Direct cooling pipe system and energy storage device comprising same

Abstract

The present application relates to the technical field of thermal management, in particular to a direct cooling pipe system, and further to an energy storage device comprising the direct cooling pipe system. The direct cooling pipe system comprises a first loop and a second loop connected in series and configured to be respectively connected to a main refrigerant inlet and a main refrigerant outlet. The first loop comprises a first branch and a second branch arranged in parallel, wherein one of the first branch and the second branch is provided with a control valve, and the other is sequentially provided with a first temperature sensor and at least one direct cooling plate in a refrigerant flow direction. The second loop comprises a second temperature sensor and at least one direct cooling plate arranged sequentially in the refrigerant flow direction. The described configuration reduces the temperature difference between different battery packs in the two loops. Flow distribution among different battery packs in the loops can be achieved by using only one electronic expansion valve, thereby reducing the control costs of the direct cooling system, achieving flow regulation between different pipes, and meeting the requirements for temperature equalization regulation among different battery packs.

Description

A direct cooling pipeline system and an energy storage device therein.

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202422977892.2, filed on December 4, 2024, entitled “A direct cooling pipeline system and an energy storage device having the same,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of thermal management technology, specifically to a direct cooling pipeline system, and further to an energy storage device including the direct cooling pipeline system. Background Technology

[0004] Direct cooling for energy storage primarily utilizes liquid refrigerant in direct contact with the energy storage device, rapidly removing generated heat through heat exchange. A typical direct cooling system includes components such as a coolant circulation pump, coolant piping, a coolant radiator, a temperature sensor, and a direct cooling plate. The coolant circulation pump drives the coolant to circulate within the system, the coolant piping delivers the coolant to the energy storage device, and the coolant radiator dissipates heat from the coolant into the environment. Temperature sensors monitor the temperature of the energy storage device and the coolant in real time to ensure normal system operation.

[0005] Direct cooling technology mainly achieves cooling or heating functions through direct cooling plates, electronic expansion valves, etc. It is widely used in the temperature control of battery packs. By placing the battery pack on the direct cooling plate, its temperature can be regulated to ensure that the battery pack is within a reasonable temperature range. However, in the direct cooling pipeline, in order to achieve uniform distribution of pipeline flow, each loop is usually equipped with an electronic expansion valve. Multiple electronic expansion valves lead to high system control costs and make it difficult to achieve flow regulation between different pipelines in the entire direct cooling system, making it difficult to meet the temperature uniformity regulation requirements between different battery packs.

[0006] Application content

[0007] The purpose of this application is to provide a direct cooling pipeline system and an energy storage device thereon, which can reduce the control cost of the direct cooling pipeline system, realize flow regulation between different pipelines, and meet the temperature regulation requirements between different battery packs.

[0008] To achieve one of the aforementioned objectives, according to one aspect of this application, a direct cooling piping system is provided, comprising:

[0009] The first circuit includes a first branch and a second branch arranged in parallel. One of the first branch and the second branch is equipped with a control valve, and the other is equipped with a first temperature sensor and at least one direct cooling plate along the refrigerant flow direction.

[0010] The second circuit is provided with a second temperature sensor and at least one direct cooling plate sequentially arranged along the refrigerant flow direction.

[0011] The first circuit and the second circuit are connected in series and configured to be connected to the refrigerant main inlet and the refrigerant main outlet, respectively; the first temperature sensor and the second temperature sensor are both connected to the control valve signal and configured to adjust the opening of the control valve by detecting the temperature of the first circuit and the second circuit.

[0012] Optionally, along the refrigerant flow direction, the first direct cooling plate in the first circuit and the first direct cooling plate in the second circuit are both configured as guide plates, and the remaining direct cooling plates are all configured as direct cooling plates with internal flow channels, and the heat exchange area of ​​the guide plates is smaller than the heat exchange area of ​​the direct cooling plates.

[0013] Optionally, the flow channel includes: a low-temperature zone flow channel, a superheated zone flow channel, and a two-phase zone flow channel arranged sequentially outward from the middle position of the direct cooling plate. One end of the low-temperature zone flow channel is connected to the liquid inlet of the direct cooling plate, and the other end is connected to the two-phase zone flow channel. The two ends of the superheated zone flow channel are respectively connected to the liquid outlet of the direct cooling plate and the end of the two-phase zone flow channel opposite to the low-temperature zone flow channel.

[0014] Optionally, both the two-phase flow channel and the superheated flow channel are arranged in multiple parallel rows from the inside to the outside, and the distance between two adjacent rows of superheated flow channels is smaller than the distance between two adjacent rows of two-phase flow channels.

[0015] Optionally, the superheated zone channels are arranged at equal intervals from the inside to the outside, and multiple superheated zone channels converge and simultaneously connect to the liquid outlet of the direct cooling plate.

[0016] Optionally, the flow channels are symmetrically arranged in two sets with respect to the central axis of the direct cooling plate. The low-temperature flow channels of the two sets of flow channels are simultaneously connected to the liquid inlet. The direct cooling plate is provided with two liquid outlets and is configured to be connected one-to-one to the superheated flow channels of the two sets of flow channels.

[0017] Optionally, the direct cooling plate includes: a plate body, a cover body attached to the plate body, and a DC connector installed on the plate body and simultaneously communicating with the liquid inlet and the liquid outlet, wherein the flow channel is formed between the plate body and the cover body.

[0018] Optionally, the direct cooling piping system further includes:

[0019] The module retaining strip is installed on the side of the plate away from the flow channel and is configured to limit the two ends of the battery on the plate.

[0020] Optionally, two direct-cooling plates are connected in series in the first circuit, and three direct-cooling plates are connected in series in the second circuit.

[0021] Optionally, the guide plate includes: a support frame, a guide connector disposed on the support frame, an inlet side pipe disposed at one end of the support frame and connected to the outlet end of the guide connector, a plurality of inlet channels connected to the inlet side pipe, an outlet side pipe disposed at the other end of the support frame and connected to each of the inlet channels, and a plurality of outlet channels connected to the outlet side pipe, wherein the end of the outlet channel away from the outlet side pipe is connected to the inlet end of the guide connector.

[0022] Optionally, the sum of the heat exchange areas of the inlet and outlet channels of each of the guide plates is less than the total heat exchange area of ​​the direct cooling plate.

[0023] Optionally, the control valve is configured as an electronic expansion valve, and / or the first and second temperature sensors are configured as thermocouple temperature sensors.

[0024] To achieve one of the aforementioned objectives, according to another aspect of this application, an energy storage device is provided, comprising the direct cooling pipeline system described in the foregoing aspects, and a battery pack disposed on each of the direct cooling plates.

[0025] Compared with the prior art, the beneficial effects of the embodiments of this application are:

[0026] 1. By connecting the first and second branches in parallel to form the first loop, and then connecting it in series with the second loop, the opening of the control valve can be adjusted by detecting the temperature of the first and second loops. This allows the control valve to adjust the flow ratio between the first and second loops, ensuring that the flow distribution of the direct-cooling plates in the first and second loops reaches a suitable range. This facilitates reducing the temperature difference between different battery packs in the two loops. Furthermore, only one control valve is needed to achieve flow distribution between the loops, eliminating the need for a control valve on each loop. This simplifies the structure, reduces the control cost of the direct-cooling pipeline system, and facilitates flow regulation between different pipelines, meeting the temperature equalization requirements of different battery packs.

[0027] 2. By reducing the heat exchange area of ​​the flow channels of the guide plates corresponding to the battery packs at the inlets of the first and second circuits, and increasing the heat exchange area of ​​the flow channels of the direct cooling plates corresponding to the remaining battery packs, the impact of excessive temperature differences between the beginning and end of the battery packs connected in series in each circuit is reduced; the temperature uniformity of the direct cooling pipeline system is further improved; in addition, modifications are made to the structure of the direct cooling plate itself, placing the overheated flow channel in the middle position to transfer heat with the low-temperature flow channel, reducing the impact of refrigerant overheating at the outlet of the direct cooling plate on the highest temperature of the upper battery pack, and improving the temperature uniformity of the cells in different positions inside the battery pack. Attached Figure Description

[0028] The disclosure of this application will be more readily understood with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0029] In the picture:

[0030] Figure 1 is a schematic diagram of a direct cooling pipeline system provided in an embodiment of this application;

[0031] Figure 2 is a three-dimensional structural diagram of a direct cooling pipeline system provided in an embodiment of this application;

[0032] Figure 3 is a three-dimensional structural diagram of the direct cooling plate of a direct cooling pipeline system provided in an embodiment of this application;

[0033] Figure 4 is a magnified view of part A in Figure 3;

[0034] Figure 5 is a bottom view of the direct cooling plate of a direct cooling pipeline system provided in an embodiment of this application;

[0035] Figure 6 is a top view of a guide vane of a direct cooling pipeline system provided in an embodiment of this application;

[0036] Figure 7 is a schematic diagram of the structure of the guide vane in Figure 6 when the top cover is removed;

[0037] Figure 8 is a schematic diagram of an energy storage system provided in an embodiment of this application.

[0038] In the attached diagram: 1 Control valve, 2 First temperature sensor, 3 Second temperature sensor, 4 Guide plate, 41 Support frame, 42 Guide connector, 43 Inlet side pipe, 44 Inlet flow channel, 45 Outlet side pipe, 46 Outlet flow channel, 5 Direct cooling plate, 51 Inlet, 52 Outlet, 53 Low temperature zone flow channel, 54 Superheated zone flow channel, 55 Two-phase zone flow channel, 56 Plate, 57 Cover, 58 DC connector, 59 Module pressure strip, K1 First circuit, K2 Second circuit. Embodiments of the present invention

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0040] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0041] Furthermore, in the embodiments of this application, directional terms such as "upper," "lower," "left," and "right" are defined relative to the positions in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the position of the components in the accompanying drawings.

[0042] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0043] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0044] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0045] In accordance with existing technologies, traditional direct cooling pipeline systems typically equip each loop with a separate electronic expansion valve to achieve flow distribution between loops. This electronic expansion valve is used to regulate the flow of the corresponding loop. However, this configuration method has high actual cost and high system complexity. This embodiment improves upon the above-mentioned shortcomings.

[0046] Figure 1 is a schematic diagram of a direct cooling pipeline system according to one embodiment of this application, and includes: a first loop K1 and a second loop K2 connected in series and configured to be connected to the refrigerant inlet and the refrigerant outlet respectively. The first loop K1 includes a first branch and a second branch arranged in parallel. One of the first branch and the second branch is provided with a control valve 1, and the other branch is provided with a first temperature sensor 2 and at least one direct cooling plate in sequence along the refrigerant flow direction. The second loop K2 includes a second temperature sensor 3 and at least one direct cooling plate in sequence along the refrigerant flow direction. The first temperature sensor 2 and the second temperature sensor 3 are both signal connected to the control valve 1. The first temperature sensor 2 and the second temperature sensor 3 are configured to adjust the opening of the control valve 1 by detecting the temperature of the first loop K1 and the second loop K2.

[0047] In this arrangement, the direct cooling pipeline system described in this paper forms a first loop K1 by connecting the first branch and the second branch in parallel, and then connects it in series with the second loop K2. The opening of the control valve 1 can be adjusted by detecting the temperature of the first loop K1 and the second loop K2. Thus, the flow ratio between the first loop K1 and the second loop K2 can be adjusted by the control valve 1, so that the flow distribution of the direct cooling plates in the first loop K1 and the second loop K2 reaches a suitable ratio range, which is conducive to reducing the temperature difference between different battery packs in the two loops. Moreover, only one control valve 1 is needed to realize the flow distribution between each loop, without the need to equip each loop with a control valve 1. The structure is simple and reduces the control cost of the direct cooling pipeline system. At the same time, it is also convenient to realize the flow regulation between different pipelines and meet the temperature regulation requirements between different battery packs.

[0048] It is easy to see that, referring to Figures 1 and 2, the above-mentioned direct cooling pipeline system, through the series connection of the first loop K1 and the second loop K2, combined with the parallel loop in the first loop K1, utilizes the cooperation of temperature sensors and control valve 1 (e.g., electronic expansion valve) to achieve precise regulation of refrigerant flow in different loops. This design not only simplifies the structure of the control system and reduces the number of required electronic expansion valves, but also dynamically adjusts the flow ratio based on the temperature feedback of the two loops, effectively reducing the temperature difference between different battery packs, improving the pipeline's temperature regulation capability, and significantly reducing control costs and system complexity, while enhancing system stability and reliability. It can meet the user's dual needs for cost reduction and performance improvement.

[0049] It can be seen that by regulating the flow of the first loop K1 and the second loop K2, the temperature difference between different battery packs in the two loops is effectively reduced, and the temperature regulation capability of the pipeline is improved.

[0050] The following will illustrate further specific implementations or refinements of the board enclosure assembly through exemplary description, in order to further improve it or for other improvement considerations.

[0051] Optionally, referring to Figures 1 and 2, along the refrigerant flow direction, the first direct cooling plate in the first loop K1 and the first direct cooling plate in the second loop K2 are both configured as guide plates 4, and the remaining direct cooling plates are all configured as direct cooling plates 5 with internal flow channels, and the heat exchange area of ​​the guide plates 4 is smaller than the heat exchange area of ​​the direct cooling plates 5.

[0052] It can be seen that by reducing the heat exchange area of ​​the guide plate 4 corresponding to the battery pack at the inlet of the first loop K1 and the second loop K2, increasing the heat exchange area of ​​the internal flow channel of the direct cooling plate 5 corresponding to the other battery packs, and increasing the heat exchange area of ​​the direct cooling plate corresponding to the battery pack in the later section, the influence of the excessive temperature difference between the beginning and end of the multiple battery packs connected in series in each loop is reduced, and the temperature uniformity of the direct cooling pipeline system is further improved.

[0053] Specifically, the arrangement of the aforementioned guide plate 4 and direct cooling plate 5 can be adjusted as needed. For example, along the flow direction of the refrigerant, the direct cooling plates of the first few battery packs in the first circuit K1 can be set as guide plates 4, and the direct cooling plates of the rear battery packs can be set as direct cooling plates 5. By utilizing the smaller heat exchange area of ​​the guide plate 4 and the larger heat exchange area of ​​the direct cooling plate 5, the distribution ratio of the refrigerant in each direct cooling plate can be optimized, thereby reducing the temperature difference between the front and rear battery packs.

[0054] Furthermore, the number of direct cooling plates in the first circuit K1 and the second circuit K2 can be selected according to the number of battery packs, and can be set as a flow guide plate 4 or a direct cooling plate 5 to enhance the temperature uniformity of the direct cooling pipeline system and improve the cooling efficiency and service life of the battery pack. Therefore, the number of direct cooling plates and the specific settings of the flow guide plate 4 and the direct cooling plate 5 can be selected as needed, and this embodiment does not make specific limitations here.

[0055] Optionally, referring to Figures 3, 4 and 5, the flow channel includes: a low-temperature zone flow channel 53, a superheated zone flow channel 54 and a two-phase zone flow channel 55 arranged sequentially outward from the middle position of the direct cooling plate 5. One end of the low-temperature zone flow channel 53 is connected to the liquid inlet 51 of the direct cooling plate 5, and the other end is connected to the two-phase zone flow channel 55. The two ends of the superheated zone flow channel 54 are respectively connected to the liquid outlet 52 of the direct cooling plate 5 and the end of the two-phase zone flow channel 55 away from the low-temperature zone flow channel 53.

[0056] It can be seen that by setting a flow channel inside the direct cooling plate 5, the overheating flow channel 54 is set in the middle position, so that it can transfer heat with the low temperature flow channel 53, reducing the impact of the overheated refrigerant at the end of the flow channel on the highest temperature of the battery pack above, thereby improving the temperature uniformity of the cells in different positions inside the battery pack.

[0057] It is easy to see that through the structural design of the flow channel inside the direct cooling plate 5, the reasonable layout of the low temperature zone, overheat zone and two-phase zone arranged outward from the center of the plate 56 along the first direction balances the temperature of different areas of the battery pack, avoids local overheating, and significantly improves the overall heat dissipation performance of the battery pack located above the direct cooling plate 5.

[0058] Based on this, referring to Figure 5, both the two-phase flow channel 55 and the superheated flow channel 54 are arranged in multiple parallel rows from the inside to the outside, and the distance between two adjacent rows of superheated flow channels 54 is smaller than the distance between two adjacent rows of two-phase flow channels 55.

[0059] It can be seen that, since the spacing between the superheated zone flow channels 54 is smaller than the spacing between two adjacent two-phase zone flow channels 55, the flow area of ​​the two-phase zone flow channel 55 is larger than that of the superheated zone flow channel 54, thus ensuring the temperature uniformity between the two-phase zone flow channel 55 and the superheated zone flow channel 54.

[0060] Furthermore, the heat exchange areas of the superheated zone flow channel 54 and the two-phase zone flow channel 55 can be adjusted as needed to adapt to the direct cooling requirements of different situations. Therefore, the specific structure and arrangement of the flow channels can be selected as needed, and this embodiment does not impose specific limitations here.

[0061] Optionally, the flow channel can be integrally formed by stamping or extrusion, or other processing methods can be used. This embodiment does not make specific limitations here.

[0062] Optionally, referring to Figure 5, in this embodiment, the superheated zone channels 54 are arranged at equal intervals from the inside to the outside, and multiple superheated zone channels 54 converge and simultaneously communicate with the liquid outlet 52 of the direct cooling plate 5.

[0063] It is easy to see that by using the equidistant arrangement of the overheating zone flow channels 54, not only is the heat transfer efficiency optimized, but the temperature of different areas of the battery pack is also ensured to be balanced, avoiding local overheating and significantly improving the overall performance and safety of the battery pack.

[0064] In actual operation, referring to Figure 5, two sets of flow channels are symmetrically arranged relative to the central axis of the direct cooling plate 5. The low-temperature flow channels 53 of the two sets of flow channels are simultaneously connected to the liquid inlet 51. The direct cooling plate 5 is provided with two liquid outlets 52 and is configured to be connected to the superheated flow channels 54 of the two sets of flow channels in a one-to-one correspondence.

[0065] It can be seen that by symmetrically arranging two sets of flow channels on the direct cooling plate 5, the flow channels can be evenly distributed on the direct cooling plate 5. The flow channel system is symmetrically distributed with the central axis of the direct cooling plate 5 as a reference, which helps to improve the flow efficiency of the refrigerant on the direct cooling plate 5. The refrigerant is supplied to the two sets of flow channels through the liquid inlet 51, thereby ensuring the uniform distribution of the refrigerant, ensuring the temperature balance of different areas of the battery pack, avoiding local overheating, and significantly improving the overall performance and safety factor of the battery pack.

[0066] The aforementioned flow channels can also be arranged in different ways on the direct cooling plate 5 as needed. The specific structure and function can be selected as needed, and this embodiment does not make specific limitations here.

[0067] Optionally, referring to Figures 3 and 4, the direct cooling plate 5 includes: a plate body 56, a cover 57 attached to the plate body 56, and a DC connector 58 installed on the plate body 56 and simultaneously connected to the liquid inlet 51 and the liquid outlet 52, with a flow channel formed between the plate body 56 and the cover 57.

[0068] It can be seen that by setting the cover 57 to cooperate with the plate 56, a flow channel is formed between the two, which ensures the sealing of the flow channel system and prevents refrigerant or working fluid leakage. The DC connector 58 is connected to the liquid inlet 51 and the liquid outlet 52 at the same time, ensuring the effective flow of refrigerant. At the same time, the combined structure of the plate 56 and the cover 57 also enhances the structural stability of the entire direct cooling plate 5, making it easy to open it for maintenance when needed.

[0069] Optionally, the cover 57 can be fixed to the plate 56 by welding, bonding, riveting, or other methods. Therefore, the specific installation method is not a limiting provision of this embodiment.

[0070] Optionally, referring to Figures 3 and 4, the system also includes a module retaining strip 59 mounted on the side of the plate 56 away from the flow channel and configured to limit the two ends of the battery on the plate 56.

[0071] It can be known that the DC connector 58 can be connected to the liquid inlet 51 and the liquid outlet 52, so as to facilitate the connection of the direct cooling plate to the pipeline system. The module pressure strip 59 is installed on the side of the cover 57 away from the plate 56. Its main function is to position and limit the battery pack above the cover 57, so as to facilitate the installation of the battery pack on the direct cooling plate for temperature regulation.

[0072] In actual operation, referring to Figures 1 and 2, the first circuit K1 has two direct cooling plates connected in series, and the second circuit K2 has three direct cooling plates connected in series.

[0073] It can be seen that by setting different numbers of direct cooling plates in the first and second loops K2, the refrigerant flow is ensured to be distributed as needed between different loops, thus guaranteeing the temperature uniformity of the direct cooling pipeline.

[0074] Optionally, the first circuit K1 and the second circuit K2 are respectively installed with direct cooling plates, which can be adjusted and selected as needed. The setting method in this embodiment is only a preferred option and is not a limiting provision of this embodiment.

[0075] In actual operation, referring to Figures 6 and 7, the guide plate 4 includes: a support frame 41, a guide connector 42 disposed on the support frame 41, an inlet side pipe 43 disposed at one end of the support frame 41 and connected to the outlet end of the guide connector 42, a plurality of inlet channels 44 connected to the inlet side pipe 43, an outlet side pipe 45 disposed at the other end of the support frame 41 and connected to each inlet channel 44, and a plurality of outlet channels 46 connected to the outlet side pipe 45, wherein the end of the outlet channel 46 away from the outlet side pipe 45 is connected to the inlet end of the guide connector 42.

[0076] In one embodiment, referring to Figures 6 and 7, the sum of the heat exchange areas of the inlet channel 44 and the outlet channel 46 of each guide plate 4 is less than the total heat exchange area of ​​the direct cooling plate 5.

[0077] It is easy to see that the support frame 41 with inlet and outlet liquid ports 52 facilitates its connection to the direct cooling pipeline system. The sum of the heat exchange areas of the inlet flow channel 44 and the outlet flow channel 46 on the support frame 41 is less than the total heat exchange area of ​​the direct cooling plate 5, which makes it easy to select different direct cooling plates according to different locations in the direct cooling pipeline system, so as to adapt to the heat exchange requirements of different pipe sections in the system.

[0078] Optionally, referring to Figures 1 and 2, the first control valve 1 is configured as an electronic expansion valve, and / or the first temperature sensor 2 and the second temperature sensor 3 are configured as thermocouple temperature sensors.

[0079] Optionally, the above-mentioned electronic expansion valve can be a pilot-operated electronic expansion valve or a direct-acting electronic expansion valve; the above-mentioned temperature sensor can also be a resistance temperature detector (RTD) sensor. The specific type can be selected as needed, and this embodiment does not make specific limitations here.

[0080] This embodiment also provides an energy storage device, referring to FIG8, including: the direct cooling pipeline system as described above, and a battery pack disposed on each direct cooling plate.

[0081] It can be seen that by applying the above-mentioned direct cooling pipeline system to an energy storage device, the first and second branches are connected in parallel to form the first loop K1, which is then connected in series with the second loop K2. The opening of the control valve 1 can be adjusted by detecting the temperature of the first loop K1 and the second loop K2. This allows the flow ratio between the first loop K1 and the second loop K2 to be adjusted accordingly, so that the flow distribution of the direct cooling plates in the first loop K1 and the second loop K2 reaches a suitable ratio range, which helps to reduce the temperature difference between different battery packs in the two loops. Moreover, only one control valve 1 is needed to achieve the flow distribution between each loop, eliminating the need to equip each loop with a control valve 1. This simplifies the structure, reduces the control cost of the direct cooling pipeline system, and facilitates flow regulation between different pipelines, meeting the temperature uniformity regulation requirements between different battery packs and improving the temperature uniformity between different battery packs in the energy storage device.

[0082] It should be noted that the above-mentioned direct cooling pipeline system can also be applied to other fields to achieve heat dissipation for different objects. Therefore, the specific application scenarios can be selected according to the needs, and this embodiment does not make specific limitations here.

[0083] The above examples primarily illustrate the direct cooling pipeline system and the energy storage device including the direct cooling pipeline system of this application. Although only some embodiments of this application have been described, those skilled in the art should understand that this application can be implemented in many other forms without departing from its spirit and scope. Therefore, the examples and embodiments shown are considered illustrative rather than restrictive, and this application may cover various modifications and substitutions without departing from the spirit and scope of the technical solution of this application. Industrial applicability

[0084] In summary, the embodiments of this application provide a direct cooling pipeline system and an energy storage device thereon, which can reduce the control cost of the direct cooling pipeline system, realize flow regulation between different pipelines, and meet the temperature regulation requirements between different battery packs.

Claims

1. A direct-cooled line system, characterized in that include: The first circuit includes a first branch and a second branch arranged in parallel. One of the first branch and the second branch is equipped with a control valve, and the other is equipped with a first temperature sensor and at least one direct cooling plate along the refrigerant flow direction. The second circuit includes a second temperature sensor arranged sequentially along the refrigerant flow direction and at least one direct cooling plate. The first circuit and the second circuit are connected in series and configured to be connected to the main refrigerant inlet and the main refrigerant outlet, respectively. Both the first temperature sensor and the second temperature sensor are connected to the control valve signal and are configured to adjust the opening of the control valve by detecting the temperature of the first circuit and the second circuit.

2. A direct cooling line system according to claim 1, characterized in that Along the refrigerant flow direction, the first direct cooling plate in the first circuit and the first direct cooling plate in the second circuit are both configured as guide plates, and the remaining direct cooling plates are all configured as direct cooling plates with internal flow channels, and the heat exchange area of ​​the guide plate is smaller than the total heat exchange area of ​​the internal flow channels of the direct cooling plate.

3. A direct cooling line system according to claim 2, characterized in that The flow channels include: a low-temperature zone flow channel, a superheated zone flow channel, and a two-phase zone flow channel arranged sequentially outward from the middle position of the direct cooling plate. One end of the low-temperature zone flow channel is connected to the liquid inlet of the direct cooling plate, and the other end is connected to the two-phase zone flow channel. The two ends of the superheated zone flow channel are respectively connected to the liquid outlet of the direct cooling plate and the end of the two-phase zone flow channel opposite to the low-temperature zone flow channel.

4. A direct cooling line system according to claim 3, characterized in that Both the two-phase flow channel and the superheated flow channel are arranged in multiple parallel rows from the inside to the outside, and the distance between two adjacent rows of superheated flow channels is smaller than the distance between two adjacent rows of two-phase flow channels.

5. A direct cooling pipeline system according to claim 3 or 4, characterized in that, The superheated zone channels are arranged at equal intervals from the inside to the outside, and multiple superheated zone channels converge and simultaneously connect to the liquid outlet of the direct cooling plate.

6. A direct cooling line system according to any one of claims 3-5, characterized in that The flow channels are arranged symmetrically with respect to the central axis of the direct cooling plate in two sets. The low-temperature flow channels of the two sets of flow channels are simultaneously connected to the liquid inlet. The direct cooling plate is provided with two liquid outlets and is configured to be connected to the superheated flow channels of the two sets of flow channels in a one-to-one correspondence.

7. A direct cooling line system according to any one of claims 2-6, characterized in that The direct cooling plate includes: a plate body, a cover body attached to the plate body, and a DC connector installed on the plate body and simultaneously connected to the liquid inlet and the liquid outlet, wherein the flow channel is formed between the plate body and the cover body.

8. A direct cooling line system according to claim 7, characterized in that Also includes: The module retaining strip is installed on the side of the plate away from the flow channel and is configured to limit the two ends of the battery on the plate.

9. A direct cooling line system according to any of claims 1-8, characterized in that The first circuit has two direct cooling plates connected in series, and the second circuit has three direct cooling plates connected in series.

10. A direct cooling line system according to any one of claims 2-9, characterized in that The guide plate includes: a support frame, a guide connector disposed on the support frame, an inlet side pipe disposed at one end of the support frame and connected to the outlet end of the guide connector, a plurality of inlet channels connected to the inlet side pipe, an outlet side pipe disposed at the other end of the support frame and connected to each of the inlet channels, and a plurality of outlet channels connected to the outlet side pipe, wherein the end of the outlet channel away from the outlet side pipe is connected to the inlet end of the guide connector.

11. A direct cooling line system according to any of claims 2-10, characterized in that The sum of the heat exchange areas of the inlet and outlet channels of each of the aforementioned guide plates is less than the total heat exchange area of ​​the direct cooling plates.

12. A direct cooling piping system according to any one of claims 1-11, characterized in that, The control valve is configured as an electronic expansion valve, and / or Both the first and second temperature sensors are configured as thermocouple temperature sensors.

13. An energy storage device, characterized by, Includes the direct cooling piping system as described in any one of claims 1-12, and a battery pack disposed on each of the direct cooling plates.

Images