Energy storage system

Abstract

The utility model relates to an energy storage system, which comprises a first battery module, a second battery module and a cooling assembly, the first battery module and the second battery module are stacked along a first direction, the first battery module comprises a first bottom plate, and the cooling assembly is arranged on the first bottom plate. The first cooling piece is arranged on the first bottom plate and used for cooling the surfaces, close to the first cooling piece, of the first battery module and the second battery module at the same time, on one hand, cooling of the first battery module and the second battery module can be achieved at the same time, and the cooling efficiency of the energy storage system is improved; on the other hand, cooling of the two battery modules can be achieved through one cooling piece, the number of the cooling pieces can be reduced, and the energy density of the energy storage system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an energy storage system. Background Art

[0002] In existing energy storage systems, in order to prevent the normal operation of the energy storage system from being affected by excessively high ambient temperature or heating of the battery, the energy storage system is sometimes required to be cooled, thereby reducing the operating temperature of the energy storage system and ensuring that the energy storage system operates at a certain temperature. However, in existing energy storage systems, the cooling device is large in size and has poor cooling effect, resulting in low efficiency and low energy density of the energy storage system. Utility Model Content

[0003] Based on this, it is necessary to provide an energy storage system that improves the above defects in order to address the problems of low cooling efficiency and energy density of the energy storage system in the prior art.

[0004] The present application provides an energy storage system, comprising:

[0005] A first battery module, comprising a first receiving assembly and a first battery assembly received in the first receiving assembly, wherein the first receiving assembly comprises a first bottom plate disposed at the bottom of the first battery assembly along a first direction;

[0006] A second battery module is stacked along the first direction and disposed on a side of the first battery module close to the first bottom plate; and

[0007] The cooling assembly includes a first cooling member disposed on the first bottom plate, and is used for simultaneously cooling the first battery module and the surface of the second battery module close to the first cooling member.

[0008] By arranging a first cooling element on the first bottom plate to simultaneously cool the surfaces of the first battery module and the second battery module close to the first cooling element, on the one hand, the first battery module and the second battery module can be cooled simultaneously, thereby improving the cooling efficiency of the energy storage system; on the other hand, cooling of two battery modules can be achieved by one cooling element, thereby reducing the number of cooling elements and improving the energy density of the energy storage system.

[0009] In some embodiments, the first cooling member is disposed on both sides of the first bottom plate along the first direction.

[0010] In some embodiments, a heat conductive member is disposed on a side of the second battery module close to the first battery module.

[0011] In some embodiments, the heat conductive member is made of an insulating material or an insulating member is disposed on a side of the heat conductive member close to the second battery module.

[0012] In some embodiments, the first containing assembly further includes a first side plate surrounding the first bottom plate, and the cooling assembly further includes a second cooling member disposed on the first side plate.

[0013] In some embodiments, a first cooling channel is disposed in the first cooling member, a second cooling channel is disposed in the second cooling member, and the first cooling channel and the second cooling channel are connected to each other.

[0014] In some embodiments, cooling liquid is disposed in the first cooling channel and the second cooling channel.

[0015] In some embodiments, the second battery module includes a second containing assembly and a second battery assembly contained in the second containing assembly, the second containing assembly includes a second side plate surrounding the second battery assembly, and the cooling assembly includes a third cooling member disposed on the second side plate.

[0016] In some embodiments, a third cooling channel is disposed on the third cooling member, and the third cooling channel is filled with a phase-change refrigerant.

[0017] In some embodiments, the first direction is the direction of gravity, the third cooling channel extends along the first direction, and the third cooling member and the first cooling member may be heat-conductingly arranged therebetween.

[0018] In some embodiments, a bending portion is provided at one end of the third cooling member close to the first cooling member, and the bending portion is bent toward a side close to the first cooling member to overlap with the first cooling member.

[0019] In some embodiments, the second accommodating assembly further includes a second bottom plate, the second side plate is arranged around the second bottom plate to form a space for accommodating the second battery assembly, and the cooling assembly further includes a fourth cooling member arranged on the second bottom plate.

[0020] In some embodiments, the energy storage system further includes an installation assembly, the installation assembly including a first installation member and a second installation member, the first installation member and the second installation member are spaced apart along a second direction to form an installation space for installing the second battery module and the first battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the energy storage system of the utility model embodiment;

[0022] Figure 2 This is a schematic diagram of the positions of the first battery module and the second battery module in an embodiment of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the bottom plate in the embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the mechanism of the third cooling element in the embodiment of the utility model;

[0025] Figure 5 for Figure 4 A partial enlarged view of position A.

[0026] Description of reference numerals:

[0027] 1 first battery module; 11 first receiving assembly, 111 first bottom plate, 112 first side plate; 12 first battery assembly;

[0028] 2 second battery module; 21 second receiving assembly, 211 second bottom plate, 212 second side plate; 22 second battery assembly;

[0029] 3 cooling assembly; 31 first cooling element; 32 second cooling element; 33 third cooling element, 331 third cooling channel, 332 bending portion;

[0030] 4. Heat conducting parts;

[0031] 5 mounting assembly, 51 first mounting frame, 52 second mounting frame;

[0032] X first direction;

[0033] Y second direction. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0040] In order to more clearly understand the embodiments of the present application, the following Figures 1 to 4 The embodiments of the present application are described in detail.

[0041] like Figures 1 to 4As shown, the present application provides an energy storage system, including a first battery module 1, a second battery module 2 and a cooling assembly 3. The first battery module 1 includes a first accommodating assembly 11 and a first battery assembly 12 accommodated in the first accommodating assembly 11, the first accommodating assembly 11 includes a first bottom plate 111 arranged at the bottom of the first battery assembly 12 along a first direction X; the second battery module 2 is stacked and arranged on one side of the first battery module 1 close to the first bottom plate 111 along the first direction X; the cooling assembly 3 includes a first cooling member 31 arranged on the first bottom plate 111, which is used to simultaneously cool the surfaces of the first battery module 1 and the second battery module 2 close to the first cooling member.

[0042] The first receiving component 11 refers to a structure with a receiving cavity, and the shape of the first receiving component 11 can be a regular shape such as a cylinder or a cube, or an irregular shape, which is not limited in this application. The material of the first receiving component 11 is also not limited in this embodiment of the application.

[0043] The first battery assembly 12 refers to an assembly composed of multiple battery cells, wherein the battery cells can be connected in series, in parallel, or in a combination of series and parallel, and this application does not limit this. It should be noted that the battery cells can be lithium batteries or sodium batteries, and this application does not limit this. The shape of the battery cells can be cylindrical or square.

[0044] The first battery module 1 and the second battery module 2 may be batteries of the same type or batteries of different types.

[0045] The cooling component 3 is a component that can play a cooling role. Specifically, the cooling component 3 can be a component that achieves cooling through liquid or a component that achieves cooling through gas, and the embodiment of the present application does not limit this.

[0046] The first cooling member 31 is disposed on the first bottom plate 111. In some embodiments, the first cooling member 31 can be integrally formed and integrated on the first bottom plate 111, thereby further reducing the volume of the first bottom plate 111 and the cooling member 31 and increasing the energy density of the energy storage system. In other embodiments, the first cooling member 31 can also be disposed on the surface of the first bottom plate 111, which can increase the strength of the first bottom plate 111 on the one hand, and reduce the difficulty of manufacturing the first bottom plate 111 and the cooling member 31 on the other hand.

[0047] The first cooling member 31 is provided on the first bottom plate 111 to cool the first battery module 1 and the surface of the second battery module 2 close to the first cooling member 31 at the same time, that is, the first cooling member 31 can cool the bottom of the first battery module and the top of the second battery module at the same time. On the one hand, the cooling efficiency of the energy storage system can be improved to obtain a better cooling effect; on the other hand, the cooling of two battery modules can be achieved by one cooling member, which can reduce the number of cooling members and improve the energy density of the energy storage system.

[0048] In some embodiments, the first base plate 111 is made of a heat-conductive material, and the first cooling member 31 is arranged on one side of the first base plate 111. The temperature is transferred to the side where the first cooling member 31 is not arranged through heat conduction, thereby achieving cooling of the bottom of the first battery module 1 and the top of the second battery module 2. This can reduce the number of first cooling members 31 and further improve the energy density of the energy storage system.

[0049] like Figure 3 As shown, in some embodiments, both sides of the first base plate 111 along the first direction X are provided with a first cooling member 31 .

[0050] By setting up two first cooling members 31 to cool the bottom of the first battery module 1 and the top of the second battery module 2 respectively, the cooling efficiency can be improved, and the two first cooling members 31 can be controlled respectively according to different conditions of the first battery module 1 and the second battery module 2, thereby achieving precise control of the temperature of the first battery module 1 and the second battery module 2.

[0051] like Figure 2 As shown, in some embodiments, a heat conducting member 4 is disposed on a side of the second battery module 2 close to the first battery module 1 .

[0052] In some embodiments, the heat conductive member 4 may be a gasket with a heat conductive function, which is disposed between the first cooling member 31 and the second battery module 2. In other embodiments, the heat conductive member 4 may also be a heat conductive adhesive, which is applied to a side of the second battery module 2 close to the first cooling member 31 and / or to a side of the first cooling member 31 close to the second battery module 2.

[0053] By arranging a heat conductive member between the first cooling member 31 and the second battery module 2 , the heat generated by the second battery module 2 can be transferred to the first cooling member 31 through the heat conductive member 4 , thereby cooling the second battery module 2 .

[0054] In some embodiments, the heat conductive member 4 is made of an insulating material or an insulating member is disposed on a side of the heat conductive member close to the second battery module.

[0055] In some embodiments, by setting the heat conducting member 4 to be an insulating material, the second battery module 2 can be insulated and protected to prevent the second battery module 2 from short-circuiting due to insulation failure. Figure 3 As shown, in other embodiments, an insulating member is provided on the side of the heat conductor 4 close to the second battery module 2. The insulating member may be an insulating pad, which is provided on the side of the heat conductor 4 close to the second battery module 2. The insulating member may also be an insulating film or insulating glue, which is attached to the side of the heat conductor 4 close to the second battery module 2 or to the side of the second battery module 2 close to the heat conductor 4.

[0056] In some embodiments, the output pole of the second battery module 2 is arranged toward the first cooling member 31. At this time, the heat conductive member 4 is arranged to be an insulating material to prevent the output poles from being connected through the heat conductive member 4 and causing a short circuit.

[0057] In other embodiments, the output pole of the second battery module 2 is not arranged toward the first cooling member 31. In this case, setting the heat conductor 4 to an insulating material can prevent the battery housing from being connected to the first cooling member 31 when the insulation fails, thereby preventing a short circuit from occurring, thereby affecting the normal use of the second battery module 2.

[0058] like Figure 2 As shown, in some embodiments, the first accommodating assembly 11 further includes a first side plate 112 arranged around the first bottom plate 111 , and the cooling assembly 3 further includes a second cooling member 32 arranged on the first side plate 112 .

[0059] Similarly, the second cooling member 32 can be integrally formed and integrated on the first side plate 112 , or can be disposed on the surface of the first side plate 112 .

[0060] By arranging the second cooling member 32 on the first side plate 112, the first battery assembly 12 can be cooled around, and the working temperature of the first battery module 1 can be further controlled to ensure working efficiency.

[0061] In some embodiments, a first cooling channel is disposed in the first cooling member 31 , a second cooling channel is disposed in the second cooling member 32 , and the first cooling channel and the second cooling channel are connected to each other.

[0062] By connecting the first cooling channel and the second cooling channel, the same cooling medium input port and output port can be used to replace the cooling medium in the first cooling member 31 and the second cooling member 32, so as to simplify the structure of the cooling assembly 3. The cooling medium can be liquid or gas, which is not limited in the embodiment of the present application.

[0063] In some embodiments, the cooling assembly 3 further includes a flow distributor for controlling the distribution of cooling medium in the first cooling channel and the second cooling channel to ensure the operating temperature of the first battery module 1 .

[0064] In some embodiments, cooling liquid is disposed in the first cooling channel and the second cooling channel.

[0065] The cooling function is achieved by providing coolant in the first cooling channel and the second cooling channel. On the one hand, coolant such as water is easy to obtain, and on the other hand, water has a large specific heat capacity and can take away more heat, resulting in a better cooling effect. It should be noted that materials such as rust inhibitors can be added to the coolant as needed to improve the usability of the coolant.

[0066] like Figure 2 As shown, in some embodiments, the second battery module 2 includes a second accommodating assembly 21 and a second battery assembly 22 accommodated in the second accommodating assembly 21, the second accommodating assembly 21 includes a second side plate 212 surrounding the second battery assembly 22, and the cooling assembly 3 includes a third cooling member 33 arranged on the second side plate 212.

[0067] Similarly, the second containing component 21 refers to a structure with a containing cavity, and the shape of the second containing component 21 can be a regular shape such as a cylinder or a cube, or an irregular shape, which is not limited in this application. The material of the second containing component 21 is also not limited in this embodiment of the application.

[0068] Similarly, the second battery assembly 22 refers to an assembly composed of multiple battery cells, wherein the battery cells can be connected in series, in parallel, or in a combination of series and parallel, and this application does not limit this. It should be noted that the battery cell can be a lithium battery or a sodium battery, and this application does not limit this. The shape of the battery cell can be cylindrical or square.

[0069] The cooling assembly 3 includes a third cooling member 33 disposed on the second side plate 212 . The third cooling member 33 may be integrally formed and integrated on the second side plate 212 , or may be disposed on the surface of the second side plate 212 .

[0070] By providing the third cooling member 33 , the surroundings of the second battery module 2 can be cooled, thereby ensuring the operating temperature of the second battery module 2 and improving the operating performance.

[0071] like Figure 5 As shown, in some embodiments, a third cooling channel 331 is provided on the third cooling member 33 , and the third cooling channel 331 is filled with a phase-change refrigerant.

[0072] Phase-change refrigerant refers to a reagent that can be vaporized at high temperatures and liquefied at low temperatures to release heat. By arranging the phase-change refrigerant in the third cooling channel 331, the phase-change refrigerant can be vaporized to absorb heat when the temperature of the second battery module 2 is higher than the set value, thereby reducing the heat of the second battery module 2, thereby achieving the function of controlling the operating temperature of the second battery module 2.

[0073] In some embodiments, a phase-change refrigerant may also be provided in the first cooling channel, the second cooling channel, and the third cooling channel to reduce the operating temperature of the energy storage system. It should be noted that the cooling medium in the first cooling channel, the second cooling channel, the third cooling channel, and the fourth cooling channel may be the same cooling medium or different cooling medium, and the embodiments of the present application are not limited to this.

[0074] like Figure 5 As shown, in some embodiments, the first direction X is the gravity direction, the third cooling channel 331 extends along the first direction X, and the third cooling member 33 and the first cooling member 31 can be heat-conductingly arranged.

[0075] The third cooling channel 331 is extended along the first direction X (i.e., the direction of gravity). When the temperature of the second battery module 2 is higher than the set value, the phase change refrigerant can be vaporized to absorb heat to reduce the temperature of the second battery module 2, while the vaporized phase change refrigerant flows along the third cooling channel; when the vaporized phase change refrigerant spreads to the side of the third cooling member 33 close to the first cooling member 31, since the third cooling member 33 and the first cooling member 31 can be heat-conductingly arranged, the low temperature in the first cooling member 31 can be conducted to the third cooling member 33, thereby causing the vaporized phase change refrigerant to encounter low temperature and liquefy; the liquefied phase change refrigerant moves downward along the third cooling channel 331 under the action of gravity, and absorbs the heat generated by the second battery module during the movement together with the liquefied phase change refrigerant. When the liquefied phase change refrigerant reaches the preset temperature, it is vaporized again, and this cycle is repeated to achieve the effect of cooling the second battery module 2.

[0076] like Figure 5 As shown, in some embodiments, a bending portion 332 is provided at one end of the third cooling member 33 close to the first cooling member 31 , and the bending portion 332 is bent toward a side close to the first cooling member 31 and overlaps with the first cooling member 31 .

[0077] The bending portion 332 is provided to achieve a heat conduction arrangement between the third cooling member 33 and the first cooling member 31 , and the structure is simple and reliable.

[0078] In other embodiments, the third cooling element and the first cooling element may be connected via a connecting element made of a heat-conducting material to achieve liquefaction of the phase-change refrigerant when cooled.

[0079] like Figure 2 As shown, in some embodiments, the second accommodating assembly 21 further includes a second bottom plate 211, and the second side plate 212 is arranged around the second bottom plate 211 to form a space for accommodating the second battery assembly 22, and the cooling assembly 3 further includes a fourth cooling member arranged on the second bottom plate 211. The fourth cooling member can also be arranged in communication with the third cooling member 33, so that the same cooling medium input port and output port can be used to replace the cooling medium in the third cooling member 33 and the fourth cooling member, so as to simplify the structure of the cooling assembly 3.

[0080] The second side plate 212 is disposed around the second bottom plate 211 . The second side plate 212 and the second bottom plate 211 may be connected by a non-detachable connection such as welding or riveting, or a detachable connection such as clamping or bolting.

[0081] Similarly, the fourth cooling member can be integrally formed and integrated on the second bottom plate 211, or can be arranged on the surface of the second bottom plate 211. The fourth cooling member can be a liquid cooling member, an air cooling member, or a member that achieves cooling through a phase change refrigerant, which is not limited in the present embodiment.

[0082] The fourth cooling member can be provided to cool the bottom of the second battery module 2. The first cooling member 31, the third cooling member 33 and the fourth cooling member can cool the top, side and bottom of the second battery module 2 to ensure the operating temperature of the second battery module 2.

[0083] like Figure 1 As shown, in some embodiments, in some embodiments, it also includes an installation component 5, and the installation component 5 includes a first installation component 51 and a second installation component 52, and the first installation component 51 and the second installation component 52 are arranged at intervals along the second direction Y to form an installation space for installing the second battery module 2 and the first battery module 1.

[0084] The mounting assembly 5 is a component used to mount and fix the first battery module 1 and the second battery module 2. The shape of the mounting assembly 5 can be cylindrical or square. In some embodiments, the mounting assembly 5 is made of an insulating material, or an insulating member is provided between the mounting assembly 5 and the battery module to insulate and protect the first battery module 1 and the second battery module 2.

[0085] The second direction Y refers to a direction perpendicular to the first direction X, that is, the second direction Y can be any direction within a plane perpendicular to the first direction X.

[0086] The first mounting member 51 and the second mounting member 52 are spaced apart along the second direction Y to form an installation space for installing the second battery module 2 and the first battery module 1, so that the first battery module 1 and the second battery module 2 are more stable and reliable when stacked.

[0087] It should be noted that if Figure 1 As shown, according to specific needs, there may be more than two battery modules, and the multiple battery modules are stacked along the first direction X. Each battery module also includes a bottom plate and a side plate, and cooling parts may also be provided on the bottom plate and the side plate as needed. The stacking method and cooling method between the battery modules refer to the first battery module 1 and the second battery module 2.

[0088] Specifically, Figures 1 to 5 As shown, first, a battery module is manufactured, and a cooling assembly is arranged on the bottom plate and side plate of the battery module. Then, multiple battery modules are stacked and installed in the installation space formed by the installation assembly according to specific needs, and a heat conductor and an insulating member are arranged between the two battery modules. After the installation is completed, the cooling member located on the floor can cool the bottom of the upper battery module and the top of the lower battery module at the same time, with a simple structure and high energy density.

[0089] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0090] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An energy storage system, characterized in that: The energy storage system comprises: A first battery module, comprising a first receiving assembly and a first battery assembly received in the first receiving assembly, wherein the first receiving assembly comprises a first bottom plate disposed at the bottom of the first battery assembly along a first direction; A second battery module is stacked along the first direction and disposed on a side of the first battery module close to the first bottom plate; and The cooling assembly includes a first cooling member disposed on the first bottom plate, and is used to simultaneously cool the first battery module and the surface of the second battery module close to the first cooling member.

2. The energy storage system according to claim 1, characterized in that: The first cooling member is disposed on both sides of the first bottom plate along the first direction.

3. The energy storage system according to claim 1 or 2, characterized in that: A heat conducting member is disposed on a side of the second battery module close to the first battery module.

4. The energy storage system according to claim 3, characterized in that: The heat conducting member is made of insulating material or an insulating member is disposed on a side of the heat conducting member close to the second battery module.

5. The energy storage system according to claim 1, characterized in that: The first accommodating assembly further includes a first side plate arranged around the first bottom plate, and the cooling assembly further includes a second cooling member arranged on the first side plate.

6. The energy storage system according to claim 5, characterized in that: The first cooling member is provided with a first cooling channel, the second cooling member is provided with a second cooling channel, and the first cooling channel and the second cooling channel are connected to each other.

7. The energy storage system according to claim 6, characterized in that: Cooling liquid is arranged in the first cooling channel and the second cooling channel.

8. The energy storage system according to claim 1, characterized in that: The second battery module includes a second containing assembly and a second battery assembly contained in the second containing assembly, the second containing assembly includes a second side plate surrounding the second battery assembly, and the cooling assembly includes a third cooling member disposed on the second side plate.

9. The energy storage system according to claim 8, characterized in that: The third cooling member is provided with a third cooling channel, and the third cooling channel is filled with a phase-change refrigerant.

10. The energy storage system according to claim 9, characterized in that: The first direction is the direction of gravity, the third cooling channel extends along the first direction, and the third cooling member and the first cooling member can be heat-conductingly arranged therebetween.

11. The energy storage system according to claim 10, characterized in that: A bending portion is provided at one end of the third cooling member close to the first cooling member, and the bending portion is bent toward a side close to the first cooling member to overlap with the first cooling member.

12. The energy storage system according to claim 8, characterized in that: The second accommodating assembly further includes a second bottom plate, the second side plates are arranged around the second bottom plate to form a space for accommodating the second battery assembly, and the cooling assembly further includes a fourth cooling member arranged on the second bottom plate.

13. The energy storage system according to claim 1, characterized in that: The energy storage system further includes a mounting assembly, which includes a first mounting member and a second mounting member, wherein the first mounting member and the second mounting member are spaced apart along a second direction to form a mounting space for mounting the second battery module and the first battery module.

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