Liquid cooling energy storage battery system

Abstract

The utility model relates to the technical field of batteries, and discloses a liquid cooling energy storage battery system, which comprises an energy storage rack, a battery module, a liquid storage box body, a heat exchange chamber and a power pump, the battery module comprises a drawer box and a plurality of battery pack components, a cooling medium liquid circulation loop is formed between the drawer box and the liquid storage box body, and the power pump is connected with the drawer box. The battery pack assembly is internally provided with a phase-change material accommodating cavity, and is filled with a phase-change material to realize 10-40 DEG C solid-liquid phase change so as to control the temperature of the working environment in the battery pack assembly. According to the liquid cooling energy storage battery system disclosed by the utility model, through combined use of liquid cooling circulation and the phase change material, the system can efficiently take away and dissipate heat generated by the battery, so that the battery is ensured to operate in a proper temperature range, the aging of the battery is delayed, the service life of the battery is prolonged, and the risk of overheating of the battery is reduced; and the safety of the whole energy storage system is improved.

Description

Technical Field

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

[0002] With the increasing global demand for clean energy, lithium-ion batteries, as the core technology of electrochemical energy storage, are becoming increasingly important in the energy storage market. However, while pursuing high energy density, lithium-ion batteries also face multiple challenges such as cycle performance, thermal runaway risk, and cost control. Especially in large-scale energy storage applications, how to ensure the efficient heat dissipation of the battery system and maintain a reasonable working temperature range has become a key factor restricting its further development.

[0003] An immersion energy storage battery box and its battery cabinet disclosed in the patent No. CN115347274B are provided with a coolant flow channel in the battery box, and an immersion cooling method is adopted to directly contact the coolant with the battery cells. Moreover, the internal circulation and external circulation are combined to greatly improve the heat dissipation efficiency. However, there is still room for improvement in controlling the temperature fluctuation of the complex system, improving the energy utilization efficiency, and reducing the cost. Utility Model Content

[0004] In view of this, the utility model aims to propose a liquid-cooled energy storage battery system, which realizes the efficient heat dissipation and temperature control of the energy storage battery components by skillfully combining the liquid-cooling cycle and the phase change material technology.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A liquid-cooled energy storage battery system includes:

[0007] An energy storage rack for placing battery modules, where the battery modules include drawer boxes and a plurality of battery pack components, and the plurality of battery pack components are placed inside the drawer boxes;

[0008] A liquid storage box body for providing a cooling medium to the inside of the drawer box;

[0009] A heat exchange chamber with a heat exchanger coil disposed therein, and the opposite ends of the heat exchanger coil are respectively communicated with the drawer box and the liquid storage box body to form a loop;

[0010] A power pump disposed between the liquid storage box body and the inlet pipe of the heat exchanger coil for providing power for the flow of the cooling medium between the liquid storage box body and the drawer box;

[0011] The battery pack component includes an energy storage battery component and a battery pack housing, a phase change material accommodation cavity is provided inside the battery pack housing, and a phase change material is filled in the phase change material accommodation cavity, and the phase change material undergoes solid-liquid phase change between 10°C and 40°C.

[0012] Further, the drawer box is connected or separated from the heat exchange chamber by a quick-connect plug, and the drawer box can slide or be fixed relative to the energy storage rack.

[0013] Further, a first rear plate is provided at the rear end of the drawer box. Correspondingly, a first front plate is provided at the front end of the heat exchange chamber. A quick-connect female head is provided on the first front plate, and a quick-connect male head is provided on the first rear plate. When the drawer box slides in place from the front end to the rear end of the energy storage rack, the quick-connect male head is flexibly inserted into the quick-connect female head for sealed communication.

[0014] Further, two upper and lower rows of the quick-connect female heads are provided on the first front plate. Correspondingly, two upper and lower rows of the quick-connect male heads are provided on the first rear plate.

[0015] Further, the battery pack housing includes a first inner side plate, a first outer side plate, a first inner bottom plate, and a first outer bottom plate. The first inner bottom plate is provided at the lower end of the first inner side plate, and the first outer bottom plate is provided at the lower end of the first outer side plate. The first inner side plate, the first outer bottom plate, the first inner side plate, and the first inner bottom plate enclose a phase change material accommodation cavity with an open upper end.

[0016] Further, a sealing plug is provided at the upper end of the phase change material accommodation cavity. The sealing plug includes a sealing plug-in plate and a sealing baffle. The sealing plug-in plate is hermetically inserted into the phase change material accommodation cavity, and the sealing baffle is limited and fixed at the upper end of the battery pack housing.

[0017] Further, a support assembly is provided between the first inner bottom plate and the first outer bottom plate.

[0018] Further, the support assembly includes a transverse grid and a longitudinal grid. The transverse grid and the longitudinal grid are arranged vertically. A plurality of first communication holes are provided on the transverse grid, and a plurality of first communication grooves are provided on the longitudinal grid.

[0019] Further, the first communication holes are provided at a position close to the middle on the transverse grid, and the first communication grooves are provided at the ends of the longitudinal grid close to the first inner bottom plate and / or the first outer bottom plate. The first communication grooves are semicircularly arranged.

[0020] Further, a support seat is provided at the bottom of the battery pack housing. The support seat includes a first connecting portion and a first supporting portion. The first connecting portion passes through the first outer bottom plate and is threadedly connected to the first inner bottom plate. A sealing layer is sleeved outside the first supporting portion for sealing connection between the first supporting portion and the first outer bottom plate.

[0021] Compared with the prior art, the liquid-cooled energy storage battery system of the present utility model has the following advantages:

[0022] (1) In the liquid-cooled energy storage battery system of the present utility model, through the combined use of liquid-cooling circulation and phase change materials, the system can efficiently take away and dissipate the heat generated by the battery, ensure that the battery operates within an appropriate temperature range, delay battery aging, extend the service life of the battery, reduce the risk of battery overheating, and improve the safety of the entire energy storage system.

[0023] (2) In the liquid-cooled energy storage battery system of the present utility model, through an innovative structural design, significant heat dissipation effects and effective regulation of battery temperature are achieved, significantly improving the service life and performance of the battery. The quick-connect plug design is ingeniously adopted to achieve convenient connection and rapid separation between the drawer box and the heat exchange chamber, greatly simplifying the replacement and maintenance processes of the battery pack components, and improving the maintainability and operation convenience of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0025] Figure 1 is a schematic structural diagram of the liquid-cooled energy storage battery system according to an embodiment of the present utility model;

[0026] Figure 2 is a top-view structural diagram of the battery pack assembly placed and assembled in the drawer box according to an embodiment of the present utility model;

[0027] Figure 3 is an exploded structural diagram of the quick-connect plug assembly according to an embodiment of the present utility model;

[0028] Figure 4 is a schematic structural diagram of the battery pack assembly according to an embodiment of the present utility model;

[0029] Figure 5 is an exploded structural diagram of the battery pack assembly according to an embodiment of the present utility model;

[0030] Figure 6 is an exploded structural diagram of the battery pack assembly from a second perspective according to an embodiment of the present utility model;

[0031] Figure 7 is a front-view structural diagram of the battery pack housing, sealing plug, and support seat assembly according to an embodiment of the present utility model;

[0032] Figure 8 is Figure 7 the sectional structural diagram of D-D in

[0033] Figure 9 is Figure 8 The partial enlarged structural schematic diagram of part A in it;

[0034] Figure 10 The sectional structural schematic diagram of the battery pack housing in the embodiment of the present utility model after removing the first outer bottom plate;

[0035] Explanation of reference numerals:

[0036] 1 - Energy storage rack; 2 - Battery module; 3 - Heat exchange chamber; 31 - First front plate; 4 - Heat exchanger coil; 5 - Power pump; 6 - Liquid storage box body; 7 - Quick connector; 71 - Quick female head; 72 - Quick male head; 8 - Drawer box; 81 - First rear plate; 9 - Battery pack assembly; 91 - Energy storage battery assembly; 9101 - Battery cell; 9102 - First end plate; 9103 - Second end plate; 9104 - Tie strap; 92 - Battery pack housing; 9201 - First inner side plate; 9202 - First outer side plate; 9203 - Phase change material accommodation cavity; 9204 - First inner bottom plate; 9205 - First outer bottom plate; 9206 - Support assembly; 9207 - Transverse grid; 9208 - First communication hole; 9209 - Longitudinal grid; 9210 - First communication groove; 93 - Sealing plug; 9301 - Sealing plugging plate; 9302 - Sealing baffle; 94 - Support seat; 9401 - First connection part; 9402 - First support part; 9403 - Sealing layer. Detailed implementation manners

[0037] In order to make the technical means, achieved purpose and efficacy of the present utility model easy to understand, the embodiments of the present utility model will be described in detail below with reference to specific drawings.

[0038] It should be noted that all the terms for indicating directions and positions in the present utility model, such as: "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "top", "bottom", "transverse", "longitudinal", "center", etc., are only used to explain the relative position relationship and connection situation between components in a certain specific state (as shown in the drawings), and are only for the convenience of describing the present utility model, rather than requiring the present utility model to be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features.

[0039] In the description of the present utility model, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0041] Embodiment 1

[0042] As Figures 1 to 10 shown, the present application discloses a liquid-cooled energy storage battery system, including:

[0043] An energy storage rack 1 for placing battery modules 2, where the battery modules 2 include drawer boxes 8 and a plurality of battery pack components 9, and a plurality of the battery pack components 9 are placed inside the drawer boxes 8;

[0044] A liquid storage box body 6 for providing a cooling medium to the inside of the drawer box 8;

[0045] A heat exchange chamber 3, in which a heat exchanger coil 4 is provided, and opposite ends of the heat exchanger coil 4 are respectively communicated with the drawer box 8 and the liquid storage box body 6 to form a loop;

[0046] A power pump 5 is arranged between the liquid storage box body 6 and the inlet pipe of the heat exchanger coil 4 for providing power for the cooling medium to flow between the liquid storage box body 6 and the drawer box 8;

[0047] The battery pack component 9 includes an energy storage battery component 91 and a battery pack housing 92. A phase change material accommodation cavity 9203 is arranged inside the battery pack housing 92, and a phase change material is filled in the phase change material accommodation cavity 9203. The phase change material is composed of a crystalline hydrate of calcium salt, magnesium salt, or aluminum salt, and undergoes solid-liquid phase change between 10°C and 40°C.

[0048] The liquid-cooled energy storage battery system described in this application ensures that the battery module 2 is in a fixed and safe state during operation by placing the battery module 2 containing the drawer box 8 and several battery pack components 9 on the energy storage rack 1. By arranging the liquid inlet pipe, the power pump 5, the heat exchanger coil 4, the drawer box 8, the liquid outlet pipe and several switching valves, a cooling medium circulation loop is formed between the liquid storage box body 6 and the drawer box 8. During use, the cooling medium inside the liquid storage box body 6 flows into the drawer box 8 under the action of the power pump 5 to cool and dissipate the heat of the battery pack components 9 inside the drawer box 8. Among them, the cooling medium acts on the phase change material on the battery pack housing 92 in the drawer box 8, and the phase change material is set as a hydrated crystal of calcium salt, magnesium salt or aluminum salt that undergoes solid-liquid phase change at 10°C to 40°C. When the phase change material is in the high-temperature phase state, cooling medium is introduced into the drawer box 8 for cooling. When the phase change material is in the low-temperature phase state, the cooling medium in the drawer box 8 is pumped into the liquid storage box body 6 for storage, so as to ensure that the energy storage battery components 91 inside the battery pack housing 92 are always maintained within a suitable operating temperature range.

[0049] In the liquid-cooled energy storage battery system described in this application, through the combined use of liquid cooling cycle and phase change material, the system can efficiently take away and dissipate the heat generated by the battery, ensure that the battery operates within a suitable temperature range, delay battery aging, extend the service life of the battery, reduce the risk of battery overheating, and improve the safety of the entire energy storage system.

[0050] As a preferred example of this application, the drawer box 8 is plugged and connected or separated from the heat exchange chamber 3 through a quick connector 7, and the drawer box 8 can slide or be fixed relative to the energy storage rack 1. In the example of this application, a first rear plate 81 is provided at the rear end of the drawer box 8. Correspondingly, a first front plate 31 is provided at the front end of the heat exchange chamber 3. A quick female connector 71 is provided on the first front plate 31, and a quick male connector 72 is provided on the first rear plate 81. When the drawer box 8 slides from the front end to the rear end in place on the energy storage rack 1, the quick male connector 72 is flexibly plugged into the quick female connector 71 for sealed connection. In the example of this application, the drawer box 8 and the heat exchange chamber 3 are plugged and connected or separated through the quick connector 7, making the replacement or maintenance of the battery pack components 9 extremely convenient. When it is necessary to replace or maintain the battery pack components 9, simply slide the drawer box 8 out of the energy storage rack 1 and disconnect the quick connector 7, without a complex disassembly process. The quick connector 7 is designed as a structure of a quick male connector 72 and a quick female connector 71 with flexible connection, ensuring a quick and tight connection between the drawer box 8 and the heat exchange chamber 3. When the drawer box 8 slides in place, the quick male connector 72 is flexibly plugged into the quick female connector 71 to form a sealed connection, ensuring that the cooling medium can circulate smoothly between the liquid storage box body 6, the heat exchange chamber 3 and the drawer box 8, so as to achieve efficient heat dissipation of the battery pack components 9.

[0051] This setting realizes convenient plug-in connection or separation between the drawer box 8 and the heat exchange chamber 3 by introducing the design of the quick connector 7, greatly simplifies the replacement and maintenance process of the battery pack assembly 9, ensures a fast, tight and sealed connection between the drawer box 8 and the heat exchange chamber 3, ensures the smooth circulation of the cooling medium, thereby achieving efficient heat dissipation of the battery pack assembly, and further improving the overall performance and maintainability of the energy storage system.

[0052] As a preferred example of the present application, the quick-connect female connectors 71 are arranged in two upper and lower rows on the first front plate 31, and correspondingly, the quick-connect male connectors 72 are arranged in two upper and lower rows on the first rear plate 81. In the example of the present application, one or more quick-connect male connectors 72 are arranged in each row, and the quick-connect male connectors 72 in the upper row are used to flow the cooling medium into the drawer box 8 in the connected state, and the quick-connect male connectors 72 in the lower row are used to flow the cooling medium out of the drawer box 8 in the connected state. As a specific example of the present application, four quick-connect male connectors 72 or quick-connect female connectors 71 are arranged in each row. By respectively providing upper and lower rows of quick-connect female connectors 71 and quick-connect male connectors 72 on the first front plate 31 and the first rear plate 81, and limiting them to the upper row for the inflow of cooling medium and the lower row for the outflow of cooling medium, orderly and efficient circulation of the cooling medium in the drawer box 8 is achieved, which helps to more quickly remove the heat generated by the battery pack assembly 9, thereby improving the cooling efficiency, increasing the flow path of the cooling medium, and reducing the risk of failure of the entire cooling system due to a single connector failure. At the same time, mutual interference between connectors is avoided, the spatial layout is optimized, maintenance and inspection are facilitated, and the cooling medium is ensured to flow in and out smoothly.

[0053] As a preferred example of the present application, the battery pack shell 92 includes a first inner plate 9201, a first outer plate 9202, a first inner bottom plate 9204 and a first outer bottom plate 9205. The first inner bottom plate 9204 is arranged at the lower end of the first inner plate 9201, and the first outer bottom plate 9205 is arranged at the lower end of the first outer plate 9202. The first inner plate 9201, the first outer bottom plate 9205 and the first inner plate 9201 and the first inner bottom plate 9204 surround a phase change material accommodating cavity 9203 with an upper end opening. This arrangement discloses a frame structure in which the battery pack shell 92 forms a phase change material receiving chamber 9203. On the one hand, it enhances the overall strength of the battery pack and improves its impact and pressure resistance in various usage environments, thereby protecting the internal energy storage battery assembly 91 from external damage. On the other hand, it also facilitates the replenishment and replacement of phase change materials, reducing maintenance costs and time. At the same time, the phase change material receiving chamber 9203 includes a design in four side wall directions and a bottom wall, which further enhances the thermal management efficiency of the battery pack assembly 9 and helps to optimize the operating temperature environment of the energy storage battery assembly 91, thereby improving the battery's use efficiency and safety.

[0054] As a preferred example of the present application, a sealing plug 93 is provided at the upper end of the phase change material accommodating cavity 9203. The sealing plug 93 includes a sealing insertion plate 9301 and a sealing baffle 9302. The sealing insertion plate 9301 is hermetically inserted into the phase change material accommodating cavity 9203, and the sealing baffle 9302 is limited and fixed at the upper end of the battery pack housing 92. As a specific example of the present application, the sealing plug 93 is integrally formed of a polymer resin material (such as rubber). The sealing insertion plate 9301 of the sealing plug 93 is hermetically inserted into the phase change material accommodating cavity 9203 with an interference fit. The sealing insertion plate 9301 and the sealing baffle 9302 are designed in a T shape or an L shape. This setting effectively prevents the leakage of the phase change material and the intrusion of external moisture and dust by providing the sealing plug 93 at the opening at the upper end of the phase change material accommodating cavity 9203, ensuring the safety and reliability of the use of the phase change material in the phase change material accommodating cavity 9203, and further improving the stability and safety of the working environment of the energy storage battery assembly 91.

[0055] As a preferred example of the present application, a support assembly 9206 is provided between the first inner bottom plate 9204 and the first outer bottom plate 9205. Specifically, as an example of the present application, the support assembly 9206 includes a transverse grid 9207 and a longitudinal grid 9209. The transverse grid 9207 and the longitudinal grid 9209 are arranged perpendicularly. A number of first communication holes 9208 are provided on the transverse grid 9207, and the first communication holes 9208 are provided at a position close to the middle on the transverse grid 9207. A number of the first communication grooves 9210 are provided on the longitudinal grid 9209, and the first communication grooves 9210 are provided at the ends of the longitudinal grid 9209 close to the first inner bottom plate 9204 and / or the first outer bottom plate 9205. Preferably, the first communication grooves 9210 are semicircularly arranged. By providing the support assembly 9206 composed of the transverse grid 9207 and the longitudinal grid 9209 between the first inner bottom plate 9204 and the first outer bottom plate 9205, on the one hand, the stability and load-bearing capacity of the bottom structure of the battery pack housing 92 are effectively enhanced, the structural strength and stability of the frame structure forming the phase change material accommodating cavity 9203 are improved, and the energy storage battery assembly 91 inside the battery pack housing 92 is protected from damage. At the same time, a number of first communication holes 9208 are provided on the transverse grid 9207, and a number of first communication grooves 9210 are provided on the longitudinal grid 9209, which helps the circulation of the phase change material medium inside the battery pack assembly 9, promotes the uniform distribution and effective dissipation of heat, thereby improving the thermal management efficiency of the battery, extending the service life of the battery, and further improving the overall performance and safety of the battery pack assembly 9.

[0056] As a preferred example of the present application, a support base 94 is provided at the bottom of the battery pack housing 92. The support base 94 includes a first connection portion 9401 and a first support portion 9402. The first connection portion 9401 passes through the first outer bottom plate 9205 and is threadedly connected to the first inner bottom plate 9204. A sealing layer 9403 is sleeved outside the first support portion 9402 for sealing connection between the first support portion 9402 and the first outer bottom plate 9205. As a specific example of the present application, the cross-section of the first support portion 9402 is gradually enlarged from the end close to the first connection portion 9401 to the end far from the first connection portion 9401, and the lower end of the first support portion 9402 is arranged outside the bottom of the battery pack housing 92. Preferably, a plurality of support bases 94 are provided at the bottom of the battery pack housing 92. This setting further enhances the structural strength of the bottom of the battery pack housing 92, enabling it to withstand greater weight and stress, improving the overall structural stability of the battery pack assembly 9. At the same time, it also allows the bottom of the battery pack assembly 9 to be completely immersed and covered by the cooling medium in the drawer box 8 during cooling, thereby further enhancing the cooling efficiency and temperature control performance of the battery pack assembly 9.

[0057] As a preferred example of the present application, the energy storage battery assembly 91 includes a plurality of battery cells 9101. After assembly, a first end plate 9102 and a second end plate 9103 are provided at opposite ends of the battery cells 9101, and a tie strap 9104 is wound around the outside of the first end plate 9102, the second end plate 9103, and the battery cells 9101. Preferably, two layers of tie straps 9104 are provided. This setting ensures the best arrangement and fixation of the battery cells in a limited space through a reasonable tie strap layout and fastening method, optimizing the space utilization rate of the energy storage battery assembly 91, facilitating maintenance and management, and at the same time increasing the contact area between the energy storage battery assembly 91 and the battery pack housing 92, improving the thermal management efficiency of the entire system.

[0058] As a preferred example of the present application, the heat exchange chamber 3 is communicated with an external refrigeration device for cooling and dissipating heat from the heat exchanger coil 4 inside it. As a preferred example of the present application, the external refrigeration device can introduce cooled air into the heat exchange chamber 3. The cold air enters the heat exchange chamber 3 and cools down the cooling medium in the heat exchanger coil 4, thereby preventing the temperature of the cooling medium in the heat exchanger coil 4 from being too high when it flows into the drawer box 8 and affecting the temperature control efficiency. As an example of the present application, the cooling medium inside the liquid storage box body 6 is water.

[0059] This setting passes the cooled air into the heat exchange chamber 3 through an external refrigeration device. The cold air exchanges heat with the cooling medium in the heat exchanger coil 4, effectively reducing the temperature of the cooling medium, improving the temperature control efficiency, prolonging the service life of the battery pack assembly 9, enhancing the stability and reliability of the system, and saving energy and protecting the environment.

[0060] The liquid-cooled energy storage battery system described in this application achieves remarkable heat dissipation effects and effective regulation of the battery temperature through innovative structural design, significantly improving the service life and performance of the battery. By ingeniously adopting the quick-connect plug design, it realizes the convenient connection and rapid separation between the drawer box and the heat exchange chamber, greatly simplifying the replacement and maintenance processes of the battery pack assembly. It can be applied to the field of energy storage battery cabinets or electric vehicles, improving the maintainability and operation convenience of the system.

[0061] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A liquid-cooled energy storage battery system, characterized in that: include: An energy storage rack (1) is used to place a battery module (2), wherein the battery module (2) comprises a drawer box (8) and a plurality of battery pack assemblies (9), wherein the plurality of battery pack assemblies (9) are placed inside the drawer box (8); A liquid storage box body (6) is used to provide cooling medium to the interior of the drawer box (8); A heat exchange chamber (3) is provided inside which a heat exchanger coil (4) is arranged, and opposite ends of the heat exchanger coil (4) are respectively connected to the drawer box (8) and the liquid storage box body (6) to form a loop; A power pump (5) is arranged between the liquid storage box body (6) and the liquid inlet pipe of the heat exchanger coil (4) and is used to provide power for the cooling medium to flow between the liquid storage box body (6) and the drawer box (8); The battery pack assembly (9) comprises an energy storage battery assembly (91) and a battery pack shell (92), wherein a phase change material accommodating chamber (9203) is arranged inside the battery pack shell (92), and the phase change material accommodating chamber (9203) is filled with a phase change material, and the phase change material undergoes a solid-liquid phase change between 10°C and 40°C.

2. The liquid-cooled energy storage battery system according to claim 1, characterized in that: The drawer box (8) is plug-connected or separated with the heat exchange chamber (3) via a quick connector (7), and the drawer box (8) can slide or be fixed relative to the energy storage rack (1).

3. The liquid-cooled energy storage battery system according to claim 2, characterized in that: A first rear plate (81) is arranged at the rear end of the drawer box (8), and correspondingly, a first front plate (31) is arranged at the front end of the heat exchange chamber (3), a quick-connect female head (71) is arranged on the first front plate (31), and a quick-connect male head (72) is arranged on the first rear plate (81); when the drawer box (8) slides from the front end to the rear end of the energy storage rack (1) into place, the quick-connect male head (72) is flexibly plugged into the quick-connect female head (71) for sealed communication.

4. The liquid-cooled energy storage battery system according to claim 3, characterized in that: The quick-connect female connectors (71) are arranged in two upper and lower rows on the first front plate (31), and correspondingly, the quick-connect male connectors (72) are arranged in two upper and lower rows on the first rear plate (81).

5. The liquid-cooled energy storage battery system according to any one of claims 1 to 4, characterized in that: The battery pack shell (92) includes a first inner plate (9201), a first outer plate (9202), a first inner bottom plate (9204) and a first outer bottom plate (9205), wherein the first inner bottom plate (9204) is arranged at the lower end of the first inner plate (9201), and the first outer bottom plate (9205) is arranged at the lower end of the first outer plate (9202); the first inner plate (9201), the first outer bottom plate (9205) and the first inner plate (9201) and the first inner bottom plate (9204) enclose a phase change material accommodating cavity (9203) with an upper end opening.

6. The liquid-cooled energy storage battery system according to claim 5, characterized in that: A sealing plug (93) is provided at the upper end of the phase change material accommodating cavity (9203), and the sealing plug (93) comprises a sealing plug plate (9301) and a sealing baffle (9302). The sealing plug plate (9301) is sealingly plugged into the phase change material accommodating cavity (9203), and the sealing baffle (9302) is fixedly positioned at the upper end of the battery pack housing (92).

7. The liquid-cooled energy storage battery system according to claim 6, characterized in that: A support assembly (9206) is disposed between the first inner bottom plate (9204) and the first outer bottom plate (9205).

8. The liquid-cooled energy storage battery system according to claim 7, characterized in that: The support assembly (9206) includes a transverse grille (9207) and a longitudinal grille (9209), wherein the transverse grille (9207) and the longitudinal grille (9209) are arranged vertically, a plurality of first connecting holes (9208) are provided on the transverse grille (9207), and a plurality of first connecting grooves (9210) are provided on the longitudinal grille (9209).

9. The liquid-cooled energy storage battery system according to claim 8, characterized in that: The first connecting hole (9208) is arranged near the middle of the transverse grille (9207), and the first connecting groove (9210) is arranged at the end of the longitudinal grille (9209) close to the first inner bottom plate (9204) and / or the first outer bottom plate (9205), and the first connecting groove (9210) is arranged in a semicircular shape.

10. The liquid-cooled energy storage battery system according to claim 9, characterized in that: A support base (94) is provided at the bottom of the battery pack shell (92), and the support base (94) includes a first connecting portion (9401) and a first supporting portion (9402), wherein the first connecting portion (9401) passes through the first outer bottom plate (9205) and is threadedly connected to the first inner bottom plate (9204), and a sealing layer (9403) is sleeved on the outer side of the first supporting portion (9402) for sealing the first supporting portion (9402) and the first outer bottom plate (9205).

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