Battery, battery apparatus, and electrical device

Abstract

The present application relates to the technical field of battery processing, and relates to a battery, a battery apparatus, and an electrical device. A battery cell electrode sheet comprises an electrode sheet body and connecting members, the electrode sheet body comprising a plurality of single electrode sheets arranged in a first direction, and a cut portion extending in a second direction being provided between two adjacent single electrode sheets. The first direction intersects the second direction. Each connecting member is separately connected to two adjacent single electrode sheets on two sides of the cut portion before the battery cell electrode sheet is wound. The electrode sheet body expands, so that the two adjacent single electrode sheets are disconnected at the cut portion. In the battery cell electrode sheet of the present embodiment, each cut portion is formed on the electrode sheet body by means of cutting, and then two adjacent single electrode sheets are connected by means of a connecting member. Compared with the traditional technical solution in which a battery cell electrode sheet having a fracture hole is formed by means of punching processing, waste generated in during electrode sheet processing can be effectively reduced, no additional specific cutter is required, and manufacturing costs can also be effectively reduced.

Description

Batteries, battery devices and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202411543522.6, filed on October 30, 2024, entitled “Battery Cell Electrode, Battery Cell, Battery and Electrical Device”, the entire contents of which are incorporated herein by reference.

[0002] This application claims priority to Chinese Patent No. 202411960484.4, filed on December 25, 2024, entitled “Flush assembly, battery, battery device and electrical equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and more particularly to a battery, battery device, and electrical equipment. Background Technology

[0004] In the field of battery technology, the structural design of cell electrodes has a significant impact on battery performance and manufacturing processes. In some existing technologies, by incorporating fracture holes, the cell electrode can be broken into multiple individual electrode pieces along the fracture holes after formation, which can effectively improve the processing efficiency of the cell electrode.

[0005] However, fracture holes on battery cell electrodes are often created using a punching process, which generates a significant amount of electrode waste, leading to unnecessary resource waste. Furthermore, this method requires a corresponding waste recycling system and specially shaped punching tools, significantly increasing production costs.

[0006] Therefore, it is necessary to address the aforementioned issues in order to improve the current situation. Summary of the Invention

[0007] This application provides a battery, battery device, and electrical equipment to solve the problem of excessive waste and high production costs caused by the use of punching to form fracture holes in the existing battery cell electrode processing.

[0008] A first aspect of this application provides a battery, including a cell, the cell comprising:

[0009] Diaphragm;

[0010] A first electrode is disposed on one side of the diaphragm; and

[0011] The second electrode is disposed on the side of the diaphragm opposite to the first electrode.

[0012] In one possible implementation, the battery cell includes battery electrode sheets, the battery electrode sheets comprising:

[0013] An electrode body includes multiple individual electrode sheets arranged along a first direction, and adjacent individual electrode sheets have a cut portion extending along a second direction, wherein the first direction intersects the second direction; and

[0014] A connector is provided, which is respectively connected to two adjacent single electrode sheets on both sides of the cut portion; the electrode body expands to disconnect the two adjacent single electrode sheets from the cut portion.

[0015] In one possible implementation, each of the individual electrode sheets includes an electrode portion and at least one tab portion, the tab portion being connected to at least one side of the electrode portion and located outside the cut portion;

[0016] The cutting portion is located between at least two adjacent electrode portions, and the two adjacent electrode portions are separated from the cutting portion.

[0017] In one possible implementation, the dimension of the cut portion in the second direction is not greater than the dimension of the electrode portion in the second direction.

[0018] In one possible implementation, the electrode portion includes a current collector and an active material layer, the active material layer being disposed on at least one side surface of the current collector, and the current collectors of two adjacent electrode portions being spaced apart to form the cut portion.

[0019] In one possible implementation, the connector is attached to the active material layer.

[0020] In one possible implementation, in the second direction, the size of the cut portion is H1, the size of the active material layer is H2, the size of the current collector is H3, and the size of the connector is H4, satisfying the following relationship:

[0021] 1 / 3H3≤H1≤H3;

[0022] And / or 1 / 3H3≤H4≤H3;

[0023] And / or H2≤H3.

[0024] In one possible implementation, at least a portion of the orthographic projection of the connector toward the electrode portion is located outside the active material layer.

[0025] In one possible implementation, the edge of the connector projecting orthogonally toward the electrode portion in the second direction is located between the edge of the active material layer and the edge of the current collector.

[0026] In one possible implementation, the edge of the connector on the side near the tab is located inside the current collector; the edge of the connector on the side away from the tab is at least partially located outside the electrode portion.

[0027] In one possible implementation, on the side of the connector away from the tab, the distance between the edge of the connector and the edge of the single electrode is W2, and W2 < 5 mm.

[0028] In one possible implementation, in the first direction, the size of the cut portion is K1, and 0 <K1<200mm;

[0029] And / or the distance between the edge of the connector and the edge of the cut portion inside the connector is K2, and 1mm. <K2<20mm。

[0030] In one possible implementation, the connector is an adhesive layer having an adhesive surface and a non-adhesive surface, the adhesive surface facing the single electrode.

[0031] In one possible implementation, the cutting portion is constructed as any one of a straight line, a serrated line, a wavy line, or a curved line.

[0032] In one possible implementation, the length dimension of the plurality of said individual electrodes gradually decreases along the first direction.

[0033] In one possible implementation, the length of the cell electrode is L, the length of the nth cell electrode is Ln, and the following relationship is satisfied: 3%L≤L1≤50%L.

[0034] In one possible implementation, along the first direction, the dimensions of the plurality of individual electrode sheets are L1, L2, ..., Ln, respectively, and satisfy the following relationship: 0 ≤ Ln-1 - Ln ≤ 1 / 2 Ln-1, where n is an integer and 2 ≤ n.

[0035] In one possible implementation, the length dimensions of the plurality of said individual electrodes are equal along the first direction.

[0036] In one possible implementation, the diaphragm, the first electrode, and the second electrode are wound to form the battery cell, wherein, in the extending direction of the battery cell electrodes, the size of the individual electrode located inside the battery cell is not less than the size of the individual electrode located outside the battery cell.

[0037] In one possible implementation, the battery includes a current collector assembly adapted to connect to a battery cell and comprising:

[0038] The disk body is adapted to be electrically connected to the battery cell;

[0039] A fuse element connected to the disc body, wherein the fuse element includes a first connecting portion adapted to connect to the cover plate of the battery;

[0040] In the thickness direction of the disk body, at least a portion of the orthographic projection of the first connecting portion overlaps with the orthographic projection of the disk body.

[0041] In one possible implementation, the orthographic projection of the first connecting portion is located within the orthographic projection of the disk body in the thickness direction of the disk body.

[0042] In one possible implementation, the center of the first connecting portion coincides with the center of the disk body.

[0043] In one possible implementation, the fuse further includes a second connecting portion and a fuse portion, wherein the second connecting portion is connected to the disk body;

[0044] One end of the fusible part is connected to the second connecting part, and the other end of the fusible part is connected to the first connecting part.

[0045] In one possible implementation, the flow area of ​​the second connection portion is larger than the flow area of ​​the fuse portion.

[0046] In one possible implementation, the longitudinal section is a cross section perpendicular to the disk body; the longitudinal cross-sectional area of ​​the fused portion is smaller than the longitudinal cross-sectional area of ​​the second connecting portion;

[0047] And / or, the longitudinal cross-sectional area of ​​the fused portion is smaller than the longitudinal cross-sectional area of ​​the first connecting portion.

[0048] In one possible implementation, the fuse element further includes a stress buffer portion disposed on the fuse element.

[0049] In one possible implementation, the stress buffer includes a plurality of interconnected buffer protrusions.

[0050] In one possible implementation, any two adjacent buffer protrusions protrude in opposite directions.

[0051] In one possible implementation, the protrusion direction of the buffer protrusion is parallel to the thickness direction of the fused portion; or, the protrusion direction of the buffer protrusion is perpendicular to the thickness direction of the fused portion.

[0052] In one possible implementation, the stress buffer portion includes a stress buffer layer that covers the fusible portion.

[0053] In one possible implementation, the fusible part is separate from both the first connecting part and the second connecting part, and the fusible part is a fuse.

[0054] In one possible implementation, the fuse portion includes at least two sub-fuse portions arranged at intervals from each other;

[0055] Each of the sub-fuse portions is used to connect the first connecting portion and the second connecting portion.

[0056] In one possible implementation, the fuse portion is provided with at least one partition hole, which divides the fuse portion into at least two sub-fusible portions.

[0057] In one possible implementation, the fusible portion includes a plurality of fusible portions, which are arranged at circumferential intervals along the first connecting portion.

[0058] In one possible implementation, the second connection portion includes at least one, and the plurality of the fuse portions are connected to the disk body through at least one of the second connection portions.

[0059] In one possible implementation, the disc body is provided with a first through hole, and the fuse is provided with a second through hole, wherein the first through hole and the second through hole at least partially overlap.

[0060] In one possible implementation, the second through hole is disposed in the first connecting portion, and the axis of the second through hole coincides with the axis of the first through hole.

[0061] In one possible implementation, the manifold assembly further includes an insulating element, which is at least partially disposed between the manifold body and the fuse.

[0062] In one possible implementation, the insulating element is provided with a third through hole that at least partially overlaps with a first through hole and at least partially overlaps with a second through hole, so that the first through hole and the second through hole are connected.

[0063] In one possible implementation, the axes of the first through hole, the second through hole, and the third through hole coincide.

[0064] In one possible implementation, the area of ​​the second through hole is greater than or equal to the area of ​​the third through hole;

[0065] And / or, the area of ​​the third through hole is greater than or equal to the area of ​​the first through hole.

[0066] In one possible implementation, the disk body is provided with at least one third connection portion, and at least one of the third connection portions is adapted to be connected to the battery cell.

[0067] In one possible implementation, the fuse is separate from the disk body.

[0068] In one possible implementation, the battery is a cylindrical battery.

[0069] In one possible implementation, the battery further includes:

[0070] The housing has an opening forming a receiving cavity; the battery cell is disposed in the receiving cavity;

[0071] A cover plate, which is connected to the outer casing and seals the opening;

[0072] The current collector assembly is disposed between the battery cell and the cover plate, and is connected to the battery cell and the cover plate respectively.

[0073] A second aspect of this application provides a battery device comprising the battery described in any of the above embodiments.

[0074] A third aspect of this application provides an electrical appliance,

[0075] Includes an electrical device and a battery as described in any one of the above, wherein the battery is connected to the electrical device and is used to provide electrical energy to the electrical device;

[0076] Alternatively, it may include an electrical device and a battery device as described in any of the preceding descriptions, wherein the battery device is connected to the electrical device and is used to provide electrical energy to the electrical device.

[0077] Implementing the embodiments of this application has the following beneficial effects:

[0078] In the battery cell electrode sheet of this embodiment, by forming a cutting portion on the electrode sheet body and then connecting two adjacent individual electrode sheets through a connector, the electrode sheet body can be broken at the cutting portion after fractionation to form multiple individual electrode sheets. Compared with the traditional battery cell electrode sheet technology that uses punching to form fracture holes, this can effectively reduce the waste generated during the electrode sheet processing. In addition, no special cutting tools are required, which can also effectively reduce manufacturing costs.

[0079] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the batteries, battery devices, and electrical equipment provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation methods. Attached Figure Description

[0080] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0081] Figure 1 shows a schematic diagram of the unfolded structure of the battery cell electrode sheet in an embodiment of this application;

[0082] Figure 2 shows a top view of the electrode structure of the battery cell in an embodiment of this application;

[0083] Figure 3 shows a schematic cross-sectional view of the battery cell in an embodiment of this application;

[0084] Figure 4 shows a schematic cross-sectional view of the electrode sheet of the battery cell in an embodiment of this application;

[0085] Figure 5 shows a cross-sectional schematic diagram of the battery cell electrode sheet during transportation in an embodiment of this application;

[0086] Figure 6 shows a schematic diagram of the unfolded structure of the battery cell electrode sheet in some embodiments of this application;

[0087] Figure 7 shows a schematic diagram of the unfolded structure of the battery cell electrode sheet in some embodiments of this application;

[0088] Figure 8 shows a schematic diagram of the structure of the manifold assembly provided in an embodiment of this application;

[0089] Figure 9 shows a schematic diagram of a fuse provided in an embodiment of this application;

[0090] Figure 10 shows a second schematic diagram of the fuse provided in an embodiment of this application;

[0091] Figure 11 shows a schematic diagram three of the fuse provided in the embodiments of this application;

[0092] Figure 12 shows a partial schematic diagram of a battery provided in an embodiment of this application.

[0093] Reference numerals: 1000 - Battery; 1 - Cell; 10 - Cell electrode; 10-1 - First electrode; 10-2 - Second electrode; 100 - Single-cell electrode; 110 - Electrode section; 111 - Cutting section; 112 - Current collector; 113 - Active material layer; 120 - Tab section; 200 - Connector; 20 - Separator; 2 - Conveyor roller; 300 - Outer casing; 310 - Receiving cavity; 400 - Cover plate; 500 - Current collector assembly; 510 - Disk body; 511 - First through hole; 512 - Third connecting part; 5121 - First sub-connecting part; 5122 - Second sub-connecting part; 520: Fusible element; 521: First connecting part; 522: Second connecting part; 523: Fusible part; 5231: Sub-fusible part; 5232: Separating hole; 524: Stress buffer part; 525: Second through hole; 530: Insulating element; 531: Third through hole. Detailed Implementation

[0094] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0095] For ease of description, referring to Figure 1, the X direction in the figure is defined as the first direction, and the Y direction in the figure is defined as the second direction. In the embodiment shown in Figure 1, the X direction is perpendicular to the Y direction. In this case, the first direction can be the length direction of the entire cell electrode 10, and the second direction can be the width direction of the cell electrode 10. Of course, in some embodiments, the first direction and the second direction can also intersect and be set at an angle, specifically 0-90°. The angle between the first direction and the second direction is specifically determined according to the design requirements of the cell electrode 10, and is not uniquely limited here.

[0096] Referring to Figures 1 to 7, this application provides a battery cell electrode 10, which includes an electrode body and a connector 200. The electrode body includes a plurality of individual electrode sheets 100 arranged along a first direction (e.g., the X direction), and there is a cut portion 111 extending along a second direction (e.g., the Y direction) between two adjacent individual electrode sheets 100. For example, as shown in Figure 1, the cut portion 111 extends along the Y direction to two edges in the width direction of the individual electrode sheet 100.

[0097] Before the cell electrode 10 is formed and tested, the connector 200 connects to two adjacent single electrode sheets 100 on both sides of the cutting section 111. After the cell electrode 10 is formed and tested, the electrode body expands, and the two adjacent single electrode sheets 100 break off from the cutting section 111. For example, before winding, the cell electrode 10 has two states: a connected state and a disconnected state. In the connected state, two adjacent single electrode sheets 100 on both sides of the cutting section 111 are partially connected. Before winding, multiple single electrode sheets 100 are connected by the connector 200 to form a continuous electrode body. Before winding, the connector 200 mainly serves to strengthen the connection between adjacent single electrode sheets 100 to ensure that the winding is continuous. When the cell electrode is applied to the battery, after the battery is formed and tested, the electrode 10 breaks off at the cutting section 111 due to expansion. In the open state, adjacent individual electrode sheets 100 cannot be electrically connected at the cutting section 111; in the open state, the electrode sheet 10 has been completely broken at the cutting section 111 before winding to form multiple individual electrode sheets 100. The two adjacent individual electrode sheets 100 connected by the connector 200 ensure the continuity of the electrode sheet 10 before winding. After winding, the two adjacent individual electrode sheets 100 have a gap along the extension direction of the individual electrode sheet 100. After the separation and formulation, the gap is further expanded, and the adjacent individual electrode sheets 100 cannot be electrically connected at the cutting section 111.

[0098] It should be noted that the capacity grading process refers to determining the battery capacity by charging and discharging the battery and detecting the discharge capacity when fully charged; the formation process refers to the process of charging the battery with a small current after electrolyte injection; during the formation and capacity grading stage, the cell electrode 10 can be expanded and the cell electrode 10 can be broken at the cutting part 111 to separate two adjacent single cell electrodes 100.

[0099] In the battery cell electrode 10 of this embodiment, by forming a cutting portion 111 on the electrode body and then connecting two adjacent individual electrode cells 100 through a connector 200, the electrode body can be broken at the cutting portion 111 after separation and capacity formation to form multiple individual electrode cells 100. Compared with the traditional battery cell electrode 10 technology that uses punching to form fracture holes, this can effectively avoid the waste generated during the electrode cell fracture hole processing. In addition, no additional specific cutting tools are required, which can also effectively reduce manufacturing costs.

[0100] Specifically, in some embodiments, the electrode body can be cut into cut portions 111 during the slitting stage by means of mechanical cutting or laser die cutting. However, for the prior art electrode solution that uses punching to form fracture holes with multiple spaced material discharges, a large amount of waste is generated during the punching process, and special punching tools are usually required to ensure fracture quality, which significantly increases manufacturing costs. In the embodiments of this application, cutting can be used to form cut portions 111 on the electrode 10, and two adjacent individual electrode 100s can be fixed by connectors 200. This can fix two adjacent individual electrode 100s to ensure the continuity of the electrode 10, facilitate die cutting of the electrode 10 to form tabs, and facilitate subsequent winding and conveying of the electrode 10.

[0101] It should be noted that, in this embodiment, the cut portion 111 between two adjacent individual electrode sheets 100 can be a completely severed seam, for example, after two adjacent individual electrode sheets 100 are cut, they are pulled apart by a certain distance, and the two adjacent individual electrode sheets 100 cannot be electrically connected by the cut end face. Alternatively, the cut portion 111 between two adjacent individual electrode sheets 100 can also be partially connected, for example, the two segments of the electrode sheets after being cut can be electrically connected by the cut end face or the partially cut position. During capacity formation, due to the expansion and fracture displacement of the electrode sheets, the adjacent electrode sheets are completely disconnected. In some embodiments, the connector 200 has a certain elasticity. This configuration ensures that during the winding or bending of the cell electrode sheet 10, the connector 200 can remain connected to the adjacent individual electrode sheet 100 inside the cell 1, so as to facilitate the processing of the cell electrode sheet 10 into the cell 1.

[0102] Specifically, referring to Figure 1, each individual electrode 100 includes an electrode portion 110 and at least one tab portion 120. The tab portion 120 is connected to at least one side of the electrode portion 110 and is located outside the cut portion 111.

[0103] Understandably, in the cell electrode 10, since the positive and negative electrodes need to be arranged correspondingly, the tabs 120 are usually located on one side of the electrode portion 110. This allows the positive and negative electrodes, after being separated by a separator, to have their tabs 120 located in different directions within the cell 1, thus preventing short circuits. When both sides of the cell electrode 10 have tabs 120, the positive and negative tabs 120 can be alternately arranged to avoid short circuits during the cell 1 process.

[0104] Therefore, in one possible implementation, a plurality of tabs 120 can be provided on one side of the electrode portion 110. When the cell electrode 10 is used in a full-tab battery, after the cell electrode 10 is wound and formed, the plurality of tabs 120 can be stacked on the same end of the battery (the same applies to the positive and negative electrodes). At this time, since the plurality of tabs 120 are stacked on each other, during the welding process, it can be ensured that as many tabs 120 as possible can be welded to the current collector to achieve electrical conduction. In addition, when there are some tabs 120 that are not welded to the current collector, these tabs 120 can also contact each other or contact the tabs 120 that have been welded to the current collector to achieve electrical conduction. When the cell electrode 10 is broken by the cutting portion 111 to form a plurality of individual electrode pieces 100, it is ensured that there is at least one effective tab 120 for electrical connection on the intermittent cell electrode pieces 10, thereby ensuring the circuit conduction performance of the battery.

[0105] Furthermore, when the cell electrode 10 is used in a cylindrical battery, if the tab 120 has the same length as the electrode portion 110 (i.e., the tab 120 is a single piece), it becomes inconvenient to bend the tab 120 towards the central axis of the cylindrical battery during the winding process of the cell electrode 10. Therefore, in this embodiment, by forming multiple spaced tabs 120 on the electrode portion 110, the cell electrode 10 can be easily wound and applied to a cylindrical battery. Of course, in some embodiments, when the cell electrode 10 is used in a sheet battery, since the tabs 120 do not need to be wound and stacked, the tabs 120 can also be a single piece corresponding to the electrode portion 110; this will not be elaborated upon here.

[0106] Furthermore, at least some of the adjacent two electrode portions 110 have a cutting portion 111 between them, and the adjacent two electrode portions 110 are separated from the cutting portion 111.

[0107] In the battery cell electrode 10 of this embodiment, the processing location of the cutting portion 111 generally needs to avoid the tab portion 120 to prevent cutting off the tab portion 120 during the cutting process and to avoid damaging the tab portion 120. In the specific processing, the processing position of the cutting portion 111 can be set by high-precision processing control, or the processing position of the cutting portion 111 can be reserved in the tabless area. The specific location is determined according to the design requirements of the battery cell electrode 10 and is not limited here. Of course, in some embodiments, the cutting portion 111 can be omitted between two adjacent electrode portions 110 to keep them tightly connected.

[0108] In one specific embodiment, the dimension of the cutting portion 111 in the second direction is not greater than the dimension of the electrode portion 110 in the second direction.

[0109] Referring to Figure 1, the dimension of the cutting portion 111 in the second direction is H1, and the dimension of the electrode portion 110 in the second direction is H3. H1 and H3 satisfy the following relationship: H1 ≤ H3. During the specific processing of the electrode 10, the cutting portion 111 may or may not penetrate the electrode 10 in the second direction. When the cutting portion 111 does not penetrate the electrode 10 in the second direction, two adjacent individual electrode pieces 100 can maintain a micro-connection at the cutting portion 111. This arrangement ensures that even if the individual electrode pieces 100 are not separated at the cutting portion 111, they can still be disconnected at the cutting portion 111 after capacity formation. When the cutting portion 111 of the electrode 10 is disconnected in the second direction, the two separated adjacent individual electrode pieces 100 can also be connected by the connector 200 to ensure the continuity of the electrode 10.

[0110] Referring to Figures 1 and 2, in one embodiment, the electrode portion 110 includes a current collector 112 and an active material layer 113. The active material layer 113 is disposed on at least one side surface of the current collector 112, and the current collectors 112 of two adjacent electrode portions 110 are spaced apart to form a cut portion 111.

[0111] Specifically, in some embodiments, the connector 200 can be disposed on one side of the current collector 112, or simultaneously on both sides of the current collector 112, and corresponds to at least one layer of active material 113. The specific arrangement is determined according to the design requirements of the cell electrode 10, and is not limited here. By forming a cut portion 111 between two adjacent individual electrode sheets 100, the active material layers 113 on the two adjacent current collectors 112 can be completely disconnected or micro-connected. When the active material layer 113 is completely disconnected, the two adjacent active material layers 113 cannot be electrically connected through the break of the cut portion 111. The micro-connection of the two adjacent active material layers 113 means that after the individual electrode sheet 100 is cut, the two adjacent individual electrode sheets 100 are directly connected through the connector 200. The two cut segments of the individual electrode sheet 100 can be electrically connected by the break end face or the incompletely cut position, and the expansion of the cell electrode sheet 10 during the formation process can achieve fracture displacement, so that the two adjacent individual electrode sheets 100 can be completely disconnected.

[0112] In some embodiments, the connector 200 is connected to the active material layer 113.

[0113] In this embodiment, when the connector 200 is connected to two individual electrode plates 100 respectively, if the electrode portions 110 of the two individual electrode plates 100 are provided with active material layers 113 on the same side, the connector 200 can contact the active material layers 113 on the two current collectors 112 respectively on the same side. In some embodiments, when the two adjacent electrode portions 110 are not provided with active material layers 113 on the same side, the connector 200 can also be connected to the current collector 112 of one electrode portion 110 and the active material layer 113 of the other electrode portion 110 respectively. Of course, when the two adjacent electrode portions 110 are not provided with active material layers 113 on the same side, the connector 200 can also be connected to the two current collectors 112 at the same time, which is not a unique limitation here.

[0114] Further, referring to Figure 1, in the second direction, the size of the cutting part 111 is H1, the size of the active material layer 113 is H2, the size of the current collector 112 is H3, and the size of the connector 200 is H4, and they satisfy the following relationships: 1 / 3H3≤H1≤H3; and / or 1 / 3H3≤H4≤H3; and / or H2≤H3.

[0115] In this embodiment, by setting the length of the cutting portion 111 in the second direction to between 1 / 3H3 and H3, it is ensured that the cell electrode 10 can be broken and displaced through expansion after being broken down and sized, so that two adjacent individual electrode pieces 100 can be separated to form multiple individual electrode pieces 100. Furthermore, the active material layer 113 is preferably disposed within the range of the current collector 112 in the second direction. In this case, the connector 200 can extend beyond the range of the active material layer 113 in the second direction and contact the current collector 112. By setting the length H4 of the connector 200 in the second direction to between 1 / 3H3 and H3, it is ensured that the individual electrode pieces 100 can be connected by the connector 200, thus ensuring continuity during winding.

[0116] Specifically, at least a portion of the orthographic projection of the connector 200 toward the electrode portion 110 is located on the outer side of the active material layer 113.

[0117] In some embodiments, when the width H2 of the active material layer 113 in the second direction is less than the width H3 of the current collector 112, the connector 200 can simultaneously cover the current collector 112 and the tab 120 in the second direction, so that the connector 200 and the single electrode 100 have a larger contact range, thereby improving the connection strength of the connector 200.

[0118] In one embodiment, the edge of the connector 200 projecting toward the electrode portion 110 in the second direction is located between the edge of the active material layer 113 and the edge of the current collector 112.

[0119] This configuration ensures the connection strength between the connector 200 and the single electrode 100 while preventing the end of the connector 200 from extending beyond the current collector 112, thus preventing the connector 200 from contacting the tab 120 and affecting the welding quality of the tab 120.

[0120] In the specific embodiment shown in FIG1, the edge of the connector 200 on the side near the tab 120 is located inside the current collector 112; the edge of the connector 200 on the side away from the tab 120 is at least partially located outside the electrode portion 110.

[0121] As shown in Figure 1, in this embodiment, the upper edge of the connector 200 (located on the side closer to the tab 120) extends beyond the active material layer 113 by a distance of W1, and the lower edge of the connector 200 (located on the side away from the tab 120) extends beyond the single electrode 100 by a distance of W2. In this embodiment, W2 < 5 mm and satisfies the following relationship: W1 < H3 - H2, 1 / 3 H3 < H4 ≤ H3.

[0122] By setting W1 < H3 - H2, when H3 > H2 (i.e., the edge of the active material layer 113 near the tab 120 is located inside the current collector 112), it can be ensured that the connector 200 can maintain connection with the single electrode 100 while shielding the cut section 111 after the battery cell electrode 10 is cut into segments and glued. At the same time, since the edge of the connector 200 near the tab 120 is located inside the current collector 112, it can also avoid cutting the connector 200 when the tab 120 is die-cut, ensuring the quality of the tab die-cutting and avoiding the waste material sticking when cutting the connector 200.

[0123] After the cell electrode 10 is die-cut to form the tab 120, the connector 200 is prevented from extending beyond the electrode portion 110 (i.e., the root of the tab 120). This prevents the connector 200 from being trapped in the tab 120 after the cell electrode 10 is wound and formed, thus affecting the welding quality of the current collector and effectively improving the electrical connection performance of the cell electrode 10. Simultaneously, by setting W2 < 5mm, it is ensured that the lower side of the connector 200 (the side away from the tab 120) does not extend beyond the lower side of the electrode portion 110 (the side away from the tab 120). After the cell electrode 10 is wound and formed, the connector 200 is prevented from being trapped in the tab of another electrode and affecting the welding of the current collector, thus effectively improving the overall electrical connection performance of the cell 1.

[0124] Specifically, referring to FIGS. 1 and 2, in the first direction, the size of the cutting portion 111 is K1, and 0 < K1 < 200 mm; or the distance between the edge of the connecting member 200 and the edge of the cutting portion 111 inside the connecting member 200 is K2, and 1 mm < K2 < 20 mm.

[0125] In a specific embodiment, after the single electrode sheet 100 is cut and separated, the two adjacent single electrode sheets 100 can be pulled away from each other by a distance of K1 and then connected by the connecting member 200. At this time, the connecting member 200 can be provided on the active material layer 113 on at least one side to ensure the overall continuity of the electrode sheet 10 of the battery cell. Referring to FIG. 4, in one embodiment, the connecting member 200 can be equal to the circumference of the wound battery cell 1. In the schematic diagram of the electrode sheet 10 of the battery cell after winding as shown in FIG. 4, at this time, since the connecting member 200 winds around the circumference of the battery cell 1 and connects the two single electrode sheets 100 respectively, it is possible to prevent the single electrode sheets 100 from intersecting each other and generating thickness accumulation in one direction in the radial direction of the battery cell 1, so that the thickness in the circumferential direction of the battery cell 1 is more uniform, and as much as possible reduce the influence of stress concentration caused by thickness difference accumulation inside the battery cell 1, improve the cycle performance of the battery cell 1. The length K1 of the cutting portion 111 can be specifically determined according to the design requirements of the battery cell 1, and can be the circumference of the battery cell 1 or multiple circumferences, and is not uniquely limited here.

[0126] In some embodiments, when K1 is set closer to the upper limit. The connecting member 200 can preferably be a tape made of a material such as polyethylene, polyvinyl chloride, aluminum foil peeling fiber cloth, etc. that has a certain viscosity and better flame retardant effect. Optionally, the material of the connecting member 200 can be a swelling tape containing polyurethane components, etc., to improve the infiltration of the electrolyte in the electrode core and enhance the liquid retention capacity of the battery cell.

[0127] At the same time, by setting 1 mm < K2 < 20 mm, the contact range of the connecting member 200 with the single electrode sheet 100 in the first direction can be ensured, thereby further improving the overall connection strength of the electrode sheet 10 of the battery cell. The specific setting of K2 needs to satisfy that the single electrode sheet 100 of the electrode sheet 10 of the battery cell does not break before winding. When K2 is too small, the electrode sheet 10 of the battery cell is likely to break, and when K2 is too large, too much active material layer 113 will be wasted due to covering too much active material layer 113, which will affect the electrical performance of the battery cell 1.

[0128] In one embodiment, the connecting member 200 is an adhesive layer, and the adhesive layer has an adhesive surface and a non-adhesive surface, and the adhesive surface faces the single electrode sheet 100.

[0129] Referring to Figure 5, in this embodiment, the connector 200 is an insulating tape. When the connector 200 is only located on one side of the active material layer 113, the adhesive surface on the connector 200 is in contact with the single electrode 100. By removing the adhesive from the connector 200, a non-adhesive surface is formed on the connector 200. At this time, the non-adhesive surface is located at the cut portion 111 between two adjacent single electrode 100s. The range of the adhesive removal process is within the range D in Figure 5. With this setting, when the cell electrode 10 is conveyed by the conveying roller 2, the part of the connector 200 facing the conveying roller 2 and located within the cut portion 111 is a non-adhesive surface. When the connector 200 at this point contacts the conveying roller 2, adhesion between the connector 200 and the conveying roller 2 can be avoided. Thus, the conveying quality of the cell electrode 10 can be guaranteed while reducing the overall thickness of the cell electrode 10.

[0130] Of course, when both sides of the active material layer 113 are provided with connectors 200, the portions of the connectors 200 on both sides of the cell electrode 10 located within the cutting portion 111 can contact and adhere to each other regardless of whether they have adhesive surfaces, so as to avoid contact between the adhesive surfaces of the connectors 200 and external components such as the conveyor roller 2. In other embodiments, the connectors 200 can also be connected and fixed to the individual electrode 100 by means of pressing, fusion welding, etc., which is not the only limitation here.

[0131] As shown in Figure 6, the cutting section 111 can be constructed in any of the following shapes: straight, sawtooth (as shown in Figures 6(a) and 6(b)), wavy (as shown in Figure 6(c)), or curved. The specific shape is determined according to the design requirements of the cell electrode 10, and no single limitation is made here.

[0132] In this embodiment, the length of the plurality of individual electrode sheets 100 gradually decreases along the first direction.

[0133] Referring to Figure 7(a), the overall length of the cell electrode 10 is L. After the cell electrode 10 is cut, the lengths of the individual electrode pieces 100 are L1, L2, ..., Ln, where L1 + L2 + ... + Ln = L, and L1 > L2 > ... > Ln. The individual electrode piece 100 of length L1 is located inside the cell 1, and the individual electrode pieces 100 of lengths L2, ..., Ln are arranged sequentially along the spiral direction of the cell 1 towards the outer ring. This arrangement ensures that the capacity of the small electrode pieces in the outer ring of the cell 1 is minimized. When an external force causes a short circuit failure in the outer ring of the cell 1, the failed electrode piece can be limited to the outermost small electrode piece or the second outermost electrode piece, reducing the overall failure risk of the cell 1 and thus effectively improving the safety performance of the cell 1. Specifically, the dimensions of L1, L2, ..., Ln gradually decrease, optionally by a fixed proportion of the piece length, or by a fixed proportion of the capacity of the individual electrode piece 100, or by a fixed proportion of the number of turns, etc. To improve the overall safety performance of cell 1, the single electrode 100 of the last Ln preferably meets the following requirements: the specific energy of the small electrode core where Ln is located is ≤400Wh / L, or the specific energy of the electrode core is ≤200Wh / kg.

[0134] Referring to Figure 7(b), in some other embodiments of this application, after the cell electrode 10 is cut, the lengths of the segments of the individual electrode 100 are L1, L2, ..., Ln, etc., where L1 + L2 + ... + Ln = L0, L1 = L2 = ... = Ln. In other embodiments, L1 ≠ L2 ≠ ... ≠ Ln or a combination of multiple cases. L1, L2, ..., Ln, etc., can be set according to the electrode length, capacity, number of turns, etc.

[0135] In this embodiment, the length of the cell electrode 10 is L, and the length of the nth individual electrode 100 is Ln, satisfying the following relationship: 3%L≤L1≤50%L, where n is an integer and 2≤n. Along the first direction, the dimensions of the multiple individual electrode 100s are L1, L2, ..., Ln, satisfying the following relationship: 0≤Ln-1-Ln≤1 / 2Ln-1, where n is an integer and 2≤n.

[0136] Referring to Figure 3, this application embodiment also provides a battery cell 1, which includes a first electrode 10-1, a second electrode 10-2, and a separator 20; the first electrode 10-1 is disposed on one side of the separator 20; the second electrode 10-2 is disposed on the side of the separator 20 opposite to the first electrode 10-1; wherein the first electrode 10-1 and / or the second electrode 10-2 include the battery cell electrode 10 in any of the above embodiments, and either the first electrode 10-1 or the second electrode 10-2 can be a positive electrode and the other can be a negative electrode.

[0137] It is understood that in the battery cell 1 of this embodiment, by setting the battery cell electrode 10 in any of the above embodiments, the battery cell electrode 10 of this embodiment forms a cutting portion 111 by cutting on the electrode body, and then two adjacent individual electrode sheets 100 are connected by the connector 200. After the electrode body is divided and tested, it can be broken at the cutting portion 111 to form multiple individual electrode sheets 100. Compared with the traditional battery cell electrode 10 technology that uses punching to form a fracture hole, it can effectively reduce the waste generated during the electrode processing, and at the same time, it does not require additional specific tools, and can also effectively reduce manufacturing costs, thereby reducing the overall manufacturing cost of battery cell 1.

[0138] Specifically, when the battery cell 1 has a wound structure, during the cycling process, the battery cell 1 will generate an expansion force that diffuses from the inside out. When the expansion force is too large, the brittleness of the battery cell electrode 10 may cause the battery cell electrode 10 to tear. In this embodiment, the battery cell electrode 10, through the above-mentioned arrangement, allows the battery cell 1 to completely break apart during the subsequent formation and capacity testing stage when the battery cell electrode 10 is cut with micro-connectors, as the battery cell electrode 10 can be displaced at the cutting part 111 under the expansion force. Each segment of the battery cell electrode 10 has at least one effective tab 120, which allows the battery cell electrode 10 to maintain electrical connection after breakage, ensuring the electrochemical performance of the battery cell 1 and improving the service life of the battery cell 1. When the battery cell electrode 10 is completely cut and pulled apart, the segmented individual electrode 100 is connected by the connector 200, ensuring the continuity of the battery cell electrode 10 before winding and maintaining the multi-segment characteristics of the battery cell electrode 10 in the battery cell 1.

[0139] In some embodiments, the positive electrode can be the cell electrode 10 of any of the above embodiments. Similarly, in some embodiments, the negative electrode can also be the cell electrode 10 of any of the above embodiments, and is segmented corresponding to the positive electrode. Each segment of the negative electrode has at least one tab 120. Alternatively, the negative electrode can be a continuous structure corresponding to the positive electrode, and preferably, the negative electrode covers the positive electrode. In this embodiment, the connector 200 can separate the outer ring small electrode core from the inner ring small electrode core. The flame-retardant material can reduce the risk of short circuits caused by the outer ring affecting the inner ring small electrode core, thus improving the safety performance of the cell 1.

[0140] In the embodiment, the diaphragm 20, the first electrode 10-1 and the second electrode 10-2 are wound to form the battery cell 1. In the extending direction of the battery cell electrode 10, the size of the single electrode 100 located inside the battery cell 1 is not less than the size of the single electrode 100 located outside the battery cell 1.

[0141] This configuration ensures that the capacity of the outermost small electrode core of cell 1 is minimized. In the event of a short circuit failure of the outer ring of cell 1 due to external forces, the failed electrode core can be limited to the outermost small electrode core or the second outermost electrode core, reducing the overall failure risk of cell 1 and effectively improving its safety performance. Specifically, the dimensions of L1, L2, ..., Ln gradually decrease, optionally by a fixed ratio based on the sheet length, a fixed ratio based on the capacity of a single electrode 100, or a fixed ratio based on the number of turns, etc. To improve the overall safety performance of cell 1, the single electrode 100 at the very end Ln preferably satisfies a specific energy of ≤400Wh / L for the small electrode core containing Ln, or a specific energy of ≤200Wh / kg for the electrode core.

[0142] This application also provides a battery comprising the cell electrode 10 of any of the above embodiments, or the cell 1 of any of the above embodiments; wherein, a plurality of individual electrode sheets 100 expand after formation and capacity testing and break off from the cut portion 111.

[0143] It is understood that in the battery of this embodiment, by setting the cell electrode 10 in any of the above embodiments, the cell electrode 10 of this embodiment is formed by cutting a cutting portion 111 on the electrode body, and then two adjacent single electrode pieces 100 are connected by a connector 200. After the formation and capacity testing, the electrode body can be broken at the cutting portion 111 to form multiple single electrode pieces 100. Compared with the traditional technical solution of cell electrode 10 that uses punching to form a fracture hole, it can effectively reduce the waste generated during the electrode processing, and at the same time, it does not require additional specific tools, and can also effectively reduce the manufacturing cost, thereby reducing the manufacturing cost of the battery and improving the safety of the battery.

[0144] In one embodiment, the battery is a cylindrical battery.

[0145] Specifically, cylindrical batteries generate an expansion force that diffuses from the inside out during cycling. When the expansion force is too large, the brittleness of the positive electrode sheet may cause it to tear. By using the cell electrode sheet 10 in any of the above embodiments, the positive electrode sheet can be displaced at the cut point and completely broken when subjected to the expansion force during the subsequent formation and capacity testing stage. Each segment of the positive electrode sheet has at least one effective tab 120, which allows the positive electrode sheet to maintain electrical connection after breakage, ensuring the electrochemical performance of the battery and improving its lifespan. When the positive electrode sheet is completely cut and pulled apart, the segmented electrode sheets are connected by the connector 200, ensuring the continuity of the positive electrode sheet before winding and maintaining the multi-segment characteristics of the positive electrode sheet in the cell 1. The cylindrical battery uses a continuous winding method during winding, which can avoid misalignment caused by adhesive bonding of multi-segment electrode sheets and improve production efficiency. Of course, in some embodiments, the battery can also be a flat battery, which is not the only limitation.

[0146] In some embodiments, referring to FIG12, the battery 1000 includes a housing 300, which serves as the main component of the battery 1000 and provides support for other components of the battery 1000. A receiving cavity 310 with an opening is formed within the housing 300.

[0147] The battery 1000 also includes a battery cell 1 and a cover plate 400. The battery cell 1 is disposed in the receiving cavity 310. The cover plate 400 is connected to the outer casing 300 and seals the opening so that the outer casing 300 and the cover plate 400 enclose each other to form a sealed structure.

[0148] The battery 1000 also includes a current collector assembly 500 as described in the first aspect, the current collector assembly 500 being disposed between the battery cell 1 and the cover plate 400, and being connected to the battery cell 1 and the cover plate 400 respectively.

[0149] When cell 1 is working, the current flows from cell 1 through the disk 510 of the current collector assembly 500 and then through the fuse 520, and through the first connection part 521 of the fuse 520 to the cover plate 400 and the external circuit. When cell 1 experiences thermal runaway, because the current-carrying cross-section of the fuse part 523 of the fuse 520 is smaller than other areas, it can achieve point-to-point melting and cut off the main current circuit. At this time, the circuit current will drop sharply or return to zero to avoid further deterioration of thermal runaway, prevent fire and explosion, and improve the safety of battery 1000.

[0150] The current collector assembly 500 serves as a connecting bridge to connect the cover plate 400 and the battery cell 1 (see Figure 12) to achieve electrical connection between the conductive parts of the cover plate 400 and the battery cell 1. For example, one end of the current collector assembly 500 can be connected to the terminal post disposed on the cover plate 400, and the other end can be connected to the electrode tab of the battery cell 1 to achieve electrical connection between the electrode tab and the terminal post.

[0151] Please refer to Figures 8 to 11. The current collector assembly 500 includes a disk body 510, which is adapted to be electrically connected to the battery cell 1. It should be noted that when the battery cell 1 includes a tab portion 120 (see Figure 1), the disk body 510 is adapted to be electrically connected to the tab portion 120 of the battery cell 1. The shape of the disk body 510 can be freely set according to the shape of the battery 1000. For example, in this embodiment, the battery 1000 is a cylindrical battery, and correspondingly, the disk body 510 is a circular disk. Thus, the shape of the disk body 510 can be adapted to the shapes of the battery cell 1 and the cover plate 400, reducing the difficulty of connecting the disk body 510 to the battery cell 1 and the cover plate 400, while also ensuring connection quality.

[0152] The following embodiments are all described with the disk body 510 being circular as an example.

[0153] The collector assembly 500 also includes a fuse 520, which is connected to the disk body 510. In this embodiment, the fuse 520 is connected to the disk body 510, which can be understood as the fuse 520 and the disk body 510 being an integral part. This simplifies the manufacturing process of the collector assembly 500 and also has the advantages of high structural strength and high stability.

[0154] The connection between the fuse 520 and the disk 510 can also be understood as the fuse 520 and the disk 510 being separate components. In other words, the fuse 520 and the disk 510 are two independent parts. The fuse 520 can be fixedly connected to the disk 510 using conventional fixing methods, such as welding. This allows the connection position between the fuse 520 and the disk 510 to be adjusted reasonably according to actual needs.

[0155] The fuse 520 can be made of a conductive material that can be melted under certain heat. For example, the fuse 520 can be, but is not limited to, a fuse. When the battery experiences thermal failure or a short circuit, the fuse melts, which can cut off the electrical connection between the cell 1 and the cover plate 400, thereby improving the safety of the battery.

[0156] The fuse 520 includes a first connecting portion 521 adapted to connect to the cover 400 of the battery 1000. At least a portion of the orthographic projection of the first connecting portion 521 overlaps with the orthographic projection of the disk 510 in the thickness direction of the disk body 510. In one example, a portion of the orthographic projection of the first connecting portion 521 overlaps with the orthographic projection of the disk body 510 in the thickness direction of the disk body 510. In other words, the orthographic projection of a portion of the first connecting portion 521 on the plane of the disk body 510 overlaps with the disk body 510. Alternatively, the orthographic projection of a portion of the first connecting portion 521 falls onto the disk body 510, while the orthographic projection of a portion of the first connecting portion 521 does not fall onto the disk body 510. In another example, the orthographic projection of the first connecting portion 521 lies within the orthographic projection of the disk body 510 in the thickness direction of the disk body 510.

[0157] In this way, the disk body 510 can provide support for at least part of the first connection portion 521. This support can reduce the downward displacement of the first connection portion 521 of the fuse 520 under the action of gravity or other factors, thereby reducing or even avoiding the gap formed between the first connection portion of the fuse 520 and the cover plate 400, thus preventing the formation of poor solder joints between the fuse 520 and the cover plate 400 and improving the battery yield. In addition, the absence of poor solder joints between the current collector assembly 500 and the cover plate 400 allows for a tight fit between the fuse 520 and the disk body 510, as well as a stable connection between the fuse 520 and the cover plate 400, thereby ensuring a more stable electrical connection for the entire current collector assembly 500 and ensuring effective current transmission.

[0158] It should be noted that other factors involved in this embodiment may include dimensional deviations in the fuse element 520 or deformation of the fuse element 520, resulting in a gap between the first connecting portion 521 of the fuse element 520 and the cover plate 400.

[0159] In this example, the fuse 520 and the disc 510, the fuse 520 and the cover plate 400, and the disc 510 and the electrode tab of the electrode core can all be connected by welding. For example, laser welding or ultrasonic welding can be used to achieve the connection between the fuse 520 and the disc 510, the connection between the fuse 520 and the electrode post of the cover plate 400, and the connection between the disc 510 and the electrode tab of the electrode core.

[0160] In one possible implementation, when the orthographic projection of the first connection portion 521 lies within the orthographic projection of the disk body 510, the center of the first connection portion 521 coincides with the center of the disk body 510, or they may not coincide. Exemplarily, the center of the first connection portion 521 coincides with the center of the disk body 510. This design allows the current to be distributed more evenly across the current collector assembly 500, reducing the risk of current concentration and heat buildup, thereby improving battery performance and safety.

[0161] It should be noted that the center of the first connecting portion 521 can refer to the geometric center of the first connecting portion 521, or a point adjacent to the geometric center of the first connecting portion 521. The geometric center can be the centroid or center point of the first connecting portion 521.

[0162] For example, if the first connecting portion 521 is circular, then the center of the first connecting portion 521 can be the center of the circle. When the first connecting portion 521 is circular, it can better match the cylindrical cover plate 400, improving the connection stability between the first connecting portion 521 and the cover plate 400.

[0163] Please refer to Figures 9 to 11. The fuse 520 provided in this embodiment further includes a second connecting portion 522 and a fuse portion 523. The second connecting portion 522 is connected to the disk body 510. For example, the second connecting portion 522 is welded to the disk body 510, wherein all of the second connecting portions 522 are welded to the disk body 510 to improve the structural strength of the fuse 520 and the disk body 510.

[0164] One end of the fuse 523 is connected to the second connecting part 522, and the other end of the fuse 523 is connected to the first connecting part 521. Thus, the fuse 520 can connect the disc 510 and the cover plate, thereby achieving the connection between the cover plate and the electrode tabs of the electrode core. When a short circuit occurs in the battery, the fuse 520 melts, which can cut off the electrical connection between the cell 1 and the cover plate 400, thereby improving battery safety.

[0165] In this example, the overcurrent area of ​​the second connection portion 522 is larger than the overcurrent area of ​​the fuse portion 523, thus ensuring that the fuse portion 523 melts preferentially. Therefore, when an abnormality occurs in the internal or external circuit of the battery 1000, the current can be quickly cut off, preventing further escalation of the fault and improving the safety of the battery 1000. It should be noted that the overcurrent area can be the cross-sectional area through which current flows through a conductive component.

[0166] In one possible implementation, taking the section perpendicular to the disk 510 as the longitudinal section, the longitudinal cross-sectional area of ​​the fuse portion 523 is smaller than the longitudinal cross-sectional area of ​​the second connecting portion 522; and / or, the longitudinal cross-sectional area of ​​the fuse portion 523 is smaller than the longitudinal cross-sectional area of ​​the first connecting portion 521. This ensures that the longitudinal cross-sectional area of ​​the fuse portion 523 is minimized; when a large current passes through the fuse element 520, the fuse portion 523 preferentially melts, thereby improving the safety performance of the battery 1000.

[0167] As an example, in the first direction, the fusible portion 523 protrudes at least one side of the second connecting portion 522, such that the shape of the fusible portion 523 and the second connecting portion 522 is L-shaped, or the shape of the fusible portion 523 and the second connecting portion 522 is T-shaped.

[0168] It should be noted that, taking the orientation shown in Figure 9 as an example, the first direction is direction M in Figure 9. Alternatively, the first connecting part 521 and the second connecting part 522 are connected by a perpendicular line, and the first direction is perpendicular to this perpendicular line.

[0169] In this way, the longitudinal cross-sectional area of ​​the fuse part 523 is minimized. When the battery 1000 experiences thermal failure or abnormal current, the fuse part 523 can respond quickly and melt, causing the first connection part 521 and the second connection part 522 to disconnect rapidly, thereby achieving electrical disconnection between the cell 1 and the cover plate 400.

[0170] At the same time, the longitudinal cross-sectional areas of the first connecting part 521 and the second connecting part 522 are relatively large, which can increase the contact area between the first connecting part 521 and the cover plate 400, and the release area between the second connecting part 522 and the disk body 510, thereby improving the structural strength of the current collector assembly 500 itself, as well as the structural strength between the current collector assembly 500 and the cover plate 400. This helps to prevent the connection from loosening or breaking under daily use and vibration environment, and ensures the long-term stable operation of the battery system.

[0171] In one possible implementation, the fuse 520 further includes a stress buffer 524 disposed on the fuse 523. The stress buffer 524 can buffer vibrations that may occur during battery operation, reducing the risk of loosening or breakage of the fuse 520 due to external factors such as vibration and impact.

[0172] Referring to Figure 10, as one possible embodiment of the stress buffer 524, the stress buffer 524 includes a plurality of buffer protrusions that are interconnected. The protrusion directions of the plurality of buffer protrusions may be the same or different, or some buffer protrusions may have the same protrusion direction while the remaining buffer protrusions have different protrusion directions.

[0173] In one example, any two adjacent buffer protrusions protrude in the same direction, making the shape of the stress buffer portion 524 resemble a mountain peak. In another example, any two adjacent buffer protrusions protrude in opposite directions, making the shape of the stress buffer portion 524 wavy. This allows for more effective dispersion of impact force upon impact; the wavy profile disperses the impact force in multiple directions, reducing localized stress concentration and thus lowering the risk of damage to the fuse portion 523 due to impact.

[0174] Furthermore, both the peak-shaped and wave-shaped stress buffer sections 524, through the interconnection of multiple buffer protrusions, enhance the stability and rigidity of the overall structure. This design helps prevent loosening or breakage of connections under vibration and impact environments, improving the reliability of the fuse 520.

[0175] It should be noted that the protrusion direction of the buffer protrusion relative to the fuse portion 523 can be selected in several ways. For example, the protrusion direction of the buffer protrusion is parallel to the thickness direction of the fuse portion 523, as shown in Figure 3. Alternatively, the protrusion direction of the buffer protrusion can be perpendicular to the thickness direction of the fuse portion 523; in other words, the protrusion direction of the buffer protrusion extends along a horizontal plane. These multiple protrusion direction options allow the design to flexibly adapt to different application scenarios and requirements. For example, in applications requiring higher structural strength, a design parallel to the thickness direction of the fuse portion can be chosen; while in applications requiring a more uniform fusing effect, a design extending along a horizontal plane can be selected.

[0176] The structure of the stress buffer portion 524 is not limited to multiple buffer protrusions; other arrangements are also possible. As one possible implementation, a highly elastic material (such as rubber, silicone, or other elastic polymers) can be used to cover at least one surface of the fuse portion 523 to form a stress buffer layer. This material can effectively absorb and disperse vibration energy, reducing the impact on the fuse portion 523.

[0177] As one possible implementation, the fuse portion 523, the first connecting portion 521, and the second connecting portion 522 are all separately provided. That is, the fuse portion 523, the first connecting portion 521, and the second connecting portion 522 are three relatively independent components. In this way, the structure of the fuse portion 523 can be freely configured. For example, the fuse portion 523 is a fuse, and thus the fuse portion 523 itself constitutes a stress buffer.

[0178] In this way, the fusible link 523 effectively absorbs and disperses stress during the fusing process, thereby reducing the impact on surrounding circuits and components. Furthermore, it simplifies the overall structure of the fuse 520 and facilitates its fabrication.

[0179] Referring to Figure 11, in one possible implementation, the fuse portion 523 includes at least two sub-fuse portions 5231 arranged at intervals from each other. Each sub-fuse portion 5231 is used to connect the first connecting portion 521 and the second connecting portion 522.

[0180] In this way, the size of each sub-fuse 5231 can be reduced as much as possible. A smaller fuse size means that under the same current overload conditions, the sub-fuse 5231 can reach the fusing temperature more quickly, thereby breaking the circuit faster and improving the fusing response speed.

[0181] It should be understood that each sub-fuse 5231 can be relatively independent, or they can be connected in parallel and then connected to the first connecting part 521 and the second connecting part 522 respectively.

[0182] For example, as shown in Figure 11, the fuse portion 523 is provided with at least one partition hole 5232, which divides the fuse portion 523 into at least two sub-fusible portions 5231. For example, the fuse portion 523 is provided with one partition hole 5232, and one partition hole 5232 divides the fuse portion 523 into two sub-fusible portions 5231; after one end of the two sub-fusible portions 5231 is connected together, it is connected to the first connecting portion 521, and after the other end of the two sub-fusible portions 5231 is connected together, it is connected to the second connecting portion 522.

[0183] The presence of the separator hole 5232 reduces the cross-sectional area of ​​each sub-fuse 5231, thereby enabling the sub-fuse 5231 to reach the temperature required for fusing more quickly under the same current overload conditions, achieving faster circuit disconnection and enhancing fusing efficiency.

[0184] It should be noted that at least one partition hole 5232 and stress buffer portion 524 can be provided simultaneously in the fuse portion 523, or other options are also possible. For example, the fuse portion 523 can have only stress buffer portion 524, or it can have only at least one partition hole 5232.

[0185] In this embodiment, the number of fuse elements 523 can be one or more. Referring to Figure 11, multiple fuse elements 523 are arranged at circumferential intervals along the first connecting portion 521. By arranging multiple fuse elements 523 at circumferential intervals along the first connecting portion 521, the current can be more effectively dispersed, reducing current concentration on a single fuse element 523 and avoiding the risk of premature melting of a single fuse element 523 due to excessive current. Furthermore, the design of multiple fuse elements 523 provides additional safety redundancy for the battery. Even if one fuse element 523 fails to function properly for some reason, the other fuse elements can still continue to perform the task of current interruption, ensuring that the battery's safety performance is not affected.

[0186] It should be noted that when there are multiple fuses 523, the number of second connecting parts 522 can be selected in various ways. For example, the second connecting part 522 includes at least one, and multiple fuses 523 are connected to the disk body 510 through at least one second connecting part 522. In other words, when there is one second connecting part 522, multiple fuses 523 are connected to the disk body 510 through one second connecting part 522. When there are at least two second connecting parts 522, several fuses 523 are connected to the disk body 510 through one of the second connecting parts 522. The number of fuses 523 can be freely selected according to the actual situation.

[0187] By selecting an appropriate number of second connection portions 522, this embodiment can optimize the current path between the fuse portion 523 and the disk body 510. For example, when multiple second connection portions 522 are used, the current distribution can be more uniform, reducing the current pressure on a single second connection portion 522, thereby improving the reliability and safety of the battery 1000.

[0188] Please refer to Figure 8. In one possible implementation, the disk body 510 is provided with a first through hole 511, and the fuse 520 is provided with a second through hole 525. The first through hole 511 and the second through hole 525 at least partially overlap.

[0189] In other words, the first through hole 511 and the second through hole 525 can partially overlap or completely overlap. This allows the first through hole 511 and the second through hole 525 to communicate with the electrolyte injection hole of the cover plate 400, facilitating the injection of electrolyte into the outer casing 300 through the electrolyte injection hole, the first through hole 511, and the second through hole 525, thereby ensuring the normal operation of the battery 1000.

[0190] The second through hole 525 can be disposed in at least one of the first connecting portion 521 and the second connecting portion 522. For example, the second through hole 525 is disposed in the first connecting portion 521, and the axis of the second through hole 525 coincides with the axis of the first through hole 511. This increases the overlapping area of ​​the first through hole 511 and the second through hole 525, thereby helping to accelerate the flow rate of the electrolyte, improve injection efficiency, and reduce electrolyte waste during the injection process.

[0191] It should be noted that the first through hole 511 and the second through hole 525 can also be used as venting holes in addition to being used as injection holes.

[0192] In one possible implementation, the collector assembly 500 further includes an insulator 530, which is disposed at least between the disk body 510 and the fuse 520.

[0193] Since the fusible link 520 will detach onto the disk 510 when it melts, it can easily come into contact with nearby metal, potentially causing the circuit to reconnect. Therefore, in this embodiment, an insulating member 530 is at least disposed between the disk 510 and the fusible link 520. The insulating member 530 effectively isolates the fusible link 520 from direct contact with the disk 510 or other metal components, preventing the circuit from reconnecting after melting. The insulating member 530 may be made of rubber or other insulating materials.

[0194] It should be noted that the insulating component 530 may not be provided between the disk body 510 and the fuse 520. This is because the contact resistance at the non-electrical connection points between the fuse 520 and the disk body 510 is relatively high, which can also serve a current-limiting function. Therefore, for some applications with lower requirements or strict cost control, a design without the insulating component 530 can still meet the usage requirements. However, when an insulating component 530 is provided between the disk body 510 and the fuse 520, after the fuse 523 melts under high current, the molten metal beads are less likely to re-bond with the disk body 510, thus further reducing the contact resistance. Therefore, it is preferable to provide an insulating component 530 between the disk body 510 and the fuse 520.

[0195] Referring to Figure 8, the insulating member 530 is provided with a third through hole 531, which at least partially coincides with the first through hole 511 and at least partially coincides with the second through hole 525, thereby enabling communication between the first through hole 511 and the second through hole 525. Exemplarily, the axes of the first through hole 511, the second through hole 525, and the third through hole 531 coincide. This helps to accelerate the flow rate of the electrolyte, improve injection efficiency, and reduce electrolyte waste during the injection process.

[0196] The area of ​​the second through hole 525 is greater than or equal to the area of ​​the third through hole 531; and / or, the area of ​​the third through hole 531 is greater than or equal to the area of ​​the first through hole 511. In this way, the first through hole 511 can be fully exposed within the second through hole 525 and the third through hole 531, ensuring that the electrolyte can enter the electrode core in a timely and effective manner through the first through hole 511, reducing electrolyte leakage and waste during the injection process.

[0197] In one possible implementation, the disk body 510 is provided with at least one third connecting portion 512, which is adapted to be connected to the electrode core. The battery cell 1 includes a tab portion 120, and the at least one third connecting portion 512 is used for welding to the tab portion 120.

[0198] The at least one third connecting part 512 may be a part of the disk body 510 or an additional component, and the disk body 510 and the at least one third connecting part 512 are connected by a conventional connection method.

[0199] As an example, the third connecting portion 512 is formed by a part of the disc body 510. For example, a portion of the disc body 510 protrudes in a direction away from the fuse 520 to form at least one third connecting portion 512. That is, at least one third connecting portion 512 is a connecting protrusion. This shortens the distance between at least one third connecting portion 512 and the tab portion 120 of the cell 1, facilitating the connection between the two. Specifically, when the disc body 510 and the tab portion 120 are welded using a welding process, the solder can melt through at least one third connecting portion 512 more quickly, thereby achieving a strong connection between the disc body 510 and the tab portion 120. It should be noted that laser welding is preferred as the welding method in this example.

[0200] It should be noted that when there are multiple third connecting portions 512, the multiple third connecting portions 512 are arranged at intervals. The multiple third connecting portions 512 are arranged at intervals along the circumference of the first through hole 511. For example, the number of third connecting portions 512 is four, and the four third connecting portions 512 are symmetrically arranged with respect to the center of the first through hole 511.

[0201] The arrangement of multiple third connecting parts 512 allows the disc body 510 to adapt to electrode tabs 120 of different sizes and shapes. By selecting appropriate third connecting parts 512 for welding, a tight connection between the electrode tabs 120 and the disc body 510 can be ensured, thereby improving the reliability and stability of the connection.

[0202] It should be noted that the protrusion height of each third connection part 512, or the distance between the surface of each third connection part 512 facing away from the fuse 520 and the surface of the disc 510 facing the fuse 520, can be freely set according to the distance between the disc 510 and the tab of the battery cell 1.

[0203] In this embodiment, each third connecting portion 512 includes a first sub-connecting portion 5121 and a second sub-connecting portion 5122 that are interconnected. The extending direction of the first sub-connecting portion 5121 intersects the extending direction of the second sub-connecting portion 5122. For example, the extending direction of the first sub-connecting portion 5121 is perpendicular to the extending direction of the second sub-connecting portion 5122, and the first sub-connecting portion 5121 and the second sub-connecting portion 5122 are connected by an arc transition.

[0204] This application also provides a battery device, which includes the battery 1000 described in any of the above embodiments. In this embodiment, the battery device may contain one or more batteries 1000.

[0205] The battery device may also include a circuit structure connected to the battery 1000 for power output from the battery 1000 or for protection of the battery 1000.

[0206] This application also provides an electrical device, including an electrical device and a battery cell 1 as described in any of the above embodiments. The battery cell 1 is connected to the electrical device to provide electrical energy to the electrical device. Alternatively, it includes an electrical device and a battery 1000 as described in any of the above embodiments, with the battery 1000 connected to the electrical device to provide electrical energy to the electrical device. Alternatively, the electrical device includes an electrical device and a battery device as described in any of the above embodiments, with the battery device connected to the electrical device to provide electrical energy to the electrical device. Alternatively, the electrical device includes an electrical device and a battery cell as described in any of the above embodiments, with the battery cell connected to the electrical device to provide electrical energy to the electrical device. In this application embodiment, the electrical device can be a vehicle, which can be a new energy vehicle, such as a pure electric vehicle (PEV / Battery Electric Vehicle, abbreviated as BEV), a range-extended electric vehicle (REEV), a hybrid electric vehicle (HEV), or a fuel cell electric vehicle. The vehicle can also be any vehicle with a battery. The electrical device can also be an energy storage station.

[0207] It is understood that, in the electrical equipment of this embodiment, by using a battery or battery cell 1 or battery device having the cell electrode 10 of any of the above embodiments, higher electrical safety can be achieved while effectively reducing manufacturing costs.

[0208] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0209] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0210] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A battery (1000), wherein, Includes a battery cell (1), said battery cell (1) comprising: Diaphragm (20); A first electrode (10-1) is disposed on one side of the diaphragm (20); and The second electrode (10-2) is disposed on the side of the diaphragm (20) facing away from the first electrode (10-1).

2. The battery according to claim 1, wherein, The battery cell includes a battery cell electrode (10), the battery cell electrode (10) comprising: an electrode body including a plurality of individual electrode sheets (100) arranged along a first direction, and having a cut portion (511) extending along a second direction between adjacent individual electrode sheets (100), wherein the first direction intersects the second direction; and A connector (200) is connected to two adjacent single electrode sheets (100) on both sides of the cutting portion (511); the electrode body expands to disconnect the two adjacent single electrode sheets (100) from the cutting portion (511).

3. The battery (1000) according to claim 2, wherein, Each of the said individual electrode sheets (100) includes an electrode sheet portion (510) and at least one electrode tab portion (520), the electrode tab portion (520) being connected to at least one side of the electrode sheet portion (510), and the electrode tab portion (520) being located outside the cut portion (511); At least some of the adjacent two electrode portions (510) are separated by the cutting portion (511).

4. The battery (1000) according to claim 3, wherein, The dimension of the cutting portion (511) in the second direction is not greater than the dimension of the electrode portion (510) in the second direction.

5. The battery (1000) according to claim 3 or 4, wherein, The electrode portion (510) includes a current collector (512) and an active material layer (113). The active material layer (113) is disposed on at least one side surface of the current collector (512), and the current collectors (512) of two adjacent electrode portions (510) are spaced apart to form the cut portion (511).

6. The battery (1000) according to claim 5, wherein, The connector (200) is connected to the active material layer (113).

7. The battery (1000) according to claim 6, wherein, In the second direction, the size of the cutting portion (511) is H1, the size of the active material layer (113) is H2, the size of the current collector (512) is H3, and the size of the connector (200) is H4, and they satisfy the following relationship: 1 / 3H3≤H1≤H3; And / or 1 / 3H3≤H4≤H3; And / or H2≤H3.

8. The battery (1000) according to any one of claims 5-7, wherein, At least a portion of the orthographic projection of the connector (200) toward the electrode portion (510) is located outside the active material layer (113).

9. The battery (1000) according to claim 8, wherein, The edge of the connector (200) projecting toward the electrode portion (510) in the second direction is located between the edge of the active material layer (113) and the edge of the current collector (512).

10. The battery (1000) according to claim 8 or 9, wherein, The edge of the connector (200) on the side near the tab (520) is located inside the current collector (512); the edge of the connector (200) on the side away from the tab (520) is at least partially located outside the electrode portion (510).

11. The battery (1000) according to claim 10, wherein, On the side of the connector (200) away from the tab (520), the distance between the edge of the connector (200) and the edge of the single electrode (100) is W2, and W2 < 5 mm.

12. The battery (1000) according to any one of claims 2-7, wherein, In the first direction, the size of the cutting portion (511) is K1, and 0 <K1<200mm; And / or the distance between the edge of the connector (200) and the edge of the cut portion (511) inside the connector (200) is K2, and 1 mm. <K2<20mm。 13. The battery (1000) according to any one of claims 2-12, wherein, The connector (200) is an adhesive layer, which has an adhesive surface and a non-adhesive surface, with the adhesive surface facing the single electrode (100).

14. The battery (1000) according to any one of claims 2-13, wherein, The cutting section (511) is constructed in any of the following shapes: straight, serrated, wavy, or curved.

15. The battery (1000) according to any one of claims 2-14, wherein, Along the first direction, the length of the plurality of individual electrode sheets (100) gradually decreases.

16. The battery (1000) according to claim 15, wherein, The length of the cell electrode (10) is L, and the length of the nth cell electrode (100) is Ln, and the following relationship is satisfied: 3%L≤L1≤50%L.

17. The battery (1000) according to claim 16, wherein, Along the first direction, the dimensions of the plurality of individual electrode sheets (100) are L1, L2, ..., Ln, respectively, and satisfy the following relationship: 0≤Ln-1-Ln≤1 / 2Ln-1, where n is an integer and 2≤n.

18. The battery (1000) according to any one of claims 2-17, wherein, Along the first direction, the lengths of the plurality of individual electrode sheets (100) are equal.

19. The battery (1000) according to any one of claims 2-18, wherein, The diaphragm (20), the first electrode (10-1) and the second electrode (10-2) are wound to form the battery cell (1). In the extending direction of the battery cell electrode (10), the size of the single electrode (100) located inside the battery cell (1) is not less than the size of the single electrode (100) located outside the battery cell (1).

20. The battery (1000) according to claim 1, wherein, The battery (1000) includes a current collector assembly (500) adapted to be connected to the battery cell (1) and includes: A disk body (510) adapted to be electrically connected to a battery cell (1); A fuse (520) is connected to the disc body (510), wherein the fuse (520) includes a first connecting portion (521) adapted to be connected to the cover plate (400) of the battery (1000); In the thickness direction of the disk body, at least a portion of the orthographic projection of the first connecting portion (521) overlaps with the orthographic projection of the disk body (510).

21. The battery (1000) according to claim 20, wherein, In the thickness direction of the disk body (510), the orthographic projection of the first connecting portion (521) is located within the orthographic projection of the disk body (510).

22. The battery (1000) according to claim 21, wherein, The center of the first connecting part (521) coincides with the center of the disk body (510).

23. The battery (1000) according to any one of claims 20-22, wherein, The fuse (520) further includes a second connecting part (522) and a fuse part (523), wherein the second connecting part (522) is connected to the disc body (510); One end of the fusible part (523) is connected to the second connecting part (522), and the other end of the fusible part (523) is connected to the first connecting part (521).

24. The battery (1000) according to claim 23, wherein, The flow area of ​​the second connecting part (522) is greater than the flow area of ​​the fuse part (523).

25. The battery (1000) according to claim 23 or 24, wherein, The longitudinal section is a section perpendicular to the disk body (510); the longitudinal section area of ​​the fuse part (523) is smaller than the longitudinal section area of ​​the second connecting part (522); And / or, the longitudinal cross-sectional area of ​​the fuse portion (523) is smaller than the longitudinal cross-sectional area of ​​the first connecting portion (521).

26. The battery (1000) according to any one of claims 23-25, wherein, The fuse element (520) further includes a stress buffer (524), which is disposed on the fuse element (523).

27. The battery (1000) according to claim 26, wherein, The stress buffer (524) includes a plurality of interconnected buffer protrusions.

28. The battery (1000) according to claim 27, wherein, The protrusion directions of any two adjacent buffer protrusions are opposite.

29. The battery (1000) according to claim 28, wherein, The protrusion direction of the buffer protrusion is parallel to the thickness direction of the fused portion (523); or, the protrusion direction of the buffer protrusion is perpendicular to the thickness direction of the fused portion (523).

30. The battery (1000) according to claim 26, wherein, The stress buffer portion includes a stress buffer layer that covers the fusible portion (523).

31. The battery (1000) according to any one of claims 23-30, wherein, The fusible part (523) is separate from the first connecting part (521) and the second connecting part (522), and the fusible part (523) is a fuse.

32. The battery (1000) according to claim 25 or 28, wherein, The fuse section (523) includes at least two sub-fusible sections (5231) arranged at intervals from each other; Each of the sub-fuse portions (5231) is used to connect the first connecting portion (521) and the second connecting portion (522).

33. The battery (1000) according to claim 32, wherein, The fuse portion (523) is provided with at least one partition hole (5232), and the at least one partition hole (5232) divides the fuse portion (523) into at least two sub-fusible portions (5231).

34. The battery (1000) according to claim 32, wherein, The fusible part (523) includes a plurality of fusible parts (523), which are arranged at intervals along the circumference of the first connecting part (521).

35. The battery (1000) according to claim 34, wherein, The second connecting part (522) includes at least one, and the plurality of the fuse parts (523) are connected to the disk body (510) through at least one of the second connecting parts (522).

36. The battery (1000) according to any one of claims 20-35, wherein, The disc body (510) is provided with a first through hole (511), and the fuse (520) is provided with a second through hole (525). The first through hole (511) and the second through hole (525) at least partially overlap.

37. The battery (1000) according to claim 36, wherein, The second through hole (525) is disposed on the first connecting part (521), and the axis of the second through hole (525) coincides with the axis of the first through hole (511).

38. The battery (1000) according to claim 37, wherein, The collector assembly also includes an insulating element (530), which is at least partially disposed between the disk body (510) and the fuse element (520).

39. The battery (1000) according to claim 38, wherein, The insulating member (530) is provided with a third through hole (531), which at least partially overlaps with the first through hole (511) and at least partially overlaps with the second through hole (525) so that the first through hole (511) and the second through hole (525) are connected.

40. The battery (1000) according to claim 39, wherein, The axes of the first through hole (511), the second through hole (525), and the third through hole (531) coincide.

41. The battery (1000) according to claim 40, wherein, The area of ​​the second through hole (525) is greater than or equal to the area of ​​the third through hole (531); And / or, the area of ​​the third through hole (531) is greater than or equal to the area of ​​the first through hole (511).

42. The battery (1000) according to any one of claims 20-41, wherein, The disk body (510) is provided with at least one third connection part (512), and at least one of the third connection parts (512) is adapted to be connected to the battery cell (1).

43. The battery (1000) according to any one of claims 20-42, wherein, The fuse (520) and the disk (510) are separately disposed.

44. The battery (1000) according to any one of claims 20-43, wherein, The battery (1000) is a cylindrical battery.

45. The battery (1000) according to claim 44, wherein, The battery (1000) also includes: A housing (300) having an opening forming a receiving cavity (310) therein; the battery cell (1) is disposed in the receiving cavity (310); A cover plate (400) is connected to the outer casing (300) and seals the opening; The collector assembly (500) is disposed between the battery cell (1) and the cover plate (400), and is connected to the battery cell (1) and the cover plate (400) respectively.

46. ​​A battery device, wherein, Includes the battery (1000) as described in any one of claims 1-45.

47. An electrical appliance, wherein, It includes an electrical device and a battery (1000) as described in any one of claims 1-45, wherein the battery (1000) is connected to the electrical device and is used to provide electrical energy to the electrical device; Alternatively, it may include an electrical device and the battery device of claim 46, wherein the battery device is connected to the electrical device for providing electrical energy to the electrical device.

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