CN104977535B - A kind of determination method and device of battery condition - Google Patents
A kind of determination method and device of battery condition Download PDFInfo
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Abstract
The invention discloses a kind of determination method of battery condition, the battery includes：Determine that the battery in voltage corresponding to the first moment and the second moment, determines each battery pack in battery in electric current corresponding to the first moment and the second moment respectively；When first moment meets any two kinds in three kinds of conditions, the starting point that first moment is the battery discharging event is determined；When second moment meets any two kinds in three kinds of conditions, the terminal that second moment is the battery discharging event is determined；Starting point using the terminal of the battery discharging event as the battery charge event；The floating charge value of the battery is determined, the terminal of the battery charge event is determined according to the floating charge value.The invention also discloses a kind of determining device of battery condition.
Description
Technical Field
The invention relates to a base station power supply technology, in particular to a method and a device for determining the state of a storage battery.
Background
At present, mobile communication base stations are widely distributed, and storage batteries in the base stations are important parts for emergency power supply; the storage battery is the power supply of base station when the outage, and the storage battery charges when supplying power, the emergent power supply of being convenient for, consequently, the battery in the base station is often in charge-discharge cycle process.
In the use process of the storage battery, if the charging and discharging processes of the storage battery cannot be effectively controlled, the storage battery can generate the phenomena of irreversible vulcanization, withering, swelling and the like, so that the capacity of the storage battery is reduced, the service life of the storage battery is shortened, and the storage battery is finally scrapped, thus the operation cost is increased, and the resource waste and the environmental pollution are caused. Therefore, in order to prevent the irreversible vulcanization, drying out, swelling and the like of the storage battery, it is necessary to calculate the ratio of the charge to the discharge of the storage battery and ensure that the charge capacity and the discharge capacity of the storage battery are consistent, so that the storage battery is in a state of being charged enough but not discharged enough.
Most of the existing common detection methods for the performance of the storage battery are physical methods or chemical methods, and all the methods need maintenance personnel to carry out detection, so that the existing detection methods have the problem of inaccurate detection results caused by manual operation differences, and the detection on the performance of the storage battery cannot be real-time and normalized. When data of storage battery charging and discharging events are extracted to determine a charging starting point and an end point and a discharging starting point and an end point of the storage battery, the data are not obtained through strict theoretical calculation, but are obtained through methods of using a measuring tool or collecting storage battery voltage and current by maintenance personnel according to previous data and self experience, so that the determined charging starting point and end point and discharging starting point and end point are inaccurate, errors exist in the charging electric quantity and the discharging electric quantity of the storage battery calculated according to the determined charging starting point and end point and the determined discharging starting point and end point, further, the judgment of the maintenance personnel on the performance of the storage battery is inaccurate, and finally the storage battery which can be safely used is replaced.
At present, the management of charging and discharging the storage battery is in a rough management state, and the charging and discharging conditions of the storage battery are not monitored and managed, so that the storage battery is frequently discharged more and less or discharged less and charged more, and the storage battery is frequently overdischarged and overcharged.
For companies with large storage battery number and large scale, management of the storage battery performance requires large manpower and financial resources, maintenance cost is high, management confusion is large, and in addition, background technology support means are lacked in the prior art, so that fine performance detection and maintenance management are difficult to realize for a large number of storage batteries.
Disclosure of Invention
In order to solve the existing technical problems, embodiments of the present invention provide a method and an apparatus for determining a state of a storage battery, which can accurately determine a start point and an end point of a storage battery charging event and a start point and an end point of a storage battery discharging event, and lay a foundation for improving the judgment of a maintainer on the performance of the storage battery.
The technical scheme of the invention is realized as follows: the embodiment of the invention provides a method for determining the state of a storage battery, wherein the storage battery comprises the following steps: at least two battery packs; the method comprises the following steps:
determining voltages of the storage battery at a first moment and a second moment respectively, determining currents of each battery pack in the storage battery at the first moment and the second moment, and determining a voltage of the storage battery at a moment previous to the first moment, a voltage at a moment next to the first moment, and a voltage at a moment next to the second moment;
determining the first moment as a starting point of the storage battery discharging event when the first moment meets any two of the following three conditions; wherein the three conditions are respectively as follows: the voltage V corresponding to the storage battery at the previous moment of the first momentt-1Voltage V corresponding to the first timetA voltage V corresponding to a next time of the first timet+1And a voltage V corresponding to a time next to the first timet+2The difference value between the medium voltages meets a voltage preset condition corresponding to the discharging event; the current corresponding to at least one battery pack in the storage battery at the first moment is smaller than a first current preset threshold corresponding to a discharging event; determining the first by a switching valueThe moment is the starting point of the storage battery discharging event;
when the second moment meets any two of the following three conditions, determining the second moment as the terminal point of the storage battery discharging event; wherein the three conditions are respectively as follows: the voltage V corresponding to the storage battery at the next moment of the second momentp+1And a voltage V corresponding to the second timePThe difference value of (1) meets a preset voltage threshold corresponding to the discharging event; the current corresponding to all the battery packs in the storage battery at the second time is greater than a second current preset threshold corresponding to a discharging event; determining the second time as the end point of the storage battery discharging event through the switching value;
taking the end point of the battery discharge event as the start point of the battery charge event;
and determining the floating value of the storage battery, and determining the end point of the storage battery charging event according to the floating value.
Further, the method further comprises:
determining the electric quantity value discharged by the storage battery according to the starting point of the storage battery discharging event and the end point of the discharging event;
determining the charged electric quantity value of the storage battery according to the starting point of the storage battery charging event and the end point of the charging event;
and determining the state of the storage battery according to the ratio of the charged electric quantity value of the storage battery to the discharged electric quantity value of the storage battery.
Further, the voltage V corresponding to the storage battery at the previous moment of the first momentt-1Voltage V corresponding to the first timetA voltage V corresponding to a next time of the first timet+1And a voltage V corresponding to a time next to the first timet+2The difference between the medium voltages meets the preset voltage condition corresponding to the discharging event, and the preset voltage condition comprises the following steps:
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttThe difference value is greater than or equal to a first preset threshold value; or,
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttIs more than or equal to a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt-1A voltage V corresponding to the next moment of the battery at the first momentt+1The difference value is greater than or equal to a first preset threshold value; or,
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttIs more than or equal to a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt-1A voltage V corresponding to the next moment of the battery at the first momentt+1Is greater than a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt+1A voltage V corresponding to the next time of the storage battery to the next time of the first timet+2Is greater than or equal to a first preset threshold value, and the voltage V corresponding to the storage battery at the next moment of the first momentt+1A voltage V corresponding to the accumulator at the first momenttIs smaller than a second preset threshold.
Further, the determining the floating value of the storage battery and the determining the end point of the storage battery charging event according to the floating value comprise:
when in a charging state, taking the current value of all battery packs of the storage battery at the same current value as the float charge of the storage battery;
determining a float threshold value according to the float value;
and taking the corresponding time when the current of all the battery packs in the storage battery is smaller than the float charging threshold value as the end point of the storage battery charging event.
An embodiment of the present invention further provides a device for determining a state of a storage battery, where the storage battery includes: at least two battery packs; the device comprises:
the collecting unit is used for respectively determining the voltages of the storage battery at a first moment and a second moment, determining the currents of each battery pack in the storage battery at the first moment and the second moment, and determining the voltage of the storage battery at the last moment of the first moment, the voltage at the next moment of the first moment and the voltage at the next moment of the second moment;
a first determination unit, configured to determine that the first time is a starting point of the battery discharging event when any two of the following three conditions are satisfied at the first time; wherein the three conditions are respectively as follows:
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1Voltage V corresponding to the first timetA voltage V corresponding to a next time of the first timet+1And a voltage V corresponding to a time next to the first timet+2The difference value between the medium voltages meets a voltage preset condition corresponding to the discharging event; the current corresponding to at least one battery pack in the storage battery at the first moment is smaller than a first current preset threshold corresponding to a discharging event; determining the first time as a starting point of the storage battery discharging event through a switching value;
a second determining unit, configured to determine that the second time is an end point of the battery discharging event when any two of the following three conditions are met at the second time; wherein the three conditions are respectively as follows:
the voltage V corresponding to the storage battery at the next moment of the second momentp+1And a voltage V corresponding to the second timePThe difference value of (1) meets a preset voltage threshold corresponding to the discharging event; the current corresponding to all the battery packs in the storage battery at the second time is greater than a second current preset threshold corresponding to a discharging event; determining the second time as the end point of the storage battery discharging event through the switching value;
a third determination unit for taking an end point of the battery discharge event as a starting point of the battery charging event;
and the fourth determining unit is used for determining the floating value of the storage battery and determining the end point of the storage battery charging event according to the floating value.
Further, the apparatus further comprises:
the first electric quantity calculating unit is used for determining the electric quantity value discharged by the storage battery according to the starting point of the discharge event of the storage battery and the end point of the discharge event;
the second electric quantity calculating unit is used for determining the electric quantity value charged by the storage battery according to the starting point of the storage battery charging event and the end point of the charging event;
and the state determining unit is used for determining the state of the storage battery according to the ratio of the charged electric quantity value of the storage battery to the discharged electric quantity value of the storage battery.
Further, the voltage V corresponding to the storage battery at the previous moment of the first momentt-1Voltage V corresponding to the first timetA voltage V corresponding to a next time of the first timet+1And a voltage V corresponding to a time next to the first timet+2The difference between the medium voltages meets the preset voltage condition corresponding to the discharging event, and the preset voltage condition comprises the following steps:
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttThe difference value is greater than or equal to a first preset threshold value; or,
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttIs more than or equal to a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt-1A voltage V corresponding to the next moment of the battery at the first momentt+1The difference value is greater than or equal to a first preset threshold value; or,
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttIs more than or equal to a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt-1A voltage V corresponding to the next moment of the battery at the first momentt+1Is greater than a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt+1A voltage V corresponding to the next time of the storage battery to the next time of the first timet+2Is greater than or equal to a first preset threshold value, and the voltage V corresponding to the storage battery at the next moment of the first momentt+1A voltage V corresponding to the accumulator at the first momenttIs smaller than a second preset threshold.
Further, the fourth determining unit further includes:
the float charge value determining subunit is used for taking the current value of all the battery packs of the storage battery at the same current value as the float charge value of the storage battery when the charging state is carried out;
the float threshold value determining subunit is used for determining a float threshold value according to the float value;
and the end point determining subunit is used for taking the corresponding time when the currents of all the battery packs in the storage battery are smaller than the float charging threshold value as the end point of the storage battery charging event.
The method and the device for determining the state of the storage battery can convert the existing manual physical operation into the automatic informatization analysis, namely, the data acquisition and analysis process of the storage battery is automated, so that the storage battery can be subjected to real-time, accurate and efficient performance detection, the service life of the storage battery is effectively prolonged, and the failure rate of the storage battery is reduced;
the embodiment of the invention adopts an information automatic analysis process, thereby technically shortening the performance detection flow of the storage battery, especially the large-scale storage battery pack. In addition, because the embodiment of the invention can accurately determine the starting point and the end point of the storage battery charging event and the starting point and the end point of the storage battery discharging event through a strict operation process, and further accurately calculate the ratio of the charged electric quantity value of the storage battery to the discharged electric quantity value of the storage battery, a foundation is laid for improving the judgment of maintainer on the performance of the storage battery, the service life of the storage battery is prolonged to the greatest extent, the resources are saved, and the cost is reduced.
In addition, by using the method and the device for determining the state of the storage battery, provided by the embodiment of the invention, an enterprise can establish a real-time and reliable technical platform, the management and maintenance process of the storage battery is optimized, the electronic operation and maintenance is realized, the performance of the storage battery can be predicted, measured, evaluated and verified, the management of the storage battery has integration and expandability, the management cost and the fault risk of the storage battery, particularly a large-scale storage battery pack, are effectively reduced, and thus a foundation is laid for improving the enterprise benefit and the brand value.
Drawings
FIG. 1 is a schematic diagram of a flow chart of a method for determining a state of a battery according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a battery state determining apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a fourth determining unit according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Example 1
FIG. 1 is a schematic flow chart of a method for determining the state of a battery according to an embodiment of the present invention; the battery includes: at least two battery packs; the method comprises the following steps:
step 101: determining voltages of the storage battery at a first moment and a second moment respectively, determining currents of each battery pack in the storage battery at the first moment and the second moment, and determining a voltage of the storage battery at a moment previous to the first moment, a voltage at a moment next to the first moment, and a voltage at a moment next to the second moment;
step 102: determining the first moment as a starting point of the storage battery discharging event when the first moment meets any two of the following three conditions; wherein the three conditions are respectively as follows:
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1Voltage V corresponding to the first timetA voltage V corresponding to a next time of the first timet+1And a pair of next time instants which are next to the first time instantCorresponding voltage Vt+2The difference value between the medium voltages meets a voltage preset condition corresponding to the discharging event; the current corresponding to at least one battery pack in the storage battery at the first moment is smaller than a first current preset threshold corresponding to a discharging event; determining the first time as a starting point of the storage battery discharging event through a switching value;
here, when the storage battery is subjected to a discharging event, the voltage of the storage battery is instantaneously reduced, and the reduction amplitude is related to the performance of the storage battery; generally, when a storage battery carries out a discharging event, the voltage is instantaneously reduced by about 3-4 volts, namely, the difference value between the voltage at the beginning of the discharging event of the storage battery and the voltage before the beginning of the discharging event is about 3-4 volts; the voltage of the storage battery rises back to a small extent after being reduced, and then slowly drops; when the storage battery is in a discharging event, the current of the storage battery is instantly reduced from a positive value to a negative value, and the current of the storage battery is a negative value in the whole discharging process of the storage battery. Thus, step 102 utilizes the characteristics of the battery discharge event to determine the start of the battery discharge event.
Further, the voltage V corresponding to the storage battery at the previous moment of the first momentt-1Voltage V corresponding to the first timetA voltage V corresponding to a next time of the first timet+1And a voltage V corresponding to a time next to the first timet+2The difference between the medium voltages meets the preset voltage condition corresponding to the discharging event, and the preset voltage condition comprises the following steps:
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttThe difference value is greater than or equal to a first preset threshold value; or,
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttIs more than or equal to a second preset threshold value and less than a first preset threshold value, and the voltage of the storage battery corresponding to the last moment of the first momentVt-1A voltage V corresponding to the next moment of the battery at the first momentt+1The difference value is greater than or equal to a first preset threshold value; or,
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttIs more than or equal to a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt-1A voltage V corresponding to the next moment of the battery at the first momentt+1Is greater than a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt+1A voltage V corresponding to the next time of the storage battery to the next time of the first timet+2Is greater than or equal to a first preset threshold value, and the voltage V corresponding to the storage battery at the next moment of the first momentt+1A voltage V corresponding to the accumulator at the first momenttIs smaller than a second preset threshold.
Here, the voltage preset condition and the first current preset threshold may be specifically set according to the performance of the battery itself, the working environment of the battery, and the like.
For example, the voltage V corresponding to the battery at the time immediately before the first timet-1Voltage V corresponding to the first timetA voltage V corresponding to a next time of the first timet+1And a voltage V corresponding to a time next to the first timet+2The difference between the medium voltages satisfies a preset voltage condition corresponding to the discharging event, wherein the difference between the voltages satisfies one of the following three conditions, and the three conditions specifically include: vt-1-Vt≥1.8；0.5≤Vt-1-Vt<1.8 and Vt-1-Vt+1≥1.8；0.5≤Vt-1-Vt<1.8 and 0.5<Vt-1-Vt+1<1.8 and Vt-1-Vt+2Not less than 1.8 andVt+1-Vt<0.5；
here, Vt-1Corresponding time and VtCorresponding time interval, V, of the first timet+1Corresponding time and VtCorresponding time interval of the first time, and Vt+1Corresponding time and Vt+2The corresponding time can be set according to the performance of the storage battery, the working environment of the storage battery and other factors.
The current corresponding to at least one battery pack in the storage battery at the first time is smaller than a first preset current threshold corresponding to a discharging event, which may specifically be:
at least one battery pack in the storage battery, the current I corresponding to the first momenttSatisfies the following conditions: i ist<-1。
Step 103: when the second moment meets any two of the following three conditions, determining the second moment as the terminal point of the storage battery discharging event; wherein the three conditions are respectively as follows:
the voltage V corresponding to the storage battery at the next moment of the second momentp+1And a voltage V corresponding to the second timePThe difference value of (1) meets a preset voltage threshold corresponding to the discharging event; the current corresponding to all the battery packs in the storage battery at the second time is greater than a second current preset threshold corresponding to a discharging event; determining the second time as the end point of the storage battery discharging event through the switching value;
here, the voltage preset threshold and the second current preset threshold may be specifically set according to the performance of the battery itself, the working environment of the battery, and the like.
For example, the voltage V corresponding to the battery at the next time of the second timep+1And a voltage V corresponding to the second timePThe difference value of (a) satisfies a preset voltage threshold corresponding to the discharging event, which may specifically be: vp+1-Vp≥0.5；
Wherein, the Vp+1The voltage corresponding to the storage battery at the next moment of the second moment is represented; the V isp+1Corresponding time and VpThe corresponding time interval of the second time can be set according to the performance of the storage battery, the working environment of the storage battery and other factors.
Specifically, the currents of all battery packs in the storage battery at the second time are greater than the preset second current threshold corresponding to the discharging event, which may specifically be:
any battery pack in the storage battery has corresponding current I at the second momentpAll satisfy: i isp>1。
Here, positive and negative values of the current indicate the direction of the current, for example, when the current is positive, it indicates that the battery is in a charged state; when the current is negative, the storage battery is in a discharge state.
Step 104: taking the end point of the battery discharge event as the start point of the battery charge event;
step 105: and determining the floating value of the storage battery, and determining the end point of the storage battery charging event according to the floating value.
Further, the determining the floating value of the storage battery and the determining the end point of the storage battery charging event according to the floating value comprise:
when in a charging state, taking the current value of all battery packs of the storage battery at the same current value as the float charge of the storage battery;
determining a float threshold value according to the float value;
and taking the corresponding time when the current of all the battery packs in the storage battery is smaller than the float charging threshold value as the end point of the storage battery charging event.
Specifically, when a charging event is carried out, the current value of all battery packs in the storage battery with the same current at n moments is used as the floating charge value of the storage battery; and determining a float threshold value of the storage battery according to the float charge value, for example, the float threshold value is a current value obtained after adding 2A to the float charge value,
and taking the corresponding moment when the currents of all the battery packs in the storage battery are smaller than the floating charge threshold value for the first time as the end point of the storage battery charging event.
Further, the method further comprises:
determining the electric quantity value discharged by the storage battery according to the starting point of the storage battery discharging event and the end point of the discharging event;
determining the charged electric quantity value of the storage battery according to the starting point of the storage battery charging event and the end point of the charging event;
and determining the state of the storage battery according to the ratio of the charged electric quantity value of the storage battery to the discharged electric quantity value of the storage battery.
Specifically, according to the starting point and the end point of the battery discharging event, the current corresponding to the battery discharging event is collected in the time period between the starting point and the end point of the battery discharging event, and the time interval between the current collection in the two times can be set arbitrarily, for example, the set time interval is any time period from 1 minute to 5 minutes, so that the electric quantity value C discharged by the battery is obtainedoutComprises the following steps:
wherein, the IiThe current value is acquired at the ith moment in a time period between the starting point of the discharging event of the storage battery and the end point of the discharging event; the T isiThe time interval between the ith moment and the (i-1) th moment; n is between the beginning of the discharge event and the end of the discharge event of the batteryCollecting n times of current in a time period; the calculated value of the discharged electric quantity C of the accumulator is obtained because the current is negative during the discharging event of the accumulatoroutIs negative.
Similarly, according to the starting point and the ending point of the charging event of the storage battery, the current corresponding to the charging event of the storage battery is collected in the time period between the starting point and the ending point of the charging event of the storage battery, and the time interval between the current collection of the previous time and the current collection of the next time can be set arbitrarily, for example, the set time interval is any time period of 1-5 minutes, so that the electric quantity value C charged by the storage battery is obtainedinComprises the following steps:
wherein, the IlThe current value is acquired at the first moment in the time period between the starting point of the storage battery charging event and the end point of the charging event; the T islThe time interval between the first moment and the (l-1) th moment; n is the total current collected for n times in the time period between the starting point of the storage battery charging event and the end point of the charging event; since the current is positive during the charging event of the battery, the calculated value of the charge C of the battery is calculatedinPositive values.
Here, the CoutIs negative and said CinPositive, since the state of the battery is determined by determining the ratio of the charge current to the discharge current of the battery regardless of the direction of the current, C is determinedoutAnd CinIs determined as the ratio ofoutAnd CinAbsolute value of the ratio of (a).
Correspondingly, the determining the state of the storage battery according to the ratio of the charged electric quantity value of the storage battery to the discharged electric quantity value of the storage battery specifically includes:
determining an absolute value Q of a ratio of a value of the electric quantity charged into the battery to a value of the electric quantity discharged from the battery to be:
further, setting a first threshold a and a second threshold b, wherein a < b; if the Q < a, determining that the storage battery is in a charging unsaturated state; if a is not less than Q and not more than b, determining that the storage battery is in a charging saturation state; if Q > b, the battery is in an overshoot state.
Therefore, according to the state of the storage battery, adjusting the starting point and the end point of the storage battery charging event and the starting point and the end point of the storage battery discharging event until the Q value determined according to the starting point and the end point of the storage battery charging event and the starting point and the end point of the storage battery discharging event meets a and Q and b;
in the actual process, the state of the storage battery is determined according to the determined and accurate starting point and the accurate end point of the storage battery charging event and the determined starting point and the accurate end point of the storage battery discharging event, so that a foundation can be laid for improving the judgment of the performance of the storage battery by maintainers, the service life of the storage battery can be prolonged to the greatest extent, resources are saved, and the cost is reduced.
An embodiment of the present invention further provides a device for determining a state of a storage battery corresponding to the method, as shown in fig. 2, where the device includes:
the acquisition unit 21 is configured to determine voltages corresponding to the storage batteries at a first time and a second time, determine currents corresponding to each battery pack in the storage batteries at the first time and the second time, and determine a voltage corresponding to the storage battery at a previous time of the first time, a voltage corresponding to a next time of the first time, and a voltage corresponding to the next time of the second time;
a first determining unit 22, configured to determine that the first time is a starting point of the battery discharging event when any two of the following three conditions are met at the first time; wherein the three conditions are respectively as follows:
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1Voltage V corresponding to the first timetA voltage V corresponding to a next time of the first timet+1And a voltage V corresponding to a time next to the first timet+2The difference value between the medium voltages meets a voltage preset condition corresponding to the discharging event; the current corresponding to at least one battery pack in the storage battery at the first moment is smaller than a first current preset threshold corresponding to a discharging event; determining the first time as a starting point of the storage battery discharging event through a switching value;
a second determining unit 23, configured to determine that the second time is an end point of the battery discharging event when any two of the following three conditions are met at the second time; wherein the three conditions are respectively as follows:
the voltage V corresponding to the storage battery at the next moment of the second momentp+1And a voltage V corresponding to the second timePThe difference value of (1) meets a preset voltage threshold corresponding to the discharging event; the current corresponding to all the battery packs in the storage battery at the second time is greater than a second current preset threshold corresponding to a discharging event; determining the second time as the end point of the storage battery discharging event through the switching value;
a third determination unit 24 for taking the end of the battery discharge event as the start of the battery charging event;
and the fourth determining unit 25 is used for determining the floating value of the storage battery and determining the end point of the storage battery charging event according to the floating value.
Further, the apparatus further comprises:
the first electric quantity calculating unit 26 is used for determining the electric quantity value discharged by the storage battery according to the starting point of the storage battery discharging event and the end point of the discharging event;
the second electric quantity calculating unit 27 is used for determining the electric quantity value charged by the storage battery according to the starting point of the storage battery charging event and the end point of the charging event;
a state determination unit 28 for determining the state of the battery based on the ratio of the amount of electric charge charged into the battery to the amount of electric charge discharged from the battery.
Further, the voltage V corresponding to the storage battery at the previous moment of the first momentt-1Voltage V corresponding to the first timetA voltage V corresponding to a next time of the first timet+1And a voltage V corresponding to a time next to the first timet+2The difference between the medium voltages meets the preset voltage condition corresponding to the discharging event, and the preset voltage condition comprises the following steps:
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttThe difference value is greater than or equal to a first preset threshold value; or,
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttIs more than or equal to a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt-1A voltage V corresponding to the next moment of the battery at the first momentt+1The difference value is greater than or equal to a first preset threshold value; or,
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1With the accumulator at the first momentCorresponding voltage VtIs more than or equal to a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt-1A voltage V corresponding to the next moment of the battery at the first momentt+1Is greater than a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt+1A voltage V corresponding to the next time of the storage battery to the next time of the first timet+2Is greater than or equal to a first preset threshold value, and the voltage V corresponding to the storage battery at the next moment of the first momentt+1A voltage V corresponding to the accumulator at the first momenttIs smaller than a second preset threshold.
Further, as shown in fig. 3, the fourth determination unit 25 further includes:
a float value determining subunit 251, configured to, in a charging state, use a current value when all battery packs of the storage battery are at the same current value as a float value of the storage battery;
a float threshold determination subunit 252, configured to determine a float threshold according to the float value;
and an end point determining subunit 253, configured to use, as the end point of the storage battery charging event, a time point corresponding to when the currents of all battery packs in the storage battery are smaller than a float threshold.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (8)
1. A method of determining a state of a battery, the battery comprising: at least two battery packs; the method comprises the following steps:
determining voltages of the storage battery at a first moment and a second moment respectively, determining currents of each battery pack in the storage battery at the first moment and the second moment, and determining a voltage of the storage battery at a moment previous to the first moment, a voltage at a moment next to the first moment, and a voltage at a moment next to the second moment;
determining the first moment as a starting point of the storage battery discharging event when the first moment meets any two of the following three conditions; wherein the three conditions are respectively as follows: the voltage V corresponding to the storage battery at the previous moment of the first momentt-1Voltage V corresponding to the first timetA voltage V corresponding to a next time of the first timet+1And a voltage V corresponding to a time next to the first timet+2The difference value between the medium voltages meets a voltage preset condition corresponding to the discharging event; the current corresponding to at least one battery pack in the storage battery at the first moment is smaller than a first current preset threshold corresponding to a discharging event; determining the first time as a starting point of the storage battery discharging event through a switching value;
when the second moment meets any two of the following three conditions, determining the second moment as the terminal point of the storage battery discharging event; wherein the three conditions are respectively as follows: the voltage V corresponding to the storage battery at the next moment of the second momentp+1And a voltage V corresponding to the second timePThe difference value of (1) meets a preset voltage threshold corresponding to the discharging event; the current corresponding to all the battery packs in the storage battery at the second time is greater than a second current preset threshold corresponding to a discharging event; determining the second time as the end point of the storage battery discharging event through the switching value;
taking the end point of the battery discharge event as the start point of the battery charge event;
and determining the floating value of the storage battery, and determining the end point of the storage battery charging event according to the floating value.
2. The method of claim 1, further comprising:
determining the electric quantity value discharged by the storage battery according to the starting point of the storage battery discharging event and the end point of the discharging event;
determining the charged electric quantity value of the storage battery according to the starting point of the storage battery charging event and the end point of the charging event;
and determining the state of the storage battery according to the ratio of the charged electric quantity value of the storage battery to the discharged electric quantity value of the storage battery.
3. Method according to claim 1 or 2, characterized in that the voltage V corresponding to the accumulator at the moment of time immediately preceding the first moment of timet-1Voltage V corresponding to the first timetA voltage V corresponding to a next time of the first timet+1And a voltage V corresponding to a time next to the first timet+2The difference between the medium voltages meets the preset voltage condition corresponding to the discharging event, and the preset voltage condition comprises the following steps:
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttThe difference value is greater than or equal to a first preset threshold value; or,
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttIs more than or equal to a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt-1A voltage V corresponding to the next moment of the battery at the first momentt+1The difference value is greater than or equal to a first preset threshold value; or,
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttIs more than or equal to a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt-1A voltage V corresponding to the next moment of the battery at the first momentt+1Is greater than a second preset threshold value and less than a first preset threshold value, and the storage battery corresponds to the last moment of the first momentVoltage Vt-1A voltage V corresponding to the next time of the storage battery to the next time of the first timet+2Is greater than or equal to a first preset threshold value, and the voltage V corresponding to the storage battery at the next moment of the first momentt+1A voltage V corresponding to the accumulator at the first momenttIs smaller than a second preset threshold.
4. The method of claim 1 or 2, wherein the determining a floating value for the battery from which to determine the end of the battery charging event comprises:
when in a charging state, taking the current value of all battery packs of the storage battery at the same current value as the float charge of the storage battery;
determining a float threshold value according to the float value;
and taking the corresponding time when the current of all the battery packs in the storage battery is smaller than the float charging threshold value as the end point of the storage battery charging event.
5. A device for determining the state of a battery, characterized in that the battery comprises: at least two battery packs; the device comprises:
the collecting unit is used for respectively determining the voltages of the storage battery at a first moment and a second moment, determining the currents of each battery pack in the storage battery at the first moment and the second moment, and determining the voltage of the storage battery at the last moment of the first moment, the voltage at the next moment of the first moment and the voltage at the next moment of the second moment;
a first determination unit, configured to determine that the first time is a starting point of the battery discharging event when any two of the following three conditions are satisfied at the first time; wherein the three conditions are respectively as follows:
the battery being at the first momentVoltage V corresponding to last momentt-1Voltage V corresponding to the first timetA voltage V corresponding to a next time of the first timet+1And a voltage V corresponding to a time next to the first timet+2The difference value between the medium voltages meets a voltage preset condition corresponding to the discharging event; the current corresponding to at least one battery pack in the storage battery at the first moment is smaller than a first current preset threshold corresponding to a discharging event; determining the first time as a starting point of the storage battery discharging event through a switching value;
a second determining unit, configured to determine that the second time is an end point of the battery discharging event when any two of the following three conditions are met at the second time; wherein the three conditions are respectively as follows:
the voltage V corresponding to the storage battery at the next moment of the second momentp+1And a voltage V corresponding to the second timePThe difference value of (1) meets a preset voltage threshold corresponding to the discharging event; the current corresponding to all the battery packs in the storage battery at the second time is greater than a second current preset threshold corresponding to a discharging event; determining the second time as the end point of the storage battery discharging event through the switching value;
a third determination unit for taking an end point of the battery discharge event as a starting point of the battery charging event;
and the fourth determining unit is used for determining the floating value of the storage battery and determining the end point of the storage battery charging event according to the floating value.
6. The apparatus of claim 5, further comprising:
the first electric quantity calculating unit is used for determining the electric quantity value discharged by the storage battery according to the starting point of the discharge event of the storage battery and the end point of the discharge event;
the second electric quantity calculating unit is used for determining the electric quantity value charged by the storage battery according to the starting point of the storage battery charging event and the end point of the charging event;
and the state determining unit is used for determining the state of the storage battery according to the ratio of the charged electric quantity value of the storage battery to the discharged electric quantity value of the storage battery.
7. Device according to claim 5 or 6, characterised in that the voltage V corresponding to the accumulator at the moment immediately preceding the first momentt-1Voltage V corresponding to the first timetA voltage V corresponding to a next time of the first timet+1And a voltage V corresponding to a time next to the first timet+2The difference between the medium voltages meets the preset voltage condition corresponding to the discharging event, and the preset voltage condition comprises the following steps:
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttThe difference value is greater than or equal to a first preset threshold value; or,
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttIs more than or equal to a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt-1A voltage V corresponding to the next moment of the battery at the first momentt+1The difference value is greater than or equal to a first preset threshold value; or,
the voltage V corresponding to the storage battery at the previous moment of the first momentt-1A voltage V corresponding to the accumulator at the first momenttIs more than or equal to a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt-1A voltage V corresponding to the next moment of the battery at the first momentt+1Is greater than a second preset threshold value and less than a first preset threshold value, and the voltage V corresponding to the storage battery at the last moment of the first momentt-1Corresponding to the next time of the storage battery at the next time of the first timeVoltage V oft+2Is greater than or equal to a first preset threshold value, and the voltage V corresponding to the storage battery at the next moment of the first momentt+1A voltage V corresponding to the accumulator at the first momenttIs smaller than a second preset threshold.
8. The apparatus according to claim 5 or 6, wherein the fourth determination unit further comprises:
the float charge value determining subunit is used for taking the current value of all the battery packs of the storage battery at the same current value as the float charge value of the storage battery when the charging state is carried out;
the float threshold value determining subunit is used for determining a float threshold value according to the float value;
and the end point determining subunit is used for taking the corresponding time when the currents of all the battery packs in the storage battery are smaller than the float charging threshold value as the end point of the storage battery charging event.
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