Single battery and electric equipment

Abstract

The utility model relates to the technical field of lithium ion batteries, in particular to a single battery and electric equipment. Each single battery comprises a battery cover plate, a pole group and a pole lug; the battery cover plate comprises a pole and a connecting piece; the battery cover plate has a length direction, and the connecting piece comprises a pole connecting part and a tab connecting part which are connected with each other in the length direction; the pole connecting part is provided with a welding hole for welding the pole, and the tab connecting part comprises a tab welding surface opposite to the side where the pole group is located; the pole is welded with the hole wall of the welding hole of the pole connecting part, and the tab is bent towards the tab welding surface and is welded with the tab welding surface. According to the single battery and the electric equipment, the problems that when the tabs of the existing lithium ion battery are connected with the output electrode of the battery cover plate, the bent tabs occupy a relatively large space, and the space utilization rate is relatively low are solved.

Description

Single-cell batteries and electrical equipment Technical Field

[0001] This application relates to the field of lithium-ion battery technology, and in particular to a single cell battery and an electrical device thereof. Background Technology

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in the field of electric vehicles. The cover plate of a lithium-ion battery is an important component of a lithium-ion power battery. It not only ensures the safety and reliability of the lithium-ion battery, but also facilitates the connection between the internal chemical system of the lithium-ion battery and the external module.

[0003] However, in existing lithium-ion batteries, when the tabs are connected to the output terminals of the battery cover (e.g., the terminal posts), the tabs require a large bending space to connect to the bottom surface of the output terminal (the bottom surface facing the electrode assembly). However, this connection method results in the tabs taking up a lot of space due to bending, and the space utilization rate is low. Summary of the Invention

[0004] The purpose of this application is to provide a single-cell battery and an electrical device, thereby solving the problem that when the tabs of existing lithium-ion batteries are connected to the output terminals of the battery cover, the tabs are bent and occupy a large amount of space, resulting in low space utilization.

[0005] According to a first aspect of this application, a single-cell battery is provided, the single-cell battery including a battery cover, an electrode assembly, and tabs; the battery cover includes a terminal post and a connector; the battery cover has a length direction, the connector includes a terminal post connecting portion and a tab connecting portion connected to each other in the length direction; the terminal post connecting portion is provided with a welding hole for welding the terminal post, the tab connecting portion includes a tab welding surface facing away from the side where the electrode assembly is located; the terminal post is welded to the wall of the welding hole of the terminal post connecting portion, and the tab is bent toward the tab welding surface and welded to the tab welding surface.

[0006] In any of the above technical solutions, the electrode post further includes a first stepped portion and a second stepped portion connected to each other; the cross-sectional area of ​​the second stepped portion is smaller than the cross-sectional area of ​​the first stepped portion; the battery cover plate also includes a cover plate body; the cover plate body is provided with a through hole for the second stepped portion to pass through, the second stepped portion passes through the through hole of the cover plate body and is welded to the wall of the welding hole of the electrode post connection portion; the cover plate body is positioned between the first stepped portion and the electrode post connection portion, and the electrode tab is bent between the cover plate body and the electrode tab connection portion.

[0007] In any of the above technical solutions, the battery cover further includes a sealing ring; the sealing ring includes a vertical rib and an outer ring disposed along the outer edge of the vertical rib; the vertical rib is sleeved on the second step portion, the vertical rib is disposed between the second step portion and the cover body, and the outer ring is press-fitted between the cover body and the terminal connection portion.

[0008] In any of the above technical solutions, the sealing ring further satisfies: (H-H1) / H=0.25~0.45; where H is the thickness of the outer ring before pressing, and H1 is the thickness of the outer ring after pressing.

[0009] In any of the above technical solutions, the battery cover further includes a first plastic part, which is sleeved on the terminal post connection portion and disposed between the cover body and the electrode tab connection portion; the electrode tab is bent between the first plastic part and the electrode tab connection portion.

[0010] In any of the above technical solutions, the pole connecting portion further includes a first plate and a second plate connected to each other, the first plate protruding from the second plate toward the side where the first step portion is located, and the cross-sectional area of ​​the first plate is smaller than the cross-sectional area of ​​the second plate; the cover plate body includes a main body and a reinforcing part connected to each other, the reinforcing part protruding from the main body toward the side opposite to the first step portion; the cross-sectional area of ​​the through hole provided in the main body is smaller than the cross-sectional area of ​​the through hole provided in the reinforcing part; the outer ring is press-fitted between the main body and the first plate; the first plastic part includes an insulating part, a vertical rib, and a body part connected in sequence; the insulating part extends toward the side where the second step portion is located to be disposed between the main body and the first plate, the vertical rib is disposed between the reinforcing part and the first plate, the body part extends along the length direction, and the surface formed at the connection between the first plate and the second plate is in contact with the body part; the electrode connecting portion is connected to the second plate, and a welding gap for accommodating the electrode is formed between the electrode connecting portion and the body part.

[0011] In any of the above technical solutions, the battery cover further includes a second plastic part, the second plastic part including a side wall and a bottom wall, the first step portion being disposed within the installation space enclosed by the side wall and the bottom wall, the bottom wall being provided with a through hole for the second step portion to pass through; the side of the first step portion away from the second step portion is exposed to the outside of the second plastic part.

[0012] In any of the above technical solutions, the cross-sections of the first step portion and the second step portion are both elliptical or waist-shaped.

[0013] In any of the above technical solutions, the electrode post is further disposed in the middle of the battery cover plate; the single battery cell includes a casing and two battery cover plates, and the two cover plates are respectively connected to the openings at both ends of the casing.

[0014] According to a second aspect of this application, an electrical device is provided, including a single battery cell as described above.

[0015] The single-cell battery of this application includes a battery cover, an electrode assembly, and tabs. The battery cover includes a terminal post and a connector; the battery cover has a length direction, and the connector includes a terminal post connecting portion and a tab connecting portion connected to each other in the length direction; the terminal post connecting portion has a welding hole for welding the terminal post, and the tab connecting portion includes a tab welding surface facing away from the electrode assembly; the terminal post is welded to the wall of the welding hole of the terminal post connecting portion, and the tab is bent toward the tab welding surface and welded to the tab welding surface.

[0016] Based on the above technical features, the beneficial effects of this application are as follows:

[0017] The connector in this application comprises two parts connected to each other along its length: a pole post connector and a tab connector. The pole post and the welding hole of the pole post connector are welded together to achieve a weld seal. The tab bends towards the tab welding surface of the tab connector and is welded to the tab welding surface to achieve an electrical connection. In this application, the tab can bypass the tab connector and be welded to the side of the tab connector opposite to the electrode assembly. Compared to existing technologies, this reduces the space occupied by the tab bending and improves space utilization.

[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 shows a schematic diagram of the overall structure of a single battery cell according to an embodiment of this application;

[0021] Figure 2 shows a top view of Figure 1;

[0022] Figure 3 shows a partially enlarged schematic diagram of the AA cross-sectional view in Figure 2;

[0023] Figure 4 shows a partially enlarged schematic diagram of the BB cross-sectional view in Figure 2;

[0024] Figure 5 shows a partially enlarged schematic diagram of the CC cross-sectional view of Figure 2;

[0025] Figure 6 shows a partial structural schematic diagram of Figure 1;

[0026] Figure 7 shows an assembly diagram of the electrode tabs and connectors according to an embodiment of this application;

[0027] Figure 8 shows a schematic diagram of the overall structure of the connector according to an embodiment of this application;

[0028] Figure 9 shows a cross-sectional view of Figure 8.

[0029] Icons: 100-Pole post; 110-First step; 120-Second step; 200-Sealing ring; 210-Vertical rib; 220-Outer ring; 300-Cover plate body; 310-Main body; 320-Reinforcing part; 400-Second plastic part; 410-Bottom wall; 420-Side wall; 500-Connector; 510-Pole post connection; 511-First plate; 512-Second plate; 520-Pole tab connection; 600-First plastic part; 610-Main body; 620-Insulation part; 630-Vertical rib; 700-Pole tab; 800-Pole assembly; 900-Outer shell. Detailed Implementation

[0030] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0031] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0032] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0033] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0034] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0035] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0036] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0037] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0038] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0039] Prior to this application, in existing lithium-ion batteries, when the tab is connected to the output electrode of the battery cover (e.g., the terminal post), the tab requires a large bending space to connect to the bottom surface of the output electrode (the bottom surface facing the electrode assembly). However, this connection method results in the tab taking up a large amount of space due to bending, and the space utilization rate is low.

[0040] In view of this, the first aspect of this application provides a single-cell battery, thereby solving the aforementioned technical problems existing in conventional lithium-ion batteries. The single-cell battery according to some embodiments of this application is described below with reference to Figures 1 to 9.

[0041] As shown in Figures 4, 5, 6, 7, 8, and 9, the single-cell battery of this application includes a battery cover, an electrode assembly 800, and tabs 700. The battery cover includes a terminal post 100 and a connector 500. The battery cover has a length direction, and the connector 500 includes a terminal post connecting portion 510 and a tab connecting portion 520 connected to each other in the length direction. The terminal post connecting portion 510 is provided with a welding hole for welding the terminal post 100, and the tab connecting portion 520 includes a tab welding surface facing away from the electrode assembly 800. The terminal post 100 is welded to the wall of the welding hole in the terminal post connecting portion 510, and the tab 700 is bent toward the tab welding surface and welded to the tab welding surface.

[0042] In other words, the connector 500 provided in this application includes two parts connected to each other in the length direction, namely the pole post connector 510 and the tab connector 520. The pole post 100 is welded to the wall of the welding hole in the pole post connector 510 to achieve a weld seal. The tab 700 bends towards the tab welding surface of the tab connector 520 and is welded to the tab welding surface to achieve an electrical connection. When the tab 700 of this application is connected, it can bypass the tab connector 520 and be welded to the side of the tab connector 520 opposite to the pole assembly 800. Compared with the prior art, this reduces the space occupied by the tab bending and improves space utilization.

[0043] Further, in the embodiments of this application, as shown in Figures 3 and 4, the terminal post 100 includes a first stepped portion 110 and a second stepped portion 120 connected to each other, the cross-sectional area of ​​the second stepped portion 120 being smaller than the cross-sectional area of ​​the first stepped portion 110. Additionally, the battery cover of this application also includes a cover body 300 (e.g., a plain aluminum plate), the cover body 300 having a through hole through which the second stepped portion 120 passes. The second stepped portion 120 passes through the through hole of the cover body 300 and is welded to the wall of the welding hole of the terminal post connecting portion 510. The cover body 300 is positioned between the first stepped portion 110 and the terminal post connecting portion 510, and the tab 700 is bent between the cover body 300 and the tab connecting portion 520.

[0044] In other words, this application uses the electrode post 100 and the connector 500 to weld together with the cover plate body 300 to form a battery cover plate, eliminating the riveting block in the prior art, that is, eliminating the riveting method in the prior art. This application not only simplifies the process, but also has a better assembly effect. More importantly, it will not cause the battery performance to be damaged by riveting vibration.

[0045] In the embodiments of this application, preferably, there is a gap between the bottom surface of the second step portion 120 and the bottom surface of the welding hole of the pole post connection portion 510, so as to effectively prevent solder from overflowing.

[0046] Furthermore, this application, by eliminating the riveting block, replaces the existing circular terminal post with an elliptical or waist-shaped terminal post 100. This maximizes the length of the terminal post 100 in the battery cover, making its cross-sectional area larger than that of a circle. Thus, given the limited width of the battery cover, the current-carrying area of ​​the terminal post 100 is increased, and the current-carrying capacity is improved. This allows the battery cover with the aforementioned terminal post 100 to meet the increasingly higher capacity and faster charging speed requirements of batteries, while reducing the width of the terminal post 100 in the battery cover, enabling the battery cover to be used in more applications.

[0047] In the embodiments of this application, when the cross-section of the pole post 100 is elliptical, the major axis of the ellipse extends along the length direction of the cover plate body 300, and the minor axis extends along the width direction of the cover plate body 300. Therefore, the actual flow area that the pole post 100 with an elliptical cross-section can handle is maximized by utilizing the distance along the length direction of the cover plate body 300, and it also helps the pole post 100 extend along the length direction of the cover plate body 300, increasing the flow area of ​​the pole post 100. When the cross-section of the pole post 100 is waist-shaped (racetrack-shaped), the length of the waist extends along the length direction of the cover plate body 300, and the width of the waist extends along the width direction of the cover plate body 300.

[0048] Furthermore, to meet the assembly and insulation performance requirements of the battery cover, and to prevent the risk of air leakage due to poor welding between the terminal post 100 and the connector 500, this application also provides a sealing ring 200. As shown in Figures 3 and 4, the sealing ring 200 includes a vertical rib 210 and an outer ring 220 disposed along the outer edge of the vertical rib 210. The vertical rib 210 is sleeved on the second step portion 120 and disposed between the second step portion 120 and the cover body 300, and the outer ring 220 is press-fitted between the cover body 300 and the terminal post connecting portion 510.

[0049] In the embodiments of this application, preferably, the sealing ring 200 satisfies: (H-H1) / H=0.25~0.45. Wherein, H is the thickness of the outer ring 220 before pressing, and H1 is the thickness of the outer ring 220 after pressing, so as to ensure the sealing performance of the battery cover.

[0050] Furthermore, to meet the assembly and insulation requirements of the battery cover, as shown in Figures 3 and 4, the battery cover of this application also includes a first plastic part 600. The first plastic part 600 is sleeved on the terminal post connection portion 510 and disposed between the cover body 300 and the terminal tab connection portion 520. The terminal tab 700 of this application can be bent between the first plastic part 600 and the terminal tab connection portion 520.

[0051] Specifically, as shown in Figures 3, 4, 8 and 9, the pole connection portion 510 includes a first plate 511 and a second plate 512 connected to each other. The first plate 511 protrudes from the second plate 512 toward the side where the first step portion 110 is located, and the cross-sectional area of ​​the first plate 511 is smaller than the cross-sectional area of ​​the second plate 512.

[0052] The cover body 300 includes a main body 310 and a reinforcing part 320 connected to each other. The reinforcing part 320 protrudes from the main body 310 toward the side opposite to the first step 110. The cross-sectional area of ​​the through hole provided in the main body 310 is smaller than the cross-sectional area of ​​the through hole provided in the reinforcing part 320. The outer ring 220 is press-fitted between the main body 310 and the first plate 511. The outer edge of the reinforcing part 320 is inserted into the casing 900 of the single battery cell.

[0053] The first plastic part 600 includes an insulating portion 620, a vertical rib 630, and a body portion 610 connected sequentially from top to bottom. The insulating portion 620 extends towards the side where the second stepped portion 120 is located, and is disposed between the body portion 310 and the first plate 511. The vertical rib 630 is disposed between the reinforcing portion 320 and the first plate 511. The body portion 610 extends along its length, and the surface formed at the connection between the first plate 511 and the second plate 512 is in contact with the body portion 610. As shown in Figures 4, 8, and 9, the tab connecting portion 520 is connected to the second plate 512, and a welding gap is formed between the tab connecting portion 520 and the body portion 610 to accommodate the tab 700.

[0054] As shown in Figures 4, 8, and 9, the first plastic part 600 is positioned between the cover body 300 and the connector 500, providing accurate positioning and installation space for the cover body 300, the first plastic part 600, and the connector 500. This ensures the connection accuracy between the cover body 300, the first plastic part 600, and the connector 500, thereby improving the assembly quality and stability of the entire battery cover. Furthermore, the surface formed at the connection between the first plate 511 and the second plate 512 fits snugly against the body portion 610, facilitating the positioning of the cover body 300, the first plastic part 600, and the connector 500. It also creates a welding gap between the tab connection portion 520 and the body portion 610 to accommodate the tab 700, allowing the tab 700 to be bent and welded.

[0055] Furthermore, in order to meet the assembly and insulation performance requirements of the battery cover, as shown in Figures 3 and 4, the battery cover of this application also includes a second plastic part 400. The second plastic part 400 includes a side wall 420 and a bottom wall 410. A first stepped portion 110 is disposed within the mounting space enclosed by the side wall 420 and the bottom wall 410. The bottom wall 410 is provided with a through hole for the second stepped portion 120 to pass through. The side of the first stepped portion 110 away from the second stepped portion 120 is exposed on the outside of the second plastic part 400.

[0056] In summary, the connector provided in this application includes two parts connected to each other in the longitudinal direction, namely, the terminal post connection portion 510 and the tab connection portion 520. The terminal post 100 is welded to the wall of the welding hole of the terminal post connection portion 510 to achieve a weld seal. This weld seal connects the first plastic part 600, the second plastic part 400, the cover plate body 300, and the sealing ring 200 to form the battery cover. The tab 700 is bent towards the tab welding surface of the tab connection portion 520 and welded to it to achieve an electrical connection. When the tab (700) of this application is connected, it can bypass the tab connection portion 520, bending to the welding gap between the first plastic part 600 and the tab connection portion 520, and welding to the side of the tab connection portion 520 opposite to the electrode assembly 800. Compared with the prior art, this reduces the space occupied by the tab bending and improves space utilization.

[0057] In addition, the electrode post 100 of this application can be a copper-aluminum composite electrode post. The ratio of copper and aluminum in the copper-aluminum composite electrode post can be adjusted according to the needs (copper and aluminum are connected in layers), which makes it convenient for the copper-aluminum composite electrode post to be thickened in one go.

[0058] Furthermore, it is worth mentioning that, as shown in Figure 1, the terminal post 100 is located in the middle of the battery cover. The single battery cell includes a housing 900 and two battery covers, which are connected to the openings at both ends of the housing 900 (the lower battery cover in Figure 1 is obscured due to viewing angle). In other words, only one terminal post 100 is provided at one end of the single battery cell, and the terminal post 100 is located in the middle of the battery cover. This facilitates the extension of the waist-shaped terminal post 100 along the length of the battery cover, further increasing the current-carrying area of ​​the terminal post 100 and improving its current-carrying capacity.

[0059] According to a second aspect of this application, an electrical device is provided, including a single battery cell as described above.

[0060] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in this application, or make equivalent substitutions for some of the technical features. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application.

Claims

1. A single-cell battery, characterized in that, The single battery cell includes a battery cover, an electrode assembly, and tabs; the battery cover includes a terminal post and a connector; the battery cover has a length direction, and the connector includes a terminal post connecting portion and a tab connecting portion connected to each other in the length direction; the terminal post connecting portion is provided with a welding hole for welding the terminal post, and the tab connecting portion includes a tab welding surface facing away from the side where the electrode assembly is located; the terminal post is welded to the wall of the welding hole of the terminal post connecting portion, and the tab is bent toward the tab welding surface and welded to the tab welding surface.

2. The single-cell battery according to claim 1, characterized in that, The terminal post includes a first stepped portion and a second stepped portion connected to each other; the cross-sectional area of ​​the second stepped portion is smaller than that of the first stepped portion; the battery cover also includes a cover body; the cover body is provided with a through hole for the second stepped portion to pass through, the second stepped portion passes through the through hole of the cover body and is welded to the wall of the welding hole of the terminal post connection portion; the cover body is positioned between the first stepped portion and the terminal post connection portion, and the tab is bent between the cover body and the tab connection portion.

3. The single-cell battery according to claim 2, characterized in that, The battery cover also includes a sealing ring; the sealing ring includes a vertical rib and an outer ring disposed along the outer edge of the vertical rib; the vertical rib is sleeved on the second step portion, the vertical rib is disposed between the second step portion and the cover body, and the outer ring is press-fitted between the cover body and the terminal connection portion.

4. The single-cell battery according to claim 3, characterized in that, The sealing ring satisfies: (H-H1) / H=0.25~0.45; where H is the thickness of the outer ring before pressing, and H1 is the thickness of the outer ring after pressing.

5. The single-cell battery according to claim 3, characterized in that, The battery cover also includes a first plastic part, which is sleeved on the terminal post connection portion and disposed between the cover body and the electrode tab connection portion; the electrode tab is bent between the first plastic part and the electrode tab connection portion.

6. The single-cell battery according to claim 5, characterized in that, The pole connecting portion includes a first plate and a second plate connected to each other. The first plate protrudes from the second plate toward the side where the first step portion is located, and the cross-sectional area of ​​the first plate is smaller than that of the second plate. The cover plate body includes a main body and a reinforcing part connected to each other. The reinforcing part protrudes from the main body toward the side opposite to the first step portion. The cross-sectional area of ​​the through hole provided in the main body is smaller than that of the through hole provided in the reinforcing part. The outer ring is press-fitted between the main body and the first plate. The first plastic part includes an insulating part, a vertical rib, and a body part connected in sequence. The insulating part extends toward the side where the second step portion is located to be disposed between the main body and the first plate. The vertical rib is disposed between the reinforcing part and the first plate. The body part extends along the length direction, and the surface formed at the connection between the first plate and the second plate fits against the body part. The electrode tab connecting portion is connected to the second plate, and a welding gap for accommodating the electrode tab is formed between the electrode tab connecting portion and the body part.

7. The single-cell battery according to any one of claims 2-6, characterized in that, The battery cover also includes a second plastic part, which includes a side wall and a bottom wall. The first stepped portion is disposed within the installation space enclosed by the side wall and the bottom wall. The bottom wall is provided with a through hole for the second stepped portion to pass through. The side of the first stepped portion away from the second stepped portion is exposed to the outside of the second plastic part.

8. The single-cell battery according to any one of claims 2-6, characterized in that, The cross-sections of the first step and the second step are both elliptical or waist-shaped.

9. The single-cell battery according to claim 8, characterized in that, The terminal post is located in the middle of the battery cover plate; the single battery cell includes a housing and two battery cover plates, and the two cover plates are respectively connected to the openings at both ends of the housing.

10. An electrical appliance, characterized in that, Includes the single-cell battery as described in any one of claims 1-9.

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