An intelligent instrument system based on Internet of Things modules and online monitoring

By installing an IoT smart instrument system on the electrolyte packaging barrels to monitor temperature and pressure in real time, the problem of electrolyte packaging barrels being unable to be monitored in real time is solved, efficient real-time data updates and rapid positioning are achieved, and the safety of the transportation process is ensured.

CN116576910BActive Publication Date: 2025-10-03NINGBO GLOBAL INTELLIGENT IND CO LTD
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Patent Information

Application Number
CN202310412586.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-10
Publication Date
2025-10-03
Estimated Expiration
2043-04-10

AI Technical Summary

Technical Problem

In the existing technology, the temperature and pressure values ​​of the electrolyte packaging barrel cannot be monitored in real time. Personnel need to go to the location of the barrel to read the data. The real-time performance is poor and there are cases where manual reading is impossible, which makes it impossible to quickly respond to leaks or temperature abnormalities.

Method used

An intelligent instrument system based on the Internet of Things module and online monitoring is installed on the battery electrolyte packaging barrel. It includes a thermometer and a pressure gauge. It monitors temperature and pressure data in real time through a wireless transmission device, and updates and locates data through RFID and PDA readers. It also uses a load-bearing sensor to determine the position and status of the packaging barrel.

Benefits of technology

Real-time monitoring of the temperature and pressure of electrolyte packaging barrels is achieved, which improves the real-time and accuracy of monitoring, can quickly locate accident packaging barrels, avoid misjudgment, increase the frequency of data reporting, and ensure the safety of the transportation process.

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Abstract

The present invention relates to an intelligent instrument system based on an Internet of Things module and online monitoring, characterized in that: an intelligent instrument (2) is installed on one or more battery electrolyte packaging barrels (1), the intelligent instrument including a thermometer and a pressure gauge, the thermometer monitoring the temperature value of the electrolyte, the pressure gauge monitoring the pressure value of the electrolyte in the packaging barrel (1), and the data output by the thermometer and the pressure gauge are sent to a mobile terminal or a data server via a wireless transmission device, thereby monitoring in real time whether the temperature and pressure of the battery electrolyte in the packaging barrel (1) are normal. The present invention uses an intelligent instrument with a wireless remote transmission function to replace an ordinary instrument, and builds a data receiving server to receive the detection results from the intelligent instrument installed on the packaging barrel, so that production managers can remotely monitor the relevant information of all packaging barrels in real time with higher accuracy.
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Description

Technical Field

[0001] The present invention relates to an intelligent instrument system based on an Internet of Things module and online monitoring. Background Art

[0002] With the advancement of lithium battery technology, the quality control of electrolyte production is becoming increasingly strict.

[0003] Currently, major manufacturers have strict requirements for electrolyte temperature and pressure during production and transportation. Due to the unique characteristics of some electrolytes, exposure to air can cause deterioration or chemical changes, resulting in significant economic losses. Some electrolytes can also become unusable if their temperature exceeds 10°C, causing significant economic losses. Providing positioning functionality facilitates asset management.

[0004] Conventional pressure and temperature gauges were previously used for testing, requiring personnel to visit the barrels to read the data. This not only lacked real-time performance but also created situations where manual reading was impossible, such as when barrels were stacked in a warehouse during transportation or when barrels were stored in a three-dimensional warehouse. If a barrel leaked, the insulation and pressure levels would not be maintained as expected, preventing a quick response and preventive measures. Summary of the Invention

[0005] This invention designs an intelligent instrument system based on an Internet of Things module and online monitoring. The technical problem it solves is that the temperature and pressure values ​​of electrolyte packaging barrels cannot be monitored in real time in the existing technology. Personnel are required to go to the barrel location to read the data. This not only has poor real-time performance but also may be impossible to read manually.

[0006] In order to solve the above-mentioned technical problems, the present invention adopts the following solutions:

[0007] An intelligent instrument system based on an Internet of Things module and online monitoring is installed on one or more battery electrolyte packaging barrels. The intelligent instrument includes a thermometer and a pressure gauge. The thermometer monitors the temperature of the electrolyte, and the pressure gauge monitors the pressure of the electrolyte in the packaging barrel. The data output by the thermometer and pressure gauge are sent to a mobile terminal or a data server via a wireless transmission device, thereby monitoring in real time whether the temperature and pressure of the battery electrolyte in the packaging barrel are normal.

[0008] Preferably, the wireless transmission device includes RFID, which includes an electronic tag and a PDA reader / writer. The electronic tag supports reading and writing functions, and the temperature value or pressure value information output by the thermometer or pressure gauge can be updated at any time. The electronic tag and the PDA reader / writer are spatially coupled to each other through a coupling element to achieve radio frequency signal coupling; within the coupling channel, energy transfer and data exchange are achieved according to the timing relationship.

[0009] Preferably, the smart meter is equipped with a positioning device, which can determine the status of the packaging barrel bound to the smart meter based on the positioning and send the status to the mobile terminal or data server through its own wireless transmission device.

[0010] Preferably, the data transmission is compatible with the MQTT protocol and the TCP protocol, and the setting parameters of the smart meter can be modified by sending down the data server.

[0011] Preferably, a high frequency of data changes output by the positioning device indicates that the packaging barrel is in continuous movement, and the frequency of sending the temperature or pressure value output by the thermometer or pressure gauge to the electronic tag is increased, and the data update speed of the mobile terminal or data server is also increased; otherwise, the sending frequency is reduced.

[0012] Preferably, after the smart meter is installed on the packaging barrel, the employee needs to hold a scanning device and scan the barrel number and the IEMI code of the smart meter one by one. After the scanning is completed and submitted to the data receiving server, the smart meter system considers that the smart meter is bound to the scanned barrel number.

[0013] Preferably, each smart meter will periodically send a data packet to the data server after being powered on. The data packet includes its own IMEI number and the detection results of the sensors it carries.

[0014] Preferably, it also includes a load-bearing sensor, which monitors the weight of each packaging barrel and the electrolyte therein. After the electrolyte in the packaging barrel is used up, the pressure value output by the pressure sensor will decrease. The data server or mobile terminal will correct the pressure value according to the weight value output by the load-bearing sensor through the wireless transmission device to avoid the misjudgment of leakage in the packaging barrel due to the decrease in pressure value.

[0015] Preferably, when multiple packaging barrels are stacked, the value output by the load-bearing sensor of each packaging barrel will change from large to small, with the largest value indicating that it is located at the bottom layer and the smallest value indicating that it is located at the top layer. The mobile terminal or data server can determine the layer number of the corresponding packaging barrel based on the different values, so that when an accident occurs to the packaging barrel, the data server or mobile terminal can quickly determine the layer number based on the weight value output by the load-bearing sensor through the wireless transmission device.

[0016] A method for constructing an intelligent instrument system based on an Internet of Things module and online monitoring includes the following steps:

[0017] Step 1: Connect an RFID tag to the battery electrolyte packaging barrel, write the relevant information of the packaging barrel into the RFID tag through a PDA reader / writer, and then install the temperature gauge and pressure gauge on the packaging barrel. After the temperature gauge and pressure gauge are installed, the pressure sensor and temperature sensor will automatically work.

[0018] Step 2: Scan the QR code of the temperature gauge and pressure gauge with a PDA reader. The smart meter will then send temperature, pressure, battery capacity, time, and positioning data at a sampling interval of N minutes and a transmission interval of M minutes. Log in to a mobile terminal or data server platform to query the above information for the corresponding barrel number; query the relevant information of the packaging barrel and view the smart meter data online. N and M are positive numbers.

[0019] Step 3: When the packaging barrel is removed and filled with electrolyte, the PDA reader is operated to change the production status of the current barrel to filling and shipment. At this time, the mobile terminal or data server platform can observe that the status of the packaging barrel is being shipped based on the positioning device, and the uploaded air pressure and temperature data are updated every T hours. A high frequency of data changes output by the positioning device indicates that the packaging barrel is continuously moving. The frequency of sending the temperature or pressure values ​​output by the thermometer or pressure gauge to the electronic tag is increased, and the data update speed of the mobile terminal or data server is also increased. Conversely, the sending frequency is reduced, and T is a positive number.

[0020] Step 4: The customer observes the data output by the smart meter in real time during use;

[0021] During transportation and use, the default setting range of the safety air pressure is 20-50kPa. When the air pressure is lower than 20kPa or higher than 50kPa, an alarm will be displayed on the platform. The default setting range of the safety temperature is 0-10 degrees Celsius. When the temperature is higher than 10 degrees Celsius or lower than 0 degrees Celsius, an alarm will be displayed on the platform. At this time, the abnormality must be handled promptly.

[0022] Step 5: After the electrolyte is used up, the packaging barrel is cleaned, and the PDA reader is unbound from the smart meter. After cleaning and drying, the PDA reader is re-bound to the packaging barrel.

[0023] A method for locating accident packaging barrels in an intelligent instrument system based on an Internet of Things module and online monitoring includes the following steps:

[0024] Step 1: Connect an RFID tag to each of the multiple battery electrolyte packaging barrels. Use a PDA reader to write the relevant information of the packaging barrel into the RFID tag. Then install the temperature gauge and pressure gauge on the packaging barrel. After the temperature gauge and pressure gauge are installed, the pressure sensor and temperature sensor will automatically work.

[0025] Step 2: Each battery electrolyte packaging barrel has the same RFID tag and is fixed in the same direction. The wireless signal strength will be degraded in a good way. The distance between each battery electrolyte packaging barrel and the PDA reader is calculated based on the change in the received signal strength of the PDA reader.

[0026] Step 3: When the temperature or pressure value of the packaging barrel is abnormal, the staff uses the PDA reader to find the accident packaging barrel. When the PDA reader determines that the distance to the accident packaging barrel is getting closer based on the distance calculation method in step 2, the alarm sound of the PDA reader becomes louder; otherwise, it becomes smaller.

[0027] The intelligent instrument system based on the Internet of Things module and online monitoring has the following beneficial effects:

[0028] (1) The present invention uses an intelligent meter with wireless remote transmission function to replace an ordinary meter, and builds a data receiving server to receive the detection results from the intelligent meter installed on the packaging barrel, so that the production manager can remotely monitor the relevant information of all packaging barrels in real time with higher accuracy.

[0029] (2) The Internet of Things of the present invention utilizes data between different sensors for sharing and analysis, which can not only control the frequency of data reporting, but also avoid misjudgment and even realize the positioning of accident packaging barrels at different heights. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 : Schematic diagram of the smart meter installed on the packaging barrel in the present invention;

[0031] Figure 2 : Schematic diagram of the connection of various modules in the intelligent instrument system based on the Internet of Things module and online monitoring of the present invention;

[0032] Figure 3 : The data acquisition terminal display interface I of the present invention;

[0033] Figure 4 : The data acquisition terminal display interface III of the present invention;

[0034] Figure 5 : The PDA reader in the present invention collects the schematic diagram of the position of each tag.

[0035] Description of reference numerals:

[0036] 1—Packaging barrel; 2—Smart instrument. DETAILED DESCRIPTION

[0037] The following combination Figures 1 to 5 , the present invention is further described:

[0038] like Figure 1-2As shown, an intelligent instrument system based on an Internet of Things module and online monitoring is installed on one or more battery electrolyte packaging barrels 1. The intelligent instrument 2 includes a thermometer and a pressure gauge. The thermometer monitors the temperature value of the electrolyte, and the pressure gauge monitors the pressure value of the electrolyte in the packaging barrel 1. The data output by the thermometer and the pressure gauge are sent to a mobile terminal or a data server via a wireless transmission device, thereby monitoring in real time whether the temperature and pressure of the battery electrolyte in the packaging barrel 1 are normal.

[0039] The wireless transmission device includes RFID, which includes an electronic tag and a PDA reader / writer. The electronic tag supports read and write functions. The temperature value or pressure value information output by the thermometer or pressure gauge can be updated at any time. The electronic tag and the PDA reader / writer realize spatial coupling of the radio frequency signal through a coupling element; within the coupling channel, energy transfer and data exchange are realized according to the timing relationship.

[0040] The smart meter is equipped with a positioning device, which can determine the status of the packaging barrel 1 bound to the smart meter based on the positioning and send it to the mobile terminal or data server through its own wireless transmission device. The status of the barrel bound to the smart meter can be determined based on the positioning: if the packaging barrel is within the company's scope, its status is [Headquarters]; if it is shipped from the company, its status is [Shipping]; if it arrives at the set transportation destination, its status is [At the customer]; if it is shipped from the customer, its status is [Returning to the factory]; if it returns to the company's scope, its status changes back to [Headquarters]. Figure 3 shown.

[0041] Data transmission is compatible with both MQTT and TCP protocols, and the data server can be used to modify the settings of smart meters. For example, when a packaging barrel is being shipped, the frequency of data reporting can be increased; when the barrel is being returned to the factory, the frequency of data transmission can be reduced or the instrument can enter a dormant state.

[0042] A high frequency of data changes output by the positioning device indicates that the packaging barrel 1 is in continuous movement. The frequency of sending the temperature or pressure value output by the thermometer or pressure gauge to the electronic tag is increased, and the data update speed of the mobile terminal or data server is also increased; otherwise, the sending frequency is reduced.

[0043] After the smart meter is installed on the packaging barrel, the employee needs to hold a scanning device and scan the barrel number and the IEMI code of the smart meter one by one. After the scan is completed and submitted to the data receiving server, the smart meter system will consider that the smart meter is bound to the scanned barrel number.

[0044] After each smart meter is turned on, it will periodically send a data packet to the data server. This data packet contains its own IMEI number and the detection results of the sensors it carries. For example, if the meter has pressure detection and positioning functions, the data packet will contain the IMEI number, the current real-time pressure data, and the current real-time positioning data. Figure 4As shown, the temperature meter reports data at intervals of 30 minutes.

[0045] The system also includes a load sensor that monitors the weight of the packaging barrel 1 and the electrolyte therein. As the electrolyte in the packaging barrel 1 gradually decreases, the pressure value output by the pressure sensor decreases. The data server or mobile terminal then corrects the pressure value based on the weight value output by the load sensor via the wireless transmission device, avoiding the misjudgment of a leak in the packaging barrel 1 due to the decrease in pressure. When multiple packaging barrels are stacked, the value output by the load sensor for each packaging barrel decreases from large to small, with the largest value indicating it is at the bottom layer and the smallest value indicating it is at the top layer. The mobile terminal or data server can determine the corresponding layer based on these different values, thereby quickly determining the layer number of the packaging barrel in the event of an accident. Thus, adding a load sensor can achieve multiple benefits, not only avoiding misjudgments of leaks, but also determining the height or layer number of the stacked packaging barrel.

[0046] The present invention provides a method for constructing an intelligent instrument system based on an Internet of Things module and online monitoring, comprising the following steps:

[0047] Step 1: Connect an RFID tag to the battery electrolyte packaging barrel 1, write relevant information of the packaging barrel 1 into the RFID tag through a PDA reader / writer, and then install a temperature gauge and a pressure gauge on the packaging barrel 1; after the temperature gauge and pressure gauge are installed, the pressure sensor and temperature sensor will automatically work.

[0048] Step 2: Scan the QR code of the temperature gauge and pressure gauge with a PDA reader. The smart meter will then send temperature, pressure, battery capacity, time, and positioning data at a sampling interval of N minutes and a sending interval of M minutes. Log in to a mobile terminal or data server platform to query the above information for the corresponding barrel number. Query the relevant information of packaging barrel 1 and view the smart meter data online. N and M are positive numbers.

[0049] Step 3: When the packaging barrel 1 is taken out and filled with electrolyte, the PDA reader is operated to change the production status of the current barrel and fill and ship it. At this time, the mobile terminal or data server platform can observe that the status of the packaging barrel 1 is shipping based on the positioning device, and update the uploaded air pressure data and temperature data once every T hours. The high frequency of data changes output by the positioning device indicates that the packaging barrel 1 is continuously moving, and the frequency of sending the temperature or pressure value output by the thermometer or pressure gauge to the electronic tag is increased, and the data update speed of the mobile terminal or data server is also increased. Conversely, the sending frequency is reduced, and T is a positive number.

[0050] Step 4: The customer observes the data output by the smart meter in real time during use;

[0051] During transportation and use, the default setting range of the safety air pressure is 20-50KPa. When the air pressure is lower than 20kPa or higher than 50kPa, an alarm status will be displayed on the platform; the default setting range of the safety temperature is 0-10 degrees Celsius. When the temperature is higher than 10 degrees Celsius or lower than 0 degrees Celsius, an alarm status will be displayed on the platform. At this time, the abnormality must be handled in a timely manner.

[0052] Step 5: After the electrolyte is used up, the packaging barrel 1 is cleaned, the PDA reader is unbound from the smart meter, and after cleaning and drying, the PDA reader is rebound to the packaging barrel 1.

[0053] like Figure 5 As shown, the method for locating accident packaging barrels in an intelligent instrument system based on an Internet of Things module and online monitoring includes the following steps:

[0054] Step 1: Connect an RFID electronic tag to each of the multiple battery electrolyte packaging barrels 1, write the relevant information of the packaging barrel 1 into the RFID electronic tag through the PDA reader, and then install the temperature gauge and pressure gauge on the packaging barrel 1; after the temperature gauge and pressure gauge are installed, the pressure sensor and temperature sensor will automatically work.

[0055] Step 2: Figure 5 As shown, each battery electrolyte packaging barrel 1 has the same RFID electronic tag and is fixed in the same direction. The wireless signal strength will be degraded in a better way. The distance between each battery electrolyte packaging barrel 1 and the PDA reader is calculated based on the change in the signal strength received by the PDA reader.

[0056] Step 3: When the temperature or pressure value of the packaging barrel 1 is abnormal, the staff uses the PDA reader to find the accident packaging barrel 1. The PDA reader determines that the distance to the accident packaging barrel 1 is getting closer according to the distance calculation method in step 2, and the alarm sound of the PDA reader becomes louder; otherwise, it becomes smaller.

[0057] The above positioning method is suitable for situations where there are many packaging barrels and it is difficult to quickly find the accident packaging barrel. The location of the accident barrel can be determined more efficiently by distance.

[0058] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. An intelligent instrument system based on Internet of Things modules and online monitoring, characterized by: An intelligent meter (2) is installed on one or more battery electrolyte packaging barrels (1), wherein the intelligent meter includes a temperature gauge and a pressure gauge, wherein the temperature gauge monitors the temperature value of the electrolyte, and the pressure gauge monitors the pressure value of the electrolyte in the packaging barrel (1), and the data output by the temperature gauge and the pressure gauge are sent to a mobile terminal or a data server via a wireless transmission device, thereby monitoring in real time whether the temperature and pressure of the battery electrolyte in the packaging barrel (1) are normal; It also includes a load-bearing sensor that monitors the weight of the packaging barrel (1) and the electrolyte therein. When the electrolyte in the packaging barrel (1) is used and gradually decreases, the pressure value output by the pressure sensor will decrease. The data server or mobile terminal will correct the pressure value based on the weight value output by the load-bearing sensor via the wireless transmission device to avoid misjudging that the packaging barrel (1) is leaking due to the decrease in the pressure value. And / or, when multiple packaging barrels (1) are stacked, the value output by the load-bearing sensor of each packaging barrel will change from large to small, with the largest value indicating that it is located at the bottom layer and the smallest value indicating that it is located at the top layer. The mobile terminal or the data server can determine the layer number of the corresponding packaging barrel based on the different values, so that when an accident occurs to the packaging barrel, the data server or the mobile terminal can quickly determine the layer number of the packaging barrel based on the weight value output by the load-bearing sensor through the wireless transmission device.

2. The intelligent instrument system based on the Internet of Things module and online monitoring according to claim 1 is characterized in that: The wireless transmission device includes RFID, which includes an electronic tag and a PDA reader / writer. The electronic tag supports reading and writing functions. The temperature value or pressure value information output by the thermometer or pressure gauge can be updated at any time. The electronic tag and the PDA reader / writer realize spatial coupling of the radio frequency signal through a coupling element; within the coupling channel, energy transfer and data exchange are realized according to the timing relationship.

3. The intelligent instrument system based on the Internet of Things module and online monitoring according to claim 2 is characterized in that: The smart meter is provided with a positioning device, which can determine the status of the packaging barrel (1) bound to the smart meter based on the positioning and send the status to the mobile terminal or data server through its own wireless transmission device.

4. The intelligent instrument system based on the Internet of Things module and online monitoring according to claim 3 is characterized in that: Data transmission is compatible with MQTT and TCP protocols, and the setting parameters of smart meters can be modified through the data server.

5. The intelligent instrument system based on the Internet of Things module and online monitoring according to claim 4 is characterized in that: A high frequency of data changes output by the positioning device indicates that the packaging barrel (1) is in continuous movement, and the frequency of sending the temperature value or pressure value output by the thermometer or pressure gauge to the electronic tag is increased, and the data update speed of the mobile terminal or data server is also increased; conversely, the sending frequency is reduced.

6. The intelligent instrument system based on the Internet of Things module and online monitoring according to claim 5 is characterized in that: After the smart meter is installed on the packaging barrel, the employee needs to hold a scanning device and scan the barrel number and the IEMI code of the smart meter one by one. After the scan is completed and submitted to the data receiving server, the smart meter system will consider that the smart meter is bound to the scanned barrel number.

7. The intelligent instrument system based on the Internet of Things module and online monitoring according to claim 6 is characterized in that: After each smart meter is turned on, it will periodically send a data packet to the data server. This data packet contains its own IMEI number and the detection results of the sensors it carries.

8. A method for constructing an intelligent instrument system based on an Internet of Things module and online monitoring as described in claim 7, comprising the following steps: Step 1: Connect an RFID electronic tag to a battery electrolyte packaging barrel (1), write relevant information of the packaging barrel (1) into the RFID electronic tag through a PDA reader / writer, and then install a temperature gauge and a pressure gauge on the packaging barrel (1); after the temperature gauge and the pressure gauge are installed, the pressure sensor and the temperature sensor automatically work; Step 2: Scan the QR code of the temperature meter and pressure meter through the PDA reader. At this time, the smart meter will send temperature, pressure, battery capacity, time, and positioning data at a sampling interval of N minutes and a sending interval of M minutes. The above information of the corresponding barrel number can be queried by logging into the mobile terminal or data server platform; query the relevant information of the packaging barrel (1) and view the smart meter data online. N and M are positive numbers. Step 3, when the packaging barrel (1) is taken out and filled with electrolyte, the PDA reader is operated at this time to change the production status of the current barrel, fill and ship; at this time, the mobile terminal or data server platform can observe that the status of the packaging barrel (1) is being shipped according to the positioning device, and the uploaded air pressure data and temperature data are updated once every T hours; the high frequency of data changes output by the positioning device indicates that the packaging barrel (1) is continuously moving, and the frequency of sending the temperature value or pressure value output by the thermometer or pressure gauge to the electronic tag is increased, and the data update speed of the mobile terminal or data server is also increased; on the contrary, the sending frequency is reduced, and T is a positive number; Step 4: The customer observes the data output by the smart meter in real time during use; During transportation and use, the default setting range of the safety air pressure is 20-50kPa. When the air pressure is lower than 20kPa or higher than 50kPa, an alarm will be displayed on the platform. The default setting range of the safety temperature is 0-10 degrees Celsius. When the temperature is higher than 10 degrees Celsius or lower than 0 degrees Celsius, an alarm will be displayed on the platform. At this time, the abnormality must be handled promptly. Step 5: After the electrolyte is used up, the packaging barrel (1) is cleaned, and the PDA reader is unbound from the smart meter. After waiting for cleaning and drying, the PDA reader is rebound to the packaging barrel (1).

9. A method for locating an accident packaging barrel in an intelligent instrument system based on an Internet of Things module and online monitoring according to claim 7, comprising the following steps: Step 1: Connect an RFID electronic tag to each of the plurality of battery electrolyte packaging barrels (1), write relevant information of the packaging barrel (1) into the RFID electronic tag through a PDA reader / writer, and then install a temperature gauge and a pressure gauge on the packaging barrel (1); after the temperature gauge and the pressure gauge are installed, the pressure sensor and the temperature sensor automatically work; Step 2: Each battery electrolyte packaging barrel (1) has the same RFID electronic tag and is fixed in the same direction. The wireless signal strength will be degraded. The distance between each battery electrolyte packaging barrel (1) and the PDA reader is calculated based on the change in the signal strength received by the PDA reader; Step 3: When the temperature or pressure value of the packaging barrel (1) is abnormal, the staff uses the PDA reader to find the accident packaging barrel (1). When the PDA reader determines that the distance to the accident packaging barrel (1) is getting closer according to the distance calculation method in step 2, the alarm sound emitted by the PDA reader becomes louder; otherwise, it becomes smaller.

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