Lithium battery box with fireproof function and using method thereof
Technical Field
The invention relates to the technical field of energy storage, in particular to a lithium battery box with a fireproof function and a using method thereof.
Background
Large-scale power energy storage is an important support technology of energy internet, wherein battery energy storage is applied to the fields of new energy smoothing, demand response, power support, peak clipping and valley filling and the like of a power system due to the characteristics of easy site selection, flexible configuration and the like. Lithium batteries have both high power density and energy density, and have been widely used in power batteries for electric vehicles, power grid energy storage and off-grid power supplies. The functions such as the heat dissipation of battery box, the immersion of fire control agent have been considered in current lithium cell box design, but fire protection ability is not strong, can influence the effective input of fire control agent when the burning of lithium cell thermal runaway, still can arouse the intensity of a fire to stretch to adjacent battery box, leads to entire system combustion explosion.
Patent 20160175972.3 discloses a battery temperature control system for vehicle and its application method, which comprises a water pump, a radiator and a battery pack connected in series in turn to form a cooling circuit, a liquid-liquid heat exchanger with an additional heating device is added between the radiator and the battery pack, and when in use, the radiator controls the heat dissipation power according to the instant temperature of the water inlet and outlet of the radiator to cool the battery pack. The battery temperature control device disclosed in patent 201310745986.0 includes a battery module, a first heat exchanger, a second heat exchanger for exchanging heat with the battery module, and a pump for pumping heat transfer medium, and adopts a combination of a semiconductor refrigerator and a heat pipe to control the temperature of a plurality of single batteries. In both methods, auxiliary electric appliances such as a pump and a heat exchanger need to be configured, so that the energy consumption of the system is increased. Patent 201410053242.7 discloses a take extinguishing device's lithium cell, the casing is inside to be divided into two cavitys by the interlayer, is provided with the formula extinguishing device that triggers in the outer cavity, triggers the portion and is triggered, and the generator just sprays out the fire extinguishing material and plays the effect of putting out a fire, prevents that the battery explosion from catching fire. The method aims at extinguishing a single lithium battery, increases the grouping volume of the lithium batteries due to the arrangement of the inner cavity and the outer cavity, and reduces the power density of the system when being applied to a high-capacity lithium battery energy storage system. Patent 201711474949.5 discloses a power lithium cell fire prevention casing, including fire prevention casing and fire prevention apron, be equipped with the heat sink in fire prevention casing and the fire prevention apron, fill inert gas in to the battery installation layer through aerating device, reduce the operating temperature of group battery, set up fire barrier between the battery module, when the battery burning, drive the baffle main part through the carriage release lever and expand from the pivot, prevent that the fire disaster diffusion from causing bigger loss. The method employs a fire barrier to prevent the spread of fire, but does not provide a method of extinguishing fire.
The lithium cell is applied to extensive electric power energy storage, especially high power density lithium cell is under big multiplying power charge-discharge operating mode, put forward higher requirement to the security of lithium cell group, consequently need design the lithium cell case that has the fire prevention function, solve the unable rapid cooling's of traditional cooling method problem, reduce the pump simultaneously, the air conditioner, the use of other auxiliary electrical appliances such as heat exchanger, reduce the cooling energy consumption, still need carry out optimal design to the fire control of battery case, prevent under the extreme condition because the conflagration that the intensity of a fire stretchs the cause explodes even, improve lithium battery system's security.
Disclosure of Invention
The invention aims to solve the technical problem of providing a lithium battery box with a fireproof function and a using method thereof aiming at the defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a lithium battery box with a fire prevention function, comprising: the side surface of the box body is provided with a fire-fighting agent feeding port and a refrigerant feeding port; the back of the box body is provided with an exhaust valve for exhausting cooling gas in the box body, a one-way valve for maintaining the air pressure balance inside and outside the box body and an explosion-proof valve for releasing pressure in the box body under the condition of extreme fire;
the fire-fighting agent feeding port and the refrigerant feeding port are respectively connected with a fire-fighting agent conveying pipeline and a refrigerant conveying pipeline in the box body, and fire-fighting agents and refrigerants are fed into the lithium battery box through the conveying pipelines.
According to the scheme, the fire-fighting agent feeding port and the refrigerant feeding port are arranged at the top of the side face of the box body.
According to the scheme, fire extinguishing agent conveying pipeline contains a horizontal pipe and a plurality of vertical pipes, the front end of the horizontal pipe is communicated with a fire extinguishing agent feeding port, the vertical pipes are communicated with the horizontal pipe through holes in the pipe wall of the horizontal pipe, a plurality of spray heads are arranged on each vertical pipe, and the fire extinguishing agent is sprayed into the battery box through the spray heads.
According to the scheme, the refrigerant conveying pipeline comprises a transverse pipe and a plurality of vertical pipes, the front end of the transverse pipe is communicated with the refrigerant feeding opening, the plurality of vertical pipes are communicated with the transverse pipe through holes in the pipe wall of the transverse pipe, a plurality of spray heads are arranged on each vertical pipe, and the refrigerant is sprayed into the battery box through the spray heads.
According to the scheme, the vertical pipes of the fire-fighting agent conveying pipeline and the refrigerant conveying pipeline are arranged at the top of the battery box in a staggered mode.
According to the scheme, the fire-fighting agent feeding port and the refrigerant feeding port are respectively provided with a fire-fighting agent automatic control valve and a refrigerant automatic control valve.
According to the scheme, the fire-fighting agent feeding port and the refrigerant feeding port are respectively provided with a fire-fighting agent automatic control valve and a refrigerant automatic control valve which are connected with an external fire-fighting agent storage tank and an external refrigerant storage tank through pipelines.
According to the scheme, the inner diameter of the exhaust valve is 10-20 mm, the inner diameter of the one-way valve is 8-10 mm, and the inner diameter of the explosion-proof valve is 15-25 mm.
According to the scheme, the box body is a cuboid box body.
According to the scheme, the lithium battery box further comprises a primary wire groove for placing a power wire for connecting the adjacent lithium battery boxes, a secondary wire groove for placing a control wire for connecting the adjacent lithium battery boxes and a battery management unit for monitoring signals of the lithium battery temperature sensor and the smoke sensor in the box body.
A use method of a lithium battery box with a fireproof function comprises the following steps:
sealing a certain number of lithium batteries in the battery box, sending a temperature control instruction when the battery management unit monitors that the temperature of the lithium batteries exceeds a set temperature, controlling a refrigerant automatic control valve on a refrigerant input port to be opened, and inputting a refrigerant into the battery box through a vertical pipe with a plurality of spray heads in a refrigerant conveying pipeline to cool;
when the battery management unit monitors smoke signals, a fire extinguishing instruction is sent out, a fire extinguishing agent automatic control valve on the fire extinguishing agent feeding port is controlled to be opened, and fire extinguishing agent is fed into the battery box through a plurality of nozzles in the fire extinguishing agent conveying pipeline to extinguish fire.
According to the scheme, when the battery management unit monitors smoke signals, the refrigerant automatic control valve on the refrigerant input port is controlled to be opened, and meanwhile, the fire extinguishing agent and the refrigerant are input.
According to the scheme, the set temperature is set according to the safe operation temperatures of the lithium batteries of different types.
The invention has the following beneficial effects: the invention provides a lithium battery box with a fireproof function and a using method thereof.A refrigerant and a fire-fighting agent feeding port are arranged on the battery box, when a battery management unit monitors that the temperature of a lithium battery exceeds a set temperature, a refrigerant automatic control valve is adopted to feed the refrigerant, the problem that the traditional cooling modes such as air cooling and liquid cooling cannot be used for quickly cooling is effectively solved, other auxiliary electrical appliances such as a pump and an air conditioner are replaced, the cooling energy consumption is reduced, the efficiency of a lithium battery system is improved, when an extreme fire condition occurs, the fire-fighting agent is fed through the fire-fighting agent automatic control valve to extinguish the lithium battery box, meanwhile, the fire can be effectively prevented from spreading to an adjacent battery box, and the safety of the lithium battery system is improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural view of a lithium battery box with a fire-proof function according to the present invention.
Fig. 2 is a schematic top view of the lithium battery box with fire-proof function according to the present invention.
Fig. 3 is a schematic view of the internal piping arrangement of the present invention.
Fig. 4 is a schematic view of the external piping connection of the present invention.
In the figure: 1. a battery box; 2. a primary wire slot; 3. a battery management unit; 4. a secondary wire slot; 5. a fire-fighting agent feeding port; 6. a refrigerant charge port; 7. an exhaust valve, 8 and a one-way valve; 9. an explosion-proof valve; 10. a fire-fighting agent automatic control valve; 11. a refrigerant automatic control valve; 12. a fire-fighting agent delivery line; 13. a refrigerant delivery line; 14. a spray head; 15. a lithium battery; 16. a fire-fighting agent storage tank; 17. a refrigerant storage tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 and 2, the invention provides a lithium battery box with a fireproof function, which comprises a rectangular box body 1, lithium batteries 15, a primary wire groove 2, a battery management unit 3 and a secondary wire groove 4, wherein the primary wire groove 2 is provided with a power line for connecting adjacent lithium battery boxes, the secondary wire groove is provided with a control line and a power line for connecting adjacent lithium battery boxes, the lithium battery box is provided with a fire-fighting agent input port 5, a refrigerant input port 6, an exhaust valve 7, a one-way valve 8 and an explosion-proof valve 9 at the side of the box body, the fire-fighting agent input port 5 and the refrigerant input port 6 are respectively connected with a fire-fighting agent conveying pipeline 12 and a refrigerant conveying pipeline 13, the fire-fighting agent conveying pipeline 12 and the refrigerant conveying pipeline 13 are arranged at the top of the battery box 1 in a staggered manner, as shown in fig. 3, the fire-fighting agent conveying pipeline 12 and the refrigerant conveying pipeline 13 respectively comprise a transverse pipe, the fire-fighting agent and the refrigerant are sprayed into the battery box 1 through the spray head 14, and the fire-fighting agent conveying pipeline 12 and the refrigerant conveying pipeline 13 share one fire-fighting agent storage tank 16 and one refrigerant storage tank 17 respectively in a plurality of groups in parallel, as shown in fig. 4.
The working principle of the invention is as follows: seal a certain amount of lithium batteries 15 in battery box 1, in the battery operation process, when battery management unit 3 monitors that the temperature of lithium batteries 15 exceeds the set value, send the control by temperature change instruction, control refrigerant automatic control valve 11 on refrigerant input port 6 to open, put in the refrigerant to battery box 1 through the violently pipe that has a plurality of shower nozzles 15 in refrigerant conveying pipeline 12, when catching fire in battery box 1 is monitored to battery management unit 3, send the instruction of putting out a fire, control fire extinguishing agent automatic control valve 10 on fire extinguishing agent input port 5 is opened, put out a fire through the fire extinguishing agent of violently pipe that has a plurality of shower nozzles 15 in fire extinguishing agent conveying pipeline 12 to putting in battery box 1 fire extinguishing agent.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.