A method and system for controlling the charging of automotive batteries

Abstract

This invention discloses a method and system for controlling vehicle battery charging, relating to the automotive field. The method includes: an interactive charging system; acquiring available data; calculating the available charging current; acquiring a first weight, acquiring a second weight, and taking the minimum of the first and second weights to obtain a third weight; multiplying the available charging current by the third weight to obtain a set charging current; acquiring the battery internal resistance based on battery temperature and SOC, and multiplying the battery internal resistance by the set charging current to obtain the battery internal resistance voltage; acquiring the OCV voltage and the corrected total battery voltage; acquiring a corresponding preset differential voltage window value, and adding the preset differential voltage window value to the corrected total battery voltage to obtain a limiting charging voltage; and sending the set charging current and the limiting charging voltage as control signals to the charger. This solves the technical problem of difficulty in real-time monitoring of battery status in existing technologies, achieving safe and efficient battery charging.

Description

Technical Field

[0001] This invention relates to the automotive field, and more specifically to a method and system for controlling the charging of automotive batteries. Background Technology

[0002] With the rapid growth of the global economy, environmental pollution has followed, making green and environmentally friendly practices a topic of great concern. While automobiles provide convenience, they also contribute to urban air pollution. Plug-in hybrid electric vehicles (PHEVs) combine the power of traditional cars with the environmental friendliness and economy of pure electric vehicles, making them stand out among many new energy vehicles. Charging is a primary function of PHEVs, and how to charge the battery safely and efficiently is a key focus. Safe and efficient charging control methods not only ensure vehicle safety and improve battery utilization and lifespan but also reduce charging time. However, traditional vehicle battery charging methods often lack precise monitoring of battery status, which can lead to overcharging or undercharging, affecting battery life and performance, and even causing safety issues. Summary of the Invention

[0003] This application provides a method and system for controlling the charging of a vehicle battery, which solves the technical problem of difficulty in real-time monitoring of battery status in the prior art.

[0004] In view of the above problems, this application provides a method and system for controlling the charging of a vehicle battery.

[0005] A first aspect of this application provides a vehicle battery charging control method, the method comprising:

[0006] An interactive charging system acquires available data, including maximum output power, battery rechargeable power, real-time total battery voltage, maximum voltage of individual cells, battery temperature, and SOC.

[0007] Based on the maximum output power and the battery rechargeable power, combined with the real-time total battery voltage, the available charging current is calculated.

[0008] The first weight is obtained by looking up the table based on the real-time total battery voltage of the first data structure, the second weight is obtained by looking up the table based on the highest voltage of the battery cell of the second data structure, and the minimum value of the first weight and the second weight is taken to obtain the third weight. The lookup value of the data structure is obtained by calibration.

[0009] Multiply the available charging current by the third weight to obtain the set charging current output by the set charger;

[0010] Based on battery temperature and SOC, the battery internal resistance is obtained by looking up the fourth data structure in the table. The battery internal resistance is then multiplied by the set charging current to obtain the battery internal resistance voltage.

[0011] Based on battery temperature and SOC, the OCV voltage is obtained by looking up the fifth data structure in the table. The corrected total battery voltage is obtained according to the third weight, the battery internal resistance voltage, and the OCV voltage.

[0012] Based on the set charging current, the corresponding preset differential voltage window value is obtained by looking up the third data structure of the table. The corrected total battery voltage is added to the preset differential voltage window value to obtain the limiting charging voltage that limits the output of the charger.

[0013] The set charging current and the limited charging voltage are sent to the charger as control signals.

[0014] A second aspect of this application provides a vehicle battery charging control system, the system comprising:

[0015] The data acquisition module is used to interact with the charging system and acquire available data, including maximum output power, battery rechargeable power, real-time total battery voltage, maximum voltage of a single cell, battery temperature, and SOC.

[0016] The first calculation module is used to calculate the available charging current based on the maximum output power and the battery rechargeable power, combined with the real-time battery total voltage.

[0017] The weight acquisition module is used to obtain a first weight based on the real-time total battery voltage by looking up a first data structure, obtain a second weight based on the highest voltage of a single battery cell by looking up a second data structure, and obtain a third weight by taking the minimum value of the first weight and the second weight. The lookup value of the data structure is obtained by calibration.

[0018] The second calculation module is used to multiply the available charging current by the third weight to obtain the set charging current output by the set charger;

[0019] An internal resistance acquisition module is used to obtain the battery internal resistance based on the battery temperature and SOC by looking up the fourth data structure of the table, and to obtain the battery internal resistance voltage by multiplying the battery internal resistance by the set charging current.

[0020] The voltage acquisition module is used to obtain the OCV voltage by looking up the fifth data structure of the table based on the battery temperature and SOC, and to obtain the corrected total battery voltage according to the third weight, the battery internal resistance voltage, and the OCV voltage.

[0021] The voltage limiting module is used to obtain the corresponding preset differential voltage window value by looking up a table third data structure based on the set charging current, and add the preset differential voltage window value to the corrected total battery voltage to obtain the limiting charging voltage that limits the output of the charger.

[0022] The transmitting module is used to send the set charging current and the limited charging voltage as control signals to the charger.

[0023] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0024] The interactive charging system acquires available data, including maximum output power, battery rechargeable power, real-time total battery voltage, maximum single-cell voltage, battery temperature, and SOC. Based on the maximum output power and battery rechargeable power, combined with the real-time total battery voltage, the available charging current is calculated. Next, the system obtains a first weight and a second weight by looking up the first and second data structures, respectively. The first weight is based on the real-time total battery voltage, and the second weight is based on the maximum single-cell voltage. The minimum value of the first and second weights is taken to obtain a third weight. Then, the system multiplies the available charging current by the third weight to obtain the set charging current output by the charger. Next, the system obtains the battery internal resistance by looking up the fourth data structure, multiplies the battery internal resistance by the set charging current, and obtains the battery internal resistance voltage. Then, the system obtains the OCV voltage by looking up the fifth data structure. Based on the third weight, battery internal resistance voltage, and OCV voltage, the corrected total battery voltage is obtained. Finally, based on the set charging current, the system obtains the corresponding preset differential voltage window value by looking up the third data structure. The system adjusts the total battery voltage and adds a preset differential voltage window value to obtain the limiting charging voltage that restricts the charger's output. Finally, the system sends the set charging current and limiting charging voltage as control signals to the charger. This solves the technical problem of difficulty in real-time monitoring of battery status in existing technologies, achieving safe and efficient battery charging. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic flowchart of a vehicle battery charging control method provided in an embodiment of this application;

[0027] Figure 2This is a schematic diagram of a vehicle battery charging control system provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures: Data acquisition module 11, first calculation module 12, weight acquisition module 13, second calculation module 14, internal resistance acquisition module 15, voltage acquisition module 16, voltage limiting module 17, and transmission module 18. Detailed Implementation

[0029] This application provides a vehicle battery charging control method and system, which solves the technical problem of difficulty in real-time monitoring of battery status in the prior art.

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] It should be noted that the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or modules that are not explicitly listed or that are inherent to such process, method, product, or device. Example 1

[0032] like Figure 1 As shown in the figure, this application provides a vehicle battery charging control method, wherein the method includes:

[0033] An interactive charging system acquires available data, including maximum output power, battery rechargeable power, real-time total battery voltage, maximum voltage of individual cells, battery temperature, and SOC.

[0034] By communicating with the interactive charging system, the system acquires available data, including maximum output power, battery rechargeable power, real-time total battery voltage, maximum voltage of individual cells, battery temperature, and state of charge (SOC), providing crucial reference for subsequent charging control. Maximum output power refers to the maximum charging power the charging equipment can provide, while battery rechargeable power refers to the maximum charging power the battery can accept in its current state. Real-time total battery voltage refers to the real-time voltage of the battery during charging, and maximum voltage of individual cells refers to the highest voltage of a single battery cell. Battery temperature and SOC represent the battery's temperature and state of charge, respectively, information that helps determine the battery's condition and performance. By acquiring this available data, the interactive charging system can achieve precise control of the battery charging process.

[0035] Based on the maximum output power and the battery rechargeable power, combined with the real-time total battery voltage, the available charging current is calculated.

[0036] The available charging current is calculated based on the charging device's maximum output power, the battery's current acceptable charging power, and the real-time total battery voltage. This calculation ensures that the charging current is within the battery's safe range, avoiding overcharging or undercharging.

[0037] Furthermore, based on the maximum output power and the battery rechargeable power, combined with the real-time total battery voltage, the available charging current is calculated, including:

[0038] By comparing the maximum output power and the battery rechargeable power, the minimum value is taken based on the comparison result to obtain the available power.

[0039] Divide the available power by the real-time total battery voltage to obtain the available charging current.

[0040] Optionally, the maximum output power and the battery's rechargeable power are compared, and the minimum value is taken to obtain the available power. Then, the available power is divided by the real-time total battery voltage to obtain the available charging current. This ensures that the provided charging power does not exceed the charging device's maximum output power or the battery's current maximum acceptable charging power, thus ensuring the safety and stability of the charging process. Specifically, available power = min(maximum output power, battery rechargeable power), and available charging current = available power / real-time total battery voltage.

[0041] The first weight is obtained by looking up the table based on the real-time total battery voltage of the first data structure, the second weight is obtained by looking up the table based on the highest voltage of the battery cell of the second data structure, and the minimum value of the first weight and the second weight is taken to obtain the third weight. The lookup value of the data structure is obtained by calibration.

[0042] Two data tables are used: one based on the real-time total battery voltage and the other on the highest voltage of a single battery cell, to obtain two weights. The minimum of these two weights is then taken as the third weight. These lookup values ​​for these data structures are obtained through a calibration process to ensure the accuracy and adaptability of the weights. Specifically, the first data structure is a pre-calibrated table where each row or node corresponds to a specific real-time total battery voltage, and the first weight is the weight corresponding to these real-time total battery voltages during the calibration process. Similarly, the second data structure may also be a pre-calibrated table where each row or node corresponds to a specific highest voltage of a single battery cell, and the second weight is the weight corresponding to these highest voltages during the calibration process. After obtaining the first and second weights through table lookups, the system takes the minimum of these two weights as the third weight. This is done to account for the complexity and safety of the battery during charging, ensuring that the charging current does not exceed the maximum acceptable value for the battery.

[0043] Furthermore, the methods include:

[0044] During the charging process, the changes in total battery voltage and individual cell voltage are monitored in real time to obtain and measure the total battery voltage and individual cell voltage.

[0045] Based on the measured total battery voltage and the measured individual battery cell voltage, obtain the first adjustment weight and the second adjustment weight;

[0046] The set charging current is dynamically adjusted based on the adjustment of the first weight value and the adjustment of the second weight value.

[0047] The battery's total voltage and individual cell voltages are monitored in real time using a Battery Management System (BMS) or other monitoring devices. The monitored data is then transmitted to a control system or data processing unit for further processing. Next, based on the measured total voltage and individual cell voltages, adjustment weights and adjustment weights are obtained. These adjustment weights are calculated based on the battery's real-time state (such as total voltage and individual cell voltage) and preset voltage thresholds. The adjustment weight is calculated based on the difference between the real-time total voltage and the preset total voltage threshold, reflecting changes in the total voltage and thus adjusting the charging current accordingly. If the total voltage is higher than the preset threshold, it indicates the battery is approaching its maximum acceptable charging power; in this case, the charging current should be reduced to prevent overcharging. Conversely, if the total voltage is lower than the preset threshold, it indicates the battery has room to accept higher charging power; in this case, the charging current can be increased to improve charging efficiency. The adjustment weight is calculated based on the difference between the real-time highest individual cell voltage and the preset individual cell voltage threshold, reflecting changes in individual cell voltage and thus adjusting the charging current accordingly. If the highest voltage of a single battery cell is higher than the preset threshold, it indicates that the battery is approaching its maximum acceptable charging power. In this case, the charging current should be reduced to prevent overcharging. Conversely, if the highest voltage of a single battery cell is lower than the preset threshold, it means the battery has room to accept higher charging power. In this case, the charging current can be increased to improve charging efficiency. For example, the first weight can be adjusted as follows: (Measured total battery voltage - Preset total battery voltage threshold) / (Maximum output voltage - Preset total battery voltage threshold); the second weight can be adjusted as follows: (Measured highest voltage of a single battery cell - Preset single battery cell voltage threshold) / (Highest voltage of a single battery cell - Preset single battery cell voltage threshold). Finally, the set charging current is dynamically adjusted based on the adjusted first and second weights. This can be achieved by comparing the adjusted weights with the original weights and taking the larger value. In this way, it can be ensured that the charging current meets the battery's accepting capacity while also fully utilizing the maximum output power of the charging device.

[0048] Furthermore, dynamically adjusting the set charging current based on adjusting the first weight and adjusting the second weight includes:

[0049] The larger the total voltage of the measured battery, the smaller the first adjustment weight; the larger the voltage of the measured individual battery cell, the smaller the second adjustment weight; wherein the first adjustment weight and the second adjustment weight are both (0, 1).

[0050] During battery charging, as the measured total battery voltage and the measured individual battery cell voltage increase, the set charging current gradually decreases.

[0051] During battery charging, as the total battery voltage increases, the battery's state of charge gradually approaches its maximum acceptable charging power. Therefore, to prevent overcharging, the charging current needs to be reduced. Similarly, the higher the measured individual battery voltage, the smaller the adjusted second weight, meaning that as the individual battery voltage increases, the charging current should gradually decrease. The adjusted first and second weights range from 0 to 1, representing real numbers between 0 and 1. Larger values ​​indicate a healthier battery state, capable of accepting higher charging currents; smaller values ​​indicate that the battery state is closer to its maximum acceptable charging power, requiring a reduction in charging current. This dynamic adjustment of the charging current ensures the safety and stability of the battery charging process.

[0052] Multiply the available charging current by the third weight to obtain the set charging current output by the set charger;

[0053] To further adjust the charging current, the battery's state and characteristics are taken into account. The third weight is obtained by minimizing the first and second weights, reflecting the battery's characteristics and state. By multiplying by the third weight, the available charging current can be further adjusted to suit the battery's characteristics, ensuring the charging current is within the battery's acceptable range and fully utilizing the charging device's maximum output power.

[0054] Based on battery temperature and SOC, the battery internal resistance is obtained by looking up the fourth data structure in the table. The battery internal resistance is then multiplied by the set charging current to obtain the battery internal resistance voltage.

[0055] The battery internal resistance is obtained by looking up the fourth data structure in the table. Then, the battery internal resistance is multiplied by the set charging current to obtain the battery internal resistance voltage. The fourth data structure is a pre-calibrated table where each row or node corresponds to a specific battery temperature and SOC combination, and the corresponding value is the battery internal resistance under that combination. Multiplying the battery internal resistance obtained from the table by the set charging current yields the battery internal resistance voltage. The battery internal resistance voltage can be used as the basis for further adjusting the charging voltage.

[0056] Based on battery temperature and SOC, the OCV voltage is obtained by looking up the fifth data structure in the table. The corrected total battery voltage is obtained according to the third weight, the battery internal resistance voltage, and the OCV voltage.

[0057] OCV voltage refers to the voltage of a battery in an open-circuit state (when no current flows through the battery). It can be used as an estimate of the battery's state of charge and has a certain relationship with the battery's SOC. The OCV voltage is obtained by looking up the fifth data structure in a table. This fifth data structure is a pre-calibrated table where each row or node corresponds to a specific combination of battery temperature and SOC, and the corresponding value is the OCV voltage for that combination. Then, the OCV voltage obtained from the table is combined with the third weight and the battery's internal resistance voltage to obtain the corrected total battery voltage.

[0058] Furthermore, obtaining the corrected total battery voltage based on the third weight, the battery internal resistance voltage, and the OCV voltage includes:

[0059] The first voltage is obtained by adding the battery internal resistance voltage to the OCV voltage;

[0060] Use the OCV voltage as the second voltage;

[0061] Using the third weight as a weight, the first voltage and the second voltage are weighted and calculated to obtain the total battery voltage. The weighting calculation formula is as follows:

[0062] U 总 =wU1+(1-w)U2

[0063] Among them, U 总 U1 is the total battery voltage, w is the third weighting value, U1 is the first voltage, and U2 is the second voltage.

[0064] The battery's internal resistance voltage is added to the OCV voltage to obtain the first voltage. The OCV voltage is then used as the second voltage. A third weight is used as the weight to perform a weighted calculation on the first and second voltages to obtain the total battery voltage. Through the above calculation, a more accurate estimate of the total battery voltage can be obtained.

[0065] Based on the set charging current, the corresponding preset differential voltage window value is obtained by looking up the third data structure of the table. The corrected total battery voltage is added to the preset differential voltage window value to obtain the limiting charging voltage that limits the output of the charger.

[0066] The third data structure is a pre-calibrated table where each row or node corresponds to a specific combination of set charging current and battery state of charge, and the corresponding value is the preset differential voltage window value for that combination. The preset differential voltage window value is used to prevent overcharging or undercharging of the battery, ensuring the safety and stability of the charging process. Next, the total battery voltage is adjusted by adding the preset differential voltage window value to obtain a limiting charging voltage. Limiting the charging voltage restricts the charger's output voltage, ensuring that the battery is not over- or under-voltage during charging.

[0067] Furthermore, this includes:

[0068] The lookup value of the third data structure is obtained through calibration. It includes different values ​​of the charger output current. Each value corresponds to a preset differential voltage window value, and the preset differential voltage window value satisfies the voltage difference between the charger output voltage and the battery total voltage.

[0069] The system considers different values ​​for the charger's output current, with each value corresponding to a preset differential voltage window. These preset differential voltage windows are designed to meet the voltage difference requirements between the charger's output voltage and the battery's total voltage. This calibration process ensures that the charger maintains a suitable differential voltage window under various output current conditions to prevent overcharging or undercharging of the battery. The preset differential voltage window values ​​can be stored as lookup values ​​in a third data structure for quick retrieval and use during real-time control.

[0070] The set charging current and the limited charging voltage are sent to the charger as control signals.

[0071] Setting the charging current and limiting the charging voltage can be used as input signals to the charger's controller. Based on these signals and data feedback from other sensors, the controller adjusts the charger's output current and voltage to ensure a safe, stable, and efficient battery charging process.

[0072] In summary, the embodiments of this application have at least the following technical effects:

[0073] The interactive charging system acquires available data, including maximum output power, battery rechargeable power, real-time total battery voltage, maximum single-cell voltage, battery temperature, and SOC. Based on the maximum output power and battery rechargeable power, combined with the real-time total battery voltage, the available charging current is calculated. Next, the system obtains a first weight and a second weight by looking up the first and second data structures, respectively. The first weight is based on the real-time total battery voltage, and the second weight is based on the maximum single-cell voltage. The minimum value of the first and second weights is taken to obtain a third weight. Then, the system multiplies the available charging current by the third weight to obtain the set charging current output by the charger. Next, the system obtains the battery internal resistance by looking up the fourth data structure, multiplies the battery internal resistance by the set charging current, and obtains the battery internal resistance voltage. Then, the system obtains the OCV voltage by looking up the fifth data structure. Based on the third weight, battery internal resistance voltage, and OCV voltage, the corrected total battery voltage is obtained. Finally, based on the set charging current, the system obtains the corresponding preset differential voltage window value by looking up the third data structure. The system adjusts the total battery voltage and adds a preset differential voltage window value to obtain the limiting charging voltage that restricts the charger's output. Finally, the system sends the set charging current and limiting charging voltage as control signals to the charger. This solves the technical problem of difficulty in real-time monitoring of battery status in existing technologies, achieving safe and efficient battery charging. Example 2

[0074] Based on the same inventive concept as the vehicle battery charging control method in the foregoing embodiments, such as Figure 2 As shown, this application provides a vehicle battery charging control system. The system and method embodiments in this application are based on the same inventive concept. The system includes:

[0075] The system includes a data acquisition module 11, a first calculation module 12, a weight acquisition module 13, a second calculation module 14, an internal resistance acquisition module 15, a voltage acquisition module 16, a voltage limiting module 17, and a transmission module 18.

[0076] Data acquisition module 11 is used in the interactive charging system to acquire available data, including maximum output power, battery rechargeable power, real-time total battery voltage, maximum voltage of a single cell, battery temperature, and SOC.

[0077] The first calculation module 12 is used to calculate the available charging current based on the maximum output power and the battery rechargeable power, combined with the real-time battery total voltage.

[0078] The weight acquisition module 13 is used to obtain a first weight based on the real-time total battery voltage lookup table of the first data structure, obtain a second weight based on the highest voltage of the battery cell lookup table of the second data structure, and obtain a third weight by taking the minimum value of the first weight and the second weight. The lookup value of the data structure is obtained by calibration.

[0079] The second calculation module 14 is used to multiply the available charging current by the third weight to obtain the set charging current output by the set charger.

[0080] Internal resistance acquisition module 15 is used to obtain the battery internal resistance based on battery temperature and SOC by looking up the fourth data structure of the table, and multiply the battery internal resistance by the set charging current to obtain the battery internal resistance voltage.

[0081] The voltage acquisition module 16 is used to obtain the OCV voltage by looking up the fifth data structure of the table based on the battery temperature and SOC, and to obtain the corrected total battery voltage according to the third weight, the battery internal resistance voltage and the OCV voltage.

[0082] Voltage limiting module 17 is used to obtain the corresponding preset differential voltage window value by looking up the third data structure of the table based on the set charging current, add the preset differential voltage window value to the corrected battery total voltage, and obtain the limiting charging voltage that limits the output of the charger.

[0083] The transmitting module 18 is used to send the set charging current and the limited charging voltage as control signals to the charger.

[0084] Furthermore, the weight acquisition module 13 is used to perform the following method:

[0085] During the charging process, the changes in total battery voltage and individual cell voltage are monitored in real time to obtain and measure the total battery voltage and individual cell voltage.

[0086] Based on the measured total battery voltage and the measured individual battery cell voltage, obtain the first adjustment weight and the second adjustment weight;

[0087] The set charging current is dynamically adjusted based on the adjustment of the first weight value and the adjustment of the second weight value.

[0088] Furthermore, the weight acquisition module 13 is used to perform the following method:

[0089] The larger the total battery voltage is, the smaller the first adjustment weight is; the larger the individual battery voltage is, the smaller the second adjustment weight is. The first adjustment weight and the second adjustment weight are both set to (0,1).

[0090] During battery charging, as the measured total battery voltage and the measured individual battery cell voltage increase, the set charging current gradually decreases.

[0091] Furthermore, the first calculation module 12 is used to perform the following method:

[0092] By comparing the maximum output power and the battery rechargeable power, the minimum value is taken based on the comparison result to obtain the available power.

[0093] Divide the available power by the real-time total battery voltage to obtain the available charging current.

[0094] Furthermore, the voltage acquisition module 16 is used to perform the following method:

[0095] The first voltage is obtained by adding the battery internal resistance voltage to the OCV voltage;

[0096] Use the OCV voltage as the second voltage;

[0097] Using the third weight as a weight, the first voltage and the second voltage are weighted and calculated to obtain the total battery voltage. The weighting calculation formula is as follows:

[0098] U 总 =wU1+(1-w)U2

[0099] Among them, U 总 U1 is the total battery voltage, w is the third weighting value, U1 is the first voltage, and U2 is the second voltage.

[0100] Furthermore, the voltage limiting module 17 is used to perform the following method:

[0101] The lookup value of the third data structure is obtained through calibration. It includes different values ​​of the charger output current. Each value corresponds to a preset differential voltage window value, and the preset differential voltage window value satisfies the voltage difference between the charger output voltage and the battery total voltage.

[0102] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, specific embodiments have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims can be performed in a different order than that shown in the embodiments and still achieve the desired result. Additionally, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0103] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0104] This specification and accompanying drawings are merely illustrative examples of this application and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Therefore, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A method for controlling the charging of a vehicle battery, characterized in that, include: An interactive charging system acquires available data, including maximum output power, battery rechargeable power, real-time total battery voltage, maximum voltage of individual cells, battery temperature, and SOC. Based on the maximum output power and the battery rechargeable power, combined with the real-time total battery voltage, the available charging current is calculated. The first weight is obtained by looking up the table of the real-time total battery voltage using the first data structure, and the second weight is obtained by looking up the table of the highest voltage of the battery cell using the second data structure. The minimum value of the first weight and the second weight is taken to obtain the third weight. The lookup value of the data structure is obtained by calibration. Multiply the available charging current by the third weight to obtain the set charging current output by the set charger; Based on battery temperature and SOC, the battery internal resistance is obtained by looking up the fourth data structure in the table. The battery internal resistance is then multiplied by the set charging current to obtain the battery internal resistance voltage. Based on battery temperature and SOC, the OCV voltage is obtained by looking up the fifth data structure in the table. The corrected total battery voltage is obtained according to the third weight, the battery internal resistance voltage, and the OCV voltage. Based on the set charging current, the corresponding preset differential voltage window value is obtained by looking up the third data structure of the table. The corrected total battery voltage is added to the preset differential voltage window value to obtain the limiting charging voltage that limits the output of the charger. The set charging current and the limited charging voltage are sent to the charger as control signals.

2. The method as described in claim 1, characterized in that, Also includes: During the charging process, the changes in total battery voltage and individual cell voltage are monitored in real time to obtain and measure the total battery voltage and individual cell voltage. Based on the measured total battery voltage and the measured individual battery cell voltage, obtain the first adjustment weight and the second adjustment weight; The set charging current is dynamically adjusted based on the adjustment of the first weight value and the adjustment of the second weight value.

3. The method as described in claim 2, characterized in that, The set charging current is dynamically adjusted according to the adjustment of the first weight value and the adjustment of the second weight value, including: The larger the total battery voltage is measured, the smaller the first adjustment weight; the larger the individual battery voltage is measured, the smaller the second adjustment weight; wherein the first adjustment weight and the second adjustment weight are both within the range of 0 to 1. During battery charging, as the measured total battery voltage and the measured individual battery cell voltage increase, the set charging current gradually decreases.

4. The method as described in claim 1, characterized in that, Based on the maximum output power and the battery rechargeable power, and in conjunction with the real-time total battery voltage, the available charging current is calculated, including: By comparing the maximum output power and the battery rechargeable power, the minimum value is taken based on the comparison result to obtain the available power. Divide the available power by the real-time total battery voltage to obtain the available charging current.

5. The method as described in claim 1, characterized in that, Based on the third weight, the battery internal resistance voltage, and the OCV voltage, the corrected total battery voltage is obtained, including: The first voltage is obtained by adding the battery internal resistance voltage to the OCV voltage; Use the OCV voltage as the second voltage; Using the third weight as a weight, the first voltage and the second voltage are weighted and calculated to obtain the total battery voltage. The weighting calculation formula is as follows: U 总 =wU1+(1-w)U2 Among them, U 总 U1 is the total battery voltage, w is the third weighting value, U1 is the first voltage, and U2 is the second voltage.

6. The method as described in claim 1, characterized in that, The lookup value of the third data structure is obtained through calibration. It includes different values ​​of the charger output current. Each value corresponds to a preset differential voltage window value, and the preset differential voltage window value satisfies the voltage difference between the charger output voltage and the battery total voltage.

7. A vehicle battery charging control system, characterized in that, The system includes: The data acquisition module is used to interact with the charging system and acquire available data, including maximum output power, battery rechargeable power, real-time total battery voltage, maximum voltage of a single cell, battery temperature, and SOC. The first calculation module is used to calculate the available charging current based on the maximum output power and the battery rechargeable power, combined with the real-time battery total voltage. The weight acquisition module is used to obtain a first weight based on the real-time total battery voltage by looking up a first data structure, obtain a second weight based on the highest voltage of a single battery cell by looking up a second data structure, and obtain a third weight by taking the minimum value of the first weight and the second weight. The lookup value of the data structure is obtained by calibration. The second calculation module is used to multiply the available charging current by the third weight to obtain the set charging current output by the set charger; An internal resistance acquisition module is used to obtain the battery internal resistance based on the battery temperature and SOC by looking up the fourth data structure of the table, and to obtain the battery internal resistance voltage by multiplying the battery internal resistance by the set charging current. The voltage acquisition module is used to obtain the OCV voltage by looking up the fifth data structure of the table based on the battery temperature and SOC, and to obtain the corrected total battery voltage according to the third weight, the battery internal resistance voltage, and the OCV voltage. The voltage limiting module is used to obtain the corresponding preset differential voltage window value by looking up a table third data structure based on the set charging current, and add the preset differential voltage window value to the corrected total battery voltage to obtain the limiting charging voltage that limits the output of the charger. The transmitting module is used to send the set charging current and the limited charging voltage as control signals to the charger.

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