Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device, the battery pack has a first direction, the battery pack comprises a box body, single batteries and an exhaust structure, the box body comprises a cover plate, a frame and a bottom plate, the first direction is perpendicular to the bottom plate, and the cover plate, the frame and the bottom plate are matched to define a containing cavity; the single batteries are accommodated in the accommodating cavities and are provided with battery cell anti-explosion valves, and the battery cell anti-explosion valves are arranged on the single batteries; the exhaust structure comprises an exhaust component and a box body anti-explosion valve, the exhaust component is provided with a flow guide cavity, a current collection cavity and an isolation cavity, the flow guide cavity, the current collection cavity and the isolation cavity are sequentially communicated to form an exhaust channel, the wall surface, facing the battery cell anti-explosion valve, of the flow guide cavity is provided with a flow guide through hole, the isolation cavity penetrates through the frame, and the box body anti-explosion valve is arranged on the exhaust component. The flow guide cavity, the flow collecting cavity and the isolation cavity are sequentially communicated to form an exhaust channel. According to the battery pack provided by the invention, directional discharge and thermoelectric separation of the battery pack can be realized, and the safety of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a battery pack and an electrical device. Background Art

[0002] With the development of the new energy industry, battery safety is currently a major issue. When the battery thermal runaway valve opens, the high-temperature gas and other ejected materials are directly discharged into the battery pack box, without being isolated from other high-voltage parts, electrical parts, battery cell components, etc. inside the box, which can easily cause damage to various components in the box, leading to insulation failure, short circuit, heat diffusion and other problems.

[0003] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art and provides a battery pack and an electrical device.

[0005] According to one aspect of the present application, the present application provides a battery pack having a first direction, wherein the battery pack comprises a box body, a single cell and an exhaust structure, the box body comprises a cover plate, a frame and a bottom plate, the first direction is perpendicular to the bottom plate, the frame is arranged on one side of the bottom plate in the first direction, the cover plate is arranged on the side of the frame away from the bottom plate, the cover plate, the frame and the bottom plate cooperate to enclose a receiving cavity; the single cell is received in the receiving cavity, the single cell has a cell explosion-proof valve, and the cell explosion-proof valve is arranged on one side of the single cell in the first direction; the exhaust structure comprises an exhaust component and a box explosion-proof valve, and the exhaust component is provided with a guide cavity , a collecting cavity and an isolating cavity, the flow guiding cavity, the collecting cavity and the isolating cavity are connected in sequence to form an exhaust channel, the flow guiding cavity is arranged on a side of the single battery having the battery cell explosion-proof valve, the wall surface of the flow guiding cavity facing the battery cell explosion-proof valve is provided with a guide hole, the surface of the single battery provided with the battery cell explosion-proof valve is a first surface, the orthographic projection of the battery cell explosion-proof valve on the plane where the first surface is located is at least partially overlapped with the orthographic projection of the guide hole on the plane of the first surface, one end of the isolating cavity away from the collecting cavity passes through the frame, and the box explosion-proof valve is arranged on the exhaust component and is located at one end of the isolating cavity away from the collecting cavity.

[0006] Further, the battery pack has a preset direction, which is perpendicular to the first direction; the flow guide cavity includes a plurality of flow guide sub-cavities arranged at intervals along the preset direction, and each of the flow guide sub-cavities is provided with a plurality of the flow guide flow holes on the wall facing the single battery, and each of the flow guide sub-cavities is provided with a discharge through-hole on the wall facing the current collecting cavity, and the wall of the current collecting cavity is provided with collecting flow holes and guide through-holes, the discharge through-holes are connected with the collecting flow holes, and the isolation cavity is connected with the current collecting cavity through the guide through-holes.

[0007] Optionally, the flow guide cavity also includes a first buffer sub-cavity and a second buffer sub-cavity, the first buffer sub-cavity is arranged on the side of the flow guide cavity away from the single battery, and the second buffer sub-cavity is arranged on both sides of the flow guide cavity in the preset direction; the extension directions of the flow guide cavity, the first buffer sub-cavity and the second buffer sub-cavity are consistent.

[0008] Further, in the first direction, an inner wall of the flow guide cavity opposite to the flow guide hole is provided with a reinforcing rib, and the reinforcing rib extends along an extending direction of the flow guide cavity.

[0009] Furthermore, the flow guide cavity further includes a third buffer sub-cavity, and the third buffer sub-cavity is arranged on a side of the second buffer sub-cavity away from the flow guide sub-cavity.

[0010] Furthermore, the single cell battery also has a pole, which is arranged on the first surface; the second buffer sub-cavity is flush with the side of the third buffer sub-cavity facing away from the single cell battery, and in the first direction, the size of the second buffer sub-cavity is larger than the size of the third buffer sub-cavity, and the second buffer sub-cavity and the third buffer sub-cavity on both sides of the third buffer sub-cavity are combined to form an avoidance groove, and the pole extends from the first surface toward the third buffer sub-cavity and partially extends into the avoidance groove.

[0011] Furthermore, the battery pack also includes a fireproof plate, which is arranged between the single battery and the diversion cavity, and the fireproof plate has a one-way valve. In the first direction, the orthographic projection of the one-way valve on the plane where the first surface is located at least partially overlaps with the orthographic projection of the battery cell explosion-proof valve and the diversion hole on the plane where the first surface is located.

[0012] Furthermore, the battery pack also has a second direction and a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; the flow guide cavity includes a plurality of flow guide sub-cavities arranged at intervals along the second direction, and the flow guide sub-cavity extends along the third direction, and the wall surface of each of the flow guide sub-cavities facing the single battery is provided with a plurality of the flow guide holes arranged along the third direction; the battery pack also includes a sealing baffle, which extends along the third direction and is arranged on both sides of the battery cell explosion-proof valve in the second direction.

[0013] Furthermore, the frame has a first side wall and a second side wall that are arranged opposite to each other, the first side wall is close to the accommodating cavity, and the second side wall is away from the accommodating cavity, the collecting cavity is arranged on a side of the first side wall close to the accommodating cavity, and the isolation cavity is arranged on a side of the first side wall away from the accommodating cavity, the first side wall has a connecting through hole, and the isolation cavity is connected with the collecting cavity through the connecting through hole.

[0014] Furthermore, the isolation cavity includes a main body and a first mounting part and a second mounting part arranged on opposite sides of the main body, the first mounting part has an isolation through hole, the second mounting part has a mounting through hole, the isolation through hole is connected to the connecting through hole, and the box explosion-proof valve is arranged in the mounting through hole.

[0015] Further, the first mounting portion is arranged on a side of the first side wall away from the accommodating cavity, the second mounting portion is arranged on a side of the second side wall away from the first side wall, and the battery pack also includes a sealing gasket, which is arranged between the first mounting portion and the first side wall; and / or the sealing gasket is arranged between the second mounting portion and the second side wall.

[0016] According to another aspect of the present application, there is provided an electrical device comprising any of the aforementioned battery packs.

[0017] The beneficial effects of the present application are as follows: the present application guides the high-temperature gas and other eruptions ejected from the battery cell explosion-proof valve into the guide cavity through the guide holes on the guide cavity; in addition, the guide cavity, the collecting cavity and the isolation cavity are connected in sequence to form an exhaust channel, and the end of the isolation cavity away from the collecting cavity passes through the frame, that is, the ejected high-temperature gas and other eruptions are guided to the outside of the box through the exhaust channel, thereby achieving directional discharge of the ejected high-temperature gas and other eruptions, while achieving thermal and electrical separation of the battery pack, thereby improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of a battery pack provided in an embodiment of the present application.

[0020] Figure 2 yes Figure 1 Top view of the .

[0021] Figure 3 yes Figure 2 Cross-sectional view at AA in the middle.

[0022] Figure 4 yes Figure 3 Enlarged view of point C in the middle.

[0023] Figure 5 yes Figure 4 Enlarged view of point E in the middle.

[0024] Figure 6 yes Figure 3 Enlarged view of point D in the middle.

[0025] Figure 7 yes Figure 2 Cross-sectional view at BB in the middle.

[0026] Figure 8 yes Figure 7 Enlarged view of point F in the middle.

[0027] Fig. 9 It is an exploded diagram of a battery pack provided in an embodiment of the present application.

[0028] Fig.10 yes Fig. 9 Enlarged view of point G in the middle.

[0029] Fig.11 It is a schematic diagram of a current collecting cavity provided in an embodiment of the present application.

[0030] Fig.12 It is a schematic diagram of an isolation cavity provided in an embodiment of the present application.

[0031] Fig.13 It is a schematic diagram of a single cell provided in an embodiment of the present application.

[0032] Fig.14 It is a schematic diagram of a fireproof board provided in an embodiment of the present application.

[0033] Fig.15 It is a schematic diagram of a flow guide cavity provided in an embodiment of the present application.

[0034] Fig.16 It is a partial cross-sectional view of a battery pack provided in an embodiment of the present application.

[0035] Fig.17 yes Fig.16 Enlarged view of point H in the middle.

[0036] Fig.18 yes Fig.16 An enlarged view of another embodiment at H in the figure.

[0037] In the figure:

[0038] 10. Box body; 11. Cover plate; 12. Frame; 121. First side wall; 1211. Connecting through hole; 122. Second side wall; 13. Bottom plate;

[0039] 20. Accommodating cavity;

[0040] 30. Single cell; 31. Cell explosion-proof valve; 32. First side; 33. Pole;

[0041] 40. Exhaust structure; 400-exhaust component; 41. flow guide cavity; 411. flow guide hole; 412. flow guide cavity; 413. discharge through hole; 414. first buffer sub-cavity; 415. second buffer sub-cavity; 416. reinforcing rib; 417. third buffer sub-cavity; 42. collecting cavity; 421. collecting hole; 422. guide through hole; 43. isolation cavity; 431. main body; 432. first mounting part; 4321. isolation through hole; 433. second mounting part; 4331. mounting through hole; 44. box explosion-proof valve; 45. avoidance groove;

[0042] 50. Partition;

[0043] 60. Fireproof board; 61. One-way valve;

[0044] 70. Sealing strip;

[0045] 80. Sealing gasket;

[0046] 90. Baffle. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0048] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In order to solve the technical problem in the prior art that the high-temperature gas and other ejected materials ejected when the battery thermal runaway valve opens affect the internal components of the battery pack, causing insulation failure, short circuit, heat diffusion, etc., the present application provides a battery pack having a first direction, the battery pack comprising a box body, a single cell and an exhaust structure, the box body comprising a cover plate, a frame and a bottom plate, the first direction is perpendicular to the bottom plate, the frame is arranged on one side of the bottom plate in the first direction, the cover plate is arranged on the side of the frame away from the bottom plate, the cover plate, the frame and the bottom plate cooperate to enclose a accommodating cavity; the single cell is accommodated in the accommodating cavity, the single cell has a battery cell explosion-proof valve, and the battery cell explosion-proof valve is arranged on one side of the single cell in the first direction; the exhaust The structure includes an exhaust component and a box explosion-proof valve, the exhaust component is provided with a guide cavity, a collecting cavity and an isolation cavity, the guide cavity, the collecting cavity and the isolation cavity are connected in sequence to form an exhaust channel, the guide cavity is provided on the side of the single cell with the battery cell explosion-proof valve, the guide cavity is provided with a guide hole on the wall facing the battery cell explosion-proof valve, the surface of the single cell provided with the battery cell explosion-proof valve is the first surface, the orthographic projection of the battery cell explosion-proof valve on the plane where the first surface is located and the orthographic projection of the guide hole on the plane of the first surface at least partially overlap, the end of the isolation cavity away from the collecting cavity passes through the frame, and the box explosion-proof valve is provided on the exhaust component and located at the end of the isolation cavity away from the collecting cavity. The following is a detailed description.

[0050] See also Figure 1 , Figure 2 and Figure 3 In one embodiment, the battery pack has a first direction (eg Figure 1 , Figure 3 , Figure 4 , Figure 7-9 , Fig.13 as well as Fig.16As shown in the middle direction Z, the same below), the battery pack includes a box body 10, a single battery 30 and an exhaust structure 40, the box body 10 includes a cover plate 11, a frame 12 and a bottom plate 13, the first direction is perpendicular to the bottom plate 13, the frame 12 is arranged on one side of the bottom plate 13 in the first direction, and the cover plate 11 is arranged on the side of the frame 12 away from the bottom plate 13, that is, the cover plate 11 and the bottom plate 13 are respectively arranged on both sides of the frame 12 in the first direction, the cover plate 11, the frame 12 and the bottom plate 13 cooperate to enclose a receiving cavity 20, the single battery 30 is accommodated in the receiving cavity 20, and the single battery 30 has a battery cell explosion-proof valve 31, as shown in the middle direction Z, the same below, the battery pack includes a box body 10, a single battery 30 and an exhaust structure 40, the box body 10 includes a cover plate 11, a frame 12 and a bottom plate 13, Fig.13 shown.

[0051] It should be noted that the above-mentioned single battery 30 includes but is not limited to lithium-ion secondary batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present disclosure are not limited to this.

[0052] Further, see Figure 7 and Figure 8 The exhaust structure 40 includes an exhaust component 400 and a box explosion-proof valve 44. The exhaust component 400 is provided with a guide cavity 41, a collecting cavity 42 and an isolation cavity 43, and the guide cavity 41, the collecting cavity 42 and the isolation cavity 43 are sequentially connected to form an exhaust channel. The guide cavity 41 is arranged on the side of the single battery 30 with the battery core explosion-proof valve 31, and the wall of the guide cavity 41 facing the battery core explosion-proof valve 31 is provided with a guide hole 411. In this embodiment, the battery core explosion-proof valve 31 is directly opposite to the guide hole 411. Figure 4 As shown, when the battery cell explosion-proof valve 31 is opened, the gas and eruption materials ejected from the single battery 30 through the battery cell explosion-proof valve 31 can all enter the guide hole 411, and then enter the exhaust channel; in addition, the end of the above-mentioned isolation cavity 43 away from the collecting cavity 42 passes through the above-mentioned frame 12, and the above-mentioned box explosion-proof valve 44 is arranged on the exhaust component 400 and is located at the end of the isolation cavity 43 away from the collecting cavity 42, that is, the box explosion-proof valve 44 is arranged outside the box 10. Through the arrangement of the above-mentioned isolation cavity 43, the gas and eruption materials ejected through the battery cell explosion-proof valve 31 can be guided to the outside of the box 10, without causing adverse effects on the inside of the box 10, thereby realizing the thermal and electrical separation of the battery pack and improving the safety of the battery pack.

[0053] It should be noted that the surface of the above-mentioned single battery 30 provided with the cell explosion-proof valve 31 is the first surface 32, and the orthographic projection of the cell explosion-proof valve 31 on the plane where the first surface 32 is located is at least partially overlapped with the orthographic projection of the flow-conducting hole 411 on the plane where the first surface 32 is located. Such a setting can ensure that the gas and the ejected material ejected from the single battery 30 through the cell explosion-proof valve 31 can enter the exhaust channel in time, and finally be discharged in time through the box explosion-proof valve 44, thereby improving the safety of the battery pack. In some embodiments, half of the area of ​​the cell explosion-proof valve 31 may be directly opposite to the flow-conducting hole 411, which is determined according to the actual battery pack design requirements and is not limited thereto; Figure 8 As shown, the gas and the ejected materials ejected through the battery core explosion-proof valve 31 enter the exhaust channel ( Figure 8 The dotted arrow in the middle is the discharge path of the erupted gas and the erupted material), which can discharge the erupted gas and the erupted material from the battery pack in time; in this embodiment, the above-mentioned guide cavity 41 is arranged below the single battery 30 ( Figure 8 The diversion cavity 41 is flat (e.g. Fig. 9 As shown), the size of the battery pack in the first direction can be effectively reduced, and the volume occupied can be reduced. The flow guide cavity 41 can be a PU pultruded profile with insulation and high temperature resistance, and does not require additional insulation and high temperature protection. It is not limited to this, and in some embodiments, it can also be other forms of settings, which will not be repeated here.

[0054] See also Figure 4 , Fig. 9 , Fig.10 and Fig.11 In one embodiment, the battery pack has a preset direction perpendicular to the first direction. The flow guide cavity 41 includes a plurality of flow guide sub-cavities 412 arranged at intervals along the preset direction. In this embodiment, the number of the flow guide sub-cavities 412 is six. In some embodiments, it can also be limited to other numbers, which is determined according to actual use requirements and is not limited thereto. Each flow guide sub-cavity 412 is evenly provided with a plurality of flow guide holes 411 on the wall surface facing the single battery 30. In this embodiment, each flow guide sub-cavity 412 corresponds to seven flow guide holes 411, that is, in this embodiment, The battery pack is provided with a total of forty-two single cells 30. In other embodiments, the arrangement may be of other numbers, which will not be repeated here. In addition, the single cells 30 are separated by partitions 50, which can effectively increase the strength of the battery pack. The wall of the guide cavity 412 facing the current collecting cavity 42 is provided with a discharge through hole 413, and the wall of the current collecting cavity 42 is provided with a collecting through hole 421 and a guide through hole 422. The discharge through hole 413 is connected with the collecting through hole 421, and the isolation cavity 43 is connected with the current collecting cavity 42 through the guide through hole 422.

[0055] It should be noted that the above-mentioned preset direction can be any direction perpendicular to the first direction. In this embodiment, the above-mentioned battery pack also has a second direction (such as Figure 1 , Figure 3-6 , Figure 8-10 as well as Figure 15-16 The middle direction (shown as X, the same below) and the third direction (as Figure 1 , Figure 7-9 as well as Figure 14-16 The first direction, the second direction and the third direction are perpendicular to each other, and the guide cavity 412 is arranged at intervals along the second direction (that is, the preset direction is the second direction); the discharge through hole 413 is arranged at one end of the guide cavity 412 in the third direction (as shown in the middle direction Y, the same below), Fig.10 As shown), in this configuration, the flow collecting cavity 42 is disposed above the flow guiding cavity 41 in this embodiment ( Figure 8 In the perspective of the battery pack), such a configuration can reduce the space occupied by the battery pack in the third direction. In some embodiments, the current collecting cavity 42 can also be arranged on the left and right sides of the flow guiding cavity 41 ( Figure 8 One of the two sides (in the middle perspective) is determined according to the actual design of the battery pack, which will not be repeated here; the erupted gas and erupted material in each column (third direction) of the single battery 30 enter the same guide cavity 412 through the guide flow hole 411 on the same guide cavity 412, and then are discharged through the discharge through hole 413 corresponding to each guide cavity 412, and the erupted gas and erupted material in the six guide cavities 412 are gathered into the collecting cavity 42 through the collecting flow hole 421 on the collecting cavity 42, and then introduced into the isolation cavity 43 through the guide through hole 422, and finally discharged to the outside of the battery pack through the box explosion-proof valve 44. In the above embodiment, the above-mentioned isolation cavity 43 is provided with two, and the number of the isolation cavity 43 is determined according to the size of the battery pack in the second direction, so as to ensure that the erupted gas and erupted material are discharged from the battery pack in time, which will not be repeated here.

[0056] See also Figure 4 and Figure 5In one embodiment, the flow guiding cavity 41 further includes a second buffer sub-cavity 415 and a second buffer sub-cavity 415. The first buffer sub-cavity 414 is arranged on the side of the flow guiding cavity 412 away from the single battery 30, and the second buffer sub-cavity 415 is arranged on both sides of the flow guiding cavity 412 in the second direction. The extension direction of the flow guiding cavity 412, the first buffer sub-cavity 414 and the second buffer sub-cavity 415 is consistent, and in this embodiment, they all extend along the third direction. Such a configuration can effectively enhance the overall strength of the flow guiding cavity 41, improve the carrying capacity of the single battery 30, and at the same time have the ability of buffer protection, thereby improving the safety of the battery pack. In addition, the first buffer sub-cavity 414 and the second buffer sub-cavity 415 form an isolation cavity on the peripheral side of the flow guiding cavity 412, which is conducive to heat isolation and avoids the influence of the adjacent single battery 30 in the event of thermal runaway.

[0057] Continuing to refer to 4, in one embodiment, in the first direction, the inner wall of the guide cavity 412 opposite to the guide flow hole 411 is provided with a reinforcing rib 416, and the reinforcing rib 416 extends along the extension direction of the guide cavity 412, and in this embodiment, extends along the third direction. Such a configuration can improve the strength of the guide cavity 412, and can resist the impact of the erupted gas and the erupted object on the inner wall of the guide cavity 412. In addition, the extension direction of the reinforcing rib 416 is consistent with the extension direction of the guide cavity 412, and can guide the erupted gas and the erupted object in a direction to ensure smooth discharge of the erupted gas and the erupted object.

[0058] See also Figure 6 , Fig.10 as well as Fig.13 In one embodiment, the above-mentioned guide cavity 41 also includes a third buffer sub-cavity 417, which is arranged on the side of the second buffer sub-cavity 415 away from the guide sub-cavity 412. Through the setting of the third buffer sub-cavity 417, the temperature transfer between adjacent guide sub-cavities 412 can be further blocked, thereby improving the safety of the battery pack.

[0059] Furthermore, the above-mentioned single battery 30 has a pole 33. In the present embodiment, the pole 33 is arranged on the first surface 32. The above-mentioned second buffer sub-cavity 415 is flush with the side of the third buffer sub-cavity 417 facing away from the single battery 30. In the first direction, the size of the above-mentioned second buffer sub-cavity 415 is larger than the size of the third buffer sub-cavity 417. The second buffer sub-cavity 415 and the third buffer sub-cavity 417 on both sides of the above-mentioned third buffer sub-cavity 417 are combined to form an avoidance groove 45. The above-mentioned pole 33 extends from the first surface 32 toward the third buffer sub-cavity 417 and partially extends into the avoidance groove 45. The above-mentioned third buffer sub-cavity 417 can also provide protection for the pole 33.

[0060] It should be noted that, in some embodiments, the pole 33 and the cell explosion-proof valve 31 are arranged on opposite sides, that is, the cell explosion-proof valve 31 is arranged on the first surface 32, and the pole 33 is arranged on the surface opposite to the first surface 32. In this case, there is no need to set the above-mentioned avoidance groove 45, that is, in the first direction, the size of the above-mentioned second buffer sub-cavity 415 is equal to the size of the third buffer sub-cavity 417 (such as Fig.15 In addition, in some embodiments, in order to facilitate the processing and forming of the above-mentioned guide cavity 41, the two ends of the guide cavity 41 in the third direction are non-closed, and the baffle 90 can be set to close the two ends of the guide cavity 41 in the third direction, which will not be repeated here.

[0061] See also Figure 5 and Fig.14 In one embodiment, the battery pack further comprises a fireproof plate 60, which is arranged between the single battery 30 and the flow guide cavity 41. At the same time, the fireproof plate 60 has a one-way valve 61, which is arranged opposite to the battery cell explosion-proof valve 31 and the flow guide hole 411. The thickness of the edge of the fireproof plate 60 is greater than the thickness of the one-way valve 61. After the eruption gas and the eruption material rush out from the battery cell explosion-proof valve 31, the one-way valve 61 will be broken, and the eruption gas and the eruption material entering the flow guide cavity 412 will be discharged from bottom to top ( Figure 5 When the one-way valve 61 is acted on (in the perspective), the one-way valve 61 is resisted by the battery cell explosion-proof valve 31 and will not be broken, thereby achieving the effect of one-way conduction. The ejected high-temperature gas and ejecta will not affect the adjacent single battery 30, thereby avoiding the risk of heat diffusion and improving the safety of the battery pack.

[0062] It should be noted that, in the first direction, the orthographic projection of the one-way valve 61 on the plane where the first surface 32 is located at least partially overlaps with the orthographic projection of the battery cell explosion-proof valve 31 and the diversion hole 411 on the plane where the first surface 32 is located. In some embodiments, they may be directly opposite in some areas, which will not be repeated here.

[0063] See also Figure 4 , Figure 5 and Fig. 9 In one embodiment, the battery pack further includes a sealing strip 70, which extends along the third direction and is arranged on both sides of the battery cell explosion-proof valve 31 in the second direction; in this way, the battery cell explosion-proof valve 31 corresponding to each guide cavity 412 is surrounded by two sealing strips 70, and when the single battery 30 and the guide cavity 41 are bonded and fixed using structural adhesive, the sealing strip 70 can ensure that excess adhesive will not overflow to the battery cell explosion-proof valve 31 and affect the normal opening of the battery cell explosion-proof valve 31.

[0064] See also Fig.12 , Fig.16 and Fig.18In one embodiment, the frame 12 has a first side wall 121 and a second side wall 122 relative to each other, the first side wall 121 is close to the accommodating cavity 20, and the second side wall 122 is away from the accommodating cavity 20, the current collecting cavity 42 is arranged on a side of the first side wall 121 close to the accommodating cavity 20, the isolation cavity 43 is arranged on a side of the first side wall 121 away from the accommodating cavity 20, the first side wall 121 has a connecting through hole 1211, and the isolation cavity 43 is connected with the current collecting cavity 42 through the connecting through hole 1211.

[0065] Further, in the above embodiment, the isolation cavity 43 includes a main body 431 and a first mounting portion 432 and a second mounting portion 433 arranged on opposite sides of the main body 431, the first mounting portion 432 has an isolation through hole 4321, the second mounting portion 433 has a mounting through hole 4331, the isolation through hole 4321 is connected to the connecting through hole 1211, and the box explosion-proof valve 44 is arranged in the mounting through hole 4331. Such an arrangement can facilitate the installation of the isolation cavity 43 and the box explosion-proof valve 44; at the same time, in this embodiment, the first mounting portion 432 is arranged on the side of the first side wall 121 away from the accommodating cavity 20, and the second mounting portion 433 is arranged on the side of the second side wall 122 away from the first side wall 121. The battery pack also includes a sealing gasket 80, which is arranged between the first mounting portion 432 and the first side wall 121. At this time, the second mounting portion 433 and the second side wall 122 can be connected by welding. There is a gap between the first mounting portion 432 and the first side wall 121, which can absorb the assembly tolerance, and the gap between the first mounting portion 432 and the first side wall 121 is filled by the above-mentioned sealing gasket 80.

[0066] It should be noted that, in some embodiments, the gap between the first mounting portion 432 and the first side wall 121 may also be filled and sealed by sealing foam, sealant, etc., which will not be described in detail here; in some embodiments, a sealing gasket 80 (such as Fig.17 As shown), or a sealing gasket 80 is provided between the second mounting portion 433 and the second side wall 122, and between the first mounting portion 432 and the first side wall 121 (schematic diagram not shown), which will not be described here; at the same time, the above-mentioned sealing gasket 80 can also be provided between the collecting cavity 42 and the first side wall 121, and between the collecting cavity 42 and the guide cavity 41, so as to ensure the sealing of the exhaust channel, which will not be described here.

[0067] On the other hand, the present application also includes an electrical device, including any one of the battery packs described above.

[0068] The battery pack and electrical device provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present application.

Claims

1. A battery pack, characterized in that: Having a first direction (Z), the battery pack comprises: A box body (10), comprising a cover plate (11), a frame (12) and a bottom plate (13), wherein the first direction (Z) is perpendicular to the bottom plate (13), the frame (12) is arranged around one side of the bottom plate (13) in the first direction (Z), the cover plate (11) is arranged on a side of the frame (12) away from the bottom plate (13), and the cover plate (11), the frame (12) and the bottom plate (13) cooperate to enclose a containing cavity (20); A single cell (30) is accommodated in the accommodation cavity (20), the single cell (30) having a cell explosion-proof valve (31), the cell explosion-proof valve (31) being arranged on one side of the single cell (30) in the first direction (Z); and An exhaust structure (40) comprises an exhaust component (400) and a box explosion-proof valve (44); the exhaust component (400) is provided with a flow guide cavity (41), a flow collecting cavity (42) and an isolation cavity (43); the flow guide cavity (41), the flow collecting cavity (42) and the isolation cavity (43) are sequentially connected to form an exhaust channel; the flow guide cavity (41) is arranged on a side of the single battery (30) having the battery cell explosion-proof valve (31); a wall surface of the flow guide cavity (41) facing the battery cell explosion-proof valve (31) is provided with a flow guide hole (411) ), the surface of the single battery (30) on which the battery cell explosion-proof valve (31) is provided is the first surface (32), the orthographic projection of the battery cell explosion-proof valve (31) on the plane where the first surface (32) is located at least partially overlaps with the orthographic projection of the flow-conducting hole (411) on the plane of the first surface (32), one end of the isolation cavity (43) away from the current collecting cavity (42) passes through the frame (12), and the box explosion-proof valve (44) is arranged on the exhaust component (400) and is located at one end of the isolation cavity (43) away from the current collecting cavity (42).

2. The battery pack according to claim 1, characterized in that: The battery pack has a preset direction, and the preset direction is perpendicular to the first direction (Z); The flow guide cavity (41) comprises a plurality of flow guide cavities (412) arranged at intervals along the preset direction, a wall surface of each of the flow guide cavities (412) facing the single battery (30) is provided with a plurality of the flow guide holes (411), and a wall surface of each of the flow guide cavities (412) facing the current collecting cavity (42) is provided with a discharge through hole (413), a wall surface of the current collecting cavity (42) is provided with a collecting through hole (421) and a guide through hole (422), the discharge through hole (413) is connected to the collecting through hole (421), and the isolation cavity (43) is connected to the current collecting cavity (42) via the guide through hole (422).

3. The battery pack according to claim 2, characterized in that: The flow guide cavity (41) further comprises a first buffer sub-cavity (414) and a second buffer sub-cavity (415); the first buffer sub-cavity (414) is arranged on a side of the flow guide cavity (412) away from the single battery (30); and the second buffer sub-cavity (415) is arranged on both sides of the flow guide cavity (412) in the preset direction; the extension directions of the flow guide cavity (412), the first buffer sub-cavity (414) and the second buffer sub-cavity (415) are consistent.

4. The battery pack according to claim 2, characterized in that: In the first direction (Z), an inner wall of the flow guide cavity (412) opposite to the flow guide hole (411) is provided with a reinforcing rib (416), and the reinforcing rib (416) extends along the extension direction of the flow guide cavity (412).

5. The battery pack according to claim 3, characterized in that: The flow guide cavity (41) further comprises a third buffer sub-cavity (417), and the third buffer sub-cavity (417) is arranged on a side of the second buffer sub-cavity (415) facing away from the flow guide sub-cavity (412).

6. The battery pack according to claim 5, characterized in that: The single cell (30) further comprises a pole (33), wherein the pole (33) is arranged on the first surface (32); the second buffer sub-cavity (415) is flush with a side of the third buffer sub-cavity (417) facing away from the single cell (30); in the first direction (Z), the size of the second buffer sub-cavity (415) is larger than the size of the third buffer sub-cavity (417); the second buffer sub-cavity (415) and the third buffer sub-cavity (417) on both sides of the third buffer sub-cavity (417) are combined to form an avoidance groove (45); the pole (33) extends from the first surface (32) toward the third buffer sub-cavity (417) and partially extends into the avoidance groove (45).

7. The battery pack according to claim 1, characterized in that: The battery pack further comprises a fireproof plate (60), wherein the fireproof plate (60) is arranged between the single battery (30) and the flow guide cavity (41), and the fireproof plate (60) has a one-way valve (61), and in the first direction (Z), the orthographic projection of the one-way valve (61) on the plane where the first surface (32) is located at least partially overlaps with the orthographic projection of the battery cell explosion-proof valve (31) and the flow guide hole (411) on the plane where the first surface (32) is located.

8. The battery pack according to claim 1, wherein: The battery pack further has a second direction (X) and a third direction (Y), and the first direction (Z), the second direction (X) and the third direction (Y) are perpendicular to each other; The flow guide cavity (41) comprises a plurality of flow guide sub-cavities (412) arranged at intervals along the second direction (X), the flow guide sub-cavities (412) extending along the third direction (Y), and the wall surface of each of the flow guide sub-cavities (412) facing the single battery (30) is provided with a plurality of the flow guide holes (411) arranged along the third direction (Y); the battery pack further comprises a sealing baffle (70), the sealing baffle (70) extending along the third direction (Y) and arranged on both sides of the battery cell explosion-proof valve (31) in the second direction (X).

9. The battery pack according to claim 1, characterized in that: The frame (12) comprises a first side wall (121) and a second side wall (122) which are arranged opposite to each other, the first side wall (121) being close to the accommodating cavity (20), and the second side wall (122) being away from the accommodating cavity (20), the collecting cavity (42) being arranged on a side of the first side wall (121) close to the accommodating cavity (20), the isolating cavity (43) being arranged on a side of the first side wall (121) away from the accommodating cavity (20), the first side wall (121) having a connecting through hole (1211), and the isolating cavity (43) being connected to the collecting cavity (42) via the connecting through hole (1211).

10. The battery pack according to claim 9, characterized in that: The isolation cavity (43) comprises a main body (431) and a first mounting portion (432) and a second mounting portion (433) arranged on opposite sides of the main body (431), wherein the first mounting portion (432) has an isolation through hole (4321), and the second mounting portion (433) has a mounting through hole (4331), wherein the isolation through hole (4321) is connected to the connecting through hole (1211), and the box explosion-proof valve (44) is arranged in the mounting through hole (4331).

11. The battery pack according to claim 10, characterized in that: The first mounting portion (432) is arranged on a side of the first side wall (121) away from the accommodating cavity (20), the second mounting portion (433) is arranged on a side of the second side wall (122) away from the first side wall (121), the battery pack further comprises a sealing gasket (80), and the sealing gasket (80) is arranged between the first mounting portion (432) and the first side wall (121); and / or The sealing gasket (80) is disposed between the second mounting portion (433) and the second side wall (122).

12. An electrical device, characterized in that: Comprising a battery pack as claimed in any one of claims 1 to 11.

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