Thermal management system of energy storage equipment

Abstract

The invention provides an energy storage equipment thermal management system, and relates to the technical field of battery thermal management, the energy storage equipment thermal management system comprises a host, a plurality of battery packs and a pipeline assembly, the host is provided with a first liquid inlet and a first liquid outlet; each battery pack comprises a heat exchange box body and a battery, a heat exchange flow channel is formed in the heat exchange box body, and the heat exchange flow channel is provided with a second liquid inlet and a second liquid outlet; the pipeline assembly communicates with the first liquid outlet and each second liquid inlet and communicates with the first liquid inlet and each second liquid outlet, and the flowing distances of heat exchange media flowing through all the heat exchange runners in the pipeline assembly are the same. According to the heat management system of the energy storage equipment, the heat exchange medium flowing through each heat exchange runner can have the same flow speed and flow, so that the refrigerating or heating effect of the heat exchange medium on each battery is consistent, the energy storage capacity of the energy storage equipment is improved, and the service life of the energy storage equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of battery thermal management, and in particular to a thermal management system for energy storage equipment. Background Art

[0002] In the related art, energy storage equipment usually arranges multiple battery packs for charging and discharging as needed. For the thermal management of the battery pack, pipelines are often used to transport heat exchange media to cool or heat the batteries in the battery pack, so that the batteries work in the optimal operating temperature range, thereby completing temperature control. However, the pipeline system design in the prior art generally only plays the role of carrying and transporting the heat exchange medium, and the flow rate, flow rate and temperature of the heat exchange medium flowing through each battery pack are different, which leads to differences in the degree of cooling or heating of each battery pack, and the cooling or heating effect is not balanced. This may make the working efficiency and working life of each battery pack different, thereby reducing the energy storage capacity and service life of the energy storage equipment, and adversely affecting its overall working stability. Summary of the invention

[0003] The technical problem solved by the present invention is that the existing thermal management system has an uneven cooling or heating effect on each battery pack.

[0004] In order to solve the above problems, the present invention provides a thermal management system for energy storage equipment, including a main unit, a plurality of battery packs and a pipeline assembly, wherein the main unit has a first liquid inlet and a first liquid outlet, and the main unit is used to provide a heat exchange medium and drive the heat exchange medium to flow; each of the battery packs includes a heat exchange box and a battery encapsulated in the heat exchange box, a heat exchange channel is formed in the heat exchange box, and the heat exchange channel has a second liquid inlet and a second liquid outlet; the pipeline assembly connects the first liquid outlet and each of the second liquid inlets and connects the first liquid inlet and each of the second liquid outlets, and the heat exchange medium flowing through each of the heat exchange channels has the same flow distance in the pipeline assembly.

[0005] Optionally, multiple battery packs are arranged in sequence along the first direction to form a cluster; the pipeline assembly includes a first liquid inlet pipe, a first liquid return pipe, a second liquid inlet pipe and a second liquid return pipe, each of the second liquid inlets of a cluster of battery packs is connected to the same second liquid inlet pipe through a first liquid inlet pipe, multiple first liquid inlet pipes are arranged in parallel, each of the second liquid outlets of a cluster of battery packs is connected to the same second liquid return pipe through a first liquid return pipe, multiple first liquid return pipes are arranged in parallel, the second liquid inlet pipe is connected to the first liquid outlet, and the second liquid return pipe is connected to the first liquid inlet; the second liquid inlet pipe and the second liquid return pipe are both extended along the first direction, and the heat exchange medium in the two pipelines flows in the same direction.

[0006] Optionally, multiple clusters of battery packs are arranged in sequence along the second direction to form a row, and the first direction is perpendicular to the second direction; within a row of battery packs, multiple second liquid inlet pipes and multiple clusters of battery packs are alternately arranged in sequence along the second direction, and multiple second liquid return pipes and multiple clusters of battery packs are alternately arranged in sequence along the second direction; the pipeline assembly also includes a third liquid inlet pipe and a third liquid return pipe, each of the second liquid inlet pipes connected to each cluster of battery packs in a row of battery packs is connected to the same third liquid inlet pipe, each of the second liquid return pipes connected to each cluster of battery packs in a row of battery packs is connected to the same third liquid return pipe, the third liquid inlet pipe is connected to the first liquid outlet, and the third liquid return pipe is connected to the first liquid inlet; the third liquid inlet pipe and the third liquid return pipe are both extended along the second direction, and the heat exchange medium in the two pipelines flows in the same direction.

[0007] Optionally, a plurality of columns of the battery packs are arranged in sequence along a third direction to form a group, and the first direction, the second direction and the third direction are perpendicular to each other; the pipeline assembly also includes a fourth liquid inlet pipe and a fourth liquid return pipe, each of the third liquid inlet pipes connected to each column of the battery packs in a group of the battery packs is connected to the same fourth liquid inlet pipe, and each of the third liquid return pipes connected to each column of the battery packs in a group of the battery packs is connected to the same fourth liquid return pipe, the fourth liquid inlet pipe is connected to the first liquid outlet, and the fourth liquid return pipe is connected to the first liquid inlet; the fourth liquid inlet pipe and the fourth liquid return pipe are both extended along the third direction, and the heat exchange medium in the two pipelines flows in the same direction.

[0008] Optionally, the pipe lengths and inner diameters of the plurality of first liquid inlet pipes are the same, and the pipe lengths and inner diameters of the plurality of first liquid return pipes are the same.

[0009] Optionally, the pipe lengths and pipe inner diameters of the plurality of second liquid inlet pipes are the same, and the pipe lengths and pipe inner diameters of the plurality of second liquid return pipes are the same.

[0010] Optionally, a flow control valve is provided at the connection between the second liquid inlet pipe and the third liquid inlet pipe; or, a flow control valve is provided at the connection between the second liquid return pipe and the third liquid return pipe.

[0011] Optionally, an exhaust valve is provided at the highest point of the pipeline assembly in the vertical direction.

[0012] Optionally, a drain valve is provided at the lowest point of the pipeline assembly in the vertical direction.

[0013] Optionally, the host includes a cabinet and a liquid pump, a heating component and a refrigeration component arranged in the cabinet; a host pipeline connecting the first liquid inlet and the first liquid outlet is formed in the cabinet, the liquid pump is arranged on the host pipeline to drive the flow of heat exchange medium in the host pipeline, and the heating component and the refrigeration component are arranged in the cabinet to heat or cool the heat exchange medium in the host pipeline respectively.

[0014] The energy storage device thermal management system of the present invention can make the heat exchange medium flowing through each heat exchange channel have the same flow distance in the pipeline assembly by designing the pipeline assembly. Since the resistance loss of the fluid passing through each meter of the pipeline is nearly equal, the heat exchange medium flowing through each heat exchange channel experiences the same along-the-way resistance and local resistance. The heat exchange medium in each heat exchange channel has the same flow rate and flow rate, so that the heat exchange medium has the same cooling or heating effect on each battery, ensuring that each battery operates under the same and appropriate temperature conditions, thereby improving the service life and energy storage capacity of the battery, and the energy storage device has high working stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the layout structure of a thermal management system for energy storage equipment in one direction according to an embodiment of the present invention;

[0016] Figure 2 for Figure 1 Schematic diagram of the layout structure of the thermal management system of the energy storage device in another direction.

[0017] Description of reference numerals:

[0018] 10-main unit; 20-battery pack; 31-first liquid inlet pipe; 32-first liquid return pipe; 33-second liquid inlet pipe; 34-second liquid return pipe; 35-third liquid inlet pipe; 36-third liquid return pipe; 37-fourth liquid inlet pipe; 38-fourth liquid return pipe; 41-liquid inlet main pipe; 42-liquid return main pipe; 50-flow control valve; 60-exhaust valve; 70-drain valve. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] It should be noted that in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] The thermal management system of energy storage equipment used in the prior art has the problem of uneven cooling or heating effect for each battery pack.

[0023] See also Figure 1 and Figure 2 In order to solve the above technical problems, an embodiment of the present invention provides a thermal management system for energy storage equipment, including a host 10, a battery pack 20 and a pipeline assembly.

[0024] Among them, the host 10 has a first liquid inlet and a first liquid outlet, and the host 10 is used to provide a heat exchange medium and drive the heat exchange medium to flow; there can be multiple battery packs 20, each of which includes a heat exchange box and a battery encapsulated in the heat exchange box, and a heat exchange channel is formed in the heat exchange box, and the heat exchange channel has a second liquid inlet and a second liquid outlet; the pipeline assembly connects the first liquid outlet and each second liquid inlet and connects the first liquid inlet and each second liquid outlet, and the heat exchange medium flowing through each heat exchange channel has the same flow distance in the pipeline assembly. In this way, the host 10 drives the heat exchange medium of suitable temperature to flow from the first liquid outlet to the pipeline assembly. The heat exchange medium generates heat exchange with the battery in the heat exchange box while flowing through the heat exchange flow channel to cool or heat the battery so that the battery works within the optimal temperature range. Then, the heat exchange medium flows back to the host 10 from the first liquid inlet through the pipeline assembly. The host 10 can heat or cool the refluxed heat exchange medium to a suitable initial temperature and then drive the heat exchange medium to flow out from the first liquid outlet. The heat exchange medium circulates back and forth to realize the continuous thermal management process of the battery.

[0025] The energy storage device thermal management system of the embodiment of the present invention designs the pipeline assembly to keep the flow distance of the heat exchange medium flowing through each heat exchange channel at the same level in the pipeline assembly. Since the resistance loss of the fluid passing through each meter of the pipeline is approximately equal, the heat exchange medium flowing through each heat exchange channel experiences the same along-the-way resistance and local resistance. The heat exchange medium in each heat exchange channel has the same flow rate and flow rate, thereby making the cooling or heating effect of the heat exchange medium on each battery consistent, ensuring that each battery operates under the same and appropriate temperature conditions, thereby improving the service life and energy storage capacity of the battery, and the energy storage device has high working stability.

[0026] More specifically, the host 10 may include a cabinet, and the first liquid inlet and the first liquid outlet are both arranged on the surface of the cabinet, so as to facilitate the connection of the pipeline assembly. A host 10 pipeline is formed in the cabinet, and the two ends are respectively connected to the first liquid inlet and the first liquid outlet. The host 10 may also include components such as a liquid pump, a heating component, and a refrigeration component. The liquid pump is arranged on the pipeline of the host 10 to drive the heat exchange medium in the pipeline of the host 10 to flow. The heating component and the refrigeration component may be arranged on the outer wall or periphery of the pipeline of the host 10, so as to heat or cool the heat exchange medium in the pipeline of the host 10 respectively, so that the heat exchange medium reaches a preset suitable temperature. For example, in some embodiments, the heating component and the refrigeration component may be a semiconductor refrigeration sheet, the hot end of the semiconductor refrigeration sheet is attached to one side of the pipeline of the host 10 to form a heating component, and the cold end of the semiconductor refrigeration sheet is attached to the other side of the pipeline of the host 10 to form a heating component. When in use, the heating component or the refrigeration component may be controlled to work with the corresponding semiconductor refrigeration sheet as needed to achieve the heating or cooling requirements of the heat exchange medium. Alternatively, in other embodiments, the heating component and the cooling component may also be a combination of an electric heater and an evaporative cooler or a combination of other heating and cooling equipment. The specific structural form is not limited here, and it can meet the heating and cooling requirements of the heat exchange medium.

[0027] There are multiple battery packs 20. Depending on the number and arrangement structure of the battery packs 20, the pipeline assembly needs to be designed accordingly. For ease of understanding and explanation, in the illustrated embodiment, the direction indicated by the Y axis is defined as the first direction. The Y axis can represent the vertical direction, that is, the up and down position, and the positive direction of the Y axis (that is, the direction of the arrow of the Y axis) represents the up, and the negative direction of the Y axis represents the down; the direction indicated by the X axis is defined as the second direction. The X axis can represent the horizontal direction and is specified as the left and right position, and the positive direction of the X axis (that is, the direction of the arrow of the X axis) represents the left side, and the negative direction of the X axis represents the right side; the direction indicated by the Z axis is defined as the third direction. The Z axis can represent the front and back direction, and the positive direction of the Z axis (that is, the direction of the arrow of the Z axis) represents the back, and the negative direction of the Z axis represents the front. It should be noted that the meaning of the aforementioned Y axis, X axis and Z axis is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0028] In the illustrated embodiment, multiple battery packs 20 are sequentially arranged in a first direction to form a cluster, multiple clusters of battery packs 20 are sequentially arranged in a second direction to form a row, multiple rows of battery packs 20 are sequentially arranged in a third direction to form a group, and the first direction, the second direction, and the third direction are perpendicular to each other. The pipeline assembly may include a first liquid inlet pipe 31, a first liquid return pipe 32, a second liquid inlet pipe 33, a second liquid return pipe 34, a third liquid inlet pipe 35, a third liquid return pipe 36, a fourth liquid inlet pipe 37, and a fourth liquid return pipe 38.

[0029] For each cluster of battery packs 20: each second liquid inlet of a cluster of battery packs 20 is connected to the same second liquid inlet pipe 33 through a first liquid inlet pipe 31, and multiple first liquid inlet pipes 31 are arranged in parallel; each second liquid outlet of a cluster of battery packs 20 is connected to the same second liquid return pipe 34 through a first liquid return pipe 32, and multiple first liquid return pipes 32 are arranged in parallel. The heat exchange medium is divided into multiple first liquid inlet pipes 31 in the second liquid inlet pipe 33 corresponding to each cluster of battery packs 20, flows through the heat exchange flow channels of each heat exchange box, and then flows into the second liquid return pipe 34 through multiple first liquid return pipes 32. The second liquid inlet pipe 33 and the second liquid return pipe 34 are both extended in the first direction, and the heat exchange medium in the two pipes flows in the same direction, for example, the heat exchange medium can flow from bottom to top along the arrow direction on the second liquid inlet pipe 33 and the second liquid return pipe 34 shown in the figure. In this way, the second liquid inlet pipe 33 and the second liquid return pipe 34 are arranged in parallel and their extension direction is consistent with the arrangement direction of a cluster of multiple battery packs 20, so that the second liquid inlet of each battery pack 20 is connected to the same second liquid inlet pipe 33 and the second liquid outlet of each battery pack 20 is connected to the same second liquid return pipe 34; at the same time, multiple first liquid inlet pipes 31 are arranged in parallel and multiple first liquid return pipes 32 are arranged in parallel, so that the lengths of multiple first liquid inlet pipes 31 corresponding to a cluster of battery packs 20 are the same, and the lengths of multiple first liquid return pipes 32 are the same, so that the heat exchange medium flowing through each heat exchange channel has the same flow distance from the connection between the first liquid inlet pipe 31 and the second liquid inlet pipe 33 to the connection between the first liquid return pipe 32 and the second liquid return pipe 34. Since the heat exchange medium in the second liquid inlet pipe 33 and the second liquid return pipe 34 flows in the same direction, both flowing from bottom to top, it is not difficult to understand from the diagram that in the same battery pack 20, for the heat exchange medium flowing through each heat exchange flow channel, the sum of the flow distance of the heat exchange medium in the second liquid inlet pipe 33 and the flow distance in the second liquid return pipe 34 is equal. In other words, the heat exchange medium flowing through each heat exchange flow channel in a battery pack 20 has the same flow distance in the pipeline assembly.

[0030] For each column of battery packs 20: each second liquid inlet pipe 33 connected to each cluster of battery packs 20 in a column of battery packs 20 is connected to the same third liquid inlet pipe 35, and each second liquid return pipe 34 connected to each cluster of battery packs 20 in a column of battery packs 20 is connected to the same third liquid return pipe 36. The heat exchange medium is divided into multiple second liquid inlet pipes 33 in the third liquid inlet pipe 35 corresponding to each column of battery packs 20, flows through the heat exchange flow channels of each cluster of battery packs 20, and then flows into the third liquid return pipe 36 through multiple second liquid return pipes 34. The third liquid inlet pipe 35 and the third liquid return pipe 36 are both extended in the second direction, and the heat exchange medium in the two pipes flows in the same direction. For example, the heat exchange medium can flow from right to left along the arrow direction on the third liquid inlet pipe 35 and the third liquid return pipe 36 shown in the figure. In this way, the third liquid inlet pipe 35 and the third liquid return pipe 36 are arranged in parallel and their extension directions are consistent with the arrangement direction of multiple clusters of battery packs 20 in a row, and multiple second liquid inlet pipes 33 are arranged perpendicular to the third liquid inlet pipe 35, and multiple second liquid return pipes 34 are arranged perpendicular to the third liquid return pipe 36, so that the heat exchange medium flowing through each cluster of battery packs 20 has the same flow distance from the connection between the second liquid inlet pipe 33 and the third liquid inlet pipe 35 to the connection between the second liquid return pipe 34 and the third liquid return pipe 36, that is, the relative distance between the third liquid inlet pipe 35 and the third liquid return pipe 36; because the heat exchange medium in the pipelines of the third liquid inlet pipe 35 and the third liquid return pipe 36 flows in the same direction, both flowing from right to left, that is, in the same column of battery packs 20, for the heat exchange medium flowing through each cluster of battery packs 20, the sum of the flow distance of the heat exchange medium in the third liquid inlet pipe 35 and the flow distance in the third liquid return pipe 36 is equal. That is to say, the heat exchange medium flowing through each heat exchange channel in a row of battery packs 20 has the same flow distance in the pipeline assembly.

[0031] For a group of battery packs 20: each third liquid inlet pipe 35 connected to each column of battery packs 20 in a group of battery packs 20 is connected to the same fourth liquid inlet pipe 37, each third liquid return pipe 36 connected to each column of battery packs 20 in a group of battery packs 20 is connected to the same fourth liquid return pipe 38, the fourth liquid inlet pipe 37 is connected to the first liquid outlet, and the fourth liquid return pipe 38 is connected to the first liquid inlet. The heat exchange medium is divided into multiple third liquid inlet pipes 35 in the fourth liquid inlet pipe 37, flows through the heat exchange flow channels of each column of battery packs 20, and then flows into the fourth liquid return pipe 38 through multiple third liquid return pipes 36. The fourth liquid inlet pipe 37 and the fourth liquid return pipe 38 are both extended along the third direction, and the heat exchange medium in the two pipes flows in the same direction. For example, the heat exchange medium can flow from back to front along the arrow direction on the fourth liquid inlet pipe 37 and the fourth liquid return pipe 38 shown in the figure. In this way, the fourth liquid inlet pipe 37 and the fourth liquid return pipe 38 are arranged in parallel and their extension directions are consistent with the arrangement direction of the multiple columns of battery packs 20 in a group, and the multiple third liquid inlet pipes 35 are arranged perpendicular to the fourth liquid inlet pipe 37, and the multiple third liquid return pipes 36 are arranged perpendicular to the fourth liquid return pipe 38, so that the heat exchange medium flowing through each column of battery packs 20 has the same flow distance from the connection between the third liquid inlet pipe 35 and the fourth liquid inlet pipe 37 to the connection between the third liquid return pipe 36 and the fourth liquid return pipe 38, that is, the relative distance between the fourth liquid inlet pipe 37 and the fourth liquid return pipe 38; because the heat exchange medium in the pipelines of the fourth liquid inlet pipe 37 and the fourth liquid return pipe 38 flows in the same direction, both flow from front to back, that is, in a group of battery packs 20, the sum of the flow distance of the heat exchange medium in the fourth liquid inlet pipe 37 and the flow distance in the fourth liquid return pipe 38 is equal. In other words, the heat exchange medium flowing through each heat exchange flow channel in a group of battery packs 20 has the same flow distance in the pipeline assembly.

[0032] like Figure 1 and Figure 2 In the illustrated embodiment, eight battery packs 20 form a cluster, five battery packs 20 form a column, and three columns of battery packs 20 form a group, and the host 10 is disposed on the left side of the entire group of battery packs 20. The second liquid inlet pipe 33 and the second liquid return pipe 34 corresponding to each cluster of battery packs 20 are respectively disposed on the left and right sides of the cluster of battery packs 20, the third liquid inlet pipe 35 and the third liquid return pipe 36 corresponding to each column of battery packs 20 are respectively disposed on the upper and lower sides of the column of battery packs 20, and the fourth liquid inlet pipe 37 and the fourth liquid return pipe 38 are respectively disposed on the left and right sides of the group of battery packs 20. The first liquid inlet pipe 31 and the first liquid return pipe 32 are both extended along the second direction, that is, they are respectively perpendicular to the correspondingly connected second liquid inlet pipe 33 and the second liquid return pipe 34. In this way, the first liquid inlet pipe 31 can be made to have the shortest length when connecting the second liquid inlet pipe 33 and the second liquid inlet, and the first liquid return pipe 32 can be made to have the shortest length when connecting the second liquid return pipe 34 and the second liquid outlet, thereby achieving the effect of saving materials and reducing the cost of pipeline layout.

[0033] It can be understood that in other embodiments, the number of battery packs 20 in each cluster, the number of clusters of battery packs 20 in each column, and the number of columns of battery packs 20 in each group can also be other numbers; the first liquid inlet pipe 31 and the first liquid return pipe 32 can also be arranged at other angles to the second liquid inlet pipe 33 and the second liquid return pipe 34, as long as the first liquid inlet pipe 31 and the first liquid return pipe 32 in the same cluster of battery packs 20 are arranged in parallel; the second liquid inlet pipe 33 and the second liquid return pipe 34 corresponding to each cluster of battery packs 20 can also be respectively arranged on the same side or adjacent side of the cluster of battery packs 20, and the third liquid inlet pipe 35 and the third liquid return pipe 36 corresponding to each column of battery packs 20 can also be respectively arranged on the same side or adjacent side of the column of battery packs 20. Under the condition that their respective extension directions are determined, the specific setting positions are not limited, which is convenient for the layout and connection of pipelines.

[0034] It should be noted that, since the extension directions of the fourth liquid inlet pipe 37 and the fourth liquid return pipe 38 are fixed, in order to facilitate the connection between the fourth liquid inlet pipe 37 and the first liquid outlet and the connection between the fourth liquid return pipe 38 and the first liquid inlet, the pipeline assembly also includes a liquid inlet main pipe 41 and a liquid return main pipe 42. The liquid inlet main pipe 41 connects the fourth liquid inlet pipe 37 and the first liquid outlet, and the liquid return main pipe 42 connects the fourth liquid return pipe 38 and the first liquid inlet. The liquid inlet main pipe 41 and the liquid return main pipe 42 have no effect on the flow distance of the heat exchange medium flowing through each heat exchange channel in the pipeline assembly. The structure and arrangement position of the liquid inlet main pipe 41 and the liquid return main pipe 42 are not limited, and can be a pipe structure that bypasses the battery pack 20 and has multiple bends as shown in the illustrated embodiment; or, depending on the setting position of the host 10 and the setting positions of the first liquid inlet port and the first liquid return port on the host 10, only the liquid inlet main pipe 41 can be provided to connect the fourth liquid inlet pipe 37 and the first liquid outlet, and the first liquid return pipe 32 is directly connected to the first liquid outlet; or, only the liquid return main pipe 42 can be provided; etc.

[0035] It can be understood that in some embodiments, the battery pack 20 may be provided with only one cluster, in which case the pipeline assembly may include a plurality of first liquid inlet pipes 31, a plurality of first liquid return pipes 32, a second liquid inlet pipe 33 and a second liquid return pipe 34, and the first liquid inlet pipe 31, the first liquid return pipe 32, the second liquid inlet pipe 33 and the second liquid return pipe 34 are designed corresponding to a cluster of battery packs 20 in the aforementioned embodiments, so that the heat exchange medium flowing through each heat exchange channel has the same flow distance in the pipeline assembly; the second liquid inlet pipe 33 is directly connected to the first liquid outlet or is connected by setting a liquid inlet main pipe 41, and the second liquid return pipe 34 is directly connected to the first liquid inlet or is connected by setting a liquid return main pipe 42. Alternatively, in some other embodiments, the battery pack 20 may be provided with only one row, in which case the pipeline assembly may include a plurality of first liquid inlet pipes 31, a plurality of first liquid return pipes 32, a plurality of second liquid inlet pipes 33, a plurality of second liquid return pipes 34, a third liquid inlet pipe 35 and a third liquid return pipe 36, and each pipeline is designed corresponding to a row of battery packs 20 in the aforementioned embodiment, so that the heat exchange medium flowing through each heat exchange channel has the same flow distance in the pipeline assembly; the third liquid inlet pipe 35 is directly connected to the first liquid outlet or is connected by setting a liquid inlet main pipe 41, and the third liquid return pipe 36 is directly connected to the first liquid inlet or is connected by setting a liquid return main pipe 42.

[0036] Preferably, when the battery packs 20 are provided with multiple clusters to form a row or a group, the pipe lengths and inner diameters of the multiple first liquid inlet pipes 31 are the same, and the pipe lengths and inner diameters of the multiple first liquid return pipes 32 are the same. This can avoid the different sizes of the first liquid inlet pipes 31 and the first liquid return pipes 32 corresponding to the battery packs 20 in different clusters. That is, for all the battery packs 20 in a row or a group, the heat exchange medium flowing through the heat exchange flow channel has the same flow distance from the connection between the first liquid inlet pipe 31 and the second liquid inlet pipe 33 corresponding to each battery pack 20 to the connection between the first liquid return pipe 32 and the second liquid return pipe 34, further improving the consistency and stability of the flow rate of the heat exchange medium in each heat exchange flow channel. Correspondingly, when the battery pack 20 is provided with multiple columns to form a group, the pipe lengths and inner diameters of the multiple second liquid inlet pipes 33 are the same, and the pipe lengths and inner diameters of the multiple second liquid return pipes 34 are the same, so as to avoid the different sizes of the second liquid inlet pipes 33 and the second liquid return pipes 34 corresponding to the battery packs 20 in different columns, thereby affecting the consistency and stability of the flow rate of the heat exchange medium in the heat exchange flow channels of the battery packs 20 in different columns.

[0037] Preferably, the heat exchange medium can be a mixture of one or more of water, ethylene glycol and propylene glycol. Each pipeline of the pipeline assembly can adopt a hard metal pipe structure, the overall structure has high strength, is not easy to be damaged, and the pipeline is not easy to deform, which is conducive to the stable flow of the heat exchange medium. The pipelines can be detachably connected by quick-connect connectors, which is convenient for assembly and disassembly, and is convenient for later maintenance and replacement of the pipelines.

[0038] In some embodiments, when the battery pack 20 is provided with multiple clusters to form a row or a group, a flow control valve 50 is provided at the connection between the second liquid inlet pipe 33 and the third liquid inlet pipe 35; or, a flow control valve 50 is provided at the connection between the second liquid return pipe 34 and the third liquid return pipe 36. In this way, by controlling the on-off of the flow control valve 50, the heat exchange medium can be selectively controlled to flow into or prohibited from flowing into the corresponding battery pack 20. The output power of the energy storage device is generally controlled by controlling the number of discharge clusters of the battery pack 20. For example, when the energy storage device needs to output high power, all the battery packs 20 are in a working discharge state. At this time, each flow control valve 50 can be controlled to open, and the heat exchange medium cools or heats all the battery packs 20; when the energy storage device needs to output low power, the battery packs 20 of some clusters work and discharge. At this time, the flow control valve 50 corresponding to the corresponding cluster battery pack 20 in the working state can be controlled to open, and the heat exchange medium only cools or heats the battery pack 20 in the working state, thereby achieving energy saving and load reduction for the host 10.

[0039] Furthermore, the pipeline assembly is provided with an exhaust valve 60 at the highest point in the vertical direction, and a drain valve 70 at the lowest point in the vertical direction. The exhaust valve 60 can exhaust according to the gas pressure in the pipeline, and the drain valve 70 can drain according to the liquid pressure in the pipeline. In the illustrated embodiment, the exhaust valve 60 is provided on the third liquid return pipe 36, and the drain valve 70 is provided on the third liquid inlet pipe 35. When the gas accumulated in the pipeline of the pipeline assembly reaches a certain pressure or a filling operation is required, the valve of the exhaust valve 60 can be opened to release the accumulated gas; when the liquid pressure in the pipeline of the pipeline assembly is too high or a drain operation is required, the valve of the drain valve 70 can be opened to discharge a certain volume of heat exchange medium. The provision of the exhaust valve 60 and the drain valve 70 is conducive to the reliable operation and maintenance of the heat treatment system.

[0040] When the energy storage device thermal management system of the embodiment of the present invention is in use, the actual temperature in the battery pack 20 can be read by the temperature sensor. When the actual temperature of the battery pack 20 is greater than the maximum threshold value of the optimal operating temperature range (such as 35°C), the liquid pump and the refrigeration component in the control host 10 are started, and the heat exchange medium with a lower temperature flows through each heat exchange channel to cool the battery. At the same time, the actual temperature in the battery pack 20 is continuously detected and maintained within the optimal operating temperature range; when the actual temperature of the battery pack 20 is less than the minimum threshold value of the optimal operating temperature range (such as 10°C), the liquid pump and the heating component in the control host 10 are started, and the heat exchange medium with a higher temperature flows through each heat exchange channel to heat the battery. At the same time, the actual temperature in the battery pack 20 is continuously detected and maintained within the optimal operating temperature range. By designing the pipeline assembly of the energy storage device thermal management system of the embodiment of the present invention, the flow distance of the heat exchange medium flowing through each heat exchange channel in the pipeline assembly is kept the same, so that the heat exchange medium in each heat exchange channel has the same flow rate and flow rate, and the heat exchange medium has the same cooling or heating effect on each battery, ensuring that each battery operates under the same and appropriate temperature conditions, thereby improving the service life of the battery and the working stability of the energy storage device.

[0041] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A thermal management system for energy storage equipment, characterized in that: include: A host (10) having a first liquid inlet and a first liquid outlet, the host (10) being used to provide a heat exchange medium and drive the heat exchange medium to flow; A plurality of battery packs (20), each of the battery packs (20) comprising a heat exchange box and a battery encapsulated in the heat exchange box, a heat exchange channel being formed in the heat exchange box, and the heat exchange channel having a second liquid inlet and a second liquid outlet; The pipeline assembly connects the first liquid outlet and each of the second liquid inlets and connects the first liquid inlet and each of the second liquid outlets, and the heat exchange medium flowing through each of the heat exchange channels has the same flow distance in the pipeline assembly.

2. The energy storage device thermal management system according to claim 1, characterized in that: A plurality of the battery packs (20) are arranged in sequence along a first direction to form a cluster; The pipeline assembly comprises a first liquid inlet pipe (31), a first liquid return pipe (32), a second liquid inlet pipe (33) and a second liquid return pipe (34); each of the second liquid inlets of a cluster of battery packs (20) is connected to the same second liquid inlet pipe (33) via a first liquid inlet pipe (31); a plurality of the first liquid inlet pipes (31) are arranged in parallel; each of the second liquid outlets of a cluster of battery packs (20) is connected to the same second liquid return pipe (34) via a first liquid return pipe (32); a plurality of the first liquid return pipes (32) are arranged in parallel; the second liquid inlet pipe (33) is connected to the first liquid outlet; and the second liquid return pipe (34) is connected to the first liquid inlet; the second liquid inlet pipe (33) and the second liquid return pipe (34) are both extended along the first direction, and the heat exchange medium in the two pipes flows in the same direction.

3. The energy storage device thermal management system according to claim 2, characterized in that: A plurality of clusters of battery packs (20) are sequentially arranged at intervals along a second direction to form a row, and the first direction is perpendicular to the second direction; In a row of the battery packs (20), a plurality of the second liquid inlet pipes (33) and a plurality of clusters of the battery packs (20) are arranged alternately in sequence along a second direction, and a plurality of the second liquid return pipes (34) and a plurality of clusters of the battery packs (20) are arranged alternately in sequence along the second direction; The pipeline assembly also includes a third liquid inlet pipe (35) and a third liquid return pipe (36); each of the second liquid inlet pipes (33) connected to each cluster of battery packs (20) in a row of battery packs (20) is connected to the same third liquid inlet pipe (35); each of the second liquid return pipes (34) connected to each cluster of battery packs (20) in a row of battery packs (20) is connected to the same third liquid return pipe (36); the third liquid inlet pipe (35) is connected to the first liquid outlet, and the third liquid return pipe (36) is connected to the first liquid inlet; the third liquid inlet pipe (35) and the third liquid return pipe (36) are both extended along the second direction, and the heat exchange medium in the two pipes flows in the same direction.

4. The energy storage device thermal management system according to claim 3, characterized in that: A plurality of rows of battery packs (20) are arranged in sequence along a third direction at intervals to form a group, and the first direction, the second direction and the third direction are perpendicular to each other; The pipeline assembly also includes a fourth liquid inlet pipe (37) and a fourth liquid return pipe (38); each of the third liquid inlet pipes (35) connected to each column of the battery packs (20) in a group of the battery packs (20) is connected to the same fourth liquid inlet pipe (37); each of the third liquid return pipes (36) connected to each column of the battery packs (20) in a group of the battery packs (20) is connected to the same fourth liquid return pipe (38); the fourth liquid inlet pipe (37) is connected to the first liquid outlet, and the fourth liquid return pipe (38) is connected to the first liquid inlet; the fourth liquid inlet pipe (37) and the fourth liquid return pipe (38) are both extended along the third direction, and the heat exchange medium in the two pipes flows in the same direction.

5. The thermal management system for energy storage equipment according to any one of claims 2 to 4, characterized in that: The pipe lengths and pipe inner diameters of the plurality of first liquid inlet pipes (31) are the same, and the pipe lengths and pipe inner diameters of the plurality of first liquid return pipes (32) are the same.

6. The energy storage device thermal management system according to claim 3 or 4, characterized in that: The pipe lengths and pipe inner diameters of the plurality of second liquid inlet pipes (33) are the same, and the pipe lengths and pipe inner diameters of the plurality of second liquid return pipes (34) are the same.

7. The energy storage device thermal management system according to claim 3 or 4, characterized in that: A flow control valve (50) is provided at the connection between the second liquid inlet pipe (33) and the third liquid inlet pipe (35); or a flow control valve (50) is provided at the connection between the second liquid return pipe (34) and the third liquid return pipe (36).

8. The energy storage device thermal management system according to claim 1, characterized in that: An exhaust valve (60) is provided at the highest point of the pipeline assembly in the vertical direction.

9. The energy storage device thermal management system according to claim 1, characterized in that: The pipeline assembly is provided with a drain valve (70) at the lowest point in the vertical direction.

10. The energy storage device thermal management system according to claim 1, characterized in that: The main unit (10) comprises a cabinet and a liquid pump, a heating component and a refrigeration component arranged in the cabinet; a main unit (10) pipeline connecting the first liquid inlet and the first liquid outlet is formed in the cabinet, the liquid pump is arranged on the main unit (10) pipeline to drive the heat exchange medium in the main unit (10) pipeline to flow, and the heating component and the refrigeration component are arranged in the cabinet to heat or cool the heat exchange medium in the main unit (10) pipeline respectively.

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