Charging control method and device, vehicle, storage medium and program product

Abstract

The invention discloses a charging control method and device, a vehicle, a storage medium and a program product, and belongs to the field of vehicles. The method comprises the following steps: acquiring a current state of charge (SOC) of a storage battery in a charging process; determining a target charging voltage corresponding to the storage battery based on the current SOC; based on the target charging voltage and a historical charging voltage, correcting the target charging voltage, so that a difference value between the corrected target charging voltage and the historical charging voltage is smaller than or equal to a maximum jump threshold value, and the historical charging voltage is a charging voltage of the storage battery at the last moment in the current charging process; the maximum jump threshold value is used for indicating the maximum variable quantity of single adjustment of the charging voltage in the charging process of the storage battery; and charging the storage battery based on the corrected target charging voltage. According to the method, the target charging voltage is corrected, so that the charging voltage of the storage battery and the historical charging voltage at the previous moment can keep small voltage change, and the charging stability of the storage battery is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a charging control method, device, vehicle, storage medium and program product. Background Art

[0002] With the development of vehicle technology, vehicles are carrying more and more loads. Since the electric energy used by vehicle loads is usually low-voltage electricity, low-voltage batteries, that is, storage batteries, have been widely used in vehicles. However, due to the special usage scenarios of vehicles, the storage battery cannot be charged by an external power supply at any time. Based on this, in order to ensure that the battery power is always maintained at a healthy level, the vehicle usually charges the storage battery through the power battery on board.

[0003] In the process of charging the battery, as the charging scene changes, the charging voltage of the battery may change, which in turn affects the battery life of the battery, affects the battery structure of the battery, and may even cause safety hazards to the vehicle. Therefore, the current charging stability of the battery is poor. Summary of the invention

[0004] The present application provides a charging control method, device, vehicle, storage medium and program product, which can improve the charging stability of the battery. The technical solution is as follows:

[0005] In one aspect, a charging control method is provided, the method comprising:

[0006] Get the current state of charge SOC during battery charging;

[0007] Based on the current SOC, determining a target charging voltage corresponding to the battery;

[0008] Based on the target charging voltage and the historical charging voltage, the target charging voltage is corrected so that the difference between the corrected target charging voltage and the historical charging voltage is less than or equal to a maximum jump threshold, wherein the historical charging voltage is the charging voltage of the battery at the last moment during the current charging process, and the maximum jump threshold is used to indicate the maximum change amount of a single adjustment of the charging voltage during the charging process of the battery;

[0009] The battery is charged based on the corrected target charging voltage.

[0010] Optionally, determining a target charging voltage corresponding to the battery based on the current SOC includes:

[0011] Determine the SOC difference between the current SOC and the target SOC, and determine the target charging current corresponding to the SOC difference, wherein the target SOC refers to the SOC to be achieved by the battery during this charging;

[0012] Acquiring a current charging current of the battery, and determining a current difference between the current charging current and the target charging current;

[0013] A theoretical charging voltage corresponding to the current difference is determined, and the theoretical charging voltage is determined as the target charging voltage.

[0014] Optionally, the method further comprises:

[0015] Acquiring the current battery temperature during the battery charging process;

[0016] Based on the current battery temperature and the current SOC of the power battery, a target SOC corresponding to the storage battery is determined, where the power battery refers to a battery that charges the storage battery.

[0017] Optionally, the correcting the target charging voltage based on the target charging voltage and the historical charging voltage includes:

[0018] When the target charging voltage is greater than the historical charging voltage, and the voltage difference between the target charging voltage and the historical charging voltage is greater than a first voltage adjustment threshold, the target charging voltage is corrected to the sum of the historical charging voltage and the first voltage adjustment threshold, and the first voltage adjustment threshold is less than or equal to the maximum jump threshold;

[0019] When the target charging voltage is less than the historical charging voltage and the voltage difference between the historical charging voltage and the target charging voltage is greater than a second voltage adjustment threshold, the target charging voltage is corrected to the difference between the historical charging voltage and the first voltage adjustment threshold, and the second voltage adjustment threshold is less than or equal to the maximum jump threshold.

[0020] Optionally, the method further comprises:

[0021] Acquiring the current battery temperature during the battery charging process;

[0022] Determining a charging voltage upper limit and a charging voltage lower limit corresponding to the battery based on the current SOC of the battery and the current battery temperature;

[0023] Based on the charging voltage upper limit and the charging voltage lower limit, correcting the theoretical charging voltage so that the corrected theoretical charging voltage is greater than the charging voltage lower limit and less than the charging voltage upper limit;

[0024] The step of determining the theoretical charging voltage as the target charging voltage includes:

[0025] The corrected theoretical charging voltage is determined as the target charging voltage.

[0026] Optionally, the method further comprises:

[0027] Obtaining an actual charging voltage of the battery;

[0028] When the difference between the actual charging voltage and the corrected target charging voltage is greater than a charging fault threshold, charging the battery is stopped and an alarm message is sent.

[0029] In another aspect, a charging control device is provided, the device comprising:

[0030] A parameter acquisition module is used to obtain the current state of charge SOC during the battery charging process;

[0031] A voltage determination module, used to determine a target charging voltage corresponding to the battery based on the current SOC;

[0032] a voltage correction module, configured to correct the target charging voltage based on the target charging voltage and the historical charging voltage, so that the difference between the corrected target charging voltage and the historical charging voltage is less than or equal to a maximum jump threshold, wherein the historical charging voltage is the charging voltage of the battery at the last moment during the current charging process, and the maximum jump threshold is used to indicate the maximum change amount of the charging voltage adjusted in a single time during the charging process of the battery;

[0033] A charging module is used to charge the battery based on the corrected target charging voltage.

[0034] Optionally, the voltage determination module includes:

[0035] A current determination submodule, used to determine the SOC difference between the current SOC and the target SOC, and determine the target charging current corresponding to the SOC difference, wherein the target SOC refers to the SOC to be achieved by the battery during this charging;

[0036] a current difference determination submodule, used for acquiring a current charging current of the battery and determining a current difference between the current charging current and the target charging current;

[0037] The voltage determination submodule is used to determine a theoretical charging voltage corresponding to the current difference, and determine the theoretical charging voltage as the target charging voltage.

[0038] Optionally, the parameter acquisition module is further used to acquire the current battery temperature during the battery charging process;

[0039] The current determination submodule is further used to determine a target SOC corresponding to the storage battery based on the current battery temperature and the current SOC of the power battery, where the power battery refers to a battery for charging the storage battery.

[0040] Optionally, the voltage correction module is specifically used to:

[0041] When the target charging voltage is greater than the historical charging voltage, and the voltage difference between the target charging voltage and the historical charging voltage is greater than a first voltage adjustment threshold, the target charging voltage is corrected to the sum of the historical charging voltage and the first voltage adjustment threshold, and the first voltage adjustment threshold is less than or equal to the maximum jump threshold;

[0042] When the target charging voltage is less than the historical charging voltage and the voltage difference between the historical charging voltage and the target charging voltage is greater than a second voltage adjustment threshold, the target charging voltage is corrected to the difference between the historical charging voltage and the first voltage adjustment threshold, and the second voltage adjustment threshold is less than or equal to the maximum jump threshold.

[0043] Optionally, the parameter acquisition module is further used to acquire the current battery temperature during the battery charging process;

[0044] The voltage determination submodule is further used to determine the charging voltage upper limit and the charging voltage lower limit corresponding to the battery based on the current SOC of the battery and the current battery temperature; based on the charging voltage upper limit and the charging voltage lower limit, correct the theoretical charging voltage so that the corrected theoretical charging voltage is greater than the charging voltage lower limit and less than the charging voltage upper limit; and determine the corrected theoretical charging voltage as the target charging voltage.

[0045] Optionally, the parameter acquisition module is further used to obtain the actual charging voltage of the battery;

[0046] The charging module is further configured to stop charging the battery and send an alarm message when the difference between the actual charging voltage and the corrected target charging voltage is greater than a charging fault threshold.

[0047] On the other hand, a vehicle is provided, comprising a memory and a controller, wherein the memory is used to store a computer program, and the controller is used to execute the computer program stored in the memory to implement the steps of the charging control method described above.

[0048] On the other hand, a non-transitory computer-readable storage medium is provided, wherein a computer program is stored in the storage medium, and when the computer program is executed by a controller, the steps of the charging control method described above are implemented.

[0049] On the other hand, a computer program product comprising instructions is provided. When the instructions are executed on a computer, the computer executes the steps of the charging control method described above.

[0050] The technical solution provided by this application can at least bring the following beneficial effects:

[0051] Considering that the charging voltage of the battery fluctuates greatly, it will affect the structural stability of the battery, and thus affect the safety of the battery. Therefore, the present application determines the target charging voltage corresponding to the current SOC of the battery and corrects the target charging voltage. Since the difference between the corrected target charging voltage and the historical charging voltage at the previous moment is less than or equal to the maximum jump threshold, during the process of charging the battery at the current moment, the charging voltage of the battery and the historical charging voltage at the previous moment can maintain a small voltage change, prevent the charging voltage of the battery from changing suddenly, and improve the charging stability of the battery. In addition, since the target charging voltage is determined based on the current SOC of the battery, it can also be ensured that the target charging voltage can meet the charging requirements of the battery under different SOC conditions, thereby improving the charging flexibility of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0053] Figure 1 It is a schematic diagram of an implementation environment provided by an embodiment of the present application;

[0054] Figure 2 is a schematic diagram of another implementation environment provided by an embodiment of the present application;

[0055] Figure 3 is a flow chart of a charging control method provided in an embodiment of the present application;

[0056] Figure 4 is a flow chart of another charging control method provided in an embodiment of the present application;

[0057] Figure 5 is a structural schematic diagram of a charging control device provided in an embodiment of the present application;

[0058] Figure 6 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0060] With the rapid development of energy technology, lithium batteries have been widely used in vehicles due to their small size, light weight, high unit energy storage and long service life compared to traditional lead-acid batteries. For example, lithium batteries can be used as vehicle batteries, that is, low-voltage batteries, to provide power for part or all of the vehicle's electrical loads. However, due to the complex operating conditions of batteries, and the fact that the charging effect of lithium batteries is greatly affected by the battery's own power, temperature and other charging parameters, and the change in charging parameters may cause the required charging voltage of the battery to change. If the charging voltage changes greatly, it may accelerate the loss of the battery life, reduce the structural stability of the battery, and lead to safety hazards in the vehicle's power consumption. Therefore, the current charging stability of batteries is poor.

[0061] Based on this, an embodiment of the present application provides a charging control method that can improve the charging stability of a battery.

[0062] Before explaining in detail the charging control method provided in the embodiment of the present application, the implementation environment involved in the embodiment of the present application is first introduced.

[0063] Please refer to Figure 1 , Figure 1 1 is a schematic diagram showing 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. Generally, in electric vehicles and hybrid vehicles, the power battery 101 is also used to provide power energy for the vehicle.

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

[0066] The controller 102 is used to adjust the output voltage of the power battery 101. For example, the controller 102 can determine the voltage required for charging the battery 103 based on the state parameters of the battery 103 collected by the battery management system 104, and then adjust the output voltage of the power battery 101 so that the voltage output by the power battery 101 can meet the charging requirements of the battery 103.

[0067] The storage battery 103 is used to provide electrical energy. For example, the storage battery 103 may be connected to a plurality of electrical loads to provide electrical energy to the plurality of electrical loads.

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

[0069] Optionally, the battery management system 103 can be a vehicle's LBMS (Low Voltage Battery Management System), which is used to detect and monitor parameters such as voltage, current, temperature, SOC (State of Charge), and SOH (State of Health) of the battery 103.

[0070] Those skilled in the art should understand that the above-mentioned power battery 101, controller 102, storage battery 103 and battery management system 104 are only examples, and other existing or future power batteries, controllers, storage batteries and battery management systems, if applicable to the embodiments of the present application, should also be included in the protection scope of the embodiments of the present application and are included here by reference.

[0071] Please refer to Figure 2 , Figure 2 2 is a schematic diagram of another implementation environment according to an exemplary embodiment. The implementation environment includes a storage battery 201 , a LBMS 202 , a ZCU 203 , a VCU 204 , a HBMS 205 and a power battery 206 .

[0072] The storage battery 201 is used to provide electrical energy for part or all of the loads of the vehicle.

[0073] LBMS202, namely LBMS (Low Voltage Battery Management System), is used to detect and monitor parameters such as voltage, current, temperature, SOC, and SOH of the battery 202.

[0074] ZCU 203 , namely ZCU (Zone Control Unit), is used to determine the target charging voltage required by the battery 201 based on the SOC of the battery 201 , and adjust the charging voltage of the battery to the target charging voltage through VCU 204 .

[0075] For example, the ZCU 203 may determine a target charging voltage based on the SOC of the battery 201 , and then send a control signal to the VCU 204 , so as to adjust the charging voltage of the battery 201 to the target charging voltage by controlling the VCU 204 .

[0076] VCU204, namely VCU (Vehicle Control Unit), is used to control the opening and closing of the power battery 206 and adjust the charging voltage of the battery 201 in response to the control instructions of the ZCU203.

[0077] For example, VCU204 can control the power battery 206 to turn on when receiving a first control signal sent by the ZCU to indicate the start of charging the battery 201; and control the power battery 206 to turn off when receiving a second control signal sent by the ZCU to indicate the end of charging the battery 201.

[0078] In some embodiments, combined with the above, the voltage output by the power battery 206 is usually high, and the storage battery 201 cannot be directly charged based on the high voltage output by the power battery 206. Figure 2 As shown, a DCDC converter may be connected between the power battery 206 and the storage battery 201 to convert the high-voltage direct current output by the power battery 206 into low-voltage direct current, thereby charging the storage battery 201 .

[0079] In this scenario, the VCU 204 is further configured to receive a voltage adjustment instruction sent by the ZCU 203 , and adjust the output voltage of the DCDC converter based on the voltage adjustment instruction, thereby adjusting the charging voltage output to the battery 201 .

[0080] Optionally, in some scenarios, such as in hybrid vehicles, the VCU can also be replaced by an HCU (Hybrid Control Unit). In this way, the charging voltage output to the battery can be adjusted by the HCU. The control logic of the HCU is similar to that of the VCU and will not be described here.

[0081] HBMS205, namely HBMS (High Voltage Battery Management System), is used to detect and monitor parameters such as voltage, current, temperature, SOC, and SOH of the power battery 206.

[0082] The power battery 206 is used to charge the storage battery 201. Generally, in electric vehicles and hybrid vehicles, the power battery 206 is also used to provide power energy for the vehicle.

[0083] In some embodiments, Figure 2 As shown, the ZCU 203 may also be connected to a gateway, so that in the event of a charging failure of the battery 201 , an alarm message may be generated and displayed through the gateway.

[0084] Alternatively, if Figure 2 As shown, the gateway can be connected to the vehicle's head unit and the Internet of Vehicles communication module. ZCU203 can forward the alarm information to the head unit based on the gateway, so that the alarm information can be displayed through the head unit; and ZCU203 can forward the alarm information to the Internet of Vehicles communication module based on the gateway, so that the alarm information can be uploaded to the cloud through the Internet of Vehicles communication module.

[0085] Among them, the Internet of Vehicles communication module can be the vehicle's T-Box (Telematics Box, remote information processor), which is used to realize information interaction between the vehicle and the outside world.

[0086] Those skilled in the art should understand that the above-mentioned battery 201, LBMS202, ZCU203, VCU204, HBMS205 and power battery 206 are only examples, and other existing or future batteries, LBMS, ZCU, VCU, HBMS and power batteries, if applicable to the embodiments of the present application, should also be included in the protection scope of the embodiments of the present application and are included here by reference.

[0087] The execution subject of the charging control method provided in the embodiment of the present application is the above-mentioned controller 102 or ZCU204. The controller 102 and ZCU204 can be a general-purpose CPU (Central Processing Unit), NP (Network Processor), microprocessor, or one or more integrated circuits for implementing the scheme of the present application, for example, ASIC (Application-Specific Integrated Circuit), PLD (Programmable Logic Device) or a combination thereof. The above-mentioned PLD can be CPLD (Complex Programmable Logic Device), FPGA (Field-Programmable Gate Array), GAL (Generic Array Logic) or any combination thereof.

[0088] It should be noted that the implementation environment described in the embodiments of the present application is for more clearly illustrating the technical solutions of the embodiments of the present application, and does not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person of ordinary skill in the art can know that with the evolution of the implementation environment, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0089] Next, the charging control method provided in the embodiment of the present application is explained in detail.

[0090] Figure 3 is a flow chart of a charging control method provided in an embodiment of the present application, which is applied to the controller 102 or ZCU204 mentioned above. Figure 3 , the method comprises the following steps.

[0091] Step 301: Obtain the current SOC of the battery during charging.

[0092] It should be noted that since this application is mainly used to realize the charging control of the battery, that is, step 201 will be executed only when the battery needs to be charged. Based on this, in some scenarios, the SOC and / or discharge voltage of the battery can be periodically obtained; when the SOC of the battery is less than the SOC threshold and / or the discharge voltage of the battery is less than the voltage threshold, it is considered that the battery is currently insufficient and needs to be charged, and step 201 is executed.

[0093] Among them, SOC is the state of charge of the battery, which is used to indicate the percentage of the remaining battery power to the rated capacity of the battery, that is, the current remaining capacity of the battery.

[0094] Step 302: Based on the current SOC, determine the target charging voltage corresponding to the battery.

[0095] In some embodiments, the controller may periodically obtain the current SOC of the battery, and then determine the target charging voltage corresponding to the battery based on the current SOC to implement charging control of the battery.

[0096] For example, the controller may obtain the current SOC of the battery every 10 milliseconds (ms), and then determine the target charging voltage corresponding to the battery based on the current SOC of the battery, thereby achieving real-time adjustment of the charging voltage of the battery.

[0097] In some embodiments, the SOC difference between the current SOC and the target SOC can be determined, and the target charging current corresponding to the SOC difference can be determined, where the target SOC refers to the SOC that the battery is to reach during this charging; the current charging current of the battery is obtained, and the current difference between the current charging current and the target charging current is determined; the theoretical charging voltage corresponding to the current difference is determined, and the theoretical charging voltage is determined as the target charging voltage.

[0098] In some embodiments, the target charging current corresponding to the SOC difference can be determined based on a first mapping relationship, and the first mapping relationship is used to indicate the mapping relationship between the SOC difference and the charging current. Based on a second mapping relationship, the theoretical charging voltage corresponding to the current difference is determined, and the second mapping relationship is used to indicate the mapping relationship between the current difference and the theoretical charging voltage. The first mapping relationship and the second mapping relationship can be based on a mapping relationship function or a mapping relationship table determined based on experimental statistical data and expert experience, and can be flexibly selected based on actual usage requirements, and the embodiments of the present application do not limit this.

[0099] In other embodiments, Figure 4 As shown, the target charging current corresponding to the SOC difference between the current SOC and the target SOC can also be determined based on the current SOC and the target SOC through a proportional, integral and differential control algorithm; further, based on the current charging current and the target charging current, the theoretical charging voltage corresponding to the current difference between the current charging current and the target charging current can be determined through a proportional, integral and differential control algorithm.

[0100] It should be noted that proportional, integral and differential control, namely PID control, P refers to proportional control, I refers to integral control, and D refers to differential control. The specific control algorithm can be determined in combination with actual usage requirements. For example, based on different control requirements, the target charging current and theoretical charging voltage can be determined by PI algorithm, PD algorithm, PID algorithm, etc.

[0101] Since the logics of determining the target charging current and the theoretical voltage by various PID control algorithms are basically the same, only the PID algorithm for determining the target charging current is used as an example for explanation here.

[0102] In the PID algorithm, there are proportional branches, integral branches and micro branches. The proportional branch is used to determine the proportional correction parameter corresponding to the SOC difference, the integral branch is used to determine the integral correction parameter corresponding to the SOC difference, and the micro branch is used to determine the differential correction parameter corresponding to the SOC difference, and then the target charging current corresponding to the SOC difference is determined based on the proportional correction parameter, the integral correction parameter and the differential correction parameter. For example, the sum of the proportional correction parameter, the integral correction parameter, the differential correction parameter and the historical voltage can be determined as the target charging current corresponding to the SOC difference.

[0103] In some embodiments, the current battery temperature during the battery charging process may be acquired; based on the current battery temperature and the current SOC of the power battery, the target SOC corresponding to the battery is determined, where the power battery refers to the battery used to charge the battery.

[0104] Optionally, in Figure 2 In the scenario shown, the ZCU can obtain the current battery temperature of the battery based on the LBMS, the VCU can obtain the current SOC of the power battery through the HBMS, and send the current SOC of the power battery to the ZCU, so that the ZCU can determine the target SOC corresponding to the battery based on the current battery temperature of the battery and the current SOC of the power battery.

[0105] In some embodiments, based on the current battery temperature of the battery and the SOC of the power battery, the target SOC corresponding to the battery is determined through a third mapping relationship, and the third mapping relationship is used to indicate the mapping relationship between the battery temperature, the power battery SOC, and the target SOC. The third mapping relationship can be a mapping relationship function or a mapping relationship table determined based on experimental statistical data and expert experience, and can be flexibly selected based on actual use requirements, and the embodiments of the present application do not limit this.

[0106] It should be noted that the target SOC that the battery can achieve will also be different when the battery temperature is different. For example, when the battery temperature is high, in order to reduce the thermal stress of the battery and prevent the battery from overheating, the target SOC of the battery can be lowered compared to a normal temperature battery.

[0107] In addition, since the power battery is used to charge the storage battery, the target SOC that the storage battery can achieve will also be different when the SOC of the power battery is different. For example, if the SOC of the power battery is low, it means that the power battery can provide less electrical energy. At this time, considering that as the SOC of the power battery decreases, the charging voltage and maximum charging current that the power battery can provide will also decrease, thereby affecting the charging efficiency of the storage battery. Based on this, when the SOC of the power battery is low, in order to ensure the charging efficiency of the storage battery, the target SOC of the storage battery can be lowered.

[0108] In some embodiments, the current battery temperature during the battery charging process can be obtained; based on the current SOC of the battery and the current battery temperature, the upper and lower limits of the charging voltage corresponding to the battery are determined; based on the upper and lower limits of the charging voltage, the theoretical charging voltage is corrected so that the corrected theoretical charging voltage is greater than the lower limit of the charging voltage and less than the upper limit of the charging voltage; the corrected theoretical charging voltage is determined as the target charging voltage.

[0109] It should be noted that, considering that the charging voltage that the battery can withstand under different conditions (such as different SOCs or different battery temperatures) may vary, after determining the theoretical voltage of the battery, the theoretical voltage can be corrected based on the actual state of the battery.

[0110] In some embodiments, the mapping relationship between the battery SOC, battery temperature, and the upper and lower limits of the charging voltage can be determined based on experimental statistical data, and then the upper and lower limits of the charging voltage corresponding to the current SOC of the battery and the current battery temperature can be determined based on the mapping relationship.

[0111] For example, a mapping relationship A between SOC, the upper limit of charging voltage, and the lower limit of charging voltage, and a mapping relationship B between battery temperature, the upper limit of charging voltage, and the lower limit of charging voltage may be determined. Then, based on the current SOC of the battery and the mapping relationship A, the first upper limit of charging voltage and the first lower limit of charging voltage corresponding to the battery are determined; based on the current battery temperature of the battery and the mapping relationship B, the second upper limit of charging voltage and the second lower limit of charging voltage corresponding to the battery are determined; based on the first upper limit of charging voltage, the first lower limit of charging voltage, the second upper limit of charging voltage, and the second lower limit of charging voltage, the upper limit of charging voltage and the lower limit of charging voltage corresponding to the battery are determined.

[0112] Among them, the method for determining the upper and lower limits of the charging voltage corresponding to the battery based on the first upper limit of the charging voltage, the first lower limit of the charging voltage, the second upper limit of the charging voltage, and the second lower limit of the charging voltage can be flexibly selected based on actual use requirements. For example, the minimum value of the first upper limit of the charging voltage and the second upper limit of the charging voltage can be determined as the upper limit of the charging voltage corresponding to the battery, and the maximum value of the first lower limit of the charging voltage and the second lower limit of the charging voltage can be determined as the lower limit of the charging voltage corresponding to the battery.

[0113] In some embodiments, if the theoretical charging voltage is greater than or equal to the upper limit of the charging voltage corresponding to the battery, it means that the currently determined theoretical charging voltage is too large, and the theoretical charging voltage is corrected to the upper limit of the charging voltage corresponding to the battery; if the theoretical charging voltage is less than or equal to the lower limit of the charging voltage corresponding to the battery, it means that the currently determined theoretical charging voltage is too small, and the theoretical charging voltage is corrected to the lower limit of the charging voltage corresponding to the battery.

[0114] Step 303: Based on the target charging voltage and the historical charging voltage, correct the target charging voltage so that the difference between the corrected target charging voltage and the historical charging voltage is less than or equal to the maximum jump threshold value, the historical charging voltage is the charging voltage of the battery at the last moment during this charging process, and the maximum jump threshold value is used to indicate the maximum change in the charging voltage during a single adjustment of the battery charging process.

[0115] Optionally, the maximum transition threshold may be determined based on actual usage requirements, such as based on experimental statistical data. For example, the maximum transition threshold may be 0.2 V (volts).

[0116] In some embodiments, the maximum jump threshold may also be a voltage change threshold per unit time, that is, a change threshold of the charging voltage per unit time during the battery charging process, such as 0.2 V / S (volts per second).

[0117] Combined with the above example, if the controller determines the target charging voltage of the battery every 10ms, the historical charging voltage is the target charging voltage determined last time, that is, 10ms ago. At this time, the voltage difference between the target charging voltage and the historical charging voltage can be determined based on the target charging voltage and the historical charging voltage, and the target charging voltage can be corrected through different judgment methods based on the type of the maximum jump threshold.

[0118] For example, if the maximum jump threshold is a voltage difference threshold, such as the unit of the maximum jump threshold is 0.2V, the target charging voltage can be corrected directly according to the magnitude relationship between the voltage difference and the maximum jump threshold.

[0119] As another example, if the maximum jump threshold is the voltage unit time change threshold, such as the maximum jump threshold is 0.2V / S, then based on the voltage difference between the target charging voltage and the historical charging voltage, and the interval between the target charging voltage and the historical charging voltage, the voltage unit change difference between the target charging voltage and the historical charging voltage is determined, and the target charging voltage is corrected through the relationship between the voltage unit change difference and the maximum jump threshold.

[0120] Since the correction principle of the maximum jump threshold being the voltage difference threshold is similar to the correction principle of the maximum jump threshold being the voltage unit time change threshold, the correction principle is described below by taking the maximum jump threshold being the voltage difference threshold as an example.

[0121] In some embodiments, when the target charging voltage is greater than the historical charging voltage and the voltage difference between the target charging voltage and the historical charging voltage is greater than the first voltage adjustment threshold, the target charging voltage is corrected to the sum of the historical charging voltage and the first voltage adjustment threshold, and the first voltage adjustment threshold is less than or equal to the maximum jump threshold; when the target charging voltage is less than the historical charging voltage and the voltage difference between the historical charging voltage and the target charging voltage is greater than the second voltage adjustment threshold, the target charging voltage is corrected to the difference between the historical charging voltage and the first voltage adjustment threshold, and the second voltage adjustment threshold is less than or equal to the maximum jump threshold.

[0122] It should be noted that in a single adjustment of the charging voltage, the first voltage adjustment threshold is the maximum voltage that the voltage after this adjustment can increase compared to the historical charging voltage, and the second voltage adjustment threshold is the maximum voltage that the voltage after this adjustment can decrease compared to the historical charging voltage. The first voltage adjustment threshold and the second voltage adjustment threshold can be the same value or different values, and can be flexibly adjusted based on usage requirements. For example, the first voltage adjustment threshold and the second voltage adjustment threshold can both be 0.2V; for another example, the first voltage adjustment threshold can be 0.2V, and the second voltage adjustment threshold can be 0.3V.

[0123] It should also be noted that, when the target charging voltage is greater than the historical charging voltage, it indicates that the current charging voltage of the battery needs to be increased. If the voltage difference between the target charging voltage and the historical charging voltage is greater than the first voltage adjustment threshold, it indicates that the increase in the target charging voltage compared to the historical charging voltage is large, so the target charging voltage needs to be lowered. Moreover, since the maximum value to which the current charging voltage can rise is the sum of the historical charging voltage and the first voltage adjustment threshold, the target charging voltage can be corrected to the sum.

[0124] Similarly, when the target charging voltage is less than the historical charging voltage, it indicates that the current charging voltage of the battery needs to be reduced. If the difference between the historical charging voltage and the target charging voltage is greater than the second voltage adjustment threshold, it indicates that the target charging voltage is reduced by a large amount compared to the historical charging voltage, so the target charging voltage needs to be increased. Moreover, since the minimum value to which the current charging voltage can be reduced is the difference between the historical charging voltage and the second voltage adjustment threshold, the target charging voltage can be corrected to the difference.

[0125] For example, the target charging voltage is 13.5V, and the historical charging voltage is 13V. If the first voltage adjustment threshold is 0.2V, since the difference between the target charging voltage and the historical charging voltage is 0.5V, which is greater than the first voltage adjustment threshold, the target charging voltage needs to be corrected to the sum of the historical charging voltage and the first voltage adjustment threshold, that is, 13.2V. For another example, the target charging voltage is 12V, and the historical charging voltage is 13.2V. If the second voltage adjustment threshold is 0.3V, since the voltage difference between the historical charging voltage and the target charging voltage is 1.2V, which is greater than the second voltage adjustment threshold, the target charging voltage needs to be corrected to the difference between the historical charging voltage and the first voltage adjustment threshold, that is, 12.9V.

[0126] It should be noted that if the target charging voltage is greater than the historical charging voltage, and the voltage difference between the target charging voltage and the historical charging voltage is less than or equal to the first voltage adjustment threshold, it indicates that the increase in the target charging voltage compared to the historical charging voltage is small, and the target charging voltage may not be corrected.

[0127] Similarly, if the target charging voltage is lower than the historical charging voltage, and the voltage difference between the historical charging voltage and the target charging voltage is lower than or equal to the second voltage adjustment threshold, it indicates that the target charging voltage is less reduced than the historical charging voltage, and the target charging voltage may not be corrected at this time.

[0128] In addition, if the target charging voltage is equal to the historical charging voltage, it indicates that the charging voltage of the battery does not need to be adjusted, and the target charging voltage does not need to be corrected, and the battery is charged directly based on the target charging voltage.

[0129] Step 304: Charge the battery based on the corrected target charging voltage.

[0130] Optionally, if the electric energy required for charging the battery is provided by the power battery of the vehicle, the voltage output by the power battery can be adjusted to the corrected target charging voltage to charge the battery based on the corrected target charging voltage. For example, the low voltage direct current converted by the DCDC converter can be adjusted so that the voltage after the DCDC conversion is the corrected target charging voltage.

[0131] For example, in Figure 2 In the scenario shown, the ZCU may send the corrected target charging voltage to the VCU, and the VCU adjusts the output voltage of the DCDC converter to the corrected target charging voltage, thereby charging the battery based on the corrected target charging voltage.

[0132] In some embodiments, the actual charging voltage of the battery may be obtained; when the difference between the actual charging voltage and the corrected target charging voltage is greater than a charging fault threshold, charging of the battery is stopped and an alarm message is sent.

[0133] The charging fault threshold can be flexibly determined in combination with actual usage requirements. For example, the charging fault threshold can be 1V.

[0134] It should be noted that if the difference between the actual charging voltage and the corrected target charging voltage is greater than the charging fault threshold, it indicates that there is a large deviation between the voltage output by the power battery (or the voltage converted by the DCDC converter) and the actual charging voltage of the battery. At this time, it can be considered that the battery has a charging fault. In order to avoid safety hazards in the battery charging process caused by abnormal charging, the battery charging can be stopped immediately, and an alarm message can be generated and sent to ensure the safety of the battery charging process.

[0135] Still Figure 2 Taking the scenario shown as an example, during the process of charging the battery, LBMS can send the actual charging voltage received by the battery to ZCU in real time. ZCU compares the actual charging voltage with the corrected target charging voltage output by itself to VCU. If the difference between the actual charging voltage and the corrected target charging voltage is greater than the charging fault threshold, the current charging fault of the battery is determined, and a battery charging fault instruction is sent to the audio host and the Internet of Vehicles communication module respectively through the gateway. The audio host displays the battery charging fault on the host screen, and the Internet of Vehicles communication module uploads the battery charging fault instruction to the cloud, so that vehicle users, vehicle maintenance personnel and other relevant personnel can check the historical records of battery charging faults at any time to improve vehicle maintenance efficiency.

[0136] In the embodiment of the present application, by obtaining the current SOC of the battery during charging and determining the target SOC of the battery during charging, the target charging voltage of the battery is adjusted in real time based on the current SOC and the target SOC of the battery to improve the charging efficiency of the battery during charging. Moreover, after determining the target charging voltage, the target charging voltage is corrected based on the historical charging voltage so that the difference between the corrected target charging voltage and the historical charging voltage is within the allowable range, thereby improving the charging efficiency of the battery while avoiding damage to the battery due to sudden changes in the charging voltage, and improving the charging stability of the battery.

[0137] When determining the target charging voltage corresponding to the battery, the target charging current required for the battery to reach the target SOC is first determined by the SOC difference between the current SOC of the battery and the target SOC, and then the target charging voltage required for the battery to reach the target charging current is determined based on the current difference between the target charging current and the actual charging current. In this way, since the charging current is a parameter that directly affects the charging efficiency and service life of the battery, it is possible to ensure that the target charging voltage is the charging voltage corresponding to the charging current actually required for charging the battery, so as to improve the accuracy of the determined target charging voltage, thereby improving the charging efficiency of the battery.

[0138] In addition, since the battery's power carrying capacity varies at different battery temperatures, and the actual power supply capacity of the power battery at different SOCs also varies, when determining the target SOC of the battery, the battery temperature and the current SOC of the power battery can be combined to determine the target SOC that the battery needs to reach, that is, the impact of the battery's power carrying capacity at the battery temperature on the target SOC, and the impact of the actual power supply capacity of the power battery at the SOC on the target SOC are considered, so as to ensure the charging safety of the battery and the power supply efficiency of the power battery during the battery charging process, and improve the flexibility of determining the target SOC.

[0139] In addition, the actual charging voltage of the battery is also obtained, and based on the target charging voltage output by the power battery and the actual charging voltage of the battery, it is determined whether there is an abnormal fault in the battery charging process. In this way, if there is a charging fault in the battery, the charging of the battery is terminated in time and an alarm message is sent to improve the safety of the battery charging process.

[0140] Figure 5 This is a schematic diagram of the structure of a charging control device provided in an embodiment of the present application. Please refer to Figure 5 The device includes: a parameter acquisition module 501, a voltage determination module 502, a voltage correction module 503 and a charging module 504.

[0141] The parameter acquisition module 501 is used to obtain the current state of charge SOC during the battery charging process;

[0142] A voltage determination module 502 is used to determine a target charging voltage corresponding to the battery based on the current SOC;

[0143] The voltage correction module 503 is used to correct the target charging voltage based on the target charging voltage and the historical charging voltage so that the difference between the corrected target charging voltage and the historical charging voltage is less than or equal to the maximum jump threshold value, the historical charging voltage is the charging voltage of the battery at the last moment in the current charging process, and the maximum jump threshold value is used to indicate the maximum change amount of the charging voltage in a single adjustment during the charging process of the battery;

[0144] The charging module 504 is configured to charge the battery based on the corrected target charging voltage.

[0145] Optionally, the voltage determination module 502 includes:

[0146] The charging current determination submodule is used to determine the SOC difference between the current SOC and the target SOC, and determine the target charging current corresponding to the SOC difference. The target SOC refers to the SOC that the battery is to achieve during this charging.

[0147] A current difference determination submodule, used to obtain a current charging current of the battery and determine a current difference between the current charging current and a target charging current;

[0148] The target charging voltage determination submodule is used to determine a theoretical charging voltage corresponding to the current difference, and determine the theoretical charging voltage as a target charging voltage.

[0149] Optionally, the parameter acquisition module 501 is further used to acquire the current battery temperature during the battery charging process;

[0150] The voltage determination module 502 is further configured to determine a target SOC corresponding to the storage battery based on the current battery temperature and the current SOC of the power battery, where the power battery refers to a battery for charging the storage battery.

[0151] Optionally, the voltage correction module 503 is specifically used to:

[0152] When the target charging voltage is greater than the historical charging voltage, and the voltage difference between the target charging voltage and the historical charging voltage is greater than the first voltage adjustment threshold, the target charging voltage is corrected to the sum of the historical charging voltage and the first voltage adjustment threshold, and the first voltage adjustment threshold is less than or equal to the maximum jump threshold;

[0153] When the target charging voltage is lower than the historical charging voltage and the voltage difference between the historical charging voltage and the target charging voltage is greater than the second voltage adjustment threshold, the target charging voltage is corrected to the difference between the historical charging voltage and the first voltage adjustment threshold, and the second voltage adjustment threshold is lower than or equal to the maximum jump threshold.

[0154] Optionally, the parameter acquisition module 501 is further used to acquire the current battery temperature during the battery charging process;

[0155] The voltage determination submodule is also used to determine the upper and lower limits of the charging voltage corresponding to the battery based on the current SOC of the battery and the current battery temperature; based on the upper and lower limits of the charging voltage, correct the theoretical charging voltage so that the corrected theoretical charging voltage is greater than the lower limit of the charging voltage and less than the upper limit of the charging voltage; and determine the corrected theoretical charging voltage as the target charging voltage.

[0156] Optionally, the parameter acquisition module 501 is further used to obtain the actual charging voltage of the battery;

[0157] The charging module 504 is further configured to stop charging the battery and send an alarm message when the difference between the actual charging voltage and the corrected target charging voltage is greater than a charging fault threshold.

[0158] In the embodiment of the present application, by obtaining the current SOC of the battery during charging and determining the target SOC of the battery during charging, the target charging voltage of the battery is adjusted in real time based on the current SOC and the target SOC of the battery to improve the charging efficiency of the battery during charging. Moreover, after determining the target charging voltage, the target charging voltage is corrected based on the historical charging voltage so that the difference between the corrected target charging voltage and the historical charging voltage is within the allowable range, thereby improving the charging efficiency of the battery while avoiding damage to the battery due to sudden changes in the charging voltage, and improving the charging stability of the battery.

[0159] When determining the target charging voltage corresponding to the battery, the target charging current required for the battery to reach the target SOC is first determined by the SOC difference between the current SOC of the battery and the target SOC, and then the target charging voltage required for the battery to reach the target charging current is determined based on the current difference between the target charging current and the actual charging current. In this way, since the charging current is a parameter that directly affects the charging efficiency and service life of the battery, it is possible to ensure that the target charging voltage is the charging voltage corresponding to the charging current actually required for charging the battery, so as to improve the accuracy of the determined target charging voltage, thereby improving the charging efficiency of the battery.

[0160] In addition, since the battery's power carrying capacity varies at different battery temperatures, and the actual power supply capacity of the power battery at different SOCs also varies, when determining the target SOC of the battery, the battery temperature and the current SOC of the power battery can be combined to determine the target SOC that the battery needs to reach, that is, the impact of the battery's power carrying capacity at the battery temperature on the target SOC, and the impact of the actual power supply capacity of the power battery at the SOC on the target SOC are considered, so as to ensure the charging safety of the battery and the power supply efficiency of the power battery during the battery charging process, and improve the flexibility of determining the target SOC.

[0161] In addition, the actual charging voltage of the battery is also obtained, and based on the target charging voltage output by the power battery and the actual charging voltage of the battery, it is determined whether there is an abnormal fault in the battery charging process. In this way, if there is a charging fault in the battery, the charging of the battery is terminated in time and an alarm message is sent to improve the safety of the battery charging process.

[0162] It should be noted that: the charging control device provided in the above embodiment only uses the division of the above functional modules as an example to illustrate when realizing the charging of the battery. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the charging control device provided in the above embodiment and the charging control method embodiment belong to the same concept, and the specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0163] Figure 6 6 is a structural block diagram of a vehicle 600 provided in an embodiment of the present application. Generally, the vehicle 600 includes: a controller 601 and a memory 602 .

[0164] The controller 601 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The controller 601 may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field Programmable Gate Array), and PLA (Programmable Logic Array). The controller 601 may also include a main processor and a coprocessor. The main processor is a processor for processing data in an awake state, also known as a CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the controller 601 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the controller 601 may also include an AI (Artificial Intelligence) processor, which is used to process computing operations related to machine learning.

[0165] The memory 602 may include one or more non-temporary computer-readable storage media. The memory 602 may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In some embodiments, the non-temporary computer-readable storage medium in the memory 602 is used to store at least one instruction, which is used to be executed by the controller 601 to implement the charging control method provided in the method embodiment of the present application.

[0166] In some embodiments, a non-transitory computer-readable storage medium is also provided, in which a computer program is stored, and when the computer program is executed by the controller, the steps of the charging control method in the above embodiment are implemented. For example, the non-transitory computer-readable storage medium can be a ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.

[0167] It should be understood that all or part of the steps for implementing the above embodiments may be implemented by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The computer instructions may be stored in the above non-temporary computer-readable storage medium.

[0168] That is, in some embodiments, a computer program product including instructions is also provided, which, when executed on a computer, enables the computer to execute the steps of the charging control method described above.

[0169] It should be understood that the "at least one" mentioned herein refers to one or more, and "multiple" refers to two or more. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second" and the like are used to distinguish the same items or similar items with basically the same functions and effects. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not limit them to be necessarily different.

[0170] 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, stored data, displayed data, etc.) and signals involved in the embodiments of the present application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data need to comply with relevant laws, regulations and standards of relevant countries and regions.

[0171] The above-mentioned embodiments are provided for the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A charging control method, characterized in that: The method comprises: Get the current state of charge SOC during battery charging; Based on the current SOC, determining a target charging voltage corresponding to the battery; Based on the target charging voltage and the historical charging voltage, the target charging voltage is corrected so that the difference between the corrected target charging voltage and the historical charging voltage is less than or equal to a maximum jump threshold, wherein the historical charging voltage is the charging voltage of the battery at the last moment during the current charging process, and the maximum jump threshold is used to indicate the maximum change amount of a single adjustment of the charging voltage during the charging process of the battery; The battery is charged based on the corrected target charging voltage.

2. The method according to claim 1, characterized in that The determining, based on the current SOC, a target charging voltage corresponding to the battery includes: Determine the SOC difference between the current SOC and the target SOC, and determine the target charging current corresponding to the SOC difference, wherein the target SOC refers to the SOC to be achieved by the battery during this charging; Acquiring a current charging current of the battery, and determining a current difference between the current charging current and the target charging current; A theoretical charging voltage corresponding to the current difference is determined, and the theoretical charging voltage is determined as the target charging voltage.

3. The method according to claim 2, characterized in that The method further comprises: Acquiring the current battery temperature during the battery charging process; Based on the current battery temperature and the current SOC of the power battery, a target SOC corresponding to the storage battery is determined, where the power battery refers to a battery that charges the storage battery.

4. The method according to claim 1 or 2, characterized in that: The modifying the target charging voltage based on the target charging voltage and the historical charging voltage includes: When the target charging voltage is greater than the historical charging voltage, and the voltage difference between the target charging voltage and the historical charging voltage is greater than a first voltage adjustment threshold, the target charging voltage is corrected to the sum of the historical charging voltage and the first voltage adjustment threshold, and the first voltage adjustment threshold is less than or equal to the maximum jump threshold; When the target charging voltage is less than the historical charging voltage and the voltage difference between the historical charging voltage and the target charging voltage is greater than a second voltage adjustment threshold, the target charging voltage is corrected to the difference between the historical charging voltage and the first voltage adjustment threshold, and the second voltage adjustment threshold is less than or equal to the maximum jump threshold.

5. The method according to claim 2, characterized in that The method further comprises: Acquiring the current battery temperature during the battery charging process; Determining a charging voltage upper limit and a charging voltage lower limit corresponding to the battery based on the current SOC of the battery and the current battery temperature; Based on the charging voltage upper limit and the charging voltage lower limit, correcting the theoretical charging voltage so that the corrected theoretical charging voltage is greater than the charging voltage lower limit and less than the charging voltage upper limit; The step of determining the theoretical charging voltage as the target charging voltage includes: The corrected theoretical charging voltage is determined as the target charging voltage.

6. The method according to claim 1, characterized in that The method further comprises: Obtaining an actual charging voltage of the battery; When the difference between the actual charging voltage and the corrected target charging voltage is greater than a charging fault threshold, charging the battery is stopped and an alarm message is sent.

7. A charging control device, characterized in that: The device comprises: A parameter acquisition module is used to obtain the current state of charge SOC during the battery charging process; A voltage determination module, used to determine a target charging voltage corresponding to the battery based on the current SOC; a voltage correction module, configured to correct the target charging voltage based on the target charging voltage and the historical charging voltage, so that the difference between the corrected target charging voltage and the historical charging voltage is less than or equal to a maximum jump threshold, wherein the historical charging voltage is the charging voltage of the battery at the last moment during the current charging process, and the maximum jump threshold is used to indicate the maximum change amount of the charging voltage adjusted in a single time during the charging process of the battery; A charging module is used to charge the battery based on the corrected target charging voltage.

8. A vehicle, characterized in that: The computer device includes a memory and a controller, the memory is used to store a computer program, and the controller is used to execute the computer program stored in the memory to implement the steps of the method described in any one of claims 1 to 6.

9. A non-transitory computer-readable storage medium, characterized in that: The storage medium stores a computer program, which, when executed by the controller, implements the steps of the method described in any one of claims 1 to 6.

10. A computer program product comprising instructions, characterized in that When the instructions are executed on a computer, the computer is enabled to execute the steps of the method described in any one of claims 1 to 6.

Images