CN117452273B - Battery charge-discharge performance test system for simulating actual use process - Google Patents
Battery charge-discharge performance test system for simulating actual use process Download PDFInfo
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- 238000011056 performance test Methods 0.000 title claims abstract description 15
- 238000004088 simulation Methods 0.000 claims abstract description 76
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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Abstract
The application discloses a battery charge and discharge performance test system for simulating an actual use process, and belongs to the technical field of battery tests. The system comprises a demand configuration module, a test control module, an environment simulation module and a performance evaluation module. The demand configuration module is used for collecting demand information of the base station. The demand information comprises a simulation test parameter set, standby power demand information and peak clipping demand information. The test control module is used for controlling the environment simulation module to execute a test strategy and monitoring the electrical performance parameters of the battery according to the demand information. The environment simulation module comprises a temperature and humidity control module, a load simulation module and a charging module. The performance evaluation module evaluates the battery performance according to the electrical performance parameters. The application collects the real use environment and the demand and simulates the actual application process, thereby judging whether the battery performance accords with the long-term standby power demand and peak clipping demand of the base station; and by monitoring the change of the voltage threshold corresponding to the consumption capacity, the battery management strategy of the base station is facilitated to be optimized.
Description
Technical Field
The invention relates to the technical field of battery testing, in particular to a battery charging and discharging performance testing system for simulating an actual use process.
Background
Communication base stations typically require a continuous uninterrupted power supply to ensure the reliability of the communication services. To cope with grid faults or other power interruption situations, the base station is usually equipped with a backup battery, which is able to supply power immediately upon failure of the main power supply. In addition, the standby battery equipped in the base station is also used for reducing the power supply peak value, namely, the base station uses the battery to supply power in the period of peak power demand, so that the load of a power grid is reduced, and the use of electric energy is optimized. During actual use of the battery, the degradation of the battery performance can affect its power backup and peak clipping capabilities. Therefore, it is necessary to ensure that the battery meets the performance requirements of the base station over a predetermined lifetime by performing a comprehensive and careful test of the battery performance before the backup battery is put into use in the base station.
Currently, due to the large differences in the technology type, use environment, and manner of use of batteries, existing battery test systems typically perform conventional standard charge and discharge cycles in a controlled laboratory environment, which may not fully reproduce the use environment and manner of use in actual operation of the communication base station. This results in a test result that may be too idealized to accurately reflect the performance and life of the battery in a real use scenario. Such differences may result in test results that do not meet the actual needs of the base station and it is also difficult to provide decision support for battery life management of the base station.
Disclosure of Invention
In order to solve the problems in the background technology, the invention adopts the following technical scheme:
A battery charge and discharge performance test system for simulating actual use process comprises a demand configuration module, a test control module, an environment simulation module and a performance evaluation module;
The demand configuration module is used for collecting demand information of the base station; the demand information comprises a simulation test parameter set, standby power demand information and peak clipping demand information; the standby power demand information comprises important main equipment power, secondary main equipment power, first-stage operation duration, second-stage operation duration and standby power operation times; the peak clipping requirement information comprises important main equipment power, secondary main equipment power, single peak clipping time length and peak clipping operation times;
The test control module is used for controlling the environment simulation module to execute a test strategy according to the demand information, and simultaneously monitoring the electrical performance parameters of the battery and sending the electrical performance parameters to the performance evaluation module;
the environment simulation module comprises a temperature and humidity control module, a load simulation module and a charging module; the temperature and humidity control module is used for simulating the temperature and humidity of the environment; the charging module is used for charging the battery; the load simulation module comprises a first simulation load and a second simulation load, wherein the first simulation load is used for simulating a secondary main device of the base station, and the second simulation load is used for simulating an important main device of the base station;
The performance evaluation module evaluates the performance of the battery according to the electrical performance parameters;
the test strategy comprises the following steps:
s1, calculating a first capacity consumption value and a second capacity consumption value according to standby power demand information; calculating a third capacity consumption value according to the peak clipping requirement information;
S2, setting working parameters of an environment simulation module according to the simulation test parameter set;
s3, repeatedly executing the cyclic charge and discharge test according to the first capacity consumption value, the second capacity consumption value and the third capacity consumption value until the execution times reach a preset time threshold; and continuously monitoring the electrical performance parameters of the battery in the cyclic charge and discharge test process.
As a preferred embodiment of the present application, the cyclic charge and discharge test includes the steps of:
S41, charging the battery until the terminal voltage reaches the upper limit cut-off voltage, electrically connecting the battery with the first analog load and the second analog load, and discharging the battery;
S42, when the capacity consumption value of the battery reaches a first capacity consumption value, the load simulation module cuts off the first simulation load, and records the battery terminal voltage value at the moment as a first terminal voltage threshold value;
s43, when the capacity consumption value of the battery reaches a second capacity consumption value, the load simulation module cuts off a second simulation load, and records the battery terminal voltage value at the moment as a second terminal voltage threshold value;
calculating the current capacity of the battery, if the current capacity is lower than 30% of the rated capacity, judging that the battery does not meet the standby power demand, and ending the cyclic charge and discharge test;
s44, charging the battery until the terminal voltage reaches the upper limit cut-off voltage, connecting the battery with the first analog load and the second analog load, and discharging the battery;
S45, when the capacity consumption value of the battery reaches a third capacity consumption value, the load simulation module cuts off the first simulation load and the second simulation load, and records the battery terminal voltage value at the moment as a third terminal voltage threshold value;
and calculating the current capacity of the battery, if the current capacity is lower than 30% of the rated capacity, judging that the battery does not meet the peak clipping requirement, and ending the cyclic charge and discharge test.
As a preferred embodiment of the present application, the calculating the current capacity of the battery specifically includes:
Continuously reading the discharge current of the battery, and calculating a discharge current integral value from the start time to the discharge end time of the current step; the discharge end time is a time when the voltage is reduced to a lower limit cut-off voltage.
As a preferred embodiment of the present application, the preset number of times threshold is expressed as:
Wherein T is a preset frequency threshold; mu is a preset frequency safety coefficient; t 1 is the standby operation times, and T 2 is the peak clipping operation times.
As a preferable scheme of the application, the environment simulation module further comprises an internal resistance tester; the electrical performance parameters also include an ac internal resistance; the cycle charge and discharge test is performed once every ten cycles to measure the ac internal resistance of the battery, and the step S41 specifically includes the steps of:
s411, charging the battery until the terminal voltage reaches the upper limit cut-off voltage, disconnecting the battery from the charging module, and ensuring that the battery is in a static state before testing so as to reduce measurement errors;
s412, connecting the battery with an internal resistance tester, acquiring alternating current internal resistance and transmitting the alternating current internal resistance to a performance evaluation module;
and S413, electrically connecting the battery with the first analog load and the second analog load, and discharging the battery.
As a preferred embodiment of the present application, the first capacity consumption value is expressed as:
Wherein Δq 1 is the first capacity consumption value; k is a preset capacity safety coefficient; beta is a temperature correction coefficient; p 1 is the secondary master power; p 2 is the important master power; t 1 is the first stage operation duration; u is the standard discharge voltage of the battery;
The second capacity consumption value is expressed as:
Wherein Δq 2 is the second capacity consumption value; t 2 is the second stage run length.
As a preferred embodiment of the present application, the third capacity consumption value is expressed as:
wherein Δq 3 is the third capacity consumption value; t 3 is the single peak clipping time length.
As a preferred embodiment of the present application, the step S2 specifically includes: setting working parameters of the environment simulation module and a change mode of the working parameters according to the simulation test parameter set; the change mode is used for adjusting working parameters in the cyclic charge and discharge test process; the change modes include a continuous change mode, a regular mutation mode, a random mutation mode and a phase change mode.
As a preferable scheme of the application, the performance evaluation module fits a change curve according to the electrical performance parameters and calculates key performance indexes.
As a preferable scheme of the application, the change curve comprises a charging curve, a discharging curve, a capacity change curve and an internal resistance change curve; the key performance indicators include charge efficiency, energy density, SOH indicator, and discharge stability.
Compared with the prior art, the invention has the following beneficial effects:
The battery charge and discharge performance test system collects real use environments and requirements through the requirement configuration module, simulates an actual application process according to the use environment simulation module, and judges whether the battery performance meets long-term standby power requirements and peak clipping requirements of a base station by acquiring battery capacity in the use process; in addition, as the battery ages, the battery capacity and the voltage curve can change, so the application continuously monitors the change of the voltage threshold corresponding to the consumption capacity, so as to know the influence of the battery aging on the voltage threshold, provide accurate reference data for the actual use of the standby battery by the base station, and be beneficial to optimizing the battery management strategy of the base station.
On the basis that the test strategy has the condition of judging whether the battery capacity meets the long-term use requirement of the base station, the performance evaluation module analyzes and processes the electrical performance parameters, evaluates the battery performance through the change curve and the key performance index, further ensures the reliability of the standby battery, and provides important decision support for the selection and maintenance of the standby battery of the base station.
According to the application, the cyclic charge and discharge test of the battery can be performed in an environment which is closer to an actual use scene or an extreme use scene by setting the change mode of the working parameters of the environment simulation module; the test result can more accurately reflect the performance of the battery in practical application, and is helpful for finding out defects of design and enhancing the reliability of the test result.
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In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a battery charge/discharge performance test system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a testing strategy according to an embodiment of the invention;
Fig. 3 is a schematic flow chart of a cyclic charge-discharge test according to an embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The actual use process of the standby battery of the communication base station comprises the following steps:
First stage of standby battery: when the mains supply fails or is interrupted to stop the primary power supply, the power centralized management unit of the base station starts a standby battery, and the standby battery discharges to provide emergency power so as to support the normal operation of the important main equipment and the secondary main equipment.
The second stage of the standby battery (i.e. one power down): when the voltage of the standby battery terminal is lower than the first terminal voltage threshold value, the power centralized management unit of the base station disconnects the secondary main equipment, and the standby battery continuously supports the normal operation of the important main equipment. This stage saves power resources by disconnecting power to the secondary master, ensuring that the remaining battery energy heavy point is used to support continued operation of the important master. This strategy helps to maintain the runtime of the most core functions of the base station, thereby maintaining critical services such as emergency communication.
Third stage of standby battery (i.e. secondary power down): when the voltage of the standby battery is lower than the voltage threshold of the second terminal, the power centralized management unit of the base station disconnects the important main equipment, and the standby battery stops discharging and enters a charging state. Wherein the second terminal voltage threshold is less than the first terminal voltage threshold. In this stage, as the backup battery continues to discharge, the battery terminal voltage drops further if the utility power is not restored and the battery power is further reduced. When the voltage is lower than the voltage threshold of the second end, even the important main equipment is disconnected from the power supply, the discharging is stopped comprehensively, the damage caused by the excessive discharging of the battery is avoided, the service life of the battery is prolonged, and meanwhile, the base station is kept in a ready state for the quick restarting of the commercial power after the recovery.
In addition, the standby battery of the communication base station is also used for responding to the peak clipping requirement of the power supply unit, and the actual using process for realizing the peak clipping requirement is specifically as follows:
when the peak clipping requirement is started, the power centralized management unit of the base station actively cuts off the commercial power, starts the standby battery, and discharges the standby battery to provide emergency power so as to support the normal operation of the important main equipment and the secondary main equipment.
When the voltage of the standby battery is lower than the voltage threshold of the third terminal, the power centralized management unit of the base station disconnects the important main equipment and the secondary main equipment, and the standby battery stops discharging and enters a charging state so as to prevent damage caused by overdischarge of the battery and prolong the service life of the battery. It should be noted that the third terminal voltage threshold is not necessarily related to the setting of the first terminal voltage threshold and the second terminal voltage threshold.
Referring to fig. 1, the invention provides a battery charge and discharge performance test system for simulating an actual use process, which comprises a demand configuration module, a test control module, an environment simulation module and a performance evaluation module.
The test control module is respectively in communication connection with the demand configuration module, the environment simulation module and the performance evaluation module.
The demand configuration module is used for collecting demand information of the base station. The demand information comprises a simulation test parameter set, standby power demand information and peak clipping demand information. Specifically, the standby power demand information includes important main equipment power, secondary main equipment power, first-stage operation duration, second-stage operation duration and standby power operation times. The peak clipping requirement information comprises important main equipment power, secondary main equipment power, single peak clipping time length and peak clipping operation times.
The test control module is used for controlling the environment simulation module to execute a test strategy according to the demand information, and simultaneously monitoring the electrical performance parameters of the battery and sending the electrical performance parameters to the performance evaluation module. And the test strategy judges whether the battery capacity meets the standby power requirement and peak clipping requirement of the base station for long-term use in a mode of actually measuring the consumed capacity.
The environment simulation module comprises a temperature and humidity control module, a load simulation module and a charging module. And the temperature and humidity control module simulates the ambient temperature and humidity. The charging module is used for charging the battery. The load simulation module comprises a first simulation load and a second simulation load, wherein the first simulation load is used for simulating a secondary main device of the base station, and the second simulation load is used for simulating an important main device of the base station.
The performance evaluation module evaluates the battery performance according to the electrical performance parameters.
The battery charge and discharge performance test system collects real use environments and requirements through the requirement configuration module, and simulates an actual application process according to the use environment simulation module, so that the performance of the battery in an actual working environment is accurately tested through a test strategy. On the basis that the test strategy already has the condition of judging whether the battery capacity meets the long-term use requirement of the base station, the performance evaluation module analyzes and processes the electrical performance parameters and evaluates the battery performance, so that the reliability of the standby battery is further ensured, and the base station can be guided to select the standby battery.
Based on the actual usage process of the backup battery, please refer to fig. 2, the testing strategy includes the steps of:
S1, calculating a first capacity consumption value and a second capacity consumption value according to standby power demand information; and calculating a third capacity consumption value according to the peak clipping requirement information.
Specifically, the first capacity consumption value is expressed as:
Wherein Δq 1 is the first capacity consumption value; k is a preset capacity safety coefficient, and in one embodiment, the value is 1.2; beta is a temperature correction coefficient, and the average temperature parameter setting of the working environment of the base station is calculated through simulating a test parameter set, wherein the value range is [1,1.5] in one embodiment, and the lower the working environment temperature is, the higher the temperature correction coefficient is; p 1 is the secondary master power; p 2 is the important master power; t 1 is the first stage operation duration; u is the standard discharge voltage of the battery.
The second capacity consumption value is expressed as:
Wherein Δq 2 is the second capacity consumption value; t 2 is the second stage run length.
The third capacity consumption value is expressed as:
wherein Δq 3 is the third capacity consumption value; t 3 is the single peak clipping time length.
S2, setting working parameters of the environment simulation module according to the simulation test parameter set. The working parameters comprise ambient temperature and humidity, first analog load power, second analog load power, charging current and voltage and the like.
S3, repeatedly executing the cyclic charge and discharge test according to the first capacity consumption value, the second capacity consumption value and the third capacity consumption value until the execution times reach a preset time threshold; and continuously monitoring the electrical performance parameters of the battery in the cyclic charge and discharge test process. The electrical performance parameters include at least a first terminal voltage threshold, a second terminal voltage threshold, a terminal voltage, a discharge current, a capacity, and a temperature.
Further, referring to fig. 3, the cyclic charge and discharge test includes the steps of:
And S41, charging the battery until the terminal voltage reaches the upper limit cut-off voltage, and then electrically connecting the battery with the first analog load and the second analog load to discharge the battery.
S42, when the capacity consumption value of the battery reaches a first capacity consumption value, the load simulation module cuts off the first simulation load, and records the battery terminal voltage value at the moment as a first terminal voltage threshold value;
and S43, when the capacity consumption value of the battery reaches a second capacity consumption value, the load simulation module cuts off the second simulation load, and records the battery terminal voltage value at the moment as a second terminal voltage threshold value.
And calculating the current capacity of the battery, if the current capacity is lower than 30% of the rated capacity, judging that the battery does not meet the standby power demand, and ending the cyclic charge and discharge test.
And S44, charging the battery until the terminal voltage reaches the upper limit cut-off voltage, connecting the battery with the first analog load and the second analog load, and discharging the battery.
And S45, when the capacity consumption value of the battery reaches a third capacity consumption value, the load simulation module cuts off the first simulation load and the second simulation load, and records the battery terminal voltage value at the moment as a third terminal voltage threshold value.
And calculating the current capacity of the battery, if the current capacity is lower than 30% of the rated capacity, judging that the battery does not meet the peak clipping requirement, and ending the cyclic charge and discharge test.
Further, the calculating the current capacity of the battery specifically includes:
Continuously reading the discharge current of the battery, and calculating a discharge current integral value from the start time to the discharge end time of the current step; the discharge end time is a time when the voltage is reduced to a lower limit cut-off voltage.
The cyclic charge and discharge test simulates the actual use process of the standby battery, and judges whether the battery performance meets the long-term standby power requirement and peak clipping requirement of the base station by acquiring the battery capacity in the use process; in addition, as the battery ages, the battery capacity and voltage curve can change, so the application continuously monitors the changes of the first voltage threshold, the second voltage threshold and the third voltage threshold to know the influence of the battery aging on the voltage threshold, provides accurate reference data for the actual use of the standby battery by the base station, and is beneficial to optimizing the battery management strategy of the base station.
Further, in this embodiment, the preset number of times threshold is expressed as:
Wherein T is a preset frequency threshold; μ is a predetermined number of times safety factor, 1.5 in one embodiment; t 1 is the standby operation times, and T 2 is the peak clipping operation times.
As a preferred embodiment, the step S2 specifically includes: setting the working parameters of the environment simulation module and the change modes of the working parameters according to the simulation test parameter set.
The change mode is used for adjusting working parameters in the cyclic charge and discharge test process. The change modes include a continuous change mode, a regular mutation mode, a random mutation mode and a phase change mode.
Wherein for a continuous variation mode, parameters such as temperature and humidity can be continuously varied over time in a linear or non-linear manner to simulate gradual or seasonal changes in the natural environment. For regular and random patterns of abrupt changes, the parameters may be changed rapidly to a new value to simulate rapid environmental changes caused by abnormal conditions, such as rapid switching of the parameters between a minimum, standard and maximum value. The difference between the regular mutation mode and the random mutation mode is that the change curve of the parameter value set by the regular mutation mode is monotonically increasing or monotonically decreasing, and the parameter value set by the random mutation mode is randomly selected according to the selection probability corresponding to the preset parameter value. For a stepwise change pattern, the charging current and voltage may be changed according to different charging phases (e.g. constant current phase, constant voltage phase, trickle charging phase). The conversion range of the parameters is set according to the simulation test parameter set.
The arrangement of these changing modes allows the cyclic charge and discharge test of the battery to be performed in an environment closer to the actual use scenario or the extreme use scenario. The test result can more accurately reflect the performance of the battery in practical application, and is helpful for finding out defects of design and enhancing the reliability of the test result.
As a preferred embodiment, the cyclic charge-discharge test further comprises measuring the ac internal resistance of the battery. Because the alternating current excitation can cause dynamic electrochemical reaction inside the battery, the alternating current internal resistance is related to the electrochemical dynamic characteristics of the battery, and can reflect the comprehensive performance of the battery to a certain extent than the direct current internal resistance, and the higher internal resistance can cause larger energy loss and heating to influence the working efficiency of the battery. As the battery ages, its internal resistance tends to increase due to problems such as electrolyte degradation, electrode corrosion, and the like.
Specifically, the environment simulation module further comprises an internal resistance tester. The electrical performance parameters also include an ac internal resistance. The cycle charge and discharge test is performed once every ten cycles to measure the ac internal resistance of the battery, and the step S41 specifically includes the steps of:
s411, charging the battery until the terminal voltage reaches the upper limit cut-off voltage, disconnecting the battery from the charging module, and ensuring that the battery is in a static state before testing so as to reduce measurement errors;
s412, connecting the battery with an internal resistance tester, acquiring alternating current internal resistance and transmitting the alternating current internal resistance to a performance evaluation module;
and S413, electrically connecting the battery with the first analog load and the second analog load, and discharging the battery.
According to the embodiment, the aging process of the battery can be monitored by periodically measuring the alternating current internal resistance of the battery, and the aging process can be used as a basis for predicting the residual service life of the battery.
As a preferred embodiment, the performance evaluation module fits a change curve of the electrical performance parameter according to the electrical performance parameter, calculates a key performance index, and evaluates the performance of the battery according to the change curve and the key performance index. The change curve of the electrical performance parameter comprises a charging curve, a discharging curve, a capacity change curve and an internal resistance change curve. The key performance indicators include charge efficiency, energy density, SOH indicator, and discharge stability.
The internal resistance change curve represents the condition that the internal resistance of the battery changes along with time and cycle times. The increase in internal resistance affects the charge efficiency and energy density of the battery, while affecting the discharge stability of the battery under high load.
The capacity change curve characterizes the decay of the battery with increasing capacity over time and cycle number. According to the capacity change curve, the maximum charge capacity recorded in each charge-discharge cycle is compared with the original capacity, and the change is calculated to reflect the aging rate of the battery.
The charging efficiency refers to the ratio of the amount of electricity charged into the battery to the amount of electricity stored during actual charging. This index is related to the loss of energy, including irreversible loss of electrochemical reactions inside the cell and other heat losses. The charge curve shows the increase in battery terminal voltage over time, while the discharge curve may inversely reflect the release of electrical energy during discharge. The charge efficiency can be calculated by comparing the time and the capacity spent by both.
The energy density refers to the energy that a cell per unit mass can store. The energy density can be calculated from the discharge curve, and the total amount of energy released during the entire discharge is calculated by integrating the area under the discharge curve, divided by the weight of the battery.
Discharge stability refers to an indicator of the stability of the battery output during discharge. The discharge curve shows the change of the battery voltage along with time, the stability of discharge is determined by the stability degree of voltage output, and the voltage does not fluctuate greatly.
The SOH index is used to directly describe the battery health, representing the percentage of current battery performance versus performance when new. The SOH includes an SOH capacity index and an SOH internal resistance index.
The SOH capacity index is expressed as:
Wherein, C EoL is the capacity value of the battery life end time, C BoL is the capacity value of the new battery, and C is the actual battery capacity value at the current time.
The SOH internal resistance index is expressed as:
Wherein, R EoL is the internal resistance value of the battery life end time, R BoL is the internal resistance value of the new battery, and R is the actual internal resistance value of the battery at the current moment.
The change curve and the key performance index can help to know the working efficiency, the aging speed and the power characteristics of the battery in practical application, thereby providing important decision support for the selection and maintenance of the standby battery of the base station.
In the several embodiments provided by the present application, it should be understood that the disclosed systems and methods may be implemented in other ways. For example, the system embodiments described above are merely illustrative, e.g., the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection of modules, electrical, mechanical, or other forms.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated modules may be implemented in hardware or in software functional modules.
The integrated modules, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random-access memory (RAM, random access memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Claims (7)
1. A battery charge and discharge performance test system simulating actual use process is characterized in that: the system comprises a demand configuration module, a test control module, an environment simulation module and a performance evaluation module;
The demand configuration module is used for collecting demand information of the base station; the demand information comprises a simulation test parameter set, standby power demand information and peak clipping demand information; the standby power demand information comprises important main equipment power, secondary main equipment power, first-stage operation duration, second-stage operation duration and standby power operation times; the peak clipping requirement information comprises important main equipment power, secondary main equipment power, single peak clipping time length and peak clipping operation times;
The test control module is used for controlling the environment simulation module to execute a test strategy according to the demand information, and simultaneously monitoring the electrical performance parameters of the battery and sending the electrical performance parameters to the performance evaluation module;
the environment simulation module comprises a temperature and humidity control module, a load simulation module and a charging module; the temperature and humidity control module is used for simulating the temperature and humidity of the environment; the charging module is used for charging the battery; the load simulation module comprises a first simulation load and a second simulation load, wherein the first simulation load is used for simulating a secondary main device of the base station, and the second simulation load is used for simulating an important main device of the base station;
The performance evaluation module evaluates the performance of the battery according to the electrical performance parameters;
the test strategy comprises the following steps:
s1, calculating a first capacity consumption value and a second capacity consumption value according to standby power demand information; calculating a third capacity consumption value according to the peak clipping requirement information;
S2, setting working parameters of an environment simulation module according to the simulation test parameter set;
S3, repeatedly executing the cyclic charge and discharge test according to the first capacity consumption value, the second capacity consumption value and the third capacity consumption value until the execution times reach a preset time threshold; continuously monitoring the electrical performance parameters of the battery in the cyclic charge and discharge test process;
The cyclic charge and discharge test comprises the following steps:
S41, charging the battery until the terminal voltage reaches the upper limit cut-off voltage, electrically connecting the battery with the first analog load and the second analog load, and discharging the battery;
S42, when the capacity consumption value of the battery reaches a first capacity consumption value, the load simulation module cuts off the first simulation load, and records the battery terminal voltage value at the moment as a first terminal voltage threshold value;
s43, when the capacity consumption value of the battery reaches a second capacity consumption value, the load simulation module cuts off a second simulation load, and records the battery terminal voltage value at the moment as a second terminal voltage threshold value;
calculating the current capacity of the battery, if the current capacity is lower than 30% of the rated capacity, judging that the battery does not meet the standby power demand, and ending the cyclic charge and discharge test;
s44, charging the battery until the terminal voltage reaches the upper limit cut-off voltage, connecting the battery with the first analog load and the second analog load, and discharging the battery;
S45, when the capacity consumption value of the battery reaches a third capacity consumption value, the load simulation module cuts off the first simulation load and the second simulation load, and records the battery terminal voltage value at the moment as a third terminal voltage threshold value;
Calculating the current capacity of the battery, if the current capacity is lower than 30% of the rated capacity, judging that the battery does not meet the peak clipping requirement, and ending the cyclic charge and discharge test;
The first capacity consumption value is expressed as:
；
wherein, Is a first capacity consumption value; k is a preset capacity safety coefficient; /(I)Is a temperature correction coefficient; /(I)Power for the secondary master; /(I)Is an important master power; /(I)The first stage operation time length; /(I)Is the standard discharge voltage of the battery;
The second capacity consumption value is expressed as:
；
wherein, Is a second capacity consumption value; /(I)The second stage operation time length;
The third capacity consumption value is expressed as:
；
wherein, A third capacity consumption value; /(I)Is the single peak clipping time length.
2. The battery charge-discharge performance test system simulating actual use according to claim 1, wherein: the method comprises the following steps of calculating the current capacity of the battery:
Continuously reading the discharge current of the battery, and calculating a discharge current integral value from the start time to the discharge end time of the current step; the discharge end time is a time when the voltage is reduced to a lower limit cut-off voltage.
3. The battery charge-discharge performance test system simulating actual use according to claim 1, wherein: the preset times threshold is expressed as:
；
Wherein T is a preset frequency threshold; The safety coefficient is a preset frequency safety coefficient; t 1 is the standby operation times, and T 2 is the peak clipping operation times.
4. The battery charge-discharge performance test system simulating actual use according to claim 1, wherein: the environment simulation module further comprises an internal resistance tester; the electrical performance parameters also include an ac internal resistance; the cycle charge and discharge test is performed once every ten cycles to measure the ac internal resistance of the battery, and the step S41 specifically includes the steps of:
s411, charging the battery until the terminal voltage reaches the upper limit cut-off voltage, disconnecting the battery from the charging module, and ensuring that the battery is in a static state before testing so as to reduce measurement errors;
s412, connecting the battery with an internal resistance tester, acquiring alternating current internal resistance and transmitting the alternating current internal resistance to a performance evaluation module;
and S413, electrically connecting the battery with the first analog load and the second analog load, and discharging the battery.
5. The battery charge-discharge performance test system simulating actual use according to claim 1, wherein: the step S2 specifically comprises the following steps: setting working parameters of the environment simulation module and a change mode of the working parameters according to the simulation test parameter set; the change mode is used for adjusting working parameters in the cyclic charge and discharge test process; the change modes include a continuous change mode, a regular mutation mode, a random mutation mode and a phase change mode.
6. The battery charge-discharge performance test system simulating actual use according to claim 1, wherein: and the performance evaluation module fits a change curve according to the electrical performance parameters and calculates key performance indexes.
7. The battery charge and discharge performance test system simulating actual use according to claim 6, wherein: the change curves comprise a charging curve, a discharging curve, a capacity change curve and an internal resistance change curve; the key performance indicators include charge efficiency, energy density, SOH indicator, and discharge stability.
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