Air duct blocking early warning method, device and equipment for air-cooled battery pack

Abstract

The embodiment of the invention provides an air duct blocking early warning method, device and equipment for an air-cooled battery pack, and relates to the technical field of temperature signal processing, and the method comprises the steps: obtaining the current temperature of an air duct through a first temperature sensor in the air duct; according to the working state and the environment state of the battery pack, the predicted temperature under the set air duct condition is obtained; judging the state of the air duct based on the temperature difference between the current temperature and the predicted temperature; if the temperature difference reaches a first set alarm threshold, the state of the air duct is judged to be a first alarm state, and a first early warning signal is sent out; if the temperature difference reaches a second set alarm threshold, the state of the air duct is judged to be a second alarm state, and a second early warning signal is sent out; the heat dissipation state of the air duct is automatically judged, early warning is given, automatic detection and alarm are achieved, good operation of equipment is guaranteed, and the heat dissipation efficiency and the heat dissipation effect are improved.

Description

Technical Field

[0001] The present application relates to the technical field of temperature signal processing, and in particular to an air duct blockage warning method, device and equipment for an air-cooled battery pack. Background Art

[0002] Battery Pack refers to the general term for combining multiple battery cells in series and parallel, and packaging, encapsulation and assembly according to the shape required by the customer. In order to achieve a higher volume energy density, the battery pack needs to have a very compact structural design. This design will greatly compress the space reserved for the air duct. When too much dust and debris accumulate on the air inlet filter of the air duct and the heat dissipation surface of the battery cell, it will lead to: the heat dissipation efficiency decreases, causing the cooling fan to consume more energy; and the heat dissipation effect is reduced, causing the battery cell to overheat, which in turn causes the performance of the battery cell to decline and even safety risks. It can only rely on manual regular inspection and cleaning. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a method, device and equipment for early warning of air duct blockage for air-cooled battery packs, so as to solve the problem of dust accumulation in existing air ducts leading to reduced heat dissipation efficiency and low heat dissipation effect.

[0004] In a first aspect, an embodiment of the present application provides an air duct blockage warning method for an air-cooled battery pack, which is applied to an air-cooled battery pack, wherein the air-cooled battery pack includes a plurality of battery cells, an air duct and a cooling fan; the method includes: Acquiring the current temperature of the air duct through a first temperature sensor in the air duct; According to the working status and environmental status of the battery pack, the predicted temperature under the set air duct conditions is obtained; Determine the status of the air duct based on the temperature difference between the current temperature and the predicted temperature; If the temperature difference reaches the first set alarm threshold, the state of the air duct is judged to be the first alarm state, and a first warning signal is issued; If the temperature difference reaches the second set alarm threshold, the state of the air duct is determined to be the second alarm state, and a second early warning signal is issued.

[0005] In the above implementation process, the current temperature of the air duct is obtained through the first temperature sensor in the air duct; the predicted temperature under the set air duct conditions is obtained according to the working state of the battery pack and the environmental state; the state of the air duct is judged based on the temperature difference between the current temperature and the predicted temperature; if the temperature difference reaches the first set alarm threshold, the state of the air duct is judged to be the first alarm state, and a first warning signal is issued; if the temperature difference reaches the second set alarm threshold, the state of the air duct is judged to be the second alarm state, and a second warning signal is issued; the heat dissipation state of the air duct is automatically judged and a warning is issued, thereby realizing automatic detection and alarm, ensuring the smooth operation of the equipment, and improving the heat dissipation efficiency and effect.

[0006] Furthermore, obtaining the predicted temperature under set air duct conditions according to the working state and environmental state of the battery pack includes: Obtaining the initial temperature of the battery cell through a second temperature sensor on the battery cell; Obtaining the battery cell parameters of the battery cell, wherein the battery cell parameters include: battery cell charge and discharge power; Get thermal resistance, fan speed and wind speed heat dissipation rate; According to the working status of the battery pack and the environmental status, calculate the predicted temperature when the air duct is in a normal state: ; in, Indicates the initial temperature of the battery cell; P indicates the charging and discharging power of the battery cell; represents the time scale of the prediction; represents thermal resistance; S represents fan speed; Indicates the wind speed heat dissipation rate.

[0007] In the above implementation process, the predicted temperature of the air duct is obtained, so that the heat dissipation state of the air duct can be judged according to the current temperature and the predicted temperature for control.

[0008] Furthermore, the obtaining of thermal resistance, fan speed and wind speed heat dissipation rate includes: The thermal resistance, which represents the temperature rise per unit power consumption, is determined by setting the device; Get the fan speed through the battery management system; The wind speed heat dissipation rate is measured, which is related to the thermal conductivity coefficient of the battery cell itself and the contact area between the battery cell and the air duct.

[0009] Further, the measuring of thermal resistance by setting the device includes: In a device where the air duct is in normal condition, set the fan speed to 0 and the formula changes to: ; The value of thermal resistance is determined by testing data from multiple working conditions.

[0010] In the above implementation process, when the fan speed is set to 0, there are only two unknowns in the formula for predicting temperature: thermal resistance and predicted temperature. By testing data from multiple working conditions and generating a set of equations, the value of thermal resistance is determined.

[0011] Further, the determination of the wind speed heat dissipation rate includes: By testing data from multiple working conditions and based on the formula for predicting temperature, the wind speed heat dissipation rate is determined.

[0012] In the above implementation process, the value of thermal resistance is determined, and according to the formula for predicting temperature, multiple working conditions are tested to obtain a set of equations, and the wind speed heat dissipation rate is calculated.

[0013] Furthermore, if the temperature difference reaches a first set alarm threshold, determining that the state of the air duct is a first alarm state and issuing a first warning signal includes: If the temperature difference reaches a first set alarm threshold, it is determined that the efficiency of the air duct is reduced, the state of the air duct is determined to be a first alarm state, and a first early warning signal is issued.

[0014] In the above implementation process, when the temperature difference exceeds this threshold, the heat dissipation efficiency decreases, causing the fan to consume more energy to maintain the battery cell temperature, affecting the efficiency of the entire machine. Therefore, the first warning is issued to remind the staff to clean the air duct.

[0015] Furthermore, if the temperature difference reaches a second set alarm threshold, determining that the state of the air duct is a second alarm state and issuing a second warning signal includes: Set the thermal design margin of the battery pack as the second alarm threshold; The second formula for setting the alarm threshold is: ; in, The maximum operating temperature that the battery cell can withstand; The temperature at which the battery pack operates normally at maximum power when the air duct is in normal condition; If the temperature difference reaches the second set alarm threshold, it is determined that the air duct cannot work normally, the state of the air duct is determined to be the second alarm state, and a second early warning signal is issued.

[0016] In the above implementation process, when the temperature difference exceeds this threshold, the system issues a serious alarm, and thus a second warning is issued to inform the administrator that the cleaning work must be completed as soon as possible.

[0017] In a second aspect, an embodiment of the present application further provides an air duct blockage warning device for an air-cooled battery pack, which is integrated in the air-cooled battery pack, wherein the air-cooled battery pack includes a plurality of battery cells, an air duct and a cooling fan; the device includes: A temperature acquisition module, used to acquire the current temperature of the air duct through a first temperature sensor in the air duct; A temperature prediction module is used to obtain the predicted temperature under set air duct conditions according to the working state of the battery pack and the environmental state; The air duct judgment module is used to judge the state of the air duct based on the temperature difference between the current temperature and the predicted temperature; A first warning module, configured to determine that the state of the air duct is a first warning state and issue a first warning signal if the temperature difference reaches a first set warning threshold; The second warning module is used to determine that the state of the air duct is a second warning state and issue a second warning signal if the temperature difference reaches a second set alarm threshold.

[0018] In a third aspect, an embodiment of the present application provides an electronic device, including: A processor, a memory and a bus, wherein the processor is connected to the memory via the bus, and the memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, they are used to implement the air duct blockage warning method for an air-cooled battery pack as described above.

[0019] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a server, implements the air duct blockage warning method for an air-cooled battery pack as described above.

[0020] In a fifth aspect, an embodiment of the present invention provides a computer program product, which includes instructions, and when the instructions are executed by a computer, the computer implements the air duct blockage warning method for an air-cooled battery pack as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A flow chart of a method for early warning of air duct blockage for an air-cooled battery pack provided in an embodiment of the present application; Figure 2 A schematic diagram of a flow chart of an air duct blockage warning device for an air-cooled battery pack provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of an air-cooled battery pack provided in an embodiment of the present application for an air duct blockage warning device for an air-cooled battery pack; Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0024] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] Please see Figure 1 , Figure 1 A flow chart of a method for early warning of air duct blockage for an air-cooled battery pack provided in an embodiment of the present application. The method for early warning of air duct blockage for an air-cooled battery pack is applied to an air-cooled battery pack, the air-cooled battery pack comprising a plurality of battery cells, an air duct and a cooling fan; the method comprises: 100. Obtain the current temperature of the air duct through a first temperature sensor in the air duct.

[0026] Optionally, the first temperature sensor is installed on the inside of the air duct to ensure that the measured temperature can reflect the temperature conditions of the entire air duct or key areas; avoid installing the first temperature sensor in airflow dead corners or areas directly affected by external heat sources to avoid affecting measurement accuracy.

[0027] Optionally, the collected temperature data is filtered to remove noise and interference, and the processed temperature data is converted into an actual temperature value. The temperature data output by the temperature sensor is read in real time through a control unit such as a microcontroller or a PLC.

[0028] 200. Obtain predicted temperature under set air duct conditions according to the working state and environmental state of the battery pack.

[0029] It can be understood that the air duct condition is set to the condition that the air duct is in a normal state (under good air duct conditions), combined with the working state parameters of the battery pack and the environmental state parameters of the air-cooled battery pack, to obtain the predicted temperature of the air duct at this time, so that when the air duct state is abnormal, the abnormal state of the air duct can be discovered based on the temperature.

[0030] 300. Determine the state of the air duct based on the temperature difference between the current temperature and the predicted temperature.

[0031] For example, to judge the health of the air duct, a parameter F is defined: ; Among them, the meaning of F is the deviation between the current actual temperature and the predicted temperature. When its value is too large, it means that the air duct may be blocked.

[0032] 400. If the temperature difference reaches a first set alarm threshold, determine that the state of the air duct is a first alarm state, and send a first warning signal.

[0033] Specifically, an alarm threshold is set, wherein the first alarm threshold is a general alarm threshold. When the temperature difference reaches the first alarm threshold, the heat dissipation efficiency decreases, which causes the fan to consume more energy to maintain the battery core temperature, affecting the efficiency of the entire machine. It is understandable that the specific value of the first alarm threshold is set according to specific needs, and the embodiment of the present application does not limit the specific value.

[0034] 500. If the temperature difference reaches a second set alarm threshold, the state of the air duct is determined to be a second alarm state, and a second warning signal is issued.

[0035] Specifically, an alarm threshold is set, wherein the second alarm threshold is a severe alarm threshold. When the temperature difference reaches the second alarm threshold, the system issues a severe alarm to remind the administrator to complete the cleaning work as soon as possible. It is understandable that the specific value of the second alarm threshold is set according to specific needs, and the embodiment of the present application does not limit the specific value.

[0036] As described above, the embodiment of the present application obtains the current temperature of the air duct through the first temperature sensor in the air duct; obtains the predicted temperature under the set air duct conditions according to the working state and environmental state of the battery pack; judges the state of the air duct based on the temperature difference between the current temperature and the predicted temperature; if the temperature difference reaches the first set alarm threshold, judges the state of the air duct as the first alarm state, and issues a first warning signal; if the temperature difference reaches the second set alarm threshold, judges the state of the air duct as the second alarm state, and issues a second warning signal; automatically judges the heat dissipation state of the air duct and issues a warning, realizes automatic detection and alarm, ensures the smooth operation of the equipment, and improves the heat dissipation efficiency and heat dissipation effect.

[0037] On the basis of the above-mentioned embodiment, the air duct blockage warning method for an air-cooled battery pack in the embodiment of the present application can also be embodied as follows: the predicted temperature under the set air duct condition is obtained according to the working state and environmental state of the battery pack, including: 210. Obtain an initial temperature of the battery cell through a second temperature sensor on the battery cell.

[0038] Optionally, the second temperature sensor can be installed on the surface of the battery cell, the contact surface between the battery cell and the module, or the heat-sensitive area inside the battery cell. At the same time, the temperature sensor is usually fixed on the protective plate of the battery cell in the form of a patch to ensure close contact with the battery cell and reduce the thermal resistance of temperature transfer.

[0039] Exemplarily, the temperature sensor converts the temperature of the battery cell into an electrical signal (such as voltage or resistance value) and transmits it to the control unit of the BMS through the circuit. The control unit of the BMS samples and converts the temperature signal through a dedicated IC chip to obtain the initial temperature value of the battery cell; the control unit of the BMS processes the collected temperature data, including filtering, calibration, and compensation steps, to improve the temperature measurement accuracy.

[0040] 220. Obtain cell parameters of the cell, where the cell parameters include: cell charge and discharge power.

[0041] It should be noted that the charge and discharge power of the battery cell is one of the important parameters of the battery cell performance, which reflects the electric energy that can be charged or discharged by the battery cell in a unit time. Among them, the charge and discharge power of the battery cell is calculated or tested through other parameters of the battery cell (such as capacity, voltage, internal resistance, etc.) and actual use conditions (such as temperature, discharge rate, etc.); it can be understood that there are many existing means of implementing the test method of the charge and discharge power of the battery cell, and the embodiments of this application do not specifically limit this.

[0042] 230. Get thermal resistance, fan speed and wind speed heat dissipation rate.

[0043] It should be noted that thermal resistance is the resistance encountered by heat during conduction, which is used to describe the degree of obstruction of heat flow by an object; fan speed refers to the number of times the fan blades rotate per minute, which directly affects the fan's heat dissipation capacity and noise level; wind speed heat dissipation rate refers to the heat carried away by the airflow generated by the fan per unit time, which reflects the fan's heat dissipation capacity.

[0044] 240. According to the working status of the battery pack and the environmental status, calculate the predicted temperature when the air duct is in normal state: ; in, Indicates the initial temperature of the battery cell; P indicates the charging and discharging power of the battery cell; represents the time scale of the prediction; represents thermal resistance; S represents fan speed; Indicates the wind speed heat dissipation rate.

[0045] Thus, the predicted temperature of the air duct is obtained, so that the heat dissipation state of the air duct can be judged according to the current temperature and the predicted temperature for control.

[0046] On the basis of the above-mentioned embodiment, the air duct blockage warning method for an air-cooled battery pack in the embodiment of the present application can also be embodied as follows: the obtaining of thermal resistance, fan speed and wind speed heat dissipation rate includes: 231. The thermal resistance is measured by setting the device, which represents the temperature rise value caused by unit power consumption.

[0047] For example, the measured thermal resistance can be obtained by direct measurement or simulation; wherein, the direct measurement method: using professional thermal resistance measuring instruments, such as hot wire anemometers, hot film anemometers, etc., to calculate the thermal resistance by measuring the temperature change during the heat flow process. The simulation method: using simulation software to simulate the heat dissipation process of an object, by setting boundary conditions and parameters, the thermal resistance of the object can be calculated.

[0048] 232. Get the fan speed through the battery management system.

[0049] Exemplarily, the fan speed can be measured by direct observation or software monitoring. The direct observation method is to observe the rotation speed of the fan blades with the naked eye, or to use a speed measuring instrument (such as a tachometer) to directly measure the fan speed. The software monitoring method is to use professional hardware monitoring software to monitor the computer fan speed information in real time and send it to the battery management system.

[0050] 233. Measure the wind speed heat dissipation rate, which is related to the thermal conductivity coefficient of the battery cell itself and the contact area between the battery cell and the air duct.

[0051] Exemplarily, the wind speed heat dissipation rate can be obtained by direct measurement or empirical formula method; wherein, direct measurement method: use wind speed measuring instrument (such as hot wire anemometer, laser Doppler anemometer, etc.) to measure the air flow velocity generated by the fan, and combine parameters such as thermal resistance and heat dissipation area of ​​the object to calculate the wind speed heat dissipation rate; empirical formula method: use empirical formula to estimate the wind speed heat dissipation rate based on parameters such as fan speed, blade design, airflow channel, etc.

[0052] On the basis of the above-mentioned embodiment, the air duct blockage warning method for an air-cooled battery pack in the embodiment of the present application can also be embodied as follows: the step of measuring the thermal resistance by setting a device includes: In a device where the air duct is in normal condition, set the fan speed to 0 and the formula changes to: ; The value of thermal resistance is determined by testing data from multiple working conditions.

[0053] It is understandable that when the fan speed is set to 0, there are only two unknowns in the formula for predicting temperature: thermal resistance and predicted temperature. By testing data from multiple working conditions and generating a set of equations, the value of thermal resistance can be determined.

[0054] Based on the above embodiments, the air duct blockage warning method for an air-cooled battery pack of the embodiment of the present application can also be concretized as follows: the determination of the wind speed heat dissipation rate includes: determining the wind speed heat dissipation rate based on a formula for predicting temperature by testing data from multiple working conditions.

[0055] It can be understood that the value of thermal resistance is determined according to the formula for predicting temperature. The formula for predicting temperature only has two unknowns: thermal resistance and wind speed heat dissipation rate. By testing multiple working conditions, a set of equations is obtained, and the wind speed heat dissipation rate is calculated.

[0056] On the basis of the above embodiment, the air duct blockage warning method for an air-cooled battery pack in the embodiment of the present application can also be embodied as follows: if the temperature difference reaches a first set alarm threshold, the state of the air duct is judged to be a first alarm state, and a first alarm signal is issued, including: If the temperature difference reaches a first set alarm threshold, it is determined that the efficiency of the air duct is reduced, the state of the air duct is determined to be a first alarm state, and a first early warning signal is issued.

[0057] It is understandable that when the temperature difference exceeds this threshold, the heat dissipation efficiency decreases, causing the fan to consume more energy to maintain the battery cell temperature, affecting the efficiency of the entire machine. Therefore, the first warning is issued to remind the staff that the air duct needs to be cleaned.

[0058] On the basis of the above embodiment, the air duct blockage warning method for an air-cooled battery pack of the embodiment of the present application can also be embodied as follows: if the temperature difference reaches the second set alarm threshold, the state of the air duct is judged to be the second alarm state, and a second alarm signal is issued, including: Set the thermal design margin of the battery pack as the second alarm threshold; The second formula for setting the alarm threshold is: ; in, The maximum operating temperature that the battery cell can withstand; The temperature at which the battery pack operates normally at maximum power when the air duct is in normal condition; If the temperature difference reaches the second set alarm threshold, it is determined that the air duct cannot work normally, the state of the air duct is determined to be the second alarm state, and a second early warning signal is issued.

[0059] It is understandable that when the temperature difference exceeds this threshold, the system issues a serious alarm, and thus a second warning is issued to inform the administrator that the cleaning work must be completed as soon as possible.

[0060] The above steps are not to be performed in a strict order as described in the numbers, but should be understood as an overall solution.

[0061] In the second aspect, based on the above embodiments, the embodiments of the present application further provide an air duct blockage warning device for an air-cooled battery pack, referring to Figure 2 The air duct blockage warning device for the air-cooled battery pack provided in this embodiment is integrated in the air-cooled battery pack. Please refer to Figure 3 The air-cooled battery pack includes a plurality of battery cells, an air duct and a cooling fan; the device specifically includes: a temperature acquisition module 201, a temperature prediction module 202, an air duct judgment module 203, a first warning module 204 and a second warning module 205.

[0062] Among them, the temperature acquisition module 201 is used to obtain the current temperature of the air duct through the first temperature sensor in the air duct; the temperature prediction module 202 is used to obtain the predicted temperature under the set air duct conditions according to the working state and environmental state of the battery pack; the air duct judgment module 203 is used to judge the state of the air duct based on the temperature difference between the current temperature and the predicted temperature; the first early warning module 204 is used to judge the state of the air duct as the first alarm state if the temperature difference reaches the first set alarm threshold, and issue a first early warning signal; the second early warning module 205 is used to judge the state of the air duct as the second alarm state if the temperature difference reaches the second set alarm threshold, and issue a second early warning signal.

[0063] in, Figure 3 The structure of the air-cooled battery pack is shown. The battery cell is also provided with a power terminal. The arrow indicates that the air enters the air duct from the air inlet to absorb heat, and then the hot air is discharged through the cooling fan to complete the heat dissipation.

[0064] As described above, the embodiment of the present application obtains the current temperature of the air duct through the first temperature sensor in the air duct; obtains the predicted temperature under the set air duct conditions according to the working state and environmental state of the battery pack; judges the state of the air duct based on the temperature difference between the current temperature and the predicted temperature; if the temperature difference reaches the first set alarm threshold, judges the state of the air duct as the first alarm state, and issues a first warning signal; if the temperature difference reaches the second set alarm threshold, judges the state of the air duct as the second alarm state, and issues a second warning signal; automatically judges the heat dissipation state of the air duct and issues a warning, realizes automatic detection and alarm, ensures the smooth operation of the equipment, and improves the heat dissipation efficiency and heat dissipation effect.

[0065] In a third aspect, an embodiment of the present application further provides an electronic device, which can integrate an air duct blockage warning device for an air-cooled battery pack with the user-mode polling mechanism provided in an embodiment of the present application. Figure 4 Schematic diagram of the structure of an electronic device provided by an embodiment of the present application. Figure 4 The electronic device includes: an input device 43, an output device 44, a memory 42 and one or more processors 41; the memory 42 is used to store one or more programs; when the one or more programs are executed by the one or more processors 41, the one or more processors 41 implement the air duct blockage warning method for air-cooled battery packs provided by the user-mode polling mechanism in the above embodiment. The input device 43, the output device 44, the memory 42 and the processor 41 can be connected by a bus or other means. Figure 4 The example of connecting through bus is taken in the following.

[0066] The processor 41 executes various functional applications and data processing of the device by running the software programs, instructions and modules stored in the memory 42, that is, implements the above-mentioned user-mode polling mechanism for the air duct blockage warning method for the air-cooled battery pack.

[0067] The electronic device provided above can be used to execute the air duct blockage warning method for an air-cooled battery pack of the user-mode polling mechanism provided in the above embodiment, and has corresponding functions and beneficial effects.

[0068] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium, which includes a stored computer program; wherein, when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the air duct blockage warning method for an air-cooled battery pack as described above, and can achieve the same beneficial effects.

[0069] Of course, the storage medium containing computer executable instructions provided in an embodiment of the present application is not limited to the air duct blockage warning method for an air-cooled battery pack as described above, and can also execute related operations in the air duct blockage warning method for an air-cooled battery pack provided in any embodiment of the present application.

[0070] In a fifth aspect, the embodiments of the present application also provide a computer program product, and the methods described in the various embodiments of the present application can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed on a computer, the processes or functions described in the various embodiments of the present application are executed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, a core network device, an OAM (Open Application Model) or other programmable device.

[0071] The computer program or instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions may be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disk; it may also be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both volatile and non-volatile types of storage media.

[0072] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0073] In addition, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0074] If the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0075] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0076] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0077] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A method for early warning of air duct blockage for an air-cooled battery pack, characterized in that: Applied to an air-cooled battery pack, the air-cooled battery pack includes a plurality of battery cells, an air duct and a cooling fan; the method includes: Acquiring the current temperature of the air duct through a first temperature sensor in the air duct; According to the working status and environmental status of the battery pack, the predicted temperature under the set air duct conditions is obtained; Determine the status of the air duct based on the temperature difference between the current temperature and the predicted temperature; If the temperature difference reaches the first set alarm threshold, the state of the air duct is judged to be the first alarm state, and a first warning signal is issued; If the temperature difference reaches the second set alarm threshold, the state of the air duct is determined to be the second alarm state, and a second early warning signal is issued.

2. The air duct blockage warning method for an air-cooled battery pack according to claim 1, characterized in that: The step of obtaining the predicted temperature under set air duct conditions according to the working state of the battery pack and the environmental state includes: Obtaining the initial temperature of the battery cell through a second temperature sensor on the battery cell; Obtaining the battery cell parameters of the battery cell, wherein the battery cell parameters include: battery cell charge and discharge power; Get thermal resistance, fan speed and wind speed heat dissipation rate; According to the working status of the battery pack and the environmental status, calculate the predicted temperature when the air duct is in a normal state: ； in, Indicates the initial temperature of the battery cell; P indicates the charging and discharging power of the battery cell; represents the time scale of the prediction; represents thermal resistance; S represents fan speed; Indicates the wind speed heat dissipation rate.

3. The air duct blockage warning method for an air-cooled battery pack according to claim 2, characterized in that: The obtaining of thermal resistance, fan speed and wind speed heat dissipation rate includes: The thermal resistance, which represents the temperature rise per unit power consumption, is determined by setting the device; Get the fan speed through the battery management system; The wind speed heat dissipation rate is measured, which is related to the thermal conductivity coefficient of the battery cell itself and the contact area between the battery cell and the air duct.

4. The air duct blockage warning method for an air-cooled battery pack according to claim 3, characterized in that: The step of determining thermal resistance by setting a device comprises: In a device where the air duct is in normal condition, the fan speed is set to 0, and the formula changes to: ； The value of thermal resistance is determined by testing data from multiple working conditions.

5. The air duct blockage warning method for an air-cooled battery pack according to claim 4, characterized in that: The method of measuring the wind speed heat dissipation rate comprises: By testing data from multiple working conditions and based on the formula for predicting temperature, the wind speed heat dissipation rate is determined.

6. The air duct blockage warning method for an air-cooled battery pack according to claim 1, characterized in that: If the temperature difference reaches the first set alarm threshold, determining that the state of the air duct is a first alarm state and issuing a first warning signal includes: If the temperature difference reaches a first set alarm threshold, it is determined that the efficiency of the air duct is reduced, the state of the air duct is determined to be a first alarm state, and a first early warning signal is issued.

7. The air duct blockage warning method for an air-cooled battery pack according to claim 1, characterized in that: If the temperature difference reaches the second set alarm threshold, determining that the state of the air duct is a second alarm state and issuing a second warning signal includes: Set the thermal design margin of the battery pack as the second alarm threshold; The second formula for setting the alarm threshold is: ； in, The maximum operating temperature that the battery cell can withstand; The temperature at which the battery pack operates normally at maximum power when the air duct is in normal condition; If the temperature difference reaches the second set alarm threshold, it is determined that the air duct cannot work normally, the state of the air duct is determined to be the second alarm state, and a second early warning signal is issued.

8. An air duct blockage warning device for an air-cooled battery pack, characterized in that: Integrated in an air-cooled battery pack, the air-cooled battery pack includes a number of battery cells, an air duct and a cooling fan; the device includes: A temperature acquisition module, used to acquire the current temperature of the air duct through a first temperature sensor in the air duct; A temperature prediction module is used to obtain the predicted temperature under set air duct conditions according to the working state of the battery pack and the environmental state; The air duct judgment module is used to judge the state of the air duct based on the temperature difference between the current temperature and the predicted temperature; A first warning module, configured to determine that the state of the air duct is a first warning state and issue a first warning signal if the temperature difference reaches a first set warning threshold; The second warning module is used to determine that the state of the air duct is a second warning state and issue a second warning signal if the temperature difference reaches a second set alarm threshold.

9. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the processor is connected to the memory via the bus, and the memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, they are used to implement the air duct blockage warning method for an air-cooled battery pack as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which, when executed by a server, implements the air duct blockage warning method for an air-cooled battery pack as described in any one of claims 1-7.

11. A computer program product, characterized in that The computer program product comprises instructions which, when executed by a computer, cause the computer to implement the method according to any one of claims 1-7.

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