Charging control method and device and vehicle

Abstract

The invention relates to a charging control method, and the method comprises the steps: querying a corresponding first charging request current and a first clamping voltage according to the temperature information, the remaining electric quantity and the maximum monomer voltage of a battery monomer at the current moment, setting a voltage adjustment threshold value according to the first clamping voltage, and controlling the charging of the battery when the monomer voltage is monitored to be greater than or equal to the voltage adjustment threshold value. And the derating amount of the charging request current is determined according to the voltage adjusting threshold value and the first clamping voltage, a second charging request current is obtained through calculation according to the first charging request current and the derating amount, and the second charging request current is sent to the charging pile. Taking the maximum single battery voltage as an adjusting target, adjusting a second charging request current for the charging pile in the battery charging process, and by setting a voltage adjusting threshold value, performing derating adjustment on the charging request current when the single battery voltage does not reach a voltage clamping point; the step problem of request multiplying power jump caused by voltage clamping is solved, the battery charging capacity is improved, and the charging remaining time is shortened.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a charging control method, device and vehicle. Background Art

[0002] In the related art, as the battery is charged, the single cell voltage of each battery cell tends to rise. Within a certain charge margin (State of Charge, SoC) and temperature range, when the voltage reaches a certain clamping voltage threshold, the charging request current will be limited by the allowable charging current value corresponding to the clamping voltage threshold. If the battery's allowable charging current is greater than the current limit threshold corresponding to the clamping voltage threshold, the battery's allowable charging current must immediately drop to the current limit threshold. Correspondingly, the charging request current sent by the battery management system (Battery Management System, BMS) to the charging pile will also drop suddenly, so that the output current of the charging pile drops suddenly to ensure that the actual charging current does not exceed the new allowable charging current upper limit.

[0003] However, if the clamping voltage threshold is set too conservatively, the charging request current will continue to step down when the new voltage clamping point is continuously reached during the entire battery charging process. The actual charging current entering the battery pack during charging will not be smooth, which will affect the battery's charging capacity and increase the remaining charging time. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present disclosure provides a charging control method, device and vehicle.

[0005] According to a first aspect of an embodiment of the present disclosure, there is provided a charging control method, comprising:

[0006] According to the current temperature information, remaining power and maximum cell voltage of the battery cell, query the corresponding first charging request current and first clamping voltage;

[0007] Setting a voltage regulation threshold according to the first clamping voltage, wherein the voltage regulation threshold is less than the first clamping voltage;

[0008] When it is monitored that the cell voltage is greater than or equal to the voltage regulation threshold, determining a derating amount of the charging request current according to the voltage regulation threshold and the first clamping voltage;

[0009] A second charging request current is calculated according to the first charging request current and the derating amount, and the second charging request current is sent to the charging pile.

[0010] In some embodiments, determining the derating amount of the charging request current according to the voltage regulation threshold and the first clamping voltage includes:

[0011] The PI control is started, and the voltage regulation threshold and the first clamping voltage are calculated based on the PI control to obtain a derating amount of the charging request current.

[0012] In some embodiments, the calculating the voltage regulation threshold and the first clamping voltage based on the PI control to obtain the derating amount of the charging request current includes:

[0013] Calculating the difference between the maximum single cell voltage of the battery and the voltage regulation threshold to obtain a difference result;

[0014] According to the product of the calibration proportional coefficient and the difference result, the proportional derating is obtained;

[0015] Calculate the step-length accumulation of the difference result;

[0016] The integrated power derating is obtained by multiplying the calibrated integral coefficient by the accumulated step length;

[0017] The derating amount of the charging request current is obtained according to the sum of the integrated power derating and the proportional derating.

[0018] In some embodiments, the calculating the second charging request current according to the first charging request current and the derating amount includes:

[0019] The difference between the first charging request current and the derating amount is calculated to obtain the second charging request current.

[0020] In some embodiments, querying the corresponding first charging request current and first clamping voltage according to the current temperature information, remaining power and maximum cell voltage of the battery cell includes:

[0021] Query the current temperature information and the charging request rate corresponding to the remaining power in the preset fast charging rate table;

[0022] converting the charging request rate into the first charging request current;

[0023] The first clamping voltage corresponding to the current remaining power and the maximum single cell voltage is queried in the preset fast charge rate table.

[0024] In some embodiments, after sending the second charging request current to the charging pile, the method further includes:

[0025] Determining whether the second charging request current is less than a first clamping current, wherein the first clamping current is calculated according to the first clamping voltage and a corresponding clamping ratio;

[0026] If it is determined that the second charging request current is less than the first clamping current, turning off the PI control;

[0027] The second charging request current is determined as the first clamping current at a current moment.

[0028] In some embodiments, after starting the PI control, the method further includes:

[0029] Determine whether the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is that the charging pile is abnormal;

[0030] When it is determined that the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is that the charging pile is abnormal, the PI control is turned off.

[0031] In some embodiments, after turning off the PI control, the method further includes:

[0032] After determining that the remaining power of the battery reaches the first threshold, querying the third charging request current and the second clamping voltage again according to the temperature information, the remaining power and the maximum cell voltage of the battery cell;

[0033] If the third charging request current is less than the first clamping current, controlling to end clamping based on the first clamping voltage and start clamping based on the second clamping voltage;

[0034] The first clamping current is determined as a second charging request current.

[0035] In some embodiments, after starting the PI control, the method further includes:

[0036] Determine whether the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is that the temperature of the battery rises, different temperature intervals correspond to different first clamping voltages, and the temperature of the temperature interval is positively correlated with the clamping voltage;

[0037] If it is determined that the reason why the maximum single-cell voltage of the battery is higher than the first clamping voltage is due to a temperature rise of the battery, the PI control is turned off.

[0038] In some embodiments, setting the voltage regulation threshold according to the first clamping voltage includes:

[0039] setting a voltage margin according to the accuracy of the first clamping voltage;

[0040] The voltage regulation threshold is set according to a difference between the first clamping voltage and the voltage margin.

[0041] According to a second aspect of an embodiment of the present disclosure, there is provided a charging control device, comprising:

[0042] A query unit, used to query the corresponding first charging request current and first clamping voltage according to the current temperature information, remaining power and maximum cell voltage of the battery cell;

[0043] a setting unit, configured to set a voltage adjustment threshold according to the first clamping voltage, wherein the voltage adjustment threshold is less than the first clamping voltage;

[0044] a first determining unit, configured to determine a derating amount of a charging request current according to the voltage regulation threshold and the first clamping voltage when monitoring that a cell voltage is greater than or equal to the voltage regulation threshold;

[0045] a calculation unit, configured to calculate a second charging request current according to the first charging request current and the derating amount;

[0046] A sending unit is used to send the second charging request current to the charging pile.

[0047] In some embodiments, the first determining unit includes:

[0048] Startup module, used to start PI control;

[0049] A calculation module is used to calculate the voltage regulation threshold and the first clamping voltage based on the PI control to obtain a derating amount of the charging request current.

[0050] In some embodiments, the computing module is further configured to:

[0051] Calculating the difference between the maximum single cell voltage of the battery and the voltage regulation threshold to obtain a difference result;

[0052] According to the product of the calibration proportional coefficient and the difference result, the proportional derating is obtained;

[0053] Calculate the step-length accumulation of the difference result;

[0054] The integrated power derating is obtained by multiplying the calibrated integral coefficient by the accumulated step length;

[0055] The derating amount of the charging request current is obtained according to the sum of the integrated power derating and the proportional derating.

[0056] In some embodiments, the calculation unit is further configured to calculate a difference between the first charging request current and the derating amount to obtain the second charging request current.

[0057] In some embodiments, the query unit is further configured to:

[0058] Query the current temperature information and the charging request rate corresponding to the remaining power in the preset fast charging rate table;

[0059] converting the charging request rate into the first charging request current;

[0060] The first clamping voltage corresponding to the current remaining power and the maximum single cell voltage is queried in the preset fast charge rate table.

[0061] In some embodiments, the apparatus further comprises:

[0062] The judging unit is further configured to judge whether the second charging request current is less than a first clamping current after the sending unit sends the second charging request current to the charging pile, wherein the first clamping current is calculated according to the first clamping voltage and a corresponding clamping ratio;

[0063] a control unit, configured to turn off the PI control when it is determined that the second charging request current is less than the first clamping current;

[0064] The second determining unit is configured to determine the second charging request current as the first clamping current at a current moment.

[0065] In some embodiments, the apparatus further comprises:

[0066] A third determination unit is used to determine whether the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is that the charging pile is abnormal after starting the PI control;

[0067] The control unit is further configured to shut down the PI control when it is determined that the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is that the charging pile is abnormal.

[0068] In some embodiments, the apparatus further comprises:

[0069] The query unit is further configured to query the third charging request current and the second clamping voltage again according to the temperature information, the remaining power and the maximum cell voltage of the battery cell after the control unit turns off the PI control and after determining that the remaining power of the battery reaches the first threshold;

[0070] The control unit is further configured to control to end clamping based on the first clamping voltage and start clamping based on the second clamping voltage if the third charging request current is less than the first clamping current;

[0071] The fourth determining unit is configured to determine the first clamping current as a second charging request current.

[0072] In some embodiments, the apparatus further comprises:

[0073] a fifth determining unit, configured to determine, after starting the PI control, whether the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is a temperature rise of the battery, different temperature intervals correspond to different first clamping voltages, and the temperature of the temperature interval is positively correlated with the clamping voltage;

[0074] The control unit is further configured to shut down the PI control when it is determined that the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is due to a rise in the temperature of the battery.

[0075] In some embodiments, the setting unit is further configured to:

[0076] setting a voltage margin according to the accuracy of the first clamping voltage;

[0077] The voltage regulation threshold is set according to a difference between the first clamping voltage and the voltage margin.

[0078] According to a third aspect of an embodiment of the present disclosure, a vehicle is provided, comprising:

[0079] processor;

[0080] a memory for storing processor-executable instructions;

[0081] Wherein, the processor is used for:

[0082] Implement any one of the methods described in the first aspect.

[0083] According to a fourth aspect of an embodiment of the present disclosure, a non-temporary computer-readable storage medium is provided. When instructions in the storage medium are executed by a processor of a mobile terminal, the mobile terminal is enabled to execute a method as described in any one of the first aspects.

[0084] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0085] First, according to the temperature information, remaining power and maximum cell voltage of the battery cell at the current moment, the corresponding first charging request current and the first clamping voltage are queried. Secondly, a voltage adjustment threshold is set according to the first clamping voltage, wherein the voltage adjustment threshold is less than the first clamping voltage, and when it is detected that the cell voltage is greater than or equal to the voltage adjustment threshold, the derating amount of the charging request current is determined according to the voltage adjustment threshold and the first clamping voltage. Finally, the second charging request current is calculated according to the first charging request current and the derating amount, and the second charging request current is sent to the charging pile. The disclosed embodiment takes the battery cell voltage as the adjustment target, adjusts the second charging request current of the charging pile during the battery charging process, and by setting the voltage adjustment threshold, the charging request current is derating when the battery cell voltage does not reach the voltage clamping point, thereby solving the step problem caused by the voltage clamping causing the request rate to jump down, improving the battery charging capacity, and reducing the remaining charging time.

[0086] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0088] Figure 1 is a flow chart of a charging control method according to some embodiments of the present disclosure;

[0089] Figure 2 is a schematic diagram of a clamping voltage and a voltage adjustment threshold according to some embodiments of the present disclosure;

[0090] Figure 3 is a flow chart of another charging control method according to some embodiments of the present disclosure;

[0091] Figure 4 is a schematic diagram showing a charging capacity benefit according to some embodiments of the present disclosure;

[0092] Figure 5 is a flow chart of another charging control method according to some embodiments of the present disclosure;

[0093] Figure 6 is a schematic diagram of another charging control method according to some embodiments of the present disclosure;

[0094] Figure 7is a block diagram of a charging control device according to some embodiments of the present disclosure;

[0095] Figure 8 is a block diagram of another charging control device according to some embodiments of the present disclosure;

[0096] Fig. 9 It is a schematic diagram of a functional block diagram of a vehicle showing an exemplary embodiment. DETAILED DESCRIPTION

[0097] Some embodiments of the present disclosure will be described in detail here, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. Various changes, modifications and equivalents of the methods, devices and / or systems described herein will become apparent after understanding the present disclosure. For example, the order of operations described herein is merely an example and is not limited to those orders set forth herein, but can be changed as becomes apparent after understanding the present disclosure, except for operations that must be performed in a specific order. In addition, for clarity and brevity, descriptions of features known in the art may be omitted.

[0098] The embodiments described in some embodiments of the present disclosure below do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0099] In the related art, as the battery is charged, the single cell voltage of each battery cell tends to rise. Within a certain charge margin (State of Charge, SoC) and temperature range, when the voltage reaches a certain clamping voltage threshold, the charging request current will be limited by the allowable charging current value corresponding to the clamping voltage threshold. If the battery's allowable charging current is greater than the current limit threshold corresponding to the clamping voltage threshold, the battery's allowable charging current must immediately drop to the current limit threshold. Correspondingly, the charging request current sent by the battery management system (Battery Management System, BMS) to the charging pile will also drop suddenly, so that the output current of the charging pile drops suddenly to ensure that the actual charging current does not exceed the new allowable charging current upper limit.

[0100] However, if the clamping voltage threshold is set too conservatively, the charging request current will continue to step down when the new voltage clamping point is continuously reached during the entire battery charging process. The actual charging current entering the battery pack during charging will not be smooth, which will affect the battery's charging capacity and increase the remaining charging time.

[0101] In order to solve the above problems, an embodiment of the present disclosure provides a charging control method, which is used in a terminal with a battery charging current request adjustment, such as an electric vehicle, a hybrid vehicle, an electric two-wheeled vehicle and other power density type battery charging current request adjustment terminals.

[0102] like Figure 1 As shown, Figure 1 It is a flow chart of a charging control method shown according to some embodiments of the present disclosure, which includes the following steps.

[0103] In step S101 , the corresponding first charging request current and first clamping voltage are queried according to the current temperature information, the remaining power and the maximum cell voltage of the battery cell.

[0104] In actual applications, as charging continues, the temperature value, remaining power and maximum cell voltage of the battery cell all change dynamically. Therefore, the temperature information, remaining power and maximum cell voltage at different times correspond to different first charging request currents and first clamping voltages. That is, when the charging request current I1 and the clamping voltage V1 are determined by looking up the table at time A, the clamping voltage V1 is used to control the charging request current during this time period. When the charging request current I2 and the clamping voltage V2 are determined by looking up the table at time B, the clamping voltage V2 is used to control the charging request current during the time period including time B.

[0105] During the battery charging process, the temperature information of the battery cell at the current moment (temperature measurement value T cell ) and the remaining power SoC of the single battery, and the corresponding first charging request current is queried by looking up the table. The first charging request current described in the embodiment of the present disclosure is the charging request current I allowed by the charging pile. map .

[0106] The remaining power SoC of the battery cell at the current moment and the maximum cell voltage V cell,max , query the corresponding first clamping voltage V by looking up the table sup,1 .

[0107] It should be noted that the query table is the fast charge rate table provided by the battery supplier. When looking up the table, you only need to enter the temperature measurement value T cell , remaining power SoC and maximum single cell voltage V cell,max It can be used as an input for the fast charging rate table. The forms of the fast charging rate tables provided by different suppliers may differ. The specific embodiments of the present disclosure do not limit the content and form of the fast charging rate table.

[0108] In step S102, a voltage adjustment threshold is set according to the first clamping voltage, wherein the voltage adjustment threshold is smaller than the first clamping voltage.

[0109] Voltage regulation threshold V target,1 Less than the first clamping voltage V sup,1 The purpose is to adjust and control the charging request current in advance before the battery cell voltage reaches the first clamping voltage during the voltage clamping process to prevent the charging request current from jumping down.

[0110] The first clamping voltage V sup,1 For the relationship between the voltage regulation threshold and Figure 2 From the figure, we can clearly see that the voltage regulation threshold V target,1 ( Figure 2 Where V is the voltage regulation target target ) is less than the clamping voltage V sup When the maximum battery cell voltage V cell,max To achieve the voltage regulation target V target After that, the charging request current is adjusted.

[0111] In step S103, when it is monitored that the maximum cell voltage is greater than or equal to the voltage regulation threshold, a derating amount of the charging request current is determined according to the voltage regulation threshold and the first clamping voltage.

[0112] After monitoring the maximum single cell voltage V cell,max Exceeds the voltage regulation threshold V target,1 In the case of, if no adjustment is performed, as the charging continues, the voltage will continue to increase. When the voltage increases to the first clamping voltage V sup,1 After that, it will be limited by the voltage clamp point and cause the charging request current to jump down.

[0113] In order to prevent the charging request current from jumping down, in the embodiment of the present disclosure, when the maximum single cell voltage V is monitored, cell,max Exceeds the voltage regulation threshold V target,1 , the requested current starts to be reduced, which can increase the maximum single cell voltage V cell,max Exceeds the voltage regulation threshold V target,1 Length of time.

[0114] When reducing the charge request current, the voltage adjustment threshold V target,1 With the first clamping voltage V sup,1 Calculate the derating amount of the charging request current △I pi .

[0115] In the specific implementation process, △I can be calculated by any method in the relevant technology pi , the embodiment of the present disclosure has an effect on △I pi The calculation method is not limited.

[0116] In step S104, a second charging request current is calculated according to the first charging request current and the derating amount, and the second charging request current is sent to the charging pile.

[0117] At the first charging request current I map Based on the above, the derating amount △I is adjusted downwards pi Get the second charging request current I req , the second charging request current I req is the requested current of the actual output.

[0118] During the charging process, the second charging request current I req Sent to the charging pile, the charging pile charges according to the second charging request current I req The output current is used to charge the battery.

[0119] It should be noted that Figure 1 The charging control method is a dynamic regulation control method, which will limit the battery through different clamping voltages based on the battery cell voltage, temperature and remaining power until the remaining power of the battery meets the charging end condition. However, when limiting through different clamping voltages, the corresponding regulation control method principles are the same, and the embodiment of the present disclosure will not further explain the regulation control process of different clamping voltages one by one.

[0120] First, according to the temperature information, remaining power and maximum cell voltage of the battery cell at the current moment, the corresponding first charging request current and first clamping voltage are queried. Secondly, a voltage adjustment threshold is set according to the first clamping voltage, wherein the voltage adjustment threshold is less than the first clamping voltage, and when it is detected that the maximum cell voltage is greater than or equal to the voltage adjustment threshold, the derating amount of the charging request current is determined according to the voltage adjustment threshold and the first clamping voltage. Finally, the second charging request current is calculated according to the first charging request current and the derating amount, and the second charging request current is sent to the charging pile. The disclosed embodiment takes the maximum cell voltage of the battery as the adjustment target, adjusts the second charging request current of the charging pile during the battery charging process, and by setting the voltage adjustment threshold, the charging request current is derating when the maximum cell voltage of the battery does not reach the voltage clamping point, thereby solving the step problem caused by the voltage clamping causing the request rate to jump down, improving the battery charging capacity, and reducing the remaining charging time.

[0121] In some embodiments, when the step 103 is executed to determine the derating amount of the charging request current according to the voltage regulation threshold and the first clamping voltage, the PI control is started, and the voltage regulation threshold and the first clamping voltage are calculated based on the PI control to obtain the derating amount of the charging request current. That is, the PI control maintains the maximum single cell voltage V by reducing the charging request current. cell,max No more than the first clamping voltage V sup,1 , the derating amount of the charging request current △I pi This is the derating caused by PI control.

[0122] When calculating the derating amount of the charging request current, the following methods may be used but are not limited to: Figure 3 As shown, including:

[0123] In step S301, the difference between the maximum single cell voltage of the battery and the voltage regulation threshold is calculated to obtain a difference result, and the proportional derating is obtained according to the product of the calibration proportional coefficient and the difference result;

[0124] Proportional derating △I derate,p It can be calculated by the following formula:

[0125] △I derate,p =K p *(V cell,max -V target,n )

[0126] Among them, K p is the calibration scale factor, V cell,max is the maximum single cell voltage, V target,n is the voltage regulation threshold.

[0127] In step S302, the step-length cumulative amount of the difference result is calculated, and the integrated power derating is obtained according to the product of the calibrated integral coefficient and the step-length cumulative amount.

[0128] Integral power derating △I derate,i It can be calculated by the following formula:

[0129] △I derate,i =K I *∑(V cell,max -V target,n )

[0130] Among them, K I is the calibration integral coefficient.

[0131] In step S303, the derating amount of the charging request current is obtained according to the sum of the integrated power derating and the proportional derating.

[0132] Derating amount △Ipi It can be calculated by the following formula:

[0133] △I pi =△I derate,p +△I derate,i

[0134] In some embodiments, after calculating the derating amount ΔI caused by PI control, pi Then, the first charging request current I is calculated map The derating amount △I pi The second charging request current can be obtained by calculating the difference between the two.

[0135] I req =I map –△I pi

[0136] Please continue reading Figure 2 ,Depend on Figure 2 It can be seen that the charging control method described in the embodiment of the present disclosure can avoid the situation where the charging request current suddenly drops due to voltage clamping. The embodiment of the present disclosure can control the change of the charging request current to be smoother. Figure 4 , since there is no voltage clamping, the charging request current jumps down, so Figure 4 The shaded area in the middle represents the additional charging amount benefit. Therefore, when the battery has the same total power, the charging control method described in the embodiment of the present disclosure can reduce the remaining charging time to a certain extent.

[0137] Further, as a detailed description of step 101, Figure 5 As shown, including:

[0138] In step S501, the preset fast charge rate table is searched for the current temperature information and the charging request rate corresponding to the remaining power.

[0139] When the battery is charging, the current battery cell temperature measurement value T cell With the battery cell SoC estimate as input, the preset fast charge rate table provided by the supplier is retrieved to obtain the currently allowed charging request rate.

[0140] In step S502, the charging request ratio is converted into the first charging request current.

[0141] Based on the charging request ratio queried in step S501, the charging request ratio is converted into an allowable first charging request current I map , where the conversion standard between the ratio and the current is given by the supplier.

[0142] In step S503, the first clamping voltage corresponding to the current remaining power and the maximum cell voltage is queried in the preset fast charge rate table.

[0143] The maximum cell voltage V at the current moment cell,max Check the preset fast charge rate table provided by the supplier with the battery cell SoC to obtain the current first clamping voltage value V sup,1 , and the first clamping voltage V sup,1 The corresponding clamping ratio is converted into the current first clamping current I sup,1 .

[0144] Further, as a detailed description of step 102, when setting the voltage regulation threshold according to the first clamping voltage, it can be implemented in the following manners but not limited to, for example: according to the first clamping voltage V sup，1 The accuracy of setting voltage margin V offset , setting the voltage regulation threshold according to a difference between the first clamping voltage and the voltage margin.

[0145] When calculating the voltage regulation threshold, the following formula can be used:

[0146] V target,1 =V sup –V offset

[0147] The voltage margin described in the embodiment of the present disclosure is related to the accuracy of the first clamping voltage. For example, assuming that the first clamping voltage is 4.015V and the accuracy is three decimal places, then when setting the voltage margin, it must be consistent with the accuracy of the first clamping voltage. For example, if the voltage margin is set to 0.002V, the voltage adjustment threshold is 4.015V-0.002V=4.013V. Alternatively, assuming that the first clamping voltage is 10.08V and the accuracy is two decimal places, then when setting the voltage margin, it must be consistent with the accuracy of the first clamping voltage. For example, if the voltage margin is set to 0.01V, the voltage adjustment threshold is 10.08V-0.01V=10.07V, etc. The embodiment of the present disclosure does not limit the first clamping voltage and the voltage margin, and can be set according to the attribute information of different battery types.

[0148] After the PI control is started, the timing of shutting down the PI control needs to be determined according to the real-time status of the battery charging. In the present disclosure, there are the following three scenarios related to the PI control, which are described in detail below:

[0149] Scenario 1: If the output second charging request current I req Less than the first clamping current I sup,1 , then exit PI control.

[0150] After starting the PI control, it is determined that the second charging request current I req Is it less than the first clamping current I sup,1 , wherein the first clamping current I sup,1 According to the first clamping voltage V sup,1 The corresponding clamping ratio is calculated;

[0151] In determining the second charging request current I req is less than the first clamping current I sup,1 In the case of req Determined as the first clamping current I at the current moment sup,1 That is, the battery voltage during the charging process has not yet reached the voltage regulation threshold V target,1 , so no adjustment is required. In this scenario, there is no need to adjust the second charging request current I req The first clamping current I sup,1 .

[0152] Scenario 2: If the maximum single-cell voltage of the battery is higher than the first clamping voltage Vsup,1 due to an abnormality in the charging pile, the PI control is exited.

[0153] After starting the PI control, it is determined whether the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is that the charging pile is abnormal. If it is determined that the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is that the charging pile is abnormal, the PI control is turned off.

[0154] The charging pile abnormality described in the embodiment of the present disclosure includes but is not limited to abnormal problems such as charging pile response lag and jitter. When it is determined that the maximum single cell voltage of the battery is higher than the first clamping voltage due to the abnormality of the charging pile, the PI control is exited and the output second charging request current I req Adjust to the first clamping current I sup,1 .

[0155] As described in the above embodiments, the charging control method of the embodiment of the present disclosure is a dynamic control method, which continues to monitor the charging status of the battery after exiting PI control based on scenario one and scenario two.

[0156] After the battery SoC reaches the first threshold, the maximum cell voltage V cell,max will continue to rise, and then the temperature information T cell , remaining power SoC and maximum single cell voltage V cell,max , query the third charging request current I map,2 and the second clamping voltage V sup,2 .

[0157] If the third charging request current I map,2 is less than the first clamping current I sup,1 , then the control ends based on the first clamping voltage V sup,1 clamping, and starts based on the second clamping voltage V sup,2 The first clamping current I sup,1 Determined as the second charging request current I req , the second requested current I req equal to the first clamping current I sup,1 .

[0158] During the charging process, the cycle is performed Figure 1 The control method shown is continued until the battery charging is completed.

[0159] Scenario 3: If the battery temperature rises and the maximum battery cell voltage is higher than the first clamping voltage V sup,1 , then exit PI control.

[0160] After starting the PI control, determining whether the reason why the maximum battery cell voltage is higher than the first clamping voltage is due to a temperature rise of the battery, and if it is determined that the reason why the maximum battery cell voltage is higher than the first clamping voltage is due to a temperature rise of the battery, shutting down the PI control.

[0161] In the disclosed embodiment, different temperature intervals correspond to different clamping voltages, and the temperature of the temperature interval is positively correlated with the clamping voltage; that is, the higher the temperature, the greater the corresponding clamping voltage.

[0162] As described in the above embodiments, the charging control method of the embodiment of the present disclosure is a dynamic control method, which continues to monitor the charging status of the battery after exiting PI control based on scenario three.

[0163] After the charging control is completed by using the first clamping voltage, the second charging request current I req It can climb at a certain slope to query the next charging request current I in the preset fast charge rate table map At the same time, take the next clamping voltage value (the second clamping voltage V sup,2 ) and its corresponding second clamping current I sup,2 , and set the second voltage regulation target V target,2 .

[0164] If the second charging request current I req Can successfully climb to the next charging request current I map , then return to step 102 to continue the subsequent operation; if the second charging request current I reqNext charge request current I map During the climbing process, the maximum single cell voltage V cell,max has exceeded the second voltage regulation target V target,2 (At this moment, the output request current is I rise ), then the current I rise Based on this, PI control is turned on again to obtain the adjusted output request current I rise , then return to step 104 to continue the subsequent steps.

[0165] I req =I rise –△I pi

[0166] The above process will be repeated until the current charging process is terminated.

[0167] The above embodiment has described in detail the specific implementation process of the charging control method. Figure 6 A schematic diagram of the process for the battery to complete this charging is given. This method can appropriately derating the charging request current during the charging process according to the cell voltage to ensure that the charging request current changes more smoothly without being clamped by the voltage. In addition, it can greatly improve the battery charging capacity and reduce the time required for battery charging.

[0168] Corresponding to the above-mentioned charging control method, the present invention further provides a charging control device. Since the device embodiment of the present invention corresponds to the above-mentioned method embodiment, details not disclosed in the device embodiment can be referred to the above-mentioned method embodiment, and will not be repeated in the present invention.

[0169] Figure 7 is a block diagram of a charging control device according to some embodiments of the present disclosure. Figure 7 The device includes a query unit 71, a setting unit 72, a first determination unit 73, a calculation unit 74 and a sending unit 75.

[0170] A query unit 71, configured to query the corresponding first charging request current and first clamping voltage according to the temperature information, remaining power and maximum cell voltage of the battery cell at the current moment;

[0171] a setting unit 72, configured to set a voltage regulation threshold according to the first clamping voltage, wherein the voltage regulation threshold is less than the first clamping voltage;

[0172] A first determining unit 73 is used to determine a derating amount of a charging request current according to the voltage regulation threshold and the first clamping voltage when it is monitored that the maximum single cell voltage is greater than or equal to the voltage regulation threshold;

[0173] A calculation unit 74, configured to calculate a second charging request current according to the first charging request current and the derating amount;

[0174] The sending unit 75 is used to send the second charging request current to the charging pile.

[0175] First, according to the temperature information, remaining power and maximum cell voltage of the battery cell at the current moment, the corresponding first charging request current and first clamping voltage are queried. Secondly, a voltage adjustment threshold is set according to the first clamping voltage, wherein the voltage adjustment threshold is less than the first clamping voltage, and when it is detected that the maximum cell voltage is greater than or equal to the voltage adjustment threshold, the derating amount of the charging request current is determined according to the voltage adjustment threshold and the first clamping voltage. Finally, the second charging request current is calculated according to the first charging request current and the derating amount, and the second charging request current is sent to the charging pile. The disclosed embodiment takes the maximum cell voltage of the battery as the adjustment target, adjusts the second charging request current of the charging pile during the battery charging process, and by setting the voltage adjustment threshold, the charging request current is derating when the maximum cell voltage of the battery does not reach the voltage clamping point, thereby solving the step problem caused by the voltage clamping causing the request rate to jump down, improving the battery charging capacity, and reducing the remaining charging time.

[0176] Furthermore, in a possible implementation of the embodiment of the present disclosure, as Figure 8 As shown, the first determining unit 73 includes:

[0177] A start module 731 is used to start PI control;

[0178] The calculation module 732 is used to calculate the voltage regulation threshold and the first clamping voltage based on the PI control to obtain a derating amount of the charging request current.

[0179] Furthermore, in a possible implementation of the embodiment of the present disclosure, as Figure 8 As shown, the calculation module 732 is also used for:

[0180] Calculating the difference between the maximum single cell voltage of the battery and the voltage regulation threshold to obtain a difference result;

[0181] According to the product of the calibration proportional coefficient and the difference result, the proportional derating is obtained;

[0182] Calculate the step-length accumulation of the difference result;

[0183] The integrated power derating is obtained by multiplying the calibrated integral coefficient by the accumulated step length;

[0184] The derating amount of the charging request current is obtained according to the sum of the integrated power derating and the proportional derating.

[0185] Furthermore, in a possible implementation of the embodiment of the present disclosure, as Figure 8 As shown, the calculation unit 74 is further configured to calculate a difference between the first charging request current and the derating amount to obtain the second charging request current.

[0186] Furthermore, in a possible implementation of the embodiment of the present disclosure, as Figure 8 As shown, the query unit 71 is also used for:

[0187] Query the current temperature information and the charging request rate corresponding to the remaining power in the preset fast charging rate table;

[0188] converting the charging request rate into the first charging request current;

[0189] The first clamping voltage corresponding to the current remaining power and the maximum single cell voltage is queried in the preset fast charge rate table.

[0190] Furthermore, in a possible implementation of the embodiment of the present disclosure, as Figure 8 As shown, the device also includes:

[0191] The judging unit 76 is further configured to judge whether the second charging request current is less than a first clamping current after the sending unit 75 sends the second charging request current to the charging pile, wherein the first clamping current is calculated according to the first clamping voltage and a corresponding clamping ratio;

[0192] a control unit 77, configured to turn off the PI control when it is determined that the second charging request current is less than the first clamping current;

[0193] The second determining unit 78 is configured to determine the second charging request current as the first clamping current at a current moment.

[0194] Furthermore, in a possible implementation of the embodiment of the present disclosure, as Figure 8 As shown, the device also includes:

[0195] A third determining unit 79 is used to determine whether the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is that the charging pile is abnormal after the PI control is started;

[0196] The control unit 77 is further configured to shut down the PI control when it is determined that the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is that the charging pile is abnormal.

[0197] Furthermore, in a possible implementation of the embodiment of the present disclosure, as Figure 8 As shown, the device also includes:

[0198] The query unit 71 is further configured to query the third charging request current and the second clamping voltage again according to the temperature information, the remaining power and the maximum cell voltage of the battery cell after the control unit turns off the PI control and after determining that the remaining power of the battery reaches the first threshold;

[0199] The control unit 77 is further configured to control to end clamping based on the first clamping voltage and start clamping based on the second clamping voltage if the third charging request current is less than the first clamping current;

[0200] The fourth determining unit 710 is configured to determine the first clamping current as a second charging request current.

[0201] Furthermore, in a possible implementation of the embodiment of the present disclosure, as Figure 8 As shown, the device also includes:

[0202] A fifth determining unit 711 is used to determine whether the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is a temperature rise of the battery after the PI control is started, different temperature intervals correspond to different first clamping voltages, and the temperature of the temperature interval is positively correlated with the clamping voltage;

[0203] The control unit 77 is further configured to shut down the PI control when it is determined that the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is due to a temperature rise of the battery.

[0204] Furthermore, in a possible implementation of the embodiment of the present disclosure, as Figure 8 As shown, the setting unit 72 is further configured to:

[0205] setting a voltage margin according to the accuracy of the first clamping voltage;

[0206] The voltage regulation threshold is set according to a difference between the first clamping voltage and the voltage margin.

[0207] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0208] Fig. 9is a block diagram of a vehicle 900 according to an exemplary embodiment. For example, the vehicle 900 may be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicles. The vehicle 900 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0209] Reference Fig. 9 , the vehicle 900 may include various subsystems, for example, an infotainment system 910, a perception system 920, a decision control system 930, a drive system 940, and a computing platform 950. The vehicle 900 may also include more or fewer subsystems, and each subsystem may include multiple components. In addition, each subsystem and each component of the vehicle 900 may be interconnected by wire or wireless means.

[0210] In some embodiments, the infotainment system 910 may include a communication system, an entertainment system, and a navigation system, etc.

[0211] The perception system 920 may include several sensors for sensing information about the environment around the vehicle 900. For example, the perception system 920 may include a global positioning system (the global positioning system may be a GPS system, or a Beidou system or other positioning systems), an inertial measurement unit (IMU), a laser radar, a millimeter wave radar, an ultrasonic radar, and a camera.

[0212] The decision control system 930 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0213] The drive system 940 may include components that provide powered motion for the vehicle 900. In one embodiment, the drive system 940 may include an engine, an energy source, a transmission system, and wheels. The engine may be a combination of one or more of an internal combustion engine, an electric motor, and an air compression engine. The engine is capable of converting energy provided by the energy source into mechanical energy.

[0214] Some or all functions of the vehicle 900 are controlled by a computing platform 950. The computing platform 950 may include at least one processor 951 and a memory 952, and the processor 951 may execute instructions 953 stored in the memory 952.

[0215] The processor 951 may be any conventional processor, such as a commercially available CPU. The processor may also include a graphics processor (Graphic Process Unit, GPU), a field programmable gate array (Field Programmable Gate Array, FPGA), a system on chip (System on Chip, SOC), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC) or a combination thereof.

[0216] The memory 952 may be implemented by any type of volatile or nonvolatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0217] In addition to instructions 953 , memory 952 may also store data, such as road maps, route information, vehicle location, direction, speed, etc. The data stored in memory 952 may be used by computing platform 950 .

[0218] In the embodiment of the present disclosure, the processor 951 may execute instruction 953 to complete all or part of the steps of the above-mentioned XXXX method.

[0219] The present disclosure also provides a computer-readable storage medium having computer program instructions stored thereon, and when the program instructions are executed by a processor, the steps of the charging control method provided by the present disclosure are implemented.

[0220] In addition, the word "exemplary" is used herein to indicate serving as an example, instance, or diagram. Any aspect or design described as "exemplary" in this article is not necessarily understood to be advantageous compared to other aspects or designs. On the contrary, the use of the word exemplary is intended to present concepts in a specific way. As used herein, the term "or" is intended to represent an inclusive "or" rather than an exclusive "or". That is, unless otherwise specified or clear from the context, "X applies A or B" is intended to represent any one of the natural inclusive arrangements. That is, if X applies A; X applies B; or X applies both A and B, "X applies A or B" is satisfied under any of the aforementioned examples. In addition, unless otherwise specified or clearly pointed to a singular form from the context, the articles "one" and "an" as used in this application and the appended claims are generally understood to mean "one or more".

[0221] Likewise, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art after reading and understanding the specification and drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components (e.g., elements, resources, etc.) described above, unless otherwise noted, the terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific functions of the described components, even if the structure is not equivalent to the disclosed structure. In addition, although the specific features of the present disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations as may be desired and conducive to any given or specific application. In addition, with respect to "including", "having", "having", "having", or variations thereof used in the specific embodiments or claims, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0222] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0223] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

[0224] In the above detailed description, reference is made to the accompanying drawings, which illustrate specific aspects of the present disclosure that can be practiced by way of illustration. In this regard, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating directions or representing positional relationships, can be used with reference to the orientation of the described figures. Since the components of the described device can be positioned in a plurality of different orientations, directional terms can be used for illustrative purposes rather than restrictive. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concepts of the present disclosure. Therefore, the following detailed description should not be considered in a limiting sense.

[0225] It should be understood that, unless otherwise specifically noted, the features of some embodiments of the various present disclosures described herein may be combined with each other. As used herein, the term "and / or" includes any one of the related listed items and any combination of any two or more; similarly, "at least one of . . . " includes any one of the related listed items and any combination of any two or more.

[0226] It should be understood that, unless otherwise clearly specified and limited, the terms "joining", "attaching", "installing", "connecting", "connecting", "fixing" and the like used in the embodiments of the present disclosure should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0227] In addition, the term "above" used in relation to a component, element or material layer formed "above" or located "above" a surface may be used herein to indicate that the component, element or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements or layers are arranged between the surface and the component, element or material layer. However, the term "above" used in relation to a component, element or material layer formed "above" or located "above" a surface may also optionally have a specific meaning: the component, element or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, such as in direct contact with the surface.

[0228] Although terms such as "first", "second" and "third" can be used herein to describe various components, parts, regions, layers or sections, these components, parts, regions, layers or sections are not limited to these terms. On the contrary, these terms are only used to distinguish one component, component, region, layer or section from another component, component, region, layer or section. Therefore, without departing from the teachings of each example, the first component, component, region, layer or section mentioned in the examples described herein may also be referred to as the second component, component, region, layer or section. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may expressly or implicitly include at least one of the features. In the description herein, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0229] It should be understood that spatially relative terms such as "above", "upper", "below", and "lower" are used herein to describe the relationship of one element to another element shown in the figures. In addition to the orientation depicted in the drawings, such spatially relative terms are also intended to include different orientations of the device in use or operation. For example, if the device in the drawings is turned over, the element described as being "above" or "upper" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" includes both upper and lower orientations. The device may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

Claims

1. A charging control method, characterized in that: include: According to the current temperature information, remaining power and maximum cell voltage of the battery cell, query the corresponding first charging request current and first clamping voltage; Setting a voltage regulation threshold according to the first clamping voltage, wherein the voltage regulation threshold is less than the first clamping voltage; When it is monitored that the cell voltage is greater than or equal to the voltage regulation threshold, determining a derating amount of the charging request current according to the voltage regulation threshold and the first clamping voltage; A second charging request current is calculated according to the first charging request current and the derating amount, and the second charging request current is sent to the charging pile.

2. The method according to claim 1, characterized in that The step of determining the derating amount of the charging request current according to the voltage regulation threshold and the first clamping voltage comprises: The PI control is started, and the voltage regulation threshold and the first clamping voltage are calculated based on the PI control to obtain a derating amount of the charging request current.

3. The method according to claim 2, characterized in that The step of calculating the voltage regulation threshold and the first clamping voltage based on the PI control to obtain the derating amount of the charging request current includes: Calculating the difference between the maximum single cell voltage of the battery and the voltage regulation threshold to obtain a difference result; According to the product of the calibration proportional coefficient and the difference result, the proportional derating is obtained; Calculate the step-length accumulation of the difference result; The integrated power derating is obtained by multiplying the calibrated integral coefficient by the accumulated step length; The derating amount of the charging request current is obtained according to the sum of the integrated power derating and the proportional derating.

4. The method according to claim 1, characterized in that: The calculating the second charging request current according to the first charging request current and the derating amount comprises: The difference between the first charging request current and the derating amount is calculated to obtain the second charging request current.

5. The method according to claim 1, characterized in that: The querying of the corresponding first charging request current and first clamping voltage according to the current temperature information, the remaining power and the maximum cell voltage of the battery cell comprises: Query the current temperature information and the charging request rate corresponding to the remaining power in the preset fast charging rate table; converting the charging request rate into the first charging request current; The first clamping voltage corresponding to the current remaining power and the maximum single cell voltage is queried in the preset fast charge rate table.

6. The method according to claim 2, characterized in that After sending the second charging request current to the charging pile, the method further includes: Determining whether the second charging request current is less than a first clamping current, wherein the first clamping current is calculated according to the first clamping voltage and a corresponding clamping ratio; If it is determined that the second charging request current is less than the first clamping current, turning off the PI control; The second charging request current is determined as the first clamping current at a current moment.

7. The method according to claim 2, characterized in that After starting the PI control, the method further includes: Determine whether the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is that the charging pile is abnormal; When it is determined that the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is that the charging pile is abnormal, the PI control is turned off.

8. The method according to claim 6, characterized in that After turning off the PI control, the method further includes: After determining that the remaining power of the battery reaches the first threshold, querying the third charging request current and the second clamping voltage again according to the temperature information, the remaining power and the maximum cell voltage of the battery cell; If the third charging request current is less than the first clamping current, controlling to end clamping based on the first clamping voltage and start clamping based on the second clamping voltage; The first clamping current is determined as a second charging request current.

9. The method according to claim 2, characterized in that: After starting the PI control, the method further includes: Determine whether the reason why the maximum single cell voltage of the battery is higher than the first clamping voltage is that the temperature of the battery rises, different temperature intervals correspond to different clamping voltages, and the temperature of the temperature interval is positively correlated with the clamping voltage; If it is determined that the reason why the maximum single-cell voltage of the battery is higher than the first clamping voltage is due to a temperature rise of the battery, the PI control is turned off.

10. The method according to claim 1, characterized in that The setting of the voltage regulation threshold according to the first clamping voltage comprises: setting a voltage margin according to the accuracy of the first clamping voltage; The voltage regulation threshold is set according to a difference between the first clamping voltage and the voltage margin.

11. A charging control device, characterized in that: include: A query unit, used to query the corresponding first charging request current and first clamping voltage according to the current temperature information, remaining power and maximum cell voltage of the battery cell; a setting unit, configured to set a voltage adjustment threshold according to the first clamping voltage, wherein the voltage adjustment threshold is less than the first clamping voltage; a first determining unit, configured to determine a derating amount of a charging request current according to the voltage regulation threshold and the first clamping voltage when monitoring that a cell voltage is greater than or equal to the voltage regulation threshold; a calculation unit, configured to calculate a second charging request current according to the first charging request current and the derating amount; A sending unit is used to send the second charging request current to the charging pile.

12. A vehicle, characterized in that: include: processor; a memory for storing processor-executable instructions; Wherein, the processor is used for: Implement the method according to any one of claims 1 to 10.

13. A non-transitory computer-readable storage medium, when instructions in the storage medium are executed by a processor of a mobile terminal, the mobile terminal is enabled to execute the method according to any one of claims 1 to 10.

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