CN115549225A - Battery charging and discharging current-limiting control method and battery management system - Google Patents

Battery charging and discharging current-limiting control method and battery management system Download PDF

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Publication number
CN115549225A
CN115549225A CN202110737434.XA CN202110737434A CN115549225A CN 115549225 A CN115549225 A CN 115549225A CN 202110737434 A CN202110737434 A CN 202110737434A CN 115549225 A CN115549225 A CN 115549225A
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current
battery
value
current limiting
battery string
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尹韶文
林培锦
尹雪芹
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BYD Co Ltd
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BYD Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00036—Charger exchanging data with battery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4285—Testing apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

A battery charging and discharging current-limiting control method and a battery management system are provided, wherein the battery charging current-limiting control method comprises the following steps: detecting charging parameters in the battery string, wherein the charging parameters comprise the instant current in the battery string and the highest voltage in the voltages of the single batteries included in the battery string; acquiring a preset current limiting regulation data table, wherein the preset current limiting regulation data table comprises a plurality of current limiting values and trigger voltage values corresponding to the current limiting values; determining one of the current limiting values which is closest to the instantaneous current as a comparison current limiting value; determining a trigger voltage value corresponding to the comparison current limiting value as a comparison voltage value; when the highest voltage is greater than or equal to the comparison voltage value, determining the instant electric quantity of the battery string, and performing current-limiting regulation; after the current-limiting adjustment, when the electric quantity of the battery string reaches the instant electric quantity, the current-limiting adjustment is released. The method and the device dynamically and reasonably adjust the current limit value of the battery string, and always provide the battery limit value which can not reach the extreme value of a single battery and is close to the maximum current capability.

Description

Battery charging and discharging current-limiting control method and battery management system
Technical Field
The application relates to the technical field of battery charging and discharging, in particular to a battery charging and discharging current-limiting control method and a battery management system.
Background
The existing methods for fully charging and emptying the battery strings mainly comprise the following steps: 1) Carrying out current-limiting charging and discharging according to the characteristics of the single battery; 2) Charging and discharging according to constant current-constant voltage; 3) The power control system regulates with the allowable charging and discharging current of the battery.
For the method 1), the battery manufacturer can limit the current of the given current limiting table according to the current limiting charging and discharging of the single battery. However, in a battery pack with a plurality of batteries connected in series, the conditions of each single battery are inconsistent, and therefore, at the end of charging, protection is performed when the extreme value (the highest voltage or the lowest voltage) of a certain single battery is reached, and at this time, a current limit value given by a manufacturer is large, so that a current given by a Power Control System (PCS) is large, a large current triggers protection to stop, and the electric quantity is not completely full.
With regard to the above method 2), the method is applicable only to a single battery or a battery pack with extremely good balance; when the method is applied to an actual battery pack, because each single battery of the batteries connected in series has a voltage difference, the voltage of the total voltage is not simply constant by multiplying the protection voltage by the number of the nodes, and any fixed constant voltage value can cause overcharge or overdischarge of a certain single battery in the batteries.
For the method 3), the current can be operated in the maximum charging and discharging current without complex regulation function, the current capacity is controlled by the battery manager, and the actual working condition of the input and output current is processed by the power control system according to the actual condition. Such as by the power system regulation, upon reaching the single extreme value given by the battery, can cause the risk of constant triggering of the single extreme value, as well as current fluctuations.
Disclosure of Invention
The present application has been made to solve at least one of the above problems. According to an aspect of the present application, there is provided a battery charging current limiting control method, the method including: detecting a charging parameter in a battery string, wherein the charging parameter comprises an instant current in the battery string and the highest voltage in voltages of each single battery included in the battery string; acquiring a preset current limiting regulation data table, wherein the preset current limiting regulation data table comprises a plurality of current limiting values and trigger voltage values corresponding to the current limiting values; determining one of the current limiting values that is closest to the instantaneous current as a comparative current limiting value; determining a trigger voltage value corresponding to the comparison current limiting value as a comparison voltage value; when the highest voltage is greater than or equal to the comparison voltage value, determining the instant electric quantity of the battery string, and performing current limiting regulation; after the current limiting adjustment, releasing the current limiting adjustment when the electric quantity of the battery string reaches the instant electric quantity; wherein the current limit adjustment comprises: determining one of the plurality of restriction values that is closest to and less than the comparative restriction value as an adjusted restriction value; adjusting the instantaneous current to the adjusted current limit value; and updating the comparison voltage value according to the regulated highest voltage in the voltages of the single batteries included in the battery string and the regulated maximum constraint voltage of the single batteries included in the battery string.
In one embodiment of the present application, the plurality of current limiting values in the preset current limiting adjustment data table are determined according to a maximum charging current, a nominal current and a current adjustment step size.
In one embodiment of the present application, the current adjustment step is equal to a product of the maximum charging current and a preset percentage.
In one embodiment of the present application, the preset percentage is between 5% and 10%.
In an embodiment of the application, the updating the comparison voltage value according to the adjusted highest voltage of the voltages of the single batteries included in the battery string and the maximum constraint voltage of the single batteries included in the battery string includes: calculating the difference between the highest voltage in the voltages of the single batteries included in the battery string after adjustment and the comparison voltage value; calculating the product of the difference and a preset coefficient, wherein the preset coefficient is less than 1; and calculating the difference value of the maximum constraint voltage and the product to serve as an updated comparison voltage value.
According to another aspect of the present application, there is provided a battery discharge current limiting control method, the method including: detecting a discharge parameter in a battery string, wherein the discharge parameter comprises an instant current in the battery string and the lowest voltage in voltages of each single battery included in the battery string; acquiring a preset current limiting regulation data table, wherein the preset current limiting regulation data table comprises a plurality of current limiting values and trigger voltage values corresponding to the current limiting values; determining one of the current limiting values which is closest to the instantaneous current as a comparative current limiting value; determining a trigger voltage value corresponding to the comparison current limiting value as a comparison voltage value; when the lowest voltage is less than or equal to the comparison voltage value, determining the instant electric quantity of the battery string, and performing current limiting regulation; after the current limiting adjustment, releasing the current limiting adjustment when the electric quantity of the battery string reaches the instant electric quantity; wherein the current limit adjustment comprises: determining one of the plurality of restriction values that is closest to and less than the comparative restriction value as an adjusted restriction value; adjusting the instantaneous current to the adjusted current limit value; and updating the comparison voltage value according to the regulated lowest voltage in the voltages of the single batteries included in the battery string and the regulated minimum constraint voltage of the single batteries included in the battery string.
In one embodiment of the present application, the plurality of current limiting values in the preset current limiting adjustment data table are determined according to a maximum discharge current, a nominal current and a current adjustment step size.
In one embodiment of the present application, the current adjustment step is equal to a product of the maximum discharge current and a preset percentage.
In one embodiment of the present application, the preset percentage is between 5% and 10%.
According to still another aspect of the present application, there is provided a battery management system including a battery string, a control unit, and a detection module, wherein: the control unit is used for detecting the charging parameters in the battery string through the detection module, and the battery charging current limiting control method is used.
According to still another aspect of the present application, there is provided a battery management system including a battery string, a control unit, and a detection module, wherein: the control unit is used for detecting the discharge parameters in the battery string through the detection module so as to execute the battery discharge current limiting control method.
According to the battery charging and discharging current-limiting control method and the battery management system, a predictive current-reducing function is added on the basis of the basic current-limiting function of a battery system, and the current limit value of the battery is dynamically and reasonably adjusted under the original logic of constant-pressure full charging and emptying so as to ensure that the battery limit value which can not reach a single extreme value and is close to the maximum current capacity can be provided at any time; in addition, the method for adjusting the calibration parameters in real time is used for recording and comparing and adjusting the current and the electric quantity close to the extreme values in real time, so that the most effective current limit value and the current limit value curve decline are ensured to accord with the battery characteristics.
Drawings
The above and other objects, features and advantages of the present application will become more apparent from the following detailed description of the embodiments of the present application when taken in conjunction with the accompanying drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally indicate like parts or steps.
Fig. 1 shows a schematic flow chart of a battery charging current limiting control method according to an embodiment of the present application.
Fig. 2 shows a schematic flow chart of a battery discharge current limit control method according to an embodiment of the present application.
Fig. 3 shows a schematic flow chart diagram of a battery charging and discharging current limiting control method according to an embodiment of the application.
Fig. 4 shows a schematic block diagram of a battery management system according to an embodiment of the application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, exemplary embodiments according to the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and that the present application is not limited by the example embodiments described herein. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the application described in the application without inventive step, shall fall within the scope of protection of the application.
The battery string is a whole formed by connecting a plurality of single batteries in series, is displayed to the outside as a whole, and takes the protection of each single battery into consideration. On the other hand, the independence of the battery system and the power system, that is, the control of the charge and discharge current, is performed in the power system, and the battery system is protected. The situation inevitably has the voltage protection of a certain single battery in the high-current trigger battery string, or the current is limited in advance to avoid the high-current trigger protection, the system capacity is limited, and the full-charging and emptying time is increased. Meanwhile, the individual difference of each single battery in the battery string, the individual difference of each battery string and the aging condition also cause that the conditions can not be completely met only by presetting according to early experimental data. According to the requirements of the energy storage system, the battery management system needs to calculate the current limit value (real-time current charging and discharging capacity) which accords with the actual condition according to the algorithm of the battery management system so as to meet the application of the energy storage system. Due to the reasons, according to the limit value of a single battery, the full charge and the emptying of a large battery can be caused to solve the protection, so that the current cannot obtain the maximum use value; in the constant current-constant voltage method, constant voltage of a certain fixed value cannot be realized in a constant voltage stage due to the monomer difference of the batteries; and the linkage strategy of the power system and the battery system is adjusted, so that the system interaction complexity is high. Again, the risk of current jitter and single-section high voltage triggering occurs.
Based on the above, the application provides a battery charging and discharging current-limiting control method, which adds a predictive current-reducing function on the basic current-limiting function of a battery system, and dynamically and reasonably adjusts the battery current limit value under the original logic of constant-voltage full-charging and emptying so as to ensure that a battery limit value which can not reach a single extreme value and is close to the maximum current capacity can be provided at any time; in addition, the method for adjusting the calibration parameters in real time is used for recording and comparing and adjusting the current and the electric quantity close to the extreme values in real time, so that the most effective current limit value and the current limit value curve decline are ensured to accord with the battery characteristics. The following is described in connection with fig. 1 and 2 in terms of both charging and discharging, respectively.
Fig. 1 shows a schematic flow diagram of a battery charge current limit control method 100 according to an embodiment of the application. As shown in fig. 1, a battery charging current limiting control method 100 according to an embodiment of the present application may include the following steps:
in step S110, a charging parameter in a battery string is detected, where the charging parameter includes an instantaneous current in the battery string and a highest voltage among voltages of individual batteries included in the battery string.
In step S120, a preset current limit adjustment data table is obtained, where the preset current limit adjustment data table includes a plurality of current limit values and trigger voltage values corresponding to each current limit value.
In step S130, one of the plurality of current limiting values that is closest to the instantaneous current is determined as a comparative current limiting value.
In step S140, a trigger voltage value corresponding to the comparative current limiting value is determined as a comparative voltage value.
In step S150, when the maximum voltage is greater than or equal to the comparison voltage value, determining the instant electric quantity of the battery string, and performing current-limiting adjustment. Wherein the current limit adjustment comprises: determining one of the plurality of restriction values that is closest to and less than the comparative restriction value as an adjusted restriction value; adjusting the instantaneous current to the adjusted current limit value; and updating the comparison voltage value according to the regulated highest voltage in the voltages of the single batteries included in the battery string and the regulated maximum constraint voltage of the single batteries included in the battery string.
In step S160, after the current limiting adjustment, when the electric quantity of the battery string reaches the instant electric quantity, the current limiting adjustment is released.
In an embodiment of the present application, a current limiting adjustment data table is first created, where the data table includes a plurality of current limiting values and trigger voltage values corresponding to each current limiting value. The plurality of current limiting values are current values to which the charging current is limited in the charging process, and the trigger voltage value is a trigger voltage value which triggers the charging current to be limited. The plurality of current limiting values in the data table are determined according to the maximum charging current allowed by the battery string, the nominal current and the current adjusting step length, and the trigger voltage value in the data table is a voltage value close to (smaller than) the maximum constraint voltage of the single battery under the corresponding charging current (current limiting value). In addition, the initial values of the trigger voltage values in the data table are data configured according to experimental test data, and the data can be updated according to the current limiting adjustment result.
In the embodiment of the present application, the data table described above functions to: when the instant current (charging current) in the battery string approaches a current limiting value (the current limiting value is referred to as a comparative current limiting value) in the data table, and the highest voltage in the voltages of the single batteries in the battery string approaches (is greater than or equal to) a trigger voltage value (the voltage value is referred to as a comparative voltage value) corresponding to the current limiting value, the current limiting adjustment is started, namely, the instant current in the battery string is limited to the current limiting value which is closest to the comparative current limiting value and is less than the comparative current limiting value in the data table, and the comparative voltage value is adjusted (updated) based on the current limiting result. For example, the multiple restriction values are I1, I2, I3, \8230;, in, where n is a natural number greater than 1; the trigger voltage values corresponding to I1, I2, I3, 8230, V1, V2, V3, 8230, and Vn. Assuming that I1 to In are In a descending order, i.e. I1 is smaller than I2, I2 is smaller than I3, \ 8230; \ 8230;, in-1 is smaller than In, and assuming that the instantaneous current In the battery string is closest to I3 and the highest voltage among the voltages of the individual batteries In the battery string is greater than or equal to V3 at this time, current limiting adjustment is started, i.e. the instantaneous current In the battery string is limited to I2, while the value of V3 is adjusted (updated) based on the current limiting result.
Therefore, based on the function of the current-limiting adjustment data table, in the embodiment of the present application, the charging parameters in the battery string are monitored according to the preset current-limiting adjustment data table, including monitoring the instantaneous current in the battery string and the highest voltage of the voltages of the individual batteries included in the battery string; determining a current limiting value closest to the instant current in the data table as a comparison current limiting value, wherein a trigger voltage value corresponding to the comparison current limiting value is a comparison voltage value; when the highest voltage in the voltages of the single batteries in the battery string is greater than or equal to the comparison voltage value, performing current limiting regulation, wherein the current limiting regulation comprises the following steps: and determining a current limiting value which is closest to the comparison current limiting value and smaller than the comparison current limiting value in the data table as an adjustment current limiting value, adjusting the instant current to the adjustment current limiting value, and updating the comparison voltage value according to the highest voltage in the voltages of the single batteries included in the adjusted battery string and the maximum constraint voltage of the single batteries included in the battery string. In addition, when the highest voltage in the voltages of the single batteries in the battery string is greater than or equal to the comparison voltage value, the instant electric quantity of the battery string is recorded, the instant electric quantity is taken as a basis, when the electric quantity of the battery string after current limiting adjustment reaches the instant electric quantity, the current limiting adjustment is finished, and the current limiting adjustment is released.
In the embodiment of the present application, since the trigger voltage value in the data table is a voltage value close to (smaller than) the maximum constraint voltage of the single battery at the corresponding charging current (current limit value), when the maximum voltage of the single battery is close to (greater than or equal to) a certain trigger voltage value in the data table during charging, it indicates that the single battery is about to reach the maximum constraint voltage and may trigger protection to stop charging. In addition, after adjustment, the comparison voltage value is updated according to the highest voltage of the voltages of the single batteries of the battery string and the maximum constraint voltage of the single batteries of the battery string, namely, the initial value in the data table is optimized and corrected according to the adjusted effect feedback, so that the trigger voltage value in the data table is more consistent with the characteristics of the batteries, more accurate reference is provided for the current limiting adjustment later, and the adjusting effect is ensured. In addition, when the current limiting adjustment is determined, the instant electric quantity (SOC) of the battery string is recorded firstly, the instant electric quantity can also be recorded in the data table and is used as the electric quantity corresponding to the adjustment current limiting value, after the current limiting adjustment, the current limiting adjustment is released when the electric quantity of the battery string reaches the previously recorded instant electric quantity according to the previously recorded instant electric quantity. Since the current and the voltage are changed before and after the current limiting adjustment, the time for releasing the current limiting adjustment is more accurate based on the instant electric quantity.
In an embodiment of the present application, the plurality of current limiting values in the preset current limiting adjustment data table may be determined according to the maximum charging current, the nominal current, and the current adjustment step size. For example, the first current limit value may be a nominal current value; the second current limit value may be the result of the nominal current value plus the current adjustment step size; the third current limit value may be the result of the second current limit value plus the current adjustment step size, and so on. The total number of current limit values may be determined based on the maximum charging current, the nominal current, and the current adjustment step size. For example, the total number may be equal to the maximum charging current minus the nominal current, and the difference is divided by the current adjustment step size, and the rounded value is the total number of the current limiting values. If the current adjusting step length is too small, the table length is increased, namely, the storage amount and the retrieval are increased, so that more memories and calculated amounts are used; the current adjusting step length is too large, so that the adjusting effect is poor, too much current is reduced by one-time adjustment, and the adjusting effect cannot be achieved. In an embodiment of the present application, the current adjustment step size may be equal to a product of the maximum charging current and a preset percentage. For example, the preset percentage may be between 5% and 10%, that is, a maximum allowable current of 5% -10% may be selected as the current adjustment step.
In an embodiment of the present application, updating the comparative voltage value according to the highest voltage among the voltages of the single batteries included in the adjusted battery string and the maximum constraint voltage of the single batteries included in the battery string may include: calculating the difference between the highest voltage of the voltages of the single batteries included in the adjusted battery string and the comparison voltage value; calculating the product of the difference value and a preset coefficient, wherein the preset coefficient is less than 1; and calculating the difference value of the maximum constraint voltage and the product to serve as an updated comparison voltage value.
The battery charging current limiting control method according to the embodiment of the present application is described below with reference to specific examples.
In one example, the maximum charging current is 200A (amperes), the nominal current (the constant current used when the current tests the nominal charge) is 50A, the current adjustment step size is 10% of the maximum charging current, i.e., 20A, then the number of current limit values in the preset current limit adjustment data table is 8, which is calculated by (200A-50A)/20a =7.5, rounding up to 8, and these current limit values are 50A, 70A, 90A, 110A, 130A, 150A, 170A, and 190A, respectively. And 50A is the minimum current limiting value, and when the highest voltage in the voltages of the single batteries in the battery string reaches the corresponding trigger voltage value, no further current is limited.
In addition, the initial value of each trigger voltage in the preset current limit adjustment data table can be set by considering the maximum constraint voltage of the single battery and the response speed of the power control system. The higher the trigger voltage value is set, the maximum utilization of the battery can be achieved, but the high setting can cause the high voltage to be generated when the power control system is not processing, for example, the maximum constraint voltage value is 3.6V, when the trigger voltage value is set to 3.599V when the minimum current limit value (50A) is used for charging, the power control system has no response, and the voltage is already charged to 3.6V or higher (the voltage change is mainly a regulating factor, for example, the power regulation is very fast, the sampling period is very fast, and the default is 3.599V).
In the embodiment of the application, the trigger voltage value corresponding to each current limiting value is set according to experimental data. Specifically, if the current is near a current limit value I (Tn), at which point the voltage reaches a trigger voltage value V (Tn), the amount of power may be recorded, decreasing the current limit value. If the maximum constraint voltage V (h) is triggered after the reduction (related to the response regulation speed of the power control system), namely the trigger voltage value is too large (the difference value between the trigger voltage and the maximum constraint voltage (high-voltage protection value) is small, the buffering is less, and the processing time for the power control system is less); if the high voltage is not triggered after the reduction, during which the highest voltage in the single cell is V (h '), then V (Tn) can be optimized to be V (Tn)', V (Tn ') = V (h) - (V (h') -V (Tn))/α, where α is a factor less than 1, e.g., α =2/3, indicating that the overshoot voltage position during the power control system regulation after current limiting is designed to be two-thirds of the trigger voltage value V (Tn) and the maximum restraint voltage V (h), where α is the adjustable parameter. Assuming that the theoretical time of the power control system responding to the power down is 4 seconds, the voltage value of the first 6 seconds (two thirds of the set theoretical position is occupied by) when the power control system is filled to 3.6V according to different multiplying factors (4/2 x 3-4=2, namely 2 seconds are added as a buffer) can be used as the initial trigger voltage value in the preset current limiting regulation data table. From the above, an example of a preset current limit adjustment data table may be generated, see table 1.
TABLE 1
I(T1):50A V(T1):3.590V Q (T1) instant recording SOC
I(T2):70A V(T2):3.585V Q (T2) instant recording of SOC
I(T3):90A V(T3):3.581V Q (T3) instant recording of SOC
I(T4):110A V(T4):3.575V Q (T4) instant recording SOC
I(T5):130A V(T5):3.568V Q (T5) instant recording of SOC
I(T6):150A V(T6):3.550V Q (T6) instant recording of SOC
I(T7):170A V(T7):3.542V Q (T7) instant recording of SOC
I(T8):190A V(T8):3.523V Q (T8) instant recording SOC
In table 1 above, the current limit value is determined according to the maximum charging current, the nominal current and the current regulation step, the trigger voltage value is determined according to experiments, and the instantaneous recording SOC is the real-time recorded electric quantity at the time of triggering the current limit regulation as described above.
The charging current limit adjustment process according to table 1 is described below with reference to a specific example. In one example, at a certain time, the maximum charging current is I (limit) =200A, the instantaneous current in the battery string is I (t) =135A in actual operation, the instantaneous power SOC is Q (t) =98.23%, and the maximum voltage in a single battery in the battery string reaches V (t) =3.568V. Comparing the Table 1, judging the current 135A, selecting I (T5) in the Table, namely data in 130A for comparison (the difference value is closest), taking 5 as n, and taking out Table (5); comparative surface-to-interior voltage V (Tn): and judging whether V (Tn) is more than or equal to V (t), if so, limiting the limit value, and if not, ending. V (T5) =3.568V, and the voltage at this moment is also V (T) =3.568V, so limit limiting is performed to the previous current, I (T4) 110A; assignment I (limit) =110A and Q (Tn-1) = Q (t) =98.23%, i.e., table 1 is updated to table 2:
TABLE 2
I(T1):50A V(T1):3.590V Q (T1) instant recording SOC
I(T2):70A V(T2):3.585V Q (T2) instant recording SOC
I(T3):90A V(T3):3.581V Q (T3) instant recording SOC
I(T4):110A V(T4):3.575V Q(T4):98.23％
I(T5):130A V(T5):3.568V Q (T5) instant recording SOC
I(T6):150A V(T6):3.550V Q (T6) instant recording of SOC
I(T7):170A V(T7):3.542V Q (T7) instant recording SOC
I(T8):190A V(T8):3.523V Q (T8) instant recording SOC
In addition, V (Tn) is adjusted and updated through the effect after current limiting adjustment. Specifically, the battery management system sets the new limit value I (limit) to 110A, at which time I (t) > I (limit); the power control system receives the new current limiting value and starts to adjust; as a result of the regulation, the current starts to change, the voltage starts to change; and (5) completing the regulation, wherein I (t) is less than or equal to I (limit). The elapsed time is determined by the communication and regulation rate. Depending on the smoothness requirements of the items, for example, assume a 30 second time window for the adjusted determination. And (3) setting the voltage proportion parameter to be two thirds of the position, recording the highest voltage value of the single battery as V (h') in the time window, and updating the trigger voltage value as follows: v (Tn ') = V (h) - (V (h') -V (Tn))/2 x 3. In the above example, V (T5), corresponding to 130A, will be updated to V (T5'). After the current limiting adjustment, the current limiting release is required to be carried out at a certain moment, and as mentioned above, the reference is the electric quantity value Q (Tn-1) stored in the meter immediately at the current limiting moment.
Based on the above description, the current-limiting control method for battery charging according to the embodiment of the present application dynamically controls the charging current to be used to the maximum extent, based on the specific operation condition of the battery. In addition, according to the automatic regulation principle, the trigger voltage value is fed back and corrected to ensure the adaptation to the actual working condition of the battery. Due to the fact that the idea of software control and data adjustment is utilized, the real-time available current of the battery is displayed, and therefore the battery management system has the important characteristics of being high in availability, strong in applicability, low in coupling with other systems and the like. Furthermore, effective limitation is carried out on the voltage reaching the extreme value, the realization Of the algorithm on other indexes Of the battery management system can be facilitated, for example, the current and the current Of a nominal test can be enabled to be closer to the algorithm for helping the realization Of the State Of Health (SOH) Of the battery or improving the accuracy, the change Of each data State in the adjustment process can be fed back to be used as the optimization Of SOC algorithm estimation, and meanwhile, certain auxiliary effects such as balance, thermal management and the like can be achieved.
The following describes the battery discharging current limiting control method according to the embodiment of the present application with reference to fig. 2, and since charging and discharging are mirrored, only some main outlines are described in the embodiment of the battery discharging current limiting control method, and details thereof may be similar to those of the battery charging current limiting control method described above and are not repeated.
Fig. 2 shows a schematic flow diagram of a battery discharge current limit control method 200 according to an embodiment of the present application. As shown in fig. 2, the battery discharging current limiting control method 200 includes the following steps:
in step S210, a discharging parameter in a battery string is detected, where the discharging parameter includes an instantaneous current in the battery string and a lowest voltage of voltages of individual batteries included in the battery string.
In step S220, a preset current limit adjustment data table is obtained, where the preset current limit adjustment data table includes a plurality of current limit values and trigger voltage values corresponding to each current limit value.
In step S230, one of the plurality of current limiting values that is closest to the instantaneous current is determined as a comparative current limiting value.
In step S240, a trigger voltage value corresponding to the comparative current limiting value is determined as a comparative voltage value.
In step S250, when the lowest voltage is less than or equal to the comparison voltage value, determining the instant electric quantity of the battery string, and performing current limiting adjustment. Wherein the current limit adjustment comprises: determining one of the plurality of restriction values that is closest to and less than the comparative restriction value as an adjusted restriction value; adjusting the instantaneous current to the adjusted current limit value; and updating the comparison voltage value according to the regulated lowest voltage in the voltages of the single batteries included in the battery string and the regulated minimum constraint voltage of the single batteries included in the battery string.
In step S260, after the current limiting adjustment, when the electric quantity of the battery string reaches the instant electric quantity, the current limiting adjustment is released.
In the embodiment of the application, a current limiting regulation data table is firstly created, and the data table comprises a plurality of current limiting values and trigger voltage values corresponding to each current limiting value. The plurality of current limiting values are current values to which the discharge current is limited in the discharge process, and the trigger voltage value is a trigger voltage value which triggers the current limiting of the discharge current. The plurality of current limiting values in the data table are determined according to the maximum discharge current, the nominal current and the current adjusting step size, and the trigger voltage value in the data table is a voltage value close to (larger than) the minimum constraint voltage of the single battery under the corresponding discharge current (current limiting value). In addition, the initial values of the trigger voltage values in the data table are data configured according to experimental test data, and the data can be updated according to the current limiting adjustment result.
In the embodiment of the present application, the data table described above functions to: when the instant current (discharge current) in the battery string approaches a current limiting value (the current limiting value is referred to as a comparative current limiting value) in the data table, and the lowest voltage in the voltages of the single batteries in the battery string approaches (is less than or equal to) a trigger voltage value (the voltage value is referred to as a comparative voltage value) corresponding to the current limiting value, the current limiting adjustment is started, namely, the instant current in the battery string is limited to the current limiting value which is closest to the comparative current limiting value and is less than the comparative current limiting value in the data table, and the comparative voltage value is adjusted (updated) based on the current limiting result.
Therefore, based on the function of the current-limiting adjustment data table, in the embodiment of the present application, the discharge parameters in the battery string are monitored according to the preset current-limiting adjustment data table, including monitoring the instantaneous current in the battery string and the lowest voltage of the voltages of the single batteries included in the battery string; determining a current limiting value closest to the instant current in the data table as a comparison current limiting value, wherein a trigger voltage value corresponding to the comparison current limiting value is a comparison voltage value; when the lowest voltage of the voltages of the single batteries included in the battery string is less than or equal to the comparison voltage value, performing current limiting regulation, wherein the current limiting regulation comprises the following steps: and determining a current limiting value which is closest to the comparison current limiting value and smaller than the comparison current limiting value in the data table as an adjustment current limiting value, adjusting the instant current to the adjustment current limiting value, and updating the comparison voltage value according to the lowest voltage in the voltages of the single batteries included in the adjusted battery string and the minimum constraint voltage of the single batteries included in the battery string. In addition, when the lowest voltage of the voltages of the single batteries in the battery string is less than or equal to the comparison voltage value, recording the instant electric quantity of the battery string, and when the electric quantity of the battery string after current limiting adjustment reaches the instant electric quantity, finishing the current limiting adjustment and releasing the current limiting adjustment by taking the instant electric quantity as a basis.
In the embodiment of the present application, since the trigger voltage value in the data table is a voltage value close to (greater than) the minimum constraint voltage of the single battery under the corresponding discharge current (current limit value), when the minimum voltage of the single battery is close to (less than or equal to) a certain trigger voltage value in the data table during the discharge process, it indicates that the single battery is about to reach the minimum constraint voltage and may trigger protection to stop discharging, in this case, the current limit control method according to the embodiment of the present application reduces the discharge current by one step, and limits the discharge current to a current value slightly smaller than the current limit value corresponding to the trigger voltage value to perform discharging, so as to prevent the single battery from reaching the minimum constraint voltage quickly, and thus a battery limit value that does not reach the single extreme value and is close to the maximum current capacity can be provided. In addition, after adjustment, the comparison voltage value is updated according to the lowest voltage of the voltages of the single batteries of the battery string and the minimum constraint voltage of the single batteries of the battery string, namely, the initial value in the data table is optimized and corrected according to the adjusted effect feedback, so that the trigger voltage value in the data table is more consistent with the characteristics of the batteries, more accurate reference is provided for the current limiting adjustment later, and the adjusting effect is ensured. In addition, when the current limiting adjustment is determined, the instant electric quantity (SOC) of the battery string is recorded firstly, the instant electric quantity can also be recorded in the data table and is used as the electric quantity corresponding to the adjustment current limiting value, after the current limiting adjustment, the current limiting adjustment is released when the electric quantity of the battery string reaches the previously recorded instant electric quantity according to the previously recorded instant electric quantity. Because the current and the voltage are changed before and after the current limiting adjustment, the time for releasing the current limiting adjustment is more accurate by taking the instant electric quantity as the basis.
In an embodiment of the present application, the plurality of current limiting values in the preset current limiting adjustment data table may be determined according to the maximum discharge current, the nominal current, and the current adjustment step size. For example, the first current limit value may be a nominal current value; the second current limit value may be the nominal current value plus the current adjustment step size; the third current limit value may be the result of the second current limit value plus the current adjustment step size, and so on. The total number of current limit values may be determined from the maximum discharge current, the nominal current, and the current adjustment step size. For example, the total number may be equal to the maximum discharge current minus the nominal current, and the difference is divided by the current adjustment step size, and the rounded value is the total number of the current limiting values. If the current adjusting step length is too small, the table length is increased, namely, the storage amount and the retrieval are increased, so that more memories and calculated amounts are used; the current adjusting step length is too large, so that the adjusting effect is poor, too much current is reduced by one-time adjustment, and the adjusting effect cannot be achieved. In an embodiment of the present application, the current adjustment step may be equal to a product of the maximum discharge current and a preset percentage. For example, the preset percentage may be between 5% and 10%, that is, a maximum allowable current of 5% -10% may be selected as the current adjustment step.
Based on the above description, the battery discharge current limiting control method according to the embodiment of the present application dynamically controls the discharge current to be maximally used, based on the specific operation condition of the battery. In addition, according to the automatic regulation principle, the trigger voltage value is fed back and corrected to ensure the adaptation to the actual working condition of the battery. Due to the fact that the idea of software control and data adjustment is utilized, the real-time available current of the battery is displayed, and therefore the battery has the important characteristics of high availability, strong applicability, low coupling with other systems and the like. Furthermore, the extreme voltage is effectively limited, the implementation Of algorithms on other indexes Of the battery management system can be facilitated, for example, the current and the current Of a nominal test can be closer to the algorithm for facilitating the implementation Of the State Of Health (State Of Health, abbreviated as SOH) Of the battery or improving the accuracy, the change Of each data State in the adjustment process can be fed back to be used as the optimization Of the estimation Of the SOC algorithm, and meanwhile, certain auxiliary effects such as balance, thermal management and the like can be achieved.
Generally, according to the battery charging and discharging current-limiting control method provided by the embodiment of the application, when the voltage of a single battery string is close to an extreme value, current-limiting processing is performed, a preset current-limiting adjustment data table is used for judging and limiting the current, a new limit value is output, an operation effect is obtained in an effective time window for outputting the new current-limiting, and then current-limiting trigger time (trigger voltage value) is adjusted according to the operation effect. When the reverse current reaches the instant electric quantity, the release limit processing is carried out, and at this time, the new limit is promoted according to the data of the data table for storing the previous limit to obtain the new limit, and the whole process is shown in fig. 3. Therefore, according to the battery charging and discharging current-limiting control method provided by the embodiment of the application, a predictive current reduction function is added to the basic current-limiting function of a battery system, and the battery current limit value is dynamically and reasonably adjusted under the original logic of constant-voltage full charging and emptying so as to ensure that the battery limit value which cannot reach a single extreme value and is close to the maximum current capacity can be provided at any time; in addition, the method for adjusting the calibration parameters in real time is used for recording and comparing and adjusting the current and the electric quantity close to the extreme values in real time, so that the most effective current limit value and the current limit value curve decline are ensured to accord with the battery characteristics.
A battery management system 400 provided in accordance with another aspect of the present application is described below in conjunction with fig. 4. As shown in fig. 4, a battery management system 400 according to an embodiment of the present application includes a battery string 410, a control unit 420, and a detection module 430, wherein: the control unit 420 may be configured to detect the charging parameter in the battery string 410 via the detection module 430 to perform the battery charging current limiting control method 100 according to the embodiment of the present application described in conjunction with fig. 1; the control unit 420 may also be configured to detect a discharge parameter in the battery string 410 via the detection module 430 to perform the battery discharge current limiting control method 200 according to the embodiment of the present application described above in conjunction with fig. 2. Those skilled in the art can understand the structure and specific operations of the modules in the battery management system 400 according to the embodiment of the present application in combination with the foregoing descriptions, and for the sake of brevity, the descriptions are omitted here.
Based on the above description, the battery charging and discharging current-limiting control method and the battery management system according to the embodiment of the present application add a predictive current-reducing function to the basic current-limiting function of the battery system, and dynamically and reasonably adjust the battery current limit value under the original logic of constant-voltage full-charging and emptying, so as to ensure that a battery limit value which is not only not to reach a single extreme value but also close to the maximum current capacity is provided at any time; in addition, the method for adjusting the calibration parameters in real time is used for recording and comparing and adjusting the current and the electric quantity close to the extreme values in real time, so that the most effective current limit value and the current limit value curve decline are ensured to accord with the battery characteristics.
Although the example embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the above-described example embodiments are merely illustrative and are not intended to limit the scope of the present application thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as claimed in the appended claims.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another device, or some features may be omitted, or not executed.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the description of exemplary embodiments of the present application, various features of the present application are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the application and aiding in the understanding of one or more of the various inventive aspects. However, the method of this application should not be construed to reflect the intent: this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this application.
It will be understood by those skilled in the art that all of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where such features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
Various component embodiments of the present application may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some of the modules according to embodiments of the present application. The present application may also be embodied as apparatus programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present application may be stored on a computer readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
The above description is only for the specific embodiments of the present application or descriptions thereof, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and should be covered by the protection scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claims.

Claims (11)

1. A battery charging current limiting control method, the method comprising:
detecting a charging parameter in a battery string, wherein the charging parameter comprises an instant current in the battery string and the highest voltage in voltages of each single battery included in the battery string;
acquiring a preset current limiting regulation data table, wherein the preset current limiting regulation data table comprises a plurality of current limiting values and trigger voltage values corresponding to the current limiting values;
determining one of the current limiting values that is closest to the instantaneous current as a comparative current limiting value;
determining a trigger voltage value corresponding to the comparison current limiting value as a comparison voltage value;
when the highest voltage is greater than or equal to the comparison voltage value, determining the instant electric quantity of the battery string, and performing current limiting regulation;
after the current limiting adjustment, releasing the current limiting adjustment when the electric quantity of the battery string reaches the instant electric quantity;
wherein the current limit adjustment comprises:
determining one of the plurality of restriction values that is closest to and less than the comparative restriction value as an adjusted restriction value;
adjusting the instantaneous current to the adjusted current limit value;
and updating the comparison voltage value according to the regulated highest voltage in the voltages of the single batteries included in the battery string and the regulated maximum constraint voltage of the single batteries included in the battery string.
2. The method of claim 1, wherein the plurality of current limit values in the preset current limit adjustment data table are determined according to a maximum charging current, a nominal current, and a current adjustment step size.
3. The method of claim 2, wherein the current adjustment step is equal to the maximum charging current multiplied by a preset percentage.
4. The method according to claim 3, characterized in that said preset percentage is comprised between 5% and 10%.
5. The method according to claim 1, wherein the updating the comparison voltage value according to the adjusted highest voltage of the voltages of the single batteries included in the battery string and the maximum constraint voltage of the single batteries included in the battery string comprises:
calculating the difference value between the highest voltage in the voltages of the single batteries included in the battery string after adjustment and the comparison voltage value;
calculating the product of the difference value and a preset coefficient, wherein the preset coefficient is less than 1;
and calculating the difference value of the maximum constraint voltage and the product to serve as an updated comparison voltage value.
6. A battery discharge current limit control method, the method comprising:
detecting a discharge parameter in a battery string, wherein the discharge parameter comprises an instant current in the battery string and the lowest voltage in voltages of each single battery included in the battery string;
acquiring a preset current limiting regulation data table, wherein the preset current limiting regulation data table comprises a plurality of current limiting values and trigger voltage values corresponding to the current limiting values;
determining one of the current limiting values which is closest to the instantaneous current as a comparative current limiting value;
determining a trigger voltage value corresponding to the comparison current limiting value as a comparison voltage value;
when the lowest voltage is less than or equal to the comparison voltage value, determining the instant electric quantity of the battery string, and performing current limiting regulation;
after the current limiting adjustment, releasing the current limiting adjustment when the electric quantity of the battery string reaches the instant electric quantity;
wherein the current limit adjustment comprises:
determining one of the plurality of restriction values that is closest to and less than the comparative restriction value as an adjusted restriction value;
adjusting the instantaneous current to the adjusted current limit value;
and updating the comparison voltage value according to the regulated lowest voltage in the voltages of the single batteries included in the battery string and the regulated minimum constraint voltage of the single batteries included in the battery string.
7. The method of claim 6, wherein the plurality of current limit values in the preset current limit adjustment data table are determined according to a maximum discharge current, a nominal current, and a current adjustment step size.
8. The method of claim 7, wherein the current adjustment step is equal to the product of the maximum discharge current and a preset percentage.
9. The method according to claim 8, characterized in that said preset percentage is comprised between 5% and 10%.
10. A battery management system, comprising a battery string, a control unit, and a detection module, wherein:
the control unit is used for detecting the charging parameters in the battery string through the detection module so as to execute the battery charging current limiting control method in any one of claims 1-5.
11. A battery management system, comprising a battery string, a control unit, and a detection module, wherein:
the control unit is used for detecting a discharge parameter in the battery string through the detection module so as to execute the battery discharge current limiting control method of any one of claims 6-9.
CN202110737434.XA 2021-06-30 2021-06-30 Battery charging and discharging current-limiting control method and battery management system Pending CN115549225A (en)

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