Battery pack damage assessment method, device, vehicle, equipment and storage medium

Abstract

The present application relates to a battery pack damage assessment method, device, vehicle, equipment and storage medium. The method comprises: obtaining the measured temperature of the battery pack in the vehicle, the measured temperature of the coolant in the cooling system corresponding to the battery pack, the measured flow rate and the measured flow resistance; determining the standard flow resistance according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate; determining the damage assessment result of the battery pack according to the difference between the measured flow resistance and the standard flow resistance; wherein, determining the standard flow resistance according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate comprises: searching in the flow resistance map according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate to obtain the standard flow resistance. The use of this method can improve the accuracy and timeliness of battery pack damage assessment.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack damage assessment method, apparatus, vehicle, equipment and storage medium. Background Art

[0002] With the development of new energy technology, more and more electric vehicles are using batteries as driving force. Usually, the battery is installed at the bottom of the electric vehicle. After the electric vehicle is slightly hit, the damage of the battery pack is difficult to assess.

[0003] Currently, commonly used evaluation methods include detecting the voltage of the battery pack and determining the degree of damage based on the voltage change; or detecting the temperature of the battery pack and determining the degree of damage based on the temperature change.

[0004] However, when the battery pack is subjected to a slight impact, the voltage and temperature changes may be small; when the changes become larger, the battery pack is already in a relatively dangerous state. Therefore, the accuracy and timeliness of the above evaluation method are difficult to meet actual needs. Summary of the invention

[0005] Based on the above problems, the present application provides a battery pack damage assessment method, device, vehicle, equipment and storage medium, which can more comprehensively analyze the actual working conditions of the cooling system and the battery pack, so as to more accurately assess the damage of the battery pack after being hit to the bottom.

[0006] In a first aspect, the present application provides a battery pack damage assessment method, the method comprising: obtaining the measured temperature of a battery pack in a vehicle, the measured temperature of a coolant in a cooling system corresponding to the battery pack, the measured flow rate and the measured flow resistance; determining a standard flow resistance according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate; determining a damage assessment result of the battery pack according to the difference between the measured flow resistance and the standard flow resistance; wherein, determining the standard flow resistance according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate comprises: searching in a flow resistance map according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate to obtain the standard flow resistance; the flow resistance map is used to characterize the correspondence between the flow resistance of the coolant and the temperature of the battery pack, the temperature of the coolant and the flow rate.

[0007] In the technical solution of the embodiment of the present application, by obtaining multiple parameters such as the measured temperature of the battery pack, the measured temperature of the coolant in the cooling system, the measured flow rate and the measured flow resistance, the actual working conditions of the cooling system and the battery pack can be analyzed more comprehensively, and multi-parameter monitoring makes the evaluation process more accurate, thereby more accurately evaluating the damage of the battery pack. In addition, by continuously acquiring these measured data, real-time monitoring of the battery pack status can be achieved, and after determining that the battery pack is abnormal, it can respond immediately, thereby improving the safety of the battery pack and the vehicle. Further, by searching for a standard flow resistance that matches the current measured conditions in the flow resistance map, the battery pack management system can quickly obtain a reference value. This matching method can improve the accuracy of the damage assessment and make the assessment results more scientific and reliable. In addition, the flow resistance map not only takes into account the influence of a single factor, but also integrates the interaction between the battery pack temperature, the coolant temperature and the flow rate. Through this multi-dimensional analysis, the battery pack management system can more comprehensively evaluate the operating status of the cooling system and the battery pack, reducing the evaluation deviation caused by ignoring a certain factor, thereby making fault detection and diagnosis more comprehensive.

[0008] In some embodiments, the method further includes: obtaining and storing a flow resistance map; the flow resistance map is established according to multiple experimental temperatures of the battery pack, multiple experimental temperatures of the coolant, multiple experimental flow rates, and multiple experimental flow resistances after the temperature of the battery pack, the temperature of the coolant, and the flow rate are respectively used as variables for experiments. In the technical solution of the embodiment of the present application, by respectively using the battery pack temperature, the coolant temperature, and the flow rate as variables for experiments, the influence of multiple factors on the flow resistance can be comprehensively considered. This multivariate analysis enables the flow resistance map to fully reflect the changing law of the flow resistance under different working conditions, providing a multi-dimensional reference tool, which helps to more comprehensively evaluate the health status of the battery pack and reduce the evaluation deviation caused by ignoring a certain factor.

[0009] In some embodiments, the damage assessment result of the battery pack is determined based on the difference between the measured flow resistance and the standard flow resistance, including: calculating the flow resistance change between the measured flow resistance and the standard flow resistance; determining the damage assessment result of the battery pack based on the flow resistance change and a preset change threshold. In the technical solution of the embodiment of the present application, by setting a reasonable change threshold, the battery pack management system can effectively filter out irrelevant changes caused by normal operating fluctuations, reduce the possibility of false alarms, and thus reduce unnecessary maintenance or intervention due to misjudgment.

[0010] In some embodiments, the damage assessment result of the battery pack is determined based on the flow resistance change and a preset change threshold, including: when the flow resistance change is greater than the change threshold, determining that the damage assessment result of the battery pack is abnormal. In the technical solution of the embodiment of the present application, by comparing the flow resistance change with the change threshold, the battery pack management system can quickly identify abnormal conditions that exceed the normal working range.

[0011] In some embodiments, the process of determining the measured flow resistance includes: obtaining the water inlet pressure and the water outlet pressure of the battery pack cooling plate in the cooling system; and determining the difference between the water inlet pressure and the water outlet pressure as the measured flow resistance. In the technical solution of the embodiment of the present application, the battery pack management system can effectively monitor the flow resistance of the cooling system, thereby providing an important evaluation basis for the health status of the battery pack and the cooling system.

[0012] In some embodiments, the method further includes at least one of the following: limiting the output power of the battery pack according to the damage assessment result; outputting maintenance prompt information according to the damage assessment result. In the technical solution of the embodiment of the present application, the battery pack management system can take preventive actions when damage is detected to reduce the risk of further damage to the battery pack, and guide the user to perform timely maintenance and repair, thereby improving the safety of the vehicle.

[0013] In a second aspect, the present application also provides a battery pack damage assessment device, the device comprising:

[0014] A measured data acquisition module is used to obtain the measured temperature of the battery pack in the vehicle, the measured temperature of the coolant in the cooling system corresponding to the battery pack, the measured flow rate and the measured flow resistance;

[0015] A standard flow resistance determination module, used to determine the standard flow resistance according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate;

[0016] An evaluation result determination module, used to determine the damage evaluation result of the battery pack according to the difference between the measured flow resistance and the standard flow resistance;

[0017] Among them, the standard flow resistance determination module is used to search in the flow resistance map according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate to obtain the standard flow resistance; the flow resistance map is used to characterize the correspondence between the flow resistance of the coolant and the temperature of the battery pack, the temperature of the coolant and the flow rate.

[0018] In a third aspect, the present application further provides a vehicle, the vehicle comprising a battery pack, a cooling system, a plurality of sensors, and a battery pack management system;

[0019] A battery pack, used to provide driving force for the vehicle;

[0020] A cooling system for cooling the battery pack;

[0021] Sensors for testing the battery pack and cooling system;

[0022] A battery pack management system, used to determine a standard flow resistance based on the measured temperature of the battery pack, the measured temperature of the coolant, the measured flow rate and the measured flow resistance, and to determine a damage assessment result of the battery pack based on the difference between the measured flow resistance and the standard flow resistance;

[0023] The standard flow resistance is determined according to the measured temperature of the battery pack, the measured temperature of the coolant, and the measured flow rate, including:

[0024] The standard flow resistance is obtained by searching in the flow resistance map according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate; the flow resistance map is used to characterize the corresponding relationship between the flow resistance of the coolant and the temperature of the battery pack, the temperature of the coolant and the flow rate.

[0025] In a fourth aspect, the present application further provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements any one of the methods in the first aspect when executing the computer program.

[0026] In a fifth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method of any one of the first aspects is implemented.

[0027] In a sixth aspect, the present application further provides a computer program product, comprising a computer program, which implements any one of the methods in the first aspect when executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the optional embodiments below. The accompanying drawings are only used for the purpose of illustrating the optional embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0029] Figure 1 is a structural schematic diagram of a vehicle according to an embodiment of the present application;

[0030] Figure 2 is a flowchart of a battery pack damage assessment method according to an embodiment of the present application;

[0031] Figure 3 is a schematic diagram of flow resistance under different experimental flow rates according to an embodiment of the present application;

[0032] Figure 4 is a schematic diagram of flow resistance at different coolant temperatures according to an embodiment of the present application;

[0033] Figure 5 is a schematic diagram of flow resistance under different collision times according to an embodiment of the present application;

[0034] Figure 6 is a flow resistance map of an embodiment of the present application;

[0035] Figure 7 is a flowchart of the steps of determining the damage assessment result of a battery pack according to an embodiment of the present application;

[0036] Figure 8 is a schematic flow chart of a flow resistance determination step in one embodiment of the present application;

[0037] Fig. 9 is a structural block diagram of a battery pack damage assessment device according to an embodiment of the present application;

[0038] Fig.10 is a structural block diagram of a battery pack damage assessment device according to an embodiment of the present application;

[0039] Fig.11 is a structural block diagram of a battery pack damage assessment device according to another embodiment of the present application;

[0040] Fig.12 is a structural block diagram of a battery pack damage assessment device according to another embodiment of the present application;

[0041] Fig.13 is a structural schematic diagram of a vehicle according to an embodiment of the present application;

[0042] Fig.14 is a structural schematic diagram of a vehicle according to another embodiment of the present application;

[0043] Fig.15 It is a diagram of the internal structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0044] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0046] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0047] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0049] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] With the development of new energy technologies, electric vehicles have gradually become one of the mainstream choices in the market, and models that use batteries as the main driving force are particularly common. The batteries of such electric vehicles are usually installed at the bottom of the vehicle to optimize the center of gravity distribution and space utilization of the vehicle. However, this design also brings some potential risks. For example, during the driving process of the vehicle, the battery pack is easily damaged by uneven road surface or collision with obstacles.

[0052] As a core component of electric vehicles, the safety of the battery pack is directly related to the performance and service life of the entire vehicle. When an electric vehicle encounters a slight bottom bump during driving, the battery pack may be impacted and damaged to varying degrees. However, since the battery pack has a complex structure and is usually sealed in a solid shell, surface damage cannot always be accurately assessed through simple inspection. In this case, assessing the degree of damage to the battery pack is crucial to improving the safe use of the vehicle.

[0053] At present, there are two main methods for assessing battery pack damage commonly used in the industry: one is to detect the voltage change of the battery pack, and the other is to monitor the temperature change of the battery pack. These two methods determine whether the battery is damaged based on changes in the internal state of the battery. Specifically, the voltage change method is to continuously monitor the voltage values ​​of each module of the battery pack. If abnormal fluctuations in the voltage value are detected, it indicates that structural damage or connection problems have occurred inside the battery pack. The temperature change method is to monitor the surface or internal temperature of the battery pack through a temperature sensor. When the battery pack is impacted or damaged, chemical reactions or heat accumulation may occur inside, causing an abnormal increase in temperature.

[0054] However, the above two methods have certain limitations when dealing with battery pack damage caused by minor impacts. Minor mechanical shocks may not immediately lead to significant changes in voltage or temperature, especially when the impact force is distributed more evenly, and the internal changes of the battery pack may be difficult to capture by these traditional methods. At this time, relying on changes in voltage or temperature to assess damage may cause potential problems to be discovered late, and significant voltage fluctuations or temperature anomalies will not appear until the damage has intensified to a certain extent. However, when these changes are detected, the battery pack may already be in a relatively dangerous state, with safety hazards such as thermal runaway and short circuit. Therefore, the accuracy and real-time performance of traditional evaluation methods are difficult to fully meet the high safety requirements in the actual application of electric vehicles.

[0055] Research on the above-mentioned problem found that after the battery pack is impacted, the battery pack cooling plate at the bottom of the battery pack may be deformed. On the one hand, the deformation will affect the cooling efficiency, and on the other hand, it may squeeze the battery cells, causing internal short circuits in the battery cells. The battery pack has safety hazards after long-term use. Based on the above findings, the embodiment of the present application provides a battery pack damage assessment scheme, which obtains the measured temperature of the battery pack in the vehicle, the measured temperature of the coolant in the cooling system corresponding to the battery pack, the measured flow rate and the measured flow resistance; determines the standard flow resistance according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate; determines the damage assessment result of the battery pack according to the difference between the measured flow resistance and the standard flow resistance. In the technical scheme of the embodiment of the present application, by obtaining multiple parameters such as the measured temperature of the battery pack, the measured temperature of the coolant in the cooling system, the measured flow rate and the measured flow resistance, the actual working conditions of the cooling system and the battery pack can be analyzed more comprehensively, and multi-parameter monitoring makes the assessment process more precise, thereby more accurately assessing the damage of the battery pack.

[0056] The battery pack damage assessment method provided in the embodiment of the present application can be applied to refer to Figure 1 In the application environment shown, the vehicle includes a battery pack 101 , a cooling system 102 , a plurality of sensors 103 , and a battery pack management system 104 .

[0057] The battery pack 101 is the main driving force source of the vehicle and is responsible for providing the necessary electrical energy for the vehicle's electric motor. The cooling system 102 is used to adjust the temperature of the battery pack 101 and prevent the battery pack 101 from overheating by liquid cooling, so that it is kept within a safe temperature range under various working conditions.

[0058] The sensor 103 can transmit data to the battery pack management system 104 through the communication network. The battery pack management system 104 is responsible for receiving, processing and analyzing multiple measured data sent back by the sensor 103, and based on these multi-dimensional measured data, comprehensively evaluates the health status of the battery pack 101 and determines its damage.

[0059] According to some embodiments of the present application, referring to Figure 2 , a battery pack damage assessment method is provided, which can be applied to Figure 1 The battery pack management system in the example is used to illustrate, which may include the following steps:

[0060] Step 201, obtaining the measured temperature of the battery pack in the vehicle, the measured temperature of the coolant in the cooling system corresponding to the battery pack, the measured flow rate and the measured flow resistance.

[0061] The measured temperature of the battery pack may be measured by a first temperature sensor disposed at the battery pack. The first temperature sensor senses the temperature change of the battery pack and collects real-time temperature data of the battery pack.

[0062] The measured temperature of the coolant can be measured by a second temperature sensor set at any position in the battery pack cooling plate. The second temperature sensor senses the temperature of the coolant in the cooling plate and collects the current temperature data of the coolant. The measured temperature of the coolant reflects the heat exchange capacity of the cooling system. If the coolant temperature is too high, it may mean that the cooling efficiency is low and the heat cannot be effectively dissipated, which increases the temperature and damage risk of the battery pack.

[0063] The measured flow rate of the coolant can be measured by a flow sensor installed at any position in the battery pack cooling plate. The flow sensor detects the speed of the coolant flow and collects real-time flow rate data of the coolant. The measured flow rate determines the circulation efficiency of the coolant in and out of the battery pack. A lower flow rate may indicate that the cooling system is blocked or the pump efficiency is reduced, affecting the cooling effect; while an excessively high flow rate may indicate that there is a leak in the cooling system or the pump power is too large.

[0064] The measured flow resistance of the coolant can be determined during the flow of the coolant based on real-time pressure data measured by a first pressure sensor disposed in the water inlet of the battery pack cooling plate and a second pressure sensor disposed at the water outlet. The measured flow resistance is closely related to the flow rate of the coolant and the design and connection of the pipelines in the cooling system. It should be noted that the measured flow resistance is an important parameter for evaluating the blockage in the cooling system, and can reflect the deformation of the battery pack cooling plate to a certain extent. Excessive flow resistance may mean that the cooling line is blocked and the flow of the coolant is restricted; too small flow resistance may indicate that there is a leak in the cooling system or that the pipeline is not completely connected, affecting the normal circulation of the coolant.

[0065] The first temperature sensor collects the actual temperature of the battery pack, the second temperature sensor collects the actual temperature of the coolant, the flow rate sensor collects the actual flow rate, and the first pressure sensor and the second pressure sensor collect real-time pressure data, which are all sent to the battery pack management system. The battery pack management system obtains the actual temperature of the battery pack, the actual temperature of the coolant in the cooling system, and the actual flow rate, and calculates the actual flow resistance based on the collected real-time pressure data.

[0066] Step 202 , determining a standard flow resistance according to the measured temperature of the battery pack, the measured temperature of the coolant, and the measured flow rate.

[0067] Among them, the standard flow resistance reflects the normal flow resistance state that should be exhibited under the current temperature of the battery pack, the current temperature of the coolant and the current flow rate.

[0068] The battery pack management system normalizes the measured temperature of the battery pack, the measured temperature of the coolant, and the measured flow rate to obtain processed data to match the input requirements of the deep learning model. Then, the processed data is input into the pre-trained deep learning model. The deep learning model uses a multi-layer neural network architecture to analyze and calculate the input measured temperature of the battery pack, the measured temperature of the coolant, and the measured flow rate layer by layer, and finally outputs the standard flow resistance.

[0069] In some embodiments, determining the standard flow resistance based on the measured temperature of the battery pack, the measured temperature of the coolant, and the measured flow rate may include: searching in a flow resistance map based on the measured temperature of the battery pack, the measured temperature of the coolant, and the measured flow rate to obtain the standard flow resistance.

[0070] The flow resistance map is used to characterize the corresponding relationship between the flow resistance of the coolant and the temperature of the battery pack, the temperature of the coolant, and the flow rate. The flow resistance map covers the standard flow resistance under different temperature and flow rate conditions. The standard flow resistance reflects the normal flow resistance state that the cooling system should exhibit under the current temperature of the battery pack, the current temperature of the coolant, and the current flow rate.

[0071] The battery pack management system searches for the corresponding standard flow resistance in a pre-established and stored flow resistance map according to the measured temperature of the battery pack, the measured temperature of the coolant, and the measured flow rate.

[0072] Understandably, by searching the flow resistance map for a standard flow resistance that matches the current measured conditions, the battery pack management system can quickly obtain a baseline value. This matching method can improve the accuracy of damage assessment and make the assessment results more scientific and reliable. In addition, the flow resistance map not only considers the impact of a single factor, but also integrates the interaction of battery pack temperature, coolant temperature and flow rate. Through this multi-dimensional analysis, the battery pack management system can more comprehensively evaluate the operating status of the cooling system and battery pack, reducing the evaluation deviation caused by ignoring a certain factor, thereby making fault detection and diagnosis more comprehensive.

[0073] Step 203: Determine the damage assessment result of the battery pack according to the difference between the measured flow resistance and the standard flow resistance.

[0074] The battery pack management system determines the damage assessment result of the battery pack by analyzing the difference between the measured flow resistance and the standard flow resistance. When the battery pack management system detects a difference between the two, it determines whether the difference exceeds the preset normal range to determine whether there is an abnormality in the battery pack. If the difference is within the normal range, the damage assessment result is determined to be "no abnormality"; if the difference exceeds the normal range, the damage assessment result is determined to be "abnormal".

[0075] Furthermore, the battery pack management system can determine multiple damage assessment levels based on the size of the difference. For example, a small difference may be assessed as a "slight abnormality", indicating that attention is needed but no immediate action is required; a medium difference may be assessed as a "moderate abnormality", suggesting further inspection and maintenance; and a large difference may be assessed as a "serious abnormality", requiring the battery pack to be stopped immediately and a detailed inspection to be carried out.

[0076] In the above embodiment, the measured temperature of the battery pack, the measured temperature of the coolant in the cooling system, the measured flow rate, and the measured flow resistance are obtained; the standard flow resistance is determined based on the measured temperature of the battery pack, the measured temperature of the coolant, and the measured flow rate; and the damage assessment result of the battery pack is determined based on the difference between the measured flow resistance and the standard flow resistance. In the technical solution of the embodiment of the present application, by obtaining multiple parameters such as the measured temperature of the battery pack, the measured temperature of the coolant in the cooling system, the measured flow rate, and the measured flow resistance, the actual working conditions of the cooling system and the battery pack can be more comprehensively analyzed, and multi-parameter monitoring makes the assessment process more precise, thereby more accurately assessing the damage of the battery pack.

[0077] According to some embodiments of the present application, the above embodiments may further include: acquiring and storing a flow resistance map; the flow resistance map is established according to multiple experimental temperatures of the battery pack, multiple experimental temperatures of the coolant, multiple experimental flow rates, and multiple experimental flow resistances after experiments are conducted with the temperature of the battery pack, the temperature and flow rate of the coolant as variable quantities, respectively.

[0078] First, we conduct experiments by changing the temperature of the battery pack, the temperature of the coolant, and the flow rate. These experiments will generate a series of flow resistance data under different conditions.

[0079] During the experiment, the battery pack temperature, coolant temperature, flow rate and corresponding flow resistance of each group of experiments were recorded. These data reflect the changes in coolant flow resistance under various experimental conditions.

[0080] The collected experimental data is input into the data analysis system, and the flow resistance map is generated through data processing and modeling. The battery pack management system can obtain and store the flow resistance map in advance. During the operation of the battery pack management system, the battery pack management system uses the flow resistance map to find the standard flow resistance value that matches the current battery pack temperature, coolant temperature and flow rate.

[0081] In some embodiments, reference Figure 3 As shown, Figure 3 Schematic diagram of flow resistance at different experimental flow rates. Figure 3In the figure, the horizontal axis represents time in minutes, and the vertical axis represents pressure in kPa. The top line in the figure represents the pressure change at the water inlet over time; the bottom line represents the pressure change at the water outlet over time; the middle line represents the pressure difference between the water inlet and the water outlet over time.

[0082] Reference Figure 4 As shown, Figure 4 Figure 2 is a schematic diagram of flow resistance at different coolant temperatures. Figure 4 In the figure, the horizontal axis represents time in minutes, and the vertical axis represents pressure in kPa. The top line in the figure represents the pressure change at the water inlet over time; the bottom line represents the pressure change at the water outlet over time; the middle line represents the pressure difference between the water inlet and the water outlet over time.

[0083] Reference Figure 5 As shown, Figure 5 Schematic diagram of flow resistance under different collision numbers. Figure 5 In the figure, the horizontal axis represents the number of collisions, in times; the vertical axis represents the pressure, in kPa. The top broken line in the figure represents the pressure at the water inlet changes with the number of collisions; the bottom broken line represents the pressure at the water outlet changes with the number of collisions; the middle broken line represents the pressure difference between the water inlet and the water outlet changes with the number of collisions. It should be noted that, under normal circumstances, with the increase in the number of collisions, certain damage or deformation may occur inside the cooling system, which will cause the flow rate of the coolant to change, thereby affecting the pressure difference between the water inlet and the water outlet. Specifically, if the collision causes the channel to narrow or become blocked, the flow rate of the coolant will decrease, resulting in an increase in flow resistance, and the pressure difference between the water inlet and the water outlet will also increase. Conversely, if the structure in the cooling system is damaged, resulting in an increase in the flow rate of the coolant, the pressure difference will decrease accordingly.

[0084] Reference Figure 6 , Figure 6 is the flow resistance map, Figure 6 In the figure, the X-axis represents the temperature of the coolant, the Y-axis represents the temperature of the battery pack, and the Z-axis represents the flow rate.

[0085] In the above embodiment, a flow resistance spectrum is obtained and stored; the flow resistance spectrum is established according to multiple experimental temperatures of the battery pack, multiple experimental temperatures of the coolant, multiple experimental flow rates, and multiple experimental flow resistances after the temperature of the battery pack, the temperature of the coolant, and the flow rate are respectively used as variables for experiments. In the technical solution of the embodiment of the present application, by respectively using the battery pack temperature, the coolant temperature, and the flow rate as variables for experiments, the influence of various factors on the flow resistance can be comprehensively considered. This multivariate analysis enables the flow resistance spectrum to fully reflect the changing law of the flow resistance under different working conditions, and provides a multi-dimensional reference tool, which helps to more comprehensively evaluate the health status of the battery pack and reduce the evaluation deviation caused by ignoring a certain factor.

[0086] According to some embodiments of the present application, referring to Figure 7 In the above embodiment, “determining the damage assessment result of the battery pack according to the difference between the measured flow resistance and the standard flow resistance” may include the following steps:

[0087] Step 301, calculating the flow resistance change between the measured flow resistance and the standard flow resistance.

[0088] The battery pack management system can determine the difference between the measured flow resistance and the standard flow resistance as the flow resistance change.

[0089] Step 302, determining a damage assessment result of the battery pack according to the flow resistance change and a preset change threshold.

[0090] The battery pack management system can set multiple preset flow resistance change thresholds (e.g., a slight abnormality threshold, a moderate abnormality threshold, a severe abnormality threshold), which are used to divide the flow resistance change into different evaluation levels.

[0091] If the change in flow resistance is higher than the slight abnormality threshold but lower than the moderate abnormality threshold, the battery pack management system assesses the damage to the battery pack as "slight abnormality", which may not immediately affect the safe operation of the vehicle.

[0092] If the change in flow resistance is higher than the moderate abnormality threshold but lower than the severe abnormality threshold, the battery pack management system assesses the damage to the battery pack as "moderate abnormality".

[0093] If the change in flow resistance is higher than the severe abnormality threshold, the battery pack management system assesses the damage to the battery pack as "severe abnormality". This assessment level indicates that there is a serious problem with the battery pack or cooling system and immediate measures need to be taken, such as deactivating the battery pack for maintenance.

[0094] In the above embodiment, the flow resistance change between the measured flow resistance and the standard flow resistance is calculated; the damage assessment result of the battery pack is determined based on the flow resistance change and the preset change threshold. In the technical solution of the embodiment of the present application, by setting a reasonable change threshold, the battery pack management system can effectively filter out irrelevant changes caused by normal operating fluctuations and reduce the possibility of false alarms, thereby reducing unnecessary maintenance or intervention due to misjudgment.

[0095] According to some embodiments of the present application, "determining a damage assessment result of the battery pack based on the change in flow resistance and a preset change threshold" in the above embodiments may include: when the change in flow resistance is greater than the change threshold, determining that the damage assessment result of the battery pack is abnormal.

[0096] The battery pack management system compares the calculated flow resistance change with the preset change threshold. If the flow resistance change is greater than the preset change threshold, the battery pack management system determines the battery pack damage as "battery pack abnormality", which means that the deviation of the measured flow resistance exceeds the normal range, which may indicate a problem with the cooling system, such as blockage, leakage or other failure.

[0097] In some embodiments, the change threshold may be set to 0.5 kPa, that is, when the flow resistance change exceeds 0.5 kPa, the damage assessment result of the battery pack is determined to be abnormal.

[0098] In the above embodiment, when the change in flow resistance is greater than the change threshold, the damage assessment result of the battery pack is determined to be abnormal. In the technical solution of the embodiment of the present application, by comparing the change in flow resistance with the change threshold, the battery pack management system can quickly identify abnormal conditions that exceed the normal working range.

[0099] According to some embodiments of the present application, referring to Figure 8 In the above embodiment, the process of determining the measured flow resistance may include the following steps:

[0100] Step 401, obtaining the water inlet pressure and the water outlet pressure of the battery pack cooling plate in the cooling system.

[0101] The first pressure sensor is installed at the water inlet of the battery pack cooling plate to measure the pressure of the coolant when it enters the cooling plate. The first pressure sensor captures and outputs the current water inlet pressure value, which is recorded as The second pressure sensor is installed at the outlet of the battery pack cooling plate to measure the pressure of the coolant flowing out after passing through the cooling plate. Similarly, the second pressure sensor captures and outputs the current outlet pressure value, recorded as The battery pack management system obtains pressure data from the first pressure sensor and the second pressure sensor.

[0102] Step 402: Determine the difference between the water inlet pressure and the water outlet pressure as the measured flow resistance.

[0103] The flow resistance reflects the resistance encountered by the coolant when passing through the battery pack cooling plate. The larger the difference, the greater the resistance of the coolant when flowing through the cooling plate, which may indicate a blockage or other abnormality in the cooling system.

[0104] The battery pack management system obtains the pressure data from the first pressure sensor and the second pressure sensor and calculates the difference between the two. The specific calculation formula can be expressed as follows:

[0105] (1)

[0106] Among them, ΔP is the pressure drop of the coolant when passing through the cooling plate, that is, the measured flow resistance.

[0107] In the above embodiment, the water inlet pressure and the water outlet pressure of the battery pack cooling plate in the cooling system are obtained; the difference between the water inlet pressure and the water outlet pressure is determined as the measured flow resistance. In the technical solution of the embodiment of the present application, the battery pack management system can effectively monitor the measured flow resistance of the cooling system, thereby providing an important evaluation basis for the health status of the battery pack and the cooling system.

[0108] According to some embodiments of the present application, the above method may further include at least one of the following steps: limiting the output power of the battery pack according to the damage assessment result; outputting maintenance prompt information according to the damage assessment result.

[0109] When the battery pack management system determines that the battery pack is abnormal based on the damage assessment results, the battery pack management system can automatically limit the output power of the battery pack. The degree of output power limitation can be adjusted according to the severity of the damage. For example, in the case of a minor abnormality, the battery pack management system will limit the power output to a% of the original output power, while in the case of a serious abnormality, the battery pack management system will significantly reduce the power output or completely stop the battery pack from supplying power.

[0110] When the battery pack management system determines that the battery pack is abnormal based on the damage assessment results, the battery pack management system will generate and output maintenance prompt information to remind users or maintenance personnel to pay attention to the abnormal state of the battery pack. The prompt information can be displayed on the vehicle display, instrument panel, or other human-machine interface devices, including a specific description of the abnormal situation, recommended maintenance measures, and safety precautions that need attention.

[0111] In the above embodiment, the output power of the battery pack is limited according to the damage assessment result; and the maintenance prompt information is output according to the damage assessment result. In the technical solution of the embodiment of the present application, the battery pack management system can take preventive actions when damage is detected to reduce the risk of further damage to the battery pack, and guide the user to perform timely maintenance and repair, thereby improving the safety of the vehicle.

[0112] According to some embodiments of the present application, a battery pack damage assessment method is provided, which is applied to Figure 1 The battery pack management system in the example is used to illustrate, which may include the following steps:

[0113] Step 1, obtain and store the flow resistance map; the flow resistance map is established according to multiple experimental temperatures of the battery pack, multiple experimental temperatures of the coolant, multiple experimental flow rates and multiple experimental flow resistances after experiments are conducted with the temperature of the battery pack, the temperature and flow rate of the coolant as variable quantities.

[0114] Step 2, obtaining the measured temperature of the battery pack, the measured temperature of the coolant in the cooling system, the measured flow rate and the measured flow resistance. The process of determining the measured flow resistance includes: obtaining the water inlet pressure and the water outlet pressure of the battery pack cooling plate in the cooling system; and determining the difference between the water inlet pressure and the water outlet pressure as the measured flow resistance.

[0115] Step 3, search in the flow resistance map according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate to obtain the standard flow resistance; the flow resistance map is used to characterize the correspondence between the flow resistance of the coolant and the temperature of the battery pack, the temperature of the coolant and the flow rate.

[0116] Step 4, calculating the flow resistance change between the measured flow resistance and the standard flow resistance.

[0117] Step 5: When the change in flow resistance is greater than the change threshold, determine that the damage assessment result of the battery pack is abnormal.

[0118] Step 6: limit the output power of the battery pack according to the damage assessment result; or output maintenance prompt information according to the damage assessment result.

[0119] In the above embodiment, the measured temperature of the battery pack, the measured temperature of the coolant in the cooling system, the measured flow rate and the measured flow resistance are obtained; the standard flow resistance is determined according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate; and the damage assessment result of the battery pack is determined according to the difference between the measured flow resistance and the standard flow resistance. In the technical solution of the embodiment of the present application, by obtaining multiple parameters such as the measured temperature of the battery pack, the measured temperature of the coolant in the cooling system, the measured flow rate and the measured flow resistance, the actual working conditions of the cooling system and the battery pack can be analyzed more comprehensively, and multi-parameter monitoring makes the assessment process more accurate, reducing the misjudgment that may be caused by a single parameter, thereby more accurately assessing the damage of the battery pack. In addition, by continuously acquiring these measured data, real-time monitoring of the battery pack status can be achieved. When an abnormal situation occurs, the battery pack management system can respond immediately, reducing delays, thereby improving the timeliness of the assessment.

[0120] It should be understood that, although the various steps in the above flowchart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the above flowchart may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0121] Based on the same inventive concept, the embodiment of the present application also provides a battery pack damage assessment device for implementing the battery pack damage assessment method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more battery pack damage assessment device embodiments provided below can refer to the limitations of the battery pack damage assessment method above, and will not be repeated here.

[0122] According to some embodiments of the present application, referring to Fig. 9 , provides a battery pack damage assessment device, the device comprising:

[0123] The measured data acquisition module 501 is used to obtain the measured temperature of the battery pack in the vehicle, the measured temperature of the coolant in the cooling system corresponding to the battery pack, the measured flow rate and the measured flow resistance;

[0124] A standard flow resistance determination module 502, configured to determine a standard flow resistance according to a measured temperature of the battery pack, a measured temperature of the coolant, and a measured flow rate;

[0125] An evaluation result determination module 503, used to determine a damage evaluation result of the battery pack according to a difference between the measured flow resistance and the standard flow resistance;

[0126] Among them, the standard flow resistance determination module 502 is specifically used to search in the flow resistance map according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate to obtain the standard flow resistance; the flow resistance map is used to characterize the correspondence between the flow resistance of the coolant and the temperature of the battery pack, the temperature of the coolant, and the flow rate.

[0127] In some embodiments, the evaluation result determination module 503 is specifically used to calculate the flow resistance change between the measured flow resistance and the standard flow resistance; and determine the damage evaluation result of the battery pack according to the flow resistance change and a preset change threshold.

[0128] In some embodiments, the assessment result determination module 503 is specifically used to determine that the damage assessment result of the battery pack is that the battery pack is abnormal when the change in flow resistance is greater than a change threshold.

[0129] In some embodiments, reference Fig.10 , the device further comprises:

[0130] The flow resistance map acquisition module 504 is used to acquire and store the flow resistance map; the flow resistance map is established based on multiple experimental temperatures of the battery pack, multiple experimental temperatures of the coolant, multiple experimental flow rates and multiple experimental flow resistances after experiments are conducted on the temperature of the battery pack, the temperature and flow rate of the coolant as variable quantities.

[0131] In some embodiments, reference Fig.11 , the device further comprises:

[0132] The pressure acquisition module 505 is used to obtain the water inlet pressure and the water outlet pressure of the battery pack cooling plate in the cooling system;

[0133] The flow resistance calculation module 506 is used to determine the difference between the water inlet pressure and the water outlet pressure as the flow resistance.

[0134] In some embodiments, reference Fig.12 , the device further comprises at least one of the following:

[0135] A power output limiting module 507 is used to limit the output power of the battery pack according to the damage assessment result;

[0136] The prompt information output module 508 is used to output maintenance prompt information according to the damage assessment result.

[0137] Each module in the above-mentioned battery pack damage assessment device can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in an electronic device in the form of hardware, or can be stored in a memory in an electronic device in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0138] According to some embodiments of the present application, a vehicle is provided. Figure 1 As shown, the vehicle includes a battery pack 101 , a cooling system 102 , a plurality of sensors 103 , and a battery pack management system 104 .

[0139] Specifically, the battery pack 101 is the main driving force source of the vehicle and is responsible for providing the necessary electrical energy for the vehicle's electric motor. The cooling system 102 is used to adjust the temperature of the battery pack 101, and prevents the battery pack 101 from overheating by liquid cooling, so that it is kept within a safe temperature range under various working conditions.

[0140] All sensors 103 transmit data to the battery pack management system 104 through the communication network. The battery pack management system 104 is responsible for receiving, processing and analyzing multiple measured data sent back by the sensors 103, and based on these multi-dimensional measured data, the battery pack management system 104 can comprehensively evaluate the health status of the battery pack 101 and determine whether it is damaged.

[0141] In the technical solution of the embodiment of the present application, the measured temperature of the battery pack, the measured temperature of the coolant in the cooling system, the measured flow rate and the measured flow resistance are obtained; the standard flow resistance is determined according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate; and the damage assessment result of the battery pack is determined according to the difference between the measured flow resistance and the standard flow resistance.

[0142] Among them, the standard flow resistance is determined according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow velocity, including: searching in the flow resistance map according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow velocity to obtain the standard flow resistance; the flow resistance map is used to characterize the correspondence between the flow resistance of the coolant and the temperature of the battery pack, the temperature of the coolant and the flow velocity.

[0143] In the technical solution of the embodiment of the present application, by obtaining multiple parameters such as the measured temperature of the battery pack, the measured temperature of the coolant in the cooling system, the measured flow rate and the measured flow resistance, the actual working conditions of the cooling system and the battery pack can be analyzed more comprehensively. Multi-parameter monitoring makes the evaluation process more accurate, reduces the misjudgment that may be caused by a single parameter, and thus more accurately evaluates the actual state of the battery pack. In addition, by continuously acquiring these measured data, real-time monitoring of the battery pack state can be achieved. When an abnormal situation occurs, the battery pack management system can respond immediately, reducing delays, thereby improving the timeliness of the evaluation.

[0144] In some embodiments, Fig.13 As shown, the cooling system includes an on-board water cooler 1021, a battery pack cooling plate 1022 and a coolant 1023; the battery pack cooling plate 1022 is arranged at the bottom of the battery pack 101; the coolant 1023, driven by the on-board water cooler 1021, flows into the water inlet of the battery pack cooling plate and flows out from the water outlet of the battery pack cooling plate.

[0145] The battery pack cooling plate 1022 is installed at the bottom of the battery pack 101 and directly contacts the battery pack. Its main function is to efficiently transfer the heat generated by the battery pack 101 during operation to the coolant 1023 through heat conduction.

[0146] The coolant 1023 circulates in the cooling system 102 to transfer heat. Driven by the onboard water chiller 1021, the coolant 1023 flows in from the water inlet of the battery pack cooling plate 1022, and absorbs the heat generated by the battery pack 101 when passing through the battery pack cooling plate 1022. After passing through the battery pack cooling plate 1022, the coolant 1023 flows out from the water outlet, taking the absorbed heat out of the battery pack 101.

[0147] The on-board water cooler 1021 is located outside the battery pack 101 and is responsible for providing power for the coolant 1023 to the entire cooling system 102 and cooling the coolant 1023 with heat after passing through the battery pack cooling plate 1022.

[0148] In the above embodiment, the entire cooling system establishes an effective heat exchange mechanism between the battery pack and the external environment through the circulation of the coolant. In this way, even under high load or long-term operation, the battery pack can be kept within the ideal temperature range through the cooling system, thereby extending the service life of the battery.

[0149] In some embodiments, Fig.14 As shown, the sensor 103 includes a first temperature sensor 1031 arranged at the battery pack 101, a second temperature sensor 1032, a flow rate sensor 1033 and a first pressure sensor 1034 arranged at the water inlet of the battery pack cooling plate 1022, and a second pressure sensor 1035 arranged at the water outlet of the battery pack cooling plate 1022.

[0150] The first temperature sensor 1031 is used to monitor the temperature of the battery pack 101 in real time. The second temperature sensor 1032 is used to measure the temperature of the coolant 1023 before entering the battery pack cooling plate 1022. The flow rate sensor 1033 is used to detect the flow rate of the coolant 1023 when entering the battery pack cooling plate 1022. The data of the flow rate sensor 1033 can help the battery pack management system 104 identify whether the coolant 1023 flows at the expected speed.

[0151] The first pressure sensor 1034 is used to measure the pressure of the coolant 1023 at the water inlet. The second pressure sensor 1035 is used to measure the pressure of the coolant 1023 at the water outlet. The data of the second pressure sensor 1035 is used in combination with the data of the first pressure sensor 1034 to provide a complete analysis of the coolant flow resistance, which helps to determine the overall health of the battery pack cooling plate 1022 and the operating efficiency of the cooling system 102.

[0152] In the above embodiments, the battery pack management system can obtain and analyze key parameters of the battery pack and the cooling system in real time through sensors.

[0153] In some embodiments, the vehicle also includes an on-board computer; the on-board computer is communicatively connected to the battery pack management system; the on-board computer is used to obtain damage assessment results from the battery pack management system and perform corresponding processing based on the damage assessment results.

[0154] The processing performed by the on-board computer may include: outputting prompt information, reducing the vehicle speed, etc.

[0155] In the above embodiment, due to the real-time communication between the on-board computer and the battery pack management system, the vehicle can obtain the damage assessment results of the battery pack in the shortest time. This instant feedback mechanism helps to take countermeasures at the early stage of the problem, reduce the further deterioration of potential problems, and enhance the safety and reliability of the vehicle. In addition, the on-board computer performs corresponding processing based on the damage assessment results, so that the processing measures can be more accurately targeted at specific problems. For example, when minor damage is detected, the on-board computer can selectively reduce the output power of the battery pack, and in the case of serious damage, it can issue an emergency stop command, which not only improves safety, but also maximizes the service life of the battery pack and the vehicle.

[0156] In an exemplary embodiment, an electronic device is provided. The electronic device may be a battery pack management system, and its internal structure diagram may be as follows: Fig.15As shown. The electronic device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the electronic device is used to store data in the battery pack damage assessment process. The input / output interface of the electronic device is used to exchange information between the processor and an external device. The communication interface of the electronic device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a battery pack damage assessment method is implemented.

[0157] Those skilled in the art will understand that Fig.15 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0158] According to some embodiments of the present application, there is also provided a non-transitory computer-readable storage medium including instructions, such as a memory including instructions, and the above instructions can be executed by a processor of an electronic device to complete the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0159] According to some embodiments of the present application, a computer program product is also provided, and when the computer program is executed by a processor, the above method can be implemented. The computer program product includes one or more computer instructions. When these computer instructions are loaded and executed on a computer, part or all of the above method can be implemented in whole or in part according to the process or function described in the embodiment of the present application.

[0160] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0161] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0162] The above-described embodiments only express several implementation methods of the present application, which is convenient for understanding the technical solutions of the present application in detail, but cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the protection scope of the attached claims described in the present application. Therefore, the protection scope of the patent of this application shall be based on the contents of the attached claims, and the description and drawings can be used to explain the contents of the claims.

Claims

1. A battery pack damage assessment method, characterized in that: The method comprises: Obtaining the measured temperature of a battery pack in a vehicle, the measured temperature of a coolant in a cooling system corresponding to the battery pack, the measured flow velocity, and the measured flow resistance; Determining a standard flow resistance according to the measured temperature of the battery pack, the measured temperature of the coolant, and the measured flow rate; Determining a damage assessment result of the battery pack according to a difference between the measured flow resistance and the standard flow resistance; Wherein, determining the standard flow resistance according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate includes: The standard flow resistance is obtained by searching in a flow resistance map according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow velocity; the flow resistance map is used to characterize the corresponding relationship between the flow resistance of the coolant and the temperature of the battery pack, the temperature of the coolant and the flow velocity; there is a corresponding relationship between the flow velocity and the number of collisions.

2. The method according to claim 1, characterized in that The method further comprises: Acquire and store the flow resistance map; the flow resistance map is established according to multiple experimental temperatures of the battery pack, multiple experimental temperatures of the coolant, multiple experimental flow rates, and multiple experimental flow resistances after experiments are conducted with the temperature of the battery pack, the temperature and flow rate of the coolant as variable quantities.

3. The method according to claim 1, characterized in that The determining the damage assessment result of the battery pack according to the difference between the measured flow resistance and the standard flow resistance includes: Calculating the flow resistance change between the measured flow resistance and the standard flow resistance; A damage assessment result of the battery pack is determined based on the flow resistance change and a preset change threshold.

4. The method according to claim 3, characterized in that The determining the damage assessment result of the battery pack according to the flow resistance change and a preset change threshold value includes: When the change in flow resistance is greater than the change threshold, it is determined that the damage assessment result of the battery pack is that the battery pack is abnormal.

5. The method according to any one of claims 1 to 4, characterized in that: The process of determining the measured flow resistance includes: Obtaining the water inlet pressure and the water outlet pressure of the battery pack cooling plate in the cooling system; The difference between the water inlet pressure and the water outlet pressure is determined as the measured flow resistance.

6. The method according to any one of claims 1 to 4, characterized in that: The method further comprises at least one of the following: Limiting the output power of the battery pack according to the damage assessment result; Output maintenance prompt information according to the damage assessment result.

7. A battery pack damage assessment device, characterized in that: The device comprises: A measured data acquisition module is used to obtain the measured temperature of the battery pack in the vehicle, the measured temperature of the coolant in the cooling system corresponding to the battery pack, the measured flow rate and the measured flow resistance; A standard flow resistance determination module, configured to determine a standard flow resistance according to a measured temperature of the battery pack, a measured temperature of the coolant, and a measured flow rate; An assessment result determination module, used to determine a damage assessment result of the battery pack according to a difference between the measured flow resistance and the standard flow resistance; Among them, the standard flow resistance determination module is used to search in the flow resistance map according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow velocity to obtain the standard flow resistance; the flow resistance map is used to characterize the correspondence between the flow resistance of the coolant and the temperature of the battery pack, the temperature of the coolant, and the flow velocity; there is a corresponding relationship between the flow velocity and the number of collisions.

8. A vehicle, characterized in that: The vehicle includes a battery pack, a cooling system, a plurality of sensors, and a battery pack management system; The battery pack is used to provide driving force for the vehicle; The cooling system is used to cool the battery pack; The sensor is used to detect the battery pack and the cooling system; The battery pack management system is used to determine a standard flow resistance according to the measured temperature of the battery pack, the measured temperature, the measured flow rate and the measured flow resistance of the coolant of the cooling system, and determine a damage assessment result of the battery pack according to a difference between the measured flow resistance and the standard flow resistance; Wherein, determining the standard flow resistance according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow rate includes: The standard flow resistance is obtained by searching in a flow resistance map according to the measured temperature of the battery pack, the measured temperature of the coolant and the measured flow velocity; the flow resistance map is used to characterize the corresponding relationship between the flow resistance of the coolant and the temperature of the battery pack, the temperature of the coolant and the flow velocity; there is a corresponding relationship between the flow velocity and the number of collisions.

9. The vehicle according to claim 8, characterized in that The cooling system includes an on-board water cooler, a battery pack cooling plate and a coolant; the battery pack cooling plate is arranged at the bottom of the battery pack; Driven by the on-board water cooler, the coolant flows into the battery pack cooling plate from the water inlet and flows out from the water outlet of the battery pack cooling plate.

10. The vehicle according to claim 9, characterized in that The sensor includes a first temperature sensor arranged at the battery pack, a second temperature sensor, a flow rate sensor and a first pressure sensor arranged at a water inlet of the battery pack cooling plate, and a second pressure sensor arranged at a water outlet of the battery pack cooling plate.

11. The vehicle according to any one of claims 8 to 10, characterized in that: The vehicle further comprises an onboard computer; the onboard computer is communicatively connected with the battery pack management system; The on-board computer is used to obtain the damage assessment result from the battery pack management system and perform corresponding processing according to the damage assessment result.

12. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 6 is implemented.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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