High-voltage battery insulation detection system and method

Abstract

The invention discloses a high-voltage battery insulation detection system and method.The system comprises a high-voltage battery pack and a plurality of loads connected with the high-voltage battery pack and further comprises a detection module and a calculation module, and the detection module comprises an insulation detector, a plurality of sets of load marking resistors and a voltage detector; the insulation detector is respectively connected with the positive and negative electrodes of the high-voltage battery pack and the insulation shell, and monitors the insulation resistance and leakage current of the positive and negative electrodes of the high-voltage battery pack to the insulation shell; the plurality of groups of load marking resistors are respectively connected to the positive and negative electrodes of the plurality of loads, and the resistance values of the plurality of groups of load marking resistors are different; the voltage detector is used for monitoring the voltage on the plurality of groups of load marking resistors; the calculation module calculates and judges the specific position of an insulation fault according to the magnitude of the leakage current monitored by the insulation detector and the voltage on the load marking resistor monitored by the voltage detector, and compared with a traditional insulation detection method, the insulation detection method is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of insulation detection of high-voltage batteries, and in particular to a high-voltage battery insulation detection system and method. Background Art

[0002] With the development of electronic and electrical systems in various industries, voltage platforms of hundreds of volts are increasingly used in electrical systems. The electrical insulation system is an important project to ensure the high voltage safety of the voltage platform. In common electrical systems, the common causes of insulation failure, in addition to design and manufacturing problems, generally include thermal aging, light aging, material brittle cracking in low temperature environments, friction damage caused by improper fixation, etc.

[0003] Insulation is the practice of wrapping a layer of non-conductive material on the surface of a live device in order to isolate people and other charged or uncharged structures. There are several parameters for comparing the insulation capabilities of different insulating materials or systems: insulation resistance and leakage current, which are generally used to indicate insulation test results. Insulation resistance refers to the resistance value of an insulating medium. It is a physical quantity that measures the insulation quality of an insulating medium. In common measurement methods, it is expressed as the resistance value between a live device and a reference platform such as a shell or the earth. Due to its large value, the unit is often expressed in "megohms". When talking about the insulation performance of an electrical system, leakage current refers to the current flowing through the surface of the insulating material inside the system. The larger the value, the worse the insulation performance of the system. The unit is generally "milliamperes".

[0004] In the existing high-voltage battery insulation detection technology, insulation detection devices are usually set at the positive and negative parts of the electrical system to perform insulation detection on the system. However, the common insulation detection system cannot determine the specific location where the poor insulation occurs, nor does it have an early warning function.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] In order to solve the problems raised in the above background technology, the present invention proposes a high-voltage battery insulation detection system and method. The potential change of the load marking resistor is equivalent to the insulation fault condition of the load. Compared with the traditional insulation detection method, the present invention can more quickly locate the specific location of the insulation fault and can provide early warning of the insulation fault to a certain extent.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the present invention proposes a high-voltage battery insulation detection system on the one hand. In the technical solution of the present invention, the high-voltage battery insulation detection system includes a high-voltage battery pack and a plurality of loads connected thereto, and also includes a detection module and a calculation module. The detection module includes an insulation detector, several groups of load marking resistors and a voltage detector. The insulation detector is respectively connected to the positive and negative electrodes of the high-voltage battery pack and the insulating shell to monitor the insulation resistance and leakage current of the positive and negative electrodes of the high-voltage battery pack to the insulating shell; the several groups of load marking resistors are respectively connected to the positive and negative electrodes of the multiple loads, wherein the resistance values ​​of the several groups of load marking resistors are different; the voltage detector is used to monitor the voltage on the several groups of load marking resistors;

[0008] Furthermore, in the technical solution of the present invention, the calculation module calculates and determines the specific location of the insulation fault according to the magnitude of the leakage current monitored by the insulation detector and the voltage on the load marking resistor monitored by the voltage detector.

[0009] Furthermore, in the technical solution of the present invention, the load has The load marking resistors are Group, The load marking resistor is connected to the Group load, The load marking resistors of the group include:

[0010] Load Marking Resistor , connected in The positive pole of the group load, Indicates The first load connected to the Group load marking resistor ;

[0011] Load Marking Resistor , connected in The negative pole of the group load, Indicates The first load connected to the Group load marking resistor ;

[0012] Among them The load marking resistor in the load marking resistor group and load marking resistor The resistance value is the same.

[0013] Further, in the technical solution of the present invention, the insulation tester is connected to the positive and negative electrodes of the high-voltage battery pack and the insulating shell respectively, wherein monitoring the insulation resistance and leakage current of the positive and negative electrodes of the high-voltage battery pack to the insulating shell includes:

[0014] Positive insulation resistance ;

[0015] Negative insulation resistance ;

[0016] Leakage Current .

[0017] Further, in the technical solution of the present invention, the voltage on the load marking resistor monitored by the voltage detector includes:

[0018] Load Marking Resistor Voltage , expressed as Group load marking resistor The voltage on

[0019] Load Marking Resistor Voltage , expressed as Group load marking resistor The voltage on.

[0020] Further, in the technical solution of the present invention, the calculation module calculates and determines the specific location of the insulation fault according to the magnitude of the leakage current monitored by the insulation detector and the voltage on the load marking resistor monitored by the voltage detector, specifically including:

[0021] In case of insulation fault:

[0022] The calculation module collects the load marker resistor voltage monitored by the voltage detector and load marker resistor voltage , and calculate:

[0023] ;

[0024] The calculation module collects the leakage current monitored by the insulation detector ,judge:

[0025] like , then There is an insulation fault in the group load.

[0026] Another aspect of the present invention further provides a high-voltage battery insulation detection method, including a high-voltage battery insulation detection system as described above, and the high-voltage battery insulation detection method specifically includes the following contents:

[0027] S1. Insulation detection:

[0028] The insulation resistance of the positive and negative electrodes of the high-voltage battery pack to the insulating shell is monitored by an insulation tester, including the insulation resistance of the positive electrode. And negative insulation resistance , the positive insulation resistance to be monitored Insulation resistance qualified value For comparison:

[0029] when , that is, no insulation fault occurs;

[0030] when , that is, insulation failure occurs;

[0031] In the formula It is expressed as the qualified value of insulation resistance, that is, the minimum value of insulation resistance allowed when no insulation fault occurs;

[0032] S2. Insulation fault location:

[0033] when , that is, when insulation fault occurs:

[0034] The voltage detector monitors the Group load marking resistor voltage, where Set the load mark resistor voltage to the load mark resistor voltage and load marker resistor voltage ,calculate:

[0035] ;

[0036] Collect leakage current monitored by insulation detector when insulation fault occurs ,judge:

[0037] like , then in Insulation fault occurs at the group load;

[0038] S3, insulation fault warning:

[0039] when , that is, when there is no insulation fault:

[0040] Monitoring leakage current range,

[0041] , where It is expressed as the minimum value of the leakage current monitored when no insulation fault occurs. It is expressed as the maximum value of the leakage current monitored when no insulation fault occurs; it is calculated as:

[0042] ;

[0043] That is, by monitoring the load marker resistor voltage and load marker resistor voltage Insulation fault warning is carried out. In There is no risk of insulation failure in the interval. Beyond There is a risk of insulation failure when the

[0044] Effective gain: In summary, the present invention proposes a high-voltage battery insulation detection system and method. In the technical scheme of the present invention, it includes a detection module and a calculation module. In the loop composed of a high-voltage battery pack and multiple groups of loads, the detection module uses multiple groups of load marking resistors to be respectively connected to the positive and negative poles of multiple loads, and judges whether there is an insulation fault at the load by referring to the method of load marking resistors. That is, when an insulation fault occurs at the load, a certain potential difference will be formed at the positive and negative ends of the load due to the leakage current. The potential difference and the magnitude of the leakage current are monitored. The calculation module can calculate the correlation between the leakage current, the potential difference and whether there is an insulation fault, and further realize the insulation detection of the loop composed of the high-voltage battery pack and multiple groups of loads, that is, the potential change of the load marking resistor is equivalent to the insulation fault of the load. Compared with the traditional insulation detection method, the present invention can locate the specific location of the insulation fault more quickly and can provide early warning of the insulation fault to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic diagram of a high-voltage battery insulation detection system and method according to the present invention Figure 1 ;

[0046] Figure 2 A schematic diagram of a high-voltage battery insulation detection system and method according to the present invention Figure 2 . DETAILED DESCRIPTION

[0047] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0049] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] In addition, in the description of the present invention, “several” means two or more than two, unless otherwise clearly and specifically defined.

[0051] In order to solve the problems raised in the above-mentioned background technology, on the one hand, an embodiment of the present invention proposes a high-voltage battery insulation detection system, in which a high-voltage battery insulation detection system includes a high-voltage battery pack and multiple loads connected thereto, and also includes a detection module and a calculation module, wherein the detection module includes an insulation detector, several groups of load marking resistors and a voltage detector, the insulation detector is respectively connected to the positive and negative poles of the high-voltage battery pack and the insulating shell, and is used to monitor the insulation resistance and leakage current of the positive and negative poles of the high-voltage battery pack to the insulating shell; several groups of load marking resistors are respectively connected to the positive and negative poles of multiple loads, and the resistance values ​​of several groups of load marking resistors are different; the voltage detector is used to monitor the voltage on several groups of load marking resistors.

[0052] In the present embodiment, specifically, the calculation module calculates and determines the specific location of the insulation fault according to the magnitude of the leakage current monitored by the insulation detector and the voltage on the load marking resistor monitored by the voltage detector. It should be noted that, in the loop formed by the high-voltage battery pack and multiple groups of loads, the detection module uses multiple groups of load marking resistors to be respectively connected to the positive and negative poles of multiple loads, and determines whether there is an insulation fault at the load by referring to the load marking resistor method. That is, when an insulation fault occurs at the load, a certain potential difference will be formed at the positive and negative ends of the load due to the leakage current. The potential difference and the magnitude of the leakage current are monitored. The calculation module can calculate the correlation between the leakage current, the potential difference and whether there is an insulation fault, thereby further realizing the insulation detection of the loop formed by the high-voltage battery pack and multiple groups of loads.

[0053] Figure 1 FIG. 1 is a schematic diagram showing the principle of a high-voltage battery insulation detection system and method according to the present invention. Figure 1 As shown, in this embodiment, the load has Group, load marking resistor total Group, The load marking resistor is connected to the Group load, The set of load marking resistors includes:

[0054] Load Marking Resistor , connected in The positive pole of the group load, Indicates The first load connected to the Group load marking resistor ;

[0055] Load Marking Resistor , connected in The negative pole of the group load, Indicates The first load connected to the Group load marking resistor ;

[0056] Among them Load marking resistor in the group load marking resistor and load marking resistor The resistance value is the same. It should be noted that In a group of load marking resistors, the resistance value of each group is different. In each group of load marking resistors, the load marking resistors with the same resistance value and load marking resistor .

[0057] Figure 2 FIG. 1 is a schematic diagram showing the principle of a high-voltage battery insulation detection system and method according to the present invention. Figure 2 As shown, in this embodiment, the insulation detector is connected to the positive and negative electrodes of the high-voltage battery pack and the insulating shell respectively, and monitoring the insulation resistance and leakage current of the positive and negative electrodes of the high-voltage battery pack to the insulating shell includes:

[0058] Positive insulation resistance ;

[0059] Negative insulation resistance ;

[0060] Leakage Current .

[0061] In this embodiment, specifically, the voltage on the load marking resistor monitored by the voltage detector includes:

[0062] Load Marking Resistor Voltage , expressed as Group load marking resistor The voltage on

[0063] Load Marking Resistor Voltage , expressed as Group load marking resistor The voltage on.

[0064] In this embodiment, specifically, the calculation module calculates and determines the specific location where the insulation fault occurs according to the magnitude of the leakage current monitored by the insulation detector and the voltage on the load marking resistor monitored by the voltage detector, specifically including:

[0065] In case of insulation fault:

[0066] The calculation module collects the load marker resistor voltage monitored by the voltage detector and load marker resistor voltage ,calculate:

[0067] ;

[0068] The calculation module collects the leakage current monitored by the insulation detector ,judge:

[0069] like , then There is an insulation fault in the group load.

[0070] On the other hand, this embodiment further provides a high-voltage battery insulation detection method, including the high-voltage battery insulation detection system as described above, specifically including the following contents:

[0071] S1. Insulation detection:

[0072] The insulation tester is used to monitor the insulation resistance of the positive and negative electrodes of the high-voltage battery pack to the insulating shell, including the positive electrode insulation resistance. And negative insulation resistance , the positive insulation resistance to be monitored Insulation resistance qualified value For comparison:

[0073] when , that is, no insulation fault occurs;

[0074] when , that is, insulation failure occurs;

[0075] In the formula It is expressed as the qualified value of insulation resistance, that is, the minimum value of insulation resistance allowed when no insulation fault occurs;

[0076] S2. Insulation fault location:

[0077] when , that is, when insulation fault occurs:

[0078] The voltage detector monitors the Group load marking resistor voltage, where Set the load mark resistor voltage to the load mark resistor voltage and load marker resistor voltage ,calculate:

[0079] ;

[0080] Collect leakage current monitored by insulation detector when insulation fault occurs ,judge:

[0081] like , then in Insulation fault occurs at the group load. It should be noted that It is expressed as the calculation of the potential difference between the positive and negative ends of the load, and the result is expressed as current loss. When the calculated current loss is large and greater than the leakage current hour, , and the leakage current at this time Indicates the leakage current monitored when an insulation fault occurs. It can be further determined that there is an insulation fault in the load circuit and the current loss generated is greater than the leakage current detected. ;

[0082] S3, insulation fault warning:

[0083] when , that is, when there is no insulation fault:

[0084] Monitoring leakage current range,

[0085] , where It is expressed as the minimum value of the leakage current monitored when no insulation fault occurs. It is expressed as the maximum value of the leakage current monitored when no insulation fault occurs; it is calculated as:

[0086] ;

[0087] That is, by monitoring the load marker resistor voltage and load marker resistor voltage Insulation fault warning is carried out. In In the interval, there is no risk of insulation failure, that is, the current loss caused by the potential difference between the positive and negative ends of the load is normal loss. Beyond When the voltage is within the range, there is a risk of insulation failure, that is, a large leakage current may occur due to insulation failure.

[0088] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-voltage battery insulation detection system, comprising a high-voltage battery pack and a plurality of loads connected thereto, characterized in that: It also includes a detection module and a calculation module, wherein the detection module includes: An insulation tester, connected to the positive and negative electrodes of the high-voltage battery pack and the insulating shell, respectively, to monitor the insulation resistance and leakage current of the positive and negative electrodes of the high-voltage battery pack to the insulating shell; A plurality of groups of load marking resistors are respectively connected to the positive and negative electrodes of the plurality of loads, and the resistance values ​​of the plurality of groups of load marking resistors are different; A voltage detector for monitoring the voltages on a plurality of groups of load marking resistors; The calculation module calculates and determines the specific location where the insulation fault occurs according to the magnitude of the leakage current monitored by the insulation detector and the voltage on the load marking resistor monitored by the voltage detector.

2. The high-voltage battery insulation detection system according to claim 1, characterized in that: The load has The load marking resistors are Group, The load marking resistor is connected to the Group load, The load marking resistors of the group include: Load Marking Resistor , connected in The positive pole of the group load, Indicates The first load connected to the Group load marking resistor ; Load Marking Resistor , connected in The negative pole of the group load, Indicates The first load connected to the Group load marking resistor ; Among them The load marking resistor in the load marking resistor group and load marking resistor The resistance value is the same.

3. The high-voltage battery insulation detection system according to claim 2, characterized in that: The insulation detector is connected to the positive and negative electrodes of the high-voltage battery pack and the insulating shell respectively, and monitoring the insulation resistance and leakage current of the positive and negative electrodes of the high-voltage battery pack to the insulating shell includes: Positive insulation resistance ; Negative insulation resistance ; Leakage Current .

4. The high-voltage battery insulation detection system according to claim 3, characterized in that: The voltage on the load marking resistor monitored by the voltage detector includes: Load Marking Resistor Voltage , expressed as Group load marking resistor The voltage on Load Marking Resistor Voltage , expressed as Group load marking resistor The voltage on.

5. The high-voltage battery insulation detection system according to claim 4, characterized in that: The calculation module calculates and determines the specific location of the insulation fault according to the leakage current monitored by the insulation detector and the voltage on the load marking resistor monitored by the voltage detector, specifically including: In case of insulation fault: The calculation module collects the load marker resistor voltage monitored by the voltage detector and load marker resistor voltage ,calculate: ； The calculation module collects the leakage current monitored by the insulation detector ,judge: like , then There is an insulation fault in the group load.

6. A high voltage battery insulation detection method, characterized in that: The high-voltage battery insulation detection system according to any one of claims 1 to 5 specifically includes the following contents: S1. Insulation detection: The insulation resistance of the positive and negative electrodes of the high-voltage battery pack to the insulating shell is monitored by an insulation tester, including the insulation resistance of the positive electrode. And negative insulation resistance , the positive insulation resistance to be monitored Insulation resistance qualified value For comparison: when , that is, no insulation fault occurs; when , that is, insulation failure occurs; In the formula It is expressed as the qualified value of insulation resistance, that is, the minimum value of insulation resistance allowed when no insulation fault occurs; S2. Insulation fault location: when , that is, when insulation fault occurs: The voltage detector monitors the Group load marking resistor voltage, where Set the load mark resistor voltage to the load mark resistor voltage and load marker resistor voltage ,calculate: ； Collect leakage current monitored by insulation detector when insulation fault occurs ,judge: like , then in Insulation fault occurs at the group load; S3, insulation fault warning: when , that is, when there is no insulation fault: Monitoring leakage current range, , where It is expressed as the minimum value of the leakage current monitored when no insulation fault occurs. It is expressed as the maximum value of the leakage current monitored when no insulation fault occurs; The calculation results are: ; That is, by monitoring the load marker resistor voltage and load marker resistor voltage Insulation fault warning is carried out. In There is no risk of insulation failure in the interval. Beyond There is a risk of insulation failure when the

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