CN108853837B - Walk-in temperature test device - Google Patents
Walk-in temperature test device Download PDFInfo
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- CN108853837B CN108853837B CN201810869344.4A CN201810869344A CN108853837B CN 108853837 B CN108853837 B CN 108853837B CN 201810869344 A CN201810869344 A CN 201810869344A CN 108853837 B CN108853837 B CN 108853837B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/005—Delivery of fire-extinguishing material using nozzles
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C99/00—Subject matter not provided for in other groups of this subclass
- A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
- A62C99/0072—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using sprayed or atomised water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a walk-in temperature test device, which at least comprises: the box body is internally provided with at least one first box chamber for accommodating a test sample, and one surface of the first box chamber can be opened and closed to allow the test sample to enter and exit; the sensor is arranged in the box body and used for monitoring the temperature and fire information of the test article; the three-level fire extinguishing system consists of a fire extinguisher fire extinguishing system, a spray fire extinguishing system and a submerged fire extinguishing system; the three-level fire extinguishing system can be opened and closed singly or in combination according to fire information. The beneficial effects of the invention are as follows: (1) The fire condition is monitored by various sensors, the multi-stage fire extinguishing protection is realized, the safety level is high, and the automation degree is high; (2) The fire extinguisher fire extinguishing system is arranged in the test device and participates in fire extinguishment for the first time after the fire is generated; (3) Two samples can be tested simultaneously or a single sample can be tested, and the flexibility is high; (4) When the fire condition is too large, the fire fighting water submerges the inside of the whole test device and the test article, so that explosion danger is avoided.
Description
Technical Field
The invention relates to a walk-in temperature test device, in particular to a temperature test device with multiple protection functions, and belongs to the technical field of detection of power batteries for new energy vehicles.
Background
When the new energy automobile is actually used, the working environment is various, the temperature is high and can reach forty-fifty degrees, and the temperature is low and is about forty-four degrees below zero. If the new energy automobile is designed without considering the factors, the automobile safety is not guaranteed. So that each large host factory requires that the new energy battery assembly must pass through the wet and hot cycle in the model test. In response to this requirement, high and low temperature test chambers have been developed.
Since the temperature test chamber itself simulates the working environment of the battery assembly in the extreme environment, it is a safety risk. And the temperature test equipment on the market at present only alarms according to the safety problem. Once the internal temperature is detected to exceed the set value, an alarm is given, and then the fire extinguisher outside the equipment is manually taken out for extinguishing fire or is directly evacuated.
This setting is risky in the following points: (1) The reason for triggering the alarm is single, the alarm is given only when the temperature is ultrahigh, and the alarm cannot be timely prevented from other aspects; (2) Once the temperature alarm fails, the temperature alarm is completely out of control, and no safety alarm is controlled; (3) The equipment has no follow-up measures after alarming, and the fire extinguisher needs to be taken manually, so that the vacuum time is shortened, and the economic loss is increased.
In the existing temperature test box, the fire extinguisher is an independent individual, and when a fire disaster actually occurs, the steps are as follows: (1) finding a fire; (2) finding a fire extinguisher; (3) moving the fire extinguisher to the gate of the incubator; (4) opening a temperature box door; (5) extinguishing a fire using a fire extinguisher. This step delays the fire extinguishing time and the opening of the door is unsafe.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the safe and reliable temperature test device is provided, when the sample is Wen Zhaohuo high, different fire extinguishing measures are adopted, and economic losses are reduced.
In order to solve the above technical problems, the present invention provides a walk-in temperature test apparatus, which at least includes:
the box body is internally provided with at least one first box chamber for accommodating a test sample, and one surface of the first box chamber can be opened and closed to allow the test sample to enter and exit;
the sensor is arranged in the box body and used for monitoring the temperature and fire information of the test article;
the three-level fire extinguishing system consists of a fire extinguisher fire extinguishing system, a spray fire extinguishing system and a submerged fire extinguishing system; the three-level fire extinguishing system can be opened and closed singly or in combination according to fire information.
Further, the fire extinguishing pipeline of the fire extinguisher fire extinguishing system is arranged on the left side face, the right side face, the rear side face and the top face of the inner wall of the first box chamber, and each face of the inner wall is provided with at least two fire extinguishing agent outlets facing the test sample. The fire extinguishing pipelines on the left side face, the right side face and the rear side face of the inner wall are divided into an upper layer and a lower layer, and each layer is provided with at least two fire extinguishing agent outlets.
Further, a first spray pipeline of the spray fire extinguishing system is arranged outside the top of the box body, and a spray water outlet of the first spray pipeline penetrates through the top of the box body and faces the test sample. The first box chamber is internally provided with a first shortcut interface; the bearing device for bearing the test sample is provided with a second spray pipeline which is provided with a second shortcut interface; the first shortcut interface can be connected with the second shortcut interface. The water pressure range of the spray water in the first spray pipeline is 0.2 MPa-0.5 MPa, and the flow of the spray water is more than or equal to 12m 3 /h。
Further, the immersed fire extinguishing system adopts fire water to immerse and extinguish fire, the water pressure range of the fire water is 0.2 MPa-0.5 MPa, and the flow rate of the fire water is more than or equal to 24m 3 /h。
Further, a pressure relief device is arranged at the top of the box body, and the pressure relief device is provided with a protection structure.
Further, the sensor includes a barometric pressure sensor, a temperature sensor, a smoke sensor, a carbon monoxide concentration sensor, a hydrocarbon concentration sensor. The temperature sensor collects the surface temperature of the sample and the temperature in the box.
The beneficial effects of the invention are as follows:
(1) The fire condition is monitored by various sensors, the multi-stage fire extinguishing protection is realized, the safety level is high, and the automation degree is high;
(2) The fire extinguisher fire extinguishing system is arranged in the test device and participates in fire extinguishment for the first time after the fire is generated;
(3) Two samples can be tested simultaneously or a single sample can be tested, and the flexibility is high;
(4) When the fire condition is too large, the fire fighting water submerges the inside of the whole test device and the test article, so that explosion danger is avoided.
Drawings
FIG. 1 is a schematic view showing the structure of a temperature test apparatus according to a preferred embodiment of the present invention from the front upper view;
FIG. 2 is a schematic view showing the structure of the temperature test apparatus according to the preferred embodiment of the present invention from the front lower view;
FIG. 3 is a schematic view showing the structure of a rear upper view of a temperature test apparatus according to a preferred embodiment of the present invention;
FIG. 4 is a schematic view showing the internal structure of a temperature test apparatus according to a preferred embodiment of the present invention;
FIG. 5 is a schematic view showing the structure of an electronic door of a temperature testing apparatus according to a preferred embodiment of the present invention;
FIG. 6 is a schematic diagram showing functional blocks of a temperature testing apparatus according to a preferred embodiment of the present invention;
FIG. 7 is a schematic diagram of the workflow of a temperature testing apparatus in a preferred embodiment of the invention;
FIG. 8 is a schematic diagram of a primary-secondary sample carrying device according to a preferred embodiment of the present invention;
FIG. 9 is a schematic diagram of a temperature testing device and a primary and secondary sample carrying device according to a preferred embodiment of the present invention.
In the above figures:
100. box body
110. First chamber
111. Electronic door
112. Rail track
113. Pressure relief device
114. Protective structure
115. Air pressure balance hole
120. Second chamber
130. Third chamber
131. Small door
132. Display screen
133. Audible and visual alarm
134. Fire extinguishing agent tank
210. Fire extinguishing pipeline
212. Fire extinguishing agent outlet
220. Spray pipeline
221. Spray water inlet
222. Spray water outlet
230. Immersed pipeline
231. Submerged water inlet
232. Submerged water outlet
300. Primary and secondary car
310. Mother car
311. Shortcut interface
320. Sub-vehicle
Detailed Description
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
Fig. 1 to 3 show schematic structural views of a walk-in temperature test apparatus at different angles, with two electronic doors hidden for convenience of observation. The device consists of a box body 100, a safety protection system, a temperature and humidity circulating system, a heating and refrigerating system, an electric control system and the like. The outer dimensions of the case 100 were approximately 2240×4515×1820mm (deep×wide×high), the outer case was made of 1mm thick steel plate, and the inside was fully welded with 1mm 304 stainless steel. The test temperature range of the box body is as follows: -40-100 ℃, temperature fluctuation range: + -0.5deg.C.
The case 100 is divided into three chambers: the first chamber 110, the second chamber 120, and the third chamber 130. The first chamber 110 is a main chamber, and has a maximum volume and a size of about 2000×3000×1500mm (depth×width×height). The outer layer and the inner layer of the first box 110 are provided with a high-strength PU foaming insulation layer and a glass wool heat insulation layer, and the total thickness of the heat insulation layer is 100mm. The first housing 110 has two open-close type electronic doors 111, and the thickness of the electronic doors 111 is greater than 100mm, as shown in fig. 5. The electronic door 111 is provided with two multi-layer hollow observation windows, the observation windows are insulated by vacuum glass, and the surfaces of the observation windows are covered with explosion-proof films, so that the electronic door can be prevented from being exposed, frosted and exploded. The electronic door 111 cannot be opened during operation. The bottom of the first housing 110 is provided with a rail 112, which is engaged with wheels of the sub-cart 320, and a transport specimen (battery pack) is entered from the electronic door 111 and accommodated in the first housing 110.
The top of the first box 110 is provided with a pressure relief device 113 communicated with the outside, and the pressure relief device 113 is provided with a protection structure 114. When the pressure in the first chamber 110 increases rapidly due to an abnormal operation state, the pressure relief device 113 is automatically opened to relieve the destructive pressure in the chamber. The guard structure 114 limits the height to which the pressure relief device 113 springs up. The first chamber 110 is internally provided with two moistureproof and explosion-proof lighting lamps. A camera is installed on the side and top of the first chamber 110, the ignition condition of the sample in the first chamber 110 is monitored, and the video signal is connected to a special computer.
The second chamber 120 is located beside the first chamber 110 and is used for accommodating a temperature and humidity circulation system, a heating and refrigerating system, an electric control system and the like, as shown in fig. 4. The third compartment 130 is located beside the second compartment 120 and a fire extinguishing agent tank 134 is placed within the third compartment 130, the fire extinguishing agent tank 134 being filled with heptafluoropropane fire extinguishing agent. The heptafluoropropane is a clean gas chemical fire extinguishing agent which mainly takes chemical fire extinguishment and has physical fire extinguishment effect, is colorless, odorless, low in toxicity, nonconductive and free from polluting protected objects, and cannot damage properties and precise facilities. Because of the above characteristics, the heptafluoropropane fire extinguishing agent is particularly suitable for fire extinguishing in battery packs. The third compartment 130 has a small door 131 with a display 132 and an audible and visual alarm 133 on the top. Both the display 132 and audible and visual alarms 133 may be used to monitor and display the operating status of the test device for feedback from the operator or system.
The security protection system is the focus of the present invention. The safety protection system consists of various sensors and a three-level fire extinguishing system. The sensor is installed in the case 100 for detecting temperature and fire information of the test article. The sensor comprises: air pressure sensor, temperature sensor, sample temperature sensor, smoke sensor, carbon monoxide concentration sensor, hydrocarbon concentration sensor, etc., as shown in fig. 6.
When the battery pack generates thermal runaway, a large amount of gas can be generated, and when the internal and external pressure difference exceeds 800Pa, the air pressure sensor gives an alarm. When the pressure alarms, the pressure release device 113 is firstly opened to release the pressure rapidly, and meanwhile, the test device stops working to remind a person to judge or the system to judge automatically what fire extinguishing measures are carried out.
The multichannel temperature sensor collects the surface temperature of the battery pack and the temperature in the box body. When the temperature of the battery pack is higher than the temperature overtemperature protection value in the test, the temperature alarm can give an alarm. At this time, the test device stops working, and reminds a person to judge or the system automatically judges which fire extinguishing measure is carried out.
The battery pack may generate a combustible gas in case of leakage, and the sensor of the combustible gas (carbon monoxide concentration sensor, hydrocarbonObject concentration sensor and the like) for detecting combustible gas (CO/H) in a tank 2 /C x H x ) And after the concentration reaches an alarm value, an audible and visual alarm is sent out. When the combustible gas alarms, the test device stops working, and reminds the manual judgment or the system to automatically judge what fire extinguishing measures are carried out. The test device is equipped with an automatic air inlet and exhaust device, and is controlled by a panel operation switch to perform an air exhaust action, so that external air is rapidly and largely introduced from the air pressure balance hole 115, and harmful gas in the box is exhausted and connected to the outside of the laboratory through an air exhaust pipe.
The battery pack has any smoke generation in the test, and the smoke alarm can give an alarm. At this time, the test device stops working, and reminds a person to judge or the system automatically judges which fire extinguishing measure is carried out.
Aiming at the limitation of the existing test equipment in the aspect of safety protection, the temperature test device is provided with a multiple fire extinguishing mechanism, and comprises: fire extinguisher fire extinguishing system, spray fire extinguishing system, submerged fire extinguishing system. To cope with different fires, and to take account of the economic losses resulting therefrom, the three-stage fire extinguishing system is started alone or in combination to take part in extinguishing a fire.
The battery pack is characterized in that water cannot enter, and internal modules and electric parts are scrapped once water enters. If the battery pack starts smoking, the battery pack is directly irrigated to be submerged, and the whole battery pack is not used, so that larger loss is caused. At this time, a fire extinguisher is adopted to extinguish the fire properly. When the fire is large, the fire extinguisher cannot meet the fire extinguishing requirement, and a large amount of spray water is adopted to extinguish the fire and cool the battery pack, so that a practical method is adopted, and more loss caused by the expansion of the fire is avoided. When the fire is very big, fire extinguisher and spray can not reach the effect of putting out a fire rapidly, and the battery package is possible to explode at any time. If the fire is not extinguished, the explosion is affirmed; if fire is extinguished, the safety of personnel is difficult to ensure. At this time, the starting is used for submerged fire extinguishing, so that the battery pack and the whole box body are filled with water, and explosion is avoided. The structure of the three-stage fire extinguishing system and the fire extinguishing method are described in further detail below:
when the battery inside the case burns during testing, high temperatures are generated. The system is provided with 12 temperature sensors which are placed at different positions on the surface of the battery pack, any one of the temperature sensors can trigger an alarm when exceeding a set value, and other alarms can work simultaneously and alarm. After receiving alarm signals (pressure alarm, temperature alarm, combustible gas and smoke alarm), the system can automatically judge, and can also manually select a fire extinguisher to extinguish fire according to actual conditions, a spraying system to extinguish fire or a submerged system to extinguish fire.
The fire extinguisher fire extinguishing line 210 is disposed at the inner wall of the first housing 110, including the left side, right side, rear side and top surface of the inner wall. The fire extinguishing line 210 is divided into upper and lower connected paths, which are respectively disposed at the upper and lower portions of the inner wall, and one path of the top surface. Each fire extinguishing pipeline 210 has two water outlets 212 facing the test sample on each surface, so that 14 fire extinguishing agent outlets 212 spray fire extinguishing agent in total, and each surface except the bottom surface of the test sample can be sprayed. The fire suppressant inlet communicates to a fire suppressant tank 134.
When any alarm appears in the test device, the system can be directly selected to spray the heptafluoropropane fire extinguishing agent into the test box by manual judgment. Fire extinguishing agents are the least difficult and also the least costly, but the worst fire extinguishing effect. Under the condition of small fire, the fire extinguisher is directly used for extinguishing fire, most parts can be reserved, and the economic loss is minimum.
The body of the shower line 220 is disposed on top of the outside of the cabinet 100, and the shower water outlet 222 penetrates the cabinet 100 and faces the test article, and the shower water inlet 221 is connected to the back of the cabinet 100, see fig. 3. Because the battery pack is provided with two layers, namely an upper layer and a lower layer, under the condition of larger fire, water is generally sprayed to all parts of the battery pack in a spraying mode, so that the situation that water is sprayed can be guaranteed no matter what parts catch fire. The present invention solves this problem by having in fact two layers of sprays within the incubator, four nozzles per layer, above the test sample, with the upper layer of sprays being disposed on the top wall of the first chamber 110 and the lower layer of sprays being disposed on the parent-child vehicle 300 carrying the test sample. The mother-son vehicle 300 is composed of a mother-son vehicle 310 and a son-son vehicle 320 as shown in fig. 8; the first box 110 is internally provided with a shortcut interface, and the sub-vehicle 320 is also provided with a spray pipeline and is provided with a shortcut interface 311; the two shortcut interfaces can be connected, and the sub-vehicle 320 can also spray water. Thus, in the state that two samples are tested simultaneously, the two samples can be sprayed by spraying water, and the design is ingenious.
When any alarm appears in the test box, the system can be directly selected to extinguish fire by a spraying method in the test box by manual judgment. The spray water is common life and working water, the water pressure of the spray fire-extinguishing water is 0.2 MPa-0.5 MPa, and the flow is more than or equal to 12m 3 And/h. Spraying fire extinguishment is the highest in difficulty and high in implementation cost. When the fire is slightly large, the spraying fire is used for extinguishing, and individual parts can be used without damaging the temperature box. The spray pipeline is water-filled in the initial stage, and can be directly used.
Once the method can not effectively prevent fire, the fire water is manually judged to be directly connected and poured into the test box, the whole test box is filled with water for cooling and extinguishing fire, the water pressure is 0.2MPa to 0.5MPa, the water inlet temperature of equipment is less than or equal to 32 ℃, and the fire water flow rate is more than or equal to 24m 3 And/h. The immersed fire extinguishing adopts fire water immersion, the immersed pipeline 230 is relatively short, the immersed water inlet 231 is positioned on the side surface of the box body 100, the immersed water outlet 232 is positioned on the back wall of the first box chamber 110, and water is rapidly injected into the whole first box chamber 110. The whole battery pack is immersed in water in a very short time, and the risks of ignition and explosion are thoroughly solved. The submerged pipes can be pre-connected due to the fire water involved. The quick connector is connected with the fire-fighting water pipe, and when serious conditions occur, the immersion is realized in a short time, and the ideal state is within 5 minutes. The cost of submerged fire suppression is highest. In this case, the battery pack is essentially discarded, and there is also a great loss to the sensors of the incubator itself and the like.
Through the four types of alarm three fire extinguishing modes, various safety risks generated during high-low temperature tests of the battery pack can be avoided. It should be noted that this is not three independent systems, and when the sprinkler is opened, the default extinguisher will also work together to extinguish the fire; when the submerged fire extinguishing is opened, the spraying and the fire extinguisher are simultaneously operated, as shown in fig. 7.
The temperature and humidity circulating system, the heating and refrigerating system, the electric control system and the like of the temperature test device are not important points of the invention and are not expanded and described.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (7)
1. A walk-in temperature testing apparatus, the apparatus comprising at least:
the primary-secondary vehicle consists of a primary vehicle and a secondary vehicle;
the box body is internally provided with at least one first box chamber for accommodating a test sample, and one surface of the first box chamber can be opened and closed to allow the test sample to enter and exit; two layers of spraying are arranged in the box body, and four nozzles of each layer are arranged above the test sample; the upper layer spraying is arranged on the top wall of the first box chamber, and the lower layer spraying is arranged on a primary-secondary vehicle for bearing the test sample; the first box chamber is internally provided with a first shortcut interface, the sub-vehicle is provided with a spray pipeline and a second shortcut interface, and the second shortcut interface can be connected with the first shortcut interface so that the sub-vehicle can spray water;
the sensor is arranged in the box body and used for monitoring the temperature and the fire information of the test sample;
the three-level fire extinguishing system consists of a fire extinguisher fire extinguishing system, a spray fire extinguishing system and a submerged fire extinguishing system; the three-level fire extinguishing system can be opened and closed singly or in combination according to the fire information.
2. The walk-in temperature test apparatus according to claim 1, wherein the fire extinguishing pipes of the fire extinguisher fire extinguishing system are disposed on the left side, right side, rear side and top surface of the inner wall of the first chamber, and each of the inner walls is provided with at least two fire extinguishing agent outlets toward the test article.
3. The walk-in temperature testing apparatus according to claim 2, wherein the fire extinguishing pipes of the left side, right side and rear side of the inner wall are divided into upper and lower layers, each layer having at least two of the fire extinguishing agent outlets.
4. The walk-in temperature test device according to claim 1, wherein the immersed fire extinguishing system is immersed in fire water, the water pressure of the fire water ranges from 0.2MPa to 0.5MPa, and the flow rate of the fire water is more than or equal to 24m 3 /h。
5. The walk-in temperature test apparatus according to claim 1, wherein a pressure relief device is provided at the top of the case, and the pressure relief device has a protective structure.
6. The walk-in temperature testing device of claim 1, wherein the sensor comprises a barometric pressure sensor, a temperature sensor, a smoke sensor, a carbon monoxide concentration sensor, a hydrocarbon concentration sensor.
7. The walk-in temperature testing apparatus according to claim 6, wherein the temperature sensor collects a surface temperature of the test substance and a temperature in the case.
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| CN201810869344.4A CN108853837B (en) | 2018-08-02 | 2018-08-02 | Walk-in temperature test device |
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| CN201810869344.4A CN108853837B (en) | 2018-08-02 | 2018-08-02 | Walk-in temperature test device |
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| CN108853837B true CN108853837B (en) | 2023-07-07 |
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| CN109728216B (en) * | 2018-12-13 | 2022-04-01 | 宁波拜特测控技术股份有限公司 | Battery intelligence system of stewing |
| CN111330186A (en) * | 2018-12-18 | 2020-06-26 | 爱驰汽车（上海）有限公司 | Car lithium cell package extinguishing device and system |
| CN109939391A (en) * | 2019-04-02 | 2019-06-28 | 广东立佳实业有限公司 | A kind of buried fire fighting extinguisher of high-low temperature test chamber water logging and its method |
| CN112630663A (en) * | 2020-12-04 | 2021-04-09 | 广州五所环境仪器有限公司 | High-low temperature damp-heat test box with fire-fighting function and test method thereof |
| CN112415394A (en) * | 2020-12-04 | 2021-02-26 | 广州五所环境仪器有限公司 | High-low temperature damp-heat test box for lithium battery and test method thereof |
| CN218584849U (en) * | 2022-09-28 | 2023-03-07 | 宁德时代新能源科技股份有限公司 | Detection device |
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| CN107221246A (en) * | 2017-07-17 | 2017-09-29 | 深圳市佑安安全技术有限公司 | A kind of practical fire control system teaching demonstration device |
| CN107854799A (en) * | 2017-12-07 | 2018-03-30 | 公安部上海消防研究所 | A kind of more scene electric short circuit analogue experiment installations and method |
| CN208641590U (en) * | 2018-08-02 | 2019-03-26 | 上汽时代动力电池系统有限公司 | A kind of walk-in type temperature testing device |
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| CN108853837A (en) | 2018-11-23 |
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