An electric vehicle charging thermal management power distribution control method, system and device

Abstract

The application relates to a power distribution control method, system and device for electric vehicle charging heat management, and relates to the technical field of electric vehicle charging power management, which is applied to the heat management power demand existing in electric vehicle charging and comprises the following steps: acquiring the maximum output power of a charging pile; acquiring a heat management demand power; and distributing the power of a heat management system and the power of a charging system based on the maximum output power and the heat management demand power. The application has the beneficial effect of reasonably distributing and controlling the power of an electric cell and the power of a heat management system in the electric vehicle charging process.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging power management technology, and in particular to a method, system and device for electric vehicle charging thermal management power distribution control. Background Technology

[0002] AC charging for electric vehicles utilizes an onboard charger to convert the AC power supplied by the AC charging station into DC power to supply the battery cells and various loads within the vehicle. However, due to the electrochemical properties of the battery cells, excessively high or low cell temperatures can affect charging performance and may even prevent the cells from charging properly.

[0003] AC charging piles generally provide relatively low power, while the power consumption of thermal management systems is related to ambient temperature, occupant set temperature, vehicle temperature, and battery cell temperature, and the power demand is usually relatively high.

[0004] When a vehicle is being AC charged, how to utilize the limited power supply of the battery cells and rationally allocate the power of the battery cell charging and thermal management system becomes the key to improving the user experience. Summary of the Invention

[0005] In order to rationally allocate and control the charging power of the battery cells and the power of the thermal management system during the charging process of electric vehicles, the present invention provides a method and device for allocating and controlling the thermal management power of electric vehicle charging.

[0006] In a first aspect, the present invention provides a power distribution control method for thermal management of electric vehicle charging, which adopts the following technical solution:

[0007] A power allocation control method for thermal management during electric vehicle charging, applicable to electric vehicles that have thermal management power requirements during charging, includes:

[0008] Obtain the maximum output power of the charging pile;

[0009] Obtain the required power for thermal management;

[0010] The power of the thermal management system and the power of the charging system are allocated based on the maximum output power and the power required for thermal management.

[0011] Furthermore, the above-mentioned electric vehicle charging thermal management power distribution control method also includes:

[0012] The cell temperature is obtained and the maximum output power is pre-allocated based on the cell temperature to control the cell temperature to a preset temperature range.

[0013] Furthermore, in the above-mentioned electric vehicle charging thermal management power allocation control method, the step of acquiring the cell temperature and pre-allocating the maximum output power based on the cell temperature to control the cell temperature to a preset temperature range includes:

[0014] Obtain the temperature of electric vehicle battery cells;

[0015] When the cell temperature exceeds the preset temperature range, the maximum output power is allocated to the thermal management system to control the cell temperature.

[0016] When the cell temperature is within a preset temperature range, the maximum output power is allocated to the thermal management system and the charging system for cell charging and vehicle thermal management.

[0017] Furthermore, in the above-mentioned electric vehicle charging thermal management power distribution control method, obtaining the maximum output power of the charging pile includes:

[0018] After charging begins, the thermal management device gradually increases the heat request power.

[0019] Obtain the cell current;

[0020] When the cell current is positive for the first time, the thermal request power of the thermal management device at the previous moment is taken as the maximum output power of the charging pile.

[0021] A positive cell current indicates that the battery is in a discharge state.

[0022] Furthermore, in the above-mentioned electric vehicle charging thermal management power distribution control method, the thermal management power demand includes the battery thermal power demand and the passenger compartment power demand.

[0023] Furthermore, in the above-mentioned electric vehicle charging thermal management power distribution control method, the battery thermal demand power is determined by the ambient temperature and the cell temperature.

[0024] Furthermore, in the above-mentioned electric vehicle charging thermal management power distribution control method, the passenger compartment demand power includes the passenger compartment thermal demand power and the passenger compartment defrosting and defogging demand power.

[0025] The thermal power demand of the passenger cabin is determined based on factors such as ambient temperature, passenger cabin temperature, and passenger set temperature.

[0026] The power requirement for defrosting and defogging the passenger cabin is determined based on the compressor power.

[0027] Furthermore, in the above-mentioned electric vehicle charging thermal management power allocation control method, the power allocation of the thermal management system and the charging system based on the maximum output power and the thermal management demand power includes:

[0028] The charging power requirement is determined based on the maximum output power.

[0029] The total power demand is determined based on the thermal management power demand, the charging power demand, and the preset DC / DC conversion power.

[0030] When the maximum output power meets the total power demand, the maximum output power will allocate the remaining power to charge the battery cells after meeting the thermal management power demand.

[0031] When the maximum output power is lower than the total power demand, the maximum output power is allocated to the thermal management system while still meeting the charging power demand.

[0032] Furthermore, in the above-mentioned electric vehicle charging thermal management power distribution control method, the thermal management system includes a heat pump management subsystem and a PTC management subsystem;

[0033] The maximum output power allocated to the thermal management system, based on meeting the charging demand, includes:

[0034] The power allocated to the thermal management system is preferentially allocated to the heat pump management subsystem;

[0035] After allocating power to the heat pump management subsystem, the remaining power is allocated to the PTC management subsystem.

[0036] Secondly, the present invention provides a power distribution control system for electric vehicle charging thermal management, which adopts the following technical solution:

[0037] An electric vehicle charging thermal management power distribution control system includes:

[0038] The maximum output power acquisition module is used to acquire the maximum output power of the charging pile during charging.

[0039] The thermal management power demand acquisition module is used to acquire the thermal management power demand of the thermal management system.

[0040] The power distribution module distributes the power of the thermal management system based on the method described in any one of the above techniques.

[0041] Furthermore, the aforementioned electric vehicle charging thermal management power distribution control system also includes:

[0042] The cell temperature control module is used to control the cell temperature to a preset temperature range using the maximum output power before the cell is charged.

[0043] Thirdly, the present invention provides a charging device, which adopts the following technical solution:

[0044] A charging device, the charging device comprising the electric vehicle charging thermal management power distribution control system described above.

[0045] Fourthly, the present invention provides a vehicle that adopts the following technical solution:

[0046] A vehicle that includes a charging device as described in the above-described technology.

[0047] Fifthly, the present invention provides a readable storage medium, which adopts the following technical solution:

[0048] A computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the electric vehicle charging thermal management power distribution control method described in any one of the above-described technologies.

[0049] In summary, the present invention has at least one of the following beneficial technical effects:

[0050] 1. When thermal management is required during the charging process of electric vehicles, this invention dynamically obtains the maximum output power of the charging pile and the thermal management power required during the charging process of the vehicle, and reasonably allocates the maximum output power to the charging system and the thermal management system, so as to achieve the purpose of allocating and controlling the charging power of the battery cells and the power of the thermal management system during the charging process of electric vehicles.

[0051] 2. The purpose of adjusting the cell temperature to the optimal charging range before charging is to protect the cell temperature, thereby helping to improve the cell's lifespan;

[0052] 3. This invention is applicable to AC charging piles with different output power, and solves the problems in the existing technology caused by unreasonable power distribution during AC charging, such as battery cell discharge, poor thermal management comfort, excessive thermal management power fluctuation, and impact on charging speed, which can damage the on-board charger. Ultimately, it improves the user experience. Attached Figure Description

[0053] Figure 1 This is a flowchart of an embodiment of the electric vehicle charging thermal management power distribution control method of the present invention.

[0054] Figure 2 This is a flowchart of another embodiment of the electric vehicle charging thermal management power distribution control method of the present invention.

[0055] Figure 3 This is a flowchart of another embodiment of the electric vehicle charging thermal management power distribution control method of the present invention.

[0056] Figure 4 This is a flowchart of another embodiment of the electric vehicle charging thermal management power distribution control method of the present invention.

[0057] Figure 5 This is a flowchart of another embodiment of the electric vehicle charging thermal management power distribution control method of the present invention.

[0058] Figure 6 This is a flowchart of another embodiment of the electric vehicle charging thermal management power distribution control method of the present invention.

[0059] Figure 7 This is a flowchart of another embodiment of the electric vehicle charging thermal management power distribution control method of the present invention. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] The method steps described in this embodiment of the invention can be executed in the order described in the specific implementation, or the execution order of each step can be adjusted according to actual needs, provided that the technical problem can be solved. These are not listed one by one here.

[0062] The following is in conjunction with the appendix Figure 1-7 The present invention will be described in further detail below.

[0063] This invention discloses a power allocation control method for thermal management during electric vehicle charging, applicable to situations where thermal management is required during electric vehicle charging. (Refer to...) Figure 1 A power distribution control method for electric vehicle charging thermal management, comprising:

[0064] S1, obtain the maximum output power of the charging pile. The specific maximum output power is represented by P. piple express;

[0065] S2, obtain the thermal management power requirement. Specifically, the thermal management power requirement is represented by P. thermo express;

[0066] S3, based on the maximum output power P piple With the thermal management required power P thermo Distribute the power of the thermal management system and the power of the charging system.

[0067] When thermal management is required during electric vehicle charging, this invention addresses the thermal management needs of charging piles with different output powers and different vehicles during charging. In steps S1 and S2, the maximum output power P of the charging pile is obtained respectively. piple Power P required for thermal management during vehicle charging thermo In step S3, the maximum output power P piple The power is rationally allocated to the charging system and the thermal management system to achieve the purpose of distributing and controlling the charging power of the battery cells and the power of the thermal management system during the charging process of electric vehicles.

[0068] Furthermore, refer to Figure 2 As a specific embodiment of the present invention, a power distribution control method for electric vehicle charging thermal management further includes:

[0069] S4, acquire the cell temperature and pre-allocate the maximum output power P based on the cell temperature. piple To control the temperature of the battery cell to a preset temperature range.

[0070] When the maximum output power P piple Before allocating power to the charging system, the present invention pre-obtains the battery cell temperature in step S4. When the cell temperature is outside the optimal range for battery charging temperature, the maximum output power P of the charging pile is first increased. piple The energy is allocated to the thermal management system to regulate the cell temperature to the optimal charging range. Step S4 can perform battery temperature protection before charging the battery, thereby helping to improve battery life.

[0071] Furthermore, as a specific embodiment of the present invention, refer to... Figure 3 Step S4 includes:

[0072] S41, obtain the temperature of the electric vehicle's battery cells, specifically from the battery's built-in cell temperature sensor;

[0073] S42, when the cell temperature exceeds the preset temperature range, the maximum output power is allocated to P. piple A thermal management system is used to control the temperature of the battery cells;

[0074] S43, when the cell temperature is within a preset temperature range, the maximum output power is allocated to the thermal management system and the charging system for battery charging and vehicle thermal management.

[0075] Specifically, the temperature range can be set to -16°C to 10°C. When the cell temperature is below -16°C, step S42 allocates the maximum output power P. pipleThe PTC heating module in the thermal management system. In practical applications, considering the power consumed by AC / DC current conversion and safety settings, the actual value allocated to the PTC heating module in the thermal management system is P. baHt = P piple - P trans - P safeop Among them, P baHt P represents the heating power required by the PTC module in the thermal system when the battery cell is below extremely low temperatures (-16°C). trans P represents the DC-DC conversion power of the AC-DC converter. safeop This is a safe value.

[0076] When the maximum output power P piple After all power is allocated to the PTC module in the thermal system, the cell temperature rises to a preset range before charging begins, and the maximum output power P is reached. piple It is allocated to the thermal management system and charging system for battery charging and vehicle thermal management.

[0077] Obtain the maximum output power P of the charging pile piple There are many ways to do this. In some implementations, the model of the charging pile can be directly obtained by identifying the device to read the maximum output power P of the charging pile. piple In some other implementations, the maximum output power P piple The information can also be manually entered by the driver.

[0078] In some other specific embodiments, refer to Figure 4 and Figure 5 Step S1 obtains the maximum output power P piple The method includes the following steps:

[0079] S11, after charging begins, utilizes thermal management equipment to progressively increase the heat request power.

[0080] S12, obtain the cell current;

[0081] S13, when the cell current is positive for the first time, the heat request power of the thermal management device at the previous moment is taken as the maximum output power of the charging pile; wherein the positive cell current indicates that the battery is in a discharge state.

[0082] In actual charging processes, the diversity of charging pile models and the fluctuation of AC power make it difficult to obtain an accurate maximum output power P simply by identifying the device or directly inputting the power. pipleIn step S11, after the vehicle is connected to the charging device and charging begins, the PTC or compressor in the thermal management equipment gradually increases the requested heat power. Initially, the thermal management equipment requires less power to generate sufficient charging current. As the requested heat power increases, the charging current gradually decreases.

[0083] Step S12 reads the cell current within the battery using a current reading device. During battery charging, the cell current is negative; during battery discharging, the cell current is positive. As the thermal power demand increases, in step S13, when the cell current first becomes positive, it indicates the maximum output power P. piple The battery has been fully utilized to meet the power demand, and discharge has occurred. Therefore, the power demand at the previous moment can be determined as the maximum output power of the charging station. Automatically reading the power demand at that moment will accurately yield the maximum output power P of the charging station. piple .

[0084] Furthermore, as a specific embodiment of the present invention, the thermal management power requirement P thermo This includes the power demand for battery thermal operation and the power demand for the passenger cabin. The power demand for the passenger cabin further includes the power demand for passenger cabin thermal operation and the power demand for passenger cabin defrosting and defogging.

[0085] The battery thermal power demand is determined based on the ambient temperature and the cell temperature. Specifically, as an embodiment of the present invention, the correspondence between the battery thermal power demand, ambient temperature, and cell temperature is as follows:

[0086] When the cell temperature is between -16℃ and 10℃: 1. Under extremely low ambient temperatures (below -16℃), the cell's thermal power demand P baHt = 500W; 2. Under low ambient temperature (-16℃ to -10℃), the thermal power demand P of the battery cell baHt =400W; 3. Under low ambient temperature (-10℃ to 10℃), the thermal power demand P of the battery cell is... baHt = 300W; 4. Under normal ambient temperature (greater than 10℃), the thermal power demand P of the battery cell is... baHt = 200W.

[0087] When the cell temperature is greater than 10℃, regardless of the ambient temperature, the cell's thermal power demand P baHt = 0.

[0088] The above embodiment only represents one relationship between the thermal power demand of the battery cell and the ambient temperature and battery cell temperature. In other embodiments, the relationship between the thermal power demand of the battery cell and the ambient temperature and battery cell temperature can also be adjusted to meet the thermal power demand P of the battery cell. baHt= f(ambient temperature, cell temperature) can be used.

[0089] It should also be noted that at the boundaries of the aforementioned adjacent temperature ranges (such as -16℃, -10℃, and 10℃), a hysteresis range needs to be set to prevent the thermal power demand P of the battery cell caused by temperature fluctuations. baHt Frequent changes.

[0090] Furthermore, the passenger cabin thermal demand power is determined based on the ambient temperature, passenger cabin temperature, and passenger set temperature. Specifically, as one implementation method, the passenger cabin thermal demand power P cabinHt = K1 × Ambient Temperature + K2 × Passenger Cabin Temperature + K3 × Set Temperature, where K1, K2, and K3 are the power P that affects the passenger cabin's heat demand, respectively, based on the ambient temperature, passenger cabin temperature, and set temperature. cabinHt The weighting coefficients.

[0091] The above embodiment only represents one correspondence between the passenger cabin thermal demand power and the ambient temperature, passenger cabin temperature, and passenger set temperature. In other embodiments, the correspondence between the passenger cabin thermal demand power and the ambient temperature, passenger cabin temperature, and passenger set temperature can also be adjusted to meet the passenger cabin thermal demand power P. cabinHt = f(ambient temperature, passenger cabin temperature, passenger set temperature) can be used.

[0092] Furthermore, the power requirement for defrosting and defogging the passenger compartment is determined based on the compressor power. Specifically, in some embodiments, the power requirement P for defrosting and defogging the passenger compartment is... cabinDef = P CMPSR +P safeop , where P CMPSR P represents the operating power of the compressor in a heat pump thermal management system. safeop This is a safe value. In some other embodiments, the power P required for passenger compartment defrosting and defogging is... cabinDef =σ×P CMPSR Where σ is the safety factor. The relationship between the power required for defrosting and defogging the passenger cabin and the compressor power is not specifically limited, provided that P... cabinDef = f(compressor power) can be used.

[0093] Furthermore, in one specific embodiment of the present invention, the thermal management power requirement is the sum of three power requirements: battery thermal power requirement, passenger cabin thermal power requirement, and passenger cabin defrosting and defogging power requirement, i.e., P. thermo = P baHt +P cabinHt +P cabinDef .

[0094] Furthermore, as a specific embodiment of the present invention, refer to... Figure 6Step S3 includes:

[0095] S31, based on maximum output power P piple Determine the charging power requirement, where the charging power requirement is denoted by P. bacharg Indication. Specifically, in this embodiment, P bacharg = α×P piple , where α is the allocation factor, preferably 30%, but can also be adjusted;

[0096] S32, based on the thermal management power requirement P thermo The charging power requirement P bacharg and the preset DC / DC conversion power P trans Determine the total power demand. Specifically, the total power demand is expressed in P. sum Indication. As one implementation method, P sum =P thermo +P bacharg +P trans ;

[0097] S33, when the maximum output power P piple To meet the total power demand P sum That is, P piple >P sum At that time, the maximum output power P piple To meet the thermal management requirements, power P thermo Based on this, the remaining power is allocated to charge the battery cells. Specifically, the thermal management allocation power allocated to the thermal management system is set to P. thTot That is, when P piple >P sum At that time, the thermal management power distribution P thTot = P thermo Residual power (P) piple - P thTot ) allocated to the charging system;

[0098] S34, when the maximum output power P piple Below the total power demand P sum That is, P piple <P sum At that time, the maximum output power P piple To meet the charging demand power P bacharg Based on this, it is allocated to the thermal management system. That is, when P piple <P sum At that time, the thermal management power distribution P thTot = P piple -P bacharg -P safeop , where P safeop This is a safe value.

[0099] Furthermore, as a specific embodiment of the present invention, the thermal management system is divided into a heat pump management subsystem and a PTC management subsystem according to the thermal management method. The PTC management subsystem heats up quickly but consumes a lot of electricity. The heat pump management subsystem heats up slowly but is more energy-efficient. Therefore, when the battery cell is at extremely low temperatures (below -16°C), in order to charge the battery cell as quickly as possible and improve the charging speed, the maximum output power P of the charging pile is... piple Both are used for heating with PTC. However, during the charging process, especially the maximum output power P... piple If the power requirements of the charging system, the PCT thermal management system, and the heat pump thermal management system cannot be met simultaneously, then the maximum output power P needs to be adjusted. piple A certain allocation will be made.

[0100] Therefore, as a specific embodiment of the present invention, the maximum output power P in step S34 is... piple To meet the charging demand power P bacharg The allocation of power to the thermal management system includes: prioritizing the allocation of power to the heat pump management subsystem; and after allocating power to the heat pump management subsystem, allocating the remaining power to the PTC management subsystem.

[0101] Specifically, the heat pump allocation power distributed to the heat pump management subsystem is represented by P. EHP It means that P EHP = Min(P) thTot ,P cabinDef This function represents the situation where the thermal management power allocation is less than the power required for defrosting and defogging in the passenger cabin, i.e., P... thTot <P cabinDef At that time, the thermal management power P will be allocated. thTot All allocated to the heat pump management subsystem, i.e., P EHP = P thTot When the thermal management power allocation exceeds the power required for defrosting and defogging in the passenger cabin, i.e., P... thTot >P cabinDef At that time, the thermal management power distribution P thTot First, meet the power requirements of the heat pump management subsystem, i.e., the heat pump power distribution P. EHP = P cabinDef The remaining power is then allocated to the PTC management subsystem, i.e., the PCT allocated power P. PTC = P thTot -P cabinDef -P safeop , where P safeop This is a safe value.

[0102] The implementation principle of an embodiment of the electric vehicle charging thermal management power distribution control method of the present invention is as follows: (Refer to...) Figure 7 When the vehicle enters AC charging mode and has thermal management requirements:

[0103] First, obtain the maximum output power P of the charging pile. piple Thermal management power requirement P thermo Among them, the thermal management power requirement P thermo Battery thermal demand power P baHt Passenger cabin thermal demand power P cabinHt And the power P required for defrosting and defogging in the passenger cabin cabinDef Determined, i.e., P thermo = P baHt +P cabinHt +P cabinDef .

[0104] Simultaneously, by measuring the battery cell temperature, when the battery cell temperature exceeds the preset temperature range, the maximum output power P of the charging pile will be reduced. piple All are allocated to the thermal management system to regulate the cell temperature to a preset range.

[0105] Once the battery cell temperature is within the preset temperature range, determine the maximum output power P of the charging pile. piple All of them can meet the total power demand P sum If the total power demand P can be met sum Then, at the maximum output power P of the charging pile piple Power P meets thermal management requirements thermo Afterwards, the remaining power is allocated to the charging system.

[0106] When the maximum output power P of the charging pile piple The total power demand P cannot be met sum At that time, the maximum output power P piple The power is first allocated to the charging system, and after the charging system is fully allocated, the remaining power is allocated to the thermal management system.

[0107] Meanwhile, when allocating power to the thermal management system, power is preferentially allocated to the heat pump management subsystem. After being allocated to the heat pump management subsystem, the remaining power is finally allocated to the PCT management subsystem.

[0108] This invention is applicable to AC charging piles with different output power, and solves the problems in the existing technology caused by unreasonable power distribution during AC charging, such as battery discharge, poor thermal management comfort, excessive thermal management power fluctuation, and impact on charging rate, which can damage the on-board charger. Ultimately, it improves the user experience.

[0109] Based on the electric vehicle charging thermal management power distribution control method disclosed in the above embodiments, the present invention also discloses an electric vehicle charging thermal management power distribution control system.

[0110] An electric vehicle charging thermal management power distribution control system includes a maximum output power acquisition module, a thermal management demand power acquisition module, a cell temperature control module, and a power distribution module.

[0111] The maximum output power acquisition module is used to obtain the maximum output power of the charging pile during charging.

[0112] The thermal management power demand acquisition module is used to acquire the thermal management power demand of the thermal management system.

[0113] The power distribution module is used to distribute the power of the thermal management system based on the method described in any of the above embodiments.

[0114] The cell temperature control module is used to control the cell temperature to a preset temperature range using the maximum output power before the cell is charged.

[0115] Specifically, in one embodiment of the present invention, the maximum output power acquisition module includes a thermal management device control unit, a cell current reading unit, and an output power determination unit. The thermal management device control unit controls the thermal management device to progressively increase the requested heat power. The cell current reading unit acquires the cell current. The output power determination unit determines the maximum output power based on the requested heat power and the cell current.

[0116] Specifically, as a specific embodiment of the present invention, the thermal management demand power acquisition module includes a battery thermal demand power acquisition unit, a passenger compartment thermal demand power acquisition unit, and a passenger compartment defrosting and defogging demand power acquisition unit. The battery thermal demand power acquisition unit determines the battery thermal demand power based on the ambient temperature and the battery cell temperature. The passenger compartment thermal demand power acquisition unit determines the passenger compartment thermal demand power based on the ambient temperature, the passenger compartment temperature, and the passenger set temperature. The passenger compartment defrosting and defogging demand power acquisition unit determines the passenger compartment defrosting and defogging demand power based on the compressor power in the heat pump management subsystem.

[0117] Specifically, as a specific embodiment of the present invention, the power distribution module has a built-in logic language corresponding to any of the above-mentioned embodiments of the electric vehicle charging thermal management power distribution control method, which is used to distribute the maximum output power of the charging pile based on the logic language.

[0118] This invention also provides a charging device that can be built into an electric vehicle, the charging device being equipped with an electric vehicle charging thermal management power distribution control system as described in the above embodiments.

[0119] This invention also provides a vehicle equipped with a charging device as described in the above embodiments.

[0120] This invention also discloses a computer-readable storage medium.

[0121] A computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the electric vehicle charging thermal management power distribution control method described above. The computer-readable storage medium may include any entity or device capable of carrying a computer program, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), and a software distribution medium, etc. The computer program includes computer program code. The computer program code may be in the form of source code, object code, an executable file, or some intermediate form, etc. The computer-readable storage medium may include any entity or device capable of carrying computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), and a software distribution medium, etc.

[0122] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0123] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus or device (such as a computer-based system, a system including a processing module or other system that can fetch and execute instructions from, an instruction execution system, apparatus or device).

[0124] The method steps described in this embodiment of the invention can be executed in the order described in the specific implementation, or the execution order of each step can be adjusted according to actual needs, provided that the technical problem can be solved. These are not listed one by one here.

[0125] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for thermal management power allocation control during electric vehicle charging, applicable to electric vehicles that have thermal management power requirements during charging, characterized in that... include: Obtaining the maximum output power of the charging pile includes: after charging starts, using the thermal management device to gradually increase the output power in a stepwise manner; obtaining the cell current; when the cell current is positive for the first time, taking the thermal request power of the thermal management device at the previous moment as the maximum output power of the charging pile; wherein a positive cell current indicates that the cell is in a discharging state. Obtain the required power for thermal management; The power of the thermal management system and the power of the charging system are allocated based on the maximum output power and the power required for thermal management, including: The charging power requirement is determined based on the maximum output power. The total power demand is determined based on the thermal management power demand, the charging power demand, and the preset DC / DC conversion power. When the maximum output power meets the total power demand, the maximum output power will allocate the remaining power to charge the battery cells after meeting the thermal management power demand. When the maximum output power is lower than the total power demand, the maximum output power is allocated to the thermal management system while still meeting the charging power demand. The thermal management system includes a heat pump management subsystem and a PTC management subsystem. The maximum output power allocated to the thermal management system, based on meeting the charging demand, includes: The power allocated to the thermal management system is preferentially allocated to the heat pump management subsystem; After allocating power to the heat pump management subsystem, the remaining power is allocated to the PTC management subsystem.

2. The electric vehicle charging thermal management power distribution control method according to claim 1, characterized in that, The method further includes: The cell temperature is obtained and the maximum output power is pre-allocated based on the cell temperature to control the cell temperature to a preset temperature range.

3. The electric vehicle charging thermal management power distribution control method according to claim 2, characterized in that, The step of acquiring the cell temperature and pre-allocating the maximum output power based on the cell temperature to control the cell temperature to a preset temperature range includes: Obtain the temperature of electric vehicle battery cells; When the cell temperature exceeds the preset temperature range, the maximum output power is allocated to the thermal management system to control the cell temperature. When the cell temperature is within a preset temperature range, the maximum output power is allocated to the thermal management system and the charging system for battery charging and vehicle thermal management.

4. The electric vehicle charging thermal management power distribution control method according to claim 1, characterized in that, The thermal management power requirement includes the battery cell thermal power requirement and the passenger cabin power requirement.

5. The electric vehicle charging thermal management power distribution control method according to claim 4, characterized in that, The thermal power requirement of the battery cell is determined based on the ambient temperature and the battery cell temperature.

6. The electric vehicle charging thermal management power distribution control method according to claim 4, characterized in that, The passenger cabin power requirement includes the passenger cabin thermal power requirement and the passenger cabin defrosting and defogging power requirement. The thermal power demand of the passenger cabin is determined based on the ambient temperature, the passenger cabin temperature, and the passenger's set temperature. The power requirement for defrosting and defogging the passenger cabin is determined based on the compressor power.

7. A power distribution control system for thermal management of electric vehicle charging, characterized in that, include: The maximum output power acquisition module is used to acquire the maximum output power of the charging pile during charging. The thermal management power demand acquisition module is used to acquire the thermal management power demand of the thermal management system. A power distribution module that distributes the power of the thermal management system based on the method described in any one of claims 1-6.

8. The electric vehicle charging thermal management power distribution control system according to claim 7, characterized in that, The system also includes: The cell temperature control module is used to control the cell temperature to a preset temperature range using the maximum output power before the cell is charged.

9. A charging device, characterized in that, The charging device includes the system as described in claim 7.

10. A vehicle, characterized in that, The vehicle includes the device as described in claim 9.

11. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, which, when executed by a processor, implements the steps of the method as described in any one of claims 1-6.

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