Portable intelligent electrical test power supply system with triple safety protection system

Abstract

The utility model discloses a portable intelligent electrical test power supply system with a triple safety protection system, which comprises a battery pack level fire extinguishing device, a lithium battery pack, a lithium battery protection board, a DC-DC booster circuit, an inverter and a cloud diagnosis and monitoring platform, and is characterized in that the lithium battery protection board is internally provided with a bidirectional MOS (Metal Oxide Semiconductor) tube; the battery pack level fire extinguishing device is connected with the lithium battery pack; the lithium battery pack is connected with the DC-DC booster circuit and the inverter through the bidirectional MOS tube, and the lithium battery protection board is connected with the lithium battery pack and wirelessly connected with the cloud diagnosis and monitoring platform. The device can perform intervention at the first time at the initial stage of thermal runaway of the lithium battery to prevent thermal runaway fire.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply safety protection, in particular to a portable intelligent electrical test power supply system with a triple safety protection system. Background Art

[0002] Commissioning tests of distribution transformers or emergency repairs for power outages caused by line faults require portable power-frequency test power supplies to complete the preventive and specialized tests required before electrical equipment is powered on. Portable intelligent electrical test power supplies based on lithium battery energy storage offer a range of advantages, including high-quality output waveforms, compact size, light weight, long cycle life, and zero-emission, clean, and environmentally friendly operation. These portable power supplies are gaining popularity and hold great promise for future development.

[0003] However, frequent fire safety issues with lithium batteries, the core energy storage device for power supply devices, have become a major technical bottleneck restricting their development. Although lithium iron phosphate batteries, which have relatively high thermal stability, are commonly used in portable power supply devices, recent fire and explosion accidents in lithium iron phosphate battery energy storage power stations have sounded a wake-up call. The safety of the material system does not guarantee the safety of the integrated battery cell. As an energy carrier, lithium iron phosphate batteries still pose significant safety issues due to thermal runaway.

[0004] Lithium battery cells, with their low voltage and small capacity, are typically not suitable for standalone use. They must be connected in series or parallel to form battery packs to increase voltage and capacity. The electrical, thermal, and aging dynamics of lithium iron phosphate batteries exhibit significant nonlinear coupling. The grouping and scaling of batteries further complicates the system's behavior and increases the probability of system failure. To ensure the safe and stable operation of lithium battery packs, a lithium battery protection board (PB) is typically required to monitor and protect their operating status. However, existing PBs are mostly based on a system-on-chip (SoC) system with pre-set fixed protection thresholds. Limited by the processing power of microprocessors, these boards struggle to implement more complex protection algorithms and lack bidirectional protection linkage with other systems. This makes them inadequate for fully preventing thermal runaway accidents in lithium batteries. In extreme cases, thermal runaway can still lead to fire safety incidents. For example, a portable power supply device can be subjected to severe mechanical impact, puncture, or crushing during transportation; or a quality defect in the lithium battery itself can damage the polymer separator between the positive and negative electrode materials during use, causing a local short circuit.

[0005] Once the above extreme conditions occur, although the lithium battery protection board will immediately disconnect the charge and discharge circuit, it cannot cut off the short circuit inside the lithium battery. The high temperature caused by the short circuit will further decompose or melt the diaphragm, increase the short circuit area, and the battery's energy will be rapidly released, causing the internal temperature to rise sharply. When the temperature reaches above 100°C, the electrolyte will vaporize and react with the positive electrode material to produce a large amount of flammable gas, causing the internal pressure of the battery to rise sharply. When the internal reaction and pressure continue to a certain stage, the battery pressure relief valve will open (or the shell will rupture), and the flammable gas will be released. The moment it encounters air, it may burn and cause a fire. Therefore, to effectively prevent the occurrence of thermal runaway accidents of lithium batteries, a set of devices or systems that can intervene in the early stage of thermal runaway of lithium batteries, such as cooling and fire extinguishing, is also needed. Utility Model Content

[0006] The present utility model aims to at least partially address the technical problems of the related art. To this end, the present utility model provides a portable intelligent electrical test power supply system with a triple safety protection system. This system can intervene immediately at the early stages of lithium battery thermal runaway, ensuring the safe use of the portable intelligent electrical test power supply in various situations and preventing dangerous situations such as thermal runaway fires and even explosions.

[0007] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions:

[0008] A portable intelligent electrical test power supply system with a triple safety protection system, comprising:

[0009] A battery pack-level fire extinguishing device, a lithium battery pack, a lithium battery protection board, a DC-DC boost circuit and inverter, and a cloud diagnosis and monitoring platform. A bidirectional MOS tube is arranged inside the lithium battery protection board; the battery pack-level fire extinguishing device is connected to the lithium battery pack; the lithium battery pack is connected to the DC-DC boost circuit and inverter through the bidirectional MOS tube, and the lithium battery protection board is connected to the lithium battery pack and is wirelessly connected to the cloud diagnosis and monitoring platform; wherein, the battery pack-level fire extinguishing device is used for the first level of protection of the lithium battery pack from thermal runaway; the lithium battery protection board is used to realize the second level of protection of the lithium battery pack from overcharging, over-discharging, overcurrent and overtemperature; the cloud diagnosis and monitoring platform is used to realize the third level of protection of remote diagnosis and alarm of the lithium battery pack.

[0010] Preferably, the battery pack-level fire extinguishing device, lithium battery group, lithium battery protection board, DC-DC boost circuit and inverter are all arranged in a box, and the interior of the box includes a battery compartment, a control panel compartment and a distribution device compartment divided by a metal frame, and the material of the metal frame is aviation aluminum.

[0011] Preferably, the lithium battery pack is arranged in the battery compartment; and the battery pack-level fire extinguishing device is glued to a relatively closed space compartment around the lithium battery pack.

[0012] Preferably, the top cover of the battery compartment is an insulation board; the battery pack-level fire extinguishing device includes a fire extinguishing sticker, a fire extinguishing rope and a rectangular fire extinguishing assembly, the interior of the fire extinguishing sticker, the fire extinguishing rope and the rectangular fire extinguishing assembly are microcapsules made of an oxidant, an adhesive and a perfluoroacetone fire extinguishing agent, wherein the rectangular fire extinguishing assembly is glued to the lower surface of the insulation board.

[0013] Preferably, the fire extinguishing patch is adhered to the welding copper plate that connects the electrodes of the single cells in series in the lithium battery pack.

[0014] Preferably, the fire extinguishing rope is arranged on the surface of the lithium battery pack in an S-shaped manner.

[0015] Preferably, the lithium battery protection board, DC-DC boost circuit and inverter are arranged in the control board compartment, wherein the lithium battery protection board is arranged on the upper surface of the heat insulation board.

[0016] Preferably, the power distribution device compartment is provided with a panel, and the panel is provided with an air switch and a socket.

[0017] Preferably, both side walls of the box are provided with air ducts for heat dissipation.

[0018] Preferably, the lithium battery protection board is provided with a voltage sensor, a current sensor, a temperature sensor for monitoring electrical parameters and temperature parameters, and an equalization circuit for equalizing the lithium battery pack.

[0019] The utility model has at least the following technical effects:

[0020] (1) The utility model realizes real-time online monitoring of the operating status of each single cell of the lithium battery pack, such as voltage, current, temperature, state of charge, capacity, and health status, and uploads the sampled data to the cloud diagnosis and monitoring platform through wireless communication technology, realizing remote data backup, which is conducive to finding the cause of safety accidents and determining responsibilities.

[0021] (2) The utility model uses a cloud diagnosis and monitoring platform to perform big data analysis on the collected historical operating data, which can discover some safety hazards missed by the lithium battery protection board and notify the user to repair and maintain it in time, thereby improving the safety and reliability of the lithium battery pack operation.

[0022] (3) The present invention adopts a self-triggering battery pack thermal runaway suppression device with repeated fire extinguishing capability, namely a battery pack-level fire extinguishing device, which can intervene in the thermal runaway state of the lithium battery pack in the first time, effectively extinguish the open flame of the lithium battery pack and effectively cool it down, preventing the accident from further expanding.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the circuit structure of a portable intelligent electrical test power supply system with a triple safety protection system according to an embodiment of the present utility model.

[0025] Figure 2 This is a schematic diagram of the box structure of an embodiment of the present utility model.

[0026] Figure 3 This is a schematic diagram of the installation position of the fire extinguishing sticker according to an embodiment of the present utility model.

[0027] Figure 4-Figure 7 Schematic diagram of each user interface of an embodiment of the present utility model. DETAILED DESCRIPTION

[0028] The present embodiment is described in detail below. Examples of the embodiment are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] The portable intelligent electrical test power supply system with a triple safety protection system of this embodiment will be described below with reference to the accompanying drawings.

[0030] Figure 1 This is a circuit diagram of a portable intelligent electrical test power supply system with a triple safety protection system according to an embodiment of the present invention. Figure 1 As shown, the portable intelligent electrical test power supply system with a triple safety protection system includes a battery pack-level fire extinguishing device 14, a lithium battery pack 1, a lithium battery protection board 5, a DC-DC boost circuit and inverter 6 and a cloud diagnosis and monitoring platform 12. A bidirectional MOS (metal-oxide semiconductor field-effect transistor) tube is provided inside the lithium battery protection board 5; the battery pack-level fire extinguishing device 14 is connected to the lithium battery pack 1; the lithium battery pack 1 is connected to the DC-DC boost circuit and inverter 6 through the bidirectional MOS tube, the lithium battery protection board 5 is connected to the lithium battery pack 1, and is wirelessly connected to the cloud diagnosis and monitoring platform 12.

[0031] In this embodiment, the safety protection system of the portable intelligent electrical test power supply system with a triple safety protection system consists of three core modules: a lithium battery protection board 5, a battery pack-level fire extinguishing device 14, and a cloud diagnosis and monitoring platform 12. The lithium battery protection board 5 is connected to the cloud diagnosis and monitoring platform 12 via a 4G (fourth-generation mobile communication network) wireless communication module 13. The battery pack-level fire extinguishing device 14 provides the first level of protection against thermal runaway of the lithium battery pack 1; the lithium battery protection board 5 provides the second level of protection against overcharge, over-discharge, overcurrent, and overtemperature of the lithium battery pack 1; and the cloud diagnosis and monitoring platform 12 provides the third level of protection against remote diagnosis and alarms of the lithium battery pack 1.

[0032] In one embodiment of the present invention, the battery pack-level fire extinguishing device 14, the lithium battery group 1, the lithium battery protection board 5, the DC-DC boost circuit and the inverter 6 are all arranged in a box, and the interior of the box includes a battery compartment, a control board compartment and a distribution device compartment divided by a metal frame, wherein the metal frame is made of aviation aluminum.

[0033] like Figure 2 As shown, the enclosure 10 is constructed from a military-grade plastic chassis with an upper panel cover 9, which can be completely sealed when not in use to effectively protect against dust and water. The interior of the enclosure is divided into three independent compartments by a metal frame: the bottom compartment houses the battery; the middle compartment houses the control board, which houses the lithium battery protection board 5, the DC-DC boost circuit, and the inverter 6; and the top compartment houses the power distribution device, which features a panel housing power distribution components such as air switches and outlets. Narrow passages are provided on the left and right walls of the enclosure, allowing fans to create a continuous airflow duct, effectively dissipating heat.

[0034] In this embodiment, the metal frame is made of aviation aluminum because, on the one hand, it is relatively light and not easily corroded; on the other hand, it has good thermal conductivity and can better transfer the heat of the lithium battery pack 1, the lithium battery protection board 5, the DC-DC boost circuit and the inverter 6 to the external air.

[0035] In this embodiment, the lithium battery pack 1 is set in the battery compartment; the battery pack-level fire extinguishing device 14 is glued to the relatively closed space around the lithium battery pack 1. The top cover of the battery compartment is a heat insulation board; the battery pack-level fire extinguishing device 14 includes a fire extinguishing sticker 2, a fire extinguishing rope 3 and a rectangular fire extinguishing component 4. The interior of the fire extinguishing sticker 2, the fire extinguishing rope 3 and the rectangular fire extinguishing component 4 is a microcapsule made of an oxidant, an adhesive and a perfluoroacetone fire extinguishing agent, wherein the rectangular fire extinguishing component 4 is glued to the lower surface of the heat insulation board. The fire extinguishing sticker 2 is as shown in FIG. Figure 3 As shown, it is attached to the welding copper plate that connects the electrodes of the single cells in series in the lithium battery pack 1. The fire extinguishing rope 3 is arranged on the surface of the lithium battery pack 1 in an S-shaped manner.

[0036] Specifically, the battery pack-level fire extinguishing device 14, in various forms such as fire extinguishing stickers 2, fire ropes 3, and rectangular fire extinguishing components 4, is flexibly affixed to the relatively enclosed space surrounding the lithium battery pack 1. The core of the fire extinguishing stickers 2, fire ropes 3, and rectangular fire extinguishing components 4 is a microcapsule made of an oxidant, an adhesive, and perfluoroacetone fire extinguishing agent. When the lithium battery pack 1 experiences thermal runaway, causing the ambient temperature to exceed 120°C, the oxidant on the surface of the microcapsules undergoes a redox reaction, causing the microcapsules to rupture and release the perfluoroacetone fire extinguishing agent sealed inside. The perfluoroacetone fire extinguishing agent rapidly extinguishes the fire through three effects: physical cooling, oxygen isolation, and chemical inhibition. Once the fire is successfully extinguished, the ambient temperature returns to normal, the redox reaction ceases, and the unruptured microcapsules continue to provide protection for the battery pack comprising the lithium battery pack 1. The advantages of this solution are that perfluoroacetone fire extinguishing agent is non-toxic, non-corrosive, and does not damage the atmospheric ozone layer. The fire extinguishing device is small in size, stored at normal pressure, does not require the laying of pipelines, and does not require control circuits. It can be self-inductively started, extinguishes fires quickly, and has no blind spots. In particular, it has a secondary fire extinguishing capability, which can effectively prevent the re-ignition of the lithium battery pack 1 after thermal runaway, greatly improving the fire extinguishing effect of the fire extinguishing device.

[0037] The fire extinguishing patch 2 is attached to the copper plate that connects the electrodes of the individual battery cells. These positive and negative electrodes penetrate the battery pack through the metal, where the temperature is highest, and can immediately indicate thermal runaway problems within the battery pack.

[0038] In this embodiment, the battery pack-level fire extinguishing device 14 has multiple flexible configuration options. It can also be covered on the lithium battery pack 1 in the form of an S-shaped fire extinguishing rope 3, or adhered to the heat insulation board on the top of the lithium battery pack 1 in the form of a rectangular fire extinguishing component 4. The S-shaped fire extinguishing rope 3 is mainly to provide all-round safety protection for the battery pack without blind spots, while the rectangular fire extinguishing component 4 adhered to the top is to ensure that the total mass of the perfluoroacetone fire extinguishing agent is sufficient. Experimental data shows that when the ratio between the total mass of the perfluoroacetone fire extinguishing agent and the volume of the battery compartment space meets 0.001g / L, the battery pack-level fire extinguishing device 14 can effectively and quickly extinguish fires.

[0039] To fully utilize the secondary fire extinguishing capabilities of the battery pack-level fire extinguishing device 14 and enhance the cooling and fire extinguishing effect, the battery pack-level fire extinguishing devices 14 arranged in different locations can also be set with different activation temperatures. Specifically, the fire extinguishing sticker 2 is generally set to activate at 120°C, while the activation temperature of the fire extinguishing rope 3 is slightly increased to 140°C. The rectangular fire extinguishing assembly 4 is set to activate only when the temperature exceeds 180°C. This gradual activation can greatly prevent the lithium battery pack 1 from reigniting after the initial fire extinguishing.

[0040] In this embodiment, the battery pack-level fire extinguishing device 14 realizes emergency intervention and protection in the early stage of a fire accident. It uses a variety of different forms of fire extinguishing modules to be installed and covered in different corners of the lithium battery pack 1. When encountering flames, electric arcs or abnormally high temperatures exceeding 120°C, it can automatically sense and quickly spray perfluorohexanone fire extinguishing agent to extinguish the open flame and reduce the temperature. It also has the ability to repeatedly extinguish fires, thereby further improving the fire extinguishing effect.

[0041] In one embodiment of the present invention, the lithium battery protection board 5 is arranged on the upper surface of the heat insulation board of the control board compartment close to the battery compartment, and is used to collect the voltage, temperature and current signals of each single cell in the lithium battery pack 1, compare the detection results with the allowable threshold value, and control the on and off of the bidirectional MOS tube inside the lithium battery protection board 5 to achieve overcharge, over-discharge, overcurrent and overtemperature protection during the charging and discharging process of the lithium battery pack 1; at the same time, the collected key data is uploaded to the cloud diagnosis and monitoring platform 12 through the wireless communication module 13, and the instructions issued by the cloud diagnosis and monitoring platform 12 are received, and the cloud diagnosis and monitoring platform 12 is coordinated with the work to achieve more comprehensive protection for the lithium battery pack 1.

[0042] In the triple safety protection system constructed in this embodiment, the lithium battery protection board 5 implements hardware protection with a response speed of milliseconds. However, due to the computing power and storage space limitations of the embedded microprocessor, it can only use simple algorithms such as threshold comparison to provide power-off protection for abnormal charging and discharging conditions of the lithium battery pack 1 based on real-time monitored single cell signals (voltage, current, and temperature).

[0043] In this embodiment, the lithium battery protection board 5 includes a voltage sensor, a temperature sensor, a current sensor, and a balancing circuit, etc., which are matched therewith to realize corresponding electrical parameter detection and battery balancing functions.

[0044] The protection functions implemented by the lithium battery protection board 5 include, but are not limited to: undervoltage protection (any single cell voltage is lower than 2.5V or the total voltage of the battery module is lower than 40V), overcharge protection (any single cell voltage is higher than 3.65V or the total voltage of the battery module is higher than 58.4V), overcurrent protection (charging current is greater than 10A or discharging current is greater than 55A), overtemperature protection (any single cell temperature exceeds 60°C), low temperature charging prohibition protection (the temperature is lower than 0°C during charging), equalization destruction protection (single cell voltage difference exceeds 0.8V), and thermal runaway protection (temperature difference between single cells exceeds 20°C). Once the above protection occurs, the MOS tube on the lithium battery protection board 5 will be turned off immediately, cutting off the connection between the lithium battery pack 1 and the DC-DC boost circuit and inverter 6.

[0045] In one embodiment of the present invention, a cloud diagnosis and monitoring platform 12 is arranged on an Internet cloud server. It is responsible for receiving and storing the collected data uploaded by the lithium battery protection board 5, and diagnosing the health status of the lithium battery pack 1 in combination with the historical collected data. Based on the diagnosis results, protection instructions are issued to the lithium battery protection board 5, and when necessary, an alarm signal can be sent to the user to promptly maintain the lithium battery pack 1 and eliminate its safety hazards.

[0046] In this embodiment, the cloud diagnosis and monitoring platform 12 implements software protection, using big data mining algorithms to discover safety hazards in the lithium battery pack 1. The protection functions it implements include but are not limited to: 1) short circuit detection within the battery cell, which is achieved based on the abnormal drop in the voltage of the single battery cell during constant current charging of the lithium battery pack 1; 2) battery pack loss of balance detection, which is achieved by identifying the resistance and capacity of each single battery cell based on the second-order charge and discharge model of the lithium battery pack 1; 3) battery cell aging detection, which is determined based on the historical change trend of the time required to fully charge the battery cell and the discharge capacity.

[0047] The lithium battery protection board 5 typically includes a built-in balancing circuit based on voltage feedback control, but its balancing capability is relatively weak. When cell mismatches are significant, achieving effective balancing is difficult. In such cases, the abnormal cells generally need to be replaced through maintenance. The cloud diagnostic and monitoring platform 12's internal battery pack imbalance detection is an effective means of achieving this. Based on all collected sampled data and the strong nonlinear modeling capabilities of big data algorithms, it identifies the resistance and capacity of each individual cell using the second-order charge and discharge model of the lithium battery pack 1, thereby selecting low-quality cells that are severely unbalanced and require replacement.

[0048] It should be noted that after receiving the battery operation data uploaded by the lithium battery protection board 5, the cloud diagnosis and monitoring platform 12 will call the big data mining algorithm to process it and convert the raw data into data that can be used for reporting and visual analysis. Figure 4-Figure 7 The user interface shown is displayed, and a unified and standardized battery runtime database is formed and stored in the cloud server.

[0049] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0050] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. After reading the above description, various modifications and alternatives to the present invention will be readily apparent to those skilled in the art. Therefore, the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A portable intelligent electrical test power supply system with a triple safety protection system, characterized in that: include: A battery pack-level fire extinguishing device, a lithium battery pack, a lithium battery protection board, a DC-DC boost circuit and inverter, and a cloud diagnosis and monitoring platform. A bidirectional MOS tube is arranged inside the lithium battery protection board; the battery pack-level fire extinguishing device is connected to the lithium battery pack; the lithium battery pack is connected to the DC-DC boost circuit and inverter through the bidirectional MOS tube, and the lithium battery protection board is connected to the lithium battery pack and is wirelessly connected to the cloud diagnosis and monitoring platform; wherein, the battery pack-level fire extinguishing device is used for the first level of protection of the lithium battery pack from thermal runaway; the lithium battery protection board is used to realize the second level of protection of the lithium battery pack from overcharging, over-discharging, overcurrent and overtemperature; the cloud diagnosis and monitoring platform is used to realize the third level of protection of remote diagnosis and alarm of the lithium battery pack.

2. The portable intelligent electrical test power supply system with a triple safety protection system as claimed in claim 1, characterized in that: The battery pack-level fire extinguishing device, lithium battery pack, lithium battery protection board, DC-DC boost circuit and inverter are all arranged in a box. The interior of the box includes a battery compartment, a control panel compartment and a distribution device compartment divided by a metal frame, and the material of the metal frame is aviation aluminum.

3. The portable intelligent electrical test power supply system with triple safety protection system as claimed in claim 2, characterized in that: The lithium battery pack is arranged in the battery compartment; the battery pack-level fire extinguishing device is glued to the relatively closed space compartment around the lithium battery pack.

4. The portable intelligent electrical test power supply system with a triple safety protection system as claimed in claim 3, characterized in that: The top cover of the battery compartment is an insulation board; the battery pack-level fire extinguishing device includes a fire extinguishing sticker, a fire extinguishing rope and a rectangular fire extinguishing assembly. The interior of the fire extinguishing sticker, the fire extinguishing rope and the rectangular fire extinguishing assembly are microcapsules made of an oxidant, an adhesive and a perfluoroacetone fire extinguishing agent, wherein the rectangular fire extinguishing assembly is glued to the lower surface of the insulation board.

5. The portable intelligent electrical test power supply system with triple safety protection system as claimed in claim 4, characterized in that: The fire extinguishing patch is adhered to the welding copper plate that connects the electrodes of the single cells in series in the lithium battery pack.

6. The portable intelligent electrical test power supply system with triple safety protection system as claimed in claim 4, characterized in that: The fire extinguishing rope is arranged on the surface of the lithium battery pack in an S-shaped manner.

7. The portable intelligent electrical test power supply system with triple safety protection system as claimed in claim 4, characterized in that: The lithium battery protection board, DC-DC boost circuit and inverter are arranged in the control board compartment, wherein the lithium battery protection board is arranged on the upper surface of the heat insulation board.

8. The portable intelligent electrical test power supply system with triple safety protection system as claimed in claim 2, characterized in that: The power distribution device compartment is provided with a panel, and the panel is provided with an air switch and a socket.

9. The portable intelligent electrical test power supply system with triple safety protection system as claimed in claim 2, characterized in that: Both side walls of the box are provided with air ducts for heat dissipation.

10. A portable intelligent electrical test power supply system with a triple safety protection system according to any one of claims 1 to 9, characterized in that: The lithium battery protection board is provided with a voltage sensor, a current sensor, a temperature sensor for monitoring electrical parameters and temperature parameters, and an equalization circuit for equalizing the lithium battery pack.

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