Battery pack charging safety detection method and system

Abstract

The present invention provides a battery pack charging safety detection method and system, which relates to the field of battery detection technology. The method includes: obtaining battery pack information of a battery pack at the initial moment of a detection cycle; obtaining charging device information of a charging device at multiple moments of a detection cycle; determining a charging device safety detection score based on the charging device information and the battery pack information; obtaining charging environment information of a charging environment at multiple moments of a detection cycle; determining a charging environment safety detection score based on the charging environment information; obtaining battery temperature data and battery power data at multiple moments of a detection cycle; determining a battery pack status safety detection score based on the battery temperature data, battery power data, and output current; and generating a detection report. According to the present invention, the battery pack charging safety can be comprehensively detected through three aspects: the safety status of the charging device, the safety status of the charging environment, and the safety status of the charging pack.

Description

Technical Field

[0001] The present invention relates to the field of battery detection technology, and in particular to a battery pack charging safety detection method and system. Background Art

[0002] In the related art, CN108539302A discloses a charge and discharge detection device for electric vehicle power battery, which includes a detection connection plug and a detection unit; the detection connection plug is connected to the detection unit through a connection harness; the detection connection plug cooperates with the electric vehicle DC charging socket; by inserting the detection plug into the electric vehicle DC charging socket, the detection unit can be electrically connected to the electric vehicle power battery, thereby directly performing charge and discharge tests on the power battery. This solution can perform charge and discharge tests without disassembling the electric vehicle power battery, simplifying the test process; bidirectional communication is performed through the CAN communication function, and the test results can be fed back to the power battery, making it convenient for the electric vehicle to calibrate the power battery parameters; at the same time, the charge and discharge status is independently confirmed by means of resistance, avoiding damage to the battery due to incorrect settings or operations, thereby increasing the safety and reliability of the system.

[0003] CN110311183B discloses a charging and discharging protection method and device for a lithium battery pack, including: detecting whether the ambient temperature is greater than a preset low temperature point; if the ambient temperature is greater than the preset low temperature point, determining whether the battery terminal voltage is less than a preset charging setting voltage; if the battery terminal voltage is less than the charging setting voltage, executing a corresponding charging mode according to the numerical value of the battery terminal voltage until the battery terminal voltage is equal to the charging setting voltage. This scheme executes a corresponding charging mode according to the numerical value of the battery terminal voltage when the battery terminal voltage is less than the charging setting voltage. It can be understood that there is a mapping relationship between the numerical value of the battery terminal voltage and the charging mode, so the corresponding charging mode is executed as the numerical value of the battery terminal voltage changes, so that the lithium battery pack can be charged more safely.

[0004] Based on the above-mentioned related technologies, the technical problem of being unable to improve the charging safety and reliability of the battery pack can be solved. However, the related technologies do not take into account the impact of the charging equipment and the charging environment on the charging safety during the charging process of the battery pack. That is, it is impossible to conduct a comprehensive detection of the charging safety of the battery pack based on the charging equipment information and the charging environment information during the charging process of the battery pack.

[0005] The information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0006] The present invention provides a battery pack charging safety detection method and system, which can solve the technical problem that the related technology cannot perform a comprehensive detection of the battery pack charging safety according to the charging device information and the charging environment information during the battery pack charging process.

[0007] According to a first aspect of the present invention, a battery pack charging safety detection method is provided, comprising:

[0008] At the initial moment of the detection cycle, obtaining battery pack information of the battery pack, wherein the battery pack information includes: a rated voltage and a rated current;

[0009] At multiple moments in the detection cycle, acquiring charging device information of the charging device, wherein the charging device information includes: output voltage and output current;

[0010] Determine the charging device safety detection score at the jth moment in the detection cycle according to the charging device information and the battery pack information;

[0011] At multiple moments in the detection cycle, acquiring charging environment information of the charging environment, wherein the charging environment information includes: temperature data, humidity data, wind data, and light data;

[0012] Determine the charging environment safety detection score at the jth moment in the detection period according to the charging environment information;

[0013] At multiple times during the detection cycle, obtaining battery temperature data and battery power data when the battery pack is charging;

[0014] Determine the battery pack status safety detection score at the jth moment of the detection cycle according to the battery temperature data, the battery power data and the output current;

[0015] A detection report at the jth moment in the detection cycle is generated based on the charging equipment safety detection score, the charging environment safety detection score and the battery pack status safety detection score at the jth moment in the detection cycle.

[0016] According to a second aspect of the present invention, a battery pack charging safety detection system is provided, comprising:

[0017] A battery pack information module, used to obtain battery pack information of the battery pack at the initial moment of the detection cycle, wherein the battery pack information includes: rated voltage and rated current;

[0018] A charging device information module, used to obtain charging device information of the charging device at multiple times in the detection cycle, wherein the charging device information includes: output voltage and output current;

[0019] A charging device safety module, used to determine a charging device safety detection score at the jth moment of a detection cycle according to the charging device information and the battery pack information;

[0020] A charging environment information module, used to obtain charging environment information of the charging environment at multiple moments in a detection cycle, wherein the charging environment information includes: temperature data, humidity data, wind data and light data;

[0021] A charging environment safety module, used to determine a charging environment safety detection score at the jth moment in a detection period according to the charging environment information;

[0022] The battery pack data module is used to obtain the battery temperature data and battery power data of the battery pack when it is being charged at multiple times during the detection cycle;

[0023] A battery pack status safety module, used to determine a battery pack status safety detection score at the jth moment of a detection cycle according to the battery temperature data, the battery power data and the output current;

[0024] The detection report module is used to generate a detection report at the jth moment in the detection cycle based on the charging equipment safety detection score, the charging environment safety detection score and the battery pack status safety detection score at the jth moment in the detection cycle.

[0025] According to a third aspect of the present invention, a battery pack charging safety detection device is provided, comprising: a processor; a memory for storing processor executable instructions; wherein the processor is configured to call the instructions stored in the memory to execute the battery pack charging safety detection method.

[0026] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium having computer program instructions stored thereon, wherein the computer program instructions implement the battery pack charging safety detection method when executed by a processor.

[0027] Technical effect: According to the present invention, the battery pack charging safety can be comprehensively tested through three aspects: the safety status of the charging equipment, the safety status of the charging environment, and the safety status of the charging pack, thereby improving the comprehensiveness, objectivity, and accuracy of the battery pack charging safety test. When determining the electric equipment safety test score, the charging equipment safety test score can be determined based on the output voltage, output current, battery pack charging vector, and charging equipment charging vector. In the calculation process, the matching of the charging equipment and the battery pack and the charging stability of the charging equipment are fully considered to improve the comprehensiveness and accuracy of the charging equipment safety test score. When determining the ambient temperature recognition result, the ambient temperature recognition result is determined based on the temperature data and the illumination data. In the calculation process, the influence of the illumination data on the temperature data is fully considered to improve the comprehensiveness and accuracy of the ambient temperature recognition result. When determining the ambient humidity recognition result, the ambient humidity recognition result can be determined based on the humidity data and the wind data. In the calculation process, the influence of the wind data on the humidity data is fully considered to improve the comprehensiveness and accuracy of the ambient humidity recognition result. When determining the battery pack status safety detection score, the battery pack status safety detection score can be determined based on the first function, the second function, the battery power data and the battery temperature data change rate. During the calculation process, the safety status of the battery pack during the charging process is determined from two aspects: the battery pack charging energy utilization rate and the battery pack temperature, thereby improving the scientificity, accuracy and objectivity of the battery pack status safety detection score.

[0028] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and do not limit the present invention. Other features and aspects of the present invention will become more apparent from the following detailed description of exemplary embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other embodiments can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic diagram exemplarily shows a flow chart of a battery pack charging safety detection method according to an embodiment of the present invention;

[0031] Figure 2 A block diagram of a battery pack charging safety detection system according to an embodiment of the present invention is exemplarily shown. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0034] Figure 1 A schematic diagram of a process flow of a battery pack charging safety detection method according to an embodiment of the present invention is exemplarily shown, the method comprising:

[0035] Step S101, at the initial moment of the detection cycle, obtaining battery pack information of the battery pack, wherein the battery pack information includes: rated voltage and rated current;

[0036] Step S102, acquiring charging device information of the charging device at multiple moments in the detection cycle, wherein the charging device information includes: output voltage and output current;

[0037] Step S103, determining the charging device safety detection score at the jth moment in the detection cycle according to the charging device information and the battery pack information;

[0038] Step S104, acquiring charging environment information of the charging environment at multiple moments in the detection cycle, wherein the charging environment information includes: temperature data, humidity data, wind data, and light data;

[0039] Step S105, determining the charging environment safety detection score at the jth moment in the detection cycle according to the charging environment information;

[0040] Step S106, obtaining battery temperature data and battery power data when the battery pack is charging at multiple times during the detection cycle;

[0041] Step S107, determining a battery pack status safety detection score at the jth moment of the detection cycle according to the battery temperature data, the battery power data and the output current;

[0042] Step S108, generating a detection report at the jth moment in the detection cycle according to the charging equipment safety detection score, the charging environment safety detection score and the battery pack status safety detection score at the jth moment in the detection cycle.

[0043] According to the battery pack charging safety detection method of an embodiment of the present invention, the battery pack charging safety can be comprehensively detected from three aspects: the safety status of the charging equipment, the safety status of the charging environment and the safety status of the charging pack, thereby improving the comprehensiveness, objectivity and accuracy of the battery pack charging safety detection.

[0044] According to an embodiment of the present invention, in step S101, at the initial moment of the detection cycle, battery pack information of the battery pack is acquired, wherein the battery pack information includes: rated voltage and rated current.

[0045] For example, the rated voltage and rated current of the battery pack are determined based on the data provided by the battery pack manufacturer.

[0046] According to an embodiment of the present invention, in step S102, charging device information of the charging device is acquired at multiple moments in the detection cycle, wherein the charging device information includes: output voltage and output current.

[0047] For example, at multiple times during the detection cycle, the output voltage and output current of the charging device are detected by a multimeter.

[0048] According to an embodiment of the present invention, in step S103, the charging device safety detection score at the jth moment in the detection cycle is determined based on the charging device information and the battery pack information.

[0049] According to one embodiment of the present invention, step S103 includes:

[0050] Determining a rated charging state vector of the battery pack according to the rated voltage and the rated current;

[0051] Determine a charging state vector of a charging device according to the output voltage and the output current;

[0052] Determine the charging device safety detection score at the jth moment in the detection cycle based on the output voltage, output current, battery pack charging rated state vector and charging device charging state vector.

[0053] For example, the rated voltage and rated current represent the voltage level that the battery pack should reach under normal working conditions and the maximum current value that can be safely provided under normal working conditions, which together reflect the electrical performance and safety performance of the battery pack. The rated charging state vector of the battery pack is determined based on the rated voltage and rated current. The output voltage and output current reflect the electrical characteristics of the output device when it is working. The charging state vector of the charging device is determined by the output voltage and output current.

[0054] According to one embodiment of the present invention, the charging device safety detection score at the jth moment of the detection cycle is determined according to the output voltage, the output current, the battery pack charging rated state vector and the charging device charging state vector, including: determining the charging device safety detection score CE at the jth moment of the detection cycle according to formula (1): s，j ,

[0055]

[0056] Among them, α1 and α2 are preset weights, V ce，1 is the output voltage of the charging device at the initial moment of the detection cycle, I ce，1 is the output current of the charging device at the initial moment of the detection cycle, is the charging state vector of the charging device at the initial moment of the detection cycle, v cb，rv is the rated voltage of the battery pack, I cb，ri is the rated current of the battery pack, Charge the battery pack to the rated state vector, v' ce (j) is the output voltage change rate of the charging device at the jth moment of the detection cycle, I' ce (j) is the output current change rate of the charging device at the jth moment of the detection cycle, v' t is the preset output voltage change rate, I' t is the preset output current change rate, and j is a positive integer.

[0057] According to an embodiment of the present invention, the following two situations can be expressed in the form of a piecewise function. When j=1, at the initial moment of the detection cycle, the value of the piecewise function is When j>1, at multiple moments in the detection cycle, the value of the piecewise function is

[0058] According to one embodiment of the present invention, when j=1, It is the cosine similarity between the charging state vector of the charging device at the initial moment of the detection cycle and the rated charging state vector of the battery pack. The closer this cosine similarity is to 1, the higher the matching degree between the output current and output voltage of the charging device and the rated current and rated voltage of the battery pack at the initial moment of the detection cycle. If the charging current is too small, the charging speed will be too slow. If the charging current is too large, the battery pack may be overcharged, increasing the risk of damage to the charging pack.

[0059] According to one embodiment of the present invention, when j>1, It is the ratio of the difference between the output voltage change rate of the charging device at the jth moment of the detection cycle and the preset output voltage change rate to the preset output voltage change rate. The larger the ratio is, the greater the output voltage fluctuation of the charging device exceeds the preset output voltage fluctuation range, resulting in a greater risk of damage to the charging pack, and a lower charging device safety detection score. It is the ratio of the difference between the output current change rate of the charging device at the jth moment of the detection cycle and the preset output current change rate to the preset output current change rate. The larger the ratio is, the greater the output current fluctuation of the charging device exceeds the preset output current fluctuation range, resulting in a greater risk of damage to the charging pack and a lower charging device safety detection score. The charging device safety detection score is determined based on the fluctuation of the output voltage and the output current of the charging device. The higher the charging device safety detection score is, the more stable the charging condition of the charging device is.

[0060] In this way, the charging equipment safety detection score is determined based on the output voltage, output current, battery pack charging vector and charging device charging vector. During the calculation process, the matching between the charging device and the battery pack and the charging stability of the charging device are fully considered to improve the comprehensiveness and accuracy of the charging equipment safety detection score.

[0061] According to an embodiment of the present invention, in step S104, charging environment information of the charging environment is acquired at multiple moments in the detection cycle, wherein the charging environment information includes: temperature data, humidity data, wind data and light data.

[0062] For example, at multiple moments in the detection cycle, the temperature, humidity, wind speed, and light intensity of the charging environment are acquired through a temperature sensor, a humidity sensor, a wind speed sensor, and a light speed sensor.

[0063] According to an embodiment of the present invention, in step S105, a charging environment safety detection score at the jth moment in the detection period is determined according to the charging environment information.

[0064] According to one embodiment of the present invention, step S105 includes:

[0065] Determine the ambient temperature recognition result at the jth moment of the detection period according to the temperature data and the light data;

[0066] Determine the environmental humidity recognition result at the jth moment of the detection period according to the humidity data and the wind speed data;

[0067] The charging environment safety detection score at the jth moment in the detection cycle is determined according to the ambient temperature identification result at the jth moment in the detection cycle and the ambient humidity identification result at the jth moment in the detection cycle.

[0068] For example, when the ambient temperature identification result and the ambient humidity identification result are both greater than 0, the charging environment safety detection score is greater than 0; when the ambient temperature identification result and the ambient humidity identification result are both less than 0, or one of them is less than 0, the charging environment safety detection score is less than 0; when the charging environment safety detection score is greater than 0, the charging environment meets the safety standards; when the charging environment safety detection score is less than 0, the charging environment does not meet the safety standards.

[0069] According to an embodiment of the present invention, determining the ambient temperature recognition result at the jth moment of the detection period according to the temperature data and the illumination data includes: determining the ambient temperature recognition result TEE at the jth moment of the detection period according to formula (2): j ,

[0070]

[0071] Among them, L j is the illumination data at the jth moment of the detection cycle, L t is the preset light threshold, T j is the temperature data at the jth moment of the detection cycle, is the first preset temperature threshold, is the second preset temperature threshold,

[0072] According to one embodiment of the present invention, It is the ratio of the light data at the jth moment of the detection cycle to the preset light threshold. When the light intensity is greater, the actual temperature of the charging environment where the charging pack is located will be greater than the temperature data detected by the temperature sensor due to direct sunlight. The product of the ratio of the illumination data at the jth moment of the detection period to the preset illumination threshold and the temperature data at the jth moment of the detection period represents the actual temperature data after considering the influence of the illumination data. is the difference between the first preset temperature threshold and the actual temperature data, is the difference between the actual temperature data and the second preset temperature threshold. when Actual temperature data When the ambient temperature recognition result is greater than 0, the temperature of the charging environment meets the standard. When the actual temperature is too low, charging and discharging operations will reduce the battery life and charging safety is low. The ambient temperature recognition result is less than 0, and the temperature of the charging environment does not meet the standard. When the actual temperature data is displayed, it means that the actual temperature is too high, charging will cause the battery pack to overheat, the charging safety is low, and the ambient temperature recognition result at the jth moment is less than 0.

[0073] In this way, the ambient temperature recognition result is determined based on the temperature data and the illumination data. During the calculation process, the influence of the illumination data on the temperature data is fully considered, thereby improving the comprehensiveness and accuracy of the ambient temperature recognition result.

[0074] According to an embodiment of the present invention, determining the environmental humidity identification result at the jth moment of the detection period according to the humidity data and the wind speed data includes: determining the environmental humidity identification result HEE at the jth moment of the detection period according to formula (3): j ,

[0075]

[0076] Among them, H j is the humidity data at the jth moment of the detection period, F j is the wind force data at the jth moment of the detection period, H t is the preset humidity threshold, F t The preset wind speed threshold.

[0077] According to one embodiment of the present invention, when the wind data increases, the air flow will take away the latent heat, causing the humidity sensor measurement result to be low. is the ratio of the humidity data at the jth moment of the detection period to the ratio of the wind data at the jth moment of the detection period to the preset wind threshold, which represents the actual humidity data after eliminating the interference of the wind data factor. It is the difference between the preset humidity threshold and the actual humidity data. When the difference is less than 0, it means that the actual humidity data is greater than the preset humidity threshold. Excessive humidity will affect the internal chemical reaction of the battery, which may cause corrosion and circuit short circuit in electronic equipment, and low charging safety. The environmental humidity recognition result at the jth moment is less than 0.

[0078] In this way, the environmental humidity recognition result is determined based on the humidity data and wind data. During the calculation process, the influence of wind data on humidity data is fully considered, which improves the comprehensiveness and accuracy of the environmental humidity recognition result.

[0079] According to an embodiment of the present invention, in step S106, the battery temperature data and the battery power data of the battery pack when it is being charged are acquired at multiple times in the detection cycle.

[0080] For example, at multiple times during the detection cycle, the battery temperature data and battery power data of the battery pack when it is being charged are obtained through the battery management system.

[0081] According to an embodiment of the present invention, in step S107, the battery pack status safety detection score at the jth moment of the detection cycle is determined according to the battery temperature data, the battery power data and the output current.

[0082] According to one embodiment of the present invention, step S107 includes:

[0083] Determine a battery pack status safety detection score based on the battery temperature data, battery power data, and output current, including:

[0084] Continuously obtain the battery temperature data, battery power data, and output current at J moments before the current moment, where J is greater than 1 and is a positive integer;

[0085] Fitting the battery temperature data and J moments to obtain a first function of the battery temperature data in a detection cycle;

[0086] Fitting the output current and J moments to obtain a second function of the output current in a detection period;

[0087] According to the first function, obtaining a first derivative function;

[0088] Determine the battery temperature data change rate at J moments according to the first derivative function;

[0089] The battery pack status safety detection score at the jth moment in the detection cycle is determined based on the first function, the second function, the battery power data, and the change rate of the battery temperature data.

[0090] For example, the battery temperature data and output power are continuously acquired during the detection period, the battery temperature data and J moments are fitted to obtain a first function for the battery temperature rising over time in the J moments; the output current and J moments are fitted to obtain a second function for the output power changing over time in the J moments; the first function is differentiated to obtain a first derivative function, and the J moments are substituted into the first derivative function to determine the rate of change of the battery temperature data at the J moments; the battery pack status safety detection score is determined based on the first function, the second function, the battery power data and the rate of change of the battery temperature data.

[0091] According to an embodiment of the present invention, determining the battery pack state safety detection score at the jth moment of the detection cycle according to the first function, the second function, the battery power data and the battery temperature data change rate includes: determining the battery pack state safety detection score EB at the jth moment of the detection cycle according to formula (4),

[0092]

[0093] Where β1 and β2 are preset weights, I(t) is the second function of the output current in the detection cycle, and t J is the Jth moment of the detection cycle, t1 is the initial moment of the detection cycle, BL JTo detect the battery power data at the Jth moment of the cycle, To detect the battery power data at the beginning of the cycle, EC t is the preset energy utilization rate threshold, CT(j) is the battery temperature data at the jth moment, and CT t is the preset battery temperature data threshold, CT'1(j) is the battery temperature data change rate at the jth moment, KT' t is the preset battery temperature data change rate threshold, j≤J, and both j and J are positive integers.

[0094] According to an embodiment of the present invention, is the difference between the battery power data at the Jth moment of the detection cycle and the battery power data at the initial moment of the detection cycle, indicating the actual charging capacity at the Jth moment. The output current is integrated over J moments, which represents the total charge transferred by the charging device during the charging process at J moments. It is the ratio of the actual charge at J moments to the total charge transferred by the charging device during the charging process, which indicates the energy utilization rate of the battery. The ratio of the difference between the battery's energy utilization rate and the preset energy utilization rate threshold to the difference between the preset energy utilization rate threshold. The smaller the ratio, the lower the battery's energy utilization rate, the battery pack may be aged or the battery pack's internal resistance is too large, and the battery pack status safety detection score is lower. max j∈[1，J] CT(j) is the maximum value of the battery temperature data of the battery pack at J moments, It is the ratio of the difference between the preset battery temperature data threshold and the maximum value of the battery temperature data of the battery pack at J moments to the preset battery temperature data threshold. When the ratio is less than 0, it means that the battery pack temperature data is too large, the battery pack temperature is abnormal, and the battery pack status safety detection score is lower. The battery temperature data change rate is the summed average value of the battery temperature data change rate at J moments, indicating the average battery temperature data change rate within J moments. It is the ratio of the difference between the preset battery temperature data change rate threshold and the average battery temperature data change rate within J moments to the preset battery temperature data change rate threshold. When the ratio is less than 0, it means that the battery pack temperature data change rate is abnormal, the battery pack temperature changes abnormally, and the battery pack status safety detection score is lower.

[0095] In this way, the battery pack status safety detection score is determined based on the first function, the second function, the battery power data and the battery temperature data change rate. During the calculation process, the safety status of the battery pack during the charging process is determined from two aspects: the battery pack charging energy utilization rate and the battery pack temperature, thereby improving the scientificity, accuracy and objectivity of the battery pack status safety detection score.

[0096] According to one embodiment of the present invention, in step S108, a detection report at the jth moment in the detection cycle is generated based on the charging equipment safety detection score, the charging environment safety detection score and the battery pack status safety detection score at the jth moment in the detection cycle.

[0097] For example, at the jth moment of the detection cycle, when the charging equipment safety detection score is less than the set threshold, a charging equipment safety alarm is generated to remind the user. At the jth moment of the detection cycle, when the charging environment safety detection score is less than 0, a charging environment safety alarm is generated to remind the user. At the jth moment of the detection cycle, when the battery pack status safety detection score is less than the set threshold, a battery pack status safety alarm is generated to remind the user.

[0098] According to the battery pack charging safety detection method of the embodiment of the present invention, the battery pack charging safety can be comprehensively detected through the three aspects of the charging equipment safety status, the charging environment safety status and the charging pack safety status, thereby improving the comprehensiveness, objectivity and accuracy of the battery pack charging safety detection. When determining the electric equipment safety detection score, the charging equipment safety detection score can be determined based on the output voltage, output current, battery pack charging vector and charging equipment charging vector. In the calculation process, the matching of the charging equipment and the battery pack and the charging stability of the charging equipment are fully considered to improve the comprehensiveness and accuracy of the charging equipment safety detection score. When determining the ambient temperature recognition result, the ambient temperature recognition result is determined based on the temperature data and the illumination data. In the calculation process, the influence of the illumination data on the temperature data is fully considered to improve the comprehensiveness and accuracy of the ambient temperature recognition result. When determining the ambient humidity recognition result, the ambient humidity recognition result can be determined based on the humidity data and the wind data. In the calculation process, the influence of the wind data on the humidity data is fully considered to improve the comprehensiveness and accuracy of the ambient humidity recognition result. When determining the battery pack status safety detection score, the battery pack status safety detection score can be determined based on the first function, the second function, the battery power data and the battery temperature data change rate. During the calculation process, the safety status of the battery pack during the charging process is determined from two aspects: the battery pack charging energy utilization rate and the battery pack temperature, thereby improving the scientificity, accuracy and objectivity of the battery pack status safety detection score.

[0099] Figure 2 A block diagram of a battery pack charging safety detection system according to an embodiment of the present invention is exemplarily shown, and the system includes:

[0100] A battery pack information module, used to obtain battery pack information of the battery pack at the initial moment of the detection cycle, wherein the battery pack information includes: rated voltage and rated current;

[0101] A charging device information module, used to obtain charging device information of the charging device at multiple times in the detection cycle, wherein the charging device information includes: output voltage and output current;

[0102] A charging device safety module, used to determine a charging device safety detection score at the jth moment of a detection cycle according to the charging device information and the battery pack information;

[0103] A charging environment information module, used to obtain charging environment information of the charging environment at multiple moments in a detection cycle, wherein the charging environment information includes: temperature data, humidity data, wind data and light data;

[0104] A charging environment safety module, used to determine a charging environment safety detection score at the jth moment in a detection period according to the charging environment information;

[0105] The battery pack data module is used to obtain the battery temperature data and battery power data of the battery pack when it is being charged at multiple times during the detection cycle;

[0106] A battery pack status safety module, used to determine a battery pack status safety detection score at the jth moment of a detection cycle according to the battery temperature data, the battery power data and the output current;

[0107] The detection report module is used to generate a detection report at the jth moment in the detection cycle based on the charging equipment safety detection score, the charging environment safety detection score and the battery pack status safety detection score at the jth moment in the detection cycle.

[0108] According to one embodiment of the present invention, a battery pack charging safety detection device is provided, comprising: a processor; a memory for storing processor executable instructions; wherein the processor is configured to call the instructions stored in the memory to execute the battery pack charging safety detection method.

[0109] According to one embodiment of the present invention, there is provided a computer-readable storage medium having computer program instructions stored thereon, wherein the computer program instructions implement the battery pack charging safety detection method when executed by a processor.

[0110] The present invention may be a method, an apparatus, a system and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for executing various aspects of the present invention.

[0111] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack charging safety detection method, characterized in that: include: At the initial moment of the detection cycle, obtaining battery pack information of the battery pack, wherein the battery pack information includes: a rated voltage and a rated current; At multiple moments in the detection cycle, acquiring charging device information of the charging device, wherein the charging device information includes: output voltage and output current; Determine the charging device safety detection score at the jth moment in the detection cycle according to the charging device information and the battery pack information; At multiple moments in the detection cycle, acquiring charging environment information of the charging environment, wherein the charging environment information includes: temperature data, humidity data, wind data, and light data; Determine the charging environment safety detection score at the jth moment in the detection period according to the charging environment information; At multiple times during the detection cycle, obtaining battery temperature data and battery power data when the battery pack is charging; Determine the battery pack status safety detection score at the jth moment of the detection cycle according to the battery temperature data, the battery power data and the output current; Generate a test report at the jth moment in the test cycle according to the charging equipment safety test score, the charging environment safety test score and the battery pack status safety test score at the jth moment in the test cycle; Determining the charging device safety detection score at the jth moment of the detection cycle according to the charging device information and the battery pack information, including: Determining a rated charging state vector of the battery pack according to the rated voltage and the rated current; Determine a charging state vector of a charging device according to the output voltage and the output current; Determine the charging device safety detection score at the jth moment of the detection cycle according to the output voltage, the output current, the battery pack charging rated state vector and the charging device charging state vector; Determining a charging device safety detection score at the jth moment of a detection cycle according to the output voltage, the output current, the battery pack charging rated state vector, and the charging device charging state vector, including: Fitting the output voltage, the output current and the time in the detection period to obtain an output voltage function of the output voltage and an output current function of the output current in the detection period; Determine the output voltage change rate and the output current change rate at multiple moments in the detection cycle according to the output voltage function and the output current function; According to the formula Determine the charging equipment safety detection score CE at the jth moment of the detection cycle s，j , where α1 and α2 are preset weights, v ce，1 is the output voltage of the charging device at the initial moment of the detection cycle, I ce，1 is the output current of the charging device at the initial moment of the detection cycle, is the charging state vector of the charging device at the initial moment of the detection cycle, v cb，rv is the rated voltage of the battery pack, I cb，ri is the rated current of the battery pack, Charge the battery pack to the rated state vector, v' ce (j) is the output voltage change rate of the charging device at the jth moment of the detection cycle, I' ce (j) is the output current change rate of the charging device at the jth moment of the detection cycle, v' t is the preset output voltage change rate, I' t is the preset output current change rate, j is a positive integer; Determine the battery pack status safety detection score at the jth moment of the detection cycle according to the battery temperature data, the battery power data and the output current, including: Continuously obtain the battery temperature data, battery power data, and output current at J moments before the current moment, where J is greater than 1 and is a positive integer; Fitting the battery temperature data and J moments to obtain a first function of the battery temperature data in a detection cycle; Fitting the output current and J moments to obtain a second function of the output current in a detection period; According to the first function, obtaining a first derivative function; Determine the battery temperature data change rate at J moments according to the first derivative function; Determine the battery pack status safety detection score at the jth moment of the detection period according to the first function, the second function, the battery power data and the battery temperature data change rate; Determining the battery pack status safety detection score at the jth moment of the detection cycle according to the first function, the second function, the battery power data, and the battery temperature data change rate, including: According to the formula Determine the battery pack status safety detection score EB at the jth moment of the detection cycle, where β1 and β2 are preset weights, I(t) is the second function of the output current in the detection cycle, t J is the Jth moment of the detection cycle, t1 is the initial moment of the detection cycle, BL J To detect the battery power data at the Jth moment of the cycle, To detect the battery power data at the beginning of the cycle, EC t is the preset energy utilization rate threshold, CT(j) is the battery temperature data at the jth moment, and CT t is the preset battery temperature data threshold, CT'1(j) is the battery temperature data change rate at the jth moment, KT' t is the preset battery temperature data change rate threshold, j≤J, and both j and J are positive integers.

2. The battery pack charging safety detection method according to claim 1, characterized in that: Determining the charging environment safety detection score at the jth moment in the detection period according to the charging environment information includes: Determine the ambient temperature recognition result at the jth moment of the detection period according to the temperature data and the light data; Determine the environmental humidity recognition result at the jth moment of the detection period according to the humidity data and the wind speed data; The charging environment safety detection score at the jth moment in the detection cycle is determined according to the ambient temperature identification result at the jth moment in the detection cycle and the ambient humidity identification result at the jth moment in the detection cycle.

3. The battery pack charging safety detection method according to claim 2, characterized in that: Determining the ambient temperature recognition result at the jth moment of the detection period according to the temperature data and the light data includes: According to the formula Determine the ambient temperature recognition result TEE at the jth moment of the detection cycle j , where L j is the illumination data at the jth moment of the detection cycle, L t is the preset light threshold, T j is the temperature data at the jth moment of the detection cycle, is the first preset temperature threshold, is the second preset temperature threshold, 4. The battery pack charging safety detection method according to claim 2, characterized in that: Determining the environmental humidity recognition result at the jth moment of the detection period according to the humidity data and the wind speed data, including: According to the formula Determine the environmental humidity recognition result HEE at the jth moment of the detection cycle j , where H j is the humidity data at the jth moment of the detection period, F j is the wind force data at the jth moment of the detection period, H t is the preset humidity threshold, F t The preset wind speed threshold.

5. A battery pack charging safety detection system for executing the method according to any one of claims 1 to 4, characterized in that: include: A battery pack information module, used to obtain battery pack information of the battery pack at the initial moment of the detection cycle, wherein the battery pack information includes: rated voltage and rated current; A charging device information module, used to obtain charging device information of the charging device at multiple times in the detection cycle, wherein the charging device information includes: output voltage and output current; A charging device safety module, used to determine a charging device safety detection score at the jth moment of a detection cycle according to the charging device information and the battery pack information; A charging environment information module, used to obtain charging environment information of the charging environment at multiple moments in the detection cycle, wherein the charging environment information includes: temperature data, humidity data, wind data and light data; A charging environment safety module, used to determine a charging environment safety detection score at the jth moment in a detection period according to the charging environment information; The battery pack data module is used to obtain the battery temperature data and battery power data of the battery pack when it is being charged at multiple times during the detection cycle; A battery pack status safety module, used to determine a battery pack status safety detection score at the jth moment of a detection cycle according to the battery temperature data, the battery power data and the output current; The detection report module is used to generate a detection report at the jth moment in the detection cycle based on the charging equipment safety detection score, the charging environment safety detection score and the battery pack status safety detection score at the jth moment in the detection cycle.

6. A battery pack charging safety detection device, comprising: processor; A memory for storing processor-executable instructions; wherein the processor is configured to call the instructions stored in the memory to execute the method according to any one of claims 1 to 5.

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