A lithium battery gas release collection and detection integrated machine

Abstract

The present invention belongs to the technical field of battery detection, and specifically relates to an integrated machine for detecting and collecting gas released from lithium batteries, which includes an experimental 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 experimental tank through a fixed clamping assembly; the inert gas tank is internally communicated with the experimental tank and the gas collection tank, and the control body is equipped with an operation software system for controlling each component to detect the battery pack to be tested; by arranging a temperature control cavity in the side wall of the experimental tank, the temperature control cavity can be filled with a heating medium, and the side wall of the temperature control cavity 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 for the battery pack under different temperature conditions, increase the richness of the experimental data, and provide data support for the performance test and improvement of subsequent lithium batteries.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery detection, and specifically relates to an integrated machine for detecting gas release and collection of lithium batteries. 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, lithium-ion power batteries, as an essential power supply component for electric vehicles, are also in high demand. However, during the use of the battery, due to countless charge and discharge cycles, it may experience a thermal runaway effect. During the runaway, the battery will generate high temperature and a large amount of harmful gases, and in severe cases, it will cause fire or even explosion. Therefore, it is particularly important to conduct safety performance tests on lithium batteries to ensure their factory safety.

[0003] Currently, the market conducts overcharge, overheat, needle puncture, extrusion and other test detections by simulating the triggering of thermal runaway. However, most current test equipment only has a single test function, and the gas generated by thermal runaway is only discharged through a gas treatment device. There is no way to know what kind of harm the gas generated by the battery abnormality will cause to the environment and human body. Therefore, it is necessary to study a detection device with good sealing characteristics that integrates overcharge, overheat, needle puncture, and gas collection to collect the gas and smoke generated when the battery is abnormal for gas harmful analysis by a gas analysis device.

[0004] There are various gas collection devices on the market. Generally, fire is used to generate smoke, and then a smoking device is used to extract the smoke of the battery fire. The extracted smoke gas is mixed, and the data analysis has a large difference. Moreover, it can only provide a single temperature condition, that is, a thermal runaway trigger experiment is carried out on the battery pack at room temperature, and the collection is carried out after the thermal runaway ends and cools down 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 provides an integrated machine for detecting gas release and collection of lithium batteries, including an experimental 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 experimental tank through a fixed clamping component; the inert gas tank is internally communicated with the experimental tank and the gas collection tank, and the control body is equipped with an operation software system to control each component to detect the battery pack to be tested;

[0006] The experimental device includes an overcharge system and a heating and needle 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;

[0007] An annular temperature control chamber is provided on the side wall of the experimental tank, and the temperature control chamber is connected to a circulating cooling system for controlling the experimental temperature inside the experimental tank;

[0008] The experimental tank communicates with the gas collection tank through a collection pipe, and the experimental trigger steel needle of the heating needle punching mechanism passes through the detection port at the end of the experimental tank and is slidably connected to the detection port for performing a needle punching test on the battery pack inside the experimental tank.

[0009] Preferably, the gas collection tank includes a tank body, a top cover, a charging pipe, and an air outlet pipe. The charging pipe penetrates through the top cover and communicates with the collection pipe. The air outlet pipe is located at the bottom of the tank body and communicates with the inside of the tank body;

[0010] A separation cylinder is provided on the lower surface of the top cover. The area surrounded between the separation cylinder and the top cover is a separation chamber; the end of the charging pipe extends into the separation chamber, and air outlet holes are uniformly provided on the side wall of the charging pipe located inside the separation chamber. Release holes are uniformly provided on the side wall of the separation cylinder. An annular separation net is provided in the area between the air outlet holes and the release holes inside the separation chamber.

[0011] Preferably, a flushing chamber is provided in the area above the separation chamber inside the top cover. The flushing chamber communicates with the inside of the charging pipe through a communication hole provided on the side wall of the charging pipe. Flushing holes are uniformly provided at the bottom of the flushing chamber, and the bottom openings of the flushing holes point to the surface of the separation net close to the air outlet holes.

[0012] Preferably, a control valve is provided in the area between the communication hole and the air outlet hole inside the charging pipe, and the control valve is controlled by an external controller.

[0013] Preferably, the area at the bottom of the separation chamber below the end of the charging pipe is a collection chamber. The collection chamber communicates with the inside of the gas collection tank through drain holes uniformly provided at the bottom; an interception net is provided above the drain holes. The cross section of the interception net is an inverted V shape and extends annularly around the central axis of the collection chamber; the top openings of the drain holes are located in the area surrounded by the interception net, and the gap areas between adjacent interception nets are filled with dust-absorbing materials.

[0014] Preferably, a cleaning ring is slidably arranged in the annular gap area between the separation net and the charging pipe. The cleaning ring is connected to a driving rod. The top of the driving rod slides upward through the flushing hole and is connected to the output end of a pushing device above the flushing chamber. The pushing device is controlled by an external controller; the diameter of the driving rod is smaller than that of the flushing hole, and the cleaning ring is in contact with the surface of the separation net close to the air outlet holes.

[0015] Preferably, the upper surface of the cleaning ring is an inclined surface, and cleaning grooves are uniformly arranged on the outer circular end of the cleaning ring close to the surface of the separation net, and bristles are uniformly arranged on the inner surface of the cleaning grooves.

[0016] Preferably, the inside of the cleaning ring is hollow and communicates with the inside of the separation chamber through a replenishing hole provided at the top. Impact holes are provided on the inner wall of the cleaning groove. The impact holes are located in the gaps between the bristles and communicate with the hollow part inside the cleaning ring.

[0017] Preferably, the separation cylinder includes a separation part and a flow-discharging part. The separation part and the flow-discharging part are separated from each other, and a limiting ring provided at the top of the flow-discharging part is slidably inserted into a limiting sliding groove provided at the bottom of the separation part. An elastic member is connected between the limiting ring and the inner wall of the limiting sliding groove.

[0018] Preferably, the separation net is made of an elastic material, and the part of the separation net facing the air outlet protrudes towards the opening direction of the air outlet, forming a vibrating part with an annular convex structure. The vertical 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 flow-discharging part.

[0019] The beneficial effects of the present invention are as follows:

[0020] For the lithium battery gas release collection and detection integrated machine of the present invention, by providing a temperature control cavity in the side wall of the experimental tank, the inside of the temperature control cavity can be filled with a heating medium, and an existing heating control system is provided on the side wall of the temperature control cavity to realize the temperature control of the experimental environment inside the experimental tank, obtain the experimental data of the test items on 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;

[0021] After the battery pack has a thermal runaway and releases gas, 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 by a vacuum pump, serving as a sample for analyzing the component differences of the gas released by the battery pack under different experimental items and different experimental conditions, so as to better evaluate the performance of the lithium battery under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 is a perspective view of the present invention;

[0024] Figure 2 is a front view of the present invention;

[0025] Figure 3 is a schematic diagram of the cooperation between the experimental tank and the heating acupuncture mechanism in the present invention;

[0026] Figure 4 is a cross-sectional view of the gas collection tank in the present invention;

[0027] Figure 5 is Figure 4 a partial enlarged view of location A in

[0028] Figure 6 is Figure 5 a partial enlarged view of location B in

[0029] Figure 7 is Figure 5 a partial enlarged view of location C in

[0030] In the figure: experimental tank 1, temperature control cavity 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 cavity 321, flushing hole 322, gas filling tube 33, air outlet hole 331, communication hole 332, control valve 333, air outlet pipe 34, heating needle mechanism 4, experimental trigger steel needle 41, battery pack 5, separation cylinder 6, separation cavity 61, release hole 62, separation net 63, vibration part 631, collection cavity 64, drain hole 641, interception net 642, cleaning ring 65, drive rod 651, cleaning groove 652, replenishing hole 653, impact hole 654, separation part 66, limit sliding groove 661, drain part 67, limit ring 671. Specific embodiments

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment 1:

[0033] Based on the fact that existing lithium battery detection equipment can only provide a single temperature condition, that is, conducting a thermal runaway trigger experiment on the battery pack 5 at room temperature, and waiting until the thermal runaway ends and cools down to room temperature before collection. Frequent use may lead to inaccurate detection of gas component content;

[0034] To effectively solve the above problems, as shown in the accompanying drawings of the specification Figures 1-7As shown in the figure, the present application proposes a lithium battery gas release collection and detection integrated machine, which includes 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 through a fixed clamping assembly; the inert gas tank is internally communicated with the experimental tank 1 and the gas collection tank 3, and the control body 2 is equipped with an operating software system for controlling each component to detect the battery pack 5 to be tested;

[0035] The experimental device includes an overcharge system and a heating and acupuncture mechanism 4 for detecting the battery pack 5 to be tested and transmitting the detection data to the display interface of the control body 2;

[0036] The side wall of the experimental tank 1 is provided with an annular temperature control cavity 11, and the temperature control cavity 11 is connected to a circulating cooling system 12 for controlling the experimental temperature inside the experimental tank 1 and providing diverse temperature experimental conditions;

[0037] The experimental tank 1 is communicated with the gas collection tank 3 through a collection pipe 13. A plurality of detection ports 14 are respectively arranged on both sides of the experimental tank 1, and the experimental trigger steel needle 41 of the heating and acupuncture mechanism 4 passes through the detection port 14 at one end of the experimental tank 1 and is slidably connected to the detection port 14 for acupuncture detection of the battery pack 5 inside the experimental tank 1.

[0038] Specific working process: Fix the battery pack 5 to be tested to the inside of the experimental tank 1 through the fixed clamping assembly at the middle position. 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 pump the inert gas inside the connected inert gas tank into the experimental tank 1 and the gas collection tank 3, and at the same time release the natural air inside the experimental tank 1 and the gas collection tank 3, so as to realize the replacement of the natural air inside the experimental tank 1 and the gas collection tank 3 and avoid inaccurate detection results of the gas component content caused by the mixing of natural air;

[0039] After the inert gas fills the inside of the experimental tank 1, start to conduct test items such as overcharge, overheat and acupuncture-triggered thermal runaway experiments on the battery pack 5 to be tested inside the experimental tank 1; during this process, the temperature of the experimental environment inside the experimental tank 1 can be controlled through the temperature control cavity 11 and the circulating cooling system 12, so as to realize the test items for the battery pack 5 to be tested under more comprehensive and diverse environmental temperature conditions, making the experimental data richer and closer to reality;

[0040] In a specific experimental project, for example, when conducting a thermal runaway experiment by acupuncture, the telescopic device connected to the experimental trigger steel needle 41 is activated to push the experimental trigger steel needle 41 to slide along the corresponding detection port 14, extend into the experimental tank 1 and contact the battery pack 5 to be tested therein. The battery pack 5 to be tested is subjected to acupuncture tests under different temperature conditions, and the test result data is obtained through the observation window on the outer side of the experimental tank 1 and various detection sensors arranged inside;

[0041] The overcharge system includes relevant devices for existing battery overcharge tests, provides air pressure by inflating the inside of the experimental tank 1, 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;

[0042] The temperature control cavity 11 provides different temperature conditions for the above-mentioned existing experimental test items, making the experimental environment of the battery pack 5 to be tested more diverse, closer to the existing usage environment, and improving the test accuracy;

[0043] Specifically, a temperature control cavity 11 is provided in the side wall of the experimental tank 1. The inside of the temperature control cavity 11 can be filled with a heating medium, such as water; the side wall of the temperature control cavity 11 is provided with an existing heating control system. When it is necessary to raise the temperature, the heating medium is heated through external control, so that the heat is transferred to the experimental environment inside the experimental tank 1 through the annularly surrounded temperature control cavity 11 to realize the temperature increase control of the experimental environment inside the experimental tank 1; when it is necessary to lower the temperature, the heating control system is turned off, and the compression chiller in the circulating cooling system 12 is started. The heat-conducting medium inside the temperature control cavity 11 is connected to the circulating cooling system 12 through relevant pipelines. The replacement of cold water cools the temperature control cavity 11, thereby promoting the cooling of the inside of the experimental tank 1;

[0044] In this way, the temperature control of the experimental environment inside the experimental tank 1 is realized, and the experimental data of the test items on the battery pack 5 under different temperature conditions is obtained, increasing the richness of the experimental data, and providing data support for the performance test and improvement of the subsequent lithium battery;

[0045] After the battery pack 5 experiences thermal runaway and releases gas, the air pressure inside the experimental tank 1 increases. At this time, the gas generated by the experiment can be pumped into the gas collection tank 3 by a vacuum pump, serving as a sample for later analysis of the component differences of the gas released by the battery pack 5 under different experimental projects and different experimental conditions, so as to better evaluate the performance of the lithium battery under different working conditions.

[0046] Embodiment 2:

[0047] On the basis of the first embodiment, the gas collection tank 3 includes a tank body 31, a top cover 32, a charging pipe 33, and an air outlet pipe 34. The charging pipe 33 penetrates 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 filling the inert gas to evacuate the natural air inside the tank body 31, the inert gas can be input from the top charging pipe 33, and the air inside the tank body 31 can be output from the bottom air outlet pipe 34, so as to realize the replacement of the air inside the tank body 31. When filling the experimental gas, the air outlet pipe 34 at the bottom is closed. When it is necessary to detect and analyze the gas components of the experimental gas, the air outlet pipe 34 is opened to extract part of the experimental gas as a detection sample, and a detection instrument is used to analyze the gas components and record the data.

[0048] A separation cylinder 6 is provided on the lower surface of the top cover 32. The area surrounded between the separation cylinder 6 and the top cover 32 is a separation chamber 61. The end of the charging pipe 33 extends into the separation chamber 61, and the side wall of the charging pipe 33 located inside the separation chamber 61 is uniformly provided with air outlet holes 331. The side wall of the separation cylinder 6 is uniformly provided with release holes 62. An annular separation net 63 is arranged in the separation chamber 61 in the area between the air outlet holes 331 and the release holes 62.

[0049] Specific working process: On the basis of the specific working process in the first embodiment, when the battery pack 5 to be tested inside the experimental tank 1 shows a tendency of expansion and explosion, the valve at the joint of the charging tank and the experimental tank 1 is opened to make the inside of the experimental tank 1 communicate with the inside of the gas collection tank 3. Subsequently, when the battery pack 5 releases gas due to thermal runaway, on the one hand, because the air pressure inside the experimental tank 1 increases, the released gas has a tendency to flow towards the gas collection tank 3. On the other hand, in order to collect more fully the gas released by the battery pack 5 during the experiment, the vacuum pump is started to pump the air inside the experimental tank 1 towards 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.

[0050] Furthermore, in order to prevent the smoke and slag impurities mixed in the air released by the battery pack 5 from flowing into the gas collection tank 3 through the charging pipe 33, which will cause the experimental gas sample collected inside the gas collection tank 3 to be mixed with smoke and slag impurities, increasing the difficulty of analyzing the specific components of the experimental gas sample in the later stage and affecting the accuracy of gas component analysis. And after the smoke and slag impurities flow in, they may adhere to the inner wall of the tank body 31, causing difficulties in later cleaning. And when it is necessary to empty the gas sample of the previous experiment before the next experiment, for the smoke and slag impurities adhering to the inner wall of the tank body 31, it is necessary to disassemble and clean, and the cleaning difficulty is relatively large, which affects the experimental efficiency.

[0051] Therefore, in the present application, a separation cylinder 6 is provided on the lower side of the top cover 32 of the tank body 31. The inflowing experimental gas first flows out through the air outlet holes 331 provided on the side wall of the end of the gas charging pipe 33 and enters the separation chamber 61. Subsequently, it needs to pass through the annular separation net 63 provided in the separation chamber 61. The separation net 63 with a filter structure removes the soot and impurities in the gas, realizing the separation of solid impurities in the gas. The purified gas flows out from the release holes 62 uniformly provided on the side wall of the separation cylinder 6 and enters the inside of the tank body 31 for storage. To improve the purification effect, purification fillers, such as activated carbon, can also be filled in the annular gap area between the separation net 63 and the inner wall of the separation cylinder 6. In this way, the gas needs to pass through the separation net 63 and the adsorption material before flowing out from the release holes 62, more fully separating the solid impurities mixed in the experimental gas, so that there are fewer impurities in the experimental gas stored inside the tank body 31, making the gas composition analysis more smooth in the later stage and improving the accuracy of the gas composition analysis of the experimental gas. At the same time, when collecting and storing the experimental gas in this way, there are also fewer impurities and dirt adhering to the inner wall of the tank body 31 by the pre-purified experimental gas, reducing the operation frequency of cleaning the inner wall of the tank body 31 and improving the experimental efficiency;

[0052] 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, facilitating the cleaning of the separation cylinder 6 outside the tank body and improving the convenience of installation and cleaning of the separation cylinder 6. It is also possible to separately analyze the components of the solid impurities adhering to the separation net 63, collect the components of the solid impurities in the gas released by the battery pack 5 under different experimental items and experimental conditions, so as to better evaluate the thermal runaway situation of the battery pack 5 to be tested and provide richer data support for the performance test and later improvement of the battery pack 5.

[0053] Embodiment Three:

[0054] On the basis of Embodiment Two, a flushing chamber 321 is provided in the area of the top cover 32 above the separation chamber 61. The flushing chamber 321 communicates with the inside of the gas charging pipe 33 through the communication holes 332 provided on the side wall of the gas charging pipe 33. Flushing holes 322 are uniformly provided at the bottom of the flushing chamber 321, and the bottom openings of the flushing holes 322 point to the surface of the separation net 63 close to the air outlet holes 331. A control valve 333 is provided in the area between the communication holes 332 and the air outlet holes 331 inside the gas charging pipe 33, and the control valve 333 is controlled by an external controller.

[0055] Specific working process: Based on the specific working process in the second embodiment, during normal ventilation, the control valve 333 located at the end of the charging pipe 33 is in an open state, enabling the experimental gas flowing inside the charging pipe 33 to flow smoothly and exit through the air outlet holes 331 at the end position. After continuous operation for a period of time, considering that the soot and impurity adhered to the surface of the separation net 63 accumulate continuously and easily affect the permeability of the separation net 63, the operator can close the control valve 333 at the end of the charging pipe 33 regularly through the controller. After the experimental gas flowing into the tank body 31 is intercepted by the control valve 333, it will concentrate and flow into the flushing chamber 321 along the communication holes 332, and then flow downward into the flushing chamber 321 along the flushing holes 322 at the bottom of the flushing chamber 321, and vertically flush and clean the surface of the separation net 63 inside the flushing chamber 321.

[0056] The soot and impurities adhered to the separation net 63 are loosened and detached due to the vertical airflow flushing effect, and move towards the bottom of the separation chamber 61 under the action of the airflow and gravity, and accumulate at the bottom. In this way, the separation net 63 is self-cleaned regularly, thus improving the working condition of the separation net 63, reducing the situation that the separation net 63 is blocked due to the solid impurities accumulated on the separation net 63 and affecting the passage of the experimental gas, and also reducing the frequency of manual disassembly and cleaning, ensuring the normal function of the separation net 63, and further ensuring the smooth collection of the gas released by the battery pack 5 in the experimental project.

[0057] Embodiment 4:

[0058] Based on the third embodiment, the area at the bottom of the separation chamber 61 and below the end of the charging pipe 33 is the collection chamber 64. The collection chamber 64 is communicated with the inside of the gas collection tank 3 through drain holes 641 uniformly arranged at the bottom. An interception net 642 is arranged above the drain holes 641. The cross-section of the interception net 642 is an inverted V shape, extending annularly around the central axis of the collection chamber 64, and the top opening of the drain hole 641 is located in the area surrounded by the interception net 642. The gap area between adjacent interception nets 642 is filled with dust-absorbing material, which can be a loose structure formed by winding chemical fibers with each other to facilitate the penetration of the contacting gas. 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.

[0059] Specific working process: Based on the specific working process in the third embodiment, after the control valve 333 is closed, when the gas flowing downward flows downward along the annular gap area between the separation net 63 and the charging pipe 33, it flushes the soot and impurities adhered to the surface of the separation net 63 and blows them towards the direction close to the bottom collection chamber 64.

[0060] The bottom of the separation chamber 61 is evenly provided with drain holes 641. Therefore, the gas flowing downward passes through the interception net 642 and flows out from the drain holes 641, while the impurities cleaned and mixed in the gas are left on the upper surface of the interception net 642. Since the interception net 642 is in 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 drain holes 641 on the lower side, and the other part is guided by the inclined surfaces on both sides of the interception net 642 and contacts the dust-absorbing material filled in the concave gap part between the interception net 642 and the interception net 642, and penetrates through the dust-absorbing material gap from both sides of the interception net 642 and then flows out from the drain holes 641. During 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 towards the concave gap direction between the interception nets 642, thus ensuring the permeability of the interception net 642 itself;

[0061] When the dust and slag impurities contact the dust-absorbing material in the gap area between the interception net 642, the falling dust and slag impurities are adhered to the surface of the dust-absorbing material, so as to effectively limit their position, and avoid the separated impurities from being lifted again due to the airflow effect, which affects the permeability of the interception net 642 and the separation net 63. In this way, the separated solid impurities are effectively limited, and the obstruction of the gas passing through the separation net 63 is reduced, making the purification of the experimental gas flowing into the tank body 31 more smooth.

[0062] Example Five:

[0063] On the basis of Example Four, a cleaning ring 65 is slidably arranged in the annular gap area between the separation net 63 and the gas charging pipe 33. 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 the pushing device on the upper side of the flushing chamber 321. The output end is controlled by an external controller. Here, the propulsion device can be a miniature electric telescopic rod device; the diameter of the driving rod 651 is smaller than that of the flushing hole 322, and the cleaning ring 65 contacts the surface of the separation net 63 close to the air outlet 331; 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. Brush hairs are evenly arranged on the inner surface of the cleaning grooves 652; the inside of the cleaning ring 65 is hollow and communicates with the inside of the separation chamber 61 through a replenishing hole 653 arranged at the top. Impact holes 654 are arranged on the inner wall of the cleaning grooves 652. The impact holes 654 are located in the gaps between the brush hairs and communicate with the hollow part inside the cleaning ring 65.

[0064] Specific working process: On the basis of the specific working process in the fourth embodiment, 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 mesh 63 and the charging pipe 33; when it is necessary to clean the separation mesh 63 regularly, while closing the control valve 333 at the end of the charging pipe 33, start the propulsion device to drive the cleaning ring 65 to move vertically downward. The outer ring end of the cleaning ring 65 close to the separation mesh 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 mesh 63; as the cleaning ring 65 moves vertically downward, the bristles on the outer ring end of the cleaning ring 65 slide downward along the surface of the separation mesh 63 while scraping and cleaning the outer surface of the separation mesh 63, prompting the impurities tightly adhered to the surface of the separation mesh 63 to also fall off under the scraping action; and the gas flowing downward through the flushing holes 322 will be blocked by the cleaning ring 65 and concentrated to accelerate through the cleaning groove 652, so that the bristles corresponding to the cleaning groove 652 and the separation mesh 63 are flushed by the concentrated air flow, and the cleaned impurity soot is carried away;

[0065] Because the driving rod 651 connected to the cleaning ring 65 passes through the flushing hole 322, while dredging and cleaning the inside of the flushing hole 322, the gas flowing into the flushing chamber 321 flows downward along the separation chamber 61 through the gap between the flushing hole 322 and the driving rod 651 and contacts the cleaning ring 65, 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 mesh 63 in the contact gap is effectively flushed and cleaned, so as to ensure that the impurities scraped and cleaned by the bristles are taken away by the air flow passing through the gap in time;

[0066] Furthermore, among the gas in contact with the upper surface of the cleaning ring 65, part flows into the hollow part inside the cleaning ring 65 through the replenishing hole 653, and then flows out through the impact holes 654 on the inner wall of the cleaning groove 652, and flushes and cleans from the inside to the outside along the gap between the bristles, so that the bristles are combed by the air flow, and the soot impurities adhered to the bristles fall off and separate, and fall to the bottom collecting chamber 64 along with the gas, thus ensuring the normal operation of the cleaning ring 65.

[0067] Embodiment Six:

[0068] On the basis of the fifth embodiment, the separation cylinder 6 includes a separation part 66 and a flow discharge part 67. The separation part 66 and the flow discharge part 67 are separated from each other, and the limiting ring 671 provided at the top of the flow discharge part 67 is slidably embedded into the limiting chute 661 provided at the bottom of the separation part 66, and the limiting ring 671 is connected to the inner wall of the limiting chute 661 through an elastic member;

[0069] The separation net 63 is made of an elastic material, and the part of the separation net 63 facing the air outlet 331 bulges towards 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 flow discharge part 67.

[0070] Specific working process: On the basis of the specific working process in Embodiment 5, the separation cylinder 6 and the internal collection cavity 64 are divided into two relatively independent parts, namely a separation part 66 and a flow discharge part 67, and the separation part 66 and the flow discharge part 67 are elastically connected; while closing the control valve 333, the gas flows downward intensively and impacts the inner wall of the bottom collection cavity 64, causing the flow discharge part 67 corresponding to the collection cavity 64 to slide downward under force, increasing the distance between it and the upper separation part 66. The annular limiting ring 671 restricts the movement trajectory of the flow discharge part 67 and prevents the internal gas from directly flowing out through the gap between the separation part 66 and the flow discharge part 67; the movement of the flow discharge part 67 causes the separation net 63 and the dust-absorbing material to vibrate, thereby accelerating the falling of the soot and slag impurities adhering to the separation net 63, and the impurities adsorbed by the dust-absorbing material are also evenly mixed with the dust-absorbing material under the vibration action and penetrate into the interior of the dust-absorbing material; and the vibration action causes the dust-absorbing material to maintain a loose state, thus ensuring the gas passing performance of the contact gas;

[0071] Furthermore, because the arc-shaped vibration parts 631 are evenly arranged on the separation net 63, the vertical cross-section of the separation net 63 presents a continuous bending structure. When the gas flowing horizontally impacts the surface of the vibration part 631, the arc-shaped surface causes the gas to flow towards both sides, thereby forming a tangential scouring effect on the surface of the vibration part 631, preventing the eye slag impurities in the gas from accumulating on the surface of the vibration part 631 and ensuring the passing performance of the vibration part 631; and when the cleaning ring 65 moves vertically past the vibration part 631, the extrusion impact of the end of the cleaning ring 65 on the surface of the vibration part 631 causes the elastic separation net 63 to vibrate more intensively, thereby accelerating the shedding of the soot and slag impurities adhering and accumulating on the surface of the separation net 63;

[0072] As the separation part 66 and the flow discharge part 67 separate, both ends of the separation net 63 are respectively pulled, and the bent parts corresponding to the vibration part 631 are straightened, providing a margin for the separation net 63 to be stretched and deformed. And during the process of the separation net 63 being pulled and deformed, the self-vibration of the separation net 63 causes the soot and slag impurities adhering to the surface to accelerate and fall off, and fall to the bottom collection cavity 64 to be recycled and limited, thereby ensuring the passing performance of the separation net 63 and making the recovery of the experimental gas smoother.

[0073] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended 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 test tank (1) is connected to the gas collection tank (3) through a collection tube (13), and the test trigger steel needle (41) of the heating acupuncture mechanism (4) passes through the detection port (14) at the end of the test tank (1) and is slidably connected to the detection port (14) to perform acupuncture detection on the battery pack (5) inside the test tank (1); 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); 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); 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; 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 materials; 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 and passes 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), 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); 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 groove (652); The cleaning ring (65) is hollow inside and communicates with the interior of the separation chamber (61) through a supplementary hole (653) arranged on 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); The separation cylinder (6) comprises a separation portion (66) and a drainage portion (67), wherein 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 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; 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).

Images