Direct cooling pipeline system and energy storage device with same

Abstract

The utility model relates to the technical field of heat management, in particular to a direct cooling pipeline system and further relates to an energy storage device comprising the direct cooling pipeline system.The direct cooling pipeline system comprises a first loop and a second loop which are connected in series and configured to be connected to a main refrigerant inlet and a main refrigerant outlet correspondingly; the first loop comprises a first branch and a second branch which are arranged in parallel, one of the first branch and the second branch is provided with a control valve, and the other one of the first branch and the second branch is sequentially provided with a first temperature sensor and at least one direct cooling plate in the refrigerant flowing direction. The second loop comprises a second temperature sensor and at least one direct cooling plate which are sequentially arranged in the refrigerant flowing direction. According to the arrangement, the temperature difference between different battery packs in the two loops is reduced; the flow distribution among different battery packs of each loop can be realized only by one electronic expansion valve, so that the control cost of the direct cooling system is reduced, the flow regulation and control among different pipelines are realized, and the uniform temperature regulation requirements among different battery packs are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal management, in particular to a direct cooling pipeline system, and further relates to an energy storage device comprising the same. BACKGROUND

[0002] The energy storage direct cooling heat dissipation mainly adopts the mode of liquid coolant directly contacting the energy storage device, and the generated heat is rapidly taken away through heat exchange; the energy storage direct cooling heat dissipation system usually includes a cooling liquid circulating pump, a cooling liquid pipeline, a cooling liquid radiator, a temperature sensor, a direct cooling plate and the like; the cooling liquid circulating pump is responsible for driving the cooling liquid to circulate in the system; the cooling liquid pipeline delivers the cooling liquid to the energy storage device; the cooling liquid radiator dissipates the heat in the cooling liquid to the environment; and the temperature sensor monitors the temperature of the energy storage device and the cooling liquid in real time to ensure the normal operation of the system.

[0003] The direct cooling technology mainly realizes the refrigeration or heating function through a direct cooling plate, an electronic expansion valve and the like; it is widely applied in the temperature regulation of battery packs, and the temperature of the battery pack can be regulated by placing it on the direct cooling plate to ensure that the battery pack is within a reasonable temperature range; however, in the direct cooling pipeline, in order to realize the uniform distribution of the flow of the pipeline, an electronic expansion valve is usually provided for each circuit, and multiple electronic expansion valves result in high system control cost, and it is inconvenient to realize the flow regulation between different pipelines in the entire direct cooling system, and it is difficult to meet the uniform temperature regulation requirements between different battery packs. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a direct cooling pipeline system and an energy storage device with the same, which can realize the flow regulation between different pipelines and meet the uniform temperature regulation requirements between different battery packs on the basis of reducing the control cost of the direct cooling pipeline system.

[0005] In order to realize one of the aforementioned purposes, according to one aspect of the present application, a direct cooling pipeline system is provided, which comprises:

[0006] A first circuit comprising a first branch and a second branch arranged in parallel, one of the first branch and the second branch being provided with a control valve, and the other being provided with a first temperature sensor and at least one direct cooling plate element in sequence along the flow direction of the coolant;

[0007] A second circuit comprising a second temperature sensor and at least one direct cooling plate element in sequence along the flow direction of the coolant;

[0008] The first circuit and the second circuit are connected in series and are configured to be connected to a coolant total inlet and a coolant total outlet respectively; the first temperature sensor and the second temperature sensor are both signal connected to the control valve, and are configured to adjust the opening degree of the control valve by detecting the temperature of the first circuit and the second circuit.

[0009] In addition to one or more of the above and as an alternative, in further embodiments, the first straight cooling plate member in the first circuit and the first straight cooling plate member in the second circuit are both configured as a flow guide plate, and the rest of the straight cooling plate members are configured as straight cooling plates with flow channels formed inside, and the heat exchange area of the flow guide plate is smaller than that of the straight cooling plate.

[0010] In addition to one or more of the above and as an alternative, in further embodiments, the flow channel includes: a low-temperature zone flow channel, a superheated zone flow channel, and a two-phase zone flow channel arranged outward in sequence from the middle of the straight cooling plate, one end of the low-temperature zone flow channel is in communication with the liquid inlet of the straight cooling plate, and the other end is in communication with the two-phase zone flow channel, and the two ends of the superheated zone flow channel are in communication with the liquid outlet of the straight cooling plate and the end of the two-phase zone flow channel away from the low-temperature zone flow channel, respectively.

[0011] In addition to one or more of the above and as an alternative, in further embodiments, the two-phase zone flow channel and the superheated zone flow channel are both arranged in multiple columns from inside to outside, and the spacing between adjacent two columns of superheated zone flow channels is smaller than the spacing between adjacent two columns of two-phase zone flow channels.

[0012] In addition to one or more of the above and as an alternative, in further embodiments, the superheated zone flow channels are arranged at equal intervals from inside to outside, and multiple superheated zone flow channels converge and simultaneously communicate with the liquid outlet of the straight cooling plate.

[0013] In addition to one or more of the above and as an alternative, in further embodiments, the flow channel is symmetrically provided with two groups relative to the center axis of the straight cooling plate, the low-temperature zone flow channels of the two groups of flow channels simultaneously communicate with the liquid inlet, the straight cooling plate is provided with two liquid outlets and is configured to be connected to the superheated zone flow channels of the two groups of flow channels one by one.

[0014] In addition to one or more of the above and as an alternative, in further embodiments, the straight cooling plate includes: a plate body, a cover body attached to the plate body, and a direct current joint mounted on the plate body and simultaneously communicating with the liquid inlet and the liquid outlet, and the flow channel is formed between the plate body and the cover body.

[0015] In addition to one or more of the above and as an alternative, in further embodiments, it further includes:

[0016] A module pressing strip is mounted on the side of the plate body away from the flow channel and is configured to limit the two ends of the battery on the plate body.

[0017] In addition to one or more of the above, or as an alternative, in further embodiments, two straight cooling plate members are connected in series in the first circuit, and three straight cooling plate members are connected in series in the second circuit.

[0018] In addition to one or more of the above, or as an alternative, in further embodiments, the flow guide plate comprises a support frame, a flow guide joint provided on the support frame, a liquid inlet side pipe provided on one end of the support frame and communicated with an outlet end of the flow guide joint, a plurality of liquid inlet flow channels communicated with the liquid inlet side pipe, a liquid outlet side pipe provided on the other end of the support frame and communicated with each of the liquid inlet flow channels, and a plurality of liquid outlet flow channels communicated with the liquid outlet side pipe, the liquid outlet flow channels being communicated with an inlet end of the flow guide joint away from one end of the liquid outlet side pipe.

[0019] In addition to one or more of the above, or as an alternative, in further embodiments, the sum of the heat exchange areas of the liquid inlet flow channels and the liquid outlet flow channels of each flow guide plate is less than the total heat exchange area of the straight cooling plate.

[0020] In addition to one or more of the above, or as an alternative, in further embodiments, the control valve is configured as an electronic expansion valve, and / or the first temperature sensor and the second temperature sensor are configured as thermocouple temperature sensors.

[0021] In order to achieve one of the aforementioned purposes, according to another aspect of the present application, a kind of energy storage device is provided, including the straight cooling pipe system in the foregoing aspect, and battery pack is arranged on each of the straight cooling plate member.

[0022] Compared with the prior art, the beneficial effects of the present application are:

[0023] 1、 by connecting the first branch and the second branch in parallel to form the first circuit, and then connecting the second circuit in series, the opening of the control valve can be adjusted by detecting the temperature of the first circuit and the second circuit, so that the flow ratio between the first circuit and the second circuit is adjusted by the control valve, so that the flow distribution of the straight cooling plate members in the first circuit and the second circuit reaches a suitable proportion range, which facilitates reducing the temperature difference between different battery packs in the two circuits; And only one control valve can realize the flow distribution between each circuit, without arranging a control valve on each circuit, which reduces the control cost of the straight cooling pipe system while simplifying the structure, and also facilitates the flow regulation between different pipes, and meets the uniform temperature regulation demand between different battery packs.

[0024] 2. By reducing the heat exchange area of the flow channel of the battery pack corresponding to the guide plate at the inlet of the first loop and the second loop, and increasing the heat exchange area of the flow channel of the straight cooling plate corresponding to the remaining battery packs, the influence of the excessive temperature difference between the head and tail of each battery pack in series is reduced, the temperature uniformity of the straight cooling pipe system is further improved, in addition, the straight cooling plate structure itself is changed, the flow channel of the overheating area is arranged at the middle position to transfer heat with the flow channel of the low temperature area, the influence of the overheating of the refrigerant at the outlet of the straight cooling plate on the highest temperature of the battery pack above is reduced, and the temperature uniformity of the battery cells at different positions in the battery pack is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] The disclosure of the present application will be more readily understood with reference to the accompanying drawings. It should be understood that these drawings are only for the purpose of illustration and are not intended to limit the scope of protection of the present application.

[0026] In the drawings:

[0027] Figure 1 A structural schematic diagram of a straight cooling pipe system is provided for the utility model.

[0028] Figure 2 A three-dimensional structural diagram of a straight cooling pipe system is provided for the utility model.

[0029] Figure 3 A three-dimensional structural diagram of a straight cooling plate of a straight cooling pipe system is provided for the utility model.

[0030] Figure 4 A Figure 3 A local enlarged view of A in the middle.

[0031] Figure 5 A bottom view of the plate body of the straight cooling plate of the straight cooling pipe system is provided for the utility model.

[0032] Figure 6 A top view of the guide plate of the straight cooling pipe system is provided for the utility model.

[0033] Figure 7 A Figure 6 A structural schematic diagram of the guide plate in the middle when the top cover plate is removed.

[0034] Figure 8 A structural schematic diagram of an energy storage system is provided for the utility model.

[0035] In the drawings: 1 control valve, 2 first temperature sensor, 3 second temperature sensor, 4 flow guide plate, 41 support frame body, 42 flow guide joint, 43 liquid inlet side pipe, 44 liquid inlet flow channel, 45 liquid outlet side pipe, 46 liquid outlet flow channel, 5 straight cooling plate, 51 liquid inlet, 52 liquid outlet, 53 low-temperature zone flow channel, 54 superheated zone flow channel, 55 two-phase zone flow channel, 56 plate body, 57 cover body, 58 straight flow joint, 59 module pressing strip, K1 first circuit, K2 second circuit. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will further describe the specific technical solutions of the present application with reference to the drawings in the embodiments of the present application. The following embodiments are used to explain the present application, but not to limit the scope of the present application.

[0037] In the embodiments of the present application, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0038] In addition, in the embodiments of the present application, the orientation terms such as "up", "down", "left" and "right" are defined with respect to the orientation of the components shown in the drawings. It should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the orientation of the components placed in the drawings.

[0039] In the embodiments of the present application, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, "connection" can be fixed connection, or detachable connection, or integral; can be directly connected, or indirectly connected through intermediate medium.

[0040] In the embodiments of the present application, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. Without more limitation, the element defined by the sentence "including a…" does not exclude the existence of other same elements in the process, method, article or device including the element.

[0041] In the embodiments of the present application, the word "exemplary" or "for example" is used to mean serving as an example, instance, or illustration. Any embodiment or design described in the embodiments of the present application as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the word "exemplary" or "for example" is used to present concepts in a concrete manner.

[0042] With reference to the prior art, in order to realize the flow distribution between the circuits, the conventional direct cooling pipeline system usually separately provides an electronic expansion valve in each circuit, and adjusts the flow of the corresponding circuit by using the electronic expansion valve. However, the configuration mode has high actual cost and high system complexity. The embodiments are improved in view of the above defects.

[0043] Figure 1 is a structural schematic diagram of a direct cooling pipeline system according to an embodiment of the present application, and includes a first circuit K1 and a second circuit K2 connected in series and configured to be connected to a total refrigerant inlet and a total refrigerant outlet respectively. The first circuit K1 includes a first branch and a second branch connected in parallel. One of the first branch and the second branch is provided with a control valve 1, and the other one is sequentially provided with a first temperature sensor 2 and at least one direct cooling plate member in the refrigerant flow direction. The second circuit K2 includes a second temperature sensor 3 and at least one direct cooling plate member sequentially provided in the refrigerant flow direction. The first temperature sensor 2 and the second temperature sensor 3 are signal connected with the control valve 1. The first temperature sensor 2 and the second temperature sensor 3 are configured to adjust the opening degree of the control valve 1 by detecting the temperatures of the first circuit K1 and the second circuit K2.

[0044] In this arrangement, the direct cooling pipeline system described herein can adjust the opening degree of the control valve 1 by detecting the temperatures of the first circuit K1 and the second circuit K2, so as to adjust the flow ratio between the first circuit K1 and the second circuit K2 by using the control valve 1, so that the flow distribution of the direct cooling plate members in the first circuit K1 and the second circuit K2 reaches a proper proportion range, thereby facilitating to reduce the temperature difference between different battery packs in the two circuits. Only one control valve 1 is needed to realize the flow distribution between the circuits, without providing a control valve 1 on each circuit, thereby reducing the control cost of the direct cooling pipeline system while simplifying the structure, and facilitating to realize the flow regulation between different pipelines and meet the uniform temperature regulation requirements between different battery packs.

[0045] It can be seen that, with reference to Figure 1 and Figure 2The above straight cooling pipeline system is connected in series by the first loop K1 and the second loop K2, combined with the parallel loop in the first loop K1, and the temperature sensor and the control valve 1 (for example, an electronic expansion valve) are matched to realize accurate adjustment of the refrigerant flow of different loops. Such a design not only simplifies the structure of the control system and reduces the number of electronic expansion valves required, but also dynamically adjusts the flow ratio according to the temperature feedback of the two loops, effectively reduces the temperature difference between different battery packs in the two loops, improves the uniform temperature adjustment capability of the pipeline, significantly reduces the control cost and system complexity, enhances the stability and reliability of the system, and meets the dual needs of users for cost reduction and performance improvement.

[0046] It can be seen that by adjusting 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 uniform temperature adjustment capability of the pipeline is improved.

[0047] Further specific implementations or refinements, improvements of the board card insertion box assembly will be described below by way of example in order to further improve it or for other improvement considerations.

[0048] In one case of the embodiment, referring to Figure 1 and Figure 2 , along the flow direction of the refrigerant, the first straight cooling plate in the first loop K1 and the first straight cooling plate in the second loop K2 are both configured as flow guide plates 4, and the remaining straight cooling plates are all configured as straight cooling plates 5 with flow channels inside, and the heat exchange area of the flow guide plate 4 is smaller than that of the straight cooling plate 5.

[0049] It can be seen that by reducing the heat exchange area of the flow guide plate 4 corresponding to the battery pack at the inlet of the first loop K1 and the second loop K2, and increasing the heat exchange area of the internal flow channel of the straight cooling plate 5 corresponding to the remaining battery packs, and increasing the heat exchange area of the straight cooling plate corresponding to the battery pack at the rear, the influence of the excessive temperature difference between the head and tail battery packs in the series of battery packs in each loop is reduced, and the uniformity of the straight cooling pipeline system is further improved.

[0050] Specifically, the arrangement of the flow guide plate 4 and the straight cooling plate 5 can also be adjusted as needed, such as arranging the straight cooling plates of the first several battery packs in the first loop K1 as flow guide plates 4 and the straight cooling plates of the several battery packs at the rear as straight cooling plates 5, using the smaller heat exchange area of the flow guide plate 4 and the larger heat exchange area of the straight cooling plate 5 to optimize the distribution ratio of the refrigerant in each straight cooling plate, thereby reducing the temperature difference between the head and tail battery packs.

[0051] Exemplarily, the number of the straight cooling plate in the first circuit K1 and the second circuit K2 can be selected according to the number of the battery pack, and the structure of the flow guide plate 4 or the straight cooling plate 5 is correspondingly arranged to strengthen the temperature uniformity of the straight cooling pipe system and improve the cooling efficiency and service life of the battery pack. Therefore, the number of the straight cooling plate, the specific arrangement of the flow guide plate 4 and the straight cooling plate 5 can be selected as needed, and the embodiment is not limited in detail herein.

[0052] In another case of the embodiment, referring to Figure 3 , Figure 4 and Figure 5 , the flow channel includes: low-temperature zone flow channel 53, overheated zone flow channel 54 and two-phase zone flow channel 55 arranged outward in sequence from the middle position of the straight cooling plate 5. One end of the low-temperature zone flow channel 53 is in communication with the liquid inlet 51 of the straight cooling plate 5, and the other end is in communication with the two-phase zone flow channel 55. The two ends of the overheated zone flow channel 54 are respectively in communication with the liquid outlet 52 of the straight cooling plate 5 and the end of the two-phase zone flow channel 55 away from the low-temperature zone flow channel 53.

[0053] It can be seen that by arranging the flow channel in the interior of the straight cooling plate 5 and arranging the overheated zone flow channel 54 at the middle position, heat transfer can be performed with the low-temperature zone flow channel 53, thereby reducing the influence of overheated refrigerant at the end of the flow channel on the highest temperature of the battery pack above, and further improving the temperature uniformity of the battery pack at different positions.

[0054] It can be seen that by arranging the flow channel in the interior of the straight cooling plate 5 and arranging the overheated zone flow channel 54 at the middle position, heat transfer can be performed with the low-temperature zone flow channel 53, thereby reducing the influence of overheated refrigerant at the end of the flow channel on the highest temperature of the battery pack above, and further improving the temperature uniformity of the battery pack at different positions.

[0055] On this basis, referring to Figure 5 , the two-phase zone flow channel 55 and the overheated zone flow channel 54 are arranged in multiple rows from inside to outside, and the spacing between the two adjacent overheated zone flow channels 54 is smaller than the spacing between the two adjacent two-phase zone flow channels 55.

[0056] It can be seen that since the spacing between the two adjacent overheated zone flow channels 54 is smaller than the spacing between the two adjacent two-phase zone flow channels 55, the flow area of the two-phase zone flow channel 55 is greater than that of the overheated zone flow channel 54, thereby ensuring the temperature uniformity between the two-phase zone flow channel 55 and the overheated zone flow channel 54.

[0057] Exemplarily, the heat exchange area of the overheated zone flow channel 54 and the two-phase zone flow channel 55 can be adjusted as needed to adapt to different straight cooling requirements. Therefore, the specific structure and arrangement of the flow channel can be selected as needed, and the embodiment is not limited in detail herein.

[0058] Exemplarily, the flow channel can be integrally formed by punching or extrusion processing, and other processing methods can also be used, which are not limited in the embodiment.

[0059] In one case of the embodiment, referring to Figure 5 , the overheat area flow channels 54 are arranged at equal intervals from inside to outside, and the plurality of overheat area flow channels 54 converge and simultaneously communicate with the liquid outlet 52 of the direct cooling plate 5.

[0060] As can be seen, by using the equal interval arrangement of the overheat area flow channels 54, the heat transfer efficiency is optimized, and the temperature balance of different areas of the battery pack is ensured, avoiding local overheating, and significantly improving the overall performance and safety factor of the battery pack.

[0061] In actual operation of the embodiment, referring to Figure 5 , the flow channels are symmetrically arranged in two groups relative to the center axis of the direct cooling plate 5, the low-temperature area flow channels 53 of the two groups of flow channels simultaneously communicate with the liquid inlet 51, and the direct cooling plate 5 is provided with two liquid outlets 52 and is configured to be connected to the overheat area flow channels 54 of the two groups of flow channels one by one.

[0062] It can be known that by symmetrically arranging two groups of flow channels on the direct cooling plate 5, the flow channels can be evenly distributed on the direct cooling plate 5, and the flow channel system is symmetrically distributed based on the center axis of the direct cooling plate 5, which helps to improve the flow efficiency of the refrigerant in the direct cooling plate 5. The refrigerant is supplied to the two groups of flow channels through the liquid inlet 51, thereby ensuring uniform distribution of the refrigerant and ensuring 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.

[0063] Exemplarily, the flow channel can also be arranged in different distribution patterns on the direct cooling plate 5 as needed, and the specific structure and function thereof can be selected as needed, which are not limited in the embodiment.

[0064] In one case of the embodiment, referring to Figure 3 and Figure 4 , the direct cooling plate 5 includes a plate body 56, a cover body 57 attached to the plate body 56, and a direct current joint 58 mounted to the plate body 56 and simultaneously communicating with the liquid inlet 51 and the liquid outlet 52, and the flow channel is formed between the plate body 56 and the cover body 57.

[0065] It can be known that by setting the cover body 57, the plate body 56 is facilitated to cooperate, thereby forming a flow channel between the two, ensuring the sealing of the flow channel system, preventing leakage of the refrigerant or working fluid, and the direct current joint 58 simultaneously communicates with the liquid inlet 51 and the liquid outlet 52, ensuring the effective flow of the refrigerant. At the same time, the combination structure of the plate body 56 and the cover body 57 also enhances the structural stability of the entire direct cooling plate 5, which is convenient to open for maintenance when needed.

[0066] Exemplarily, the cover body 57 can be fixed to the plate body 56 by welding, bonding, riveting or the like, and thus the specific mounting manner is not a restrictive provision of the embodiment.

[0067] In another case of the embodiment, referring to Figure 3 and Figure 4 , the module pressing strip 59 is mounted on the side of the cover body 57 away from the plate body 56 and configured to limit the battery on the plate body 56.

[0068] It can be known that the direct-current joint 58 is in communication with the liquid inlet 51 and the liquid outlet 52, so as to facilitate the direct cooling plate to be connected to the pipeline system, and the module pressing strip 59 is mounted on the side of the cover body 57 away from the plate body 56, which mainly functions to position and limit the battery pack above the cover body 57, so as to facilitate the battery pack to be mounted on the direct cooling plate for temperature regulation.

[0069] In actual operation of the embodiment, referring to Figure 1 and Figure 2 , two direct cooling plates are connected in series in the first circuit K1, and three direct cooling plates are connected in series in the second circuit K2.

[0070] It can be known that by setting different numbers of direct cooling plates in the first and second circuits K2, the flow of refrigerant is ensured to be distributed as needed between different circuits, and the uniformity of the direct cooling pipeline is ensured.

[0071] Exemplarily, the first circuit K1 and the second circuit K2 correspond to the direct cooling plates, which can be adjusted and selected as needed, and the setting manner in the embodiment is only a preferred one, and is not a restrictive provision of the embodiment.

[0072] In actual operation of the embodiment, referring to Figure 6 and Figure 7 , the flow guide plate 4 comprises a support frame body 41, a flow guide joint 42 provided on the support frame body 41, a liquid inlet side pipe 43 provided on one end of the support frame body 41 and in communication with an outlet end of the flow guide joint 42, a plurality of liquid inlet flow channels 44 in communication with the liquid inlet side pipe 43, a liquid outlet side pipe 45 provided on the other end of the support frame body 41 and in communication with each liquid inlet flow channel 44, and a plurality of liquid outlet flow channels 46 in communication with the liquid outlet side pipe 45, one end of the liquid outlet flow channel 46 away from the liquid outlet side pipe 45 being in communication with an inlet end of the flow guide joint 42.

[0073] In one case of the embodiment, referring to Figure 6 and Figure 7 , the sum of the heat exchange areas of the liquid inlet flow channels 44 and the liquid outlet flow channels 46 of each flow guide plate 4 is less than the total heat exchange area of the direct cooling plate 5.

[0074] 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.

[0075] In one embodiment, reference is made to... Figure 1 and Figure 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.

[0076] For example, 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.

[0077] This embodiment also provides an energy storage device, see reference. Figure 8 This includes: the direct cooling piping system as described above, and the battery pack disposed on each direct cooling plate.

[0078] 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.

[0079] 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.

[0080] The above examples mainly illustrate the direct cooling pipeline system of the present application and the energy storage device comprising the same. Although only some of the embodiments of the present application are described, it should be understood by those skilled in the art that the present application can be implemented in many other forms without departing from the spirit and scope of the present application. Therefore, the examples and embodiments shown are considered to be illustrative rather than restrictive, and the present application can encompass various modifications and alternatives without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A direct-cooled line system, characterized in that The application relates to a refrigerant circuit, comprising: a first circuit comprising a first branch and a second branch arranged in parallel, one of the first branch and the second branch being provided with a control valve, and the other being provided with a first temperature sensor and at least one straight cooling plate in sequence along the refrigerant flow direction; a second circuit comprising a second temperature sensor and at least one straight cooling plate in sequence along the refrigerant flow direction; the first circuit and the second circuit are connected in series and configured to be connected to a refrigerant total inlet and a refrigerant total outlet respectively; the first temperature sensor and the second temperature sensor are both connected to the control valve and configured to adjust the opening degree 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 In the refrigerant flow direction, the first straight cooling plate in the first circuit and the first straight cooling plate in the second circuit are both configured as a flow guide plate, and the rest of the straight cooling plates are configured as straight cooling plates with flow channels inside, and the heat exchange area of the flow guide plate is smaller than the total heat exchange area of the flow channels inside the straight cooling plate.

3. A direct cooling line system according to claim 2, characterized in that The flow channels comprise low-temperature zone flow channels, superheated zone flow channels and two-phase zone flow channels arranged outward in sequence from the middle position of the straight cooling plate, one end of the low-temperature zone flow channels is communicated with the liquid inlet of the straight cooling plate, the other end is communicated with the two-phase zone flow channels, and the two ends of the superheated zone flow channels are respectively communicated with the liquid outlet of the straight cooling plate and the end of the two-phase zone flow channels away from the low-temperature zone flow channels.

4. A direct cooling line system according to claim 3, characterized in that The two-phase zone flow channels and the superheated zone flow channels are both arranged in multiple columns from inside to outside in parallel, and the spacing between the two adjacent superheated zone flow channels is smaller than the spacing between the two adjacent two-phase zone flow channels.

5. A direct cooling line system according to claim 3, wherein The superheated zone flow channels are arranged at equal intervals from inside to outside, and a plurality of superheated zone flow channels are simultaneously communicated with the liquid outlet of the straight cooling plate after converging.

6. A direct cooling line system according to claim 3, characterized in that The flow channels are symmetrically arranged in two groups relative to the central axis of the straight cooling plate, the low-temperature zone flow channels of the two groups of flow channels are simultaneously communicated with the liquid inlet, the straight cooling plate is provided with two liquid outlets and is configured to be connected to the superheated zone flow channels of the two groups of flow channels in a one-to-one manner.

7. A direct cooling line system according to any of claims 3-6, characterized in that The straight cooling plate comprises a plate body, a cover body attached to the plate body, and a direct-current joint mounted on the plate body and simultaneously communicated with the liquid inlet and the liquid outlet, and the flow channels are formed between the plate body and the cover body.

8. A direct cooling line system according to claim 7, characterized in that Further comprising: a module pressing strip mounted on the side of the plate body away from the flow channels and configured to limit the two ends of the battery on the plate body.

9. A direct cooling line system according to claim 1, characterized in that Two straight cooling plates are connected in sequence in the first circuit, and three straight cooling plates are connected in sequence in the second circuit.

10. A direct cooling line system according to claim 2, wherein The flow guide plate comprises a support frame, a flow guide joint arranged on the support frame, a liquid inlet side pipe arranged at one end of the support frame and communicated with the outlet end of the flow guide joint, a plurality of liquid inlet flow channels communicated with the liquid inlet side pipe, a liquid outlet side pipe arranged at the other end of the support frame and communicated with each of the liquid inlet flow channels, and a plurality of liquid outlet flow channels communicated with the liquid outlet side pipe, and one end of the liquid outlet flow channels away from the liquid outlet side pipe is communicated with the inlet end of the flow guide joint.

11. A direct cooling line system according to claim 2, characterized in that The sum of the heat exchange areas of the liquid inlet flow channels and the liquid outlet flow channels of each flow guide plate is smaller than the total heat exchange area of the straight cooling plate.

12. A direct cooling line system according to claim 1, characterized in that The control valve is configured as an electronic expansion valve, and / or the first temperature sensor and the second temperature sensor are each configured as a thermocouple temperature sensor.

13. An energy storage device, characterized by, The direct cooling pipeline system as claimed in any one of claims 1-12, and a battery pack arranged on each of the direct cooling plate members.

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