Test box for battery test based on air and water tank temperature control

Abstract

The utility model discloses a test device for a battery condensation test based on air and water tank temperature control. The test device comprises a test box body, a water tank and a placement rack, the water tank is provided with a water temperature adjusting assembly, and the box body is provided with a temperature and humidity adjusting part The water temperature adjusting assembly comprises a heating piece, a refrigerating piece, a first temperature collector and a water flow guiding unit used for guiding water in the water tank to flow. The refrigerating part comprises a first cooling pipe and a second cooling pipe, the first cooling pipe is arranged in the water tank, and a heat conducting surface is arranged between the second cooling pipe and the water inlet end of the circulating water pipe; the controller receives and responds to the water temperature signal to control the heating piece and the refrigerating piece to act; the temperature and humidity adjusting assembly comprises a humidifying spray head, a temperature adjusting part, a second temperature collector and a first humidity collector, and the controller receives and responds to an air temperature signal and a humidity signal to control the humidifier and the temperature adjusting part to act. And the reliability of test results is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power battery testing devices, and more specifically, to a test box for battery testing based on air and water tank temperature control. Background Art

[0002] The operating environment of a car is complex and changeable, and it often drives in scenes with high temperature and high humidity or dryness and low temperature. This requires the components on the car to be able to cope with and adapt to the above-mentioned changes in the operating environment.

[0003] With the continuous development and popularization of new energy vehicles, the safety of power batteries such as hydrogen fuel cells and lithium batteries has attracted more and more attention. The condensation test of automotive batteries is mainly to detect the impact of condensation inside and outside the power battery on the function of the battery module during the rapid change of environmental temperature and humidity. According to relevant standards, during the test process, the test piece must first be cooled to the set temperature using air conditioning equipment, and then the inside of the test box must be heated using a water tank. In this process, the relevant parameters of the test piece during use are collected. Finally, when the temperature inside the test box reaches the set value, the drying process is started to dry the box and the test piece, and then the cooling and heating operations are performed again. This cycle is repeated for a set number of times to complete the test.

[0004] From the above test process, we can see that the state of the environmental parameters of the test piece and the box at each test node is related to the accuracy of the entire test result. For example, the test standard requires that the temperature in the box be maintained at the initial value for 60 minutes using air conditioning equipment before heating the water tank. The main purpose is to allow the ambient temperature to penetrate the test piece. Obviously, the actual temperature inside the test piece has reached the initial setting value, which is only an estimate, not the actual test value. How to improve the accuracy of each test parameter of the test piece and the box at the test node is a problem that needs to be solved urgently, and it is also the key to improving the reliability of condensation test results. Utility Model Content

[0005] In view of the problem that the test parameters of power batteries and other automotive parts are not accurate enough during the condensation test in actual use, which affects the reliability of the test results, the purpose of this application is to propose a battery test chamber based on air and water tank temperature control: based on the current condensation test standard, further optimize the design of the details of the test device, so that the temperature and humidity parameters of the test box and the test piece at each node in the test process always meet the test standard requirements, and improve the reliability of the test results. The specific plan is as follows:

[0006] A test box for battery testing based on air and water tank temperature control, comprising a test box body and a controller, wherein a water tank is arranged at the bottom of the box body, and a placement rack for placing test pieces is arranged above the water tank; the water tank is connected to an external water tank through a circulating water pipe and is provided with a water temperature regulating component, and a temperature and humidity regulating component for regulating the temperature and humidity in the box body is also connected to the box body;

[0007] The water temperature regulating assembly includes a heating element, a cooling element, and a first temperature collector for detecting the water temperature in the water tank, wherein the heating element is configured as a first heating tube arranged in the water tank, and a water flow guide unit for guiding the flow of water in the water tank; the cooling element includes a first cooling tube and a second cooling tube connected to an external refrigeration device, wherein the first cooling tube is arranged in the water tank, and a heat conducting surface is formed between the second cooling tube and the water inlet end of the circulating water pipe to realize heat exchange; the first temperature collector is connected to the controller signal, collects the water temperature signal and outputs it to the controller, and the controller receives and controls the actions of the heating element and the cooling element in response to the water temperature signal;

[0008] The temperature and humidity adjustment component includes a humidifying nozzle connected to an external humidifier, a temperature adjustment component, a second temperature collector for detecting the temperature in the box, and a first humidity collector for detecting the humidity in the box; the second temperature collector and the first humidity collector are both connected to the controller signal to output air temperature signals and humidity signals, and the controller receives and responds to the air temperature signals and humidity signals to control the actions of the humidifier and the temperature adjustment component.

[0009] Through the above technical solution, the first heating tube can be used to heat the water in the water tank, and the water flow guide unit can be used to mix the water with different temperatures evenly during the heating process, so that the water temperature collected by the first temperature collector is more accurate, thereby ensuring that the test system collects the operating data of the test piece at the correct test node. By using the first cooling tube and the second cooling tube in combination, the water temperature can be quickly and accurately lowered to the initial temperature, ensuring that the water temperature can quickly return to the initial setting value after a test cycle ends, and will not affect the air temperature adjustment process in the next test process, thereby improving the reliability of the test results.

[0010] Furthermore, the water flow guiding unit includes a plurality of guide plates arranged in the water tank, at least one of the guide plates is arranged next to the first heating tube or the first cooling tube and has a set bending angle to guide the water flowing around the first heating tube / first cooling tube to other areas of the water tank.

[0011] During the heating or cooling process, the water in the water tank will flow due to changes in water density, and the above flow often occurs in the water space around the first heating tube / first cooling tube, and cannot keep the water temperature in the water tank balanced, that is, the temperature collected by the first temperature collector is not the average temperature or overall temperature of the water in the water tank, which may have a significant impact on the test results in severe cases. To this end, through the above technical solution, the setting of the guide plate can guide the high-temperature and low-density water around the first heating tube / first cooling tube to the area in the water tank where the fluid flows slowly, so that the temperature distribution in the water tank is more uniform, and the temperature collected by the first temperature collector is more accurate, which helps to improve the reliability of the test results of the specimen.

[0012] Furthermore, the water flow guiding unit includes at least one inner circulation pipe connected to the inner wall of the water tank, and a first circulation pump arranged on the inner circulation pipe;

[0013] The inner circulation pipe forms at least one set of water inlet and outlet on the inner wall of the water tank. The first circulation pump is connected to the controller for control and operates in response to the control signal of the controller.

[0014] Through the above technical solution, the temperature distribution of the water in the water tank can be made more uniform during the heating or cooling process, ensuring that the test nodes triggered by water temperature changes are started at a more accurate time, thereby improving the reliability of the test results of the specimen.

[0015] Furthermore, a lifting assembly for adjusting the height of the placement rack is provided in the box, and the lifting assembly includes a lifting rod fixedly connected to the edge of the placement rack, and a driving motor for driving the lifting rod to move up and down;

[0016] The lifting rod is slidably connected to a guide tube vertically penetrating the top of the box body, and the driving motor is connected to the lifting rod via a gear or a pull rope.

[0017] Through the above technical solution, the position of the placement rack in the box can be changed, so that test pieces of different sizes can be placed on the placement rack for testing. At the same time, due to changes in temperature in the box, the area where water vapor gathers will also change accordingly. The above solution can allow the test piece to always be in the best testing position in the box.

[0018] Furthermore, the lifting rods are configured in at least two groups and are disposed on both sides of the placement rack, and one end of the lifting rod connected to the placement rack is configured as a universal joint.

[0019] Through the above technical solution, by controlling the lifting of different lifting rods, the angle of the test piece when being tested in the box can be changed, thereby providing a more diverse test environment, making the test process more in line with the actual use scenario of the test piece, and improving the reliability of the test results.

[0020] Furthermore, the placement rack is detachably provided with a condensation cover for covering the test piece.

[0021] Through the above technical solution, it can be ensured that the humidity around the test piece is always maintained within the set range during the condensation test.

[0022] Furthermore, the temperature adjustment member includes an air duct connected to the air supply device, an electric heating wire, and a heat exchange tube connected to the external refrigeration device, the air duct forms a plurality of air inlets inside the box, and the box is provided with an exhaust port;

[0023] The air inlet is arranged close to the humidifying nozzle and faces the direction of the placement rack.

[0024] Through the above technical solution, the heating air or cooling air of the temperature regulating part can be more evenly dispersed into the box, avoiding the influence of local over-high or over-low temperature on the test results of the test piece. At the same time, the dry air or the water mist sprayed by the humidification nozzle is more evenly diffused into the box space by using the air duct outlet, thereby improving the detection accuracy of the first humidity collector.

[0025] Furthermore, the water tank opening is rectangular and horizontal slide rails are arranged on both sides of the opening, and a plurality of sliders are arranged in the slide rails for sliding movement. A flexible telescopic cover for covering the water tank opening is connected between the sliders on the two slide rails.

[0026] The side of the telescopic cover not connected to the slider is fixedly connected to the edge of the water tank, and the other side is a movable side and is connected to a winding motor via a traction rope;

[0027] The two slide rails are located at one end of the fixed side of the telescopic cover and are both connected to a rotating wheel. The traction rope is arranged in a closed loop, one end of which is tightly pressed against the rotating wheel, and the other end is tightly pressed against the winding wheel on the winding motor.

[0028] Through the above technical solution, during the step of drying or heating the box body with air, the water tank opening can be closed by using a winding wheel to prevent the water vapor evaporated from the water tank during the drying process from affecting the drying process. There is no need to repeatedly add or discharge the water in the water tank, thereby ensuring the smooth progress of the test process.

[0029] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0030] (1) By setting a water flow guide unit in the water tank, the water at different positions in the water tank can be mixed evenly, so that the water temperature collected by the first temperature collector is more accurate, thereby ensuring that the test system collects the operating data of the test piece at the correct test node;

[0031] (2) By setting and utilizing the first cooling pipe and the second cooling pipe in coordination, the water temperature can be quickly and accurately lowered to the initial temperature;

[0032] (3) By setting the placement frame as a deflectable structure, the placement angle of the specimen can be changed while ensuring the stability of the specimen, making the condensation test more suitable for the actual use scenario of the specimen. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is an overall schematic diagram of the utility model;

[0034] Figure 2 It is a schematic diagram of the assembly and coordination of the circulating water pipe and the second cooling pipe.

[0035] Figure numerals: 1. Box body; 2. Control cabinet; 3. Water tank; 4. Storage rack; 5. Circulating water pipe; 6. Solenoid switch valve; 7. Circulating water pump; 8. First heating tube; 9. First cooling tube; 10. Second cooling tube; 11. Guide plate; 12. First temperature collector; 13. Internal circulation tube; 14. First circulation pump; 15. Second temperature collector; 16. First humidity collector; 17. Lifting rod; 18. Drive motor; 19. Universal joint; 20. Condensation cover; 21. Air inlet; 22. Exhaust outlet; 23. Humidifier nozzle; 24. Flexible telescopic cover; 25. Slider; 26. External water tank. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation methods of the present invention are not limited thereto.

[0037] A battery test chamber based on air and water tank temperature control, such as Figure 1 As shown, the test box includes a test box body 1 and a power supply device and a control cabinet 2 arranged outside the box body 1. The control cabinet 2 is provided with a controller, and a PLC control module is preferably used.

[0038] A water tank 3 is provided at the bottom of the box 1, and a placement rack 4 for placing the test piece is provided above the water tank 3. The placement rack 4 is made of a hollow movable plate or directly adopts a stainless steel grid. The water tank 3 is connected to the external water tank 26 through a circulating water pipe 5. The circulating water pipe 5 is provided with an electromagnetic switch valve 6 and a circulating water pump 7 connected to the controller. A water temperature adjustment component is provided inside the water tank 3. At the same time, a temperature and humidity adjustment component for adjusting the temperature and humidity in the box 1 is also provided on the box 1.

[0039] In the embodiment of the present application, the water temperature regulating component includes a heating element, a cooling element, and a first temperature collector 12 for detecting the water temperature in the water tank 3. The heating element includes a first heating tube 8 arranged in the water tank 3. The first heating tube 8 is preferably an electric heating tube powered by an external power supply device and the heating power is controlled by a controller. The first heating tube 8 is arranged at the bottom of the water tank 3. The cooling element includes a first cooling tube 9 and a second cooling tube 10 connected to an external cooling device, such as a compression refrigeration device. The first cooling tube 9 is directly arranged on the side wall of the water tank 3, combined with Figure 2 As shown, a heat-conducting surface is formed between the second cooling pipe 10 and the water inlet end of the circulating water pipe 5 to achieve heat exchange. The second cooling pipe 10 and the circulating water pipe 5 are preferably matched in the form of a heat exchange coil.

[0040] Based on the above arrangement, the water in the water tank 3 can be continuously heated by the electric heating tube, and the temperature in the water tank 3 can be cooled by the cooling tube. In order to shorten the cooling time and more accurately control the temperature of the water in the water tank 3, the above refrigeration element is implemented by the first cooling tube 9 and the second cooling tube 10.

[0041] The first temperature collector 12 is connected to the controller signal, collects the water temperature signal and outputs it to the controller. The controller receives and controls the actions of the heating element and the refrigeration element in response to the water temperature signal.

[0042] At present, as the volume of the test piece continues to increase, the volume of the water tank 3 is also getting larger. Due to the low fluidity of the water in the water tank 3, the fixed first temperature collector 12 can often only reflect the water temperature of a specific position area in the water tank 3, while the water vapor generated by the water tank 3 in the condensation test and its impact on the temperature of the box 1 are related to the overall temperature of the water in the water tank 3. Therefore, in order to make the water temperature in the water tank 3 evenly distributed so that the test results are more accurate, the water tank 3 is also equipped with a water flow guide unit for guiding the flow of water in the water tank 3.

[0043] In one embodiment, the water flow guiding unit includes a plurality of guide plates 11 disposed in the water tank 3, at least one guide plate 11 is disposed next to the first heating tube 8 or the first cooling tube 9 and is bent at a set angle to guide the water flowing around the first heating tube 8 / first cooling tube 9 to other areas of the water tank 3. It should be noted that the guide plates 11 are disposed at the edge of the side wall of the water tank 3 and will not interfere with the immersion test that may be performed on the specimen. During the heating or cooling process, the water in the water tank 3 will flow inside due to changes in water density, and the flow often occurs in the water space around the first heating tube 8 / first cooling tube 9, and cannot keep the water temperature in the water tank 3 balanced, that is, the temperature collected by the first temperature collector 12 is not the average temperature or overall temperature of the water in the water tank 3. If the above situation is serious, it will affect the test results. The setting of the guide plate 11 in the above technical solution can guide the high-temperature and low-density water around the first heating tube 8 / first cooling tube 9 to the area where the fluid flows slowly in the water tank 3, so that the temperature distribution in the water tank 3 is more uniform, and the temperature collected by the first temperature collector 12 is more accurate, which helps to improve the reliability of the test results of the specimen.

[0044] In another embodiment, the water flow guide unit includes at least one inner circulation pipe 13 connected to the inner wall of the water tank 3 and a first circulation pump 14 arranged on the inner circulation pipe 13. The inner circulation pipe 13 forms at least one set of water inlet and outlet on the inner wall of the water tank 3, and the first circulation pump 14 is connected to the controller control, and receives and responds to the control signal of the controller to operate. During the test process, the first circulation pump 14 is used to make the water in the water tank 3 flow slowly, so that the temperature distribution of the water in the water tank 3 during heating or cooling can be more uniform, ensuring that the test node triggered by the change in water temperature is started at a more accurate time, and improving the reliability of the test results of the specimen.

[0045] In the embodiment of the present application, the temperature and humidity adjustment component includes a humidifying nozzle 23 connected to an external humidifier, a temperature adjustment member, a second temperature collector 15 for detecting the temperature in the box 1, and a first humidity collector 16 for detecting the humidity in the box 1.

[0046] The second temperature collector 15 and the first humidity collector 16 are both connected to the controller signal to collect and output air temperature signals and humidity signals. The controller receives and responds to the air temperature signals and humidity signals to control the actions of the humidifier and the temperature regulating element.

[0047] In order to allow specimens of different sizes to be placed on the rack 4 for testing, a lifting assembly for adjusting the height of the rack 4 is provided in the box 1, and the lifting assembly includes at least two sets of lifting rods 17 fixedly connected to the edge of the rack 4, and a driving motor 18 for driving the lifting rods 17 to move up and down. In the embodiment of the present application, three lifting rods can be configured, which are respectively located on both sides of the rack 4 and on the side away from the upper door of the box 1. The lifting rod 17 is slidably connected to the guide tube vertically penetrating the top of the box 1, and the driving motor 18 is connected to the lifting rod 17 via gears or pull ropes.

[0048] Optimally, a universal joint 19 is configured at one end of the lifting rod 17 connected to the placement rack 4. By controlling the lifting and lowering of different lifting rods 17 based on the above technical solution, the angle of the test piece when being tested in the box 1 can be changed, thereby providing a more diverse test environment, making the test process more in line with the actual use scenario of the test piece, and improving the reliability of the test results. At the same time, in order to ensure that the humidity around the test piece is always maintained in the set range during the condensation test, a condensation cover 20 for covering the test piece can be detachably provided on the placement rack 4.

[0049] During the test, the specimen needs to be placed in the box 1 for 60 minutes to keep the initial temperature inside the specimen consistent with that in the box 1. During this process, the temperature needs to be controlled by air. The temperature regulating component in this application includes an air duct connected to the air supply device, an electric heating wire, and a heat exchange tube connected to the external refrigeration device. The air duct forms a plurality of air inlets 21 inside the box 1, and an exhaust port 22 is provided on the box 1. The heating air or cooling air of the temperature regulating component can be more evenly dispersed into the box 1 to avoid the influence of excessively high or low local temperatures on the test results of the specimen.

[0050] Preferably, the air inlet 21 is arranged close to the humidifying nozzle 23 and toward the placement rack 4. When adjusting the humidity, the air duct outlet can be used to diffuse the dry air or the water mist sprayed by the humidifying nozzle 23 more evenly into the space of the box 1, thereby improving the detection accuracy of the first humidity collector 16.

[0051] In the drying stage, in order to avoid or reduce the effect of the evaporated water vapor from the water tank 3 on the drying process, the opening of the water tank 3 is set in a rectangular shape and horizontal slide rails are arranged on the edges of the opening on both sides. A plurality of sliders 25 are arranged to slide in the slide rails, and a flexible telescopic cover 24 for covering the opening of the water tank 3 is connected between the sliders 25 located on the two slide rails. The side of the telescopic cover that is not connected to the slider 25 is fixedly connected to the edge of the water tank 3, and the other side is a movable side and is connected to a winding motor via a traction rope. The two slide rails are both connected to a rotating wheel at one end of the fixed side of the telescopic cover, and the traction rope is arranged in a closed loop, one end of which is pressed against the rotating wheel, and the other end is pressed against the winding wheel on the winding motor.

[0052] The above is only the preferred implementation of the present application. The protection scope of the present application is not limited to the above embodiments. All technical solutions under the concept of the present application belong to the protection scope of the present application. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present application should also be regarded as the protection scope of the present application.

Claims

1. A test box for battery testing based on air and water tank temperature control, comprising a box body (1), a water tank (3) is arranged at the bottom of the box body (1), and a placement rack (4) for placing test pieces is arranged above the water tank (3); the water tank (3) is connected to an external water tank (26) and is provided with a water temperature adjustment component, and the box body (1) is also connected to a temperature and humidity adjustment component for adjusting the temperature and humidity in the box body (1); characterized in that The water temperature regulating component comprises a heating element, a cooling element and a first temperature collector (12) for detecting the water temperature in the water tank (3); the heating element is configured as a first heating tube (8) arranged in the water tank (3) and a water flow guide unit for guiding the flow of water in the water tank (3); the cooling element comprises a first cooling tube (9) and a second cooling tube (10) connected to an external cooling device; the first cooling tube (9) is arranged in the water tank (3); a heat conducting surface is formed between the water inlet end of the second cooling tube (10) and a circulating water tube (5) connected to the water tank to achieve heat exchange; the first temperature collector (12) is connected to a controller signal, collects a water temperature signal and outputs it to the controller; the controller receives and controls the operation of the heating element and the cooling element in response to the water temperature signal; The temperature and humidity adjustment component comprises a humidifying nozzle (23) connected to an external humidifier, a temperature adjustment component, a second temperature collector (15) for detecting the temperature in the box (1), and a first humidity collector (16) for detecting the humidity in the box (1); the second temperature collector (15) and the first humidity collector (16) are both connected to the controller signal to output an air temperature signal and a humidity signal; the controller receives and responds to the air temperature signal and the humidity signal to control the operation of the humidifier and the temperature adjustment component.

2. The battery testing test box based on air and water tank temperature control according to claim 1, characterized in that: The water flow guiding unit comprises a plurality of guide plates (11) arranged in the water tank (3), at least one of the guide plates (11) being arranged beside the first heating tube (8) or the first cooling tube (9) and having a set bending angle, so as to guide the water flowing around the first heating tube (8) / the first cooling tube (9) to other areas of the water tank (3).

3. The battery testing test box based on air and water tank temperature control according to claim 1, characterized in that: The water flow guiding unit comprises at least one inner circulation pipe (13) connected to the inner wall of the water tank (3), and a first circulation pump (14) arranged on the inner circulation pipe (13); The inner circulation pipe (13) forms at least one set of water inlet and outlet on the inner wall of the water tank (3); the first circulation pump (14) is connected to the controller for control and operates in response to control signals from the controller.

4. The battery testing test box based on air and water tank temperature control according to claim 1, characterized in that: A lifting assembly for adjusting the height of the placement rack (4) is arranged in the box body (1), and the lifting assembly comprises a lifting rod (17) fixedly connected to the edge of the placement rack (4), and a driving motor (18) for driving the lifting rod (17) to move up and down; The lifting rod (17) is slidably connected to a guide tube vertically penetrating the top of the box body (1), and the driving motor (18) is connected to the lifting rod (17) via a gear or a pull rope.

5. The battery testing test box based on air and water tank temperature control according to claim 4, characterized in that: The lifting rods (17) are configured in at least two groups and are disposed on both sides of the placement rack (4); one end of the lifting rod (17) connected to the placement rack (4) is configured as a universal joint (19).

6. The battery testing test box based on air and water tank temperature control according to claim 1, characterized in that: The temperature regulating element comprises an air duct connected to the air supply device, an electric heating wire and a heat exchange tube connected to the external refrigeration device, the air duct forms a plurality of air inlets (21) inside the box (1), and the box (1) is provided with an air outlet (22); The air inlet (21) is arranged close to the humidifying nozzle (23) and faces the direction of the placement rack (4).

7. The battery testing test box based on air and water tank temperature control according to claim 1, characterized in that: The placement rack (4) is detachably provided with a condensation cover (20) for covering the test piece.

8. The battery testing test box based on air and water tank temperature control according to claim 1, characterized in that: The water tank (3) has a rectangular opening and horizontal slide rails are arranged on both sides of the opening, and a plurality of sliders (25) are slidably arranged in the slide rails. A flexible telescopic cover (24) for covering the water tank (3) opening is connected between the sliders (25) on the two slide rails. The side of the telescopic cover that is not connected to the slider (25) is fixedly connected to the edge of the water tank (3), and the other side is a movable side and is connected to a winding motor via a traction rope; The two slide rails are located at one end of the fixed side of the telescopic cover and are both connected to a rotating wheel. The traction rope is arranged in a closed loop, one end of which is tightly pressed against the rotating wheel, and the other end is tightly pressed against the winding wheel on the winding motor.

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