Battery and electric device

Abstract

The utility model discloses a battery and a power utilization device, and relates to the technical field of batteries. The battery comprises a battery cell assembly, an insulating film wrapping the outer surface of the battery cell assembly, a top cover assembly, an outer insulating layer and a shell, wherein the battery cell assembly is provided with a tab; the battery also comprises an electrode extraction assembly; the tabs are folded to the electrode leading-out assembly and are electrically connected with the electrode leading-out assembly; the lower surface and the top wall of the electrode lead-out assembly are insulated; the insulating film comprises a first insulating surface, a second insulating surface, a third insulating surface, a fourth insulating surface, a top insulating surface and a bottom insulating surface which can be folded into a hexahedron. The battery provided by the utility model can effectively reduce the space occupation of the bent part of the tab in the second direction; meanwhile, the top insulating surface of the insulating film can be used for insulating the electrode lead-out assembly and the top cover assembly, so that the use of lower plastic is avoided, and the overall second direction size of the battery can be effectively reduced. And the battery capacity can be improved, and the hot melting welding process of the insulating film and the lower plastic is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more specifically, to a battery. In addition, the present application also relates to an electrical device including the above battery. Background Art

[0002] Currently, an insulating film is provided inside the battery to effectively prevent the battery core from contacting the insulating surface at the bottom of the side wall of the housing. The insulating film wraps from the bottom of the battery core to the top of the battery core and coincides with the side surface of the battery core. After combination, the insulating film is in the shape of a cuboid with an opening at the upper part, and the upper opening of the insulating film is heat-melted with the lower plastic to completely wrap the wound core.

[0003] During the specific operation process, sufficient space needs to be reserved for the heat melting of the lower plastic. The thickness of the thickest part of the lower plastic is greater than or equal to 3.5 mm, which increases the size of the battery in the second direction as a whole.

[0004] In summary, how to provide a battery that can reduce the size of the battery in the second direction as a whole is an urgent problem to be solved by those skilled in the art at present. Utility Model Content

[0005] In view of this, the purpose of the present application is to provide a battery. By setting the insulating film and the electrode lead-out assembly, the setting of the lower plastic is avoided, and the size of the battery in the second direction as a whole is effectively reduced.

[0006] Another purpose of the present application is to provide an electrical device including the above battery.

[0007] In order to achieve the above purpose, the present application provides the following technical solutions:

[0008] A battery includes a battery core assembly, an insulating film wrapped on the outer surface of the battery core assembly, and a top cover assembly. The battery core assembly is provided with tabs; the battery core assembly includes a top wall, a bottom wall, a first side wall, a second side wall, a front wall, and a rear wall; the battery further includes an electrode lead-out assembly;

[0009] The insulating film includes a first insulating surface, a second insulating surface, a third insulating surface, a fourth insulating surface, a top insulating surface, and a bottom insulating surface that can be folded into a hexahedron. The first insulating surface is disposed on the outer surface of the front wall, the second insulating surface is disposed on the outer surface of the rear wall, the third insulating surface is disposed outside the first side wall, the fourth insulating surface is disposed outside the second side wall, the top insulating surface is disposed between the electrode lead-out assembly and the top cover assembly, and the bottom insulating surface is disposed outside the bottom wall.

[0010] Optionally, the tab is folded to the electrode lead-out assembly and electrically connected to the electrode lead-out assembly.

[0011] In the present solution, the electrical connection between the pole ear and the electrode lead-out assembly can be achieved by folding the pole ear onto the electrode lead-out assembly. At the same time, the height space formed by the bending of the pole ear when the pole ear is folded onto the electrode lead-out assembly can be used to accommodate the structure located at the lower side of the pole ear in the electrode lead-out assembly. Compared with the prior art method of butterfly welding the pole ear, the space occupied by the bending of the pole ear in the second direction can be effectively reduced.

[0012] Optionally, the electrode lead-out assembly comprises:

[0013] A bottom insulating member, a side of which faces the battery cell assembly and contacts the top wall;

[0014] A protection sheet, the protection sheet is arranged on a side of the bottom insulating member away from the top wall; the pole ear is folded to the upper surface of the protection sheet;

[0015] A connecting sheet is provided with a pole, and the connecting sheet is provided on a side of the protective sheet where the folded pole ear is provided; the pole is electrically connected to the pole ear through the connecting sheet;

[0016] A top insulating member, arranged on a side of the connecting sheet away from the protective sheet, the top insulating member being provided with a first through hole for the pole to pass through;

[0017] The top cover assembly is arranged on a side of the top insulating member facing away from the connecting piece.

[0018] Optionally, a groove is provided on a side of the bottom insulating member facing away from the top wall, and the protection sheet is arranged in the groove.

[0019] Optionally, the distance between the bottom surface of the groove and the surface where the bottom insulating member contacts the top wall is 0.2 mm-2 mm;

[0020] The thickness of the protective sheet is 0.2mm-1.5mm;

[0021] The thickness of the tab is 0.2mm-1.5mm;

[0022] The ratio of the thickness of the protection sheet to the thickness of the tab welded to the connection sheet is 0.1-10;

[0023] The thickness of the top insulating member is 0.2 mm to 2 mm;

[0024] The thickness of the insulating film is 0.02-1 mm.

[0025] Optionally, the top insulating surface is disposed between the top insulating member and the top cover assembly; or, the top insulating surface is disposed on a side of the top insulating member facing the connecting piece.

[0026] Optionally, the insulating film includes at least one crease surface connecting any two adjacent ones of the first insulating surface, the second insulating surface, the third insulating surface, the fourth insulating surface, the top insulating surface, and the bottom insulating surface. Hemming edges are provided at the joints of any two adjacent ones of the top wall, the bottom wall, the first side wall, the second side wall, the front wall, and the rear wall, and the crease surface corresponds to the hemming edge.

[0027] Optionally, the battery cell assembly includes a plurality of battery cells stacked in a first direction. Arc-shaped side surfaces are provided on the battery cells facing both the third insulating surface and the fourth insulating surface, and the ratio of the width of the crease surface corresponding to the arc-shaped side surface to the radius of the arc-shaped side surface is π / 2 to 5.

[0028] Optionally, at least one of the third insulating surface and the fourth insulating surface is a coincident surface, and the width of the coincident part in the coincident surface is greater than or equal to 0.2 mm;

[0029] The third insulating surface includes a first connection surface and a second connection surface, and the first connection surface and the second connection surface are provided on at least two of the first insulating surface, the second insulating surface, the top insulating surface, and the bottom insulating surface;

[0030] The fourth insulating surface includes a third connection surface and a fourth connection surface, and the third connection surface and the fourth connection surface are provided on at least two of the first insulating surface, the second insulating surface, the top insulating surface, and the bottom insulating surface;

[0031] At least one of the sum of the width of the first connection surface and the width of the second connection surface and the sum of the width of the third connection surface and the width of the fourth connection surface is greater than the distance between the front wall and the rear wall in the battery cell assembly.

[0032] Optionally, the ratio of any one of the width of the first connection surface, the width of the second connection surface, the width of the third connection surface, and the width of the fourth connection surface to the distance between the front wall and the rear wall in the battery cell assembly is 0.2 - 1.1.

[0033] Optionally, the bottom insulating surface is a gap surface, and a bottom support plate is provided between the bottom wall and the bottom insulating surface, and the bottom support plate covers at least part of the gap of the bottom insulating surface;

[0034] The bottom insulating surface includes a fifth connection surface and a sixth connection surface respectively connected to at least two of the first insulating surface, the second insulating surface, the third insulating surface, and the fourth insulating surface; there is a gap between the fifth connection surface and the sixth connection surface.

[0035] Optionally, the thickness of the bottom pallet is 0.1 mm - 2 mm;

[0036] The width of the gap is greater than or equal to 0.1 mm.

[0037] Optionally, the insulating film is provided with a liquid injection hole and a soaking hole communicating with the inside of the battery cell assembly. The soaking hole includes a strip-shaped soaking slit provided on the bottom insulating surface, and / or a rectangular hole, and / or a second through hole provided at the crease of the insulating film.

[0038] Optionally, the diameter of the liquid injection hole is greater than or equal to 2 mm; and / or,

[0039] The width of the rectangular hole is greater than or equal to 0.5 mm, and / or,

[0040] The width of the soaking slit is less than or equal to 0.1 mm, and / or,

[0041] The length of the soaking slit is greater than or equal to 1 mm.

[0042] Optionally, it further includes corner glue, and the corner glue is attached to the outside of any two adjacent and non-connected ones of the first insulating surface, the second insulating surface, the third insulating surface, the fourth insulating surface, the top insulating surface, and the bottom insulating surface.

[0043] Optionally, the length of the corner glue is greater than or equal to 5 mm.

[0044] Optionally, it further includes a housing. The housing has a receiving cavity and an opening. The battery cell assembly wrapped with the insulating film is disposed in the receiving cavity of the housing, and the top cover assembly is fixedly connected to the opening of the housing to form a sealed battery structure.

[0045] An electrical device includes a load and the battery according to any one of the above, and the battery is used to supply power to the load.

[0046] During the assembly of the battery provided in the present application, the ear needs to be connected to the electrode lead-out assembly. The side of the electrode lead-out assembly facing the battery cell assembly contacts the top wall of the battery cell assembly. The insulating film is folded, and the folded insulating film is combined into an approximate rectangular parallelepiped structure. The battery cell assembly with the electrode lead-out assembly is placed into the insulating film from the opening of the insulating film, and the first insulating surface is disposed on the outer surface of the front wall, the second insulating surface is disposed on the outer surface of the rear wall, the third insulating surface is disposed on the outside of the first side wall, the fourth insulating surface is disposed on the outside of the fourth insulating surface, the top insulating surface is disposed between the electrode lead-out assembly and the top cover assembly, and the bottom insulating surface is disposed on the outside of the bottom wall.

[0047] During the actual assembly of the battery provided in this application, the top insulating surface of the insulating film can be used to insulate the electrode lead-out assembly from the top cover assembly, eliminating the need for the lower plastic, which can effectively reduce the overall second-direction dimension of the battery. In the case of batteries of the same size, the battery cell assembly provided in this application can effectively increase the internal space of the battery, improve the battery capacity, and at the same time reduce the hot melt welding process between the insulating film and the lower plastic, thus reducing costs.

[0048] In addition, this application also provides an electrical device including the above battery. Since the space occupied by the battery in the second direction is reduced, it is beneficial to realize the miniaturization and light weight of the electrical device. In the case of electrical devices of the same size, the battery capacity can be effectively improved, and the working duration of the electrical device that can be achieved with a single charge can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without creative efforts.

[0050] Figure 1 Schematic diagram of the external structure of a specific embodiment of the battery provided in this application;

[0051] Figure 2 Explosion diagram of the battery provided in this application;

[0052] Figure 3 Schematic diagram of the structure after the combination of the battery cell assembly and the electrode lead-out assembly;

[0053] Figure 4 For Figure 3 Explosion diagram of the combination of the battery cell assembly and the electrode lead-out assembly in

[0054] Figure 5 Cross-sectional view of the battery;

[0055] Figure 6 For Figure 5 Partial enlarged view of part A in

[0056] Figure 7 Schematic diagram of the structure of a specific embodiment one in which the insulating film is in an unfolded state;

[0057] Figure 8 For Figure 7 Partial enlarged view of part B in

[0058] Figure 9 For Figure 7Schematic diagram of the structure where the middle insulating film is coated on the outside of the battery cell assembly;

[0059] Figure 10 is Figure 9 Schematic diagram of the structure when neither the structure coincidence surface nor the gap surface is in contact;

[0060] Figure 11 is Figure 9 Schematic diagram of the structure when the structure gap surface is not in contact;

[0061] Figure 12 Schematic diagram of the structure of the middle insulating film coated on the outside of the battery cell assembly from another angle;

[0062] Figure 13 Schematic diagram of the structure where the corner glue is pasted on the outside of the insulating film;

[0063] Figure 14 Schematic diagram of the second specific embodiment where the insulating film is in the unfolded state;

[0064] Figure 15 Schematic diagram of the third specific embodiment where the insulating film is in the unfolded state;

[0065] Figure 16 Schematic diagram of the fourth specific embodiment where the insulating film is in the unfolded state;

[0066] Figure 17 Schematic diagram of the fifth specific embodiment where the insulating film is in the unfolded state;

[0067] Figure 18 Schematic diagram of the sixth specific embodiment where the insulating film is in the unfolded state;

[0068] Figure 19 Schematic diagram of the seventh specific embodiment where the insulating film is in the unfolded state;

[0069] Figure 20 Schematic diagram of the eighth specific embodiment where the insulating film is in the unfolded state;

[0070] Figure 21 Schematic diagram of the ninth specific embodiment where the insulating film is in the unfolded state;

[0071] Figure 22 Schematic diagram of the tenth specific embodiment where the insulating film is in the unfolded state;

[0072] Figure 23 Schematic diagram of the eleventh specific embodiment where the insulating film is in the unfolded state;

[0073] Figure 24 Schematic diagram of the twelfth specific embodiment where the insulating film is in the unfolded state;

[0074] Figure 25 Structural schematic diagram of the thirteenth specific embodiment in which the insulating film is in an unfolded state;

[0075] Figure 26 Structural schematic diagram of the fourteenth specific embodiment in which the insulating film is in an unfolded state;

[0076] Figure 27 Structural schematic diagram of the fifteenth specific embodiment in which the insulating film is in an unfolded state;

[0077] Figure 28 Structural schematic diagram of the sixteenth specific embodiment in which the insulating film is in an unfolded state;

[0078] Figure 29 Structural schematic diagram of the seventeenth specific embodiment in which the insulating film is in an unfolded state;

[0079] Figure 30 Structural schematic diagram of the eighteenth specific embodiment in which the insulating film is in an unfolded state;

[0080] Figure 31 Structural schematic diagram of the nineteenth specific embodiment in which the insulating film is in an unfolded state.

[0081] Figures 1 - 31 Where:

[0082] 01 - Battery;

[0083] 1 - Battery cell assembly, 11 - Battery cell, 12 - Top wall, 13 - Bottom wall, 14 - First side wall, 141 - Arc-shaped side surface, 15 - Second side wall, 16 - Front wall, 17 - Rear wall, 18 - Tab;

[0084] 2 - Insulating film, 21 - First insulating surface, 22 - Second insulating surface, 23 - Third insulating surface, 231 - First connecting surface, 232 - Second connecting surface, 24 - Fourth insulating surface, 241 - Third connecting surface, 242 - Fourth connecting surface, 25 - Top insulating surface, 251 - Third through hole, 26 - Bottom insulating surface, 261 - Fifth connecting surface, 262 - Sixth connecting surface, 27 - Crease surface, 28 - Overlapping surface, 29 - Gap surface, 210 - Liquid injection hole, 211 - Infiltration seam, 212 - Rectangular hole, 213 - Second through hole;

[0085] 3 - Electrode lead-out assembly, 31 - Bottom insulating part, 311 - Groove, 32 - Protective sheet, 33 - Connecting piece, 331 - Mounting hole, 34 - Terminal post, 35 - Top insulating part, 351 - First through hole;

[0086] 4 - Top cover assembly, 41 - Top cover sheet, 42 - Terminal post terminal;

[0087] 5 - Bottom support plate;

[0088] 6 - corner glue

[0089] 7 - housing

[0090] 8 - outer insulating layer Specific implementation manners

[0091] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0092] The core of the present application is to provide a battery. By setting the insulating film and the electrode lead - out assembly, the setting of the lower plastic is avoided, effectively reducing the overall second - direction size of the battery.

[0093] Another core of the present application is to provide an electrical device including the above - mentioned battery.

[0094] The first direction mentioned in the present application document is Figure 1 the Y - axis direction shown in Figure 1 and the second direction mentioned in the present application document is

[0095] Embodiment 1

[0096] Please refer to Figures 1 - 5 , the battery 01 includes a battery cell assembly 1, an insulating film 2 wrapped around the outer surface of the battery cell assembly 1, a top cover assembly 4, an outer insulating layer 8, and a housing 7. The battery cell assembly 1 is provided with tabs 18; the battery cell assembly 1 includes a top wall 12, a bottom wall 13, a first side wall 14, a second side wall 15, a front wall 16, and a rear wall 17; the battery 01 further includes an electrode lead - out assembly 3; the insulating film 2 includes a first insulating surface 21, a second insulating surface 22, a third insulating surface 23, a fourth insulating surface 24, a top insulating surface 25, and a bottom insulating surface 26 that can be folded into a hexahedron. The first insulating surface 21 is disposed on the outer surface of the front wall 16, the second insulating surface 22 is disposed on the outer surface of the rear wall 17, the third insulating surface 23 is disposed outside the first side wall 14, the fourth insulating surface 24 is disposed outside the second side wall 15, the top insulating surface 25 is disposed between the electrode lead - out assembly 3 and the top cover assembly 4, and the bottom insulating surface 26 is disposed outside the bottom wall 13.

[0097] It should be noted that the hexahedron folded from the first insulating surface 21, the second insulating surface 22, the third insulating surface 23, the fourth insulating surface 24, the top insulating surface 25 and the bottom insulating surface 26 of the insulating film 2 in this specific embodiment can be a closed hexahedron or an open hexahedron. As an implementation method, it can be a hexahedron with gaps or holes on at least part of its surface, which is determined according to actual conditions.

[0098] In the process of assembling the battery 01 provided in this specific embodiment, the tab 18 needs to be connected to the electrode lead-out assembly 3, and then the tab 18 is folded so that the battery cells 11 in the battery cell assembly 1 are stacked in the first direction. The lower surface of the electrode lead-out assembly 3 contacts the top wall 12 of the battery cell assembly 1, and the insulating film 2 is folded. After folding, the insulating film 2 is combined into a substantially rectangular parallelepiped structure, and the battery cell assembly 1 with the electrode lead-out assembly 3 is placed into the insulating film 2 through the opening of the insulating film 2, and the first insulating surface 21 is located on the outer surface of the front wall 16 and parallel to the plane where the front wall 16 is located, the second insulating surface 22 is located on the outer surface of the rear wall 17 and parallel to the plane where the rear wall 17 is located, the third insulating surface 23 is arranged on the outer side of the first side wall 14, the fourth insulating surface 24 is arranged on the outer side of the fourth insulating surface 24, the top insulating surface 25 is arranged between the electrode lead-out assembly 3 and the top cover assembly 4, and the bottom insulating surface 26 is arranged on the outer side of the bottom wall 13.

[0099] After the battery cell assembly 1 , the insulating film 2 , and the electrode lead assembly 3 are assembled, the top cover assembly 4 needs to be installed to the side of the electrode lead assembly 3 away from the top wall 12 , and then the shell 7 is installed, and an outer insulating layer 8 is provided on the outside of the shell 7 .

[0100] The outer insulating layer 8 mentioned in this specific embodiment mainly functions as insulation. Firstly, it can realize the insulation of the battery itself to avoid short circuit between the negative electrode and the shell 7; secondly, it can realize the insulation of the module or PACK battery component; in addition, the outer insulating layer 8 can also improve the appearance of the outer surface of the battery 01 and cover the defects on the battery shell.

[0101] During the actual assembly process of the battery 01 provided in this specific embodiment, the top insulating surface 25 of the insulating film 2 can be used to insulate the electrode lead-out assembly 3 and the top cover assembly 4, avoiding the use of the lower plastic, which can effectively reduce the overall second direction size of the battery; in the case of batteries 01 of the same size, the battery cell assembly 1 provided in the present application can effectively increase the internal space of the battery 01, improve the battery capacity, and at the same time reduce the hot melt welding process between the insulating film 2 and the lower plastic, thereby reducing costs.

[0102] Example 2

[0103] Please combine Figures 1 - 5, on the basis of the above embodiments, the tab 18 is folded to the electrode lead-out assembly 3 and electrically connected to the electrode lead-out assembly 3. By folding the tab 18 to the electrode lead-out assembly 3, the electrical connection between the tab 18 and the electrode lead-out assembly 3 can be achieved. At the same time, the height space formed by bending the tab 18 when it is folded to the electrode lead-out assembly 3 can be used to accommodate the structure of the electrode lead-out assembly 3 located below the tab 18. Compared with the welding method of butterfly welding the tab 18 in the prior art, the space occupied by the bent part of the tab 18 in the second direction can be effectively reduced; further reducing the overall size of the battery in the second direction.

[0104] It should be noted that an insulating structure is provided on the side of the electrode lead-out assembly 3 facing the battery cell assembly 1, which can achieve insulation between the electrode lead-out assembly 3 and the top wall 12 of the battery cell assembly 1; of course, a conductive setting method with partial contact positions can also be adopted between the electrode lead-out assembly 3 and the top wall 12 of the battery cell assembly 1, which is specifically determined according to the actual situation.

[0105] Embodiment 3

[0106] Combined as Figure 2 、 Figure 4 shown, on the basis of the above embodiments, the top cover assembly 4 includes a top cover sheet 41 and a terminal post 42, and the electrode lead-out assembly 3 includes a bottom insulating member 31, a protection sheet 32, a connecting sheet 33, and a top insulating member 35; the side of the bottom insulating member 31 facing the battery cell assembly 1 is in contact with the top wall 12; the protection sheet 32 is disposed on the side of the bottom insulating member 31 facing away from the top wall 12; the tab 18 is folded to the upper surface of the protection sheet 32; the connecting sheet 33 is provided with a terminal post 34, and the connecting sheet 33 is disposed on the side of the protection sheet 32 where the folded tab 18 is located; the terminal post 34 is electrically connected to the tab 18 through the connecting sheet 33; the top insulating member 35 is disposed on the side of the connecting sheet 33 facing away from the protection sheet 32, and the top insulating member 35 is provided with a first through hole 351 for the terminal post 34 to pass through; the top cover assembly 4 is disposed on the side of the top insulating member 35 facing away from the connecting sheet 33.

[0107] As Figure 2 shown, a groove 311 is provided on the side of the bottom insulating member 31 facing away from the top wall 12, the protection sheet 32 is disposed in the groove 311, the tab 18 is bent to the upper side of the protection sheet 32, and the welding part of the connecting sheet 33 is penetration-welded to the tab 18. As Figure 4 shown, the connecting sheet 33 is provided with a mounting hole 331, the terminal post 34 is welded and connected into the mounting hole 331, and the terminal post 34 is electrically connected to the tab 18 through the connecting sheet 33.

[0108] In this specific embodiment, by providing a groove 311 in the bottom insulating member 31, the size occupied by the electrode lead-out assembly 3 in the second direction can be further reduced, so as to reduce the size occupied by the overall battery 01 in the second direction.

[0109] Specifically, the protective sheet 32 can be made of a metal material, and the bottom insulating member 31 and the top insulating member 35 are both made of insulating materials. The arrangement of the bottom insulating member 31 and the protective sheet 32 can effectively avoid problems such as overvoltage, overheating, and diaphragm shrinkage of the battery cell assembly 1.

[0110] On the other hand, a top insulating member 35 is provided on the uppermost surface of the electrode lead-out assembly 3, and the top insulating surface 25 of the insulating film 2 is disposed between the top insulating member 35 and the top cover assembly 4; or, the top insulating surface 25 is disposed on the side of the top insulating member 35 facing the connecting piece 33. The bottom insulating member 31 insulates the electrode lead-out assembly 3 from the top wall 12 of the battery cell assembly 1, and the top insulating member 35 and the top insulating surface 25 insulate the electrode lead-out assembly 3 from the top cover piece 41 of the top cover assembly 4. Moreover, the first insulating surface 21, the second insulating surface 22, the third insulating surface 23, the fourth insulating surface 24, the top insulating surface 25, the bottom insulating surface 26, and the top insulating member 35 can ensure that each outer side surface of the battery cell assembly 1 is covered with an insulating structure, effectively preventing each outer side surface of the battery cell assembly 1 from contacting the housing 7.

[0111] In this specific embodiment, the distance between the bottom surface of the groove 311 and the surface of the bottom insulating member 31 that contacts the top wall 12 is 0.2 mm - 2 mm; the thickness of the protective sheet 32 is 0.2 mm - 1.5 mm; the thickness of the tab 18 is 0.2 mm - 1.5 mm, where the thickness of the tab 18 refers to the total thickness after pre-welding of multiple tabs 18; the ratio of the thickness of the protective sheet 32 to the thickness of the tab 18 welded to the connecting piece 33 is 0.1 - 10; the thickness of the top insulating member 35 is 0.2 mm - 2 mm; the thickness of the insulating film 2 is 0.02 - 1 mm, where the thickness of the insulating film 2 refers to the thickness of a single-layer insulating film 2 without overlapping parts. Of course, only the sizes are limited here. According to different actual situations, the distance between the bottom surface of the groove 311 and the surface of the bottom insulating member 31 that contacts the top wall 12, the thickness of the protective sheet 32, the thickness of the tab 18, the ratio of the thickness of the protective sheet 32 to the thickness of the tab 18 welded to the connecting piece 33, the thickness of the top insulating member 35, and the thickness of the insulating film 2 can all be set to other values that meet the requirements, which are determined according to the actual situation and will not be elaborated here.

[0112] Embodiment 4

[0113] Combined with Figures 7 - 12As shown, on the basis of the above embodiments, the insulating film 2 may further include a crease surface 27 connecting adjacent ones of the first insulating surface 21, the second insulating surface 22, the third insulating surface 23, the fourth insulating surface 24, the top insulating surface 25, and the bottom insulating surface 26. Any two adjacent ones of the top wall 12, the bottom wall 13, the first side wall 14, the second side wall 15, the front wall 16, and the rear wall 17 are provided with a hem at the joint, and the crease surface 27 corresponds to the hem.

[0114] As Figure 2 , Figure 10 shown, the battery cell assembly 1 includes a plurality of battery cells 11 stacked in a first direction. The same battery cell assembly 1 may be provided with two battery cells 11 as Figure 2 shown. Of course, according to different actual situations, a greater number of battery cells 11 may also be provided, which is specifically determined according to the actual situation. The battery cells 11 are provided with arc-shaped side surfaces 141 facing both the third insulating surface 23 and the fourth insulating surface 24. During the process of attaching the insulating film 2 to the outside of the battery cell assembly 1, a crease surface 27 may be provided to make the insulating film 2 fit more closely to the battery cell assembly 1. At the same time, as Figure 2 shown, a chamfered edge is provided at the joint of adjacent side surfaces of the housing 7. By providing the crease surface 27, the insulating film 2 can smoothly enter the housing 7 during the process of sleeving the housing 7, avoiding interference with the housing 7.

[0115] In this specific embodiment, the ratio of the width of the crease surface 27 to the radius of the corresponding arc-shaped side surface 141 may be set to π / 2 to 5. Specifically, the ratio of the width of the crease surface 27 to the radius of the corresponding arc-shaped side surface 141 may be π / 2, 2, 2.5, 3, π, 4, or 5, or any point value within the range composed of any two of the above values, which will not be elaborated here.

[0116] Embodiment 5

[0117] As Figures 9 to 12As shown, based on the above embodiments, at least one of the third insulating surface 23 and the fourth insulating surface 24 is a coincident surface 28, and the width of the overlapping portion in the coincident surface 28 is greater than or equal to 0.2 mm; the third insulating surface 23 includes a first connecting surface 231 and a second connecting surface 232, and the first connecting surface 231 and the second connecting surface 232 are disposed on at least two of the first insulating surface 21, the second insulating surface 22, the top insulating surface 25, and the bottom insulating surface 26; the fourth insulating surface 24 includes a third connecting surface 241 and a fourth connecting surface 242, and the third connecting surface 241 and the fourth connecting surface 242 are disposed on at least two of the first insulating surface 21, the second insulating surface 22, the top insulating surface 25, and the bottom insulating surface 26; at least one of the sum of the width of the first connecting surface 231 and the width of the second connecting surface 232 and the sum of the width of the third connecting surface 241 and the width of the fourth connecting surface 242 is greater than the distance between the front wall 16 and the rear wall 17 in the battery cell assembly 1.

[0118] The coincident surface 28 is provided with an overlapping portion, which can effectively improve the connection firmness of the insulation, improve the insulation performance, and prevent the first side wall 14 or the second side wall 15 of the battery cell assembly 1 from contacting the housing 7.

[0119] Specifically, the ratio of any one of the width of the first connecting surface 231, the width of the second connecting surface 232, the width of the third connecting surface 241, and the width of the fourth connecting surface 242 to the distance between the front wall 16 and the rear wall 17 in the battery cell assembly 1 can be 0.2 - 1.1.

[0120] The arrangement of the third insulating surface 23 and the fourth insulating surface 24 in the insulating film 2 can be Figure 7 As shown, the third insulating surface 23 includes a first connecting surface 231 connected to the first insulating surface 21 and a second connecting surface 232 connected to the second insulating surface 22, and the fourth insulating surface 24 includes a third connecting surface 241 connected to the first insulating surface 21 and a fourth connecting surface 242 connected to the second insulating surface 22.

[0121] Of course, the third insulating surface 23 can also include at least three connecting surfaces, and the at least three connecting surfaces are respectively disposed on at least three of the first insulating surface 21, the second insulating surface 22, the top insulating surface 25, and the bottom insulating surface 26; or the fourth insulating surface 24 can also include at least three connecting surfaces, and the at least three connecting surfaces are respectively disposed on at least three of the first insulating surface 21, the second insulating surface 22, the top insulating surface 25, and the bottom insulating surface 26.

[0122] Embodiment 6

[0123] As Figures 9 to 12As shown, on the basis of the above embodiments, the bottom insulating surface 26 is a gap surface 29, a bottom support plate 5 is provided between the bottom wall 13 and the bottom insulating surface 26, and the bottom support plate 5 covers at least part of the gap of the bottom insulating surface 26; the bottom insulating surface 26 includes a fifth connection surface 261 and a sixth connection surface 262 that are respectively connected to at least two of the first insulating surface 21, the second insulating surface 22, the third insulating surface 23, and the fourth insulating surface 24; there is a gap between the fifth connection surface 261 and the sixth connection surface 262.

[0124] The thickness of the bottom support plate 5 is 0.1 mm - 2 mm; the width of the gap is greater than or equal to 0.1 mm.

[0125] The setting of the gap surface 29 can avoid the overlapping setting of the insulating film 2, and further reduce the size occupation of the insulating film 2 in the second direction.

[0126] On the other hand, considering avoiding the contact between the bottom wall 13 of the battery cell assembly 1 and the housing 7, a bottom support plate 5 can be provided. The bottom support plate 5 covers the gap formed by the gap surface 29, as Figure 9 shown, the bottom support plate 5 is made of insulating material and is arranged inside the insulating film 2.

[0127] Embodiment 7

[0128] As Figure 7 shown, on the basis of the above embodiments, the insulating film 2 is provided with a liquid injection hole 210 and infiltration holes communicating with the inside of the battery cell assembly 1. The infiltration holes include long strip-shaped infiltration slits 211 provided on the bottom insulating surface 26, and / or rectangular holes 212, and / or second through holes 213 provided at the creases of the insulating film 2; as Figure 8 shown, the setting method of the second through holes 213 at the creases of the insulating film 2 can be as Figure 8 shown.

[0129] As Figure 2 shown, in order to make the liquid injection hole 210 communicate with the inside of the battery cell assembly 1, a fourth through hole needs to be provided in the bottom insulating member 31, a fifth through hole needs to be provided in the top insulating member 35, and at the same time a U-shaped groove is provided in the connecting piece 33. The adjacent protection pieces 32 are arranged at intervals, and pass through the liquid injection hole 210, the fifth through hole, the U-shaped groove, between the adjacent protection pieces 32, the fourth through hole, and the surface of the battery cell assembly 1 in sequence to realize liquid injection.

[0130] If the size of the infiltration holes is set too large, it is easy for the battery cell assembly 1 to contact the barbs of the housing 7. In this specific embodiment, the middle infiltration holes are set as long strip-shaped infiltration slits 211, which can effectively avoid the contact between the battery cell assembly 1 and the barbs of the housing 7.

[0131] Specifically, the diameter of the liquid injection hole 210 can be greater than or equal to 2 mm; and / or, the width of the rectangular hole 212 can be greater than or equal to 0.5 mm, and / or, the width of the infiltration seam 211 can be less than or equal to 0.1 mm, and / or, the length of the infiltration seam 211 can be greater than or equal to 1 mm.

[0132] Example 8

[0133] As Figure 13 shown, on the basis of the above embodiments, the battery 01 further includes an angular position adhesive 6, and the angular position adhesive 6 is attached to the outside of any two adjacent and non-connected ones among the first insulating surface 21, the second insulating surface 22, the third insulating surface 23, the fourth insulating surface 24, the top insulating surface 25, and the bottom insulating surface 26.

[0134] The length of the angular position adhesive 6 is greater than or equal to 5 mm, and the length of the angular position adhesive 6 mentioned here refers to the length of a single angular position adhesive 6.

[0135] In this specific embodiment, the insulating film 2 is in the form of a sheet, and is formed into a cuboid structure that cooperates with the battery cell assembly 1 through folding. In order to enable the insulating film 2 to be fixed and maintain the required shape after folding, the angular position adhesive 6 can be provided to bond and fix the adjacent insulating films 2, effectively preventing the insulating film 2 from spreading; in addition, after the insulating film 2 is folded and formed, there are gaps between adjacent surfaces or at the splicing joints of the same surface, and the setting of the angular position adhesive 6 can effectively wrap the gaps.

[0136] Example 9

[0137] As Figures 14 - 31 shown, the insulating film 2 can be any one of the forms in Figures 14 - 31 , and of course, it can also be other structural forms that meet the requirements. For example, each surface in Figures 14 - 31 can be replaced by the overlapping surface 28 or the gap surface 29, which is also within the protection scope of this application and is determined according to the actual situation specifically.

[0138] Example 10

[0139] As Figure 2 shown, the battery further includes a housing 7. The housing 7 has a receiving cavity and an opening. The bare battery cell assembly 1 wrapped with the insulating film 2 is placed in the receiving cavity of the housing 7 through the opening, and the top cover assembly 4 is fixedly connected to the opening of the housing 7 to form a sealed battery structure.

[0140] In this specific embodiment, the housing 7 is generally made of a metal material. During actual use, direct contact between the bare battery cell assembly 1 and the housing 7 should be avoided.

[0141] Generally, an outer insulating layer 8 needs to be provided on the outside of the housing 7, which can prevent the housing 7 from leaking electricity and improve the aesthetics of the battery at the same time.

[0142] The present application also provides an electrical device including a load and the battery mentioned in any of the above, wherein the battery is used to supply power to the load.

[0143] The electrical device in the present application can be a medical device, an intelligent robot, a solar smart street lamp, an in-vehicle electrical device of an electric vehicle, etc., which is specifically determined according to the actual situation.

[0144] In the first through hole 351, the second through hole 213, the third through hole 251, the fourth through hole, and the fifth through hole, the first insulating surface 21, the second insulating surface 22, the third insulating surface 23, and the fourth insulating surface 24, the first connection surface 231, the second connection surface 232, the third connection surface 241, the fourth connection surface 242, the fifth connection surface 261, and the sixth connection surface 262 mentioned in this application document, the "first", "second", "third", "fourth", "fifth", and "sixth" are only for distinguishing different positions and there is no order of precedence.

[0145] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. Any combination of all the embodiments provided in this application is within the protection scope of this application and will not be elaborated here.

[0146] The battery and the electrical device provided in the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can still be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A battery, comprising a cell assembly (1), an insulating film (2) wrapped around the outer surface of the cell assembly (1), and a top cover assembly (4), wherein the cell assembly (1) is provided with a tab (18); the cell assembly (1) comprises a top wall (12), a bottom wall (13), a first side wall (14), a second side wall (15), a front wall (16), and a rear wall (17); characterized in that: The battery also includes an electrode lead-out assembly (3); The insulating film (2) comprises a first insulating surface (21) that can be folded into a hexahedron, a second insulating surface (22), a third insulating surface (23), a fourth insulating surface (24), a top insulating surface (25) and a bottom insulating surface (26), wherein the first insulating surface (21) is arranged on the outer surface of the front wall (16), the second insulating surface (22) is arranged on the outer surface of the rear wall (17), the third insulating surface (23) is arranged on the outer side of the first side wall (14), the fourth insulating surface (24) is arranged on the outer side of the second side wall (15), the top insulating surface (25) is arranged between the electrode lead-out assembly (3) and the top cover assembly (4), and the bottom insulating surface (26) is arranged on the outer side of the bottom wall (13).

2. The battery according to claim 1, characterized in that The electrode tab (18) is folded over the electrode lead-out assembly (3) and is electrically connected to the electrode lead-out assembly (3).

3. The battery according to claim 1, characterized in that The electrode lead-out assembly (3) comprises: A bottom insulating member (31), the side of which facing the battery cell assembly (1) is in contact with the top wall (12); A protective sheet (32), the protective sheet (32) being arranged on a side of the bottom insulating member (31) away from the top wall (12); the pole lug (18) being folded onto an upper surface of the protective sheet (32); A connecting piece (33) is provided with a pole (34), and the pole (34) is electrically connected to the pole lug (18) through the connecting piece (33); A top insulating member (35) is arranged on a side of the connecting sheet (33) away from the protective sheet (32), and the top insulating member (35) is provided with a first through hole (351) for allowing the pole (34) to pass through; The top cover assembly (4) is arranged on a side of the top insulating member (35) facing away from the connecting piece (33).

4. The battery according to claim 3, characterized in that A groove (311) is provided on a side of the bottom insulating member (31) facing away from the top wall (12), and the protection sheet (32) is arranged in the groove (311).

5. The battery according to claim 4, characterized in that The distance between the bottom surface of the groove (311) and the surface where the bottom insulating member (31) contacts the top wall (12) is 0.2 mm to 2 mm; and / or, The thickness of the protective sheet (32) is 0.2 mm to 1.5 mm; and / or, The thickness of the tab (18) is 0.2 mm to 1.5 mm; and / or, The ratio of the thickness of the protection sheet (32) to the thickness of the tab (18) welded to the connection sheet (33) is 0.1-10; and / or, The thickness of the top insulating member (35) is 0.2 mm to 2 mm; and / or, The thickness of the insulating film (2) is 0.02-1 mm.

6. The battery according to claim 3, characterized in that The top insulating surface (25) is arranged between the top insulating member (35) and the top cover assembly (4); or, the top insulating surface (25) is arranged on a side of the top insulating member (35) facing the connecting piece (33).

7. The battery according to any one of claims 1 to 6, characterized in that: The insulating film (2) comprises at least one folded surface (27) connecting two adjacent ones of the first insulating surface (21), the second insulating surface (22), the third insulating surface (23), the fourth insulating surface (24), the top insulating surface (25), and the bottom insulating surface (26); any two adjacent ones of the top wall (12), the bottom wall (13), the first side wall (14), the second side wall (15), the front wall (16), and the rear wall (17) are provided with folded edges at the connection points, and the folded surface (27) corresponds to the folded edges.

8. The battery according to claim 7, characterized in that The battery cell assembly (1) comprises a plurality of battery cells (11) stacked along a first direction, wherein the battery cells (11) are provided with arc-shaped side surfaces (141) facing the third insulating surface (23) and the fourth insulating surface (24), and the ratio of the width of the fold surface (27) corresponding to the arc-shaped side surface (141) to the radius of the arc-shaped side surface (141) is π / 2-5.

9. The battery according to claim 7, characterized in that At least one of the third insulating surface (23) and the fourth insulating surface (24) is an overlapping surface (28), and the width of the overlapping portion of the overlapping surface (28) is greater than or equal to 0.2 mm; and / or, The third insulating surface (23) comprises a first connecting surface (231) and a second connecting surface (232), wherein the first connecting surface (231) and the second connecting surface (232) are arranged on at least two of the first insulating surface (21), the second insulating surface (22), the top insulating surface (25), and the bottom insulating surface (26); and / or, The fourth insulating surface (24) comprises a third connecting surface (241) and a fourth connecting surface (242), wherein the third connecting surface (241) and the fourth connecting surface (242) are arranged on at least two of the first insulating surface (21), the second insulating surface (22), the top insulating surface (25), and the bottom insulating surface (26); and / or, At least one of the sum of the width of the first connecting surface (231) and the width of the second connecting surface (232) and the sum of the width of the third connecting surface (241) and the width of the fourth connecting surface (242) is greater than the distance between the front wall (16) and the rear wall (17) in the battery cell assembly (1).

10. The battery according to claim 9, characterized in that The ratio of any one of the width of the first connecting surface (231), the width of the second connecting surface (232), the width of the third connecting surface (241), and the width of the fourth connecting surface (242) to the distance between the front wall (16) and the rear wall (17) in the battery cell assembly (1) is 0.2-1.

1.

11. The battery according to claim 7, characterized in that The bottom insulating surface (26) is a gap surface (29), a bottom support plate (5) is provided between the bottom wall (13) and the bottom insulating surface (26), and the bottom support plate (5) at least partially covers the gap of the bottom insulating surface (26); The bottom insulating surface (26) comprises a fifth connecting surface (261) and a sixth connecting surface (262) respectively connected to at least two of the first insulating surface (21), the second insulating surface (22), the third insulating surface (23), and the fourth insulating surface (24); and the gap is provided between the fifth connecting surface (261) and the sixth connecting surface (262).

12. The battery according to claim 11, characterized in that The thickness of the bottom support plate (5) is 0.1 mm-2 mm; The width of the gap is greater than or equal to 0.1 mm.

13. The battery according to any one of claims 1 to 6, characterized in that: The insulating film (2) is provided with a liquid injection hole (210) and a wetting hole which are connected to the battery cell assembly (1); the wetting hole comprises a long strip-shaped wetting seam (211) provided on the bottom insulating surface (26), and / or a rectangular hole (212), and / or a second through hole (213) provided at a fold of the insulating film (2).

14. The battery according to claim 13, characterized in that The diameter of the injection hole (210) is greater than or equal to 2 mm; and / or, The width of the rectangular hole (212) is greater than or equal to 0.5 mm, and / or, The width of the wetting seam (211) is less than or equal to 0.1 mm, and / or, The length of the wetting seam (211) is greater than or equal to 1 mm.

15. The battery according to any one of claims 1 to 6, characterized in that: The invention also includes corner glue (6), wherein the corner glue (6) is adhered to the outer sides of any two adjacent and unconnected ones of the first insulating surface (21), the second insulating surface (22), the third insulating surface (23), the fourth insulating surface (24), the top insulating surface (25), and the bottom insulating surface (26).

16. The battery according to claim 15, characterized in that The length of the corner glue (6) is greater than or equal to 5 mm.

17. The battery according to any one of claims 1 to 6, characterized in that: It also includes a shell (7), the shell (7) having a accommodating cavity and a mouth, the battery cell assembly (1) wrapped with the insulating film (2) is arranged in the accommodating cavity of the shell (7), and the top cover assembly (4) is fixedly connected to the mouth of the shell (7) to form a sealed battery structure.

18. An electrical device, characterized in that: It comprises a load and the battery according to any one of claims 1 to 17, wherein the battery is used to supply power to the load.

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