CN111722124A - A kind of battery online state monitoring system and monitoring method - Google Patents

Abstract

The invention provides an on-line state monitoring system for a battery, including a single battery monitoring module, a battery pack monitoring module, a remote platform, a mobile device, a power supply module and a protection module, each single battery detection module corresponding to a single battery. The invention also provides a monitoring method based on the battery on-line state monitoring system, by collecting the operating states of the battery pack and battery cells, including the group terminal voltage, current, AC intrusion voltage and cell voltage, temperature, and internal resistance parameters , to achieve online real-time monitoring of battery packs; alarms for general out-of-limit faults by setting thresholds, and real-time feedback of abnormal information to the upper computer to improve the stability of system operation, avoid accidents, and replace manual regular inspections. Reduced maintenance costs.

Description

A kind of battery online state monitoring system and monitoring method

technical field

The invention belongs to the technical field of battery monitoring, and in particular relates to a battery online state monitoring system and a monitoring method.

Background technique

As an important power source for the DC power supply system of power plants, substations and converter stations, the battery pack is the only device that supplies power to the DC system in the power system and communication system. Its performance is directly related to the safety of the power system and communication system. Reliability, its power supply capacity is the final guarantee for the stable operation of the plant and station equipment. The reliability of the battery pack 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 the capacity it releases during the actual discharge process are of great significance to ensure the normal operation of power equipment.

In recent years, there have been many open-circuit faults of batteries in the domestic power system, resulting in protection refusal, overstep tripping accidents in substations, and even large-scale power outages; short-circuit faults of batteries lead to burning of battery packs; batteries and DC busbars have also occurred. The voltage loss accident caused the serious consequences of the main substation burning; therefore, the regular monitoring of the battery is a very necessary and important link that cannot be ignored.

The life of the battery is directly related to the floating charging operation mode and operating temperature. The battery with problems usually shows an increase in internal resistance. Therefore, real-time online monitoring of the battery, timely identification and processing of the faulty single battery, can effectively improve the battery pack. service life. However, the 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 status of the battery in real time and comprehensively.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide an on-line state monitoring system and a monitoring method for a battery, which are used to realize the functions of monitoring the state of the battery in real time and outputting monitoring information.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: an on-line state monitoring system for a battery, wherein there are n single batteries to be monitored, n ≥ 1, including an internal resistance, a voltage for collecting a single battery Single battery monitoring module 1, single battery monitoring module 2, . , a battery pack monitoring module that compares the collected data with a preset value and outputs an alarm signal when the comparison result exceeds the preset range; the single battery monitoring module n includes a single cell sensor n, a single cell filter module n, and a single cell control module n and the cell communication module n, the battery pack 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 cell sensor n is connected to the single battery n, and the single The signal output end of the body sensor n is connected with the signal input end of the single filter module n, the signal output end of the single filter module n is connected with the signal input end of the single control module n, and the signal output end of the single control module n is connected to the signal input end of the single control module n. The signal input end of the single communication module n is connected, the signal output end of the single communication module n is connected with the signal input end of the group end communication module; the detection end of the group end sensor is connected with the battery pack, and the signal output end of the group end sensor is connected with the signal input end of the group end communication module. The signal input end of the group end filter module is connected, the signal output end of the group end filter module is connected with the signal input end of the group end control module, the signal transceiver end of the group end control module is respectively connected with the signal transceiver end of the comparison module and the group end communication module signal transceiver connection.

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

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 set at Outside the shell of the battery pack; the battery pack monitoring module also includes an AC simulation device for simulating the AC break-in 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.

According to the above solution, the battery pack monitoring module further includes a storage module for storing received information, and the signal transceiver terminal of the storage module is connected to the signal transceiver terminal of the group-side communication module.

According to the above solution, the battery pack monitoring module also includes an input module for converting user operations into electrical signals and sending them to the pack-end control module and an output module for displaying the received information to the user, the input module includes buttons, knobs and keyboards , the signal input ends of the button, knob and keyboard are respectively connected with the signal output end of the group end control module; the output module includes a display module and a sound and light alarm, and the signal input end of the display module is connected with the signal output end of the group end control module, The switch of the sound and light alarm is connected with the alarm dry contact of the group end control module.

According to the above scheme, the battery pack monitoring module further includes a network module, a wireless module and a short message module, the signal transceiver ends of the network module and the wireless module are respectively connected with the signal transceiver end of the group end communication module, and the signal input end of the short message module communicates with the group end The signal output of the module is connected.

Further, it also includes a remote platform and a mobile device for receiving and analyzing the information output by the battery pack monitoring module and sending control commands to the battery pack monitoring module; the remote platform is connected with the group-end communication module through the network module; The module and the short message module are connected with the group-end communication module.

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 terminal of the power module is connected to the power input terminal of the system, and the protection module is connected in series in the power circuit.

An on-line state monitoring method for a battery, comprising the following steps:

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

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

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 pack terminal voltage, pack terminal current and AC intrusion voltage of the battery pack;

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

S6: The battery pack monitoring module compares the data obtained in steps S3 and S4 with the corresponding preset values obtained in step S5 respectively, and if the comparison result exceeds the preset value range, an audible and visual alarm is performed, and steps S3 and S4 Packing with the data obtained in step S5 and sending it to the upper computer; if the comparison result does not exceed the preset value range, the cycle starts from step S3.

Further, in the described step S1, the specific steps are:

S11: respectively conduct reliability tests including withstand voltage and surge protection on the battery on-line state monitoring system; if the design requirements are not met, repair the battery on-line state monitoring system and repeat this step; if the design requirements are met, execute step S12;

S12: Select 5 to 10 single batteries in a group of batteries to connect to the corresponding single battery monitoring module and collect the voltage, temperature and internal resistance of each single battery respectively; use an independent test tool to measure each single battery separately. Check the voltage, temperature and internal resistance of the battery; 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 operation. Step: if the error is within the preset value range, continue the test until the measurement errors of all the 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 change of the single battery under test before and after the test exceeds the preset value range, replace the single battery and the corresponding single battery monitoring module and perform this step again;

S13: Connect the battery pack to the battery pack monitoring module and connect it to both ends of the charging device in parallel, 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; connect the detection end of the current transmitter to the group end loop of the battery pack, and the signal output end of the current transmitter to the group end filter of the battery pack monitoring module The signal input end of the module; the AC output end of the AC analog device is respectively connected to the positive pole and the ground of the battery pack; the battery pack monitoring module is connected to the host computer through the group end communication module;

S14: When the system is powered on, the host computer sends the battery pack terminal voltage, pack terminal current and AC inrush voltage, as well as the preset values of the voltage, internal resistance and temperature of the single battery to the battery pack monitoring module; the battery pack monitoring module receives Preset the value and judge whether the battery pack terminal voltage, pack terminal current, AC break-in voltage, and the voltage, internal resistance and temperature of the single battery are normal. If they are not normal, repair the battery pack monitoring module and repeat this step; if normal Then change the preset value of group terminal voltage, group terminal current and AC break-in voltage and disconnect the charging equipment. After the system runs for a period of time, check whether the battery monitoring module can send undervoltage alarm information and overvoltage alarm information normally. Then repair the battery pack monitoring module and repeat this step; if possible, connect the charging equipment and increase the charging voltage, check whether the battery pack monitoring module can send overcurrent alarm information normally, if not, repair the battery pack monitoring module and repeat this step; If possible, change the preset values of 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 not, repair the battery pack monitoring module and repeat this step; if possible, the protection index and test accuracy of the battery online state monitoring system meet the design requirements.

The beneficial effects of the present invention are:

1. A battery online state monitoring system of the present invention realizes real-time monitoring by monitoring, saving and uploading the voltage, internal resistance, and temperature of the single battery, as well as the terminal voltage and terminal current of the battery pack, and alarming according to the set threshold. The function of monitoring the state of the battery and outputting monitoring information overcomes the shortcomings of the existing static, offline and intermittent battery monitoring systems.

2. The monitoring method of the present invention analyzes the capacity data of the battery by automatically monitoring the collection data of the battery pack and the big data network, the monitoring results are comprehensive and effective, and the situation of insufficient capacity of the battery can be found in time, especially the open circuit and short circuit faults of the battery, And replace it in time to eliminate potential safety hazards, prevent the accident of refusal to operate the protection equipment due to battery failure, effectively provide the accident discharge capacity of the battery, give full play to the backup role of the battery, and ensure the safety of the power grid to the greatest extent.

3. The present invention is simple to operate, replaces the traditional manual periodic inspection operation, reduces the labor intensity of operation and maintenance personnel, and improves work quality and efficiency.

Description of drawings

FIG. 1 is a functional block diagram of an embodiment of the present invention.

FIG. 2 is a monitoring flow chart of an embodiment of the present invention.

FIG. 3 is a flow chart of the verification of the system according to the embodiment of the present invention.

FIG. 4 is a test connection diagram of a single battery monitoring module according to an embodiment of the present invention.

FIG. 5 is a check connection diagram of a battery pack monitoring module according to an embodiment of the present invention.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Referring to FIG. 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 Module n, battery pack monitoring module, remote platform, mobile device, power supply module and 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; the battery pack monitoring module is used to collect the battery pack terminal voltage, pack terminal current, and AC break-in voltage data, compare the collected data with the preset value, and output an alarm signal when the comparison result exceeds the preset range. At the same time, sound and light alarms are carried out, and the state quantity and alarm information are packaged and uploaded to the host computer; the remote platform is used to receive and analyze the information output by the battery pack monitoring module and send control commands to the battery pack monitoring module; mobile devices are used for portable control systems ; The power module is used to supply power to the system; the protection module is used to provide surge protection for the system.

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; the single sensor n includes an internal resistance tester n, a single voltmeter n and a single temperature Sensor n; the test terminal of the internal resistance tester n is connected in parallel with the charging and discharging terminal of the single battery n, the test terminal of the single voltmeter n is connected in parallel with the charging and discharging terminal of the single battery n, and the detection terminal of the single temperature sensor n is tightly connected. Paste the outer surface of the single battery n; the signal output terminals of the internal resistance tester n, the single voltmeter n and the single temperature sensor n are respectively connected with the signal input terminal of the single filter module n, and the signal of the single filter module n The output terminal is connected with the signal input terminal of the single control module n, the signal output terminal of the single control module n is connected with the signal input terminal of the single communication module n, and the signal output terminal of the single communication module n is connected with the signal input terminal of the battery pack monitoring module. The signal input terminal of the group-end communication module is connected.

The battery pack monitoring module includes a pack end sensor, an AC analog device, a pack end filter module, a pack end control module, a pack end communication module, a comparison module, a storage module, an input module, an output module, a network module, a wireless module and a short message module, among which The AC analog device is used to simulate the AC break-in 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 value and output the comparison. As a result, the input module is used to convert the user operation into an electrical signal and send it to the group-side control module, and the output module is used to convert the received internal resistance, voltage and temperature of the single battery, group-side voltage and group-side current of the battery pack. And the ambient temperature information is displayed to the user in real time, and an alarm prompt is given according to the preset value, which is used to detect the battery fault in time and give an early warning according to the 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 loop of the battery pack, and the ambient temperature sensor is set Outside the casing of the battery pack; the signal output terminal 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 output end of the group end control module is connected. The transceiver end is respectively connected with 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 analog device is respectively connected to the battery The positive pole and the ground of the group; the input module includes buttons, knobs and a keyboard, and the signal output ends of the buttons, knobs and keyboards are respectively connected with the signal input ends of the group end control module; the output module includes a display module and a sound and light alarm; The signal input terminal is connected to the signal output terminal of the group-side control module, and the display module displays the received data in the form of tables, histograms, and trend graphs, and provides a historical data viewing function when the user queries; group-side control The module includes at least one alarm dry contact, and the switch of the sound and light 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 end of the group-end communication module, and the signal of the short message module is connected. The input end is connected with the signal output end of the group end communication module.

The remote platform is connected with the group-end communication module through the network module, and the mobile device is connected with the group-end communication module through the wireless module and the short message module respectively; the power output end of the power module is connected with the power input end of the system, and the protection module is connected in series in the power circuit.

Referring to Fig. 2, a method for monitoring the online state of a battery includes the following steps:

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

S11: Referring to Figure 3, carry out reliability tests including withstand voltage and surge protection for the battery on-line condition monitoring system respectively; if the design requirements are not met, repair the battery on-line condition monitoring system and repeat this step; if the design requirements are met, then Execute step S12;

S12: Referring to Figure 4, select 5 to 10 single batteries in a group of batteries to connect to the corresponding single battery monitoring module and collect the voltage, temperature and internal resistance of each single battery respectively; Measure the voltage, temperature and internal resistance of each single battery; 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 the test 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. If the parameter change of the single battery under test before and after the test exceeds the preset value range, replace the single battery and the corresponding single battery monitoring module and re-install the perform this step;

S13: Referring to Figure 5, connect the battery pack to the battery pack monitoring module and connect it in parallel to both ends of the charging device, and connect the single battery 1, single battery 2, ..., single battery n in the group to the single battery in sequence Monitoring module 1, single battery monitoring module 2, ..., single battery monitoring module n; the detection end of the current transmitter is connected to the group end loop of the battery pack, and the signal output end of the current transmitter is connected to the battery pack monitoring module The signal input end of the filter module at the group end; the AC output end of the AC analog device is respectively connected to the positive pole and the ground of the battery pack; the battery pack monitoring module is connected to the host computer through the group end communication module;

S14: When the system is powered on, the host computer sends the battery pack terminal voltage, pack terminal current and AC inrush voltage, as well as the preset values of the voltage, internal resistance and temperature of the single battery to the battery pack monitoring module; the battery pack monitoring module receives Preset the value and judge whether the battery pack terminal voltage, pack terminal current, AC break-in voltage, and the voltage, internal resistance and temperature of the single battery are normal. If they are not normal, repair the battery pack monitoring module and repeat this step; if normal Then change the preset value of group terminal voltage, group terminal current and AC break-in voltage and disconnect the charging equipment. After the system runs for a period of time, check whether the battery monitoring module can send undervoltage alarm information and overvoltage alarm information normally. Then repair the battery pack monitoring module and repeat this step; if possible, connect the charging equipment and increase the charging voltage, check whether the battery pack monitoring module can send overcurrent alarm information normally, if not, repair the battery pack monitoring module and repeat this step; If possible, change the preset values of 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 not, repair the battery pack monitoring module and repeat this step; if possible, the protection index and test accuracy of the battery online state monitoring system meet the design requirements.

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

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 pack terminal voltage, pack terminal current and AC intrusion voltage of the battery pack;

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

S6: The battery pack monitoring module compares the data obtained in steps S3 and S4 with the corresponding preset values obtained in step S5 respectively, and if the comparison result exceeds the preset value range, an audible and visual alarm is performed, and steps S3 and S4 Packing with the data obtained in step S5 and sending it to the upper computer; if the comparison result does not exceed the preset value range, the cycle starts from step S3.

The invention can not only form a network independently, but also adopts a remote platform-based secondary maintenance safety risk precise control and early warning method, and comprehensively records the charging and discharging status of the battery, including the battery pack charge and discharge status, pack terminal voltage, charge and discharge current, ambient temperature, and each unit The historical data of online monitoring information of the battery voltage, internal resistance, and pole temperature records the full life cycle of the battery; at the same time, the big data management analysis is carried out, and the state of the battery is accurately predicted according to the horizontal and vertical intelligent comparison of the multi-variable change trend of the battery. For preset alarms, faults, and dangerous points, real-time data analysis is performed on big data, early warning of dangerous faults, and pushes to mobile devices at designated maintenance sites by SMS.

The above embodiments are only used to illustrate the design ideas and features of the present invention, and the purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes or modifications made according to the principles and design ideas disclosed in the present invention fall within the protection scope of the present invention.

Claims (10)

1. The utility model provides a battery on-line status monitoring system, establishes that the monomer battery who treats monitoring has n, and n is greater than or equal to 1, its characterized in that: the monitoring system comprises a single storage battery monitoring module 1, a single storage battery monitoring module 2, … and a single storage battery monitoring module n, wherein the single storage battery monitoring module 1 is used for acquiring data including internal resistance, voltage and temperature of a single storage battery, and the storage battery monitoring module n is used for acquiring data including group end voltage, group end current and alternating current fleeing voltage of a storage battery, comparing the acquired data with a preset value and outputting an alarm signal when the comparison result exceeds a preset range;

the single storage battery monitoring module n comprises a single sensor n, a single filtering module n, a single control module n and a single communication module n, and the storage battery monitoring module comprises a group end sensor, a group end filtering 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 with the single storage battery n, the signal output end of the single sensor n is connected with the signal input end of the single filtering module n, the signal output end of the single filtering module n is connected with the signal input end of the single control module n, the signal output end of the single control module n is connected with the signal input end of the single communication module n, and the signal output end of the single communication module n is connected with the signal input end of the group end communication module;

the detection end of the group end sensor is connected with the storage battery, the signal output end of the group end sensor is connected with the signal input end of the group end filtering module, the signal output end of the group end filtering module is connected with the signal input end of the group end control module, and the signal transceiving end of the group end control module is respectively connected with the signal transceiving end of the comparison module and the signal transceiving end of the group end communication module.

2. The system for monitoring the online state of the storage battery according to claim 1, characterized in that: the monomer sensor n comprises an internal resistance tester n, a monomer voltmeter n and a monomer temperature sensor n; the testing end of the internal resistance tester n is connected with the charging and discharging end of the single storage battery n in parallel, the testing end of the single voltmeter n is connected with the charging and discharging end of the single storage battery n in parallel, and the detecting end of the single temperature sensor n is tightly attached to the outer surface of the single storage battery n.

3. The system for monitoring the online state of the storage battery according to claim 1, characterized in that: the group end sensor comprises a group end voltmeter, a group end ammeter and an environment temperature sensor; the group end voltmeter is connected with the output end of the storage battery in parallel, the group end voltmeter is connected in series in an output loop of the storage battery, and the environment temperature sensor is arranged outside the shell of the storage battery; the storage battery pack monitoring module further comprises alternating current simulation equipment for simulating alternating current entering voltage, and an alternating current output end of the alternating current simulation equipment is respectively connected with the positive electrode of the output end of the storage battery pack and the ground.

4. The system for monitoring the online state of the storage battery according to claim 1, characterized in that: the storage battery pack monitoring module also comprises a storage module used for storing the received information, and a signal receiving and transmitting end of the storage module is connected with a signal receiving and transmitting end of the pack end communication module.

5. The system for monitoring the online state of the storage battery according to claim 1, characterized in that: the storage battery pack monitoring module also comprises an input module and an output module, wherein the input module is used for converting user operation into an electric signal and sending the electric signal to the pack end control module, the output module is used for displaying received information to a user, the input module comprises a button, a knob and a keyboard, and the signal input ends of the button, the knob and the keyboard are respectively connected with the signal output end of the pack end control module; the output module comprises a display module and an audible and visual alarm, the signal input end of the display module is connected with the signal output end of the group end control module, and the switch of the audible and visual alarm is connected with the alarm main contact of the group end control module.

6. The system for monitoring the online state of the storage battery according to claim 1, characterized in that: the storage battery monitoring module further comprises a network module, a wireless module and a short message module, wherein the signal receiving and transmitting ends of the network module and the wireless module are respectively connected with the signal receiving and transmitting end of the group end communication module, and the signal input end of the short message module is connected with the signal output end of the group end communication module.

7. The system for monitoring the online state of the storage battery according to claim 6, wherein: the remote platform and the mobile equipment are used for receiving and analyzing information output by the storage battery pack monitoring module and sending a control command to the storage battery pack monitoring module; the remote platform is connected with the group end communication module through a network module; the mobile equipment is connected with the group end communication module through the wireless module and the short message module respectively.

8. The system for monitoring the online state of the storage battery according to claim 1, characterized in that: the protection circuit also comprises a power supply module and a protection module used for providing overcurrent protection for the system, wherein the power supply output end of the power supply module is connected with the power supply input end of the system, and the protection module is connected in series in the power supply loop.

9. The monitoring method of the storage battery online state monitoring system according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:

s1: checking whether the protection index and the test precision of the storage battery online state monitoring system meet the design requirements or not; if not, maintaining the storage battery online state monitoring system and repeatedly executing the step; if yes, go to step S2;

s2: the storage battery pack to be tested is connected into a storage battery pack monitoring module, and a single storage battery 1, a single storage battery 2, … and a single storage battery n in the group are sequentially connected into the single storage battery monitoring module 1, the single storage battery monitoring module 2, … and the single storage battery monitoring module n;

s3: the single storage battery monitoring module n collects voltage, temperature and internal resistance data of the single storage battery n and sends the data to the storage battery monitoring module;

s4: the storage battery pack monitoring module acquires a pack end voltage, a pack end current and an alternating current entering voltage of the storage battery pack;

s5: the storage battery pack monitoring module receives and stores preset values of voltage, temperature and internal resistance of the single storage battery n sent by the upper computer, and preset values of pack end voltage, pack end current and alternating current entering voltage of the storage battery pack;

s6: the storage battery pack monitoring module compares the data obtained in the step S3 and the step S4 with corresponding preset values obtained in the step S5 respectively, and if the comparison result exceeds the range of the preset values, audible and visual alarms are carried out, and the data obtained in the step S3, the step S4 and the step S5 are packaged and sent to an upper computer; if the comparison result does not exceed the preset value range, the loop is started from step S3.

10. The monitoring method according to claim 9, wherein: in the step S1, the specific steps are as follows:

s11: respectively carrying out reliability tests including withstand voltage and surge protection on the storage battery online state monitoring system; if the design requirement is not met, maintaining the storage battery online state monitoring system and repeatedly executing the step; if yes, executing step S12;

s12: selecting 5-10 single storage batteries from a group of storage batteries, connecting the selected single storage batteries to corresponding single storage battery monitoring modules, and respectively collecting the voltage, the temperature and the internal resistance of each single storage battery; respectively measuring the voltage, the temperature and the internal resistance of each single storage battery by using an independent testing tool; comparing the data measured by the testing tool with the data uploaded by the corresponding single storage battery monitoring module, if the error exceeds the preset value range, maintaining or replacing the single storage battery monitoring module and repeatedly executing the step; if the error is within the preset value range, continuing the test until the measurement errors of all the single storage battery monitoring modules are within the preset value range and the parameter change of the single storage battery before and after the test is within the preset value range, and determining that the single storage battery monitoring modules meet the design requirements; if the parameter change of the single storage battery before and after the test exceeds the preset value range, replacing the single storage battery and the corresponding single storage battery monitoring module and re-executing the step;

s13: connecting a storage battery pack to a storage battery pack monitoring module and connecting the storage battery pack to two ends of charging equipment in parallel, and sequentially connecting a single storage battery 1, a single storage battery 2, … and a single storage battery n in the group to the single storage battery monitoring module 1, the single storage battery monitoring modules 2, … and the single storage battery monitoring module n; the detection end of the current transmitter is connected to a group end loop of the storage battery pack, and the signal output end of the current transmitter is connected with the signal input end of a group end filtering module of the storage battery pack monitoring module; the alternating current output end of the alternating current simulation equipment is respectively connected with the anode of the storage battery pack and the ground; the storage battery pack monitoring module is connected with the upper computer through the pack end communication module;

s14: the system is powered on, and the upper computer sends the group end voltage, the group end current and the alternating current entering voltage of the storage battery pack and preset values of the voltage, the internal resistance and the temperature of the single storage battery to the storage battery pack monitoring module; the storage battery pack monitoring module receives the preset value and respectively judges whether the pack end voltage, the pack end current and the alternating current entering voltage of the storage battery and the voltage, the internal resistance and the temperature of the single storage battery are normal or not, and if the voltage, the internal resistance and the temperature of the single storage battery are not normal, the storage battery pack monitoring module is maintained and the step is repeated; if the voltage of the battery pack end is normal, changing preset values of the voltage of the battery pack end, the current of the battery pack end and the alternating current entering voltage, disconnecting the charging equipment, checking whether the monitoring module of the storage battery pack can normally send undervoltage alarm information and overvoltage alarm information after the system runs for a period of time, and if not, maintaining the monitoring module of the storage battery pack and repeating the steps; if the overcurrent alarm information can not be sent normally, the storage battery monitoring module is maintained and the step is repeated; if the preset values of the voltage, the temperature and the internal resistance of the single storage battery can be changed, whether the monitoring module of the storage battery pack can normally send the voltage, the temperature and the internal resistance warning information of the single storage battery in the current state is checked, and if the preset values cannot be changed, the monitoring module of the storage battery pack is maintained and the step is repeated; if so, the protection index and the test precision of the storage battery online state monitoring system meet the design requirement.

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