Data acquisition device for energy storage system

Abstract

The invention relates to the technical field of data acquisition, and discloses a data acquisition device for an energy storage system, and the device comprises a data acquisition module which is used for collecting system data information of the energy storage system; the data sending module is used for forwarding system data information; the main power supply module is used for converting an external input voltage into a power supply voltage source and supplying power to the data acquisition module and the data sending module through the power supply voltage source; the standby power supply module is used for storing electric energy based on the power supply voltage source and converting the stored electric energy into a standby voltage source; and the power supply switching module is used for switching the standby voltage source to supply power to the data acquisition module and the data sending module when the power supply voltage source loses power, and the continuity and reliability of data acquisition and forwarding are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of data acquisition, and in particular to a data acquisition device for an energy storage system. Background Art

[0002] A data acquisition device is a device or system used to collect, convert, and record data related to energy storage systems. Its primary functions include data acquisition, conversion, and recording. It converts raw data from various sensors, devices, or environments into usable digital information for further analysis, processing, or storage.

[0003] Currently, data acquisition devices acquire data from each energy storage system through a universal data interface and forward it to the higher-level system. Shared energy storage systems are typically located outdoors, and external power supply issues are prone to occur. In actual transmission, when external power supply issues occur, such as sudden power outages, data acquisition device communication data may fluctuate, causing data transmission flicker and even interrupting data acquisition communications.

[0004] Therefore, the data acquisition device of the existing energy storage system has the problem of unstable operation. Summary of the Invention

[0005] In view of this, the present invention provides a data acquisition device for an energy storage system to solve or partially solve the technical problem of unstable operation of the data acquisition device for the energy storage system in the prior art.

[0006] The technical solutions proposed by the present invention are as follows:

[0007] The present invention provides a data acquisition device for an energy storage system, comprising: a data acquisition module for acquiring system data information of the energy storage system; a data sending module for forwarding the system data information; a main power supply module for converting an external input voltage into a power supply voltage source, and supplying power to the data acquisition module and the data sending module through the power supply voltage source; a backup power supply module for storing electric energy based on the power supply voltage source, and converting the stored electric energy into a backup voltage source; and a power supply switching module for switching the backup voltage source to supply power to the data acquisition module and the data sending module when the power supply voltage source loses power.

[0008] The data acquisition device for an energy storage system of the present invention realizes effective acquisition and transmission of energy storage system data through a data acquisition module and a data sending module. The provision of a main power module and a backup power module ensures stable operation of the device under normal external power supply and power failure conditions. The power supply switching module realizes switching between the main power module and the backup power module. When the power supply voltage source fails, the backup voltage source is switched to power the data acquisition module and the data sending module. Collection and communication will not be interrupted due to external power supply problems, thereby ensuring the continuity and reliability of data acquisition and forwarding, which is of great significance to the stable operation and data monitoring of the energy storage system.

[0009] Optionally, the backup power supply module includes a step-down circuit, an energy storage capacitor and a boost circuit, the step-down circuit is used to convert the power supply voltage source into a first preset voltage and charge the energy storage capacitor based on the first preset voltage, and the boost circuit is used to convert the positive electrode voltage of the energy storage capacitor into a backup voltage source.

[0010] In this method, through the combined design of a step-down circuit, an energy storage capacitor and a boost circuit, the backup power module is charged by charging the energy storage capacitor through a power supply voltage source, so that the backup power module can efficiently store and convert electrical energy. The backup power module does not require additional external input power, reducing the cost of use and having a wide range of applicable scenarios.

[0011] Optionally, the step-down circuit includes a step-down chip, and the boost circuit includes a boost chip. The input end of the step-down chip is connected to the power supply voltage source, the output end of the step-down chip is connected to the positive electrode of the energy storage capacitor, the positive electrode of the energy storage capacitor is connected to the input end of the boost chip and the enable end of the boost chip. The step-down chip is used to convert the power supply voltage source into a first preset voltage and charge the energy storage capacitor based on the first preset voltage. The boost chip is used to convert the positive electrode voltage of the energy storage capacitor into a backup voltage source, wherein the starting voltage of the boost chip is less than the first preset voltage.

[0012] In this method, the voltage conversion process is precisely controlled through the professional functions of the buck chip and the boost chip, and the starting voltage of the boost chip is lower than the first preset voltage, ensuring that the boost circuit can start working when the energy storage capacitor has a certain amount of electricity, effectively improving the availability and response speed of the backup power module, and enhancing the power supply guarantee capability of the data acquisition device in emergency situations.

[0013] Optionally, the buck circuit further includes a first diode, the anode of the first diode is connected to the power supply voltage source, and the cathode of the first diode is respectively connected to the input terminal of the buck chip and the enable terminal of the buck chip.

[0014] In this manner, a first diode is added to the step-down circuit, and the unidirectional conductivity of the diode is utilized to prevent current backflow, thereby protecting the main power module and improving the stability and reliability of the step-down circuit.

[0015] Optionally, the power supply switching module includes a first PMOS tube, a second diode and a first resistor, the source of the first PMOS tube is connected to the backup voltage source, the gate of the first PMOS tube is respectively connected to the power supply voltage source, the positive electrode of the second diode and the first end of the first resistor, the second end of the first resistor is grounded, and the drain of the first PMOS tube is respectively connected to the negative electrode of the second diode and the back-end circuit, and the data acquisition module and the data sending module are powered by the back-end circuit.

[0016] In this manner, automatic switching of the main and standby power supplies is achieved through the coordinated work of the first PMOS tube, the second diode, and the first resistor. When the power supply voltage source is normal, the first PMOS tube is turned on to supply power to the data acquisition module and the data sending module; when the power supply voltage source loses power, the first PMOS tube is turned off, and the standby voltage source supplies power to the data acquisition module and the data sending module through the second diode and the back-end circuit, thereby ensuring the continuity and reliability of the power supply. The circuit structure is relatively simple and easy to implement.

[0017] Optionally, the data acquisition device for the energy storage system further includes an encryption module, which includes an encryption chip, and the system data information is encrypted by the encryption chip.

[0018] In this method, an encryption module is added and an encryption chip is used to encrypt system data information, effectively preventing the risk of data leakage during collection, transmission and storage, and ensuring the data security and privacy of the energy storage system.

[0019] Optionally, the data acquisition device for the energy storage system further includes a data processing module, which is used to pre-process the collected system data information.

[0020] In this method, the received data is pre-processed by the data processing module, such as illegality judgment, over-limit judgment and alarm judgment, so as to further improve the security of data collected by the data collection device for the energy storage system.

[0021] Optionally, the data acquisition device for the energy storage system also includes a main power monitoring circuit, the input end of the main power monitoring circuit is connected to the power supply voltage source, and the output end of the main power monitoring circuit is connected to the data processing module. The main power monitoring circuit is used to collect the main power power-off signal to the data processing module, and the data processing module is also used to put the data acquisition device to sleep according to the main power power-off signal.

[0022] In this mode, when the main power module loses power, the data acquisition device enters a sleep mode, extending the use time of the backup power supply. When the main power module resumes power supply, the data acquisition device automatically returns to the state before the power outage to ensure the integrity of the collected data.

[0023] Optionally, the data acquisition device for the energy storage system further includes a storage module, and the storage module is used to record system data information.

[0024] In this method, the addition of the storage module provides a reliable storage space for system data information, facilitating subsequent retrospective analysis, fault diagnosis, and data statistics of the energy storage system's operating status.

[0025] Optionally, the data acquisition device for the energy storage system further includes a data statistics module, which is used to count the power information in the system data information.

[0026] In this method, the data statistics module can count the electricity information and power information of shared energy storage, providing users with intuitive electricity data, facilitating users to rationally arrange the use and scheduling of the energy storage system, and improve the utilization efficiency of the energy storage system. It also provides an important basis for the operation and management of the energy storage system, enhancing the practicality and user-friendliness of the device.

[0027] Optionally, the data acquisition device for the energy storage system further includes a user interaction module, which is used to provide a web service, and a user queries system data information of the energy storage system based on the web service.

[0028] In this way, users can easily and quickly query the system data information of the energy storage system through the network without being restricted by location and time, which greatly improves the user's monitoring and management efficiency of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly express the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a principle block diagram of a data acquisition device for an energy storage system according to an embodiment of the present invention;

[0031] Figure 2 1 is a circuit diagram of a backup power supply module according to an embodiment of the present invention;

[0032] Figure 3 This is a circuit diagram of a power supply switching module in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two components; it can mean a wireless connection or a wired connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] The data acquisition device for energy storage systems is a device or system used to collect, convert and record data related to the energy storage system. It generally has the following functions:

[0038] Data acquisition: Collect parameters such as voltage, current, and temperature of the battery management system, as well as relevant parameters of the PCS system such as voltage, current, and power on the DC side.

[0039] Data processing: Perform rationality checks and limit value alarms on the collected data, and perform statistical analysis and display.

[0040] Data storage: Store data in a supporting database and support hierarchical storage.

[0041] Visual monitoring: Provides visual monitoring of the energy storage system, including real-time monitoring of battery pack performance and historical data analysis.

[0042] Alarm management: Perform alarm management on abnormal situations to ensure the safe operation of the energy storage system.

[0043] In the existing technology, the data acquisition device obtains data from each energy storage system through a universal data interface and forwards it to the upper-level system. During actual transmission, due to power supply failure, the collected data and communication data of the data acquisition device will also fluctuate, causing data transmission flicker. In addition, the communication data uses conventional soft encryption and is easily cracked, affecting the transmission of shared energy storage data, thereby affecting the maximization of shared energy storage benefits.

[0044] In order to solve one of the above problems, an embodiment of the present invention provides a data acquisition device for an energy storage system.

[0045] like Figure 1 As shown, the data acquisition device for an energy storage system according to an embodiment of the present invention includes:

[0046] The data acquisition module is used to collect system data information of the energy storage system.

[0047] Specifically, the data acquisition module supports network port, 485 serial port, CAN bus interface and dry contact input interface, and collects system data information of the energy storage system through the above interfaces.

[0048] The data sending module is used to forward system data information.

[0049] The data transmission module supports network port, 485 serial port, CAN bus interface and dry contact input interface (DI). Through the above interfaces, the system data information of the energy storage system is forwarded to the advanced application system. The advanced application system analyzes the energy storage system based on the system data information of the energy storage system.

[0050] The main power supply module is used to convert the external input voltage into a power supply voltage source, and supply power to the data acquisition module and the data sending module through the power supply voltage source.

[0051] Specifically, the main power supply module adopts a 24V power supply, and further steps down the 24V power supply to convert it into a power supply voltage source. The voltage value of the power supply voltage source is between 4.5V and 5.5V. In one example, the voltage value of the power supply voltage source is 5V.

[0052] The backup power supply module is used to store electric energy based on a supply voltage source and convert the stored electric energy into a backup voltage source.

[0053] The power supply switching module is used to switch to a backup voltage source to supply power to the data acquisition module and the data sending module when the power supply voltage source fails.

[0054] Specifically, the backup power supply module includes a rechargeable battery or capacitor. When the power supply voltage source is working normally, it is pre-charged through the power supply voltage source to maintain the power. When the external power supply is lost, the backup energy storage module will continue to power the data acquisition device, and the data acquisition device will perform normal device sleep operation to ensure the integrity of the collected data.

[0055] The data acquisition device for an energy storage system according to an embodiment of the present invention realizes effective acquisition and transmission of energy storage system data through a data acquisition module and a data transmission module. The provision of a main power module and a backup power module ensures stable operation of the device under normal external power supply and power failure conditions. The power supply switching module realizes switching between the main power module and the backup power module. When the power supply voltage source fails, the backup voltage source is switched to power the data acquisition module and the data transmission module. This prevents acquisition and communication interruptions due to external power supply problems, thereby ensuring the continuity and reliability of data acquisition and forwarding, which is of great significance to the stable operation and data monitoring of the energy storage system.

[0056] In some embodiments, as Figure 2 As shown, the backup power supply module includes a step-down circuit, an energy storage capacitor C42 and a boost circuit. The step-down circuit is used to convert the power supply voltage source into a first preset voltage and charge the energy storage capacitor C42 based on the first preset voltage. The boost circuit is used to convert the positive electrode voltage of the energy storage capacitor C42 into a backup voltage source.

[0057] Specifically, the energy storage capacitor C42 is a supercapacitor, which has the advantages of fast charging and discharging, long cycle period, high power, and high safety.

[0058] The voltage value of the power supply voltage source is 5V, the first preset voltage is 2.4V, and the voltage value of the standby voltage source is 4.8V.

[0059] By using a step-down circuit to convert the 5V power supply voltage source into a first preset voltage of 2.4V to charge the energy storage capacitor C42, the maximum voltage value of the positive electrode voltage of the energy storage capacitor C42 can be maintained at around 2.4V. The maximum voltage value of the energy storage capacitor C42 is low and will not have an adverse effect on the power supply voltage source.

[0060] The positive electrode voltage of the energy storage capacitor C42 is converted into a backup voltage source in advance by the boost circuit. When the power supply voltage source fails, the backup voltage source directly supplies power to the data acquisition device.

[0061] In this embodiment, through the combined design of the step-down circuit, the energy storage capacitor C42 and the boost circuit, the backup power supply module is charged by charging the energy storage capacitor C42 through the power supply voltage source, so that the backup power supply module can efficiently store and convert electrical energy. The backup power supply module does not require an additional external input power supply, thereby reducing the cost of use and having a wide range of applicable scenarios.

[0062] Furthermore, the step-down circuit includes a step-down chip U8, and the boost circuit includes a boost chip U10. The input end of the step-down chip U8 is connected to the power supply voltage source, the output end of the step-down chip U8 is connected to the positive electrode of the energy storage capacitor C42, the positive electrode of the energy storage capacitor is connected to the input end of the boost chip U10 and the enable end of the boost chip U10, the step-down chip U8 is used to convert the power supply voltage source into a first preset voltage and charge the energy storage capacitor C42 based on the first preset voltage, and the boost chip U10 is used to convert the positive electrode voltage of the energy storage capacitor C42 into a backup voltage source, wherein the starting voltage of the boost chip U10 is less than the first preset voltage.

[0063] Exemplarily, the buck circuit is a BUCK buck circuit, the buck chip U8 has a model number of SM8082AAAC, and the BUCK buck circuit is mainly formed by the buck chip U8 and its peripheral circuits.

[0064] The boost circuit is a BOOST boost circuit. The model of the boost chip U10 is SY7072A. The BOOST boost circuit is mainly composed of the boost chip U10 and its peripheral circuits. The starting voltage of the BOOST boost circuit is 0.85V.

[0065] In the initial state, the voltage of the energy storage capacitor C42 is 0, and the voltage signal +5V_M of the power supply voltage source is reduced to 2.4V by the step-down circuit, and is charged to the energy storage capacitor C42 through the resistors R18 and R19.

[0066] The energy storage capacitor C42 is simultaneously connected to a boost circuit composed of a boost chip U10 and peripheral circuits, and outputs a 4.8V voltage signal, which serves as a voltage signal +5V_STY of a backup voltage source.

[0067] In this embodiment, the voltage conversion process is precisely controlled through the professional functions of the buck chip U8 and the boost chip U10, and the starting voltage of the boost chip U10 is less than the first preset voltage, ensuring that the boost circuit can start working when the energy storage capacitor C42 has a certain amount of electricity, effectively improving the availability and response speed of the backup power supply module, and enhancing the power supply guarantee capability of the data acquisition device in emergency situations.

[0068] Furthermore, the buck circuit also includes a first diode D11, the anode of the first diode D11 is connected to the power supply voltage source, and the cathode of the first diode D11 is respectively connected to the input end of the buck chip U8 and the enable end of the buck chip U8.

[0069] By adding the first diode D11 in the step-down circuit, the unidirectional conductivity of the diode is utilized to prevent current backflow, protect the main power module, and improve the stability and reliability of the step-down circuit.

[0070] In some embodiments, as Figure 3 As shown, the power supply switching module includes a first PMOS transistor Q3, a second diode D9 and a first resistor R5. The source of the first PMOS transistor Q3 is connected to the backup voltage source, the gate of the first PMOS transistor Q3 is connected to the power supply voltage source, the anode of the second diode D9 and the first end of the first resistor R5 respectively, the second end of the first resistor R5 is grounded, and the drain of the first PMOS transistor Q3 is connected to the cathode of the second diode D9 and the back-end circuit respectively. The data acquisition module and the data transmission module are powered by the back-end circuit.

[0071] Specifically, the voltage signal +5V_M of the power supply voltage source and the voltage signal +5V_STY of the standby voltage source pass through the power supply switching module. When the voltage signal +5V_M of the power supply voltage source is powered, the first PMOS transistor Q3 is turned off, and the voltage signal +5V_M of the power supply voltage source is supplied to the back-end data acquisition module and data transmission module via the second diode D9. When the voltage signal +5V_M of the power supply voltage source is missing, that is, when the main power module is powered off, the first PMOS transistor Q3 is turned on, and the voltage signal +5V_STY of the standby voltage source is supplied to the back-end data acquisition module and data transmission module via the first PMOS transistor Q3. At the same time, due to the reverse cutoff of the second diode D9, the back-end current can be prevented from flowing back to the main power module.

[0072] The overall working principle of the power switching module, main power module, and backup power module is as follows:

[0073] In the initial state, the positive voltage of the energy storage capacitor C42 is 0, and the voltage signal of the power supply voltage source is

[0074] +5V_M has two paths, one path provides normal power supply to the back end through the power supply switching module, and the other path charges the energy storage capacitor C42 through the step-down circuit. The positive voltage of the energy storage capacitor C42 rises slowly, and finally the positive voltage of the energy storage capacitor C42 is equal to the output voltage of the step-down circuit, which is 2.4V.

[0075] The boost circuit's startup voltage is 0.85V. When the positive voltage of energy storage capacitor C42 exceeds this voltage, the boost circuit starts, converting the positive voltage of energy storage capacitor C42 to a 4.8V +5V_STY voltage signal, which serves as the backup voltage source's +5V_STY signal. When the main power module is supplying power normally, the backup voltage source's +5V_STY signal is disconnected from the back-end circuitry due to the power switching module.

[0076] When the main power module is powered off, the power switching module switches to the voltage signal of the backup voltage source

[0077] +5V_STY supplies power, and the electricity stored in the energy storage capacitor C42 supplies power to the back end through the boost circuit until the voltage value of the energy storage capacitor C42 drops below 0.85V.

[0078] In this embodiment, automatic switching between the primary and backup power supplies is achieved through the coordinated operation of the first PMOS transistor Q3, the second diode D9, and the first resistor R5. When the power supply voltage source is normal, the first PMOS transistor Q3 is turned on to supply power to the data acquisition module and the data transmission module. When the power supply voltage source fails, the first PMOS transistor Q3 is turned off, and the backup voltage source supplies power to the data acquisition module and the data transmission module via the second diode D9 and the back-end circuit, thereby ensuring the continuity and reliability of power supply. In addition, the circuit structure is relatively simple and easy to implement.

[0079] In some embodiments, the data acquisition device for the energy storage system further includes an encryption module, which includes an encryption chip, and the system data information is encrypted by the encryption chip.

[0080] Specifically, the encryption module is based on an encryption chip, ensuring unique encryption and data immutability. Encryption is used to encrypt and sign collected information, including data forwarding and data storage, all of which pass through the encryption module. The corresponding decryption key is required to verify the authenticity of the corresponding information.

[0081] By adding an encryption module and using an encryption chip to encrypt system data information, the risk of data leakage during collection, transmission and storage is effectively prevented, ensuring the data security and privacy of the energy storage system.

[0082] In some embodiments, the data acquisition device for the energy storage system further includes a data processing module, which is used to pre-process the collected system data information.

[0083] Specifically, the received data is pre-processed, including illegality judgment, over-limit judgment and alarm judgment, so as to further improve the security of data collected by the data collection device for the energy storage system.

[0084] Furthermore, the data acquisition device for the energy storage system also includes a main power monitoring circuit, the input end of the main power monitoring circuit is connected to the power supply voltage source, and the output end of the main power monitoring circuit is connected to the data processing module. The main power monitoring circuit is used to collect the main power power-off signal to the data processing module, and the data processing module is also used to put the data acquisition device to sleep according to the main power power-off signal.

[0085] By putting the data acquisition device into sleep mode when the main power module loses power, the use time of the backup power supply is extended. When the main power module resumes power supply, the data acquisition device automatically returns to the state before the power outage to ensure the integrity of the collected data.

[0086] Furthermore, the data acquisition device for the energy storage system also includes a storage module, which is used to record system data information.

[0087] The storage module supports minute-level data storage, and by recording the collected data, it facilitates subsequent data calls and queries.

[0088] The addition of the storage module provides a reliable storage space for system data information, facilitating subsequent retrospective analysis, fault diagnosis, and data statistics of the energy storage system's operating status.

[0089] Furthermore, the data acquisition device for the energy storage system also includes a data statistics module, which is used to collect statistics on the power information in the system data information.

[0090] Specifically, the data statistics module can count the electricity information and power information of shared energy storage, providing users with intuitive electricity data, facilitating users to rationally arrange the use and scheduling of the energy storage system and improve the utilization efficiency of the energy storage system. At the same time, it also provides an important basis for the operation and management of the energy storage system, enhancing the practicality and user-friendliness of the device.

[0091] Furthermore, the data acquisition device for the energy storage system further includes a user interaction module, which is used to provide a web service, and a user queries system data information of the energy storage system based on the web service.

[0092] Specifically, the user interaction module allows users to query information about the energy storage system through web services. In one example, the web page display includes the following information:

[0093] (1) Display, monitor and compile statistics on energy storage related information of a single type;

[0094] (2) Information related to the sum of flywheel + lithium battery and supercapacitor + lithium battery;

[0095] (3) Basic information such as power station conversion efficiency and SOC also needs to be displayed and counted;

[0096] (4) Power station settlement and assessment information;

[0097] (5) Historical data query;

[0098] (6) Trusted authentication verification.

[0099] Through the user interaction module, users can easily and quickly query the system data information of the energy storage system through the network, without being restricted by location and time, greatly improving the user's monitoring and management efficiency of the energy storage system.

[0100] Although example embodiments and their advantages have been described in detail, those skilled in the art may make various changes, substitutions and modifications to these embodiments without departing from the spirit and scope of protection of the present invention, and such modifications and variations are all within the scope defined therein.

Claims

1. A data acquisition device for an energy storage system, characterized in that: include: Data acquisition module, used to collect system data information of the energy storage system; A data sending module, used for forwarding the system data information; A main power supply module, used to convert an external input voltage into a power supply voltage source, and supply power to the data acquisition module and the data sending module through the power supply voltage source; a backup power supply module, configured to store electrical energy based on the power supply voltage source and convert the stored electrical energy into a backup voltage source; A power supply switching module is used to switch the backup voltage source to supply power to the data acquisition module and the data sending module when the power supply voltage source loses power.

2. The data acquisition device for an energy storage system according to claim 1, characterized in that: The backup power supply module includes a step-down circuit, an energy storage capacitor and a boost circuit. The step-down circuit is used to convert the power supply voltage source into a first preset voltage and charge the energy storage capacitor based on the first preset voltage. The boost circuit is used to convert the positive electrode voltage of the energy storage capacitor into the backup voltage source.

3. The data acquisition device for an energy storage system according to claim 2, characterized in that: The step-down circuit includes a step-down chip, and the boost circuit includes a boost chip. The input end of the step-down chip is connected to the power supply voltage source, the output end of the step-down chip is connected to the positive electrode of the energy storage capacitor, the positive electrode of the energy storage capacitor, the input end of the boost chip, and the enable end of the boost chip are connected. The step-down chip is used to convert the power supply voltage source into the first preset voltage and charge the energy storage capacitor based on the first preset voltage. The boost chip is used to convert the positive electrode voltage of the energy storage capacitor into the backup voltage source, wherein the starting voltage of the boost chip is less than the first preset voltage.

4. The data acquisition device for an energy storage system according to claim 3, characterized in that: The buck circuit further includes a first diode, an anode of the first diode is connected to the power supply voltage source, and a cathode of the first diode is respectively connected to the input end of the buck chip and the enable end of the buck chip.

5. The data acquisition device for an energy storage system according to claim 1, characterized in that: The power supply switching module includes a first PMOS transistor, a second diode and a first resistor. The source of the first PMOS transistor is connected to the backup voltage source, the gate of the first PMOS transistor is respectively connected to the power supply voltage source, the anode of the second diode and the first end of the first resistor, the second end of the first resistor is grounded, and the drain of the first PMOS transistor is respectively connected to the cathode of the second diode and the back-end circuit. The data acquisition module and the data sending module are powered by the back-end circuit.

6. The data acquisition device for an energy storage system according to claim 1, characterized in that: It also includes an encryption module, which includes an encryption chip, and encrypts the system data information through the encryption chip.

7. The data acquisition device for an energy storage system according to claim 1, characterized in that: It also includes a data processing module, which is used to pre-process the collected system data information.

8. The data acquisition device for an energy storage system according to claim 7, characterized in that: It also includes a main power monitoring circuit, the input end of the main power monitoring circuit is connected to the power supply voltage source, the output end of the main power monitoring circuit is connected to the data processing module, the main power monitoring circuit is used to collect the main power power-off signal to the data processing module, and the data processing module is also used to put the data acquisition device to sleep according to the main power power-off signal.

9. The data acquisition device for an energy storage system according to claim 1, characterized in that: It also includes a storage module, which is used to record the system data information.

10. The data acquisition device for an energy storage system according to claim 1, characterized in that: Also included is a data statistics module, the data statistics module is used to count the power information in the system data information; And / or, it further includes a user interaction module, wherein the user interaction module is used to provide a web service, and a user queries the system data information of the energy storage system based on the web service.

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