CN110779592A - Gas production rate detection device and detection method for cylindrical battery - Google Patents
Gas production rate detection device and detection method for cylindrical battery Download PDFInfo
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- CN110779592A CN110779592A CN201911101470.6A CN201911101470A CN110779592A CN 110779592 A CN110779592 A CN 110779592A CN 201911101470 A CN201911101470 A CN 201911101470A CN 110779592 A CN110779592 A CN 110779592A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F19/00—Calibrated capacity measures for fluids or fluent solid material, e.g. measuring cups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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Abstract
The invention discloses a cylindrical battery gas production detection device and a cylindrical battery gas production detection method, which are characterized by comprising a top cover, a sleeve, a base, a bolt, a first connecting hose and a gas measuring device, wherein two ends of the sleeve are respectively connected with a lower plane of the top cover and an upper plane of the base in a sealing manner, the top cover and the base are fixedly connected through the bolt and a nut, an outwardly extending positive auxiliary tab integrally connected with the top cover is arranged on the outer side surface of the top cover, an outwardly extending negative auxiliary tab integrally connected with the base is arranged on the outer side surface of the base, the positive auxiliary tab and the negative auxiliary tab are respectively connected with corresponding interfaces of a charging and discharging device, a ventilating connecting pipe is also arranged on the top cover, the upper end of the ventilating connecting pipe is in sealing communication with a gas inlet pipe of the gas measuring device through the first connecting hose. The detection device has simple structure, can monitor the gas production conditions of the battery in different periods in real time during charging and discharging or in the using process of the battery, and has intuitive and convenient detection and high detection precision.
Description
Technical Field
The invention relates to the technical field of battery detection, in particular to a device and a method for detecting gas production of a cylindrical battery.
Background
With the development of new energy industry, people have higher and higher requirements on the cycle life, energy density, high and low temperature performance, safety and the like of batteries. The safety is crucial, and in the production process of the lithium ion battery, gas is generated in the formation stage or the later cycle use stage of the battery, and the amount of the generated gas is an important factor influencing the use or safety of the battery.
The laminate polymer battery can have a process of exhausting and sealing after formation is finished, so that the probability of safety problems caused by pressure increase due to gas increase is reduced, and on the premise that the cylindrical battery is not exhausted and sealed, how to realize safety under the premise of the limited service life of the battery is a problem to be solved urgently, so that the condition of the gas production of the battery in the formation process or in the use process is one direction for research of battery industry practitioners.
There are some devices for detecting the gas production of the battery in the related art, but the following two defects are common: firstly, the structure is complex, the mould is difficult to manufacture, and the operation is inconvenient; secondly, the gas change condition in the battery charging and discharging process cannot be monitored in real time.
Disclosure of Invention
The invention aims to provide a device capable of detecting the gas production condition of a battery in the processes of standing, charging and discharging of the battery aiming at the defects of the conventional device for detecting the gas production of the battery, and particularly relates to a simple, intuitive, efficient and accurate in-situ detection device for the gas production of the battery. Provides a powerful tool for safety evaluation of lithium ion batteries such as high nickel power batteries, lithium sulfur batteries and the like and other metal secondary or primary batteries and modification research and development work of battery materials.
The technical scheme of the invention is realized as follows:
the invention provides a cylindrical battery gas production detection device which is characterized by comprising a top cover, a sleeve, a base, a bolt, a first connecting hose and a gas measuring device, wherein a plurality of first mounting holes are formed in the periphery of the top cover, a plurality of second mounting holes are formed in the periphery of the base, the number of the first mounting holes is consistent with that of the second mounting holes, the first mounting holes and the second mounting holes are in one-to-one correspondence, the top cover and the base are made of stainless steel materials, the sleeve is a hollow cylindrical barrel with openings at two ends and made of polyethylene/polytetrafluoroethylene/engineering plastics, two ends of the sleeve are respectively connected with a lower plane of the top cover and an upper plane of the base, sealing devices are arranged at the connection positions of the sleeve, the lower plane of the top cover and the upper plane of the base, the top cover and the base penetrate through the first mounting holes and the second mounting holes through the bolt, nuts are sleeved at the end parts and, the outer side surface of the top cover is provided with an outwardly extending positive auxiliary tab which is connected with the top cover into a whole, the outer side surface of the base is provided with an outwardly extending negative auxiliary tab which is connected with the base into a whole, when the battery winding core is in work, a battery winding core which is welded with the tab but does not encapsulate a shell is placed in the sleeve, the positive tab is arranged on the upper part, the negative tab is arranged on the lower part, tabs at two ends of the battery are respectively bent by the top cover and the base and pressed in the sleeve, the top cover is electrically conducted with the positive tab of the battery, the base is electrically conducted with the negative tab of the battery, the positive auxiliary tab on the top cover becomes an external positive electrode of a cylindrical battery to be measured, the negative auxiliary tab on the base becomes an external negative electrode of the cylindrical battery to be measured, the positive auxiliary tab and the negative auxiliary tab are respectively connected with corresponding interfaces of a charging and discharging device, the top cover is also provided with a ventilation connecting pipe which is communicated with, and a throttle valve is arranged at the connecting end of the first connecting hose and the ventilating connecting pipe.
Further, the top cap is the cake form, and lower bottom surface is equipped with the counter bore one coaxial with the top cap excircle, fixedly connected with and the coaxial utmost point ear clamp plate of top cap excircle in the middle of the counter bore one, utmost point ear clamp plate adopts stainless steel, be equipped with the sealing washer along the inside wall in the counter bore one, on the downside of sealing washer in the counter bore one was located to sleeve upper end cover, during operation, the anodal ear of battery was buckled by utmost point ear clamp plate and is compressed tightly in the sleeve.
Further, the base is in a cake shape, a second counter bore coaxial with the outer circle of the base is formed in the upper plane, a tab pressing plate coaxial with the outer circle of the base is arranged in the middle of the second counter bore, the tab pressing plate is made of stainless steel, a sealing ring is arranged in the second counter bore along the inner side wall, the lower end of the sleeve is sleeved on the upper side face of the second counter bore inner sealing ring, and the battery negative electrode tab is pressed and bent by the tab pressing plate and is pressed in the sleeve during operation.
Furthermore, the first connecting hose is a transparent rubber hose, so that the air outlet condition can be observed conveniently.
Further, the gas measuring device includes discharge, buret, coupling hose two, takes into tracheal rubber buffer, buret and collecting hose all adopt general type buret, two both ends of coupling hose communicate into U type pipe with the bottom of discharge and buret is sealed respectively, take into tracheal rubber stopper stifled and locate the discharge upper end, the other end of intake pipe and coupling hose one is sealed to be communicated, buret upper end opening communicates with each other with the air.
Further, the gas measuring device comprises a gas collecting bottle and a measuring cylinder, dimethyl carbonate liquid is injected into the gas collecting bottle, a gas collecting bottle opening is sealed by a rubber plug, a gas inlet pipe and a liquid outlet pipe are arranged on the rubber plug, the upper end of the gas inlet pipe is connected with a ventilating connection pipe on a top cover through a first connecting hose in a sealing mode, the lower end of the gas inlet pipe is arranged above the liquid level, the liquid outlet pipe is an inverted U-shaped pipe, one end of the liquid outlet pipe is inserted into the bottom of the gas collecting bottle, a gap is reserved near the bottom surface of the gas collecting bottle, the other end of the.
The invention also provides a detection method of the cylindrical battery gas production amount detection device of any one of claims 1 to 5, which is characterized in that: the steps of the method for detecting the gas production of the cylindrical battery are as follows,
firstly, a battery roll core is sleeved into a sleeve, then a positive electrode lug and a negative electrode lug of the battery roll core are respectively bent and respectively connected with the lower side surface of a top cover/the lower side surface of a tab pressing plate on the top cover and the upper side surface of a base/the upper side surface of the tab pressing plate on the base, and two ends of the sleeve are respectively connected with the top cover and the base through sealing rings;
secondly, a bolt sequentially penetrates through the insulating washer, the mounting hole I of the top cover, the mounting hole II of the base and the insulating washer from bottom to top, and a nut is sleeved at the end part of the bolt and screwed down;
thirdly, injecting electrolytic liquid into the sleeve from the vent connecting pipe;
fourthly, injecting dimethyl carbonate liquid into a gas collecting pipe/a gas collecting bottle of the gas measuring device;
fifthly, communicating the first connecting hose with the air inlet pipe of the air measuring device through the vent connecting pipe and closing the throttle valve;
sixthly, placing the cylindrical battery gas production amount detection device into a charging and discharging device, respectively connecting a positive electrode and a negative electrode with corresponding interfaces of the charging and discharging device, moving the measuring tube/measuring cylinder up and down to enable the liquid level in the gas collecting tube/gas collecting bottle and the liquid level in the measuring tube/measuring cylinder to be at the same horizontal position, recording the initial liquid level V0 of the liquid in the measuring tube/measuring cylinder, opening a throttle valve, and starting to perform charging and discharging tests on the battery;
and seventhly, observing the scale change condition in the measuring cylinder, when acquiring the gas output data of the battery, closing the throttle valve, moving the position of the measuring tube/measuring cylinder up and down to enable the liquid in the measuring tube/measuring cylinder and the liquid level in the gas collecting tube/gas collecting bottle to be at the same horizontal position again, recording the position V1 of the liquid level in the measuring tube/measuring cylinder, opening the throttle valve to continue charging and discharging, and repeating the step seven when the next acquisition time is reached, wherein the gas output in the actual use of the battery can be detected in real time through the cyclic detection.
Further, in the third step, 5-10 g of electrolytic liquid is injected into the sleeve.
Compared with the prior art, the invention has the beneficial effects that: 1) the detection device has simple structure, can monitor the gas production conditions of the battery in different periods in real time during charging and discharging or in the using process of the battery, and has intuitive and convenient detection and high detection precision.
2) The top cover, the base and the lug pressing plate of the detection device are made of stainless steel materials, have small deformation, are resistant to electrolyte corrosion, can be repeatedly utilized, have long service life, can be conductive and can be electrically communicated with the lugs of the battery, so that the positive pole and the negative pole of the battery are led out from the auxiliary lugs of the top cover and the base;
3) the sleeve of the detection device adopts polyethylene/polytetrafluoroethylene/engineering plastics, is insulated and resists electrolyte corrosion;
4) the first connecting hose adopts a transparent rubber hose, so that the air outlet condition can be conveniently observed;
5) the sealing rings are arranged at the joints of the sleeve, the top cover and the base are screwed down through bolts, the sealing performance is good, and the detection precision is high;
6) the joints of the bolt, the top cover and the base are provided with the insulating washers, so that the short circuit of the positive electrode and the negative electrode of the battery can be prevented.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a top cover structure according to an embodiment of the present invention;
FIG. 3 is a schematic view of a base structure according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second embodiment of the present invention.
In the figure: 1. the device comprises a top cover, 101, counter bores, 102, positive auxiliary tabs, 103, mounting holes I, 104, a ventilation connecting pipe, 2, a sleeve, 3, a base, 301, counter bores, 302, negative auxiliary tabs, 303, mounting holes II, 4, bolts, 5, an insulating washer, 6, nuts, 7, a connecting hose I, 8, a throttle valve, 9, a rubber plug with an air inlet pipe, 10, an air collecting pipe, 11, a burette, 12, a connecting hose II, 13, a sealing ring, 14, tab pressing plates, 15, an air inlet pipe, 16, a rubber plug, 17, an air collecting bottle, 18, a liquid outlet pipe, 19 and a measuring cylinder.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 3, an embodiment of the present invention includes a top cover 1, a sleeve 2, a base 3, a bolt 4, a first connection hose 7, and an air measuring device.
The top cover 1 is in a round cake shape, a counter bore I101 coaxial with the excircle of the top cover 1 is arranged on the lower bottom surface, a tab pressing plate 14 coaxial with the excircle of the top cover 1 is fixedly connected in the middle of the counter bore I101, the top cover 1 and the tab pressing plate 14 are both made of stainless steel, a sealing ring 13 is arranged along the inner side wall in the counter bore I101, three mounting holes I103 are arranged on the periphery of the top cover 1, a positive auxiliary tab 102 extending outwards and connected with the top cover 1 into a whole is arranged on the outer side surface of the top cover 1,
the base 3 is in a round cake shape, a counter bore II 301 which is coaxial with the excircle of the base 3 is arranged on the upper plane, a tab pressing plate 14 which is coaxial with the excircle of the base 3 is arranged in the middle of the counter bore II 301, the base 3 and the tab pressing plate 14 are both made of stainless steel, a sealing ring 13 is arranged along the inner side wall in the counter bore II 301, three mounting holes II 303 are arranged on the periphery of the base 3, the positions of the mounting holes II correspond to the mounting holes I103 one by one up and down, a negative auxiliary tab 302 which extends outwards and is connected with the base 3 into a whole is arranged on the outer side,
the sleeve 2 is a hollow cylindrical tube with openings at two ends, polyethylene/polytetrafluoroethylene/engineering plastics are adopted, the upper end of the sleeve 2 is sleeved on the lower side surface of the sealing ring 13 in the first counter bore 101, and the lower end of the sleeve 2 is sleeved on the upper side surface of the sealing ring 13 in the second counter bore 301.
The gas measuring device comprises a gas collecting pipe 10, a measuring pipe 11, a second connecting hose 12 and a rubber plug 9 with a gas inlet pipe, wherein the measuring pipe 11 and the gas collecting pipe 10 are all universal burettes, two ends of the second connecting hose 12 are respectively communicated with the bottoms of the gas collecting pipe 10 and the measuring pipe 11 in a sealing mode to form a U-shaped pipe, the rubber plug 9 with the gas inlet pipe is arranged at the upper end of the gas collecting pipe 10 in a blocking mode, and the opening at the upper end of the measuring pipe 11 is communicated with air.
The top cover 1 is further provided with a ventilation connecting pipe 104, the ventilation connecting pipe 104 is communicated with the interior of the sleeve 2, the upper end of the ventilation connecting pipe 104 is communicated with an air inlet pipe on the rubber plug 9 in a sealing mode through a first connecting hose 7, a throttle valve 8 is arranged at the connecting end of the first connecting hose 7 and the ventilation connecting pipe 104, and the first connecting hose adopts a transparent rubber hose, so that the air outlet condition can be observed conveniently.
During operation, the battery that has welded utmost point ear but does not encapsulate the shell rolls up and places in sleeve 2, anodal ear is last, the negative pole ear is under, the anodal ear of battery is bent and is compressed tightly in sleeve 2 by utmost point ear clamp plate 14 on top cap 1, the battery negative pole ear is bent and is compressed tightly in sleeve 2 by utmost point ear clamp plate 14 on the base 3, top cap 1, sleeve 2, base 3 passes mounting hole one 103 and mounting hole two 303 through bolt 4, the nut 6 fastening connection is established to the tip cover, bolt 4 and top cap 1, base 3 is connected face department and all is equipped with insulating washer 5.
Because the upper and lower tab pressing plates 14 are electrically connected with the battery, the top cover 1 is electrically connected with the positive tab of the battery, the base 3 is electrically connected with the negative tab of the battery, the positive auxiliary tab 102 on the top cover 1 becomes the external positive electrode of the cylindrical battery to be tested, the negative auxiliary tab on the base 3 becomes the external negative electrode of the cylindrical battery to be tested, and the external positive electrode and the external negative electrode are respectively connected with corresponding interfaces of a charging and discharging device (not shown in the figure).
The air output of two groups of batteries (model 18650 and 2600) is detected by adopting the first embodiment of the invention, wherein the first group of batteries are numbered 1-1, 1-2 and 1-3, and the second group of batteries are numbered 2-1, 2-2 and 2-3, and the detection steps are as follows:
firstly, a battery roll core is sleeved into a sleeve 2, then a positive electrode tab and a negative electrode tab of the battery roll core are respectively bent and respectively connected with the lower side surface of a tab pressing plate 14 on a top cover 1 and the upper side surface of the tab pressing plate 14 on a base 3, and two ends of the sleeve 2 are respectively connected with the top cover 1 and the base 3 through a sealing ring 13;
secondly, sequentially penetrating a bolt 4 through an insulating washer 5, a first mounting hole 103 of the top cover 1, a second mounting hole 303 of the base 3 and the insulating washer 5 from bottom to top, and sleeving a nut 6 at the end part to be screwed tightly;
thirdly, 5.1g of electrolytic liquid is injected into the sleeve 2 from the vent connecting pipe 104;
fourthly, injecting dimethyl carbonate (DMC) liquid into a gas collecting pipe 10 of the vector gas device;
fifthly, the first connecting hose 7 is used for hermetically communicating the vent connecting pipe 104 with an air inlet pipe on the rubber plug 9, and the throttle valve 8 is closed;
sixthly, placing the cylindrical battery gas production detection device into a charging and discharging device, respectively connecting the positive auxiliary tab 102 and the negative auxiliary tab 302 with corresponding interfaces of the charging and discharging device, moving the metering tube 11 up and down to enable the liquid level in the gas collecting tube 10 and the liquid level in the metering tube 11 to be at the same horizontal position, recording the initial liquid level V0 of the liquid in the metering tube 11, opening the throttle valve 8, and starting to perform charging and discharging tests on the battery;
seventhly, observing the scale change condition in the measuring tube 11, when acquiring the gas output data of the battery, closing the throttle valve 8, moving the position of the measuring tube 11 up and down to enable the liquid level in the measuring tube 11 and the liquid level in the gas collecting tube 10 to be at the same horizontal position again, recording the difference value of the liquid level position V1 in the measuring tube 11, V1 and V0, namely the real-time gas output of the battery, opening the throttle valve 8 to continue charging and discharging, and repeating the seventh step when the next acquisition time is reached, so that the gas output of the battery in different periods in actual use can be detected in real time through the cyclic detection.
The results of the detection of the gas production of the two sets of model 18650 and 2600 batteries in the same time period are shown in table 1.
TABLE 118650 + 2600 Battery gas production
As can be seen from Table 1, the stability of detecting the gas production rate of the cylindrical lithium ion battery is high by using the method of the first embodiment of the invention, and the test requirements are met.
The gas production rate detection device for the secondary cylindrical battery in the embodiment of the invention is basically the same as the first embodiment, and is different in that the gas production rate detection device comprises a gas collecting bottle 17 and a measuring cylinder 19, dimethyl carbonate liquid is injected into the gas collecting bottle 17, the opening of the gas collecting bottle 17 is provided with a rubber plug 16 for sealing, the rubber plug 16 is provided with a gas inlet pipe 15 and a liquid outlet pipe 18, the upper end of the gas inlet pipe 15 is connected with a vent connecting pipe 104 on a top cover 1 in a sealing way through a connecting hose I7, the lower end of the gas inlet pipe 15 is arranged above the liquid level in the gas collecting bottle 17, the liquid outlet pipe 18 is an inverted U-shaped pipe, one end of the liquid outlet pipe is inserted into the bottom of the.
The air output of two groups of batteries (the type is 21700 batteries) is detected by adopting the second embodiment of the invention, the numbers of the first group of batteries are 1-1, 1-2 and 1-3, the numbers of the second group of batteries are 2-1, 2-2 and 2-3, and the detection steps are as follows:
firstly, a battery roll core is sleeved into a sleeve 2, then a positive electrode tab and a negative electrode tab of the battery roll core are respectively bent and respectively connected with the lower side surface of a tab pressing plate 14 on a top cover 1 and the upper side surface of the tab pressing plate 14 on a base 3, and two ends of the sleeve 2 are respectively connected with the top cover 1 and the base 3 through a sealing ring 13;
secondly, sequentially penetrating a bolt 4 through an insulating washer 5, a first mounting hole 103 of the top cover 1, a second mounting hole 303 of the base 3 and the insulating washer 5 from bottom to top, and sleeving a nut 6 at the end part to be screwed tightly;
thirdly, 8.3g of electrolytic liquid is injected into the sleeve 2 from the vent connecting pipe 104;
fourthly, injecting dimethyl carbonate (DMC) liquid into a gas collection bottle 17 of the vector gas device;
fifthly, the first connecting hose 7 is used for hermetically communicating the vent connecting pipe 104 with the air inlet pipe 15, and the throttle valve 8 is closed;
sixthly, placing the cylindrical battery gas production detection device into a charging and discharging device, respectively connecting the positive auxiliary tab 102 and the negative auxiliary tab 302 with corresponding interfaces of the charging and discharging device, moving the measuring cylinder 19 up and down to enable the liquid level in the gas collecting bottle 17 and the liquid level in the measuring cylinder 19 to be at the same horizontal position, recording the initial liquid level V0 of the liquid in the measuring cylinder 19, opening the throttle valve 8, and starting to perform charging and discharging tests on the battery;
and seventhly, observing the scale change condition in the measuring cylinder 17, when acquiring the gas output data of the battery, closing the throttle valve 8, moving the measuring cylinder 19 up and down to enable the liquid level in the measuring cylinder 19 and the liquid level in the gas collecting bottle 17 to be at the same horizontal position again, recording the liquid level position V1 in the measuring cylinder 18 at the moment, and the difference value between V1 and V0 is the real-time gas output of the battery, opening the throttle valve 8 to continue charging and discharging, and repeating the step seven when the next acquisition time is reached, so that the cyclic detection can detect the gas output of the battery in different periods in actual use.
The results of the gas production data detection of two groups of model 21700 batteries at 60 ℃ for 30 days are shown in table 2.
TABLE 221700 batteries, gas production at 60 ℃ for 30 days
As can be seen from Table 2, the stability of detecting the gas production rate of the cylindrical lithium ion battery by using the second embodiment of the invention is high, and the test requirements are met.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A cylinder battery gas production detection device is characterized by comprising a top cover, a sleeve, a base, a bolt, a first connecting hose and a gas measuring device, wherein a plurality of first mounting holes are formed in the periphery of the top cover, a plurality of second mounting holes are formed in the periphery of the base, the number of the first mounting holes is consistent with that of the second mounting holes, the positions of the first mounting holes and the second mounting holes correspond to each other one by one, the top cover and the base are made of stainless steel, the sleeve is a hollow cylinder with two open ends and made of polyethylene/polytetrafluoroethylene/engineering plastic, the two ends of the sleeve are respectively connected with a lower plane of the top cover and an upper plane of the base, sealing devices are arranged at the connection positions of the sleeve, the lower plane of the top cover and the upper plane of the base, the top cover and the base penetrate through the first mounting holes and the second mounting holes through the bolt, nuts are sleeved at the end parts for, the outer side surface of the top cover is provided with an outwardly extending positive auxiliary tab which is connected with the top cover into a whole, the outer side surface of the base is provided with an outwardly extending negative auxiliary tab which is connected with the base into a whole, when the battery winding core is in work, a battery winding core which is welded with the tab but does not encapsulate a shell is placed in the sleeve, the positive tab is arranged on the upper part, the negative tab is arranged on the lower part, tabs at two ends of the battery are respectively bent by the top cover and the base and pressed in the sleeve, the top cover is electrically conducted with the positive tab of the battery, the base is electrically conducted with the negative tab of the battery, the positive auxiliary tab on the top cover becomes an external positive electrode of a cylindrical battery to be measured, the negative auxiliary tab on the base becomes an external negative electrode of the cylindrical battery to be measured, the positive auxiliary tab and the negative auxiliary tab are respectively connected with corresponding interfaces of a charging and discharging device, the top cover is also provided with a ventilation connecting pipe which is communicated with, and a throttle valve is arranged at the connecting end of the first connecting hose and the ventilating connecting pipe.
2. The gas production detection device for a cylindrical battery according to claim 1, characterized in that: the utility model discloses a battery pole lug, including top cap, fixed connection, the top cap is the cake form, and lower bottom surface is equipped with the counter bore one coaxial with the top cap excircle, fixedly connected with and the coaxial utmost point ear clamp plate of top cap excircle in the middle of the counter bore one, utmost point ear clamp plate adopts stainless steel, be equipped with the sealing washer along the inside wall in the counter bore one, on the downside of sealing washer in the counter bore is located to sleeve upper end cover, during operation, the positive ear of battery is buckled and is compressed tightly in the sleeve by.
3. The gas production detection device for a cylindrical battery according to claim 2, characterized in that: the base is a cake shape, the upper plane is provided with a counter bore II coaxial with the outer circle of the base, a lug pressing plate coaxial with the outer circle of the base is arranged in the middle of the counter bore II, the lug pressing plate is made of stainless steel, a sealing ring is arranged in the counter bore II along the inner side wall, the lower end of the sleeve is sleeved on the upper side face of the sealing ring in the counter bore II, and when the battery negative electrode tab works, the battery negative electrode tab is bent by the lug pressing plate and is pressed in the sleeve.
4. The gas production detection device for a cylindrical battery according to claim 3, characterized in that: the first connecting hose is a transparent rubber hose, so that the air outlet condition can be observed conveniently.
5. The gas production detection device for a cylindrical battery according to claim 4, characterized in that: the air measuring device comprises a gas collecting pipe, a measuring pipe, a second connecting hose and a rubber plug with a gas inlet pipe, wherein the measuring pipe and the gas collecting pipe are all universal burettes, two ends of the connecting hose are respectively communicated with the bottom of the gas collecting pipe and the bottom of the measuring pipe in a sealing mode to form a U-shaped pipe, the rubber plug with the gas inlet pipe is blocked and arranged at the upper end of the gas collecting pipe, the gas inlet pipe is communicated with the other end of the first connecting hose in a sealing mode, and the upper end of the measuring pipe is opened and communicated with the.
6. The gas production detection device for a cylindrical battery according to claim 4, characterized in that: the gas measuring device comprises a gas collecting bottle and a measuring cylinder, dimethyl carbonate liquid is injected into the gas collecting bottle, a gas collecting bottle opening is provided with a rubber plug for sealing, an air inlet pipe and a liquid outlet pipe are arranged on the rubber plug, the upper end of the air inlet pipe is connected with a ventilation connecting pipe on a top cover through a connecting hose I in a sealing mode, the lower end of the air inlet pipe is arranged above a liquid level, the liquid outlet pipe is an inverted U-shaped pipe, one end of the liquid outlet pipe is inserted into the bottom of the gas collecting bottle, a gap is reserved close to the bottom surface of the gas collecting bottle.
7. A detection method of the gas production amount detection device for a cylindrical battery according to any one of claims 1 to 6, characterized in that: the steps of the method for detecting the gas production of the cylindrical battery are as follows,
firstly, a battery roll core is sleeved into a sleeve, then a positive electrode lug and a negative electrode lug of the battery roll core are respectively bent and respectively connected with the lower side surface of a top cover/the lower side surface of a tab pressing plate on the top cover and the upper side surface of a base/the upper side surface of the tab pressing plate on the base, and two ends of the sleeve are respectively connected with the top cover and the base through sealing rings;
secondly, a bolt sequentially penetrates through the insulating washer, the mounting hole I of the top cover, the mounting hole II of the base and the insulating washer from bottom to top, and a nut is sleeved at the end part of the bolt and screwed down;
thirdly, injecting electrolytic liquid into the sleeve from the vent connecting pipe;
fourthly, injecting dimethyl carbonate liquid into a gas collecting pipe/a gas collecting bottle of the gas measuring device;
fifthly, communicating the first connecting hose with the air inlet pipe of the air measuring device through the vent connecting pipe and closing the throttle valve;
sixthly, placing the cylindrical battery gas production amount detection device into a charging and discharging device, respectively connecting a positive electrode and a negative electrode with corresponding interfaces of the charging and discharging device, moving the measuring tube/measuring cylinder up and down to enable the liquid level in the gas collecting tube/gas collecting bottle and the liquid level in the measuring tube/measuring cylinder to be at the same horizontal position, recording the initial liquid level V0 of the liquid in the measuring tube/measuring cylinder, opening a throttle valve, and starting to perform charging and discharging tests on the battery;
and seventhly, observing the scale change condition in the measuring cylinder, when acquiring the gas output data of the battery, closing the throttle valve, moving the position of the measuring tube/measuring cylinder up and down to enable the liquid in the measuring tube/measuring cylinder and the liquid level in the gas collecting tube/gas collecting bottle to be at the same horizontal position again, recording the position V1 of the liquid level in the measuring tube/measuring cylinder, opening the throttle valve to continue charging and discharging, and repeating the step seven when the next acquisition time is reached, wherein the gas output in the actual use of the battery can be detected in real time through the cyclic detection.
8. The detection method of the gas production amount detection device for the cylindrical battery according to claim 7, characterized in that: and in the third step, 5-10 g of electrolytic liquid is injected into the sleeve.
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| CN201911101470.6A CN110779592A (en) | 2019-11-12 | 2019-11-12 | Gas production rate detection device and detection method for cylindrical battery |
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| CN201911101470.6A CN110779592A (en) | 2019-11-12 | 2019-11-12 | Gas production rate detection device and detection method for cylindrical battery |
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Cited By (1)
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Address after: 336000 Yichun economic and Technological Development Zone, Jiangxi, Yichun Applicant after: Jiangxi Far East Battery Co., Ltd Address before: 336000 Yichun economic and Technological Development Zone, Yuanzhou District, Jiangxi, Yichun Applicant before: FAR EAST FIRST NEW ENERGY Co.,Ltd. |
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Application publication date: 20200211 |