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

Abstract

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

Description

TECHNICAL FIELD

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

[0002] With the development of vehicle technology, vehicles carry more and more loads, and since the electric energy usually used by vehicle loads is low-voltage electricity, low-voltage batteries, i.e. storage batteries, have been widely used in vehicles. However, due to the special use scenario of vehicles, the storage batteries cannot be charged at any time through an external power supply. Based on this, in order to ensure that the power of the storage battery always remains at a healthy level, the vehicle usually charges the storage battery through the mounted power battery.

[0003] During the charging of the storage battery, as the charging scenario changes, the charging voltage of the storage battery may change, thereby affecting the battery life of the storage battery and causing an impact on the battery structure of the storage battery, and even possibly causing a safety hazard of the vehicle. Therefore, the current charging stability of the storage battery is poor. SUMMARY

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

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

[0006] obtaining a current state of charge (SOC) during charging of a storage battery;

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

[0008] correcting the target charging voltage based on the target charging voltage and a 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, the historical charging voltage being the charging voltage of the storage battery at the previous time in the current charging process, and the maximum jump threshold being used to indicate the maximum variation of the charging voltage of the storage battery in a single adjustment during the charging process;

[0009] charging the storage battery based on the corrected target charging voltage.

[0010] Optionally, the determining of the target charging voltage corresponding to the storage battery based on the current SOC comprises:

[0011] determining a SOC difference between the current SOC and a target SOC, the target SOC being a SOC to be reached by the battery in the current charging process;

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

[0013] determining a theoretical charging voltage corresponding to the current difference, and determining the theoretical charging voltage as the target charging voltage.

[0014] Optionally, the method further comprises:

[0015] obtaining a current battery temperature in the charging process of the battery;

[0016] determining a target SOC corresponding to the battery based on the current battery temperature and a current SOC of a power battery, the power battery being a battery charging the battery.

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

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

[0019] in a case where the target charging voltage is less than the historical charging voltage, and a voltage difference between the historical charging voltage and the target charging voltage is greater than a second voltage adjustment threshold, correcting the target charging voltage to a difference between the historical charging voltage and the first voltage adjustment threshold, the second voltage adjustment threshold being less than or equal to the maximum jump threshold.

[0020] Optionally, the method further comprises:

[0021] obtaining a current battery temperature in the charging process of the battery;

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

[0023] correcting the theoretical charging voltage based on the upper limit of the charging voltage and the lower limit of the 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;

[0024] The theoretical charging voltage is determined as the target charging voltage.

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

[0026] Optionally, the method further comprises:

[0027] An actual charging voltage of the battery is acquired;

[0028] In a case where a 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.

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

[0030] A parameter acquisition module is configured to acquire a current state of charge (SOC) in a charging process of a battery;

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

[0032] A voltage correction module is configured to correct the target charging voltage based on the target charging voltage and a historical charging voltage, so that a difference between the corrected target charging voltage and the historical charging voltage is less than or equal to a maximum jump threshold, the historical charging voltage being a charging voltage of the battery at a previous time in the current charging process, and the maximum jump threshold being used to indicate a maximum variation of a single adjustment of the charging voltage in the charging process of the battery.

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

[0034] Optionally, the voltage determination module comprises:

[0035] A current determination sub-module is configured to determine an SOC difference between the current SOC and a target SOC, and determine a target charging current corresponding to the SOC difference, the target SOC being a SOC to be reached by the battery in the current charging.

[0036] A current difference determination sub-module is configured to acquire a current charging current of the battery, and determine a current difference between the current charging current and the target charging current.

[0037] A voltage determination sub-module is configured 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 obtaining module is further configured to obtain a current battery temperature during the charging of the storage battery.

[0039] The current battery temperature is a temperature of the storage battery during the charging of the storage battery.

[0040] Optionally, the voltage correcting module is specifically configured to:

[0041] In a case where the target charging voltage is greater than the historical charging voltage, and a 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 a sum of the historical charging voltage and the first voltage adjustment threshold, the first voltage adjustment threshold being less than or equal to the maximum jump threshold.

[0042] In a case where the target charging voltage is less than the historical charging voltage, and a 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 a difference between the historical charging voltage and the first voltage adjustment threshold, the second voltage adjustment threshold being less than or equal to the maximum jump threshold.

[0043] Optionally, the parameter obtaining module is further configured to obtain a current battery temperature during the charging of the storage battery.

[0044] The voltage determining sub-module is further configured to determine an upper limit of the charging voltage and a lower limit of the charging voltage of the storage battery based on the current SOC of the storage battery and the current battery temperature, correct the theoretical charging voltage based on the upper limit of the charging voltage and the lower limit of the 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.

[0045] Optionally, the parameter obtaining module is further configured to obtain an actual charging voltage of the storage battery.

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

[0047] In another aspect, a vehicle is provided, the vehicle comprising a memory and a controller, the memory being configured to store a computer program, and the controller being configured to execute the computer program stored in the memory to implement the steps of the charging control method described above.

[0048] In another aspect, a non-transitory computer-readable storage medium is provided, the storage medium having stored therein a computer program which, when executed by a controller, implements the steps of the charging control method described above.

[0049] In another aspect, a computer program product containing instructions which, when executed on a computer, cause the computer to perform the steps of the charging control method described above is provided.

[0050] The technical solutions provided in the present application can bring at least the following beneficial effects:

[0051] Considering that the charging voltage of the storage battery fluctuates greatly, it will affect the structural stability of the storage battery, and further affect the use safety of the storage battery. Therefore, the present application determines the target charging voltage corresponding to the current SOC of the storage battery, and corrects the target charging voltage. Since the difference between the corrected target charging voltage and the historical charging voltage at the last moment is less than or equal to the maximum jump threshold, during the charging process of the storage battery at the current moment, the charging voltage of the storage battery and the historical charging voltage at the last moment can maintain a small voltage change, preventing the charging voltage of the storage battery from changing abruptly, and improving the charging stability of the storage battery. Moreover, since the target charging voltage is determined based on the current SOC of the storage battery, the target charging voltage can also meet the charging demand of the storage battery under different SOC conditions, thereby improving the charging flexibility of the storage battery. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0053] Figure 1 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 flowchart of a charging control method provided by an embodiment of the present application;

[0056] Figure 4 is a flowchart of another charging control method provided by an embodiment of the present application;

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

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

[0059] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

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

[0061] Based on this, the embodiments of the present application provide a charging control method which can improve the charging stability of the storage battery.

[0062] Before the charging control method provided by the embodiments of the present application is explained and described in detail, the implementation environment related to the embodiments of the present application will be introduced.

[0063] Please refer to Figure 1 , Figure 1 is a schematic diagram of 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. Usually, 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, and the current required by the storage battery 103 for charging is a low-voltage current. Based on this, as Figure 1As shown, a DC-DC converter can also be connected between the power battery 101 and the storage battery 103, for adjusting the voltage output by the power battery 101, so as to supply the storage battery 103 with electric energy based on the charging voltage required by the storage battery 103. At this time, the controller 102 can be connected with the DC-DC converter, and by adjusting the voltage output by the DC-DC converter, the charging voltage of the storage battery 103 can be controlled.

[0066] The controller 102 is configured to adjust the output voltage of the power battery 101. For example, the controller 102 can determine the charging voltage required by the storage battery 103 based on the state parameters of the storage 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 storage battery 103.

[0067] The storage battery 103 is configured to supply electric energy. For example, the storage battery 103 can be connected with a plurality of electric loads, so as to supply electric energy to the plurality of electric loads.

[0068] The battery management system 104 is configured to acquire the state parameters of the storage battery 103.

[0069] Optionally, the battery management system 104 can be a low-voltage battery management system of the vehicle, and is configured to detect and monitor the voltage, current, temperature, SOC (State of Charge), SOH (State of Health) and other parameters of the storage battery 103.

[0070] Those skilled in the art should understand that the power battery 101, the controller 102, the storage battery 103 and the battery management system 104 described above are only examples, and other existing or future power batteries, controllers, storage batteries and battery management systems that can be 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 hereby incorporated by reference.

[0071] Please refer to Figure 2 , Figure 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 configured to supply electric energy to part of the loads or all of the loads of the vehicle.

[0073] The LBMS 202, i.e., the Low Voltage Battery Management System, is configured to detect and monitor parameters such as voltage, current, temperature, SOC, SOH, etc. of the battery 201.

[0074] The ZCU 203, i.e., the Zone Control Unit, is configured to determine a 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 the VCU 204.

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

[0076] The VCU 204, i.e., the Vehicle Control Unit, is configured 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 instruction of the ZCU 203.

[0077] For example, the VCU 204 can control the power battery 206 to open when receiving the first control signal sent by the ZCU to indicate that the charging of the battery 201 starts, and control the power battery 206 to close when receiving the second control signal sent by the ZCU to indicate that the charging of the battery 201 ends.

[0078] In some embodiments, in combination with the above, generally the voltage output by the power battery 206 is high, and the battery 201 cannot directly charge based on the high voltage output by the power battery 206. At this time, as shown in FIG. 2, a DCDC converter can be connected between the power battery 206 and the battery 201 to convert the high-voltage direct current output by the power battery 206 into low-voltage direct current, thereby charging the battery 201. Figure 2

[0079] In this scenario, the VCU 204 is further configured to receive the 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 a hybrid vehicle, the VCU described above 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, and the control logic of the HCU is similar to that of the VCU, which will not be described here.

[0081] The HBMS 205, i.e., the HBMS (High Voltage Battery Management System), is used to detect parameters such as voltage, current, temperature, SOC, SOH, etc. of the power battery 206.

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

[0083] In some embodiments, as shown in FIG. 2, the ZCU 203 can also be connected with a gateway, so as to generate an alarm information in the case of a charging failure of the battery 201, and display the alarm information through the gateway. Figure 2

[0084] Optionally, as shown in FIG. 2, the gateway can be connected with a sound host of the vehicle and a vehicle networking communication module. The ZCU 203 can forward the alarm information to the sound host based on the gateway, so as to display the alarm information through the sound host; and the ZCU 203 can forward the alarm information to the vehicle networking communication module based on the gateway, so as to upload the alarm information to the cloud through the vehicle networking communication module. Figure 2

[0085] Among them, the vehicle networking communication module can be a T-Box (Telematics Box) of the vehicle, 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 battery 201, LBMS 202, ZCU 203, VCU 204, HBMS 205 and power battery 206 are only examples, and other existing or future battery, LBMS, ZCU, VCU, HBMS and power battery that can be 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 hereby included by reference.

[0087] ​​The controller 102 and the ZCU 204 can be a general CPU (Central Processing Unit), a NP (Network Processor), a microprocessor, or one or more integrated circuits for implementing the scheme of the present application, such as an ASIC (Application-Specific Integrated Circuit), a PLD (Programmable Logic Device), or a combination thereof. The PLD can be a CPLD (Complex Programmable Logic Device), an FPGA (Field-Programmable Gate Array), a 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 explaining the technical scheme of the embodiments of the present application, and does not constitute a limitation on the technical scheme provided by the embodiments of the present application. It can be known by those skilled in the art that, with the evolution of the implementation environment, the technical scheme provided by the embodiments of the present application is also applicable to similar technical problems.

[0089] Next, the charging control method provided by the embodiments of the present application will be explained in detail.

[0090] Figure 3 is a flowchart of a charging control method provided by the embodiments of the present application, and the method is applied to the controller 102 or the ZCU 204. Please refer to Figure 3 The method includes the following steps.

[0091] Step 301: Obtain the current SOC in the charging process of the storage battery.

[0092] It should be noted that, since the present application is mainly used for implementing the charging control of the storage battery, that is, only in the scenario where the storage battery needs to be charged, step 201 will be executed. Based on this, in some scenarios, the SOC and / or the discharge voltage of the storage battery can be obtained periodically; in the case where the SOC of the storage battery is less than the SOC threshold value and / or the discharge voltage of the storage battery is less than the voltage threshold value, it is considered that the current power of the storage battery is insufficient, and the charging needs to be performed, and step 201 is executed.

[0093] SOC is the state of charge of the battery, which is used to indicate the percentage of the remaining capacity of the battery relative to the rated capacity of the battery, i.e., the remaining capacity of the current battery.

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

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

[0096] For example, the controller can 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, so as to realize the 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 is determined, the target SOC being the SOC to be reached by the battery in 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, the first mapping relationship being used to indicate the mapping relationship between the SOC difference and the charging current. The theoretical charging voltage corresponding to the current difference is determined based on a second mapping relationship, the second mapping relationship being 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 determined 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 use requirements. The embodiments of the present application do not make any limitation in this regard.

[0099] In other embodiments, as shown in Figure 4 the current SOC and the target SOC, the target charging current corresponding to the SOC difference between the current SOC and the target SOC can also be determined by a proportional, integral and differential control algorithm; and then, 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 is determined by a proportional, integral and differential control algorithm.

[0100] 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 stands for integral control, and D stands for derivative control. The specific control algorithm can be determined based on 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 logic for determining the target charging current and theoretical voltage is basically the same for various PID control algorithms, this explanation will only take the PID algorithm for determining the target charging current as an example.

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

[0103] In some embodiments, the current battery temperature during the battery charging process can be obtained; based on the current battery temperature and the current SOC of the power battery, the target SOC corresponding to the battery can be determined, where the power battery refers to the battery that charges the battery.

[0104] Optionally, in such Figure 2 In the scenario shown, the ZCU can obtain the current battery temperature of the battery based on the LBMS, and 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 of the battery based on the current battery temperature and the current SOC of the power battery.

[0105] In some embodiments, based on the current battery temperature and the state of charge (SOC) of the power battery, a target SOC for the battery is determined through a third mapping relationship. This third mapping relationship indicates the mapping relationship between battery temperature, power battery SOC, and the target SOC. The third mapping relationship can be a mapping function or mapping table determined based on experimental statistical data and expert experience, and can be flexibly selected based on actual usage requirements. This application does not limit this selection.

[0106] It should be noted that the target SOC that the storage battery can reach is different in the case of different battery temperatures of the storage battery. For example, in the case of a higher battery temperature, in order to reduce the thermal stress of the storage battery and prevent the storage battery from overheating, the target SOC of the storage battery can be reduced compared to the 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 reach is also different in the case of different SOCs of the power battery. For example, if the SOC of the power battery is low, it indicates that the power battery can provide less electric energy. At this time, considering that as the SOC of the power battery decreases, the charging voltage and the maximum charging current that the power battery can provide will also decrease, thereby affecting the charging efficiency of the storage battery. Based on this, in the case of a low SOC of the power battery, in order to ensure the charging efficiency of the storage battery, the target SOC of the storage battery can be reduced.

[0108] In some embodiments, the current battery temperature in the charging process of the storage battery can be obtained; based on the current SOC and the current battery temperature of the storage battery, the upper limit and the lower limit of the charging voltage corresponding to the storage battery are determined; based on the upper limit and the lower limit 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; and 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 storage battery can withstand varies in different states (such as different SOCs or different battery temperatures of the storage battery), after the theoretical voltage of the storage battery is determined, the theoretical voltage can be corrected based on the actual state of the storage battery.

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

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

[0112] The method for determining the upper limit and the lower limit of the charging voltage corresponding to the storage 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 storage 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 storage 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 storage battery, indicating that the currently determined theoretical charging voltage is too large, the theoretical charging voltage is corrected to the upper limit of the charging voltage corresponding to the storage battery; if the theoretical charging voltage is less than or equal to the lower limit of the charging voltage corresponding to the storage battery, indicating that the currently determined theoretical charging voltage is too small, the theoretical charging voltage is corrected to the lower limit of the charging voltage corresponding to the storage battery.

[0114] Step 303: 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 value, the historical charging voltage being the charging voltage of the storage battery at the last time in the current charging process, and the maximum jump threshold value being used to indicate the maximum change amount of the charging voltage in a single adjustment in the charging process of the storage battery.

[0115] Optionally, the maximum jump threshold value can be determined based on actual use requirements, such as based on experimental statistical data. For example, the maximum jump threshold value can be 0.2V (volt).

[0116] In some embodiments, the maximum jump threshold value can also be a voltage unit time change threshold value, i.e., a change threshold value of the charging voltage per unit time in the charging process of the storage battery, such as 0.2V / S (volt per second).

[0117] In combination with the above example, if the controller determines the target charging voltage of the storage battery once every 10ms, the historical charging voltage is the target charging voltage determined last time, i.e., 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 is corrected based on the type of the maximum jump threshold value through different judgment methods.

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

[0119] For example, if the maximum jump threshold is a voltage unit time change threshold, such as 0.2 V / S, the voltage unit change difference between the target charging voltage and the historical charging voltage is determined based on the voltage difference between the target charging voltage and the historical charging voltage and the interval length between the target charging voltage and the historical charging voltage, and the target charging voltage is corrected by the size relationship between the voltage unit change difference and the maximum jump threshold.

[0120] Since the correction principle of the maximum jump threshold being a voltage difference threshold is similar to the correction principle of the maximum jump threshold being a voltage unit time change threshold, only the correction principle of the maximum jump threshold being a voltage difference threshold is described below.

[0121] In some embodiments, 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 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; if 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.

[0122] It should be noted that in the single adjustment of the charging voltage, the first voltage adjustment threshold is the maximum voltage that the adjusted voltage can increase compared to the historical charging voltage, and the second voltage adjustment threshold is the maximum voltage that the adjusted voltage 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, which can be flexibly adjusted based on the use requirements. For example, the first voltage adjustment threshold and the second voltage adjustment threshold can both be 0.2 V; for another example, the first voltage adjustment threshold can be 0.2 V and the second voltage adjustment threshold can be 0.3 V.

[0123] It should also be noted that if the target charging voltage is greater than the historical charging voltage, it indicates that the charging voltage of the storage battery needs to be increased, and 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 of the target charging voltage compared to the historical charging voltage is large, and therefore the target charging voltage needs to be reduced. Moreover, since the maximum value that the charging voltage can increase this time is the sum of the historical charging voltage and the first voltage adjustment threshold, the target charging voltage can be corrected to this sum.

[0124] Similarly, if the target charging voltage is less than the historical charging voltage, it indicates that the charging voltage of the storage battery needs to be reduced at present. 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 with the historical charging voltage, and therefore the target charging voltage needs to be increased. Moreover, since the minimum value that the charging voltage can be reduced this time 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, the historical charging voltage is 13V, and 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, i.e. 13.2V. For another example, the target charging voltage is 12V, the historical charging voltage is 13.2V, and 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, i.e. 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 of the target charging voltage compared with the historical charging voltage is small, and therefore the target charging voltage can not be corrected.

[0127] Similarly, if 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 less than or equal to the second voltage adjustment threshold, it indicates that the decrease of the target charging voltage compared with the historical charging voltage is small, and therefore the target charging voltage can not be corrected.

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

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

[0130] Optionally, if the electric energy required for charging the storage 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, so as to charge the storage 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 converted by the DCDC is the corrected target charging voltage.

[0131] For example, in the scenario as shown in FIG. 8, the ZCU can 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, so as to charge the battery based on the corrected target charging voltage. Figure 2

[0132] In some embodiments, the actual charging voltage of the battery can be acquired; in the case that the difference between the actual charging voltage and the corrected target charging voltage is greater than the charging failure threshold, the charging of the battery is stopped, and the alarm information is sent.

[0133] The charging failure threshold can be flexibly determined in combination with the actual use requirement. For example, the charging failure 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 failure 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 failure. In order to avoid the abnormal charging to cause a security risk in the charging process of the battery, the charging of the battery can be immediately stopped, and the alarm information can be generated and sent, so as to ensure the safety in the charging process of the battery.

[0135] For example, in the scenario as shown in FIG. 8, the ZCU can 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, so as to charge the battery based on the corrected target charging voltage. Figure 2 For example, in the scenario as shown in FIG. 8, the ZCU can 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, so as to charge the battery based on the corrected target charging voltage.

[0136] In the embodiments of the present application, the current SOC in the charging process of the battery is acquired, and the target SOC in the charging process of the battery is determined, so as to adjust the target charging voltage of the battery in real time based on the current SOC and the target SOC of the battery, thereby improving the charging efficiency in the charging process of the battery. Moreover, after the target charging voltage is determined, 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 the sudden change of the charging voltage, and improving the charging stability of the battery.​

[0137] And in determining the target charging voltage corresponding to the battery, first, the target charging current required for the battery to reach the target SOC is determined through 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, the target charging voltage can be ensured to be the charging voltage corresponding to the charging current required for the actual charging of the battery, so as to improve the accuracy of the determined target charging voltage, thereby improving the charging efficiency of the battery.

[0138] And since the charging capacity of the battery varies at different battery temperatures, and the actual power supply capacity of the power battery also varies at different SOCs. Therefore, in determining the target SOC of the battery, the target SOC required for the battery to reach can be determined in combination with the battery temperature of the battery and the current SOC of the power battery, that is, the influence of the charging capacity of the battery at the battery temperature on the target SOC and the influence 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 charging process of the battery, and improve the determination flexibility of 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 judged whether there is an abnormal fault in the charging process of the battery, so that in the case that the battery has a charging fault, the charging of the battery is ended in time, and an alarm information is sent, so as to improve the safety in the charging process of the battery.

[0140] Figure 5 is a structural schematic diagram of a charging control device provided by an embodiment of the present application, please refer to Figure 5 The device comprises 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 configured to acquire the current state of charge (SOC) in the charging process of the battery.

[0142] The voltage determination module 502 is configured to determine the target charging voltage corresponding to the battery based on the current SOC.

[0143] The voltage correction module 503 is configured to correct the target charging voltage based on the target charging voltage and the historical charging voltage, so that a difference between the corrected target charging voltage and the historical charging voltage is less than or equal to a maximum jump threshold, the historical charging voltage is a charging voltage of the storage battery at a previous moment in a current charging process, and the maximum jump threshold is used to indicate a maximum variation of a single adjustment of the charging voltage in the charging process of the storage battery.

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

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

[0146] The charging current determination sub-module is configured to determine an SOC difference between the current SOC and a target SOC, and determine a target charging current corresponding to the SOC difference, the target SOC being an SOC to be reached by the storage battery in the current charging.

[0147] The current difference determination sub-module is configured to obtain a current charging current of the storage battery, and determine a current difference between the current charging current and the target charging current.

[0148] The target charging voltage determination sub-module is configured to determine a theoretical charging voltage corresponding to the current difference, and determine the theoretical charging voltage as the target charging voltage.

[0149] Optionally, the parameter acquisition module 501 is further configured to acquire a current battery temperature in the charging process of the storage battery.

[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 a current SOC of a power battery, the power battery being a battery used to charge the storage battery.

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

[0152] in a case where the target charging voltage is greater than the historical charging voltage and a voltage difference between the target charging voltage and the historical charging voltage is greater than a first voltage adjustment threshold, correct the target charging voltage to a sum of the historical charging voltage and the first voltage adjustment threshold, the first voltage adjustment threshold being less than or equal to the maximum jump threshold;

[0153] in a case where the target charging voltage is less than the historical charging voltage and a voltage difference between the historical charging voltage and the target charging voltage is greater than a second voltage adjustment threshold, correct the target charging voltage to a difference between the historical charging voltage and the first voltage adjustment threshold, the second voltage adjustment threshold being less than or equal to the maximum jump threshold.

[0154] Optionally, the parameter acquisition module 501 is further configured to acquire a current battery temperature in the charging process of the storage battery.

[0155] The voltage determination sub-module is further configured to determine an upper limit of the charging voltage and a lower limit of the charging voltage corresponding to the battery based on the current SOC and the current battery temperature of the battery, correct the theoretical charging voltage based on the upper limit of the charging voltage and the lower limit of the 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 configured to acquire an actual charging voltage of the battery.

[0157] The charging module 504 is further configured to stop charging the battery and send an alarm information in a case where a difference between the actual charging voltage and the corrected target charging voltage is greater than a charging failure threshold.

[0158] In the embodiments of the present application, the current SOC in the battery charging process is acquired, and the target SOC in the battery charging process is determined, so that 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 in the battery charging process. Moreover, after the target charging voltage is determined, 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 an 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 the target charging voltage corresponding to the battery is determined, the target charging current required for the battery to reach the target SOC is determined through the SOC difference between the current SOC and the target SOC of the battery, 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, the target charging voltage can be ensured to be the charging voltage corresponding to the charging current required for the actual charging of the battery, so as to improve the accuracy of the determined target charging voltage and thereby improve the charging efficiency of the battery.

[0160] Moreover, the power of the battery varies at different battery temperatures, and the actual power supply capacity of the power battery also varies at different SOCs. Therefore, when the target SOC of the battery is determined, the target SOC required for the battery can be determined in combination with the battery temperature of the battery and the current SOC of the power battery, that is, the influence of the power of the battery at the battery temperature on the target SOC and the influence 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 in the battery charging process and improve the determination flexibility of the target SOC.

[0161] In addition, the actual charging voltage of the battery is also acquired, and based on the target charging voltage output by the power battery and the actual charging voltage of the battery, it is judged whether an abnormal fault exists in the charging process of the battery, so that in the case that the charging fault exists in the battery, the charging of the battery is ended in time, and the alarm information is sent, so as to improve the safety in the charging process of the battery.

[0162] It should be noted that: the charging control device provided by the above embodiment is only exemplified by the division of the above functional modules when realizing the charging of the battery. In actual application, the above functions can be completed by different functional modules according to the needs, 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 and the charging control method provided by the above 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 is a structural block diagram of a vehicle 600 provided by an embodiment of the present application. Generally, the vehicle 600 includes a controller 601 and a memory 602.

[0164] The controller 601 can include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The controller 601 can be implemented in at least one hardware form of a DSP (Digital Signal Processing), an FPGA (Field Programmable Gate Array), and a PLA (Programmable Logic Array). The controller 601 can also include a main processor and a coprocessor. The main processor is a processor for processing data in a wake-up 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 can be integrated with a GPU (Graphics Processing Unit) that is responsible for rendering and drawing the content required to be displayed by the display screen. In some embodiments, the controller 601 can also include an AI (Artificial Intelligence) processor for processing machine learning-related computing operations.

[0165] The memory 602 can include one or more non-transitory computer-readable storage media. The memory 602 can also include high-speed random access memory and nonvolatile memory, such as one or more magnetic disk storage devices, flash memory devices. In some embodiments, the non-transitory computer-readable storage medium in the memory 602 is used to store at least one instruction for being executed by the controller 601 to implement the charging control method provided by the method embodiments in the present application.

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

[0167] 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 by software, it can be implemented in the form of a computer program product entirely or partially. 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.

[0168] That is, in some embodiments, a computer program product including instructions, which when run on a computer, causes the computer to perform the steps of the charging control method described above.

[0169] It should be understood that "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, " / " represents the meaning of or, for example, A / B can represent A or B; "and / or" herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist together, and B exists alone. In addition, in order to clearly describe the technical solutions of the embodiments of the present application, "first", "second", etc. are used to distinguish the same items or similar items with basically the same functions and effects in the embodiments of the present application. Those skilled in the art can understand that "first", "second", etc. do not limit the quantity and execution order, and "first", "second", etc. also do not limit the difference.

[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 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 related data need to comply with relevant laws, regulations and standards of relevant countries and regions.

[0171] The above describes the embodiments provided by the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A charge control method characterized by, The method comprises: obtaining a current state of charge SOC in a charging process of the battery; determining a SOC difference between the current state of charge SOC and a target SOC, and determining a target charging current corresponding to the SOC difference, the target SOC being a SOC to be reached by the battery in the current charging process; obtaining a current charging current of the battery, and determining a current difference between the current charging current and the target charging current; determining a theoretical charging voltage corresponding to the current difference, and determining the theoretical charging voltage as a target charging voltage corresponding to the battery; in a case where the target charging voltage is greater than a historical charging voltage, and a voltage difference between the target charging voltage and the historical charging voltage is greater than a first voltage adjustment threshold, correcting the target charging voltage to a sum of the historical charging voltage and the first voltage adjustment threshold, the first voltage adjustment threshold being less than or equal to a maximum jump threshold, the historical charging voltage being a charging voltage of the battery at a previous time in the current charging process, and the maximum jump threshold being used to indicate a maximum variation of a single adjustment of the charging voltage in the charging process of the battery; in a case where the target charging voltage is less than the historical charging voltage, and a voltage difference between the historical charging voltage and the target charging voltage is greater than a second voltage adjustment threshold, correcting the target charging voltage to a difference between the historical charging voltage and the first voltage adjustment threshold, the second voltage adjustment threshold being less than or equal to the maximum jump threshold; charging the battery based on the corrected target charging voltage.

2. The method of claim 1, wherein, The method further comprises: obtaining a current battery temperature in the charging process of the battery; determining a target SOC corresponding to the battery based on the current battery temperature and a current state of charge SOC of a power battery, the power battery being a battery used to charge the battery.

3. The method of claim 1, wherein, The method further comprises: obtaining a current battery temperature in the charging process of the battery; determining an upper limit of a charging voltage and a lower limit of the charging voltage corresponding to the battery based on a current state of charge SOC of the battery and the current battery temperature; correcting the theoretical charging voltage based on the upper limit of the charging voltage and the lower limit of the 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; The method further comprises: obtaining an actual charging voltage of the battery; 4. The method of claim 1, wherein, in a case where a difference between the actual charging voltage and the corrected target charging voltage is greater than a charging fault threshold, stopping charging the battery, and sending an alarm information. The device comprises: a parameter obtaining module configured to obtain a current state of charge SOC in a charging process of the battery; 5. A charge control device, characterized by comprising: ​ ​ The voltage determination module is configured to determine a SOC difference between the current SOC and a target SOC, and determine a target charging current corresponding to the SOC difference, the target SOC being a SOC to be reached by the battery in the current charging; acquire a current charging current of the battery, and determine a current difference between the current charging current and the target charging current; determine a theoretical charging voltage corresponding to the current difference, and determine the theoretical charging voltage as a target charging voltage corresponding to the battery; The voltage correction module is configured to correct the target charging voltage to a sum of a historical charging voltage and the first voltage adjustment threshold when the target charging voltage is greater than the historical charging voltage, and a voltage difference between the target charging voltage and the historical charging voltage is greater than a first voltage adjustment threshold, the first voltage adjustment threshold being less than or equal to a maximum jump threshold, the historical charging voltage being a charging voltage of the battery at a previous time in the current charging process, and the maximum jump threshold being used to indicate a maximum variation of single adjustment of the charging voltage in the charging process of the battery. The voltage correction module is configured to correct the target charging voltage to a difference between the historical charging voltage and the first voltage adjustment threshold when the target charging voltage is less than the historical charging voltage, and a voltage difference between the historical charging voltage and the target charging voltage is greater than a second voltage adjustment threshold, the second voltage adjustment threshold being less than or equal to the maximum jump threshold. The charging module is configured to charge the battery based on the corrected target charging voltage.

6. A vehicle characterized by comprising: The vehicle comprises a memory and a controller, the memory is configured to store a computer program, and the controller is configured to execute the computer program stored in the memory to implement the steps of the method of any one of claims 1-4.

7. A non-transitory computer-readable storage medium, comprising: The storage medium stores a computer program, and the computer program is executed by the controller to implement the steps of the method of any one of claims 1-4.

8. A computer program product comprising instructions, characterized in that, The instructions, when executed on the computer, cause the computer to perform the steps of the method of any one of claims 1-4.

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