CN115036626A - Battery cover plate structure, sealed helium detector and helium detection method thereof - Google Patents
Battery cover plate structure, sealed helium detector and helium detection method thereof Download PDFInfo
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- CN115036626A CN115036626A CN202110245432.9A CN202110245432A CN115036626A CN 115036626 A CN115036626 A CN 115036626A CN 202110245432 A CN202110245432 A CN 202110245432A CN 115036626 A CN115036626 A CN 115036626A
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- helium
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- valve
- vacuum
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- 239000001307 helium Substances 0.000 title claims abstract description 311
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 311
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 311
- 238000001514 detection method Methods 0.000 title claims abstract description 188
- 238000007789 sealing Methods 0.000 claims abstract description 78
- 238000003466 welding Methods 0.000 claims abstract description 38
- 239000003292 glue Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims description 61
- 238000005086 pumping Methods 0.000 claims description 58
- 238000004140 cleaning Methods 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 description 20
- 239000007789 gas Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 238000007689 inspection Methods 0.000 description 7
- 239000004033 plastic Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- 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
- G01M3/202—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 using mass spectrometer detection systems
- G01M3/205—Accessories or associated equipment; Pump constructions
-
- 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
- G01M3/225—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 welds
-
- 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 application provides a battery cover plate structure, helium of sealing examine machine and helium and examine the method, and battery cover plate structure includes apron, glue nail and sealed nail, and sealed nail welding is on annotating liquid counter bore step on the apron, glue nail and annotate liquid hole interference fit on the apron, and the head of glue nail is equipped with the slot on the surface. Set up the slot on the head surface of nail will glue in this application, increase the surface area of absorption helium, follow-up when helium is examined at helium detection station helium, promoted the helium volume that overflows, and then increased the sensitivity that the helium of backpressure examined. The application also provides a helium detection method of the sealed helium detector, wherein the vacuumizing action and the helium detection action are independently performed in the helium detection method, after all the battery cover plate structures are vacuumized, helium diffused into the helium detection cavity is completely sealed in the helium detection cavity, the helium does not escape, enough helium is provided for detection of a mass spectrometer, and the problem of misjudgment in the existing helium detection method of the sealed helium detector is solved.
Description
Technical Field
The application relates to the technical field of battery helium detection, in particular to a battery cover plate structure, a sealing helium detector and a helium detection method of the sealing helium detector.
Background
In the prior art, as shown in fig. 1, a rubber plug in a rubber nail is partially used in an interference fit manner to plug a liquid injection hole in a conventional battery cover plate structure, a metal sealing nail is covered after the rubber nail is plugged, and then the sealing nail is welded with a cover plate. The glue nail and the cover plate form internal sealing, and the sealing nail and the liquid injection counter bore on the cover plate form external sealing for the glue nail after being welded.
The disadvantages of the prior art solutions are as follows: in the battery cover plate structure, the plastic head part of the glue nail is flat in surface and made of hard plastic, so that the helium adsorption capacity is reduced, the amount of overflowed helium is reduced during subsequent helium detection at a helium detection station, and the sensitivity of backpressure helium detection is reduced. In addition, the helium detection method of the sealed helium detector in the prior art has the problem of misjudgment.
Disclosure of Invention
The application aims to provide a battery cover plate structure, a sealing helium detector and a helium detection method thereof, and aims to solve the problems that the sensitivity of helium detection is low due to the adoption of the battery cover plate structure in the prior art and the helium detection method of the existing sealing helium detector has misjudgment.
The first aspect of the embodiment of the application provides a battery cover plate structure, battery cover plate structure includes apron, glue nail and sealed nail, sealed nail welding is in on annotating liquid counter bore step on the apron, glue nail with annotate liquid hole interference fit on the apron, the head of glue nail is equipped with the slot on the surface.
The utility model provides a helium inspection machine seals, it includes mechanical pump, mass spectrograph, at least one sealed head to seal the helium inspection machine, the main pipeline in vacuum is connected to the mechanical pump, the main pipeline in vacuum and every sealed head are through a vacuum branch pipeline UNICOM, every sealed head press one if the first aspect battery cover plate structure, be equipped with a rough pumping valve on every vacuum branch pipeline, the mass spectrograph examines a plurality of helium inspection branch pipelines of main pipeline UNICOM through the helium, is equipped with a detection valve on every helium inspection branch pipeline, helium inspection main pipeline UNICOM the main pipeline in vacuum, wherein, the vacuum branch pipeline with the UNICOM point that the branch pipeline was examined to the helium is located rough pumping valve with between the sealed head.
The third aspect of the present application provides a helium testing method for a sealed helium testing machine, where the helium testing method includes:
sequentially controlling each rough pumping valve to enable the mechanical pump to vacuumize each battery cover plate structure;
and sequentially controlling each detection valve to enable the mass spectrometer to carry out helium detection on each battery through each battery cover plate structure so as to obtain a helium detection result of each battery.
The fourth aspect of the present application provides a helium testing method for a sealed helium testing machine, where the helium testing method includes:
controlling all rough pumping valves and all vacuum valves to simultaneously pump all battery cover plate structures by a mechanical pump;
and sequentially controlling each detection valve to enable the mass spectrometer to carry out helium detection on each battery through each battery cover plate structure so as to obtain a helium detection result of each battery.
The application provides a battery cover plate structure, helium of sealing examine machine and helium and examine the method, and battery cover plate structure includes apron, glue nail and sealed nail, and sealed nail welding is on annotating liquid counter bore step on the apron, glue nail and annotate liquid hole interference fit on the apron, and the head of glue nail is equipped with the slot on the surface. Set up the slot on the head surface of nail will glue in this application, increase the surface area of absorption helium, follow-up when helium is examined at helium detection station helium, promoted the helium volume that overflows, and then increased the sensitivity that the helium of backpressure examined. The application also provides a helium detection method of the sealing helium detector, which comprises the following steps: sequentially controlling each rough pumping valve to enable a mechanical pump to pump vacuum for each battery cover plate structure; and sequentially controlling each detection valve to enable a mass spectrometer to carry out helium detection on each battery through each battery cover plate structure so as to obtain a helium detection result of each battery.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments or the prior art description will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings may be obtained according to these drawings without inventive labor.
Fig. 1 is a structural diagram of a battery cover plate structure provided in the prior art;
fig. 2 is a structural diagram of a battery cover plate structure according to an embodiment of the present disclosure;
FIG. 3 is a top view and a front view of one embodiment of a glue nail in a battery cover plate structure provided in one embodiment of the present application;
FIG. 4 is a top view and a front view of another embodiment of a glue nail in a battery cover plate structure provided in the first embodiment of the present application;
FIG. 5 is a top view and a front view of another embodiment of a glue nail in a battery cover plate structure according to a first embodiment of the present disclosure;
fig. 6 is a bottom view of a sealing nail in a battery cover plate structure according to an embodiment of the present disclosure;
fig. 7 is a structural diagram of a battery cover plate structure according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a sealing helium detector provided in the second embodiment of the present application;
fig. 9 is another schematic structural diagram of a sealing helium detector provided in the second embodiment of the present application;
fig. 10 is a flowchart of a helium testing method of a sealed helium testing machine according to a third embodiment of the present application;
fig. 11 is a schematic structural diagram of a sealing helium inspection machine provided in the third embodiment of the present application;
fig. 12 is a schematic structural diagram of a sealing helium detector provided in the fourth embodiment of the present application;
fig. 13 is another schematic structural diagram of a helium detector for sealing provided in the fourth embodiment of the present application;
fig. 14 is a flowchart of a helium testing method of a sealed helium testing machine according to a fifth embodiment of the present application;
fig. 15 is a schematic structural diagram of a sealing helium detector provided in the fifth embodiment of the present application;
fig. 16 is a schematic structural diagram of a buffer tank attached to a sealed helium detector provided in the fifth embodiment of the present application;
fig. 17 is a schematic structural diagram of a battery sealing head attached to a sealed helium detector according to a fifth embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In order to explain the technical means of the present application, the following description will be given by way of specific examples.
Example one
An embodiment of the present application provides a battery cover plate structure, as shown in fig. 2, the battery cover plate structure includes:
the battery cover plate structure comprises a cover plate 10, a rubber nail 20 and a sealing nail 30, the sealing nail 30 is welded on a liquid injection counter bore step 11 on the cover plate 10, the rubber nail 20 is in interference fit with a liquid injection hole 12 on the cover plate 10, and a groove 13 is formed in the surface of the head of the rubber nail 20.
The problem of low sensitivity of helium detection caused by the adoption of a battery cover plate structure in the prior art is analyzed as follows: in the prior art, as shown in fig. 1, because the plastic head portion of the rubber nail 20 is flat and made of hard plastic, when a back pressure helium testing process is used to detect the welding condition between the sealing nail 30 and the cover plate, if a welding leak exists, helium enters the space between the sealing nail 30 and the rubber nail 20 from the welding leak at a helium pressing station, and is partially adsorbed on the surfaces of the plastic head portion of the rubber nail 20 and the rubber plug portion of the rubber nail 20 (only the non-extruded portion of the rubber plug portion can adsorb helium), but because the existing rubber plug is flat in surface and is subjected to plastic hardening treatment, the capacity of adsorbing helium is reduced, so that the amount of helium overflowing during subsequent helium testing at the helium testing station is reduced, and the sensitivity of the back pressure helium testing is reduced. In order to solve the above problem, the present embodiment provides a groove on the surface of the head of the glue nail 20. The technical effects of the embodiment are as follows: the grooves are formed in the surface of the head of the rubber nail 20, so that the surface area of adsorbed helium is increased, the amount of overflowed helium is increased during subsequent helium detection at a helium detection station, and the sensitivity of backpressure helium detection is increased.
In one embodiment, as shown in fig. 5 of fig. 2, the groove 13 has a straight, cross, m-shaped or circular shape, and the groove 13 has a U-shaped, V-shaped or square-shaped cross section. Wherein, the width value W of the groove belongs to [ 0.1mm, 0.5mm ], and the depth value I of the groove 13 belongs to [ 0.1mm, 0.5mm ].
The technical effects of the embodiment are as follows: the grooves are set to be in different required shapes, the surface area for adsorbing helium is increased, and the sensitivity of backpressure helium detection is further increased.
As an embodiment, the rubber nail 20 is made of soft rubber material, and the technical effects of the embodiment are as follows: on the one hand, the difficulty and the cost of the process are reduced, on the other hand, the weight of helium adsorbed by the rubber plug can be increased, and the sensitivity of helium detection is increased.
As an embodiment, as shown in fig. 2 and 6, the width of the edge of the sealing nail 30 protruding from the lower surface is smaller than the width of the liquid injection counterbore step on the cover plate 10.
In the prior art, the contact surface between the lower surface of the sealing nail 30 and the cover plate 10 is smooth, and after the sealing nail 30 is welded to the cover plate 10, the lower surface of the sealing nail 30 is tightly contacted with the cover plate 10, so that helium gas is difficult to enter during helium pressurization, and particularly helium gas is difficult to escape during helium detection, thereby reducing the sensitivity of the back pressure helium detection. In this embodiment, the width of the edge protruding from the lower surface of the sealing nail 30 is smaller than the width of the liquid injection counter bore step 11 on the cover plate 10, and the width of W2 is reduced to be smaller than the width of the liquid injection counter bore step 11, so that the contact area between the lower surface of the sealing nail 30 and the cover plate 10 can be reduced, and helium gas can escape more easily.
The technical effects of the embodiment are as follows: the width of the edge protruding from the lower surface of the sealing nail 30 is smaller than the width of the liquid injection counter bore step on the cover plate 10, on one hand, the volume of the inner cavity is increased by reducing the width of the edge, on the other hand, the contact area between the lower surface of the sealing nail 30 and the cover plate 10 is reduced, the distance between helium entering from the leak hole and passing through two contact planes is reduced, helium in the inner cavity is easier to be helium, and the sensitivity of backpressure helium detection is increased.
As an embodiment, as shown in fig. 7, the inner circle of the edge of the sealing nail 30 protruding from the lower surface is chamfered. The technical effects of the embodiment are as follows: the inner ring of the seal nail is made into a certain chamfer angle, so that helium can more easily enter and exit the inner cavity of the seal nail 30.
Example two
The second embodiment of the application provides a helium detector seals, as shown in fig. 8 and fig. 9, helium detector seals includes mechanical pump 40, mass spectrometer 50, at least one sealed head 80, and the main pipeline in vacuum is connected to mechanical pump 40, and the main pipeline in vacuum and every sealed head are through a vacuum branch pipeline UNICOM, and every sealed head 80 presses the battery cover plate structure 90 in the first of above-mentioned embodiment, is equipped with a thick extraction valve 60 on every vacuum branch pipeline, and mass spectrometer 50 is equipped with a thick extraction valve on through every vacuum branch pipeline, a plurality of helium of main pipeline UNICOM of mass spectrometer pass through helium are examined branch pipeline, are equipped with a check valve 70 on every helium is examined branch pipeline, helium examine main pipeline UNICOM vacuum main pipeline, wherein, vacuum branch pipeline with the UNICOM point of helium is located thick extraction valve 60 with between the sealed head 80.
The technical effects of the embodiment are as follows: the grooves are formed in the surface of the head of the glue nail in the sealing helium detector, so that the surface area for adsorbing helium is increased, the amount of overflowed helium is increased during helium detection at a helium detection station subsequently, and the sensitivity of backpressure helium detection is increased.
EXAMPLE III
An embodiment of the present application provides a helium testing method of a sealed helium detector as in the second embodiment, and as shown in fig. 10, the helium testing method includes:
s101, sequentially controlling each rough pumping valve to enable a mechanical pump to vacuumize each battery cover plate structure;
and S102, sequentially controlling each detection valve to enable the mass spectrometer to carry out helium detection on each battery through each battery cover plate structure so as to obtain a helium detection result of each battery.
The helium detection method of the seal helium detector in the prior art has the problem of misjudgment, and is analyzed as follows:
as shown in fig. 9, each battery cover plate structure corresponds to one battery, taking the first battery corresponding to the first battery cover plate structure as an example, after the helium pressing is performed on the first battery sealing port at the helium pressing station for a certain time, the tray is transferred to the helium detection station, the sealing head is pressed downwards, the rubber sealing ring on the sealing head forms a first space 81 for the sealing nail and the welding area of the first battery, helium gas molecules in the first space 81 immediately leak to a second space 82 (assuming that there is a welding leak in the welding area of the sealing nail and the cover plate, if there is no welding leak, adsorbed helium molecules on the surface of the sealing nail leak into the second sealing space 82), then the mechanical pump evacuates the second space 82 to the detection valve opening pressure (generally equal to or less than 90pa, preferably equal to or less than 40pa, most preferably equal to or less than 20pa), then the rough valve of the first battery is closed, the detection valve of the first battery is opened, performing helium detection on the first battery, if the leakage rate of the first battery is normal, detecting the first battery to be qualified, closing the detection valve, vacuumizing the second battery corresponding to the second battery cover plate structure, performing helium detection on the second battery, and performing helium detection on the second battery in sequence; if the leakage rate of the first battery exceeds the standard, the detection is unqualified, the detection valve of the first battery is closed, nitrogen is filled in a pipeline connecting the first battery and a mass spectrometer to remove residual helium, the helium concentration in the pipeline is close to the background concentration after the helium is removed, and the single cavity cleaning time is about 10 s. A helium testing mass spectrometer is used for testing a plurality of detection channels, and when a front battery is in helium testing at a helium testing station, because the battery cover plate structures are vacuumized and detected one by one, the waiting time of the rear battery is too long, particularly, the welding sealing nails with unqualified detection are arranged in the front (because each unqualified welding sealing nail needs to pass through the helium cleaning time of about 10s of a pipeline), the helium in the sealing cavity in the cover plate to be detected at the rear is diffused into the helium detection cavity in a large amount, during helium testing of the channel, the vacuum is pulled to cause diffused helium (the helium occupied by the second space in FIG. 8) to be pumped away together, therefore, the leak rate during helium testing is lower, especially for the last stations and under the condition that the former stations leak greatly, the leak rate of the latter stations is lower than the actual value, therefore, the sealing nail which is unqualified and welded and is greater than the standard leakage rate is judged as the sealing nail which is qualified and welded by mistake.
In the embodiment, after the helium pressing is performed on the battery sealing port at the helium pressing station for a certain time, the tray is transferred to the helium checking station, the sealing shaft is pressed and sealed, the adopted helium checking method is that each rough pumping valve is sequentially controlled to enable the mechanical pump to pump vacuum on each battery cover plate structure, then each detection valve is sequentially controlled to enable the mass spectrometer to carry out helium checking on each battery through each battery cover plate structure, namely, the vacuumizing action and the helium checking action are independently performed, and after all battery cover plate structures are vacuumized, helium diffused into the helium checking cavity is completely sealed in the helium checking cavity, so that the helium does not escape and is sufficient for detection, and the sealing nail which is unqualified in welding and larger than the standard leak rate is prevented from being mistakenly judged as the sealing nail which is qualified in welding.
For step S101, as an embodiment, sequentially controlling each rough exhaust valve to enable a mechanical pump to perform vacuum pumping on each battery cover plate structure includes:
and S111, controlling the first rough pumping valve to be opened, so that the mechanical pump vacuumizes a first battery cover plate structure correspondingly connected with the first rough pumping valve.
And S112, when the pressure in a first vacuum branch pipe communicated with the first rough pumping valve is detected to reach a preset value, controlling the mechanical pump to stop vacuumizing, and closing the first rough pumping valve.
And S113, after the first battery cover plate structure is vacuumized, sequentially controlling the opening and the closing of the residual rough vacuumizing valves until the last battery cover plate structure is vacuumized.
As shown in fig. 11, a first battery cover board corresponds to a # 1 battery, the first battery cover board is connected with a first rough pumping valve and a first detection valve, a second battery cover board corresponds to a # 2 battery, the second battery cover board is connected with a second rough pumping valve and a second detection valve, a third battery cover board corresponds to a # 3 battery, the third battery cover board is connected with a third rough pumping valve and a third detection valve, a fourth battery cover board corresponds to a # 4 battery, the fourth battery cover board is connected with a fourth rough pumping valve and a fourth detection valve, a tray is transferred to a helium detection station after a battery sealing port carries out helium pressing for a certain time at the helium pressing station, a sealing shaft is pressed downwards for sealing, the first rough pumping valve is opened, when a mechanical pump vacuumizes the # 1 battery to a set value of 90pa, the first rough pumping valve of the # 1 battery is closed, the second rough pumping valve is opened, the # 2 battery is immediately vacuumized, and the second rough pumping valve of the # 2 battery is closed after completion, and opening a third rough pumping valve, immediately vacuumizing the 3# battery, closing the third rough pumping valve of the 3# battery after the third rough pumping valve is completed, opening a fourth rough pumping valve, immediately vacuumizing the 4# battery, and closing the fourth rough pumping valve of the 4# battery after the fourth rough pumping valve is completed. After the vacuum is pumped, helium diffused into the helium detection cavity is completely sealed in the helium detection cavity, so that the helium does not escape and enough helium is available for detection of the mass spectrometer.
For step S102, as an embodiment, sequentially controlling each detection valve to enable the mass spectrometer to perform helium detection on each cell through each cell cover plate structure includes:
and S121, controlling a first detection valve to open so that the mechanical pump performs helium detection on the first battery in the first battery cover plate structure.
And S122, when the helium detection result is qualified, closing the first detection valve and opening the next detection valve.
And S123, when the helium detection result is unqualified, closing the first detection valve, performing cavity cleaning treatment on the helium detection main pipeline and the first helium detection branch pipeline, and then opening the next detection valve.
As shown in fig. 11, after vacuum pumping, opening a first detection valve of the 1# battery to perform helium detection on the 1# battery, if the helium detection is qualified, closing the first detection valve, and opening a second detection valve of the 2# battery, if the helium detection is not qualified, performing cavity cleaning treatment, completing cavity cleaning, and opening the second detection valve of the 2# battery; and (4) until helium detection of the 2# battery, the 3# battery and the 4# battery is completed. The helium diffused into the helium detection cavity is completely sealed in the helium detection cavity, and enough helium is provided for detection of a mass spectrometer, so that the sealing nail which is unqualified in welding and has a leakage rate greater than a standard leakage rate is prevented from being mistakenly judged as a sealing nail which is qualified in welding.
The detection method of the embodiment performs the vacuumizing action and the helium detection action independently, because the vacuumizing time (about 1 s) is less than the helium detection time (2-4 s), the vacuumizing is performed before, the vacuumizing action is performed after the helium detection, the vacuumizing action is sequentially continued from the 1# battery, the 2# battery and the 3# battery to the following battery, and the helium detection action is also performed independently, the 1# battery, the 2# battery and the 3# battery are sequentially continued to the following battery, because the vacuumizing time is shorter, helium diffused into the helium detection cavity by the following channel within the accumulated vacuumizing time of the preceding channel is less, and after the vacuumizing, helium diffused into the helium detection cavity is completely sealed in the helium detection cavity, so the helium does not escape, enough helium is provided for the mass spectrometer for detection, and the sealing nail which is unqualified in welding and has a leakage rate greater than the standard is prevented from being mistakenly judged as a qualified welding sealing nail.
The present embodiment is specifically described by the following specific experimental data:
positive pressure helium test conditions:
(1) helium pressure is 750-800 mbar;
(2) pressure maintaining time: 2 s;
(3) detection time: 4 s.
Positive pressure detection standard: the positive pressure leak rate is less than or equal to 5.0E-05; record as OK, otherwise NG.
Description of the samples:
all the A # -F # samples adopt the improved rubber nails of the invention, and are good welding samples (or smooth metal plates).
TABLE 1
| Sample number | A# | B# | C# | D# | E# | F# |
| Welding state (appearance inspection) | Good effect | Is good | Is good | Is good | Good effect | Optical metal plate |
| Positive pressure helium detection leak rate | 4.31E-08 | 5.62E-08 | 5.62E-08 | 5.89E-08 | 1.73E-07 | 1.21E-08 |
| Evaluation result | OK | OK | OK | OK | OK | OK |
(1) G # -L # samples, all the rubber nails improved by the invention are poor welding samples (or smooth rubber nails).
TABLE 2
The helium detector used in the invention comprises:
the invention adopts a 6-channel helium pressing station and a 6-channel helium detecting station to detect the leakage rate of the battery cover plate, and the helium pressing station corresponds to the helium detecting station one by one.
The test method comprises the following steps:
(1) the helium filling pressure of the helium pressing station is 4100-4200 mbar;
(2) the helium pressing time of the helium pressing station is 120 s;
(3) leak rate test time: 4 s;
(4) and (3) leakage rate evaluation standard: less than or equal to 5.0E-6; judging as OK; otherwise NG.
Experiment 1
The A # -F # samples were numbered and arranged as shown in Table 3-1-1 as follows:
TABLE 3-1
| Sample numbering | S3-1-1# | S3-1-2# | S3-1-3# | S3-1-4# | S3-1-5# | S3-1-6# |
| Corresponding sample | A# | B# | C# | D# | E# | F# |
| State of welding | OK | OK | OK | OK | OK | OK |
The helium detection test is carried out on the helium detector with 6 channels prepared by the invention, and each sample is tested repeatedly for 3 times: the test results are shown in the following tables 3-1-2.
Tables 3-1-2
Experiment 2
The G # -L # samples were prepared as follows in the arrangement of tables 3-4.
TABLE 3-2-1
| Sample numbering | S3-2-1# | S3-2-2# | S3-2-3# | S3-2-4# | S3-2-5# | S3-2-6# |
| Corresponding sample | G# | H# | I# | J# | K# | L# |
| State of welding | NG | NG | NG | NG | NG | NG |
The helium detection test is carried out on the helium detector with 6 channels prepared by the invention, and each sample is tested repeatedly for 3 times: the test results are shown in the following tables 3-2-2:
TABLE 3-2
| Sample number | Channel number | Leak rate 1 | Leak rate 2 | Leak rate 3 | Positive pressure determination result | Determination result of back pressure |
| S3-2-1# | 1 | 1.94E-05 | 1.95E-05 | 1.93E-05 | NG | NG |
| S3-2-2# | 2 | 3.73E-05 | 3.70E-05 | 3.74E-04 | NG | NG |
| S3-2-3# | 3 | 1.10E-04 | 1.09E-04 | 1.14E-04 | NG | NG |
| S3-2-4# | 4 | 2.26E-05 | 2.15E-05 | 2.16E-05 | NG | NG |
| S3-2-5# | 5 | 8.86E-05 | 9.46E-05 | 7.93E-05 | NG | NG |
| S3-2-6# | 6 | 7.75E-06 | 7.40E-06 | 7.64E-06 | NG | NG |
Experiment 3
The A # -L # samples were arranged in Table 3-3-1 as follows:
TABLE 3-3-1
MSA (physical System Alasye) analysis was performed on a 6-channel helium analyzer, 3 times for each sample, and repeatability and uniformity tests were performed.
The analysis results are shown in the following tables 3-3-2:
TABLE 3-3-2
The following are the results of analyzing the data of Table 3-3-2 using the mintab software, see Table 3-3-3 below:
tables 3-3
The six-channel sealing helium detector is improved by adopting the scheme of the invention, the MSA, GR and R of the six-channel sealing helium detector reach 17.19 percent and are less than 30 percent, and the MSA test is qualified.
Example four
The fourth embodiment of the application provides a machine is examined to sealed helium, on the basis of second embodiment, as shown in fig. 12, still be equipped with a vacuum valve on every vacuum branch pipeline, the vacuum valve is located between UNICOM's point and battery cover plate structure.
As shown in fig. 13, a vacuum valve 61 is added to each helium detection channel, a closed third space (the volume of which is V3) is formed between the vacuum valve and the rough pumping valve, a second space (the volume of which is V2) is formed between the vacuum valve and the detection sealing head, a first space (the volume of which is V1) formed by the battery sealing nail, the cover plate and the glue nail is set to be γ ═ V3/(V1+ V2), and when the gas pressure of the third space is smaller than the opening pressure of the detection valve (generally equal to or less than 90pa, preferably equal to or less than 40pa, and most preferably equal to or less than 20pa) after the vacuum valve 61 is opened and the gas of the second space enters the third space, γ is equal to or greater than 33 (preferably equal to or greater than 50, and most preferably equal to or greater than 100). Because the volume of the first space is small and basically kept constant, the volume of the third space needs to be increased as much as possible, and the volume of the second space needs to be reduced. In the scheme of the invention, an additional buffer tank can be connected to the third space to increase the volume of the third space; in order to reduce the volume of the second space as much as possible, the concave shape of the sealing shaft head can be changed into a flat head shape.
In the present embodiment, as shown in fig. 16, the size of the internal space of the buffer tank:
the internal diameter is 50mm and the length is 80mm, the volume of the third space, not counting the volume of the pipe, can be calculated as the internal space of the tank, approximately 157000mm 3; in this embodiment, the flat head seal shaft, as shown in fig. 17, the volume of the second space is 356.1mm3, regardless of the volume of the pipe; the volume of the first space of the present invention was calculated to be about 29.2mm 3.
γ＝V3/(V1+V2)＝407.5≥100。
In this embodiment, one mass spectrometer can be used to perform helium detection on the battery with any number of channels (e.g., more than 10 channels). One advantage of this scheme is: the multichannel helium detection stations are simultaneously vacuumized, the time for helium in the first space and the second space (provided that leak holes are formed in the welding positions of the sealing nails) to leak to the third space can be controlled, and the consistency of the flow time of detection gas is ensured; the accuracy of helium detection of each channel is ensured.
Another advantage of this scheme is: the vacuum valve has high sealing reliability, can ensure that the air pressure in the third space is kept constant within a long enough time and is smaller than the opening pressure (generally less than or equal to 90pa, preferably less than or equal to 40pa, and optimally less than or equal to 20pa) of the detection valve, and can avoid the defect of insufficient sealing performance of the rubber sealing ring of the sealing shaft.
EXAMPLE five
An embodiment of the present application provides a helium detection method for a sealed helium detector provided in the fourth embodiment, as shown in fig. 14, the helium detection method includes:
and S201, controlling all rough pumping valves and all vacuum valves to enable the mechanical pump to simultaneously pump vacuum to all battery cover plate structures.
And S202, sequentially controlling each detection valve to enable the mass spectrometer to perform helium detection on each battery through each battery cover plate structure so as to obtain a helium detection result of each battery.
In the helium detection method for the sealed helium detector provided in the third embodiment, when a mass spectrometer needs to detect a plurality of channels (for example, more than 20 channels), after vacuum pumping, the pressure of the helium detection cavity is only about 90pa, and the pressure difference between the inside and the outside of the cavity is close to one atmospheric pressure, and if all the previous batteries for helium detection are in an unqualified condition (the time required for each battery channel is close to 15s), how to ensure that the pressure of the helium detection cavity of the channel finally detected by helium is kept smaller than the valve-opening pressure (generally less than or equal to 90pa, preferably less than or equal to 40pa, and optimally less than or equal to 20pa) in such a long time is a difficulty of the scheme.
As shown in fig. 15, in this embodiment, a vacuum valve is added to each helium detection channel, a multi-channel helium detection station is adopted in the detection method to simultaneously perform vacuum pumping, and the time for helium in the first space and helium in the second space (provided that leak holes are formed at the welding positions of the sealing nails) to leak to the third space can be controlled, so as to ensure the consistency of the flow time of the detection gas; the accuracy of helium detection of each channel is ensured. The vacuum valve has high sealing reliability, can ensure that the air pressure in the third space is kept constant within a long enough time and is smaller than the opening pressure (generally less than or equal to 90pa, preferably less than or equal to 40pa, and optimally less than or equal to 20pa) of the detection valve, and can avoid the defect of insufficient sealing performance of the rubber sealing ring of the sealing shaft.
As an embodiment, the step S201 of controlling all rough-drawing valves and all vacuum valves to simultaneously draw vacuum to all battery cover plate structures by a mechanical pump includes:
s211, controlling all rough pumping valves to be opened simultaneously, and controlling all rough pumping valves to be closed simultaneously after the pressure values of the main vacuum pipeline and all vacuum branch pipelines communicated with the main vacuum pipeline are first preset pressure values;
s212, controlling the vacuum valve to be opened for a first preset time and then closing the vacuum valve;
s213, controlling all rough pumping valves to be opened simultaneously, and controlling all rough pumping valves to be closed simultaneously after the pressure values of the main vacuum pipeline and all vacuum branch pipelines communicated with the main vacuum pipeline are second preset pressure values;
and S214, controlling the vacuum valve to open for a second preset time and then closing.
As shown in fig. 15, a first battery cover plate corresponds to a # 1 battery, the first battery cover plate is connected to a first rough pumping valve and a first detection valve through a first vacuum valve, a second battery cover plate corresponds to a # 2 battery, the second battery cover plate is connected to a second rough pumping valve and a second detection valve through a second vacuum valve, a third battery cover plate corresponds to a # 3 battery, the third battery cover plate is connected to a third rough pumping valve and a third detection valve through a third vacuum valve, a fourth battery cover plate corresponds to a # 4 battery, the fourth battery cover plate is connected to a fourth rough pumping valve and a fourth detection valve through a fourth vacuum valve, a battery seal port is pressed for a certain time at a helium pressing station, a tray is transferred to the helium detection station, a seal shaft is pressed downwards for sealing, rough pumping valves (the first rough pumping valve to the fourth rough pumping valve) are opened at the same time at a plurality of battery stations, a third space is first evacuated to a certain pressure (e.g. 100pa) and then the rough pumping valve is closed, and opening vacuum valves (a first vacuum valve to a fourth vacuum valve) to enable the gas in the second space to enter the third space, and closing the vacuum valves after a certain time (such as 0.2 s). And (3) simultaneously opening rough-pumping valves at a plurality of battery stations, vacuumizing the first space to a certain pressure (such as 10 pa-20 pa), closing the vacuum valves, opening the vacuum valves, enabling the gas in the second space to enter the third space, and closing the vacuum valves after a long time (such as 10 s).
The technical effects of the embodiment are as follows: in the detection method, the multichannel helium detection stations are simultaneously vacuumized, and the time for helium in the first space and the second space (provided that leak holes are formed at the welding positions of the sealing nails) to leak to the third space can be controlled, so that the consistency of the flow time of the detection gas is ensured, and the accuracy of helium detection of each channel is ensured.
As an embodiment, sequentially controlling each detection valve in step S202 to enable the mass spectrometer to perform helium detection on each cell through each cell cover plate structure includes:
s221, controlling a first detection valve to open to enable a mechanical pump to carry out helium detection on a first battery in a first battery cover plate structure;
s222, when the helium detection result is qualified, closing the first detection valve and opening the next detection valve;
and S223, when the helium detection result is unqualified, closing the first detection valve, performing cavity cleaning treatment on the helium detection main pipeline and the first helium detection branch pipeline, and then opening the next detection valve.
As shown in fig. 15, a first detection valve of the 1# battery is opened to perform helium detection on the 1# battery, if the helium detection is qualified, the first detection valve is closed, a second detection valve of the 2# battery is opened, if the helium detection is unqualified, the cavity cleaning treatment is performed, the cavity cleaning is completed, and the second detection valve of the 2# battery is opened; and (4) until the helium tests of the 2# battery, the 3# battery and the 4# battery are completed.
This example is illustrated in detail by the following experimental data:
the test method comprises the following steps:
(5) the helium filling pressure of the helium pressing station is 4100-4200 mbar;
(6) the helium pressing time of the helium pressing station is 60 s;
(7) vacuum 1:10mbar (alarm value); vacuum 2:10mabr (alarm value);
(8) the time is 1:0.2 s; the time is 2:10 s;
(9) leak rate test time: 2 s;
(10) and (3) leakage rate evaluation standard: e-6 is less than or equal to 5.0; judging as OK; otherwise NG.
Experiment 1
The A # -F # samples were numbered and arranged as in Table S5-1-1 as follows:
TABLE S5-1
| Sample numbering | S5-1-1# | S5-1-2# | S5-1-3# | S5-1-4# | S5-1-5# | S5-1-6# |
| Corresponding sample | A# | B# | C# | D# | E# | F# |
| State of welding | OK | OK | OK | OK | OK | OK |
The helium detection test is carried out on the helium detector with 6 channels prepared by the invention, and each sample is tested repeatedly for 3 times: the test results are shown in the following Table S5-1-2:
TABLE S5-1-2
| Sample numbering | Channel number | Leak rate 1 | Leak rate 2 | Leak rate 3 | Positive pressure determination result | Determination result of back pressure |
| S5-1-1# | 1 | 3.20E-07 | 3.37E-07 | 3.44E-07 | OK | OK |
| S5-1-2# | 2 | 3.73E-07 | 3.80E-07 | 3.94E-07 | OK | OK |
| S5-1-3# | 3 | 6.73E-07 | 6.72E-07 | 6.84E-07 | OK | OK |
| S5-1-4# | 4 | 6.73E-07 | 6.60E-07 | 6.84E-07 | OK | OK |
| S5-1-5# | 5 | 5.43E-07 | 5.56E-07 | 5.60E-07 | OK | OK |
| S5-1-6# | 6 | 1.74E-07 | 1.81E-07 | 1.85E-07 | OK | OK |
Experiment 2
The G # -L # samples were made into the following alignment Table S5-2-1:
TABLE S5-2-1
| Sample numbering | S5-2-1# | S5-2-2# | S5-2-3# | S5-2-4# | S5-2-5# | S5-2-6# |
| Corresponding sample | G# | H# | I# | J# | K# | L# |
| State of welding | NG | NG | NG | NG | NG | NG |
The helium detection test is carried out on the helium detector with 6 channels prepared by the invention, and each sample is tested repeatedly for 3 times: the test results are given in the following Table S5-2-2:
TABLE S5-2
Experiment 3
The A # -L # samples were arranged in the following manner in Table S5-3-1:
TABLE S5-3-1
MSA (physical System Alasye) analysis was performed on a 6-channel helium analyzer, 3 times for each sample, and repeatability and uniformity tests were performed. The analysis results are shown in the following table S5-3-2:
TABLE S5-3-2
The helium detector for the channel sealing is improved by adopting the scheme of the invention, the MSA, GR and R of the helium detector reach 9.66 percent and are less than 10 percent, and the MSA test is excellent.
The results of the analysis of the data from Table 8 using the Mintab software are shown below in tables 5-5.
Tables 5 to 5
Comparative example
The helium detector is used: the hardware and original design adopt the original technology.
And similarly, detecting the leakage rate of the battery cover plate by adopting a 6-channel helium pressing station and a 6-channel helium detecting station, wherein the helium pressing station corresponds to the helium detecting station one by one.
The test method comprises the following steps:
(1) helium gas is filled at the pressure of 4100-4200 mbar;
(2) the helium pressing time of the helium pressing station is 120 s;
(3) and (3) leakage rate testing time: 2 s;
(4) and (3) leakage rate evaluation standard: less than or equal to 5.0E-6; judging as OK; otherwise NG.
Comparative example 1
Experiment 1
The A # -F # samples were arranged as follows in Table D1-1-1:
TABLE D1-1
| Sample numbering | D1-1-1# | D1-1-2# | D1-1-3# | D1-1-4# | D1-1-5# | D1-1-6# |
| Corresponding sample | A# | B# | C# | D# | E# | F# |
| State of welding | OK | OK | OK | OK | OK | OK |
The helium detection test is carried out on the helium detector with 6 channels prepared by the invention, and each sample is tested repeatedly for 3 times: the test results are shown in Table D1-1-2 below:
TABLE D1-1-2
Experiment 2
The G # -L # samples were arranged as follows in Table D1-2-1:
TABLE D1-2-1
| Sample numbering | D2-1 | D2-2 | D2-3 | D2-4 | D2-5 | D2-6 |
| Corresponding sample | G# | H# | I# | J# | K# | L# |
| State of welding | NG | NG | NG | NG | NG | NG |
The helium test was performed on a 6-channel helium detector prepared in comparative example, and the test was repeated 3 times for each sample: the test results are shown in Table D1-2-2 below:
TABLE D1-2
| Sample number | Channel number | Leak rate 1 | Leak rate 2 | Leak rate 3 | Positive pressure determination result | Determination result of back pressure |
| D1-2-1 | 1 | 1.80E-05 | 1.79E-05 | 2.14E-05 | NG | NG |
| D1-2-2 | 2 | 6.30E-05 | 6.29E-05 | 6.54E-05 | NG | NG |
| D1-2-3 | 3 | 3.02E-04 | 3.19E-04 | 3.44E-04 | NG | NG |
| D1-2-4 | 4 | 4.14E-05 | 4.25E-05 | 4.03E-05 | NG | NG |
| D1-2-5 | 5 | 4.14E-06 | 4.25E-06 | 4.43E-06 | NG | OK |
| D1-2-6 | 6 | 2.04E-07 | 2.65E-07 | 2.33E-07 | NG | OK |
In experiment 2, the sample numbers D1-2-5 and D1-2-6 are judged to be OK in back pressure, and actually the two samples are NG samples.
Comparative example 2
Experiment 1
And (3) testing a welding good sample, selecting samples A '# -F' #, and adopting all rubber nails in the prior art to be welding good samples (or light metal plates) as shown in a table D2-1-1:
TABLE D2-1
The helium test of example 5 was used and the results are shown in Table D2-1-2:
TABLE D2-1-2
| Sample numbering | Channel number | Leak rate 1 | Leak rate 2 | Leak rate 3 | Positive pressure determination result | Determination result of back pressure |
| A’# | 1 | 7.50E-08 | 7.27E-08 | 7.44E-08 | OK | OK |
| B’# | 2 | 4.73E-08 | 4.70E-08 | 4.64E-08 | OK | OK |
| C’# | 3 | 2.23E-08 | 2.20E-08 | 2.74E-08 | OK | OK |
| D’# | 4 | 3.03E-07 | 3.20E-07 | 3.34E-07 | OK | OK |
| E’# | 5 | 4.53E-08 | 4.42E-08 | 4.50E-08 | OK | OK |
| F’# | 6 | 1.16E-08 | 1.26E-08 | 1.26E-08 | OK | OK |
For the cover plate with good welding, no helium gas leaks into the rubber nail, so the detection value of the leak rate is basically close to the leak rate value of the cover plate of the rubber nail in the prior art. And the risk of misjudgment and missed judgment does not exist.
Experiment 2
And (3) testing a sample with poor welding, selecting samples G '# -L' #, and adopting all rubber nails in the prior art to be the samples (or light rubber nails) with poor welding, wherein the samples are shown in a table D2-2-1:
TABLE D2-2-1
The results of testing the leak rate of this batch of cover plates using the helium test of example 5 are given in Table D2-2-2 below:
TABLE D2-2
| Sample number | Channel number | Leak rate 1 | Leak rate 2 | Leak rate 3 | Positive pressure determination result | Determination result of back pressure |
| G’# | 1 | 9.94E-06 | 1.47E-05 | 1.83E-05 | NG | NG |
| H’# | 2 | 3.73E-05 | 3.50E-05 | 2.94E-04 | NG | NG |
| I’# | 3 | 2.10E-04 | 2.09E-04 | 1.94E-04 | NG | NG |
| J’# | 4 | 4.26E-05 | 4.15E-05 | 4.16E-05 | NG | NG |
| K’# | 5 | 7.86E-05 | 7.46E-05 | 7.93E-05 | NG | NG |
| L’# | 6 | 3.08E-06 | 3.44E-06 | 3.22E-06 | NG | NG |
It can be seen that the helium storage capacity of the rubber nail which is not improved is weaker than that of the rubber nail which is improved, the leak rate of the L' # sample is misjudged if the leak rate judgment standard for good welding is less than or equal to 5.0E-06, and is close to the judgment standard if the leak rate judgment standard for good welding is less than or equal to 2.0E-06, so that the risk of misjudgment is very high.
The foregoing is a more detailed description of the present application in connection with specific preferred embodiments and it is not intended that the present application be limited to these specific details. For a person skilled in the art to which the present application pertains, several equivalent alternatives or obvious modifications, all of which have the same properties or uses, without departing from the concept of the present application, shall be deemed to belong to the patent protection scope of the present application, as determined by the claims submitted.
Claims (13)
1. The utility model provides a battery cover plate structure, its characterized in that, battery cover plate structure includes apron, glue nail and sealed nail, sealed nail welding is in on annotating liquid counter bore step on the apron, glue nail with annotate liquid hole interference fit on the apron, the head of glue nail is equipped with the slot on the surface.
2. The battery cover plate structure of claim 1, wherein the groove has a shape of a straight line, a cross, a meter, or a circle, and the groove has a cross-sectional shape of a U, a V, or a square.
3. The battery cover plate structure of claim 2, wherein a width value of the groove belongs to [ 0.1mm, 0.5mm ], and a depth value of the groove belongs to [ 0.1mm, 0.5mm ].
4. The battery cover plate structure of claim 1, wherein a width of a protruding edge of the lower surface of the sealing nail is smaller than a width of a liquid injection counterbore step on the cover plate.
5. The battery cover plate structure of claim 4, wherein the inner circumference of the edge of the lower surface of the sealing nail protruding therefrom is chamfered.
6. A helium detector seals, characterized in that, helium detector seals includes mechanical pump, mass spectrograph, at least one sealed head, the mechanical pump is connected the main pipeline in vacuum, the main pipeline in vacuum and every sealed head are through a vacuum branch pipeline UNICOM, every sealed head presses a battery cover plate structure of any one of claims 1 to 5, be equipped with a rough pumping valve on every vacuum branch pipeline, the mass spectrograph examines a plurality of helium of main pipeline UNICOM through the helium and examines branch pipeline, is equipped with a detection valve on every helium examination branch pipeline, helium examines main pipeline UNICOM the main pipeline in vacuum, wherein, the vacuum branch pipeline with the UNICOM point that helium examined branch pipeline is located rough pumping valve with between the sealed head.
7. The helium detector as claimed in claim 6, wherein a vacuum valve is further provided in each vacuum branch line, said vacuum valve being located between said communication point and said battery cover plate structure.
8. A helium testing method for a sealed helium detector as claimed in claim 6, wherein the helium testing method comprises:
sequentially controlling each rough pumping valve to enable the mechanical pump to pump vacuum on each battery cover plate structure;
and sequentially controlling each detection valve to enable the mass spectrometer to carry out helium detection on each battery through each battery cover plate structure so as to obtain a helium detection result of each battery.
9. A helium testing method as claimed in claim 8, wherein said controlling each roughing valve in turn causes said mechanical pump to evacuate each cell cover plate structure, comprises:
controlling a first rough pumping valve to be opened so that the mechanical pump performs vacuum pumping on a first battery cover plate structure correspondingly connected with the first rough pumping valve;
when the pressure in a first vacuum branch pipe communicated with the first rough pumping valve is detected to reach a preset value, controlling the mechanical pump to stop vacuumizing, and closing the first rough pumping valve;
and after the first battery cover plate structure is vacuumized, sequentially controlling the opening and the closing of the residual rough vacuumizing valves until the last battery cover plate structure is vacuumized.
10. A helium testing method as claimed in claim 8 wherein controlling each test valve in turn to allow the mass spectrometer to perform helium testing on each cell through each cell cover plate structure comprises:
controlling a first detection valve to open to enable the mechanical pump to carry out helium detection on a first battery in a first battery cover plate structure;
when the helium detection result is qualified, closing the first detection valve and opening the next detection valve;
and when the helium detection result is unqualified, closing the first detection valve, performing cavity cleaning treatment on the helium detection main pipeline and the first helium detection branch pipeline, and then opening the next detection valve.
11. A helium testing method for a sealed helium detector as claimed in claim 7, wherein the helium testing method comprises:
controlling all rough pumping valves and all vacuum valves to simultaneously pump vacuum to all battery cover plate structures by a mechanical pump;
and sequentially controlling each detection valve to enable the mass spectrometer to carry out helium detection on each battery through each battery cover plate structure so as to obtain a helium detection result of each battery.
12. A helium testing method as claimed in claim 11 wherein said controlling all rough pumping valves and all vacuum valves to simultaneously pump vacuum to all battery cover plate structures comprises:
controlling all rough pumping valves to be opened simultaneously, and controlling all rough pumping valves to be closed simultaneously after the pressure values of the vacuum main pipeline and all vacuum branch pipelines communicated with the vacuum main pipeline are first preset pressure values;
controlling the vacuum valve to open for a first preset time and then closing;
controlling all rough pumping valves to be opened simultaneously, and controlling all rough pumping valves to be closed simultaneously after the pressure values of the vacuum main pipeline and all vacuum branch pipelines communicated with the vacuum main pipeline are second preset pressure values;
and controlling the vacuum valve to be opened for a second preset time and then to be closed.
13. A helium testing method according to claim 11 wherein the sequential control of each test valve causes the mass spectrometer to perform helium testing on each cell through each cell cover plate structure
Controlling a first detection valve to open to enable the mechanical pump to carry out helium detection on a first battery in a first battery cover plate structure;
when the helium detection result is qualified, closing the first detection valve and opening the next detection valve;
and when the helium detection result is unqualified, closing the first detection valve, performing cavity cleaning treatment on the helium detection main pipeline and the first helium detection branch pipeline, and then opening the next detection valve.
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