A battery energy storage BMS system based on dual-path information sampling monitoring and protection control

Abstract

The present invention belongs to the technical field of application of electrochemical battery energy storage system, and specifically relates to a battery energy storage BMS system based on dual-path information sampling monitoring and protection control, wherein the battery string monitoring management module in the battery string DC busbar and string balancing control device collects the voltage, current, power and other electric energy parameters and temperature parameters of each battery string and all battery cells in real time, and compares the preset operation assurance parameters of the energy storage system to perform string-level electric energy balancing, and when it is monitored that the parameters of the single battery reach the set dangerous state parameter range, the corresponding battery module single battery monitoring sampling module directly drives the corresponding battery string DC power line on-off switch and protection circuit to disconnect the power path of the corresponding battery string connecting the battery string DC busbar, thereby saving investment and greatly improving the controllability and safety of the energy storage system.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrochemical battery energy storage application, and in particular relates to a battery energy storage BMS system based on dual-path information sampling monitoring and protection control. Background Art

[0002] Battery energy storage system is an important part of electric vehicle new energy power, smart grid and energy Internet. In particular, electrochemical battery energy storage system is a battery string composed of multiple battery cells connected to enter the energy storage inverter equipment for charging and discharging, and completes power regulation and charging and discharging in a controlled manner. Due to the differences in the physical and chemical properties of each battery cell, coupled with the differences in environmental dimensions during installation and operation, the batteries in the battery string produce inconsistencies in voltage and power, which affects the overall efficiency and utilization of the battery string and also brings safety hazards.

[0003] Therefore, real-time monitoring of battery operation, charge and discharge current control, and energy consistency and balance control of the voltage and power of each battery cell in the battery string are the key to the safe, healthy and efficient operation of the energy storage system. For large-scale energy storage systems, the number of battery cells used is huge, and the battery module management unit BMU, battery cluster management unit BCMS, and BAMS for monitoring the battery system are mostly divided into three levels for management and control. The battery module single cell monitoring sampling module is responsible for the real-time monitoring and signal acquisition of battery status parameters, and the upper-level battery cluster management unit processes the battery cluster, module and single cell status (voltage, voltage, current, temperature, SOC, etc.), and manages the charging and discharging process safely. The battery module management unit BMU does not have the control capability to detect and drive the on / off switch of the DC power line of the corresponding battery string. When the battery encounters a dangerous situation, it cannot directly and promptly deal with it, which greatly increases the probability of a serious accident. In addition, most of the existing battery management systems BMS use real-time monitoring and real-time static or dynamic power balancing for each battery cell and a battery pack with multiple battery cells in parallel. Each battery cell and a battery pack with multiple battery cells in parallel is equipped with a balancing electronic circuit and a current loop. A 1MWH battery energy storage system is equipped with thousands of balancing electronic circuits and current loops, which not only greatly increases the investment cost, but also the huge number of balancing electronic circuits and current loops poses immeasurable risks to the energy storage system. Summary of the invention

[0004] In order to solve the defects of the existing technology in the battery management of the energy storage system and save investment on the basis of providing safety, the present invention proposes a battery energy storage BMS system based on dual-path information sampling monitoring and protection control, including: a battery string DC bus and string balancing control device, a battery string monitoring management module, a host computer communication line, a bidirectional energy storage converter communication line, a bidirectional energy storage converter, a battery string DC bus bus, a bidirectional energy storage converter AC power line, a battery string monitoring management module sampling and control information bus, a power grid, an energy storage system host computer, a first battery string, a first battery module, a first battery string, a second battery module, a first battery The mth battery module of the battery string, the single battery monitoring sampling module of the first battery module of the first battery string, the single battery monitoring sampling module of the second battery module of the first battery string, the single battery monitoring sampling module of the mth battery module of the first battery string, the information collection harness of the first battery module of the first battery string, the information collection harness of the second battery module of the first battery string, the information collection harness of the mth battery module of the first battery string, the DC power line of the first battery string, the on-off switch and protection circuit of the DC power line of the first battery string, the fast protection control path of the first battery string, the first battery module of the second battery string, the second battery module of the second battery string Battery module, the mth battery module of the second battery string, the single cell monitoring sampling module of the first battery module of the second battery string, the single cell monitoring sampling module of the second battery module of the second battery string, the single cell monitoring sampling module of the mth battery module of the second battery string, the information collection harness of the first battery module of the second battery string, the information collection harness of the second battery module of the second battery string, the information collection harness of the mth battery module of the second battery string, the DC power line of the second battery string, the on-off switch and protection circuit of the DC power line of the second battery string, the fast protection control path of the second battery string, the first battery module of the Nth battery string block, the second battery module of the Nth battery string, the mth battery module of the Nth battery string, the single battery monitoring sampling module of the first battery module of the Nth battery string, the single battery monitoring sampling module of the second battery module of the Nth battery string, the single battery monitoring sampling module of the mth battery module of the Nth battery string, the information collection harness of the first battery module of the Nth battery string, the information collection harness of the second battery module of the Nth battery string, the information collection harness of the mth battery module of the Nth battery string, the DC power line of the Nth battery string, the on-off switch and protection circuit of the DC power line of the Nth battery string, and the fast protection control path of the Nth battery string, wherein:

[0005] The first battery string DC power line on-off switch and protection circuit, the second battery string DC power line on-off switch and protection circuit, the Nth battery string DC power line on-off switch and protection circuit, the battery string DC busbar and the battery string monitoring management module are installed in one cabinet, forming a battery string DC busbar and string balancing control device for performing battery string power balancing and safety protection on-off control;

[0006] The first battery string is formed by sequentially connecting the positive and negative electrodes of the first battery module of the first battery string, the second battery module of the first battery string, and the mth battery module of the first battery string to form a first battery string;

[0007] The first battery module of the second battery string, the second battery module of the second battery string, and the mth battery module of the second battery string are sequentially connected in series with positive and negative electrodes of two adjacent battery modules to form a second battery string;

[0008] The positive and negative electrodes of two adjacent battery modules of the first battery module of the Nth battery string, the second battery module of the Nth battery string, and the mth battery module of the Nth battery string are connected in series in sequence to form an Nth battery string;

[0009] The single-cell monitoring sampling module of the first battery module of the first battery string, the single-cell monitoring sampling module of the second battery module of the first battery string, and the single-cell monitoring sampling module of the mth battery module of the first battery string are respectively connected to the corresponding single-cell batteries in the first battery module of the first battery string, the second battery module of the first battery string, and the mth battery module of the first battery string through the information collection harness of the first battery module of the first battery string, the information collection harness of the second battery module of the first battery string, and the information collection harness of the mth battery module of the first battery string, and are connected to the battery string monitoring management module through the sampling and control information bus of the battery string monitoring management module to form a full-cell battery information sampling and monitoring communication path of the first battery string, and are connected to the DC power line on-off switch and protection circuit of the first battery string through the fast protection control path of the first battery string to form a real-time monitoring and fast protection direct drive control path of the first battery string;

[0010] The single-cell monitoring sampling module of the first battery module of the second battery string, the single-cell monitoring sampling module of the second battery module of the second battery string, and the single-cell monitoring sampling module of the mth battery module of the second battery string are respectively connected to the corresponding single-cell batteries in the first battery module of the second battery string, the second battery module of the second battery string, and the mth battery module of the second battery string through the information collection harness of the first battery module of the second battery string, the information collection harness of the second battery module of the second battery string, and the information collection harness of the mth battery module of the second battery string, and are connected to the battery string monitoring management module through the sampling and control information bus of the battery string monitoring management module to form a full-cell battery information sampling and monitoring communication path of the second battery string, and are connected to the DC power line on-off switch and protection circuit of the second battery string through the fast protection control path of the second battery string to form a real-time monitoring and fast protection direct drive control path of the second battery string;

[0011] The single-cell monitoring sampling module of the first battery module of the Nth battery string, the single-cell monitoring sampling module of the second battery module of the Nth battery string, and the single-cell monitoring sampling module of the mth battery module of the Nth battery string are respectively connected to the corresponding single-cell batteries in the first battery module of the Nth battery string, the second battery module of the Nth battery string, and the mth battery module of the Nth battery string through the first battery module information collection harness of the Nth battery string, the second battery module of the Nth battery string, and the mth battery module of the Nth battery string respectively, and the battery string monitoring management module is connected through the battery string monitoring management module sampling and control information bus to form the Nth battery string full-cell battery information sampling monitoring communication path, and at the same time, the DC power line on-off switch and protection circuit of the Nth battery string are connected through the Nth battery string fast protection control path to form the real-time monitoring and fast protection direct drive control path of the Nth battery string;

[0012] The first battery string is connected to the first battery string DC power line on-off switch and protection circuit via the first battery string DC power line, and the first battery string DC power line on-off switch and protection circuit are connected to the power grid in sequence via the battery string DC busbar, the bidirectional energy storage converter, and the bidirectional energy storage converter AC power line, forming a power path for charging and discharging the first battery string;

[0013] The second battery string is connected to the second battery string DC power line on-off switch and protection circuit via the second battery string DC power line, and the second battery string DC power line on-off switch and protection circuit are connected to the power grid in sequence via the battery string DC busbar, the bidirectional energy storage converter, and the bidirectional energy storage converter AC power line, forming a power path for charging and discharging the second battery string;

[0014] The Nth battery string is connected to the Nth battery string DC power line on-off switch and protection circuit via the Nth battery string DC power line, and the Nth battery string DC power line on-off switch and protection circuit are connected to the power grid in sequence via the battery string DC busbar, the bidirectional energy storage converter, and the bidirectional energy storage converter AC power line, forming a power path for charging and discharging the Nth battery string;

[0015] The battery string monitoring and management module is connected to the single-cell monitoring and sampling module of the first battery module of the first battery string, the single-cell monitoring and sampling module of the second battery module of the first battery string, the single-cell monitoring and sampling module of the mth battery module of the first battery string, the single-cell monitoring and sampling module of the first battery module of the second battery string, the single-cell monitoring and sampling module of the second battery module of the second battery string, and the single-cell monitoring and sampling module of the mth battery module of the second battery string through the battery string monitoring and management module sampling and control information bus. The single cell monitoring sampling module of the first battery module of the Nth battery string, the single cell monitoring sampling module of the second battery module of the Nth battery string, the single cell monitoring sampling module of the mth battery module of the Nth battery string, and the DC power line on-off switch and protection circuit of the first battery string, the DC power line on-off switch and protection circuit of the second battery string, and the DC power line on-off switch and protection circuit of the Nth battery string constitute a communication link for real-time monitoring of each battery string and all battery cells of the overall energy storage system and energy balancing management and control of the battery string;

[0016] The battery string monitoring and management module is connected to the bidirectional energy storage converter via the bidirectional energy storage converter communication line, forming an auxiliary control link for the battery string monitoring and management module to manage and control the bidirectional energy storage converter to perform power regulation of battery charging and discharging and battery string power balancing;

[0017] The host computer of the energy storage system is connected to the battery string monitoring and management module through the host computer communication line, forming a control communication link for the host computer of the energy storage system to monitor and control the charging and discharging of the battery string in real time through the battery string monitoring and management module;

[0018] The host computer of the energy storage system is connected to the bidirectional energy storage converter via the host computer communication line, forming a control link for the host computer of the energy storage system to regulate the charging and discharging of the bidirectional energy storage converter;

[0019] An operation control method of a battery energy storage BMS system based on dual-path information sampling monitoring and protection control is:

[0020] ① During the power-on and operation of a battery energy storage BMS system based on dual-path information sampling monitoring and protection control, the battery string monitoring management module in the battery string DC convergence and string balancing control device monitors each battery string and all battery cells in real time through each battery module single cell monitoring sampling module and the energy storage system host computer;

[0021] ②When the BMS system is abnormal, it will alarm and stop running;

[0022] ③When the BMS system is normal, when the single cell monitoring sampling module of each battery module detects that the parameters of one or more single cells have not reached the set dangerous state parameter range, it continues to operate ④; otherwise, the single cell monitoring sampling module of the corresponding battery module implements control and immediately disconnects the power path of the corresponding battery string connected to the battery string DC busbar through the corresponding battery string fast protection control path connected to the DC power line on-off switch and protection circuit of the battery string, so that the power path of the corresponding battery string is disconnected and maintained. At the same time, the single cell monitoring sampling module of the corresponding battery module sends out the corresponding alarm information. When the parameters of the corresponding single cell are out of the set dangerous state parameter range, it continues to operate ④;

[0023] ④ The battery string monitoring and management module of the battery string DC bus and string balancing control device monitors the voltage, current, temperature and information parameters of the stored electricity of each battery string and all battery cells of the energy storage system in real time through the single-cell monitoring sampling module of each battery module, and compares the consistency of the battery cell parameters of each battery string, and compares and judges with the preset operation assurance parameters of the energy storage system. When it is detected that the preset operation assurance parameter requirements of the energy storage system are not met, an alarm message is sent to the bidirectional energy storage converter and the upper computer of the energy storage system. At the same time, the on-off switch of the DC power line of the corresponding battery string in the battery string DC bus and string balancing control device and the on-off of the protection circuit are controlled according to the parameter conditions set by the energy storage system, and the charging and discharging power of the bidirectional energy storage converter is adjusted accordingly;

[0024] ⑤ When the preset operation guarantee parameters of the energy storage system are met, the host computer of the energy storage system monitors the real-time information parameters of each battery string and all battery cells of the energy storage system in real time according to the power demand of the power grid and the battery string DC convergence and string balancing control device. The battery string monitoring management module and the single battery monitoring sampling module of each battery module monitor the real-time information parameters of each battery string and all battery cells of the energy storage system, and controls the charging and discharging power of the bidirectional energy storage converter according to the preset control strategy of the energy storage system; ⑥ is performed during charging, and ⑦ is performed during discharging;

[0025] ⑥Continue to operate. The host computer of the energy storage system monitors the real-time information parameters of each battery string and all battery cells of the energy storage system through the battery string monitoring management module and the single battery monitoring sampling module of each battery module in the battery string DC convergence and string balancing control device, and performs battery string power balancing control according to the inconsistency between the corresponding battery strings and the preset operation assurance parameters of the energy storage system. That is, during the charging process, the battery strings with power higher than the average value of each battery string and consistency deviation value higher than the operation assurance requirement are controlled to disconnect the DC power line on-off switch and protection circuit of the corresponding battery string and stop charging. After that, when the power of the corresponding battery string is lower than the average value of each battery string and the consistency deviation value is within the range of the operation assurance requirement, the DC power line on-off switch and protection circuit of the corresponding battery string are controlled to close and continue charging, and then go to ①;

[0026] ⑦ Continue to operate. The host computer of the energy storage system monitors the real-time information parameters of each battery string and all battery cells of the energy storage system through the battery string monitoring management module and the single battery monitoring sampling module of each battery module in the battery string DC convergence and string balancing control device, and performs battery string electric energy balancing control according to the inconsistency between the corresponding battery strings and the preset operation assurance parameters of the energy storage system. That is, during the discharge process, the battery string with electric energy lower than the average value of each battery string and the consistency deviation value lower than the operation assurance requirement controls the corresponding battery string DC power line on-off switch and protection circuit to disconnect and stop discharging. Afterwards, when the electric energy and parameters of the corresponding battery string are higher than the average value of each battery string and the consistency deviation value is within the operation assurance requirement range, the corresponding battery string DC power line on-off switch and protection circuit are controlled to close and continue discharging, and then turn to ①;

[0027] After the battery energy storage BMS system based on dual-path information sampling monitoring and protection control is started normally, when monitoring finds dangerous parameters, the battery module single cell monitoring sampling module directly drives and controls to disconnect the DC power path of the corresponding battery string. When monitoring finds that the operating guarantee parameter requirement value range is exceeded, the battery string monitoring management module performs regulation and control of the dual-path control strategy. The energy storage system host computer controls and circulates the operation of steps ① to ⑦, and disconnects the power path of the corresponding battery string whose electric energy is higher than the average value of each battery string during charging and lower than the average value of each battery string during discharging and whose consistency deviation value is greater than the preset operating guarantee parameter requirement value of the energy storage system in real time. When the balance is met and the normal operating condition parameter value is reached, the corresponding power path is connected, so that the power of each battery string is balanced and meets the consistency requirements, thereby controlling the safe and efficient operation of the overall energy storage system.

[0028] The battery energy storage BMS system based on dual-path information sampling monitoring and protection control, wherein the battery string monitoring and management module is characterized by comprising: a battery string monitoring and management module bus, an embedded processor, a control strategy and parameter module, a data storage device, a power supply circuit, a communication processing circuit, a control processing circuit, a clock circuit, and an insulation detection circuit, wherein:

[0029] The embedded processor is connected to the control strategy and parameter module, data storage device, power supply circuit, communication processing circuit, control processing circuit, clock circuit and insulation detection circuit through the battery string monitoring and management module bus, forming an information link for monitoring and managing the battery strings and processing and controlling the data.

[0030] The battery energy storage BMS system based on dual-path information sampling monitoring and protection control, wherein the battery module single cell monitoring sampling module is characterized by comprising: a monitoring sampling module bus, a sampling module embedded processor, a sampling module data storage device, a sampling module clock circuit, a sampling module power supply circuit, a sampling module communication processing circuit, a control drive circuit, a voltage sampling circuit, a current sampling circuit, a temperature sampling circuit, and a sampling module insulation detection circuit, wherein:

[0031] The sampling module embedded processor is connected to the sampling module data storage, sampling module clock circuit, sampling module power supply circuit, sampling module communication processing circuit, control drive circuit, voltage sampling circuit, current sampling circuit, temperature sampling circuit, and sampling module insulation detection circuit through the monitoring sampling module bus, forming a management and control link for monitoring and sampling of single cells in the battery module.

[0032] The present invention belongs to the technical field of application of electrochemical battery energy storage system, and specifically relates to a battery energy storage BMS system based on dual-path information sampling monitoring and protection control, wherein the battery string monitoring management module in the battery string DC busbar and string balancing control device collects the voltage, current, power and other electric energy parameters and temperature parameters of each battery string and all battery cells in real time, and compares the preset operation assurance parameters of the energy storage system to perform string-level electric energy balancing, and when it is monitored that the parameters of the single battery reach the set dangerous state parameter range, the corresponding battery module single battery monitoring sampling module directly drives the corresponding battery string DC power line on-off switch and protection circuit to disconnect the power path of the corresponding battery string connecting the battery string DC busbar, which greatly reduces the risk of setting a large number of battery cell balancing electronic circuits and the increase of current loops, and greatly improves the safety of the energy storage system while saving investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1The figure is a schematic diagram of the composition and principle of a battery energy storage BMS system based on dual-path information sampling monitoring and protection control.

[0034] Figure 2 This is a schematic diagram of the composition and principle of the battery string monitoring and management module.

[0035] Figure 3 This is a schematic diagram of the composition and principle of the battery module single cell monitoring sampling module. DETAILED DESCRIPTION

[0036] As an implementation example, a battery string unit module and a monitoring and management system are described in conjunction with the accompanying drawings. However, the described embodiment is a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The technology and solutions of the present invention are not limited to the contents given in this embodiment example.

[0037] like Figure 1As shown, a battery energy storage BMS system based on dual-path information sampling monitoring and protection control comprises: a battery string DC busbar and string balancing control device (1), a battery string monitoring management module (2), a host computer communication line (3), a bidirectional energy storage converter communication line (4), a bidirectional energy storage converter (5), a battery string DC busbar (6), a bidirectional energy storage converter AC power line (7), a battery string monitoring management module sampling and control information bus (8), a power grid (9), an energy storage system host computer (30), a first battery module (101) of a first battery string, a second battery module (102) of a first battery string, an mth battery module (10m) of a first battery string, and a A single-cell monitoring sampling module (111) for the first battery module in the first battery group string, a single-cell monitoring sampling module (112) for the second battery module in the first battery group string, a single-cell monitoring sampling module (11m) for the mth battery module in the first battery group string, a first battery module information collection harness (121) for the first battery module in the first battery group string, a second battery module information collection harness (122) for the first battery module in the first battery group string, an mth battery module information collection harness (12m) for the first battery group string, a DC power line (13) for the first battery group string, a DC power line on / off switch and protection circuit (14) for the first battery group string, a fast protection control path (15) for the first battery group string, a first battery module (201) for the second battery group string, and a DC power line on / off switch and protection circuit (14) for the first battery group string. A second battery module (202) of a battery string, an mth battery module (20m) of a second battery string, a single-cell monitoring sampling module (211) of a first battery module of a second battery string, a single-cell monitoring sampling module (212) of a second battery module of a second battery string, a single-cell monitoring sampling module (21m) of an mth battery module of a second battery string, an information collection harness (221) of a first battery module of a second battery string, an information collection harness (222) of a second battery module of a second battery string, an information collection harness (22m) of an mth battery module of a second battery string, a DC power line (23) of a second battery string, an on / off switch and a protection circuit (24) of a DC power line of a second battery string, a second battery string fast protection control path (25), a first battery module (N01) of an Nth battery string, a second battery module (N02) of an Nth battery string, an mth battery module (N0m) of an Nth battery string, a single-cell monitoring sampling module (N11) of a first battery module of an Nth battery string, a single-cell monitoring sampling module (N12) of a second battery module of an Nth battery string, a single-cell monitoring sampling module (N1m) of an mth battery module of an Nth battery string, a first battery module information collection harness (N21) of an Nth battery string, a second battery module information collection harness (N22) of an Nth battery string, an mth battery module information collection harness (N2m) of an Nth battery string,The Nth battery string DC power line (N3), the Nth battery string DC power line on-off switch and protection circuit (N4), the Nth battery string fast protection control path (N5), wherein:

[0038] The first battery string DC power line on-off switch and protection circuit (14), the second battery string DC power line on-off switch and protection circuit (24), the Nth battery string DC power line on-off switch and protection circuit (N4), the battery string DC busbar (6) and the battery string monitoring management module (2) are installed in a cabinet to form a battery string DC busbar and string balancing control device (1) for performing battery string power balancing and safety protection on-off control;

[0039] The first battery string (10) is formed by connecting the positive and negative electrodes of the first battery module (101) of the first battery string, the second battery module (102) of the first battery string, and the mth battery module (10m) of the first battery string in sequence in series to form the first battery string;

[0040] The first battery module (201) of the second battery string, the second battery module (202) of the second battery string, and the mth battery module (20m) of the second battery string are sequentially connected in series with positive and negative electrodes of two adjacent battery modules to form a second battery string (20);

[0041] The positive and negative electrodes of two adjacent battery modules of the first battery module (N01) of the Nth battery string, the second battery module (N02) of the Nth battery string, and the mth battery module (N0m) of the Nth battery string are connected in series to form an Nth battery string (N0);

[0042] The single-cell monitoring sampling module (111) of the first battery module of the first battery string, the single-cell monitoring sampling module (112) of the second battery module of the first battery string, and the single-cell monitoring sampling module (11m) of the mth battery module of the first battery string are respectively connected to the first battery module (101) of the first battery string, the second battery module (102) of the first battery string, and the mth battery module (103) of the first battery string through the first battery module information collection harness (121) of the first battery string, the second battery module information collection harness (122) of the first battery string, and the mth battery module information collection harness (12m) of the first battery string. Each corresponding single battery in the second battery module (102) of the battery string and the mth battery module (10m) of the first battery string is connected to the battery string monitoring and management module (2) through the battery string monitoring and management module sampling and control information bus (8), forming a first battery string full single battery information sampling monitoring communication path, and at the same time connecting the first battery string DC power line on-off switch and protection circuit (14) through the first battery string fast protection control path (15), forming a real-time monitoring and fast protection direct drive control path for the first battery string (10);

[0043] The single-cell monitoring sampling module (211) of the first storage battery module of the second storage battery string, the single-cell monitoring sampling module (212) of the second storage battery module of the second storage battery string, and the single-cell monitoring sampling module (21m) of the mth storage battery module of the second storage battery string are respectively connected to the first storage battery module (201) of the second storage battery string, the second storage battery module (202) of the second storage battery string, and the mth storage battery module (203) of the second storage battery string through the first storage battery module information collection harness (221) of the second storage battery string, the second storage battery module information collection harness (222) of the second storage battery string, and the mth storage battery module information collection harness (22m) of the second storage battery string. Each corresponding single battery in the second battery module (202) of the battery string and the mth battery module (20m) of the second battery string is connected to the battery string monitoring and management module (2) through the battery string monitoring and management module sampling and control information bus (8), forming a second battery string full single battery information sampling monitoring communication path, and at the same time connecting the second battery string DC power line on-off switch and protection circuit (24) through the second battery string fast protection control path (25), forming a real-time monitoring and fast protection direct drive control path for the second battery string (20);

[0044] The single-cell monitoring sampling module (N11) of the first battery module of the Nth battery string, the single-cell monitoring sampling module (N12) of the second battery module of the Nth battery string, and the single-cell monitoring sampling module (N1m) of the mth battery module of the Nth battery string are respectively connected to the first battery module (N01) of the Nth battery string, the second battery module information collection harness (N21) of the Nth battery string, and the mth battery module information collection harness (N22) of the Nth battery string, respectively. Each corresponding single battery in the second battery module (N02) of the string and the mth battery module (N0m) of the Nth battery string is connected to the battery string monitoring and management module (2) through the battery string monitoring and management module sampling and control information bus (8), forming an information sampling and monitoring communication path for all single batteries of the Nth battery string, and at the same time, the Nth battery string DC power line on-off switch and protection circuit (N4) are connected through the Nth battery string fast protection control path (N5), forming a real-time monitoring and fast protection direct drive control path for the Nth battery string (N0);

[0045] The first battery string (10) is connected to the first battery string DC power line on-off switch and protection circuit (14) via the first battery string DC power line (13), and the first battery string DC power line on-off switch and protection circuit (14) are connected to the power grid (9) in sequence via the battery string DC busbar (6), the bidirectional energy storage converter (5), and the bidirectional energy storage converter AC power line (7), thereby forming a power path for charging and discharging the first battery string (10);

[0046] The second battery string (20) is connected to the second battery string DC power line on-off switch and protection circuit (24) via the second battery string DC power line (23), and the second battery string DC power line on-off switch and protection circuit (24) are connected to the power grid (9) in sequence via the battery string DC busbar (6), the bidirectional energy storage converter (5), and the bidirectional energy storage converter AC power line (7), thereby forming a power path for charging and discharging the second battery string (20);

[0047] The Nth battery string (N0) is connected to the Nth battery string DC power line on-off switch and protection circuit (N4) via the Nth battery string DC power line (N3), and the Nth battery string DC power line on-off switch and protection circuit (N4) are connected to the power grid (9) in sequence via the battery string DC busbar (6), the bidirectional energy storage converter (5), and the bidirectional energy storage converter AC power line (7), thereby forming a power path for charging and discharging the Nth battery string (N0);

[0048] The battery string monitoring management module (2) is respectively connected to the first battery module single cell monitoring sampling module (111) of the first battery string, the second battery module single cell monitoring sampling module (112) of the first battery string, the mth battery module single cell monitoring sampling module (11m) of the first battery string, the first battery module single cell monitoring sampling module (211) of the second battery string, the second battery module single cell monitoring sampling module (212) of the second battery string, and the mth battery module single cell monitoring sampling module (21m) of the second battery string through the battery string monitoring management module sampling and control information bus (8). 1m), a single-cell monitoring sampling module (N11) of the first battery module of the Nth battery string, a single-cell monitoring sampling module (N12) of the second battery module of the Nth battery string, a single-cell monitoring sampling module (N1m) of the mth battery module of the Nth battery string, and a DC power line on-off switch and protection circuit (14) of the first battery string, a DC power line on-off switch and protection circuit (24) of the second battery string, and a DC power line on-off switch and protection circuit (N4) of the Nth battery string, forming a communication link for real-time monitoring of each battery string and all battery cells of the overall energy storage system and energy balancing management and control of the battery string;

[0049] The battery string monitoring and management module (2) is connected to the bidirectional energy storage converter (5) via the bidirectional energy storage converter communication line (4), forming an auxiliary control link for the battery string monitoring and management module (2) to manage and control the bidirectional energy storage converter (5) to perform power regulation of battery charging and discharging and battery string power balancing;

[0050] The energy storage system host computer (30) is connected to the battery string monitoring and management module (2) via the host computer communication line (3), thereby forming a control communication link for the energy storage system host computer (30) to monitor and control the charging and discharging of the battery string in real time via the battery string monitoring and management module (2);

[0051] The energy storage system host computer (30) is connected to the bidirectional energy storage converter (5) via the host computer communication line (3), thereby forming a control link for the energy storage system host computer (30) to regulate the charging and discharging of the bidirectional energy storage converter (5);

[0052] An operation control method of a battery energy storage BMS system based on dual-path information sampling monitoring and protection control is:

[0053] ① During the power-on and operation of a battery energy storage BMS system based on dual-path information sampling monitoring and protection control, a battery string monitoring management module (2) in a battery string DC convergence and string balancing control device (1) simultaneously monitors each battery string and all battery cells in real time through each battery module single cell monitoring sampling module and an energy storage system host computer (30);

[0054] ②When the BMS system is abnormal, it will alarm and stop running;

[0055] ③ When the BMS system is normal, when the single cell monitoring sampling module of each battery module detects that the parameters of one or more single cells do not reach the set dangerous state parameter range, it continues to operate ④; otherwise, the single cell monitoring sampling module of the corresponding battery module immediately disconnects the power path of the corresponding battery string connected to the battery string DC busbar (6) through the corresponding battery string fast protection control path connected to the DC power line on-off switch and protection circuit of the battery string, so that the power path of the corresponding battery string is in a disconnected and maintained state, and at the same time, the single cell monitoring sampling module of the corresponding battery module sends a corresponding alarm message, and when the parameters of the corresponding single cell are out of the set dangerous state parameter range, it continues to operate ④;

[0056] ④ The battery string monitoring management module (2) of the battery string DC convergence and string balancing control device (1) monitors the voltage, current, temperature and information parameters of the stored electricity of each battery string and all battery cells of the energy storage system in real time through the single cell monitoring sampling modules of each battery module, and compares the consistency of the battery cell parameters of each battery string, and compares and judges with the preset operation assurance parameters of the energy storage system. When it is detected that the preset operation assurance parameter requirements of the energy storage system are not met, an alarm message is sent to the bidirectional energy storage converter (5) and the energy storage system host computer (30), and at the same time, the on-off switch of the corresponding battery string DC power line and the protection circuit in the battery string DC convergence and string balancing control device (1) are controlled according to the parameter conditions set by the energy storage system, and the charging and discharging power of the bidirectional energy storage converter (5) is adjusted accordingly;

[0057] ⑤ When the preset operation guarantee parameters of the energy storage system are met, the energy storage system host computer (30) monitors the real-time information parameters of each battery string and all battery cells of the energy storage system in real time according to the power demand of the power grid (9) and the battery string DC convergence and string balancing control device (1) and the battery string monitoring management module (2) and the battery module single cell monitoring sampling module, and controls the charging and discharging power of the bidirectional energy storage converter (5) according to the preset control strategy of the energy storage system; ⑥ is performed during charging, and ⑦ is performed during discharging;

[0058] ⑥ Continue to operate. The upper computer (30) of the energy storage system monitors the real-time information parameters of each battery string and all battery cells of the energy storage system in real time through the battery string monitoring management module (2) and the single cell monitoring sampling module of each battery module in the battery string DC convergence and string balancing control device (1), and performs battery string electric energy balancing control according to the inconsistency degree between the corresponding battery strings and the comparison of the preset operation assurance parameters of the energy storage system. That is, during the charging process, for the battery strings whose electric energy is higher than the average value of each battery string and whose consistency deviation value is higher than the operation assurance requirement, the DC power line on / off switch and protection circuit of the corresponding battery string are controlled to be disconnected and charging is stopped. Afterwards, when the electric energy of the corresponding battery string is lower than the average value of each battery string and the consistency deviation value is within the operation assurance requirement range, the DC power line on / off switch and protection circuit of the corresponding battery string are controlled to be closed and charging is continued. Turn to ①;

[0059] ⑦ Continue to operate. The upper computer (30) of the energy storage system monitors the real-time information parameters of each battery string and all battery cells of the energy storage system in real time through the battery string monitoring management module (2) and the single cell monitoring sampling module of each battery module in the battery string DC convergence and string balancing control device (1), and performs battery string electric energy balancing control according to the inconsistency degree between the corresponding battery strings and the comparison of the preset operation assurance parameters of the energy storage system. That is, during the discharge process, for the battery string whose electric energy is lower than the average value of each battery string and whose consistency deviation value is lower than the operation assurance requirement, the DC power line on-off switch and protection circuit of the corresponding battery string are controlled to be disconnected and the discharge is stopped. Afterwards, when the electric energy and parameters of the corresponding battery string are higher than the average value of each battery string and the consistency deviation value is within the operation assurance requirement range, the DC power line on-off switch and protection circuit of the corresponding battery string are controlled to be closed and the discharge is continued. Turn to ①;

[0060] After the battery energy storage BMS system based on dual-path information sampling monitoring and protection control is started normally, when monitoring finds dangerous state parameters, the battery module single cell monitoring sampling module directly drives and controls to disconnect the DC power path of the corresponding battery string, and when monitoring finds that the operation assurance parameter requirement value range is exceeded, the battery string monitoring management module (2) performs regulation and control. The energy storage system host computer (30) controls and circulates the first to seventh steps, and disconnects the power path of the corresponding battery string whose electric energy is higher than the average value of each battery string during charging and lower than the average value of each battery string during discharging and whose consistency deviation value is greater than the operation assurance parameter requirement value preset by the energy storage system in real time. When the balance is met and the normal operating condition parameter value is reached, the corresponding power path is connected, so that the power of each battery string is balanced and meets the consistency requirement, thereby controlling the safe and efficient operation of the overall energy storage system.

[0061] like Figure 2As shown, a battery energy storage BMS system based on dual-path information sampling monitoring and protection control, wherein the battery string monitoring management module is characterized by comprising: a battery string monitoring management module bus (21.20), an embedded processor (2121), a control strategy and parameter module (2122), a data storage device (2123), a power supply circuit (2124), a communication processing circuit (2126), a control processing circuit (2127), a clock circuit (2128), and an insulation detection circuit (2129), wherein:

[0062] The embedded processor (2121) is connected to the control strategy and parameter module (2122), the data storage device (2123), the power supply circuit (2124), the communication processing circuit (2126), the control processing circuit (2127), the clock circuit (2128), and the insulation detection circuit (2129) respectively through the battery string monitoring and management module bus (21120), thereby forming an information link for monitoring and managing the battery string and processing and controlling the data.

[0063] like Figure 3 As shown, a battery energy storage BMS system based on dual-path information sampling monitoring and protection control, wherein the battery module single cell monitoring sampling module is characterized by comprising: a monitoring sampling module bus (2020), a sampling module embedded processor (2021), a sampling module data storage device (2022), a sampling module clock circuit (2023), a sampling module power supply circuit (2025), a sampling module communication processing circuit (2026), a control drive circuit (2027), a voltage sampling circuit (2028), a current sampling circuit (2029), a temperature sampling circuit (2030), and a sampling module insulation detection circuit (2031), wherein:

[0064] The sampling module embedded processor (2021) is respectively connected to the sampling module data storage (2022), the sampling module clock circuit (2023), the sampling module power supply circuit (2025), the sampling module communication processing circuit (2026), the control drive circuit (2027), the voltage sampling circuit (2028), the current sampling circuit (2029), the temperature sampling circuit (2030), and the sampling module insulation detection circuit (2031) through the monitoring sampling module bus (2020), thereby forming a control link for monitoring and sampling of single cells in the battery module.

[0065] The present invention belongs to the technical field of application of electrochemical battery energy storage system, and specifically relates to a battery energy storage BMS system based on dual-path information sampling monitoring and protection control, wherein a battery string monitoring management module (2) in a battery string DC busbar and string balancing control device (1) collects voltage, current, power and other electric energy parameters and temperature parameters of each battery string and all battery cells in real time and compares them with the preset operation assurance parameters of the energy storage system to perform string-level electric energy balancing, and when it is monitored that the parameters of the single battery reach a set dangerous state parameter range, the corresponding battery module single battery monitoring sampling module directly drives the corresponding battery string DC power line on-off switch and protection circuit to disconnect the power path of the corresponding battery string connected to the battery string DC busbar (6), thereby greatly reducing the risk of setting a large number of battery cell balancing electronic circuits and the increase of current loops, saving investment and greatly improving the safety of the energy storage system.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery energy storage BMS system based on dual-path information sampling monitoring and protection control, comprising: A battery string DC busbar and string balancing control device (1), a battery string monitoring and management module (2), a host computer communication line (3), a bidirectional energy storage converter communication line (4), a bidirectional energy storage converter (5), a battery string DC busbar (6), a bidirectional energy storage converter AC power line (7), a battery string monitoring and management module sampling and control information bus (8), a power grid (9), an energy storage system host computer (30), a first battery module (101) of a first battery string, a second battery module (102) of a first battery string, an mth battery module (10m) of a first battery string, a single cell monitoring and sampling module (111) of a first battery module of a first battery string, and a second battery module of a first battery string. A single cell monitoring sampling module (112), a single cell monitoring sampling module (11m) for the mth battery module of the first battery string, a first battery module information collection harness (121) for the first battery string, a second battery module information collection harness (122) for the first battery string, an mth battery module information collection harness (12m) for the first battery string, a first battery string DC power line (13), a first battery string DC power line on / off switch and protection circuit (14), a first battery string fast protection control path (15), a first battery module (201) for the second battery string, a second battery module (202) for the second battery string, an mth battery module (20m) for the second battery string, and a second battery module (203) for the second battery string. A single-cell monitoring sampling module (211) for the first storage battery module of a battery string, a single-cell monitoring sampling module (212) for the second storage battery module of a second storage battery string, a single-cell monitoring sampling module (21m) for the mth storage battery module of a second storage battery string, a first storage battery module information collection harness (221) for the second storage battery string, a second storage battery module information collection harness (222) for the second storage battery string, an mth storage battery module information collection harness (22m) for the second storage battery string, a DC power line (23) for the second storage battery string, a DC power line on / off switch and protection circuit (24) for the second storage battery string, a fast protection control path (25) for the second storage battery string, a first storage battery module (N01) for the Nth storage battery string, a second storage battery module information collection harness (221) for the first storage battery module of ... DC power line on / off switch and protection circuit (24) for the second storage battery string, a DC power line on / off switch and protection circuit (24) for the second storage battery string, a DC power the second battery module (N02) of the Nth battery string, the mth battery module (N0m) of the Nth battery string, the single cell monitoring sampling module (N11) of the first battery module of the Nth battery string, the single cell monitoring sampling module (N12) of the second battery module of the Nth battery string, the single cell monitoring sampling module (N1m) of the mth battery module of the Nth battery string, the first battery module information collection harness (N21) of the Nth battery string, the second battery module information collection harness (N22) of the Nth battery string, the mth battery module information collection harness (N2m) of the Nth battery string, the DC power line (N3) of the Nth battery string, the DC power line on / off switch and protection circuit (N4) of the Nth battery string,The Nth battery string fast protection control path (N5), wherein: The first battery string DC power line on-off switch and protection circuit (14), the second battery string DC power line on-off switch and protection circuit (24), the Nth battery string DC power line on-off switch and protection circuit (N4), the battery string DC busbar (6) and the battery string monitoring management module (2) are installed in a cabinet to form a battery string DC busbar and string balancing control device (1) for performing battery string power balancing and safety protection on-off control; The first battery string (10) is formed by connecting the positive and negative electrodes of the first battery module (101) of the first battery string, the second battery module (102) of the first battery string, and the mth battery module (10m) of the first battery string in sequence in series to form the first battery string; The first battery module (201) of the second battery string, the second battery module (202) of the second battery string, and the mth battery module (20m) of the second battery string are sequentially connected in series with positive and negative electrodes of two adjacent battery modules to form a second battery string (20); The positive and negative electrodes of two adjacent battery modules of the first battery module (N01) of the Nth battery string, the second battery module (N02) of the Nth battery string, and the mth battery module (N0m) of the Nth battery string are connected in series to form an Nth battery string (N0); The single-cell monitoring sampling module (111) of the first battery module of the first battery string, the single-cell monitoring sampling module (112) of the second battery module of the first battery string, and the single-cell monitoring sampling module (11m) of the mth battery module of the first battery string are respectively connected to the first battery module (101) of the first battery string, the second battery module (102) of the first battery string, and the mth battery module (103) of the first battery string through the first battery module information collection harness (121) of the first battery string, the second battery module information collection harness (122) of the first battery string, and the mth battery module information collection harness (12m) of the first battery string. Each corresponding single battery in the second battery module (102) of the battery string and the mth battery module (10m) of the first battery string is connected to the battery string monitoring and management module (2) through the battery string monitoring and management module sampling and control information bus (8), forming a first battery string full single battery information sampling monitoring communication path, and at the same time connecting the first battery string DC power line on-off switch and protection circuit (14) through the first battery string fast protection control path (15), forming a real-time monitoring and fast protection direct drive control path for the first battery string (10); The single-cell monitoring sampling module (211) of the first storage battery module of the second storage battery string, the single-cell monitoring sampling module (212) of the second storage battery module of the second storage battery string, and the single-cell monitoring sampling module (21m) of the mth storage battery module of the second storage battery string are respectively connected to the first storage battery module (201) of the second storage battery string, the second storage battery module (202) of the second storage battery string, and the mth storage battery module (203) of the second storage battery string through the first storage battery module information collection harness (221) of the second storage battery string, the second storage battery module information collection harness (222) of the second storage battery string, and the mth storage battery module information collection harness (22m) of the second storage battery string. Each corresponding single battery in the second battery module (202) of the battery string and the mth battery module (20m) of the second battery string is connected to the battery string monitoring and management module (2) through the battery string monitoring and management module sampling and control information bus (8), forming a second battery string full single battery information sampling monitoring communication path, and at the same time connecting the second battery string DC power line on-off switch and protection circuit (24) through the second battery string fast protection control path (25), forming a real-time monitoring and fast protection direct drive control path for the second battery string (20); The single-cell monitoring sampling module (N11) of the first battery module of the Nth battery string, the single-cell monitoring sampling module (N12) of the second battery module of the Nth battery string, and the single-cell monitoring sampling module (N1m) of the mth battery module of the Nth battery string are respectively connected to the first battery module (N01) of the Nth battery string, the second battery module information collection harness (N21) of the Nth battery string, and the mth battery module information collection harness (N22) of the Nth battery string, respectively. Each corresponding single battery in the second battery module (N02) of the string and the mth battery module (N0m) of the Nth battery string is connected to the battery string monitoring and management module (2) through the battery string monitoring and management module sampling and control information bus (8), forming an information sampling and monitoring communication path for all single batteries of the Nth battery string, and at the same time, the Nth battery string DC power line on-off switch and protection circuit (N4) are connected through the Nth battery string fast protection control path (N5), forming a real-time monitoring and fast protection direct drive control path for the Nth battery string (N0); The first battery string (10) is connected to the first battery string DC power line on-off switch and protection circuit (14) via the first battery string DC power line (13), and the first battery string DC power line on-off switch and protection circuit (14) are connected to the power grid (9) in sequence via the battery string DC busbar (6), the bidirectional energy storage converter (5), and the bidirectional energy storage converter AC power line (7), thereby forming a power path for charging and discharging the first battery string (10); The second battery string (20) is connected to the second battery string DC power line on-off switch and protection circuit (24) via the second battery string DC power line (23), and the second battery string DC power line on-off switch and protection circuit (24) are connected to the power grid (9) in sequence via the battery string DC busbar (6), the bidirectional energy storage converter (5), and the bidirectional energy storage converter AC power line (7), thereby forming a power path for charging and discharging the second battery string (20); The Nth battery string (N0) is connected to the Nth battery string DC power line on-off switch and protection circuit (N4) via the Nth battery string DC power line (N3), and the Nth battery string DC power line on-off switch and protection circuit (N4) are connected to the power grid (9) in sequence via the battery string DC busbar (6), the bidirectional energy storage converter (5), and the bidirectional energy storage converter AC power line (7), thereby forming a power path for charging and discharging the Nth battery string (N0); The battery string monitoring management module (2) is respectively connected to the first battery module single cell monitoring sampling module (111) of the first battery string, the second battery module single cell monitoring sampling module (112) of the first battery string, the mth battery module single cell monitoring sampling module (11m) of the first battery string, the first battery module single cell monitoring sampling module (211) of the second battery string, the second battery module single cell monitoring sampling module (212) of the second battery string, and the mth battery module single cell monitoring sampling module (21m) of the second battery string through the battery string monitoring management module sampling and control information bus (8). 1m), a single-cell monitoring sampling module (N11) of the first battery module of the Nth battery string, a single-cell monitoring sampling module (N12) of the second battery module of the Nth battery string, a single-cell monitoring sampling module (N1m) of the mth battery module of the Nth battery string, and a DC power line on-off switch and protection circuit (14) of the first battery string, a DC power line on-off switch and protection circuit (24) of the second battery string, and a DC power line on-off switch and protection circuit (N4) of the Nth battery string, forming a communication link for real-time monitoring of each battery string and all battery cells of the overall energy storage system and energy balancing management and control of the battery string; The battery string monitoring and management module (2) is connected to the bidirectional energy storage converter (5) via the bidirectional energy storage converter communication line (4), forming an auxiliary control link for the battery string monitoring and management module (2) to manage and control the bidirectional energy storage converter (5) to perform power regulation of battery charging and discharging and battery string power balancing; The energy storage system host computer (30) is connected to the battery string monitoring and management module (2) via the host computer communication line (3), thereby forming a control communication link for the energy storage system host computer (30) to monitor and control the charging and discharging of the battery string in real time via the battery string monitoring and management module (2); The energy storage system host computer (30) is connected to the bidirectional energy storage converter (5) via the host computer communication line (3), thereby forming a control link for the energy storage system host computer (30) to regulate the charging and discharging of the bidirectional energy storage converter (5); An operation control method of a battery energy storage BMS system based on dual-path information sampling monitoring and protection control is: ① During the power-on and operation of a battery energy storage BMS system based on dual-path information sampling monitoring and protection control, a battery string monitoring management module (2) in a battery string DC convergence and string balancing control device (1) simultaneously monitors each battery string and all battery cells in real time through each battery module single cell monitoring sampling module and an energy storage system host computer (30); ②When the BMS system is abnormal, it will alarm and stop running; ③ When the BMS system is normal, when the single cell monitoring sampling module of each battery module detects that the parameters of one or more single cells have not reached the set dangerous state parameter range, it continues to operate ④; otherwise, the single cell monitoring sampling module of the corresponding battery module implements control and immediately disconnects the power path of the corresponding battery string connected to the battery string DC busbar (6) through the corresponding battery string fast protection control path connected to the DC power line on-off switch and protection circuit of the battery string, so that the power path of the corresponding battery string is in a disconnected and maintained state, and at the same time, the single cell monitoring sampling module of the corresponding battery module sends a corresponding alarm message, and when the parameters of the corresponding single cell are out of the set dangerous state parameter range, it continues to operate ④; ④ The battery string monitoring management module (2) of the battery string DC convergence and string balancing control device (1) monitors the voltage, current, temperature and information parameters of the stored electricity of each battery string and all battery cells of the energy storage system in real time through the single cell monitoring sampling modules of each battery module, and compares the consistency of the battery cell parameters of each battery string, and compares and judges with the preset operation assurance parameters of the energy storage system. When it is detected that the preset operation assurance parameter requirements of the energy storage system are not met, an alarm message is sent to the bidirectional energy storage converter (5) and the energy storage system host computer (30), and at the same time, the on-off switch of the corresponding battery string DC power line and the protection circuit in the battery string DC convergence and string balancing control device (1) are controlled according to the parameter conditions set by the energy storage system, and the charging and discharging power of the bidirectional energy storage converter (5) is adjusted accordingly; ⑤ When the preset operation guarantee parameters of the energy storage system are met, the energy storage system host computer (30) monitors the real-time information parameters of each battery string and all battery cells of the energy storage system in real time according to the power demand of the power grid (9) and the battery string DC convergence and string balancing control device (1) and the battery string monitoring management module (2) and the battery module single cell monitoring sampling module, and controls the charging and discharging power of the bidirectional energy storage converter (5) according to the preset control strategy of the energy storage system; ⑥ is performed during charging, and ⑦ is performed during discharging; ⑥ Continue to operate. The upper computer (30) of the energy storage system monitors the real-time information parameters of each battery string and all battery cells of the energy storage system in real time through the battery string monitoring management module (2) and the single cell monitoring sampling module of each battery module in the battery string DC convergence and string balancing control device (1), and performs battery string electric energy balancing control according to the inconsistency degree between the corresponding battery strings and the comparison of the preset operation assurance parameters of the energy storage system. That is, during the charging process, for the battery strings whose electric energy is higher than the average value of each battery string and whose consistency deviation value is higher than the operation assurance requirement, the DC power line on / off switch and protection circuit of the corresponding battery string are controlled to be disconnected and charging is stopped. Afterwards, when the electric energy of the corresponding battery string is lower than the average value of each battery string and the consistency deviation value is within the operation assurance requirement range, the DC power line on / off switch and protection circuit of the corresponding battery string are controlled to be closed and charging is continued. Turn to ①; ⑦ Continue to operate. The upper computer (30) of the energy storage system monitors the real-time information parameters of each battery string and all battery cells of the energy storage system in real time through the battery string monitoring management module (2) and the single cell monitoring sampling module of each battery module in the battery string DC convergence and string balancing control device (1), and performs battery string electric energy balancing control according to the inconsistency degree between the corresponding battery strings and the comparison of the preset operation assurance parameters of the energy storage system. That is, during the discharge process, for the battery string whose electric energy is lower than the average value of each battery string and whose consistency deviation value is lower than the operation assurance requirement, the DC power line on-off switch and protection circuit of the corresponding battery string are controlled to be disconnected and the discharge is stopped. Afterwards, when the electric energy and parameters of the corresponding battery string are higher than the average value of each battery string and the consistency deviation value is within the operation assurance requirement range, the DC power line on-off switch and protection circuit of the corresponding battery string are controlled to be closed and the discharge is continued. Turn to ①; After the battery energy storage BMS system based on dual-path information sampling monitoring and protection control is started normally, when monitoring finds dangerous state parameters, the battery module single cell monitoring sampling module directly drives and controls to disconnect the DC power path of the corresponding battery string, and when monitoring finds that the operation assurance parameter requirement value range is exceeded, the battery string monitoring management module (2) performs regulation and control. The energy storage system host computer (30) controls and circulates the first to seventh steps, and disconnects the power path of the corresponding battery string whose electric energy is higher than the average value of each battery string during charging and lower than the average value of each battery string during discharging and whose consistency deviation value is greater than the operation assurance parameter requirement value preset by the energy storage system in real time. When the balance is met and the normal operating condition parameter value is reached, the corresponding power path is connected, so that the power of each battery string is balanced and meets the consistency requirement, thereby controlling the safe and efficient operation of the overall energy storage system.

2. According to the battery energy storage BMS system based on dual-path information sampling monitoring and protection control as claimed in claim 1, the battery string monitoring management module (2) is characterized by comprising: A battery string monitoring and management module bus (2120), an embedded processor (2121), a control strategy and parameter module (2122), a data storage device (2123), a power supply circuit (2124), a communication processing circuit (2126), a control processing circuit (2127), a clock circuit (2128), and an insulation detection circuit (2129), wherein: The embedded processor (2121) is connected to the control strategy and parameter module (2122), the data storage device (2123), the power supply circuit (2124), the communication processing circuit (2126), the control processing circuit (2127), the clock circuit (2128), and the insulation detection circuit (2129) respectively through the battery string monitoring and management module bus (2120), thereby forming an information link for monitoring and managing the battery string and processing and controlling the data.

3. According to the battery energy storage BMS system based on dual-path information sampling monitoring and protection control as described in claim 1, the battery module single cell monitoring sampling module is characterized by comprising: A monitoring sampling module bus (2020), a sampling module embedded processor (2021), a sampling module data storage (2022), a sampling module clock circuit (2023), a sampling module power supply circuit (2025), a sampling module communication processing circuit (2026), a control drive circuit (2027), a voltage sampling circuit (2028), a current sampling circuit (2029), a temperature sampling circuit (2030), and a sampling module insulation detection circuit (2031), wherein: The sampling module embedded processor (2021) is respectively connected to the sampling module data storage (2022), the sampling module clock circuit (2023), the sampling module power supply circuit (2025), the sampling module communication processing circuit (2026), the control drive circuit (2027), the voltage sampling circuit (2028), the current sampling circuit (2029), the temperature sampling circuit (2030), and the sampling module insulation detection circuit (2031) through the monitoring sampling module bus (2020), thereby forming a control link for monitoring and sampling of single cells in the battery module.

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