A power battery fast charging precooling control system

Abstract

The present application provides a power battery fast charging precooling control system, which can identify the user's super-fast charging intention during driving conditions, and calculate the remaining SOC to the nearest charging station travel point and the optimal temperature to the charging station travel point based on the remaining time to the charging station travel point, the remaining mileage and the vehicle power consumption information sent by the IDC. Then, when the system determines that the precooling time required for precooling at this time is greater than or equal to the remaining time to the charging station travel point, it sends a battery cooling request, a target flow request, and a target water temperature request to the vehicle controller, so that the vehicle controller sends a battery fast cooling flag to the air conditioning system controller and triggers the air conditioning system controller to perform corresponding cooling work. It can be seen that the control system can intelligently control the thermal management of the vehicle according to the user's vehicle use intention, thereby achieving the effect of greatly shortening the charging time, and at the same time can ensure that the rate is not reduced due to battery overheating in high-temperature charging conditions.

Description

Technical Field

[0001] The present application relates to the field of electric vehicles, and more specifically, to a power battery fast-charging pre-cooling control system. Background Art

[0002] At present, the charging rates of mainstream batteries in the industry are mainly concentrated in the range of 0.8C to 1.2C. With the rapid advancement of battery technology, high-rate charging systems have also been gradually mass-produced. As we all know, the starting temperature of the battery during high-temperature charging is generally higher than the starting temperature of the battery during normal-temperature charging, which will cause the high-temperature charging time to be generally longer than the normal-temperature charging time. Based on the current design of the battery cooling system, it cannot reduce the impact of the environment on the charging time, which makes the charging system less adaptable to the environment.

[0003] At the same time, for high-rate charging systems, due to the large charging current and high battery heat generation, the battery temperature rises quickly during charging. If the battery temperature is high at the beginning of charging, the high rate cannot be reached during charging, and the battery charging capacity cannot be fully released, which will undoubtedly increase the charging time. At this time, in order to ensure that the battery is still charged at the maximum rate in a high-temperature environment, strict requirements are required for the battery temperature at the beginning of charging, and the current driving cooling function cannot meet this requirement. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a power battery fast charging pre-cooling control system, which can significantly shorten the charging time and ensure as much as possible that the charging rate is not reduced due to battery overheating under high-temperature charging conditions.

[0005] In a first aspect, an embodiment of the present application provides a power battery fast charging precooling control system, wherein the power battery fast charging precooling control system includes a navigation map system, a vehicle controller, an air conditioning system controller, and a battery management system, wherein:

[0006] The navigation map system is used to obtain the travel point information set by the user on the map, the remaining time to reach the nearest charging station travel point, and the remaining mileage to reach the nearest charging station travel point;

[0007] The vehicle controller is used to receive the battery cooling request, the battery requested target flow rate and the battery requested target water temperature sent by the battery management system, and send the vehicle power consumption information to the battery management system;

[0008] The battery management system is used to calculate the remaining SOC to reach the nearest charging station travel point according to the remaining time, the remaining mileage and the vehicle power consumption information; and intelligently determine the required battery temperature, and predict the implementation time of requesting activation of the precooling function according to the current battery temperature and the battery temperature drop rate;

[0009] The vehicle controller is further used to send a battery fast cooling flag to the air conditioning system controller;

[0010] The air conditioning system controller is used to control the compressor and the electronic expansion valve on the refrigerant side to perform corresponding cooling work when receiving the battery fast cooling flag;

[0011] The vehicle controller is also used to switch the temperature control system to the fast cooling mode, and control the water pump to work according to the target flow rate requested by the battery; when the battery management system determines that it is necessary to exit the cooling mode, the battery fast cooling flag is set to 0, and the temperature control system is switched to exit the fast cooling mode.

[0012] In the above implementation process, the navigation map system sends the travel point information set by the user on the map, the remaining time to reach the nearest charging station travel point, and the remaining mileage to reach the nearest charging station travel point to the battery management system.

[0013] Furthermore, the battery management system determines whether the user has the intention of super-fast charging based on the travel point information set by the user on the map, and calculates the remaining SOC to the nearest charging station travel point based on the remaining time to the nearest charging station travel point, the remaining mileage and the vehicle power consumption information. Based on the remaining SOC to the nearest charging station travel point, the optimal temperature to the nearest charging station travel point is determined. If the pre-cooling function is triggered at this time, the time required for pre-cooling to complete is calculated. Based on the relationship between the time required for pre-cooling to complete and the remaining time to the nearest charging station travel point, determine whether the pre-cooling function needs to be activated. If activation is required, the battery cooling request, the battery request target flow rate and the battery cooling target water temperature are sent to the vehicle controller.

[0014] Furthermore, the vehicle controller can preferentially receive the battery cooling request, battery target flow rate and battery target water temperature sent by the battery management system, and then send the battery target water temperature and battery fast cooling flag to the air conditioning system controller; the air conditioning system controller can control the compressor and the electronic expansion valve on the refrigerant side to perform corresponding cooling work when receiving the battery fast cooling flag; thereafter, the vehicle controller can switch the temperature control system to the fast cooling mode, and control the water pump to work according to the battery target flow rate; when the battery management system determines that it is necessary to exit the fast cooling mode, it will no longer send a battery cooling request to the vehicle controller; the vehicle controller sets the battery fast cooling flag to 0, and switches the temperature control system to exit the fast cooling mode. It can be seen that by implementing this control method, the battery temperature can be cooled to the target temperature in advance before super fast charging, which can greatly shorten the charging time and ensure as much as possible that the rate is not reduced due to battery overheating in high temperature charging conditions.

[0015] Furthermore, the air conditioning system controller is further configured to close the electronic expansion valve on the refrigerant side of the battery cooler when it is determined that the battery fast cooling flag position is 0.

[0016] Furthermore, the air-conditioning system controller is specifically used to receive the battery requested target water temperature; and when receiving the battery fast cooling flag, adjust the compressor speed according to the battery requested target water temperature; and obtain the target superheat, and adjust the electronic expansion valve on the refrigerant side of the battery cooler according to the target superheat.

[0017] Furthermore, the battery management system is also used to execute the sending of the battery cooling request, the battery requested target flow rate and the battery requested target water temperature to the vehicle controller when it is determined that the fast cooling mode will not be exited.

[0018] Furthermore, the battery management system is also used to obtain the current remaining power of the power battery; and to determine whether the current remaining power is higher than a preset power threshold; if so, to send a battery cooling request, a battery requested target flow rate and a battery requested target water temperature to the vehicle controller, and to send the battery requested target water temperature to the air-conditioning system controller.

[0019] A second aspect of an embodiment of the present application provides an electronic device, which includes a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to perform linkage control on the power battery fast charging and pre-cooling system described in any one of the first aspect of the embodiments of the present application.

[0020] A third aspect of an embodiment of the present application provides a computer-readable storage medium, in which computer program instructions are stored. When the computer program instructions are read and executed by a processor, the processor performs linkage control on the power battery fast charging and pre-cooling system described in any one of the first aspects of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A system schematic diagram of a power battery fast charging precooling control system provided in an embodiment of the present application;

[0023] Figure 2A system flow diagram of a power battery fast charging pre-cooling control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0025] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] Example

[0027] Please see Figure 1 , Figure 1 A system schematic diagram of a power battery fast charging precooling control system is provided for an embodiment of the present application. The power battery fast charging precooling control system includes a vehicle controller 100, an air conditioning system controller 200, a battery management system 300 and a navigation map system 400, wherein:

[0028] The navigation map system 400 is used to obtain the travel point information set by the user on the map, the remaining time to reach the nearest charging station travel point, and the remaining mileage to reach the nearest charging station travel point;

[0029] The vehicle controller 100 is used to receive the battery cooling request, the battery requested target flow rate and the battery requested target water temperature sent by the battery management system 300, and send the vehicle power consumption information to the battery management system;

[0030] The battery management system 300 is used to calculate the remaining SOC to the nearest charging station travel point based on the remaining time, remaining mileage and vehicle power consumption information; and intelligently determine the required battery temperature, and predict the implementation time of requesting activation of the pre-cooling function based on the current battery temperature and the battery temperature drop rate;

[0031] The vehicle controller 100 is also used to send the battery fast cooling flag to the air conditioning system controller 200;

[0032] The air conditioning system controller 200 is used to control the electronic expansion valve on the compressor and the refrigerant side to perform corresponding cooling work when receiving the battery fast cooling flag;

[0033] The vehicle controller 100 is also used to switch the temperature control system to the fast cooling mode and control the water pump to work according to the target flow rate requested by the battery; when the battery management system 300 determines that it is necessary to exit the cooling mode, the battery fast cooling flag is set to 0 and the temperature control system is switched to exit the fast cooling mode.

[0034] As an optional implementation, the air conditioning system controller 200 is further configured to close the electronic expansion valve on the refrigerant side of the battery cooler when it is determined that the battery quick cooling flag position is 0.

[0035] As an optional implementation, the battery management system 300 is also used to obtain the current battery temperature of the power battery, the remaining mileage to the nearest charging station travel point, the remaining time to the nearest charging station travel point, and the power consumption information of the whole vehicle when receiving the fast charging intention input by the user; and calculate the remaining SOC to the nearest charging station travel point based on the remaining mileage, remaining time, and power consumption information of the whole vehicle; and based on the remaining SOC, intelligently optimize the optimal temperature to the nearest charging station travel point; intelligently determine whether the battery pre-cooling function needs to be activated based on the most recent temperature, current temperature, battery temperature drop rate, and the remaining time to the nearest charging station travel point; if so, send a battery cooling request, a battery request target flow rate, and a battery request target water temperature to the vehicle controller 100, and send the battery request target water temperature to the air-conditioning system controller 200.

[0036] As an optional implementation, the air conditioning system controller 200 is specifically used to receive a battery-requested target water temperature; and when receiving a battery fast cooling flag, adjust the compressor speed according to the battery-requested target water temperature; and obtain a target superheat, and adjust the electronic expansion valve on the refrigerant side of the battery cooler according to the target superheat.

[0037] As an optional implementation, the battery management system 300 is also used to obtain the current battery temperature and determine whether to exit the fast cooling mode according to the current battery temperature and the target battery temperature; if so, no longer send the battery cooling request to the vehicle controller. As an optional implementation, the battery management system 300 is also used to execute sending the battery cooling request, the battery request target flow rate and the battery request target water temperature to the vehicle controller 100 when it is determined that the cooling mode is not to be exited.

[0038] As an optional implementation, the battery management system 300 is also used to obtain the current remaining power of the power battery; and to determine whether the current remaining power is higher than a preset power threshold; if so, to send a battery cooling request, a battery requested target flow rate and a battery requested target water temperature to the vehicle controller 100, and to send the battery requested target water temperature to the air-conditioning system controller 200.

[0039] In this embodiment, when driving to the charging station without a driving pre-cooling strategy, the battery cooling threshold is usually higher (when the maximum battery temperature is higher than 38 degrees, enter cooling; when the maximum battery temperature is lower than 35 degrees, exit cooling). The battery temperature will stabilize at around 35 degrees. According to the test results of the summer calibration test, when the ambient temperature is 40 degrees, the charging starts at SOC0%, and the battery starting temperature is 35 degrees, the charging time to SOC80% is 23 minutes, and the charging time to SOC100% is 35.6 minutes.

[0040] Since the battery temperature is high at the beginning of charging, the charging rate is large, and the battery self-heating is large, the battery temperature rises to the maximum temperature boundary, triggering the over-temperature reduction rate.

[0041] In the case of a driving pre-cooling strategy, when the actual SOC is lower than 10% and the maximum battery temperature is higher than 25 degrees during driving, the battery management system will activate the battery pre-cooling strategy until the maximum battery temperature cools to 24 degrees. Therefore, when the vehicle drives to the charging station, the maximum battery temperature is about 25 degrees. According to the test results of the summer calibration test, when the ambient temperature is 40 degrees, the charging starts at SOC0%, and the battery starts at 25 degrees, the charging time to SOC80% is 16 minutes, and the charging time to SOC100% is 28.6 minutes.

[0042] Since the battery temperature is low at the beginning of charging, even if charging at a higher rate, the battery temperature can be kept in an appropriate range at all times, and the rate will not be reduced due to overheating.

[0043] In this embodiment, the method can adaptively adjust the battery precooling threshold according to the current battery SOC.

[0044] This method is based on the summer calibration test results of the vehicle model with a high-rate fast charging configuration. The relationship between the remaining SOC and the optimal temperature at the travel point to the nearest charging station is described as follows:

[0045] Remaining SOC to the nearest charging station travel point Optimal temperature at the trip point to the nearest charging station Less than 10% 25 degrees 10%≤SOC<30% 27 degrees 30%≤SOC<40% 29 degrees 40%≤SOC<50% 31 degrees SOC ≥ 50% No pre-cooling required

[0046] In this embodiment, the method can also meet the thermal comfort requirements of the passenger compartment.

[0047] Specifically, according to the results of the summer calibration test, during the battery pre-cooling process, the passenger compartment felt subjectively more comfortable, the air outlet temperature of the passenger compartment eventually stabilized at around 10 degrees, and the head temperature of the driver and co-driver eventually stabilized at 25 degrees.

[0048] During the precooling process, the battery takes up part of the cooling capacity, which will affect the thermal comfort of the passenger compartment to a certain extent. However, the air conditioning system will feedback and adjust the compressor speed according to the thermal comfort of the passenger compartment in real time, and control the EXV opening according to the target superheat on the chiller side, so that the thermal comfort requirements of the passenger compartment can still be met in the end.

[0049] In this embodiment, the method identifies the driving scene before super-fast charging and activates the pre-cooling function through the interaction between the user and the navigation map system 400. This enables the function to be activated only in specific scenes, that is, to avoid triggering this function in other scenes, which reduces the energy consumption of the whole vehicle to a certain extent and avoids energy being wasted. According to the test results of the summer calibration test, it takes about 55 minutes for the battery to cool from 35 degrees to 25 degrees, and the battery pre-cooling consumes 1.68 kWh of electricity.

[0050] Please see Figure 2 , Figure 2 A system flow diagram of a power battery fast charging precooling control system is shown. Based on the above power battery fast charging precooling control system, the method may include the following steps:

[0051] S101, BMS confirms whether the user needs to go to a high-power charging pile according to the nearest charging station travel point information sent by the navigation map system. If yes, execute step S102; if not, end this process.

[0052] S102, the BMS calculates the remaining SOC to reach the nearest high-power charging station based on the remaining time to reach the nearest high-power charging station, the remaining mileage and the vehicle power consumption information.

[0053] S103 . The BMS calculates the required battery temperature to reach the nearest high-power charging pile based on the remaining SOC to reach the nearest high-power charging pile.

[0054] S104. The BMS determines whether early cooling is required based on the required battery temperature and the current battery temperature. If so, step S105 is executed; if not, the process ends.

[0055] S105 , the BMS sends the battery cooling request and the battery requested target flow rate to the VCU, and simultaneously sends the battery requested target water temperature to the VCU and HVAC.

[0056] S106. The VCU sends the battery fast cooling flag to the HVAC, switches the temperature control system to the fast cooling mode, and requests the water pump to work according to the battery target flow.

[0057] S107, HVAC adjusts the compressor speed according to the battery cooling demand and adjusts the electronic expansion valve on the chiller side according to the target superheat;

[0058] S108. The BMS determines whether it is necessary to exit cooling according to the current battery temperature and the current battery SOC. If so, execute step S109; if not, execute step S105.

[0059] S109. The BMS no longer sends a battery cooling request to the VCU.

[0060] S110, VCU sets the battery quick cooling flag to zero and switches the temperature control system to exit the quick cooling mode.

[0061] S111, HVAC closes the electronic expansion valve on the chiller side.

[0062] In this embodiment, the method is implemented based on the battery management system, the vehicle controller for the vehicle thermal management system, and the air-conditioning controller for the refrigerant system.

[0063] In this embodiment, the above-mentioned user and vehicle interact with each other through the navigation map system can be replaced by: the user directly sets whether to go to the high-power charging pile through the soft key on the AVNT

[0064] In this embodiment, when the remaining power of the battery is low, a pre-cooling function can also be developed to prepare for subsequent high-power fast charging.

[0065] It can be seen that the implementation of the power battery fast charging precooling control system described in this embodiment can significantly shorten the charging time and ensure as much as possible that the charging rate is not reduced due to battery overheating in high-temperature charging conditions.

[0066] An embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to perform linkage control on the power battery fast charging and pre-cooling control system in the embodiment of the present application.

[0067] An embodiment of the present application provides a computer-readable storage medium storing computer program instructions. When the computer program instructions are read and executed by a processor, the processor performs linkage control on the power battery fast charging and pre-cooling control system in the embodiment of the present application.

[0068] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0069] In addition, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0070] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0071] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0072] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0073] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A power battery fast charging precooling control system, characterized in that: The power battery fast charging and precooling control system includes a navigation map system, a vehicle controller, an air conditioning system controller and a battery management system, wherein: The navigation map system is used to obtain the travel point information set by the user on the map, the remaining time to reach the nearest charging station travel point, and the remaining mileage to reach the nearest charging station travel point; The vehicle controller is used to receive the battery cooling request, the battery requested target flow rate and the battery requested target water temperature sent by the battery management system, and send the vehicle power consumption information to the battery management system; The battery management system is used to calculate the remaining SOC to reach the nearest charging station travel point according to the remaining time, the remaining mileage and the vehicle power consumption information; and intelligently determine the required battery temperature, and predict the implementation time of requesting activation of the precooling function according to the current battery temperature and the battery temperature drop rate; The vehicle controller is further used to send a battery fast cooling flag to the air conditioning system controller; The air conditioning system controller is used to control the compressor and the electronic expansion valve on the refrigerant side to perform corresponding cooling work when receiving the battery fast cooling flag; The vehicle controller is further used to switch the temperature control system to the fast cooling mode, and control the water pump to work according to the battery request target flow; when the battery management system determines that it is necessary to exit the cooling mode, the battery fast cooling flag is set to 0, and the temperature control system is switched to exit the fast cooling mode; The battery management system is also used to obtain the current battery temperature of the power battery, the remaining mileage to the nearest charging station travel point, the remaining time to the nearest charging station travel point and the vehicle power consumption information when receiving the fast charging intention input by the user; and calculate the remaining SOC to the nearest charging station travel point based on the remaining mileage, the remaining time and the vehicle power consumption information; and based on the remaining SOC, intelligently optimize the optimal temperature to the nearest charging station travel point; based on the optimal temperature, the current temperature of the battery, the battery temperature drop rate and the remaining time, intelligently determine whether the battery pre-cooling function needs to be activated; if so, send a battery cooling request, a battery request target flow rate and a battery request target water temperature to the vehicle controller, and send the battery request target water temperature to the air-conditioning system controller.

2. The power battery fast charging precooling control system according to claim 1, characterized in that: The air conditioning system controller is further configured to close the electronic expansion valve on the refrigerant side of the battery cooler when it is determined that the battery quick cooling flag position is 0.

3. The power battery fast charging precooling control system according to claim 1, characterized in that: The air conditioning system controller is specifically used to receive the battery requested target water temperature; and when receiving the battery fast cooling flag, adjust the compressor speed according to the battery requested target water temperature; and obtain the target superheat, and adjust the electronic expansion valve on the refrigerant side of the battery cooler according to the target superheat.

4. The power battery fast charging precooling control system according to claim 1, characterized in that: The battery management system is also used to obtain the current battery temperature; determine whether to exit the fast cooling mode according to the current battery temperature and the target battery temperature; if so, no longer send a battery cooling request to the vehicle controller.

5. The power battery fast charging precooling control system according to claim 1, characterized in that: The battery management system is further used to obtain the current remaining power of the power battery; and to determine whether the current remaining power is higher than a preset power threshold; If yes, a battery cooling request, a battery requested target flow rate and a battery requested target water temperature are sent to the vehicle controller, and the battery requested target water temperature is sent to the air conditioning system controller.

6. An electronic device, characterized in that: The electronic device includes a memory and a processor, the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to perform linkage control on the power battery fast charging and pre-cooling system according to any one of claims 1 to 5.

7. A readable storage medium, characterized in that: The readable storage medium stores computer program instructions. When the computer program instructions are read and executed by a processor, the processor performs linkage control on the power battery fast charging and precooling system according to any one of claims 1 to 5.

Images