Battery device and energy storage system

Abstract

The utility model discloses a battery device and an energy storage system, the battery device comprises a box body and a battery module, the box body is provided with an accommodating cavity, the box body is provided with a liquid inlet and a liquid return port, the liquid inlet is suitable for introducing a cooling medium, and the liquid return port is suitable for flowing out of the cooling medium; the battery module is mounted in the accommodating cavity, and the cooling medium is in direct contact with the battery module. Therefore, the cooling medium is directly introduced into the accommodating cavity, so that the cooling medium can be in direct contact with the battery module, the heat exchange area between the cooling medium and the battery module can be increased, the heat dissipation efficiency of the battery module is improved, and the operation stability of the battery module is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of energy storage, especially to a battery device and energy storage system. BACKGROUND

[0002] Under the background of the continuous growth of new energy industry index, electrochemical energy storage system technology is also maturing, but the energy storage power station still has the risk of frequent thermal runaway accidents, which affects the development of the energy storage power station. The main reason for the thermal runaway accident of the energy storage power station is that the lithium battery itself and the management system defect, the internal thermal runaway of the lithium battery, and the poor heat dissipation of charging and discharging. In the related art, the energy storage equipment adopts the air cooling mode for heat dissipation, and the heat dissipation efficiency is low, which easily affects the normal work of the energy storage system. SUMMARY

[0003] The utility model discloses at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery device, which can improve the heat dissipation efficiency of the battery module and ensure the operation stability of the battery module.

[0004] The battery device according to the utility model embodiment comprises a box body, the box body has a containing cavity, the box body is provided with a liquid inlet and a liquid return port, the liquid inlet is suitable for the cooling medium, and the liquid return port is suitable for the cooling medium. The battery module is installed in the containing cavity, and the cooling medium directly contacts the battery module.

[0005] According to the battery device of the utility model embodiment, the cooling medium is directly introduced into the containing cavity, so that the cooling medium can directly contact the battery module, the heat exchange area of the cooling medium and the battery module can be increased, the heat dissipation efficiency of the battery module can be improved, and the operation stability of the battery module is ensured.

[0006] According to the battery device of some embodiments of the utility model, the battery module comprises a plurality of battery sub-modules arranged in a stack along the up-down direction, and a flow guide space is formed above each battery sub-module; the battery box further comprises a flow guide piece, at least one flow guide space is provided with the flow guide piece, and the flow guide piece is provided with a liquid outlet channel for discharging the cooling medium towards the battery sub-module.

[0007] According to the battery device of some embodiments of the utility model, the flow guide piece comprises a first pipe section and a plurality of second pipe sections in communication, the first pipe section extends along one side edge of the battery sub-module and is in communication with the liquid inlet pipe, a plurality of second pipe sections are arranged in the flow guide space along the length direction of the first pipe section and are spaced apart, and the second pipe section is provided with the liquid outlet channel.

[0008] According to the battery device of some embodiments of the utility model, the liquid outlet channel is a plurality of shunt holes arranged at intervals.

[0009] The battery device according to some embodiments of the present application, in the direction away from the first pipe section, the diameter of the plurality of shunt holes on the same second pipe section gradually increases.

[0010] The battery device according to some embodiments of the present application, the second pipe section is arranged in the direction perpendicular to the first pipe section.

[0011] The battery device according to some embodiments of the present application, at least one end of the second pipe section is bent to form a clamping portion, and the clamping portion is limitedly matched with the side wall of the battery module.

[0012] The battery device according to some embodiments of the present application, the cross section of the first pipe section is formed into a quadrilateral and / or the cross section of the second pipe section is formed into a quadrilateral.

[0013] The battery device according to some embodiments of the present application, the second pipe section is matched with the side wall of the battery sub-module to be positioned in the battery sub-module.

[0014] The battery device according to some embodiments of the present application, a heat preservation member is arranged between the flow guide member and the side wall of the battery sub-module.

[0015] The battery device according to some embodiments of the present application, further comprising: a flow guide assembly, the flow guide assembly comprising a liquid inlet pipe and a liquid return pipe, the liquid inlet pipe being installed on one side of the battery module and being communicated with the liquid inlet, each flow guide member being communicated with the liquid inlet pipe, and the liquid return pipe being installed on one side of the battery module, the liquid return pipe being used to guide the cooling medium in each flow guide space to the liquid return port.

[0016] The battery device according to some embodiments of the present application, the liquid inlet pipe and the liquid return pipe are respectively located on opposite sides of the battery module; or, the liquid inlet pipe and the liquid return pipe are respectively located at diagonal positions of the battery module.

[0017] The battery device according to some embodiments of the present application, the liquid return pipe extends in the up-down direction, the lower end of the liquid return pipe is communicated with the liquid return port, and the liquid return pipe is respectively provided with a liquid return through hole corresponding to each flow guide space.

[0018] The battery device according to some embodiments of the present application, the maximum width of the flow guide space in the up-down direction is H1, the minimum distance between the side wall of the battery module opposite to the liquid return pipe and the liquid return through hole is H2, and the ratio of H1 / H2 ranges from 1.95 to 2.95.

[0019] According to the battery device of some embodiments of the present application, the hole diameter of the liquid return through hole is greater than the maximum width of the flow guide space in the up-down direction.

[0020] According to the battery device of some embodiments of the present application, the battery module further comprises a module bottom plate for supporting the battery sub-modules, the module bottom plate and the bottom of the box define a liquid return space, the liquid return space is communicated with the liquid return port, the module bottom plate is provided with a flow through hole, the flow through hole is used for guiding the cooling medium into the liquid return space, and the liquid return pipe is arranged in the module bottom plate and communicated with the liquid return space.

[0021] According to the battery device of some embodiments of the present application, the flow through hole is a plurality of, the liquid return pipe passes through one of the flow through holes to communicate with the liquid return space.

[0022] According to the battery device of some embodiments of the present application, the liquid inlet is arranged at the top of the box, and the liquid return port is arranged at the bottom of the box.

[0023] The utility model also proposes a kind of energy storage system.

[0024] According to the energy storage system of the utility model embodiment, including the battery device according to any one of the above embodiments.

[0025] The energy storage system and the battery device have the same advantages compared with prior art, which will not be repeated here.

[0026] Additional aspects and advantages of the present application will be described in part in the following description, and some will become apparent from the following description, or be understood by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

[0028] Figure 1 is the schematic diagram of the battery device according to the utility model embodiment;

[0029] Figure 2 is the explosion diagram of the battery device according to the utility model embodiment;

[0030] Figure 3 is the installation top view of the battery cluster according to the utility model embodiment;

[0031] Figure 4 is the installation schematic diagram of the liquid inlet pipe according to the utility model embodiment;

[0032] Figure 5This is a schematic diagram of the installation of the return pipe according to an embodiment of the present utility model;

[0033] Figure 6 This is a schematic diagram of a flow guide according to an embodiment of the present utility model;

[0034] Figure 7 This is a schematic diagram of the module base plate according to an embodiment of the present utility model;

[0035] Figure 8 yes Figure 5 A magnified view of a section at point A in the middle;

[0036] Figure 9 This is an installation diagram of the guide component according to an embodiment of the present utility model;

[0037] Figure 10 This is an exploded view of the installation of the guide component according to an embodiment of the present utility model;

[0038] Figure 11 This is a schematic diagram of a flow guide according to another embodiment of the present invention;

[0039] Figure 12 This is a schematic diagram of a flow guide according to another embodiment of the present invention.

[0040] Figure label:

[0041] Battery device 100,

[0042] Box 1, Box body 11, Top cover 12, Receiving cavity 13, Liquid inlet 14, Liquid outlet 15,

[0043] Battery module 2, module frame 21, battery sub-module 22, module base plate 23, flow passage 231, flow notch 232, flow guiding space 24, and electrolyte return space 25.

[0044] Flow guide 3, first pipe section 31, second pipe section 32, locking part 322, liquid outlet channel 33, diversion hole 331.

[0045] Flow guiding assembly 4, inlet pipe 41, return pipe 42, return through hole 421,

[0046] 5. Connecting hose; 6. Insulation component; 7. Clamp. Detailed Implementation

[0047] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0048] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0049] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0050] Hereinafter, with reference to the accompanying drawings, a battery device 100 according to an embodiment of the present invention will be described.

[0051] like Figures 1-12 As shown, the battery device 100 according to an embodiment of the present utility model includes: a housing 1 and a battery module 2. The housing 1 has a receiving cavity 13. The housing 1 is provided with a liquid inlet 14 and a liquid return outlet 15. The liquid inlet 14 is suitable for introducing a cooling medium, and the liquid return outlet 15 is suitable for flowing out a cooling medium. The battery module 2 is installed in the receiving cavity 13, and the cooling medium is in direct contact with the battery module 2.

[0052] Therefore, the battery module 2 can be sufficiently cooled by the cooling medium to improve the heat dissipation efficiency of the battery module 2, thereby ensuring the operational stability of the battery device 100.

[0053] First, such as Figures 1-5As shown, the battery device 100 includes a housing 1 and a battery module 2. The housing 1 includes a main body 11 and a top cover 12. An upwardly opening receiving cavity 13 is formed within the main body 11. The top cover 12 covers the main body 11 and seals the open end of the receiving cavity 13. The main body 11 is provided with an inlet 14 and a return outlet 15, which are used to communicate with an external flow path. The inlet 14 is adapted to allow cooling medium to flow into the receiving cavity 13, and the return outlet 15 is adapted to allow cooling medium to flow out. The cooling medium can be a coolant. It should be noted that the battery submodule 22 can be a battery module, a combination of multiple battery cells, multiple cells bound together, a single battery cell, or other implementations; specific details are not limited here.

[0054] Specifically, the return port 15 and the inlet port 14 can be located on the same side wall of the main body 11 of the tank, so that the tank 1 can be more easily connected to the external flow path.

[0055] Battery module 2 is installed in the receiving cavity 13, and the cooling medium is in direct contact with battery module 2. It should be noted that the seal of battery module 2 can be set to IP68 to prevent the cooling medium from flowing into battery module 2. During actual operation, when battery module 2 generates heat due to charging and discharging, the external flow path can introduce cooling medium into the receiving cavity 13 through the liquid inlet 14. The cooling medium can flow within the receiving cavity 13 to fully exchange heat with battery module 2, and the cooled medium can flow out of the receiving cavity 13 through the liquid inlet 14 after heat exchange. Of course, the cooling medium can also be used to heat battery module 2, which will not be elaborated further here.

[0056] It is understandable that by directly contacting the cooling medium with the battery module 2, the heat exchange area between the cooling medium and the battery module 2 can be increased, which is beneficial to improving the heat dissipation efficiency of the battery module 2, thereby ensuring the operational stability of the battery module 2.

[0057] According to the battery device 100 of this utility model embodiment, by directly introducing the cooling medium into the receiving cavity 13, the cooling medium can directly contact the battery module 2, which can increase the heat exchange area between the cooling medium and the battery module 2, which is beneficial to improving the heat dissipation efficiency of the battery module 2, thereby ensuring the operational stability of the battery module 2.

[0058] In some embodiments of the present invention, such as Figure 1 As shown, the liquid inlet 14 can be set at the top of the tank 1, and the liquid return port 15 can be set at the bottom of the tank 1.

[0059] With the above configuration, when the cooling medium flows into the receiving cavity 13, the cooling medium can flow to the return port under the action of gravity, without the need for an additional drive pump, which simplifies the structure. In addition, the cooling medium flows downward at a high rate, which helps to improve the circulation speed of the cooling medium and thus increases the heat dissipation efficiency.

[0060] In some embodiments of the present invention, the battery module 2 includes a plurality of battery sub-modules 22 stacked in the vertical direction, and a flow guiding space 24 is formed above each battery sub-module 22; the battery housing 100 also includes a flow guiding member 3, and at least one flow guiding space 24 is provided with a flow guiding member 3, and the flow guiding member 3 is provided with a liquid outlet channel 33 for discharging cooling medium toward the battery sub-module 22.

[0061] For example, refer to Figures 1-5 As shown, the battery module 2 includes a module frame 21 and multiple battery sub-modules 22. The multiple battery sub-modules 22 are respectively mounted on the module frame 21 and stacked at intervals in the vertical direction. A flow guiding space 24 is formed above each battery sub-module 22. Specifically, adjacent battery sub-modules 22 are spaced apart so that a flow guiding space 24 can be formed between adjacent battery sub-modules 22. The uppermost battery sub-module 22 can be spaced apart from the top cover 12 to form a flow guiding space 24. It should be noted that the battery sub-module 22 can be a battery module, a combination of multiple battery cells, or multiple cells bound together, or a single battery cell, or other implementation forms, which are not limited here.

[0062] The battery device 100 also includes a flow guide 3. Each flow guide space 24 is equipped with a flow guide 3, which has a liquid outlet channel 33. The liquid outlet channel 33 is used to discharge the cooling medium flowing in from the liquid inlet 14 to the battery submodule 22, so that the cooling medium can flow along the flow guide space 24 to cool the battery submodule 22 from all directions. It should be emphasized that the flow guide 3 can be adapted to battery submodules 22 of different heights. Through the above settings, cooling dead zones can be eliminated, and the cooling effect of the cooling medium on the battery module 2 can be improved.

[0063] In some embodiments of this utility model, the flow guide 3 includes a first pipe section 31 and a plurality of second pipe sections 32 connected together. The first pipe section 31 extends along one side edge of the battery submodule 22 and is connected to the liquid inlet pipe 41. The plurality of second pipe sections 32 are arranged at intervals along the length direction of the first pipe section 31 and are located in the flow guide space 24. The second pipe section 32 is provided with a liquid outlet channel 33.

[0064] For example, refer to Figure 6 , Figure 9 and Figure 10As shown, the flow guide 3 includes a first pipe section 31 and a second pipe section 32. The first pipe section 31 is located on the side of the battery submodule 22 where the liquid inlet pipe 41 is provided and extends along the edge of that side. The first pipe section 31 is connected to the liquid inlet pipe 41 so that the liquid inlet pipe 41 can pass cooling medium into the first pipe section 31.

[0065] The second pipe section 32 is provided in multiple ways. The multiple second pipe sections 32 are arranged at intervals along the length direction of the first pipe section 31 and are respectively connected to the first pipe section 31. The second pipe section 32 extends into the flow guiding space 24 and is provided with a liquid outlet channel 33. The first pipe section 31 is used to pass cooling medium into the multiple second pipe sections 32 respectively, so that the cooling medium can be sprayed into the flow guiding space 24 from the liquid outlet channel 33.

[0066] It is understandable that by setting multiple second pipe sections 32, the cooling medium can be introduced into the flow space 24 together, thereby making the distribution of the cooling medium in the flow space 24 more uniform and improving the temperature uniformity of the battery submodule 22.

[0067] In some embodiments of this utility model, such as Figure 6 As shown, the liquid outlet channel 33 can be configured as multiple diversion holes 331, which are spaced apart along the length of the second pipe section 32. Alternatively, the liquid outlet channel 33 can be configured as a long, narrow through-hole; this invention does not impose any limitation on this. This allows the liquid outlet channel 33 to deliver the cooling medium more evenly into the guiding space 24, improving the temperature uniformity of the battery submodule 22.

[0068] In some embodiments of this utility model, the diameter of multiple diversion holes 331 on the same second pipe section 32 gradually increases in the direction away from the first pipe section 31.

[0069] It is understandable that the cooling medium in the second pipe section 32 gradually decreases in the direction away from the first pipe section 31. By setting the diameter of multiple diversion holes 331 on the same second pipe section 32 to gradually increase, the flow rate of the cooling medium flowing out of each diversion hole 331 can be similar, so that the distribution of the cooling medium in the guide space 24 is more uniform, which is beneficial to improving the temperature uniformity of the battery submodule 22.

[0070] In some embodiments of this utility model, such as Figure 6 As shown, the second pipe segment 32 can be arranged to extend along a direction perpendicular to the first pipe segment 31. This arrangement allows the second pipe segment 32 to more effectively cover the battery submodule 22, shortening its length, saving materials, reducing the overall weight of the guide component 3, and achieving a lightweight design.

[0071] Of course, this utility model is not limited to this, such as Figure 11As shown, the second pipe segment 32 can also be bent and extended so that the second pipe segment 32 can more fully cover the battery submodule 22.

[0072] In some embodiments of this utility model, the second pipe segment 32 cooperates with the side wall of the battery submodule 22 to position it on the battery submodule 22. In the specific installation process, the battery submodule 22 can be installed on the module frame 21 first, then the guide 3 can be placed on the upper side wall of the battery submodule 22, and then the battery submodule 22 can be installed on top of the guide 3, and so on, so as to realize the assembly of the battery module 2.

[0073] Understandably, when the flow guide 3 is installed on the upper side wall of the battery submodule 22, the second pipe section 32 can cooperate with the upper side wall of the battery submodule 22 to achieve positioning, which improves the installation accuracy and stability of the flow guide 3 and helps to improve the reliability of the battery device 100.

[0074] In some embodiments of this utility model, at least one end of the second pipe segment 32 is bent to form a locking portion 322, which engages with the side wall of the battery module 2 for limiting cooperation. For example, as... Figure 6 , Figure 9 and Figure 10 As shown, a second pipe segment 32 can be configured to penetrate the battery module 2 in a direction perpendicular to the first pipe segment 31, and both ends of the second pipe segment 32 can be bent upwards (or downwards) to form locking portions 322. The two locking portions 322 are used to limit and cooperate with the opposite sides of the battery module 2 respectively. This can prevent the second pipe segment 32 from shifting and improve the installation stability of the second pipe segment 32.

[0075] In some embodiments of this utility model, such as Figure 6 As shown, the cross-section of the first pipe section 31 can be formed into a quadrilateral. This makes it easier to connect the second pipe section 32 to the first pipe section 31, thus reducing the processing difficulty of the guide member 3.

[0076] In some embodiments of this utility model, such as Figure 6 As shown, the cross-section of the second pipe section 32 can be set to be quadrilateral. This increases the mating area between the second pipe section 32 and the battery submodule 22 bracket, which helps improve the installation stability of the second pipe section 32 and makes it easier to connect the second pipe section 32 to the first pipe section 31, thus reducing the processing difficulty of the flow guide 3.

[0077] Of course, this utility model is not limited to this, such as Figure 12 As shown, the second pipe section 32 can also be constructed as a circular pipe, an elliptical pipe, etc.

[0078] In some embodiments of this utility model, a heat insulation component 6 is provided between the flow guide 3 and the side wall of the battery submodule 22. The heat insulation component 6 can be made of heat-insulating materials such as rubber and foam. For example, Figure 6 As shown, the flow guide 3 is provided with a second pipe section 32 extending into the flow guide space 24. The heat insulation component 6 is plate-shaped. Each second pipe section 32 is provided with two heat insulation components 6. The two heat insulation components 6 are located on the upper and lower sides of the second pipe section 32 respectively, so as to separate the second pipe section 32 from the side wall of the battery submodule 22.

[0079] This prevents the flow guide 3 from directly contacting part of the sidewall of the battery submodule 22, which would otherwise cause a large local temperature difference in the battery submodule 22, thus ensuring the temperature uniformity of the battery submodule 22 and effectively protecting the battery submodule 22.

[0080] In some embodiments of this utility model, the battery device 100 of this embodiment further includes: a flow guiding component 4, which includes an inlet pipe 41 and a return pipe 42. The inlet pipe 41 is installed on one side of the battery module 2 and communicates with the inlet port 14. Each flow guiding component 3 is communicated with the inlet pipe 41. The return pipe 42 is installed on one side of the battery module 2 and is used to guide the cooling medium in each flow guiding space 24 to the return port 15.

[0081] For example, refer to Figure 5 As shown, the battery device 100 also includes a flow guiding assembly 4, which includes an inlet pipe 41 and a return pipe 42. The inlet pipe 41 is installed on one side of the battery module 2, such as on one side of the battery module 2 in the left-right or front-back direction. The inlet pipe 41 is connected to the inlet port 14, so that the external flow path can pass through the inlet port 14 into the inlet pipe 41 to allow the cooling medium to flow into the inlet pipe 41. Each flow guiding component 3 is connected to the inlet pipe 41, and the cooling medium flowing into the inlet pipe 41 can further flow into the flow guiding component 3. At the same time, the return pipe 42 can be installed on one side of the battery module 2, such as on one side of the battery module 2 in the left-right or front-back direction. The return pipe 42 is connected to the flow guiding space 24 and the return port 15, respectively. The return pipe 42 is used to guide the cooling medium in the flow guiding space 24 to the return port 15, so that the cooled medium after heat absorption can flow directly to the external flow path.

[0082] It should be noted that the battery module 2 is rectangular in shape, and the return pipe 42 and the inlet pipe 41 can be located on the same side of the battery module 2, or on adjacent sides, or on opposite sides. This utility model does not impose any restrictions on this.

[0083] During operation, when the battery module 2 generates heat during charging and discharging, the external flow path allows cooling medium to be introduced into the inlet pipe 41 through the inlet port 14. The cooling medium flows along the inlet pipe 41 and into multiple guide members 3. The cooling medium flowing into the guide members 3 can then flow out through the outlet channel 33 to the top wall of the battery module 2. The cooling medium can also flow in all directions along the guide space 24. Cooling medium flowing towards the return pipe 42 can flow directly to the return port 15, while the remaining cooling medium can flow downwards along the side wall of the battery module 2 into the return port 15, thus providing sufficient and uniform heat dissipation for the battery module 2. Of course, the cooling medium can also be used to heat the battery module 2, which will not be elaborated here.

[0084] It is understandable that by setting the inlet pipe 41, the cooling medium can be evenly distributed into each flow guide space 24 so that each battery submodule 22 can be fully cooled. Furthermore, by setting the return pipe 42, at least a portion of the cooling medium can be directly introduced into the return port 15, reducing the impact of the heated cooling medium on the remaining battery modules 2 and improving the overall temperature uniformity of the battery modules 2.

[0085] In some embodiments of this utility model, such as Figure 5 As shown, a return pipe 42 can be configured to extend vertically, with its lower end connected to the return port 15. Each return pipe 42 corresponding to a flow space 24 is provided with a return through hole 421, which communicates with the flow space 24, allowing the cooling medium within the flow space 24 to enter the return pipe 42 through the return through hole 421. It should be noted that the return pipe 42 being provided with a return through hole 421 corresponding to the flow space 24 means that the portion of the return pipe 42 corresponding to the flow space 24 has a return through hole 421. The return through hole 421 can be directly opposite the flow space 24 along the axial direction or not directly opposite it.

[0086] It is understandable that by setting the return pipe 42 to extend in the vertical direction, the required length of the return pipe 42 can be shortened, and the efficiency of the cooling medium flowing to the return port 15 can be improved. Furthermore, by setting the return pipe 42 to provide a return through hole 421 for each flow space 24, the speed at which the cooling medium in the flow space 24 flows into the return pipe 42 can be increased, thereby improving the heat dissipation effect of the battery device 100.

[0087] In some embodiments of this utility model, such as Figures 3-4As shown, the maximum width of the flow guiding space 24 along the vertical direction can be defined as H1, and the minimum distance between the sidewall of the battery module 2 opposite to the return pipe 42 and the return through hole 421 can be defined as H2. The ratio of H1 / H2 ranges from 1.95 to 2.95. It should be noted that H2 can represent the distance between the edge of the flow guiding space 24 and the return through hole 421. Specifically, the ratio of H1 to H2 can be 2, 2.1, 2.4, 2.5, 2.6, 2.8, 2.9, etc.

[0088] The above settings can avoid the problem of the preset distance between the return pipe 42 and the battery module 2 being too small and difficult to position, which helps to reduce the installation difficulty and ensures that the cooling medium in the guide space 24 can flow into the return pipe 42 stably and quickly, thus improving the design rationality of the battery sub-module 22.

[0089] In some embodiments of this utility model, the diameter of the return liquid through hole 421 can be set to be larger than the maximum width H1 of the flow guiding space 24 in the vertical direction. With the above setting, when there is an installation error between the return liquid pipe 42 and the battery module 2, the return liquid through hole 421 can still remain opposite to the flow guiding space 24, so that the cooling medium in the flow guiding space 24 can flow stably into the return liquid pipe 42, thereby improving the design rationality of the battery device 100.

[0090] In some embodiments of this utility model, the battery module 2 further includes a module base plate 23 for supporting the battery sub-module 22. The module base plate 23 and the bottom of the housing 1 define a return liquid space 25. The return liquid space 25 is connected to the return liquid port 15. The module base plate 23 is provided with a flow hole 231 for introducing the cooling medium into the return liquid space 25. The return liquid pipe 42 passes through the module base plate 23 and is connected to the return liquid space 25.

[0091] For example, such as Figure 4 and Figure 7 As shown, the battery module 2 also includes a module base plate 23, which is connected to the bottom of the module frame 21 and supports the battery sub-module 22, so that the bottommost battery sub-module 22 can maintain a certain buffer space with the bottom of the housing 1. The module base plate 23 is spaced apart from the bottom of the housing 1 to define the return liquid space 25. The module base plate 23 is provided with a flow notch 232 corresponding to the return liquid port 15, which is used to connect the return liquid space 25 with the return liquid port 15.

[0092] The module base plate 23 is also provided with a flow-through hole 231, which runs vertically through the module. The flow-through hole 231 connects the return liquid space 25 with the space above the module base plate 23, so that the cooling medium flowing downward along the outer wall of the battery module 2 can flow into the return liquid space 25 through the flow-through hole 231. At the same time, a return liquid pipe 42 can be provided, which passes through the module base plate 23 and is connected to the return liquid space 25, so that the cooling medium in the return liquid pipe 42 can flow into the return liquid space 25 along the return liquid pipe 42.

[0093] In other words, the cooling medium flowing downward along the outer wall of the battery module 2 and the cooling medium flowing downward along the return pipe 42 can merge in the return space 25. The merged cooling medium can flow together along the flow gap 232 and the return port 15 to the external flow path.

[0094] By implementing the above settings, turbulence can be eliminated, making the flow of the cooling medium more stable, increasing the flow rate of the cooling medium, and improving the heat dissipation efficiency of the battery device 100.

[0095] In some embodiments of this utility model, such as Figures 7-8 As shown, there can be multiple flow holes 231, which are spaced apart along the circumference of the module base plate 23. The return pipe 42 passes through one of the flow holes 231 to communicate with the return space 25. The diameter of the return pipe 42 is smaller than the diameter of the flow hole 231 so that the cooling medium can flow into the return space 25 from the gap between the return pipe 42 and the flow hole 231.

[0096] The above settings can increase the speed at which the cooling medium flows into the return space 25, improve the heat dissipation efficiency of the battery module 2, and make the installation of the return pipe 42 more convenient, thus saving processing costs.

[0097] In some embodiments of this utility model, such as Figures 2-3 As shown, the inlet pipe 41 and the return pipe 42 can be located on opposite sides of the battery module 2. This ensures that the cooling medium in the flow guide space 24 can flow through the entire battery sub-module 22, improving the temperature uniformity of the battery sub-module 22.

[0098] Furthermore, multiple return pipes 42 can be provided, arranged horizontally at intervals. This improves the flow efficiency of the cooling medium, enhances the heat dissipation efficiency of the battery module 2, and makes the flow of the cooling medium more uniform, thereby improving the temperature uniformity of the battery submodule 22.

[0099] In some other embodiments of this invention, the inlet pipe 41 and the return pipe 42 can be positioned diagonally opposite each other in the battery module 2. This ensures that the cooling medium in the flow guiding space 24 can flow through the entire battery submodule 22, improving the temperature uniformity of the battery submodule 22.

[0100] In some embodiments of this utility model, such as Figure 4 and Figure 8 As shown, the inlet pipe 41 and the return pipe 42 can be connected to the side wall of the battery module 2 via clamps 7. This improves the relative stability between the flow guiding assembly 4 and the battery module 2, and facilitates the flow stability of the cooling medium.

[0101] In some embodiments of this utility model, such as Figure 4 As shown, the liquid inlet 14 and the liquid inlet pipe 41 can be connected by a connecting hose 5. This arrangement reduces the difficulty of connecting the liquid inlet 14 and the liquid inlet pipe 41, making the liquid inlet pipe 41 easier to arrange, reducing the processing difficulty of the battery device 100, and thus reducing processing costs.

[0102] In some embodiments of this utility model, such as Figure 4 As shown, the liquid inlet pipe 41 and the flow guide 3 can be connected by a connecting hose 5. This arrangement reduces the difficulty of connecting the flow guide 3 and the liquid inlet pipe 41, making the liquid inlet pipe 41 easier to arrange, reducing the processing difficulty of the battery device 100, and thus reducing processing costs.

[0103] This utility model also proposes an energy storage system.

[0104] The energy storage system according to an embodiment of the present invention includes a battery device 100 according to any of the above embodiments. It should be noted that the energy storage system may include multiple battery devices 100, which may be connected in parallel or in series.

[0105] According to the energy storage system of this utility model embodiment, by directly introducing the cooling medium into the receiving cavity 13, the cooling medium can directly contact the battery module 2, which can increase the heat exchange area between the cooling medium and the battery module 2, which is conducive to improving the heat dissipation efficiency of the battery module 2, thereby ensuring the operational stability of the battery module 2 and improving the overall performance of the energy storage system.

[0106] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0107] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery device (100), characterized in that, include: The housing (1) has a receiving cavity (13), and the housing (1) is provided with a liquid inlet (14) and a liquid return outlet (15). The liquid inlet (14) is adapted to allow the cooling medium to flow in, and the liquid return outlet (15) is adapted to allow the cooling medium to flow out. The battery module (2) is installed in the cavity (13), and the cooling medium is in direct contact with the battery module (2). The battery module (2) includes multiple battery sub-modules (22) stacked in the vertical direction, and a flow guiding space (24) is formed above each battery sub-module (22). The guide (3) is provided in at least one of the guide spaces (24), and the guide (3) is provided with an outlet channel (33) for discharging the cooling medium toward the battery submodule (22).

2. The battery device (100) according to claim 1, characterized in that, The flow guide (3) includes a first pipe section (31) and a plurality of second pipe sections (32) connected together. The first pipe section (31) extends along one side edge of the battery submodule (22) and is connected to the liquid inlet pipe (41). The plurality of second pipe sections (32) are arranged at intervals along the length direction of the first pipe section (31) and are located in the flow guide space (24). The second pipe sections (32) are provided with the liquid outlet channel (33).

3. The battery device (100) according to claim 2, characterized in that, The liquid outlet channel (33) consists of multiple spaced-apart diversion holes (331).

4. The battery device (100) according to claim 3, characterized in that, In the direction away from the first pipe segment (31), the diameter of the plurality of diversion holes (331) on the same second pipe segment (32) gradually increases.

5. The battery device (100) according to claim 2, characterized in that, The second pipe segment (32) extends in a direction perpendicular to the first pipe segment (31).

6. The battery device (100) according to claim 2, characterized in that, The second pipe section (32) engages with the side wall of the battery submodule (22) to be positioned on the battery submodule (22).

7. The battery device (100) according to claim 6, characterized in that, At least one end of the second pipe section (32) is bent to form a locking part (322), which is engaged with the side wall of the battery module (2).

8. The battery device (100) according to claim 2, characterized in that, The first pipe segment (31) has a quadrilateral cross-section and / or the second pipe segment (32) has a quadrilateral cross-section.

9. The battery device (100) according to claim 1, characterized in that, A heat insulation component (6) is provided between the flow guide (3) and the side wall of the battery submodule (22).

10. The battery device (100) according to claim 1, characterized in that, Also includes: The flow guiding assembly (4) includes an inlet pipe (41) and a return pipe (42). The inlet pipe (41) is installed on one side of the battery module (2) and communicates with the inlet port (14). Each flow guiding component (3) is communicated with the inlet pipe (41). The return pipe (42) is installed on one side of the battery module (2) and is used to guide the cooling medium in each flow guiding space (24) to the return port (15).

11. The battery device (100) according to claim 10, characterized in that, The inlet pipe (41) and the return pipe (42) are located on opposite sides of the battery module (2); or, the inlet pipe (41) and the return pipe (42) are located at opposite corners of the battery module (2).

12. The battery device (100) according to claim 10, characterized in that, The return pipe (42) extends in the vertical direction, and the lower end of the return pipe (42) is connected to the return port (15). The return pipe (42) is provided with a return through hole (421) for each of the flow guiding spaces (24).

13. The battery device (100) according to claim 12, characterized in that, The maximum width of the flow guide space (24) in the vertical direction is H1, the minimum distance between the side wall of the battery module (2) and the return pipe (42) and the return through hole (421) is H2, and the ratio of H1 / H2 is in the range of 1.95-2.

95.

14. The battery device (100) according to claim 12, characterized in that, The diameter of the return liquid through hole (421) is greater than the maximum width of the flow guiding space (24) in the vertical direction.

15. The battery device (100) according to claim 12, characterized in that, The battery module (2) also includes a module base plate (23) for supporting the battery sub-module (22). The module base plate (23) and the bottom of the housing (1) define a return space (25). The return space (25) is connected to the return port (15). The module base plate (23) is provided with a flow hole (231). The flow hole (231) is used to introduce the cooling medium into the return space (25). The return pipe (42) passes through the module base plate (23) and is connected to the return space (25).

16. The battery device (100) according to claim 15, characterized in that, There are multiple flow holes (231), and the return pipe (42) passes through one of the flow holes (231) to communicate with the return space (25).

17. The battery device (100) according to any one of claims 1-16, characterized in that, The liquid inlet (14) is located at the top of the box (1), and the liquid return port (15) is located at the bottom of the box (1).

18. An energy storage system comprising a battery device (100) according to any one of claims 1-17.

Images