Testing method for inhibiting combustion of lithium ion battery by fire extinguishing particles for packaging box

Abstract

The invention relates to a test method for inhibiting combustion of a lithium ion battery by fire-extinguishing particles for a packaging box. The test method comprises the following steps: filling flame-retardant particles into a melt-blown cloth packaging bag and packaging; the lithium ion battery is fully charged, and then the fully charged lithium ion battery is placed at the bottom in the packaging box; the first thermocouple monitors the temperature of the lower surface of the heating plate, the second thermocouple monitors the temperature of the upper surface of the lithium ion battery, the third thermocouple monitors the temperature of the position 5 cm above the lithium ion battery, and the camera monitors and records the whole test process; a fire extinguishing agent is arranged, specifically, a melt-blown cloth packaging bag filled with flame-retardant particles is placed on the top of a packaging box; starting a heating plate: starting the heating plate to heat the lithium ion battery placed on the heating plate; if the lithium ion battery is on fire due to thermal runaway, stopping heating the heating plate, and recording the whole test process; and data processing and data analysis. The testing method has the advantages of simplicity and convenience in operation, low cost and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of battery thermal runaway, and specifically to a test method for suppressing the combustion of lithium-ion batteries by fire extinguishing particles for a packaging box. Background Art

[0002] If lithium-ion batteries encounter working conditions such as long-term vibration, impact, high temperature, and low air pressure during transportation, they are prone to triggering thermal runaway and catching fire. Therefore, packaging boxes with automatic fire extinguishing functions are the trend for lithium battery transportation safety. Currently, the common method for verifying the fire extinguishing performance of lithium-ion battery fire extinguishing agents is to release the fire extinguishing agent through a high-pressure water pump or high-pressure gas, which is not applicable to the scenario of lithium battery transportation packaging and lacks the performance test of fire extinguishing agents for lithium battery transportation packaging. The present invention has developed a method for releasing the fire extinguishing agent by gravity to verify the fire extinguishing performance of the fire extinguishing agent, and relates to a test method for suppressing the thermal runaway combustion of lithium-ion batteries with fire extinguishing particles. Summary of the Invention

[0003] In view of the above problems existing in the prior art, the main purpose of the present invention is to provide a test method for suppressing the combustion of lithium-ion batteries by fire extinguishing particles for a packaging box.

[0004] The technical solution of the present invention is as follows:

[0005] A test method for suppressing the combustion of lithium-ion batteries by fire extinguishing particles for a packaging box, the test method comprising the following steps:

[0006] S1: Prepare the fire extinguishing agent, load 200 g of flame retardant particles into a meltblown fabric packaging bag and seal it well;

[0007] S2: Prepare the lithium-ion battery: fully charge the lithium-ion battery, and then place the fully charged lithium-ion battery at the bottom inside the packaging box;

[0008] S3: Arrange temperature sensors: fixedly install a heating plate at the bottom inside the packaging box, place the fully charged lithium-ion battery on the heating plate, set a first thermocouple on the upper surface of the heating plate, and set a second thermocouple on the upper surface of the lithium-ion battery; set a third thermocouple at a position 5 cm away from the upper surface of the lithium-ion battery on the inner side wall of the packaging box; set a camera on the top side wall inside the packaging box;

[0009] S4: Arrange the fire extinguishing agent: place the meltblown fabric packaging bag filled with flame retardant particles on the top of the packaging box, and at the same time set a first opening on the top of the packaging box, place the meltblown fabric packaging bag on the first opening, and the meltblown fabric packaging bag is located directly above the lithium-ion battery;

[0010] S5: Turn on the heating plate: start the heating plate to heat the lithium-ion battery placed on it;

[0011] S6: When the lithium-ion battery undergoes thermal runaway and catches fire, stop heating the heating plate. The first thermocouple monitors the temperature of the lower surface of the heating plate, the second thermocouple monitors the temperature of the upper surface of the lithium-ion battery, the third thermocouple monitors the temperature at a position 5 cm above the lithium-ion battery, and the camera monitors and records the entire test process;

[0012] S7: Data processing and data analysis.

[0013] An electric heating device is provided outside the packaging box, and the electric heating device is electrically connected to the heating plate. The heating plate is heated through the electric heating device.

[0014] A temperature recorder is also provided outside the packaging box, and the temperature recorder is electrically connected to the first thermocouple, the second thermocouple, and the third thermocouple respectively.

[0015] The shape of the spray-melted cloth packaging bag is rectangular, and a second opening is provided at one end of the spray-melted cloth packaging bag. The flame-retardant particles are filled into the spray-melted cloth packaging bag through the second opening.

[0016] The flame-retardant particles are fire-extinguishing particles or dry water fire extinguishing agent, and the fire-extinguishing particles are glass microspheres.

[0017] The spray-melted cloth packaging bag is placed along the length direction on the top of the packaging box.

[0018] The length of the spray-melted cloth packaging bag is less than the length of the packaging box, and the width of the spray-melted cloth packaging bag is less than the width of the packaging box.

[0019] The shape of the first opening is rectangular, the length of the first opening is less than the length of the spray-melted cloth packaging bag, and the width of the first opening is not greater than the width of the spray-melted cloth packaging bag.

[0020] The present invention has the following advantages and beneficial effects: The present invention relates to a test method for suppressing the combustion of lithium-ion batteries with fire extinguishing particles for a packing box, comprising the following steps: preparing a fire extinguishing agent, and loading the flame retardant particles into a meltblown fabric packaging bag; preparing a lithium-ion battery: fully charging the lithium-ion battery, and then placing the fully charged lithium-ion battery at the bottom inside the packing box; arranging temperature sensors: the first thermocouple monitors the temperature of the lower surface of the heating plate, the second thermocouple monitors the temperature of the upper surface of the lithium-ion battery, the third thermocouple monitors the temperature at a position 5 cm above the lithium-ion battery, and a camera monitors and records the entire test process; arranging the fire extinguishing agent: placing the meltblown fabric packaging bag filled with the flame retardant particles on the top of the packing box; turning on the heating plate: starting the heating plate to heat the lithium-ion battery placed thereon; when the lithium-ion battery undergoes thermal runaway and catches fire, stop heating the heating plate and record the entire test process; data processing and data analysis; The test method of the present invention has the advantages of simple operation and low cost. Description of the Drawings

[0021] Figure 1 FIG. is a schematic perspective view of the cooperation between the packing box and the meltblown fabric packaging bag provided by an embodiment of the present invention.

[0022] Figure 2 FIG. is an enlarged schematic perspective view of the meltblown fabric packaging bag provided by an embodiment of the present invention.

[0023] Figure 3 FIG. is a schematic diagram of the temperature change during the test of the thermal runaway of the combustion of the lithium-ion battery provided by an embodiment of the present invention.

[0024] Figure 4 FIG. is a schematic diagram of the temperature change of the fire extinguishing particles filled in the meltblown fabric packaging bag as a fire extinguishing agent during the test of the thermal runaway of the combustion of the lithium-ion battery provided by an embodiment of the present invention.

[0025] Figure 5 FIG. is a schematic flow chart of the test method for suppressing the combustion of lithium-ion batteries with fire extinguishing particles for a packing box provided by an embodiment of the present invention. Detailed Embodiments

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] As Figures 1 to 5 shown: A test method for suppressing the combustion of lithium-ion batteries by fire extinguishing particles for a packing box provided by an embodiment of the present invention, the test method includes the following steps:

[0031] S1: Prepare a fire extinguishing agent, put 200 g of flame retardant particles into the meltblown cloth packaging bag 100 and seal it well;

[0032] S2: Prepare a lithium-ion battery: fully charge the lithium-ion battery, and then place the fully charged lithium-ion battery 202 at the bottom inside the packing box 200;

[0033] S3: Arranging temperature sensors: Fix a heating plate 201 at the bottom inside the packing box 200, place the fully charged lithium-ion battery 202 on the heating plate 201, set a first thermocouple 203 on the upper surface of the heating plate 201, and set a second thermocouple 204 on the upper surface of the lithium-ion battery 202; Set a third thermocouple 205 at a position 5 cm away from the upper surface of the lithium-ion battery 202 on the inner side wall of the packing box 200; Set a camera 206 on the top side wall inside the packing box 200;

[0034] S4: Arranging fire extinguishing agent: Place the meltblown cloth packaging bag 100 filled with flame retardant particles on the top of the packing box 200. At the same time, set a first opening on the top of the packing box 200. The meltblown cloth packaging bag 100 is placed on the first opening, and the meltblown cloth packaging bag 100 is located directly above the lithium-ion battery 202;

[0035] S5: Turning on the heating plate: Start the heating plate 201 to heat the lithium-ion battery 202 placed on it;

[0036] S6: When the lithium-ion battery 202 has a thermal runaway and catches fire, stop heating the heating plate 201. The first thermocouple 203 monitors the temperature of the lower surface of the heating plate 201, the second thermocouple 204 monitors the temperature of the upper surface of the lithium-ion battery 202, the third thermocouple 205 monitors the temperature at a position 5 cm above the lithium-ion battery 202, and the camera 206 monitors and records the entire test process;

[0037] S7: Data processing and data analysis.

[0038] An electric heating device is provided outside the packing box 200. The electric heating device is electrically connected to the heating plate 201, and the heating plate 201 is heated through the electric heating device.

[0039] A temperature recorder is also provided outside the packing box 200. The temperature recorder is electrically connected to the first thermocouple 203, the second thermocouple 204, and the third thermocouple 205 respectively.

[0040] The meltblown cloth packaging bag 100 is rectangular in shape. One end of the meltblown cloth packaging bag 100 is provided with a second opening, and the flame retardant particles are filled into the meltblown cloth packaging bag 100 through the second opening.

[0041] The flame retardant particles are fire extinguishing particles or dry water fire extinguishing agent, and the fire extinguishing particles are glass microspheres.

[0042] The meltblown cloth packaging bag 100 is placed on the top of the packing box 200 along the length direction.

[0043] The length of the thermal spraying non-woven fabric packaging bag 100 is less than that of the packaging box 200, and the width of the thermal spraying non-woven fabric packaging bag 100 is less than that of the packaging box 200.

[0044] The shape of the first opening is rectangular. The length of the first opening is less than that of the thermal spraying non-woven fabric packaging bag 100, and the width of the first opening is not greater than that of the thermal spraying non-woven fabric packaging bag 100.

[0045] A test method for suppressing the combustion of lithium-ion batteries with fire extinguishing particles for a packaging box provided by an embodiment of the present invention. The specific relevant experimental parameters are as follows: The size of the heating plate is 50mm * 80mm * 25mm, its heating power is 500W. The lithium-ion battery selected is an 8AH ternary soft-pack lithium battery with a voltage of 4.2V. When the lithium-ion battery undergoes thermal runaway combustion, the electric heating device is turned off to stop heating the heating plate 201. The measurement ranges of the first thermocouple 203, the second thermocouple 204, and the third thermocouple 205 are from room temperature to 1000 °C, and the accuracy is 0.1 °C.

[0046] The 8Ah ternary soft-pack lithium battery can sustain combustion for 38 seconds during thermal runaway, and the highest temperature reaches 687.8 degrees Celsius. 200g of flame retardant particles can extinguish the 8Ah ternary soft-pack lithium battery within 1 second, and the highest temperature is significantly reduced to 471.9 °C.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A test method for inhibiting the combustion of lithium-ion batteries using fire-extinguishing particles in packaging boxes, characterized in that: The test method comprises the following steps: S1: Prepare the fire extinguishing agent, put 200g of flame retardant particles into the meltblown fabric packaging bag and seal it; S2: Prepare the lithium-ion battery: fully charge the lithium-ion battery, and then place the fully charged lithium-ion battery at the bottom of the packaging box; S3: Arrange temperature sensors: a heating plate is fixedly arranged at the bottom of the packaging box, a fully charged lithium-ion battery is placed on the heating plate, a first thermocouple is arranged on the upper surface of the heating plate, and a second thermocouple is arranged on the upper surface of the lithium-ion battery; a third thermocouple is arranged on the inner side wall of the packaging box at a position 5 cm away from the upper surface of the lithium-ion battery; a camera is arranged on the top side wall of the packaging box; S4: Arrange the fire extinguishing agent: place the meltblown fabric packaging bag filled with flame retardant particles on the top of the packaging box, and at the same time set a first opening on the top of the packaging box, the meltblown fabric packaging bag is placed on the first opening, and the meltblown fabric packaging bag is located directly above the lithium-ion battery; S5: Turn on the heating plate: Turn on the heating plate to heat the lithium-ion battery placed thereon; S6: The lithium-ion battery thermally runs away and catches fire, the heating of the heating plate is stopped, the first thermocouple monitors the temperature of the lower surface of the heating plate, the second thermocouple monitors the temperature of the upper surface of the lithium-ion battery, the third thermocouple monitors the temperature 5 cm above the lithium-ion battery, and the camera monitors and records the entire test process; S7: Data processing and data analysis.

2. The test method for suppressing the combustion of lithium-ion batteries by fire-extinguishing particles for packaging boxes according to claim 1, characterized in that: An electric heating device is arranged outside the packaging box, and the electric heating device is electrically connected to the heating plate, so that the heating plate is heated by the electric heating device.

3. The testing method for suppressing the combustion of lithium-ion batteries by fire-extinguishing particles for packaging boxes according to claim 1, characterized in that: A temperature recorder is also arranged outside the packaging box, and the temperature recorder is electrically connected to the first thermocouple, the second thermocouple and the third thermocouple respectively.

4. The test method for inhibiting the combustion of lithium-ion batteries using fire-extinguishing particles for packaging boxes according to any one of claims 1 to 3, characterized in that: The melt-spraying cloth packaging bag is in a rectangular shape, and a second opening is provided at one end of the melt-spraying cloth packaging bag, and the flame-retardant particles are filled into the melt-spraying cloth packaging bag through the second opening.

5. The testing method for suppressing the combustion of lithium-ion batteries by fire-extinguishing particles for packaging boxes according to claim 4, characterized in that: The flame retardant particles are fire extinguishing particles or dry water fire extinguishing agents, and the fire extinguishing particles are glass microspheres.

6. The method for testing fire extinguishing particles for packaging boxes to inhibit combustion of lithium-ion batteries according to claim 4, characterized in that: The meltblown fabric packaging bag is placed on the top of the packaging box along the length direction.

7. The method for testing fire extinguishing particles for packaging boxes to inhibit combustion of lithium-ion batteries according to claim 6, characterized in that: The length of the meltblown fabric packaging bag is smaller than the length of the packaging box, and the width of the meltblown fabric packaging bag is smaller than the width of the packaging box.

8. The method for testing fire extinguishing particles for packaging boxes to inhibit combustion of lithium-ion batteries according to claim 4, characterized in that: The first opening is in a rectangular shape, the length of the first opening is smaller than the length of the meltblown fabric packaging bag, and the width of the first opening is not greater than the width of the meltblown fabric packaging bag.

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