WO2020113413A1 - Procédé et système de test d'isolation de bloc-batterie, dispositif électronique et support de stockage - Google Patents

Procédé et système de test d'isolation de bloc-batterie, dispositif électronique et support de stockage Download PDF

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Publication number
WO2020113413A1
WO2020113413A1 PCT/CN2018/119133 CN2018119133W WO2020113413A1 WO 2020113413 A1 WO2020113413 A1 WO 2020113413A1 CN 2018119133 W CN2018119133 W CN 2018119133W WO 2020113413 A1 WO2020113413 A1 WO 2020113413A1
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Prior art keywords
resistance
insulation
battery pack
insulation resistance
detection
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PCT/CN2018/119133
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English (en)
Chinese (zh)
Inventor
张艳辉
冯伟
张晨宁
冯亚春
尹铎
刘笑
Original Assignee
深圳先进技术研究院
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Priority to PCT/CN2018/119133 priority Critical patent/WO2020113413A1/fr
Publication of WO2020113413A1 publication Critical patent/WO2020113413A1/fr

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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]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables

Definitions

  • the invention relates to the technical field of battery pack insulation detection, in particular to a battery pack insulation detection method, system, electronic device and storage medium.
  • hybrid electric vehicles and electric vehicles are gradually occupying the domestic automotive market, and the power source of hybrid electric vehicles and electric vehicles is the on-board battery system.
  • the voltage of the on-board battery system is as high as 200V to 600V, and the current will reach several hundred amperes.
  • the battery pack of the onboard battery system will generate leakage current when it starts or works.
  • the safe voltage that the human body can withstand depends on the current allowed by the human body and the resistance of the human body, in the case of an electric shock protection device, the human body allows The passing current is 30mA, and the withstand voltage is about 60V. When the DC voltage exceeds 60V, it will cause electric shock damage to the human body. Therefore, the on-board battery systems in hybrid vehicles and electric locomotives have insulation designs. If the leakage current is controlled within a safe range, it is necessary to strictly check the insulation value of the above insulation design to ensure the normal operation of electrical equipment, safe operation of vehicles and personal safety of passengers.
  • the balanced bridge method has high requirements for the accuracy of the circuit construction, and it cannot be accurately detected when the insulation performance of the positive and negative electrodes is reduced simultaneously;
  • the unbalanced bridge method uses circuit voltage In principle, by measuring the voltage of the voltage divider resistance, the insulation resistance value is obtained by listing the equations. However, during the operation of the vehicle, the voltage at both ends of the battery pack changes greatly, which affects the calculation accuracy. In the insulation resistance measurement process, there are The stronger signal disturbance has a greater impact on the calculation results, and it is not suitable for the frequent start and stop of electric vehicles in urban traffic congestion.
  • the detection method in the prior art cannot increase the accuracy of detection on the basis of reducing costs, resulting in inaccurate detection results or higher detection costs.
  • a first aspect of the present invention provides a battery pack insulation detection method, including: establishing an insulation impedance detection model between a battery pack and a vehicle chassis; detecting the insulation resistance set by the battery pack, and obtaining the insulation performance of the insulation resistance; Simplify the detection model according to the insulation performance, and derive a battery insulation insulation resistance model that takes into account multiple parameters such as battery temperature; calculate an insulation resistance estimate of the insulation resistance based on the detection model and the detection resistance model value.
  • the invention is established by establishing and simplifying the internal resistance model of insulation detection, not only can the insulation performance of the insulation resistance outside the battery pack be obtained, but also the internal resistance of the battery pack can be added to the calculation as an influencing factor, thereby improving the detection accuracy, and the invention is established by establishing The model can fully simulate the current change caused by various reasons such as transient voltage change and linear change of the battery pack without additional hardware, thereby reducing the cost of detection.
  • FIG. 1 is a schematic structural block diagram of a battery pack insulation detection method according to an embodiment of the present invention
  • FIG. 2 is a circuit diagram of an insulation resistance detection model between a battery pack and a chassis of an embodiment of the present invention
  • FIG. 3 is an internal resistance model of battery pack insulation detection according to an embodiment of the present invention.
  • FIG. 4 is a schematic block diagram of a structure of a battery pack insulation detection system according to an embodiment of the invention.
  • FIG. 5 is a schematic block diagram of a structure of a detection model building module of a battery pack insulation detection system according to an embodiment of the present invention
  • FIG. 6 is a schematic block diagram of a structure of an insulation resistance calculation module of a battery pack insulation detection system according to an embodiment of the present invention
  • FIG. 7 is a schematic block diagram of a structure of an electronic device according to an embodiment of the invention.
  • a first aspect of the present invention provides a battery pack insulation detection method, including: establishing an insulation impedance detection model between a battery pack and a vehicle chassis; detecting the insulation resistance set by the battery pack, and obtaining the insulation performance of the insulation resistance; Simplify the detection model according to the insulation performance, and derive a battery insulation insulation resistance model that takes into account multiple parameters such as battery temperature; calculate an insulation resistance estimate of the insulation resistance based on the detection model and the detection resistance model value.
  • the method further includes: establishing an insulation resistance detection model between the battery pack and the vehicle chassis; the establishing an insulation resistance detection model between the battery pack and the vehicle chassis includes : At least two power supplies connected in series are formed to form a battery pack; a first resistor is provided between the electrodes of the power supplies coupled to each other, and the adjacent first resistors are connected in parallel to form a resistor set, and the power of the battery pack A second resistor connected in series with the resistance group is provided between the stages; a reference resistance for connecting the two stages of the battery group is provided on the two stages of the battery group; a method is provided between the resistance group and the reference resistance A wave generator; a precision sampling resistor is provided between the square wave generator and the reference resistor; the insulation resistance to the battery pack, the voltage of the power supply, the internal resistance of the power supply, the insulation resistance, The reference resistor, the output voltage of the square wave generator, and the precision resistor assignment.
  • calculating the estimated value of the insulation resistance of the resistor includes: according to Kirchhoff's current law, solving the first current at the coupling of the negative pole of the battery pack and the insulation resistance close to the negative pole of the battery pack; Hu's current law solves the second current at the junction of the precision resistance and the reference resistance; calculates the estimated value of the insulation resistance according to the insulation resistance of the battery pack, the first current, and the second current.
  • the detection method further includes: insulation resistance of the battery pack, voltage of the power supply, internal resistance of the power supply, insulation resistance, the reference resistance, and output of the square wave generator
  • the voltage and the precision resistance are assigned at least twice, and the insulation resistance estimate value for each assignment is calculated, and the insulation resistance estimate value calculated for each assignment is used as a binary data set; Credibility definition; according to the credibility definition and the binary data set, calculate the most reliable insulation impedance estimate, and use the highest credibility insulation impedance estimate to verify the
  • the detection internal resistance model calculates the estimated value of the insulation resistance of the resistance.
  • a second aspect of the present invention provides a battery pack insulation detection system, including: a detection module for detecting the insulation resistance set by the battery pack and obtaining the insulation performance of the insulation resistance; an internal resistance model building module for The insulation performance simplifies the insulation resistance detection model between the battery pack and the vehicle chassis, and draws a battery pack insulation resistance internal resistance model that takes into account multiple parameters such as battery temperature; an insulation resistance calculation module is used to calculate the insulation resistance according to the detection model and the detection The internal resistance model calculates the estimated value of the insulation resistance of the insulation resistance.
  • the system further includes: a detection model building module for establishing an insulation resistance detection model between the battery pack and the vehicle chassis before the detection module detects the insulation resistance set by the battery pack;
  • the detection model building module includes : A battery unit for forming a battery using at least two power supplies connected in series; a resistance setting unit for setting a first resistance between electrodes of the power supply coupled to each other A resistor is connected in parallel to form a resistor group, and a second resistor connected in series with the resistor group is provided between the electric levels of the battery group; a reference resistor unit is used to set the two stages of the battery group to connect the two battery groups.
  • Level reference resistor square wave generator unit for setting a square wave generator between the resistance group and the reference resistor; sampling resistance setting unit for setting the square wave generator and the reference resistor A precision sampling resistor is set between; an assignment unit is used for the insulation resistance of the battery pack, the voltage of the power supply, the internal resistance of the power supply, the insulation resistance, the reference resistance, the square wave generator Output voltage and the precision resistor assignment.
  • the insulation impedance calculation module includes: a first current calculation unit for solving the first current at the coupling point of the insulation resistance of the negative electrode of the battery pack and the negative electrode of the battery pack according to Kirchhoff's current law ; A second current calculation unit for solving the second current at the coupling point of the precision resistor and the reference resistor according to Kirchhoff’s current law; an estimated value calculation unit for calculating the insulation resistance of the battery pack according to the The first current and the second current calculate the estimated value of the insulation resistance.
  • the system further includes: a repeated assignment module for insulating resistance of the battery pack, voltage of the power supply, internal resistance of the power supply, the insulation resistance, the reference resistance, the square
  • the output voltage of the wave generator and the precision resistance are assigned at least twice, and the insulation resistance estimate value for each assignment is calculated, and the insulation resistance estimate value calculated for each assignment is used as a binary data set; reliability A definition module, used to define the reliability of the estimated value of the insulation impedance; an estimated value verification module, used to calculate the estimated value of the insulation impedance with the highest reliability according to the definition of the reliability and the binary data set, The insulation resistance estimated value with the highest reliability is used to verify that the insulation resistance estimated value of the resistance is calculated according to the detection model and the detected internal resistance model.
  • a third aspect of the present invention provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor.
  • the processor executes the computer program, the foregoing Any one of the methods.
  • a fourth aspect of the present invention provides a computer-readable storage medium on which a computer program is stored, characterized in that when the computer program is executed by a processor, any one of the methods described above is implemented.
  • FIG. 1 for a battery pack insulation detection method, including: S1, detecting the insulation resistance set by the battery pack, and obtaining the insulation performance of the insulation resistance; S2, simplifying the insulation resistance between the battery pack and the vehicle chassis according to the insulation performance Test the model, and get the insulation resistance model of the battery pack insulation considering the multi-parameters of the battery temperature; S3. Calculate the insulation resistance estimation value of the insulation resistance according to the detection model and the detection resistance model.
  • the detection method further includes: establishing an insulation impedance detection model between the battery pack and the vehicle chassis; establishing an insulation impedance detection model between the battery pack and the vehicle chassis includes: Establish an insulation resistance detection model between the battery pack and the chassis of the vehicle, and in this embodiment, only one detection model needs to be established, with r i representing the internal resistance of the battery in the battery pack, and E i representing the internal resistance of the battery pack
  • R i represents the first resistance, that is, the insulation resistance of each battery in the battery pack relative to the chassis of the vehicle, where, in r i and E i , i is a non-zero positive integer and the maximum value of i Is the number of batteries in the battery pack; in R i , i is a non-zero positive integer, and the maximum value of i is the number of batteries in the battery pack minus one; I is the bus current of the battery pack; R i and E i , i is a non-zero positive integer, and the maximum value of i is the
  • Establishing the detection model includes: setting at least two series connected The power supply forms a battery pack; a first resistor is provided between the electrodes where the power supplies are coupled to each other, and the adjacent first resistors are connected in parallel to form a resistor set, and a second in series with the resistor set is provided between the electric levels of the battery pack Resistance; set the reference resistance for connecting the two levels of the battery pack on the two levels of the battery pack; set the square wave generator between the resistance set and the reference resistor; set the precision sampling resistance between the square wave generator and the reference resistance; Assign the insulation resistance of the battery pack, the voltage of the power supply, the internal resistance of the power supply, the insulation resistance, the reference resistance, the output voltage of the square wave generator and the precision resistance.
  • Calculating the estimated value of the insulation resistance of the insulation resistance includes: solving the first current at the junction of the battery pack negative pole and the insulation resistance close to the battery pack negative pole according to Kirchhoff’s current law; solving the precision resistance and reference according to Kirchhoff’s current law The second current where the resistors are coupled; calculate the insulation resistance estimate based on the insulation resistance of the battery pack, the first current, and the second current
  • the coupling point between the negative electrode of the battery pack and the insulation resistance near the negative electrode of the battery pack is marked as A, and the voltage at A is set to V A ; the coupling place of the precision resistance and the reference resistance is marked as B; then using Kirchhoff's current law at B can get formula (2), which is as follows: Applying Kirchhoff's current law to point B can obtain formula (3), which is expressed as follows: Formula (4) can be derived from formula (1), formula (2) and formula (3), and formula (4) is expressed as follows:
  • ⁇ V f (k, k+m) V f (k)-V f (k+m)
  • ⁇ V s (k, k+m) V s (k)-V s (k+m).
  • the detection method also includes: at least two assignments to the insulation resistance of the battery pack, the voltage of the power supply, the internal resistance of the power supply, the insulation resistance, the reference resistance, the output voltage of the square wave generator and the precision resistance, and calculate the insulation resistance of each assignment Estimated value, and use the estimated value of insulation resistance calculated in each assignment as a binary data set; define the reliability of the estimated value of insulation resistance; calculate the insulation resistance with the highest reliability according to the definition of reliability and the binary data set Estimated value, and verify the insulation resistance estimated value of the calculated resistance according to the detection model and the detected internal resistance model with the highest reliability insulation resistance estimation value.
  • the definition of the reliability of the estimated value of the insulation impedance includes: determining the error of the estimated value of the insulation impedance during the design of the battery pack; determining the principle of division of the confidence interval and the method of dividing the confidence interval; setting the voltage of the square wave generator, and Record the stable detection voltage value, and save the detection data set; divide the confidence interval according to the division of the confidence interval and calculate the reliability of the insulation impedance corresponding to the data in the binary data set; according to the highest insulation Impedance credibility calculates the estimated value of the insulation resistance of the battery pack.
  • R sys /R p ⁇ 1 Insulation impedance estimation error during battery system design and production satisfies ⁇ R sys /R sys ⁇ , then R sys /R p ⁇ 1 can be derived from formula (6), which is expressed as follows:
  • the division principle of the confidence interval includes: covering more than half of the measured binary data set; satisfying the reliability of the binary data set that determines the error of the estimated value of the insulation resistance when designing the battery pack The degree is 1; the calculation process is simple.
  • the confidence interval is divided as follows: define formula (7), and formula (7) is expressed as follows: Then the formula (8) of the division method can be obtained.
  • the formula (8) is expressed as follows:
  • a 1 (k,m) ⁇ V TH(k,m) ;
  • N set the output voltage of the k-th step of the square wave generator to (-1) k V fm ; define the insulation resistance of the K-1 step as R sys(k-1) , and store the first 2M steps
  • the measured data, the reliability of the insulation impedance calculated by the data set composed of the k-th step and the k-1, k-3,..., k-2M+1 step measurement data are ⁇ 0 , ⁇ 1 ,... , ⁇ M-1 , ⁇ i ⁇ (a 0 , a 1 , ..., a N-1 ), where the maximum confidence is defined as ⁇ max (k), then the estimated insulation resistance corresponding to the maximum confidence for Then, the estimated value of the insulation resistance in step k is defined as formula (9), which is expressed as follows: From the above analysis, it can be seen that the selected ⁇ , R s , R r and T can achieve the reliability algorithm of insulation resistance detection.
  • a battery pack insulation detection system includes: a detection module for detecting the insulation resistance set by the battery pack and obtaining the insulation performance of the insulation resistance.
  • the internal resistance model building module is used to simplify the insulation resistance detection model between the battery pack and the chassis according to the insulation performance, and to obtain the battery pack insulation detection internal resistance considering multiple parameters such as battery temperature Model; Insulation resistance calculation module, used to calculate the insulation resistance estimated value of insulation resistance according to the detection model and the detection internal resistance model.
  • the battery pack insulation detection system further includes: a detection model building module, which is used to establish an insulation resistance detection model between the battery pack and the vehicle chassis before the detection module detects the insulation resistance set by the battery pack;
  • the building module includes: a battery pack unit for forming a battery pack using at least two power supplies connected in series; a resistance setting unit for setting a first resistance between electrodes of which the power supplies are coupled to each other and making the adjacent first The resistors are connected in parallel to form a resistor group, and a second resistor connected in series with the resistor group is provided between the levels of the battery pack.
  • two second resistors are provided, and the resistor group is located between the two second resistors ;
  • Reference resistance unit used to set the reference resistance used to connect the two levels of the battery pack at two levels of the battery pack; square wave generator unit, used to set the square wave generator between the resistance set and the reference resistor; sampling resistance The setting unit is used to set a precision sampling resistor between the square wave generator and the reference resistance;
  • the assignment unit is used to insulate the battery pack's insulation resistance, power supply voltage, power supply's internal resistance, insulation resistance, reference resistance, and square wave The output voltage and precision resistance of the device are assigned.
  • the insulation resistance detection model between the battery pack and the chassis is simplified by combining the internal resistance of the power supply and the residual power supply, and merging the first resistance into the second resistance.
  • the insulation impedance calculation module includes: a first current calculation unit for solving the first current at the coupling point of the insulation resistance of the battery pack negative electrode and the battery pack negative electrode according to Kirchhoff’s current law; the second current The calculation unit is used to solve the second current at the junction of the precision resistance and the reference resistance according to Kirchhoff's current law; the estimated value calculation unit is used to calculate the insulation based on the insulation resistance, the first current and the second current of the battery pack Estimated impedance.
  • the system also includes: a repeated assignment module, which is used to assign at least twice the insulation resistance of the battery pack, the voltage of the power supply, the internal resistance of the power supply, the insulation resistance, the reference resistance, the output voltage of the square wave generator and the precision resistance, and calculate each Estimated insulation impedance value of the second assignment, and use the estimated insulation impedance value calculated for each assignment as a binary data set; a reliability definition module for defining the reliability of the estimated insulation resistance value; an estimated value verification module, It is used to calculate the estimated insulation resistance value with the highest reliability according to the definition of reliability and the binary data set, and to verify the estimated insulation resistance value of the resistance calculated according to the detection model and the detection internal resistance model with the insulation reliability estimated value with the highest reliability.
  • a repeated assignment module which is used to assign at least twice the insulation resistance of the battery pack, the voltage of the power supply, the internal resistance of the power supply, the insulation resistance, the reference resistance, the output voltage of the square wave generator and the precision resistance, and calculate each Estimated insulation impedance value of the
  • the credibility definition module includes: an error estimation unit for determining the error of the insulation impedance estimation value during battery design; an interval division unit for determining the division principle of the confidence interval and the division method of the confidence interval; voltage setting The unit is used to set the voltage of the square wave generator, and record the stabilized detection voltage value, and save the detection data set; the insulation impedance credibility unit is used to divide the credibility interval according to the division of the credibility interval and Calculate the insulation impedance credibility corresponding to the data in the binary data set; the insulation impedance estimation value verification unit is used to calculate the insulation impedance estimation value of the battery pack according to the highest insulation impedance reliability.
  • An embodiment of the present application provides an electronic device. Please refer to 7.
  • the electronic device includes: a memory 601, a processor 602, and a computer program stored on the memory 601 and executable on the processor 602.
  • the processor 602 executes the computer program At this time, the battery pack insulation detection method described in the foregoing embodiments is implemented.
  • the electronic device further includes: at least one input device 603 and at least one output device 604.
  • the aforementioned memory 601, processor 602, input device 603, and output device 604 are connected via a bus 605.
  • the input device 603 may specifically be a camera, a touch panel, a physical button, a mouse, or the like.
  • the output device 604 may specifically be a display screen.
  • the memory 601 may be a high-speed random access memory (RAM, Random Access Memory) memory, or may be a non-volatile memory (non-volatile memory), such as a disk memory.
  • RAM Random Access Memory
  • non-volatile memory non-volatile memory
  • the memory 601 is used to store a set of executable program codes, and the processor 602 is coupled to the memory 601.
  • an embodiment of the present application further provides a computer-readable storage medium.
  • the computer-readable storage medium may be provided in the electronic device in each of the foregoing embodiments, and the computer-readable storage medium may be as shown in FIG. 7 described above.
  • the memory 601 in the embodiment is shown.
  • a computer program is stored on the computer-readable storage medium, and when the program is executed by the processor 602, the battery pack insulation detection method described in the foregoing method embodiments is implemented.
  • the computer storable medium may also be various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory 601 (ROM, Read-Only Memory), RAM, a magnetic disk, or an optical disk.
  • program codes such as a U disk, a mobile hard disk, a read-only memory 601 (ROM, Read-Only Memory), RAM, a magnetic disk, or an optical disk.

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Abstract

La présente invention concerne un procédé et un système de test d'isolation de bloc-batterie, un dispositif électronique et un support de stockage. Le procédé est utilisé pour tester la résistance d'isolation d'un bloc-batterie, et résout le problème de l'état de la technique selon lequel un test de résistance d'isolation est imprécis et coûteux. Le procédé comprend : le test d'une résistance d'isolation configurée d'un bloc-batterie, et l'acquisition de performances d'isolation de la résistance d'isolation (S1) ; la simplification d'un modèle de test de résistance d'isolation entre le bloc-batterie et un châssis de véhicule en fonction des performances d'isolation, et l'acquisition d'un modèle de résistance interne de test d'isolation de bloc-batterie en tenant compte de paramètres multiples tels que la température de batterie (S2) ; et le calcul d'une valeur de résistance d'isolation estimée de la résistance d'isolation conformément au modèle de test de résistance d'isolation et au modèle de résistance interne de test (S3). Par conséquent, l'invention améliore la précision de test, simule complètement, sans utiliser aucun matériel supplémentaire, un changement de courant causé par différents facteurs tels qu'un changement instantané ou un changement linéaire de la tension du bloc-batterie, et réduit les coûts de test.
PCT/CN2018/119133 2018-12-04 2018-12-04 Procédé et système de test d'isolation de bloc-batterie, dispositif électronique et support de stockage WO2020113413A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205176141U (zh) * 2015-11-07 2016-04-20 深圳市沃特玛电池有限公司 一种电动汽车电池绝缘检测系统
CN106997006A (zh) * 2017-04-20 2017-08-01 广州致远电子股份有限公司 一种基于h桥电阻的绝缘电阻测量电路的校准方法及装置
CN108333548A (zh) * 2017-12-30 2018-07-27 宁德时代新能源科技股份有限公司 绝缘电阻测量设备及故障自诊断方法
CN108802494A (zh) * 2017-05-03 2018-11-13 华为技术有限公司 绝缘电阻的检测电路、检测方法和装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205176141U (zh) * 2015-11-07 2016-04-20 深圳市沃特玛电池有限公司 一种电动汽车电池绝缘检测系统
CN106997006A (zh) * 2017-04-20 2017-08-01 广州致远电子股份有限公司 一种基于h桥电阻的绝缘电阻测量电路的校准方法及装置
CN108802494A (zh) * 2017-05-03 2018-11-13 华为技术有限公司 绝缘电阻的检测电路、检测方法和装置
CN108333548A (zh) * 2017-12-30 2018-07-27 宁德时代新能源科技股份有限公司 绝缘电阻测量设备及故障自诊断方法

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