A nuclear power plant battery discharge testing device, system, and method

Abstract

The present application relates to a kind of nuclear power station battery discharge test device, system and method, comprising: interface unit, charging circuit, discharge circuit and energy storage unit;Interface unit is connected by switchboard the discharge circuit of lead-acid battery, charging circuit is connected interface unit and energy storage unit respectively, discharge circuit is connected interface unit and energy storage unit connection respectively;Lead-acid battery is discharged when carrying out test, charging circuit is on, discharge circuit is disconnected, and the electric energy released by lead-acid battery is sequentially charged to energy storage unit through interface unit and charging circuit;After lead-acid battery discharge test is finished, charging circuit is disconnected, and discharge circuit is on, and energy storage unit is exported to the equipment to be overhauled by discharge circuit, interface unit electrical energy.The present application stores the energy generated by battery discharge test and powers the maintenance tool, reduces the fire risk caused by the release of a large amount of heat during battery discharge test, improves safety, and increases economy.

Description

Technical Field

[0001] This invention relates to the field of periodic testing of batteries in nuclear power plants, and more specifically, to a discharge testing apparatus, system, and method for nuclear power plant batteries. Background Technology

[0002] The DC system batteries in nuclear power plants serve as the last emergency power source after the loss of AC power. These batteries are designed to discharge for one hour, meaning they can supply power to downstream loads for at least one hour after AC power loss. Batteries are crucial for emergency response after nuclear power plant accidents. During major overhauls of each unit, battery discharge tests are conducted to verify their ability to supply power to downstream loads for one hour under emergency conditions. Currently, the test equipment used for discharge tests consists of purely consumable loads that cannot store discharge energy, resulting in energy waste. Furthermore, battery discharge generates significant heat over a prolonged period, leading to high temperatures in the discharge circuit cables and equipment, posing a fire risk. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a nuclear power plant battery discharge test device, system and method to address the problems existing in the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problem is: to construct a nuclear power plant battery discharge test device, including: an interface unit, a charging circuit, a discharging circuit and an energy storage unit; The interface unit is connected to the discharge circuit of the lead-acid battery through the distribution panel. The charging circuit is connected to the interface unit and the energy storage unit respectively. The discharge circuit is connected to the interface unit and the energy storage unit respectively, and the discharge circuit is also connected to the charging circuit. When the lead-acid battery is subjected to a discharge test, the charging circuit is turned on and the discharge circuit is turned off. The electrical energy released by the lead-acid battery is used to charge the energy storage unit in sequence through the interface unit and the charging circuit. After the lead-acid battery discharge test is completed, the charging circuit is disconnected and the discharge circuit is connected. The energy storage unit outputs electrical energy to the equipment under maintenance through the discharge circuit and the interface unit.

[0005] In the nuclear power plant battery discharge test device of the present invention, the interface unit includes: a first interface and a second interface; The first interface is connected to the charging circuit and is used to receive the electrical energy released by the lead-acid battery when the lead-acid battery is discharging. The second interface is connected to the discharge circuit and is used to transmit the electrical energy output by the energy storage unit to the equipment under maintenance.

[0006] In the nuclear power plant battery discharge test device of the present invention, the charging circuit includes: a first switch, a charging conversion module and a third switch; The input terminal of the first switch is connected to the first interface, the output terminal of the first switch is connected to the input terminal of the charging conversion module, the output terminal of the charging conversion module is connected to the input terminal of the third switch, and the output terminal of the third switch is connected to the energy storage unit.

[0007] In the nuclear power plant battery discharge test device of the present invention, the charging conversion module is a DC / DC converter used to convert the DC power released by the lead-acid battery into DC power.

[0008] In the nuclear power plant battery discharge test device of the present invention, the discharge circuit includes: a second switch, a discharge conversion module and a fourth switch; The output terminal of the second switch is connected to the second interface, the input terminal of the second switch is connected to the output terminal of the discharge conversion module, the input terminal of the discharge conversion module is connected to the output terminal of the fourth switch, and the input terminal of the fourth switch is connected to the energy storage unit.

[0009] In the nuclear power plant battery discharge test device of the present invention, the discharge conversion module is a DC / AC converter, which is used to convert the DC power output by the energy storage unit into AC power.

[0010] In the nuclear power plant battery discharge test device of the present invention, the third switch and the fourth switch are provided with a mechanical interlocking device.

[0011] In the nuclear power plant battery discharge test device described in this invention, the energy storage unit is a lithium iron phosphate battery energy storage system; The first switch, the second switch, the third switch, and the fourth switch are all circuit breakers.

[0012] The present invention also provides a nuclear power plant battery discharge test system, comprising: a lead-acid battery, a distribution panel, a discharge switch installed on the distribution panel, a discharge test monitoring device, and the nuclear power plant battery discharge test device described above. The lead-acid battery is connected to the distribution panel via a cable, and the discharge switch is connected to the nuclear power plant battery discharge test device via a cable. When the lead-acid battery is subjected to a discharge test, the discharge switch is closed, and the electrical energy released by the lead-acid battery is transmitted to the nuclear power plant battery discharge test device through the discharge switch; the discharge test monitoring device is used to monitor the discharge status of the lead-acid battery in real time.

[0013] This invention also provides a method for testing the discharge of a nuclear power plant battery, applied to the aforementioned nuclear power plant battery discharge testing system, comprising the following steps: Connect the discharge circuit of the lead-acid battery to the distribution panel; The distribution panel is connected to the nuclear power plant battery discharge test device via a cable. Close the discharge switch on the aforementioned distribution panel; Connect the charging circuit of the nuclear power plant battery discharge test device, and at the same time control the discharge circuit of the nuclear power plant battery discharge test device to remain disconnected; When the discharge test begins, the electrical energy released by the lead-acid battery is discharged to the nuclear power plant battery discharge test device through the discharge switch, and the nuclear power plant battery discharge test device is in a charging state. After the lead-acid battery has finished discharging, the charging circuit of the nuclear power plant battery discharge test device is disconnected. The discharge switch is controlled to open; Disconnect the cable connecting the nuclear power plant battery discharge test device to the switchboard.

[0014] The nuclear power plant battery discharge test apparatus, system, and method of the present invention have the following beneficial effects: It includes an interface unit, a charging circuit, a discharging circuit, and an energy storage unit. The interface unit is connected to the discharge circuit of the lead-acid battery via a distribution panel. The charging circuit is connected to both the interface unit and the energy storage unit, and the discharging circuit is connected to both the interface unit and the energy storage unit. During the discharge test, the charging circuit is on and the discharging circuit is off, allowing the released electrical energy from the lead-acid battery to charge the energy storage unit sequentially through the interface unit and the charging circuit. After the lead-acid battery discharge test is completed, the charging circuit is off and the discharging circuit is on, allowing the energy storage unit to output electrical energy to the equipment under maintenance through the discharging circuit and the interface unit. This invention stores the energy generated during the battery discharge test and uses it to power maintenance tools, reducing the fire risk caused by the large amount of heat released during the battery discharge test, thus improving both safety and economy. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a functional block diagram of the nuclear power plant battery discharge test device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the nuclear power plant battery discharge test device provided in an embodiment of the present invention; Figure 3 This is a logic block diagram of the nuclear power plant battery discharge test system provided in an embodiment of the present invention; Figure 4This is a schematic flowchart of Embodiment 1 of the nuclear power plant battery discharge test method provided by the present invention; Figure 5 This is a schematic flowchart of Embodiment 2 of the nuclear power plant battery discharge test method provided in this invention. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] To address the problem that all discharge energy during lead-acid battery discharge tests in nuclear power plants is consumed by the test load, resulting in energy waste and potential fire risks, this invention provides a nuclear power plant battery discharge test device. This device can store the energy generated by the battery during discharge tests, and the stored energy can be used for subsequent maintenance work. This simultaneously solves the fire risk caused by the release of large amounts of heat during discharge and avoids energy waste.

[0018] refer to Figure 1 , Figure 1 A preferred embodiment of the nuclear power plant battery discharge test apparatus provided by the present invention is shown.

[0019] Specifically, such as Figure 1As shown, the nuclear power plant battery discharge test device includes: an interface unit 101, a charging circuit 102, a discharge circuit 103, and an energy storage unit 104. The interface unit 101 is connected to the discharge circuit of the lead-acid battery via a distribution panel. The charging circuit 102 is connected to both the interface unit 101 and the energy storage unit 104. The discharge circuit 103 is also connected to both the interface unit 101 and the energy storage unit 104, and is also connected to the charging circuit 102. During the discharge test, the charging circuit 102 is turned on and the discharge circuit 103 is turned off. The electrical energy released by the lead-acid battery charges the energy storage unit 104 sequentially through the interface unit 101 and the charging circuit 102. After the lead-acid battery discharge test is completed, the charging circuit 102 is turned off and the discharge circuit 103 is turned on. The energy storage unit 104 outputs electrical energy to the equipment under maintenance through the discharge circuit 103 and the interface unit 101. By storing the electrical energy released by the lead-acid battery through the energy storage unit 104, the risk of fire caused by overheating of the discharge circuit cables and discharge devices due to continuous discharge can be avoided. Furthermore, during subsequent maintenance, the stored energy can be released to the equipment under maintenance through the energy storage unit 104, thus avoiding energy waste and improving the economic efficiency and safety of the power plant.

[0020] In this embodiment of the invention, when the lead-acid battery is being discharged, the nuclear power plant battery discharge test device acts as an energy storage device; after the lead-acid battery discharge test is completed, the nuclear power plant battery discharge test device can be used as a maintenance power source to provide power to the equipment to be maintained.

[0021] Preferably, in some embodiments, the interface unit 101 includes a first interface 1011 and a second interface 1012. The first interface 1011 is connected to the charging circuit 102 and is used to receive the electrical energy released by the lead-acid battery during discharge. The second interface 1012 is connected to the discharge circuit 103 and is used to transmit the electrical energy output from the energy storage unit 104 to the device under maintenance. In this embodiment, the first interface 1011 and the second interface 1012 are separately configured. The first interface 1011 is connected to the distribution panel via a cable, and then connected to the discharge circuit of the lead-acid battery via the distribution panel. The second interface 1012 is connected to the device under maintenance via a cable, or the plug of the device under maintenance can be directly connected to the second interface 1012.

[0022] Preferably, in some embodiments, the charging circuit 102 includes: a first switch 1021, a charging conversion module 1022, and a third switch 1023; the input terminal of the first switch 1021 is connected to the first interface 1011, the output terminal of the first switch 1021 is connected to the input terminal of the charging conversion module 1022, the output terminal of the charging conversion module 1022 is connected to the input terminal of the third switch 1023, and the output terminal of the third switch 1023 is connected to the energy storage unit 104. When the lead-acid battery performs a discharge test, the first interface 1011, the first switch 1021, the charging conversion module 1022, and the third switch 1023 constitute the charging circuit 102 of the energy storage unit 104, and the electrical energy released by the lead-acid battery flows into the energy storage unit 104 sequentially through the first interface 1011, the first switch 1021, the charging conversion module 1022, and the third switch 1023.

[0023] Preferably, in some embodiments, the charging conversion module 1022 is a DC / DC converter (i.e., a DC-to-DC converter) used to convert the DC power released by the lead-acid battery into DC power. Through this DC / DC converter, the DC power released by the lead-acid battery can be directly converted into DC power suitable for the energy storage unit 104, thereby charging the energy storage unit 104 and realizing the storage of the electrical energy released by the lead-acid battery.

[0024] Preferably, in some embodiments, the discharge circuit 103 includes: a second switch 1031, a discharge conversion module 1032, and a fourth switch 1033; the output terminal of the second switch 1031 is connected to the second interface 1012, the input terminal of the second switch 1031 is connected to the output terminal of the discharge conversion module 1032, the input terminal of the discharge conversion module 1032 is connected to the output terminal of the fourth switch 1033, and the input terminal of the fourth switch 1033 is connected to the energy storage unit 104. When the nuclear power plant battery discharge test device is used as a maintenance power source (at this time, the first interface 1011 has been disconnected from the lead-acid battery discharge circuit), the second interface 1012, the second switch 1031, the discharge conversion module 1032, and the fourth switch 1033 constitute the discharge circuit 103 of the energy storage unit 104. The energy storage unit 104 outputs electrical energy, and the output electrical energy is sequentially output to the equipment under maintenance through the fourth switch 1033, the discharge conversion module 1032, the second switch 1031, and the second interface 1012.

[0025] Preferably, in some embodiments, the discharge conversion module 1032 is a DC / AC converter (i.e., a direct current to alternating current conversion device) used to convert the direct current output from the energy storage unit 104 into alternating current. Through this DC / AC converter, the direct current released by the energy storage unit 104 can be directly converted into alternating current suitable for the equipment under maintenance, thereby converting the energy generated by the lead-acid battery discharge test into the electrical energy required for the nuclear power plant maintenance tools. This reduces the fire risk caused by the large amount of heat released during battery discharge tests, while utilizing the discharge energy, thus increasing both safety and economy. Here, the equipment under maintenance referred to in this invention is the maintenance tool in a nuclear power plant.

[0026] Furthermore, in this embodiment of the invention, the third switch 1023 and the fourth switch 1033 are provided with a mechanical interlocking device. By providing a mechanical interlocking device between the third switch 1023 and the fourth switch 1033, it is possible to prevent the third switch 1023 and the fourth switch 1033 from closing simultaneously, thus preventing mutual interference between the DC / DC converter and the DC / AC converter, and improving the reliability and stability of the system.

[0027] Preferably, in this embodiment of the invention, the energy storage unit 104 is a lithium iron phosphate battery energy storage system. In this embodiment of the invention, the first switch 1021, the second switch 1031, the third switch 1023, and the fourth switch 1033 are all circuit breakers. Under normal operating conditions, the first switch 1021, the second switch 1031, the third switch 1023, and the fourth switch 1033 perform opening and closing functions, and can provide tripping protection in case of a fault.

[0028] refer to Figure 2 , Figure 2 The structure of the nuclear power plant battery discharge test device provided by the present invention is shown. Figure 2 In this configuration, 001JA is the first switch 1021, 002JA is the second switch 1031, 003JA is the third switch 1023, and 004JA is the fourth switch 1033. Interface #1 is the first interface 1011, and interface #1 DC / DC is the charging conversion module 1022 (DC to DC conversion device). Interface #2 is the second interface 1012, and interface #2 DC / AC is the discharging conversion module 1032 (DC to AC conversion device). 001BT is the lithium iron phosphate battery energy storage system. Interfaces #1 DC / DC and #1 AC / AC are controlled by the control system.

[0029] Its specific working principle is as follows, such as Figure 2 As shown: When a lead-acid battery discharges: The 001BT lithium iron phosphate battery energy storage system is not fully charged. The lead-acid battery charges the 001BT through 001JA, 1# DC / DC, and 003JA. At this time, 004JA is disconnected.

[0030] After the discharge is completed: The nuclear power plant battery discharge test device can be used as a maintenance power source. The energy stored in 001BT is released through 004JA, 2#DC / AC, and 002JA for equipment maintenance. At this time, 003JA is disconnected.

[0031] There is a mechanical interlocking device between 003JA and 004JA to prevent 003JA and 004JA from closing at the same time, which would cause mutual interference between DC / DC and DC / AC.

[0032] refer to Figure 3 , Figure 3 A preferred embodiment of the nuclear power plant battery discharge test system provided by the present invention is shown.

[0033] Specifically, such as Figure 3 As shown, the nuclear power plant battery discharge test system includes: a lead-acid battery, a distribution panel, a discharge switch installed on the distribution panel, a discharge test monitoring device, and the nuclear power plant battery discharge test device disclosed in this embodiment of the invention.

[0034] The lead-acid battery is connected to the distribution panel via a cable, and the discharge switch is connected to the nuclear power plant's battery discharge test device via a cable. When the lead-acid battery is subjected to a discharge test, the discharge switch is closed, and the electrical energy released by the lead-acid battery is transmitted to the nuclear power plant's battery discharge test device through the discharge switch. The discharge test monitoring device is used to monitor the discharge status of the lead-acid battery in real time. Specifically, the discharge circuit of the lead-acid battery is connected to the distribution panel via a cable, and the distribution panel is then connected to the nuclear power plant's battery discharge test device. The discharge switch on the distribution panel is used to control the on / off connection between the lead-acid battery and the nuclear power plant's battery discharge test device.

[0035] In this embodiment of the invention, the discharge test monitoring device can be a temporary monitoring device set up on-site when a lead-acid battery in a nuclear power plant is subjected to a discharge test. Existing equipment can be used, and the invention does not impose specific limitations. During monitoring, when the average voltage of a single lead-acid battery cell is 1.86V or the lowest voltage of a single cell reaches 1.80V, it is determined that the discharge conditions of the lead-acid battery are met. When the discharge conditions are met, the discharge is terminated.

[0036] This invention stores the electrical energy released by lead-acid batteries using a nuclear power plant battery discharge test device, thus avoiding the fire risk caused by overheating of the lead-acid battery discharge circuit cables and discharge device due to continuous discharge. Furthermore, during subsequent maintenance, the stored energy can be released to the equipment under maintenance by the energy storage unit 104, thereby avoiding energy waste and improving the economic efficiency and safety of the power plant.

[0037] refer to Figure 4 , Figure 4 The flowchart of the nuclear power plant battery discharge test method provided by the present invention is shown. This nuclear power plant battery discharge test method is applied to the nuclear power plant battery discharge test system disclosed in the embodiments of the present invention.

[0038] Specifically, such as Figure 4 As shown, the battery discharge test method for this nuclear power plant includes the following steps: Step S401: Connect the discharge circuit of the lead-acid battery to the distribution panel.

[0039] Step S402: Connect the switchboard to the nuclear power plant battery discharge test device via a cable.

[0040] Step S403: Close the discharge switch on the distribution panel.

[0041] Step S404: Connect the charging circuit 102 of the nuclear power plant battery discharge test device, while keeping the discharge circuit 103 of the nuclear power plant battery discharge test device disconnected.

[0042] Step S405: When the discharge test begins, the electrical energy released by the lead-acid battery is discharged to the nuclear power plant battery discharge test device through the discharge switch, and the nuclear power plant battery discharge test device is in a charging state.

[0043] Step S406: After the lead-acid battery discharge is completed, the charging circuit 102 of the control nuclear power plant battery discharge test device is disconnected.

[0044] Step S407: Control the discharge switch to open.

[0045] Step S408: Disconnect the cable connecting the nuclear power plant battery discharge test device to the switchboard.

[0046] Furthermore, such as Figure 5 As shown, in another embodiment, the nuclear power plant battery discharge test method includes the following steps: Step S501: Connect the plug of the equipment to be inspected to the nuclear power plant battery discharge test device; Step S502: Set the parameters of the discharge circuit 103 of the nuclear power plant battery discharge test device; Step S503: Connect the discharge circuit 103 of the nuclear power plant battery discharge test device to start supplying power to the equipment to be repaired.

[0047] Step S504: After the maintenance work is completed, the discharge circuit 103 of the control nuclear power plant battery discharge test device is disconnected.

[0048] Step S505: Disconnect the equipment to be inspected from the nuclear power plant battery discharge test device.

[0049] In this embodiment, the nuclear power plant battery discharge test device serves as a maintenance power source to supply power to the equipment under maintenance.

[0050] The following is combined Figure 2 The specific workflow of the nuclear power plant battery discharge test device as an energy storage device and as a maintenance power source is explained.

[0051] (1) When a lead-acid battery is discharging: The first step is to connect the discharge circuit 103 of the DC system lead-acid battery to the distribution panel, and then connect the distribution panel to the No. 1 interface of the nuclear power plant battery discharge test device via a cable.

[0052] Step 2: Set the parameters for DC / DC converter #1. Specifically: the input voltage range should be compatible with lead-acid batteries, the discharge current should be the current required for lead-acid battery discharge, and the output voltage should be compatible with 001BT.

[0053] Third step: Close the discharge switch on the distribution panel.

[0054] Step 4: Close 001JA.

[0055] Step 5: Close 003JA.

[0056] Step 6: The lead-acid battery begins to discharge. The discharge test monitoring device monitors whether the discharge conditions have been met. If the discharge conditions have been met, the discharge ends.

[0057] Step 7: Disconnect 003JA and disconnect 001JA.

[0058] Step 8: Disconnect the discharge switch on the distribution panel.

[0059] Step 9: Disconnect the cable from interface 1 of the nuclear power plant battery discharge test device.

[0060] (2) When the nuclear power plant battery discharge test device is used as a maintenance power source: The first step is to connect the plug of the equipment to be inspected to interface #2 of the nuclear power plant battery discharge test device.

[0061] Step 2: Set the parameters for DC / AC #2. Specifically: adapt the output voltage to the equipment under maintenance, and adapt the input voltage to 001BT.

[0062] Step 3: Close 004JA.

[0063] Step 4: Close 002JA to start supplying power to the equipment to be repaired.

[0064] Step 5: After the maintenance work is completed, disconnect 002JA and disconnect 004JA.

[0065] Step 6: Disconnect the maintenance plug from interface #2.

[0066] The nuclear power plant battery discharge test device designed in this invention stores the energy generated during the battery discharge test and powers the maintenance tools, thereby reducing the risk of fire caused by the large amount of heat released during the battery discharge test. At the same time, it utilizes the discharge energy, which increases both safety and economy.

[0067] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0068] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0069] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0070] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They do not limit the scope of protection of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A nuclear power plant battery discharge test device, characterized in that, include: Interface unit, charging circuit, discharging circuit, and energy storage unit; The interface unit is connected to the discharge circuit of the lead-acid battery through the distribution panel. The charging circuit is connected to the interface unit and the energy storage unit respectively. The discharge circuit is connected to the interface unit and the energy storage unit respectively, and the discharge circuit is also connected to the charging circuit. When the lead-acid battery is subjected to a discharge test, the charging circuit is turned on and the discharge circuit is turned off. The electrical energy released by the lead-acid battery is used to charge the energy storage unit in sequence through the interface unit and the charging circuit. After the lead-acid battery discharge test is completed, the charging circuit is disconnected and the discharge circuit is connected. The energy storage unit outputs electrical energy to the equipment under maintenance through the discharge circuit and the interface unit.

2. The nuclear power plant battery discharge test apparatus according to claim 1, characterized in that, The interface unit includes: a first interface and a second interface; The first interface is connected to the charging circuit and is used to receive the electrical energy released by the lead-acid battery when the lead-acid battery is discharging. The second interface is connected to the discharge circuit and is used to transmit the electrical energy output by the energy storage unit to the equipment under maintenance.

3. The nuclear power plant battery discharge test apparatus according to claim 2, characterized in that, The charging circuit includes: a first switch, a charging conversion module, and a third switch; The input terminal of the first switch is connected to the first interface, the output terminal of the first switch is connected to the input terminal of the charging conversion module, the output terminal of the charging conversion module is connected to the input terminal of the third switch, and the output terminal of the third switch is connected to the energy storage unit.

4. The nuclear power plant battery discharge test apparatus according to claim 3, characterized in that, The charging conversion module is a DC / DC converter used to convert the DC power released by the lead-acid battery into DC power.

5. The nuclear power plant battery discharge test apparatus according to claim 3, characterized in that, The discharge circuit includes: a second switch, a discharge conversion module, and a fourth switch; The output terminal of the second switch is connected to the second interface, the input terminal of the second switch is connected to the output terminal of the discharge conversion module, the input terminal of the discharge conversion module is connected to the output terminal of the fourth switch, and the input terminal of the fourth switch is connected to the energy storage unit.

6. The nuclear power plant battery discharge test apparatus according to claim 5, characterized in that, The discharge conversion module is a DC / AC converter used to convert the DC power output by the energy storage unit into AC power.

7. The nuclear power plant battery discharge test apparatus according to claim 5, characterized in that, The third switch and the fourth switch are equipped with a mechanical interlocking device.

8. The nuclear power plant battery discharge test apparatus according to claim 5, characterized in that, The energy storage unit is a lithium iron phosphate battery energy storage system; The first switch, the second switch, the third switch, and the fourth switch are all circuit breakers.

9. A nuclear power plant battery discharge test system, characterized in that, include: Lead-acid battery, distribution panel, discharge switch installed on the distribution panel, discharge test monitoring device, and nuclear power plant battery discharge test device according to any one of claims 1-8; The lead-acid battery is connected to the distribution panel via a cable, and the discharge switch is connected to the nuclear power plant battery discharge test device via a cable. When the lead-acid battery is subjected to a discharge test, the discharge switch is closed, and the electrical energy released by the lead-acid battery is transmitted to the nuclear power plant battery discharge test device through the discharge switch; the discharge test monitoring device is used to monitor the discharge status of the lead-acid battery in real time.

10. A method for testing the discharge of a nuclear power plant battery, applied to the nuclear power plant battery discharge testing system of claim 9, characterized in that, Includes the following steps: Connect the discharge circuit of the lead-acid battery to the distribution panel; The distribution panel is connected to the nuclear power plant battery discharge test device via a cable. Close the discharge switch on the aforementioned distribution panel; Connect the charging circuit of the nuclear power plant battery discharge test device, and at the same time control the discharge circuit of the nuclear power plant battery discharge test device to remain disconnected; When the discharge test begins, the electrical energy released by the lead-acid battery is discharged to the nuclear power plant battery discharge test device through the discharge switch, and the nuclear power plant battery discharge test device is in a charging state. After the lead-acid battery has finished discharging, the charging circuit of the nuclear power plant battery discharge test device is disconnected. Control the discharge switch to open; Disconnect the cable connecting the nuclear power plant battery discharge test device to the switchboard.

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