CN115675442A - Temperature correction method, device and equipment for power battery and storage medium - Google Patents

Temperature correction method, device and equipment for power battery and storage medium Download PDF

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Publication number
CN115675442A
CN115675442A CN202211346561.8A CN202211346561A CN115675442A CN 115675442 A CN115675442 A CN 115675442A CN 202211346561 A CN202211346561 A CN 202211346561A CN 115675442 A CN115675442 A CN 115675442A
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temperature
battery
battery module
value
cell
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李俊
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Zhejiang Geely Holding Group Co Ltd
Radar New Energy Vehicle Zhejiang Co Ltd
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Zhejiang Geely Holding Group Co Ltd
Radar New Energy Vehicle Zhejiang Co Ltd
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Priority to CN202211346561.8A priority Critical patent/CN115675442A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

The application provides a temperature correction method, a temperature correction device, equipment and a storage medium of a power battery, relates to the technical field of battery optimization control, and is used for correcting the cell temperature output by a temperature sensor, enabling the cell temperature to be closer to the real cell temperature and guaranteeing the driving safety of a vehicle. The method comprises the steps of determining that a current scene meets a corrected scene condition of a power battery according to driving parameters of the hybrid vehicle, determining a corrected starting condition meeting a first battery module according to a first battery core temperature of a first battery module output by a temperature sensor and affected by engine heat radiation to a degree greater than a preset threshold value and a second battery core temperature of a second battery module except the first battery module, determining a temperature corrected reference value of the first battery module according to the second battery core temperature after correction is started, determining a temperature corrected target value of the first battery module by combining the first battery core temperature, and correcting the first battery core temperature output by the temperature sensor according to the determined temperature corrected target value.

Description

Temperature correction method, device and equipment for power battery and storage medium
Technical Field
The application relates to the technical field of battery optimization control, in particular to a temperature correction method, a temperature correction device, temperature correction equipment and a storage medium of a power battery.
Background
Hybrid vehicle is a novel car by gasoline engine and power Battery collaborative energy supply, compares in traditional internal combustion engine automobile, and energy utilization is higher, and environmental protection more compares in pure Electric vehicles (BEV), and car duration is stronger, and application scope is more extensive.
Due to the limited space inside the vehicle, the engine exhaust pipe of the hybrid vehicle is usually disposed around the power battery. When an engine of a hybrid electric vehicle runs, high-temperature waste heat generated by the engine needs to be discharged through an exhaust pipe, when the engine runs at high power and the vehicle speed of the vehicle is low in a high-temperature environment, high-temperature radiation of the exhaust pipe cannot be taken away by flowing air in time, and a power battery module adjacent to the exhaust pipe is provided.
Disclosure of Invention
In view of the foregoing problems, embodiments of the present application provide a method, an apparatus, a device, and a storage medium for correcting a cell temperature output by a temperature sensor, so that the cell temperature is closer to a true cell temperature, so that a vehicle can perform normal battery thermal management, and vehicle driving safety is guaranteed.
In one aspect, a temperature correction method for a power battery is provided, and is applied to a hybrid vehicle, the hybrid vehicle includes the power battery and an engine, the power battery includes a first type battery module affected by heat radiation of the engine to a degree greater than a preset threshold value, and a second type battery module except the first type battery module, and the method includes:
determining that a correction scene condition of the power battery is met based on the running parameters of the hybrid vehicle;
determining that a correction starting condition of the first type of battery module is met 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;
determining a temperature correction reference value of the first battery module based on the second battery cell temperature;
determining a temperature correction target value of the first battery module based on the temperature correction reference value and the first battery cell temperature;
and correcting the first battery cell temperature output by the temperature sensor based on the temperature correction target value.
In one aspect, a temperature correction device for 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 battery module affected by heat radiation of the engine to a degree greater than a preset threshold value, and a second type battery module except the first type battery module, the device includes:
a scene determination unit for determining a corrected scene condition that satisfies the power battery based on a driving parameter of the hybrid vehicle;
the correction starting unit is used for determining that the correction starting condition of the first battery module is met based on the first battery core temperature of the first battery module and the second battery core temperature of the second battery module, which are output by the temperature sensor;
the parameter determining unit is used for determining a temperature correction reference value of the first battery module based on the second battery core temperature;
the target determining unit is used for determining a temperature correction target value of the first battery module on the basis of the temperature correction reference value and the first battery core temperature;
and the temperature correction unit is used for correcting the first battery cell temperature output by the temperature sensor based on the temperature correction target value.
Optionally, if the driving parameter includes the driving speed and the power value of the engine, the scene determining unit is specifically configured to:
extracting a first speed characteristic value and a power characteristic value corresponding to a first time period based on the running speed and the power value within the first time period which is a first preset time length away from the current time;
and if the first speed characteristic value is smaller than a first speed characteristic threshold value and the power characteristic value is larger than a preset power characteristic threshold value, determining that the condition of correcting the scene is met.
Optionally, the first type of battery module includes at least one first battery module, the second type of battery module includes at least one second battery module, and the correction starting unit is specifically configured to:
determining a working temperature characteristic value of the power battery based on the first cell temperature of each first battery module and the second cell temperature of each second battery module;
determining a temperature correction critical value based on the second cell temperature of each second battery module;
and when the working temperature characteristic value is not greater than the working temperature upper limit value and the cell temperature of any one first battery module is not less than the temperature correction critical value, determining that the temperature correction condition is met.
Optionally, the core temperature of each battery module includes a core edge temperature and a core intermediate temperature, and then the correction opening unit is specifically configured to:
and when the working temperature characteristic value is not greater than the working temperature upper limit value and the cell edge temperature of any one first battery module is not less than the temperature correction critical value, determining that the temperature correction condition is met.
Optionally, the target determining unit is specifically configured to:
for each first battery module in the first battery modules, respectively executing the following operations:
and determining the temperature correction target value based on a first difference value between the edge temperature of the battery cell and the middle temperature of the battery cell of the first battery module and the temperature correction reference value.
Optionally, the temperature correction unit is specifically configured to:
for each first battery module, respectively executing the following operations:
determining a second difference between the first 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 value;
and determining the sum of the first cell temperature and the temperature compensation value as the actual cell temperature for performing battery thermal management on the first type of battery module.
Optionally, the apparatus further includes a modified closing unit, configured to:
if the influence degree of the first type of battery module by the heat radiation of the engine is not greater than the preset threshold value, determining that the corrected closing 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 smaller than the first adjustment rate;
determining a sum between the first cell temperature and the temperature compensation value as the actual cell temperature; alternatively, the first and second liquid crystal display panels may be,
and determining the first cell temperature as the actual cell temperature.
Optionally, the modified closing unit is specifically configured to:
when any one of the following conditions is met, determining that the degree of influence of the first-class battery module on the heat radiation of the engine is not greater than the preset threshold value:
a second speed characteristic value corresponding to a second time period which is a second preset time length away from the current time is not less than a second speed characteristic threshold value;
the working temperature characteristic value of the power battery is greater than the working temperature upper limit value;
and when the duration of temperature correction on the first type of battery module is not less than a preset duration threshold, the correction scene condition and the correction starting condition are not met.
In one aspect, a hybrid vehicle is provided that includes a power battery and an engine, and a temperature correction device of the power battery.
In one aspect, a computer device is provided, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any of the above methods when executing the computer program.
In one aspect, a computer storage medium is provided having computer program instructions stored thereon that, when executed by a processor, implement the steps of any of the methods described above.
The beneficial effects of the embodiment of the application are as follows:
in the embodiment of the application, the current scene is determined to meet the condition of the corrected scene of the power battery according to the driving parameters of the hybrid vehicle, and the condition of the corrected opening of the first-class battery module is determined to be met according to the first cell temperature of the first-class battery module and the second cell temperature of the second-class battery module except the first-class battery module, wherein the first cell temperature of the first-class battery module and the second cell temperature of the second-class battery module are output by the temperature sensor and are influenced by the thermal radiation of the engine to a degree greater than a preset threshold value. After the correction is started, determining a temperature correction reference value of the first battery module according to the second battery core temperature, determining a temperature correction target value of the first battery module by combining the first battery core temperature, and finally correcting the first battery core temperature output by the temperature sensor according to the determined temperature correction target value. This application confirms through twice condition decision process whether electric core temperature need revise, can effectively discern that hybrid vehicle's battery module is in the serious condition of thermal radiation influence, guarantees the accuracy of power battery temperature correction. The correction scene condition is used as a precondition, and the correction starting condition does not need to be judged when the driving condition of the hybrid vehicle does not meet the correction scene condition, so that the computing resource is saved, and the processing efficiency is improved. After the cell temperature is identified to be corrected, the cell temperature of the second type battery module which is not influenced by thermal radiation or is not seriously influenced is determined, the temperature correction target value of the first type battery module which is seriously influenced by thermal radiation is determined, the true temperature of the cell body is closer to the first cell temperature output by the temperature sensor, the accuracy of power battery temperature correction is further ensured, and the problem that the hybrid vehicle is subjected to wrong battery thermal management due to the adoption of the inaccurate cell temperature and the driving safety of the vehicle is influenced is avoided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or related technologies of the present application, the drawings used in the description of the embodiments or related technologies will be briefly introduced below, it is obvious that the drawings in the description below are only the embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application;
fig. 2 is a schematic flowchart of a method for correcting a temperature of a power battery according to an embodiment of the present disclosure;
fig. 3 is a schematic flowchart of a process for determining a corrected scene condition according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a cell temperature of a battery module provided in an embodiment of the present application;
fig. 5 is another schematic flow chart of a method for correcting the temperature of a power battery according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a temperature correction device for a power battery according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the technical solutions in the embodiments of the present application will be described below clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. In the present application, the embodiments and features of the embodiments may be arbitrarily combined with each other without conflict. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
For the convenience of understanding the technical solutions provided by the embodiments of the present application, some key terms used in the embodiments of the present application are explained first:
battery thermal management: the technology is used for solving the problem of heat dissipation or thermal runaway caused by the fact that the battery works under the condition of overhigh or overlow temperature through reasonable design based on the optimal charging and discharging temperature interval of a specific battery by combining the electrochemical characteristic and the heat production mechanism of the battery according to the influence of the temperature on the performance of the battery and improving the overall performance of the battery. The battery thermal management is used as the core of a battery energy storage system and comprises the technologies of liquid cooling, phase change materials and the like, a battery thermal management module monitors the temperature change of a battery core constantly through a temperature sensor in the operation process, a corresponding battery thermal management strategy is executed according to the current temperature, and the charging and discharging process of the battery core is controlled to be in an optimal temperature interval to guarantee the safety of the battery.
Battery Management System (BMS): an on-board device for intelligently managing and maintaining each battery unit, preventing the battery from being overcharged and overdischarged, prolonging the service life of the battery, monitoring the battery state, and managing a rechargeable battery of any electronic system, for example, performing management functions of monitoring the battery state, calculating and reporting auxiliary data, controlling the battery environment, balancing the battery temperature, and the like, generally comprises a management system, a control module, a display module, a wireless communication module, an electrical device, a battery pack for supplying power to the electrical device, an acquisition module for acquiring battery information of the battery pack, and the like.
Hybrid vehicle: a Vehicle capable of obtaining power from at least two different types of on-board stored energy, such as consumable fuel, rechargeable energy, or energy storage devices, is most commonly powered by a thermal power source generated by an internal combustion engine, such as a conventional gasoline or diesel engine, and an electric power source generated by a power battery and an electric motor, including Plug-in Hybrid electric vehicles (PHEVs) and Hybrid Electric Vehicles (HEVs). By using the motor on the hybrid power vehicle, the power system can be flexibly regulated and controlled according to the actual operation condition requirement of the vehicle, and the engine can work in an area with the best comprehensive performance, so that the oil consumption and the emission are reduced.
The battery module: the electric core is power battery's minimum electric energy storage unit, and a plurality of electric cores are packed by same shell frame and are constituteed the battery module of vehicle for carry out whole contact with external part, all battery modules then constitute the battery package of vehicle, manage jointly by battery management system and battery thermal management system, consequently power battery is that numerous electric cores make up into battery module according to certain law, by a whole that a plurality of battery modules constitute.
The following briefly introduces the design concept of the embodiments of the present application:
with the wide use of new energy automobiles, the safety of a power battery of a new energy automobile is one of the most concerned problems in the development process of the new energy automobile industry at present, and the battery cell is used as the minimum electric energy storage unit of the power battery, and the temperature of the battery cell is a great important factor influencing the safety and the performance of the battery. When the battery is charged and discharged, the copper palladium or the aluminum palladium on the battery cell pole column serving as an electric medium connected with the battery cell is impacted by current with corresponding magnitude, and along with the extension of continuous charging and discharging time, the temperatures of the battery cell and the copper palladium or the aluminum palladium can be gradually increased and mutually transferred to finally reach a thermal equilibrium state. 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 common temperature acquisition mode of the current battery heat management strategy is to use a temperature sensor to be pasted on the copper palladium or the aluminum palladium of each battery module, and the temperature inside the battery cell is replaced by acquiring the copper palladium or the aluminum palladium so as to monitor the temperature change of the battery cell at any time in the running process of the automobile and run corresponding battery heat management by using the temperature.
As a new type of automobile powered by a gasoline engine and a power battery, the engine exhaust pipe of a hybrid electric vehicle is usually disposed around the power battery due to limited space inside the automobile. When the engine of the hybrid electric vehicle runs, high-temperature waste heat generated by the engine needs to be discharged through the exhaust pipe, and when the engine runs at high power and the vehicle speed of the vehicle is low in a high-temperature environment, high-temperature radiation of the exhaust pipe cannot be taken away by flowing air in time, and the power battery module adjacent to the exhaust pipe is subjected to thermal radiation interference due to the temperature of the copper rake or the aluminum rake on the battery cell pole column, and compared with the battery cell body, the copper rake or the aluminum rake is subjected to greater thermal radiation interference, so that the temperature of the copper rake or the aluminum rake collected by the temperature sensor does not accurately reflect the true temperature of the battery cell of the power battery module any more, the battery thermal management of the vehicle cannot run normally, and the driving safety of the vehicle is greatly influenced.
In view of the above problem, an embodiment of the present application provides a temperature correction method for a power battery, which determines that a current scene meets a corrected scene condition of the power battery according to a driving parameter of a hybrid vehicle, and determines that a correction start condition of a first-class battery module is met according to a first cell temperature of the first-class battery module and a second cell temperature of a second-class battery module, which is output by a temperature sensor and is affected by heat radiation of an engine to a degree greater than a preset threshold, of the second-class battery module except the first-class battery module. After the correction is started, determining a temperature correction reference value of the first battery module according to the second battery core temperature, determining a temperature correction target value of the first battery module by combining the first battery core temperature, and finally correcting the first battery core temperature output by the temperature sensor according to the determined temperature correction target value. This application confirms through twice condition decision process whether electric core temperature need revise, can effectively discern whether hybrid vehicle's battery module is in under the serious heat evil operating mode of thermal radiation influence, guarantees the accuracy of power battery temperature correction. The correction scene condition is used as a precondition, and the correction starting condition does not need to be judged when the driving condition of the hybrid vehicle does not meet the correction scene condition, so that the calculation resource is saved, and the correction efficiency is improved. This is discerning that the core temperature waits to revise the back, through other not being influenced by the thermal radiation or influencing the core temperature of not serious second type battery module, determine the temperature correction target value of the serious first type battery module of thermal radiation influence, make the true temperature of electric core body is pressed close to more to the first core temperature of temperature sensor output, further guarantee the accuracy of power battery temperature correction, avoid hybrid vehicle to carry out wrong battery thermal management because of adopting inaccurate core temperature, influence the security that the vehicle travel.
In order to further improve the accuracy and the correction efficiency of the power battery temperature correction, the embodiment of the application also sets the correction closing condition of the power battery, and timely closes the temperature correction when the influence degree of the first type of battery module on the heat radiation of the engine is determined to be not more than the preset threshold value, so that the accuracy of the battery core temperature is prevented from being influenced by excessive correction, and the calculation resource is saved. Simultaneously for making power battery's temperature correction process accord with the characteristics of temperature gradual change under the real condition more, this application opens the in-process in the correction, adjusts the compensation temperature through the great first adjustment rate in the temperature adjustment strategy that predetermines, closes the back in the correction, will compensate temperature adjustment to zero through less second adjustment rate, has avoided the sudden rise sudden drop of electric core temperature.
The solution provided by the embodiments of the present application may be applied to battery thermal management scenarios of power batteries of various hybrid vehicles, although depicted as hybrid vehicles, it should be understood that the concepts described herein are not limited to HEVs, PHEVs, but may be extended to other hybrid vehicles, including but not limited to fuel cell vehicles, and the like. As shown in fig. 1, a schematic 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.
The power battery 100 is a power supply device that is composed of a plurality of battery modules 101 and provides an electric power source for the vehicle, and may be any device that provides a power source for the vehicle, such as a lithium power battery, such as a lithium metal battery and a lithium ion battery, a lead-acid battery, a hydrogen fuel battery, an aluminum air battery, a flow battery, and a graphene battery.
The temperature sensor 110 is a sensor capable of sensing the temperature and the change of various media and converting the temperature and the change of various media into a usable output signal, for example, a thermistor sensor, a thermocouple sensor, a platinum thermistor temperature sensor, a digital output sensor, etc. may be optionally installed on each battery module of the power battery, collect the cell temperature of the battery module in real time, and send the cell temperature to the temperature correction device 130.
The engine 120 is an energy device for providing a thermal power source, including but not limited to an internal combustion engine such as a gasoline engine or a diesel engine, which generates the thermal power source by using a consumable fuel, and in order to exhaust 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 limitation of the vehicle, the exhaust system of the engine is usually disposed at the periphery of the power battery, and the heat radiation generated by the engine will affect the accuracy of the cell temperature collected by the temperature sensor on the battery module adjacent to the engine, so that the cell temperature output by the temperature sensor no longer accurately reflects the true temperature of the cell, and the normal operation of battery thermal management and the safety of vehicle driving are affected.
The temperature correction device 130 is a computing device having a certain computing capability and capable of implementing a temperature correction function, and is an execution main body of the temperature correction function of the power battery provided in the embodiment of the present application, that is, the temperature correction device 130 is capable of acquiring cell temperature data of each battery module from a temperature sensor, and implementing a function of correcting a cell temperature output by the temperature sensor based on the temperature correction method of the power battery provided in the embodiment of the present application. It should be understood that the computing device provided in this embodiment of the present application may be a device having a computing function, such as a vehicle-mounted terminal device or a server, that is, the temperature correction device 130 may be a vehicle-mounted terminal device installed inside a vehicle, that is, the vehicle-mounted terminal device may perform temperature correction based on temperature sensor data by itself, for example, the battery management system BMS, or may be a server to which the vehicle-mounted terminal device is connected, the vehicle-mounted terminal device transmits relevant data, such as a cell temperature acquired by a temperature sensor, to the server through a connection network, and the server receives and performs relevant temperature correction processing, and then returns a relevant result to the vehicle-mounted terminal device.
It should be noted that fig. 1 is only an example, and the number of the battery modules and the number of the temperature sensors are not limited in practice, and is not particularly limited in the embodiment of the present application. And the components and configurations shown in fig. 1 are exemplary only, not limiting, and other components and configurations may be present as desired in an actual scenario.
Of course, the method provided in the embodiment of the present application is not limited to be used in the application scenario shown in fig. 1, and may also be used in other possible application scenarios, and the embodiment of the present application is not limited. Functions that can be implemented by each device of the application scenario shown in fig. 1 will be described together in the subsequent method embodiment, and will not be described in detail herein.
The method for correcting the temperature of the power battery provided by the exemplary embodiment of the present application is described below with reference to the accompanying drawings in combination with the application scenarios described above, and it should be noted that the application scenarios described above are only shown for the convenience of understanding the spirit and principle of the present application, and the embodiments of the present application are not limited in this respect.
Referring to fig. 2, a schematic flow chart of a method for correcting the temperature of a power battery provided in an embodiment of the present application is illustrated by taking a temperature correction device as an example, where the method is specifically implemented as follows:
step 201: determining whether a correction scene condition of a power battery is met or not based on the running parameters of the hybrid vehicle, and if so, skipping to execute the step 202; if not, the process is ended.
In the embodiment of the application, before the power battery is corrected, the temperature correction device needs to judge whether the working condition of the vehicle at the current moment meets the preset correction scene condition of the power battery according to the running parameters of the hybrid vehicle at the current moment so as to determine whether to perform the subsequent temperature correction process.
In a possible implementation manner, the driving parameters of the hybrid vehicle may be a driving speed of the hybrid vehicle and a power value of the engine, and at this time, the correction scene condition represents that the battery temperature output by the temperature sensor does not accurately represent the true temperature of the battery cell due to the fact that the power battery may be greatly influenced by heat radiation of the engine when the hybrid vehicle is driven at the preset driving speed and the preset power of the engine. For example, through actual scene testing and related data analysis, when a vehicle is in a working condition that an engine runs at high power and at low speed, for example, within a rolling time of 20 minutes, the average power of the engine is greater than 60 kw, and the average running speed is less than 40 km/h, high-temperature radiation generated by an exhaust pipe of the engine will affect the accuracy of a temperature sensor for acquiring the temperature of a cell inside a power battery, which is adjacent to the exhaust pipe of the engine. And if the running speed of the vehicle is increased, the air fluidity inside the battery is enhanced, high-temperature radiation is taken away by flowing air in time, and the collection of the battery core temperature is not influenced greatly, or the power of an engine is reduced, and overhigh heat radiation is not generated, so that the error of the battery core temperature collected by the temperature sensor is in a normal range, the normal operation of the battery heat management is not influenced, and the temperature is corrected without consuming calculation resources.
In a possible implementation manner, after the temperature correction device obtains the relevant driving parameters of the vehicle at the current time, the temperature correction device may extract a first speed characteristic value and a power characteristic value corresponding to a first time period according to the driving speed and the power value within the first time period which is a first preset time period away from the current time. And determining whether the scene correction condition is met or not by determining whether the first speed characteristic value is smaller than a first speed characteristic threshold or not and whether the power characteristic value is larger than a preset power characteristic threshold or not, so that whether a subsequent judgment process of correcting the starting condition is carried out or not can be determined. And when the first speed characteristic value is smaller than the first speed characteristic threshold value and the power characteristic value is larger than a preset power characteristic threshold value, namely the current driving scene is a low-speed driving and high-power driving scene, determining whether a scene correction condition is met.
Specifically, the temperature correction device may calculate an average speed and an average power corresponding to a first time period according to a plurality of instantaneous traveling speeds and instantaneous powers in the time period, and take the average speed and the average power as a speed characteristic value and a power characteristic value, respectively.
Referring to fig. 3, the temperature correction device always obtains the relevant driving parameters of the vehicle at the current time to determine whether the conditions for correcting the scene are met, and once the driving parameters meet the preset conditions, the subsequent process of temperature correction can be performed. And when the driving parameters of the vehicle do not meet the correction scene conditions, the battery core temperature of the power battery output by the temperature sensor at the current moment is normal, the battery thermal management can be directly carried out by using the battery core temperature output by the sensor, and the temperature correction is not needed.
Specifically, the temperature correction device may be connected to a related control system of the vehicle through a Controller Area Network (CAN) bus to obtain the required driving parameters. The engine Power value of the vehicle at a specific time may be obtained from an Engine Controller (ECU), or the running speed of the vehicle at a specific time may be obtained from an Electric Power Steering (EPS) or a vehicle speed or wheel speed sensor, for example.
Step 202: determining whether a correction starting condition of the first type of battery module is met or not based on a first battery core temperature of the first type of battery module and a second battery core temperature of the second type of battery module output by the temperature sensor, and if so, skipping to execute a step 203; if not, the process is ended.
In this application embodiment, after the temperature correction device determines that the preset correction scene condition of the power battery is satisfied, the temperature sensor is further required to acquire the cell temperature of each battery module on the power battery, including the first cell temperature of the first type of battery module that is affected by the thermal radiation of the engine and is greater than the preset threshold, and the second cell temperature of the second type of battery module except the first type of battery module, and whether the preset correction start condition is satisfied is determined, so as to determine whether to perform the temperature correction for the first type of battery module.
In one possible embodiment, the first type battery module and the second type battery module of the power battery respectively comprise a plurality of first battery modules and a plurality of second battery modules. The temperature correction equipment can jointly determine the working temperature characteristic value of the power battery at the current moment according to the first cell temperature of each first battery module at the current moment and the second cell temperature of each second battery module at the current moment. For example, in a cell temperature set composed of the first cell temperature of each first battery module and the second cell temperature of each second battery module at the current moment, the highest cell temperature is determined as the current-moment operating temperature characteristic value of the power battery by comparing the magnitudes of all the cell temperatures in the cell temperature set. And determining the temperature correction critical value of the power battery at the current moment according to the second cell temperatures of the second battery modules, for example, by comparing the second cell temperatures of the second battery modules, and determining the highest second cell temperature as the temperature correction critical value. Under the above conditions, when the temperature correction device determines that the working temperature characteristic value is not greater than the preset working temperature upper limit value and the cell temperatures of all the first battery modules are not less than the temperature correction critical value, it is determined that the working condition of the first battery module of the power battery at the current moment meets the temperature correction condition. The preset upper limit value of the working temperature represents the maximum temperature value at which the battery core can normally work, and the maximum temperature value can be set according to different vehicle types, power batteries, running conditions and the like. When the temperature correction equipment determines that the highest cell temperature in all the battery modules is not greater than the working temperature upper limit value, the cell temperature of all the battery modules at the current moment can be determined to ensure that the cell can normally work. Simultaneously, when the core temperature of all first battery module was all not less than the temperature correction critical value, the temperature that shows all first battery modules all is higher than not receiving all second battery modules that the heat radiation influences, can confirm that the first battery module receives the heat radiation influence at the present moment, and first core temperature rises unusually and needs carry out the temperature correction.
For example, if the power battery includes 4 battery modules with battery numbers 1-4, the battery modules 1-2 near the engine exhaust pipe are two first battery modules of the first battery module, and the other battery modules 3-4 are the second battery modules of the second battery module. After the temperature correction equipment acquires that the first cell temperatures of the No. 1-2 battery module are respectively 50 ℃ and 52 ℃ and the second cell temperatures of the No. 3-4 battery module are respectively 40 ℃ and 38 ℃, the maximum value 52 ℃ in the 4 cell temperatures can be determined as the working temperature characteristic value of the power battery at the current moment, and the maximum value 40 ℃ in the 2 second cell temperatures is determined as the temperature correction critical value of the power battery at the current moment. At this time, since the characteristic value of the working temperature of 50 ℃ is smaller than the preset upper limit value of the working temperature of 60 ℃ and the first battery core temperatures of the battery modules of numbers 1 to 2 are all larger than the temperature correction critical value of 40 ℃, the temperature correction equipment determines that the battery modules of numbers 1 to 2 need temperature correction at the current moment.
In one possible embodiment, as shown in fig. 4, the cell temperature of each battery module includes a cell edge temperature T b And cell intermediate temperature T z The battery core edge temperature represents a temperature-sensing analog signal of the battery core edge position temperature detected by the sensor, and the battery core middle temperature represents a temperature-sensing analog signal of the battery core middle position temperature detected by the sensor. Because engine exhaust pipe is set up in power battery's periphery usually, consequently the electric core border position of every battery module receives engine exhaust pipe thermal radiation to influence and is compared in electric core intermediate position bigger, and its electric core border temperature all is higher than temperature in the middle of the electric core usually under the true condition. Therefore, when the temperature correction equipment judges the correction starting condition, the temperature of the edge of the battery cell of each first battery module can be judged to be not less than the temperature correction critical value, and the first battery module at the current moment can be determined to meet the temperature requirementAnd (5) degree correction conditions.
Step 203: and determining a temperature correction reference value of the first battery module based on the second battery cell temperature.
In the embodiment of the application, after the temperature correction device determines that the preset correction scene condition and the preset correction starting condition are met, the temperature correction device starts to perform temperature correction on the first type of battery module. Firstly, a temperature correction reference value of the first type of battery module is determined according to the second cell temperature of each second battery module. And the temperature correction reference value represents a reference value of the cell temperature when the first battery module is not influenced by heat radiation.
In a possible implementation manner, after the temperature correction device determines to perform the temperature correction on the first type of battery module, the latest cell temperature can be obtained from the temperature sensor in real time, and each cell temperature value used in the correction process is the latest cell temperature value collected by the temperature sensor in real time.
In a possible implementation manner, after the temperature correction device determines to perform the temperature correction on the first type of battery module, each cell temperature value used in the correction process may be a cell temperature value of each battery module received at the correction start time.
In one possible embodiment, since the cell edge position of each battery module is influenced more than the cell center position by the engine exhaust pipe heat radiation, it is generally considered to correct the cell edge temperature of the first battery module. The temperature correction equipment accessible is in the electric core temperature set that constitutes by the electric core intermediate temperature of each second battery module that does not receive the thermal radiation influence, and it is the temperature correction reference value to determine its median or average number, and the reference value of the electric core intermediate temperature when the first battery module of sign does not receive the thermal radiation influence, and adopts the median can avoid receiving the influence of biggest and minimum extreme value, reflects the concentrated trend of this electric core temperature set more.
Step 204: and determining a temperature correction target value of the first battery module based on the temperature correction reference value and the first battery cell temperature.
In this embodiment of the application, after the temperature correction reference value of the first type of battery module is determined, the temperature correction device needs to determine the temperature correction target value of the first type of battery module by combining the first cell temperatures of the first battery modules, so as to correct the first cell temperature output by the temperature sensor.
In a possible embodiment, because the unknown temperature of the cell edge is necessarily higher than the temperature of the middle position in the real cell temperature of the first battery module, an unavoidable temperature difference exists between the two. The temperature correction equipment needs to determine a first difference value according to the temperature between the electric core edge and the electric core of the first electric core temperature of each first battery module, and the temperature correction target value corresponding to each first battery module is determined respectively according to the temperature correction reference value.
In a possible embodiment, when the cell edge temperature of the first battery module is corrected, the temperature correction device may calculate a difference between the cell edge temperature of the first battery module and a cell intermediate temperature, use an absolute value of one-half of the difference as a first difference, and use a sum of the first difference and a temperature correction reference value as a 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 through a preset heat damage algorithm, where the heat damage algorithm is as follows:
T after ＝|(T b -T Z )/2|+T zz
wherein, T after Correcting a target value, T, for a temperature of a cell edge temperature of a first battery module b Cell edge temperature, T, for the first battery module Z The cell intermediate temperature of the first battery module is referred to as Tzz, which is a temperature correction reference value.
Step 205: and correcting the first battery cell temperature output by the temperature sensor based on the temperature correction target value.
In this embodiment of the application, after determining a temperature correction target value corresponding to the first cell temperature, the temperature correction device corrects the first cell temperature output by the temperature sensor according to a preset temperature adjustment strategy, and then uses the corrected first cell temperature as an actual cell temperature for performing battery thermal management on the power battery.
In a possible embodiment, when the temperature correction device corrects the first cell temperature of each first battery module, the temperature compensation value of the temperature sensor may be adjusted according to a first adjustment rate in a preset temperature adjustment strategy by calculating a second difference between the first cell temperature and a temperature correction target value until the temperature compensation value is adjusted to the second difference, and finally, a sum of the first cell temperature and the temperature compensation value is determined as an actual cell temperature for performing battery thermal management on the first type of battery module. For example, if the first cell temperature to be corrected is 50 ℃ and the temperature correction target value is calculated to be 40 ℃ by the thermal damage algorithm, the temperature correction device may calculate the second difference value to be-10 ℃, gradually increase the temperature compensation value of the temperature sensor from zero to-10 ℃ at a preset adjustment rate of 5 ℃ per minute, and finally calculate and output the sum of the first cell temperature of 50 ℃ and the temperature compensation value of-10 ℃, that is, the actual cell temperature of the first type of battery module for battery thermal management is 40 ℃.
In a possible implementation manner, the vehicle may receive and process the cell temperature data of each battery module in the power battery in real time through the battery management system, when the cell temperature of the battery module rises to a preset warning value of the battery management system, the battery management system issues a battery thermal management starting instruction, and the battery thermal management module cools the battery module by turning on a fan or a cooling water channel. Similarly, when the temperature of the battery core is too low, the battery management system can turn on the battery heating device to heat the battery core, so that the charging and discharging operation of the power battery is kept in an optimal working temperature range, and the running safety of the vehicle is ensured.
In a possible embodiment, in order to further improve the accuracy and correction efficiency of the power battery temperature correction, a correction shutdown condition may be set during the temperature correction of the power battery to terminate the correction. Referring to fig. 5, another schematic flow chart of the method for correcting the temperature of the power battery provided in the embodiment of the present application is shown, and the specific implementation flow of the method is as follows:
step 501: and correcting the first battery cell temperature output by the temperature sensor based on the temperature correction target value.
The process of step 501 is the same as that of step 205, so that reference can be made to the foregoing description, and further description is omitted here.
Step 502: and judging whether the influence degree of the first type of battery module by the heat radiation of the engine is not greater than a preset threshold value or not so as to determine whether the corrected closing condition of the power battery is met or not. If yes, skipping to execute step 503; if not, the process is ended.
In the embodiment of the application, after the temperature correction equipment starts to perform temperature correction on the first-class battery module, the temperature correction equipment can determine that the power battery is satisfied with the correction closing condition by determining that the first-class battery module is not influenced by heat radiation of the engine exceeding a preset threshold at the current moment, so that the temperature correction is finished.
In a possible implementation manner, the temperature correction device can comprehensively judge whether the first-type battery module is influenced by the heat radiation of the engine exceeding a preset threshold value at the current moment through related parameters such as the driving parameter, the cell temperature and the temperature correction time length at the current moment of the vehicle.
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 may be determined that the degree of influence of the heat radiation of the engine on the first-type battery module is not greater than a preset threshold:
(1) And the second speed characteristic value corresponding to a second time period which is a second preset time length away from the current time is not less than the second speed characteristic threshold value.
Specifically, because hybrid vehicle is under higher speed of travel, the heat radiation that the engine produced will in time be taken away by the air that flows, and the first type battery module will no longer receive the engine heat radiation influence that surpasss the default threshold value this moment, need not to carry out temperature correction to its electric core temperature again. The temperature correction apparatus may thus acquire a plurality of instantaneous traveling speeds from the EPS, vehicle speed, or wheel speed sensor over a certain period of time from the present time, calculate an average speed corresponding to the period of time, and use this as the speed feature value. It is determined whether the vehicle is at a higher travel speed, for example, the vehicle has an average speed of not less than 70 km per hour over a 30 minute rolling time, by determining whether the speed characteristic value is not less than a preset second speed characteristic threshold value.
(2) And the working temperature characteristic value of the power battery is greater than the working temperature upper limit value.
Specifically, the upper working temperature limit represents a maximum temperature value at which the electric core of the power battery can normally work, and when the characteristic value of the working temperature of the power battery exceeds the upper working temperature limit, it indicates that the electric core of the power battery is in an abnormal working state such as thermal runaway, and if the temperature of the electric core is continuously corrected at this time, the thermal management of the battery may be affected by the corrected electric core temperature, and the related processing cannot be performed in time on the abnormal conditions of the electric core temperature such as thermal runaway.
(3) When the duration of temperature correction on the first type of battery module is not less than the preset duration threshold, the scene correction condition and the correction starting condition are not met.
Specifically, in order to save the calculation resources and improve the correction efficiency, the temperature correction device may be configured to stop the correction when the temperature correction time for the first type of battery module exceeds a preset time threshold. If the temperature correction equipment judges that the correction scene condition and the correction starting condition are still met according to the relevant parameters of the vehicle, the cell temperature of the first type of battery module is continuously corrected, and the final cell temperature output by the temperature sensor is close to the actual cell temperature, so that the vehicle can correctly run a corresponding battery heat management strategy.
Step 503: and adjusting the temperature compensation value based on a second adjustment rate in a preset temperature adjustment strategy.
In the embodiment of the present application, after the temperature correction device determines to end the temperature correction on the cell temperature, in order to make the change of the cell temperature more conform to the temperature change condition in the actual condition, that is, the temperature change is gradually performed, and it is impossible to suddenly increase or decrease the temperature. The temperature compensation value may be reduced by 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 the rate of 5 ℃ per minute, if the temperature correction device determines that the relevant parameter of the vehicle at the present time satisfies the correction closing condition, the temperature correction device stops the correction, and gradually reduces the temperature value compensated at the present time to zero at the rate of 1 ℃ per minute.
Step 504: determining a sum value between the first cell temperature and the temperature compensation value as an actual cell temperature; alternatively, the first cell temperature is determined as the actual cell temperature.
In the embodiment of the application, when the temperature correction device determines that the temperature correction needs to be closed in the process of performing the temperature correction, the sum of the first cell temperature and the temperature compensation value at the current moment can be determined as the actual cell temperature, and the first cell temperature output by the temperature sensor at the current moment can also be directly determined as the actual cell temperature, so that the first type of battery module is subjected to battery thermal management.
In a possible implementation manner, each cell temperature value used by the temperature correction device in the correction process may be a cell temperature value acquired by the temperature sensor at the latest moment in real time, and therefore, when the temperature correction device determines to stop temperature correction, the latest first cell temperature at the current moment may be directly determined as the actual cell temperature.
In a possible embodiment, each of the cell temperature values used by the temperature correction device in the correction process may be a cell temperature value of each battery module received at a time when the correction starts, and therefore, after the temperature correction device determines to stop the temperature correction, a sum of a first cell temperature value received at the time when the correction starts and a temperature compensation value at the current time may be determined as the actual cell temperature.
Step 505: judging whether the temperature compensation value is equal to zero or not; if yes, the process is ended, otherwise, the step 503 is executed.
In the embodiment of the present application, the temperature correction device decreases the temperature compensation value by a smaller second adjustment rate, so that the temperature compensation value gradually decreases to zero to end the temperature correction process. For example, when the temperature correction device determines to stop the temperature correction process, if the temperature compensation value at this time is-10 ℃, it will take 10 minutes to reduce the temperature value compensated at the current time to zero at an adjustment rate of 1 ℃ per minute.
Referring to fig. 6, based on the same inventive concept, the present application further provides a temperature correction device 60 for a power battery, which is applied to a hybrid vehicle, where the hybrid vehicle includes the power battery and an engine, the power battery includes a first type battery module and a second type battery module, and the degree of influence of heat radiation of the engine is greater than a preset threshold, the device includes:
a scene determination unit 601 configured to determine that a modified scene condition of the power battery is satisfied based on a driving parameter of the hybrid vehicle;
the correction starting unit 602 is configured to determine that a correction starting condition of the first-type battery module is met based on a first cell temperature of the first-type battery module and a second cell temperature of the second-type battery module, which are output by the temperature sensor;
the parameter determining unit 603 is configured to determine a temperature correction reference value of the first battery module based on the second cell temperature;
a target determination unit 604, which determines a temperature correction target value of the first type of battery module based on the temperature correction reference value and the first cell temperature;
a temperature correction unit 605, configured to perform correction processing on the first cell temperature output by the temperature sensor based on the temperature correction target value.
Optionally, if the driving parameter includes a driving speed and a power value of the engine, the scenario determination unit 601 is specifically configured to:
extracting a first speed characteristic value and a power characteristic value corresponding to a first time period based on the running speed and the power value within the first time period which is a first preset time length away from the current time;
and if the first speed characteristic value is smaller than the first speed characteristic threshold value and the power characteristic value is larger than a preset power characteristic threshold value, determining that the condition of correcting the scene is met.
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 then the correction starting unit 602 is specifically configured to:
determining a working temperature characteristic value of the power battery based on the first cell temperature of each first battery module and the second cell temperature of each second battery module;
determining a temperature correction critical value based on the second cell temperature of each second battery module;
and when the working temperature characteristic value is not greater than the working temperature upper limit value and the cell temperature of any one first battery module is not less than the temperature correction critical value, determining that the temperature correction condition is met.
Optionally, the cell temperature of each battery module includes a cell edge temperature and a cell intermediate temperature, and then the start unit 602 is corrected, and is specifically used for:
and when the working temperature characteristic value is not greater than the working temperature upper limit value and the cell edge temperature of any one first battery module is not less than the temperature correction critical value, determining that the temperature correction condition is met.
Optionally, the target determining unit 604 is specifically configured to:
for each first battery module in each first battery module, respectively executing the following operations:
and determining a temperature correction target value based on a first difference value between the edge temperature of the battery cell and the middle temperature of the battery cell of the first battery module and the temperature correction reference value.
Optionally, the temperature correction unit 605 is specifically configured to:
for each first battery module, the following operations are respectively executed:
determining a second difference between the first 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 a second difference value;
and determining the sum of the first cell temperature and the temperature compensation value as the actual cell temperature for carrying out battery thermal management on the first type of battery module.
Optionally, the temperature correction device for power battery further includes a correction shutdown unit 606, configured to:
if the influence degree of the first type of battery module by the heat radiation of the engine is not greater than a preset threshold value, determining that the corrected closing 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 smaller than the first adjustment rate;
determining a sum value between the first cell temperature and the temperature compensation value as an actual cell temperature; alternatively, the first and second electrodes may be,
and determining the first cell temperature as the actual cell temperature.
Optionally, the modified closing unit 606 is specifically configured to:
when any one of the following conditions is met, determining that the influence degree of the first-class battery module by the heat radiation of the engine is not more than a preset threshold value:
a second speed characteristic value corresponding to a second time period which is a second preset time length away from the current time is not less than a second speed characteristic threshold value;
the working temperature characteristic value of the power battery is greater than the working temperature upper limit value;
and when the duration of the temperature correction on the first type of battery module is not less than the preset duration threshold, the correction scene condition and the correction starting condition are not met.
Through the device, the current scene is determined to meet the correction scene condition of the power battery according to the driving parameters of the hybrid vehicle, and the correction starting condition of the first-class battery module is determined to be met according to the first cell temperature of the first-class battery module and the second cell temperature of the second-class battery module except the first-class battery module, wherein the first cell temperature of the first-class battery module and the second cell temperature of the second-class battery module are output by the temperature sensor and are influenced by the heat radiation of the engine to a degree larger than a preset threshold value. After the correction is started, determining a temperature correction reference value of the first battery module according to the second battery core temperature, determining a temperature correction target value of the first battery module by combining the first battery core temperature, and finally correcting the first battery core temperature output by the temperature sensor according to the determined temperature correction target value.
For convenience of description, the above portions are described separately as unit modules (or modules) according to functional division. Of course, the functionality of the various elements (or modules) may be implemented in the same one or more pieces of software or hardware in practicing the present application. The apparatus may be configured to execute the method shown in each embodiment of the present application, and therefore, for functions and the like that can be realized by each functional module of the apparatus, reference may be made to the description of the foregoing embodiment, which is not repeated herein.
Referring to fig. 7, based on the same technical concept, an embodiment of the present application further 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.
A memory 701 for storing computer programs executed by the processor 702. The memory 701 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system; the storage data area may store various operation instruction sets and the like.
The memory 701 may be a volatile memory (volatile memory), such as a random-access memory (RAM); the memory 701 may also be a non-volatile memory (non-volatile memory), such as a read-only memory (rom), a flash memory (flash memory), a hard disk (HDD) or a solid-state drive (SSD); or memory 701 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 701 may be a combination of the above memories.
The processor 702 may include one or more Central Processing Units (CPUs), or be a digital processing unit, etc. The processor 702 is configured to implement the temperature correction method for the power battery when calling the computer program stored in the memory 701.
The communication module 703 is used for communicating with a message processing device or other network devices.
The embodiment of the present application does not limit the specific connection medium among the memory 701, the communication module 703 and the processor 702. In fig. 7, the memory 701 and the processor 702 are connected by a bus 704, the bus 704 is depicted by a thick line in fig. 7, and the connection manner between other components is merely illustrative and not limited. The bus 704 may be divided into an address bus, a data bus, a control bus, and the like. For ease of description, only one thick line is depicted in fig. 7, but not only one bus or one type of bus.
The memory 701 stores therein a computer storage medium, and the computer storage medium stores therein computer-executable instructions for implementing the temperature correction method for a power battery according to the embodiment of the present application. The processor 702 is configured to execute the temperature correction method of the power battery according to the above embodiments.
Based on the same inventive concept, the present application also provides a storage medium, on which a computer program is stored, and when the computer program instructions are run on a computer, the computer program instructions cause the computer processor to execute the steps of the temperature correction method of the power battery according to various embodiments of the present application described above in this specification.
In some possible embodiments, the various aspects of the temperature correction method for a power battery provided by the present application may also be implemented in the form of a program product, which includes program code for causing a computer device to perform 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 when the program product runs on the computer device, for example, the computer device may perform the steps of the embodiments.
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 electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having 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 disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The program product of embodiments of the present application may employ a portable compact disc read only memory (CD-ROM) and include program code, and may be run on a computing device. However, the program product of the present application is not so limited, and in the context of this application, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A readable signal medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable signal medium may be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with a command execution system, apparatus, or device.
Program code embodied on a 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.
Program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user computing device, partly on the user equipment, as a stand-alone software package, partly on the user computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of remote computing devices, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
It should be noted that although several units or sub-units of the apparatus are mentioned in the above detailed description, such division is merely exemplary and not mandatory. Indeed, the features and functions of two or more units described above may be embodied in one unit, according to embodiments of the application. Conversely, the features and functions of one unit described above may be further divided into embodiments by a plurality of units.
Further, while the operations of the methods of the present application are depicted in the drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (12)

1. A temperature correction method of a power battery is characterized by being applied to a hybrid vehicle, wherein the hybrid vehicle comprises the power battery and an engine, the power battery comprises a first type battery module and a second type battery module, the first type battery module and the second type battery module are affected by heat radiation of the engine to a degree larger than a preset threshold value, and the method comprises the following steps:
determining that a correction scene condition of the power battery is met based on the running parameters of the hybrid vehicle;
determining that a correction starting condition of the first type of battery module is met 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, which are output by a temperature sensor;
determining a temperature correction reference value of the first battery module based on the second battery cell temperature;
determining a temperature correction target value of the first battery module based on the temperature correction reference value and the first battery cell temperature;
and correcting the first battery cell temperature output by the temperature sensor based on the temperature correction target value.
2. The method of claim 1, wherein the travel parameters include the travel speed and a power value of the engine, and the determining that the revised context condition for the power cell is satisfied based on the travel 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 running speed and the power value within the first time period which is a first preset time length away from the current time;
and if the first speed characteristic value is smaller than a first speed characteristic threshold value and the power characteristic value is larger than a preset power characteristic threshold value, determining that the condition of correcting the scene is met.
3. The method of claim 1, wherein the first type of battery module comprises at least one first battery module, the second type of battery module comprises at least one second battery module, and the determining that the modified on 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 comprises:
determining a working temperature characteristic value of the power battery based on the first cell temperature of each first battery module and the second cell temperature of each second battery module;
determining a temperature correction critical value based on the second cell temperature of each second battery module;
and when the working temperature characteristic value is not greater than the working temperature upper limit value and the battery core temperature of any one first battery module is not less than the temperature correction critical value, determining that the temperature correction condition is met.
4. The method of claim 3, wherein the cell temperature of each battery module includes a cell edge temperature and a cell middle temperature, and the determining that the temperature correction condition is met when the operating temperature characteristic value is not greater than an operating temperature upper limit value and the cell temperature of any first battery module is not less than the temperature correction critical value includes:
and when the working temperature characteristic value is not greater than the working temperature upper limit value and the cell edge temperature of any one first battery module is not less than the temperature correction critical value, determining that the temperature correction condition is met.
5. The method of claim 4, wherein the determining the temperature correction target value of the first type of battery module based on the temperature correction reference value and the first cell temperature comprises:
for each first battery module in the first battery modules, respectively executing the following operations:
and determining the temperature correction target value based on a first difference value between the edge temperature of the battery core of the first battery module and the middle temperature of the battery core and the temperature correction reference value.
6. The method of claim 3, wherein the correcting the first cell temperature output by the temperature sensor based on the temperature correction target value comprises:
for each first battery module, respectively executing the following operations:
determining a second difference between the first 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 value;
and determining the sum of the first cell temperature and the temperature compensation value as the actual cell temperature for carrying out battery thermal management on the first type of battery module.
7. The method of any one of claims 1 to 6, wherein after determining that the modified turn-on condition of the first type battery module is satisfied 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 sensors, the method further comprises:
if the influence degree of the first type of battery module by the heat radiation of the engine is not greater than the preset threshold value, determining that the corrected closing condition of the power battery is met;
adjusting a 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 smaller than the first adjustment rate;
determining a sum between the first cell temperature and the temperature compensation value as the actual cell temperature; alternatively, the first and second electrodes may be,
and determining the first cell temperature as the actual cell temperature.
8. The method according to claim 7, characterized in that it is determined that the degree of influence of the first-type battery module by the heat radiation of the engine is not more than the preset threshold when any one of the following conditions is satisfied:
a second speed characteristic value corresponding to a second time period which is a second preset time length away from the current time is not less than a second speed characteristic threshold value;
the working temperature characteristic value of the power battery is greater than the working temperature upper limit value;
and when the duration of temperature correction on the first type of battery module is not less than a preset duration threshold, the correction scene condition and the correction starting condition are not met.
9. A temperature correction device for a power battery, characterized by being applied to a hybrid vehicle including a power battery and an engine, the power battery including first-type battery modules influenced by heat radiation of the engine to a degree greater than a preset threshold value and second-type battery modules other than the first-type battery modules, the device comprising:
a scene determination unit for determining a corrected scene condition that satisfies the power battery based on a driving parameter of the hybrid vehicle;
the starting determining unit is used for determining that the corrected starting condition of the first type of battery module is met 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 which are output by the temperature sensor;
the parameter determining unit is used for determining a temperature correction reference value of the first battery module based on the second battery core temperature;
the target determining unit is used for determining a temperature correction target value of the first battery module based on the temperature correction reference value and the first battery cell temperature;
and the correction unit is used for correcting the first battery cell temperature output by the temperature sensor based on the temperature correction target value.
10. A hybrid vehicle characterized by comprising a power battery and an engine, and the temperature correction device of the power battery according to claim 9.
11. A computer device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method according to any one of claims 1 to 8 when executing said computer program.
12. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 8.
CN202211346561.8A 2022-10-31 2022-10-31 Temperature correction method, device and equipment for power battery and storage medium Pending CN115675442A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117423939A (en) * 2023-12-19 2024-01-19 兰洋(宁波)科技有限公司 Energy storage battery cell temperature equalizing system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117423939A (en) * 2023-12-19 2024-01-19 兰洋(宁波)科技有限公司 Energy storage battery cell temperature equalizing system
CN117423939B (en) * 2023-12-19 2024-03-05 兰洋(宁波)科技有限公司 Energy storage battery cell temperature equalizing system

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