Electric vehicle plug-in gun heat preservation control method, electric vehicle, device and storage medium

Abstract

The application relates to the technical field of power battery temperature maintenance, and provides a control method for plug-in gun temperature maintenance of an electric vehicle, the electric vehicle, a device and a storage medium, which comprises the following steps: detecting the ambient temperature around a power battery and the temperature of each single battery in a power battery pack after slow charging is completed; determining whether to start the plug-in gun temperature maintenance function of the electric vehicle according to the ambient temperature and the temperature of the single battery; and controlling the temperature of the single battery in a set range through a cooling liquid after it is determined that the plug-in gun temperature maintenance function is started, so that the temperature of the power battery is maintained in the set range through the cooling liquid temperature maintenance mode after the slow charging is completed, and the capacity of the power battery and the cruising range of the electric vehicle are not reduced, and the battery attenuation and the reduction of the cruising range of the electric vehicle in winter are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power battery temperature maintenance, and in particular relates to a control method for maintaining the temperature of an electric vehicle charging gun, an electric vehicle, a device and a storage medium. BACKGROUND

[0002] The biggest technical bottleneck in the development of electric vehicles at present is the endurance and attenuation of power batteries, and the poor charging and discharging performance of the widely used lithium ion batteries under low temperature conditions is one of the main reasons for restricting the above problems. The lithium ion power batteries currently used on the market cannot be charged and discharged under cold working conditions (-40 DEG C). As the temperature decreases, the battery will have problems such as increased viscosity of the electrolyte, poor compatibility between the electrolyte and the internal separator and electrode, and significantly increased internal impedance of the battery, resulting in a significant decrease in the charging capacity of the battery and a significant deterioration in the discharging performance.

[0003] In winter, after the slow charging of the electric vehicle is completed, the power battery after charging is still affected by the cold due to the low outdoor temperature, resulting in a decrease in the battery capacity and thus affecting the endurance and driving range of the electric vehicle.

[0004] Therefore, how to maintain the temperature of the power battery within a suitable range after the slow charging of the electric vehicle is completed has become a technical problem to be solved. SUMMARY

[0005] The embodiments of the present application provide a control method for maintaining the temperature of an electric vehicle charging gun, an electric vehicle, a device and a storage medium, which are used to solve the technical problem that the temperature of the power battery cannot be maintained within a suitable range after the slow charging of the electric vehicle is completed.

[0006] In a first aspect, the present application provides a control method for maintaining the temperature of an electric vehicle charging gun, which comprises:

[0007] detecting the ambient temperature around the power battery pack and the temperature of each single battery in the power battery pack after the slow charging is completed;

[0008] determining whether to start the plug-in gun temperature maintenance function of the electric vehicle according to the ambient temperature and the temperature of the single battery;

[0009] controlling the temperature of the single battery within a set range by a cooling liquid after it is determined that the plug-in gun temperature maintenance function is started.

[0010] Optionally, determining whether to start the plug-in gun temperature maintenance function of the electric vehicle according to the ambient temperature and the temperature of the single battery comprises:

[0011] determining whether the ambient conditions for plug-in gun temperature maintenance are met according to the relationship between the ambient temperature and a preset ambient temperature range;

[0012] After determining that the environmental condition is reached, it is determined whether to start the gun insertion heat preservation function of the electric vehicle according to the relationship between the temperature of the single battery and the preset single battery temperature threshold.

[0013] Optionally, it is determined whether the environmental condition of gun insertion heat preservation is reached according to the relationship between the environmental temperature and the preset environmental temperature range, comprising:

[0014] When the environmental temperature is within the preset environmental temperature range, it is determined that the environmental condition of gun insertion heat preservation is reached;

[0015] Otherwise, the environmental condition of gun insertion heat preservation is not reached.

[0016] Optionally, it is determined whether to start the gun insertion heat preservation function of the electric vehicle according to the relationship between the temperature of the single battery and the preset single battery temperature threshold, comprising:

[0017] The temperature of each two single batteries in the power battery pack is difference operated to obtain the temperature difference of each two single batteries;

[0018] When all the temperature differences are less than or equal to the preset temperature difference threshold, it is further determined whether the temperature of each single battery in the power battery pack is outside the set range;

[0019] If the temperature of all single batteries is outside the set range, the gun insertion heat preservation function of the electric vehicle is started; otherwise, the gun insertion heat preservation function of the electric vehicle is not started.

[0020] Optionally, after it is determined to start the gun insertion heat preservation function, the temperature of the single battery is controlled within the set range by the cooling liquid, comprising:

[0021] When the temperature of the single battery is less than or equal to the lower limit value of the set range, the cooling liquid is heated, and each single battery in the power battery pack is indirectly heated by the heated cooling liquid until the temperature of all single batteries is increased to the set range;

[0022] When the temperature of the single battery is greater than or equal to the upper limit value of the set range, the cooling liquid is cooled, and the heat in the power battery pack is indirectly absorbed by the cooled cooling liquid until the temperature of the single battery is reduced to the set range.

[0023] In a second aspect, the present application provides an electric vehicle, comprising:

[0024] A sensor unit is configured to detect the environmental temperature around the power battery pack and the temperature of each single battery in the power battery pack;

[0025] A cooling liquid circulation passage is configured to accommodate a cooling liquid circulating to exchange heat with the single battery.

[0026] A vehicle-mounted controller is configured to collect the ambient temperature and the temperature of the single battery from the sensor unit, and determine whether to start a gun warming function of the electric vehicle according to the ambient temperature and the temperature of the single battery. When it is determined to start the gun warming function, the vehicle-mounted controller is configured to control the temperature of the cooling liquid to exchange heat with the single battery, so that the temperature of the single battery is controlled within a set range.

[0027] Optionally, the vehicle-mounted controller comprises:

[0028] A vehicle controller is configured to control the working state of the sensor unit, collect the ambient temperature and the temperature of the single battery, and determine whether to start the gun warming function. When it is determined to start the gun warming function, the vehicle controller is configured to send a gun warming request.

[0029] A battery management system is configured to receive the gun warming request sent by the vehicle controller, and send a preparation signal to an electronic control system and a corresponding temperature control signal to a thermal management system of the cooling liquid according to the gun warming request.

[0030] The electronic control system is configured to receive the preparation signal sent by the battery management system, and supply power to the thermal management system according to the preparation signal.

[0031] Optionally, the thermal management system comprises:

[0032] A heating unit is configured to heat the cooling liquid when the temperature control signal is a heating signal.

[0033] A cooling unit is configured to cool the cooling liquid when the temperature control signal is a cooling signal.

[0034] Optionally, the vehicle controller is further configured to detect the communication state among the sensor unit, the battery management system and the electronic control system, and the connection state of the gun of the electric vehicle.

[0035] When the communication among the sensor unit, the battery management system and the electronic control system is abnormal, or the connection state of the gun of the electric vehicle is not connected, the gun warming function of the electric vehicle is stopped.

[0036] In a third aspect, the application provides a control device for gun warming of an electric vehicle, which comprises:

[0037] A sensor module is configured to detect the ambient temperature around the power battery pack and the temperature of each single battery in the power battery pack after slow charging is completed.

[0038] The plug-in insulation control module is used to determine whether to activate the plug-in insulation function of the electric vehicle based on the ambient temperature and the temperature of the individual battery cell.

[0039] The heating circulation module is used to control the temperature of the individual battery cells within a set range using coolant after the insertion gun insulation function is activated.

[0040] Fourthly, this application provides a device for controlling the heat preservation of an electric vehicle plug, the device comprising:

[0041] Memory, used to store program instructions;

[0042] A processor is configured to invoke program instructions stored in the memory and execute the method described in any of the first aspects according to the obtained program instructions.

[0043] Fifthly, embodiments of this application provide a storage medium storing computer-executable instructions for causing a computer to implement the method as described in any of the first aspects.

[0044] The technical solution in this application embodiment has the following beneficial effects: After slow charging is completed, the ambient temperature around the power battery pack and the temperature of each individual battery cell in the power battery pack are detected; based on the ambient temperature and the temperature of the individual battery cells, it is determined whether to activate the electric vehicle's plug-in heat preservation function; after determining to activate the plug-in heat preservation function, the temperature of the individual battery cells is controlled within a set range by the coolant, thereby maintaining the power battery temperature within the set range by the coolant heat preservation method after slow charging is completed, and without using the power battery's own electrical energy, ensuring that the capacity of the power battery and the driving range of the electric vehicle will not decrease, reducing the battery degradation and driving range reduction in winter driving. Attached Figure Description

[0045] Figure 1 This is a flowchart of a control method for heat preservation of electric vehicle plug guns provided in an embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the structure of a control system for heat preservation of electric vehicle plugs provided in an embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of the structure of an electric vehicle plug-in insulation system provided in an embodiment of the present invention;

[0048] Figure 4 This is a schematic diagram of the structure of an electric vehicle provided in an embodiment of the present invention;

[0049] Figure 5This is a schematic diagram of the structure of a control device for heat preservation of electric vehicle plugs provided in an embodiment of the present invention. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0051] In existing technologies, traditional battery preheating systems typically operate during vehicle discharge and charging, primarily addressing the reduction in battery capacity and driving range caused by excessively low battery temperatures during these processes. However, the range and performance degradation issues of electric vehicle power batteries in cold winter conditions are usually addressed through battery preheating and vehicle heating functions that consume the battery's own power. Clearly, these functions all require battery power, effectively reducing the electric vehicle's driving range.

[0052] This invention provides a control method for heat preservation of electric vehicle charging port, an electric vehicle, a device, and a storage medium, which solves the technical problem of not being able to maintain the temperature of the power battery within a suitable range after the electric vehicle has finished slow charging.

[0053] The technical solutions provided by the embodiments of this application are described below with reference to the accompanying drawings.

[0054] Please see Figure 1 This invention provides a control method for heat preservation of electric vehicle plug guns, the method comprising:

[0055] 101. After slow charging is completed, check the ambient temperature around the power battery pack and the temperature of each individual battery cell in the power battery pack.

[0056] 102. Determine whether to activate the electric vehicle's plug-in insulation function based on the ambient temperature and the temperature of the individual battery cells.

[0057] 103. After confirming the activation of the battery insertion gun insulation function, the temperature of the individual battery cells is controlled within the set range by the coolant.

[0058] For example, see Figure 2 , Figure 2The schematic diagram of a control system for heat preservation of electric vehicle plugs provided in this application embodiment includes a sensor unit 21, a vehicle control unit (VCU) 22, a battery management system (BMS) 23, and a high-voltage electronic control system (Conversion & Distribution Unit, CDU) 24. The preset ambient temperature range is -35℃ to -5℃, the preset temperature difference threshold is 10℃, and the temperature setting range of the individual cells in the power battery pack is greater than 35℃.

[0059] After the electric vehicle finishes slow charging, sensor unit 21 begins to collect the ambient temperature and the temperature of each individual cell in the power battery pack. At this time, the ambient temperature is -10℃, the maximum temperature difference between individual cells is 2℃, and the temperature of the cell with the highest temperature is -5℃. Sensor unit 21 sends the ambient temperature of -10℃, the temperature difference between individual cells of 2℃, and the temperature of the cell with the highest temperature of -5℃ to VCU22.

[0060] After receiving the temperature data sent by the sensor unit 21, VCU22 compares the ambient temperature of -10℃ with the preset ambient temperature range of -35℃ to -5℃ to determine that the current ambient temperature is within the preset range; it compares the maximum temperature difference of 2℃ between each individual battery cell with the preset temperature difference threshold of 10℃ to confirm that the temperature difference between the current individual batteries does not exceed the preset temperature difference threshold; it compares the temperature of the hottest individual battery cell (-5℃) with the preset temperature setting range to determine that the temperature of all individual batteries in the current power battery pack does not exceed the setting range; therefore, VCU22 determines to activate the plug-in heat preservation function.

[0061] Once VCU22 determines that the plug-in insulation function is activated, it sends a plug-in insulation request to BMS23. BMS23 then sends a heating request to CDU24 based on this request. Upon receiving the heating request, CDU24 supplies power to the coolant circulation path and heating unit. The coolant circulation path delivers the heated coolant to the battery pack, indirectly heating each individual cell within the battery pack, ensuring that the temperature of all individual cells rises to the set range.

[0062] The technical solution in this application embodiment has the following beneficial effects: After slow charging is completed, the ambient temperature around the power battery and the temperature of each individual cell in the power battery pack are detected; based on the ambient temperature and the temperature of the individual cells, it is determined whether to activate the plug-in heat preservation function of the electric vehicle; after determining to activate the plug-in heat preservation function, the temperature of the individual cells is controlled within a set range by the coolant, so that after slow charging is completed, the temperature of the power battery is maintained within the set range by the coolant heat preservation method, and the power battery itself does not use its own electrical energy, but uses the electrical energy provided by the plug-in, ensuring that the capacity of the power battery and the driving range of the electric vehicle will not decrease, reducing the battery degradation and driving range reduction in winter.

[0063] One possible implementation involves determining whether to activate the electric vehicle's plug-in insulation function based on the ambient temperature and the temperature of the individual battery cells, including:

[0064] Based on the relationship between the ambient temperature and the preset ambient temperature range, determine whether the environmental conditions for heat preservation by inserting the heat gun have been met.

[0065] After confirming that the environmental conditions have been met, determine whether to activate the electric vehicle's plug-in insulation function based on the relationship between the temperature of the individual battery cells and the set range.

[0066] Among these, determining whether the environmental conditions for heat preservation by inserting the heat gun have been met, based on the relationship between the ambient temperature and the preset ambient temperature range, includes:

[0067] When the ambient temperature is within the preset range, the environmental conditions for heat preservation by inserting the heat gun are determined.

[0068] Otherwise, the environmental conditions for inserting the gun for heat preservation have not been met.

[0069] Among these, determining whether to activate the electric vehicle's plug-in insulation function based on the relationship between the temperature of a single battery cell and a set range includes:

[0070] The temperature difference between any two individual cells in the power battery pack is calculated to obtain the temperature difference between any two individual cells.

[0071] When all temperature differences are less than or equal to the preset temperature difference threshold, it is further determined whether the temperature of each individual cell in the power battery pack is outside the set range.

[0072] If the temperature of all individual battery cells is outside the set range, the electric vehicle's plug-in insulation function will be activated; otherwise, the electric vehicle's plug-in insulation function will not be activated.

[0073] For example, with Figure 2Taking the example in the example, assuming the preset ambient temperature range is -35℃ to -5℃, the preset temperature difference threshold is 10℃, and the temperature setting range of the individual cells in the power battery pack is greater than 35℃.

[0074] Sensor unit 21 collects an ambient temperature of -10℃. The maximum temperature difference between individual cells in the power battery pack is 2℃, the highest temperature cell is currently at -5℃, and the lowest temperature cell is currently at -7℃. Sensor unit 21 sends the collected temperature data to VCU22. VCU22 judges the temperature data and confirms that the current ambient temperature of -10℃ is within the preset ambient temperature range of -35℃ to -5℃, thus meeting the environmental conditions for plug-in insulation. The maximum temperature difference between individual cells is 2℃, which is also less than the preset temperature difference threshold of 10℃. The highest temperature cell is currently at -5℃, and the lowest temperature cell is currently at -7℃, both of which are outside the set range of more than 35℃. Therefore, VCU22 determines to activate the plug-in insulation function of the electric vehicle.

[0075] After the electric vehicle's battery insertion nozzle insulation function has been activated for a period of time, sensor unit 21 collects the ambient temperature as -15℃, while the maximum temperature difference between individual cells in the power battery pack is 7℃, and the current temperature of the hottest individual power battery is 37℃. Sensor unit 21 sends the new temperature data to VCU22. After receiving the temperature data, VCU22 re-evaluates the temperature data and confirms that the current ambient temperature of -15℃ is within the preset ambient temperature range of -35℃ to -5℃, thus meeting the environmental conditions for battery insertion nozzle insulation. The maximum temperature difference between individual cells is 7℃, which is also less than the preset temperature difference threshold of 10℃. However, the current temperature of the hottest individual cell is 37℃, which falls within the set range greater than 35℃, requiring the battery insertion nozzle insulation function to be stopped. Therefore, VCU22 determines to disable the electric vehicle's battery insertion nozzle insulation function.

[0076] After the electric vehicle's plug-in insulation function has been off for a period of time, sensor unit 21 detects an ambient temperature of -7℃, while the maximum temperature difference between individual cells in the power battery pack is 12℃, and the current temperature of the hottest individual power battery is 30℃. Sensor unit 21 sends the new temperature data to VCU22. After receiving the temperature data, VCU22 re-evaluates the data and confirms that the current ambient temperature of -7℃ is within the preset ambient temperature range of -35℃ to -5℃, thus meeting the environmental conditions for plug-in insulation. The maximum temperature difference between individual cells is 12℃, exceeding the preset temperature difference threshold of 10℃, therefore, the plug-in insulation function cannot be activated. Thus, VCU22 determines that the electric vehicle's plug-in insulation function needs to remain off.

[0077] After the electric vehicle continues to have its plug-in insulation function off for a period of time, sensor unit 21 detects an ambient temperature of 0°C. The maximum temperature difference between individual cells in the power battery pack is 3°C, and the current temperature of the hottest individual power battery is -1°C. Sensor unit 21 sends the new temperature data to VCU22. After judging the temperature data, VCU22 confirms that the current ambient temperature of 0°C is no longer within the preset ambient temperature range and does not meet the environmental conditions for plug-in insulation. Therefore, the plug-in insulation function of the electric vehicle cannot be activated.

[0078] The technical solution in this application embodiment has the following beneficial effects: VCU22 collects temperature data through sensor unit 21, and monitors and judges in real time whether the conditions for opening the plug-in heat preservation are met from three aspects: ambient temperature, temperature difference between individual cells in the power battery pack and temperature of individual cells. This reduces the safety risks in the process of heating the battery using the plug-in heat preservation system and effectively avoids the situation where heating causes damage to individual cells and thus leads to danger.

[0079] One possible implementation involves controlling the temperature of a single battery cell within a set range using coolant after determining that the insertion gun insulation function has been activated, including:

[0080] When the temperature of a single battery cell is less than or equal to the lower limit of the set range, the coolant is heated, and the heated coolant indirectly heats each single battery cell in the power battery pack until the temperature of all single batteries cells rises to the set range.

[0081] When the temperature of a single battery cell is greater than or equal to the upper limit of the set range, the coolant is cooled, and the heat in the power battery pack is indirectly absorbed through the cooled coolant until the temperature of the single battery cell drops to the set range.

[0082] For example, see Figure 3 , Figure 3This is a schematic diagram of an electric vehicle plug holder insulation system provided in an embodiment of the present invention. It includes a heating unit 31, an electric water pump 32, a power battery pack 33, and a cooling unit 34. A coolant circulation passage 35 between the power battery pack 33 and the heating unit 31 is in close contact with the cooling unit 34. This allows for heat exchange between the coolant in the coolant circulation passage 35 and the cooling unit 34 when the cooling unit 34 is activated, thereby reducing the temperature of the coolant in the coolant circulation passage 35. The electric vehicle plug holder insulation system also includes a cooling expansion valve and an expansion tank. The cooling expansion valve controls the flow of coolant into the electric vehicle plug holder insulation system, and the expansion tank stores coolant and balances the pressure in the circuit.

[0083] by Figure 2 Taking the example in the example, assuming that the set range of the temperature of a single cell is -5℃ to 30℃, the sensor unit 21 collects the current temperature of the single cell as -10℃, and the VCU22 determines to start the insertion gun heat preservation function.

[0084] After VCU22 confirms the activation of the plug-in heat preservation function, it sends a plug-in heat preservation request to BMS23. BMS23 then sends a heating request to CDU24 based on this request. Upon receiving the heating request, CDU24 supplies power to the coolant circulation path and heating unit 31, driving heating unit 31 and electric water pump 32. Electric water pump 32 drives the coolant to circulate in the coolant circulation path. When the coolant circulates to heating unit 31, it is heated by heating unit 31. The heated coolant, controlled by the expansion valve and driven by electric water pump 32, enters the power battery pack 33 to indirectly heat each individual cell in the power battery pack 33 until the temperature of the lowest-temperature individual cell in the power battery pack 33 exceeds the lower limit of the set range of -5°C.

[0085] After VCU22 activates the gun insulation function for a period of time, the temperature data sent by sensor 21 shows that the temperature of the hottest single cell in the power battery pack 33 has reached 33°C. At this point, BMS23 stops sending heating requests to CDU24 and instead sends cooling requests. Upon receiving the cooling request, CDU24 supplies power to the coolant circulation path and cooling unit 34, driving the cooling unit 34 and electric water pump 32. The electric water pump 32 drives the coolant to circulate continuously in the coolant circulation path. When the coolant reaches the coolant circulation path 35, it exchanges heat with the cooling unit 34, thus cooling down. Then, the cooled coolant, controlled by the expansion valve and driven by the electric water pump 32, enters the power battery pack 33 and indirectly absorbs heat from the power battery pack 33 until the temperature of the hottest single cell in the power battery pack 33 drops to the upper limit of the set range of 30°C.

[0086] The technical solution in this application embodiment has the following beneficial effects: BMS23 monitors the power battery temperature and adjusts the request sent to CDU24; CDU24 receives the request sent by BMS23 and uses the heating unit and cooling unit to adjust the temperature of the coolant in real time, thereby keeping the temperature of the individual cells in the power battery pack within the set range, effectively ensuring the performance and lifespan of the power battery pack.

[0087] Based on the same inventive concept, this application provides an electric vehicle; please refer to [link / reference]. Figure 4 The electric vehicle includes:

[0088] Sensor unit 41 is used to detect the ambient temperature around the power battery pack and the temperature of each individual cell in the power battery pack.

[0089] Coolant circulation passage 42 is used to contain circulating coolant for heat exchange with individual cells;

[0090] The vehicle controller 43 is used to collect ambient temperature and individual battery temperature from the sensor unit, and determine whether to activate the electric vehicle's plug-in insulation function based on the ambient temperature and individual battery temperature. After determining to activate the plug-in insulation function, it controls the temperature of the coolant to exchange heat with the individual battery, so that the temperature of the individual battery is controlled within the set range.

[0091] One possible implementation, the vehicle controller, includes:

[0092] The vehicle controller 431 is used to control the working status of the sensor unit, collect the ambient temperature and the temperature of the individual battery cells, and determine whether the plug-in heat preservation function needs to be activated. When the plug-in heat preservation function needs to be activated, a plug-in heat preservation request is sent.

[0093] The battery management system 432 is used to receive the plug-in heat preservation request sent by the vehicle controller, and send a preparation signal to the electronic control system according to the plug-in heat preservation request, and send a corresponding temperature control signal to the thermal management system 44 that controls the coolant.

[0094] The electronic control system 433 is used to receive the preparation signal sent by the battery management system and to supply power to the thermal management system 44 according to the preparation signal.

[0095] One possible implementation, the thermal management system 44, includes:

[0096] Heating unit 441 is used to heat the coolant when the temperature control signal is a heating signal;

[0097] Cooling unit 442 is used to cool the coolant when the temperature control signal is a cooling signal.

[0098] In one possible implementation, the vehicle controller 431 is also used to detect the communication status between the sensor unit 41, the battery management system 432 and the electronic control system 433, as well as the plug connection status of the electric vehicle.

[0099] When communication between sensor unit 41, battery management system 432 and electronic control system 433 is abnormal, or when the electric vehicle's plug connection status is not connected, the plug insulation function of the electric vehicle is stopped.

[0100] Based on the same inventive concept, this application provides a control device for heat preservation of electric vehicle plug nozzles. Please refer to [link to relevant documentation]. Figure 5 The control device includes:

[0101] Sensor module 51 is used to detect the ambient temperature around the power battery pack and the temperature of each individual cell in the power battery pack after slow charging is completed.

[0102] The plug-in insulation control module 52 is used to determine whether to activate the plug-in insulation function of the electric vehicle based on the ambient temperature and the temperature of the individual battery cells.

[0103] The heating circulation module 53 is used to control the temperature of the individual cells within a set range using coolant after the activation of the insertion gun heat preservation function is determined.

[0104] Based on the same inventive concept, one embodiment of the present invention provides a control device for heat preservation of electric vehicle plug nozzles. This control device can be an electronic device such as a personal computer, and may include:

[0105] At least one processor is used to implement the steps of the electric vehicle insulator heat preservation control method provided in the embodiments of this application when executing a computer program stored in a memory.

[0106] Optionally, the processor may be a central processing unit, an application-specific integrated circuit (ASIC), or one or more integrated circuits used to control program execution.

[0107] Optionally, the data integrity protection device also includes a memory connected to at least one processor. The memory may include read-only memory (ROM), random access memory (RAM), and disk storage. The memory stores data required for processor operation; that is, it stores instructions executable by at least one processor. At least one processor executes instructions stored in the memory to perform tasks such as... Figure 1The method is shown. The number of memories can be one or more.

[0108] Based on the same inventive concept, this application also provides a computer storage medium, wherein the computer storage medium stores computer instructions, and when the computer instructions are executed on the computer, the computer performs the steps of the above-mentioned electric vehicle plug-in heat preservation control method.

[0109] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0110] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0111] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0112] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0113] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A control method for heat preservation of electric vehicle plug nozzles, applied to an on-board controller in an electric vehicle, wherein the electric vehicle further includes an electric vehicle plug nozzle heat preservation system, characterized in that, The electric vehicle insulator insulation system includes: The coolant circulation path is in close contact with each individual cell. A cooling unit is attached to the coolant circulation path and is used to cool the coolant when the temperature control signal is set to cooling. A cooling expansion valve is connected to the cooling unit and is used to control the entry of coolant into the electric vehicle plug-in insulation system. A heating unit, the input end of which is connected to the output end of the coolant circulation path, is used to heat the coolant when the temperature control signal is a heating signal; An expansion valve, one input terminal of which is connected to the output terminal of the heating unit; An expansion tank, the input end of which is connected to the coolant circulation path, and the output end of which is connected to the other input end of the expansion valve, the expansion valve being used to store the coolant and balance the pressure in the coolant circulation path; An electric water pump, wherein the input end of the electric water pump is connected to the output end of the expansion valve, and the output end of the electric water pump is connected to the input section of the coolant circulation passage, and the electric water pump is used to drive the coolant to circulate in the coolant circulation passage; The control method includes: After the slow charging is completed, the ambient temperature around the power battery pack and the temperature of each individual battery cell in the power battery pack are detected. Based on the relationship between the ambient temperature and the preset ambient temperature range, determine whether the environmental conditions for heat preservation by inserting the gun have been met. After determining that the environmental conditions have been met, the temperature difference between every two individual cells in the power battery pack is calculated to obtain the temperature difference between every two individual cells. When all temperature differences are less than or equal to the preset temperature difference threshold, it is further determined whether the temperature of each individual cell in the power battery pack is outside the set range. If the temperature of all individual battery cells is outside the set range, the plug-in insulation function of the electric vehicle will be activated; otherwise, the plug-in insulation function of the electric vehicle will not be activated. After confirming the activation of the plug-in insulation function, a temperature control signal is generated and sent to the electric vehicle plug-in insulation system. The electric vehicle plug-in insulation system exchanges heat with the individual battery cell based on the temperature control signal to control the temperature of the individual battery cell within the set range.

2. The control method as described in claim 1, characterized in that, Based on the relationship between the ambient temperature and the preset ambient temperature range, determine whether the environmental conditions for heat preservation by inserting the heat gun have been met, including: When the ambient temperature is within the preset ambient temperature range, the environmental conditions for heat preservation by inserting the gun are determined. Otherwise, the environmental conditions for inserting the gun for heat preservation have not been met.

3. The method as described in claim 1, characterized in that, After confirming the activation of the insertion gun insulation function, the temperature of the individual battery cells is controlled within a set range using coolant, including: When the temperature of the individual battery cell is less than or equal to the lower limit of the set range, the coolant is heated, and the heated coolant indirectly heats each individual battery cell in the power battery pack until the temperature of all individual batteries cell rises to the set range. When the temperature of the individual battery cell is greater than or equal to the upper limit of the set range, the coolant is cooled, and the heat in the power battery pack is indirectly absorbed through the cooled coolant until the temperature of the individual battery cell drops to the set range.

4. An electric vehicle, characterized in that, include: The sensor unit is used to detect the ambient temperature around the power battery pack and the temperature of each individual cell in the power battery pack. A coolant circulation path is provided to contain circulating coolant for heat exchange with the individual battery cells. The vehicle controller is used to collect the ambient temperature and the temperature of the individual battery cells from the sensor unit, and determine whether the environmental conditions for plug-in insulation have been met based on the relationship between the ambient temperature and a preset ambient temperature range. After determining that the environmental conditions have been met, the controller performs a temperature difference calculation on the temperature of every two individual batteries in the power battery pack to obtain the temperature difference between every two individual batteries. When all temperature differences are less than or equal to a preset temperature difference threshold, the controller further determines whether the temperature of each individual battery cell in the power battery pack is outside the set range. If the temperature of all individual batteries is outside the set range, the plug-in insulation function of the electric vehicle is activated; otherwise, the plug-in insulation function of the electric vehicle is not activated. After determining that the plug-in insulation function is activated, a temperature control signal is generated and sent to the electric vehicle plug-in insulation system. The electric vehicle plug-in insulation system exchanges heat with the individual battery cells based on the temperature control signal to keep the temperature of the individual battery cells within the set range. The electric vehicle insulator insulation system includes: The coolant circulation path is in close contact with each individual battery cell; A cooling unit is attached to the coolant circulation path, and the cooling unit is used to cool the coolant in the coolant circulation path when the temperature control signal is cooling. A cooling expansion valve is connected to the cooling unit and is used to control the entry of coolant into the electric vehicle plug-in insulation system. A heating unit, the input end of which is connected to the output end of the coolant circulation path, is used to heat the coolant when the temperature control signal is a heating signal; An expansion valve, one input terminal of which is connected to the output terminal of the heating unit; An expansion tank, the input end of which is connected to the coolant circulation path, and the output end of which is connected to the other input end of the expansion valve, the expansion valve being used to store the coolant and balance the pressure in the coolant circulation path; An electric water pump is provided, wherein the input end of the electric water pump is connected to the output end of the expansion valve, and the output end of the electric water pump is connected to the input section of the coolant circulation path. The electric water pump is used to drive the coolant to circulate in the coolant circulation path.

5. The electric vehicle as described in claim 4, characterized in that, The vehicle controller includes: The vehicle controller is used to control the working state of the sensor unit, collect the ambient temperature and the temperature of the individual battery cells, and determine whether the plug-in heat preservation function needs to be activated. When the plug-in heat preservation function needs to be activated, a plug-in heat preservation request is sent. The battery management system is used to receive the plug-in heat preservation request sent by the vehicle controller, and send a preparation signal to the electronic control system and a corresponding temperature control signal to the electric vehicle plug-in heat preservation system according to the plug-in heat preservation request. The electronic control system is used to receive a preparation signal sent by the battery management system and to supply power to the electric vehicle plug-in insulation system according to the preparation signal.

6. The electric vehicle as described in claim 5, characterized in that, The vehicle controller is also used to detect the communication status between the sensor unit, the battery management system and the electronic control system, as well as the plug connection status of the electric vehicle; When communication between the sensor unit, the battery management system, and the electronic control system is abnormal, or when the electric vehicle's plug connection status is not connected, the plug insulation function of the electric vehicle is stopped.

7. A device for controlling the heat preservation of an electric vehicle plug nozzle, characterized in that, The device includes: Memory, used to store program instructions; A processor is configured to invoke program instructions stored in the memory and execute the steps included in the method according to any one of claims 1-3, in accordance with the obtained program instructions.

8. A storage medium, characterized in that, The storage medium stores computer-executable instructions for causing a computer to perform the steps included in the method of any one of claims 1-3.

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