CN110707386A - Battery pack, detection method and detection device for electric leakage position point of battery pack and vehicle - Google Patents
Battery pack, detection method and detection device for electric leakage position point of battery pack and vehicle Download PDFInfo
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- CN110707386A CN110707386A CN201911138897.3A CN201911138897A CN110707386A CN 110707386 A CN110707386 A CN 110707386A CN 201911138897 A CN201911138897 A CN 201911138897A CN 110707386 A CN110707386 A CN 110707386A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
Abstract
The invention relates to a battery pack, a detection method of a leakage position point of the battery pack, a detection device and a vehicle, wherein the battery pack is provided with a leakage detection circuit, the leakage detection circuit comprises a first voltage measurement unit and a second voltage measurement unit, a first end and a second end of the first voltage measurement unit are respectively connected with two ends of a positive electrode earth leakage resistor of the battery pack and are used for measuring voltages of two ends of the positive electrode earth leakage resistor, a second end and a third end of the first voltage measurement unit are respectively used for being connected with two ends of a first voltmeter, a first end and a second end of the second voltage measurement unit are connected with two ends of a negative electrode earth leakage resistor of the battery pack and are used for measuring voltages of two ends of the negative electrode earth leakage resistor, a second end and a third end of the second voltage measurement unit are respectively used for being connected with two ends of a second voltmeter, and a second end of the first voltage measurement unit and a second end of the second voltage measurement unit are both connected with a common grounding end, the leakage position point can be quickly detected.
Description
Technical Field
The invention relates to the field of electrical detection, in particular to a battery pack, a detection method and a detection device for a leakage position point of the battery pack and a vehicle.
Background
With the increasing popularization of electric vehicles, people pay more and more attention to the safety of electric vehicles. The battery pack is the heart of the electric automobile, the voltage of the battery pack is generally over hundreds of volts, insulation faults of the battery pack occur, and the monitoring of the insulation faults and the judgment of the leakage position when the insulation faults occur are very important. The existing battery pack insulation detection generally adopts a scheme of GB/T18384.1 parallel resistors, but the specific accurate position of insulation fault in the battery pack cannot be further judged after the insulation problem is detected by adopting the method, and only manual unpacking is adopted to manually check high-voltage devices and each battery in the battery pack one by one. This obviously wastes time and effort on the part of maintenance personnel and presents a high safety risk.
Disclosure of Invention
In view of the above, the invention provides a battery pack, a detection method and a detection device for a leakage position point of the battery pack, and a vehicle, which can realize detection of voltages at two ends of a negative electrode to ground leakage resistor and voltages at two ends of a positive electrode leakage resistor by arranging a leakage detection circuit, and further judge the leakage position point when leakage occurs in the battery pack, thereby greatly facilitating maintenance work of maintenance personnel, and simultaneously reducing safety risks when the maintenance personnel maintain.
A battery pack is formed by connecting multiple stages of batteries in series and is provided with an electric leakage detection circuit, wherein the electric leakage detection circuit comprises a first voltage measurement unit and a second voltage measurement unit, a first end and a second end of the first voltage measurement unit are respectively connected with two ends of a positive electrode earth leakage resistor of the battery pack and are used for measuring voltages at two ends of the positive electrode earth leakage resistor, and a second end and a third end of the first voltage measurement unit are respectively used for being connected with two ends of a first voltmeter;
the first end and the second end of the second voltage measuring unit are connected with two ends of a negative electrode earth leakage resistor of the battery pack and used for measuring voltages of two ends of the negative electrode earth leakage resistor, the second end and the third end of the second voltage measuring unit are respectively used for being connected with two ends of a second voltmeter, and the second end of the first voltage measuring unit and the second end of the second voltage measuring unit are both connected with a common grounding end.
In one embodiment, the first voltage measuring unit comprises a first voltage dividing resistor, a second voltage dividing resistor and a first switching unit which are connected in series, two ends of the second voltage dividing resistor are connected with the first voltmeter, and the second voltage dividing resistor is larger than the first voltage dividing resistor; the second voltage measuring unit comprises a third voltage dividing resistor, a fourth voltage dividing resistor and a second switch unit which are connected in series, two ends of the fourth voltage dividing resistor are connected with the second voltmeter, and the third voltage dividing resistor is larger than the fourth voltage dividing resistor.
A detection method of a battery pack leakage position point is applied to the battery pack, and comprises the following steps:
respectively calculating the magnitude of the positive electrode earth leakage resistance and the magnitude of the negative electrode earth leakage resistance;
judging whether the battery pack leaks electricity or not according to a preset standard leakage resistance value, the size of the anode-to-ground leakage resistance and the size of the cathode-to-ground leakage resistance;
when the electric leakage of the battery pack is judged, acquiring the voltage to ground of the anode and the voltage to ground of the cathode of the battery pack;
and calculating to obtain a battery pack leakage position point according to the voltage to ground of the anode and the voltage to ground of the cathode.
In one embodiment, the detection method is applied to the battery pack, and the step of calculating the magnitude of the positive-electrode earth leakage resistance and the magnitude of the negative-electrode earth leakage resistance of the battery pack respectively comprises the following steps:
when the first switch unit is closed and the second switch unit is opened, the first voltage measuring unit is used for acquiring the voltage to ground of the first anode of the battery pack, and a first corresponding relation between the anode-to-ground leakage resistor and the cathode-to-ground leakage resistor is established according to the voltage to ground of the first anode, the total voltage of the battery pack, the size of the first divider resistor and the size of the second divider resistor;
when the first switch unit is switched off and the second switch unit is switched on, the second voltage measuring unit is used for acquiring the first negative voltage-to-ground voltage of the battery pack, and a second corresponding relation between the positive electrode earth leakage resistor and the negative electrode earth leakage resistor is established according to the first negative voltage-to-ground voltage, the total voltage of the battery pack, the size of the third voltage dividing resistor and the size of the fourth voltage dividing resistor;
when the first switch unit and the second switch unit are closed, a second anode-to-ground voltage of the battery pack is obtained through the first voltage measuring unit, a second cathode-to-ground voltage of the battery pack is obtained through the second voltage measuring unit, and a third corresponding relation between the anode-to-ground leakage resistor and the cathode-to-ground leakage resistor is established according to the second anode-to-ground voltage, the second cathode-to-ground voltage, the size of the first divider resistor, the size of the second divider resistor, the size of the third divider resistor and the size of the fourth divider resistor;
and calculating the magnitude of the positive electrode earth leakage resistance and the magnitude of the negative electrode earth leakage resistance according to any two corresponding relations of the first corresponding relation, the second corresponding relation and the third corresponding relation.
In one embodiment, the first corresponding relationship, the second corresponding relationship and the third corresponding relationship respectively correspond to the following formulas:
wherein, formula (1) represents the first corresponding relation, formula (2) represents the second corresponding relation, formula (3) represents the third corresponding relation, Rn// (R)1+R2) Represents Rn and (R)1+R2) Total resistance after parallel connection, Rp// (R)3+R4) Represents Rp and (R)3+R4) Total resistance after parallel connection, Un1Representing a first positive voltage to ground, Up1Representing the first negative voltage to ground, Un2Representing the second anode voltage to ground, Up2Representing the second negative voltage to ground, U representing the total voltage of the battery pack, R1Denotes a first divider resistance, R2Denotes a second divider resistance, R3Denotes a third voltage dividing resistance, R4The fourth voltage-dividing resistor is shown, Rn is the leakage resistance of the positive electrode to the ground, and Rp is the leakage resistance of the negative electrode to the ground.
In one embodiment, the first voltage-dividing resistor is larger than the second voltage-dividing resistor, and the step of acquiring the voltage-to-ground of the first positive electrode of the battery pack by the first voltage measuring unit includes:
and measuring and acquiring a voltage division value of the second voltage division resistor, and calculating to obtain the voltage to ground of the first anode of the battery pack by combining the size of the first voltage division resistor and the size of the second voltage division resistor.
In one embodiment, the third voltage dividing resistor is larger than the fourth voltage dividing resistor, and the step of obtaining the voltage to ground of the first negative electrode of the battery pack through the second voltage measuring unit includes:
and measuring and obtaining a voltage division value of the fourth voltage division resistor, and calculating to obtain the voltage to ground of the first cathode of the battery pack by combining the size of the third voltage division resistor and the size of the fourth voltage division resistor.
In one embodiment, the calculation formula of the leakage location point of the battery pack is calculated according to the voltage to ground of the positive electrode, the voltage to ground of the negative electrode and the total voltage of the battery pack as follows:
wherein, U in the formula (4)nRepresents the positive electrode voltage to ground, UpRepresenting the voltage of the cathode to ground, k1Represents the position proportion, k, of the leakage battery in the battery pack when the positive electrode of the battery pack is taken as a starting point2The position ratio of the leakage battery in the battery pack when the negative electrode of the battery pack is taken as a starting point is shown.
In addition, still provide a detection device of battery package electric leakage position point, be applied to above-mentioned battery package, detection device includes:
the resistance calculation unit is used for respectively calculating the magnitude of the positive electrode earth leakage resistance and the magnitude of the negative electrode earth leakage resistance;
the leakage judging unit is used for judging whether the battery pack leaks electricity or not according to a preset standard leakage resistance value, the size of the anode-to-ground leakage resistance and the size of the cathode-to-ground leakage resistance;
the voltage acquisition unit is used for acquiring the voltage to earth of the positive electrode and the voltage to earth of the negative electrode of the battery pack when the electric leakage of the battery pack is judged;
and the leakage position point determining unit is used for calculating a battery pack leakage position point according to the anode-to-ground voltage and the cathode-to-ground voltage.
In addition, still provide a vehicle, set up above-mentioned battery package.
A readable storage medium, which stores a computer program that, when executed by a processor, implements the detection method described above.
The battery pack is provided with the leakage detection circuit, the leakage detection circuit comprises a first voltage measurement unit and a second voltage measurement unit, a first end and a second end of the first voltage measurement unit are respectively connected with two ends of a positive electrode earth leakage resistor of the battery pack and are used for measuring voltages at two ends of the positive electrode earth leakage resistor, a second end and a third end of the first voltage measurement unit are respectively used for being connected with two ends of a first voltmeter, a first end and a second end of the second voltage measurement unit are connected with two ends of a negative electrode earth leakage resistor of the battery pack and are used for measuring voltages at two ends of the negative electrode earth leakage resistor, a second end and a third end of the second voltage measurement unit are respectively used for being connected with two ends of a second voltmeter, a second end of the first voltage measurement unit and a second end of the second voltage measurement unit are both connected with the public ground, and can realize the detection of the voltages at two ends of the negative electrode earth leakage resistor and the voltages at two ends of the positive electrode earth leakage resistor, and then when taking place the electric leakage in the battery package, judge the electric leakage position point according to negative pole to earth leakage resistance both ends voltage and anodal leakage resistance both ends voltage, very big maintenance work that has made things convenient for maintenance personal has also reduced the safe risk when maintenance personal maintains simultaneously.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
Fig. 1 is a circuit configuration diagram of a leakage detecting circuit provided in a battery pack according to an embodiment;
fig. 2 is a schematic flowchart illustrating a method for detecting a leakage location point of a battery pack according to an embodiment;
FIG. 3 is a schematic flow chart illustrating a method for calculating magnitudes of the positive leakage resistance to ground and the negative leakage resistance to ground in one embodiment;
fig. 4 is a block diagram of a structure corresponding to a device for detecting a location of a battery pack leakage according to an embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Various embodiments of the present disclosure will be described more fully hereinafter. The present disclosure is capable of various embodiments and of modifications and variations therein. However, it should be understood that: there is no intention to limit the various embodiments of the disclosure to the specific embodiments disclosed herein, but rather, the disclosure is to cover all modifications, equivalents, and/or alternatives falling within the spirit and scope of the various embodiments of the disclosure.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
As shown in fig. 1, a battery pack 100 is provided, the battery pack 100 is provided with a leakage detection circuit 200, the leakage detection circuit 200 includes a first voltage measurement unit 210 and a second voltage measurement unit 220, a first end and a second end of the first voltage measurement unit 210 are respectively connected to two ends of a positive electrode-to-ground leakage resistor Rn of the battery pack 100 and are used for measuring voltages at the two ends of the positive electrode-to-ground leakage resistor Rn, and a second end and a third end of the first voltage measurement unit 210 are respectively used for being connected to two ends of a first voltmeter V1;
the first end and the second end of the second voltage measuring unit 220 are connected to two ends of the negative earth leakage resistor Rp of the battery pack 100, and are used for measuring the voltage across the negative earth leakage resistor Rp, the second end and the third end of the second voltage measuring unit 220 are respectively used for being connected to two ends of the second voltmeter V2, and the second end of the first voltage measuring unit 210 and the second end of the second voltage measuring unit 220 are both connected to the common ground terminal 230.
The positive electrode of the battery pack 100 is connected to one end of the positive earth leakage resistor Rn, and the negative electrode of the battery pack 100 is connected to one end of the negative earth leakage resistor Rn.
When the leakage detection circuit 200 works, firstly, the voltage across the positive electrode leakage resistance Rn to the ground is calculated through the reading of the first voltmeter V1, the voltage across the negative electrode leakage resistance Rp is calculated through the reading of the second voltmeter V2, when the battery pack 100 leaks electricity, the leakage position point of the battery pack 100 is equivalent to short circuit and ground, at this time, the second end of the first voltage measurement unit 210 and the second end of the second voltage measurement unit 220 are both connected with the common ground 230, as shown in fig. 1, the leakage position point of the battery pack 100 is point P, the voltage between the positive electrode and the point P of the battery pack 100 is equal to the voltage across the positive electrode leakage resistance Rn to the ground, the voltage between the negative electrode and the point P of the battery pack 100 is equal to the voltage across the negative electrode leakage resistance Rp of the battery pack, because the battery pack 100 is formed by connecting multiple stages of batteries in series, the voltage of each stage is generally the same, at this time, further, the voltage between the negative electrode of the battery pack 100 and the point P and the voltage between the positive electrode of the battery pack 100 and the point P can determine the leakage position of the battery pack.
Above-mentioned battery package 100, through being provided with electric leakage detection circuitry 200, electric leakage detection circuitry 200 includes first voltage measurement unit 210 and second voltage measurement unit 220, first voltage measurement unit 210 measures anodal earth leakage resistance Rn both ends voltage, second voltage measurement unit 220 measures negative pole earth leakage resistance Rp both ends voltage, can realize the detection to negative pole earth leakage resistance Rp both ends voltage and anodal leakage resistance Rn both ends voltage, and then when taking place the electric leakage in battery package 100, judge the electric leakage position point according to negative pole earth leakage resistance Rp both ends voltage and anodal leakage resistance Rn both ends voltage, on the basis that does not increase the hardware cost, maintenance personnel's maintenance work can be greatly made things convenient for, the safety risk when also having reduced maintenance personnel maintenance simultaneously.
In one embodiment, as shown in fig. 1, the first voltage measuring unit 210 includes a first voltage dividing resistor R1, a second voltage dividing resistor R2 and a first switching unit S1 connected in series, both ends of the second voltage dividing resistor R2 are connected with a first voltmeter V1, and the second voltage dividing resistor R2 is smaller than the first voltage dividing resistor R1; the second voltage measuring unit 220 includes a third voltage dividing resistor R3, a fourth voltage dividing resistor R4, and a second switching unit S2 connected in series, both ends of the fourth voltage dividing resistor R4 are connected to a second voltmeter V2, and the third voltage dividing resistor R3 is larger than the fourth voltage dividing resistor R4.
Usually, the second voltage-dividing resistor R2 is smaller than and known as the first voltage-dividing resistor R1, and the voltage across the second voltage-dividing resistor R2 is measured by the first voltmeter V1, so as to obtain the voltage across the positive earth leakage resistor Rn; similarly, the third voltage dividing resistor R3 is greater than the fourth voltage dividing resistor R4, and the voltage at the two ends of the fourth voltage dividing point R4 is measured by the second voltmeter V2, so as to obtain the voltage at the two ends of the negative electrode ground leakage resistor Rp.
The first voltage measuring unit 210 and the second voltage measuring unit 220 measure the voltage by using a voltage division method, so that the leakage position point of the battery pack 100 can be timely and accurately determined when the battery pack 100 leaks electricity, and the speed and efficiency of detecting the leakage position of the battery pack 100 are indirectly improved.
In addition, as shown in fig. 2, a method for detecting a location of a battery pack leakage is provided, which is applied to the battery pack 100, and the method includes:
in step S310, the magnitude of the positive electrode-to-ground leakage resistance and the magnitude of the negative electrode-to-ground leakage resistance are calculated, respectively.
When the battery pack works normally, the size of the positive electrode earth leakage resistor and the size of the negative electrode earth leakage resistor need to be monitored, and the size of the electrode earth leakage resistor and the size of the negative electrode earth leakage resistor are respectively calculated at preset intervals so as to carry out all-around monitoring on the insulation state of the battery pack.
In step S320, whether the battery pack leaks electricity is determined according to the preset standard leakage resistance value, the magnitude of the positive electrode leakage resistance to the ground, and the magnitude of the negative electrode leakage resistance to the ground.
When the battery pack works normally and no electric leakage occurs, the size of the positive electrode earth leakage resistor and the size of the negative electrode earth leakage resistor of the battery pack are both larger than the preset standard electric leakage resistance value corresponding to the battery pack, in other words, once the battery pack leaks electricity, the size of the positive electrode earth leakage resistor and the size of the negative electrode earth leakage resistor of the battery pack are both lower than the preset standard electric leakage resistance value.
Generally, the predetermined standard leakage resistance value is usually 0.5 M.OMEGA.V.
In step S330, when it is determined that the battery pack is electrically leaked, the voltage to the ground of the positive electrode and the voltage to the ground of the negative electrode of the battery pack are obtained.
When the battery pack leaks electricity, the voltage between the positive pole of the battery pack and the electricity leakage position point is equal to the positive pole earth-to-ground voltage of the battery pack, the voltage between the negative pole of the battery pack and the electricity leakage position point is equal to the negative pole earth-to-ground voltage of the battery pack, at the moment, the voltage between the two ends of the positive pole earth-to-ground leakage resistor of the battery pack is equal to the positive pole earth-to-ground voltage, the voltage between the two ends of the negative pole earth-to-ground leakage resistor of the battery pack is equal to the negative pole earth-to-ground voltage, and the positive pole earth-to-ground voltage and the negative pole earth-to-ground voltage corresponding to the battery pack can be obtained by respectively measuring the voltages at the two.
And step S340, calculating to obtain a battery pack leakage position point according to the anode-to-ground voltage and the cathode-to-ground voltage.
Because the battery pack is formed by connecting multiple stages of batteries in series, the voltages of all stages of batteries of the battery pack are the same, and therefore, once the battery pack is short-circuited, after the sum of the absolute values of the positive electrode voltage to ground and the negative electrode voltage to ground is calculated, the ratio of the sum of the positive electrode voltage to ground and the absolute value is further calculated, and the actual leakage position point of the battery pack can be determined.
In one embodiment, as shown in fig. 3, step S310 includes:
in step S312, when the first switch unit is turned on and the second switch unit is turned off, the first voltage measurement unit obtains the first positive voltage-to-ground voltage of the battery pack, and a first corresponding relationship between the positive ground leakage resistor and the negative ground leakage resistor is established according to the first positive voltage-to-ground voltage, the total voltage of the battery pack, the size of the first voltage dividing resistor, and the size of the second voltage dividing resistor.
The first voltage measuring unit is used for obtaining the voltage to ground of the first anode of the battery pack, when the first switch is closed and the second switch is opened, the first voltage dividing resistor and the second voltage dividing resistor are connected in series and then are connected with the earth leakage resistor of the anode in parallel, and according to the voltage dividing proportional relation in the circuit, the first corresponding relation between the earth leakage resistor of the anode and the earth leakage resistor of the cathode can be established according to the voltage to ground of the first anode, the total voltage of the battery pack, the size of the first voltage dividing resistor and the size of the second voltage dividing resistor.
In one embodiment, the first voltage-dividing resistor is larger than the second voltage-dividing resistor, and the step of acquiring the voltage-to-ground of the first positive electrode of the battery pack by the first voltage measuring unit includes:
and measuring and obtaining a voltage division value of the second voltage division resistor, and calculating to obtain the voltage to ground of the first anode of the battery pack by combining the size of the first voltage division resistor and the size of the second voltage division resistor.
The voltage division method is adopted for measurement, the voltage to ground of the first anode of the battery pack can be quickly obtained, and therefore when the battery pack leaks electricity, the electric leakage position point of the battery pack can be timely and accurately determined, and the speed and efficiency of detecting the electric leakage position of the battery pack are indirectly improved.
Step S314, when the first switch unit is turned off and the second switch unit is turned on, the second voltage measurement unit obtains the first negative voltage-to-ground voltage of the battery pack, and a second corresponding relationship between the positive electrode ground leakage resistor and the negative electrode ground leakage resistor is established according to the first negative voltage-to-ground voltage, the total voltage of the battery pack, the size of the third voltage dividing resistor and the size of the fourth voltage dividing resistor.
In one embodiment, the third voltage dividing resistor is larger than the fourth voltage dividing resistor, and the step of obtaining the voltage-to-ground voltage of the first positive electrode of the battery pack by the first voltage measuring unit includes:
and measuring and obtaining a voltage division value of the fourth voltage division resistor, and calculating to obtain the voltage to ground of the first cathode of the battery pack by combining the size of the third voltage division resistor and the size of the fourth voltage division resistor.
The voltage division method is adopted for measurement, the voltage to ground of the first negative electrode of the battery pack can be quickly obtained, and therefore the electric leakage position point of the battery pack can be timely and accurately determined when the battery pack leaks electricity, and the speed and the efficiency of detecting the electric leakage position of the battery pack are indirectly improved.
And step S316, when the first switch unit and the second switch unit are closed, acquiring a second anode-to-ground voltage of the battery pack through the first voltage measuring unit, acquiring a second cathode-to-ground voltage of the battery pack through the second voltage measuring unit, and establishing a third corresponding relation between the anode-to-ground leakage resistor and the cathode-to-ground leakage resistor according to the second anode-to-ground voltage, the second cathode-to-ground voltage, the size of the first divider resistor, the size of the second divider resistor, the size of the third divider resistor and the size of the fourth divider resistor.
When the first switch unit and the second switch unit are both closed, the first divider resistor and the second divider resistor are connected in series and then are connected with the anode earth leakage resistor in parallel, the third divider resistor and the fourth divider resistor are connected in series and then are connected with the cathode earth leakage resistor in parallel, and after the second anode earth leakage voltage and the second cathode earth leakage voltage are obtained, the third corresponding relation between the anode earth leakage resistor and the cathode earth leakage resistor is established by further combining the size of the first divider resistor, the size of the second divider resistor, the size of the third divider resistor and the size of the fourth divider resistor.
In step S318, the magnitude of the positive earth leakage resistance and the magnitude of the negative earth leakage resistance are calculated according to any two of the first corresponding relationship, the second corresponding relationship, and the third corresponding relationship.
In one embodiment, the first corresponding relationship, the second corresponding relationship and the third corresponding relationship respectively correspond to the following formulas:
wherein, formula (1) represents the first corresponding relation, formula (2) represents the second corresponding relation, formula (3) represents the third corresponding relation, Rn// (R)1+R2) Represents Rn and (R)1+R2) Total resistance after parallel connection, Rp// (R)3+R4) Represents Rp and (R)3+R4) Total resistance after parallel connection, Un1Representing a first positive voltage to ground, Up1Representing the first negative voltage to ground, Un2Representing the second anode voltage to ground, Up2Representing the second negative voltage to ground, U representing the total voltage of the battery pack, R1Denotes a first divider resistance, R2Denotes a second divider resistance, R3Denotes a third voltage dividing resistance, R4The fourth voltage-dividing resistor is shown, Rn is the leakage resistance of the positive electrode to the ground, and Rp is the leakage resistance of the negative electrode to the ground.
In one embodiment, the calculation may be performed according to any two of the above equations (1), (2) and (3)
In one embodiment, the calculation formula of the battery pack leakage position point calculated in step S340 is as follows:
wherein, U in the formula (4)nRepresents the voltage of the positive electrode to the ground, U, when the battery pack leakspRepresents the voltage of the negative electrode to the ground, k, when the battery pack leaks1Means when the positive pole of the battery pack is taken as the starting pointThe position ratio of the leakage battery in the battery pack at the time of ignition, k2The position ratio of the leakage battery in the battery pack when the negative electrode of the battery pack is taken as a starting point is shown.
In one embodiment, the total number of the cells is 100, Un ═ 108V, Up ═ 252V, K ═ Un/(Un + Up) ═ 0.3, and the leakage cell string position is 0.3 × (100) ═ 3, that is, the 30 th string of cells starts to leak.
As shown in fig. 4, there is also provided a detection device 400 for detecting a location of a battery pack leakage, which is applied to the battery pack, the detection device 400 including:
a resistance calculation unit 410, configured to calculate a magnitude of the positive electrode to ground leakage resistance and a magnitude of the negative electrode to ground leakage resistance, respectively;
the leakage judging unit 420 is configured to judge whether the battery pack leaks electricity according to a preset standard leakage resistance value, the magnitude of the positive electrode leakage resistance to the ground, and the magnitude of the negative electrode leakage resistance to the ground;
a voltage acquisition unit 430, configured to acquire a positive voltage to ground and a negative voltage to ground of the battery pack when it is determined that the battery pack is electrically leaked;
and a leakage location point determining unit 440, configured to calculate a battery pack leakage location point according to the positive electrode voltage to ground and the negative electrode voltage to ground.
In addition, still provide a vehicle, set up above-mentioned battery package.
A readable storage medium, which stores a computer program that, when executed by a processor, implements the detection method described above.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention or a part of the technical solution that contributes to the prior art in essence can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (11)
1. A battery pack is characterized in that the battery pack is formed by connecting multiple stages of batteries in series and is provided with an electric leakage detection circuit, the electric leakage detection circuit comprises a first voltage measurement unit and a second voltage measurement unit, a first end and a second end of the first voltage measurement unit are respectively connected with two ends of an anode-to-ground electric leakage resistor of the battery pack and used for measuring voltages at two ends of the anode-to-ground electric leakage resistor, and a second end and a third end of the first voltage measurement unit are respectively used for being connected with two ends of a first voltmeter;
the first end and the second end of the second voltage measuring unit are connected with two ends of a negative electrode earth leakage resistor of the battery pack and used for measuring voltages at two ends of the negative electrode earth leakage resistor, the second end and the third end of the second voltage measuring unit are respectively used for being connected with two ends of a second voltmeter, and the second end of the first voltage measuring unit and the second end of the second voltage measuring unit are both connected with a common grounding end.
2. The battery pack according to claim 1, wherein the first voltage measuring unit includes a first voltage dividing resistor, a second voltage dividing resistor, and a first switching unit connected in series, the second voltage dividing resistor having both ends connected to the first voltmeter, the second voltage dividing resistor being larger than the first voltage dividing resistor; the second voltage measuring unit comprises a third voltage dividing resistor, a fourth voltage dividing resistor and a second switch unit which are connected in series, two ends of the fourth voltage dividing resistor are connected with the second voltmeter, and the third voltage dividing resistor is larger than the fourth voltage dividing resistor.
3. A method for detecting a location of a battery pack leakage, which is applied to the battery pack according to claim 1 or 2, the method comprising:
respectively calculating the magnitude of the positive electrode earth leakage resistor and the magnitude of the negative electrode earth leakage resistor;
judging whether the battery pack leaks electricity or not according to a preset standard leakage resistance value, the size of the anode-to-ground leakage resistance and the size of the cathode-to-ground leakage resistance;
when the battery pack is judged to be in electric leakage, acquiring the voltage to earth of the positive electrode and the voltage to earth of the negative electrode of the battery pack;
and calculating to obtain the leakage position point of the battery pack according to the voltage to ground of the anode and the voltage to ground of the cathode.
4. The detection method according to claim 3, wherein the detection method is applied to the battery pack according to claim 2, and the step of calculating the magnitude of the positive earth leakage resistance and the magnitude of the negative earth leakage resistance of the battery pack respectively comprises:
when the first switch unit is closed and the second switch unit is opened, acquiring a first anode-to-ground voltage of the battery pack through the first voltage measuring unit, and establishing a first corresponding relation between the anode-to-ground leakage resistor and the cathode-to-ground leakage resistor according to the first anode-to-ground voltage, the total voltage of the battery pack, the size of the first divider resistor and the size of the second divider resistor;
when the first switch unit is switched off and the second switch unit is switched on, acquiring a first negative electrode voltage-to-ground voltage of the battery pack through the second voltage measuring unit, and establishing a second corresponding relation between the positive electrode ground leakage resistor and the negative electrode ground leakage resistor according to the first negative electrode voltage-to-ground voltage, the total voltage of the battery pack, the size of the third voltage dividing resistor and the size of the fourth voltage dividing resistor;
when the first switch unit and the second switch unit are both closed, acquiring a second positive-electrode voltage-to-ground voltage of the battery pack through the first voltage measurement unit, acquiring a second negative-electrode voltage-to-ground voltage of the battery pack through the second voltage measurement unit, and establishing a third corresponding relation between the positive-electrode ground leakage resistor and the negative-electrode ground leakage resistor according to the second positive-electrode voltage-to-ground voltage, the second negative-electrode voltage-to-ground voltage, the size of the first divider resistor, the size of the second divider resistor, the size of the third divider resistor and the size of the fourth divider resistor;
and calculating the magnitude of the positive electrode earth leakage resistance and the magnitude of the negative electrode earth leakage resistance according to any two corresponding relations among the first corresponding relation, the second corresponding relation and the third corresponding relation.
5. The detection method according to claim 4, wherein the first correspondence, the second correspondence, and the third correspondence each correspond to a formula:
wherein formula (1) represents the first corresponding relationship, formula (2) represents the second corresponding relationship, formula (3) represents the third corresponding relationship, Rn// (R)1+R2) Represents Rn and (R)1+R2) Total resistance after parallel connection, Rp// (R)3+R4) Represents Rp and (R)3+R4) Total resistance after parallel connection, Un1Represents the voltage of the first anode to ground, Up1Representing the first negative voltage to ground, Un2Represents the second positive voltage to ground, Up2Representing the voltage of the second negative electrode to ground, U representing the total voltage of the battery pack, R1Represents the first divider resistance, R2Represents the second divider resistance, R3Represents the third voltage dividing resistance, R4Represents the fourth voltage-dividing resistor, Rn represents the leakage resistor of the anode to the ground, and Rp represents the leakage resistor of the cathode to the ground.
6. The detection method according to claim 4, wherein the first voltage-dividing resistor is larger than the second voltage-dividing resistor, and the step of acquiring the first positive voltage-to-ground voltage of the battery pack by the first voltage measurement unit comprises:
and measuring and obtaining a voltage division value of the second voltage division resistor, and calculating to obtain the voltage to ground of the first anode of the battery pack by combining the size of the first voltage division resistor and the size of the second voltage division resistor.
7. The detection method according to claim 4, wherein the third voltage dividing resistor is larger than the fourth voltage dividing resistor, and the step of acquiring the voltage to ground of the first negative electrode of the battery pack by the second voltage measurement unit comprises:
and measuring and obtaining a voltage division value of the fourth voltage division resistor, and calculating to obtain the voltage to ground of the first negative electrode of the battery pack by combining the size of the third voltage division resistor and the size of the fourth voltage division resistor.
8. The detection method according to claim 3, wherein the calculation formula for calculating the leakage position point of the battery pack according to the voltage to ground of the positive electrode, the voltage to ground of the negative electrode and the total voltage of the battery pack is as follows:
wherein, U in the formula (4)nRepresents the positive voltage to ground, UpRepresents the voltage, k, of the negative electrode to ground1Represents the position proportion, k, of the leakage battery in the battery pack when the positive electrode of the battery pack is taken as a starting point2The position proportion of the leakage battery in the battery pack is represented when the negative electrode of the battery pack is taken as a starting point.
9. A detection device for detecting a location of a battery pack leakage, which is applied to the battery pack according to claim 1 or 2, the detection device comprising:
the resistance calculation unit is used for calculating the magnitude of the positive electrode earth leakage resistance and the magnitude of the negative electrode earth leakage resistance respectively;
the leakage judging unit is used for judging whether the battery pack leaks electricity or not according to a preset standard leakage resistance value, the size of the anode-to-ground leakage resistance and the size of the cathode-to-ground leakage resistance;
the voltage acquisition unit is used for acquiring the voltage to ground of the positive electrode and the voltage to ground of the negative electrode of the battery pack when the battery pack is judged to be leaked;
and the leakage position point determining unit is used for calculating to obtain the battery pack leakage position point according to the anode voltage to ground and the cathode voltage to ground.
10. A vehicle characterized by being provided with the battery pack according to claim 1.
11. A readable storage medium, characterized in that it stores a computer program which, when executed by a processor, implements the detection method of any one of claims 3 to 8.
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