Energy storage system health state calculation method, product, equipment and medium
By real-time monitoring and dynamically adjusting the output power of the energy storage system and calculating its health status, the problem of low accuracy in the calculation of the health status of the energy storage system in the prior art is solved, and a more accurate and reliable health status assessment is achieved.
Patent Information
- Application Number
- CN202411438267.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-01-03
AI Technical Summary
In the prior art, the accuracy of the calculation of the health status of the energy storage system is low, especially the poor adaptability under different types of energy storage systems and working conditions, resulting in inaccurate results.
By controlling the energy storage system to start discharge, the battery cell voltage, charging pile output power and liquid cooling system output power are obtained in real time, the total output power and the preset discharge power are calculated, the charging pile output is dynamically adjusted, and the discharge time is calculated based on the discharge time Healthy state to ensure load balancing and accuracy of the discharge process.
It improves the accuracy and reliability of the calculation of the health status of the energy storage system, ensures load balancing and accurate reflection of the health status of the discharge process, and reduces errors caused by changes in external factors.
Smart Images
Figure CN119239375A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of power storage and charging technology, and in particular to a method, product, device and medium for calculating the health status of an energy storage system. Background Art
[0002] With the development of new energy technologies, integrated storage and charging systems have been widely used. Energy storage systems play a key role in integrated storage and charging systems, and accurate calculation of their state of health (SOH) is crucial for the reliable operation and maintenance of the system.
[0003] In the related art, the health status of the energy storage system is evaluated by the method of empirical model or equivalent circuit model. Among them, the method based on the empirical model statistically analyzes the historical operation data of a large number of energy storage systems of the same type and establishes an empirical formula to estimate the health status. For example, a rough life prediction is given based on the relationship between the number of cycles and capacity attenuation of the energy storage system. This method does not require a complex physical model, but is limited by specific application scenarios and energy storage types. Different types of energy storage systems (such as lithium-ion batteries, supercapacitors, etc.) have different physical and chemical properties and failure mechanisms. This method has poor adaptability to energy storage systems under different working conditions, resulting in low accuracy of the results. The method based on the equivalent circuit model establishes an equivalent circuit model of the energy storage system, and infers the health status by monitoring the changes in circuit parameters (such as internal resistance, capacitance, etc.). However, the equivalent circuit model is often simplified and cannot fully reflect the complex physical and chemical processes of the energy storage system. The measurement of parameters is easily affected by noise and interference, resulting in inaccurate calculation results. Summary of the invention
[0004] In order to solve the problem of low accuracy in calculating the health status of an energy storage system in the prior art, the present application provides a method, product, device and medium for calculating the health status of an energy storage system.
[0005] In a first aspect, the present application provides a method for calculating the health status of an energy storage system, which adopts the following technical solutions: A method for calculating the health status of an energy storage system, comprising: Controlling the energy storage system to start discharging, and obtaining in real time the cell voltage of the energy storage system, the first output power of the charging pile to the electric vehicle, and the second output power of the energy storage system to the liquid cooling system; Obtaining a preset discharge power of the energy storage system, wherein the preset discharge power represents the output power of the energy storage system when the discharge current is a discharge rate; Calculating the sum of the first output power and the second output power to obtain a total output power, and comparing the total output power with the preset discharge power to obtain a comparison result; Dynamically adjust the output of the charging pile based on the comparison result; When the cell voltage reaches a preset cut-off voltage, the discharge duration of the energy storage system is determined, and the health state of the energy storage system is calculated based on the discharge duration.
[0006] By adopting the above technical solution, the capacity determination method of the standard battery cell is adopted in advance, and the initial capacity is determined based on the rated temperature and current size. The preset discharge power obtained ensures that the calculation benchmark has high accuracy and reliability. The charging pile is dynamically controlled and adjusted based on the comparison result of the sum of the first output power and the second output power obtained by real-time monitoring and the preset discharge power, which can ensure the load balancing of the energy storage system discharge process. By monitoring the battery cell voltage, the discharge of the energy storage system can be terminated in time, so as to obtain an accurate discharge duration for calculating the health status of the energy storage system. The present application can improve the accuracy of calculating the health status of the energy storage system.
[0007] In a preferred example, the present application may be further configured as follows: before controlling the energy storage system to start discharging, the method further includes: When the energy storage system is started and enters a standby state, obtaining an initial health state of the energy storage system; Every time the initial health state changes by a preset difference, a correction strategy is executed; The correction strategy includes: monitoring the charging state and system temperature of the energy storage system, and receiving the charging demand of the electric vehicle when the charging state indicates that the battery of the energy storage system is fully charged and the system temperature reaches the rated temperature; Accordingly, the controlling the energy storage system to start discharging includes: The energy storage system is controlled to start discharging based on the charging demand.
[0008] By adopting the above technical solution, the charging status and system temperature of the energy storage system are monitored in real time, and when the charging status and system temperature meet the conditions, the charging demand is received and the electric vehicle begins to be charged, ensuring the accuracy of the process from the start to the end of the discharge of the energy storage system, thereby improving the accuracy of the calculated health status.
[0009] In a preferred example, the present application may be further configured as follows: when the comparison result is that the total output power is less than the preset discharge power, dynamically adjusting the output of the charging pile based on the comparison result includes: Calculating a first power difference between the preset discharge power and the total output power; The charging pile is controlled to supply power to the municipal power grid according to the first power difference.
[0010] By adopting the above technical solution, when the total output power is less than the preset discharge power, the charging pile is controlled to start supplying power to the municipal power grid, thereby increasing the total output power of the energy storage system, improving the system load balance, and ensuring the stability of the discharge current during the power supply process of the energy storage system.
[0011] In a preferred example, the present application may be further configured as follows: when the comparison result is that the total output power is greater than the preset discharge power, dynamically adjusting the output of the charging pile based on the comparison result includes: Calculating a second power difference between the total output power and the preset discharge power; Calculating a third power difference between the first output power and the second power difference; The output power of the charging pile to the electric vehicle is adjusted from the first output power to the third power difference.
[0012] By adopting the above technical solution, when the total output power is greater than the preset discharge power, it is determined that the total output power of the energy storage system is too large, and the first output power corresponding to the charging pile is timely reduced, thereby improving the system load balance and ensuring the stability of the discharge current during the power supply process of the energy storage system.
[0013] In a preferred example, the present application can be further configured as follows: the charging pile is connected to the energy storage system and the electric vehicle, and is used to transmit the electricity discharged by the energy storage system to the electric vehicle; the liquid cooling system is connected to the energy storage system, and is used to control the system temperature of the energy storage system to remain at the rated temperature during the discharge of the energy storage system.
[0014] By adopting the above technical solution, the liquid cooling system is used to control the constant system temperature of the energy storage system during the discharge process, thereby ensuring the stability of conditions during the calculation process and reducing errors caused by changes in external factors.
[0015] In a preferred example, the present application may be further configured as follows: the calculating the health status of the energy storage system based on the discharge duration includes: Calculating the discharge capacity of the energy storage system based on the discharge duration; Obtaining the rated capacity of the energy storage system; The ratio of the discharged electricity to the rated capacity is calculated to obtain the health status of the energy storage system.
[0016] By adopting the above technical solution, the health status is calculated by accumulating the discharged electricity, which can accurately reflect the actual usage and capacity attenuation of the battery in the energy storage system, and improve the accuracy of the health status calculation results.
[0017] In a preferred example, the present application may be further configured as follows: obtaining the initial health status of the energy storage system includes: Obtaining the cycle life and current cycle number of the energy storage system; The ratio of the current cycle number to the cycle life is calculated to obtain the initial health state of the energy storage system.
[0018] By adopting the above technical solution, the initial health state is calculated based on the cycle life, and the obtained health state is compared with the initial health state, which helps to verify the accuracy of the calculation result.
[0019] In a second aspect, the present application provides a computer program product, which adopts the following technical solution: A computer program product includes a computer program. When the computer program is executed by a processor, the method for calculating the health status of an energy storage system as described in any one of the first aspects is implemented.
[0020] In a third aspect, the present application provides an electronic device, which adopts the following technical solution: one or more processors; Memory; At least one application, wherein the at least one application is stored in a memory and configured to be executed by at least one processor, and the at least one application is configured to: execute the method for calculating the health status of an energy storage system as described in any one of the first aspects.
[0021] In a fourth aspect, the present application provides a computer-readable storage medium, which adopts the following technical solution: A computer-readable storage medium stores a computer program thereon, and when the computer program is executed in a computer, the computer is caused to execute the method for calculating the health status of an energy storage system as described in any one of the first aspects.
[0022] In summary, this application includes the following beneficial technical effects: The present application adopts a capacity determination method of a standard battery cell in advance, determines the initial capacity based on the rated temperature and current, and obtains a preset discharge power, which ensures that the calculation benchmark has high accuracy and reliability. The charging pile is dynamically controlled and adjusted based on the comparison result of the sum of the first output power and the second output power obtained by real-time monitoring with the preset discharge power, which can ensure load balancing during the discharge process of the energy storage system. By monitoring the battery cell voltage, the discharge of the energy storage system can be terminated in time, thereby obtaining an accurate discharge duration for calculating the health status of the energy storage system, which can improve the accuracy of calculating the health status of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1It is a structural schematic diagram of a system for calculating the health status of an energy storage system provided in an embodiment of the present application; Figure 2 It is a flowchart of a method for calculating the health status of an energy storage system provided in an embodiment of the present application; Figure 3 is a power control flow chart provided in an embodiment of the present application; Figure 4 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION
[0024] The following is combined with Figure 1 -Attached Figure 4 This application is described in further detail.
[0025] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.
[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0027] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article, unless otherwise specified, generally means that the associated objects before and after are in an "or" relationship.
[0028] It should be noted that in the optional embodiments of the present application, the object information and other related data involved, when the embodiments in the present application are applied to specific products or technologies, need to obtain the permission or consent of the object, and the collection, use and processing of the relevant data need to comply with the relevant laws, regulations and standards of the relevant countries and regions. In other words, if the embodiments of the present application involve data related to the object, it needs to be obtained with the authorization and consent of the object, the authorization and consent of the relevant departments, and in compliance with the relevant laws, regulations and standards of the country and region. If personal information is involved in the embodiments, the acquisition of all personal information needs to obtain the consent of the individual. If sensitive information is involved, the separate consent of the information subject needs to be obtained. The embodiments also need to be implemented with the authorization and consent of the object.
[0029] The present application embodiment provides a system for calculating the health status of an energy storage system. Figure 1 As shown, the system includes: energy storage system, liquid cooling system, charging pile, municipal power grid, and electric vehicle.
[0030] The liquid cooling system is responsible for maintaining the appropriate operating temperature of the key equipment in the entire system, especially the battery pack in the energy storage system, to ensure its performance and life. The liquid cooling system contains liquid cooling pipes, which are used to achieve heat exchange through circulating coolant to ensure that the equipment does not overheat during operation. As the core power storage unit, the energy storage system is composed of high-performance battery packs, which can store electrical energy for charging electric vehicles and supplying power to the municipal power grid. The charging pile is an interface connecting electric vehicles and the power supply system. It has the function of transmitting the power of the energy storage system or the municipal power grid to electric vehicles, and supports different charging modes and standards. As a consumer of electricity, electric vehicles obtain the required electricity by connecting to the charging pile to meet daily driving needs. The energy storage system, liquid cooling system, charging pile, municipal power grid, and electric vehicles can exchange information through wired or wireless communication, and can transmit information such as charging requirements, power supply status, and equipment operating parameters; electronic equipment can communicate with the energy storage system, liquid cooling system, charging pile, municipal power grid, and electric vehicles through wired or wireless methods to complete information transmission and coordinated control.
[0031] When the energy storage system charges the electric vehicle, the tram user parks the vehicle next to the charging pile equipped with the energy storage system and inserts the charging plug into the tram charging interface. The charging pile can automatically identify the battery type, remaining power and charging requirements of the tram. The charging requirements include the charging current and charging voltage information adapted to the electric vehicle. The energy storage system receives the charging request from the charging pile, and the liquid cooling system begins to strengthen the cooling of the battery pack of the energy storage system to ensure that the battery temperature is stable during the charging process. According to the charging requirements of the tram, the energy storage system outputs an appropriate amount of direct current to the tram through the charging pile to start the charging process. During the charging process, the electronic equipment monitors the charging status in real time, including the charging current, voltage, battery temperature and charged amount, and feeds back these data to the energy storage system and the charging pile. When the tram battery is fully charged, the electronic equipment notifies the energy storage system and the charging pile to stop charging, the charging pile automatically cuts off the power, and the user unplugs the charging plug to complete the charging process.
[0032] When the energy storage system supplies power to the municipal power grid, the municipal power grid detects peak power consumption or insufficient power supply and sends a power supply request to the energy storage system and charging piles. After the energy storage system receives the power supply instruction, the liquid cooling system adjusts the working mode to adapt to the heat dissipation requirements during the discharge process. The energy storage system converts the stored DC power into AC power through the power transmission line, and adjusts the voltage and frequency according to the requirements of the municipal power grid. The AC power is transmitted to the municipal power grid through the power transmission line to meet the power demand of the power grid. Electronic equipment continuously monitors various parameters in the power supply process to ensure stable and safe power supply. When the power demand of the municipal power grid is met, or the power of the energy storage system drops to the set threshold, the municipal power grid issues a stop power supply instruction, and the energy storage system stops supplying power to the grid.
[0033] During the charging and discharging process of the energy storage system, the liquid cooling system always maintains efficient operation to ensure battery performance and system stability, while the electronic equipment monitors and coordinates the work of each part in real time to ensure that the entire process is carried out safely, efficiently and stably.
[0034] The present application embodiment provides a method for calculating the health status of an energy storage system. Figure 2 As shown, the method provided in the embodiment of the present application is executed by an electronic device, which can be a server or a terminal device, wherein the server can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services. The terminal device can be a smart phone, a tablet computer, a laptop computer, a desktop computer, etc., but is not limited thereto. The terminal device and the server can be directly or indirectly connected via wired or wireless communication, which is not limited in the embodiment of the present application. The method includes steps S201 to S205, wherein: S201, controlling the energy storage system to start discharging, and obtaining in real time the cell voltage of the energy storage system, the first output power of the charging pile to the electric vehicle, and the second output power of the energy storage system to the liquid cooling system.
[0035] Before the electronic device controls the energy storage system to start discharging, it monitors the charging state and system temperature of the energy storage system. When the charging state of the energy storage system is that the battery is fully charged and the system temperature reaches the rated temperature, it indicates that the energy storage system meets the discharge requirements. At this time, the electronic device monitors the charging demand of the electric vehicle in real time. When there is a charging demand, the electronic device controls the energy storage system to start discharging and records the time when the discharge starts.
[0036] Specifically, a temperature sensor line can be set to connect the energy storage system battery pack and the temperature sensor, and the temperature sensor is used to monitor the system temperature of the system in real time. The cell voltage of the energy storage system can be read by a voltmeter directly connected to the cell, and the cell voltage can also be collected by the integrated chip of the battery management system. A power conversion system can be set to connect the output port of the energy storage system and the charging pile to obtain the first output power P of the charging pile to the electric vehicle. C And the second output power P of the energy storage system to the liquid cooling system A .
[0037] S202: Obtain a preset discharge power of the energy storage system, where the preset discharge power represents the output power of the energy storage system when the discharge current is a discharge rate.
[0038] Among them, the rated capacity of the energy storage system usually refers to the total amount of electricity that the energy storage system can provide from full state to complete discharge under standard conditions (rated temperature, discharge rate 1C). The rated capacity can be determined by conducting a discharge test under standard conditions. The rated capacity of the energy storage system can be expressed in Ah. Assuming that the rated capacity of the energy storage system is 100Ah, the discharge rate of the energy storage system is 1C=100A, which means that the energy storage system with a rated capacity of 100Ah can discharge at a current of 100A for 1 hour.
[0039] The preset discharge power P of the energy storage system Ess It can be determined through experiments and stored in the electronic device in advance.
[0040] S203 , calculating the sum of the first output power and the second output power to obtain a total output power, and comparing the total output power with a preset discharge power to obtain a comparison result.
[0041] During the entire process from the start of discharge to the end of discharge of the energy storage system, the liquid cooling system automatically adjusts to keep the system temperature of the energy storage system at the rated temperature. This process is a dynamic adjustment, and the second output power P obtained by real-time monitoring A It also changes dynamically. Therefore, the total output power P is calculated C +P A And comparing and obtaining the comparison results is also a continuous process.
[0042] When the comparison result is P C +P A =P Ess When the charging pile is controlled to continue to output the first power P C Charging electric vehicles.
[0043] S204: Dynamically adjust the output of the charging pile based on the comparison result.
[0044] Specifically, the output of the charging pile is dynamically adjusted based on the comparison result, with the goal of making the discharge current of the energy storage system equal to the 1C current by controlling the output power of the charging pile.
[0045] When the comparison result is P C +P A >P Ess , it indicates that the power of the load (charging pile and liquid cooling system) connected to the energy storage system is too high. At this time, it is necessary to reduce the output power of the charging pile (i.e. the first output power P C ), so that P C +P A =P Ess .
[0046] When the comparison result is P C +P A <P Ess When , it indicates that the power of the load (charging pile and liquid cooling system) connected to the energy storage system is too low. At this time, the load power needs to be increased, but the output power of the charging pile is limited by the charging demand of the electric vehicle and cannot be increased indefinitely. Therefore, the charging pile can be used to discharge the municipal power grid. The output power of the charging pile to the municipal power grid is P G , so that P C +P A +P G =P Ess .
[0047] S205: When the cell voltage reaches a preset cut-off voltage, determine the discharge duration of the energy storage system, and calculate the health status of the energy storage system based on the discharge duration.
[0048] The preset cut-off voltage can be pre-set according to the system configuration of the energy storage system and stored in the electronic device. When the cell voltage of the energy storage system reaches the preset cut-off voltage, the energy storage system is controlled to stop discharging and the time of stopping discharging is recorded. The time difference between the start time of discharging and the stop time of discharging is used as the discharge duration of the energy storage system.
[0049] Furthermore, during the discharge process of the energy storage system, the discharge current of the energy storage system is maintained at 1C. Therefore, the discharge current corresponding to the discharge time is integrated and calculated, and the calculation result obtained represents the accumulated power during the discharge process of the energy storage system, that is, the discharge power. The ratio of the discharge power to the rated capacity is taken as the current health status of the energy storage system.
[0050] See also Figure 3 , which shows a power control flow chart provided in an embodiment of the present application.
[0051] The embodiment of the present application pre-adopts a method for determining the capacity of a standard battery cell, determines the initial capacity based on the rated temperature and current, and obtains a preset discharge power that ensures that the calculated benchmark has high accuracy and reliability. The charging pile is dynamically controlled and adjusted based on a comparison result of the sum of the first output power and the second output power obtained by real-time monitoring with the preset discharge power, thereby ensuring load balancing during the discharge process of the energy storage system. By monitoring the battery cell voltage, the discharge of the energy storage system can be terminated in time, thereby obtaining an accurate discharge duration for calculating the health status of the energy storage system. The present application can improve the accuracy of calculating the health status of the energy storage system.
[0052] In a possible implementation of the embodiment of the present application, a charging pile is connected to an energy storage system and an electric vehicle to transmit the electricity discharged by the energy storage system to the electric vehicle; a liquid cooling system is connected to the energy storage system to control the system temperature of the energy storage system to remain at a rated temperature during the discharge of the energy storage system.
[0053] In the embodiment of the present application, the liquid cooling system controls the energy storage system to maintain a constant system temperature during the discharge process, thereby ensuring stable conditions during the calculation process and reducing errors caused by changes in external factors.
[0054] In a possible implementation of the embodiment of the present application, before controlling the energy storage system to start discharging, the method further includes: When the energy storage system starts and enters the standby state, the initial health status of the energy storage system is obtained; The initial health status changes by a preset difference each time, and a correction strategy is executed; Among them, the correction strategy includes: monitoring the charging state and system temperature of the energy storage system, and receiving the charging demand of the electric vehicle when the charging state is that the battery of the energy storage system is fully charged and the system temperature reaches the rated temperature; Accordingly, the energy storage system is controlled to start discharging, including: The energy storage system is controlled to start discharging based on charging demand.
[0055] In this embodiment, the initial health state of the energy storage system can be calculated by the cycle life and expressed as a percentage, ranging from 0% to 100%. The preset difference can be flexibly set according to actual needs and stored in the electronic device. Optionally, the preset difference can be 1%. Every time the initial health state changes by 1%, the correction strategy is started. The correction strategy also includes controlling the discharge of the energy storage system according to the charging demand of the electric vehicle, and calculating the health state of the energy storage system after the discharge is completed.
[0056] The embodiment of the present application monitors the charging status and system temperature of the energy storage system in real time, and receives charging demand and starts charging the electric vehicle when the charging status and system temperature meet the conditions, thereby ensuring the accuracy of the process from the start to the end of the discharge of the energy storage system, thereby improving the accuracy of the calculated health status.
[0057] A possible implementation of the embodiment of the present application is to obtain an initial health status of the energy storage system, including: Obtain the cycle life and current cycle number of the energy storage system; The ratio of the current cycle number and the cycle life is calculated to obtain the initial health status of the energy storage system.
[0058] Specifically, the cycle life of the energy storage system can be determined from the configuration information of the energy storage system, and the current cycle number can be obtained from the historical operation data of the energy storage system.
[0059] The embodiment of the present application calculates the initial health state based on the cycle life, and compares the obtained health state with the initial health state, which helps to verify the accuracy of the calculation result.
[0060] A possible implementation of the embodiment of the present application is that when the comparison result shows that the total output power is less than the preset discharge power, the output of the charging pile is dynamically adjusted based on the comparison result, including: Calculating a first power difference between a preset discharge power and a total output power; The charging pile is controlled to supply power to the municipal power grid according to the first power difference.
[0061] In the embodiment of the present application, when the total output power is less than the preset discharge power, the charging pile is controlled to start supplying power to the municipal power grid, thereby increasing the total output power of the energy storage system, improving the system load balance, and ensuring the stability of the discharge current during the power supply process of the energy storage system.
[0062] A possible implementation of the embodiment of the present application is that when the comparison result shows that the total output power is greater than the preset discharge power, the output of the charging pile is dynamically adjusted based on the comparison result, including: Calculating a second power difference between the total output power and the preset discharge power; Calculate a third power difference between the first output power and the second power; The output power of the charging pile to the electric vehicle is adjusted from the first output power to the third power difference.
[0063] When the total output power is greater than the preset discharge power, the embodiment of the present application determines that the total output power of the energy storage system is too large, and promptly adjusts the first output power corresponding to the charging pile to improve the system load balance and ensure the stability of the discharge current during the power supply process of the energy storage system.
[0064] A possible implementation of the embodiment of the present application is to calculate the health status of the energy storage system based on the discharge duration, including: Calculate the discharge capacity of the energy storage system based on the discharge duration; Obtain the rated capacity of the energy storage system; Calculate the ratio of discharged power to rated capacity to obtain the health status of the energy storage system.
[0065] Specifically, the initial health state of the energy storage system can be updated after each cycle of the energy storage system. When the start condition of the correction strategy is met, the health state of the energy storage system at the current moment is obtained by executing the correction strategy, and the health state is compared with the initial health state. If the health state is equal to the initial health state, the initial health state is not changed. If the health state is not equal to the initial health state, it indicates that the initial health state is inaccurate, and the health state replaces the initial health state.
[0066] The embodiment of the present application accumulates the discharged electricity to calculate the health status, which can accurately reflect the actual usage and capacity attenuation of the battery of the energy storage system, and improves the accuracy of the health status calculation result.
[0067] Two specific examples are given below to illustrate the specific implementation process of a method for calculating the health status of an energy storage system provided in this application.
[0068] Example 1: The standard capacity of a certain energy storage system is defined as 100Ah battery capacity and 1C=100A output current at 25°C. The rated capacity of the energy storage system is 100Ah, and the initial battery remaining life (initial health status) SOH1 is 80%. During operation, the system monitors the battery charging status and system temperature in real time. When the battery is fully charged and the system temperature reaches the rated temperature TC = 25°C, the output power of the charging pile is dynamically controlled to make the current of the energy storage system equal to 1C=100A. When the charging pile is charging the electric vehicle, the output power P of the charging pile is 1C=100A. C is 50kW, the power of other loads (liquid cooling system) is P A is 10kW, the total power of the energy storage system P Ess is 60kW, satisfying P C +P A =P Ess , the charging pile maintains this output power. During the discharge process, the discharge current is integrated and calculated by the current sensor to obtain the discharge capacity of the energy storage system, which is 80Ah. The health state (SOH2) of the energy storage system is calculated according to the formula: SOH2=(80 / 100)×100%=80%, which is consistent with the initial health state SOH1, and the initial health state is not changed.
[0069] Example 2: The standard capacity of a certain energy storage system is defined as 200Ah at 20°C, and the marked output current is 1C=200A. The rated capacity of the energy storage system is 200Ah, and the initial health status SOH1 is 70%. During operation, the system monitors the battery charging status and system temperature in real time. When the battery is fully charged and the system temperature reaches the rated temperature TC=20°C, the output power of the charging pile is dynamically controlled to make the current of the energy storage system equal to 1C=200A. When the charging pile is charging the electric vehicle, the output power P of the charging pile is 200A. C is 40kW, the power of other loads P A is 20kW, the total power of the energy storage system P Ess is 70kW, at this time P C +P A <P Ess The charging pile chooses to discharge to the municipal grid additionally. Assuming that the output power P of the charging pile to the municipal grid is G is 10kW, satisfying P C +P A +P G =P Ess During the discharge process, the discharge current is integrated and calculated by the current sensor, and the discharge capacity of the energy storage system is 150 Ah. The battery health state (SOH2) is calculated according to the formula: SOH2=(150 / 200)×100%=75%, which is inconsistent with the initial health state SOH1. The initial health state is replaced with 75%.
[0070] It can be seen from the above embodiments that the method for calculating the health status of the energy storage system of the present invention can accurately calculate the remaining life of the energy storage system, and has high practicality and reliability. The charging and discharging strategy is optimized, and there is no need to consider the self-discharge rate, calendar life, such as charging and discharging depth, charging and discharging rate, ambient temperature change rate, etc., and there is no need to consider factors such as electrode materials, electrolytes, and charging and discharging mechanisms of different types of energy storage systems, which can improve the accuracy, versatility, and real-time performance of the estimation. The steps of the entire calculation process are clear and easy to understand and execute. From the system startup to the normal operating state to obtain the initial health status, to the power adjustment and discharge process according to different situations, and finally to the calculation of the health status through a relatively intuitive formula, in the calculation process, there is no need to involve a large number of complex calculations and iterative processes, and there is no need to perform high-dimensional matrix operations or complex numerical analysis. The calculation process is simple, and the calculation efficiency and accuracy are high.
[0071] An embodiment of the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, the contents shown in the above-mentioned embodiment of the method for calculating the health status of an energy storage system are implemented.
[0072] An electronic device is provided in an embodiment of the present application, such as Figure 4 As shown, Figure 4 The electronic device 400 shown includes: a processor 401 and a memory 403. The processor 401 and the memory 403 are connected, such as through a bus 402. Optionally, the electronic device 400 may also include a transceiver 404. It should be noted that in actual applications, the transceiver 404 is not limited to one, and the structure of the electronic device 400 does not constitute a limitation on the embodiments of the present application.
[0073] Processor 401 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. Processor 401 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.
[0074] The bus 402 may include a path to transmit information between the above components. The bus 402 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus 402 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one thick line is used in the diagram, but it does not mean that there is only one bus or only one type of bus.
[0075] The memory 403 may be a ROM (Read Only Memory) or other types of static storage devices that can store static information and instructions, a RAM (Random Access Memory) or other types of dynamic storage devices that can store information and instructions, or an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory) or other optical disk storage, optical disk storage (including compressed optical disk, laser disk, optical disk, digital versatile disk, Blu-ray disk, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.
[0076] The memory 403 is used to store the application code for executing the solution of the present application, and the execution is controlled by the processor 401. The processor 401 is used to execute the application code stored in the memory 403 to implement the contents shown in the embodiment of the above-mentioned energy storage system health status calculation method.
[0077] Figure 4 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.
[0078] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer-readable storage medium is run on a computer, the computer can execute the contents shown in the embodiment of the aforementioned method for calculating the health status of an energy storage system.
[0079] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.
[0080] The above are only some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.
Claims
1. A method for calculating the health status of an energy storage system, characterized in that: include: Controlling the energy storage system to start discharging, and obtaining in real time the cell voltage of the energy storage system, the first output power of the charging pile to the electric vehicle, and the second output power of the energy storage system to the liquid cooling system; Obtaining a preset discharge power of the energy storage system, wherein the preset discharge power represents the output power of the energy storage system when the discharge current is a discharge rate; Calculating the sum of the first output power and the second output power to obtain a total output power, and comparing the total output power with the preset discharge power to obtain a comparison result; Dynamically adjust the output of the charging pile based on the comparison result; When the cell voltage reaches a preset cut-off voltage, the discharge duration of the energy storage system is determined, and the health state of the energy storage system is calculated based on the discharge duration.
2. The method for calculating the health status of an energy storage system according to claim 1, characterized in that: Before controlling the energy storage system to start discharging, the method further includes: When the energy storage system is started and enters a standby state, obtaining an initial health state of the energy storage system; Every time the initial health state changes by a preset difference, a correction strategy is executed; The correction strategy includes: monitoring the charging state and system temperature of the energy storage system, and receiving the charging demand of the electric vehicle when the charging state indicates that the battery of the energy storage system is fully charged and the system temperature reaches the rated temperature; Accordingly, the controlling the energy storage system to start discharging includes: The energy storage system is controlled to start discharging based on the charging demand.
3. The method for calculating the health status of an energy storage system according to claim 1, characterized in that: When the comparison result is that the total output power is less than the preset discharge power, dynamically adjusting the output of the charging pile based on the comparison result includes: Calculating a first power difference between the preset discharge power and the total output power; The charging pile is controlled to supply power to the municipal power grid according to the first power difference.
4. The method for calculating the health status of an energy storage system according to claim 1, characterized in that: When the comparison result is that the total output power is greater than the preset discharge power, dynamically adjusting the output of the charging pile based on the comparison result includes: Calculating a second power difference between the total output power and the preset discharge power; Calculating a third power difference between the first output power and the second power difference; The output power of the charging pile to the electric vehicle is adjusted from the first output power to the third power difference.
5. The method for calculating the health status of an energy storage system according to claim 1, characterized in that: The charging pile is connected to the energy storage system and the electric vehicle, and is used to transmit the electricity discharged by the energy storage system to the electric vehicle; the liquid cooling system is connected to the energy storage system, and is used to control the system temperature of the energy storage system to remain at the rated temperature during the discharge of the energy storage system.
6. The method for calculating the health status of an energy storage system according to claim 1, characterized in that: The calculating the health status of the energy storage system based on the discharge duration includes: Calculating the discharge capacity of the energy storage system based on the discharge duration; Obtaining the rated capacity of the energy storage system; The ratio of the discharged electricity to the rated capacity is calculated to obtain the health status of the energy storage system.
7. The method for calculating the health status of an energy storage system according to claim 1, characterized in that: The obtaining of the initial health status of the energy storage system includes: Obtaining the cycle life and current cycle number of the energy storage system; The ratio of the current cycle number to the cycle life is calculated to obtain the initial health state of the energy storage system.
8. A computer program product, characterized in that It comprises a computer program, which, when executed by a processor, implements the steps of the method for calculating the health status of an energy storage system according to any one of claims 1 to 7.
9. An electronic device, characterized in that: include: at least one processor; Memory; At least one application, wherein the at least one application is stored in a memory and configured to be executed by at least one processor, and the at least one application is configured to: execute the method for calculating the health status of an energy storage system according to any one of claims 1-7.
10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed in a computer, the computer is caused to execute the method for calculating the health status of an energy storage system according to any one of claims 1 to 7.