Device and method for evaluating temperature rise characteristic of electric appliance accessory of energy storage system under constant current

Abstract

The invention discloses a device and a method for evaluating the temperature rise characteristic of an electric appliance accessory of an energy storage system under a constant current, and the method comprises the steps: obtaining the temperature rise change data of the electric appliance accessory to be evaluated through a power supply and a data acquisition instrument, and enabling the power supply to be connected with a voltage resolver in parallel; the voltage resolver adopts a small-capacity and low-voltage battery or a super capacitor of which the open-circuit voltage is smaller than the maximum applicable voltage of the power supply, the power supply is a programmable constant-current power supply, the positive electrode and the negative electrode of the power supply are correspondingly connected with the electric appliance accessories, and the power supply monitors the current passing through the electric appliance accessories in real time; the voltage resolver feeds back the actual voltage of the voltage resolver to the power supply, so that the power supply is maintained to output constant working current to the electric appliance accessory, the electric appliance accessory is provided with a temperature sensor, and the data acquisition instrument acquires temperature rise change data of the electric appliance accessory under the limit working current through the temperature sensor. According to the invention, stable constant current can be provided for electrical accessories during testing, and the data precision of temperature rise testing is improved.

Description

Technical Field

[0001] The invention relates to a device and method for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current. Background Art

[0002] As an essential component of energy storage systems, the temperature rise characteristics of electrical accessories have a significant impact on the safety of these systems. For example, a fuse's primary function is to cut off the circuit when a circuit malfunctions or anomalies occur, accompanied by a continuous increase in current. This increased current in the circuit can damage certain important or valuable components in the circuit, burn out the circuit, or even cause a fire. If the fuse is correctly placed in the circuit, it will melt and cut off the current when the current abnormally rises to a certain height and temperature, thereby protecting the safe operation of the circuit. Therefore, evaluating the temperature rise characteristics of electrical accessories such as fuses can help match them with more suitable service environments and systems, thereby safeguarding the high-quality development of energy storage systems.

[0003] Chinese patent publication number CN105425143A discloses "A Fuse Temperature Testing Device and Method," which evaluates the temperature rise characteristics of a fuse by detecting the temperature of a glycerin pool. This method is complex to operate, has low adaptability, and produces delayed test data.

[0004] Chinese patent publication number CN116879728A discloses a "fuse quality assessment device," which uses a low-voltage transformer, a movable transformer connector, and a stepper motor as a low-voltage, high-current simulator. The test device is relatively complex, the test operation steps are cumbersome, and the accuracy of current control is also insufficient.

[0005] The temperature-rise tests on existing fuses described above reflect the temperature-rise characteristics of electrical accessories such as fuses at constant power, but cannot reflect their temperature-rise characteristics at limiting current. New energy storage is a crucial technology and fundamental equipment for building new power systems. With the rapid development of power storage facilities, electrical accessories, as a crucial component of energy storage systems, are crucial for studying their temperature-rise characteristics in different service environments.

[0006] Existing constant-current power supplies are primarily used in applications requiring strict current control, such as LED driving, battery charging, and sensor power supply. They can generally only provide a stable, low current. Temperature-rise testing of electrical accessories in energy storage systems requires low voltage and high current, such as 0-5V voltage and 300A or higher. Conventional constant-current power supplies are unable to provide the high currents required for temperature-rise testing of electrical accessories. Summary of the Invention

[0007] One of the purposes of the present invention is to provide a device for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current, which can be used to evaluate the temperature rise characteristics of electrical accessories under constant current.

[0008] One of the purposes of the present invention is to adopt the following technical solutions:

[0009] A device for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current, comprising a power supply, a data acquisition instrument and the electrical accessory to be evaluated, characterized in that it also includes a voltage decomposer, the voltage decomposer being connected in parallel with the power supply, the voltage decomposer being a battery whose open-circuit voltage is within the applicable voltage range of the power supply, the power supply being a programmable constant current power supply, the positive and negative poles of the power supply being correspondingly connected to the electrical accessory, the power supply monitoring the current passing through the electrical accessory in real time, the voltage decomposer feeding back the actual voltage of the voltage decomposer to the power supply, thereby maintaining the constant current output by the power supply to the electrical accessory, the electrical accessory being provided with a temperature sensor, and the data acquisition instrument collecting temperature rise change data of the electrical accessory through the temperature sensor.

[0010] The present invention is to build a test circuit that can output a constant large current. A programmable constant current power supply is connected to a voltage splitter composed of a battery. The voltage splitter feeds back the actual voltage of the voltage splitter to the power supply. The feedback voltage power supply provided by the voltage splitter can maintain a constant current output.

[0011] As some feasible implementation methods of the present invention, the voltage decomposer uses a small-capacity, low-voltage battery or supercapacitor whose open-circuit voltage is less than the maximum applicable voltage of the power supply, and the small-capacity, low-voltage battery uses a lithium-ion battery, a sodium-ion battery or a lead-acid battery.

[0012] As a preferred embodiment of the present invention, the constant current output by the power supply to the electrical accessory is the limiting operating current of the electrical accessory. By detecting the temperature rise characteristics of the electrical accessory under the limiting current, the maximum load boundary of the electrical accessory can be clarified, thereby providing theoretical support for the design and construction of the electrical circuit of the energy storage system.

[0013] The present invention can simultaneously test the temperature rise data of multiple electrical accessories, improving testing efficiency. When testing multiple electrical accessories, the power supply is connected to multiple electrical accessories connected in series; the electrical accessories may be high-voltage fuses, low-voltage fuses, isolating switches, and / or transformers. Multiple electrical accessories of the same type can be connected in series, or different electrical accessories can be connected in series to the power supply, provided the output current does not exceed the current limit of the electrical accessory being tested.

[0014] As a preferred embodiment of the present invention, the data acquisition instrument collects the temperature data of the electrical accessory once every 30n seconds, where n is a positive integer.

[0015] The power supply of the present invention adopts an Arbin-type battery testing system, which can provide low voltage and high current, making it easier to build a test circuit. The power supply can also adopt other adjustable constant current power supplies with similar functions that can output low voltage and high current.

[0016] An even number of the temperature sensors are symmetrically arranged on the geometrically symmetrical surface of the electrical accessory of the present invention, and the accuracy of the temperature detection data is improved by the multiple temperature sensors symmetrically arranged on the electrical accessory.

[0017] The temperature sensor of the present invention is a thermocouple temperature sensor.

[0018] A second object of the present invention is to provide a method for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current, using a power supply and a data acquisition instrument to obtain temperature rise change data of the electrical accessories to be evaluated, a voltage decomposer is connected in parallel to the power supply, the voltage decomposer uses a small-capacity, low-voltage battery or supercapacitor whose open-circuit voltage is less than the maximum applicable voltage of the power supply, the power supply is a programmable constant current power supply, the positive and negative poles of the power supply are correspondingly connected to the electrical accessories, the power supply monitors the current passing through the electrical accessories in real time, the voltage decomposer feeds back the actual voltage of the voltage decomposer to the power supply, thereby maintaining the power supply outputting a constant limit working current of the electrical accessory to the electrical accessory, the electrical accessory is provided with a temperature sensor, and the data acquisition instrument collects the temperature rise change data of the electrical accessory under its limit working current through the temperature sensor.

[0019] The power supply adopts an Arbin type battery test system and cooperates with the voltage resolver of the present invention to output low voltage and stable high current, and maintain the power supply outputting a constant limit working current of the electrical accessory to the electrical accessory.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This invention innovatively proposes a device that uses a constant large current to test the temperature rise characteristics of electrical accessories of energy storage systems under the limiting operating current, filling a gap in this field. By detecting the temperature rise characteristics of electrical accessories under the limiting current, the maximum load boundary of the electrical accessories can be clarified, thereby providing theoretical support for the design and construction of the electrical circuit of the energy storage system, and then matching the electrical accessories with a more suitable service environment and system, thereby improving the safety and service life of the energy storage system.

[0022] 2. This invention establishes a low-voltage, high-current test circuit that can continuously and stably output high current to electrical accessories. This simple test circuit can evaluate the temperature-rise characteristics of electrical accessories such as high-voltage fuses, low-voltage fuses, disconnect switches, and transformers. Furthermore, a single test circuit can simultaneously measure the temperature-rise characteristics of multiple electrical accessories, offering a wide range of applications and high testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a device for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current provided by the present invention;

[0024] Figure 2 This is the temperature rise characteristic diagram of the high-voltage fuse in Test Example 1;

[0025] Figure 3 This is the temperature rise characteristic diagram of the low-voltage fuse in Test Example 2;

[0026] Figure 4 This is the temperature rise characteristic diagram of the disconnector in test example 3. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein. Based on the embodiments of the present invention described in the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0028] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details. In other instances, certain technical features well known in the art are not described to avoid confusion with the present invention.

[0029] It should be understood that the present invention can be implemented in different forms and should not be interpreted as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make disclosure thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0030] The purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present invention. When used herein, the singular forms "a", "an", and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0031] In order to fully understand the present invention, a detailed structure will be provided in the following description to illustrate the technical solution proposed by the present invention. Optional embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention may also have other implementations.

[0032] like Figure 1 As shown, a device for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current includes a data logger 4, a power supply 1, a voltage decomposer 2 and an electrical accessory 3. The power supply 1 is a programmable constant current power supply. The positive and negative poles of the power supply 1 are correspondingly connected to the electrical accessory 3. The voltage decomposer 2 is connected in parallel with the power supply 1. The voltage decomposer 2 is a battery whose open-circuit voltage is within the applicable voltage range of the power supply 1. The power supply 1 monitors the current passing through the electrical accessory 3 in real time. The voltage decomposer 2 feeds back the actual voltage of the voltage decomposer 2 to the power supply 1, thereby maintaining the constant current output by the power supply 1 to the electrical accessory 3. The electrical accessory 3 is provided with a temperature sensor. The data logger 4 collects temperature rise change data of the electrical accessory 3 through the temperature sensor.

[0033] In some embodiments, the voltage decomposer 2 uses a small-capacity, low-voltage battery or supercapacitor whose open-circuit voltage is less than the maximum applicable voltage of the power supply 1, wherein the small-capacity, low-voltage battery is preferably a lithium-ion battery, a sodium-ion battery or a lead-acid battery.

[0034] In some embodiments, the constant current output by the power supply 1 to the electrical accessory 3 is the limiting operating current of the electrical accessory 3. By detecting the temperature rise characteristics of the electrical accessory 3 under the limiting current, the limiting load boundary of the electrical accessory 3 can be clearly determined.

[0035] In some embodiments, the temperature rise data of multiple electrical accessories 3 can be tested simultaneously to improve testing efficiency. When testing multiple electrical accessories 3, the power supply 1 is connected to multiple electrical accessories 3 in series; the electrical accessories 3 may be high-voltage fuses, low-voltage fuses, disconnect switches, and / or transformers. Multiple electrical accessories 3 of the same type can be connected in series, or different electrical accessories 3 can be connected in series to the power supply 1, provided the output current does not exceed the current limit of the electrical accessory 3 being tested.

[0036] In some embodiments, the data logger 4 collects temperature data of the electrical accessory 3 once every 30n seconds, where n is a positive integer.

[0037] In a preferred embodiment, the power supply 1 adopts an Arbin-type battery testing system, which can provide low voltage and high current, making it easier to build a test circuit. In some other embodiments, the power supply 1 can also adopt other adjustable constant current power supplies with similar functions that can output low voltage and high current.

[0038] In some embodiments, an even number of the temperature sensors are symmetrically arranged on the geometrically symmetrical plane of the electrical accessory 3, and the accuracy of the temperature detection data is improved by multiple temperature sensors symmetrically arranged on the electrical accessory.

[0039] A method for evaluating the temperature rise characteristics of electrical accessories of energy storage systems under constant current is used. Figure 1 The power supply 1 and data logger 4 shown obtain the temperature rise change data of the electrical accessory 3 to be evaluated. The power supply 1 is connected in parallel with a voltage decomposer 2. The voltage decomposer 2 uses a small-capacity, low-voltage battery or supercapacitor whose open-circuit voltage is less than the maximum applicable voltage of the power supply 1. The power supply 1 is a programmable constant current power supply. The positive and negative poles of the power supply 1 are connected correspondingly to the electrical accessory 3. The power supply 1 monitors the current passing through the electrical accessory 3 in real time. The voltage decomposer 2 feeds back the actual voltage of the voltage decomposer 2 to the power supply 1, thereby maintaining the power supply 1 to output a constant limit working current of the electrical accessory 3. The electrical accessory 3 is provided with a temperature sensor. The data logger 4 collects the temperature rise change data of the electrical accessory 3 under its limit working current through the temperature sensor.

[0040] The power supply 1 uses an Arbin-type battery test system and is combined with a voltage resolver 2 to output low voltage and stable high current, thereby maintaining a constant maximum operating current output by the power supply 1 to the electrical accessory 3.

[0041] The following describes the testing process of the present invention through specific test cases:

[0042] Test Example 1:

[0043] The present invention is used to evaluate the temperature rise characteristics of a certain type of high-voltage fuse under a limiting current of 550A. The power supply 1 adopts an Arbin-type battery test system, the voltage resolver 2 adopts a lithium-ion battery with an open-circuit voltage of 3.2V, and two thermocouples are symmetrically arranged on the geometric symmetry plane of the high-voltage fuse. The following is obtained: Figure 2 The temperature rise characteristic curve of medium and high voltage fuses and the actual monitoring current passing through the high voltage fuses are shown in Table 1:

[0044] Table 1 Current monitoring data of high voltage fuse during 550A current temperature rise characteristic test

[0045]

[0046]

[0047] Test Example 2:

[0048] The present invention is used to evaluate the temperature rise characteristics of a certain type of low-voltage fuse under a limiting current of 350A. The power supply 1 adopts an Arbin-type battery test system, the voltage resolver 2 adopts a sodium ion battery with an open-circuit voltage of 2.8V, and two thermocouples are symmetrically arranged on the geometric symmetry plane of the low-voltage fuse. The following is obtained: Figure 3 The temperature rise characteristic curves of medium and low voltage fuses and the actual monitoring current passing through the low voltage fuses are shown in Table 2:

[0049] Table 2 Current monitoring data of low voltage fuse during 350A current temperature rise characteristic test

[0050] Power-on time (s) Current (A) 60.0005 349.9914 120.0001 349.9935 180.0009 349.9946 240.0004 349.9944 300.0001 350.0026 360.0009 350.0012 … … 1080.0004 350.0023 1140.0003 350.0062 1200.0010 350.0036 1260.0003 350.0026 1320.0006 349.9984 1380.0008 350.0014 1440.0010 350.0048 1500.0007 350.0015 … … 5220.0005 350.0040 5280.0006 350.0147 5340.0001 350.0110 5400.0003 349.9905 5460.0000 349.9913 5520.0000 349.9905 … … 6960.0006 350.0027 7020.0007 350.0017 7080.0003 350.0051 7140.0009 350.0028 7200.0001 350.0062 7260.0001 350.0027 7320.0000 350.0117 7380.0010 349.9963 7440.0000 349.9901 7476.9891 349.9940

[0051] Test Example 3:

[0052] The present invention is used to evaluate the temperature rise characteristics of a certain type of isolating switch under a limiting current of 400A. The power supply 1 adopts an Arbin-type battery test system, the voltage resolver 2 adopts a supercapacitor with an open circuit voltage of 3.3V and 3F, and two thermocouples are symmetrically arranged on the geometric symmetry plane of the isolating switch. The following is obtained: Figure 4 The temperature rise characteristic curve of the isolating switch and the actual monitoring current passing through the isolating switch are shown in Table 3:

[0053] Table 3 Current monitoring data of the isolating switch during the 400A current temperature rise characteristic test

[0054]

[0055]

[0056] Experiments have shown that using the voltage resolver of the present invention to feed back the actual voltage of the voltage resolver to the power supply can maintain a constant limiting current output by the power supply to the electrical accessory. Testing the temperature rise characteristic curve of the electrical accessory using a stable constant limiting current can clarify the maximum load limit of the electrical accessory, allowing for more suitable service environments and systems for electrical accessories such as fuses, thereby safeguarding the high-quality development of energy storage systems.

[0057] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A device for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current, comprising a power supply, a data acquisition instrument, and the electrical accessories to be evaluated, characterized in that: It also includes a voltage decomposer, which is connected in parallel with the power supply. The voltage decomposer is a battery whose open-circuit voltage is within the applicable voltage range of the power supply. The power supply is a programmable constant current power supply. The positive and negative poles of the power supply are correspondingly connected to the electrical accessory. The power supply monitors the current passing through the electrical accessory in real time. The voltage decomposer feeds back the actual voltage of the voltage decomposer to the power supply, thereby maintaining a constant current output by the power supply to the electrical accessory. The electrical accessory is provided with a temperature sensor, and the data acquisition instrument collects temperature rise change data of the electrical accessory through the temperature sensor.

2. The method for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current according to claim 1, characterized in that: The voltage decomposer uses a small-capacity, low-voltage battery or supercapacitor whose open-circuit voltage is less than the maximum applicable voltage of the power supply. The small-capacity, low-voltage battery uses a lithium-ion battery, a sodium-ion battery or a lead-acid battery.

3. The method for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current according to claim 1, characterized in that: The constant current output by the power supply to the electrical accessory is the limiting operating current of the electrical accessory.

4. The device for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current according to claim 1, characterized in that: The power supply is connected to a plurality of electrical accessories connected in series; the electrical accessories are high-voltage fuses, low-voltage fuses, isolating switches and / or transformers.

5. The device for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current according to claim 1, characterized in that: The data acquisition instrument collects the temperature data of the electrical accessory once every 30n seconds, where n is a positive integer.

6. The device for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current according to any one of claims 1 to 5, characterized in that: The power supply adopts Arbin type battery test system.

7. The device for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current according to any one of claims 1 to 5, characterized in that: An even number of the temperature sensors are symmetrically arranged on the geometric symmetry plane of the electrical accessory.

8. The device for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current according to claim 7, characterized in that: The temperature sensor is a thermocouple temperature sensor.

9. A method for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current, using a power supply and a data acquisition instrument to obtain temperature rise change data of the electrical accessories to be evaluated, characterized by: A voltage decomposer is connected in parallel to the power supply, and the voltage decomposer adopts a small-capacity, low-voltage battery or supercapacitor whose open-circuit voltage is less than the maximum applicable voltage of the power supply. The power supply is a programmable constant-current power supply, and the positive and negative poles of the power supply are correspondingly connected to the electrical accessory. The power supply monitors the current passing through the electrical accessory in real time, and the voltage decomposer feeds back the actual voltage of the voltage decomposer to the power supply, thereby maintaining the power supply outputting a constant limiting working current of the electrical accessory to the electrical accessory. The electrical accessory is provided with a temperature sensor, and the data acquisition instrument collects temperature rise change data of the electrical accessory under its limiting working current through the temperature sensor.

10. The method for evaluating the temperature rise characteristics of electrical accessories of an energy storage system under constant current according to claim 9, characterized in that: The power supply adopts Arbin type battery test system.

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