the corresponding photovoltaic energy storage battery will be marked as a test sample; Among them, the values ​​of the parameter standard interval are all greater than zero, and the values ​​of the first parameter standard interval are all smaller than the values ​​of the second parameter standard interval.

2. A photovoltaic energy storage battery aging test system according to claim 1, characterized in that: Standard performance data include the operating temperature range, standard charging rate, standard discharge rate and standard number of cycles of photovoltaic energy storage batteries; The standard specification data includes the rated capacity, rated saturation voltage, standard internal resistance of the photovoltaic energy storage battery, and the sample length, sample width and sample height of the photovoltaic energy storage battery.

3. A photovoltaic energy storage battery aging test system according to claim 2, characterized in that: The working process of the test preparation module also includes: The operating temperature range T∈(t1, t2), standard cycle number BX, and rated capacity ER of the photovoltaic energy storage battery marked as a test sample are obtained, and the test intensity value QD of the photovoltaic energy storage battery is calculated according to the formula. The specific formula is as follows: QD=(t2-t1)×q1+BX×ER×q2; Among them, q1 and q2 are proportional coefficients with fixed values, the values ​​of q1 and q2 are both greater than zero, q1 is the temperature suitability coefficient, and q2 is the charge and discharge capacity coefficient; The test intensity value of the photovoltaic energy storage battery is compared with the test intensity threshold to determine whether the test level of the photovoltaic energy storage battery is the first test level, the second test level or the third test level.

4. A photovoltaic energy storage battery aging test system according to claim 3, characterized in that: The test intensity corresponding to the first test level is lower than the test intensity corresponding to the second test level; The test intensity corresponding to the second test level is lower than the test intensity corresponding to the third test level.

5. A photovoltaic energy storage battery aging test system according to claim 4, characterized in that: The correspondence between test conditions and test levels is as follows: If the test level is the first test level, the corresponding test conditions are the first temperature additional coefficient and the first rate additional coefficient; If the test level is the second test level, the corresponding test conditions are the second temperature additional coefficient and the second rate additional coefficient; If the test level is the third test level, the corresponding test conditions are the third temperature additional coefficient and the third rate additional coefficient; Among them, the first temperature additional coefficient is smaller than the second temperature additional coefficient, the second temperature additional coefficient is smaller than the third temperature additional coefficient, the first rate additional coefficient is smaller than the second rate additional coefficient, and the second rate additional coefficient is smaller than the third rate additional coefficient.

6. A photovoltaic energy storage battery aging test system according to claim 5, characterized in that: The testing process of the comprehensive testing module is as follows: Dividing the photovoltaic energy storage battery into a control test group, a first test group, a second test group and a third test group; The test parameter settings for the control test group are as follows: Test temperature = (t1 + t2) / 2; Test charge rate = standard charge rate; Test discharge rate = standard discharge rate; The test parameters for the first test group are set to; Test temperature = t2 + (t2-t1) × W; Test charge rate = standard charge rate; test discharge rate = standard discharge rate; The test parameters for the second test group are set to; Test temperature = t1-(t2-t1)×W; Test charge rate = standard charge rate; test discharge rate = standard discharge rate; The test parameters of the third test group are set as; Test temperature = (t1 + t2) / 2; Test charge rate = standard charge rate × V; Test discharge rate = standard discharge rate × V; Wherein, W is the temperature additional coefficient, V is the rate additional coefficient, and it can be understood that the first test group is used for high temperature environment testing, the second test group is used for low temperature environment testing, and the third test group is used for super-standard charge and discharge rate testing; The photovoltaic energy storage batteries in the control test group, the first test group, the second test group and the third test group are subjected to cyclic charge and discharge tests of the same number of cycles, and the performance test data of the photovoltaic energy storage batteries are monitored. The performance test data include the test charging rate SLur, the test battery temperature WDur, the test endurance time XHur and the test battery capacity RLur of the photovoltaic energy storage batteries in each test group during each test. u is the test group number, and the value of u includes 0, 1, 2, and 3. 0 corresponds to the control test group, 1 corresponds to the first test group, 2 corresponds to the second test group, and 3 corresponds to the third test group. r is the test sequence number, and the upper limit of r is R. The value of R is equal to the total number of cycles of the cyclic charge and discharge test of the photovoltaic energy storage battery. Among them, the test charging rate is the minimum charging rate of the photovoltaic energy storage battery corresponding to each test group during the test, and the test battery temperature is the highest battery temperature of the photovoltaic energy storage battery corresponding to each test group during the test. The performance test data of the photovoltaic energy storage batteries in the control test group and the first test group are obtained, and the high temperature impact index GW of the photovoltaic energy storage batteries is calculated according to the formula. The specific formula is as follows: ； In the above formula, SL0r is the test charging rate of the photovoltaic energy storage battery in the control test group, WD0r is the test battery temperature of the photovoltaic energy storage battery in the control test group, XH0r is the test battery life of the photovoltaic energy storage battery in the control test group, RL0r is the test battery capacity of the photovoltaic energy storage battery in the control test group, SL1r is the test charging rate of the photovoltaic energy storage battery in the first test group, WD1r is the test battery temperature of the photovoltaic energy storage battery in the first test group, XH1r is the test battery life of the photovoltaic energy storage battery in the first test group, and RL1r is the test battery capacity of the photovoltaic energy storage battery in the first test group; Similarly, the performance test data of the photovoltaic energy storage batteries in the control test group and the second test group are obtained, and the low temperature impact index DW of the photovoltaic energy storage batteries is calculated according to the formula; the specific formula is as follows: ； The performance test data of the photovoltaic energy storage batteries in the control test group and the third test group are obtained, and the over-specification charge and discharge impact index CF of the photovoltaic energy storage batteries is calculated according to the formula; the specific formula is as follows: 。 7. A photovoltaic energy storage battery aging test system according to claim 6, characterized in that: The evaluation process of the test evaluation module is as follows: Obtain the high temperature impact index GW, low temperature impact index DW and over-specification charge and discharge impact index CF of the photovoltaic energy storage battery, and calculate the anti-aging value KL of the photovoltaic energy storage battery according to the formula. The specific formula is as follows: KL=e / [(GW+DW)×k1+CF×k2]; Among them, k1 is the temperature influence coefficient, k2 is the charge and discharge influence coefficient, and e is the natural constant; Compare the anti-aging value of photovoltaic energy storage batteries with the anti-aging threshold; If the anti-aging value is greater than the anti-aging threshold, the anti-aging performance of the photovoltaic energy storage battery is determined to be qualified; If the anti-aging value is less than or equal to the anti-aging threshold, the anti-aging performance of the photovoltaic energy storage battery is judged to be unqualified.

8. A method for testing aging of photovoltaic energy storage batteries, characterized in that: A photovoltaic energy storage battery aging test system according to any one of claims 1 to 7, the method comprising the following steps: Step S101, obtaining standard performance data and standard specification data of photovoltaic energy storage batteries; Step S102, preparatory work for aging test of photovoltaic energy storage batteries is performed, photovoltaic energy storage batteries marked as test samples and test levels of photovoltaic energy storage batteries are obtained, and test conditions of photovoltaic energy storage batteries are set according to the test levels; Step S103, after completing the preparatory work for the photovoltaic energy storage battery test, an aging test is performed on the photovoltaic energy storage battery marked as a test sample to obtain the high temperature impact index, low temperature impact index and over-specification charge and discharge impact index of the photovoltaic energy storage battery; Step S104, evaluating the anti-aging performance of the photovoltaic energy storage battery in combination with the high temperature impact index, the low temperature impact index and the over-specification charge and discharge impact index, and determining whether the anti-aging performance of the photovoltaic energy storage battery is qualified or unqualified.

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