An adaptive battery insulation system in low temperature environment

Abstract

The present invention relates to the field of battery technology, and in particular to an adaptive battery insulation system in a low temperature environment. The system includes a battery pack module, a data acquisition module, a battery heating module, a data processing module, a heat preservation control module, and a temperature control execution module. The present invention monitors and analyzes the vibration interference of the battery pack module, not only to obtain temperature data in the absence of vibration interference, but also to periodically monitor the battery pack module, and in the case of vibration interference, by combining and analyzing the temperature data and vibration data of the battery pack module, to avoid the failure to detect the cracking of the battery pack shell in time when the power battery system is seriously affected by the vibration generated by the terrain, thereby affecting the working performance of the battery. Therefore, by setting a data acquisition module to monitor the vibration condition and temperature condition of the power vehicle in real time, the heat preservation control module can respond to the low temperature protection control of the battery in time, thereby improving the safety management efficiency of the battery system.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to an adaptive battery heat preservation system in a low temperature environment. Background Art

[0002] A hydropower project is located in the Qinghai-Tibet Plateau. It uses new energy electric dump trucks, electric loaders and other electric equipment for construction. The project is located in a mountainous canyon area. The plateau climate has obvious three-dimensional characteristics. The temperature changes vertically with the terrain height, there are many climate types, the daily temperature difference is large, the annual temperature difference is small, and the dry and wet seasons are distinct. The temperature is also closely related to the sunshine time, and the temperature rises and falls quickly. For example, the temperature drops sharply on rainy days in summer; in winter, due to the geographical climate of the plateau area itself, the temperature is generally low. In addition, it is inevitable to sprinkle water to reduce dust during the construction of the open line section. Special attention should be paid to the icing of the road surface. This situation leads to poor flatness of the terrain conditions and increases the complexity of the construction of electric equipment. In the low temperature environment of the plateau mountain, if the battery insulation system of electric equipment such as electric dump trucks and electric loaders cannot respond to the changes in ambient temperature in time, the advantage of the electric equipment's fast start will be converted. Therefore, how to adapt to the environment to achieve low temperature protection of the battery system has become a topic of concern to relevant researchers.

[0003] The patent document with the Chinese authorization announcement number CN109301396B discloses a battery insulation system and control method for electric vehicles in low temperature environments, including a heat exchange box, a controller, a start switch, a protection switch, a temperature limit / insulation switch, an insulation indicator light, a heating indicator light, an electric heater, a circulating power source and a temperature detection device. In a low temperature environment, the heat transfer medium flowing through the electric heater is heated by turning on the electric heater, and then the circulating power source drives the heat transfer medium to circulate back and forth between the electric heater and the heat exchange box through the heat transfer pipe. After entering the heat exchange box, the heat transfer medium exchanges heat with the battery pack. Since the temperature of the heat transfer medium is relatively high, the temperature will be transferred from the heat transfer medium to the battery pack in the heat exchange box at this time, and then the heat transfer medium that has completed the heat exchange re-enters the electric heater for heating, thereby continuously heating the battery pack; it can be seen that the battery insulation system of the existing power equipment lacks the combination of vibration data and temperature data for analysis, and timely response to charging insulation control according to the analysis results, resulting in low safety management efficiency of the battery system. Summary of the invention

[0004] To this end, the present invention provides an adaptive battery insulation system in a low temperature environment to overcome the problem in the prior art of lacking correlation analysis between vibration data and temperature data, resulting in low efficiency in safety management of power equipment when affected by terrain.

[0005] To achieve the above object, the present invention provides an adaptive battery insulation system in a low temperature environment, comprising:

[0006] A data acquisition module, comprising a plurality of temperature sensors arranged at various detection points, and a vibration sensor arranged inside the housing of the battery pack module, wherein the data acquisition module is used to obtain temperature change data of the single battery through the temperature sensors, and to obtain vibration data of the battery pack module through the vibration sensors;

[0007] A battery heating module, which is arranged inside the battery pack to be tested and can be activated by a power supply to raise the actual battery temperature to within a standard operating temperature range;

[0008] A data processing module, connected to the data acquisition module, for processing the vibration data to obtain a real-time monitoring data set and a periodic monitoring data set;

[0009] a heat preservation control module connected to the data processing module, and used to analyze the vibration state of the battery pack module according to the real-time monitoring data set, and to analyze the temperature state of the battery pack module according to the periodic monitoring data set, so as to generate a corresponding low temperature protection control instruction or a warning prompt instruction;

[0010] A temperature control execution module, which is connected to the heat preservation control module and the battery heating module, and is used to receive the low temperature protection control instruction or the early warning prompt instruction, execute the low temperature protection control strategy and output the early warning prompt instruction;

[0011] The low temperature protection control strategy includes a charging and heat preservation control mode, a charging and heat preservation waiting control mode and a sleep control mode.

[0012] Furthermore, the heat preservation control module includes a real-time monitoring unit, a correlation monitoring unit, a heat preservation control unit and a regular monitoring unit, wherein:

[0013] The real-time monitoring unit is used to preliminarily determine the degree of influence of vibration on the battery pack module according to the real-time monitoring data set;

[0014] The correlation monitoring unit is used to analyze the influence degree of vibration on the thermal insulation performance of the battery pack module according to the influence degree correlation temperature data to obtain a correlation analysis result;

[0015] The periodic monitoring unit is used to periodically monitor the influence of temperature on the battery pack module according to the periodic monitoring data set to obtain a periodic monitoring result;

[0016] The insulation control unit generates a corresponding low temperature protection control instruction or early warning prompt instruction according to the correlation analysis result and the regular monitoring result, responds to the low temperature protection control strategy according to the low temperature protection control instruction, and outputs an early warning prompt indication according to the early warning prompt instruction.

[0017] Furthermore, the data processing module includes a data judgment unit and a data storage unit, wherein:

[0018] The data judgment unit is used to judge the real-time vibration displacement according to the set standard displacement fluctuation range to determine whether the real-time vibration displacement falls within the standard displacement fluctuation range;

[0019] The data storage unit is used to store the vibration data corresponding to the real-time vibration displacement falling within the standard displacement fluctuation range into the periodic monitoring data set, and to store the vibration data corresponding to the real-time vibration displacement not falling within the standard displacement fluctuation range into the real-time monitoring data set.

[0020] Furthermore, the real-time monitoring unit includes an acquisition subunit and a determination subunit, wherein:

[0021] The acquisition subunit is used to calculate the real-time difference vibration ratio based on the number of difference vibration displacements in the real-time monitoring data set;

[0022] The determination subunit is used to determine the real-time difference vibration ratio according to the standard difference vibration ratio, and determine the influence degree of the vibration on the battery pack module according to the determination result;

[0023] When it is determined that the real-time difference vibration ratio is greater than or equal to the standard difference vibration ratio, the associated monitoring unit associates the temperature change data for analysis;

[0024] The real-time differential vibration ratio is the percentage of the number of differential vibration displacements in the real-time monitoring data set to the total number of collection points within a preset time interval.

[0025] Furthermore, the temperature change data includes the real-time battery temperature corresponding to each of the single batteries, and the associated monitoring unit includes a temperature analysis subunit and an alarm prompt subunit, wherein:

[0026] The temperature analysis subunit analyzes the real-time battery temperature of each of the single cells according to the lowest standard temperature and the second standard temperature to obtain the influence of the vibration on the thermal insulation performance of the battery pack module;

[0027] The alarm prompt subunit is used to generate an alarm prompt instruction and send it to an external management terminal when the real-time battery temperature is lower than the minimum standard temperature.

[0028] Furthermore, the association monitoring unit further includes an amplitude analysis subunit,

[0029] The amplitude analysis subunit is used to obtain the real-time horizontal vibration amplitude and the real-time vertical vibration amplitude for analysis when the real-time battery temperature is between the lowest standard temperature and the second standard temperature, so as to obtain the correlation analysis result.

[0030] Furthermore, the heat preservation control unit includes a low temperature protection control instruction generation subunit and a warning prompt instruction generation subunit, wherein:

[0031] The low temperature protection control instruction generating subunit is used to generate a first low temperature protection control instruction when the real-time horizontal vibration amplitude and the real-time vertical vibration amplitude are both lower than a threshold value, and to generate a second low temperature protection control instruction when the real-time horizontal vibration amplitude or the real-time vertical vibration amplitude is higher than the threshold value;

[0032] The early warning prompt instruction generating subunit is used to generate an early warning prompt instruction when the real-time horizontal vibration amplitude and the real-time vertical vibration amplitude are both higher than a threshold value.

[0033] Further, the low temperature protection control strategy corresponding to the third low temperature protection control instruction is to start the charging and heat preservation waiting control mode. When the time reaches the preset start time, if it is still determined that the real-time difference vibration ratio is greater than or equal to the standard difference vibration ratio, the charging and heat preservation control mode is started;

[0034] The low temperature protection control strategy corresponding to the second low temperature protection control instruction is to start the charging heat preservation control mode;

[0035] The low temperature protection control strategy corresponding to the first low temperature protection control instruction is to start the sleep control mode;

[0036] The early warning prompt instruction is to issue an early warning prompt instruction to reduce the vehicle speed.

[0037] Further, the low temperature protection control instruction generation subunit generates a corresponding low temperature protection control instruction based on the periodic monitoring result;

[0038] Wherein, when the real-time battery temperature is lower than the first standard temperature, a second low temperature protection control instruction is generated;

[0039] When the real-time battery temperature is between the first standard temperature and the second standard temperature, generating a third low temperature protection control instruction;

[0040] When the real-time battery temperature is greater than the second standard temperature, a first low temperature protection control instruction is generated.

[0041] Furthermore, the battery pack module includes a plurality of single cells, and a corresponding detection point is arranged inside the shell of each single cell;

[0042] The temperature sensor is used to collect the real-time battery temperature at each of the detection points.

[0043] Compared with the prior art, the beneficial effect of the present invention lies in that, by monitoring and analyzing the vibration interference of the battery pack module, not only the temperature data is obtained in the absence of vibration interference to perform periodic monitoring of the battery pack module, but also the temperature data and vibration data of the battery pack module are combined and analyzed under the condition of vibration interference. Since the power battery system may be seriously affected by the vibration generated by the terrain, causing the battery pack shell to crack, thereby affecting the working performance of the battery and even causing a thermal runaway event, therefore, by setting a data acquisition module to monitor the vibration condition and temperature condition of the power vehicle in real time, the thermal insulation control module can respond to the low temperature protection control of the battery in time, thereby improving the safety management efficiency of the battery system.

[0044] Furthermore, when it is determined that the real-time vibration displacement does not fall into the standard displacement fluctuation range, a detection value exceeding the standard displacement is obtained to characterize the frequency of exceeding the vibration limit. The frequency of exceeding the vibration limit is characterized by calculating the proportion of the number of detection values ​​of this category within a preset time interval as the real-time difference vibration proportion. If the real-time difference vibration proportion is less than the standard difference vibration proportion, it means that the frequency of the difference vibration is very small and can be ignored. In this case, it means that the vibration is not abnormal. If it is determined that the real-time difference vibration proportion is greater than or equal to the standard difference vibration proportion, it means that the frequency of the difference vibration is large. In this case, due to the large vibration to which the power equipment is subjected during driving on uneven terrain, sudden failures such as cracking of the single cell shell may be caused, resulting in the thermal insulation performance of the battery pack module being affected, thereby affecting the working performance of the battery and even causing a thermal runaway event. Therefore, the actual temperature of the battery pack module is obtained for correlation analysis to monitor the status of the battery pack module and respond to the corresponding low temperature protection control measures in a timely manner to improve the safety management efficiency of the battery pack module. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a schematic diagram of the structure of an adaptive battery heat preservation system in a low temperature environment according to an embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the structure of a thermal insulation control module according to an embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of the structure of a data processing module according to an embodiment of the present invention;

[0048] Figure 4 It is a structural schematic diagram of an associated monitoring unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0051] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0052] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] See also Figure 1 As shown, it is a schematic diagram of the structure of an adaptive battery heat preservation system in a low temperature environment according to an embodiment of the present invention. The present invention provides an adaptive battery heat preservation system in a low temperature environment, comprising:

[0054] A battery pack module, comprising a plurality of single cells, each of which is connected in series, in parallel or in combination to form the battery pack module, and a corresponding detection point is arranged inside the housing of each of the single cells;

[0055] A data acquisition module, comprising a plurality of temperature sensors arranged at various detection points for collecting real-time battery temperature, and a vibration sensor arranged inside the housing of the battery pack module, wherein the data acquisition module is used to obtain temperature change data of the single battery through the temperature sensor, and to obtain vibration data of the battery pack module through the vibration sensor;

[0056] A battery heating module, which is arranged inside the battery pack to be tested and can be activated by a power supply to raise the actual battery temperature to within a standard operating temperature range;

[0057] A data processing module, connected to the data acquisition module, for processing the temperature change data and the vibration data to obtain a real-time monitoring data set;

[0058] A heat preservation control module, which is connected to the data processing module and is used to analyze the current battery status according to the real-time monitoring data set to generate a corresponding charging heat preservation control instruction;

[0059] The temperature control execution module is connected to the heat preservation control module, and is used to receive the charging heat preservation control instruction, execute the charging heat preservation control strategy and output early warning prompt instructions.

[0060] The battery pack module in this embodiment is a power vehicle battery, and the battery is sensitive to the ambient temperature, especially in the plateau and mountainous environment, where the climate is cold. The average monthly temperature in summer in some areas is 10-15°C, and the winter lasts for 7-9 months, with the lowest temperature below -20°C. In addition, due to the terrain characteristics of the plateau and mountainous areas, if the vehicle is traveling on a road section with poor flatness, vibrations of different amplitudes will be generated, among which more serious impact vibrations may cause power battery system failures, which are manifested as structural damage or loose wiring, etc. The battery heating module is an integrated heating wire or heating film in the battery pack to be tested, which can be activated by power supply to quickly increase the battery temperature to the optimal working range. The insulation control module analyzes the monitored temperature data and vibration data. When the actual temperature of the single battery is lower than the first standard battery temperature, the heating film will be turned on. The power source heats the single cell and increases the temperature of the single cell. When the electric vehicle is driving on uneven ground, that is, when the vibration of the battery pack module is detected to be large, the structure of the battery pack module may be damaged by the vibration, and the low temperature may increase the brittleness of the battery material. Therefore, a higher temperature threshold is set to start the charging and heat preservation mode, that is, by setting a minimum standard temperature higher than the first standard temperature, when the actual temperature is lower than the minimum standard temperature, the heating film power is turned on to heat the single cell to avoid battery damage caused by the combined effect of low temperature and vibration. At the same time, the insulation control module will send a request to the on-board charger to obtain the charging current and charging voltage to ensure that the charging current and charging voltage are within an appropriate range. The power supply is obtained by converting household 220V electricity to ensure the stability and reliability of the charging and heat preservation function.

[0061] By monitoring and analyzing the vibration interference of the battery pack module, not only can temperature data be obtained in the absence of vibration interference to perform periodic monitoring of the battery pack module, but also the temperature data and vibration data of the battery pack module can be combined and analyzed under vibration interference. Since the power battery system may be seriously affected by the vibration generated by the terrain, causing the battery pack shell to crack, thereby affecting the battery's working performance and even causing thermal runaway events, therefore, by setting up a data acquisition module to monitor the vibration conditions and temperature conditions of the power vehicle in real time, the thermal insulation control module can respond to the low temperature protection control of the battery in time, thereby improving the safety management efficiency of the battery system.

[0062] See also Figure 2 As shown, it is a structural schematic diagram of a heat preservation control module according to an embodiment of the present invention;

[0063] Specifically, the insulation control module includes a real-time monitoring unit, a correlation monitoring unit, an insulation control unit and a regular monitoring unit, wherein:

[0064] The real-time monitoring unit is used to preliminarily determine the degree of influence of vibration on the battery pack module according to the real-time monitoring data set;

[0065] The correlation monitoring unit is used to analyze the influence degree of vibration on the thermal insulation performance of the battery pack module according to the influence degree correlation temperature data to obtain a correlation analysis result;

[0066] The periodic monitoring unit is used to periodically monitor the influence of temperature on the battery pack module according to the periodic monitoring data set to obtain a periodic monitoring result;

[0067] The insulation control unit generates a corresponding low temperature protection control instruction or early warning prompt instruction according to the correlation analysis result and the regular monitoring result, responds to the low temperature protection control strategy according to the low temperature protection control instruction, and outputs an early warning prompt indication according to the early warning prompt instruction.

[0068] See also Figure 3 As shown, it is a structural diagram of a data processing module according to an embodiment of the present invention;

[0069] Specifically, the data processing module includes a data judgment unit and a data storage unit, wherein:

[0070] The data judgment unit is used to judge the real-time vibration displacement according to the set standard displacement fluctuation range to determine whether the real-time vibration displacement falls within the standard displacement fluctuation range;

[0071] The data storage unit is used to store the vibration data corresponding to the real-time vibration displacement falling within the standard displacement fluctuation range into the periodic monitoring data set, and to store the vibration data corresponding to the real-time vibration displacement not falling within the standard displacement fluctuation range into the real-time monitoring data set;

[0072] Specifically, the data judgment unit judges the real-time vibration displacement according to the standard displacement fluctuation range.

[0073] If the real-time vibration displacement falls within the standard displacement fluctuation range, the data storage unit stores the vibration data into the periodic monitoring data set;

[0074] If the real-time vibration displacement does not fall within the standard displacement fluctuation range, the data storage unit stores the vibration data into the real-time monitoring data set;

[0075] The standard displacement fluctuation range set in this embodiment represents the allowable vibration displacement. Under this vibration condition, the impact on the battery pack module can be ignored. The set value is related to the measurement accuracy of the vibration sensor, the safety requirements of the battery pack module under test, the operating environment and the type of battery under test. Generally, it is set within the range of 0.01mm-0.1m and is selected according to actual safety requirements.

[0076] Specifically, the real-time monitoring unit includes an acquisition subunit and a determination subunit, wherein:

[0077] The acquisition subunit is used to calculate the real-time difference vibration ratio based on the number of difference vibration displacements in the real-time monitoring data set;

[0078] The determination subunit is used to determine the real-time difference vibration ratio according to the standard difference vibration ratio, and determine the influence degree of the vibration on the battery pack module according to the determination result;

[0079] When it is determined that the real-time difference vibration ratio is greater than or equal to the standard difference vibration ratio, the associated monitoring unit associates the temperature change data for analysis;

[0080] The real-time differential vibration ratio is the percentage of the number of differential vibration displacements in the real-time monitoring data set to the total number of collection points within a preset time interval;

[0081] The real-time monitoring data set includes differential vibration displacement, real-time horizontal vibration amplitude, and real-time vertical vibration amplitude;

[0082] If the real-time difference vibration ratio is less than the standard difference vibration ratio, it is determined that the vibration has little impact on the battery pack module;

[0083] If the real-time difference vibration ratio is greater than or equal to the standard difference vibration ratio, it is determined that the vibration has a greater impact on the battery pack module, and the associated monitoring unit associates the temperature change data for analysis;

[0084] In this embodiment, the preset time interval is set between 1 second and 5 seconds, the standard difference vibration ratio represents the allowable vibration frequency, and the set value is a smaller number, generally set between 0.1-0.3, and is adaptively adjusted according to the set preset time interval, and is positively correlated with the preset time interval.

[0085] By obtaining the detection value exceeding the standard displacement when determining that the real-time vibration displacement does not fall into the standard displacement fluctuation range, the frequency of exceeding the vibration limit is characterized. By calculating the proportion of the number of detection values ​​of this category within the preset time interval, the frequency of exceeding the vibration limit is characterized as the real-time difference vibration proportion. If the real-time difference vibration proportion is less than the standard difference vibration proportion, it means that the frequency of the difference vibration is very small and can be ignored. In this case, it means that the vibration is not abnormal. If it is determined that the real-time difference vibration proportion is greater than or equal to the standard difference vibration proportion, it means that the frequency of the difference vibration is large. In this case, due to the large vibration of the power equipment during driving on uneven terrain, it may cause sudden failures such as cracking of the single battery shell, resulting in the thermal insulation performance of the battery pack module being affected, thereby affecting the working performance of the battery and even causing a thermal runaway event. Therefore, the actual temperature of the battery pack module is obtained for correlation analysis to monitor the status of the battery pack module and respond to the corresponding low temperature protection control measures in time to improve the safety management efficiency of the battery pack module.

[0086] See also Figure 4 As shown, it is a schematic diagram of the structure of the associated monitoring unit according to an embodiment of the present invention;

[0087] Specifically, the temperature change data includes the real-time battery temperature corresponding to each of the single cells, and the associated monitoring unit includes a temperature analysis subunit and an alarm prompt subunit, wherein:

[0088] The temperature analysis subunit analyzes the real-time battery temperature of each of the single cells according to the lowest standard temperature and the second standard temperature to obtain the influence of the vibration on the thermal insulation performance of the battery pack module;

[0089] The alarm prompt subunit is used to generate an alarm prompt instruction and send it to an external management terminal when the real-time battery temperature is lower than the minimum standard temperature;

[0090] In this embodiment, the lowest standard temperature set is 15°C, the first standard temperature is 10°C, and the second standard temperature is 20°C.

[0091] In the absence of vibration interference caused by terrain or other factors, the temperature threshold needs to be set between 10℃-20℃. Within this range, the normal charging and use of the battery pack module is ensured. On uneven terrain, when the vibration is large and the ambient temperature is low, the structural safety of the battery pack is threatened. In addition, low temperature may increase the brittleness of battery materials. At this time, a higher temperature threshold needs to be set to start the charging and heat preservation mode. Therefore, the minimum standard temperature is set to 15℃ to ensure that the battery can be effectively protected when the charging and heat preservation mode is started, avoiding battery damage caused by the combined effects of low temperature and vibration, improving the safety and reliability of the battery pack module, and ensuring the normal operation of power equipment (such as electric vehicles) in harsh environments.

[0092] Specifically, the association monitoring unit further includes an amplitude analysis subunit,

[0093] The amplitude analysis subunit is used to obtain the real-time horizontal vibration amplitude and the real-time vertical vibration amplitude for analysis to obtain an analysis result when the real-time battery temperature is between the lowest standard temperature and the second standard temperature.

[0094] In the case of vibration interference, the temperature threshold range is composed of the lowest standard temperature and the second standard temperature. Within this temperature range, the vibration amplitude is statistically tracked to more accurately analyze the impact of vibration interference on the battery pack module, so as to select the corresponding insulation control mode and improve the management efficiency of the battery insulation system.

[0095] Specifically, the temperature analysis subunit is used to obtain the real-time battery temperature of any of the single cells, and to determine the real-time battery temperature according to the lowest standard temperature and the second standard temperature.

[0096] If the real-time battery temperature is lower than the minimum standard temperature, the temperature analysis subunit performs a simulation mark on the single battery, and the alarm prompt subunit generates an alarm prompt instruction and sends it to an external management terminal;

[0097] If the real-time battery temperature is between the lowest standard temperature and the second standard temperature, the amplitude analysis subunit obtains the real-time horizontal vibration amplitude and the real-time vertical vibration amplitude for analysis;

[0098] If the real-time battery temperature is greater than the second standard temperature, the temperature analysis subunit continues to obtain the real-time battery temperature of the next single battery for determination, until it is determined that the real-time battery temperatures of all single batteries are less than the lowest standard temperature, and it is determined that the vibration has no effect on the thermal insulation performance of the battery pack module;

[0099] Specifically, the amplitude analysis subunit compares the real-time horizontal vibration amplitude and the real-time vertical vibration amplitude with the corresponding thresholds.

[0100] If the real-time horizontal vibration amplitude and the real-time vertical vibration amplitude are both lower than the threshold, a first low temperature protection control instruction is generated;

[0101] If the real-time horizontal vibration amplitude or the real-time vertical vibration amplitude is higher than the threshold, a second low temperature protection control instruction is generated;

[0102] If the real-time horizontal vibration amplitude and the real-time vertical vibration amplitude are both higher than the threshold, an early warning prompt instruction is generated.

[0103] In this embodiment, the threshold corresponding to the real-time horizontal vibration amplitude is set to 2.3 mm, and the threshold corresponding to the real-time vertical vibration amplitude is set to 2.0 mm. The set values ​​are related to the measurement accuracy of the vibration sensor, the safety requirements of the battery pack module under test, the operating environment, and the type of battery under test.

[0104] Specifically, the periodic monitoring unit obtains the real-time battery temperature at any of the monitoring points in each monitoring period, and determines the real-time battery temperature according to the first standard temperature and the second standard temperature.

[0105] If the real-time battery temperature is lower than the first standard temperature, the low temperature protection control instruction generating subunit generates a second low temperature protection control instruction;

[0106] If the real-time battery temperature is between the first standard temperature and the second standard temperature, the low temperature protection control instruction generating subunit generates a third low temperature protection control instruction;

[0107] If the real-time battery temperature is greater than the second standard temperature, the low temperature protection control instruction generating subunit generates a first low temperature protection control instruction.

[0108] Specifically, the low temperature protection control strategy corresponding to the third low temperature protection control instruction is to start the charging heat preservation waiting control mode. When the time reaches the start time, if the real-time difference vibration frequency is still large, the charging heat preservation control mode is started.

[0109] The low temperature protection control strategy corresponding to the second low temperature protection control instruction is to start the charging heat preservation control mode;

[0110] The low temperature protection control strategy corresponding to the first low temperature protection control instruction is to start the sleep control mode;

[0111] The warning prompt instruction is to issue a warning prompt instruction to reduce the vehicle speed;

[0112] Among them, when the actual battery temperature reaches the standard exit temperature, the charging insulation control mode is exited and the electric insulation waiting control mode is entered. The standard exit temperature is 27°C and the start-up time is 3 hours.

[0113] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0114] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An adaptive battery insulation system in a low temperature environment, characterized in that: include, A data acquisition module, comprising a plurality of temperature sensors arranged at various detection points, and a vibration sensor arranged inside the housing of the battery pack module, wherein the data acquisition module is used to obtain temperature change data of the single battery through the temperature sensors, and to obtain vibration data of the battery pack module through the vibration sensor; A battery heating module, which is arranged inside the battery pack to be tested and can be activated by a power supply to raise the actual battery temperature to within a standard operating temperature range; A data processing module, connected to the data acquisition module, for processing the vibration data to obtain a real-time monitoring data set and a periodic monitoring data set; a heat preservation control module connected to the data processing module, and used to analyze the vibration state of the battery pack module according to the real-time monitoring data set, and to analyze the temperature state of the battery pack module according to the periodic monitoring data set, so as to generate a corresponding low temperature protection control instruction or a warning prompt instruction; The heat preservation control module includes a real-time monitoring unit, a correlation monitoring unit, a heat preservation control unit and a regular monitoring unit, wherein: The real-time monitoring unit is used to preliminarily determine the degree of influence of vibration on the battery pack module according to the real-time monitoring data set; The correlation monitoring unit is used to analyze the influence degree of vibration on the thermal insulation performance of the battery pack module according to the influence degree correlation temperature data, and obtain the correlation analysis result; The periodic monitoring unit is used to periodically monitor the influence of temperature on the battery pack module according to the periodic monitoring data set to obtain a periodic monitoring result; The heat preservation control unit generates a corresponding low temperature protection control instruction or a warning prompt instruction according to the correlation analysis result and the regular monitoring result, responds to the low temperature protection control strategy according to the low temperature protection control instruction, and outputs a warning prompt indication according to the warning prompt instruction; The associated monitoring unit includes a temperature analysis subunit and an alarm prompt subunit, wherein: The temperature analysis subunit analyzes the real-time battery temperature of each of the single cells according to the lowest standard temperature and the second standard temperature to obtain the influence of the vibration on the thermal insulation performance of the battery pack module; The alarm prompt subunit is used to generate an alarm prompt instruction and send it to an external management terminal when the real-time battery temperature is lower than the minimum standard temperature; The association monitoring unit further includes an amplitude analysis subunit, The amplitude analysis subunit is used to obtain the real-time horizontal vibration amplitude and the real-time vertical vibration amplitude for analysis when the real-time battery temperature is between the lowest standard temperature and the second standard temperature, so as to obtain the correlation analysis result; The heat preservation control unit includes a low temperature protection control instruction generation subunit and a warning prompt instruction generation subunit, wherein: The low temperature protection control instruction generating subunit is used to generate a first low temperature protection control instruction when the real-time horizontal vibration amplitude and the real-time vertical vibration amplitude are both lower than a threshold value, and to generate a second low temperature protection control instruction when the real-time horizontal vibration amplitude or the real-time vertical vibration amplitude is higher than the threshold value; The early warning prompt instruction generating subunit is used to generate an early warning prompt instruction when the real-time horizontal vibration amplitude and the real-time vertical vibration amplitude are both higher than the threshold value; A temperature control execution module, which is connected to the heat preservation control module and the battery heating module, and is used to receive the low temperature protection control instruction or the early warning prompt instruction, execute the low temperature protection control strategy and output the early warning prompt instruction; The low temperature protection control strategy includes a charging and heat preservation control mode, a charging and heat preservation waiting control mode and a sleep control mode; The low temperature protection control strategy corresponding to the second low temperature protection control instruction is to start the charging heat preservation control mode; The low temperature protection control strategy corresponding to the first low temperature protection control instruction is to start the sleep control mode; The early warning prompt instruction is to issue an early warning prompt instruction to reduce the vehicle speed.

2. The adaptive battery insulation system in low temperature environment according to claim 1, characterized in that: The data processing module includes a data judgment unit and a data storage unit, wherein: The data judgment unit is used to judge the real-time vibration displacement according to the set standard displacement fluctuation range to determine whether the real-time vibration displacement falls within the standard displacement fluctuation range; The data storage unit is used to store the vibration data corresponding to the real-time vibration displacement falling within the standard displacement fluctuation range into the periodic monitoring data set, and to store the vibration data corresponding to the real-time vibration displacement not falling within the standard displacement fluctuation range into the real-time monitoring data set.

3. The adaptive battery insulation system in a low temperature environment according to claim 1, characterized in that: The real-time monitoring unit includes an acquisition subunit and a determination subunit, wherein: The acquisition subunit is used to calculate the real-time difference vibration ratio based on the number of difference vibration displacements in the real-time monitoring data set; The determination subunit is used to determine the real-time difference vibration ratio according to the standard difference vibration ratio, and determine the influence degree of the vibration on the battery pack module according to the determination result; When it is determined that the real-time difference vibration ratio is greater than or equal to the standard difference vibration ratio, the associated monitoring unit associates the temperature change data for analysis; Among them, the real-time differential vibration ratio is the percentage of the number of differential vibration displacements in the real-time monitoring data set to the total number of collection points within a preset time interval; the temperature change data includes the real-time battery temperature corresponding to each of the single cells.

4. The adaptive battery insulation system in a low temperature environment according to claim 2, characterized in that: The low temperature protection control instruction generation subunit generates a corresponding low temperature protection control instruction based on the periodic monitoring result; Wherein, when the real-time battery temperature is lower than the first standard temperature, a second low temperature protection control instruction is generated; When the real-time battery temperature is between the first standard temperature and the second standard temperature, generating a third low temperature protection control instruction; When the real-time battery temperature is greater than the second standard temperature, a first low temperature protection control instruction is generated.

5. The adaptive battery insulation system in low temperature environment according to claim 4, characterized in that: The low temperature protection control strategy corresponding to the third low temperature protection control instruction is to start the charging and heat preservation waiting control mode. When the time reaches the preset start time, if it is still determined that the real-time difference vibration ratio is greater than or equal to the standard difference vibration ratio, the charging and heat preservation control mode is started.

6. The adaptive battery insulation system in a low temperature environment according to claim 1, characterized in that: The battery pack module includes a plurality of single cells, and a corresponding detection point is arranged inside the housing of each single cell; The temperature sensor is used to collect the real-time battery temperature at each of the detection points.

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