A device and method for evaluating temperature rise characteristics of an energy storage system electrical accessory under constant current

Abstract

The application discloses a device and method for evaluating temperature rise characteristics of an energy storage system electrical accessory under constant current, and adopts a power supply and a data acquisition instrument to obtain temperature rise change data of the electrical accessory to be evaluated; a voltage resolver is connected in parallel to the power supply; the voltage resolver adopts a small-capacity and low-voltage battery or super capacitor with an open circuit voltage 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 connected to the electrical accessory in correspondence; the power supply monitors the current passing through the electrical accessory in real time; the voltage resolver feeds back the actual voltage of the voltage resolver to the power supply, so that the power supply outputs constant working current 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 the limit working current through the temperature sensor. The application can provide stable constant current for the electrical accessory during the test, and improve the data precision of the test temperature rise.

Description

Technical Field

[0001] This invention relates to an apparatus and method for evaluating the temperature rise characteristics of electrical accessories in an energy storage system under constant current. Background Technology

[0002] Electrical accessories are a crucial component of energy storage systems, and their temperature rise characteristics significantly impact the system's safety. Take fuses as an example: their primary function is to break the circuit when a fault or abnormality occurs, as the current rises. The increased current in the circuit can damage critical or valuable components, burn out the circuit, or even cause a fire. If fuses are correctly installed, they will melt and break the current when it abnormally rises to a certain level, thus protecting the circuit's safe operation. Therefore, evaluating the temperature rise characteristics of fuses and other electrical accessories allows for the matching of more suitable service environments and systems, ensuring the high-quality development of energy storage systems.

[0003] Chinese patent CN105425143A discloses "A fuse temperature testing device and testing method", which evaluates the temperature rise characteristics of the fuse by detecting the temperature of the glycerin bath. However, this method is complicated to operate, has low adaptability, and the test data is delayed.

[0004] Chinese patent 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 testing device is relatively complex, the testing operation steps are cumbersome, and the accuracy of current control is also insufficient.

[0005] The temperature rise tests of existing fuses described above only reflect the temperature rise characteristics of fuses and other electrical accessories under constant power, and cannot reflect the temperature rise characteristics of electrical accessories under limiting current. New energy storage is an important technology and basic equipment for building new power systems. With the rapid development of power energy storage facilities, the study of the various temperature rise characteristics of electrical accessories in different service environments is of great significance, as they are an important component of energy storage systems.

[0006] In current technology, constant current power supplies are mainly used in fields requiring strict current control, such as LED driving, battery charging, and sensor power supply, and can generally only provide a stable small current. Temperature rise testing of electrical accessories in energy storage systems requires low voltage and high current, such as 0-5V and 300A or more of current. Therefore, conventional constant current power supplies cannot provide the high current required for temperature rise testing of electrical accessories. Summary of the Invention

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

[0008] The technical solution adopted for one of the objectives of this invention is as follows:

[0009] An apparatus for evaluating the temperature rise characteristics of electrical accessories in an energy storage system under constant current includes a power supply, a data acquisition instrument, and the electrical accessory to be evaluated. It is characterized by further including a voltage resolver connected in parallel with the power supply. The voltage resolver is a battery with an open-circuit voltage within the applicable voltage range of the power supply. The power supply is a programmable constant current power supply, with its positive and negative terminals connected to the electrical accessory respectively. The power supply monitors the current flowing through the electrical accessory in real time. The voltage resolver feeds back its actual voltage to the power supply, thereby maintaining a constant current output from the power supply to the electrical accessory. The electrical accessory is equipped with a temperature sensor, and the data acquisition instrument collects temperature rise change data of the electrical accessory through the temperature sensor.

[0010] This invention establishes a test circuit capable of outputting a constant high current. It employs a programmable constant current power supply connected to a voltage resolver composed of batteries. The voltage resolver feeds back its actual voltage to the power supply, and the feedback voltage provided by the voltage resolver maintains the constant current output.

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

[0012] In a preferred embodiment of the present invention, the constant current output by the power source to the electrical accessory is the limit operating current of the electrical accessory. By detecting the temperature rise characteristics of the electrical accessory under the limit current, the limit load-carrying boundary of the electrical accessory can be clearly defined, thereby providing theoretical support for the design and construction of the electrical circuit of the energy storage system.

[0013] This 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 include high-voltage fuses, low-voltage fuses, disconnect switches, and / or transformers, etc. Multiple identical electrical accessories 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 upper limit of the current of the electrical accessory under test.

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

[0015] The power supply described in this invention uses an Arbin-type battery testing system, which can provide low voltage and high current, making the construction of the test circuit simpler. The power supply can also be other adjustable constant current power supplies with similar functions that can output low voltage and high current.

[0016] An even number of temperature sensors are symmetrically arranged on the geometric symmetry plane of the electrical accessory of the present invention, thereby improving the accuracy of temperature detection data through multiple symmetrically arranged temperature sensors on the electrical accessory.

[0017] The temperature sensor described in this invention is a thermocouple temperature sensor.

[0018] The second objective of this invention is to provide a method for evaluating the temperature rise characteristics of electrical accessories in an energy storage system under constant current. This method employs a power supply and a data acquisition instrument to acquire temperature rise change data of the electrical accessory to be evaluated. A voltage resolver is connected in parallel to the power supply. The voltage resolver uses a small-capacity, low-voltage battery or supercapacitor with an open-circuit voltage lower than the maximum applicable voltage of the power supply. The power supply is a programmable constant current power supply, with its positive and negative terminals connected to the corresponding electrical accessories. The power supply monitors the current flowing through the electrical accessory in real time. The voltage resolver feeds back its actual voltage to the power supply, thereby maintaining a constant output current to the electrical accessory that is the limit of its operating current. The electrical accessory is equipped with a temperature sensor, and the data acquisition instrument collects temperature rise change data of the electrical accessory under its limit operating current through the temperature sensor.

[0019] The power supply employs an Arbin-type battery testing system, coupled with the voltage decomposer of this invention, to output low voltage and stable high current. This maintains a constant output current to the electrical accessory, matching the accessory's operating limit.

[0020] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0021] 1. This invention innovatively proposes a device for testing the temperature rise characteristics of electrical accessories in energy storage systems under extreme operating current using a constant high current, filling a gap in this field. By detecting the temperature rise characteristics of electrical accessories under extreme current, the extreme load-bearing boundary of electrical accessories can be clearly defined, thereby providing theoretical support for the design and construction of electrical circuits in energy storage systems. This, in turn, allows for matching electrical accessories with more suitable service environments and systems, improving the safety and service life of energy storage systems.

[0022] 2. This invention provides a low-voltage, high-current test circuit that can continuously and stably output a large current to electrical accessories. The test circuit is simple and 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 test the temperature rise characteristics of multiple electrical accessories, resulting in a wide range of applications and high testing efficiency. Attached Figure Description

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

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

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

[0026] Figure 4 The temperature rise characteristic diagram of the disconnecting switch in Test Example 3 is shown. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the present invention more apparent, exemplary embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of the present invention, and not all of the embodiments of the present invention. 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 herein, all other embodiments obtained by those skilled in the art without inventive effort should fall within the protection scope of the present invention.

[0028] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0029] It should be understood that the invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0030] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0031] To fully understand this invention, a detailed structure will be presented in the following description to illustrate the technical solution proposed by this invention. Optional embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0032] like Figure 1 As shown, a device for evaluating the temperature rise characteristics of electrical accessories in an energy storage system under constant current includes a data acquisition instrument 4, a power supply 1, a voltage decomposer 2, and electrical accessories 3. The power supply 1 is a programmable constant current power supply, and the positive and negative terminals of the power supply 1 are connected to the electrical accessories 3 respectively. The voltage decomposer 2 is connected in parallel with the power supply 1 and 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 accessories 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 a constant current output from the power supply 1 to the electrical accessories 3. The electrical accessories 3 are equipped with a temperature sensor, and the data acquisition instrument 4 collects the temperature rise change data of the electrical accessories 3 through the temperature sensor.

[0033] In some embodiments, the voltage decomposer 2 uses a small-capacity, low-voltage battery or supercapacitor with an open-circuit voltage less than the maximum applicable voltage of the power supply 1. 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 limit operating current of the electrical accessory 3. By detecting the temperature rise characteristics of the electrical accessory 3 under the limit current, the limit load boundary of the electrical accessory 3 can be determined.

[0035] In some embodiments, the temperature rise data of multiple electrical accessories 3 can be tested simultaneously, improving testing efficiency. When testing multiple electrical accessories 3, the power supply 1 is connected to multiple electrical accessories 3 connected in series; the electrical accessories 3 are high-voltage fuses, low-voltage fuses, disconnect switches, and / or transformers, etc. Multiple of the same type of electrical accessory 3 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 upper limit of the current of the electrical accessory 3 under test.

[0036] In some embodiments, the data acquisition instrument 4 acquires the temperature data of the primary electrical accessory 3 at intervals of 30n seconds, where n is a positive integer.

[0037] In a preferred embodiment, power supply 1 uses an Arbin-type battery testing system, which can provide low voltage and high current, making it easier to build the test circuit. In other embodiments, power supply 1 can also use 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 temperature sensors are symmetrically arranged on the geometric symmetry plane of the electrical accessory 3. The accuracy of temperature detection data is improved by using multiple symmetrically arranged temperature sensors on the electrical accessory. Thermocouple temperature sensors may be used as the temperature sensors.

[0039] A method for evaluating the temperature rise characteristics of electrical accessories in an energy storage system under constant current, using methods such as... Figure 1 The power supply 1 and data acquisition instrument 4 are shown to acquire temperature rise data of the electrical accessory 3 to be evaluated. A voltage decomposer 2 is connected in parallel to the power supply 1. The voltage decomposer 2 uses a small-capacity, low-voltage battery or supercapacitor with an open-circuit voltage lower 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 terminals of the power supply 1 are connected to the electrical accessory 3 respectively. 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 operating current of the electrical accessory to the electrical accessory 3. The electrical accessory 3 is equipped with a temperature sensor. The data acquisition instrument 4 collects the temperature rise data of the electrical accessory 3 under its limit operating current through the temperature sensor.

[0040] The power supply 1 uses an Arbin-type battery testing system, in conjunction with a voltage decomposer 2, to output low voltage and stable high current. This maintains a constant output current from the power supply 1 to the electrical accessory 3, which is the accessory's maximum operating current.

[0041] The testing process of this invention is illustrated below through specific test cases:

[0042] Test Example 1:

[0043] This invention was used to evaluate the temperature rise characteristics of a certain type of high-voltage fuse under a 550A limiting current. Power supply 1 used an Arbin-type battery testing system, voltage decomposer 2 used a lithium-ion battery with an open-circuit voltage of 3.2V, and two thermocouples were symmetrically arranged on the geometric symmetry plane of the high-voltage fuse. The results are as follows: Figure 2 The temperature rise characteristic curves of medium and high voltage fuses and the actual monitoring current through high voltage fuses are shown in Table 1.

[0044] Table 1 Current monitoring data of high-voltage fuses during the 550A current-temperature rise characteristic test.

[0045]

[0046]

[0047] Test Example 2:

[0048] This invention was used to evaluate the temperature rise characteristics of a certain type of low-voltage fuse under a 350A limiting current. Power supply 1 used an Arbin-type battery testing system, voltage decomposer 2 used a sodium-ion battery with an open-circuit voltage of 2.8V, and two thermocouples were symmetrically arranged on the geometric symmetry plane of the low-voltage fuse. The results are as follows: Figure 3 The temperature rise characteristic curves of medium and low voltage fuses and the actual monitoring current through the low voltage fuses are shown in Table 2.

[0049] Table 2 Current monitoring data of low-voltage fuses during the 350A current-temperature rise characteristic test.

[0050] 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] This invention was used to evaluate the temperature rise characteristics of a certain type of disconnecting switch under a 400A limiting current. Power supply 1 used an Arbin-type battery testing system, voltage decomposer 2 used a 3.3V, 3F supercapacitor, and two thermocouples were symmetrically arranged on the geometric symmetry plane of the disconnecting switch. The results are as follows: Figure 4 The temperature rise characteristic curve of the disconnecting switch and the actual monitoring current through the disconnecting switch are shown in Table 3:

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

[0054]

[0055]

[0056] Experiments show that by using the voltage resolver of this invention to feed back the actual voltage of the voltage resolver to the power source, a constant limiting current can be maintained by the power source outputting to the electrical accessory. By testing the temperature rise characteristic curve of the electrical accessory with a stable constant limiting current, the ultimate load-bearing boundary of the electrical accessory can be clearly defined, allowing for the matching of more suitable service environments and systems for electrical accessories such as fuses, thus 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 these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A device for evaluating the temperature rise characteristics of electrical accessories in 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 resolver connected in parallel with the power supply. The voltage resolver 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 for providing low voltage and high current. The positive and negative terminals of the power supply are connected to the electrical accessory. The power supply monitors the current passing through the electrical accessory in real time. The voltage resolver feeds back its actual voltage to the power supply, thereby maintaining a constant current output from the power supply to the electrical accessory. The electrical accessory is equipped with a temperature sensor, and the data acquisition instrument collects the temperature rise change data of the electrical accessory through the temperature sensor.

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

3. The apparatus for evaluating the temperature rise characteristics of electrical accessories in an energy storage system under constant current, as described in claim 1, is characterized in that: The constant current output by the power source to the electrical accessory is the limit operating current of the electrical accessory.

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

5. The apparatus for evaluating the temperature rise characteristics of electrical accessories in 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 every 30n seconds, where n is a positive integer.

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

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

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

9. A method for evaluating the temperature rise characteristics of electrical accessories in an energy storage system under constant current, comprising using a power supply and a data acquisition instrument to obtain temperature rise change data of the electrical accessories to be evaluated, characterized in that: A voltage resolver is connected in parallel to the power supply. The voltage resolver uses a small-capacity, low-voltage battery or supercapacitor with an open-circuit voltage lower than the maximum applicable voltage of the power supply. The power supply is a programmable constant current power supply for providing low voltage and high current. The positive and negative terminals of the power supply are connected to the electrical accessory. The power supply monitors the current passing through the electrical accessory in real time. The voltage resolver feeds back its actual voltage to the power supply, thereby maintaining a constant output current to the electrical accessory that is the limit of its operating current. The electrical accessory is equipped with a temperature sensor, and the data acquisition instrument collects the temperature rise data of the electrical accessory under its limit operating current through the temperature sensor.

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

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