WO2018145399A1 - Method for calibrating state of charge of energy storage system and device - Google Patents

Method for calibrating state of charge of energy storage system and device Download PDF

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Publication number
WO2018145399A1
WO2018145399A1 PCT/CN2017/092324 CN2017092324W WO2018145399A1 WO 2018145399 A1 WO2018145399 A1 WO 2018145399A1 CN 2017092324 W CN2017092324 W CN 2017092324W WO 2018145399 A1 WO2018145399 A1 WO 2018145399A1
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Prior art keywords
charge
cabinet
calibration
capacity
cell
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PCT/CN2017/092324
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French (fr)
Chinese (zh)
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鲍芳斌
岳洪亮
魏志立
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宁德时代新能源科技股份有限公司
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Publication of WO2018145399A1 publication Critical patent/WO2018145399A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC

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  • the invention belongs to the technical field of energy storage, and more particularly to a method and a device for calibrating the state of charge of an energy storage system.
  • the existing SOC estimation method has the following problems:
  • the main SOC estimation method is the ampere-time integration method.
  • the calculation accuracy of this method mainly depends on the initial state and the accuracy of the instantaneous current. Since the cell impedance between the parallel cabinets in the system cannot be completely consistent, this results in a certain difference between the charging and discharging currents between the system cabinets during charging and discharging. The current difference between the cabinets and the current sampling accuracy between each cabinet are also inconsistent. As a result, the calculated SOC value between each cabinet will have a certain deviation, and as time goes on, the deviation will be continuously The accumulation, the SOC deviation between the system parallel cabinets will become larger and larger. At present, it is mainly used to solve the method of averaging the SOC deviation between parallel cabinets.
  • the average calibration is to calibrate all cabinet SOCs to the average of all cabinets during calibration, but the values are calibrated with the battery.
  • the actual capacity error may be relatively large, and after the calibration, the cabinet SOC will reappear inconsistency as the system is charged and discharged. This is not conducive to energy management and power prediction of the system, and the user friendliness is also poor.
  • the present invention provides a method for calibrating a state of charge of an energy storage system, the energy storage system comprising a plurality of cabinets connected in parallel and accommodating a battery cell, including:
  • the cabinet calibration step includes: obtaining the charge and discharge capacity of the cells of each cabinet, and calculating the charge and discharge coefficient of the corresponding cells of each cabinet according to the charge and discharge capacity of the cells of each cabinet, according to the power of each cabinet
  • the charge and discharge capacity of the core and the charge and discharge coefficient of the battery are calibrated to the state of charge of the cells of each cabinet to obtain a state of charge after calibration;
  • the information transmitting step includes: transmitting a calibrated state of charge of the cells of each cabinet to a charge and discharge control device, wherein the charge and discharge control device is configured according to each of the calibrated state of charge of the cells of each cabinet The battery core of the cabinet is charged and discharged.
  • the cell charge and discharge coefficient includes a cell charge coefficient and a cell discharge coefficient, and the charge and discharge capacity is calculated according to the cell of each cabinet.
  • the corresponding cell charge and discharge coefficients of the cells of the cabinet including:
  • Cell charging coefficient of the cabinet to be calibrated preset constant ⁇ reference charging capacity / calibration charging capacity;
  • Cell discharge coefficient of the cabinet to be calibrated preset constant ⁇ reference discharge capacity / calibrated discharge capacity.
  • the method further includes:
  • the voltage detecting step includes: performing the cabinet calibration step when the number of cabinets with high voltage power is greater than or equal to the number of cabinets at low voltage, otherwise ending.
  • the cabinet calibration step specifically includes:
  • the charge and discharge capacity of each battery cell is obtained, according to each cabinet
  • the charge and discharge capacity of the battery cell calculates the corresponding charge and discharge coefficient of the battery cells of each cabinet, and the state of charge of each battery cell according to the charge and discharge capacity of each battery cell and the charge and discharge coefficient of the battery core. Calibrate to obtain the state of charge after calibration;
  • the process ends.
  • the method further includes:
  • the calculation process of the system charging state information includes: obtaining the cell temperature and the cell voltage of each cabinet, and calculating the energy storage system according to the charged state of the battery of each cabinet, the cell temperature, and the cell voltage. State of charge.
  • the present invention provides a state-of-charge calibration device for an energy storage system, the energy storage system comprising a plurality of cabinets connected in parallel and accommodating a battery cell, including:
  • the cabinet calibration module is configured to: obtain the charge and discharge capacity of the cells of each cabinet, and calculate a corresponding charge and discharge coefficient of the cells of each cabinet according to the charge and discharge capacity of the cells of each cabinet, according to each cabinet
  • the charge and discharge capacity of the battery core and the charge and discharge coefficient of the battery are calibrated to the state of charge of the cells of each cabinet to obtain a state of charge after calibration;
  • An information sending module is configured to: send a calibrated state of charge of the cells of each cabinet to a charge and discharge control device, wherein the charge and discharge control device is configured according to a state of charge of each cell of the cabinet after calibration The battery cells of the cabinet are charged and discharged.
  • the cell charge and discharge coefficient includes a cell charge coefficient and a cell discharge coefficient, and the charge and discharge capacity is calculated according to the cell of each cabinet.
  • the corresponding cell charge and discharge coefficients of the cells of the cabinet including:
  • Cell charging coefficient of the cabinet to be calibrated preset constant ⁇ reference charging capacity / calibration charging capacity;
  • Cell discharge coefficient of the cabinet to be calibrated preset constant ⁇ reference discharge capacity / calibrated discharge capacity.
  • the method further includes:
  • the voltage detecting module is configured to: when the number of cabinets that are powered on by the high voltage is greater than or equal to the number of cabinets in the low voltage line, execute the cabinet calibration module, otherwise, the module ends.
  • the cabinet calibration module specifically includes:
  • the charge and discharge capacity of each battery cell is obtained, according to each cabinet
  • the charge and discharge capacity of the battery cell calculates the corresponding charge and discharge coefficient of the battery cells of each cabinet, and the state of charge of each battery cell according to the charge and discharge capacity of each battery cell and the charge and discharge coefficient of the battery core. Calibrate to obtain the state of charge after calibration;
  • the process ends.
  • the method further includes:
  • the system charging state information calculation module is configured to: obtain the cell temperature and the cell voltage of each cabinet, and calculate the energy storage according to the charged state of the battery of each cabinet, the cell temperature, and the cell voltage. The state of charge of the system.
  • the charging state calibration method and device of the energy storage system of the present invention have the following effects:
  • the invention adds the cell charge and discharge coefficient Kx to calibrate in the process of system SOC calculation, calculates the cell charge and discharge coefficient Kx of each cabinet according to the historical charge and discharge state of the system, and then charges and discharges the charge and discharge cells.
  • the coefficient Kx is used to calibrate the SOC value of the system. Increasing the charge-discharge coefficient calibration during the system calculation of SOC can significantly improve the SOC consistency between the parallel cabinets of the system, and can be consistent throughout the charging and discharging process, so that the system SOC can more accurately reflect the true capacity of the battery. This enables the system to perform energy management and power prediction more reasonably.
  • FIG. 1 is a flow chart showing the operation of a method for calibrating a state of charge of an energy storage system according to the present invention.
  • FIG. 2 is a flow chart showing the operation of a preferred embodiment of a state of charge calibration method for an energy storage system of the present invention.
  • FIG. 3 is a block diagram of a device of a state of charge calibration device of an energy storage system according to the present invention.
  • a working flow chart of a method for calibrating a state of charge of an energy storage system includes a plurality of cabinets connected in parallel and accommodating cells, including:
  • Step S101 comprising: obtaining a charge and discharge capacity of a battery cell of each cabinet, and calculating a corresponding charge and discharge coefficient of the battery core of each cabinet according to a charge and discharge capacity of the battery core of each cabinet, according to the battery core of each cabinet
  • the charge and discharge capacity and the charge and discharge coefficient of the battery are calibrated to the state of charge of the cells of each cabinet to obtain a state of charge after calibration;
  • Step S102 comprising: transmitting a calibrated state of charge of the cells of each cabinet to a charge and discharge control device, wherein the charge and discharge control device is configured according to a state of charge of each cell of the cabinet to each of the cabinets The battery is charged and discharged.
  • Each of the cabinets houses a battery core, and in step S101, the charge and discharge capacity of the battery cells in the cabinet is obtained, and then the corresponding battery charge and discharge coefficients are calculated to calibrate the SOC. Then, in step S102, the calibrated SOC is sent to the charge and discharge control device, and the charge and discharge control device can perform charge and discharge control according to the calibrated SOC, so that the power of all the cabinets of the entire energy storage system is balanced.
  • the invention adds the cell charge and discharge coefficient Kx to calibrate in the process of system SOC calculation, calculates the cell charge and discharge coefficient Kx of each cabinet according to the historical charge and discharge state of the system, and then charges and discharges the charge and discharge cells.
  • the coefficient Kx is used to calibrate the SOC value of the system. Increasing the charge-discharge coefficient calibration during the system calculation of SOC can significantly improve the SOC consistency between the parallel cabinets of the system, and can be consistent throughout the charging and discharging process, so that the system SOC can more accurately reflect the true capacity of the battery. This enables the system to perform energy management and power prediction more reasonably.
  • the cell charge and discharge coefficient comprises a cell charging coefficient, a cell discharge coefficient, and the charging and discharging capacitance according to the cell of each cabinet. Calculate the corresponding cell charge and discharge coefficient of each cell's battery, including:
  • Cell charging coefficient of the cabinet to be calibrated preset constant ⁇ reference charging capacity / calibration charging capacity;
  • Cell discharge coefficient of the cabinet to be calibrated preset constant ⁇ reference discharge capacity / calibrated discharge capacity.
  • the charging and discharging cell charging and discharging coefficient Kx includes a cabinet charging calibration coefficient Kc and a cabinet discharge calibration coefficient Kd.
  • the clearing capacity command is sent by the main control cabinet to the slave control cabinet for calibration to calculate the capacity of the Kx in the cabinet; when the system is charged and discharged, the capacity of the Kx is continuously calculated from the control cabinet, and the main control cabinet sends and reads.
  • the n# cabinet is the cabinet to be calibrated, and the 1# cabinet is the reference cabinet.
  • the method further includes:
  • the voltage detecting step includes: when the number of cabinets that are powered on by the high voltage is greater than or equal to the number of cabinets in the low voltage line, the step S101 is performed; otherwise, the process ends.
  • the number of cabinets with high voltage power-on and the number of cabinets with low-voltage power are compared. Ensure the consistency of the state of the cells in all parallel cabinets of the energy storage system.
  • the step S101 includes:
  • the charge and discharge capacity of each battery cell is obtained, according to each cabinet
  • the charge and discharge capacity of the battery cell calculates the corresponding charge and discharge coefficient of the battery cells of each cabinet, and the state of charge of each battery cell according to the charge and discharge capacity of each battery cell and the charge and discharge coefficient of the battery core. Calibrate to obtain the state of charge after calibration;
  • the process ends.
  • the difference calibration threshold is preferably 3%
  • the charge and discharge capacity calibration threshold is preferably 0.05 coulomb (C).
  • This embodiment reduces unnecessary calibration by judging the difference between the maximum value and the minimum value and the charge and discharge capacity of a single cabinet.
  • the method further includes:
  • the calculation process of the system charging state information includes: obtaining the cell temperature and the cell voltage of each cabinet, and calculating the energy storage system according to the charged state of the battery of each cabinet, the cell temperature, and the cell voltage. State of charge.
  • the SOC value, the cell temperature, and the cell voltage of each cabinet are calculated by looking up the system SOC value at this time, and the corresponding query table is obtained by a large number of experiments from the corresponding cell.
  • This embodiment calculates the total state of charge of the energy storage system for energy management and power prediction of the system.
  • a working flow chart of a preferred embodiment of a method for calibrating a state of charge of an energy storage system according to the present invention includes:
  • step S201 when the number of high-voltage power-on cabinets is greater than or equal to the number of low-voltage online cabinets, step S202 is performed to perform cabinet SOC deviation calibration, otherwise, the process ends.
  • Step S202 after entering the cabinet SOC deviation calibration, detecting the difference between the maximum and minimum SOC between all the cabinets. When the difference is greater than 3%, the process proceeds to step S203 to perform Kx calibration, otherwise, the process ends.
  • step S203 the charge and discharge capacity of each parallel cabinet is read. If the charge and discharge capacity of each cabinet is greater than 0.05C, the condition for calculating the calibration coefficient Kx is satisfied, and the calibration coefficient Kx is calculated from the read charge and discharge capacity.
  • the calibration coefficient Kx is divided into a charging coefficient Kc and a discharging coefficient Kd.
  • step S204 the total SOC value of the energy storage system at this time is calculated by looking up the SOC value, the cell temperature and the cell voltage of each cabinet, and the corresponding query table has corresponding batteries obtained through a large number of experiments.
  • Step S205 the calculated calibration SOC value is provided to the control device of the energy storage system for operation and use.
  • a device module diagram of a state-of-charge calibration device for an energy storage system includes a plurality of cabinets connected in parallel and accommodating cells, including:
  • the cabinet calibration module 301 is configured to: obtain a charge and discharge capacity of the cells of each cabinet, and calculate a corresponding charge and discharge coefficient of the cells of each cabinet according to the charge and discharge capacity of the cells of each cabinet, according to each cabinet
  • the charge and discharge capacity of the battery cell and the charge and discharge coefficient of the battery are calibrated to the state of charge of the cells of each cabinet to obtain a state of charge after calibration;
  • the information sending module 302 is configured to: send the calibrated state of charge of the cells of each cabinet to the charge and discharge control device, wherein the charge and discharge control device is configured according to the state of charge of each cell of the cabinet after calibration The battery cells of the cabinet are charged and discharged.
  • the cell charge and discharge coefficient includes a cell charge coefficient and a cell discharge coefficient, and the charge and discharge capacity is calculated according to the cells of each cabinet.
  • the corresponding cell charge and discharge coefficient of each cell's battery including:
  • Cell charging coefficient of the cabinet to be calibrated preset constant ⁇ reference charging capacity / calibration charging capacity;
  • Cell discharge coefficient of the cabinet to be calibrated preset constant ⁇ reference discharge capacity / calibrated discharge capacity.
  • the method further includes:
  • the voltage detecting module is configured to: when the number of cabinets that are powered on by the high voltage is greater than or equal to the number of cabinets in the low voltage line, execute the cabinet calibration module, otherwise, the module ends.
  • the cabinet calibration module specifically includes:
  • the charge and discharge capacity of each battery cell is obtained, according to each cabinet
  • the charge and discharge capacity of the battery cell calculates the corresponding charge and discharge coefficient of the battery cells of each cabinet, and the state of charge of each battery cell according to the charge and discharge capacity of each battery cell and the charge and discharge coefficient of the battery core. Calibrate to obtain the state of charge after calibration;
  • the difference is less than the preset difference calibration threshold or the charge and discharge capacity of the battery of any cabinet is less than The preset charge and discharge capacity calibration threshold ends.
  • the method further includes:
  • the system charging state information calculation module is configured to: obtain the cell temperature and the cell voltage of each cabinet, and calculate the energy storage according to the charged state of the battery of each cabinet, the cell temperature, and the cell voltage. The state of charge of the system.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

A method for calibrating a state of charge of an energy storage system, the energy storage system comprising a plurality of machine cabinets which are connected in parallel and which accommodate battery cores. The method comprises: acquiring a charge and discharge capacity of a battery core of each machine cabinet, calculating a battery core charge and discharge coefficient corresponding to the battery core of each machine cabinet according to the charge and discharge capacity of the battery core of each machine cabinet, and according to the charge and discharge capacity and the battery core charge and discharge coefficient of the battery core of each machine cabinet, then calibrating a state of charge of the battery core of each machine cabinet to obtain a calibrated state of charge (S101); sending the calibrated state of charge of the battery core of each machine cabinet to a charge and discharge control device, the charge and discharge control device performing charge and discharge control on the battery core of each machine cabinet according to the calibrated state of charge of the battery core of each machine cabinet (S102). A battery core charge and discharge coefficient Kx is added during a process of the energy saving system performing state of charge (SOC) calculation to perform calibration, which may improve SOC consistency between machine cabinets which are connected in parallel in the system.

Description

储能系统的荷电状态校准方法、装置Method and device for calibrating state of charge of energy storage system 技术领域Technical field
本发明属于储能技术领域，更具体地说，本发明涉及一种储能系统的荷电状态校准方法、装置。The invention belongs to the technical field of energy storage, and more particularly to a method and a device for calibrating the state of charge of an energy storage system.
背景技术Background technique
大型储能系统被认为在支撑风能和太阳能等可再生能源普及中具有不可或缺的重要作用。随着风力、光伏等可再生能源发电和智能电网产业的迅速发展，大型储能系统成为万众瞩目的焦点。随着大型储能系统不断的投入使用，其荷电状态(State of Charge，SOC)计算不够准确和机柜之间的SOC偏差比较大的问题也就暴露出来了。Large energy storage systems are considered to be an indispensable and important role in supporting the proliferation of renewable energy such as wind and solar energy. With the rapid development of renewable energy generation such as wind power and photovoltaics and the smart grid industry, large-scale energy storage systems have become the focus of attention. With the continuous use of large-scale energy storage systems, the problem of insufficient calculation of the state of charge (SOC) and the large SOC deviation between cabinets is exposed.
现有SOC估算方法存在如下问题：The existing SOC estimation method has the following problems:
目前主要使用的SOC估算方法是安时积分法，该方法计算精度主要依赖初始状态和瞬时电流的精度。由于系统中并联机柜之间的电芯阻抗无法做到完全一致，这就导致了充放电的时候系统机柜之间的充放电电流会存在一定的差异。机柜间本身的电流差异再加上每个机柜之间的电流采样精度也不一致，最终导致每个机柜之间计算得到SOC值会存在一定的偏差，并且随着时间的不断延长，偏差会被不断的累加，系统并联机柜之间的SOC偏差就会越来越大。目前主要被用于解决并联机柜间SOC偏差大的方法平均值校准法，平均值校准是可以在校准的时候把所有的机柜SOC校准为所有机柜的平均值，但是这样校准出来的值与电池的实际容量误差可能会比较大，并且在校准后随着系统的充放电运行机柜SOC会重新出现不一致的情况，这样不利于对系统进行能量管理和功率预测，用户友好度也比较差。At present, the main SOC estimation method is the ampere-time integration method. The calculation accuracy of this method mainly depends on the initial state and the accuracy of the instantaneous current. Since the cell impedance between the parallel cabinets in the system cannot be completely consistent, this results in a certain difference between the charging and discharging currents between the system cabinets during charging and discharging. The current difference between the cabinets and the current sampling accuracy between each cabinet are also inconsistent. As a result, the calculated SOC value between each cabinet will have a certain deviation, and as time goes on, the deviation will be continuously The accumulation, the SOC deviation between the system parallel cabinets will become larger and larger. At present, it is mainly used to solve the method of averaging the SOC deviation between parallel cabinets. The average calibration is to calibrate all cabinet SOCs to the average of all cabinets during calibration, but the values are calibrated with the battery. The actual capacity error may be relatively large, and after the calibration, the cabinet SOC will reappear inconsistency as the system is charged and discharged. This is not conducive to energy management and power prediction of the system, and the user friendliness is also poor.
发明内容 Summary of the invention
本发明的目的在于：提供一种能准确校准机柜SOC的储能系统的荷电状态校准方法、装置。It is an object of the present invention to provide a method and apparatus for charging state of an energy storage system capable of accurately calibrating a cabinet SOC.
为了实现上述发明目的，本发明提供一种储能系统的荷电状态校准方法，所述储能系统包括多个并联且容置电芯的机柜，包括：In order to achieve the above object, the present invention provides a method for calibrating a state of charge of an energy storage system, the energy storage system comprising a plurality of cabinets connected in parallel and accommodating a battery cell, including:
机柜校准步骤，包括：获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，根据每个机柜的电芯的充放电容量、电芯充放电系数对每个机柜的电芯的荷电状态进行校准得到校准后荷电状态；The cabinet calibration step includes: obtaining the charge and discharge capacity of the cells of each cabinet, and calculating the charge and discharge coefficient of the corresponding cells of each cabinet according to the charge and discharge capacity of the cells of each cabinet, according to the power of each cabinet The charge and discharge capacity of the core and the charge and discharge coefficient of the battery are calibrated to the state of charge of the cells of each cabinet to obtain a state of charge after calibration;
信息发送步骤，包括：将每个机柜的电芯的校准后荷电状态发送至充放电控制装置，所述充放电控制装置根据每个机柜的电芯的校准后荷电状态对每个所述机柜的电芯进行充放电控制。The information transmitting step includes: transmitting a calibrated state of charge of the cells of each cabinet to a charge and discharge control device, wherein the charge and discharge control device is configured according to each of the calibrated state of charge of the cells of each cabinet The battery core of the cabinet is charged and discharged.
作为本发明储能系统的荷电状态校准方法的一种改进，所述电芯充放电系数包括电芯充电系数、电芯放电系数，所述根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，包括：As an improvement of the state of charge calibration method of the energy storage system of the present invention, the cell charge and discharge coefficient includes a cell charge coefficient and a cell discharge coefficient, and the charge and discharge capacity is calculated according to the cell of each cabinet. The corresponding cell charge and discharge coefficients of the cells of the cabinet, including:
选择一个机柜作为基准机柜，将基准机柜以外的机柜作为待校准机柜，对于每个待校准机柜，执行如下操作：Select one cabinet as the reference cabinet and the cabinet other than the reference cabinet as the cabinet to be calibrated. For each cabinet to be calibrated, do as follows:
对待校准机柜用于进行校准的充电容量和放电容量进行清零；The charging capacity and discharge capacity used for calibration in the calibration cabinet are cleared;
当待校准机柜用于进行校准的充电容量和放电容量都大于预设校准容量阈值时；When the charging capacity and the discharging capacity of the cabinet to be calibrated for calibration are greater than a preset calibration capacity threshold;
获取该时刻待校准机柜用于进行校准的充电容量作为校准充电容量、该时刻待校准机柜用于进行校准的放电容量作为校准放电容量，获取该时刻基准机柜用于进行校准的充电容量作为基准充电容量、该时刻基准机柜用于进行校准的放电容量作为基准放电容量；Obtaining the charging capacity for calibration in the cabinet to be calibrated at this time as the calibration charging capacity, and the discharging capacity for calibration in the cabinet to be calibrated at that time is used as the calibration discharge capacity, and the charging capacity used for calibration in the reference cabinet at this time is obtained as the reference charging. Capacity, the discharge capacity used by the reference cabinet for calibration at this time as the reference discharge capacity;
待校准机柜的电芯充电系数＝预设常量×基准充电容量/校准充电容量；Cell charging coefficient of the cabinet to be calibrated = preset constant × reference charging capacity / calibration charging capacity;
待校准机柜的电芯放电系数＝预设常量×基准放电容量/校准放电容量。 Cell discharge coefficient of the cabinet to be calibrated = preset constant × reference discharge capacity / calibrated discharge capacity.
作为本发明储能系统的荷电状态校准方法的一种改进，还包括：As an improvement of the state of charge calibration method of the energy storage system of the present invention, the method further includes:
电压检测步骤，包括：当高压上电的机柜的数量大于或等于低压在线的机柜的数量时，执行所述机柜校准步骤，否则结束。The voltage detecting step includes: performing the cabinet calibration step when the number of cabinets with high voltage power is greater than or equal to the number of cabinets at low voltage, otherwise ending.
作为本发明储能系统的荷电状态校准方法的一种改进，所述机柜校准步骤，具体包括：As an improvement of the charging state calibration method of the energy storage system of the present invention, the cabinet calibration step specifically includes:
获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯的荷电状态，计算所有荷电状态的最大值与所有荷电状态的最小值的差值；Obtain the charge and discharge capacity of the cells of each cabinet, calculate the state of charge of the cells of each cabinet according to the charge and discharge capacity of the cells of each cabinet, and calculate the maximum value of all the states of charge and the minimum of all states of charge. The difference in value;
如果所述差值大于预设差值校准阈值且每个机柜的电芯的充放电容量都大于预设充放电容量校准阈值，则获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，根据每个机柜的电芯的充放电容量、电芯充放电系数对每个机柜的电芯的荷电状态进行校准得到校准后荷电状态；If the difference is greater than the preset difference calibration threshold and the charge and discharge capacity of each cell of the cabinet is greater than the preset charge and discharge capacity calibration threshold, the charge and discharge capacity of each battery cell is obtained, according to each cabinet The charge and discharge capacity of the battery cell calculates the corresponding charge and discharge coefficient of the battery cells of each cabinet, and the state of charge of each battery cell according to the charge and discharge capacity of each battery cell and the charge and discharge coefficient of the battery core. Calibrate to obtain the state of charge after calibration;
如果所述差值小于预设差值校准阈值或任一机柜的电芯的充放电容量小于预设充放电容量校准阈值，则结束。If the difference is less than the preset difference calibration threshold or the charge/discharge capacity of the battery of any cabinet is less than the preset charge and discharge capacity calibration threshold, then the process ends.
作为本发明储能系统的荷电状态校准方法的一种改进，还包括：As an improvement of the state of charge calibration method of the energy storage system of the present invention, the method further includes:
系统荷电状态信息计算步骤，包括：获取每个机柜的电芯温度、电芯电压，根据每个机柜的电芯的校准后荷电状态、电芯温度、电芯电压，计算得到储能系统的荷电状态。The calculation process of the system charging state information includes: obtaining the cell temperature and the cell voltage of each cabinet, and calculating the energy storage system according to the charged state of the battery of each cabinet, the cell temperature, and the cell voltage. State of charge.
为了实现上述发明目的，本发明提供一种储能系统的荷电状态校准装置，所述储能系统包括多个并联且容置电芯的机柜，包括：In order to achieve the above object, the present invention provides a state-of-charge calibration device for an energy storage system, the energy storage system comprising a plurality of cabinets connected in parallel and accommodating a battery cell, including:
机柜校准模块，用于：获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，根据每个机柜的电芯的充放电容量、电芯充放电系数对每个机柜的电芯的荷电状态进行校准得到校准后荷电状态； The cabinet calibration module is configured to: obtain the charge and discharge capacity of the cells of each cabinet, and calculate a corresponding charge and discharge coefficient of the cells of each cabinet according to the charge and discharge capacity of the cells of each cabinet, according to each cabinet The charge and discharge capacity of the battery core and the charge and discharge coefficient of the battery are calibrated to the state of charge of the cells of each cabinet to obtain a state of charge after calibration;
信息发送模块，用于：将每个机柜的电芯的校准后荷电状态发送至充放电控制装置，所述充放电控制装置根据每个机柜的电芯的校准后荷电状态对每个所述机柜的电芯进行充放电控制。An information sending module is configured to: send a calibrated state of charge of the cells of each cabinet to a charge and discharge control device, wherein the charge and discharge control device is configured according to a state of charge of each cell of the cabinet after calibration The battery cells of the cabinet are charged and discharged.
作为本发明储能系统的荷电状态校准装置的一种改进，所述电芯充放电系数包括电芯充电系数、电芯放电系数，所述根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，包括：As an improvement of the state-of-charge calibration device of the energy storage system of the present invention, the cell charge and discharge coefficient includes a cell charge coefficient and a cell discharge coefficient, and the charge and discharge capacity is calculated according to the cell of each cabinet. The corresponding cell charge and discharge coefficients of the cells of the cabinet, including:
选择一个机柜作为基准机柜，将基准机柜以外的机柜作为待校准机柜，对于每个待校准机柜，执行如下操作：Select one cabinet as the reference cabinet and the cabinet other than the reference cabinet as the cabinet to be calibrated. For each cabinet to be calibrated, do as follows:
对待校准机柜用于进行校准的充电容量和放电容量进行清零；The charging capacity and discharge capacity used for calibration in the calibration cabinet are cleared;
当待校准机柜用于进行校准的充电容量和放电容量都大于预设校准容量阈值时；When the charging capacity and the discharging capacity of the cabinet to be calibrated for calibration are greater than a preset calibration capacity threshold;
获取该时刻待校准机柜用于进行校准的充电容量作为校准充电容量、该时刻待校准机柜用于进行校准的放电容量作为校准放电容量，获取该时刻基准机柜用于进行校准的充电容量作为基准充电容量、该时刻基准机柜用于进行校准的放电容量作为基准放电容量；Obtaining the charging capacity for calibration in the cabinet to be calibrated at this time as the calibration charging capacity, and the discharging capacity for calibration in the cabinet to be calibrated at that time is used as the calibration discharge capacity, and the charging capacity used for calibration in the reference cabinet at this time is obtained as the reference charging. Capacity, the discharge capacity used by the reference cabinet for calibration at this time as the reference discharge capacity;
待校准机柜的电芯充电系数＝预设常量×基准充电容量/校准充电容量；Cell charging coefficient of the cabinet to be calibrated = preset constant × reference charging capacity / calibration charging capacity;
待校准机柜的电芯放电系数＝预设常量×基准放电容量/校准放电容量。Cell discharge coefficient of the cabinet to be calibrated = preset constant × reference discharge capacity / calibrated discharge capacity.
作为本发明储能系统的荷电状态校准装置的一种改进，还包括：As an improvement of the state of charge calibration device of the energy storage system of the present invention, the method further includes:
电压检测模块，用于：当高压上电的机柜的数量大于或等于低压在线的机柜的数量时，执行所述机柜校准模块，否则结束。The voltage detecting module is configured to: when the number of cabinets that are powered on by the high voltage is greater than or equal to the number of cabinets in the low voltage line, execute the cabinet calibration module, otherwise, the module ends.
作为本发明储能系统的荷电状态校准装置的一种改进，所述机柜校准模块，具体包括：As an improvement of the state-of-charge calibration device of the energy storage system of the present invention, the cabinet calibration module specifically includes:
获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯的荷电状态，计算所有荷电状态的最大值与所有荷电状态的最小值的差值； Obtain the charge and discharge capacity of the cells of each cabinet, calculate the state of charge of the cells of each cabinet according to the charge and discharge capacity of the cells of each cabinet, and calculate the maximum value of all the states of charge and the minimum of all states of charge. The difference in value;
如果所述差值大于预设差值校准阈值且每个机柜的电芯的充放电容量都大于预设充放电容量校准阈值，则获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，根据每个机柜的电芯的充放电容量、电芯充放电系数对每个机柜的电芯的荷电状态进行校准得到校准后荷电状态；If the difference is greater than the preset difference calibration threshold and the charge and discharge capacity of each cell of the cabinet is greater than the preset charge and discharge capacity calibration threshold, the charge and discharge capacity of each battery cell is obtained, according to each cabinet The charge and discharge capacity of the battery cell calculates the corresponding charge and discharge coefficient of the battery cells of each cabinet, and the state of charge of each battery cell according to the charge and discharge capacity of each battery cell and the charge and discharge coefficient of the battery core. Calibrate to obtain the state of charge after calibration;
如果所述差值小于预设差值校准阈值或任一机柜的电芯的充放电容量小于预设充放电容量校准阈值，则结束。If the difference is less than the preset difference calibration threshold or the charge/discharge capacity of the battery of any cabinet is less than the preset charge and discharge capacity calibration threshold, then the process ends.
作为本发明储能系统的荷电状态校准装置的一种改进，还包括：As an improvement of the state of charge calibration device of the energy storage system of the present invention, the method further includes:
系统荷电状态信息计算模块，用于：获取每个机柜的电芯温度、电芯电压，根据每个机柜的电芯的校准后荷电状态、电芯温度、电芯电压，计算得到储能系统的荷电状态。The system charging state information calculation module is configured to: obtain the cell temperature and the cell voltage of each cabinet, and calculate the energy storage according to the charged state of the battery of each cabinet, the cell temperature, and the cell voltage. The state of charge of the system.
与现有技术相比，本发明储能系统的荷电状态校准方法、装置具有以下效果：Compared with the prior art, the charging state calibration method and device of the energy storage system of the present invention have the following effects:
本发明在系统进行SOC计算的过程中增加了电芯充放电系数Kx进行校准，根据系统的历史充放电状态来计算出每个机柜的电芯充放电系数Kx，再由充放电电芯充放电系数Kx来校准系统的SOC值。在系统计算SOC的过程中增加充放电系数校准，可以明显改善系统并联机柜间的SOC一致性，并且在整个充放电的过程中都能够保持一致，使得系统SOC能够更加准确的反映电池真实的容量，使得系统能够更加合理的进行能量管理和功率预测。The invention adds the cell charge and discharge coefficient Kx to calibrate in the process of system SOC calculation, calculates the cell charge and discharge coefficient Kx of each cabinet according to the historical charge and discharge state of the system, and then charges and discharges the charge and discharge cells. The coefficient Kx is used to calibrate the SOC value of the system. Increasing the charge-discharge coefficient calibration during the system calculation of SOC can significantly improve the SOC consistency between the parallel cabinets of the system, and can be consistent throughout the charging and discharging process, so that the system SOC can more accurately reflect the true capacity of the battery. This enables the system to perform energy management and power prediction more reasonably.
附图说明DRAWINGS
下面结合附图和具体实施方式，对本发明自动导引运输车的电池模组管理方法、装置及其有益效果进行详细说明。The battery module management method and device of the automatic guided transport vehicle of the present invention and the beneficial effects thereof will be described in detail below with reference to the accompanying drawings and specific embodiments.
图1为本发明一种储能系统的荷电状态校准方法的工作流程图。1 is a flow chart showing the operation of a method for calibrating a state of charge of an energy storage system according to the present invention.
图2为本发明一种储能系统的荷电状态校准方法最佳实施例的工作流程图。2 is a flow chart showing the operation of a preferred embodiment of a state of charge calibration method for an energy storage system of the present invention.
图3为本发明一种储能系统的荷电状态校准装置的装置模块图。 3 is a block diagram of a device of a state of charge calibration device of an energy storage system according to the present invention.
具体实施方式detailed description
为了使本发明的发明目的、技术方案及其有益技术效果更加清晰，以下结合附图和具体实施方式，对本发明进行进一步详细说明。应当理解的是，本说明书中描述的具体实施方式仅仅是为了解释本发明，并非为了限定本发明。The present invention will be further described in detail below in conjunction with the drawings and specific embodiments. The specific embodiments described in the specification are to be construed as illustrative only and not limiting.
请参阅图1，本发明一种储能系统的荷电状态校准方法的工作流程图，所述储能系统包括多个并联且容置电芯的机柜，包括：Referring to FIG. 1 , a working flow chart of a method for calibrating a state of charge of an energy storage system according to the present invention includes a plurality of cabinets connected in parallel and accommodating cells, including:
步骤S101，包括：获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，根据每个机柜的电芯的充放电容量、电芯充放电系数对每个机柜的电芯的荷电状态进行校准得到校准后荷电状态；Step S101, comprising: obtaining a charge and discharge capacity of a battery cell of each cabinet, and calculating a corresponding charge and discharge coefficient of the battery core of each cabinet according to a charge and discharge capacity of the battery core of each cabinet, according to the battery core of each cabinet The charge and discharge capacity and the charge and discharge coefficient of the battery are calibrated to the state of charge of the cells of each cabinet to obtain a state of charge after calibration;
步骤S102，包括：将每个机柜的电芯的校准后荷电状态发送至充放电控制装置，所述充放电控制装置根据每个机柜的电芯的校准后荷电状态对每个所述机柜的电芯进行充放电控制。Step S102, comprising: transmitting a calibrated state of charge of the cells of each cabinet to a charge and discharge control device, wherein the charge and discharge control device is configured according to a state of charge of each cell of the cabinet to each of the cabinets The battery is charged and discharged.
每个机柜中均容置电芯，步骤S101获取机柜中电芯的充放电容量，然后计算相应的电芯充放电系数，以对SOC进行校准。然后步骤S102将校准后的SOC发送至充放电控制装置，则充放电控制装置能够根据校准后的SOC进行充放电控制，使得整个储能系统所有机柜的电量保持均衡。Each of the cabinets houses a battery core, and in step S101, the charge and discharge capacity of the battery cells in the cabinet is obtained, and then the corresponding battery charge and discharge coefficients are calculated to calibrate the SOC. Then, in step S102, the calibrated SOC is sent to the charge and discharge control device, and the charge and discharge control device can perform charge and discharge control according to the calibrated SOC, so that the power of all the cabinets of the entire energy storage system is balanced.
本发明在系统进行SOC计算的过程中增加了电芯充放电系数Kx进行校准，根据系统的历史充放电状态来计算出每个机柜的电芯充放电系数Kx，再由充放电电芯充放电系数Kx来校准系统的SOC值。在系统计算SOC的过程中增加充放电系数校准，可以明显改善系统并联机柜间的SOC一致性，并且在整个充放电的过程中都能够保持一致，使得系统SOC能够更加准确的反映电池真实的容量，使得系统能够更加合理的进行能量管理和功率预测。The invention adds the cell charge and discharge coefficient Kx to calibrate in the process of system SOC calculation, calculates the cell charge and discharge coefficient Kx of each cabinet according to the historical charge and discharge state of the system, and then charges and discharges the charge and discharge cells. The coefficient Kx is used to calibrate the SOC value of the system. Increasing the charge-discharge coefficient calibration during the system calculation of SOC can significantly improve the SOC consistency between the parallel cabinets of the system, and can be consistent throughout the charging and discharging process, so that the system SOC can more accurately reflect the true capacity of the battery. This enables the system to perform energy management and power prediction more reasonably.
在本发明储能系统的荷电状态校准方法的一个实施例中，所述电芯充放电系数包括电芯充电系数、电芯放电系数，所述根据每个机柜的电芯的充放电容 量计算每个机柜的电芯相应的电芯充放电系数，包括：In an embodiment of the charging state calibration method of the energy storage system of the present invention, the cell charge and discharge coefficient comprises a cell charging coefficient, a cell discharge coefficient, and the charging and discharging capacitance according to the cell of each cabinet. Calculate the corresponding cell charge and discharge coefficient of each cell's battery, including:
选择一个机柜作为基准机柜，将基准机柜以外的机柜作为待校准机柜，对于每个待校准机柜，执行如下操作：Select one cabinet as the reference cabinet and the cabinet other than the reference cabinet as the cabinet to be calibrated. For each cabinet to be calibrated, do as follows:
对待校准机柜用于进行校准的充电容量和放电容量进行清零；The charging capacity and discharge capacity used for calibration in the calibration cabinet are cleared;
当待校准机柜用于进行校准的充电容量和放电容量都大于预设校准容量阈值时；When the charging capacity and the discharging capacity of the cabinet to be calibrated for calibration are greater than a preset calibration capacity threshold;
获取该时刻待校准机柜用于进行校准的充电容量作为校准充电容量、该时刻待校准机柜用于进行校准的放电容量作为校准放电容量，获取该时刻基准机柜用于进行校准的充电容量作为基准充电容量、该时刻基准机柜用于进行校准的放电容量作为基准放电容量；Obtaining the charging capacity for calibration in the cabinet to be calibrated at this time as the calibration charging capacity, and the discharging capacity for calibration in the cabinet to be calibrated at that time is used as the calibration discharge capacity, and the charging capacity used for calibration in the reference cabinet at this time is obtained as the reference charging. Capacity, the discharge capacity used by the reference cabinet for calibration at this time as the reference discharge capacity;
待校准机柜的电芯充电系数＝预设常量×基准充电容量/校准充电容量；Cell charging coefficient of the cabinet to be calibrated = preset constant × reference charging capacity / calibration charging capacity;
待校准机柜的电芯放电系数＝预设常量×基准放电容量/校准放电容量。Cell discharge coefficient of the cabinet to be calibrated = preset constant × reference discharge capacity / calibrated discharge capacity.
具体来说，充放电电芯充放电系数Kx包括机柜充电校准系数Kc、机柜放电校准系数Kd。Specifically, the charging and discharging cell charging and discharging coefficient Kx includes a cabinet charging calibration coefficient Kc and a cabinet discharge calibration coefficient Kd.
由主控柜发送清零容量命令给进行校准的从控柜以清零机柜计算Kx的容量；当系统进行充放电的时候，从控柜不断的累计计算Kx的容量，主控柜发送读取容量命令给从控柜以读取机柜用于计算Kx的容量；当机柜累计的计算Kx的充放电容量都大于0.05C，n#机柜充电校准系数Kc＝1#机柜的充电容量/n#机柜的充容量*1024，n#机柜放电校准系数Kd＝1#机柜的放电容量/n#机柜的放电容量*1024。其中，n#机柜为待校准机柜，1#机柜为基准机柜。The clearing capacity command is sent by the main control cabinet to the slave control cabinet for calibration to calculate the capacity of the Kx in the cabinet; when the system is charged and discharged, the capacity of the Kx is continuously calculated from the control cabinet, and the main control cabinet sends and reads. The capacity command is given to the slave control cabinet to read the cabinet for calculating the capacity of Kx; when the cumulative calculation of the Kx charge and discharge capacity of the cabinet is greater than 0.05C, the charging calibration coefficient of the n# cabinet is Kc=1# the charging capacity of the cabinet/n# cabinet Charging capacity * 1024, n # cabinet discharge calibration coefficient Kd = 1 # cabinet discharge capacity / n # cabinet discharge capacity * 1024. The n# cabinet is the cabinet to be calibrated, and the 1# cabinet is the reference cabinet.
在本发明储能系统的荷电状态校准方法的一个实施例中，还包括：In an embodiment of the method for calibrating the state of charge of the energy storage system of the present invention, the method further includes:
电压检测步骤，包括：当高压上电的机柜的数量大于或等于低压在线的机柜的数量时，执行所述步骤S101，否则结束。The voltage detecting step includes: when the number of cabinets that are powered on by the high voltage is greater than or equal to the number of cabinets in the low voltage line, the step S101 is performed; otherwise, the process ends.
当低压在线的机柜闭合高压接触器后则成为高压上电的机柜。When the low-voltage online cabinet closes the high-voltage contactor, it becomes a high-voltage power-on cabinet.
本实施例通过比较高压上电的机柜的数量与低压在线的机柜的数量，从而 保证储能系统的所有并联机柜电芯状态的一致性。In this embodiment, the number of cabinets with high voltage power-on and the number of cabinets with low-voltage power are compared. Ensure the consistency of the state of the cells in all parallel cabinets of the energy storage system.
在本发明储能系统的荷电状态校准方法的一个实施例中，所述步骤S101，具体包括：In an embodiment of the charging state calibration method of the energy storage system of the present invention, the step S101 includes:
获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯的荷电状态，计算所有荷电状态的最大值与所有荷电状态的最小值的差值；Obtain the charge and discharge capacity of the cells of each cabinet, calculate the state of charge of the cells of each cabinet according to the charge and discharge capacity of the cells of each cabinet, and calculate the maximum value of all the states of charge and the minimum of all states of charge. The difference in value;
如果所述差值大于预设差值校准阈值且每个机柜的电芯的充放电容量都大于预设充放电容量校准阈值，则获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，根据每个机柜的电芯的充放电容量、电芯充放电系数对每个机柜的电芯的荷电状态进行校准得到校准后荷电状态；If the difference is greater than the preset difference calibration threshold and the charge and discharge capacity of each cell of the cabinet is greater than the preset charge and discharge capacity calibration threshold, the charge and discharge capacity of each battery cell is obtained, according to each cabinet The charge and discharge capacity of the battery cell calculates the corresponding charge and discharge coefficient of the battery cells of each cabinet, and the state of charge of each battery cell according to the charge and discharge capacity of each battery cell and the charge and discharge coefficient of the battery core. Calibrate to obtain the state of charge after calibration;
如果所述差值小于预设差值校准阈值或任一机柜的电芯的充放电容量小于预设充放电容量校准阈值，则结束。If the difference is less than the preset difference calibration threshold or the charge/discharge capacity of the battery of any cabinet is less than the preset charge and discharge capacity calibration threshold, then the process ends.
具体来说，差值校准阈值优选为3％，充放电容量校准阈值优选为0.05库仑(C)。Specifically, the difference calibration threshold is preferably 3%, and the charge and discharge capacity calibration threshold is preferably 0.05 coulomb (C).
本实施例通过对最大值与最小值之间的差值、以及单个机柜的充放电容量进行判断，减少不必要的校准。This embodiment reduces unnecessary calibration by judging the difference between the maximum value and the minimum value and the charge and discharge capacity of a single cabinet.
在本发明储能系统的荷电状态校准方法的一个实施例中，还包括：In an embodiment of the method for calibrating the state of charge of the energy storage system of the present invention, the method further includes:
系统荷电状态信息计算步骤，包括：获取每个机柜的电芯温度、电芯电压，根据每个机柜的电芯的校准后荷电状态、电芯温度、电芯电压，计算得到储能系统的荷电状态。The calculation process of the system charging state information includes: obtaining the cell temperature and the cell voltage of each cabinet, and calculating the energy storage system according to the charged state of the battery of each cabinet, the cell temperature, and the cell voltage. State of charge.
具体来说，由各机柜的SOC值、电芯温度和电芯电压，通过查表来计算得到此时的系统SOC值，对应的查询表格由对应电芯经过大量实验得到。Specifically, the SOC value, the cell temperature, and the cell voltage of each cabinet are calculated by looking up the system SOC value at this time, and the corresponding query table is obtained by a large number of experiments from the corresponding cell.
本实施例计算储能系统总的荷电状态，以便对系统进行能量管理和功率预测。 This embodiment calculates the total state of charge of the energy storage system for energy management and power prediction of the system.
请参阅图2，本发明一种储能系统的荷电状态校准方法最佳实施例的工作流程图，包括：Referring to FIG. 2, a working flow chart of a preferred embodiment of a method for calibrating a state of charge of an energy storage system according to the present invention includes:
步骤S201，当高压上电的机柜的数量大于或等于低压在线机柜数量时，执行步骤S202执行机柜SOC偏差校准，否则结束。In step S201, when the number of high-voltage power-on cabinets is greater than or equal to the number of low-voltage online cabinets, step S202 is performed to perform cabinet SOC deviation calibration, otherwise, the process ends.
步骤S202，进入机柜SOC偏差校准后，检测所有机柜之间的最大和最小SOC的差值，当这个差值大于3％的时候，进入步骤S203执行Kx校准，否则结束。Step S202, after entering the cabinet SOC deviation calibration, detecting the difference between the maximum and minimum SOC between all the cabinets. When the difference is greater than 3%, the process proceeds to step S203 to perform Kx calibration, otherwise, the process ends.
步骤S203，读取每个并联机柜的充放电容量，如果每个机柜的充放电容量都大于0.05C满足计算校准系数Kx的条件，由读取的充放电容量来计算得到校准系数Kx。校准系数Kx分为充电系数Kc和放电系数Kd。In step S203, the charge and discharge capacity of each parallel cabinet is read. If the charge and discharge capacity of each cabinet is greater than 0.05C, the condition for calculating the calibration coefficient Kx is satisfied, and the calibration coefficient Kx is calculated from the read charge and discharge capacity. The calibration coefficient Kx is divided into a charging coefficient Kc and a discharging coefficient Kd.
步骤S204，由各机柜的SOC值、电芯温度和电芯电压通过查表来计算得到此时的储能系统的总的SOC值，对应的查询表格有对应电芯经过大量实验得到。In step S204, the total SOC value of the energy storage system at this time is calculated by looking up the SOC value, the cell temperature and the cell voltage of each cabinet, and the corresponding query table has corresponding batteries obtained through a large number of experiments.
步骤S205，将计算得到的校准SOC值提供给储能系统的控制装置运行使用。Step S205, the calculated calibration SOC value is provided to the control device of the energy storage system for operation and use.
请参阅图3，本发明一种储能系统的荷电状态校准装置的装置模块图，所述储能系统包括多个并联且容置电芯的机柜，包括：Referring to FIG. 3, a device module diagram of a state-of-charge calibration device for an energy storage system according to the present invention includes a plurality of cabinets connected in parallel and accommodating cells, including:
机柜校准模块301，用于：获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，根据每个机柜的电芯的充放电容量、电芯充放电系数对每个机柜的电芯的荷电状态进行校准得到校准后荷电状态；The cabinet calibration module 301 is configured to: obtain a charge and discharge capacity of the cells of each cabinet, and calculate a corresponding charge and discharge coefficient of the cells of each cabinet according to the charge and discharge capacity of the cells of each cabinet, according to each cabinet The charge and discharge capacity of the battery cell and the charge and discharge coefficient of the battery are calibrated to the state of charge of the cells of each cabinet to obtain a state of charge after calibration;
信息发送模块302，用于：将每个机柜的电芯的校准后荷电状态发送至充放电控制装置，所述充放电控制装置根据每个机柜的电芯的校准后荷电状态对每个所述机柜的电芯进行充放电控制。The information sending module 302 is configured to: send the calibrated state of charge of the cells of each cabinet to the charge and discharge control device, wherein the charge and discharge control device is configured according to the state of charge of each cell of the cabinet after calibration The battery cells of the cabinet are charged and discharged.
在本发明储能系统的荷电状态校准装置的一个实施例中，所述电芯充放电系数包括电芯充电系数、电芯放电系数，所述根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，包括： In an embodiment of the state-of-charge calibration device of the energy storage system of the present invention, the cell charge and discharge coefficient includes a cell charge coefficient and a cell discharge coefficient, and the charge and discharge capacity is calculated according to the cells of each cabinet. The corresponding cell charge and discharge coefficient of each cell's battery, including:
选择一个机柜作为基准机柜，将基准机柜以外的机柜作为待校准机柜，对于每个待校准机柜，执行如下操作：Select one cabinet as the reference cabinet and the cabinet other than the reference cabinet as the cabinet to be calibrated. For each cabinet to be calibrated, do as follows:
对待校准机柜用于进行校准的充电容量和放电容量进行清零；The charging capacity and discharge capacity used for calibration in the calibration cabinet are cleared;
当待校准机柜用于进行校准的充电容量和放电容量都大于预设校准容量阈值时；When the charging capacity and the discharging capacity of the cabinet to be calibrated for calibration are greater than a preset calibration capacity threshold;
获取该时刻待校准机柜用于进行校准的充电容量作为校准充电容量、该时刻待校准机柜用于进行校准的放电容量作为校准放电容量，获取该时刻基准机柜用于进行校准的充电容量作为基准充电容量、该时刻基准机柜用于进行校准的放电容量作为基准放电容量；Obtaining the charging capacity for calibration in the cabinet to be calibrated at this time as the calibration charging capacity, and the discharging capacity for calibration in the cabinet to be calibrated at that time is used as the calibration discharge capacity, and the charging capacity used for calibration in the reference cabinet at this time is obtained as the reference charging. Capacity, the discharge capacity used by the reference cabinet for calibration at this time as the reference discharge capacity;
待校准机柜的电芯充电系数＝预设常量×基准充电容量/校准充电容量；Cell charging coefficient of the cabinet to be calibrated = preset constant × reference charging capacity / calibration charging capacity;
待校准机柜的电芯放电系数＝预设常量×基准放电容量/校准放电容量。Cell discharge coefficient of the cabinet to be calibrated = preset constant × reference discharge capacity / calibrated discharge capacity.
在本发明储能系统的荷电状态校准装置的一个实施例中，还包括：In an embodiment of the state of charge calibration device of the energy storage system of the present invention, the method further includes:
电压检测模块，用于：当高压上电的机柜的数量大于或等于低压在线的机柜的数量时，执行所述机柜校准模块，否则结束。The voltage detecting module is configured to: when the number of cabinets that are powered on by the high voltage is greater than or equal to the number of cabinets in the low voltage line, execute the cabinet calibration module, otherwise, the module ends.
在本发明储能系统的荷电状态校准装置的一个实施例中，所述机柜校准模块，具体包括：In an embodiment of the charging state calibration device of the energy storage system of the present invention, the cabinet calibration module specifically includes:
获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯的荷电状态，计算所有荷电状态的最大值与所有荷电状态的最小值的差值；Obtain the charge and discharge capacity of the cells of each cabinet, calculate the state of charge of the cells of each cabinet according to the charge and discharge capacity of the cells of each cabinet, and calculate the maximum value of all the states of charge and the minimum of all states of charge. The difference in value;
如果所述差值大于预设差值校准阈值且每个机柜的电芯的充放电容量都大于预设充放电容量校准阈值，则获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，根据每个机柜的电芯的充放电容量、电芯充放电系数对每个机柜的电芯的荷电状态进行校准得到校准后荷电状态；If the difference is greater than the preset difference calibration threshold and the charge and discharge capacity of each cell of the cabinet is greater than the preset charge and discharge capacity calibration threshold, the charge and discharge capacity of each battery cell is obtained, according to each cabinet The charge and discharge capacity of the battery cell calculates the corresponding charge and discharge coefficient of the battery cells of each cabinet, and the state of charge of each battery cell according to the charge and discharge capacity of each battery cell and the charge and discharge coefficient of the battery core. Calibrate to obtain the state of charge after calibration;
如果所述差值小于预设差值校准阈值或任一机柜的电芯的充放电容量小于 预设充放电容量校准阈值，则结束。If the difference is less than the preset difference calibration threshold or the charge and discharge capacity of the battery of any cabinet is less than The preset charge and discharge capacity calibration threshold ends.
在本发明储能系统的荷电状态校准装置的一个实施例中，还包括：In an embodiment of the state of charge calibration device of the energy storage system of the present invention, the method further includes:
系统荷电状态信息计算模块，用于：获取每个机柜的电芯温度、电芯电压，根据每个机柜的电芯的校准后荷电状态、电芯温度、电芯电压，计算得到储能系统的荷电状态。The system charging state information calculation module is configured to: obtain the cell temperature and the cell voltage of each cabinet, and calculate the energy storage according to the charged state of the battery of each cabinet, the cell temperature, and the cell voltage. The state of charge of the system.
根据上述说明书的揭示和教导，本发明所属领域的技术人员还可以对上述实施方式进行适当的变更和修改。因此，本发明并不局限于上面揭示和描述的具体实施方式，对本发明的一些修改和变更也应当落入本发明的权利要求的保护范围内。此外，尽管本说明书中使用了一些特定的术语，但这些术语只是为了方便说明，并不对本发明构成任何限制。 The above embodiments may be modified and modified as appropriate by those skilled in the art in light of the above disclosure. Therefore, the invention is not limited to the specific embodiments disclosed and described herein, and the modifications and variations of the invention are intended to fall within the scope of the appended claims. In addition, although specific terms are used in the specification, these terms are merely for convenience of description and do not limit the invention.

Claims (10)

  1. 一种储能系统的荷电状态校准方法，所述储能系统包括多个并联且容置电芯的机柜，其特征在于，包括：A method for calibrating a state of charge of an energy storage system, the energy storage system comprising a plurality of cabinets connected in parallel and accommodating a battery core, comprising:
    机柜校准步骤，包括：获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，根据每个机柜的电芯的充放电容量、电芯充放电系数对每个机柜的电芯的荷电状态进行校准得到校准后荷电状态；The cabinet calibration step includes: obtaining the charge and discharge capacity of the cells of each cabinet, and calculating the charge and discharge coefficient of the corresponding cells of each cabinet according to the charge and discharge capacity of the cells of each cabinet, according to the power of each cabinet The charge and discharge capacity of the core and the charge and discharge coefficient of the battery are calibrated to the state of charge of the cells of each cabinet to obtain a state of charge after calibration;
    信息发送步骤，包括：将每个机柜的电芯的校准后荷电状态发送至充放电控制装置，所述充放电控制装置根据每个机柜的电芯的校准后荷电状态对每个所述机柜的电芯进行充放电控制。The information transmitting step includes: transmitting a calibrated state of charge of the cells of each cabinet to a charge and discharge control device, wherein the charge and discharge control device is configured according to each of the calibrated state of charge of the cells of each cabinet The battery core of the cabinet is charged and discharged.
  2. 根据权利要求1所述的储能系统的荷电状态校准方法，其特征在于，所述电芯充放电系数包括电芯充电系数、电芯放电系数，所述根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，包括：The method for calibrating a state of charge of an energy storage system according to claim 1, wherein the charge and discharge coefficient of the cell comprises a charge coefficient of the cell, a discharge coefficient of the cell, and the charge according to the cell of each cabinet The discharge capacity calculates the corresponding cell charge and discharge coefficient of each cell's battery, including:
    选择一个机柜作为基准机柜，将基准机柜以外的机柜作为待校准机柜，对于每个待校准机柜，执行如下操作：Select one cabinet as the reference cabinet and the cabinet other than the reference cabinet as the cabinet to be calibrated. For each cabinet to be calibrated, do as follows:
    对待校准机柜用于进行校准的充电容量和放电容量进行清零；The charging capacity and discharge capacity used for calibration in the calibration cabinet are cleared;
    当待校准机柜用于进行校准的充电容量和放电容量都大于预设校准容量阈值时；When the charging capacity and the discharging capacity of the cabinet to be calibrated for calibration are greater than a preset calibration capacity threshold;
    获取该时刻待校准机柜用于进行校准的充电容量作为校准充电容量、该时刻待校准机柜用于进行校准的放电容量作为校准放电容量，获取该时刻基准机柜用于进行校准的充电容量作为基准充电容量、该时刻基准机柜用于进行校准的放电容量作为基准放电容量；Obtaining the charging capacity for calibration in the cabinet to be calibrated at this time as the calibration charging capacity, and the discharging capacity for calibration in the cabinet to be calibrated at that time is used as the calibration discharge capacity, and the charging capacity used for calibration in the reference cabinet at this time is obtained as the reference charging. Capacity, the discharge capacity used by the reference cabinet for calibration at this time as the reference discharge capacity;
    待校准机柜的电芯充电系数＝预设常量×基准充电容量/校准充电容量；Cell charging coefficient of the cabinet to be calibrated = preset constant × reference charging capacity / calibration charging capacity;
    待校准机柜的电芯放电系数＝预设常量×基准放电容量/校准放电容量。Cell discharge coefficient of the cabinet to be calibrated = preset constant × reference discharge capacity / calibrated discharge capacity.
  3. 根据权利要求1所述的储能系统的荷电状态校准方法，其特征在于，还包括： The method for calibrating a state of charge of an energy storage system according to claim 1, further comprising:
    电压检测步骤，包括：当高压上电的机柜的数量大于或等于低压在线的机柜的数量时，执行所述机柜校准步骤，否则结束。The voltage detecting step includes: performing the cabinet calibration step when the number of cabinets with high voltage power is greater than or equal to the number of cabinets at low voltage, otherwise ending.
  4. 根据权利要求1所述的储能系统的荷电状态校准方法，其特征在于，所述机柜校准步骤，具体包括：The charging state calibration method of the energy storage system according to claim 1, wherein the cabinet calibration step comprises:
    获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯的荷电状态，计算所有荷电状态的最大值与所有荷电状态的最小值的差值；Obtain the charge and discharge capacity of the cells of each cabinet, calculate the state of charge of the cells of each cabinet according to the charge and discharge capacity of the cells of each cabinet, and calculate the maximum value of all the states of charge and the minimum of all states of charge. The difference in value;
    如果所述差值大于预设差值校准阈值且每个机柜的电芯的充放电容量都大于预设充放电容量校准阈值，则获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，根据每个机柜的电芯的充放电容量、电芯充放电系数对每个机柜的电芯的荷电状态进行校准得到校准后荷电状态；If the difference is greater than the preset difference calibration threshold and the charge and discharge capacity of each cell of the cabinet is greater than the preset charge and discharge capacity calibration threshold, the charge and discharge capacity of each battery cell is obtained, according to each cabinet The charge and discharge capacity of the battery cell calculates the corresponding charge and discharge coefficient of the battery cells of each cabinet, and the state of charge of each battery cell according to the charge and discharge capacity of each battery cell and the charge and discharge coefficient of the battery core. Calibrate to obtain the state of charge after calibration;
    如果所述差值小于预设差值校准阈值或任一机柜的电芯的充放电容量小于预设充放电容量校准阈值，则结束。If the difference is less than the preset difference calibration threshold or the charge/discharge capacity of the battery of any cabinet is less than the preset charge and discharge capacity calibration threshold, then the process ends.
  5. 根据权利要求1所述的储能系统的荷电状态校准方法，其特征在于，还包括：The method for calibrating a state of charge of an energy storage system according to claim 1, further comprising:
    系统荷电状态信息计算步骤，包括：获取每个机柜的电芯温度、电芯电压，根据每个机柜的电芯的校准后荷电状态、电芯温度、电芯电压，计算得到储能系统的荷电状态。The calculation process of the system charging state information includes: obtaining the cell temperature and the cell voltage of each cabinet, and calculating the energy storage system according to the charged state of the battery of each cabinet, the cell temperature, and the cell voltage. State of charge.
  6. 一种储能系统的荷电状态校准装置，所述储能系统包括多个并联且容置电芯的机柜，其特征在于，包括：A state-of-charge calibration device for an energy storage system, the energy storage system comprising a plurality of cabinets connected in parallel and accommodating a battery core, comprising:
    机柜校准模块，用于：获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，根据每个机柜的电芯的充放电容量、电芯充放电系数对每个机柜的电芯的荷电状态进行校准得到校准后荷电状态； The cabinet calibration module is configured to: obtain the charge and discharge capacity of the cells of each cabinet, and calculate a corresponding charge and discharge coefficient of the cells of each cabinet according to the charge and discharge capacity of the cells of each cabinet, according to each cabinet The charge and discharge capacity of the battery core and the charge and discharge coefficient of the battery are calibrated to the state of charge of the cells of each cabinet to obtain a state of charge after calibration;
    信息发送模块，用于：将每个机柜的电芯的校准后荷电状态发送至充放电控制装置，所述充放电控制装置根据每个机柜的电芯的校准后荷电状态对每个所述机柜的电芯进行充放电控制。An information sending module is configured to: send a calibrated state of charge of the cells of each cabinet to a charge and discharge control device, wherein the charge and discharge control device is configured according to a state of charge of each cell of the cabinet after calibration The battery cells of the cabinet are charged and discharged.
  7. 根据权利要求6所述的储能系统的荷电状态校准装置，其特征在于，所述电芯充放电系数包括电芯充电系数、电芯放电系数，所述根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，包括：The state-of-charge calibration device for an energy storage system according to claim 6, wherein the cell charge and discharge coefficient comprises a cell charge coefficient and a cell discharge coefficient, and the charge according to the cell of each cabinet The discharge capacity calculates the corresponding cell charge and discharge coefficient of each cell's battery, including:
    选择一个机柜作为基准机柜，将基准机柜以外的机柜作为待校准机柜，对于每个待校准机柜，执行如下操作：Select one cabinet as the reference cabinet and the cabinet other than the reference cabinet as the cabinet to be calibrated. For each cabinet to be calibrated, do as follows:
    对待校准机柜用于进行校准的充电容量和放电容量进行清零；The charging capacity and discharge capacity used for calibration in the calibration cabinet are cleared;
    当待校准机柜用于进行校准的充电容量和放电容量都大于预设校准容量阈值时；When the charging capacity and the discharging capacity of the cabinet to be calibrated for calibration are greater than a preset calibration capacity threshold;
    获取该时刻待校准机柜用于进行校准的充电容量作为校准充电容量、该时刻待校准机柜用于进行校准的放电容量作为校准放电容量，获取该时刻基准机柜用于进行校准的充电容量作为基准充电容量、该时刻基准机柜用于进行校准的放电容量作为基准放电容量；Obtaining the charging capacity for calibration in the cabinet to be calibrated at this time as the calibration charging capacity, and the discharging capacity for calibration in the cabinet to be calibrated at that time is used as the calibration discharge capacity, and the charging capacity used for calibration in the reference cabinet at this time is obtained as the reference charging. Capacity, the discharge capacity used by the reference cabinet for calibration at this time as the reference discharge capacity;
    待校准机柜的电芯充电系数＝预设常量×基准充电容量/校准充电容量；Cell charging coefficient of the cabinet to be calibrated = preset constant × reference charging capacity / calibration charging capacity;
    待校准机柜的电芯放电系数＝预设常量×基准放电容量/校准放电容量。Cell discharge coefficient of the cabinet to be calibrated = preset constant × reference discharge capacity / calibrated discharge capacity.
  8. 根据权利要求6所述的储能系统的荷电状态校准装置，其特征在于，还包括：The state of charge calibration device of the energy storage system according to claim 6, further comprising:
    电压检测模块，用于：当高压上电的机柜的数量大于或等于低压在线的机柜的数量时，执行所述机柜校准模块，否则结束。The voltage detecting module is configured to: when the number of cabinets that are powered on by the high voltage is greater than or equal to the number of cabinets in the low voltage line, execute the cabinet calibration module, otherwise, the module ends.
  9. 根据权利要求6所述的储能系统的荷电状态校准装置，其特征在于，所述机柜校准模块，具体包括：The charging state calibration device of the energy storage system according to claim 6, wherein the cabinet calibration module comprises:
    获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯的荷电状态，计算所有荷电状态的最大值与所有荷电状态的 最小值的差值；Obtain the charge and discharge capacity of the cells of each cabinet, calculate the state of charge of the cells of each cabinet according to the charge and discharge capacity of the cells of each cabinet, and calculate the maximum value of all the states of charge and all states of charge. The difference between the minimum values;
    如果所述差值大于预设差值校准阈值且每个机柜的电芯的充放电容量都大于预设充放电容量校准阈值，则获取每个机柜的电芯的充放电容量，根据每个机柜的电芯的充放电容量计算每个机柜的电芯相应的电芯充放电系数，根据每个机柜的电芯的充放电容量、电芯充放电系数对每个机柜的电芯的荷电状态进行校准得到校准后荷电状态；If the difference is greater than the preset difference calibration threshold and the charge and discharge capacity of each cell of the cabinet is greater than the preset charge and discharge capacity calibration threshold, the charge and discharge capacity of each battery cell is obtained, according to each cabinet The charge and discharge capacity of the battery cell calculates the corresponding charge and discharge coefficient of the battery cells of each cabinet, and the state of charge of each battery cell according to the charge and discharge capacity of each battery cell and the charge and discharge coefficient of the battery core. Calibrate to obtain the state of charge after calibration;
    如果所述差值小于预设差值校准阈值或任一机柜的电芯的充放电容量小于预设充放电容量校准阈值，则结束。If the difference is less than the preset difference calibration threshold or the charge/discharge capacity of the battery of any cabinet is less than the preset charge and discharge capacity calibration threshold, then the process ends.
  10. 根据权利要求6所述的储能系统的荷电状态校准装置，其特征在于，还包括：The state of charge calibration device of the energy storage system according to claim 6, further comprising:
    系统荷电状态信息计算模块，用于：获取每个机柜的电芯温度、电芯电压，根据每个机柜的电芯的校准后荷电状态、电芯温度、电芯电压，计算得到储能系统的荷电状态。 The system charging state information calculation module is configured to: obtain the cell temperature and the cell voltage of each cabinet, and calculate the energy storage according to the charged state of the battery of each cabinet, the cell temperature, and the cell voltage. The state of charge of the system.
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