Remote intelligent state-of-charge system and method for batteries

Abstract

The application discloses a kind of battery remote intelligent capacity checking system and method, system includes charge-discharge capacity checking monitoring module, charge-discharge grid-connected capacity checking device, several battery groups, several battery equalization maintenance units and several MCU control devices;Method includes the following steps: S1, the state detection of battery group is carried out by battery equalization maintenance unit;S2, by charge-discharge capacity checking monitoring module, control charge-discharge grid-connected capacity checking device starts discharge according to discharge parameter;S3, by charge-discharge capacity checking monitoring module, control charge-discharge grid-connected capacity checking device carries out charging process according to charging parameter;S4, when battery group state is abnormal, charge-discharge capacity checking monitoring module controls battery group discharge switch and grid-connected switch are in disconnected state.The application can reduce the hidden trouble caused by manual operation by integrating battery remote charge-discharge management, real-time monitoring and online equalization maintenance and other functions, and improve maintenance efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery capacity testing, and particularly relates to a battery remote intelligent capacity testing system and method. BACKGROUND

[0002] The battery remote intelligent capacity testing system is an electronic control system for monitoring and managing rechargeable battery systems, which can include single or multiple batteries or battery packs. The core function of the battery remote intelligent capacity testing system is to ensure that the battery always operates within a safe operating range and to monitor its key state parameters in real time, including voltage, temperature and current, etc. In addition, the battery remote intelligent capacity testing system also has data calculation and processing capabilities, which can transmit processed data to external devices to realize real-time monitoring, intelligent control, system authentication and battery balancing of the battery system.

[0003] However, the existing battery remote intelligent capacity testing system still has many limitations, such as: strong dependence on manual operation, traditional battery remote intelligent capacity testing systems usually need manual on-site operation for charge and discharge testing, which is low in efficiency and has safety hazards; unable to remotely control, traditional battery remote intelligent capacity testing systems cannot realize remote charge and discharge capacity testing, and have poor operation flexibility; resistance discharge heating, traditional capacity testing usually uses resistance load discharge, and the energy is dissipated in the form of heat, which wastes energy and increases the heat dissipation burden; unable to energy feedback, the discharge energy is not recycled, which does not meet the green energy-saving trend. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide a battery remote intelligent capacity testing system and method, which integrates battery remote charge and discharge management, real-time monitoring, battery performance analysis and online balancing maintenance functions, and uses inverter grid-connected discharge capacity testing, which can reduce the hidden dangers caused by manual operation, improve maintenance efficiency and reduce maintenance cost.

[0005] The following technical solutions are implemented:

[0006] In a first aspect, a remote intelligent battery capacity system is provided, which comprises a charge-discharge capacity monitoring module, a charge-discharge grid-connected capacity device, a plurality of battery packs, a plurality of battery equalization maintenance units and a plurality of MCU control devices. Each battery pack corresponds to a battery equalization maintenance unit and an MCU control device. The charge-discharge capacity monitoring module is connected to the charge-discharge grid-connected capacity device through an RS485 communication protocol, and is used to control the charge-discharge grid-connected capacity device to perform charge-discharge operations, support remote control of the charge-discharge grid-connected capacity device to start and stop the charge-discharge of each battery pack, and real-time view the running state of each battery pack and each single battery. The charge-discharge grid-connected capacity device is built-in with a PCS inverter device, which is connected to each battery pack through a DC bus, and the DC bus is provided with a discharge switch of each battery pack, which is used to control the connection and disconnection of the charge-discharge circuit under the control of the charge-discharge capacity monitoring module. Each battery pack comprises a plurality of single batteries, and a controllable switch is arranged on the connection line between each single battery, and the connection and disconnection of the controllable switch is controlled by the corresponding MCU control device according to the running state of each single battery. When any MCU control device receives the battery state parameters collected by the corresponding battery equalization maintenance unit, if it is detected that there is an abnormal single battery in any battery pack, all the control switches connected to the abnormal single battery are turned off, and the discharge capacity is performed through the remaining single batteries. At the same time, during the process of generating electricity by one or more battery packs as the station's working power supply, if it is found that the generating capacity of the single battery generating electricity is insufficient, the charge-discharge capacity monitoring module calculates the missing battery capacity of each battery pack, calculates the number of single batteries to be added, and then opens other battery packs and connects the number of single batteries to be added. Each battery equalization maintenance unit comprises a voltage acquisition module, a current acquisition module, an internal resistance measurement module, a temperature acquisition module, an equalization charging module and an equalization discharging module. Each MCU control device is connected to the corresponding battery pack, battery equalization maintenance unit and charge-discharge capacity monitoring module through each interface. The MCU control device is responsible for receiving the state parameters of the battery pack and single battery collected by the battery equalization maintenance unit in real time, and is also responsible for receiving the discharge capacity information of the corresponding battery pack calculated by the charge-discharge capacity monitoring module in real time, and calculating the battery condition of the corresponding battery pack according to the received data through a genetic algorithm. The self-adaptive function of the current battery pack battery condition calculated by any MCU control device through the genetic algorithm is: F(x)=A1(t)×W1×Q(x)-A2(t)×W2×T(x)+A3(t)×W3×M(x), x is an array formed by the upper limit set value of the discharge current, the upper limit set value of the discharge voltage and the upper limit set value of the temperature of the current battery pack.A1(t), A2(t) and A3(t) correspond to the iteration number functions of Q(x), T(x) and M(x) respectively, t is the iteration number; W1, W2 and W3 are all weight adjustment coefficients which dynamically change with the iteration number t; Q(x), T(x) and M(x) represent the discharge capacity, temperature and the number of fault-free monomer storage batteries which dynamically change with the array x, and all are normalized before operation to unify the dimensions of the three; W1, W2 and W3 are the preset weight of the discharge capacity, the preset weight of the temperature and the preset inertial weight of the number of fault-free monomer storage batteries respectively; wherein, the evolutionary iteration process of each battery group battery condition calculated by the genetic algorithm is divided into early and late stages, and the corresponding weight is adjusted by using the Sigmoid function, and the iteration number functions of Q(x), T(x) and M(x) in the early and late stages are: , , t0 is the evolutionary iteration midpoint, k is the slope coefficient, and e is the base of natural logarithm; wherein, the weight of A1(t) is increased in the early stage of the evolutionary iteration process to ensure that A1(t)>A2(t)+A3(t), and the weights of A2(t) and A3(t) are increased in the late stage of the evolutionary iteration process to ensure that A1(t)<A2(t)+A3(t), and the optimal solution x is output based on the adaptive function F(x), and the current battery group is controlled to adjust according to the optimal solution by the MCU control device. The system integrates functions such as remote charging and discharging management of the battery, real-time monitoring, battery performance analysis and online balancing maintenance, and adopts the way of inverter grid-connected discharge to reduce the hidden danger caused by manual operation, improve the maintenance efficiency and reduce the maintenance cost.

[0007] Preferably, the charging and discharging grid-connected capacity device is connected with the station power through a DC bus, and a grid-connected switch is arranged on the DC bus, and the grid-connected switch is closed or opened by the control of the charging and discharging capacity monitoring module when any one battery group is charging and discharging. By connecting the grid-connected switch, the battery storage power is delivered to the station power, further avoiding the waste of battery power.

[0008] Preferably, during the charging and discharging process of each battery group, when the voltage or current of the battery group and the voltage, temperature or internal resistance of the monomer battery are detected by the corresponding battery equalization maintenance unit to exceed or be lower than the set threshold value, the charging and discharging capacity monitoring module will issue an alarm information. By issuing an alarm information when the battery state is detected to be abnormal, it is helpful to obtain the abnormal operation state of the battery group in time and solve it in time, and improve the maintenance efficiency.

[0009] Preferably, the normalization calculation formula of Q(x), T(x) and M(x) is respectively: 、 and , wherein, Q normal , Tnormal and M normal respectively are normal discharge capacity, temperature, number of fault-free single battery when any one battery pack discharges, max represents the maximum discharge capacity of the battery pack, T max and T min respectively are the highest and lowest temperatures that can be tolerated by the battery pack when discharging, N total represents the total number of single batteries. By normalizing the discharge capacity, temperature, and number of fault-free single batteries of the battery pack, the purpose is to unify the dimensions of the three and evaluate the battery performance of the battery pack from three aspects.

[0010] Preferably, the charge-discharge core capacity monitoring module is connected to the battery remote core capacity platform, and the battery remote core capacity platform displays through a large screen to display the running state of the battery remote intelligent core capacity system in a graphical, digital, and chart form in real time. Real-time visual analysis of the battery state through the battery remote core capacity platform helps to accurately judge the real-time running state of the battery.

[0011] In a second aspect, a remote intelligent battery capacity determination method is provided, which comprises the following steps: S1, detecting the state of a corresponding battery pack by any one of the battery equalization maintenance units, and uploading the state parameters of the battery pack and the single battery obtained after the detection to the charge-discharge capacity determination monitoring module and the corresponding MCU control device, and determining the current state of the corresponding battery pack according to the state parameters by the charge-discharge capacity determination monitoring module and the MCU control device; S2, when the battery pack is in a normal operating state, discharging the battery pack, first setting the target discharge parameters of the battery pack by the charge-discharge capacity determination monitoring module, then closing the discharge switch and the grid-connected switch of the battery pack by the charge-discharge capacity determination monitoring module, connecting the discharge circuit, and starting the discharge by the charge-discharge grid-connected capacity determination device according to the target discharge parameters, so as to convert the direct current of the battery pack into alternating current and then transmit the alternating current to the station power; S3, after the discharge is completed, charging the battery pack, first setting the target charging parameters of the battery pack by the charge-discharge capacity determination monitoring module, then closing the discharge switch and the grid-connected switch of the battery pack by the charge-discharge capacity determination monitoring module, connecting the charging circuit, and performing the charging process by the charge-discharge grid-connected capacity determination device, so as to convert the input alternating current into direct current to supply power to the battery pack according to the target charging parameters; and S4, when the battery pack is in an abnormal operating state, the charge-discharge capacity determination monitoring module controls the discharge switch and the grid-connected switch of the battery pack to be in an open state, and simultaneously sends a signal of the abnormal state of the battery pack to the remote battery capacity determination platform. The method can further improve the efficiency and accuracy of the charge-discharge capacity determination of the battery pack by remotely controlling the charge-discharge process of the battery pack by the charge-discharge capacity determination monitoring module and checking the operating state of the battery pack in real time by the battery equalization maintenance unit.

[0012] Preferably, in step S1, each battery pack is connected in communication with one battery equalization maintenance unit through an RS485 communication protocol, wherein the state parameters collected by the battery equalization maintenance unit include the voltage and current data of the battery pack and the voltage, temperature and internal resistance data of the single battery. The state parameters of the battery pack and the single battery can be collected in real time by the battery equalization maintenance unit, so that the charge-discharge capacity determination process of the battery pack is more safe and reliable.

[0013] Preferably, in step S2, when the battery pack is discharged for capacity determination, the discharge capacity is calculated by integrating the discharge current, and the discharge capacity calculation method is: discharge current x discharge time. By setting the voltage, current and time parameters during the discharge of the battery pack, the discharge capacity determination process of the battery pack can be more convenient, and the capacity data of the current battery pack can be obtained.

[0014] Preferably, the battery pack target discharge parameters include discharge voltage, discharge current, discharge power and discharge time; and the battery pack target charge parameters include charge voltage, charge current, charge power and charge time. By setting the parameters of the battery pack during charging and discharging, the battery pack can be remotely controlled to charge and discharge more safely and conveniently.

[0015] Preferably, the battery pack charging and discharging mode includes manual and automatic modes. The manual charging and discharging mode discharges according to human operation, and the automatic charging and discharging mode automatically determines the operation required by the current battery pack according to the current operation state of the battery pack through the charging and discharging capacity monitoring module. By setting the manual and automatic charging and discharging modes, the corresponding mode can be selected for capacity monitoring according to the maintenance requirements, thereby improving the maintenance efficiency.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] The technical scheme of the present application is a remote intelligent capacity monitoring system for batteries, which is an intelligent remote capacity monitoring system for batteries that integrates remote charging and discharging management, real-time monitoring, battery performance analysis and online balancing maintenance functions. The remote intelligent capacity monitoring system for batteries uses an inverter grid-connected mode for charging and discharging capacity monitoring, does not generate heat, and feeds back the energy of the recovered batteries to the AC side of the mains for use by other equipment, which is more environmentally friendly. The charging and discharging process of the battery pack is remotely controlled by the charging and discharging capacity monitoring module, and the running state of the battery pack is viewed in real time by the battery balancing maintenance unit, which can further improve the efficiency and accuracy of the charging and discharging capacity monitoring of the battery pack. At the same time, for the daily operation and maintenance of 110V / 220V batteries, the professional and fine management requirements of the batteries can be met, the hidden dangers caused by manual operation can be reduced, the maintenance efficiency can be improved, and the maintenance cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 Fig. 1 is a structural schematic diagram of a remote intelligent capacity monitoring system for batteries;

[0019] Fig. 2 Fig. 2 is a flowchart of a remote intelligent capacity monitoring method for batteries. DETAILED DESCRIPTION

[0020] The technical scheme of the present application will be described in detail below with reference to the accompanying drawings of the embodiments of the present application. Figs. 1-2 The technical scheme of the embodiments of the present application will be described in detail.

[0021] As Fig. 1As shown, it is a structure schematic diagram of a battery remote intelligent capacity system, wherein the battery remote intelligent capacity system comprises a charge-discharge capacity monitoring module, a charge-discharge grid-connected capacity device, two battery groups, two battery equalization maintenance units and two MCU control devices; wherein, 1000AH / 104 indicates that each battery group is composed of 104 single batteries through series-parallel connection, and the total capacity of each battery group is 1000 ampere-hours; QFD1 indicates a battery group discharge switch SK1, and QFD2 indicates a battery group discharge switch SK2, which are respectively responsible for the connection and disconnection of the charge-discharge circuit of the corresponding battery group, controlled by the charge-discharge capacity monitoring module, and in the abbreviation QFD, Q represents a power switch device, FD is short for FangDian, indicating discharge; QF3 indicates a grid-connected switch, which is responsible for the connection and disconnection of the circuit between the charge-discharge grid-connected capacity device and the station power; RT is short for Resistance Temperature, indicating resistance temperature, RT11, RT12, RT22 and RT21 all indicate temperature sensors for real-time monitoring of the temperature of the battery group during charge and discharge; and the battery remote intelligent capacity system can normally work when the grid-connected discharge voltage is AC220V and AC380V; the system of the application integrates functions such as remote charge-discharge management of the battery, real-time monitoring, battery performance analysis and online equalization maintenance, and adopts an inverter grid-connected mode for charge-discharge capacity, which can reduce the hidden dangers caused by manual operation, improve maintenance efficiency and reduce maintenance cost.

[0022] The system specifically comprises the following contents:

[0023] The battery remote intelligent capacity system comprises a charge-discharge capacity monitoring module, a charge-discharge grid-connected capacity device, a plurality of battery groups, a plurality of battery equalization maintenance units and a plurality of MCU control devices, and each battery group corresponds to a battery equalization maintenance unit and an MCU control device; wherein, the user can independently determine the number of battery groups according to the use demand, and when any one of the plurality of battery groups is subjected to charge-discharge capacity, the remaining battery groups are used as station power to generate power, specifically:

[0024] The charge-discharge capacity monitoring module is connected with the charge-discharge grid-connected capacity device through an RS485 communication protocol, used for controlling the charge-discharge grid-connected capacity device to perform charge-discharge operation, supporting remote control of the charge-discharge grid-connected capacity device to start and stop the charge-discharge of each battery group and real-time viewing of the running state of each battery group and each single battery, and capable of automatically converting between normal running state, charging state and discharging state according to requirements to realize automatic operation of the charge-discharge process.

[0025] The charge-discharge grid-connected capacity checking device is connected with each battery pack through a DC bus, and a discharge switch of each battery pack is arranged on each DC bus, which is used to control the connection and disconnection of the charge-discharge circuit under the control of the charge-discharge capacity checking monitoring module; when the charge-discharge capacity checking monitoring module detects that the battery pack has the standard of charge-discharge, a closing instruction is sent to the battery pack discharge switch to control the battery pack discharge switch to be closed; when the charge-discharge capacity checking monitoring module detects that the battery pack does not have the standard of charge-discharge, an opening instruction is sent to the battery pack discharge switch to control the battery pack discharge switch to be opened.

[0026] The charge-discharge grid-connected capacity checking device is connected with each battery pack through a DC bus, and a discharge switch of each battery pack is arranged on each DC bus, which is used to control the connection and disconnection of the charge-discharge circuit under the control of the charge-discharge capacity checking monitoring module; when the charge-discharge capacity checking monitoring module detects that the battery pack has the standard of charge-discharge, a closing instruction is sent to the battery pack discharge switch to control the battery pack discharge switch to be closed; when the charge-discharge capacity checking monitoring module detects that the battery pack does not have the standard of charge-discharge, an opening instruction is sent to the battery pack discharge switch to control the battery pack discharge switch to be opened.

[0027] The system can conveniently check the capacity of the battery, obtain the current battery capacity data, and does not generate heat during the capacity checking, and is more green and environmentally friendly.

[0028] Each battery pack includes a plurality of single batteries, and a controllable switch is arranged on the connecting line between each single battery and is controlled by the corresponding MCU control device according to the operating state of each single battery to control the connection and disconnection of the controllable switch.

[0029] When the MCU control device receives the battery state parameters collected by the corresponding battery equalization maintenance unit, if it is detected that the state of a single battery in any battery pack is abnormal, all the control switches connected with the abnormal single battery are controlled to be disconnected, and the discharge capacity checking is performed through the remaining single batteries; meanwhile, during the process that one or more battery packs generate power as the power supply in the station, if it is found that the power generation capacity of the single battery for power generation is insufficient, the charge-discharge capacity checking monitoring module calculates the size of the battery capacity loss of each battery pack and the number of single batteries to be added, and then the other battery packs are opened and the number of single batteries to be added is connected.

[0030] In the embodiment, the charge-discharge grid-connected capacity device is provided with a PCS inverter device. The PCS inverter device is connected with each battery pack through a DC bus. The PCS inverter device is used to realize mutual conversion between DC and AC, converts input commercial power from AC to DC to charge the battery pack, and converts DC of the battery pack to AC for use of the load or feeding into the grid. The PCS stands for Power Conversion System, indicating an inverter device in a power conversion system, which is used for conversion between different power forms. Thus, the energy flow between the battery pack and the grid and the load can be realized through the PCS inverter device, and the power form matching is ensured.

[0031] Each battery equalization maintenance unit comprises a voltage acquisition module, a current acquisition module, an internal resistance measurement module, a temperature acquisition module, an equalization charging module and an equalization discharging module. The voltage acquisition module is used to acquire the voltage of each battery pack and the voltage of each single battery. The current acquisition module is used to acquire the current of each battery pack and single battery during charging and discharging. The internal resistance measurement module is used to measure the internal resistance of each single battery. The temperature acquisition module is used to acquire the ambient temperature of each battery pack and the temperature of each single battery. The equalization charging module receives instructions sent by the charge-discharge capacity monitoring module, and performs equalization charging on the single battery with insufficient capacity and low voltage. The equalization discharging module receives instructions sent by the charge-discharge capacity monitoring module, and performs equalization discharging on the single battery with overcharge or high voltage.

[0032] Each MCU control device is connected with the corresponding battery pack, battery equalization maintenance unit and charge-discharge capacity monitoring module through each interface. The MCU control device is responsible for receiving the state parameters of the battery pack and single battery acquired by the battery equalization maintenance unit in real time, and is also responsible for receiving the discharge capacity information of the corresponding battery pack calculated by the charge-discharge capacity monitoring module in real time, and calculating the battery condition of the corresponding battery pack according to the received data through a genetic algorithm.

[0033] The adaptive function of the current battery pack battery status calculated by the genetic algorithm of any MCU control device is: F(x)=A1(t)×W1×Q(x)-A2(t)×W2×T(x)+A3(t)×W3×M(x), x is an array formed by the upper limit setting value of the discharge current, the upper limit setting value of the discharge voltage and the upper limit setting value of the temperature of the current battery pack; A1(t), A2(t) and A3(t) are respectively the iteration number functions of Q(x), T(x) and M(x), and t is the iteration number; W1, W2 and W3 are all weight adjustment coefficients that dynamically change with the iteration number t; Q(x), T(x) and M(x) respectively represent the discharge capacity, temperature and the number of fault-free single battery that dynamically change with the array x, and all are normalized before operation to unify the dimensions of the three; W1, W2 and W3 are respectively the preset weight of the discharge capacity, the preset weight of the temperature and the preset inertial weight of the number of fault-free single battery.

[0034] Wherein, the evolutionary iteration process of each battery pack battery status calculated by the genetic algorithm is divided into early and late stages, and the corresponding weight is adjusted by using the Sigmoid function, and the iteration number functions of Q(x), T(x) and M(x) in the early and late stages are respectively: , , t0 is the midpoint of the evolutionary iteration, k is the slope coefficient, and e is the base of natural logarithm; wherein, the weight of A1(t) is increased in the early stage of the evolutionary iteration process, to ensure that A1(t)>A2(t)+A3(t), and the weights of A2(t) and A3(t) are increased in the late stage of the evolutionary iteration process, to focus on the search of the core parameter of the battery pack power generation capacity, to ensure that A1(t)<A2(t)+A3(t), to avoid high temperature and take into account the number of single battery problems, and output the optimal solution x based on the adaptive function F(x), and control the current battery pack to adjust according to the optimal solution by the MCU control device, such as: reducing the discharge capacity of the battery pack, reducing the number of single battery in operation and reducing the temperature to a certain value.

[0035] Specifically, the formulas for normalizing Q(x), T(x) and M(x) are respectively: , and , wherein, Q normal , T normal and M normal are respectively the normal discharge capacity, temperature and the number of fault-free single battery of any battery pack during discharge, Q max represents the maximum discharge capacity of the battery pack, T max and T min are respectively the highest and lowest temperatures that the battery pack can withstand during discharge, and N totalrepresents the total number of monomer batteries; by normalizing the discharge capacity, temperature, and number of fault-free monomer batteries of the battery pack, the dimensions of the three are unified, and the battery performance of the battery pack is evaluated from three aspects.

[0036] In this embodiment, when the battery equalization maintenance unit detects that the voltage or current of the battery pack and the voltage, temperature, or internal resistance of the monomer battery exceed or are lower than the set threshold during the charging and discharging process of each battery pack, the charging and discharging capacity monitoring module will issue an alarm information, and the alarm information is uploaded to the battery remote capacity monitoring platform through the charging and discharging capacity monitoring module. The alarm information issued by the current battery remote capacity monitoring system can be directly observed through the battery remote capacity monitoring platform, which helps to obtain the abnormal operation state of the battery pack in time and solve it in time, and improves the maintenance efficiency.

[0037] In this embodiment, the charging and discharging capacity monitoring module is connected to the battery remote capacity monitoring platform, and the battery remote capacity monitoring platform displays through a large screen to display the running state of the battery remote intelligent capacity monitoring system in a graphical, digital, and chart form; specifically, the real-time running state of the DC bus voltage, DC bus current, battery pack voltage, battery pack current, voltage, temperature, and internal resistance of the monomer battery, and resistance load installation environment temperature are monitored and processed, and horizontal and vertical comparison and curve and column chart forms are supported for display, such as: the voltage, temperature, and internal resistance of the monomer battery are displayed in a horizontal and vertical manner, which makes it easier to observe the differences between the monomer batteries; the present application realizes real-time visualization display and analysis of the battery state through the battery remote capacity monitoring platform, which helps to accurately judge the real-time running state of the battery.

[0038] As shown in Fig. 2 The flow chart of a battery remote intelligent capacity monitoring method is shown in the figure, first, the state of the battery pack is detected by the battery equalization maintenance unit to obtain the state parameters of the battery pack and the monomer battery; when the state of the battery pack is normal, the charging and discharging capacity monitoring module controls the charging and discharging grid-connected capacity monitoring device to start discharging according to the discharge parameters; and the charging and discharging capacity monitoring module controls the charging and discharging grid-connected capacity monitoring device to charge according to the charging parameters; when the state of the battery pack is abnormal, the charging and discharging capacity monitoring module controls the battery pack discharge switch and the grid-connected switch to be in the off state; thus, the method of the present application remotely controls the battery pack to perform the charging and discharging process through the charging and discharging capacity monitoring module, and the running state of the battery pack is checked in real time through the battery equalization maintenance unit, which can further improve the efficiency and accuracy of the charging and discharging capacity of the battery pack.

[0039] The method specifically includes the following steps:

[0040] S1, the state of the corresponding battery pack is detected by any one battery equalization maintenance unit, and the state parameters of the battery pack and the single battery obtained after detection are uploaded to the charge-discharge core capacity monitoring module and the corresponding MCU control device, and the current state of the corresponding battery pack is detected by the charge-discharge core capacity monitoring module and the MCU control device according to the state parameters.

[0041] Specifically, in step S1, each battery pack is connected in communication with one battery equalization maintenance unit through RS485 communication protocol, RS485 is a serial communication standard for long-distance data communication; wherein the state parameters collected by the battery equalization maintenance unit include voltage and current data of the battery pack and voltage, temperature and internal resistance data of the single battery, and the state parameters of the battery pack and the single battery can be collected in real time by the battery equalization maintenance unit, so that the charge-discharge core capacity process of the battery pack is more safe and reliable.

[0042] S2, when the voltage and current data of the battery pack and the voltage, temperature and internal resistance data of the single battery are within the set threshold range, it indicates that the battery pack is in normal operating state; when any one battery pack discharges, first set the target discharge parameters of the battery pack through the charge-discharge core capacity monitoring module, the target discharge parameters include discharge voltage, discharge current, discharge power and discharge time, then send the closing instruction to the battery pack discharge switch and the grid-connected switch through RS485 communication protocol by the charge-discharge core capacity monitoring module, control the battery pack discharge switch and the grid-connected switch to close, and connect the discharge circuit; at the same time, send the discharge instruction to the charge-discharge grid-connected core capacity device through RS485 communication protocol by the charge-discharge core capacity monitoring module, control the charge-discharge grid-connected core capacity device to start discharging according to the target discharge parameters, convert the direct current of the battery pack into alternating current and then deliver it to the station power, further avoid the waste of battery power, and get the latest capacity data of the battery pack.

[0043] In this embodiment, in step S2, when any one battery pack discharges the core capacity, the discharge capacity is calculated by integrating and accumulating the discharge current, and the discharge capacity calculation method is: discharge current x discharge time, unit AH; wherein the discharge current output by the battery remote intelligent core capacity system can be set, such as the setting range is 0-100A, so as to ensure that the discharge process meets the standard test conditions, and the battery pack discharge core capacity process can be more convenient, and the capacity data of the current battery pack is obtained.

[0044] S3, after the completion of discharging, when charging any one battery pack, first set the target charging parameters of the battery pack through the charge-discharge capacity monitoring module, the target charging parameters including charging voltage, charging current, charging power and charging time, then send the closing instruction to the battery pack discharge switch and grid-connected switch through the RS485 communication protocol by the charge-discharge capacity monitoring module, control the battery pack discharge switch and grid-connected switch to close, connect the charging circuit; at the same time, send the charging instruction to the charge-discharge grid-connected capacity monitoring device through the RS485 communication protocol by the charge-discharge capacity monitoring module, control the charge-discharge grid-connected capacity monitoring device to carry out the charging process, the charge-discharge grid-connected capacity monitoring device converts the input alternating current into direct current to supply power to the battery pack according to the target charging parameters.

[0045] S4, when the voltage or current of the battery pack and the voltage, temperature and internal resistance of the single battery are detected to exceed or be lower than the set threshold value, it indicates that the battery pack is in an abnormal operating state; the charge-discharge capacity monitoring module sends the opening instruction to the battery pack discharge switch and grid-connected switch through the RS485 communication protocol, controls the battery pack discharge switch and grid-connected switch to open, and at the same time sends the signal of the abnormal state of the battery pack to the battery remote capacity monitoring platform.

[0046] In this embodiment, the battery pack charge-discharge mode includes manual and automatic modes, the manual charge-discharge mode discharges according to human operation, and the automatic charge-discharge mode automatically judges the operation required by the current battery pack according to the current operating state of the battery pack through the charge-discharge capacity monitoring module; when the manual mode is selected, the relevant personnel need to manually start and stop the battery pack to carry out the charge-discharge capacity monitoring process according to the demand, and when the automatic mode is selected, the charge-discharge capacity monitoring module will automatically carry out the charge-discharge capacity monitoring operation of the battery pack according to the current operating state of the battery pack; wherein, the manual charge-discharge mode and the automatic charge-discharge mode need to be selected through the charge-discharge capacity monitoring module. The present application helps to select the corresponding mode for capacity monitoring according to the maintenance demand by setting the manual and automatic charge-discharge modes, and improves the maintenance efficiency.

[0047] In summary, the battery remote intelligent capacity checking system is an intelligent battery remote capacity checking system with functions of remote charge-discharge management, real-time monitoring, battery performance analysis and online balancing maintenance; the battery remote intelligent capacity checking system adopts the way of inverter grid connection for charge-discharge capacity checking, no heat is generated, the energy of the recovered battery is fed back to the AC side of the mains for use by other equipment, which is more green and environmentally friendly; and through the remote control of the charge-discharge capacity checking monitoring module on the battery pack for the charge-discharge process and the real-time viewing of the running state of the battery pack by the battery balancing maintenance unit, the efficiency and accuracy of the battery pack for the charge-discharge capacity checking can be further improved; at the same time, for the daily operation and maintenance work of the 110V / 220V battery, the professional and refined management demand of the battery can be met, the hidden danger caused by manual operation is reduced, the maintenance efficiency is improved, the maintenance cost is reduced, and significant progress is made.

[0048] The above examples only illustrate the technical idea of the present application, and cannot limit the protection scope of the present application, and any modification made according to the technical idea of the present application on the basis of the technical scheme falls within the protection scope of the present application.

Claims

1. A remote intelligent capacity assessment system for storage batteries, characterized in that, It includes a charging / discharging capacity monitoring module, a charging / discharging grid-connected capacity device, several battery packs, several battery balancing maintenance units, and several MCU control devices. Each battery pack corresponds to one battery balancing maintenance unit and one MCU control device. The charge and discharge capacity monitoring module is connected to the charge and discharge grid-connected capacity device via RS485 communication protocol. It is used to control the charge and discharge grid-connected capacity device to perform charge and discharge operations. It supports remote control of the charge and discharge grid-connected capacity device to start and stop the charge and discharge of each battery pack and to view the operating status of each battery pack and each individual battery in real time. The charging and discharging grid-connected capacity-controlled device has a built-in PCS inverter. The PCS inverter is connected to each battery pack via a DC bus, and each battery pack is equipped with a discharge switch on the DC bus to control the connection and disconnection of the charging and discharging circuit under the control of the charging and discharging capacity-controlled monitoring module. Each battery pack consists of several individual batteries, and each individual battery is connected to a controllable switch on a line. The corresponding MCU control device controls the switching on and off of the controllable switch according to the operating status of each individual battery. Specifically, when any MCU control device receives battery status parameters collected from the corresponding battery balancing maintenance unit, if it detects an abnormal status of a single battery in any battery pack, it will disconnect all control switches connected to the abnormal single battery and discharge and verify the capacity through the remaining single battery. At the same time, when one or more battery packs are generating electricity as the working power source in the station, if it is found that the generating capacity of the single battery is insufficient, the charging and discharging capacity verification monitoring module will calculate the amount of battery capacity loss in each battery pack and calculate the number of single batteries to be added. After the calculation is completed, other battery packs will be opened and the required number of single batteries to be added will be connected. Each battery equalization maintenance unit includes a voltage acquisition module, a current acquisition module, an internal resistance measurement module, a temperature acquisition module, an equalization charging module, and an equalization discharging module; Each MCU control device establishes a connection with the corresponding battery pack, battery balancing maintenance unit, and charge / discharge capacity monitoring module through each interface. The MCU control device is responsible for receiving the status parameters of the battery pack and individual batteries collected from the battery balancing maintenance unit in real time. It is also responsible for receiving the discharge capacity information of the corresponding battery pack calculated by the charge / discharge capacity monitoring module in real time, and calculating the battery status of the corresponding battery pack through a genetic algorithm based on the received data. Any MCU control device calculates the adaptive function of the current battery status of the battery pack using a genetic algorithm as follows: F(x) = A1(t) × W1 × Q(x) - A2(t) × W2 × T(x) + A3(t) × W3 × M(x), where x is an array of the current battery pack's upper limit settings for discharge current, upper limit settings for discharge voltage, and upper limit settings for temperature; A1(t), A2(t), and A3(t) correspond to the iteration number functions of Q(x), T(x), and M(x), respectively, where t is the iteration number; W1, W2, and W3 are all weight adjustment coefficients that dynamically change with the iteration number t; Q(x), T(x), and M(x) represent the discharge capacity, temperature, and number of fault-free individual batteries that dynamically change with the array x, respectively, and are all normalized before calculation to unify their dimensions; W1, W2, and W3 are the preset weights for discharge capacity, temperature, and the number of fault-free individual batteries, respectively. Among them, the evolutionary iteration process of calculating the battery condition of each battery pack by the genetic algorithm is divided into the initial stage and the later stage, and the Sigmoid function is used to adjust the corresponding weights. The iteration number functions corresponding to Q(x), T(x), and M(x) in the initial stage and the later stage are respectively: , , where t0 is the midpoint of the evolutionary iteration, k is the slope coefficient, and e is the base of the natural logarithm. Among them, the weight of A1(t) is increased in the initial stage of the evolutionary iteration process to ensure that A1(t) > A2(t) + A3(t). In the later stage of the evolutionary iteration process, the weights of A2(t) and A3(t) are increased to ensure that A1(t) < A2(t) + A3(t). And the optimal solution x is output based on the fitness function F(x), and the current battery pack is controlled by the MCU control device to be adjusted according to the optimal solution.

2. The remote intelligent capacity assessment system for a storage battery according to claim 1, characterized in that, The charging and discharging grid-connected capacity control device is connected to the station power supply via a DC bus, and a grid-connected switch is installed on the DC bus. When any battery pack is charging or discharging, the grid-connected switch is closed or opened under the control of the charging and discharging capacity control monitoring module.

3. The remote intelligent capacity assessment system for a storage battery according to claim 2, characterized in that, During the charging and discharging process of each battery pack, when the corresponding battery equalization maintenance unit detects that the voltage or current of the battery pack, as well as the voltage, temperature, or internal resistance of a single battery cell, exceeds or falls below the set threshold, the charging and discharging capacity monitoring module will issue an alarm message.

4. A remote intelligent capacity assessment system for a storage battery according to claim 2, characterized in that, The formulas for normalizing Q(x), T(x), and M(x) are as follows: , and , where Q normal T normal and M normal Q represents the normal discharge capacity, temperature, and number of fault-free individual batteries in any given battery pack during discharge. max T represents the maximum discharge capacity of the battery pack. max and T min These are the highest and lowest temperatures that the battery pack can withstand during discharge, N. total This indicates the total number of individual batteries.

5. A remote intelligent capacity assessment system for a storage battery according to claim 2, characterized in that, The charge / discharge capacity monitoring module is connected to the remote battery capacity assessment platform, which displays the real-time operating status of the remote intelligent battery capacity assessment system in graphical, digital, and chart formats on a large screen.

6. A method for remote intelligent capacity assessment of a battery, employing the remote intelligent capacity assessment system for a battery as described in any one of claims 1-5, characterized in that, The method includes the following steps: S1. The status of the corresponding battery pack is detected by any battery equalization maintenance unit, and the status parameters of the battery pack and individual batteries obtained after detection are uploaded to the charge-discharge capacity monitoring module and the corresponding MCU control device. The charge-discharge capacity monitoring module and the MCU control device detect the current status of the corresponding battery pack according to the status parameters. S2. When the battery pack is in normal operation and the battery pack is being discharged, the target discharge parameters of the battery pack are first set through the charge and discharge capacity monitoring module. Then, the charge and discharge capacity monitoring module controls the battery pack discharge switch and grid connection switch to close. After the discharge circuit is connected, the charge and discharge capacity monitoring module controls the charge and discharge grid connection capacity device to start discharging according to the target discharge parameters, converting the DC power of the battery pack into AC power and then supplying it to the station's power supply. S3. After the discharge is completed, when charging the battery pack, the target charging parameters of the battery pack are first set through the charge and discharge capacity monitoring module. Then, the charge and discharge capacity monitoring module controls the battery pack discharge switch and grid connection switch to close. After the charging circuit is connected, the charge and discharge capacity monitoring module controls the charge and discharge grid connection capacity device to carry out the charging process. The charge and discharge grid connection capacity device converts the input AC power into DC power to supply power to the battery pack according to the target charging parameters. S4. When the battery pack is in an abnormal operating state, the charge and discharge capacity monitoring module will control the battery pack discharge switch and grid connection switch to be in the off state, and at the same time send a signal of abnormal battery pack status to the battery remote capacity platform.

7. The method for remote intelligent capacity assessment of a storage battery according to claim 6, characterized in that, In step S1, each battery pack is connected to a battery balancing maintenance unit via RS485 communication protocol. The status parameters collected by the battery balancing maintenance unit include the voltage and current data of the battery pack and the voltage, temperature and internal resistance data of individual batteries.

8. A remote intelligent capacity assessment method for a storage battery according to claim 6, characterized in that, In step S2, when the battery pack is discharged and its capacity is assessed, the discharge capacity is calculated by integrating and accumulating the discharge current. The discharge capacity is calculated as: discharge current × discharge time.

9. A remote intelligent capacity assessment method for a storage battery according to claim 6, characterized in that, The target discharge parameters of the battery pack include discharge voltage, discharge current, discharge power, and discharge time; the target charging parameters of the battery pack include charging voltage, charging current, charging power, and charging time.

10. A remote intelligent capacity assessment method for a storage battery according to claim 6, characterized in that, The battery pack has two charging and discharging modes: manual and automatic. The manual charging and discharging mode is based on human operation for discharging, while the automatic charging and discharging mode uses the charging and discharging capacity monitoring module to automatically determine the operation required for the current battery pack based on its operating status.

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