Battery pack temperature monitoring method and related apparatus

Abstract

The embodiment of the application provides a battery pack temperature monitoring method and related device, a plurality of temperature sensors are arranged in the battery pack; the method comprises the following steps: in the case that it is determined that there is a first temperature sensor with suspected temperature detection abnormality based on a first temperature collected by the temperature sensor, using a second temperature sensor to perform temperature monitoring on the battery pack, and determining again whether the temperature detection of the first temperature sensor is abnormal based on a second temperature collected by the first temperature sensor; the second temperature sensor is a temperature sensor except the first temperature sensor in the plurality of temperature sensors; if there is no abnormality, using the first temperature sensor and the second temperature sensor to perform temperature monitoring on the battery pack. Through the above manner, the accuracy of identifying whether the temperature sensor in the battery pack is abnormal can be effectively improved, and the probability of error in temperature monitoring of the battery pack is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery pack, and particularly relates to a battery pack temperature monitoring method and related device. BACKGROUND

[0002] The safety of a battery pack, as a core component of a new energy vehicle, is crucial. Since the temperature of the battery pack is related to its safety, the temperature of the battery pack needs to be monitored at all times during driving.

[0003] In the related art, a battery management system (BMS) of a vehicle can monitor the temperature of a battery pack through a negative temperature coefficient (NTC) sensor arranged in the battery pack.

[0004] However, when the NTC sensor is abnormal, the temperature of the battery pack monitored based on the NTC sensor will be incorrect. Therefore, how to accurately identify whether the NTC sensor is abnormal and avoid incorrect temperature monitoring of the battery pack has become a problem to be solved by those skilled in the art. SUMMARY

[0005] Embodiments of the present application provide a battery pack temperature monitoring method and related device, which can effectively improve the accuracy of identifying whether a temperature sensor is abnormal and reduce the probability of incorrect temperature monitoring of the battery pack.

[0006] In a first aspect, embodiments of the present application provide a battery pack temperature monitoring method applied to a battery management system, wherein a plurality of temperature sensors are arranged in a battery pack, and different temperature sensors are used to collect the temperature of different regions of the battery pack; the method comprises:

[0007] In a case where it is determined based on a first temperature collected by the temperature sensor that there is a first temperature sensor with suspected temperature detection abnormality, using a second temperature sensor to monitor the temperature of the battery pack, and based on a second temperature collected by the first temperature sensor, determining again whether the temperature detection of the first temperature sensor is abnormal; the second temperature sensor is a temperature sensor other than the first temperature sensor in the plurality of temperature sensors;

[0008] If there is no abnormality, using the first temperature sensor and the second temperature sensor to monitor the temperature of the battery pack.

[0009] In some embodiments, the step of determining again whether the temperature detection of the first temperature sensor is abnormal based on the second temperature collected by the first temperature sensor comprises:

[0010] In a case where the second temperature meets a first preset condition, it is determined that the temperature detection of the first temperature sensor is abnormal, and in a case where the second temperature does not meet the first preset condition, it is determined that the temperature detection of the first temperature sensor is normal.

[0011] The first preset condition includes at least one of the following:

[0012] The second temperature jumps, and a jump amplitude is greater than a preset value, and a jump number is greater than a preset number.

[0013] The second temperature continuously rises or continuously falls, and a continuously rising or continuously falling amplitude is greater than a preset amplitude.

[0014] The second temperature is less than or equal to a first temperature threshold value.

[0015] In some embodiments, the first temperature sensor with suspected temperature detection abnormality is determined based on the first temperature collected by the temperature sensor, including:

[0016] In a case where the battery pack starts heat management, when the first temperature meets a second preset condition, it is determined that the first temperature sensor with suspected temperature detection abnormality exists.

[0017] The second preset condition includes at least one of the following:

[0018] A maximum value in the plurality of first temperatures is greater than a second temperature threshold value, and a fourth difference value between at least one first temperature and an average value of the plurality of first temperatures is greater than a third temperature threshold value.

[0019] A minimum value of the plurality of first temperatures is less than a fourth temperature threshold value, and a fifth difference value between an average value of the plurality of first temperatures and at least one first temperature is greater than the third temperature threshold value.

[0020] In some embodiments, the first temperature sensor with suspected temperature detection abnormality is determined based on the first temperature collected by the temperature sensor, including:

[0021] In a case where the battery pack does not start heat management, when the first temperature meets a third preset condition, it is determined that the first temperature sensor with suspected temperature detection abnormality exists.

[0022] The third preset condition includes at least one of the following:

[0023] A maximum value in the plurality of first temperatures is greater than the second temperature threshold value, and a sixth difference value between at least one first temperature and an average value of the plurality of first temperatures is greater than a fifth temperature threshold value; the fifth temperature threshold value is greater than the third temperature threshold value.

[0024] The minimum value of the plurality of first temperatures is less than the fourth temperature threshold, and the seventh difference value of the mean value of the plurality of first temperatures and at least one first temperature is greater than the fifth temperature threshold.

[0025] In some embodiments, the method further comprises:

[0026] If the number of first temperature sensors with temperature detection abnormalities is greater than a preset number, first alarm information is output; the first alarm information is used to indicate that temperature monitoring of the battery pack is abnormal.

[0027] In some embodiments, the method further comprises:

[0028] According to the temperature collected by the first temperature sensor with temperature detection abnormalities, the cell voltage of the battery pack, and the number of broken wires between the battery pack and the battery management system, the battery pack is managed in thermal runaway.

[0029] In some embodiments, the management of the battery pack in thermal runaway according to the temperature collected by the first temperature sensor with temperature detection abnormalities, the cell voltage of the battery pack, and the number of broken wires between the battery pack and the battery management system comprises:

[0030] If the temperature collected by the first temperature sensor with temperature detection abnormalities is greater than a sixth temperature threshold, the cell voltage or the number of broken wires is obtained;

[0031] If any cell voltage is less than a preset voltage, or the number of broken wires is greater than or equal to a preset number, it is determined that the battery pack has a risk of thermal runaway, and thermal runaway risk alarm information is output.

[0032] In some embodiments, the method further comprises:

[0033] After the battery pack management system is powered on again, a third temperature collected by the first temperature sensor with temperature detection abnormalities before the last power failure is obtained.

[0034] If the difference between the third temperature and the mean value of the temperatures collected by the plurality of temperature sensors is less than a seventh temperature threshold, it is determined that the first temperature sensor with temperature detection abnormalities has returned to normal.

[0035] In a second aspect, the embodiments of the present application provide a battery pack temperature monitoring device applied to a battery pack management system, a plurality of temperature sensors are arranged in the battery pack, and different temperature sensors are used to collect temperatures of different regions of the battery pack; the device comprises:

[0036] The processing module is configured to, in a case where it is determined based on the first temperature collected by the temperature sensor that there is a first temperature sensor with suspected temperature detection abnormality, use a second temperature sensor to monitor the temperature of the battery pack, and determine again whether the temperature detection of the first temperature sensor is abnormal based on a second temperature collected by the first temperature sensor, the second temperature sensor being a temperature sensor other than the first temperature sensor among the plurality of temperature sensors.

[0037] The monitoring module is configured to, in a case where there is no abnormality, use the first temperature sensor and the second temperature sensor to monitor the temperature of the battery pack.

[0038] In a third aspect, the present application provides a battery pack management system, comprising a memory and a processor.

[0039] The memory is configured to store computer instructions, and the processor is configured to execute the computer instructions stored in the memory to implement the method of any one of the first aspect.

[0040] In a fourth aspect, the present application provides a vehicle, wherein the vehicle is provided with the battery pack management system of the third aspect.

[0041] In a fifth aspect, the present application provides a computer-readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the method of any one of the first aspect.

[0042] In a sixth aspect, the present application provides a computer program product, comprising a computer program, which is executed by a processor to implement the method of any one of the first aspect.

[0043] The battery pack temperature monitoring method and related device provided by the embodiments of the present application are applied to a battery pack management system, wherein a plurality of temperature sensors are arranged in the battery pack, and different temperature sensors are used to collect the temperature of different regions of the battery pack. The method comprises the following steps: in a case where it is determined based on a first temperature collected by a temperature sensor that there is a first temperature sensor with suspected temperature detection abnormality, using a second temperature sensor to monitor the temperature of the battery pack, and determining again whether the temperature detection of the first temperature sensor is abnormal based on a second temperature collected by the first temperature sensor, the second temperature sensor being a temperature sensor other than the first temperature sensor among the plurality of temperature sensors; and in a case where there is no abnormality, using the first temperature sensor and the second temperature sensor to monitor the temperature of the battery pack. In this way, the accuracy of identifying whether the temperature sensor in the battery pack is abnormal can be effectively improved, and the probability of error in temperature monitoring of the battery pack can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1A scene schematic diagram provided by an embodiment of the present application;

[0045] Figure 2 A flowchart of a battery pack temperature monitoring method provided by an embodiment of the present application;

[0046] Figure 3 A structure schematic diagram of a battery pack temperature monitoring device provided by an embodiment of the present application;

[0047] Figure 4 A structure schematic diagram of a battery pack management system provided by an embodiment of the present application;

[0048] Figure 5 A structure schematic diagram of a vehicle provided by an embodiment of the present application. DETAILED DESCRIPTION

[0049] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0050] In the embodiments of the present application, the terms such as “first”, “second”, etc. are used to distinguish the same items or similar items with basically the same functions and effects, and do not limit the sequence. Those skilled in the art can understand that the terms such as “first”, “second”, etc. do not limit the quantity and execution sequence, and the terms such as “first”, “second”, etc. also do not necessarily mean different.

[0051] It should be noted that in the embodiments of the present application, the words “exemplary” or “for example” are used to represent examples, illustrations, or descriptions. Any embodiment or design scheme described as “exemplary” or “for example” in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words “exemplary” or “for example” are intended to present the relevant concepts in a specific manner.

[0052] As described above, how to accurately identify whether the NTC sensor is abnormal and avoid temperature monitoring errors of the battery pack has become a problem that those skilled in the art urgently need to solve

[0053] In the related art, whether the NTC sensor is abnormal is mostly determined by observing the fluctuation of the temperature collected by each NTC sensor, but the above screening method is not rigorous, and is prone to missed detection or false detection, resulting in low accuracy of temperature monitoring of the battery pack and easily affecting driving safety.

[0054] Therefore, the embodiments of the present application provide a battery pack temperature monitoring method and related device, which can effectively improve the accuracy of temperature monitoring of the battery pack.

[0055] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be implemented independently, or can be combined with each other. For the same or similar concepts or processes, some embodiments can not be described again.

[0056] Figure 1 For the application scenario of the embodiments of the present application, as shown in Figure 1 , it includes a battery pack and a battery pack management system (BMS).

[0057] Among them, the battery pack is provided with a plurality of temperature sensors, and different temperature sensors are used to monitor the temperature of different areas of the battery pack.

[0058] Each temperature sensor can send the collected temperature to the battery management system, and the battery management system manages and warns the battery pack based on the received temperature, such as high and low temperature alarm, thermal management, thermal runaway management, power limitation, etc.

[0059] In some embodiments, the temperature sensor can be an NTC temperature sensor, an infrared temperature sensor, a thermocouple temperature sensor, etc. The type of temperature sensor is not limited in the embodiments of the present application.

[0060] Based on the embodiments shown in Figure 1 , the battery pack management system in Figure 1 is taken as the execution subject to describe the battery pack temperature monitoring method provided by the embodiments of the present application.

[0061] Figure 2 The flowchart of a battery pack temperature monitoring method provided by the embodiments of the present application is shown in Figure 1 , which includes: Figure 2

[0062] S201, in the case where it is determined based on the first temperature collected by the temperature sensor that there is a first temperature sensor with suspected temperature detection abnormality, using a second temperature sensor to monitor the temperature of the battery pack, and based on the second temperature collected by the first temperature sensor, determining again whether the temperature detection of the first temperature sensor is abnormal.

[0063] Among them, the second temperature sensor is a temperature sensor in the plurality of temperature sensors except the first temperature sensor.

[0064] ​In some embodiments, when the battery management system collects the first temperature reported by each temperature sensor in the battery pack, it can determine whether there is a first temperature sensor with suspected temperature detection abnormality according to the first temperature. If it is determined that there is a first temperature sensor with suspected temperature detection abnormality, the temperature reported by the first temperature sensor is temporarily shielded, and the remaining second temperature sensors are used to collect the temperature of the battery pack for temperature monitoring.

[0065] Optionally, temporarily shielding the temperature reported by the first temperature sensor can mean storing the temperature reported by the first temperature sensor in a preset data storage unit, for example, E.

[0066] Since temperature failure is a random event, when it is determined that there is a first temperature sensor with suspected temperature detection abnormality, to avoid the determination abnormality caused by random events, the battery pack management system can re-determine whether the temperature detection of the first temperature sensor is abnormal based on the second temperature collected by the first temperature sensor subsequently.

[0067] S202, if there is no abnormality, the first temperature sensor and the second temperature sensor are used to monitor the temperature of the battery pack.

[0068] In some embodiments, if the battery pack management system re-determines that the temperature detection of the first temperature sensor is abnormal based on the second temperature, it can be determined that the first temperature sensor is abnormal or faulty. During this driving process, the first temperature sensor is shielded, and the remaining second temperature sensors are used to collect the temperature of the battery pack for temperature monitoring, so as to avoid the abnormal temperature reported by the abnormal or faulty first temperature sensor, and to ensure the accuracy of the temperature monitoring of the battery pack.

[0069] If it is re-determined that the temperature detection of the first temperature sensor is not abnormal based on the second temperature, that is, the determination that the temperature detection of the first temperature sensor is abnormal based on the first temperature is a false positive, the shielding of the first temperature sensor can be cancelled, and the first temperature sensor and the second temperature sensor are used to monitor the temperature of the battery pack, thereby improving the comprehensiveness of the temperature monitoring of each region of the battery pack.

[0070] For example, if there are 10 temperature sensors deployed in the battery pack, and it is determined that there are 3 temperature sensors with suspected abnormality based on the first temperature, the remaining 7 temperature sensors are temporarily used to monitor the temperature of the battery pack, and the 3 temperature sensors with suspected abnormality are re-confirmed based on the second temperature. If one of the temperature sensors is a false positive in the re-confirmation, the false positive temperature sensor is restored to monitor the temperature of the battery pack, and the remaining 2 temperature sensors are continuously shielded, that is, 8 (1+7) temperature sensors are used to monitor the temperature of the battery pack, and the remaining 2 temperature sensors with confirmed abnormality are continuously shielded.

[0071] The following describes the process of determining the first temperature sensor with suspected temperature detection abnormality by the battery pack management system and re-determining whether the first temperature sensor is abnormal.

[0072] In some embodiments, the battery pack includes two modes of thermal management on and thermal management off during operation, where thermal management is a process of adjusting and controlling the temperature or temperature difference of the battery pack by using heating or cooling means.

[0073] Due to external heating uniformity problems, the whole pack temperature difference will increase to some extent when the thermal management is on, so there are two different ways for the battery pack management system to determine the first temperature sensor with suspected temperature detection abnormality under the two different modes of thermal management on and thermal management off.

[0074] Mode 1, when the first temperature satisfies the second preset condition, the first temperature sensor with suspected temperature detection abnormality is determined in the case of turning on the thermal management of the battery pack.

[0075] The second preset condition includes at least one of the following:

[0076] 1. The maximum value of the plurality of first temperatures is greater than the second temperature threshold, and the fourth difference between at least one first temperature and the average of the plurality of first temperatures is greater than the third temperature threshold.

[0077] 2. The minimum value of the plurality of first temperatures is less than the fourth temperature threshold, and the fifth difference between the average of the plurality of first temperatures and at least one first temperature is greater than the third temperature threshold.

[0078] For example, when the battery management system collects the first temperature (Tn) reported by each temperature sensor, if the maximum value (Tmax) is greater than 45℃, and there is at least one first temperature with a difference greater than 15℃ from the average of all first temperatures (Tavg) (Tn-Tavg>15℃).

[0079] When the battery management system collects the first temperature (Tn) reported by each temperature sensor, if the minimum value (Tmin) is less than -10℃, and there is a difference greater than 15℃ between the average of all first temperatures (Tavg) and at least one first temperature (Tavg-Tn>15℃). The average of all first temperatures can be the average calculated based on all first temperatures, or the average calculated after excluding the maximum temperature and the minimum temperature.

[0080] When the battery management system determines that there is a first temperature satisfying the above condition in the collected first temperatures, the battery management system can mark the temperature sensor corresponding to the first temperature as a temperature sensor suspected of having a temperature detection abnormality, and temporarily shield the temperature sensor. For example, the battery management system includes 10 temperature sensors, and after analyzing the 10 collected first temperatures, it is determined that 3 first temperatures satisfy the above condition. Then, the 3 first temperatures corresponding to the temperature sensors are marked as first temperature sensors suspected of having a temperature detection abnormality.

[0081] In mode 2, when the first temperature satisfies a third preset condition, it is determined that there is a first temperature sensor suspected of having a temperature detection abnormality, without starting the thermal management of the battery pack.

[0082] The third preset condition includes at least one of the following:

[0083] 1. The maximum value of the plurality of first temperatures is greater than the second temperature threshold, and the sixth difference between at least one first temperature and the average of the plurality of first temperatures is greater than a fifth temperature threshold; the fifth temperature threshold is greater than the third temperature threshold.

[0084] 2. The minimum value of the plurality of first temperatures is less than the fourth temperature threshold, and the seventh difference between the average of the plurality of first temperatures and at least one first temperature is greater than the fifth temperature threshold.

[0085] For example, when the battery management system collects the first temperatures (Tn) reported by each temperature sensor, if the maximum value (Tmax) is greater than 45℃, and there is at least one first temperature with a difference from the average of all first temperatures (Tavg) greater than 10℃ (Tn-Tavg>10℃).

[0086] For example, when the battery management system collects the first temperatures (Tn) reported by each temperature sensor, if the minimum value (Tmin) is less than -10℃, and there is at least one first temperature with a difference from the average of all first temperatures (Tavg) greater than 10℃ (Tavg-Tn>10℃).

[0087] It should be understood that each temperature threshold and each difference in each of the above modes and subsequent embodiments can be set according to actual needs, and the embodiments of the present application do not limit this. For example, the second temperature threshold is set to 50℃, and the first difference is set to 20℃.

[0088] In some embodiments, to further reduce the impact of random events on the determination of the first temperature sensor, the battery pack management system can determine that the corresponding first temperature sensor is suspected to detect abnormally if the collected first temperature satisfies the second preset condition or the third preset condition multiple times (e.g., 3 times) in one temperature sampling period (which can collect the first temperature multiple times).

[0089] The process of determining whether the first temperature sensor is abnormal again is described below.

[0090] When the battery pack management system screens the first temperature sensor suspected to be abnormal, the battery pack management system can determine whether the first temperature sensor really has a detection abnormality based on the second temperature reported by the first temperature sensor within a preset time period (e.g., 10 minutes).

[0091] For example, in a case where the second temperature satisfies the first preset condition, it is determined that the temperature detection of the first temperature sensor is abnormal, and in a case where the second temperature does not satisfy the first preset condition, it is determined that the temperature detection of the first temperature sensor is normal.

[0092] The first preset condition includes at least one of the following:

[0093] 1. The second temperature has a temperature jump, the jump amplitude is greater than a preset value, and the number of temperature jumps is greater than a preset number.

[0094] 2. The second temperature continuously rises or continuously falls, and the amplitude of the continuous rise or the continuous fall is greater than a preset amplitude.

[0095] 3. The first difference between the second temperature and the average of the plurality of second temperatures is less than or equal to a first temperature threshold.

[0096] The first preset condition is described below with a specific example.

[0097] For condition 1, the temperature jump refers to the abnormal fluctuation of the second temperature collected within a preset time, which is mostly irregular up and down fluctuation. In order to prevent false positives, the battery temperature is determined to be abnormal only when the second temperature has a temperature jump and the jump amplitude is greater than a preset value (e.g., 3℃) and the number of temperature jumps is greater than a preset number (e.g., 2 times). For example, for a certain first temperature sensor, the second temperature collected within 10 minutes is as follows:

[0098] 50℃, 50℃, 58℃, 50℃, 50℃, 60℃, 50℃, 30℃.

[0099] From the above second temperature, there are three temperature jumps, and the amplitude of each jump is greater than 3℃, so at this time it can be confirmed that the first temperature sensor temperature detection is abnormal.

[0100] For condition 2, the second temperature continues to rise or continue to fall means that the temperature detected by the first temperature sensor is always in a state of continuous increase and decrease, at this time the temperature sampling shows that the temperature difference from the average temperature gradually increases, and the outlier becomes more and more serious. For example, for a certain first temperature sensor, if the collected second temperature continues to rise or continue to fall within 10 minutes, and the amplitude of the rise or fall is greater than 5℃ from the first collected second temperature, it can be confirmed that the first temperature sensor temperature detection is abnormal.

[0101] For condition 3, this condition is used to characterize that the second temperature is always in a high or low state, that is, it deviates from the normal temperature by a certain value under all working conditions. For example, for a certain first temperature sensor, within 10 minutes, the first difference between each collected second temperature and the average of all collected second temperatures is calculated, and if the fluctuation between each first difference and the first difference obtained by the first collected second temperature is always less than or equal to the first temperature threshold (for example, 2℃), it can be confirmed that the first temperature sensor temperature detection is abnormal.

[0102] In summary, the battery pack temperature monitoring method provided by the embodiments of the present application determines whether the temperature detection of the first temperature sensor is abnormal again based on the second temperature collected by the first temperature sensor, under the condition that the first temperature sensor with suspected temperature detection abnormality is determined based on the first temperature collected by the temperature sensor. The second temperature sensor is a temperature sensor other than the first temperature sensor in the plurality of temperature sensors; if there is no abnormality, the first temperature sensor and the second temperature sensor are used to monitor the temperature of the battery pack. In the above manner, the temperature sensor is determined to be abnormal by setting multiple determination conditions and processes, which can effectively and accurately identify whether the temperature sensor is abnormal, thereby improving the accuracy of the temperature monitoring of the battery pack based on the temperature detected by the temperature sensor and reducing the false alarm probability.

[0103] In some embodiments, since each temperature sensor is responsible for temperature detection of a part of the battery pack, for the battery pack management system, the number of shielded temperature sensors cannot be too many, otherwise, the monitoring strength of the battery pack will be weakened, and some areas will be in the monitoring blind area, which will cause safety risks for a long time. Therefore, in order to ensure the safety of the whole vehicle, if the number of temperature sensors determined to be abnormal exceeds the preset number, it can be considered that the temperature monitoring system of the whole battery pack is abnormal.

[0104] For example, if the number of first temperature sensors with temperature detection abnormalities is greater than the preset number, first warning information is output. The first warning information is used to indicate that temperature monitoring of the battery pack is abnormal.

[0105] For example, if the number of temperature sensors re-confirmed according to the second temperature collected by the first temperature sensor is greater than 4, it can be considered that the temperature monitoring system of the battery pack is abnormal, and the battery pack management system can display the first warning information on the central control of the vehicle, or push the first warning information to the user's client to prompt that the temperature monitoring of the current battery pack is abnormal and may need to be repaired.

[0106] In some embodiments, for the battery management system, after each power-on, the first temperature sensor with abnormality confirmed last time should be re-detected to prevent the first temperature sensor from recovering to normal due to user maintenance or other reasons after power-off, so as to ensure the effectiveness of the battery pack temperature monitoring.

[0107] For example, after the battery pack management system is powered on again, a third temperature collected by the first temperature sensor with temperature detection abnormality determined before the last power-off is obtained. If the difference between the third temperature and the average temperature of the temperatures collected by the plurality of temperature sensors is less than a seventh temperature threshold, it is determined that the first temperature sensor with temperature detection abnormality has recovered to normal.

[0108] After the battery pack management system is powered on again, a third temperature collected by the first temperature sensor shielded last time is obtained. If the difference between the third temperature and the average temperature of the temperatures collected by all the first temperature sensors is less than a seventh temperature threshold (for example, 5°C), it can be confirmed that the temperature sensor has recovered to normal, and the shielding of the temperature sensor is cancelled.

[0109] In some embodiments, temperature monitoring of the battery pack includes power limiting of the output power of the battery pack, high and low temperature alarm, thermal runaway alarm, etc. For the temperature sensor determined to have abnormality, it will be shielded and not participate in temperature monitoring of the battery pack. However, since thermal runaway is the highest risk level warning, to improve driving safety and prevent temperature monitoring blind area, for the temperature sensor determined to have abnormality, the temperature collected by the temperature sensor is still involved in the determination of thermal runaway (i.e., not involved in other temperature monitoring), and the thermal runaway determination logic is increased to ensure the effectiveness of the thermal runaway alarm. It should be understood that for the normal temperature sensor, the determination method for thermal runaway is consistent with the prior art.

[0110] For example, the battery pack is managed according to the temperature detected by the first temperature sensor, the voltage of the battery cell of the battery pack, and the number of broken wires between the battery pack and the battery management system.

[0111] When the battery pack temperature management system determines that the temperature detected by the first temperature sensor is greater than the sixth temperature threshold (for example, greater than 85°C), it is considered that the battery pack has suspected thermal runaway. In order to prevent false positives of the first temperature sensor, the battery pack temperature management system obtains the voltage of each battery cell in the battery pack and / or the number of broken wires between the battery pack and the battery management system.

[0112] If any battery cell voltage is less than a preset voltage (for example, 1 volt), or the number of broken wires is greater than or equal to a preset number (2), it is determined that the battery pack has a risk of thermal runaway, and a thermal runaway risk warning information is output. If there is no battery cell voltage less than a preset voltage (for example, 1 volt), or the number of broken wires is less than a preset number (2), it is determined that the battery pack does not have a risk of thermal runaway, and the first temperature sensor is a false positive.

[0113] In the above manner, when the thermal runaway prediction is based on the abnormal temperature sensor, the determination condition is increased to prevent false positives and false negatives.

[0114] In summary, the temperature monitoring method of the battery pack provided by the embodiments of the present application can comprehensively monitor the abnormality of the temperature sensor by setting multiple and multiple determination conditions, respond to the abnormality in a timely manner, and has a low false positive probability. At the same time, the customer experience is prioritized in the temperature processing process, and when an abnormal temperature is found, a secondary confirmation is performed, and the power limiting, high and low temperature alarm, and thermal runaway alarm are not triggered within the confirmation time, reducing customer perception and ensuring customer driving experience. When the thermal runaway alarm is based on the abnormal temperature sensor, the determination condition is increased to prevent false positives and false negatives. At the same time, the present solution does not introduce any components, and only relies on system strategies to identify and process abnormal temperature sensors, which is simple in design and does not increase costs.

[0115] On the basis of the above-mentioned embodiments, the embodiments of the present application also provide a battery pack temperature monitoring device applied to a battery pack management system, wherein a plurality of temperature sensors are arranged in the battery pack, and different temperature sensors are used to collect the temperature of different regions of the battery pack.

[0116] Figure 3 The structure diagram of the battery pack temperature monitoring device 30 provided by the embodiments of the present application is shown in FIG. 1, which includes: Figure 3

[0117] ​The processing module 301 is configured to, in a case where it is determined that the first temperature sensor with suspected temperature detection abnormality exists based on the first temperature collected by the temperature sensor, monitor the temperature of the battery pack by using a second temperature sensor, and determine whether the temperature detection of the first temperature sensor is abnormal again based on a second temperature collected by the first temperature sensor. The second temperature sensor is a temperature sensor other than the first temperature sensor in the plurality of temperature sensors.

[0118] The monitoring module 302 is configured to, in a case where there is no abnormality, monitor the temperature of the battery pack by using the first temperature sensor and the second temperature sensor.

[0119] In some embodiments, the processing module 301 is further configured to, in a case where the second temperature satisfies a first preset condition, determine that the temperature detection of the first temperature sensor is abnormal, and in a case where the second temperature does not satisfy the first preset condition, determine that the temperature detection of the first temperature sensor is normal.

[0120] The first preset condition includes at least one of the following:

[0121] The second temperature has a temperature jump, and a jump amplitude is greater than a preset value and a jump number is greater than a preset number.

[0122] The second temperature continuously rises or continuously falls, and a continuously rising or continuously falling amplitude is greater than a preset amplitude.

[0123] The second temperature is less than or equal to a first temperature threshold value from a plurality of first temperature means.

[0124] In some embodiments, the processing module 301 is further configured to, in a case where the battery pack starts heat management, determine that the first temperature sensor with suspected temperature detection abnormality exists when the first temperature satisfies a second preset condition.

[0125] The second preset condition includes at least one of the following:

[0126] A maximum value in the plurality of first temperatures is greater than a second temperature threshold value, and a fourth difference between at least one first temperature and a mean value of the plurality of first temperatures is greater than a third temperature threshold value.

[0127] A minimum value of the plurality of first temperatures is less than a fourth temperature threshold value, and a fifth difference between a mean value of the plurality of first temperatures and at least one first temperature is greater than the third temperature threshold value.

[0128] In some embodiments, the processing module 301 is further configured to, in a case where the battery pack does not start heat management, determine that the first temperature sensor with suspected temperature detection abnormality exists when the first temperature satisfies a third preset condition.

[0129] The third preset condition comprises at least one of the following:

[0130] The maximum value of the plurality of first temperatures is greater than the second temperature threshold, and a sixth difference value between the at least one first temperature and the average value of the plurality of first temperatures is greater than a fifth temperature threshold; the fifth temperature threshold is greater than the third temperature threshold.

[0131] The minimum value of the plurality of first temperatures is less than the fourth temperature threshold, and a seventh difference value between the average value of the plurality of first temperatures and the at least one first temperature is greater than the fifth temperature threshold.

[0132] In some embodiments, the processing module 301 is further configured to output first alarm information if the number of temperature detection abnormal first temperature sensors is greater than a preset number; the first alarm information is used to indicate that temperature monitoring of the battery pack is abnormal.

[0133] In some embodiments, the processing module 301 is further configured to perform thermal runaway management on the battery pack according to the temperature collected by the temperature detection abnormal first temperature sensor, the cell voltage of the battery pack, and the number of disconnected wires between the battery pack and the battery management system.

[0134] In some embodiments, the processing module 301 is further configured to obtain the cell voltage or the number of disconnected wires if the temperature collected by the temperature detection abnormal first temperature sensor is greater than a sixth temperature threshold; if any cell voltage is less than a preset voltage, or the number of disconnected wires is greater than or equal to a preset number, it is determined that the battery pack has a thermal runaway risk, and thermal runaway risk alarm information is output.

[0135] In some embodiments, the processing module 301 is further configured to obtain a third temperature collected by the temperature detection abnormal first temperature sensor before the last power failure after the battery pack management system is powered on again; if the difference between the third temperature and the average value of the temperatures collected by the plurality of temperature sensors is less than a seventh temperature threshold, it is determined that the temperature detection abnormal first temperature sensor is normal.

[0136] The battery pack temperature monitoring device provided by the embodiments of the present application can execute the battery pack temperature monitoring method provided by any of the above embodiments, and has similar principles and technical effects, which will not be repeated here.

[0137] It should be understood that the division of each module of the above device is only a logical functional division, and all or part of the actual implementation can be integrated into a physical entity, or can be physically separated. And these modules can all be implemented in the form of software called by a processing element; all in the form of hardware; some modules can be implemented in the form of software called by a processing element, and some modules can be implemented in the form of hardware. Each module can be a separately established processing element, or can be integrated in a chip of the above device, in addition, the functions of each module can also be stored in the memory of the above device in the form of program code, and called and executed by a processing element of the above device. In addition, all or part of these modules can be integrated together, or can be independently implemented. The processing element here can be an integrated circuit with signal processing capability. In the implementation process, each step of the above method or each module can be completed by the integrated logic circuit of hardware in the processor element or the instruction in the form of software.

[0138] The embodiment of the present application also provides a battery pack management system.

[0139] Figure 4 The structure schematic diagram of the battery pack management system 40 provided by the embodiment of the present application is shown in the figure, which comprises a transceiver 401, a processor 402 and a memory 403. Figure 4

[0140] The processor 402 executes the computer execution instruction stored in the memory, so that the processor 402 executes the scheme in the above embodiment. The processor 402 can be a general-purpose processor, including a central processing unit CPU, a network processor NP, etc.; can also be a digital signal processor DSP, an application-specific integrated circuit ASIC, a field programmable gate array FPGA or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0141] The memory 403 is connected with the processor 402 through a system bus and completes mutual communication, and the memory 403 is used for storing computer program instructions.

[0142] The transceiver 401 can execute receiving the first temperature or the second temperature and sending the control instruction.

[0143] Optionally, the electronic device 40 can also include a communication interface, so that the communication interface can communicate and interact with external or internal devices. The external device can be a client (for example, a mobile phone, a tablet) for example. In specific implementation, if the communication interface, the memory 403 and the processor 402 are independently implemented, the communication interface, the memory 403 and the processor 402 can be connected with each other through a bus and complete mutual communication. ​

[0144] The system bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, among others. The system bus can be divided into an address bus, a data bus, a control bus, and so on. For ease of illustration, the figure shows only one thick line, but this does not imply that there is only one bus or only one type of bus. Transceivers are used to enable communication between the database access device and other computers (e.g., clients, read-write libraries, and read-only libraries). Memory may include random access memory (RAM) and non-volatile memory.

[0145] Optionally, in a specific implementation, if the communication interface, memory 403 and processor 402 are integrated on a chip, the communication interface, memory 403 and processor 402 can complete communication through an internal interface.

[0146] An embodiment of the present application also provides a vehicle.

[0147] Figure 5 A schematic diagram of the structure of a vehicle is provided for the embodiment of the present application, such as Figure 5 As shown, the vehicle is provided with the battery pack management system described in any of the aforementioned embodiments.

[0148] In an embodiment of the present application, a computer-readable storage medium is also provided, on which a computer program is stored. When the computer program is executed by a processor, the technical solution of the above-mentioned battery pack temperature monitoring method embodiment is implemented. Its implementation principle and technical effect are similar and will not be repeated here.

[0149] In a possible implementation, the computer readable medium can include a random access memory (RAM), a read-only memory (ROM), a compact disc read-only memory (CD-ROM) or other optical memory, a magnetic disk storage or other magnetic storage device, or any other medium that is suitable for storing desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection is properly termed a computer readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray® disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer readable media.

[0150] The embodiments of the present application also provide a computer program product, including a computer program, which, when executed by a processor, implements the technical solutions of the above battery pack temperature monitoring method embodiments, and has similar implementation principles and technical effects, which will not be described here.

[0151] In the specific implementation of the terminal device or the server, it should be understood that the processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as hardware processor execution, or executed by hardware and software modules in the processor.

[0152] Those skilled in the art can understand that all or part of the steps of any of the above method embodiments can be completed by hardware related to program instructions. The foregoing program can be stored in a computer readable storage medium, and when the program is executed, all or part of the steps of the above method embodiments are executed.

[0153] If the technical solutions of the present application are realized in the form of software and sold or used as products, they can be stored in a computer readable storage medium. Based on this understanding, all or part of the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium and includes a computer program or a plurality of instructions. The computer software product enables a computer device (which can be a personal computer, a server, a network device or similar electronic equipment) to execute all or part of the steps of the method described in the embodiments of the present application.

[0154] It should be noted that, for the foregoing method embodiments, in order to simply describe, they are all expressed as a combination of a series of actions, but those skilled in the art should know that the present application is not limited to the order of the actions described, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present application.

[0155] It should be further noted that, although each step in the flowchart is displayed in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless otherwise stated in this document, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, at least part of the steps in the flowchart can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily sequential, but can be executed in rotation or alternation with other steps or sub-steps or stages of other steps.

[0156] It should be understood that the above-mentioned device embodiments are only schematic, and the device of the present application can also be realized by other ways. For example, the division of units / modules in the above-mentioned embodiments is only a logical function division, and another division way can be used in actual implementation. For example, multiple units, modules or components can be combined, or can be integrated into another system, or some features can be ignored or not executed.

[0157] In addition, each functional unit / module in each embodiment of the present application can be integrated in one unit / module, or each unit / module can exist physically, or two or more units / modules can be integrated together. The integrated unit / module can be realized in the form of hardware or in the form of a software program module.

[0158] If the integrated units / modules are implemented in the form of hardware, the hardware can be a digital circuit, an analog circuit, etc. The physical implementation of the hardware structure includes, but is not limited to, transistors, memristors, etc. Unless otherwise specified, the processor can be any appropriate hardware processor, such as a CPU, a GPU, an FPGA, a DSP, an ASIC, etc. Unless otherwise specified, the storage unit can be any appropriate magnetic storage medium or magneto-optical storage medium, such as resistive random access memory (RRAM), dynamic random access memory (DRAM), static random access memory (SRAM), enhanced dynamic random access memory (EDRAM), high-bandwidth memory (HBM), hybrid memory cube (HMC), etc.

[0159] If the integrated units / modules are implemented in the form of software program modules and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the essential part or all or part of the technical solutions that make contributions to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the embodiments of the present application. The aforementioned storage medium includes a U disk, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0160] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments. The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0161] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack temperature monitoring method, characterized in that: Applied to a battery pack management system, the battery pack is provided with multiple temperature sensors, and different temperature sensors are used to collect temperatures of different areas of the battery pack; the method includes: If a first temperature sensor suspected of having abnormal temperature detection is determined based on the first temperature collected by the temperature sensor, a second temperature sensor is used to monitor the temperature of the battery pack, and based on the second temperature collected by the first temperature sensor, it is again determined whether the temperature detection of the first temperature sensor is abnormal; the second temperature sensor is a temperature sensor other than the first temperature sensor among the multiple temperature sensors; If there is no abnormality, using the first temperature sensor and the second temperature sensor to monitor the temperature of the battery pack; The determining, based on the first temperature collected by the temperature sensor, of a first temperature sensor suspected of having temperature detection abnormality includes: In a case where thermal management of the battery pack is enabled, when the first temperature satisfies a second preset condition, determining that there is a first temperature sensor suspected of having temperature detection abnormality; The second preset condition includes at least one of the following: a maximum value among the plurality of first temperatures is greater than a second temperature threshold, and a fourth difference between at least one first temperature and an average of the plurality of first temperatures is greater than a third temperature threshold; a minimum value of the plurality of first temperatures is less than a fourth temperature threshold, and a fifth difference between an average value of the plurality of first temperatures and at least one first temperature is greater than the third temperature threshold; The determining again whether the temperature detected by the first temperature sensor is abnormal based on the second temperature collected by the first temperature sensor includes: If the second temperature satisfies a first preset condition, determining that the temperature detection of the first temperature sensor is abnormal; if the second temperature does not satisfy the first preset condition, determining that the temperature detection of the first temperature sensor is normal; The first preset condition includes at least one of the following: The second temperature experiences a temperature jump, and the jump amplitude is greater than a preset value, and the number of jumps is greater than a preset number; The second temperature continues to rise or continues to fall, and the amplitude of the continuous rise or continuous fall is greater than a preset amplitude; The second temperature and an average of the first temperatures are less than or equal to a first temperature threshold.

2. The method according to claim 1, characterized in that The determining, based on the first temperature collected by the temperature sensor, of a first temperature sensor suspected of having temperature detection abnormality includes: In a case where thermal management of the battery pack is not enabled, when the first temperature satisfies a third preset condition, determining that there is a first temperature sensor suspected of having a temperature detection abnormality; The third preset condition includes at least one of the following: A maximum value among the plurality of first temperatures is greater than the second temperature threshold, and a sixth difference between at least one first temperature and an average of the plurality of first temperatures is greater than a fifth temperature threshold; the fifth temperature threshold is greater than the third temperature threshold; A minimum value of the plurality of first temperatures is less than the fourth temperature threshold, and a seventh difference between an average value of the plurality of first temperatures and at least one first temperature is greater than the fifth temperature threshold.

3. The method according to claim 1 or 2, characterized in that The method further comprises: If the number of the first temperature sensors with abnormal temperature detection is greater than a preset number, a first alarm message is output; the first alarm message is used to indicate that an abnormality has occurred in the temperature monitoring of the battery pack.

4. The method according to claim 3, characterized in that The method further comprises: Thermal runaway management is performed on the battery pack based on the temperature collected by the first temperature sensor that detects the abnormal temperature, the cell voltage of the battery pack, and the number of broken wires between the battery pack and the battery management system.

5. The method according to claim 4, characterized in that The thermal runaway management of the battery pack is performed based on the temperature collected by the first temperature sensor detecting the abnormal temperature, the cell voltage of the battery pack, and the number of broken wires between the battery pack and the battery management system, including: If the temperature collected by the first temperature sensor with abnormal temperature detection is greater than a sixth temperature threshold, obtaining the battery cell voltage or the number of disconnections; If the voltage of any battery cell is lower than a preset voltage, or the number of disconnections is greater than or equal to a preset number, it is determined that the battery pack has a thermal runaway risk, and thermal runaway risk warning information is output.

6. The method according to claim 1 or 2, characterized in that The method further comprises: After the battery pack management system is powered on again, obtaining a third temperature collected by the first temperature sensor that was abnormal in temperature detection and was determined before the last power failure; If the difference between the third temperature and the average temperature value collected by the plurality of temperature sensors is smaller than a seventh temperature threshold, it is determined that the first temperature sensor with abnormal temperature detection has returned to normal.

7. A battery pack temperature monitoring device, characterized in that: Applicable to a battery pack management system, wherein the battery pack is provided with multiple temperature sensors, and different temperature sensors are used to collect the temperature of different areas of the battery pack; the device includes: a processing module, configured to, if a first temperature sensor suspected of having abnormal temperature detection is determined based on the first temperature collected by the temperature sensor, monitor the temperature of the battery pack using a second temperature sensor, and again determine whether the temperature detection of the first temperature sensor is abnormal based on the second temperature collected by the first temperature sensor; the second temperature sensor being a temperature sensor other than the first temperature sensor among the multiple temperature sensors; a monitoring module, configured to monitor the temperature of the battery pack using the first temperature sensor and the second temperature sensor if no abnormality occurs; The processing module is specifically used to: In a case where thermal management of the battery pack is enabled, when the first temperature satisfies a second preset condition, determining that there is a first temperature sensor suspected of having temperature detection abnormality; The second preset condition includes at least one of the following: a maximum value among the plurality of first temperatures is greater than a second temperature threshold, and a fourth difference between at least one first temperature and an average of the plurality of first temperatures is greater than a third temperature threshold; a minimum value of the plurality of first temperatures is less than a fourth temperature threshold, and a fifth difference between an average value of the plurality of first temperatures and at least one first temperature is greater than the third temperature threshold; If the second temperature satisfies a first preset condition, determining that the temperature detection of the first temperature sensor is abnormal; if the second temperature does not satisfy the first preset condition, determining that the temperature detection of the first temperature sensor is normal; The first preset condition includes at least one of the following: The second temperature experiences a temperature jump, and the jump amplitude is greater than a preset value, and the number of jumps is greater than a preset number; The second temperature continues to rise or continues to fall, and the amplitude of the continuous rise or continuous fall is greater than a preset amplitude; The second temperature and an average of the first temperatures are less than or equal to a first temperature threshold.

8. A battery pack management system, characterized in that: include: Memory for storing computer programs; A processor, configured to execute the computer program to implement the method according to any one of claims 1 to 6.

9. A vehicle, characterized in that: The vehicle is provided with the battery pack management system as claimed in claim 8.

10. A computer-readable storage medium, characterized in that A computer program is stored thereon, and the computer program is executed by a processor to implement the method according to any one of claims 1 to 6.

11. A computer program product, characterized in that The computer program comprises a computer program, which implements the method according to any one of claims 1 to 6 when executed by a controller.

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