A testing device and method for a heat management system of a battery swapping station

Abstract

The present invention provides a heat management system and method for a battery swapping station. The heat management system for the battery swapping station includes a heat exchange circuit in which a heat exchange medium flows. The heat exchange circuit includes at least one branch, and each branch includes: a water inlet pipe and a water outlet pipe; an inner diameter variable-diameter pipe, the two ends of which are respectively communicated with the water inlet pipe and the water outlet pipe, and the variable-diameter inner diameter of the inner diameter variable-diameter pipe is set such that the error between the water resistance performance of the heat exchange medium in the inner diameter variable-diameter pipe and the water resistance performance of the simulated battery pack itself is within a preset range; a heating part, which is wrapped outside the inner diameter variable-diameter pipe and is controlled to generate heat to simulate the heat generation amount of the battery pack itself, so as to be able to at least test the flow rate of this branch. The present invention can simulate the working characteristics of the water-cooling pipeline inside the battery pack without using a real battery pack. In addition, since this alternative solution is used, there is no need to transport the real battery pack, which is convenient for transportation.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a test device and method for a heat management system of a battery swapping station. Background Art

[0002] In recent years, with the gradual increase in the penetration rate of electric vehicles, the energy replenishment method of battery swapping has gradually gained market recognition. The number of battery swapping stations laid has also gradually increased. A large number of batteries need to be stored in a battery swapping station, and a battery is a temperature-sensitive component. Therefore, all battery swapping stations use liquid cooling for battery temperature management, and thus a set of battery heat management systems needs to be designed in the battery swapping station. When designing, it is necessary to test the flow rate, refrigerating capacity, etc. of the system. The inventor found that the current test scheme is that a fully loaded battery pack must be provided (for example, if the heat management system of the battery swapping station has 12 branches, 12 battery packs are required for testing) to be connected to the system for testing. Due to the gradual increase in the usage frequency of the battery swapping station, the required number of battery packs is also increasing. The inventor believes that since the cost of a battery pack is very high, currently a pack is about 50,000 yuan (with a capacity of 50 KWh), and the actual number of battery packs needs to be used during testing. Therefore, the current test scheme has a high cost, and the battery pack is relatively heavy, about 300 kg, which is very inconvenient for handling during testing. Summary of the Invention

[0003] An object of the present invention is to provide a test device for a heat management system of a battery swapping station that can simulate the water resistance in a cooling pipe without a battery.

[0004] A further object of the present invention is to make the bubble situation in the simulated cooling pipe visible.

[0005] Specifically, the present invention provides a heat management system for a battery swapping station, including a heat exchange circuit in which a heat exchange medium flows. The heat exchange circuit includes at least one branch, and each branch includes:

[0006] An inlet pipe and an outlet pipe;

[0007] An inner diameter variable-diameter pipe, with both ends respectively communicating with the inlet pipe and the outlet pipe. The variable-diameter inner diameter of the inner diameter variable-diameter pipe is set such that the error between the water resistance performance of the heat exchange medium in the inner diameter variable-diameter pipe and the water resistance performance of the simulated battery pack itself is within a preset range;

[0008] A heating part, wrapped outside the inner diameter variable-diameter pipe, and controlled to generate heat to simulate the heat generation amount of the battery pack itself, so as to be able to at least test the flow rate of this branch.

[0009] Furthermore, the inner diameter variable-diameter pipe is provided to be transparent for observing the bubbles in the water flow of the heated pipe.

[0010] Further, the inner diameter variable-diameter pipe includes multiple sections with different inner diameters.

[0011] Further, the inner diameter variable-diameter pipe includes three sections with different inner diameters, and the inner diameter of the middle pipe section of the inner diameter variable-diameter pipe is smaller than that of the pipe sections at both ends.

[0012] Further, it is characterized in that the inner diameter variable-diameter pipe includes three sections with different inner diameters, and the inner diameter of the middle pipe section of the inner diameter variable-diameter pipe is smaller than that of the pipe sections at both ends.

[0013] Further, it is characterized in that the inner diameter variable-diameter pipe includes three sections with different inner diameters, and the inner diameter of the middle pipe section of the inner diameter variable-diameter pipe is larger than that of the pipe sections at both ends.

[0014] Further, the inner diameter variable-diameter pipe includes an end pipe and a main body pipe with different inner diameters, and the end pipe is inserted into the main body pipe.

[0015] Further, the end pipe is inserted into the main body pipe, and a clamp is provided on the outer side of the insertion part of the main body pipe and the end pipe.

[0016] Particularly, the present invention also discloses a heat management method for a battery swapping station, including the following steps:

[0017] Obtain the water resistance performance of the battery pack to be simulated itself;

[0018] Use the simulation test method to determine the variable inner diameter of the inner diameter variable-diameter pipe so that the water resistance performance of the heat exchange medium in the inner diameter variable-diameter pipe is within a preset range of the water resistance performance of the simulated battery pack itself;

[0019] Connect both ends of the inner diameter variable-diameter pipe to the water inlet pipe and the water outlet pipe respectively to form a branch;

[0020] Merge the branch into the heat exchange loop with the heat exchange medium flowing inside;

[0021] Test the flow rate of the heat exchange medium in the branch.

[0022] Further, when determining the size of the stepped surface, first obtain the resistance of the battery pack itself, and then determine the size of one of the stepped surfaces through the simulation test method.

[0023] In the present invention, an inner diameter variable-diameter pipe with a variable-diameter design is used to simulate the resistance characteristics of the battery pack, and a heating part is also provided outside the inner diameter variable-diameter pipe to simulate the heat generation amount of the battery pack, so that the working characteristics of the water-cooling pipeline inside the battery pack can be simulated without using a real battery pack for the test equipment to test. In addition, since this alternative solution is used in this embodiment, it is also unnecessary to carry a real battery pack, which is convenient for handling.

[0024] Furthermore, the inner diameter variable-diameter pipe in the present invention is set to be transparent, which can realize the function of detecting whether there are bubbles in the whole system. If there are bubbles, further measures can be taken to eliminate the bubbles, thereby improving the test accuracy.

[0025] Those skilled in the art will better understand the above and other objects, advantages and features of the present invention from the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings in an exemplary but not limiting manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0027] Figure 1 is a schematic perspective view of a test device for a heat management system of a battery swapping station according to an embodiment of the present invention;

[0028] Figure 2 is Figure 1 a schematic front view of an integral inner diameter variable-diameter pipe of the test device for the heat management system of the battery swapping station shown;

[0029] Figure 3 is Figure 2 a schematic cross-sectional view taken along the central axis of the integral inner diameter variable-diameter pipe in

[0030] Figure 4 is Figure 1 a schematic cross-sectional view showing the connection relationship between the inner diameter variable-diameter pipe and the water inlet pipe of the test device for the heat management system of the battery swapping station shown;

[0031] Figure 5 is according to an embodiment of the present invention Figure 1 a schematic front view of a split inner diameter variable-diameter pipe of the test device for the heat management system of the battery swapping station shown;

[0032] Figure 6 is Figure 5 a schematic cross-sectional view taken along the central axis of the split inner diameter variable-diameter pipe in

[0033] Figure 7 is according to an embodiment of the present invention Figure 1 a schematic front view of a split inner diameter variable-diameter pipe of the test device for the heat management system of the battery swapping station shown;

[0034] Figure 8 is Figure 7 a schematic cross-sectional view taken along the central axis of the split inner diameter variable-diameter pipe in

[0035] Figure 9 is a schematic elevation view of the inner diameter reducing pipe joint type of the test device for the heat management system of the battery swapping station according to an embodiment of the present invention; Figure 1

[0036] Figure 10 is a schematic elevation view of the inner diameter reducing pipe joint type of the test device for the heat management system of the battery swapping station according to an embodiment of the present invention; Figure 1

[0037] Figure 11 is a comparison chart of the resistance curve of the battery pack and the resistance curve of the inner diameter reducing pipe according to an embodiment of the present invention;

[0038] Figure 12 is a step diagram of the test method for the heat management system of the battery swapping station according to an embodiment of the present invention;

[0039] In the figure:

[0040] 1 - Inner diameter reducing pipe;

[0041] 11 - Intermediate pipe section;

[0042] 121 - Inlet pipe section;

[0043] 122 - Outlet pipe;

[0044] 141 - First end pipe;

[0045] 142 - Second end pipe;

[0046] 151 - First main pipe;

[0047] 152 - Second main pipe

[0048] 16 - Clamp;

[0049] 171 - First joint;

[0050] 172 - Second joint;

[0051] 173 - Third joint;

[0052] 174 - Fourth joint;

[0053] 2 - Inlet pipe;

[0054] 3 - Outlet pipe. Detailed implementation manners

[0055] Example 1

[0056] Figure 1 ​​The figure is a schematic perspective view of a thermal management system test device for a battery swap station according to one embodiment of the present invention. The thermal management system test device for a battery swap station generally includes a heat exchange circuit through which a heat exchange medium flows. The heat exchange circuit includes at least one branch, each branch including a water inlet pipe 2, a water outlet pipe 3, an inner diameter reducer 1, and a heating element. The ends of the inner diameter reducer 1 are connected to the water inlet pipe 2 and the water outlet pipe 3, respectively. The inner diameter of the inner diameter reducer 1 is set so that the error between the water resistance performance of the heat exchange medium in the inner diameter reducer 1 and the water resistance performance of the simulated battery pack itself is within a preset range. The heating element is wrapped around the outside of the inner diameter reducer 1 and generates heat in a controlled manner to simulate the heat generated by the battery pack itself, so as to at least test the flow rate of the branch.

[0057] In this embodiment, an inner diameter reducer 1 with a variable diameter design is used to simulate the resistance characteristics of the battery pack. A heating portion is also provided on the outside of the inner diameter reducer 1 to simulate the heat generated by the battery pack, so that the working characteristics of the water cooling pipeline inside the battery pack can be simulated without using a real battery pack, in preparation for testing equipment. In addition, since this alternative solution is used in this embodiment, there is no need to carry the real battery pack, which facilitates transportation.

[0058] Figure 2 yes Figure 1 The schematic front view of the integral inner diameter reducer 1 of the thermal management system test device of the battery swap station is shown. Figure 3 is along Figure 2 A schematic cross-sectional view obtained by cutting the central axis of the integral inner diameter reducer 1 in FIG. According to one embodiment of the present invention, the inner diameter reducer 1 is integral, and is specially made to have an inner tube wall with a stepped feature so as to simulate the water resistance of the water cooling pipeline in a real battery pack, where the water resistance refers to the resistance of the inside of the pipeline to the water pressure. Specifically, the inner diameter reducer 1 can be divided into three sections, namely the water inlet pipe section 121, the middle pipe section 11 and the water outlet pipe section 122, respectively. The inner diameters of the water inlet pipe section 121 and the water outlet pipe section 122 are both larger than the middle section, and the inner walls of the water inlet pipe section 121, the middle pipe section 11 and the water outlet pipe section 122 are all uniform, so a stepped feature is formed between the water inlet pipe section 121 and the middle pipe section 11, and between the middle pipe section 11 and the water outlet pipe section 122.

[0059] According to one embodiment of the present invention, to facilitate rapid testing, quick connectors are provided at the ends of the inlet pipe section 121 and the outlet pipe section 122. The quick connector in this embodiment is a first connector 171, specifically a conical protrusion located on the outside of the inlet pipe section 121 and the outlet pipe section 122. When the inner diameter reducer 1 needs to be connected to the inlet pipe 2 or the outlet pipe 3, a direct plug-in connection is sufficient. Auxiliary means such as a clamp 16, a tie band, or a wire tie can also be used to facilitate the connection.

[0060] Example 2

[0061] Figure 4 yes Figure 1 The diagram shows a schematic cross-sectional view of the connection relationship between the inner diameter reducer 1 and the water inlet pipe 2 of the thermal management system test device of the battery swap station. Figure 5 According to one embodiment of the present invention Figure 1 A schematic front view of a split inner diameter reducer 1 of a thermal management system test device for a battery swap station is shown. The difference between this embodiment and embodiment 1 is that the inner diameter reducer 1 is split, so as to form a step feature for simulating water resistance between the sub-components. Specifically, the inner diameter reducer 1 includes three parts, namely a first main body tube 151 located in the middle and end tubes located at both ends. For the convenience of description, the end tubes are respectively named as the first end tube 141 and the second end tube 142, and the first end tube 141 and the second end tube 142 are respectively plugged into the two ends of the first main body tube 151. Specifically, the inner wall of the first main body tube 151 is provided with a water flow channel and connecting channels located at both ends of the water flow channel, and the first end tube 141 and the second end tube 142 are respectively plugged into the connecting channels at both ends of the water flow channel. The inner diameters of the first end tube 141 and the second end tube 142 are uniform and larger than the inner diameter of the water flow channel of the first main tube 151. This creates a stepped feature between the first end tube 141 and the first main tube 151, and between the first main tube 151 and the second end tube 142. It will be appreciated that the inner diameters of the connecting passages at both ends of the water flow channel are equal to or slightly larger than the outer diameters of the first end tube 141 and the second end tube 142 to facilitate connection.

[0062] Example 3

[0063] Figure 7 According to one embodiment of the present invention Figure 1 The schematic front view of the split inner diameter reducer 1 of the thermal management system test device of the battery swap station is shown. Figure 8 It is along Figure 7 A schematic cross-sectional view of the split-type inner diameter reducer 1 cut along its central axis. This embodiment differs from Example 2 in that the parameters of the second main body tube 152 are different from those in Example 2, and the inner diameters of the first end tube 141 and the second end tube 142 are both smaller than the inner diameter of the water flow channel of the second main body tube 152. Consequently, a stepped feature is formed between the first end tube 141 and the second main body tube 152, and between the second main body tube 152 and the second end tube 142. This embodiment also uses a clamp 16 to facilitate the connection between the first end tube 141 and the second main body tube 152, and between the second main body tube 152 and the second end tube 142.

[0064] Example 4

[0065] Figure 6 It is along Figure 5A schematic cross-sectional view of the split internal diameter reducer 1 cut along its central axis. This embodiment differs from Examples 1-3 in that the quick-connect connector in this embodiment is a second connector 172, specifically an annular protrusion provided on the outside of the first and second end tubes 141, 142. It is understood that the connector in this embodiment can also be used for the inlet and outlet pipe sections 121, 122 in Example 1.

[0066] Example 5

[0067] Figure 9 According to one embodiment of the present invention Figure 1 A schematic elevation view of the connector type for the inner diameter reducer 1 of the thermal management system test device for a battery swap station is shown. This embodiment differs from Examples 1-3 in that the quick-connect connector in this embodiment is a third connector 173 , specifically a spiral protrusion provided on the outside of the first end tube 141 and the second end tube 142 , with the protrusion having two sections.

[0068] Example 6

[0069] Figure 10 According to one embodiment of the present invention Figure 1 The schematic elevation view of the connector type of the inner diameter reducer 1 of the thermal management system test device of the battery swap station is shown. The difference between this embodiment and embodiments 1 to 3 is that the quick-connect connector in this embodiment is the fourth connector 174, which is specifically a pagoda connector.

[0070] Example 7

[0071] Figure 12 1 is a step diagram of a method for testing a thermal management system of a battery swap station according to an embodiment of the present invention. In particular, the present invention also discloses a thermal management method for a battery swap station, comprising the following steps:

[0072] S1. Obtain the water resistance performance of the battery pack to be simulated.

[0073] S2. Determine the variable inner diameter of the inner diameter reducer 1 using a simulation test method so that the water resistance performance of the heat exchange medium in the inner diameter reducer 1 and the water resistance performance of the simulated battery pack itself are within a preset range.

[0074] S3. Connect the two ends of the inner diameter reducing pipe 1 to the water inlet pipe 2 and the water outlet pipe 3 respectively to form a branch.

[0075] S4. Connect the branch circuit to a heat exchange circuit in which a heat exchange medium flows.

[0076] S5. Test the flow rate of the heat exchange medium in the branch.

[0077] Figure 11It is a comparison diagram of the resistance curve of a battery pack and the resistance curve of the variable-diameter inner pipe 1 according to an embodiment of the present invention. According to an embodiment of the present invention, in step S2, when determining the variable-diameter inner diameter size, first obtain the resistance of the battery pack itself, and then determine the size of one of the stepped surfaces by means of simulation testing. Specifically, first select a variable-diameter inner pipe 1 with the same outer diameter as the inlet pipe 2 and the outlet pipe 3. For example, if the outer diameters of the inlet pipe 2 and the outlet pipe 3 are 16 mm, then select a variable-diameter inner pipe 1 with an outer diameter of 16 mm. Determine the specific variable-diameter size by means of simulation testing to ensure that the resistance error between the variable-diameter device and the battery pack is less than 5%. The measuring equipment and methods used in this process are all commonly used equipment by those skilled in the art and will not be elaborated here.

[0078] According to an embodiment of the present invention, in step S5, testing the flow rate of the heat exchange medium in the branch specifically includes the following steps:

[0079] S51. Equip the corresponding required number of variable-diameter inner pipes 1.

[0080] S52. Select the corresponding heating film or other heating device according to the heat generation of the battery pack.

[0081] S53. Wrap the heating film or other heating device outside the variable-diameter inner pipe 1, and wrap heat insulation cotton outside the heating film or other heating device to prevent heat dissipation and approximate the heat generation of the battery pack as much as possible.

[0082] S54. Connect the variable-diameter inner pipe 1 to the thermal management system for testing.

[0083] S55. After starting the test system, it is possible to achieve the test state of a battery pack for different real battery packs, and finally conduct a calibration test on the flow rate, temperature, and refrigerating capacity.

[0084] At this point, those skilled in the art should recognize that although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and determined to cover all these other variations or modifications.

Claims

1. A heat management system for a battery swapping station, characterized in that, A heat exchange circuit through which a heat exchange medium flows, the heat exchange circuit including at least one branch, each branch including: A water inlet pipe and a water outlet pipe; An inner diameter variable-diameter pipe, the two ends of which are respectively communicated with the water inlet pipe and the water outlet pipe, and the variable-diameter inner diameter of the inner diameter variable-diameter pipe is set such that the error between the water resistance performance of the heat exchange medium in the inner diameter variable-diameter pipe and the water resistance performance of the simulated battery pack itself is within a preset range; A heating part, wrapped outside the inner diameter variable-diameter pipe, and controllably heating to simulate the heat generation amount of the battery pack itself and at least test the flow rate of this branch.

2. The heat management system of the battery swapping station according to claim 1, wherein The inner diameter variable-diameter pipe includes a part set to be transparent for observing bubbles in the water flow therein.

3. The test device for the heat management system of the battery swapping station according to claim 1, wherein The inner diameter variable-diameter pipe includes multiple segments with different inner diameters.

4. The test device for the heat management system of the battery swapping station according to claim 1 or 3, characterized in that, The inner diameter variable-diameter pipe includes three segments with different inner diameters, and the inner diameter of the middle pipe segment of the inner diameter variable-diameter pipe is smaller than the inner diameters of the pipe segments at both ends.

5. The test device for the heat management system of the battery swapping station according to claim 1 or 3, characterized in that, The inner diameter variable-diameter pipe includes three segments with different inner diameters, and the inner diameter of the middle pipe segment of the inner diameter variable-diameter pipe is larger than the inner diameters of the pipe segments at both ends.

6. The test device for the heat management system of the battery swapping station according to claim 1, characterized in that, The inner diameter variable-diameter pipe includes an end pipe and a main pipe with different inner diameters, and the end pipe is inserted into the main pipe.

7. The test device for the heat management system of the battery swapping station according to claim 6, characterized in that, The end pipe is inserted into the main pipe, and a clamp is provided on the outside of the insertion part of the main pipe and the end pipe.

8. A heat management method for a power exchange station, characterized in that, Including the following steps: Obtain the water resistance performance of the battery pack to be simulated itself; Use a simulation test method to determine the variable-diameter inner diameter of the inner diameter variable-diameter pipe so that the error between the water resistance performance of the heat exchange medium in the inner diameter variable-diameter pipe and the water resistance performance of the simulated battery pack itself is within a preset range; Connect the two ends of the inner diameter variable-diameter pipe to the water inlet pipe and the water outlet pipe respectively to form a branch; Merge the branch into a heat exchange circuit through which a heat exchange medium flows internally; Test the flow rate of the heat exchange medium in the branch.

9. The method for thermal management of a battery swapping station according to claim 8, wherein, The inner wall of the inner diameter variable-diameter pipe has a stepped surface. When determining the size of the stepped surface, first obtain the resistance of the battery pack itself, and then determine the size of one of the stepped surfaces through a simulation test method.

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