A supercapacitor module charging and discharging test system and test method

Abstract

The present application provides a supercapacitor module charge and discharge test system, including: a control unit; a first and a second power control unit, respectively connected to the control unit; a reactor, connected to the control unit; a first supercapacitor module, connected to the control unit, and connected in series with the reactor through the first power control unit, and connected to a DC charge and discharge power supply through a first switch; a second supercapacitor module, connected to the control unit, and connected in series with the reactor through the second power control unit, and connected to a DC charge and discharge power supply through a second switch. The present invention also provides a test method for a supercapacitor module charge and discharge test system. The supercapacitor module charge and discharge test system provided by the present invention can break the boundaries of complete sets of products and form a test device that integrates high voltage, controllable kiloampere current testing, and charging and discharging of supercapacitor modules.

Description

Technical Field

[0001] The present application relates to the field of power electronic control technology, and in particular to a supercapacitor module charging and discharging test system and test method. Background Art

[0002] A supercapacitor module is a module containing multiple supercapacitors, and its capacity can reach the Farad level. It is a new type of energy storage device between traditional capacitors and batteries, with high power density, long life, fast charging and discharging, wide temperature range, green environmental protection and high reliability. In recent years, it has been widely used in power systems in various scenarios such as grid voltage stability, instantaneous high power support, system over- and under-voltage protection, primary frequency modulation, and secondary frequency modulation. As power equipment has extremely high requirements for supercapacitor high reliability and long service life, the voltage resistance of supercapacitor modules in various application scenarios, the voltage balancing of single cores in the module, especially the voltage balancing and internal resistance consistency after high current charging and discharging, have gradually attracted attention, and are also the minimum guarantee of product quality by supercapacitor manufacturers.

[0003] Currently, the characteristic tests on supercapacitors are all done on the complete set of products after the supercapacitors are assembled into products. Due to the limitations of the complete set of products, there have been no tests on extreme working conditions based on the supercapacitor module itself, nor have there been any charge and discharge tests on the supercapacitor module or verification of voltage consistency. Summary of the invention

[0004] The present application provides a supercapacitor module charge and discharge test system and test method to solve the problem of how to perform extreme working condition testing on a supercapacitor module body.

[0005] In order to solve the above technical problems, the present application provides a supercapacitor module charge and discharge test system, including: a control unit; a first and a second power control unit, respectively connected to the control unit; a reactor, connected to the control unit; a first supercapacitor module, connected to the control unit, and connected in series with the reactor through the first power control unit, and connected to a DC charge and discharge power supply through a first switch; a second supercapacitor module, connected to the control unit, and connected in series with the reactor through the second power control unit, and connected to the DC charge and discharge power supply through a second switch.

[0006] Furthermore, the control unit includes a current acquisition sensor, and the current acquisition sensor is connected to the reactor.

[0007] Furthermore, the first and second power control units are one of a half-bridge module, a full-bridge module, a Buck-Boos module, and a combination thereof.

[0008] Furthermore, the first and second power control units are both half-bridge modules, and the half-bridge modules include: a first switch tube and a second switch tube connected in series with each other, a capacitor connected in parallel with the first switch tube and the second switch tube, a resistor connected in parallel with the first switch tube and the second switch tube, and a circuit breaker and a fuse connected in series with the first switch tube and the second switch tube.

[0009] Furthermore, the DC charging and discharging power supply is an integrated charging and discharging power supply or is obtained by rectifying an AC power supply.

[0010] The present invention also provides a test method for a supercapacitor module charge and discharge test system, comprising:

[0011] Step 1: charging the first supercapacitor module and the second supercapacitor module to a first test voltage through the DC charge-discharge power supply;

[0012] Step 2, the control unit sends a target current value and a target current duration, and sets the first supercapacitor module as a charging test group and the second supercapacitor module as a discharging test group;

[0013] Step 3: the first power control unit and the second power control unit are adjusted according to the target current value and the target current duration, so that the target current value is maintained on the reactor within the target current duration;

[0014] Step 4: The DC charge-discharge power supply adjusts the voltage change on the first supercapacitor module and the second supercapacitor module to a second test voltage;

[0015] Repeat the charge and discharge process of steps three and four, wherein the first supercapacitor module is set as a discharge test group and the second supercapacitor module is set as a charge test group.

[0016] Furthermore, in a test method of a supercapacitor module charge and discharge test system, the first test voltage is equal to the second test voltage.

[0017] Furthermore, in the test method of the supercapacitor module charging and discharging test system, the first power control unit and the second power control unit are adjusted according to the target current value and the target current duration, including: the first power control unit and the second power control unit turn on and off devices to make the actual current fit the target current value.

[0018] The present invention also provides a test method for a supercapacitor module charge and discharge test system, comprising:

[0019] Charging the first supercapacitor module and the second supercapacitor module to a third test voltage through the DC charge-discharge power supply;

[0020] The first switch and the second switch are disconnected, and the control unit monitors and records the voltage attenuation values ​​of the first supercapacitor module and the second supercapacitor module during the withstand voltage test duration, and obtains the internal resistance of the first supercapacitor module and the single-core internal resistance, and the internal resistance of the second supercapacitor module and the single-core internal resistance according to the voltage attenuation values.

[0021] The supercapacitor module charge and discharge test system provided by the present invention can break the boundaries of complete sets of products and form a test device that integrates supercapacitor module high voltage, controllable kiloampere-level current testing, and charging and discharging. Through a simple control algorithm and topological structure, a supercapacitor cluster-level large-current charge and discharge test can be achieved, and the current size and time can be precisely controlled. At the same time, the control unit can simultaneously realize multiple functions such as control instruction issuance, supercapacitor module internal information monitoring, overcurrent, overvoltage protection, etc.

[0022] The test method of the supercapacitor module charge and discharge test system provided by the present invention performs charge and discharge tests and extreme working condition tests on the supercapacitor module body, and can simultaneously develop multiple test functions such as DC withstand voltage test and internal resistance imbalance. The test efficiency is greatly improved, and the consistency of the product during the test process can be tested more strictly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of the structure of a supercapacitor module charge and discharge test system provided in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of load current varying with time for a test system provided by an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the on / off instructions of the switch device of the first power unit T1 provided in an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of the on / off instructions of the switch device of the second power unit T2 provided in an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of charging and discharging of a first supercapacitor module and a second supercapacitor module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0033] Figure 1 This is a schematic diagram of the structure of a supercapacitor module charge and discharge test system provided by an embodiment of the present invention. Figure 1 The present application provides a supercapacitor module charge and discharge test system, including: a control unit 101; a first and a second power control unit, respectively connected to the control unit 101; a reactor 102, connected to the control unit 101; a first supercapacitor module 103, connected to the control unit 101, and connected in series with the reactor 102 through the first power control unit, and connected to a DC charge and discharge power supply 105 through a first switch K1; a second supercapacitor module 106, connected to the control unit 101, and connected in series with the reactor 102 through the second power control unit, and connected to the DC charge and discharge power supply 105 through a second switch K2.

[0034] The control unit 101 includes a current acquisition sensor 101a, which is connected to the reactor 102. The current acquisition sensor 101a performs closed-loop control on the test current and quickly protects various fault conditions that occur during the test, such as single-core overvoltage, overcurrent, and overheating. The control unit 101 also includes a controller and a human-machine operation background, which can monitor and record the voltage, internal resistance, temperature and other information of each single-core of the supercapacitor module in the supercapacitor module in real time, and issue test instructions such as target current value and target current duration.

[0035] The first and second power control units are one of a half-bridge module, a full-bridge module, a Buck-Boos module, and a combination thereof. The first and second power control units are mainly used in the test system to realize the controllable charging and discharging, state monitoring, protection and other functions of the supercapacitor module. In an embodiment of the present invention, the first and second power control units are both half-bridge modules, and the half-bridge module includes: a first switch tube T1 and a second switch tube T2 connected in series with each other, a capacitor C connected in parallel with the first switch tube T1 and the second switch tube T2, a resistor R connected in parallel with the first switch tube T1 and the second switch tube T2, and a circuit breaker and a fuse FU connected in series with the first switch tube T1 and the second switch tube T2. The circuit breaker and the fuse FU can prevent the supercapacitor module from a short circuit condition.

[0036] The DC charging and discharging power supply is an integrated charging and discharging power supply or is obtained by rectifying an AC power supply, and controls the test voltage values ​​on the first supercapacitor module 103 and the second supercapacitor module 106 through the first switch K1 and the second switch K2 respectively.

[0037] Figure 2 A schematic diagram of load current varying with time for a test system provided by an embodiment of the present invention; Figure 3 A schematic diagram of a turn-on instruction of the first switch tube T1 provided in an embodiment of the present invention; Figure 4 A schematic diagram of the on / off instructions of the second switch tube T2 provided in an embodiment of the present invention; Figure 5 Schematic diagram of charging and discharging of the first supercapacitor module and the second supercapacitor module provided by an embodiment of the present invention. Figure 2 , the load current on the reactor 102 is 2500A, the target current maintenance time is 125ms, refer to Figure 3 The first switch tube T1 is always turned on for 125ms, so that the discharge power unit can be continuously discharged, and the first super capacitor module 103 can be continuously discharged (refer to Figure 5 middle curve 2); refer to Figure 4, the first switch tube T2, when the current value is less than the preset value 2500A, T2 is closed and the current increases; when the current is greater than the preset value 2500A, T2 is turned on and the current decreases, and the corresponding second supercapacitor module 106 continues to charge (refer to Figure 5 Specifically, Figure 5 In the process, the starting voltages of the two power control units are consistent, the voltage of the discharging power control unit decreases, and the voltage of the charging power control unit increases.

[0038] The supercapacitor module charge and discharge test system provided by the present invention can break the boundaries of complete sets of products and form a test device that integrates supercapacitor module high voltage, controllable kiloampere-level current testing, and charging and discharging. Through a simple control algorithm and topological structure, a supercapacitor cluster-level large-current charge and discharge test can be achieved, and the current size and time can be precisely controlled. At the same time, the control unit can simultaneously realize multiple functions such as control instruction issuance, supercapacitor module internal information monitoring, overcurrent, overvoltage protection, etc.

[0039] The embodiment of the present invention also provides a test method of a supercapacitor module charge and discharge test system, including:

[0040] Step 1: charging the first supercapacitor module and the second supercapacitor module to a first test voltage through the DC charge-discharge power supply;

[0041] Step 2, the control unit sends a target current value and a target current duration, and sets the first supercapacitor module as a charging test group and the second supercapacitor module as a discharging test group;

[0042] Step 3: the first power control unit and the second power control unit are adjusted according to the target current value and the target current duration, so that the target current value is maintained on the reactor within the target current duration;

[0043] Step 4: The DC charge-discharge power supply adjusts the voltage change on the first supercapacitor module and the second supercapacitor module to a second test voltage;

[0044] Repeat the charge and discharge process of steps three and four, wherein the first supercapacitor module is set as a discharge test group and the second supercapacitor module is set as a charge test group.

[0045] In the embodiment of the present invention, after the first charge and discharge test is completed in step 3, the first supercapacitor module and the second supercapacitor module are charged and discharged at the first test voltage at the same time, resulting in the voltage of the first supercapacitor module and the second supercapacitor module being inconsistent. Before the second charge and discharge test is performed, the voltage of the first supercapacitor module and the second supercapacitor module need to be adjusted to the same using a DC charge and discharge power supply. In the embodiment of the present invention, the first test voltage is equal to the second test voltage.

[0046] In step three, the first power control unit and the second power control unit are adjusted according to the target current value and the target current duration, including: the first power control unit and the second power control unit turn on and off devices to make the actual current fit the target current value.

[0047] The present invention also provides a test method for a supercapacitor module charge and discharge test system, comprising:

[0048] Charging the first supercapacitor module and the second supercapacitor module to a third test voltage through the DC charge-discharge power supply;

[0049] The first switch and the second switch are disconnected, and the control unit monitors and records the voltage attenuation values ​​of the first supercapacitor module and the second supercapacitor module during the withstand voltage test duration, and obtains the internal resistance of the first supercapacitor module and the single-core internal resistance, and the internal resistance of the second supercapacitor module and the single-core internal resistance according to the voltage attenuation values.

[0050] In the embodiment of the present invention, the first supercapacitor module and the second supercapacitor module each include 14 supercapacitor modules, and the DC charging device charges the supercapacitor cluster to maintain a withstand voltage of 1250V for 5 minutes. The initial single-core voltage value Vu=3V, after 10 minutes, the voltage value Vt=2.5V is recorded at this time, and the internal resistance is calculated: Vt=Vu*exp(-t / RC), where C=1500F, t=600s, then R can be calculated as the internal resistance value. The entire calculation process can be automatically completed by the program.

[0051] The test method of the supercapacitor module charge and discharge test system provided by the present invention performs charge and discharge tests and extreme working condition tests on the supercapacitor module body, and can simultaneously develop multiple test functions such as DC withstand voltage test and internal resistance imbalance. The test efficiency is greatly improved, and the consistency of the product during the test process can be tested more strictly.

[0052] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection created by this application.

Claims

1. A supercapacitor module charge and discharge test system, characterized in that: include: Control unit; A first power control unit and a second power control unit are connected to the control unit respectively; A reactor connected to the control unit; A first supercapacitor module is connected to the control unit, and is connected in series with the reactor through the first power control unit, and is connected to a DC charging and discharging power supply through a first switch; A second supercapacitor module is connected to the control unit, and is connected in series with the reactor through the second power control unit, and is connected to the DC charging and discharging power supply through a second switch. The first supercapacitor module and the second supercapacitor module are each other's tested modules. When the first supercapacitor module is set as a charging test group, the second supercapacitor module is a discharging test group. When the first supercapacitor module is set as a discharging test group, the second supercapacitor module is a charging test group. The control unit sends a target current value and a target current duration. The first power control unit and the second power control unit are adjusted according to the target current value and the target current duration so that the target current value is maintained on the reactor within the target current duration.

2. The supercapacitor module charge and discharge test system according to claim 1, characterized in that: The control unit comprises a current acquisition sensor, and the current acquisition sensor is connected to the reactor.

3. The supercapacitor module charge and discharge test system according to claim 1, characterized in that: The first and second power control units are one of a half-bridge module, a full-bridge module, and a Buck-Boos module, or a combination thereof.

4. The supercapacitor module charge and discharge test system according to claim 1, characterized in that: The first and second power control units are both half-bridge modules, and the half-bridge module includes: a first switch tube and a second switch tube connected in series with each other, a capacitor connected in parallel with the first switch tube and the second switch tube, a resistor connected in parallel with the first switch tube and the second switch tube, and a circuit breaker and a fuse connected in series with the first switch tube and the second switch tube.

5. The supercapacitor module charge and discharge test system according to claim 1, characterized in that: The DC charging and discharging power supply is an integrated charging and discharging power supply or is obtained by rectifying an AC power supply.

6. A test method for a supercapacitor module charge and discharge test system as claimed in claim 1, characterized in that: include: Step 1: charging the first supercapacitor module and the second supercapacitor module to a first test voltage through the DC charge-discharge power supply; Step 2, the control unit sends a target current value and a target current duration, and sets the first supercapacitor module as a charging test group and the second supercapacitor module as a discharging test group; Step 3: the first power control unit and the second power control unit are adjusted according to the target current value and the target current duration, so that the target current value is maintained on the reactor within the target current duration; Step 4: The DC charge-discharge power supply adjusts the voltage change on the first supercapacitor module and the second supercapacitor module to a second test voltage; Repeat the charge and discharge process of steps three and four, wherein the first supercapacitor module is set as a discharge test group and the second supercapacitor module is set as a charge test group.

7. The test method of the supercapacitor module charge and discharge test system according to claim 6, characterized in that: The first test voltage is equal to the second test voltage.

8. The test method of the supercapacitor module charge and discharge test system according to claim 6, characterized in that: The first power control unit and the second power control unit adjust according to the target current value and the target current duration, including: the first power control unit and the second power control unit turn on and off devices to make the actual current fit the target current value.

9. A test method for a supercapacitor module charge and discharge test system as claimed in claim 1, characterized in that: include: Charging the first supercapacitor module and the second supercapacitor module to a third test voltage through the DC charge-discharge power supply; The first switch and the second switch are disconnected, and the control unit monitors and records the voltage attenuation values ​​of the first supercapacitor module and the second supercapacitor module during the withstand voltage test duration, and obtains the internal resistance of the first supercapacitor module and the single-core internal resistance, and the internal resistance of the second supercapacitor module and the single-core internal resistance according to the voltage attenuation values.

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