Liquid nitrogen cooling test device for thermal diffusion of battery pack

Abstract

The utility model relates to the technical field of battery cooling, and discloses a liquid nitrogen cooling test device for thermal diffusion of a battery pack, which comprises a storage tank, a conveying pipeline, a spray head, a supercharger and a power mechanism, one end of the conveying pipeline is connected with the storage tank; the nozzle is mounted at the other end of the conveying pipeline; the supercharger is connected with the storage tank; the power mechanism is used for driving the conveying pipeline to move so that the spray head can be inserted into the connector, and when the battery pack is in thermal runaway, the spray head sprays liquid nitrogen into the battery pack. According to the utility model, the battery temperature in the battery pack can be effectively reduced, so that a fire source is effectively blocked, the battery pack re-combustion and explosion risks are avoided, and negative effects caused by thermal runaway are prevented. And moreover, after the battery pack is out of control, certain air pressure is generated in the battery pack, and the risk that liquid nitrogen cannot be smoothly sprayed out due to the fact that the air pressure flows backwards to the storage tank exists, so that the pressure can be prevented from flowing backwards through the arranged supercharger, and the liquid nitrogen is smoothly sprayed out from the spray head to extinguish fire.

Description

Technical Field

[0001] This utility model relates to the field of battery cooling technology, and in particular to a liquid nitrogen cooling test device for thermal diffusion of battery packs. Background Technology

[0002] Lithium-ion batteries, as a new type of energy, are being widely applied in the automotive manufacturing industry. After lithium-ion battery production is completed, performance testing is required, including thermal runaway performance testing of the battery pack. Currently, during thermal runaway testing of the battery pack, when thermal runaway occurs, common fire-fighting equipment is typically used to extinguish the fire by spraying extinguishing agents onto the surface of the battery pack. However, as the battery pack is an energy source, extinguishing the fire only on the surface does not effectively control the fire within the battery cells, posing a risk of reignition and explosion. Utility Model Content

[0003] The purpose of this invention is to provide a liquid nitrogen cooling test device for thermal diffusion of battery packs, so as to effectively reduce the temperature of the cells in the battery pack and prevent thermal runaway from causing adverse consequences.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The liquid nitrogen cooling test device for battery pack thermal diffusion described in this utility model includes a connector on the outer shell of the battery pack that communicates with the interior of the battery pack. The liquid nitrogen cooling test device comprises:

[0006] Storage tanks used to store liquid nitrogen;

[0007] A delivery pipeline, one end of which is connected to the storage tank;

[0008] The nozzle is installed at the other end of the delivery pipe;

[0009] A booster is connected to the storage tank;

[0010] A power mechanism is used to drive the delivery pipe to move so that the nozzle is inserted into the connector.

[0011] When thermal runaway occurs inside the battery pack, the nozzle sprays liquid nitrogen into the battery pack.

[0012] In some embodiments, a teleoperator and a display are also included, the teleoperator being communicatively connected to the power mechanism and the display being used to monitor the operation of the power mechanism.

[0013] In some embodiments, the booster is mounted on the delivery pipeline.

[0014] In some embodiments, the storage tank is further connected to an installation pipe, and the booster is mounted on the installation pipe.

[0015] In some embodiments, the delivery pipeline includes a main delivery pipe and a plurality of branch delivery pipes, one end of each branch delivery pipe is connected to the main delivery pipe, the other end of each branch delivery pipe is equipped with a nozzle, and each nozzle has a corresponding connector.

[0016] In some embodiments, the connectors corresponding to the nozzles installed on each of the delivery branches are arranged at circumferential intervals along the housing.

[0017] In some embodiments, the liquid nitrogen cooling test apparatus further includes a control valve mounted on the delivery pipeline.

[0018] In some embodiments, the liquid nitrogen cooling test apparatus further includes a controller, and the control valve is electrically connected to the controller.

[0019] In some embodiments, the liquid nitrogen cooling test apparatus further includes a pressure sensing element mounted on the delivery pipeline.

[0020] In some embodiments, the liquid nitrogen cooling test apparatus further includes a trolley, and the storage tank is fixed to the trolley.

[0021] Compared with the prior art, the liquid nitrogen cooling test device for battery pack thermal diffusion according to this embodiment of the utility model has the following advantages:

[0022] This utility model discloses a liquid nitrogen cooling test device for battery pack thermal runaway, comprising a storage tank, a delivery pipeline, a nozzle, a booster, and a power mechanism. The storage tank stores liquid nitrogen for fire extinguishing. When the battery pack experiences thermal runaway, the power mechanism drives the delivery pipeline to move, bringing the nozzle connected to the pipeline close to the battery pack and inserting it into a connector on the battery pack's outer shell. This establishes communication between the delivery pipeline and the internal space of the battery pack. Liquid nitrogen is then sprayed into the battery pack through the nozzle, reducing the internal battery temperature and extinguishing the runaway battery fire. This effectively blocks the ignition source, preventing the risk of battery pack reignition and explosion, and preventing adverse consequences from thermal runaway. Furthermore, since a certain amount of pressure is generated inside the battery pack after runaway, there is a risk of backflow into the storage tank, preventing the liquid nitrogen from being sprayed out smoothly. This application incorporates a booster to prevent backflow, ensuring that the liquid nitrogen in the storage tank is smoothly sprayed from the nozzle for fire extinguishing. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the liquid nitrogen cooling test device for battery pack thermal diffusion described in this embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the liquid nitrogen cooling test device for battery pack thermal diffusion according to another embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the remote operator in an embodiment of this utility model;

[0026] Figure 4 This is a schematic diagram of the display in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the battery pack in an embodiment of this utility model.

[0028] Numbering on the map:

[0029] 1. Storage tank; 2. Delivery pipeline; 3. Nozzle; 4. Booster; 5. Installation pipe; 6. Control valve; 7. Pressure sensing element; 8. Battery pack; 81. Housing; 811. Connector; 812. Vent valve; 82. Battery; 9. Power mechanism; 91. Remote controller; 92. Display. Detailed Implementation

[0030] In the description of this utility model, it should be noted that the terms "center," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0033] See Figures 1-5As shown, this utility model embodiment provides a liquid nitrogen cooling test device for battery pack thermal runaway testing. The device is used in battery pack thermal runaway testing. The outer shell 81 of the battery pack 8 is provided with a connector 811 communicating with the interior of the battery pack 8. The liquid nitrogen cooling test device includes a storage tank 1, a delivery pipe 2, a nozzle 3, a booster 4, and a power mechanism 9. The storage tank 1 is used to store liquid nitrogen; one end of the delivery pipe 2 is connected to the storage tank 1; the nozzle 3 is installed at the other end of the delivery pipe 2; the booster 4 is connected to the storage tank 1; the power mechanism 9 is used to drive the delivery pipe 2 to move, so that the nozzle 3 is inserted into the connector, allowing the delivery pipe 2 to communicate with the interior of the battery pack 8; when the battery pack 8 experiences thermal runaway, the nozzle 3 sprays liquid nitrogen into the battery pack 8.

[0034] In the battery pack thermal runaway test, when battery 82 in battery pack 8 experiences thermal runaway, the nozzle 3 is inserted into connector 811 to connect the delivery pipe 2 to the internal space of battery pack 8. Liquid nitrogen is then sprayed into battery pack 8 through nozzle 3, effectively reducing the internal temperature of battery pack 8 and extinguishing the runaway battery 82. This effectively blocks the ignition source, avoids the risk of reignition and explosion of battery pack 8, and prevents adverse consequences caused by thermal runaway. Furthermore, since a certain amount of pressure is generated inside battery pack 8 after it runs away, there is a risk that the pressure may backflow into storage tank 1, preventing the liquid nitrogen from being sprayed out smoothly. This application uses a pressure booster 4 to prevent backflow, allowing the liquid nitrogen in storage tank 1 to be sprayed out smoothly from nozzle 3 for fire extinguishing.

[0035] To prevent excessive pressure inside the battery pack 8, a vent valve 812 is provided on the battery pack 8. Opening the vent valve 812 can release the pressure inside the battery pack 8 and also ensure that liquid nitrogen is sprayed out smoothly.

[0036] See Figure 1 and Figure 2 As shown, the power mechanism 9 can be a remotely operated robotic arm that grasps and moves the conveying pipe 2; or it can be a hoisting device that lifts and moves the conveying pipe 2. Using a power mechanism to drive the conveying pipe 2 and thus the nozzle 3 reduces manual intervention. It should be noted that, since the conveying pipe 2 has a certain length, when the conveying pipe 2 moves, only the portion connected to the nozzle 3 moves, avoiding the conveying pipe 2 from moving the storage tank 1 synchronously and increasing power consumption.

[0037] See Figures 1-4 As shown, when the power mechanism 9 is a remotely operated robotic arm, the liquid nitrogen cooling test device also includes a remote operator 91 and a display 92. The remote operator 91 is communicatively connected to the remotely operated robotic arm to remotely control its movement. The display 92 is used to monitor the movement of the remotely operated robotic arm, facilitating precise control and ensuring accurate docking of the nozzle 3 with the corresponding connector 811.

[0038] In some embodiments, the storage tank 1 is a liquid nitrogen tank with a certain pressure and airtightness, allowing liquid nitrogen to flow smoothly out of the storage tank 1. The liquid nitrogen cooling test device also includes a trolley, on which the storage tank 1 is fixed, facilitating the movement of the storage tank 1 and thus enabling the power mechanism 9 to drive the nozzle 3 closer to the battery pack 8; and preventing operators from touching the storage tank 1 and suffering frostbite. Furthermore, placing the storage tank 1 on the trolley facilitates pressure relief protection operations on the storage tank 1.

[0039] See Figure 1 In some embodiments, the booster 4 is installed on the delivery pipeline 2 to provide power for the delivery of liquid nitrogen and to prevent the pressure inside the battery pack 8 from flowing back into the storage tank 1, which would prevent the liquid nitrogen from being sprayed out smoothly.

[0040] See Figure 2 In other embodiments, the storage tank 1 is also connected to an installation pipe 5, and the booster 4 is installed on the installation pipe 5. The installation pipe 5 is fixed to the side wall of the storage tank 1 and extends into the interior of the storage tank 1. The installation pipe 5 and the delivery pipe 2 are two independent pipes. It should be noted that the connection between the installation pipe 5 and the storage tank 1 is sealed to prevent liquid nitrogen from overflowing.

[0041] In some embodiments, the booster 4 is cryogenic and is a liquid nitrogen pump that provides power for the transport of liquid nitrogen in the storage tank 1.

[0042] In some embodiments, the delivery pipeline 2 includes a main delivery pipe and multiple branch delivery pipes. One end of each branch delivery pipe is connected to the main delivery pipe, and the other end of each branch delivery pipe is equipped with a nozzle 3. Using multiple nozzles 3 to cool the battery pack 8 can improve cooling efficiency and prevent the fire from spreading too far. Each nozzle 3 installed on each branch delivery pipe has a corresponding connector 811. The connectors 811 are arranged circumferentially along the outer casing 81, so that liquid nitrogen can be sprayed circumferentially into the battery pack 8 through multiple nozzles 3 for rapid fire extinguishing and cooling. Furthermore, when multiple batteries 82 in the battery pack 8 experience thermal runaway, the multiple nozzles 3 can improve the efficiency of fire extinguishing and cooling of multiple thermally runaway cells, preventing the thermal runaway area from spreading significantly.

[0043] To facilitate adjustment of the position of the conveying pipe 2, in some embodiments, the conveying pipe 2 is a flexible hose, and the selected hose has heat insulation capabilities to prevent condensation. Both the main conveying pipe and the branch conveying pipes in the conveying pipe 2 can be flexible hoses.

[0044] See Figure 1 and Figure 2In some embodiments, the liquid nitrogen cooling test device further includes a control valve 6, which is installed on the delivery pipeline 2 to facilitate the control of the opening and closing of the delivery pipeline 2, thereby controlling whether the nozzle 3 can spray liquid nitrogen. The control valve 6 is a solenoid valve. In some embodiments, the control valve 6 can be remotely controlled to avoid operators operating the control valve 6 at close range, which could pose a safety hazard due to its proximity to the thermal runaway location of the battery pack 8. The liquid nitrogen cooling test device also includes a controller, and the control valve 6 is electrically connected to the controller. The controller controls the control valve 6. The controller is a remote controller.

[0045] See Figure 1 and Figure 2 In some embodiments, the liquid nitrogen cooling test device further includes a pressure detection element 7, installed on the delivery pipeline 2. The pressure detection element 7 is used to detect the liquid nitrogen pressure in the delivery pipeline 2, preventing the liquid nitrogen pressure from being too low, which would prevent the nozzle 3 from successfully spraying liquid nitrogen, and also preventing the liquid nitrogen pressure from being too high, which would result in energy waste. The pressure detection element 7 is a pressure gauge, installed on the delivery pipeline 2 and near the outlet of the liquid nitrogen tank. In some embodiments, the pressure detection element 7 and the booster 4 are electrically connected to a controller. The pressure detection element 7 feeds back a pressure detection signal to the controller, and the controller controls the pressure of the booster 4 to ensure that the liquid nitrogen in the storage tank 1 can be successfully sprayed out through the nozzle 3.

[0046] It should be noted that the liquid nitrogen cooling test device of this application can be applied to new energy vehicle battery, power battery testing and evaluation laboratories and related battery testing sites.

[0047] The working process of this utility model is as follows:

[0048] During the thermal runaway test of the battery pack 8, when the battery 82 inside the pack experiences thermal runaway, the liquid nitrogen cooling test device of this application is used for fire extinguishing and cooling. The nozzle 3 is connected to the connector 811 on the outer shell 81 of the battery pack 8 via the power mechanism 9. Liquid nitrogen is sprayed into the battery pack 8 through the nozzle 3 to reduce the internal temperature of the battery pack 8, thereby lowering the temperature of the runaway battery, extinguishing the fire at the location of the runaway battery, blocking the ignition source, and preventing the battery pack 8 from reigniting.

[0049] In summary, this utility model embodiment provides a liquid nitrogen cooling test device for battery pack thermal runaway, including a storage tank 1, a delivery pipe 2, a nozzle 3, a booster 4, and a power mechanism. The storage tank 1 stores liquid nitrogen for fire extinguishing. When the battery pack 8 experiences thermal runaway, the power mechanism 9 drives the delivery pipe 2 to move, causing the nozzle 3 connected to the delivery pipe 2 to approach the battery pack 8 and be inserted into the connector 811 on the outer shell 81. This connects the delivery pipe 2 to the internal space of the battery pack 8, and the nozzle 3 sprays liquid nitrogen into the battery pack 8, reducing the internal temperature of the battery pack and effectively lowering the battery temperature inside the battery pack 8. This extinguishes the runaway battery, effectively blocking the ignition source, avoiding the risk of reignition and explosion of the battery pack 8, and preventing adverse consequences caused by thermal runaway. Furthermore, since a certain amount of gas pressure will be generated inside the battery pack 8 after it goes out of control, there is a risk that this pressure will backflow into the storage tank 1, preventing the liquid nitrogen from being sprayed out smoothly. This application, through the addition of a pressure booster 4, can prevent this backflow, allowing the liquid nitrogen in the storage tank 1 to be smoothly sprayed out from the nozzle 3 for fire extinguishing. Moreover, this application uses liquid nitrogen as a flame retardant, which will not cause environmental pollution and has a high level of safety. The liquid nitrogen cooling test device of this application has a simple structure, is easy to operate, and can effectively control costs.

[0050] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A liquid nitrogen cooling test device for battery pack thermal diffusion, characterized in that, The outer shell (81) of the battery pack (8) is provided with a connector (811) communicating with the interior of the battery pack (8), and the liquid nitrogen cooling test device includes: Storage tank (1) for storing liquid nitrogen; The conveying pipeline (2) is connected at one end to the storage tank (1); The nozzle (3) is installed at the other end of the conveying pipe (2); A booster (4) is connected to the storage tank (1); A power mechanism (9) is used to drive the conveying pipe (2) to move so that the nozzle (3) is inserted into the connector; When thermal runaway occurs inside the battery pack (8), the nozzle (3) sprays liquid nitrogen into the battery pack (8).

2. The liquid nitrogen cooling test apparatus for battery pack thermal diffusion according to claim 1, characterized in that, It also includes a remote controller (91) and a display (92), the remote controller (91) being communicatively connected to the power mechanism (9), and the display (92) being used to monitor the operation of the power mechanism (9).

3. The liquid nitrogen cooling test apparatus for battery pack thermal diffusion according to claim 1, characterized in that, The booster (4) is installed on the delivery pipe (2).

4. The liquid nitrogen cooling test apparatus for battery pack thermal diffusion according to claim 1, characterized in that, The storage tank (1) is also connected to an installation pipe (5), and the booster (4) is installed on the installation pipe (5).

5. The liquid nitrogen cooling test apparatus for battery pack thermal diffusion according to claim 1, characterized in that, The conveying pipeline (2) includes a main conveying pipe and multiple branch conveying pipes. One end of each branch conveying pipe is connected to the main conveying pipe, and the other end of each branch conveying pipe is equipped with a nozzle (3). Each nozzle (3) has a corresponding connector (811).

6. The liquid nitrogen cooling test apparatus for battery pack thermal diffusion according to claim 5, characterized in that, The connectors (811) corresponding to the nozzles (3) installed on each of the conveying branch pipes are arranged at circumferential intervals along the outer casing (81).

7. The liquid nitrogen cooling test apparatus for battery pack thermal diffusion according to claim 1, characterized in that, The liquid nitrogen cooling test device also includes a control valve (6), which is installed on the delivery pipeline (2).

8. The liquid nitrogen cooling test apparatus for battery pack thermal diffusion according to claim 7, characterized in that, The liquid nitrogen cooling test device also includes a controller, and the control valve (6) is electrically connected to the controller.

9. The liquid nitrogen cooling test apparatus for battery pack thermal diffusion according to claim 1, characterized in that, The liquid nitrogen cooling test device also includes a pressure detection element (7), which is installed on the delivery pipeline (2).

10. The liquid nitrogen cooling test apparatus for battery pack thermal diffusion according to claim 1, characterized in that, The liquid nitrogen cooling test device also includes a trolley, and the storage tank (1) is fixed on the trolley.

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