Battery temperature monitoring system and method

Abstract

The present invention relates to a battery temperature monitoring system and method, the system comprises a battery, a battery detection device, a power supply monitoring server and an infrared thermal imaging camera for detecting the battery temperature, the infrared thermal imaging camera is connected to the power supply monitoring server via a switch, the input end of the battery detection device is connected to the battery, the output end of the battery detection device is connected to the power supply monitoring server via a switch, and the power supply monitoring server determines whether the current battery temperature is within a normal alarm threshold range according to the current state of the battery and the acquired temperature information. The present invention uses an infrared thermal imaging camera to detect the battery temperature in all directions, and can timely detect the high temperature fire caused by leakage at different shell positions of the battery, and the detection means should be safe and reliable, not destroy or affect the stability of the connection between the batteries, not aggravate the self-discharge of the battery, and have high alarm accuracy.

Description

Technical Field

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

[0002] In various industries, there are many cases of battery fires in power system accidents. The main causes include poor connection of battery connecting wires, battery leakage, excessive battery internal resistance, battery short circuit and other factors.

[0003] The current monitoring method mainly monitors the ambient temperature of the battery cabinet or the temperature of the single pole, and fails to conduct an overall analysis of the battery operation status. It simply relies on single-point temperature indicators and has monitoring blind spots. The specific problems are as follows:

[0004] 1. Ambient temperature monitoring relies on a single temperature probe, which can only obtain the ambient temperature. There is an alarm delay for high-temperature fires caused by individual monomers.

[0005] 2. Battery cell pole temperature probes require a temperature probe to be installed on each battery, and because the monitoring probe is installed on the pole or the battery surface, it is impossible to detect high-temperature fires caused by leakage at different battery shell positions in a timely manner.

[0006] 3. The single-cell detection device needs to be installed on the battery, which increases the hidden dangers of battery wiring.

[0007] 4. The monitoring relies on a single temperature indicator and lacks corresponding logical judgment for the temperature rise under different charging current conditions, which can easily cause false high temperature alarms during high current charging and discharging of the battery. Summary of the invention

[0008] The purpose of the present invention is to overcome the defects of the prior art and provide a battery temperature monitoring system and method, which can detect the battery temperature in all directions and can timely detect high-temperature fire caused by leakage at different battery shell positions. The detection means should be safe and reliable, will not destroy or affect the stability of the connection between batteries, will not aggravate the self-discharge of the battery, and has high alarm accuracy.

[0009] The technical solution of the present invention is implemented as follows: The present invention discloses a battery temperature monitoring system, including a battery, a battery detection device, a power supply monitoring server and an infrared thermal imaging camera for battery temperature detection, wherein the infrared thermal imaging camera is connected to the power supply monitoring server via a switch, the input end of the battery detection device is connected to the battery, and the output end of the battery detection device is connected to the power supply monitoring server via the switch.

[0010] Furthermore, the battery temperature monitoring system also includes a local monitoring unit, the output end of the battery detection device is connected to the local monitoring unit, the local monitoring unit is connected to the access switch through the photoelectric converter, the access switch is connected to the core switch, and the core switch is connected to the power monitoring server.

[0011] Furthermore, the battery temperature monitoring system also includes a UPS power supply, which includes an AC input interface, a rectifier, an inverter, and an AC output interface. The input end of the rectifier is connected to the AC input interface, the output end of the rectifier is respectively connected to the first battery and the input end of the inverter, and the output end of the inverter is connected to the AC output interface; a switch is provided between the output end of the rectifier and the first battery; and a switch is provided between the output end of the inverter and the AC output interface.

[0012] The battery adopts the front terminal method, and the camera is set on the terminal side.

[0013] Furthermore, the battery is arranged on a battery rack, and an infrared thermal imaging camera is arranged directly in front of the battery rack. The battery temperature is detected by the infrared thermal imaging camera, and the temperature information is uploaded to the power supply monitoring server at the same time.

[0014] Furthermore, the batteries are arranged on a battery rack, each layer of a single battery rack has multiple rows of batteries, and infrared thermal imaging cameras are arranged on the front and back of the battery rack.

[0015] Furthermore, the battery is arranged on a battery rack, a slide rail is arranged around the battery rack, an automatic running mechanism is arranged on the slide rail, and the infrared thermal imaging camera is arranged on the automatic running mechanism, and the infrared thermal imaging camera is driven by the automatic running mechanism to perform a surrounding inspection.

[0016] Furthermore, the power monitoring server communicates with the monitoring host; the battery detection device is used to collect the battery status, charging voltage, charging current, and discharge current data of the battery, and transmits the collected battery status, charging voltage, charging current, and discharge current data to the power monitoring server via the switch.

[0017] The present invention discloses a battery temperature monitoring method, comprising the following steps:

[0018] The battery detection device collects the battery status, charging voltage, charging current, and discharge current data of the battery, and transmits the collected battery status, charging voltage, charging current, and discharge current data to the power supply monitoring server;

[0019] The temperature of the battery is detected by an infrared thermal imaging camera, and the detected temperature information is transmitted to the power monitoring server;

[0020] The power monitoring server determines whether the current battery temperature is within a normal alarm threshold range according to the current state of the battery and the acquired temperature information.

[0021] Furthermore, based on the acquired battery operating data, the battery operating status is analyzed and divided into several states: floating charge operating state, discharge state, constant current equalization charge state, and constant voltage equalization charge state. Different alarms and alarm thresholds are set for different battery operating states. The power monitoring server determines whether the current battery temperature is within the normal alarm threshold range based on the current battery operating state, and issues an alarm when it exceeds the alarm threshold range.

[0022] Furthermore, based on the battery operation data obtained, the battery operation state is analyzed, specifically including: if the current charging current is less than the set value and continues for the set time, and the current battery charging voltage is constant or floats with the battery temperature according to the temperature compensation coefficient, then the battery operation state is a floating charge operation state; if the current battery voltage drops and the battery current is a negative value, then the battery operation state is a discharge state; if the current battery charging current is constant and the charging voltage increases with the charging time, then the battery operation state is a constant current equalization charge state; if the current voltage is constant and the charging current decreases with the charging time, then the battery operation state is a constant voltage equalization charge state.

[0023] Further, when the battery operation state is a floating charge operation state and the highest temperature>average temperature+T1, it is determined that the battery is partially overheated;

[0024] When the battery operation state is the floating charge operation state and the highest temperature - the lowest temperature > T2, it is determined that the temperature between the batteries is uneven;

[0025] When the battery is in the floating charge state and the maximum temperature is > T3, the battery is judged to be high temperature;

[0026] When the battery is in the discharge state and the highest temperature > T4, the battery is judged to be high temperature; T4>T3;

[0027] When the battery is in constant current equalization charging state or constant voltage equalization charging state and the highest temperature > T5, the battery is judged to be high temperature; T5>T3;

[0028] When the battery is in discharge state and the highest temperature > the lowest temperature + T6, it is determined that the battery has poor contact;

[0029] When the battery is in constant current equalization charging state and the highest temperature > the lowest temperature + T7, it is determined that the battery has poor contact.

[0030] Furthermore, the power monitoring server sends the analysis results to the monitoring host. After receiving the analysis results from the power monitoring server, the monitoring host performs unified and centralized processing. If there is an abnormality, it will alarm in time and generate a processing log. The monitoring host is used to complete the alarm notification and recording functions of temperature abnormalities.

[0031] The present invention has at least the following beneficial effects:

[0032] The present invention uses an infrared thermal imaging camera to detect the battery temperature in all directions, including the battery's ambient temperature, connector temperature, shell temperature and temperature difference between batteries. It can monitor abnormal temperature conditions of single batteries and can timely detect high-temperature fires caused by leakage at different battery shell positions. The detection method should be safe and reliable, and will not destroy or affect the stability of the connection between batteries, and will not aggravate the self-discharge of the battery.

[0033] Since the temperature of the battery is different in different operating states, the battery operating state is analyzed through the battery operating state information provided by the battery detection device, and the battery operating state is divided into floating charge state, discharge state, constant current equalization charge state, and constant voltage equalization charge state. Different temperature alarm thresholds are set according to the charge and discharge state of the battery. The power supply monitoring server determines whether the current battery temperature is within the normal alarm threshold range based on the current battery operating state, and issues an alarm when it exceeds the alarm threshold range, thereby improving the alarm accuracy and not easily causing high temperature false alarms. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A network architecture diagram of a battery temperature monitoring system provided by an embodiment of the present invention;

[0036] Figure 2 A network architecture diagram of a battery system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1 and Figure 2 An embodiment of the present invention provides a battery temperature monitoring system, including a battery system, a battery detection device, a power monitoring server, and an infrared thermal imaging camera for battery temperature detection, wherein the infrared thermal imaging camera is connected to the power monitoring server via a switch, the input end of the battery detection device is connected to a battery (or battery pack) of the battery system, and the output end of the battery detection device is connected to the power monitoring server via the switch.

[0039] Furthermore, the power supply monitoring server communicates with the monitoring host.

[0040] Furthermore, the battery temperature monitoring system of the present invention further includes a local monitoring unit, the output end of the battery detection device is connected to the local monitoring unit, the local monitoring unit is connected to an access switch via a photoelectric converter, the access switch is connected to a core switch, and the core switch is connected to a power monitoring server. Each access switch is used to aggregate data corresponding to multiple battery groups to the switch, and send the data to the power monitoring server uniformly via the switch.

[0041] Furthermore, the local monitoring unit includes a processor, and the local monitoring unit also includes an AC intelligent distribution panel, and the AC intelligent distribution panel is connected to the processor.

[0042] Furthermore, the battery system includes a UPS power supply, which includes an AC input interface, a rectifier, an inverter, and an AC output interface. The input end of the rectifier is connected to the AC input interface, the output end of the rectifier is respectively connected to the first battery and the input end of the inverter, and the output end of the inverter is connected to the AC output interface; a switch is provided between the output end of the rectifier and the first battery; and a switch is provided between the output end of the inverter and the AC output interface.

[0043] Furthermore, the battery system of the present invention can also be provided with a high-frequency switching power supply as needed, and the high-frequency switching power supply includes an AC input interface, a rectifier, and a DC output interface. The AC input interface is connected to the AC output interface of the UPS power supply, the input end of the rectifier is connected to the AC input interface, the output end of the rectifier is connected to the DC output interface, and the output end of the rectifier is connected to the second battery.

[0044] The batteries of the present invention may be of various types, including lead acid, gel and lithium batteries.

[0045] The present invention obtains battery data through two ways, which are as follows: collecting battery data through a battery detection device to obtain data such as battery status, charging voltage, charging current, and discharge current; setting a thermal imaging camera directly in front of the battery rack, performing temperature detection through the thermal imager area inspection mode, and uploading data such as the highest temperature, lowest temperature, and average temperature to the background as a basis for alarm judgment.

[0046] Considering that the fire point of the battery is generally at the pole position, the present invention needs to determine the location of the thermal imaging camera according to the location of the battery pole terminal, so it is recommended that the battery adopts the front terminal method as much as possible and the camera is set on the terminal side. The present invention can set the camera to polling mode, perform patrol scanning on the entire battery, and upload the collected temperature data to the power monitoring server in real time.

[0047] Furthermore, the battery adopts a front terminal mode, and the camera is arranged on the terminal side.

[0048] Furthermore, the battery is arranged on a battery rack, and an infrared thermal imaging camera is arranged directly in front of the battery rack. The battery temperature is detected by the infrared thermal imaging camera, and the temperature information is uploaded to the power supply monitoring server at the same time.

[0049] Furthermore, the batteries are arranged on the battery rack. For example, if a single battery rack has multiple rows of batteries on each layer, infrared thermal imaging cameras can be arranged on the front and back of the battery rack, or slide rails can be arranged for circumferential inspection. The specific structure is: a slide rail is arranged around the battery rack, an automatic running mechanism is arranged on the slide rail, and the infrared thermal imaging camera is arranged on the automatic running mechanism, and the infrared thermal imaging camera is driven by the automatic running mechanism for circumferential inspection. The slide rail is arranged in a ring. The automatic running mechanism of this embodiment can adopt an existing running mechanism that runs around a ring track, such as a robot.

[0050] There should be no more than 2 rows of battery racks on each layer to avoid obstruction and affect the effect.

[0051] The battery detection device of the present invention is used to collect the battery status, charging voltage, charging current, and discharge current data of the battery, and transmit the collected battery status, charging voltage, charging current, and discharge current data to the power monitoring server via the switch. The battery detection device of this embodiment can adopt the existing battery monitoring circuit with the function of detecting the battery status, charging voltage, charging current, and discharge current data of the battery, which will not be described in detail here.

[0052] The present invention discloses a battery temperature monitoring method, comprising the following steps:

[0053] The battery detection device collects the battery status, charging voltage, charging current, and discharge current data of the battery, and transmits the collected battery status, charging voltage, charging current, and discharge current data to the power supply monitoring server;

[0054] The temperature of the battery is detected by an infrared thermal imaging camera, and the detected temperature information is transmitted to the power monitoring server;

[0055] The power monitoring server determines whether the current battery temperature is within a normal alarm threshold range according to the current state of the battery and the acquired temperature information.

[0056] Furthermore, based on the acquired battery operating data, the battery operating status is analyzed and divided into several states: floating charge operating state, discharge state, constant current equalization charge state, and constant voltage equalization charge state. Different alarms and alarm thresholds are set for different battery operating states. The power monitoring server determines whether the current battery temperature is within the normal alarm threshold range based on the current battery operating status, and issues an alarm when it exceeds the threshold range.

[0057] According to the battery operation data obtained, the battery operation status is analyzed, specifically including: if the current charging current is less than the set value (such as 0.01C, which can be adjusted as needed) and continues for the set time (such as 3 hours, which can be adjusted as needed), and the current battery charging voltage is constant or floats with the battery temperature according to the temperature compensation coefficient, then the battery operation status is the floating charge operation status; if the current battery voltage drops and the battery current is a negative value, then the battery operation status is the discharge state; if the current battery charging current is constant and the charging voltage increases with the charging time, then the battery operation status is the constant current equalization charge state; if the current voltage is constant and the charging current decreases with the charging time, then the battery operation status is the constant voltage equalization charge state.

[0058] When the battery is in floating charge mode, it is in thermal equilibrium. Under normal conditions, the battery temperature is equal to the ambient temperature.

[0059] When the battery is in the discharge state, the battery generates Joule heat due to discharge, and the battery temperature is higher than the ambient temperature. The temperature difference depends on the discharge current, the tightness of the connectors, and the heat dissipation. The larger the current, the looser the connectors, and the worse the heat dissipation, the greater the temperature difference.

[0060] When the battery is in constant current equalization charging state, the battery generates Joule heat due to charging, and the battery temperature is higher than the ambient temperature. The temperature difference depends on the discharge current, the tightness of the connectors, and the heat dissipation. The greater the current, the looser the connectors, and the worse the heat dissipation, the greater the temperature difference.

[0061] Further, when the battery operation state is the floating charge operation state and the highest temperature is greater than the average temperature + T1 (T1 is selected according to actual needs and can be 3°C), it is determined that the battery is partially overheated;

[0062] When the battery operation state is the floating charge operation state and the highest temperature - the lowest temperature > T2 (T2 is selected according to actual needs and can be 3°C), it is determined that the temperature between the batteries is uneven;

[0063] When the battery is in the floating charge state and the maximum temperature is greater than T3 (T3 is selected according to actual needs and can be 30°C), the battery is judged to be high temperature;

[0064] When the battery is in the discharge state and the highest temperature is greater than T4 (T4 is selected according to actual needs and can be 35°C), the battery is judged to be high temperature; T4>T3;

[0065] When the battery is in constant current equalization charging state or constant voltage equalization charging state and the highest temperature is > T5 (T5 is selected according to actual needs and can be 35°C), the battery is judged to be high temperature; T5>T3;

[0066] When the battery is in discharge state and the highest temperature > the lowest temperature + T6 (T6 is selected according to actual needs and can be 20°C), the battery is judged to have poor contact;

[0067] When the battery is in constant current equalization charging state and the highest temperature is greater than the lowest temperature + T7 (T7 is selected according to actual needs and can be 20°C), it is determined that the battery has poor contact.

[0068] The background sets different alarms and alarm thresholds based on the current battery charge and discharge status. The larger the charge and discharge current, the higher the high temperature alarm threshold. Based on actual experience, the reference threshold is set as follows. The threshold can be adjusted appropriately according to the number of batteries and the environmental conditions of the equipment room.

[0069]

[0070]

[0071] Furthermore, the background power supply monitoring server sends the analysis results to the monitoring host. After receiving the analysis results from the background power supply monitoring server, the monitoring host performs unified and centralized processing. If there is an abnormality, it will alarm in time and generate a processing log. The monitoring host is used to complete the alarm notification and recording functions of temperature abnormalities.

[0072] The present invention uses an infrared thermal imaging camera to inspect and scan the battery, which has the following advantages compared to the current monitoring mode:

[0073] 1) The temperature of different locations such as battery poles, shells, and battery environment can be monitored and summarized into the system;

[0074] 2) The temperature monitoring method does not require changes to the original electrical connections between batteries;

[0075] 3) It will not cause additional self-discharge loss of the battery;

[0076] 4) It can determine whether there is abnormal high temperature according to different charging and discharging scenarios;

[0077] 5) It can identify the scenario of uneven battery temperature;

[0078] 6) It can identify abnormal battery connector scenarios.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery temperature monitoring method, characterized in that: The steps include: The battery detection device collects the battery status, charging voltage, charging current, and discharge current data of the battery, and transmits the collected battery status, charging voltage, charging current, and discharge current data to the power supply monitoring server; The temperature of the battery is detected by an infrared thermal imaging camera, and the detected temperature information is transmitted to the power monitoring server; The power monitoring server determines whether the current battery temperature is within the normal alarm threshold range based on the current state of the battery and the acquired temperature information; According to the battery operation data obtained, the battery operation status is analyzed and divided into floating charge operation status, discharge status, constant current equalization charge status, and constant voltage equalization charge status. Different alarms and alarm thresholds are set for different battery operation statuses. The power monitoring server determines whether the current battery temperature is within the normal alarm threshold range based on the current battery operation status, and issues an alarm when it exceeds the alarm threshold range; According to the battery operation data obtained, the battery operation state is analyzed, specifically including: if the current charging current is less than the set value and continues for the set time, and the current battery charging voltage is constant or fluctuates with the battery temperature according to the temperature compensation coefficient, the battery operation state is the floating charge operation state; if the current battery voltage drops and the battery current is a negative value, the battery operation state is the discharge state; if the current battery charging current is constant and the charging voltage increases with the charging time, the battery operation state is the constant current equalization charge state; if the current voltage is constant and the charging current decreases with the charging time, the battery operation state is the constant voltage equalization charge state; When the battery is in the floating charge state and the highest temperature is greater than the average temperature + T1, it is determined that the battery is partially overheated; When the battery operation state is the floating charge operation state and the highest temperature - the lowest temperature > T2, it is determined that the temperature between the batteries is uneven; When the battery is in the floating charge state and the maximum temperature is > T3, the battery is judged to be high temperature; When the battery is in the discharge state and the highest temperature > T4, the battery is judged to be high temperature; T4>T3; When the battery is in constant current equalization charging state or constant voltage equalization charging state and the highest temperature > T5, the battery is judged to be high temperature; T5>T3; When the battery is in discharge state and the highest temperature > the lowest temperature + T6, it is determined that the battery has poor contact; When the battery is in constant current equalization charging state and the highest temperature > the lowest temperature + T7, it is determined that the battery has poor contact.

2. The battery temperature monitoring method according to claim 1, characterized in that: The power monitoring server sends the analysis results to the monitoring host. After receiving the analysis results from the power monitoring server, the monitoring host performs unified and centralized processing. If there is an abnormality, it will alarm in time and generate a processing log. The monitoring host is used to complete the alarm notification and recording functions of temperature abnormalities.

3. A battery temperature monitoring system, characterized in that: A battery temperature monitoring method as described in claim 1 or 2 is adopted; the system includes a battery, a battery detection device, a power monitoring server and an infrared thermal imaging camera for battery temperature detection, the infrared thermal imaging camera is connected to the power monitoring server via a switch, the input end of the battery detection device is connected to the battery, and the output end of the battery detection device is connected to the power monitoring server via the switch.

4. The battery temperature monitoring system according to claim 3, characterized in that: It also includes a local monitoring unit, the output end of the battery detection device is connected to the local monitoring unit, the local monitoring unit is connected to the access switch through a photoelectric converter, the access switch is connected to the core switch, and the core switch is connected to the power monitoring server.

5. The battery temperature monitoring system according to claim 3, characterized in that: It also includes a UPS power supply, which includes an AC input interface, a rectifier, an inverter, and an AC output interface. The input end of the rectifier is connected to the AC input interface, the output end of the rectifier is respectively connected to the first battery and the input end of the inverter, and the output end of the inverter is connected to the AC output interface; a switch is provided between the output end of the rectifier and the first battery; and a switch is provided between the output end of the inverter and the AC output interface.

6. The battery temperature monitoring system according to claim 3, characterized in that: The batteries are set on the battery rack, and an infrared thermal imaging camera is set in front of the battery rack. The battery temperature is detected by the infrared thermal imaging camera, and the temperature information is uploaded to the power monitoring server. If a single battery rack has multiple columns of batteries on each layer, infrared thermal imaging cameras are set on the front and back of the battery rack.

7. The battery temperature monitoring system according to claim 3, characterized in that: The storage battery is arranged on a battery rack, a slide rail is arranged around the battery rack, an automatic running mechanism is arranged on the slide rail, and the infrared thermal imaging camera is arranged on the automatic running mechanism, and the infrared thermal imaging camera is driven by the automatic running mechanism to perform a surrounding inspection.

8. The battery temperature monitoring system according to claim 3, characterized in that: The power monitoring server communicates with the monitoring host; the battery detection device is used to collect the battery status, charging voltage, charging current, and discharge current data of the battery, and transmits the collected battery status, charging voltage, charging current, and discharge current data to the power monitoring server via the switch.

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