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. The single battery has a length direction and comprises two shells; each shell comprises a closed end and an open end which are opposite to each other in the length direction, the open ends of the shells are arranged in an open manner, closed end plates are formed at the closed ends of the shells, pole through holes for mounting poles are formed in the closed end plates, and the two open ends of the two shells are in butt joint with each other; the two shells are of an integrated stamping structure. According to the single battery and the electric equipment provided by the invention, the problems of relatively high process difficulty and relatively high cost due to the fact that the shell length of the existing blade battery is greater than or equal to 300mm and the shell is processed by adopting processes such as high-frequency welding or extrusion and the like are solved.

Description

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 new energy vehicles. In this sector, driving range and safety are key concerns for consumers. The improved energy density and enhanced safety performance of blade batteries have significantly improved the driving range and safety of new energy vehicles equipped with them, meeting consumers' demands for long driving range and high safety.

[0003] However, current blade batteries have casings that are ≥300mm in length, requiring high-frequency welding or extrusion processes to manufacture the casings, which is difficult and costly. Utility Model Content

[0004] The purpose of this application is to provide a single-cell battery and an electrical device, thereby solving the problem that existing blade batteries have a casing length of ≥300mm, which requires high-frequency welding or extrusion processes to process the casing, resulting in high manufacturing difficulty and cost.

[0005] The first aspect of this application provides a single-cell battery, the single-cell battery having a length direction, the single-cell battery including two housings; each housing includes a closed end and an open end opposite to each other in the length direction, the open end of the housing is openly disposed, the closed end of the housing is formed with a closed end plate, the closed end plate has an electrode through hole for electrode mounting, the two open ends of the two housings are connected to each other; both housings are integral stamping structures.

[0006] In any of the above technical solutions, the single cell further includes an electrode post, which includes a first step portion, a second step portion, and a third step portion connected in sequence; the cross-sectional area of ​​the first step portion and the third step portion is larger than the cross-sectional area of ​​the second step portion; the inner wall of the through hole of the electrode post cooperates with the second step portion, and the closed end plate is limited between the first step portion and the third step portion.

[0007] In any of the above technical solutions, the single battery cell further includes an electrode assembly, a tab, and a seal; the terminal post is provided with a through hole that extends through itself along the length direction, the through hole sequentially penetrating the first step portion, the second step portion, and the third step portion, and the seal is welded to the wall of the through hole of the terminal post; the tab is led out from the electrode assembly, the tab passes through the through hole of the terminal post, and is welded to the side of the seal facing the tab, and the side of the seal facing away from the tab is exposed to the terminal post.

[0008] In any of the above technical solutions, the single cell further includes a sealing ring; the sealing ring is sleeved on the second step portion and disposed between the second step portion and the closed end plate, and a portion of the sealing ring is press-fitted between the closed end plate and the third step portion.

[0009] In any of the above technical solutions, the sealing ring further includes a vertical rib and an outer ring connected to each other. The outer ring is disposed along the outer edge of the vertical rib. The vertical rib is sleeved on the second step portion and disposed between the second step portion and the closed end plate. The outer ring is press-fitted between the closed end plate and the third step portion.

[0010] In any of the above technical solutions, the single cell further includes a first plastic part, the first 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 first plastic part, and the two sides of the vertical rib extend to the bottom wall and the third step portion respectively.

[0011] In any of the above technical solutions, the two outer shells have the same structure.

[0012] In any of the above technical solutions, further, the two open ends of the two outer shells are welded to each other.

[0013] In any of the above technical solutions, the cross-sections of the first step portion, the second step portion, the third step portion, the through hole, and the seal are all waist-shaped or elliptical.

[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 of this application includes two housings, each housing including a closed end and an open end opposite to each other in the longitudinal direction. The open end of the housing is open, and the closed end of the housing is formed with a closed end plate. The closed end plate has a through hole for mounting the electrode post. The two open ends of the two housings are connected to each other. Both housings are integral stamping structures.

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

[0017] The single-cell battery of this application has a casing composed of two stamped outer shells joined together. Each stamped outer shell has one open end and the other closed end, but with through-holes for terminals and other components disposed on these through-holes. Compared to existing technologies, this application replaces the existing single casing with two stamped outer shells joined together. This design reduces the manufacturing difficulty and cost of each outer shell. Furthermore, the joining of the two outer shells is simpler and more convenient.

[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 the housing according to an embodiment of this application is shown;

[0021] Figure 2 Show Figure 1 Top view;

[0022] Figure 3 Show Figure 2 Schematic diagram of CC cross-section structure;

[0023] Figure 4 A schematic diagram of the overall structure of a single battery cell according to an embodiment of this application is shown;

[0024] Figure 5 Show Figure 4 Top view;

[0025] Figure 6 Show Figure 4 Top view;

[0026] Figure 7 Show Figure 6 A schematic diagram of the BB cross-sectional structure;

[0027] Figure 8 Show Figure 6 A schematic diagram of the AA cross-sectional structure.

[0028] Icons: 100-Pole post; 110-First step; 120-Second step; 130-Third step; 200-Sealing ring; 210-Vertical rib; 220-Outer ring; 300-Pole lug; 400-Pole assembly; 500-Outer shell; M-Closed end; N-Open end; 510-Closed end plate; 511-Pole post through hole; 600-Sealing element; 700-First plastic part; 710-Bottom wall; 720-Side wall; X-Length direction. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] 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.

[0032] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Prior to this application, current blade batteries, with casing lengths ≥300mm, require high-frequency welding or extrusion processes for casing fabrication, which are technically challenging and costly.

[0039] In view of this, the first aspect of this application provides a single-cell battery, thereby solving the above-mentioned technical problems existing in the existing blade battery.

[0040] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the single cell of this application includes two housings 500. Each housing 500 includes a closed end M and an open end N that are opposite each other in the length direction X. The open end N of the housing 500 is open. The closed end of the housing 500 is formed with a closed end plate 510. The closed end plate 510 has an electrode through hole 511 for mounting the electrode post 100. The two open ends N of the two housings 500 in the length direction X are connected to each other. Both housings 500 are integral stamping structures.

[0041] In other words, the entire casing of the single battery cell in this application is assembled from two stamped outer shells 500. Each stamped outer shell 500 has one open end and the other closed end, but it is partially provided with a terminal post through hole 511, and components such as the terminal post 100 are disposed on the terminal post through hole 511. Compared with the prior art, this application changes the existing entire casing to two stamped outer shells 500, which are joined together. This design reduces the manufacturing difficulty and cost of each outer shell 500. Moreover, the process of joining the two outer shells 500 together is simpler and more convenient.

[0042] In the embodiments of this application, preferably, the two outer shells 500 have identical structures, and their two open ends N are welded together. This arrangement, using identical outer shells 500, facilitates mold manufacturing and production processing, reduces production costs, and improves production efficiency. Simultaneously, the welding method is relatively simple, easily automating the process, which helps ensure consistent and stable welding quality, reduces errors and uncertainties caused by manual operation, and is suitable for large-scale industrial production.

[0043] In the embodiments of this application, such as Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the single-cell battery also includes an electrode post 100, which comprises a first stepped portion 110, a second stepped portion 120, and a third stepped portion 130 connected in sequence. The cross-sectional areas of the first stepped portion 110 and the third stepped portion 130 are both larger than the cross-sectional area of ​​the second stepped portion 120. The inner wall of the electrode post through-hole 511 on the closed end plate 510 mates with the second stepped portion 120, and the closed end plate 510 is positioned between the first stepped portion 110 and the third stepped portion 130. This configuration, where the cross-sectional areas of the first stepped portion 110 and the third stepped portion 130 are both larger than the second stepped portion 120, allows for precise positioning of this stepped structure with the electrode post through-hole 511 of the closed end plate 510. The second step portion 120 engages with the inner wall of the terminal through hole 511 of the closed end plate 510, and the closed end plate 510 is confined between the first step portion 110 and the third step portion 130, so that the terminal 100 will not shake or shift after installation, ensuring the stability of the connection between the terminal 100 and the closed end plate 510, thereby improving the stability of the overall battery structure.

[0044] Furthermore, to meet the assembly and insulation requirements of the individual battery cells, and to prevent the risk of leakage due to poor connection of the terminal post 100, the individual battery cell of this application also includes a sealing ring 200. The sealing ring 200 is sleeved on the second step portion 120 and disposed between the second step portion 120 and the closed end plate 510. A portion of the sealing ring 200 is press-fitted between the closed end plate 510 and the third step portion 130. Specifically, as shown... Figure 7 and Figure 8 As shown, the sealing ring 200 includes a vertical rib 210 and an outer ring 220 connected to each other. The outer ring 220 is 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 closed end plate 510. The outer ring 220 is press-fitted between the closed end plate 510 and the third step portion 130. With this arrangement, the vertical rib 210 provides insulation and sealing between the second step portion 120 and the closed end plate 510, and the outer ring 220 provides insulation and sealing between the closed end plate 510 and the third step portion 130.

[0045] Furthermore, in order to meet the requirements of single-cell assembly and insulation performance, such as Figure 7 and Figure 8 As shown, the single cell of this application also includes a first plastic part 700, which includes a side wall 720 and a bottom wall 710. A first stepped portion 110 is disposed within the mounting space enclosed by the side wall 720 and the bottom wall 710. The bottom wall 710 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 first plastic part 700. The two sides of the vertical rib 210 extend to the bottom wall 710 and the third stepped portion 130, respectively.

[0046] As described above, compared to the prior art, this application eliminates the bare aluminum plate, reducing one component in the battery structure and simplifying the overall structure of the single cell. This reduces raw material costs and assembly steps in the production process, improving production efficiency, reducing the defect rate caused by assembling multiple components, and thus lowering production costs.

[0047] Furthermore, in the embodiments of this application, the single battery cell further includes an electrode assembly 400, a tab 300, and a seal 600. The terminal post 100 has a through hole extending through itself along its length X, the through hole sequentially penetrating a first step portion 110, a second step portion 120, and a third step portion 130. The seal 600 is welded to the wall of the through hole in the terminal post 100. The tab 300 extends from the electrode assembly 400, passes through the through hole in the terminal post 100, and is welded to the side of the seal 600 facing the tab 300. The side of the seal 600 facing away from the tab 300 is exposed to the terminal post 100.

[0048] This design offers several advantages. First, the seal 600 is welded to the wall of the through hole in the pole post 100, allowing the tab 300 to pass through the through hole in the pole post 100 and be directly welded to the seal 600. Compared to existing technologies, this direct welding of the tab 300 to the seal 600 reduces internal resistance, welding processes, and the number of components. Second, after welding to the seal 600, the tab 300 is bent within the through hole of the pole post 100, saving space and improving product competitiveness.

[0049] Furthermore, it is worth mentioning that in the embodiments of this application, such as Figures 1 to 6 As shown, the cross-sections of the first step portion 110, the second step portion 120, the third step portion 130, the terminal through hole 511, the through hole, and the seal 600 of this application are all waist-shaped or elliptical. By changing the cross-sections of the above structures to elliptical or waist-shaped, the dimensions of the seal 600 (and the terminal 100) in the longitudinal direction X of the closed end plate 510 are increased as much as possible, making its cross-sectional area larger than that of a circle. In this way, under the premise of the limited width of the closed end plate 510, the flow area of ​​the seal 600 (and the terminal 100) is increased, and the flow capacity is improved. This allows the closed end plate 510 with the above-mentioned seal 600 (and the terminal 100) to meet the increasingly higher capacity requirements and increasingly faster charging speed requirements of batteries, and also reduces the dimensions of the seal 600 (and the terminal 100) in the width direction of the closed end plate 510, so that the closed end plate 510 can be used in more applications.

[0050] In the embodiments of this application, when the cross-sections of the pole post 100, the through hole, and the seal 600 are elliptical, the major axis of the ellipse extends along the length direction X of the closed end plate 510, and the minor axis extends along the width direction of the closed end plate 510. Therefore, the seal 600 (and pole post 100) with an elliptical cross-section has an elliptical actual flow area, which maximizes the utilization of the distance along the length direction X of the closed end plate 510 and facilitates the extension of the seal 600 (and pole post 100) along the length direction X of the closed end plate 510, increasing the flow area of ​​the seal 600 (and pole post 100). Figures 1 to 6 As shown, when the cross-section of the seal 600 (and the pole 100) is waist-shaped (racetrack-shaped), the length of the waist extends along the length direction X of the closed end plate 510, and the width of the waist extends along the width direction of the closed end plate 510.

[0051] In addition, the cross-sections of the pole post 100, the through hole, and the seal 600 are elliptical or waist-shaped. When the bottom of the seal 600 is welded to the tab 300, and when the top of the seal 600 is welded to the external busbar, the elliptical or waist-shaped cross-section has a larger cross-sectional area than the circular one, which further increases the flow area of ​​the seal 600 (and the pole post 100) and improves the flow capacity.

[0052] According to a second aspect of this application, an electrical device is provided, including a single battery cell as described above.

[0053] 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, characterized by, The single battery cell has a length direction and includes two outer casings; Each of the housings includes a closed end and an open end opposite to each other in the length direction. The open end of the housing is openly disposed, and the closed end of the housing is formed with a closed end plate. The closed end plate has an electrode through hole for electrode mounting. The two open ends of the two housings are abutted to each other. Both of the aforementioned shells are integral stamped structures.

2. The single-cell battery according to claim 1, characterized in that, The single cell also includes an electrode post, which includes a first stepped portion, a second stepped portion, and a third stepped portion connected in sequence; the cross-sectional area of ​​the first stepped portion and the third stepped portion is larger than the cross-sectional area of ​​the second stepped portion. The inner wall of the through hole of the pole column mates with the second step portion, and the closed end plate is limited between the first step portion and the third step portion.

3. The single-cell battery according to claim 2, characterized in that, The single battery cell also includes electrode assembly, tabs, and sealing components; The pole post is provided with a through hole that extends through itself along the length direction. The through hole sequentially passes through the first step portion, the second step portion, and the third step portion. The sealing element is welded to the wall of the through hole of the pole post. The electrode tab is led out from the electrode assembly, passes through the through hole of the electrode post, and is welded to the side of the seal facing the electrode tab, while the side of the seal facing away from the electrode tab is exposed to the electrode post.

4. The single-cell battery according to claim 3, characterized in that, The individual battery also includes a sealing ring; The sealing ring is sleeved on the second step portion and disposed between the second step portion and the closed end plate, and part of the sealing ring is press-fitted between the closed end plate and the third step portion.

5. The single-cell battery according to claim 4, characterized in that, The sealing ring includes a vertical rib and an outer ring connected to each other. The outer ring is disposed along the outer edge of the vertical rib. The vertical rib is sleeved on the second step portion and disposed between the second step portion and the closed end plate. The outer ring is press-fitted between the closed end plate and the third step portion.

6. The single-cell battery according to claim 5, characterized in that, The single cell also includes a first 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, and the bottom wall is provided with a through hole for the second stepped portion to pass through. The side of the first step portion away from the second step portion is exposed to the outside of the first plastic part, and the two sides of the vertical rib extend to the bottom wall and the third step portion, respectively.

7. The single-cell battery according to any one of claims 1-6, characterized in that, The two outer shells have the same structure.

8. The single-cell battery according to any one of claims 1-6, characterized in that, The two open ends of the two said shells are welded to each other.

9. The single-cell battery according to any one of claims 3-6, characterized in that, The cross-sections of the first step portion, the second step portion, the third step portion, the through hole, and the seal are all waist-shaped or elliptical.

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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