Power battery temperature correction method, device, equipment and storage medium

Abstract

The present application provides a method, device, equipment, and storage medium for correcting the temperature of a power battery, which relates to the field of battery optimization control technology and is used to correct the cell temperature output by a temperature sensor so that it is closer to the actual cell temperature and ensures vehicle driving safety. The method determines, based on the driving parameters of a hybrid vehicle, whether the current scenario meets the correction scenario conditions for the power battery. Based on the first cell temperature of a first type of battery module whose degree of influence from engine heat radiation is greater than a preset threshold output by the temperature sensor and the second cell temperature of a second type of battery module other than the first type of battery module, the correction activation conditions for the first type of battery module are determined. After the correction is activated, a temperature correction reference value for the first type of battery module is determined based on the second cell temperature. Then, a temperature correction target value for the first type of battery module is determined in combination with the first cell temperature. The first cell temperature output by the temperature sensor is corrected based on the determined temperature correction target value.

Description

Technical Field

[0001] The present application relates to the technical field of battery optimization control, and in particular to a temperature correction method, device, equipment and storage medium for a power battery. Background Art

[0002] A hybrid vehicle is a new type of vehicle that is powered by a gasoline engine and a power battery. Compared to traditional internal combustion engine vehicles, it has higher energy utilization and is more environmentally friendly. Compared to pure electric vehicles (BEVs), it has a longer driving range and a wider range of applications.

[0003] Due to limited interior space, hybrid vehicle (HEV) engine exhaust pipes are typically located near the power battery. When the HEV engine is running, it generates high-temperature waste heat that must be discharged through the exhaust pipe. However, in high-temperature environments, when the engine is operating at high power and the vehicle is traveling at a low speed, the high-temperature radiation from the exhaust pipe cannot be promptly carried away by the moving air. The power battery module adjacent to the exhaust pipe is affected by this thermal radiation, as the copper or aluminum rakes on the cell poles are affected more significantly than the cell itself. Consequently, the temperature recorded by the temperature sensor no longer accurately reflects the actual temperature of the power battery module's cells. This causes the vehicle's battery thermal management strategy to malfunction, significantly impacting vehicle safety. Summary of the Invention

[0004] In view of the above problems, the embodiments of the present application provide a temperature correction method, device, equipment and storage medium for a power battery, which are used to correct the battery cell temperature output by the temperature sensor to make it closer to the actual battery cell temperature, so that the car can perform battery thermal management normally and ensure vehicle driving safety.

[0005] In one aspect, a method for correcting the temperature of a power battery is provided, which is applied to a hybrid vehicle. The hybrid vehicle includes a power battery and an engine. The power battery includes a first type of battery module whose degree of influence by heat radiation from the engine is greater than a preset threshold, and a second type of battery module other than the first type of battery module. The method includes:

[0006] determining, based on driving parameters of the hybrid vehicle, a correction scenario condition satisfying the power battery;

[0007] determining, based on a first cell temperature of the first type of battery module and a second cell temperature of the second type of battery module output by a temperature sensor, whether a correction start-up condition of the first type of battery module is satisfied;

[0008] Determining a temperature correction reference value of the first type of battery module based on the second battery core temperature;

[0009] Determining a temperature correction target value for the first type of battery module based on the temperature correction reference value and the first battery cell temperature;

[0010] Based on the temperature correction target value, the first battery cell temperature output by the temperature sensor is corrected.

[0011] In one aspect, a power battery temperature correction device is provided for use in a hybrid vehicle. The hybrid vehicle includes a power battery and an engine. The power battery includes a first type of battery module whose degree of influence by heat radiation from the engine is greater than a preset threshold, and a second type of battery module other than the first type of battery module. The device includes:

[0012] a scenario determination unit, configured to determine, based on driving parameters of the hybrid vehicle, a correction scenario condition satisfying the power battery;

[0013] a correction start-up unit, configured to determine whether a correction start-up condition of the first type of battery module is satisfied based on a first cell temperature of the first type of battery module and a second cell temperature of the second type of battery module output by a temperature sensor;

[0014] a parameter determination unit, configured to determine a temperature correction reference value of the first type of battery module based on the temperature of the second battery core;

[0015] a target determination unit, configured to determine a temperature correction target value for the first type of battery module based on the temperature correction reference value and the first battery cell temperature;

[0016] A temperature correction unit is configured to correct the first battery core temperature output by the temperature sensor based on the temperature correction target value.

[0017] Optionally, the driving parameters include the driving speed and the power value of the engine, and the scene determination unit is specifically configured to:

[0018] Extracting a first speed characteristic value and a power characteristic value corresponding to a first time period based on the driving speed and the power value within a first time period of a first preset length from a current moment;

[0019] If the first speed characteristic value is less than a first speed characteristic threshold, and the power characteristic value is greater than a preset power characteristic threshold, it is determined that the correction scenario condition is met.

[0020] Optionally, the first type of battery module includes at least one first battery module, and the second type of battery module includes at least one second battery module, and the correction start unit is specifically used to:

[0021] Determining an operating temperature characteristic value of the power battery based on a first battery cell temperature of each first battery module and a second battery cell temperature of each second battery module;

[0022] determining a temperature correction critical value based on the second battery cell temperature of each second battery module;

[0023] When the operating temperature characteristic value is not greater than the operating temperature upper limit value, and the battery cell temperature of any first battery module is not less than the temperature correction critical value, it is determined that the temperature correction condition is met.

[0024] Optionally, the cell temperature of each battery module includes the cell edge temperature and the cell middle temperature, and the correction start unit is specifically used to:

[0025] When the operating temperature characteristic value is not greater than the operating temperature upper limit value, and the cell edge temperature of any one of the first battery modules is not less than the temperature correction critical value, it is determined that the temperature correction condition is met.

[0026] Optionally, the target determination unit is specifically configured to:

[0027] For each of the first battery modules, perform the following operations:

[0028] The temperature correction target value is determined based on a first difference between a cell edge temperature and a cell middle temperature of the first battery module and the temperature correction reference value.

[0029] Optionally, the temperature correction unit is specifically used to:

[0030] For each of the first battery modules, perform the following operations respectively:

[0031] determining a second difference between the first battery cell temperature and the temperature correction target value;

[0032] Adjusting the temperature compensation value of the temperature sensor based on a first adjustment rate in a preset temperature adjustment strategy until the temperature compensation value is adjusted to the second difference;

[0033] The sum of the first battery cell temperature and the temperature compensation value is determined as the actual battery cell temperature for battery thermal management of the first type of battery module.

[0034] Optionally, the device further comprises a correction closing unit, configured to:

[0035] If the degree to which the first type of battery module is affected by the heat radiation of the engine is not greater than the preset threshold, determining that the modified shutdown condition of the power battery is met;

[0036] Adjusting the temperature compensation value based on a second adjustment rate in a preset temperature adjustment strategy until the temperature compensation value is adjusted to zero, wherein the second adjustment rate is less than the first adjustment rate;

[0037] Determine the sum of the first battery cell temperature and the temperature compensation value as the actual battery cell temperature; or,

[0038] The first battery core temperature is determined as the actual battery core temperature.

[0039] Optionally, the correction closing unit is specifically configured to:

[0040] When any of the following conditions is met, it is determined that the degree to which the first type of battery module is affected by the heat radiation of the engine is not greater than the preset threshold:

[0041] A second speed characteristic value corresponding to a second time period of a second preset length from the current moment is not less than a second speed characteristic threshold;

[0042] The operating temperature characteristic value of the power battery is greater than the upper limit of the operating temperature;

[0043] When the duration of the temperature correction of the first type of battery module is not less than the preset duration threshold, and the correction scenario condition and the correction start condition are not met.

[0044] In one aspect, a hybrid vehicle is provided, comprising a power battery and an engine, and a temperature correction device for the power battery.

[0045] In one aspect, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any one of the above methods when executing the computer program.

[0046] In one aspect, a computer storage medium is provided, on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the steps of any of the above methods are implemented.

[0047] The beneficial effects of the embodiments of the present application are as follows:

[0048] In an embodiment of the present application, it is determined that the current scenario meets the correction scenario conditions of the power battery based on the driving parameters of the hybrid vehicle, and the correction start-up conditions of the first type of battery module are determined based on the first cell temperature of the first type of battery module whose degree of influence by the heat radiation of the engine is greater than a preset threshold value and the second cell temperature of the second type of battery module other than the first type of battery module output by the temperature sensor. After the correction is turned on, the temperature correction reference value of the first type of battery module is determined based on the second cell temperature, and then the temperature correction target value of the first type of battery module is determined in combination with the first cell temperature. Finally, the first cell temperature output by the temperature sensor is corrected according to the determined temperature correction target value. The present application determines whether the cell temperature needs to be corrected through two condition judgment processes, which can effectively identify the situation where the battery module of the hybrid vehicle is seriously affected by heat radiation, and ensure the accuracy of the power battery temperature correction. Among them, the correction scenario condition is used as a prerequisite. When the driving condition of the hybrid vehicle does not meet the correction scenario condition, there is no need to judge the correction start-up condition, which saves computing resources and improves processing efficiency. After identifying the battery cell temperature to be corrected, the temperature correction target value of the first type of battery module that is seriously affected by thermal radiation is determined by the battery cell temperature of other second type battery modules that are not affected by thermal radiation or are not seriously affected, so that the first battery cell temperature output by the temperature sensor is closer to the actual temperature of the battery cell body, further ensuring the accuracy of the power battery temperature correction, and avoiding hybrid vehicles from using inaccurate battery cell temperature for incorrect battery thermal management, affecting the safety of vehicle driving.

[0049] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0051] Figure 1 A schematic diagram of an application scenario provided in an embodiment of the present application;

[0052] Figure 2 A schematic flow chart of a temperature correction method for a power battery provided in an embodiment of the present application;

[0053] Figure 3 A schematic diagram of a process for determining and modifying scene conditions provided in an embodiment of the present application;

[0054] Figure 4A schematic diagram of the cell temperature of a battery module provided in an embodiment of the present application;

[0055] Figure 5 Another schematic flow chart of the method for correcting the temperature of a power battery provided in an embodiment of the present application;

[0056] Figure 6 A schematic structural diagram of a temperature correction device for a power battery provided in an embodiment of the present application;

[0057] Figure 7 A schematic diagram of the structure of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other in any way. In addition, although a logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in an order different from that here.

[0059] To facilitate understanding of the technical solutions provided in the embodiments of the present application, some key terms used in the embodiments of the present application are explained here:

[0060] Battery thermal management: A technology that addresses the effects of temperature on battery performance, combines the battery's electrochemical characteristics with its heat generation mechanism, and, based on the optimal charge and discharge temperature range for a specific battery, solves thermal runaway or thermal dissipation caused by operating at excessively high or low temperatures through rational design, thereby improving overall battery performance. Battery thermal management, at the core of battery energy storage systems, includes technologies such as liquid cooling and phase change materials. During operation, the battery thermal management module constantly monitors the temperature changes of the battery cells using temperature sensors, executes the appropriate battery thermal management strategy based on the current temperature, and controls the charge and discharge process of the battery cells within the optimal temperature range to ensure battery safety.

[0061] Battery Management System (BMS): An on-board device that intelligently manages and maintains each battery cell, prevents overcharging and over-discharging, extends battery life, and monitors battery status. It is used to manage rechargeable batteries in any electronic system, for example, to monitor battery status, calculate and report auxiliary data, control the battery environment, balance battery temperature, and other management functions. It usually includes a management system, a control module, a display module, a wireless communication module, electrical equipment, a battery pack for powering the electrical equipment, and a collection module for collecting battery information from the battery pack.

[0062] Hybrid vehicle: A vehicle that derives its power from at least two different types of onboard stored energy, such as consumable fuel, rechargeable energy, or an energy storage device. Currently, the most common types are those powered by a traditional internal combustion engine, such as a gasoline or diesel engine, generating thermal power, and a power battery and electric motor. These include plug-in hybrid electric vehicles (PHEVs) and hybrid electrical vehicles (HEVs). The use of electric motors in hybrid vehicles allows the powertrain to be flexibly adjusted to the vehicle's actual operating conditions, while maintaining the engine's optimal overall performance range, thereby reducing fuel consumption and emissions.

[0063] Battery module: The battery cell is the smallest energy storage unit of the power battery. Multiple battery cells are encapsulated in the same outer shell frame to form the vehicle's battery module, which is used for overall connection with external parts. All battery modules constitute the vehicle's battery pack, which is jointly managed by the battery management system and the battery thermal management system. Therefore, the power battery is a battery module composed of many battery cells according to a certain rule, and is a whole composed of multiple battery modules.

[0064] The following is a brief introduction to the design concept of the embodiment of this application:

[0065] With the widespread use of new energy vehicles, the safety of their power batteries is one of the most pressing issues in the current development of the new energy vehicle industry. As the smallest energy storage unit in a power battery, the temperature of the battery cell is a significant factor affecting battery safety and performance. During the battery's charging and discharging process, the copper palladium or aluminum palladium on the cell's poles, acting as the electrical medium connecting the cells, will also be subject to current shocks of corresponding magnitude. As the duration of continuous charging and discharging increases, the temperature of the cell and the copper palladium or aluminum palladium will gradually increase, transmitting heat to each other and ultimately reaching a state of thermal equilibrium. Because the temperature of copper palladium or aluminum palladium is closest to the internal temperature of the battery cell in the battery module, the most commonly used temperature acquisition method for current battery thermal management strategies is to attach a temperature sensor to the copper palladium or aluminum palladium of each battery module. This sensor collects the temperature of the copper palladium or aluminum palladium instead of the internal temperature of the battery cell, allowing the temperature changes of the battery cell to be constantly monitored during vehicle operation and used to implement appropriate battery thermal management.

[0066] Hybrid vehicles, a new type of vehicle powered by a gasoline engine and power batteries, typically have their engine exhaust pipes located near the power batteries due to limited interior space. When the hybrid vehicle's engine is running, it generates high-temperature waste heat that needs to be discharged through the exhaust pipe. However, in high-temperature environments, when the engine is running at high power and the vehicle is traveling at a low speed, the high-temperature radiation from the exhaust pipe cannot be promptly carried away by the flowing air. The power battery module adjacent to the exhaust pipe is affected by the thermal radiation, and the copper or aluminum rakes on the battery cell poles are more susceptible to thermal radiation than the battery cell itself. As a result, the copper or aluminum rake temperatures recorded by the temperature sensor no longer accurately reflect the actual battery cell temperature. This causes the vehicle's battery thermal management system to malfunction, significantly impacting vehicle safety.

[0067] In view of the above problems, an embodiment of the present application provides a method for correcting the temperature of a power battery. The method determines whether the current scenario meets the correction scenario conditions of the power battery based on the driving parameters of the hybrid vehicle. The correction start condition of the first type of battery module is determined based on the first cell temperature of the first type of battery module whose degree of influence by the heat radiation of the engine is greater than a preset threshold and the second cell temperature of the second type of battery module other than the first type of battery module output by the temperature sensor. After the correction is turned on, the temperature correction reference value of the first type of battery module is determined based on the second cell temperature. Then, the temperature correction target value of the first type of battery module is determined in combination with the first cell temperature. Finally, the first cell temperature output by the temperature sensor is corrected according to the determined temperature correction target value. The present application determines whether the cell temperature needs to be corrected through two condition judgment processes. It can effectively identify whether the battery module of the hybrid vehicle is in a heat-damaging working condition seriously affected by heat radiation, thereby ensuring the accuracy of the power battery temperature correction. Among them, the correction scenario condition is used as a prerequisite. When the driving condition of the hybrid vehicle does not meet the correction scenario condition, there is no need to judge the correction start condition again, which saves computing resources and improves correction efficiency. After identifying that the battery cell temperature needs to be corrected, the temperature correction target value of the first type of battery module that is seriously affected by thermal radiation is determined by the battery cell temperature of other second type battery modules that are not affected by thermal radiation or are not seriously affected, so that the first battery cell temperature output by the temperature sensor is closer to the actual temperature of the battery cell body, further ensuring the accuracy of the power battery temperature correction, and avoiding hybrid vehicles from using inaccurate battery cell temperature for incorrect battery thermal management, affecting the safety of vehicle driving.

[0068] To further improve the accuracy and efficiency of power battery temperature correction, the present embodiment also provides a power battery correction shutdown condition. When it is determined that the degree to which the first-type battery module is affected by the engine's thermal radiation is no greater than a preset threshold, the temperature correction is promptly disabled. This prevents excessive correction from affecting the accuracy of the battery cell temperature and conserves computing resources. Furthermore, to ensure that the power battery temperature correction process more closely reflects the gradual temperature changes experienced in real-world conditions, the present embodiment adjusts the compensation temperature using a larger first adjustment rate within a preset temperature adjustment strategy during the correction-on process. After the correction is disabled, the compensation temperature is adjusted to zero using a smaller second adjustment rate, thus avoiding sudden increases or decreases in the battery cell temperature.

[0069] The technical solutions provided in the embodiments of this application can be applied to battery thermal management scenarios of power batteries of various hybrid vehicles. Although described as hybrid vehicles, it should be understood that the concepts described herein are not limited to HEV and PHEV, and can be extended to other hybrid vehicles, including but not limited to fuel cell vehicles. Figure 1, which is a structural diagram of a hybrid vehicle provided in an embodiment of the present application, may include a power battery 100 , a temperature sensor 110 , an engine 120 , and a temperature correction device 130 .

[0070] Among them, the power battery 100 is a power supply device composed of multiple battery modules 101, which provides an electric power source for the vehicle. For example, any device that provides a power source for the vehicle, such as lithium power batteries such as lithium metal batteries and lithium ion batteries, lead-acid batteries, hydrogen fuel cells, aluminum air batteries, liquid flow batteries, graphene batteries, etc., can be used, and this embodiment does not make specific limitations.

[0071] The temperature sensor 110 is a sensor that can sense the temperature and changes of various media and convert them into usable output signals, such as a thermistor sensor, a thermocouple sensor, a platinum resistance temperature sensor, a digital output sensor, etc., which can be set on any battery module of the power battery to collect the cell temperature of the battery module in real time and send it to the temperature correction device 130.

[0072] The engine 120 is an energy device that provides a thermal power source, including but not limited to an internal combustion engine such as a gasoline engine or a diesel engine that generates a thermal power source through consumable fuel. In order to discharge the inevitable high-temperature waste heat in the process of generating the thermal power source, the engine has an exhaust system, and due to the space limitations of the vehicle, the exhaust system of the engine is usually arranged around the power battery. The heat radiation generated by the engine will affect the accuracy of the battery cell temperature collected by the temperature sensor on the battery module adjacent to the engine, resulting in the battery cell temperature output by the temperature sensor no longer accurately reflecting the actual temperature of the battery cell, affecting the normal operation of the battery thermal management and the safety of vehicle driving.

[0073] The temperature correction device 130 is a computing device with certain computing capabilities and capable of implementing temperature correction functions. It is the main body of the temperature correction function of the power battery provided in the embodiments of the present application. That is, the temperature correction device 130 can obtain the cell temperature data of each battery module from the temperature sensor and, based on the temperature correction method of the power battery provided in the embodiments of the present application, implement the function of correcting the cell temperature output by the temperature sensor. It should be understood that the computing device provided in the embodiments of the present application can be a device with computing functions such as an on-board terminal device or a server. That is, the temperature correction device 130 can be an on-board terminal device disposed inside the vehicle, that is, the on-board terminal device can independently perform temperature correction based on the temperature sensor data, such as a battery management system (BMS). Alternatively, it can be a server connected to the on-board terminal device, which transmits the cell temperature and other related data obtained by the temperature sensor to the server via a network connection. After the server receives and performs relevant temperature correction processing, it returns the relevant results to the on-board terminal device.

[0074] It should be noted that Figure 1 The figures are only examples. In fact, the number of battery modules and temperature sensors is not limited and is not specifically limited in the embodiments of this application. Figure 1 The components and structures shown are merely exemplary and non-limiting. In actual scenarios, other components and structures may be provided as needed.

[0075] Of course, the method provided in the embodiment of the present application is not limited to Figure 1 The application scenarios shown can also be used in other possible application scenarios, and the embodiments of the present application are not limited thereto. Figure 1 The functions that can be implemented by each device in the application scenario shown will be described in subsequent method embodiments and will not be described in detail here.

[0076] The following describes the temperature correction method of the power battery provided by the exemplary embodiment of the present application in combination with the application scenarios described above and with reference to the accompanying drawings. It should be noted that the above application scenarios are only shown to facilitate understanding of the spirit and principles of the present application, and the implementation of the present application is not limited in this respect.

[0077] See also Figure 2 FIG. 1 is a flow chart of a method for correcting the temperature of a power battery according to an embodiment of the present application. Here, a temperature correction device is used as an example for illustration. The specific implementation process of the method is as follows:

[0078] Step 201: Based on the driving parameters of the hybrid vehicle, determine whether the correction scenario conditions of the power battery are met. If so, jump to step 202; if not, end.

[0079] In an embodiment of the present application, before correcting the power battery, the temperature correction device needs to judge whether the current operating condition of the vehicle meets the pre-set power battery correction scenario conditions based on the current driving parameters of the hybrid vehicle, so as to determine whether to perform the subsequent temperature correction process.

[0080] In one possible embodiment, the hybrid vehicle's driving parameters may be its speed and engine power. The correction scenario conditions indicate that only when the hybrid vehicle is traveling at a preset speed and engine power will the power battery be significantly affected by engine heat radiation, causing the cell temperature output by the temperature sensor to no longer accurately represent the actual cell temperature. For example, through actual scenario testing and relevant data analysis, when the vehicle is operating at high engine power and low speed—for example, when the average engine power is greater than 60 kilowatts and the average speed is less than 40 kilometers per hour over a rolling 20-minute period—the high temperature radiation generated by the engine exhaust pipe will affect the accuracy of the cell temperature recorded by the temperature sensor near the engine exhaust pipe within the power battery. However, if the vehicle's speed increases, the air flow within the battery increases, and the high temperature radiation is promptly carried away by the flowing air, no longer significantly affecting the cell temperature. Alternatively, if the engine power decreases, eliminating the excessive heat radiation, the cell temperature error recorded by the temperature sensor falls within a normal range, no longer affecting the normal operation of battery thermal management, and no computing resources are required to perform temperature correction.

[0081] In one possible implementation, after obtaining relevant driving parameters of the vehicle at the current moment, the temperature correction device may extract a first speed characteristic value and a first power characteristic value corresponding to the first time period based on the driving speed and power values ​​within a first preset time period from the current moment. The device then determines whether the correction scenario conditions are met by determining whether the first speed characteristic value is less than a first speed characteristic threshold and whether the power characteristic value is greater than a preset power characteristic threshold. Only then can the subsequent correction activation condition determination process be determined. If the first speed characteristic value is less than the first speed characteristic threshold and the power characteristic value is greater than the preset power characteristic threshold, indicating that the current driving scenario is low speed and high power, the correction scenario conditions are determined to be met.

[0082] Specifically, the temperature correction device can calculate the average speed and average power corresponding to the time period based on multiple instantaneous driving speeds and instantaneous powers in the first time period, and use the average speed and average power as the speed characteristic value and power characteristic value respectively.

[0083] See also Figure 3 As shown, the temperature correction device constantly obtains the current vehicle's driving parameters to determine whether they meet the correction scenario conditions. Once the driving parameters meet the preset conditions, the subsequent temperature correction process can be carried out. If the vehicle's driving parameters do not meet the correction scenario conditions, the current power battery cell temperature output by the temperature sensor is normal. The cell temperature output by the sensor can be directly used for battery thermal management without the need for temperature correction.

[0084] Specifically, the temperature correction device can be connected to the vehicle's relevant control systems via a Controller Area Network (CAN) bus to obtain required driving parameters. For example, the vehicle's engine power value at a specific moment can be obtained from the engine controller (ECU), and the vehicle's driving speed at a specific moment can be obtained from the electric power steering system (EPS) or the vehicle speed or wheel speed sensor.

[0085] Step 202: Based on the first cell temperature of the first type battery module and the second cell temperature of the second type battery module output by the temperature sensor, determine whether the correction start-up condition of the first type battery module is met. If so, jump to step 203; if not, end.

[0086] In an embodiment of the present application, after determining that the pre-set correction scenario conditions of the power battery are met, the temperature correction device also needs to obtain the cell temperature of each battery module on the power battery from the temperature sensor, including the first cell temperature of the first type of battery module whose degree of influence by the engine's thermal radiation is greater than the preset threshold, and the second cell temperature of the second type of battery module other than the first type of battery module, and judge whether the pre-set correction start conditions are met to determine whether to perform temperature correction on the first type of battery module.

[0087] In one possible embodiment, the first type of battery modules and the second type of battery modules of the power battery include multiple first battery modules and multiple second battery modules, respectively. A temperature correction device may determine a current operating temperature characteristic value of the power battery based on the current first cell temperature of each first battery module and the current second cell temperature of each second battery module. For example, within a cell temperature set consisting of the current first cell temperature of each first battery module and the current second cell temperature of each second battery module, the highest cell temperature in the cell temperature set may be compared to determine the current operating temperature characteristic value of the power battery. A current temperature correction threshold value of the power battery may then be determined based solely on the second cell temperature of each second battery module. For example, the highest second cell temperature may be determined as the temperature correction threshold value by comparing the second cell temperatures of each second battery module. In this case, the temperature correction device determines that the current operating condition of the first type of battery modules of the power battery meets the temperature correction condition if the current operating temperature characteristic value is not greater than a preset operating temperature upper limit and the cell temperatures of all first battery modules are not less than the temperature correction threshold value. Among them, the pre-set upper limit of the operating temperature represents the maximum temperature value at which the battery cell can work normally, and can be set according to different vehicle models, power batteries, driving conditions, etc. When the temperature correction device determines that the highest battery cell temperature among all battery modules is not greater than the upper limit of the operating temperature, it can be determined that the battery cell temperature of all battery modules at the current moment can ensure the normal operation of the battery cell. At the same time, when the battery cell temperature of all first battery modules is not less than the temperature correction critical value, it indicates that the temperature of all first battery modules is higher than that of all second battery modules that are not affected by heat radiation. It can be determined that the first battery module is affected by heat radiation at the current moment, and the abnormal increase in the temperature of the first battery cell requires temperature correction.

[0088] For example, if the power battery includes four battery modules numbered 1-4, battery modules 1-2, located near the engine exhaust pipe, are the first two battery modules of the first category, while battery modules 3-4 are the second battery modules of the second category. After the temperature sensor detects that the first cell temperatures of battery modules 1-2 are 50°C and 52°C, and the second cell temperatures of battery modules 3-4 are 40°C and 38°C, respectively, the temperature correction device can determine the maximum of the four cell temperatures, 52°C, as the current operating temperature characteristic value of the power battery, and the maximum of the two second cell temperatures, 40°C, as the current temperature correction threshold value of the power battery. At this point, since the 50°C operating temperature characteristic value is lower than the preset upper limit of 60°C, and the first cell temperatures of battery modules 1-2 are both greater than the 40°C temperature correction threshold value, the temperature correction device determines that battery modules 1-2 require temperature correction at the current moment.

[0089] In one possible implementation, Figure 4 As shown, the cell temperature of each battery module includes the cell edge temperature T b and the middle temperature of the cell T z , where the cell edge temperature represents the temperature analog signal of the cell edge position detected by the sensor, and the cell middle temperature represents the temperature analog signal of the cell middle position detected by the sensor. Since the engine exhaust pipe is usually arranged around the power battery, the cell edge position of each battery module is more affected by the heat radiation of the engine exhaust pipe than the cell middle position, and in actual circumstances, the cell edge temperature is usually higher than the cell middle temperature. Therefore, when the temperature correction device judges the correction start-up conditions, it can determine that the first type of battery module meets the temperature correction conditions at the current moment by judging that the cell edge temperature of each first battery module is not less than the temperature correction critical value.

[0090] Step 203: Determine a temperature correction reference value of the first type of battery module based on the second battery cell temperature.

[0091] In this embodiment of the present application, the temperature correction device begins temperature correction for the first type of battery module after determining that the pre-set correction scenario conditions and correction activation conditions are met. First, a temperature correction reference value for the first type of battery module is determined based on the second cell temperature of each second battery module. The temperature correction reference value represents the reference value of the cell temperature of the first battery module when it is not affected by thermal radiation.

[0092] In one possible embodiment, after determining to perform temperature correction on the first type of battery module, the temperature correction device can obtain the latest battery cell temperature from the temperature sensor in real time. The temperature value of each battery cell used in the correction process is the latest battery cell temperature value collected in real time by the temperature sensor.

[0093] In a possible implementation, after the temperature correction device determines to perform temperature correction on the first type of battery module, the temperature values ​​of each battery cell used in the correction process may be the temperature values ​​of each battery cell of each battery module received at the start of the correction.

[0094] In one possible embodiment, since the edge of each battery cell of each battery module is more affected by the heat radiation from the engine exhaust pipe than the center of the battery cell, it is generally considered to correct the edge temperature of the battery cell of the first battery module. The temperature correction device can determine the median or average of the battery cell temperature set composed of the center temperatures of the battery cells of each second battery module that is not affected by heat radiation as a temperature correction reference value, representing the reference value of the center temperature of the battery cell of the first battery module when it is not affected by heat radiation. The use of the median can avoid the influence of the maximum and minimum extreme values ​​and better reflect the central trend of the battery cell temperature set.

[0095] Step 204: Determine a temperature correction target value for the first type of battery module based on the temperature correction reference value and the first battery cell temperature.

[0096] In an embodiment of the present application, after determining the temperature correction reference value of the first type of battery module, the temperature correction device also needs to determine the temperature correction target value of the first type of battery module in combination with the first battery cell temperature of each first battery module, so as to correct the first battery cell temperature output by the temperature sensor.

[0097] In one possible implementation, because the unknown temperature at the edge of the first battery module is necessarily higher than the temperature in the middle of the cell, an unavoidable temperature difference exists between the two. The temperature correction device needs to determine a first difference between the edge and middle temperatures of each first battery module's first cell temperature, and then determine a corresponding temperature correction target value for each first battery module in combination with a temperature correction reference value.

[0098] In one possible embodiment, when correcting the edge temperature of a first battery module, the temperature correction device may calculate the difference between the edge temperature and the center temperature of the first battery module, use the absolute value of half of the difference as the first difference, and then use the sum of the first difference and the temperature correction reference value as the temperature correction target value corresponding to the first battery module. Specifically, the temperature correction device may determine the temperature correction target value corresponding to each first battery module using a preset thermal damage algorithm, as shown below:

[0099] T after =|(T b -T Z ) / 2|+T zz

[0100] Among them, T after is the temperature correction target value of the cell edge temperature of the first battery module, T b is the cell edge temperature of the first battery module, T Z is the middle temperature of the battery cell of the first battery module, and Tzz is the temperature correction reference value.

[0101] Step 205 : Correcting the first battery cell temperature output by the temperature sensor based on the temperature correction target value.

[0102] In an embodiment of the present application, after determining the temperature correction target value corresponding to the first battery cell temperature, the temperature correction device will correct the first battery cell temperature output by the temperature sensor according to a pre-set temperature adjustment strategy, and then use the corrected first battery cell temperature as the actual battery cell temperature for battery thermal management of the power battery.

[0103] In one possible embodiment, when correcting the first cell temperature of each first battery module, the temperature correction device may calculate a second difference between the first cell temperature and a target temperature correction value, then adjust the temperature compensation value of the temperature sensor according to a first adjustment rate in a preset temperature adjustment strategy until the temperature compensation value is adjusted to the second difference. Finally, the sum of the first cell temperature and the temperature compensation value is determined as the actual cell temperature for battery thermal management of the first type of battery module. For example, if the first cell temperature to be corrected is 50°C and its target temperature correction value has been calculated as 40°C using a thermal damage algorithm, the temperature correction device may calculate the second difference as -10°C and gradually increase the temperature compensation value of the temperature sensor from zero to -10°C at a preset adjustment rate of 5°C per minute. Finally, the sum of the first cell temperature of 50°C and the temperature compensation value of -10°C is calculated and output as 40°C, i.e., the actual cell temperature for battery thermal management of the first type of battery module is 40°C.

[0104] In one possible implementation, the vehicle's battery management system can receive and process real-time cell temperature data from each battery module in the power battery. When the cell temperature of a battery module rises to a preset warning value in the battery management system, the battery management system issues a battery thermal management activation command, and the battery thermal management module cools the battery module by activating fans or cooling water channels. Similarly, when the cell temperature is too low, the battery management system activates the battery heating device to heat the cell, ensuring that the power battery's charging and discharging operations remain within the optimal operating temperature range, ensuring vehicle safety.

[0105] In a possible implementation, in order to further improve the accuracy and efficiency of the power battery temperature correction, a correction shut-off condition may be set during the power battery temperature correction process to terminate the correction. Figure 5 FIG. 1 is another flow chart of a method for correcting the temperature of a power battery provided by an embodiment of the present application. The specific implementation process of the method is as follows:

[0106] Step 501 : Based on a temperature correction target value, correct the first battery cell temperature output by a temperature sensor.

[0107] The process of step 501 is the same as the process of 205 above, so please refer to the above introduction and will not be repeated here.

[0108] Step 502: Determine whether the degree to which the first type of battery module is affected by the heat radiation of the engine is not greater than a preset threshold, thereby determining whether the power battery's modified shutdown condition is met. If so, jump to step 503; if not, end.

[0109] In an embodiment of the present application, after the temperature correction device starts to perform temperature correction on the first type of battery module, it can determine that the correction shutdown conditions of the power battery are met by determining that the first type of battery module is not affected by the engine heat radiation exceeding the preset threshold at the current moment, thereby ending the temperature correction.

[0110] In one possible implementation, the temperature correction device can comprehensively determine whether the first type of battery module is affected by engine heat radiation exceeding a preset threshold at the current moment based on relevant parameters such as the vehicle's current driving parameters, battery cell temperature, and temperature correction time.

[0111] Specifically, when the temperature correction device determines that the relevant parameters of the vehicle at the current moment meet any one of the following conditions, it can be determined that the degree to which the first type of battery module is affected by the heat radiation of the engine is not greater than a preset threshold:

[0112] (1) The second speed characteristic value corresponding to the second time period of the second preset time length from the current moment is not less than the second speed characteristic threshold.

[0113] Specifically, at higher speeds, the heat radiation generated by the engine of a hybrid vehicle is promptly carried away by the flowing air. At this point, the first-type battery module is no longer affected by engine heat radiation exceeding a preset threshold, eliminating the need for temperature correction of its cell temperature. Therefore, the temperature correction device can obtain multiple instantaneous driving speeds from the EPS, vehicle speed, or wheel speed sensors within a certain time period from the current moment, calculate the average speed corresponding to this time period, and use this speed characteristic value as the speed characteristic value. By determining whether this speed characteristic value is no less than a pre-set second speed characteristic threshold, it can determine whether the vehicle is traveling at a higher speed, for example, if the vehicle's average speed is no less than 70 kilometers per hour over a rolling 30-minute period.

[0114] (2) The operating temperature characteristic value of the power battery is greater than the upper limit of the operating temperature.

[0115] Specifically, since the upper limit of the operating temperature represents the maximum temperature value at which the power battery cell can operate normally, when the operating temperature characteristic value of the power battery exceeds the upper limit of the operating temperature, it indicates that the power battery cell is already in an abnormal operating state such as thermal runaway. If the temperature of the battery cell is continued to be corrected at this time, the battery thermal management may be affected by the corrected battery cell temperature, and relevant processing cannot be performed in time for abnormal battery cell temperature conditions such as thermal runaway.

[0116] (3) When the duration of the temperature correction of the first type of battery module is not less than the preset duration threshold, and the correction scene condition and the correction start condition are not met.

[0117] Specifically, to conserve computing resources and improve correction efficiency, the temperature correction device can be set to cease corrections for the first type of battery module after the temperature correction duration exceeds a preset threshold. However, if the temperature correction device determines, based on the vehicle's relevant parameters, that the correction scenario conditions and correction activation conditions are still met, it will continue to correct the cell temperature of the first type of battery module, ensuring that the cell temperature output by the temperature sensor is close to the actual cell temperature, allowing the vehicle to correctly implement the corresponding battery thermal management strategy.

[0118] Step 503: Adjust the temperature compensation value based on a second adjustment rate in a preset temperature adjustment strategy.

[0119] In an embodiment of the present application, after the temperature correction device determines that the temperature correction of the battery cell temperature has ended, in order to make the change in the battery cell temperature more consistent with the actual temperature change, that is, the temperature change is gradual and cannot rise or fall suddenly, the temperature compensation value can be reduced at a second adjustment rate that is smaller than the first adjustment rate. For example, in the process of adjusting the compensated temperature to the target value at a rate of 5°C per minute, if the temperature correction device determines that the relevant parameters of the vehicle at the current moment meet the correction shutdown conditions, it will stop the correction and gradually reduce the current compensated temperature value to zero at a rate of 1°C per minute.

[0120] Step 504: Determine the sum of the first battery cell temperature and the temperature compensation value as the actual battery cell temperature; or determine the first battery cell temperature as the actual battery cell temperature.

[0121] In an embodiment of the present application, when the temperature correction device determines that the temperature correction needs to be turned off during the temperature correction process, the sum of the first battery cell temperature and the temperature compensation value at the current moment can be determined as the actual battery cell temperature, or the first battery cell temperature output by the temperature sensor at the current moment can be directly determined as the actual battery cell temperature, which is used to perform battery thermal management on the first type of battery module.

[0122] In one possible embodiment, the temperature values ​​of each battery cell used by the temperature correction device during the correction process may be the battery cell temperature values ​​collected in real time by the temperature sensor at the latest moment. Therefore, when the temperature correction device determines to stop temperature correction, the latest first battery cell temperature at the current moment can be directly determined as the actual battery cell temperature.

[0123] In one possible embodiment, the temperature values ​​of each battery cell used by the temperature correction device during the correction process may be the battery cell temperature values ​​of each battery module received at the start of the correction. Therefore, when the temperature correction device determines to stop the temperature correction, the sum of the first battery cell temperature value received at the start of the correction and the temperature compensation value at the current moment may be determined as the actual battery cell temperature.

[0124] Step 505: Determine whether the temperature compensation value is equal to zero; if so, end; if not, jump to step 503.

[0125] In the embodiment of the present application, the temperature correction device reduces the temperature compensation value at a smaller second adjustment rate, gradually decreasing the temperature compensation value to zero to terminate the temperature correction process. For example, when the temperature correction device determines to terminate the temperature correction process, if the temperature compensation value at that time is -10°C, at an adjustment rate of 1°C per minute, it will take 10 minutes to reduce the currently compensated temperature value to zero.

[0126] See Figure 6 Based on the same inventive concept, an embodiment of the present application further provides a power battery temperature correction device 60 for use in a hybrid vehicle. The hybrid vehicle includes a power battery and an engine. The power battery includes a first type of battery module whose degree of influence by the heat radiation of the engine is greater than a preset threshold, and a second type of battery module other than the first type of battery module. The device includes:

[0127] A scenario determination unit 601 is configured to determine, based on the driving parameters of the hybrid vehicle, a correction scenario condition that satisfies the power battery;

[0128] A correction start unit 602 is configured to determine whether a correction start condition of the first type of battery module is satisfied based on a first cell temperature of the first type of battery module and a second cell temperature of the second type of battery module output by a temperature sensor;

[0129] a parameter determination unit 603, configured to determine a temperature correction reference value of the first type of battery module based on the second battery cell temperature;

[0130] A target determination unit 604 determines a temperature correction target value for the first type of battery module based on the temperature correction reference value and the first battery cell temperature;

[0131] The temperature correction unit 605 is configured to correct the first battery cell temperature output by the temperature sensor based on a temperature correction target value.

[0132] Optionally, the driving parameters include driving speed and engine power value, and the scene determination unit 601 is specifically configured to:

[0133] Extracting a first speed characteristic value and a power characteristic value corresponding to the first time period based on the driving speed and power values ​​within a first time period of a first preset time length from the current moment;

[0134] If the first speed characteristic value is less than the first speed characteristic threshold, and the power characteristic value is greater than the preset power characteristic threshold, it is determined that the correction scenario condition is met.

[0135] Optionally, the first type of battery module includes at least one first battery module, and the second type of battery module includes at least one second battery module, and the opening unit 602 is modified to be specifically configured to:

[0136] determining an operating temperature characteristic value of the power battery based on a first battery cell temperature of each first battery module and a second battery cell temperature of each second battery module;

[0137] determining a temperature correction threshold based on the temperature of the second battery cell of each second battery module;

[0138] When the operating temperature characteristic value is not greater than the operating temperature upper limit value, and the battery cell temperature of any first battery module is not less than the temperature correction critical value, it is determined that the temperature correction condition is met.

[0139] Optionally, the cell temperature of each battery module includes the cell edge temperature and the cell middle temperature, and the correction start unit 602 is specifically used to:

[0140] When the operating temperature characteristic value is not greater than the operating temperature upper limit value, and the cell edge temperature of any first battery module is not less than the temperature correction critical value, it is determined that the temperature correction condition is met.

[0141] Optionally, the target determination unit 604 is specifically configured to:

[0142] For each of the first battery modules, perform the following operations:

[0143] A temperature correction target value is determined based on a first difference between a cell edge temperature and a cell middle temperature of the first battery module and a temperature correction reference value.

[0144] Optionally, the temperature correction unit 605 is specifically configured to:

[0145] For each first battery module, perform the following operations respectively:

[0146] determining a second difference between the first battery cell temperature and a temperature correction target value;

[0147] Adjusting the temperature compensation value of the temperature sensor based on a first adjustment rate in a preset temperature adjustment strategy until the temperature compensation value is adjusted to a second difference value;

[0148] The sum of the first battery cell temperature and the temperature compensation value is determined as the actual battery cell temperature for battery thermal management of the first type of battery module.

[0149] Optionally, the temperature correction device of the power battery further includes a correction closing unit 606, which is configured to:

[0150] If the degree to which the first type of battery module is affected by the heat radiation of the engine is not greater than a preset threshold, it is determined that the correction shutdown condition of the power battery is met;

[0151] Adjusting the temperature compensation value based on a second adjustment rate in a preset temperature adjustment strategy until the temperature compensation value is adjusted to zero, wherein the second adjustment rate is less than the first adjustment rate;

[0152] Determine the sum of the first battery cell temperature and the temperature compensation value as the actual battery cell temperature; or,

[0153] The first battery cell temperature is determined as the actual battery cell temperature.

[0154] Optionally, the correction closing unit 606 is specifically configured to:

[0155] When any of the following conditions is met, it is determined that the degree to which the first type of battery module is affected by the heat radiation of the engine is not greater than a preset threshold:

[0156] A second speed characteristic value corresponding to a second time period of a second preset length from the current moment is not less than a second speed characteristic threshold;

[0157] The operating temperature characteristic value of the power battery is greater than the upper limit of the operating temperature;

[0158] When the duration of the temperature correction of the first type of battery module is not less than the preset duration threshold, and the correction scene condition and the correction start condition are not met.

[0159] The above-described device determines, based on the driving parameters of the hybrid vehicle, that the current scenario satisfies the correction scenario conditions for the power battery. Based on the first cell temperature of the first type of battery module whose degree of influence from the engine's heat radiation exceeds a preset threshold, as output by the temperature sensor, and the second cell temperature of the second type of battery module other than the first type of battery module, the correction activation conditions for the first type of battery module are determined to be satisfied. After the correction is activated, a temperature correction reference value for the first type of battery module is determined based on the second cell temperature. This is then combined with the first cell temperature to determine a temperature correction target value for the first type of battery module. Finally, the first cell temperature output by the temperature sensor is corrected based on the determined temperature correction target value.

[0160] For the convenience of description, the above sections are divided into unit modules (or modules) according to their functions and described separately. Of course, when implementing this application, the functions of each unit (or module) can be implemented in the same or multiple software or hardware. The device can be used to execute the methods shown in the embodiments of this application. Therefore, for the functions that can be implemented by each functional module of the device, please refer to the description of the aforementioned embodiments, and no further details will be given.

[0161] See Figure 7 Based on the same technical concept, the present application also provides a computer device. In one embodiment, the computer device may include a memory 701, a communication module 703, and one or more processors 702 as shown in the figure.

[0162] The memory 701 is used to store computer programs executed by the processor 702. The memory 701 may mainly include a program storage area and a data storage area. The program storage area may store an operating system; the data storage area may store various operating instruction sets.

[0163] Memory 701 may be a volatile memory, such as random-access memory (RAM); a non-volatile memory, such as read-only memory, flash memory, a hard disk drive (HDD), or a solid-state drive (SSD); or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited thereto. Memory 701 may be a combination of the above memories.

[0164] The processor 702 may include one or more central processing units (CPUs) or digital processing units, etc. The processor 702 is configured to implement the above-mentioned power battery temperature correction method when calling the computer program stored in the memory 701 .

[0165] The communication module 703 is used to communicate with a message processing device or other network devices.

[0166] The specific connection medium between the memory 701, the communication module 703 and the processor 702 is not limited in the embodiment of the present application. Figure 7 In the embodiment, the memory 701 and the processor 702 are connected via a bus 704. Figure 7 The connections between the other components are shown in bold lines, which are only for illustration and are not intended to be limiting. The bus 704 can be divided into an address bus, a data bus, a control bus, etc. For ease of description, Figure 7 The diagram shows a single thick line, but this does not indicate that there is only one bus or one type of bus.

[0167] The memory 701 stores a computer storage medium, which stores computer-executable instructions for implementing the temperature correction method for the power battery of the embodiment of the present application. The processor 702 is used to execute the temperature correction method for the power battery of each embodiment described above.

[0168] Based on the same inventive concept, an embodiment of the present application further provides a storage medium on which a computer program is stored. When the computer program instructions are executed on a computer, the computer processor executes the steps of the temperature correction method for a power battery according to various embodiments of the present application described above in this specification.

[0169] In some possible embodiments, various aspects of the temperature correction method for a power battery provided in the present application may also be implemented in the form of a program product, which includes program code. When the program product is run on a computer device, the program code is used to enable the computer device to execute the steps of the temperature correction method for a power battery according to various exemplary embodiments of the present application described above in this specification. For example, the computer device may execute the steps of each embodiment.

[0170] The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or component, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0171] The program product of the embodiment of the present application may be a portable compact disc read-only memory (CD-ROM) and include program code, and can be run on a computing device. However, the program product of the present application is not limited thereto. In the present application, a readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with a command execution system, device, or apparatus.

[0172] A readable signal medium may include a data signal transmitted in baseband or as part of a carrier wave, which carries readable program code. Such a transmitted data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium that can transmit, propagate, or transfer a program for use by or in conjunction with a command execution system, apparatus, or device.

[0173] The program code embodied on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0174] The program code for performing the operations of the present application can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and also conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user equipment, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device can be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computing device (for example, using an Internet service provider to connect via the Internet).

[0175] It should be noted that although several units or subunits of the device are mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, depending on the embodiment of the application, the features and functions of two or more units described above can be embodied in a single unit. Conversely, the features and functions of a single unit described above can be further divided and embodied by multiple units.

[0176] Furthermore, although the operations of the method of the present application are described in a particular order in the accompanying drawings, this does not require or imply that the operations must be performed in this particular order, or that all illustrated operations must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0177] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0178] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0179] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A method for correcting the temperature of a power battery, characterized in that: Applied to a hybrid vehicle, the hybrid vehicle includes a power battery and an engine, the power battery includes a first type of battery module whose degree of influence by heat radiation from the engine is greater than a preset threshold and a second type of battery module other than the first type of battery module, the method comprising: determining, based on driving parameters of the hybrid vehicle, a correction scenario condition satisfying the power battery; determining, based on a first cell temperature of the first type of battery module and a second cell temperature of the second type of battery module output by a temperature sensor, whether a correction start-up condition of the first type of battery module is satisfied; Determining a temperature correction reference value of the first type of battery module based on the second battery core temperature; Determining a temperature correction target value for the first type of battery module based on the temperature correction reference value and the first battery cell temperature; Based on the temperature correction target value, the first battery cell temperature output by the temperature sensor is corrected.

2. The method according to claim 1, wherein The driving parameters include a driving speed and a power value of the engine. Then, determining the correction scenario condition satisfying the power battery based on the driving parameters of the hybrid vehicle includes: Extracting a first speed characteristic value and a power characteristic value corresponding to a first time period based on the driving speed and the power value within a first time period of a first preset length from a current moment; If the first speed characteristic value is less than a first speed characteristic threshold, and the power characteristic value is greater than a preset power characteristic threshold, it is determined that the correction scenario condition is met.

3. The method according to claim 1, wherein The first type of battery module includes at least one first battery module, and the second type of battery module includes at least one second battery module. Then, determining that a modified start-up condition of the first type of battery module is satisfied based on a first battery cell temperature of the first type of battery module and a second battery cell temperature of the second type of battery module output by a temperature sensor includes: Determining an operating temperature characteristic value of the power battery based on a first battery cell temperature of each first battery module and a second battery cell temperature of each second battery module; determining a temperature correction critical value based on the second battery cell temperature of each second battery module; When the operating temperature characteristic value is not greater than the operating temperature upper limit value, and the battery cell temperature of any first battery module is not less than the temperature correction critical value, it is determined that the temperature correction condition is met.

4. The method according to claim 3, wherein The cell temperature of each battery module includes a cell edge temperature and a cell middle temperature. When the operating temperature characteristic value is not greater than the operating temperature upper limit, and the cell temperature of any first battery module is not less than the temperature correction critical value, determining that the temperature correction condition is met includes: When the operating temperature characteristic value is not greater than the operating temperature upper limit value, and the cell edge temperature of any one of the first battery modules is not less than the temperature correction critical value, it is determined that the temperature correction condition is met.

5. The method according to claim 4, wherein The determining, based on the temperature correction reference value and the first battery cell temperature, a temperature correction target value of the first type of battery module includes: For each of the first battery modules, perform the following operations: The temperature correction target value is determined based on a first difference between a cell edge temperature and a cell middle temperature of the first battery module and the temperature correction reference value.

6. The method according to claim 3, wherein The correcting the first battery cell temperature output by the temperature sensor based on the temperature correction target value includes: For each of the first battery modules, perform the following operations respectively: determining a second difference between the first battery cell temperature and the temperature correction target value; Adjusting the temperature compensation value of the temperature sensor based on a first adjustment rate in a preset temperature adjustment strategy until the temperature compensation value is adjusted to the second difference; The sum of the first battery cell temperature and the temperature compensation value is determined as the actual battery cell temperature for battery thermal management of the first type of battery module.

7. The method according to claim 6, wherein After determining that the correction start-up condition of the first type of battery module is satisfied based on the first cell temperature of the first type of battery module and the second cell temperature of the second type of battery module output by the temperature sensor, the method further includes: If the degree to which the first type of battery module is affected by the heat radiation of the engine is not greater than the preset threshold, determining that the modified shutdown condition of the power battery is met; Adjusting the temperature compensation value based on a second adjustment rate in a preset temperature adjustment strategy until the temperature compensation value is adjusted to zero, wherein the second adjustment rate is less than the first adjustment rate; Determine the sum of the first battery cell temperature and the temperature compensation value as the actual battery cell temperature; or, The first battery core temperature is determined as the actual battery core temperature.

8. The method according to claim 7, wherein When any of the following conditions is met, it is determined that the degree to which the first type of battery module is affected by the heat radiation of the engine is not greater than the preset threshold: A second speed characteristic value corresponding to a second time period of a second preset length from the current moment is not less than a second speed characteristic threshold; The operating temperature characteristic value of the power battery is greater than the upper limit of the operating temperature; When the duration of the temperature correction of the first type of battery module is not less than the preset duration threshold, and the correction scenario condition and the correction start condition are not met.

9. A temperature correction device for a power battery, characterized in that: Applied to a hybrid vehicle, the hybrid vehicle comprising a power battery and an engine, the power battery comprising a first type of battery module having a degree of influence from the heat radiation of the engine greater than a preset threshold and a second type of battery module other than the first type of battery module, the device comprising: a scenario determination unit, configured to determine, based on driving parameters of the hybrid vehicle, a correction scenario condition satisfying the power battery; a start-up determination unit, configured to determine whether a modified start-up condition of the first type of battery module is satisfied based on a first cell temperature of the first type of battery module and a second cell temperature of the second type of battery module output by a temperature sensor; a parameter determination unit, configured to determine a temperature correction reference value of the first type of battery module based on the temperature of the second battery core; a target determination unit, configured to determine a temperature correction target value for the first type of battery module based on the temperature correction reference value and the first battery cell temperature; A correction unit is configured to correct the first battery core temperature output by the temperature sensor based on the temperature correction target value.

10. A hybrid vehicle, characterized in that: The system comprises a power battery and an engine, and the temperature correction device for the power battery as claimed in claim 9.

11. A computer device, characterized in that: include: memory for storing computer programs; A processor, configured to implement the steps of the method according to any one of claims 1 to 8 when executing the computer program.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

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