Top cover assembly and square shell battery

Abstract

The utility model relates to a top cover assembly and a square shell battery. The top cover assembly comprises a top cover sheet; the lower plastic is positioned on one side of the top cover sheet; one end of the shading part is fixed on the side wall of the lower plastic, the other end of the shading part is used for abutting against the inner wall of the shell of the square-shell battery, and the shading part extends from one end of the side wall of the lower plastic to the other end of the side wall of the lower plastic and is used for shading a gap between the shell of the square-shell battery and the edge of the top cover sheet. According to the technical scheme, the top cover assembly comprises the shading piece, and when the edge of the top cover piece and the edge of the shell are welded, through the shading piece arranged on the lower plastic side wall, the situation that the performance of a battery is affected due to light transmission during laser welding can be avoided. In addition, the utility model also relates to a square shell battery which comprises a shell, a battery cell and any one of the top cover components, the battery cell is positioned in the shell, the top cover component covers the top opening end of the shell, and the other end of the shading piece in the top cover component is propped against the inner side wall of the shell.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a top cover assembly and a square-shell battery. Background Technology

[0002] The square aluminum-cased battery includes an aluminum casing, a battery cell, and a top cover. The battery cell is placed inside the aluminum casing, and the top cover is placed on the aluminum casing and welded to the aluminum casing by laser to seal the aluminum casing.

[0003] The fit between the top cover and the aluminum shell is crucial for welding quality and production yield. Unstable laser welding power or insufficient clamping strength of the tooling may lead to light transmission, meaning the laser directly contacts the battery cell, damaging the cell, affecting battery performance, or even rendering the battery unusable.

[0004] Currently, it is difficult to detect whether laser welding is transparent in online testing. The common method is to disassemble the battery after a period of production to confirm whether laser welding has occurred (disassembling the battery 4 times or more a day). This method seriously affects production efficiency and can only ensure that the disassembled battery has not been welded through. It is not clear whether the battery cells that have not been disassembled are transparent.

[0005] Therefore, there is an urgent need for a new type of prismatic battery that can solve the above problems. Utility Model Content

[0006] Therefore, it is necessary to provide a top cover assembly and a square battery to address the issue of how to avoid light transmission during laser welding that could affect battery performance.

[0007] A top cover assembly, the top cover assembly comprising:

[0008] Top cover plate;

[0009] The lower plastic sheet is located on one side of the top cover plate;

[0010] A light-shielding component, one end of which is fixed to the side wall of the lower plastic, and the other end of which is used to abut against the inner wall of the square battery casing. The light-shielding component extends from one end of the side wall of the lower plastic to the other end of the side wall of the lower plastic, and is used to block the gap between the casing of the square battery and the edge of the top cover.

[0011] The top cover assembly of this utility model includes a light-shielding component, which can block the gap between the shell of the square battery and the edge of the top cover sheet. When welding the edge of the top cover sheet to the edge of the shell, the light-shielding component set on the lower plastic side wall can prevent light from passing through during laser welding, thus avoiding the impact on the battery cells inside the battery and consequently affecting the battery performance.

[0012] In one embodiment, the lower plastic and the light-shielding component are integrally formed.

[0013] In one embodiment, the surface of the light-shielding member away from the top cover sheet is arc-shaped, and the arc-shaped direction of the surface of the light-shielding member protrudes in the direction away from the lower plastic.

[0014] In one embodiment, there is a gap between the light-shielding member and the top cover sheet.

[0015] In one embodiment, the angle between the surface of the light-shielding member near the top cover sheet and the surface of the top cover sheet near the light-shielding member is an acute angle.

[0016] In one embodiment, the distance between the end of the light-shielding member away from the lower plastic and the surface of the top cover sheet near the light-shielding member is 0.7 mm to 0.9 mm.

[0017] In one embodiment, the end of the lower plastic sheet away from the top cover sheet is provided with a connecting portion for connecting the Mylar film;

[0018] The distance between the end of the light-shielding member near the lower plastic and the surface of the lower plastic away from the top cover sheet is 2mm to 3mm.

[0019] In one embodiment, the lower plastic includes four sidewalls, each of which is provided with the light-shielding element, and a gap is left between the light-shielding elements of adjacent sidewalls.

[0020] A square-shell battery includes a casing, a battery cell, and a top cover assembly of any one of the above. The battery cell is located inside the casing, and the top cover assembly covers the top open end of the casing. The other end of the light-shielding member in the top cover assembly abuts against the inner sidewall of the casing.

[0021] This utility model provides a novel square-shell battery, which includes the aforementioned top cover assembly. The top cover assembly includes a light-shielding component that can block the gap between the battery casing and the edge of the top cover. When welding the edge of the top cover to the edge of the casing, the light-shielding component on the lower plastic sidewall can prevent light from passing through during laser welding and affecting the battery cells inside, thereby affecting battery performance.

[0022] In one embodiment, the prismatic battery further includes a Mylar membrane covering the outside of the cell, the top end of which is fixed to the sidewall of the lower plastic sheet away from the top cover. Attached Figure Description

[0023] Figure 1 This is a plan view of the top cover assembly according to one embodiment of the present invention;

[0024] Figure 2For along Figure 1 A cross-sectional schematic diagram of AA in the middle;

[0025] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0026] Figure 4 This is an enlarged schematic diagram of another embodiment;

[0027] Figure 5 This is a perspective view of the top cover assembly according to one embodiment of the present utility model;

[0028] Figure 6 for Figure 5 A magnified view of a portion of the image;

[0029] Figure 7 This is a schematic diagram of the wound battery cell and its casing;

[0030] Figure 8 This is a schematic diagram of a square-shell battery according to one embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. Top cover assembly; 110. Top cover sheet; 120. Lower plastic part; 130. Light shield;

[0033] 200, square-shaped battery; 210, casing; 220, battery cell. Detailed Implementation

[0034] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0035] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] Please see Figures 1-6 The top cover assembly 100 of one embodiment of the present invention includes a top cover sheet 110, a lower plastic sheet 120, and a light-shielding member 130.

[0038] The lower plastic piece 120 is located on one side of the top cover piece 110. This utility model does not limit the form of the top cover piece 110 and the lower plastic piece 120, nor the connection method between them.

[0039] In this embodiment, one end of the light-shielding member 130 is fixed to the side wall of the lower plastic 120, and the other end of the light-shielding member 130 is used to abut against the inner wall of the casing 210 of the square battery. The light-shielding member 130 extends from one end of the side wall of the lower plastic 120 to the other end of the side wall of the lower plastic 120, and is used to block the gap between the casing 210 and the edge of the top cover 110 of the square battery. Here, the side wall of the lower plastic 120 refers to the side wall of the lower plastic 120 facing the casing 210. In this embodiment, the light-shielding member 130 extends in a long strip on the side wall of the lower plastic 120, so that it can block the gap between the casing 210 and the edge of the top cover 110 of the square battery from all directions.

[0040] The top cover assembly 100 of this embodiment includes a light shield 130, which can block the gap between the housing 210 of the square battery and the edge of the top cover piece 110. When the edge of the top cover piece 110 is welded to the edge of the housing 210, the light shield 130 provided on the side wall of the lower plastic 120 can prevent light from passing through during laser welding and hitting the battery cell inside the battery, thus preventing damage to the battery cell.

[0041] Based on the aforementioned embodiments, the lower plastic 120 and the light-shielding component 130 are integrally molded. This allows for the simultaneous fabrication of the lower plastic 120 and the light-shielding component 130, improving not only the connection strength but also production efficiency. It should be noted that the lower plastic 120 and the light-shielding component 130 can also be non-integral molded, in which case they are two independent components, fixed together by various feasible fixing methods. Furthermore, when the lower plastic 120 and the light-shielding component 130 are not integrally molded, the material of the light-shielding component 130 is preferably an insulating material to prevent short circuits between the battery interior and the metal casing. For example, it can be made of the same material as the lower plastic 120.

[0042] Based on the aforementioned embodiment, the surface of the light-shielding member 130 away from the top cover plate 110 is arc-shaped, and the arc-shaped direction of the surface of the light-shielding member 130 protrudes in the direction away from the lower plastic 120. At this time, when the lower plastic 120 is placed into the housing 210, the arc-shaped light-shielding member 130 can play a guiding role, which facilitates the assembly of the top cover assembly and the housing 210.

[0043] Based on the aforementioned embodiment, a gap exists between the light-shielding member 130 and the top cover plate 110. This facilitates the robotic arm to reach into the gap between the light-shielding member 130 and the top cover plate 110, grasp the top cover assembly 100, and assemble it with the housing 210. It is understood that any method can be used to create a gap between the light-shielding member 130 and the top cover plate 110.

[0044] In some preferred embodiments, the surface of the light-shielding member 130 away from the top cover plate 110 is arc-shaped, and a gap is provided between the light-shielding member 130 and the top cover plate 110. This arrangement not only guides the assembly of the top cover assembly 100, but also provides a gap for the robotic arm to grasp, preventing the robotic arm from slipping on the arc surface of the light-shielding member 130 when grasping the top cover assembly 100, and further facilitating the assembly of the top cover assembly 100 and the housing 210.

[0045] Based on the aforementioned embodiments, in order to achieve the purpose of having a gap between the light-shielding member 130 and the top cover plate 110, in one embodiment, the included angle between the surface of the light-shielding member 130 near the top cover plate 110 and the surface of the top cover plate 110 near the light-shielding member 130 is an acute angle, such as... Figure 3 As shown. Specifically, the surface of the light-shielding member 130 near the top cover plate 110 and the surface of the top cover plate 110 near the light-shielding member 130 are both planes, and the included angle between the two planes is an acute angle. Further, the included angle between the two planes can be, but is not limited to, 30° to 45°. In this case, the top surface of the light-shielding member 130 is inclined, leaving a gap between the light-shielding member 130 and the bottom surface of the top cover plate 110. Of course, the top surface of the light-shielding member 130 can also be non-planar, for example, it can also be a curved surface or an irregular inclined surface, which can also leave a gap between the light-shielding member 130 and the bottom surface of the top cover plate 110.

[0046] Please see Figure 4To achieve a gap between the light-shielding member 130 and the top cover plate 110, in another embodiment, the distance h0 between the light-shielding member 130 and the top cover plate 110 is greater than 0. This leaves a space between the light-shielding member 130 and the top edge of the side wall of the lower plastic 120, allowing a gap to exist between the light-shielding member 130 and the bottom surface of the top cover plate 110. Specifically, in this embodiment, the top surface of the light-shielding member 130 is inclined, further creating a gap between the light-shielding member 130 and the bottom surface of the top cover plate 110. It should be noted that in this embodiment, as long as the distance h0 between the light-shielding member 130 and the top cover plate 110 is greater than 0, a gap can be created between the light-shielding member 130 and the bottom surface of the top cover plate 110. Furthermore, the light-shielding member 130 is connected to the middle portion of the side wall of the lower plastic 120.

[0047] Based on the aforementioned embodiment, the distance h1 between the end of the light-shielding member 130 away from the lower plastic 120 and the surface of the top cover plate 110 near the light-shielding member 130 is 0.7mm to 0.9mm. This avoids the light-shielding member 130 being too close to the weld, preventing the laser from creating a crater on the light-shielding member 130. Furthermore, the distance h1 between the end of the light-shielding member 130 away from the lower plastic 120 and the surface of the top cover plate 110 near the light-shielding member 130 can be, but is not limited to, 0.7mm, 0.8mm, or 0.9mm.

[0048] Based on the aforementioned embodiment, the end of the lower plastic 120 away from the top cover plate 110 is provided with a connecting portion for connecting the Mylar film; the distance h2 between the end of the light-shielding member 130 near the lower plastic 120 and the surface of the lower plastic 120 away from the top cover plate 110 is 2mm to 3mm. This allows space to be reserved for fixing the Mylar film to the lower side wall of the lower plastic 120. It should be noted that the present invention does not limit the specific form of the connecting portion, and any connecting portion that can connect the Mylar film is within the protection scope of the present invention. Further, the distance h2 between the end of the light-shielding member 130 near the lower plastic 120 and the surface of the lower plastic 120 away from the top cover plate 110 can be, but is not limited to, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm.

[0049] Based on the aforementioned implementation methods, please refer to Figure 6 The lower plastic 120 includes four side walls, each of which is provided with a light-shielding element 130, with gaps between the light-shielding elements 130 of adjacent side walls. When the light-shielding element 130 and the top cover plate 110 are immersed in electrolyte, the electrolyte can flow out through the gaps between adjacent light-shielding elements 130, avoiding leakage and facilitating corrosion prevention.

[0050] At the same time, please combine Figure 7In this embodiment, the battery cell 220 used is a wound battery cell. The two ends of the wound battery cell 220 are round, and there is a certain gap between it and the inner wall of the housing 210. The welding part of the top cover 110 and the housing 210 is far away from the battery cell 220. Therefore, even if light leaks during corner welding, it will not affect the battery cell 220 inside.

[0051] The top cover assembly of this utility model includes a light-shielding component, which can block the gap between the shell of the square battery and the edge of the top cover sheet. When welding the edge of the top cover sheet to the edge of the shell, the light-shielding component set on the lower plastic side wall can prevent light from passing through during laser welding, thus avoiding the impact on the battery cells inside the battery and consequently affecting the battery performance.

[0052] Please see Figure 7 and Figure 8 The square-shell battery 200 of one embodiment of this utility model includes a casing 210, a battery cell 220, and any of the above-mentioned top cover assembly 100. The battery cell 220 is located inside the casing 210, and the top cover assembly 100 covers the open top end of the casing 210. The other end of the light-shielding member 130 in the top cover assembly 100 abuts against the inner sidewall of the casing 210. Figure 3 and Figure 4 As shown.

[0053] Based on the aforementioned embodiments, the square battery 200 also includes a Mylar membrane (not shown) covering the outside of the cell 220. The top end of the Mylar membrane is fixed to the side wall of the lower plastic 120 away from the top cover 110, so as to keep the cell 220 and the casing 210 insulated.

[0054] This utility model provides a novel square-shell battery, which includes the aforementioned top cover assembly. The top cover assembly includes a light-shielding component that can block the gap between the battery casing and the edge of the top cover. When welding the edge of the top cover to the edge of the casing, the light-shielding component on the lower plastic sidewall can prevent light from passing through during laser welding and affecting the battery cells inside, thereby affecting battery performance.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A top cover assembly, characterized in that, The top cover assembly includes: Top cover plate; The lower plastic sheet is located on one side of the top cover plate; A light-shielding component, one end of which is fixed to the side wall of the lower plastic, and the other end of which is used to abut against the inner wall of the square battery casing. The light-shielding component extends from one end of the side wall of the lower plastic to the other end of the side wall of the lower plastic, and is used to block the gap between the casing of the square battery and the edge of the top cover.

2. The top cover assembly according to claim 1, characterized in that, The lower plastic and the light-shielding component are integrally molded.

3. The top cover assembly according to claim 1 or 2, characterized in that, The surface of the light-shielding member away from the top cover is arc-shaped, and the arc-shaped direction of the surface of the light-shielding member protrudes away from the direction of the lower plastic.

4. The top cover assembly according to claim 1 or 2, characterized in that, There is a gap between the light-shielding component and the top cover plate.

5. The top cover assembly according to claim 4, characterized in that, The angle between the surface of the light-shielding member near the top cover and the surface of the top cover near the light-shielding member is an acute angle.

6. The top cover assembly according to claim 1 or 2, characterized in that, The distance between the end of the light-shielding member away from the lower plastic and the surface of the top cover sheet near the light-shielding member is 0.7mm to 0.9mm.

7. The top cover assembly according to claim 6, characterized in that, The lower plastic piece is provided with a connecting part for connecting the Mylar film at the end away from the top cover piece; The distance between the end of the light-shielding member near the lower plastic and the surface of the lower plastic away from the top cover sheet is 2mm to 3mm.

8. The top cover assembly according to claim 1 or 2, characterized in that, The lower plastic includes four side walls, each of which is provided with a light-shielding element, and there is a gap between the light-shielding elements of adjacent side walls.

9. A prismatic battery, characterized in that, The device includes a housing, a battery cell, and a top cover assembly according to any one of claims 1 to 8, wherein the battery cell is located inside the housing, the top cover assembly covers the top open end of the housing, and the other end of the light-shielding member in the top cover assembly abuts against the inner sidewall of the housing.

10. The prismatic battery according to claim 9, characterized in that, The square-shell battery also includes a Mylar membrane covering the outside of the cell, with the top end of the Mylar membrane fixed to the side wall of the lower plastic away from the top cover sheet.

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