Battery cell, battery, and electric device

Abstract

The present disclosure relates to the technical field of batteries, and provides a battery cell, a battery, and an electric device. The battery cell comprises: a casing, a first cover plate, a first terminal, an electrode assembly, a first insulating member, and a first insulating support. The casing comprises a first opening; the first cover plate is sealingly mounted on the first opening; the first terminal is mounted on the first cover plate; the electrode assembly is arranged in the casing, a first tab extends from the side of the electrode assembly close to the first cover plate, at least part of the first tab is fixedly connected to the first terminal, and a first tab free end is formed; the first insulating member is mounted on the side of the first cover plate close to the electrode assembly; and the first insulating support is arranged between the first insulating member and the electrode assembly, wherein the first tab free end is provided with an insulating structure. The insulating structure in the present disclosure insulates and isolates the first tab free end from the casing, and there is no need to carry out a tab cutting process, reducing the production costs, and improving the safety performance of the battery.

Description

Single cell, battery and power-consuming device Technical Field

[0001] The present disclosure relates to the technical field of batteries, and in particular to a single cell, a battery, and an electrical device. Background Art

[0002] In existing single-cell batteries, in order to prevent the pole tabs from contacting the shell, insulating parts and insulating brackets are usually set between the pole tabs and the shell. After welding, the redundant free ends of multiple pole tabs are still easy to extend from the gap between the insulating parts and the insulating brackets and contact the inner wall of the shell, thereby making the pole tabs and the shell conductive, causing the single-cell battery to short-circuit, which reduces the safety of the battery and poses a safety hazard.

[0003] Public content

[0004] In view of the above shortcomings of the prior art, the present disclosure provides a single cell, a battery and an electrical device to improve the technical problem in the existing single cell where the tabs extend from the gap between the insulating member and the insulating bracket and contact the inner wall of the shell, posing a short circuit risk.

[0005] To achieve the above-mentioned objectives and other related objectives, the present disclosure provides a single cell battery, comprising: a housing, a first cover plate, a first terminal, an electrode assembly, a first insulating member, and a first insulating support. The housing includes a first opening; the first cover plate is sealingly mounted to the first opening; the first terminal is mounted to the first cover plate; the electrode assembly is disposed within the housing, and a first tab extends from a side proximate to the first cover plate, at least a portion of the first tab is fixedly connected to the first terminal, and a first tab free end is formed; the first insulating member is mounted on a side of the first cover plate proximate to the electrode assembly; the first insulating support is disposed between the first insulating member and the electrode assembly; and the first tab free end is provided with an insulating structure.

[0006] In an example of the single cell disclosed herein, the insulating structure is coated on the free end of the first tab.

[0007] In an example of the single cell disclosed herein, the insulating structure includes an insulating tape, and the insulating tape is bonded to the free end of the first tab.

[0008] In an example of the single cell disclosed herein, the peel strength of the insulating tape is 9 to 18 N / mm.

[0009] In an example of the single cell disclosed herein, the free end of the first tab includes a stacking fault region, and the insulating tape covers the stacking fault region.

[0010] In an example of the single cell battery disclosed herein, one end of the insulating tape is adhered to a side of the free end of the first tab close to the first terminal, and the other end of the insulating tape is adhered to a side of the first tab away from the first terminal and close to the root of the first tab.

[0011] In an example of the single battery disclosed herein, the connection area between the first tab and the first terminal is a connection zone, and on the connection surface between the first tab and the first terminal, the orthographic projection of the connection zone is within the orthographic projection of the insulating tape.

[0012] In an example of the single battery cell disclosed herein, in a direction perpendicular to the extending direction of the first electrode tab, a width D1 of the insulating tape is greater than a width D2 of the first electrode tab.

[0013] In an example of the single cell disclosed herein, the first insulating support includes a first tab retracting structure.

[0014] In an example of the single cell disclosed herein, the first tab folding structure includes a first protrusion, which extends from a side of the first insulating bracket away from the free end of the first tab to a side close to the free end of the first tab.

[0015] The present disclosure also provides a battery, which includes any of the above-mentioned single cells.

[0016] The present disclosure also provides an electrical device, which includes any of the above-mentioned single batteries.

[0017] In the single cell, battery and electrical device disclosed herein, the free end of the first pole tab is covered with an insulating structure. On the one hand, the insulating structure increases the thickness of the free end of the first pole tab, which can reduce the possibility of the free end of the first pole tab extending into the gap between the first insulating member and the first insulating bracket; on the other hand, even if the free end of the first pole tab extends into the gap between the first insulating member and the first insulating bracket, the insulating structure can insulate the free end of the first pole tab from the shell, avoiding the risk of short circuit; furthermore, by providing the insulating structure, there is no need to perform the pole tab cutting process, thereby avoiding the problem of debris generated by cutting redundant pole tabs damaging the internal structure of the single cell and causing short circuit, reducing production costs and improving battery safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] FIG1 is a cross-sectional schematic diagram of one side of a first cover plate in an embodiment of a single cell disclosed herein;

[0020] Figure 2 is an enlarged view of area A in Figure 1;

[0021] FIG3 is a schematic diagram of a single battery in an embodiment of the present disclosure after welding of the first tab and the first terminal;

[0022] Figure 4 is an enlarged view of area B in Figure 3;

[0023] FIG5 is a front view of a first insulating bracket in an embodiment of a single cell of the present disclosure;

[0024] FIG6 is a schematic structural diagram of a stacking fault region in an embodiment of a single cell of the present disclosure;

[0025] FIG7 is a schematic structural diagram of a free end of a first tab covered with insulating tape in an embodiment of a single cell of the present disclosure;

[0026] FIG8 is a schematic structural diagram of an embodiment of a battery disclosed herein;

[0027] FIG9 is a schematic structural diagram of an electric device according to an embodiment of the present disclosure.

[0028] Component number description

[0029] 1. Electrical device; 10. Battery; 11. Working part; 101. Box body; 102. Box cover; 100. Single cell; 110. Shell; 111. First opening; 120. First cover plate; 130. Electrode assembly; 131. First tab; 132. Free end of first tab; 133. Stacking fault region; 140. First terminal; 150. First insulating member; 160. First insulating bracket; 170. First tab retracting structure; 171. First protrusion; 172. Second protrusion; 173. First groove; 174. Second groove; 200. Insulation structure; 201. Insulating tape; 210. One end; 220. The other end. DETAILED DESCRIPTION

[0030] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following examples and the features in the examples can be combined with each other unless there is a conflict. It should also be understood that the terms used in the examples of the present disclosure are for the purpose of describing specific embodiments, not for the purpose of limiting the scope of protection of the present disclosure. The test methods for which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0031] When numerical ranges are given in the examples, it should be understood that unless otherwise specified in this disclosure, both endpoints of each numerical range and any value between the two endpoints can be used. Unless otherwise defined, all technical and scientific terms used in this disclosure are consistent with the prior art knowledge of those skilled in the art and the description of this disclosure. Any prior art methods, equipment, and materials similar or equivalent to those in the examples of this disclosure can also be used to implement this disclosure.

[0032] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present disclosure. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present disclosure without substantially changing the technical content.

[0033] 1 to 9 , the present disclosure provides a single cell, a battery, and an electrical device. In the single cell 100, the first tab free end 132 is covered with an insulating structure 200. The insulating structure 200 can, on the one hand, increase the thickness of the first tab free end 132 and reduce the possibility of the first tab free end 132 extending into the gap between the first insulating member 150 and the first insulating bracket 160. On the other hand, even if the first tab free end 132 extends into the gap between the first insulating member 150 and the first insulating bracket 160, the insulating structure 200 can still insulate the first tab free end 132 from the housing 110. Furthermore, by setting up the structure, the tab cutting process is no longer required, thereby avoiding the problem of debris generated by cutting redundant tabs damaging the internal structure of the single cell 100 and causing short circuits, thereby reducing production costs and improving battery safety.

[0034] Referring to Figure 1 , which is a schematic cross-sectional view of one side of a first cover plate in one embodiment of a single cell battery disclosed herein, the present disclosure provides a single cell battery 100 comprising: a housing 110 , a first cover plate 120 , a first terminal 140 , an electrode assembly 130 , a first insulating member 150 , and a first insulating bracket 160 .

[0035] Please refer to Figures 1 and 3. Figure 3 is a schematic diagram of an embodiment of a single cell battery disclosed herein after welding of the first tab to the first terminal. A housing 110 is formed within the housing, with a first opening 111 located at one end of the housing. The electrode assembly 130 is assembled in the housing through the first opening 111. The housing 110 can have a variety of shapes, such as approximately rectangular, approximately cylindrical, approximately prismatic, etc. The housing 110 can be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. To prevent the housing 110 from rusting during long-term use, a layer of rust-proof material, such as metallic nickel, can also be plated on the surface of the housing 110.

[0036] Referring to Figures 1 and 3 , the first cover plate 120 is sealed against the first opening 111. The first cover plate 120 may be circular, rectangular, or another suitable shape, as long as it can be securely mounted on the housing 110 and seal the first opening 111. Specifically, considering the overall volume, the shape of the first cover plate 120 is preferably similar to that of the first opening 111.

[0037] Referring to FIG1 , the electrode assembly 130 is disposed within the housing 110 , which may contain one or more electrode assemblies 130 . The electrode assembly 130 is primarily formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is typically provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, with the positive electrode active material layer being coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode coating region and a positive electrode tab connected to the positive electrode coating region, with the positive electrode coating region coated with the positive electrode active material layer, while the positive electrode tab is not coated with the positive electrode active material layer. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, with the negative electrode active material layer being coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating region and a negative electrode tab connected to the negative electrode coating region, with the negative electrode coating region coated with the negative electrode active material layer, while the negative electrode tab is not coated with the negative electrode active material layer. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, and the positive electrode active material layer includes a positive electrode active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode current collector can be made of copper, and the negative electrode active material layer includes a negative electrode active material, which can be carbon or silicon. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). To protect and insulate the battery cell, an insulating film can be applied to the outside of the cell. The insulating film can be made of PP, PE, PET, PVC, or other polymer materials.

[0038] Referring to Figure 1 , a first tab 131 extends from one side of the electrode assembly 130 near the first cover plate 120. The first tab 131 can be either the positive or negative electrode tab described above, without particular limitation. In this embodiment, the first tab 131 is a positive electrode tab. At least a portion of the first tab 131 is electrically connected to the first terminal 140 and defines a first tab free end 132.

[0039] Referring to Figure 1 , the first insulating member 150 is mounted on the side of the first cover 120 near the electrode assembly 130. The structure and mounting method of the first insulating member 150 are not limited; for example, the structure and mounting method of the lower plastic member in the existing single cell 100 can be similar, but are not limited to such. In this embodiment, the first terminal 140 is mounted through the first cover 120 and the first insulating member 150. The first insulating member 150 can be made of any suitable insulating material, including but not limited to rubber and plastic.

[0040] Referring to Figure 1 , the first insulating support 160 is disposed between the first insulating member 150 and the electrode assembly 130. Specifically, it includes a surrounding sidewall and a through-hole corresponding to the position of the first electrode tab 131. The first electrode tab 131 extends through the through-hole and is conductively connected to the first terminal 140. The first insulating support 160 is also made of any suitable insulating material, including but not limited to rubber and plastic.

[0041] Please refer to Figures 1 and 2, which are enlarged views of area A in Figure 1. The first tab free end 132 is covered with an insulating structure 200. The insulating structure 200 increases the outer dimensions of the first tab free end 132, thereby reducing the possibility of the first tab free end 132 extending into the gap between the first insulating member 150 and the first insulating support 160. Furthermore, even if the first tab free end 132 extends into the gap between the first insulating member 150 and the first insulating support 160, the insulating structure 200 can still insulate the first tab free end 132 from the housing 110, preventing battery safety issues such as short circuits.

[0042] Referring to Figures 1 to 3 , in one example of a single-cell battery disclosed herein, an insulating structure 200 is coated around the first tab free end 132. The insulating structure 200 includes, but is not limited to, any insulating material, such as insulating tape 201, an insulating sleeve, and an insulating coating. In the present disclosure, the insulating structure 200 utilizes insulating tape 201. Insulating tape 201 is low-cost and highly malleable, easily conforming to the various shapes of the first tab free end 132. In the present disclosure, the insulating tape 201 is bonded to the first tab free end 132, facilitating easy assembly.

[0043] Referring to Figures 1 and 3 , in an example of a single cell battery disclosed herein, the peel strength of the insulating tape 201 is preferably between 9 and 18 N / mm, and can be any value within the range of 9 to 18 N / mm, such as 9 N / mm, 12 N / mm, 15 N / mm, or 18 N / mm. If the peel strength of the insulating tape 201 is less than 9 N / mm, the adhesive strength between the insulating tape 201 and the first tab free end 132 is insufficient, making debonding more likely. This increases the risk of the first tab free end 132 protruding into the first insulating member 150 and the first insulating support 160. If the peel strength of the insulating tape 201 is greater than 18 N / mm, the cost of the insulating tape 201 is excessively high, increasing the cost of the single cell battery 100.

[0044] Please refer to Figures 1 and 6. Figure 6 is a schematic diagram of the structure of the stacking region in one embodiment of a single cell battery disclosed herein. In this example of a single cell battery disclosed herein, the free end 132 of the first tab includes a stacking region 133. Multiple positive electrode sheets are wound or stacked to form the first tab 131. The size differences between the free ends of the multiple positive electrode sheets form the stacking region 133 at the free end 132 of the first tab. Insulating tape 201 covers the stacking region 133 along the extension direction of the free end 132 of the first tab, ensuring insulation protection for the free ends of all positive electrode sheets that comprise the first tab 131.

[0045] Please refer to Figures 1, 2, and 7. Figure 7 is a schematic diagram of the structure of the first tab free end covered with insulating tape in one embodiment of the single cell battery disclosed herein. In this example of the single cell battery disclosed herein, one end 210 of the insulating tape 201 is bonded to the side of the first tab free end 132 near the first terminal 140, and the other end 220 of the insulating tape 201 is bonded to the side of the first tab 131 away from the first terminal 140 and near the base of the first tab 131. After one end 210 of the insulating tape 201 is bonded to the side of the first tab free end 132 near the first terminal 140, the other end 220 of the insulating tape 201 bypasses the first tab free end 132 and bonds to the side of the first tab 131 away from the first terminal 140, thereby covering the first tab free end 132. At the same time, during the bonding process of the insulating tape 201, the insulating tape 201 is used to constrain the direction of the free end 132 of the first pole tab, so that the free end 132 of the first pole tab is oriented to avoid the position of the gap between the first insulating member 150 and the first insulating bracket 160, further reducing the possibility of the free end 132 of the first pole tab being close to the base shell 110.

[0046] Referring to Figures 1 to 3 , in one example of a single cell battery disclosed herein, the connection area between the first tab 131 and the first terminal 140 is referred to as the connection region. The first tab 131 also includes an ultrasonic pre-welding area, where the positive electrode tabs are connected by ultrasonic pre-welding. To minimize the current path and losses during operation of the single cell 100, the connection region includes the ultrasonic pre-welding area. On the connection surface between the first tab 131 and the first terminal 140, the orthographic projection of the connection region is within the orthographic projection of the insulating tape 201. Specifically, the other end 220 of the insulating tape 201 extends toward the base of the first tab 131, covering at least the corresponding area of ​​the connection region on the side of the first tab 131 facing away from the first terminal 140. This provides protection for this area, while also increasing the bonding area between the insulating tape 201 and the first tab 131, ensuring bonding strength and, consequently, ensuring the effectiveness of the insulating tape 201 in constraining the extension direction of the free end 132 of the first tab.

[0047] Please refer to Figures 1, 3, and 4, with Figure 4 showing an enlarged view of area B in Figure 3. In one example of a single cell battery disclosed herein, the width D1 of the insulating tape 201 is greater than the width D2 of the first tab 131 in a direction perpendicular to the direction in which the first tab 131 extends. When the first tab 131 extends into the gap between the first insulating support 160 and the first insulating member 150, the housing 110 is positioned in the direction in which the first tab 131 extends. The insulating tape 201 can only effectively insulate and isolate the first tab free end 132 from the housing 110 if the width D1 is no less than the width D2 of the first tab 131. In this embodiment, by making the width D1 of the insulating tape 201 greater than the width D2 of the first tab 131, the edge of the first tab free end 132 in the direction of width D2 is further ensured to be within the insulation isolation range of the insulating tape 201, further ensuring the safety of the single cell battery 100.

[0048] 1 , in an example of a single cell of the present disclosure, the first insulating support 160 includes a first tab folding structure 170. The first tab folding structure 170 stacks and folds the non-welded areas of the first tab 131 in an orderly manner, so that the first tab 131 remains stable in position within the single cell 100.

[0049] Please refer to Figures 1 and 5. Figure 5 is a front view of the first insulating bracket in an embodiment of a single cell battery disclosed herein. In this example of a single cell battery disclosed herein, the first tab folding structure 170 can take a variety of forms as long as it can achieve positioning of the first tab 131. In this example of a single cell battery disclosed herein, the first tab folding structure 170 includes a first protrusion 171 away from the first tab free end 132. The first protrusion 171 is connected to the first insulating bracket 160 and extends toward the first tab free end 132. The first protrusion 171, the first insulating bracket 160, and the first terminal 140 form a first groove 173, thereby allowing the first tab 131 to be tightly fixed between the first insulating bracket 160 and the first terminal 140 when folded and bent.

[0050] Referring to Figures 1 and 5 , in one example of a single cell battery disclosed herein, the first tab retracting structure 170 further includes a second protrusion 172 disposed on an opposite side of the first protrusion 171. The root of the second protrusion 172 is connected to the first insulating support 160 and extends toward the first protrusion 171. The second protrusion 172, the first insulating support 160, and the first terminal 140 form a second groove 174. In this embodiment, the insulating tape 201 constrains the extension direction of the first tab free end 132 to be inserted in an inverted direction toward the electrode assembly 130. The second groove 174 is configured to confine the inverted first tab free end 132, protecting the electrode assembly 130.

[0051] Please refer to Figure 8, which is a schematic diagram of the structure of an embodiment of a battery of the present disclosure. The present disclosure also provides a battery 10, which includes any of the above-mentioned single cells 100. The battery 10 can be a battery module, a battery module, or a battery pack, etc., but is not limited thereto. In one embodiment of the present disclosure, the battery 10 includes a case 101 and at least one single cell 100; the case 101 includes a case 101 and a case cover 102, and the case 101 and the case cover 102 cover each other to form a storage space, and multiple single cells 100 are accommodated in the storage space, and the multiple single cells 100 can be connected in series and / or in parallel.

[0052] Please refer to Figure 9, which is a schematic structural diagram of an embodiment of an electric device disclosed in the present disclosure. The present disclosure also provides an electric device 1, which can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft includes airplanes, rockets, space shuttles, and spacecraft, and the like; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like, but are not limited thereto.

[0053] In the disclosed electrical device 1, the electrical device 1 includes a working unit 11 and a battery 10. The working unit 11 is electrically connected to the battery 10 to obtain electrical energy. The working unit 11 can be a unit component that can obtain electrical energy from the battery 10 and perform corresponding operations, such as the blade rotation unit of a fan, the dust collection unit of a vacuum cleaner, or the wheel drive unit of an electric vehicle. The embodiments of the present application do not impose any special limitations on the above-mentioned electrical device 1.

[0054] Please refer to FIG9 . In one embodiment of the electric device 1 disclosed herein, the electric device 1 is a vehicle, the working part 11 is the vehicle body, and the battery 10 is fixedly mounted on the vehicle body to provide driving force for the vehicle to operate.

[0055] In the disclosed single cell, battery, and electrical device, the free end of the first tab is coated with an insulating structure. This insulating structure reduces the possibility of the free end of the first tab protruding into the gap between the first insulating member and the first insulating support. Even if the free end of the first tab does protrude into the gap between the first insulating member and the first insulating support, the insulating structure insulates the free end of the first tab from the housing. Furthermore, this structure eliminates the need for tab cutting, preventing damage to the internal structure of the single cell and short circuits caused by debris from cutting redundant tabs. This reduces production costs and improves battery safety. The disclosed battery and electrical device, including the disclosed single cell, exhibits superior safety performance at a lower cost. Therefore, the present disclosure effectively overcomes several practical issues in the prior art, resulting in high utility and practical significance. The above-described embodiments are merely illustrative of the principles and effectiveness of the present disclosure and are not intended to limit the present disclosure. Anyone skilled in the art may modify or alter the above-described embodiments without departing from the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by persons having ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in this disclosure should still be covered by the claims of this disclosure.

Claims

1. A single cell (100), characterized in that: include: A housing (110), the housing (110) comprising a first opening (111); A first cover plate (120) is sealingly mounted on the first opening (111); A first terminal (140) mounted on the first cover plate (120); An electrode assembly (130) is arranged in the housing (110), and a first pole lug (131) extends from a side close to the first cover plate (120), at least a portion of the first pole lug (131) is fixedly connected to the first terminal (140), and a first pole lug free end (132) is formed; A first insulating member (150) is mounted on a side of the first cover plate (120) close to the electrode assembly (130); A first insulating support (160) is disposed between the first insulating member (150) and the electrode assembly (130); Wherein, the first pole tab free end (132) is provided with an insulating structure (200).

2. The single cell (100) according to claim 1, characterized in that: The insulating structure (200) is coated on the first pole tab free end (132).

3. The single cell (100) according to claim 2, characterized in that: The insulating structure (200) comprises an insulating tape (201), and the insulating tape (201) is bonded to the free end (132) of the first pole tab.

4. The single cell (100) according to claim 3, characterized in that: The peel strength of the insulating tape (201) is 9 to 18 N / mm.

5. The single cell (100) according to claim 3, characterized in that: The first pole tab free end (132) comprises a stacking fault region (133), and the insulating tape (201) covers the stacking fault region (133).

6. The single cell (100) according to claim 3, characterized in that: One end (210) of the insulating tape (201) is bonded to a side of the first pole lug free end (132) close to the first terminal (140), and the other end (220) of the insulating tape (201) is bonded to a side of the first pole lug (131) away from the first terminal (140) and close to the root of the first pole lug (131).

7. The single cell (100) according to claim 3, characterized in that: The connection area between the first pole lug (131) and the first terminal (140) is a connection zone, and on the connection surface between the first pole lug (131) and the first terminal (140), the orthographic projection of the connection zone is within the orthographic projection of the insulating tape (201).

8. The single cell (100) according to claim 3, characterized in that: In a direction perpendicular to the extension direction of the first pole lug (131), a width D1 of the insulating tape (200) is greater than a width D2 of the first pole lug (131).

9. The single cell (100) according to claim 1, characterized in that: The first insulating support (160) comprises a first tab folding structure (170).

10. The single cell (100) according to claim 9, characterized in that: The first pole tab folding structure (170) comprises a first protrusion (171), wherein the first protrusion (171) extends from a side of the first insulating support (160) away from the first pole tab free end (132) to a side close to the first pole tab free end (132).

11. A battery, characterized in that: A single cell (100) comprising any one of claims 1 to 10.

12. An electrical device, characterized in that: A single cell (100) comprising any one of claims 1 to 10.

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