Battery pack and powered device

Abstract

The application provides a battery pack and an electric device, the battery pack comprising a box body, a battery cell assembly and a box cover assembly; the box body has a containing space and an opening communicating with the containing space; the battery cell assembly comprises a plurality of battery cells, and the battery cell assembly is arranged in the containing space; the box cover assembly comprises a box cover and a buffer layer, the box cover is connected with the box body to close the opening, and the buffer layer is arranged on a side of the box cover away from the containing space; and the buffer performance of the buffer layer is greater than that of the box cover. The battery pack of the application has the buffer performance of the buffer layer on the box cover during installation, so that the box cover is not easily damaged.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically to a battery pack and an electrical device. Background Technology

[0002] The battery pack mainly consists of a housing and multiple battery cells encapsulated within the housing.

[0003] In related technologies, some battery packs are quite large. During installation, installers may step on the battery pack cover, which can cause the cover to deform or even crack, thus posing a safety hazard to the battery pack. Summary of the Invention

[0004] Embodiments of the present invention provide a battery pack and an electrical device that can improve the technical problem that the battery pack cover is prone to deformation or even breakage during installation.

[0005] In a first aspect, embodiments of the present invention provide a battery pack, comprising:

[0006] A housing having a receiving space and an opening communicating with the receiving space;

[0007] A battery cell assembly, comprising a plurality of battery cells, wherein the battery cell assembly is disposed within the receiving space; and...

[0008] A box lid assembly, comprising a box lid and a buffer layer, wherein the box lid is connected to the box body to close the opening, and the buffer layer is disposed on the side of the box lid away from the receiving space, and the buffering performance of the buffer layer is greater than that of the box lid.

[0009] In one embodiment, the lid assembly further includes a panel disposed on the side of the buffer layer opposite to the lid, the panel having a rigidity greater than that of the buffer layer.

[0010] In one embodiment, the lid assembly further includes a support member connected between the lid and the panel, the support member having a rigidity greater than that of the buffer layer.

[0011] In one embodiment, the number of supports is at least two, and each side of the buffer layer in the width direction and / or each side of the buffer layer in the length direction is provided with the support.

[0012] In one embodiment, the support member is bent and includes a plurality of connecting recesses that are recessed toward the lid, and the connecting recesses are connected and fixed to the lid.

[0013] In one embodiment, the support member includes a plurality of first segments, which are arranged at intervals with the connecting recess along the length direction of the support member;

[0014] The connecting recess includes a second segment and a plurality of third segments. The second segment is connected to the box cover. One end of each third segment is bent and connected to the adjacent second segment, and the other end of each third segment is bent and connected to the adjacent first segment.

[0015] In one embodiment, the lid assembly further includes a first fastener connecting the lid to the box body; at least a portion of the first fastener also passes through the connecting recess to secure the connecting recess to the lid; wherein,

[0016] In the same support member, a plurality of connecting recesses are arranged along the edge of the cover, with a spacing of 80 mm to 100 mm between adjacent connecting recesses, and each connecting recess is fitted with a first fastener; and / or,

[0017] In the same support member, a plurality of connecting recesses are arranged along the edge of the box cover, the distance between two adjacent connecting recesses is 80 mm to 100 mm, and no first fastener is provided between two adjacent connecting recesses.

[0018] In one embodiment, the lid assembly further includes a third fastener that passes through the panel and the lid and is connected to the box body to fix both the panel and the lid to the box body.

[0019] In one embodiment, the panel is provided with a reinforcing structure.

[0020] In one embodiment, the reinforcing structure includes a first protrusion that protrudes away from the buffer layer. The first protrusion includes a first rib and a plurality of first protrusions. The first rib extends along the length direction of the panel, and a plurality of first protrusions are arranged on each side of the first rib in the width direction.

[0021] In one embodiment, on at least one side of the width direction of the first rib, the first protrusions are arranged along the length direction of the first rib, and the first protrusions are spaced apart from the first ribs to form a first groove between the first ribs and the plurality of first protrusions, and a second groove is formed between two adjacent first ribs. One end of the second groove is connected to the first groove, and the other end of the second groove is connected to the outer periphery of the panel.

[0022] In one embodiment, the first protrusion further includes a second rib, and each side edge of the panel along its length is provided with a second rib;

[0023] Each end of the first rib is connected to the second rib on one side;

[0024] The first convex bulge is located between the second convex ribs on both sides.

[0025] In one embodiment, the shape of the side surface of the panel facing the buffer layer matches the shape of the side surface of the buffer layer facing the panel.

[0026] In one embodiment, the thickness of the buffer layer is D1, and the sum of the thicknesses of the lid, the buffer layer, and the panel is D2, with the ratio of D1 to D2 being 2:3 to 7:8.

[0027] In one embodiment, the thickness of the buffer layer is D1, the thickness of the lid is D3, and the ratio of D1 to D3 is 4 to 15.

[0028] In one embodiment, the buffer cover is located at only one end of the box cover along its length.

[0029] In one embodiment, there are multiple housings and multiple battery cell assemblies, each housing is provided with a battery cell assembly, and the multiple housings are stacked along a first direction;

[0030] Along the first direction, at least one of the outermost boxes is provided with a box cover assembly.

[0031] Secondly, embodiments of the present invention provide an electrical device including a battery pack as described above.

[0032] The beneficial effects of the embodiments of the present invention are as follows:

[0033] In an embodiment of the present invention, the cover assembly can close the opening of the box body by connecting the cover to the box body; on this basis, the cover assembly provides a buffer layer on the side of the cover away from the receiving space, so that the installer can step on the buffer layer of the cover assembly for installation, so that the buffer layer provides a better cushioning effect, thereby avoiding the cover from being deformed or even damaged, and ultimately improving the technical problem that the cover of the battery pack is prone to deformation or even breakage during installation. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1This is a schematic diagram of the battery pack structure provided for an embodiment of the present invention.

[0036] Figure 2 for Figure 1 The exploded view of the battery pack shown.

[0037] Figure 3 for Figure 2 The diagram shows the structural schematic of the battery pack's cover assembly.

[0038] Figure 4 for Figure 3 The diagram shows the structural schematic of the support component for the box cover assembly.

[0039] Figure 5 for Figure 3 The exploded view of the box cover assembly is shown.

[0040] Figure 6 for Figure 1 Exploded view of some parts of the battery pack shown.

[0041] Figure 7 for Figure 1 A magnified view of the area at point X in the image.

[0042] Figure 8 for Figure 1 A schematic diagram of the structure of the first heat exchange component of the battery pack shown.

[0043] Figure 9 for Figure 1 The diagram shows the structure of the second heat exchange component of the battery.

[0044] The labels in the diagram are as follows:

[0045] 100. Enclosure; 11. Sub-enclosure; 12. Fixing lug; 121. Second positioning post; 122. Second positioning hole;

[0046] 200. Battery cell assembly; 21. Battery cell; 22. Integrated busbar;

[0047] 300. Case lid assembly; 31. Case lid; 32. Buffer layer; 321. Second protrusion; 33. Panel; 331. First protrusion; 3311. First rib; 3312. First bulge; 3313. Second rib; 332. First groove; 333. Second groove; 34. Support member; 341. Connecting recess; 3411. Second section; 3412. Third section; 342. First section; 35. First fastener; 36. Second fastener;

[0048] 400. Connecting plate;

[0049] 51. First heat exchange component; 52. Second heat exchange component;

[0050] H1, First direction; H2, Second direction; H3, Third direction. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0052] The battery pack mainly consists of a housing and multiple battery cells encapsulated within the housing.

[0053] In related technologies, some battery packs are quite large. During installation, installers may step on the battery pack cover, causing it to deform or even crack, thus posing a safety hazard. For example, a deformed or cracked cover can affect the airtightness of the battery pack; or, if the cover deforms too much, the distance between the cover and the battery cells may become too small, making the cells prone to insulation failure.

[0054] Based on this, embodiments of this application provide a battery pack and an electrical device to improve the technical problem that the battery pack cover is prone to deformation or even breakage during installation.

[0055] The battery pack can be applied to electrical devices. Electrical devices can be, but are not limited to, vehicles, smart wearable devices, mobile terminals, home appliances, and medical devices; this application embodiment does not limit this. Vehicles include, but are not limited to, cars, buses, trains, ships, and aircraft. Smart wearable devices include, but are not limited to, smartwatches, smart bracelets, and neck massagers. Mobile terminals include, but are not limited to, smartphones, laptops, tablets, and POS (point-of-sale) terminals. Home appliances include, but are not limited to, televisions, washing machines, air conditioners, rice cookers, smart robot vacuums, and smart lights. Medical devices include, but are not limited to, infrared electronic thermometers, pulse oximeters, and body composition analyzers. Of course, the battery pack can also be used in energy storage devices; this application embodiment does not limit this.

[0056] Please refer to Figure 1 , Figure 2 and Figure 3 The battery pack includes a housing 100, a cell assembly 200, and a cover assembly 300. The housing 100 has a receiving space and an opening communicating with the receiving space. The cell assembly 200 includes a plurality of cells 21, and the cell assembly 200 is disposed within the receiving space. The cover assembly 300 includes a cover 31 and a buffer layer 32. The cover 31 is connected to the housing 100 to close the opening of the housing 100. The buffer layer 32 is located on the side of the cover 31 facing away from the receiving space, and the buffering performance of the buffer layer 32 is greater than that of the cover 31.

[0057] Therefore, during the installation process, the installer can step onto the buffer layer 32 of the cover assembly 300 for installation, so that the buffer layer 32 can provide a better cushioning effect, thereby avoiding deformation or even damage to the cover 31, and ultimately improving the technical problem that the battery pack cover 31 is prone to deformation or even breakage during installation.

[0058] It should be noted that the cushioning performance of the buffer layer 32 is greater than that of the lid 31. This can be understood as the buffer layer 32 being more easily deformed than the lid 31. Therefore, when a user steps on the buffer layer 32 of the lid assembly 300, the buffer layer 32 may deform before the lid 31, thus providing cushioning for the lid 31.

[0059] For example, the buffer layer 32 may include an elastic buffer layer. The elastic buffer layer may include foam, such as MMP foam (Microporous Polypropylene foam), EVA foam (Ethylene Vinyl Acetate Copolymer Foam), etc. The buffer layer 32 may also include any structure with a buffering effect, such as an elastic rubber layer; this embodiment of the application does not limit this.

[0060] In some embodiments, the lid assembly 300 further includes a panel 33. The panel 33 is disposed on the side of the buffer layer 32 opposite to the lid 31. The rigidity of the panel 33 is greater than that of the buffer layer 32.

[0061] During installation, the user can step on the panel 33. At this time, because the panel 33 is more rigid than the buffer layer 32, it is less prone to deformation. This allows the force acting on the panel 33 to be distributed to various parts of the buffer layer 32, so that the buffer layer 32 and the panel 33 can cooperate with each other to provide better cushioning and support, thus preventing the cover 31 from deforming or even being damaged.

[0062] Panel 33 can be made of metal, rigid plastic, etc., so that the rigidity of panel 33 is greater than that of buffer layer 32. This application embodiment does not limit this. For example, panel 33 can be made of steel, such as high-strength steel of type DP780. Of course, metal parts can also be made of iron or alloy materials. This application embodiment does not limit this.

[0063] In some embodiments, the cover assembly 300 further includes a support member 34. The support member 34 is connected between the cover 31 and the panel 33, and the rigidity of the support member 34 is greater than that of the buffer layer 32. Thus, when an installer steps on the panel 33, on the one hand, the buffer layer 32 and the panel 33 can adapt to the terrain deformation to provide a better cushioning effect, thereby preventing damage to the cover assembly 300; on the other hand, the support member 34 can provide good support for the corresponding part of the panel 33, so as to avoid the panel 33 and the buffer layer 32 from being too deformed, which could cause the installer to be unstable when stepping on it.

[0064] The support member 34 may include metal parts, rigid plastic parts, etc., and this application embodiment does not limit this. For example, the metal part may be made of steel, such as high-strength steel of type DP780, etc. Of course, the metal part may also be made of iron or alloy material, and this application embodiment does not limit this.

[0065] In some embodiments, the number of support members 34 is at least two. Thus, by supporting multiple parts of the panel 33 with multiple support members 34, not only can the installation of the panel 33 be more stable, but the overall force on the panel 33 can also be more dispersed and even, so that when the installer steps on it, the force on the panel 33 can be distributed to the box cover 31, thereby avoiding deformation or even cracking of the box cover 31.

[0066] In some embodiments, at least two supports 34 are disposed on opposite sides of the buffer layer 32, so that the supports 34 can provide better support for the panel 33 from both sides of the buffer layer 32.

[0067] For example, each side of the buffer layer 32 in the width direction and / or each side of the buffer layer 32 in the length direction is provided with a support member 34.

[0068] It should be noted that in the embodiments of this application, "and / or" describes the relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. That is to say, it is possible that each side of the buffer layer 32 in the width direction is provided with a support member 34, and each side of the buffer layer 32 in the length direction is not provided with a support member 34; it is also possible that each side of the buffer layer 32 in the width direction is not provided with a support member 34, and each side of the buffer layer 32 in the length direction is provided with a support member 34; it is also possible that each side of the buffer layer 32 in the width direction is provided with a support member 34, and each side of the buffer layer 32 in the length direction is provided with a support member 34. The embodiments of this application do not limit this.

[0069] Therefore, compared to providing a support member 34 on only one side of the buffer layer 32, when a support member 34 is provided on each side of the buffer layer 32 in the width direction, it can prevent the panel 33 from collapsing or having insufficient support on one side of the buffer layer 32 in the width direction; when a support member 34 is provided on each side of the buffer layer 32 in the length direction, it can prevent the panel 33 from collapsing or having insufficient support on one side of the buffer layer 32 in the length direction.

[0070] Of course, in some other embodiments, the number of support members 34 may also be one, and this application embodiment does not limit this.

[0071] In some embodiments, the support member 34 is connected and fixed to the panel 33. Thus, it can also be understood that the support member 34 is installed on the panel 33 to avoid displacement and detachment of the panel 33, thereby ensuring the stability and reliability of the box cover assembly 300.

[0072] In some embodiments, the support member 34 is connected and fixed to the cover 31. Thus, it can also be understood that the support member 34 is installed on the cover 31 to prevent displacement or detachment of the panel 33, thereby ensuring the stability and reliability of the cover assembly 300.

[0073] It is also understandable that when the support member 34 is connected to the panel 33 and the lid 31 respectively, if each side of the buffer layer 32 in the width direction and / or each side of the buffer layer 32 in the length direction is provided with a support member 34, then when the user steps on the position corresponding to the panel 33 and the buffer layer 32, the corresponding part of the panel 33 and the buffer layer 32 will be recessed towards the lid 31. At this time, the support member 34 can limit the warping of the part of the panel 33 located on both sides of the buffer layer 32 in the length direction and / or width direction, so as to avoid excessive deformation of the panel 33. It can also be understood that the support member 34 pulls the part of the panel 33 located on both sides of the buffer layer 32 in the length direction and / or width direction, so that the overall force on the panel 33 is more even and distributed, thereby improving the stability and reliability of the lid assembly 300.

[0074] Please continue to refer to this. Figure 4 In some embodiments, the support member 34 is bent and includes multiple connecting recesses 341 recessed toward the lid 31. The connecting recesses 341 are connected and fixed to the lid 31, so that the support member 34 can form multiple connections with the lid 31 through the multiple connecting recesses 341, so that the force between the support member 34 and the lid 31 is more uniform, thereby improving the stability and reliability of the connection between the support member 34 and the lid 31.

[0075] The support member 34 can be a sheet metal part. For example, the support member 34 is a sheet metal part formed by processes such as bending, stamping, and deep drawing, thereby forming multiple connecting recesses 341.

[0076] For example, the support member 34 includes a plurality of first segments 342, which are arranged at intervals with the connecting recesses 341 along the length direction of the support member 34. The connecting recesses 341 include second segments 3411 and a plurality of third segments 3412. The second segments 3411 are connected to the cover 31. One end of each third segment 3412 is bent and connected to the adjacent second segment 3411, and the other end of each third segment 3412 is bent and connected to the adjacent first segment 342.

[0077] Therefore, it can also be understood that the support member 34 forms multiple arched structures that bend toward the cover 31 through multiple second segments 3411 and multiple third segments 3412. Thus, while the support member 34 is thin and light to reduce the weight of the battery pack, the present application embodiment can also improve the strength of the support member 34 so that the support member 34 can support the panel 33 more stably.

[0078] Please continue to refer to this. Figure 5 In some embodiments, the cover assembly 300 further includes a first fastener 35. The first fastener 35 connects the cover 31 to the housing 100, thereby allowing the cover 31 to be stably and reliably installed onto the housing 100.

[0079] In some embodiments, at least a portion of the first fastener 35 is also disposed in the connecting recess 341, so that the connecting recess 341 is fixed to the cover 31. Thus, it can also be understood that the first fastener 35 is reused for connecting and fixing the cover 31 and the support member 34, so as to reduce the number of parts of the cover assembly 300, thereby reducing the manufacturing and assembly difficulty of the cover assembly 300.

[0080] In some embodiments, multiple connecting recesses 341 are arranged along the edge of the cover 31 in the same support member 34, and the distance between two adjacent connecting recesses 341 is 80 mm to 100 mm.

[0081] Therefore, on the one hand, it can avoid the support member 34 from being too weak due to the excessively large distance between two adjacent connecting recesses 341; on the other hand, it can also avoid the support member 34 from having too many processing steps and being too difficult to process due to the excessively small distance between two adjacent connecting recesses 341.

[0082] For example, the distance between two adjacent connecting recesses 341 can be 80 mm, 83 mm, 84.7 mm, 85 mm, 89 mm, 89.3 mm, 90 mm, 90.07 mm, 92 mm, 93 mm, 94.5 mm, 95 mm, 96.7 mm, 98 mm, 98.97 mm, 99 mm, 99.5 mm or 100 mm, and this application embodiment does not limit this.

[0083] In some embodiments, each connecting recess 341 in the same support member 34 is provided with a first fastener 35, thereby avoiding excessive spacing of the first fasteners 35, and thus avoiding a decrease in the stability of the connection between the cover 31 and the box body 100, as well as a decrease in the airtightness between the cover 31 and the box body 100.

[0084] In some embodiments, no first fasteners 35 are provided between two adjacent connecting recesses 341 in the same support member 34, thereby avoiding the need for too many first fasteners 35 due to the small spacing between them, and ultimately avoiding the high assembly difficulty and cost of the cover assembly 300.

[0085] In some embodiments, on the same side edge of the housing 100, the number of first segments 342 between two adjacent first fasteners 35 is less than or equal to 1, thereby avoiding the problem of too many first fasteners 35 due to the small spacing between them, and ultimately avoiding the problem of the housing cover assembly 300 being difficult to assemble.

[0086] The first fastener 35 can be a fastening screw, such as an M5 size fastening screw. Of course, the first fastener 35 can also be a rivet, etc. This application embodiment does not limit this.

[0087] In some embodiments, the cover assembly 300 may further include a second fastener 36, which connects the first segment 342 and the panel 33. The second fastener 36 may be a fastening screw, such as an M5 size fastening screw. Of course, the first fastener 35 may also be a rivet, etc., and this application embodiment does not limit this.

[0088] In some embodiments, the lid assembly 300 may further include a third fastener, which passes through the panel 33 and the lid 31 and connects to the housing 100 to fix both the panel 33 and the lid 31 to the housing 100. Thus, it can be understood that the third fastener, in addition to connecting and fixing the lid 31 to the housing 100, also serves to connect and fix the panel 33 to the housing 100, thereby reducing the number of parts in the lid assembly 300 and reducing the manufacturing and assembly difficulty of the lid assembly 300.

[0089] For example, the third fastener can be inserted through the panel 33, the connecting recess 341, and the cover 31 and connected to the housing 100, thereby locking and fixing the panel 33, the support member 34, and the cover 31 to the housing 100. In this case, it can also be understood that at least a portion of the first fastener 35 forms the third fastener.

[0090] For example, the third fastener can be inserted through the panel 33, the first section 342, and the cover 31 and connected to the housing 100, thereby locking and fixing the panel 33, the support member 34, and the cover 31 to the housing 100. In this case, it can also be understood that at least a portion of the second fastener 36 forms the third fastener.

[0091] Of course, in some other embodiments, the third fastener may not pass through the support member 34, and this application embodiment does not limit this.

[0092] In some embodiments, the thickness of the support member 34 is 1 mm to 2 mm, which can avoid the support member 34 being too thin and thus lacking rigidity, and also avoid the support member 34 being too thick and thus reducing the energy density of the battery pack.

[0093] For example, the thickness of the support member 34 can be 1 mm, 1.1 mm, 1.27 mm, 1.3 mm, 1.5 mm, 1.67 mm, 1.79 mm, 1.85 mm, 1.9 mm or 2 mm, and this application embodiment does not limit it.

[0094] The above are some examples of the support member 34 in the embodiments of this application. The following will continue to illustrate the embodiments of this application with reference to the structure of the panel 33.

[0095] In some embodiments, the buffer layer 32 is provided only at one end of the cover 31 along the length direction. Therefore, by providing the buffer layer 32 and the panel 33 only at one end of the cover 31 along the length direction, the needs of installers to step on the battery during installation can be met, and the material consumption of the buffer layer 32 and the panel 33 can be reduced, thereby reducing the overall weight of the battery pack and the manufacturing cost.

[0096] In some embodiments, panel 33 is provided with a reinforcing structure to improve the rigidity of panel 33.

[0097] For example, the reinforcing structure includes a first protrusion 331 that protrudes in the direction away from the buffer layer 32. The height of the first protrusion 331 can be 2 mm to 3 mm, so as to avoid the first protrusion 331 being too small and thus not having enough rigidity, and to avoid the first protrusion 331 being too large and thus causing a decrease in the energy density of the battery pack.

[0098] For example, the height of the first convex hull 3312 can be 2 mm, 2.1 mm, 2.27 mm, 2.3 mm, 2.5 mm, 2.67 mm, 2.79 mm, 2.85 mm, 2.9 mm or 3 mm, and this application embodiment does not limit it.

[0099] In some embodiments, the first protrusion 331 includes a first rib 3311 and a plurality of first protrusions 3312. The first rib 3311 extends along the length direction of the panel 33, and a plurality of first protrusions 3312 are arranged on each side of the first rib 3311 in the width direction.

[0100] Understandably, as the length of panel 33 increases, the rigidity of panel 33 decreases relatively. Therefore, the first protruding rib 3311 extending along the length of panel 33 can increase the rigidity of panel 33 in the length direction. Furthermore, multiple first protrusions 3312 ensure even higher rigidity in the width direction of panel 33. Consequently, when an installer steps on panel 33, the combination of the first protruding rib 3311 and multiple first protrusions 3312 allows for more dispersed and uniform force distribution on panel 33.

[0101] In some embodiments, the ratio of the length of the first rib 3311 to the length of the panel 33 is greater than or equal to 0.7, thereby improving the rigidity of the panel 33 in the length direction by using a sufficiently long first rib 3311.

[0102] For example, the ratio of the length of the first rib 3311 to the length of the panel 33 is 0.7, 0.74, 0.76, 0.799, 0.8, 0.85, 0.869, 0.88, 0.892, 0.91, 0.95 or 1, and this application embodiment does not limit this.

[0103] In some embodiments, on at least one side of the width direction of the first rib 3311, the first protrusions 3312 are arranged along the length direction of the first rib 3311, and the first protrusions 3312 are all spaced apart from the first rib 3311, so as to form a first groove 332 between the first rib 3311 and the plurality of first protrusions 3312, and a second groove 333 is formed between two adjacent first ribs 3311. One end of the second groove 333 communicates with the first groove 332, and the other end of the second groove 333 communicates with the outer periphery of the panel 33.

[0104] Therefore, it can also be understood that the first protrusion 331 defines a drain groove on the side of the panel 33 away from the buffer layer 32, so as to avoid some liquid flowing onto the upper surface of the panel 33 during the assembly process or subsequent use, thereby causing a safety hazard to the battery pack. The drain groove includes a first groove 332 and a second groove 333.

[0105] In some embodiments, the first protrusion 331 further includes a second rib 3313, and each side edge of the panel 33 along its length is provided with a second rib 3313. Each end of the first rib 3311 is connected to one of the second ribs 3313 on one side. A first protrusion 3312 is located between the two second ribs 3313 on both sides. Thus, it can be understood that when the panel 33 is stepped on, the panel 33 usually deforms more at its edges. Therefore, the cooperation of the second rib 3313 and the first rib 3311 can improve the strength at the edges of the panel 33.

[0106] In some embodiments, the side surface of panel 33 facing the buffer layer 32 has the same shape as the side surface of buffer layer 32 facing panel 33, so that all parts of panel 33 can contact buffer layer 32, so that all parts of panel 33 can be well supported and buffered by buffer layer 32, and the force on panel 33 can be evenly transmitted to lid 31 through buffer layer 32.

[0107] For example, the buffer layer 32 has a second protrusion 321 on the side surface facing the panel 33, and the shape of the second protrusion 321 matches the shape of the first protrusion 331 so as to be embedded in the side of the first protrusion 331 facing the buffer layer 32.

[0108] In some embodiments, the thickness of the buffer layer 32 is D1, and the sum of the thicknesses of the lid 31, the buffer layer 32, and the panel 33 is D2. The ratio of D1 to D2 is greater than or equal to 2:3, that is, the ratio of D1 to D2 is greater than or equal to two-thirds, thereby avoiding the buffer layer 32 from being too thin and ensuring that the lid assembly 300 has sufficient cushioning effect.

[0109] In some implementations, the ratio of D1 to D2 is less than or equal to 7:8, that is, the ratio of D1 to D2 is less than or equal to seven-eighths, thereby avoiding the buffer layer 32 being too thick to prevent a decrease in the energy density of the battery pack.

[0110] For example, the ratio of D1 to D2 can be 2:3, 3:4, 4:5, 5:6, 6:7 or 7:8, but this application does not limit this.

[0111] In some embodiments, the thickness of the buffer layer is D1, and the thickness of the lid is D3. The ratio of D1 to D3 is greater than or equal to 4, thereby preventing the buffer layer 32 from being too thin and ensuring that the lid assembly 300 has sufficient cushioning effect.

[0112] In some implementations, the ratio of D1 to D3 is less than or equal to 15, thereby preventing the buffer layer 32 from being too thick and thus avoiding a decrease in the energy density of the battery pack.

[0113] For example, the ratio of D1 to D3 can be 4, 4.5, 5, 5.7, 6, 6.9, 8, 9.5, 10.01, 11, 12.3, 13.8, 14, 14.5 or 15, and the embodiments of this application do not limit this.

[0114] The above are some examples of the panel 33 in the embodiments of this application. The technical solutions of the embodiments of this application will be further illustrated below with reference to the structure of the housing 100.

[0115] Please continue to refer to this. Figure 6 In some embodiments, the number of battery cell assemblies 200 is multiple, and the housing 100 includes multiple sub-housings 11, which are stacked along a first direction H1. Each sub-housing 11 contains at least one battery cell assembly 200. Thus, by stacking multiple sub-housings 11, the number of battery cell assemblies 200 within the battery pack can be increased, thereby improving the energy storage capacity of the battery pack. Furthermore, by installing portions of battery cell assemblies 200 in multiple housings 100 respectively, each housing 100 and its corresponding battery cell assembly 200 can form a small unit or module during assembly, thereby reducing the installation difficulty of each small unit or module. Finally, multiple small units or modules can be assembled, reducing the assembly difficulty of a large number of battery cell assemblies 200.

[0116] In some embodiments, at least one sub-box 11 located at the outermost end along the first direction H1 is provided with a box cover assembly 300. Thus, during installation, installers can easily step onto the panel 33 of the box cover assembly 300 to assemble multiple small units or modules.

[0117] Please continue to refer to this. Figure 7 In some embodiments, the battery pack also includes at least one connecting plate 400, and the outer walls of two adjacent sub-boxes 11 are connected by the connecting plate 400. Thus, the stability and reliability of the connection between two adjacent sub-boxes 11 can be improved by the connecting plate 400.

[0118] The connecting plate 400 and the sub-box 11 can be fixed by bolts, rivets, or welding. This application embodiment does not limit the specific method of fixing them together.

[0119] In some embodiments, the outer wall of the sub-box 11 is provided with a fixing ear 12, and the fixing ears 12 of two adjacent sub-boxes 11 are connected and fixed, thereby improving the stability and reliability of the connection between two adjacent sub-boxes 11.

[0120] The fixing ears 12 can be fixed by bolts, rivets, or welding. This application embodiment does not limit the specific method of fixing them.

[0121] In some embodiments, one of the two adjacent fixing ears 12 is provided with a second positioning post 121 and the other is provided with a second positioning hole 122. The second positioning post 121 passes through the second positioning hole 122 to improve the positional accuracy of the installation of the two adjacent sub-boxes 11.

[0122] In some embodiments, a connecting plate 400 is connected to at least one side of the outer wall of the sub-box 11 along the second direction H2, and a fixing lug 12 protrudes from at least one side of the outer wall of the sub-box 11 along the third direction H3. The first direction H1, the second direction H2, and the third direction H3 are perpendicular to each other.

[0123] For example, the first direction H1 can be the height direction of the battery pack, the second direction H2 can be the width direction of the battery pack, and the third direction H3 can be the length direction of the battery pack, so that each side surface of two adjacent sub-boxes 11 can be stably and reliably connected and fixed. Of course, the specific directions of the first direction H1, the second direction H2, and the third direction H3 can be interchanged, and this application embodiment does not limit this.

[0124] Please continue to refer to this. Figure 8In some embodiments, the battery pack further includes a first heat exchange component 51. The first heat exchange component 51 covers the cell assembly 200 for heat exchange with the cell assembly 200.

[0125] In some embodiments, the first heat exchange component 51 may include a first liquid cooling plate having a first cooling channel for the flow of a cooling medium (e.g., coolant), thereby cooling the battery cell assembly 200 through the first liquid cooling plate.

[0126] In some embodiments, the first liquid cooling plate may include a sheet metal part. For example, the first liquid cooling plate may be a stamped sheet metal assembly, thereby giving the first liquid cooling plate the advantages of low cost and ease of manufacture.

[0127] In some embodiments, the first heat exchange component 51 may be bonded to the cell assembly 200. For example, the cell assembly 200 may also include an integrated busbar (Cells Contact System, CCS). The integrated busbar is electrically connected to a plurality of cells 21. The first heat exchange component 51 may be bonded to the integrated busbar using thermally conductive adhesive or the like.

[0128] Of course, in some other embodiments, the first heat exchange component 51 may also include a first heating film for heating the battery cell assembly 200, and this application embodiment does not limit this.

[0129] Please continue to refer to this. Figure 9 In some embodiments, the battery pack further includes a second heat exchange component 52. The second heat exchange component 52 covers the side of the cell assembly 200 opposite to the first heat exchange component 51.

[0130] For example, the first heat exchange component 51 can be placed on the top of the battery cell assembly 200, and the second heat exchange component 52 can be placed on the bottom of the battery cell assembly 200, so that the top and bottom of the battery cell assembly 200 have a better temperature control effect, and the temperature of the battery cell assembly 200 is more uniform and controllable.

[0131] In some embodiments, the second heat exchange component 52 may include a second liquid cooling plate, which has a second cooling channel for the flow of a cooling medium (e.g., coolant) so that the cell assembly 200 can be cooled by the second liquid cooling plate.

[0132] Of course, in some other embodiments, the second heat exchange component 52 may also include a second heating film for heating the battery cell assembly 200, and this application embodiment does not limit this.

[0133] In some embodiments, each of the battery cell assembly 200 is equipped with a first heat exchange component 51 and / or a second heat exchange component 52, which can improve the temperature control effect of all battery cell assemblies 200 in the battery pack, so that the temperature of the battery cell assembly 200 in various parts of the battery pack is more uniform and controllable.

[0134] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A battery pack, characterized in that, include: A housing having a receiving space and an opening communicating with the receiving space; A battery cell assembly, comprising a plurality of battery cells, wherein the battery cell assembly is disposed within the accommodating space; as well as, A box lid assembly includes a box lid, a buffer layer, a panel, a support member, a first fastener, and a second fastener. The box lid is connected to the box body to close the opening. The buffer layer is located on the side of the box lid facing away from the receiving space, and the buffering performance of the buffer layer is greater than that of the box lid. The panel is located on the side of the buffer layer facing away from the box lid, and the rigidity of the panel is greater than that of the buffer layer. The support member connects the box lid and the panel, and the rigidity of the support member is greater than that of the buffer layer. The support member includes multiple first segments and multiple fasteners facing the box lid. A recessed connecting portion is provided in the direction of the lid. The first segment and the connecting recess are arranged at intervals along the length direction of the support member. The connecting recess includes a second segment and a plurality of third segments. The second segment is connected to the lid. One end of each third segment is bent and connected to the adjacent second segment. The other end of each third segment is bent and connected to the adjacent first segment. A first fastener connects the lid and the box body. At least a portion of the first fastener is also inserted through the connecting recess to fix the connecting recess to the lid. A second fastener connects the first segment and the panel.

2. The battery pack according to claim 1, characterized in that, The number of the support members is at least two, and the support members are provided on each side of the width direction of the buffer layer and / or on each side of the length direction of the buffer layer.

3. The battery pack according to claim 1, characterized in that, In the same support member, a plurality of connecting recesses are arranged along the edge of the cover, with a spacing of 80 mm to 100 mm between adjacent connecting recesses, and each connecting recess is fitted with a first fastener; and / or, In the same support member, a plurality of connecting recesses are arranged along the edge of the box cover, the distance between two adjacent connecting recesses is 80 mm to 100 mm, and no first fastener is provided between two adjacent connecting recesses.

4. The battery pack according to claim 1, characterized in that, The lid assembly further includes a third fastener, which passes through the panel and the lid and is connected to the box body to fix both the panel and the lid to the box body.

5. The battery pack according to claim 1, characterized in that, The panel has a reinforcing structure.

6. The battery pack according to claim 5, characterized in that, The reinforcing structure includes a first protrusion that protrudes away from the buffer layer. The first protrusion includes a first rib and a plurality of first protrusions. The first rib extends along the length of the panel, and a plurality of first protrusions are arranged on each side of the width of the first rib.

7. The battery pack according to claim 6, characterized in that, At least one side of the width direction of the first rib, the first protrusions are arranged along the length direction of the first rib, and the first protrusions are spaced apart from the first ribs to form a first groove between the first ribs and the plurality of first protrusions, and a second groove is formed between two adjacent first ribs. One end of the second groove is connected to the first groove, and the other end of the second groove is connected to the outer periphery of the panel.

8. The battery pack according to claim 6, characterized in that, The first protrusion also includes a second rib, and each edge of the panel along its length is provided with a second rib; Each end of the first rib is connected to the second rib on one side; The first convex bulge is located between the second convex ribs on both sides.

9. The battery pack according to claim 5, characterized in that, The shape of the side surface of the panel facing the buffer layer matches the shape of the side surface of the buffer layer facing the panel.

10. The battery pack according to claim 1, characterized in that, The thickness of the buffer layer is D1, and the sum of the thicknesses of the lid, the buffer layer, and the panel is D2. The ratio of D1 to D2 is 2:3 to 7:

8.

11. The battery pack according to any one of claims 1 to 10, characterized in that, The thickness of the buffer layer is D1, and the thickness of the box cover is D3. The ratio of D1 to D3 is 4 to 15.

12. The battery pack according to any one of claims 1 to 10, characterized in that, The buffer cover is located at only one end of the box cover along its length.

13. The battery pack according to any one of claims 1 to 10, characterized in that, The number of battery cell assemblies is multiple, the housing includes multiple sub-housings, the multiple sub-housings are stacked along a first direction, and each sub-housing is provided with at least one battery cell assembly; Along the first direction, at least one of the sub-boxes located at the outermost end is provided with a box cover assembly.

14. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 13.

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