Power battery fire detection and automatic fire extinguishing device

Abstract

The utility model provides a power battery fire detection and automatic fire extinguishing device which comprises a battery pack lower cover installed on a new energy automobile, a plurality of water-based fire extinguishers which are linearly arranged at equal intervals are arranged on the inner walls of the front side and the rear side of the battery pack lower cover, and aerosol fire extinguishers are arranged at the tops of the water-based fire extinguishers. The sound generated by gas discharge after the pressure release valve is opened is used as an early warning signal, and the fire extinguishing action is started when either the smoke concentration or the temperature reaches the threshold value, so that the false triggering problem caused by single signal acquisition is avoided, the fire detection is more timely and accurate, and the judgment reliability is improved. The water-based fire extinguisher and the aerosol fire extinguisher are adopted for cooperative operation, the water-based fire extinguisher cools and isolates oxygen, the aerosol fire extinguisher inhibits combustion, the water-based fire extinguisher and the aerosol fire extinguisher supplement each other, a combustion area can be deeply covered, the fire extinguishing efficiency is improved, and the re-combustion possibility is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power battery fire fighting technical field, specifically related to a power battery fire detection method and automatic fire extinguishing device. BACKGROUND

[0002] With the continuous development of new energy technology, at present, many countries in the world have already made the schedule of prohibiting the sale of fuel vehicles, therefore, the new energy vehicle technology develops rapidly, and the market share of various types of new energy vehicles is rising. Once the electric vehicle power battery has a safety problem, it is easy to cause the vehicle to burn, which seriously threatens the personal and property safety of the driver and passenger.

[0003] At present, the fire detection technology applied in the power battery can only detect single smoke or temperature, however, when the battery catches fire, it will be accompanied by a series of characteristic parameter changes such as smoke, temperature, sound, etc., therefore, the existing power battery fire detection technology is still difficult to meet the timely, accurate and efficient monitoring demand.

[0004] In the prior art, the automobile power battery fire extinguishing device disclosed in the Chinese utility model patent with the authorization publication number CN220294017 is worth attention. The device applies dry powder to implement fire extinguishing operation on the battery, and the dry powder shows certain advantages in extinguishing fire, and can quickly extinguish external open fire. However, from the overall effect of extinguishing the lithium battery, it has serious defects. Since the dry powder extinguishing agent has very limited effect on reducing the internal temperature of the lithium battery, when the external open fire is extinguished, the internal temperature of the lithium battery will still be maintained at a high temperature. In this high temperature environment, the chemical reaction in the lithium battery continues, thereby continuously generating heat. With the continuous accumulation of heat, the lithium battery has a great possibility of rekindling, and in serious cases, it may even cause explosion, which will cause immeasurable damage to the personal and property safety of the driver and passenger, and cannot provide reliable protection for the safety of vehicle driving. SUMMARY

[0005] The utility model provides a kind of power battery fire detection method and automatic fire extinguishing device, to accurately, efficiently detect the fire condition possibly appeared in power battery, and quickly extinguish in the first time when fire occurs.

[0006] A kind of power battery fire detection and automatic fire extinguishing device, including the battery pack lower cover installed on new energy automobile, the battery pack lower cover front and rear two sides inner wall is provided with multiple linear equidistant arrangement water-based fire extinguisher, the water-based fire extinguisher top is provided with aerosol fire extinguisher.

[0007] Optionally, in order to better realize the utility model, the water-based fire extinguisher is provided with a temperature sensor, a smoke sensor and a high-frequency ultrasonic sensor for fire monitoring on the side close to the battery.

[0008] Optionally, in order to better realize the utility model, the buzzer is installed on the outer wall of the water-based fire extinguisher on the side close to the battery.

[0009] Optionally, in order to better realize the utility model, the aerosol fire extinguisher and the inner walls on the left and right of the lower cover of the battery pack should be kept a certain distance for ventilation and heat dissipation operation.

[0010] Optionally, in order to better realize the utility model, the number of the water-based fire extinguisher, the aerosol fire extinguisher, the temperature sensor, the smoke sensor and the high-frequency ultrasonic sensor is six.

[0011] Optionally, in order to better realize the utility model, the outer walls on the left and right of the lower cover of the battery pack are provided with pipe joints, and the pipe joints are connected with the water-based fire extinguishing agent storage tank through a hose.

[0012] Optionally, in order to better realize the utility model, the water-based fire extinguishing agent storage tank is arranged at the bottom of the trunk of the new energy automobile, and the water-based fire extinguishing agent storage tank is provided with a pipe joint at the top.

[0013] The utility model discloses an innovative point lies in, the sound that gas discharges produces after pressure relief valve opens as early warning signal, when any one of smoke concentration and temperature reaches threshold value, start fire extinguishing action, this design method has remarkable advantage, because the problem of false triggering that only relies on single signal parameter acquisition is avoided, thereby make power battery fire detection technology can more timely, more accurate function, greatly improve the reliability of power battery fire condition judgement.

[0014] The utility model discloses an innovative point lies in that water-based fire extinguisher and aerosol fire extinguisher cooperate to work, to reach better fire extinguishing effect. Among them, water-based fire extinguisher plays cooling and temperature reduction and the effect of isolating oxygen, and aerosol fire extinguisher is responsible for inhibiting combustion, and the both complement each other, can realize depth cover combustion area, significantly improve fire extinguishing efficiency, greatly reduce the possibility of power battery afterburning. ACCURATE DRAWINGS

[0015] Figure 1 It is the general structure schematic diagram of power battery fire detection and automatic fire extinguishing device provided by the utility model embodiment;

[0016] Figure 2 It is the fire extinguishing agent storage tank schematic diagram of power battery fire detection and automatic fire extinguishing device provided by the utility model embodiment;

[0017] Figure 3 The power battery fire detection method of the power battery fire detection and automatic fire extinguishing device provided by the embodiment of the utility model;

[0018] Mark explanation:

[0019] In the drawing: 1, battery pack lower cover; 2, buzzer; 3, temperature sensor; 4, smoke sensor; 5, high-frequency ultrasonic sensor; 6, aerosol fire extinguisher; 7, water-based fire extinguisher 8, spray head; 9, pipe joint; 10, water-based fire extinguishing agent storage tank Specific implementation

[0020] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme in the embodiment of the application will be described clearly and completely in combination with the drawings in the embodiment of the application. Obviously, the described embodiment is a part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the application. Embodiment

[0021] As Figure 1 shown, a power battery fire detection method and automatic fire extinguishing device, including battery pack lower cover 1, the front and rear two sides of the inner wall of battery pack lower cover 1, a plurality of water-based fire extinguishers 7 are linearly and equidistantly arranged, the top of these water-based fire extinguishers 7 is provided with aerosol fire extinguisher 6, and the two are orderly arranged to form a unique fire extinguishing combination structure.

[0022] Temperature sensor 3, smoke sensor 4 and high-frequency ultrasonic sensor 5 are installed on the side of each water-based fire extinguisher 7 close to the battery for fire monitoring, and spray head 8 is installed at the central groove of the side of water-based fire extinguisher 7 close to the battery.

[0023] A buzzer 2 is arranged on the outer wall of the side of water-based fire extinguisher 7 close to the battery, which can emit an alarm sound to warn the driver and passenger when detecting the occurrence of fire.

[0024] The aerosol fire extinguisher 6 and the water-based fire extinguisher 7 are connected through screws, when the aerosol fire extinguisher 6 is installed, the aerosol fire extinguisher 6 should keep a distance of 1 to 2 cm from the left and right inner walls of the battery pack lower cover 1 for ventilation and heat dissipation operation, to prevent the aerosol fire extinguisher 6 from failing in a normal temperature environment.

[0025] The aerosol fire extinguisher 6 is connected with the water-based fire extinguisher 7 by screws, and the two form a stable combined structure. When installing the aerosol fire extinguisher 6, special attention should be paid to the distance between the aerosol fire extinguisher 6 and the left and right inner walls of the lower cover (1) of the battery pack, and the distance between the aerosol fire extinguisher 6 and the left and right inner walls of the lower cover 1 of the battery pack should be kept between 1 to 2 cm. This layout can ensure good ventilation and heat dissipation effect. During the operation of the battery, effective ventilation and heat dissipation can prevent heat from accumulating around the aerosol fire extinguisher 6, thereby preventing the aerosol fire extinguisher 6 from failing due to excessive temperature, and ensuring that it is always in a normal temperature environment and can reliably play a fire extinguishing role at a critical moment.

[0026] Specifically, the number of water-based fire extinguishers 7, aerosol fire extinguishers 6, temperature sensors 3, smoke sensors 4 and high-frequency ultrasonic sensors 5 is six.

[0027] As shown in Figure 1 With Figure 3 The smoke sensor threshold is set to a, and the temperature sensor threshold is set to t. Considering that single signal parameter collection may lead to false triggering, when the power battery catches fire, the pressure relief valve of the battery pack opens, gas is discharged, and the sound frequency will obviously rise. Therefore, the phenomenon of significant rise in sound frequency is taken as the trigger condition for issuing a warning information, that is, the switch action. After the warning information is issued, if any one of the smoke concentration and temperature reaches its threshold value, the CPU of the new energy automobile will immediately send a fire extinguishing signal to the electromagnetic valve. At this time, the water-based fire extinguishing agent will be sprayed from the nozzle 8, and at the same time, the aerosol fire extinguisher 6 and the buzzer 2 will also start synchronously, so as to realize rapid and accurate fire warning and fire extinguishing operation.

[0028] The left and right outer walls of the lower cover 1 of the battery pack are provided with pipe joints 9, and the pipe joints 9 are connected with the water-based fire extinguishing agent storage tank 10 through a hose.

[0029] Pipe joints 9 are arranged on the outer walls of the left and right sides of the lower cover 1 of the battery pack, and these pipe joints 9 are connected with the water-based fire extinguishing agent storage tank 10 through a hose, providing a reliable channel for the delivery of fire extinguishing agent, and ensuring that the water-based fire extinguishing agent can be smoothly delivered from the storage tank 10 to the water-based fire extinguisher 7 through the hose and the pipe joint 9 during fire extinguishing.

[0030] Considering that the new energy automobile needs to ensure that the chassis has good passability during driving, the water-based fire extinguishing agent storage tank (10) is arranged at the bottom of the trunk of the new energy automobile, and a pipe joint (9) is arranged at the top of the water-based fire extinguishing agent storage tank (10).

[0031] Excluded from the process, method, article or device comprising the element is another identical element.

[0032] The above describes only the specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the present application will not be limited to these embodiments shown herein, but will be consistent with the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power battery fire detection and automatic extinguishing device, comprising a battery pack lower cover (1) installed on a new energy vehicle, characterized in that: The battery pack lower cover (1) is provided with a plurality of water-based fire extinguishers (7) arranged linearly and equidistantly on the inner walls of the front and rear sides, and the water-based fire extinguishers (7) are provided with aerosol fire extinguishers (6) on the top.

2. A power battery fire detection and automatic fire extinguishing device according to claim 1, characterized in that: The water-based fire extinguishers (7) are provided with temperature sensors (3), smoke sensors (4) and high-frequency ultrasonic sensors (5) near the battery side for fire monitoring, and the water-based fire extinguishers (7) are provided with nozzles (8) near the central groove on the battery side.

3. The power battery fire detection and automatic fire extinguishing device according to claim 1, characterized in that, It also includes a buzzer (2) installed on the outer wall of the water-based fire extinguisher (7) near the battery side.

4. The power battery fire detection and automatic fire extinguishing device according to claim 1, characterized in that: The aerosol fire extinguisher (6) is left a certain distance from the left and right inner walls of the battery pack lower cover (1) for ventilation and heat dissipation operation.

5. The power battery fire detection and automatic fire extinguishing device according to claim 1, characterized in that: The number of water-based fire extinguishers (7), aerosol fire extinguishers (6), temperature sensors (3), smoke sensors (4) and high-frequency ultrasonic sensors (5) is six.

6. The power battery fire detection and automatic fire extinguishing device according to claim 1, characterized in that: The battery pack lower cover (1) is provided with pipe joints (9) on the left and right outer walls, and the pipe joints (9) are connected with the water-based fire extinguisher storage tank (10) through a hose.

7. A power cell fire detection and automatic fire extinguishing apparatus according to claim 6, wherein: The water-based fire extinguisher storage tank (10) is arranged at the bottom of the trunk of the new energy vehicle, and the water-based fire extinguisher storage tank (10) is provided with a pipe joint (9) on the top.

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