Battery box, battery pack and electric equipment

Abstract

The utility model provides a battery box, a battery pack and electric equipment, and the battery box comprises a box body structure which is internally provided with a containing cavity; the accommodating cavity is provided with a first binding surface which is abutted against and matched with the battery cell, and the first binding surface is provided with an air hole; a bearing beam; the end, in the extending direction, of the bearing beam is a first end, and the first end faces the first binding face. An anti-explosion pressure stabilizing valve; wherein the box body structure comprises a box body frame and a bottom protection plate arranged on the box body frame; the first end is projected to the first binding face in the extending direction of the bearing beam to form a first projection, and at least one part of the air hole is located in the first projection and communicated with the containing cavity. According to the explosion-proof pressure stabilizing valve, at least one part of the air hole is not shielded by the battery cell attached to the first attaching surface, so that the reliable communication between the air hole and the accommodating cavity is ensured, the air permeability of the first attaching surface is improved, and the connectivity between the explosion-proof pressure stabilizing valve and the outside of the battery box is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular, to a battery box, a battery pack and an electrical equipment. Background Art

[0002] With the continuous development of social economy and the continuous innovation of science and technology, power batteries are widely used in electric vehicles due to their advantages of high voltage, high energy, small volume, wide operating temperature range, etc. At the same time, the safety problem of batteries has become the focus of social attention. After the battery cells in the battery pack are thermally out of control, high-temperature and high-pressure gases and molten substances will be generated, which will have an adverse impact on other components in the battery box, such as electrical connection buses, low-voltage wire harnesses, and other battery cells. Structures are easily affected, and accidents such as thermal runaway or arcing of adjacent battery cells are likely to occur. In order to prevent the occurrence of the above accidents, it is usually necessary to set an explosion-proof valve on the battery pack. When high-temperature and high-pressure gases and molten substances appear in the box body, the explosion-proof valve can connect the inside of the battery box with the outside, so as to discharge the high-temperature and high-pressure gases and molten substances from the battery box.

[0003] The battery cells in the battery box are densely arranged and closely fit on each surface inside the battery box, resulting in poor air permeability of each surface in contact with the battery cells inside the battery box. In particular, the anti-expansion beam inside the battery box is used to withstand the expansion force when the battery cells expand (the main direction of the expansion force is usually the same as the direction in which multiple battery cells are arranged in sequence). The fitting surface on the anti-expansion beam is in direct contact with the battery cells, resulting in poor air permeability of the fitting surface. The air ducts used to communicate with the explosion-proof valve are usually opened on one or more fitting surfaces inside the battery box, resulting in poor connectivity between the explosion-proof valve and the outside of the battery box (the discharge performance of high-temperature and high-pressure gases and molten substances is also poor). Sticking or blocking problems often occur under the working conditions where the explosion-proof valve needs to be opened, which in turn leads to poor safety of the battery pack. Summary of the Utility Model

[0004] The utility model provides a battery box, a battery pack and an electrical equipment to solve the problem of poor connectivity between the explosion-proof valve on the battery box and the outside in the prior art.

[0005] To solve the above problems, according to one aspect of the present utility model, a battery box is provided, including: a box body structure having an accommodation cavity inside for accommodating battery cells; the accommodation cavity has a first fitting surface that abuts and cooperates with the battery cells, and the first fitting surface has ventilation holes; a load-bearing beam fixedly arranged in the accommodation cavity for supporting the box body structure; one end of the load-bearing beam along its extending direction is the first end, and the first end faces the first fitting surface; an explosion-proof pressure stabilizing valve, which is arranged outside the accommodation cavity and communicated with the ventilation holes; wherein, the box body structure includes a box body frame and a bottom guard plate arranged on the box body frame; projecting the first end along the extending direction of the load-bearing beam onto the first fitting surface forms a first projection, and at least a part of the ventilation holes is located within the first projection and communicated with the accommodation cavity.

[0006] Further, the first end is spaced from the first fitting surface so that the ventilation holes are communicated with the spaced space between the first end and the first fitting surface; alternatively, the load-bearing beam has a ventilation channel, and both ends of the ventilation channel are respectively communicated with the ventilation holes and the accommodation cavity.

[0007] Further, the battery box further includes a gas guiding structure that passes through the ventilation holes, and the explosion-proof pressure stabilizing valve is arranged at one end of the gas guiding structure; the gas guiding structure has a flow channel inside, and the flow channel is respectively communicated with the accommodation cavity and the explosion-proof pressure stabilizing valve.

[0008] Further, the end of the gas guiding structure located in the accommodation cavity is connected to the first end to support the load-bearing beam; the gas guiding structure is in limit cooperation with the inner wall of the ventilation holes; wherein, projecting the end of the gas guiding structure located in the accommodation cavity along the extending direction of the load-bearing beam onto the first fitting surface forms a second projection, and the second projection coincides with or is located within the first projection.

[0009] Further, the first end of the load-bearing beam has a cavity inside, and the end of the gas guiding structure located in the accommodation cavity extends into the cavity; the battery box further includes a connecting piece that is respectively connected to the gas guiding structure and the load-bearing beam.

[0010] Further, the first end further has a stepped first through hole; the gas guiding structure has a second through hole, and the first through hole and the second through hole are correspondingly communicated; one end of the connecting piece passes through the first through hole and cooperates with the inner wall of the second through hole; the other end of the connecting piece is located within the first through hole and abuts and cooperates with the stepped surface within the first through hole.

[0011] Further, there are a plurality of first through holes on the first end, and the first through holes communicate with the cavity; one end of the air guiding structure located in the accommodating cavity has a plurality of second through holes, and the plurality of first through holes communicate with the plurality of second through holes in a one-to-one correspondence; there are a plurality of connecting pieces, and the plurality of connecting pieces are in one-to-one correspondence and cooperate with the plurality of first through holes; one end of a connecting piece passes through a first through hole and cooperates with the inner wall of a second through hole; wherein, the central axes of the connecting pieces are respectively perpendicular to the direction of gravity and the extending direction of the bearing beam; the central axes of the first through holes, the second through holes and the connecting pieces are collinear.

[0012] Further, the air guiding structure is a hollow beam structure, and there are a plurality of spaced-apart hollow spaces inside the hollow beam structure, and the plurality of hollow spaces are independently arranged or at least a part of the plurality of hollow spaces are communicated; wherein, under the condition that at least a part of the plurality of hollow spaces are communicated, the hollow space closest to the flow channel communicates with the flow channel.

[0013] Further, the air guiding structure further has at least one auxiliary flow hole, and both ends of the auxiliary flow hole communicate with the flow channel and the accommodating cavity respectively; wherein, taking the orientation of the opening where the flow channel communicates with the accommodating cavity as the first direction and the axial direction of the auxiliary flow hole as the second direction, the first direction and the second direction have an included angle.

[0014] Further, the battery box further includes a first fastener, one end of the first fastener passes through the explosion-proof pressure stabilizing valve and is connected to the box body structure, and the first fastener is used to fixedly arrange the explosion-proof pressure stabilizing valve outside the box body structure.

[0015] Further, the battery box further includes a second fastener, one end of the second fastener sequentially passes through the explosion-proof pressure stabilizing valve and the first joint surface and is connected to the first end of the bearing beam, and the second fastener is used to fixedly arrange the explosion-proof pressure stabilizing valve and the first end on the box body structure; wherein, taking the end of the second fastener located in the accommodating cavity and projecting towards the first joint surface along the extending direction of the bearing beam, a third projection is formed, and the third projection is located within the first projection.

[0016] Further, the battery box further includes a third fastener, one end of the third fastener is connected to the first joint surface, and the other end is connected to the first end of the bearing beam, and the third fastener is used to fixedly arrange the first end in the accommodating cavity; wherein, taking the third fastener and projecting towards the first joint surface along the extending direction of the bearing beam, a fourth projection is formed, and the fourth projection is located within the first projection.

[0017] Further, the battery box further includes a sealing ring, the explosion-proof pressure stabilizing valve has a sealing installation groove, at least a part of the sealing ring is arranged in the sealing installation groove and is in limit cooperation with the inner wall of the sealing installation groove; wherein, the sealing ring and the surface of the explosion-proof pressure stabilizing valve with the sealing installation groove are respectively abutted against the outside of the box body structure to jointly seal the air permeation hole.

[0018] Further, the battery box further includes at least one bearing slot and at least one anti-expansion beam; the bearing slot is fixed on the inner wall of the accommodation cavity and is connected to one end of an anti-expansion beam to bear the anti-expansion beam; the anti-expansion beam has a second fitting surface that abuts and cooperates with the battery cell.

[0019] Further, the bearing slot includes a slot base body and a slot flange provided on the slot base body; the slot base body is connected to one end of an anti-expansion beam; the slot flange is fixed on the inner wall of the accommodation cavity; wherein, the slot base body is detachably connected to one end of the anti-expansion beam by means of threaded connection or riveting.

[0020] Further, there are multiple anti-expansion beams, including a first beam and a second beam. The extending direction of the first beam is parallel to the extending direction of the second beam and perpendicular to the extending direction of the bearing beam; the first beam is connected to the second end of the bearing beam far from the first end to bear the second end.

[0021] Further, the battery box further includes a cross connection structure. The cross connection structure is arranged at the intersection position of the bearing beam and the second beam and is respectively connected to the parts of the second beam on both sides of the intersection position and the parts of the bearing beam on both sides of the intersection position, so that the second beam bears the bearing beam; wherein, the cross connection structure is arranged to avoid the second fitting surface.

[0022] Further, the part of the box body structure with the first fitting surface is made of steel material or aluminum alloy material, and the other parts are made of steel material; the bearing beam is made of aluminum alloy material; and / or, the battery box further includes at least one anti-expansion beam, the anti-expansion beam has a second fitting surface that abuts and cooperates with the battery cell, and the anti-expansion beam is made of aluminum alloy material.

[0023] Further, the box body structure further includes a rear beam. The rear beam is fixedly arranged on the box body frame, and the space surrounded by the two together forms an accommodation cavity; the first fitting surface is located on the rear beam; the explosion-proof pressure stabilizing valve is arranged on the surface of the rear beam facing away from the accommodation cavity; the rear beam and the box body frame are made of roll-pressed steel and / or stamping steel.

[0024] According to another aspect of the present invention, there is provided a battery pack. The battery pack includes the above-mentioned battery box. The battery pack further includes a plurality of battery cells. The plurality of battery cells are arranged in rows and columns in the accommodation cavity and are in limit cooperation with the inner wall of the accommodation cavity; the bottom guard plate bears the plurality of battery cells; wherein, a part of the battery cells abuts and cooperates with the first fitting surface.

[0025] Further, the first fitting surface is perpendicular to the row arrangement direction of the plurality of battery cells, and the extending direction of the bearing beam is parallel to the row arrangement direction of the plurality of battery cells; or, the first fitting surface is perpendicular to the column arrangement direction of the plurality of battery cells, and the extending direction of the bearing beam is parallel to the column arrangement direction of the plurality of battery cells.

[0026] According to another aspect of the present invention, there is provided an electrical equipment, and the electrical equipment includes the above-mentioned battery pack.

[0027] Further, the electrical device further includes a mobile frame, and the battery box further includes a hanging beam. The hanging beam is disposed outside the box body structure and fixedly connected to the box body structure; the hanging beam is connected to the mobile frame to fix the battery pack on the mobile frame.

[0028] Further, the mobile frame has a head and a tail. The battery cell has mutually perpendicular length, height, and width directions. The height direction of the battery cell is parallel to the gravity direction, the width direction of the battery cell is parallel to the row arrangement direction of multiple battery cells, and the length direction of the battery cell is parallel to the column arrangement direction of multiple battery cells; wherein, the number of rows of multiple battery cells arranged is greater than the number of columns, the row arrangement direction of multiple battery cells points from the head to the tail; the first fitting surface is located at the tail position.

[0029] Applying the technical solution of the present utility model, the present utility model provides a battery box, including: a box body structure having an accommodation cavity for accommodating battery cells inside; the accommodation cavity has a first fitting surface that abuts and cooperates with the battery cells, and the first fitting surface has ventilation holes; a bearing beam fixedly disposed in the accommodation cavity for supporting the box body structure; one end of the bearing beam along its extending direction is a first end, and the first end faces the first fitting surface; an explosion-proof pressure stabilizing valve, the explosion-proof pressure stabilizing valve is disposed outside the accommodation cavity and communicated with the ventilation holes; wherein, the box body structure includes a box body frame and a bottom guard plate disposed on the box body frame; projecting the first end along the extending direction of the bearing beam onto the first fitting surface to form a first projection, at least a part of the ventilation holes is located within the first projection and communicated with the accommodation cavity.

[0030] By setting at least a part of the ventilation holes within the first projection, the present utility model ensures that at least a part of the ventilation holes is not blocked by the battery cells attached to the first fitting surface, guarantees the reliable communication between the ventilation holes and the accommodation cavity, improves the air permeability of the first fitting surface, and further improves the connectivity between the explosion-proof pressure stabilizing valve and the outside of the battery box, enabling the high-temperature and high-pressure gas and molten matter generated in the accommodation cavity to be discharged smoothly, and the outside gas can also enter the accommodation cavity smoothly to balance the air pressure; in the working conditions where the explosion-proof pressure relief valve needs to be opened, the problems of jamming or blockage are avoided, providing a structural support for improving the safety of the battery pack subsequently; the present utility model creatively designs the relative position relationship between the ventilation holes and the bearing beam, with a simple structure and reliable exhaust, which is convenient for the installation of the explosion-proof pressure relief valve and ensures the rationality of the fluid flow in the accommodation cavity. Description of the Drawings

[0031] The specification drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0032] Figure 1Shows a partial structural schematic diagram of a battery box provided by an embodiment of the present utility model;

[0033] Figure 2 Shows Figure 1 A partial enlarged schematic diagram at position A in ;

[0034] Figure 3 Shows Figure 1 A partial enlarged view of part of the structure at position A in after assembling the air guiding structure;

[0035] Figure 4 Shows an internal structural schematic diagram of the battery box provided by an embodiment of the present utility model from a side view angle;

[0036] Figure 5 Shows Figure 4 A partial enlarged schematic diagram at position B in ;

[0037] Figure 6 Shows a three - dimensional structural schematic diagram of the air guiding structure and the explosion - proof pressure - stabilizing valve provided by an embodiment of the present utility model;

[0038] Figure 7 Shows an internal structural schematic diagram of the air guiding structure and the explosion - proof pressure - stabilizing valve provided by an embodiment of the present utility model;

[0039] Figure 8 Shows an external structural schematic diagram of the box body frame and the rear beam provided by an embodiment of the present utility model;

[0040] Figure 9 Shows Figure 8 A partial enlarged schematic diagram at position C in ;

[0041] Figure 10 Shows a specific structural schematic diagram of the battery pack provided by an embodiment of the present utility model;

[0042] Figure 11 Shows Figure 10 A partial enlarged schematic diagram at position D in ;

[0043] Figure 12 Shows a partial structural schematic diagram of the battery pack provided by an embodiment of the present utility model;

[0044] Figure 13 Shows Figure 12 A partial enlarged schematic diagram at position E in .

[0045] Among them, the above - mentioned drawings include the following reference numerals:

[0046] 10. Box body structure; 11. Accommodating cavity; 12. First fitting surface; 13. Ventilation hole; 14. Box body frame; 15. Rear beam; 151. Protection space; 16. Front beam; 17. Side beam;

[0047] 20. Bearing beam; 21. First end; 22. Second end; 23. First through-hole;

[0048] 30. Explosion-proof pressure stabilizing valve; 31. Sealed installation groove;

[0049] 40. Gas guiding structure; 41. Flow passage; 42. Second through-hole; 43. Hollow space; 44. Auxiliary flow hole;

[0050] 50. Connector;

[0051] 60. First fastener;

[0052] 70. Sealing ring;

[0053] 80. Bearing card slot; 81. Slot base; 82. Slot folded edge;

[0054] 90. Anti-expansion beam; 91. Second fitting surface; 92. First beam; 93. Second beam;

[0055] 100. Cross connection structure;

[0056] 110. Battery cell;

[0057] 120. Mounting beam. Detailed implementation manners

[0058] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0059] Such as Figures 1 to 13As shown in the figure, an embodiment of the present utility model provides a battery box, including: a box body structure 10 with a receiving cavity 11 inside for receiving battery cells 110; the receiving cavity 11 has a first fitting surface 12 that abuts and cooperates with the battery cells 110, and the first fitting surface 12 is provided with ventilation holes 13; a bearing beam 20 fixedly arranged in the receiving cavity 11 for supporting the box body structure 10; one end of the bearing beam 20 along its extending direction is the first end 21, and the first end 21 faces the first fitting surface 12; an explosion-proof pressure stabilizing valve 30, which is arranged outside the receiving cavity 11 and is communicated with the ventilation holes 13; wherein, the box body structure 10 includes a box body frame 14 and a bottom guard plate arranged on the box body frame 14; project the first end 21 along the extending direction of the bearing beam 20 onto the first fitting surface 12 to form a first projection, at least a part of the ventilation holes 13 is located within the first projection and is communicated with the receiving cavity 11.

[0060] In the present utility model, by arranging at least a part of the ventilation holes 13 within the first projection and communicating with the spaced space between the first end 21 and the first fitting surface 12, at least a part of the ventilation holes 13 is not blocked by the battery cells 110 attached to the first fitting surface 12, ensuring the reliable communication between the ventilation holes 13 and the receiving cavity 11, improving the air permeability of the first fitting surface 12, and further improving the connectivity between the explosion-proof pressure stabilizing valve 30 and the outside of the battery box, so that the high-temperature and high-pressure gas and molten matter generated in the receiving cavity 11 can be discharged smoothly, and the outside gas can also enter the receiving cavity 11 smoothly to balance the air pressure; in the working condition where the explosion-proof pressure relief valve needs to be opened, the problems of jamming or blockage are avoided, providing structural support for improving the safety of the battery pack in the future; the present utility model creatively designs the relative position relationship between the ventilation holes 13 and the bearing beam 20, with a simple structure and reliable exhaust, which is convenient for the installation of the explosion-proof pressure relief valve and ensures the rationality of the fluid flow in the receiving cavity 11.

[0061] Specifically, the first end 21 and the first fitting surface 12 are spaced apart to enable the ventilation holes 13 to communicate with the spaced space between the first end 21 and the first fitting surface 12; alternatively, the bearing beam 20 is provided with a ventilation channel, and both ends of the ventilation channel are respectively communicated with the ventilation holes 13 and the receiving cavity 11. Such a setting enables the ventilation holes 13 to be directly or indirectly communicated with the receiving cavity 11, ensuring the air permeability of the ventilation holes 13.

[0062] As Figure 1 、 Figure 2 and Figure 3 shown, the battery box further includes a gas guiding structure 40, the gas guiding structure 40 passes through the ventilation holes 13, and the explosion-proof pressure stabilizing valve 30 is arranged at one end of the gas guiding structure 40; the gas guiding structure 40 has a flow channel 41 inside, and the flow channel 41 is respectively communicated with the receiving cavity 11 and the explosion-proof pressure stabilizing valve 30.

[0063] By providing a flow passage 41 inside the air guiding structure 40, the reliable connection between the accommodation chamber 11 and the explosion-proof pressure stabilizing valve 30 is further ensured.

[0064] It should be noted that in a specific embodiment of the present invention, the accommodation chamber 11 includes a pressure relief passage for the flow of the ejecta inside the box structure 10, so that the ejecta generated by the battery cell 110 located inside the battery box can flow out of the accommodation chamber 11 in time, further ensuring safety.

[0065] As Figure 1 、 Figure 2 and Figure 3 shown, one end of the air guiding structure 40 located inside the accommodation chamber 11 is connected to the first end 21 to support the load-bearing beam 20; the air guiding structure 40 is in limit fit with the inner wall of the air vent hole 13; wherein, the projection of one end of the air guiding structure 40 located inside the accommodation chamber 11 along the extension direction of the load-bearing beam 20 onto the first fitting surface 12 forms a second projection, and the second projection coincides with or is located within the first projection.

[0066] By providing the connection between one end of the air guiding structure 40 located inside the accommodation chamber 11 and the first end 21 of the load-bearing beam 20, reliable support for the load-bearing beam 20 is achieved, thereby ensuring the stability and firmness of the load-bearing beam 20; by providing the second projection to coincide with or be located within the first projection, one end of the air guiding structure 40 located inside the accommodation chamber 11 does not directly contact the battery cell 110, achieving avoidance of the battery cell 110.

[0067] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 shown, the first end 21 of the load-bearing beam 20 has a cavity inside, and one end of the air guiding structure 40 located inside the accommodation chamber 11 extends into the cavity; the battery box further includes a connecting member 50, and the connecting member 50 is respectively connected to the air guiding structure 40 and the load-bearing beam 20.

[0068] By providing the connection of the connecting member 50 to the air guiding structure 40 and the load-bearing beam 20 respectively, the connection strength between the air guiding structure 40 and the cavity is further improved.

[0069] In a specific embodiment of the present invention, the connecting member 50 is a rivet or a screw, which is convenient for installation and cost control.

[0070] Optionally, the first end 21 further has a stepped first through hole 23; the air guiding structure 40 has a second through hole 42, and the first through hole 23 and the second through hole 42 are correspondingly connected; one end of the connecting member 50 passes through the first through hole 23 and is in fit with the inner wall of the second through hole 42; the other end of the connecting member 50 is located inside the first through hole 23 and is in abutting fit with the stepped surface inside the first through hole 23.

[0071] By setting the first through-hole 23 as a stepped hole, reliable accommodation of the other end of the connecting member 50 is achieved, thereby ensuring the smoothness and flatness of the side wall of the first end 21, which is convenient for subsequent close cooperation with the battery cell 110.

[0072] As Figure 4 , Figure 5 , Figure 6 and Figure 7 shown, the first end 21 further has a plurality of first through-holes 23, and the first through-holes 23 communicate with the cavity; one end of the air guiding structure 40 located in the accommodating cavity 11 has a plurality of second through-holes 42, and the plurality of first through-holes 23 communicate with the plurality of second through-holes 42 in a one-to-one correspondence; there are a plurality of connecting members 50, and the plurality of connecting members 50 are in one-to-one correspondence with the plurality of first through-holes 23; one end of a connecting member 50 passes through a first through-hole 23 and cooperates with the inner wall of a second through-hole 42; wherein, the central axis of the connecting member 50 is perpendicular to the direction of gravity and the extending direction of the bearing beam 20 respectively; the central axes of the first through-hole 23, the second through-hole 42 and the connecting member 50 are collinear.

[0073] With such a setting, both the connection strength between the air guiding structure 40 and the first end 21 is ensured, and the plurality of connecting members 50 can reliably support the bearing beam 20, and the deformation of the bearing beam 20 in the direction of gravity is reduced, maximizing the connection strength.

[0074] As Figure 4 , Figure 5 , Figure 6 and Figure 7 shown, the air guiding structure 40 is a hollow beam structure, and the interior of the hollow beam structure has a plurality of spaced-apart hollow spaces 43, and the plurality of hollow spaces 43 are independently arranged or at least a part of the plurality of hollow spaces 43 are communicated; wherein, under the condition that at least a part of the plurality of hollow spaces 43 are communicated, the hollow space 43 closest to the flow channel 41 communicates with the flow channel 41.

[0075] By setting the air guiding structure 40 as a hollow beam structure, the light weight of the air guiding structure 40 is ensured; by setting at least a part of the plurality of hollow spaces 43 to be communicated, the effective flow area between the flow channel 41 and the accommodating cavity 11 is larger, further improving the connectivity with the outside of the battery box;

[0076] As Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, the air guiding structure 40 further has at least one auxiliary flow hole 44. Both ends of the auxiliary flow hole 44 are respectively communicated with the flow channel 41 and the accommodation cavity 11. Wherein, taking the orientation of the opening where the flow channel 41 is communicated with the accommodation cavity 11 as the first direction, and taking the axial direction of the auxiliary flow hole 44 as the second direction, there is an included angle between the first direction and the second direction.

[0077] By providing the auxiliary flow hole 44, the effective flow area between the flow channel 41 and the accommodation cavity 11 is further increased. By providing an included angle between the first direction and the second direction, the fluid in the accommodation cavity 11 can flow into the flow channel 41 from multiple angles, so that the high-temperature and high-pressure gas and melt generated in the accommodation cavity 11 can be discharged smoothly.

[0078] In a specific embodiment of the present utility model, the included angle between the first direction and the second direction is a right angle, which is convenient for the precise positioning and processing of the auxiliary flow hole 44.

[0079] As Figure 1 、 Figure 2 and Figure 5 As shown, the battery box further includes a first fastener 60. One end of the first fastener 60 passes through the explosion-proof pressure stabilizing valve 30 and is connected to the box body structure 10. The first fastener 60 is used to fixedly arrange the explosion-proof pressure stabilizing valve 30 outside the box body structure 10.

[0080] By providing the first fastener 60, the explosion-proof pressure stabilizing valve 30 is firmly fixed outside the box body structure 10.

[0081] It should be noted that: In a specific embodiment of the present utility model, as Figure 5 shown, the battery box further includes a sealed rivet nut, and the sealed rivet nut is arranged in the accommodation cavity 11. The first fastener 60 is a fastening screw, and a sealed rivet nut is in threaded cooperation with a fastening screw to fix the fastening screw. Wherein, taking the projection of the sealed rivet nut along the extension direction of the bearing beam 20 onto the first joint surface 12 to form a fifth projection, and the fifth projection is located within the first projection.

[0082] Optionally, the battery box further includes a second fastener. One end of the second fastener passes through the explosion-proof pressure stabilizing valve 30 and the first joint surface 12 in sequence and is connected to the first end 21 of the bearing beam 20. The second fastener is used to fixedly arrange the explosion-proof pressure stabilizing valve 30 and the first end 21 on the box body structure 10. Wherein, taking the projection of the end of the second fastener located in the accommodation cavity 11 along the extension direction of the bearing beam 20 onto the first joint surface 12 to form a third projection, and the third projection is located within the first projection.

[0083] By setting the second fastener, the firm fixation of the explosion-proof pressure stabilizing valve 30 is achieved, and the reliable fixation of the first end 21 on the box structure 10 is also achieved; by setting the third projection within the first projection, the second fastener does not directly contact the battery cell 110, realizing the avoidance of the battery cell 110.

[0084] It should be noted that: in a specific embodiment of the present utility model, the second fastener is a connecting screw, and the threaded end of the connecting screw sequentially passes through the explosion-proof pressure stabilizing valve 30 and the first fitting surface 12, and is in threaded cooperation with the first end 21 of the bearing beam 20.

[0085] Optionally, the battery box further includes a third fastener. One end of the third fastener is connected to the first fitting surface 12, and the other end is connected to the first end 21 of the bearing beam 20. The third fastener is used to fixedly arrange the first end 21 in the accommodation cavity 11; wherein, when the third fastener projects towards the first fitting surface 12 along the extending direction of the bearing beam 20, a fourth projection is formed, and the fourth projection is located within the first projection.

[0086] By setting the third fastener, the reliable fixation of the first end 21 on the box structure 10 is achieved, and the third fastener does not directly contact the battery cell 110, realizing the avoidance of the battery cell 110.

[0087] It is worth noting that, according to actual requirements for the fixation of the explosion-proof pressure stabilizing valve 30, the fixation and support strength requirements of the first end 21 on the box structure 10, and space limitations within the accommodation cavity 11 and other factors, one or more of the above-mentioned first fastener 60, second fastener, and third fastener can be comprehensively considered and selected for use.

[0088] As Figure 1 、 Figure 2 、 Figure 5 and Figure 6 shown, the battery box further includes a sealing ring 70. The explosion-proof pressure stabilizing valve 30 has a sealing installation groove 31. At least a part of the sealing ring 70 is arranged in the sealing installation groove 31 and is in limit cooperation with the inner wall of the sealing installation groove 31; wherein, the sealing ring 70 and the surface of the explosion-proof pressure stabilizing valve 30 having the sealing installation groove 31 are respectively in contact with the outside of the box structure 10 to jointly seal the air vent 13.

[0089] By setting the sealing ring 70 to cooperate with the inner wall of the sealing installation groove 31, the reliable sealing of the air vent 13 is achieved.

[0090] As Figure 1 、 Figure 8 and Figure 9As shown, the battery box further includes at least one load-bearing slot 80 and at least one anti-expansion beam 90; the load-bearing slot 80 is fixed on the inner wall of the accommodation cavity 11 and is connected to one end of an anti-expansion beam 90 to support the anti-expansion beam 90; the anti-expansion beam 90 has a second fitting surface 91 that abuts and cooperates with the battery cell 110, and the second fitting surface 91 is a flat surface.

[0091] By providing the load-bearing slot 80, reliable fixation of the anti-expansion beam 90 is achieved; by providing the second fitting surface 91 as a flat surface, reliable restraint of the battery cell 110 is achieved, and it is more convenient for the anti-expansion beam 90 to uniformly bear the expansion force of the battery cell.

[0092] As Figure 8 and Figure 9 shown, the load-bearing slot 80 includes a slot base body 81 and a slot flange 82 provided on the slot base body 81. The slot base body 81 is connected to one end of an anti-expansion beam 90; the slot flange 82 is fixed to the inner wall of the accommodation cavity 11 by welding; wherein, the slot base body 81 is detachably connected to one end of the anti-expansion beam 90 by threaded connection or riveting.

[0093] By providing the slot flange 82, it is convenient for the load-bearing slot 80 to be fixed to the inner wall of the accommodation cavity 11 by welding, and the connection strength after welding is ensured to meet the actual use requirements.

[0094] As Figure 1 shown, there are multiple anti-expansion beams 90, including a first beam 92 and a second beam 93. The extending direction of the first beam 92 is parallel to the extending direction of the second beam 93 and is perpendicular to the extending direction of the load-bearing beam 20; the first beam 92 is connected to the second end 22 of the load-bearing beam 20 far from the first end 21 to support the second end 22.

[0095] With this arrangement, the first beam 92, the second beam 93, and the load-bearing beam 20 together form a cross-shaped structure, thereby ensuring reliable limiting and support for the battery cell 110.

[0096] In a specific embodiment of the present invention, as Figure 1 shown, the load-bearing beam 20 passes through the second beam 93 to ensure the integrity of the load-bearing beam 20.

[0097] As Figure 1 and Figure 10 shown, the battery box further includes a cross-connection structure 100. The cross-connection structure 100 is provided at the intersection of the load-bearing beam 20 and the second beam 93 and is respectively connected to the parts of the second beam 93 on both sides of the intersection and the parts of the load-bearing beam 20 on both sides of the intersection, so that the second beam 93 bears the load-bearing beam 20; wherein, the cross-connection structure 100 is arranged to avoid the second fitting surface 91.

[0098] By setting the cross-connection structure 100, the smoothness and integrity of the force conduction between the second beam 93 and the load-bearing beam 20 are ensured; by setting the cross-connection structure 100 to avoid the second fitting surface 91, the second fitting surface 91 is made flat and smooth, which is convenient for subsequent close fitting with the battery cell 110.

[0099] Optionally, the part of the box structure 10 with the first fitting surface 12 is made of steel material or aluminum alloy material, and the other parts are made of steel material; the load-bearing beam 20 is made of aluminum alloy material; and / or, the battery box further includes at least one anti-expansion beam 90, the anti-expansion beam 90 has a second fitting surface 91 that abuts and cooperates with the battery cell 110, and the anti-expansion beam 90 is made of aluminum alloy material.

[0100] By setting the mixed use of steel material and aluminum material, compared with the battery box made of all-aluminum material, the cost is reduced, and a balance is achieved among the requirements of overall strength, stiffness and weight.

[0101] As Figure 1 、 Figure 8 and Figure 13 shown, the box structure 10 further includes a rear beam 15, the rear beam 15 is fixedly arranged on the box frame 14, and the space surrounded by the two together forms a receiving cavity 11; the first fitting surface 12 is located on the rear beam 15; the explosion-proof pressure stabilizing valve 30 is arranged on the side of the rear beam 15 facing away from the receiving cavity 11; the rear beam 15 and the box frame 14 are made of roll-pressed steel and / or stamping steel.

[0102] Such a setting not only ensures the simplicity of the box structure 10, which is convenient for subsequent processing, but also effectively reduces the production cost.

[0103] The rear beam 15 in the present utility model should not only resist the expansion force generated during the expansion of the battery cell 110, but also ensure a reliable sealing interface for the bottom guard plate (i.e., the bottom plate below the battery pack) and the box cover (i.e., the cover plate above the battery pack) of the battery pack throughout the life cycle. Therefore, the strength of the rear beam 15 needs to be strong enough to ensure small displacement and the sealing surface is not affected by the force when resisting the expansion force.

[0104] It should be noted that: as Figure 5 and Figure 13 shown, the rear beam 15 forms a protection space 151 outside the receiving cavity 11 through bending processing, and the explosion-proof pressure stabilizing valve 30 is arranged in the protection space 151 to prevent external impact from directly acting on the explosion-proof pressure stabilizing valve 30; by setting the protection space 151, the protection of the explosion-proof pressure stabilizing valve 30 is realized.

[0105] In addition, it should be elaborated in detail that in a specific embodiment of the present utility model, some materials, structural designs, and processing technologies with relatively low costs can be considered for processing other parts of the battery box (such as structures other than the box body frame 14, the rear beam 15, and the anti-expansion beam 90) to achieve the effect of cost reduction on the premise of meeting the requirements of strength and stiffness. The following are some selectable technical solutions: 1. Use high-strength plastics or polymer matrix composite materials. These materials have relatively low density, good stiffness and strength, and also have good corrosion resistance and processing performance. Commonly used high-strength plastics include polycarbonate (PC), polyetheretherketone (PEEK), etc., and commonly used polymer matrix composite materials include carbon fiber reinforced plastics (CFRP), etc.; 2. Design optimization in terms of structure: When designing the battery box body, the utilization rate of materials can be improved and the cost can be reduced through optimizing the structural design. For example, honeycomb structures, grid structures, or laminated structures can be adopted to improve the stiffness and strength while reducing the material usage; 3. Optimization of manufacturing processes: Use manufacturing processes with relatively low costs, such as injection molding, compression molding, or hot pressing, etc. These processes can reduce the production cost while maintaining a relatively high production efficiency; 4. Optimization of connection processes: In the assembly process of the battery box body, connection technologies with relatively low costs can be considered, such as bonding, riveting, or welding, etc. These connection technologies can reduce the connection cost while ensuring the strength and stiffness of the box body; 5. Composite use with other materials: It can be considered to composite high-strength plastics or polymer matrix composite materials with other low-cost materials (such as glass fiber reinforced plastics, carbon fiber reinforced thermoplastics, etc.) to further improve the performance of the battery pack box body and reduce the cost. Through the above measures, the cost can be reduced on the premise of meeting the requirements of strength and stiffness of the battery box body.

[0106] As Figure 10 , Figure 11 and Figure 12 shown, the present utility model further provides a battery pack. The battery pack includes the above-mentioned battery box. The battery pack further includes a plurality of battery cells 110. The plurality of battery cells 110 are arranged in rows and columns in the accommodation cavity 11 and are in limit cooperation with the inner wall of the accommodation cavity 11; the bottom guard plate bears the plurality of battery cells 110; wherein, a part of the battery cells 110 are in abutting cooperation with the first fitting surface 12.

[0107] The battery pack proposed by the present utility model has high safety. The high-temperature and high-pressure gas and molten substances generated in the accommodation cavity 11 can be discharged smoothly, and external gas can also enter the accommodation cavity 11 smoothly to balance the air pressure.

[0108] As Figure 10 , Figure 11 and Figure 12As shown, the first bonding surface 12 is perpendicular to the row arrangement direction of the plurality of battery cells 110, and the extending direction of the load-bearing beam 20 is parallel to the row arrangement direction of the plurality of battery cells 110; alternatively, the first bonding surface 12 is perpendicular to the column arrangement direction of the plurality of battery cells 110, and the extending direction of the load-bearing beam 20 is parallel to the column arrangement direction of the plurality of battery cells 110.

[0109] This setting ensures reliable load-bearing of the expansion force of the battery cells.

[0110] The present utility model further provides an electrical device, which includes the above-mentioned battery pack.

[0111] As Figure 10 、 Figure 11 and Figure 12 shown, the electrical device further includes a mobile vehicle frame, and the battery box further includes a mounting beam 120. The mounting beam 120 is arranged outside the box structure 10 and is fixedly connected to the box structure 10; the mounting beam 120 is detachably connected to the mobile vehicle frame to fix the battery pack on the mobile vehicle frame; the mobile vehicle frame has a head and a tail, the battery cells 110 have mutually perpendicular length, height and width directions, the height direction of the battery cells 110 is parallel to the gravity direction, the width direction of the battery cells 110 is parallel to the row arrangement direction of the plurality of battery cells 110, and the length direction of the battery cells 110 is parallel to the column arrangement direction of the plurality of battery cells 110; wherein, the number of rows of the plurality of battery cells 110 arranged is greater than the number of columns, and the row arrangement direction of the plurality of battery cells 110 points from the head to the tail; the first bonding surface 12 is located at the tail position.

[0112] By setting the number of rows of the plurality of battery cells 110 arranged to be greater than the number of columns, and the row arrangement direction of the plurality of battery cells 110 points from the head to the tail, the extending direction of the load-bearing beam 20 is parallel to the main direction of the expansion force of the battery cells, and the first bonding surface 12 is perpendicular to the main direction of the expansion force of the battery cells, further ensuring reliable load-bearing of the overall battery box for the expansion force of the battery cells; by setting the first bonding surface 12 at the tail position, the explosion-proof pressure stabilizing valve 30 is also located at a relatively safe position at the tail, avoiding the simultaneous collision accident of the explosion-proof pressure stabilizing valve 30 and the head, and ensuring safety.

[0113] It should be noted that: In a specific embodiment of the present utility model, the process of processing and forming by roll pressing and stamping steel usually includes the following steps: 1. Material selection: Select steel suitable for the battery box, usually high-strength and corrosion-resistant steel plates, such as galvanized steel plates, stainless steel plates, etc.; 2. Design drawings: Design corresponding processing drawings and molds according to the size, shape and performance requirements of the battery box; 3. Cutting: Cut the steel plate into the required size and shape according to the design drawings. The cutting methods include laser cutting, plasma cutting, flame cutting, etc.; 4. Roll pressing: Perform roll pressing on the cut steel plate to form a preliminary shape of the battery box. During the roll pressing process, the steel plate gradually deforms under the pressure of a series of rollers to form the required shape; 5. Stamping: Perform stamping on the roll-pressed steel plate to form the complex structure and details of the battery pack box. During the stamping process, the steel plate is locally deformed under the guidance of the mold through the punch of the press to form the required structure and features; 6. Welding: Weld the stamped components to form a complete battery box. The welding methods include laser welding, argon arc welding, arc welding, etc. Select a suitable welding method according to the material and structure requirements; 7. Surface treatment: Perform surface treatment on the welded battery box to improve its corrosion resistance and aesthetics. The surface treatment methods include sandblasting, phosphating, electrophoretic coating, powder spraying, etc.; 8. Quality inspection: Perform quality inspection on the processed and formed battery box to ensure that its size, shape, performance, etc. meet the design requirements; 9. Assembly: Assemble the processed and formed battery box with other battery components to form a complete battery pack. Through the above steps, the battery pack processed and formed by roll pressing and stamping steel has high strength, good corrosion resistance and structural stability, and can meet the protection and support requirements of electric vehicle battery packs.

[0114] In a specific embodiment of the present utility model, a box frame 14 is formed by roll pressing steel and stamping steel. After the box frame 14 is assembled and formed, electrophoresis treatment is first carried out; as Figure 1 and Figure 8 shown, the box frame 14 includes a front beam 16 and side beams 17; the front beam 16, rear beam 15 and mounting beam 120 are all formed by steel sheet metal stamping, and the side beams 17 are formed by roll pressing steel. A load-bearing card slot 80 is welded and fixed on the side beams 17 to meet the assembly of the aluminum material beam; The battery box proposed by the present utility model is developed and designed by adopting the above-mentioned roll-pressed steel + aluminum profile hybrid scheme, which not only reduces the cost but also meets the weight requirements; during actual processing, high-strength steel plates (for example: 780DP) can be selected, with a thickness range of 1.0 - 2.0 mm. The box frame 14 is made by roll pressing process, and then the roll pressing + stamping process is adopted to realize the overall integration of the box frame 14 and the rear beam 15; the anti-expansion beam 90 adopts aluminum profile; after electrophoresis of the box frame 14, it is assembled to form a battery box, and then battery cells 110, electrical components and other parts are installed to form a complete battery pack.

[0115] In addition, in another specific embodiment of the present utility model, high-strength steel plates can adopt the following materials: 1. High-strength low-alloy steel (HSLA), and this type of steel improves its strength and toughness by adding a small amount of alloying elements (such as manganese, silicon, molybdenum, niobium, vanadium, etc.); HSLA steel has good weldability and workability and is suitable for manufacturing complex battery box structures; 2. Stainless steel, stainless steel contains a relatively high chromium content and has good corrosion resistance, being suitable for use in harsh environments; common types of stainless steel include 304, 316, etc., and their application in battery boxes can improve the durability of products; 3. Duplex stainless steel, duplex stainless steel combines the advantages of austenitic stainless steel and ferritic stainless steel, having higher strength and corrosion resistance and being suitable for manufacturing battery box components that bear relatively large loads; 4. Martensitic stainless steel, martensitic stainless steel can significantly improve its hardness and strength through heat treatment and is suitable for manufacturing battery box components that require relatively high hardness and wear resistance; 5. Ultra-high-strength steel, ultra-high-strength steel has extremely high tensile strength and can withstand extremely large loads. This type of steel is commonly used in manufacturing key components of high-performance products such as airplanes and automobiles and is also applicable to the manufacturing of battery boxes; 6. Alloy steel, alloy steel can adjust its properties by adding different alloying elements to meet the requirements of specific applications; for example, by adding elements such as nickel, chromium, and molybdenum, the strength, toughness, and corrosion resistance of the steel can be improved; 7. Hot-rolled steel plate, hot-rolled steel plate is rolled at high temperatures and has good strength and toughness; hot-rolled steel plates are commonly used in manufacturing the outer shells and other structural components of battery boxes; 8. Cold-rolled steel plate, cold-rolled steel plate is rolled at room temperature and has high dimensional accuracy and surface finish, being suitable for manufacturing precision components of battery boxes. When selecting high-strength steel plate materials, factors such as the specific application scenario of the battery box, mechanical property requirements, processing technology, and cost need to be considered. At the same time, environmental protection factors such as the weldability, corrosion resistance, and recyclability of the materials also need to be considered.

[0116] In summary, the present utility model provides a battery box, a battery pack and an electrical equipment. By arranging at least a part of the ventilation holes 13 within the first projection and communicating with the spaced space between the first end 21 and the first joint surface 12, at least a part of the ventilation holes 13 is not blocked by the battery cells 110 attached to the first joint surface 12, ensuring the reliable communication between the ventilation holes 13 and the accommodation cavity 11, improving the air permeability of the first joint surface 12, and further enhancing the connectivity between the explosion-proof pressure stabilizing valve 30 and the outside of the battery box, enabling the smooth discharge of the high-temperature and high-pressure gas and the molten matter generated within the accommodation cavity 11, and allowing the outside gas to smoothly enter the accommodation cavity 11 to balance the air pressure. In the working conditions where the explosion-proof pressure relief valve needs to be opened, the occurrence of jamming or blockage problems is avoided, providing structural support for improving the safety of the battery pack in the future. The present utility model creatively designs the relative positional relationship between the ventilation holes 13 and the load-bearing beam 20, with a simple structure and reliable exhaust, facilitating the installation of the explosion-proof pressure relief valve and ensuring the rationality of the fluid flow within the accommodation cavity 11. After replacing aluminum with steel in the present utility model, the material cost is reduced, lowering the overall material cost of the battery box body. At the same time, compared with a pure steel box body, the electrophoretic area is reduced, also reducing the cost. The present utility model realizes the connection of multiple internal aluminum beams and the steel material frame by arranging the load-bearing card slots 80; by arranging the ventilation holes 13 and the air guiding structure 40, the installation and reliable pressure relief of the explosion-proof pressure stabilizing valve 30 are satisfied.

[0117] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or their combinations.

[0118] Unless otherwise specifically stated, the relative arrangements of the components and steps set forth in these embodiments, the numerical expressions and values do not limit the scope of the present utility model. At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0119] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0120] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0121] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without additional declaration, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0122] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery box, characterized in that, Comprising: A box structure (10) having an accommodation cavity (11) inside for accommodating an electric core (110); the accommodation cavity (11) has a first fitting surface (12) that abuts and cooperates with the electric core (110), and ventilation holes (13) are provided on the first fitting surface (12); A bearing beam (20) fixedly arranged in the accommodation cavity (11) for supporting the box structure (10); one end of the bearing beam (20) along its extending direction is a first end (21), and the first end (21) faces the first fitting surface (12); An explosion-proof pressure stabilizing valve (30), the explosion-proof pressure stabilizing valve (30) is arranged outside the accommodation cavity (11) and is communicated with the ventilation holes (13); Wherein, the box structure (10) includes a box frame (14) and a bottom guard plate arranged on the box frame (14); projecting the first end (21) along the extending direction of the bearing beam (20) onto the first fitting surface (12) forms a first projection, and at least a part of the ventilation holes (13) is located within the first projection and is communicated with the accommodation cavity (11).

2. The battery box according to claim 1, characterized in that, The first end (21) is spaced from the first fitting surface (12) so that the ventilation holes (13) are communicated with the spaced space between the first end (21) and the first fitting surface (12); alternatively, the bearing beam (20) has a ventilation channel, and both ends of the ventilation channel are respectively communicated with the ventilation holes (13) and the accommodation cavity (11).

3. The battery box according to claim 2, characterized in that, The battery box further includes a gas guiding structure (40), the gas guiding structure (40) passes through the ventilation holes (13), and the explosion-proof pressure stabilizing valve (30) is arranged at one end of the gas guiding structure (40); a flow channel (41) is provided inside the gas guiding structure (40), and the flow channel (41) is respectively communicated with the accommodation cavity (11) and the explosion-proof pressure stabilizing valve (30).

4. The battery box according to claim 3, characterized in that, One end of the gas guiding structure (40) located in the accommodation cavity (11) is connected to the first end (21) to support the bearing beam (20); the gas guiding structure (40) is in limit cooperation with the inner wall of the ventilation holes (13); wherein, projecting the end of the gas guiding structure (40) located in the accommodation cavity (11) along the extending direction of the bearing beam (20) onto the first fitting surface (12) forms a second projection, and the second projection coincides with or is located within the first projection.

5. The battery box according to claim 4, wherein A cavity is provided inside the first end (21) of the bearing beam (20), and one end of the gas guiding structure (40) located in the accommodation cavity (11) extends into the cavity; the battery box further includes a connecting member (50), and the connecting member (50) is respectively connected to the gas guiding structure (40) and the bearing beam (20).

6. The battery box according to claim 5, characterized in that, The first end (21) further has a stepped first through hole (23); the air guiding structure (40) has a second through hole (42), and the first through hole (23) is correspondingly communicated with the second through hole (42); one end of the connecting piece (50) passes through the first through hole (23) and is matched with the inner wall of the second through hole (42); the other end of the connecting piece (50) is located in the first through hole (23) and is in abutting cooperation with the stepped surface in the first through hole (23).

7. The battery box according to claim 5, characterized in that, The first end (21) further has a plurality of first through holes (23), and the first through holes (23) are communicated with the cavity; one end of the air guiding structure (40) located in the accommodating cavity (11) has a plurality of second through holes (42), and the plurality of first through holes (23) are correspondingly communicated with the plurality of second through holes (42) one by one; there are a plurality of the connecting pieces (50), and the plurality of connecting pieces (50) are correspondingly matched with the plurality of first through holes (23) one by one; one end of one connecting piece (50) passes through one first through hole (23) and is matched with the inner wall of one second through hole (42); wherein, the central axes of the connecting pieces (50) are respectively perpendicular to the direction of gravity and the extending direction of the bearing beam (20); the central axes of the first through holes (23), the central axes of the second through holes (42) and the central axes of the connecting pieces (50) are collinear.

8. The battery box according to any one of claims 3 to 7, characterized in that, The air guiding structure (40) is a hollow beam structure, and the inside of the hollow beam structure has a plurality of spaced-apart hollow spaces (43), and the plurality of hollow spaces (43) are independently arranged or at least a part of the plurality of hollow spaces (43) are communicated; wherein, under the condition that at least a part of the plurality of hollow spaces (43) are communicated, the hollow space (43) closest to the flow passage (41) is communicated with the flow passage (41).

9. The battery box according to claim 3, characterized in that, The air guiding structure (40) further has at least one auxiliary flow hole (44), and both ends of the auxiliary flow hole (44) are respectively communicated with the flow passage (41) and the accommodating cavity (11); wherein, taking the orientation of the opening where the flow passage (41) is communicated with the accommodating cavity (11) as the first direction and the axial direction of the auxiliary flow hole (44) as the second direction, there is an included angle between the first direction and the second direction.

10. The battery box according to claim 1, characterized in that, The battery box further includes a first fastener (60), one end of the first fastener (60) passes through the explosion-proof pressure stabilizing valve (30) and is connected to the box body structure (10), and the first fastener (60) is used for fixedly arranging the explosion-proof pressure stabilizing valve (30) outside the box body structure (10).

11. The battery box according to claim 1, characterized in that, The battery box further includes a second fastener. One end of the second fastener sequentially passes through the explosion-proof pressure stabilizing valve (30) and the first joint surface (12), and is connected to the first end (21) of the bearing beam (20). The second fastener is used to fixedly arrange the explosion-proof pressure stabilizing valve (30) and the first end (21) on the box body structure (10). Wherein, a third projection is formed by projecting the end of the second fastener located in the accommodation cavity (11) along the extending direction of the bearing beam (20) towards the first joint surface (12), and the third projection is located within the first projection.

12. The battery box according to claim 1, characterized in that, The battery box further includes a third fastener. One end of the third fastener is connected to the first joint surface (12), and the other end is connected to the first end (21) of the bearing beam (20). The third fastener is used to fixedly arrange the first end (21) within the accommodation cavity (11). Wherein, a fourth projection is formed by projecting the third fastener along the extending direction of the bearing beam (20) towards the first joint surface (12), and the fourth projection is located within the first projection.

13. The battery box according to claim 1, characterized in that, The battery box further includes a sealing ring (70). The explosion-proof pressure stabilizing valve (30) is provided with a sealing installation groove (31). At least a part of the sealing ring (70) is arranged in the sealing installation groove (31) and is in limit fit with the inner wall of the sealing installation groove (31). Wherein, the sealing ring (70) and the surface of the explosion-proof pressure stabilizing valve (30) having the sealing installation groove (31) are respectively abutted against the outside of the box body structure (10) to jointly seal the air vent (13).

14. The battery box according to claim 1, wherein The battery box further includes at least one bearing card slot (80) and at least one anti-expansion beam (90). The bearing card slot (80) is fixed on the inner wall of the accommodation cavity (11) and is connected to one end of an anti-expansion beam (90) to bear the anti-expansion beam (90). The anti-expansion beam (90) has a second joint surface (91) that abuts and cooperates with the battery cell (110).

15. The battery box according to claim 14, wherein, The bearing card slot (80) includes a slot base body (81) and a slot flange (82) arranged on the slot base body (81). The slot base body (81) is connected to one end of an anti-expansion beam (90). The slot flange (82) is fixed on the inner wall of the accommodation cavity (11). Wherein, the slot base body (81) is detachably connected to one end of the anti-expansion beam (90) by means of threaded connection or riveting.

16. The battery box according to claim 14, characterized in that, There are multiple anti-expansion beams (90), including a first beam (92) and a second beam (93). The extending direction of the first beam (92) is parallel to the extending direction of the second beam (93) and is perpendicular to the extending direction of the bearing beam (20). The first beam (92) is connected to the second end (22) of the bearing beam (20) away from the first end (21) to bear the second end (22).

17. The battery box according to claim 16, characterized in that, The battery box further includes a cross-connection structure (100). The cross-connection structure (100) is disposed at the intersection of the bearing beam (20) and the second beam (93), and is respectively connected to the portions of the second beam (93) on both sides of the intersection position and the portions of the bearing beam (20) on both sides of the intersection position, so that the second beam (93) bears the bearing beam (20); wherein, the cross-connection structure (100) is arranged to avoid the second fitting surface (91).

18. The battery box according to claim 1, characterized in that, The part of the box body structure (10) having the first fitting surface (12) is made of steel material or aluminum alloy material, and the other parts are made of steel material; the bearing beam (20) is made of aluminum alloy material; and / or, the battery box further includes at least one anti-expansion beam (90). The anti-expansion beam (90) has a second fitting surface (91) that abuts and cooperates with the battery cell (110), and the anti-expansion beam (90) is made of aluminum alloy material.

19. The battery box according to claim 18, characterized in that, The box body structure (10) further includes a rear beam (15). The rear beam (15) is fixedly arranged on the box body frame (14), and the space surrounded by the two together forms the accommodation cavity (11); the first fitting surface (12) is located on the rear beam (15); the explosion-proof pressure stabilizing valve (30) is arranged on the side of the rear beam (15) facing away from the accommodation cavity (11); the rear beam (15) and the box body frame (14) are made of roll-formed steel and / or stamped steel.

20. A battery pack, characterized in that, The battery pack includes the battery box according to any one of claims 1 to 19. The battery pack further includes a plurality of battery cells (110). The plurality of battery cells (110) are arranged in rows and columns in the accommodation cavity (11) and are in limit cooperation with the inner wall of the accommodation cavity (11); the bottom guard plate bears the plurality of battery cells (110); wherein, a part of the battery cells (110) abuts and cooperates with the first fitting surface (12).

21. According to the battery pack of claim 20, wherein The first fitting surface (12) is perpendicular to the row arrangement direction of the plurality of battery cells (110), and the extending direction of the bearing beam (20) is parallel to the row arrangement direction of the plurality of battery cells (110); Or, the first fitting surface (12) is perpendicular to the column arrangement direction of the plurality of battery cells (110), and the extending direction of the bearing beam (20) is parallel to the column arrangement direction of the plurality of battery cells (110).

22. An electrical device, characterized in that, The electrical equipment includes the battery pack according to claim 20 or 21.

23. The electrical equipment according to claim 22, characterized in that, The electrical equipment further includes a mobile vehicle frame. The battery box further includes a mounting beam (120). The mounting beam (120) is arranged outside the box body structure (10) and is fixedly connected to the box body structure (10); the mounting beam (120) is connected to the mobile vehicle frame to fix the battery pack on the mobile vehicle frame.

24. The electrical device according to claim 23, characterized in that, The mobile vehicle frame has a vehicle head and a vehicle tail. The battery cell (110) has a length direction, a height direction, and a width direction that are perpendicular to each other. The height direction of the battery cell (110) is parallel to the gravity direction. The width direction of the battery cell (110) is parallel to the row arrangement direction of the plurality of battery cells (110). The length direction of the battery cell (110) is parallel to the column arrangement direction of the plurality of battery cells (110). Among them, the number of rows in which the plurality of battery cells (110) are arranged is greater than the number of columns, and the row arrangement direction of the plurality of battery cells (110) points from the vehicle head to the vehicle tail. The first bonding surface (12) is located at the vehicle tail position.

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