CN112540307A - Military power battery charging and discharging performance test system - Google Patents
Military power battery charging and discharging performance test system Download PDFInfo
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- CN112540307A CN112540307A CN202011378479.4A CN202011378479A CN112540307A CN 112540307 A CN112540307 A CN 112540307A CN 202011378479 A CN202011378479 A CN 202011378479A CN 112540307 A CN112540307 A CN 112540307A
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- 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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a system and a method for testing charge and discharge performance of a military power battery, belonging to the technical field of battery testing, wherein the system comprises: the computer is used for generating a charging and discharging switching instruction, a charging mode instruction, a discharging mode instruction and a data acquisition instruction; the data processing card is used for sending the charging and discharging switching instruction to the charging and discharging control unit and acquiring and uploading the sensing signal from the sensing test unit to a computer after receiving the data acquisition instruction; the sensing test unit is used for measuring a sensing signal of the power battery to be tested; and the charge and discharge control unit is used for executing the charge and discharge switching instruction, the charge mode instruction and the discharge mode instruction and controlling the charge mode and the discharge mode of the tested power battery. The invention can complete various test modes such as constant current charging, constant current discharging, constant voltage charging, constant voltage discharging test, comprehensive complex test and the like according to the requirements of users, thereby realizing automatic test.
Description
Technical Field
The invention belongs to the technical field of storage battery charging and discharging tests, and particularly relates to a military power battery charging and discharging performance test system.
Background
The power battery belongs to a storage battery, has the characteristics of high energy storage density, high power, wide working temperature range and long expected service life, is widely applied to various handheld devices, electric vehicles and aerospace vehicles, particularly in the field of national defense and military industry, and is used as a basic power supply unit in large quantity, and the performance and safety indexes of the power battery directly relate to the quality and safety of weaponry. The remaining capacity, expected service life, consistency differences, charge and discharge performance, etc. of the power battery all have an impact on the reliability of the equipment.
In the process of testing the charging and discharging of the power battery, the performance of the battery needs to be tested under various working conditions to judge whether the battery is qualified, so that the test equipment needs to be frequently switched and the test parameters need to be adjusted. The existing battery charging and discharging test system generally has the defects of single function, low automation degree, incapability of being used under multiple working conditions, low working efficiency, heavy volume, difficulty in transition and the like, and is difficult to meet the increasing requirement of updating and upgrading weaponry.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a test system for the charge and discharge performance of a military power battery, which is used for solving the problems of low degree of functional automation, low working efficiency, high requirement on the technical level of testers, complex operation, long time consumption, heavy volume, difficulty in transition and the like of the conventional test system.
A military power battery charge and discharge performance test system comprises: the device comprises a computer, a data processing card, a sensing test unit and a charging and discharging control unit; wherein the content of the first and second substances,
the computer is used for generating a charging and discharging switching instruction, a charging mode instruction, a discharging mode instruction and a data acquisition instruction; the discharge mode instruction comprises a constant-current discharge mode instruction, a constant-voltage discharge mode instruction and a constant-power discharge mode instruction;
the data processing card is used for issuing the charging and discharging switching instruction to the charging and discharging control unit and acquiring and uploading the sensing signal from the sensing test unit to a computer after receiving the data acquisition instruction;
the sensing test unit is used for measuring a sensing signal of the power battery to be tested;
and the charge and discharge control unit is used for executing the charge and discharge switching instruction, the charge mode instruction and the discharge mode instruction and controlling the charge mode and the discharge mode of the tested power battery.
Further, the charging and discharging control unit comprises a charging and discharging switching control circuit, a direct current stabilized power supply and a direct current electronic load; wherein the content of the first and second substances,
the charging and discharging switching control circuit is used for executing a charging and discharging switching instruction from the data acquisition card and switching a charging and discharging mode;
the direct current stabilized voltage supply is a programmable direct current stabilized voltage supply and is used for executing a charging mode instruction from the computer and providing charging power under a charging mode for the tested power battery;
the direct current electronic load is a programmable direct current electronic load and is used for executing a discharging mode instruction from the computer and providing a discharging load in a discharging mode for the tested power battery.
Furthermore, the charge-discharge switching control circuit comprises a first relay drive circuit, a second relay drive circuit, a third relay drive circuit and a fourth relay drive circuit, wherein each relay drive circuit controls one relay;
two ends of the first relay driving circuit are respectively connected with the anode of the direct current stabilized power supply and the anode of the direct current electronic load; two ends of the second relay driving circuit are respectively connected with the positive electrode of the direct current electronic load and the positive electrode test terminal of the power battery to be tested; two ends of the third relay driving circuit are respectively connected with the negative electrode of the direct-current stabilized power supply and the negative electrode of the direct-current electronic load, and the negative electrode of the direct-current stabilized power supply is also connected with a negative electrode test terminal of the power battery to be tested; two ends of the fourth relay driving circuit are respectively connected with the negative electrode of the direct current electronic load and the positive electrode test terminal of the power battery to be tested; and the control ends of the 4 relay drive circuits are connected with a data acquisition card respectively.
The direct current stabilized power supply regulates charging voltage and charging current based on the charging mode instruction; the charging mode instruction comprises a power supply starting instruction, a power supply closing instruction, a charging current value setting value, a charging voltage value, an output starting instruction and an output stopping instruction.
The direct-current stabilized power supply controls the operation and the closing of a direct-current stabilized power supply circuit based on the power starting instruction and the power closing instruction, adjusts the charging voltage and the charging current based on the set charging current value and the set charging voltage value, and controls the direct-current stabilized power supply to start and stop power output based on the starting output instruction and the stopping output instruction.
The constant current discharge mode instruction comprises a discharge current value setting instruction, a constant current discharge switching instruction, a load loading instruction and a load unloading instruction; and the direct current electronic load enters a constant current discharge mode by executing the constant current discharge mode instruction.
The constant resistance discharge mode instruction comprises a discharge resistance value setting instruction, a constant resistance discharge switching instruction, a load loading instruction and a load unloading instruction; and the direct current electronic load enters a constant resistance discharge mode by executing the constant resistance discharge mode instruction.
The constant power discharging mode instruction comprises a discharging power value setting instruction, a constant power discharging switching instruction, a load loading instruction and a load unloading instruction; and the direct current electronic load enters a constant power discharge mode by executing the constant power discharge mode instruction.
The sensing test unit comprises a current sensor, a voltage sensor and a temperature sensor; the current sensor is used for collecting the working current of the power battery to be measured; the voltage sensor is used for collecting working voltage between the anode and the cathode of the battery to be detected; the temperature sensor is used for collecting the surface temperature of the battery to be measured.
The data acquisition card comprises a signal preprocessing circuit, and the signal preprocessing circuit adopts a magnetoelectric coupling isolation amplifying component to preprocess the sensing signal and then sends the signal to a computer.
The test method for the charging and discharging performance of the military power battery comprises a charging mode test step and a discharging mode test step; the discharge mode comprises a constant current discharge mode, a constant voltage discharge mode and a constant power discharge mode; wherein the content of the first and second substances,
the step of testing the charging mode comprises the following steps:
the computer sends a charging and discharging switching instruction to the charging and discharging control unit, and the charging and discharging control unit is switched to a charging mode;
the computer sends a power supply starting instruction to the direct current stabilized power supply; sending a charging parameter setting instruction to the direct current stabilized power supply, and setting a charging voltage value and a charging current value;
the computer sends a data acquisition instruction to the data acquisition card, and acquires the current, voltage and surface temperature data of the power battery to be tested, which are measured by the sensing test unit;
the computer sends a starting output instruction to the direct current stabilized power supply, and the direct current stabilized power supply starts to charge the power battery to be tested according to the charging parameters;
the computer sends a command for turning off the output and a command for turning off the power supply to the DC stabilized power supply, and the test is finished;
the computer obtains a charging performance test result of the tested power battery based on the collected data;
the discharge mode testing step comprises the following steps:
the computer sends a charging and discharging switching instruction to the charging and discharging control unit, and the charging and discharging control unit is switched to a discharging mode;
the computer sends a load starting instruction to the direct current electronic load and sends a load mode setting instruction to the direct current electronic load, wherein the load mode setting instruction is a constant current discharge switching instruction, a constant resistance discharge switching instruction or a constant power discharge switching instruction; sending a parameter setting instruction to the direct current electronic load according to the set load mode, wherein the parameter setting instruction comprises setting a discharge current value, setting a discharge resistance value or setting a discharge power value;
the computer sends a data acquisition instruction to the data acquisition card, and acquires the current, voltage and surface temperature data of the power battery to be tested, which are measured by the sensing test unit;
the computer sends a load loading instruction to the direct current electronic load, and the tested power battery starts to discharge to the direct current electronic load according to the set discharge mode;
the computer sends a load unloading instruction to the direct current electronic load, and the test is finished;
the computer obtains a discharge performance test result of the tested power battery based on the collected data;
wherein, the execution step of the charge-discharge switching instruction is as follows:
the computer issues a charging and discharging switching instruction to the data processing card, and the data processing card transmits an instruction signal to 4 relay driving circuits of the charging and discharging control circuit to control the on and off of the relays;
after the charge-discharge switching instruction is executed, the first relay and the fourth relay are disconnected, the second relay and the third relay are closed, the second relay and the third relay connect the direct-current electronic load and the power battery to be tested, and the test system is switched to a discharge mode;
after the charging and discharging switching instruction is executed, the first relay and the second relay are closed, the third relay and the fourth relay are disconnected, the first relay and the second relay connect the direct-current stabilized voltage power supply and the power battery to be tested to form a charging loop, and the testing system is switched to a charging mode.
The invention has the following beneficial effects:
the invention can complete various test modes such as constant current charging, constant current discharging, constant voltage charging, constant voltage discharging test, comprehensive complex test and the like according to the requirements of users, the computer is used for adjusting charging and discharging parameters and switching the charging and discharging modes to collect, store, process and display real-time data such as the voltage, the current, the temperature and the like of the tested power battery, and after the test is completed, an electronic version test report is automatically generated, so that the automatic test is realized, the gross error caused by manual reading and counting is fundamentally avoided, the wiring and transition times during the power battery test are reduced, the light weight of the test equipment is realized, the hidden danger caused by excessive manual operation is reduced, the test efficiency is improved, and the economic benefit and the social benefit are obvious.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic diagram of a military power battery charging and discharging performance testing system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a DC voltage regulator according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a constant current discharge circuit of the DC electronic load according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of a constant resistance discharge circuit of a DC electronic load according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a constant power discharge circuit of a DC electronic load according to an embodiment of the present invention;
FIG. 6 is a diagram of a military power battery charging and discharging performance testing system according to an embodiment of the present invention;
FIG. 7 is a software main interface of a military power battery charging and discharging performance test system according to an embodiment of the present invention;
FIG. 8 is a software self-test interface of a military power battery charging and discharging performance test system according to an embodiment of the present invention;
FIG. 9 is a software debugging interface of a military power battery charging and discharging performance test system according to an embodiment of the present invention;
FIG. 10 is a graph of constant current discharge mode test data according to an embodiment of the present invention;
FIG. 11 shows test data for complex operating conditions according to an embodiment of the present invention.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
The invention provides a test system for the charge and discharge performance of a military power battery, which provides a plurality of charge and discharge test modes for the tested power battery, realizes automatic test by adjusting charge and discharge parameters, switching the charge and discharge modes and acquiring data through a computer, reduces hidden dangers caused by excessive manual operation, and improves the test efficiency.
System embodiment
One embodiment of the present invention discloses a military power battery charging and discharging performance testing system, as shown in fig. 1, the system includes: the device comprises a computer, a data processing card, a sensing test unit and a charging and discharging control unit; the charging and discharging control unit comprises a charging and discharging switching control circuit, a direct current stabilized power supply and a direct current electronic load.
The computer is connected with the data acquisition card through the PCI data interface of the mainboard inside the computer in sequence and is connected with the direct current electronic load and the direct current stabilized voltage power supply through the serial port of the computer.
The data processing card consists of a data processor, and a signal preprocessing circuit, an IO driving circuit and a communication circuit which are respectively connected with the data processor. The signal preprocessing circuit is provided with a sensing signal input terminal, the IO driving circuit is provided with an IO driving terminal, and the communication circuit is provided with a PCI interface. The sensing signal input terminal is connected with the sensing test unit, the IO driving terminal is connected with the charging and discharging control unit, and the data processing card is inserted into a PCI socket of a mainboard of the computer through a PCI interface.
Specifically, the communication circuit is responsible for data circuit connection between the data processor and the computer; the data processor converts the analog quantity sensing signal from the signal preprocessing circuit into a digital quantity through an analog-to-digital conversion interface of the data processor, and then uploads the digital quantity to the computer; the IO driving circuit has loading capacity, and after the data processor receives a mode switching instruction from the computer, a related instruction is issued to the charging and discharging control unit through the IO driving circuit to convert a test mode.
The sensing test unit is used for measuring a sensing signal of the power battery to be tested. Specifically, the sensing test unit measures the power battery to be tested by using a current sensor, a voltage sensor and a temperature sensor. A voltage sensing wire and a current sensing wire are led out from the tested battery, a temperature sensor is pasted in the middle of the upper portion of the tested power battery, and lead wires of the temperature sensor, the voltage sensing wire and the current sensing wire are connected to a sensing signal input terminal of the data processing card.
The charging and discharging switching control circuit comprises a first relay drive circuit, a second relay drive circuit, a third relay drive circuit and a fourth relay drive circuit, wherein each relay drive circuit controls one relay.
Specifically, the charge-discharge switching control circuit is connected in a circuit manner that: two ends of the first relay driving circuit are respectively connected with the anode of the direct current stabilized power supply and the anode of the direct current electronic load; two ends of the second relay driving circuit are respectively connected with the positive electrode of the direct current electronic load and the positive electrode test terminal of the power battery to be tested; two ends of the third relay driving circuit are respectively connected with the negative electrode of the direct-current stabilized power supply and the negative electrode of the direct-current electronic load, and the negative electrode of the direct-current stabilized power supply is also connected with a negative electrode test terminal of the power battery to be tested; two ends of the fourth relay driving circuit are respectively connected with the negative electrode of the direct current electronic load and the positive electrode test terminal of the power battery to be tested; and the control ends of the 4 relay drive circuits are connected to the IO drive terminal of the data processing card through a numerical control line.
The direct current stabilized power supply is a programmable power supply. The input end of the direct current power supply is an alternating current power supply (commercial power), and required direct current voltage and current are output to charge the military power battery.
Preferably, the dc regulated power supply is a switching type dc regulated power supply, and a schematic diagram thereof is shown in fig. 2. The switch type direct current stabilized power supply belongs to a high-frequency electric energy conversion device, and can control the direct current stabilized power supply to output voltage and current required by a charging mode by modulating pulse width.
Different from the traditional direct-current power supply, the output voltage of the direct-current stabilized power supply is realized by adjusting the on-off time of the transistor, the transistor can be prevented from working in an amplification region in the process of generating the output voltage, and the transistor is used for continuously switching between a full-open mode (saturation region) and a full-close mode (cut-off region) to work. The full-open mode and the full-close mode have the characteristic of low dissipation, the conversion before switching has higher power dissipation, but the time is very short, so the heat loss is small, and the energy-saving effect is obvious. The direct current stabilized power supply has small heat loss and high conversion efficiency, and because the direct current stabilized power supply has high working frequency, a transformer with small size and light weight can be used, so that the direct current stabilized power supply can also have smaller size and lighter weight than a common direct current power supply under the same power condition.
The direct current electronic load consists of a power field effect transistor and a control circuit. The direct current electronic load depends on the dissipation power of the power field effect transistor to consume electric energy by controlling the conduction quantity (duty ratio) of the internal power field effect transistor. The load current measuring device can accurately measure the load voltage, accurately adjust the load current, simultaneously simulate the load short circuit, simulate resistive, capacitive and inductive loads and accurately control the rise time of the load current.
The direct current electronic load carrier has a constant current discharge function and can be used for constant current discharge test of the power battery to be tested. Specifically, the computer can set the discharge current value and the starting and stopping conditions of the constant-current discharge mode, so that the automatic loading and unloading of the direct-current electronic load are realized. Along with the progress of the discharging process, the total voltage of the battery pack is reduced, the discharging current can be kept constant all the time, and the requirement of accurately measuring the capacity of the power battery is met. Fig. 3 is a schematic diagram of a constant current discharge circuit of a dc electronic load.
The direct current electronic load also has a constant resistance discharge function and can be used for the constant resistance discharge test of the power battery to be tested. Specifically, the computer can set a discharge resistance value and a start-up cutoff condition of the constant-resistance discharge mode, and automatic loading and unloading of the direct-current electronic load are achieved. Along with the progress of the discharge process, the direct current electronic load can keep accurate resistance, and the working performance of the power battery is tested. Fig. 4 is a schematic diagram of a constant resistance discharge circuit of a dc electronic load.
The direct current electronic load also has a constant power discharge function and can be used for testing the constant power discharge performance of the power battery to be tested. Specifically, the computer can set a discharge power value and a start-up cutoff condition of the constant-power discharge mode, and automatic loading and unloading of the direct-current electronic load are achieved. The computer automatically calculates the discharge current of the direct current electronic load according to the acquired real-time voltage of the power battery and loads the discharge current in real time; when the voltage of the power battery is reduced, the computer automatically increases the loading current of the direct current electronic load and keeps the power battery discharging at constant power. The constant power mode in the driving process of the electric automobile can be simulated, and the continuous power supply time of the power battery can be tested. Fig. 5 is a schematic diagram of a constant power discharge circuit for a dc electronic load.
And the signal preprocessing circuit adopts a magnetoelectric coupling isolation amplifying component to perform signal preprocessing on the sensing signal from the sensing signal input terminal. The magnetoelectric coupling isolation amplification assembly comprises a sending end module, a coupling device and a receiving end module. The sending end module comprises a preamplifier/filter, a pulse width modulator and a current source switch group which are connected in sequence; the coupling device comprises a coil and a magnetic sensor, and an insulating layer is arranged between the coil and the magnetic sensor; the receiving end module comprises an amplifying and shaping circuit and a low-pass filter which are connected in sequence.
The magnetoelectric coupling isolation amplifying assembly can prevent a data acquisition device from being influenced by potential destructive voltage appearing in a remote sensor, and meanwhile, measurement errors caused by a ground loop can be eliminated, so that the effects of isolating, transmitting and amplifying signals are achieved. The component has good linearity and temperature drift characteristics, the available voltage range is 0V-10V, the precision is 0.1%, and the measurement requirement is met.
Preferably, the current sensor employs a precision shunt. The precise current divider is a sensor for measuring direct current, can play a role in expanding the current range, is essentially a high-precision low-resistance resistor, can generate voltage at two ends of the resistor when direct current flows through the resistor, and then divides the voltage by the resistance value according to ohm's law to obtain the current value. And the precision current divider is connected with a computer through a GPIB interface.
Preferably, the current sensor is a hall closed-loop current sensor. The Hall closed-loop current sensor is a magnetoelectric conversion device which is made of semiconductor materials according to the Hall effect principle, can be used for nondestructively detecting the current of a detected lead, when the current passes through the detected lead, the sensor induces a Hall voltage signal, and the voltage signal is conducted to the signal preprocessing circuit through a sensing signal wire for processing.
According to the Hall effect principle, the current of the current-carrying conductor can be indirectly measured by measuring the Hall potential, so that the Hall closed-loop current sensor can realize the non-contact measurement of the current, the wiring operation difficulty and the electric shock risk in the current test are greatly reduced, the current test efficiency is improved, and the safety of the system is improved. The measurable current range of the Hall closed-loop current sensor is 0-10A, the detection precision is high, and the measurement requirement is met.
Preferably, the temperature sensor adopts an AD592CN type temperature sensor to acquire the ambient temperature, and the temperature sensor has the advantages that a linear relation exists between the actual temperature of the measured object and the output current, and the detection precision is high.
Preferably, the voltage sensor is implemented by a high-voltage differential measurement circuit. And the input end of the high-voltage differential measurement circuit is connected with the anode and the cathode of the tested power battery during testing, and outputs a voltage signal for the data acquisition card to perform acquisition and measurement.
The high-voltage differential measurement circuit can directly measure high-voltage signals, can overcome zero drift, has good common-mode noise rejection capability, has higher input impedance and lower capacitance at the input end, and can accurately measure differential voltage signals at high speed.
In the specific implementation process, the military power battery charging and discharging performance testing system is placed in the movable cabinet. As shown in fig. 6, the cabinet is a vertical box structure, the upper half of the front surface of the cabinet body is provided with a display screen, a mouse and a keyboard console of the computer, and the cabinet above the display screen is provided with a main power switch, a power indicator light and an emergency stop button; the lower half part of the cabinet body is provided with the computer host, a data processing card, a sensing test unit, a charging and discharging control unit, a direct current power supply and a direct current electronic load. The cabinet body is provided with four universal wheels, and has certain maneuverability.
Except that the tested battery and the sensor are arranged in the cabinet, other parts of the test system are all arranged in the cabinet, so that the electric leakage and electric shock risks caused by the exposure of the electric connection points of the equipment are avoided, the safety of the whole machine is greatly improved, and the test system is compact in integral structure, strong in maneuverability, high in reliability, firm and durable.
In order to simulate the charge and discharge characteristics of the military power battery under different climatic conditions, the tested power battery is preferably placed in an incubator for testing. The working temperature and humidity environment required by the power battery to be tested are controlled by the constant temperature box, and the charging and discharging characteristics of the military power battery under different climatic conditions can be simulated.
Test method embodiment
The invention discloses a power battery charging mode testing method, which comprises the following steps:
s1: the computer sends a charging and discharging switching instruction to the charging and discharging control unit, and the charging and discharging control unit is switched to a charging mode;
s2: the computer sends a power supply starting instruction to the direct current stabilized power supply; sending a charging parameter setting instruction to the direct current stabilized power supply, and setting a charging voltage value and a charging current value;
s3: the computer sends a data acquisition instruction to the data acquisition card, and acquires the current, voltage and surface temperature data of the power battery to be tested, which are measured by the sensing test unit;
s4: the computer sends a starting output instruction to the direct current stabilized power supply, and the direct current stabilized power supply starts to charge the power battery to be tested according to the charging parameters;
s5: the computer sends a command for turning off the output and a command for turning off the power supply to the DC stabilized power supply, and the test is finished;
s6: the computer obtains a charging performance test result of the tested power battery based on the collected data;
the invention discloses a power battery discharge mode testing method, which comprises the following steps:
s7: the computer sends a charging and discharging switching instruction to the charging and discharging control unit, and the charging and discharging control unit is switched to a discharging mode;
s8: the computer sends a load starting instruction to the direct current electronic load and sends a load mode setting instruction to the direct current electronic load, wherein the load mode setting instruction is a constant current discharge switching instruction, a constant resistance discharge switching instruction or a constant power discharge switching instruction; sending a parameter setting instruction to the direct current electronic load according to the set load mode, wherein the parameter setting instruction comprises setting a discharge current value, setting a discharge resistance value or setting a discharge power value;
s9: the computer sends a data acquisition instruction to the data acquisition card, and acquires the current, voltage and surface temperature data of the power battery to be tested, which are measured by the sensing test unit;
s10: the computer sends a load loading instruction to the direct current electronic load, and the tested power battery starts to discharge to the direct current electronic load according to the set discharge mode;
s11: the computer sends a load unloading instruction to the direct current electronic load, and the test is finished;
s12: the computer obtains a discharge performance test result of the tested power battery based on the collected data;
wherein, the computer of S1 and S7 sending the charge and discharge switching command to the charge and discharge control unit produces the following effects:
(1) the computer issues a charging and discharging switching instruction to the data processing card, and the data processing card transmits an instruction signal to 4 relay driving circuits of the charging and discharging control circuit to control the on and off of the relays;
(2) after the charge-discharge switching instruction is executed, the first relay and the fourth relay are disconnected, the second relay and the third relay are closed, the second relay and the third relay connect the direct-current electronic load and the power battery to be tested, and the test system is switched to a discharge mode;
(3) after the charging and discharging switching instruction is executed, the first relay and the second relay are closed, the third relay and the fourth relay are disconnected, the first relay and the second relay connect the direct-current stabilized voltage power supply and the power battery to be tested to form a charging loop, and the testing system is switched to a charging mode.
(4) Further, the invention can carry out working performance self-test on the direct current stabilized voltage power supply and the direct current electronic load: after the charge-discharge switching instruction is executed, the first relay and the third relay are closed, the second relay and the fourth relay are opened, and then the direct-current stabilized voltage power supply and the direct-current electronic load form a charging loop so as to enter a self-testing mode.
The working performance of the direct current stabilized voltage power supply and the direct current electronic load can be tested in the self-test mode. And in the self-test mode, the DC stabilized power supply is tested according to the steps from S2 to S5, the DC electronic load is tested according to the steps from S8 to S11, and the data acquisition and analysis objects during the test are the terminal voltage, the current and the temperature of the DC stabilized power supply.
Based on the further improvement of the scheme, the computer sets overcurrent, overvoltage and overheat protection values, monitors the sensing current, voltage and temperature in real time, gives an alarm once a signal value exceeds the protection value, can manually switch the test system to the closed state at the moment, or does not need manual operation, and gives an instruction to the charge and discharge control unit to switch the test system to the closed state after the default alarm starts for 20 seconds.
Examples of the test results
The computer software part operation interface of the test system of the present invention is shown in fig. 7-9.
The constant current discharge test is carried out under the condition that the ambient temperature is 20 ℃, and the main process is as follows: when the electric quantity is full, the power battery to be tested starts a constant-current discharge mode, and the discharge multiplying power is 1C. When the terminal voltage is lower than the cutoff voltage, the discharge is automatically stopped, and the obtained test data graph is shown in fig. 10.
The complex working condition test is carried out under the condition that the ambient temperature is 20 ℃, and the main process is as follows: when the electric quantity is full, the power battery to be tested starts a constant current discharge mode, the discharge rate is 1C, the discharge interval of the battery terminal voltage is 0.1V, the discharge time is 360 seconds, then the power battery is left for 600 seconds, the change rate of the terminal voltage is lower than 1mV/min, the power battery is discharged circularly, when the terminal voltage is lower than the cut-off voltage, the discharge is automatically stopped, and the obtained test data graph is shown in figure 11.
The test result shows that the test data acquired by the system has higher real-time performance, the test precision meets the requirement of health state evaluation on the power battery, and the performance of the system reaches the expectation. Compared with other test systems in the same industry at present, the system has high automation level and simple and convenient operation, and can greatly improve the test efficiency while ensuring the test quality.
The military power battery charge and discharge performance test system is successfully applied to the military lithium battery charge and discharge performance test of multiple units. The test result shows that: the system can effectively complete the test of the charge and discharge performance of the power battery under various working conditions, provides an effective technical means for the aspects of loading capacity, residual electricity quantity prediction, residual life estimation, comprehensive performance evaluation and the like of the military power battery, obviously improves the efficiency and automation level of the test of the charge and discharge performance of the military power battery, fundamentally eliminates the gross error introduced by human factors, effectively ensures the safety and quality of the tested military power battery, and provides reliable guarantee for the development, test and production of related military products.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The utility model provides a military power battery charge and discharge performance test system which characterized in that includes: the device comprises a computer, a data processing card, a sensing test unit and a charging and discharging control unit; wherein the content of the first and second substances,
the computer is used for generating a charging and discharging switching instruction, a charging mode instruction, a discharging mode instruction and a data acquisition instruction; the discharge mode instruction comprises a constant-current discharge mode instruction, a constant-voltage discharge mode instruction and a constant-power discharge mode instruction;
the data processing card is used for issuing the charging and discharging switching instruction to the charging and discharging control unit and acquiring and uploading the sensing signal from the sensing test unit to a computer after receiving the data acquisition instruction;
the sensing test unit is used for measuring a sensing signal of the power battery to be tested;
and the charge and discharge control unit is used for executing the charge and discharge switching instruction, the charge mode instruction and the discharge mode instruction and controlling the charge mode and the discharge mode of the tested power battery.
2. The military power battery charging and discharging performance testing system of claim 1, wherein the charging and discharging control unit comprises a charging and discharging switching control circuit, a direct current stabilized power supply and a direct current electronic load; wherein the content of the first and second substances,
the charging and discharging switching control circuit is used for executing a charging and discharging switching instruction from the data acquisition card and switching a charging and discharging mode;
the direct current stabilized voltage supply is a programmable direct current stabilized voltage supply and is used for executing a charging mode instruction from the computer and providing charging power under a charging mode for the tested power battery;
the direct current electronic load is a programmable direct current electronic load and is used for executing a discharging mode instruction from the computer and providing a discharging load in a discharging mode for the tested power battery.
3. The military power battery charging and discharging performance testing system of claim 2, wherein the charging and discharging switching control circuit comprises a first relay driving circuit, a second relay driving circuit, a third relay driving circuit and a fourth relay driving circuit, and each relay driving circuit respectively controls one relay;
two ends of the first relay driving circuit are respectively connected with the positive electrode of the direct current stabilized power supply and the positive electrode of the direct current electronic load; two ends of the second relay driving circuit are respectively connected with the positive electrode of the direct current electronic load and the positive electrode test terminal of the power battery to be tested; two ends of the third relay driving circuit are respectively connected with the negative electrode of the direct-current stabilized power supply and the negative electrode of the direct-current electronic load, and the negative electrode of the direct-current stabilized power supply is also connected with a negative electrode test terminal of the power battery to be tested; two ends of the fourth relay driving circuit are respectively connected with the negative electrode of the direct current electronic load and the positive electrode test terminal of the power battery to be tested; and the control ends of the 4 relay drive circuits are connected with a data acquisition card respectively.
4. The military power battery charge-discharge performance test system of claim 3, wherein the charge mode command comprises a power on command, a power off command, a charge current value setting, a charge voltage value setting, a power on output command, and a power off output command; the direct-current stabilized power supply controls the operation and the closing of a direct-current stabilized power supply circuit based on the power starting instruction and the power closing instruction, adjusts the charging voltage and the charging current based on the set charging current value and the set charging voltage value, and controls the direct-current stabilized power supply to start and stop power output based on the starting output instruction and the stopping output instruction.
5. The military power battery charge-discharge performance test system of claim 4, wherein the constant current discharge mode command comprises a set discharge current value, a switch constant current discharge command, a load command, and a load unload command; and the direct current electronic load enters a constant current discharge mode by executing the constant current discharge mode instruction.
6. The military power battery charge-discharge performance test system of claim 5, wherein the constant resistance discharge mode command comprises a set discharge resistance value, a switch constant resistance discharge command, a load command, and a load unload command; and the direct current electronic load enters a constant resistance discharge mode by executing the constant resistance discharge mode instruction.
7. The military power battery charge-discharge performance test system of claim 6, wherein the constant power discharge mode command comprises a set discharge power value, a switch constant power discharge command, a load command, and a load unload command; and the direct current electronic load enters a constant power discharge mode by executing the constant power discharge mode instruction.
8. The military power battery charge and discharge performance test system of claim 7, wherein the sensing test unit comprises a current sensor, a voltage sensor and a temperature sensor; the current sensor is used for collecting the working current of the power battery to be measured; the voltage sensor is used for collecting working voltage between the anode and the cathode of the battery to be detected; the temperature sensor is used for collecting the surface temperature of the battery to be measured.
9. The military power battery charge-discharge performance test system of claim 8, wherein the data acquisition card comprises a signal preprocessing circuit, and the signal preprocessing circuit adopts a magnetoelectric coupling isolation amplification component to preprocess the sensing signal and then sends the preprocessed signal to a computer.
10. A military power battery charge and discharge performance test method using the test system of any one of claims 1-9, wherein the test steps of charge mode and discharge mode; the discharge mode comprises a constant current discharge mode, a constant voltage discharge mode and a constant power discharge mode; wherein the content of the first and second substances,
the step of testing the charging mode comprises the following steps:
the computer sends a charging and discharging switching instruction to the charging and discharging control unit, and the charging and discharging control unit is switched to a charging mode;
the computer sends a power supply starting instruction to the direct current stabilized power supply; sending a charging parameter setting instruction to the direct current stabilized power supply, and setting a charging voltage value and a charging current value;
the computer sends a data acquisition instruction to the data acquisition card, and acquires the current, voltage and surface temperature data of the power battery to be tested, which are measured by the sensing test unit;
the computer sends a starting output instruction to the direct current stabilized power supply, and the direct current stabilized power supply starts to charge the power battery to be tested according to the charging parameters;
the computer sends a command for turning off the output and a command for turning off the power supply to the DC stabilized power supply, and the test is finished;
the computer obtains a charging performance test result of the tested power battery based on the collected data;
the discharge mode testing step comprises the following steps:
the computer sends a charging and discharging switching instruction to the charging and discharging control unit, and the charging and discharging control unit is switched to a discharging mode;
the computer sends a load starting instruction to the direct current electronic load and sends a load mode setting instruction to the direct current electronic load, wherein the load mode setting instruction is a constant current discharge switching instruction, a constant resistance discharge switching instruction or a constant power discharge switching instruction; sending a parameter setting instruction to the direct current electronic load according to the set load mode, wherein the parameter setting instruction comprises setting a discharge current value, setting a discharge resistance value or setting a discharge power value;
the computer sends a data acquisition instruction to the data acquisition card, and acquires the current, voltage and surface temperature data of the power battery to be tested, which are measured by the sensing test unit;
the computer sends a load loading instruction to the direct current electronic load, and the tested power battery starts to discharge to the direct current electronic load according to the set discharge mode;
the computer sends a load unloading instruction to the direct current electronic load, and the test is finished;
the computer obtains a discharge performance test result of the tested power battery based on the collected data;
wherein, the execution step of the charge-discharge switching instruction is as follows:
the computer issues a charging and discharging switching instruction to the data processing card, and the data processing card transmits an instruction signal to 4 relay driving circuits of the charging and discharging control circuit to control the on and off of the relays;
after the charge-discharge switching instruction is executed, the first relay and the fourth relay are disconnected, the second relay and the third relay are closed, the second relay and the third relay connect the direct-current electronic load and the power battery to be tested, and the test system is switched to a discharge mode;
after the charging and discharging switching instruction is executed, the first relay and the second relay are closed, the third relay and the fourth relay are disconnected, the first relay and the second relay connect the direct-current stabilized voltage power supply and the power battery to be tested to form a charging loop, and the testing system is switched to a charging mode.
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