CN116358796B - Leakage detection method and leakage detection system for new energy power battery box - Google Patents
Leakage detection method and leakage detection system for new energy power battery box Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 70
- 230000005540 biological transmission Effects 0.000 claims abstract description 33
- 238000012360 testing method Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000008859 change Effects 0.000 claims abstract description 6
- 239000000700 radioactive tracer Substances 0.000 claims description 24
- 238000007599 discharging Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 113
- 238000007796 conventional method Methods 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a leakage detecting method and a leakage detecting system of a new energy power battery box body.A gas outlet of a detected object is also connected with a standard leakage hole through a leakage hole pipeline, the standard leakage hole penetrates through a detection tool and is communicated with a transmission channel, the corresponding relation between an electric signal change value read by a trace gas leakage detector and the corresponding concentration increment of sucked gas is calibrated after preliminary test by the trace gas leakage detector, and the leakage rate of the detected object is calculated by combining with a calibration relation of the trace gas leakage detector. The invention only needs one-time inflation test, utilizes the same concentration of trace gas in the tested object, the same test pressure in the tested object and the same calibration/detection tool to realize two functions of calibration and test, eliminates the test result deviation caused by inconsistent concentration, test pressure and tool, and improves the test accuracy.
Description
Technical Field
The invention belongs to the technical field of leakage detection, and particularly relates to a leakage detection method and a leakage detection system for detecting leakage of a new energy power battery box body.
Background
It is a conventional knowledge of those skilled in the art that the trace gas leak detector must be calibrated to test for an accurate test value. For a detected object (such as a new energy power battery box) unsuitable for leak detection by a vacuum pumping method, chinese patent CN115265935A discloses a leak detection method and a leak detection system of the box, in an embodiment of the leak detection method, at least two sets of tools are needed, one set of tools (leak detection tools) is arranged corresponding to a position to be detected of the box, and the leak detection tools collect gas leaking from a leak point at the position to be detected and convey the gas to a gas detection device (such as a helium mass spectrometer leak detector of a trace gas leak detector) through a pipeline; the other set of tool (calibration mechanism, namely the calibration tool) is provided with a standard leak hole, the calibration tool is a copying device made according to the corresponding position to be detected, and the gas in the box body to be detected is conveyed to the gas calibration detection device through the gas outlet, the calibration tool and the standard leak hole thereof; the gas detection device and the gas calibration detection device can be respectively used as the same set of tracer gas leak detectors. The leak detection method in the embodiment is also a conventional method, namely, after the calibration mechanism (including the standard leak) and the gas calibration detection device are used for calibrating, the leak rate of the position to be detected is detected through the leak detection tool and the gas detection device.
The conventional leak detection method is limited, the two sets of tools, particularly the gas paths in the tools, are required to be strictly isolated, the manufacturing cost of the tools is high, and inconsistent manufacturing of the tools can cause deviation on a test result, so that the test accuracy is affected.
Disclosure of Invention
In view of the above, the invention provides a leakage detection method and a leakage detection system for a new energy power battery box, which specifically comprises the following steps:
the leakage detecting system of the new energy power battery box body is characterized in that an inflation port of a detected object is connected with a trace gas source through an inflation pipeline, an exhaust port of the detected object is communicated with the outside atmosphere through an exhaust pipeline, and a second electromagnetic valve for controlling the on-off of the detected object is arranged on the exhaust pipeline; the device comprises a detection tool, a gas inlet pipe, a gas outlet pipe, a gas inlet pipe, a gas leakage detector, a gas inlet pipe, a gas outlet pipe, a gas inlet pipe and a gas outlet pipe, wherein a sealed collecting cavity is formed between the detection tool and the surface of a position to be detected of a detected object; the detection tool is also provided with a gas-supplementing port; the exhaust port is also connected with a standard leak through a leak hole pipeline, the standard leak hole passes through and is fixed on the detection tool and is communicated with the transmission channel, and a third electromagnetic valve for controlling the on-off of the leak hole pipeline is arranged on the leak hole pipeline.
The first port of the ports at the two ends of the transmission channel is arranged on the bottom wall of the cavity, which is away from the surface of the position to be detected of the object to be detected, of the collection cavity, the second port is arranged on the outer surface, which is away from the collection cavity, of the detection tool, and the air suction pipeline is fixedly communicated with the second port.
The inlet of the standard leak hole communicated with the transmission channel is adjacent to the first channel port of the transmission channel and relatively far away from the second channel port.
The hole axis of the standard leak hole is perpendicular to the channel axis of the transmission channel.
The channel openings of the air supply port and the transmission channel are respectively positioned at two opposite ends of the collecting cavity.
The leakage detecting method for the new energy power battery box body is characterized by adopting the leakage detecting system for the new energy power battery box body.
Further, the leak detection method comprises the following steps:
step S1, gas replacement is carried out, a trace gas source charges a detected object through an air charging port by an air charging pipeline, and simultaneously, the detected object is exhausted to the outside through an exhaust port by an exhaust pipe, the gas in the detected object is subjected to gas replacement, the concentration of the trace gas in the detected object is improved, and in the process, a leak hole pipeline is shut off;
step S2, preliminary testing, namely, cutting off an air charging pipeline and an air discharging pipeline, keeping a leak hole pipeline continuously cut off, starting a trace gas leak detector, and conveying gas in a collection cavity of a detection tool to the trace gas leak detector for preliminary testing through a transmission channel and an air suction pipeline of the leak detector to obtain an electric signal value read by the trace gas leak detector in the step;
step S3, calibrating, namely opening a leak hole pipeline, continuously keeping the air charging pipeline and the air discharging pipeline to be turned off, enabling trace gas in the tested object to enter a transmission channel of the detection tool through the air discharging port, the leak hole pipeline and the standard leak hole, and sucking the trace gas into the trace gas leak detector through the transmission channel and the air suction pipeline together with gas in the collecting cavity to calibrate: obtaining the electric signal value read by the tracer gas leak detector in the step;
and S4, calculating the leakage rate of the measured object.
Further, the corresponding relation between the standard leak rate and the reading concentration of the tracer gas leak detector is obtained by utilizing the corresponding relation between the electric signal change value and the corresponding concentration increment of the sucked gas respectively read by the tracer gas leak detector in the step S2 and the step S3, the relation between the concentration of the tracer gas leak detector and the leak rate is obtained through calculation, and the leak rate of the measured object is calculated by combining the characteristic equation of the tracer gas leak detector and the electric signal value brought into the measured object test.
Further, the electric signal is a voltage or a current, and the electric signal value is a voltage value or a current value.
The invention only needs one-time inflation test, utilizes the same concentration of trace gas in the tested object, the same test pressure in the tested object and the same (calibration/detection) tool to realize two functions of calibration and detection, eliminates the test result deviation caused by inconsistent concentration, test pressure and tool, and improves the test accuracy.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and to enable a person skilled in the pertinent art to make and use the invention.
Fig. 1 is a schematic diagram of a system structure according to an embodiment of the present invention.
Reference numerals in the drawings: 1-an inflation line; 2-a first solenoid valve; 3-an air charging port; 4-the object to be measured; 5-exhaust port; 6-a second solenoid valve; 7-an exhaust line; 8-a third solenoid valve; 9-standard leak holes; 10-tracer gas leak detector; 11-detecting a tool; 12-an air supplementing port; 13-transmission channels; 131-a first passage port; 132-a second port; 14-an air suction pipeline; 15-a leakage point of the measured object; 16-a collection chamber; 17-sealing rubber rings; 18-leak hole pipeline.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the embodiments of the present invention, it should be noted that, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally put in use of the product of the application, or the orientation or positional relationship conventionally understood by those skilled in the art, is merely for convenience of describing the present invention or simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured or operated in a specific orientation, and should not be construed as limiting the present invention.
The term "plurality" as used herein refers to more than two (including two). The terms "first," "second," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Unless specifically stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either directly or indirectly via an intermediary.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in the figure, in the leak detection system of the invention, an inflation port 3 of a detected object 4 is connected with a trace gas source (not shown in the figure) through an inflation pipeline 1, and the inflation pipeline 1 is provided with a first electromagnetic valve 2 for controlling the on-off of the inflation pipeline 1; the exhaust port 5 of the measured object is communicated with the outside atmosphere through an exhaust pipeline 7, and a second electromagnetic valve 6 for controlling the on-off of the exhaust pipeline 7 is arranged on the exhaust pipeline 7.
The detection tool 11 is arranged at the position to be detected of the detected object 4 in detection, a sealed collecting cavity 16 is formed between the detection tool 11 and the surface of the position to be detected of the detected object 4, and the collecting cavity 16 is used for collecting gas leaking from the leakage point 15 of the detected object.
The detection tool 11 is further provided with a transmission channel 13 communicated with the collection cavity 16, a first channel port 131 in channel ports at two ends of the transmission channel 13 is formed in the cavity bottom wall of the collection cavity 16, which is away from the surface of the position to be detected of the object 4 to be detected, a second channel port 132 is formed in the surface of the detection tool 11, which is away from the collection cavity 16, one end of an air suction pipeline 14 is fixedly communicated with the second channel port 132, the other end of the air suction pipeline is communicated with the trace gas leak detector 10, the trace gas leak detector 10 is provided with an air suction negative pressure device, the detection tool 11 is further provided with an air supplementing port 12 for communicating the collection cavity 16 with the outside air, the collection cavity of the leak detection tool collects leakage gas leaking from a leakage point at the position to be detected, and the leakage gas is conveyed to the trace gas leak detector 10 by the collection cavity through the transmission channel 13 and the air suction pipeline 14 under the suction effect of the air suction negative pressure device of the trace gas leak detector.
The detection tool 11 is provided with a sealing rubber ring 17 so as to enhance the sealing performance of the collecting cavity 16. And, more advantageously, the directionality of the air make-up of the collection chamber 16 is controlled by the air make-up port 12.
A leak hole pipeline 18 is also branched on the exhaust pipeline 7 between the exhaust port 5 and the second electromagnetic valve 6, the leak hole pipeline 18 is connected with a standard leak hole 9, the standard leak hole 9 is fixed on the detection tool 11 and is communicated with the transmission channel 13, and a third electromagnetic valve 8 for controlling the on-off of the leak hole pipeline 18 is arranged on the leak hole pipeline 18.
In some embodiments, the exhaust port 5 may be connected in parallel with the exhaust pipeline 7 and the leak hole pipeline 18 through a three-way member with one inlet and two outlets, that is, the air inlet end of the three-way member is connected with the exhaust port 5, the two air outlet ends of the three-way member are respectively connected with the exhaust pipeline 7 and the leak hole pipeline 18, the second electromagnetic valve 6 is responsible for controlling the on-off of the exhaust pipeline 7, and the third electromagnetic valve 8 is responsible for the on-off of the leak hole pipeline 18.
In some embodiments, the gas-filling port 12 is located at the opposite ends of the collection chamber 16, where the passage opening of the collection chamber 16 and the passage opening of the transmission passage 13 (the first passage opening 131) are located at the opposite ends of the collection chamber 16, respectively, i.e. the two are pulled as far as possible, so that enough space is left for the leaked gas to be collected and sucked away.
In some embodiments, the hole axis of the standard leak hole 9 is perpendicular to the channel axis of the transmission channel 13.
In some embodiments, the standard leak hole 9 is disposed at a position of the transmission channel 13 adjacent to the first channel opening 131, that is, the inlet port through which the standard leak hole 9 is communicated into the transmission channel 13 is adjacent to the first channel opening 131 of the transmission channel 13, and is relatively far from the second channel opening 132, so that two paths of gas (one path is from the collection chamber and the other path is from the exhaust port through the standard leak hole) are better mixed before reaching the trace gas leak detector, and the detection accuracy in this state is further improved.
The leak detection method is different from the conventional method, the conventional method is to calibrate firstly and then measure the leak rate, so that two sets of tools are needed, and the method only needs one set of tools, and the specific leak detection method is as follows:
s1, gas replacement, namely opening the first electromagnetic valve 2 and the second electromagnetic valve 6, closing the third electromagnetic valve 8, namely closing the leak hole pipeline 18, and simultaneously, inflating a tested object through an inflation port by a trace gas source through the inflation pipeline 1, exhausting the tested object to the outside through an exhaust port through an exhaust pipe, performing gas replacement on gas in the tested object, and improving the concentration of the trace gas in the tested object, wherein the leak hole pipeline 18 is closed in the process;
s2, performing preliminary test, namely closing the first electromagnetic valve 2, the second electromagnetic valve 6 and the third electromagnetic valve 8, namely closing the charging pipeline 1 and the exhaust pipeline 7, keeping the leak hole pipeline 18 closed, starting the trace gas leak detector 10, and conveying gas in a collection cavity of the detection tool to the trace gas leak detector 10 through the transmission channel 13 and the leak detector suction pipeline 14 for performing preliminary test to obtain an electric signal value read by the trace gas leak detector in the step;
s3, calibrating, namely opening the third electromagnetic valve 8, keeping the first electromagnetic valve 2 and the second electromagnetic valve 6 closed, namely opening the leak hole pipeline 18, keeping the inflation pipeline 1 and the exhaust pipeline 7 closed, enabling the trace gas in the measured object 4 to enter the transmission channel 13 of the detection tool through the exhaust port 5, the leak hole pipeline 18 and the standard leak hole 9, and being sucked into the trace gas leak detector 10 through the transmission channel 13 and the suction pipeline 14 together with the gas in the collecting cavity 16, and calibrating: obtaining the electric signal value read by the tracer gas leak detector in the step;
s4, calculating the leakage rate of the measured object.
In particular, the method comprises the steps of,
the leakage rate x of the measured object is the to-be-calculated quantity;
the concentration n of the trace gas in the measured object is an unknown constant;
the tracer gas leak detector suction flow a is a known constant;
the standard leak rate m is a known constant;
the concentration p of the trace gas is a variable;
the tracer gas leak detector calculates leak rate M as a variable;
the trace gas leak detector sensor voltage u is a variable;
the inductive functional relation (known characteristic functional relation of a certain trace gas leak detector) of the trace gas leak detector corresponding to the conversion of different body concentrations of the trace gas into voltages is p=f (u);
in the preliminary test of step S2, the value u of the electrical signal read by the trace gas leak detector x Is a known constant; the calculated concentration of trace gas in the tracer gas leak detector suction gas is p0=f (u x ) The method comprises the steps of carrying out a first treatment on the surface of the The actual concentration of trace gas in the gas sucked by the leak detector is；
In the calibration of step S3, the value u of the electrical signal read by the trace gas leak detector x+m Is a known constant; the calculated concentration of trace gas in the leak detector suction gas is p1=f (u x+m ) The method comprises the steps of carrying out a first treatment on the surface of the The actual concentration of trace gas in the gas sucked by the leak detector is；
From this, it can be calculated to increase the trace gas concentration increment corresponding to the standard leak hole leakage
；
Namely, in the step S3 calibration, the concentration change delta P of the trace gas leak detector is caused by the leakage of the standard leak hole with the leakage rate of m;
assuming that m=h (u) is a calibration relation (leakage rate and electrical signal relation) of the leak detector in the current detection state;
then, m=h (δu) =h (u) x+m -u x )；
The deduction is as follows: h (u) = (m, u) x+m -u x )(u)；
The electric signal u read when the leakage point of the detected object acts alone x Substituting h (u) to obtain the leakage rate x=h (u) x )=(m,u x+m -u x )(u x )。
In some embodiments, the electrical signal is a current or a voltage, and the corresponding electrical signal value is a current value or a voltage value.
Specific experimental examples are as follows:
the leakage rate x of the measured object is the to-be-calculated quantity;
the concentration n of the trace gas in the measured object is an unknown constant;
trace gas leak detector suction flow a=100 mL/min;
standard leak leakage rate m=0.006 mL/min (1E-5 pa.m 3 /s)；
The concentration p of the trace gas is a variable;
the tracer gas leak detector calculates leak rate M as a variable;
the trace gas leak detector sensor voltage u is a variable;
in the preliminary test of step S2, the voltage value u read by the trace gas leak detector x U is a known constant x =2.15V；
In the calibration of step S3, the voltage value u is read by the tracer gas leak detector x+m U is a known constant x+m =3.26V；
The induction function relation (known characteristic function relation of a certain trace gas leak detector) of the trace gas leak detector corresponding to the conversion of different body concentrations of the trace gas into voltage is that
p=f（u）=1.604×u^3+3.218×u^2+0.045u-1.09；
In the preliminary test of step S2, the calculated concentration of trace gas in the tracer gas leak detector suction gas is p0=f (u x )=f(2.15)=29.823ppm；
In the calibration of step S3, the calculated concentration of the tracer gas in the tracer gas leak detector suction gas is p1=f (u x+m )=f(3.26)=88.828ppm；
In the preliminary test of step S2, the actual concentration of the tracer gas in the suction gas of the tracer gas leak detector is；
In step S3 calibration, trace gas leak detectorThe actual concentration of trace gas in the inhaled gas is；
From this, it can be calculated to increase the trace gas concentration increment corresponding to the standard leak hole leakage
=(1E-5Pa.m 3 /s)×(98%)/(100mL/min)=(600×1E-5mL/min)×0.98/(100mL/min)=5.88E-5=58.8PPM；
That is, in the calibration of step S3, the leakage rate is m=0.006 mL/min, the leakage concentration change δp≡58.8PPM caused by the standard leakage hole; that is, the leak rate increases by m=0.006 mL/min, the concentration change δp≡58.8PPM;
assuming that m=h (u) is a calibration relation (leak rate and voltage relation) of the trace gas leak detector in the current detection state;
concentration p=m×n/a= (n/a) ×m;
leak rate m= (a/n) ×p
Namely, 0.006= (a/n) ×58.8
a/n=1.02E-4；
The deduction is as follows: m=h (u) = (a/n) ×p=1.02E-4×p=1.02E-4×f (u) =1.02E-4× (1.604×u≡3+3.218×u≡2+0.045u-1.09);
and finally outputting a result:
the electric signal u read when the leakage point of the detected object acts alone x Substituting m=h (u) to obtain the leakage rate of the measured object:
x=h(u x )=h(2.15)=1.02E-4×(1.604×(2.15)^3+3.218×(2.15)^2+0.045×(2.15)-1.09)=3.419E-3mL/min (5.698E-6Pa.m 3 /s)。
the foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. The leakage detecting system of the new energy power battery box body is characterized in that an inflation port (3) of a detected object (4) is connected with a trace gas source through an inflation pipeline (1), an exhaust port (5) of the detected object is communicated with the outside atmosphere through an exhaust pipeline (7), and a second electromagnetic valve (6) for controlling the on-off of the exhaust pipeline (7) is arranged on the exhaust pipeline; the device is characterized by also comprising a detection tool (11), a sealed collecting cavity is formed between the detection tool and the surface of the position to be detected of the detected object, a transmission channel (13) communicated with the collecting cavity is formed on the detection tool, the tracer gas leak detector (10) is connected with the transmission channel through an air suction pipeline (14),
the air charging pipeline (1) is provided with a first electromagnetic valve (2) for controlling the on-off of the air charging pipeline; the detection tool (11) is also provided with a gas-supplementing port (12); the exhaust port (5) is also connected with a standard leak hole (9) through a leak hole pipeline (18), the standard leak hole (9) passes through and is fixed on the detection tool and is communicated with the transmission channel (13), and a third electromagnetic valve (8) for controlling the on-off of the leak hole pipeline (18) is arranged on the leak hole pipeline.
2. The leakage detection system of the new energy power battery box body according to claim 1, wherein a first channel port (131) in channel ports at two ends of the transmission channel (13) is formed in a cavity bottom wall of the collection cavity (16) deviating from the surface of the detected position of the detected object, a second channel port (132) is formed in the outer surface of the detection tool (11) deviating from the collection cavity (16), and the air suction pipeline (14) is fixedly communicated with the second channel port (132).
3. The leakage detection system of the new energy power battery box according to claim 2, wherein the standard leakage hole (9) is communicated with the inlet opening into the transmission channel (13) adjacent to the first channel opening (131) of the transmission channel (13) and relatively far away from the second channel opening (132).
4. The leakage detection system of the new energy power battery box body according to claim 1, wherein the hole axis of the standard leakage hole (9) is perpendicular to the channel axis of the transmission channel (13).
5. The leakage detection system of the new energy power battery box body according to claim 1, wherein the air supplementing port (12) and the transmission channel (13) are respectively positioned at two opposite ends of the collection cavity at the channel opening of the collection cavity.
6. The leakage detection method for the new energy power battery box body is characterized in that the leakage detection system for the new energy power battery box body is adopted.
7. The leakage detection method for a new energy power battery box according to claim 6, comprising:
step S1, gas replacement is carried out, a trace gas source charges a detected object through an air charging port by an air charging pipeline, and simultaneously, the detected object is exhausted to the outside through an exhaust port by an exhaust pipe, the gas in the detected object is subjected to gas replacement, the concentration of the trace gas in the detected object is improved, and in the process, a leak hole pipeline is shut off;
step S2, preliminary testing, namely, cutting off an air charging pipeline and an air discharging pipeline, keeping a leak hole pipeline continuously cut off, starting a trace gas leak detector, and conveying gas in a collection cavity of a detection tool to the trace gas leak detector for preliminary testing through a transmission channel and an air suction pipeline of the leak detector to obtain an electric signal value read by the trace gas leak detector in the step;
step S3, calibrating, namely opening a leak hole pipeline, continuously keeping the air charging pipeline and the air discharging pipeline to be turned off, enabling trace gas in the tested object to enter a transmission channel of the detection tool through the air discharging port, the leak hole pipeline and the standard leak hole, and sucking the trace gas into the trace gas leak detector through the transmission channel and the air suction pipeline together with gas in the collecting cavity to calibrate: obtaining the electric signal value read by the tracer gas leak detector in the step;
and S4, calculating the leakage rate of the measured object.
8. The leakage detection method of the new energy power battery box body according to claim 7, wherein the relation between the standard leakage rate of the leakage hole and the reading concentration of the tracer gas leakage detector is obtained by utilizing the corresponding relation between the electric signal change value read by the tracer gas leakage detector in the step S2 and the step S3 and the corresponding concentration increment of the sucked gas, the relation between the concentration of the tracer gas leakage detector and the leakage rate is obtained through calculation, and the leakage rate of the detected object is calculated by combining the characteristic equation of the tracer gas leakage detector and the electric signal value brought into the detected object.
9. The leakage detection method for the new energy power battery box body according to claim 8, wherein the electric signal is voltage or current, and the electric signal value is voltage value or current value.
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