One-cell battery, battery, and electric device

Abstract

To provide a battery which prevents a free end of a tab from contacting with an inner wall of a housing to achieve improvement of safe performance.SOLUTION: A one-cell battery 100 includes a housing 110, a first cover plate 150, a first terminal 160, an electrode assembly 120, and a first insulation member. The housing has a first opening 111. The first cover plate seals a first opening and is attached to the first opening. The electrode assembly is disposed in the housing and has a first tab 121 extending from the side close to the first cover plate. A first tab is fixedly connected to the first terminal and is formed having a first tab free end 1211. The first insulation member is attached to the side, which is close to the electrode assembly, of the first cover plate. A tab block structure 170 is provided at the first insulation member. The side, which is close to the electrode assembly, of the first terminal and the tab block structure form a first storage space 190.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the technical field of batteries, and in particular to a single battery, a battery, and an electric device. [Background technology]

[0002] In currently available batteries, in order to solve the problem of contact between the tabs inside the housing and the inner wall of the housing, an insulating member and an insulating bracket are mostly provided between the cover plate and the electrode assembly. However, there exists a butt gap between the currently available insulating member and the insulating bracket, and there is a risk that the extra tabs inside the housing will protrude from the joint between the insulating member and the insulating bracket and contact the inner wall of the housing, thus compromising the safety of the battery. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of the above-mentioned shortcomings of the related art, the present invention provides a unitary battery, a battery, and an electric device that improves on a technical problem present in currently available unitary batteries in that the free end of the tab is prone to contact the inner wall of the housing, leading to a short circuit. [Means for solving the problem]

[0004] In order to achieve the above and other related objectives, the present invention provides a single battery including a housing, a first cover plate, a first terminal, an electrode assembly, and a first insulating member. The housing has a first opening. The first cover plate is attached to the first opening to seal the first opening. The first terminal is attached to the first cover plate. The electrode assembly is disposed within the housing and has a first tab extending from a side proximal to the first cover plate. The first tab is fixedly connected to the first terminal and is formed with a first tab free end. The first insulating member is attached to a side of the first cover plate proximal to the electrode assembly. The first insulating member is provided with a tab block structure. The side of the first terminal proximal to the electrode assembly and the tab block structure form a first accommodation space. The first accommodation space is used to limit the range of movement of the first tab free end, and the housing is located outside the first accommodation space.

[0005] In the single battery according to one embodiment of the present invention, the tab block structure is disposed on the front side in the extension direction of the first tab free end.

[0006] In a single battery according to one embodiment of the present invention, the first tab includes a plurality of stacked first tab pieces, and the free ends of the first tab pieces have a ragged end structure.

[0007] In a single battery according to one embodiment of the present invention, the first insulating member includes a first insulating body and a first insulating bracket disposed between the first insulating body and the electrode assembly, and the tab block structure is provided on the first insulating body and / or the first insulating bracket and configured to block the first tab free end from passing through a gap between the first insulating body and the first insulating bracket.

[0008] In one embodiment of the present invention, the tab block structure includes a butt seam bend disposed at the butt position of the first insulating body and the first insulating bracket.

[0009] In the single battery according to one embodiment of the present invention, in the thickness direction of the first cover plate, the butt seam of the butt seam bend portion bends away from the contact surface between the first tab and the first terminal.

[0010] In a single battery according to one embodiment of the present invention, the butt seam curve is located outside the movable area of ​​the first tab free end.

[0011] In a single cell according to one embodiment of the invention, the butt seam turn comprises a non-linear stretched butt structure.

[0012] In a single cell according to one embodiment of the present invention, the non-linear stretch butt seam structure includes one or a combination of a sawtooth butt, a wave butt, and a triangular butt.

[0013] In one embodiment of the single battery of the present invention, a part or the whole of the butt joint between the first insulating body and the first insulating bracket opposite the first tab free end is located outside the movable area of ​​the first tab free end.

[0014] In the single battery according to one embodiment of the present invention, the tab blocking structure includes an extension part, the root part of which is connected to the first insulating body and / or the first insulating bracket and extends to block the front side in the extension direction of the first tab free end.

[0015] In one embodiment of the single battery of the present invention, the extended end of the extension portion extends beyond the working area of ​​the first tab free end.

[0016] In the single battery according to one embodiment of the present invention, a recess is provided in the first insulating bracket or the first insulating body at the front side in the extension direction of the extension part, and the extension end extends at least partially into the recess.

[0017] In one embodiment of the single battery of the present invention, in the extension direction of the first tab free end, the recess penetrates the corresponding wall of the first insulating body or the corresponding wall of the first insulating bracket. The extension and the recess are butted to form a butt seam bend. In the thickness direction of the first cover plate, the butt seam of the butt seam bend is bent away from the contact surface between the first tab and the first terminal.

[0018] In the single battery according to one embodiment of the present invention, the extension and / or the recess are provided with a plug-in guide structure for guiding the two to butt together.

[0019] In the single battery according to one embodiment of the present invention, the plug-in guiding structure includes one or a combination of rounded corners and inclined surfaces.

[0020] In the single battery according to one embodiment of the present invention, the ratio of the minimum width W1 of the extension portion to the maximum width W2 of the first tab is 0.5-1.

[0021] In a single battery according to one embodiment of the present invention, the first tab includes a plurality of stacked first tab pieces, and in the thickness direction of the first cover plate, the ratio of the height H1 of the extension portion to the stacked thickness H2 of the plurality of stacked first tab pieces is 2.68 to 3.68.

[0022] In one embodiment of the single battery of the present invention, the extension extends in a plane, and in a direction perpendicular to the extension, an orthogonal projection of the extension covers an orthogonal projection of the first tab free end.

[0023] In the single battery according to one embodiment of the present invention, the extension portion is provided with a draft angle that makes it easy to remove from the mold, and the draft angle is in the range of 1° to 10°.

[0024] In one embodiment of the present invention, the extension is disposed on the first insulating body, and the thickness of the extension is not less than 0.7 mm and is less than the thickness from the edge of the groove to the outer wall of the first insulating body.

[0025] In a single battery according to one embodiment of the present invention, the first terminal includes a bottom plate disposed on a side of the first cover plate closer to the electrode assembly and welded to the first tab.

[0026] In one embodiment of the present invention, the single battery is a prismatic battery. The first tab free end is close to the large surface of the housing. In a direction perpendicular to the large surface, the orthogonal projection of the extension portion covers the orthogonal projection of the first tab free end.

[0027] In one embodiment of the single battery of the present invention, the first insulating bracket is provided with a first tab receiving groove, and in a direction perpendicular to the large surface, the orthogonal projection of the first tab receiving groove covers the orthogonal projection of the extension portion.

[0028] In a single battery according to one embodiment of the invention, the first tab is a positive electrode tab.

[0029] In the single battery according to one embodiment of the present invention, the connection between the root portion of the extension portion and the first insulating body or the first insulating bracket includes one or a combination of an integral connection, an adhesive, a removable snap connection, a bendable connection, and a rotatable connection.

[0030] In the single battery according to one embodiment of the present invention, the root portion of the extension portion is connected to the first insulating body or the first insulating bracket so as to be capable of bending or rotating.

[0031] In the single battery according to one embodiment of the present invention, the first insulating bracket includes a collecting tab structure for collecting the first tabs.

[0032] In one embodiment of the present invention, the tab collection structure includes a first protrusion opposite the extension, the first protrusion being connected to the first insulating bracket and protruding toward one side of the extension, and a first tab receiving groove formed on a side of the first protrusion closer to the first cover plate.

[0033] In the single battery according to one embodiment of the present invention, the tab collection structure further includes a second protrusion disposed on the opposite side to the first protrusion, the second protrusion being connected to the first insulating bracket and protruding toward one side of the first protrusion to support the first tab free end.

[0034] In a single battery according to one embodiment of the present invention, the housing further includes a second opening, and the second opening and the first opening are disposed on two opposing sides of the housing. The single battery further includes a second cover plate attached to the second opening and sealing the second opening. The electrode assembly has a second tab extending from a side closer to the second cover plate. The second tab is conductively connected to the housing, the second cover plate, or a terminal on the second cover plate.

[0035] The present invention further provides a battery, the battery comprising a single cell according to any one of the above.

[0036] The present invention further provides an electrical device, the electrical device comprising a single battery according to any one of the above. Effect of the Invention

[0037] In the single battery provided by the present invention, the first insulating member is provided with a tab block structure. The side of the first terminal close to the electrode assembly and the tab block structure form a first accommodating space. The first accommodating space is used to limit the working area of ​​the free end of the first tab, and the housing is located outside the first accommodating space. The tab block structure prevents the first tab from contacting the housing. The tab block structure blocks the excess first tab, and there is no need to cut the tab. In this way, the production cost is reduced and the safety performance of the battery is improved.

[0038] The battery and electrical device of the present invention include the unitary battery of the present invention, thereby providing improved safety performance and reducing manufacturing costs. [Brief description of the drawings]

[0039] In order to more clearly present the technical solutions provided in the embodiments of the present invention or related technologies, some accompanying drawings required by the embodiments or related technologies are briefly introduced below for explanation. It is obvious that the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative efforts.

[0040] [Figure 1] FIG. 2 is a cross-sectional view of one side of a first cover plate in a single cell according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram of a single battery after welding of a first tab and a first terminal has been completed according to one embodiment of the present invention. [Diagram 3] FIG. 2 is an exploded view of a first cover plate, a first insulating body, and a first insulating bracket in a single battery according to one embodiment of the present invention. [Figure 4] FIG. 2 is a side view of a first cover plate, a first insulating body, and a first insulating bracket in a single battery according to one embodiment of the present invention after assembly. [Diagram 5] FIG. 2 is a three-dimensional view of a first insulating body in a single battery according to one embodiment of the present invention. [Figure 6] FIG. 2 is a top view of a first insulating body in a single battery according to one embodiment of the present invention. [Figure 7] FIG. 2 is a top view of a first insulating bracket in a single battery according to one embodiment of the present invention. [Figure 8] FIG. 2 is a three-dimensional view of a first insulating bracket in a single battery according to one embodiment of the present invention. [Figure 9] FIG. 2 is a cross-sectional view of one side of a first cover plate in a single cell according to one embodiment of the present invention. [Figure 10] FIG. 13 is a schematic diagram of a single battery according to another embodiment of the present invention after welding of a first tab and a first terminal is completed. [Figure 11] FIG. 11 is an exploded view of a first cover plate, a first insulating body, and a first insulating bracket in a single battery according to another embodiment of the present invention. [Figure 12]FIG. 13 is a side view of an assembled first cover plate, a first insulating body, and a first insulating bracket in a single battery according to another embodiment of the present invention. [Figure 13] FIG. 2 is a three-dimensional view of a first insulating body in a single battery according to another embodiment of the present invention. [Figure 14] FIG. 2 is a top view of a first insulating body in a single battery according to another embodiment of the present invention. [Figure 15] FIG. 13 is a three-dimensional view of a first insulating bracket in a single battery according to another embodiment of the present invention. [Figure 16] FIG. 13 is a top view of a first insulating bracket in a single battery according to another embodiment of the present invention. [Figure 17] FIG. 4 is a cross-sectional view of one side of a first cover plate in a single battery according to another embodiment of the present invention. [Figure 18] FIG. 11 is a three-dimensional view of a first insulating body in a single battery according to yet another embodiment of the present invention. [Figure 19] FIG. 13 is a three-dimensional view of a first cover plate assembly when a first insulating body is in a first state in a single battery according to yet another embodiment of the present invention. [Figure 20] FIG. 13 is a three-dimensional view of a first cover plate assembly when a first insulating body in a single battery according to yet another embodiment of the present invention is in a second state. [Figure 21] FIG. 13 is a three-dimensional view of a first cover plate assembly when a first insulating body is in a first state in a single battery according to yet another embodiment of the present invention. [Figure 22] FIG. 4 is a cross-sectional view of one side of a first cover plate in a single battery according to yet another embodiment of the present invention. [Figure 23] FIG. 4 is a cross-sectional view of one side of a first cover plate in a single battery according to yet another embodiment of the present invention. [Figure 24] FIG. 11 is a three-dimensional view of a first insulating body in a single battery according to yet another embodiment of the present invention. [Diagram 25] FIG. 11 is a three-dimensional view of a first insulating body in a single battery according to yet another embodiment of the present invention. [Figure 26] FIG. 4 is a cross-sectional view of one side of a first cover plate in a single battery according to yet another embodiment of the present invention. [Figure 27] FIG. 4 is a cross-sectional view of one side of a first cover plate in a single battery according to yet another embodiment of the present invention. [Figure 28] FIG. 2 is a structural diagram of a first tab free end in a single battery according to one embodiment of the present invention. [Figure 29] FIG. 1 is a structural diagram of a battery according to one embodiment of the present invention. [Diagram 30] 1 is a structural diagram of an electrical device according to one embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] The implementation of the present invention is illustrated below by specific embodiments. Those skilled in the art will easily understand other advantages and effects of the present invention from the contents disclosed herein. The present invention can also be implemented or applied by other different specific implementation methods. The details in this specification can also be modified or changed based on different perspectives and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other if not inconsistent. It should be understood that the terms used in the embodiments of the present invention are intended to describe specific embodiments, but are not intended to limit the scope of protection of the present invention. In the following embodiments, the test methods without specific conditions are usually based on conventional conditions or conditions recommended by each manufacturer.

[0042] When a numerical range is given in the embodiment, it should be understood that any numerical value between the two end points and the two end points of each numerical range may be selected unless otherwise specified in the embodiment. Unless otherwise defined, all technical and scientific terms used in the present invention are consistent with the understanding of the prior art by those skilled in the art and the content of the present invention. Any method, device, and material of the prior art similar or equivalent to the method, device, and material described in the embodiment of the present invention can also be used to implement the present invention.

[0043] Please note that the terms "upper", "lower", "left", "right", "middle", "one side" and the like used in this specification are for convenience of explanation only and are not used to limit the scope of the present invention. Any change or adjustment of the relative relationship is within the scope of the present invention without substantially changing the technical content.

[0044] In currently available single batteries, the contact between the tab and the housing leads to short circuit and causes many problems. After research, designers found that the tab of the electrode assembly in currently available single batteries is mostly extended outside the bare cell and connected to the terminal on the cover. Especially in prismatic batteries, the tab includes multiple tab pieces, which are stacked, bent, and welded to the terminal on the cover plate. After welding, the excess free ends of the multiple tab pieces spread out to form an irregular end structure, which is easy to contact the housing from the seam between the insulating member and the insulating bracket. In order to prevent the free ends of the excess tab pieces from contacting the housing when the cover plate closes the housing, an insulating member and an insulating bracket are mostly provided between the cover plate and the electrode assembly. However, there is a butt seam between the currently available insulating member and the insulating bracket, and after the cover plate is welded to the housing, there is a risk that the free ends of the excess tab pieces inside the housing will protrude from the seam between the insulating member and the insulating bracket and contact the inner wall of the housing. The amount of redundant tab pieces can be reduced by cutting the tabs, which can further reduce the risk of contact between the tab pieces and the housing. However, cutting the tabs increases the number of processes and reduces the assembly efficiency, and chips are generated during the cutting process, and if the chips enter the inside of the housing, they may penetrate the separator of the electrode assembly, thus causing an internal short circuit in the battery, which reduces the safety of the battery.

[0045] Based on the above, and referring to Figs. 1 to 27, the present invention first provides a single battery 100. The first insulating member 20 is provided with a tab block structure 170. The electrode assembly of the first terminal 160 120The side close to the housing 110 and the tab block structure 170 form a first receiving space 190, which is used to limit the movement range of the first tab free end 1211. The housing 110 is located outside the first receiving space 190. The tab block structure 170 can prevent the first tab 121 from contacting the housing 110. The tab block structure 170 can block the excess first tab 121, and there is no need to cut off the tab. In this way, the production cost can be reduced, the safety performance of the battery can be improved, and the technical problem found in currently available single battery that the tab free end is easily contacted with the inner wall of the housing, leading to a short circuit, can be improved.

[0046] The single battery 100 of the present invention may be a power battery or an energy storage battery. Referring to FIG. 1, the single battery 100 includes a housing 110, a first cover plate 150, a first terminal 160, an electrode assembly 120, a first insulating body 140, and a first insulating bracket 130.

[0047] Referring to FIG. 1, a receiving cavity is formed in the housing 110, and one end of the receiving cavity has a first opening 111. The receiving cavity is used to receive the electrode assembly 120, an electrolyte (not shown), and other components, and the first opening 111 is used to assemble the electrode assembly 120 into the receiving cavity. In the present invention, the housing 110 may have an opening only at one end of the receiving cavity, or an opening may be provided at the opposite end of the receiving cavity. The housing 110 may have various shapes, such as a substantially rectangular parallelepiped shape, a substantially cylindrical shape, a substantially prismatic shape, etc. The housing 110 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. In order to prevent the housing 110 from rusting during long-term use, the surface of the housing 110 may be coated with a layer of anti-rust material, such as metallic nickel.

[0048] 1, the first cover plate 150 is attached to seal the first opening 111. The shape of the first cover plate 150 may be circular, rectangular, or any other suitable shape, so long as the first cover plate 150 can be fixedly attached to the housing 110 and seal the first opening 111. Specifically, in consideration of the overall volume, it is preferable that the shape of the first cover plate 150 is similar to the shape of the first opening 111. In this embodiment, the single battery 100 is a rectangular battery. At the pond Ignoring the rounded corners, the housing 110 has an approximately rectangular parallelepiped shape as a whole, and an approximately rectangular parallelepiped accommodating cavity is enclosed within the housing 110. One end of the accommodating cavity has an approximately rectangular opening 111. The shape of the first cover plate 150 is similar to the shape of the first opening 111, and the first cover plate 150 has a first positioning structure 151 that matches the inner wall and end wall of the first opening 111. The first positioning structure 151 may be any suitable structure that can be aligned and positioned with the first opening 111. In this embodiment, the first positioning structure 151 includes a boss that protrudes into the first opening 111 and abuts against the inner wall of the first opening 111. The first positioning structure 151 allows the first cover plate 150 to be quickly positioned and attached to the first opening 111, and can exhibit good stability during further welding or sealing and joining processes between the first cover plate 150 and the housing 110. Of course, those skilled in the art will understand that the above-mentioned first positioning structure 151 does not have to be provided.

[0049] The electrode assembly 120 is a component where the electrochemical reaction occurs in the cell. One or more electrode assemblies 120 may be included in the housing 110. The electrode assembly 120 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector includes a positive electrode coated area and a positive electrode tab connected to the positive electrode coated area. The positive electrode coated area is coated with the positive electrode active material layer, and the positive electrode tab is not coated with the positive electrode active material layer. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector includes a negative electrode coated area and a negative electrode tab connected to the negative electrode coated area. The negative electrode covering area is covered with the negative electrode active material layer, and the negative electrode tab is not covered with the negative electrode active material layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum. The positive electrode active material includes a positive electrode active material, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganate. The material of the negative electrode current collector can be copper. The negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon. The material of the separator can be polypropylene (PP) or polyethylene (PE), etc. To protect and insulate the cell, the cell can be externally covered with an insulating film, and the insulating film can be made of PP, PE, PET, PVC, or other polymer materials.

[0050] Referring to FIG. 1, the electrode assembly 120 is accommodated in the housing 110 and has a first tab 121 extending from a side close to the first cover plate 150. The first tab 121 is fixedly and conductively connected to the first terminal 160, and one end of the first tab 121 outside the connection portion forms a first tab free end 1211. The first tab 121 may be the above-mentioned positive electrode tab or the above-mentioned negative electrode tab, and is not particularly limited here. In this embodiment, the first tab 121 is a positive electrode tab. The first terminal 160 is fixedly attached to the first cover plate 150 and insulated from the first cover plate 150. One end of the first terminal 160 remote from the electrode assembly 120 is exposed to the outside of the first cover plate 150 and is used to form an externally connected electrode. One end of the first terminal 160 close to the electrode assembly 120 is electrically connected to the first tab 121 through the first cover plate 150. The conductive connection method includes, but is not limited to, conductive welding, conductive bonding, etc. Specifically, in the single battery 100 provided in this embodiment, the first terminal 160 includes a bottom plate 161, which is disposed on a side of the first cover plate 150 closer to the electrode assembly 120 and is welded to the first tab 121.

[0051] 1 and 3, the first insulating member 20 is an electrode assembly of the first cover plate 150. 120 The electrode assembly of the first terminal 160 is provided with a tab block structure 170. 120 The side near the housing 110 and the tab block structure 170 form an accommodation space 190 which is used to limit the movement range of the first tab free end 1211. The housing 110 is located outside the first accommodation space 190. In this arrangement, the first accommodation space 190 is separated from the housing 110 by the tab block structure 170, and the first tab 121 is prevented from contacting the housing 110. The tab block structure 170 can block the excess first tab 121, and there is no need to cut the tab. In this way, the production cost is reduced and the electric power consumption is reduced. Pond Improved safety performance.

[0052] Referring to FIG. 1 and FIG. 3, in a single battery according to one embodiment of the present invention, First insulating member20 includes a first insulating body 140 and a first insulating bracket 130. The first insulating bracket 130 is disposed between the first insulating body 140 and the electrode assembly 120. The tab block structure 170 is disposed on the first insulating body and / or the first insulating bracket, and is located on the front side in the extension direction of the first tab free end 1211. The tab block structure 170 blocks the first tab free end 1211 from passing through the gap between the first insulating body 140 and the first insulating bracket 130.

[0053] With reference to Figs. 1 to 6, First insulation body 140 is disposed on the side of the first cover plate 150 close to the electrode assembly 120. The structure and mounting method of the first insulating body 140 are not limited. For example, the structure and mounting method of the lower plastic of the currently available single battery 100 may be referred to, but are not limited to, the structure and mounting method of the lower plastic of the single battery 100. In this embodiment, the first terminal 160 penetrates the first cover plate 150 and the first insulating body 140. The first insulating body 140 is press-fitted into the side of the first cover plate 150 close to the electrode assembly 120 through the bottom plate 161 above the first terminal 160. The first insulating body 140 may be made of any suitable insulating material, including, but not limited to, rubber and plastic.

[0054] 1 to 3 and 7 to 8, the first insulating bracket 130 is disposed inside the housing 110 between the first insulating body 140 and the electrode assembly 120 to support the electrode assembly 120. The first insulating bracket 130 specifically includes a first tab through-hole 133 corresponding to the position of the first tab 121. The first tab 121 extends through the first tab through-hole 133 and is conductively welded to the bottom plate 161 of the first terminal 160. The material of the first insulating bracket 130 includes, but is not limited to, rubber and plastic.

[0055] 1 to 9, in the single battery 100 of the present invention, the first insulating body 140 and / or the first insulating bracket 130 is provided with a tab block structure 170 that is disposed on the front side in the extension direction of the first tab free end 1211 (i.e., the opposite direction to the Y direction in FIG. 1) and is configured to block the first tab free end 1211 from passing through the joint between the first insulating body 140 and the first insulating bracket 130. It should be noted that the tab block structure 170 may be provided on only one of the first insulating body 140 or the first insulating bracket 130, or may be provided on both the first insulating body 140 and the first insulating bracket 130 so that both of them block the first tab free end 1211. The tab block structure 170 may be any suitable structure that can block the first tab free end 1211 to prevent the first tab free end 1211 from passing through the joint between the first insulating body 140 and the first insulating bracket 130. For example, as shown in FIG. 17, FIG. 22, and FIG. 23, an overlapping area is formed on the first insulating body 140 and the first insulating bracket 130 at the front side in the extending direction of the first tab free end 1211 to cover or seal the joint between the first insulating body 140 and the first insulating bracket 130. As another example, as shown in FIG. 4 and FIG. 12, a butt joint curved portion 173 or the like is provided at the butt joint position between the first insulating body 140 and the first insulating bracket 130 at the front side in the extending direction of the first tab free end 1211, but is not limited thereto. The tab blocking structure 170 prevents the first tab free end 1211 from passing through the joint between the first insulating body 140 and the first insulating bracket 130, and prevents the first tab 121 from contacting the housing 110. The extension portion 171 can block the excess first tab piece, and there is no need to perform tab cutting. In this way, the production cost is reduced and the safety performance of the battery is improved.

[0056] 2, 4, and 12, in the single battery 100 according to one embodiment of the present invention, the blocking structure includes a butt joint curved portion 173 provided at the butt joint position between the first insulating body 140 and the first insulating bracket 130. Considering that the end structure of the first tab free end 1211 extends along a straight line in the width direction of the first tab 121 (i.e., the Z direction in FIG. 2) in most cases, a person skilled in the art will understand that the butt joint curved portion 173 is formed by curving the front butt joint in the extension direction of the first tab free end 1211 within the width direction corresponding to the first tab free end 1211. That is, compared with the original flat butt joint structure, it can produce the effect of blocking the protrusion of the first tab free end 1211.

[0057] 1 and 4, in the single battery 100 according to one embodiment of the present invention, in the thickness direction of the first cover plate 150 (i.e., the X direction in FIG. 1), the butt seam of the butt seam curved portion 173 curves away from the contact surface 180 between the first tab 121 and the first terminal 160. As long as the butt seam can be further away from the contact surface 180 between the first tab 121 and the first terminal 160 than the original butt seam, the shape of the butt seam curved portion 173 is not particularly limited. For example, as shown in FIG. 9 and FIG. 12, the butt seam curves toward the first cover plate 150. Alternatively, as shown in FIG. 1 and FIG. 4, the butt seam curves away from the first cover plate 150. The butt seam may be curved in an arc shape, a sawtooth shape, or a generally trapezoid shape, but is not limited thereto.

[0058] As long as the butt seam is curved in the corresponding region on the front side in the extension direction of the first tab free end 1211, the curved butt seam can prevent the first tab free end 1211 from penetrating. However, in the single battery 100 according to one embodiment of the present invention, the butt seam curved portion 173 is preferably located outside the movable region of the first tab free end 1211. The movable region of the first tab free end 1211 may be comprehensively determined through the design size, welding position, and gravity, or may be determined through drawing, but is not limited here. In this embodiment, by disposing the butt seam curved portion 173 located on the front side in the extension direction of the first tab free end 1211 outside the movable region of the first tab free end 1211, the possibility of the first tab free end 1211 passing through the butt seam between the first insulating body 140 and the first insulating bracket 130 can be significantly reduced or completely eliminated.

[0059] In some embodiments of the single battery 100 provided by the present invention, the butt seam bend 173 includes a non-linear stretch butt seam structure. The non-linear stretch butt seam structure is located at least partially within a width range corresponding to the first tab free end 1211. The non-linear stretch butt seam structure includes one or a combination of a sawtooth butt, a wave butt, and a triangular butt. When the substantially planar first tab free end 1211 stretches into the non-linear stretch butt seam structure, the labyrinth gap structure formed by the non-linear stretch butt seam blocks the substantially straight first tab free end 1211, reducing the possibility of the first tab free end 1211 breaking through the butt seam. In order to effectively prevent the first tab free end 1211 from penetrating the nonlinear stretch butt joint structure, part or the entire butt joint between the first insulating body 140 and the first insulating bracket 130 on the opposite side of the first tab free end 1211 may be located outside the movable area of ​​the first tab free end 1211.

[0060] 1 and 9, in the single battery 100 according to one embodiment of the present invention, the blocking structure includes an extension 171. The root of the extension 171 is connected to the first insulating body 140 and / or the first insulating bracket 130, and extends to block the front side of the first tab free end 1211 in the extension direction. The shape of the extension 171 may be, but is not limited to, a trapezoid, a rectangle, a tongue, etc. By providing the extension 171 on the front side of the first tab free end 1211 in the extension direction, the extension 171 can prevent the first tab free end 1211 from continuing to move to contact the housing 110. The extension 171 can block the excess first tab 121, and there is no need to cut the tab. In this way, the production cost is reduced and the battery is improved. Pond Improved safety performance.

[0061] 1 to 6, in one embodiment, the root of the extension 171 is connected to the first insulating body 140, and this connection includes, but is not limited to, integral connection, adhesion, etc. The extension end of the extension 171 extends toward one side of the first insulating bracket 130, thereby forming a shape extending toward the first insulating bracket 130 and blocking the front side of the first tab free end 1211 in the extension direction.

[0062] 9 to 16, in another embodiment, the root of the extension 171 is connected to the first insulating bracket 130, and the connection includes, but is not limited to, integral connection, adhesion, etc. The extension end of the extension 171 extends toward one side of the first insulating body 140, forms a shape extending toward the first insulating body 140, and blocks the front side in the extension direction of the first tab free end 1211. However, a person skilled in the art will understand that in other embodiments, the extension 171 may be provided on both the first insulating body 140 and the first insulating bracket 130, and multiple extensions may be arranged and combined in the width direction of the first tab 121 or the extension direction of the first tab free end 1211 to block the first tab free end 1211 together.

[0063] To achieve a favorable blocking effect, the extension end of extension portion 171 extends beyond the movable area of ​​first tab free end 1211. Such an arrangement can significantly reduce the possibility of penetration by first tab free end 1211 and can also eliminate the possibility of contact between first tab free end 1211 and housing 110.

[0064] Referring to FIG. 1, in the single battery 100 according to one embodiment of the present invention, a corresponding recess 172 is disposed on the first insulating body 140 (or the first insulating bracket 130) at the front side in the extension direction of the extension portion 171. The depth of the recess 172 is preferably slightly greater than the height of the extension portion 171 to avoid interference during assembly. The extension end of the extension portion 171 at least partially extends into the recess 172. The shape of the recess 172 matches the shape of the extension portion 171. For example, when the extension portion 171 is trapezoidal, the recess 172 is also trapezoidal, and the extension portion 171 and the recess 172 abut against each other to form a substantially trapezoidal butt joint with an opening. When the extension portion 171 is trapezoidal, it needs to meet the requirement that it can be inserted into the recess 172 and match the side wall and bottom wall of the recess 172. For example, the shape of the extension 171 may be an isosceles trapezoid with an upper base close to the recess 172, a right-angled trapezoid with an upper base close to the recess 172, or a general trapezoid structure that can be inserted into the recess 172 along a straight line. Furthermore, providing a matching recess 172 in the extension 171 allows a matching concave-convex structure to be formed between the first insulating body 140 and the first insulating bracket 130, and the overall space occupied by the first insulating body 140 and the first insulating bracket 130 in the housing 110 does not change. The butt joint between the first insulating body 140 and the first insulating bracket 130 on the front side in the extension direction of the first tab free end 1211 can also be moved farther away or outward from the movable area of ​​the first tab free end 1211. In this way, the possibility of the first tab free end 1211 breaking through the butt joint between the first insulating body 140 and the first insulating bracket 130 can be reduced.

[0065] 26 and 27, in this embodiment, the recess 172 may be a groove-like structure provided on the inside of the wall of the first insulating body 140 or the wall of the first insulating bracket 130. In this groove structure, the recess 172 penetrates only the wall of the first insulating body 140 or the wall of the first insulating bracket 130 on the side corresponding to the extension portion 171, and an opening into which the extension portion 171 is inserted is formed. In this case, the extension portion 171 and the recess 172 form a plug-in relationship. In the height direction of the first cover plate 150, no seam is formed between the first insulating body 140 and the first insulating bracket 130 on the front side in the extension direction of the extension portion 171, which can effectively prevent the first tab free end 1211 from contacting the housing 110.

[0066] 1, 4, 9 and 12, considering the wall thickness of the first insulating body 140 and the first insulating bracket, in the extension direction of the first tab free end 1211, the recess 172 penetrates the corresponding wall of the first insulating body 140 or the corresponding wall of the first insulating bracket 130 in the single battery 100 according to one embodiment of the present invention. The extension 171 and the recess 172 abut each other to form a butt joint curved portion 173. In the thickness direction of the first cover plate 150, the butt joint of the butt joint curved portion 173 curves away from the contact surface between the first tab 121 and the first terminal 160. In this embodiment, the first tab 121 is welded to the bottom plate 161 of the first terminal 160, and the first tab free end 1211 is close to the contact surface 180 between the first tab 121 and the first terminal 160. Bending the butt seam at butt seam bend 173 away from contact surface 180 between first tab 121 and first terminal 160 can reduce the likelihood of first tab free end 1211 reaching the butt seam and can at least partially reduce the risk of contact between first tab free end 1211 and housing 110.

[0067] 4, in the single battery 100 according to one embodiment of the present invention, the extension 171 and / or the recess 172 are provided with a plug-in guide structure 174 to guide the two to abut against each other. The plug-in guide structure 174 may be disposed only on the extension 171, only on the recess 172, or on both the extension 171 and the recess 172, and the two can match each other to achieve plug-in and guiding. The plug-in guide structure 174 may be of various types. For example, the plug-in guide structure may form a slanted surface or a rounded corner at the notch of the recess 172 to guide the extension 171 to enter, or the plug-in guide structure may be a slanted surface provided on the side wall of the recess 172, and the slanted surface may make the recess 172 form a structure with a wide notch and a narrow bottom. Alternatively, the plug-in guiding structure may be a sloping surface or a rounded corner disposed on the free end of the extension 171, or the plug-in guiding structure may be a sloping surface disposed on the extension 171, which may cause the extension 171 to form a wedge-shaped structure with a narrow free end and a wide base. Alternatively, the above various assemblies may be provided on both the recess 172 and the extension 171.

[0068] Specifically, referring to FIG. 3 and FIG. 8, in one embodiment, the root portion of the extension portion 171 is connected to the first insulating body 140. The first insulating bracket 130 is provided with a recess 172 that matches the extension portion 171, and the extension portion 171 has a substantially trapezoidal shape. The plug-in guide structure 174 includes a first inclined surface 1741 provided on both sides of the extension portion 171 and a second inclined surface 1742 provided on both sides of the recess 172 that matches the first inclined surface 1741. The two first inclined surfaces 1741 and the two second inclined surfaces 1742 are in alignment and abut against each other. The upper bottom of the extension portion 171 and the bottom of the recess 172 abut against each other to form a substantially trapezoidal butt joint without a lower bottom.

[0069] 11 to 16, in another embodiment of the present invention, the root of the extension 171 is connected to the first insulating bracket 130. The first insulating body 140 is provided with a recess 172 that matches the extension 171, and the extension 171 has a substantially trapezoidal shape. The plug-in guide structure 174 includes a first inclined surface 1741 provided on both sides of the extension 171 and a second inclined surface 1742 provided on both sides of the recess 172 that matches the first inclined surface 1741. The two first inclined surfaces 1741 and the two second inclined surfaces 1742 are in alignment and abut against each other. The upper bottom of the extension 171 and the bottom of the recess 172 abut against each other to form a substantially trapezoidal butt joint without a lower bottom.

[0070] Those skilled in the art will understand that if the first inclined surface 1741 is provided on only one side of the above-mentioned extension 171, and the other side is a straight surface, a right-angled trapezoid extension 171 will be formed. The arrangement of a matching second inclined surface 1742 at a position corresponding to the first inclined surface 1741 in the recess 172 can also guide the extension 171 to enter. Alternatively, the extension end of the extension 171 can be provided with an arc structure, and the extension 171 and the recess 172 can also be guided to abut against each other.

[0071] 1, in this embodiment, for the extension 171 and the single-piece first tab 121, the risk of the first tab free end 1211 penetrating the seam is reduced. Referring to FIG. 28, in the single battery 100 according to one embodiment of the present invention, the first tab 121 includes a plurality of stacked first tab pieces 1212, and the free end of the first tab piece 1212 has an uneven end structure. Furthermore, in the thickness direction of the first cover plate 150, the ratio of the height H1 of the extension 171 to the stacked height H2 of the plurality of first tab pieces 1212 is in the range of 2.68 to 3.68. However, if the ratio of H1 to H2 is less than 2.68, there is a risk that the first tab 121 will penetrate the seam between the first insulating body 140 and the first insulating bracket 130. If the ratio of H1 to H2 is greater than 3.68, the recess 172 is too deep, which affects the stability of the first insulating body 140 or the first insulating bracket 130 in which the recess 172 is located. PondAccording to the current structure, the height H1 from the extending end of the extending portion 171 to the contact surface between the first terminal 160 and the first tab 121 is generally 2 mm to 3 mm, and is 2.6 mm in this embodiment.

[0072] Although the structure of the present invention is applicable to various types of single battery 100 having a cover plate, referring to FIG. 1 and FIG. 10, in the single battery 100 according to one embodiment of the present invention, the single battery 100 is a rectangular battery. At the pond The first tab free end 1211 is close to the large surface 112 of the housing 110. In a direction perpendicular to the large surface 112 (i.e., the Y direction in FIG. 1), the orthogonal projection of the extension 171 covers the orthogonal projection of the first tab free end 1211. This arrangement allows the extension 171 to cover as much of the movable area of ​​the first tab free end 1211 as possible, and a favorable blocking effect is achieved.

[0073] 1 and 9, in some embodiments of the present invention, the extension 171 disposed on the first insulating body 140 and / or the first insulating bracket 130 has a draft angle of 1°-10°. The extension 171 is gradually thinned from the extension end to the root of the extension 171 under the effect of the draft angle. The draft angle of 1°-10° not only facilitates the overall demolding of the first insulating body 140, but also prevents the thickness of the extension 171 from excessively changing from the root to the free end, resulting in insufficient hardness of the extension 171.

[0074] 2, in a single battery 100 according to one embodiment of the present invention, the extension 171 is trapezoidal, and the ratio of the width w1 of the short side of the extension to the width w2 of the first tab 121 is 0.5 to 1. If the ratio of w1 to w2 is less than 0.5, the blocking effect of the first tab free end 1211 by the extension 171 is not obvious. If the ratio of w1 to w2 is greater than 1, the weight of the first insulating body 140 or the first insulating bracket 130 increases, and the length of the recess 172 on the first insulating bracket 130 or the first insulating body 140 opposite to the extension 171 also increases, which may reduce the strength of the first insulating bracket 130.

[0075] 3, in a single battery 100 according to one embodiment of the present invention, an extension 171 is disposed in the first insulating body 140. A length w3 of a base portion of the extension 171 is 1 mm to 2 mm longer on one side than a length w4 of an opening of the recess 172 of the first insulating bracket 130. With such an arrangement, the seam between the two can be made small without making assembly difficult due to errors.

[0076] Although the structure of the present invention is applicable to various types of single battery 100 having a cover plate, in the single battery 100 according to one embodiment of the present invention, the single battery 100 is a rectangular battery. At the pond 1 so as to approach the large surface 112 of the housing 110. In a direction perpendicular to the large surface 112, the orthogonal projection of the extension 171 covers the orthogonal projection of the first tab free end 1211, and such an arrangement provides a favorable blocking effect.

[0077] Referring to FIG. 1, in a single battery 100 according to one embodiment of the present invention, a first insulating bracket 130 is provided with a first tab receiving groove 131. In a direction perpendicular to the large surface 112, the orthogonal projection of the first tab receiving groove 131 covers the orthogonal projection of the extension 171. Specifically, in a direction perpendicular to the large surface 112 (i.e., the Y direction in FIG. 1), the length of the orthogonal projection of the root of the extension 171 is greater than the length of the orthogonal projection of the bottom plate 161 of the first terminal 160, and is less than the length of the orthogonal projection of the first tab receiving groove 131. When the length of the orthogonal projection of the root of the extension 171 is greater than the length of the orthogonal projection of the bottom plate 161 of the first terminal 160, the first tab free end 1211 is well blocked. When the length of the orthogonal projection of the extension 171 is less than the length of the first tab receiving groove 131, the difficulty of assembly is reduced. Pond Considering the size, the length of the root part of the extension part 171 in orthogonal projection is preferably 26 to 50 mm, and may be, for example, 26 mm, 35 mm, or 50 mm, but is not limited to this, and is 45 mm in this embodiment.

[0078] 1, 3, 4 and 5, in a single battery 100 according to one embodiment of the present invention, an extension 171 is disposed on the first insulating body 140, and a recess 172 is disposed on the first insulating bracket 130. The root of the extension 171 is connected to the first insulating body 140, such connection including but not limited to integral connection, adhesive, rotating connection, removable snap connection, etc. The extended end of the extension 171 extends toward one side of the electrode assembly 120 and is inserted into the recess 172 on the first insulating bracket 130 to form a trapezoidal butt joint curved portion 173. In the currently available rectangular battery 100, the extension 171 is disposed on the first insulating bracket 130, and the recess 172 is disposed on the first insulating bracket 130. In the currently available rectangular battery 100, the extension 171 is disposed on the first insulating bracket 130. The recess 172 ... Pond Considering the size specifications, it is preferable that the thickness t2 of the extension 171 (if a draft angle is provided, the thickness of the root of the extension 171) is greater than 0.7 mm and is equal to or less than the thickness t1 of the side wall of the first insulating body (i.e., the thickness from the edge of the groove to the outer wall of the first insulating body 140). If the thickness t2 of the extension 171 is less than 0.7 mm, it is highly likely that the hardness of the extension 171 is insufficient and the first tab piece 1212 cannot be blocked. If t2 is greater than t1, the overall weight of the first insulating body 140 increases, and the lateral space utilization rate of the single battery 100 may decrease.

[0079] 9 and 12, in the single battery 100 according to one embodiment of the present invention, the extension 171 is disposed on the first insulating bracket 130. The root of the extension 171 is connected to the first insulating bracket 130, such connection including but not limited to integral connection, adhesive connection, and rotational connection. The free end of the extension 171 extends toward one side of the first cover plate 150 and extends into a recess 172 on the first insulating body 140 to form a trapezoidal butt joint curved portion 173. The ratio of the thickness t3 of the root of the extension 171 to the wall thickness t4 of the first insulating bracket 130 is 0.7 to 1.3. Considering the specifications of currently available single batteries, in this embodiment, the thickness t3 of the root of the extension 171 is 1.25 mm. If the ratio of the thickness t3 of the root of the extension 171 to the thickness t4 of the wall of the first insulating bracket 130 is less than 0.4, the hardness of the extension 171 is likely to be insufficient to block the first tab 121. If the ratio of the thickness t3 of the root of the extension 171 to the thickness t4 of the wall of the first insulating bracket 130 is greater than 0.6, the contact area between the first insulating body 140 and the first insulating bracket 130 increases, making assembly more difficult and reducing structural stability. Considering the related structures and sizes of the currently available first insulating bracket 130 and the first insulating body 140, the height H3 of the extension 171 is preferably 1 mm to 1.8 mm, for example, but not limited to, 1 mm, 1.3 mm, 1.5 mm, or 1.8 mm. The ratio of the height H3 of the extension 171 to the height H4 of the first insulating body 140 is 0.45 to 0.8. If the ratio of the height H3 of the extension 171 to the height H4 of the first insulating body 140 is less than 0.45, there is still a risk of the first tab 121 breaking through the seam between the first insulating body 140 and the first insulating bracket 130. If the ratio of the height H3 of the extension 171 to the height H4 of the first insulating body 140 is greater than 0.8, the first tab 121 is prevented from breaking through the seam, but the overall weight of the cell may increase.

[0080] 17 to 20, in a single battery 100 according to another embodiment of the present invention, the root portion of the extension portion 171 may be bent or rotatably connected to the first insulating body 140. The first insulating bracket 130 is not provided with a recess 172. The extension portion 171 extends to the inside of the side wall of the first insulating bracket 130 and blocks the front side in the extension direction of the first tab free end 1211. The bendable connection structure includes, but is not limited to, providing a relatively flexible connection at the root portion of the extension portion 171, or providing the extension portion 171 as a bendable material having a certain hardness. The rotatable connection structure includes, but is not limited to, a matching structure of a rotating shaft and a groove. For example, a fixed or rotating shaft may be provided in the extension portion 171, a groove matching the shaft may be provided in the first insulating body 140, and the shaft may be inserted into the groove to achieve rotation. Alternatively, a fixed or rotating shaft may be provided on the first insulating body 140, a groove corresponding to the shaft may be provided at the root of the extension 171, and the shaft may be inserted into the groove to achieve rotation. In this way, before the first cover plate 150 is sealed and assembled to the housing 110, the extension 171 may first be inverted or bent outwardly into a first state, which can provide sufficient space for welding between the first tab 121 and the first terminal 160. When the welding is completed and the first cover plate 150 needs to be rotated to seal the first cover plate 150 in the first opening 111, the extension 171 may be inverted or bent into a second state perpendicular to the plate surface of the first cover plate 150. Thus, the extension 171 can be inserted inside the side wall of the first insulating bracket 130 during the inversion process to block the seam between the first insulating body 140 and the first insulating bracket 130.

[0081] 23 to 25, in a single battery 100 according to another embodiment of the present invention, a root portion of the extension portion 171 is connected to the first insulating bracket 130 so as to be bendable or rotatable. The bendable connection structure includes, but is not limited to, providing a relatively flexible connection band at the root portion of the extension portion 171, or setting the extension portion 171 to a bendable material having a specific hardness. The rotatable connection structure includes, but is not limited to, a matching structure of a rotating shaft and a groove. For example, a fixed or rotating shaft may be provided on the extension portion 171, a groove corresponding to the shaft may be provided on the first insulating bracket 130, and the shaft may be inserted into the groove to achieve rotation. Alternatively, a fixed or rotating shaft may be provided on the first insulating bracket 130, and a groove corresponding to the shaft may be provided on the root portion of the extension portion 171, and the shaft may be inserted into the groove to achieve rotation. Before the first cover plate 150 is assembled to seal the housing 110, the extension 171 may first be inverted or bent outwardly into a first state, which can provide sufficient space for welding the first tab 121 and the first terminal 160. When the welding is completed and the first cover plate 150 needs to be rotated to seal the first cover plate 150 in the first opening 111, the extension 171 may be inverted or bent into a second state perpendicular to the plate surface of the first cover plate 150. Thus, the extension 171 can be inserted inside the side wall of the first insulating body 140 during the inversion process to block the seam between the first insulating body 140 and the first insulating bracket 130. It should be noted that the root portion of the extension portion 171 may be integrally connected to the first insulating bracket 130 in a non-flexible manner as shown in Fig. 22, and may be provided outside the joint between the first insulating body 140 and the first insulating bracket 130 corresponding to the front side in the extension direction of the first tab free end. In this way, even if the first tab free end 1211 penetrates the front joint, it can be blocked by the extension portion.

[0082] Referring to FIG. 1, in a single battery 100 according to an embodiment of the present invention, a first insulating bracket 130 includes a tab collecting structure 132 for collecting the first tabs 121. As long as the first tabs 121 can be arranged, the tab collecting structure 132 may have various shapes. The tab collecting structure 132 in the present invention includes a first protrusion 1321 arranged at the other end opposite to the extension 171. The first protrusion 1321 is connected to the first insulating bracket 130 and protrudes toward one side of the extension 171. The first tab receiving groove 131 is formed on the side of the first protrusion 1321 that is closer to the first cover plate 150. The first protrusion 1321 allows the first tabs 121 to be tightly fixed between the first insulating bracket 130 and the bottom plate 161 of the first terminal 160 when the first tabs 121 are bent and curved, thereby facilitating welding of the first tabs 121 to the bottom plate 161 of the first terminal 160.

[0083] 1 again, in another embodiment of the present invention, the tab collecting structure 132 further includes a second protrusion 1322 disposed on the opposite side to the first protrusion 1321. The second protrusion 1322 is connected to the first insulating bracket 130 and protrudes toward one side of the first protrusion 1321. The second protrusion 1322 is used to support the first tab free end 1211 to prevent the first tab free end 1211 from being inserted upside down and breaking through the separator of the electrode assembly. Of course, a person skilled in the art would understand that, without considering the accumulation of the above beneficial effects, it is sufficient to provide only the first protrusion 1321 or the second protrusion 1322 on the insulating bracket 130.

[0084] Although the housing 110 of the present invention only has the first opening 111, in one embodiment of the present invention, the housing 110 may also include a second opening. The second opening is provided on the other side of the housing 110 opposite the first opening 111, forming a generally rectangular parallelepiped channel with two-way openings in the housing 110. The single battery further includes a second cover plate (not shown). The structure of the second cover plate and the mounting structure on the housing 110 are different from currently available dual path battery cells. PondThe structure of the second cover plate may be set with reference to the structure of the negative electrode side cover, and may be the same as the structure of the first cover plate 150 in the present invention, as long as the second cover plate can seal and pack the second opening. In this embodiment, the form of the second cover plate packing the second opening may be set with reference to the mounting form of the first cover plate 150 and the first opening 111. A second tab (not shown) extends from the other end of the electrode assembly 120 away from the first tab 121. Furthermore, the polarity of the second tab and the first tab 121 is opposite, and the second tab is a negative tab. The second tab is electrically connected to the second cover plate or a terminal on the second cover plate. It should be noted that in this embodiment, the first tab 121 may be a negative tab, and the second tab may be a positive tab. A second insulating member and a second insulating bracket may be disposed between the second cover plate and the electrode assembly 120. The structure of the second insulating member may be the same as the structure of the first insulating body 140, and may be referenced to the plastic structure on the currently available negative electrode side. The structure of the second insulating bracket may be the same as that of the first insulating bracket 130, and may refer to the structure of a currently available negative electrode side insulating bracket. Furthermore, a person skilled in the art will understand that the housing 110 may play the role of the negative electrode, and the second insulating member and the second insulating bracket may not be provided.

[0085] It should be noted that in the present invention, when the butt seam bend or butt seam between the extension and the recess is located outside the movable area of ​​the first tab free end, the butt seam does not need to be specifically defined. Ideally, the gap of the butt seam is 0 mm. However, considering the interference and error of assembly, in the present invention, the gap in the butt seam (i.e., the butt seam bend) between the extension and the recess is 0.2 mm to 0.4 mm, for example, the gap may be any value between 0.2 mm to 0.4 mm, such as 0.2 mm, 0.3 mm, 0.4 mm, etc. A gap less than 0.4 mm is not suitable for assembly, and a gap larger than 0.4 mm will occupy the internal space of the cell and cannot ensure the blocking effect of the tab.

[0086] Referring to FIG. 29, the present invention further provides a battery 10, which includes a single battery 100 according to any one of the above embodiments. The battery 10 may be, but is not limited to, a battery module, a battery block, or a battery pack. In one embodiment of the present invention, the battery 10 includes a box and at least one single battery 100. The box includes a first box 101 and a second box 102. The first box 101 and the second box 102 cover each other to form a storage space, and a plurality of single batteries 100 are stored in the storage space. The plurality of single batteries 100 may be connected in series and / or in parallel.

[0087] Referring to FIG. 30, the present invention further provides an electric device 1. The electric device 1 may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, an aerospace vehicle, an electric toy, an electric tool, etc. The vehicle may be, but is not limited to, a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extending vehicle, etc. The aerospace vehicle includes, but is not limited to, an airplane, a rocket, a space shuttle, a spaceship, etc. The electric toy includes, but is not limited to, a stationary or mobile electric toy, such as, but is not limited to, a game console, an electric car toy, an electric boat toy, an electric plane toy, etc. The electric tool includes, but is not limited to, a metal cutting electric tool, a grinding electric tool, an assembly electric tool, a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, an electric planer, etc.

[0088] In the present invention, the electric device 1 includes an operating unit 11 and the above-mentioned battery 10. The operating unit 11 is electrically connected to the battery 10 to obtain electric energy support. The operating unit 11 may be a unit component that can obtain electric energy from the battery 10 and perform corresponding operations, such as a blade rotation unit of a fan, a dust collection operation unit of a vacuum cleaner, a wheel drive unit of an electric vehicle, etc. In the embodiment of the present invention, the above-mentioned electric device is not particularly limited.

[0089] In the electric device 1 according to the embodiment of the present invention, the electric device 1 is a vehicle, the operating unit 11 is a vehicle body, and the battery 10 is fixedly attached to the vehicle body to provide driving force to the vehicle and realize the operation of the vehicle. [Industrial Applicability]

[0090] In the single battery provided by the present invention, the first insulating body and / or the first insulating bracket arranged at the front side in the extension direction of the first tab free end is provided with a tab block structure. The tab block structure prevents the first tab free end from passing through the joint between the first insulating body and the first insulating bracket, and prevents the first tab from contacting the housing. The extension blocks the excess first tab piece, and there is no need to cut the tab. In this way, the production cost is reduced and the safety performance of the battery is improved. The battery and the electric device of the present invention include the single battery of the present invention, and the safety performance of the battery is improved and the production cost is reduced. Therefore, some practical problems in the related art are effectively overcome, and the present invention has high utility value and utility significance. The above-mentioned embodiment only illustrates the principle and effect of the present invention, and is not intended to limit the present invention. Those skilled in the art may modify or change the above-mentioned embodiment without departing from the spirit and scope of the present invention. Therefore, equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention are also included in the scope of the claims of the present invention. [Explanation of symbols]

[0091] 1: Electrical equipment 10:Battery 11: Operating unit 101: 1st box body 102:Second box body 100: Single battery 110: Housing 111: First opening 112: Big Face 120: Electrode assembly 121: First tab 1211: First tab free end 130: First insulating bracket 131: First tab receiving groove 132: Tab collection structure 1321: First convex part 1322: Second convex part 133: First tab through hole 140: First insulating body 150: First cover plate 151: First positioning structure 160: 1st terminal 161: Bottom plate 170: Tab block structure 171: Stretching section 172: Recess 173: Butt joint curved section 174: Plug-in structure 1741:First slope 1742:Second slope 180: Contact surface 190: First Containment Space 20: First insulating member

Claims

1. a housing including a first opening; a first cover plate attached to seal the first opening; a first terminal attached to the first cover plate; an electrode assembly disposed within the housing and including a first tab extending from a side proximate the first cover plate; a first insulating member attached to a side of the first cover plate close to the electrode assembly; Including, the first tab is fixedly connected to the first terminal and is formed with a first tab free end; the first insulating member is provided with a tab block structure, and the tab block structure and a side of the first terminal close to the electrode assembly form a first accommodating space, the first accommodating space is used to limit a movable range of the first tab free end, and the housing is located outside the first accommodating space. Single battery.

2. The tab block structure is disposed on the front side in the extension direction of the first tab free end. The unit battery according to claim 1 .

3. the first tab includes a plurality of stacked first tab pieces, the free ends of the first tab pieces having a ragged end configuration; The unit battery according to claim 1 .

4. the first insulating member includes a first insulating body and a first insulating bracket disposed between the first insulating body and the electrode assembly; the tab blocking structure is provided on the first insulating body and / or the first insulating bracket and is configured to block the first tab free end from passing through a gap between the first insulating body and the first insulating bracket; The unit battery according to claim 1 .

5. the tab block structure includes a butt joint bend disposed at abutment between the first insulating body and the first insulating bracket; The unit battery according to claim 4 .

6. In a thickness direction of the first cover plate, the butt seam of the butt seam bend portion bends in a direction away from a contact surface between the first tab and the first terminal. The unit battery according to claim 5 .

7. the butt seam curved portion is located outside of the movable area of ​​the first tab free end; The unit battery according to claim 5 .

8. a part or all of a butt joint between the first insulating body and the first insulating bracket on a front side in an extension direction of the first tab free end is located outside a movable area of ​​the first tab free end; The unit battery according to claim 4 .

9. the tab block structure includes an extension portion connected to the first insulating body and / or the first insulating bracket and extending to block a front side in an extension direction of the first tab free end, The extension end of the extension portion extends beyond the movable area of ​​the first tab free end. The unit battery according to claim 1 .

10. a recess is provided in the first insulating bracket or the first insulating body at a front side in an extension direction of the extension portion, and the extension end at least partially extends into the recess; The unitary battery according to claim 9 .

11. In the extending direction of the first tab free end, the recess penetrates the corresponding wall of the first insulating body or the corresponding wall of the first insulating bracket; the extension and the recess are butted together to form a butt seam curvature; In a thickness direction of the first cover plate, the butt seam of the butt seam bend portion bends in a direction away from a contact surface between the first tab and the first terminal. The unitary battery according to claim 10.

12. The extension portion and / or the recessed portion are provided with a plug-in guide structure for guiding the extension portion and the recessed portion to be butted together, The plug-in guide structure includes one or a combination of a rounded corner and a sloped surface; The unitary battery according to claim 10.

13. The single battery is a rectangular battery, the first tab free end is proximate a large surface of the housing; The first insulating bracket has a first tab receiving groove; an orthogonal projection of the extension portion covers an orthogonal projection of the first tab free end in a direction perpendicular to the large surface, and an orthogonal projection of the first tab receiving groove covers an orthogonal projection of the extension portion; The unitary battery according to claim 9 .

14. the first terminal is disposed on a side of the first cover plate adjacent to the electrode assembly and includes a bottom plate welded to the first tab; The unit battery according to claim 1 .

15. the connection between the root of the extension and the first insulating body or the first insulating bracket includes any one of an integral connection, an adhesive, a removable snap connection, a bendable connection, and a rotatable connection; The unit battery according to claim 1 .

16. the first insulating bracket includes a collecting tab structure for collecting the first tabs; the tab collection structure includes a first protrusion opposite the extension, the first protrusion being connected to the first insulating bracket and protruding toward one side of the extension; The unit battery according to claim 1 .

17. the tab collection structure further includes a second protrusion disposed on an opposite side to the first protrusion, the second protrusion being connected to the first insulating bracket and protruding toward one side of the first protrusion; The unitary battery according to claim 16.

18. The housing further includes a second opening; the second opening and the first opening are disposed on opposite sides of the housing, the single battery further includes a second cover plate attached to the second opening and sealing the second opening; the electrode assembly includes a second tab extending from a side proximate the second cover plate; the second tab is conductively connected to the housing, the second cover plate, or a terminal on the second cover plate; the first tab being a positive tab and the second tab being a negative tab; The unit battery according to claim 1 .

19. A single battery according to any one of claims 1 to 18. Including, battery.

20. A single battery according to any one of claims 1 to 18. Including, Electrical equipment.

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