CN118518939B - Insulation resistance detection circuit, method and electronic device in battery cluster - Google Patents
Insulation resistance detection circuit, method and electronic device in battery cluster Download PDFInfo
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- CN118518939B CN118518939B CN202410972178.6A CN202410972178A CN118518939B CN 118518939 B CN118518939 B CN 118518939B CN 202410972178 A CN202410972178 A CN 202410972178A CN 118518939 B CN118518939 B CN 118518939B
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- 238000009413 insulation Methods 0.000 title claims abstract description 189
- 238000001514 detection method Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000002955 isolation Methods 0.000 claims abstract description 128
- 238000004590 computer program Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 9
- 238000010998 test method Methods 0.000 description 8
- 230000002159 abnormal effect Effects 0.000 description 6
- 230000006870 function Effects 0.000 description 6
- 239000000178 monomer Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
本发明公开了一种电池簇中绝缘电阻的检测电路、方法及电子设备。其中，该电路包括：分压电路，分压电路的第一端与待进行绝缘电阻检测的电池簇的电池簇正极连接，第二端与电池簇的电池簇负极连接；隔离电路，隔离电路的第一端与电池簇中的目标电池单体的正极连接，第二端与分压电路的第三端连接，第三端接地，其中，电池簇中包括多个电池单体，目标电池单体用于表示电池簇中待进行绝缘电阻检测的电池单体；控制器，控制器与分压电路和隔离电路连接，用于控制分压电路和隔离电路的通断状态，以确定目标电池单体的正极的绝缘电阻值。本发明解决了相关技术中对电池簇中绝缘电阻进行检测的效率较低的技术问题。
The present invention discloses a detection circuit, method and electronic device for insulation resistance in a battery cluster. The circuit includes: a voltage divider circuit, wherein the first end of the voltage divider circuit is connected to the positive electrode of the battery cluster to be tested for insulation resistance, and the second end is connected to the negative electrode of the battery cluster; an isolation circuit, wherein the first end of the isolation circuit is connected to the positive electrode of the target battery cell in the battery cluster, the second end is connected to the third end of the voltage divider circuit, and the third end is grounded, wherein the battery cluster includes multiple battery cells, and the target battery cell is used to represent the battery cell to be tested for insulation resistance in the battery cluster; a controller, wherein the controller is connected to the voltage divider circuit and the isolation circuit, and is used to control the on-off state of the voltage divider circuit and the isolation circuit to determine the insulation resistance value of the positive electrode of the target battery cell. The present invention solves the technical problem of low efficiency in detecting insulation resistance in a battery cluster in the related art.
Description
Technical Field
The invention relates to the field of battery cluster insulation detection, in particular to a circuit and a method for detecting insulation resistance in a battery cluster and electronic equipment.
Background
The battery clusters can be formed by a plurality of battery monomers, and the insulation resistance value of the total positive or total negative of the battery clusters to the ground is a key index for measuring the insulation safety and stability of the battery clusters, so that the insulation detection of the battery clusters is very important.
At present, in the related art, when the insulation resistance of the battery cluster is detected, the insulation resistance between the total positive or total negative ground or the equivalent parallel value of multiple nodes is mainly aimed at, and when the insulation resistance of the battery cells in the battery cluster is detected, the problems of misdetection or long detection time consumption exist, and the efficiency of detecting the insulation resistance in the battery cluster in the related art is low.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a circuit and a method for detecting insulation resistance in a battery cluster and electronic equipment, which at least solve the technical problem of low efficiency of detecting the insulation resistance in the battery cluster in the related technology.
According to one aspect of the embodiment of the invention, a detection circuit of insulation resistance in a battery cluster is provided, and the detection circuit comprises a voltage division circuit, an isolation circuit, a first end of the isolation circuit, a third end of the isolation circuit and a controller, wherein the first end of the voltage division circuit is connected with a battery cluster positive electrode of the battery cluster to be subjected to insulation resistance detection, the second end of the voltage division circuit is connected with a battery cluster negative electrode of the battery cluster, the second end of the isolation circuit is connected with a positive electrode of a target battery cell in the battery cluster, the third end of the isolation circuit is grounded, the battery cluster comprises a plurality of battery cells, the target battery cell is used for representing the battery cell to be subjected to insulation resistance detection in the battery cluster, and the controller is connected with the voltage division circuit and the isolation circuit and used for controlling the on-off states of the voltage division circuit and the isolation circuit so as to determine the insulation resistance value of the positive electrode of the target battery cell.
Optionally, the isolation circuit comprises an isolation resistor, a first switch and a controller, wherein the first end of the isolation resistor is connected with the first end of the isolation circuit, the second end of the isolation resistor is connected with the third end of the isolation circuit, the first end of the first switch is connected with the second end of the isolation circuit, the second end of the first switch is connected with the third end of the isolation circuit, and the controller is connected with the first switch and used for controlling the opening and closing states of the first switch to control the opening and closing states of the isolation circuit.
Optionally, the voltage dividing circuit comprises a first voltage dividing circuit, a second voltage dividing circuit and a controller, wherein the first end of the first voltage dividing circuit is connected with the first end of the voltage dividing circuit, the first end of the second voltage dividing circuit is connected with the second end of the voltage dividing circuit, the second end of the second voltage dividing circuit is connected with the second end of the first voltage dividing circuit, and the controller is connected with the first voltage dividing circuit and the second voltage dividing circuit and used for controlling the on-off states of the first voltage dividing circuit and the second voltage dividing circuit.
Optionally, the first voltage dividing circuit comprises a first resistor, a second switch, a second resistor and a controller, wherein the first end of the first resistor is connected with the first end of the first voltage dividing circuit, the first end of the second switch is connected with the second end of the first resistor, the first end of the second resistor is connected with the second end of the second switch, the second end of the second resistor is connected with the second end of the first voltage dividing circuit, and the controller is connected with the second switch and used for controlling the opening and closing states of the second switch to control the on-off states of the first voltage dividing circuit.
Optionally, the second voltage dividing circuit comprises a third resistor, a third switch, a fourth resistor and a controller, wherein the first end of the third resistor is connected with the first end of the second voltage dividing circuit, the first end of the third switch is connected with the second end of the third resistor, the first end of the fourth resistor is connected with the second end of the third switch, the second end of the fourth resistor is connected with the second end of the second voltage dividing circuit, and the controller is connected with the third switch and used for controlling the opening and closing states of the third switch to control the on-off states of the second voltage dividing circuit.
According to another aspect of the embodiment of the invention, the method for detecting the insulation resistance in the battery cluster comprises the steps of controlling the on-off states of the voltage dividing circuit and the isolation circuit through the controller, enabling the detection circuit of the insulation resistance to be in different voltage dividing states, and obtaining a plurality of voltages corresponding to the different voltage dividing states, wherein the voltage dividing states are used for representing the state that the detection circuit of the insulation resistance is in different communication states and is in voltage dividing when being connected with the battery cluster, and determining the insulation resistance value of the positive electrode of a target battery cell in the battery cluster based on the plurality of voltages.
Optionally, the plurality of voltages include a first voltage and a second voltage, and the on-off states of the voltage dividing circuit and the isolation circuit are controlled by the controller, so that the detection circuit of the insulation resistor is in different voltage dividing states, and a plurality of voltages corresponding to the different voltage dividing states are obtained, including: the method comprises the steps of controlling a first voltage dividing circuit and a second voltage dividing circuit in a voltage dividing circuit to be in a connection state, controlling an isolating circuit to be in a disconnection state, enabling a detection circuit of an insulation resistor to be in a first voltage dividing state, and acquiring a first voltage and a second voltage, wherein the first voltage dividing state is used for representing the state that the first voltage dividing circuit and the second voltage dividing circuit are in voltage dividing, the first voltage is used for representing the potential difference of a second resistor flowing in the first voltage dividing state, and the second voltage is used for representing the potential difference of a fourth resistor flowing in the first voltage dividing state.
Optionally, the plurality of voltages include a third voltage, and the controller is used for controlling the on-off states of the voltage dividing circuit and the isolation circuit, so that the detection circuit of the insulation resistor is in different voltage dividing states, and the plurality of voltages corresponding to the different voltage dividing states are obtained, including: the first voltage dividing circuit and the isolation circuit are controlled to be in a connection state, the second voltage dividing circuit is controlled to be in a disconnection state, so that the detection circuit of the insulation resistor is in a second voltage dividing state, and a third voltage is obtained, wherein the second voltage dividing state is used for indicating that the first voltage dividing circuit and the isolation circuit are in a voltage dividing state, and the third voltage is used for indicating a voltage value at the positive electrode of a battery cluster of the battery cluster in the second voltage dividing state.
Optionally, the plurality of voltages includes a fourth voltage, and the controller controls the on-off states of the voltage dividing circuit and the isolation circuit, so that the detection circuit of the insulation resistor is in different voltage dividing states, and obtains a plurality of voltages corresponding to the different voltage dividing states, including: the second voltage dividing circuit and the isolation circuit are controlled to be in a connection state, the first voltage dividing circuit is controlled to be in a disconnection state, so that the detection circuit of the insulation resistor is in a third voltage dividing state, and a fourth voltage is obtained, wherein the third voltage dividing state is used for indicating that the second voltage dividing circuit and the isolation circuit are in a voltage dividing state, and the fourth voltage is used for indicating a voltage value at the negative electrode of a battery cluster of the battery cluster in the third voltage dividing state.
Optionally, the plurality of voltages comprise a first voltage, a second voltage, a third voltage and a fourth voltage, the insulation resistance value of the positive electrode of the target battery cell in the battery cluster is determined based on the plurality of voltages, the insulation resistance value comprises the steps of determining the actual voltage of the battery cluster based on the first voltage, the second voltage, the first resistor, the second resistor, the third resistor and the fourth resistor, constructing a first voltage division relation in a second voltage division state based on the actual voltage, the third voltage, the first resistor and the second resistor, constructing a second voltage division relation in a third voltage division state based on the actual voltage, the fourth voltage, the third resistor and the fourth resistor, and determining the insulation resistance value based on the first voltage division relation and the second voltage division relation.
According to another aspect of the embodiment of the invention, the electronic equipment further provides the electronic equipment, which comprises a memory and a processor, wherein the memory stores an executable program, and the processor is used for running the program, and the method for detecting the insulation resistance in the battery cluster is executed when the program runs.
According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium including a stored executable program, wherein a device in which the executable program is controlled to operate executes the method for detecting insulation resistance in the battery cluster.
According to another aspect of the embodiments of the present invention, there is also provided a computer program product, which when executed by a processor, implements the method for detecting insulation resistance in a battery cluster described above.
The embodiment of the invention discloses a detection circuit of insulation resistance in a battery cluster, which comprises a voltage dividing circuit, an isolation circuit and a controller, wherein a first end of the voltage dividing circuit is connected with a battery cluster anode of the battery cluster to be subjected to insulation resistance detection, a second end of the voltage dividing circuit is connected with a battery cluster cathode of the battery cluster, a first end of the isolation circuit is connected with a positive electrode of a target battery monomer in the battery cluster, a second end of the isolation circuit is connected with a third end of the voltage dividing circuit, and a third end of the isolation circuit is grounded, the battery cluster comprises a plurality of battery monomers, the target battery monomer is used for representing the battery monomers to be subjected to insulation resistance detection in the battery cluster, and the controller is connected with the voltage dividing circuit and the isolation circuit and used for controlling the on-off states of the voltage dividing circuit and the isolation circuit so as to determine the insulation resistance value of the positive electrode of the target battery monomer. It is easy to notice that, the detection circuit of insulation resistance in the battery cluster is provided with the voltage dividing circuit at two ends of the battery cluster, the isolating circuit is arranged between the target battery cell and the voltage dividing circuit, meanwhile, the controller is used for controlling the on-off states of the voltage dividing circuit and the isolating circuit, so that the detection circuit is in different voltage dividing relations, and the insulation resistance value of the target battery cell in the battery cluster is determined based on the different voltage dividing relations, thereby realizing effective identification of abnormal points of the insulation resistance of the battery cluster, further accurately detecting the insulation resistance of the target battery cell in the battery cluster, realizing quick positioning, ensuring the insulation safety of specific abnormal resistance, avoiding the occurrence of safety accidents of an energy storage system caused by insulation abnormality, and further solving the technical problem of lower efficiency of detecting the insulation resistance in the battery cluster in the related technology.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
fig. 1 is a schematic diagram of a circuit for detecting insulation resistance in a battery cluster according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first voltage division state of a detection circuit for insulation resistance in a battery cluster according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a second voltage division state of a detection circuit for insulation resistance in a battery cluster according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a third voltage division state of a detection circuit for insulation resistance in a battery cluster according to an embodiment of the invention;
fig. 5 is a flowchart of a method of detecting insulation resistance in a battery cluster according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an apparatus for detecting insulation resistance in a battery pack according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise 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.
According to an embodiment of the present application, there is provided a circuit for detecting insulation resistance in a battery cluster, fig. 1 is a circuit for detecting insulation resistance in a battery cluster according to the present application, as shown in fig. 1, the circuit for detecting insulation resistance in a battery cluster including:
The voltage dividing circuit 102 is connected with the positive electrode of the battery cluster 104 to be subjected to insulation resistance detection at a first end and connected with the negative electrode of the battery cluster at a second end;
the isolation circuit 106, a first end of the isolation circuit is connected with a positive electrode of a target battery cell 108 in the battery cluster, a second end of the isolation circuit is connected with a third end of the voltage dividing circuit, and a third end of the isolation circuit is grounded, wherein the battery cluster comprises a plurality of battery cells, and the target battery cell is used for representing the battery cell to be subjected to insulation resistance detection in the battery cluster;
and the controller is connected with the voltage dividing circuit and the isolation circuit and is used for controlling the on-off states of the voltage dividing circuit and the isolation circuit so as to determine the insulation resistance value of the positive electrode of the target battery cell.
The battery cluster can be a larger battery pack formed by a plurality of battery units in a certain serial-parallel connection mode so as to meet specific energy and power requirements. The specific number, type, and series-parallel manner of the battery cells is determined according to the required energy capacity and output voltage.
The above-mentioned target battery cell may refer to a battery cell to be subjected to insulation resistance detection in a battery cluster, or may be a specific electrical core point, and a specific position of the target battery cell in the battery cluster may be determined according to actual needs.
In an optional experimental example, a plurality of battery cells are connected together in series-parallel to form a battery cluster, and in related applications, an insulation resistance value of a certain battery cell, namely, an insulation resistance value of a target battery cell needs to be obtained, wherein the total positive or total negative insulation resistance value of the battery cluster to the ground is an important index for measuring insulation safety of the battery cluster, and each battery cell including the insulation resistance value of the target battery cell to the ground is required to be obtained and accords with a safety standard.
The voltage dividing circuit may be a circuit structure for reducing an input voltage in proportion to obtain different output voltages, and may include a resistor voltage dividing circuit, a capacitor voltage dividing circuit, a transformer voltage dividing circuit, a digital voltage dividing circuit, etc., where the specific design depends on a required output voltage range, a load requirement, and a working frequency of the circuit, and the voltage dividing circuit may be used for controlling an on-off state of the voltage dividing circuit to make the voltage dividing circuit in different voltage dividing states so as to determine a voltage dividing relationship, so as to determine an insulation resistance based on the voltage dividing relationship, and may also be used for reducing a voltage, amplifying a signal, linearizing a voltage, stabilizing a voltage, and protecting a circuit.
The isolation circuit may be a circuit structure for implementing electrical isolation between electrical systems or components, and may generate a corresponding output signal according to a specific input signal, so as to implement an electrical isolation function, where the isolation circuit may include, but is not limited to, transformer isolation, optocoupler isolation, capacitive isolation, and the like, and the function of the isolation circuit may include, but is not limited to, protecting equipment, protecting personnel safety, signal isolation, improving system stability, and the like.
The controller may refer to a circuit structure for controlling a detection circuit of insulation resistance in a battery cluster to perform battery insulation detection on a target battery cell, and may generate a corresponding output signal according to a specific input signal, so as to realize control of the insulation detection circuit, where the input signal may include, but is not limited to, current, temperature, voltage, etc., the controller may include, but is not limited to, a switch circuit, a logic circuit, a timing circuit, a comparator circuit, etc., and the controller may function as, but is not limited to, a control detection circuit, a real-time monitoring of a battery cluster state, fault diagnosis and alarm, and data recording and analysis, etc.
In an alternative embodiment, fig. 2 is a schematic diagram of a first voltage division state of a detection circuit of an insulation resistor in a battery cluster according to an embodiment of the present invention, where the first voltage division state indicates that the first voltage division circuit and the second voltage division circuit are in a voltage division state, the first voltage division circuit includes a first resistor Rp, a second switch Sp, a second resistor Rps and a controller, the second voltage division circuit includes a third resistor Rn, a third switch Sn, a fourth resistor Rns and a controller, the isolation circuit includes an isolation resistor Riso, a first switch Sw and a controller, the isolation circuit is grounded, an insulation fault point voltage value is Ux, a test procedure starts, the second switch Sp is closed, the third switch Sn is opened, the circuit state is as shown in fig. 2, when the detection circuit of the insulation resistor in the battery cluster is in the first voltage division state, resistance values of the first resistor Rp, the second resistor Rp, the third resistor Rn and the fourth resistor Rns in the detection circuit are known, and the corresponding first voltage Vns and the second voltage vpns can be obtained by calculating the actual voltage of the battery cluster through detecting the voltage vpns,
Ub=Vps*(Rp+Rps)/Rps+Vns*(Rn+Rns)/Rns;
Thereby obtaining the actual voltage value Ub of the battery cluster.
The embodiment of the invention discloses a detection circuit of insulation resistance in a battery cluster, which comprises a voltage division circuit, an isolation circuit, a first end of the voltage division circuit is connected with the positive electrode of the battery cluster to be subjected to insulation resistance detection, a second end of the voltage division circuit is connected with the negative electrode of the battery cluster, the first end of the isolation circuit is connected with the positive electrode of a target battery cell in the battery cluster, the second end of the isolation circuit is connected with the third end of the voltage division circuit, the third end of the isolation circuit is grounded, the battery cluster comprises a plurality of battery cells, the target battery cell is used for representing the battery cells to be subjected to insulation resistance detection in the battery cluster, and a controller is connected with the voltage division circuit and the isolation circuit and used for controlling the on-off states of the voltage division circuit and the isolation circuit so as to determine the insulation resistance value of the positive electrode of the target battery cell. It is easy to notice that, the detection circuit of insulation resistance in the battery cluster is provided with the voltage dividing circuit at two ends of the battery cluster, the isolating circuit is arranged between the target battery cell and the voltage dividing circuit, meanwhile, the controller is used for controlling the on-off states of the voltage dividing circuit and the isolating circuit, so that the detection circuit is in different voltage dividing relations, and the insulation resistance value of the target battery cell in the battery cluster is determined based on the different voltage dividing relations, thereby realizing effective identification of abnormal points of the insulation resistance of the battery cluster, further accurately detecting the insulation resistance of the target battery cell in the battery cluster, realizing quick positioning, ensuring the insulation safety of specific abnormal resistance, avoiding the occurrence of safety accidents of an energy storage system caused by insulation abnormality, and further solving the technical problem of lower efficiency of detecting the insulation resistance in the battery cluster in the related technology.
Optionally, the isolation circuit comprises an isolation resistor, a first switch and a controller, wherein the first end of the isolation resistor is connected with the first end of the isolation circuit, the second end of the isolation resistor is connected with the third end of the isolation circuit, the first end of the first switch is connected with the second end of the isolation circuit, the second end of the first switch is connected with the third end of the isolation circuit, and the controller is connected with the first switch and used for controlling the opening and closing states of the first switch to control the opening and closing states of the isolation circuit.
The isolation resistor can be an element for isolating current flowing between different parts in a circuit, the isolation resistor can play a role in isolation and protection in the circuit, interference or short circuit of current between different parts is prevented, the isolation resistor element can be made of insulating materials, different parts in the circuit can be effectively isolated, stability and safety of the circuit are guaranteed, and the type and the resistance of the isolation resistor can be determined according to the requirements of parameters such as working voltage, current and power of the circuit, and the like, so that the isolation resistor is not limited.
In an alternative embodiment, the isolation circuit can maintain the electrical isolation between the first voltage division circuit and the second voltage division circuit, and the safety, reliability and stability of the circuit system are improved while the detection of the isolation resistance value is realized.
Optionally, the voltage dividing circuit comprises a first voltage dividing circuit, a second voltage dividing circuit and a controller, wherein the first end of the first voltage dividing circuit is connected with the first end of the voltage dividing circuit, the first end of the second voltage dividing circuit is connected with the second end of the voltage dividing circuit, the second end of the second voltage dividing circuit is connected with the second end of the first voltage dividing circuit, and the controller is connected with the first voltage dividing circuit and the second voltage dividing circuit and used for controlling the on-off states of the first voltage dividing circuit and the second voltage dividing circuit.
The first voltage dividing circuit and the second voltage dividing circuit may refer to voltage dividing circuits with different resistance values and voltage outputs, may be used for generating reference voltages with different levels, or may be used for amplifying and adjusting the amplitude of signals, may be used independently, or may be used in combination to implement more complex voltage regulation or signal processing functions.
The controller can control the on-off states of the first voltage dividing circuit and the second voltage dividing circuit by controlling circuit elements such as a switch or a switch in the voltage dividing circuit for controlling the on-off of the circuit.
In an alternative embodiment, the voltage dividing circuit isolates the target cell from the actual total voltage of the battery cluster while providing a suitable voltage signal for use by the detection circuit when the target cell is detected for insulation by the detection circuit for insulation resistance in the battery cluster.
Optionally, the first voltage dividing circuit comprises a first resistor, a second switch, a second resistor and a controller, wherein the first end of the first resistor is connected with the first end of the first voltage dividing circuit, the first end of the second switch is connected with the second end of the first resistor, the first end of the second resistor is connected with the second end of the second switch, the second end of the second resistor is connected with the second end of the first voltage dividing circuit, and the controller is connected with the second switch and used for controlling the opening and closing states of the second switch to control the on-off states of the first voltage dividing circuit.
The first voltage dividing circuit may refer to a first voltage dividing portion in a circuit system having a plurality of voltage dividing cascades, and may be a circuit including a first resistor Rp, a second switch Sp, a second resistor Rps and a controller.
The types and the resistance values of the first resistor and the second resistor can be selected according to the system requirements, and are not limited herein.
In an alternative embodiment, fig. 3 is a schematic diagram of a second voltage division state of a detection circuit of an insulation resistance in a battery cluster according to an embodiment of the present invention, where the second voltage division state indicates that the first voltage division circuit and the isolation circuit are in a voltage division state, the first voltage division circuit includes a first resistance Rp, a second switch Sp, a second resistance Rps and a controller, the isolation circuit includes an isolation resistance Riso, a first switch Sw and a controller, the isolation circuit is grounded, the second voltage division circuit includes a third resistance Rn, a third switch Sn, a fourth resistance Rns and the controller, a test procedure starts, the second switch Sp is closed, the third switch Sn is opened, the first switch Sw is closed, a circuit state is as shown in fig. 3, when the detection circuit of the insulation resistance in the battery cluster is in the second voltage division state, a voltage value close to the battery cluster is measured, the insulation resistance Riso is the insulation resistance value, the insulation fault point voltage value is expressed as Ux, and thus an actual equation 1 is obtained by the voltage cluster Up ' close to the battery cluster Up and the voltage of the battery cluster Up ' close to the battery cluster Up ' is calculated by the resistance value of the first resistance Rp and the second resistance s:
(Rp+Rps)/Riso=Up'/(Ub-Ux-Up');
wherein Riso is an insulation resistance value, ux is an insulation fault point voltage value.
Optionally, the second voltage dividing circuit comprises a third resistor, a third switch, a fourth resistor and a controller, wherein the first end of the third resistor is connected with the first end of the second voltage dividing circuit, the first end of the third switch is connected with the second end of the third resistor, the first end of the fourth resistor is connected with the second end of the third switch, the second end of the fourth resistor is connected with the second end of the second voltage dividing circuit, and the controller is connected with the third switch and used for controlling the opening and closing states of the third switch to control the on-off states of the second voltage dividing circuit.
The second voltage dividing circuit may be a second voltage dividing portion in a circuit system having a plurality of voltage dividing cascades, and may be a circuit including a third resistor Rn, a third switch Sn, a fourth resistor Rns and a controller.
The types and the resistance values of the third resistor and the fourth resistor can be selected according to the system requirements, and are not limited herein.
In an alternative embodiment, fig. 4 is a schematic diagram of a third voltage division state of a detection circuit of insulation resistance in a battery cluster according to an embodiment of the present invention, where the third voltage division state is used to indicate that the second voltage division circuit and the isolation circuit are in a voltage division state, the second voltage division circuit includes a third resistor Rn, a third switch Sn, a fourth resistor Rns and a controller, the isolation circuit includes an isolation resistor Riso, a first switch Sw and a controller, the isolation circuit is grounded, the first voltage division circuit includes a first resistor Rp, a second switch Sp, a second resistor Rps and a controller, a test procedure begins by opening the second switch Sp, closing the third switch Sn, closing the first switch Sw, when the detection circuit of the insulation resistance in the battery cluster is in a third voltage division state, the circuit consists of a battery pack, an isolation resistance, a first switch, a third resistance, a third switch, a fourth resistance and a controller, wherein the voltage value close to the total negative voltage value Un 'of the battery cluster is equal to the insulation resistance value required by the isolation resistance Riso, and the voltage value of an insulation fault point corresponding to the isolation resistance Riso is Ux, so that an equation 2 comprising an unknown insulation resistance value Riso and an insulation fault point voltage value Ux can be obtained through the resistance values of the third resistance Rn and the fourth resistance Rns and the voltage value Un' close to the total negative voltage value of the battery cluster, (Rn+ Rns)/riso=Un '/(Ux-Un'); simultaneous equations 1 and 2 can calculate the insulation resistance Riso and the insulation fault point voltage Ux, namely:
Riso={(Rp+Rps)*Up*Un+(Rp+Rps)*Up2-(Rp+Rps)*Up*Ub-
[(Up*Ub-Up*Un-Up2)2-4*Up*Un]^(1/2)}/-4*Up*Un;
Ux=Un'*Ub/(Up'+Un');
Thus, the insulation resistance value Riso of the target battery unit and the insulation fault point voltage value Ux are obtained, and the specific insulation abnormal cell point can be positioned according to the Ux and the total string number of the system battery cluster.
According to another aspect of embodiments of the present invention, there is also provided a method of detecting insulation resistance in a battery cluster, it being noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical sequence is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in a different order than that illustrated herein.
Fig. 5 is a flowchart of a method for detecting insulation resistance in a battery cluster according to an embodiment of the present invention, as shown in fig. 5, the method comprising the steps of:
Step S502, the on-off states of the voltage dividing circuit and the isolation circuit are controlled by the controller, so that the detection circuit of the insulation resistor is in different voltage dividing states, and a plurality of voltages corresponding to the different voltage dividing states are obtained.
The plurality of voltages may be voltages at two ends of each corresponding electrical element when the detection circuit is in different voltage division states, and may be resistor voltage, capacitor voltage, memory voltage, etc., which are determined according to specific requirements, and are not limited herein.
In an optional embodiment, the method for detecting insulation resistance in a battery cluster according to the present application controls the on-off state of the detection circuitry through the controller, and the on-off state of the three circuits includes a first voltage division state, a second voltage division state, and a third voltage division state, where the first voltage division circuit and the second voltage division circuit are in a voltage division state in the first voltage division state, the test procedure is started, the second switch Sp is closed, the third switch Sn is opened, and at this time, the circuit is composed of a battery pack, a first resistor, a second switch, a second resistor, a third switch, a fourth resistor and a controller, wherein the resistance values of the first resistor Rp, the second resistor Rps, the third resistor Rn and the fourth resistor Rns in the detection circuit of the insulation resistor in the battery cluster are known in the first voltage dividing state, the corresponding first voltage Vps and second voltage Vns are obtained through detection, and therefore the actual voltage Ub of the battery cluster can be calculated through the data, namely Ub=Vps (Rp+Rps)/Rps+Vns (Rn+ Rns)/Rns, and the actual voltage Ub of the battery cluster is obtained.
In an alternative embodiment, in the second voltage division state, the first voltage division circuit and the isolation circuit are in a voltage division state, the test procedure starts, the second switch Sp is closed, the third switch Sn is opened, the first switch Sw is closed, at this time, the circuit is composed of a battery pack, a first resistor, a second switch, a second resistor, an isolation resistor, the first switch and a controller, wherein the voltage value Up 'close to the total positive of the battery cluster can be obtained by measurement, the isolation resistor Riso is the required insulation resistance value, and the insulation fault point voltage value is expressed as Ux, so that equation 1 including the insulation resistance value Riso and the insulation fault point voltage value Ux, (rp+rps)/riso=up'/(Ub-Ux-Up ') can be obtained by the resistance values of the first resistor Rp and the second resistor Rp, close to the total positive voltage value Up' of the battery cluster and the actual voltage Ub of the battery cluster. In the third voltage division state, the second voltage division circuit and the isolation circuit are in a voltage division state, the test flow starts, the second switch Sp is opened, the third switch Sn is closed, the first switch Sw is closed, at this time, the circuit is composed of a battery pack, an isolation resistor, the first switch, the third resistor, the third switch, the fourth resistor and a controller, wherein the isolation resistor Riso is a required insulation resistance value near the total negative voltage value of the battery cluster, the insulation fault point voltage value corresponding to the isolation resistor Riso is Ux, and therefore, an equation 2 comprising an unknown insulation resistance value Riso and the insulation fault point voltage value Ux can be obtained through the resistance values of the third resistor Rn and the fourth resistor Rns and the voltage value near the total negative voltage value Un ' of the battery cluster, (rn+ Rns)/riso=un '/(Ux-Un '), and the equation 1 and the equation 2 are combined to obtain the insulation fault point voltage value Ux, namely:
Ux=Un'*Ub/(Up'+Un');
thus, the insulation fault point voltage value Ux and a plurality of voltages corresponding to different voltage division states are obtained.
Step S504, determining an insulation resistance value of the positive electrode of the target battery cell in the battery cluster based on the plurality of voltages.
In an alternative embodiment, the simultaneous equation 1 (rp+rps)/riso=up '/(Ub-Ux-Up'), equation 2 (rn+ Rns)/riso=un '/(Ux-Un'), and the insulation resistance Riso can be found, that is:
Riso={(Rp+Rps)*Up*Un+(Rp+Rps)*Up2-(Rp+Rps)*Up*Ub-
[(Up*Ub-Up*Un-Up2)2-4*Up*Un]^(1/2)}/-4*Up*Un;
thus, the positive insulation resistance value Riso of the target battery unit is obtained, and the specific insulation abnormal cell point can be positioned according to the insulation fault point voltage value Ux obtained in the last step and the total string number of the system battery clusters.
Optionally, the plurality of voltages include a first voltage and a second voltage, and the on-off states of the voltage dividing circuit and the isolation circuit are controlled by the controller, so that the detection circuit of the insulation resistor is in different voltage dividing states, and a plurality of voltages corresponding to the different voltage dividing states are obtained, including: the method comprises the steps of controlling a first voltage dividing circuit and a second voltage dividing circuit in a voltage dividing circuit to be in a connection state, controlling an isolating circuit to be in a disconnection state, enabling a detection circuit of an insulation resistor to be in a first voltage dividing state, and acquiring a first voltage and a second voltage, wherein the first voltage dividing state is used for representing the state that the first voltage dividing circuit and the second voltage dividing circuit are in voltage dividing, the first voltage is used for representing the potential difference of a second resistor flowing in the first voltage dividing state, and the second voltage is used for representing the potential difference of a fourth resistor flowing in the first voltage dividing state.
The first voltage may be a potential difference flowing through the second resistor Rps in the first voltage division state, and the second voltage may be a potential difference flowing through the fourth resistor Rns in the first voltage division state.
In an alternative embodiment, the test procedure starts by closing the second switch Sp and the third switch Sn, opening the first switch Sw, and making the detection circuit in the first voltage dividing state, where the resistance values of the first resistor Rp, the second resistor Rps, the third resistor Rn, and the fourth resistor Rns are known, and the corresponding first voltage Vps and second voltage Vns are obtained by detection, so that the actual voltage Ub of the battery cluster can be calculated by the above data, that is, ub=vps (rp+rps)/rps+vns (rn+ Rns)/Rns, thereby obtaining the actual voltage Ub of the battery cluster.
Optionally, the plurality of voltages include a third voltage, and the controller is used for controlling the on-off states of the voltage dividing circuit and the isolation circuit, so that the detection circuit of the insulation resistor is in different voltage dividing states, and the plurality of voltages corresponding to the different voltage dividing states are obtained, including: the first voltage dividing circuit and the isolation circuit are controlled to be in a connection state, the second voltage dividing circuit is controlled to be in a disconnection state, so that the detection circuit of the insulation resistor is in a second voltage dividing state, and a third voltage is obtained, wherein the second voltage dividing state is used for indicating that the first voltage dividing circuit and the isolation circuit are in a voltage dividing state, and the third voltage is used for indicating a voltage value at the positive electrode of a battery cluster of the battery cluster in the second voltage dividing state.
In an alternative embodiment, the test procedure starts, the second switch Sp is closed, the third switch Sn is opened, the first switch Sw is closed, and the detection circuit is in a second voltage division state, wherein the total positive voltage value Up 'close to the battery cluster can be obtained through measurement, the isolation resistor Riso is the required insulation resistance value, and the insulation fault point voltage value is denoted Ux, so that the first voltage division relation (rp+rps)/riso=up'/(Ub-Ux-Up ') containing the unknown insulation resistance value Riso and the insulation fault point voltage value Ux can be obtained through the resistance values of the first resistor Rp and the second resistor Rps, the total positive voltage value Up' close to the battery cluster and the actual voltage Ub of the battery cluster.
Optionally, the plurality of voltages includes a fourth voltage, and the controller controls the on-off states of the voltage dividing circuit and the isolation circuit, so that the detection circuit of the insulation resistor is in different voltage dividing states, and obtains a plurality of voltages corresponding to the different voltage dividing states, including: the second voltage dividing circuit and the isolation circuit are controlled to be in a connection state, the first voltage dividing circuit is controlled to be in a disconnection state, so that the detection circuit of the insulation resistor is in a third voltage dividing state, and a fourth voltage is obtained, wherein the third voltage dividing state is used for indicating that the second voltage dividing circuit and the isolation circuit are in a voltage dividing state, and the fourth voltage is used for indicating a voltage value at the negative electrode of a battery cluster of the battery cluster in the third voltage dividing state.
In an alternative embodiment, the test procedure starts, the second switch Sp is opened, the third switch Sn is closed, the first switch Sw is closed, and the detection circuit is in a second voltage division state, wherein the isolation resistor Riso is the insulation resistance value required near the total negative voltage value Un of the battery cluster, and the insulation fault point voltage value corresponding to the isolation resistor Riso is Ux, so that a second voltage division relation (rn+ Rns)/riso=un '/(Ux-Un ') comprising the unknown insulation resistance value Riso and the insulation fault point voltage value Ux can be obtained through the resistance values of the third resistor Rn and the fourth resistor Rns and the voltage value Un ' near the total negative voltage value Un of the battery cluster.
Optionally, the plurality of voltages comprise a first voltage, a second voltage, a third voltage and a fourth voltage, the insulation resistance value of the positive electrode of the target battery cell in the battery cluster is determined based on the plurality of voltages, the insulation resistance value comprises the steps of determining the actual voltage of the battery cluster based on the first voltage, the second voltage, the first resistor, the second resistor, the third resistor and the fourth resistor, constructing a first voltage division relation in a second voltage division state based on the actual voltage, the third voltage, the first resistor and the second resistor, constructing a second voltage division relation in a third voltage division state based on the actual voltage, the fourth voltage, the third resistor and the fourth resistor, and determining the insulation resistance value based on the first voltage division relation and the second voltage division relation.
In an alternative embodiment, after the test is finished, the actual voltage value Ub of the battery cluster, the first partial pressure relation and the second partial pressure relation are obtained through the steps, and the two partial pressure relations are combined, so that the digital insulation resistance value Riso and the insulation fault point voltage value Ux are obtained.
According to another aspect of the embodiments of the present invention, there is further provided a device for detecting insulation resistance in a battery cluster, where the device may execute the method for detecting insulation resistance in a battery cluster in the foregoing embodiments, and a specific implementation method and a preferred application scenario are the same as those in the foregoing embodiments, and are not described herein in detail.
Fig. 6 is a schematic diagram of an apparatus for detecting insulation resistance in a battery cluster according to an embodiment of the present application, as shown in fig. 6, the apparatus includes a control module 602, an acquisition module 604, and a determination module 606.
The device comprises a control module 602, an acquisition module 604 and a determination module 606, wherein the control module is used for controlling the on-off states of a voltage dividing circuit and an isolation circuit through a controller so that the detection circuits of the insulation resistance are in different voltage dividing states, the acquisition module 604 is used for acquiring a plurality of voltages corresponding to the different voltage dividing states, the voltage dividing states are used for representing the voltage dividing states when the detection circuits of the insulation resistance are in different communication states and are connected with a battery cluster, and the determination module 606 is used for determining the insulation resistance value of the positive electrode of a target battery cell in the battery cluster based on the plurality of voltages.
In the above embodiment of the present application, the control module includes a first control unit, a second control unit, and a third control unit.
The first control unit is used for controlling a first voltage dividing circuit and a second voltage dividing circuit in the voltage dividing circuit to be in a connection state and controlling the isolation circuit to be in a disconnection state so as to enable the detection circuit of the insulation resistor to be in the first voltage dividing state, the second control unit is used for controlling the first voltage dividing circuit and the isolation circuit to be in a connection state and controlling the second voltage dividing circuit to be in a disconnection state so as to enable the detection circuit of the insulation resistor to be in the second voltage dividing state, and the third control unit is used for controlling the second voltage dividing circuit and the isolation circuit to be in a connection state and controlling the first voltage dividing circuit to be in a disconnection state so as to enable the detection circuit of the insulation resistor to be in the third voltage dividing state.
In the above embodiment of the present application, the acquisition module includes a first acquisition unit, a second acquisition unit, and a third acquisition unit.
The first acquisition unit is used for acquiring a first voltage and a second voltage when the detection circuit of the insulation resistance controlled by the first control unit is in a first voltage division state, the second acquisition unit is used for acquiring a third voltage when the detection circuit of the insulation resistance controlled by the second control unit is in a second voltage division state, and the third acquisition unit is used for acquiring a third voltage when the detection circuit of the insulation resistance controlled by the third control unit is in a second voltage division state.
According to another aspect of the embodiment of the invention, the electronic equipment further provides the electronic equipment, which comprises a memory and a processor, wherein the memory stores an executable program, and the processor is used for running the program, and the method for detecting the insulation resistance in the battery cluster is executed when the program runs.
The memory in the steps can be one of a random access memory RAM, a read only memory ROM, a nonvolatile memory and the like, and is used for storing programs and data in the electronic device, and is a temporary or permanent storage space, so that a processor can access and execute information stored in the memory.
According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium including a stored executable program, wherein a device in which the executable program is controlled to operate executes the method for detecting insulation resistance in the battery cluster.
The computer readable storage medium in the above steps may be a physical device for storing data, including semiconductors, magnetic cores, drums, tapes, laser discs, etc., with different media having different storage densities, access speeds, and cost effectiveness, and may be temporary or permanent, depending on the manner and purpose of storing the data, allowing the computer system to read and access the information stored therein.
According to another aspect of the embodiments of the present invention, there is also provided a computer program product, which when executed by a processor, implements the method for detecting insulation resistance in a battery cluster described above.
A computer program product in the foregoing steps may refer to a software product consisting of a series of computer programs, code and related documents, written to achieve specific functions and needs, typically including application programs, operating systems, database management systems, etc., the core of the computer program product being a collection of codes for performing tasks according to specific rules and logic.
In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in other manners, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be formed in one processing unit, or each unit may exist alone physically, or two or more units may be formed in one unit. The above-described units may be implemented in hardware or in software functional units.
The elements may be stored in a computer readable storage medium if implemented as software functional units and sold or used as stand-alone products. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. The storage medium includes a U disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, etc. which can store the program code.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A circuit for detecting insulation resistance in a battery cluster, comprising:
The first end of the voltage dividing circuit is connected with the positive electrode of the battery cluster to be subjected to insulation resistance detection, and the second end of the voltage dividing circuit is connected with the negative electrode of the battery cluster;
The first end of the isolation circuit is connected with the positive electrode of a target battery cell in the battery cluster, the second end of the isolation circuit is connected with the third end of the voltage dividing circuit, and the third end of the isolation circuit is grounded, wherein the battery cluster comprises a plurality of battery cells, and the target battery cell is used for representing the battery cell to be subjected to insulation resistance detection in the battery cluster;
The controller is connected with the voltage dividing circuit and the isolation circuit and used for controlling the on-off states of the voltage dividing circuit and the isolation circuit to obtain a first voltage dividing relation and a second voltage dividing relation, and determining the insulation resistance value of the positive electrode of the target battery cell based on the first voltage dividing relation and the second voltage dividing relation;
the voltage dividing circuit comprises a first voltage dividing circuit, wherein the first end of the first voltage dividing circuit is connected with the first end of the voltage dividing circuit; the first end of the first resistor is connected with the first end of the first voltage dividing circuit, the first end of the second resistor is connected with the second end of the first resistor, the first end of the second resistor is connected with the second end of the second switch, the second end of the second resistor is connected with the second end of the first voltage dividing circuit, the controller is connected with the second switch and used for controlling the on-off state of the first voltage dividing circuit and the second voltage dividing circuit, the first voltage dividing circuit comprises a first resistor, the first end of the first resistor is connected with the first end of the first voltage dividing circuit, the second switch comprises a second resistor, the first end of the second resistor is connected with the second end of the first resistor, the second end of the second resistor is connected with the second end of the first voltage dividing circuit, the controller is connected with the second switch and used for controlling the on-off state of the second switch, the third switch comprises a third resistor, the third end of the second resistor is connected with the third end of the second voltage dividing circuit, the switching state of the third switch is controlled to control the on-off state of the second voltage dividing circuit;
Wherein the first voltage division relation is expressed as (rp+rps)/riso=up '/(Ub-Ux-Up'), the second voltage division relation is expressed as (rn+ Rns)/riso=un '/(Ux-Un'), wherein Rp is a first resistor in the voltage division circuit, rps is a second resistor in the voltage division circuit, up 'is a voltage value close to the total positive of the battery cluster, ub is an actual voltage of the battery cluster, rn is a third resistor in the voltage division circuit, rns is a fourth resistor in the voltage division circuit, un' is a voltage value close to the total negative of the battery cluster, riso is the insulation resistance value, ux is an insulation fault point voltage value, the controller is further configured to determine the insulation fault point voltage value Ux based on the first voltage division relation and the second voltage division relation, and determine the insulation fault point voltage value Ux based on the insulation fault point voltage value Ux and the total number of the battery clusters.
2. The circuit for detecting insulation resistance in a battery cluster according to claim 1, wherein the isolation circuit comprises:
The first end of the isolation resistor is connected with the first end of the isolation circuit, and the second end of the isolation resistor is connected with the third end of the isolation circuit;
The first end of the first switch is connected with the second end of the isolation circuit, and the second end of the first switch is connected with the third end of the isolation circuit;
The controller is connected with the first switch and used for controlling the opening and closing states of the first switch so as to control the on-off states of the isolation circuit.
3. A method for detecting insulation resistance in a battery cluster, applied to the detection circuit for insulation resistance in a battery cluster according to any one of claims 1 to 2, the method comprising:
The method comprises the steps that the on-off states of a voltage dividing circuit and an isolation circuit are controlled through a controller, so that the detection circuit of the insulation resistor is in different voltage dividing states, and a plurality of voltages corresponding to the different voltage dividing states are obtained, wherein the voltage dividing states are used for representing the voltage dividing states when the detection circuit of the insulation resistor is in different communication states and is connected with a battery cluster;
and determining an insulation resistance value of a positive electrode of a target battery cell in the battery cluster based on the plurality of voltages.
4. The method for detecting insulation resistance in a battery cluster according to claim 3, wherein the plurality of voltages includes a first voltage and a second voltage, the on-off states of the voltage dividing circuit and the isolation circuit are controlled by the controller, so that the detection circuit of insulation resistance is in different voltage dividing states, and the plurality of voltages corresponding to the different voltage dividing states are obtained, including:
And controlling a first voltage dividing circuit and a second voltage dividing circuit in the voltage dividing circuit to be in a connection state, and controlling the isolating circuit to be in a disconnection state, so that the detection circuit of the insulation resistor is in a first voltage dividing state, and the first voltage and the second voltage are acquired, wherein the first voltage dividing state is used for indicating that the first voltage dividing circuit and the second voltage dividing circuit are in a voltage dividing state, the first voltage is used for indicating the potential difference of the second resistor flowing in the first voltage dividing state, and the second voltage is used for indicating the potential difference of the fourth resistor flowing in the first voltage dividing state.
5. The method for detecting insulation resistance in a battery cluster according to claim 4, wherein the plurality of voltages includes a third voltage, and the controller controls on-off states of the voltage dividing circuit and the isolation circuit to make the detection circuit of insulation resistance in different voltage dividing states and obtain the corresponding plurality of voltages in the different voltage dividing states, comprising:
And controlling the first voltage dividing circuit and the isolation circuit to be in a connection state, controlling the second voltage dividing circuit to be in a disconnection state so as to enable the detection circuit of the insulation resistor to be in a second voltage dividing state and acquire the third voltage, wherein the second voltage dividing state is used for indicating that the first voltage dividing circuit and the isolation circuit are in a voltage dividing state, and the third voltage is used for indicating a voltage value at the positive electrode of the battery cluster in the second voltage dividing state.
6. The method for detecting insulation resistance in a battery cluster according to claim 5, wherein the plurality of voltages includes a fourth voltage, and the controller controls the on-off states of the voltage dividing circuit and the isolation circuit so that the detection circuit of insulation resistance is in different voltage dividing states, and obtains the corresponding plurality of voltages in the different voltage dividing states, including:
And controlling the second voltage dividing circuit and the isolating circuit to be in a connection state, controlling the first voltage dividing circuit to be in a disconnection state, enabling the detection circuit of the insulation resistor to be in a third voltage dividing state, and acquiring the fourth voltage, wherein the third voltage dividing state is used for indicating that the second voltage dividing circuit and the isolating circuit are in a voltage dividing state, and the fourth voltage is used for indicating a voltage value at the cathode of the battery cluster in the third voltage dividing state.
7. The method of detecting insulation resistance in a battery cluster according to claim 6, wherein the plurality of voltages includes a first voltage, a second voltage, a third voltage, and a fourth voltage, and determining an insulation resistance value of a positive electrode of a target cell in the battery cluster based on the plurality of voltages comprises:
Determining an actual voltage of the battery cluster based on the first voltage, the second voltage, the first resistance, the second resistance, the third resistance, and the fourth resistance;
constructing a first partial pressure relation in a second partial pressure state based on the actual voltage, the third voltage, the first resistor and the second resistor;
constructing a second voltage division relation in a third voltage division state based on the actual voltage, the fourth voltage, the third resistor and the fourth resistor;
The insulation resistance value is determined based on the first partial pressure relation and the second partial pressure relation.
8. An electronic device, comprising:
A memory storing an executable program;
A processor for executing the program, wherein the program executes the method for detecting insulation resistance in a battery cluster according to any one of claims 3 to 7 when executed.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored executable program, wherein the executable program, when run, controls a device in which the storage medium is located to perform the method for detecting insulation resistance in a battery cluster according to any one of claims 3 to 7.
10. A computer program product comprising a computer program which, when executed by a processor, implements a method of detecting insulation resistance in a battery cluster according to any one of claims 3 to 7.
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| KR102731446B1 (en) * | 2019-11-18 | 2024-11-15 | 주식회사 엘지에너지솔루션 | Apparatus for estimating Insulation Resistance and Battery System using the same |
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| CN103869166A (en) * | 2012-12-18 | 2014-06-18 | 中信国安盟固利动力科技有限公司 | Measurement and fault point positioning device of insulation resistance of battery system |
| CN220913315U (en) * | 2023-09-28 | 2024-05-07 | 力神（青岛）新能源有限公司 | Battery pack insulation detection circuit and device, battery management system and electric automobile |
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| CN118518939A (en) | 2024-08-20 |
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