Battery and electric equipment

Abstract

The utility model discloses a battery. The battery comprises a shell; the naked battery cell comprises a first pole piece; the side surface, close to the top cover, of the naked battery cell comprises a first area without a tab; the insulating supporting piece comprises a lower convex part located between the inner surface of the top cover and the first area, and the height of the lower convex part is H; wherein the first pole piece comprises a composite current collector and a first pole lug, the first pole lug comprises a first sub-pole lug and a second sub-pole lug which are electrically connected to the two conductive layers respectively, and the second sub-pole lug is electrically connected to the first sub-pole lug; and the sum of the thicknesses of all the first sub-tabs is T1 and H, and T1 is more than or equal to 5 and less than or equal to 20. According to the battery provided by the utility model, the supporting height of the insulating supporting piece is limited, so that the spatial position required by electric connection between the first tab and the first electrode adapter plate after the first tab is leveled and folded is met. The invention further discloses the electric equipment.

Description

Technical Field

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

[0002] As the requirements for battery safety performance continue to increase, composite current collectors are often used in positive electrode sheets, which will increase the overall tab height of the winding core. In order to ensure the reliability of the connection between the tab and the first electrode adapter, the tab is electrically connected to the first electrode adapter after flattening and folding. Because the lower plastic needs to have a higher size to meet the accommodation space required for setting up the overall tab structure. Utility Model Content

[0003] In view of this, the present application provides a battery and also provides an electrical device including the battery, which solves the problem of insufficient accommodation space required for the overall tab structure.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] A battery comprising:

[0006] case;

[0007] A top cover, forming a closed space with the shell;

[0008] A bare cell, disposed in the enclosed space, comprises a first pole piece; a side of the bare cell close to the top cover comprises a first area where no pole lug is disposed;

[0009] An insulating support member, comprising a lower convex portion located between the inner surface of the top cover and the first area, and the height of the lower convex portion is H;

[0010] Among them, the first pole piece includes: a composite current collector, including an intermediate support layer and two conductive layers arranged on the surfaces of both sides of the intermediate support layer; a first pole ear, including a first sub-pole ear and a second sub-pole ear, the first sub-pole ear and the second sub-pole ear are respectively electrically connected to the surfaces of the two conductive layers away from the intermediate support layer, and the second sub-pole ear is electrically connected to the first sub-pole ear; the sum of the thicknesses of all the first sub-pole ears is T1, H and T1 satisfy: 5≤H:T1≤20.

[0011] Optionally, in the above battery,

[0012] The electrical connection area between the first electrode tab and the composite current collector is S1, 10 mm 2 ≤S1≤100mm 2 ;

[0013] and / or,

[0014] The first electrode tab is electrically connected to the first electrode adapter, and the electrical connection area between the first electrode tab and the first electrode adapter is S2, 50mm 2 ≤S2≤200mm 2 ;

[0015] and / or,

[0016] The first electrode adapter is electrically connected to the first pole arranged on the top cover, and the electrical connection area between the first electrode adapter and the first pole is S3,50mm 2 ≤S3≤150mm 2 ;

[0017] and / or,

[0018] The number of the first tabs is n1, S4=n1S1, 10≤S4:S2≤20;

[0019] and / or,

[0020] 10≤S4:S3≤25.

[0021] Optionally, in the above battery,

[0022] The current flow capacity from the composite current collector to the first electrode tab is P1;

[0023] The current capacity from the first electrode tab to the first electrode adapter is P2;

[0024] The overcurrent capacity from the first electrode adapter to the first pole is P3;

[0025] The maximum overcurrent capacity of the battery as a whole is P;

[0026] The battery capacity is Q;

[0027] The maximum charge and discharge rate of the battery is C;

[0028] Among them, P1≥P, P2≥P, P3≥P, P=QC.

[0029] Optionally, in the above battery,

[0030] The current carrying capacity per unit area of ​​the composite current collector is K; the first electrode tab and the composite current collector have a first electrical connection region, and the overcurrent safety factor of the first electrical connection region is M1; the width of the first electrical connection region is W1, and the length is L1; the number of the first electrode tabs is n1; P1 = K×M1×W1×L1×n1;

[0031] and / or,

[0032] The first electrode tab and the first electrode adapter have a second electrical connection area, and the overcurrent safety factor of the second electrical connection area is M2; the width of the second electrical connection area is M2, and the length is L2; ​​P2 = K×M2×W2×L3;

[0033] and / or,

[0034] The first electrode adapter and the first pole have a third electrical connection area, the overcurrent safety factor of the third electrical connection area is M3; the radius of the third electrical connection area is r; P3 = K × M3 × πr 2 .

[0035] Optionally, in the above battery,

[0036] 0.1A / mm 2 ≤K≤10A / mm 2 ;

[0037] and / or,

[0038] 0.1≤M1≤1;

[0039] and / or,

[0040] 1mm≤W1≤10mm;

[0041] and / or,

[0042] 10mm≤L1≤50mm;

[0043] and / or,

[0044] 0.1≤M2≤1;

[0045] and / or,

[0046] 1mm≤W2≤10mm;

[0047] and / or,

[0048] 1mm≤L2≤20mm;

[0049] and / or,

[0050] 0.1≤M3≤1;

[0051] and / or,

[0052] 3mm≤r≤20mm;

[0053] and / or,

[0054] 10Ah≤Q≤1000Ah;

[0055] and / or,

[0056] 1≤C≤10.

[0057] Optionally, in the above battery, the bare cell includes a first pole piece, a second pole piece, and a diaphragm; the first pole piece includes a plurality of first pole piece segment layers arranged in a stacked manner; the second pole piece includes a plurality of second pole piece segment layers arranged in a stacked manner; the diaphragm includes a diaphragm segment layer located between the first pole piece segment layer and the second pole piece segment layer; the first pole ear includes a first portion and a second portion, the first portion is electrically connected to the composite current collector,

[0058] The number of layers of the second part is n1;

[0059] The sum of the thicknesses of all the first pole piece segment layers, the second pole piece segment layers, and the diaphragm segment layers is K1;

[0060] The current flow capacity from the composite current collector to the first electrode tab is P1;

[0061] The first electrode tab and the composite current collector have a first electrical connection region, and the product of the area of ​​the first electrical connection region and P1 is K2; wherein,

[0062] H is positively correlated with n1, and the proportionality coefficient is K1;

[0063] P1 is positively correlated with n1, and the proportionality coefficient is K2;

[0064] H is positively correlated with P1, and the proportionality coefficient is K1 / K2.

[0065] Optionally, in the above battery, along the second direction, the bare cell includes a first side and a second side; the second pole piece includes a finishing layer coated on the periphery of the first pole piece; the diaphragm includes an outer layer coated on the periphery of the bare cell; the first pole piece includes a first pole ear, the second part includes a lap part and a transition part connected in sequence, the transition part includes a turning height section, a connecting section and a folding section, and the folding section includes a second electrical connection area connected to the first electrode transition piece;

[0066] The thickness of the bare battery core is T;

[0067] The thickness of the first pole piece segment layer is T2;

[0068] The thickness of the second pole piece segment layer is T3;

[0069] The thickness of the diaphragm segment layer is T4;

[0070] The thickness of the second portion is T5;

[0071] The number of coating layers of the finishing layer is a;

[0072] The number of coating layers of the outer coating is b;

[0073] On the first side, the distance between the outermost overlap portion and the edge of the bare cell is G1;

[0074] On the second side, the distance between the outermost overlap portion and the edge of the bare cell is G2;

[0075] On the second side, the distance between the end of the second electrical connection area away from the second side and the edge of the bare battery core is G3;

[0076] A reserved gap G4 is provided between the folded section and the first electrode conversion sheet;

[0077] The number of layers of the first pole piece segment layer is n2;

[0078] The number of folding times of the transition portion is n3;

[0079] On the first side, the angle between the outermost overlapped portion and the bare battery cell is θ1;

[0080] The angle between the connecting section and the folding section is θ2;

[0081] The height of the turning height section is H1;

[0082] The thickness of the insulating support member is H2;

[0083] The thickness of the first electrode adapter sheet is H3;

[0084] H≥W1sinθ1+(H1+T1)×n3+G4+tan(π-θ2)(T-G3-G1-T1)+H2+H3;

[0085] T=n2T2+(a+n2)T3+(n2+b)T4;

[0086] T1=T5n1.

[0087] Optionally, in the above battery,

[0088] 2mm≤T≤58mm;

[0089] and / or,

[0090] 20μm≤T1≤2520μm;

[0091] and / or,

[0092] 50μm≤T2≤200μm;

[0093] and / or,

[0094] 50μm≤T3≤250μm;

[0095] and / or,

[0096] 1μm≤T4≤20μm;

[0097] and / or,

[0098] 1μm≤T5≤20μm;

[0099] and / or,

[0100] 0≤a≤3;

[0101] and / or,

[0102] 0≤b≤10;

[0103] 0≤G1≤T / 2;

[0104] and / or,

[0105] 0≤G2≤T / 2;

[0106] and / or,

[0107] 0≤G3≤1μm;

[0108] and / or,

[0109] 0≤G4≤5mm;

[0110] and / or,

[0111] 20≤n1≤120;

[0112] and / or,

[0113] 20≤n2≤120;

[0114] and / or,

[0115] n3≥1;

[0116] and / or,

[0117] 90°≤θ1≤180°;

[0118] and / or,

[0119] 90°≤θ2≤180°;

[0120] and / or,

[0121] 0≤H1≤3mm;

[0122] and / or,

[0123] 0.2mm≤H2≤2mm;

[0124] and / or,

[0125] 0.2mm≤H3≤3mm;

[0126] and / or,

[0127] 1mm≤W1≤10mm;

[0128] and / or,

[0129] 1mm≤H≤10mm.

[0130] Optionally, in the above-mentioned battery, along the second direction, the multiple first pole lugs are arranged at intervals to form a first pole lug area; the first pole lug area includes a bundle center position and a bundle edge position; from the bundle edge position to the bundle center position, the length of the first pole lug along the third direction decreases.

[0131] An electrical device comprises the battery described above.

[0132] In the battery and electrical equipment provided in the present application, the support height of the insulating support member is limited to meet the spatial position required for the first electrode tab to be electrically connected to the first electrode adapter sheet after flattening and folding. BRIEF DESCRIPTION OF THE DRAWINGS

[0133] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0134] Figure 1 This is a cross-sectional view of the battery in this application without a shell;

[0135] Figure 2 for Figure 1 AA section view;

[0136] Figure 3 A cross-sectional view of the battery cell in this application;

[0137] Figure 4 This is a schematic diagram of the structure in which the tab is electrically connected to the first electrode adapter in the present application;

[0138] Figure 5 This is a cross-sectional view of a battery housing in the present application.

[0139] Figure 1-Figure 5 middle:

[0140] 1. Shell; 2. Top cover; 3. Bare battery cell; 4. Insulating support; 5. First pole piece; 6. Second pole piece; 7. Diaphragm; 8. First electrode adapter; 9. First pole; 10. Second electrode adapter; 11. Second pole;

[0141] 51. a first electrode tab; 52. a composite current collector;

[0142] 61. Second pole ear;

[0143] 511, first branch pole ear; 512, second branch pole ear; 513, overlapping portion; 514, transition portion;

[0144] 521, middle support layer; 522, first conductive layer; 523, second conductive layer;

[0145] 5141. Turning height section; 5142. Connecting section; 5143. Folding section. DETAILED DESCRIPTION

[0146] The present application provides a battery and also provides an electrical device including the battery.

[0147] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0148] like Figure 1-5 As shown, a battery includes a shell 1, a top cover 2, a bare cell 3, and an insulating support 4. The shell 1 is a three-dimensional structure with a top opening. The top cover 2 is sealed on the top opening of the shell 1 to form a closed space with the shell 1. The bare cell 3 is arranged in the closed space, and the bare cell 3 includes a first pole piece 5. The side of the bare cell 3 close to the top cover 2 includes a first area where no pole ear is set. The insulating support 4 includes a lower protrusion located between the inner surface of the top cover 2 and the first area, and the height of the lower protrusion is H.

[0149] The first pole piece 5 includes a composite current collector 52 and a first pole tab 51. The composite current collector 52 includes an intermediate support layer 521 and two conductive layers arranged on both sides of the intermediate support layer 521, and the two conductive layers are a first conductive layer 522 and a second conductive layer 523. The first pole tab 51 includes a first sub-pole tab 511 and a second sub-pole tab 512; the first sub-pole tab 511 is electrically connected to the surface of the first conductive layer 522 away from the intermediate support layer 521, and the second sub-pole tab 512 is electrically connected to the surface of the second conductive layer 523 away from the intermediate support layer 521. Along the third direction, the first sub-polarity ear 511 is located at one end of the first conductive layer 522, and the second sub-polarity ear 512 is located at one end of the second conductive layer 523. In addition, along the third direction, the length of the first sub-polarity ear 511 is greater than the length of the second sub-polarity ear 512, and the second sub-polarity ear 512 is electrically connected to the first sub-polarity ear 511, thereby realizing the electrical connection of the two conductive layers of the composite current collector 2011, and the electric energy is conducted out of the bare battery cell 3 through the first sub-polarity ear 511. Along the second direction, a plurality of first sub-polarity ears 51 are stacked, and the sum of the thicknesses of all the first sub-polarity ears 511 is T1, and H and T1 satisfy: 5≤H:T1≤20, for example, H:T1 can be any one of 5, 6, 7, 8, 9, 10, 12.5, 15, 17.5, and 20. Preferably, H:T1 is 12.5.

[0150] It should be noted that when the battery is placed in a three-dimensional rectangular coordinate system, the battery includes a first direction parallel to the long side of the top opening of the housing 1 (the first direction is the attached Figure 1 a direction indicated by an arrow in the middle), a second direction parallel to the short side of the top opening of the housing 1 (the second direction is the direction indicated by an arrow in the middle), and a second direction parallel to the short side of the top opening of the housing 1 Figure 2 The direction indicated by the arrow in the figure), a third direction perpendicular to the top opening of the housing 1 (the third direction is the direction indicated by the arrow in the figure). Figure 1 , and attached Figure 2 (direction indicated by the arrow in the figure). Figure 1 is a cross-sectional view perpendicular to the second direction (housing 1 is not provided), Figure 5 is a cross-sectional view perpendicular to the second direction (housing 1 is provided); Figure 2 Yes Figure 1 AA section view.

[0151] Please see attached Figure 3, it should be further explained that the bare cell 3 includes a first pole piece 5, a second pole piece 6, and a diaphragm 7 arranged between the first pole piece 5 and the second pole piece 6. Along the third direction, on the side close to the top cover 2, the first pole piece 5 includes an extended first pole ear 51 (the second sub-pole ear 512 in the first pole ear 51 is shorter in length, which can be electrically connected to the first sub-pole ear 511; the second sub-pole ear 512 extending from the first pole ear 51 is longer in length), and the second pole piece 6 includes an extended second pole ear 61, and the polarities of the first pole ear 51 and the second pole ear 61 are opposite. The first area refers to the area on the side of the bare cell 3 close to the top cover 2 where neither the first pole ear 51 nor the second pole ear 61 is provided.

[0152] Furthermore, the inner surface of the top cover 2 in the present application is a plane, and the inner surface of the top cover 2 is parallel to the top opening of the shell 1; the top cover 2 is provided with a mounting groove recessed from the inner surface of the top cover to the outer surface of the top cover; the insulating support member 4 includes a clamping portion and a lower protrusion, and the clamping portion of the insulating support member 4 is clamped in the mounting groove of the top cover 2 to realize the clamping positioning of the insulating support member 4 on the top cover 2; the lower protrusion of the insulating support member 4 forms a supporting space between the inner surface of the top cover 2 and the first area of ​​the bare battery cell 3.

[0153] The insulating support member 4 can be made of plastic.

[0154] Furthermore, after the composite current collector 52, the first sub-electrode tab 511, and the second sub-electrode tab 512 are stacked and arranged, they are electrically welded together by roll welding, and after roll welding, the step shoulder structure of the first electrode tab 51 is formed by die cutting (the step shoulder will be introduced below); the first sub-electrode tab 511 is welded to the first electrode adapter 8 after being gathered and arranged; then the first sub-electrode tab 511 is folded, so that the first electrode adapter 8 is welded to the first pole 9 provided on the top cover 2. The second pole tab 61 is welded to the second electrode adapter 10 after being gathered and arranged; then the second pole tab 61 is folded, so that the second electrode adapter 10 is welded to the second pole 11 provided on the top cover 2.

[0155] Roll welding of the composite current collector 52, the first sub-electrode tab 511, and the second sub-electrode tab 512 will inevitably increase the height dimension of the first electrode tab 51 structure in the third direction. The present application limits the height dimension H of the lower boss of the insulating support member 4 in the third direction and the thickness and T1 of the first sub-electrode tab 511 within the above range, so that the height of the lower boss of the insulating support member 4 is significantly increased, and the support space provided by it satisfies the heightened first electrode tab 51 structure, as well as the space position required after the first sub-electrode tab 511 and the first electrode adapter 8 are welded and folded.

[0156] In some embodiments of the present application, the electrical connection area between the first electrode tab 51 and the composite current collector 52 is S1, that is, the roll welding area between the first electrode tab 51 and the composite current collector 52 is S1. 10mm 2 ≤S1≤100mm 2 , for example, S1 can be 10mm 2 , 20mm 2 , 30mm 2 , 40mm 2 , 50mm 2 、60mm 2 , 70mm 2 、80mm 2 、90mm 2 , 100mm 2 Preferably, S1 is 31 mm 2 .

[0157] As described above, the roll welding area between the first pole ear 51 and the composite current collector 52 is ensured, thereby ensuring the firm fixing effect of the first pole ear 51 on the composite current collector 52, and at the same time ensuring the flow capacity from the composite current collector 52 to the first pole ear 51; the problem of unreliable welding and poor flow capacity due to too small roll welding area is avoided, and at the same time, the waste of pole ear materials and processing costs caused by too large roll welding area is avoided.

[0158] The overcurrent capacity refers to the maximum current that can be sustained during the discharge or charge process; the overcurrent capacity is an important indicator to measure the current transmission efficiency inside the battery, which directly affects the charge and discharge speed and safety performance of the battery. The overcurrent capacity of the composite current collector 52 to the first pole ear 51 refers to the maximum current that the connection between the two can withstand during the discharge or charge process.

[0159] In some embodiments, the first electrode tab 51 is electrically connected to the first electrode adapter 8, and the electrical connection area between the first electrode tab 51 and the first electrode adapter 8 is S2, that is, the welding area between the first electrode tab 51 and the first electrode adapter 8 is S2. 50mm 2 ≤S2≤200mm 2 , for example, S2 can be 50mm 2 、60mm 2 , 70mm 2 、80mm 2 、90mm 2 , 100mm 2 , 120mm 2 , 150mm 2 、170mm 2 , 200mm 2 Preferably, S2 is 113 mm 2 .

[0160] As described above, the welding area between the first pole ear 51 and the first electrode adapter plate 8 is guaranteed, thereby ensuring the secure fixing effect of the first pole ear 51 and the first electrode adapter plate 8, and at the same time ensuring the current carrying capacity from the first pole ear 51 to the first electrode adapter plate 8; avoiding the problem of unreliable welding and poor current carrying capacity due to too small welding area, and avoiding the waste of materials and processing costs caused by too large roller welding area.

[0161] It should be noted that the current capacity from the first electrode tab 51 to the first electrode adapter plate 8 refers to the maximum current that the connection between the two can withstand during the discharge or charge process.

[0162] In some embodiments, the first electrode adapter 8 is electrically connected to the first pole 9 provided on the top cover 2, and the electrical connection area between the first electrode adapter 8 and the first pole 9 is S3, that is, the welding area between the first electrode adapter 8 and the first pole 9 is S3. 50mm 2 ≤S3≤150mm 2 , for example, S3 can be 50mm 2 、60mm 2 , 70mm 2 、80mm 2 、90mm 2 , 100mm 2 、110mm 2 , 120mm 2 、130mm 2 、140mm 2 , 150mm 2 Preferably, S3 is 99 mm 2 .

[0163] As described above, the welding area between the first electrode adapter 8 and the first pole 9 is guaranteed, thereby ensuring the secure fixing effect of the first electrode adapter 8 and the first pole 9, and at the same time ensuring the current carrying capacity from the first electrode adapter 8 to the first pole 9; avoiding the problem of unreliable welding and poor current carrying capacity due to too small welding area, and at the same time avoiding the waste of materials and processing costs caused by too large roller welding area.

[0164] It should be noted that the overcurrent capacity from the first electrode adapter plate 8 to the first electrode column 9 refers to the maximum current that the connection between the two can withstand during the discharge or charging process.

[0165] In some embodiments, the number of first pole tabs 51 is n1. The roll welding area of ​​one first pole tab 51 and one composite current collector 52 is S1, and the total roll welding area of ​​all first pole tabs 51 and composite current collectors 52 is S4=n1S1. 10≤S4:S2≤20, for example, S4:S2 can be any one of 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20. Preferably, S4:S2 is 16.5.

[0166] Limiting the ratio of the total roll welding area S4 of the first pole tab 51 to the welding area S2 between the first pole tab 51 and the first electrode transition sheet 8 within the above ratio range can ensure that the current flow capacity from the composite current collector 52 to the first pole tab 51 matches the current flow capacity from the first pole tab 51 to the first electrode transition sheet 8, so as to meet the overall design current flow capacity of the battery.

[0167] In some embodiments, 10≤S4:S3≤25, for example, S4:S3 can be any one of 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25. Preferably, S4:S3 is 18.8.

[0168] Limiting the ratio of the total roll welding area S4 of the first pole tab 51 to the welding area S3 of the first electrode adapter 8 and the first pole 9 within the above-mentioned ratio range can ensure that the current flow capacity from the composite current collector 52 to the first pole tab 51 matches the current flow capacity from the first electrode adapter 8 to the first pole 9, so as to meet the overall design current flow capacity of the battery.

[0169] In some embodiments of the present application, the flow capacity from the composite current collector 52 to the first pole tab 51 is P1. The flow capacity from the first pole tab 51 to the first electrode adapter 8 is P2. The flow capacity from the first electrode adapter 8 to the first pole 9 is P3. The maximum flow capacity of the battery as a whole is P. The battery capacity is Q; the maximum charge and discharge rate of the battery is C.

[0170] Among them, P1≥P, P2≥P, P3≥P, P=QC.

[0171] As described above, it is ensured that the current flow capacities from the composite current collector 52 to the first pole ear 51, from the first pole ear 51 to the first electrode adapter 8, and from the first electrode adapter 8 to the first pole 9 are matched, and the current flow capacity of each electrical connection of the battery is greater than the maximum current flow capacity P of the battery as a whole, thereby ensuring the overall performance, safety and service life of the battery.

[0172] In some embodiments of the present application, the current carrying capacity per unit area of ​​the composite current collector 52 is K. The first electrode tab 51 and the composite current collector 52 have a first electrical connection region, and the overcurrent safety factor of the first electrical connection region is M1. The width of the first electrical connection region is W1, and the length is L1; the number of first electrode tabs 51 is n1; P1 = K × M1 × W1 × L1 × n1. S1 = W1 × L1.

[0173] It should be noted that the first electrical connection area, namely the first welding area, namely the roller welding area, is specifically Figure 4 The area indicated by the label a.

[0174] The current carrying capacity per unit area refers to the maximum current that a material can safely conduct per unit area without causing overheating, excessive voltage drop, or material performance degradation. The overcurrent safety factor is used to evaluate the maximum current that a circuit can carry under specific conditions to ensure that the circuit remains stable and safe both in normal operation and in extreme situations.

[0175] Further, 0.1A / mm 2 ≤K≤10A / mm 2 , for example, K can be 0.1A / mm 2 , 0.5A / mm 2 , 1A / mm 2 , 2A / mm 2 、3A / mm 2 , 4A / mm 2 , 5A / mm 2 、6A / mm 2 , 7A / mm 2 , 8A / mm 2 , 9A / mm 2 , 10A / mm 2 Any one of .

[0176] Furthermore, 0.1≤M1≤1, for example, M1 can be any one of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.

[0177] Furthermore, 1mm≤W1≤10mm, for example, W1 can be any one of 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm.

[0178] Furthermore, 10 mm ≤ L1 ≤ 50 mm, for example, L1 can be any one of 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, and 50 mm.

[0179] In some embodiments, the first electrode tab 51 and the first electrode adapter 8 have a second electrical connection area, and the overcurrent safety factor of the second electrical connection area is M2. The width of the second electrical connection area is M2, and the length is L2; ​​P2 = K × M2 × W2 × L3. S2 = M2 × W2.

[0180] It should be noted that the second electrical connection area, that is, the second welding area, is specifically Figure 4 The area indicated by the label b.

[0181] Furthermore, 0.1≤M2≤1, for example, M2 can be any one of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.

[0182] Furthermore, 1mm≤W2≤10mm, for example, W2 can be any one of 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm.

[0183] Furthermore, 1mm≤L2≤20mm, for example, L2 can be any one of 1mm, 3mm, 4mm, 5mm, 7mm, 10mm, 12mm, 15mm, 17mm, and 20mm.

[0184] Furthermore, the first electrode adapter 8 and the first pole 9 have a third electrical connection area, and the overcurrent safety factor of the third electrical connection area is M3; the radius of the third electrical connection area is r; P3 = K × M3 × πr 2 . S3=πr 2 .

[0185] It should be noted that the third electrical connection area, that is, the third welding area, is specifically Figure 4 The area indicated by the label c.

[0186] Furthermore, 0.1≤M3≤1, for example, M3 can be any one of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.

[0187] Furthermore, 3mm≤r≤20mm, for example, r can be any one of 3mm, 5mm, 10mm, 15mm, and 20mm.

[0188] Furthermore, 10Ah≤Q≤1000Ah, for example, Q can be any one of 10Ah, 50Ah, 100Ah, 200Ah, 300Ah, 400Ah, 500Ah, 600Ah, 700Ah, 800Ah, 900Ah, and 1000Ah.

[0189] Furthermore, 1≤C≤10, for example, C can be any one of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10.

[0190] As mentioned above, by controlling the overcurrent safety factor, cross-sectional area, etc. of each welding area, the overcurrent capacity from the composite current collector 52 to the first pole ear 51, from the first pole ear 51 to the first electrode adapter 8, and from the first electrode adapter 8 to the first pole 9 is matched, thereby ensuring the overall performance, safety and service life of the battery.

[0191] In certain embodiments of the present application, the bare cell 3 includes a first pole piece 5, a second pole piece 6, and a diaphragm 7. The first pole piece 5 includes a plurality of first pole piece fragment layers arranged in a stacked manner; the second pole piece 6 includes a plurality of second pole piece fragment layers arranged in a stacked manner; the diaphragm 7 includes a diaphragm fragment layer located between the first pole piece fragment layer and the second pole piece fragment layer. The first pole ear 51 includes a first part and a second part, and the first part is electrically connected to the composite current collector 52. The number of layers of the second part is n1 (that is, the number of layers of the first pole ear 51 is n1, that is, the number of layers of the first sub-pole ear 511 is n1). The sum of the thicknesses of all first pole piece fragment layers, second pole piece fragment layers, and diaphragm fragment layers is K1. The current flow capacity of the composite current collector 52 to the first pole ear 51 is P1. The first pole ear 51 and the composite current collector 52 have a first electrical connection area, and the product of the area of ​​the first electrical connection area and P1 is K2. Among them,

[0192] H is positively correlated with n1, and the proportionality coefficient is K1;

[0193] P1 is positively correlated with n1, and the proportionality coefficient is K2;

[0194] H is positively correlated with P1, and the proportionality coefficient is K1 / K2.

[0195] Please see attached Figure 3 It should be noted that the second portion of the first electrode tab 51 is the area where the first sub-electrode tab 511 and the second sub-electrode tab 512 do not overlap in the cross section perpendicular to the first direction.

[0196] Please see attached Figure 2 , it needs to be further explained that, along the second direction, the bare cell 3 includes a first side and a second side. The second pole piece 6 includes a finishing layer coated on the periphery of the first pole piece 5. The diaphragm 7 includes an outer coating coated on the periphery of the bare cell 3. The first pole piece 5 includes a first pole ear 51, and the second part of the first pole ear 51 includes a lap portion 513 and a transition portion 514 connected in sequence, and the transition portion 514 includes a turning height section 5141, a connecting section 5142 and a folding section 5143, and the folding section 5143 includes a second electrical connection area connected to the first electrode transition piece 8.

[0197] The thickness of the bare battery cell 3 is T;

[0198] The thickness of the first pole piece segment layer is T2;

[0199] The thickness of the second pole piece segment layer is T3;

[0200] The thickness of the diaphragm segment layer is T4;

[0201] The thickness of the second portion is T5 (ie, the thickness of the first sub-electrode tab 511 is T5);

[0202] The number of coating layers in the finishing layer is a;

[0203] The number of coating layers of the outer cladding is b;

[0204] On the first side, the distance between the outermost overlapping portion 513 and the edge of the bare battery cell 3 is G1;

[0205] On the second side, the distance between the outermost overlapping portion 513 and the edge of the bare battery cell 3 is G2;

[0206] On the second side, the distance between the end of the second electrical connection area away from the second side and the edge of the bare battery cell 3 is G3;

[0207] There is a reserved gap G4 between the folded section 5143 and the first electrode adapter sheet 8;

[0208] The number of layers of the first pole piece segment layer is n2;

[0209] The number of folding times of the transition portion 514 is n3;

[0210] On the first side, the angle between the outermost overlap portion 513 and the bare battery cell 3 is θ1;

[0211] The angle between the connecting section 5142 and the folding section 5143 is θ2;

[0212] The height of the turning height section 5141 is H1;

[0213] The thickness of the insulating support member 4 is H2;

[0214] The thickness of the first electrode transfer sheet 8 is H3.

[0215] In order to achieve the maximum current carrying capacity of the battery, at least one of the first pole ear 51 and the second pole ear 61 is designed as a full pole ear or close to a full pole ear; the other pole ear is designed to match the current carrying capacity to achieve G1 and G2 infinitely close to zero; the thickness H2 of the insulating support 4, the thickness H3 of the first electrode adapter 8, the reserved gap G4, the width W1 of the first electrical connection area and the thickness of each material of the winding core are relatively constant in the overall design of the battery; in addition, the angle relationship θ1 and θ2 is formed by the winding core in the height direction due to tolerance compensation after assembly. Therefore, the design height H of the lower boss of the insulating support 4 is positively correlated with the number of layers n1 of the first pole ear 51, which can be simplified as H=K1=K1n1+Z, where Z is the sum of the relative constants in the height direction.

[0216] P1 is positively correlated with n1, and the proportional coefficient is K2, which can be simplified to P1 = K2n1

[0217] H is positively correlated with P1, and the proportional coefficient is K1 / K2, which can be simplified as H=K1 / K2×P1+Z.

[0218] It can be seen from the above formula that the design height H of the lower boss of the insulating support member 4 can be adaptively adjusted according to the value changes of K1, K2, P1, and Z, so that the insulating support member 4 can meet the assembly space requirements of the tab structure of different types of batteries.

[0219] Please see attached Figure 2 , along the second direction, the battery includes two bare cells 3 arranged in parallel, and the two groups of first sub-electrode tabs 511 in the two bare cells 3 are symmetrically welded to the first electrode adapter sheet 8 after being gathered and arranged. In some embodiments,

[0220] H≥W1sinθ1+(H1+T1)×n3+G4+tan(π-θ2)(T-G3-G1-T1)+H2+H3;

[0221] T=n2T2+(a+n2)T3+(n2+b)T4;

[0222] T1=T5n1.

[0223] Further, 2mm≤T≤58mm, for example, T can be any one of 2mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 58mm. Preferably, 13mm≤T≤19mm; more preferably, T is 16mm.

[0224] Further, 20μm≤T1≤2520μm, for example, T1 can be any one of 20μm, 50μm, 100μm, 150μm, 200μm, 300μm, 400μm, 500μm, 600μm, 700μm, 800μm, 1000μm, 1200μm, 1500μm, 2300μm, 2500μm, and 2520μm. Preferably, 400μm≤T1≤800μm; more preferably, T1 is 600μm.

[0225] Further, 50 μm≤T2≤200 μm, for example, T2 can be any one of 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 120 μm, 130 μm, 150 μm, 180 μm, and 200 μm. Preferably, 110 μm≤T2≤130 μm; more preferably, T2 is 120 μm.

[0226] Further, 50μm≤T3≤250μm, for example, T3 can be any one of 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 120μm, 130μm, 145μm, 150μm, 155μm, 160μm, 165μm, 170μm, 180μm, and 200μm. Preferably, 145μm≤T3≤165μm; more preferably, T3 is 155μm.

[0227] Further, 1μm≤T4≤20μm; for example, T4 can be any one of 1μm, 3μm, 5μm, 6μm, 6.6μm, 7μm, 7.6μm, 8μm, 8.6μm, 9μm, 9.6μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 18μm, and 20μm. Preferably, 6μm≤T4≤12μm; more preferably, T4 is 8.6μm.

[0228] Further, 1 μm≤T5≤20 μm, for example, T5 can be any one of 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 12 μm, 15 μm, 18 μm, and 20 μm. Preferably, 8 μm≤T5≤12 μm.

[0229] Furthermore, 0≤a≤3, for example, a can be any one of 0, 0.5, 1, 1.5, 2, 2.5, and 3.

[0230] Further, 0≤b≤10, for example, b can be any one of 0, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 8, 9, and 10. Preferably, 0.5≤b≤3; more preferably, b is 0.5.

[0231] Furthermore, 0≤G1≤T / 2, for example, G1 is any one of 0, T / 20, T / 15, T / 10, T / 5, and T / 2.

[0232] Furthermore, 0≤G2≤T / 2, for example, G2 is any one of 0, T / 20, T / 15, T / 10, T / 5, and T / 2.

[0233] Furthermore, 0≤G3≤1μm, for example, G3 can be any one of 0μm, 0.1μm, 0.2μm, 0.3μm, 0.4μm, 0.5μm, 0.6μm, 0.7μm, 0.8μm, 0.9μm, and 1μm.

[0234] Furthermore, 0≤G4≤5mm, for example, G4 can be any one of 0, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, and 5mm. Preferably, 1≤G4≤2mm.

[0235] Further, 20≤n1≤120, for example, n1 can be any one of 20, 30, 40, 50, 60, 61, 62, 65, 70, 80, 90, 100, 110, and 120. Preferably, 50≤n1≤70; more preferably, n1 is 62.

[0236] Further, 20≤n2≤120, for example, n2 can be any one of 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, and 120. Preferably, 50≤n2≤70.

[0237] n3≥1, for example, n3 can be any one of 1, 2, and 3.

[0238] Furthermore, 90°≤θ1≤180°, for example, θ1 can be any one of 90°, 100°, 120°, 150°, and 180°.

[0239] Furthermore, 90°≤θ2≤180°, for example, θ2 can be any one of 90°, 100°, 120°, 150°, and 180°.

[0240] Further, 0≤H1≤3mm, for example, H1 can be any one of 0, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, and 3mm. Preferably, 0≤H1≤2mm.

[0241] Further, 0.2 mm ≤ H2 ≤ 2 mm, for example, H2 can be any one of 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, and 2 mm. Preferably, 0.5 mm ≤ H2 ≤ 0.8 mm.

[0242] Furthermore, 0.2 mm ≤ H3 ≤ 3 mm, for example, H3 can be any one of 0.2 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, and 3 mm. Preferably, 0.5 ≤ H2 ≤ 1.5 mm.

[0243] Further, 1mm≤W1≤10mm, for example, W1 can be any one of 1mm, 2mm, 3mm, 4mm, 4.5mm, 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm. Preferably, W1 is 4.5mm.

[0244] Furthermore, 1mm≤H≤10mm, for example, H can be any one of 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, and 10mm.

[0245] As described above, after the first pole ear 51 is welded into the shell, the first sub-pole ear 511 and the first electrode adapter sheet 8 can meet the welding reliability requirements, and will not be squeezed or dislocated due to too small a reserved space, or pulled due to too large a reserved space; the roller welding area will not be folded, and the dislocation of the welding area will avoid damaging the welding reliability.

[0246] Please see attached Figure 2 In some embodiments of the present application, along the second direction, a plurality of first pole tabs 51 are arranged at intervals to form a first pole tab region. The first pole tab region includes a bundle center position and a bundle edge position. From the bundle edge position to the bundle center position, the length of the first pole tab 51 along the third direction decreases.

[0247] It should be noted that, along the second direction, the first pole lug region has two edge sides; wherein the beam center position and the beam edge position can be located at the two edge sides of the first pole lug region respectively; in this case, along the second direction, the lengths of the plurality of first pole lugs 51 along the third direction increase or decrease. Alternatively, there are two beam edge positions, which are located at the two edge sides of the first pole lug region respectively, and the beam center position is located between the two beam edge positions; in this case, along the second direction, the lengths of the plurality of first pole lugs 51 along the third direction first decrease and then increase.

[0248] Furthermore, along the second direction, the spacing distance between the beam combining center position and the beam combining edge position is less than 5 mm.

[0249] The specific embodiments are as follows: Figure 2, along the second direction, there are two bare cells 3 arranged in parallel, and the bare cells 3 include a docking side where two bare cells 3 are docked, and a non-docking side opposite to the docking side; the bundling center position of the first pole ear region is close to the non-docking side of the bare cell, and along the second direction, from the docking side to the non-docking side (that is, from the bundling edge position to the bundling center position), the length of the first pole ear 51 along the third direction decreases, that is, the length of the first sub-pole ear 511 along the third direction decreases.

[0250] As described above, when the first sub-electrode ear 511 after being bundled and sorted is welded with the first electrode adapter plate 8, the length misalignment of the first sub-electrode ear 511 from the edge of the bundle to the center of the bundle is reduced, which effectively ensures the reliability of welding with the first electrode adapter plate 8 and ensures the current carrying capacity.

[0251] It should be further explained that the first pole piece 5 is a composite pole piece, and at least one of the positive pole piece and the negative pole piece of the battery is a composite pole piece. For example, the first pole piece 5 is a composite positive pole piece, and the second pole piece 6 is a common negative pole piece. The lengths of the first pole lug 51 and / or the second pole lug 61 in the same layer or the same fold along the third direction are consistent; the lengths of the first pole lug 51 and / or the second pole lug 61 in different layers or different folds along the third direction decrease from the edge of the bundle to the center of the bundle.

[0252] Furthermore, after the first pole tab 51 is roll-welded with the composite current collector 52, a step shoulder is obtained by die-cutting; wherein the first pole tab 51 includes a first portion electrically connected to the composite current collector 52 and a second portion welded to the first electrode adapter 8; the step shoulder is located in the area of ​​the first portion that is not connected to the second portion. The width of the step shoulder with different layers or different folds can increase, decrease or change irregularly; in the cross section perpendicular to the second direction, the projection of the second portion of the first pole tab 51 overlaps, and it does not overlap with the projection of the second pole tab 61.

[0253] The components and devices involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the drawings. As will be appreciated by those skilled in the art, these components and devices can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, meaning "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0254] It should also be noted that in the device of the present application, each component can be decomposed and / or reassembled, and these decompositions and / or reassemblies should be regarded as equivalent solutions of the present application.

[0255] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0256] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

[0257] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, characterized in that: include: case; A top cover, forming a closed space with the shell; A bare cell, disposed in the enclosed space, comprises a first pole piece; a side of the bare cell close to the top cover comprises a first area where no pole lug is disposed; An insulating support member, comprising a lower convex portion located between the inner surface of the top cover and the first area, and the height of the lower convex portion is H; Among them, the first pole piece includes: a composite current collector, including an intermediate support layer and two conductive layers arranged on the surfaces of both sides of the intermediate support layer; a first pole ear, including a first sub-pole ear and a second sub-pole ear, the first sub-pole ear and the second sub-pole ear are respectively electrically connected to the surfaces of the two conductive layers away from the intermediate support layer, and the second sub-pole ear is electrically connected to the first sub-pole ear; the sum of the thicknesses of all the first sub-pole ears is T1, H and T1 satisfy: 5≤H:T1≤20.

2. The battery according to claim 1, characterized in that The electrical connection area between the first electrode tab and the composite current collector is S1, 10 mm 2 ≤S1≤100mm 2 ; and / or, The first electrode tab is electrically connected to the first electrode adapter, and the electrical connection area between the first electrode tab and the first electrode adapter is S2, 50mm 2 ≤S2≤200mm 2 ; and / or, The first electrode adapter is electrically connected to the first pole arranged on the top cover, and the electrical connection area between the first electrode adapter and the first pole is S3,50mm 2 ≤S3≤150mm 2 ; and / or, The number of the first tabs is n1, S4=n1S1, 10≤S4:S2≤20; and / or, 10≤S4:S3≤25.

3. The battery according to claim 1, characterized in that The current flow capacity from the composite current collector to the first electrode tab is P1; The current capacity from the first electrode tab to the first electrode adapter is P2; The overcurrent capacity from the first electrode adapter to the first pole is P3; The maximum overcurrent capacity of the battery as a whole is P; The battery capacity is Q; The maximum charge and discharge rate of the battery is C; Among them, P1≥P, P2≥P, P3≥P, P=QC.

4. The battery according to claim 3, characterized in that The current carrying capacity per unit area of ​​the composite current collector is K; the first electrode tab and the composite current collector have a first electrical connection region, and the overcurrent safety factor of the first electrical connection region is M1; the width of the first electrical connection region is W1, and the length is L1; the number of the first electrode tabs is n1; P1 = K×M1×W1×L1×n1; and / or, The first electrode tab and the first electrode adapter have a second electrical connection area, and the overcurrent safety factor of the second electrical connection area is M2; the width of the second electrical connection area is M2, and the length is L2; ​​P2 = K×M2×W2×L3; and / or, The first electrode adapter and the first pole have a third electrical connection area, the overcurrent safety factor of the third electrical connection area is M3; the radius of the third electrical connection area is r; P3 = K × M3 × πr 2 .

5. The battery according to claim 4, characterized in that 0.1A / mm 2 ≤K≤10A / mm 2 ; and / or, 0.1≤M1≤1； and / or, 1mm≤W1≤10mm; and / or, 10mm≤L1≤50mm; and / or, 0.1≤M2≤1； and / or, 1mm≤W2≤10mm; and / or, 1mm≤L2≤20mm; and / or, 0.1≤M3≤1； and / or, 3mm≤r≤20mm; and / or, 10Ah≤Q≤1000Ah; and / or, 1≤C≤10。 6. The battery according to claim 1, characterized in that The bare cell comprises a first pole piece, a second pole piece, and a diaphragm; the first pole piece comprises a plurality of first pole piece segment layers arranged in a stacked manner; the second pole piece comprises a plurality of second pole piece segment layers arranged in a stacked manner; the diaphragm comprises a diaphragm segment layer located between the first pole piece segment layer and the second pole piece segment layer; the first pole ear comprises a first portion and a second portion, the first portion being electrically connected to the composite current collector, The number of layers of the second part is n1; The sum of the thicknesses of all the first pole piece segment layers, the second pole piece segment layers, and the diaphragm segment layers is K1; The current flow capacity from the composite current collector to the first electrode tab is P1; The first electrode tab and the composite current collector have a first electrical connection region, and the product of the area of ​​the first electrical connection region and P1 is K2; wherein, H is positively correlated with n1, and the proportionality coefficient is K1; P1 is positively correlated with n1, and the proportionality coefficient is K2; H is positively correlated with P1, and the proportionality coefficient is K1 / K2.

7. The battery according to claim 6, characterized in that Along the second direction, the bare cell includes a first side and a second side; the second pole piece includes a finishing layer coated on the periphery of the first pole piece; the diaphragm includes an outer layer coated on the periphery of the bare cell; the first pole piece includes a first pole ear, the second part includes a lap part and a transition part connected in sequence, the transition part includes a turning height section, a connecting section and a folding section, and the folding section includes a second electrical connection area connected to the first electrode transition piece; The thickness of the bare battery core is T; The thickness of the first pole piece segment layer is T2; The thickness of the second pole piece segment layer is T3; The thickness of the diaphragm segment layer is T4; The thickness of the second portion is T5; The number of coating layers of the finishing layer is a; The number of coating layers of the outer coating is b; On the first side, the distance between the outermost overlap portion and the edge of the bare cell is G1; On the second side, the distance between the outermost overlap portion and the edge of the bare cell is G2; On the second side, the distance between the end of the second electrical connection area away from the second side and the edge of the bare battery core is G3; A reserved gap G4 is provided between the folded section and the first electrode conversion sheet; The number of layers of the first pole piece segment layer is n2; The number of folding times of the transition portion is n3; On the first side, the angle between the outermost overlapped portion and the bare battery cell is θ1; The angle between the connecting section and the folding section is θ2; The height of the turning height section is H1; The thickness of the insulating support member is H2; The thickness of the first electrode adapter sheet is H3; H≥W1sinθ1+(H1+T1)×n3+G4+tan(π-θ2)(T-G3-G1-T1)+H2+H3; T=n2T2+(a+n2)T3+(n2+b)T4; T1=T5n1.

8. The battery according to claim 7, characterized in that 2mm≤T≤58mm; and / or, 20μm≤T1≤2520μm; and / or, 50 μm ≤ T2 ≤ 200 μm; and / or, 50 μm ≤ T3 ≤ 250 μm; and / or, 1μm≤T4≤20μm; and / or, 1μm≤T5≤20μm; and / or, 0≤a≤3； and / or, 0≤b≤10； 0≤G1≤T / 2; and / or, 0≤G2≤T / 2; and / or, 0≤G3≤1μm; and / or, 0≤G4≤5mm; and / or, 20≤n1≤120； and / or, 20≤n2≤120； and / or, n3≥1； and / or, 90°≤θ1≤180°; and / or, 90°≤θ2≤180°; and / or, 0≤H1≤3mm; and / or, 0.2mm≤H2≤2mm; and / or, 0.2mm≤H3≤3mm; and / or, 1mm≤W1≤10mm; and / or, 1mm≤H≤10mm.

9. The battery according to claim 1, characterized in that Along the second direction, the plurality of first pole tabs are arranged at intervals to form a first pole tab area; the first pole tab area includes a bundle center position and a bundle edge position; from the bundle edge position to the bundle center position, the length of the first pole tab along the third direction decreases.

10. An electrical device, characterized in that: A battery comprising the battery according to any one of claims 1 to 9.

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