Lithium battery gas release, collection and detection all-in-one machine

Abstract

The invention belongs to the technical field of battery detection, and particularly relates to a lithium battery gas releasing, collecting and detecting all-in-one machine which comprises an experiment tank, a control machine body, an inert gas tank, a gas collecting tank and an experiment device, and a to-be-detected battery pack is limited and fixed to the middle position in the experiment tank through a fixing and clamping assembly; the inert gas tank is communicated with the interiors of the experiment tank and the gas collection tank, and the control machine body carries an operation software system and is used for controlling each component to detect the to-be-detected battery pack; the temperature control cavity is formed in the side wall of the experiment tank, the temperature control cavity can be filled with the heating medium, and an existing heating control system is arranged on the side wall of the temperature control cavity, so that temperature control over the experiment environment in the experiment tank is achieved, and experiment data of test items conducted on the battery pack under different temperature conditions are obtained; the richness of experimental data is increased, and data support is provided for subsequent performance test and improvement of the lithium battery.

Description

Technical Field

[0001] The invention belongs to the technical field of battery detection, in particular to a lithium battery gas release, collection and detection integrated machine. Background Art

[0002] With the increasing demand for energy storage batteries and power batteries at home and abroad, especially the booming development of electric vehicles, the demand for lithium power batteries, as an indispensable power supply component for electric vehicles, has also risen. However, during the use of batteries, the battery may experience thermal runaway due to countless charge and discharge. When out of control, the battery will generate high temperature and a large amount of harmful gases, which may cause fire or even explosion in severe cases. In order to ensure the safety of lithium batteries before leaving the factory, it is particularly important to test their safety performance.

[0003] At present, the market conducts overcharge, overheating, puncture and extrusion tests by simulating the triggering of thermal runaway. However, most of the current test equipment has only a single test function, and the gas generated by thermal runaway is only discharged through the gas treatment device. It is unknown what kind of harm the gas generated by battery abnormality will cause to the environment and human body. Therefore, a detection device with good sealing characteristics that integrates overcharge, overheating, puncture and gas collection is studied, which collects the gas and smoke generated by battery abnormality for gas analysis equipment to analyze the harmfulness of gas.

[0004] There are many kinds of gas collection equipment on the market. Generally, fire is used to generate smoke, and then a smoking device is used to extract the smoke from battery fire. The extracted smoke and gases are mixed, and the data analysis varies too much. It can only provide a single temperature condition, that is, a thermal runaway trigger experiment is performed on the battery pack at room temperature, and then collection is performed after the thermal runaway ends and the gas is cooled to room temperature. Frequent use may lead to inaccurate detection of gas component content. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art and solve the above technical problems; the present invention proposes a lithium battery gas release collection and detection integrated machine, comprising a test tank, a control body, an inert gas tank, a gas collection tank and an experimental device, the battery pack to be tested is limited and fixed to the middle position inside the test tank by a fixed clamping assembly; the inert gas tank is communicated with the inside of the test tank and the gas collection tank, and the control body is equipped with an operating software system to control the detection of the battery pack to be tested by various components; The experimental device includes an overcharging system and a heating puncture mechanism, which are used to detect the battery pack to be tested and transmit the detection data to the display interface of the control body; The side wall of the experimental tank is provided with an annular temperature control cavity, which is connected to a circulating cooling system to control the experimental temperature inside the experimental tank; The experimental tank is connected to the gas collection tank through a collection tube, and the experimental triggering steel needle of the heating puncture mechanism passes through the detection port at the end of the experimental tank and is slidably connected to the detection port to perform puncture detection on the battery pack inside the experimental tank.

[0006] Preferably, the gas collection tank comprises a tank body, a top cover, an air filling pipe and an air outlet pipe, wherein the air filling pipe passes through the top cover and communicates with the collection pipe, and the air outlet pipe is located at the bottom of the tank body and communicates with the inside of the tank body; A separation cylinder is arranged on the lower surface of the top cover, and the area enclosed between the separation cylinder and the top cover is a separation chamber; the end of the inflation tube extends into the separation chamber, and the side wall of the inflation tube located inside the separation chamber is evenly provided with air outlet holes, the side wall of the separation cylinder is evenly provided with release holes, and an annular separation net is arranged in the area inside the separation chamber between the air outlet holes and the release holes.

[0007] Preferably, a flushing chamber is provided in the area inside the top cover located on the upper side of the separation chamber, and the flushing chamber is communicated with the inside of the inflation tube through a connecting hole provided on the side wall of the inflation tube. Flushing holes are evenly provided at the bottom of the flushing chamber, and the bottom openings of the flushing holes point to the side surface of the separation net close to the air outlet.

[0008] Preferably, a control valve is provided in the area inside the inflation tube between the communicating hole and the air outlet, and the control valve is controlled by an external controller.

[0009] Preferably, the area at the bottom of the separation chamber located below the end of the inflation tube is a collecting chamber, and the collecting chamber is connected to the interior of the gas collection tank through leakage holes evenly arranged at the bottom; an interception net is arranged on the upper side of the leakage hole, and the cross-section of the interception net is an inverted V-shaped, and extends in a ring shape around the central axis of the collecting chamber; the top opening of the leakage hole is located in the area surrounded by the interception net, and the gap area between adjacent interception nets is filled with ash-absorbing material.

[0010] Preferably, a cleaning ring is slidably provided in the annular gap area between the separation net and the inflation tube, and the cleaning ring is connected to the driving rod. The top of the driving rod slides upward through the flushing hole and is connected to the output end of the pushing device on the upper side of the flushing chamber, and the pushing device is controlled by an external controller; the diameter of the driving rod is smaller than the flushing hole, and the cleaning ring is in contact with the surface of the separation net on one side close to the air outlet.

[0011] Preferably, the upper surface of the cleaning ring is an inclined surface, and cleaning grooves are evenly arranged on the outer circular end portion of the cleaning ring close to the surface of the separation net, and bristles are evenly arranged on the inner surface of the cleaning grooves.

[0012] Preferably, the interior of the cleaning ring is hollow and communicates with the interior of the separation chamber through a supplementary hole arranged on the top, and an impact hole is arranged on the inner wall of the cleaning groove, and the impact hole is located in the gap between the bristles and communicates with the hollow part inside the cleaning ring.

[0013] Preferably, the separation cylinder includes a separation part and a discharge part, the separation part and the discharge part are separated from each other, and a limiting ring arranged at the top of the discharge part is slidably embedded in a limiting groove arranged at the bottom of the separation part, and the limiting ring is connected to the inner wall of the limiting groove by an elastic member.

[0014] Preferably, the separation net is made of elastic material, and the portion of the separation net facing the air outlet protrudes toward the opening of the air outlet to form a vibrating part with an annular protruding structure, the vertical cross-section of the vibrating part is an arc-shaped structure, and the top of the separation net is connected to the inner wall of the top of the separation part, and the bottom of the separation net is connected to the inner wall of the discharge part.

[0015] The beneficial effects of the present invention are as follows: The lithium battery gas release collection and detection integrated machine of the present invention is provided with a temperature control chamber in the side wall of the experimental tank, the interior of the temperature control chamber can be filled with a heating medium, and the side wall of the temperature control chamber is provided with an existing heating control system, so as to realize the temperature control of the experimental environment inside the experimental tank, obtain the experimental data of the test items of the battery pack under different temperature conditions, increase the richness of the experimental data, and provide data support for the subsequent performance test and improvement of the lithium battery; After the battery pack releases gas due to thermal runaway, the air pressure inside the experimental tank increases. At this time, the gas generated by the experiment can be pumped into the gas collection tank through a vacuum pump, which will be used as a sample for later analysis of the composition differences of the gas released by the battery pack under different experimental projects and different experimental conditions, thereby better evaluating the performance of lithium batteries under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Figure 1 is a stereogram of the present invention; Figure 2 is a front view of the present invention; Figure 3 It is a schematic diagram of the cooperation between the experimental tank and the heating acupuncture mechanism in the present invention; Figure 4 is a cross-sectional view of the gas collection tank in the present invention; Figure 5 yes Figure 4 A partial enlarged view of the middle A; Figure 6 yes Figure 5 A partial enlarged view of point B in the middle; Figure 7 yes Figure 5 A partial enlarged view of point C in the middle.

[0018] In the figure: experimental tank 1, temperature control chamber 11, circulating cooling system 12, collection tube 13, detection port 14, control body 2, gas collection tank 3, tank body 31, top cover 32, flushing chamber 321, flushing hole 322, inflation tube 33, air outlet hole 331, connecting hole 332, control valve 333, air outlet pipe 34, heating acupuncture mechanism 4, experimental triggering steel needle 41, battery pack 5, separation cylinder 6, separation chamber 61, release hole 62, separation net 63, vibration part 631, collection chamber 64, leakage hole 641, interception net 642, cleaning ring 65, driving rod 651, cleaning groove 652, replenishing hole 653, impact hole 654, separation part 66, limiting slide groove 661, leakage part 67, limiting ring 671. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Embodiment 1:

[0021] The existing lithium battery testing equipment can only provide a single temperature condition, that is, the thermal runaway triggering experiment is performed on the battery pack 5 at room temperature, and the gas is collected after the thermal runaway ends and the gas is cooled to room temperature. Frequent use may result in inaccurate detection of gas component content. In order to effectively solve the above problems, as shown in the accompanying drawings of the specification Figure 1-Figure 7 As shown, the present application proposes a lithium battery gas release collection and detection integrated machine, including an experimental tank 1, a control body 2, an inert gas tank, a gas collection tank 3 and an experimental device, the battery pack 5 to be tested is limited and fixed to the middle position inside the experimental tank 1 by a fixed clamping assembly; the inert gas tank is connected to the inside of the experimental tank 1 and the gas collection tank 3, and the control body 2 is equipped with an operating software system to control the detection of the battery pack 5 to be tested by each component; The experimental device includes an overcharging system and a heating puncture mechanism 4, which are used to detect the battery pack 5 to be tested and transmit the test data to the display interface of the control body 2; The side wall of the experimental tank 1 is provided with an annular temperature control chamber 11, which is connected to a circulating cooling system 12 to control the experimental temperature inside the experimental tank 1 and provide various temperature experimental conditions; The experimental tank 1 is connected to the gas collection tank 3 through the collection tube 13. Multiple detection ports 14 are respectively arranged on both sides of the experimental tank 1. The experimental trigger steel needle 41 of the heated puncture mechanism 4 passes through the detection port 14 at one end of the experimental tank 1 and is slidably connected with the detection port 14 to perform puncture detection on the battery pack 5 inside the experimental tank 1.

[0022] Specific working process: fix the battery pack 5 to be tested to the inside of the experimental tank 1 through the fixed clamping assembly, in the middle position, and drive the locking device through the hydraulic cylinder configured on the switch door of the experimental tank 1 to realize the automatic closing of the switch door, so that the battery pack 5 to be tested inside the experimental tank 1 is in a closed state; then start the vacuum pump to draw the inert gas inside the connected inert gas tank into the experimental tank 1 and the gas collection tank 3, and release the natural air inside the experimental tank 1 and the gas collection tank 3 at the same time, so as to realize the replacement of the natural air inside the experimental tank 1 and the gas collection tank 3, and avoid the mixing of natural air resulting in inaccurate detection results of the collected gas component content; After the inert gas fills the interior of the test tank 1, the battery pack 5 to be tested in the test tank 1 is subjected to overcharging, overheating, and thermal runaway tests triggered by needle puncture. During this process, the temperature of the experimental environment inside the test tank 1 can be controlled by the temperature control chamber 11 and the circulating cooling system 12, so that the test items of the battery pack 5 to be tested can be realized under more comprehensive and diverse ambient temperature conditions, thereby making the experimental data richer and closer to reality. In a specific experimental project, for example, when conducting a needle-puncture-triggered thermal runaway experiment, the telescopic device connected to the experimental triggering steel needle 41 is started, and the experimental triggering steel needle 41 is pushed to slide along the corresponding detection port 14, inserted into the interior of the experimental tank 1 and contacted with the battery pack 5 to be tested, and the battery pack 5 to be tested is subjected to a needle-puncture test under different temperature conditions, and the test result data is obtained through the observation window on the outside of the experimental tank 1 and various detection sensors arranged inside; The overcharging system includes related devices of the existing battery overcharging test, which inflates the inside of the test tank 1 to provide air pressure, detects the performance of the battery pack 5 to be tested under high pressure, or inflates the inside of the battery pack 5 to be tested to observe the experimental performance; The temperature control chamber 11 provides different temperature conditions for the above-mentioned existing experimental test items, so that the experimental environment of the battery pack 5 to be tested is more diverse, close to the existing use environment, and the test accuracy is improved; Specifically, a temperature control chamber 11 is provided in the side wall of the experimental tank 1, and the interior of the temperature control chamber 11 can be filled with a heating medium, such as water; an existing heating control system is provided on the side wall of the temperature control chamber 11, and when the temperature needs to be increased, the heating medium is heated by external control, so that the heat is transferred to the internal experimental environment of the experimental tank 1 through the annularly surrounded temperature control chamber 11, thereby realizing the temperature increase control of the internal experimental environment of the experimental tank 1; when the temperature needs to be reduced, the heating control system is turned off, and the compressed water chiller in the circulating cooling system 12 is started, and the heat-conducting medium in the temperature control chamber 11 is connected to the circulating cooling system 12 through relevant pipelines, and the replacement of cold water causes the temperature control chamber 11 to cool down, thereby promoting the cooling of the interior of the experimental tank 1; In this way, the temperature of the experimental environment inside the experimental tank 1 is controlled, and the experimental data of the test items of the battery pack 5 under different temperature conditions are obtained, which increases the richness of the experimental data and provides data support for subsequent performance testing and improvement of lithium batteries. After the battery pack 5 releases gas due to thermal runaway, the internal air pressure of the experimental tank 1 increases. At this time, the gas generated by the experiment can be pumped into the gas collection tank 3 through a vacuum pump, and used as a sample for later analysis of the composition differences of the gas released by the battery pack 5 under different experimental items and different experimental conditions, so as to better evaluate the performance of the lithium battery under different working conditions.

[0023] Embodiment 2:

[0024] On the basis of the first embodiment, the gas collection tank 3 includes a tank body 31, a top cover 32, an air filling pipe 33 and an air outlet pipe 34. The air filling pipe 33 runs through the top cover 32 and communicates with the collection pipe 13. The air outlet pipe 34 is located at the bottom of the tank body 31 and communicates with the inside of the tank body 31. When the natural air inside the tank body 31 is emptied by filling with inert gas, the inert gas can be input from the top air filling pipe 33 and the air inside the tank body 31 can be output from the bottom air outlet pipe 34, thereby replacing the air inside the tank body 31. When the experimental gas is filled, the bottom air outlet pipe 34 is closed. When the experimental gas needs to be detected and analyzed for gas composition, the air outlet pipe 34 is opened to extract part of the experimental gas as a test sample, and the gas composition is analyzed using a detection instrument, and the data is recorded. A separation cylinder 6 is arranged on the lower surface of the top cover 32, and the area enclosed between the separation cylinder 6 and the top cover 32 is a separation chamber 61; the end of the inflation tube 33 extends into the separation chamber 61, and the side wall of the inflation tube 33 located inside the separation chamber 61 is evenly provided with air outlet holes 331, and the side wall of the separation cylinder 6 is evenly provided with release holes 62, and an annular separation net 63 is arranged in the area inside the separation chamber 61 between the air outlet holes 331 and the release holes 62.

[0025] Specific workflow: Based on the specific workflow in Example 1, when the battery pack 5 to be tested located inside the test tank 1 shows a tendency to expand and explode, the valve at the joint of the gas filling tank and the test tank 1 is opened to allow the inside of the test tank 1 and the gas collection tank 3 to communicate with each other; subsequently, when the battery pack 5 releases gas due to thermal runaway, on the one hand, the gas pressure inside the test tank 1 increases, causing the released gas to have a tendency to flow toward the gas collection tank 3; on the other hand, in order to more fully collect the gas released by the battery pack 5 during the experiment, the vacuum pump is started to pump the air inside the test tank 1 toward the gas collection tank 3, so that the gas released by the thermal runaway of the battery pack 5 is fully collected by the gas collection tank 3; Furthermore, in order to prevent the smoke residue impurities mixed in the air released by the battery pack 5 from flowing into the gas collection tank 3 through the inflation tube 33, the experimental gas sample collected in the gas collection tank 3 is mixed with the smoke residue impurities, which increases the difficulty of the specific component analysis of the experimental gas sample in the later stage, affects the accuracy of the gas component analysis, and the smoke residue impurities may adhere to the inner wall of the tank body 31 after flowing in, making it difficult to clean up in the later stage; and when the gas sample of the previous experiment needs to be emptied before the next experiment, the smoke residue impurities adhered to the inner wall of the tank body 31 need to be disassembled for cleaning, which is difficult to clean and affects the experimental efficiency; Therefore, the present application sets a separation cylinder 6 on the lower side of the top cover 32 of the tank body 31. The inflowing experimental gas first flows out through the gas outlet 331 set on the side wall of the end of the inflation tube 33 and enters the separation chamber 61. Then it needs to pass through the annular separation net 63 set in the separation chamber 61. The separation net 63 with a filter structure removes smoke residue impurities in the gas and realizes the separation of solid impurities in the gas. The purified gas flows out from the release holes 62 evenly set on the side wall of the separation cylinder 6 and enters the tank body 31 for storage. In order to improve the purification effect, a ring between the separation net 63 and the inner wall of the separation cylinder 6 can also be formed. The shaped gap area is filled with a purification filler, such as activated carbon; in this way, the gas needs to pass through the separation net 63 and the adsorbent material before it can flow out from the release hole 62, and the solid impurities mixed in the experimental gas are more fully separated, so that the experimental gas stored in the tank body 31 has fewer impurities, and the gas composition analysis is smoother in the later stage, thereby improving the accuracy of the experimental gas composition analysis; at the same time, when the experimental gas is collected and stored in this way, the pre-purified experimental gas has less impurities and dirt adhering to the inner wall of the tank body 31, and the frequency of cleaning the inner wall of the tank body 31 is reduced, thereby improving the experimental efficiency; Furthermore, the separation cylinder 6 is located on the lower side of the top cover 32. When the top cover 32 is removed, the separation cylinder 6 can be directly pulled out, which is convenient for cleaning the separation cylinder 6 from the outside, thereby improving the convenience of installing and cleaning the separation cylinder 6. The solid impurity components adhered to the separation net 63 can also be analyzed separately, and the components of solid impurities in the gas released by the battery pack 5 under different experimental projects and experimental conditions can be collected, so as to better evaluate the overheating and runaway situation of the battery pack 5 to be tested, and provide more abundant data support for the performance test and subsequent improvement of the battery pack 5.

[0026] Embodiment three:

[0027] On the basis of the second embodiment, a flushing chamber 321 is provided in the area inside the top cover 32 located on the upper side of the separation chamber 61. The flushing chamber 321 is communicated with the inside of the inflation tube 33 through a connecting hole 332 provided on the side wall of the inflation tube 33. The flushing holes 322 are evenly arranged at the bottom of the flushing chamber 321. The bottom opening of the flushing hole 322 points to the side surface of the separation net 63 close to the air outlet 331. A control valve 333 is provided in the area inside the inflation tube 33 between the connecting hole 332 and the air outlet 331. The control valve 333 is controlled by an external controller.

[0028] Specific working process: Based on the specific working process in Example 2, during normal ventilation, the control valve 333 located at the end of the inflation tube 33 is in an open state, so that the experimental gas flowing inside the inflation tube 33 can flow smoothly and pass through the outlet hole 331 at the end position; after working continuously for a period of time, considering that the continuous accumulation of smoke residue impurities adhering to the surface of the separation net 63 is likely to affect the permeability of the separation net 63, the operator can use the controller to timedly close the control valve 333 located at the end of the inflation tube 33, so that the experimental gas flowing toward the inside of the tank body 31 is intercepted by the control valve 333, and then flows into the inside of the flushing chamber 321 along the connecting hole 332, and then flows downward into the flushing chamber 321 along the flushing hole 322 at the bottom of the flushing chamber 321, and the surface of the separation net 63 inside the flushing chamber 321 is vertically flushed downward to clean; The smoke residue impurities adhered to the separation net 63 are loosened and fall off due to the vertical airflow scouring, and move toward the bottom of the separation chamber 61 under the action of airflow and gravity, and accumulate at the bottom, thereby achieving regular self-cleaning of the separation net 63, thereby improving the working condition of the separation net 63, reducing the possibility of blockage of the separation net 63 due to solid impurities accumulated on the separation net 63 and affecting the passage of experimental gas, and also reducing the frequency of manual disassembly and cleaning, thereby ensuring the normal functioning of the separation net 63, and further ensuring the smooth collection of the gas released by the battery pack 5 in the experimental project.

[0029] Embodiment 4:

[0030] On the basis of Example 3, the area at the bottom of the separation chamber 61 located at the lower side of the end of the inflation tube 33 is the collection chamber 64, and the collection chamber 64 is connected to the interior of the gas collection tank 3 through the leakage holes 641 evenly arranged at the bottom; an interception net 642 is arranged on the upper side of the leakage hole 641, and the cross-section of the interception net 642 is an inverted V-shape, extending in a ring shape around the central axis of the collection chamber 64, and the top opening of the leakage hole 641 is located in the area surrounded by the interception net 642, and the gap area between adjacent interception nets 642 is filled with dust-absorbing material, and a loose structure formed by chemical fibers entangled with each other can be selected to facilitate the penetration of contacting gas, and the dust-absorbing material is filled into the gap area between the interception nets 642, and a mesh structure is laid on the top for limiting and fixing.

[0031] Specific working process: Based on the specific working process in the third embodiment, after the control valve 333 is closed, the downwardly flowing gas flows downward along the annular gap area between the separation net 63 and the inflation tube 33, flushing the soot impurities adhered to the surface of the separation net 63 and blowing them toward the direction close to the bottom collection chamber 64; Leakage holes 641 are evenly arranged at the bottom of the separation chamber 61, so the gas flowing downward passes through the interception net 642 and then flows out from the leakage holes 641, while the impurities mixed in the gas and cleaned up are retained on the upper surface of the interception net 642; because the interception net 642 is an inverted V-shape, when the downward gas contacts the interception net 642, a part of it directly passes through the interception net 642 and passes through the leakage holes 641 on the lower side, and the other part is guided by the inclined surfaces on both sides of the interception net 642, contacts the dust-absorbing material filled in the recessed gap between the interception nets 642, and penetrates through the gap between the dust-absorbing material from both sides of the interception net 642, and then flows out from the leakage holes 641. In this process, the gas flowing along the inclined surface of the interception net 642 also drives the impurities adhered to the outer surface of the interception net 642 to move toward the recessed gap between the interception nets 642, thereby ensuring the passability of the interception net 642 itself; When the soot impurities come into contact with the ash-absorbing material in the gap area between the intercepting net 642, the falling soot impurities are adhered to the surface of the ash-absorbing material, thereby effectively limiting them, preventing the separated impurities from being lifted up again due to the airflow and affecting the permeability of the intercepting net 642 and the separation net 63. In this way, the separated solid impurities are effectively limited, reducing the obstruction to the gas when passing through the separation net 63, and making the purification of the experimental gas flowing into the tank body 31 smoother.

[0032] Embodiment five:

[0033] On the basis of the fourth embodiment, a cleaning ring 65 is slidably provided in the annular gap area between the separation net 63 and the inflation tube 33, and the cleaning ring 65 is connected to the driving rod 651. The top of the driving rod 651 slides upward through the flushing hole 322 and is connected to the output end of the pushing device on the upper side of the flushing chamber 321. The output end is controlled by an external controller, and the pushing device here can be a miniature electric telescopic rod device; the diameter of the driving rod 651 is smaller than the flushing hole 322, and the cleaning ring 65 is in contact with the surface of the side of the separation net 63 close to the air outlet 331; the upper surface of the cleaning ring 65 is an inclined surface, and the outer circular end of the cleaning ring 65 close to the surface of the separation net 63 is evenly provided with cleaning grooves 652, and the inner surface of the cleaning groove 652 is evenly provided with bristles; the interior of the cleaning ring 65 is hollow and communicates with the interior of the separation chamber 61 through the supplementary hole 653 set on the top, and the inner wall of the cleaning groove 652 is provided with an impact hole 654, which is located in the gap between the bristles and communicates with the hollow part inside the cleaning ring 65.

[0034] Specific workflow: Based on the specific workflow in Example 4, in the initial state, the cleaning ring 65 is located at the top of the separation chamber 61 and in the gap area between the separation net 63 and the inflation tube 33; when the separation net 63 needs to be cleaned regularly, the control valve 333 at the end of the inflation tube 33 is closed and the propulsion device is started to drive the cleaning ring 65 to move vertically downward. The outer ring end of the cleaning ring 65 close to the separation net 63 is evenly provided with cleaning grooves 652, and the inner wall of the cleaning groove 652 is provided with bristles, and the bristles are in contact with the surface of the separation net 63. As the cleaning ring 65 moves downward vertically, the bristles on the outer end of the cleaning ring 65 slide downward along the surface of the separation net 63, scraping and cleaning the outer surface of the separation net 63, causing the impurities that are tightly adhered to the surface of the separation net 63 to fall off under the scraping effect; and the gas flowing downward through the flushing hole 322 is blocked by the cleaning ring 65 and will be concentrated and accelerated to pass through the cleaning groove 652, so that the bristles and the separation net 63 corresponding to the cleaning groove 652 are flushed by the concentrated airflow, and the impurities and smoke residues cleaned up are taken away; Because the driving rod 651 connected to the cleaning ring 65 passes through the flushing hole 322, while the inside of the flushing hole 322 is being cleared and cleaned, the gas flowing into the flushing cavity 321 contacts the cleaning ring 65 when flowing downward along the separation cavity 61 through the gap between the flushing hole 322 and the driving rod 651, and then flows toward the contact gap between the bristles and the cleaning ring 65 under the guidance of the upper inclined surface of the cleaning ring 65. While passing through the contact gap, the surface of the separation net 63 in the contact gap is effectively flushed and cleaned, thereby ensuring that the impurities scraped and cleaned by the bristles are promptly taken away by the airflow passing through the gap; Furthermore, part of the gas in contact with the upper surface of the cleaning ring 65 flows into the hollow part inside the cleaning ring 65 through the supplementary hole 653, and then flows out through the impact hole 654 on the inner wall of the cleaning groove 652, flushing and cleaning from the inside to the outside along the gaps between the bristles, so that the bristles themselves are combed by the airflow, and the cigarette residue impurities adhered to the bristles fall off and separate, and fall into the collection chamber 64 at the bottom with the gas, thereby ensuring the normal operation of the cleaning ring 65.

[0035] Embodiment six:

[0036] On the basis of the fifth embodiment, the separation cylinder 6 includes a separation portion 66 and a drainage portion 67, the separation portion 66 and the drainage portion 67 are separated from each other, and a limiting ring 671 arranged at the top of the drainage portion 67 is slidably embedded in a limiting slide groove 661 arranged at the bottom of the separation portion 66, and the limiting ring 671 is connected to the inner wall of the limiting slide groove 661 through an elastic member; The separation net 63 is made of elastic material, and the part of the separation net 63 facing the air outlet 331 protrudes toward the opening of the air outlet 331 to form a vibration part 631 with an annular protruding structure. The vertical cross-section of the vibration part 631 is an arc-shaped structure, and the top of the separation net 63 is connected to the inner wall of the top of the separation part 66, and the bottom of the separation net 63 is connected to the inner wall of the discharge part 67.

[0037] Specific working process: Based on the specific working process in Example 5, the separation cylinder 6 and the internal collection chamber 64 are divided into two relatively independent parts, the separation part 66 and the discharge part 67, and the separation part 66 and the discharge part 67 are elastically connected; when the control valve 333 is closed, the gas flows downward to impact the inner wall of the collection chamber 64 at the bottom, so that the discharge part 67 corresponding to the collection chamber 64 is forced to slide downward, and the distance between the upper separation part 66 is increased, and the annular limit ring 671 limits the movement trajectory of the discharge part 67 and prevents the internal gas from directly flowing out from the gap between the separation part 66 and the discharge part 67; the movement of the discharge part 67 causes the separation net 63 and the ash absorption material to vibrate, thereby causing the smoke residue impurities adhering to the separation net 63 to fall faster, and the impurities adsorbed by the ash absorption material are also mixed evenly with the ash absorption material under the action of vibration, and penetrate into the interior of the ash absorption material; and the vibration action causes the ash absorption material to remain loose, thereby ensuring the permeability of the contact gas; Furthermore, because arc-shaped vibration parts 631 are evenly arranged on the separation net 63, the vertical section of the separation net 63 presents a continuous bending structure. When the gas flowing out laterally impacts the surface of the vibration part 631, the arc surface causes the gas to flow toward both sides, thereby forming a tangential flushing effect on the surface of the vibration part 631, preventing the accumulation of eye residue impurities in the gas on the surface of the vibration part 631, thereby ensuring the passability of the vibration part 631; and when the cleaning ring 65 moves vertically through the vibration part 631, the end of the cleaning ring 65 squeezes and impacts the surface of the vibration part 631, causing the elastic separation net 63 to vibrate more, thereby causing the accumulated smoke residue impurities adhering to the surface of the separation net 63 to fall off faster; As the separation part 66 and the discharge part 67 separate, the two ends of the separation net 63 are pulled respectively, and the bent parts corresponding to the vibration part 631 are straightened, providing a margin for the elongation and deformation of the separation net 63. In the process of the separation net 63 being pulled and deformed, the vibration of the separation net 63 itself accelerates the falling off of the smoke residue impurities adhered to the surface, and falls to the collection chamber 64 at the bottom to be recovered and limited, thereby ensuring the passability of the separation net 63 and making the recovery of the experimental gas smoother.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A lithium battery gas release collection and detection integrated machine, characterized in that: The invention comprises an experimental tank (1), a control body (2), an inert gas tank, a gas collection tank (3) and an experimental device. The battery pack (5) to be tested is fixed to a middle position inside the experimental tank (1) by a fixed clamping assembly; the inert gas tank is in communication with the inside of the experimental tank (1) and the gas collection tank (3); the control body (2) is equipped with an operating software system for controlling various components to detect the battery pack (5) to be tested; The experimental device comprises an overcharging system and a heating puncture mechanism (4) for testing a battery pack (5) to be tested and transmitting the test data to a display interface of a control body (2); The side wall of the experimental tank (1) is provided with an annular temperature control chamber (11), and the temperature control chamber (11) is connected to a circulating cooling system (12) for controlling the experimental temperature inside the experimental tank (1); The experimental tank (1) is connected to the gas collection tank (3) through a collection tube (13), and the experimental triggering steel needle (41) of the heating puncture mechanism (4) passes through the detection port (14) at the end of the experimental tank (1) and is slidably connected to the detection port (14) to perform puncture detection on the battery pack (5) inside the experimental tank (1).

2. The lithium battery gas release collection and detection integrated machine according to claim 1, characterized in that: The gas collection tank (3) comprises a tank body (31), a top cover (32), an air charging pipe (33) and an air outlet pipe (34); the air charging pipe (33) passes through the top cover (32) and communicates with the collection pipe (13); the air outlet pipe (34) is located at the bottom of the tank body (31) and communicates with the interior of the tank body (31); A separation cylinder (6) is arranged on the lower surface of the top cover (32), and the area enclosed between the separation cylinder (6) and the top cover (32) is a separation chamber (61); the end of the inflation tube (33) extends into the interior of the separation chamber (61), and the side wall of the inflation tube (33) located inside the separation chamber (61) is evenly provided with air outlet holes (331), the side wall of the separation cylinder (6) is evenly provided with release holes (62), and an annular separation net (63) is arranged in the area inside the separation chamber (61) between the air outlet holes (331) and the release holes (62).

3. The lithium battery gas release collection and detection integrated machine according to claim 2, characterized in that: A flushing chamber (321) is arranged in the area inside the top cover (32) located on the upper side of the separation chamber (61); the flushing chamber (321) is communicated with the inside of the inflation tube (33) through a connecting hole (332) arranged on the side wall of the inflation tube (33); flushing holes (322) are evenly arranged at the bottom of the flushing chamber (321); the bottom openings of the flushing holes (322) point to a side surface of the separation net (63) close to the air outlet hole (331).

4. The lithium battery gas release collection and detection integrated machine according to claim 3, characterized in that: A control valve (333) is provided in the area between the communication hole (332) and the air outlet hole (331) inside the inflation tube (33), and the control valve (333) is controlled by an external controller.

5. The lithium battery gas release collection and detection integrated machine according to claim 3, characterized in that: The area at the bottom of the separation chamber (61) located below the end of the inflation tube (33) is the collection chamber (64), and the collection chamber (64) is connected to the interior of the gas collection tank (3) through leakage holes (641) evenly arranged at the bottom; an interception net (642) is arranged on the upper side of the leakage hole (641), and the cross-section of the interception net (642) is an inverted V-shaped and extends in a ring shape around the central axis of the collection chamber (64); the top opening of the leakage hole (641) is located in the area surrounded by the interception net (642), and the gap area between adjacent interception nets (642) is filled with dust-absorbing material.

6. The lithium battery gas release collection and detection integrated machine according to claim 5, characterized in that: A cleaning ring (65) is slidably provided in the annular gap area between the separation net (63) and the inflation tube (33), and the cleaning ring (65) is connected to a driving rod (651). The top of the driving rod (651) slides upward through the flushing hole (322) and is connected to the output end of a pushing device on the upper side of the flushing chamber (321), and the pushing device is controlled by an external controller; the diameter of the driving rod (651) is smaller than the flushing hole (322), and the cleaning ring (65) is in contact with the surface of the separation net (63) on one side close to the air outlet (331).

7. The lithium battery gas release collection and detection integrated machine according to claim 6, characterized in that: The upper surface of the cleaning ring (65) is an inclined surface, and cleaning grooves (652) are evenly arranged on the outer circular end of the cleaning ring (65) close to the surface of the separation net (63), and bristles are evenly arranged on the inner surface of the cleaning grooves (652).

8. The lithium battery gas release collection and detection integrated machine according to claim 7, characterized in that: The cleaning ring (65) is hollow inside and communicates with the interior of the separation chamber (61) through a supplementary hole (653) arranged at the top; an impact hole (654) is arranged on the inner wall of the cleaning groove (652); the impact hole (654) is located in the gap between the bristles and communicates with the hollow part inside the cleaning ring (65).

9. The lithium battery gas release collection and detection integrated machine according to claim 8, characterized in that: The separation cylinder (6) comprises a separation portion (66) and a discharge portion (67), wherein the separation portion (66) and the discharge portion (67) are separated from each other, and a limiting ring (671) arranged at the top of the discharge portion (67) is slidably embedded in a limiting sliding groove (661) arranged at the bottom of the separation portion (66), and the limiting ring (671) is connected to the inner wall of the limiting sliding groove (661) via an elastic member.

10. The lithium battery gas release collection and detection integrated machine according to claim 9, characterized in that: The separation net (63) is made of elastic material, and the portion of the separation net (63) facing the air outlet (331) is convex toward the opening direction of the air outlet (331), forming a vibration part (631) with an annular convex structure, the vertical cross-section of the vibration part (631) is an arc-shaped structure, and the top of the separation net (63) is connected to the inner wall of the top of the separation part (66), and the bottom of the separation net (63) is connected to the inner wall of the discharge part (67).

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