A walk-in constant temperature and humidity test device and test method

Abstract

This invention discloses a walk-in constant temperature and humidity test device and method, specifically relating to the field of walk-in test chambers. The test device includes a test chamber with a door installed on the front. Support mechanisms are installed on both sides inside the test chamber. Each support mechanism includes a bracket with a guide rod vertically mounted on it. Several sliding seats are fitted onto the guide rods, and a rotating shaft is rotatably connected to one side of each sliding seat. A support plate is fixedly mounted on the rotating shaft. The support mechanism also includes a rotary drive component and a linear drive component. This invention ensures that when a battery pack catches fire, all battery packs fall to the bottom of the test chamber. This eliminates the space between the bottommost battery pack and the bottom of the test chamber, as well as the space between battery packs themselves, thus eliminating any unused space. In other words, when water is poured into the test chamber, it can directly contact the battery packs, shortening the time the battery packs are submerged and achieving the purpose of extinguishing the fire in a shorter time.

Description

Technical Field

[0001] This invention relates to the field of walk-in test chamber technology, and more specifically, to a walk-in constant temperature and humidity test device and test method. Background Technology

[0002] A walk-in constant temperature and humidity test chamber, also known as a walk-in constant temperature and humidity test chamber, is a device used to simulate extreme environmental conditions. It mainly consists of a heating system, a humidification system, a refrigeration system, and a ventilation system. It is suitable for low temperature, high temperature, high and low temperature change, constant temperature and heat, and high and low temperature alternating damp heat tests on whole machines or large components. It is widely used in military, aviation, electronics, automotive, chemical, medical and other fields.

[0003] The working environment of battery packs in new energy vehicles is relatively complex, with operating temperatures generally ranging from -30℃ to 60℃. Therefore, in order to ensure the safety of new energy battery packs during use, it is necessary to use a walk-in constant temperature and humidity test device to conduct constant temperature and humidity tests on the battery packs during the production design.

[0004] Currently, during testing, the battery pack is placed on the vehicle frame and then pushed into a walk-in temperature and humidity test chamber. However, fires are unavoidable during battery pack testing, and if the fire is large, extinguishing it is very difficult. Existing technology uses a water-flooding method to extinguish the fire; that is, when a fire occurs, water is quickly pumped into the test chamber to submerge the battery pack, thus extinguishing the fire.

[0005] However, because the battery packs were placed on the vehicle frame during the test, there was a height difference between the battery packs and the bottom of the test chamber, as well as a height difference between the upper and lower battery packs. When using flood extinguishing, water must completely fill the space between the bottommost battery pack and the bottom of the test chamber before it can reach the bottommost battery pack, and water must also fill the space between battery packs before it can reach the upper battery packs. These spaces are called ineffective spaces. Due to the large amount of ineffective space, flood extinguishing requires a longer water-filling time to achieve its purpose, during which time safety accidents are more likely to occur. Summary of the Invention

[0006] The present invention provides a walk-in constant temperature and humidity test device and test method, which aims to solve the problem that: when testing new energy battery packs, the existing walk-in constant temperature and humidity test devices have a large amount of ineffective space, which means that water needs to be poured for a long time to achieve the purpose of extinguishing the fire when flooding.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a walk-in constant temperature and humidity test device, comprising a test chamber, a door installed on the front side of the test chamber, and support mechanisms installed on both sides inside the test chamber. The support mechanism includes a bracket, a guide rod vertically installed on the bracket, and several sliding seats sleeved on the guide rod. A rotating shaft is rotatably connected to one side of the sliding seat, and a support plate is fixedly installed on the rotating shaft. The support mechanism also includes a rotary drive component and a linear drive component. The linear drive component is used to drive the sliding seat to move vertically, and the rotary drive component is used to drive the rotating shaft and the support plate to rotate. Each opposite support plate on the two support mechanisms can jointly support a battery pack.

[0008] The test chamber is equipped with a water inlet, which is connected to the water supply component. The test chamber is also equipped with a sensor to monitor whether there is a fire inside the test chamber. When a fire occurs inside the test chamber, the rotation drive component drives the support plate to rotate downwards, causing the battery pack to slide off the support plate to the bottom of the test chamber. At the same time, the water supply component fills the test chamber with water, submerging the battery pack.

[0009] In a preferred embodiment, the rotary drive component includes a worm gear and a worm, both of which are rotatably connected to the sliding seat and mesh with each other. A drive rod is vertically rotatably connected to the bracket, and the worm is slidably sleeved on the drive rod. A motor is mounted on the bracket and is used to drive the drive rod to rotate.

[0010] In a preferred embodiment, the linear drive component includes a lead screw vertically rotatably mounted on a bracket, wherein a sliding seat is threadedly connected to the lead screw, and a second motor is mounted on the bracket for driving the lead screw to rotate.

[0011] In a preferred embodiment, a long rod is rotatably connected to one side of all the sliding seats above the lowest sliding seat, and a lower short rod is hinged to the lowest sliding seat. The upper end of the lower short rod is hinged to the lower end of the long rod on the adjacent sliding seat. An upper short rod is hinged to the upper end of the bracket, and the lower end of the upper short rod is hinged to the upper end of the long rod on the adjacent sliding seat.

[0012] In a preferred embodiment, a water-blocking mechanism is provided inside the test chamber near the door. The water-blocking mechanism includes a water-blocking plate that is vertically slidably installed inside the test chamber. A limit block is fixedly connected to the end of the water-blocking plate. A fixing block is fixedly connected to the side wall of the test chamber. A swing rod is rotatably connected to the fixing block through an elastic component. A swing arm is fixedly connected to the upper end of the swing rod. A limit shaft is fixedly connected to the end of the swing arm. The limit shaft is supported at the bottom of the limit block. A cam is fixedly connected to the end of the lowest rotating shaft. When the support plate rotates downward, the cam pushes the bottom of the swing rod to disengage the limit shaft from the limit block, thereby causing the water-blocking plate to fall.

[0013] In a preferred embodiment, an extension plate is vertically slidably disposed inside the baffle plate, and a protrusion is fixedly connected to one side of the upper end of the extension plate. A support block is fixedly connected to the inner side wall of the test chamber. After the baffle plate is lowered, the support block is used to support the protrusion.

[0014] In a preferred embodiment, a control box is provided on one side of the test chamber, and an environmental control unit is provided inside the control box. The environmental control unit includes a heating system, a humidification system, a cooling system, and a ventilation system. The heating system, humidification system, and cooling system are connected to the interior of the test chamber through the ventilation system, thereby regulating the temperature and humidity inside the test chamber.

[0015] In a preferred embodiment, the walk-in constant temperature and humidity test device further includes an air duct switching mechanism, which includes an air duct 1 and an air duct 2. One side of the air duct 1 has an air outlet 1, and one side of the air duct 2 has an air outlet 2. A switching pipe 1 is movably inserted into the interior of the air duct 1. A protruding post is fixedly connected to the end of the switching pipe 1 near the air duct 2. The protruding post has air holes around its perimeter. A switching pipe 2 is movably inserted into the interior of the air duct 2. The end of the switching pipe 2 near the air duct 1 has a through-hole. The end of the air duct 1 away from the air duct 2 is connected to the interior of the test chamber. The end of the air duct 2 away from the air duct 1 is connected to the interior of the test chamber through a ventilation system.

[0016] In a preferred embodiment, the duct switching mechanism further includes a switching component, which includes a drive shaft. The drive shaft is fixedly connected to the upper end of the upper short rod. One end of the drive shaft is connected to a spur gear via a bevel gear set. The upper and lower sides of the spur gear are respectively meshed with rack one and rack two. Rack one and rack two are fixedly connected to switching pipe two and switching pipe one, respectively.

[0017] The present invention also provides a test method for a walk-in constant temperature and humidity test device, which, using the above-mentioned walk-in constant temperature and humidity test device, is characterized by comprising the following steps:

[0018] Step 1: During the test, open the door, place the battery pack on the support plate, and then close the door to conduct the test;

[0019] Step 2: When the sensor detects that the battery pack inside the test chamber is on fire, the rotary drive component drives the support plate to rotate downwards, causing the battery pack to slide off the support plate to the bottom of the test chamber.

[0020] Step 3: The water supply unit fills the test chamber with water to submerge the battery pack and extinguish the fire.

[0021] The technical effects and advantages of this invention are as follows: When a battery pack catches fire, this invention causes all battery packs to fall to the bottom of the test chamber, thereby eliminating the space between the bottom battery pack and the bottom of the test chamber, as well as the space between the battery packs themselves. This eliminates any unused space, meaning that when water is poured into the test chamber, it can directly contact the battery packs, shortening the time the battery packs are submerged and achieving the purpose of extinguishing the fire in a shorter time. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the internal structure of the present invention.

[0024] Figure 3 This is a schematic diagram of the structure of the battery pack supported by the two support mechanisms of the present invention.

[0025] Figure 4 This is a schematic diagram of the support mechanism of the present invention. Figure 1 .

[0026] Figure 5 This is a schematic diagram of the support mechanism of the present invention. Figure 2 .

[0027] Figure 6 This is a cross-sectional view of the support mechanism of the present invention.

[0028] Figure 7 Schematic diagram of the installation of the water-blocking mechanism of the present invention Figure 1 .

[0029] Figure 8 Schematic diagram of the installation of the water-blocking mechanism of the present invention Figure 2 .

[0030] Figure 9 This is a schematic diagram of the installation of the air duct switching mechanism of the present invention.

[0031] Figure 10 This is a schematic diagram of the air duct switching mechanism of the present invention.

[0032] Figure 11 This is a flowchart of the experimental method of the present invention.

[0033] The attached figures are labeled as follows: 1. Test chamber; 11. Chamber door; 2. Support mechanism; 21. Bracket; 22. Guide rod; 23. Sliding seat; 24. Rotating shaft; 25. Support plate; 26. Rotary drive component; 261. Worm gear; 262. Worm; 263. Drive rod; 264. Motor 1; 27. Linear drive component; 271. Lead screw; 272. Motor 2; 273. Long rod; 274. Upper short rod; 275. Lower short rod; 3. Water blocking mechanism; 31. Water blocking plate; 311. Limiting block; 32. Fixing block; 3 3. Swing rod; 34. Swing arm; 35. Limiting shaft; 36. Cam; 37. Extension plate; 371. Protrusion; 38. Support block; 4. Air duct switching mechanism; 41. Air duct one; 411. Air outlet one; 42. Air duct two; 421. Air outlet two; 43. Switching pipe one; 431. Protruding column; 432. Air hole; 44. Switching pipe two; 441. Through port; 45. Switching component; 451. Drive shaft; 452. Bevel gear set; 453. Spur gear; 454. Rack one; 455. Rack two; 5. Battery pack. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Refer to the instruction manual appendix Figures 1-10 A walk-in constant temperature and humidity test device includes a test chamber 1. A door 11 is installed on the front of the test chamber 1. Support mechanisms 2 are installed on both sides inside the test chamber 1. Each support mechanism 2 includes a bracket 21, with a guide rod 22 vertically mounted on the bracket 21. Several sliding seats 23 are sleeved on the guide rod 22. A rotating shaft 24 is rotatably connected to one side of each sliding seat 23. A support plate 25 is fixedly mounted on the rotating shaft 24. The support mechanism 2 also includes a rotary drive component 26 and a linear drive component 27. The linear drive component 27 drives the sliding seats 23 to move vertically. The rotary drive component 26 is used to drive the rotating shaft 24 and the support plate 25 to rotate. Each of the two support mechanisms 2 and each opposite support plate 25 can jointly support a battery pack 5. The test chamber 1 is provided with a water inlet, which is connected to the water supply component. A sensor is also installed in the test chamber 1 to monitor whether there is a fire in the test chamber 1. When there is a fire in the test chamber 1, the rotary drive component 26 drives the support plate 25 to rotate downward, so that the battery pack 5 slides off the support plate 25 to the bottom of the test chamber 1, and the water supply component pours water into the test chamber 1 to submerge the battery pack 5.

[0036] In the above technical solutions, such as Figures 4-6As shown, the rotary drive component 26 includes a worm gear 261 and a worm 262. Both the worm gear 261 and the worm 262 are rotatably connected to the sliding seat 23, and the worm gear 261 and the worm 262 mesh with each other. A drive rod 263 is vertically rotatably connected to the bracket 21. The worm 262 is slidably sleeved on the drive rod 263. A motor 264 is mounted on the bracket 21. The motor 264 is used to drive the drive rod 263 to rotate.

[0037] It should be noted that motor 264 drives drive rod 263 to rotate, drive rod 263 drives worm 262 to rotate, worm 262 drives worm wheel 261 to rotate, and worm wheel 261 can drive shaft 24 and support plate 25 to rotate.

[0038] In the above technical solutions, such as Figures 4-6 As shown, the linear drive component 27 includes a lead screw 271 that is vertically rotatably mounted on a bracket 21, a sliding seat 23 that is threadedly connected to the lead screw 271, and a motor 272 that is mounted on the bracket 21 to drive the lead screw 271 to rotate.

[0039] Furthermore, a long rod 273 is rotatably connected to one side of all the sliding seats 23 above the lowest sliding seat 23. A lower short rod 275 is hinged to the lowest sliding seat 23. The upper end of the lower short rod 275 is hinged to the lower end of the long rod 273 on the adjacent sliding seat 23. An upper short rod 274 is hinged to the upper end of the bracket 21. The lower end of the upper short rod 274 is hinged to the upper end of the long rod 273 on the adjacent sliding seat 23.

[0040] It should be noted that motor 272 drives lead screw 271 to rotate, and lead screw 271 drives the sliding seat 23 connected to it to move. For example, it drives the lowermost sliding seat 23 to move downward. At this time, through the lower short rod 275, long rod 273 and upper short rod 274, all sliding seats 23 can be moved downward. During the movement, the distance between adjacent sliding seats 23 will increase.

[0041] In the above technical solution, the water supply component uses a water pump, which pumps water from the water storage tank into the interior of the test chamber 1. The sensor can be a smoke sensor, which determines that the battery pack 5 is on fire when smoke is detected, or a temperature sensor, which determines that the battery pack 5 is on fire when a high temperature is detected.

[0042] In this embodiment, the specific implementation method is as follows: During the test, the box door 11 is opened, such as... Figure 2 and Figure 3As shown, the battery pack 5 is placed on the support plate 25, and then the chamber door 11 is closed for testing. During the test, when the sensor detects that the battery pack 5 inside the test chamber 1 is on fire, the linear drive component 27 first moves the sliding seat 23 downward, and the rotating shaft 24 and the support plate 25 follow suit, causing the battery pack 5 placed on the support plate 25 to also move downward. At the same time, the distance between adjacent sliding seats 23 also increases. Then, the rotation drive component 26 drives the support plate 25 to swing downward, causing the battery pack 5 to detach from the support plate 25 and fall to the bottom of the test chamber 1. Simultaneously, the water supply component fills the test chamber 1 with water, submerging the battery pack 5 to extinguish the fire.

[0043] In the above technical solution, the support mechanism 2 can support multiple battery packs 5 for testing. When a battery pack 5 catches fire, the rotation drive component 26 can drive the support plate 25 to swing downwards, causing the battery pack 5 to fall to the bottom of the test chamber 1. Simultaneously, the linear drive component 27 can drive the sliding seat 23 downwards, increasing the distance between adjacent sliding seats 23. This aims to bring the battery pack 5 closer to the bottom of the test chamber 1, reducing the impact when the battery pack 5 falls. It also prevents the support plate 25 from hitting the lower battery pack 5 and becoming stuck when swinging downwards. By ensuring that all battery packs 5 fall to the bottom of the test chamber 1 when they catch fire, the space between the lowest battery pack 5 and the bottom of the test chamber 1, as well as the space between battery packs 5 themselves, disappears, eliminating any unused space. This means that when water is poured into the test chamber 1, it can directly contact the battery pack 5, shortening the time the battery pack 5 is submerged and achieving the purpose of extinguishing the fire in a shorter time.

[0044] Refer to the instruction manual appendix Figure 2 , Figures 7-8 Inside the test chamber 1, near the door 11, there is a water-blocking mechanism 3. The water-blocking mechanism 3 includes a water-blocking plate 31 that is vertically slidably installed inside the test chamber 1. A limit block 311 is fixedly connected to the end of the water-blocking plate 31. A fixing block 32 is fixedly connected to the side wall of the test chamber 1. A swing rod 33 is rotatably connected to the fixing block 32 through an elastic component. A swing arm 34 is fixedly connected to the upper end of the swing rod 33. A limit shaft 35 is fixedly connected to the end of the swing arm 34. The limit shaft 35 is supported at the bottom of the limit block 311. A cam 36 is fixedly connected to the end of the rotating shaft 24 located at the bottom. When the support plate 25 rotates downward, the cam 36 pushes the bottom of the swing rod 33 to disengage the limit shaft 35 from the limit block 311, thereby causing the water-blocking plate 31 to fall.

[0045] It should be noted that, under normal conditions, the end of the limiting shaft 35 is supported on the lower side of the limiting block 311, keeping the water baffle 31 at the top of the test chamber 1 near the door 11. When the rotating shaft 24 and the support plate 25 rotate, causing the battery pack 5 to fall, the rotating shaft 24 will drive the cam 36 to rotate, causing the cam 36 to push the bottom of the swing arm 33, causing the swing arm 33 to swing. The swing arm 33 drives the swing arm 34 and the limiting shaft 35 to swing downward, causing the end of the limiting shaft 35 to disengage from the end of the limiting block 311. Thus, the water baffle 31 loses the support of the limiting shaft 35 and falls due to gravity, blocking the position of the door 11. The purpose is to ensure that after the water flooding fire is extinguished, when the door 11 is opened, the water baffle 31 can block the water inside the test chamber 1, preventing water from rushing out quickly from the opened door 11. The elastic component is a torsion spring, used to swing the swing arm 33 so that the swing arm 34 swings upward to return to its original position.

[0046] It should be noted that since the battery pack 5 produces many large and small parts and impurities after combustion, it is not advisable to directly pump them out with a water pump. It is better to handle them after opening the box door 11.

[0047] Furthermore, an extension plate 37 is vertically slidably arranged inside the baffle plate 31, and a protrusion 371 is fixedly connected to one side of the upper end of the extension plate 37. A support block 38 is fixedly connected to the inner side wall of the test chamber 1. After the baffle plate 31 is lowered, the support block 38 is used to support the protrusion 371.

[0048] It should be noted that when the baffle plate 31 falls downwards, the extension plate 37 also falls downwards. When the baffle plate 31 has not yet contacted the bottom of the test chamber 1, the protrusion 371 first contacts the support block 38. The support block 38 restricts the position of the protrusion 371, preventing the extension plate 37 from falling further, while the baffle plate 31 can continue to fall. At this time, the extension plate 37 extends out from the baffle plate 31. After the baffle plate 31 falls to the bottom of the test chamber 1, the baffle plate 31 and the extension plate 37 work together to block water. The extension plate 37 can increase the height of the water blockage.

[0049] Refer to the instruction manual appendix Figure 1 A control box is installed on one side of the test chamber 1. The control box contains an environmental control unit, which includes a heating system, a humidification system, a refrigeration system, and a ventilation system. The heating system, humidification system, and refrigeration system are connected to the interior of the test chamber 1 through the ventilation system, thereby regulating the temperature and humidity inside the test chamber 1.

[0050] Furthermore, the walk-in constant temperature and humidity test device also includes a duct switching mechanism 4. The duct switching mechanism 4 includes a first duct 41 and a second duct 42. One side of the first duct 41 has an air outlet 411, and one side of the second duct 42 has an air outlet 421. A switching pipe 43 is movably inserted into the inside of the first duct 41. A protruding post 431 is fixedly connected to the end of the switching pipe 43 near the second duct 42. The protruding post 431 has air holes 432 around its perimeter. A switching pipe 44 is movably inserted into the inside of the second duct 42. The end of the switching pipe 44 near the first duct 41 has a through-hole 441. The end of the first duct 41 away from the second duct 42 is connected to the inside of the test chamber 1. The end of the second duct 42 away from the first duct 41 is connected to the inside of the test chamber 1 through a ventilation system.

[0051] Furthermore, the air duct switching mechanism 4 also includes a switching component 45, which includes a drive shaft 451. The drive shaft 451 is fixedly connected to the upper end of the upper short rod 274. One end of the drive shaft 451 is connected to a spur gear 453 via a bevel gear set 452. The upper and lower sides of the spur gear 453 are respectively meshed with rack one 454 and rack two 455. Rack one 454 and rack two 455 are fixedly connected to switching pipe two 44 and switching pipe one 43 respectively.

[0052] In the above technical solution, the bevel gear set 452 consists of two bevel gears, one of which is mounted on the transmission shaft 451, and the other bevel gear is connected to the spur gear 453 via a shaft drive.

[0053] It should be noted that the environmental control unit controls the test environment inside the test chamber 1 through the heating system, humidification system, refrigeration system, and ventilation system. Specifically, the heating system, humidification system, and refrigeration system are used to heat, humidify, and cool the air, respectively, while the ventilation system sends the air with the required temperature and humidity into the interior of the test chamber 1 to form a circulation.

[0054] like Figure 10As shown, this is the state before the fire starts. In this state, duct 1 41 is connected to duct 2 42 through switching pipe 1 43, air hole 432, opening 441, and switching pipe 2 44. Switching pipe 1 43 closes air hole 1 411, and switching pipe 2 44 closes air hole 2 421. The ventilation system sends air from test chamber 1, duct 1 41, switching pipe 1 43, switching pipe 2 44, and duct 2 42 back into the interior of test chamber 1, forming a circulation. When a fire occurs, the sliding seat 23 needs to move downwards, causing the upper short rod 274 to swing. The upper end of the upper short rod 274 drives the transmission shaft 451 to rotate. The transmission shaft 451 drives the spur gear 453 to rotate via the bevel gear set 452. The spur gear 453 drives rack one 454 and rack two 455 to move. Rack one 454 and rack two 455 respectively drive switching pipe two 44 and switching pipe one 43 to move closer to each other, causing the protrusion 431 to insert into the opening 441, thereby closing switching pipe one 43 and switching pipe two 44. Switching pipe one 43 then opens air vent one 411, and switching pipe two 44 then opens air vent two 421. In this way, external air can enter the interior of the test chamber 1 through the ventilation system of air vent two 421 and air duct two 42, while the air inside the test chamber 1 is discharged through air duct one 41 and air vent one 411. The purpose is to ventilate and reduce the pressure inside the test chamber 1 caused by the temperature rise.

[0055] Refer to the instruction manual appendix Figure 11 This embodiment also provides a test method for a walk-in constant temperature and humidity test device. Using the above-mentioned walk-in constant temperature and humidity test device, the method includes the following steps:

[0056] Step 1: During the test, open the door 11, place the battery pack 5 on the support plate 25, and then close the door 11 to conduct the test;

[0057] Step 2: When the sensor detects that the battery pack 5 inside the test chamber 1 is on fire, the rotation drive component 26 drives the support plate 25 to rotate downward, so that the battery pack 5 slides off the support plate 25 to the bottom of the test chamber 1.

[0058] Step 3: The water supply unit fills the test chamber 1 with water to submerge the battery pack 5 and extinguish the fire.

[0059] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A walk-in constant temperature and humidity test device, characterized in that: The test chamber (1) is equipped with a door (11) on the front side. Support mechanisms (2) are installed on both sides inside the test chamber (1). The support mechanism (2) includes a bracket (21). A guide rod (22) is vertically installed on the bracket (21). Several sliding seats (23) are sleeved on the guide rod (22). A rotating shaft (24) is rotatably connected to one side of the sliding seat (23). A support plate (25) is fixedly installed on the rotating shaft (24). The support mechanism (2) also includes a rotary drive component (26) and a linear drive component (27). The linear drive component (27) is used to drive the sliding seat (23) to move vertically. The rotary drive component (26) is used to drive the rotating shaft (24) and the support plate (25) to rotate. Each opposite support plate (25) on the two support mechanisms (2) can jointly support a battery pack (5). The test chamber (1) is provided with a water inlet, which is connected to the water supply component. The test chamber (1) is also equipped with a sensor, which is used to monitor whether there is a fire in the test chamber (1). When there is a fire in the test chamber (1), the rotation drive component (26) drives the support plate (25) to rotate downward, so that the battery pack (5) slides off the support plate (25) to the bottom of the test chamber (1), and the water supply component pours water into the test chamber (1) so that the water submerges the battery pack (5). All the sliding seats (23) above the bottommost sliding seat (23) are rotatably connected to one side of a long rod (273). The bottommost sliding seat (23) is hinged to a lower short rod (275). The upper end of the lower short rod (275) is hinged to the lower end of the long rod (273) on the adjacent sliding seat (23). The upper end of the bracket (21) is hinged to an upper short rod (274). The lower end of the upper short rod (274) is hinged to the upper end of the long rod (273) on the adjacent sliding seat (23). By using the lower short rod (275), the long rod (273), and the upper short rod (274), all the sliding seats (23) can be moved downwards, and during the movement, the distance between adjacent sliding seats (23) will increase.

2. The walk-in constant temperature and humidity test device according to claim 1, characterized in that: The rotary drive component (26) includes a worm gear (261) and a worm (262). Both the worm gear (261) and the worm (262) are rotatably connected to the sliding seat (23), and the worm gear (261) and the worm (262) mesh with each other. A drive rod (263) is vertically rotatably connected to the bracket (21). The worm (262) is slidably sleeved on the drive rod (263). A motor (264) is installed on the bracket (21). The motor (264) is used to drive the drive rod (263) to rotate.

3. The walk-in constant temperature and humidity test device according to claim 2, characterized in that: The linear drive component (27) includes a lead screw (271) that is vertically rotatably mounted on a bracket (21), wherein a sliding seat (23) is threadedly connected to the lead screw (271), and a second motor (272) is mounted on the bracket (21) for driving the lead screw (271) to rotate.

4. The walk-in constant temperature and humidity test device according to claim 1, characterized in that: A water-blocking mechanism (3) is provided on the side of the test chamber (1) near the door (11). The water-blocking mechanism (3) includes a water-blocking plate (31) that is vertically slidably installed inside the test chamber (1). A limiting block (311) is fixedly connected to the end of the water-blocking plate (31). A fixing block (32) is fixedly connected to the side wall of the test chamber (1). A swing rod (33) is rotatably connected to the fixing block (32) through an elastic component. A swing arm (34) is fixedly connected to the upper end of the swing rod (33). A limiting shaft (35) is fixedly connected to the end of the swing arm (34). The limiting shaft (35) is supported at the bottom of the limiting block (311). A cam (36) is fixedly connected to the end of the rotating shaft (24) at the bottommost position. When the support plate (25) rotates downward, the cam (36) pushes the bottom of the swing rod (33) to disengage the limiting shaft (35) from the limiting block (311), thereby causing the water-blocking plate (31) to fall.

5. The walk-in constant temperature and humidity test device according to claim 4, characterized in that: An extension plate (37) is vertically slidably arranged inside the baffle plate (31). A protrusion (371) is fixedly connected to one side of the upper end of the extension plate (37). A support block (38) is fixedly connected to the inner side wall of the test chamber (1). After the baffle plate (31) is lowered, the support block (38) is used to support the protrusion (371).

6. The walk-in constant temperature and humidity test device according to claim 1, characterized in that: A control box is provided on one side of the test chamber (1). An environmental control unit is provided inside the control box. The environmental control unit includes a heating system, a humidification system, a refrigeration system, and a ventilation system. The heating system, humidification system, and refrigeration system are connected to the interior of the test chamber (1) through the ventilation system, thereby adjusting the temperature and humidity inside the test chamber (1).

7. The walk-in constant temperature and humidity test device according to claim 1, characterized in that: The walk-in constant temperature and humidity test device also includes a duct switching mechanism (4), which includes a first duct (41) and a second duct (42). One side of the first duct (41) has an air outlet (411), and one side of the second duct (42) has an air outlet (421). A switching pipe (43) is movably inserted into the inside of the first duct (41), and a protruding post (43) is fixedly connected to one end of the switching pipe (43) near the second duct (42). 1) The convex column (431) has air holes (432) around its perimeter. A switching pipe (44) is movably inserted into the interior of the second air duct (42). The end of the switching pipe (44) near the first air duct (41) has an opening (441). The end of the first air duct (41) away from the second air duct (42) is connected to the interior of the test chamber (1). The end of the second air duct (42) away from the first air duct (41) is connected to the interior of the test chamber (1) through a ventilation system.

8. The walk-in constant temperature and humidity test device according to claim 7, characterized in that: The air duct switching mechanism (4) further includes a switching component (45), which includes a drive shaft (451). The drive shaft (451) is fixedly connected to the upper end of the upper short rod (274). One end of the drive shaft (451) is connected to a spur gear (453) via a bevel gear set (452). The upper and lower sides of the spur gear (453) are respectively meshed with rack one (454) and rack two (455). The rack one (454) and rack two (455) are respectively fixedly connected to switching pipe two (44) and switching pipe one (43).

9. A test method for a walk-in constant temperature and humidity test apparatus, using a walk-in constant temperature and humidity test apparatus as described in any one of claims 1-8, comprising the following steps: Step 1: During the test, open the box door (11), place the battery pack (5) on the support plate (25), and then close the box door (11) to conduct the test; Step 2: When the sensor detects that the battery pack (5) inside the test chamber (1) is on fire, the rotation drive component (26) drives the support plate (25) to rotate downward, so that the battery pack (5) slides off the support plate (25) to the bottom of the test chamber (1); Step 3: The water supply component fills the test chamber (1) with water to submerge the battery pack (5) for fire extinguishing.

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