Vertical liquid-cooled battery plug-in box and energy storage system

Abstract

The utility model relates to the technical field of energy storage batteries, and provides a vertical liquid-cooled battery plug-in box, which comprises a box body, a plurality of battery modules and a liquid-cooled system, the plurality of battery modules are connected in series and are sequentially arranged in the box body along the height direction of the box body, each battery module comprises two battery cell groups, and the liquid-cooled system is arranged in the box body. The liquid cooling system comprises a liquid cooling unit, a water supply pipeline, a water outlet pipeline and a liquid cooling plate, the water supply pipeline and the water outlet pipeline are connected with the liquid cooling unit, the liquid cooling plate is arranged between the two battery cell groups, the two sides of the liquid cooling plate are in contact with the two battery cell groups respectively, and the liquid cooling plate is provided with a water inlet, a water outlet and an internal flow channel. Each of the water supply pipeline and the water outlet pipeline comprises a main pipe and a plurality of branch pipes, the main pipe extends along the height direction, the plurality of branch pipes are arranged in parallel, the plurality of water supply branch pipes are communicated with the water inlets of the plurality of liquid cooling plates, and the plurality of water outlet branch pipes are communicated with the water outlets of the plurality of liquid cooling plates. The utility model further discloses an energy storage system.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage batteries, and particularly relates to a vertical liquid-cooled battery insertion box and an energy storage system. Background Art

[0002] At present, with the continuous development of energy storage technology, energy storage containers or energy storage outdoor cabinets, as a new type of energy storage device, have been widely used in the fields of electric power, communication, new energy, etc. The inside of an energy storage system usually consists of multiple battery insertion boxes. In order to meet the temperature control requirements of the energy storage system, an effective heat dissipation system needs to be provided for it. At present, the liquid-cooling solution is considered an effective means of battery thermal management. In addition to high heat exchange efficiency, the liquid-cooled energy storage system also has advantages such as high integrated energy density, strong adaptability, safety and stability, and environmental friendliness compared with the air-cooled energy storage system.

[0003] Existing liquid-cooled energy storage systems generally adopt the scheme of horizontal insertion boxes and bottom-cooled liquid cooling. This scheme originated from the electric vehicle industry. Due to space limitations, bottom cooling is indeed the best solution. So far, this technology has been relatively mature and the development risk is low. However, for the energy storage industry, there are certain drawbacks in using this scheme, mainly reflected in that the battery insertion boxes stacked up and down are not conducive to installation, maintenance and replacement, and the bottom surface of the battery cell is usually the smallest surface of the currently used large-capacity lithium battery cells. The bottom-cooled scheme of the horizontal insertion box will lead to low heat dissipation efficiency. Summary of the Utility Model

[0004] To solve the above technical problems, the utility model provides the following technical solutions:

[0005] In the first aspect, the present application provides a vertical liquid-cooled battery insertion box, including a box body, a battery module and a liquid-cooling system. The number of the battery modules is multiple, and the multiple battery modules are connected in series and arranged in the box body in sequence along the height direction of the box body. The battery module includes a battery cell group. The number of the battery cell groups is two, and the two battery cell groups are connected in series and arranged side by side. The liquid-cooling system includes a water supply pipeline, a water outlet pipeline and a liquid-cooling plate. Both the water supply pipeline and the water outlet pipeline are connected to a liquid-cooling unit. The liquid-cooling plate is arranged between the two battery cell groups and is in contact with the two battery cell groups on both sides respectively. The liquid-cooling plate is provided with a water inlet, a water outlet and an internal flow channel. Both the water supply pipeline and the water outlet pipeline include a main pipe and multiple branch pipes. The main pipe extends along the height direction, and the multiple branch pipes are arranged in parallel. The multiple water supply branch pipes are communicated with the water inlets of the multiple liquid-cooling plates, and the multiple water outlet branch pipes are communicated with the water outlets of the multiple liquid-cooling plates.

[0006] On the basis of the above technical solution, the inlet of the main pipe of the water supply pipeline is arranged at the top end, and the outlet of the main pipe of the water outlet pipeline is arranged at the bottom end, so that the refrigerant is transported in the upward-inlet and downward-outlet flow direction.

[0007] Based on the above technical solution, the battery cell group includes a plurality of battery cells and aluminum bars. The plurality of battery cells are arranged in sequence along the thickness direction of the battery cells, and adjacent two battery cells are connected in series through aluminum bars.

[0008] Based on the above technical solution, a gasket is provided between adjacent two battery cells.

[0009] Based on the above technical solution, the plurality of battery modules and between two battery cell groups are connected in series through copper bars.

[0010] Based on the above technical solution, a heat-conducting adhesive is filled between the battery cell group and the liquid cooling plate.

[0011] Based on the above technical solution, the battery module further includes an insulating cover plate, and the insulating cover plate covers the tops of two battery cell groups.

[0012] Based on the above technical solution, the battery module further includes a fixing steel band, and the fixing steel band is circumferentially disposed around two battery cell groups to squeeze the liquid cooling plate between the two battery cell groups.

[0013] Based on the above technical solution, end plates are provided at both ends of the battery cell group along the thickness direction of the battery cells.

[0014] Based on the above technical solution, the main pipe and the branch pipe are connected through an adapter pipe.

[0015] Based on the above technical solution, the box body includes a structural beam and a module tray. The structural beam includes a cross beam, a vertical beam and an inclined beam. The cross beam and the vertical beam form a box body frame. The inclined beams are inclinedly arranged on both sides of the box body frame. The number of module trays is multiple, and the multiple module trays are sequentially arranged at intervals along the height direction within the box body frame.

[0016] In a second aspect, the present application provides an energy storage system, including the vertical liquid-cooled battery insertion box as described in any one of the above embodiments.

[0017] Compared with the related art, the beneficial effects of the present utility model are as follows:

[0018] 1. By connecting a plurality of battery modules in series and arranging them along the height direction of the box body, the height of the vertical liquid-cooled battery insertion box can be controlled. By arranging the liquid cooling plate between two battery cell groups, two battery cell groups share one liquid cooling plate. Compared with the traditional liquid cooling plate that contacts the battery cells on one side, on the one hand, the material of the liquid cooling plate can be saved, and on the other hand, the cold loss can be reduced, and the heat exchange efficiency can be improved to a certain extent. Compared with the bottom-cooled liquid cooling plate, in the present application, the liquid cooling plate is arranged between two battery cell groups, avoiding the need for the bottom-cooled liquid cooling plate to consider load-bearing and making a structural strengthening design, which can simplify the structural design steps and materials, and reduce the design difficulty and manufacturing cost.

[0019] 2. In the present utility model, the main pipes of the water supply pipeline and the water outlet pipeline of the liquid cooling system extend in the height direction, and multiple branch pipes are arranged in parallel. This can evenly distribute the refrigerant to each liquid cooling plate, ensuring that each battery module is fully cooled, reducing the local hot spot problem caused by insufficient flow in a single pipeline, and improving the temperature consistency among the battery cells. The parallel pipelines can reduce the resistance of fluid flow, thereby reducing the energy consumption of the liquid cooling system and improving the overall cooling efficiency. The parallel structure helps to maintain the pressure balance in each part of the system and reduce potential hazards caused by pressure differences.

[0020] 3. During the operation of the refrigerant in the present utility model, it enters the main pipe from the inlet at the top end of the main pipe of the water supply pipeline and flows downward. It is branched from the main pipe to multiple branch pipes and enters multiple liquid cooling plates simultaneously through the water inlets. It flows along the internal flow channels of the liquid cooling plates to the water outlets, then flows out of the liquid cooling plates through the multiple branch pipes of the water outlet pipeline, converges from the multiple branch pipes into the main pipe of the water outlet pipeline, and flows downward and out through the outlet. This upward-inlet and downward-outlet refrigerant delivery method can utilize the gravity of the refrigerant for flow, and to a certain extent, reduce the frictional resistance along the way compared with the bottom-cooled liquid cooling plate, improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only one embodiment of the present utility model. For those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained by extending the provided drawings.

[0022] Figure 1 It is a schematic structural diagram of a vertical liquid-cooled battery insertion box provided by the present utility model;

[0023] Figure 2 It is provided by the present utility model Figure 1 An enlarged schematic structural diagram of part A shown therein;

[0024] Figure 3 It is a schematic structural diagram of a battery module provided by the present utility model;

[0025] Figure 4 It is a schematic structural diagram of a liquid cooling system provided by the present utility model;

[0026] Figure 5 It is an exploded schematic structural diagram of a battery module provided by the present utility model;

[0027] Figure 6 It is a schematic structural diagram of a box body provided by the present utility model.

[0028] In the figure: 1. Box body; 11. Structural beam; 111. Cross beam; 112. Vertical beam; 113. Inclined beam; 12. Module tray; 2. Battery module; 21. Cell group; 211. Cell; 212. Aluminum busbar; 22. Copper busbar; 23. Insulating cover plate; 24. Fixed steel band; 25. End plate; 26. Gasket; 3. Liquid cooling system; 31. Water supply pipeline; 32. Water outlet pipeline; 33. Liquid cooling plate; 331. Water inlet; 332. Water outlet; 34. Main pipe; 35. Branch pipe; 36. Adapter pipe. Detailed implementation mode

[0029] The present utility model will be further described below in conjunction with the accompanying drawings and examples:

[0030] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0031] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0032] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0033] Combined with Figures 1-6As shown in the figure, an embodiment of the present disclosure provides a vertical liquid-cooled battery cassette, which includes a box body 1, a battery module 2, and a liquid cooling system 3. The number of the battery modules 2 is multiple. The multiple battery modules 2 are connected in series and arranged in the box body 1 in sequence along the height direction of the box body 1. The battery module 2 includes a battery cell group 21. The number of the battery cell groups 21 is two. The two battery cell groups 21 are connected in series and arranged side by side. The liquid cooling system 3 includes a water supply pipeline 31, a water outlet pipeline 32, and a liquid cooling plate 33. The water supply pipeline 31 and the water outlet pipeline 32 are both connected to a liquid cooling unit. The liquid cooling plate 33 is arranged between the two battery cell groups 21 and is in contact with the two battery cell groups 21 on both sides respectively. The liquid cooling plate 33 is provided with a water inlet 331, a water outlet 332, and an internal flow channel. The water supply pipeline 31 and the water outlet pipeline 32 both include a main pipe 34 and multiple branch pipes 35. The main pipe 34 extends along the height direction. The multiple branch pipes 35 are arranged in parallel. The multiple water supply branch pipes 35 are communicated with the water inlets 331 of the multiple liquid cooling plates 33. The multiple water outlet branch pipes 35 are communicated with the water outlets 332 of the multiple liquid cooling plates 33.

[0034] By using the vertical liquid-cooled battery cassette provided by the embodiment of the present disclosure, by connecting multiple battery modules 2 in series and arranging them along the height direction of the box body 1, the height of the vertical liquid-cooled battery cassette can be controlled. By arranging the liquid cooling plate 33 between the two battery cell groups 21, the two battery cell groups 21 share one liquid cooling plate 33. Compared with the traditional liquid cooling plate 33 that contacts the battery cell group 21 on one side, on the one hand, the material of the liquid cooling plate 33 can be saved, and on the other hand, the cold loss can be reduced, and the heat exchange efficiency can be improved to a certain extent. Compared with the bottom-cooled liquid cooling plate 33, in this application, the liquid cooling plate 33 is arranged between the two battery cell groups 21, avoiding the need to consider load-bearing for the bottom-cooled liquid cooling plate 33 and making a structural strengthening design, which can simplify the structural design steps and materials, and reduce the design difficulty and manufacturing cost.

[0035] The main pipes 34 of the water supply pipeline 31 and the water outlet pipeline 32 of the liquid cooling system 3 extend along the height direction, and the multiple branch pipes 35 are arranged in parallel, which can evenly distribute the refrigerant to each liquid cooling plate 33, ensure that each battery module 2 is fully cooled, reduce the local hot spot problem caused by insufficient flow in a single pipeline, and improve the temperature consistency among the battery cells 211; the parallel pipelines can reduce the resistance of fluid flow, thereby reducing the energy consumption of the liquid cooling system 3 and improving the overall cooling efficiency; the parallel structure helps to maintain the pressure balance of each part in the system and reduce the potential hazards caused by pressure differences.

[0036] On the basis of the above technical solutions, as Figure 1 、 Figure 2 and Figure 4 shown, the inlet of the main pipe 34 of the water supply pipeline 31 is arranged at the top end, and the outlet of the main pipe 34 of the water outlet pipeline 32 is arranged at the bottom end, so that the refrigerant is transported in the upward-in and downward-out flow direction.

[0037] In this embodiment, during the operation of the refrigerant, it enters the main pipe 34 from the inlet at the top of the main pipe 34 of the water supply pipeline 31 and flows downward. It is diverted from the main pipe 34 to a plurality of branch pipes 35 and simultaneously enters a plurality of liquid cooling plates 33 through the water inlets 331, flows along the internal flow channels of the liquid cooling plates 33 to the water outlets 332, then flows out of the liquid cooling plates 33 through the plurality of branch pipes 35 of the water discharge pipeline 32, converges from the plurality of branch pipes 35 into the main pipe 34 of the water discharge pipeline 32, and flows downward and out from the outlet. This upward-inlet and downward-outlet refrigerant delivery method can utilize the gravitational force of the refrigerant for flow, and can reduce the frictional resistance along the way to a certain extent compared with the bottom-cooled liquid cooling plate 33, thereby improving the cooling efficiency.

[0038] Based on the above technical solution, as Figure 3 shown, the battery cell group 21 includes a plurality of battery cells 211 and aluminum bars 212. The plurality of battery cells 211 are arranged in sequence along the thickness direction of the battery cells 211, and two adjacent battery cells 211 are connected in series through an aluminum bar 212.

[0039] Each battery cell 211 is provided with a positive electrode tab and a negative electrode tab. Between every two adjacent battery cells 211, the positive electrode tab of one battery cell 211 is connected to the negative electrode tab of another battery cell 211 through an aluminum bar 212 to connect two adjacent battery cells 211 in series. By analogy, all the battery cells 211 in the battery cell group 21 are connected in series.

[0040] Based on the above technical solution, as Figure 5 shown, a gasket 26 is provided between two adjacent battery cells 211. The gasket 26 is generally made of an insulating material to prevent contact short-circuit between two battery cells 211, which may affect the normal operation of the battery cell group 21, the entire battery module 2, and the battery cassette.

[0041] Optionally, the plurality of battery modules 2 and between two battery cell groups 21 are connected in series through copper bars 22. The connection between two battery cell groups 21 and between battery modules 2 involves a relatively long transmission path. Using copper bars 22 for series connection has better electrical conductivity compared with aluminum bars 212, can reduce the energy consumption to a certain extent, and thus improve the charge and discharge efficiency.

[0042] Based on the above technical solution, a thermal conductive adhesive is filled between the battery cell group 21 and the liquid cooling plate 33 to ensure the thermal conductivity efficiency between the battery cell group 21 and the liquid cooling plate 33.

[0043] Based on the above technical solution, as Figure 1 shown, the battery module 2 further includes an insulating cover plate 23, and the insulating cover plate 23 covers the tops of two battery cell groups 21.

[0044] Based on the above technical solution, asFigure 3 and Figure 5 As shown in Figure 5 , the battery module 2 further includes a fixing steel strip 24, and the fixing steel strip 24 is circumferentially disposed around the two battery cell groups 21 to squeeze the liquid cooling plate 33 between the two battery cell groups 21.

[0045] The fixing steel strip 24 plays a role in fixing the battery cell group 21 and the liquid cooling plate 33. The liquid cooling plate 33 is squeezed between the two battery cell groups 21 by using the fixing steel strip 24, and a heat-conducting adhesive is filled between the battery cell group 21 and the liquid cooling plate 33 to ensure close contact between the two, effectively reducing the contact thermal resistance, thereby improving the heat exchange efficiency. The number of the fixing steel strips 24 is usually two, or may be multiple. In this application, taking the number of the fixing steel strips 24 as two as an example, the two fixing steel strips 24 can provide uniform pressing force for the battery cell group 21.

[0046] On the basis of the above technical solution, as Figure 3 and Figure 5 shown, end plates 25 are provided at both ends of the battery cell group 21 in the thickness direction of the battery cell 211.

[0047] During the process of using the fixing steel strip 24 to fix the battery cell group 21 and the liquid cooling plate 33, in order to play a role in squeezing between the battery cell group 21 and the liquid cooling plate 33, an inward acting force needs to be applied to the two battery cell groups 21 first to tighten the two battery cell groups 21 and the liquid cooling plate 33 in the middle together, and then the fixing steel strip 24 is circumferentially sleeved on the outside for fixation. The end plates 25 are provided at both ends of the battery cell group 21, which can play a role in protecting the battery cell group 21. On the one hand, it can avoid unnecessary damage to the battery cell group 21 when applying the acting force, and on the other hand, since the fixing steel strip 24 is sleeved and tied around the outside of the battery cell group 21 for a long time, the end plates 25 can prevent the fixing steel strip 24 from causing a certain degree of wear to the battery cell group 21.

[0048] Optionally, as Figure 2 shown, the main pipe 34 and the branch pipe 35, and between the branch pipe 35 and the liquid cooling plate 33 are connected through an adapter pipe 36.

[0049] On the basis of the above technical solution, as Figure 6 shown, the box body 1 includes a structural beam 11 and a module tray 12. The structural beam 11 includes a cross beam 111, a vertical beam 112, and an inclined beam 113. The cross beam 111 and the vertical beam 112 form the frame of the box body 1. The inclined beam 113 is inclined and disposed on both sides of the frame of the box body 1. The number of the module trays 12 is multiple, and the multiple module trays 12 are sequentially and spaced apart in the height direction within the frame of the box body 1.

[0050] In a second aspect, the present application provides an energy storage system, including the vertical liquid-cooled battery insertion box as described in any one of the above embodiments.

[0051] The energy storage system provided by the embodiment of the present disclosure includes the vertical liquid-cooled battery insertion box described in any one of the above-mentioned disclosed embodiments, and thus has all the beneficial effects of the vertical liquid-cooled battery insertion box described in any one of the above-mentioned disclosed embodiments, which will not be elaborated here.

[0052] Optionally, the energy storage system includes a plurality of vertical liquid-cooled battery insertion boxes, and the plurality of vertical liquid-cooled battery insertion boxes are horizontally arranged in an array in the energy storage system, similar to drawer-type assembly at the same height, which is more convenient for installation, maintenance and replacement.

[0053] On the basis of the above technical solution, each of the plurality of vertical liquid-cooled battery insertion boxes is provided with a main pipe 34 and a branch pipe 35 for the water supply pipe 31 and the water discharge pipe 32. The water supply pipe group is provided with a water supply main pipe at the top of the battery insertion box. The water supply main pipe is provided with a plurality of water supply ports, and the plurality of water supply ports are oppositely arranged with the inlets of the main pipes 34 of the plurality of water supply pipes 31 to supply water to the plurality of main pipes 34 uniformly. The water discharge pipe 32 is provided with a water discharge main pipe at the bottom of the battery insertion box. The water discharge main pipe is provided with a plurality of water discharge ports, and the plurality of water discharge ports are oppositely arranged with the outlets of the main pipes 34 of the plurality of water discharge pipes 32. The water flows of the plurality of main pipes 34 converge to the water discharge main pipe and are discharged out of the battery insertion box.

[0054] The present invention has been described by way of example above, but the present invention is not limited to the above specific embodiments. Any modification or variation based on the present invention falls within the scope of protection required by the present invention.

Claims

1. A vertical liquid-cooled battery cassette, characterized in that It includes a box body, a battery module and a liquid cooling system. The number of the battery modules is multiple. The multiple battery modules are connected in series and arranged in the box body in sequence along the height direction of the box body. The battery module includes a battery cell group. The number of the battery cell groups is two. The two battery cell groups are connected in series and arranged side by side. The liquid cooling system includes a liquid cooling unit, a water supply pipeline, a water outlet pipeline and a liquid cooling plate. The water supply pipeline and the water outlet pipeline are both connected to the liquid cooling unit. The liquid cooling plate is arranged between the two battery cell groups and is in contact with the two battery cell groups on both sides respectively. The liquid cooling plate is provided with a water inlet, a water outlet and an internal flow channel. The water supply pipeline and the water outlet pipeline both include a main pipe and multiple branch pipes. The main pipe extends along the height direction. The multiple branch pipes are arranged in parallel. The multiple water supply branch pipes are communicated with the water inlets of the multiple liquid cooling plates. The multiple water outlet branch pipes are communicated with the water outlets of the multiple liquid cooling plates.

2. The vertical liquid-cooled battery cassette according to claim 1, characterized in that, The inlet of the main pipe of the water supply pipeline is arranged at the top end, and the outlet of the main pipe of the water outlet pipeline is arranged at the bottom end so that the refrigerant is conveyed in the flowing direction of flowing in from the top and flowing out from the bottom.

3. The vertical liquid-cooled battery cassette according to claim 1, characterized in that, The battery cell group includes multiple battery cells and aluminum bars. The multiple battery cells are arranged in sequence along the thickness direction of the battery cells. Adjacent two battery cells are connected in series through the aluminum bars.

4. The vertical liquid-cooled battery cassette according to claim 1, characterized in that, The multiple battery modules are connected in series through copper bars between them, and the two battery cell groups are connected in series through copper bars between them.

5. The vertical liquid-cooled battery cassette according to claim 1, characterized in that, A heat-conducting glue is filled between the battery cell group and the liquid cooling plate.

6. The vertical liquid-cooled battery cassette according to any one of claims 1 to 5, characterized in that The battery module further includes an insulating cover plate which is covered on the top of the two battery cell groups.

7. The vertical liquid-cooled battery cassette according to any one of claims 1 to 5, characterized in that The battery module further includes a fixing steel band which is circumferentially arranged around the two battery cell groups to squeeze the liquid cooling plate between the two battery cell groups.

8. The vertical liquid-cooled battery cassette according to any one of claims 1 to 5, characterized in that, The main pipe and the branch pipes are connected through adapter pipes, and the branch pipes and the liquid cooling plates are connected through adapter pipes.

9. The vertical liquid-cooled battery cassette according to any one of claims 1 to 5, characterized in that, The box body includes a structural beam and a module tray. The structural beam includes a cross beam, a vertical beam and an inclined beam. The cross beam and the vertical beam form a box body frame. The inclined beams are inclined and arranged on both sides of the box body frame. The number of the module trays is multiple. The multiple module trays are arranged at intervals in sequence along the height direction in the box body frame.

10. An energy storage system, characterized in that, It includes a vertical liquid-cooled battery plug-in box according to any one of claims 1 to 9.

Images