Charging method, apparatus and system, controller, and storage medium

Abstract

Embodiments of the present application relate to the technical field of charging and discharging of new energy vehicles, and provide a charging method, apparatus and system, a controller, and a storage medium. Each time a storage battery is charged, multiple parameters of a vehicle are comprehensively considered, and the charging mode and the charging amount for the storage battery are dynamically adjusted, so as to achieve the purpose of saving energy. The method comprises: obtaining an adjustment strategy for the charging voltage of a storage battery according to the magnitude relationship between a first charge state of the storage battery and a target ideal charge state of the storage battery, wherein the adjustment strategy is to increase a charge state collected next time to reduce the voltage required for the next charging, or to reduce the voltage required for the current charging; according to the adjustment strategy, adjusting an initial charging voltage corresponding to the current temperature to obtain a charging voltage; and according to the charging voltage, controlling a charging and discharging assembly to charge the storage battery.

Description

Charging method, device, system, controller and storage medium

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on October 31, 2023, with application number 202311437232.9 and application name “Charging method, device, system, controller and storage medium”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of new energy vehicle charging and discharging technology, and in particular to a charging method, device, system, controller, and storage medium. Background Art

[0003] As new energy vehicles (e.g., fuel cell electric vehicles, pure electric vehicles, and hybrid vehicles) gain increasing market share, energy conservation has become a necessary research direction for these vehicles. These vehicles typically utilize both high-voltage and low-voltage electrical systems, with a 300V or higher power battery providing power to the drive motor and a 12V battery providing standby power to the vehicle's controllers during periods of inactivity.

[0004] In the related art, battery charging only considers the influence of ambient temperature, ignoring the possible influence of other parameters in the actual operation of the vehicle on battery charging. Therefore, adjusting the battery charging method only according to the external temperature is not conducive to the energy conservation and emission reduction needs of new energy vehicles.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a charging method, device, system, controller, and storage medium. Each time the battery is charged, multiple parameters of the entire vehicle are comprehensively considered, and the charging method and charging amount of the battery are dynamically adjusted to achieve the purpose of energy saving.

[0007] In a first aspect, an embodiment of the present application provides a charging method, which is applied to a controller, and the method includes: obtaining an adjustment strategy for the battery charging voltage based on the relationship between the first charge state of the battery and the target ideal charge state of the battery; the adjustment strategy is to reduce the voltage requirement corresponding to the next charge by increasing the charge state collected next time, or to reduce the voltage requirement corresponding to the current charge; adjusting the initial charging voltage corresponding to the current temperature according to the adjustment strategy to obtain the charging voltage; and controlling the charge and discharge assembly to charge the battery according to the charging voltage.

[0008] The charging method proposed in the embodiment of the present application starts from the charging efficiency that can be achieved by the current charge state of the battery, and predicts the optimal charging voltage required for the battery to replenish from the current charge state to the ideal charge state according to the difference between the current charge state of the battery and the target ideal charge state. Charging the battery with this charging voltage can quickly replenish the charge state, so that the battery can reach the ideal charge state in the subsequent charging process. The ideal charge state can achieve power replenishment at a lower voltage, thereby achieving energy saving; or, directly determine the minimum voltage for achieving the current charge according to the difference between the current charge state of the battery and the target ideal charge state, and charge at a low voltage to reduce the charging power, thereby reducing unnecessary energy consumption in the battery charging process, and meeting the needs of energy conservation and emission reduction of new energy vehicles.

[0009] In one possible implementation, obtaining a voltage adjustment strategy based on a magnitude relationship between the first state of charge and the target ideal state of charge includes:

[0010] calculating a difference between the first state of charge and the target ideal state of charge;

[0011] Searching for a target compensation voltage corresponding to the actual charge difference in a pre-calibrated correspondence between the charge state difference and the compensation voltage;

[0012] When the first state of charge is less than the target ideal state of charge, the target compensation voltage is superimposed on the initial charging voltage corresponding to the current temperature as the adjustment strategy.

[0013] In one possible implementation, obtaining a voltage adjustment strategy based on a magnitude relationship between the first state of charge and the target ideal state of charge includes:

[0014] calculating a difference between the first state of charge and the target ideal state of charge;

[0015] Searching for a target compensation voltage corresponding to the actual charge difference in a pre-calibrated correspondence between the charge state difference and the compensation voltage;

[0016] When the first state of charge is greater than the target ideal state of charge, obtaining an initial charging voltage corresponding to the current temperature minus the target compensation voltage as the adjustment strategy;

[0017] When the first state of charge is equal to the target ideal state of charge, maintaining the initial charging voltage corresponding to the current temperature is obtained as the adjustment strategy.

[0018] In one possible implementation, the method further includes:

[0019] Collecting the current battery health factor of the battery;

[0020] Searching for a target voltage compensation coefficient corresponding to the current battery health coefficient in a pre-calibrated correspondence between a battery health coefficient and a voltage compensation coefficient;

[0021] Adjusting the initial charging voltage corresponding to the current temperature according to the adjustment strategy to obtain the charging voltage includes:

[0022] The initial charging voltage corresponding to the current temperature is adjusted according to the adjustment strategy and the target voltage compensation coefficient to obtain a charging voltage.

[0023] In one possible implementation, the method further includes:

[0024] Collecting energy recovery status, the second state of charge of the power battery, and the power battery power;

[0025] Obtaining an adjustment strategy for the battery charging voltage based on a magnitude relationship between the first state of charge of the battery and the target ideal state of charge of the battery includes:

[0026] When the energy recovery state of the power battery is in the off mode, and the second charge state and the power battery power do not support energy recovery of the power battery, an adjustment strategy for the battery charging voltage is obtained according to a size relationship between the first charge state of the battery and the target ideal charge state of the battery.

[0027] In one possible implementation, the method further includes:

[0028] When the energy recovery state of the power battery is in the on mode, and the second charge state and the power battery power support energy recovery of the power battery, the maximum DC converter setting voltage is determined to be the charging voltage.

[0029] In one possible implementation, the method further includes:

[0030] collecting the first state of charge and current temperature of the battery;

[0031] Searching for the target ideal state of charge corresponding to the current temperature in a pre-calibrated correspondence between battery temperature and ideal state of charge;

[0032] The initial charging voltage corresponding to the current temperature is searched in a pre-calibrated correspondence between the battery temperature and the initial charging voltage.

[0033] In one possible implementation, during the periodic charging process, after the battery is charged by controlling the charge-discharge assembly according to the charging voltage for the nth time, the method further includes:

[0034] Recording the amount of electricity charged to the battery for the nth time;

[0035] Before obtaining, for the (n+1th)th time, a strategy for adjusting the charging voltage of the battery based on the magnitude relationship between the first state of charge of the battery and the target ideal state of charge of the battery, the method further includes:

[0036] Collect the total discharge amount of the battery after the charging process from the n+1-ith time to the nth time; i is the number of charging times from the last full charge of the battery or the first power-on to the nth charge;

[0037] Accumulate the charging power recorded in each charging process from the n+1-ith time to the nth time to obtain the total charging power;

[0038] The (n+1)th time, according to the relationship between the first state of charge of the battery and the target ideal state of charge of the battery, obtains an adjustment strategy for the charging voltage of the battery, including:

[0039] When the sum of the total discharge amount and the total charge amount is less than a preset multiple of the battery capacity, an adjustment strategy for the battery charging voltage is obtained according to a magnitude relationship between the first charge state of the battery and the target ideal charge state of the battery.

[0040] In one possible implementation, when the sum of the total discharge amount and the total charge amount is greater than or equal to a preset multiple of the battery capacity, a preset voltage for fully charging the battery is used as the charging voltage;

[0041] The n+1 charging processes are recorded as the latest full charge.

[0042] In one possible implementation, during the periodic charging process, if the battery is fully charged according to a preset voltage for fully charging the battery during the n+1th charging process, and the battery is fully charged, after the battery is fully charged according to the preset voltage for fully charging the battery during the n+1th charging process, the method further includes:

[0043] monitoring a first state of charge or a charging current of the battery within a preset time period;

[0044] During the (n+2)th charging process, obtaining an adjustment strategy for the battery charging voltage according to a relationship between the first state of charge of the battery and the target ideal state of charge of the battery includes:

[0045] When the first state of charge of the battery is greater than a state of charge threshold within a preset time period, or the charging current of the battery is less than a current threshold within a preset time period, an adjustment strategy for the battery charging voltage is obtained based on the relationship between the first state of charge of the battery and the target ideal state of charge of the battery.

[0046] In a second aspect, an embodiment of the present application provides a charging device, which is provided in a controller, and the device includes:

[0047] a comparison module, configured to obtain an adjustment strategy for the battery charging voltage based on a relationship between the first state of charge of the battery and a target ideal state of charge of the battery; the adjustment strategy is to reduce the voltage requirement corresponding to the next charge by increasing the charge state collected next time, or to reduce the voltage requirement corresponding to the current charge;

[0048] an adjustment module, configured to adjust the initial charging voltage corresponding to the current temperature according to the adjustment strategy to obtain a charging voltage;

[0049] The control module is used to control the charge and discharge assembly to charge the battery according to the charging voltage.

[0050] In a third aspect, an embodiment of the present application provides a charging system, which includes a battery DC sensor, a charge and discharge assembly, a controller, and a battery; wherein,

[0051] The battery DC sensor is used to collect the first charge state of the battery;

[0052] The controller is configured to obtain an adjustment strategy for the battery charging voltage based on a relationship between the first state of charge of the battery and a target ideal state of charge of the battery; adjust the initial charging voltage corresponding to the current temperature according to the adjustment strategy to obtain a charging voltage; and issue an instruction to the charge-discharge assembly according to the charging voltage;

[0053] The charging and discharging assembly is used to charge the battery in response to instructions issued by the vehicle controller.

[0054] In a fourth aspect, an embodiment of the present application provides a controller comprising: at least one processor; and at least one memory communicatively connected to the processor, wherein: the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the method provided in the first aspect.

[0055] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions enable the computer to execute the method provided in the first aspect.

[0056] It should be understood that the second to fifth aspects of the embodiments of the present application are consistent with the technical solutions of the first aspect of the embodiments of the present application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation methods are similar and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0058] FIG1 is a schematic diagram of a charging system proposed in an embodiment of the present application;

[0059] FIG2 is a flowchart of the charging method steps proposed in an embodiment of the present application;

[0060] FIG3 is a flowchart of another charging method proposed in an embodiment of the present application;

[0061] FIG4 is a flowchart of another charging method proposed in an embodiment of the present application;

[0062] FIG5 is a schematic diagram of a charging system application scenario structure shown as an example of the present application;

[0063] FIG6 is a flow chart of an example controller for determining a charging voltage according to the present application;

[0064] FIG7 is a functional module diagram of a charging device proposed in an embodiment of the present application;

[0065] FIG8 is a schematic diagram of the structure of a controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0066] In order to better understand the technical solutions of this specification, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0067] It should be clear that the embodiments described are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this specification.

[0068] The terms used in the examples of this application are for the purpose of describing specific embodiments only and are not intended to limit this specification. The singular forms "a," "an," "the," and "the" used in the examples of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0069] In existing technologies, batteries are charged by outputting a fixed DC voltage based solely on the external temperature. However, since the battery's state is constantly changing, charging the battery with a fixed DC voltage cannot keep up with the battery's changing state. This can lead to the following consequences: energy is wasted when the battery cannot support the charge amount of the fixed DC voltage; and when the entire battery system can store large amounts of current, the fixed DC voltage cannot meet the requirement for rapid charging.

[0070] In view of the above problems, this application proposes a charging method to collect multiple parameters related to the battery during vehicle driving, conduct a comprehensive analysis of the multiple parameters, and dynamically adjust the charging voltage of the battery so that the charging voltage of the battery always meets the real-time needs of the battery.

[0071] The charging method is applied to a controller of a charging system. For a hybrid vehicle, the controller may be a hybrid system vehicle controller (Hybrid Control Unit, HCU), and for a pure electric vehicle, the controller may be a vehicle control unit (VCU).

[0072] Figure 1 is a schematic diagram of a charging system proposed in an embodiment of the present application. The charging system includes a controller, an Intelligent Battery Sensor (IBS), a Charge and Discharge Unit (CDDU), and a battery. As shown in Figure 1, the IBS is connected to the controller and the battery, with the other end of the controller connected to the CDDU, which in turn is connected to the battery. The IBS collects relevant battery parameters and feeds them back to the controller. The controller calculates the real-time voltage and charging instructions for charging the battery based on these parameters. The controller then sends the charging instructions to the CDDU, which responds to the instructions by outputting a voltage to complete battery charging.

[0073] Wherein, the battery DC sensor is used to collect the first charge state of the battery;

[0074] The controller is configured to obtain an adjustment strategy for the battery charging voltage based on a relationship between the first state of charge of the battery and a target ideal state of charge of the battery; adjust the initial charging voltage corresponding to the current temperature according to the adjustment strategy to obtain a charging voltage; and issue an instruction to the charge-discharge assembly according to the charging voltage;

[0075] The charging and discharging assembly is used to charge the battery in response to instructions issued by the vehicle controller.

[0076] FIG2 is a flowchart of the charging method steps proposed in an embodiment of the present application. As shown in FIG2 , the controller performs the following steps in the current charging process:

[0077] Step S21: obtaining an adjustment strategy for the battery charging voltage according to a magnitude relationship between the first state of charge of the battery and the target ideal state of charge of the battery.

[0078] The adjustment strategy is to reduce the voltage requirement corresponding to the next charge by increasing the charge state collected next time, or to reduce the voltage requirement corresponding to the current charge. The target ideal charge state can be obtained by pre-calibration.

[0079] The IBS collects a first state of charge of the battery. The controller receives the first state of charge collected by the IBS and analyzes a charging voltage that the battery can currently support based on the first state of charge.

[0080] The state of charge (SOC) reflects the actual capacity of the battery. The SOC concentration near the electrode and the operating temperature determine the amount of electrical energy the battery can store per unit time. At the same charging voltage at a specific temperature, a battery that reaches an ideal state of charge has higher charging efficiency.

[0081] In view of the nature of the above-mentioned charge state, the present application collects the battery's current first charge state. It can be understood that the battery's current first charge state reflects the charge state of the vehicle when it is traveling to the current state, and the target ideal charge state reflects the optimal charge state for completing battery charging under the current driving state. The first charge state is compared with the target ideal charge state, so that when the first charge state can meet the target ideal charge state, for example, when the first charge state is greater than or equal to the target ideal charge state, a smaller charging voltage is used to reduce the charging power and achieve energy saving in battery charging.

[0082] Moreover, when the current first state of charge of the battery cannot meet the target ideal state of charge, a method of quickly replenishing the battery SOC can be adopted so that the battery can meet the real-time target ideal state of charge during the next charging and the next charging, thereby enabling the subsequent charging process to use less power and achieve the purpose of energy conservation and emission reduction.

[0083] Step S22: adjusting the initial charging voltage corresponding to the current temperature according to the adjustment strategy to obtain a charging voltage.

[0084] Step S23: controlling the charge-discharge assembly to charge the battery according to the charging voltage.

[0085] The controller can generate a charging instruction based on the charging voltage and send the charging instruction to the CDDU. The CDDU responds to the charging instruction and outputs the charging voltage to the battery.

[0086] The above charging method is based on the constantly changing battery parameters and battery temperature during vehicle driving. According to the size relationship of the target ideal charge state of the battery each time, the charging strategy is adjusted so that each charge can obtain the charging voltage that is most suitable for the current battery state, thus solving the problem of energy waste caused by charging at the same voltage each time.

[0087] The embodiment of the present application also proposes an optional implementation method of executing step S21 "obtaining an adjustment strategy for the battery charging voltage based on the relationship between the first charge state of the battery and the target ideal charge state of the battery."

[0088] In one embodiment, executing step S21 includes executing sub-steps:

[0089] S211: Calculate the actual state of charge difference between the first state of charge and the target ideal state of charge. The actual state of charge difference can be expressed as SOC difference = first state of charge - target ideal state of charge.

[0090] S212: Searching for a target compensation voltage corresponding to the actual charge difference in a pre-calibrated correspondence between charge state differences and compensation voltages.

[0091] For example, Table 1 is a table of pre-calibrated charge state differences and compensation voltage correspondences in an example of the present application; by looking up Table 1, the charge required to restore the battery to meet the target ideal charge state and the adaptive voltage to match these charges can be obtained. Table 1:

[0092] S213: When the first state of charge is less than the target ideal state of charge, obtaining the initial charging voltage corresponding to the current temperature superimposed on the target compensation voltage as the adjustment strategy.

[0093] Comparison shows that the first state of charge is smaller than the target ideal state of charge, and it is determined that the battery SOC needs to be supplemented based on the current charging. Therefore, the target compensation voltage is superimposed on the initial charging voltage, and the SOC is quickly supplemented while completing the charging with a larger charging voltage and charging power, so that a smaller charging voltage can be obtained in the subsequent charging.

[0094] Assume that the actual state of charge difference is -9, and the target compensation voltage obtained from Table 1 is 0.63. The initial charging voltage corresponding to the current temperature is adjusted according to the adjustment strategy, and the obtained charging voltage = initial charging voltage + 0.63.

[0095] The embodiment of the present application also proposes an implementation method for determining the initial charging voltage. Starting from the perspective that the SOC concentration near the electrode and the operating temperature determine the amount of electrical energy stored by the battery per unit time, the temperature factor is combined with the SOC factor to make the determined charging voltage compatible with the battery itself and the internal ambient temperature of the battery.

[0096] The following steps of determining the initial charging voltage may be performed before step S21. The steps of determining the initial charging voltage include:

[0097] S31: Collecting the first state of charge and current temperature of the battery.

[0098] S32: Searching for the target ideal state of charge corresponding to the current temperature in a pre-calibrated correspondence between battery temperature and ideal state of charge.

[0099] The ideal state of charge may represent the SOC concentration at which the battery stores electrical energy with the highest efficiency at a specific temperature.

[0100] For example, Table 2 is a table of pre-calibrated battery temperature and ideal state of charge correspondence in an example of the present application. By looking up Table 2, the SOC concentration that maximizes the battery's energy storage efficiency at the current temperature can be obtained as the target ideal state of charge; Table 2:

[0101] Assuming the IBS detects a battery temperature of 10°C, the controller searches for the target ideal state of charge (SOC) corresponding to the current temperature, which is 85%. If the controller detects that the battery's first SOC has not reached 85%, it needs to replenish the SOC, achieving dynamic SOC adjustment. If the controller detects that the battery's first SOC has reached 85%, it indicates that the battery can be charged at a lower voltage for the current charge. This dynamically adjusts the battery's charging power for the current charge, achieving energy conservation and emission reduction.

[0102] After determining the target ideal state of charge, the initial charging voltage adapted to the current temperature can be further obtained by looking up the table.

[0103] S33: Searching for the initial charging voltage corresponding to the current temperature in a pre-calibrated correspondence between battery temperature and initial charging voltage.

[0104] Table 3 is a table showing the relationship between battery temperature and initial charging voltage, which is pre-calibrated in an example of the present application. By looking up Table 3, one can obtain the initial charging voltage that can support the target ideal state of charge and complete energy conversion with high efficiency based on the current battery temperature. Table 3:

[0105] Assume that the IBS detects a battery temperature of 10°C. The controller searches Table 3 for a target ideal SOC corresponding to the current temperature of 85%. The controller then searches Table 3 to determine an initial charging voltage corresponding to the current temperature of 14V. If the first SOC is less than the target ideal SOC at this time, and the difference between the first SOC and the target ideal SOC is 6, the controller continues to search Table 1 to determine a target compensation voltage of 0.42. The controller then calculates the adjustment strategy by adding the target compensation voltage to the initial charging voltage corresponding to the current temperature. The result is a charging voltage of 14V + 0.42V.

[0106] The controller may execute steps S213 to S214 in parallel.

[0107] S214: When the first state of charge is greater than the target ideal state of charge, obtaining an initial charging voltage corresponding to the current temperature minus the target compensation voltage as the adjustment strategy.

[0108] S215: When the first state of charge is equal to the target ideal state of charge, obtaining an initial charging voltage corresponding to the current temperature as the adjustment strategy.

[0109] Assume that the IBS detects a battery temperature of 0°C. The controller searches Table 3 for a target ideal SOC corresponding to the current temperature, which is 90%. The controller then finds an initial charging voltage of 14.2V corresponding to the current temperature. If the first SOC equals the target ideal SOC, the adjustment strategy is to maintain the initial charging voltage corresponding to the current temperature, calculating a charging voltage of 14.2V.

[0110] Assume that the IBS detects a battery temperature of 30°C. The controller searches Table 3 for a target ideal state of charge corresponding to the current temperature of 70%. The controller then searches Table 3 to determine an initial charging voltage corresponding to the current temperature of 13.8V. If the first state of charge is greater than the target ideal state of charge, and the difference between the first state of charge and the target ideal state of charge is 8, the controller continues to search Table 1 to determine a target compensation voltage of 0.92. The controller then calculates the adjustment strategy by subtracting the target compensation voltage from the initial charging voltage corresponding to the current temperature, calculating the charging voltage as 13.8V - 0.92V.

[0111] The above analysis of the first charge state and the target ideal charge state of the battery obtains a method for adjusting the battery charging voltage strategy, which comprehensively considers the battery operating temperature and the current SOC factors of the battery, and dynamically adjusts the charging voltage so that the charging voltage will not be higher than the charging efficiency that the current remaining SOC of the battery can support at the current temperature, thereby avoiding waste of electric energy; and when the SOC is higher than the ideal charge state that supports charging efficiency at the current temperature, the charging voltage can also be reduced in time to reduce the charging power; on the other hand, the driving process will inevitably cause the battery operating temperature to be in a linear change, and the ideal charge state corresponding to the SOC at different temperatures is also different. At the same time, the SOC is also in a consumption state, so when it is detected that the SOC is less than the ideal charge state, a larger voltage is used to quickly supplement the SOC, so that the next SOC can be charged based on the smaller voltage corresponding to the ideal charge state, so as to achieve timely adjustment of the balance between SOC and charging voltage, which can reduce energy consumption during the entire driving process.

[0112] The present application also provides another charging method. FIG3 is a flowchart of another charging method provided in the present application. As shown in FIG3 , the steps include:

[0113] Step S41: collecting the current battery health factor of the battery.

[0114] Step S42: collecting the first state of charge of the battery.

[0115] An adjustment strategy for the battery charging voltage is obtained according to a magnitude relationship between the first state of charge of the battery and the target ideal state of charge of the battery.

[0116] Step S43: searching for a target voltage compensation coefficient corresponding to the current battery health coefficient in a pre-calibrated correspondence between the battery health coefficient and the voltage compensation coefficient;

[0117] Step S44: adjusting the initial charging voltage corresponding to the current temperature according to the adjustment strategy and the target voltage compensation coefficient to obtain a charging voltage.

[0118] The controller may calculate the charging voltage in the following manner: charging voltage = initial charging voltage + target compensation voltage + initial charging voltage × target voltage compensation coefficient.

[0119] Step S45: controlling the charge-discharge assembly to charge the battery according to the charging voltage.

[0120] The controller collects the battery's first state of charge and current battery health factor (State of Health, SOH) through the IBS, analyzes the battery's degradation state based on the battery's SOH, and performs voltage compensation on the initial charging voltage based on the battery's degradation state. This adjusts the battery's energy storage capacity that decreases due to degradation, ensuring that the battery can complete energy storage at a sufficient voltage.

[0121] Table 4 is a table showing the correspondence between the pre-calibrated battery health factor and the voltage compensation factor in an example of the present application. By looking up Table 4, the voltage percentage for compensating the initial charging voltage based on the current battery health factor of the battery can be obtained; Table 4:

[0122] Assume that the IBS detects a battery temperature of 30°C and a SOH of 70%. The controller searches Table 3 for a target ideal SOC corresponding to the current temperature of 70%. The controller then searches Table 3 to determine an initial charging voltage corresponding to the current temperature of 13.8V. If the first SOC is greater than the target ideal SOC at this time, and the difference between the first SOC and the target ideal SOC is 8, the controller then searches Table 1 to determine a target compensation voltage of 0.92. The controller then obtains the adjustment strategy by subtracting the target compensation voltage from the initial charging voltage corresponding to the current temperature. The controller then searches Table 4 to determine a compensation coefficient corresponding to the SOH of +5%. The initial charging voltage corresponding to the current temperature is adjusted according to the adjustment strategy and the target voltage compensation coefficient. The calculated charging voltage is 13.8V - 0.92V + 13.8V × + 5%.

[0123] In addition to conducting a comprehensive analysis of the battery SOH and battery SOC, compensating for the charge state consumed by battery charging and discharging at the appropriate time based on the analysis results, and compensating for battery attenuation caused by long-term use based on the SOH, the embodiment of the present application also comprehensively considers the influencing factors of the external working environment of the battery. The influencing factors of the external working environment of the battery may refer to the impact of the operation of the power battery on the battery; the power battery has a larger capacity and high performance; therefore, when the controller of the embodiment of the present application determines that brake energy recovery is required, it simultaneously uses the maximum DC converter setting voltage to charge the battery and the power battery to complete energy recovery within a short period of time, thereby achieving the goal of energy saving.

[0124] The present application also provides another charging method. FIG4 is a flowchart of the steps of the charging method provided in the present application. As shown in FIG4 , the steps include:

[0125] Step S51: collecting the energy recovery state, the second charge state of the power battery, and the power battery power.

[0126] Generally, the controller determines whether to perform regenerative braking based on the brake pedal's position, the vehicle's driving status, and the battery's status. If the controller determines that regenerative braking is currently in effect, it will detect that the regenerative braking state is active.

[0127] Step S52: determining the energy recovery state of the power battery, the second charge state, and the power of the power battery.

[0128] Step S53: when the energy recovery state of the power battery is in the on mode, and the second charge state and the power battery power support energy recovery of the power battery, determining the maximum DC converter setting voltage as the charging voltage.

[0129] First, it is determined whether the energy recovery state of the power battery is in the on mode. If the energy recovery state of the power battery is in the on mode, the conditions for high-power charging of the power battery and the storage battery are met. In order to further ensure the effect of energy recovery, the embodiment of the present application also determines whether the power battery can efficiently store electrical energy, and analyzes the SOC of the power battery or the charging power of the power battery to determine whether the power battery has the ability to store a large amount of electrical energy in a short time at the current time.

[0130] Therefore, the embodiment of the present application can first determine the energy recovery state before obtaining the adjustment strategy for the battery charging voltage based on the relationship between the first charge state of the battery and the target ideal charge state of the battery. If the energy recovery state is in the on mode, the conditions for high-power charging of the power battery and the battery are met. It is further determined whether the SOC or charging power of the power battery at the current time can complete high-power charging. If the SOC or charging power of the power battery at the current time can complete high-power charging, the maximum DC converter setting voltage is directly determined to be the charging voltage, thereby controlling the CDDU to output the maximum DC converter setting voltage to charge the battery.

[0131] Executing step S21 can be specifically implemented by executing step S54;

[0132] Step S54: When the energy recovery state of the power battery is in the off mode, and the second charge state and the power battery power do not support energy recovery of the power battery, an adjustment strategy for the battery charging voltage is obtained according to the relationship between the first charge state of the battery and the target ideal charge state of the battery.

[0133] Step S55: adjusting the initial charging voltage corresponding to the current temperature according to the adjustment strategy to obtain a charging voltage.

[0134] After executing step S53 to obtain the charging voltage, or executing steps S54 and S55 to obtain the charging voltage, the controller proceeds to step S56 to generate a charging instruction based on the charging voltage. When it is determined that the maximum DC converter setting voltage is the charging voltage, the charging instruction can be sent to the CDDU and the power battery management system (Battery Management System, BMS), respectively, so that the CDDU and the BMS respond to the charging instruction and both output the maximum DC converter setting voltage, so that the power battery and the storage battery can store a large amount of electrical energy in a short time, realize energy recovery with high efficiency, ensure the high efficiency of energy recovery, and thus achieve the purpose of energy saving.

[0135] Step S56: controlling the charge and discharge assembly to charge the battery according to the charging voltage.

[0136] The present application can periodically execute the current charging process. Specifically, the embodiment of the present application can periodically execute steps S21 to S23. After each execution of step S23, the charging amount of that time can be recorded to determine whether the battery can support the next charging demand before the next execution of step S21. When the battery cannot support the next charging demand, the battery is fully charged first, thereby ensuring that the battery will not be excessively consumed during the periodic charging process, and replenishing the battery status in time, so that the charging process will not cause power loss due to insufficient battery SOC and other reasons.

[0137] The current charging process is described as being executed from the nth to the n+1th time. The nth execution of the current charging process includes the following steps:

[0138] K10: Based on the cumulative charge and discharge amount of the battery from the last full charge to the nth charge, it is determined that the battery does not need to be fully charged for the nth charge.

[0139] K11: Obtaining an adjustment strategy for the battery charging voltage according to a magnitude relationship between the first state of charge of the battery and the target ideal state of charge of the battery.

[0140] K12: Adjust the initial charging voltage corresponding to the current temperature according to the adjustment strategy to obtain a charging voltage.

[0141] K13: Record the amount of electricity charged to the battery for the nth time.

[0142] The n+1th execution of the current charging process includes the following steps:

[0143] K20: Collects the total discharge amount of the battery after the charging process from the n+1-ith time to the nth time; i is the number of charging times from the last time the battery was fully charged or the first time it was powered on to the nth time.

[0144] For example, a counter can be set to reset to zero after the battery is last fully charged or powered on for the first time, and incremented by 1 each time the battery is charged. Assuming the battery is charged four times from the last full charge or the first time to the nth charge, the total discharge amount after each charge from the first to the fourth charge is collected. The remaining battery capacity detected during two consecutive battery charges can be calculated to obtain the battery discharge capacity after a charging process, or the battery output power can be directly collected to obtain the battery discharge capacity after a charging process, and then the discharge amounts from the first to the fourth charge can be accumulated to obtain the total discharge amount.

[0145] K21: Accumulate the charging power recorded in each charging process from the n+1-ith time to the nth time to obtain the total charging power.

[0146] K22: Determine the relationship between the sum of the total charge and discharge amounts and a preset multiple of the battery capacity, and determine whether to proceed to step K23. If the sum of the total discharge and charge amounts is less than the preset multiple of the battery capacity, proceed to step K23. If the sum of the total discharge and charge amounts is greater than the preset multiple of the battery capacity, or if the sum of the total discharge and charge amounts is equal to the preset multiple of the battery capacity, proceed to step K24.

[0147] K23: Obtaining an adjustment strategy for the battery charging voltage according to a magnitude relationship between the first state of charge of the battery and the target ideal state of charge of the battery.

[0148] K24: The preset voltage for fully charging the battery is used as the charging voltage; and the n+1 charging processes executed are recorded as the latest full charge.

[0149] For example, after fully charging the battery, the controller resets the preset counter.

[0150] The embodiment of the present application also describes the implementation method of executing step K24. Fully charging the battery can be achieved by requesting the SOC setting voltage to charge the battery. The controller generates an instruction to charge the battery according to the SOC setting voltage and sends it to the CDDU. The CDDU responds to the instruction and outputs the SOC setting voltage to the battery.

[0151] The SOC setting voltage can be a pre-calibrated voltage corresponding to different SOCs. For example, to test the effect of ambient temperature on the battery, the SOC setting voltage is calibrated to obtain a set {Q1-X1V, Q2-X2V, ... Q C -X C V}, where Q1-X1V means when the battery SOC is Q1, the SOC setting voltage is X1.

[0152] The current charging process is described as being performed from the n+1th to the n+2th time. In the periodic charging process, if the battery is fully charged according to the preset voltage for fully charging the battery during the n+1th charging process, and the battery is fully charged according to the preset voltage for fully charging the battery during the n+1th charging process, the method further includes:

[0153] monitoring a first state of charge or a charging current of the battery within a preset time period;

[0154] During the (n+2)th charging process, obtaining an adjustment strategy for the battery charging voltage according to a relationship between the first state of charge of the battery and the target ideal state of charge of the battery includes:

[0155] When the first state of charge of the battery is greater than a state of charge threshold within a preset time period, or the charging current of the battery is less than a current threshold within a preset time period, an adjustment strategy for the battery charging voltage is obtained based on the relationship between the first state of charge of the battery and the target ideal state of charge of the battery.

[0156] Therefore, the implementation method of executing step K24 can be: K241 monitors the first charge state or charging current of the battery within a preset time period, and determines whether the current charge completes the full charging of the battery based on the first charge state or charging current of the battery within the preset time period. If the current charge completes the full charging of the battery, execute step K242; if the current charge does not complete the full charging of the battery, execute step K243.

[0157] If it is detected that the first state of charge of the battery within the preset time period is greater than the charge state threshold, or the charging current is detected to be less than the current threshold; for example, the charge state threshold may be 95%, and the current threshold may be 0.5A, if it is detected that the SOC of the battery within the preset time period is greater than 95%, or the charging current is detected to be less than 0.5A, it is determined that the current charging completes the full charge of the battery, and the execution of the n+1 charging process is recorded as the latest full charge.

[0158] If it is detected that the first charge state of the battery within the preset time period is less than the charge state threshold, or if it is detected that the charging current is greater than the current threshold, it is determined that the current charge has not completed the full charge of the battery, and the battery continues to be charged according to the SOC set voltage.

[0159] K242: Obtain an adjustment strategy for the battery charging voltage based on a magnitude relationship between the first state of charge of the battery and the target ideal state of charge of the battery.

[0160] K243: Fully charge the battery according to the preset voltage for fully charging the battery as the charging voltage.

[0161] An example of the present application provides a process in which the controller periodically calculates the charging voltage based on multiple parameters. Figure 5 is a schematic diagram of the charging system application scenario structure shown in an example of the present application. As shown in Figure 5, the controller t is connected to the IBS and CDDU through the PCAN line, and can also be connected to the BMS; the PCAN line is connected to the gateway, and can interact with the TBOX information through the TCAN line, the vehicle-mounted remote communication terminal (Telematics BOX, TBOX), and the IBC information through the BACN line, and integrate brake control (Incorporated Brake Control, IBC).

[0162] The controller receives battery parameters collected by the IBS; for example, battery parameters may include battery voltage, voltage state, current measurement range, current, current state, temperature, temperature state, SOC, SOH, calibration fault indication, battery fault indication, IBS_LIN communication fault indication, battery inconsistency indicator, etc.; the BMS can upload relevant parameters of the power battery, for example, relevant parameters of the power battery may include power battery SOC, power battery power, etc.; the controller determines the charging voltage of the battery based on the above parameters.

[0163] FIG6 is a flow chart of an exemplary controller for determining a charging voltage according to the present application. As shown in FIG6 , the process of determining a charging voltage includes:

[0164] M11: Determine the IBS status based on parameters such as battery voltage, battery current, battery temperature, battery SOC, battery fault indication, and IBS_LIN communication fault indication. If the IBS status is abnormal, it means that the IBS cannot correctly collect relevant parameters, and execute M12. If the IBS status is normal, execute M13.

[0165] M12: Determine the temperature setting voltage corresponding to the current ambient temperature as the charging voltage.

[0166] The temperature setting voltage can be a pre-calibrated voltage corresponding to different ambient temperatures. For example, to test the effect of ambient temperature on the battery, the temperature setting voltage is calibrated to obtain a set {T1-U1V, T2-U2V, ... T C -U C V}, where T1-U1V means that when the ambient temperature is T1, the temperature setting voltage is U1.

[0167] M13: Determine whether the energy recovery state is on. If the energy recovery state is on, it means that energy recovery is currently possible, and execute M14; if the energy recovery state is off, execute M18.

[0168] M14: Determine whether the power battery SOC is greater than the set value. If so, determine that the power battery supports energy recovery, and use the maximum DC converter setting voltage as the charging voltage; or determine whether the power battery charging power supports energy recovery. If the battery charging power supports energy recovery, use the maximum DC converter setting voltage as the charging voltage; if the battery charging power does not support energy recovery and the power battery SOC is less than the set value, execute M15.

[0169] M15: Determine whether the battery has reached the full charge condition based on the relationship between the sum of the total battery charge and discharge after the last full charge and the preset multiple of the battery capacity; the controller records it after each full charge; if the battery has reached the full charge condition, execute M16 to M17; if the battery has not reached the full charge condition, execute M18.

[0170] M16: Set the SOC setting voltage corresponding to the current SOC of the battery as the charging voltage, fully charge the battery, and determine whether the battery is fully charged after charging by executing M17; if the battery is fully charged, record the current charge as the latest full charge to provide a basis for determining whether to execute M16 during the next charging process; if the battery is not fully charged, continue to set the SOC setting voltage as the charging voltage to fully charge the battery.

[0171] M17: Detect the battery charging process. If the battery SOC is detected to be greater than 95% or the charging current is detected to be less than 0.5A within 1 minute in the battery charging record, it is determined that the battery is fully charged.

[0172] M18: Obtaining an adjustment strategy for the battery charging voltage based on a relationship between the first state of charge of the battery and the target ideal state of charge of the battery, and adjusting the initial charging voltage corresponding to the current temperature according to the adjustment strategy to obtain a charging voltage.

[0173] FIG7 is a functional module diagram of a charging device proposed in an embodiment of the present application. The charging device is provided in a controller of the charging system shown in FIG1 . As shown in FIG7 , the device includes:

[0174] a comparison module 71 configured to obtain an adjustment strategy for the battery charging voltage based on a relationship between the first state of charge of the battery and the target ideal state of charge of the battery; the adjustment strategy is to reduce the voltage requirement corresponding to the next charge by increasing the charge requirement of the next acquisition, or to reduce the voltage requirement corresponding to the current charge;

[0175] An adjustment module 72, configured to adjust the initial charging voltage corresponding to the current temperature according to the adjustment strategy to obtain a charging voltage;

[0176] The control module 73 is used to control the charge and discharge assembly to charge the battery according to the charging voltage.

[0177] The charging device provided in the embodiment shown in FIG7 can be used to implement the technical solutions of the method embodiments shown in FIG1 to FIG6 of this specification. Its implementation principles and technical effects can be further referred to the relevant descriptions in the method embodiments.

[0178] Optionally, the comparison module includes:

[0179] a calculation submodule, configured to calculate a difference between an actual state of charge of the first state of charge and the target ideal state of charge;

[0180] A search submodule, configured to search for a target compensation voltage corresponding to the actual charge difference in a pre-calibrated correspondence between the charge state difference and the compensation voltage;

[0181] The first comparison submodule is configured to obtain, when the first state of charge is less than the target ideal state of charge, an initial charging voltage corresponding to the current temperature superimposed on the target compensation voltage as the adjustment strategy.

[0182] The second comparison submodule is configured to obtain, when the first state of charge is greater than the target ideal state of charge, an initial charging voltage corresponding to the current temperature minus the target compensation voltage as the adjustment strategy.

[0183] The third comparison submodule is configured to obtain, when the first state of charge is equal to the target ideal state of charge, an initial charging voltage corresponding to the current temperature as the adjustment strategy.

[0184] Optionally, the device further comprises:

[0185] A first acquisition module is used to acquire the current battery health factor of the battery;

[0186] A first search module is configured to search for a target voltage compensation coefficient corresponding to the current battery health coefficient in a pre-calibrated correspondence between battery health coefficients and voltage compensation coefficients;

[0187] The adjustment module is specifically configured to adjust the initial charging voltage corresponding to the current temperature according to the adjustment strategy and the target voltage compensation coefficient to obtain a charging voltage.

[0188] Optionally, the device further comprises:

[0189] The second acquisition module is used to collect the energy recovery state, the second charge state of the power battery and the power battery power;

[0190] The comparison module is specifically used to obtain an adjustment strategy for the battery charging voltage according to a size relationship between the first charge state of the battery and the target ideal charge state of the battery when the energy recovery state of the power battery is in an off mode and the second charge state and the power battery power do not support energy recovery of the power battery.

[0191] Optionally, the device further comprises:

[0192] The maximum voltage setting module is used to determine the maximum DC converter setting voltage as the charging voltage when the energy recovery state of the power battery is in the on mode and the second charge state and the power battery power support energy recovery of the power battery.

[0193] Optionally, the device further comprises:

[0194] a third acquisition module, configured to acquire the first state of charge and current temperature of the battery;

[0195] a second search module, configured to search for the target ideal state of charge corresponding to the current temperature in a pre-calibrated correspondence between battery temperature and ideal state of charge;

[0196] The third search module is configured to search for the initial charging voltage corresponding to the current temperature in a pre-calibrated correspondence between the battery temperature and the initial charging voltage.

[0197] The device further comprises:

[0198] A recording module, configured to record the amount of electricity charged to the battery for the nth time during the periodic charging process;

[0199] a fourth acquisition module, configured to acquire, before obtaining an adjustment strategy for the battery charging voltage for the n+1th time based on a relationship between the first state of charge of the battery and a target ideal state of charge of the battery, a total discharge amount of the battery from the n+1th to the nth charging process, where i is the number of charging times between the last full charge or initial power-on of the battery and the nth charging process;

[0200] an accumulation module, configured to accumulate the charging power recorded in each charging process from the (n+1-i)th to the (n)th charging process before obtaining an adjustment strategy for the battery charging voltage according to a relationship between the first state of charge of the battery and a target ideal state of charge of the battery for the (n+1)th time to obtain a total charging amount;

[0201] The comparison module is specifically used to obtain the adjustment strategy for the battery charging voltage based on the relationship between the first charge state of the battery and the target ideal charge state of the battery for the (n+1)th time during the periodic charging process. The comparison module is specifically used to obtain the adjustment strategy for the battery charging voltage based on the relationship between the first charge state of the battery and the target ideal charge state of the battery when the sum of the total discharge amount and the total charge amount is less than a preset multiple of the battery capacity.

[0202] Optionally, the device also includes a full charging module, which is used to, during the periodic charging process, when the sum of the total discharge amount and the total charge amount is greater than or equal to a preset multiple of the battery capacity, use the preset voltage for fully charging the battery as the charging voltage; and record the execution of n+1 charging processes as the latest full charge.

[0203] Optionally, the device further comprises:

[0204] a monitoring module, configured to monitor a first state of charge or a charging current of the battery within a preset time period each time a full charging operation is performed on the battery during a periodic charging process;

[0205] The comparison module, when performing the operation of obtaining the adjustment strategy for the battery charging voltage for the n+2th time, is specifically used to obtain the adjustment strategy for the battery charging voltage according to the relationship between the first charge state of the battery and the target ideal charge state of the battery when the charging process is fully charged for the n+1th time and the charging process is fully charged for the n+1th time, and the first charge state of the battery is greater than the charge state threshold within a preset time period, or the charging current of the battery is less than the current threshold within the preset time period.

[0206] The device provided in the above-mentioned embodiment is used to execute the technical solution of the above-mentioned method embodiment. Its implementation principle and technical effects can be further referred to the relevant description in the method embodiment, which will not be repeated here.

[0207] The device provided in the above embodiment can be, for example, a chip or a chip module. The device provided in the above embodiment is used to implement the technical solution of the above method embodiment. Its implementation principle and technical effects can be further referred to the relevant description in the method embodiment, which will not be repeated here.

[0208] Regarding the various modules / units contained in the various devices described in the above embodiments, they can be software modules / units, hardware modules / units, or part of them can be software modules / units and part of them can be hardware modules / units. For example, for various devices applied to or integrated in a chip, the various modules / units contained therein can all be implemented in the form of hardware such as circuits, or at least part of the modules / units can be implemented in the form of software programs, which run on the processor integrated inside the chip, and the remaining modules / units can be implemented in the form of hardware such as circuits; for various devices applied to or integrated in a chip module, the various modules / units contained therein can all be implemented in the form of hardware such as circuits, and different modules / units can be located in the same component of the chip module (such as a chip, circuit module, etc.) or in different components, or at least part of the modules / units can be implemented in the form of software programs. The software program is implemented in the form of a program, which runs on the processor integrated in the chip module, and the remaining modules / units can be implemented in the form of hardware such as circuits; for each device applied to or integrated in the electronic terminal equipment, the various modules / units contained therein can be implemented in the form of hardware such as circuits, and different modules / units can be located in the same component (for example, a chip, circuit module, etc.) or different components in the electronic terminal equipment, or at least some modules / units can be implemented in the form of a software program, which runs on the processor integrated in the electronic terminal equipment, and the remaining (if any) modules / units can be implemented in the form of hardware such as circuits.

[0209] Figure 8 is a structural diagram of a controller provided in an embodiment of the present application. The electronic device 800 includes a processor 810, a memory 811, and a computer program stored in the memory 811 and executable on the processor 810. When the processor 810 executes the program, the steps in the aforementioned method embodiment are implemented. The controller provided in the embodiment can be used to execute the technical solution of the method embodiment shown above. The implementation principle and technical effects thereof can be further referred to the relevant description in the method embodiment, which will not be repeated here.

[0210] An embodiment of the present application provides a computer-readable storage medium that stores computer instructions that cause the computer to execute the charging method provided in the embodiments shown in Figures 1 to 6 of this specification. The computer-readable storage medium may be a non-volatile computer storage medium.

[0211] The above-mentioned computer-readable storage medium can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM) or flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, device or device.

[0212] A computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal may take a variety of forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0213] Program code embodied on a computer-readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, radio frequency (RF), etc., or any suitable combination of the foregoing.

[0214] Computer program code for performing the operations of this specification may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0215] The foregoing description of this specification describes specific embodiments. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0216] In the description of the embodiments of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this specification. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0217] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout this specification, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0218] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of this specification includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of this specification belong.

[0219] The word "if," as used herein, may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0220] It should be noted that the terminals involved in the embodiments of the present application may include but are not limited to personal computers (PCs), personal digital assistants (PDAs), wireless handheld devices, tablet computers, mobile phones, MP3 players, MP4 players, etc.

[0221] In the several embodiments provided in this specification, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be through some interface, indirect coupling or communication connection of devices or units, which may be electrical, mechanical or other forms.

[0222] In addition, the functional units in the various embodiments of this specification may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or hardware plus software functional units.

[0223] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor to perform some steps of the method described in various embodiments of this specification. The aforementioned storage medium includes: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc., various media that can store program code.

[0224] The above description is only a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.

Claims

1. A charging method, characterized in that: Applied to the controller, the method for executing the current charging process includes: According to the relationship between the first charge state of the battery and the target ideal charge state of the battery, an adjustment strategy for the charging voltage of the battery is obtained; the adjustment strategy is to reduce the voltage requirement corresponding to the next charge by increasing the charge state collected next time, or to reduce the voltage requirement corresponding to the current charge; The initial charging voltage corresponding to the current temperature is adjusted according to the adjustment strategy to obtain a charging voltage; The charging and discharging assembly is controlled to charge the battery according to the charging voltage.

2. The method according to claim 1, characterized in that Obtaining a voltage adjustment strategy according to a magnitude relationship between the first charge state and the target ideal charge state includes: Calculating a difference between the first state of charge and the target ideal state of charge; Searching for a target compensation voltage corresponding to the actual charge difference in a pre-calibrated correspondence relationship between a charge state difference and a compensation voltage; When the first state of charge is less than the target ideal state of charge, the initial charging voltage corresponding to the current temperature superimposed on the target compensation voltage is obtained as the adjustment strategy.

3. The method according to claim 1, characterized in that: Obtaining a voltage adjustment strategy according to a magnitude relationship between the first charge state and the target ideal charge state includes: Calculating a difference between the first state of charge and the target ideal state of charge; Searching for a target compensation voltage corresponding to the actual charge difference in a pre-calibrated correspondence relationship between a charge state difference and a compensation voltage; When the first state of charge is greater than the target ideal state of charge, obtaining an initial charging voltage corresponding to the current temperature minus the target compensation voltage as the adjustment strategy; When the first state of charge is equal to the target ideal state of charge, maintaining the initial charging voltage corresponding to the current temperature is obtained as the adjustment strategy.

4. The method according to claim 1, characterized in that: The method further comprises: Collecting the current battery health factor of the battery; Searching for a target voltage compensation coefficient corresponding to the current battery health coefficient in a pre-calibrated correspondence relationship between a battery health coefficient and a voltage compensation coefficient; The initial charging voltage corresponding to the current temperature is adjusted according to the adjustment strategy to obtain the charging voltage, including: The initial charging voltage corresponding to the current temperature is adjusted according to the adjustment strategy and the target voltage compensation coefficient to obtain a charging voltage.

5. The method according to claim 1, characterized in that The method further comprises: Collecting energy recovery status, the second charge state of the power battery, and the power battery power; According to the magnitude relationship between the first state of charge of the battery and the target ideal state of charge of the battery, an adjustment strategy for the charging voltage of the battery is obtained, including: When the energy recovery state of the power battery is in the off mode, and the second charge state and the power battery power do not support energy recovery of the power battery, an adjustment strategy for the battery charging voltage is obtained according to the relationship between the first charge state of the battery and the target ideal charge state of the battery.

6. The method according to claim 5, characterized in that The method further comprises: When the energy recovery state of the power battery is in the on mode, and the second charge state and the power battery power support the energy recovery of the power battery, the maximum DC converter setting voltage is determined to be the charging voltage.

7. The method according to claim 1, characterized in that The method further comprises: collecting the first charge state and current temperature of the battery; Searching for the target ideal state of charge corresponding to the current temperature in a pre-calibrated correspondence relationship between battery temperature and ideal state of charge; The initial charging voltage corresponding to the current temperature is searched in the pre-calibrated corresponding relationship between the battery temperature and the initial charging voltage.

8. The method according to claim 1, characterized in that In the periodic charging process, after the charging and discharging assembly is controlled to charge the battery according to the charging voltage for the nth time, the method further includes: Recording the charging quantity of the battery for the nth time; Before obtaining the adjustment strategy for the charging voltage of the battery according to the magnitude relationship between the first state of charge of the battery and the target ideal state of charge of the battery for the n+1th time, the method further includes: Collect the total discharge amount of the battery after the charging process from the n+1-ith time to the nth time; i is the number of charging times from the last time the battery was fully charged or charged for the first time to the nth time; Accumulate the charging power recorded in each charging process from the n+1-ith time to the nth time to obtain the total charging power; The (n+1)th time, according to the magnitude relationship between the first charge state of the battery and the target ideal charge state of the battery, an adjustment strategy for the charging voltage of the battery is obtained, including: When the sum of the total discharge amount and the total charge amount is less than a preset multiple of the battery capacity, an adjustment strategy for the battery charging voltage is obtained according to a magnitude relationship between the first charge state of the battery and the target ideal charge state of the battery.

9. The method according to claim 8, characterized in that When the sum of the total discharge amount and the total charge amount is greater than or equal to a preset multiple of the battery capacity, a preset voltage for fully charging the battery is used as the charging voltage; The n+1 charging process is recorded as the latest full charge.

10. The method according to claim 9, characterized in that In the periodic charging process, if the battery is fully charged according to the preset voltage for fully charging the battery as the charging voltage during the n+1th charging process, and the battery is fully charged, after the preset voltage for fully charging the battery is used as the charging voltage during the n+1th charging process, the method further includes: Monitoring a first state of charge or a charging current of the battery within a preset time period; In the n+2th charging process, according to the magnitude relationship between the first charge state of the battery and the target ideal charge state of the battery, an adjustment strategy for the charging voltage of the battery is obtained, including: When the first charge state of the battery within a preset time period is greater than a charge state threshold, or the charging current of the battery within a preset time period is less than a current threshold, an adjustment strategy for the battery charging voltage is obtained based on the relationship between the first charge state of the battery and the target ideal charge state of the battery.

11. A charging device, characterized in that: Set in the controller, the device includes: The comparison module is used to obtain an adjustment strategy for the battery charging voltage according to the size relationship between the first charge state of the battery and the target ideal charge state of the battery; the adjustment strategy is to increase the charge voltage of the next collected charge. The load state reduces the voltage requirement for the next charge, or reduces the voltage requirement for the current charge; An adjustment module, used for adjusting the initial charging voltage corresponding to the current temperature according to the adjustment strategy to obtain a charging voltage; The control module is used to control the charge and discharge assembly to charge the battery according to the charging voltage.

12. A charging system, characterized in that: The charging system includes a battery DC sensor, a charging and discharging assembly, a controller and a battery; wherein, The battery DC sensor is used to collect a first charge state of the battery; The controller is used to obtain an adjustment strategy for the battery charging voltage according to the relationship between the first charge state of the battery and the target ideal charge state of the battery; adjust the initial charging voltage corresponding to the current temperature according to the adjustment strategy to obtain the charging voltage; and issue instructions to the charging and discharging assembly according to the charging voltage; The charging and discharging assembly is used to charge the battery in response to instructions sent by the vehicle controller.

13. A controller comprising: at least one processor; as well as At least one memory in communication with the processor, characterized in that: The memory stores program instructions executable by the processor, and the processor can execute the method according to any one of claims 1 to 11 by calling the program instructions.

14. A computer-readable storage medium storing computer instructions, characterized in that: The computer instructions enable the computer to execute the method according to any one of claims 1 to 11.

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