Energy storage device

Abstract

The embodiment of the invention provides an energy storage device which comprises a shell, a plurality of battery modules, a flow guide part and a fan, and the shell is provided with an air inlet and an air outlet; the plurality of battery modules are arranged in the shell and are arranged along a first direction; the first heat dissipation channels are located between the adjacent battery modules, and the air inlets and the air outlets are communicated through the first heat dissipation channels; the flow guide part is arranged in the shell and comprises a base plate and a side part connected to the base plate, the side part is located on the side, facing the battery module, of the base plate, the base plate is provided with an opening, the base plate and the battery module are arranged in a spaced mode in the second direction, and the first direction is perpendicular to the second direction; the first fan is partially located at the opening; the second fan is partially located at the opening; the third fan is partially located at the opening; the operation output power of the second fan is larger than that of the first fan, and the operation output power of the second fan is larger than that of the third fan.

Description

Technical Field

[0001] The present application belongs to the field of energy storage technology, and in particular, relates to an energy storage device. Background Art

[0002] The energy storage device is used to provide electrical energy to electrical devices. The energy storage device generally includes a housing and a plurality of battery modules disposed inside the housing.

[0003] In order to improve the energy storage capacity of energy storage devices, the number of battery modules has gradually increased and the size of battery modules has been designed to be larger and larger, and the heat generated during operation has increased. Therefore, how to effectively improve the heat dissipation capacity of energy storage devices to improve their safety has always been a research direction in the industry. Summary of the invention

[0004] An embodiment of the present invention provides an energy storage device, which can improve its safety.

[0005] An embodiment of the present invention provides an energy storage device, comprising a housing, a plurality of battery modules, a first heat dissipation channel, a second heat dissipation channel, a third heat dissipation channel, a first fan, a second fan and a third fan; the housing is provided with an air inlet and an air outlet; a plurality of battery modules are arranged in the housing and arranged along a first direction; the first heat dissipation channel is located between adjacent battery modules, or between the battery module and the housing; the first heat dissipation channel connects the air inlet and the air outlet; the second heat dissipation channel is located between adjacent battery modules; the second heat dissipation channel connects the air inlet and the air outlet; the third heat dissipation channel is located between adjacent battery modules , or located between the battery module and the shell; the third heat dissipation channel connects the air inlet and the air outlet; along the first direction, the second heat dissipation channel is located between the first heat dissipation channel and the third heat dissipation channel; the first fan is configured to allow the refrigerant to pass through the air inlet, the first heat dissipation channel and the air outlet; the second fan is configured to allow the refrigerant to pass through the air inlet, the second heat dissipation channel and the air outlet; the third fan is configured to allow the refrigerant to pass through the air inlet, the third heat dissipation channel and the air outlet; the operating output power of the second fan is greater than the operating output power of the first fan, and the operating output power of the second fan is greater than the operating output power of the third fan.

[0006] In the above embodiments, the air inlet and the air outlet are spaced apart along a second direction, and the second direction is perpendicular to the first direction; the energy storage device includes a first isolation portion and a second isolation portion, and along the second direction, the first isolation portion is located between the air inlet and the battery module, and the second isolation portion is located between the air inlet and the battery module; at least part of the projection of the second heat dissipation channel along the second direction is located between the projection of the first isolation portion along the second direction and the projection of the second isolation portion along the second direction.

[0007] In one or more of the above optional embodiments, the energy storage device includes a guide member arranged in the outer shell, the guide member includes a substrate, the substrate is provided with an opening, the opening connects the air inlet and the first heat dissipation channel, connects the air inlet and the second heat dissipation channel, connects the air inlet and the third heat dissipation channel, along the second direction, the substrate and the battery module are spaced apart; the first isolation portion is connected to the substrate and is located between the substrate and the battery module; the second isolation portion is connected to the substrate and is located between the substrate and the battery module.

[0008] In one or more optional embodiments above, the guide member includes a side portion connected to the substrate, the side portion is arranged around the substrate, the substrate and the side portion form a recess, and the recess faces the first heat dissipation channel, the second heat dissipation channel and the third heat dissipation channel.

[0009] In one or more of the above optional embodiments, the first isolating portion and the second isolating portion separate the recessed portion into a first chamber, a second chamber and a third chamber; the openings include a first opening, a second opening and a third opening, the first opening is connected to the first chamber, the second opening is connected to the second chamber, and the third opening is connected to the third chamber; the first fan is configured to allow the refrigerant to pass through the air inlet, the first opening, the first chamber, the first heat dissipation channel and the air outlet; the second fan is configured to allow the refrigerant to pass through the air inlet, the second opening, the second chamber, the second heat dissipation channel and the air outlet; the third fan is configured to allow the refrigerant to pass through the air inlet, the third opening, the third chamber, the third heat dissipation channel and the air outlet.

[0010] In one or more of the above optional embodiments, the first fan includes a first blade, which is located in the first chamber; the second fan includes a second blade, which is located in the second chamber; the third fan includes a third blade, which is located in the third chamber.

[0011] In one or more of the above optional embodiments, the side portion and the battery module are sealed and connected.

[0012] In one or more of the above optional embodiments, the guide member includes an extension portion, which is connected to the side portion; a seal is provided between the extension portion and the battery module, and the seal connects the extension portion and the battery module.

[0013] In one or more optional embodiments above, there is a gap between the side portion and the battery module along the second direction, and the gap is less than 5 mm.

[0014] In one or more of the above optional embodiments, the side portion includes a first wall, a second wall, a third wall and a fourth wall connected to each other, the first wall and the third wall are opposite to each other along a first direction, and the second wall and the fourth wall are opposite to each other along a third direction; the first wall, the second wall, the third wall and the fourth wall are connected to the battery module; the first direction, the second direction and the third direction are perpendicular to each other.

[0015] In one or more of the above optional embodiments, the housing includes a bottom wall and a top wall arranged opposite to each other along a first direction, a third heat dissipation channel is provided between the battery module and the top wall, and / or a first heat dissipation channel is provided between the battery module and the bottom wall.

[0016] In one or more of the above optional embodiments, the side portion is sealed and connected to the top wall, the battery module and the bottom wall.

[0017] In one or more optional embodiments above, the guide member includes an extension portion connected to the side portion; the energy storage device includes a seal member connecting the extension portion to the battery module, the extension portion to the top wall, and the extension portion to the bottom wall.

[0018] In one or more optional embodiments above, along the second direction, there is a gap between the side and the battery module, and the gap is less than 5 mm; and / or, along the second direction, there is a gap between the side and the top wall, and the gap is less than 5 mm; and / or, along the second direction, there is a gap between the side and the bottom wall, and the gap is less than 5 mm.

[0019] In one or more of the above optional embodiments, the side portion includes a first wall, a second wall, a third wall and a fourth wall connected to each other, the first wall and the third wall are opposite to each other along a first direction, and the second wall and the fourth wall are opposite to each other along a third direction; the first wall is connected to the top wall, the third wall is connected to the bottom wall, and the second wall and the fourth wall are connected to the battery module; the first direction, the second direction and the third direction are perpendicular to each other.

[0020] In one or more of the above optional embodiments, the housing includes a front wall and a rear wall arranged opposite to each other along the second direction; the front wall is arranged opposite to the guide member, and the air inlet is arranged on the front wall; the first fan, the second fan and the third fan are fixed to the guide member, and the first fan, the second fan and the third fan are arranged opposite to the air inlet; the air outlet is arranged on the rear wall.

[0021] In one or more of the above optional embodiments, the battery module has a pressure relief portion, which faces the rear wall and is arranged opposite to the air outlet.

[0022] In one or more of the above optional embodiments, the battery module has a first protrusion and a second protrusion arranged at intervals along a third direction, and the first protrusion and the second protrusion are located in the first heat dissipation channel; the projection of the first protrusion along the second direction and the projection of the second protrusion along the second direction are located on both sides of the projection of the guide member along the second direction.

[0023] In one or more of the above optional embodiments, among the adjacently arranged battery modules, the first protrusion and the second protrusion of one battery module are connected to another battery module.

[0024] In one or more of the above optional embodiments, along the first direction, the length of the first heat dissipation channel is 5 mm to 20 mm.

[0025] In one or more optional embodiments above, the battery module includes a shell and a plurality of battery cells: the plurality of battery cells are arranged inside the shell, and the battery cells are arranged at intervals along the third direction.

[0026] In one or more of the above optional embodiments, the energy storage device further includes an electrical module, which is disposed outside the housing and is electrically connected to the battery module.

[0027] The energy storage device of the embodiment of the present invention can provide a first heat dissipation channel, a second heat dissipation channel and a third heat dissipation channel to allow a refrigerant to enter between adjacent battery modules and / or between the battery module and the shell to cool the battery module. At the same time, the flow rate of the refrigerant in the first heat dissipation channel, the second heat dissipation channel and the third heat dissipation channel can be increased by providing a first fan, a second fan and a third fan, thereby improving the cooling effect on the battery module and improving the safety of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings.

[0029] Figure 1 A schematic diagram of the structure of an energy storage device provided in some embodiments of the present application;

[0030] Figure 2 Another structural schematic diagram of an energy storage device provided in some embodiments of the present application;

[0031] Figure 3 An exploded diagram of an energy storage device provided in some embodiments of the present application;

[0032] Figure 4 A schematic diagram of the structure of a flow guide member of an energy storage device provided in some embodiments of the present application;

[0033] Figure 5 Another exploded diagram of an energy storage device provided in some embodiments of the present application;

[0034] Figure 6 Another structural schematic diagram of the flow guide member of the energy storage device provided in some embodiments of the present application;

[0035] Figure 7 Another structural schematic diagram of an energy storage device provided in some embodiments of the present application;

[0036] Figure 8A schematic diagram of the structure of a battery module of an energy storage device provided in some embodiments of the present application;

[0037] Fig. 9 A layout diagram of a battery module of an energy storage device provided in some embodiments of the present application;

[0038] Fig.10 A schematic diagram of the internal structure of a battery module of an energy storage device provided in some embodiments of the present application.

[0039] Description of Figure Numbers:

[0040] 1. housing; 11. front wall; 111. air inlet; 12. rear wall; 121. air outlet; 13. top wall; 14. bottom wall;

[0041] 2. Battery module; 2a. Battery module; 2b. Battery module; 21. Battery cell; 22. Housing; 23. Pressure relief portion; 24. First convex portion; 25. Second convex portion;

[0042] 31. First heat dissipation channel; 32. Second heat dissipation channel; 33. Third heat dissipation channel;

[0043] 4. guide member; 41. substrate; 411. opening; 411a. first opening; 411b. second opening; 411c. third opening; 42. side portion; 421. first wall; 422. second wall; 423. third wall; 424. fourth wall; 43. extension portion; 431. first extension portion; 432. second extension portion; 433. third extension portion; 434. fourth extension portion; 44. recess; 441. first chamber; 442. second chamber; 443. third chamber;

[0044] A, first isolation part; B, second isolation part;

[0045] 5. Fan; 51. First fan; 52. Second fan; 53. Third fan;

[0046] 6. Electrical module;

[0047] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0048] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention, rather than to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0050] The energy storage device of the present application is described below with reference to the accompanying drawings.

[0051] like Figures 1 to 3 As shown, the present application provides an energy storage device, which includes a housing 1 and a plurality of battery modules 2. The plurality of battery modules 2 are arranged inside the housing 1, and the battery modules 2 are arranged along a first direction X. The housing 1 is provided with an air inlet 111 and an air outlet 121.

[0052] In some embodiments, the energy storage device includes a first heat dissipation channel 31, which is located between adjacent battery modules 2, or between the battery module 2 and the housing 1. The first heat dissipation channel 31 connects the air inlet 111 and the air outlet 121; the refrigerant can enter the first heat dissipation channel 31 from the air inlet 111 and flow out from the air outlet 121 to cool the battery module 2.

[0053] In some embodiments, the energy storage device includes a second heat dissipation channel 32, which is located between adjacent battery modules 2. The second heat dissipation channel 32 connects the air inlet 111 and the air outlet 121; the refrigerant can enter the second heat dissipation channel 32 from the air inlet 111 and flow out from the air outlet 121 to cool the battery module 2.

[0054] In some embodiments, the energy storage device includes a third heat dissipation channel 33, which is located between adjacent battery modules 2, or between the battery module 2 and the housing 1. The third heat dissipation channel 33 connects the air inlet 111 and the air outlet 121; the refrigerant can enter the third heat dissipation channel 33 from the air inlet 111 and flow out from the air outlet 121 to cool the battery module 2.

[0055] Along the first direction X, the second heat dissipation channel 32 is located between the first heat dissipation channel 31 and the third heat dissipation channel 33 .

[0056] In some embodiments, the energy storage device includes a first fan 51 , and the first fan 51 is configured to allow the refrigerant to pass through the air inlet 111 , the first heat dissipation channel, and the air outlet 121 .

[0057] In some embodiments, the energy storage device includes a second fan 52 , and the second fan 52 is configured to allow the refrigerant to pass through the air inlet 111 , the second heat dissipation channel, and the air outlet 121 .

[0058] In some embodiments, the energy storage device includes a third fan 53 , and the third fan 53 is configured to allow the refrigerant to pass through the air inlet 111 , the third heat dissipation channel, and the air outlet 121 .

[0059] In some embodiments, the first fan 51 , the second fan 52 , and the third fan 53 are disposed along the first direction X, and the second fan 52 is located between the first fan 51 and the third fan 53 .

[0060] In some embodiments, the operating output power of the second fan 52 is greater than the operating output power of the first fan 51. The operating output power of the second fan 52 is greater than the operating output power of the third fan 53. The second fan 52 is located between the first fan 51 and the third fan 53, corresponding to the middle position of the battery module 2 along the first direction X, where the heat of the battery module 2 is not easy to dissipate and the temperature is relatively high, so the operating output power of the second fan 52 is greater than the operating output power of the first fan 51, and the operating output power of the second fan 52 is greater than the third fan 53, which can improve the heat dissipation efficiency of each battery module 2 at this location and improve the overall safety of the energy storage device.

[0061] The fan 5 can promote the flow of the refrigerant by supplying air or by sucking air. In the embodiment of the present application, supplying air is used as an example for explanation. The operating output power of the second fan 52 is greater than the operating output power of the first fan 51, and the operating output power of the second fan 52 is greater than the operating output power of the third fan 53. It can be understood that the air supply volume of the second fan 52 is greater than the air supply volume of the first fan 51, and the air supply volume of the second fan 52 is greater than the air supply volume of the third fan 53.

[0062] Optionally, the refrigerant may be cooled air, air at room temperature, or other room temperature or cooling gas other than air.

[0063] In some embodiments, the air inlet 111 and the air outlet 121 are spaced apart along the second direction Y, and the second direction Y is perpendicular to the first direction X. The battery module 2 is disposed between the air inlet 111 and the air outlet 121. The first heat dissipation channel 31, the second heat dissipation channel 32, and the third heat dissipation channel 33 are all connected to the air inlet 111 and the air outlet 121.

[0064] In some embodiments, the energy storage device includes a first isolation portion A and a second isolation portion B. Along the second direction Y, the first isolation portion A is located between the air inlet 111 and the battery module 2, and the second isolation portion B is located between the air inlet 111 and the battery module 2; at least part of the projection of the second heat dissipation channel 32 along the second direction Y is located between the projection of the first isolation portion A along the second direction Y and the projection of the second isolation portion B along the second direction Y. The first isolation portion A isolates the first heat dissipation channel 31 and the second heat dissipation channel 32, reducing the refrigerant driven by the first fan 51 passing through the second heat dissipation channel 32 and the refrigerant of the second fan 52 passing through the first heat dissipation channel 31. The first isolation portion A isolates the second heat dissipation channel 32 and the third heat dissipation channel 33, reducing the refrigerant driven by the second fan 52 passing through the third heat dissipation channel 33 and the refrigerant of the third fan 53 passing through the second heat dissipation channel 32.

[0065] Optionally, the first isolation portion A partially extends into a first heat dissipation channel 31 or a second heat dissipation channel 32 closest to the first heat dissipation channel 31 , and the second isolation portion B partially extends into a third heat dissipation channel 33 or a second heat dissipation channel 32 closest to the third heat dissipation channel 33 .

[0066] In some embodiments, the energy storage device includes a guide member 4, which is disposed in the housing 1. The guide member 4 is located between the battery module 2 and the air inlet 111; the guide member 4 includes a substrate 41, and the substrate 41 is provided with an opening 411, and the opening 411 connects the air inlet 111 with the first heat dissipation channel 31, connects the air inlet 111 with the second heat dissipation channel 32, and connects the air inlet 111 with the third heat dissipation channel 33. Along the second direction Y, the substrate 41 is spaced from the battery module 2, and the refrigerant enters the housing 1 from the air inlet 111 and passes through the opening 411 to reach between the substrate 41 and the battery module 2.

[0067] The first isolating portion A is connected to the substrate 41 and is located between the substrate 41 and the battery module 2. The second isolating portion B is connected to the substrate 41 and is located between the substrate 41 and the battery module 2. The substrate 41 is conducive to guiding the flow of the refrigerant along the second direction Y.

[0068] In some embodiments, the guide member includes a side portion 42 connected to the substrate 41 , the side portion 42 is located on a side of the substrate 41 facing the battery module 2 , and the side portion 42 extends in a direction close to the battery module 2 .

[0069] like Figures 3 to 6 As shown, in some embodiments, the side portion 42 is arranged around the substrate 41, and the substrate 41 and the side portion 42 enclose a recess 44, and the recess 44 faces the first heat dissipation channel 31, the second heat dissipation channel 32, and the third heat dissipation channel 33. By providing the recess 44, the volume of the space for gathering the refrigerant between the guide member 4 and the battery module 2 can be increased, providing space for the gathering of the refrigerant, increasing the refrigerant flow entering the first heat dissipation channel 31, the second heat dissipation channel 32, and the third heat dissipation channel 33, and improving the heat dissipation effect on the battery module 2.

[0070] In some embodiments, the first fan 51 is configured to allow the coolant to pass through the air inlet 111 , the opening 411 , the first heat dissipation channel 31 , and the air outlet 121 to enhance the heat dissipation effect on the battery module 2 .

[0071] In some embodiments, the second fan 52 is configured to allow the coolant to pass through the air inlet 111 , the opening 411 , the second heat dissipation channel 32 , and the air outlet 121 , thereby improving the heat dissipation effect on the battery module 2 .

[0072] In some embodiments, the third fan 53 is configured to allow the coolant to pass through the air inlet 111 , the opening 411 , the third heat dissipation channel 33 and the air outlet 121 , thereby improving the heat dissipation effect on the battery module 2 .

[0073] In some embodiments, there may be only one opening 411 , the first fan 51 is partially located at the opening 411 , the second fan 52 is partially located at the opening 411 , and the third fan 53 is partially located at the opening 411 ; the first fan 51 , the second fan 52 , and the third fan 53 transport refrigerant to the first heat dissipation channel 31 through the opening 411 .

[0074] like Figure 4 and Figure 6 As shown, in some embodiments, the first isolation portion A and the second isolation portion B are both connected to the substrate 41 and are located in the recess 44. The first isolation portion A and the second isolation portion B separate the recess 44 into a first chamber 441, a second chamber 442, and a third chamber 443, and the first chamber 441, the second chamber 442, and the third chamber 443 are arranged along the first direction X.

[0075] like Figures 3 to 6As shown, in some embodiments, the opening 411 includes a first opening 411a, a second opening 411b and a third opening 411c. The first opening 411a is connected to the first chamber 441, the second opening 411b is connected to the second chamber 442, and the third opening 411c is connected to the third chamber 443.

[0076] The first fan 51 is configured to allow the refrigerant to pass through the air inlet 111, the first opening 411a, the first chamber 441, the first heat dissipation channel 31 and the air outlet 121, the second fan 52 is configured to allow the refrigerant to pass through the air inlet 111, the second opening 411b, the second chamber 442, the second heat dissipation channel 32 and the air outlet 121, and the third fan 53 is configured to allow the refrigerant to pass through the air inlet 111, the third opening 411c, the third chamber 443, the third heat dissipation channel 33 and the air outlet 121.

[0077] In some embodiments, the first fan 51 is disposed at the first opening 411a to allow the coolant to pass through the first opening 411a. The second fan 52 is disposed at the second opening 411b to allow the coolant to pass through the second opening 411b. The third fan 53 is disposed at the third opening 411c to allow the coolant to pass through the third opening 411c.

[0078] In some embodiments, by adjusting the rotation speed of the first fan 51, the total amount of the refrigerant introduced into the first chamber 441 can be adjusted, thereby controlling the flow rate of the refrigerant in the first heat dissipation channel 31 communicating with the first chamber 441;

[0079] In some embodiments, by adjusting the rotation speed of the second fan 52, the total amount of the refrigerant introduced into the second chamber 442 can be adjusted, thereby controlling the flow rate of the refrigerant in the second heat dissipation channel 32 communicating with the second chamber 442;

[0080] In some embodiments, by adjusting the rotation speed of the third fan 53, the total amount of the refrigerant introduced into the third chamber 443 can be adjusted, thereby controlling the flow rate of the refrigerant in the third heat dissipation channel 33 connected to the third chamber 443;

[0081] The cooling scheme is adjusted according to the heat generation conditions in various parts of the energy storage device, so as to improve the cooling effect of the battery module 2 and at the same time achieve the effect of improving energy efficiency.

[0082] In some embodiments, the first fan 51 includes a first blade (not shown), and the first blade is located in the first chamber 441. The first blade is an air supply element of the first fan 51, and the flow of the refrigerant is achieved by the rotation of the first blade. The first blade is located in the first chamber 441, which is conducive to the first blade delivering the refrigerant into the first heat dissipation channel 31.

[0083] In some embodiments, the second fan 52 includes a second blade (not shown), which is located in the second chamber 442 and is an air supply element of the second fan 52. The second blade rotates to realize the flow of the refrigerant, which is conducive to the second blade delivering the refrigerant into the second heat dissipation channel 32.

[0084] In some embodiments, the third fan 53 includes a third fan blade (not shown), and the third fan blade is located in the third chamber 443. The third fan blade is an air supply element of the third fan 53, and the flow of the refrigerant is realized by the rotation of the third fan blade, which is conducive to the third fan blade delivering the refrigerant into the third heat dissipation channel 33.

[0085] like Figure 3 and Figure 4 As shown, Figure 3 and Figure 4 In one embodiment, the first heat dissipation channel 31 is located between adjacent battery modules 2 , the second heat dissipation channel 32 is located between adjacent battery modules 2 , and the third heat dissipation channel 33 is located between adjacent battery modules 2 .

[0086] like Figure 5 and Figure 6 As shown, Figure 5 and Figure 6 In another embodiment, the housing 1 includes a bottom wall 14 and a top wall 13 which are arranged opposite to each other along a first direction X. A third heat dissipation channel 33 is provided between the battery module 2 and the top wall 13. When the refrigerant flows through the third heat dissipation channel 33, the battery module 2 close to the top wall 13 can be cooled.

[0087] like Figure 5 and Figure 6 As shown, in some embodiments, a first heat dissipation channel 31 is provided between the battery module 2 and the bottom wall 14 , and when the refrigerant flows through the first heat dissipation channel 31 , the battery module 2 close to the bottom wall 14 can be cooled.

[0088] In some embodiments, the side portion 42 is a rectangular ring structure, and the side portion 42 includes a first wall 421, a second wall 422, a third wall 423 and a fourth wall 424 that are connected to each other. The first wall 421, the second wall 422, the third wall 423 and the fourth wall 424 are connected to the substrate 41, the third wall 423 and the first wall 421 are opposite to each other along a first direction X, the fourth wall 424 and the second wall 422 are opposite to each other along a third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other; the first wall 421, the second wall 422, the third wall 423, the fourth wall 424 and the substrate 41 enclose a recess 44.

[0089] In some embodiments, the first wall 421 , the second wall 422 , the third wall 423 , the fourth wall 424 and the base plate 41 are integrally formed and have good structural strength.

[0090] In some embodiments, the side portion 42 and the battery module 2 are sealed and connected to further reduce the loss of the refrigerant entering the interior of the housing 1 .

[0091] In some embodiments, a seal (not shown) is provided between the side portion 42 and the battery module 2, and the side portion 42 and the battery module 2 are sealed and connected via the seal. The seal includes but is not limited to glue, a sealing ring, a compressed elastic member, such as a silicone sealing ring, such as foam.

[0092] In some embodiments, the side portion 42 is in contact with the battery module 2 to achieve a sealed connection.

[0093] like Figure 4 and Figure 6 As shown, in some embodiments, the guide member 4 includes an extension portion 43, and the extension portion 43 is connected to the side portion 42. A seal 46 is provided between the extension portion 43 and the battery module 2, and the seal 46 connects the extension portion 43 and the battery module 2. The side portion 42 and the battery module 2 are sealed and connected through the extension portion 43 and the seal 46. The seal 46 includes but is not limited to glue, a sealing ring, and a compressed elastic member, such as a silicone sealing ring, such as foam. Optionally, the seal 46 is bonded and fixed to the extension portion 43, and the seal 46 is bonded and fixed to the battery module 2 to enhance the sealing effect between the guide member 4 and the battery module 2. In other embodiments, the seal 46 is in contact connection with the extension portion 43, the seal 46 is in contact connection with the battery module 2, and the seal 46 is in a compressed state.

[0094] In some embodiments, along the second direction Y, there is a gap between the side portion 42 and the battery module 2, and the gap is less than 5 mm, thereby reducing the outflow of the refrigerant from the gap.

[0095] like Figure 5 and Figure 6 As shown, in some embodiments, the side portion 42 is sealed and connected to the top wall 13, the side portion 42 is sealed and connected to the battery module 2, and the side portion 42 is sealed and connected to the bottom wall 14. The loss of the refrigerant entering the interior of the housing 1 can be further reduced. The side portion 42 can be connected to the battery module 2, the bottom wall 14 and the top wall 13 at the same time by adjusting the length of the guide member 4 along the first direction X. Exemplarily, when the side portion 42 is connected only to the battery module 2, the length of the guide member 4 along the first direction X is H1, and when the side portion 42 is connected to the battery module 2, the bottom wall 14 and the top wall 13 at the same time, the length of the guide member 4 along the first direction X is H2, and H2 is greater than H1.

[0096] In some embodiments, a seal (not shown) is provided between the side portion 42 and the battery module 2, and the side portion 42 and the battery module 2 are sealed and connected via the seal. The seal includes but is not limited to glue, a sealing ring, a compressed elastic member, such as a silicone sealing ring, such as foam.

[0097] In some embodiments, the side portion 42 is in contact with the battery module 2 to achieve a sealed connection.

[0098] In some embodiments, the side portion 42 and the top wall 13 are provided with a seal (not shown), and the side portion 42 and the top wall 13 are sealed and connected by the seal. The seal includes but is not limited to glue, a sealing ring, a compressed elastic member, such as a silicone sealing ring, such as foam.

[0099] In some embodiments, the side portion 42 and the top wall 13 are in contact and connected to achieve a sealed connection.

[0100] In some embodiments, a seal (not shown) is provided between the side portion 42 and the bottom wall 14, and the side portion 42 and the bottom wall 14 are sealed and connected by the seal. The seal includes but is not limited to glue, a sealing ring, a compressed elastic member, such as a silicone sealing ring, such as foam.

[0101] In some embodiments, the side portion 42 and the bottom wall 14 are in contact and connected to achieve a sealed connection.

[0102] In some embodiments, see Figure 5 and Figure 6 , the guide member 4 includes an extension portion 43, and the extension portion 43 is connected to the side portion 42. The energy storage device includes a seal 46, and the seal 46 connects the extension portion 43 and the battery module 2, the seal 46 connects the extension portion 43 and the top wall 13, and the seal 46 connects the extension portion 43 and the bottom wall 14. The seal 46 includes but is not limited to glue, a sealing ring, and a compressed elastic member, such as a silicone sealing ring, such as foam. Optionally, the seal 46 is bonded and fixed to the extension portion 43, the seal 46 is bonded and fixed to the battery module 2, the seal 46 is bonded and fixed to the top wall 13, and the seal 46 is bonded and fixed to the bottom wall 14, so as to improve the sealing effect between the guide member 4 and the battery module 2 and between the guide member 4 and the shell 1. Optionally, the seal 46 is in contact with the extension portion 43 , the seal 46 is in contact with the battery module 2 , the seal 46 is in contact with the top wall 13 , the seal 46 is in contact with the bottom wall 14 , and the seal 46 is in a compressed state.

[0103] like Figure 4 and Figure 6 As shown, in some embodiments, the extension portion 43 includes a first extension portion 431, a second extension portion 432, a third extension portion 433 and a fourth extension portion 434, the first extension portion 431 is connected to the first wall 421, the second extension portion 432 is connected to the second wall 422, the third extension portion 433 is connected to the third wall 423, and the fourth extension portion 434 is connected to the fourth wall 424.

[0104] In some embodiments, the first extension portion 431 , the second extension portion 432 , the third extension portion 433 , and the fourth extension portion 434 are sequentially connected to form an annular sheet structure.

[0105] In some embodiments, the first extension portion 431 , the second extension portion 432 , the third extension portion 433 , and the fourth extension portion 434 are independently spaced apart from each other.

[0106] In some embodiments, the substrate 41 is substantially perpendicular to the second direction Y, the side portion 42 is connected to the periphery of the side portion 42, and the side portion 42 and the extension portion 43 may be a polygonal ring structure or a circular ring structure. The extension portion 43 is connected to the side portion 42 at a position close to the battery module 2.

[0107] In some embodiments, the extension portion 43 is integrally connected to the side portion 42 , and the extension portion 43 is formed by folding a side of the side portion 42 away from the base plate 41 .

[0108] In some embodiments, see Figure 4 and Figure 6 , when viewed along the second direction Y, the extension portion 43 is located inside the recess 44 . In other embodiments, when viewed along the second direction Y, the extension portion 43 is located outside the recess 44 .

[0109] See also Figure 3 The first extension part 431 is sealed and connected to the uppermost battery module 2a. The third extension part 433 is sealed and connected to the lowermost battery module 2b. The second extension part 432 is sealed and connected to each battery module 2. The fourth extension part 434 is sealed and connected to each battery module 2.

[0110] See also Figure 5 The first extension portion 431 is sealed and connected to the top wall 13 , the third extension portion 433 is sealed and connected to the bottom wall 14 , the second extension portion 432 is sealed and connected to each battery module 2 , and the fourth extension portion 434 is sealed and connected to each battery module 2 .

[0111] In some embodiments, along the second direction Y, there is a gap between the side portion 42 and the battery module 2, and the gap is less than 5 mm, thereby reducing the outflow of the refrigerant from the gap.

[0112] In some embodiments, there is a gap between the side portion 42 and the top wall 13 along the second direction Y, and the gap is less than 5 mm. There is a gap between the side portion 42 and the bottom wall 14 along the second direction Y, and the gap is less than 5 mm, reducing the outflow of the refrigerant from the gap.

[0113] like Figure 7As shown, in some embodiments, the housing 1 includes a front wall 11 and a rear wall 12 that are relatively arranged along the second direction Y. The air inlet 111 can be opened on the front wall 11, and the air outlet 121 can be opened on the rear wall 12 to achieve the circulation of the refrigerant. Optionally, when the air inlet 111 is opened on the front wall 11, a dustproof net is provided at the air inlet 111. Optionally, when the air outlet 121 is opened on the rear wall 12, a dustproof net is provided at the air outlet 121. By providing a dustproof net, dust and impurities in the external environment can be reduced from entering the interior of the housing 1, and the cleanliness of the interior of the housing 1 can be maintained.

[0114] In some embodiments, the front wall 11 is disposed opposite to the guide member 4 , the fan 5 is fixed to the guide member 4 , and the air inlet 111 is disposed opposite to the fan 5 , so that the refrigerant passes through the air inlet 111 and the opening 411 on the front wall 11 to reach between the guide member 4 and the battery module 2 .

[0115] like Figure 8 As shown, in some embodiments, the battery module 2 has a pressure relief portion 23, which faces the rear wall 12 and is arranged opposite to the air outlet 121. The pressure relief portion 23 is mainly used to protect the safety of the battery module 2 under abnormal conditions. When dangerous situations such as overpressure, overheating, and overcharging of the battery module 2 occur, the pressure relief portion 23 will open and release the gas and heat inside the battery module 2, thereby reducing the safety problems caused by excessive pressure inside the battery module 2. By making the pressure relief portion 23 face the rear wall 12 and be arranged opposite to the air outlet 121, when the pressure relief portion 23 automatically opens to relieve pressure, the released gas and heat can be directly discharged to the outside of the housing 1 through the air outlet 121, thereby improving the safety of the energy storage device.

[0116] like Figure 8 and Fig. 9 As shown, in some embodiments, the battery module 2 has a first convex portion 24 and a second convex portion 25 arranged at intervals along the third direction Z, and the first convex portion 24 and the second convex portion 25 are located in the first heat dissipation channel 31. The projection of the first convex portion 24 along the second direction Y and the projection of the second convex portion 25 along the second direction Y are located on both sides of the projection of the guide member 4 along the second direction Y, reducing the outflow of the refrigerant in the third direction Z, wherein the third direction Z includes the third direction Z and the direction opposite to the third direction Z.

[0117] like Fig. 9As shown, in some embodiments, among the adjacent battery modules 2, the first convex portion 24 and the second convex portion 25 of one battery module 2 are connected to another battery module 2. For example, the first convex portion 24 and the second convex portion 25 of one battery module 2 are bonded to another battery module 2, thereby fixing the relative position between the two adjacent battery modules 2, and sealing both sides of the first heat dissipation channel 31 along the third direction Z, further reducing the loss of the coolant when it flows along the first heat dissipation channel 31, and further improving the cooling effect of the battery module 2.

[0118] In some embodiments, along the first direction X, the length of the first heat dissipation channel 31 is 5 mm to 20 mm, so that the refrigerant can flow along the first heat dissipation channel 31 between the battery modules 2 and exchange heat with the battery modules 2. The length of the first heat dissipation channel 31 can be adjusted according to the length of the battery module 2.

[0119] In some embodiments, along the first direction X, the length of the second heat dissipation channel 32 is 5 mm to 20 mm, so that the refrigerant can flow along the second heat dissipation channel 32 between the battery modules 2 and exchange heat with the battery modules 2. The length of the second heat dissipation channel 32 can be adjusted according to the length of the battery module 2.

[0120] In some embodiments, along the first direction X, the length of the third heat dissipation channel 33 is 5 mm to 20 mm, so that the refrigerant can flow along the third heat dissipation channel 33 between the battery modules 2 and exchange heat with the battery modules 2. The length of the third heat dissipation channel 33 can be adjusted according to the length of the battery module 2.

[0121] like Fig.10 As shown, in some embodiments, the battery module 2 includes a shell 22 and a plurality of battery cells 21. The battery cells 21 are disposed inside the shell 22, and the battery cells 21 are spaced apart along the third direction Z. In this way, when the refrigerant flows through the first heat dissipation channel 31, the second heat dissipation channel 32 and the third heat dissipation channel 33, each battery cell 21 can be cooled at the same time, thereby reducing the temperature difference between different positions of the same battery cell 21 and improving the safety of the battery module 2.

[0122] In some embodiments, the energy storage device further includes an electrical module 6, which is disposed outside the housing 1 and is electrically connected to the battery module 2. Providing the electrical module 6 outside the housing 1 is beneficial to the heat dissipation of the electrical module 6, reduces the influence of the heat generated by the electrical module 6 on the battery module 2, and reduces the influence of the refrigerant on the electrical module 6.

[0123] In some embodiments, the electrical module 6 includes a plurality of electrical components, and the electrical module 6 controls the charging and discharging of the plurality of battery modules 2 .

[0124] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. An energy storage device, characterized in that: The energy storage device comprises: A housing having an air inlet and an air outlet; A plurality of battery modules are disposed in the housing and arranged along a first direction; A first heat dissipation channel is located between adjacent battery modules, or between the battery module and the housing; the first heat dissipation channel connects the air inlet and the air outlet; A second heat dissipation channel is located between adjacent battery modules; the second heat dissipation channel connects the air inlet and the air outlet; a third heat dissipation channel, located between adjacent battery modules, or between the battery module and the housing; the third heat dissipation channel connects the air inlet and the air outlet; along the first direction, the second heat dissipation channel is located between the first heat dissipation channel and the third heat dissipation channel; a first fan configured to allow refrigerant to pass through the air inlet, the first heat dissipation channel, and the air outlet; a second fan configured to allow refrigerant to pass through the air inlet, the second heat dissipation channel, and the air outlet; a third fan, configured to allow the refrigerant to pass through the air inlet, the third heat dissipation channel and the air outlet; The operating output power of the second fan is greater than the operating output power of the first fan, and the operating output power of the second fan is greater than the operating output power of the third fan.

2. The energy storage device according to claim 1, characterized in that: The air inlet and the air outlet are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction; The energy storage device comprises a first isolating portion and a second isolating portion, wherein along the second direction, the first isolating portion is located between the air inlet and the battery module, and the second isolating portion is located between the air inlet and the battery module; At least a portion of a projection of the second heat dissipation channel along the second direction is located between a projection of the first isolation portion along the second direction and a projection of the second isolation portion along the second direction.

3. The energy storage device according to claim 2, characterized in that: The energy storage device includes a guide member disposed in the housing, the guide member includes a substrate, the substrate is provided with an opening, the opening is connected to the air inlet and the first heat dissipation channel, the air inlet and the second heat dissipation channel, and the air inlet and the third heat dissipation channel, and along the second direction, the substrate and the battery module are spaced apart; The first isolation portion is connected to the substrate and is located between the substrate and the battery module; The second isolation portion is connected to the substrate and is located between the substrate and the battery module.

4. The energy storage device according to claim 3, characterized in that: The guide member includes a side portion connected to the substrate, the side portion is arranged around the substrate, the substrate and the side portion form a recessed portion, and the recessed portion faces the first heat dissipation channel, the second heat dissipation channel and the third heat dissipation channel.

5. The energy storage device according to claim 4, characterized in that: The first isolation part and the second isolation part separate the concave part into a first chamber, a second chamber and a third chamber; The openings include a first opening, a second opening and a third opening, the first opening is in communication with the first chamber, the second opening is in communication with the second chamber, and the third opening is in communication with the third chamber; The first fan is configured to allow the refrigerant to pass through the air inlet, the first opening, the first chamber, the first heat dissipation channel, and the air outlet; The second fan is configured to allow the refrigerant to pass through the air inlet, the second opening and the second chamber, the second heat dissipation channel and the air outlet; The third fan is configured to allow the refrigerant to pass through the air inlet, the third opening and the third chamber, the third heat dissipation channel and the air outlet.

6. The energy storage device according to claim 5, characterized in that: The first fan includes a first blade, and the first blade is located in the first chamber; the second fan includes a second blade, and the second blade is located in the second chamber; the third fan includes a third blade, and the third blade is located in the third chamber.

7. The energy storage device according to any one of claims 3 to 6, characterized in that: The housing comprises a front wall and a rear wall arranged opposite to each other along the second direction; The front wall is arranged opposite to the air guide, and the air inlet is arranged on the front wall; the first fan, the second fan and the third fan are fixed to the air guide, and the first fan, the second fan and the third fan are arranged opposite to the air inlet; The air outlet is arranged on the rear wall.

8. The energy storage device according to claim 7, characterized in that: The battery module has a pressure relief portion, which faces the rear wall and is arranged opposite to the air outlet.

9. The energy storage device according to any one of claims 3 to 8, characterized in that: The battery module has a first convex portion and a second convex portion spaced apart along a third direction, and the first convex portion and the second convex portion are located in the first heat dissipation channel; A projection of the first convex portion along the second direction and a projection of the second convex portion along the second direction are located on two sides of a projection of the flow guide member along the second direction.

10. The energy storage device according to claim 9, characterized in that: Among the battery modules arranged adjacent to each other, the first protrusion and the second protrusion of one of the battery modules are connected to the other battery module.

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