Lithium battery thermal failure detection device

Abstract

The utility model provides a lithium battery thermal failure detection device which comprises an explosion-proof box body and an explosion-proof box door, and a temperature sensor, a gas sensor, a smoke sensor, a flame sensor and a fire extinguishing mechanism are installed in the explosion-proof box body. The fire extinguishing mechanism comprises a mixing section, a buffering section and a spraying section which are communicated in sequence, dry powder located in the mixing section, a compressed gas conveying pipe with one end extending into the mixing section, and an isolating element for isolating the mixing section and the buffering section; the mixing section is connected to the inner top wall of the anti-explosion box body, and the other end of the compressed gas conveying pipe extends out of the anti-explosion box body. The lithium battery thermal failure detection device provided by the utility model can detect various parameters such as temperature, gas concentration, smoke particles and flame in the lithium battery thermal failure process, in addition, the lithium battery thermal failure detection device is also provided with the fire extinguishing mechanism, so that the burning lithium battery can be extinguished in time, more serious consequences are prevented from being caused, and the detection process is safer and more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a lithium battery thermal failure detection device. Background Art

[0002] During the charging and discharging processes of lithium batteries, chemical reactions occur and heat is generated, causing the battery temperature to rise. When the rate of heat generation is greater than the heat dissipation rate, the temperature will continue to rise. If the temperature rises to the ignition point of the reactants, combustion will occur, further increasing the temperature and accelerating the reaction of the active substances in the lithium battery. Then a large amount of gas is generated, and the lithium battery explodes due to a sharp increase in internal pressure. It can be seen that the thermal failure of lithium-ion batteries occurs gradually during the charging and discharging processes. Detecting various parameters during the thermal failure process of lithium batteries is of great significance for the further research of lithium batteries. Therefore, there is an urgent need to design a reliable lithium battery failure detection device to study the thermal failure process of lithium batteries. Summary of the Utility Model

[0003] The purpose of the utility model is to disclose a lithium battery thermal failure detection device, which can detect various parameters during the thermal failure process of lithium batteries, such as temperature, gas concentration, smoke particles, and flame. In addition, a fire extinguishing mechanism is provided, which can extinguish the burning lithium battery in time to prevent more serious consequences and make the detection process safer and more reliable.

[0004] To achieve the above purpose, the utility model provides a lithium battery thermal failure detection device, including an explosion-proof box body and an explosion-proof box door. A temperature sensor, a gas sensor, a smoke sensor, a flame sensor, and a fire extinguishing mechanism are installed in the explosion-proof box body; the fire extinguishing mechanism includes a mixing section, a buffer section, and a spraying section that are connected in sequence. Dry powder is located in the mixing section, a compressed gas delivery pipe with one end extending into the mixing section, and an isolation element that separates the mixing section and the buffer section; the mixing section is connected to the top wall inside the explosion-proof box body, and the other end of the compressed gas delivery pipe extends outside the explosion-proof box body.

[0005] In some embodiments, the isolation element includes a gasket and a piece of paper that are fitted together, and several bolts. Through holes for the bolts to pass through are provided on the gasket and the piece of paper, and several threaded holes are provided on the inner wall of the mixing section. The bolts pass through the through holes and are screwed into the threaded holes, so that the gasket presses the piece of paper at the connection between the mixing section and the buffer section.

[0006] In some embodiments, the spraying section is in the shape of a hollow disc, and several spraying holes are provided at the bottom of the spraying section.

[0007] In some embodiments, a sliding base is further provided inside the explosion-proof box body. A lithium battery limiting groove is provided on the sliding base, and the fire extinguishing mechanism is located directly above the lithium battery limiting groove.

[0008] In some embodiments, a plurality of pulleys are installed on the sliding base, and a sliding groove for the pulleys to slide is provided on the inner bottom wall of the explosion-proof box body.

[0009] In some embodiments, a handle is installed on the sliding base.

[0010] In some embodiments, an explosion-proof window is installed on the explosion-proof box door.

[0011] In some embodiments, a pressure sensor and a pressure relief valve are also installed on the explosion-proof box body.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: The lithium battery thermal failure detection device provided by the present utility model can detect various parameters during the thermal failure process of lithium batteries, such as temperature, gas concentration, smoke particles, and flame. In addition, a fire extinguishing mechanism is provided to extinguish the burning lithium battery in a timely manner, preventing more serious consequences and making the detection process safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the lithium battery thermal failure detection device shown in the present utility model;

[0014] Figure 2 is a schematic internal structure diagram of the lithium battery thermal failure detection device shown in the present utility model;

[0015] Figure 3 is Figure 2 a schematic structural diagram of the sliding base shown in

[0016] Figure 4 is Figure 2 a schematic structural diagram of the isolation element shown in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present utility model will be described in detail below with reference to the embodiments shown in the drawings. However, it should be noted that these embodiments do not limit the present utility model, and any equivalent transformation or substitution in terms of function, method, or structure made by those of ordinary skill in the art based on these embodiments shall fall within the protection scope of the present utility model.

[0018] As Figures 1-4 shown, the lithium battery thermal failure detection device includes an explosion-proof box body 1 and an explosion-proof box door 2. An explosion-proof window 20 and a handle 21 are installed on the explosion-proof box door 2, and the explosion-proof window 20 facilitates observing the state of the lithium battery inside the explosion-proof box body 1.

[0019] A temperature sensor 61, a gas sensor 62, a smoke sensor 63, and a flame sensor 64 are installed inside the explosion-proof box body 1. The temperature sensor 61 is used to monitor the internal temperature of the explosion-proof box body 1 in real time, so as to make a pre-warning judgment on the thermal failure of the lithium battery 4; the gas sensor 62 and the smoke sensor 63 can judge the gas and smoke leaked from the lithium battery 4, and can quickly detect the size of the gas concentration and the size of the smoke particles, so that an effective pre-warning judgment can be made before the lithium battery 4 catches fire; the flame sensor 64 is used to judge the moment when the flame just appears; in this way, pre-warnings can be carried out without omission from the initial moment of failure to the process of generating a flame.

[0020] The temperature sensor 61, the gas sensor 62, the smoke sensor 63, and the flame sensor 64 are all externally connected to a display through lines. Through the temperature sensor 61, the gas sensor 62, the smoke sensor 63, and the flame sensor 64, various parameters such as temperature, gas concentration, smoke particles, and flame during the thermal failure process of the lithium battery 4 can be monitored, which is of great significance for the further research of the lithium battery 4.

[0021] The lithium battery 4 is connected to a charge and discharge wire 41, and the charge and discharge wire 41 is externally connected to a lithium battery 4 charge and discharge controller to charge and discharge the lithium battery 4. A pressure sensor 65 is also installed on the explosion-proof box body 1 to monitor the air pressure inside the explosion-proof box body 1 in real time, and the pressure relief valve 11 is opened when necessary to ensure safety.

[0022] A fire extinguishing mechanism 5 is installed inside the explosion-proof box body 1. The fire extinguishing mechanism 5 includes a mixing section 51, a buffer section 52, and a spraying section 53 that are connected in sequence, dry powder 54 located in the mixing section 51, a compressed gas delivery pipe 56 with one end extending into the mixing section 51, and an isolation element 55 that isolates the mixing section 51 and the buffer section 52. The dry powder 54 is fire extinguishing dry powder.

[0023] Both the mixing section 51 and the buffer section 52 are cylindrical, and the diameter of the buffer section 52 is smaller than that of the mixing section 51. The spraying section 53 is in the shape of a hollow disc, and a plurality of spraying holes 530 are provided at the bottom of the spraying section 53. The mixing section 51 is connected to the inner top wall of the explosion-proof box body 1.

[0024] The isolation element 55 includes a gasket 552 and a paper sheet 551 that are fitted together, and a plurality of bolts 553. Through holes (not shown) for the bolts 553 to pass through are provided on the gasket 552 and the paper sheet 551. A plurality of threaded holes (not shown) are provided on the inner wall of the mixing section 51. The bolts 553 pass through the through holes and are screwed into the threaded holes, so that the gasket 552 positions the paper sheet 551 at the connection between the mixing section 51 and the buffer section 52. Before compressed gas is introduced into the mixing section 51, the isolation element 55 plays an isolation role between the mixing section 51 and the buffer section 52, so that the dry powder 54 is located in the mixing section 51 and will not enter the buffer section 52.

[0025] The other end of the compressed gas delivery pipe 56 extends to the outside of the explosion-proof box body 1, and the other end of the compressed gas delivery pipe 56 is connected to a gas compressor. When it is found that the lithium battery 4 is on fire, compressed gas is immediately introduced into the compressed gas delivery pipe 56. The compressed gas rushes into the mixing section 51 and is fully mixed with the dry powder 54 in the mixing section 51. At the same time, the pressure in the mixing section 51 gradually increases. When the pressure increases to a certain value, the gas-powder mixture will break through the paper sheet 551 on the isolation element 55, enter the buffer section 52, then enter the spraying section 53, and finally be sprayed out from the spraying holes 530 to extinguish the lithium battery 4 in time and prevent more serious consequences.

[0026] A sliding base 3 is further provided in the explosion-proof box body 1. A plurality of pulleys 31 are installed on the sliding base 3. A sliding groove 10 for the pulleys 31 to slide is provided on the inner bottom wall of the explosion-proof box body 1, which facilitates the pulling of the sliding base 3, saving time and effort. A handle 32 is installed on the sliding base 3 for convenient operation.

[0027] A lithium battery limiting groove 30 is provided on the sliding base 3. The lithium battery 4 is placed in the lithium battery limiting groove 30 to play a positioning role, so that the fire extinguishing mechanism 5 is just located directly above the lithium battery limiting groove 30, and the fire extinguishing effect is good.

[0028] During the failure process of the lithium battery 4, changes will occur in the lithium battery monomer structure, electrolyte state, electrode-electrolyte interface, interface reaction, stability, etc. In order to more completely detect various performance changes during the failure process of the lithium battery 4, non-destructive testing technologies such as acoustic sensors and X-ray sensors can also be used for further detection to monitor material decay, internal resistance evolution, modulus change, etc. during the life cycle of the lithium battery 4.

[0029] The series of detailed descriptions listed above are only specific descriptions of the feasible implementation modes of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent implementation modes or changes made without departing from the technical spirit of the present invention should be included in the protection scope of the present invention.

[0030] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lithium battery thermal failure detection device, characterized in that: The invention comprises an explosion-proof box (1) and an explosion-proof box door (2); a temperature sensor (61), a gas sensor (62), a smoke sensor (63), a flame sensor (64), and a fire extinguishing mechanism (5) are installed in the explosion-proof box (1); the fire extinguishing mechanism (5) comprises a mixing section (51), a buffer section (52), and a spraying section (53) which are connected in sequence, a dry powder (54) located in the mixing section (51), a compressed gas delivery pipe (56) with one end extending into the mixing section (51), and an isolation element (55) isolating the mixing section (51) from the buffer section (52); the mixing section (51) is connected to the top wall of the explosion-proof box (1), and the other end of the compressed gas delivery pipe (56) extends to the outside of the explosion-proof box (1).

2. The lithium battery thermal failure detection device according to claim 1, characterized in that: The isolation element (55) comprises a gasket (552) and a paper sheet (551) that fit together, and a plurality of bolts (553). The gasket (552) and the paper sheet (551) are provided with through holes for the bolts (553) to pass through. The inner wall of the mixing section (51) is provided with a plurality of threaded holes. The bolts (553) pass through the through holes and are screwed into the threaded holes, so that the gasket (552) presses the paper sheet (551) at the connection point between the mixing section (51) and the buffer section (52).

3. The lithium battery thermal failure detection device according to claim 2, characterized in that: The spraying section (53) is in the shape of a hollow disc, and a plurality of spraying holes (530) are provided at the bottom of the spraying section (53).

4. The lithium battery thermal failure detection device according to claim 1, characterized in that: A sliding base (3) is also provided in the explosion-proof box (1), a lithium battery limiting groove (30) is provided on the sliding base (3), and the fire extinguishing mechanism (5) is located directly above the lithium battery limiting groove (30).

5. The lithium battery thermal failure detection device according to claim 4, characterized in that: A plurality of pulleys (31) are installed on the sliding base (3), and a sliding groove (10) for the pulleys (31) to slide is provided on the inner bottom wall of the explosion-proof box (1).

6. The lithium battery thermal failure detection device according to claim 5, characterized in that: A handle (32) is installed on the sliding base (3).

7. The lithium battery thermal failure detection device according to claim 1, characterized in that: An explosion-proof window (20) is installed on the explosion-proof box door (2).

8. The lithium battery thermal failure detection device according to claim 1, characterized in that: A pressure sensor and a pressure relief valve are also installed on the explosion-proof box.

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