Battery cabinet

Abstract

The utility model relates to a battery cabinet. The battery cabinet comprises a cabinet body; the plurality of batteries are arranged in the cabinet body and distributed along the height direction of the cabinet body, and each battery is provided with a battery refrigerant inlet; the direct cooling unit is arranged in the cabinet body and is provided with a direct cooling unit refrigerant outlet; the input pipeline assembly comprises an input main pipeline and a plurality of input branch pipelines, the input main pipeline is communicated with the refrigerant outlet of the direct cooling unit and used for conveying a refrigerant from top to bottom in the height direction of the cabinet body, and all the input branch pipelines are arranged in the height direction of the cabinet body and correspond to the battery refrigerant inlets one to one; the input branch pipes are communicated between the input main pipe and the corresponding battery refrigerant inlets; wherein each input branch pipe is a pipeline with at least one bend, and in every two adjacent input branch pipes, the bend number of the input branch pipe located on the lower portion is smaller than that of the input branch pipe located on the upper portion. According to the battery cabinet, the structure can be simplified, and the refrigeration efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cabinet. BACKGROUND

[0002] With the rapid development of new energy industry, as an important part of the new energy industry, the safety problem of battery cabinet with large capacity gradually attracts attention.

[0003] In the process of charging and discharging of the battery cell module inside the battery cabinet, the battery cell module will generate heat. The most suitable temperature for the battery cell module to charge and discharge is in the range of 15℃ to 35℃. In order to ensure that the battery cell module can operate in the suitable temperature range, it is necessary to cool the battery cell module.

[0004] At present, the commonly used battery cell module cooling method is to arrange a liquid cooling plate at the bottom of the battery cell module. The liquid cooling medium with low temperature flows in the liquid cooling plate and cools the battery cell module. In this process, the liquid cooling medium with low temperature absorbs the heat of the battery cell module, and forms liquid cooling medium with high temperature. The liquid cooling medium with high temperature returns to the direct cooling unit and exchanges heat with the refrigerant circuit in the direct cooling unit to be cooled down again, and continues to circulate and cool the battery cell module in the subsequent process. This kind of refrigeration method has complex structure and low refrigeration efficiency. UTILITY MODEL CONTENT

[0005] Therefore, it is necessary to provide a battery cabinet which can simplify the structure and improve the refrigeration efficiency.

[0006] A battery cabinet, comprising:

[0007] a cabinet body;

[0008] a plurality of batteries arranged in the cabinet body and arranged along the height direction of the cabinet body, the batteries having battery refrigerant inlets;

[0009] a direct cooling unit arranged in the cabinet body and having a direct cooling unit refrigerant outlet;

[0010] an input pipeline assembly comprising an input main pipeline and a plurality of input branch pipelines, the input main pipeline being in communication with the direct cooling unit refrigerant outlet and being used to transport refrigerant from top to bottom along the height direction of the cabinet body, all the input branch pipelines being arranged along the height direction of the cabinet body and corresponding to the battery refrigerant inlets one by one, the input branch pipelines being in communication between the input main pipeline and the corresponding battery refrigerant inlets;

[0011] The input branch pipe is a pipe with at least one bend, and in any two adjacent input branch pipes, the lower input branch pipe has fewer bends than the upper input branch pipe.

[0012] In some embodiments, in each pair of adjacent input branch pipes, the length of the lower input branch pipe is less than the length of the upper input branch pipe, and / or, the diameter of the lower input branch pipe is greater than the diameter of the upper input branch pipe.

[0013] In some embodiments, the battery has a battery refrigerant outlet, and the direct-cooling unit has a direct-cooling unit refrigerant inlet;

[0014] The battery cabinet also includes an output pipe assembly, which includes an output main pipe and multiple output branch pipes. The output main pipe is connected to the refrigerant inlet of the direct cooling unit. All the output branch pipes are arranged along the height of the cabinet and correspond one-to-one with the battery refrigerant outlet. The output branch pipes are connected between the output main pipe and the corresponding battery refrigerant outlet.

[0015] In some embodiments, the diameter of the output main pipe is larger than the diameter of the input main pipe, and / or the diameter of the output branch pipe is larger than the diameter of the input branch pipe.

[0016] In some embodiments, the diameters of the output main pipe and the input main pipe are D1 and D2, respectively; or, the diameters of the output branch pipe and the input branch pipe are D1 and D2, respectively, where 12mm≤D1≤20mm and 4mm≤D2≤10mm.

[0017] In some embodiments, at least one of the input main pipe, the input branch pipe, the output main pipe, and the output branch pipe is a metal pipe.

[0018] In some embodiments, the battery includes an inlet pipe and an inlet connector. The inlet pipe is disposed at the refrigerant inlet of the battery, and the inlet connector is installed on the inlet pipe. The input pipe assembly further includes multiple input connectors, each corresponding to one of the input branch pipes. Each input connector is disposed on a corresponding input branch pipe and communicates with and is fixedly connected to the corresponding inlet connector. The battery cabinet further includes an input sealing gasket, each corresponding to one of the inlet connectors and the input connectors. The input sealing gasket is tightly sealed between the corresponding inlet connector and the input connector.

[0019] And / or, the battery includes a liquid outlet pipe and a liquid outlet connector, the liquid outlet pipe being disposed at the refrigerant outlet of the battery, and the liquid outlet connector being installed on the liquid outlet pipe; the output pipe assembly further includes multiple output connectors, all of which correspond one-to-one with all of the output branch pipes, the output connectors being disposed on the corresponding output branch pipes and communicating and being fixedly connected with the corresponding liquid outlet connectors, and the battery cabinet further includes an output sealing gasket, the output sealing gaskets corresponding one-to-one with the liquid outlet connectors and the output connectors, and the output sealing gaskets being tightly fitted between the corresponding liquid outlet connectors and the output connectors.

[0020] In some embodiments, the main input pipe includes multiple main input sections, all of which are arranged along the height of the battery cabinet. The input pipe assembly includes multiple shunt three-way valves, and the input branch pipe and two main input sections adjacent to the input branch pipe are connected through the shunt three-way valves.

[0021] And / or, the main output pipe includes multiple main output sections, all of which are arranged along the height of the battery cabinet. The output pipe assembly includes multiple three-way valves, and the branch output pipe and two main output sections adjacent to the branch output pipe are connected through the three-way valves.

[0022] In some embodiments, the direct cooling unit is located beside the battery.

[0023] In some embodiments, the battery cabinet further includes a control system electrically connected to each of the batteries and used to control the charging or discharging of each of the batteries.

[0024] Compared with the prior art, this application has the following beneficial effects:

[0025] The aforementioned battery cabinet directly utilizes refrigerant to cool the batteries. Under the same cooling effect, the refrigerant achieves higher cooling efficiency. Furthermore, this design reduces the need for a liquid cooling medium circulation loop, requiring only one refrigerant circulation loop. Therefore, fewer components are needed, resulting in a simpler battery cabinet structure. Further, by designing the lower input branch pipe to have fewer bends than the upper one, although the refrigerant's flow resistance gradually increases in the main input pipe as it flows downwards, the flow resistance gradually decreases in the lower input branch pipes. This flow resistance neutralization ensures that the flow resistance from the main input pipe to each input branch pipe is essentially the same, resulting in a consistent refrigerant flow rate into each battery. Consequently, the cooling effect of each battery is essentially consistent, exhibiting good temperature uniformity, high cooling efficiency, and excellent cooling performance. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the battery cabinet in one embodiment of this application;

[0027] Figure 2 for Figure 1 An enlarged schematic diagram of a portion of structure A in the battery cabinet shown;

[0028] Figure 3 for Figure 1 An enlarged schematic diagram of a portion of structure B in the battery cabinet shown;

[0029] Figure 4 for Figure 1 An enlarged schematic diagram of a portion of structure C in the battery cabinet shown;

[0030] Figure 5 for Figure 1 The diagram shows the structure of the input branch pipe in the battery cabinet.

[0031] Icon labels:

[0032] 100. Battery cabinet;

[0033] 10. Cabinet; 20. Battery; 30. Direct cooling unit; 40. Input piping assembly; 50. Output piping assembly; 60. Control system;

[0034] 21. Direct cooling plate; 22. Liquid inlet pipe; 23. Liquid inlet connector; 24. Liquid outlet pipe; 25. Liquid outlet connector;

[0035] 41. Input main pipe; 42. Input branch pipe; 421. Bend; 43. Input connector;

[0036] 51. Main output pipe; 511. Main output section; 52. Branch output pipe; 53. Output connector; 54. Combination three-way valve. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0038] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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 application.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0043] With the rapid development of the new energy industry, the safety of large-capacity battery cabinets, as an important part of the new energy industry, has gradually received attention.

[0044] During the charging and discharging process of the battery cells inside the battery cabinet, the cells generate heat. The optimal temperature range for charging and discharging the cells is between 15℃ and 35℃. To ensure that the cells can operate within this suitable temperature range, cooling is necessary.

[0045] Currently, the common cooling method for battery cell modules involves placing a liquid cooling plate at the bottom of the module. A low-temperature liquid cooling medium flows within the plate, cooling the module. During this process, the lower-temperature liquid cooling medium absorbs heat from the module, forming a higher-temperature liquid cooling medium. This higher-temperature medium flows back to the direct-cooling unit, where it exchanges heat with the refrigerant circuit and is cooled again, continuing the cycle to cool the battery cell module. This cooling method is structurally complex and has low cooling efficiency.

[0046] Please see Figures 1 to 5To alleviate the aforementioned problems, the applicant of this application, after in-depth research, designed a new battery cabinet 100. The battery cabinet 100 includes a cabinet body 10, multiple batteries 20, a direct-cooling unit 30, an input pipe assembly 40, and an output pipe assembly 50. All batteries 20 and the direct-cooling unit 30 are housed within the cabinet body 10, with all batteries 20 arranged along the height of the cabinet body 10. Each battery 20 has a refrigerant inlet and a refrigerant outlet, and each direct-cooling unit 30 has a refrigerant inlet and a refrigerant outlet. The input pipe assembly 40 includes a main input pipe 41 and multiple branch input pipes 42. The main input pipe 41 connects to the refrigerant outlet of the direct-cooling unit and is used to transport refrigerant from top to bottom along the height of the cabinet body 10. All branch input pipes 42 are arranged along the height of the cabinet body 10 and correspond one-to-one with the battery refrigerant inlets. Each branch input pipe 42 connects to the main input pipe 41 and its corresponding battery refrigerant inlet. The input branch pipe 42 is a pipe with at least one bend 421. In every two adjacent input branch pipes 42, the lower input branch pipe 42 has fewer bends than the upper input branch pipe 42. The output pipe assembly 50 is connected to the refrigerant inlet of the direct-cooling unit and all the refrigerant outlets of the batteries, and the output pipe assembly 50, together with the input pipe assembly 40, the direct-cooling unit 30 and all the batteries 20, forms a refrigerant circulation loop.

[0047] Specifically, the cabinet 10 mainly serves as an installation and support unit. The cabinet 10 has an installation space inside, where the battery 20, the direct cooling unit 30, the input pipe assembly 40, and the output pipe assembly 50 are all installed.

[0048] The battery 20 includes a cell module and a direct cooling plate 21. The cell module is used to store and release electrical energy. The direct cooling plate 21 is in contact with the cell module, and the inside of the direct cooling plate 21 is provided with a flow channel for the refrigerant to flow. The battery refrigerant inlet and battery refrigerant outlet are located on the direct cooling plate 21 and are connected to the battery refrigerant inlet and battery refrigerant outlet.

[0049] As an example, the direct cooling plate 21 can be located at the bottom, top, side, etc. of the cell module. Preferably, the direct cooling plate 21 is located at the bottom of the cell module, so that the direct cooling plate 21 can also support the cell module. For ease of explanation, the following embodiments will be described with the direct cooling plate 21 located at the bottom of the cell module as an example.

[0050] The direct cooling unit 30 can be installed along the height of the cabinet 10 on the top or bottom side of the battery 20, or it can be installed along the length of the cabinet 10 on the side of the battery 20. As an example, the direct cooling unit 30 is installed on the side of the battery 20, which helps to reduce the height of the battery cabinet 100.

[0051] The direct-cooling unit 30 includes a compressor, a condenser, and a throttling valve. The compressor compresses the refrigerant to form a high-temperature, high-pressure gaseous refrigerant, which is then delivered to the condenser. The high-temperature, high-pressure gaseous refrigerant releases heat at the condenser and condenses to form a normal-temperature, high-pressure liquid refrigerant. Then, the liquid refrigerant is depressurized and throttled by the throttling valve to become a low-temperature, low-pressure liquid refrigerant, which is then output from the refrigerant outlet of the direct-cooling unit.

[0052] The main input pipe 41 is connected to the refrigerant outlet of the direct-cooling unit, and the branch input pipe 42 corresponds one-to-one with the refrigerant inlet of the battery. The branch input pipe 42 is connected between the main input pipe 41 and the corresponding refrigerant inlet of the battery.

[0053] Low-temperature, low-pressure liquid refrigerant is output from the refrigerant outlet of the direct-cooling unit and enters the main input pipe 41 for branching. Then, it flows through the input branch pipe 42 and the battery refrigerant inlet into the direct-cooling plate 21, where it absorbs heat from the battery module to form a gas-liquid two-phase refrigerant. It is then output from the battery refrigerant outlet and finally flows back into the direct-cooling unit 30 through the output pipe assembly 50 for recirculation.

[0054] Understandably, in existing technologies, cooling using liquid cooling media is considered indirect cooling. Specifically, the refrigerant cools the liquid cooling media, and the liquid cooling media cools the battery cell module; that is, the refrigerant indirectly cools the battery cell module through the liquid cooling media. Therefore, under the same cooling effect, the cooling efficiency of the liquid cooling media is lower than that of the refrigerant. Furthermore, indirect cooling requires two separate circulation loops for the liquid cooling media and the refrigerant, thus requiring more components and consequently, making the structure of the battery cabinet 100 for indirect cooling more complex.

[0055] In this application, a refrigerant circulation loop is formed by designing a direct cooling unit 30, a battery 20, an input pipe assembly 40, and an output pipe assembly 50, allowing the refrigerant to directly cool the battery 20. Under the same cooling effect, the refrigerant achieves higher cooling efficiency. Furthermore, this design reduces the need for a liquid cooling medium circulation loop, requiring only one refrigerant circulation loop. Therefore, fewer components are needed, and correspondingly, the structure of the battery cabinet 100 is simpler.

[0056] Furthermore, the main inlet pipe 41 transports refrigerant from top to bottom along the height of the cabinet 10. The longer the path of the refrigerant within the main inlet pipe 41, the greater the flow resistance. Conversely, the fewer bends in the inlet branch pipe 42, the smaller the flow resistance of the refrigerant flowing through it. By designing the lower input branch pipe 42 to have fewer bends than the upper input branch pipe 42, although the flow resistance of the refrigerant gradually increases in the main input pipe 41 as the refrigerant flows downwards, the flow resistance gradually decreases in the lower input branch pipes 42. This neutralization of flow resistance ensures that the flow resistance of the refrigerant from the main input pipe 41 to each input branch pipe 42 is basically the same. Consequently, the flow rate of refrigerant entering each battery 20 is also basically the same. Therefore, the cooling effect of each battery 20 is basically the same, and each battery 20 has good temperature consistency, high cooling efficiency, and good cooling effect.

[0057] Furthermore, liquid cooling media are typically a mixture of ethylene glycol and aqueous solution. This mixture is conductive, so in the event of a liquid cooling media leak, the battery cabinet 100 is prone to insulation failure, short circuits, and other safety issues. Commonly used refrigerants (such as R410A and R32; R410A is a chlorine-free fluoroalkane non-azeotropic refrigerant, and R32 is a chlorine-free fluoroalkane refrigerant) are generally gases at room temperature and pressure and have good electrical insulation properties, therefore they are non-conductive and safer to use.

[0058] In some embodiments, in each pair of adjacent input branch pipes 42, the length of the lower input branch pipe 42 is less than the length of the upper input branch pipe 42, and / or, the diameter of the lower input branch pipe 42 is greater than the diameter of the upper input branch pipe 42.

[0059] The shorter the length of the input branch pipe 42 and the larger its diameter, the lower the flow resistance of the refrigerant flowing through it. By designing that the length of the lower input branch pipe 42 is shorter than that of the upper input branch pipe 42, and / or that the diameter of the lower input branch pipe 42 is larger than that of the upper input branch pipe 42, the length of the input branch pipe 42 gradually decreases and / or the diameter gradually increases from top to bottom. Therefore, although the flow resistance of the refrigerant gradually increases in the main input pipe 41 as the refrigerant flows downwards, the flow resistance gradually decreases in the lower input branch pipes 42. This neutralization of flow resistance ensures that the flow resistance of the refrigerant from the main input pipe 41 to each input branch pipe 42 is essentially the same, resulting in a consistent cooling effect for each battery 20. This leads to good temperature uniformity, high cooling efficiency, and excellent cooling performance in each battery 20.

[0060] In some embodiments, the battery cabinet 100 further includes an output pipe assembly 50, which includes an output main pipe 51 and a plurality of output branch pipes 52. The output main pipe 51 is connected to the refrigerant inlet of the direct cooling unit. All output branch pipes 52 are arranged along the height direction of the cabinet 10 and correspond one-to-one with the battery refrigerant outlet. The output branch pipes 52 are connected between the output main pipe 51 and the corresponding battery refrigerant outlet.

[0061] In actual operation, the low-temperature, low-pressure liquid refrigerant is output from the refrigerant outlet of the direct-cooling unit and distributed to the input branch pipes 42 through the main output pipes 51. It then enters the direct-cooling plates 21 of each battery 20, absorbing heat from the cell modules and gradually undergoing a phase change, with some of the liquid refrigerant transforming into a gaseous refrigerant. Afterward, the two-phase refrigerant is output from the refrigerant outlet of each battery and converges back to the main output pipes 51 through the output branch pipes 52, finally returning to the direct-cooling unit 30 through the refrigerant inlet for recirculation.

[0062] It can be seen that the design of the main output pipe 51 and the branch output pipe 52 in the output pipe assembly 50 can circulate the refrigerant to facilitate the cyclic cooling of the battery 20.

[0063] Please see Figure 2 and Figure 3 In some embodiments, the diameter of the output main pipe 51 is larger than the diameter of the input main pipe 41, and / or, the diameter of the output branch pipe 52 is larger than the diameter of the input branch pipe 42. For example, the diameter of the output main pipe 51 is larger than the diameter of the input main pipe 41, and the diameter of the output branch pipe 52 is larger than the diameter of the input branch pipe 42.

[0064] Preferably, the diameters of the output main pipe 51 and the input main pipe 41 are D1 and D2, respectively; or, the diameters of the output branch pipe 52 and the input branch pipe 42 are D1 and D2, respectively, where 12mm≤D1≤20mm and 4mm≤D2≤10mm.

[0065] It is understandable that the refrigerant output from the refrigerant outlet of the direct-cooling unit is a liquid refrigerant with a small volume. However, after the liquid refrigerant cools the battery module, some of the refrigerant changes from liquid to gas, resulting in a larger volume. Therefore, considering the volume of the refrigerant, it is advisable to design the diameter of the output main pipe 51 to be larger than that of the input main pipe 41, and / or the diameter of the output branch pipe 52 to be larger than that of the input branch pipe 42. This reduces the pressure exerted by the refrigerant on the input main pipe 41, input branch pipe 42, output main pipe 51, and output branch pipe 52 during the refrigerant circulation process, thereby reducing the risk of rupture in these pipes and ensuring the reliability of the refrigerant circulation.

[0066] In some embodiments, at least one of the input main pipe 41, input branch pipe 42, output main pipe 51, and output branch pipe 52 is a metal pipe. For example, the input main pipe 41, input branch pipe 42, output main pipe 51, and output branch pipe 52 are all metal pipes, such as copper pipes.

[0067] In the traditional battery cabinet 100, the input main pipe 41, input branch pipe 42, output main pipe 51 and output branch pipe 52 are all made of nylon or rubber. Nylon or rubber has insufficient density and the molecular structure of the refrigerant is small. Moreover, nylon and rubber are easily deformed by high temperature environment. All these factors lead to refrigerant leakage in nylon or rubber, reducing the reliability of refrigerant circulation.

[0068] In this application, at least one of the input main pipe 41, input branch pipe 42, output main pipe 51 and output branch pipe 52 is designed to be a metal pipe. The molecules in the metal pipe are extremely dense and are not easily deformed by the high temperature environment. Therefore, the refrigerant is less likely to leak during the flow of the refrigerant in the metal pipe, and the reliability of the refrigerant cycle is improved.

[0069] Please see Figure 1 and Figure 4In some embodiments, the battery 20 includes an inlet pipe 22 and an inlet connector 23. The inlet pipe 22 is disposed at the battery refrigerant inlet, and the inlet connector 23 is installed on the inlet pipe 22. The input pipe assembly 40 also includes a plurality of input connectors 43. All input connectors 43 correspond one-to-one with all input branch pipes 42. The input connectors 43 are disposed on the corresponding input branch pipes 42 and are connected and fixedly connected to the corresponding inlet connectors 23. The battery cabinet 100 also includes an input sealing gasket. The input sealing gasket corresponds one-to-one with the inlet connectors 23 and 43. The input sealing gasket is tightly sealed between the corresponding inlet connectors 23 and 43. And / or, the battery 20 includes an outlet pipe 24 and an outlet connector 25. The outlet pipe 24 is located at the battery refrigerant outlet, and the outlet connector 25 is installed on the outlet pipe 24. The output pipe assembly 50 also includes multiple output connectors 53. All output connectors 53 correspond one-to-one with all output branch pipes 52. The output connectors 53 are located on the corresponding output branch pipes 52 and are connected and fixedly connected to the corresponding outlet connectors 25. The battery cabinet 100 also includes an output sealing gasket. The output sealing gasket corresponds one-to-one with the outlet connectors 25 and the output connectors 53. The output sealing gasket is tightly sealed between the corresponding outlet connectors 25 and the output connectors 53.

[0070] As an example, the corresponding input connector 43 and liquid inlet connector 23, as well as the corresponding output connector 53 and liquid outlet connector 25, are all fixedly connected by screws.

[0071] The inclusion of the inlet pipe 22, inlet connector 23, and input connector 43 facilitates the connection between the input pipeline assembly 40 and the refrigerant inlet of each battery 20, ensuring that refrigerant can be input into the direct cooling plate 21 of each battery 20 and cool the cell modules within each battery 20. The inclusion of the input sealing gasket improves the sealing performance between the corresponding inlet connector 23 and input connector 43, reducing the risk of refrigerant leakage during the input process into the battery 20.

[0072] The placement of the liquid outlet pipe 24, liquid outlet connector 25, and output connector 53 facilitates the connection between the output pipe assembly 50 and the refrigerant outlet of each battery 20, thereby ensuring that the refrigerant after cooling the cell module can be output to each battery 20 and ultimately circulated back to the direct cooling unit 30. The placement of the output sealing gasket improves the sealing performance between the corresponding liquid outlet connector 25 and output connector 53, reducing the risk of refrigerant leakage during the output process to the batteries 20.

[0073] Please see Figures 1 to 3In some embodiments, the input main pipe 41 includes multiple input main sections, all of which are arranged along the height of the battery cabinet 100. The input pipe assembly 40 includes multiple diverter three-way valves, and the input branch pipe 42 and two adjacent input main sections are connected through the diverter three-way valves. And / or, the output main pipe 51 includes multiple output main sections 511, all of which are arranged along the height of the battery cabinet 100. The output pipe assembly 50 includes multiple manifold three-way valves 54, and the output branch pipe 52 and two adjacent output main sections 511 are connected through the manifold three-way valves 54.

[0074] By setting multiple diversion three-way valves in the input pipeline assembly 40, it is convenient to connect each input branch pipe 42 with the input main pipe 41. By setting multiple manifold three-way valves 54 in the output pipeline assembly 50, it is convenient to connect each output branch pipe 52 with the output main pipe 51.

[0075] In some embodiments, the battery cabinet 100 further includes a control system 60, which is electrically connected to each battery 20 and is used to control the charging or discharging of each battery 20.

[0076] The aforementioned battery cabinet 100 directly utilizes refrigerant to cool the battery 20. Under the same cooling effect, the refrigerant has a higher cooling efficiency. Furthermore, this design reduces the need for a liquid cooling medium circulation loop, requiring only one refrigerant circulation loop. Therefore, fewer components are needed, and correspondingly, the structure of the battery cabinet 100 is simpler. Furthermore, by designing that the number of bends in the lower input branch pipe 42 is less than that in the upper input branch pipe 42, although the flow resistance of the refrigerant in the main input pipe 41 gradually increases as the refrigerant flows downward, the flow resistance of the refrigerant in the lower input branch pipes 42 gradually decreases. This neutralization of flow resistance makes the flow resistance of the refrigerant from the main input pipe 41 to each input branch pipe 42 basically the same, and thus the flow rate of the refrigerant entering each battery 20 is also basically the same. Therefore, the cooling effect of each battery 20 is basically the same, each battery 20 has good temperature consistency, high cooling efficiency and good cooling effect.

[0077] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cabinet, characterized in that, The battery cabinet includes: Cabinet (10); Multiple batteries (20) are disposed inside the cabinet (10) and arranged along the height direction of the cabinet (10). Each battery (20) has a battery refrigerant inlet. A direct cooling unit (30) is installed inside the cabinet (10) and has a direct cooling unit refrigerant outlet; The input pipeline assembly (40) includes an input main pipe (41) and multiple input branch pipes (42). The input main pipe (41) is connected to the refrigerant outlet of the direct cooling unit and is used to transport refrigerant from top to bottom along the height direction of the cabinet (10). All the input branch pipes (42) are arranged along the height direction of the cabinet (10) and correspond one-to-one with the battery refrigerant inlet. The input branch pipes (42) are connected between the input main pipe (41) and the corresponding battery refrigerant inlet. The input branch pipe (42) is a pipe with at least one bend (421), and in each pair of adjacent input branch pipes (42), the number of bends in the lower input branch pipe (42) is less than the number of bends in the upper input branch pipe (42).

2. The battery cabinet according to claim 1, characterized in that, In each pair of adjacent input branch pipes (42), the length of the lower input branch pipe (42) is less than the length of the upper input branch pipe (42), and / or, the diameter of the lower input branch pipe (42) is greater than the diameter of the upper input branch pipe (42).

3. The battery cabinet according to claim 1, characterized in that, The battery (20) has a battery refrigerant outlet, and the direct cooling unit (30) has a direct cooling unit refrigerant inlet; The battery cabinet also includes an output pipe assembly (50), which includes an output main pipe (51) and multiple output branch pipes (52). The output main pipe (51) is connected to the refrigerant inlet of the direct cooling unit. All the output branch pipes (52) are arranged along the height direction of the cabinet (10) and correspond one-to-one with the battery refrigerant outlet. The output branch pipes (52) are connected between the output main pipe (51) and the corresponding battery refrigerant outlet.

4. The battery cabinet according to claim 3, characterized in that, The diameter of the output main pipe (51) is greater than the diameter of the input main pipe (41), and / or the diameter of the output branch pipe (52) is greater than the diameter of the input branch pipe (42).

5. The battery cabinet according to claim 4, characterized in that, The diameters of the main output pipe (51) and the main input pipe (41) are D1 and D2 respectively, or the diameters of the branch output pipe (52) and the branch input pipe (42) are D1 and D2 respectively, 12mm≤D1≤20mm, 4mm≤D2≤10mm.

6. The battery cabinet according to claim 3, characterized in that, At least one of the input main pipe (41), the input branch pipe (42), the output main pipe (51), and the output branch pipe (52) is a metal pipe.

7. The battery cabinet according to claim 3, characterized in that, The battery (20) includes an inlet pipe (22) and an inlet connector (23). The inlet pipe (22) is located at the refrigerant inlet of the battery, and the inlet connector (23) is installed on the inlet pipe (22). The input pipe assembly (40) also includes multiple input connectors (43). All input connectors (43) correspond one-to-one with all input branch pipes (42). The input connectors (43) are located on the corresponding input branch pipes (42) and are connected and fixedly connected to the corresponding inlet connectors (23). The battery cabinet also includes an input sealing gasket. The input sealing gasket corresponds one-to-one with the inlet connectors (23) and the input connectors (43). The input sealing gasket is tightly sealed between the corresponding inlet connectors (23) and the input connectors (43). And / or, the battery (20) includes an outlet pipe (24) and an outlet connector (25), the outlet pipe (24) is disposed at the refrigerant outlet of the battery, and the outlet connector (25) is installed on the outlet pipe (24); the output pipe assembly (50) also includes a plurality of output connectors (53), all of the output connectors (53) correspond one-to-one with all of the output branch pipes (52), the output connectors (53) are disposed on the corresponding output branch pipes (52) and communicate with and are fixedly connected to the corresponding outlet connectors (25), the battery cabinet also includes an output sealing gasket, the output sealing gasket corresponds one-to-one with the outlet connectors (25) and the output connectors (53), and the output sealing gasket is tightly sealed between the corresponding outlet connectors (25) and the output connectors (53).

8. The battery cabinet according to claim 3, characterized in that, The main input pipe (41) includes multiple main input sections. All the main input sections of the main input pipe (41) are arranged along the height direction of the battery cabinet. The input pipe assembly (40) includes multiple diversion three-way valves. The input branch pipe (42) and the two main input sections adjacent to the input branch pipe (42) are connected through the diversion three-way valves. And / or, the main output pipe (51) includes multiple main output sections (511), all of the main output sections (511) of the main output pipe (51) are arranged along the height direction of the battery cabinet, the output pipe assembly (50) includes multiple three-way valves (54), the output branch pipe (52) and the two main output sections (511) adjacent to the output branch pipe (52) are connected through the three-way valves (54).

9. The battery cabinet according to claim 1, characterized in that, The direct cooling unit (30) is located next to the battery (20).

10. The battery cabinet according to claim 1, characterized in that, The battery cabinet also includes a control system (60), which is electrically connected to each of the batteries (20) and is used to control the charging or discharging of each of the batteries (20).

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