CN114563674B - Insulation detection device and method applied to energy storage system - Google Patents
Insulation detection device and method applied to energy storage system Download PDFInfo
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- CN114563674B CN114563674B CN202210448724.7A CN202210448724A CN114563674B CN 114563674 B CN114563674 B CN 114563674B CN 202210448724 A CN202210448724 A CN 202210448724A CN 114563674 B CN114563674 B CN 114563674B
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- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The invention relates to an insulation detection device and method applied to an energy storage system, wherein the device comprises an energy storage module, a Y capacitor processing circuit, a battery management module and a power module, a first capacitor branch and a second capacitor branch which are sequentially and electrically connected and have the same capacitance value are arranged between the positive input and the negative input of the power module, the battery management module is provided with a first resistor branch and a second resistor branch which are sequentially and electrically connected and have the same resistance value, the electric connection point between the first resistor branch and the second resistor branch is electrically connected with one end of the Y capacitor processing circuit, the other end of the Y capacitor processing circuit is electrically connected with a shell of the energy storage module, and the Y capacitor processing circuit is used for eliminating input current in the shell of the energy storage module during insulation detection. Through setting up Y electric capacity treatment circuit, can offset because the electric current that Y electric capacity charge-discharge caused casing department to produce among the power module realizes the accurate insulation detection to energy storage module.
Description
Technical Field
The invention relates to the technical field of insulation detection of energy storage modules, in particular to an insulation detection device and method applied to an energy storage system.
Background
Energy storage is rising as a new industry, the domestic energy storage technology is developed from small-scale application to large-scale application at present, the problems of battery leakage, wire harness aging, skin breaking, reduction of the skin breaking insulation of a temperature sensor NTC, reduction of the insulation of a structure body and the like exist in the application of an energy storage module, and the direct short circuit of a battery can be caused along with the continuous reduction of the resistance value, so that the fire disaster is caused, and therefore the insulation detection of the energy storage module is needed.
The battery insulation detection method comprises an unbalanced bridge and a pulse injection method, pulse injection can affect the stability of other products of the system, the existing insulation detection of more than 95% of stored energy adopts the unbalanced bridge principle, when an energy storage module is connected into a power supply (such as a PCS inverter) to be charged and discharged, a Y capacitor exists in the power supply module, the charging and discharging current of the Y capacitor can affect the sampling of an insulation resistor, the insulation detection solution of the existing energy storage module is that the system is connected into the power supply module, the single insulation acquisition period is lengthened, the end of the charging and discharging process of the capacitor is waited, the insulation value of the system is acquired again, the single insulation acquisition time is 5-10 min, along with the application of a 1500V energy storage system, the resistance value of an internal partial voltage resistor is increased, the insulation acquisition period can be slowed down, the precision becomes low, the insulation acquisition waiting time can cause the alarm delay of the system, and the safety is reduced.
Therefore, it is necessary to provide an insulation detecting apparatus that can eliminate the influence of the Y capacitance on the insulation detection and can accurately perform the insulation detection to solve the above-described technical problem.
Disclosure of Invention
In order to solve the technical problem, the invention provides an insulation detection device applied to an energy storage system. The technical problems that in the prior art, an unbalanced bridge principle is adopted to carry out insulation detection on an energy storage system, the collection period is long, and the detection precision is low are solved.
The technical effects of the invention are realized as follows:
the utility model provides an insulation detection device for energy storage system, includes energy storage module, Y electric capacity treatment circuit, battery management module and power module, energy storage module battery management module with power module connects gradually, be equipped with the same first electric capacity branch road of capacitance value and the second electric capacity branch road of electricity connection in proper order between the anodal input of power module and the negative pole input, first electric capacity branch road with electric connection point between the second electric capacity branch road with energy storage module's casing electricity is connected, first electric capacity branch road with second electric capacity branch road constitutes by at least one Y electric capacity unit, battery management module is equipped with the same first resistance branch road and the second resistance branch road of resistance value of electricity connection in proper order, first resistance branch road with second resistance branch road constitutes by at least one resistance unit, first resistance branch road with electric connection point between the second resistance branch road with Y electric capacity treatment circuit termination electricity links And the other end of the Y capacitance processing circuit is electrically connected with the machine shell of the energy storage module, and the Y capacitance processing circuit is used for eliminating the input current in the machine shell of the energy storage module when the energy storage module is subjected to insulation detection so as to accurately measure the insulation resistance value of the energy storage module. Through setting up Y electric capacity treatment circuit, can offset because Y electric capacity charge-discharge causes the electric current that casing department produced among the power module, realize the accurate insulating detection to energy storage module, solved among the prior art adopt the unbalanced bridge principle to carry out the collection cycle length that insulating detected to energy storage system, detect the technical problem that the precision is low.
Furthermore, the Y capacitor processing circuit includes a first switch and a first diode, an anode of the first diode is electrically connected to the case of the energy storage module through the first switch, and an electrical connection point between the first resistor branch and the second resistor branch is electrically connected to a cathode of the first diode. The first switch and the first diode are arranged in the Y capacitor processing circuit, so that the first diode is used for blocking the input current of the shell when the resistance of the shell is measured and is just opposite to the shell, and the problem that the Y capacitor is charged to form large current to cause insulation detection and the resistance of the shell is just opposite to the shell is solved.
Furthermore, the Y capacitance processing circuit further includes a second switch and a second diode, a cathode of the second diode is electrically connected to the case of the energy storage module through the second switch, and an electrical connection point between the first resistance branch and the second resistance branch is electrically connected to an anode of the second diode. The second switch and the second diode are arranged in the Y capacitor processing circuit, so that when the resistance value of the negative pair of the shell is measured, the current of the second diode flowing into the shell and the current of the Y capacitor discharging input shell are neutralized by closing the second switch, and the problem that the resistance value of the negative pair of the shell is slightly small due to insulation detection caused by the fact that the current of the Y capacitor discharging is input into the shell is solved.
Further, the first resistance branch further comprises a third switch, and the third switch is connected in series with the resistance unit in the first resistance branch.
Further, the second resistance branch further includes a fourth switch, and the fourth switch is connected in series with the resistance unit in the second resistance branch.
Furthermore, a first voltage detection point is arranged on the first resistor branch, and the first voltage detection point is electrically connected to a current input end of one of the resistor units in the first resistor branch.
Furthermore, a second voltage detection point is arranged on the second resistor branch, and the second voltage detection point is electrically connected to the current input end of one of the resistor units in the second resistor branch.
Further, the power supply device further comprises a total positive relay and a total negative relay, wherein the positive input of the power supply module is electrically connected with one end of the battery management module through the total positive relay, and the negative input of the power supply module is electrically connected with the other end of the battery management module through the total negative relay.
In addition, an insulation detection method applied to an energy storage system is also provided, and the method is implemented based on the insulation detection device applied to the energy storage system, and includes:
when a Y capacitor in the Y capacitor unit is charged, controlling a first switch to be closed and acquiring the voltage of a first voltage detection point at the current moment;
obtaining a corresponding resistance value of the energy storage module, which is opposite to the shell, according to the voltage of the first voltage detection point based on the first main path current;
when a Y capacitor in the Y capacitor unit is charged, controlling a second switch to be closed and acquiring the voltage of a second voltage detection point at the current moment;
and obtaining the negative pair of shell resistance values corresponding to the energy storage module according to the voltage of the second voltage detection point based on the second main path current so as to complete the insulation detection of the energy storage module.
Further, the controlling the first switch to close and acquiring the voltage of the first voltage detection point at the current moment includes:
controlling a third switch to be closed and acquiring the voltage of the first voltage detection point at the current moment;
obtaining a corresponding resistance value of the energy storage module, which is opposite to the shell, according to the voltage of the first voltage detection point based on the first main path current;
controlling the fourth switch to be switched off and acquiring the voltage of the second voltage detection point at the current moment;
obtaining a negative pair of shell resistance values corresponding to the energy storage module according to the voltage of the second voltage detection point based on the second main path current so as to complete insulation detection of the energy storage module;
when the preset time is reached, acquiring the voltage of a first voltage detection point at the current moment and the voltage of a second voltage detection point at the current moment, acquiring a right-facing case resistance value corresponding to the energy storage module according to the voltage of the first voltage detection point based on first total circuit current, and acquiring a right-facing case resistance value corresponding to the energy storage module according to the voltage of the first voltage detection point based on first total circuit current;
obtaining a first change value according to the corresponding positive casing resistance value when the third switch is closed and the corresponding positive casing resistance value when the preset time is reached, and obtaining a second change value according to the corresponding negative casing resistance value when the fourth switch is closed and the corresponding negative casing resistance value when the preset time is reached;
if the first change value and the second change value are both smaller than a preset value, closing of a first switch is not controlled, and the voltage of a first voltage detection point at the current moment is obtained;
otherwise, controlling the first switch to be closed and acquiring the voltage of the first voltage detection point at the current moment. Through before first switch and second switch are closed, directly accomplish just to the detection of casing resistance and burden to the casing resistance according to the time interval of setting for, can judge whether Y electric capacity is influential to insulating detection to can realize the accurate insulating detection to energy storage system under the work of adaptive control Y electric capacity treatment circuit or not work under the different situation.
As described above, the present invention has the following advantageous effects:
1) through setting up Y electric capacity treatment circuit, can offset because Y electric capacity charge-discharge causes the electric current that casing department produced among the power module, realize the accurate insulating detection to energy storage module, solved among the prior art adopt the unbalanced bridge principle to carry out the collection cycle length that insulating detected to energy storage system, detect the technical problem that the precision is low.
2) The first switch and the first diode are arranged in the Y capacitor processing circuit, so that the first diode is used for blocking the input current of the shell when the resistance of the shell is measured and is just opposite to the shell, and the problem that the Y capacitor is charged to form large current to cause insulation detection and the resistance of the shell is just opposite to the shell is solved.
3) The second switch and the second diode are arranged in the Y capacitor processing circuit, so that when the resistance value of the negative pair of the shell is measured, the current flowing into the shell of the second diode and the current discharged and input into the shell of the Y capacitor are neutralized by closing the second switch, and the problem that the resistance value of the negative pair of the shell is small due to insulation detection caused by the fact that the current discharged by the Y capacitor is input into the shell is solved.
4) Through before first switch and second switch are closed, directly accomplish just to the detection of casing resistance and burden to the casing resistance according to the time interval of setting for, can judge whether Y electric capacity is influential to insulating detection to can realize the accurate insulating detection to energy storage system under the work of adaptive control Y electric capacity treatment circuit or not work under the different situation.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the embodiment or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art it is also possible to derive other drawings from these drawings without inventive effort.
Fig. 1 is a schematic circuit diagram of an insulation detection device applied to an energy storage system according to an embodiment of the present disclosure;
fig. 2 is a flowchart of an insulation detection method applied to an energy storage system according to an embodiment of the present disclosure.
Wherein the reference numerals in the figures correspond to:
the device comprises an energy storage module 1, a Y capacitor processing circuit 2, a first switch 21, a first diode 22, a second switch 23, a second diode 24, a battery management module 3, a resistor 31, a power supply module 4 and a Y capacitor 41.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1:
as shown in fig. 1, an embodiment of the present disclosure provides an insulation detection apparatus applied to an energy storage system, where the insulation detection apparatus is configured to detect an insulation resistance of a case of the energy storage system to ensure stability of the energy storage system, the insulation detection apparatus includes an energy storage module 1, a Y capacitor processing circuit 2, a battery management module 3, and a power module 4, the energy storage module 1, the battery management module 3, and the power module 4 are sequentially connected, a first capacitor branch and a second capacitor branch which are sequentially electrically connected and have the same capacitance value are disposed between a positive input and a negative input of the power module 4, an electrical connection point between the first capacitor branch and the second capacitor branch is electrically connected to the case of the energy storage module 1, each of the first capacitor branch and the second capacitor branch is formed by at least one Y capacitor unit, the battery management module 3 is provided with a first resistor branch and a second resistor branch which are sequentially electrically connected and have the same resistance value, the first resistance branch circuit and the second resistance branch circuit are both composed of at least one resistance unit, an electric connection point between the first resistance branch circuit and the second resistance branch circuit is electrically connected with one end of the Y capacitance processing circuit 2, the other end of the Y capacitance processing circuit 2 is electrically connected with a machine shell of the energy storage module 1, and the Y capacitance processing circuit 2 is used for eliminating input current in the machine shell of the energy storage module 1 when the energy storage module 1 is subjected to insulation detection so as to accurately measure the insulation resistance value of the energy storage module 1.
Specifically, the Y capacitor unit may be a single Y capacitor, or may be formed by connecting more than one Y capacitors in series, in parallel, or in series-parallel, where the Y capacitors may be the same or different. In this embodiment, the first capacitor branch and the second capacitor branch both include a Y capacitor unit, and the Y capacitor unit is a Y capacitor 41. That is, in fig. 1, C1 and C2 are both Y capacitors 41, the first capacitor branch is C1, and the second capacitor branch is C2.
Specifically, the resistance unit may be one resistance, or may be formed by connecting more than one resistances in series, in parallel, or in series-parallel, and the resistances may be the same or different. In this embodiment, the first resistance branch and the second resistance branch each include two resistance units, and the resistance units are formed by one resistor 31 for explanation. Namely, R1, R2, R3 and R4 are all resistors 31, the first resistor branch is formed by connecting R1 and R2 in series, and the second resistor branch is formed by connecting R3 and R4 in series.
Preferably, the Y capacitance processing circuit 2 includes a first switch 21 and a first diode 22, an anode of the first diode 22 is electrically connected to the housing of the energy storage module 1 through the first switch 21, and an electrical connection point between the first resistance branch and the second resistance branch is electrically connected to a cathode of the first diode 22. By arranging the first switch 21 and the first diode 22 in the Y capacitor processing circuit 2, when the resistance value of the chassis facing the chassis is measured, the first switch 21 is closed to block the input current of the chassis by the first diode 22, so that the problem that the resistance value of the chassis facing the chassis is detected to be small due to the fact that the Y capacitor 41 is charged to form a large current is solved.
Preferably, the Y capacitance processing circuit 2 further includes a second switch 23 and a second diode 24, a cathode of the second diode 24 is electrically connected to the case of the energy storage module 1 through the second switch 23, and an electrical connection point between the first resistance branch and the second resistance branch is electrically connected to an anode of the second diode 24. By arranging the second switch 23 and the second diode 24 in the Y capacitance processing circuit 2, when the negative to chassis resistance value of the chassis is measured, the second switch 23 is closed to realize the neutralization of the current flowing into the chassis by the second diode 24 and the current discharged and input into the chassis by the Y capacitor 41, so that the problem that the current discharged by the Y capacitor 41 is input into the chassis to cause the insulation detection of the negative to chassis resistance value is small is solved.
It should be noted that, in the insulation detection mode of the energy storage system at present, it is common to adopt the unbalanced bridge principle to test, when the energy storage module is connected to a power supply (such as a PCS inverter) to charge and discharge, a Y capacitor exists in the power supply module, the charging and discharging current of the Y capacitor can influence the sampling of an insulation resistor, the single insulation acquisition period is lengthened, the end of the capacitor charging and discharging process is waited, the insulation value of the system is acquired again, the single insulation acquisition time is 5-10 min, along with the application of the energy storage 1500V system, the resistance value of an internal partial voltage resistor is increased, the insulation acquisition period can be slowed down, the precision becomes low, the insulation acquisition waiting time can cause the alarm delay of the system, and the safety is reduced.
Therefore, through setting up Y electric capacity treatment circuit 2, can offset because the electric current that the casing department produced is caused in the charge-discharge of Y electric capacity 41 among the power module 4, realize the accurate insulation detection to energy storage module 1, solved and adopted the unbalanced bridge principle to carry out the collection cycle length of insulation detection to energy storage system among the prior art, detect the technical problem that the precision is low.
Preferably, the first resistance branch further includes a third switch Q1, and the third switch Q1 is connected in series with the resistance unit in the first resistance branch.
Preferably, the first resistor branch is provided with a first voltage detecting point U2, and the first voltage detecting point U2 is electrically connected to a current input terminal of one of the resistor units in the first resistor branch.
Specifically, as shown in fig. 1, the total current I1 is measured in real time in the circuit, the first voltage detection point U2 is located at the R2 close to the positive end of the energy storage module 1, when the third switch Q1 is closed, the voltage value of the first voltage detection point U2 is obtained, and then the current I2 of the branch where the R2 is located can be obtained through calculation according to the resistance value of R2, so that the voltage at the two ends of the first resistance branch formed by connecting the R1 and the R2 in series, that is, the voltage U1 facing the two ends of the case resistance Rx is obtained, so that the resistance value facing the case resistance Rx is calculated to be U1/(I1-I2), that is, the case resistance Rx facing the case resistance can be calculated, and the facing insulation characteristic of the energy storage module 1 is determined.
Preferably, the second resistance branch further comprises a fourth switch Q2, the fourth switch Q2 being connected in series with the resistance unit in the second resistance branch.
Preferably, the second voltage detecting point U3 is disposed on the second resistor branch, and the second voltage detecting point U3 is electrically connected to the current input terminal of one of the resistor units in the second resistor branch.
Specifically, as shown in fig. 1, the total current I3 is measured in real time in the circuit, the second voltage detection point U3 is located at the R3 near the negative end of the energy storage module 1, when the fourth switch Q2 is closed, the voltage value of the second voltage detection point U3 is obtained, and then the current I4 of the branch where the R3 is located can be obtained through calculation according to the resistance value of R3, so as to obtain the voltage at the two ends of the second resistance branch formed by connecting R3 and R4 in series, that is, the voltage U2 at the two ends of the negative pair case resistance Rx, and then the voltage U2 at the two ends of the negative pair case resistance Rx is obtained according to the total resistance value of R3 and R4, so that the resistance value of the positive pair case resistance Rx is calculated as U2/(I3-I4), that the negative pair case resistance Rx can be calculated, and the negative pair insulation characteristic of the energy storage module 1 can be determined.
Preferably, the power supply further comprises a total positive relay and a total negative relay, wherein the positive input of the power supply module 4 is electrically connected with one end of the battery management module 3 through the total positive relay, and the negative input of the power supply module 4 is electrically connected with the other end of the battery management module 3 through the total negative relay.
In the prior art, the Y capacitance processing circuit 2 is not provided, that is, the electrical connection point between the first resistance branch and the second resistance branch is directly and electrically connected to the case of the energy storage module 1, so as to perform insulation detection on the case of the energy storage module 1. The differences between the present application and the prior art are explained as follows:
prior art insulation testing of enclosures involves measuring the positive and negative enclosure resistance values,
the resistance value of the opposite case is tested:
the Q1 and Q2 switches are disconnected, the total positive relay is closed, the energy storage module 1 is in charging of C1 and C2, C1 and C2 are in a charging state, and because C1 and C2 are Y capacitors, the Y capacitors have the characteristic of alternating current and blocking direct current, current in a circuit continuously decreases, the Q1 is closed at the moment, large current can be formed at the moment of closing Q1, current flows into the shell PE, and therefore calculated resistance of the right shell is small, and insulation detection is inaccurate.
After the Q1 is closed and the Q2 switch is opened, after a period of time, when the total negative charging is completed, the current of the casing PE gradually decreases to zero, and at this time, the current of the casing PE has no influence on the insulation detection, so that the Y capacitance processing circuit 2 does not need to be controlled to work.
And (3) testing the resistance of the negative pair of the shells:
the switch Q1 and Q2 are disconnected, the total positive relay is closed, the energy storage module 1 is in charging C1 and C2, C1 and C2 are in a charging state, C1 and C2 are Y capacitors, and the Y capacitors have the characteristic of blocking direct current through communication, so that the current in the circuit continuously drops, at the moment of closing the Q2, the Q2 is closed, a large current can be formed, and the current flows into the shell PE, so that the calculated negative resistance value of the shell is smaller, and the insulation detection is inaccurate.
When the total positive charging is completed, the current of the casing PE gradually decreases to zero when the total negative discharging is completed, and the current of the casing PE does not affect the insulation detection, so that the Y capacitance processing circuit 2 does not need to be controlled to work.
The application is just right the casing resistance test process:
q1 is closed, Q2 is opened, and the first switch 21 of the Y capacitance processing circuit 2 is controlled to be closed, so that the first diode 22 connected in series with the first switch 21 blocks the current of the chassis PE, thereby eliminating the influence of the current of the chassis PE on the insulation detection.
And (3) testing the resistance of the negative pair of the shells:
q1 is closed, Q2 is opened, and at the same time, the second switch 23 of the Y capacitance processing circuit 2 is controlled to be closed, so that the second diode 24 connected with the second switch 23 neutralizes the current of the chassis PE, thereby eliminating the influence of the current of the chassis PE on the insulation detection.
As shown in fig. 2, an embodiment of the present specification provides an insulation detection method applied to an energy storage system, where the method is implemented by an insulation detection apparatus applied to an energy storage system in embodiment 1, and includes:
s100, when a Y capacitor in the Y capacitor unit is charged, controlling a first switch 21 to be closed and acquiring the voltage of a first voltage detection point U2 at the current moment;
s200, obtaining a corresponding opposite case resistance value of the energy storage module 1 according to the voltage of the first voltage detection point U2 based on the first total current;
s300, when the Y capacitor in the Y capacitor unit discharges, controlling the second switch 23 to be closed and acquiring the voltage of a second voltage detection point U3 at the current moment;
and S400, obtaining the negative pair of shell resistance values corresponding to the energy storage module 1 according to the voltage of the second voltage detection point U3 based on the second main path current so as to complete insulation detection of the energy storage module 1.
In a specific embodiment, the step S100 of controlling the first switch 21 to close and acquiring the voltage of the first voltage detection point U2 at the current time includes:
controlling the third switch Q1 to close and acquiring the voltage of the first voltage detection point U2 at the current moment;
obtaining a corresponding opposite case resistance value of the energy storage module 1 according to the voltage of the first voltage detection point U2 based on the first main circuit current;
controlling the fourth switch Q2 to be closed and acquiring the voltage of the second voltage detection point U3 at the current moment;
obtaining a negative pair case resistance value corresponding to the energy storage module 1 according to the voltage of the second voltage detection point U3 based on a second main path current so as to complete insulation detection of the energy storage module 1;
when the preset time is reached, acquiring the voltage of a first voltage detection point U2 at the current moment and the voltage of a second voltage detection point U3 at the current moment, obtaining a right case resistance value corresponding to the energy storage module 1 according to the voltage of the first voltage detection point U2 based on first total path current, and obtaining a right case resistance value corresponding to the energy storage module 1 according to the voltage of the first voltage detection point U2 based on first total path current;
obtaining a first change value according to the positive case resistance value corresponding to the closing of the third switch Q1 and the positive case resistance value corresponding to the reaching of the preset time, and obtaining a second change value according to the negative case resistance value corresponding to the closing of the fourth switch Q2 and the negative case resistance value corresponding to the reaching of the preset time;
if the first variation value and the second variation value are both smaller than a preset value, the first switch 21 is not controlled to be closed, and the voltage of the first voltage detection point U2 at the current moment is acquired;
otherwise, controlling the first switch 21 to close and acquiring the voltage of the first voltage detection point U2 at the current moment is performed.
Wherein, the preset value is set by the personnel in the field according to the standard of insulation detection.
Specifically, when the positive or negative casing resistance value is detected, after a preset time interval, the positive or negative casing resistance value is detected again, if the corresponding resistance value changes too much, it is indicated that the Y capacitor has an influence on the insulation detection, and then the process of controlling the Y capacitor processing circuit is entered, that is, the corresponding first switch 21 or second switch 23 is closed;
if the change of the resistance value is detected to be constant, namely smaller than the preset value, the influence of the Y capacitor disappears temporarily, and the detection of the positive resistance value and the negative resistance value of the shell can be finished without controlling the Y capacitor processing circuit 2 to assist, namely, the circuit connection relationship at the moment is that the electric connection point between the first resistance branch and the second resistance branch is directly electrically connected with the shell of the energy storage module 1.
The detection process is continuous, that is, according to the preset time set by a person skilled in the art, detection is completed once every a preset time interval until the detected resistance value is no longer changed or is changed within the range of the preset value, and the detection result is an accurate result.
Before the first switch 21 and the second switch 23 are closed, the detection of the right resistance value of the casing and the negative resistance value of the casing is directly finished according to a set time interval, whether the Y capacitor influences the insulation detection can be judged, and therefore the Y capacitor processing circuit 2 can be adaptively controlled to work or not work under different conditions, and accurate insulation detection of the energy storage system is achieved.
Although the present invention has been described in connection with the preferred embodiments, it is not intended to be limited to the embodiments described herein, and various changes and modifications may be made without departing from the scope of the invention.
The embodiments and features of the embodiments described herein above can be combined with each other without conflict.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (8)
1. An insulation detection device applied to an energy storage system is characterized by comprising an energy storage module (1), a Y capacitance processing circuit (2), a battery management module (3) and a power module (4), wherein the energy storage module (1), the battery management module (3) and the power module (4) are sequentially connected, a first capacitance branch and a second capacitance branch which are sequentially and electrically connected and have the same capacitance value are arranged between the positive input and the negative input of the power module (4), the electrical connection point between the first capacitance branch and the second capacitance branch is electrically connected with a casing of the energy storage module (1), the first capacitance branch and the second capacitance branch are respectively composed of at least one Y capacitance unit, the battery management module (3) is provided with a first resistance branch and a second resistance branch which are sequentially and electrically connected and have the same resistance value, the first resistance branch circuit and the second resistance branch circuit are both composed of at least one resistance unit, an electric connection point between the first resistance branch circuit and the second resistance branch circuit is electrically connected with one end of the Y capacitance processing circuit (2), the other end of the Y capacitance processing circuit (2) is electrically connected with a machine shell of the energy storage module (1), the Y capacitance processing circuit (2) is used for eliminating input current in the machine shell of the energy storage module (1) when the energy storage module (1) is subjected to insulation detection so as to accurately measure the insulation resistance value of the energy storage module (1),
the Y capacitance processing circuit (2) comprises a first switch (21) and a first diode (22), the anode of the first diode (22) is electrically connected with the shell of the energy storage module (1) through the first switch (21), the electric connection point between the first resistance branch and the second resistance branch is electrically connected with the cathode of the first diode (22),
the Y capacitance processing circuit (2) further comprises a second switch (23) and a second diode (24), the cathode of the second diode (24) is electrically connected with the shell of the energy storage module (1) through the second switch (23), and the electrical connection point between the first resistance branch and the second resistance branch is electrically connected with the anode of the second diode (24).
2. The insulation detection device applied to the energy storage system according to claim 1, wherein the first resistive branch further comprises a third switch, and the third switch is connected in series with the resistive unit in the first resistive branch.
3. The insulation detection device applied to the energy storage system according to claim 2, wherein the second resistance branch further comprises a fourth switch, and the fourth switch is connected in series with the resistance unit in the second resistance branch.
4. The insulation detection device as recited in claim 3, wherein the first resistor branch has a first voltage detection point, and the first voltage detection point is electrically connected to a current input terminal of one of the resistor units in the first resistor branch.
5. The insulation detection device as claimed in claim 4, wherein a second voltage detection point is disposed on the second resistor branch, and the second voltage detection point is electrically connected to the current input terminal of one of the resistor units in the second resistor branch.
6. The insulation detection device applied to the energy storage system as recited in claim 1, further comprising a total positive relay and a total negative relay, wherein the positive input of the power supply module (4) is electrically connected with one end of the battery management module (3) through the total positive relay, and the negative input of the power supply module (4) is electrically connected with the other end of the battery management module (3) through the total negative relay.
7. An insulation detection method applied to an energy storage system, the method being implemented based on the insulation detection device applied to an energy storage system according to claim 6, and comprising:
when a Y capacitor in the Y capacitor unit is charged, controlling a first switch (21) to be closed and acquiring the voltage of a first voltage detection point at the current moment;
obtaining a corresponding resistance value of the energy storage module (1) opposite to the case according to the voltage of the first voltage detection point based on the first total path current;
when the Y capacitor in the Y capacitor unit discharges, controlling a second switch (23) to be closed and acquiring the voltage of a second voltage detection point at the current moment;
and obtaining the negative pair of shell resistance values corresponding to the energy storage module (1) according to the voltage of the second voltage detection point based on the second main path current so as to complete the insulation detection of the energy storage module (1).
8. The insulation detection method applied to the energy storage system as recited in claim 7, wherein the controlling the first switch (21) to be closed and acquiring the voltage of the first voltage detection point at the current time is preceded by:
controlling a third switch to be closed and acquiring the voltage of the first voltage detection point at the current moment;
obtaining a corresponding resistance value of the energy storage module (1) opposite to the case according to the voltage of the first voltage detection point based on the first total path current;
controlling the fourth switch to be switched off and acquiring the voltage of the second voltage detection point at the current moment;
obtaining a negative pair case resistance value corresponding to the energy storage module (1) according to the voltage of the second voltage detection point based on the second main path current so as to complete insulation detection of the energy storage module (1);
when the preset time is reached, acquiring the voltage of a first voltage detection point at the current moment and the voltage of a second voltage detection point at the current moment, acquiring a counter case resistance value corresponding to the energy storage module (1) according to the voltage of the first voltage detection point based on a first total path current, and acquiring a counter case resistance value corresponding to the energy storage module (1) according to the voltage of the first voltage detection point based on the first total path current;
obtaining a first change value according to the corresponding positive case resistance value when the third switch is closed and the corresponding positive case resistance value when the preset time is reached, and obtaining a second change value according to the corresponding negative case resistance value when the fourth switch is closed and the corresponding negative case resistance value when the preset time is reached;
if the first change value and the second change value are both smaller than a preset value, closing of a first switch (21) is not controlled, and the voltage of a first voltage detection point at the current moment is obtained;
otherwise, controlling the first switch (21) to be closed and acquiring the voltage of the first voltage detection point at the current moment.
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| CN117907845B (en) * | 2024-03-20 | 2024-05-17 | 山东泰开电力电子有限公司 | Electrochemical energy storage system insulation detection method based on electrical parameter analysis |
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