CN109935919B - Gas collecting device for battery - Google Patents
Gas collecting device for battery Download PDFInfo
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- CN109935919B CN109935919B CN201711375679.2A CN201711375679A CN109935919B CN 109935919 B CN109935919 B CN 109935919B CN 201711375679 A CN201711375679 A CN 201711375679A CN 109935919 B CN109935919 B CN 109935919B
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- 230000007246 mechanism Effects 0.000 claims abstract description 134
- 238000007789 sealing Methods 0.000 claims abstract description 16
- 210000001503 joint Anatomy 0.000 claims abstract description 8
- 239000000565 sealant Substances 0.000 claims abstract description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 12
- 229910052744 lithium Inorganic materials 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 11
- 229910000838 Al alloy Inorganic materials 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000007789 gas Substances 0.000 description 86
- 238000000034 method Methods 0.000 description 11
- 238000005553 drilling Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 239000003292 glue Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 239000008358 core component Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000032953 Device battery issue Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a gas collecting device for a battery, and relates to the field of batteries. The gas collection device includes: the positioning mechanism is arranged above the shell and extends upwards, the bottom surface of the positioning mechanism is completely attached to the top surface of the shell and hermetically sealed by sealant, and the positioning mechanism is hollow and communicated with the top surface of the shell; the fixing mechanism is arranged at the top of the positioning mechanism and is in airtight sealing butt joint with the positioning mechanism, and the fixing mechanism is configured to operably reciprocate up and down along the positioning mechanism; the miniature electric drill is arranged in the fixing mechanism and is configured to move along with the reciprocating movement of the fixing mechanism, and the miniature electric drill is provided with a drill bit extending into the positioning mechanism so as to break a shell of the battery through the drill bit when the miniature electric drill moves downwards and enable gas in the battery to overflow; and the gas collecting unit is communicated with the inside of the positioning mechanism through a pipeline and is used for collecting overflowed gas. Thereby collecting and detecting gas overflowing from the battery.
Description
Technical Field
The invention relates to the field of batteries, in particular to a gas collecting device for a battery.
Background
With the continuous development of science and technology, electrical automation has entered into the aspects of life, and batteries provide power for the batteries, which is more important, but after the batteries are used for a period of time, the batteries are easy to generate gas inside, and the collection and analysis of the gas are more important to eliminate the generation of the gas in the batteries. For the battery sealed by the stainless steel or/and aluminum alloy shell, the gas generated in the battery is difficult to collect due to the high hardness and strength of the shell. If the battery is in an irregular shape, such as a cylinder, the arc surface of the battery has the characteristic of strong resistance to external deformation, so that gas generated inside the battery can hardly be collected; in particular to a lithium battery wrapped by a stainless steel or/and aluminum alloy shell.
The lithium battery is the most commonly used battery, and gas is generated in the formation and use processes. Wherein the gas production phenomenon generated by consuming the electrolyte to form a stable SEI film in the process of battery formation is normal gas production. The abnormal gas generation mainly refers to the phenomena of excessive consumption of electrolyte to release gas or positive electrode material to release oxygen, and the like in the battery circulation process, which causes deformation, breaking of packaging materials, contact of internal battery cells and the like due to excessive internal pressure of the battery. The qualitative and quantitative analysis of the gas generated by the lithium battery is beneficial to researching the cause of internal gas generation and the factors causing battery failure. The method plays an important role in the failure analysis and performance improvement of the lithium battery.
Disclosure of Invention
The invention aims to provide a gas collecting device for a battery, which is used for collecting and detecting gas overflowing from the battery by drilling through a stainless steel or/and aluminum alloy shell hermetically wrapped outside the gas collecting device.
A further object of the present invention is to provide a gas collecting device in a battery, which has a simple structure and is convenient to operate, for a commonly used square lithium battery.
Another further object of the present invention is to protect the internal structure of the lithium battery while drilling through the lithium battery case, so as to perform accurate detection and analysis on the internal structure of the lithium battery.
In particular, the present invention provides a gas collection device for a battery hermetically sealed by a stainless steel or/and aluminum alloy housing, comprising:
the positioning mechanism is arranged above the shell and extends upwards, the bottom surface of the positioning mechanism is completely attached to the top surface of the shell and hermetically sealed by sealant, and the positioning mechanism is hollow and communicated with the top surface of the shell;
the fixing mechanism is arranged at the top of the positioning mechanism and is in airtight sealing butt joint with the positioning mechanism, and the fixing mechanism is configured to operably reciprocate up and down along the positioning mechanism;
the miniature electric drill is arranged in the fixing mechanism and is configured to move along with the reciprocating movement of the fixing mechanism, and the miniature electric drill is provided with a drill bit extending into the positioning mechanism so as to break the shell of the battery through the drill bit when the miniature electric drill moves downwards and enable gas in the battery to overflow; and
and the gas collecting unit is communicated with the inside of the positioning mechanism through a pipeline and is used for collecting the overflowed gas.
Further, mutually matched airtight threads are respectively formed at the positioning mechanism and the fixing mechanism so as to enable the fixing mechanism to be in airtight sealing butt joint with the positioning mechanism.
Further, the gas collecting unit comprises a closed container which is communicated with the positioning mechanism through a conduit so as to contain the gas flowing into the closed container;
the gas collection device further comprises a vacuumizing device, and the vacuumizing device is connected with the guide pipe so as to vacuumize the closed container, the inside of the positioning mechanism and the inside of the guide pipe.
Further, the closed container is communicated with the gas chromatograph, and a third on-off valve is installed at the communication position of the closed container;
the gas collection unit further comprises:
the three-way pipe is communicated with the guide pipe, the vacuumizing device and the closed container from a first end to a third end; and
the one-way valve is arranged between the three-way pipe and the guide pipe so that the gas can only flow to the closed container;
and a first switch valve is arranged at the communication part of the three-way pipe and the vacuumizing device, and a second switch valve is arranged at the communication part of the three-way pipe and the closed container.
Furthermore, a through cavity which enables the top of the positioning mechanism to be communicated with the top surface of the shell is formed inside the positioning mechanism,
the side wall of the positioning mechanism is provided with a circular truncated cone, the side wall of the circular truncated cone is a conical surface, the top surface of the circular truncated cone is provided with a through hole communicated with the through cavity, and the circular truncated cone is inserted into one end of the conduit and attached to the side wall of the conduit.
Further, the top surface of the shell is a plane which is horizontally arranged, and the bottom surface of the positioning mechanism is a plane.
Further, the shell of the battery is a square body.
Further, battery case is the cylinder that extends along the horizontal direction, the shell top surface is the arc surface, positioning mechanism's bottom surface is the arc surface.
Further, the drilling depth of the drill bit to the shell is 0.8mm to 1.2mm, the drill bit is a conical frosted drill bit, a hole-shaped part with the diameter of 0.5mm to 1mm is formed after the drill bit drills through the plane of the shell, and the hole-shaped part is sealed through a colored adhesive tape.
Further, the battery is a lithium battery.
The technical effects of the application are as follows:
because the bottom surface of the positioning mechanism is completely attached to the top surface of the battery shell, the positioning mechanism and the battery shell are accurately positioned, and the positioning mechanism and the battery shell are hermetically sealed by the sealant, so that overflowing gas can be prevented from diffusing to the outside of the positioning mechanism on one hand, and the positioning mechanism and the battery shell are kept fixed on the other hand. The miniature electric drill for drilling the shell is kept above the battery through the positioning mechanism and the fixing mechanism, and the fixing mechanism is configured to operably reciprocate up and down along the positioning mechanism, so that no matter what shape the battery shell is, the shell and the moving direction of the drill bit are kept fixed, and the drill bit is driven to drill the shell made of stainless steel or/and aluminum alloy.
In addition, the gas collecting device of this application simple structure, its core component is mainly positioning mechanism, fixed establishment and miniature electric drill, except the motor of miniature electric drill, do not use any sensing device to detect whether to bore the shell through, but utilize battery case, battery inner structure and drill bit in no-load stroke, hardness and intensity that the drill bit was experienced are different completely, and this kind of hardness and intensity are different can be received by gathering personnel's feeling through operation fixed establishment, judge whether the drill bit contacts with the shell then, and whether bore the shell broken. Therefore, the battery shell can be guaranteed to be drilled, and the cost is greatly reduced through a simple structure mode, so that the two purposes are achieved at one stroke.
Furthermore, because the bottom surface of the positioning mechanism is a plane, and all the outer surfaces of the square shell are planes, the positioning mechanism can be in contact with any position of any plane of the battery shell. Thus, when a certain plane of the shell is observed to be convex, and the plane needs to be drilled, the position plane can be drilled without any limitation. Thereby collecting the gas very conveniently.
Further, by virtue of the fact that the airtight thread has a self-locking angle, i.e. the thread can be rotated and the drill bit pushed downwards only if the force for screwing the thread is greater than its self-locking force. And in the rotating process, only the fixing mechanism can just rotate relative to the positioning mechanism, namely the rotating force of the fixing mechanism is just larger than or equal to the thrust corresponding to the self-locking angle of the airtight thread. Therefore, the self-locking force of whether the airtight thread is self-locked or not is taken as reference, the drilling force of the drill bit moving downwards can be completely controlled, and when the shell is about to be drilled through, the screwing force of the fixing mechanism is slowed down, so that the internal structure of the battery is not damaged.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic diagram of the construction of a gas collection device according to the present invention;
the reference numbers in the figures are:
1, a miniature electric drill, a 101 drill bit and a 102 motor;
2 battery, 201 housing;
3, a positioning mechanism, a 301 circular truncated cone and a 302 through cavity;
4, a fixing mechanism;
5, airtight thread;
6, a gas collection unit, a 601 closed container, a 602 guide pipe, a 603 three-way pipe, a 604 one-way valve, a 605 first switch valve, 606 second switch valve and 607 third switch valve;
7, a vacuum pumping device;
8 sealing glue.
Detailed Description
Referring to fig. 1, the gas collection device of the present application comprises: positioning mechanism 3, fixed establishment 4, miniature electric drill 1 and gas collection unit 6. Wherein, the battery 2 is hermetically sealed and wrapped by a stainless steel or/and aluminum alloy shell 201. The positioning mechanism 3 is arranged above the shell 201 and extends upwards, the bottom surface of the positioning mechanism 3 is completely attached to the top surface of the shell 201 and hermetically sealed by the sealant 8, and the positioning mechanism 3 is hollow and communicated with the top surface of the shell 201. The fixing mechanism 4 is arranged on the top of the positioning mechanism 3 and is in airtight sealing butt joint with the positioning mechanism 3, and the fixing mechanism 4 is configured to operably reciprocate up and down along the positioning mechanism 3. The mini electric drill 1 is disposed inside the fixing mechanism 4 and configured to move with the reciprocating movement of the fixing mechanism 4, and the mini electric drill 1 has a drill bit 101 extending into the positioning mechanism 3 to drill through a casing 201 of the battery 2 by the drill bit 101 when the mini electric drill 1 moves downward, thereby allowing gas in the battery 2 to escape. The gas collection unit 6 communicates with the inside of the positioning mechanism 3 through a pipe for collecting the overflowed gas.
The application process of the gas collecting device can be that firstly, the bottom surface of the positioning mechanism 3 is completely attached to the top surface of the battery 2 shell 201, then the positioning mechanism 3 is hermetically and hermetically butted with the top surface of the battery 2 shell 201 by using the sealant 8, then the fixing mechanism 4 is operated by a collector, the fixing mechanism 4 moves downwards, so as to drive the micro electric drill 1 arranged inside the fixing mechanism 4 to move, when the drill bit 101 is in contact with the surface of the shell 201, the collector feels that the moving speed of the drill bit 101 is reduced by operating the fixing mechanism 4, then the fixing mechanism 4 is continuously operated, the drill bit 101 below the micro electric drill 1 moves downwards and breaks the shell 201, so that the gas in the battery 2 overflows, then the gas enters the gas collecting unit 6, when the shell 201 is drilled, because the hardness of the battery 2 structure in the shell 201 is different from the hardness of the shell 201, so that the moving speed of the drill 101 is changed and felt by the harvester by operating the fixing mechanism 4. At this time, the inspector stops operating the fixing mechanism 4, or moves the fixing mechanism 4 upward to detach the drill 101 from the housing 201, and the gas collecting process is finished.
Because the bottom surface of the positioning mechanism 3 is completely attached to the top surface of the battery 2 shell 201, the positioning mechanism 3 and the battery 2 shell 201 are accurately positioned, and the sealing glue 8 is used for airtight sealing, so that on one hand, overflowed gas can be prevented from diffusing to the outside of the positioning mechanism 3, and on the other hand, the positioning mechanism 3 and the battery 2 shell 201 are kept fixed. The miniature electric drill 1 for drilling the casing 201 is held above the battery 2 through the positioning mechanism 3 and the fixing mechanism 4, and the fixing mechanism 4 is configured to operably reciprocate up and down along the positioning mechanism 3, so that no matter what the shape of the casing 201 of the battery 2 is, the casing 201 and the moving direction of the drill bit 101 are kept fixed, and the drill bit 101 is driven to drill the casing 201 made of stainless steel or/and aluminum alloy.
In addition, the gas collecting device is simple in structure, core components of the gas collecting device are mainly the positioning mechanism 3, the fixing mechanism 4 and the micro electric drill 1, except for the motor 102 of the micro electric drill 1, no sensing device is used for detecting whether the shell 201 is drilled through, the shell 201 of the battery 2, the inner structure of the battery 2 and the drill bit 101 are used in no-load travel, hardness and strength sensed by the drill bit 101 are completely different, the hardness and strength are different, the hand feeling of a person who can be collected can be received through operation of the fixing mechanism 4, and then whether the drill bit 101 is in contact with the shell 201 or not is judged, and whether the shell 201 is drilled through or not is judged. Therefore, the battery 2 shell 201 can be guaranteed to be drilled, and the cost is greatly reduced through a simple structure mode, so that two purposes are achieved at one stroke.
The sealing glue 8 may be a solid glue.
Referring to fig. 1, further, the battery 2 may be a lithium battery 2.
Referring to fig. 1, in particular, mutually cooperating airtight threads 5 are formed at the positioning means 3 and at the fixing means 4, respectively, to hermetically seal-interface the fixing means 4 with the positioning means 3. At the same time, the securing mechanism 4 is configured to operably reciprocate up and down the boss by rotating the securing mechanism 4 relative to the boss. With regard to the airtight thread 5, it is known to refer to the patent CN 97106725.2.
It should be noted that, although the fixing mechanism 4 may be configured to operatively reciprocate up and down along the protruding portion, for example, using a matching form of a sliding groove and a sliding rail, the inventor finds that, because the housing 201 and the internal structure of the battery 2 are not the same substance, but the substance in the battery 2 is usually much lower than the hardness and the strength of the housing 201, at the moment when the drill 101 drills through the housing 201, the resistance force applied to the drill 101 is instantaneously reduced, so that the balance between the operation force of the hand of the person and the resistance force is broken, so that the operation force is instantaneously increased, according to newton's law, the acceleration of the drill 101 reaches infinity, so that the drill 101 can seriously damage the internal structure of the battery 2, which greatly affects the subsequent detection of the internal structure of the battery 2. If a small operation force is used to ensure that the internal structure of the battery 2 is not destroyed, the drill 101 cannot be caused to pierce the casing 201, or it takes a long time. Therefore, it is difficult to drill the case 201 without damaging the structure of the lithium battery 2 in the case 201.
For this reason, the inventor utilized the feature that the airtight thread 5 has a self-locking angle, that is, only when the force of screwing the airtight thread 5 is greater than its self-locking force, the airtight thread 5 can be rotated and push the drill bit 101 to move downward. During the rotation process, the fixing mechanism 4 can just rotate relative to the positioning mechanism 3, namely the rotating force is just larger than or equal to the pushing force corresponding to the self-locking angle of the airtight thread 5. Thus, with reference to the self-locking force of whether the airtight thread 5 is self-locked or not, the magnitude of the drilling force of the downward movement of the drill 101 can be completely controlled, and when the casing 201 is about to be drilled through, the screwing force on the fixing mechanism 4 is slowed down, so that the internal structure of the battery 2 is not damaged.
Referring to fig. 1, further, the gas collection unit 6 includes a closed container 601, and the closed container 601 is communicated with the positioning mechanism 3 by a conduit 602 to contain the gas flowing therein. The gas collecting device further comprises a vacuum pumping device 7, wherein the vacuum pumping device 7 is connected with the conduit 602 so as to vacuum the closed container 601, the inside of the positioning mechanism 3 and the inside of the conduit 602.
In addition, the positioning mechanism 3 partially seals the designated area of the top surface of the shell 201, so that the sealing range is small, and the vacuumized gas is less, thereby not only reducing the loss of the vacuumizing device, but also improving the vacuumizing speed. Moreover, the sealing range is small, and the leakage range is smaller compared with that of a large-range airtight sealing, so that the airtightness of the whole airtight system is ensured.
The vacuum-pumping means 7 may be a vacuum pump.
The gas collecting device of the present application is configured by the airtight container 601, the inside of the positioning mechanism 3 and the duct 602 to form an airtight sealing system, so that on one hand, the gas in the battery 2 is prevented from being mixed with other gases in the air when the gas is collected, and on the other hand, the gas overflowing from the battery 2 is prevented from being diffused in the air, so that the gas collecting amount is greatly reduced.
Because the gas collecting device of the application can firstly use the vacuumizing device 7 to vacuumize the inside of the closed container 601, the positioning mechanism 3 and the conduit 602 before the drill bit 101 moves downwards, on one hand, other gas impurities in a gas-tight sealing system formed by the inside of the closed container 601, the positioning mechanism 3 and the conduit 602 can be eliminated, and the purity of the obtained gas is ensured; on the other hand, the inside of the sealed container 601, the positioning mechanism 3 and the conduit 602 are vacuumized, and the battery 2 contains gas, so that the gas pressure in the casing 201 is greater than the gas pressure outside the casing 201, and when the drill 101 breaks the casing 201, the gas in the casing 201 enters the sealed container 601 as completely as possible under the action of the gas pressure difference, so that the gas quantity is collected as much as possible.
Referring to fig. 1, further, the closed vessel 601 is in communication with a gas chromatograph (not shown in the figure), and a third on/off valve 607 is installed in the communication. The gas collection unit 6 further includes: a tee 603 and a check valve 604. The tee pipe 603 has first to third ends communicating with each other, and communicates with the conduit 602, the vacuum extractor 7, and the closed vessel 601, respectively. A check valve 604 is installed between the tee 603 and the conduit 602 so that gas can only flow to the closed vessel 601. Wherein, a first switch valve 605 is arranged at the communication position of the three-way pipe 603 and the vacuum extractor 7, and a second switch valve 606 is arranged at the communication position of the three-way pipe 603 and the closed container 601.
Before the gas is collected, a first switch valve 605 at the connection part of the three-way pipe 603 and the vacuumizing device 7 is opened, the gas in the gas collecting device is pumped out, and then the first switch valve 605 is closed. And starting the miniature electric drill 1, slowly rotating the fixing device of the miniature electric drill 1 until the drill bit 101 contacts the surface of the battery 2 of the shell 201, and continuously and slowly rotating the fixing mechanism 4 until the surface of the shell 201 is damaged and gas overflows. The internal gas pressure of the battery 2 is greater than that of the gas collecting device, gas flows out of the battery 2 and flows into the closed container 601 through the conduit 602, and the one-way valve 604 prevents the gas from flowing back, so that the gas in the battery 2 can be completely collected. In this way, before the gas is collected, all the components including the closed vessel 601 are subjected to an impurity evacuation process to further ensure the purity of the obtained gas.
In addition, the closed vessel 601 is connected to the gas chromatograph so that the collected gas can be analyzed, and the gas is introduced into the gas chromatograph by opening and closing the third switching valve 607.
Referring to fig. 1, further, the inside of the positioning mechanism 3 is formed with a through cavity 302 that communicates the top of the positioning mechanism 3 with the top surface of the housing 201. A circular truncated cone 301 is formed on the side wall of the positioning mechanism 3, the side wall of the circular truncated cone 301 is a conical surface, a through hole communicated with the through cavity 302 is formed on the top surface of the circular truncated cone 301, and the circular truncated cone 301 is inserted into one end of the conduit 602 and attached to the side wall of the conduit.
The circular truncated cone 301 is a plane parallel to the bottom surface of the cone to cut the cone, the portion between the bottom surface and the cross section is called the circular truncated cone 301, and the circular truncated cone 301 has a shaft, a bottom surface, side surfaces and generatrices as well as a cylinder and a cone.
Due to the structural characteristics of the circular truncated cone 301, the side wall of the circular truncated cone is conical, so that the circular truncated cone has good insertion guidance. And its bottom diameter is bigger, can form interference fit with pipe 602 inner wall to guarantee sealed butt joint, make in the gaseous collection system in-process of assembling this application, only need insert the one end of pipe 602 with round platform 301, just realize the sealed butt joint of pipe 602 and bellying fast.
Referring to fig. 1, further, the top surface of the housing 201 is a horizontally disposed plane, and the bottom surface of the positioning mechanism 3 is a plane.
The housing 201 may be a square housing or a housing with one side being curved and the other side being flat, where one side is opposite the other. The drill 101 is perpendicular to the plane, so that the drill 101 can be prevented from shifting in the drilling process, and the drill 101 can smoothly drill the shell 201 of the battery 2.
Referring to fig. 1, further, the housing 201 of the battery 2 is a square body. Since the bottom surface of the positioning mechanism 3 is a plane and all the outer surfaces of the square housing are flat, the positioning mechanism 3 can be in contact with any position of any one flat surface of the housing 201 of the battery 2. Thus, when a plane of the housing 201 is observed to be convex, and the plane needs to be drilled, the plane can be drilled. Without being limited in any way. Thereby collecting gas very conveniently.
Referring to fig. 1, the housing 201 of the battery 2 is a cylinder extending along the horizontal direction, the top surface of the housing 201 is an arc surface, and the bottom surface of the positioning mechanism 3 is an arc surface. The gas collection device of the present application only needs to hermetically seal a local area of the surface of the housing 201 of the battery 2, so that less gas is evacuated and the vacuum is formed more quickly.
Referring to fig. 1, further, the drilling depth of the casing 201 by the drill 101 is 0.8mm to 1.2mm, the drill 101 is a cone-shaped sand drill 101, and after the drill 101 drills through the plane of the casing 201, a hole-shaped part with a diameter of 0.5mm to 1mm is formed, and the hole-shaped part is sealed by a colored adhesive tape. Preferably, the colored tape is a yellow tape.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (9)
1. A gas collection device for a battery hermetically sealed by a stainless steel or/and aluminum alloy housing, comprising:
the positioning mechanism is arranged above the shell and extends upwards, the bottom surface of the positioning mechanism is completely attached to the top surface of the shell and carries out local airtight sealing on a designated area of the top surface of the shell through sealant, and the positioning mechanism is hollow and communicated with the top surface of the shell;
the fixing mechanism is arranged at the top of the positioning mechanism and is in airtight sealing butt joint with the positioning mechanism, and the fixing mechanism is configured to operably reciprocate up and down along the positioning mechanism;
the miniature electric drill is arranged in the fixing mechanism and is configured to move along with the reciprocating movement of the fixing mechanism, and the miniature electric drill is provided with a drill bit extending into the positioning mechanism so as to break the shell of the battery through the drill bit when the miniature electric drill moves downwards and enable gas in the battery to overflow; and
the gas collecting unit is communicated with the inside of the positioning mechanism through a pipeline and is used for collecting the overflowed gas;
mutually-matched airtight threads are respectively formed at the positioning mechanism and the fixing mechanism so as to enable the fixing mechanism to be in airtight sealing butt joint with the positioning mechanism and allow the fixing mechanism to reciprocate up and down along the positioning mechanism by being screwed to rotate relative to the positioning mechanism.
2. The gas collection device of claim 1, wherein the gas collection unit comprises a sealed container, the sealed container being in communication with the positioning mechanism via a conduit to contain the gas flowing therein;
the gas collection device further comprises a vacuumizing device, and the vacuumizing device is connected with the guide pipe so as to vacuumize the closed container, the inside of the positioning mechanism and the inside of the guide pipe.
3. The gas collection device of claim 2,
the closed container is communicated with the gas chromatograph, and a third on-off valve is arranged at the communication position of the closed container and the gas chromatograph;
the gas collection unit further comprises:
the three-way pipe is communicated with the guide pipe, the vacuumizing device and the closed container from a first end to a third end; and
the one-way valve is arranged between the three-way pipe and the guide pipe so that the gas can only flow to the closed container;
and a first switch valve is arranged at the communication part of the three-way pipe and the vacuumizing device, and a second switch valve is arranged at the communication part of the three-way pipe and the closed container.
4. The gas collection device of claim 3,
a through cavity which enables the top of the positioning mechanism to be communicated with the top surface of the shell is formed inside the positioning mechanism,
the side wall of the positioning mechanism is provided with a circular truncated cone, the side wall of the circular truncated cone is a conical surface, the top surface of the circular truncated cone is provided with a through hole communicated with the through cavity, and the circular truncated cone is inserted into one end of the conduit and attached to the side wall of the conduit.
5. The gas collection device of claim 1, wherein the top surface of the housing is a horizontally disposed planar surface and the bottom surface of the positioning mechanism is a planar surface.
6. The gas collection device of claim 5, wherein the housing of the battery is square.
7. The gas collection device of claim 1, wherein the battery housing is a cylinder extending in a horizontal direction, the top surface of the housing is a circular arc surface, and the bottom surface of the positioning mechanism is a circular arc surface.
8. The gas collection device of any one of claims 1 to 6, wherein the drill bit drills the housing to a depth of 0.8mm to 1.2mm, the drill bit is a cone-shaped abrasive drill bit, and after the drill bit drills through the flat surface of the housing, a hole of 0.5mm to 1mm diameter is formed, and the hole is sealed by a colored tape.
9. The gas collection device of any one of claims 1 to 6, wherein the battery is a lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711375679.2A CN109935919B (en) | 2017-12-19 | 2017-12-19 | Gas collecting device for battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711375679.2A CN109935919B (en) | 2017-12-19 | 2017-12-19 | Gas collecting device for battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109935919A CN109935919A (en) | 2019-06-25 |
| CN109935919B true CN109935919B (en) | 2022-05-17 |
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Family Applications (1)
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| CN109932222B (en) * | 2017-12-19 | 2022-09-27 | 中国科学院物理研究所 | Gas collecting device for collecting gas in battery |
| KR102397315B1 (en) * | 2019-05-07 | 2022-05-11 | 주식회사 엘지에너지솔루션 | Apparatus for collecting secondary cell internal gas |
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