CN113009346B - Battery system and SOC value correction method thereof - Google Patents
Battery system and SOC value correction method thereof Download PDFInfo
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- CN113009346B CN113009346B CN202110225151.7A CN202110225151A CN113009346B CN 113009346 B CN113009346 B CN 113009346B CN 202110225151 A CN202110225151 A CN 202110225151A CN 113009346 B CN113009346 B CN 113009346B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
Abstract
The application discloses a battery system and a SOC value correction method thereof, wherein the method comprises the following steps: acquiring a current voltage value of a battery and a preset voltage theoretical deviation value under the current condition; compensating the current voltage value according to the theoretical voltage deviation value to obtain a compensated compensation voltage value; when the battery enters the working state, determining the type of the working state of the battery, wherein the type of the working state comprises a charging state and a discharging state; and correcting the SOC value according to the type of the working state of the battery and the compensation voltage value. According to the embodiment of the application, the correction opportunity of the battery in the working process can be increased, the correction effect of the SOC value can be improved, and the estimation accuracy of the SOC can be further improved. In addition, the method and the device can eliminate the estimation error of the SOC value calculated by adopting the ampere-hour integration method due to the error of the current value in time, so that a subsequent system can estimate the SOC value more accurately.
Description
Technical Field
The present disclosure relates to power management, and particularly to a battery system and a method for correcting an SOC value thereof.
Background
In the field of battery management system technology, battery state of charge (SOC) is a very important parameter. SOC is the percentage of the remaining capacity and the rated capacity of the battery pack and is used to measure the current currently remaining in the battery pack. The accuracy of SOC directly influences the related strategy of BMS, and accurate SOC can effectively improve battery performance and battery life.
At present, the common SOC estimation methods in the industry include an open-circuit voltage method and an ampere-hour integration method. The open circuit voltage method has the disadvantage of requiring the battery pack to stand for a sufficiently long time. The ampere-hour integration method always accumulates errors due to errors of a battery sensor. Currently, the commonly used SOC correction methods include static OCV correction, dynamic OCV correction, full charge correction, low voltage correction, and the like.
The battery pack in the energy storage field usually runs between 20% and 90% of SOC, and the battery pack can run continuously, so that static correction, full correction and low-voltage correction have few chances, and the SOC can accumulate large errors. At present, the static correction usually needs to be carried out on the cell voltage which is kept still for more than 2 hours, the correction chance is less, jump occurs during SOC correction, the SOC correction effect is poor, the SOC estimation accuracy is low, and troubles are caused for customers.
Disclosure of Invention
The application provides a battery system and a SOC value correction method thereof, which are used for solving the problem of poor correction effect of the conventional SOC and improving the estimation accuracy of the SOC.
The embodiment of the application provides a method for correcting an SOC value of a battery system, which is applied to the battery system and comprises the following steps:
acquiring a current voltage value of the battery and a preset theoretical voltage deviation value under the current condition;
compensating the current voltage value according to the theoretical voltage deviation value to obtain a compensated compensation voltage value;
determining an operating state of the battery, the operating state comprising a charging state or a discharging state;
and correcting the SOC value according to the type of the working state of the battery and the compensation voltage value.
In one embodiment, the correcting the SOC value according to the type of the operating state of the battery and the compensation voltage value includes:
obtaining a theoretical SOC value according to the compensation voltage value and a preset SOC-OCV table;
calculating the difference value between the current residual capacity value and the theoretical SOC value;
and correcting the SOC value according to the type of the working state of the battery and the difference value.
In an embodiment, the correcting the SOC value according to the type of the battery operating state and the difference value includes:
acquiring a current value, wherein the current value is a charging current value in a charging state or a discharging current value in a discharging state;
compensating the current value according to the difference value to obtain a compensated target current value;
and substituting the target current value into an ampere-hour integration method algorithm to obtain a compensated and corrected SOC value.
In an embodiment, the compensating the current value according to the difference value to obtain a target current value includes:
obtaining a compensation current value according to the difference value and the current residual working time;
if the type of the current working state is a charging state, subtracting the compensation current value from the current value to obtain the target current value;
and if the type of the current working state is the discharging state, adding the current value to the compensation current value to obtain the target current value.
In an embodiment, if the type of the current operating state is a charging state, subtracting the compensation current value from the current value to obtain the target current value includes:
if the difference value C cal Greater than 0, calculating a compensation current value I for compensation cal ＝C cal ×t chg Calculating
Wherein the residual electric quantity calculated by the ampere-hour integration method is C remain The last recorded residual capacity is C remainback The actual charging time is t chg ；
If the difference value C cal Less than 0, calculating a compensation current value I for compensation cal ＝C cal ×t chg Calculating
Wherein the residual capacity calculated by the ampere-hour integration method is C remain The last recorded residual capacity is C remainback The charging remaining actual time is t chg ；
In an embodiment, the obtaining the target current value by adding the current value to the compensation current value if the current operating state is a set point state includes:
if the difference value C cal Greater than 0, calculating a compensation current value I for compensation cal ＝C cal ×t dsg Calculating
Wherein the residual capacity calculated by the ampere-hour integration method is C remain The last recorded residual capacity is C remainback The actual residual discharge time is t dsg ；
If the difference C cal Less than 0, calculating a compensation current value I for compensation cal ＝C cal ×t chg Calculating
Wherein the residual capacity calculated by the ampere-hour integration method is C remain The last recorded residual capacity is C remainback The discharge residual actual time is t dsg ；
In an embodiment, before the obtaining the current voltage value of the battery and the preset theoretical voltage deviation value under the current condition, the method further includes:
under a first preset condition, charging or discharging the battery by a preset SOC value, and recording a first voltage value sampled currently and a corresponding second voltage value obtained by the current SOC value through an SOC-OCV table;
obtaining a theoretical voltage deviation value under the current preset condition according to the first voltage value and the second voltage value;
and continuing to charge or discharge a preset SOC value, and repeating the steps to obtain a plurality of voltage theoretical deviation values.
In an embodiment, the first preset condition at least includes a preset temperature and/or a preset standing time.
In an embodiment, before the obtaining the current voltage value of the battery and the preset theoretical voltage deviation value under the current condition, the method further includes:
when the battery enters a working state, judging whether the state of the battery meets a second preset condition or not;
if so, executing the step of acquiring the current voltage value of the battery and the preset theoretical voltage deviation value under the current condition;
wherein the second preset condition at least comprises:
the standing time of the battery reaches a first preset value; or alternatively
The continuous working time of the battery reaches a second preset value; or
The interval duration between the current time point and the last time point for correcting the SOC value reaches a third preset value; or
The battery enters another operating state.
An embodiment of the present application further provides a battery system, where the battery system includes:
a plurality of battery cells;
and the battery cores are electrically connected and are used for executing the SOC value correction method of the battery system.
As can be seen from the above, in the embodiment of the present application, the current voltage value is compensated by obtaining the preset theoretical voltage deviation value under the current condition, and the SOC value is corrected according to the working state of the battery and the compensation voltage value when the battery enters the working state, so that the chance of correcting the battery in the working process can be increased, the correction effect of the SOC value can be improved, and the estimation accuracy of the SOC can be further improved.
Drawings
Fig. 1 is a flowchart illustrating an implementation of a battery system and a method for correcting an SOC value thereof according to an embodiment of the present disclosure.
Fig. 2 is a flowchart illustrating implementation of correcting an SOC value according to an embodiment of the present disclosure.
Fig. 3 is a flowchart of an implementation of obtaining a target current value according to an embodiment of the present application.
Fig. 4 is a flowchart illustrating an implementation of obtaining a theoretical voltage deviation value according to an embodiment of the present disclosure.
Fig. 5 is a schematic structural diagram of a battery system according to an embodiment of the present application.
Detailed Description
The following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying drawings, will make the advantages and features of the present application more readily appreciated by those skilled in the art, and thus will more clearly define the scope of the invention.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1, a structure of a battery system and a SOC value correction method thereof according to an embodiment of the present disclosure is shown.
As shown in fig. 1, the battery system and the SOC value correction method thereof are applied to a battery system, and the battery system may include a plurality of battery cells and an electric quantity management module. The electric quantity management module may correct and manage the SOC value of the battery cell based on the SOC value correction method.
The SOC value correction method of the battery system comprises the following steps:
101. and acquiring the current voltage value of the battery and a preset voltage theoretical deviation value under the current condition.
The current voltage value can be obtained through a voltage acquisition circuit of the battery cell. The theoretical voltage deviation value can be obtained by associating the current theoretical SOC value with the theoretical voltage deviation value before correction. The theoretical voltage deviation value is a deviation value between a voltage value obtained in a test in a certain SOC value and a theoretical voltage value obtained through an SOC-OCV table under a preset condition, and the theoretical voltage deviation value may be associated with a corresponding SOC value to obtain a corresponding table.
For example, in a test preparation process before factory shipment, the battery may be charged to 5% of the theoretical SOC at a preset temperature, left to stand for 10 minutes, and the current voltage value V and the static voltage value vstic at the current SOC value may be obtained, and the voltage theoretical deviation value Vdiff = V-vstic may be calculated. Different SOC values and standing time, different voltage values V and static voltage values Vstic under the current SOC value can be obtained, and the data can be made into corresponding mapping tables, so that the theoretical deviation value of the voltage under a certain theoretical SOC value can be quickly obtained.
102. And compensating the current voltage value according to the theoretical voltage deviation value to obtain a compensated compensation voltage value.
The theoretical voltage deviation value can represent the corresponding voltage deviation degree between the actual voltage and the theoretical voltage under a certain theoretical SOC value, and the theoretical voltage deviation value can be added with the current voltage value, so that the error of the SOC estimation process is reduced.
103. When the battery enters the working state, the type of the working state of the battery is determined, and the type of the working state comprises a charging state and a discharging state.
After the battery is detected to enter the charging state or the discharging state, the SOC value can be compensated based on different compensation triggering conditions.
In an embodiment, before obtaining the current voltage value of the battery and the preset theoretical voltage deviation value under the current condition, the method further includes:
when the battery enters a working state, judging whether the state of the battery meets a second preset condition or not; if so, executing the SOC value correction action, namely starting to acquire the current voltage value of the battery and the preset theoretical voltage deviation value under the current condition.
The second preset condition may be that the battery standing time reaches the first preset value, or the battery continuous operation time reaches the second preset value, or the interval time between the current time point and the time point of last correction of the SOC value reaches the third preset value, or the battery enters another operation state.
The standing time period may be from the last time the battery stops operating until the battery enters the operating state again, for example, when the standing time exceeds 30 minutes, the SOC value is corrected.
The continuous operation time period of the battery can be a continuous operation time period of the battery under the same operation state, for example, when the continuous charging time of the battery exceeds 30 minutes, the SOC value is corrected.
The interval time may be calculated from the last corrected SOC value, for example, more than 30 minutes from the last corrected SOC value, and the SOC value may be corrected again.
It can be understood that the first preset value, the second preset value and the third preset value can be set according to the actual application requirement, and can be set to different time lengths to meet the accuracy requirement of different SOC estimation results. Of course, other conditions besides the above conditions may be used to trigger the correction of the SOC value, and the present application is not limited thereto.
The types of the working states comprise a charging state and a discharging state, and different influences may be generated when the SOC value is estimated under different working conditions. Moreover, the SOC value is corrected by using the time when the battery enters the working state, so that the correction chance of the SOC value can be increased, the correction process is smoother, and the accuracy of SOC value estimation is improved.
104. And correcting the SOC value according to the type of the working state of the battery and the compensation voltage value.
And obtaining the compensated SOC value through the compensated compensation voltage value by an SOC-OCV table so as to complete the compensation of the SOC value.
For example, if the battery is in a charging state and the compensation voltage value is higher than the theoretical voltage value, the theoretical SOC value obtained by the ampere-hour integration method after a period of charging is higher than the actual SOC value, and the error is amplified during charging, whereas if the compensation voltage value is lower than the theoretical voltage value, the theoretical SOC value obtained by the ampere-hour integration method after a period of charging is lower than the actual SOC value, and the error is also amplified during charging.
While during discharge of the battery the effect will be the opposite. If the battery is in a discharging state and the compensation voltage value is higher than the theoretical voltage value, the theoretical SOC value obtained by using an ampere-hour integration method after the battery is charged for a period of time is lower than the actual SOC value, otherwise, the theoretical SOC value is higher than the actual SOC value.
Judging whether the battery is in a charging state or a discharging state can be beneficial to correct correction of the SOC value by the system, thereby improving the estimation accuracy of the SOC value.
As can be seen from the above, in the embodiment of the present application, the current voltage value is compensated by obtaining the preset theoretical voltage deviation value under the current condition, and the SOC value is corrected according to the working state of the battery and the compensation voltage value when the battery enters the working state, so that the chance of correcting the battery in the working process can be increased, the correction effect of the SOC value can be improved, and the estimation accuracy of the SOC can be further improved.
Referring to fig. 2, a flowchart of implementing the SOC value correction provided by the present application is shown.
201. And obtaining a theoretical SOC value according to the compensation voltage value and a preset SOC-OCV table.
202. And calculating the difference value between the current residual capacity value and the theoretical SOC value.
Wherein, the current residual capacity value is calculated by the system through an ampere-hour integral method.
203. And correcting the SOC value according to the type and the difference value of the working state of the battery.
The difference value can determine the difference between the current residual capacity value calculated by the ampere-hour integration method and the theoretical SOC value obtained by compensating the voltage value, so that the deviation in the SOC calculation process by the ampere-hour integration method can be corrected by the difference value caused by the difference value, the SOC value is corrected, and the calculation accuracy of the subsequent SOC value is improved.
In an embodiment, the battery parameters used in the ampere-hour integration method can be compensated based on the compensated SOC value, so that the accuracy of the SOC value estimated by the ampere-hour integration method is improved. May include the steps of:
acquiring a current value, wherein the current value is a charging current value in a charging state or a discharging current value in a discharging state; compensating the current value according to the difference value to obtain a compensated target current value; and substituting the target current value into an ampere-hour integration algorithm to obtain the compensated and corrected SOC value.
The target current value can be used for a subsequent ampere-hour integration algorithm, so that the error of SOC value estimation caused by the error of the current value is eliminated in time, and a subsequent system can estimate the SOC value more accurately.
Referring to fig. 3, a flow of obtaining a target current value according to an embodiment of the present application is shown.
As shown in fig. 3, compensating the current value according to the difference to obtain the target current value includes:
301. and obtaining a compensation current value according to the difference value and the current residual working time length.
302. And if the type of the current working state is the charging state, subtracting the compensation current value from the current value to obtain a target current value.
303. And if the type of the current working state is the discharging state, adding the current value to the compensation current value to obtain a target current value.
For example, the battery pack enters a charging state, the charging current is collected as I, and the actual charging remaining time t is calculated chg The difference value between the current residual capacity value and the theoretical SOC value is C cal The difference value between the last calculated current residual capacity value and the theoretical SOC value is C calback The residual electric quantity calculated by the ampere-hour integral method is C remain The last recorded residual capacity is C remainback 。
If C cal If it is larger than 0, the SOC rise needs to be slowed down. Calculating a current value I for compensation cal ＝C cal ×t chg Current is taken as I cal Guarantee when full C cal Is 0. Will I cal Add to the ampere-hour integration algorithm. Ampere-hour integral calculation
This step is repeated until C cal Is 0.
If C cal If the SOC is less than 0, the SOC should be raised quickly. Calculating a current value I for compensation cal ＝C cal ×t chg Current is taken as I cal Guarantee when full C cal Is 0. Will I cal Add to the ampere-hour integration algorithm. Ampere-hour integral calculation
Repeating the steps to obtain C cal Is 0.
If the charging state is detected to enter the discharging state, acquiring the discharging current I, and calculating the actual charging and discharging residual t dsg And a step of correction.
When the battery pack enters a discharging state, collecting discharging current I, and calculating the actual charging and discharging residual t dsg The difference value between the current residual capacity value and the theoretical SOC value is C cal The difference value between the last calculated current residual capacity value and the theoretical SOC value is C calback The residual electric quantity calculated by the ampere-hour integral method is C remain The last recorded residual capacity is C remainback 。
If C cal If it is larger than 0, the SOC decrease should be accelerated. Calculating a current value I for compensation cal ＝C cal ×t dsg Current is taken as I cal Ensure C when the electric quantity is discharged cal Is 0. Will I cal Add to the ampere-hour integration algorithm. Ampere-hour integral calculation
This step is repeated until C cal Is 0.
If C cal Less than 0, the value of the decrease in SOC needs to be slowed down. Calculating a current value I for compensation cal ＝C cal ×t dsg Current is taken as I cal Ensure C when the electric quantity is discharged cal Is 0. Will I cal Add to the ampere-hour integration algorithm. Ampere-hour integral calculation
This step is repeated until C cal Is 0.
If the charging state from the discharging state is detected, acquiring the charging current I, and calculating the actual charging and discharging residual t dsg And a step of correction.
It can be understood that the above manner can be combined with actual needs to obtain the compensated target current value, so that the accuracy of the SOC value obtained by the system through the ampere-hour integration method is higher.
By the correction mode aiming at the SOC value, the smooth correction of the SOC value can be realized in the calculation process of an ampere-hour integration method adopted when the SOC value is estimated from the working state of the battery, so that the accuracy of SOC estimation is improved.
Referring to fig. 4, a flow for obtaining a theoretical bias of voltage according to an embodiment of the present disclosure is shown.
As shown in fig. 4, before acquiring the current voltage value of the battery and the preset theoretical voltage deviation value under the current condition, the method further includes:
under a first preset condition, charging or discharging the battery by a preset SOC value, and recording a first voltage value sampled currently and a corresponding second voltage value obtained by the current SOC value through an SOC-OCV table; obtaining a theoretical voltage deviation value under the current preset condition according to the first voltage value and the second voltage value; and continuously charging or discharging a preset SOC value, and repeating the steps to obtain a plurality of voltage theoretical deviation values.
The first preset condition may include at least a preset temperature and/or a preset standing time.
For example, in the environment of temperature points (temperature points of the original static SOC-OCV table) T1, T2, T3,. Tn, the charging theory SOC of the electric quantity from 0 is 5%, the static state is kept for 10min, the voltage value V is recorded, and the voltage value V is calculated diff _10＝V-V static ，V static Voltage value of current temperature SOC = 5%. Standing for 30min, recording voltage value V, and calculating V diff _120＝V-V static . Standing for 120min, recording voltage value V, and calculating V diff _10＝V-V static . Charging to theoretical SOC of 10%, standing for 10min, recording voltage value V, and calculating V diff _10＝V-V static ，V static Voltage value of current temperature SOC = 5%. Standing for 30min, recording voltage value V, and calculating V diff _30＝V-V static . Standing for 120min, recording voltage value V, and calculating V diff _120＝V-V static . By analogy, recording every 5% to obtain a monomer voltage difference table of the monomer voltage and the charged static OCV at each standing time point at different temperatures. Similarly, the discharge is performed from the SOC of 100%, and a monomer voltage difference table of the discharge static OCV and the monomer voltage at each standing time point at different temperatures is obtained. By utilizing the difference table, the voltage theoretical deviation value under different temperatures and standing time can be quickly obtained, the accuracy of the voltage theoretical deviation value is improved, and the subsequent correction of the SOC value is more accurate and reliable.
Referring to fig. 5, a structure of an electronic system according to an embodiment of the disclosure is shown.
As shown in fig. 5, the battery system 10 includes a plurality of battery cells 11 and a power management module 12. The electric quantity management module 12 may correct and manage the SOC value of the battery cell 11 based on the SOC value correction method.
The power management module 12 may include a memory and a processor electrically connected to the memory, and the processor may obtain the voltage value and the current value of the battery cell 11 through a voltage acquisition circuit and a current acquisition circuit. The memory may store the battery system 10 and the SOC value correction method thereof as described in fig. 1 to 4.
Specifically, the power management module 12 is configured to execute the following steps:
acquiring a current voltage value of the battery and a preset theoretical voltage deviation value under the current condition; compensating the current voltage value according to the theoretical voltage deviation value to obtain a compensated compensation voltage value; determining an operating state of the battery, the operating state comprising a charging state or a discharging state; and correcting the SOC value according to the type of the working state of the battery and the compensation voltage value.
In one embodiment, the correcting the SOC value according to the type of the operating state of the battery and the compensation voltage value includes:
obtaining a theoretical SOC value according to the compensation voltage value and a preset SOC-OCV table;
calculating the difference value between the current residual capacity value and the theoretical SOC value;
and correcting the SOC value according to the type of the battery working state and the difference value.
In an embodiment, the correcting the SOC value according to the type of the battery operating state and the difference value includes:
acquiring a current value, wherein the current value is a charging current value in a charging state or a discharging current value in a discharging state;
compensating the current value according to the difference value to obtain a compensated target current value;
and substituting the target current value into an ampere-hour integration algorithm to obtain the compensated and corrected SOC value.
In an embodiment, the compensating the current value according to the difference value to obtain a target current value includes:
obtaining a compensation current value according to the difference value and the current residual working time;
if the type of the current working state is a charging state, subtracting the compensation current value from the current value to obtain the target current value;
and if the type of the current working state is the discharging state, adding the current value to the compensation current value to obtain the target current value.
In an embodiment, before the obtaining the current voltage value of the battery and the preset theoretical voltage deviation value under the current condition, the method further includes:
under a first preset condition, charging or discharging the battery by a preset SOC value, and recording a first voltage value sampled currently and a corresponding second voltage value obtained by the current SOC value through an SOC-OCV table;
obtaining a theoretical voltage deviation value under the current preset condition according to the first voltage value and the second voltage value;
and continuing to charge or discharge a preset SOC value, and repeating the steps to obtain a plurality of voltage theoretical deviation values.
In an embodiment, the first preset condition at least includes a preset temperature and/or a preset standing time.
In an embodiment, before the obtaining the current voltage value of the battery and the preset theoretical voltage deviation value under the current condition, the method further includes:
when the battery enters a working state, judging whether the state of the battery meets a second preset condition or not;
if yes, executing the step of acquiring the current voltage value of the battery and the preset theoretical voltage deviation value under the current condition;
wherein the preset conditions at least include:
the standing time of the battery reaches a first preset value; or alternatively
The continuous working time of the battery reaches a second preset value; or
The interval duration between the current time point and the time point of last SOC value correction reaches a third preset value; or
The battery enters another operating state.
The specific implementation manner of the battery system 10 and the SOC value correction method thereof executed by the power management module 12 may refer to the embodiment of the battery system 10 and the SOC value correction method thereof described in fig. 1 to 4, which is not limited in this application.
As can be seen from the above, in the embodiment of the present application, the current voltage value is compensated by obtaining the preset theoretical voltage deviation value under the current condition, and the SOC value is corrected according to the working state of the battery and the compensation voltage value when the battery enters the working state, so that the chance of correcting the battery in the working process can be increased, the correction effect of the SOC value can be improved, and the estimation accuracy of the SOC can be further improved.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments described above, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.
Claims (7)
1. A method for correcting an SOC value of a battery system is applied to the battery system, and is characterized by comprising the following steps:
acquiring a current voltage value of the battery and a preset theoretical voltage deviation value under the current condition;
compensating the current voltage value according to the theoretical voltage deviation value to obtain a compensated compensation voltage value;
when the battery enters a working state, determining the type of the working state of the battery, wherein the type of the working state comprises a charging state and a discharging state;
correcting the SOC value according to the type of the working state of the battery and the compensation voltage value;
correcting the SOC value according to the type of the working state of the battery and the compensation voltage value, wherein the correction comprises the following steps:
obtaining a theoretical SOC value according to the compensation voltage value and a preset SOC-OCV table;
calculating the difference value between the current residual capacity value and the theoretical SOC value;
correcting the SOC value according to the type of the battery working state and the difference value;
the correcting the SOC value according to the type of the battery working state and the difference value comprises the following steps:
acquiring a current value, wherein the current value is a charging current value in a charging state or a discharging current value in a discharging state;
compensating the current value according to the difference value to obtain a compensated target current value;
substituting the target current value into an ampere-hour integration algorithm to obtain a compensated and corrected SOC value;
the compensating the current value according to the difference value to obtain a target current value includes:
obtaining a compensation current value according to the difference value and the current residual working time;
if the type of the current working state is a charging state, subtracting the compensation current value from the current value to obtain the target current value;
and if the type of the current working state is the discharging state, adding the current value to the compensation current value to obtain the target current value.
2. The SOC value correction method of a battery system according to claim 1, wherein the obtaining the target current value by subtracting the compensation current value from the current value if the type of the current operating state is a state of charge comprises:
if the difference C cal Greater than 0, calculating a compensation current value I for compensation cal ＝C cal ×t chg Calculating
Wherein the residual electric quantity calculated by the ampere-hour integration method is C remain The last recorded residual capacity is C remainback The charging remaining actual time is t chg ；
If the difference C cal Less than 0, calculating a compensation current value I for compensation cal ＝C cal ×t chg Calculating
Wherein the residual capacity calculated by the ampere-hour integration method is C remain The last recorded residual capacity is C remainback The actual charging time is t chg 。
3. The SOC value correction method of a battery system according to claim 1, wherein the adding the compensation current value to the current value to obtain the target current value if the current operating state is a set point state includes:
if the difference C cal Greater than 0, calculating a compensation current value I for compensation cal ＝C cal ×t dsg Calculating
Wherein the residual capacity calculated by the ampere-hour integration method is C remain The last recorded residual capacity is C remainback The discharge residual actual time period is t dsg ；
If the difference C cal Less than 0, calculating a compensation current value I for compensation cal ＝C cal ×t chg Calculating
Wherein the residual electric quantity calculated by the ampere-hour integration method is C remain The last recorded residual capacity is C remainback The discharge residual actual time period is t dsg 。
4. The method for correcting SOC value of a battery system according to claim 1, further comprising, before said obtaining a current voltage value of the battery and a theoretical deviation value of voltage preset under current conditions:
under a first preset condition, charging or discharging the battery by a preset SOC value, and recording a first voltage value sampled currently and a corresponding second voltage value obtained by the current SOC value through an SOC-OCV table;
obtaining a theoretical voltage deviation value under the current preset condition according to the first voltage value and the second voltage value;
and continuing to charge or discharge a preset SOC value, and repeating the steps to obtain a plurality of voltage theoretical deviation values.
5. The SOC-value correcting method of a battery system according to claim 4, wherein the first preset condition includes at least a preset temperature and/or a preset rest time.
6. The SOC value correction method for a battery system according to claim 1, wherein before the obtaining of the current voltage value of the battery and the preset theoretical deviation value of the voltage under the current condition, the method further comprises:
when the battery enters a working state, judging whether the state of the battery meets a second preset condition or not;
if so, executing the step of acquiring the current voltage value of the battery and the preset theoretical voltage deviation value under the current condition;
wherein the second preset condition at least comprises:
the standing time of the battery reaches a first preset value; or
The continuous working time of the battery reaches a second preset value; or
The interval duration between the current time point and the last time point for correcting the SOC value reaches a third preset value; or
The battery enters another operating state.
7. A battery system, comprising:
a plurality of battery cells; and
the electric quantity management module is electrically connected with the battery cell and used for executing the SOC value correction method of the battery system according to any one of claims 1 to 6.
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