Graded liquid cooling pipeline device of liquid cooling energy storage system

Abstract

The utility model discloses a graded liquid cooling pipeline device of a liquid cooling energy storage system, which comprises a first-stage water inlet pipeline, at least two second-stage water inlet pipelines, a first-stage water outlet pipeline and at least two second-stage water outlet pipelines, and the first-stage water inlet pipeline, the second-stage water inlet pipelines, the first-stage water outlet pipeline and the second-stage water outlet pipelines are all mounted on a liquid cooling plate in a battery pack. The plurality of liquid cooling plates are arranged in a crossing manner and are vertical to the liquid cooling plates; the first-stage water inlet pipeline is communicated with the second-stage water inlet pipeline, the first-stage water outlet pipeline is communicated with the second-stage water outlet pipeline, the second-stage water inlet pipeline is communicated with an inlet of the liquid cooling plate, and the second-stage water outlet pipeline is communicated with an outlet of the liquid cooling plate. According to the utility model, a primary pipeline is added, so that the flow resistance of the liquid cooling system is reduced, the maximum temperature difference of the battery cells is reduced, the flow distribution of the system is improved, the temperature uniformity of the battery is improved, and the service life of the battery pack can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy storage technology, in particular to a hierarchical liquid cooling pipeline device of a liquid cooling energy storage system. Background Art

[0002] As the global energy crisis and environmental pollution become increasingly severe, people's demand for electricity is getting higher and higher, and new energy has entered a period of rapid development, especially the development of new energy batteries. At present, new energy lithium batteries are widely used in the fields of energy storage and new energy vehicles. Lithium batteries have the advantages of high energy density, low self-discharge, excellent cycle performance, long service life and wide operating temperature range.

[0003] When using lithium batteries, the battery temperature will rise due to a certain degree of heat generated during charging and discharging, which will shorten the battery life. When many batteries are used in series, there will also be a certain temperature difference, which will reduce the battery efficiency. At the same time, the coolant is input into the liquid cooling plate through an inlet pipe to cool the battery module, and then it is discharged into an outlet pipe. The flow resistance is large and the distribution is uneven. Utility Model Content

[0004] In order to solve the deficiencies of the above technical solutions, the purpose of the utility model is to provide a graded liquid cooling pipeline device for a liquid cooling energy storage system.

[0005] The purpose of the utility model is achieved through the following technical solutions.

[0006] A hierarchical liquid cooling pipeline device of a liquid-cooled energy storage system comprises a primary water inlet pipeline, at least two secondary water inlet pipelines, a primary water outlet pipeline and at least two secondary water outlet pipelines, wherein the primary water inlet pipeline, the secondary water inlet pipeline, the primary water outlet pipeline and the secondary water outlet pipeline are all installed on a liquid cooling plate inside a battery pack, and are arranged vertically with the liquid cooling plate across a plurality of liquid cooling plates; the primary water inlet pipeline is connected to the secondary water inlet pipeline, the primary water outlet pipeline is connected to the secondary water outlet pipeline, the secondary water inlet pipeline is connected to the inlet of the liquid cooling plate, and the secondary water outlet pipeline is connected to the outlet of the liquid cooling plate; the coolant enters the secondary water inlet pipe through the primary water inlet pipeline, then enters the liquid cooling plate through the inlet of the liquid cooling plate for circulation, flows into the secondary water outlet pipeline through the outlet of the liquid cooling plate, and then flows out through the primary water outlet pipeline.

[0007] In the above technical solution, the number of secondary water inlet pipes is 2, the number of secondary water outlet pipes is 2, the 2 secondary water inlet pipes are arranged side by side and spaced apart, the 2 secondary water outlet pipes are arranged side by side and spaced apart, and one secondary water inlet pipe and one secondary water outlet pipe are arranged side by side in pairs.

[0008] In the above technical solution, a first branch is arranged on the first-level water inlet pipeline, one of the second-level water inlet pipelines is connected to the first-level water inlet pipeline through the first branch, and another of the second-level water inlet pipelines is connected to the pipe head of the first-level water inlet pipeline. A second branch is arranged on the first-level water outlet pipeline, one of the second-level water outlet pipelines is connected to the first-level water outlet pipeline through the second branch, and another of the second-level water outlet pipelines is connected to the pipe head of the first-level water outlet pipeline. Each of the second-level water inlet pipelines is connected to the inlet of the liquid cooling plate through a plurality of liquid inlet pipes, and each of the second-level water outlet pipelines is connected to the outlet of the liquid cooling plate through a plurality of liquid outlet pipes.

[0009] In the above technical solution, the battery pack includes 12 liquid cooling plates and 10 battery modules arranged in sequence along the length direction of the battery pack, 5 battery modules form a group, liquid cooling plates are installed at both ends of each battery module, and liquid cooling plates are installed between 2 battery modules, and a liquid inlet pipe is connected to the inlet of each liquid cooling plate, and a liquid outlet pipe is connected to the outlet.

[0010] In the above technical solution, the first branch is connected to the middle part of the secondary water inlet pipeline, dividing the secondary water inlet pipeline into two sections, each section is connected to three liquid cooling plates through three liquid inlet pipes, thereby forming six cooling liquid inflow channels.

[0011] In the above technical solution, the pipe head of the first-level water inlet pipeline is connected to the middle part of the other second-level water inlet pipeline, dividing the second-level water inlet pipeline into two sections, each section is connected to three liquid cooling plates through three liquid inlet pipes, thereby forming six cooling liquid inflow channels.

[0012] In the above technical solution, the second branch is connected to the middle part of the secondary water outlet pipeline, dividing the secondary water outlet pipeline into two sections, each section is connected to three liquid cooling plates through three liquid outlet pipes, thereby forming six cooling liquid outflow channels.

[0013] In the above technical solution, the pipe head of the first-level water outlet pipeline is connected to the middle part of the other second-level water outlet pipeline, dividing the second-level water outlet pipeline into two sections, each section is connected to three liquid cooling plates through three liquid outlet pipes, thereby forming six cooling liquid outflow channels.

[0014] The advantages and beneficial effects of the utility model are:

[0015] 1. The utility model changes the distribution of coolant from the original primary pipeline directly to 12 liquid cooling plates into firstly dividing the primary pipeline into two branches, and then dividing the two branches into six branches to enter the liquid cooling plate to cool the battery. The addition of a primary pipeline reduces the flow resistance of the liquid cooling system, reduces the maximum temperature difference of the battery cell, improves the flow distribution of the system, improves the temperature uniformity of the battery, and can increase the service life of the battery pack.

[0016] 2. The liquid cooling pipeline device of the liquid cooling energy storage system of the utility model is compared with the liquid cooling energy storage system before the change (comparative example). The maximum temperature difference of the battery is reduced from 1.8°C to 1.3°C, the maximum difference in flow distribution of the liquid cooling plate is reduced from 6% to 1.3%, the temperature uniformity of the battery pack is improved, and the flow resistance is reduced from 23KPa to 21KPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the overall structure of the liquid cooling pipeline device of the comparative example.

[0018] Figure 2 It is the pipeline flow diagram of the liquid cooling pipeline device of the comparative example.

[0019] Figure 3 This is a schematic diagram of the overall structure of the graded liquid cooling pipeline device of Example 1.

[0020] Figure 4 This is the pipeline flow diagram of the graded liquid cooling pipeline device of Example 1.

[0021] Figure 5 This is a temperature cloud diagram of the battery pack of the comparative liquid cooling pipeline device.

[0022] Figure 6 It is the temperature rise curve of some battery cells of the liquid cooling pipeline device of the comparative example.

[0023] Figure 7 It is the fluid flow velocity cloud diagram of the liquid cooling pipeline device of the comparative example.

[0024] Figure 8 This is a liquid cooling plate flow distribution table of the liquid cooling pipeline device of the comparative example.

[0025] Fig. 9 This is a temperature cloud diagram of the battery pack of the graded liquid cooling pipeline device of Example 1.

[0026] Fig.10 This is a temperature rise curve diagram of some battery cells of the graded liquid cooling pipeline device of Example 1.

[0027] Fig.11 This is a fluid flow velocity cloud diagram of the graded liquid cooling pipeline device of Example 1.

[0028] Fig.12 This is a liquid cooling plate flow distribution table of the graded liquid cooling pipeline device of Example 1.

[0029] Among them, 1: liquid cooling plate, 2: battery module, 3: primary water inlet pipeline, 4: secondary water inlet pipeline, 5: primary water outlet pipeline, 6: secondary water outlet pipeline, 7: first branch, 8: second branch, 9: liquid inlet pipe, 10: liquid outlet pipe, 11: water inlet pipeline, 12: water outlet pipeline.

[0030] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0031] The technical solution of the present utility model is further described below in conjunction with specific embodiments.

[0032] Comparative Example

[0033] like Figure 1 and Figure 2 As shown, a liquid cooling pipeline device of a liquid cooling energy storage system includes 12 liquid cooling plates 1, 10 battery modules 2, a water inlet pipeline 11 and a water outlet pipeline 12. Multiple liquid cooling plates 1 and multiple battery modules 2 are arranged in parallel in sequence. The coolant enters the liquid cooling plate 1 through the water inlet pipeline 11 to cool the battery module 2. The coolant after heat exchange with the battery flows out from the outlets of multiple liquid cooling plates 1 to the water outlet pipeline 12. The coolant is directly distributed to multiple liquid cooling plates 1. The maximum temperature of the battery core is obtained through simulation, and the results are as follows:

[0034] At the initial temperature of 25°C, the highest cell temperature is 30.2°C, the lowest temperature is 28.4°C, and the maximum temperature difference is 1.8°C. The total flow resistance of the liquid cooling plate 1 pipe is 23KPa, and the maximum flow distribution difference of the liquid cooling plate 1 is 6%. The flow distribution difference is large, and the battery pack uniformity is poor.

[0035] Example 1

[0036] like Figure 3-Figure 4 As shown, a hierarchical liquid cooling pipeline device of a liquid-cooled energy storage system includes a primary water inlet pipeline 3, two secondary water inlet pipelines 4, a primary water outlet pipeline 5 and two secondary water outlet pipelines 6, wherein the primary water inlet pipeline 3, the two secondary water inlet pipelines 4, the primary water outlet pipeline 5 and the two secondary water outlet pipelines 6 are all installed on the liquid cooling plate 1 inside the battery pack, and span multiple liquid cooling plates 1 and are vertically arranged with the liquid cooling plate 1; the primary water inlet pipeline 3 is connected with the two secondary water inlet pipelines 4, the primary water outlet pipeline 5 is connected with the two secondary water outlet pipelines 6, the two secondary water inlet pipelines 4 are connected with the inlet of the liquid cooling plate 1, and the two secondary water outlet pipelines 6 are connected with the outlet of the liquid cooling plate 1; the coolant enters the secondary water inlet pipe through the primary water inlet pipeline 3, then enters the liquid cooling plate 1 through the inlet of the liquid cooling plate 1 for circulation, flows into the secondary water outlet pipeline 6 through the outlet of the liquid cooling plate 1, and then flows out through the primary water outlet pipeline 5.

[0037] Specifically, two of the secondary water inlet pipes 4 are arranged side by side at intervals, two of the secondary water outlet pipes 6 are arranged side by side at intervals, one secondary water inlet pipe 4 and one secondary water outlet pipe 6 are arranged in parallel in pairs, a first branch 7 is arranged on the primary water inlet pipe 3, one of the secondary water inlet pipes 4 is connected to the primary water inlet pipe 3 through the first branch 7, and another of the secondary water inlet pipes 4 is connected to the pipe head of the primary water inlet pipe 3, a second branch 8 is arranged on the primary water outlet pipe 5, one of the secondary water outlet pipes 6 is connected to the primary water outlet pipe 5 through the second branch 8, and another of the secondary water outlet pipes 6 is connected to the pipe head of the primary water outlet pipe 5, each of the secondary water inlet pipes 4 is connected to the inlet of the liquid cooling plate 1 through a plurality of liquid inlet pipes 9, and each of the secondary water outlet pipes 6 is connected to the outlet of the liquid cooling plate 1 through a plurality of liquid outlet pipes 10.

[0038] Furthermore, the battery pack includes 12 liquid cooling plates 1 and 10 battery modules 2 arranged in sequence along the length direction of the battery pack, 5 battery modules 2 form a group, liquid cooling plates 1 are installed at both ends of each group of battery modules 2, and liquid cooling plates 1 are installed between 2 battery modules 2, a liquid inlet pipe 9 is connected to the inlet of each liquid cooling plate 1, and a liquid outlet pipe 10 is connected to the outlet thereof, and 3 liquid cooling plates 1 are connected in parallel as a group.

[0039] Furthermore, the first branch 7 is connected to the middle part of the secondary water inlet pipeline 4, dividing the secondary water inlet pipeline 4 into two sections, each section is connected to the three liquid cooling plates 1 through three liquid inlet pipes 9, thereby forming six cooling liquid inflow channels, the cooling liquid enters the secondary water inlet pipeline 4 from the primary water inlet pipeline 3 through the first branch 7, is divided into two streams of cooling liquid in opposite directions, and then enters the liquid cooling plate 1 from the six cooling liquid inflow channels; similarly, the pipe head of the primary water inlet pipeline 3 is connected to the middle part of the other secondary water inlet pipeline 4, dividing the secondary water inlet pipeline 4 into two sections, each section is connected to the three liquid cooling plates 1 through three liquid inlet pipes 9, thereby forming six cooling liquid inflow channels, the cooling liquid enters the secondary water inlet pipeline 4 from the pipe head of the primary water inlet pipeline 3, is divided into two streams of cooling liquid in opposite directions, and then enters the liquid cooling plate 1 from the six cooling liquid inflow channels.

[0040] Furthermore, the second branch 8 is connected to the middle of the secondary water outlet pipeline 6, and the secondary water outlet pipeline 6 is divided into two sections. Each section is connected to three liquid cooling plates 1 through three liquid outlet pipes 10, thereby forming six cooling liquid outflow channels. The cooling liquid flows from the outlet of the liquid cooling plate 1 into the six cooling liquid outflow channels, and then flows into the secondary water outlet pipeline 6. The cooling liquid flow directions of the secondary water outlet pipeline 6 sections on both sides of the second branch 8 are opposite, and finally converge into the second branch 8, and from the primary water outlet pipeline 5 Similarly, the pipe head of the primary water outlet pipeline 5 is connected with the middle part of the other secondary water outlet pipeline 6, dividing the secondary water outlet pipeline 6 into two sections, each section is connected with three liquid cooling plates 1 through three liquid outlet pipes 10, thereby forming six cooling liquid outflow channels, and the cooling liquid flow directions of the secondary water outlet pipeline 6 sections on both sides of the pipe head of the primary water outlet pipeline 5 are opposite, and finally converge at the pipe head and flow out from the primary water outlet pipeline 5, so that the cooling liquid is more evenly distributed in the liquid cooling plate 1.

[0041] Specifically, five parallel U-shaped flow channels are arranged in the main body of each liquid cooling plate 1, and a confluence section is arranged at the inlet and outlet of the liquid cooling plate 1. The coolant flows from the liquid inlet pipe 9 into the confluence section and then flows into the U-shaped flow channels respectively. The coolant after heat exchange flows from the U-shaped flow channel into the confluence section at the outlet and then enters the liquid outlet pipe 10.

[0042] The maximum temperature of the battery core is obtained through simulation, and the results are as follows:

[0043] At the initial temperature of 25°C, the maximum battery temperature is 29.1°C, the minimum temperature is 27.8°C, and the maximum temperature difference is 1.3°C. The total flow resistance of the liquid cooling plate 1 pipe is 21KPa, and the maximum difference in flow distribution of all liquid cooling plates 1 is 1.3%.

[0044] Depend on Figure 5-Figure 12 It can be seen that the comparative example directly distributes the coolant to 12 liquid cooling plates 1 through the liquid inlet pipe 9, while the embodiment first distributes the coolant to the secondary water inlet pipe 4 through two branches through the primary water inlet pipe 3, and then distributes it to 6 coolant inflow channels through each secondary water inlet pipe 4 to enter the liquid cooling plate 1. The design of the embodiment reduces the flow resistance and makes the flow distribution of the liquid cooling plate 1 more uniform. The maximum flow difference of the flow distribution of all liquid cooling plates 1 before pipeline classification is 6%, and the maximum difference of the flow distribution of all cold plates after pipeline classification is 1.3%.

[0045] Example 2

[0046] In this embodiment, a hierarchical liquid cooling pipeline device of a liquid-cooled energy storage system includes a primary water inlet pipeline 3, multiple secondary water inlet pipelines 4, multiple tertiary water inlet pipelines, a primary water outlet pipeline 5, multiple secondary water outlet pipelines 6 and multiple tertiary water outlet pipelines. The primary water inlet pipeline 3, multiple secondary water inlet pipelines 4, multiple tertiary water inlet pipelines, a primary water outlet pipeline 5, multiple secondary water outlet pipelines 6 and multiple tertiary water outlet pipelines are installed on a liquid cooling plate 1, spanning multiple liquid cooling plates 1, and the hierarchical water inlet pipelines and the hierarchical water outlet pipelines are connected through branches, ultimately forming multiple coolant inflow channels and multiple coolant outflow channels.

[0047] The battery pack includes n liquid cooling plates 1 and n-2 battery modules 2 arranged in sequence along the length direction of the battery pack. More than or equal to 3 battery modules 2 form a group. Liquid cooling plates 1 are installed at both ends of each group of battery modules 2, and a liquid cooling plate 1 is installed between two battery modules 2. The inlet of each liquid cooling plate 1 is connected to a liquid inlet pipe 9, and the outlet is connected to a liquid outlet pipe 10. More than or equal to 3 liquid cooling plates 1 form a group and are connected in parallel.

[0048] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0049] Furthermore, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0050] The above is an exemplary description of the present invention. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be done by other technical personnel in this field without expending creative labor falls within the protection scope of the present invention.

Claims

1. A hierarchical liquid cooling pipeline device for a liquid cooling energy storage system, characterized in that: It includes a primary water inlet pipeline, at least 2 secondary water inlet pipelines, a primary water outlet pipeline and at least 2 secondary water outlet pipelines, wherein the primary water inlet pipeline, the secondary water inlet pipeline, the primary water outlet pipeline and the secondary water outlet pipeline are all installed on the liquid cooling plate inside the battery pack, and are arranged vertically across multiple liquid cooling plates and the liquid cooling plate; the primary water inlet pipeline is connected with the secondary water inlet pipeline, the primary water outlet pipeline is connected with the secondary water outlet pipeline, the secondary water inlet pipeline is connected with the inlet of the liquid cooling plate, and the secondary water outlet pipeline is connected with the outlet of the liquid cooling plate; the coolant enters the secondary water inlet pipe through the primary water inlet pipeline, then enters the liquid cooling plate through the inlet of the liquid cooling plate to circulate, flows into the secondary water outlet pipeline through the outlet of the liquid cooling plate, and then flows out through the primary water outlet pipeline.

2. The hierarchical liquid cooling pipeline device of the liquid cooling energy storage system according to claim 1, characterized in that: The number of secondary water inlet pipes is 2, the number of secondary water outlet pipes is 2, the 2 secondary water inlet pipes are arranged side by side at intervals, the 2 secondary water outlet pipes are arranged side by side at intervals, and one secondary water inlet pipe and one secondary water outlet pipe are arranged side by side in pairs.

3. The hierarchical liquid cooling pipeline device of the liquid cooling energy storage system according to claim 2, characterized in that: A first branch is arranged on the first-level water inlet pipeline, one of the second-level water inlet pipelines is connected to the first-level water inlet pipeline through the first branch, another of the second-level water inlet pipelines is connected to the pipe head of the first-level water inlet pipeline, a second branch is arranged on the first-level water outlet pipeline, one of the second-level water outlet pipelines is connected to the first-level water outlet pipeline through the second branch, another of the second-level water outlet pipelines is connected to the pipe head of the first-level water outlet pipeline, each of the second-level water inlet pipelines is connected to the inlet of the liquid cooling plate through a plurality of liquid inlet pipes, and each of the second-level water outlet pipelines is connected to the outlet of the liquid cooling plate through a plurality of liquid outlet pipes.

4. The hierarchical liquid cooling pipeline device of the liquid cooling energy storage system according to claim 1, characterized in that: The battery pack includes 12 liquid cooling plates and 10 battery modules arranged in sequence along the length direction of the battery pack, with 5 battery modules in a group. Liquid cooling plates are installed at both ends of each group of battery modules, and a liquid cooling plate is installed between 2 battery modules. A liquid inlet pipe is connected to the inlet of each liquid cooling plate, and a liquid outlet pipe is connected to the outlet.

5. The hierarchical liquid cooling pipeline device of the liquid cooling energy storage system according to claim 3, characterized in that: The first branch is connected to the middle part of the secondary water inlet pipeline, dividing the secondary water inlet pipeline into two sections, each section is connected to three liquid cooling plates through three liquid inlet pipes, forming six cooling liquid inflow channels.

6. The hierarchical liquid cooling pipeline device of the liquid cooling energy storage system according to claim 5, characterized in that: The pipe head of the primary water inlet pipeline is connected to the middle of the other secondary water inlet pipeline, dividing the secondary water inlet pipeline into two sections. Each section is connected to three liquid cooling plates through three liquid inlet pipes, forming six cooling liquid inflow channels.

7. The hierarchical liquid cooling pipeline device of the liquid cooling energy storage system according to claim 3, characterized in that: The second branch is connected to the middle part of the secondary water outlet pipeline, dividing the secondary water outlet pipeline into two sections, each section is connected to three liquid cooling plates through three liquid outlet pipes, forming six cooling liquid outflow channels.

8. The hierarchical liquid cooling pipeline device of the liquid cooling energy storage system according to claim 7, characterized in that: The pipe head of the primary water outlet pipeline is connected to the middle part of the other secondary water outlet pipeline, dividing the secondary water outlet pipeline into two sections, each section is connected to three liquid cooling plates through three liquid outlet pipes, and six cooling liquid outflow channels are formed.

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