Battery shell, battery pack and electric equipment

Abstract

The invention provides a battery shell, a battery pack and electric equipment, the battery shell comprises a battery tray, a cover plate, a connecting piece and sealant, 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 stacked, the connecting piece is arranged at the stacked part of the cover plate and the battery tray in a penetrating mode, and the sealant is arranged on the connecting piece. The sealant is used for connecting the cover plate and the battery tray and is arranged at the laminated part of the cover plate and the battery tray. The connecting pieces comprise first connecting pieces and second connecting pieces, at least two first connecting pieces are adjacently arranged on the outer edge of the same side of the cover plate, a first distance L1 is formed between every two adjacent first connecting pieces, a second distance L2 is formed between every two adjacent second connecting pieces or between the adjacent first connecting piece and the second connecting piece, and the first distance L1 is larger than the second distance L2. And the first spacing L1 and the second spacing L2 meet the condition that 1.5 < = L1 / L2 < = 2. The battery shell disclosed by the invention has relatively high sealing reliability and exhaust reliability, so that the safety of the battery pack is improved.

Description

Technical Field

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

[0002] With the development of new energy, battery pack safety issues have also received sufficient attention. How to prevent battery packs from losing control and catching fire under various complex and extreme working conditions is a difficult problem that needs to be overcome urgently.

[0003] The battery pack may include a battery case and multiple groups of battery cells, each group of battery cells includes multiple battery cells, and the battery case, as a component that carries the battery cells, can fix the multiple groups of battery cells in the accommodating cavity of the battery case, and the battery case can be connected to the chassis of the whole vehicle, so as to install the battery pack as a whole to the whole vehicle. In order to discharge the high-temperature gas generated by the thermal runaway of the battery cell to the outside of the battery pack in time, the relevant technology mainly adopts the method of setting an explosion-proof valve on the battery case for exhaust, but the working reliability of the explosion-proof valve is low. Summary of the invention

[0004] Based on this, the present application provides a battery housing, a battery pack and an electrical device. In the battery housing of the present application, the first spacing between two adjacent first connectors is relatively large. When the battery pack thermally runs away, due to the lack of pre-tightening force of the sealant between the two adjacent first connectors, the gas can break through the sealant there and be discharged to the outside, thereby eliminating the explosion-proof valve in the related technology, thereby improving the exhaust reliability of the battery housing.

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

[0006] Battery tray;

[0007] A cover plate, the cover plate is disposed on the battery tray, and 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 overlapped;

[0008] A plurality of connectors, which are arranged through the stacked portion of the cover plate and the battery tray to connect the cover plate and the battery tray;

[0009] The plurality of connectors include at least two first connectors and at least two second connectors. On the outer edge of the same side of the cover plate, at least two first connectors are adjacently arranged. A first spacing L1 is provided between two adjacent first connectors. A second spacing L2 is provided between two adjacent second connectors or between an adjacent first connector and a second connector. The first spacing L1 and the second spacing L2 satisfy: 1.5≤L1 / L2≤2.

[0010] The sealant is arranged at the stacked portion 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: 80 mm ≤ L1 ≤ 220 mm;

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

[0013] In a possible implementation, the battery tray includes two longitudinal beams, and the two longitudinal beams are arranged in parallel;

[0014] The cover plate includes two longitudinal edges, and the two longitudinal edges and the two longitudinal beams are stacked one by one;

[0015] At least two adjacent first connecting members are located at at least one end of at least one longitudinal beam.

[0016] In a possible implementation, the battery tray further includes two cross beams, which are arranged in parallel;

[0017] The cover plate includes two transverse edges, and the two transverse edges and the two cross beams are stacked in a one-to-one correspondence;

[0018] At least two adjacent first connecting members are located at at least one end of at least one crossbeam.

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

[0020] In a possible implementation, the battery housing further includes: a plurality of connection holes, the plurality of connection holes are arranged along the circumference of the cover plate, the plurality of connection holes all penetrate the stacked portion of the cover plate and the battery tray, and the connectors are connected to the connection holes.

[0021] In a possible implementation, the connecting hole is a threaded hole, and the connecting piece is a threaded connecting piece.

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

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

[0024] In a third aspect, the present application provides an electrical device, including an electrical device and the battery pack provided in the second aspect above, wherein the battery pack is used to supply power to the electrical device.

[0025] The present application provides a battery housing, a battery pack and an electrical device, wherein the battery housing comprises a battery tray, a cover plate, a connector and a sealant. A battery tray is provided for supporting the battery cells so as to improve the overall mechanical properties of the battery casing; a cover plate is provided for sealing connection with the battery tray so that the cover plate and the battery tray jointly define a space for accommodating the battery cells; a connector is provided for connecting the battery tray and the cover plate so as to keep the battery casing lightweight and improve the connection strength between the battery tray and the cover plate so as to improve the overall mechanical properties of the battery casing; a sealant is provided for sealing the gap between the cover plate and the battery tray; a first spacing L1 is provided between two adjacent first connectors, a second spacing L2 is provided between two adjacent second connectors or between adjacent first connectors and second connectors, and the first spacing L1 and the second spacing L2 satisfy the following relationship: 1.5≤L1 / L2≤2, so that the position between two adjacent first connectors is a weak sealing portion of the battery casing; when the air pressure in the battery casing increases, the air pressure can break open the sealant between the two adjacent first connectors to discharge the gas to the outside of the battery casing, thereby reducing the air pressure in the battery casing, thereby improving the safety of the battery pack. Furthermore, when the air pressure in the battery housing is in a normal state, the sealant can reliably seal the gap between the battery tray and the cover plate. Therefore, the battery housing provided by the present 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 present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the battery housing, battery pack and electrical equipment provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of the structure of a battery housing provided in an embodiment of the present application;

[0029] Figure 2 for Figure 1 A partial enlarged view of the middle part;

[0030] Figure 3A schematic diagram of the structure of a connector in a battery housing provided in an embodiment of the present application;

[0031] Figure 4 A schematic diagram of the internal air pressure of a battery pack with an explosion-proof valve having a valve opening pressure of 20 kPa according to the related art;

[0032] Figure 5 This is a schematic diagram of the internal air pressure of the battery pack heat diffusion when the first spacing L1 is 80 mm and the second spacing L2 is 40 mm in this embodiment;

[0033] Figure 6 Schematic diagram of the internal air pressure of the battery pack during heat diffusion when the first spacing L1 is 220 mm and the second spacing L2 is 110 mm in this embodiment.

[0034] Description 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 purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] The terms "first", "second", "third" (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0040] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0041] The battery pack may include a battery case and multiple groups of battery cells, each group of battery cells includes multiple battery cells, and the battery case, as a component that carries the battery cells, can fix the multiple groups of battery cells in the accommodating cavity of the battery case, and the battery case can be connected to the chassis of the whole vehicle, so that the battery pack can be installed as a whole to the whole vehicle. In order to discharge the high-temperature gas generated by the thermal runaway of the battery cells to the outside of the battery pack in time, the relevant technology mainly adopts the method of setting an explosion-proof valve on the battery case for directional exhaust. However, the explosion-proof valve is prone to insufficient exhaust and the problem of not opening due to runaway, and after long-term use, its sealing will also be reduced, which leads to low working reliability of the explosion-proof valve.

[0042] The specific implementation of the battery case, battery pack and electrical equipment provided in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0043] An embodiment of the present application provides an electric device, which may include an electric device and a battery pack, and the battery pack is used to supply power to the electric device.

[0044] Exemplarily, the electrical equipment may be a vehicle, the electrical device may be an electric motor, and the battery pack may provide electrical energy to the electric motor, thereby driving the vehicle to travel.

[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; referred to as: PEV / BEV), a range extended electric vehicle (Range Extended Electric Vehicle; referred to as: REEV), a hybrid electric vehicle (Hybrid Electric Vehicle; referred to as: HEV), 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 further provides a battery pack, which may include a battery cell and a battery shell. The battery cell is arranged in the battery shell, and the battery shell is used to carry the battery cell, 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, and the battery casing is used to integrate the battery cells and protect the battery cells inside the battery casing, and then assemble multiple battery cells 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 to 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, the battery housing 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 the battery housing is provided with a plurality of connectors 300 and a sealant. 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. A sealant is arranged 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 outer edge of the same side of the cover plate 200, at least two first connectors 310 are adjacently arranged, and a first spacing L1 is provided between two adjacent first connectors 310. A second spacing L2 is provided between two adjacent second connectors 320 or between adjacent first connectors 310 and second connectors 320. The first spacing L1 and the second spacing L2 satisfy the following: 1.5≤L1 / L2≤2.

[0051] It should be noted that, for electrical equipment such as vehicles, the cover plate 200 may be a structure independent of the vehicle body, or may be a structure integrated with the vehicle body floor, which is not limited in this embodiment.

[0052] In the present application, the battery tray 100 is used to improve the overall strength, overall rigidity and overall stability of the battery casing. The battery tray 100 is used to support the battery cells. The cover plate 200 is sealed and connected to the battery tray 100. The cover plate 200 and the battery tray 100 jointly define a receiving cavity for accommodating the battery cells. The multiple battery cells are then integrated together through the battery casing. In addition, the battery casing can provide mechanical protection for the battery cells located in the receiving cavity, thereby ensuring the normal operation of the battery cells.

[0053] In order to make the battery shell lightweight and have high mechanical strength at the same time, the battery tray 100 and the cover plate 200 can be connected by means of threaded connection or riveting, and the circumferential outer edge of the cover plate 200 is overlapped on the circumferential inner edge of the battery tray 100, or the circumferential inner edge of the battery tray 100 is overlapped on the circumferential outer edge of the cover plate 200, so that in the height direction of the battery shell, the outer side of the cover plate 200 and the inner side of the battery tray 100 are at least partially overlapped, which makes it convenient to subsequently use connecting parts 300 such as screws or rivets to connect the overlapping parts of the cover plate 200 and the battery tray 100.

[0054] In addition, sealant can be provided at the stacked parts of the battery tray 100 and the cover plate 200 to improve the sealing of the joints between the battery tray 100 and the cover plate 200, so as to prevent water vapor from penetrating into the interior of the battery pack from the joints between the battery tray 100 and the cover plate 200 when the battery pack is working normally. Thus, the sealant can improve the sealing of the battery casing.

[0055] In a specific configuration, the sealant may be provided in a circle along the circumference of the battery tray 100 to effectively seal the stacked portion of the battery tray 100 and the cover plate 200 .

[0056] It can be understood that the battery housing can be a box-type structure, the cover plate 200 is a quadrilateral, and connectors 300 can be set on the four outer edges of the cover plate 200, that is, a number of connectors 300 can be arranged along each outer edge of the cover plate 200, thereby connecting the cover plate 200 and various parts of the battery tray 100, thereby improving the connection strength between the cover plate 200 and the battery tray 100.

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

[0058] Specifically, the connector 300 may include a first connector 310 and a second connector 320 , both of which penetrate the stacking portion of the cover plate 200 and the battery tray 100 , and both of which can connect the cover plate 200 and the battery tray 100 .

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

[0060] It is understandable that if the first spacing L1 is too large, the two adjacent first connectors 310 are far apart, and there is no connector 300 between the cover plate 200 and the battery tray 100 between the two adjacent first connectors 310, which will reduce the connection strength between the cover plate 200 and the battery tray 100. If the first spacing L1 is too small, the gap between the first spacing L1 and the second spacing L2 cannot be widened, and the sealant between the two adjacent first connectors 310 cannot form a weak point. Therefore, the first spacing L1 and the second spacing L2 that meet the above-mentioned setting method can ensure the connection strength between the cover plate 200 and the battery tray 100, and can also ensure the reliability of battery pack exhaust.

[0061] For example, four connectors 300 are provided on any outer edge of the cover plate 200 , and the four connectors 300 include two first connectors 310 and two second connectors 320 , and the arrangement order is: first connector 310 , first connector 310 , second connector 320 , and second connector 320 . In this way, there is a first spacing L1 between the first connector 300 and the second connector 300, a second spacing L2 between the second connector 300 and the third connector 300, and a second spacing L2 between the third connector 300 and the fourth connector 300, that is, there is a first spacing L1 between two adjacent first connectors 310, a second spacing L2 between adjacent first connectors 310 and second connectors 320, and a second spacing L2 between two adjacent second connectors 320. Compared with the sealant between the adjacent first connectors 310 and the second connector 320 and the sealant between the adjacent second connectors 320, the sealant between the adjacent first connectors 310 is subjected to a smaller pre-tightening force, and the connection strength at this location is smaller, which is a weak sealing part. When the air pressure in the battery shell is high, the cover plate 200 at this location is easy to bulge, and the gas is easy to break the sealant between the two adjacent first connectors 310, thereby causing the gas to be discharged to the outside of the battery shell.

[0062] In order to solve the problem of poor reliability of the explosion-proof valve itself in the related art, in the present application, the sealant between the two adjacent first connectors 310 can be used instead of the explosion-proof valve for directional exhaust. Before the battery pack leaves the factory, the first connector 310, the second connector 320 and the sealant can be used to connect the battery tray 100 and the cover plate 200 to prevent the external liquid from entering the battery pack when the battery pack is working. The waterproof sealing performance of the explosion-proof valve in the related art will decrease after a period of use, while the sealant can always maintain good sealing when it is not flushed, which can better solve this problem. When the battery pack is working abnormally, high-temperature gas is generated in the battery shell, and when the gas pressure reaches a certain level, the gas can break through the sealant between the two adjacent first connectors 310, and then discharge the high-temperature gas to the space outside the battery shell, thereby improving the safety of the battery pack.

[0063] In addition, compared with setting an explosion-proof valve on the battery shell, the first connecting member 310, the second connecting member 320 and the sealant are used in combination, and the sealing reliability and exhaust reliability of the battery shell are higher, and the manufacturing cost of the battery shell can be reduced, thereby reducing the cost of the battery pack.

[0064] Among them, two first connectors 310 can be provided, and two adjacent first connectors 310 are provided at one outer edge of the cover plate 200. In order to improve the exhaust effect, multiple first connectors 310 can also be provided, and multiple first connectors 310 are provided at one outer edge of the cover plate 200, and at least two first connectors 310 are provided adjacent to each other, or at least two adjacent first connectors 310 can be provided at both outer edges of the cover plate 200, or at least two adjacent first connectors 310 can be provided at three outer edges of the cover plate 200, or at least two adjacent first connectors 310 can be provided at each outer edge of the cover plate 200.

[0065] The battery case provided in the embodiment of the present application includes a battery tray 100, a cover plate 200, a connector 300 and a sealant. The battery tray 100 is provided to support the battery case so as to improve the overall mechanical properties of the battery case. The cover plate 200 is provided to be sealed and connected to the battery tray 100, so that the cover plate 200 and the battery tray 100 jointly define a space for accommodating battery cells. The connector 300 is provided to connect the battery tray 100 and the cover plate 200, so as to keep the battery case lightweight and improve the connection strength between the battery tray 100 and the cover plate 200, thereby improving the overall mechanical properties of the battery case. The sealant is provided to seal the gap between the battery tray 100 and the cover plate 200 to prevent external liquids from entering the battery case through the gap between the battery tray 100 and the cover plate 200. In this way, it is beneficial to ensure the normal operation of the battery cell located in the battery housing. By making the first spacing L1 between the two adjacent first connectors 310, the second spacing L2 between the two adjacent second connectors 320 or the adjacent first connectors 310 and the second connector 320, and making the first spacing L1 and the second spacing L2 satisfy: 1.5≤L1 / L2≤2, so that the position between the two adjacent first connectors 310 is the weak sealing part of the battery housing. When the air pressure in the battery housing increases, the air pressure can break the sealant between the two adjacent first connectors 310 to discharge the gas to the outside of the battery housing, thereby reducing the air pressure in the battery housing, thereby improving the safety of the battery pack. In addition, when the air pressure in the battery housing is in a normal state, the sealant can reliably seal and connect the battery tray 100 and the cover plate 200. Therefore, the battery housing provided in 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 distance L1 satisfies: 80 mm≤L1≤220 mm, and / or the second distance L2 satisfies: 40 mm≤L2≤110 mm.

[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 interval 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 graph shows the change of the gas 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 graph 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 80 mm and the second spacing L2 is 40 mm, when a single battery cell has 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 35 kPa. 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 is in 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 10 kPa. In this way, setting the first spacing L1 between 80-220 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] Exemplarily, the first spacing L1 can be any one of 80㎜, 100㎜, 120㎜, 140㎜, 200㎜, 220㎜ or within any two numerical ranges, and / or the second spacing L2 can be any one of 40㎜, 45㎜, 50㎜, 55㎜, 100㎜, 110㎜ 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, which can be considered negligible by those skilled in the art.

[0073] Reference Figure 1 and Figure 2As shown, in some embodiments, the battery tray 100 includes 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 one by one, and at least two adjacent first connecting members 310 are located at at least one end of at least one longitudinal beam 110, thereby forming a sealing weak point at at least one end of at least one longitudinal beam 110.

[0074] Continue to refer to Figure 1 and Figure 2 As shown, in some embodiments, the battery tray 100 also includes two beams 120, the two beams 120 are arranged in parallel, the cover plate 200 includes two lateral edges, and the two lateral edges and the two beams 120 are stacked one by one, and at least two adjacent first connecting members 310 are located at at least one end of at least one beam 120, thereby forming a sealing weak point at at least one end of at least one beam 120.

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

[0076] When the battery housing is installed on a vehicle, the longitudinal beam 110 extends in the front-rear direction of the vehicle, the cross beam 120 extends in the left-right direction of the vehicle, and the height direction of the battery housing is consistent with the height direction of the vehicle.

[0077] In this way, after the battery pack is installed on the vehicle, if two adjacent first connecting members 310 are arranged in the middle part of the longitudinal beam 110 or in the middle part of the cross beam 120, when the gas breaks through the sealant in these weak sealing parts, since the positions corresponding to the chassis and these parts do not have enough space for exhaust, it is easy to cause high pressure problems in the battery pack. However, the positions corresponding to the two ends of the chassis and the longitudinal beam 110, and the positions corresponding to the two ends of the chassis and the cross beam 120 have enough space for exhaust. When the gas breaks through the sealant in these weak sealing parts, it can be discharged smoothly.

[0078] Therefore, two adjacent first connectors 310 are arranged at one end or both ends of a longitudinal beam 110, or two adjacent first connectors 310 are arranged at one end or both ends of two longitudinal beams 110, or two adjacent first connectors 310 are arranged at one end or both ends of a cross beam 120, or two adjacent first connectors 310 are arranged at one end or both ends of two cross beams 120, so as to guide the gas to be discharged in a directional manner, thereby effectively reducing the gas pressure of the battery pack.

[0079] In a possible implementation, two adjacent first connecting members 310 are disposed at both ends of the two longitudinal beams 110 and at both ends of the two transverse beams 120 .

[0080] That is to say, two adjacent first connectors 310 are provided at the four corners of the battery casing. When any one of the multiple battery cells triggers thermal runaway to generate gas, the gas will first break through the sealant between the two adjacent first connectors 310 and then be discharged. In this way, the gas can be discharged to the external space as quickly as possible, thereby increasing the exhaust rate of the battery casing.

[0081] In a possible implementation, the battery housing further includes a plurality of connection holes, which are arranged along the circumference of the cover plate 200 , and all of the connection holes penetrate the stacked portion of the cover plate 200 and the battery tray 100 .

[0082] In this way, after the connecting member 300 is sequentially inserted through the connecting hole located on the battery tray 100 and the connecting hole located on 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 housing.

[0083] In a specific implementation, the connecting hole is a threaded hole, and the connecting member 300 is a threaded connecting member. The threaded connecting member has a good pre-tightening effect on the cover plate 200. When two adjacent threaded connecting members are arranged more densely, the connection strength between the cover plate 200 and the battery tray 100 can be effectively improved. When two adjacent threaded connecting members are arranged more sparsely, the connection strength between the cover plate 200 and the battery tray 100 can be appropriately reduced.

[0084] When the stacked parts of the cover plate 200 and the battery tray 100 are connected by threads, it is necessary to form threaded holes in the stacked parts of the cover plate 200 and the battery tray 100 in advance. During processing, the stacked parts of the cover plate 200 and the battery tray 100 can be tapped to form threaded holes, and then the threaded connector 300 is threadedly connected to the threaded holes to reliably connect the battery tray 100 and the cover plate 200.

[0085] Alternatively, the threaded holes do not need to be pre-processed, and the threaded connector 300 can be used to tap the connection between the cover plate 200 and the battery tray 100 to form a threaded connection hole at the connection between the cover plate 200 and the battery tray 100, while the threaded connector 300 connects the battery tray 100 and the cover plate 200.

[0086] Before using the connector 300 to fix the cover plate 200 and the battery tray 100 , a fluid sealant may be applied to the stacked portion of the cover plate 200 and the battery tray 100 . After the sealant is cured, the gap between the cover plate 200 and the battery tray 100 may be effectively sealed.

[0087] Among them, the threaded connector 300 can be a threaded connector 300 such as a screw or a bolt, which is not limited in the embodiment of the present application.

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

[0089] For example, an exhaust channel can be set on the inner side of the cover plate 200, or on the inner side of the battery tray 100, or both. In this way, when the battery cells in the battery casing generate heat and generate gas, the gas can flow along the exhaust channel and then break the sealant between two adjacent first connectors 310 to be discharged outside the battery casing, thereby realizing the directional exhaust function of the battery pack, thereby preventing the battery cells from causing safety problems due to thermal runaway, etc., thereby 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, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to 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) is at least partially overlapped with the inner side of the battery tray (100); A plurality of connecting members (300), wherein the plurality of connecting members (300) are disposed 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), and the first spacing L1 and the second spacing L2 satisfy: 1.5≤L1 / L2≤2; 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 housing according to claim 1, characterized in that: The first distance L1 satisfies: 80 mm ≤ L1 ≤ 220 mm; And / or, the second distance L2 satisfies: 40㎜≤L2≤110㎜.

3. The battery housing according to claim 1 or 2, characterized in that: The battery tray (100) comprises two longitudinal beams (110), and the two longitudinal beams (110) are arranged in parallel; The cover plate (200) comprises 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 of the longitudinal beams (110).

4. The battery case according to claim 3, characterized in that: The battery tray (100) further comprises two cross beams (120), wherein the two cross beams (120) are arranged in parallel; The cover plate (200) comprises two transverse edges, and the two transverse edges and the two crossbeams (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).

5. The battery casing according to claim 4, 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).

6. The battery case according to claim 1 or 2, 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 penetrate the stacked portion of the cover plate (200) and the battery tray (100), and the connection piece (300) is connected to the connection holes.

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

8. The battery case according to claim 1 or 2, characterized in that: Also includes: An exhaust passage, at least one of the cover plate (200) and the battery tray (100) is provided with the exhaust passage.

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

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

Images