Battery charging method, device, vehicle, storage medium and program product

Abstract

The application discloses a battery charging method and device, a vehicle, a storage medium and a program product, and belongs to the technical field of vehicles. The method comprises the following steps: acquiring a state parameter of a battery of a vehicle, the state parameter comprising at least one of a state of charge SOC, a battery temperature and a state of health SOH; determining a target charging current corresponding to the state parameter, and determining a target charging voltage corresponding to the target charging current; adjusting a charging voltage of the battery to the target charging voltage, and charging the battery based on the target charging voltage. The application determines the target charging current based on the state parameter of the battery, charges the battery based on the target charging voltage corresponding to the target charging current, so as to improve the charging efficiency of the battery and reduce the damage to the service life of the battery.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a battery charging method, apparatus, vehicle, storage medium, and program product. Background Technology

[0002] With the rapid development of new energy technologies, electricity has gradually become one of the main energy sources for vehicles. Vehicles typically carry a power battery (also known as a high-voltage battery) and a storage battery (also known as a low-voltage battery). The power battery provides power to the vehicle, while the storage battery provides energy for some or all of the load. However, with the increasing intelligence and connectivity of vehicle technology, the electrical loads on the vehicle body are also increasing, posing a significant challenge to the power supply capacity of the vehicle's storage batteries.

[0003] In related technologies, a power battery can typically charge a storage battery when it is at risk of being depleted, ensuring the battery maintains a high state of charge and thus improving its range. However, charging the battery usually follows a fixed charging pattern, which cannot meet the charging needs of the battery in different scenarios. This results in poor charging efficiency and can easily damage the battery's lifespan. Summary of the Invention

[0004] This application provides a battery charging method, apparatus, vehicle, storage medium, and program product, which can improve battery charging efficiency and reduce damage to battery life. The technical solution is as follows:

[0005] On one hand, a method for charging a storage battery is provided, the method comprising:

[0006] Obtain the state parameters of the vehicle's battery, including at least one of the state of charge (SOC), battery temperature, and state of battery health (SOH);

[0007] Determine the target charging current corresponding to the state parameter, and determine the target charging voltage corresponding to the target charging current;

[0008] The charging voltage of the battery is adjusted to the target charging voltage, and the battery is charged based on the target charging voltage.

[0009] Optionally, determining the target charging current corresponding to the state parameter includes:

[0010] Based on the state parameters of the battery and the first mapping relationship, the upper current threshold and lower current threshold corresponding to the battery are determined. The first mapping relationship is used to indicate the mapping relationship between the state parameters of the battery, the upper current threshold and the lower current threshold.

[0011] Based on the upper current threshold, the lower current threshold, and the initial SOC, the theoretical upper SOC and theoretical lower SOC corresponding to the battery are determined. The initial SOC refers to the SOC of the battery at the start of this charging. The theoretical upper SOC is greater than the theoretical lower SOC.

[0012] Based on the theoretical upper limit of SOC, the theoretical lower limit of SOC, and the current SOC of the battery, the target current change is determined;

[0013] Based on the target current change, the historical charging current is adjusted, and the adjusted historical charging current is determined as the target charging current. The historical charging current refers to the charging current at the previous moment during the current charging process of the battery.

[0014] Optionally, determining the target charging voltage corresponding to the target charging current includes:

[0015] Determine the current difference between the target charging current and the current charging current of the battery;

[0016] Based on proportional, integral and derivative control algorithms, the theoretical voltage corresponding to the current difference is determined;

[0017] The target charging voltage corresponding to the target charging current is determined based on the theoretical voltage.

[0018] Optionally, determining the target charging voltage corresponding to the target charging current based on the theoretical voltage includes:

[0019] Based on the current SOC and / or current battery temperature of the battery, and the second mapping relationship, the charging voltage threshold corresponding to the battery is determined. The second mapping relationship is used to indicate the mapping relationship between the SOC, battery temperature and charging voltage threshold of the battery.

[0020] Based on the charging voltage threshold, the theoretical voltage is corrected, and the corrected theoretical voltage is determined as the target charging voltage.

[0021] Optionally, the charging voltage threshold includes an upper charging voltage threshold and a lower charging voltage threshold, wherein the upper charging voltage threshold is greater than the lower charging voltage threshold, and the step of correcting the theoretical voltage based on the charging voltage threshold includes:

[0022] If the theoretical voltage is greater than the upper limit threshold of the charging voltage, the theoretical voltage is corrected to the upper limit threshold of the charging voltage.

[0023] If the theoretical voltage is less than the lower limit threshold of the charging voltage, the theoretical voltage is corrected to the lower limit threshold of the charging voltage.

[0024] Optionally, the method further includes:

[0025] Obtain the rated power consumption of the current electrical load of the vehicle;

[0026] When the rated power consumption is greater than the power threshold and the current SOC of the battery is less than the SOC threshold, the target SOC range of the current SOC is determined. Different SOC ranges correspond to different power loads and / or different power consumption levels of the power load.

[0027] The vehicle's electrical load is controlled based on the target electrical load corresponding to the target SOC range and / or the target power consumption level of the target electrical load.

[0028] On the other hand, a battery charging device is provided, the device comprising:

[0029] The parameter acquisition module is used to acquire the state parameters of the vehicle's battery, including at least one of the state of charge (SOC), battery temperature, and state of battery health (SOH).

[0030] A current determination module is used to determine the target charging current corresponding to the state parameters;

[0031] A voltage determination module is used to determine the target charging voltage corresponding to the target charging current;

[0032] A voltage adjustment module is used to adjust the charging voltage of the battery to the target charging voltage, and to charge the battery based on the target charging voltage.

[0033] Optionally, the current determination module is specifically used for:

[0034] Based on the state parameters of the battery and the first mapping relationship, the upper current threshold and lower current threshold corresponding to the battery are determined. The first mapping relationship is used to indicate the mapping relationship between the state parameters of the battery, the upper current threshold and the lower current threshold.

[0035] Based on the upper current threshold, the lower current threshold, and the initial SOC, the theoretical upper SOC and theoretical lower SOC corresponding to the battery are determined. The initial SOC refers to the SOC of the battery at the start of this charging. The theoretical upper SOC is greater than the theoretical lower SOC.

[0036] Based on the theoretical upper limit of SOC, the theoretical lower limit of SOC, and the current SOC of the battery, the target current change is determined;

[0037] Based on the target current change, the historical charging current is adjusted, and the adjusted historical charging current is determined as the target charging current. The historical charging current refers to the charging current at the previous moment during the current charging process of the battery.

[0038] Optionally, the voltage determination module is specifically used for:

[0039] Determine the current difference between the target charging current and the current charging current of the battery;

[0040] Based on proportional, integral and derivative control algorithms, the theoretical voltage corresponding to the current difference is determined;

[0041] The target charging voltage corresponding to the target charging current is determined based on the theoretical voltage.

[0042] Optionally, the voltage determination module is further configured to:

[0043] Based on the current SOC and / or current battery temperature of the battery, and the second mapping relationship, the charging voltage threshold corresponding to the battery is determined. The second mapping relationship is used to indicate the mapping relationship between the SOC, battery temperature and charging voltage threshold of the battery.

[0044] Based on the charging voltage threshold, the theoretical voltage is corrected, and the corrected theoretical voltage is determined as the target charging voltage.

[0045] Optionally, the charging voltage threshold includes an upper charging voltage threshold and a lower charging voltage threshold, wherein the upper charging voltage threshold is greater than the lower charging voltage threshold, and the voltage determination module is specifically used for:

[0046] If the theoretical voltage is greater than the upper limit threshold of the charging voltage, the theoretical voltage is corrected to the upper limit threshold of the charging voltage.

[0047] If the theoretical voltage is less than the lower limit threshold of the charging voltage, the theoretical voltage is corrected to the lower limit threshold of the charging voltage.

[0048] Optionally, the device further includes a load control module;

[0049] The parameter acquisition module is also used to acquire the rated power of the current electrical load of the vehicle;

[0050] The load control module is used to determine the target SOC range of the current SOC when the rated power consumption is greater than the power threshold and the current SOC of the battery is less than the SOC threshold. Different SOC ranges correspond to different power loads and / or different power consumption levels of the power loads. Based on the target power load corresponding to the target SOC range and / or the target power consumption level of the target power load, the module controls the power load of the vehicle.

[0051] On the other hand, a vehicle is provided, the vehicle including a memory and a controller, the memory for storing a computer program, and the controller for executing the computer program stored in the memory to implement the steps of the battery charging method described above.

[0052] On the other hand, a non-transitory computer-readable storage medium is provided, wherein a computer program is stored therein, and when the computer program is executed by a controller, it implements the steps of the battery charging method described above.

[0053] On the other hand, a computer program product containing instructions is provided that, when the instructions are executed on a computer, causes the computer to perform the steps of the battery charging method described above.

[0054] The technical solution provided in this application can bring at least the following beneficial effects:

[0055] Since current is a parameter that directly affects battery charging efficiency and battery life, determining the target charging current based on the battery's state parameters can balance charging efficiency and its impact on battery life. Furthermore, charging the battery based on the target charging voltage corresponding to the target charging current allows for continuous adjustment of the battery's charging voltage according to the target charging current required in different battery states. This enables precise control during the battery charging process, improving charging efficiency and reducing damage to battery life. Attached Figure Description

[0056] To more clearly illustrate the technical solutions in the embodiments of this application, 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 This is a schematic diagram of an implementation environment provided in an embodiment of this application;

[0058] Figure 2 This is a flowchart of a battery charging method provided in an embodiment of this application;

[0059] Figure 3 This is a schematic diagram of the structure of a battery charging device provided in an embodiment of this application;

[0060] Figure 4 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0062] Before providing a detailed explanation of the battery charging method provided in the embodiments of this application, the implementation environment involved in the embodiments of this application will be introduced first.

[0063] Please refer to Figure 1 , Figure 1 This is a schematic diagram illustrating an implementation environment according to an exemplary embodiment. The implementation environment includes a power battery 101, a controller 102, a storage battery 103, and a battery management system 104.

[0064] The power battery 101 is used to charge the storage battery 103. Typically, for new energy vehicles, the power battery 101 is also used to provide power to the vehicle.

[0065] In some embodiments, the current output by the power battery 101 is a high-voltage current. For example... Figure 1 As shown, a DC-DC converter, i.e., a DCDC converter, can also be connected between the power battery 101 and the storage battery 103 to adjust the output voltage of the power battery 101 so as to replenish the storage battery 103 with electrical energy based on the charging voltage required by the storage battery 103. At this time, the controller 102 can be connected to the DCDC converter to adjust the output voltage of the DCDC converter and realize the control of the charging voltage of the storage battery.

[0066] The controller 102 is used to adjust the output voltage of the power battery 101. For example, the controller 102 can adjust the output voltage of the power battery 101 based on the state parameters of the battery collected by the battery management system 104.

[0067] The storage battery 103 is used to provide electrical energy. For example, the storage battery 103 can be connected to multiple electrical loads to provide electrical energy to the multiple electrical loads.

[0068] The battery management system 103 is used to obtain the status parameters of the battery 103.

[0069] Optionally, the battery management system 103 can be the vehicle's BMS (Battery Management System) for detecting and monitoring parameters such as voltage, current, temperature, SOC (State of Charge), and SOH (State of Health) of the battery 103.

[0070] The battery charging method provided in this application embodiment is executed by the controller 102 described above. The controller 102 can be a general-purpose CPU (Central Processing Unit), NP (Network Processor), microprocessor, or one or more integrated circuits used to implement the solution of this application, such as ASIC (Application-Specific Integrated Circuit), PLD (Programmable Logic Device), or a combination thereof. The PLD can be CPLD (Complex Programmable Logic Device), FPGA (Field-Programmable Gate Array), GAL (Generic Array Logic), or any combination thereof.

[0071] Those skilled in the art should understand that the power battery 101, controller 102, storage battery 103, and battery management system 104 described above are merely examples. Other existing or future power batteries, controllers, storage batteries, and battery management systems that are applicable to the embodiments of this application should also be included within the scope of protection of the embodiments of this application, and are hereby incorporated by reference.

[0072] It should be noted that the implementation environment described in the embodiments of this application is for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and does not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, as the implementation environment evolves, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0073] The battery charging method provided in the embodiments of this application will now be explained in detail.

[0074] Figure 2 This is a flowchart illustrating a battery charging method provided in an embodiment of this application, which is applied to the aforementioned controller. Please refer to... Figure 2 The method includes the following steps.

[0075] Step 201: Obtain the state parameters of the vehicle's battery, including at least one of SOC, battery temperature, and SOH.

[0076] Among them, SOC, or State of Charge, indicates the percentage of the battery's remaining charge relative to its rated capacity, i.e., the current remaining capacity of the battery; battery temperature indicates the current temperature of the battery; and SOH, or State of Health, indicates the ratio of the battery's maximum capacity to its initial or nominal maximum capacity, i.e., the battery's state of wear and tear.

[0077] It is understood that step 201 is executed when the battery is in a charging state. In some embodiments, the execution conditions for battery charging can be flexibly determined based on the actual usage scenario, meaning the execution conditions of step 201 will change based on the actual usage scenario of the vehicle. For example, when the vehicle is in motion, the vehicle's power battery is usually in a powered-on state, meaning the power battery continuously outputs electrical energy to charge the battery. At this time, the controller can obtain the battery's state parameters in real time to achieve battery charging control. After the vehicle is powered off, the vehicle's power battery is usually in a dormant state. At this time, in order to improve the vehicle's energy utilization efficiency, the battery can be charged when its charge level is low. That is, after the vehicle is powered off, the controller controls the battery to enter a charging state when the battery charge level is low and obtains the battery's state parameters to achieve battery charging control.

[0078] For example, after the vehicle is powered off, the battery's State of Charge (SOC) can be periodically acquired. If the battery's SOC is lower than a first low charge threshold, the battery is considered to have low charge and needs to be recharged. At this time, the controller can control the power battery to power on, that is, control the power battery to enter the working state, thereby charging the battery through the power battery. In other words, after the vehicle is powered off, the controller can control the power battery to charge the battery and execute step 201 when the battery's SOC is lower than the first low charge threshold.

[0079] Step 202: Determine the target charging current corresponding to the state parameters, and determine the target charging voltage corresponding to the target charging current.

[0080] In some embodiments, the upper current threshold and lower current threshold of the battery can be determined based on the battery's state parameters and a first mapping relationship. The first mapping relationship indicates the mapping relationship between the battery's state parameters, the upper current threshold, and the lower current threshold. Based on the upper current threshold, the lower current threshold, and the initial SOC, the upper theoretical SOC and lower theoretical SOC of the battery are determined. The initial SOC refers to the SOC of the battery at the start of this charging cycle, and the upper theoretical SOC is greater than the lower theoretical SOC. Based on the upper theoretical SOC, the lower theoretical SOC, and the current SOC of the battery, the target current change is determined. Based on the target current change, the historical charging current is adjusted, and the adjusted historical charging current is determined as the target charging current. The historical charging current refers to the charging current at the previous moment during the current charging process of the battery.

[0081] In some embodiments, the mapping relationship between the battery's state parameters, upper current threshold, and lower current threshold can be determined based on experimental statistical data, thereby obtaining a first mapping relationship.

[0082] For example, the first mapping relationship may include mapping relationship A, mapping relationship B, and mapping relationship C. Mapping relationship A corresponds to the battery's State of Charge (SOC) and indicates the mapping relationship between SOC, upper current threshold, and lower current threshold. Mapping relationship B corresponds to the battery's battery temperature and indicates the mapping relationship between battery temperature, upper current threshold, and lower current threshold. Mapping relationship C corresponds to the battery's State of Hypothesis (SOH) and indicates the mapping relationship between SOH, upper current threshold, and lower current threshold. Mapping relationships A, B, and C can be determined based on experimental statistical data and can be either mapping relationship functions or mapping relationships (maps). Then, based on the battery's state parameters and the corresponding mapping relationships in mapping relationships A, B, and C, the upper current threshold and lower current threshold corresponding to the battery are determined.

[0083] Taking the state parameters of a battery, including SOC and SOH, as an example, the first upper current threshold and the first lower current threshold corresponding to SOC can be determined based on mapping relationship A; the second upper current threshold and the second lower current threshold corresponding to SOH can be determined based on mapping relationship C; and then the upper current threshold and the lower current threshold corresponding to the battery can be determined based on the first upper current threshold, the second upper current threshold, the first lower current threshold and the second lower current threshold.

[0084] The method for determining the upper and lower current thresholds for the battery, based on the first upper current threshold, the second upper current threshold, the first lower current threshold, and the second lower current threshold, can be flexibly set according to actual usage requirements. For example, the maximum value between the first and second upper current thresholds can be determined as the upper current threshold for the battery, and the minimum value between the first and second lower current thresholds can be determined as the lower current threshold for the battery.

[0085] In some embodiments, the charging duration between the current moment and the initial moment can be determined, where the initial moment refers to the start moment of the current charging of the battery. Then, based on the upper current threshold and the charging duration, the theoretical upper limit of the battery's SOC change can be determined by the ampere-hour integration method when the charging duration reaches the upper current threshold. Similarly, based on the lower current threshold and the charging duration, the theoretical lower limit of the battery's SOC change can be determined by the ampere-hour integration method when the charging duration reaches the lower current threshold.

[0086] Furthermore, based on the initial SOC and the upper limit of the theoretical SOC change, the upper limit of the theoretical SOC corresponding to the battery is determined, and based on the initial SOC and the lower limit of the theoretical SOC change, the lower limit of the theoretical SOC corresponding to the battery is determined.

[0087] For example, during this charging process, the initial SOC of the battery is 20%, and the charging time between the current moment and the initial moment is 30 minutes. Assuming that the upper current threshold for the battery, determined based on the first mapping relationship, is 10A and the lower current threshold is 6A, based on the ampere-hour integration method, the first theoretical SOC change obtained by continuously charging the battery at 10A for 30 minutes is determined, and this first theoretical SOC change is defined as the theoretical SOC change upper limit. The second theoretical SOC change obtained by continuously charging the battery at 6A for 30 minutes is determined, and this second theoretical SOC change is defined as the theoretical SOC change lower limit.

[0088] Furthermore, the sum of the first theoretical SOC change and the initial SOC is determined as the upper limit of the theoretical SOC, and the sum of the second theoretical SOC change and the initial SOC is determined as the lower limit of the theoretical SOC. For example, if the determined first theoretical SOC change is 10% and the second theoretical SOC change is 5%, then the upper limit of the theoretical SOC is 30%, and the lower limit of the theoretical SOC is 25%.

[0089] In some embodiments, the target current change can be determined based on the relationship between the current SOC of the battery and the theoretical upper and lower limits of SOC, and then the historical charging current can be adjusted based on the target current change to obtain the target charging current.

[0090] For example, if the current SOC of the battery is greater than the theoretical upper limit of SOC, it indicates that the SOC of the battery is rising too fast, that is, the charging current of the battery is too large. Therefore, the historical charging current can be reduced and the reduced historical charging current can be determined as the target charging current. If the current SOC of the battery is less than the theoretical lower limit of SOC, it indicates that the SOC of the battery is rising too slowly, that is, the charging current of the battery is too small. Therefore, the historical charging current can be increased and the increased historical charging current can be determined as the target charging current.

[0091] Optionally, the target current change can be a fixed value, that is, the historical charging current can be adjusted based on a fixed value. For example, when the historical charging current is reduced, the historical charging current can be reduced by 1A to obtain the target charging current; when the historical charging current is increased, the historical charging current can be increased by 1A to obtain the target charging current.

[0092] Optionally, the target current change can also be a change value. For example, the current adjustment value can be determined based on the difference between the current SOC and the theoretical upper limit and the theoretical lower limit of SOC, and then the historical charging current can be adjusted based on the current adjustment value to obtain the target charging current.

[0093] For example, a current adjustment algorithm can be identified. Based on the difference between the battery's current SOC and the theoretical SOC upper and lower limits, and using the current adjustment algorithm, a current adjustment value can be determined. This current adjustment value is then used to adjust the historical charging current. This current adjustment algorithm can be determined based on experimental statistical data or set based on actual usage needs and expert experience; no specific limitations are imposed here.

[0094] For example, if the current SOC of the battery is greater than the theoretical SOC limit, and the difference between the current SOC and the theoretical SOC limit is 3%, then the current adjustment value corresponding to 3% can be determined based on the current adjustment algorithm, and then the historical charging current can be adjusted based on this current adjustment value.

[0095] For example, if the current SOC of the battery is less than the theoretical lower limit of SOC, and the difference between the current SOC and the theoretical lower limit of SOC is -5%, then the current adjustment value corresponding to -5% can be determined based on the current adjustment algorithm, and then the historical charging current can be adjusted based on this current adjustment value.

[0096] In some embodiments, when the battery has just started charging, since there is no historical charging current at this time, the average value between the upper current threshold and the lower current threshold can be determined as the target charging current.

[0097] In addition, if the current SOC of the battery is greater than or equal to the theoretical lower limit and less than or equal to the theoretical upper limit, it indicates that the current charging current of the battery is normal. At this time, the target current change can be considered to be 0, that is, there is no need to adjust the historical charging current, and the historical charging current can be directly determined as the target charging current.

[0098] In some embodiments, the current difference between the target charging current and the current charging current of the battery can be determined; the theoretical voltage corresponding to the current difference can be determined based on the proportional, integral, and derivative control algorithm; and the target charging voltage corresponding to the target charging current can be determined based on the theoretical voltage.

[0099] It should be noted that proportional, integral, and derivative control, also known as PID control, refers to the control algorithm. P stands for proportional control, I for integral control, and D for derivative control. The specific control algorithm can be determined based on actual usage requirements. For example, based on different control requirements, the theoretical voltage corresponding to the voltage difference can be determined by PI algorithm, PD algorithm, PID algorithm, etc.

[0100] Since the logic of various PID control algorithms is basically the same, only the PID algorithm will be used as an example for explanation.

[0101] In the PID algorithm, there are proportional branches, integral branches, and differential branches. The proportional branch is used to determine the proportional correction parameter corresponding to the current difference, the integral branch is used to determine the integral correction parameter corresponding to the current difference, and the differential branch is used to determine the differential correction parameter corresponding to the current difference. Then, based on the proportional correction parameter, integral correction parameter, and differential correction parameter, the theoretical voltage corresponding to the current difference is determined.

[0102] In some embodiments, the sum of the proportional correction parameter, integral correction parameter, derivative correction parameter, and historical voltage can be determined as the theoretical voltage corresponding to the current difference.

[0103] Considering that the charging voltage that a battery can withstand varies under different conditions, such as different states of charge (SOC) or different battery temperatures, the theoretical voltage of the battery can be corrected based on its actual condition after the theoretical voltage is determined.

[0104] In some embodiments, the charging voltage threshold corresponding to the battery can be determined based on the current SOC and / or current battery temperature of the battery, as well as a second mapping relationship, wherein the second mapping relationship is used to indicate the mapping relationship between the battery's SOC, battery temperature, and charging voltage threshold; based on the charging voltage threshold, the theoretical voltage is corrected, and the corrected theoretical voltage is determined as the target charging voltage.

[0105] In some embodiments, a second mapping relationship can be obtained by determining the mapping relationship between the battery's SOC, battery temperature, and charging voltage threshold based on experimental statistical data.

[0106] For example, the second mapping relationship may include mapping relationship D and mapping relationship E, wherein mapping relationship D corresponds to the state of charge (SOC) of the battery and is used to indicate the mapping relationship between SOC and charging voltage threshold; mapping relationship E corresponds to the battery temperature and is used to indicate the mapping relationship between battery temperature and charging voltage threshold. These mapping relationships D and E can be determined based on experimental statistical data, and can be mapping relationship functions or mapping relationships such as maps. Then, based on the battery SOC and / or battery temperature, and the corresponding mapping relationships, the charging voltage threshold is determined.

[0107] Taking the determination of the charging voltage threshold corresponding to the battery based on the current SOC and current battery temperature as an example, the first charging voltage threshold corresponding to the current SOC of the battery can be determined based on the mapping relationship D, and the second charging voltage threshold corresponding to the current battery temperature can be determined based on the mapping relationship E. Then, the corresponding charging voltage threshold of the battery can be determined based on the first charging voltage threshold and the second charging voltage threshold.

[0108] In some embodiments, a voltage correction algorithm can be identified, and a correction value corresponding to the charging voltage threshold can be determined based on the voltage correction algorithm. Then, the theoretical voltage can be corrected based on the correction value to obtain the target charging voltage. The voltage correction algorithm can be determined based on experimental statistical data or set based on actual usage requirements and expert experience; no specific limitations are made here.

[0109] In other embodiments, the charging voltage threshold includes an upper charging voltage threshold and a lower charging voltage threshold. The upper charging voltage threshold is greater than the lower charging voltage threshold. If the theoretical voltage is greater than the upper charging voltage threshold, the theoretical voltage can be corrected to the upper charging voltage threshold; if the theoretical voltage is less than the lower charging voltage threshold, the theoretical voltage can be corrected to the lower charging voltage threshold.

[0110] Step 203: Adjust the battery charging voltage to the target charging voltage, and charge the battery based on the target charging voltage.

[0111] In some embodiments, the rated power consumption of the vehicle's current electrical load can be obtained; if the rated power consumption is greater than a power threshold and the current SOC of the battery is less than the SOC threshold, the target SOC range of the current SOC is determined, and different SOC ranges correspond to different electrical loads and / or different power consumption levels of the electrical loads; based on the target electrical load and / or the target power consumption level of the target electrical load corresponding to the target SOC range, the vehicle's electrical load is controlled.

[0112] Optionally, the controller can determine the electrical load currently in operation of the vehicle, and then determine the rated power consumption of the current electrical load based on the load power mapping relationship. The load power mapping relationship is used to indicate the mapping relationship between the electrical load and the rated power consumption.

[0113] It should be noted that when the rated power of the vehicle's current electrical load exceeds the power threshold, it indicates that the rated power of the current electrical load is relatively high. If the battery's current State of Charge (SOC) is less than the SOC threshold, then the battery is considered to be at risk of depletion. Considering that the urgency of the battery depletion risk varies depending on the current SOC, multiple SOC ranges can be defined based on the urgency of the risk, allowing for different control strategies to be implemented for different levels of urgency.

[0114] This power threshold can be determined based on actual usage needs. For example, considering that the high-voltage battery can supply power to the electrical load during battery charging, the rated discharge power of the high-voltage battery can be determined as the power threshold. In this case, if the rated power of the vehicle's current electrical load is greater than the power threshold, it indicates that the rated power of the current electrical load is too high, and the high-voltage battery can no longer meet the load's power needs. The battery needs to provide additional power, meaning it needs to discharge. However, if the battery's current SOC is less than the SOC threshold, it indicates that continuing to discharge the battery at its current SOC poses a risk of depletion. Therefore, the vehicle's electrical load can be controlled based on the target SOC range where the battery's current SOC is located.

[0115] Considering that a vehicle may have multiple electrical loads, and the importance of the functions provided by different electrical loads may vary—for example, safety loads (such as the dashboard and anti-theft system) are more important than entertainment loads (such as ambient lighting and car audio)—different SOC ranges can include different electrical loads to promptly shut down unnecessary loads based on changes in battery SOC.

[0116] For example, with a State of Charge (SOC) threshold of 20%, the SOC range includes three intervals: (0, 5%), (5%, 10%), and (10%, 20%). The (0, 5%) interval represents an extremely high level of urgency regarding the risk of battery depletion, and the target loads for this interval include loads A, B, and C. The (5%, 10%) interval represents a relatively high level of urgency regarding the risk of battery depletion, and the target loads for this interval include loads A, B, C, D, and E. The (10%, 20%) interval represents a relatively low level of urgency regarding the risk of battery depletion, and the target loads for this interval include loads A, B, C, D, E, F, and G. In other words, as the battery SOC decreases, the urgency of the risk of battery depletion increases, resulting in fewer loads supporting the operation, allowing for the timely shutdown of unnecessary loads and reducing battery power consumption.

[0117] In addition, considering that the power consumption of the same electrical load varies under different operating modes, such as light brightness and air conditioning fan speed, multiple power consumption levels can be assigned to the electrical load. The higher the power consumption level, the greater the power consumption of the load. This allows for adjustment of the power consumption level of the electrical load based on the different states of charge (SOC) of the battery.

[0118] For example, taking the three intervals (0, 5%), (5%, 10%), and (10%, 20%) as examples, the urgency of the power loss risk in the (0, 5%) interval is extremely high. The target loads corresponding to this interval include load A, load B, and load C, where the power consumption level of load A, load B, and load C is 1. The urgency of the power loss risk in the (5%, 10%) interval is relatively high. The target loads corresponding to this interval include load A, load B, load C, load D, and load E, where the power consumption level of load A, load B, and load C is 2, and the power consumption level of load D and load E is 1. The urgency of the power loss risk in the (10%, 20%) interval is relatively low. The target loads corresponding to this interval include load A, load B, load C, load D, load E, load F, and load G, where the power consumption level of load A, load B, and load C is 3, the power consumption level of load D and load E is 2, and the power consumption level of load F and load G is 1. In other words, as the battery's SOC decreases, the urgency of the risk of battery depletion increases, resulting in fewer loads supporting the operation and lower power consumption levels of those loads. This allows for the timely shutdown of unnecessary electrical loads and adjustment of their operating modes, thereby reducing battery power consumption.

[0119] It should be noted that controlling the vehicle's electrical load based on the target electrical load and / or the target power consumption level of the target electrical load corresponding to the target SOC range can be understood as allowing the vehicle's target electrical load to operate, and / or allowing the target electrical load to operate at the target power consumption level at most.

[0120] In some embodiments, as the battery SOC increases, the allowable target electrical load and the target power consumption level of the target electrical load can be continuously adjusted.

[0121] For example, if the current SOC of the battery is 7%, and the corresponding target SOC range is (5%, 10%), then based on the target load and target power consumption level corresponding to the target SOC range, the target load of the vehicle is controlled. That is, loads A, B, C, D, and E are currently supported, and the highest power consumption level for loads A, B, and C is 2, while the highest power consumption level for loads D and E is 1. As the battery continues to charge, the current SOC of the battery rises to 15%, and the corresponding target SOC range is (10%, 20%). At this point, in addition to supporting loads A, B, C, D, and E, loads F and G can also be supported; and the highest power consumption level for loads A, B, and C increases to 3, the highest power consumption level for loads D and E increases to 2, and the highest power consumption level for loads F and G is 1.

[0122] In some embodiments, the charging and discharging current, charging and discharging voltage, and battery temperature of the battery can also be acquired to detect battery faults and, when a battery fault occurs, control the battery to enter a dormant mode in a timely manner. For example, the MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) transistor in the main charging and discharging circuit inside the battery can be cut off to ensure that the internal circuit of the battery is not damaged due to charging and discharging faults.

[0123] For example, a battery may be considered to have an overcurrent fault if its charging / discharging current exceeds a current threshold; an overvoltage fault if its charging / discharging voltage exceeds a first voltage threshold; an undervoltage fault if its charging / discharging voltage falls below a second voltage threshold; and an overtemperature fault if its battery temperature exceeds a temperature threshold. The first voltage threshold is greater than the second voltage threshold. A battery may be considered faulty if any of these fault conditions are present.

[0124] In some embodiments, in order to more effectively protect the battery, a second low charge threshold can be set, which is less than the SOC threshold and the first low charge threshold. When the SOC threshold of the battery is less than the second low charge threshold, the battery charge is considered to be extremely low. At this time, the power supply circuit between the battery and all electrical loads can be cut off to prevent the battery from continuing to discharge, thereby ensuring that the battery will not suffer from serious power loss.

[0125] In this embodiment, the current state of the battery is determined by acquiring its state parameters. Based on these parameters, the theoretical charging current range, namely the upper and lower current thresholds, is determined. These thresholds are then used to determine the theoretical upper and lower SOC limits of the battery. Thus, by using the theoretical SOC limits, it can be determined whether the battery's current SOC is normal, thereby determining the target charging current required by the battery.

[0126] After determining the target charging current, the theoretical voltage corresponding to the voltage difference between the target charging current and the current charging current can be determined using proportional, integral, and derivative control algorithms. This theoretical voltage is then used to adjust the battery charging voltage, achieving precise control over battery charging. Furthermore, considering charging efficiency and safety during the charging process, the current charging voltage threshold of the battery can be determined based on the battery's state of charge (SOC) and temperature. This threshold represents the reasonable voltage required for the battery's current charging. The theoretical voltage is then corrected based on this threshold, and the corrected theoretical voltage is determined as the target charging voltage. This target charging voltage is then used to control the battery's charging.

[0127] Furthermore, considering the potential risk of battery depletion during charging, the rated charging power for the vehicle's current electrical load can be determined. Based on this rated charging power and power threshold, the current State of Charge (SOC) and its threshold, the risk of battery depletion can be assessed. Then, if the risk of battery depletion exists, the vehicle's electrical load can be controlled based on the current SOC range. This allows for control of the vehicle's electrical load during battery charging based on the battery's state of charge, preventing the risk of battery depletion and further improving safety during battery charging.

[0128] Figure 3 This is a schematic diagram of the structure of a battery charging device provided in an embodiment of this application. The battery charging device can be implemented by software, hardware, or a combination of both, forming part or all of a battery charging equipment. The battery charging equipment can be... Figure 1 The controller shown. Please refer to... Figure 3The device includes: a parameter acquisition module 301, a current determination module 302, a voltage determination module 303, and a voltage adjustment module 304.

[0129] The parameter acquisition module 301 is used to acquire the state parameters of the vehicle's battery, including at least one of SOC, battery temperature and SOH.

[0130] The current determination module 302 is used to determine the target charging current corresponding to the state parameters;

[0131] The voltage determination module 303 is used to determine the target charging voltage corresponding to the target charging current;

[0132] The voltage adjustment module 304 is used to adjust the charging voltage of the battery to the target charging voltage and charge the battery based on the target charging voltage.

[0133] Optionally, the current determination module 302 is specifically used for:

[0134] Based on the battery's state parameters and the first mapping relationship, the upper current threshold and lower current threshold corresponding to the battery are determined. The first mapping relationship is used to indicate the mapping relationship between the battery's state parameters, the upper current threshold, and the lower current threshold.

[0135] Based on the upper current threshold, lower current threshold and initial SOC, the theoretical upper SOC and theoretical lower SOC of the battery are determined. The initial SOC refers to the SOC of the battery at the beginning of this charge. The theoretical upper SOC is greater than the theoretical lower SOC.

[0136] The target current change is determined based on the theoretical upper limit of SOC, the theoretical lower limit of SOC, and the current SOC of the battery.

[0137] Based on the change in target current, the historical charging current is adjusted, and the adjusted historical charging current is determined as the target charging current. The historical charging current refers to the charging current at the previous moment during the current charging process of the battery.

[0138] Optionally, the voltage determination module 303 is specifically used for:

[0139] Determine the current difference between the target charging current and the current charging current of the battery;

[0140] Based on proportional, integral and derivative control algorithms, the theoretical voltage corresponding to the current difference is determined;

[0141] The target charging voltage corresponding to the target charging current is determined based on the theoretical voltage.

[0142] Optionally, the voltage determination module 303 is also used for:

[0143] Based on the current SOC and / or current battery temperature of the battery, and the second mapping relationship, the corresponding charging voltage threshold of the battery is determined. The second mapping relationship is used to indicate the mapping relationship between the SOC, battery temperature and charging voltage threshold of the battery.

[0144] Based on the charging voltage threshold, the theoretical voltage is corrected, and the corrected theoretical voltage is determined as the target charging voltage.

[0145] Optionally, the charging voltage threshold includes an upper charging voltage threshold and a lower charging voltage threshold, wherein the upper charging voltage threshold is greater than the lower charging voltage threshold. The voltage determination module 303 is specifically used for:

[0146] If the theoretical voltage is greater than the upper limit threshold of the charging voltage, the theoretical voltage will be corrected to the upper limit threshold of the charging voltage.

[0147] If the theoretical voltage is lower than the lower limit threshold of the charging voltage, the theoretical voltage will be corrected to the lower limit threshold of the charging voltage.

[0148] Optionally, such as Figure 3 As shown, the device also includes a load control module 305;

[0149] The parameter acquisition module 301 is also used to acquire the rated power of the vehicle's current electrical load;

[0150] The load control module 305 is used to determine the target SOC range of the current SOC when the rated power consumption is greater than the power threshold and the current SOC of the battery is less than the SOC threshold. Different SOC ranges correspond to different electrical loads and / or different power consumption levels of the electrical loads. Based on the target electrical load and / or the target power consumption level of the target electrical load corresponding to the target SOC range, the load control module 305 controls the electrical load of the vehicle.

[0151] In this embodiment, the current state of the battery is determined by acquiring its state parameters. Based on these parameters, the theoretical charging current range, namely the upper and lower current thresholds, is determined. These thresholds are then used to determine the theoretical upper and lower SOC limits of the battery. Thus, by using the theoretical SOC limits, it can be determined whether the battery's current SOC is normal, thereby determining the target charging current required by the battery.

[0152] After determining the target charging current, the theoretical voltage corresponding to the voltage difference between the target charging current and the current charging current can be determined using proportional, integral, and derivative control algorithms. This theoretical voltage is then used to adjust the battery charging voltage, achieving precise control over battery charging. Furthermore, considering charging efficiency and safety during the charging process, the current charging voltage threshold of the battery can be determined based on the battery's state of charge (SOC) and temperature. This threshold represents the reasonable voltage required for the battery's current charging. The theoretical voltage is then corrected based on this threshold, and the corrected theoretical voltage is determined as the target charging voltage. This target charging voltage is then used to control the battery's charging.

[0153] Furthermore, considering the potential risk of battery depletion during charging, the rated charging power for the vehicle's current electrical load can be determined. Based on this rated charging power and power threshold, the current State of Charge (SOC) and its threshold, the risk of battery depletion can be assessed. Then, if the risk of battery depletion exists, the vehicle's electrical load can be controlled based on the current SOC range. This allows for control of the vehicle's electrical load during battery charging based on the battery's state of charge, preventing the risk of battery depletion and further improving safety during battery charging.

[0154] It should be noted that the battery charging device provided in the above embodiments is only illustrated by the division of the above functional modules when realizing battery charging. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the battery charging device and the battery charging method embodiments provided in the above embodiments belong to the same concept, and the specific implementation process can be found in the method embodiments, which will not be repeated here.

[0155] Figure 4 This is a structural block diagram of a vehicle 400 provided in an embodiment of this application. Typically, the vehicle 400 includes a controller 401 and a memory 402.

[0156] Controller 401 may include one or more processing cores, such as a quad-core processor, an octa-core processor, etc. Controller 401 may be implemented using at least one hardware form selected from DSP (Digital Signal Processing), FPGA (Field Programmable Gate Array), and PLA (Programmable Logic Array). Controller 401 may also include a main processor and a coprocessor. The main processor, also known as a CPU (Central Processing Unit), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, controller 401 may integrate a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, controller 401 may also include an AI (Artificial Intelligence) processor, which is used to handle computational operations related to machine learning.

[0157] The memory 402 may include one or more non-transitory computer-readable storage media. The memory 402 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In some embodiments, the non-transitory computer-readable storage media in the memory 402 are used to store at least one instruction, which is executed by the controller 401 to implement the battery charging method provided in the method embodiments of this application.

[0158] In some embodiments, a non-transitory computer-readable storage medium is also provided, which stores a computer program that, when executed by a controller, implements the steps of the battery charging method described above. For example, the non-transitory computer-readable storage medium may be a ROM, RAM, CD-ROM, magnetic tape, floppy disk, or optical data storage device.

[0159] It should be understood that all or part of the steps of the above embodiments can be implemented by software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented in whole or in part as a computer program product. The computer program product includes one or more computer instructions. The computer instructions can be stored in the above-mentioned non-transitory computer-readable storage medium.

[0160] That is, in some embodiments, a computer program product containing instructions is also provided, which, when run on a computer, causes the computer to perform the steps of the battery charging method described above.

[0161] It should be understood that "at least one" as mentioned herein refers to one or more, and "multiple" refers to two or more. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. In addition, in order to clearly describe the technical solutions of the embodiments of this application, the terms "first," "second," etc., are used in the embodiments of this application to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first," "second," etc., do not limit the quantity or execution order, and the terms "first," "second," etc., are not necessarily different.

[0162] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, data stored, data displayed, etc.) and signals involved in the embodiments of this application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0163] The above descriptions are embodiments provided in this application and are 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.

Claims

1. A method of charging a battery, characterized by, The method comprises: obtaining a state parameter of a battery of a vehicle, the state parameter comprising at least one of a state of charge SOC, a battery temperature and a state of health SOH of the battery; determining a target charging current corresponding to the state parameter, and determining a target charging voltage corresponding to the target charging current; adjusting a charging voltage of the battery to the target charging voltage, and charging the battery based on the target charging voltage; wherein the determination of the target charging current corresponding to the state parameter comprises: determining an upper current threshold and a lower current threshold corresponding to the battery based on the state parameter of the battery and a first mapping relationship, the first mapping relationship being used to indicate a mapping relationship among the state parameter of the battery, the upper current threshold and the lower current threshold; determining a theoretical upper SOC and a theoretical lower SOC corresponding to the battery based on the upper current threshold, the lower current threshold and an initial SOC, the initial SOC being an SOC at the beginning of the present charging of the battery, the theoretical upper SOC being greater than the theoretical lower SOC; determining a target current variation based on the theoretical upper SOC, the theoretical lower SOC and a current SOC of the battery; adjusting a historical charging current based on the target current variation, and determining the adjusted historical charging current as the target charging current, the historical charging current being a charging current at a previous time in the present charging process of the battery; wherein the determination of the target charging voltage corresponding to the target charging current comprises: determining a current difference between the target charging current and a current charging current of the battery; determining a theoretical voltage corresponding to the current difference based on a proportional, integral and differential control algorithm; determining the target charging voltage corresponding to the target charging current based on the theoretical voltage; wherein the determination of the target charging voltage corresponding to the target charging current based on the theoretical voltage comprises: determining a charging voltage threshold corresponding to the battery based on a current SOC and / or a current battery temperature of the battery and a second mapping relationship, the second mapping relationship being used to indicate a mapping relationship among the SOC, the battery temperature and the charging voltage threshold of the battery; correcting the theoretical voltage based on the charging voltage threshold, and determining the corrected theoretical voltage as the target charging voltage.

2. The method of claim 1, wherein, The charging voltage threshold comprises an upper charging voltage threshold and a lower charging voltage threshold, the upper charging voltage threshold being greater than the lower charging voltage threshold, and the correction of the theoretical voltage based on the charging voltage threshold comprises: in a case where the theoretical voltage is greater than the upper charging voltage threshold, correcting the theoretical voltage to the upper charging voltage threshold; in a case where the theoretical voltage is less than the lower charging voltage threshold, correcting the theoretical voltage to the lower charging voltage threshold.

3. The method of claim 1, wherein, The method further comprises: obtaining a rated power consumption of a current power consumption load of the vehicle; In a case where the rated power consumption is greater than the power threshold value and the current SOC of the battery is less than the SOC threshold value, a target SOC interval in which the current SOC is located is determined, different SOC intervals corresponding to different power consumptions and / or different power consumption levels of the power consumption; The power consumption of the vehicle is controlled based on a target power consumption corresponding to the target SOC interval and / or a target power consumption level of the target power consumption.

4. A battery charging device, characterized by comprising: The device comprises: A parameter acquisition module configured to acquire a state parameter of a battery of a vehicle, the state parameter comprising at least one of a state of charge (SOC), a battery temperature, and a state of health (SOH) of the battery; A current determination module configured to determine a target charging current corresponding to the state parameter; A voltage determination module configured to determine a target charging voltage corresponding to the target charging current; A voltage adjustment module configured to adjust a charging voltage of the battery to the target charging voltage and charge the battery based on the target charging voltage. The current determination module is specifically configured to: determine an upper current threshold and a lower current threshold corresponding to the battery based on the state parameter of the battery and a first mapping relationship, the first mapping relationship being used to indicate a mapping relationship among the state parameter of the battery, the upper current threshold, and the lower current threshold; determine a theoretical upper SOC and a theoretical lower SOC corresponding to the battery based on the upper current threshold, the lower current threshold, and an initial SOC, the initial SOC being an SOC at a start of the present charging of the battery, the theoretical upper SOC being greater than the theoretical lower SOC; determine a target current variation based on the theoretical upper SOC, the theoretical lower SOC, and a current SOC of the battery; adjust a historical charging current based on the target current variation and determine the adjusted historical charging current as the target charging current, the historical charging current being a charging current at a previous time in the present charging process of the battery. The voltage determination module is specifically configured to: determine a current difference between the target charging current and a current charging current of the battery; determine a theoretical voltage corresponding to the current difference based on a proportional, integral, and differential control algorithm; determine the target charging voltage corresponding to the target charging current based on the theoretical voltage; The voltage determination module is specifically configured to: determine a charging voltage threshold corresponding to the battery based on the current SOC and / or a current battery temperature of the battery and a second mapping relationship, the second mapping relationship being used to indicate a mapping relationship among the SOC, the battery temperature, and the charging voltage threshold of the battery; correct the theoretical voltage based on the charging voltage threshold and determine the corrected theoretical voltage as the target charging voltage.

5. A vehicle characterized by comprising: The vehicle comprises a memory and a controller, the memory being used to store a computer program, and the controller being used to execute the computer program stored in the memory to implement the steps of the method according to any one of claims 1-3.

6. A non-transitory computer-readable storage medium, comprising: The computer program is stored in the storage medium and enables the steps of the method according to any one of claims 1-3 when executed by the controller.

7. A computer program product comprising instructions, characterized in that, The instructions, when run on the computer, cause the computer to perform the steps of the method according to any one of claims 1-3.

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