Battery case, battery pack, and electric device

Abstract

The application provides a battery shell, a battery pack and an electric device. The battery shell comprises a battery tray, a cover plate, a connecting piece and sealing glue. The cover plate is located in the battery tray. In the height direction of the battery shell, the outer side of the cover plate and the inner side of the battery tray are at least partially laminated. The connecting piece is arranged at the laminated part of the cover plate and the battery tray to connect the cover plate and the battery tray. The sealing glue is arranged at the laminated part of the cover plate and the battery tray. The connecting piece comprises first connecting pieces and second connecting pieces. On the same side of the outer edge of the cover plate, at least two first connecting pieces are arranged adjacently. The first spacing L1 is arranged between the two adjacent first connecting pieces. The second spacing L2 is arranged between the two adjacent second connecting pieces or between the adjacent first connecting piece and the second connecting piece. The first spacing L1 and the second spacing L2 satisfy 1.5<=L1 / L2<=2. The battery shell has high sealing reliability and exhaust reliability, thereby improving the safety of the battery pack.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery shell, a battery pack and a power consumption device. BACKGROUND

[0002] With the development of new energy, the safety of the battery pack has also been fully concerned. How to prevent the battery pack from catching fire under various complex and extreme working conditions is a difficult problem that needs to be solved urgently.

[0003] The battery pack can include a battery shell and a plurality of groups of battery cells, each group of battery cells including a plurality of battery cells. The battery shell, as a bearing member of the battery cells, can fix the plurality of groups of battery cells in a containing cavity of the battery shell. The battery shell can be connected to the chassis of the whole vehicle, and then the whole battery pack can be installed to the whole vehicle. In order to timely discharge the high-temperature gas generated by the thermal runaway of the battery cells to the outside of the battery pack, the related art mainly uses an explosion-proof valve provided on the battery shell for exhaust. However, the working reliability of the explosion-proof valve is low. SUMMARY

[0004] Therefore, the present application provides a battery shell, a battery pack and a power consumption device. In the battery shell of the present application, the first spacing between the two adjacent first connecting pieces is large. When the battery pack is in thermal runaway, the sealing glue between the two adjacent first connecting pieces lacks pre-tightening force, and the gas can break through the sealing glue at this position and be discharged to the outside. Thus, the explosion-proof valve in the related art can be cancelled, and the exhaust reliability of the battery shell can be improved.

[0005] In a first aspect, the present application provides a battery shell, comprising:

[0006] a battery tray;

[0007] a cover plate, the cover plate being arranged on the battery tray, and the outer side of the cover plate and the inner side of the battery tray being at least partially laminated in the height direction of the battery shell;

[0008] a plurality of connecting pieces, the plurality of connecting pieces being arranged in the laminated position of the cover plate and the battery tray to connect the cover plate and the battery tray;

[0009] The plurality of connecting pieces include at least two first connecting pieces and at least two second connecting pieces. On the same side outer edge of the cover plate, the at least two first connecting pieces are arranged adjacent to each other, and the first spacing L1 between the adjacent two first connecting pieces is provided. The second spacing L2 between the adjacent two second connecting pieces or between the adjacent first connecting piece and second connecting piece is provided. The first spacing L1 and the second spacing L2 satisfy: 1.5≤L1 / L2≤2.

[0010] sealing glue, the sealing glue being arranged in the laminated position of the cover plate and the battery tray to seal the gap between the cover plate and the battery tray.

[0011] In a possible implementation, the first distance L1 satisfies: 80mm≤L1≤220mm.

[0012] And / or, the second distance L2 satisfies: 40mm≤L2≤110mm.

[0013] In a possible implementation, the battery tray comprises two longitudinal beams arranged in parallel.

[0014] The cover plate comprises two longitudinal edges, and the two longitudinal edges and the two longitudinal beams are one-to-one stacked.

[0015] The at least two adjacent first connecting pieces are located at at least one end of the at least one longitudinal beam.

[0016] In a possible implementation, the battery tray further comprises two transverse beams arranged in parallel.

[0017] The cover plate comprises two transverse edges, and the two transverse edges and the two transverse beams are one-to-one stacked.

[0018] The at least two adjacent first connecting pieces are located at at least one end of the at least one transverse beam.

[0019] In a possible implementation, both ends of the two longitudinal beams and both ends of the two transverse beams are provided with the at least two adjacent first connecting pieces.

[0020] In a possible implementation, the battery shell further comprises a plurality of connecting holes arranged along the circumference of the cover plate, the plurality of connecting holes all penetrate the stacked parts of the cover plate and the battery tray, and the connecting pieces are connected with the connecting holes.

[0021] In a possible implementation, the connecting holes are threaded holes, and the connecting pieces are threaded connecting pieces.

[0022] In a possible implementation, the battery shell further comprises an exhaust passage, and at least one of the cover plate and the battery tray is provided with the exhaust passage.

[0023] In a second aspect, the present application further provides a battery pack comprising a battery cell and the battery shell provided in the first aspect, and the battery cell is arranged in the battery shell.

[0024] In a third aspect, the present application provides a power consumption device comprising a power consumption apparatus and the battery pack provided in the second aspect, and the battery pack is used to supply power to the power consumption apparatus.

[0025] The application provides a battery shell, a battery pack and an electric device. The battery shell comprises a battery tray, a cover plate, a connecting piece and sealing glue. The battery tray is arranged to support the battery cell, so as to improve the overall mechanical performance of the battery shell. The cover plate is arranged to be sealingly connected with the battery tray, so as to make the cover plate and the battery tray jointly define a space for accommodating the battery cell. The connecting piece is arranged to connect the battery tray and the cover plate, so as to make the battery shell keep lightweight and improve the connecting strength between the battery tray and the cover plate, thereby improving the overall mechanical performance of the battery shell. The sealing glue is arranged to seal the gap between the cover plate and the battery tray. The first spacing L1 between the two adjacent first connecting pieces, the second spacing L2 between the two adjacent second connecting pieces or between the adjacent first connecting piece and second connecting piece, and the relationship between the first spacing L1 and the second spacing L2 satisfy 1.5<=L1 / L2<=2, so that the position between the two adjacent first connecting pieces is the sealing weak part of the battery shell. When the air pressure in the battery shell increases, the sealing glue between the two adjacent first connecting pieces is broken by the air pressure, so as to discharge the gas outside the battery shell, thereby reducing the air pressure in the battery shell, and improving the safety of the battery pack. When the air pressure in the battery shell is in a normal state, the sealing glue can reliably seal the gap between the battery tray and the cover plate. Therefore, the battery shell provided by the application has high sealing reliability and exhaust reliability, thereby improving the safety of the battery pack.

[0026] In addition to the technical problems solved by the embodiments of the application described above, the technical features constituting the technical solutions and the beneficial effects brought by these technical features, other technical problems solved by the battery shell, the battery pack and the electric device provided by the application, and the beneficial effects brought by these technical features will be further described in detail in the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Figure 1 The structural schematic diagram of the battery shell provided by the embodiments of the application;

[0029] Figure 2 For Figure 1 The local enlarged view of A in the middle;

[0030] Figure 3A structural schematic diagram of a connecting piece in a battery shell provided by an embodiment of the present application is shown in FIG. 1.

[0031] Figure 4 A battery pack thermal diffusion internal gas pressure schematic diagram of a related art explosion-proof valve with a 20 kpa valve opening pressure is shown in FIG. 2.

[0032] Figure 5 A battery pack thermal diffusion internal gas pressure schematic diagram of an embodiment of the present application in which the first distance L1 is 80 mm and the second distance L2 is 40 mm is shown in FIG. 3.

[0033] Figure 6 A battery pack thermal diffusion internal gas pressure schematic diagram of an embodiment of the present application in which the first distance L1 is 220 mm and the second distance L2 is 110 mm is shown in FIG. 4.

[0034] Explanation of Reference Numerals:

[0035] 100 - battery tray; 110 - longitudinal beam; 120 - cross beam; 200 - cover plate; 300 - connecting piece; 310 - first connecting piece; 320 - second connecting piece. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the preferred embodiments of the present application. Identical or similar numerals in the drawings represent identical or similar components or components with identical or similar functions throughout. The described embodiments are some of the embodiments of the present application, but not all of the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, but cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0037] In the description of the present application, it should be noted that unless explicitly defined and limited, the terms "mounting", "connection", and "connection" should be understood broadly, for example, it can be a fixed connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0039] The terms "first", "second", "third" (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily describe a particular order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0040] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or display that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or displays.

[0041] The battery pack can include a battery shell and a plurality of groups of battery cells, each group of battery cells including a plurality of battery cells, the battery shell serving as a member for carrying the battery cells, the plurality of groups of battery cells can be fixed in a receiving cavity of the battery shell, and the battery shell can be connected with a chassis of a whole vehicle, and then the whole battery pack is installed to the whole vehicle. In order to timely discharge the high-temperature gas generated by the thermal runaway of the battery cells to the outside of the battery pack, in the related art, a relief valve is mainly arranged on the battery shell for directional exhaust, but the relief valve is prone to problems of insufficient exhaust and uncontrollable opening, and its sealing performance will also be reduced after long-term use, thereby causing low working reliability of the relief valve.

[0042] The specific embodiments of the battery shell, the battery pack and the power consumption equipment provided by the embodiments of the present application are described in detail below in combination with the drawings.

[0043] The embodiments of the present application provide a power consumption equipment, which can include a power consumption device and a battery pack, and the battery pack is used to supply power for the power consumption equipment.

[0044] For example, the power consumption equipment can be a vehicle, the power consumption device can be an electric motor, and the battery pack can provide power for the electric motor, and then drive the vehicle to run through the electric motor.

[0045] It should be understood that the vehicle can be a new energy vehicle (New Energy Vehicle), such as a pure electric vehicle (Pure Electric Vehicle / Battery Electric Vehicle; abbreviated as: PEV / BEV), a range extended electric vehicle (Range Extended Electric Vehicle; abbreviated as: REEV), a hybrid electric vehicle (Hybrid Electric Vehicle; abbreviated as: HEV), or a fuel cell electric vehicle), and the vehicle can also be any vehicle with a battery pack.

[0046] Reference Figure 1 As shown, based on the above embodiments, an embodiment of the present application also provides a battery pack, which may include battery cells and a battery shell. The battery cells are arranged in the battery shell, and the battery shell is used to carry the battery cells, and the battery pack is installed to the electrical equipment through the battery shell.

[0047] It should be understood that a single battery cell can only provide a smaller voltage and a shorter battery life. For electrical devices that require a higher voltage, multiple battery cells need to be integrated. Therefore, multiple battery cells can be connected in series. The battery casing is used to integrate the battery cells and protect the battery cells located inside the battery casing, and then the multiple battery cells are assembled to form a battery pack with a higher voltage and a longer battery life.

[0048] When the battery pack is installed on an electrical device, the battery casing serves as an intermediate connecting component. For example, when the electrical device is a vehicle, the vehicle may include a chassis, an electric motor and a battery pack. Both the electric motor and the battery pack may be installed on the chassis. The battery pack may provide electrical energy for the electric motor. The battery pack may be connected to the chassis through the battery casing, thereby fixing the battery pack to the chassis.

[0049] Reference Figure 1 、 Figure 2 and Figure 3 As shown, based on the above embodiment, the embodiment of the present application further provides a battery housing, which includes a battery tray 100, a cover plate 200, a plurality of connectors 300 and a sealant. The cover plate 200 is covered on the battery tray 100 and is arranged in the height direction of the battery housing (for example, Figure 1 In the Z direction), the outer side of the cover plate 200 and the inner side of the battery tray 100 are at least partially overlapped, and a plurality of connectors 300 are passed through the overlapping portion of the cover plate 200 and the battery tray 100 to connect the cover plate 200 and the battery tray 100. The sealant is provided at the overlapping portion of the cover plate 200 and the battery tray 100 to seal the gap between the cover plate 200 and the battery tray 100.

[0050] The plurality of connectors 300 include at least two first connectors 310 and at least two second connectors 320, on the same side outer edge of the cover plate 200, the at least two first connectors 310 are arranged adjacent to each other, and the adjacent two first connectors 310 have a first spacing L1, and the adjacent two second connectors 320 or the adjacent first connector 310 and the second connector 320 have a second spacing L2, and the first spacing L1 and the second spacing L2 satisfy: 1.5≤L1 / L2≤2.

[0051] It should be noted that for the electrical equipment such as vehicles, the cover plate 200 can be a structure independent of the vehicle body, or a structure integrated with the vehicle body floor, and the present embodiment does not limit this.

[0052] In the present application, the battery tray 100 is used to improve the overall strength, overall rigidity and overall stability of the battery shell, the battery tray 100 is used to support the battery cell, the cover plate 200 is sealingly connected with the battery tray 100, and the cover plate 200 and the battery tray 100 together define a receiving cavity for accommodating the battery cell, and then the plurality of battery cells are integrated together through the battery shell, and the battery shell can mechanically protect the battery cell located in the receiving cavity, thereby ensuring the normal work of the battery cell.

[0053] In order to make the battery shell have high mechanical strength while being lightweight, the battery tray 100 and the cover plate 200 can be connected by screw connection or riveting, and the circumferential outer edge of the cover plate 200 is arranged on the circumferential inner edge of the battery tray 100, or the circumferential inner edge of the battery tray 100 is arranged on the circumferential outer edge of the cover plate 200, so that the outer side of the cover plate 200 and the inner side of the battery tray 100 are at least partially laminated in the height direction of the battery shell, and then the overlapping part of the cover plate 200 and the battery tray 100 is connected by using screws or rivets as connectors 300.

[0054] In addition, the lamination part of the battery tray 100 and the cover plate 200 can also be provided with sealing glue to improve the sealing performance of the combination part of the battery tray 100 and the cover plate 200, so as to prevent water vapor from penetrating into the inside of the battery pack from the combination part of the battery tray 100 and the cover plate 200 when the battery pack is working normally, thereby the sealing glue can improve the sealing performance of the battery shell.

[0055] In specific arrangement, the sealing glue can be arranged along the circumference of the battery tray 100 to effectively seal the lamination part of the battery tray 100 and the cover plate 200.

[0056] It can be understood that the battery shell can be a box structure, the cover plate 200 is quadrangular, and the four outer edges of the cover plate 200 can be provided with the connecting pieces 300, that is, a plurality of connecting pieces 300 can be arranged along each outer edge of the cover plate 200, thereby connecting the cover plate 200 and the battery tray 100 at various positions, so as to improve the connection strength between the cover plate 200 and the battery tray 100.

[0057] On each outer edge of the cover plate 200, a plurality of connecting pieces 300 are arranged in sequence along the extension direction of the outer edge of the cover plate 200, for example, a plurality of connecting pieces 300 are arranged in the X direction, and / or a plurality of connecting pieces 300 are arranged in the Y direction.

[0058] Specifically, the connecting piece 300 can include a first connecting piece 310 and a second connecting piece 320, both of which penetrate the laminated position of the cover plate 200 and the battery tray 100, and both of which can play a connecting role between the cover plate 200 and the battery tray 100.

[0059] It should be noted that the structures of the first connecting piece 310 and the second connecting piece 320 can be the same or different. In this embodiment, on at least one outer edge of the cover plate 200, at least two first connecting pieces 310 are arranged adjacent to each other, and the first spacing L1 is provided between the two adjacent first connecting pieces 310, the second spacing L2 is provided between the two adjacent second connecting pieces 320, or the second spacing L2 is provided between the adjacent first connecting piece 310 and the second connecting piece 320, and the first spacing L1 and the second spacing L2 satisfy: 1.5≤L1 / L2≤2.

[0060] It can be understood that if the first spacing L1 is too large, the two adjacent first connecting pieces 310 are far apart, and there is no connecting piece 300 between the cover plate 200 and the battery tray 100 located between the two adjacent first connecting pieces 310, thereby reducing the connection strength between the cover plate 200 and the battery tray 100. If the first spacing L1 is too small, the difference between the first spacing L1 and the second spacing L2 cannot be pulled, thereby the sealing glue between the two adjacent first connecting pieces 310 cannot form a weak position, therefore, the first spacing L1 and the second spacing L2 satisfying the above setting mode can ensure the connection strength between the cover plate 200 and the battery tray 100, and also can ensure the reliability of the battery pack exhaust.

[0061] For example, four connecting pieces 300 are arranged on any one outer edge of the cover plate 200, the four connecting pieces 300 include two first connecting pieces 310 and two second connecting pieces 320, and the arrangement sequence is: a first connecting piece 310, a first connecting piece 310, a second connecting piece 320, and a second connecting piece 320. In this way, the first connecting piece 300 and the second connecting piece 300 have a first spacing L1, the second connecting piece 300 and the third connecting piece 300 have a second spacing L2, and the third connecting piece 300 and the fourth connecting piece 300 have the second spacing L2, that is, the first spacing L1 between the two adjacent first connecting pieces 310, the second spacing L2 between the adjacent first connecting piece 310 and the second connecting piece 320, and the second spacing L2 between the two adjacent second connecting pieces 320. Relative to the sealant between the adjacent first connecting piece 310 and the second connecting piece 320 and the sealant between the two adjacent second connecting pieces 320, the sealant between the two adjacent first connecting pieces 310 is subjected to a smaller pre-tightening force, has a smaller connection strength, and is a weak sealing position. When the air pressure in the battery shell is high, the cover plate 200 at this position is easy to bulge, and the gas is easy to break the sealant between the two adjacent first connecting pieces 310, and then the gas is discharged to the outside of the battery shell.

[0062] To solve the problem of poor reliability of the explosion-proof valve in the related art, in the present application, the sealant between the two adjacent first connecting pieces 310 can be used instead of the explosion-proof valve for directional exhaust. Before the battery pack leaves the factory, the first connecting piece 310, the second connecting piece 320, and the sealant can be used to connect the battery tray 100 and the cover plate 200 to prevent liquid from the outside from entering the battery pack during subsequent operation of the battery pack. The explosion-proof valve in the related art will decrease in waterproof sealing performance after a period of use, while the sealant can always maintain good sealing performance when it is not broken, thereby better solving this problem. When the battery pack works abnormally, high-temperature gas is generated in the battery shell, and when the gas pressure reaches a certain degree, the sealant between the two adjacent first connecting pieces 310 can be broken, and then the high-temperature gas is discharged to the space outside the battery shell, thereby improving the safety of the battery pack.

[0063] In addition, compared with arranging the explosion-proof valve on the battery shell, the first connecting piece 310, the second connecting piece 320, and the sealant are used in cooperation, the sealing reliability and exhaust reliability of the battery shell are both high, and the manufacturing cost of the battery shell can be reduced, thereby reducing the cost of the battery pack.

[0064] The first connecting piece 310 can be provided in two, and the two adjacent first connecting pieces 310 are provided on one side of the outer edge of the cover plate 200. In order to improve the exhaust effect, the first connecting piece 310 can also be provided in multiple, and the multiple first connecting pieces 310 are provided on one side of the outer edge of the cover plate 200, and at least two first connecting pieces 310 are provided adjacent to each other, or at least two adjacent first connecting pieces 310 can be provided on the outer edge of both sides of the cover plate 200, or at least two adjacent first connecting pieces 310 can be provided on the outer edge of three sides of the cover plate 200, or at least two adjacent first connecting pieces 310 can be provided on each outer edge of the cover plate 200.

[0065] The battery shell provided by the embodiment of the present application comprises a battery tray 100, a cover plate 200, a connecting piece 300 and sealing glue. The battery tray 100 is provided to support the battery shell, so as to improve the overall mechanical performance of the battery shell. The cover plate 200 is provided to be sealingly connected with the battery tray 100, so as to make the cover plate 200 and the battery tray 100 jointly define a space for accommodating the battery cell. The connecting piece 300 is provided to connect the battery tray 100 and the cover plate 200, so as to make the battery shell remain lightweight and improve the connection strength between the battery tray 100 and the cover plate 200, thereby improving the overall mechanical performance of the battery shell. The sealing glue is provided to seal the gap between the battery tray 100 and the cover plate 200, so as to prevent external liquid from entering the battery shell through the gap between the battery tray 100 and the cover plate 200, thereby being conducive to protecting the normal work of the battery cell located in the battery shell. The first interval L1 between the two adjacent first connecting pieces 310, the second interval L2 between the two adjacent second connecting pieces 320 or between the adjacent first connecting piece 310 and the second connecting piece 320, and the first interval L1 and the second interval L2 satisfy 1.5≤L1 / L2≤2, so that the position between the two adjacent first connecting pieces 310 is the sealing weak part of the battery shell. When the air pressure in the battery shell rises, the sealing glue between the two adjacent first connecting pieces 310 can be blown off by the air pressure, so as to discharge the gas outside the battery shell, thereby reducing the air pressure in the battery shell, thereby improving the safety of the battery pack. Moreover, when the air pressure in the battery shell is in a normal state, the sealing glue can reliably seal and connect the battery tray 100 and the cover plate 200. Therefore, the battery shell provided by the embodiment of the present application has high sealing reliability and exhaust reliability, thereby improving the safety of the battery pack.

[0066] In a possible implementation, the first interval L1 satisfies 80㎜≤L1≤220㎜, and / or the second interval L2 satisfies 40㎜≤L2≤110㎜.

[0067] It should be noted that when gas is generated in the battery housing, the gas needs to be discharged to the external environment in a timely manner. Therefore, the specific setting value of the first distance L1 needs to take the exhaust rate of the battery pack into consideration.

[0068] Figure 4 The figure shows the internal pressure change of the explosion-proof valve with a valve opening pressure of 20kPa during heat diffusion in the related art. Figure 5 The figure shows the change of air pressure in the battery pack when heat diffusion occurs in the battery pack with the first spacing L1 of 80 mm and the second spacing L2 of 40 mm in this embodiment. Figure 6 The diagram shows the change of air pressure in the battery pack when heat diffusion occurs in the battery pack with the first spacing L1 of 220 mm and the second spacing L2 of 110 mm in this embodiment.

[0069] Depend on Figure 5 It can be seen that when the first spacing L1 is 80mm and the second spacing L2 is 40mm, when a single battery cell experiences thermal runaway, the gas generated by the battery pack can break through the sealant between two adjacent first connectors 310 and be discharged, and the gas pressure level in the battery pack is maintained at about 35kPa. Figure 6 It can be seen that when the first spacing L1 is 220 mm and the second spacing L2 is 110 mm, when a single battery cell experiences thermal runaway, the gas generated by the battery pack can break through the sealant between two adjacent first connectors 310 and be discharged, maintaining the gas pressure level within the battery pack at approximately 10 kPa. Thus, setting the first spacing L1 between 80 and 220 mm can effectively replace the explosion-proof valve with a valve opening pressure of 20 kPa in the related art.

[0070] In this way, the second spacing L2 is between 40㎜ and 110㎜ to ensure the connection strength between the cover 200 and the battery tray 100, and the first spacing L1 is between 80㎜ and 220㎜ to ensure the reliability of exhaust, and the first spacing L1 and the second spacing L2 can also satisfy 1.5≤L1 / L2≤2.

[0071] For example, the first spacing L1 can be any one of 80mm, 100mm, 120mm, 140mm, 200mm, 220mm or within any two numerical ranges, and / or, the second spacing L2 can be any one of 40mm, 45mm, 50mm, 55mm, 100mm, 110mm or within any two numerical ranges.

[0072] Regarding numerical values ​​and numerical ranges, it should be noted that the numerical values ​​and numerical ranges involved in the embodiments of the present application are approximate values. Due to the influence of the manufacturing process, there may be a certain range of errors. Those skilled in the art may consider this part of the error to be negligible.

[0073] Reference Figure 1 and Figure 2As shown, in some embodiments, the battery tray 100 comprises two longitudinal beams 110 arranged in parallel, the cover plate 200 comprises two longitudinal edges, and the two longitudinal edges and the two longitudinal beams 110 are stacked one by one, and at least two adjacent first connectors 310 are arranged at at least one end of at least one longitudinal beam 110, thereby forming a sealing weak position at at least one end of at least one longitudinal beam 110.

[0074] With reference to the foregoing Figure 1 With reference to the foregoing Figure 2 As shown, in some embodiments, the battery tray 100 further comprises two transverse beams 120 arranged in parallel, the cover plate 200 comprises two transverse edges, and the two transverse edges and the two transverse beams 120 are stacked one by one, and at least two adjacent first connectors 310 are arranged at at least one end of at least one transverse beam 120, thereby forming a sealing weak position at at least one end of at least one transverse beam 120.

[0075] It should be noted that the extension direction of the longitudinal beam 110 can refer to the X direction in the drawings, the extension direction of the transverse beam 120 can refer to the Y direction in the drawings, and the height direction of the battery shell can refer to the Z direction in the drawings. The outer edge of the cover plate 200 extends along the X direction or the Y direction.

[0076] When the battery shell is installed on the vehicle, the extension direction of the longitudinal beam 110 is the front-rear direction of the vehicle, the extension direction of the transverse beam 120 is the left-right direction of the vehicle, and the height direction of the battery shell is consistent with the height direction of the vehicle.

[0077] In this way, when the battery pack is installed on the vehicle, if two adjacent first connectors 310 are arranged at the middle part of the longitudinal beam 110 or at the middle part of the transverse beam 120, when the sealing glue of the sealing weak position is broken by the gas, there is not enough space for exhaust at the position corresponding to these parts of the chassis, which can easily cause high pressure of the battery pack. However, the position corresponding to the two ends of the longitudinal beam 110 and the position corresponding to the two ends of the transverse beam 120 have enough space for exhaust, and the gas can be smoothly discharged when the sealing glue of the sealing weak position is broken.

[0078] Therefore, by arranging two adjacent first connectors 310 at one end or both ends of one longitudinal beam 110, or arranging two adjacent first connectors 310 at one end or both ends of two longitudinal beams 110, or arranging two adjacent first connectors 310 at one end or both ends of one transverse beam 120, or arranging two adjacent first connectors 310 at one end or both ends of two transverse beams 120, the gas can be directed to discharge, thereby effectively reducing the gas pressure of the battery pack.

[0079] In a possible implementation, two ends of the two longitudinal beams 110 and two ends of the two transverse beams 120 are each provided with two adjacent first connecting pieces 310.

[0080] That is, the four corners of the battery shell are each provided with two adjacent first connecting pieces 310, when any one of the plurality of battery cells triggers thermal runaway to generate gas, the gas will first break through the sealing glue between the two adjacent first connecting pieces 310 closest to it and then be discharged, so that the gas can be discharged to the outside space as soon as possible, thereby improving the exhaust rate of the battery shell.

[0081] In a possible implementation, the battery shell further includes a plurality of connecting holes, the plurality of connecting holes are arranged along the circumference of the cover plate 200, and the plurality of connecting holes all penetrate the laminated parts of the cover plate 200 and the battery tray 100.

[0082] In this way, when the connecting pieces 300 are sequentially threaded into the connecting holes of the battery tray 100 and the connecting holes of the cover plate 200, the battery tray 100 and the cover plate 200 can be reliably connected together, thereby improving the structural strength of the battery shell.

[0083] In specific implementation, the connecting holes are threaded holes, and the connecting pieces 300 are threaded connecting pieces, the threaded connecting pieces have a good pre-tightening effect on the cover plate 200, when the two adjacent threaded connecting pieces are arranged more densely, the connection strength of the cover plate 200 and the battery tray 100 can be effectively improved, and when the two adjacent threaded connecting pieces are arranged more sparsely, the connection strength of the cover plate 200 and the battery tray 100 can be appropriately reduced.

[0084] When the laminated parts of the cover plate 200 and the battery tray 100 are threadedly connected, threaded holes need to be formed in the laminated parts of the cover plate 200 and the battery tray 100 in advance, in processing, the laminated parts of the cover plate 200 and the battery tray 100 can be tapped to form threaded holes, and then the threaded connecting pieces 300 are threadedly connected to the threaded holes to reliably connect the battery tray 100 and the cover plate 200.

[0085] Alternatively, the threaded holes can not be processed in advance, and the threaded connecting pieces 300 can be used to tap the connecting parts of the cover plate 200 and the battery tray 100 to form threaded connecting holes while connecting the battery tray 100 and the cover plate 200.

[0086] Before the cover plate 200 and the battery tray 100 are fixed by the connecting pieces 300, a fluid sealing glue can be applied to the laminated parts of the cover plate 200 and the battery tray 100, and after the sealing glue is cured, the gap between the cover plate 200 and the battery tray 100 can be effectively sealed.

[0087] The threaded connecting piece 300 can be a screw or a bolt, and the embodiments of the present application do not limit the threaded connecting piece 300.

[0088] In a possible implementation, the battery shell further comprises an exhaust passage, and at least one of the cover plate 200 and the battery tray 100 is provided with the exhaust passage.

[0089] For example, the exhaust passage can be arranged on the inner side of the cover plate 200, or the inner side of the battery tray 100, or both the inner side of the cover plate 200 and the inner side of the battery tray 100. In this way, when the battery cell in the battery shell generates gas due to heat, the gas can flow along the exhaust passage and then break the sealant between the two adjacent first connecting pieces 310 to be discharged to the outside of the battery shell, thereby realizing the directional exhaust function of the battery pack, preventing the battery cell from causing safety problems due to thermal runaway, and improving the safety performance of the battery pack.

[0090] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery housing, characterized in that: include: Battery Tray (100); a cover plate (200), the cover plate (200) being arranged to cover the battery tray (100), wherein in the height direction of the battery housing, the outer side of the cover plate (200) and the inner side of the battery tray (100) are at least partially overlapped; a plurality of connecting members (300), wherein the plurality of connecting members (300) are provided through the stacked portion of the cover plate (200) and the battery tray (100) to connect the cover plate (200) and the battery tray (100); The plurality of connecting members (300) include at least two first connecting members (310) and at least two second connecting members (320). On the outer edge of the same side of the cover plate (200), at least two of the first connecting members (310) are adjacently arranged. A first spacing L1 is provided between two adjacent first connecting members (310). A second spacing L2 is provided between two adjacent second connecting members (320) or between adjacent first connecting members (310) and second connecting members (320). The first spacing L1 and the second spacing L2 satisfy the following relationship: 1.5≤L1 / L2≤2. The first distance L1 satisfies: 80 mm ≤ L1 ≤ 220 mm; and / or the second distance L2 satisfies: 40 mm ≤ L2 ≤ 110 mm; A sealant is provided at a stacked portion of the cover plate (200) and the battery tray (100) to seal a gap between the cover plate (200) and the battery tray (100).

2. The battery case according to claim 1, wherein: The battery tray (100) comprises two longitudinal beams (110), and the two longitudinal beams (110) are arranged in parallel; The cover plate (200) includes two longitudinal edges, and the two longitudinal edges and the two longitudinal beams (110) are stacked in a one-to-one correspondence; At least two adjacent first connecting members (310) are located at at least one end of at least one longitudinal beam (110).

3. The battery case according to claim 2, characterized in that The battery tray (100) further includes two crossbeams (120), and the two crossbeams (120) are arranged in parallel; The cover plate (200) comprises two transverse edges, and the two transverse edges and the two transverse beams (120) are stacked in a one-to-one correspondence; At least two adjacent first connecting members (310) are located at at least one end of at least one of the crossbeams (120).

4. The battery case according to claim 3, characterized in that At least two adjacent first connecting members (310) are provided at both ends of the two longitudinal beams (110) and at both ends of the two transverse beams (120).

5. The battery housing according to any one of claims 1 to 4, characterized in that: Also includes: A plurality of connection holes are provided along the circumference of the cover plate (200), the plurality of connection holes all pass through the stacked portion of the cover plate (200) and the battery tray (100), and the connection member (300) is connected to the connection holes.

6. The battery case according to claim 5, characterized in that The connecting hole is a threaded hole, and the connecting piece (300) is a threaded connecting piece.

7. The battery housing according to any one of claims 1 to 4, characterized in that: Also includes: An exhaust channel, at least one of the cover plate (200) and the battery tray (100) is provided with the exhaust channel.

8. A battery pack, characterized in that: The battery comprises a battery cell and a battery casing according to any one of claims 1 to 7, wherein the battery cell is arranged in the battery casing.

9. An electrical device, characterized in that: The device comprises an electric device and the battery pack as claimed in claim 8, wherein the battery pack is used to supply power to the electric device.

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