CN115754120A - Device and method for verifying effectiveness of fire extinguishing medium for battery module - Google Patents

Abstract

The invention discloses an effectiveness verification device and method for a fire extinguishing medium for a battery module, and relates to the technical field of detection equipment. The method comprises the following steps: the explosion-proof container is used for placing the electric core group for the test; the heating module is used for heating the electric core group for the test; the monitoring module is used for measuring and recording the temperature and the voltage of the electric core group in the test in real time; the fire-fighting unit is used for simulating a fire-fighting system when the electric core group is used and spraying a fire-extinguishing medium to the electric core group; the atmosphere adjusting module is used for adjusting the oxygen content in the anti-explosion container. According to the device and the method for verifying the effectiveness of the fire extinguishing medium for the battery module, disclosed by the invention, a user can be helped to verify the fire extinguishing effectiveness of various fire extinguishing media on the market to the battery module to be used by the user. And then can help the user to select the most suitable fire extinguishing medium that this battery module put out a fire.

Description

Device and method for verifying effectiveness of fire extinguishing medium for battery module

Technical Field

The invention relates to the technical field of detection equipment, in particular to a device and a method for verifying the effectiveness of a fire extinguishing medium for a battery module.

Background

The main stream of fire extinguishing medium used for the battery module in the market is perfluoropropane, heptafluoropropane and molten glue. Perfluoropropane, however, is itself expensive and difficult to store in large quantities to extinguish a fire when necessary. The residual environment exists after the heptafluoropropane is sprayed, the environment is influenced for many years, and personnel can not enter the spraying site within a short time. Meanwhile, the paint is slightly corrosive and has a corrosive effect on surrounding parts. And the gas-melting glue can be attached to the surface of the battery cell and is difficult to clean subsequently after being used.

Therefore, the development of a fire extinguishing medium suitable for the battery module is urgently needed or the fire extinguishing medium is selected from the existing fire extinguishing media. When the battery module is researched and developed or selected, the effectiveness of the fire extinguishing medium on the battery module needs to be verified, and no device or method for verifying the effectiveness of the fire extinguishing medium for the battery module exists in the market at present.

Disclosure of Invention

The invention aims to provide a device and a method for verifying the effectiveness of a fire extinguishing medium for a battery module, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a fire extinguishing medium validity verification device for battery module, it includes: the explosion-proof container is used for placing the electric core group for the test; the heating module is used for heating the electric core group for the test; the monitoring module is used for measuring and recording the temperature and the voltage of the electric core group in the test in real time; the fire-fighting unit is used for simulating a fire-fighting system when the electric core group is used and spraying a fire-fighting medium to the electric core group; the atmosphere adjusting module is used for adjusting the oxygen content in the anti-explosion container.

Preferably in this technical solution, it further includes: and the ignition module is used for igniting the electric core group during the test.

In this aspect, it is preferable that the heating module includes: the heating plate is electrically connected with the power supply, and the ignition module is an igniter.

Preferably in this technical solution, the monitoring module is a multi-channel temperature and voltage monitoring device, the multi-channel temperature and voltage monitoring device includes: the battery temperature monitoring device comprises a plurality of groups of voltage detection probes, a plurality of groups of temperature sensors and a display device, wherein the voltage detection probes are used for monitoring the voltage of a battery cell, the temperature sensors are used for monitoring the temperature of the battery cell, and the display device displays and records the data transmitted by the plurality of groups of voltage detection probes and the plurality of groups of temperature sensors.

In this embodiment, preferably, the atmosphere adjusting module includes: gas tank, gas delivery pipe, solenoid valve and gas detection instrument, gas detection instrument is used for monitoring oxygen content around the electric core group, gas tank is linked together through gas delivery pipe and explosion-proof container, and the solenoid valve setting is on gas delivery pipe.

Based on the verification device, the invention also provides a method for verifying the effectiveness of the fire extinguishing medium for the battery module, which comprises a battery module thermal runaway verification method, wherein the specific verification method comprises the following steps:

s1: at first link together 3 piece at least electric cores that are full of electricity adopt the mode of establishing ties, bind polylith electric core together according to the mode of big face looks laminating in proper order and obtain the electric core group, 3 preceding electric cores in the electric core group are named in proper order: the battery comprises a first battery cell, a second battery cell and a third battery cell, wherein the first large surface of the first battery cell faces outwards, a heating plate is installed on the first large surface of the first battery cell, and a voltage detection probe and a temperature sensor are distributed in the battery cell group;

s2: placing the electric core group and the fire-fighting unit into an explosion-proof container, electrically connecting the heating plate with a power supply, and electrically connecting the display equipment with the voltage detection probe and the temperature sensor respectively;

s3: switching on a heating plate and a power supply, so that the heating plate heats the first electric core, stopping heating until the first electric core is out of control due to heat, spraying a fire extinguishing medium to the electric core group through a fire-fighting unit, stopping the fire-fighting unit until the explosion-proof container is filled with the fire extinguishing medium, and after a test is started and before the explosion-proof container is filled with the fire extinguishing medium, keeping the oxygen content in the explosion-proof container consistent with air through an atmosphere adjusting module;

s4: monitoring data of the voltage detection probe and the temperature sensor within 2 hours from the heating of the heating plate to the stop of the fire-fighting unit are monitored and recorded.

In the preferred technical solution, the method for arranging the voltage detection probes and the temperature sensors in step S1 comprises: when binding the electric core, the three groups of voltage detection probes are respectively connected to the positive pole and the negative pole of the first electric core, the second electric core and the third electric core, and meanwhile, the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the fifth temperature sensor and the sixth temperature sensor are respectively arranged on the first side surface and the second large surface of the first electric core, the first large surface and the second large surface of the second electric core and the first large surface and the second large surface of the third electric core, and the eighth temperature sensor and the ninth temperature sensor are respectively arranged between the positive electrode and the negative electrode of the top surface on the first electric core and on the negative electrode.

In this technical solution, preferably, the thermal runaway determination condition of the first battery cell in step S3 is:

a, generating voltage drop of a first battery cell, wherein the drop value exceeds 25% of the initial voltage;

b, the temperature of any monitoring point reaches the maximum working temperature specified by a manufacturer;

c, the heating rate of any monitoring point is more than or equal to 1 ℃/s and lasts for more than 3 s;

and when a and c occur simultaneously or b and c occur simultaneously, judging that the first battery cell is subjected to thermal runaway.

Preferably, in the technical scheme, the method further comprises a battery module fire-starting verification method, and the specific verification method comprises the following steps:

n1: a fully charged battery cell is named as a fourth battery cell, a heating plate is installed on a first large surface of the fourth battery cell, and then a voltage detection probe and a temperature sensor are distributed on the fourth battery cell;

n2: placing the fourth electric core and the fire-fighting unit into an explosion-proof container, electrically connecting the heating plate with a power supply, and electrically connecting the display equipment with the voltage detection probe and the temperature sensor respectively;

n3: switching on a heating plate and a power supply, so that the heating plate heats a fourth electric core until the fourth electric core is out of thermal control and sprays combustible gas and smoke from a spray valve, igniting the combustible gas and the smoke by using an igniter after the fourth electric core continuously sprays for 5 seconds, spraying a fire extinguishing medium to the fourth electric core through a fire-fighting unit after the explosion-proof container is continuously burnt for 60 seconds, stopping the fire-fighting unit after the explosion-proof container is filled with the fire extinguishing medium, and keeping the oxygen content in the explosion-proof container consistent with the air through an atmosphere adjusting module after a test is started and before the explosion-proof container is filled with the fire extinguishing medium;

n4: monitoring data of the voltage detection probe and the temperature sensor within 2 hours from the heating of the heating plate to the stop of the fire-fighting unit are monitored and recorded.

In the preferred technical solution, the method for arranging the temperature sensors in step N1 comprises: and the first large surface of the fourth battery cell is respectively provided with a first temperature sensor, the second side surface of the fourth battery cell is provided with a seventh temperature sensor, and the top surface of the fourth battery cell, which is positioned between the positive pole and the negative pole, are respectively provided with an eighth temperature sensor and a ninth temperature sensor.

Compared with the prior art, the invention has the beneficial effects that:

through battery module with extinguishing medium validity verification device and method, can help the user to verify the validity of putting out a fire of the battery module that various extinguishing medium on the market will use it. And then can help the user to select the most suitable fire extinguishing medium that this battery module put out a fire. Meanwhile, for a user who develops the fire extinguishing medium of the battery module, the effectiveness of the developed fire extinguishing medium can be verified through the verification device and the verification method. Thereby helping it determine the effectiveness and direction of development of the fire-extinguishing medium.

Drawings

FIG. 1 is a schematic view of the apparatus of the present invention;

fig. 2 is a schematic diagram of a temperature sensor for a thermal runaway test of a battery module according to the present invention;

fig. 3 is a schematic diagram of a temperature sensor for a battery module ignition test according to the present invention;

fig. 4 is an isometric view of a cell in accordance with the present invention;

FIG. 5 is a graph of temperature results of a thermal runaway validation process conducted with perfluorohexanone as the extinguishing medium;

FIG. 6 is a graph of temperature results of a fire verification process using perfluorohexanone as the extinguishing medium;

FIG. 7 is a graph of temperature results for a thermal runaway validation process conducted with water as the extinguishing medium;

FIG. 8 is a graph of temperature results for a method of fire verification using water as the fire extinguishing medium;

FIG. 9 is a graph of temperature results of a thermal runaway validation process conducted with silicone oil as the extinguishing medium;

fig. 10 is a temperature result graph of a fire verification method performed with silicone oil as a fire extinguishing medium.

In the figure: 1. an explosion-proof container; 2. a heating module; 21. heating plates; 3. a monitoring module; 31. a first temperature sensor; 32. a second temperature sensor; 33. a third temperature sensor; 34. a fourth temperature sensor; 35. a fifth temperature sensor; 36. a sixth temperature sensor; 37. a seventh temperature sensor; 38. an eighth temperature sensor; 39. a ninth temperature sensor; 4. a fire-fighting unit; 5. an ignition module; 6. the electric core group; 61. a first cell; 62. a second cell; 63. a third cell; 64. a fourth cell; 611. a first large face; 612. a second major face; 613. a first side surface; 614. a second side surface; 615. a top surface; 616. a bottom surface; 7. and an atmosphere adjusting module.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that in the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Further, it will be appreciated that the dimensions of the various elements shown in the figures are not drawn to scale, for ease of description, e.g., the thickness or width of some layers may be exaggerated relative to other layers.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined or illustrated in one of the figures, it will not need to be further discussed or illustrated in detail in the description of the figures that follows.

Before understanding the present invention, it is clear that in order to make the measurements of the invention accurate and to make the heat transfer between different cells uniform. The cells used in the present invention are shown in fig. 4, which is an isometric view of the cells used in the tests of the present invention. The battery cell is of a cuboid structure, and six planes are arranged outside the battery cell. Two surfaces parallel to the length direction and the width direction are a first large surface 611 and a second large surface 612 respectively; two surfaces parallel to the length direction and the thickness direction thereof are a first side surface 613 and a second side surface 614, respectively; the two surfaces parallel to the width direction and the thickness direction thereof are a top surface 615 and a bottom surface 616, respectively. And the positive and negative poles of the cell are respectively disposed on the top surface 615.

As shown in fig. 1, the present invention provides a technical solution: a fire extinguishing medium validity verification device for a battery module comprises: explosion-proof container 1, heating module 2, monitoring module 3, fire unit 4 and atmosphere adjusting module 7, explosion-proof container 1 is used for placing experimental electric core group 6 or electric core of using, and explosion-proof container 1 main objective prevents when experimental, and electric core group 6 or electric core produce the detonation and injure the people. The explosion-proof container 1 is required to have a certain protection capability. The heating module 2 is used for heating the electric cores in the electric core group 6. In the present invention, the heating module 2 may be various, and may be, for example, electrically heated, microwave heated, or directly heated by a flame spray device. In one particular embodiment of the invention, the heating module 2 comprises: a power supply and a heating plate 21, the heating plate 21 being electrically connected to the power supply. And the heating plate 21 can be closely attached to the first large surface 611 of the cell. The monitoring module 3 is used for measuring and recording the temperature and the voltage of the electric core group 6 in real time during the test. The monitoring module 3 can adopt any device which can be used for monitoring temperature and voltage at the same time on the market. The temperature and the voltage of the electric core group 6 can also be monitored by respectively and independently adopting a voltage monitoring device and a temperature monitoring device. In a specific embodiment of the present invention, the monitoring module 3 is a multi-channel temperature and voltage monitoring device, and the multi-channel temperature and voltage monitoring device includes: multiunit voltage detection probe, multiunit temperature sensor and display device, multiunit voltage detection probe are used for monitoring the voltage of electric core, and multiunit temperature sensor is used for monitoring the temperature of electric core, and the data that multiunit voltage detection probe and multiunit temperature sensor transmitted are shown and take notes to display device. And the fire-fighting unit 4 is used for simulating a fire-fighting system when the electric core group 6 is used and spraying fire-extinguishing medium to the electric core group 6. Therefore, the fire fighting unit 4 is not limited in any way in the present invention, and in the test, it is preferable that the fire fighting system in which the electric core pack 6 is actually used is used as the fire fighting unit 4 of the present invention. For example, the patent numbers are: CN105576305A, with the name: a battery pack safety management system discloses a specific fire fighting device which is used for spraying fire extinguishing medium to a battery pack to extinguish fire. When the battery module needs to be subjected to the effectiveness verification of the fire extinguishing medium, the fire fighting equipment can be selected.

It is clear that the atmosphere regulating module 7 is used to regulate the oxygen content inside the explosion proof container 1. Since the verification device and the verification method are used for verifying the effectiveness of the extinguishing medium. The conventional explosion-proof container 1 is a closed type device in conformity with the actual use environment of the battery. In the closed type device, after the battery is burned or deflagrated, the burned battery is automatically extinguished due to oxygen deficiency in the battery. Therefore, the atmosphere state of the explosion-proof container 1 is adjusted through the atmosphere adjusting module 7, so that the oxygen in the explosion-proof container is consistent with the atmosphere, and the verification accuracy is improved. It is therefore clear that the atmosphere regulating module 7 may be varied. In the present invention, the atmosphere adjusting module 7 includes: the gas detection instrument is used for monitoring the oxygen content around the electric core group 6, the gas tank is communicated with the explosion-proof container 1 through the gas conveying pipe, and the electromagnetic valve is arranged on the gas conveying pipe. In the verification, when the gas detector detects that the oxygen content in the interior of the explosion-proof container 1 is lower than that of air. The electromagnetic valve is automatically opened, and the gas in the gas tank can be conveyed into the explosion-proof container 1 at the moment for adjusting the oxygen content in the explosion-proof container 1. When the oxygen content in the explosion-proof container 1 reaches the air content, the electromagnetic valve is automatically closed. Of course, in other embodiments, in order to stabilize the oxygen content inside the explosion-proof container 1, the oxygen content inside the explosion-proof container 1 can be stabilized in real time by the opening and closing size of the electromagnetic valve. The linkage of the gas detector and the electromagnetic valve is a mature prior art, and therefore, the detailed description is omitted.

It will be appreciated that the gas pressure inside the gas tank needs to be greater than the gas pressure inside the explosion proof container 1 to generate a positive input, since the explosion proof container 1 will generate other combustible gases and fumes when verification is made. In many practices it has been found to be appropriate to control the gas pressure inside the gas tank to 3 atmospheres. Meanwhile, the gas inside the gas tank is mainly a mixed gas of nitrogen and oxygen, wherein the volume ratio of the oxygen to the nitrogen is 23.

Further, the effectiveness of the extinguishing medium is verified for greater clarity. The device also comprises an ignition module 5, wherein the ignition module 5 is used for igniting the electric core group 6 during the test. And further verifies the fire extinguishing effectiveness of the fire extinguishing medium. In the present invention, the ignition module 5 may be any device as long as it can ignite the combustible gas and smoke generated after the thermal runaway of the electric core assembly 6. Specifically, in the present embodiment, the ignition module 5 is an igniter.

Based on the fire extinguishing medium validity verification device for the battery module, the invention provides a method for verifying the validity of the fire extinguishing medium for the battery module. The method comprises a battery module thermal runaway verification method, which comprises the following specific verification method:

s1: at first link together 3 piece at least electric cores that are full of electricity adopt the mode of establishing ties, bind polylith electric core together according to the mode of big face looks laminating in proper order and obtain electric core group 6, 3 preceding electric cores in the electric core group 6 are named in proper order: the battery comprises a first battery cell 61, a second battery cell 62 and a third battery cell 63, wherein a first large surface 611 of the first battery cell 61 faces outwards, a heating plate 21 is installed on the first large surface 611 of the first battery cell 61, and a voltage detection probe and a temperature sensor are distributed in the battery cell group 6;

as shown in fig. 2, in the method, the voltage detection probe and the temperature sensor are arranged by the following steps: when the cells are bound, three groups of voltage detection probes are respectively connected to positive and negative poles of the first cell 61, the second cell 62, and the third cell 63, and meanwhile, the first temperature sensor 31, the second temperature sensor 32, the third temperature sensor 33, the fourth temperature sensor 34, the fifth temperature sensor 35, and the sixth temperature sensor 36 are respectively disposed on the first side 613 and the second large surface 612 of the first cell 61, the first large surface 611 and the second large surface 612 of the second cell 62, and the first large surface 611 and the second large surface 612 of the third cell 63, and the eighth temperature sensor 38 and the ninth temperature sensor 39 are respectively disposed between positive and negative electrodes and on a negative electrode of the top surface 615 of the first cell 61.

S2: put into explosion-proof container 1 with electric core group 6 and fire unit 4 in the middle of to with hot plate 21 and power electric connection, with display device respectively with voltage detection probe and temperature sensor electric connection.

S3: the heating plate 21 and the power supply are connected, so that the heating plate 21 heats the first electric core 61, heating is stopped until the first electric core 61 is out of control due to heat, a fire extinguishing medium is sprayed to the electric core group 6 through the fire-fighting unit 4, the fire-fighting unit 4 is stopped until the explosion-proof container 1 is filled with the fire extinguishing medium, and after a test is started, the oxygen content in the explosion-proof container 1 is kept consistent with the air through the atmosphere adjusting module 7 before the explosion-proof container 1 is filled with the fire extinguishing medium;

wherein: the thermal runaway determination conditions of the first battery cell 61 are:

a, the first battery core 61 generates voltage drop, and the drop value exceeds 25% of the initial voltage;

b, the temperature of any monitoring point reaches the maximum working temperature specified by a manufacturer;

c, the heating rate of any monitoring point is more than or equal to 1 ℃/s and lasts for more than 3 s;

when a and c occur simultaneously or b and c occur simultaneously, it is determined that thermal runaway occurs in the first cell 61.

S4: monitoring data of the voltage detection probe and the temperature sensor from the beginning of heating of the heating plate 21 to 2 hours after the fire unit 4 stops spraying are monitored and recorded.

Meanwhile, for further purposes, the effectiveness of the fire extinguishing medium for extinguishing the fire of the battery module is verified. The method for verifying the effectiveness of the fire extinguishing medium for the battery module further comprises a battery module fire-starting verification method, and the specific verification method comprises the following steps:

n1: a fully charged battery cell is named as a fourth battery cell 64, a heating plate 21 is installed on a first large surface 611 of the fourth battery cell 64, and then a voltage detection probe and a temperature sensor are arranged on the fourth battery cell 64;

as shown in fig. 3, the arrangement method of the temperature sensors is as follows: the first temperature sensor 31 is disposed on the first large surface 611 of the fourth battery cell 64, the seventh temperature sensor 37 is disposed on the second side surface 614 of the fourth battery cell 64, and the eighth temperature sensor 38 and the ninth temperature sensor 39 are disposed on the top surface 615 of the fourth battery cell 64 between the positive and negative poles and on the negative pole, respectively.

N2: put into explosion-proof container 1 with fourth electricity core 64 and fire unit 4 in the middle of to with hot plate 21 and power electric connection, with display device respectively with voltage detection probe and temperature sensor electric connection.

N3: switch-on hot plate 21 and power for hot plate 21 heats fourth electricity core 64, spout combustible gas and smog from the blast valve until fourth electricity core 64 appears thermal runaway, after lasting 5 seconds of eruption, adopt some firearm to ignite combustible gas and smog, and after explosion-proof container 1 is inside to produce the burning and last 60 seconds, spray extinguishing medium to fourth electricity core 64 through fire control unit 4, until after extinguishing medium fills up explosion-proof container 1, stop fire control unit 4, after the experiment begins, before extinguishing medium fills up explosion-proof container 1, keep the oxygen content in explosion-proof container 1 unanimous with the air through atmosphere adjusting module 7.

N4: monitoring data of the voltage detection probe and the temperature sensor from the beginning of heating of the heating plate 21 to 2 hours after the fire unit 4 stops spraying is monitored and recorded.

Specifically, the inventor respectively verifies the fire extinguishing effectiveness of the perfluorohexanone, the water and the silicone oil on the battery module through the fire extinguishing medium effectiveness verification device and the fire extinguishing medium effectiveness verification method for the battery module.

Wherein: in the step S1, the cell group 6 is 9 cells, and the rest steps and parameters are the same as those described above. When recording the test results, the test data of the first temperature sensor 31, the second temperature sensor 32, the third temperature sensor 33, the fourth temperature sensor 34, the fifth temperature sensor 35, the sixth temperature sensor 36, the seventh temperature sensor 37, the eighth temperature sensor 38, and the ninth temperature sensor 39 are named as 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, and 9#, respectively. Specifically, the test results obtained are shown in fig. 5 to 10. FIG. 5 is a graph of temperature results of a thermal runaway validation process conducted with perfluorohexanone as the extinguishing medium; FIG. 6 is a graph of temperature results of a fire verification process using perfluorohexanone as the fire extinguishing medium; FIG. 7 is a graph of temperature results for a thermal runaway validation process conducted with water as the extinguishing medium; FIG. 8 is a graph of temperature results for a method of fire verification using water as the fire extinguishing medium; FIG. 9 is a temperature result graph of a thermal runaway validation process performed with silicone oil as the extinguishing medium; fig. 10 is a temperature result graph of a fire verification method performed with silicone oil as a fire extinguishing medium.

Specifically, in three experimental groups of battery module thermal runaway, spraying respectively and spraying perfluorohexanone, water and silicone oil all did not take place the detonation phenomenon under the condition of battery module thermal runaway. Whole battery module does not all explode in 2 hours of bubble fire extinguishing medium time to except that the first electric core 61 of heating takes place thermal runaway, other electric cores do not have thermal runaway's emergence. When the perfluorohexanone is used for testing, the voltage of the first battery cell 61 returns to zero from 3.33V in 3094-3194 seconds; when the test is carried out by adopting water, the voltage of the first battery cell 61 returns to zero from 3094 seconds to 3199 seconds by 3.33V; when the silicone oil is used for testing, the voltage of the first battery core 61 is reset to zero from 3096 seconds to 3198 seconds from 3.33V. From the results of the thermal runaway test of the battery module shown in fig. 5, 7 and 9, it can be seen that the perfluorohexanone has the most obvious temperature control effect and the fastest temperature drop speed, and can well control the rewarming of the battery core; the effects of water cooling and temperature control are good, the surface temperature of the battery cell can be effectively reduced, but the effect is general; the effect of the silicone oil is the least obvious, the temperature is not reduced within a period of time after the silicone oil is sprayed, the temperature tends to be in an equilibrium state, no temperature reduction performance is realized within a short time, and the effect is the worst. Therefore, in the thermal runaway test of the battery module, the cooling effects of the perfluorohexanone, the water and the silicone oil are gradually reduced.

Specifically, in the three group tests that battery module struck fire, take place thermal runaway and spray perfluor hexanone, water and silicone oil respectively under the condition of burning at the module electricity core and all do not take place the detonation phenomenon. At the in-process of spouting perfluor hexanone, water and silicone oil respectively, the flame that the battery module was lighted up can be put out, and the temperature homoenergetic of battery module can descend, and does not take place compound gentle and the phenomenon of reburning again, explains that electric core takes place the burning, uses perfluor hexanone, water or silicone oil to spray the homoenergetic that can control stretching of intensity of a fire. However, as seen from the results of the battery module ignition tests in fig. 6, 8 and 10, the battery module is cooled at the highest speed and has the most obvious cooling effect by adopting the perfluorohexanone as the fire extinguishing medium; water is used as a fire extinguishing medium, and the temperature reduction effect of the battery module is general; and adopt silicon oil as fire extinguishing medium, battery module's cooling effect is most obvious, and the temperature has the rising trend after pouring into silicon oil into, and the temperature descends slowly moreover, and silicon oil can not be very fast reduction battery module surface temperature. Therefore, in the battery module ignition test, the using effects of the perfluorohexanone, the water and the silicone oil are gradually reduced.

In summary, the verification apparatus and the verification method can be used to comprehensively consider. Screening out the fire extinguishing medium that is fit for battery module needs to be used under various different application scenes. The device and the method can also be used for evaluating the effect of the fire extinguishing medium for the battery module during research and development.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The utility model provides a battery is fire extinguishing medium validity verification device for module which characterized in that includes:

the explosion-proof container (1), the said explosion-proof container (1) is used for placing the electric core group (6) used for experiment;

the heating module (2) is used for heating the electric core group (6) for the test;

the monitoring module (3) is used for measuring and recording the temperature and the voltage of the electric core group (6) in the test in real time;

the fire-fighting unit (4) is used for simulating a fire-fighting system when the electric core group (6) is used, and spraying a fire-extinguishing medium to the electric core group (6);

the atmosphere adjusting module (7) is used for adjusting the oxygen content in the anti-explosion container (1).

2. The validity verification device of fire extinguishing medium for battery module according to claim 1, further comprising: the ignition module (5) is used for igniting the electric core group (6) in the test.

3. The fire extinguishing medium validity verification device for battery modules according to claim 2, characterized in that the heating module (2) comprises: power and hot plate (21), hot plate (21) and power electric connection, ignition module (5) are some firearm.

4. The fire extinguishing medium validity verification device for the battery module according to claim 1, wherein the monitoring module (3) is a multi-channel temperature and voltage monitoring device, and the multi-channel temperature and voltage monitoring device comprises: the battery pack comprises a plurality of groups of voltage detection probes, a plurality of groups of temperature sensors and display equipment, wherein the voltage detection probes are used for monitoring the voltage of the battery cell, the temperature sensors are used for monitoring the temperature of the battery cell, and the display equipment displays and records data transmitted by the plurality of groups of voltage detection probes and the plurality of groups of temperature sensors.

5. The device for verifying the effectiveness of fire extinguishing medium for battery modules according to any one of claims 1 to 4, characterized in that the atmosphere regulating module (7) comprises: the gas detection instrument is used for monitoring the oxygen content around the electric core group (6), the gas tank is communicated with the explosion-proof container (1) through the gas conveying pipe, and the electromagnetic valve is arranged on the gas conveying pipe.

6. The method for verifying the effectiveness of the fire extinguishing medium for the battery module is characterized by comprising a battery module thermal runaway verification method, wherein the specific verification method comprises the following steps:

s1: at least 3 electric cores that are full of electricity adopt the mode of establishing ties to link together at first, bind polylith electric core together according to the mode of large face looks laminating in proper order and obtain electric core group (6), 3 preceding electric cores are denominated in proper order in electric core group (6): the battery comprises a first battery cell (61), a second battery cell (62) and a third battery cell (63), wherein a first large surface (611) of the first battery cell (61) faces outwards, a heating plate (21) is installed on the first large surface (611) of the first battery cell (61), and a voltage detection probe and a temperature sensor are arranged in a battery core group (6);

s2: placing the electric core group (6) and the fire-fighting unit (4) into the explosion-proof container (1), electrically connecting the heating plate (21) with a power supply, and electrically connecting the display equipment with the voltage detection probe and the temperature sensor respectively;

s3: switching on a heating plate (21) and a power supply to enable the heating plate (21) to heat a first battery core (61), stopping heating until the first battery core (61) is out of control due to heat, spraying a fire extinguishing medium to a battery core group (6) through a fire-fighting unit (4), stopping the fire-fighting unit (4) until the explosion-proof container (1) is filled with the fire extinguishing medium, and after a test is started and before the explosion-proof container (1) is filled with the fire extinguishing medium, keeping the oxygen content in the explosion-proof container (1) consistent with the air through an atmosphere adjusting module (7);

s4: monitoring data of the voltage detection probe and the temperature sensor within 2 hours from the heating of the heating plate (21) to the stop of the fire-fighting unit (4) is monitored and recorded.

7. The method for verifying the effectiveness of the fire extinguishing medium for the battery module as recited in claim 6, wherein the voltage detection probes and the temperature sensors are arranged in the step S1 by the following steps: when the cells are bound, three groups of voltage detection probes are respectively connected to positive and negative poles of a first cell (61), a second cell (62) and a third cell (63), a first temperature sensor (31), a second temperature sensor (32), a third temperature sensor (33), a fourth temperature sensor (34), a fifth temperature sensor (35) and a sixth temperature sensor (36) are respectively arranged on a first side surface (613) and a second large surface (612) of the first cell (61), a first large surface (611) and a second large surface (612) of the second cell (62) and a first large surface (611) and a second large surface (612) of the third cell (63), and an eighth temperature sensor (38) and a ninth temperature sensor (39) are respectively arranged between positive and negative poles of a top surface (615) of the first cell (61) and on negative poles.

8. The method for verifying the validity of the fire extinguishing medium for the battery module as recited in claim 6 or 7, wherein the thermal runaway determination condition of the first battery cell (61) in step S3 is as follows:

a) The first battery cell (61) generates voltage drop, and the drop value exceeds 25% of the initial voltage;

b) The temperature of any monitoring point reaches the maximum working temperature specified by the manufacturer;

c) The heating rate of any monitoring point is more than or equal to 1 ℃/s and lasts for more than 3 s;

and when a) and c) occur simultaneously or b) and c) occur simultaneously, judging that the first battery cell (61) has thermal runaway.

9. The method for verifying the effectiveness of the fire extinguishing medium for the battery module according to claim 6 or 7, further comprising a battery module fire verification method, wherein the specific verification method comprises the following steps:

n1: a fully charged battery cell is named as a fourth battery cell (64), a heating plate (21) is arranged on a first large surface (611) of the fourth battery cell (64), and then a voltage detection probe and a temperature sensor are arranged on the fourth battery cell (64);

n2: placing a fourth battery cell (64) and the fire-fighting unit (4) into the explosion-proof container (1), electrically connecting the heating plate (21) with a power supply, and electrically connecting the display equipment with the voltage detection probe and the temperature sensor respectively;

n3: connecting a heating plate (21) and a power supply, enabling the heating plate (21) to heat a fourth electric core (64) until the fourth electric core (64) is out of thermal control and sprays combustible gas and smoke from a spray valve, igniting the combustible gas and the smoke by using an igniter after continuously spraying for 5 seconds, spraying a fire extinguishing medium to the fourth electric core (64) through a fire engine unit (4) after the explosion-proof container (1) is burnt and continuously spraying for 60 seconds until the explosion-proof container (1) is filled with the fire extinguishing medium, stopping the fire engine unit (4), and keeping the oxygen content in the explosion-proof container (1) consistent with the air through an atmosphere adjusting module (7) before the explosion-proof container (1) is filled with the fire extinguishing medium after a test is started;

n4: monitoring data of the voltage detection probe and the temperature sensor within 2 hours from the heating of the heating plate (21) to the stop of the fire-fighting unit (4) is monitored and recorded.

10. The method for verifying the effectiveness of the fire extinguishing medium for the battery module according to claim 9, wherein the arrangement method of the temperature sensors in the step N1 comprises the following steps: a first temperature sensor (31) is arranged on a first large surface (611) of the fourth battery cell (64), a seventh temperature sensor (37) is arranged on a second side surface (614) of the fourth battery cell (64), and an eighth temperature sensor (38) and a ninth temperature sensor (39) are arranged on the top surface (615) of the fourth battery cell (64) between the positive pole and the negative pole and on the negative pole respectively.

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