Lithium battery box with fire extinguishing device

Abstract

A lithium battery box with a fire extinguishing device comprises a box body, a box cover, a battery module, a battery management module and the fire extinguishing device, the fire extinguishing device comprises a control device connected with the battery management module and hot aerosol connected with the control device, and the hot aerosol is installed above a battery cavity through a bracket. The working state of the battery module can be monitored in real time through the voltage monitor, the current monitor, the temperature monitor and the smoke detector, information is fed back to the battery management module, the battery management module is connected with the control device to control hot aerosol spraying, and the temperature monitor and the smoke detector are installed between every two adjacent battery blocks. According to the invention, the battery management module can perform abnormal response more directly and more quickly, the battery module can be cooled or extinguished in time regardless of too high temperature or other abnormal conditions, the condition of thermal runaway of the battery caused by too slow response is avoided, and the safety is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery boxes, in particular to a lithium battery box with a fire extinguishing device. Background Art

[0002] With the development of vehicle technology, electric vehicle technology has become more mature, so various low-speed battery vehicles have appeared in life, such as sightseeing cars, patrol cars, golf carts and other low-speed vehicles. The battery packs in these low-speed vehicles are usually powered by lithium battery packs. Different models will be equipped with different numbers of lithium batteries according to needs to meet usage requirements. In order to match different numbers of lithium battery packs, these lithium battery packs need to be placed in the battery box to ensure the safety of the battery and facilitate the loading and unloading of the battery.

[0003] In the existing lithium battery box, such as the lithium battery box automatic fire extinguishing device disclosed in the Chinese patent with patent application number CN202222661370.2, it includes a lithium battery box, a fire extinguishing mechanism is arranged inside the lithium battery box, and the fire extinguishing mechanism includes a support frame, a perfluorohexanone fire extinguisher, a through hole, a nozzle assembly and a temperature-sensitive magnetic power generation element. A support frame is arranged inside the lithium battery box, and perfluorohexanone fire extinguishers are arranged on both sides of the top of the support frame. A through hole is arranged in the center of the support frame, and a nozzle assembly is arranged inside the through hole. The nozzle assembly is connected to the output port of the perfluorohexanone fire extinguisher. When the structure monitors the internal ambient temperature of the lithium battery box through the temperature-sensitive magnetic power generation element and exceeds the preset temperature limit, the temperature-sensitive magnetic power generation element will generate current to act on the perfluorohexanone fire extinguisher, so that the perfluorohexanone fire extinguisher is started. No external power supply is required, and the internal part of the lithium battery can be extinguished to reduce the degree of damage to the equipment at the fire source.

[0004] However, in this structure, the temperature-sensitive magnetic power generation element is arranged on the support frame of the box cover, so that the temperature-sensitive magnetic power generation element is suspended above the lithium battery in the box. Therefore, there will be a delay in monitoring the internal temperature of the box. The temperature-sensitive magnetic power generation element can often be triggered only after an open flame has appeared. At this time, the internal lithium battery is likely to experience thermal runaway and cause a large-scale fire. At this time, fire extinguishing will not have the ideal effect. The flames that cannot be suppressed will cause damage to the components inside the box. A fire extinguishing device that can monitor in real time and prevent thermal runaway of the lithium battery in time is needed. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a lithium battery box with a fire extinguishing device.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A lithium battery box with a fire extinguishing device comprises a box body, a box cover, a battery module, a battery management module and a fire extinguishing device, wherein a battery cavity for installing the battery module and an equipment cavity for installing the battery management module are provided in the box body, the battery cavity and the equipment cavity are separated by a partition, the battery management module is connected to the battery module, the fire extinguishing device is installed above the battery cavity, the fire extinguishing device comprises a control device connected to the battery management module and at least one hot aerosol connected to the control device, the hot aerosol is installed above the battery cavity through a bracket, the battery management module is connected to a voltage monitor for monitoring the voltage state of the battery module, a current monitor for monitoring the current state of the battery module, a temperature monitor for monitoring the temperature state of the battery module and a smoke detector for monitoring whether smoke appears in the battery box, the voltage monitor and the current monitor are connected to the main line, the temperature monitor and the smoke detector are installed in the battery cavity, the battery module comprises a plurality of battery blocks connected in series in sequence, two adjacent battery blocks are separated by a flame retardant plate, and the temperature monitor and the smoke detector are installed between two adjacent battery blocks.

[0008] In the utility model, the flame retardant board is an epoxy board.

[0009] In the utility model, the control device is divided into a single-zone control mode and a multi-zone control mode. In the single-zone control mode, the hot aerosol can be one or more. When the battery management module receives a signal of battery abnormality, it sends control information to the control device. The control device controls one or more hot aerosols to work synchronously to spray fire extinguishing agent into the battery box.

[0010] Furthermore, in the multi-zone control mode, the battery module is divided into multiple areas according to a certain number of battery blocks, and at least one hot aerosol is arranged in each area. When the battery management module receives a signal of battery abnormality, it sends control information to the control device. The control device controls the hot aerosol in the corresponding area to operate and sprays the fire extinguishing agent into the corresponding area inside the battery box.

[0011] In the utility model, a wiring panel is installed on the box wall on one side of the box body close to the equipment cavity. The wiring panel is connected to the battery management module. The wiring panel includes an output connector for outputting current and a communication connector for connecting a display device. The communication connector visualizes the battery status information on the display device.

[0012] In this embodiment, the battery box is used alone; or two are used in combination; or multiple battery boxes are used in combination; when two battery boxes are used in combination, the positive / negative line is led out from the output connector in the wiring panel of one of the battery boxes and connected to the negative / positive pole of the output connector in the wiring panel of the other battery box, and the line is led out from the communication connector in the wiring panel of one of the battery boxes and connected to the communication connector in the wiring panel of the other battery box.

[0013] The utility model has the following advantages and beneficial effects:

[0014] The voltage monitor, current monitor, temperature monitor and smoke detector can be used to monitor the working status of the battery module in real time and feed the information back to the battery management module. The battery management module controls the hot aerosol injection by connecting to the control device. The temperature monitor and smoke detector are installed between two adjacent battery blocks, so that the battery management module can respond to abnormalities more directly and quickly. Whether it is due to excessive temperature or other abnormal conditions, the battery module can be cooled or extinguished in time to avoid thermal runaway of the battery due to slow response, which is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0016] Figure 1 This is a schematic diagram of the installation of the lithium battery box in this embodiment;

[0017] Figure 2 This is a schematic diagram of the internal structure of the lithium battery box in this embodiment;

[0018] Figure 3 This is a top view of the internal structure of the lithium battery box in this embodiment;

[0019] Figure 4 is a connection block diagram of the fire extinguishing device and the battery management module in this embodiment;

[0020] Figure 5 Schematic diagram of the combined connection of the lithium battery box in this embodiment. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model, but the utility model is not limited to the following embodiments.

[0022] like Figures 1 to 5As shown, this embodiment discloses a lithium battery box with a fire extinguishing device, including a box body 1, a box cover 2, a battery module 3, a battery management module 4 and a fire extinguishing device 5. The box body 1 is provided with a battery cavity 10 for installing the battery module 3 and an equipment cavity 11 for installing the battery management module 4. The battery cavity 10 and the equipment cavity 11 are separated by a partition 12. The battery management module 4 is connected to the battery module 3 for monitoring the working state of the lithium battery. The fire extinguishing device 5 is installed above the battery cavity 10 and connected to the battery management module 4 for spraying a fire extinguishing agent into the battery cavity 10 to extinguish the fire or cool the battery when a fire occurs or is about to occur. Specifically, the fire extinguishing device 5 includes a control device 51 connected to the battery management module 4 and at least one control device 51 connected to the control device 5. 1 is connected to a hot aerosol 52, the hot aerosol 52 is installed above the battery cavity 10 through a bracket 53, the battery management module 4 is connected to a voltage monitor for monitoring the voltage state of the battery module 3, a current monitor for monitoring the current state of the battery module 3, a temperature monitor for monitoring the temperature state of the battery module 3, and a smoke detector for monitoring whether smoke appears in the battery box, the voltage monitor and the current monitor are connected to the main line, the temperature monitor and the smoke detector are installed in the battery cavity 10, specifically, the battery module 3 includes a plurality of battery blocks connected in series in sequence, two adjacent battery blocks are separated by a flame retardant plate 31, the temperature monitor and the smoke detector are installed between two adjacent battery blocks, and the flame retardant plate 31 is an epoxy plate.

[0023] The voltage monitor, current monitor, temperature monitor and smoke detector can monitor the working status of the battery module 3 in real time and feed the information back to the battery management module 4. The battery management module 4 controls the spraying of the hot aerosol 52 by connecting with the control device 51. The temperature monitor and the smoke detector are installed between two adjacent battery blocks, so that the battery management module 4 can respond to abnormalities more directly and quickly. Regardless of whether it is due to excessive temperature or other abnormal conditions, the battery module 3 can be cooled or extinguished in time to avoid thermal runaway of the battery due to slow response, which is safer.

[0024] In this embodiment, the control device 51 is divided into a single-zone control mode and a multi-zone control mode. In the single-zone control mode, the hot aerosol 52 can be one or more. When the battery management module 4 receives a signal of battery abnormality, it sends control information to the control device 51. Then the control device 51 controls one or more hot aerosols 52 to work synchronously and sprays fire extinguishing agent into the battery box. In the multi-zone control mode, the battery module 3 is divided into multiple areas according to a certain number of battery blocks. At least one hot aerosol 52 is arranged in each area. When the battery management module 4 receives a signal of battery abnormality, it sends control information to the control device 51. The control device 51 controls the hot aerosol 52 in the corresponding area to work and sprays fire extinguishing agent into the corresponding area inside the battery box to achieve precise fire extinguishing.

[0025] In this embodiment, a wiring panel 13 is installed on the side wall of the box body 1 close to the equipment cavity 11. The wiring panel 13 is connected to the battery management module 4. The wiring panel 13 includes an output connector for outputting current and a communication connector for connecting a display device. After connecting to an external display, the battery management module 4 can be connected through the communication connector to visualize the battery status information, which is convenient for monitoring and management.

[0026] In this embodiment, the battery box can not only be used alone, but also can be used in combination of two or more battery boxes; when two battery boxes are used in combination, the positive / negative line is led out from the output connector in one of the battery box wiring panels 13 and connected to the negative / positive pole of the output connector in the other battery box wiring panel 13 to achieve series connection. At the same time, the communication line is led out from the communication connector in one of the battery box wiring panels 13 and connected to the communication connector in the other battery box wiring panel 13, thereby realizing monitoring and management of the batteries inside the two battery boxes.

[0027] The above contents described in this specification are merely examples of the present invention. Technicians in the technical field to which the present invention belongs can make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the contents of the present invention specification or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A lithium battery box with a fire extinguishing device, comprising a box body (1), a box cover (2), a battery module (3), a battery management module (4) and a fire extinguishing device (5), wherein the box body (1) is provided with a battery cavity (10) for installing the battery module (3) and an equipment cavity (11) for installing the battery management module (4), wherein the battery cavity (10) and the equipment cavity (11) are separated by a partition (12), and the battery management module (4) is connected to the battery module (3), characterized in that: The fire extinguishing device (5) is installed above the battery cavity (10), and comprises a control device (51) connected to the battery management module (4) and at least one hot aerosol (52) connected to the control device (51); the hot aerosol (52) is installed above the battery cavity (10) via a bracket (53); the battery management module (4) is connected to a voltage monitor for monitoring the voltage state of the battery module (3), a current monitor for monitoring the current state of the battery module (3), a temperature monitor for monitoring the temperature state of the battery module (3), and a smoke detector for monitoring whether smoke appears in the battery box; the voltage monitor and the current monitor are connected to the main line; the temperature monitor and the smoke detector are installed in the battery cavity (10); the battery module (3) comprises a plurality of battery blocks connected in series in sequence, two adjacent battery blocks are separated by a flame retardant plate (31), and the temperature monitor and the smoke detector are installed between two adjacent battery blocks.

2. A lithium battery box with a fire extinguishing device according to claim 1, characterized in that: The flame retardant board (31) is an epoxy board.

3. A lithium battery box with a fire extinguishing device according to claim 1, characterized in that: The control device (51) is divided into a single-zone control mode and a multi-zone control mode. In the single-zone control mode, the thermal aerosol (52) may be one or more. When the battery management module (4) receives a signal indicating a battery abnormality, it sends control information to the control device (51). The control device (51) controls one or more thermal aerosols (52) to work synchronously to spray a fire extinguishing agent into the battery box.

4. A lithium battery box with a fire extinguishing device according to claim 3, characterized in that: In a multi-zone control mode, the battery module (3) is divided into a plurality of zones according to a certain number of battery blocks, at least one hot aerosol (52) is provided in each zone, and when the battery management module (4) receives a signal indicating a battery abnormality, control information is sent to a control device (51), and the control device (51) controls the hot aerosol (52) in the corresponding zone to operate and sprays a fire extinguishing agent into the corresponding zone inside the battery box.

5. The lithium battery box with a fire extinguishing device according to claim 1, characterized in that: A wiring panel (13) is installed on a side wall of the box body (1) close to the device cavity (11); the wiring panel (13) is connected to the battery management module (4); the wiring panel (13) includes a current output connector and a communication connector for connecting to a display device; the communication connector visually displays battery status information on the display device.

6. A lithium battery box with a fire extinguishing device according to claim 5, characterized in that: The battery box is used alone; or two are used in combination; or a plurality of battery boxes are used in combination; when two battery boxes are used in combination, a positive / negative line is led out from an output connector in a wiring panel (13) of one battery box and connected to a negative / positive terminal of an output connector in a wiring panel (13) of another battery box; and a line is led out from a communication connector in a wiring panel (13) of one battery box and connected to a communication connector in a wiring panel (13) of another battery box.

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