CN114047451A - Storage battery state identification method and device - Google Patents
Storage battery state identification method and device Download PDFInfo
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- 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
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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]
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Abstract
The application provides a storage battery state identification method and a storage battery state identification device, wherein the method comprises the following steps: acquiring the working voltage of a single battery in a storage battery pack, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery; acquiring the working current of the single battery acquired by the current sensor; setting a charging current threshold and a discharging current threshold according to the measuring range of the current sensor and the standard capacity of the single battery; and judging the working state of the storage battery according to the working voltage and the working current of the single battery and the relationship among the charging current threshold, the discharging current threshold, the highest open-circuit voltage of the storage battery and the lowest open-circuit voltage of the storage battery. The threshold value is set through parameters such as the maximum open-circuit voltage of the storage battery, the minimum open-circuit voltage of the storage battery, the battery capacity and the sensor error, so that the state of the storage battery is identified, and the accuracy of identifying the working state of the storage battery is improved.
Description
Technical Field
The present disclosure relates to battery technologies, and in particular, to a method and an apparatus for identifying a battery status.
Background
Lead-acid batteries have wide applications in the fields of communications and the like. In the use process of the lead-acid storage battery, the lead-acid storage battery needs to be monitored and managed, and the state of each storage battery needs to be identified. Lead-acid batteries generally have four states: floating charge state, uniform charge state, discharge state, and suspension state. The working principle of the storage battery in each state is different, and the switching power supply or the uninterruptible power supply which is connected with the storage battery is also in different working states.
For the state of the storage battery in the ordinary working process, the exact state of the storage battery cannot be obtained without the help of some data parameters and an effective judgment method, so that the current performance of the storage battery cannot be accurately known, the storage battery can be damaged due to over discharge, even the load can not be supplied with power to stop working, and serious consequences such as communication paralysis and the like can be caused. At present, the method for judging the charge-discharge state of the storage battery is generally to judge according to the charge-discharge current of the storage battery obtained by direct acquisition, wherein the charge-discharge current is greater than zero for charging, is equal to zero for floating charging, and is less than zero for discharging.
Therefore, the sensor error occurring when the working parameters of the storage battery are collected needs to be added into the judgment process of the working state identification of the storage battery, so as to reduce the misjudgment of the working state of the storage battery.
Disclosure of Invention
The application provides a storage battery state identification method and device, which are used for accurately identifying the working state of a storage battery.
In a first aspect, the present application provides a method for identifying a state of a storage battery, including:
acquiring the working voltage of a single battery in a storage battery pack, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery; acquiring the working current of the single battery acquired by the current sensor;
setting a charging current threshold and a discharging current threshold according to the measuring range of the current sensor and the standard capacity of the single battery, wherein the charging current threshold and the discharging current threshold have opposite signs; wherein, the discharge current threshold specifically includes: a first discharge current threshold value and a second discharge current threshold value, wherein the absolute value of the first discharge current threshold value is smaller than the absolute value of the second discharge current threshold value;
judging the working state of the storage battery according to the working voltage and the working current of the single battery and the relationship among the charging current threshold, the discharging current threshold, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery; wherein the operating state comprises: floating charge state, uniform charge state, discharge state, and suspension state.
Optionally, the determining the working state of the storage battery according to the working voltage and the working current of the single battery and the relationship between the charging current threshold, the discharging current threshold, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery specifically includes:
when the working current and the charging current threshold have the same sign, the absolute value of the working current is larger than the absolute value of the charging current threshold, and the working voltage is smaller than the minimum open-circuit voltage of the storage battery, the storage battery is judged to be in a uniform charging state;
when the working voltage is not less than the battery open circuit minimum voltage and not more than the battery open circuit maximum voltage, and when the working current is between the first discharge current threshold and the charge current threshold, determining that the battery is in a float charge state;
when the working current is between the second discharging current threshold and zero and the working voltage is smaller than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a suspended state;
and when the working current and the discharging current threshold have the same sign, the absolute value of the working current is greater than that of the second discharging current threshold, and the working voltage is less than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a discharging state.
Optionally, setting a charging current threshold and a discharging current threshold according to the range of the current sensor and the standard capacity of the single battery specifically includes:
setting the sign of a charging current threshold value, and calculating and obtaining the absolute value of the charging current threshold value, wherein the absolute value of the charging current threshold value is the sum of the range of the current sensor multiplied by a preset first coefficient and the standard capacity of the single battery multiplied by a preset second coefficient;
setting the sign of a first discharging current threshold value, and calculating and obtaining the absolute value of the first discharging current threshold value, wherein the sign of the first discharging current threshold value is opposite to that of the charging current threshold value, and the absolute value of the first discharging current threshold value is the measuring range of the current sensor multiplied by a predetermined third coefficient;
and setting the sign of a second discharging current threshold, and calculating and obtaining the absolute value of the second discharging current threshold, wherein the sign of the second discharging current threshold is opposite to that of the charging current threshold, and the absolute value of the second discharging current threshold is the sum of the measuring range of the current sensor multiplied by a predetermined fourth coefficient and the standard capacity of the single battery multiplied by a predetermined fifth coefficient.
Optionally, the storage battery comprises a plurality of single batteries; the method for acquiring the working voltage of the single battery in the storage battery pack comprises the following steps:
and acquiring the working voltage of the single battery through a voltage acquisition device arranged on the single battery.
Optionally, the anodes of the single batteries are connected to a charging and discharging cable for coupling with a power supply, and the current sensor is disposed on the charging and discharging cable.
In a second aspect, the present application provides a battery state recognition apparatus, comprising:
the parameter acquisition module is used for acquiring the working voltage of a single battery in the storage battery pack, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery; acquiring the working current of the single battery acquired by the current sensor;
the threshold setting module is used for setting a charging current threshold and a discharging current threshold according to the measuring range of the current sensor and the standard capacity of the single battery, wherein the signs of the charging current threshold and the discharging current threshold are opposite; wherein, the discharge current threshold specifically includes: a first discharge current threshold value and a second discharge current threshold value, wherein the absolute value of the first discharge current threshold value is smaller than the absolute value of the second discharge current threshold value;
the state identification module is used for judging the working state of the storage battery according to the working voltage and the working current of the single battery and the relationship among the charging current threshold, the discharging current threshold, the storage battery open-circuit highest voltage and the storage battery open-circuit lowest voltage; wherein the operating state comprises: floating charge state, uniform charge state, discharge state, and suspension state.
Optionally, the state identification module is specifically configured to:
when the working current and the charging current threshold have the same sign, the absolute value of the working current is larger than the absolute value of the charging current threshold, and the working voltage is smaller than the minimum open-circuit voltage of the storage battery, the storage battery is judged to be in a uniform charging state;
when the working voltage is not less than the battery open circuit minimum voltage and not more than the battery open circuit maximum voltage, and when the working current is between the first discharge current threshold and the charge current threshold, determining that the battery is in a float charge state;
when the working current is between the second discharging current threshold and zero and the working voltage is smaller than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a suspended state;
and when the working current and the discharging current threshold have the same sign, the absolute value of the working current is greater than that of the second discharging current threshold, and the working voltage is less than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a discharging state.
Optionally, the threshold setting module is specifically configured to:
setting the sign of a charging current threshold value, and calculating and obtaining the absolute value of the charging current threshold value, wherein the absolute value of the charging current threshold value is the sum of the range of the current sensor multiplied by a preset first coefficient and the standard capacity of the single battery multiplied by a preset second coefficient;
setting the sign of a first discharging current threshold value, and calculating and obtaining the absolute value of the first discharging current threshold value, wherein the sign of the first discharging current threshold value is opposite to that of the charging current threshold value, and the absolute value of the first discharging current threshold value is the measuring range of the current sensor multiplied by a predetermined third coefficient;
and setting the sign of a second discharging current threshold, and calculating and obtaining the absolute value of the second discharging current threshold, wherein the sign of the second discharging current threshold is opposite to that of the charging current threshold, and the absolute value of the second discharging current threshold is the sum of the measuring range of the current sensor multiplied by a predetermined fourth coefficient and the standard capacity of the single battery multiplied by a predetermined fifth coefficient.
Optionally, the storage battery comprises a plurality of single batteries; the parameter obtaining module specifically includes:
and the voltage acquisition device is arranged on the single battery and is used for acquiring and obtaining the working voltage of the single battery.
Optionally, the anodes of the single batteries are connected to a charging and discharging cable for coupling with a power supply, and the current sensor is disposed on the charging and discharging cable.
The application provides a storage battery state identification method and a storage battery state identification device, wherein the method comprises the following steps: acquiring the working voltage of a single battery in a storage battery pack, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery; acquiring the working current of the single battery acquired by the current sensor; setting a charging current threshold and a discharging current threshold according to the measuring range of the current sensor and the standard capacity of the single battery, wherein the charging current threshold and the discharging current threshold have opposite signs; wherein, the discharge current threshold specifically includes: a first discharge current threshold value and a second discharge current threshold value, wherein the absolute value of the first discharge current threshold value is smaller than the absolute value of the second discharge current threshold value; judging the working state of the storage battery according to the working voltage and the working current of the single battery and the relationship among the charging current threshold, the discharging current threshold, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery; wherein the operating state comprises: floating charge state, uniform charge state, discharge state, and suspension state. The threshold value is set through parameters such as the maximum open-circuit voltage of the storage battery, the minimum open-circuit voltage of the storage battery, the battery capacity and the sensor error, so that the state of the storage battery is identified, and the accuracy of identifying the working state of the storage battery is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic diagram of an application scenario provided by an example of the present application;
fig. 2 is a schematic flow chart of a method for identifying a state of a storage battery according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a battery state identification method according to a second embodiment of the present application;
fig. 4 is a schematic flow chart of a battery state identification method according to a third embodiment of the present application;
fig. 5 is a schematic diagram of a storage battery state identification map provided in the third embodiment of the present application;
fig. 6 is a schematic diagram of another battery state identification map provided in the third embodiment of the present application;
fig. 7 is a schematic diagram of another battery state identification map provided in the third embodiment of the present application;
fig. 8 is a schematic structural diagram of a battery state identification apparatus according to a fourth embodiment of the present application;
fig. 9 is a schematic structural diagram of an electronic device according to a fifth embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
Fig. 1 is a schematic view of an application scenario provided by an example of the present application, and as shown in fig. 1, fig. 1 is a view showing a collection scenario of a storage battery structure and an operating voltage and an operating current thereof, so as to illustrate an application scenario of storage battery state identification.
In the monitoring and management of lead-acid batteries, it is important to identify the state of each battery. Lead-acid batteries generally have four states: a discharge state, a suspension state, a floating charge state and a uniform charge state. The working principle of the storage battery in each state is different, and the switching power supply or the UPS which is connected with the storage battery is also in different working states. In the routine maintenance process of the storage battery, when the storage battery is intentionally discharged and charged, the state of the storage battery can be clearly known. However, for the state of the storage battery in the ordinary working process, the exact state of the storage battery cannot be obtained without the help of some data parameters and an effective judgment method, so that the current performance of the storage battery cannot be accurately known, the storage battery itself may be damaged due to over-discharge, and a more serious influence may be that the load cannot be supplied with power to stop working, for example, in the communication field, the direct result of the damage of the storage battery may be communication paralysis.
As shown in fig. 1, the present determination of the charge/discharge state of the storage battery is generally performed based on the directly acquired working voltage and working current of the storage battery, and mainly based on the detection of the charge/discharge current. Specifically, the charging current is taken as the positive direction, the charging is carried out when the current is larger than zero, the floating charging is carried out when the current is equal to zero, and the discharging is carried out when the current is smaller than zero. However, this method has a disadvantage in that the influence of the sensor error on the current detection is not taken into consideration, and thus the obtained current may have an inaccurate result due to the presence of the error, thereby causing erroneous judgment of the operating state of the battery. The most direct influence caused by the misjudgment is that a wrong maintenance basis is provided, the over-discharge of the storage battery is possibly caused, and the storage battery is damaged finally.
The technical means of the present application and the technical means of the present application will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. In the description of the present application, unless otherwise explicitly specified and defined, each term should be understood broadly in the art. Embodiments of the present application will be described below with reference to the accompanying drawings.
Example one
Fig. 2 is a schematic flow chart of a method for identifying a state of a storage battery according to an embodiment of the present application, and as shown in fig. 2, the method includes:
s101: acquiring the working voltage of a single battery in a storage battery pack, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery; acquiring the working current of the single battery acquired by the current sensor;
s102: setting a charging current threshold and a discharging current threshold according to the measuring range of the current sensor and the standard capacity of the single battery, wherein the charging current threshold and the discharging current threshold have opposite signs;
s103: and judging the working state of the storage battery according to the working voltage and the working current of the single battery and the relationship among the charging current threshold, the discharging current threshold, the highest open-circuit voltage of the storage battery and the lowest open-circuit voltage of the storage battery.
The present embodiment is exemplarily described with reference to specific application scenarios: firstly, acquiring the working voltage of a single battery in a storage battery pack, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery; acquiring the working current of the single battery acquired by the current sensor; the operating voltage and the operating current are used to identify the operating state of the battery, and the battery open-circuit maximum voltage and the battery open-circuit minimum voltage may be regarded as voltage thresholds for identifying the operating state of the battery, and used to compare the operating voltage with the two indexes.
Generally, the basic voltage unit of the single battery is 2V, in this case, the maximum open-circuit voltage of the storage battery is generally 2.3V, and the minimum open-circuit voltage of the storage battery is generally 2.2V. Accordingly, the voltage of the battery may be an integer multiple of 2V, e.g., 6V, 12V, etc. When the standard voltage of the battery is 6V, the maximum open-circuit voltage of the battery is generally 6.9V, and the minimum open-circuit voltage of the battery is generally 6.6V, and the maximum open-circuit voltage and the minimum open-circuit voltage of the battery, which are matched with the standard voltage of the battery, should be used in the operation state recognition.
Then, setting a charging current threshold and a discharging current threshold according to the measuring range of the current sensor and the standard capacity of the single battery, wherein the charging current threshold and the discharging current threshold have opposite signs; the charging direction is usually set to a positive direction, in which case the charging current threshold is a positive value and the discharging current threshold is a negative value. In practical applications, the setting of the positive direction may be reversed. According to the working voltage and working current of the single battery and the relationship among the charging current threshold, the discharging current threshold, the storage battery open-circuit maximum voltage and the storage battery open-circuit minimum voltage, the judgment rule can be set according to the mechanism of the battery in different working states, and then the working state of the storage battery is judged.
In one example, the battery includes a plurality of single cells; the method for acquiring the working voltage of the single battery in the storage battery pack comprises the following steps: and acquiring the working voltage of the single battery through a voltage acquisition device arranged on the single battery. The working voltage can be used for being compared with the open-circuit voltage of the storage battery, and the identification of the working state of the storage battery is completed by combining the characteristics of the current.
For example, the anodes of the single batteries are connected to a charging and discharging cable for coupling with a power supply, and the current sensor is arranged on the charging and discharging cable. The current sensor is used for detecting the working current of the storage battery so as to judge the working state of the storage battery. The current sensor may be a current transformer and the error is related to the range of the current sensor, and therefore, during the battery state identification process, the error may be set in conjunction with the range of the current sensor.
For both examples, reference may be made to the battery configuration, the detection mode and the connection mode shown in fig. 1.
The embodiment provides a storage battery state identification method, which comprises the following steps: acquiring the working voltage of a single battery in a storage battery pack, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery; acquiring the working current of the single battery acquired by the current sensor; setting a charging current threshold and a discharging current threshold according to the measuring range of the current sensor and the standard capacity of the single battery, wherein the charging current threshold and the discharging current threshold have opposite signs; wherein, the discharge current threshold specifically includes: a first discharge current threshold value and a second discharge current threshold value, wherein the absolute value of the first discharge current threshold value is smaller than the absolute value of the second discharge current threshold value; judging the working state of the storage battery according to the working voltage and the working current of the single battery and the relationship among the charging current threshold, the discharging current threshold, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery; wherein the operating state comprises: floating charge state, uniform charge state, discharge state, and suspension state. The threshold value is set through parameters such as the maximum open-circuit voltage of the storage battery, the minimum open-circuit voltage of the storage battery, the battery capacity and the sensor error, so that the state of the storage battery is identified, and the accuracy of identifying the working state of the storage battery is improved.
Example two
Fig. 3 is a schematic flow chart of a battery state identification method according to a second embodiment of the present application, and as shown in fig. 3, on the basis of any other embodiment, S102 specifically includes:
s201: setting the sign of a charging current threshold, and calculating to obtain the absolute value of the charging current threshold;
s202: setting the sign of a first discharge current threshold, and calculating to obtain the absolute value of the first discharge current threshold;
s203: and setting the sign of a second discharge current threshold, and calculating to obtain the absolute value of the second discharge current threshold.
The present embodiment is exemplarily described with reference to specific application scenarios: the present embodiment provides a method of current threshold setting for accomplishing the identification of the state of the battery. The method specifically comprises the following steps: setting the sign of a charging current threshold value, and calculating and obtaining the absolute value of the charging current threshold value, wherein the absolute value of the charging current threshold value is the sum of the range of the current sensor multiplied by a preset first coefficient and the standard capacity of the single battery multiplied by a preset second coefficient; setting the sign of a first discharging current threshold value, and calculating and obtaining the absolute value of the first discharging current threshold value, wherein the sign of the first discharging current threshold value is opposite to that of the charging current threshold value, and the absolute value of the first discharging current threshold value is the measuring range of the current sensor multiplied by a predetermined third coefficient; and setting the sign of a second discharging current threshold, and calculating and obtaining the absolute value of the second discharging current threshold, wherein the sign of the second discharging current threshold is opposite to that of the charging current threshold, and the absolute value of the second discharging current threshold is the sum of the measuring range of the current sensor multiplied by a predetermined fourth coefficient and the standard capacity of the single battery multiplied by a predetermined fifth coefficient.
For example, the charging current threshold, the first discharging current threshold, and the second discharging current threshold may specifically be: setting the charging current threshold to a positive value, and the absolute value of the charging current threshold is 1% of the current sensor range + 0.01% of the standard capacity of the battery; correspondingly, the first discharge current threshold and the second discharge current threshold should be negative values, and the absolute value of the first discharge current threshold may be 0.5% of the measuring range of the current sensor, which is mainly used to prevent the current direction from being detected by mistake due to the error of the current sensor, thereby causing the misjudgment of the state, and therefore, the absolute value of the first discharge current threshold should be obviously smaller than the absolute value of the second discharge current threshold; the absolute value of the second discharge current threshold may then be set to 1% current sensor range + 0.01% battery gauge capacity.
The present embodiment provides a method for identifying a state of a storage battery, which includes setting a sign of a charging current threshold, and calculating an absolute value of the charging current threshold, where the absolute value of the charging current threshold is a sum of a predetermined first coefficient multiplied by a range of a current sensor and a predetermined second coefficient multiplied by a standard capacity of a single battery; setting the sign of a first discharging current threshold value, and calculating and obtaining the absolute value of the first discharging current threshold value, wherein the sign of the first discharging current threshold value is opposite to that of the charging current threshold value, and the absolute value of the first discharging current threshold value is the measuring range of the current sensor multiplied by a predetermined third coefficient; and setting the sign of a second discharging current threshold, and calculating and obtaining the absolute value of the second discharging current threshold, wherein the sign of the second discharging current threshold is opposite to that of the charging current threshold, and the absolute value of the second discharging current threshold is the sum of the measuring range of the current sensor multiplied by a predetermined fourth coefficient and the standard capacity of the single battery multiplied by a predetermined fifth coefficient. The setting of the current threshold is completed through the measuring range of the current sensor and the battery capacity, and the accuracy of the state identification of the storage battery is improved.
EXAMPLE III
Fig. 4 is a schematic flow chart of a battery state identification method provided in the third embodiment of the present application, and as shown in fig. 4, on the basis of any other embodiment, S103 may specifically be:
s301: when the working current and the charging current threshold have the same sign, the absolute value of the working current is larger than the absolute value of the charging current threshold, and the working voltage is smaller than the minimum open-circuit voltage of the storage battery, the storage battery is judged to be in a uniform charging state;
s302: when the working voltage is not less than the battery open circuit minimum voltage and not more than the battery open circuit maximum voltage, and when the working current is between the first discharge current threshold and the charge current threshold, determining that the battery is in a float charge state;
s303: when the working current is between the second discharging current threshold and zero and the working voltage is smaller than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a suspended state;
s304: and when the working current and the discharging current threshold have the same sign, the absolute value of the working current is greater than that of the second discharging current threshold, and the working voltage is less than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a discharging state.
The present embodiment is exemplarily described with reference to specific application scenarios: after the threshold is set, the operating state of the battery needs to be identified based on the threshold and the detected maximum and minimum open-circuit voltages of the battery.
For an example, fig. 5 is a schematic diagram of a battery state identification map provided in the third embodiment of the present application to illustrate the identification rule, where U2 is a maximum voltage of an open circuit of the battery, U1 is a minimum voltage of the open circuit of the battery, I0 is a charging current threshold, I1 is a first discharging current threshold, and I2 is a second discharging current threshold. An operating state determination region shown in fig. 5 may be formed in the current-voltage diagram based on the battery open-circuit minimum voltage, the battery open-circuit maximum voltage, the charging current threshold, the first discharging current threshold, and the second discharging current threshold. Specifically, when the working current and the charging current threshold have the same sign, the absolute value of the working current is greater than the absolute value of the charging current threshold, and the working voltage is less than the minimum open-circuit voltage of the storage battery, it is determined that the storage battery is in an even charging state; when the working voltage is not less than the battery open circuit minimum voltage and not more than the battery open circuit maximum voltage, and when the working current is between the first discharge current threshold and the charge current threshold, determining that the battery is in a float charge state; when the working current is between the second discharging current threshold and zero and the working voltage is smaller than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a suspended state; and when the working current and the discharging current threshold have the same sign, the absolute value of the working current is greater than that of the second discharging current threshold, and the working voltage is less than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a discharging state.
An example, fig. 6 is a schematic diagram of another battery state identification map provided in the third embodiment of the present application, where each of the thresholds is a specific value scheme. Specifically, the charging current threshold is set to a positive value with an absolute value of 1% current sensor range + 0.01% battery gauge capacity; the first and second discharge current thresholds should be negative, the absolute value of the first discharge current threshold being 0.5% of the current sensor range, and the absolute value of the second discharge current threshold being 1% of the current sensor range + 0.01% of the standard battery capacity. Since the current is the more dominant factor in determining the state of charge equalization, all cases larger than the threshold charge current may be determined to be charge equalization as shown in the figure. Since the standard voltage of the single cell according to the present example is 2V, the minimum open-circuit voltage of the battery is 2.2V, and the maximum open-circuit voltage of the battery is 2.3V.
Fig. 7 is a schematic diagram of another battery state identification map provided in a third embodiment of the present application, in which a direction of a charging current is defined as a direction opposite to that in the previous embodiment, that is, the charging current and the charging current threshold are defined as negative values. The U2 is the highest open-circuit voltage of the storage battery, the U1 is the lowest open-circuit voltage of the storage battery, the I0 is the charging current threshold, the I1 is the first discharging current threshold, and the I2 is the second discharging current threshold.
The present embodiment provides a method for identifying a state of a storage battery, where when a sign of the working current is the same as that of the charging current threshold, an absolute value of the working current is greater than that of the charging current threshold, and the working voltage is less than the minimum open-circuit voltage of the storage battery, it is determined that the storage battery is in an even charging state; when the working voltage is not less than the battery open circuit minimum voltage and not more than the battery open circuit maximum voltage, and when the working current is between the first discharge current threshold and the charge current threshold, determining that the battery is in a float charge state; when the working current is between the second discharging current threshold and zero and the working voltage is smaller than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a suspended state; and when the working current and the discharging current threshold have the same sign, the absolute value of the working current is greater than that of the second discharging current threshold, and the working voltage is less than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a discharging state. The setting of the storage battery state identification rule is completed by detecting the working voltage and the working current and combining the setting of the current threshold under the condition of considering the error of the sensor, so that the accuracy of the storage battery state identification work is improved.
Example four
A fourth embodiment of the present application further provides a device for identifying a state of a storage battery to implement the foregoing method, and fig. 8 is a schematic structural diagram of the device for identifying a state of a storage battery provided in the fourth embodiment of the present application, as shown in fig. 8, on the basis of any other embodiment, the device includes:
the parameter obtaining module 41 is configured to obtain a working voltage of a single battery in the storage battery pack, a maximum open-circuit voltage of the storage battery, and a minimum open-circuit voltage of the storage battery; acquiring the working current of the single battery acquired by the current sensor;
a threshold setting module 42, configured to set a charging current threshold and a discharging current threshold according to a measurement range of the current sensor and a standard capacity of the single battery, where signs of the charging current threshold and the discharging current threshold are opposite; wherein, the discharge current threshold specifically includes: a first discharge current threshold value and a second discharge current threshold value, wherein the absolute value of the first discharge current threshold value is smaller than the absolute value of the second discharge current threshold value;
the state identification module 43 is configured to determine the working state of the storage battery according to the working voltage and the working current of the single battery, and the relationship between the charging current threshold, the discharging current threshold, the maximum open-circuit voltage of the storage battery, and the minimum open-circuit voltage of the storage battery; wherein the operating state comprises: floating charge state, uniform charge state, discharge state, and suspension state.
In one example, the battery includes a plurality of single cells; the parameter obtaining module 41 specifically includes: and acquiring the working voltage of the single battery through a voltage acquisition device arranged on the single battery. The working voltage can be used for being compared with the open-circuit voltage of the storage battery, and the identification of the working state of the storage battery is completed by combining the characteristics of the current.
For example, the anodes of the single batteries are connected to a charging and discharging cable for coupling with a power supply, and the current sensor is arranged on the charging and discharging cable. The current sensor is used for detecting the working current of the storage battery so as to judge the working state of the storage battery. The current sensor may be a current transformer and the error is related to the range of the current sensor, and therefore, during the battery state identification process, the error may be set in conjunction with the range of the current sensor.
In one example, the threshold setting module 42 is specifically configured to:
setting the sign of a charging current threshold value, and calculating and obtaining the absolute value of the charging current threshold value, wherein the absolute value of the charging current threshold value is the sum of the range of the current sensor multiplied by a preset first coefficient and the standard capacity of the single battery multiplied by a preset second coefficient;
setting the sign of a first discharging current threshold value, and calculating and obtaining the absolute value of the first discharging current threshold value, wherein the sign of the first discharging current threshold value is opposite to that of the charging current threshold value, and the absolute value of the first discharging current threshold value is the measuring range of the current sensor multiplied by a predetermined third coefficient;
and setting the sign of a second discharging current threshold, and calculating and obtaining the absolute value of the second discharging current threshold, wherein the sign of the second discharging current threshold is opposite to that of the charging current threshold, and the absolute value of the second discharging current threshold is the sum of the measuring range of the current sensor multiplied by a predetermined fourth coefficient and the standard capacity of the single battery multiplied by a predetermined fifth coefficient.
The setting of the current threshold is completed through the measuring range of the current sensor and the battery capacity, and the accuracy of the state identification of the storage battery is improved.
In one example, the state identification module 43 is specifically configured to:
when the working current and the charging current threshold have the same sign, the absolute value of the working current is larger than the absolute value of the charging current threshold, and the working voltage is smaller than the minimum open-circuit voltage of the storage battery, the storage battery is judged to be in a uniform charging state;
when the working voltage is not less than the battery open circuit minimum voltage and not more than the battery open circuit maximum voltage, and when the working current is between the first discharge current threshold and the charge current threshold, determining that the battery is in a float charge state;
when the working current is between the second discharging current threshold and zero and the working voltage is smaller than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a suspended state;
and when the working current and the discharging current threshold have the same sign, the absolute value of the working current is greater than that of the second discharging current threshold, and the working voltage is less than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a discharging state.
The setting of the storage battery state identification rule is completed by detecting the working voltage and the working current and combining the setting of the current threshold under the condition of considering the error of the sensor, so that the accuracy of the storage battery state identification work is improved.
The present embodiment provides a battery state recognition apparatus, including: the parameter acquisition module is used for acquiring the working voltage of a single battery in the storage battery pack, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery; acquiring the working current of the single battery acquired by the current sensor; the threshold setting module is used for setting a charging current threshold and a discharging current threshold according to the measuring range of the current sensor and the standard capacity of the single battery, wherein the signs of the charging current threshold and the discharging current threshold are opposite; wherein, the discharge current threshold specifically includes: a first discharge current threshold value and a second discharge current threshold value, wherein the absolute value of the first discharge current threshold value is smaller than the absolute value of the second discharge current threshold value; the state identification module is used for judging the working state of the storage battery according to the working voltage and the working current of the single battery and the relationship among the charging current threshold, the discharging current threshold, the storage battery open-circuit highest voltage and the storage battery open-circuit lowest voltage; wherein the operating state comprises: floating charge state, uniform charge state, discharge state, and suspension state. The threshold value is set through parameters such as the maximum open-circuit voltage of the storage battery, the minimum open-circuit voltage of the storage battery, the battery capacity and the sensor error, so that the state of the storage battery is identified, and the accuracy of identifying the working state of the storage battery is improved.
EXAMPLE five
Fig. 9 is a schematic structural diagram of an electronic device according to a fifth embodiment of the present application, and as shown in fig. 9, the electronic device includes:
a processor (processor)291, the electronic device further including a memory (memory) 292; a Communication Interface 293 and bus 294 may also be included. The processor 291, the memory 292, and the communication interface 293 may communicate with each other via the bus 294. Communication interface 293 may be used for the transmission of information. Processor 291 may call logic instructions in memory 294 to perform the methods of the embodiments described above.
Further, the logic instructions in the memory 292 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product.
The memory 292 is a computer-readable storage medium for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present application. The processor 291 executes the functional application and data processing by executing the software program, instructions and modules stored in the memory 292, so as to implement the method in the above method embodiments.
The memory 292 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the memory 292 may include a high speed random access memory and may also include a non-volatile memory.
The embodiment of the present application further provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, the computer-readable storage medium is configured to implement the method described in any embodiment.
The embodiment of the present application further provides a computer program product, which includes a computer program, and the computer program is executed by a processor to implement the method provided by the above embodiment.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A battery state recognition method, characterized by comprising:
acquiring the working voltage of a single battery in a storage battery pack, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery; acquiring the working current of the single battery acquired by the current sensor;
setting a charging current threshold and a discharging current threshold according to the measuring range of the current sensor and the standard capacity of the single battery, wherein the charging current threshold and the discharging current threshold have opposite signs; wherein, the discharge current threshold specifically includes: a first discharge current threshold value and a second discharge current threshold value, wherein the absolute value of the first discharge current threshold value is smaller than the absolute value of the second discharge current threshold value;
judging the working state of the storage battery according to the working voltage and the working current of the single battery and the relationship among the charging current threshold, the discharging current threshold, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery; wherein the operating state comprises: floating charge state, uniform charge state, discharge state, and suspension state.
2. The method according to claim 1, wherein the determining the operating state of the battery according to the operating voltage and the operating current of the single battery and the relationship between the charging current threshold, the discharging current threshold, the maximum open-circuit voltage of the battery and the minimum open-circuit voltage of the battery specifically comprises:
when the working current and the charging current threshold have the same sign, the absolute value of the working current is larger than the absolute value of the charging current threshold, and the working voltage is smaller than the minimum open-circuit voltage of the storage battery, the storage battery is judged to be in a uniform charging state;
when the working voltage is not less than the battery open circuit minimum voltage and not more than the battery open circuit maximum voltage, and when the working current is between the first discharge current threshold and the charge current threshold, determining that the battery is in a float charge state;
when the working current is between the second discharging current threshold and zero and the working voltage is smaller than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a suspended state;
and when the working current and the discharging current threshold have the same sign, the absolute value of the working current is greater than that of the second discharging current threshold, and the working voltage is less than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a discharging state.
3. The method according to claim 1, wherein setting the charging current threshold and the discharging current threshold according to the measuring range of the current sensor and the standard capacity of the single battery specifically comprises:
setting the sign of a charging current threshold value, and calculating and obtaining the absolute value of the charging current threshold value, wherein the absolute value of the charging current threshold value is the sum of the range of the current sensor multiplied by a preset first coefficient and the standard capacity of the single battery multiplied by a preset second coefficient;
setting the sign of a first discharging current threshold value, and calculating and obtaining the absolute value of the first discharging current threshold value, wherein the sign of the first discharging current threshold value is opposite to that of the charging current threshold value, and the absolute value of the first discharging current threshold value is the measuring range of the current sensor multiplied by a predetermined third coefficient;
and setting the sign of a second discharging current threshold, and calculating and obtaining the absolute value of the second discharging current threshold, wherein the sign of the second discharging current threshold is opposite to that of the charging current threshold, and the absolute value of the second discharging current threshold is the sum of the measuring range of the current sensor multiplied by a predetermined fourth coefficient and the standard capacity of the single battery multiplied by a predetermined fifth coefficient.
4. The method of any of claims 1-3, wherein the battery comprises a plurality of individual cells; the method for acquiring the working voltage of the single battery in the storage battery pack comprises the following steps:
and acquiring the working voltage of the single battery through a voltage acquisition device arranged on the single battery.
5. The method of claim 4, wherein the anodes of the plurality of single cells are each connected to a charging and discharging cable for coupling to a power source, the current sensor being disposed on the charging and discharging cable.
6. A battery state recognition device, characterized by comprising:
the parameter acquisition module is used for acquiring the working voltage of a single battery in the storage battery pack, the maximum open-circuit voltage of the storage battery and the minimum open-circuit voltage of the storage battery; acquiring the working current of the single battery acquired by the current sensor;
the threshold setting module is used for setting a charging current threshold and a discharging current threshold according to the measuring range of the current sensor and the standard capacity of the single battery, wherein the signs of the charging current threshold and the discharging current threshold are opposite; wherein, the discharge current threshold specifically includes: a first discharge current threshold value and a second discharge current threshold value, wherein the absolute value of the first discharge current threshold value is smaller than the absolute value of the second discharge current threshold value;
the state identification module is used for judging the working state of the storage battery according to the working voltage and the working current of the single battery and the relationship among the charging current threshold, the discharging current threshold, the storage battery open-circuit highest voltage and the storage battery open-circuit lowest voltage; wherein the operating state comprises: floating charge state, uniform charge state, discharge state, and suspension state.
7. The method of claim 6, wherein the state identification module is specifically configured to:
when the working current and the charging current threshold have the same sign, the absolute value of the working current is larger than the absolute value of the charging current threshold, and the working voltage is smaller than the minimum open-circuit voltage of the storage battery, the storage battery is judged to be in a uniform charging state;
when the working voltage is not less than the battery open circuit minimum voltage and not more than the battery open circuit maximum voltage, and when the working current is between the first discharge current threshold and the charge current threshold, determining that the battery is in a float charge state;
when the working current is between the second discharging current threshold and zero and the working voltage is smaller than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a suspended state;
and when the working current and the discharging current threshold have the same sign, the absolute value of the working current is greater than that of the second discharging current threshold, and the working voltage is less than the minimum open-circuit voltage of the storage battery, determining that the storage battery is in a discharging state.
8. The apparatus of claim 6, wherein the threshold setting module is specifically configured to:
setting the sign of a charging current threshold value, and calculating and obtaining the absolute value of the charging current threshold value, wherein the absolute value of the charging current threshold value is the sum of the range of the current sensor multiplied by a preset first coefficient and the standard capacity of the single battery multiplied by a preset second coefficient;
setting the sign of a first discharging current threshold value, and calculating and obtaining the absolute value of the first discharging current threshold value, wherein the sign of the first discharging current threshold value is opposite to that of the charging current threshold value, and the absolute value of the first discharging current threshold value is the measuring range of the current sensor multiplied by a predetermined third coefficient;
and setting the sign of a second discharging current threshold, and calculating and obtaining the absolute value of the second discharging current threshold, wherein the sign of the second discharging current threshold is opposite to that of the charging current threshold, and the absolute value of the second discharging current threshold is the sum of the measuring range of the current sensor multiplied by a predetermined fourth coefficient and the standard capacity of the single battery multiplied by a predetermined fifth coefficient.
9. The device according to any one of claims 6-8, wherein the battery comprises a plurality of individual cells; the parameter obtaining module specifically includes:
and the voltage acquisition device is arranged on the single battery and is used for acquiring and obtaining the working voltage of the single battery.
10. The apparatus of claim 9, wherein the anodes of the plurality of single batteries are each connected to a charging and discharging cable for coupling to a power source, and the current sensor is disposed on the charging and discharging cable.
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