Battery device and energy storage apparatus

Abstract

The application discloses a battery device and an energy storage equipment. The battery device comprises a box body, a battery monomer and a partition plate. The box body is internally provided with a cavity, and the partition plate divides the cavity into a flow guide cavity and a containing cavity. The flow guide cavity is in communication with the outside of the box body, and the flow guide cavity is separated from the containing cavity. The battery monomer is located in the containing cavity, and the battery monomer comprises an explosion-proof valve. A cover element is arranged on the side wall of the containing cavity corresponding to the explosion-proof valve, the cover element covers the explosion-proof valve, the cover element is provided with an explosion-proof cavity corresponding to the explosion-proof valve, the explosion-proof cavity is separated from the flow guide cavity, the cover element is connected with a weak part, and the weak part is configured to be broken under the impact of the gas sprayed by the explosion-proof valve to make the flow guide cavity and the explosion-proof cavity in communication. In the battery device, when the battery monomer does not occur thermal runaway, the air and moisture outside the box body cannot enter the containing cavity through the flow guide cavity, so that the normal use of the battery device is ensured, and when the battery monomer occurs thermal runaway, the gas sprayed by the explosion-proof valve can be discharged outside the box body through the flow guide cavity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a battery device and an energy storage equipment. BACKGROUND

[0002] In the related art, the box body of the battery is generally a sealed structure, the upper cover is completely sealed with the lower box body, or a flow guide channel is arranged on the upper cover to directly discharge the gas. However, 1) when the upper cover is completely sealed with the lower box body, the gas generated by thermal runaway of the battery monomer cannot be completely discharged; 2) when the flow guide channel is arranged on the upper cover, the flow guide channel is in communication with the space inside the box body, so that air moisture and the like can enter, thereby affecting the normal use of the battery device. SUMMARY

[0003] The present application provides a battery device and an energy storage equipment.

[0004] The battery device of the present application comprises a box body, a battery monomer and a partition plate.

[0005] The box body is provided with a cavity, and the partition plate divides the cavity into a flow guide cavity and a containing cavity, the flow guide cavity is in communication with the outside of the box body, and the flow guide cavity is separated from the containing cavity.

[0006] The battery monomer is located in the containing cavity, and the battery monomer comprises an explosion-proof valve.

[0007] The side wall of the containing cavity corresponding to the explosion-proof valve is provided with a cover element, the cover element covers the explosion-proof valve, the cover element is provided with an explosion-proof cavity corresponding to the explosion-proof valve, the explosion-proof cavity is separated from the flow guide cavity, and the cover element is connected with a weak part, the weak part is configured to be broken to make the flow guide cavity and the explosion-proof cavity communicate in the case that the gas spouted by the explosion-proof valve impacts.

[0008] In the above battery device, when the battery monomer does not occur thermal runaway, the containing cavity is separated from the flow guide cavity, and the explosion-proof cavity is separated from the flow guide cavity, so that the air moisture outside the box body cannot enter the containing cavity through the flow guide cavity, thereby ensuring the normal use of the battery device, when the battery monomer occurs thermal runaway, the weak part is configured to be broken to make the flow guide cavity and the explosion-proof cavity communicate in the case that the gas spouted by the explosion-proof valve impacts, thereby the gas spouted by the explosion-proof valve can be discharged outside the box body through the flow guide cavity.

[0009] In some embodiments, the flow guide cavity is provided with opposite first and second plates, the first and second plates are connected with the cover element, and at least one of the first and second plates is provided with the weak part.

[0010] In this way, the weak part can be formed on the first plate and / or the second plate.

[0011] In some embodiments, a spacer is arranged in the flow guide cavity, a first flow guide passage is formed between the first plate and the side wall of the flow guide cavity, and a second flow guide passage is formed between the spacer and the second plate.

[0012] In this way, the discharge of high-pressure gas can be accelerated.

[0013] In some embodiments, a groove is arranged in the side wall of at least one of the first plate and the second plate, and the bottom wall of the groove constitutes the weak part.

[0014] In this way, the weak part is easily formed.

[0015] In some embodiments, the box body comprises a lower cavity and an upper cover, the lower cavity is connected to the upper cover and encloses the cavity, and the partition plate is arranged on the inner side of the upper cover.

[0016] In this way, the assembly efficiency of the battery device can be improved.

[0017] In some embodiments, the upper cover comprises a cover body and a side wall, the side wall is connected to the edge of the cover body, the partition plate is connected to the side wall of the side wall, the side wall comprises a first side wall and a second side wall along the length direction of the battery device, at least one of the first side wall and the second side wall is provided with a through hole, and the through hole is communicated with the flow guide cavity.

[0018] In this way, the gas sprayed by the explosion-proof valve can be discharged through the through hole on the side wall.

[0019] In some embodiments, a plurality of battery monomers are arranged to form a battery module along the length direction of the battery device, a plurality of battery modules are arranged along the width direction of the battery device, a plurality of cover members are connected to form a flow guide structure along the length direction of the battery device, and a plurality of flow guide structures correspond to a plurality of battery modules one by one.

[0020] In this way, the structural strength of the box body can be ensured.

[0021] In some embodiments, the flow guide structure is connected to the side plates along the length direction of the battery device.

[0022] In this way, the structural strength of the box body can be further improved.

[0023] In some embodiments, the flow guide structure is connected to the side plate along the height direction of the battery device and the partition plate.

[0024] In this way, the structural strength of the box body can be further improved.

[0025] An energy storage device according to an embodiment of the present invention includes the battery device of any of the above embodiments.

[0026] In the aforementioned energy storage device, when the battery cell does not experience thermal runaway, the containment cavity is isolated from the flow guide cavity, and the explosion-proof cavity is isolated from the flow guide cavity, preventing air and moisture from the outside of the enclosure from entering the containment cavity through the flow guide cavity, thus ensuring the normal operation of the battery device. When the battery cell experiences thermal runaway, the weak point is configured to rupture under the impact of the gas ejected from the explosion-proof valve, thereby connecting the flow guide cavity and the explosion-proof cavity, allowing the gas ejected from the explosion-proof valve to be discharged outside the enclosure through the flow guide cavity.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a perspective view of the battery device according to an embodiment of the present invention;

[0030] Figure 2 This is another perspective view of the battery device according to an embodiment of the present invention;

[0031] Figure 3 This is an exploded view of the battery device according to an embodiment of the present invention;

[0032] Figure 4 This is another exploded view of the battery device according to an embodiment of the present invention;

[0033] Figure 5 This is a further exploded view of the battery device according to an embodiment of the present invention;

[0034] Figures 6-7 This is a structural diagram of the upper cover according to an embodiment of the present invention;

[0035] Figure 8 This is a cross-sectional view of the battery device according to an embodiment of the present invention.

[0036] Figure 9 for Figure 8 An enlarged view of part A of the battery device;

[0037] Figure 10Another sectional view of the battery device of the embodiment of the present application.

[0038] Figure 11 An enlarged view of B portion of the battery device of Figure 10

[0039] BRIEF DESCRIPTION OF DRAWINGS

[0040] Battery device-100, box-12, battery cell-14, partition-16, cavity-18, flow guide cavity-20, containing cavity-22, explosion-proof valve-24, cover-26, explosion-proof cavity-28, weak part-30, lower cavity-32, upper cover-34, front plate-36, fan-38, connecting end-40, control board-42, first plate-44, second plate-46, spacer-48, first flow guide channel-50, second flow guide channel-52, groove-54, cover-56, first side plate-58, second side plate-60, through hole-62, battery module-64, flow guide structure-66. DETAILED DESCRIPTION

[0041] The embodiments of the present application are described below in detail, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, for the purpose of explanation, and are not to be understood as a limitation of the present application.

[0042] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0043] ​In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected. It can be mechanical connection, or electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "lower", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0045] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and in itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0046] Please refer to Figures 1-5 The battery device 100 provided by the embodiment of the present application includes a box body 12, a battery monomer 14 and a partition plate 16.

[0047] The box body 12 is provided with a cavity 18, and the partition plate 16 divides the cavity 18 into a flow guide cavity 20 and a containing cavity 22. The flow guide cavity 20 is in communication with the outside of the box body 12, and the flow guide cavity 20 is separated from the containing cavity 22. The battery monomer 14 is located in the containing cavity 22, and the battery monomer 14 includes a burst valve 24. The side wall of the containing cavity 22 corresponding to the burst valve 24 is provided with a cover member 26, the cover member 26 covers the burst valve 24, the cover member 26 is provided with a burst cavity 28 corresponding to the burst valve 24, the burst cavity 28 is separated from the flow guide cavity 20, and the cover member 26 is connected with a weak part 30. The weak part 30 is configured to be broken under the impact of the gas sprayed by the burst valve 24 to make the flow guide cavity 20 and the burst cavity 28 communicate.

[0048] In the battery device 100, when the battery cell 14 does not occur thermal runaway, the accommodation cavity 22 is separated from the flow guide cavity 20, and the explosion-proof cavity 28 is separated from the flow guide cavity 20, so that the air and moisture outside the box body 12 cannot enter the accommodation cavity 22 through the flow guide cavity 20, ensuring the normal use of the battery device 100. When the battery cell 14 occurs thermal runaway, the weak part 30 is configured to be broken under the impact of the gas sprayed by the explosion-proof valve 24 to make the flow guide cavity 20 communicate with the explosion-proof cavity 28, and then the gas sprayed by the explosion-proof valve 24 can be discharged outside the box body 12 through the flow guide cavity 20.

[0049] Specifically, the box body 12 can be a metal box body or a non-metal box body, which is not specifically limited here. When the box body 12 is a metal box body, an insulating film can be optionally arranged between the battery cell 14 and the side wall of the box body 12 to insulate the box body 12 from the battery cell 14. When the box body 12 is a non-metal box body, the structural strength of the box body 12 needs to be ensured.

[0050] In Figure 3 , the box body 12 includes a lower cavity 32 and an upper cover 34, and the lower cavity 32 connects the upper cover 34 and encloses the cavity 18. Optionally, the upper cover 34 is detachably connected to the lower cavity 32 to facilitate the maintenance and assembly of the battery device 100.

[0051] The lower cavity 32 includes a front plate 36, and the outer side of the front plate 36 is provided with a fan 38, two connection ends 40 and a control board 42. The two connection ends 40 can be electrically connected to external equipment to supply power to the external equipment or charge the battery cell 14 by the external equipment.

[0052] The front plate 36 is provided with an exhaust port, and the fan 38 is installed at the exhaust port. The fan 38 can discharge the air in the accommodation cavity 22 to the outside of the box body 12 from the exhaust port to cool the battery cell 14. It can be understood that in other embodiments, the battery device 100 can also use a liquid cooling plate to dissipate heat from the battery cell 14, and is not limited to the fan 38 for heat dissipation, which is not specifically limited here.

[0053] The control board 42 can be electrically connected to the battery cell 14 to collect state signals of the battery cell 14, including but not limited to temperature, power, voltage and other signals, to control the operating state of the battery device 100, such as heat dissipation, charging, discharging or protection of the battery cell 14.

[0054] The partition plate 16 can separate the cavity 18 into the flow guide cavity 20 and the accommodation cavity 22. In Figure 9 , the lower cavity 32 connects the upper cover 34 and encloses the cavity 18, and the partition plate 16 is arranged on the inner side of the upper cover 34. In this way, the assembly efficiency of the battery device 100 can be improved.

[0055] Specifically, the partition plate 16 is arranged at the inner side of the upper cover 34, and the lower cavity 32 is provided with the accommodating cavity 22, so that when the upper cover 34 is mounted on the lower cavity 32, the partition plate 16 can divide the hollow cavity 18 into the flow guide cavity 20 and the accommodating cavity 22, thereby improving the assembly efficiency of the battery device 100. It can be understood that the partition plate 16 can also be arranged on other side plates of the box body 12, and is not limited to the upper cover 34.

[0056] When the battery monomer 14 occurs thermal runaway, the high-pressure gas sprayed by the explosion-proof valve 24 can break the weak part 30, and the high-pressure gas enters the flow guide cavity 20 through the broken part and is discharged to the outside of the box body 12.

[0057] Further, the battery monomers 14 are regularly arranged in a certain order, and the spacing and size of different explosion-proof valves 24 are defined. Therefore, considering the case of battery monomer 14 spray valve (explosion-proof valve 24 explosion), the side wall of the battery monomer 14 above the explosion-proof valve 24 and connected with the cover member 26 is processed to form a weak part 30. The cover member 26 corresponds to the explosion-proof valve 24 in the height direction of the battery device 100. When the battery monomer 14 occurs thermal runaway, in addition to spraying high-pressure gas, other substances will also be sprayed from the explosion-proof valve 24. The other substances sprayed from the explosion-proof valve 24 can pass through the broken part into the flow guide cavity 20 and fall in the flow guide cavity 20, avoiding other substances falling on other battery monomers 14 to cause more battery monomers 14 thermal runaway, thereby improving the safety of the battery device 100.

[0058] In Figure 1 , the height direction of the battery device 100 can be the up-down direction, the length direction can be the front-rear direction, and the width direction can be the left-right direction.

[0059] In some embodiments, the flow guide cavity 20 is provided with opposite first and second plates 44 and 46, the first and second plates 44 and 46 are connected with the cover member 26, and at least one of the first and second plates 44 and 46 is provided with a weak part 30.

[0060] In this way, the weak part 30 can be formed on the first and / or second plates 44 and 46.

[0061] Specifically, in Figure 11 , the first and second plates 44 and 46 are arranged in parallel, the first plate 44 is a left plate, the second plate 46 is a right plate, and the first and second plates 44 and 46 are both provided with a weak part 30. The high-pressure gas sprayed by the explosion-proof valve 24 first enters the explosion-proof cavity 28 from bottom to top, and then collides with the top wall of the explosion-proof cavity 28. The high-pressure gas is divided into left and right two paths by the top wall of the explosion-proof cavity 28. The left path gas breaks through the weak part 30 on the left plate, and the right path gas breaks through the weak part 30 on the right plate, so that the high-pressure gas can quickly enter the flow guide cavity 20 and then be discharged to the outside of the box body 12.

[0062] In some embodiments, the spacer 48 is arranged in the flow guide cavity 20, the first flow guide passage 50 is formed between the first plate 44 and the sidewall of the flow guide cavity 20, and the second flow guide passage 52 is formed between the spacer 48 and the second plate 46.

[0063] In this way, the discharge of the high-pressure gas can be accelerated.

[0064] Specifically, in one embodiment, the first plate 44 and the second plate 46 are each provided with a weak portion 30, and the first flow guide passage 50 and the second flow guide passage 52 extend along the length direction of the battery device 100, so that the gas discharged from the weak portion 30 can be guided to the front end and / or the rear end of the battery device 100. The high-pressure gas discharged from one explosion-proof valve 24 can be guided away by the first flow guide passage 50 and the second flow guide passage 52, and thus the discharge of the high-pressure gas can be accelerated.

[0065] In some embodiments, the sidewall of at least one of the first plate 44 and the second plate 46 is provided with a groove 54, and the bottom wall of the groove 54 constitutes the weak portion 30.

[0066] In this way, the weak portion 30 can be easily formed.

[0067] Specifically, in one embodiment, the sidewall of the first plate 44 and the sidewall of the second plate 46 are each provided with a groove 54. Figure 11 In this way, the weak portion 30 can be easily formed.

[0068] The shape of the groove 54 can be determined according to requirements, and is not specifically limited herein.

[0069] It can be understood that, in other embodiments, the sidewall of the first plate 44 or the sidewall of the second plate 46 is provided with a groove 54.

[0070] In some embodiments, the upper cover 34 includes a cover body 56 and a side wall plate, the side wall plate is connected to the edge of the cover body 56, the side wall of the spacer 16 is connected to the side wall plate, the side wall plate includes a first side wall plate 58 and a second side wall plate 60 along the length direction of the battery device 100, at least one of the first side wall plate 58 and the second side wall plate 60 is provided with a through hole 62, and the through hole 62 communicates with the flow guide cavity 20.

[0071] In this way, the gas discharged from the explosion-proof valve 24 can be discharged through the through hole 62 of the side wall plate.

[0072] Specifically, the side wall plate, the cover body 56 and the spacer 16 enclose the flow guide cavity 20, and at least one of the first side wall plate 58 and the second side wall plate 60 is provided with a through hole 62. Figure 3In the battery device 100, multiple battery cells 14 are arranged along the length of the battery device 100 to form a battery module 64, and two battery modules 64 are arranged along the width of the battery device 100. Each battery module 64 has a first flow channel 50 and a second flow channel 52 on both sides of the cover 26.

[0073] exist Figure 8 In this configuration, the first side panel 58 is the front side panel, and the second side panel 60 is the rear side panel. Both the first side panel 58 and the second side panel 60 are provided with through holes 62. The first side panel 58 has four through holes 62, which respectively connect to the front ends of the two first flow channels 50 and the two second flow channels 52. The second side panel 60 has four through holes 62, which respectively connect to the rear ends of the two first flow channels 50 and the two second flow channels 52.

[0074] The high-pressure gas ejected from the explosion-proof valve 24 can break through the weak parts 30 on the first plate 44 and the second plate 46, and enter the first guide channel 50 and the second guide channel 52 respectively, and be discharged to the outside of the box 12 through the through hole 62 on the side panel.

[0075] In some embodiments, multiple battery cells 14 are arranged along the length of the battery device 100 to form a battery module 64, multiple battery modules 64 are arranged along the width of the battery device 100, and multiple cover members 26 are connected along the length of the battery device 100 to form a flow guiding structure 66, and multiple flow guiding structures 66 correspond one-to-one with multiple battery modules 64.

[0076] In this way, the structural strength of the box 12 can be guaranteed.

[0077] Specifically, the length direction of the battery device 100 can be Figure 3 In the front-to-back direction, the width direction of the battery device 100 can be... Figure 3 The left and right directions. In Figure 3 In the cavity 22, there are two battery modules 64. The two battery modules 64 can be electrically connected in series, in parallel or in series-parallel. The multiple battery cells 14 of a battery module 64 can be electrically connected in series, in parallel or in series-parallel. No specific limitation is made here.

[0078] Multiple cover members 26 connected along the length of the battery device 100 form a flow guiding structure 66, which can act as a reinforcing rib to prevent deformation of the housing 12 and ensure the structural strength of the housing 12.

[0079] Multiple flow guiding structures 66 correspond one-to-one with multiple battery modules 64. Please refer to... Figure 3 and Figure 7In some embodiments, the two flow guide structures 66 are connected to two side plates of the battery device 100 along the length direction.

[0080] In some embodiments, the flow guide structure 66 is connected to a side plate of the battery device 100 along the height direction.

[0081] In this way, the structural strength of the box 12 can be further improved.

[0082] Specifically, in the embodiments shown in FIGS. 1-3, the two flow guide structures 66 are arranged on the inner side surface of the cover body 56 of the upper cover 34, and the spacer 48 is arranged between the two flow guide structures 66. Figures 5-7 In this way, the structural strength of the upper cover 34 along the length direction of the battery device 100 can be further improved.

[0083] In some embodiments, the flow guide structure 66 is connected to a side plate of the battery device 100 along the height direction.

[0084] In this way, the structural strength of the box 12 can be further improved.

[0085] Specifically, in the embodiments shown in FIGS. 1-3, the two flow guide structures 66 are arranged on the inner side surface of the cover body 56 of the upper cover 34, and the spacer 48 is arranged between the two flow guide structures 66. Figures 5-7 In this way, the structural strength of the upper cover 34 along the length direction of the battery device 100 can be further improved.

[0086] In the embodiments shown in FIGS. 1-3, the flow guide structure 66 is connected to the cover body 56 and the spacer 16 of the battery device 100 along the height direction, and is connected to the first side plate 58 and the second side plate 60 of the battery device 100 along the length direction. Figures 5-9 Figure 11 In this way, the structural strength of the entire upper cover 34 can be improved.

[0087] An energy storage device according to an embodiment of the present application includes the battery device 100 according to any one of the above embodiments.

[0088] ​In the above energy storage device, when the battery cell 14 does not occur thermal runaway, the accommodation cavity 22 is cut off from the flow guide cavity 20, and the explosion-proof cavity 28 is cut off from the flow guide cavity 20, so that the air and moisture outside the box 12 cannot enter the accommodation cavity 22 through the flow guide cavity 20, ensuring the normal use of the battery device 100. When the battery cell 14 occurs thermal runaway, the weak part 30 is configured to be broken under the impact of the gas sprayed by the explosion-proof valve 24 to make the flow guide cavity 20 communicate with the explosion-proof cavity 28, and then the gas sprayed by the explosion-proof valve 24 can be discharged out of the box 12 through the flow guide cavity 20.

[0089] Specifically, the energy storage device can further include a cluster rack, and one or more battery devices 100 can be installed on the cluster rack. The plurality of battery devices 100 can be arranged in an array on the cluster rack. The plurality of battery devices 100 can be electrically connected in series, in parallel, or in series-parallel.

[0090] The energy storage device can include, but is not limited to, an energy storage container, a household energy storage cabinet, and the like.

[0091] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0092] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that, Includes the casing, individual battery cells, and separators; The box has a cavity inside, and the partition divides the cavity into a flow guiding cavity and a receiving cavity. The flow guiding cavity is connected to the outside of the box, and the flow guiding cavity is separated from the receiving cavity. The battery cell is located within the receiving cavity, and the battery cell includes an explosion-proof valve; A cover is provided on the side wall of the receiving cavity corresponding to the explosion-proof valve. The cover covers the explosion-proof valve and has an explosion-proof cavity corresponding to the explosion-proof valve. The explosion-proof cavity is separated from the flow guiding cavity. The cover is connected to a weak part, which is configured to rupture under the impact of the gas ejected from the explosion-proof valve so that the flow guiding cavity and the explosion-proof cavity can communicate. The flow guiding cavity is provided with a first plate and a second plate opposite to each other. The first plate and the second plate are connected to the cover member. Both the first plate and the second plate are provided with the weak part. The flow guiding cavity is provided with a spacer. A first flow guiding channel is formed between the first plate and the side wall of the flow guiding cavity. A second flow guiding channel is formed between the spacer and the second plate.

2. The battery device according to claim 1, characterized in that, At least one of the first plate and the second plate has a groove on its sidewall, and the bottom wall of the groove constitutes the weak part.

3. The battery device according to claim 1, characterized in that, The box includes a lower cavity and an upper cover. The lower cavity is connected to the upper cover and forms the cavity. The partition is located inside the upper cover.

4. The battery device according to claim 3, characterized in that, The top cover includes a cover body and a side panel. The side panel is connected to the edge of the cover body. The partition is connected to the side wall of the side panel. The side panel includes a first side panel and a second side panel along the length direction of the battery device. At least one of the first side panel and the second side panel is provided with a through hole, which communicates with the flow guide cavity.

5. The battery device according to claim 1, characterized in that, Multiple battery cells are arranged along the length of the battery device to form a battery module, multiple battery modules are arranged along the width of the battery device, and multiple cover members are connected along the length of the battery device to form a flow guiding structure. The multiple flow guiding structures correspond one-to-one with the multiple battery modules.

6. The battery device according to claim 5, characterized in that, The flow guiding structure connects the two side plates of the battery device along its length.

7. The battery device according to claim 5, characterized in that, The flow guiding structure connects one side plate of the battery device along the height direction and the separator.

8. An energy storage device, characterized in that, Includes the battery device according to any one of claims 1-7.

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