A battery temperature monitoring method, device and medium

Abstract

The present invention provides a battery temperature monitoring method, device and medium in the technical field of battery management. The method includes: Step S10, obtaining the temperature E of the battery in real time through the BMS, and obtaining the temperature F of each high-voltage connector, the temperature G of each connector and the ambient temperature A in real time through a thermal imaging device; Step S20, calculating the theoretical temperature B of the battery after charge and discharge based on the ambient temperature A, obtaining the warning temperature D based on the type of the battery, and calculating the protection temperature C based on the warning temperature D; Step S30, monitoring the temperature E, the temperature F and the temperature G in real time based on the theoretical temperature B, the protection temperature C and the warning temperature D; Step S40, monitoring the contact state of the connector and the battery performance in real time based on the temperature G; Step S50, saving the temperature E, the temperature F and the temperature G. The advantages of the present invention are: greatly improving the comprehensiveness of battery temperature monitoring, and thus greatly reducing the risk of battery thermal runaway.

Description

Technical Field

[0001] The present invention relates to the technical field of battery management, and particularly to a battery temperature monitoring method, device, and medium. Background Art

[0002] In the current era that advocates green economy and promotes sustainable development, new energy vehicles are considered an important direction for future development. Power batteries play a crucial role in new energy vehicles. They can not only store energy but also convert electrical energy and chemical energy.

[0003] During the testing stage of battery production and the actual use process, it is necessary to monitor the battery temperature because when the temperature is too high, it will cause battery thermal runaway, which will in turn lead to a series of safety problems. For the monitoring of battery temperature, traditionally, only the BMS (Battery Management System) is used to collect the battery temperature, and an alarm is given when the temperature is higher than the set threshold. However, the traditional method does not monitor the temperature of the high-voltage connectors, connectors, etc. of the battery and the ambient temperature, and the monitoring dimension is single, resulting in the risk of over-temperature spontaneous combustion of the battery.

[0004] Therefore, how to provide a battery temperature monitoring method, device, and medium to improve the comprehensiveness of battery temperature monitoring and thus reduce the risk of battery thermal runaway has become an urgent technical problem to be solved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a battery temperature monitoring method, device, and medium to improve the comprehensiveness of battery temperature monitoring and thus reduce the risk of battery thermal runaway.

[0006] In a first aspect, the present invention provides a battery temperature monitoring method, including the following steps:

[0007] Step S10: Obtain the temperature E of the battery in real time through the BMS, obtain the temperature F of each high-voltage connector, the temperature G of each connector, and the ambient temperature A in real time through a thermal imaging device, and record and archive the content captured by the thermal imaging device;

[0008] Step S20: Calculate the theoretical temperature B of the battery after charge and discharge based on the ambient temperature A, obtain the alarm temperature D based on the type of the battery, and calculate the protection temperature C based on the alarm temperature D;

[0009] Step S30: Monitor the temperature E, temperature F, and temperature G in real time based on the theoretical temperature B, protection temperature C, and alarm temperature D;

[0010] Step S40: Monitor the contact state of the connector and the battery performance in real time based on the temperature G;

[0011] Step S50: Save the temperature E, temperature F, and temperature G.

[0012] Further, in the step S10, the specific operation of recording and archiving the content captured by the thermal imaging device is as follows:

[0013] Record the content captured by the thermal imaging device, remove the sound in the generated video, reduce the bit rate and the number of video frames of the video, and compress it into a rar file for archiving.

[0014] Further, in the step S20, the calculation formula for the theoretical temperature B is:

[0015] B = I 2 Rt / (c*m)*α + A;

[0016] Where, I represents the current value of charge and discharge; R represents the resistance; t represents the charge and discharge time; c represents the specific heat capacity of the battery; m represents the mass of the battery; α represents the energy conversion rate.

[0017] Further, in the step S20, the calculation formula for the protection temperature C is:

[0018] C = a*D, 0 < a < 1.

[0019] Further, the value of a is 0.9.

[0020] Further, the step S30 specifically includes:

[0021] Step S31: Respectively determine whether the temperature E, temperature F, or temperature G is greater than the theoretical temperature B. If so, proceed to step S32; if not, continue monitoring;

[0022] Step S32: Respectively determine whether the temperature E, temperature F, or temperature G is greater than the protection temperature C. If so, proceed to step S33; if not, pop up a window to prompt that the temperature is about to exceed the limit, and control the indicator light to turn yellow for prompt;

[0023] Step S33: Respectively determine whether the temperature E, temperature F, or temperature G is greater than the warning temperature D. If so, stop the battery charge and discharge, disconnect the charge and discharge circuit, control the indicator light to turn red for prompt, control the buzzer to alarm, and trigger the fire protection system; if not, stop the battery charge and discharge, disconnect the charge and discharge circuit, control the indicator light to turn red for prompt, and control the buzzer to alarm.

[0024] Further, the step S40 is specifically:

[0025] Set a first ratio and a second ratio;

[0026] Determine whether, at the same time, the temperature G of an individual connector is higher than the first ratio of the average value of the temperature G. If so, it indicates that the corresponding connector is not tightened; if not, it indicates that all connectors are tightened.

[0027] Determine whether each of the temperature G is higher than the second ratio of the historical average value. If so, it indicates that the battery performance is unqualified; if not, it indicates that the battery performance is qualified.

[0028] Further, the step S50 is specifically as follows:

[0029] Save the temperature E, temperature F, and temperature G, and calculate the upper limit value and the lower limit value of the temperature E, temperature F, and temperature G through the 6sigma algorithm.

[0030] In a second aspect, the present invention provides a battery temperature monitoring device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the method described in the first aspect is implemented.

[0031] In a third aspect, the present invention provides a battery temperature monitoring medium, on which a computer program is stored, and when the program is executed by a processor, the method described in the first aspect is implemented.

[0032] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0033] 1. The temperature E of the battery is obtained in real time through the BMS, and the temperature F of each high-voltage joint, the temperature G of each connector, and the ambient temperature A are obtained in real time through the thermal imaging device. By using the theoretical temperature B, the protection temperature C, and the warning temperature D, the temperature E, temperature F, and temperature G are monitored in real time and hierarchical alarm control is performed, that is, the temperature of multiple regions of the battery is monitored from three dimensions of the theoretical temperature B, the protection temperature C, and the warning temperature D, thereby greatly improving the comprehensiveness of battery temperature monitoring, further greatly reducing the risk of battery thermal runaway, and greatly improving safety.

[0034] 2. By recording and archiving the content captured by the thermal imaging device, it is convenient for later traceability and quickly locating the cause of thermal runaway. And by removing the sound in the video, reducing the bit rate and the number of video frames of the video and compressing it into a rar file, the size of the video is greatly reduced, and the same storage space can store videos for a longer time.

[0035] 3. By comparing and analyzing the temperature G of each connector at the same moment with the average value at the same moment, and comparing and analyzing the temperature G with the historical average value, it can quickly judge whether the connector is tightened and whether the battery performance is qualified, further improving safety.

[0036] The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specific embodiments of the present invention are given. Description of the Drawings

[0037] The present invention will be further described below with reference to the accompanying drawings in conjunction with embodiments.

[0038] Figure 1 It is a flowchart of a battery temperature monitoring method of the present invention.

[0039] Figure 2 It is a schematic structural diagram of a battery temperature monitoring device of the present invention.

[0040] Figure 3 It is a schematic structural diagram of a battery temperature monitoring medium of the present invention. Detailed Embodiments

[0041] Embodiments of the present application provide a battery temperature monitoring method, device and medium, so as to improve the comprehensiveness of battery temperature monitoring, and further reduce the risk of battery thermal runaway.

[0042] The technical solution in the embodiments of the present application has the following general idea: The temperature E of the battery is obtained in real time through the BMS, and the temperature F of each high-voltage joint, the temperature G of each connector, and the ambient temperature A are obtained in real time through a thermal imaging device, and the content captured by the thermal imaging device is recorded and archived to facilitate the later playback of the temperature change during the charge and discharge process for more intuitive traceability; the temperature E, temperature F and temperature G are monitored in real time and classified alarm control is carried out by using the theoretical temperature B, protection temperature C and alarm temperature D, so as to improve the comprehensiveness of battery temperature monitoring and reduce the risk of battery thermal runaway.

[0043] Embodiment 1

[0044] This embodiment provides a battery temperature monitoring method, as Figure 1 shown, including the following steps:

[0045] Step S10: Obtain the temperature E of the battery (i.e., the temperature inside the battery) in real time through the BMS, obtain the temperature F of each high-voltage joint, the temperature G of each connector, and the ambient temperature A in real time through a plurality of thermal imaging devices, and record and archive the content captured by the thermal imaging device to facilitate the later playback of the temperature change during the charge and discharge process for more intuitive traceability;

[0046] Step S20: Calculate the theoretical temperature B of the battery after charge and discharge based on the ambient temperature A, obtain the alarm temperature D based on the type of the battery, and calculate the protection temperature C based on the alarm temperature D;

[0047] The alarm temperature D of various types of batteries is as follows:

[0048] The charge and discharge temperature range of a lithium polymer battery (Li-polymer) is: -20°C to 60°C; the charge and discharge temperature range of a nickel-metal hydride battery (Ni-Mh) is: -10°C to 45°C; the charge and discharge temperature range of a lithium polymer battery (Li-polymer) is: -20°C to 60°C; the charge and discharge temperature range of a lead-acid battery (Sealed) is: 0°C to 45°C; the alarm temperatures D of lithium polymer batteries, nickel-metal hydride batteries, lithium polymer batteries, and lead-acid batteries are 60°C, 45°C, 60°C, and 45°C respectively.

[0049] Step S30: Based on the theoretical temperature B, protection temperature C, and alarm temperature D, monitor the temperature E, temperature F, and temperature G in real time;

[0050] Step S40: Based on the temperature G, monitor the contact state of the connector and the battery performance in real time;

[0051] Step S50: Save the temperature E, temperature F, and temperature G.

[0052] In specific implementation, an upper limit TempMaxLimit and a lower limit TempMinLimit of the ambient temperature A can also be set. Only when the ambient temperature is within the interval [TempMinLimit, TempMaxLimit], is battery charge and discharge allowed.

[0053] In the step S10, the specific operation of recording and archiving the content captured by the thermal imaging device is as follows:

[0054] Record the content captured by the thermal imaging device. After removing the sound in the generated video, reduce the bit rate and the number of video frames of the video, and compress it into a rar file for archiving.

[0055] In the step S20, the calculation formula for the theoretical temperature B is:

[0056] B = I 2 Rt / (c*m)*α + A;

[0057] Wherein, I represents the current value of charge and discharge; R represents the resistance; t represents the charge and discharge time; c represents the specific heat capacity of the battery; m represents the mass of the battery; α represents the energy conversion rate.

[0058] The calculation formula for the theoretical temperature B is derived from the following formula:

[0059]

[0060] During the charge and discharge process of the battery, since energy cannot be completely converted, it is necessary to multiply by the energy conversion rate α, and α is obtained by fitting historical data.

[0061] In step S20, the calculation formula for the protection temperature C is as follows:

[0062] C = a * D, where 0 < a < 1.

[0063] The value of a is 0.9.

[0064] Step S30 specifically includes:

[0065] Step S31: Respectively determine whether the temperature E, temperature F, or temperature G is greater than the theoretical temperature B. If so, proceed to step S32; if not, continue to monitor.

[0066] Step S32: Respectively determine whether the temperature E, temperature F, or temperature G is greater than the protection temperature C. If so, proceed to step S33; if not, pop up a prompt that the temperature is about to exceed the limit, and control the indicator light to turn yellow for prompt.

[0067] Step S33: Respectively determine whether the temperature E, temperature F, or temperature G is greater than the warning temperature D. If so, stop the battery charging and discharging, disconnect the charging and discharging circuit, control the indicator light to turn red for prompt, control the buzzer to alarm, and trigger the fire protection system; if not, stop the battery charging and discharging, disconnect the charging and discharging circuit, control the indicator light to turn red for prompt, and control the buzzer to alarm.

[0068] Step S40 is specifically as follows:

[0069] Set a first ratio and a second ratio; the values of the first ratio and the second ratio are preferably 10%.

[0070] Judge whether the temperature G of an individual connector is higher than the first ratio of the average value of the temperature G at the same time. If so, it means that the corresponding connector is not tightened; if not, it means that all connectors are tightened.

[0071] Judge whether each temperature G is higher than the second ratio of the historical average value. If so, it means that the battery performance is unqualified; if not, it means that the battery performance is qualified.

[0072] Step S50 is specifically as follows:

[0073] Save the temperature E, temperature F, and temperature G, and calculate the upper limit and lower limit of the temperature E, temperature F, and temperature G through the 6sigma algorithm for subsequent big data analysis.

[0074] Based on the same inventive concept, this application provides an electronic device embodiment corresponding to Embodiment 1. For details, see Embodiment 2.

[0075] Embodiment 2

[0076] This embodiment provides a battery temperature monitoring device, as Figure 2 shown, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, any implementation manner in Embodiment 1 can be realized.

[0077] Since the electronic device introduced in this embodiment is the device adopted for implementing the method in Embodiment 1 of the present application, based on the method introduced in Embodiment 1 of the present application, those skilled in the art can understand the specific implementation manners and various variation forms of the electronic device in this embodiment. Therefore, the specific implementation of how this electronic device realizes the method in the embodiments of the present application will not be described in detail herein. As long as the device adopted by those skilled in the art to implement the method in the embodiments of the present application belongs to the scope protected by the present application.

[0078] Based on the same inventive concept, the present application provides a storage medium corresponding to Embodiment 1, as detailed in Embodiment 3.

[0079] Embodiment 3

[0080] This embodiment provides a battery temperature monitoring medium, as Figure 3 shown, on which a computer program is stored. When the computer program is executed by a processor, any implementation manner in Embodiment 1 can be realized.

[0081] The technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0082] 1. By the BMS, the temperature E of the battery is obtained in real time, and by the thermal imaging device, the temperature F of each high-voltage joint, the temperature G of each connector, and the ambient temperature A are obtained in real time. Using the theoretical temperature B, the protection temperature C, and the alarm temperature D, the temperature E, the temperature F, and the temperature G are monitored in real time and hierarchical alarm control is performed, that is, the temperature of multiple areas of the battery is monitored from three dimensions of the theoretical temperature B, the protection temperature C, and the alarm temperature D, thereby greatly improving the comprehensiveness of battery temperature monitoring, further greatly reducing the risk of battery thermal runaway, and greatly improving the safety.

[0083] 2. By recording and archiving the content captured by the thermal imaging device, it is convenient for later traceability to quickly locate the cause of thermal runaway. And by removing the sound in the video, reducing the bit rate and the number of video frames of the video and compressing it into a rar file, the size of the video is greatly reduced, and the same storage space can store videos for a longer time.

[0084] 3. By comparing and analyzing the temperature G of each connector at the same moment with the average value at the same moment, and comparing and analyzing the temperature G with the historical average value, it can quickly judge whether the connector is tightened and whether the battery performance is qualified, further improving the safety.

[0085] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0086] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0087] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing devices to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implement the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0088] These computer program instructions can also be loaded onto a computer or other programmable data processing devices, so that a series of operation steps are executed on the computer or other programmable devices to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable devices provide steps for implementing the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0089] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we described are illustrative rather than used to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be covered by the scope of the claims of the present invention.

Claims

1. A battery temperature monitoring method, characterized in that: It includes the following steps: Step S10: Obtain the temperature E of the battery in real time through the BMS, obtain the temperature F of each high-voltage joint, the temperature G of each connector, and the ambient temperature A in real time through a thermal imaging device, and record and archive the content captured by the thermal imaging device; Step S20: Calculate the theoretical temperature B of the battery after charge and discharge based on the ambient temperature A, obtain the warning temperature D based on the type of battery, and calculate the protection temperature C based on the warning temperature D; Step S30: Monitor the temperature E, temperature F, and temperature G in real time based on the theoretical temperature B, protection temperature C, and warning temperature D; Step S40: Monitor the contact state of the connector and the battery performance in real time based on the temperature G; Step S50: Save the temperature E, temperature F, and temperature G.

2. A battery temperature monitoring method according to claim 1, characterized in that: In the step S10, the recording and archiving of the content captured by the thermal imaging device specifically is: Record the content captured by the thermal imaging device, remove the sound in the generated video, reduce the bit rate and the number of video frames of the video, and compress it into a rar file for archiving.

3. A battery temperature monitoring method according to claim 1, characterized in that: In the step S20, the calculation formula of the theoretical temperature B is: B = I 2 Rt / (c*m)*α + A; Wherein, I represents the current value of charge and discharge; R represents the resistance; t represents the charge and discharge time; c represents the specific heat capacity of the battery; m represents the mass of the battery; α represents the energy conversion rate.

4. A battery temperature monitoring method according to claim 1, characterized in that: In the step S20, the calculation formula of the protection temperature C is: C = a * D, 0 < a < 1.

5. A battery temperature monitoring method according to claim 4, characterized in that: The value of a is 0.

9.

6. A battery temperature monitoring method according to claim 1, characterized in that: The step S30 specifically includes: Step S31: Determine whether the temperature E, temperature F, or temperature G is greater than the theoretical temperature B respectively. If so, enter step S32; if not, continue monitoring; Step S32: Determine whether the temperature E, temperature F, or temperature G is greater than the protection temperature C respectively. If so, enter step S33; if not, pop up a window to prompt that the temperature is about to exceed the limit, and control the indicator light to turn yellow for prompt; Step S33: Determine whether the temperature E, temperature F, or temperature G is greater than the warning temperature D respectively. If so, stop the battery charge and discharge, disconnect the charge and discharge circuit, control the indicator light to turn red for prompt, control the buzzer to alarm, and trigger the fire protection system; if not, stop the battery charge and discharge, disconnect the charge and discharge circuit, control the indicator light to turn red for prompt, and control the buzzer to alarm.

7. A battery temperature monitoring method according to claim 1, characterized in that: The step S40 specifically is: Set a first ratio and a second ratio; Determine whether, at the same time, the temperature G of an individual connector is higher than the first ratio of the average value of the temperature G. If so, it indicates that the corresponding connector is not tightened; if not, it indicates that all connectors are tightened. Determine whether each of the temperatures G is higher than the second ratio of the historical average value. If so, it indicates that the battery performance is unqualified; if not, it indicates that the battery performance is qualified.

8. A battery temperature monitoring method according to claim 1, characterized in that: The step S50 is specifically: Save the temperature E, temperature F, and temperature G, and calculate the upper limit value and the lower limit value of the temperature E, temperature F, and temperature G through the 6sigma algorithm.

9. A battery temperature monitoring device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, when the processor executes the program, it implements the method according to any one of claims 1 to 8.

10. A battery temperature monitoring medium, on which a computer program is stored, characterized in that, when the program is executed by the processor, it implements the method according to any one of claims 1 to 8.

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