A method and system for handling battery thermal runaway and an electric vehicle

Abstract

The present invention provides a method and system for dealing with battery thermal runaway and an electric vehicle. The method for dealing with battery thermal runaway includes: controlling a cooling and fire-retardant nozzle corresponding to a battery point with abnormal temperature to spray a fire-retardant and freezing liquid; disconnecting the connection of the battery disposed at the battery point with abnormal temperature. When the battery has thermal runaway, the present invention performs precise cooling and disconnects the battery connection to deal with the thermal runaway event and prevent it from developing into spontaneous combustion of battery cells.

Description

Technical Field

[0001] The present invention relates to the technical field of battery processing control for electric vehicles, and particularly relates to a method and system for handling battery thermal runaway and an electric vehicle. Background Art

[0002] An electric vehicle refers to a vehicle that uses an on-vehicle power source and drives the wheels with an electric motor, meeting the requirements of road traffic and safety regulations. Due to its relatively smaller impact on the environment compared to traditional vehicles, its prospects are widely optimistic.

[0003] The battery pack serves as the sole power source for the vehicle's drive system. Due to the existence of the internal resistance of the batteries in the battery pack, heat is generated during operation. Especially when the battery malfunctions, factors such as an increase in internal resistance will also cause an increase in the heat generated, leading to thermal runaway. Battery thermal runaway refers to a chain reaction that occurs inside the battery. One damaged battery cell begins to release energy in the form of heat, resulting in extremely high temperatures due to chemical reactions and the sudden release of stored energy. If not controlled, the heat generated may cause a fire because the uncontrolled heat accumulation will lead to further damage, forming what is called "runaway". In this continuous "runaway" cycle, heat accelerates the reaction, generating more heat and gas, and so on. If the inducing factors are not alleviated, a domino effect will occur in adjacent batteries, continuing this pattern. Eventually, toxic gases are discharged through the explosion cap of the battery or when the soft pack battery ruptures. In the black cloud of metal dust particles released from the cathode, followed by a white vapor cloud, because the gas also contains drops of solvent. As oxygen mixes with the vapor, heat continues to accumulate, and the battery cell may even ignite. Therefore, there is an urgent need for a method for handling battery thermal runaway to deal with battery thermal runaway events and prevent thermal runaway from developing into spontaneous combustion of battery cells. Summary of the Invention

[0004] One of the purposes of the present invention is to provide a method for handling battery thermal runaway, which can accurately cool down when the battery undergoes thermal runaway and disconnect the battery connection to handle the thermal runaway event and prevent it from developing into spontaneous combustion of battery cells.

[0005] A method for handling battery thermal runaway provided by an embodiment of the present invention includes:

[0006] Controlling a cooling nozzle corresponding to the battery point with abnormal temperature to spray a flame-retardant freezing liquid;

[0007] Disconnecting the connection of the battery at the battery point with abnormal temperature.

[0008] Preferably, a plurality of cooling nozzles are configured and arranged in an array above the battery pack.

[0009] Preferably, the steps for determining the battery points with abnormal temperature are as follows:

[0010] Monitor the temperature values through temperature sensors set at various positions of the battery pack;

[0011] When the temperature value is greater than the preset temperature threshold, the position where the temperature sensor is set is used as the battery point with abnormal temperature.

[0012] Preferably, the control steps for the cooling spray nozzles are as follows:

[0013] Allocate the liquid output volume according to the temperature difference between the temperature of the corresponding battery point with abnormal temperature and the temperature threshold.

[0014] Preferably, disconnecting the access of the battery is achieved through normally open control points set at the battery access points.

[0015] The present invention also provides a battery thermal runaway processing system, including:

[0016] A control module, configured to control the cooling spray nozzles corresponding to the battery points with abnormal temperature to spray flame-retardant and freezing liquid;

[0017] A disconnection module, configured to disconnect the access of the battery set at the battery point with abnormal temperature.

[0018] Preferably, multiple cooling spray nozzles are configured and arranged in an array above the battery pack.

[0019] Preferably, the steps for determining the battery points with abnormal temperature are as follows:

[0020] Monitor the temperature values through temperature sensors set at various positions of the battery pack;

[0021] When the temperature value is greater than the preset temperature threshold, the position where the temperature sensor is set is used as the battery point with abnormal temperature.

[0022] Preferably, the control steps for the cooling spray nozzles are as follows:

[0023] Allocate the liquid output volume according to the temperature difference between the temperature of the corresponding battery point with abnormal temperature and the temperature threshold.

[0024] Preferably, disconnecting the access of the battery is achieved through normally open control points set at the battery access points.

[0025] The present invention also provides an electric vehicle, including: multiple cooling spray nozzles arranged in an array above the battery pack and normally open control points set at each battery access point;

[0026] The temperature inside the battery pack is monitored by the temperature values monitored by the temperature sensors set at various positions of the battery pack. When a temperature anomaly point is determined, a flame-retardant freezing liquid is sprayed through the corresponding cooling nozzle, and the access of the battery is disconnected through the normally open control point of the battery with the corresponding temperature anomaly.

[0027] Other features and advantages of the present invention will be described in the following specification, and in part will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the written specification and the drawings.

[0028] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0029] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0030] Figure 1 It is a schematic diagram of a method for handling battery thermal runaway in an embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of another method for handling battery thermal runaway in an embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of a battery thermal runaway handling system in an embodiment of the present invention. Detailed Embodiments

[0033] The following describes the preferred embodiments of the present invention with reference to the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0034] Embodiment 1

[0035] The embodiment of the present invention provides a method for handling battery thermal runaway, as Figure 1 shown, including:

[0036] Step 1: Control the cooling nozzle corresponding to the battery point with abnormal temperature to spray a flame-retardant freezing liquid;

[0037] The control difficulty in Step 1 is the determination of the battery points with abnormal temperature. To accurately determine the battery points with abnormal temperature, the determination steps are as follows: Monitor the temperature values through the temperature sensors set at various positions of the battery pack; when the temperature value is greater than the preset temperature threshold, set the position where the temperature sensor is located as the battery point with abnormal temperature. In addition, to achieve a better spraying and cooling and flame retardant effect, multiple cooling nozzles are configured and arranged in an array above the battery pack to cope with the cooling and flame retardant when any battery at any position in the battery pack has an abnormality; to achieve precise control of the cooling nozzles, the control steps are as follows: Allocate the liquid output according to the temperature difference between the temperature of the corresponding battery point with abnormal temperature exceeding the temperature threshold.

[0038] Step 2: Disconnect the access of the battery set at the battery point with abnormal temperature.

[0039] The disconnection of the battery access is achieved through the normally open control points set at the battery access points. That is, a normally open controller is configured at the access point of each battery for access control; when the battery fails, the access can be disconnected. The normally open controller is in the off state in the initial state, so when the control circuit is also affected, the disconnection operation of the battery access can be ensured;

[0040] The battery thermal runaway treatment method of this embodiment, when the battery has a thermal runaway, performs precise cooling and disconnects the battery access to handle the thermal runaway event and prevent it from developing into spontaneous combustion of the battery unit.

[0041] In addition, as Figure 2 shown, in order to monitor and cool the temperature of each battery cell, the temperature sensor 12 and the cooling nozzle 13 can be configured in a one-to-one correspondence with the battery cell 11. In this way, when an abnormality is detected by a certain temperature sensor 12, the abnormal battery cell 11 can be directly determined. After the abnormal battery cell 11 is determined, the access of the battery cell 11 is disconnected by disconnecting the normally open controller 14, and the corresponding cooling nozzle 13 is used to spray the refrigerating medium.

[0042] Embodiment 2

[0043] On the basis of Embodiment 1, to simplify the control of the cooling nozzles, when configuring the temperature sensors and the cooling nozzles, each temperature sensor in the temperature sensor array is configured between each battery in the battery pack and in the middle area of the battery, so that when the battery has a thermal runaway, it can be monitored alternately; the cooling nozzles are configured in a one-to-one correspondence with each temperature sensor in the temperature sensor array and are arranged above the corresponding temperature sensors, so that the cooling nozzles form a cooling nozzle array above the battery pack.

[0044] When specifically dealing with the situation where only one temperature sensor detects abnormal temperature, the set point of this temperature sensor is used as the battery point with abnormal temperature. At this time, there is no need to perform distribution control among multiple cooling nozzles. The control of the cooling nozzles can query the pre-configured corresponding table of temperature and ejection volume according to the temperature of the corresponding temperature sensor to determine the ejection volume. Since the environments (such as the shortest distance to the outside world) are different at different positions, different corresponding tables of temperature and ejection volume can be adaptively configured according to the different set positions of the temperature sensors. The closer the temperature sensor is to the boundary of the battery pack, the lower the ejection volume at the same temperature. In addition, since the effects of the same ejection volume are different due to the different outside environmental temperatures, the ejection volume correction coefficient can be determined by querying the pre-configured correction coefficient table corresponding to each temperature sensor according to the outside environmental temperature, and the ejection volume of each cooling nozzle is corrected based on the ejection volume correction coefficient. The corrected ejection volume is the product of the correction coefficient and the original ejection volume.

[0045] Among them, the ejection volume correction coefficients in the correction coefficient table are in one-to-one correspondence with the outside environmental temperature; and the correction coefficient tables corresponding to each temperature sensor are different. For example, when corresponding to the standard temperature (such as 20 degrees Celsius), the correction coefficient is zero; when the temperature exceeds the standard temperature and is the same, the closer the temperature sensor is to the boundary of the battery pack, the larger the correction coefficient, and at this time the correction coefficient is positive; when the temperature is lower than the standard temperature and is the same, the closer the temperature sensor is to the boundary of the battery pack, the smaller the correction coefficient, and at this time the correction coefficient is negative. The corresponding table of temperature and ejection volume is pre-configured, and the temperature and ejection volume are in corresponding association in the table.

[0046] In this embodiment, the temperature sensors and the cooling nozzles are arranged in one-to-one correspondence and vertically, which is convenient for the control of the cooling nozzles. To ensure the realization of the cooling function of the cooling nozzles, the cooling nozzles are connected with electric control valves, the electric control valves are connected to the delivery pump group, and the delivery pump group is connected to the flame retardant and coolant storage tank or directly connected to the flame retardant and coolant of the engine. When connected to the flame retardant and coolant of the engine, it is directly extracted for thermal runaway treatment during thermal runaway.

[0047] At this time, it is necessary to disconnect the batteries in the affected area corresponding to the abnormal temperature sensor among the connected batteries. The affected area is determined through the following steps: Connect the temperature sensors arranged in an array in pairs to form a grid; this grid divides the battery pack into multiple areas, and the area covered by the center points of the four areas with the abnormal temperature sensor as the endpoints is the affected area corresponding to the abnormal temperature sensor.

[0048] Embodiment 3

[0049] Based on Embodiment 2, since the actually occurring abnormal battery can be any one in the influence area corresponding to the abnormal temperature sensor, when performing single-point thermal runaway treatment, the cooling spray head has the best treatment effect when spraying on the source of thermal runaway. Therefore, in this embodiment, the cooling spray head is arranged on a two-axis cloud platform to realize the rotation of the cooling spray head in the plane and the adjustment of the angle; at this time, it is necessary to locate the central position of the thermal runaway. The specific location can be determined by analyzing the monitored temperatures of the temperature sensors around the abnormal temperature sensor. After positioning, the spraying angle and direction corresponding to the cooling spray head can be controlled according to the positioning to achieve precise spraying; this embodiment uses a pre-configured first analysis and control library to simplify the positioning control process. Specifically: extract the temperature of the abnormal temperature sensor and the monitored temperatures of the surrounding temperature sensors, calculate the average value of the extracted temperatures, then calculate the difference between the monitored temperature and the average value respectively, and sort the calculated differences according to the serial number order corresponding to the temperature sensors to form an analysis data set; according to the analysis data set, extract the first control parameter set from the pre-configured first analysis and control library, and control the movement of the two-axis cloud platform according to the first control parameter set; among them, the analysis data set in the first analysis and control library is in one-to-one correspondence with the first control parameter set, and the first analysis and control library is pre-configured; the first control parameter set includes: the horizontal deflection angle and the vertical deflection angle of the two-axis cloud platform.

[0050] Embodiment 4

[0051] Based on Embodiment 1, in order to achieve efficient processing of the abnormality of a monitored temperature sensor point, when configuring the temperature sensors to form an array, the positions of adjacent temperature sensors are connected to form a segmentation grid, and the segmentation grid divides the battery pack into multiple grid areas, and a cooling spray head is configured above the central position of the grid area; and the cooling spray head is arranged on a two-axis cloud platform; through the above configuration, when a single temperature sensor monitors an abnormality, at least four cooling spray heads around the temperature sensor can be mobilized to perform precise spraying on this position;

[0052] To achieve precise spraying, it is still necessary to locate the central position of thermal runaway. After positioning, the spraying angle and direction of the corresponding cooling nozzle can be controlled according to the positioning to achieve precise spraying. In this embodiment, a pre-configured second analysis and control library is used to simplify the positioning control process. Specifically: extract the temperature of the abnormal temperature sensor and the monitored temperatures of the surrounding temperature sensors, calculate the average value of the extracted temperatures, then calculate the differences between the monitored temperatures and the average value respectively, and sort the calculated differences according to the serial numbers of the corresponding temperature sensors to form an analysis data set; according to the analysis data set, extract the second control parameter set from the pre-configured second analysis and control library, and control the two-axis pan-tilt movement of the surrounding cooling nozzles according to the second control parameter set; among them, there is a one-to-one correspondence between the analysis data set and the second control parameter set in the second analysis and control library, and the second analysis and control library is pre-configured; the second control parameter set includes: the horizontal deflection angle and the vertical deflection angle of each two-axis pan-tilt. Specifically, the second control parameter set includes four lines of data, and each line of data corresponds to the horizontal deflection angle and the vertical deflection angle of a two-axis pan-tilt.

[0053] Embodiment 5

[0054] Based on Embodiment 4 or Embodiment 3, when the monitoring data of multiple temperature sensors is abnormal, it indicates that the scope of thermal runaway is relatively wide and the harm is relatively large at this time. Spraying towards the center of the thermal runaway area will drive the heat outward. Therefore, the spraying needs to be divided into two stages. In the first stage, spray the periphery of the thermal runaway area for peripheral isolation, and then gradually spray in the order from the periphery to the center of the thermal runaway area; to achieve the above spraying method, the specific control steps of this embodiment include: construct an analysis space according to the installation positions of the cooling nozzles and temperature sensors; locate the thermal runaway area according to the positions of the abnormal temperature sensors; determine the total spraying amount according to the temperature values of each temperature sensor in the thermal runaway area and the size of the thermal runaway area; determine the cooling nozzles to be controlled according to the thermal runaway area, and control group them according to the distances of the cooling nozzles from the boundary of the thermal runaway area, associate the cooling nozzles with the nearest abnormal temperature sensors on their connection lines towards the center of the thermal runaway area, and construct an allocation data set of the spraying amount according to the control groups of the cooling nozzles and the temperature values of the associated temperature sensors; retrieve the allocation coefficient set from the pre-configured allocation library according to the allocation data set; determine the allocation coefficient of each cooling nozzle according to the allocation coefficient set; determine the spraying amount of each cooling nozzle according to the allocation coefficient of each cooling nozzle and the total spraying amount (the spraying amount is the product of the allocation coefficient and the total spraying amount); determine the spraying order according to the control groups; the time intervals between the spraying of each group can be pre-configured;

[0055] Among them, the thermal runaway area is the area composed of all the divided areas with the abnormal temperature sensors as endpoints;

[0056] The steps for determining the total injection volume include: calculating the average value of the temperature values, querying a pre-configured total injection volume determination table based on the average value and the area of the thermal runaway region, and determining the total injection volume; wherein, the total injection volume determination table is pre-configured, and the average value, area, and total injection volume in the table are correspondingly associated;

[0057] The grouping rules for the control groups include: taking the direction from the center of the thermal runaway region to the cooling cold spray head as the positive direction. In this way, the distance from the cooling cold spray head outside the thermal runaway region to the boundary is negative, and the distance from the cooling cold spray head inside the thermal runaway region to the boundary is positive; those with negative values are divided into the first group; then, the diagonal length of the divided region is used as a scale for grouping the positive values. Those with positive values within the range of 0 to the diagonal length are divided into the second group, and those within the range of one diagonal length to two diagonal lengths are divided into the third group, and so on for grouping. The injection order is from the first group to the last group;

[0058] Each row of data in the injection volume allocation dataset corresponds to the temperature value of the temperature sensor associated with a control group; the data within the row is arranged according to the order of the codes corresponding to the cooling cold spray heads, and when arranged, the blank data is filled with a pre-configured filling value; the allocation coefficient set in the allocation library is correspondingly associated with the allocation dataset one by one; the data in the allocation coefficient set is arranged according to the data corresponding to the cooling cold spray heads corresponding to the parameters in the allocation dataset. In this way, by disassembling the allocation coefficient set, the allocation coefficients corresponding to each cooling cold spray head can be obtained;

[0059] In addition, when the storage volume of the flame retardant freezing liquid is less than or equal to the total injection volume, the injection volume of each cooling cold spray head is allocated according to the storage volume.

[0060] Embodiment 6

[0061] The present invention also provides a battery thermal runaway processing system, as Figure 3 shown, including:

[0062] A control module 1, configured to control the cooling cold spray head corresponding to the temperature-abnormal battery point to spray the flame retardant freezing liquid;

[0063] A disconnection module 2, configured to disconnect the access of the battery provided at the temperature-abnormal battery point.

[0064] Among them, multiple cooling cold spray heads are configured and arranged in an array above the battery pack.

[0065] The steps for determining the temperature-abnormal battery point are as follows:

[0066] Monitor the temperature values through the temperature sensors provided at various positions of the battery pack;

[0067] When the temperature value is greater than the preset temperature threshold, the position set by the temperature sensor is used as the temperature-abnormal battery point.

[0068] The control steps of the cooling cold nozzle are as follows:

[0069] The liquid output is allocated according to the temperature difference by which the temperature of the corresponding temperature-abnormal battery point exceeds the temperature threshold.

[0070] The connection of the battery is disconnected through the normally open control point set at the battery connection point.

[0071] Embodiment 7

[0072] The present invention also provides an electric vehicle, including: a plurality of cooling cold nozzles arranged in an array above the battery pack and normally open control points arranged at each battery connection point;

[0073] The temperature inside the battery pack is monitored by the temperature values monitored by the temperature sensors arranged at various positions of the battery pack. When a temperature-abnormal point is determined, a flame-retardant freezing liquid is sprayed through the correspondingly arranged cooling cold nozzle, and the connection of the battery is disconnected through the normally open control point of the corresponding temperature-abnormal battery.

[0074] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A method for dealing with battery thermal runaway, characterized in that, Including: Controlling a cooling nozzle corresponding to a battery point with abnormal temperature to eject a flame-retardant freezing liquid; Disconnecting the access of the battery arranged at the battery point with abnormal temperature; Wherein, the temperature sensors and the cooling nozzles are configured in a one-to-one correspondence with the battery cells; a plurality of cooling nozzles are configured and arranged in an array above the battery pack; When specifically dealing with the situation where only one temperature sensor detects abnormal temperature, taking the setting position of the temperature sensor as the battery point with abnormal temperature, controlling the cooling nozzle to determine the ejection amount by querying the pre-configured corresponding table of temperature and ejection amount according to the temperature of the corresponding temperature sensor; adaptively configuring different corresponding tables of temperature and ejection amount according to the different setting positions of the temperature sensors; querying the pre-configured correction coefficient table corresponding to each temperature sensor through the ambient temperature to determine the ejection amount correction coefficient, and correcting the ejection amount of each cooling nozzle according to the ejection amount correction coefficient; the corrected ejection amount is the product of the correction coefficient and the original ejection amount; The battery whose access needs to be disconnected is the battery in the affected area corresponding to the abnormal temperature sensor, and the affected area is determined through the following steps: connecting the temperature sensors arranged in an array in pairs to form a grid; the grid divides the battery pack into multiple areas, and the area covered by taking the center points of the four areas with the abnormal temperature sensor as endpoints as endpoints is the affected area corresponding to the abnormal temperature sensor.

2. The battery thermal runaway treatment method according to claim 1, characterized in that The determination steps of the battery point with abnormal temperature are as follows: Monitoring the temperature value through the temperature sensors arranged at various positions of the battery pack; When the temperature value is greater than the preset temperature threshold, taking the setting position of the temperature sensor as the battery point with abnormal temperature.

3. The battery thermal runaway handling method according to claim 1, wherein, Disconnecting the access of the battery is realized through the normally open control points arranged at the battery access points.

4. A battery thermal runaway treatment system, characterized in that, Including: A control module for controlling a cooling nozzle corresponding to a battery point with abnormal temperature to eject a flame-retardant freezing liquid; A disconnection module for disconnecting the access of the battery arranged at the battery point with abnormal temperature; Wherein, the temperature sensors and the cooling nozzles are configured in a one-to-one correspondence with the battery cells; a plurality of cooling nozzles are configured and arranged in an array above the battery pack; When specifically dealing with the situation where only one temperature sensor detects abnormal temperature, taking the setting position of the temperature sensor as the battery point with abnormal temperature, controlling the cooling nozzle to determine the ejection amount by querying the pre-configured corresponding table of temperature and ejection amount according to the temperature of the corresponding temperature sensor; adaptively configuring different corresponding tables of temperature and ejection amount according to the different setting positions of the temperature sensors; querying the pre-configured correction coefficient table corresponding to each temperature sensor through the ambient temperature to determine the ejection amount correction coefficient, and correcting the ejection amount of each cooling nozzle according to the ejection amount correction coefficient; the corrected ejection amount is the product of the correction coefficient and the original ejection amount; The battery that needs to have its connection disconnected is the battery in the affected area corresponding to the abnormal temperature sensor. The affected area is determined through the following steps: Connect the temperature sensors arranged in an array in pairs to form a grid; the grid divides the battery pack into multiple areas, and the area covered by taking the centers of the four areas with the abnormal temperature sensor as endpoints as endpoints is the affected area corresponding to the abnormal temperature sensor.

5. The battery thermal runaway treatment system according to claim 4, wherein, The steps for determining the temperature-abnormal battery points are as follows: Monitor the temperature values through the temperature sensors set at various positions of the battery pack; When the temperature value is greater than the preset temperature threshold, set the position where the temperature sensor is located as the temperature-abnormal battery point.

6. An electric vehicle, characterized in that, Including: Multiple cooling spray nozzles arranged in an array above the battery pack and normally open control points set at each battery connection point; Monitor the temperature inside the battery pack through the temperature values monitored by the temperature sensors set at various positions of the battery pack. When a temperature-abnormal point is determined, spray the flame-retardant freezing liquid through the corresponding cooling spray nozzles, and disconnect the connection of the battery through the normally open control point of the corresponding temperature-abnormal battery; among them, the temperature sensors and the cooling spray nozzles are configured in a one-to-one correspondence with the battery cells; multiple cooling spray nozzles are configured and arranged in an array above the battery pack; When specifically dealing with the situation where only one temperature sensor monitors a temperature abnormality, set the position where the temperature sensor is located as the temperature-abnormal battery point. Query the pre-configured temperature and spray amount correspondence table according to the temperature of the corresponding temperature sensor to control the cooling spray nozzles to determine the spray amount; configure different temperature and spray amount correspondence tables adaptively according to the different settings of the temperature sensors; query the pre-configured correction coefficient table corresponding to each temperature sensor according to the temperature of the external environment to determine the spray amount correction coefficient, and correct the spray amount of each cooling spray nozzle according to the spray amount correction coefficient; the corrected spray amount is the product of the correction coefficient and the original spray amount. The battery that needs to have its connection disconnected is the battery in the affected area corresponding to the abnormal temperature sensor. The affected area is determined through the following steps: Connect the temperature sensors arranged in an array in pairs to form a grid; the grid divides the battery pack into multiple areas, and the area covered by taking the centers of the four areas with the abnormal temperature sensor as endpoints as endpoints is the affected area corresponding to the abnormal temperature sensor.

Images