Battery energy storage device

Abstract

The utility model discloses battery energy storage equipment which comprises a shell, a refrigerating unit and a direct cooling plate assembly, a containing space is formed in the shell and can be used for containing a battery, the refrigerating unit and the direct cooling plate assembly are arranged in the containing space, the refrigerating unit is used for adjusting the temperature of the battery, and the direct cooling plate assembly is used for adjusting the temperature of the battery. The direct cooling plate assembly and the refrigerating unit are connected through a refrigerant circulation pipeline to form a refrigerant circulation loop, the direct cooling plate assembly comprises a direct cooling plate, a plurality of limiting parts and a fixing part, the direct cooling plate is used for heat exchange with a battery, the limiting parts are at least connected to the two opposite ends of the direct cooling plate and used for limiting the battery, and the fixing part is used for fixing the battery. And the fixing piece is connected with the direct cooling plate and is used for fixing the battery on the direct cooling plate, so that the connection stability between the battery and the direct cooling plate is improved, the battery is prevented from shifting, and the continuous and stable heat exchange effect between the battery and the direct cooling plate is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage temperature control, in particular to a battery energy storage device. BACKGROUND

[0002] The battery energy storage device is a device that realizes energy storage and release through electrochemical reaction. At present, the battery energy storage device mainly includes air-cooled and liquid-cooled types. Compared with the air-cooled battery energy storage device, the liquid-cooled battery energy storage device can realize rapid heat dissipation and heat conduction, improve temperature control efficiency, and reduce the generation of out-of-control phenomenon, so liquid cooling gradually becomes the main means of energy storage temperature control.

[0003] The current energy storage liquid cooling technology realizes temperature control of lithium ion batteries through a liquid cooling unit. After cold and heat conversion of the refrigeration unit, the secondary heat exchange of the water system is performed, and the water temperature of 18℃ is taken as the control target to cool or heat the lithium battery liquid cooling plate. The above-mentioned liquid cooling technology has slow heating speed, poor cell temperature uniformity, low energy conversion efficiency, and high system cost. With the development of energy storage battery technology, high-capacity cells are gradually applied, and the installed density of the energy storage system is gradually improved, which requires higher capacity of the refrigeration unit. Large air volume and large cooling capacity of the energy storage device are required, and the existing liquid-cooled energy storage device cannot meet the development needs of the energy storage battery technology. CONTENT OF THE INVENTION

[0004] In view of the above-mentioned deficiencies of the prior art, the purpose of the present application is to provide a battery energy storage device, which aims to improve the heat exchange efficiency of the battery energy storage device.

[0005] Another purpose of the present application can be to improve the installation convenience of the battery.

[0006] Still another purpose of the present application can be to improve the connection stability between the battery and the direct cooling plate.

[0007] The problems of the present application are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

[0008] In order to achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0009] In one aspect, the present application discloses a battery energy storage device, comprising a shell, a refrigeration unit and a direct cooling plate assembly. The interior of the shell forms a containing space, which can be used to place a battery. The refrigeration unit is arranged in the containing space and is used to adjust the temperature of the battery. The direct cooling plate assembly is arranged in the containing space, and the direct cooling plate assembly and the refrigeration unit are connected through the refrigerant circulation pipeline to form a refrigerant circulation loop.

[0010] The straight cooling plate assembly comprises a straight cooling plate, a limiting piece and a fixing piece, the straight cooling plate is used for heat exchange with the battery, the limiting piece is configured with a plurality of limiting pieces, the plurality of limiting pieces are arranged at least at opposite ends of the straight cooling plate, and the limiting piece is used for limiting the battery, and the fixing piece is connected with the straight cooling plate and is used for fixing the battery on the straight cooling plate. In the above, the straight cooling plate is provided with a plurality of limiting pieces, the battery can be connected between the plurality of limiting pieces on the straight cooling plate, the limiting piece can limit the battery, when the battery is mounted on the straight cooling plate, the limiting piece prepositions the battery, and then the fixing piece is fixed on the straight cooling plate, thereby improving the convenience of the battery installation and the connection stability between the battery and the straight cooling plate.

[0011] In some embodiments of the application, the opposite ends of the straight cooling plate are respectively provided with the limiting pieces, and the limiting pieces are located on the side of the straight cooling plate for mounting the battery. When the battery is mounted on the straight cooling plate, the limiting pieces at the two ends of the straight cooling plate can limit the end portions of the battery respectively, thereby quickly realizing the positioning of the battery.

[0012] In some embodiments of the application, the limiting piece is protruded on the side of the straight cooling plate for mounting the battery and can abut against the end portion of the battery, the limiting piece is provided with a mounting hole, and the fixing piece is arranged in the mounting hole to fix the battery on the limiting piece. The space for mounting the battery is formed between the plurality of limiting pieces protruded on the straight cooling plate, the battery is clamped into the space and abuts against the limiting piece to realize prepositioning, after positioning, the battery is connected to the limiting piece through the fixing piece, thereby realizing the quick positioning and fixing between the battery and the straight cooling plate, preventing the battery from shifting, improving the contact stability between the battery and the straight cooling plate, and ensuring the heat exchange efficiency.

[0013] In some embodiments of the application, the straight cooling plate is formed with a refrigerant flow path, the refrigerant flow path comprises a refrigerant inlet and a refrigerant outlet; the straight cooling plate assembly further comprises a pressing plate structure connected to the straight cooling plate and located outside the limiting piece, and the pressing plate structure is in communication with the refrigerant inlet and the refrigerant outlet respectively to connect the refrigerant flow path and the refrigerant circulation pipeline. Through the pressing plate structure, the refrigerating unit, the refrigerant circulation pipeline and the refrigerant flow path on the straight cooling plate can form a refrigerant circulation loop to realize continuous heat exchange with the battery.

[0014] In some embodiments of the present application, the refrigerant inlet and the refrigerant outlet are arranged in the middle of one end of the direct cooling plate. The refrigerant inlet is arranged in the middle of one end of the direct cooling plate, so that the refrigerant entering the refrigerant flow path on the direct cooling plate can extend from the middle to both sides, forming a parallel flow path structure and improving the heat exchange efficiency of the direct cooling plate. The refrigerant outlet is arranged in the middle of one end of the direct cooling plate, and the refrigerant outlet and the refrigerant inlet are arranged close to each other, which is convenient for the layout of the pipeline.

[0015] In some embodiments of the present application, the pressing plate structure includes a bottom plate, a liquid inlet connector and a liquid outlet connector. The bottom plate is arranged on the direct cooling plate, and the bottom plate forms a liquid inlet channel and a liquid outlet channel. The liquid inlet channel is in communication with the refrigerant inlet, and the liquid outlet channel is in communication with the refrigerant outlet. The liquid inlet connector is connected to the side of the bottom plate away from the direct cooling plate. The liquid inlet connector is provided with a liquid inlet pipe section, and the liquid inlet pipe section is arranged close to the limiting piece. The liquid inlet pipe section is connected to the liquid inlet channel and the refrigerant circulation pipeline respectively, and the liquid inlet pipe section and the refrigerant circulation pipeline are connected to one end of the liquid inlet connector away from the bottom plate. The liquid outlet connector is connected to the side of the bottom plate away from the direct cooling plate. The liquid outlet connector is provided with a liquid outlet pipe section, and the liquid outlet pipe section is arranged close to the limiting piece. The liquid outlet pipe section is connected to the liquid outlet channel and the refrigerant circulation pipeline respectively, and the liquid outlet pipe section and the refrigerant circulation pipeline are connected to one end of the liquid outlet connector away from the bottom plate. The liquid inlet connector and the liquid outlet connector are connected to the refrigerant circulation pipeline respectively, so that the refrigerant in the direct cooling plate can enter the refrigeration unit heat exchange through the refrigerant circulation pipeline, and then enter the direct cooling plate, realizing the continuous heat exchange effect of the direct cooling plate and the battery. The liquid inlet connector and the liquid outlet connector are connected to the side away from the bottom plate, which is convenient for the connection of the refrigerant circulation pipeline. The liquid inlet pipe section and the liquid outlet pipe section are arranged close to the limiting piece respectively, that is, the liquid inlet pipe section is arranged on the inner side of the liquid inlet connector, and the liquid outlet pipe section is arranged on the inner side of the liquid outlet connector, so that the connecting piece can be arranged on the outer side of the liquid inlet connector and the liquid outlet connector to fix them to the direct cooling plate, avoiding the influence of the liquid inlet pipe section and the liquid outlet pipe section, and facilitating the installation of the pressing plate structure.

[0016] In some embodiments of the present application, the inlet pipe section is sleeved with at least two first sealing rings at one end connected with the inlet channel, and the second sealing ring is located between the outlet pipe section and the outlet channel. The first sealing ring forms a two-stage sealing structure between the inlet plug connector and the inlet channel, and the second sealing ring forms a two-stage sealing structure between the outlet plug connector and the outlet channel, thereby improving the sealing performance of the pressing plate structure.

[0017] In some embodiments of the present application, a distribution flow channel is formed on the bottom plate, the distribution flow channel is in communication with the outlet channel, and the outlet of each of the plurality of groups of refrigerant flow paths is in communication with the distribution flow channel. The outlet of each of the plurality of groups of refrigerant flow paths is in communication with the distribution flow channel, that is, the refrigerant in the plurality of groups of refrigerant flow paths can converge in the distribution flow channel and then enter the refrigerant circulation pipeline from the outlet channel, thereby reducing the number of pipelines.

[0018] In some embodiments of the present application, the direct cooling plate comprises a first sub-plate and a second sub-plate, the first sub-plate and the second sub-plate are stacked, the first sub-plate is configured as a flat plate, the refrigerant flow path is formed on the second sub-plate and protrudes towards the first sub-plate. The battery is connected to the first sub-plate, the first sub-plate is configured as a flat plate, which can increase the contact area between the battery and the first sub-plate and ensure the heat exchange efficiency between the direct cooling plate and the first sub-plate. The refrigerant flow path protrudes towards the first sub-plate, which reduces the distance between the refrigerant and the first sub-plate and improves the heat exchange effect between the refrigerant flow path and the first sub-plate.

[0019] In some embodiments of the present application, the first sub-plate is provided with an insulating heat-conducting adhesive layer on the side away from the second sub-plate. The insulating heat-conducting adhesive has good heat conduction and heat dissipation performance, which can improve the heat exchange effect between the battery and the first sub-plate.

[0020] Advantages:

[0021] According to at least one of the embodiments of the present application, the direct cooling plate is provided with a plurality of limiting members, and when the battery is connected to the direct cooling plate, the limiting members can limit the battery, thereby achieving rapid positioning of the battery and improving the convenience of battery installation.

[0022] According to at least one of the embodiments of the present application, the battery is fixed to the direct cooling plate by the fixing member, which can prevent the battery from shifting and improve the connection stability between the battery and the direct cooling plate.

[0023] According to at least one of the embodiments of the present application, the stable connection between the battery and the direct cooling plate ensures that the battery can be connected to the preset position on the direct cooling plate, thereby ensuring the stability of the direct cooling plate for heat exchange with the battery.

[0024] The effects of the present application are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A structural schematic diagram of a battery energy storage device according to an embodiment of the present application is provided.

[0026] Figure 2 A connection structure schematic diagram of a battery and a direct cooling plate assembly according to an embodiment of the present application is provided.

[0027] Figure 3 A structural schematic diagram of a direct cooling plate assembly according to an embodiment of the present application is provided.

[0028] Figure 4 A structural schematic diagram of a direct cooling plate assembly according to an embodiment of the present application is provided.

[0029] Figure 5 A structural schematic diagram of a pressing plate structure according to an embodiment of the present application is provided.

[0030] Figure 6 A structural schematic diagram of a pressing plate structure according to an embodiment of the present application is provided.

[0031] Figure 7 A Figure 6 A sectional view along the direction of E-E.

[0032] Figure 8 A Figure 6 A sectional view along the direction of F-F.

[0033] Figure 9 A structural schematic diagram of a bottom plate according to an embodiment of the present application is provided.

[0034] Figure 10 A structural schematic diagram of a bottom plate according to an embodiment of the present application is provided.

[0035] Figure 11 A structural schematic diagram of a liquid inlet plug connector according to an embodiment of the present application is provided.

[0036] Main element symbol explanation: 1 - shell; 11 - containing space; 2 - battery; 3 - refrigeration unit; 4 - direct cooling plate assembly; 41 - direct cooling plate; 411 - refrigerant flow path; 4111 - refrigerant inlet; 4112 - refrigerant outlet; 412 - battery placement area; 413 - first sub-plate; 414 - second sub-plate; 42 - limiting piece; 421 - mounting hole; 43 - fixing piece; 44 - pressing plate structure; 441 - bottom plate; 4411 - liquid inlet channel; 4412 - liquid outlet channel; 4413 - liquid distribution flow channel; 442 - liquid inlet plug connector; 4421 - liquid inlet pipe section; 443 - liquid outlet plug connector; 4431 - liquid outlet pipe section; 444 - first sealing ring; 445 - second sealing ring; 5 - refrigerant circulation pipeline. DETAILED DESCRIPTION

[0037] The present application provides a battery energy storage device. In order to make the purpose, technical scheme and effect of the present application more clear and explicit, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0038] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate 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, and a particular orientation configuration and operation, therefore, it cannot be understood as a limitation on the present application. In addition, "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0039] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection or can communicate with each other; it can be direct connection, or indirect connection through intermediate medium, it can be the communication or interaction relationship between 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.

[0040] The present application provides a battery energy storage device. The battery energy storage device can be a commercial energy storage cabinet. The following describes the present application as a commercial energy storage cabinet.

[0041] Figure 1A structural schematic diagram of a battery energy storage device provided by an embodiment of the present application.

[0042] In some embodiments of the present application, referring to Figure 1 The industrial and commercial energy storage cabinet includes a shell 1. The shell 1 can include a cabinet body. The cabinet body can be formed with a receiving space 11. The receiving space 11 can include a battery compartment and an air conditioner compartment.

[0043] The battery compartment and the air conditioner compartment are separated into independent storage rooms by a partition. The battery compartment can be used to place batteries 2. The batteries 2 are configured as energy storage batteries 2 that can store and release energy. The batteries 2 are arranged in the battery compartment in the form of a battery cluster.

[0044] The cabinet body is formed with an opening that communicates with the receiving space 11. The shell 1 includes a cabinet door that is connected to the cabinet body to close the opening of the cabinet body. One side of the cabinet door can be rotatably installed on the cabinet body. For example, a hinge member is connected to the cabinet body.

[0045] In some embodiments of the present application, the industrial and commercial energy storage cabinet further includes a refrigeration unit 3. The refrigeration unit 3 can be placed in the air conditioner compartment. The refrigeration unit 3 can exchange heat with the batteries 2 to adjust the temperature of the batteries 2.

[0046] In some embodiments of the present application, the refrigeration unit 3 can be a direct-cooling unit. The use of a refrigerant direct-cooling technology reduces heat exchange loss, makes the system more energy efficient, and reduces costs. In addition, the use of a design without water circulation avoids the risk of liquid leakage, and the unit has a smaller volume and lower noise, can provide greater cooling capacity in limited space, and is suitable for the development trend of increasing energy density of energy storage systems, which can be beneficial to the development trend of increasingly smaller space.

[0047] In some embodiments, the refrigeration unit 3 can use a vertical direct-cooling module. The vertical direct-cooling module has a smaller footprint and is suitable for use in situations where the installation space is limited.

[0048] In other embodiments, the refrigeration unit 3 can use a horizontal direct-cooling module. The horizontal direct-cooling module is flexible to install and can be placed directly on the ground, which is convenient for cleaning and maintenance. In addition, since the horizontal direct-cooling module can be placed on the ground, the heat dissipation effect is good, which is conducive to the dissipation of heat and the stable operation of the system.

[0049] For example, Figure 1As shown, in some embodiments of the present application, the industrial and commercial energy storage cabinet comprises a direct cooling plate assembly 4. The direct cooling plate assembly 4 is arranged in the accommodation space 11. The direct cooling plate assembly 4 is arranged in the battery compartment. The direct cooling plate assembly 4 is connected with the refrigerating unit 3 through the refrigerant circulation pipeline 5 to form a refrigerant circulation loop. After heat exchange with the refrigerating unit 3, the refrigerant enters the direct cooling plate assembly 4 to exchange heat with the battery 2, and then enters the refrigerating unit 3 through the refrigerant circulation pipeline 5, so as to realize the temperature regulation of the battery 2 by the refrigerating unit 3.

[0050] Figure 2 The connection structure diagram of the battery and the direct cooling plate assembly provided by the present application is shown. Figure 3 The structure diagram of the direct cooling plate assembly from the first perspective provided by the present application is shown. Figure 4 The structure diagram of the direct cooling plate assembly from the second perspective provided by the present application is shown.

[0051] As shown, Figures 2 to 4 Further, the direct cooling plate assembly 4 comprises a direct cooling plate 41. The battery 2 is arranged on the upper surface of the direct cooling plate 41 and can exchange heat with the direct cooling plate 41 to maintain the normal operating temperature range.

[0052] In some embodiments of the present application, the direct cooling plate 41 is formed with a refrigerant flow path 411. The refrigerant flow path 411 extends at opposite ends of the direct cooling plate 41. The refrigerant flow path 411 forms a serpentine structure and is spaced apart to ensure the heat exchange effect with the battery 2.

[0053] In some embodiments of the present application, the direct cooling plate 41 can comprise a first sub-plate 413 and a second sub-plate 414, and the first sub-plate 413 and the second sub-plate 414 are arranged in layers.

[0054] The first sub-plate 413 can be configured as a flat plate. The battery 2 is fixed on the side of the first sub-plate 413 away from the second sub-plate 414. The first sub-plate 413 is arranged as a flat plate, so that the battery 2 can be more closely connected to the surface of the first sub-plate 413, thereby increasing the contact area between the first sub-plate 413 and the battery 2 and improving the heat exchange efficiency between the direct cooling plate 41 and the first sub-plate 413.

[0055] The refrigerant flow path 411 is formed on the second sub-plate 414. The refrigerant flow path 411 is arranged protruding towards the first sub-plate 413, which reduces the distance between the refrigerant and the first sub-plate 413 and improves the heat exchange effect between the refrigerant flow path 411 and the first sub-plate 413.

[0056] In some embodiments of the present application, the side of the first sub-plate 413 away from the second sub-plate 414 is provided with an insulating heat-conducting adhesive layer (not shown in the figure). The insulating heat-conducting adhesive has good heat-conducting and heat-dissipating performance, which can improve the heat exchange rate between the battery 2 and the first sub-plate 413, thereby improving the stability of the operating temperature of the battery 2.

[0057] In some embodiments, the second sub-plate 414 is a stamped plate. The height of the refrigerant flow path 411 is 1.8 to 3 mm. Specifically, the height of the refrigerant flow path 411 can be, but is not limited to, 1.8 mm, 2.0 mm, 2.5 mm, or 3.0 mm. Setting the height of the refrigerant flow path 411 to this height ensures sufficient refrigerant flow and cooling efficiency.

[0058] The refrigerant flow path 411 includes a refrigerant inlet 4111 and a refrigerant outlet 4112. The refrigerant flowing out of the refrigeration unit 3 enters the direct cooling plate 41 through the refrigerant inlet 4111 and flows out of the direct cooling plate 41 through the refrigerant outlet 4112 and returns to the refrigeration unit 3.

[0059] like Figure 4 As shown, in some embodiments of the present application, the refrigerant inlet 4111 is disposed in the middle of one end of the direct cooling plate 41. The refrigerant inlet 4111 is disposed in the middle of one end of the second sub-plate 414. This allows the refrigerant flow path 411 on the direct cooling plate 41 to extend from the center to both sides, forming a parallel flow path structure, thereby improving the heat exchange efficiency of the direct cooling plate 41.

[0060] Refrigerant outlet 4112 is located in the middle of one end of direct cooling plate 41. Refrigerant outlet 4112 and refrigerant inlet 4111 are located on the same side of direct cooling plate 41. The proximity of refrigerant outlet 4112 to refrigerant inlet 4111 reduces steric resistance between the refrigerant inlet 4111 and refrigerant outlet 4112, facilitating the layout of refrigerant circulation pipeline 5 connecting refrigerant inlet 4111 and refrigerant outlet 4112.

[0061] like Figures 2 to 4 As shown, in some embodiments of the present application, the direct cooling plate assembly 4 includes a stopper 42. Multiple stoppers 42 may be provided. Multiple stoppers 42 are provided at least at opposite ends of the direct cooling plate 41 to limit the position of the battery 2. This allows the battery 2 to be quickly positioned at a predetermined position on the direct cooling plate 41 during installation, thereby improving installation convenience between the battery 2 and the direct cooling plate 41.

[0062] To improve the connection stability between the direct cooling plate 41 and the battery 2 and prevent the battery 2 from shifting, the direct cooling plate assembly 4 also includes a fixing member 43. The fixing member 43 is connected to the direct cooling plate 41, and when the battery 2 is installed on the direct cooling plate 41, the fixing member 43 can be connected to the battery 2, thereby ensuring that the battery 2 can be stably installed on the direct cooling plate 41.

[0063] In some embodiments, stoppers 42 are disposed at opposite ends of the direct cooling plate 41. The stoppers 42 are located on the side of the direct cooling plate 41 where the battery 2 is mounted. A battery placement area is formed between the two stoppers 42. When the battery 2 is mounted on the direct cooling plate 41, it is secured to the battery placement area. The end portions of the battery 2 are held in place by the stoppers 42 at predetermined positions on the direct cooling plate 41, thereby securing the battery 2 and facilitating installation.

[0064] In some embodiments, the limiting member 42 is protruded from one side of the direct cooling plate 41 for mounting the battery 2, and one end of the battery 2 abuts against one of the limiting members 42, and the other end of the battery 2 abuts against the other limiting member 42, so that the battery 2 can be clamped between the two limiting members 42.

[0065] The retaining member 42 is provided with a mounting hole 421. Each retaining member 42 may be provided with multiple mounting holes 421. The multiple mounting holes 421 are distributed along the extension direction of the retaining member 42. The fixing member 43 is inserted into the mounting hole 421. The portion of the fixing member 43 extending out of the mounting hole 421 can be connected to the battery 2, thereby securing the battery 2 to the retaining member 42 and improving the connection stability between the battery 2 and the retaining member 42. The fixing member 43 can be a fixing screw, which has a simple structure and high connection reliability.

[0066] When battery 2 is mounted on direct cooling plate 41, it snaps into the battery placement area on the plate, and retaining members 42 abut against the ends of battery 2, pre-positioning battery 2. Once positioned, battery 2 is then secured to retaining members 42 via retaining members 43, quickly positioning and securing battery 2 to direct cooling plate 41. This prevents displacement of battery 2 and improves contact stability between the two, ensuring effective heat exchange.

[0067] like Figures 2 to 4 As shown, the direct cooling plate assembly 4 includes a pressure plate structure 44. The pressure plate structure 44 can serve as a connecting structure between the direct cooling plate 41 and the refrigerant circulation pipeline 5. The pressure plate structure 44 is connected to the direct cooling plate 41 and is located on the outside of the limiter 42. The pressure plate structure 44 is respectively connected to the refrigerant inlet 4111 and the refrigerant outlet 4112 to connect the refrigerant flow path 411 with the refrigerant circulation pipeline 5. Through the pressure plate structure 44, the refrigeration unit 3, the refrigerant circulation pipeline 5 and the refrigerant flow path 411 on the direct cooling plate 41 form a refrigerant circulation loop. The refrigerant on the direct cooling plate 41 after heat exchange with the battery 2 passes through the refrigerant circulation pipeline 5 and enters the refrigeration unit 3. After heat exchange with the refrigeration unit 3, it re-enters the direct cooling plate 41 to achieve continuous heat exchange with the battery 2.

[0068] Figure 5 This is a schematic structural diagram of the pressure plate structure provided in this application from the first perspective; Figure 6 This is a structural schematic diagram of the pressure plate structure provided in this application from a second perspective.Figure 7 As Figure 6 A sectional view along the direction of E-E. Figure 8 As Figure 6 A sectional view along the direction of F-F. Figure 9 As

[0069] As Figures 5 to 9 shown, in some embodiments of the present application, the pressing plate structure 44 comprises a bottom plate 441. The bottom plate 441 is fixed on the direct cooling plate 41. The bottom plate 441 is fixed on one side of the direct cooling plate 41 for mounting the battery 2. The bottom plate 441 can be welded on the direct cooling plate 41 to improve the sealing between the bottom plate 441 and the direct cooling plate 41.

[0070] The bottom plate 441 can be formed with an inlet liquid passage 4411 and an outlet liquid passage 4412. The inlet liquid passage 4411 is in communication with the refrigerant inlet 4111, and the outlet liquid passage 4412 is in communication with the refrigerant outlet 4112.

[0071] As Figures 6 to 8 shown, in some embodiments of the present application, the pressing plate structure 44 further comprises an inlet liquid connector 442 and an outlet liquid connector 443.

[0072] The inlet liquid connector 442 can be connected to the side of the bottom plate 441 away from the direct cooling plate 41. The inlet liquid connector 442 is provided with an inlet liquid pipe section 4421, and the inlet liquid pipe section 4421 is connected to the inlet liquid passage 4411 and the refrigerant circulation pipeline 5, respectively. The refrigerant flowing out of the refrigeration unit 3 enters the inlet liquid passage 4411 through the inlet liquid pipe section 4421, and then flows to the refrigerant flow path 411 on the direct cooling plate 41.

[0073] The outlet liquid connector 443 can be connected to the side of the bottom plate 441 away from the direct cooling plate 41, and the outlet liquid connector 443 is provided with an outlet liquid pipe section 4431, and the outlet liquid pipe section 4431 is connected to the outlet liquid passage 4412 and the refrigerant circulation pipeline 5, respectively. The refrigerant flowing out of the refrigerant flow path 411 enters the refrigerant circulation pipeline 5 through the outlet liquid connector 443, and then enters the refrigeration unit 3 for heat exchange again, and reenters the new cycle. Through the connection of the bottom plate 441, the inlet liquid connector 442 and the outlet liquid connector 443, the refrigerant in the direct cooling plate 41 can enter the refrigeration unit 3 for heat exchange through the refrigerant circulation pipeline 5, and then enter the direct cooling plate 41 again, realizing the continuous heat exchange effect of the direct cooling plate 41 and the battery 2.

[0074] In some embodiments of the present application, the bottom plate 441 is arranged above the direct cooling plate 41, the liquid inlet pipe section 4421 is inserted into the liquid inlet channel 4411 from above, and the liquid outlet pipe section 4431 is inserted into the liquid outlet channel 4412 from above, so that the refrigerant circulation pipeline 5 is connected to the upper part of the liquid inlet pipe section 4421 and the liquid outlet pipe section 4431, respectively, leaving more space for the installation of the refrigerant circulation pipeline 5, facilitating the installation of the refrigerant circulation pipeline 5.

[0075] In some embodiments of the present application, the liquid inlet pipe section 4421 is arranged close to the limiting member 42. The liquid outlet pipe section 4431 is arranged close to the limiting member 42. That is, the liquid inlet pipe section 4421 is arranged inside the liquid inlet connector 442, and the liquid outlet pipe section 4431 is arranged inside the liquid outlet connector 443, so that the connectors can be arranged outside the liquid inlet connector 442 and the liquid outlet connector 443 to fix them to the direct cooling plate 41, avoiding the influence of the liquid inlet pipe section 4421 and the liquid outlet pipe section 4431, and facilitating the installation of the pressing plate structure 44. In some embodiments, the outer sides of the liquid inlet connector 442 and the liquid outlet connector 443 are respectively provided with first connecting holes that penetrate up and down, and the bottom plate 441 is provided with second connecting holes corresponding to the first connecting holes. The connectors can be screws. The screws are arranged in the first connecting holes and the second connecting holes to fix the liquid inlet connector 442 and the liquid outlet connector 443 to the bottom plate 441. The structure is simple, the connection is reliable, and the disassembly is convenient.

[0076] Figure 10 The structure of the bottom plate is shown in the second view of the present application.

[0077] As shown in Figure 4 and Figure 10 In some embodiments of the present application, the bottom plate 441 can be formed with a distribution flow channel 4413. The distribution flow channel 4413 is in communication with the liquid outlet channel 4412 and the refrigerant outlet 4112 of the refrigerant flow path 411. At least two groups of refrigerant flow paths 411 are formed on the direct cooling plate 41, and multiple groups of refrigerant flow paths 411 can be arranged side by side on the direct cooling plate 41. The refrigerant outlets 4112 of the multiple groups of refrigerant flow paths 411 can be in communication with the distribution flow channel 4413, respectively. That is, the refrigerant outlets 4112 of the multiple groups of refrigerant flow paths 411 can converge in the distribution flow channel 4413 and then enter the refrigerant circulation pipeline 5 from the liquid outlet channel 4412, reducing the arrangement of the liquid outlet connector 443 and simplifying the setting of the pipeline. In addition, the parallel arrangement of the multiple groups of refrigerant flow paths 411 can be realized, the distribution of the refrigerant flow path 411 is optimized, and the heat exchange effect of the direct cooling plate 41 is improved.

[0078] The refrigerant entering the liquid inlet connector 442 directly flows into the refrigerant inlet 4111 through the liquid inlet channel 4411, and then is distributed into different refrigerant flow paths 411.

[0079] Figure 11A structure diagram of the liquid inlet plug-in connector is provided.

[0080] As shown in Figure 7 , Figure 8 and Figure 11 , in some embodiments of the present application, the end of the liquid inlet pipe section 4421 connected with the liquid inlet channel 4411 is sleeved with at least two first sealing rings 444 distributed at intervals. The first sealing ring 444 is limited between the liquid inlet pipe section 4421 and the liquid inlet channel 4411. The two first sealing rings 444 arranged at intervals form a two-stage sealing structure between the liquid inlet plug-in connector 442 and the liquid inlet channel 4411, ensuring the sealing performance of the straight cooling plate assembly 4.

[0081] The end of the liquid outlet pipe section 4431 connected with the liquid outlet channel 4412 is sleeved with at least two second sealing rings 445 distributed at intervals. The second sealing ring 445 is limited between the liquid outlet pipe section 4431 and the liquid outlet channel 4412. The two second sealing rings 445 arranged at intervals form a two-stage sealing structure between the liquid outlet plug-in connector 443 and the liquid outlet channel 4431, ensuring the sealing performance of the straight cooling plate assembly 4.

[0082] In summary, the present application limits the battery installed on the straight cooling plate by setting a limiting piece on the straight cooling plate, realizes the quick positioning between the battery and the straight cooling plate, and sets a fixing piece connected with the straight cooling plate, fixes the battery to the straight cooling plate through the fixing piece, improves the connection stability between the battery and the straight cooling plate, prevents the battery from moving, and ensures the heat exchange effect.

[0083] In addition, by setting an insulating heat-conducting glue layer on the side of the straight cooling plate for installing the battery, the heat conduction effect between the battery and the straight cooling plate is improved. By adopting the two-stage sealing structure of the pressing plate assembly, the connection tightness between the refrigerant circulation pipeline and the refrigerant flow path on the straight cooling plate is improved.

[0084] It can be understood that, for those skilled in the art, equivalent replacements or changes can be made according to the technical solutions and application concepts of the present application, and these equivalent variants or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A battery energy storage device, characterized by, The application relates to a battery cooling device. The battery cooling device comprises: a shell, an inner part of the shell forms a containing space, the containing space can be used for placing a battery; a refrigerating unit arranged in the containing space, the refrigerating unit is used for adjusting the temperature of the battery; a direct cooling plate assembly arranged in the containing space, the direct cooling plate assembly and the refrigerating unit are connected through a refrigerant circulation pipeline to form a refrigerant circulation loop; the direct cooling plate assembly comprises: a direct cooling plate used for heat exchange with the battery; a plurality of limiting pieces arranged at least at opposite ends of the direct cooling plate, the limiting pieces are used for limiting the battery; 2. The battery energy storage device of claim 1, wherein, a fixing piece connected with the direct cooling plate, the fixing piece is used for fixing the battery on the direct cooling plate.

3. The battery energy storage device of claim 2, wherein, The opposite ends of the direct cooling plate are respectively provided with the limiting pieces, and the limiting pieces are located on a side of the direct cooling plate used for mounting the battery.

4. The battery energy storage device of any one of claims 1-3, wherein, The limiting pieces are arranged on the side of the direct cooling plate used for mounting the battery, and can abut against the end of the battery, the limiting pieces are provided with mounting holes, and the fixing piece is arranged in the mounting holes to fix the battery on the limiting pieces. The direct cooling plate is provided with a refrigerant flow path, the refrigerant flow path comprises a refrigerant inlet and a refrigerant outlet; 5. The battery energy storage device of claim 4, wherein, the direct cooling plate assembly further comprises a pressing plate structure connected with the direct cooling plate and located outside the limiting pieces, the pressing plate structure is communicated with the refrigerant inlet and the refrigerant outlet to connect the refrigerant flow path and the refrigerant circulation pipeline.

6. The battery energy storage device of claim 4, wherein, The refrigerant inlet and the refrigerant outlet are arranged in the middle of one end of the direct cooling plate. The pressing plate structure comprises: a bottom plate arranged on the direct cooling plate, the bottom plate is provided with an inlet liquid passage and an outlet liquid passage, the inlet liquid passage is communicated with the refrigerant inlet, and the outlet liquid passage is communicated with the refrigerant outlet; an inlet liquid plug connector connected with a side of the bottom plate away from the direct cooling plate, an inlet liquid pipe section is arranged on the inlet liquid plug connector, the inlet liquid pipe section is arranged close to the limiting piece, the inlet liquid pipe section is connected with the inlet liquid passage and the refrigerant circulation pipeline, and the inlet liquid pipe section is connected with the refrigerant circulation pipeline at an end of the inlet liquid plug connector away from the bottom plate; 7. The battery energy storage device of claim 6, wherein, an outlet liquid plug connector connected with a side of the bottom plate away from the direct cooling plate, an outlet liquid pipe section is arranged on the outlet liquid plug connector, the outlet liquid pipe section is arranged close to the limiting piece, the outlet liquid pipe section is connected with the outlet liquid passage and the refrigerant circulation pipeline, and the outlet liquid pipe section is connected with the refrigerant circulation pipeline at an end of the outlet liquid plug connector away from the bottom plate; the end of the inlet liquid pipe section connected with the inlet liquid passage is sleeved with at least two first sealing rings distributed at intervals, and the first sealing rings are located between the inlet liquid pipe section and the inlet liquid passage; 8. The battery energy storage device of claim 6, wherein, the end of the outlet liquid pipe section connected with the outlet liquid passage is sleeved with at least two second sealing rings distributed at intervals, and the second sealing rings are located between the outlet liquid pipe section and the outlet liquid passage. the bottom plate is provided with a liquid distribution flow channel communicated with the outlet liquid passage. At least two groups of the refrigerant flow paths are formed on the direct cooling plate, and the refrigerant outlets of the multiple groups of the refrigerant flow paths are respectively communicated with the distribution flow channels.

9. The battery energy storage device of claim 4, wherein, The direct cooling plate comprises a first sub-plate and a second sub-plate, the first sub-plate and the second sub-plate are arranged in a stack, the first sub-plate is configured as a flat plate, the refrigerant flow path is formed on the second sub-plate, and the refrigerant flow path is arranged in a convex manner towards the first sub-plate.

10. The battery energy storage device of claim 9, wherein, An insulating heat-conducting adhesive layer is arranged on the side of the first sub-plate away from the second sub-plate.

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