Battery cover plate and single battery

Abstract

The utility model relates to the technical field of lithium ion batteries, in particular to a battery cover plate and a single battery. The battery cover plate comprises a pole, a cover plate body, a connecting piece and a sealing ring, the pole comprises a first step part, a second step part, a third step part and a fourth step part of which the cross sectional areas are sequentially reduced; the connecting piece comprises a welding part and a bearing part which are connected with each other, and the welding part protrudes from the middle of the bearing part to the first step part; the pole penetrates through the through hole of the cover plate body, the fourth step part is welded with the hole wall of the welding hole of the connecting piece, and the cover plate body is limited between the first step part and the bearing part; the sealing ring comprises an inner ring, a vertical rib and an outer ring which are connected in sequence; the vertical rib is sleeved on the welding part; the inner ring is pressed between the second step part and the welding part; and the outer ring is pressed between the bearing part and the cover plate body. According to the battery cover plate and the single battery provided by the invention, the problems that the battery performance is easily damaged by riveting vibration and the sealing performance is relatively poor in the assembly mode of the existing battery cover plate are solved.

Description

Technical Field

[0001] This application relates to the field of lithium-ion battery technology, and in particular to a battery cover and a single battery cell. 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] The existing battery cover includes a riveting block, an upper plastic, a cover body, and a lower plastic. The terminal passes through the riveting block, the upper plastic, the cover body, and the lower plastic in sequence. The terminal is riveted to the riveting block. However, the above assembly method of the cover makes it easy for riveting vibration to damage the battery performance, and the processing technology is complicated and the sealing performance is poor. Utility Model Content

[0004] The purpose of this application is to provide a battery cover and a single battery cell, thereby solving the problems of existing battery cover assembly methods, riveting vibration that easily damages battery performance, and poor sealing.

[0005] This application provides a battery cover, which includes a terminal post, a cover body, a connector, and a sealing ring. The terminal post includes a first step, a second step, a third step, and a fourth step with sequentially decreasing cross-sectional areas. The connector includes a welded portion and a support portion connected to each other. The welded portion is disposed in the middle of the support portion and protrudes from the support portion toward the side where the first step is located. The welded portion has a welding hole for welding the fourth step. The second step, the third step, and the fourth step pass through... The cover plate body has a through hole, and the fourth step portion is welded to the wall of the welding hole of the connector. The cover plate body is positioned between the first step portion and the bearing portion. The sealing ring includes an inner ring, a vertical rib, and an outer ring connected in sequence. The vertical rib is sleeved on the welding portion and is disposed between the welding portion and the cover plate body. The inner ring extends from the vertical rib to the side where the pole post is located and is press-fitted between the second step portion and the welding portion. The outer ring extends from the vertical rib to the side opposite to the pole post and is press-fitted between the bearing portion and the cover plate body.

[0006] In any of the above technical solutions, the cross-sections of the first step portion, the second step portion, the third step portion, and the fourth step portion are all elliptical or waist-shaped.

[0007] In any of the above technical solutions, the connecting surface formed at the junction of the third step and the fourth step is in contact with the welded part; and / or, the surface of the welded part that is in contact with the connecting surface is defined as a sealing surface, the surface of the welded part opposite to the sealing surface is defined as a first plane, and a gap is provided between the fourth step and the first plane; the weld penetration depth of the fourth step and the weld hole is the thickness of the fourth step.

[0008] In any of the above technical solutions, the battery cover further includes a first plastic part; the first plastic part is sleeved on the supporting part and disposed between the cover body and the supporting part; the cover body includes a main body and a reinforcing part connected to each other, the reinforcing part protruding from the main body to the side opposite to the first step; 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 vertical rib is disposed between the welding part and the main body, and the outer ring is press-fitted between the supporting part and the main body; and / or, the outer edge of the first plastic part is provided with an annular outer groove that mates with the reinforcing part, and the inner edge of the first plastic part is provided with an annular inner groove that mates with the supporting part.

[0009] In any of the above technical solutions, further, the width of the outer ring is ≥1.1mm, and the width of the inner ring is ≥0.8mm; and / or, the width of the outer ring is greater than the width of the inner ring.

[0010] In any of the above technical solutions, the width of the vertical rib is ≥0.5mm.

[0011] In any of the above technical solutions, the sealing ring further satisfies: H1≥0.6mm, H≥0.8mm; and / or, (H-H1) / H=0.25~0.45; where H is the thickness of the inner ring and the outer ring before pressing, and H1 is the thickness of the inner ring and the outer ring after pressing.

[0012] In any of the above technical solutions, further, before the sealing ring is press-fitted, the distance between the inner ring and the third step portion is ≥0.5mm, and the distance between the outer ring and the first plastic part is ≥0.5mm.

[0013] 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 being exposed to the outside of the second plastic part; the bottom wall being disposed between the first step portion and the cover body, and the two sides of the vertical rib extending to the bottom wall and the supporting portion respectively.

[0014] According to a second aspect of this application, a single-cell battery is provided, including a battery cover as described above; the terminal post is disposed in the middle of the battery cover; the single-cell battery includes a housing and two battery covers, the two covers being respectively connected to openings at both ends of the housing.

[0015] The battery cover of this application includes a terminal post, a cover body, a connector, and a sealing ring. The terminal post includes a first step, a second step, a third step, and a fourth step with sequentially decreasing cross-sectional areas. The connector includes a welded portion and a support portion connected to each other. The welded portion protrudes from the center of the support portion toward the first step. The welded portion has a welding hole for welding the fourth step. The second, third, and fourth step portions pass through a through hole in the cover body. The fourth step is welded to the wall of the welding hole in the connector. The cover body is positioned between the first step and the support portion. The sealing ring includes an inner ring, a vertical rib, and an outer ring connected in sequence. The vertical rib is fitted onto the welded portion and positioned between the welded portion and the cover body. The inner ring extends from the vertical rib toward the side where the terminal post is located and is press-fitted between the second step and the welded portion. The outer ring extends from the vertical rib toward the side opposite to the terminal post and is press-fitted between the support portion and the cover body.

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

[0017] This application uses welding of the terminal post and connector to form a battery cover with the cover plate body, eliminating the riveting blocks and riveting method used in the prior art. This not only simplifies the process but also improves the assembly effect. Importantly, it avoids the risk of battery performance damage caused by riveting vibration. Furthermore, the outer ring of this application achieves a seal between the connector (supporting part) and the cover plate body, while the inner ring achieves a seal between the connector (welded part) and the terminal post (second step part). In other words, a single sealing ring achieves seals at two points. The vertical rib in the middle fills the gap between the cover plate body and the connector (welded part), further strengthening the sealing function and eliminating the possibility of air leakage from the inside and outside of the individual battery cells.

[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 A schematic diagram of the overall structure of a single battery cell according to an embodiment of this application is shown;

[0021] Figure 2 Show Figure 1 Top view;

[0022] Figure 3 Show Figure 2 A partially enlarged schematic diagram of the AA cross-sectional view;

[0023] Figure 4 Show Figure 2 A partially enlarged schematic diagram of the BB cross-section;

[0024] Figure 5 Show Figure 3 A partially enlarged schematic diagram;

[0025] Figure 6 Show Figure 3 A partially enlarged schematic diagram;

[0026] Figure 7 A schematic diagram of the overall structure of the pole post according to an embodiment of this application is shown;

[0027] Figure 8 Show Figure 7 A sectional view;

[0028] Figure 9 A schematic diagram showing the overall structure of the sealing ring according to an embodiment of this application;

[0029] Figure 10 Show Figure 9 A sectional view;

[0030] Figure 11 A schematic diagram of the overall structure of the connector according to an embodiment of this application is shown;

[0031] Figure 12 Show Figure 11 A sectional view.

[0032] Icons: 100-Pole post; 110-First step; 120-Second step; 130-Third step; 140-Fourth step; 200-Sealing ring; 210-Outer ring; 220-Inner ring; 230-Vertical rib; 300-Cover plate body; 310-Main body; 320-Reinforcing part; 400-Second plastic part; 410-Bottom wall; 420-Side wall; 500-Connector; 510-Welding part; 520-Bearing part; 600-First plastic part; 610-Main body; 620-Insulating part; 630-Vertical rib; 700-Pole tab; 800-Pole assembly; 900-Outer shell. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Prior to this application, existing battery covers included a riveting block, an upper plastic, a cover body, and a lower plastic. The terminals passed through the riveting block, the upper plastic, the cover body, and the lower plastic in sequence, with the terminals riveted to the riveting block. However, the assembly method of the above-mentioned cover made it easy for riveting vibrations to damage the battery performance, and the processing technology was complex and the sealing performance was poor.

[0043] In view of this, the first aspect of this application provides a battery cover, thereby solving the aforementioned technical problems of existing battery covers. Referring below... Figures 1 to 12 This application describes a battery cover according to some embodiments.

[0044] like Figure 3 , Figure 4 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 As shown, the battery cover of this application includes a terminal post 100, a cover body 300 (e.g., a plain aluminum plate), a connector 500, and a sealing ring 200. The terminal post 100 includes a first stepped portion 110, a second stepped portion 120, a third stepped portion 130, and a fourth stepped portion 140 with sequentially decreasing cross-sectional areas. The connector 500 includes a welded portion 510 and a supporting portion 520 connected to each other. The welded portion 510 is located in the middle of the supporting portion 520 and protrudes from the supporting portion 520 towards the side where the first stepped portion 110 is located. The welded portion 510 has a welding hole for welding the fourth stepped portion 140. The second stepped portion 120, the third stepped portion 130, and the fourth stepped portion 140 pass through the through hole of the cover body 300. The fourth stepped portion 140 is welded to the wall of the welding hole of the connector 500. The cover body 300 is positioned between the first stepped portion 110 and the supporting portion 520. The sealing ring 200 includes an inner ring 220, a vertical rib 230, and an outer ring 210 connected in sequence; the vertical rib 230 is sleeved on the welding part 510 and is disposed between the welding part 510 and the cover plate body 300; the inner ring 220 extends from the vertical rib 230 toward the side where the pole post is located and is press-fitted between the second step part 120 and the welding part 510; the outer ring 210 extends from the vertical rib 230 toward the side opposite to the pole post and is press-fitted between the bearing part 520 and the cover plate body 300.

[0045] In other words, this application uses welding of the terminal post 100 and the connector 500 to form a battery cover with the cover body 300, eliminating the riveting blocks and riveting methods used in the prior art. This application not only simplifies the process but also improves the assembly effect. Importantly, it avoids the risk of battery performance damage caused by riveting vibration. Furthermore, the outer ring 210 of this application achieves a seal between the connector 500 (supporting part 520) and the cover body 300, while the inner ring 220 achieves a seal between the connector 500 (welded part 510) and the terminal post 100 (second step part 120). In other words, a single sealing ring 200 achieves seals at two locations. The vertical rib 230 in the middle fills the gap between the cover body 300 and the connector 500 (welded part 510), further strengthening the sealing function and eliminating the possibility of air leakage from the inside and outside of the individual battery cells.

[0046] In addition, it is worth mentioning that, Figure 7 and Figure 8 As shown, the cross-sections of the first step portion 110, the second step portion 120, the third step portion 130, and the fourth step portion 140 of the pole post 100 of this application are all elliptical or waist-shaped. Figure 7 and Figure 8The diagram illustrates that the cross-sections of the first step portion 110, the second step portion 120, the third step portion 130, and the fourth step portion 140 are waist-shaped. In other words, this application 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, improving its current-carrying capacity. 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 elliptical pole post 100 can handle is maximized by utilizing the width 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] In addition, in the embodiments of this application, the first step portion 110, the second step portion 120, the third step portion 130 and the fourth step portion 140 with gradually decreasing cross-sectional areas are designed in a stepped structure that facilitates the tight connection and positioning between different components.

[0049] For example, such as Figure 3 and Figure 4 As shown, the fourth step portion 140 is electrically connected to the wall of the welding hole of the connector 500 (welding portion 510) through welding. The surface formed at the connection between the third step portion 130 and the fourth step portion 140 is in contact with the connector 500 (welding portion 510). This design not only ensures the connection strength between the fourth step portion 140 and the connector 500 through welding, but also increases the contact area by the contact surface, improving the stability and reliability of the connection, thereby improving the strength and stability of the entire battery cover structure. In this example, the fourth step portion 140 is welded to the wall of the welding hole of the connector 500 (welding portion 510), and the welding melt depth is preferably the thickness of the fourth step portion 140.

[0050] In this embodiment, see continue to refer to Figure 3The connecting surface formed at the junction of the third step portion 130 and the fourth step portion 140 is in contact with the welded portion 510. If the surface of the welded portion 510 that is in contact with the connecting surface is defined as the sealing surface, and the plane containing the surface of the welded portion 510 opposite to the sealing surface is defined as the first plane, then the distance between the fourth step portion 140 and the first plane is ≥0.15mm; the weld penetration depth between the fourth step portion 140 and the weld hole is equal to the thickness of the fourth step portion 140. In other words, the distance between the bottom surface of the fourth step portion 140 and the bottom surface of the welded portion 510 is ≥0.15mm, which effectively prevents solder overflow.

[0051] In this embodiment, as Figure 3 , Figure 11 and Figure 12 As shown, to facilitate the processing of the connector 500 and the ease of assembly with the tab 700, as well as the flow area, the connector 500 includes a welding part 510 with a central opening, which is an oblong columnar structure, and a support part 520 with a central opening, which is a rectangular columnar structure. The tab 700 of the single cell, which is led out from the electrode group 800, is welded to the bottom surface of the support part 520.

[0052] Furthermore, the battery cover of this application, in order to meet the requirements of battery cover assembly and insulation performance, such as... Figure 3 and Figure 4 As shown, the battery cover of this application also includes a first plastic part 600. The first plastic part 600 is sleeved on the support portion 520 and disposed between the cover body 300 and the support portion 520.

[0053] Specifically, the cover plate body 300 includes a main body portion 310 and a reinforcing portion 320 connected to each other. The reinforcing portion 320 protrudes from the main body portion 310 to the side opposite to the first step portion 110. The cross-sectional area of ​​the through hole provided in the main body portion 310 is smaller than the cross-sectional area of ​​the through hole provided in the reinforcing portion 320. The outer edge of the reinforcing portion 320 is inserted into the outer casing 900 of the single battery cell.

[0054] like Figure 3 and Figure 4 As shown, the outer edge of the first plastic part 600 is provided with an annular outer groove that mates with the reinforcing part 320, and the inner edge of the first plastic part 600 is provided with an annular inner groove that mates with the supporting part 520. Preferably, as shown... Figure 3 and Figure 4As shown, 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 inward (towards the terminal post 100) to insulate between the support portion 520 and the body portion 310. The annular inner groove formed by the vertical rib 630 and the insulating portion 620 mates with the support portion 520. The body portion 610 extends outward (away from the terminal post 100), with its extension length approaching that of the cover body 300. The annular outer groove formed by the vertical rib 630 and the body portion 610 mates with the annular limiting groove formed by the body portion 310 and the reinforcing portion 320. This configuration allows the annular outer and inner grooves of the first plastic part 600 to provide accurate positioning and installation space for the cover body 300, the first plastic part 600, and the connector 500, ensuring 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.

[0055] In this embodiment, based on this, such as Figure 3 As shown, the vertical rib 230 is disposed between the welding part 510 and the main body part 310, and the outer ring 210 is press-fitted between the bearing part 520 and the main body part 310.

[0056] In this embodiment, preferably, as follows: Figure 5 As shown, before pressing, the width W1 of the outer ring 210 is ≥ 1.1 mm, ensuring sufficient lateral contact area between the outer ring 210 and the main body 310 after compression, thus ensuring a sealing effect. The width W2 of the inner ring 220 is ≥ 0.8 mm, ensuring sufficient lateral contact area between the inner ring 220 and the second step 120 and the welded part 510 after compression, thus ensuring a sealing effect. Further, preferably, the width W1 of the outer ring 210 is greater than the width W2 of the inner ring 220. This arrangement, while ensuring sufficient contact area between the outer ring 210 and the inner ring 220, also creates a certain gap between the vertical rib 230 and the cover body before assembly. This prevents the sealing ring 200 from flowing inwards after the inner ring 220 is compressed during battery cover assembly; instead, it flows towards the outer ring 210, ensuring the flow effect of the sealing ring 200, guaranteeing its reliability, and preventing it from cracking and failing due to insufficient compression space.

[0057] In this embodiment, preferably, as follows: Figure 5 As shown, before pressing, the width W3 of the vertical rib 230 is ≥0.5mm to ensure the strength of the connection after assembly.

[0058] In this embodiment, preferably, as follows: Figure 5As shown, the sealing ring 200 satisfies: H1≥0.6mm, H≥0.8mm, (H-H1) / H=0.25~0.45. Wherein, H is the thickness of the inner ring 220 and the outer ring 210 before pressing, and H1 is the thickness of the inner ring 220 and the outer ring 210 after pressing, thus ensuring the sealing performance of the battery cover.

[0059] In this embodiment, preferably, as follows: Figure 6 As shown, before the sealing ring 200 is press-fitted, the gap distance G between the inner ring 220 and the third step portion 130 is ≥0.5 to prevent the sealing ring 200 from cracking and failing due to insufficient compression space. Before the sealing ring 200 is press-fitted, the gap distance G1 between the outer ring 210 and the first plastic part 600 is ≥0.5 to prevent the sealing ring 200 from cracking and failing due to insufficient compression space.

[0060] Furthermore, the battery cover of this application, in order to meet the requirements of battery cover assembly and insulation performance, such as... Figure 3 and Figure 4 As shown, the battery cover of this application also includes a second plastic part 400, which 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 outside the second plastic part 400. The bottom wall 410 is disposed between the first stepped portion 110 and the cover body 300, and the two sides of the vertical rib 230 extend to the bottom wall 410 and the supporting portion 520, respectively.

[0061] In addition, the electrode post 100 of this application can be a copper-aluminum composite electrode post (copper and aluminum are connected in layers). The ratio of copper and aluminum in the copper-aluminum composite electrode post can be adjusted according to the needs, which makes it convenient to thicken the copper-aluminum composite electrode post in one go.

[0062] A second aspect of this application provides a single-cell battery, which includes the battery cover as described above. For example... Figure 1 As shown, 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 respectively connected to the openings at both ends of the housing 900. Figure 1 (The lower middle battery cover is obscured due to viewing angle). In other words, only one terminal post 100 is provided at one end of each individual 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.

[0063] 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 battery cover, characterized in that, The battery cover includes a terminal post, a cover body, a connector, and a sealing ring; The pole post includes a first step portion, a second step portion, a third step portion, and a fourth step portion with successively decreasing cross-sectional areas; The connector includes a welded part and a load-bearing part that are connected to each other. The welding part is disposed in the middle of the bearing part, and the welding part protrudes from the bearing part toward the side where the first step part is located; The welding section is provided with welding holes for welding the fourth step section; The second step, the third step, and the fourth step pass through the through hole of the cover plate body. The fourth step is welded to the wall of the welding hole of the connector. The cover plate body is positioned between the first step and the bearing portion. The sealing ring includes an inner ring, a vertical rib, and an outer ring connected in sequence; the vertical rib is sleeved on the welding part and disposed between the welding part and the cover plate body; the inner ring extends from the vertical rib toward the side where the pole post is located and is press-fitted between the second step part and the welding part; the outer ring extends from the vertical rib toward the side opposite to the pole post and is press-fitted between the bearing part and the cover plate body.

2. The battery cover according to claim 1, characterized in that, The cross-sections of the first step portion, the second step portion, the third step portion, and the fourth step portion are all elliptical or waist-shaped.

3. The battery cover according to claim 1, characterized in that, The connecting surface formed at the junction of the third step and the fourth step is in contact with the welded part; And / or, the surface of the welded part that is in contact with the connecting surface is defined as the sealing surface, the surface of the welded part that is opposite to the sealing surface is defined as the first plane, and a gap is provided between the fourth step and the first plane; the weld penetration depth of the fourth step and the weld hole is the thickness of the fourth step.

4. The battery cover according to claim 3, characterized in that, The battery cover also includes a first plastic component; the first plastic component is sleeved on the supporting portion and disposed between the cover body and the supporting portion; The cover plate body includes a main body and a reinforcing part connected to each other. The reinforcing part protrudes from the main body towards the side opposite to the first step. 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 vertical rib is disposed between the welded part and the main body part, and the outer ring is press-fitted between the bearing part and the main body part; And / or, the outer edge of the first plastic part is provided with an annular outer groove that mates with the reinforcing part, and the inner edge of the first plastic part is provided with an annular inner groove that mates with the bearing part.

5. The battery cover according to claim 4, characterized in that, The width of the outer ring is ≥1.1mm, and the width of the inner ring is ≥0.8mm; And / or, the width of the outer ring is greater than the width of the inner ring.

6. The battery cover according to claim 4, characterized in that, The width of the vertical rib is ≥0.5mm.

7. The battery cover according to claim 4, characterized in that, The sealing ring satisfies: H1≥0.6mm, H≥0.8mm; And / or, (H-H1) / H = 0.25–0.45; Wherein, H is the thickness of the inner ring and the outer ring before pressing, and H1 is the thickness of the inner ring and the outer ring after pressing.

8. The battery cover according to claim 4, characterized in that, Before the sealing ring is press-fitted, the distance between the inner ring and the third step portion is ≥0.5mm, and the distance between the outer ring and the first plastic part is ≥0.5mm.

9. The battery cover according to any one of claims 1-8, 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. The bottom wall is disposed between the first step portion and the cover plate body, and the two sides of the vertical rib extend to the bottom wall and the bearing portion, respectively.

10. A single-cell battery, characterized in that, Includes the battery cover as described in any one of claims 1-9; The electrode post is located in the middle of the battery cover plate; The single battery cell includes a casing and two battery cover plates, which are respectively connected to the openings at both ends of the casing.

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