A battery online status monitoring system and monitoring method

Abstract

The present invention provides a battery online status monitoring system, including a single battery monitoring module, a battery group monitoring module, a remote platform, a mobile device, a power module and a protection module, wherein each single battery detection module corresponds to a single battery. The present invention also provides a monitoring method based on the battery online status monitoring system, which realizes online real-time monitoring of the battery group by collecting the operating status of the battery group and the battery single cell, including the group terminal voltage, current, AC cross-over voltage and the single cell voltage, temperature and internal resistance parameters; alarms are given for general over-limit faults by setting thresholds, and abnormal information is fed back to the upper computer in real time, thereby improving the stability of system operation, avoiding accidents, replacing manual regular inspections, and reducing maintenance costs.

Description

Technical Field

[0001] The invention belongs to the technical field of battery monitoring, and in particular relates to a battery online status monitoring system and a monitoring method. Background Art

[0002] As an important power source for the DC power supply system of power plants, substations and converter stations, the battery group is the only device for the DC system in the power system and communication system to supply power to the outside. Its performance is directly related to the safety and reliability of the power system and communication system. Its power supply capacity is the final guarantee for the stable operation of plant and station equipment. The reliability of the battery group ultimately determines the reliability of the DC system, which in turn has a significant impact on the stable operation of the power grid. Therefore, the stability of the battery and its capacity released during the actual discharge process are of great significance to ensure the normal operation of power equipment.

[0003] In recent years, there have been many open-circuit failures of batteries in the domestic power system, resulting in protection failure and over-tripping in substations, and even causing large-scale power outages; battery short-circuit failures have caused battery packs to burn out; there have also been voltage loss accidents of batteries and DC buses, resulting in serious consequences such as burning out of main substations; therefore, regular monitoring of batteries is a very necessary and important link that cannot be ignored.

[0004] The life of a battery is directly related to the floating charge operation mode and operating temperature. A battery with a problem usually shows an increase in internal resistance. Therefore, real-time online monitoring of the battery, timely identification and treatment of faulty single batteries can effectively increase the service life of the battery pack. However, existing battery monitoring devices are either unable to perform online monitoring or lack comprehensive monitoring of the physical parameters of the battery, and cannot completely replace manual monitoring, resulting in a large monitoring workload and the monitoring results cannot reflect the battery status in real time and comprehensively. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a battery online status monitoring system and a monitoring method for realizing the functions of real-time monitoring of the battery status and outputting monitoring information.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a battery online status monitoring system, assuming that there are n single-cell batteries to be monitored, n≥1, including single-cell battery monitoring module 1, single-cell battery monitoring module 2, ..., single-cell battery monitoring module n for collecting data including internal resistance, voltage and temperature of single-cell batteries, and a battery group monitoring module for collecting data including group terminal voltage, group terminal current, and AC inrush voltage of a battery group, comparing the collected data with a preset value and outputting an alarm signal when the comparison result exceeds a preset range; single-cell battery monitoring module n includes single-cell sensor n, single-cell filter module n, single-cell control module n and single-cell communication module n, and the battery group monitoring module includes a group terminal sensor, a group terminal filter module, a group terminal control module, a group terminal end communication module and comparison module; the detection end of the single sensor n is connected to the single battery n, the signal output end of the single sensor n is connected to the signal input end of the single filter module n, the signal output end of the single filter module n is connected to the signal input end of the single control module n, the signal output end of the single control module n is connected to the signal input end of the single communication module n, and the signal output end of the single communication module n is connected to the signal input end of the group-end communication module; the detection end of the group-end sensor is connected to the battery group, the signal output end of the group-end sensor is connected to the signal input end of the group-end filter module, the signal output end of the group-end filter module is connected to the signal input end of the group-end control module, and the signal transceiver end of the group-end control module is respectively connected to the signal transceiver end of the comparison module and the signal transceiver end of the group-end communication module.

[0007] According to the above scheme, the single cell sensor n includes an internal resistance tester n, a single cell voltmeter n and a single cell temperature sensor n; the test end of the internal resistance tester n is connected in parallel with the charge and discharge end of the single cell storage battery n, the test end of the single cell voltmeter n is connected in parallel with the charge and discharge end of the single cell storage battery n, and the detection end of the single cell temperature sensor n is in close contact with the outer surface of the single cell storage battery n.

[0008] According to the above scheme, the group-end sensor includes a group-end voltmeter, a group-end ammeter and an ambient temperature sensor; the group-end voltmeter is connected in parallel with the output end of the battery pack, the group-end ammeter is connected in series in the output circuit of the battery pack, and the ambient temperature sensor is arranged on the outside of the outer casing of the battery pack; the battery pack monitoring module also includes an AC simulation device for simulating AC inrush voltage, and the AC output end of the AC simulation device is respectively connected to the positive pole of the output end of the battery pack and the ground.

[0009] According to the above solution, the battery pack monitoring module also includes a storage module for storing received information, and the signal transceiver end of the storage module is connected to the signal transceiver end of the group end communication module.

[0010] According to the above scheme, the battery group monitoring module also includes an input module for converting user operations into electrical signals and sending them to the group-end control module, and an output module for displaying the received information to the user. The input module includes buttons, knobs and keyboards, and the signal input ends of the buttons, knobs and keyboards are respectively connected to the signal output ends of the group-end control module; the output module includes a display module and an audible and visual alarm, and the signal input end of the display module is connected to the signal output end of the group-end control module, and the switch of the audible and visual alarm is connected to the alarm dry contact of the group-end control module.

[0011] According to the above scheme, the battery pack monitoring module also includes a network module, a wireless module and a text message module. The signal transceiver ends of the network module and the wireless module are respectively connected to the signal transceiver end of the group end communication module, and the signal input end of the text message module is connected to the signal output end of the group end communication module.

[0012] Furthermore, it also includes a remote platform and a mobile device for receiving and analyzing information output by the battery group monitoring module and sending control commands to the battery group monitoring module; the remote platform is connected to the group-end communication module through the network module; the mobile device is connected to the group-end communication module through the wireless module and the SMS module respectively.

[0013] According to the above scheme, it also includes a power module and a protection module for providing overcurrent protection for the system. The power output end of the power module is connected to the power input end of the system, and the protection module is connected in series in the power loop.

[0014] A method for monitoring the online state of a battery comprises the following steps:

[0015] S1: Check whether the protection index and test accuracy of the battery online status monitoring system meet the design requirements; if not, repair the battery online status monitoring system and repeat this step; if satisfied, execute step S2;

[0016] S2: Connect the battery pack to be tested to the battery pack monitoring module, and connect the single battery 1, single battery 2, ..., single battery n in the group to the single battery monitoring module 1, single battery monitoring module 2, ..., single battery monitoring module n in sequence;

[0017] S3: The single battery monitoring module n collects the voltage, temperature and internal resistance data of the single battery n and sends it to the battery pack monitoring module;

[0018] S4: The battery pack monitoring module collects the battery pack terminal voltage, terminal current and AC inrush voltage;

[0019] S5: The battery pack monitoring module receives and saves the preset values ​​of the voltage, temperature and internal resistance of the single battery n, as well as the preset values ​​of the group terminal voltage, group terminal current and AC inrush voltage of the battery pack sent by the host computer;

[0020] S6: The battery pack monitoring module compares the data obtained in step S3 and step S4 with the corresponding preset values ​​obtained in step S5. If the comparison result exceeds the preset value range, an audible and visual alarm is issued, and the data obtained in steps S3, S4 and S5 are packaged and sent to the host computer; if the comparison result does not exceed the preset value range, the cycle starts from step S3.

[0021] Furthermore, in the step S1, the specific steps are:

[0022] S11: Perform reliability tests including withstand voltage and surge protection on the battery online status monitoring system respectively; if the design requirements are not met, repair the battery online status monitoring system and repeat this step; if the design requirements are met, execute step S12;

[0023] S12: Select 5 to 10 single cells from a group of batteries and connect them to the corresponding single cell monitoring modules, and collect the voltage, temperature and internal resistance of each single cell respectively; use an independent test tool to measure the voltage, temperature and internal resistance of each single cell respectively; compare the data measured by the test tool with the data uploaded by the corresponding single cell monitoring module, if the error exceeds the preset value range, repair or replace the single cell monitoring module and repeat this step; if the error is within the preset value range, continue testing until the measurement errors of all single cell monitoring modules are within the preset value range, and the parameter changes of the single cells before and after the test are within the preset value range, then it is considered that the single cell monitoring module meets the design requirements; if the parameter changes of the tested single cell before and after the test exceed the preset value range, replace the single cell and the corresponding single cell monitoring module and re-execute this step;

[0024] S13: Connect the battery pack to the battery pack monitoring module and connect it in parallel to the two ends of the charging device, and connect the single battery 1, single battery 2, ..., single battery n in the group to the single battery monitoring module 1, single battery monitoring module 2, ..., single battery monitoring module n in sequence; connect the detection end of the current transmitter to the group end loop of the battery pack, and connect the signal output end of the current transmitter to the signal input end of the group end filter module of the battery pack monitoring module; the AC output end of the AC simulation device is connected to the positive electrode of the battery pack and the ground respectively; the battery pack monitoring module is connected to the host computer through the group end communication module;

[0025] S14: The system is powered on, and the host computer sends the preset values ​​of the battery group terminal voltage, group terminal current and AC inrush voltage, as well as the voltage, internal resistance and temperature of the single battery to the battery group monitoring module; the battery group monitoring module receives the preset values ​​and determines whether the battery group terminal voltage, group terminal current, AC inrush voltage, and the voltage, internal resistance and temperature of the single battery are normal. If not, the battery group monitoring module is repaired and this step is repeated; if normal, the preset values ​​of the group terminal voltage, group terminal current and AC inrush voltage are changed and the charging equipment is disconnected. After the system has run for a period of time, it is checked whether the battery group monitoring module can normally send an undervoltage alarm If it cannot, repair the battery pack monitoring module and repeat this step; if it can, connect the charging equipment and increase the charging voltage, check whether the battery pack monitoring module can normally send the overcurrent alarm information, if it cannot, repair the battery pack monitoring module and repeat this step; if it can, change the preset values ​​of the voltage, temperature and internal resistance of the single battery, check whether the battery pack monitoring module can normally send the voltage, temperature and internal resistance alarm information of the single battery in the current state, if it cannot, repair the battery pack monitoring module and repeat this step; if it can, the protection indicators and test accuracy of the battery online status monitoring system meet the design requirements.

[0026] The beneficial effects of the present invention are:

[0027] 1. The battery online status monitoring system of the present invention monitors, saves and uploads the voltage, internal resistance and temperature of the single battery, as well as the terminal voltage and terminal current of the battery pack, and issues an alarm according to the set threshold value, thereby achieving the function of real-time monitoring of the battery status and outputting monitoring information, thus overcoming the shortcomings of the existing static, offline and intermittent battery monitoring system.

[0028] 2. The monitoring method of the present invention automatically monitors and collects data from the battery group and analyzes the battery capacity data through big data networking. The monitoring results are comprehensive and effective. It can promptly detect the insufficient capacity of the battery, especially the open circuit and short circuit faults of the battery, and replace it in time to eliminate safety hazards, prevent the protection equipment from refusing to operate due to battery failure, effectively provide the battery's accident discharge capacity, give full play to the backup role of the battery, and maximize the safety of the power grid.

[0029] 3. The present invention is easy to operate, replaces the traditional manual periodic inspection work, reduces the labor intensity of operation and maintenance personnel, and improves work quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a functional block diagram of an embodiment of the present invention.

[0031] Figure 2 It is a monitoring flow chart of an embodiment of the present invention.

[0032] Figure 3 4 is a flow chart of the inspection of the system according to the embodiment of the present invention.

[0033] Figure 4 It is a test connection diagram of a single battery monitoring module according to an embodiment of the present invention.

[0034] Figure 5 1 is a test connection diagram of a battery pack monitoring module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] See also Figure 1 The battery pack monitored by the embodiment of the present invention includes n single batteries, n≥1, and the embodiment of the present invention includes a single battery monitoring module 1, a single battery monitoring module 2, ..., a single battery monitoring module n, a battery pack monitoring module, a remote platform, a mobile device, a power module and a protection module, each single battery detection module corresponds to a single battery; the single battery monitoring module is used to collect the internal resistance, voltage and temperature data of the single battery; the battery pack monitoring module is used to collect the group terminal voltage, group terminal current, and AC inrush voltage data of the battery pack, compare the collected data with the preset value, and output an alarm signal when the comparison result exceeds the preset range, and at the same time perform an audible and visual alarm, and package the state quantity and the alarm information and upload them to the host computer; the remote platform is used to receive and analyze the information output by the battery pack monitoring module and send a control command to the battery pack monitoring module; the mobile device is used for a portable control system; the power module is used to power the system; and the protection module is used to provide a surge protection function for the system.

[0037] The single-cell storage battery monitoring module n includes a single-cell sensor n, a single-cell filter module n, a single-cell control module n and a single-cell communication module n; the single-cell sensor n includes an internal resistance tester n, a single-cell voltmeter n and a single-cell temperature sensor n; the test end of the internal resistance tester n is connected in parallel with the charge and discharge end of the single-cell storage battery n, the test end of the single-cell voltmeter n is connected in parallel with the charge and discharge end of the single-cell storage battery n, and the detection end of the single-cell temperature sensor n is in close contact with the outer surface of the single-cell storage battery n; the signal output ends of the internal resistance tester n, the single-cell voltmeter n and the single-cell temperature sensor n are respectively connected to the signal input end of the single-cell filter module n, the signal output end of the single-cell filter module n is connected to the signal input end of the single-cell control module n, the signal output end of the single-cell control module n is connected to the signal input end of the single-cell communication module n, and the signal output end of the single-cell communication module n is connected to the signal input end of the group-end communication module of the battery group monitoring module.

[0038] The battery pack monitoring module includes a group-end sensor, an AC simulation device, a group-end filtering module, a group-end control module, a group-end communication module, a comparison module, a storage module, an input module, an output module, a network module, a wireless module and a text message module, wherein the AC simulation device is used to simulate the AC inrush voltage, the storage module is used to store the received collected data, preset values ​​and fault information, the comparison module is used to compare the received collected data with the received preset values ​​and output the comparison result, the input module is used to convert the user operation into an electrical signal and send it to the group-end control module, and the output module is used to display the received internal resistance, voltage and temperature of the single battery, the group-end voltage, group-end current and ambient temperature information of the battery pack to the user in real time, and issue an alarm prompt according to the preset value, so as to timely detect battery faults and give early warnings based on intelligent analysis. The group-end sensor includes a group-end voltmeter, a current transmitter and an ambient temperature sensor; the group-end voltmeter is connected in parallel with the output end of the battery pack, the detection end of the current transmitter is connected to the output circuit of the battery pack, and the ambient temperature sensor is arranged outside the outer shell of the battery pack; the signal output end of the group-end sensor is connected to the signal input end of the group-end filter module, the signal output end of the group-end filter module is connected to the signal input end of the group-end control module, the signal transceiver end of the group-end control module is respectively connected to the signal transceiver end of the comparison module, the signal transceiver end of the group-end communication module and the signal transceiver end of the storage module; the group-end communication module includes at least three RS485 communication interfaces; the AC output end of the AC simulation device is respectively connected to the positive pole of the battery pack and the ground; The input module includes buttons, knobs and a keyboard, and the signal output ends of the buttons, knobs and keyboard are respectively connected to the signal input end of the group-end control module; the output module includes a display module and an audible and visual alarm; the signal input end of the display module is connected to the signal output end of the group-end control module, and the display module displays the received data in the form of tables, bar graphs and trend graphs, and provides a historical record data viewing function when the user inquires; the group-end control module includes at least one alarm dry contact, and the switch of the audible and visual alarm is connected to the alarm dry contact of the group-end control module; the signal transceiver ends of the network module and the wireless module are respectively connected to the signal transceiver ends of the group-end communication module, and the signal input end of the SMS module is connected to the signal output end of the group-end communication module.

[0039] The remote platform is connected to the group end communication module through the network module, and the mobile device is connected to the group end communication module through the wireless module and the SMS module respectively; the power output end of the power module is connected to the power input end of the system, and the protection module is connected in series in the power loop.

[0040] See also Figure 2 , a method for monitoring the online state of a battery, comprising the following steps:

[0041] S1: Check whether the protection index and test accuracy of the battery online status monitoring system meet the design requirements; if not, repair the battery online status monitoring system and repeat this step; if satisfied, execute step S2:

[0042] S11: See Figure 3 , respectively, perform reliability tests including withstand voltage and surge protection on the battery online status monitoring system; if the design requirements are not met, repair the battery online status monitoring system and repeat this step; if the design requirements are met, execute step S12;

[0043] S12: See Figure 4 , select 5 to 10 single cells in a group of batteries and connect them to the corresponding single cell monitoring module and collect the voltage, temperature and internal resistance of each single cell respectively; use an independent test tool to measure the voltage, temperature and internal resistance of each single cell respectively; compare the data measured by the test tool with the data uploaded by the corresponding single cell monitoring module, if the error exceeds the preset value range, repair or replace the single cell monitoring module and repeat this step; if the error is within the preset value range, continue testing until the measurement errors of all single cell monitoring modules are within the preset value range, and the parameter changes of the single cells before and after the test are within the preset value range, then it is considered that the single cell monitoring module meets the design requirements; if the parameter changes of the tested single cell before and after the test exceed the preset value range, replace the single cell and the corresponding single cell monitoring module and re-execute this step;

[0044] S13: See Figure 5 , connect the battery pack to the battery pack monitoring module and connect it in parallel to the two ends of the charging device, connect the single battery 1, single battery 2, ..., single battery n in the group to the single battery monitoring module 1, single battery monitoring module 2, ..., single battery monitoring module n in sequence; connect the detection end of the current transmitter to the group end loop of the battery pack, and connect the signal output end of the current transmitter to the signal input end of the group end filter module of the battery pack monitoring module; the AC output end of the AC simulation device is connected to the positive electrode of the battery pack and the ground respectively; the battery pack monitoring module is connected to the host computer through the group end communication module;

[0045] S14: The system is powered on, and the host computer sends the preset values ​​of the battery group terminal voltage, group terminal current and AC inrush voltage, as well as the voltage, internal resistance and temperature of the single battery to the battery group monitoring module; the battery group monitoring module receives the preset values ​​and determines whether the battery group terminal voltage, group terminal current, AC inrush voltage, and the voltage, internal resistance and temperature of the single battery are normal. If not, the battery group monitoring module is repaired and this step is repeated; if normal, the preset values ​​of the group terminal voltage, group terminal current and AC inrush voltage are changed and the charging equipment is disconnected. After the system has run for a period of time, it is checked whether the battery group monitoring module can normally send an undervoltage alarm If it cannot, repair the battery pack monitoring module and repeat this step; if it can, connect the charging equipment and increase the charging voltage, check whether the battery pack monitoring module can normally send the overcurrent alarm information, if it cannot, repair the battery pack monitoring module and repeat this step; if it can, change the preset values ​​of the voltage, temperature and internal resistance of the single battery, check whether the battery pack monitoring module can normally send the voltage, temperature and internal resistance alarm information of the single battery in the current state, if it cannot, repair the battery pack monitoring module and repeat this step; if it can, the protection indicators and test accuracy of the battery online status monitoring system meet the design requirements.

[0046] S2: Connect the battery pack to be tested to the battery pack monitoring module, and connect the single battery 1, single battery 2, ..., single battery n in the group to the single battery monitoring module 1, single battery monitoring module 2, ..., single battery monitoring module n in sequence;

[0047] S3: The single battery monitoring module n collects the voltage, temperature and internal resistance data of the single battery n and sends it to the battery pack monitoring module;

[0048] S4: The battery pack monitoring module collects the battery pack terminal voltage, terminal current and AC inrush voltage;

[0049] S5: The battery pack monitoring module receives and saves the preset values ​​of the voltage, temperature and internal resistance of the single battery n, as well as the preset values ​​of the group terminal voltage, group terminal current and AC inrush voltage of the battery pack sent by the host computer;

[0050] S6: The battery pack monitoring module compares the data obtained in step S3 and step S4 with the corresponding preset values ​​obtained in step S5. If the comparison result exceeds the preset value range, an audible and visual alarm is issued, and the data obtained in steps S3, S4 and S5 are packaged and sent to the host computer; if the comparison result does not exceed the preset value range, the cycle starts from step S3.

[0051] The present invention can not only independently form a network, but also adopts a precise control and early warning method for secondary maintenance safety risks based on a remote platform, which comprehensively records the online monitoring information historical data of the battery, including the charging and discharging status of the battery pack, the group terminal voltage, the charging and discharging current, the ambient temperature, the voltage of each single cell, the internal resistance, and the pole temperature, and records the entire life cycle of the battery; at the same time, it performs big data management and analysis, accurately predicts the status of the battery according to the horizontal and vertical intelligent comparison of the multivariable change trend of the battery, and performs real-time data analysis on the big data for preset alarms, faults, and dangerous points, warns of dangerous faults in advance, and pushes them to the mobile devices of the designated maintenance site in the form of text messages.

[0052] The above embodiments are only used to illustrate the design ideas and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The protection scope of the present invention is not limited to the above embodiments. Therefore, any equivalent changes or modifications made based on the principles and design ideas disclosed by the present invention are within the protection scope of the present invention.

Claims

1. A battery online status monitoring system, assuming that there are n single batteries to be monitored, n ≥ 1, characterized in that: It includes a single battery monitoring module 1, a single battery monitoring module 2, ..., a single battery monitoring module n for collecting data including internal resistance, voltage and temperature of a single battery, and a battery pack monitoring module for collecting data including group terminal voltage, group terminal current and AC inrush voltage of a battery pack, comparing the collected data with a preset value and outputting an alarm signal when the comparison result exceeds a preset range; The single battery monitoring module n includes a single sensor n, a single filter module n, a single control module n and a single communication module n, and the battery group monitoring module includes a group end sensor, a group end filter module, a group end control module, a group end communication module and a comparison module; The detection end of the single sensor n is connected to the single battery n, the signal output end of the single sensor n is connected to the signal input end of the single filter module n, the signal output end of the single filter module n is connected to the signal input end of the single control module n, the signal output end of the single control module n is connected to the signal input end of the single communication module n, and the signal output end of the single communication module n is connected to the signal input end of the group end communication module; The detection end of the group-end sensor is connected to the battery group, the signal output end of the group-end sensor is connected to the signal input end of the group-end filter module, the signal output end of the group-end filter module is connected to the signal input end of the group-end control module, and the signal transceiver end of the group-end control module is respectively connected to the signal transceiver end of the comparison module and the signal transceiver end of the group-end communication module; The monitoring method includes the following steps: S1: Check whether the protection index and test accuracy of the battery online status monitoring system meet the design requirements; if not, repair the battery online status monitoring system and repeat this step; if satisfied, execute step S2; S2: Connect the battery pack to be tested to the battery pack monitoring module, and connect the single battery 1, single battery 2, ..., single battery n in the group to the single battery monitoring module 1, single battery monitoring module 2, ..., single battery monitoring module n in sequence; S3: The single battery monitoring module n collects the voltage, temperature and internal resistance data of the single battery n and sends it to the battery pack monitoring module; S4: The battery pack monitoring module collects the battery pack terminal voltage, terminal current and AC inrush voltage; S5: The battery pack monitoring module receives and saves the preset values ​​of the voltage, temperature and internal resistance of the single battery n, as well as the preset values ​​of the group terminal voltage, group terminal current and AC inrush voltage of the battery pack sent by the host computer; S6: The battery pack monitoring module compares the data obtained in step S3 and step S4 with the corresponding preset values ​​obtained in step S5. If the comparison result exceeds the preset value range, an audible and visual alarm is issued, and the data obtained in step S3, step S4 and step S5 are packaged and sent to the host computer; if the comparison result does not exceed the preset value range, the cycle starts from step S3; In the step S1, the specific steps are: S11: Perform reliability tests including withstand voltage and surge protection on the battery online status monitoring system respectively; if the design requirements are not met, repair the battery online status monitoring system and repeat this step; if the design requirements are met, execute step S12; S12: Select 5 to 10 single batteries from a group of batteries and connect them to corresponding single battery monitoring modules, and collect the voltage, temperature and internal resistance of each single battery respectively; Use an independent test tool to measure the voltage, temperature and internal resistance of each single battery respectively; compare the data measured by the test tool with the data uploaded by the corresponding single battery monitoring module. If the error exceeds the preset value range, repair or replace the single battery monitoring module and repeat this step; if the error is within the preset value range, continue testing until the measurement errors of all single battery monitoring modules are within the preset value range, and the parameter changes of the single battery before and after the test are within the preset value range, then it is considered that the single battery monitoring module meets the design requirements; if the parameter changes of the tested single battery before and after the test exceed the preset value range, replace the single battery and the corresponding single battery monitoring module and re-execute this step; S13: Connect the battery pack to the battery pack monitoring module and connect it in parallel to the two ends of the charging device, and connect the single battery 1, single battery 2, ..., single battery n in the group to the single battery monitoring module 1, single battery monitoring module 2, ..., single battery monitoring module n in sequence; connect the detection end of the current transmitter to the group end loop of the battery pack, and connect the signal output end of the current transmitter to the signal input end of the group end filter module of the battery pack monitoring module; the AC output end of the AC simulation device is connected to the positive electrode of the battery pack and the ground respectively; the battery pack monitoring module is connected to the host computer through the group end communication module; S14: The system is powered on, and the host computer sends the preset values ​​of the battery group terminal voltage, group terminal current and AC inrush voltage, as well as the voltage, internal resistance and temperature of the single battery to the battery group monitoring module; the battery group monitoring module receives the preset values ​​and determines whether the battery group terminal voltage, group terminal current, AC inrush voltage, and the voltage, internal resistance and temperature of the single battery are normal. If not, the battery group monitoring module is repaired and this step is repeated; if normal, the preset values ​​of the group terminal voltage, group terminal current and AC inrush voltage are changed and the charging equipment is disconnected. After the system has run for a period of time, it is checked whether the battery group monitoring module can normally send an undervoltage alarm If it cannot, repair the battery pack monitoring module and repeat this step; if it can, connect the charging equipment and increase the charging voltage, check whether the battery pack monitoring module can normally send the overcurrent alarm information, if it cannot, repair the battery pack monitoring module and repeat this step; if it can, change the preset values ​​of the voltage, temperature and internal resistance of the single battery, check whether the battery pack monitoring module can normally send the voltage, temperature and internal resistance alarm information of the single battery in the current state, if it cannot, repair the battery pack monitoring module and repeat this step; if it can, the protection indicators and test accuracy of the battery online status monitoring system meet the design requirements.

2. A battery online status monitoring system according to claim 1, characterized in that: The single cell sensor n comprises an internal resistance tester n, a single cell voltmeter n and a single cell temperature sensor n; the test end of the internal resistance tester n is connected in parallel with the charge and discharge end of the single cell storage battery n, the test end of the single cell voltmeter n is connected in parallel with the charge and discharge end of the single cell storage battery n, and the detection end of the single cell temperature sensor n is in close contact with the outer surface of the single cell storage battery n.

3. A battery online status monitoring system according to claim 1, characterized in that: The group-end sensor includes a group-end voltmeter, a group-end ammeter and an ambient temperature sensor; the group-end voltmeter is connected in parallel with the output end of the battery pack, the group-end ammeter is connected in series in the output circuit of the battery pack, and the ambient temperature sensor is arranged on the outside of the outer casing of the battery pack; the battery pack monitoring module also includes an AC simulation device for simulating AC inrush voltage, and the AC output end of the AC simulation device is respectively connected to the positive output terminal of the battery pack and the ground.

4. A battery online status monitoring system according to claim 1, characterized in that: The battery pack monitoring module also includes a storage module for storing received information, and a signal transceiver end of the storage module is connected to a signal transceiver end of the group end communication module.

5. A battery online status monitoring system according to claim 1, characterized in that: The battery pack monitoring module also includes an input module for converting user operations into electrical signals and sending them to the group-end control module, and an output module for displaying the received information to the user. The input module includes buttons, knobs and a keyboard, and the signal input ends of the buttons, knobs and keyboard are respectively connected to the signal output ends of the group-end control module; the output module includes a display module and an audible and visual alarm, and the signal input end of the display module is connected to the signal output end of the group-end control module, and the switch of the audible and visual alarm is connected to the alarm dry contact of the group-end control module.

6. A battery online status monitoring system according to claim 1, characterized in that: The battery pack monitoring module also includes a network module, a wireless module and a text message module. The signal transceiver ends of the network module and the wireless module are respectively connected to the signal transceiver end of the group end communication module, and the signal input end of the text message module is connected to the signal output end of the group end communication module.

7. A battery online status monitoring system according to claim 6, characterized in that: It also includes a remote platform and a mobile device for receiving and analyzing information output by the battery group monitoring module and sending control commands to the battery group monitoring module; the remote platform is connected to the group end communication module through the network module; the mobile device is connected to the group end communication module through the wireless module and the SMS module respectively.

8. The battery online status monitoring system according to claim 1, characterized in that: It also includes a power module and a protection module for providing overcurrent protection for the system. The power output end of the power module is connected to the power input end of the system, and the protection module is connected in series in the power loop.

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