CN214780770U - Lithium battery leak detection helium recovery and purification system - Google Patents
Lithium battery leak detection helium recovery and purification system Download PDFInfo
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- CN214780770U CN214780770U CN202120857172.6U CN202120857172U CN214780770U CN 214780770 U CN214780770 U CN 214780770U CN 202120857172 U CN202120857172 U CN 202120857172U CN 214780770 U CN214780770 U CN 214780770U
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Abstract
The utility model relates to a lithium cell leak hunting helium recovery purification system for the rich helium leak hunting gas to in a plurality of lithium cell leak hunting production lines (10) is retrieved, include at recovery unit (2), purification unit (3), air feed unit (4) that connect gradually along the gas flow direction to and the control unit (5). The utility model discloses a set up the recovery pipeline of a plurality of parallelly connected settings in recovery unit (2), can retrieve the rich helium leak hunting gas in a plurality of lithium cell leak hunting production line (10) simultaneously. And the high-concentration helium gas purified by the purification unit (3) is supplied to a plurality of lithium battery leakage detection production lines (10) on line through the gas supply unit (4) for recycling, so that the purified gas can be completely supplied to the production lines, the situation that the number of the purified gas supplied to the lithium battery production lines (10) is small is avoided, and the high-purity helium gas is circularly supplied with surplus, so that the pressure of the gas supply buffer tank (44) is high.
Description
Technical Field
The utility model relates to a lithium cell leak hunting field, especially lithium cell leak hunting helium recovery purification system.
Background
Helium is a scarce strategic resource and is widely applied to the fields of national defense and military industry, scientific research, aerospace, optical fiber manufacturing, air conditioner leakage detection, lithium battery leakage detection and the like. Helium has little content in air, at present, the helium mainly depends on natural gas, and then the helium is separated from the natural gas, so the extraction difficulty is high, and the cost is high. Therefore, the method has wide application prospect in protecting limited helium resources and researching efficient waste helium recovery and purification technology. In the field of lithium battery leak detection, helium is generally used as a gas for leak detection of a lithium battery case.
In the field of lithium battery leak detection, production equipment of the lithium battery leak detection equipment generally comprises a plurality of leak detection production lines. How to realize that two leak hunting production lines carry out intelligent ground recovery and cyclic utilization simultaneously, lack corresponding solution at present.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that solve lies in how to realize that two leak hunting production lines retrieve and cyclic utilization simultaneously intelligently.
The utility model discloses a following technical means realizes solving above-mentioned technical problem:
a helium recovery and purification system for lithium battery leak detection is used for recovering helium-rich leak detection gas in a plurality of lithium battery leak detection production lines (10), and comprises a recovery unit (2), a purification unit (3), a gas supply unit (4) and a control unit (5) which are sequentially connected along the gas flow direction;
the recovery unit (2) comprises a balloon (27) and a plurality of recovery pipelines arranged in parallel, each recovery pipeline is correspondingly connected with 1 lithium battery leakage detection production line, and the recovered helium-rich leakage detection gas is collected to the balloon (27);
the purification unit (3) comprises a primary compression pump (301), a cold dryer (302), a filter assembly (303) and a membrane separation and purification device which are sequentially connected through pipelines, wherein an air inlet of the primary compression pump (301) is connected with an air outlet of the balloon (27);
air feed unit (4) intercommunication purification unit (3) and lithium cell leak hunting production line (10), air feed unit (4) are including connecting gradually air feed buffer tank (44) and check valve (45) on the pipeline, and the exit of the access connection membrane separation purification device of air feed buffer tank (44), the exit linkage of check valve (45) to lithium cell leak hunting production line (10), the upper reaches of air feed buffer tank (44) are equipped with air feed flowmeter (43).
The utility model discloses a set up the recovery pipeline of a plurality of parallelly connected settings in recovery unit (2), can retrieve the rich helium leak hunting gas in a plurality of lithium cell leak hunting production line (10) simultaneously. And the high-concentration helium gas purified by the purification unit (3) is supplied to a plurality of lithium battery leakage detection production lines (10) for recycling on line through the gas supply buffer tank (44) and the one-way valve (45), so that the purified gas can be completely supplied to the production lines, the situation that the number of the lithium battery leakage detection production lines (10) is small is avoided, and the high-concentration helium gas is circularly supplied with surplus, so that the gas supply buffer tank (44) has high pressure. A pressure stabilizing valve (46) is arranged on the upstream of the one-way valve (45), so that the pressure fluctuation is prevented from influencing the operation of the lithium battery leak detection production line (10), and the stability of the gas supply end is greatly improved.
As a preferred technical scheme, each recovery pipeline comprises a vacuum pump (24), and the vacuum pump (24) is arranged between the lithium battery leakage detection production line and the balloon (27).
Preferably, a first control valve (20), a first valve (21), a negative pressure meter (22) and a negative pressure tank (23) are further sequentially arranged on a front end pipeline of the vacuum pump (24) from front to back, and the first control valve (20) and the negative pressure meter (22) are both connected to the control unit (5).
Preferably, a precision filter (25) and an air inlet flow meter (26) are arranged on a front end pipeline of the balloon (27), and a helium purity meter (28) is arranged at the rear end.
As a preferable technical scheme, the membrane separation and purification device comprises a primary membrane separation purifier (304), a secondary compression pump (305), a gas collecting tank (306), a secondary membrane separation purifier (307) and a second control valve (309), wherein the primary membrane separation purifier, the secondary compression pump (305), the gas collecting tank (306), the secondary membrane separation purifier (307) and the second control valve (309) are sequentially connected to a pipeline, a tail gas outlet of the secondary membrane separation purifier (307) is connected to a balloon (27), an outlet of the second control valve (309) is connected to an inlet of a gas supply buffer tank (44), and the second control valve (309) is connected to a control unit (5).
Preferably, a first helium purity meter (308) and a third control valve (310) are arranged at the output end of the purification unit (3), the third control valve (310) is arranged on a pipeline between gas output ports of the primary membrane separation purifier 34 and the secondary membrane separation purifier (307), and the first helium purity meter (308) and the third control valve (310) are both connected to the control unit (5).
As a preferable technical scheme, a second helium purity meter (40), a fourth control valve (41) and a fifth control valve (42) are arranged at the inlet end of the gas supply unit (4), the second helium purity meter (40) and the fourth control valve (41) are sequentially arranged between the outlet of the purification unit (3) and the gas supply buffer tank (44), the fifth control valve (42) is arranged between the outlet of the purification unit (3) and the balloon (27), and the second helium purity meter (40), the fourth control valve (41) and the fifth control valve (42) are all connected to the control unit (5).
As a preferred technical scheme, the control valves are all electronic valves.
As a preferable technical scheme, the lithium battery leak detection helium recovery and purification system further comprises an external helium gas source (6), and the helium gas source (6) is directly connected with a plurality of lithium battery leak detection production lines (10).
The utility model has the advantages that:
1. the utility model discloses a set up the recovery pipeline of a plurality of parallelly connected settings in recovery unit (2), can retrieve the rich helium leak hunting gas in a plurality of lithium cell leak hunting production line (10) simultaneously. And the high-concentration helium gas purified by the purification unit (3) is supplied to a plurality of lithium battery leakage detection production lines (10) for recycling on line through the gas supply buffer tank (44) and the one-way valve (45), so that the purified gas can be completely supplied to the production lines, the situation that the number of the lithium battery leakage detection production lines (10) is small is avoided, and the high-concentration helium gas is circularly supplied with surplus, so that the gas supply buffer tank (44) has high pressure. A pressure stabilizing valve (46) is arranged on the upstream of the one-way valve (45), so that the pressure fluctuation is prevented from influencing the operation of the lithium battery leak detection production line (10), and the stability of the gas supply end is greatly improved.
2. The utility model discloses according to the production load degree of many lithium cell production lines, automatic control unit's control carries out load rational distribution to retrieving the purification device, and low-load or load overload operation and to a great extent have improved the stability and the purification efficiency of equipment appear in effectual recovery purification device of avoiding.
3. The utility model discloses control system is through gathering the high low level signal of sacculus, opening and closing of intelligent control helium purification equipment to under the undulant condition of fresh helium quantity of cooling helium pipe, the useless helium tolerance of automatically regulated recovery guarantees higher helium purity and recovery efficiency.
4. The utility model provides a hot type mass flow controller is chooseed for use to intake flowmeter and air feed flowmeter, its precision height, good reproducibility, response speed are fast, reliable and stable, operating pressure scope is wide, can satisfy the demand of carrying out precision measurement and control to the mass flow of gas.
Drawings
Fig. 1 is a block diagram of a helium recovery and purification system for lithium battery leak detection, in which the arrow direction indicates the flow direction of helium.
Fig. 2 is a schematic flow chart of a specific structure of a helium recovery and purification system for lithium battery leak detection according to a preferred embodiment of the present invention.
FIG. 3 is an enlarged view of the recovery unit of FIG. 2;
fig. 4 is an enlarged view of the purification unit in fig. 2.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 and fig. 2, the utility model provides a pair of lithium cell leak hunting helium recovery purification system for the rich helium leak hunting gas to in the N lithium cell leak hunting production line 10 is retrieved. In this embodiment, N is 2, that is, there are 2 lithium battery leak detection production lines, that is, the # 1 production line and the # 2 production line in fig. 2.
Lithium cell leak hunting helium recovery purification system, it includes at recovery unit 2, purification unit 3, air feed unit 4, the control unit 5 and the helium gas source 6 that connect gradually along the gas flow direction.
The number of the recovery units 2 and the lithium battery leakage detection production line 10 is 1 to multiple structural relation. The purification unit 3 can be equipped with helium purification equipment with corresponding specifications according to the number of lithium battery leak detection production lines. And the helium reaching the standard of the gas supply unit 4 is supplied to a lithium battery leak detection production line 10.
Referring also to fig. 3, the recovery unit 2 includes a balloon 27 and 2 recovery pipes connected in parallel. Each recovery pipeline is correspondingly connected with 1 lithium battery leakage detection production line, and the recovered helium-rich leakage detection gas is collected to the balloon 27. Each recovery pipeline comprises a vacuum pump 24, and a first control valve 20, a first valve 21, a negative pressure meter 22 and a negative pressure tank 23 can be sequentially arranged on the pipeline at the front end of the vacuum pump 24 from front to back so as to independently control the lithium battery leak detection production line 10.
The negative pressure gauge 22 is provided on a pipe at the front end of the negative pressure tank 23, and monitors the pressure in the negative pressure tank 23.
The first control valve 20 and the negative pressure gauge 22 are both connected to the control unit 5, and the control unit 5 adjusts the opening or closing of the first control valve 20 according to the monitoring data of the negative pressure gauge 22.
The first valve 21 is used for disconnecting the lithium battery leak detection production line 10 from the lithium battery helium recovery and purification system 100, so that the back-end equipment can be maintained conveniently.
A precision filter 25 and an air inlet flow meter 26 are arranged on a pipeline at the front end of the balloon 27, and a helium purity meter 28 is arranged at the rear end. The fine filter 25 filters the helium-rich leak detection gas drawn by the vacuum pump 24. The inlet gas flow meter 26 and the helium purity meter 28 monitor the flow and purity of the filtered gas, respectively.
Referring to fig. 4, the purification unit 3 includes a first-stage compression pump 301, a freeze dryer 302 and a filter assembly 303 connected in sequence by a pipeline, wherein an air inlet of the first-stage compression pump 301 is connected to an air outlet of the balloon 27. The primary compression pump 301 operates to suck the helium-rich gas in the balloon 27 into the freeze drying machine 302, the freeze drying machine 302 is used for cooling the helium-rich gas output by the primary compression pump 301 so as to remove gaseous water therein, the filter assembly 303 is in the form of a two-stage filter so as to sufficiently remove small particles, dust and moisture in the helium-rich gas output by the freeze drying machine 302, and the primary compression pump 301 is connected to the control unit 5.
The preferred embodiment is a membrane separation and purification scheme. The purification unit 3 further comprises a primary membrane separation purifier 304, a secondary compression pump 305, a gas collecting tank 306, a secondary membrane separation purifier 307 and a second control valve 309 which are sequentially connected to the pipeline, wherein a tail gas outlet of the secondary membrane separation purifier 307 is connected to the balloon 27, and the second control valve 309 is connected to the control unit 5.
The primary membrane separation purifier 304 primarily purifies the filtered gas, the secondary compression pump 305 pressurizes the gas purified by the primary membrane separation purifier to working pressure and flows into the gas collecting tank 306, and the gas collecting tank 306 buffers the pressurized gas and then flows into the secondary membrane separation purifier 307. The tail gas of the primary membrane separation purifier 304 is directly exhausted so as to improve the outlet gas purity of the primary membrane separation purifier 304, and the high-purity helium gas output by the secondary membrane separation purifier 307 flows into a gas supply pipeline. The tail gas of the secondary membrane separation purifier 307 returns to the balloon 27, so as to improve the recovery rate of helium. The technology of separating gas by membrane separation method is to utilize some metal membranes or organic membranes to have the characteristics of selective permeation and diffusion to some gas components so as to achieve the purpose of gas separation and purification. The method takes partial pressure difference of gas on two sides of a membrane as driving force, and realizes separation by generating difference of transfer rates among components through steps of dissolution, diffusion, permeation, desorption and the like. Compared with the low-temperature condensation adsorption method and the pressure swing adsorption method, the method has the characteristics of low energy consumption, convenient use, large operation elasticity and the like due to operation at normal temperature.
The gas supply unit 4 is used for receiving the high-purity helium gas provided by the purification unit 3 and delivering the helium gas to the lithium battery leak detection production line 10. The air supply unit 4 comprises an air supply buffer tank 44 and a one-way valve 45 which are sequentially connected on a pipeline, and an outlet of the one-way valve 45 is connected to the lithium battery leak detection production line 10. The gas supply buffer tank 44 buffers gas up to standard, and the upper reaches are equipped with the gas supply flowmeter 43, the gas supply flowmeter 43 measures gas up to standard of gas supply line. High concentration helium after purification unit 3 supplies to N lithium cell leak hunting production line 10 circulation through supplying gas buffer tank 44, check valve 45 on line and uses, guarantees that the gas after the purification can all supply the production line, avoids appearing supplying with lithium cell production line 10 quantity less, and high-purity helium circulation is supplied with has the surplus, leads to supplying gas buffer tank 44 to appear pressure on the high side. A pressure stabilizing valve 46 is arranged at the upstream of the one-way valve 45, so that the pressure fluctuation is prevented from influencing the operation of the lithium battery leak detection production line 10, and the stability of a gas supply end is greatly improved.
Preferably, the intake air flow meter 26 and the intake air flow meter 43 are thermal mass flow controllers.
Preferably, the helium recovery and purification system for lithium battery leakage detection further comprises an external helium gas source 6, the helium gas source 6 is directly connected with the N lithium battery leakage detection production lines 10, and in order to supplement the loss of the helium in the online recovery and purification process, the helium gas source and the gas supply buffer tank 44 respectively supply gas to the N lithium battery leakage detection production lines 10. Meanwhile, the uninterrupted operation of the lithium battery leak detection production line can be ensured under the condition that the helium supply of the air supply sink buffer tank is interrupted when the recovery unit 101 or the purification unit 102 fails. In addition, in order to prevent the helium gas source 6 from reversely flowing into the gas supply buffer tank 44, a check valve 45 is provided at the output end of the gas supply buffer tank 44 for protection.
Preferably, a first helium purity meter 308 and a third control valve 310 are arranged at the output end of the purification unit 3, the third control valve 310 is arranged on a pipeline between the gas output ports of the primary membrane separation purifier 34 and the secondary membrane separation purifier 307, and the first helium purity meter 308 and the third control valve 310 are both connected to the control unit 5. The high purity helium gas output from the secondary membrane separation purifier 307 flows into the gas supply line through the outlet first helium purity meter 308, and the outlet first helium purity meter 308 monitors the purity of the high purity helium gas output from the secondary membrane separation purifier 307 so as to determine whether the second control valve 309 and the third control valve 310 are opened or closed. Specifically, when the first helium purity meter 308 detects that the purity of the product gas is greater than a set value (for example, 99%), the second control valve 309 for gas supply is automatically opened, and the standard-reaching gas flows into the gas supply pipeline; if the purity of the product gas is less than the set value (for example, 99%), the third control valve 310 is opened, and the gas which does not reach the standard is returned to the front end of the first-stage membrane separation purifier 34 for purification again.
Preferably, a second helium purity meter 40, a fourth control valve 41 and a fifth control valve 42 are provided at the inlet end of the gas supply unit 4, the second helium purity meter 40 and the fourth control valve 41 are sequentially provided between the outlet of the purification unit 3 and a gas supply buffer tank 44, the fifth control valve 42 is provided between the outlet of the purification unit 3 and the balloon 27, and the second helium purity meter 40, the fourth control valve 41 and the fifth control valve 42 are all connected to the control unit 5. The second helium purity meter 40 detects the gas purity in the gas supply line so as to determine the opening or closing of the fourth control valve 41 and the fifth control valve 42. Specifically, the second purity meter 40 re-detects the standard-reaching gas, and if the helium purity in the gas supply line is greater than a set value (for example, 99%), automatically opens the fourth control valve 41, and the standard-reaching gas is supplied to the N lithium battery leak detection production lines 10 under a pressure-stabilized condition through the gas supply buffer tank 44; if the purity of the helium in the gas supply line is less than the set value (e.g., 99%), the fifth control valve 42 is opened to return the substandard gas to the balloon 27 for further purification.
It should be noted that the first control valve 20, the second control valve 309, the third control valve 310, the fourth control valve 41, and the fifth control valve 42 are electronic valves, so that the intelligent control is performed according to the use requirement of the system.
In order to know the production condition of the production line in real time, the control unit 5 carries out linkage control on the recovery unit 2, the purification unit 3 and the air supply unit 4, a high-low sensor is installed on the balloon 27 and connected to the control unit 5, and the control unit 5 acquires the height of the balloon 27 through a signal line so as to control the opening and closing of the compression pump 301 and control the opening and closing of the whole purification unit 3. When the balloon 27 is in the high position, the purification unit 3 is opened, and when the balloon 27 is in the low position, the purification unit 3 is closed.
The technical contents not described in detail in the present invention are all known techniques.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. The utility model provides a lithium cell leak hunting helium recovery purification system for the rich helium leak hunting gas to in a plurality of lithium cell leak hunting production lines (10) is retrieved, its characterized in that: comprises a recovery unit (2), a purification unit (3), an air supply unit (4) and a control unit (5) which are connected in sequence along the gas flowing direction;
the recovery unit (2) comprises a balloon (27) and a plurality of recovery pipelines arranged in parallel, each recovery pipeline is correspondingly connected with 1 lithium battery leakage detection production line, and the recovered helium-rich leakage detection gas is collected to the balloon (27);
the purification unit (3) comprises a primary compression pump (301), a cold dryer (302), a filter assembly (303) and a membrane separation and purification device which are sequentially connected through pipelines, wherein an air inlet of the primary compression pump (301) is connected with an air outlet of the balloon (27);
air feed unit (4) intercommunication purification unit (3) and lithium cell leak hunting production line (10), air feed unit (4) are including connecting gradually air feed buffer tank (44) and check valve (45) on the pipeline, and the exit of the access connection membrane separation purification device of air feed buffer tank (44), the exit linkage of check valve (45) to lithium cell leak hunting production line (10), the upper reaches of air feed buffer tank (44) are equipped with air feed flowmeter (43).
2. The lithium battery leak detection helium recovery and purification system as claimed in claim 1, wherein: each recovery pipeline comprises a vacuum pump (24), and the vacuum pump (24) is arranged between the lithium battery leakage detection production line and the balloon (27).
3. The lithium battery leak detection helium recovery and purification system as claimed in claim 2, wherein: still set gradually first control flap (20), first valve (21), negative pressure table (22), negative pressure jar (23) after the past on vacuum pump (24) front end pipeline, first control flap (20) and negative pressure table (22) all are connected to control unit (5).
4. A lithium battery leak detection helium recovery purification system as claimed in claim 3, wherein: a precision filter (25) and an air inlet flow meter (26) are arranged on a pipeline at the front end of the balloon (27), and a helium purity meter (28) is arranged at the rear end.
5. The lithium battery leak detection helium recovery and purification system of claim 4, wherein: and the air inlet flow meter (26) and the air supply flow meter (43) adopt thermal mass flow controllers.
6. The lithium battery leak detection helium recovery and purification system as claimed in claim 1, wherein: the membrane separation and purification device comprises a first-stage membrane separation purifier (304), a second-stage compression pump (305), a gas collecting tank (306), a second-stage membrane separation purifier (307) and a second control valve (309), wherein the first-stage membrane separation purifier, the second-stage compression pump (305), the gas collecting tank (306), the second-stage membrane separation purifier (307) and the second control valve (309) are sequentially connected to a pipeline, a tail gas outlet of the second-stage membrane separation purifier (307) is connected to the balloon (27), an outlet of the second control valve (309) is connected with an inlet of the gas supply buffer tank (44), and the second control valve (309) is connected to the control unit (5).
7. The lithium battery leak detection helium recovery and purification system of claim 6, wherein: and a first helium purity meter (308) and a third control valve (310) are arranged at the output end of the purification unit (3), the third control valve (310) is arranged on a pipeline between gas output ports of the primary membrane separation purifier (304) and the secondary membrane separation purifier (307), and the first helium purity meter (308) and the third control valve (310) are both connected to the control unit (5).
8. The lithium battery leak detection helium recovery and purification system of claim 7, wherein: the inlet end of the gas supply unit (4) is provided with a second helium purity meter (40), a fourth control valve (41) and a fifth control valve (42), the second helium purity meter (40) and the fourth control valve (41) are sequentially arranged between the outlet of the purification unit (3) and the gas supply buffer tank (44), the fifth control valve (42) is arranged between the outlet of the purification unit (3) and the balloon (27), and the second helium purity meter (40), the fourth control valve (41) and the fifth control valve (42) are all connected to the control unit (5).
9. A lithium battery leak detection helium recovery and purification system as claimed in any one of claims 3, 6, 7 and 8, wherein: the control valves are all electronic valves.
10. The lithium battery leak detection helium recovery and purification system as claimed in claim 1, wherein: the lithium battery leak detection helium recovery and purification system further comprises an external helium gas source (6), and the helium gas source (6) is directly connected with a plurality of lithium battery leak detection production lines (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120857172.6U CN214780770U (en) | 2021-04-22 | 2021-04-22 | Lithium battery leak detection helium recovery and purification system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120857172.6U CN214780770U (en) | 2021-04-22 | 2021-04-22 | Lithium battery leak detection helium recovery and purification system |
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| CN214780770U true CN214780770U (en) | 2021-11-19 |
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| CN202120857172.6U Active CN214780770U (en) | 2021-04-22 | 2021-04-22 | Lithium battery leak detection helium recovery and purification system |
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