Charging control method, device, system and vehicle

Abstract

The present disclosure relates to a charging control method, device, system and vehicle, which can control a specified switch to be turned off, and control a bidirectional DCDC to perform step-up conversion to supply power to a high-voltage electrical device and enable a target high-voltage electrical device currently turned on, and send a constant-voltage power supply mode request to a charging pile, the constant-voltage power supply mode request including a current conversion voltage of the target high-voltage electrical device and a current running power of the target high-voltage electrical device, so that the charging pile determines a current output current according to the current conversion voltage and the current running power; and in a case where a difference between a current output power of the charging pile and the current running power is less than or equal to a preset difference threshold, control the bidirectional DCDC to stop performing step-up conversion, so that the charging pile supplies power to the high-voltage electrical device alone.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle charging technology, and in particular to a charging control method, device, system and vehicle. Background Technology

[0002] With the rapid development of the electric vehicle industry, vehicle driving performance and charging performance have become focal points, and these two performance characteristics are closely related to the vehicle's high-voltage battery. It is well known that both discharging and charging of high-voltage batteries achieve optimal performance within a specific temperature range. Similarly, when the battery temperature is low enough, charging or discharging will be impossible. Therefore, the industry is increasingly focusing on battery temperature during vehicle driving and charging, and has begun to implement thermal management systems to preheat the battery to improve subsequent driving or charging performance. Summary of the Invention

[0003] To overcome the problems existing in the related technologies, this disclosure provides a charging control method, device, system and vehicle.

[0004] According to a first aspect of the present disclosure, a charging control method is provided, applied to a vehicle, the vehicle including a high-voltage battery, one or more high-voltage electrical devices, a designated switch, a bidirectional DC-to-DC converter, a charging dock, and a low-voltage battery. The high-voltage battery is connected to the bidirectional DC-to-DC converter, the high-voltage electrical devices, and the charging dock via the designated switch. The bidirectional DC-to-DC converter is connected in parallel with the high-voltage electrical devices. The charging dock is used to connect to a charging gun of a charging pile. The bidirectional DC-to-DC converter is also connected to the low-voltage battery. The method includes:

[0005] When it is determined that the charging dock is connected to the charging gun and the high-voltage battery needs to be heated, the designated switch is controlled to be disconnected, and the bidirectional DC-DC converter is controlled to perform a boost conversion to convert the low-voltage electricity output by the low-voltage battery into the target high-voltage electricity to supply power to the high-voltage electrical equipment. The target high-voltage electrical equipment that is currently turned on is enabled, and a constant voltage power supply mode request is sent to the charging pile. The constant voltage power supply mode request includes the current conversion voltage of the target high-voltage electricity and the current operating power of the target high-voltage electrical equipment, so that the charging pile can determine the current output current based on the current conversion voltage and the current operating power.

[0006] The current output power of the charging pile is determined based on the current output current;

[0007] If the difference between the current output power and the current operating power is less than or equal to a preset difference threshold, the bidirectional DC-DC converter is controlled to stop performing boost conversion, so that the charging pile supplies power to the high-voltage electrical equipment alone.

[0008] Optionally, after enabling the currently active target high-voltage electrical equipment, the method further includes:

[0009] Obtain the preset maximum power of the bidirectional DC-DC converter;

[0010] Within a preset time period after enabling the currently active target high-voltage electrical equipment, if the current operating power of the target high-voltage electrical equipment is greater than or equal to the preset maximum power, the current operating power is reduced so that the current operating power is less than the preset maximum power.

[0011] Optionally, after enabling the currently active target high-voltage electrical equipment, the method further includes:

[0012] The ratio of the current operating power of the target high-voltage electrical equipment to the current transformation voltage is determined to obtain the target operating current of the target high-voltage electrical equipment;

[0013] If the target operating current is less than a preset current threshold, the current operating power is increased.

[0014] Optionally, the method further includes:

[0015] The remaining power of the low-voltage battery is obtained, and if the remaining power is less than a preset power threshold, the bidirectional DC-DC converter is controlled to stop boost conversion.

[0016] Optionally, the method further includes:

[0017] If the charging gun is connected to the charging base, and the battery heating is completed, the designated switch is closed, and a constant current power supply mode request is sent to the charging pile. The constant current power supply mode request includes the current operating power of the target high-voltage electrical equipment, the current battery voltage of the high-voltage battery, and the maximum preset battery voltage, so that the charging pile determines the requested current based on the current operating power and the current battery voltage, and charges the vehicle according to the requested current.

[0018] Optionally, the high-voltage electrical equipment includes a battery heating assembly, and determining that battery heating is complete includes:

[0019] After the battery heating component enters the working state, if the current temperature of the high-voltage battery is determined to be greater than or equal to a preset temperature threshold, the battery heating is determined to be complete.

[0020] Optionally, the high-voltage electrical equipment includes a capacitor with a capacity greater than a preset capacity threshold, and the method further includes:

[0021] If it is determined that the charging dock is not connected to the charging gun, and if a high voltage command is received, the bidirectional DC-DC converter is controlled to perform a voltage boosting change to pre-charge the capacitor in the high voltage electrical equipment.

[0022] Once it is determined that pre-charging is complete, the designated switch is closed.

[0023] According to a second aspect of the present disclosure, a charging control system is provided. The system includes a controller, a high-voltage battery, one or more high-voltage electrical devices, a designated switch, a bidirectional DC-DC converter, a charging dock, and a low-voltage battery. The high-voltage battery is connected to the bidirectional DC-DC converter, the high-voltage electrical devices, and the charging dock via the designated switch. The bidirectional DC-DC converter is connected in parallel with the high-voltage electrical devices. The charging dock is used to connect to the charging gun of a charging pile. The bidirectional DC-DC converter is also connected to the low-voltage battery. The controller is used for:

[0024] When it is determined that the charging dock is connected to the charging gun and the high-voltage battery needs to be heated, the designated switch is controlled to be disconnected, and the bidirectional DC-DC converter is controlled to perform a boost conversion to convert the low-voltage electricity output by the low-voltage battery into the target high-voltage electricity to supply power to the high-voltage electrical equipment. The target high-voltage electrical equipment that is currently turned on is enabled, and a constant voltage power supply mode request is sent to the charging pile. The constant voltage power supply mode request includes the current conversion voltage of the target high-voltage electricity and the current operating power of the target high-voltage electrical equipment, so that the charging pile can determine the current output current based on the current conversion voltage and the current operating power.

[0025] The current output power of the charging pile is determined based on the current output current;

[0026] If the difference between the current output power and the current operating power is less than or equal to a preset difference threshold, the bidirectional DC-DC converter is controlled to stop performing boost conversion, so that the charging pile supplies power to the high-voltage electrical equipment alone.

[0027] Optionally, the controller is further configured to:

[0028] Obtain the preset maximum power of the bidirectional DC-DC converter;

[0029] Within a preset time period after enabling the currently active target high-voltage electrical equipment, if the current operating power of the target high-voltage electrical equipment is greater than or equal to the preset maximum power, the current operating power is reduced so that the current operating power is less than the preset maximum power.

[0030] Optionally, the controller is further configured to:

[0031] The ratio of the current operating power of the target high-voltage electrical equipment to the current transformation voltage is determined to obtain the target operating current of the target high-voltage electrical equipment;

[0032] If the target operating current is less than a preset current threshold, the current operating power is increased.

[0033] Optionally, the controller is further configured to:

[0034] The remaining power of the low-voltage battery is obtained, and if the remaining power is less than a preset power threshold, the bidirectional DC-DC converter is controlled to stop boost conversion.

[0035] Optionally, the controller is further configured to:

[0036] If the charging gun is connected to the charging base, and the battery heating is completed, the designated switch is closed, and a constant current power supply mode request is sent to the charging pile. The constant current power supply mode request includes the current operating power of the target high-voltage electrical equipment, the current battery voltage of the high-voltage battery, and the maximum preset battery voltage, so that the charging pile determines the requested current based on the current operating power and the current battery voltage, and charges the vehicle according to the requested current.

[0037] Optionally, the high-voltage electrical equipment includes a battery heating assembly, and the controller is further configured to:

[0038] After the battery heating component enters the working state, if the current temperature of the high-voltage battery is determined to be greater than or equal to a preset temperature threshold, the battery heating is determined to be complete.

[0039] Optionally, the high-voltage electrical equipment includes a capacitor with a capacity greater than a preset capacity threshold, and the controller is further configured to:

[0040] If it is determined that the charging dock is not connected to the charging gun, and if a high voltage command is received, the bidirectional DC-DC converter is controlled to perform a voltage boosting change to pre-charge the capacitor in the high voltage electrical equipment.

[0041] Once it is determined that pre-charging is complete, the designated switch is closed.

[0042] According to a third aspect of the present disclosure, a charging control device is provided, comprising:

[0043] processor;

[0044] Memory used to store processor-executable instructions;

[0045] The processor is configured to perform the method described in the first aspect above.

[0046] According to a fourth aspect of the present disclosure, a vehicle is provided, including the charging control system described in the second aspect above.

[0047] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0048] When it is determined that the charging dock is connected to the charging gun and the high-voltage battery needs to be heated, the system can control the designated switch to disconnect and control the bidirectional DC-DC converter to perform boost conversion to supply power to the high-voltage electrical equipment. It can also enable the currently active target high-voltage electrical equipment and send a constant-voltage power supply mode request to the charging pile. This request includes the current conversion voltage of the target high-voltage power supply and the current operating power of the target high-voltage electrical equipment, allowing the charging pile to determine the current output current based on these parameters. If the difference between the current output power of the charging pile and the current operating power is less than or equal to a preset difference threshold, the system controls the bidirectional DC-DC converter to stop boost conversion, allowing the charging pile to supply power solely to the high-voltage electrical equipment. This ensures that when the vehicle uses the charging pile's energy to heat the battery, no current enters the high-voltage battery, preventing charging of the extremely low-temperature high-voltage battery or a fully charged high-voltage battery. This effectively avoids damage to the high-voltage battery, improves its safety, and ultimately extends its lifespan.

[0049] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0050] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0051] Figure 1 This is a schematic diagram illustrating a charging control system according to an exemplary embodiment of the present disclosure;

[0052] Figure 2 This is a schematic diagram illustrating a charging control system according to another exemplary embodiment of the present disclosure;

[0053] Figure 3 This is a flowchart illustrating a charging control method in an exemplary embodiment of the present disclosure;

[0054] Figure 4 It is based on Figure 3The illustrated embodiment shows a flowchart of a charging control method;

[0055] Figure 5 It is based on Figure 3 The illustrated embodiment shows a flowchart of another charging control method;

[0056] Figure 6 It is based on Figure 3 The illustrated embodiment shows a flowchart of another charging control method;

[0057] Figure 7 This is a schematic diagram illustrating a charging control system, which is yet another exemplary embodiment of this disclosure;

[0058] Figure 8 This is a block diagram illustrating a vehicle according to an exemplary embodiment. Detailed Implementation

[0059] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0060] It should be noted that all actions involving the acquisition of signals, information, or data in this application are carried out in compliance with the relevant data protection laws and policies of the country where the application is located, and with the authorization granted by the owner of the relevant device.

[0061] Before detailing the specific embodiments of this disclosure, the application scenarios of this disclosure are first explained as follows: This disclosure can be applied to the battery heating process, especially the process of using the charging pile to supply power to the high-voltage electrical equipment (such as battery heating components and air conditioning systems) of the vehicle before charging at a charging station. It can effectively utilize the energy at the charging pile end to heat the vehicle battery, and effectively prevent current from entering the battery pack during the heating process. Currently, there are two main schemes for using the energy of the charging pile to heat the vehicle battery: one is to achieve heating and charging by limiting the current output of the charging pile. For example... Figure 1 As shown, Figure 1This is a schematic diagram of a charging control system according to an exemplary embodiment of this disclosure. When the vehicle detects that the charging dock is connected to the charging gun and the battery needs to be heated, it requests a CC (constant current) power supply mode from the charging pile. The voltage request is the maximum battery voltage Umax, and the current request is Iacc, which is the current required based on the current power demand of the high-voltage auxiliary components (which may include PTC (positive temperature coefficient) thermistors, compressors, DC-DC converters, etc.) and the current supplied by the high-voltage battery. This current request needs to change rapidly according to the actual power changes of the high-voltage auxiliary components, so that the charging pile current only supplies power to the high-voltage auxiliary components and does not enter the high-voltage battery. After heating is complete, if battery charging is required, the current request is modified to Ibat + Iacc, where Ibat is the current required for battery charging. Another solution is to disconnect the high-voltage battery relay. (The text continues with...) Figure 1Taking an example, when the vehicle detects that it needs to plug in for charging and that the battery needs to be heated, the relay Q of the high-voltage battery is disconnected, requesting CV mode (constant voltage mode) from the charging station. The voltage request is the current voltage Ucur of the high-voltage battery, and the current request is the current charging current Ibat + Iacc of the vehicle. Because in CV mode, the current request is only an upper limit, and the actual current output depends on the vehicle's load power, and the requested voltage being consistent with the current voltage of the high-voltage battery ensures that the voltage inside and outside the relay Q remains consistent after the battery is heated, allowing for a smooth transition to battery charging mode. After heating, if charging is required, the relay Q is closed, and the charging station's mode request is changed to constant current mode, with the voltage request modified to the maximum charging voltage Umax of the high-voltage battery. The inventors found that the first solution described above cannot adapt to charging stations with slow transient responses. For example, after entering battery heating mode, if the user turned on the air conditioning and the thermal management system was also heating the battery, the vehicle would request 50A of current from the charging station, and the charging station would output 50A. However, if the user then turned off the air conditioning, the vehicle would request only 20A of current. Because the charging station responds slowly, it would still output 50A, and the excess 30A would flow into the battery pack, undoubtedly damaging the battery. Furthermore, the first scenario also carries the risk of current flowing into the battery pack when the vehicle's air conditioning load changes abruptly. For example, if the vehicle's thermal management power demand is high one moment and low the next, due to internal vehicle calculations and data exchange between the vehicle and the charging station, the charging station's normal response to current changes takes approximately one second. During this short period, current could flow into the battery pack, causing irreversible damage even after repeated occurrences. The second scenario is also incompatible with existing charging stations. Currently, some charging stations require a power module switching and startup after entering charging mode, which takes approximately 1 to 10 seconds. Some older stations may not even start or output current within 2 minutes of starting charging. If high-voltage devices in the vehicle are activated before the station starts, the charging port voltage will rapidly drop to 0, causing the charging station to shut down. Some charging stations also detect the output current after starting charging; if the output current remains at 0A for a period of time, it will enter no-load protection and terminate charging. In other words, current methods of using charging station energy to heat vehicle batteries either present the problem of short-term current entering extremely low-temperature or fully charged high-voltage batteries, potentially damaging them, or they may be incompatible with the charging station, leading to charging failure.

[0062] To address the aforementioned technical problems, this disclosure provides a charging control method, device, system, and vehicle. The charging control method, when it is determined that the charging dock is connected to the charging gun and the high-voltage battery requires heating, controls a designated switch to disconnect and controls the bidirectional DC-DC converter to perform boost conversion to supply power to the high-voltage electrical equipment. It also enables the currently active target high-voltage electrical equipment and sends a constant-voltage power supply mode request to the charging pile. This constant-voltage power supply mode request includes the current conversion voltage of the target high-voltage electrical equipment and the current operating power of the target high-voltage electrical equipment, allowing the charging pile to determine the current output current based on the current conversion voltage and current operating power. If the difference between the current output power of the charging pile and the current operating power is less than or equal to a preset difference threshold, the bidirectional DC-DC converter stops boost conversion, allowing the charging pile to supply power solely to the high-voltage electrical equipment. This ensures that when the vehicle uses the energy from the charging pile to heat the battery, no current enters the high-voltage battery, thus preventing charging of the high-voltage battery at extremely low temperatures or a fully charged high-voltage battery. This effectively avoids damage to the high-voltage battery, improves its safety, and ultimately extends its lifespan.

[0063] The specific embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0064] Figure 2 This is a schematic diagram of a charging control system shown in another exemplary embodiment of this disclosure, such as... Figure 2 As shown, the charging control system may include a vehicle end and a charging pile end. The vehicle end may include a high-voltage battery 201, one or more high-voltage electrical devices 202, a designated switch 203, a bidirectional DC-DC converter 204, a charging dock 205, and a low-voltage battery 206. The high-voltage battery 201 is connected to the bidirectional DC-DC converter 204, the high-voltage electrical devices 202, and the charging dock 205 through the designated switch 203. The bidirectional DC-DC converter 204 is connected in parallel with the high-voltage electrical devices 202. The charging dock 205 is used to connect the charging gun of the charging pile. The bidirectional DC-DC converter 204 is also connected to the low-voltage battery 206.

[0065] The high-voltage electrical equipment may include a battery heating assembly, such as a PTC electric heater, a liquid circulation heating assembly, or a blower heating assembly. The low-voltage battery 206 may be a 12V or 48V battery, or other low-voltage batteries. The designated switch 203 may be a positive and / or negative relay connected to the high-voltage battery on the vehicle, a switching transistor, or other self-control switches in the related art. The bidirectional DC-DC converter may be any circuit module in the prior art capable of high-voltage to low-voltage and low-voltage to high-voltage conversion; there are many related circuits and functional modules in the prior art, and this disclosure does not limit its use.

[0066] In addition, this vehicle terminal is used for execution Figure 3 The charging control method shown is as follows: Figure 3 This is a flowchart illustrating an exemplary embodiment of the present disclosure of a charging control method; the charging control method may include:

[0067] Step 301: When it is determined that the charging dock is connected to the charging gun and the high-voltage battery needs to be heated, the designated switch is controlled to be disconnected, and the bidirectional DC-DC converter is controlled to perform boost conversion to convert the low-voltage electricity output by the low-voltage battery into the target high-voltage electricity to supply power to the high-voltage electrical equipment, and the currently activated target high-voltage electrical equipment is enabled, and a constant voltage power supply mode request is sent to the charging pile.

[0068] The constant voltage power supply mode request includes the current conversion voltage of the target high voltage power supply and the current operating power of the target high voltage power equipment, so that the charging pile can determine the current output current based on the current conversion voltage and the current operating power.

[0069] It should be noted that the current conversion voltage can be equal to the current output voltage of the high-voltage battery. When controlling the bidirectional DC-DC converter for boost conversion, the low-voltage electricity output from the low-voltage battery can be converted into high-voltage electricity with the same voltage as the current output voltage of the high-voltage battery. For example, if the low-voltage battery outputs 12V and the current output voltage of the high-voltage battery is 400V, the 12V can be converted to 400V. Furthermore, when determining the current output current based on the current conversion voltage and the current operating power, the charging pile can obtain the ratio of the current operating power to the current conversion voltage to arrive at the current output current.

[0070] In this way, for charging piles that cannot output current for a period of time before charging, the bidirectional DC-DC converter can first use the energy of the low-voltage battery to power the high-voltage electrical equipment in the vehicle, which can effectively prevent the charging voltage from dropping.

[0071] Step 302: Determine the current output power of the charging pile based on the current output current.

[0072] In constant voltage power supply mode, the charging pile provides a constant voltage, which is the current conversion voltage in the constant voltage power supply mode request. Given the charging pile's power supply voltage and output current before archiving, the current output power of the charging pile can be determined according to the power calculation formula P=UI.

[0073] Step 303: If the difference between the current output power and the current operating power is less than or equal to a preset difference threshold, control the bidirectional DC-DC converter to stop performing boost conversion so that the charging pile supplies power to the high-voltage electrical equipment alone.

[0074] It should be noted that, due to the limited capacity of low-voltage batteries, they typically cannot supply power to high-voltage equipment for extended periods. Therefore, this step requires determining whether the charging station is currently outputting current: Both the bidirectional DC-DC converter and the charging station must be in CV mode, and the voltage output by the bidirectional DC-DC converter (i.e., the current conversion voltage) must be the current output voltage of the high-voltage battery. The voltage output by the charging station must also be the current output voltage of the high-voltage battery, and both must be the same. Thus, when the charging station is not outputting current, the power required by the currently active high-voltage equipment in the vehicle, Pacc, can be entirely provided by the bidirectional DC-DC converter, i.e., Pacc = Pdcdc, where Pdcdc is the power provided by the bidirectional DC-DC converter. After the charging station starts outputting current, the power required by the target high-voltage equipment in the vehicle will be shared by both the bidirectional DC-DC converter and the charging station, i.e., Pacc = Pdcdc + Pchager, where Pacc is the current operating power of the currently active high-voltage equipment in the vehicle, Pdcdc is the power provided by the bidirectional DC-DC converter (i.e., the current output power), and Pchager is the power provided by the charging station (i.e., the current output power). Since the power provided by the charging pile is much greater than the power that the bidirectional DC-DC converter can provide through boost conversion, it's possible that the power required by the currently activated high-voltage electrical equipment is entirely provided by the charging pile, meaning the bidirectional DC-DC converter has almost no power output, i.e., Pacc ≈ Pcharger. Therefore, in this step, the difference between Pdcdc and Pacc can be used to determine whether the charging pile is outputting current. If the power Pacc of the target high-voltage electrical equipment is significantly greater than the output power Pdcdc of the bidirectional DC-DC converter, it can be determined that the charging pile has started outputting current. If the difference between Pacc and Pcharger is less than a preset difference threshold, it can be determined that the bidirectional DC-DC converter is not currently outputting current, and the boost conversion of the bidirectional DC-DC converter can be stopped so that the charging pile can supply power to the high-voltage electrical equipment alone.

[0075] In addition, after stopping the bidirectional DC-DC converter from performing boost conversion, the high-voltage to low-voltage function of the bidirectional DC-DC converter can be enabled to charge the low-voltage battery.

[0076] In this way, the low-voltage battery capacity commonly equipped in electric vehicles is fully capable of meeting the power requirements of high-voltage electrical equipment in some charging piles when there is no current output for a short period of time. Therefore, it can effectively improve the applicability of charging piles, reduce the probability of vehicle charging failure, and further improve the user experience of vehicles.

[0077] The above technical solutions not only ensure that no current enters the high-voltage battery when the vehicle uses the charging pile's energy to heat the battery, thus preventing the charging of the extremely low-temperature high-voltage battery or a fully charged high-voltage battery, effectively avoiding damage to the high-voltage battery and improving its safety, thereby extending its lifespan; but also accurately detect whether the charging pile starts outputting current and automatically switch the bidirectional DC-DC converter to the bidirectional DC-DC converter, changing the energy source of the target high-voltage electrical equipment from the bidirectional DC-DC converter to the charging pile. This also prevents the charging pile from immediately stopping charging due to no-load protection after starting charging, effectively improving the applicability of the charging pile, reducing the probability of vehicle charging failure, and further enhancing the user experience.

[0078] Figure 4 It is based on Figure 3 The illustrated embodiment presents a flowchart of a charging control method; as shown in the figure. Figure 4 As shown, after enabling the currently active target high-voltage electrical equipment as described in step 301, the method may further include:

[0079] Step 304: Obtain the preset maximum power of the bidirectional DC-DC converter.

[0080] Step 305: Within a preset time period after enabling the currently activated target high-voltage electrical equipment, if the current operating power of the target high-voltage electrical equipment is greater than or equal to the preset maximum power, reduce the current operating power so that the current operating power is less than the preset maximum power.

[0081] The preset time period can be a period of time starting from the time when the bidirectional DC-DC converter begins its voltage conversion and ending with the time when the charging pile provides the energy required by the target high-voltage electrical equipment. This period can be preset after being determined through experimental research, or it can be set based on empirical values.

[0082] The above technical solutions can ensure that the power required by the target high-voltage electrical equipment is controlled within the preset maximum power range that the bidirectional DC-DC converter can provide, effectively improving the reliability of the power supply to the target high-voltage electrical equipment and helping to ensure the stability of the charging control system.

[0083] Figure 5 It is based on Figure 3The illustrated embodiment shows a flowchart of another charging control method; as shown Figure 5 As shown, after enabling the currently active target high-voltage electrical equipment as described in step 301, the method may further include:

[0084] Step 306: Determine the ratio of the current operating power of the target high-voltage electrical equipment to the current conversion voltage to obtain the target operating current of the target high-voltage electrical equipment.

[0085] Step 307: If the target operating current is less than a preset current threshold, increase the current operating power.

[0086] The preset current threshold can be 3A or other values ​​greater than 3A.

[0087] Through steps 306 to 307 above, when it is determined that the target operating current is less than the preset current threshold, increasing the current operating power can ensure that the target operating current is greater than or equal to the preset current threshold. In this way, it can also be applied to some existing charging piles with a sampling accuracy of only 3A, which helps to improve the applicability to existing charging piles and thus improve the success rate of vehicle charging.

[0088] Optionally, the method may further include:

[0089] The remaining power of the low-voltage battery is obtained, and if the remaining power is less than a preset power threshold, the bidirectional DC-DC converter is controlled to stop boost conversion.

[0090] It should be noted that if the low-voltage battery is 12V, based on the 12V battery capacity commonly equipped in current electric vehicles, it is sufficient to meet the power requirements of high-voltage electrical equipment when some older charging stations fail to start within 2 minutes of charging and have no output current. However, the situation of charging station malfunctions must also be considered, such as when the charging station has no current output. This requires the vehicle to add protection strategies to prevent the 12V battery from running out of power. In other words, the above technical solution, by controlling the bidirectional DC-DC converter to stop boost conversion when the remaining power is less than a preset power threshold, can effectively prevent the low-voltage battery from running out of power, thereby effectively improving the reliability of the charging control system.

[0091] Optionally, the method further includes:

[0092] If the charging gun is connected to the charging base, and the battery heating is completed, the designated switch is closed, and a constant current power supply mode request is sent to the charging pile. The constant current power supply mode request includes the current operating power of the target high-voltage electrical equipment, the current battery voltage of the high-voltage battery, and the maximum preset battery voltage, so that the charging pile determines the requested current based on the current operating power and the current battery voltage, and charges the vehicle according to the requested current.

[0093] The high-voltage electrical equipment includes a battery heating assembly, and the implementation method for determining the completion of battery heating may include:

[0094] After the battery heating component enters the working state, if the current temperature of the high-voltage battery is determined to be greater than or equal to a preset temperature threshold, the battery heating is determined to be complete.

[0095] In this way, after heating is complete, the vehicle can directly enter charging mode, ensuring automatic switching between battery heating mode and charging mode, thereby effectively guaranteeing the reliability of vehicle charging.

[0096] Figure 6 It is based on Figure 3 The illustrated embodiment shows a flowchart of another charging control method; as shown Figure 6 As shown, the high-voltage electrical equipment includes a capacitor with a capacity greater than a preset capacity threshold, and the method further includes:

[0097] Step 308: If it is determined that the charging dock is not connected to the charging gun, and if a high voltage command is received, the bidirectional DC-DC converter is controlled to perform voltage boosting to pre-charge the capacitor in the high voltage electrical equipment.

[0098] The high-voltage command is used to close the relay between the high-voltage battery and the high-voltage electrical equipment.

[0099] Step 309: If it is determined that the pre-charge is complete, control the designated switch to close.

[0100] The above technical solution reuses the vehicle's bidirectional DC-DC converter. Before the vehicle is connected to high voltage, the bidirectional DC-DC converter is activated to perform a voltage boost conversion (converting the low-voltage electricity output from the low-voltage battery to high-voltage electricity) to charge the large capacitor of the high-voltage device. After charging is completed, the designated switch is closed. This not only effectively improves the utilization rate of the bidirectional DC-DC converter and ensures the reliability of high-voltage power supply, but also ensures that no current enters the high-voltage battery when the vehicle uses the energy of the charging pile to heat the battery without increasing costs. This prevents charging of the high-voltage battery at extremely low temperatures or when it is fully charged, effectively avoiding damage to the high-voltage battery, improving its safety, and thus effectively extending its service life.

[0101] Figure 7 This is a schematic diagram of a charging control system shown in yet another exemplary embodiment of this disclosure, such as... Figure 7 As shown, the charging control system may include a vehicle end and a charging pile end. The vehicle end may include a controller 701, a high-voltage battery 702, one or more high-voltage electrical devices 703, a designated switch 704, a bidirectional DC-DC converter 705, a charging dock 706, and a low-voltage battery 707. The high-voltage battery 702 is connected to the bidirectional DC-DC converter 705, the high-voltage electrical devices 703, and the charging dock 706 through the designated switch 704. The bidirectional DC-DC converter 705 is connected in parallel with the high-voltage electrical devices 703. The charging dock 706 is used to connect the charging gun of the charging pile. The bidirectional DC-DC converter 705 is also connected to the low-voltage battery 707.

[0102] The controller can be an OBC (On-board Charger), a battery management controller, a vehicle controller, a body control unit, or other controllers. The high-voltage electrical equipment can include battery heating components, such as a PTC electric heater, a liquid circulation heating component, or a blower heating component. The low-voltage battery 707 can be a 12V battery, a 48V battery, or other low-voltage batteries. The designated switch 704 can be a positive and / or negative relay connected to the high-voltage battery on the vehicle, a switching transistor, or other self-controlling switches in the related art. The bidirectional DC-DC converter can be any circuit module in the prior art capable of high-voltage to low-voltage and low-voltage to high-voltage conversion. There are many related circuits and functional modules in the prior art, and this disclosure does not limit them.

[0103] Additionally, the controller 701 can be connected to the high-voltage battery 702, the high-voltage electrical device 703, the designated switch 704, the bidirectional DC-DC converter 705, the charging dock 706, and the low-voltage battery 707. The controller 701 is used for:

[0104] When it is determined that the charging dock is connected to the charging gun and the high-voltage battery needs to be heated, the designated switch is controlled to be disconnected, and the bidirectional DC-DC converter is controlled to perform a boost conversion to convert the low-voltage electricity output by the low-voltage battery into the target high-voltage electricity to supply power to the high-voltage electrical equipment. The target high-voltage electrical equipment that is currently turned on is enabled, and a constant voltage power supply mode request is sent to the charging pile. The constant voltage power supply mode request includes the current conversion voltage of the target high-voltage electricity and the current operating power of the target high-voltage electrical equipment, so that the charging pile can determine the current output current based on the current conversion voltage and the current operating power.

[0105] The current output power of the charging pile is determined based on the current output current;

[0106] If the difference between the current output power and the current operating power is less than or equal to a preset difference threshold, the bidirectional DC-DC converter is controlled to stop performing boost conversion, so that the charging pile supplies power to the high-voltage electrical equipment alone.

[0107] The above technical solutions not only ensure that no current enters the high-voltage battery when the vehicle uses the charging pile's energy to heat the battery, thus preventing the charging of the extremely low-temperature high-voltage battery or a fully charged high-voltage battery, effectively avoiding damage to the high-voltage battery and improving its safety, thereby extending its lifespan; but also accurately detect whether the charging pile starts outputting current and automatically switch the bidirectional DC-DC converter to the bidirectional DC-DC converter, changing the energy source of the target high-voltage electrical equipment from the bidirectional DC-DC converter to the charging pile. This also prevents the charging pile from immediately stopping charging due to no-load protection after starting charging, effectively improving the applicability of the charging pile, reducing the probability of vehicle charging failure, and further enhancing the user experience.

[0108] Optionally, the controller 701 is further configured to:

[0109] Obtain the preset maximum power of the bidirectional DC-DC converter;

[0110] Within a preset time period after enabling the currently active target high-voltage electrical equipment, if the current operating power of the target high-voltage electrical equipment is greater than or equal to the preset maximum power, the current operating power is reduced so that the current operating power is less than the preset maximum power.

[0111] Optionally, the controller 701 is further configured to:

[0112] The ratio of the current operating power of the target high-voltage electrical equipment to the current transformation voltage is determined to obtain the target operating current of the target high-voltage electrical equipment;

[0113] If the target operating current is less than a preset current threshold, the current operating power is increased.

[0114] Optionally, the controller 701 is further configured to:

[0115] The remaining power of the low-voltage battery is obtained, and if the remaining power is less than a preset power threshold, the bidirectional DC-DC converter is controlled to stop boost conversion.

[0116] Optionally, the controller 701 is further configured to:

[0117] If the charging gun is connected to the charging base, and the battery heating is completed, the designated switch is closed, and a constant current power supply mode request is sent to the charging pile. The constant current power supply mode request includes the current operating power of the target high-voltage electrical equipment, the current battery voltage of the high-voltage battery, and the maximum preset battery voltage, so that the charging pile determines the requested current based on the current operating power and the current battery voltage, and charges the vehicle according to the requested current.

[0118] Optionally, the high-voltage electrical equipment includes a battery heating assembly, and the controller 701 is further configured to:

[0119] After the battery heating component enters the working state, if the current temperature of the high-voltage battery is determined to be greater than or equal to a preset temperature threshold, the battery heating is determined to be complete.

[0120] Optionally, the high-voltage electrical equipment includes a capacitor with a capacity greater than a preset capacity threshold, and the controller is further configured to:

[0121] If it is determined that the charging dock is not connected to the charging gun, and if a high voltage command is received, the bidirectional DC-DC converter is controlled to perform a voltage boosting change to pre-charge the capacitor in the high voltage electrical equipment.

[0122] Once it is determined that pre-charging is complete, the designated switch is closed.

[0123] The above technical solution reuses the vehicle's bidirectional DC-DC converter. Before the vehicle is connected to high voltage, the bidirectional DC-DC converter is activated to perform a voltage boost conversion (converting the low-voltage electricity output from the low-voltage battery to high-voltage electricity) to charge the large capacitor of the high-voltage device. After charging is completed, the designated switch is closed. This not only effectively improves the utilization rate of the bidirectional DC-DC converter and ensures the reliability of high-voltage power supply, but also ensures that no current enters the high-voltage battery when the vehicle uses the energy of the charging pile to heat the battery without increasing costs. This prevents charging of the high-voltage battery at extremely low temperatures or when it is fully charged, effectively avoiding damage to the high-voltage battery, improving its safety, and thus effectively extending its service life.

[0124] Regarding the system in the above embodiments, the specific manner in which the controller performs the operation steps has been described in detail in the embodiments related to the method, and will not be elaborated here.

[0125] This disclosure also provides a charging control device, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute steps of the charging control method provided in this disclosure.

[0126] Figure 8 This is a block diagram illustrating a vehicle according to an exemplary embodiment. For example, vehicle 800 may be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicle. Vehicle 800 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0127] Reference Figure 8 The vehicle 800 may include various subsystems, such as an infotainment system 810, a perception system 820, a decision control system 830, a drive system 840, and a computing platform 850. The vehicle 800 may also include more or fewer subsystems, and each subsystem may include multiple components. Furthermore, each subsystem and each component of the vehicle 800 can be interconnected via wired or wireless means.

[0128] In some embodiments, the infotainment system 810 may include a communication system, an entertainment system, and a navigation system, etc.

[0129] The perception system 820 may include several sensors for sensing information about the environment surrounding the vehicle 800. For example, the perception system 820 may include a global positioning system (which may be GPS, BeiDou, or other positioning systems), an inertial measurement unit (IMU), lidar, millimeter-wave radar, ultrasonic radar, and a camera device.

[0130] The decision control system 830 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0131] The drive system 840 may include components that provide powered motion to the vehicle 800. In one embodiment, the drive system 840 may include an engine, an energy source, a transmission system, and wheels. The engine may be one or a combination of internal combustion engines, electric motors, and compressed air engines. The engine is capable of converting energy provided by the energy source into mechanical energy.

[0132] Some or all of the functions of the vehicle 800 are controlled by a computing platform 850. The computing platform 850 may include at least one processor 851 and a memory 852, the processor 851 being able to execute instructions 853 stored in the memory 852.

[0133] The processor 851 can be any conventional processor, such as a commercially available CPU. The processor may also include, for example, a Graphics Processing Unit (GPU), a Field Programmable Gate Array (FPGA), a System on Chip (SOC), an Application Specific Integrated Circuit (ASIC), or a combination thereof.

[0134] The memory 852 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0135] In addition to instruction set 853, memory 852 can also store data, such as road maps, route information, vehicle position, direction, speed, and other data. The data stored in memory 852 can be used by computing platform 850.

[0136] In this embodiment of the present disclosure, the processor 851 may execute instructions 853 to complete all or part of the steps of the above-described charging control method.

[0137] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of this disclosure. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0138] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A charge control method characterized by, The method is applied to a vehicle, the vehicle including a high-voltage battery, one or more high-voltage electrical devices, a designated switch, a bidirectional DC-DC converter, a charging dock, and a low-voltage battery. The high-voltage battery is connected to the bidirectional DC-DC converter, the high-voltage electrical devices, and the charging dock via the designated switch. The bidirectional DC-DC converter is connected in parallel with the high-voltage electrical devices. The charging dock is used to connect to the charging gun of a charging pile. The bidirectional DC-DC converter is also connected to the low-voltage battery. The method includes: When it is determined that the charging dock is connected to the charging gun and the high-voltage battery needs to be heated, the designated switch is controlled to be disconnected, and the bidirectional DC-DC converter is controlled to perform a boost conversion to convert the low-voltage electricity output by the low-voltage battery into the target high-voltage electricity to supply power to the high-voltage electrical equipment. The target high-voltage electrical equipment that is currently turned on is enabled, and a constant voltage power supply mode request is sent to the charging pile. The constant voltage power supply mode request includes the current conversion voltage of the target high-voltage electricity and the current operating power of the target high-voltage electrical equipment, so that the charging pile can determine the current output current based on the current conversion voltage and the current operating power. The current output power of the charging pile is determined based on the current output current; If the difference between the current output power and the current operating power is less than or equal to a preset difference threshold, the bidirectional DC-DC converter is controlled to stop performing boost conversion, so that the charging pile supplies power to the high-voltage electrical equipment alone.

2. The method of claim 1, wherein, After enabling the currently active target high-voltage electrical equipment, the method further includes: Obtain the preset maximum power of the bidirectional DC-DC converter; Within a preset time period after enabling the currently active target high-voltage electrical equipment, if the current operating power of the target high-voltage electrical equipment is greater than or equal to the preset maximum power, the current operating power is reduced so that the current operating power is less than the preset maximum power.

3. The method of claim 1, wherein, After enabling the currently active target high-voltage electrical equipment, the method further includes: The ratio of the current operating power of the target high-voltage electrical equipment to the current transformation voltage is determined to obtain the target operating current of the target high-voltage electrical equipment; If the target operating current is less than a preset current threshold, the current operating power is increased.

4. The method according to claim 1, characterized in that, The method further includes: The remaining power of the low-voltage battery is obtained, and if the remaining power is less than a preset power threshold, the bidirectional DC-DC converter is controlled to stop boost conversion.

5. The method according to claim 1, characterized in that, The method further includes: If the charging gun is connected to the charging base, and the battery heating is completed, the designated switch is closed, and a constant current power supply mode request is sent to the charging pile. The constant current power supply mode request includes the current operating power of the target high-voltage electrical equipment, the current battery voltage of the high-voltage battery, and the maximum preset battery voltage, so that the charging pile determines the requested current based on the current operating power and the current battery voltage, and charges the vehicle according to the requested current.

6. The method according to claim 5, characterized in that, The high-voltage electrical equipment includes a battery heating assembly, and determining that battery heating is complete includes: After the battery heating component enters the working state, if the current temperature of the high-voltage battery is determined to be greater than or equal to a preset temperature threshold, the battery heating is determined to be complete.

7. The method according to claim 1, characterized in that, The high-voltage electrical equipment includes a capacitor with a capacity greater than a preset capacity threshold, and the method further includes: If it is determined that the charging dock is not connected to the charging gun, and if a high voltage command is received, the bidirectional DC-DC converter is controlled to perform a voltage boosting change to pre-charge the capacitor in the high voltage electrical equipment. Once it is determined that pre-charging is complete, the designated switch is closed.

8. A charging control system, characterized in that, The system includes a controller, a high-voltage battery, one or more high-voltage electrical devices, a designated switch, a bidirectional DC-DC converter, a charging dock, and a low-voltage battery. The high-voltage battery is connected to the bidirectional DC-DC converter, the high-voltage electrical devices, and the charging dock via the designated switch. The bidirectional DC-DC converter is connected in parallel with the high-voltage electrical devices. The charging dock is used to connect to the charging gun of a charging pile. The bidirectional DC-DC converter is also connected to the low-voltage battery. The controller is used for: When it is determined that the charging dock is connected to the charging gun and the high-voltage battery needs to be heated, the designated switch is controlled to be disconnected, and the bidirectional DC-DC converter is controlled to perform a boost conversion to convert the low-voltage electricity output by the low-voltage battery into the target high-voltage electricity to supply power to the high-voltage electrical equipment. The target high-voltage electrical equipment that is currently turned on is enabled, and a constant voltage power supply mode request is sent to the charging pile. The constant voltage power supply mode request includes the current conversion voltage of the target high-voltage electricity and the current operating power of the target high-voltage electrical equipment, so that the charging pile can determine the current output current based on the current conversion voltage and the current operating power. The current output power of the charging pile is determined based on the current output current; If the difference between the current output power and the current operating power is less than or equal to a preset difference threshold, the bidirectional DC-DC converter is controlled to stop performing boost conversion, so that the charging pile supplies power to the high-voltage electrical equipment alone.

9. A charging control device, characterized in that, include: processor; Memory used to store processor-executable instructions; The processor is configured to perform the method according to any one of claims 1 to 7.

10. A vehicle, characterized in that, Includes the charging control system described in claim 8.

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