Superhigh-temperature electrolyte battery performance monitoring system

Abstract

The invention relates to the technical field of electrolyte battery performance monitoring, in particular to an ultra-high-temperature electrolyte battery performance monitoring system, which comprises a battery division module, a constant-temperature battery pack and a variable-temperature battery pack, the temperature division module is provided with a plurality of test temperature points; the constant-temperature test module performs constant-temperature charging and discharging test and records constant-temperature battery parameters; the constant-temperature analysis module is used for analyzing the plurality of constant-temperature battery parameters, determining the actual anomaly degree, and obtaining and adjusting the constant-temperature battery parameters and determining the constant-temperature performance based on a comparison result with a preset anomaly degree interval, or determining that the constant-temperature performance of the electrolyte battery is poor; a temperature change test module draws a temperature rise parameter change curve and a temperature drop parameter change curve; the temperature change analysis module determines the temperature rise stability and the temperature drop stability, adjusts a preset temperature interval when abnormity occurs, and determines the temperature change performance of the electrolyte battery; and the performance evaluation module determines the comprehensive performance of the electrolyte battery. According to the invention, the accuracy of the performance evaluation result of the electrolyte battery at high temperature is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolyte battery performance monitoring, and in particular to an ultra-high temperature electrolyte battery performance monitoring system. Background Art

[0002] As a new energy source with excellent comprehensive performance, lithium-ion batteries are widely used in various fields. The scope of use of lithium-ion batteries is not only limited by the operating temperature, but also by the region. Some EV / HEV power batteries may have to work in a high-temperature environment for a long time, and even some batteries for aerospace and military equipment need to operate at ultra-high temperatures. In a high-temperature environment, the chemical reaction inside the battery will accelerate, causing the battery capacity to decay and shorten its life. At the same time, high temperature will also cause gas to be generated inside the battery, increase the internal pressure of the battery, and may even cause an explosion.

[0003] The patent document with Chinese patent application publication number CN114608996A discloses a method for detecting the wetting performance of lithium-ion battery electrolyte, comprising the following steps: a first step, pre-making a plurality of identical batteries that have been dried; a second step, injecting a plurality of different electrolytes into a battery respectively, to obtain a plurality of batteries injected with different electrolytes; a third step, placing all the batteries in a static state, and respectively performing AC internal resistance tests; a fourth step, for each battery, when the AC internal resistance of the battery detected twice before and after does not change, taking the detection time corresponding to the AC internal resistance detected once as the infiltration time consumed by the electrolyte injected into the battery; and comparing and judging the wetting performance of the electrolyte injected into the plurality of batteries according to the infiltration time consumed by the electrolyte injected into the plurality of batteries.

[0004] The existing technology does not fully consider the overall performance of the battery in a high temperature environment, resulting in inaccurate performance evaluation results of the electrolyte battery under high temperature conditions. Summary of the invention

[0005] To this end, the present invention provides an ultra-high temperature electrolyte battery performance monitoring system, which can solve the problem of inaccurate performance evaluation results of electrolyte batteries under high temperature conditions by monitoring the performance of electrolyte batteries under constant temperature and variable temperature conditions to comprehensively evaluate the performance of the battery in a high temperature environment.

[0006] To achieve the above object, the present invention provides an ultra-high temperature electrolyte battery performance monitoring system, the system comprising: a battery division module, for selecting a number of electrolyte batteries in the same electrolyte battery manufacturing batch as a test battery group, and dividing the test battery group into a constant temperature battery group and a variable temperature battery group;

[0007] A temperature division module is used to set a test temperature interval and set a number of test temperature points in the test temperature interval at preset temperature intervals;

[0008] A constant temperature test module, connected to the temperature division module, for placing the constant temperature battery pack at a plurality of test temperature points for constant temperature charge and discharge test, and recording the constant temperature battery parameters of the electrolyte battery corresponding to each test temperature point in real time at a preset detection frequency;

[0009] a constant temperature analysis module connected to the constant temperature test module, for analyzing the constant temperature battery parameters corresponding to any test temperature point, determining the actual abnormality of the constant temperature battery parameters based on the analysis results, comparing the actual abnormality with a preset abnormality interval, adjusting the preset detection frequency based on the comparison result to obtain a plurality of adjusted constant temperature battery parameters, and determining the constant temperature performance of the electrolyte battery based on the plurality of adjusted constant temperature battery parameters, or determining the poor constant temperature performance of the electrolyte battery corresponding to the current test temperature point;

[0010] A variable temperature test module, connected to the temperature division module, for setting a temperature increase process according to a preset temperature interval and the test temperature interval, detecting the temperature increase battery parameters corresponding to each temperature increase test point of the variable temperature battery pack, and drawing a temperature increase parameter change curve based on a number of temperature increase battery parameters; setting a temperature decrease process according to the preset temperature interval and the test temperature interval, detecting the temperature decrease battery parameters corresponding to each temperature decrease test point of the variable temperature battery pack, and drawing a temperature decrease parameter change curve based on a number of temperature decrease battery parameters;

[0011] a variable temperature analysis module, connected to the variable temperature test module, for analyzing the temperature rise parameter change curve and the temperature drop parameter change curve respectively, determining the temperature rise stability and the temperature drop stability of the electrolyte battery based on the analysis results, and when the temperature rise stability or the temperature drop stability is abnormal, adjusting the preset temperature interval and determining the variable temperature performance of the electrolyte battery;

[0012] A performance evaluation module is connected to the constant temperature analysis module and the variable temperature analysis module, and is used to determine the comprehensive performance of the electrolyte battery based on the constant temperature performance and the variable temperature performance.

[0013] Furthermore, the constant temperature test module includes:

[0014] A testing unit, used to control the constant temperature battery pack to perform at least one constant temperature charge and discharge test at each test temperature point with a preset charge and discharge cycle;

[0015] A data acquisition unit is connected to the test unit and is used to collect a number of test battery parameters during the charge and discharge test of any of the constant temperature battery packs at any of the test temperature points at a preset detection frequency, wherein the test battery parameters include a test current value and a test resistance value.

[0016] Furthermore, the constant temperature analysis module comprises:

[0017] an identification unit, configured to identify an abnormal current value among the plurality of test current values, and to identify an abnormal resistance value among the plurality of test resistance values, and to determine the actual abnormality based on the abnormal current value and the abnormal resistance value, respectively;

[0018] a comparison unit connected to the identification unit, for comparing the actual abnormality with a preset abnormality interval to determine whether a preset detection frequency needs to be adjusted;

[0019] An adjustment unit connected to the comparison unit, for adjusting the preset detection frequency according to the comparison result, obtaining the adjusted detection frequency, and obtaining a number of adjusted current values ​​and a number of adjusted resistance values ​​corresponding to the electrolyte battery at any test temperature point according to the adjusted detection frequency;

[0020] The analysis unit is connected to the adjustment unit, and is used to calculate the actual battery capacity based on the several adjustment current values, calculate the battery capacity decay rate based on the actual battery capacity, calculate the actual resistance change rate based on the several adjustment resistance values, and determine the constant temperature performance based on the battery capacity decay rate and the actual resistance change rate.

[0021] Furthermore, the identification unit includes:

[0022] A first calculation subunit is used to calculate a ratio of the abnormal number of the abnormal current values ​​to the total number of the test current values ​​as a first abnormal value;

[0023] A second calculation subunit is used to calculate the ratio of the abnormal number of the abnormal resistance values ​​to the total number of the test resistance values ​​as a second abnormal value;

[0024] The abnormality determination subunit is connected to the first calculation subunit and the second calculation subunit, and is used to calculate the actual abnormality degree based on the first abnormal value and the second abnormal value.

[0025] Furthermore, the analysis unit comprises:

[0026] a capacitance calculation subunit, configured to determine a plurality of charging adjustment current values ​​in the charging process and a plurality of discharging adjustment current values ​​in the discharging process based on the charging and discharging test process, calculate the charging battery capacity based on the plurality of charging adjustment current values ​​and an ampere-hour integration algorithm, calculate the discharging battery capacity based on the plurality of discharging adjustment current values ​​and an ampere-hour integration algorithm, and determine the actual battery capacity based on the charging battery capacity and the discharging battery capacity;

[0027] a capacity decay calculation subunit, connected to the capacitance calculation subunit, for calculating the battery capacity decay rate based on the actual battery capacity and the preset battery capacity;

[0028] a resistance calculation subunit, configured to calculate the actual resistance change rate based on a plurality of the adjustment resistance values ​​and a preset resistance value;

[0029] The performance determination subunit is connected to the capacitance calculation subunit and the resistance calculation subunit, and is used to determine the constant temperature performance based on the battery capacity decay rate and the actual resistance change rate.

[0030] Furthermore, the variable temperature test module includes:

[0031] A heating unit, used to set a heating process according to a preset heating interval and the test temperature range, detect a heating current value and a heating resistance value corresponding to each heating test point of the variable temperature battery pack, draw a heating current variation curve based on a plurality of heating current values, and draw a heating resistance variation curve based on a plurality of heating resistance values;

[0032] A cooling unit is used to set a cooling process according to a preset time interval and the test temperature range, detect the cooling current value and the cooling resistance value corresponding to each cooling test point of the variable temperature battery pack, draw a cooling current change curve based on a number of cooling current values, and draw a cooling resistance change curve based on a number of cooling resistance values.

[0033] Furthermore, the variable temperature analysis module includes:

[0034] A temperature rise determination unit, used to judge the temperature rise current change curve and the temperature rise resistance change curve respectively, determine the temperature rise current stability and the temperature rise resistance stability based on the judgment results, and determine the temperature rise stability based on the temperature rise current stability and the temperature rise resistance stability;

[0035] A temperature reduction determination unit, used to judge the temperature reduction current change curve and the temperature reduction resistance change curve respectively, determine the temperature reduction current stability and the temperature reduction resistance stability based on the judgment results, and determine the temperature reduction stability based on the temperature reduction current stability and the temperature reduction resistance stability;

[0036] A temperature change determination unit is connected to the temperature rise determination unit and the temperature drop determination unit, and is used to adjust the preset temperature interval to obtain an adjusted temperature interval when the temperature rise stability is abnormal or the temperature drop stability is abnormal, re-detect and draw a change curve based on the adjusted temperature interval to determine the temperature rise stability and the temperature drop stability, and determine the temperature change performance of the electrolyte battery according to the temperature rise stability and the temperature drop stability.

[0037] Furthermore, the temperature rise determination unit includes:

[0038] A current judgment subunit, used to judge the stability of the temperature-increasing current variation curve based on the slope value at each point on the temperature-increasing current variation curve, and obtain the temperature-increasing current stability;

[0039] A resistance judgment subunit, used to judge the stability of the temperature-increasing resistance change curve based on the slope value at each point on the temperature-increasing resistance change curve, and obtain the temperature-increasing resistance stability;

[0040] The temperature rise determination subunit is connected to the current judgment subunit and the temperature rise determination subunit, and is used to determine the temperature rise stability based on the temperature rise current stability and the temperature rise resistance stability.

[0041] Furthermore, the adjustment unit includes:

[0042] a parameter calculation subunit, for calculating an adjustment parameter based on a degree of abnormality of the heating stability or a degree of abnormality of the cooling stability when the heating stability is abnormal or the cooling stability is abnormal;

[0043] The adjustment subunit is connected to the parameter calculation subunit and is used to adjust the preset temperature interval based on the adjustment parameter to obtain the adjusted temperature interval.

[0044] Furthermore, the performance evaluation module is used to determine that when both the constant temperature performance and the variable temperature performance are poor, the comprehensive performance is poor, and when both the constant temperature performance and the variable temperature performance are excellent, the comprehensive performance is excellent.

[0045] Compared with the prior art, the beneficial effect of the present invention lies in that, by setting the battery division module, several batteries in the same electrolyte battery manufacturing batch are selected as test objects, and divided into constant temperature battery groups and variable temperature battery groups, thereby ensuring the consistency and comparability of the test, and helping to more accurately evaluate the performance of the electrolyte battery under different temperature conditions, thereby improving the reliability and effectiveness of the test results; by setting the test temperature range and the preset temperature interval by setting the temperature division module, it is helpful to determine the changes of the battery at different temperatures, and provide accurate data support for subsequent performance analysis; by setting the constant temperature test module to perform charge and discharge tests on the battery under constant temperature conditions, and record the battery parameters in real time, it can accurately reflect the working state of the battery at a stable temperature, and help to more accurately evaluate the constant temperature performance of the battery; by setting the constant temperature analysis module to analyze the constant temperature battery parameters, determine the actual abnormality and compare it with the preset abnormality interval, and timely discover the battery performance. The abnormal points of energy can be detected, and the preset detection frequency is adjusted according to the comparison result, which is helpful to obtain key data more efficiently and improve the flexibility and accuracy of the test. The constant temperature performance of the battery is determined based on the adjusted data, which provides an important basis for the comprehensive performance evaluation. By setting the variable temperature test module to simulate the heating and cooling process of the battery, the performance of the battery under different temperature changes is detected, which is helpful to evaluate the thermal stability and temperature adaptability of the battery. By setting the variable temperature analysis module to analyze the heating parameter change curve and the cooling parameter change curve, the performance stability of the battery in the temperature change process can be intuitively reflected. When the heating or cooling stability is found to be abnormal, the preset temperature interval is adjusted and re-tested to further refine the analysis and more accurately determine the variable temperature performance of the battery. By setting the performance evaluation module to comprehensively evaluate the constant temperature performance and variable temperature performance, the comprehensive performance of the electrolyte battery can be comprehensively reflected, and the accuracy of the comprehensive performance monitoring results of the electrolyte battery can be improved.

[0046] In particular, by setting the test unit to control the constant temperature battery pack to perform at least one constant temperature charge and discharge test at each test temperature point with a preset charge and discharge cycle, the standardization and repeatability of the test are ensured, which helps to obtain consistent test results. By setting the data acquisition unit to collect test battery parameters at a preset detection frequency, the performance changes of the battery during the charge and discharge process are monitored in real time, thereby more accurately evaluating the constant temperature performance of the battery at different temperatures.

[0047] In particular, by setting the identification unit to identify abnormal current values ​​and abnormal resistance values, potential problems in battery performance can be effectively screened out, thereby providing key data for subsequent analysis. By comparing the actual abnormality with the preset abnormality range, abnormal points in battery performance can be discovered in a timely manner to ensure the accuracy of the test results. By setting the comparison unit to adjust the preset detection frequency when determining that the actual abnormality exceeds the preset abnormality range, the test process is made more flexible and can be optimized according to the actual performance of the battery, thereby improving the efficiency and accuracy of the test. The calculation method of the increase coefficient ensures that the adjustment of the preset detection frequency is proportional to the actual abnormality, so that the adjusted detection frequency can more accurately reflect the performance changes of the battery at a specific temperature. The accuracy of the test frequency is ensured by introducing the increase coefficient. By setting the analysis unit to calculate the actual battery capacity and the actual resistance change rate based on the adjusted current value and resistance value, the constant temperature performance of the battery is further determined, and the performance of the battery under constant temperature conditions is more comprehensively evaluated, providing an accurate basis for the comprehensive performance evaluation of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A structural block diagram of an ultra-high temperature electrolyte battery performance monitoring system provided by an embodiment of the present invention;

[0049] Figure 2 A structural block diagram of a constant temperature analysis module of an ultra-high temperature electrolyte battery performance monitoring system provided in an embodiment of the present invention;

[0050] Figure 3 A structural block diagram of a variable temperature test module of an ultra-high temperature electrolyte battery performance monitoring system provided in an embodiment of the present invention;

[0051] Figure 4 A structural block diagram of a variable temperature analysis module of an ultra-high temperature electrolyte battery performance monitoring system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0053] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0054] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0055] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] See also Figure 1 As shown, an embodiment of the present invention provides an ultra-high temperature electrolyte battery performance monitoring system, the system comprising:

[0057] A battery division module 10, for selecting a number of electrolyte batteries in the same electrolyte battery manufacturing batch as a test battery group, and dividing the test battery group into a constant temperature battery group and a variable temperature battery group;

[0058] The temperature division module 20 is used to set a test temperature interval and set a plurality of test temperature points in the test temperature interval at preset temperature intervals;

[0059] A constant temperature test module 30, connected to the temperature division module 20, is used to place the constant temperature battery pack at a plurality of test temperature points for constant temperature charge and discharge test, and to record the constant temperature battery parameters of the electrolyte battery corresponding to each test temperature point in real time at a preset detection frequency;

[0060] The constant temperature analysis module 40 is connected to the constant temperature test module 30, and is used to analyze the constant temperature battery parameters corresponding to any test temperature point, determine the actual abnormality of the constant temperature battery parameters based on the analysis results, compare the actual abnormality with the preset abnormality interval, adjust the preset detection frequency based on the comparison result to obtain a number of adjusted constant temperature battery parameters, and determine the constant temperature performance of the electrolyte battery based on the number of adjusted constant temperature battery parameters, or determine the electrolyte battery constant temperature performance difference corresponding to the current test temperature point;

[0061] The variable temperature test module 50 is connected to the temperature division module 20, and is used to set a heating process according to a preset temperature interval and the test temperature interval, detect the heating battery parameters corresponding to each heating test point of the variable temperature battery pack, and draw a heating parameter change curve based on a plurality of heating battery parameters, set a cooling process according to the preset temperature interval and the test temperature interval, detect the cooling battery parameters corresponding to each cooling test point of the variable temperature battery pack, and draw a cooling parameter change curve based on a plurality of cooling battery parameters;

[0062] a variable temperature analysis module 60, connected to the variable temperature test module 50, for analyzing the temperature rise parameter change curve and the temperature drop parameter change curve respectively, and determining the temperature rise stability and the temperature drop stability of the electrolyte battery based on the analysis results; when the temperature rise stability or the temperature drop stability is abnormal, adjusting the preset temperature interval, and determining the variable temperature performance of the electrolyte battery;

[0063] The performance evaluation module 70 is connected to the constant temperature analysis module 40 and the variable temperature analysis module 60, and is used to determine the comprehensive performance of the electrolyte battery based on the constant temperature performance and the variable temperature performance.

[0064] Specifically, the number of electrolyte batteries selected by the battery classification module 10 in the embodiment of the present invention in the same electrolyte battery manufacturing batch may be 1 / 50 of the total number of electrolyte batteries in the same electrolyte battery manufacturing batch, wherein the total number of electrolyte batteries in the same electrolyte battery manufacturing batch is greater than or equal to 100;

[0065] The test battery groups are divided into constant temperature battery groups and variable temperature battery groups, wherein the number of constant temperature battery groups = the number of variable temperature battery groups.

[0066] Specifically, the test temperature interval in the temperature division module 20 described in the embodiment of the present invention is set according to the operating temperature range of the electrolyte battery, which can be 60°C to 80°C, and the preset temperature interval can be set to 5°C, thereby forming multiple test temperature points within the test temperature interval, such as 60°C, 65°C, 70°C, 75°C, and 80°C.

[0067] Specifically, the embodiment of the present invention selects several batteries in the same electrolyte battery manufacturing batch as test objects by setting the battery division module, and divides them into constant temperature battery groups and variable temperature battery groups, thereby ensuring the consistency and comparability of the test, and helping to more accurately evaluate the performance of the electrolyte battery under different temperature conditions, thereby improving the reliability and effectiveness of the test results. By setting the test temperature range and the preset temperature interval by setting the temperature division module, it is helpful to determine the changes of the battery at different temperatures, and provide accurate data support for subsequent performance analysis. By setting the constant temperature test module to perform charge and discharge tests on the battery under constant temperature conditions and record the battery parameters in real time, it can accurately reflect the working state of the battery at a stable temperature, and help to more accurately evaluate the constant temperature performance of the battery. By setting the constant temperature analysis module to analyze the constant temperature battery parameters, the actual abnormality is determined and compared with the preset abnormality range, so as to promptly discover abnormalities in battery performance. point, adjusting the preset detection frequency according to the comparison result helps to obtain key data more efficiently, improve the flexibility and accuracy of the test, determine the constant temperature performance of the battery based on the adjusted data, and provide an important basis for comprehensive performance evaluation. By setting the variable temperature test module to simulate the heating and cooling process of the battery, the performance of the battery under different temperature changes is detected, which helps to evaluate the thermal stability and temperature adaptability of the battery. By setting the variable temperature analysis module to analyze the heating parameter change curve and the cooling parameter change curve, the performance stability of the battery in the temperature change process can be intuitively reflected. When the heating or cooling stability is found to be abnormal, the preset temperature interval is adjusted and retested to further refine the analysis and more accurately determine the variable temperature performance of the battery. By setting the performance evaluation module to comprehensively evaluate the constant temperature performance and variable temperature performance, the comprehensive performance of the electrolyte battery can be comprehensively reflected, and the accuracy of the comprehensive performance monitoring results of the electrolyte battery can be improved.

[0068] Specifically, the constant temperature test module 30 includes:

[0069] A testing unit, used to control the constant temperature battery pack to perform at least one constant temperature charge and discharge test at each test temperature point with a preset charge and discharge cycle;

[0070] A data acquisition unit is connected to the test unit and is used to collect a number of test battery parameters during the charge and discharge test of any of the constant temperature battery packs at any of the test temperature points at a preset detection frequency, wherein the test battery parameters include a test current value and a test resistance value.

[0071] Specifically, the preset charge and discharge cycle in the embodiment of the present invention is the time taken by a number of the electrolyte batteries to complete one charge and discharge during the historical test process;

[0072] The preset detection frequency is 1 / 10 of the preset charge and discharge cycle.

[0073] Specifically, the embodiment of the present invention ensures the standardization and repeatability of the test by setting the test unit to control the constant temperature battery pack to perform at least one constant temperature charge and discharge test at each test temperature point with a preset charge and discharge cycle, which helps to obtain consistent test results. By setting the data acquisition unit to collect test battery parameters at a preset detection frequency, the performance changes of the battery during the charge and discharge process are monitored in real time, thereby more accurately evaluating the constant temperature performance of the battery at different temperatures.

[0074] See also Figure 2 As shown, the constant temperature analysis module 40 includes:

[0075] an identification unit 41, used for identifying an abnormal current value among the test current values, and identifying an abnormal resistance value among the test resistance values, and determining the actual abnormality based on the abnormal current value and the abnormal resistance value respectively;

[0076] A comparison unit 42, connected to the identification unit 41, for comparing the actual abnormality with a preset abnormality interval to determine whether a preset detection frequency needs to be adjusted;

[0077] An adjustment unit 43, connected to the comparison unit 42, for adjusting the preset detection frequency according to the comparison result, obtaining the adjusted detection frequency, and obtaining a number of adjusted current values ​​and a number of adjusted resistance values ​​corresponding to the electrolyte battery at any test temperature point according to the adjusted detection frequency;

[0078] The analysis unit 44 is connected to the adjustment unit 43, and is used to calculate the actual battery capacity based on the several adjusted current values, calculate the battery capacity decay rate based on the actual battery capacity, calculate the actual resistance change rate based on the several adjusted resistance values, and determine the constant temperature performance based on the battery capacity decay rate and the actual resistance change rate.

[0079] Specifically, the preset abnormality interval in the embodiment of the present invention is [1 / 5, 1 / 3].

[0080] Specifically, the comparison unit in the embodiment of the present invention is used to adjust the preset detection frequency when the actual abnormality is within the preset abnormality range;

[0081] When the actual abnormality is greater than the preset abnormality interval, determining that the electrolyte battery constant temperature performance corresponding to the current test temperature point is poor;

[0082] When the actual abnormality is less than the preset abnormality interval, no adjustment is made, the actual battery capacity is calculated based on several of the test current values, the actual resistance change rate is calculated based on several of the test resistance values, and the constant temperature performance is determined based on the actual battery capacity and the actual resistance change rate.

[0083] Specifically, the adjustment unit in the embodiment of the present invention is used to calculate an increase coefficient based on a comparison result between the actual abnormality and the preset abnormality interval, and to increase and adjust the preset detection frequency based on the increase coefficient to obtain the adjusted detection frequency.

[0084] Specifically, the increase parameter in the embodiment of the present invention = (actual abnormality - minimum value of the preset abnormality interval) / minimum value of the preset abnormality interval;

[0085] The adjusted detection frequency=(1+increase parameter)×preset detection frequency.

[0086] Specifically, the embodiment of the present invention effectively screens out potential problems of battery performance by setting the identification unit to identify abnormal current values ​​and abnormal resistance values, thereby providing key data for subsequent analysis, and timely discovers abnormal points of battery performance by comparing the actual abnormality with the preset abnormality range, thereby ensuring the accuracy of the test results. By setting the comparison unit to adjust the preset detection frequency when determining that the actual abnormality exceeds the preset abnormality range, the test process is made more flexible and can be optimized according to the actual performance of the battery, thereby improving the efficiency and accuracy of the test. The calculation method of the increase coefficient ensures that the adjustment of the preset detection frequency is proportional to the actual abnormality, so that the adjusted detection frequency can more accurately reflect the performance changes of the battery at a specific temperature. The accuracy of the test frequency is ensured by introducing the increase coefficient. By setting the analysis unit to calculate the actual battery capacity and the actual resistance change rate based on the adjusted current value and resistance value, the constant temperature performance of the battery is further determined, and the performance of the battery under constant temperature conditions is more comprehensively evaluated, providing an accurate basis for the comprehensive performance evaluation of the battery.

[0087] Specifically, the identification unit includes:

[0088] A first calculation subunit is used to calculate a ratio of the abnormal number of the abnormal current values ​​to the total number of the test current values ​​as a first abnormal value;

[0089] A second calculation subunit is used to calculate the ratio of the abnormal number of the abnormal resistance values ​​to the total number of the test resistance values ​​as a second abnormal value;

[0090] The abnormality determination subunit is connected to the first calculation subunit and the second calculation subunit, and is used to calculate the actual abnormality degree based on the first abnormal value and the second abnormal value.

[0091] Specifically, the actual abnormality degree described in the embodiment of the present invention=α1×first abnormal value+α2×second abnormal value, wherein α1 and α2 are calculation weights, and α1+α2=1.

[0092] Specifically, the analysis unit includes:

[0093] a capacitance calculation subunit, configured to determine a plurality of charging adjustment current values ​​in the charging process and a plurality of discharging adjustment current values ​​in the discharging process based on the charging and discharging test process, calculate the charging battery capacity based on the plurality of charging adjustment current values ​​and an ampere-hour integration algorithm, calculate the discharging battery capacity based on the plurality of discharging adjustment current values ​​and an ampere-hour integration algorithm, and determine the actual battery capacity based on the charging battery capacity and the discharging battery capacity;

[0094] a capacity decay calculation subunit, connected to the capacitance calculation subunit, for calculating the battery capacity decay rate based on the actual battery capacity and the preset battery capacity;

[0095] a resistance calculation subunit, configured to calculate the actual resistance change rate based on a plurality of the adjustment resistance values ​​and a preset resistance value;

[0096] The performance determination subunit is connected to the capacitance calculation subunit and the resistance calculation subunit, and is used to determine the constant temperature performance based on the battery capacity decay rate and the actual resistance change rate.

[0097] Specifically, the capacity of the rechargeable battery in the embodiment of the present invention is Where, Ci is the capacity of the rechargeable battery, I i ’ (t) is the adjusted current value corresponding to the detection time t, ti is the total duration of the charging test process, and the discharge battery capacity is Among them, C ’ i is the discharge battery capacity, I i "(t) is the adjustment current value corresponding to the detection time t, ti ’ is the total duration of the discharge test process, the actual battery capacity = 1 / 2×(Ci+C ’ i)

[0098] An example of an embodiment of the present invention is: during a charging test, the detection time t (hour) is 0, 1, 2, 3, and the corresponding adjustment current value I i ’ (t) (amperes) is 5, 4, 3, 2, approximate integration using the trapezoidal rule: Where n is the number of data points (4 in this example), t k is the moment of the kth data point. Substitute the given data into the formula: Ci≈(5+4) / 2×1+(4+3) / 2×1+(3+2) / 2×1=10.5Ah;

[0099] The detection time t (hour) of the discharge test process is 0, 1, 2, 3, and the corresponding adjustment current value Ii "(Ampere) is -4, -3, -2, -1, and the trapezoidal rule is used for approximate integration: Among them, n ’ is the number of data points (4 in this example), t ’ k is the moment of the kth data point, substituting the given data into the formula: C ’ i≈(-4+(-3)) / 2×1+(-3+(-2)) / 2×1+(-2+(-1)) / 2×1=7.5Ah;

[0100] Actual battery capacity = 1 / 2 × (10.5 + 7.5) = 9Ah.

[0101] Specifically, the embodiment of the present invention calculates any resistance change rate based on any of the adjusted resistance values ​​and the preset resistance value, wherein any resistance change rate = (Ri-R0) / R0, wherein Ri is any adjusted resistance value, R0 is the preset resistance value, and the actual resistance change rate is the average of several arbitrary resistance change rates.

[0102] Specifically, the preset battery capacity in the embodiment of the present invention is determined based on historical test data of the electrolyte battery;

[0103] The preset resistance value is the resistance value when the electrolyte battery is designed.

[0104] Specifically, the battery capacity attenuation rate described in the embodiment of the present invention = (preset battery capacity - actual battery capacity) / preset battery capacity.

[0105] Specifically, the performance determination subunit of the embodiment of the present invention includes determining that the constant temperature performance is poor when the battery capacity decay rate is greater than a preset capacity decay rate and the actual resistance change rate is greater than a preset resistance change rate;

[0106] When the battery capacity decay rate is less than or equal to a preset capacity decay rate or the actual resistance change rate is less than or equal to a preset resistance change rate, it is determined that the constant temperature performance is medium;

[0107] When the battery capacity decay rate is less than or equal to a preset capacity decay rate and the actual resistance change rate is less than or equal to a preset resistance change rate, it is determined that the constant temperature performance is excellent.

[0108] Specifically, the embodiment of the present invention can independently calculate the capacity and resistance change rate of the battery by setting the capacitance calculation subunit and the resistance calculation subunit, thereby making the battery performance evaluation more accurate. By introducing a preset battery capacity and a preset resistance value, a benchmark is provided for the battery performance evaluation, making the evaluation result more objective and consistent.

[0109] See also Figure 3 As shown, the variable temperature test module 50 includes:

[0110] A heating unit 51 is used to set a heating process according to a preset heating interval and the test temperature range, detect the heating current value and the heating resistance value corresponding to each heating test point of the variable temperature battery pack, draw a heating current change curve based on a plurality of heating current values, and draw a heating resistance change curve based on a plurality of heating resistance values;

[0111] The cooling unit 52 is used to set the cooling process according to the preset time interval and the test temperature range, detect the cooling current value and the cooling resistance value corresponding to the variable temperature battery pack at each cooling test point, draw a cooling current change curve based on a number of cooling current values, and draw a cooling resistance change curve based on a number of cooling resistance values.

[0112] Specifically, the heating process described in the embodiment of the present invention is from 60°C to 80°C, the preset temperature interval is 5°C, and several heating test points are 60°C, 65°C, 70°C, 75°C, and 80°C. The temperature is raised from 60°C to 65°C, and the heating current value and heating resistance value corresponding to the electrolyte battery at 65°C are detected. The temperature is raised from 65°C to 70°C, and the heating current value and heating resistance value corresponding to the electrolyte battery at 70°C are detected, so as to obtain several heating current values ​​and several heating resistance values ​​in the entire heating process. Similarly, the cooling process is from 80°C to 60°C, and several cooling test points are 80°C, 75°C, 70°C, 65°C, and 60°C. The temperature is reduced from 80°C to 75°C, and the cooling current value and cooling resistance value corresponding to the electrolyte battery at 75°C are detected, so as to obtain several cooling current values ​​and several cooling resistance values ​​in the entire cooling process.

[0113] Specifically, the embodiment of the present invention comprehensively evaluates the performance of the battery at different temperatures by setting the heating unit and the cooling unit, and observes the changing trends of the current and resistance of the battery during the gradual heating process through the heating current change curve and the heating resistance change curve, so as to analyze the stability and safety of the battery in a high temperature environment. Similarly, the performance of the battery during the gradual cooling process is evaluated through the cooling current change curve and the cooling resistance change curve.

[0114] See also Figure 4 As shown, the temperature change analysis module 60 includes:

[0115] A temperature rise determination unit 61, used to judge the temperature rise current change curve and the temperature rise resistance change curve respectively, determine the temperature rise current stability and the temperature rise resistance stability based on the judgment result, and determine the temperature rise stability based on the temperature rise current stability and the temperature rise resistance stability;

[0116] A cooling determination unit 62, configured to judge the cooling current change curve and the cooling resistance change curve respectively, determine the cooling current stability and the cooling resistance stability based on the judgment result, and determine the cooling stability based on the cooling current stability and the cooling resistance stability;

[0117] The temperature change determination unit 63 is connected to the temperature rise determination unit 61 and the temperature drop determination unit 62, and is used to adjust the preset temperature interval to obtain the adjusted temperature interval when the temperature rise stability is abnormal or the temperature drop stability is abnormal, re-detect and draw the change curve based on the adjusted temperature interval to determine the temperature rise stability and the temperature drop stability, and determine the temperature change performance of the electrolyte battery according to the temperature rise stability and the temperature drop stability.

[0118] Specifically, the adjustment unit in the embodiment of the present invention further includes:

[0119] When the temperature rise stability is abnormal and the temperature drop stability is abnormal, it is determined that the electrolyte battery has poor temperature change performance;

[0120] When both the temperature rising stability and the temperature falling stability are normal, it is determined that the electrolyte battery has excellent temperature changing performance.

[0121] Specifically, the embodiment of the present invention sets the temperature increase determination unit and the temperature decrease determination unit to perform a detailed analysis and evaluation on the performance of the battery at different temperatures, and judges the current and resistance stability of the battery in the gradual temperature increase process by observing and analyzing the temperature increase current change curve and the temperature increase resistance change curve, thereby evaluating the performance of the battery in a high temperature environment. Similarly, the performance of the battery in the gradual temperature decrease process is accurately evaluated through the temperature decrease current change curve and the temperature decrease resistance change curve. The temperature increase current change curve and the temperature increase resistance change curve are judged respectively by the temperature increase determination unit and the temperature decrease determination unit, and the stability of the current and resistance is determined by setting a series of thresholds.

[0122] Specifically, the temperature rise determination unit includes:

[0123] A current judgment subunit, used to judge the stability of the temperature-increasing current variation curve based on the slope value at each point on the temperature-increasing current variation curve, and obtain the temperature-increasing current stability;

[0124] A resistance judgment subunit, used to judge the stability of the temperature-increasing resistance change curve based on the slope value at each point on the temperature-increasing resistance change curve, and obtain the temperature-increasing resistance stability;

[0125] The temperature rise determination subunit is connected to the current judgment subunit and the temperature rise determination subunit, and is used to determine the temperature rise stability based on the temperature rise current stability and the temperature rise resistance stability.

[0126] Specifically, the temperature increase current variation curve described in the embodiment of the present invention is a variation curve drawn with the temperature value as the horizontal axis and the current value as the vertical axis;

[0127] The temperature-increasing resistance variation curve is a curve drawn with the temperature value as the horizontal axis and the resistance value as the vertical axis.

[0128] Specifically, the current judgment subunit described in the embodiment of the present invention is used to analyze the distribution ratio of several slope values ​​in a preset slope range. When the distribution ratio is greater than or equal to the preset ratio, it is judged that the heating current is stable; when the distribution ratio is less than the preset ratio, it is judged that the heating current is unstable.

[0129] The preset slope range is ±0.5 of the largest slope value among the slope values.

[0130] The default ratio is 90%.

[0131] Specifically, the resistance judgment subunit of the embodiment of the present invention is used to analyze the distribution ratio of a plurality of slope values ​​in a preset slope range, and when the distribution ratio is greater than or equal to the preset ratio, it is judged that the temperature-raising resistance is stable, and when the distribution ratio is less than the preset ratio, it is judged that the temperature-raising resistance is unstable;

[0132] The preset slope range is ±0.5 of the largest slope value among the slope values.

[0133] The default ratio is 90%.

[0134] Specifically, the temperature rise determination subunit of the embodiment of the present invention includes when the temperature rise current is stable and the temperature rise resistance is stable, the temperature rise is stable;

[0135] When the temperature-raising current is unstable or the temperature-raising resistance is unstable, the temperature-raising stability is abnormal.

[0136] Specifically, the adjustment unit includes:

[0137] a parameter calculation subunit, for calculating an adjustment parameter based on a degree of abnormality of the heating stability or a degree of abnormality of the cooling stability when the heating stability is abnormal or the cooling stability is abnormal;

[0138] The adjustment subunit is connected to the parameter calculation subunit and is used to adjust the preset temperature interval based on the adjustment parameter to obtain the adjusted temperature interval.

[0139] Specifically, the abnormal degree of temperature rise stability in the embodiment of the present invention includes a first difference between a distribution ratio corresponding to when the temperature rise resistance is judged to be unstable and a preset ratio and / or a second difference between a distribution ratio corresponding to when the temperature rise current is judged to be unstable and a preset ratio, and the first difference, the second difference or the product of the first difference and the second difference is used as an adjustment parameter;

[0140] The cooling stability abnormality includes a third difference between the corresponding distribution ratio when the cooling resistance is judged to be unstable and a preset ratio and / or a fourth difference between the corresponding distribution ratio when the cooling current is judged to be unstable and a preset ratio. The third difference, the fourth difference or the product of the third difference and the fourth difference is used as an adjustment parameter.

[0141] Specifically, the adjustment subunit described in the embodiment of the present invention includes: when the temperature rising stability is abnormal, reducing the preset temperature interval based on the adjustment parameter to obtain more detailed temperature control; when the temperature dropping stability is abnormal, increasing the preset temperature interval based on the adjustment parameter to obtain wider temperature control.

[0142] Specifically, the performance evaluation module is used to determine that when both the constant temperature performance and the variable temperature performance are poor, the comprehensive performance is poor, and when both the constant temperature performance and the variable temperature performance are excellent, the comprehensive performance is excellent.

[0143] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0144] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An ultra-high temperature electrolyte battery performance monitoring system, characterized in that: include: A battery division module, used to select a number of electrolyte batteries in the same electrolyte battery manufacturing batch as a test battery group, and divide the test battery group into a constant temperature battery group and a variable temperature battery group; A temperature division module is used to set a test temperature interval and set a number of test temperature points in the test temperature interval at preset temperature intervals; A constant temperature test module, connected to the temperature division module, for placing the constant temperature battery pack at a plurality of test temperature points for constant temperature charge and discharge test, and recording the constant temperature battery parameters of the electrolyte battery corresponding to each test temperature point in real time at a preset detection frequency; a constant temperature analysis module connected to the constant temperature test module, for analyzing the constant temperature battery parameters corresponding to any test temperature point, determining the actual abnormality of the constant temperature battery parameters based on the analysis results, comparing the actual abnormality with a preset abnormality interval, adjusting the preset detection frequency based on the comparison result to obtain a plurality of adjusted constant temperature battery parameters, and determining the constant temperature performance of the electrolyte battery based on the plurality of adjusted constant temperature battery parameters, or determining the poor constant temperature performance of the electrolyte battery corresponding to the current test temperature point; A variable temperature test module, connected to the temperature division module, for setting a temperature increase process according to a preset temperature interval and the test temperature interval, detecting the temperature increase battery parameters corresponding to each temperature increase test point of the variable temperature battery pack, and drawing a temperature increase parameter change curve based on a number of temperature increase battery parameters; setting a temperature decrease process according to the preset temperature interval and the test temperature interval, detecting the temperature decrease battery parameters corresponding to each temperature decrease test point of the variable temperature battery pack, and drawing a temperature decrease parameter change curve based on a number of temperature decrease battery parameters; a variable temperature analysis module, connected to the variable temperature test module, for analyzing the temperature rise parameter change curve and the temperature drop parameter change curve respectively, determining the temperature rise stability and the temperature drop stability of the electrolyte battery based on the analysis results, and when the temperature rise stability or the temperature drop stability is abnormal, adjusting the preset temperature interval and determining the variable temperature performance of the electrolyte battery; A performance evaluation module is connected to the constant temperature analysis module and the variable temperature analysis module, and is used to determine the comprehensive performance of the electrolyte battery based on the constant temperature performance and the variable temperature performance.

2. The ultra-high temperature electrolyte battery performance monitoring system according to claim 1, characterized in that: The constant temperature test module comprises: A testing unit, used to control the constant temperature battery pack to perform at least one constant temperature charge and discharge test at each test temperature point with a preset charge and discharge cycle; A data acquisition unit is connected to the test unit and is used to collect a number of test battery parameters during the charge and discharge test of any of the constant temperature battery packs at any of the test temperature points at a preset detection frequency, wherein the test battery parameters include a test current value and a test resistance value.

3. The ultra-high temperature electrolyte battery performance monitoring system according to claim 2, characterized in that: The constant temperature analysis module comprises: an identification unit, configured to identify an abnormal current value among the plurality of test current values, and to identify an abnormal resistance value among the plurality of test resistance values, and to determine the actual abnormality based on the abnormal current value and the abnormal resistance value, respectively; a comparison unit connected to the identification unit, for comparing the actual abnormality with a preset abnormality interval to determine whether a preset detection frequency needs to be adjusted; An adjustment unit connected to the comparison unit, for adjusting the preset detection frequency according to the comparison result, obtaining the adjusted detection frequency, and obtaining a number of adjusted current values ​​and a number of adjusted resistance values ​​corresponding to the electrolyte battery at any test temperature point according to the adjusted detection frequency; The analysis unit is connected to the adjustment unit, and is used to calculate the actual battery capacity based on the several adjustment current values, calculate the battery capacity decay rate based on the actual battery capacity, calculate the actual resistance change rate based on the several adjustment resistance values, and determine the constant temperature performance based on the battery capacity decay rate and the actual resistance change rate.

4. The ultra-high temperature electrolyte battery performance monitoring system according to claim 3, characterized in that: The identification unit comprises: A first calculation subunit is used to calculate a ratio of the abnormal number of the abnormal current values ​​to the total number of the test current values ​​as a first abnormal value; A second calculation subunit is used to calculate the ratio of the abnormal number of the abnormal resistance values ​​to the total number of the test resistance values ​​as a second abnormal value; The abnormality determination subunit is connected to the first calculation subunit and the second calculation subunit, and is used to calculate the actual abnormality degree based on the first abnormal value and the second abnormal value.

5. The ultra-high temperature electrolyte battery performance monitoring system according to claim 4, characterized in that: The analysis unit comprises: a capacitance calculation subunit, configured to determine a plurality of charging adjustment current values ​​in the charging process and a plurality of discharging adjustment current values ​​in the discharging process based on the charging and discharging test process, calculate the charging battery capacity based on the plurality of charging adjustment current values ​​and an ampere-hour integration algorithm, calculate the discharging battery capacity based on the plurality of discharging adjustment current values ​​and an ampere-hour integration algorithm, and determine the actual battery capacity based on the charging battery capacity and the discharging battery capacity; a capacity decay calculation subunit, connected to the capacitance calculation subunit, for calculating the battery capacity decay rate based on the actual battery capacity and the preset battery capacity; a resistance calculation subunit, configured to calculate the actual resistance change rate based on a plurality of the adjustment resistance values ​​and a preset resistance value; The performance determination subunit is connected to the capacitance calculation subunit and the resistance calculation subunit, and is used to determine the constant temperature performance based on the battery capacity decay rate and the actual resistance change rate.

6. The ultra-high temperature electrolyte battery performance monitoring system according to claim 5, characterized in that: The variable temperature test module comprises: A heating unit, used to set a heating process according to a preset heating interval and the test temperature range, detect a heating current value and a heating resistance value corresponding to each heating test point of the variable temperature battery pack, draw a heating current variation curve based on a plurality of heating current values, and draw a heating resistance variation curve based on a plurality of heating resistance values; A cooling unit is used to set a cooling process according to a preset time interval and the test temperature range, detect the cooling current value and the cooling resistance value corresponding to each cooling test point of the variable temperature battery pack, draw a cooling current change curve based on a number of cooling current values, and draw a cooling resistance change curve based on a number of cooling resistance values.

7. The ultra-high temperature electrolyte battery performance monitoring system according to claim 6, characterized in that: The variable temperature analysis module comprises: A temperature rise determination unit, used to judge the temperature rise current change curve and the temperature rise resistance change curve respectively, determine the temperature rise current stability and the temperature rise resistance stability based on the judgment results, and determine the temperature rise stability based on the temperature rise current stability and the temperature rise resistance stability; A temperature reduction determination unit, used to judge the temperature reduction current change curve and the temperature reduction resistance change curve respectively, determine the temperature reduction current stability and the temperature reduction resistance stability based on the judgment results, and determine the temperature reduction stability based on the temperature reduction current stability and the temperature reduction resistance stability; A temperature change determination unit is connected to the temperature rise determination unit and the temperature drop determination unit, and is used to adjust the preset temperature interval to obtain an adjusted temperature interval when the temperature rise stability is abnormal or the temperature drop stability is abnormal, re-detect and draw a change curve based on the adjusted temperature interval to determine the temperature rise stability and the temperature drop stability, and determine the temperature change performance of the electrolyte battery according to the temperature rise stability and the temperature drop stability.

8. The ultra-high temperature electrolyte battery performance monitoring system according to claim 7, characterized in that: The temperature rise determination unit comprises: A current judgment subunit, used to judge the stability of the temperature-increasing current variation curve based on the slope value at each point on the temperature-increasing current variation curve, and obtain the temperature-increasing current stability; A resistance judgment subunit, used to judge the stability of the temperature-increasing resistance change curve based on the slope value at each point on the temperature-increasing resistance change curve, and obtain the temperature-increasing resistance stability; The temperature rise determination subunit is connected to the current judgment subunit and the temperature rise determination subunit, and is used to determine the temperature rise stability based on the temperature rise current stability and the temperature rise resistance stability.

9. The ultra-high temperature electrolyte battery performance monitoring system according to claim 8, characterized in that: The adjustment unit comprises: a parameter calculation subunit, for calculating an adjustment parameter based on a degree of abnormality of the heating stability or a degree of abnormality of the cooling stability when the heating stability is abnormal or the cooling stability is abnormal; The adjustment subunit is connected to the parameter calculation subunit and is used to adjust the preset temperature interval based on the adjustment parameter to obtain the adjusted temperature interval.

10. The ultra-high temperature electrolyte battery performance monitoring system according to claim 9, characterized in that: The performance evaluation module is used to determine that when both the constant temperature performance and the variable temperature performance are poor, the comprehensive performance is poor, and when both the constant temperature performance and the variable temperature performance are excellent, the comprehensive performance is excellent.

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