[0021] In conjunction with the accompanying drawings, the specific embodiments of the present invention are further described:
[0022] In one embodiment, a supercapacitor battery capacity detection system includes: an electronic computer, a tested supercapacitor battery, a detection device, a relay, a temperature sensor, and a single-chip automatic control system. The electronic computer communicates with the single-chip microcomputer through the serial port. The electronic computer stores the test software for controlling the charging and discharging of the battery. The testing device transmits the test data of the DC electronic load and the DC power supply from the serial port to the computer through the software. The single-chip microcomputer controls the opening and closing of the relay to test the super capacitor battery. The testing device includes a DC power supply for charging the battery, a DC electronic load for testing the battery capacity, and testing software. The testing process is divided into charging and discharging. During charging, constant current charging is performed first, and the voltage is increased. After the voltage reaches a predetermined value, the test is performed. The software controls the DC power supply for constant voltage charging. At this time, the charging current gradually decreases. When the current is lower than the set value, the battery is fully charged. During the charging process, the temperature sensor is fixed on the surface of the battery, and the single-chip microcomputer collects the temperature information through the sensor and transmits it to the computer to realize real-time monitoring of the battery temperature. Once the battery temperature exceeds the set value, the single-chip microcomputer will send an instruction to immediately disconnect the relay and stop. charge to keep the battery safe. The test system communicates with the computer through the serial port. The test system converts the detected voltage, current, temperature and time information of the battery into digital information through the A\D converter and displays it on the computer in real time. After the charging is completed, the computer controls the relay to disconnect through the microcontroller
[0023] The power supply stops charging, turns on the load, and enters the discharging process. At this time, the battery conducts a constant current discharge test according to the set current value. When the voltage drops to the set value (the discharge cut-off voltage of a battery with a rated voltage of 12v is set to 10.5V) ), the discharge is over, and during the discharge process, the test software displays the parameters of the battery in real time through the computer, and automatically generates a discharge curve to obtain the capacity of the supercapacitor battery (the integral of the instantaneous discharge current to the discharge time).
[0024] The above method tests the normal temperature capacity of the battery. Considering the particularity of the battery application environment, the low temperature capacity, high rate discharge capacity and charge acceptance capacity of the battery are tested, that is, the actual capacity of the battery under low temperature conditions, and the discharge at different constant currents. The actual capacity of the battery and the actual capacity of the battery obtained when charged in different ways; automated testing of battery energy density and power density.
[0025] like figure 1 As shown, the computer and the single-chip automatic control system transmit data to each other through USB to serial port, the single-chip computer controls the opening and closing of the relay by judging the computer data, and the temperature sensor collects data during charging and transmits it to the automatic control system. After the charging is completed, the measured capacitance The battery discharges the DC electronic load. During the whole process, the detection device and the computer system always maintain serial communication. The detection device transmits the information to the computer through the A\D converter for display. After the detection, the detection software automatically generates a discharge curve and obtains the battery capacity.
[0026] like figure 2 As shown, open the test software, and select the battery test mode. The test modes include: actual capacity test, high rate discharge test, fast charge test, -15℃ low temperature capacity test, -30℃ low temperature capacity test, power density test, energy density test Test, cycle life test; input the set parameters, including voltage, current, time, temperature, click the start test button, the test software will automatically preprocess the battery under test, that is, the original power in the battery will be discharged, and the battery under test will enter the charging process , the temperature sensor ensures the safety of the battery. After the battery is fully charged, the single-chip microcomputer controls the relay to automatically switch to the discharge mode. When the battery voltage is lower than the set value, the discharge ends, the relay disconnects the battery from the load, and the test software displays the discharge curve to obtain the battery. capacity, data graphs are displayed and saved on the computer software.
[0027] like image 3 As shown, select the test mode through the software, input the setting parameters to the computer, save and click start, after the software preprocesses the battery through the microcontroller, the microcontroller controls the relay to switch to constant current charging, and the temperature sensor collects the temperature of the battery and transmits it to the microcontroller to ensure that The battery is safe. After the voltage reaches the set value, it is changed to constant voltage charging until the current is lower than the set value, the battery is fully charged, and the computer displays and saves the charging result.
[0028]In one embodiment, an incubator is added to perform a charging test. For example, when a high-current charging test is performed, the battery temperature will rise due to the high current. In order to avoid errors caused by too fast temperature changes, the battery is charged in an incubator. . Similarly, when testing the low-temperature capacity and discharge capacity, discharge the battery in the incubator, set the temperature of the incubator, and start the test when the incubator reaches the predetermined temperature. Control, and realize real-time monitoring of battery temperature, charging voltage and current.
[0029] The realization of power density (that is, the product of the discharge cut-off voltage corresponding to the battery state of charge and the maximum discharge current is the discharge power, and the ratio of the discharge power to the battery quality is the power density) and energy density (the actual capacity is multiplied by the average discharge voltage and then discharged. divided by the battery mass).
[0030] like Figure 4 As shown in the figure, after the charging is completed, the single-chip microcomputer controls the relay to switch to discharge. When the voltage is lower than the set value, the relay is disconnected. After the discharge is completed, the test software automatically generates the discharge curve, obtains the capacity, and saves it on the computer.
[0031] Specific operation process: Open the test software, input the set voltage, current, time, and temperature parameters, click to start the test, the temperature sensor collects the temperature information and transmits it to the computer, and the automatic control system controls the opening and closing of the relay to ensure the smooth progress of the test process. After the test, the computer will display the charge-discharge curve to obtain the battery capacity and save the data.
[0032] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deductions or substitutions can be made, which should be regarded as belonging to the protection scope of the present invention.
