A cooling pipeline for energy storage, a cooling method and an energy storage device

Abstract

The application provides a cooling pipeline for energy storage, a cooling method and an energy storage device. The cooling pipeline for energy storage comprises a ring-shaped inlet main pipeline, a ring-shaped outlet main pipeline and at least one cooling branch pipeline. The inlet ends of the cooling branch pipelines are respectively and independently connected to the ring-shaped inlet main pipeline, and the outlet ends of the cooling branch pipelines are respectively and independently connected to the ring-shaped outlet main pipeline. In the application, the cooling medium enters and flows out of the cooling branch pipelines through the ring-shaped inlet main pipeline and the ring-shaped outlet main pipeline, so that the resistance of the cooling medium entering each cooling branch pipeline is effectively ensured to be similar, the temperature difference of the batteries in the energy storage system is effectively reduced, and the service life of the batteries is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of energy storage devices, and relates to a cooling pipeline for energy storage, a cooling method and an energy storage device. BACKGROUND

[0002] With the continuous pursuit of high-rate charging and discharging in the energy storage industry, liquid cooling technology is a key direction of current energy storage thermal management technology. However, the current liquid cooling technology mostly uses liquid cooling plates to exchange heat with the battery cells, and the liquid cooling pipeline form is mostly a heterogeneous pipeline. There is a problem of uneven flow distribution in each cluster in the secondary pipeline, and uneven flow distribution also exists in the tertiary pipeline. Uneven flow distribution will cause the flow deviation of the cooling liquid entering each liquid cooling plate, resulting in different temperatures of the battery cells, increasing the temperature difference of the battery cells, and affecting the service life of the battery cells.

[0003] Currently, the common solution to pipeline flow balance is to use a throttling structure to increase local resistance or to change the pipe diameter of each pipeline, so that the resistance in each pipe is similar to achieve flow balance. However, this method will redistribute the resistance after changing the total flow, and the pipeline balance will be broken. At this time, the pipe diameter must be redesigned to obtain better flow balance.

[0004] Therefore, how to provide a cooling pipeline structure that ensures similar resistance in each pipe has become an urgent technical problem to be solved. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide a cooling pipeline for energy storage, a cooling method and an energy storage device. The cooling medium enters and flows out of the cooling branch pipe through the annular inlet main pipe and the annular outlet main pipe, effectively ensuring that the cooling medium entering each cooling branch pipe has similar resistance, effectively reducing the temperature difference of the battery in the energy storage system, and improving the service life of the battery.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a cooling pipeline for energy storage, which comprises an annular inlet main pipe, an annular outlet main pipe and at least one cooling branch pipe. The inlet ends of the cooling branch pipes are independently connected to the annular inlet main pipe, and the outlet ends of the cooling branch pipes are independently connected to the annular outlet main pipe.

[0008] The application utilizes the annular inlet main pipe and the annular outlet main pipe, in the cooling process, the cooling medium enters the annular inlet main pipe, and enters each cooling branch pipe for cooling and temperature reduction, and then enters the annular outlet main pipe for discharge, when the cooling medium flows in the annular inlet main pipe and the annular outlet main pipe, due to the structural property of the annular pipe, the resistance distribution of the cooling medium in each cooling branch pipe is adjusted in real time, the annular inlet main pipe and the annular outlet main pipe are matched to ensure that the resistance in each cooling branch pipe is similar, and the pipeline resistance loss is not increased.

[0009] As a preferred technical scheme of the application, the cooling branch pipe comprises a cooling annular inlet pipe, a cooling annular outlet pipe and at least one cooling coil pipe, the inlet ends of the cooling coil pipes are independently connected to the cooling annular inlet pipe, and the outlet ends of the cooling coil pipes are independently connected to the cooling annular outlet pipe.

[0010] In the application, the cooling branch pipe is arranged to have a cooling annular inlet pipe, a cooling annular outlet pipe and a cooling coil pipe structure, through the arrangement of the multi-stage annular pipelines, the uniform distribution and similar resistance of the cooling medium at each stage are ensured, and the cooling uniformity of each cooling coil pipe is ensured.

[0011] As a preferred technical scheme of the application, the cooling coil pipe is arranged in the cooling plate.

[0012] As a preferred technical scheme of the application, the diameter of the annular outlet main pipe is 1-3 times of the diameter of the cooling annular inlet pipe, for example, 1.0 times, 1.2 times, 1.4 times, 1.6 times, 1.8 times, 2.0 times, 2.2 times, 2.4 times, 2.6 times, 2.8 times or 3.0 times.

[0013] Preferably, the diameter of the cooling annular inlet pipe is the same as the diameter of the cooling annular outlet pipe.

[0014] As a preferred technical scheme of the application, the diameter of the annular outlet main pipe is 1-5 times of the diameter of the inlet end of the cooling coil pipe, for example, 1.0 times, 1.4 times, 1.8 times, 2.2 times, 2.6 times, 3.0 times, 3.4 times, 3.8 times, 4.2 times, 4.6 times or 5.0 times.

[0015] Preferably, the diameters of the inlet end and the outlet end of the cooling coil pipe are the same.

[0016] As a preferred technical scheme of the application, the diameter of the annular outlet main pipe is 15-100 mm, for example, 15 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm or 100 mm.

[0017] It should be noted that the material of the energy storage cooling pipeline is not specifically required and specially limited, and the person skilled in the art can reasonably select according to the pipeline design requirements, for example, the material of the energy storage cooling pipeline can be stainless steel or nylon, optionally, the annular inlet main pipe and the annular outlet main pipe are made of stainless steel pipe, and the cooling branch pipe is made of nylon pipe.

[0018] In a second aspect, the present application provides a cooling method, which adopts the energy storage cooling pipeline according to the first aspect, and the cooling method comprises:

[0019] The cooling medium enters the annular inlet main pipe in a ring shape, and enters the cooling branch pipe respectively to cool and cool the heat generating components, and the cooling medium flowing through the cooling branch pipe flows into the annular outlet main pipe respectively and is discharged by the annular outlet main pipe.

[0020] It should be noted that the material of the cooling medium is not specifically required and specially limited, and the person skilled in the art can reasonably select according to the cooling effect, for example, the cooling medium can be cooling water, organic coolant, etc., and optionally, the cooling medium is glycol aqueous solution.

[0021] It should be noted that the components connected by the cooling branch pipe are not specifically required and specially limited in the present application, and the corresponding cooling components can be matched according to the specific cooling form, for example, it can be a cooling coil or a cooling plate.

[0022] As a preferred technical solution of the present application, the cooling method specifically comprises the following steps:

[0023] The cooling medium enters the cooling annular inlet pipe of each cooling branch pipe from the annular inlet main pipe respectively, and then flows into the cooling coil in the cooling annular inlet pipe respectively to cool and cool the heat generating components, and the cooling medium flows into the cooling annular outlet pipe from the cooling coil and is discharged by the cooling annular outlet pipe into the annular outlet main pipe.

[0024] In a third aspect, the present application provides an energy storage device, which comprises a box body and a cooling device, the cooling device comprises a cooling medium supply device and an energy storage cooling pipeline according to the first aspect, at least one battery cluster is arranged in the box body, the cooling branch pipe is arranged inside and / or outside the battery cluster, and the cooling branch pipe cools and cools the battery cluster.

[0025] The energy storage device of the present application adopts the energy storage cooling pipeline with the annular inlet main pipe and the annular outlet main pipe, which effectively ensures the cooling effect of each battery cluster, thereby reducing the temperature difference of each battery cluster and improving the service life of the battery.

[0026] It should be noted that the present application does not make specific requirements and special limitations on the arrangement form of the cooling pipeline for energy storage, and the person skilled in the art can reasonably set up according to the structure of the energy storage device, for example, the annular inlet main pipe and the annular outlet main pipe are respectively integrated at the bottom and the top of the box, and the cooling branch pipe enters the battery cluster in the box.

[0027] As a preferred technical solution of the present application, the cooling branch pipe comprises a cooling annular inlet pipe, a cooling annular outlet pipe and at least one cooling coil, the inlet end of the cooling coil is independently connected to the cooling annular inlet pipe, and the outlet end of the cooling coil is independently connected to the cooling annular outlet pipe.

[0028] The battery cluster comprises at least one battery pack, and the battery pack is provided with a cooling plate, and the cooling coil is correspondingly arranged in the cooling plate.

[0029] The numerical range of the present application includes not only the above-mentioned point values, but also any point values between the above-mentioned numerical ranges which are not mentioned, and for the sake of brevity and simplicity, the present application does not enumerate the specific point values included in the range.

[0030] Compared with the prior art, the present application has the following beneficial effects:

[0031] The present application utilizes the annular inlet main pipe and the annular outlet main pipe, in the cooling process, the cooling medium enters the annular inlet main pipe, and after cooling and cooling in each cooling branch pipe, it enters the annular outlet main pipe for discharge, when the cooling medium flows in the annular inlet main pipe and the annular outlet main pipe, due to the structural property of the ring pipe, the resistance distribution of the cooling medium in each cooling branch pipe is adjusted in real time, by utilizing the cooperation of the annular inlet main pipe and the annular outlet main pipe, the resistance in each cooling branch pipe is ensured to be similar, and the pipeline resistance loss is not increased. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The structure diagram of the cooling pipeline for energy storage provided in one specific embodiment of the present application is shown in the figure;

[0033] Figure 2 The structure diagram of the cooling branch pipe provided in one specific embodiment of the present application is shown in the figure.

[0034] Among them, 1-annular inlet main pipe; 2-annular outlet main pipe; 3-cooling branch pipe; 4-cooling annular inlet pipe; 5-cooling annular outlet pipe; 6-cooling coil; 7-cooling plate. DETAILED DESCRIPTION

[0035] It should be understood that, in the description of the present application, the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0036] It should be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] The technical solutions of the present application will be further described below through specific embodiments.

[0038] In one specific embodiment, the present application provides an energy storage cooling pipeline, which comprises a ring-shaped inlet main pipe 1, a ring-shaped outlet main pipe 2 and at least one cooling branch pipe 3, the inlet end of the cooling branch pipe 3 is independently connected to the ring-shaped inlet main pipe 1, and the outlet end of the cooling branch pipe 3 is independently connected to the ring-shaped outlet main pipe 2. Figure 1 Specifically, as shown in the figure, the cooling branch pipe 3 comprises a cooling ring-shaped inlet pipe 4, a cooling ring-shaped outlet pipe 5 and at least one cooling coil 6, the inlet end of the cooling coil 6 is independently connected to the cooling ring-shaped inlet pipe 4, and the outlet end of the cooling coil 6 is independently connected to the cooling ring-shaped outlet pipe 5. In the present application, the cooling branch pipe 3 is provided with a cooling ring-shaped inlet pipe 4, a cooling ring-shaped outlet pipe 5 and a cooling coil 6 structure, and through the arrangement of multiple levels of ring-shaped pipelines, the uniform distribution and similar resistance of each level of cooling medium are ensured, and the cooling uniformity of each cooling coil 6 is ensured.

[0039] Figure 2 Specifically, the cooling coil 6 is arranged in the cooling plate 7.

[0040] Specifically, the diameter of the ring-shaped outlet main pipe 2 is 1-3 times the diameter of the cooling ring-shaped inlet pipe 4. Further, the diameter of the cooling ring-shaped inlet pipe 4 is the same as the diameter of the cooling ring-shaped outlet pipe 5.

[0041] Specifically, the diameter of the ring-shaped outlet main pipe 2 is 1-3 times the diameter of the cooling ring-shaped inlet pipe 4. Further, the diameter of the cooling ring-shaped inlet pipe 4 is the same as the diameter of the cooling ring-shaped outlet pipe 5.

[0042] ​Specifically, the diameter of the annular outlet main pipe 2 is 1-5 times of the diameter of the inlet end of the cooling coil 6. Further, the diameter of the inlet end and the outlet end of the cooling coil 6 is the same.

[0043] Specifically, the diameter of the annular outlet main pipe 2 is 15-100 mm.

[0044] It should be noted that the material of the energy storage cooling pipeline can be stainless steel or nylon. Alternatively, the annular inlet main pipe 1 and the annular outlet main pipe 2 are made of stainless steel pipes, and the cooling branch pipes 3 are made of nylon pipes.

[0045] In another specific embodiment, the present application provides a cooling method using the above-mentioned energy storage cooling pipeline, which comprises:

[0046] The cooling medium enters the annular inlet main pipe 1 in a ring shape, and then enters the cooling branch pipes 3 respectively to cool and cool the heat generating components. The cooling medium flowing through the cooling branch pipes 3 flows into the annular outlet main pipe 2 respectively and is discharged by the annular outlet main pipe 2. For example, the cooling medium can be cooling water, organic coolant, etc. Alternatively, the cooling medium is glycol aqueous solution.

[0047] Specifically, the cooling method specifically comprises the following steps:

[0048] The cooling medium enters the cooling annular inlet pipe 4 of each cooling branch pipe 3 from the annular inlet main pipe 1 respectively, and then flows into the cooling coil 6 from the cooling annular inlet pipe 4 respectively to cool and cool the heat generating components. The cooling medium flows into the cooling annular outlet pipe 5 from the cooling coil 6, and is discharged by the cooling annular outlet pipe 5 into the annular outlet main pipe 2.

[0049] The present application also provides an energy storage device, which comprises a box body and a cooling device, the cooling device comprising a cooling medium supply device and the above-mentioned energy storage cooling pipeline, at least one battery cluster is arranged in the box body, the cooling branch pipes 3 are arranged inside and / or outside the battery cluster, and the cooling branch pipes 3 cool and cool the battery cluster.

[0050] The energy storage device of the present application uses the energy storage cooling pipeline with the annular inlet main pipe 1 and the annular outlet main pipe 2, which effectively ensures the cooling effect of each battery cluster all the time, thereby reducing the temperature difference of each battery cluster and improving the service life of the battery.

[0051] Specifically, the cooling branch pipe 3 comprises a cooling annular inlet pipe 4, a cooling annular outlet pipe 5, and at least one cooling coil pipe 6, the inlet ends of the cooling coil pipes 6 are independently connected to the cooling annular inlet pipe 4 respectively, and the outlet ends of the cooling coil pipes 6 are independently connected to the cooling annular outlet pipe 5 respectively. The battery cluster comprises at least one battery pack, the battery pack is provided with a cooling plate 7, and the cooling coil pipes 6 are arranged in the cooling plate 7 one by one.

[0052] Embodiment 1

[0053] The embodiment provides a cooling pipeline for energy storage, which comprises an annular inlet main pipe 1, an annular outlet main pipe 2 and six cooling branch pipes 3, the inlet ends of the cooling branch pipes 3 are independently connected to the annular inlet main pipe 1 respectively, the outlet ends of the cooling branch pipes 3 are independently connected to the annular outlet main pipe 2 respectively, the annular outlet main pipe 2 and the annular inlet main pipe 1 are stainless steel pipes with a diameter of 50 mm, and the cooling branch pipes 3 are pipes with a diameter of 25 mm.

[0054] The embodiment also provides an energy storage device, which comprises a box body and a cooling device, the cooling device comprises a cooling medium supply device and the above cooling pipeline for energy storage, six battery packs are arranged in the box body, a cooling plate 7 is arranged in each battery pack, the cooling branch pipes 3 are connected to the cooling plate 7 in the battery pack one by one, and the cooling medium is an ethylene glycol aqueous solution. The size of the box body is 1.6 m*1.4 m*2.3 m.

[0055] Under the condition of 0.5C of the batteries in the energy storage device, the flow rate of the cooling liquid is 60 L / min, the flow rate in each battery pack liquid cooling channel is 10 L / min, after measurement, the flow rate deviation in the cooling branch pipes 3 is 5%, and the temperature difference of the battery packs in the whole energy storage device is 2.5 DEG C, compared with the non-loop cooling condition, the flow rate deviation is reduced by 10% and the temperature difference is reduced by 3 DEG C.

[0056] It should be noted that the "non-loop cooling condition" in the embodiment refers to: comprising an inlet straight pipe and an outlet straight pipe, the cooling medium enters the inlet straight pipe, the inlet ends of the cooling branch pipes 3 are independently connected to the inlet straight pipe respectively, and the outlet ends of the cooling branch pipes 3 are independently connected to the outlet straight pipe, so the difference from the embodiment is that the annular inlet main pipe 1 is replaced by the inlet straight pipe and the annular outlet main pipe 2 is replaced by the outlet straight pipe.

[0057] Embodiment 2

[0058] The embodiment provides a cooling pipeline for energy storage, which comprises an annular inlet main pipe 1, an annular outlet main pipe 2 and twelve cooling branch pipes 3, the inlet ends of the cooling branch pipes 3 are independently connected to the annular inlet main pipe 1 respectively, the outlet ends of the cooling branch pipes 3 are independently connected to the annular outlet main pipe 2 respectively, and the annular outlet main pipe 2 and the annular inlet main pipe 1 are stainless steel pipes with a diameter of 50 mm.

[0059] The cooling branch pipe 3 comprises a cooling annular inlet pipe 4, a cooling annular outlet pipe 5 and six cooling coils 6, the inlet ends of the cooling coils 6 are independently connected to the cooling annular inlet pipe 4 respectively, and the outlet ends of the cooling coils 6 are independently connected to the cooling annular outlet pipe 5 respectively. Further, the cooling coils 6 are integrally arranged in the cooling plate 7 of the battery pack. The cooling annular inlet pipe 4 and the cooling annular outlet pipe 5 are nylon pipes with a diameter of 25 mm. The inlet ends and the outlet ends of the cooling coils 6 are nylon pipes with a diameter of 14 mm.

[0060] The embodiment also provides an energy storage device, comprising a box body and a cooling device, the cooling device comprises a cooling medium supply device and the above-mentioned cooling pipeline for energy storage, 12 battery clusters are arranged in the box body, 6 battery packs are arranged in each battery cluster, the cooling plate 7 is arranged in the battery pack, the cooling coil 6 is correspondingly and integrally arranged in the cooling plate 7, and the cooling medium is a glycol aqueous solution. The box body is a 30-foot container.

[0061] Under the condition of 0.5C of the batteries in the energy storage device, the flow rate of the cooling liquid is 360 L / min, the flow rate in each battery pack liquid cooling channel is 5 L / min, after measurement, the flow rate deviation in the cooling coil 6 is 5%, the temperature difference of the battery packs in the whole energy storage device is 3℃, compared with the non-loop cooling condition, the flow rate deviation is reduced by 15% and the temperature difference is reduced by 3℃.

[0062] It should be noted that the "non-loop cooling condition" in the embodiment refers to that the annular inlet main pipe 1 is replaced by an inlet straight pipe, the annular outlet main pipe 2 is replaced by an outlet straight pipe, further, the liquid cooling inlet branch pipe and the liquid cooling outlet straight pipe are used to replace the cooling annular inlet pipe 4 and the cooling annular outlet pipe 5 respectively.

[0063] Through the above embodiment, the annular inlet main pipe 1 and the annular outlet main pipe 2 are used, in the cooling process, the cooling medium enters the annular inlet main pipe 1, and then enters each cooling branch pipe 3 for cooling and temperature reduction, and then enters the annular outlet main pipe 2 for discharge, when the cooling medium flows in the annular inlet main pipe 1 and the annular outlet main pipe 2, due to the structural property of the ring pipe, the resistance distribution of the cooling medium in each cooling branch pipe 3 is adjusted in real time, the annular inlet main pipe 1 and the annular outlet main pipe 2 are used to ensure that the resistances in each cooling branch pipe 3 are similar, and the pipeline resistance loss is not increased.

[0064] The applicant declares that the above description is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, and those skilled in the art should understand that any changes or replacements within the technical scope disclosed by the present application can be easily thought by any person skilled in the art, and all fall within the protection scope and disclosure scope of the present application.

Claims

1. A cooling pipeline for energy storage, characterized in that, The energy storage cooling pipeline includes an annular inlet main pipe, an annular outlet main pipe, and at least one cooling branch pipe. The inlet end of each cooling branch pipe is independently connected to the annular inlet main pipe, and the outlet end of each cooling branch pipe is independently connected to the annular outlet main pipe. The cooling branch pipe includes a cooling annular inlet pipe, a cooling annular outlet pipe, and at least one cooling coil. The inlet end of each cooling coil is independently connected to the cooling annular inlet pipe, and the outlet end of each cooling coil is independently connected to the cooling annular outlet pipe.

2. The energy storage cooling pipeline according to claim 1, characterized in that, The cooling coil is located inside the cooling plate.

3. The energy storage cooling pipeline according to claim 1, characterized in that, The diameter of the annular outlet main pipe is 1 to 3 times the diameter of the cooling annular inlet pipe.

4. The cooling pipeline for energy storage according to claim 1, characterized in that, The diameter of the cooling annular inlet pipe is the same as the diameter of the cooling annular outlet pipe.

5. The energy storage cooling pipeline according to claim 1, characterized in that, The diameter of the annular outlet main pipe is 1 to 5 times the diameter of the inlet end of the cooling coil.

6. The cooling pipeline for energy storage according to claim 1, characterized in that, The inlet and outlet diameters of the cooling coil are the same.

7. The energy storage cooling pipeline according to claim 1, characterized in that, The diameter of the annular outlet main pipe is 15-100 mm.

8. A cooling method, characterized in that, The cooling method employs the energy storage cooling pipeline as described in any one of claims 1-7, and the cooling method includes: The cooling medium enters the annular inlet main pipe in a ring shape, and then enters the cooling branch pipes through the annular inlet main pipe to cool and reduce the temperature of the heat-generating components. After flowing through the cooling branch pipes, the cooling medium flows independently into the annular outlet main pipe and is discharged from the annular outlet main pipe.

9. The cooling method according to claim 8, characterized in that, The cooling method specifically includes the following steps: The cooling medium enters the cooling ring inlet pipe of each cooling branch pipe from the main ring inlet pipe, and then flows into the cooling coil to cool the heat-generating components. After flowing out of the cooling coil, the cooling medium flows into the cooling ring outlet pipe and is discharged into the main ring outlet pipe.

10. An energy storage device, the energy storage device comprising a housing and a cooling device, characterized in that, The cooling device includes a cooling medium supply device and a cooling pipeline for energy storage as described in any one of claims 1-7. At least one battery cluster is disposed inside the housing, and the cooling branch pipe is disposed inside and / or outside the battery cluster, and the cooling branch pipe cools the battery cluster.

11. The energy storage device according to claim 10, characterized in that, The cooling branch pipe includes a cooling annular inlet pipe, a cooling annular outlet pipe, and at least one cooling coil. The inlet end of each cooling coil is independently connected to the cooling annular inlet pipe, and the outlet end of each cooling coil is independently connected to the cooling annular outlet pipe. The battery cluster includes at least one battery pack, the battery pack is provided with a cooling plate, and the cooling coils are arranged one-to-one in the cooling plate.

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