Battery pack and electric equipment

Abstract

The invention provides a battery pack and electric equipment. The battery pack comprises a box body, a battery cell assembly and a box cover assembly, the box body is provided with an accommodating space and an opening communicated with the accommodating space; the battery cell assembly comprises a plurality of battery cells, and the battery cell assembly is arranged in the accommodating space; the box cover assembly comprises a box cover and a buffer layer, the box cover is connected with the box body to seal the opening, the buffer layer is arranged on the side, away from the containing space, of the box cover, and the buffer performance of the buffer layer is larger than that of the box cover. According to the battery pack provided by the embodiment of the invention, the box cover is buffered through the buffer layer in the mounting process, so that the box cover is not easy to damage.

Description

Technical Field

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

[0002] The battery pack mainly includes a box body and multiple battery cells encapsulated in the box body.

[0003] In the related art, some battery packs are relatively large in size. During the installation process, the installer may step on the cover of the battery pack, causing the cover to deform or even break, thereby posing a safety hazard to the battery pack. Summary of the invention

[0004] The embodiments of the present invention provide a battery pack and an electrical device, which can improve the technical problem that the box cover of the battery pack is easily deformed or even broken during the installation process.

[0005] In a first aspect, an embodiment of the present invention provides a battery pack, comprising:

[0006] A box body, the box body having a containing space and an opening communicating with the containing space;

[0007] A battery cell assembly, the battery cell assembly comprising a plurality of battery cells, the battery cell assembly being arranged in the accommodation space; and

[0008] A box cover assembly, the box cover assembly comprises a box cover and a buffer layer, the box cover is connected to the box body to close the opening, the buffer layer is arranged on a side of the box cover away from the accommodating space, and the buffering performance of the buffer layer is greater than the buffering performance of the box cover.

[0009] In one embodiment, the box cover assembly further includes a panel, which is disposed on a side of the buffer layer facing away from the box cover, and the rigidity of the panel is greater than the rigidity of the buffer layer.

[0010] In one embodiment, the box cover assembly further includes a support member, wherein the support member is connected between the box cover and the panel, and the rigidity of the support member is greater than the rigidity of the buffer layer.

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

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

[0013] In one embodiment, the support member includes a plurality of first sections, and the first sections and the connecting recesses are arranged in an interval along the length direction of the support member;

[0014] The connecting recess includes a second section and a plurality of third sections, the second section is connected to the box cover, one end of each of the third sections is connected to the adjacent second section by a bending, and the other end of each of the third sections is connected to the adjacent first section by a bending.

[0015] In one embodiment, the box cover assembly further includes a first fastener, which connects the box cover and the box body; at least part of the first fastener is also inserted into the connecting recess, so that the connecting recess is fixed to the box cover; wherein,

[0016] In the same support member, a plurality of the 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 each connecting recess is penetrated by a first fastener; and / or,

[0017] In the same supporting 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-100 mm, and the first fastener is not arranged between two adjacent connecting recesses.

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

[0019] In an embodiment, the panel is provided with a reinforcement structure.

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

[0021] In one embodiment, on at least one side in the width direction of the first rib, the first bulges are arranged along the length direction of the first rib, and the first bulges are spaced apart from the first rib to form a first groove between the first rib and a plurality of the first bulges, 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 peripheral side of the panel.

[0022] In one embodiment, the first convex portion further includes a second convex rib, and each side edge of the panel in the length direction is provided with a second convex rib;

[0023] Wherein, each end of the first convex rib is connected to the second convex rib on one side;

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

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

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

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

[0028] In one embodiment, the buffer layer cover is only disposed at one end of the box cover along the length direction.

[0029] In one embodiment, the number of the box and the battery cell assembly is multiple, each box is provided with the battery cell assembly, and the multiple boxes are stacked along the first direction;

[0030] Along the first direction, at least one box body located at the outermost end is provided with a box cover assembly installed.

[0031] In a second aspect, an embodiment of the present invention provides an electrical device, comprising a battery pack as described above.

[0032] Beneficial effects of the embodiments of the present invention:

[0033] In an embodiment of the present invention, the box cover assembly can close the opening of the box body by connecting the box cover and the box body; on this basis, the box cover assembly provides a buffer layer on the side of the box cover facing away from the accommodating space, so that the installer can step on the buffer layer of the box cover assembly for installation, so that the buffer layer provides a better buffering effect, thereby avoiding deformation or even damage of the box cover, and ultimately improving the technical problem that the box cover of the battery pack is easily deformed or even broken during the installation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the 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 work.

[0035] Figure 1A schematic structural diagram of a battery pack provided in an embodiment of the present invention.

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

[0037] Figure 3 for Figure 2 Schematic diagram of the structure of the box cover assembly of the battery pack shown.

[0038] Figure 4 for Figure 3 A schematic structural diagram of the support member of the box cover assembly shown.

[0039] Figure 5 for Figure 3 Exploded view of the tank cover assembly shown.

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

[0041] Figure 7 for Figure 1 A partial enlarged view of the X in the figure.

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

[0043] Fig. 9 for Figure 1 A schematic structural diagram of the second heat exchange component of the battery shown.

[0044] The numbers in the figure are:

[0045] 100, box body; 11, sub-box body; 12, fixing ear; 121, second positioning column; 122, second positioning hole;

[0046] 200, battery cell assembly; 21, battery cell; 22, integrated busbar;

[0047] 300, box cover assembly; 31, box cover; 32, buffer layer; 321, second convex portion; 33, panel; 331, first convex portion; 3311, first convex rib; 3312, first convex bump; 3313, second convex 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. a first heat exchange component; 52. a second heat exchange component;

[0050] H1, first direction; H2, second direction; H3, third direction. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0052] The battery pack mainly includes a box body and multiple battery cells encapsulated in the box body.

[0053] In the related art, some battery packs are relatively large in size. During the installation process, the installer may step on the battery pack cover, which may cause the battery pack cover to deform or even rupture, thus causing safety hazards in the battery pack. For example, the deformation and rupture of the cover may affect the airtightness inside the battery pack; or, when the deformation of the cover is too large, the distance between the cover and the battery cell may be too small after deformation, and the insulation between the battery cell and the cover may fail easily.

[0054] Based on this, the embodiments of the present application provide a battery pack and an electrical device to improve the technical problem that the box cover of the battery pack is easily deformed or even broken during the installation process.

[0055] The battery pack can be applied to electrical equipment. Electrical equipment can be but is not limited to means of transportation, smart wearable devices, mobile terminals, household appliances and medical devices, which are not limited to the embodiments of the present application. Means of transportation include but are not limited to cars, buses, trains, ships, flight equipment, etc. Smart wearable devices include but are not limited to smart watches, smart bracelets, cervical massagers, etc. Mobile terminals include but are not limited to smart phones, laptops, tablets, POS (point of sale terminals). Household appliances include but are not limited to televisions, washing machines, air conditioners, rice cookers, smart sweepers, smart lights, etc. Medical devices include but are not limited to infrared electronic thermometers, pulse oximeters, human body composition analyzers, etc. Of course, the battery pack can also be used for energy storage devices, which are not limited to the embodiments of the present application.

[0056] Please refer to Figure 1 , Figure 2 and Figure 3 The battery pack includes a case 100, a battery cell assembly 200 and a case cover assembly 300. The case 100 has a storage space and an opening connected to the storage space. The battery cell assembly 200 includes a plurality of battery cells 21, and the battery cell assembly 200 is arranged in the storage space. The case cover assembly 300 includes a case cover 31 and a buffer layer 32, and the case cover 31 is connected to the case 100 to close the opening of the case 100. The buffer layer 32 is arranged on the side of the case cover 31 away from the storage space, and the buffer performance of the buffer layer 32 is greater than the buffer performance of the case cover 31.

[0057] Therefore, during the installation process, the installer can step on the buffer layer 32 of the box cover assembly 300 for installation, so that the buffer layer 32 provides a better buffering effect, thereby avoiding deformation or even damage of the box cover 31, and ultimately improving the technical problem that the box cover 31 of the battery pack is easily deformed or even broken during the installation process.

[0058] It should be noted that the buffering performance of the buffer layer 32 is greater than that of the box cover 31, which can be understood as the buffer layer 32 being easier to deform than the box cover 31. Therefore, when a user steps on the buffer layer 32 of the box cover assembly 300, the buffer layer 32 may deform before the box cover 31, and then the buffer layer 32 provides buffering for the box cover 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 having a buffering effect, such as an elastic rubber layer, which is not limited in the embodiments of the present application.

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

[0061] Then, during the installation process, the user may step on the panel 33. At this time, since the panel 33 is more rigid than the buffer layer 32, it is less likely to deform, so that the force acting on the panel 33 can be dispersedly transmitted to various parts of the buffer layer 32 through the panel 33, so that the buffer layer 32 and the panel 33 can cooperate with each other to provide better buffering and supporting effects, so as to avoid deformation or even damage of the box cover 31.

[0062] The panel 33 may be a metal part, a hard plastic part, etc., so that the rigidity of the panel 33 is greater than the rigidity of the buffer layer 32, which is not limited in the embodiment of the present application. For example, the panel 33 may be made of steel, such as high-strength steel of DP780 or the like, and of course the metal part may also be made of iron or alloy material, which is not limited in the embodiment of the present application.

[0063] In some embodiments, the box cover assembly 300 further includes a support member 34. The support member 34 is connected between the box cover 31 and the panel 33, and the rigidity of the support member 34 is greater than the rigidity of the buffer layer 32. Therefore, when the installer steps on the panel 33, on the one hand, the buffer layer 32 and the panel 33 can deform adaptively to provide a better buffering effect, thereby avoiding damage to the box cover assembly 300; on the other hand, the support member 34 can provide a better supporting effect on the corresponding part of the panel 33, so as to avoid the panel 33 and the buffer layer 32 from deforming too much, which may cause the installer to step on the unstable state.

[0064] The support member 34 may include a metal member, a hard plastic member, etc., which is not limited in the present embodiment. For example, the metal member may be made of steel, such as high-strength steel of DP780 or the like, and of course the metal member may also be made of iron or alloy material, which is not limited in the present embodiment.

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

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

[0067] Exemplarily, a support member 34 is disposed on each side of the buffer layer 32 in a width direction and / or each side of the buffer layer 32 in a length direction.

[0068] It should be noted that in the embodiment of the present application, "and / or" describes the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In other words, it is possible that a support member 34 is provided on each side of the buffer layer 32 in the width direction, and no support member 34 is provided on each side of the buffer layer 32 in the length direction; it is also possible that no support member 34 is provided on each side of the buffer layer 32 in the width direction, and a support member 34 is provided on each side of the buffer layer 32 in the length direction; it is also possible that a support member 34 is provided on each side of the buffer layer 32 in the width direction, and a support member 34 is provided on each side of the buffer layer 32 in the length direction. The embodiment of the present application does not limit this.

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

[0070] Of course, in some other implementations, the number of the support member 34 may also be one, which is not limited in the embodiment of the present application.

[0071] In some embodiments, the support member 34 is connected and fixed to the panel 33 , so it can also be understood that the support member 34 is installed on the panel 33 to avoid displacement and falling off 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 box cover 31. Therefore, it can also be understood that the support member 34 is installed on the box cover 31 to prevent the panel 33 from shifting and falling off, thereby ensuring the stability and reliability of the box cover assembly 300.

[0073] It can also be understood that when the support members 34 are respectively connected to the panel 33 and the box cover 31, if a support member 34 is provided on each side of the buffer layer 32 in the width direction and / or each side of the buffer layer 32 in the length direction, 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 toward the box cover 31; at this time, the support members 34 can limit the warping amplitude of the panel 33 located on both sides of the length direction and / or width direction of the buffer layer 32 to avoid excessive deformation of the panel 33, and it can also be understood that the support members 34 pull the parts of the panel 33 located on both sides of the length direction and / or width direction of the buffer layer 32, so that the overall force on the panel 33 is more uniform and dispersed, thereby improving the stability and reliability of the box cover assembly 300.

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

[0075] The support member 34 may be a plate member. For example, the support member 34 is a sheet metal member formed by bending, stamping, drawing, etc., so as to form a plurality of connecting recesses 341 .

[0076] Exemplarily, the support member 34 includes a plurality of first segments 342, and the first segments 342 and the connecting recess 341 are arranged at intervals along the length direction of the support member 34. The connecting recess 341 includes a second segment 3411 and a plurality of third segments 3412, the second segment 3411 is connected to the box 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] Then, it can also be understood that the support member 34 forms a plurality of arch structures bent toward the box cover 31 through a plurality of second sections 3411 and a plurality of third sections 3412. Further, on the basis that the support member 34 is thin and light to reduce the weight of the battery pack, the embodiment of the present application 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 Figure 5 In some embodiments, the box cover assembly 300 further includes a first fastener 35. The first fastener 35 connects the box cover 31 and the box body 100, so that the box cover 31 can be stably and reliably mounted to the box body 100.

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

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

[0081] Therefore, on the one hand, it can avoid that the spacing between two adjacent connecting recesses 341 is too large, which leads to insufficient strength of the support member 34; on the other hand, it can also avoid that the spacing between two adjacent connecting recesses 341 is too small, which leads to more processing steps and greater processing difficulty of the support member 34.

[0082] For example, the spacing 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, which is not limited to the embodiments of the present application.

[0083] In some embodiments, in the same support member 34, each connecting recess 341 is penetrated by a first fastener 35, so as to avoid the first fasteners 35 being spaced too far apart, thereby preventing the stability of the connection between the box cover 31 and the box body 100 from being reduced, and the airtightness between the box cover 31 and the box body 100 from being reduced.

[0084] In some embodiments, in the same support member 34, no first fastener 35 is provided between two adjacent connecting recesses 341, thereby avoiding too many first fasteners 35 being provided due to too small a spacing between the first fasteners 35, and ultimately avoiding greater difficulty and higher cost in assembling the box cover assembly 300.

[0085] In some embodiments, at the same side edge of the box body 100, the number of first sections 342 between two adjacent first fasteners 35 is less than or equal to 1, thereby avoiding too many first fasteners 35 being arranged due to too small a spacing between the first fasteners 35, and ultimately avoiding greater difficulty in assembling the box cover assembly 300.

[0086] The first fastener 35 may be a fastening screw, such as a fastening screw of size M5. Of course, the first fastener 35 may also be a rivet, etc., which is not limited in the embodiment of the present application.

[0087] In some embodiments, the box cover assembly 300 may further include a second fastener 36, which connects the first section 342 and the panel 33. The second fastener 36 may be a fastening screw, such as a fastening screw of M5 size, and of course the first fastener 35 may also be a rivet, etc., which is not limited in the embodiment of the present application.

[0088] In some embodiments, the box cover assembly 300 may further include a third fastener, which is disposed through the panel 33 and the box cover 31 and connected to the box body 100, so as to fix both the panel 33 and the box cover 31 to the box body 100. Therefore, it can also be understood that the third fastener is used to connect and fix the panel 33 to the box body 100 on the basis of connecting and fixing the box cover 31 to the box body 100, so as to reduce the number of parts of the box cover assembly 300, thereby reducing the manufacturing and assembly difficulty of the box cover assembly 300.

[0089] Exemplarily, the third fastener may be inserted through the panel 33, the connecting recess 341 and the box cover 31 and connected to the box body 100, so that the panel 33, the support member 34 and the box cover 31 are all locked and fixed to the box body 100. Then, it can also be understood that at least a part of the first fastener 35 forms the third fastener.

[0090] Exemplarily, the third fastener may be disposed through the panel 33, the first section 342 and the box cover 31 and connected to the box body 100, so that the panel 33, the support member 34 and the box cover 31 are all locked and fixed to the box body 100. Then, it can also be understood that at least a part of the second fastener 36 forms the third fastener.

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

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

[0093] Exemplarily, the thickness of the support member 34 may 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, which is not limited in the embodiments of the present application.

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

[0095] In some embodiments, the buffer layer 32 is only provided at one end of the box cover 31 along the length direction. Therefore, by only providing the buffer layer 32 and the panel 33 at one end of the box cover 31 along the length direction, it can not only meet the installation personnel's stepping requirements during the installation process, but also reduce the consumables of the buffer layer 32 and the panel 33, so as to reduce the overall weight and manufacturing cost of the battery pack.

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

[0097] For example, the reinforcing structure includes a first protrusion 331 protruding in a direction away from the buffer layer 32. The height of the first protrusion 331 can be 2 mm to 3 mm, thereby avoiding the first protrusion 331 being too small and resulting in insufficient rigidity of the first protrusion 331, and avoiding the first protrusion 331 being too large and resulting in a decrease in the energy density of the battery pack.

[0098] Exemplarily, the height of the first convex hump 3312 may 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, which is not limited in the embodiments of the present application.

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

[0100] It is understandable that as the length of the panel 33 increases, the rigidity of each location in the length direction of the panel 33 will decrease relatively, so the first rib 3311 extending along the length direction of the panel 33 can make the rigidity of each location in the length direction of the panel 33 higher. On this basis, the rigidity of each location in the width direction of the panel 33 can be ensured to be higher through the multiple first convex bumps 3312. Furthermore, when the installer steps on the panel 33, the force on the panel 33 can be more dispersed and uniform through the combination of the first rib 3311 and the multiple first convex bumps 3312.

[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, so that the rigidity of the panel 33 at various locations along the length direction can be improved by having 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, which is not limited to this embodiment of the present application.

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

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

[0105] In some embodiments, the first convex portion 331 further includes a second convex rib 3313, and each side edge of the panel 33 in the length direction is provided with a second convex rib 3313. Each end of the first convex rib 3311 is connected to the second convex rib 3313 on one side. The first convex bump 3312 is located between the second convex ribs 3313 on both sides. Therefore, it can be understood that when the panel 33 is stepped on, the panel 33 is usually deformed at the edges around it, so the strength of the edge of the panel 33 can be improved by the cooperation of the second convex rib 3313 and the first convex rib 3311.

[0106] In some embodiments, the surface of one side of the panel 33 facing the buffer layer 32 has the same shape as the surface of the one side of the buffer layer 32 facing the panel 33, so that each part of the panel 33 can be in contact with the buffer layer 32, so that each part of the panel 33 can be better supported and buffered by the buffer layer 32, and the force applied to the panel 33 can be evenly transferred to the box cover 31 through the buffer layer 32.

[0107] For example, a second convex portion 321 is disposed on a surface of the buffer layer 32 facing the panel 33 . The shape of the second convex portion 321 matches that of the first convex portion 331 , so as to be embedded in the side of the first convex portion 331 facing the buffer layer 32 .

[0108] In some embodiments, the thickness of the buffer layer 32 is D1, the sum of the thicknesses of the box cover 31, the buffer layer 32 and the panel 33 is D2, and 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 preventing the buffer layer 32 from being too thin, thereby ensuring that the box cover assembly 300 has sufficient buffering effect.

[0109] In some embodiments, 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 preventing the buffer layer 32 from being too thick and thus preventing the energy density of the battery pack from being reduced.

[0110] For example, the ratio of D1 to D2 is 2:3, 3:4, 4:5, 5:6, 6:7 or 7:8, which is not limited in the embodiments of the present application.

[0111] In some embodiments, the thickness of the buffer layer is D1, and the thickness of the box cover is D3. The ratio of D1 to D3 is greater than or equal to 4, so that the buffer layer 32 can be prevented from being too thin, so as to ensure that the box cover assembly 300 has sufficient buffering effect.

[0112] In some embodiments, the ratio of D1 to D3 is less than or equal to 15, so as to avoid the buffer layer 32 being too thick and thus avoid reducing the energy density of the battery pack.

[0113] For example, the ratio of D1 to D3 may 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, which is not limited to the embodiments of the present application.

[0114] The above are some examples of the panel 33 in the embodiment of the present application. The following will continue to illustrate the technical solution of the embodiment of the present application in combination with the structure of the box 100.

[0115] Please continue to refer to Figure 6 In some embodiments, the number of the battery cell assemblies 200 is multiple, and the box 100 includes multiple sub-boxes 11, and the multiple sub-boxes 11 are stacked along the first direction H1, and each sub-box 11 is provided with at least one battery cell assembly 200. Therefore, by stacking multiple sub-boxes 11, the number of battery cell assemblies 200 in the battery pack can be increased to improve the energy storage capacity of the battery pack; and by installing part of the battery cell assemblies 200 in multiple boxes 100 respectively, each box 100 and the corresponding battery cell assembly 200 can form a small unit or a small module during the assembly process, so that the installation difficulty of each small unit or a small module is reduced, and finally, multiple small units or small modules can be assembled to reduce the assembly difficulty of a large number of battery cell assemblies 200.

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

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

[0118] The connecting plate 400 and the sub-box 11 may be screwed and fixed by bolts, riveted and fixed by rivets, or welded and fixed, which is not limited in the embodiment of the present application.

[0119] In some embodiments, a fixing ear 12 is protruding from the outer wall of the sub-box 11 , and the fixing ears 12 of two adjacent sub-boxes 11 are connected and fixed, so that the stability and reliability of the connection between the two adjacent sub-boxes 11 can be improved by the fixing ears 12 .

[0120] The fixing ears 12 may be screwed and fixed by bolts, riveted and fixed by rivets, or welded and fixed, which is not limited in the embodiment of the present application.

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

[0122] In some embodiments, the outer wall of the sub-box 11 is connected to a connecting plate 400 on at least one side along the second direction H2, and the outer wall of the sub-box 11 is provided with a fixing ear 12 on at least one side 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 may be the height direction of the battery pack, the second direction H2 may be the width direction of the battery pack, and the third direction H3 may 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 are interchangeable, and this embodiment of the present application does not limit this.

[0124] Please continue to refer to Figure 8In some embodiments, the battery pack further includes a first heat exchange component 51. The first heat exchange component 51 is disposed on the battery cell assembly 200 to exchange heat with the battery 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 a cooling medium (eg, coolant) to flow, so that the battery cell assembly 200 may be cooled by the first liquid cooling plate.

[0126] In some embodiments, the first liquid cooling plate may include a sheet metal component. For example, the first liquid cooling plate may be a sheet metal component formed by stamping, so that the first liquid cooling plate has the advantages of low cost and easy manufacturing.

[0127] In some embodiments, the first heat exchange component 51 can be bonded and fixed to the battery cell assembly 200. For example, the battery cell assembly 200 can also include an integrated busbar (Cells Contact System, CCS). The integrated busbar is electrically connected to the plurality of battery cells 21. The first heat exchange component 51 can be bonded and fixed to the integrated busbar by thermal 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 , which is not limited in this embodiment of the present application.

[0129] Please continue to refer to Fig. 9 In some embodiments, the battery pack further includes a second heat exchange component 52. The second heat exchange component 52 is disposed on a side of the battery cell assembly 200 away from the first heat exchange component 51.

[0130] For example, the first heat exchange component 51 may be covered on the top of the battery cell assembly 200, and the second heat exchange component 52 may be covered on the bottom of the battery cell assembly 200, so that both the top and the bottom of the battery cell assembly 200 have a better temperature control effect, so that the temperature of each part 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 having a second cooling channel for a cooling medium (eg, coolant) to flow, so that the battery cell assembly 200 may 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 , which is not limited in the embodiment of the present application.

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

[0134] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery pack, characterized in that: include: A box body, the box body having a containing space and an opening communicating with the containing space; A battery cell assembly, the battery cell assembly comprising a plurality of battery cells, the battery cell assembly being arranged in the accommodation space; as well as, A box cover assembly, the box cover assembly comprises a box cover and a buffer layer, the box cover is connected to the box body to close the opening, the buffer layer is arranged on a side of the box cover away from the accommodating space, and the buffering performance of the buffer layer is greater than the buffering performance of the box cover.

2. The battery pack according to claim 1, characterized in that: The box cover assembly further comprises a panel, which is arranged on a side of the buffer layer away from the box cover, and the rigidity of the panel is greater than the rigidity of the buffer layer.

3. The battery pack according to claim 2, characterized in that: The box cover assembly further includes a support member connected between the box cover and the panel, and the rigidity of the support member is greater than the rigidity of the buffer layer.

4. The battery pack according to claim 3, characterized in that: The number of the support members is at least two, and the support members are disposed on each side of the buffer layer in a width direction and / or each side of the buffer layer in a length direction.

5. The battery pack according to claim 3, characterized in that: The support member is bent and includes a plurality of connection recesses that are recessed toward the box cover, and the connection recesses are connected and fixed to the box cover.

6. The battery pack according to claim 5, characterized in that: The support member includes a plurality of first sections, wherein the first sections and the connecting recesses are arranged in an interval arrangement along the length direction of the support member; The connecting recess includes a second section and a plurality of third sections, the second section is connected to the box cover, one end of each of the third sections is connected to the adjacent second section by a bending, and the other end of each of the third sections is connected to the adjacent first section by a bending.

7. The battery pack according to claim 6, characterized in that: The box cover assembly further includes a first fastener, which connects the box cover and the box body; at least part of the first fastener is also inserted into the connecting recess, so that the connecting recess is fixed to the box cover; wherein, 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 each connecting recess is penetrated by a first fastener; and / or, In the same supporting 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-100 mm, and the first fastener is not arranged between two adjacent connecting recesses.

8. The battery pack according to claim 2, characterized in that: The box cover assembly further includes a third fastener, which is passed through the panel and the box cover and connected to the box body to fix the panel and the box cover to the box body.

9. The battery pack according to claim 2, characterized in that: The panel is provided with a reinforcement structure.

10. The battery pack according to claim 9, characterized in that: The reinforcing structure includes a first convex portion protruding in a direction away from the buffer layer, the first convex portion includes a first convex rib and a plurality of first convex bumps, the first convex rib extends along the length direction of the panel, and a plurality of first convex bumps are arranged on each side of the first convex rib in the width direction.

11. The battery pack according to claim 10, characterized in that: On at least one side of the first convex rib in the width direction, the first bulges are arranged along the length direction of the first convex rib, and the first bulges are spaced apart from the first convex rib to form a first groove between the first convex rib and multiple first bulges, 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 peripheral side of the panel.

12. The battery pack according to claim 10, characterized in that: The first convex portion further includes a second convex rib, and each side edge of the panel in the length direction is provided with a second convex rib; Wherein, each end of the first convex rib is connected to the second convex rib on one side; The first convex bulge is located between the second convex ribs on both sides.

13. The battery pack according to claim 9, characterized in that: A surface of one side of the panel facing the buffer layer matches in shape with a surface of one side of the buffer layer facing the panel.

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

8.

15. The battery pack according to any one of claims 1 to 14, characterized in that: The thickness of the buffer layer is D1, the thickness of the box cover is D3, and the ratio of D1 to D3 is 4 to 15.

16. The battery pack according to any one of claims 1 to 14, characterized in that: The buffer layer cover is only arranged at one end of the box cover along the length direction.

17. The battery pack according to any one of claims 1 to 14, characterized in that: There are multiple battery cell assemblies, the box includes multiple sub-boxes, the multiple sub-boxes are stacked along a first direction, and each of the sub-boxes 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 installed.

18. An electrical equipment, characterized in that: Comprising a battery pack as claimed in any one of claims 1 to 17.

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