Thermal management test tool capable of accurately adjusting forced convection heat transfer coefficient
By designing a thermal management test fixture that can precisely adjust the forced convection heat transfer coefficient, the problem of inaccurate control of the heat transfer coefficient on the outer surface of the battery pack was solved, enabling accurate testing and simulation of the battery pack's thermal performance, and improving the reliability of the test results and the service life of the fixture.
Patent Information
- Application Number
- CN202520091559.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2035-01-15
AI Technical Summary
Existing technologies cannot precisely adjust and control the forced convection heat transfer coefficient at various locations on the outer surface of the battery pack, resulting in poor repeatability of test results, inability to realistically simulate usage scenarios, and reduced credibility of test results.
A thermal management test fixture including a base assembly and a top cover assembly was designed. It is equipped with a side wind speed adjustment system and a wind control system. By independently controlling each subsystem, the forced convection heat transfer coefficient of each side of the battery pack can be precisely adjusted. Waterproof and perforated structures are set on the top plate and the base to prevent condensate from entering.
It achieves precise control of the forced convection heat transfer coefficient at various points in the battery pack, simulates the thermal performance under different environmental conditions, reduces the increase in local heat transfer intensity and the impact of condensate on insulation withstand voltage, extends the service life of the tooling, and reduces errors and costs.
Smart Images
Figure CN223623648U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of battery pack testing technology, specifically involving a thermal management test fixture that can precisely adjust the forced convection heat transfer coefficient. Background Technology
[0002] Currently, when conducting thermal management tests on battery packs, battery companies and testing institutions place the battery packs in an environmental chamber and circulate air at a specific temperature and humidity to simulate real-world usage scenarios. To prevent the air outlets in the test chamber from blowing directly onto the battery pack surface, a common solution is to cover the surface with a fixture, such as a cardboard box or waterproof tarpaulin. While this method prevents direct airflow onto the test object, the forced convection heat transfer coefficient at various locations on the battery pack's outer surface cannot be precisely adjusted and controlled according to actual usage scenarios. Therefore, it is difficult to accurately control the magnitude of the forced convection heat transfer coefficient at different locations on the battery pack's outer surface, making it difficult to guarantee the repeatability of the results and failing to truly simulate real-world usage scenarios, thus reducing the reliability of the test results. Utility Model Content
[0003] The purpose of this invention is to provide a thermal management test fixture that can precisely adjust the forced convection heat transfer coefficient, which can accurately and independently adjust the forced convection heat transfer coefficient of each side of the battery pack according to the actual use scenario of the battery pack, so as to accurately test the thermal performance test results of the battery pack.
[0004] To achieve the above objectives, this utility model provides a thermal management test fixture that can precisely adjust the forced convection heat transfer coefficient. It includes a base assembly and a top cover assembly. The top cover assembly is connected above the base assembly to form a test space. The top cover assembly includes a top plate and side plates connected to the periphery of the top plate. Several side wind speed adjustment systems are connected to the side plates. The top plate and the base assembly are respectively provided with wind control systems of the same structure.
[0005] The side wind speed adjustment system includes a through hole on the side plate, a manifold connected to the through hole facing the inner side of the side plate, a fan base connected inside the through hole, a side fan connected to the fan base, the side fan being located inside the manifold, a bracket connected to the end of the manifold away from the fan base, and a wind deflector connected to the end of the bracket away from the side fan via a support column.
[0006] The air control system includes several subsystems. The subsystems include a box, a small fan connected inside the box, an opening on the side of the box, and an air control pipe connected to the opening. The air control pipe has an air control hole facing the test space.
[0007] Support plates are connected to the top plate and the base assembly respectively, and ventilation strip holes are provided on the support plates corresponding to the air control pipes.
[0008] As a further embodiment of this utility model, the wind deflector is provided with evenly distributed air outlet holes.
[0009] As a further embodiment of this utility model: a waterproof structure with a shielding through-hole is provided on the outer side of the side plate.
[0010] As a further aspect of this utility model, the diameter of the air control hole gradually increases in the direction away from the square box.
[0011] As a further embodiment of this utility model, the bottom of the base assembly is provided with a hollow structure.
[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0013] Each side wind speed regulation system and subsystem is relatively independent. During the test, the forced convection heat transfer coefficient at various points on the outer surface of the battery pack can be modified in a targeted manner. Therefore, the thermal performance of the battery pack under different environmental conditions can be accurately simulated.
[0014] In addition, this fixture can prevent the air outlet of the environmental chamber from blowing directly onto the surface of the battery pack, which would cause a sharp increase in local heat exchange intensity. The waterproof structure can also prevent condensate from the top of the environmental chamber from entering the fixture from the side air speed regulation system and then falling onto the surface of the battery pack, which would reduce the insulation withstand voltage of the entire pack. This not only extends the service life of the fixture, but also reduces the error of thermal management tests.
[0015] The diameter of the air control holes on the air control pipes in each subsystem gradually increases in the direction away from the square box, which can make the airflow from the air control holes flow evenly to the surface of the battery pack.
[0016] The base assembly features a hollow structure at the bottom, which significantly reduces the overall weight of the tooling and lowers costs; it also takes into account the actual use of forklifts for handling, and provides space for it. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of the thermal management test fixture of this utility model, which can precisely adjust the forced convection heat transfer coefficient.
[0018] Figure 2 This is a schematic diagram of the internal structure of the thermal management test fixture of this utility model, which can precisely adjust the forced convection heat transfer coefficient.
[0019] Figure 3 yes Figure 2 Schematic diagram of the structure of section A.
[0020] Figure 4 This is a schematic diagram of the subsystem of the thermal management test fixture that can precisely adjust the forced convection heat transfer coefficient according to this utility model.
[0021] Figure 5This is a bottom view structural diagram of a subsystem of the thermal management test fixture that can precisely adjust the forced convection heat transfer coefficient according to this utility model.
[0022] In the diagram: 1. Base assembly, 2. Top cover assembly, 3. Waterproof structure, 4. Hollow structure, 5. Fixing component, 6. Subsystem, 7. Support plate, 8. Ventilation strip hole, 9. Through hole, 10. Fan base, 11. Side fan, 12. Combustion pipe, 13. Bracket, 14. Column, 15. Wind deflector, 16. Air outlet.
[0023] 2.1 Top slab; 2.2 Side slabs;
[0024] 6.1 Square box, 6.2 Opening, 6.3 Small fan, 6.4 Air control pipe, 6.5 Air control hole. Detailed Implementation
[0025] The present invention will be further described below with reference to the accompanying drawings.
[0026] like Figures 1 to 5 As shown, the thermal management test fixture that can precisely adjust the forced convection heat transfer coefficient includes a base assembly 1 and a top cover assembly 2. The top cover assembly 2 is connected above the base assembly 1 to form a test space. The base assembly 1 and the top cover assembly 2 are connected by a fastener 5. The fastener 5 can use matching bolts and nuts to ensure that the base assembly 1 and the top cover assembly 2 are tightly connected to prevent water droplets in the environmental chamber from entering the fixture. The top cover assembly 2 includes a top plate 2.1 and side plates 2.2 connected to the periphery of the top plate 2.1. Several side wind speed adjustment systems are connected to the side plates 2.2. The top plate 2.1 and the base assembly 1 are respectively provided with wind control systems of the same structure.
[0027] The side wind speed adjustment system includes a through hole 9 on the side plate 2.2. A manifold 12 is connected to the through hole 9 facing the inner side of the side plate 2.2. A fan base 10 is connected inside the through hole 9. A side fan 11 is connected to the fan base 10. The side fan 11 is located inside the manifold 12. A bracket 13 is connected to the end of the manifold 12 away from the fan base 10. A wind deflector 15 is connected to the end of the bracket 13 facing away from the side fan 11 through a support column 14.
[0028] The air control system includes several subsystems 6. Subsystem 6 includes a box 6.1. A small fan 6.3 is connected inside the box 6.1. An opening 6.2 is provided on the side of the box 6.1, and an air control pipe 6.4 is connected to the opening 6.2. An air control hole 6.5 is provided on the air control pipe 6.4 facing the test space.
[0029] Support plates 7 are connected to the top plate 2.1 and the base assembly 1 respectively. The support plates 7 are connected and fixed to the square box 6.1. Ventilation strip holes 8 are provided on the support plates 7 corresponding to the air control pipe 6.4.
[0030] like Figure 1 As shown, the side airflow regulation system has four sets on the side plate 2.2 along the length direction of the upper cover assembly 2 and two sets on the side plate 2.2 along the width direction. In actual use, it can be adjusted according to the battery pack size. Each subsystem 6 of the side airflow regulation system and the air control system is independently controlled, allowing for targeted correction of the forced convection heat transfer coefficient at various points on the outer surface of the battery pack during testing. Therefore, it can accurately simulate the thermal performance of the battery pack under different environmental conditions.
[0031] To more evenly control the airflow distribution of the side wind speed regulation system, further, such as Figure 3 As shown, the wind deflector 15 is provided with evenly distributed air outlet holes 16.
[0032] During the test, condensation will occur on the top of the environmental chamber. To prevent the falling condensation from entering the tooling, a waterproof structure 3 with a shielding through-hole 9 is further provided on the outer side of the side plate 2.2.
[0033] The airflow of subsystem 6 flows out through the air control holes 6.5. To further ensure more uniform airflow from each air control hole 6.5, further... Figure 5 As shown, the diameter of the air control hole 6.5 gradually increases in the direction away from the square box 6.1.
[0034] Furthermore, such as Figure 1 As shown, the bottom of the base assembly 1 has a hollow structure 4, which can reduce the overall weight of the tooling, reduce costs, and facilitate forklift handling.
[0035] When this utility model is used in a specific way:
[0036] 1) First, remove the fastener 5 between the top cover assembly 2 and the base assembly 1, and set the top cover assembly 2 aside;
[0037] 2) Use a forklift to place the battery pack stably on the upper surface of the support plate 7 connected to the base assembly 1;
[0038] 3) Place the top cover assembly 2 back on top of the base assembly 1 and secure it with the fastener 5;
[0039] 4) Use a forklift to move the tooling and battery pack as a whole into the environmental chamber;
[0040] 5) Adjust the wind speed regulation system and subsystem 6 on each side according to the specific usage scenario of the battery pack so that the forced convection heat transfer coefficient at each point on the surface of the battery pack meets the requirements, and start the test.
Claims
1. A thermal management test fixture with precisely adjustable forced convection heat transfer coefficient, comprising a base assembly (1) and a top cover assembly (2), wherein the top cover assembly (2) is connected above the base assembly (1) to form a test space, characterized in that, The top cover assembly (2) includes a top plate (2.1) and side plates (2.2) connected to the periphery of the top plate (2.1). Several side wind speed adjustment systems are connected to the side plates (2.2). The top plate (2.1) and the base assembly (1) are respectively provided with wind control systems of the same structure. The side wind speed adjustment system includes a through hole (9) on the side plate (2.2), a manifold (12) is connected to the inner side of the side plate (2.2) through hole (9), a fan base (10) is connected inside the through hole (9), a side fan (11) is connected to the fan base (10), the side fan (11) is located inside the manifold (12), a bracket (13) is connected to the end of the manifold (12) away from the fan base (10), and a wind deflector (15) is connected to the end of the bracket (13) away from the side fan (11) through a support column (14); The air control system includes several subsystems (6). Subsystem (6) includes a box (6.1), a small fan (6.3) is connected inside the box (6.1), an opening (6.2) is provided on the side of the box (6.1), and an air control pipe (6.4) is connected to the opening (6.2). An air control hole (6.5) is provided on the air control pipe (6.4) facing the test space. A support plate (7) is connected to the top plate (2.1) and the base assembly (1), and a ventilation strip hole (8) is provided on the support plate (7) corresponding to the air control pipe (6.4).
2. The thermal management test fixture with precisely adjustable forced convection heat transfer coefficient according to claim 1, characterized in that, The wind deflector (15) is provided with evenly distributed air outlet holes (16).
3. The thermal management test fixture with precisely adjustable forced convection heat transfer coefficient according to claim 1 or 2, characterized in that, The side panel (2.2) has a waterproof structure (3) with a shielding through hole (9) on the outside.
4. The thermal management test fixture with precisely adjustable forced convection heat transfer coefficient according to claim 1 or 2, characterized in that, The diameter of the air control hole (6.5) gradually increases in the direction away from the square box (6.1).
5. The thermal management test fixture with precisely adjustable forced convection heat transfer coefficient according to claim 4, characterized in that, The base assembly (1) has a hollow structure (4) at the bottom.