battery

Abstract

This utility model relates to the field of battery technology and discloses a battery, comprising: a casing having a first surface and a second surface; the first surface having a raised surface and a mounting surface; the raised surface protruding from the mounting surface along the length direction of the battery to form a raised portion; the raised surface and the mounting surface being arranged along the width direction of the battery; a protection plate located on the mounting surface; and an electrode assembly located within the casing, the electrode assembly including an electrode body, a first lead-out portion, a first tab, and a second tab; the electrode body having an extension portion disposed on the raised portion; the first tab being connected to the side of the electrode body facing the first surface; the second tab being connected to the side of the electrode body facing the second surface; the first lead-out portion being connected to the first tab; the first lead-out portion extending out of the casing from the mounting surface; and both the first lead-out portion and the second tab being electrically connected to the protection plate. The battery of this utility model embodiment significantly improves energy density without changing the required installation space.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery. Background Technology

[0002] Batteries in related technologies usually need to be used with protection boards to achieve circuit protection, such as stacked batteries. However, there may be differences in the width of the battery and the protection board. After they are assembled, there will be idle space around the protection board, which will affect the energy density of the battery.

[0003] In some technical solutions, the battery is designed with a protrusion, on which terminals or tabs are mounted to achieve electrical connection with the protection board. This requires the protection board to cover the protrusion, resulting in a larger overall length of the protection board and the battery, which also affects the battery volume. The space around the protection board is not fully utilized, and there is still room for improvement in the battery's energy density. Utility Model Content

[0004] This invention provides a battery that solves the problem in the prior art where idle space is formed around the protection board, affecting the battery's energy density.

[0005] This utility model provides a battery, comprising: a housing having a first surface and a second surface, the first surface having a raised surface and a mounting surface, the raised surface protruding from the mounting surface along the length direction of the battery to form a raised portion, the raised surface and the mounting surface being disposed along the width direction of the battery; a protection plate located on the mounting surface; and an electrode assembly located within the housing, the electrode assembly including an electrode body, a first lead-out portion, a first tab, and a second tab, the electrode body having an extension portion disposed on the raised portion, the first tab being connected to the side of the electrode body facing the first surface, the second tab being connected to the side of the electrode body facing the second surface, the first lead-out portion being connected to the first tab, the first lead-out portion extending out of the housing from the mounting surface, and both the first lead-out portion and the second tab being electrically connected to the protection plate.

[0006] In one alternative embodiment, the protrusion and the protective plate are spaced apart along the width direction of the battery.

[0007] In one optional embodiment, the height H of the protrusion satisfies 0.5mm ≤ H ≤ 8mm.

[0008] In one alternative embodiment, the mounting surface has a dimension W in the width direction of the battery that satisfies 10mm ≤ W ≤ 70mm.

[0009] In one alternative implementation, the first surface and the second surface are arranged adjacent to each other.

[0010] In one optional embodiment, the electrode body includes a first electrode, a second electrode, and a diaphragm, wherein the first electrode, the second electrode, and the diaphragm are stacked, the diaphragm is disposed between the first electrode and the second electrode, the first electrode is connected to a first tab, and the second electrode is connected to a second tab; the electrode body has at least one first groove and at least one second groove, the first tab is disposed in the first groove, and the second tab is disposed in the second groove; and / or, the width A of the heat-affected zone of the diaphragm satisfies A≤0.3mm.

[0011] In one optional embodiment, the first groove includes a first sub-groove and a second sub-groove, the first sub-groove being disposed on the first electrode plate, the second sub-groove being disposed on the second electrode plate, and the second groove including a third sub-groove and a fourth sub-groove, the third sub-groove being disposed on the first electrode plate, and the fourth sub-groove being disposed on the second electrode plate; the distance B1 between the sidewall of the first sub-groove in the width direction of the first electrode tab and the first electrode tab satisfies 1.5mm ≤ B1 ≤ 8.5mm; and / or, the depth C1 of the first sub-groove satisfies 0mm < C1 ≤ 10mm; and / or, the width B2 of the second sub-groove satisfies 6mm ≤ B2 ≤ 20mm. ; and / or, the depth C2 of the second sub-groove satisfies 0mm < C2 ≤ 10mm; and / or, the width B3 of the third sub-groove satisfies 5mm ≤ B3 ≤ 20mm; and / or, the depth C3 of the third sub-groove satisfies 0mm < C3 ≤ 10mm; and / or, the distance B4 between the sidewall of the fourth sub-groove in the width direction of the second electrode tab and the second electrode tab satisfies 1mm ≤ B4 ≤ 8mm; and / or, the depth C4 of the fourth sub-groove satisfies 0mm < C4 ≤ 10mm; and / or, the distance between the bottom wall of the second sub-groove and the shell is D1, and the distance between the bottom wall of the fourth sub-groove and the shell is D2, where D1 ≤ D2.

[0012] In one alternative embodiment, the separator has a third groove, the first tab is located within the third groove, and the orthographic projection of the third groove is located within the orthographic projection of the first groove on a projection plane perpendicular to the thickness direction of the battery; and / or, the separator has an opening located on at least one side of the width direction of the second tab, and the orthographic projection of the opening and the orthographic projection of the second groove at least partially overlap on a projection plane perpendicular to the thickness direction of the battery.

[0013] In one optional embodiment, in the depth direction of the opening, the distance K between the bottom wall of the opening and the second electrode plate satisfies K≥0.1mm; and / or, in the width direction of the second electrode tab, the distance M between the side of the opening facing away from the second electrode tab and the second electrode plate satisfies M≥0.1mm; and / or, the width L of the opening satisfies L≥0.1mm; and / or, the width N of the third groove satisfies 4mm≤N≤20mm; and / or, the depth P of the third groove satisfies 0mm<P≤10mm.

[0014] In one optional embodiment, one of the first electrode and the second electrode is a positive electrode and the other is a negative electrode. The negative electrode has a negative current collector and a negative active layer. The negative active layer comprises a silicon-based material, and the mass percentage of silicon in the negative active layer is 10% to 70%. And / or, the width of the first electrode tab is W1, and the minimum dimension of the opposite sides of the housing in the width direction of the first electrode is W3, where W1 / W3 ≥ 10%. And / or, the width of the second electrode tab is W2, and the minimum dimension of the opposite sides of the housing in the width direction of the second electrode is W4, where W2 / W4 ≥ 10%.

[0015] In one alternative embodiment, the housing is electrically connected to the second tab; or, the electrode assembly further includes a second lead-out, which is connected to the second tab and extends out of the housing from the mounting surface.

[0016] In one optional embodiment, the first electrode has a first clearance groove on the side facing the first surface, the second electrode has a second clearance groove on the side facing the first surface, the diaphragm has a third clearance groove on the side facing the first surface, and the second lead-out portion is located in the third clearance groove; on a projection plane perpendicular to the thickness direction of the battery, the orthographic projection of the second clearance groove is located in the first clearance groove, and the orthographic projection of the third clearance groove is located in the second clearance groove.

[0017] In one optional embodiment, the depth E1 of the first clearance groove satisfies 0.1mm≤E1≤1mm; and / or, the depth E2 of the second clearance groove satisfies 0.1mm≤E2≤1mm; and / or, the depth E1 of the third clearance groove satisfies 0.5mm≤E3≤2mm; and / or, the bending radius Z of the second lead-out portion satisfies 0.5mm≤Z≤8mm.

[0018] In this embodiment of the battery, a protrusion is provided, and the protrusion and the protective plate are located on the same side of the casing. The protrusion and the protective plate are arranged along the width direction of the battery, and the lower edge of the protective plate is lower than the protrusion. The protrusion fills the space near the protective plate, improving the space utilization of the battery compartment. The extension portion is located on the protrusion, which can improve the battery energy density. Furthermore, since the first lead extends out of the casing from the mounting surface, i.e., the first lead is not located on the protrusion, the protective plate does not need to be located on the protrusion, thus not increasing the battery's length. Under the premise that the overall battery volume remains unchanged, the volume of the electrode body is effectively increased, thereby significantly improving the battery energy density. In addition, since the first tab is not located on the extension portion, and the connection between the first tab and the electrode body is lower than the extension portion, when providing the extension portion, a shape adapted to the first tab needs to be machined on the side of the electrode body facing the first surface. When trimming the electrode body, by setting the first and second tabs on different sides of the electrode body, the second tab will not affect the trimming trajectory of the electrode body when reserving space for the first tab during the trimming of the electrode body. This simplifies the trimming operation process, improves the trimming accuracy, ensures the accuracy of subsequent stacking processes, improves production efficiency and product yield, and reduces production costs. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is one of the structural schematic diagrams of a hard-shell battery according to an embodiment of the present invention.

[0021] Figure 2 This is the second structural schematic diagram of a hard-shell battery according to an embodiment of the present invention.

[0022] Figure 3 This is one of the structural schematic diagrams of the electrode assembly in an embodiment of this utility model.

[0023] Figure 4 This is a second schematic diagram of the electrode assembly according to an embodiment of the present invention.

[0024] Figure 5 This is one of the schematic diagrams showing the connection between the first lead and the first tab when the battery is a hard-shell battery according to an embodiment of the present invention.

[0025] Figure 6 middle Figure 5 A magnified view of a portion of region A in the middle.

[0026] Figure 7 This is the second schematic diagram showing the connection between the first lead and the first tab when the battery is a hard-shell battery according to an embodiment of the present invention.

[0027] Figure 8 for Figure 7 A magnified view of a portion of region B in the middle.

[0028] Figure 9 This is one of the schematic diagrams showing the connection between the casing and the second tab when the battery is a hard-cased battery according to an embodiment of the present invention; Figure 10 middle Figure 9 A magnified view of a portion of region C.

[0029] Figure 11 This is a second schematic diagram showing the connection between the casing and the second tab when the battery in this embodiment of the present invention is a hard-cased battery. Figure 12 middle Figure 11 A magnified view of a portion of region D.

[0030] Figure 13 One of the structural schematic diagrams of the battery in this utility model embodiment is a soft-pack battery.

[0031] Figure 14 for Figure 13 A magnified view of a portion of region E in the middle.

[0032] Figure 15 The second schematic diagram of the structure of the battery in this utility model embodiment is a soft-pack battery.

[0033] Figure 16 for Figure 15 A magnified view of a portion of region F in the middle.

[0034] Figure 17 The third schematic diagram of the structure of the battery in this utility model embodiment is a soft-pack battery.

[0035] Figure 18 This is one of the structural schematic diagrams of the first electrode sheet in an embodiment of this utility model.

[0036] Figure 19 This is the second schematic diagram of the structure of the first electrode sheet in the embodiment of this utility model.

[0037] Figure 20 This is one of the structural schematic diagrams of the second electrode sheet in an embodiment of this utility model.

[0038] Figure 21 This is the second schematic diagram of the structure of the second electrode in an embodiment of this utility model.

[0039] Explanation of reference numerals in the attached figures: 1. Battery; 100. Housing; 110. First surface; 111. Protrusion; 112. Mounting surface; 120. Second surface; 200. Electrode assembly; 201. Extension section; 210. Electrode body; 211. First electrode; 212. Second electrode; 213. Diaphragm; 214. Heat-affected zone; 215. Opening; 216. Third groove; 217. First clearance groove; 218. Second clearance groove; 219. Third clearance groove; 220. First lead-out section; 221. First colloid; 230. First tab; 240. Second tab; 250. First groove; 251. First... Sub-groove; 252, Second sub-groove; 260, Second groove; 261, Third sub-groove; 262, Fourth sub-groove; 271, First solder mark; 272, Second solder mark; 273, Third solder mark; 274, Fourth solder mark; 281, First adapter piece; 282, Second adapter piece; 290, Second lead-out part; 291, First solder mark protective adhesive; 292, Second solder mark protective adhesive; 293, Adapter piece; 294, Rigid electrode tab; 295, Second adhesive; 300. Protection board. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] The terms "first," "second," etc., are used for descriptive purposes only and have no sequential or technical meaning, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Directional terms used in this application, such as "upper," "lower," "width direction," "length direction," "thickness direction," "inner," and "outer," are merely for reference to the orientation shown in the accompanying drawings. The use of directional terms is for better and clearer explanation and understanding of this application, and not to indicate the orientation of the referred device or component in an actual application scenario.

[0042] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0043] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0044] The terms "parallel" and "perpendicular" are relative to the current technological level, not absolute mathematical definitions. Slight deviations are permissible; approximations of parallelism or perpendicularity are acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, with the angle between them ranging from 0 to 5 degrees. Similarly, "A and B are perpendicular" means that A and B are perpendicular or approximately perpendicular, with the angle between them ranging from 85 to 95 degrees.

[0045] The term "electrical connection" refers to the flow of current or signal from one conductor to another. An electrical connection between A and B means that current or signal can flow from A to B and vice versa. This connection includes direct and indirect electrical connections. A direct electrical connection between A and B means that A and B are physically connected. An indirect electrical connection between A and B means that A and B are connected via C, where C can be at least one wire or device.

[0046] The following is combined Figures 1 to 21 The following describes embodiments of the present invention.

[0047] According to an embodiment of the present invention, a battery 1 is provided, which includes a housing 100, a protection plate 300, and an electrode assembly 200.

[0048] The housing 100 has a first surface 110 and a second surface 120. The first surface 110 has a raised surface and a mounting surface 112. The raised surface protrudes from the mounting surface 112 along the length direction of the battery 1 to form a protrusion 111. The raised surface and the mounting surface 112 are arranged along the width direction of the battery 1. The protection plate 300 is located within the mounting surface 112, and the electrode assembly 200 is located within the housing 100. The electrode assembly 200 includes an electrode body 210, a first lead-out portion 220, a first tab 230, and a second tab 240. The electrode body 210 has an extension portion 201 located on the protrusion 111. The first tab 230 is connected to the side of the electrode body 210 facing the first surface 110, and the second tab 240 is connected to the side of the electrode body 210 facing the second surface 120. The first lead-out portion 220 is connected to the first tab 230 and extends out of the housing 100 from the mounting surface 112. Both the first lead-out portion 220 and the second tab 240 are electrically connected to the protection plate 300. In a specific example, the second tab 240 is connected to the second surface 120 of the housing 100, and the terminals of the protection plate 300 are connected to the second surface 120 of the housing 100, thereby achieving an electrical connection between the second tab 240 and the protection plate 300. In another specific example, the electrode assembly 200 may also include a second lead-out (not shown) passing through the second surface 120, a second tab 240 connected to the second lead-out, and the second lead-out connected to a protective plate.

[0049] In this embodiment of the utility model, by providing a protrusion 111, and the protrusion 111 and the protective plate 300 are located on the same side of the housing 100, the protrusion 111 and the protective plate 300 are arranged along the width direction of the battery 1, and the lower edge of the protective plate 300 is lower than the protrusion 111. The protrusion 111 fills the space near the protective plate 300, thereby improving the space utilization of the battery compartment. By providing the extension 201 of the electrode body 210 on the protrusion 111, the energy density of the battery 1 can be improved, which can meet the needs of terminal products for miniaturized and long-lasting batteries 1.

[0050] Furthermore, since the first lead-out portion 220 extends out of the housing 100 from the mounting surface 112, i.e., the first lead-out portion 220 is not located on the protrusion 111, the protection plate 300 does not need to be located on the protrusion 111, and will not increase the size of the battery 1 in its length direction. Under the premise that the overall volume of the battery 1 remains unchanged, the volume of the electrode body 210 is effectively increased, thereby significantly improving the energy density of the battery 1 and meeting the usage requirements of high-endurance electronic devices.

[0051] In addition, since the first lead-out portion 220 extends out of the housing 100 from the mounting surface 112, and the first electrode tab 230 is not provided on the extension portion 201, and the connection between the first electrode tab 230 and the electrode body 210 is lower than the extension portion 201, it is necessary to provide the extension portion 201 on the electrode body 210, and at the same time, it is necessary to process the side of the electrode body 210 facing the first surface 110 into a shape that matches the first electrode tab 230.

[0052] When the electrode body 210 is trimmed, if the first tab 230 and the second tab 240 are located on the same side of the electrode body 210, the second tab 240 will block the trimming trajectory of the electrode body 210, resulting in a decrease in trimming accuracy, such as burrs, dimensional deviations, and damage to the tab structure. At the same time, the trimming path needs to be adjusted repeatedly, which increases the complexity of the production process, reduces manufacturing efficiency, and is not conducive to large-scale mass production.

[0053] By setting the first tab 230 and the second tab 240 on different sides of the electrode body 210, when reserving space for the first tab 230 during the trimming of the electrode body 210, the second tab 240 will not affect the trimming trajectory of the electrode body 210. This simplifies the trimming operation process, improves the trimming accuracy, ensures the accuracy of subsequent stacking processes, improves production efficiency and product yield, and reduces production costs.

[0054] Specifically, the electrode body 210 typically includes a first electrode 211, a second electrode 212, and a diaphragm 213, which are stacked together. The electrode body 210 can be a stacked core, with one of the first electrode 211 and the second electrode 212 being a positive electrode and the other a negative electrode. The diaphragm 213 is located between the first electrode 211 and the second electrode 212. The first electrode 211 and the second electrode 212 can be directly machined into shapes with extensions. The first electrode 211 is connected to the first tab 230, and the second electrode 212 is connected to the second tab 240. Since the connection between the first tab 230 and the first electrode 211 is lower than the extension portion, in order to ensure the bending of the first tab 230 and the connection between the first tab 230 and the first lead-out portion 220, the diaphragm 213 needs to be trimmed. The diaphragm 213 is relatively soft and prone to wrinkles, and its processing efficiency is low when processed alone. Therefore, the second electrode 212 and the diaphragm 213 need to be combined first, and then the side of the diaphragm 213 facing the first surface 110 needs to be trimmed to leave a space for the first tab 230 on the side of the diaphragm 213 facing the first surface 110 to match the cell size. Finally, the first electrode 211 and the diaphragm 213 are combined to form the electrode body 210. The side where the second tab 240 is located is the slit edge of the diaphragm 213, so the side where the second tab 240 is located does not need to be trimmed by the diaphragm 213.

[0055] When the diaphragm 213 is trimmed, if the first tab 230 and the second tab 240 are located on the same side of the electrode body 210, the second tab 240 will block the trimming trajectory of the diaphragm 213, resulting in a decrease in trimming accuracy. For example, problems such as burrs, dimensional deviations, and damage to the tab structure may occur. At the same time, the trimming path needs to be adjusted repeatedly, which increases the complexity of the production process, reduces manufacturing efficiency, and is not conducive to large-scale mass production.

[0056] By setting the first tab 230 and the second tab 240 on different sides of the electrode body 210, when reserving space for the first tab 230 during the trimming of the diaphragm 213, the second tab 240 will not affect the trimming trajectory of the diaphragm 213. This simplifies the trimming operation process, improves the trimming accuracy, ensures the accuracy of subsequent stacking processes, improves production efficiency and product yield, and reduces production costs.

[0057] In some embodiments, such as Figure 1 As shown, the protrusion 111 and the protection plate 300 are spaced apart along the width direction of the battery 1. This avoids layout interference between the protrusion 111 and the protection plate 300, facilitates reducing the distance between the protection plate 300 and the housing 100 in the length direction of the battery 1, and makes the overall layout of the battery 1 in its length direction more compact, which is beneficial for making full use of the space of the battery 1 and improving the energy density of the battery 1.

[0058] In some embodiments, such as Figure 1 As shown, the height H of the protrusion 111 satisfies 0.5mm ≤ H ≤ 8mm. H can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, or 8mm. The thickness of the protection plate 300 is typically 0.5mm, and the width is typically 8mm. By setting H between 0.5mm and 8mm, the dimensions of the protrusion 111 and the protection plate 300 in the length direction of the battery 1 are kept relatively close. This maximizes the energy density of the battery 1 while preventing the protrusion 111 from exceeding the protection plate 300, which would increase the length of the battery 1 and thus the required installation space.

[0059] In some embodiments, such as Figure 1 As shown, the dimension W of the mounting surface 112 in the width direction of the housing 100 satisfies 10mm ≤ W ≤ 70mm. Here, W can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, or 80mm. This ensures that while the protrusion 111 increases the energy density of the battery 1, sufficient mounting surface 112 is provided for accommodating the protection plate 300.

[0060] In some embodiments, such as Figure 2 As shown, the electrode body 210 includes a first electrode 211, a second electrode 212, and a diaphragm 213. The first electrode 211, the second electrode 212, and the diaphragm 213 are stacked, with the diaphragm 213 disposed between the first electrode 211 and the second electrode 212. The first electrode 211 is connected to a first tab 230, and the second electrode 212 is connected to a second tab 240. The electrode body 210 has at least one first groove 250 and at least one second groove 260. The first tab 230 is disposed in the first groove 250, and the second tab 240 is disposed in the second groove 260.

[0061] By setting the first groove 250, interference between the first tab 230 and the electrode body 210 can be avoided when the first tab 230 is bent, making it easier to bend the first tab 230. Furthermore, the first groove 250 accommodates the first tab 230, reducing the size of the first tab 230 protruding from the electrode body 210, which helps to reduce the distance between the housing 100 and the electrode body 210 and increase the energy density of the battery 1.

[0062] By providing the second groove 260, interference between the second tab 240 and the electrode body 210 can be avoided when the second tab 240 is bent, making it easier to bend the second tab 240. Furthermore, the second groove 260 accommodates the second tab 240, reducing the size of the second tab 240 protruding from the electrode body 210, which helps to reduce the distance between the housing 100 and the electrode body 210 and increase the energy density of the battery 1.

[0063] The first groove 250 can be located at the connection between the first surface 110 and the second surface 120, that is, at the top corner of the electrode body 210. In this case, the first groove 250 can penetrate the electrode body 210 on the side facing the second surface 120. The second groove 260 can be located at the connection between the first surface 110 and the second surface 120, that is, at the top corner of the electrode body 210. In this case, the second groove 260 can penetrate the electrode body 210 on the side facing the first surface 110, which can further increase the energy density of the battery 1.

[0064] Specifically, the edge trimming process for the separator 213 typically involves heat treatment, laser cutting, or hot cutting. All of these processes generate heat, resulting in a heat-affected zone 214 at the edge of the separator 213 facing the first surface 110 after trimming. The width A of the heat-affected zone 214 ≤ 0.3 mm. A can be 0.1 mm, 0.2 mm, or 0.3 mm. The crystallinity of the separator 213 in the heat-affected zone 214 is greater than that in the non-heat-affected zone 214. By setting a smaller width for the heat-affected zone 214, the ion conduction efficiency of the separator 213 can be improved, the lithium plating probability reduced, the number of thermally closed pores in the separator 213 decreased, and the capacity increased. After processing, the spacing between the separator 213 facing the first surface 110 and the second electrode 212 facing the first surface 110 can be the same.

[0065] In some embodiments, such as Figure 3 , Figure 4 , Figures 18-21 As shown, the first groove 250 includes a first sub-groove 251 and a second sub-groove 252. The first sub-groove 251 is disposed on the first electrode 211, and the second sub-groove 252 is disposed on the second electrode 212. The second groove 260 includes a third sub-groove 261 and a fourth sub-groove 262. The third sub-groove 261 is disposed on the first electrode 211, and the fourth sub-groove 262 is disposed on the second electrode 212.

[0066] The distance B1 between the sidewall of the first sub-groove 251 and the first electrode ear 230 in the width direction satisfies 1.5mm ≤ B1 ≤ 8.5mm, and the depth C1 of the first sub-groove 251 satisfies 0mm < C1 ≤ 10mm. Wherein, B1 can be 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, or 8mm, and C1 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0067] The width B2 of the second sub-groove 252 satisfies 6mm ≤ B2 ≤ 20mm, and the depth C2 of the second sub-groove 252 satisfies 0mm < C2 ≤ 10mm. Wherein, B2 can be 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm, and C2 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0068] The width B3 of the third sub-groove 261 satisfies 5mm ≤ B3 ≤ 20mm, and the depth C3 of the third sub-groove 261 satisfies 0mm < C3 ≤ 10mm. Wherein, B3 can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm, and C3 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0069] The distance B4 between the sidewall of the fourth sub-groove 262 and the second pole ear 240 in the width direction satisfies 1mm ≤ B4 ≤ 8mm, and the depth C4 of the fourth sub-groove 262 satisfies 0mm < C4 ≤ 10mm. Wherein, B4 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, or 8mm, and C4 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0070] In this design, the first electrode 211 can be a positive electrode, and the second electrode 212 can be a negative electrode. This ensures that the depth and width of the first sub-groove 251, the second sub-groove 252, the third sub-groove 261, and the fourth sub-groove 262 are sufficient, allowing the separator 213 to cover both the first and second electrodes 211 and 212, and ensuring that the first groove 250 can accommodate the first tab 230 and the second groove 260 can accommodate the second tab 240. Furthermore, the depth and width of the first sub-groove 251, the second sub-groove 252, the third sub-groove 261, and the fourth sub-groove 262 are not excessively large, ensuring energy density while also ensuring that the area of ​​the second electrode 212 is larger than the area of ​​the first electrode 211, reducing the probability of lithium plating.

[0071] Specifically, such as Figure 2 As shown, the distance between the bottom wall of the second sub-groove 252 and the housing 100 is D1, and the distance between the bottom wall of the fourth sub-groove 262 and the housing 100 is D2, where D1 ≥ D2. D1 refers to the space that at least accommodates the positive electrode tab and the first lead-out portion 220, and D2 refers to the space that at least accommodates the negative electrode tab. Since the first lead-out portion 220 is provided to connect the first electrode plate 211, by setting D1 to be greater than or equal to D2, that is, there can be a certain gap between the bottom wall of the first groove 250 and the housing 100 to accommodate the first lead-out portion 220 and the positive electrode tab, while also ensuring that the negative electrode tab has sufficient space.

[0072] In some embodiments, such as Figure 2As shown, the diaphragm 213 has a third groove 216, and the first tab 230 is located within the third groove 216. On a projection plane parallel to the electrode body 210, the orthographic projection of the third groove 216 lies within the orthographic projection of the first groove 250. Through the third groove 216, the first tab 230 can be located within the third groove 216, which facilitates the bending of the first tab 230 and accommodates the first lead-out portion 220, avoiding interference between the first lead-out portion 220 and the diaphragm 213.

[0073] Specifically, the width N of the third groove 216 satisfies 4mm ≤ N ≤ 20mm, and the depth P of the third groove 216 satisfies 0mm < P ≤ 10mm. N can be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm, and P can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0074] In this way, the third groove 216 can effectively accommodate the first tab 230 and the first lead-out portion 220, facilitating the bending of the first tab 230. It can also reduce the distance between the electrode body 210 and the shell 100, increasing the energy density. Furthermore, it can ensure that the separator 213 completely covers the first electrode 211 and the second electrode 212. The separator 213 effectively separates the first electrode 211 and the second electrode 212, ensuring the insulation performance of the battery 1 and preventing the battery 1 from short-circuiting.

[0075] In some embodiments, such as Figure 2 As shown, the diaphragm 213 has an opening 215 located on at least one side of the second tab 240 in the width direction. On a projection plane parallel to the electrode body 210, the orthographic projection of the opening 215 and the orthographic projection of the second groove 260 at least partially overlap. This reduces the structural strength of the portion of the diaphragm 213 near the second tab 240, making it easier for the diaphragm 213 to deform when the second tab 240 is bent.

[0076] Specifically, when the second groove 260 penetrates the first surface 110, the opening 215 is located on the side of the second tab 240 facing away from the first surface 110. When the second groove 260 does not penetrate the first surface 110, the opening 215 is located on opposite sides of the second tab 240 in the width direction.

[0077] Specifically, in the depth direction of the opening 215, the distance K between the bottom wall of the opening 215 and the second electrode 212 satisfies K≥0.1mm, and in the width direction of the opening 215, the distance M between the side of the opening 215 facing away from the second electrode tab 240 and the second electrode 212 satisfies M≥0.1mm. In this way, the separator 213 can effectively cover the second electrode 212, ensuring effective separation between the first electrode 211 and the second electrode 212, guaranteeing the insulation performance of the battery 1, and preventing short circuits in the battery 1.

[0078] The width L of the opening 215 satisfies L≥0.1mm. In this way, the width of the opening 215 is large enough to avoid stress concentration caused by the opening 215 being too small, thereby reducing the probability of the separator 213 being damaged by stress and extending the service life of the battery 1.

[0079] In some embodiments, one of the first electrode 211 and the second electrode 212 is a positive electrode and the other is a negative electrode. The negative electrode has a negative current collector and a negative active layer. The negative active layer comprises a silicon-based material, and the mass percentage of silicon in the negative active layer is 10% to 70%. Specifically, the mass percentage of silicon in the negative active layer can be 10%, 20%, 30%, 40%, 50%, 60%, or 70%.

[0080] This approach not only increases the energy density of battery 1 but also prevents excessive expansion of the negative electrode, ensuring that the capacity retention rate of battery 1 does not decrease excessively after multiple cycles. Furthermore, when the silicon-doped negative electrode expands, the first electrode 211 and the second electrode 212 move relative to each other. Since the first tab 230 and the second tab 240 are located on different sides of the electrode body 210, they will not collide with each other, reducing the probability of damage to battery 1 and extending its service life.

[0081] Furthermore, such as Figure 1 As shown, the width of the first tab 230 is W1, and the minimum dimension of the opposite sides of the housing 100 in the width direction of the first electrode 211 is W3, where W1 / W3 ≥ 10%. For example, W1 / W3 can be 10%, 15%, 20%, 25%, or 30%.

[0082] The width of the second electrode tab 240 is W2. In the width direction of the second electrode plate 212, the minimum dimension of the opposite sides of the housing 100 is W4, and W2 / W4 ≥ 10%. For example, W2 / W4 can be 10%, 15%, 20%, 25% or 30%.

[0083] In this way, the connection dimensions of the first tab 230 and the second tab 240 to the electrode body 210 are large, which improves the connection reliability of the first tab 230 and the second tab 240 to the electrode body 210. In addition, the first tab 230 and the second tab 240 have high structural strength, which prevents the first tab 230 and the second tab 240 from being torn and damaged when the silicon-doped negative electrode sheet expands.

[0084] In some embodiments, such as Figure 1 and Figure 2 As shown, the housing 100 is electrically connected to the second electrode tab 240. When the first electrode 211 is the positive electrode and the second electrode 212 is the negative electrode, the housing 100 serves as the negative electrode lead-out portion, and the first lead-out portion 220 serves as the positive electrode lead-out portion; when the first electrode 211 is the negative electrode and the second electrode 212 is the positive electrode, the housing 100 serves as the positive electrode lead-out portion, and the first lead-out portion 220 serves as the negative electrode lead-out portion. In this case, the housing 100 can be a conductive metal, and the battery 1 can be a hard-shell battery, such as a steel-shell battery. This reduces the number of parts in the battery 1, lowering the cost.

[0085] The first lead-out portion 220 and the first electrode tab 230 can be directly welded, or the first lead-out portion 220 and the first electrode tab 230 can be welded through the first adapter piece 281; the housing 100 and the second electrode tab 240 can be directly welded, or the housing 100 and the second electrode tab 240 can be welded through the second adapter piece 282. Since the first tab 230 and the second tab 240 are located on different sides of the electrode body 210, in order to ensure that the electrode assembly 200 can be properly placed into the housing 100, the connection between the first tab 230, the second tab 240, the first lead-out portion 220 and the housing 100 includes the following three combinations: ① The first lead-out portion 220 and the first tab 230 are directly welded, and the housing 100 and the second tab 240 are welded through the second adapter piece 282; ② The first lead-out portion 220 and the first tab 230 are directly welded, and the housing 100 and the second tab 240 are directly welded; ③ The first lead-out portion 220 and the first tab 230 are welded through the first adapter piece 281, and the housing 100 and the second tab 240 are welded through the second adapter piece 282.

[0086] For example, such as Figures 5-12As shown, to ensure welding quality and the airtightness of battery 1, when the first lead-out portion 220 and the first tab 230 are directly welded, a first weld mark 271 is formed between the first lead-out portion 220 and the first tab 230. In the welding direction, the thickness of the first tab 230 is S1, and the thickness of the portion of the first lead-out portion 220 located inside the casing 100 is R1. The depth Q1 of the first weld mark 271 must satisfy R1≤Q1≤S1+R1. The first weld mark 271 extends from the first lead-out portion 220 to the first tab 230, with a thickness of 0.05mm≤R1≤2mm. 5mm≤S1≤0.5mm; When the first lead-out portion 220 and the first electrode 230 are welded through the first adapter piece 281, there is a second solder mark 272 between the first lead-out portion 220 and the first electrode 230. In the welding direction, the thickness of the first adapter piece 281 is S2, the thickness of the first lead-out portion 220 is R2, and the depth Q2 of the second solder mark 272 must satisfy R2≤Q2≤S2+R2. The second solder mark 272 extends from the first adapter piece 281 to the first lead-out portion 220, 0.05mm≤S2≤0.5mm, R2≥0.05mm.

[0087] When the housing 100 and the first electrode tab 230 are directly welded, a third weld mark 273 is formed between the housing 100 and the first electrode tab 230. In the welding direction, the thickness of the second electrode tab 240 is S3, and the thickness of the housing 100 is R3. The depth Q3 of the third weld mark 273 must satisfy R3≤Q3≤S3+R3. The third weld mark 273 extends from the housing 100 to the second electrode tab 240, with a thickness of 0.05mm≤R3≤2mm and 0.005mm≤S3≤0.5mm. When the housing 100 and the second tab 240 are welded together via the second adapter piece 282, a fourth weld mark 274 is formed between the housing 100 and the second tab 240. In the welding direction, the thickness of the second adapter piece 282 is S4, the thickness of the housing 100 is R4, and the depth Q4 of the fourth weld mark 274 must satisfy R4≤Q4≤S4+R4. The fourth weld mark 274 extends from the second adapter piece 282 to the housing 100, with 0.05mm≤S4≤0.5mm and R4≥0.05mm.

[0088] Or, such as Figures 13-17 As shown, the electrode assembly 200 also includes a second lead-out portion 290, which is connected to the second tab 240. The second lead-out portion 290 extends out of the housing 100 from the mounting surface 112. When the first electrode 211 is a positive electrode and the second electrode 212 is a negative electrode, the first lead-out portion 220 serves as the positive lead-out portion, and the second lead-out portion 290 serves as the negative lead-out portion. When the first electrode 211 is a negative electrode and the second electrode 212 is a positive electrode, the first lead-out portion 220 serves as the negative lead-out portion, and the second lead-out portion 290 serves as the positive lead-out portion. In this case, the battery 1 can be a hard-shell battery, such as a steel-shell battery, or a pouch battery.

[0089] The first surface 110 and the second surface 120 are arranged adjacent to each other. In this way, the distance between the first surface 110 and the second surface 120 is relatively small, which can reduce the size of the second lead 290 and avoid excessive reduction in the volume of the electrode body 210 to avoid the second lead 290, thereby improving the energy density of the battery 1.

[0090] When battery 1 is a pouch battery, the first lead-out portion 220 is provided with a first gel 221, and the second lead-out portion 290 is provided with a second gel 295. The first gel 221 and the second gel 295 are both connected to the top sealing edge of the pouch battery to fix the relative positions between the first lead-out portion 220, the second lead-out portion 290 and the housing 100.

[0091] The second lead-out portion 290 may include a rigid electrode tab 294 and an adapter piece 293. The rigid electrode tab 294 extends out of the housing 100 from the mounting surface 112. One end of the adapter piece 293 is connected to the second electrode tab 240, and the other end of the adapter piece 293 is connected to the rigid electrode tab 294. Both the second electrode tab 240 and the rigid electrode tab 294 are soldered to the adapter piece 293. A first solder protective adhesive 291 is provided at the connection between the adapter piece 293 and the second electrode tab 240. 3. A second solder protective adhesive 292 is provided at the connection between the rigid tab 294 and the rigid tab 294; or the second electrode 212 may include the rigid tab 294, but does not include the adapter piece 293. The rigid tab 294 is directly connected to the second tab 240, and the rigid tab 294 extends out of the housing 100 from the mounting surface 112. The rigid tab 294 is welded to the second tab 240, and a first solder protective adhesive 291 is provided at the connection between the rigid tab 294 and the second tab 240.

[0092] In both of the above methods, the welding points are covered with protective adhesive tape. Each welding point may have protective tape only on the outer side, or each welding point may have protective tape on both the inner and outer sides. The protective tape can prevent welding debris from moving within the casing 100, prevent corrosion of the welding points, and improve the insulation performance of the battery 1. Since the second lead-out portion 290 is led out through the top sealing edge, it does not affect the side sealing edge folding and adhesive application of the battery 1, thus avoiding a decrease in the energy density of the battery 1.

[0093] In this way, the battery 1 can be constructed in a more diverse manner, making it suitable for different usage scenarios and needs.

[0094] Furthermore, such as Figure 15 and Figure 16As shown, the first electrode 211 has a first clearance groove 217 on the side facing the first surface 110, the second electrode 212 has a second clearance groove 218 on the side facing the first surface 110, and the diaphragm 213 has a third clearance groove 219 on the side facing the first surface 110. The second lead-out portion 290 is located within the third clearance groove 219. On a projection plane parallel to the electrode body 210, the orthographic projection of the second clearance groove 218 is located within the first clearance groove 217, and the orthographic projection of the third clearance groove 219 is located within the second clearance groove 218.

[0095] By setting the first clearance groove 217, the second clearance groove 218, and the third clearance groove 219, not only can the second lead-out portion 290 be avoided, preventing interference between the second lead-out portion 290 and the first electrode 211, the second electrode 212, and the separator 213, but it can also ensure that the area of ​​the second electrode 212 is larger than the area of ​​the first electrode 211, that is, the area of ​​the negative electrode is larger than the area of ​​the positive electrode, reducing the probability of lithium plating in the battery 1. The area of ​​the separator 213 is larger than the area of ​​the first electrode 211 and the area of ​​the second electrode 212, so as to ensure that the separator 213 can effectively isolate the first electrode 211 and the second electrode 212, avoiding short circuit due to contact between the first electrode 211 and the second electrode 212, and improving the safety of the battery 1.

[0096] Specifically, the depth E1 of the first clearance groove 217 satisfies 0.1mm≤E1≤1mm. The depth E2 of the second clearance groove 218 satisfies 0.1mm≤E2≤1mm. The depth E1 of the third clearance groove 219 satisfies 0.5mm≤E3≤2mm. Among them, E1 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, E2 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, and E3 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm.

[0097] In this way, there is enough space to place the second lead-out portion 290, avoiding interference between the second lead-out portion 290 and the housing 100, the separator 213, the first electrode 211 and the second electrode 212, while ensuring that the volume of the first electrode 211 and the second electrode 212 is not reduced excessively, thus ensuring that the energy density of the battery 1 is relatively high.

[0098] The bending radius Z of the second lead-out part 290 satisfies 0.5mm≤Z≤8mm. Wherein, Z can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm or 8mm.

[0099] By setting the bending radius of the second lead-out portion 290 to be no less than 0.5 mm, interference between the second lead-out portion 290 and the electrode assembly 200 can be avoided. By setting the bending radius of the second lead-out portion 290 to be no greater than 8 mm, interference between the second lead-out portion 290 and the housing 100 can be avoided.

[0100] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, include: The housing (100) has a first surface (110) and a second surface (120). The first surface (110) has a raised surface and a mounting surface (112). The raised surface protrudes from the mounting surface (112) along the length direction of the battery (1) to form a protrusion (111). The raised surface and the mounting surface (112) are arranged along the width direction of the battery (1). The protective plate (300) is located on the mounting surface (112); An electrode assembly (200) is located inside the housing (100). The electrode assembly (200) includes an electrode body (210), a first lead-out portion (220), a first tab (230), and a second tab (240). The electrode body (210) has an extension portion (201) located on the protrusion (111). The first tab (230) is connected to the side of the electrode body (210) facing the first surface (110), and the second tab (240) is connected to the side of the electrode body (210) facing the second surface (120). The first lead-out portion (220) is connected to the first tab (230). The first lead-out portion (220) extends out of the housing (100) from the mounting surface (112). Both the first lead-out portion (220) and the second tab (240) are electrically connected to the protective plate (300).

2. The battery according to claim 1, characterized in that, Along the width direction of the battery (1), the protrusion (111) and the protective plate (300) are spaced apart; and / or, The height H of the protrusion (111) satisfies 0.5mm ≤ H ≤ 8mm; and / or, The mounting surface (112) has a dimension W in the width direction of the battery (1) that satisfies 10mm ≤ W ≤ 70mm; and / or, The first surface (110) and the second surface (120) are arranged adjacent to each other.

3. The battery according to claim 1, characterized in that, The electrode body (210) includes a first electrode (211), a second electrode (212), and a diaphragm (213). The first electrode (211), the second electrode (212), and the diaphragm (213) are stacked. The diaphragm (213) is disposed between the first electrode (211) and the second electrode (212). The first electrode (211) is connected to the first tab (230), and the second electrode (212) is connected to the second tab (240). The electrode body (210) is provided with at least one first groove (250) and at least one second groove (260), the first electrode tab (230) is disposed in the first groove (250), and the second electrode tab (240) is disposed in the second groove (260); and / or, The width A of the heat-affected zone (214) of the diaphragm (213) satisfies A≤0.3mm.

4. The battery according to claim 3, characterized in that, The first groove (250) includes a first sub-groove (251) and a second sub-groove (252). The first sub-groove (251) is disposed on the first electrode (211), and the second sub-groove (252) is disposed on the second electrode (212). The second groove (260) includes a third sub-groove (261) and a fourth sub-groove (262). The third sub-groove (261) is disposed on the first electrode (211), and the fourth sub-groove (262) is disposed on the second electrode (212). The distance B1 between the sidewall of the first sub-groove (251) in the width direction of the first electrode tab (230) and the first electrode tab (230) satisfies 1.5mm ≤ B1 ≤ 8.5mm; and / or, The depth C1 of the first sub-groove (251) satisfies 0mm < C1 ≤ 10mm; and / or, The width B2 of the second sub-groove (252) satisfies 6mm ≤ B2 ≤ 20mm; and / or, The depth C2 of the second sub-groove (252) satisfies 0mm < C2 ≤ 10mm; and / or, The width B3 of the third sub-groove (261) satisfies 5mm ≤ B3 ≤ 20mm; and / or, The depth C3 of the third sub-groove (261) satisfies 0mm < C3 ≤ 10mm; and / or, The distance B4 between the sidewall of the fourth sub-groove (262) in the width direction of the second pole ear (240) and the second pole ear (240) satisfies 1mm ≤ B4 ≤ 8mm; and / or, The depth C4 of the fourth sub-groove (262) satisfies 0mm < C4 ≤ 10mm; and / or, The distance between the bottom wall of the second sub-groove (252) and the shell (100) is D1, and the distance between the bottom wall of the fourth sub-groove (262) and the shell (100) is D2, where D1 ≥ D2.

5. The battery according to claim 3, characterized in that, The diaphragm (213) has a third groove (216), and the first tab (230) is disposed within the third groove (216). On a projection plane perpendicular to the thickness direction of the battery (1), the orthographic projection of the third groove (216) lies within the orthographic projection of the first groove (250); and / or, The diaphragm (213) has an opening (215) located on at least one side of the width direction of the second tab (240), and the orthographic projection of the opening (215) and the orthographic projection of the second groove (260) at least partially overlap on a projection plane perpendicular to the thickness direction of the battery (1).

6. The battery according to claim 5, characterized in that, In the depth direction of the opening (215), the distance K between the bottom wall of the opening (215) and the second electrode (212) satisfies K≥0.1mm; and / or, In the width direction of the second electrode tab (240), the distance M between the side of the opening (215) facing away from the second electrode tab (240) and the second electrode plate (212) satisfies M≥0.1mm; and / or, The width L of the opening (215) satisfies L≥0.1mm; and / or, The width N of the third groove (216) satisfies 4mm ≤ N ≤ 20mm; and / or, The depth P of the third groove (216) satisfies 0mm < P ≤ 10mm.

7. The battery according to claim 3, characterized in that, One of the first electrode (211) and the second electrode (212) is a positive electrode and the other is a negative electrode. The negative electrode has a negative current collector and a negative active layer. The negative active layer comprises a silicon-based material, and the mass percentage of silicon in the negative active layer is 10% to 70%; and / or, The width of the first electrode tab (230) is W1, and the minimum dimension of the opposite sides of the housing (100) in the width direction of the first electrode plate (211) is W3, where W1 / W3 ≥ 10%; and / or, The width of the second electrode tab (240) is W2, and the minimum dimensions of the opposite sides of the housing (100) in the width direction of the second electrode plate (212) are W4, with W2 / W4 ≥ 10%.

8. The battery according to claim 3, characterized in that, The housing (100) is electrically connected to the second electrode (240); or, The electrode assembly (200) further includes a second lead-out (290) connected to a second tab (240), the second lead-out (290) extending out of the housing (100) from the mounting surface (112).

9. The battery according to claim 8, characterized in that, The first electrode (211) has a first clearance groove (217) on the side facing the first surface (110), the second electrode (212) has a second clearance groove (218) on the side facing the first surface (110), the diaphragm (213) has a third clearance groove (219) on the side facing the first surface (110), and the second lead-out portion (290) is located in the third clearance groove (219); On the projection plane perpendicular to the thickness direction of the battery (1), the orthographic projection of the second clearance groove (218) is located within the first clearance groove (217), and the orthographic projection of the third clearance groove (219) is located within the second clearance groove (218).

10. The battery according to claim 9, characterized in that, The depth E1 of the first clearance groove (217) satisfies 0.1mm≤E1≤1mm; and / or, The depth E2 of the second clearance groove (218) satisfies 0.1mm≤E2≤1mm; and / or, The depth E1 of the third clearance groove (219) satisfies 0.5mm≤E3≤2mm; and / or, The bending radius Z of the second lead-out part (290) satisfies 0.5mm≤Z≤8mm.

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