A staged control method and battery management controller for vehicle boost charging

Abstract

This invention belongs to the field of new energy vehicle charging technology, specifically relating to a stage control method and battery management controller for vehicle boost charging. The method includes: controlling the operation of a motor boost module to charge the battery pack according to a boost preparation stage, a boost start stage, and a boost execution stage. Specifically, in the boost preparation stage: the motor boost module is controlled to switch to pre-charge mode, and the pre-charge capacitor on the charging circuit is charged through the battery pack to achieve a target voltage. When the difference between the voltage on the pre-charge capacitor and the target voltage is less than a preset voltage threshold, a request is made to the charging pile to start charging. When the output voltage and output current of the charging pile meet the preset threshold, the motor boost module is controlled to switch to boost mode to enter the boost start stage. This invention achieves stable and efficient control of different stages of boost charging and is compatible with charging piles with varying output performance and capabilities available on the market.

Description

Technical Field

[0001] This invention belongs to the field of new energy vehicle charging technology, specifically relating to a stage control method for vehicle boost charging and a battery management controller. Background Technology

[0002] With the rapid development of new energy vehicles, addressing users' concerns about charging capacity and range anxiety has become a major challenge for automakers. Currently, many automakers have launched 800V high-voltage platforms, which can increase charging power and significantly reduce charging time, becoming a key architecture for new energy technology development. However, many 500V charging stations still exist on the market and are incompatible with the batteries of vehicles using 800V high-voltage platforms. To fully utilize existing charging infrastructure resources, the mainstream 800V charging solution reuses the motor drive for boost charging.

[0003] Due to the wide variety of charging piles on the market, their actual output voltage and current performance, voltage regulation capabilities, and strategies for stopping charging vary. Different stages of boost charging are easily affected by the output delay and output capacity fluctuations of the charging pile. The power balance between the input and output sides of the motor-driven boost charging can be easily disrupted, which may lead to problems such as charging voltage fluctuations, limited charging current, or even abnormal charging stoppage, thereby affecting the reliability and compatibility of boost charging.

[0004] Traditional boost charging methods cannot achieve effective and stable control for dynamic and unpredictable boost charging conditions. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a boost charging method for vehicle batteries that can effectively avoid voltage fluctuations during the charging process and ensure the stable operation of vehicle boost charging.

[0006] To achieve the above and other related objectives, the present invention provides a staged control method for vehicle boost charging, comprising: controlling the operation of a boost motor boost module to charge the battery pack according to a boost preparation stage, a boost start stage, and a boost execution stage; wherein, in the boost preparation stage: the boost motor boost module is controlled to switch to a pre-charge mode, and the pre-charge capacitor on the charging circuit is charged through the battery pack so that its voltage reaches a target voltage; and when the difference between the voltage on the pre-charge capacitor and the target voltage is less than a preset voltage threshold, a request is made to the charging pile to start charging, and when the output voltage and output current of the charging pile meet the preset threshold, the boost motor boost module is controlled to switch to boost mode to enter the boost start stage.

[0007] According to a specific embodiment of the present invention, during the boost start-up phase: the current output by the motor boost module is controlled to rise to a preset target value at a preset rate, and the voltage fluctuation on the pre-charge capacitor is monitored so as to control the motor boost module to derating when the fluctuation is large; wherein, when the current output by the motor boost module reaches the target value, or when the current output by the motor boost module drops to the point where the voltage of the pre-charge capacitor is stable, the boost process phase is entered.

[0008] According to a specific embodiment of the present invention, the current output by the motor boost module is controlled to rise to the target value at a preset rate, and the voltage fluctuation on the pre-charge capacitor is monitored after a preset time, so as to control the motor boost module to dredge the output when the voltage fluctuation is large.

[0009] According to a specific embodiment of the present invention, the step of monitoring voltage fluctuations on the pre-charge capacitor and controlling the derating output of the motor boost module when the fluctuations are large includes: when the voltage on the pre-charge capacitor deviates from the target voltage, calculating the area integral enclosed by the voltage on the pre-charge capacitor relative to the target voltage; if the area integral is greater than or equal to a preset voltage instability threshold, it is considered that the charging pile has reached the current output capacity limit, and the current output by the motor boost module is controlled to decrease at a preset rate until the area integral is less than the voltage instability threshold; if the area integral is less than the preset voltage instability threshold, it is considered that the output capacity of the charging pile meets the charging demand, and there is no need to control the derating output of the motor boost module.

[0010] According to a specific embodiment of the present invention, the step of monitoring the voltage fluctuation on the pre-charge capacitor and controlling the motor boost module to derating the output when the fluctuation is large further includes: when the voltage on the pre-charge capacitor is maintained at the target voltage, stopping the calculation of the area integral and clearing it to zero.

[0011] According to a specific embodiment of the present invention, during the boost stage: the voltage fluctuation on the pre-charge capacitor is monitored, and the upper limit of the output capacity of the charging pile is determined based on the current output by the motor boost module and the preset target value, so as to adjust the current output by the motor boost module in real time.

[0012] According to a specific embodiment of the present invention, the step of monitoring voltage fluctuations on the pre-charge capacitor and determining the upper limit of the charging pile's output capacity based on the current output by the motor boost module and the target value, so as to adjust the current output by the motor boost module in real time, includes: calculating the area integral formed by the voltage on the pre-charge capacitor relative to the target voltage to monitor voltage fluctuations on the pre-charge capacitor and adjusting the current output by the motor boost module accordingly; calculating the difference between the target value and the current output by the unadjusted / adjusted motor boost module, and determining whether it is permissible to test the upper limit of the charging pile's output capacity based on the time taken when the difference is greater than or equal to a preset current difference threshold and the area integral is less than a preset voltage instability threshold, and adjusting the current output by the motor boost module accordingly to fully utilize the charging pile's output capacity to charge the battery pack.

[0013] According to a specific embodiment of the present invention, the step of determining whether to allow testing the upper limit of the charging pile's output capacity based on a timing period when the difference is greater than or equal to a preset current difference threshold and the area integral is less than a preset voltage instability threshold, and correspondingly adjusting the current output of the motor boost module, includes: starting timing when the difference is greater than or equal to the preset current difference threshold and the area integral is less than the preset voltage instability threshold; if the timing exceeds a preset time threshold, controlling the current output of the motor boost module to rise to the target value at a preset rate to test the upper limit of the charging pile's output capacity, and maintaining the current output of the motor boost module at the maximum value of the pre-charge capacitor voltage stability; wherein, during the timing period, if the difference is less than the current difference threshold or the area integral is greater than or equal to the voltage instability threshold, timing is stopped and reset to zero.

[0014] According to a specific embodiment of the present invention, the step of probing the upper limit of the output capacity of the charging pile and maintaining the current output by the motor boost module at the maximum value of the voltage stability of the pre-charge capacitor includes: during the rise of the current output by the motor boost module, monitoring the voltage fluctuation on the pre-charge capacitor; if the area integral is greater than or equal to the voltage instability threshold, it is considered that the charging pile has reached the current upper limit of the output capacity, and the current output by the motor boost module is controlled to decrease at a preset rate until the area integral is less than the voltage instability threshold, and the timing is reset to zero; if the area integral is less than the voltage instability threshold, the current output by the motor boost module continues to rise until the target value is reached.

[0015] A staged control method for vehicle boost charging includes: controlling a motor boost module to operate according to a boost preparation stage, a boost start stage, and a boost execution stage to charge a battery pack; wherein, during the boost start stage: controlling the current output by the motor boost module to rise to a preset target value at a preset rate, and monitoring the voltage fluctuation of the pre-charge capacitor in the charging circuit, so as to control the motor boost module to derating its output when the fluctuation is large; and when the current output by the motor boost module reaches the target value, or when the current output by the motor boost module drops to the point where the voltage of the pre-charge capacitor is stable, the system enters the boost execution stage.

[0016] A staged control method for vehicle boost charging includes: controlling the operation of a motor boost module to charge the battery pack according to a boost preparation stage, a boost start stage, and a boost execution stage; wherein, during the boost execution stage: monitoring the voltage fluctuation of the pre-charge capacitor on the charging circuit, and determining the upper limit of the charging pile's output capacity based on the current output by the motor boost module and a preset target value, so as to adjust the current output by the motor boost module in real time.

[0017] A battery management controller for executing the staged control method for vehicle boost charging as described in any of the preceding claims.

[0018] This invention provides a stage control method for vehicle boost charging, which can achieve stable and reliable voltage control during the boost preparation stage based on appropriate motor mode switching timing and the judgment of charging pile output parameters, and can be adapted to different types of charging piles.

[0019] Meanwhile, during the boost start-up phase, the stability of the boost charging voltage is monitored in real time through area integration, taking into account the amplitude and duration of voltage fluctuations. This allows it to be compatible with the voltage performance of different types of charging piles on the market when their capacity is insufficient. The output current of the motor boost module is dynamically adjusted to adapt to the fluctuations in the output capacity of the charging pile, thereby improving the robustness and compatibility of boost charging.

[0020] In addition, periodically testing the upper limit of the charging pile's output capacity during the boost phase allows for real-time adjustment of the boost charging current as the grid load changes, thus ensuring that boost charging remains in the most efficient charging state, shortening the boost charging time, and improving the user experience. Attached Figure Description

[0021] Figure 1 A flowchart illustrating a specific embodiment of a stage control method for vehicle boost charging provided by the present invention;

[0022] Figure 2 This is a flowchart illustrating a specific embodiment of the boost preparation stage provided by the present invention.

[0023] Figure 3 A schematic diagram of the circuit topology of a specific embodiment of a vehicle charging circuit;

[0024] Figure 4 A schematic flowchart illustrating another specific embodiment of the boost preparation stage provided by the present invention;

[0025] Figure 5 This is a flowchart illustrating a specific embodiment of the boost start-up stage provided by the present invention.

[0026] Figure 6 This is a flowchart illustrating a specific embodiment of the boost stage provided by the present invention.

[0027] Figure 7 A flowchart illustrating another specific embodiment of the boost start-up stage provided by the present invention;

[0028] Figure 8 This is a schematic flowchart of another specific embodiment of the boost stage provided by the present invention. Detailed Implementation

[0029] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0031] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0032] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0033] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0034] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0035] Example 1

[0036] Please see Figure 1 As shown in Figure 2, a staged control method for vehicle boost charging includes: controlling the boost motor boost module to operate according to the boost preparation stage, boost start stage, and boost execution stage to charge the battery pack. In the boost preparation stage S100:

[0037] In step S110, the motor boost module is switched to pre-charge mode, and the pre-charge capacitor on the charging circuit is charged through the battery pack so that its voltage reaches the target voltage.

[0038] Step S120: When the difference between the voltage on the pre-charge capacitor and the target voltage is less than a preset voltage threshold, the charging pile is requested to start charging.

[0039] Step S130: When the output voltage and output current of the charging pile meet the preset threshold, control the motor boost module to switch to boost mode to enter the boost start-up stage.

[0040] See here. Figure 3 The vehicle charging circuit shown utilizes a motor boost module for boost charging, and the boost charging control can be divided into a boost preparation phase, a boost initiation phase, and a boost execution phase. It should be noted that, for the boost preparation phase, the traditional charging control method involves the BMS (Battery Management System) first closing the boost contactors (both the positive and negative boost contactors), then requesting the motor boost module to pre-charge the pre-charge capacitor through the vehicle's battery pack until the voltage on the pre-charge capacitor reaches the target voltage. Finally, it requests the charging station to begin charging and requests the motor boost module to switch from pre-charge mode to boost mode.

[0041] However, during the transition from pre-charge mode to boost mode, the voltage on the pre-charge capacitor may drop due to electrical load consumption in the charging circuit. This can cause the charging station to detect an abnormal voltage at the vehicle's charging interface and actively stop charging. Furthermore, some charging stations with long output current delays may also experience voltage fluctuations if the motor boost module switches from pre-charge mode to boost mode too early. This disconnects the battery pack's pre-charge circuit to the pre-charge capacitor before the charging station has even started supplying power, resulting in no power supply to either side of the pre-charge capacitor. Consequently, the voltage on the pre-charge capacitor cannot be maintained and will fluctuate, still causing the vehicle to stop charging.

[0042] Therefore, in this embodiment, to avoid the above situation, the vehicle enters the voltage boosting preparation stage immediately after connecting to the charging station. For details, please refer to... Figure 4 As shown, the BMS first closes the boost contactor to close the pre-charge circuit of the pre-charge capacitor and requests the motor boost module to switch to pre-charge mode, thereby charging the pre-charge capacitor through the battery pack. Secondly, when the voltage on the pre-charge capacitor approaches the target voltage (i.e., the difference between the voltage on the pre-charge capacitor and the target voltage is less than a preset voltage threshold), the motor boost module maintains the pre-charge mode and requests the charging pile to start charging in advance, waiting for the charging pile to output current and voltage. Only when the output voltage of the charging pile reaches a certain range of the pre-charge capacitor voltage and the output current exceeds a preset small current threshold is the motor boost module requested to switch to boost mode. Therefore, this method ensures that at least one side of the pre-charge capacitor can output current to maintain voltage stability, while monitoring the output current and voltage of the charging pile and selecting an appropriate time to request the motor boost module to switch from pre-charge mode to boost mode. This method is compatible with charging piles on the market with varying output current delay times.

[0043] It can be understood that after the motor boost module switches from pre-charge mode to boost mode, it enters the boost start-up stage.

[0044] Furthermore, to ensure stable operation during the boost start-up phase, the current output of the motor boost module is controlled to rise at a preset rate to the target value under the corresponding operating condition. Voltage fluctuations on the pre-charge capacitor are monitored during this process, and if the fluctuations are significant, the motor boost module's output is derating. For details, please refer to [link to relevant documentation]. Figure 5 As shown.

[0045] It is understandable that the charging process of the vehicle battery pack can be divided into multiple charging stages, which can be obtained through the corresponding charging map. No excessive restrictions are imposed on this, and each charging stage has a preset target charging current, i.e., a target value. Therefore, the output current of the motor boost module needs to be controlled to meet the target value of the current charging stage as much as possible. Furthermore, the stability of the pre-charge capacitor voltage is not assessed within a preset time after entering the boost start-up stage. This is because the charging pile output current is unstable in the early stages of the boost start-up stage, which can easily cause voltage fluctuations on the pre-charge capacitor. Therefore, not monitoring voltage fluctuations on the pre-charge capacitor and analyzing the stability of boost charging within the preset time can effectively avoid short-term voltage fluctuations caused by misidentification of the charging pile.

[0046] After a preset time, to prevent insufficient charging pile output from causing unstable vehicle boost charging (i.e., voltage fluctuations), the voltage fluctuation of the pre-charging capacitor is monitored. When the voltage on the pre-charging capacitor deviates from the target voltage (i.e., the voltage is higher or lower than the target voltage), the area integral of the pre-charging capacitor's voltage relative to the target voltage is calculated. This process continues until the voltage on the pre-charging capacitor returns to the target voltage, at which point the area integral calculation stops and is reset to zero. During the area integral calculation, if the area integral is greater than or equal to a preset voltage instability threshold, it is considered that the charging pile has reached its current output capacity limit, and the output power of the motor boost module has exceeded the maximum output power of the charging pile, resulting in voltage fluctuations on the pre-charging capacitor. In this case, the current output of the motor boost module needs to be controlled to decrease at a preset rate until the area integral is less than the voltage instability threshold, at which point the voltage on the pre-charging capacitor is considered to have stabilized. If the area integral is less than the preset voltage instability threshold, the voltage on the pre-charge capacitor is considered to be stable, meaning the charging pile's output capacity meets the charging requirements. There is no need to control the motor boost module to derating its output, and since the motor boost module's output current has not yet reached the target value, it can continue to rise at the preset rate. Once the motor boost module's output current reaches the target value, it will maintain the current output current. Furthermore, it can be understood that when the voltage on the pre-charge capacitor returns to the target voltage, or remains at the target voltage, it indicates that the charging pile's output capacity is stable and meets the current charging requirements. Therefore, it is not necessary to perform the above steps to maintain voltage stability. The area integral calculation can be stopped and cleared to zero so that the area integral can be recalculated to determine the charging pile's output capacity the next time the voltage on the pre-charge capacitor deviates from the target voltage. It should also be noted that the area integral is used in absolute value form for this determination.

[0047] Therefore, it can be seen that by monitoring the stability of the boost charging voltage in real time through area integration during the boost start-up phase, taking into account the amplitude and duration of voltage fluctuations, it can be compatible with the voltage performance when different types of charging piles on the market have insufficient capacity. It can also dynamically adjust the output current of the motor boost module to adapt to the fluctuations in the output capacity of the charging pile, thereby improving the robustness and compatibility of boost charging.

[0048] Finally, the boost charging phase begins when the current output by the motor boost module reaches the target value for the corresponding charging stage, or when voltage fluctuations occur during the boost start-up phase, causing the current output by the motor boost module to drop until the voltage of the pre-charge capacitor stabilizes. During the boost charging phase, due to fluctuations in grid load, the charging station's output capacity may initially be insufficient, but recovers after a period of time. If, during this period, the BMS continues to control the motor boost module's operation based on the output current during periods of insufficient charging station capacity, the actual charging current will be lower than expected, the boost charging time will be prolonged, and the vehicle's charging efficiency will be affected.

[0049] For details regarding the boost phase, please refer to [the relevant documentation / reference]. Figure 6 As shown. First, the voltage fluctuation on the pre-charge capacitor is continuously monitored using the area integral method to adjust the output current of the motor boost module in real time. This involves calculating the area integral of the voltage on the pre-charge capacitor relative to the target value and adjusting the output current of the motor boost module accordingly. Based on this, the difference between the target value and the unadjusted / adjusted output current of the motor boost module at the corresponding charging stage is calculated. When this difference is greater than or equal to a preset current difference threshold, and the voltage on the pre-charge capacitor is stable (i.e., the area integral is less than a preset voltage instability threshold), the charging pile capacity limit test timer starts counting. During the counting process, if the difference is less than the current difference threshold or the area integral is greater than or equal to the voltage instability threshold, the timer is reset to zero and counting stops. Counting only restarts when both conditions are met again. This allows for determining whether it is permissible to test the charging pile's output capacity limit based on the counting time.

[0050] Specifically, if the timing exceeds a preset time threshold, the current output by the motor boost module is allowed to rise at a preset rate to the target value for the current charging stage, thus testing the upper limit of the charging output capacity. Furthermore, during the rise of the current output by the motor boost module, voltage fluctuations on the pre-charging capacitor are also monitored to prevent the output power of the motor boost module from exceeding the upper limit of the charging pile's output capacity, thereby affecting the stability of boost charging. This ensures stable boost charging while maximizing the use of the charging pile's maximum output capacity to accelerate the vehicle's charging process and improve charging efficiency. For this, the area integral method is still used to monitor voltage fluctuations on the pre-charging capacitor. That is, the area integral formed by the voltage on the pre-charging capacitor relative to the target voltage is calculated in real time. If the area integral is greater than or equal to the voltage instability threshold, the output power of the motor boost module is considered to have exceeded the upper limit of the charging pile's output capacity, and the current output by the motor boost module is controlled to decrease at a preset rate until the area integral is less than the voltage instability threshold. This can be understood as the current output by the motor boost module decreasing to the level where the pre-charging capacitor voltage stabilizes fully reflecting the upper limit of the charging pile's output capacity at the current moment, and the BMS maintains the motor boost module outputting this current level for charging. Furthermore, if the area integral remains below the voltage instability threshold during the current rise of the motor boost module, it indicates a significant increase in the charging pile's output capacity compared to before. The current rise of the motor boost module can then be continued until the target value is reached. Even after reaching the target value, if the area integral remains below the voltage instability threshold, it means that the vehicle's boost charging can be maintained according to the target value for the current charging stage, thus greatly accelerating the charging rate. It can also be understood that the above steps are repeated during the boost charging phase until the boost charging is complete.

[0051] Therefore, periodically testing the upper limit of the charging pile's output capacity during the boost phase allows for real-time adjustment of the boost charging current as the grid load changes, thus ensuring that boost charging remains in the most efficient charging state, shortening the boost charging time, and improving the user experience.

[0052] It should be noted that the steps of the various methods described above are only for clarity. In practice, they can be combined into one step or some steps can be split into multiple steps. As long as they contain the same logical relationship, they are all within the scope of protection of this patent. Adding insignificant modifications or introducing insignificant designs to the algorithm or process, but without changing the core design of the algorithm and process, are also within the scope of protection of this patent.

[0053] Example 2

[0054] Please see Figure 1As shown in Figures 5 and 7, this application embodiment also provides a staged control method for vehicle boost charging, including: a boost preparation stage, a boost start stage, and a boost execution stage, controlling the boost motor boost module to operate to charge the battery pack. During the boost start stage S200:

[0055] Step S210: Control the current output of the motor boost module to rise to the target value at a preset rate, and monitor the voltage fluctuation on the pre-charge capacitor so as to control the motor boost module to dredge the output when the voltage fluctuation is large.

[0056] Step S220: When the current output by the motor boost module reaches the target value, or when the current output by the motor boost module drops to the point where the voltage of the pre-charge capacitor is stable, the boosting process begins.

[0057] It should be noted that the steps of the various methods described above are only for clarity. In practice, they can be combined into one step or some steps can be split into multiple steps. As long as they contain the same logical relationship, they are all within the scope of protection of this patent. Adding insignificant modifications or introducing insignificant designs to the algorithm or process, but without changing the core design of the algorithm and process, are also within the scope of protection of this patent.

[0058] Example 3

[0059] Please see Figure 1 As shown in Figures 6 and 8, this application embodiment also provides a staged control method for vehicle boost charging, including: controlling the motor boost module to operate according to a boost preparation stage, a boost start stage, and a boost execution stage to charge the battery pack. During the boost execution stage S300:

[0060] Step S310: Monitor the voltage fluctuation on the pre-charge capacitor, and determine the upper limit of the charging pile's output capacity based on the current output by the motor boost module and the target value.

[0061] Step S320: Adjust the current output of the motor boost module in real time.

[0062] It should be noted that the steps of the various methods described above are only for clarity. In practice, they can be combined into one step or some steps can be split into multiple steps. As long as they contain the same logical relationship, they are all within the scope of protection of this patent. Adding insignificant modifications or introducing insignificant designs to the algorithm or process, but without changing the core design of the algorithm and process, are also within the scope of protection of this patent.

[0063] Example 4

[0064] This application also provides a battery management controller for executing the vehicle boost charging stage control method described in Embodiments 1, 2, or 3 above.

[0065] In summary, this invention provides a stage control method for vehicle boost charging, which can achieve stable and reliable voltage control during the boost preparation stage based on appropriate motor mode switching timing and the judgment of charging pile output parameters, and can be adapted to different types of charging piles.

[0066] Meanwhile, during the boost start-up phase, the stability of the boost charging voltage is monitored in real time through area integration, taking into account the amplitude and duration of voltage fluctuations. This allows it to be compatible with the voltage performance of different types of charging piles on the market when their capacity is insufficient. The output current of the motor boost module is dynamically adjusted to adapt to the fluctuations in the output capacity of the charging pile, thereby improving the robustness and compatibility of boost charging.

[0067] In addition, periodically testing the upper limit of the charging pile's output capacity during the boost phase allows for real-time adjustment of the boost charging current as the grid load changes, thus ensuring that boost charging remains in the most efficient charging state, shortening the boost charging time, and improving the user experience.

[0068] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

[0069] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A staged control method for vehicle boost charging, characterized in that, include: The voltage boosting process is divided into three stages: preparation stage, start-up stage, and execution stage. The control motor and voltage boosting module are activated to charge the battery pack. During the boost preparation stage: the control motor boost module is switched to pre-charge mode, and the pre-charge capacitor on the charging circuit is charged through the battery pack so that its voltage reaches the target voltage. Furthermore, when the difference between the voltage on the pre-charge capacitor and the target voltage is less than a preset voltage threshold, the charging pile is requested to start charging, and when the output voltage and output current of the charging pile meet the preset threshold, the motor boost module is controlled to switch to boost mode to enter the boost start-up stage. During the voltage boosting phase: The voltage fluctuation on the pre-charge capacitor is monitored, and the upper limit of the charging pile's output capacity is determined based on the current output by the motor boost module and a preset target value, so as to adjust the current output by the motor boost module in real time. The steps include: Calculate the area integral of the voltage on the pre-charge capacitor relative to the target voltage to monitor voltage fluctuations on the pre-charge capacitor and adjust the current output of the motor boost module accordingly. Calculate the difference between the target value and the current output by the unadjusted / adjusted motor boost module, and determine whether it is permissible to test the upper limit of the charging pile's output capacity based on the time taken when the difference is greater than or equal to a preset current difference threshold and the area integral is less than a preset voltage instability threshold. Adjust the current output by the motor boost module accordingly to fully utilize the charging pile's output capacity to charge the battery pack.

2. The stage control method for vehicle boost charging according to claim 1, characterized in that, During the boost start-up phase: The current output of the motor boost module is controlled to rise to a preset target value at a preset rate, and the voltage fluctuation on the pre-charge capacitor is monitored so that the motor boost module is controlled to dredge the output when the voltage fluctuation is large. Specifically, when the current output by the motor boost module reaches the target value, or when the current output by the motor boost module drops to the point where the voltage of the pre-charge capacitor is stable, the boosting process begins.

3. The stage control method for vehicle boost charging according to claim 2, characterized in that, The current output of the motor boost module is controlled to rise to the target value at a preset rate, and the voltage fluctuation on the pre-charge capacitor is monitored after a preset time, so that the motor boost module is controlled to dredge the output when the voltage fluctuation is large.

4. The stage control method for vehicle boost charging according to claim 2 or 3, characterized in that, The steps of monitoring voltage fluctuations on the pre-charge capacitor and controlling the derating output of the motor boost module when the fluctuations are large include: When the voltage on the pre-charge capacitor deviates from the target voltage, calculate the area integral enclosed by the voltage on the pre-charge capacitor relative to the target voltage: If the area integral is greater than or equal to the preset voltage instability threshold, it is considered that the charging pile has reached the current output capacity limit, and the current output by the motor boost module is controlled to decrease at a preset rate until the area integral is less than the voltage instability threshold. If the area integral is less than the preset voltage instability threshold, it is considered that the charging pile output capacity meets the charging requirements, and there is no need to control the motor boost module to reduce the output.

5. The stage control method for vehicle boost charging according to claim 4, characterized in that, The step of monitoring voltage fluctuations on the pre-charge capacitor and controlling the derating output of the motor boost module when the fluctuations are large further includes: When the voltage on the precharge capacitor is maintained at the target voltage, the calculation of the area integral is stopped and the integral is cleared to zero.

6. The stage control method for vehicle boost charging according to claim 1, characterized in that, The steps for determining whether to allow testing the upper limit of the charging pile's output capacity based on a timing period where the difference is greater than or equal to a preset current difference threshold and the area integral is less than a preset voltage instability threshold, and correspondingly adjusting the current output of the motor boost module, include: When the difference is greater than or equal to a preset current difference threshold, and the area integral is less than a preset voltage instability threshold, timing begins: If the timing time exceeds the preset time threshold, the current output by the motor boost module is controlled to rise to the target value at a preset rate in order to test the upper limit of the charging pile's output capacity and keep the current output by the motor boost module at the maximum value of the pre-charge capacitor voltage. During the timing process, if the difference is less than the current difference threshold or the area integral is greater than or equal to the voltage instability threshold, the timing is stopped and the value is reset to zero.

7. The stage control method for vehicle boost charging according to claim 6, characterized in that, The steps for probing the upper limit of the charging pile's output capacity and maintaining the current output by the motor boost module at the maximum stable voltage of the pre-charge capacitor include: During the rise of the current output by the motor boost module, monitor the voltage fluctuations on the pre-charge capacitor: If the area integral is greater than or equal to the voltage instability threshold, it is considered that the charging pile has reached the current output capacity limit, and the current output by the motor boost module is controlled to decrease at a preset rate until the area integral is less than the voltage instability threshold. If the area integral is less than the voltage instability threshold, the current output by the motor boost module will continue to increase until the target value is reached.

8. A staged control method for vehicle boost charging, characterized in that, include: The voltage boosting process is divided into three stages: preparation stage, start-up stage, and execution stage. The control motor and voltage boosting module are activated to charge the battery pack. During the boost start-up phase, the current output by the motor boost module is controlled to rise to a preset target value at a preset rate, and the voltage fluctuation of the pre-charge capacitor in the charging circuit is monitored so that the motor boost module is controlled to dragged output when the voltage fluctuation is large. Furthermore, when the current output by the motor boost module reaches the target value, or when the current output by the motor boost module drops to the point where the voltage of the pre-charge capacitor is stable, the boosting process begins.

9. A staged control method for vehicle boost charging, characterized in that, include: The voltage boosting process is divided into three stages: preparation stage, start-up stage, and execution stage. The control motor and voltage boosting module are activated to charge the battery pack. During the boost phase: the voltage fluctuation of the pre-charge capacitor in the charging circuit is monitored, and the upper limit of the charging pile's output capacity is determined based on the current output by the motor boost module and the preset target value, so as to adjust the current output by the motor boost module in real time.

10. A battery management controller, characterized in that, The stage control method for performing vehicle boost charging as described in any one of claims 1 to 9.

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