CN209894939U - Lithium ion battery or battery pack thermal runaway comprehensive detection system - Google Patents
Lithium ion battery or battery pack thermal runaway comprehensive detection system Download PDFInfo
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- CN209894939U CN209894939U CN201920154864.7U CN201920154864U CN209894939U CN 209894939 U CN209894939 U CN 209894939U CN 201920154864 U CN201920154864 U CN 201920154864U CN 209894939 U CN209894939 U CN 209894939U
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Abstract
The utility model belongs to the technical field of lithium ion battery, especially a lithium ion battery or group battery thermal runaway integrated detection system. The system comprises an explosion-proof laboratory, a simulated battery box, a thermal runaway initiation device, a battery pyrolysis gas acquisition device, an online temperature and pressure measurement and recording system in the battery box and a thermal runaway video recording device for the battery; the thermal runaway initiator is connected with the simulation battery box through the conductive column, the battery pyrolysis gas collecting device is connected with the simulation battery box, and the temperature and pressure online measuring and recording system in the battery box is connected with the simulation battery box. The system can observe and record the parameter change of the runaway effect of the lithium ion battery pack under different environmental atmospheres and different thermal runaway initiation conditions, collect gas products, and explore the influence of a certain battery in the battery pack on other batteries after thermal runaway.
Description
Technical Field
The utility model belongs to the technical field of lithium ion battery, especially a lithium ion battery or group battery thermal runaway integrated detection system.
Background
In recent years, the safety of lithium ion batteries or battery packs has become one of the focuses of wide attention in all social circles due to thermal spontaneous combustion and explosion accidents frequently caused by the lithium ion batteries or battery packs. Under the abuse states of thermal shock, overshoot, overdischarge, short circuit, vibration, extrusion and the like, chemical reactions occur among active substances, electrolyte and other components in the lithium ion battery, a large amount of heat and gas are generated, the temperature of the battery is raised, if the internal heat generation rate is greater than the heat dissipation rate, the reaction temperature in a system can be continuously raised, the chemical reactions are further accelerated, thermal runaway of the battery is triggered, and when the heat and the internal pressure are accumulated to critical limits, the combustion or explosion of the battery can be caused. The technical basis for solving the potential safety hazard is to fully know the out-of-control mechanism of the lithium ion battery and the battery pack.
The existing research mainly adopts an acceleration calorimeter, a C80 micro calorimeter, a cone calorimeter and the like to carry out thermal runaway research on the lithium ion battery. The calorimeter measures the heat of reaction of a sample during thermal decomposition by placing the sample in a calorimetric system for reaction. The C80 micro calorimeter can accurately measure the heat effect of the battery component materials such as electrode materials, electrolyte and the like of the lithium ion battery in the thermal decomposition process, but the test of a single battery cannot be carried out due to low pressure resistance of a sample cell and small loading sample amount. Compared with a C80 micro calorimeter, the acceleration calorimeter has similar functions, the sample amount can be greatly increased, but the research on the thermal runaway propagation rule of the lithium ion battery pack with high explosion risk cannot be carried out. In addition, the acceleration calorimeter and the C80 micro calorimeter mainly measure heat, and the thermal runaway process of the battery cannot be observed in real time. The cone calorimeter is good at simulating the burning behavior of the material in a fire scene, has the functions of flue gas component analysis, heat flux measurement and the like, has larger single test quantity, but cannot perform the lithium ion battery pack thermal runaway spreading rule type test with explosion danger; in addition, when the cone calorimeter is used for testing, a test sample is exposed in the air, a lithium ion battery pack in practical application is positioned in a sealed battery box, and the cone calorimeter can not simulate the thermal runaway process of the lithium ion battery pack in the battery box. The prior art can not carry out more complete test research on the thermal runaway of the lithium ion battery or the battery pack.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem provide a lithium ion battery or group battery thermal runaway integrated detection system.
Realize the utility model discloses the technical solution of purpose does:
a lithium ion battery or battery pack thermal runaway comprehensive detection system comprises an explosion-proof laboratory, a simulated battery box, a thermal runaway initiation device, a battery pyrolysis gas acquisition device, an online temperature and pressure measurement and recording system in the battery box and a battery thermal runaway video recording device;
the thermal runaway initiator is connected with the simulation battery box through the conductive column, the conductive column is sealed with a sealing cover of the simulation battery box through a sealing structure, the battery pyrolysis gas acquisition device is connected with the simulation battery box, the online temperature and pressure measurement and recording system in the battery box is connected with the simulation battery box, and the simulation battery box, the battery pyrolysis gas acquisition device, the measurement part in the online temperature and pressure measurement and recording system in the battery box and the battery thermal runaway video recording device are placed in an explosion-proof test room.
Further, it includes two trapezoidal insulating blocks and two nuts to lead the seal structure that realizes sealing connection between the sealed lid of electrical pillar and simulation battery box, and the cross-section of two trapezoidal insulating blocks is isosceles trapezoid, and two insulating trapezoidal blocks are the adjacent arrangement in the shorter upper base of isosceles trapezoid, and the suit is in the periphery of leading electrical pillar from top to bottom, and the sealed through-hole that covers shape and insulating trapezoidal block assorted that is provided with, and the longer lower base of two trapezoidal insulating blocks isosceles trapezoid passes through the nut fastening, is provided with on leading electrical pillar with nut assorted screw thread.
Furthermore, the simulation battery box is made of materials meeting the requirements of material strength and flammability, and comprises a sample cell and a sealing cover, wherein a rubber gasket is arranged between the sample cell and the sealing cover, and the sample cell and the sealing cover are clamped and sealed by bolt groups uniformly distributed around; one of the side of the sample cell is provided with a round explosion-proof glass window, the sealing cover is also provided with a temperature sensor interface and a plurality of air holes, and the battery or the battery pack is placed in the simulation battery box.
Furthermore, the thermal runaway initiator is an overheating type and comprises a pressure regulator, a conductive column and a heating belt; the heating band parcel is in the periphery of battery or group battery, and the heating band links to each other with the lower extreme that leads electrical pillar, and the upper end that leads electrical pillar links to each other with the regulator, through the rate of heating of regulator adjustment heating band, heats battery or group battery.
Further or, the thermal runaway initiator is overcharged, and comprises a charge-discharge cycle tester and two conductive columns, the charge-discharge cycle tester is connected with a control system of the whole system, the lower ends of the two conductive columns are respectively connected with the positive electrode and the negative electrode of the battery through electric wires, the upper ends of the two conductive columns are connected with a test channel on the charge-discharge cycle tester through a conducting wire, and the battery is overcharged by the charge-discharge cycle tester until thermal runaway occurs in the battery.
Further, the battery pyrolysis gas collecting device comprises a filtering device, a one-way valve, a gas collecting bag, a ball valve II and a vacuum pump;
the battery pyrolysis gas collection device is connected with the gas hole in the sealing cover through a connecting pipeline, the gas hole is connected with one end of a tee joint II through the connecting pipeline, a filtering device and a one-way valve are sequentially arranged between the gas hole and the tee joint II, the other end of the tee joint II is connected with a gas collection bag, and the third end of the tee joint II is connected with a vacuum pump through a ball valve II.
Furthermore, an infrared gas analyzer is adopted to replace a gas collection bag, so that the on-line analysis of the gas is realized.
Further, the on-line temperature and pressure measuring and recording system in the battery box comprises a temperature sensor, a pressure sensor, a ball valve I, an air pump, a collecting card and a control system;
the temperature sensors are connected with temperature sensor interfaces on the sealing covers, the temperature sensors are K-type thermocouples or thermal resistors, one of the two temperature sensors is fixed on the surface close to the battery or the battery pack and used for measuring the temperature of the surface of the battery or the battery pack, and the other temperature sensor is fixed in the area far away from the surface of the battery or the battery pack in the simulated battery box and used for measuring the temperature in the simulated battery box; the temperature sensor is connected with a corresponding acquisition card through a lead, and the acquisition card is connected with the control system;
the air hole in the sealing cover is connected with one end of a tee joint I through a connecting pipeline, the other end of the tee joint I is connected with an air pump through a ball valve I, the third end of the tee joint I is connected with a pressure sensor, the pressure sensor is connected with a corresponding acquisition card through a lead, and the acquisition card is connected with a computer control system.
Furthermore, the battery thermal runaway video recording device comprises a camera or a video detector, an explosion-proof glass observation window for simulating a battery box and an LED lamp, wherein the LED lamp is independently arranged and is powered by a button battery; the system also comprises an exhaust purification device for exhausting residual gas in the explosion-proof test chamber.
A method for detecting thermal runaway of a battery or a battery pack by adopting the system comprises the following steps:
(1) opening an observation window on the simulation battery box, placing the lithium ion battery in the observation window, wrapping the lithium ion battery by using a heating tape, fixing a temperature sensor on the surface of the lithium ion battery, opening an LED lamp in the simulation battery box, closing the observation window, wherein the temperature sensor is a K-type thermocouple, the length of a probe is 30cm, and the diameter of the probe is 1 mm;
(2) when the experimental environmental conditions are oxygen-free: closing the one-way valve, opening the ball valve I, pumping air in the simulated battery box and in each pipeline by using an air pump, and closing the ball valve I to create an anaerobic environment for the experiment;
when the experimental environmental conditions are aerobic: closing the one-way valve and the ball valve;
(3) opening the ball valve II, pumping out air in a pipeline of the battery pyrolysis gas collecting device on the other side of the one-way valve and the air bag by using a vacuum pump, closing the ball valve II, pumping the collecting device into a vacuum state, collecting gas by using pressure difference between the simulated battery box and the gas collecting device, and simultaneously ensuring the purity of the collected gas; opening a temperature detection unit and a pressure detection unit in the control system, and detecting whether the device leaks air or not;
(4) adjusting the heating rate of the heating belt through a pressure regulator, heating the battery, starting a camera to record the experimental process, and simultaneously starting temperature and pressure software in a control system to acquire data;
(5) and after the reaction is finished, opening the one-way valve, and collecting the generated gas into the gas collection bag.
Compared with the prior art, the utility model, it is showing the advantage as follows:
(1) the utility model discloses a thermal runaway causes the device to initiate lithium ion battery or group battery and takes place the thermal runaway, through temperature and pressure on-line measurement in the battery box and record system measurement record thermal runaway in-process battery temperature, the temperature and the pressure of box, collect detection and analysis to the thermal runaway gas result through battery pyrolysis gas collection system or analytical equipment, create simulation battery box internal environment condition through the air pump of connecting line department, can study the influence of oxygen content to lithium ion battery or group battery thermal runaway, to sum up, the system of this application can observe and record different environmental conditions, lithium ion battery group runaway effect parameter variation under the different thermal runaway causes the condition, and to the collection of gas result, can explore the influence etc. to other batteries in the group battery after certain battery takes place the thermal runaway in the group battery;
(2) the utility model discloses a trapezoidal insulating block on the sealed lid has both guaranteed the leakproofness of simulation battery box, has guaranteed the insulation between sealed lid and the conductive column again, and simultaneously, conductive column not only can link to each other with the overcharge device, can link to each other with heating device again for the test system can realize multiple thermal runaway initiation mode;
(3) the utility model discloses a battery thermal runaway video recording device, can be clear shoot record battery box lithium ion battery's thermal runaway whole process, can obtain the battery thermal runaway takes place the accurate time of initial explosion, the battery thermal runaway takes place the duration of explosion and the violent degree of flame;
(4) the utility model discloses a vacuum pump among the gaseous collection system of battery pyrolysis can realize utilizing the pressure differential of simulation battery box and the gaseous collection system of battery pyrolysis to collect battery thermal runaway gas, has guaranteed the gas purity of collecting again simultaneously.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view of the superheat platform configuration of the present application.
Fig. 2 is a schematic structural view of an overcharge platform of the present application.
Fig. 3 is a schematic view of a connection structure of the sealing cap and the conductive pillar according to the present application.
Description of reference numerals:
1-an explosion-proof test room, 2-a simulation battery box, 3-a temperature sensor, 4-a pressure sensor, 5-a ball valve I, 6-an air pump, 7-a filtering device, 8-a one-way valve, 9-a gas collecting bag, 10-a ball valve II, 11-a vacuum pump, 12-a collecting card, 13-a control system, 14-a camera, 15-an exhaust purifying device, 16-a pressure regulator, 17-a heating belt, 18-a charge-discharge circulation tester, 19-a conductive column, 20-a nut, 21-a trapezoidal insulating block and 22-a sealing cover.
Detailed Description
The comprehensive thermal runaway experiment system for the lithium ion battery or the battery pack can be used for the comprehensive experiment of the exploration of the thermal runaway law of the lithium ion battery or the battery pack and the validity verification of the thermal runaway control method of the lithium ion battery or the battery pack. The method can observe and record the parameter change of the runaway effect of the lithium ion battery pack under different environmental atmospheres and different thermal runaway initiation conditions, collect gas products, and explore the influence (namely thermal runaway spread) on other batteries in the battery pack after thermal runaway of a certain battery in the battery pack.
The utility model adopts the technical proposal that: a lithium ion battery or battery pack thermal runaway comprehensive experiment system comprises a simulation battery box 2, a thermal runaway initiating device, a battery pyrolysis gas collecting device, a temperature and pressure online measuring and recording system in the battery box, a battery thermal runaway video recording device and auxiliary devices thereof, an explosion-proof test room 1 and the like.
The thermal runaway initiator is connected with the simulation battery box 2 through a conductive column 19, the battery pyrolysis gas collection or analysis device is connected with the simulation battery box 2 through a connecting pipeline, the on-line temperature and pressure measurement and recording system in the battery box is connected with the simulation battery box 2, and the simulation battery box is placed in the explosion-proof test room 1.
The simulation battery box 2 is made of metal, alloy or nonmetal structural materials, the material strength and the flammability requirement are determined according to specific test targets, the simulation battery box is divided into an upper part and a lower part of a sample cell and a sealing cover, a rubber gasket is arranged between the upper part and the lower part, and the sample cell, the sealing cover and the rubber gasket are clamped, fixed and sealed by bolt groups which are uniformly distributed around the sample cell, the sealing cover and the rubber gasket.
2 lower part sample cell one side of simulation battery box is equipped with circular explosion-proof glass observation window, the observation window comprises structural material board (like corrosion resistant plate), sealed pad (like rubber seal, red copper packing ring etc.) and has high compressive strength glass (like toughened glass, quartz glass etc.), structural material board comprises base and gland, glass is located the two centre, base beading is on simulation battery box, the gland passes through the screw thread and is connected with the base, and press from both sides glass tightly, it can guarantee the leakproofness of observation window department to separate to have sealed pad between glass and the structural material board, simultaneously because adopt threaded connected mode to make the observation window can dismantle between base and the gland, a whole process for placing the battery and observing the record thermal runaway.
The upper sealing cover of the simulated battery box 2 is provided with a temperature sensor interface which is connected with the temperature sensor 3 and used for testing the temperature in the device and the temperature on the surface of the battery in the thermal runaway process.
The upper sealing cover of the simulation battery box 2 is provided with two air holes which are respectively provided with a connecting pipeline. One of them gas pocket passes through connecting tube and links to each other with tee bend I, and I one end of tee bend links to each other with the sensor that is used for testing pressure in the thermal runaway in-process device, and the ball valve I5 of air pump 6 is connected to the other end for pressure and oxygen content in the adjusting device. Another gas pocket passes through the connecting tube battery pyrolysis gas and gathers continuously, and the gas pocket passes through the connecting tube and links to each other with the one end of tee bend II, sets gradually filter equipment 7 and check valve 8 between gas pocket and the tee bend II, and gaseous bag 9 of gathering is connected to the other end of tee bend II, and the third end of tee bend II passes through ball valve II 10 and connects vacuum pump 11. Wherein the filter device 7 is used for filtering solid particles in the flue gas.
The battery pyrolysis gas collecting device comprises a tee joint II, a ball valve II 10 and a vacuum pump 11, wherein one end of the tee joint II is connected with the vacuum pump 11 through the ball valve II 10, and the other end of the tee joint II is connected with a gas collecting bag or a gas collecting bottle.
The gas analysis device can be selected from an infrared gas analyzer or a gas chromatograph.
The upper sealing cover of the simulation battery box 2 is provided with two conductive columns 19 which are connected with a thermal runaway initiator through a conducting wire.
As shown in fig. 3, two trapezoidal insulating blocks 21 are disposed between the conductive column 19 and the sealing cover 22, the conductive column clamps the insulating blocks 21 on the sealing cover through the upper and lower nuts 20, which not only performs a sealing function, but also ensures insulation between the conductive column and the sealing cover, and the trapezoidal insulating blocks 21 are made of a high-temperature-resistant insulating material (such as teflon).
The thermal runaway initiating device comprises a charge-discharge cycle tester 18 and an electric heating device, and can initiate thermal runaway of the battery pack by setting overcharge and overheat conditions.
The electric heating device is a heating belt 17 and a pressure regulator 16.
The temperature and pressure sensors are connected with a control system 13 through an acquisition card 12, and the temperature and pressure in the battery box are monitored in real time in the thermal runaway process.
The battery thermal runaway video recording device is a camera or a video detector, the auxiliary device comprises an explosion-proof transparent window and an LED lamp which simulate the battery box, and the auxiliary device ensures that the video recording device can clearly shoot the thermal runaway process of the lithium ion battery in the battery box.
One side wall of the explosion-proof laboratory is made of explosion-proof glass. The simulation battery box, the battery pyrolysis gas acquisition device, the measurement part in the on-line temperature and pressure measurement and recording system in the battery box and the battery thermal runaway video recording device are placed in an explosion-proof laboratory, and an operator is arranged on the other side of the explosion-proof glass wall to ensure the safety of the operator.
The safety and health protection equipment arranged in the explosion-proof test chamber comprises an automatic fire extinguishing device (containing a fire extinguisher), an explosion-proof chamber exhaust purification device, anti-poison equipment and the like.
Example 1
As shown in fig. 1, the comprehensive thermal runaway experiment system for lithium ion batteries or battery packs in this embodiment includes an explosion-proof laboratory 1, a simulation battery box 2, a voltage regulator 16, a heating belt 17, a temperature sensor 3, a pressure sensor 4, a collection card 12, a control system 13, a camera 14, and an exhaust air purification device 15. The connection pipeline of one side on the sealed lid of simulation battery box 2 is equipped with tee bend I, I one end of tee bend links to each other with pressure sensor 4, one end links to each other with air pump 6, be equipped with ball valve I5 between tee bend and the air pump 6, temperature sensor 3 links to each other with the sealed temperature interface that covers of simulation battery box 2, temperature sensor 3 links to each other with pressure sensor 4 through wire and collection card 12 respectively, collection card 12 links to each other with control system 13, heating tape 17 links to each other with simulation battery box 2 leads electrical pillar lower extreme, regulator 16 links to each other with simulation battery box 2 leads electrical pillar upper end, simulation battery box 2 links to each other with gaseous collection system through the connection pipeline, be equipped with filter equipment 7 and check valve 8 on the connection. One end of a tee joint II in the gas acquisition device is connected with a gas acquisition bag 9, and the other end of the tee joint II is connected with a vacuum pump 11 through a ball valve II 10.
The lithium ion battery pack thermal runaway law experiment steps are as follows: step (1): opening an observation window on the simulation battery box 2, placing the lithium ion battery in the observation window, wrapping the lithium ion battery by using a heating tape 17, fixing the temperature sensor 3 on the surface of the lithium ion battery, opening an LED lamp in the simulation battery box 2, closing the observation window, and paying attention to the fact that the anode and the cathode of the battery can not face the observation window. The temperature sensor is a K-type thermocouple, the length of the probe is 30cm, and the diameter of the probe is 1 mm. The front of the sensor can be bent, and the temperature of the sensor can be measured by clinging to the surface of the battery. Step (2): the experimental environmental conditions are anaerobic: closing the one-way valve 8, opening the ball valve 5, pumping air in the simulated battery box 2 and in each pipeline by using the air pump 6, and closing the ball valve 5 to create an anaerobic environment for the experiment; the experimental conditions were aerobic: closing the one-way valve 8 and the ball valve 5; opening the ball valve 10, pumping out air in a pipeline of the battery pyrolysis gas collecting device on the other side of the one-way valve 8 and the air bag by using a vacuum pump 11, closing the ball valve 10, pumping the collecting device into a vacuum state, collecting gas by using pressure difference between the simulated battery box 2 and the gas collecting device, and simultaneously ensuring the purity of the collected gas; and (4) opening a temperature detection unit and a pressure detection unit in the control system 13 to detect whether the device leaks air. And (4): the heating rate of accessible regulator 16 adjustment heating band 17 heats the battery, opens the appearance 14 record experimentation of making a video recording, opens temperature pressure software in control system 13 simultaneously and carries out data acquisition. And (5): after the reaction is finished, the one-way valve 8 is opened, and the generated gas is collected into the gas collection bag 9. After the experiment, operating personnel can be after 2 temperature of simulation battery box drop to the room temperature, wear gas mask etc. and get into explosion-proof test room 1 operation and open the glass window and the ball valve I5 of simulation battery box 2, pass through purification exhaust apparatus 15 explosion-proof test room 1 with remaining gas in the device.
Example 2
In a further embodiment, the gas collection bag 9 is replaced by an infrared gas analyzer, so that gas products in the thermal runaway process of the lithium ion battery can be analyzed on line, and specific gas product components corresponding to each stage of the thermal runaway can be obtained. The other structure of this embodiment is the same as embodiment 1.
Example 3
In a further embodiment, in order to perform the experiment on the thermal runaway propagation rule of the lithium ion battery pack, the thermal runaway initiating device is replaced by an overcharging device. As shown in fig. 2, the upper end of the conductive column of the simulation battery box 2 is connected to the test channel on the charge-discharge cycle tester 18 through a conductive wire, the lower end of the conductive column of the simulation battery box 2 is connected to the positive electrode and the negative electrode of the battery at a certain position in the battery pack through a conductive wire, the battery is overcharged by the charge-discharge cycle tester 18 until the battery is out of control, and whether the propagation phenomenon of out of control of the battery occurs at other positions in the battery pack is observed. The other structure of this embodiment is the same as embodiment 1.
Claims (9)
1. The lithium ion battery or battery pack thermal runaway comprehensive detection system is characterized by comprising an explosion-proof test room (1), a simulated battery box (2), a thermal runaway initiating device, a battery pyrolysis gas collecting device, an online temperature and pressure measuring and recording system in the battery box and a thermal runaway video recording device of the battery;
the thermal runaway initiator is connected with the simulation battery box (2) through the conductive column (19), the conductive column (19) and a sealing cover of the simulation battery box (2) are sealed through a sealing structure, the battery pyrolysis gas acquisition device is connected with the simulation battery box (2), the online temperature and pressure measurement and recording system in the battery box is connected with the simulation battery box (2), and the simulation battery box (2), the battery pyrolysis gas acquisition device, a measurement part in the online temperature and pressure measurement and recording system in the battery box and the battery thermal runaway video recording device are placed in the explosion-proof test room (1).
2. The system according to claim 1, wherein the sealing structure for sealing connection between the conductive column (19) and the sealing cover of the analog battery box (2) comprises two trapezoid insulating blocks and two nuts, the cross sections of the two trapezoid insulating blocks are isosceles trapezoids, the two trapezoid insulating blocks are arranged adjacently to the shorter upper base of the isosceles trapezoid, the two trapezoid insulating blocks are vertically sleeved on the periphery of the conductive column (19), the sealing cover is provided with through holes matched with the trapezoid insulating blocks in shape, the longer lower bases of the isosceles trapezoids of the two trapezoid insulating blocks are fastened through the nuts, and the conductive column (19) is provided with threads matched with the nuts.
3. The system according to claim 1, characterized in that the simulation battery box (2) is made of a material meeting the requirements of material strength and flammability, the simulation battery box (2) comprises a sample cell and a sealing cover, a rubber gasket is arranged between the sample cell and the sealing cover, and the sample cell and the sealing cover are clamped and sealed by bolt groups uniformly distributed around; one of the sample cells is provided with a round explosion-proof glass window on the side, the sealing cover is also provided with a temperature sensor interface and a plurality of air holes, and the battery or the battery pack is placed in the simulation battery box (2).
4. The system according to claim 3, characterized in that the thermal runaway inducing device is an overheating type comprising a voltage regulator (16), a conductive column (19) and a heating belt (17); heating band (17) parcel is in the periphery of battery or group battery, and heating band (17) link to each other with the lower extreme that leads electrical pillar (19), and the upper end that leads electrical pillar (19) links to each other with the regulator, adjusts the rate of heating band (17) through regulator (16), heats battery or group battery.
5. The system according to claim 3, wherein the thermal runaway initiator is overcharged, and comprises a charge-discharge cycle tester (18) and two conductive columns (19), the charge-discharge cycle tester (18) is connected with the control system (13) of the whole system, the lower ends of the two conductive columns (19) are respectively connected with the positive pole and the negative pole of the battery through electric wires, the upper ends of the two conductive columns (19) are connected with the test channel on the charge-discharge cycle tester (18) through wires, and the battery is overcharged by the charge-discharge cycle tester (18) until the thermal runaway of the battery occurs.
6. The system according to claim 4 or 5, wherein the battery pyrolysis gas collection device comprises a filtering device (7), a one-way valve (8), a gas collection bag (9), a ball valve II (10) and a vacuum pump (11);
the battery pyrolysis gas collecting device is connected with the gas hole in the sealing cover through a connecting pipeline, the gas hole is connected with one end of a tee joint II through the connecting pipeline, a filtering device (7) and a one-way valve (8) are sequentially arranged between the gas hole and the tee joint II, the other end of the tee joint II is connected with a gas collecting bag (9), and the third end of the tee joint II is connected with a vacuum pump (11) through a ball valve II (10).
7. System according to claim 6, characterized in that the on-line analysis of the gas is realized using an infrared gas analyzer instead of a gas collection bag (9).
8. The system according to claim 6, wherein the on-line measuring and recording system for the temperature and the pressure in the battery box comprises a temperature sensor (3), a pressure sensor (4), a ball valve I (5), an air pump (6), a collecting card and a control system (13);
the temperature sensors (3) are connected with temperature sensor interfaces on the sealing covers, the temperature sensors (3) are K-type thermocouples or thermal resistors, one of the two temperature sensors (3) is fixed on the surface close to the battery or the battery pack and used for measuring the temperature of the surface of the battery or the battery pack, and the other temperature sensor is fixed in the area, far away from the surface of the battery or the battery pack, in the simulated battery box (2) and used for measuring the temperature in the simulated battery box (2); the temperature sensor (3) is connected with a corresponding acquisition card through a lead, and the acquisition card is connected with the control system (13);
the air hole in the sealing cover is connected with one end of a tee joint I through a connecting pipeline, the other end of the tee joint I is connected with an air pump (6) through a ball valve I (5), the third end of the tee joint I is connected with a pressure sensor (4), the pressure sensor (4) is connected with a corresponding acquisition card through a wire, and the acquisition card is connected with a computer control system.
9. The system according to claim 8, wherein the battery thermal runaway video recording device comprises a camera or a video detector, an explosion-proof glass observation window simulating a battery box and an LED lamp, wherein the LED lamp is independently arranged and is powered by a button battery; the system also comprises an exhaust purification device (15) for exhausting residual gas in the explosion-proof laboratory (1).
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| CN111289468A (en) * | 2020-03-31 | 2020-06-16 | 浙江大学 | Method and system for analyzing thermal runaway gas production of lithium ion battery containing hydrofluoric acid |
| CN112436201A (en) * | 2020-11-25 | 2021-03-02 | 中国第一汽车股份有限公司 | Device and method for testing thermal runaway gas temperature of battery |
| CN112698210A (en) * | 2020-12-22 | 2021-04-23 | 阳光三星(合肥)储能电源有限公司 | Battery safety testing integrated machine, battery testing system and battery testing method |
| CN113791358A (en) * | 2021-09-15 | 2021-12-14 | 中国民航大学 | Multi-parameter lithium ion battery safety evaluation device and method |
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| CN111289468A (en) * | 2020-03-31 | 2020-06-16 | 浙江大学 | Method and system for analyzing thermal runaway gas production of lithium ion battery containing hydrofluoric acid |
| CN112436201A (en) * | 2020-11-25 | 2021-03-02 | 中国第一汽车股份有限公司 | Device and method for testing thermal runaway gas temperature of battery |
| CN112698210A (en) * | 2020-12-22 | 2021-04-23 | 阳光三星(合肥)储能电源有限公司 | Battery safety testing integrated machine, battery testing system and battery testing method |
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| JP7430840B1 (en) | 2023-08-21 | 2024-02-13 | 株式会社コベルコ科研 | Solid object ejection velocity calculation method and solid object ejection velocity calculation device |
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