Power battery management method, device and equipment, readable storage medium and vehicle

Abstract

The invention provides a power battery management method, device and equipment, a readable storage medium and a vehicle, and the method comprises the steps: obtaining a target environment temperature and a target battery temperature of a power battery, and when the target environment temperature is changed from a first temperature to a second temperature, and the target battery temperature is changed from a third temperature to a fourth temperature, controlling the power battery to work; and switching the minimum electric quantity threshold value required for starting the engine of the vehicle from the first electric quantity threshold value to a second electric quantity threshold value, and controlling the electric quantity output of the power battery according to the second electric quantity threshold value. Therefore, when the environment temperature and the battery temperature of the power battery change, the minimum electric quantity threshold value of the power battery can be adjusted, so that the minimum electric quantity threshold value of the battery can be determined according to actual conditions, and the use efficiency of the power battery is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of transportation equipment, and in particular, relates to a power battery management method, device, equipment, readable storage medium and vehicle. Background Art

[0002] Hybrid vehicles include multiple energy sources such as engines and power batteries. The energy for starting the engine of some models comes from the power battery. When the battery power is lower than a certain threshold, the vehicle will not be able to start even if there is fuel. Therefore, in order to ensure that the vehicle can start smoothly next time, the power battery is usually set with a minimum threshold that can meet the engine start. When the power battery power threshold is lower than the minimum threshold, the vehicle drive system is prohibited from using the power of the power battery.

[0003] However, in the prior art, the above minimum threshold is often set as a fixed threshold, that is, in any case, as long as the power of the power battery is lower than the minimum threshold, the power battery will stop outputting power. However, this power battery management strategy has poor adaptability, cannot adjust the minimum threshold of the battery power according to the actual situation of the vehicle, and cannot fully utilize the power of the power battery. Summary of the invention

[0004] Embodiments of the present application provide a power battery management method, device, equipment, readable storage medium and vehicle to improve the utilization rate of the power battery.

[0005] In a first aspect, an embodiment of the present application provides a power battery management method, the method comprising:

[0006] Obtaining the target ambient temperature and the target battery temperature of the power battery;

[0007] When the target ambient temperature changes from the first temperature to the second temperature, and the target battery temperature changes from the third temperature to the fourth temperature, the minimum power threshold required for starting the engine of the vehicle is switched from the first power threshold to the second power threshold, wherein the first power threshold is the minimum power threshold corresponding to the first temperature and the third temperature, and the second power threshold is the minimum power threshold corresponding to the second temperature and the fourth temperature;

[0008] The power output of the power battery is controlled according to the second power threshold.

[0009] In a second aspect, an embodiment of the present application provides a power battery management device, the device comprising:

[0010] A first acquisition module, used to acquire a target ambient temperature and a target battery temperature of the power battery;

[0011] First, the module is used to switch the minimum power threshold required for starting the engine of the vehicle from the first power threshold to the second power threshold when the target ambient temperature changes from the first temperature to the second temperature and the target battery temperature changes from the third temperature to the fourth temperature, wherein the first power threshold is the minimum power threshold corresponding to the first temperature and the third temperature, and the second power threshold is the minimum power threshold corresponding to the second temperature and the fourth temperature;

[0012] A control module is used to control the power output of the power battery according to the second power threshold.

[0013] In a third aspect, an embodiment of the present application provides an electronic device, the device comprising:

[0014] A processor and a memory storing programs or instructions;

[0015] When the processor executes the program or instruction, the method of the first aspect is implemented.

[0016] In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the method of the first aspect described above is implemented.

[0017] In a fifth aspect, an embodiment of the present application provides a vehicle, comprising a power battery management device, wherein the power battery management device is used to implement the method of the first aspect above.

[0018] The power battery management method, device, equipment and readable storage medium of the embodiment of the present application can obtain the ambient temperature and the battery temperature of the power battery; when the target ambient temperature changes from the first temperature to the second temperature, and the target battery temperature changes from the third temperature to the fourth temperature, the minimum power threshold required to start the vehicle engine is switched from the first power threshold to the second power threshold, and the power output of the power battery is controlled based on the second power threshold. As a result, the minimum power threshold of the power battery can be adjusted when the ambient temperature and the battery temperature of the power battery change, so that the minimum power threshold of the battery can be determined according to the actual situation, thereby improving the use efficiency of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 It is a flowchart of a power battery management method provided by an embodiment of the present application;

[0021] Figure 2 is a structural schematic diagram of a power battery management device provided by another embodiment of the present application;

[0022] Figure 3 It is a schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0023] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0024] 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 statement "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0025] The state of charge (SOC) of the power battery, that is, the remaining power of the power battery.

[0026] The state of health (SOH) of the power battery refers to the capacity, health and performance status of the power battery, that is, the percentage of the full charge capacity of the power battery relative to the rated capacity.

[0027] The Battery Management System (BMS) is used to intelligently manage and maintain each battery unit, prevent the battery from overcharging and over-discharging, extend the battery life, and monitor the battery status.

[0028] Hybrid vehicles include multiple energy sources such as engines and power batteries. The energy for starting the engine of some models comes from the power battery. If the vehicle still has fuel, in order for the vehicle to start successfully, the power battery at this time needs to be able to successfully operate the engine; otherwise, the vehicle will have fuel but cannot drive.

[0029] In order to solve the above problems, the vehicle will set a threshold for stopping the vehicle (i.e., the minimum power threshold) - when the battery SOC is lower than this threshold, the vehicle drive system is not allowed to use the battery power; otherwise, the battery SOC will be too low at the end of this trip, and the remaining battery power may not be able to meet the engine start requirements when the vehicle is restarted next time. At present, at any temperature, SOC, and SOH, this threshold is usually fixed, usually taking into account the minimum SOC of the battery that can start the engine, the accuracy of the battery SOC estimation, and the worst case of various factors. The disadvantage of this approach is that the fixed threshold will excessively limit the vehicle's cruising range and reduce the driving experience, because the probability of the worst of all factors at the same time is small. In most cases, the actual minimum power threshold is lower than the above fixed threshold. Therefore, in fact, the power battery power can still continue to provide power to the vehicle's power system while ensuring that the battery can successfully start the engine when the user gets on the car next time, that is, the vehicle can still travel longer mileage.

[0030] Based on the above findings, in order to improve the utilization rate of the power of the power battery, the embodiments of the present application provide a power battery management method, device, equipment, storage medium and vehicle to solve the above technical problems.

[0031] The following first introduces the power battery management method provided in the embodiment of the present application.

[0032] Figure 1 A schematic diagram of a power battery management method provided in an embodiment of the present application. Figure 1 As shown, the following steps S101 to S103 may be included:

[0033] S101, obtaining a target ambient temperature and a target battery temperature of a power battery.

[0034] The target ambient temperature is the current temperature of the environment in which the power battery is located, and the target battery temperature is the current temperature of the power battery.

[0035] Specifically, the ambient temperature and the power battery temperature can be detected using a temperature sensor. The battery temperature of the power battery under the current working condition can also be obtained through the BMS to provide a basis for the subsequent determination of the minimum power threshold of the power battery.

[0036] The power battery may be a power battery in a hybrid vehicle.

[0037] S102, when the target ambient temperature changes from the first temperature to the second temperature and the target battery temperature changes from the third temperature to the fourth temperature, the minimum power threshold required for starting the vehicle engine is switched from the first power threshold to the second power threshold.

[0038] The minimum power threshold is the lower limit of the power battery power to ensure the engine starts. The first power threshold is the minimum power threshold corresponding to the first temperature and the third temperature, and the second power threshold is the minimum power threshold corresponding to the second temperature and the fourth temperature.

[0039] Different ambient temperatures, battery temperatures, battery health and other factors have different degrees of impact on the battery charge. In addition, the power required to start the engine at different ambient temperatures is also different. Therefore, the minimum power threshold required for the engine to start the power battery can be adjusted according to the corresponding minimum power thresholds at different ambient temperatures and battery temperatures.

[0040] S103: Controlling the power output of the power battery according to the second power threshold.

[0041] Specifically, when the power value of the power battery is greater than a second power threshold, the power battery is controlled to output power to the vehicle's drive system normally; when the power value of the power battery is less than or equal to the second power threshold, the power battery is controlled to stop outputting power to the vehicle's drive system.

[0042] The specific implementation of the above steps will be described in detail below.

[0043] In the embodiment of the present application, the target ambient temperature and the target battery temperature of the power battery can be obtained. When the target ambient temperature changes from the first temperature to the second temperature and the target battery temperature changes from the third temperature to the fourth temperature, the minimum power threshold required to start the vehicle engine is switched from the first power threshold to the second power threshold, and the power output of the power battery is controlled according to the second power threshold. Thus, when the ambient temperature and the battery temperature of the power battery change, the minimum power threshold of the power battery can be adjusted, so that the minimum power threshold of the battery can be determined according to the actual situation, thereby improving the use efficiency of the power battery.

[0044] In some embodiments, after the above S101, the following steps may also be included:

[0045] The first mapping relationship, the second mapping relationship, and the third mapping relationship are used to determine a minimum power threshold value required for the power battery to start the engine of the vehicle at a target ambient temperature and a target battery temperature.

[0046] Among them, the first mapping relationship is the mapping relationship between the ambient temperature and the starting power value required for engine starting, the second mapping relationship is the mapping relationship between the ambient temperature, the cumulative throughput of the power battery and the power error value, and the third mapping relationship is the mapping relationship between the battery temperature, the cumulative throughput of the power battery and the power error value.

[0047] In order to accurately determine the minimum power threshold of the power battery that can meet the vehicle engine start-up requirements, it is necessary to determine the minimum power threshold of the power battery corresponding to the ambient temperature and the battery temperature by comprehensively considering the ambient temperature and the battery temperature of the power battery. Therefore, the minimum power threshold of the power battery corresponding to different ambient temperatures and battery temperatures can be determined according to the predetermined first mapping relationship, the second mapping relationship, and the third mapping relationship.

[0048] Optionally, a deep learning method can also be used to determine the minimum power threshold of the power battery corresponding to different ambient temperatures and battery temperatures. Specifically, first, the battery data of the power battery is obtained, including different ambient temperatures, battery temperatures and the corresponding minimum power threshold. These data can be obtained through experiments or simulations, or can be historical battery data of the power battery; a prediction model is constructed through a deep learning algorithm, such as a neural network. The prediction model can take the ambient temperature and battery temperature as input and output the corresponding minimum power threshold. During the model training process, a labeled data set can be used to train the model. Through repeated iterative training, the model will gradually learn the complex relationship between the ambient temperature and battery temperature and the minimum power threshold, and obtain the final prediction model.

[0049] In some embodiments, the above-mentioned use of the first mapping relationship, the second mapping relationship, and the third mapping relationship to determine the minimum power threshold of the power battery at the target ambient temperature and the target battery temperature required for starting the engine of the vehicle may include the following steps:

[0050] Determining, based on the first mapping relationship and the second mapping relationship, a third power threshold value of the power battery required for starting an engine of the vehicle at a target ambient temperature;

[0051] Determining, based on the first mapping relationship and the third mapping relationship, a fourth power threshold value required for the power battery to meet the engine start of the vehicle at the target battery temperature;

[0052] The larger power threshold value between the third power threshold value and the fourth power threshold value is determined as the minimum power threshold value required for starting the engine of the vehicle.

[0053] Specifically, since the battery temperature will rise during the discharge process, and the temperature of the vehicle's environment will also change as the vehicle travels in different road environments, it is necessary to consider both the ambient temperature and the battery temperature when determining the minimum power threshold of the power battery. First, the third power threshold required for the power battery corresponding to the current ambient temperature to start the vehicle's engine can be determined based on the first mapping relationship and the second mapping relationship; and the fourth power threshold required for the power battery corresponding to the current battery temperature to start the vehicle's engine can be determined based on the first mapping relationship and the third mapping relationship. Then, in order to avoid the error caused by determining the minimum power threshold by using the battery temperature or the ambient temperature alone, it is ensured that the battery power of the power battery can meet the next start of the vehicle's generator under the minimum power threshold. Therefore, the power threshold with the larger value between the third power threshold and the fourth power threshold is determined as the minimum power threshold.

[0054] In this embodiment, when determining the minimum power threshold corresponding to the ambient temperature and the minimum power threshold corresponding to the battery temperature, the minimum power threshold with the larger value can be determined as the minimum power threshold corresponding to the current ambient temperature and battery temperature, thereby improving the accuracy of the minimum power threshold.

[0055] There is a certain mapping relationship between the ambient temperature and the amount of power required to start the engine. Generally, as the ambient temperature decreases, the amount of power required to start the engine increases. This is because in a low temperature environment, the chemical reaction rate of the battery slows down, the internal resistance of the battery increases, and the battery output capacity decreases. Therefore, in order to ensure that the engine can be started reliably under low temperature conditions, more power needs to be provided.

[0056] Therefore, in some embodiments, the first mapping relationship, that is, the mapping relationship between the ambient temperature and the starting power value required for starting the engine, can be determined by the following steps:

[0057] Obtain the engine starting power spectrum;

[0058] Obtain the mapping relationship between the minimum power threshold of the power battery and SOH and ambient temperature;

[0059] The mapping relationship between the minimum power threshold of the power battery and the SOH and ambient temperature and the above-mentioned starting power spectrum, the mapping relationship between the ambient temperature and the starting power value required for the engine to start is obtained. Among them, the engine starting power spectrum is a distribution spectrum describing the power of each frequency component during the engine starting process. It can be used to represent the power demand and response of each component when the engine is started at different frequencies.

[0060] In one example, SOH (battery health) can be calculated by the ratio of the actual capacity of the battery to the rated capacity. The greater the battery health, the greater the battery's ability to store electricity. The smaller the battery health, the smaller the battery's ability to store electricity.

[0061] In one example, the battery SOH can be obtained by building a mathematical model of the battery pack and collecting vehicle driving data to fit and calculate the resistance; or the battery SOC can be estimated during the charging or discharging process and calculated with the accumulated capacity of the entire process to obtain the battery SOH. It is also possible to test or simulate in an equivalent manner, such as obtaining the battery internal resistance growth rate corresponding to different SOHs through electrochemical principles, and determining the SOH through the battery internal resistance growth rate.

[0062] In one example, under different ambient temperatures, battery temperatures, and battery SOH, the lowest voltage or minimum power that the battery can withstand is determined based on the battery's safety margin. Then, by means of simulation or testing, the engine's starting power spectrum is loaded onto the battery to obtain the minimum SOC matrix for the power battery to start the engine under different conditions, as shown in the following table. Above this SOC, the battery can provide corresponding power when the engine is started, and the battery will not exceed its own safety margin.

[0063] For the minimum SOC matrix of different SOHs, since the batteries with corresponding SOHs are not convenient to obtain, they can be tested or simulated in an equivalent way. For example, the growth rate of the battery internal resistance corresponding to different SOHs can be obtained through electrochemical principles, and then this growth rate is superimposed on the power spectrum during testing or simulation to simulate the state after the SOH decreases.

[0064] In some embodiments, the SOC error also needs to be considered when setting the minimum power threshold, otherwise the SOC at the last stop may be too low, resulting in the actual remaining power of the power battery being very low and the battery no longer having the ability to start the engine. Factors affecting the SOC estimation error include hardware error, inadequacy of the SOC algorithm itself, SOH estimation error, the time and temperature required for SOC correction, etc. These factors can be used to infer the SOC error and the corresponding operating conditions.

[0065] Therefore, in some embodiments, the relationship between the cumulative throughput and the SOC error can be calculated based on the manufacturing accuracy of the sensor (for example, when the SOC is continuously charged and discharged without correction opportunities for a long time, the acquisition error of the current sensor will gradually increase and the accuracy of the SOC will gradually decrease.), so that the corresponding SOC error, i.e., the charge error value, can be determined based on the cumulative throughput.

[0066] The second mapping relationship, i.e., the mapping relationship between the ambient temperature, the cumulative throughput of the power battery and the power error value, can be determined by the following steps:

[0067] Data collection: Collect actual operating data related to ambient temperature, cumulative throughput of the power battery, and power error. This includes the measurement of ambient temperature, cumulative throughput (charge / discharge times or total power consumption) during battery use, and measurement of power error.

[0068] Data analysis: Analyze the collected data to explore possible correlations. Statistical methods and data mining techniques can be used to find correlations between variables. For example, correlation coefficient analysis can be used to evaluate the linear or nonlinear correlation between ambient temperature, cumulative throughput, and power error.

[0069] Model building: Based on the data analysis results, a mathematical model or machine learning model is built to describe the mapping relationship between ambient temperature, cumulative throughput of the power battery, and power error. According to the results of the data analysis, an appropriate model type is selected, such as linear regression, polynomial regression, support vector machine (SVM), neural network, etc.

[0070] Model validation and tuning: Apply the established model to a new data set to validate and evaluate the model’s accuracy and predictive ability. If the model does not work well, you can try to adjust parameters, perform feature engineering, or choose another model to improve model performance.

[0071] In some embodiments, the method for determining the third mapping relationship, i.e., the mapping relationship between the battery temperature, the accumulated throughput of the power battery and the power error value, is similar to the method for determining the second mapping relationship, and thus will not be described in detail.

[0072] In some embodiments, the above-mentioned determination that the power battery meets the third power threshold required for starting the engine of the vehicle at the ambient temperature may include the following steps:

[0073] Based on the first mapping relationship, determining an initial power threshold value of the power battery required for starting an engine of the vehicle at a target ambient temperature;

[0074] Based on the second mapping relationship, determining a first power error value of the power battery;

[0075] The sum of the initial power threshold, the reserved power value and the first power error value is determined as the third power threshold, and the reserved power value is the sum of the fault threshold of the power battery and the minimum power threshold required for components other than the engine in the vehicle.

[0076] Among them, the starting power value is the power required to start the engine, that is, the power provided by the power battery required to start the engine. The target power and total duration required by the power battery to start the engine can be determined according to the characteristics of the engine, such as 15kW for 5s and then 5kW for 5s. The minimum SOC that the battery can meet with the power and duration, that is, the starting power value, can be obtained through testing or simulation based on the target power and total duration.

[0077] The reserved power value includes the power reserved for the battery itself and the power reserved for other parts of the vehicle. The power reserved for the battery itself is the battery failure threshold, that is, the minimum power limit of the battery. If it is lower than this threshold, the battery may be damaged. It is usually provided by the manufacturer of single cells or cells. If the battery power is lower than the battery failure threshold and continues to discharge, it may cause the internal pressure of the battery to increase, the reversibility of the positive and negative active materials will be damaged, and the capacity of the battery will be significantly reduced, causing damage to the battery.

[0078] Based on the first mapping relationship, an initial power threshold for starting the engine at the target ambient temperature may be determined.

[0079] The first power error value is the power error value of the battery power estimation under the corresponding ambient temperature. The power error value is the error value between the battery power value and the true value. The first power error value under the target ambient temperature can be determined through the second mapping relationship.

[0080] Specifically, the minimum power threshold corresponding to the ambient temperature needs to meet the power requirement for the engine to start at the ambient temperature, while retaining the reserved power of the power battery, and also needs to consider the power error in the battery power estimation. Therefore, the minimum power threshold corresponding to the ambient temperature can be the sum of the starting power value corresponding to the ambient temperature, the first reserved power value and the power error value.

[0081] In some embodiments, the above-mentioned determination that the power battery meets the fourth power threshold required for starting the engine of the vehicle at the battery temperature includes:

[0082] Based on the first mapping relationship, determining an initial power threshold value of the power battery required for starting an engine of the vehicle at a target ambient temperature;

[0083] Determine a second power error value of the power battery at the target battery temperature based on a third mapping relationship, where the third mapping relationship is a mapping relationship between the accumulated throughput of the power battery, the battery temperature, and the power error value;

[0084] The sum of the initial power threshold, the second power error value and the reserved power value is determined as the fourth power threshold.

[0085] Among them, the reserved power value is the reserved power value of the power battery, including the battery's failure threshold load and the reserved power values ​​of other components of the vehicle.

[0086] Specifically, the minimum power threshold corresponding to the battery temperature needs to meet the required power for the engine to start at the current ambient temperature, while retaining the reserved power of the power battery, and also needs to consider the power error in the battery power estimation. Therefore, the minimum power threshold corresponding to the battery temperature can be the sum of the starting power value, the reserved power value and the second power error value corresponding to the current ambient temperature.

[0087] Based on the first mapping relationship, an initial power threshold for starting the engine at the target ambient temperature may be determined.

[0088] The second power error value is the power error value of the battery power estimation at the corresponding battery temperature. The power error value is the error value between the battery power value and the true value. The second power error value at the target battery temperature can be determined through the third mapping relationship.

[0089] In one example, the power battery management method provided in the above embodiment may specifically include the following steps:

[0090] 1. Under different ambient temperatures, determine the target power, total duration and other information required by the power battery for engine start-up based on the characteristics of the engine, for example, 15kW for 5s followed by 5kW for 5s.

[0091] 2. Determine the starting power value, reserved power value and power error value.

[0092] (1) Determine the starting power value: The starting power value is calculated based on information such as target power and total duration.

[0093] (2) Determine the reserved power value: Under different ambient temperatures or battery temperatures and battery SOH, determine the minimum voltage or minimum power that the battery can withstand based on the battery's safety margin. At this starting power value, load the engine's starting power spectrum, and the actual voltage / power of the battery cannot be lower than the above minimum voltage / power.

[0094] Under different ambient temperatures and battery SOH, determine the lowest voltage or minimum power that the battery can withstand based on the safety margin of the battery at different ambient temperatures;

[0095] For different battery temperatures and battery SOH, the minimum voltage or minimum power that the battery can withstand is determined according to the safety margin of the battery at different battery temperatures, as shown in Table 1:

[0096]

[0097] Table 1

[0098] (3) Determine the power error value: Factors that affect the SOC estimation error include hardware error, insufficient SOC algorithm itself, SOH estimation error, time and temperature required for SOC correction, etc. These factors can be used to infer the SOC error and the corresponding operating conditions, as shown in Table 2. For example, when the SOC is continuously charged and discharged and there is no correction opportunity for a long time, the acquisition error of the current sensor will gradually increase, and the accuracy of the SOC will gradually decrease. Therefore, the relationship between the cumulative throughput and the SOC error can be inferred based on the manufacturing accuracy of the sensor. Therefore, the power error value is determined by collecting the cumulative throughput of the battery.

[0099]

[0100] Table 2

[0101] For different ambient temperatures, battery SOH and cumulative throughput, a first error value of the battery is determined according to the safety boundary of the battery at different ambient temperatures;

[0102] For different battery temperatures, battery SOH and accumulated throughput, a second error value of the battery is determined according to a safety margin of the battery at different battery temperatures.

[0103] 3. Determine the minimum power threshold under different ambient temperatures or different battery temperatures.

[0104] (1) Determine the minimum power threshold under different ambient temperatures: add the startup power value, the reserved power value corresponding to the ambient temperature, and the power error value.

[0105] (2) Determine the minimum power threshold at different battery temperatures: Determine the starting power value, the reserved power value corresponding to the battery temperature, and the power error value and add them together to obtain the minimum power threshold, as shown in Table 3: Since when the battery temperature changes, the ambient temperature can be assumed to be unchanged, so the starting power value is fixed. Therefore, Table 3 only reflects the reserved power value and power error value corresponding to the battery temperature.

[0106]

[0107] Table 3

[0108] Specifically, the minimum power threshold can be set according to the minimum SOC (starting power value plus reserved power value) for starting the engine at different temperatures and the SOC error. The simplest way is to add and set. It is also possible to consider reserving a portion of power for other components so that when the battery power is less than or equal to the minimum power threshold, after the vehicle stops driving, even if there are SOC errors, low battery temperature and other factors, as long as there is fuel, the user can still drive the next time instead of staying where he is. Based on the above content, it can be seen that the minimum battery SOC for successfully starting the engine at different temperatures may be different, the battery SOC error often changes, and the power reserved for other components is also different, so there will be different stopping thresholds under different user conditions, or dynamic changes, as shown in Table 3.

[0109] In some embodiments, the above S103 may include the following steps:

[0110] When the first power threshold is greater than the second power threshold, the lowest power threshold is kept unchanged.

[0111] Specifically, in a low-temperature environment, the battery temperature will increase as the charging / discharging progresses, and the minimum power threshold will gradually decrease. In this case, if there is no restriction, the vehicle will be unable to start the next day due to excessive discharge the previous day. Therefore, at the beginning of each driving, the initial stop driving threshold should be determined based on the ambient temperature, battery temperature and other factors. During the subsequent driving process, the threshold can only be increased, not decreased.

[0112] In some embodiments, after the above S103, the following steps may also be included:

[0113] Get the power value of the power battery;

[0114] When the power value of the power battery is lower than the fifth power threshold, the minimum power threshold is kept unchanged.

[0115] Specifically, during vehicle driving, the power battery will continue to discharge, the battery power will continue to decrease, and the battery temperature will also change, which will cause large fluctuations in the determination of the minimum power. To avoid the situation where the minimum power threshold suddenly increases and the battery power is less than the minimum power threshold, causing the vehicle to suddenly stop, therefore, when the battery power is lower than the third threshold, the minimum power threshold is kept unchanged to improve the stability of vehicle driving.

[0116] Based on the power battery management method provided in the above embodiment, the present application also provides a specific implementation of a power battery management device. Please refer to the following embodiments.

[0117] See first Figure 2The power battery management device 200 provided in the embodiment of the present application may include the following modules:

[0118] A first acquisition module 201 is used to acquire the ambient temperature and the battery temperature of the power battery;

[0119] The switching module 202 is used to switch the minimum power threshold required for starting the vehicle engine from the first power threshold to the second power threshold when the target ambient temperature changes from the first temperature to the second temperature and the target battery temperature changes from the third temperature to the fourth temperature, wherein the first power threshold is the minimum power threshold corresponding to the first temperature and the third temperature, and the second power threshold is the minimum power threshold corresponding to the second temperature and the fourth temperature.

[0120] The control module 203 is used to control the power output of the power battery according to the second power threshold.

[0121] In some embodiments, the power battery management device 200 further includes:

[0122] First, the module is determined to determine the minimum power threshold required for the power battery to meet the engine start of the vehicle at the target ambient temperature and the target battery temperature by using the first mapping relationship, the second mapping relationship and the third mapping relationship, the first mapping relationship being the mapping relationship between the ambient temperature and the starting power value required for the engine start, the second mapping relationship being the mapping relationship between the ambient temperature and the cumulative throughput and power error value of the power battery, and the third mapping relationship being the mapping relationship between the battery temperature and the cumulative throughput and power error value of the power battery.

[0123] In some embodiments, the first determining module includes:

[0124] A first determining unit is used to determine, based on the first mapping relationship and the second mapping relationship, a third power threshold value of the power battery required for starting an engine of the vehicle at a target ambient temperature;

[0125] A second determining unit is used to determine, based on the first mapping relationship and the third mapping relationship, that the power battery satisfies a fourth power threshold required for starting an engine of the vehicle at a target battery temperature;

[0126] The third determining unit is used to determine the larger power threshold value between the third power threshold value and the fourth power threshold value as the minimum power threshold value required for starting the engine of the vehicle.

[0127] In some embodiments, the first determining unit includes:

[0128] A first determination subunit is used to determine, based on the first mapping relationship, an initial power threshold value of the power battery required for starting the engine of the vehicle at a target ambient temperature;

[0129] A second determining subunit, configured to determine a first power error value of the power battery based on a second mapping relationship;

[0130] The third determination subunit is used to determine the larger power threshold value between the third power threshold value and the fourth power threshold value as the minimum power threshold value required for starting the engine of the vehicle.

[0131] In some embodiments, the second determining unit includes:

[0132] A fourth determination subunit is used to determine, based on the first mapping relationship, an initial power threshold value of the power battery required for starting an engine of the vehicle at a target ambient temperature;

[0133] a fifth determining subunit, configured to determine a second power error value of the power battery at a target battery temperature based on a third mapping relationship, wherein the third mapping relationship is a mapping relationship between a cumulative throughput of the power battery, the battery temperature, and the power error value;

[0134] The sixth determining subunit is used to determine the sum of the initial power threshold, the second power error value and the reserved power value as the fourth power threshold.

[0135] In some embodiments, the power battery management device 200 may further include:

[0136] The third determination module is configured to keep the minimum power threshold unchanged when the first power threshold is greater than the second power threshold.

[0137] In some embodiments, the power battery management device 200 may further include:

[0138] The second acquisition module is used to obtain the power value of the power battery;

[0139] The fourth determination module is used to keep the minimum power threshold unchanged when the power value of the power battery is lower than the fifth power threshold.

[0140] The above-mentioned embodiment of the present application can obtain the target ambient temperature and the target battery temperature of the power battery. When the target ambient temperature changes from the first temperature to the second temperature, and the target battery temperature changes from the third temperature to the fourth temperature, the minimum power threshold required for starting the vehicle's engine is switched from the first power threshold to the second power threshold, and the power output of the power battery is controlled according to the second power threshold. Thus, when the ambient temperature and the battery temperature of the power battery change, the minimum power threshold of the power battery can be adjusted, so that the minimum power threshold of the battery can be determined according to actual conditions, and the use efficiency of the power battery is improved; according to the mapping relationship between the ambient temperature and the starting power value required for starting the engine, the mapping relationship between the ambient temperature and the cumulative throughput and power error value of the power battery, and the mapping relationship between the battery temperature and the cumulative throughput and power error value of the power battery, the minimum power threshold required for starting the vehicle's engine is determined at the ambient temperature and the battery temperature; based on the minimum power threshold, the power output of the power battery is controlled. Thus, the minimum power threshold of the power battery can be determined in combination with the ambient temperature and the battery temperature of the power battery, so that the minimum power threshold of the battery can be determined according to actual conditions, and the use efficiency of the power battery is improved.

[0141] Figure 2 Each module / unit in the device shown has the function of realizing Figure 1 The functions of each step in the process can achieve the corresponding technical effects, which will not be described in detail here for the sake of brevity.

[0142] Based on the power battery management device provided in the above embodiment, the present application also provides a vehicle accordingly, the vehicle comprising: the above power battery management device, the power battery management device is used to implement the power battery management method provided in the above embodiment.

[0143] Based on the power battery management method provided in the above embodiment, the present application also provides a specific implementation method of the electronic device accordingly. Please refer to the following embodiment.

[0144] Figure 3 A schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present application is shown.

[0145] The electronic device may include a processor 301 and a memory 302 storing computer program instructions.

[0146] Specifically, the processor 301 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0147] The memory 302 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 302 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In one example, the memory 302 may include a removable or non-removable (or fixed) medium, or the memory 402 is a non-volatile solid-state memory. The memory 302 may be inside or outside the integrated gateway disaster recovery device.

[0148] In one example, the memory 302 may be a read-only memory (ROM). In one example, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0149] The memory 302 may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical or other physical / tangible memory storage device. Thus, typically, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to any embodiment of the present disclosure.

[0150] The processor 301 reads and executes the computer program instructions stored in the memory 302 to implement Figure 1 The method / steps S101 to S104 in the embodiment shown in the figure are achieved Figure 1 The corresponding technical effects achieved by executing the methods / steps in the example shown are not repeated here for the sake of brevity.

[0151] In one example, the electronic device may further include a communication interface 303 and a bus 310. Figure 3As shown, the processor 301, the memory 302, and the communication interface 303 are connected via a bus 310 and communicate with each other.

[0152] The communication interface 303 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiments of the present application.

[0153] Bus 310 includes hardware, software or both, and the components of online data flow billing equipment are coupled to each other. For example, but not limitation, bus may include accelerated graphics port (Accelerated Graphics Port, AGP) or other graphics bus, enhanced industry standard architecture (Extended Industry Standard Architecture, EISA) bus, front side bus (Front Side Bus, FSB), Hyper Transport (Hyper Transport, HT) interconnection, industry standard architecture (Industry Standard Architecture, ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 310 may include one or more buses. Although the present application embodiment describes and shows a specific bus, the present application considers any suitable bus or interconnection.

[0154] Based on the power battery management device provided in the above embodiment, accordingly, the present application also provides a vehicle, the vehicle comprising: the above power battery management device, the power battery management device is used to implement the power battery management method provided in the above embodiment.

[0155] In addition, in combination with the power battery management method in the above embodiments, the present application embodiment can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any power battery management method in the above embodiments is implemented.

[0156] In summary, the power battery management method, device, vehicle equipment and computer storage medium of the embodiment of the present application can obtain the ambient temperature and the battery temperature of the power battery; determine the minimum power threshold of the power battery required for the engine start of the vehicle under the ambient temperature and the battery temperature; and control the power output of the power battery based on the minimum power threshold. Therefore, the minimum power threshold of the power battery can be determined in combination with the ambient temperature and the battery temperature of the power battery, so that the minimum power threshold of the battery can be determined according to the actual situation, thereby improving the use efficiency of the power battery.

[0157] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0158] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), appropriate firmware, plug-in, function card, etc. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or communication link by a data signal carried in a carrier. "Machine-readable medium" may include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (Radio Frequency, RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0159] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0160] The above reference is according to the method of the embodiment of the present application, the flow chart of the device (system) and the computer program product and / or the block diagram described various aspects of the present application.It should be understood that each square box in the flow chart and / or the block diagram and the combination of each square box in the flow chart and / or the block diagram can be realized by computer program instructions.These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the realization of the function / action specified in one or more square boxes of the flow chart and / or the block diagram.Such a processor can be but is not limited to a general-purpose processor, a special-purpose processor, a special application processor or a field programmable logic circuit.It can also be understood that each square box in the block diagram and / or the flow chart and the combination of the square boxes in the block diagram and / or the flow chart can also be realized by the dedicated hardware that performs the specified function or action, or can be realized by the combination of dedicated hardware and computer instructions.

[0161] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A power battery management method, characterized in that: The method comprises: Obtaining the target ambient temperature and the target battery temperature of the power battery; When the target ambient temperature changes from the first temperature to the second temperature, and the target battery temperature changes from the third temperature to the fourth temperature, the minimum power threshold required for starting the engine of the vehicle is switched from the first power threshold to the second power threshold, wherein the first power threshold is the minimum power threshold corresponding to the first temperature and the third temperature, and the second power threshold is the minimum power threshold corresponding to the second temperature and the fourth temperature; The power output of the power battery is controlled according to the second power threshold.

2. The method according to claim 1, characterized in that: After obtaining the target ambient temperature and the target battery temperature of the power battery, the method further includes: The first mapping relationship, the second mapping relationship and the third mapping relationship are used to determine the minimum power threshold value of the power battery required for starting the vehicle engine at the target ambient temperature and the target battery temperature. The first mapping relationship is a mapping relationship between the ambient temperature and the starting power value required for starting the engine. The second mapping relationship is a mapping relationship between the ambient temperature, the cumulative throughput of the power battery and the power error value. The third mapping relationship is a mapping relationship between the battery temperature, the cumulative throughput of the power battery and the power error value.

3. The method according to claim 2, characterized in that The determining, by using the first mapping relationship, the second mapping relationship, and the third mapping relationship, of a minimum power threshold value required for the power battery to meet the engine start of the vehicle at the target ambient temperature and the target battery temperature includes: Determining, based on the first mapping relationship and the second mapping relationship, a third power threshold value of the power battery required for starting an engine of the vehicle at the target ambient temperature; Based on the first mapping relationship and the third mapping relationship, determining that the power battery meets a fourth power threshold required for starting an engine of the vehicle at the target battery temperature; The larger power threshold value between the third power threshold value and the fourth power threshold value is determined as the minimum power threshold value required for starting the engine of the vehicle.

4. The method according to claim 3, characterized in that The determining, based on the first mapping relationship and the second mapping relationship, that the power battery meets a third power threshold required for starting the engine of the vehicle at the target ambient temperature includes: Based on the first mapping relationship, determining an initial power threshold value of the power battery required for starting an engine of the vehicle at the target ambient temperature; Based on the second mapping relationship, determining a first power error value of the power battery; The sum of the initial power threshold, the reserved power value and the first power error value is determined as the third power threshold, and the reserved power value is the sum of the fault threshold of the power battery and the minimum power threshold required to meet the requirements of the components in the vehicle except the engine.

5. The method according to claim 3, characterized in that: The determining, based on the first mapping relationship and the third mapping relationship, that the power battery satisfies a fourth power threshold required for starting an engine of the vehicle at the target battery temperature includes: Based on the first mapping relationship, determining an initial power threshold value of the power battery required for starting an engine of the vehicle at the target ambient temperature; determining a second power error value of the power battery at the target battery temperature based on a third mapping relationship, wherein the third mapping relationship is a mapping relationship between the accumulated throughput of the power battery, the battery temperature, and the power error value; The sum of the initial power threshold, the second power error value and the reserved power value is determined as the fourth power threshold.

6. The method according to any one of claims 1 to 5, characterized in that The controlling the power output of the power battery according to the second power threshold comprises: When the first power threshold is greater than the second power threshold, the minimum power threshold is kept unchanged.

7. The method according to any one of claims 1 to 5, characterized in that After controlling the power output of the power battery according to the second power threshold, the method further includes: Obtaining the power value of the power battery; When the power value of the power battery is lower than the fifth power threshold, the minimum power threshold is kept unchanged.

8. A power battery management device, characterized in that: The device comprises: A first acquisition module, used to acquire a target ambient temperature and a target battery temperature of the power battery; First, the module is used to switch the minimum power threshold required for starting the engine of the vehicle from the first power threshold to the second power threshold when the target ambient temperature changes from the first temperature to the second temperature and the target battery temperature changes from the third temperature to the fourth temperature, wherein the first power threshold is the minimum power threshold corresponding to the first temperature and the third temperature, and the second power threshold is the minimum power threshold corresponding to the second temperature and the fourth temperature; A control module is used to control the power output of the power battery according to the second power threshold.

9. An electronic device, characterized in that: The device comprises: A processor and a memory storing programs or instructions; When the processor executes the program or the instruction, the method according to any one of claims 1 to 7 is implemented.

10. A readable storage medium, characterized in that: The readable storage medium stores a program or an instruction, and when the program or the instruction is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

11. A vehicle, characterized in that: The vehicle comprises a power battery management device, and the power battery management device is used to implement the method according to any one of claims 1 to 7.

Images