energy storage device

Abstract

This application discloses an energy storage device, belonging to the technical field of energy storage devices. It includes: a housing with a receiving cavity; a cooling medium, the housing further including an inlet and an outlet, the inlet suitable for introducing the cooling medium and the outlet suitable for discharging the cooling medium; and a battery module, with the cooling medium in direct contact with the battery module. The receiving cavity is designed to accommodate the battery module and the cooling medium. The receiving cavity is filled with the cooling medium, and the battery module is immersed in the cooling medium, achieving cooling of the battery module. The housing can also serve as a carrier for the cooling medium, which can enter the receiving cavity from the outside through the inlet and flow out of the receiving cavity through the outlet, achieving circulation of the cooling medium. This medium flows through the battery module to carry away its heat. Because the cooling medium and the battery module are in direct contact, and the battery module is enclosed by the cooling medium, the heat dissipation area is increased, thus improving heat dissipation efficiency.

Description

Technical Field

[0001] This application belongs to the field of energy storage device technology, and specifically relates to an energy storage device.

[0002] Backhand technique

[0003] With the development of lithium battery energy storage technology, battery safety is a key factor restricting the development of the industry, and the cost of energy storage is also a key indicator.

[0004] Currently, liquid cooling plates are generally placed at the bottom of the battery module to cool and dissipate heat.

[0005] However, using liquid cooling plates for heat dissipation has low efficiency, which is not conducive to the heat dissipation of the battery module and poses a safety hazard. Summary of the Invention

[0006] The purpose of this application is to provide an energy storage device that can solve the problem of low heat dissipation efficiency in existing energy storage devices.

[0007] To solve the above-mentioned technical problems, this application proposes an energy storage device, comprising: a housing having a receiving cavity; a cooling medium, the housing further comprising an inlet and an outlet, the inlet being adapted to introduce the cooling medium and the outlet being adapted to discharge the cooling medium; and a battery module, wherein the cooling medium is in direct contact with the battery module.

[0008] In this embodiment, the receiving cavity is designed to house the battery module and the cooling medium. In practical applications, the receiving cavity is filled with the cooling medium, and the battery module is immersed in the cooling medium, which cools the battery module. Furthermore, the cooling medium within the receiving cavity can be in a continuous circulation state. Specifically, the housing can also serve as a carrier for the cooling medium. The cooling medium can enter the receiving cavity from the outside through the inlet and flow out of the receiving cavity through the outlet, achieving circulation of the cooling medium. It flows through the battery module to carry away the heat from the battery module, thereby removing heat from the battery module. In this embodiment, because the cooling medium and the battery module are in direct contact, and the battery module is enclosed by the cooling medium, the heat dissipation area is increased, thus achieving the beneficial effect of improved heat dissipation efficiency.

[0009] Optionally, in this embodiment of the application, the battery module includes: a plurality of battery cells, and a first flow channel is provided between the large surfaces of two adjacent battery cells, the first flow channel being adapted to cool the plurality of battery cells by passing through the cooling medium.

[0010] Optionally, in this embodiment of the application, the first flow channel is provided between the large surfaces of any two opposing battery cells.

[0011] Optionally, in this embodiment of the application, a plurality of the battery cells are arranged along a first direction, and the first flow channel is formed between the large surfaces of at least two of the battery cells that are arranged opposite to each other; wherein, the first direction is the thickness direction of the battery cells.

[0012] Optionally, in this embodiment of the application, a plurality of battery cells are arranged in an array along the first direction and the second direction. The plurality of battery cells arranged along the first direction form a battery cell group, and the plurality of battery cells arranged along the second direction form a battery cell column. The large faces of the battery cells in two adjacent columns of the battery cell column are arranged opposite each other. The second direction is the length direction of the battery cell.

[0013] Optionally, in an embodiment of this application, a second flow channel is provided between two adjacent groups of the battery cells.

[0014] Optionally, in this embodiment of the application, the first flow channel and the second flow channel are interconnected.

[0015] Optionally, in this embodiment, the energy storage device includes: a cooling module connected to the Sohu liquid inlet, the cooling module extending along a third direction, the cooling module discharging a cooling medium to the battery module along a first direction and / or a second direction, the cooling medium flowing within the battery module along the first direction and / or the second direction; wherein, the third direction is the height direction of the battery cell.

[0016] Optionally, in an embodiment of this application, the cooling module includes at least one cooling element extending along the third direction. The cooling element includes a main pipe and at least one branch pipe, which are connected. The cooling medium can be sprayed onto the battery cell through the branch pipe.

[0017] Optionally, in this embodiment, the main pipe is connected to the bottom of the housing, and the main pipe and the housing are in communication, and the cooling medium can circulate in the branch pipe, the main pipe and the housing.

[0018] Optionally, in this embodiment of the application, two adjacent branch pipes are spaced apart along the first direction or the second direction.

[0019] Optionally, in this embodiment of the application, the branch pipe has multiple liquid distribution ports, which are located on the side of the branch pipe facing the battery module, and the multiple liquid distribution ports are spaced apart along the third direction.

[0020] Optionally, in the embodiments of this application, each of the liquid dispensing ports is provided corresponding to the first flow channel or the second flow channel, and the liquid dispensing port can spray cooling medium into the first flow channel or the second flow channel.

[0021] Optionally, in this embodiment of the application, the housing includes a bottom shell, which is disposed at the bottom of the battery module and is connected to the cooling module.

[0022] Optionally, in this embodiment of the application, the bottom shell is provided with a liquid outlet and at least one liquid inlet, and the liquid inlet is connected to the cooling component;

[0023] The cooling medium flows through the inlet, the main pipe, the branch pipe, the outlet, the second flow channel, the first flow channel, and the outlet.

[0024] Optionally, in this embodiment of the application, the box body further includes multiple side plates, all of which are fixedly connected to the bottom shell, and the multiple side plates are sealed end to end, with the side plates and the bottom shell forming the receiving cavity.

[0025] Optionally, in this embodiment, the height of the side plate along the third direction is greater than or equal to the height of the battery module along the third direction.

[0026] Optionally, in this embodiment of the application, the housing further includes a top plate, the top plate and the bottom shell are disposed opposite to each other along the third direction, and the top plate and the plurality of side plates are sealed together.

[0027] Optionally, in this embodiment of the application, the battery module further includes a liquid guiding component, which is disposed at the end of the battery cell away from the bottom shell, and the liquid guiding component is connected to the side of the battery cell near the cooling component, and the liquid guiding component extends in the third direction away from the bottom shell.

[0028] Optionally, in an embodiment of this application, the battery cell includes a sidewall connected to the large surface of the battery cell, and the liquid guiding component has a preset angle with the sidewall, the preset angle being less than 90°.

[0029] Optionally, in this embodiment of the application, the number of cooling elements is two, and the two cooling elements are arranged opposite each other along the first direction or the second direction. Attached Figure Description

[0030] Figure 1 This is an exploded structural diagram of the energy storage device in the embodiments of this application;

[0031] Figure 2 This is a schematic diagram of the connection structure between the bottom shell and the cooling module in an embodiment of this application;

[0032] Figure 3 This is a schematic cross-sectional view of the energy storage device in an embodiment of this application;

[0033] Figure 4This is a cross-sectional structural schematic diagram of an energy storage device including a cooling element in an embodiment of this application;

[0034] Figure 5 This is a cross-sectional structural diagram of an energy storage device including two cooling elements in an embodiment of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 10. Housing; 11. Receiving cavity; 12. Bottom shell; 121. Liquid inlet; 122. Liquid outlet; 13. Side plate; 14. Top plate; 20. Battery module; 21. Battery cell; 22. First flow channel; 23. Second flow channel; 24. Liquid guide; 30. Cooling module; 31. Cooling component; 311. Main pipe; 312. Branch pipe; 3121. Liquid distribution port; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0039] The energy storage device provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0040] See Figures 1 to 5 The embodiments of this application provide an energy storage device, including: a housing 10 having a receiving cavity 11; a cooling medium, the housing 10 further including an inlet 121 and an outlet 122, the inlet 121 being adapted to introduce the cooling medium and the outlet 122 being adapted to discharge the cooling medium; and a battery module 20, the cooling medium being in direct contact with the battery module 20.

[0041] In this embodiment, the receiving cavity 11 is provided to accommodate the battery module 20 and the cooling medium. In practical applications, the receiving cavity 11 is filled with the cooling medium and the battery module 20 is immersed in the cooling medium, which cools the battery module 20. Furthermore, the cooling medium in the receiving cavity 11 can be in a continuous circulation state. Specifically, the housing 10 can also serve as a carrier for the cooling medium. The cooling medium can enter the receiving cavity 11 from the outside through the inlet 121 and flow out of the receiving cavity 11 through the outlet 122, realizing the circulation of the cooling medium. It flows through the battery module 20 to remove the heat from the battery module 20. In this embodiment, since the cooling medium and the battery module 20 are in direct contact and the battery module 20 is wrapped by the cooling medium, the heat dissipation area is increased, thereby improving the heat dissipation efficiency.

[0042] It should be noted that the battery module can be a battery module, a battery cluster, or multiple cells 21 arranged in sequence. This embodiment does not limit this.

[0043] Optionally, in this embodiment of the application, the battery module 20 includes: a plurality of battery cells 21, and a first flow channel 22 is provided between the large surfaces of at least two battery cells 21 that are arranged opposite to each other. The first flow channel 22 is adapted to cool the plurality of battery cells 21 by passing a cooling medium.

[0044] In this embodiment of the application, the surface with the largest area on the outer surface of the battery cell 21 is called the large surface. It can be understood that placing the first flow channel 22 between the large surfaces can increase the contact area between the cooling medium and the battery cell 21, thereby having the beneficial effect of expanding the heat dissipation area and improving the heat dissipation efficiency.

[0045] Optionally, in the embodiments of this application, a first flow channel is provided between the large surfaces of any two battery cells 21 that are arranged opposite to each other.

[0046] In this embodiment, a first flow channel is provided between any two battery cells 21 with their large surfaces facing each other. That is, as long as the two battery cells 21 in the battery module 20 are arranged with their large surfaces facing each other, the conditions for the passage of the cooling medium can be met. The above arrangement has the beneficial effect of improving the cooling efficiency of the battery module.

[0047] Optionally, in this embodiment of the application, a plurality of battery cells 21 are arranged along a first direction X, and a first flow channel 22 is formed between the large surfaces of at least two battery cells 21 that are arranged opposite to each other; wherein, the first direction X is the thickness direction of the battery cell 21.

[0048] In this embodiment of the application, a plurality of cells 21 in the battery module 20 are arranged along the thickness direction of the cells 21. A first flow channel 22 is provided on the large surface between two adjacent cells 21. The cooling medium can flow between the first flow channels 22 and directly contact the large surface of the cells 21, which has the beneficial effect of expanding the heat dissipation area and improving the heat dissipation efficiency.

[0049] Optionally, in this embodiment of the application, a plurality of battery cells 21 are arranged in an array along a first direction X and a second direction Y. The plurality of battery cells 21 arranged along the first direction X form a battery cell 21 group, and the plurality of battery cells 21 arranged along the second direction Y form a battery cell 21 column. The large surfaces of the battery cells 21 in two adjacent columns of battery cells 21 are arranged opposite each other. The second direction Y is the length direction of the battery cell 21.

[0050] In this embodiment of the application, a plurality of cells 21 in the battery module 20 are arranged along the thickness direction and the length direction of the cells 21, and the large surfaces of two adjacent cells 21 along the first direction X are arranged opposite each other. Furthermore, a first flow channel 22 is provided, in which the cooling medium can flow, which has the beneficial effect of expanding the heat dissipation area and improving the heat dissipation efficiency.

[0051] Optionally, in this embodiment of the application, a second flow channel 23 is provided between two adjacent groups of cells 21.

[0052] In this application, a second flow channel 23 is provided between two adjacent groups of battery cells 21. The cooling medium can flow in the second flow channel 23. The provision of the second flow channel 23 increases the contact area between the cooling medium and the battery cell 21. While cooling the large surface of the battery cell 21, it also further increases the cooling surface of the battery cell 21, which has the beneficial effect of expanding the heat dissipation area of ​​the battery cell 21 and improving the heat dissipation efficiency.

[0053] Optionally, in this embodiment of the application, the first flow channel 22 and the second flow channel 23 are interconnected.

[0054] In this embodiment, the interconnected first flow channel 22 and second flow channel 23 can further realize the heat exchange of the cooling medium in the receiving cavity 11, which has the beneficial effect of realizing the temperature balance of the cooling medium in the receiving cavity 11 and further cooling the battery cell 21.

[0055] Optionally, in this embodiment, the energy storage device includes: a cooling module 30, which is connected to the Sohu liquid inlet 121. The cooling module 30 extends along a third direction Z and discharges a cooling medium to the battery module 20 along a first direction X and / or a second direction Y. The cooling medium can flow within the battery module 20 along the first direction X and / or the second direction Y. The third direction Z is the height direction of the energy storage device of the cell 21.

[0056] In this embodiment, the cooling module 30 extends along the height direction of the cell 21, and the cooling module 30 sprays cooling medium onto the battery module 20 along the width direction or length direction of the cell 21. In practical applications, the cooling medium sprayed along the first direction X, or the second direction Y, or both the first direction X and the second direction Y, extends a certain height or width. The cooling medium can enter the battery module 20 and cool it. Under the action of gravity, the cooling medium will also flow along the third direction Z towards the bottom of the battery module 20, cooling it again. In this embodiment, the cooling medium flowing along the first direction X or the second direction Y can cool the battery module 20 in two directions, increasing the cooling area of ​​the battery module 20 and improving its heat dissipation efficiency.

[0057] It should be noted that the cooling module 30 can be externally pressurized to spray the cooling medium into the battery module 20. The bottom of the housing 10 can be externally connected to a suction device to extract the cooling system from the receiving cavity 11. These arrangements have the beneficial effect of promoting the flow of the cooling medium in the receiving cavity 11 in the desired direction.

[0058] Optionally, in this embodiment of the application, the cooling module 30 includes at least one cooling element 31, which extends in the third direction Z. The cooling element 31 includes a main pipe 311 and at least one branch pipe 312, which are connected. The cooling medium can be sprayed from the branch pipe 312 onto the battery cell 21.

[0059] Furthermore, the main pipe 311 is connected to the bottom of the housing 10, and the main pipe 311 and the housing 10 are in communication, so that the cooling medium can circulate within the branch pipe 312, the main pipe 311 and the housing 10.

[0060] Furthermore, two adjacent branch pipes 312 are spaced apart along the first direction X or the second direction Y.

[0061] In this embodiment, the cooling element 31 is configured to spray cooling medium onto the battery module 20, allowing the cooling medium to enter the second flow channel 23. The main pipe 311 is configured to connect to the bottom of the housing 10 to achieve circulating flow of the cooling medium between the housing 10 and the cooling module 30. The branch pipes 312 are configured to spray cooling medium onto the battery module 20. Further, multiple branch pipes 312 can be spaced apart along the second direction Y or the third direction Z, and the branch pipes 312 are corresponding to the rows of battery cells 21. It can be understood that the branch pipes 312 can spray cooling medium onto the battery cells 21. Specifically, the branch pipes 312 can spray cooling medium onto the battery module 20 along the first direction X. Setting the branch pipes 312 to correspond to the rows of battery cells 21 can ensure that cooling medium is sprayed onto each row of battery cells 21 as much as possible, avoiding any rows of battery cells 21 that are not sprayed with cooling medium, which has the beneficial effect of improving the cooling efficiency of the battery module 20.

[0062] Optionally, in this embodiment of the application, the branch pipe 312 is provided with a plurality of liquid distribution ports 3121, which are located on the side of the branch pipe 312 facing the battery module 20, and the plurality of liquid distribution ports 3121 are arranged at intervals along the third direction Z.

[0063] Furthermore, each of the liquid distribution ports 3121 is provided corresponding to the first flow channel 22 or the second flow channel 23, and the liquid distribution port 3121 can spray cooling medium into the first flow channel 22 or the second flow channel 23.

[0064] In this embodiment of the application, a plurality of liquid outlets 3121 are spaced apart along the first direction X. The above arrangement is used to spray cooling medium into the gap (i.e., the first flow channel 22 or the second flow channel 23) formed between adjacent battery packs along the first direction X or the second direction Y, so as to cool the first flow channel 22 or the second flow channel 23. The spaced liquid outlets 3121 can equalize the temperature in the energy storage device, which has the beneficial effect of making the temperature of the battery module 20 as uniform as possible.

[0065] Optionally, in this embodiment of the application, the housing 10 includes a bottom shell 12, which is disposed at the bottom of the battery module 20 and is connected to the cooling module 30.

[0066] Furthermore, the bottom shell 12 is provided with a liquid outlet 122 and at least one liquid inlet 121, and the liquid inlet 121 is connected to the cooling component 31; the cooling medium flows through the liquid inlet 121, the main pipe 311, the branch pipe 312, the liquid outlet 122, the second flow channel 23, the first flow channel 22 and the liquid outlet 122.

[0067] In this embodiment, the bottom shell 12 is configured to circulate the cooling medium. Specifically, the bottom shell 12 is connected to the cooling module 30, and the bottom shell 12 has an outlet 122 and an inlet 121. The inlet 121 is connected to the cooling component 31. In practical applications, the cooling medium in the accommodating cavity 11 can flow sequentially through the inlet 121, the main pipe 311, the branch pipe 312, the outlet 122, the second flow channel 23, the first flow channel 22, and the outlet 122, forming a cooling medium circulation within the energy storage device to continuously cool the battery module 20, achieving temperature balance throughout the battery module 20 and improving the safety of the battery module 20.

[0068] It should be noted that the liquid inlet 121 and the cooling element 31 are set in a one-to-one correspondence. One liquid inlet 121 can be connected to one cooling element 31. When there are multiple cooling elements 31, the bottom shell 12 can have multiple liquid inlets 121.

[0069] Optionally, in this embodiment of the application, the housing 10 further includes a plurality of side plates 13, all of which are fixedly connected to the bottom shell 12 and are sealed end to end, with the side plates 13 and the bottom shell 12 forming a receiving cavity 11.

[0070] Furthermore, the height of the side plate 13 along the third direction Z is greater than or equal to the height of the battery module 20 along the third direction Z.

[0071] In this embodiment, the side plate 13 is configured to, together with the bottom shell 12, enclose a receiving cavity 11. Specifically, since the receiving cavity 11 needs to hold a cooling medium, the bottom shell 12 and the side plate 13 are sealed together to prevent leakage of the cooling medium. Furthermore, since the battery module 20 needs to be completely submerged in the cooling medium, the height of the side plate 13 along the first direction X needs to be at least equal to the height of the battery module 20. Generally, the height of the side plate 13 along the first direction X is slightly greater than the height of the battery module 20, so that the cooling medium contained in the receiving cavity 11 can effectively cool the battery module 20. This configuration provides the beneficial effects of achieving enclosed cooling of the battery module 20, further equalizing the temperature of the battery module 20, and improving the safety of the battery module 20 in use.

[0072] Furthermore, the multiple side plates 13 can be enclosed to form a polygonal structure or a columnar structure; this embodiment does not impose any limitations on this.

[0073] Optionally, in this embodiment of the application, the housing 10 further includes a top plate 14, the top plate 14 and the bottom shell 12 are arranged opposite each other along the third direction Z, and the top plate 14 and a plurality of side plates 13 are sealed together.

[0074] In this embodiment, the top plate 14 is used to seal the receiving cavity 11 to prevent external substances from entering the receiving cavity 11. Specifically, the top plate 14 and the bottom shell 12 are arranged opposite to each other along the first direction X, and the top plate 14 and multiple side plates 13 are all sealed together to provide a relatively sealed and stable environment for the cooling medium, battery module 20 and cooling module 30 in the receiving cavity 11, which has the beneficial effect of improving the stability and safety of the energy storage device.

[0075] Optionally, in this embodiment of the application, the battery module 20 further includes a liquid guide 24, which is disposed at the end of the cell 21 away from the bottom shell 12 and is connected to the side of the cell 21 near the cooling element 31. The liquid guide 24 extends along the third direction Z to the end away from the bottom shell 12.

[0076] In this embodiment, the liquid guide 24 is configured to guide the cooling medium ejected from the branch pipe 312, so that the cooling medium flowing through the second flow channel 23 flows back through the first flow channel 22. Specifically, the liquid guide 24 is disposed at the end of the battery cell 21 away from the bottom shell 12, and the liquid guide 24 is connected to the side of the battery cell 21 near the cooling element 31. In practical applications, when the cooling element 31 ejects cooling medium into the second flow channel 23, some of the cooling medium will be blocked when it comes into contact with the liquid guide 24. At the same time, the cooling medium is also affected by gravity and the suction force of the outlet 122, and will flow downward along the first flow channel 22. In addition, the liquid guide 24 also has a certain height along the first direction X to achieve the blocking effect on the cooling medium. In this embodiment, the liquid guide 24 has the beneficial effect of facilitating the flow of a sufficient amount of cooling medium into the first flow channel 22.

[0077] Optionally, in this embodiment of the application, the battery cell 21 includes a sidewall, which is connected to the large surface of the battery cell 21, and the liquid guide 24 has a preset angle with the sidewall, which is less than 90°.

[0078] In this embodiment, the sidewall of the battery cell 21 is connected to the large surface of the battery cell 21. In practical applications, the battery cell 21 may include two large surfaces and two sidewalls, which alternate and are connected end to end. It can be understood that the liquid guide 24 is disposed at one end of the battery cell 21, and the angle between it and the sidewall is an acute angle. That is, after the cooling medium is sprayed out from the liquid outlet 3121, it first enters the acute angle space formed by the liquid guide 24 and the end of the battery cell 21. The cooling medium entering the acute angle space is affected by gravity and the suction of the liquid outlet 122, and will flow downward along the first flow channel 22. The setting of the acute angle has the beneficial effect of facilitating the flow of a sufficient amount of cooling medium to the first flow channel 22.

[0079] Optionally, in this embodiment, the number of cooling elements 31 is two, and the two cooling elements 31 are arranged opposite each other along the first direction X or the second direction Y.

[0080] In this embodiment, the two cooling elements are arranged opposite each other along the second direction Y or the third direction Z. The arrangement of the two cooling elements 31 increases the length of the spray path of the cooling elements 31 along the second direction Y or the third direction Z, which can realize that the cooling medium flows through a longer second flow channel 23, thereby having the beneficial effect of improving the cooling efficiency of the battery module 20.

[0081] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0082] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An energy storage device, characterized in that, include: The housing (10) has a receiving cavity (11); The cooling medium, the housing (10) further includes an inlet and an outlet, the inlet being adapted to introduce the cooling medium, and the outlet being adapted to discharge the cooling medium; and The battery module (20) is in direct contact with the cooling medium.

2. The energy storage device according to claim 1, characterized in that, The battery module includes: A plurality of battery cells (21), wherein at least two of the battery cells (21) are provided with a first flow channel between their oppositely arranged large surfaces, the first flow channel being adapted to allow the cooling medium to pass through to cool the plurality of battery cells (21).

3. The energy storage device according to claim 2, characterized in that, The first flow channel is provided between the large surfaces of any two cells (21) that are arranged opposite each other.

4. The energy storage device according to claim 2, characterized in that, The plurality of said cells (21) are arranged along a first direction (X), and the first flow channel is formed between the large surfaces of at least two said cells (21) that are arranged opposite to each other; Wherein, the first direction (X) is the thickness direction of the battery cell (21).

5. The energy storage device according to claim 2, characterized in that, Multiple battery cells are arranged in an array along the first direction (X) and the second direction (Y). The multiple battery cells (21) arranged along the first direction (X) form a battery cell group, and the multiple battery cells (21) arranged along the second direction (Y) form a battery cell column. The large surfaces of the battery cells (21) in two adjacent battery cell columns are arranged opposite each other. Wherein, the second direction (Y) is the length direction of the battery cell (21).

6. The energy storage device according to claim 5, characterized in that, A second flow channel (23) is provided between two adjacent groups of the battery cells.

7. The energy storage device according to claim 6, characterized in that, The first flow channel (22) and the second flow channel (23) are interconnected.

8. The energy storage device according to any one of claims 2 to 7, characterized in that, The energy storage device includes: A cooling module (30) is connected to the liquid inlet and extends along a third direction (Z). The cooling module (30) discharges the cooling medium to the battery module (20) along a first direction (X) and / or a second direction (Y). The cooling medium can flow within the battery module (20) along the first direction (X) and / or the second direction (Y). Wherein, the third direction (Z) is the height direction of the battery cell (21).

9. The energy storage device according to claim 8, characterized in that, The cooling module (30) includes at least one cooling element (31) extending along the third direction (Z). The cooling element (31) includes a main pipe (311) and at least one branch pipe (312), which are connected. The cooling medium can be sprayed from the branch pipe (312) onto the battery cell (21).

10. The energy storage device according to claim 9, characterized in that, The main pipe (311) is connected to the bottom of the housing (10), and the main pipe (311) and the housing (10) are in communication. The cooling medium can circulate within the branch pipe (312), the main pipe (311) and the housing (10).

11. The energy storage device according to claim 9, characterized in that, Two adjacent branch pipes (312) are spaced apart along the first direction (X) or the second direction (Y).

12. The energy storage device according to claim 11, characterized in that, The branch pipe (312) has multiple liquid outlets (3121), which are located on the side of the branch pipe (312) facing the battery module (20). The multiple liquid outlets (3121) are spaced apart along the third direction (Z).

13. The energy storage device according to claim 12, characterized in that, Each of the liquid dispensing ports (3121) is provided corresponding to the first flow channel (22) or the second flow channel (23), and the liquid dispensing ports (3121) can spray the cooling medium into the first flow channel (22) or the second flow channel (23).

14. The energy storage device according to claim 9, characterized in that, The housing (10) includes a bottom shell (12), which is disposed at the bottom of the battery module (20) and is connected to the cooling module (30).

15. The energy storage device according to claim 14, characterized in that, The bottom shell (12) is provided with a liquid outlet (122) and at least one liquid inlet (121), and the liquid inlet (121) is connected to the cooling component (31); The cooling medium flows through the inlet (121), the main pipe (311), the branch pipe (312), the outlet (122), the second flow channel (23), the first flow channel (22), and the outlet (122).

16. The energy storage device according to claim 14, characterized in that, The housing (10) also includes multiple side plates (13), which are fixedly connected to the bottom shell (12) and are sealed end to end. The side plates (13) and the bottom shell (12) together form the receiving cavity (11).

17. The energy storage device according to claim 16, characterized in that, The height of the side plate (13) along the third direction (Z) is greater than or equal to the height of the battery module (20) along the third direction (Z).

18. The energy storage device according to claim 16, characterized in that, The housing (10) also includes a top plate (14), the top plate (14) and the bottom shell (12) are arranged opposite each other along the third direction (Z), and the top plate (14) and the plurality of side plates (13) are sealed together.

19. The energy storage device according to claim 14, characterized in that, The battery module (20) further includes a liquid guide (24), which is disposed at one end of the cell (21) away from the bottom shell (12) and is connected to the side of the cell (21) near the cooling element (31). The liquid guide (24) extends along the third direction (Z) away from the bottom shell (12).

20. The energy storage device according to claim 19, characterized in that, The battery cell (21) includes a sidewall connected to the large surface of the battery cell (21), and the liquid guide (24) has a preset angle with the sidewall, the preset angle being less than 90°.

21. The energy storage device according to claim 9, characterized in that, The number of cooling elements (31) is two, and the two cooling elements (31) are arranged opposite each other along the first direction (X) or the second direction (Y).

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