CN117341537A - Thermal management method, device, vehicle and readable storage medium - Google Patents

Thermal management method, device, vehicle and readable storage medium Download PDF

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Publication number
CN117341537A
CN117341537A CN202210745019.3A CN202210745019A CN117341537A CN 117341537 A CN117341537 A CN 117341537A CN 202210745019 A CN202210745019 A CN 202210745019A CN 117341537 A CN117341537 A CN 117341537A
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China
Prior art keywords
heat treatment
temperature
request
determining
requests
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CN202210745019.3A
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Chinese (zh)
Inventor
卢娜
冉姗姗
叶进
曹向茹
郑辰钊
霍晨光
王继荣
刘顺
张春美
刘帅
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Great Wall Motor Co Ltd
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Great Wall Motor Co Ltd
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Priority to CN202210745019.3A priority Critical patent/CN117341537A/en
Publication of CN117341537A publication Critical patent/CN117341537A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/04—Cutting off the power supply under fault conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Automation & Control Theory (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The embodiment of the invention provides a thermal management method, a device, a vehicle and a readable storage medium, wherein the method is used for acquiring the highest temperature and the lowest temperature of each battery pack based on the current temperature of each battery pack in the vehicle; determining a heat treatment request to be performed based on the highest temperature and the lowest temperature; in the case where there are at least two heat treatment requests to be performed, a target heat treatment request is determined from the at least two heat treatment requests to be performed based on the highest temperature and the lowest temperature and the target heat treatment request is responded to. Therefore, when the target heat treatment request is determined, the fixing strategy that the cooling is larger than the heating and is larger than the average temperature is not adopted, the target heat treatment request is determined according to the current temperature of the battery pack, and different target heat treatment requests are determined according to the difference of the highest temperature and the lowest temperature, so that corresponding heat management can be performed based on the actual service condition of the battery, the flexibility of heat management is improved, and the service life of the battery can be further ensured to a certain extent.

Description

Thermal management method, device, vehicle and readable storage medium
Technical Field
The present invention relates to the field of automobiles, and more particularly, to a thermal management method, a thermal management device, a vehicle, and a readable storage medium.
Background
With the continuous development of society, the power energy of vehicles has also changed. At present, many new energy automobiles including hybrid electric vehicles, pure electric vehicles, other new energy automobiles and the like have appeared. For electric vehicles, the performance state of the power battery is particularly important, and the working temperature can have a great influence on the working performance of the power battery.
In the prior art, the thermal management cannot be flexibly performed according to the actual condition of the battery.
Disclosure of Invention
The invention provides a thermal management method, a thermal management device, a vehicle and a readable storage medium, so as to solve the problem of poor thermal management flexibility of a battery in the prior art.
In order to solve the technical problems, the invention is realized as follows:
in a first aspect, the present invention provides a method of thermal management, the method comprising:
acquiring the highest temperature and the lowest temperature in each battery pack based on the current temperature of each battery pack in the vehicle;
determining a heat treatment request to be performed based on the maximum temperature and the minimum temperature;
in the case where there are at least two heat treatment requests to be performed, a target heat treatment request is determined from the at least two heat treatment requests to be performed based on the highest temperature and the lowest temperature and the target heat treatment request is responded to.
In a second aspect, the present invention provides a thermal management device, the device comprising:
a temperature acquisition module for acquiring a highest temperature and a lowest temperature in each battery pack based on a current temperature of each battery pack in a vehicle;
a first determining module for determining a heat treatment request to be performed based on the maximum temperature and the minimum temperature;
and a second determining module for determining a target heat treatment request from the at least two heat treatment requests to be executed based on the highest temperature and the lowest temperature and responding to the target heat treatment request in the case that there are at least two heat treatment requests to be executed.
In a third aspect, the present invention provides a vehicle comprising one or more processors; and one or more readable storage media storing instructions that, when executed by the one or more processors, cause the vehicle to perform the above-described thermal management method.
In a fourth aspect, the invention provides a readable storage medium, which when executed by one or more processors, causes the processors to perform the above-described thermal management method.
In the embodiment of the invention, the highest temperature and the lowest temperature in each battery pack are obtained based on the current temperature of each battery pack in the vehicle; determining a heat treatment request to be performed based on the maximum temperature and the minimum temperature; in the case where there are at least two heat treatment requests to be performed, a target heat treatment request is determined from the at least two heat treatment requests to be performed based on the highest temperature and the lowest temperature and the target heat treatment request is responded to. Therefore, when the target heat treatment request is determined, the fixing strategy that the cooling is larger than the heating and is larger than the average temperature is not adopted, the target heat treatment request is determined according to the current temperature of the battery pack, and different target heat treatment requests are determined according to the difference of the highest temperature and the lowest temperature, so that corresponding heat management can be performed based on the actual service condition of the battery, the flexibility of heat management is improved, and the service life of the battery can be further ensured to a certain extent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of steps of a thermal management method according to an embodiment of the present invention;
fig. 2 is a block diagram of a thermal management device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
FIG. 1 is a flowchart illustrating steps of a thermal management method according to an embodiment of the present invention, as shown in FIG. 1, the method may include:
and 101, acquiring the highest temperature and the lowest temperature of each battery pack based on the current temperature of each battery pack in the vehicle.
Among them, electric vehicles are typically powered by a battery pack, and the battery pack is typically arranged with a plurality of battery packs. Specifically, in the actual use process of the electric vehicle, in order to ensure the normal operation and the service life of the battery pack, the temperature of each battery pack needs to be kept within a preset range, the preset range is usually-20 ℃ to +43 ℃, and when the temperature of the battery pack exceeds the preset range, the battery pack needs to be subjected to corresponding thermal management so as to restore the temperature of each battery pack to be within the preset range.
Specifically, a temperature sensor may be respectively provided for each battery pack, where the temperature sensor monitors the temperature of each battery pack in the battery pack to obtain the temperature of each battery pack, and transmits a plurality of temperature values to a processing system of the vehicle, where the processing system may compare the plurality of temperature values to obtain a maximum value and a minimum value, that is, a maximum temperature Tmax and a minimum temperature Tmin. Optionally, the temperature sensor may transmit the temperature of each battery pack to the processing system in real time, or the processing system may actively call the temperature of each battery pack according to a preset period. Alternatively, the processing system may be a VCU (Vehicle Control Unit, vehicle controller).
Step 102, determining a heat treatment request to be executed based on the highest temperature and the lowest temperature.
Wherein the heat treatment request to be performed may include at least one of a soaking temperature request, a cooling request, and a heating request. The determined heat treatment requests to be performed are also different for different maximum and minimum temperatures. For example, in one case, when the maximum temperature is not less than the first limit value, the cooling request is included in the determined heat treatment request to be executed, in another case, when the minimum temperature is less than the second limit value, the heating request is included in the determined heat treatment request to be executed, and in yet another case, when the difference between the maximum temperature and the minimum temperature is not less than the preset difference, the temperature equalization request is included in the determined heat treatment request to be executed.
Specifically, the first limit value and the preset temperature difference may be obtained through a preset test before the vehicle leaves the factory, or a default value may be set, the second limit value may be obtained in real time according to the SOC (state of charge) of the battery pack, and the second limit value is different under different SOCs. Alternatively, the first limit may be +38 ℃, the second limit may be-18 ℃, and the preset temperature difference may be 5 ℃.
Step 103, in the case that there are at least two heat treatment requests to be executed, determining a target heat treatment request from the at least two heat treatment requests to be executed based on the highest temperature and the lowest temperature and responding to the target heat treatment request.
When the highest temperature and the lowest temperature meet at least two conditions in the step 102, the heat treatment request to be executed may include at least two requests, and at this time, priority determination needs to be performed on at least two requests to be executed, and a request with the highest priority is determined from the multiple requests to be executed, that is, the target heat treatment request. For example, when the minimum temperature is not less than the first limit value and the temperature difference between the maximum temperature and the minimum temperature is not less than the preset temperature difference, the heat treatment request to be executed may include a temperature equalization request and a cooling request, and at this time, different target heat treatment requests may be determined according to different maximum temperatures and minimum temperatures.
Wherein responding to the target heat treatment request refers to sending the target heat treatment request to the corresponding execution mechanism so that the execution mechanism executes the corresponding operation. Specifically, the actuating mechanism corresponding to the heating request may include a PTC (Positive Temperature Coefficient, electric heater) in the vehicle air conditioning system, and/or a water pump to heat the battery pack, and optionally, when the vehicle is a hybrid electric vehicle, the actuating mechanism corresponding to the heating request may further include an engine hot water tank. Specifically, the actuator corresponding to the cooling request may include a water pump, and/or a radiator to cool the battery pack. The actuating mechanism corresponding to the temperature equalizing request can comprise a water pump so as to keep the temperature of each battery pack in the battery pack balanced.
In summary, in the embodiment of the present invention, the highest temperature and the lowest temperature in each battery pack are obtained based on the current temperature of each battery pack in the vehicle; determining a heat treatment request to be performed based on the maximum temperature and the minimum temperature; in the case where there are at least two heat treatment requests to be performed, a target heat treatment request is determined from the at least two heat treatment requests to be performed based on the highest temperature and the lowest temperature and the target heat treatment request is responded to. Therefore, when the target heat treatment request is determined, the fixing strategy that the cooling is larger than the heating and is larger than the average temperature is not adopted, the target heat treatment request is determined according to the current temperature of the battery pack, and different target heat treatment requests are determined according to the difference of the highest temperature and the lowest temperature, so that corresponding heat management can be performed based on the actual service condition of the battery, the flexibility of heat management is improved, and the service life of the battery can be further ensured to a certain extent.
Optionally, the determining the target heat treatment request from the at least two heat treatment requests to be performed based on the highest temperature and the lowest temperature may specifically include:
and S21, determining the target heat treatment request as a uniform temperature request under the condition that the highest temperature is smaller than a first preset value and the lowest temperature is not smaller than a second preset value.
Wherein the first preset value is greater than the first limit value, the second preset value is less than the second limit value, and when the maximum temperature is less than the first preset value, there may be a case of greater than the first limit value, and the heat treatment request to be executed includes a cooling request. When the lowest temperature is not less than the second preset value, there may be a case of being less than the second limit value, and the heat treatment request to be executed includes a heating request, and when the temperature difference between the highest temperature and the lowest temperature is greater than the preset temperature difference, the heat treatment request to be executed further includes a temperature equalization request.
Specifically, when the highest temperature is less than the first preset value and the lowest temperature is not less than the second preset value in the case where there are at least two heat treatment requests to be performed, it is indicated that the battery pack temperature at this time is not too low, without preferential heating, nor too high, thermal runaway does not occur, and battery energy can be normally used,
therefore, the priority of the temperature equalization request is only required to be the highest at this time, and the temperature equalization among the battery packs is ensured. For example, taking the first preset value of 43 ℃, the first limit value of 38 ℃, the second preset value of-20 ℃, the second limit value of-18 ℃, and the preset temperature difference of 5 ℃ as an example, when the highest temperature is 40 ℃ and the lowest temperature is-15 ℃, the highest temperature is larger than the first limit value, and the temperature difference between the highest temperature and the lowest temperature is not smaller than the preset temperature difference, at this time, the heat treatment request to be executed comprises a cooling request and a temperature equalization request, but because the highest temperature is smaller than the first preset value, the battery pack temperature at this time is not in a high temperature condition, thermal runaway cannot occur, and the temperature equalization can be preferentially carried out.
Step S22, determining that the target heat treatment request is a cooling request when the highest temperature is not smaller than the first preset value and the lowest temperature is not smaller than the second preset value.
Wherein when the highest temperature is not less than the first preset value, the heat treatment request to be executed includes a cooling request. When the lowest temperature is not less than the second preset value, there may be a case of being less than the second limit value, and the heat treatment request to be executed includes a heating request, and when the temperature difference between the highest temperature and the lowest temperature is greater than the preset temperature difference, the heat treatment request to be executed further includes a temperature equalization request.
Specifically, when there are at least two heat treatment requests to be performed, and the highest temperature is not less than the first preset value and the lowest temperature is not less than the second preset value, it indicates that the battery pack at this time has been overheated, and at this time, the priority of the cooling request needs to be the highest in order to prevent thermal runaway of the battery pack. For example, taking the first preset value of 43 ℃, the first limit value of 38 ℃, the second preset value of-20 ℃, the second limit value of-18 ℃, and the preset temperature difference of 5 ℃ as an example, when the highest temperature is 43 ℃ and the lowest temperature is-15 ℃, the highest temperature is larger than the first limit value, and the temperature difference between the highest temperature and the lowest temperature is not smaller than the preset temperature difference, at this time, the heat treatment request to be executed includes a cooling request and a temperature equalization request, and at the same time, because the highest temperature is not smaller than the first preset value, the battery pack temperature at this time is overheated, thermal runaway may occur, and the cooling needs to be preferentially performed.
Step S23, determining that the target heat treatment request is a heating request when the maximum temperature is less than the first preset value and the minimum temperature is less than the second preset value.
Wherein when the highest temperature is smaller than the first preset value, there may be a case where the highest temperature is larger than the first limit value, and the heat treatment request to be performed includes a cooling request. When the minimum temperature is smaller than the second preset value, the heat treatment request to be executed comprises a heating request, and when the temperature difference between the maximum temperature and the minimum temperature is larger than the preset temperature difference, the heat treatment request to be executed further comprises a temperature equalizing request.
Specifically, when there are at least two heat treatment requests to be executed, and the highest temperature is less than the first preset value and the lowest temperature is less than the second preset value, it indicates that the temperature of the battery pack is too low, and the battery pack has no high-voltage discharging function under the condition that the temperature is too low, so that normal running of the vehicle can be affected, and at the moment, the priority of the heating request needs to be the highest, so that the battery is heated as soon as possible. For example, taking the first preset value of 43 ℃, the first limit value of 38 ℃, the second preset value of-20 ℃, the second limit value of-18 ℃, and the preset temperature difference of 5 ℃ as an example, when the highest temperature is 37 ℃ and the lowest temperature is-23 ℃, at this time, the lowest temperature is smaller than the second limit value, and the temperature difference between the highest temperature and the lowest temperature is not smaller than the preset temperature difference, at this time, the heat treatment request to be executed includes a heating request and a temperature equalization request, and at the same time, because the lowest temperature is smaller than the second preset value, it is indicated that the battery pack temperature at this time is already low, and the heating needs to be preferentially performed so as not to influence the normal running of the vehicle.
In the embodiment of the invention, the target heat treatment request is determined to be a uniform temperature request under the condition that the highest temperature is smaller than a first preset value and the lowest temperature is not smaller than a second preset value; determining that the target heat treatment request is a cooling request under the condition that the highest temperature is not smaller than the first preset value and the lowest temperature is not smaller than a second preset value; and determining that the target heat treatment request is a heating request under the condition that the highest temperature is smaller than the first preset value and the lowest temperature is smaller than the second preset value. Therefore, when two or more heat treatment requests occur, the battery management system can flexibly control according to the actual conditions of the battery, adopts different priorities at different temperatures, fully and reasonably uses the battery, and improves the flexibility of the heat management.
Optionally, the above operation of determining the target heat treatment request from the at least two heat treatment requests to be performed based on the highest temperature and the lowest temperature may specifically further include:
and S31, determining that each battery pack is in a fault state and executing fault processing operation under the condition that the highest temperature is not smaller than the first preset value and the lowest temperature is smaller than the second preset value.
The fault handling operation may include, among other things, issuing a fault warning (warning light, warning sound, etc.), and disabling the use of the battery. Specifically, when the maximum temperature is not less than the first preset value, the heat treatment request to be executed includes a cooling request. When the minimum temperature is smaller than the second preset value, the heat treatment request to be executed comprises a heating request, and meanwhile, the temperature difference between the maximum temperature and the minimum temperature is larger than the preset temperature difference, and the heat treatment request to be executed further comprises a temperature equalizing request.
Specifically, in the case where there are at least two heat treatment requests to be performed, when the maximum temperature is not less than the first preset value and the minimum temperature is less than the second preset value, it is indicated that the temperatures of the battery packs in the battery pack at this time are extremely unbalanced, the battery pack has failed, in which case the upper high-voltage running must be prohibited, and the user is reminded to perform the inspection, generally, no occurrence of the case where the maximum temperature is not less than the first preset value and the minimum temperature is less than the second preset value.
In this case, the heating request may be first set as the target heat treatment request, or alternatively, the soaking request or the cooling request may be set as the target heat treatment request, but the actuator does not respond to the target heat treatment request when the fault handling operation is performed. For example, taking the example that the first preset value is 43 ℃, the first limit value is 38 ℃, the second preset value is-20 ℃, the second limit value is-18 ℃, the preset temperature difference is 5 ℃, when the highest temperature is 45 ℃, the lowest temperature is-23 ℃, at this time, the highest temperature is not less than the second preset value, the lowest temperature is less than the second preset value, and the temperature difference between the highest temperature and the lowest temperature is not less than the preset temperature difference, at this time, the heat treatment request to be executed comprises a cooling request, a heating request and a temperature equalization request, which indicates that the battery pack at this time has a fault, the heating request can be used as a target heat treatment request, and the fault treatment operation is executed.
In the embodiment of the invention, the target heat treatment request is determined to be a heating request and the fault treatment operation is executed under the condition that the highest temperature is not smaller than the first preset value and the lowest temperature is smaller than the second preset value, so that the fault treatment operation is executed in time when the temperature difference between the highest temperature and the lowest temperature of the battery pack is overlarge, and the safety accident of the vehicle is avoided.
Optionally, the determining, based on the highest temperature and the lowest temperature, a target heat treatment request from the at least two heat treatment requests to be performed and responding to the target heat treatment request may specifically include:
step S41, adjusting the priority of the heat treatment request based on the highest temperature and the lowest temperature.
Wherein, an initial priority level can be preset: the cooling > heating > soaking temperature, and when the current temperature of the battery pack does not satisfy any of the conditions of the above steps S21 to S31, the target heat treatment request may be determined according to the initial priority.
Specifically, when the heat treatment request to be executed includes the temperature equalization, cooling and heating requests at the same time, in one case, when the current temperature of the battery pack satisfies the condition of the above step S21, the initial priority may be adjusted to maximize the priority of the temperature equalization request, and in order to prevent the temperature from affecting the normal running of the vehicle, the priority of the heating request may be higher than the cooling request, and at this time, the priority of the heat treatment request may be equal temperature > heating > cooling. In another case, when the current temperature of the battery pack satisfies the condition in the above step S22, the priority of the cooling request may be highest, and at the same time, in order to ensure temperature equalization between the battery packs, the priority of the temperature equalization request may be higher than the heating request, and at this time, the priority of the heat treatment request may be cooling > temperature equalization > heating, and in yet another case, when the current temperature of the battery pack satisfies the condition in the above step S23, the priority of the heating request may be highest, and at the same time, in order to ensure temperature equalization between the battery packs, the priority of the temperature equalization request may be higher than the cooling request, and at this time, the priority of the heat treatment request may be heating > temperature equalization > cooling.
Step S42, the heat treatment request with the highest priority is determined as a target heat treatment request and responded.
Specifically, after adjusting the priorities of the heat treatment requests, the VCU may read, as the target heat treatment request, the heat treatment request with the highest priority among the adjusted priorities.
The above responding operation may refer to the description of step 103, and is not repeated here.
In the prior art, for thermal management of a power battery, a fixed priority level that cooling is greater than heating is generally adopted to control the temperature of the battery, however, this mode cannot be processed according to the actual situation of the battery, so that the battery cannot be fully used, and the service life of the battery is affected. In the embodiment of the invention, the priority of the heat treatment request is adjusted based on the highest temperature and the lowest temperature; the heat treatment request with the highest priority is determined as the target heat treatment request and is responded, different priorities can be determined according to the difference of the highest temperature and the lowest temperature, and the use of fixed priorities is avoided, so that corresponding heat management can be performed based on the actual condition of the battery, and the battery can be fully and reasonably used.
Optionally, in the embodiment of the present invention, the determining the operation of the heat treatment request to be performed at the highest temperature and the lowest temperature may specifically include:
step S51, determining that the heat treatment request to be executed includes a cooling request in a case where the maximum temperature is not less than a first limit value.
Step S52, determining that the heat treatment request to be executed includes a heating request in a case where the minimum temperature is less than a second limit value.
Step S53, determining that the heat treatment request to be executed comprises a temperature equalization request when the temperature difference between the highest temperature and the lowest temperature is not smaller than a preset temperature difference.
In the embodiment of the present invention, the steps S51-S53 may refer to the related description of the step 102, and are not repeated here.
In the embodiment of the invention, under the condition that the highest temperature is not smaller than a first limit value, determining that the heat treatment request to be executed comprises a cooling request; determining that the heat treatment request to be performed includes a heating request in a case where the minimum temperature is less than a second limit value; acquiring the temperature difference between the highest temperature and the lowest temperature; and under the condition that the temperature difference is not smaller than a preset temperature difference, determining that the heat treatment request to be executed comprises a temperature equalization request. In this way, the heat treatment request to be executed can be automatically determined based on different highest temperature and lowest temperature, so that corresponding heat management operation is adopted based on the real-time temperature value of the battery pack, and the normal operation of the battery pack is ensured.
Optionally, in the embodiment of the present invention, after the determining, from the at least two heat treatment requests to be performed, the determining a target heat treatment request may specifically further include:
step S61, setting a first characterization signal corresponding to the target heat treatment request to an activated state.
The first characterization signal may be a bool (boolean variable) signal, which is used to characterize whether the corresponding heat treatment request is in an activated state. Specifically, when the first characterization signal is set to 1: and when active, the corresponding heat treatment request of the signal is activated, and at the moment, a corresponding execution signal can be sent to a corresponding execution mechanism. When the first characterization signal is set to 0: and when the corresponding actuating mechanism is in the inactive state, the corresponding heat treatment request of the signal is not activated, and at the moment, the corresponding actuating signal cannot be sent to the corresponding actuating mechanism.
Step S62, setting characterization signals corresponding to other heat treatment requests to be in an inactive state; the other heat treatment requests are heat treatment requests other than the target heat treatment request.
When the target heat treatment request is a temperature equalization request, the other heat treatment requests are a heating request and a cooling request, and correspondingly, when the target heat treatment request is a heating request, the other heat treatment requests are a temperature equalization request and a cooling request, and when the target heat treatment request is a cooling request, the other heat treatment requests are a heating request and a temperature equalization request.
Specifically, three characterization signals may be set to characterize whether the heating request, the cooling request and the temperature equalization request are in an activated state, and the characterization signal corresponding to the target heat treatment request is used as the first characterization signal. Accordingly, a technician can read the first characterization signal in the background to acquire the current target heat treatment request, so as to realize real-time monitoring of heat management of the battery pack.
Optionally, after the processing system VCU of the vehicle sets the characterization signals corresponding to the heat treatment requests to the corresponding states, the corresponding operation may be performed by the execution mechanism corresponding to the target heat treatment request by outputting the values of the corresponding characterization signals to the execution mechanism, and the VCU may also generate the corresponding execution signals by reading the values of the characterization signals and send the corresponding execution signals to the corresponding execution mechanism.
In the embodiment of the invention, after a target heat treatment request is determined from the at least two heat treatment requests to be executed, a first characterization signal corresponding to the target heat treatment request is set to be in an activated state; setting characterization signals corresponding to other heat treatment requests to be in an inactive state; the other heat treatment requests are heat treatment requests except the target heat treatment request, so that the current target heat treatment request is characterized by setting the state of the characterization signal, the current target heat treatment request can be obtained by reading the characterization signal, and the monitoring efficiency of heat management of the battery pack can be improved.
Optionally, in the embodiment of the present invention, after the determining, from the at least two heat treatment requests to be performed, the determining a target heat treatment request may specifically further include:
step S71, setting a characterization bit corresponding to the target heat treatment request in a preset second characterization signal to be in an activated state.
The preset second characterization signal may be a uint8 (unsigned 8-bit integer) signal, where the uint8 signal includes 8 bits (bytes), and three bits may be selected to respectively characterize whether the three heat treatment requests are in an activated state, where the characterization bits refer to bits in the uint8 signal. Specifically, bit0, bit1 and bit2 in the preset second characterization signal may correspond to the heating request, the temperature equalization request and the cooling request respectively, so that when the target heat treatment request is the heating request, the heating request may be characterized by setting bit0 in the second characterization signal to 1, and at this time, a corresponding execution signal may be sent to a corresponding execution mechanism.
Step S72, setting the characterization bit corresponding to other heat treatment requests in the second characterization signal to be in an inactive state; the other heat treatment requests are heat treatment requests other than the target heat treatment request.
When the target heat treatment request is a temperature equalization request, the other heat treatment requests are a heating request and a cooling request, and correspondingly, when the target heat treatment request is a heating request, the other heat treatment requests are a temperature equalization request and a cooling request, and when the target heat treatment request is a cooling request, the other heat treatment requests are a heating request and a temperature equalization request.
Specifically, taking the example that bit0, bit1, and bit2 in the preset second characterization signals correspond to the heating request, the temperature equalization request, and the cooling request respectively, when the target heat treatment request is the heating request, the second characterization signal may be set to XXXXX001 (X represents other bits) at this time, so that the heating request is currently activated, and the temperature equalization request and the cooling request are not currently activated. Accordingly, a technician can read the second characterization signal in the background to acquire the current target heat treatment request, so as to realize real-time monitoring of heat management of the battery pack.
Optionally, after setting the preset second characterization signal to a corresponding state, the processing system VCU of the vehicle may output, to the executing mechanism, the value of each characterization bit in the second characterization signal, so that the executing mechanism corresponding to the target heat treatment request executes a corresponding operation, and the VCU may also generate a corresponding executing signal by reading the value of the characterization signal and send the corresponding executing signal to the corresponding executing mechanism.
In the embodiment of the invention, after a target heat treatment request is determined from the at least two heat treatment requests, a characterization bit corresponding to the target heat treatment request in a preset second characterization signal is set to be in an activated state; setting a characterization bit corresponding to other heat treatment requests in the second characterization signal to be in an inactive state; the other heat treatment requests are heat treatment requests other than the target heat treatment request. Therefore, the current target heat treatment request is characterized by setting the second characterization signal, and the current target heat treatment request can be obtained by reading the second characterization signal, so that the monitoring efficiency of heat management of the battery pack can be improved, and meanwhile, the respective states of the current heat treatment requests can be characterized by only setting one characterization signal, so that the throughput of a processing system is reduced.
FIG. 2 is a block diagram of a thermal management device according to an embodiment of the present invention, the device 20 may include:
a temperature acquisition module 201 for acquiring a maximum temperature and a minimum temperature in each battery pack based on a current temperature of each battery pack in a vehicle;
a first determining module 202 for determining a heat treatment request to be performed based on the maximum temperature and the minimum temperature;
a second determining module 203, configured to determine, in a case where there are at least two heat treatment requests to be performed, a target heat treatment request from the at least two heat treatment requests to be performed based on the maximum temperature and the minimum temperature, and respond to the target heat treatment request.
Optionally, the second determining module 203 is specifically configured to:
determining that the target heat treatment request is a uniform temperature request under the condition that the highest temperature is smaller than a first preset value and the lowest temperature is not smaller than a second preset value;
determining that the target heat treatment request is a cooling request under the condition that the highest temperature is not smaller than the first preset value and the lowest temperature is not smaller than a second preset value;
and determining that the target heat treatment request is a heating request under the condition that the highest temperature is smaller than the first preset value and the lowest temperature is smaller than the second preset value.
Optionally, the second determining module 203 is further specifically configured to:
and under the condition that the highest temperature is not smaller than the first preset value and the lowest temperature is smaller than the second preset value, determining that each battery pack is in a fault state, and executing fault processing operation.
Optionally, the second determining module 203 is further specifically configured to:
adjusting the priority of the heat treatment request based on the highest temperature and the lowest temperature;
and determining the heat treatment request with the highest priority as a target heat treatment request and responding.
Optionally, the first determining module 202 is specifically configured to:
determining that the heat treatment request to be performed includes a cooling request in a case where the maximum temperature is not less than a first limit value;
determining that the heat treatment request to be performed includes a heating request in a case where the minimum temperature is less than a second limit value;
and determining that the heat treatment request to be executed comprises a temperature equalization request under the condition that the temperature difference between the highest temperature and the lowest temperature is not smaller than a preset temperature difference.
Optionally, the apparatus 20 further includes:
the first setting module is used for setting a first characterization signal corresponding to the target heat treatment request to be in an activated state after determining the target heat treatment request from the at least two heat treatment requests to be executed;
the second setting module is used for setting the characterization signals corresponding to other heat treatment requests to be in an inactive state; the other heat treatment requests are heat treatment requests other than the target heat treatment request.
Optionally, the apparatus 20 further includes:
a third setting module, configured to set a characterization bit corresponding to the target heat treatment request in a preset second characterization signal to an activated state after determining the target heat treatment request from the at least two heat treatment requests to be executed;
a fourth setting module, configured to set a characterization bit corresponding to other heat treatment requests in the second characterization signal to an inactive state; the other heat treatment requests are heat treatment requests other than the target heat treatment request.
In summary, in the embodiment of the present invention, the highest temperature and the lowest temperature in each battery pack are obtained based on the current temperature of each battery pack in the vehicle; determining a heat treatment request to be performed based on the maximum temperature and the minimum temperature; in the case where there are at least two heat treatment requests to be performed, a target heat treatment request is determined from the at least two heat treatment requests to be performed based on the highest temperature and the lowest temperature and the target heat treatment request is responded to. Therefore, when the target heat treatment request is determined, the fixing strategy that the cooling is larger than the heating and is larger than the average temperature is not adopted, the target heat treatment request is determined according to the current temperature of the battery pack, and different target heat treatment requests are determined according to the difference of the highest temperature and the lowest temperature, so that corresponding heat management can be performed based on the actual service condition of the battery, the flexibility of heat management is improved, and the service life of the battery can be further ensured to a certain extent.
The present invention also provides a vehicle comprising one or more processors; and one or more readable storage media storing instructions that, when executed by the one or more processors, cause the vehicle to perform the method of the preceding embodiment.
The invention also provides a readable storage medium, which when executed by one or more processors, causes the processors to perform the method of the preceding embodiment.
For the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points.
The algorithms and displays presented herein are not inherently related to any particular computer, virtual system, or other apparatus. Various general-purpose systems may also be used with the teachings herein. The required structure for a construction of such a system is apparent from the description above. In addition, the present invention is not directed to any particular programming language. It will be appreciated that the teachings of the present invention described herein may be implemented in a variety of programming languages, and the above description of specific languages is provided for disclosure of enablement and best mode of the present invention.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that some or all of the functions of some or all of the components in a sorting device according to the present invention may be implemented in practice using a microprocessor or Digital Signal Processor (DSP). The present invention may also be implemented as an apparatus or device program for performing part or all of the methods described herein. Such a program embodying the present invention may be stored on a computer readable medium, or may have the form of one or more signals. Such signals may be downloaded from an internet website, provided on a carrier signal, or provided in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (10)

1. A method of thermal management, the method comprising:
acquiring the highest temperature and the lowest temperature in each battery pack based on the current temperature of each battery pack in the vehicle;
determining a heat treatment request to be performed based on the maximum temperature and the minimum temperature;
in the case where there are at least two heat treatment requests to be performed, a target heat treatment request is determined from the at least two heat treatment requests to be performed based on the highest temperature and the lowest temperature and the target heat treatment request is responded to.
2. The method of claim 1, wherein determining a target heat treatment request from the at least two heat treatment requests to be performed based on the maximum temperature and the minimum temperature comprises:
determining that the target heat treatment request is a uniform temperature request under the condition that the highest temperature is smaller than a first preset value and the lowest temperature is not smaller than a second preset value;
determining that the target heat treatment request is a cooling request under the condition that the highest temperature is not smaller than the first preset value and the lowest temperature is not smaller than a second preset value;
and determining that the target heat treatment request is a heating request under the condition that the highest temperature is smaller than the first preset value and the lowest temperature is smaller than the second preset value.
3. The method of claim 2, wherein the determining a target heat treatment request from the at least two heat treatment requests to be performed based on the maximum temperature and the minimum temperature, further comprises:
and under the condition that the highest temperature is not smaller than the first preset value and the lowest temperature is smaller than the second preset value, determining that each battery pack is in a fault state, and executing fault processing operation.
4. The method of claim 1, wherein determining a target heat treatment request from the at least two heat treatment requests to be performed and responding to the target heat treatment request based on the maximum temperature and the minimum temperature, further comprises:
adjusting the priority of the heat treatment request based on the highest temperature and the lowest temperature;
and determining the heat treatment request with the highest priority as a target heat treatment request and responding.
5. The method of claim 1, wherein the determining a heat treatment request to be performed based on the maximum temperature and the minimum temperature comprises:
determining that the heat treatment request to be performed includes a cooling request in a case where the maximum temperature is not less than a first limit value;
determining that the heat treatment request to be performed includes a heating request in a case where the minimum temperature is less than a second limit value;
and determining that the heat treatment request to be executed comprises a temperature equalization request under the condition that the temperature difference between the highest temperature and the lowest temperature is not smaller than a preset temperature difference.
6. The method of claim 1, wherein after determining a target heat treatment request from the at least two heat treatment requests to be performed, the method further comprises:
setting a first characterization signal corresponding to the target heat treatment request to be in an activated state;
setting characterization signals corresponding to other heat treatment requests to be in an inactive state; the other heat treatment requests are heat treatment requests other than the target heat treatment request.
7. The method of claim 1, wherein after the determining the target heat treatment request from the at least two heat treatment requests, the method further comprises:
setting a characterization bit corresponding to the target heat treatment request in a preset second characterization signal to be in an activated state;
setting a characterization bit corresponding to other heat treatment requests in the second characterization signal to be in an inactive state; the other heat treatment requests are heat treatment requests other than the target heat treatment request.
8. A thermal management device, the device comprising:
a temperature acquisition module for acquiring a highest temperature and a lowest temperature in each battery pack based on a current temperature of each battery pack in a vehicle;
a first determining module for determining a heat treatment request to be performed based on the maximum temperature and the minimum temperature;
and a second determining module for determining a target heat treatment request from the at least two heat treatment requests to be executed based on the highest temperature and the lowest temperature and responding to the target heat treatment request in the case that there are at least two heat treatment requests to be executed.
9. A vehicle, characterized by comprising:
one or more processors; and one or more readable storage media storing instructions that, when executed by the one or more processors, cause the vehicle to perform the method of any of claims 1-7.
10. A readable storage medium, characterized in that instructions in the storage medium, when executed by one or more processors, cause the processors to perform the method of any of claims 1-7.
CN202210745019.3A 2022-06-28 2022-06-28 Thermal management method, device, vehicle and readable storage medium Pending CN117341537A (en)

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