A super-fast charging control method, system, medium and new energy vehicle

Abstract

The application discloses a super-fast charging control method and system, a medium and a new energy vehicle. The method comprises the following steps: monitoring whether the temperature rising rate and the internal resistance value of the battery during super-fast charging are over standard in real time; if both are not over standard, monitoring whether the voltage difference between each cell voltage in the battery is over standard, or whether the voltage difference between the calibrated charging voltage and the actual voltage corresponding to each cell is over standard; if any voltage difference is over standard, fitting a charging supplementary current according to the over-standard voltage difference, and increasing the charging supplementary current on the basis of the original charging current to increase the charging of all cells in the battery; wherein the over-standard voltage difference is positively correlated with the charging supplementary current.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging, in particular to a super-fast charging control method and system, a medium and a new energy vehicle. BACKGROUND

[0002] With the rapid expansion of the new energy vehicle market, super-fast charging technology has achieved a leap in development, greatly reducing the range anxiety and charging anxiety of new energy vehicle users. However, super-fast charging generally pursues a large or even super-large charging rate, which can cause the battery to heat up too quickly and pose a risk of lithium precipitation, which can easily damage the battery.

[0003] Therefore, the super-fast charging method of the prior art has the technical problem of easily causing damage to the battery. SUMMARY

[0004] To solve or partially solve the technical problem of the prior art that the super-fast charging method easily causes damage to the battery, the present application provides a super-fast charging control method and system, a medium and a new energy vehicle. In a scenario where the temperature rise rate and internal resistance value are both within the standard, the charging current is supplemented according to the voltage difference between each cell voltage in the battery or the voltage difference between the calibrated charging voltage and the actual voltage of each cell, so that the battery can be quickly charged without exceeding the temperature resistance value. This can not only ensure the charging performance, but also avoid damage to the battery caused by overcharging, ensuring the safety of the battery.

[0005] To solve the above technical problem, the first aspect of the present application discloses a super-fast charging control method, which comprises:

[0006] monitoring whether the temperature rise rate and internal resistance value of the battery during super-fast charging are within the standard;

[0007] if both are within the standard, monitoring whether the voltage difference between each cell voltage in the battery is within the standard, or whether the voltage difference between the calibrated charging voltage and the actual voltage of each cell is within the standard;

[0008] if any voltage difference is out of the standard, fitting a charging supplementary current according to the out-of-standard voltage difference and increasing the charging supplementary current on the basis of the original charging current to increase the charging of all cells in the battery; wherein the out-of-standard voltage difference is positively correlated with the charging supplementary current.

[0009] Optionally, if multiple voltage differences are out of the standard, fitting the charging supplementary current according to the maximum value in the out-of-standard voltage differences.

[0010] Optionally, if both are within the standard, the method further comprises:

[0011] monitoring the change of the voltage difference between each cell voltage, or the change of the voltage difference between the calibrated charging voltage and the actual voltage of each cell;

[0012] if the change of the voltage difference indicates that the voltage difference gradually increases over time, fitting the charging supplement current according to the voltage difference increase value, and increasing the charging supplement current based on the original charging current to increase the charging of all cells in the battery; the charging supplement current is positively correlated with the voltage difference increase value;

[0013] if the change of the voltage difference indicates that the voltage difference gradually decreases over time, fitting the charging reduction current according to the voltage difference decrease value, and reducing the charging reduction current based on the original charging current to reduce the charging of all cells in the battery; or keeping the original charging current unchanged for charging.

[0014] Optionally, if none of them is out of standard, the method further comprises:

[0015] monitoring whether the power growth rate of each cell exceeds the calibrated growth rate corresponding to each SOC charge interval;

[0016] in each SOC charge interval, if the power growth rate does not exceed the calibrated growth rate, fitting the charging supplement current according to the power growth rate, and increasing the charging supplement current based on the original charging current to increase the charging of all cells in the battery;

[0017] in each SOC charge interval, if the power growth rate exceeds the calibrated growth rate, fitting the charging reduction current according to the power growth rate, and reducing the charging reduction current based on the original charging current to reduce the charging of all cells in the battery.

[0018] Optionally, after monitoring whether the temperature rise rate and the internal resistance value of the battery during super-fast charging are out of standard, the method further comprises:

[0019] if both are out of standard, fitting the final charging current according to the formula comprehensively controlling the charging of all cells in the battery; wherein i is the final charging current, i0 is the original charging current, η is the temperature rise rate, k1 is an adjustment factor fitted according to the temperature rise rate, and the temperature rise rate is positively correlated with the adjustment factor, For the internal resistance value, k2 is an adjustment factor fitted according to the internal resistance value, and the internal resistance value is positively correlated, U is the actual charging voltage, k3 is an adjustment factor fitted according to the charging voltage, and the charging voltage is positively correlated, when the actual charging voltage U is less than the voltage calibration value corresponding to each SOC interval, the original charging current is increased, when the actual charging voltage U is greater than the voltage calibration value corresponding to each SOC interval, the original charging current is decreased, and α, β, and γ are weights, α+β+γ=1.

[0020] Optionally, after the real-time monitoring of whether the temperature rise rate and the internal resistance value of the battery during super-fast charging are excessive, the method further comprises:

[0021] If the temperature rise rate is excessive, the charging of all the battery cells in the battery is controlled according to the formula i=i0-α·k1·η.

[0022] Optionally, after the real-time monitoring of whether the temperature rise rate and the internal resistance value of the battery during super-fast charging are excessive, the method further comprises:

[0023] If the internal resistance value is excessive, the charging of all the battery cells in the battery is controlled according to the formula

[0024] In a second aspect of the present application, a super-fast charging control system is disclosed, the system comprising:

[0025] A first monitoring module is configured to monitor whether the temperature rise rate and the internal resistance value of the battery during super-fast charging are excessive in real time.

[0026] A second monitoring module is configured to monitor whether the voltage difference between the voltages of the battery cells in the battery is excessive, or whether the voltage difference between the calibration charging voltage and the actual voltage corresponding to the battery cells is excessive, if neither is excessive.

[0027] An adjustment module is configured to fit a charging supplementary current according to the excessive voltage difference value, and increase the charging supplementary current on the basis of the original charging current, to increase the charging of all the battery cells in the battery, if any voltage difference value is excessive; wherein the excessive voltage difference value is positively correlated with the charging supplementary current.

[0028] Optionally, if multiple voltage difference values are excessive, the charging supplementary current is fitted according to the maximum value in the excessive voltage difference values.

[0029] Optionally, if neither is excessive, the system further comprises:

[0030] A third monitoring module is further configured to monitor the change of the voltage difference between the voltages of the battery cells, or the change of the voltage difference between the calibration charging voltage and the actual voltage corresponding to the battery cells.

[0031] ​a first current increasing module, configured to, if the change in the pressure difference value indicates that the pressure difference value gradually increases over time, fit the charging supplementary current according to the pressure difference growth value, and increase the charging supplementary current on the basis of the original charging current to increase charging of all cells in the battery; the charging supplementary current is positively correlated with the pressure difference growth value;

[0032] The first current reduction module is used to fit the charging reduction current according to the voltage difference reduction value if the change in the voltage difference value indicates that the voltage difference value gradually decreases over time, and reduce the charging reduction current on the basis of the original charging current to reduce the charging of all battery cells in the battery; or keep the original charging current unchanged for charging.

[0033] Optionally, if none of the above standards are exceeded, the system further comprises:

[0034] a fourth monitoring module, configured to monitor whether the charge growth rate of each battery cell exceeds a calibrated growth rate corresponding to each SOC charge interval;

[0035] a second current increasing module, configured to, in each SOC charge interval, if the charge growth rate does not exceed the calibrated growth rate, fit the charging supplementary current according to the charge growth rate, and increase the charging supplementary current on the basis of the original charging current, so as to increase charging of all cells in the battery;

[0036] The second current reduction module is used to fit the charging reduction current according to the power growth rate in each SOC charge interval if the power growth rate exceeds the calibrated growth rate, and reduce the charging reduction current based on the original charging current to reduce the charging of all battery cells in the battery.

[0037] Optionally, the system further includes:

[0038] Comprehensive control module, used to if all exceed the standard, according to the formula Comprehensively control the charging of all cells in the battery; wherein i is the final charging current, i0 is the original charging current, η is the heating rate, k1 is the adjustment factor fitted according to the heating rate, k1 and the heating rate are positively correlated, is the internal resistance value, k2 is the adjustment factor fitted according to the internal resistance value, k2 is positively correlated with the internal resistance value, U is the actual charging voltage, k3 is the adjustment factor fitted according to the charging voltage, and is positively correlated with the charging voltage. When the actual charging voltage U is less than the voltage calibration value corresponding to each SOC interval, the original charging current is increased; when the actual charging voltage U is greater than the voltage calibration value corresponding to each SOC interval, the original charging current is reduced. α, β, and γ are weights, and α+β+γ=1.

[0039] Optionally, the system further comprises:

[0040] The first control module is configured to control the charging of all the battery cells in the battery according to the formula i = i0- a k1 eta if the temperature rise rate is out of the standard.

[0041] Optionally, the system further comprises:

[0042] The second control module is configured to control the charging of all the battery cells in the battery according to the formula if the internal resistance value is out of the standard.

[0043] In a third aspect, the present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the above method.

[0044] In a fourth aspect, the present application provides a new energy vehicle comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the program.

[0045] The present application has the following advantages and benefits:

[0046] The present application provides a super-fast charging control method, system, medium and new energy vehicle. In a scenario where the temperature rise rate and the internal resistance value are both within the standard, the charging current is supplemented according to the voltage difference between each battery cell or the voltage difference between the calibrated charging voltage and the actual voltage of each battery cell, so that the battery can be quickly charged without exceeding the temperature and internal resistance values. The charging performance can be guaranteed, and the damage of the battery caused by overcharging can be avoided, thereby ensuring the charging safety of the battery.

[0047] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0048] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments, and are not meant to limit the present application. Moreover, the same reference numerals are used throughout the several views to designate the same or similar parts. In the drawings:

[0049] Figure 1 A flowchart of a super-fast charging control method according to an embodiment of the present application is shown.

[0050] Figure 2 A schematic diagram of a charging control system of super-fast charging according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0051] Exemplary embodiments of the present application will be described in detail with reference to the drawings. Although exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0052] Exemplary embodiments of the present application will be described in detail with reference to the drawings. Although exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0053] In a first aspect, the super-fast charging control method provided by the embodiments of the present application considers that the temperature change of the battery can be directly measured and will be affected by the internal resistance change, so the battery heat change is characterized by monitoring the temperature rise rate and internal resistance value of the battery, and different charging methods are used for flexible charging of the battery in different scenarios (such as the scenarios where both are not exceeded, both are exceeded, only one is exceeded, etc.), thereby solving the battery charging demand in multiple scenarios.

[0054] As Figure 1 shown, the super-fast charging control method provided by the embodiments of the present application at least includes the following steps:

[0055] S101: Real-time monitoring of whether the temperature rise rate and internal resistance value of the battery during super-fast charging are exceeded.

[0056] In this embodiment, charging is first performed according to the conventional charging map table, as shown in Table 1.

[0057] Table 1

[0058] SOC 0％ 10％ 20％ 30％ 40％ 50％ 60％ 70％ 80％ 90％ 100％ Voltage 3.45 3.52 3.60 3.69 3.74 3.81 3.88 3.92 3.97 4.15 4.20 Rate 0.5 1.6 2.5 2.5 2.5 2 1.8 1.5 1.0 0.33 0.1

[0059] In Table 1, the calibration charging voltage and rate of each SOC interval endpoint are listed, and the initial charging operation is performed according to the data in the above table. Of course, it can be changed to a SOC interval range, for example, when the SOC interval range is [0, 10], the calibration charging voltage is [3.45, 3.52]. Each SOC value has its own calibration charging voltage.

[0060] In the charging process, whether the temperature rise rate η of the battery during super-fast charging exceeds a temperature threshold η0, and whether the internal resistance value exceeds an internal resistance threshold For example, η0≥ 0.5℃ / min, preferably η0≥ 3℃ / min. The internal resistance threshold wherein ζ is a proportional factor, ζ > 1.0, preferably ζ ≥ 1.1.

[0061] If η < η0and both are not exceeded, the charging current is adjusted in real time by judging the voltage change of each single cell in the battery.

[0062] If the consistency of each cell in the battery is good, the voltage rise amplitude of each cell is consistent during the charging process. If the consistency of each cell in the battery is poor, the voltage rise amplitude of each cell is different during the charging process.

[0063] Accordingly, the charging current is adjusted by referring to the single cell voltage value of each cell, the charge growth rate of each cell, the voltage difference value between each cell voltage, the voltage difference value between the calibrated charging voltage and the actual voltage corresponding to each cell, the voltage difference value change following the change of time between each cell voltage, and the voltage difference value change following the change of time between the calibrated charging voltage and the actual voltage corresponding to each cell.

[0064] As an optional implementation, if the temperature rise rate η and the internal resistance value both are not exceeded, in each SOC interval, whether the single cell voltage value of each cell exceeds the corresponding calibrated charging voltage is monitored, which is obtained by looking up Table 1. If not, the charging supplementary current i 补 is fitted according to the maximum value in the voltage difference value of each cell. 补 On the basis of the original charging current i0, the charging supplementary current i 补 is added to increase the charging of all cells in the battery. That is, the charging current value is increased from the original charging current i0 to (i0+i 补 ) for charging. At this time, the charging supplementary current i 补 is positively correlated with the voltage difference value, that is, the greater the voltage difference value, the greater the charging supplementary current i 补 .

[0065] wherein the single cell voltage difference value of each cell = the calibrated charging voltage of each cell - the actual charging voltage of each cell. Since the single cell voltage difference values of each cell are not equal, the maximum value is selected to fit the charging supplementary current i 补 . In the fitting process, according to the positive fitting relationship between the voltage difference value and the charging supplementary current i 补Specifically, the mapping relationship between the differential pressure value and the charging supplemental current i 补 is determined first, and the charging supplemental current i 补 corresponding to the maximum value is fitted according to the mapping relationship.

[0066] It is worth noting that each SOC interval corresponds to a respective calibrated charging voltage, and therefore each SOC interval needs to be adjusted once. Further, in order to prevent the battery from being damaged due to overshoot, a SOC threshold, for example 90%, is designed, and the above adjustment strategy needs to be performed below the SOC threshold.

[0067] As an optional implementation, if the temperature rise rate η and the internal resistance value R both do not exceed the standard, in each SOC interval, it is monitored whether the power growth rate of each cell exceeds the calibrated growth rate corresponding to the SOC charge interval. Taking the charge interval of 10% to 20% of SOC as an example, according to the design, a normal cell needs to rise from 3.52V to 3.6V within time t, and the calibrated growth rate of this interval is calculated as (3.6V-3.52V)÷t.

[0068] In each SOC charge interval, if the power growth rate does not exceed the calibrated growth rate, it means that the charging is slow, and according to the design, a normal cell needs time t to rise from 3.52V to 3.6V, but in the actual situation, it needs time (t+Δt) to rise from 3.52 to 3.6V, then the charging supplemental current i 补 is fitted according to the power growth rate, and the charging supplemental current i 补 is added to the original charging current i0 to increase the charging of all cells in the battery. That is, the charging current value is increased from the original charging current i0 to (i0+i 补 ) for charging. At this time, the charging supplemental current i 补 and the power growth rate are positively correlated, that is, the greater the power growth rate, the greater the charging supplemental current i 补 .

[0069] In the fitting process, according to the positive fitting relationship between the power growth rate and the charging supplemental current i 补 , the corresponding charging supplemental current i 补 is fitted. Specifically, the mapping relationship between the power growth rate and the charging supplemental current i 补 is determined first, and the charging supplemental current i 补 corresponding to the power growth rate is fitted according to the mapping relationship.

[0070] In each SOC charge interval, if the power growth rate exceeds the calibrated growth rate, it means that the growth is too fast. According to the design, the normal battery cell needs to rise from 3.52V to 3.6V within time t, but in actual situation, it needs to rise from 3.52 to 3.6V within time (t-Δt). In this case, the charging current i is reduced according to the power growth rate. 降 , and reduce the charging current i based on the original charging current i0 降 , so as to reduce the charge of all cells in the battery. That is, the charging current value is reduced from the original charging current i0 to (i0-i 降 ) to charge. At this time, the charging current i 降 It is positively correlated with the rate of increase of power, that is, the greater the rate of increase of power, the lower the charging current i 降 The bigger.

[0071] During the fitting process, the current i is reduced according to the rate of increase of power and charging. 降 The forward fitting relationship of the corresponding charging reduction current i is fitted 降 Specifically, first determine the rate of increase in power and the charging current i 降 The mapping relationship is calculated by looking up the table to fit the charging current i corresponding to the power growth rate. 降 .

[0072] It's worth noting that each SOC range corresponds to its own calibrated growth rate, so each SOC range requires readjustment. Furthermore, to prevent overcharging and battery damage, an SOC threshold, such as 90%, is designed, below which the aforementioned adjustment strategy must be executed.

[0073] As an optional implementation, if the heating rate η and the internal resistance If both are within the limit, execute S102.

[0074] S102: monitoring whether a voltage difference between the voltages of the battery cells in the battery exceeds a standard, or whether a voltage difference between the calibrated charging voltage and the actual voltage corresponding to each battery cell exceeds a standard.

[0075] During implementation, the voltage difference between each cell in the battery is calculated to obtain the voltage difference between them. The voltage difference between each cell's calibrated charging voltage and its actual voltage is calculated to obtain the voltage difference between them. The voltage difference standard can be determined based on charging history data or customized by the user. For example, the voltage difference standard between each cell's voltage is 1V, and the voltage difference standard between each cell's calibrated charging voltage and its actual voltage is 1.5V, but this is not a limitation.

[0076] If any of the pressure difference values ​​obtained above exceeds the standard, S103 is executed.

[0077] S103: Fitting the charging supplementary current i according to the excess voltage difference 补 , and increase the charging supplementary current i on the basis of the original charging current i0 补 , so as to increase the charging of all cells in the battery. That is, the charging current value is increased from the original charging current i0 to (i0+i 补 ) for charging. At this time, the excess voltage difference and the charging supplementary current i 补 Positive correlation.

[0078] During the fitting process, according to the excess voltage difference and the charging supplementary current i 补 The forward fitting relationship of the corresponding charging supplementary current i 补 Specifically, first determine the excess voltage difference and the charging supplementary current i 补 The mapping relationship is used to look up the table and fit the charging supplementary current i corresponding to the voltage difference exceeding the standard. 补 .

[0079] If multiple voltage difference values ​​exceed the standard, the charging supplementary current i is fitted according to the maximum value of the voltage difference values ​​that exceed the standard. 补 .

[0080] It is worth noting that since different pressure differential standards can be set for each SOC interval, each SOC interval can be readjusted. Specifically, in each SOC interval, the voltage differential between the cell voltages within the battery is monitored to see if it exceeds the standard, or if the voltage differential between the calibrated charging voltage and the actual voltage corresponding to each cell exceeds the standard. In each SOC interval, if any of the obtained pressure differential values ​​exceeds the standard, S103 is executed.

[0081] Furthermore, in order to prevent overcharging from causing damage to the battery, an SOC threshold is designed, for example, 90%, and the above adjustment strategy needs to be executed below this SOC threshold.

[0082] As an optional implementation, if the heating rate η and the internal resistance Both of them are within the standard, and the voltage difference change between the voltages of the battery cells, or the voltage difference change between the calibrated charging voltage and the actual voltage corresponding to the battery cells is monitored.

[0083] Specifically, a curve showing the voltage difference between each cell voltage as it changes over time, or a curve showing the voltage difference between the rated charging voltage and the actual voltage corresponding to each cell as it changes over time can be fitted, and the current change of the voltage difference can be found from the curve.

[0084] If the pressure difference value change represents that the pressure difference value gradually increases with time, indicating insufficient charging, the charging supplement current i is fitted according to the pressure difference growth value 补 , and the charging supplement current i is added to the original charging current i 补 to increase the charging of all the cells in the battery. That is, the charging current value is increased from the original charging current i 补 to (i 补 ) for charging. At this time, the charging supplement current i 补 and the pressure difference growth value are positively correlated, that is, the greater the pressure difference growth value, the greater the charging supplement current i 补 .

[0085] In the fitting process, the corresponding charging supplement current i is fitted according to the positive fitting relationship between the pressure difference growth value and the charging supplement current i 补 . Specifically, the mapping relationship between the pressure difference growth value and the charging supplement current i 补 is determined first, and the charging supplement current i corresponding to the pressure difference growth value is fitted according to the mapping relationship.

[0086] If there are multiple pressure difference growth values, the charging supplement current i is fitted according to the maximum value in the pressure difference growth value 补 .

[0087] If the pressure difference value change represents that the pressure difference value gradually decreases with time, indicating that the pressure difference gradually decreases and is in a normal charging process. If the pressure difference decreases too quickly, there may also be a problem of too fast charging.

[0088] Therefore, in order to distinguish between normal fast or too fast charging, a pressure difference decrease reference value is set.

[0089] If the pressure difference value change represents that the pressure difference value gradually decreases with time and is less than the pressure difference decrease reference value, it indicates that the pressure difference gradually decreases and is in a normal charging process. At this time, the original charging current is kept unchanged for charging.

[0090] If the pressure difference value change represents that the pressure difference value gradually decreases with time and is greater than or equal to the pressure difference decrease reference value, it indicates that the pressure difference gradually decreases but the charging is too fast. At this time, the charging decrease current i is fitted according to the pressure difference decrease value 降 , and the charging decrease current i is reduced to the original charging current i 降 to reduce the charging of all the cells in the battery. That is, the charging current value is reduced from the original charging current i 降 to (i 降 ) for charging. At this time, the charging decrease current i 降 and the pressure difference decrease value are positively correlated, that is, the greater the power growth rate, the greater the charging decrease current i 降 .

[0091] During the fitting process, the voltage drop value and the charging current i are reduced according to the 降 The forward fitting relationship of the corresponding charging reduction current i is fitted 降 Specifically, first determine the voltage difference reduction value and the charging current reduction value i 降 The mapping relationship is calculated by looking up the table according to the mapping relationship, and fitting the charging current i corresponding to the voltage difference reduction value is obtained. 降 .

[0092] If there are multiple voltage drop values, the charging current i is fitted according to the maximum value of the voltage drop value. 降 .

[0093] It is worth noting that since different voltage difference change reference values ​​can be set for each SOC interval, each SOC interval can be readjusted once. Specifically, in each SOC interval, the voltage difference between the battery cell voltages, or the voltage difference between the calibrated charging voltage and the actual voltage corresponding to each battery cell, is monitored, and the charging adjustment strategy described above is executed based on the voltage difference change, which will not be repeated here.

[0094] The above is the heating rate η and internal resistance value Both of them do not exceed the charging adjustment strategy.

[0095] As an optional implementation, the temperature rise rate η and internal resistance of the battery during super fast charging are monitored in real time. After exceeding the standard, if the heating rate η and internal resistance value If both of them exceed the standard, the charging of all cells in the battery is comprehensively controlled according to formula (1) until both of them do not exceed the standard, or any one of them exceeds the standard.

[0096]

[0097] Wherein, i is the final charging current, i0 is the original charging current, η is the heating rate η, and k1 is the adjustment factor fitted according to the heating rate η, which is positively correlated with the heating rate η. The internal resistance value k2 is the internal resistance value according to The fitted adjustment factor and the internal resistance value is positively correlated, U is the actual charging voltage, k3 is an adjustment factor fitted according to the actual charging voltage, and is positively correlated with the charging voltage, α, β, and γ are weights, and α+β+γ=1.

[0098] Specifically, if the charging voltage U is less than the voltage calibration value corresponding to each SOC interval in each SOC interval, the original charging current is increased in each SOC interval. The charging of all the battery cells is comprehensively controlled. If the actual charging voltage U is greater than the voltage calibration value corresponding to each SOC interval in each SOC interval, then the original charging current is reduced in each SOC interval. That is, the charging of all the battery cells is controlled according to the formula i = i0- k1·U. The charging of all the battery cells is comprehensively controlled.

[0099] As an optional implementation, the temperature rise rate η and the internal resistance value of the battery during super-fast charging are monitored in real time. After determining whether the temperature rise rate η and the internal resistance value are excessive, if the temperature rise rate η is excessive but the internal resistance value is not excessive, the charging of all the battery cells is controlled according to the formula i = i0- k1·η.

[0100] Further, if the temperature rise rate η is excessive but the internal resistance value is not excessive, it is further determined in each SOC interval whether the actual charging voltage is less than the voltage calibration value corresponding to each SOC interval or less than the upper limit cutoff voltage corresponding to each SOC interval. If yes, the charging of all the battery cells is controlled according to the formula i = i0- a'·k1·η + g'·k3·U in each SOC interval until the temperature rise rate η is not excessive. Wherein a' and g' are weights, and a' + g' = 1.

[0101] If no, the charging of all the battery cells is controlled according to the formula i = i0- a'·k1·η + g'·k3·U in each SOC interval until the temperature rise rate η is not excessive.

[0102] It is worth noting that after the temperature rise rate η is not excessive and the internal resistance value is not excessive, the charging adjustment logic when both the temperature rise rate η and the internal resistance value are not excessive is dynamically adjusted.

[0103] As an optional implementation, the temperature rise rate η and the internal resistance value of the battery during super-fast charging are monitored in real time. After determining whether the temperature rise rate η and the internal resistance value are excessive, if the internal resistance value is excessive but the temperature rise rate η is not excessive, the charging of all the battery cells is controlled according to the formula

[0104] Further, if the internal resistance value is excessive but the temperature rise rate η is not excessive, it is further determined in each SOC interval whether the actual charging voltage is less than the voltage calibration value corresponding to each SOC interval or less than the upper limit cutoff voltage corresponding to each SOC interval. If yes, the charging of all the battery cells is controlled according to the formula i = i0- a'·k1·η + g'·k3·U in each SOC interval until the temperature rise rate η is not excessive. Wherein a' and g' are weights, and a' + g' = 1.

[0105] If no, the charging of all the battery cells is controlled according to the formula i = i0- a'·k1·η + g'·k3·U in each SOC interval until the temperature rise rate η is not excessive. It is worth noting that after the temperature rise rate η is not excessive and the internal resistance value is not excessive, the charging adjustment logic when both the temperature rise rate η and the internal resistance value are not excessive is dynamically adjusted.

[0106] ​​​​controlling charging of all the cells in the battery until the internal resistance value is not over the limit. Wherein, β' and γ" are weights, β' + γ" = 1.

[0107] If not, in each SOC interval, the charging is adjusted according to the formula controlling charging of all the cells in the battery until the internal resistance value is not over the limit.

[0108] It is worth noting that when the temperature rise rate η is not over the limit and the internal resistance value is not over the limit, the charging is dynamically adjusted according to the charging adjustment logic when both are not over the limit.

[0109] In the second aspect, based on the same inventive concept as the charging control method of super-fast charging provided in the first aspect, the embodiments of the present application also provide a charging control system of super-fast charging. Referring to Figure 2 , the system comprises:

[0110] A first monitoring module 201 is configured to monitor whether the temperature rise rate and the internal resistance value of the battery during super-fast charging are over the limit in real time.

[0111] A second monitoring module 202 is configured to monitor whether the voltage difference between each cell voltage in the battery is over the limit or the voltage difference between the calibrated charging voltage and the actual voltage of each cell is over the limit if both are not over the limit.

[0112] An adjustment module 203 is configured to increase the charging of all the cells in the battery by fitting a charging supplementary current according to the over-limit voltage difference and adding the charging supplementary current to the original charging current if any voltage difference is over the limit. Wherein, the over-limit voltage difference is positively correlated with the charging supplementary current.

[0113] It should be noted that the charging control system of super-fast charging provided in the embodiments of the present application, wherein the specific manner of operation of each module has been described in detail in the method embodiments provided in the first aspect, and the specific implementation process can refer to the method embodiments provided in the first aspect, which will not be described in detail here.

[0114] In the third aspect, based on the same inventive concept as the charging control method of super-fast charging provided in the first aspect, the embodiments of the present application also disclose a computer readable storage medium having a computer program stored thereon, which is executed by a processor to implement the steps of any of the methods described above.

[0115] In a fourth aspect, based on the same inventive concept of the super-fast charging control method provided in the first aspect, the application further discloses a new energy vehicle, comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and the processor executes the program to implement the steps of any of the above methods.

[0116] Although preferred embodiments of the application have been described, those of ordinary skill in the art can make additional alterations and modifications to these embodiments once they have been informed of the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including all of the preferred embodiments and all of the alterations and modifications falling within the scope of the application.

[0117] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A super fast charging control method, characterized in that: The method comprises: Real-time monitoring of the battery's temperature rise rate and internal resistance during super-fast charging to see if they exceed the standard; If both exceed the standard, according to the formula Comprehensively control the charging of all cells in the battery; wherein i is the final charging current, i0 is the original charging current, η is the heating rate, k1 is the adjustment factor fitted according to the heating rate, k1 and the heating rate are positively correlated, is the internal resistance value, k2 is the adjustment factor fitted according to the internal resistance value, k2 is positively correlated with the internal resistance value, U is the actual charging voltage, k3 is the adjustment factor fitted according to the actual charging voltage, and is positively correlated with the actual charging voltage. When the actual charging voltage U is less than the voltage calibration value corresponding to each SOC interval, the original charging current is increased; when the actual charging voltage U is greater than the voltage calibration value corresponding to each SOC interval, the original charging current is reduced. α, β, and γ are weights, and α+β+γ=1; If none of the above conditions are met, monitoring whether the voltage difference between the cell voltages in the battery exceeds the standard, or whether the voltage difference between the calibrated charging voltage and the actual voltage corresponding to each cell exceeds the standard; If any voltage difference value exceeds the standard, a charging supplementary current is fitted according to the exceeded voltage difference value, and the charging supplementary current is increased on the basis of the original charging current to increase the charging of all cells in the battery; wherein the exceeded voltage difference value is positively correlated with the charging supplementary current.

2. The method according to claim 1, wherein If multiple voltage difference values ​​exceed the standard, the charging supplementary current is fitted according to the maximum value of the exceeded voltage difference values.

3. The method according to claim 1, wherein If none of the standards are exceeded, the method further comprises: Monitoring a change in a voltage difference between the battery cell voltages, or a change in a voltage difference between a rated charging voltage and an actual voltage corresponding to each battery cell; If the change in the pressure difference value indicates that the pressure difference value gradually increases over time, fitting the charging supplementary current according to the pressure difference increase value, and increasing the charging supplementary current on the basis of the original charging current to increase charging of all cells in the battery; the charging supplementary current is positively correlated with the pressure difference increase value; If the change in the voltage difference value indicates that the voltage difference value gradually decreases over time, the charging reduction current is fitted according to the voltage difference reduction value, and the charging reduction current is reduced on the basis of the original charging current to reduce the charging of all cells in the battery; or the original charging current is kept unchanged for charging.

4. The method according to claim 1, wherein If none of the standards are exceeded, the method further comprises: Monitoring whether the charge growth rate of each battery cell exceeds the calibrated growth rate corresponding to each SOC charge interval; In each SOC charge interval, if the charge growth rate does not exceed the calibrated growth rate, fitting the charging supplementary current according to the charge growth rate, and increasing the charging supplementary current on the basis of the original charging current to increase charging of all cells in the battery; In each SOC charge interval, if the charge growth rate exceeds the calibrated growth rate, the charging reduction current is fitted according to the charge growth rate, and the charging reduction current is reduced based on the original charging current to reduce the charging of all cells in the battery.

5. The method according to claim 1, wherein After real-time monitoring of whether the temperature rise rate and internal resistance of the battery during super-fast charging exceed the standard, the method further includes: If the heating rate exceeds the standard, the charging of all cells in the battery is controlled according to the formula i=i0-k1·η.

6. The method according to claim 1, wherein After real-time monitoring of whether the temperature rise rate and internal resistance of the battery during super-fast charging exceed the standard, the method further includes: If the internal resistance exceeds the standard, according to the formula Controlling the charging of all cells in the battery.

7. A super fast charging control system, characterized in that: The system comprises: The first monitoring module is used to monitor in real time whether the battery's temperature rise rate and internal resistance value exceed the standard during super-fast charging; Comprehensive control module, used to if all exceed the standard, according to the formula Comprehensively control the charging of all cells in the battery; wherein i is the final charging current, i0 is the original charging current, η is the heating rate, k1 is the adjustment factor fitted according to the heating rate, k1 and the heating rate are positively correlated, is the internal resistance value, k2 is the adjustment factor fitted according to the internal resistance value, k2 is positively correlated with the internal resistance value, U is the actual charging voltage, k3 is the adjustment factor fitted according to the actual charging voltage, and is positively correlated with the actual charging voltage. When the actual charging voltage U is less than the voltage calibration value corresponding to each SOC interval, the original charging current is increased; when the actual charging voltage U is greater than the voltage calibration value corresponding to each SOC interval, the original charging current is reduced. α, β, and γ are weights, and α+β+γ=1; A second monitoring module is used to monitor whether the voltage difference between the voltages of the battery cells in the battery exceeds the standard, or whether the voltage difference between the calibrated charging voltage and the actual voltage corresponding to each battery cell exceeds the standard if none of the voltages exceed the standard; The adjustment module is used to fit a charging supplementary current according to the excessive pressure difference value if any pressure difference value exceeds the standard, and increase the charging supplementary current on the basis of the original charging current to increase the charging of all cells in the battery; wherein the excessive pressure difference value is positively correlated with the charging supplementary current.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A new energy vehicle comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method according to any one of claims 1 to 6 are implemented.

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