Battery cell cover plate, battery pack, and electric device

Abstract

The application relates to a battery cell cover plate, a battery pack and a power utilization device, and belongs to the technical field of batteries. The application is provided with a counterbore at the connection position of a riveting piece and a pole, and a protection assembly is arranged on the counterbore; the protection assembly comprises a protection sheet base material and a ring-shaped rubber ring; the color of the rubber ring is contrasted with the cover plate main body to visually identify the falling-off state, and the protection sheet base material completely covers the connection interface of the riveting piece and the pole to form protection. The application can solve the problem of oxidation and corrosion of the pole, and improve the reliability of the battery cell and the convenience of maintenance.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to cell covers, battery packs, and electrical equipment. Background Technology

[0002] With the development of power batteries, integrated manufacturing technology for cell cover plates has emerged. This technology achieves the connection between the electrode post and the cover plate through an integrated riveting and welding process, featuring high efficiency integration and low contact resistance.

[0003] In related technologies, the problem of oxidation prevention of negative electrode posts is usually addressed by using passivation layer protection combined with environmental control, and the welding of riveting blocks is achieved by argon arc welding combined with inert gas protection.

[0004] However, the above-mentioned process has the following problems:

[0005] First, the mechanical stress generated by the riveting process will damage the passivation layer of the copper negative electrode post. When the ambient temperature and humidity exceed the standard, the exposed metal substrate will quickly undergo oxidation and corrosion, forming verdigris or discoloration.

[0006] Secondly, environmental dust can easily accumulate at the riveting joints due to structural gaps, affecting the quality of subsequent welding of the mortise and tenon joints and posing a risk of explosion.

[0007] Third, when the control accuracy of the welding shielding gas flow rate is insufficient, the helium amount will deviate from the process window, which will cause oxidation discoloration in the weld area and exacerbate the blackening of the electrode surface during the cell formation stage, affecting the appearance.

[0008] Fourth, the proximity of the injection hole to the negative electrode post poses a risk of secondary electrolyte corrosion, and any overflow during the injection process will corrode the negative electrode post.

[0009] These problems collectively lead to a decrease in product yield and an increase in subsequent maintenance costs, making it difficult to meet the high reliability production requirements of power batteries. Summary of the Invention

[0010] Therefore, it is necessary to provide a cell cover, a cell, and a battery pack to address the above problems, thereby isolating the terminals from the external environment and reducing the risk of terminal oxidation and corrosion by adding protective components.

[0011] A battery cell cover plate, comprising:

[0012] The cover plate body has mounting holes.

[0013] The first insulating element and the second insulating element are respectively disposed on both sides of the cover plate body in the thickness direction;

[0014] The pole penetrates the second insulator, the mounting hole, and the first insulator;

[0015] A riveting component is riveted to the end of the pole located on one side of the first insulating component;

[0016] The protective component covers at least the riveting area between the riveted member and the pole post.

[0017] In one embodiment, the riveting component has a countersunk hole with an annular countersunk platform surrounding the riveting area. The countersunk platform is flush with or higher than the riveting area. The protective component is disposed within the countersunk hole.

[0018] In one embodiment, the protective component includes an annular rubber ring and a protective sheet substrate disposed in a central through hole of the rubber ring; the rubber ring is attached to the recessed platform so that the protective sheet substrate covers the riveting area.

[0019] In one embodiment, the rubber ring includes a coloring layer, and the coloring layer has a visible color.

[0020] In one embodiment, the protective sheet substrate is selected from PET or PP and forms a colorless and transparent sheet structure.

[0021] In one embodiment, the annular width W of the rubber ring in the second direction satisfies: 0.5mm ≤ W ≤ 1.2mm.

[0022] In one embodiment, the thickness H2 of the protective component in the first direction satisfies: 0.2mm ≤ H2 ≤ 0.4mm.

[0023] In one embodiment, the height H1 of the countersunk hole in the first direction satisfies: H1≥H2.

[0024] On the other hand, this application provides a battery pack including the cell cover as described above.

[0025] On the other hand, this application provides an electrical device that includes the aforementioned battery pack and is powered by the aforementioned battery pack.

[0026] The aforementioned cell cover, cell, and battery pack have protective components placed inside the countersunk holes at the connection between the rivet and the terminal post. These protective components isolate the external environment, preventing the copper negative terminal post from being exposed to a corrosive environment and significantly reducing the risk of oxidation and discoloration (such as verdigris).

[0027] This application also has the following advantages:

[0028] (1) In this application, any discoloration at the electrode welding point will be covered by the protective component and will not affect the appearance of the battery cell.

[0029] (2) The rubber ring of this application includes a coloring layer and the coloring layer has a visible color. If the protective component falls off or is damaged, it can be quickly identified by the naked eye, which facilitates timely maintenance and reduces the cost of troubleshooting later.

[0030] (3) The protective film substrate of this application is selected from PET or PP, and is colorless and transparent, which does not affect the observation of the electrode state and can withstand the influence of electrolyte for a long time. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of this application.

[0032] Figure 2 for Figure 1 A schematic diagram of the structure under explosive conditions.

[0033] Figure 3 This is a schematic diagram of the structure of the protection component of this application.

[0034] Figure 4 for Figure 1 Sectional view in front view.

[0035] Figure 5 for Figure 4 Enlarged schematic diagram of part A in the diagram.

[0036] Wherein: 100, cover plate body; 200, first insulating component; 300, second insulating component; 400, riveting component; 500, pole post; 600, protection component;

[0037] 410. Sunken platform;

[0038] 610. Protective film substrate; 620. Adhesive ring. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application 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 application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0045] See Figures 1 to 5 The diagram shows a structural schematic of a cell cover plate according to an embodiment of this application.

[0046] This application provides a battery cell cover plate, including a cover plate body 100, a first insulating member 200, a second insulating member 300, a riveting member 400, a terminal post 500, and a protection component 600.

[0047] In some embodiments, the cover plate body 100 is provided with mounting holes for mounting pole posts, and a first insulating member 200 and a second insulating member 300 are respectively provided on both sides of the cover plate body 100 in the thickness direction to achieve electrical isolation between the inside and outside of the battery cell.

[0048] In some embodiments, the pole post 500 vertically penetrates the mounting hole of the cover plate body 100 and is connected to the riveting member 400; the riveting member 400 is fixed to the upper end of the pole post 500 by riveting or welding.

[0049] Furthermore, a countersunk hole is provided above the connection between the riveting component 400 and the pole post 500. The countersunk hole has an annular countersunk platform 410, which surrounds the riveting area. The height H1 of the countersunk hole in the first direction satisfies: H1≥0.15mm.

[0050] In some embodiments, the countertop 410 is flush with the riveting area;

[0051] In some embodiments, the recessed platform 410 is higher than the riveting area.

[0052] In some embodiments, the protective component 600 includes a protective sheet substrate 610 and an annular adhesive ring 620; wherein, the protective sheet substrate 610 is a colorless and transparent sheet structure, selected from PET or PP materials resistant to electrolyte corrosion; the adhesive ring 620 is bonded to the surface of the countersunk platform 410, and a through hole is formed in the middle of the adhesive ring 620 to accommodate the protective sheet substrate 610, and the two together cover the countersunk hole, thereby forming protection for the connection area between the riveting member 400 and the pole post 500.

[0053] Furthermore, the ring width W of the rubber ring 620 in the second direction satisfies: 0.5mm≤W≤1.2mm, preferably 0.8mm; the coloring layer of the rubber ring 620 contrasts with the surface color of the cover plate body 100; for example, a red rubber ring and a black cover plate can be used so that the rubber ring 620 can be quickly identified visually when it falls off.

[0054] In some embodiments, the thickness H2 of the protective component 600 in the first direction satisfies: 0.2mm≤H2≤0.4mm, and the height H1≥H2 of the countersunk hole in the first direction, ensuring that the rubber ring 620 and the protective sheet substrate 610 are fully embedded in the countersunk hole and avoid protrusion.

[0055] In actual operation, the protection component 600 is assembled as follows:

[0056] Machining of the recessed platform 410: After the riveting part 400 and the pole post 500 are connected, an annular recessed platform 410 is formed on the upper end of the riveting part 400 by stamping or cutting process;

[0057] The fit between the protective sheet substrate 610 and the rubber ring 620: The outer edge of the protective sheet substrate 610 fits with the inner edge of the center through hole of the rubber ring 620;

[0058] Adhesive ring 620 bonding: The annular adhesive ring 620 is evenly bonded around the countersunk plate 410 to ensure that the protective sheet substrate 610 is fixed in the countersunk hole to form protection; at this time, the protective sheet substrate 610 is located in the central area of ​​the countersunk hole, so that it completely covers the riveting interface between the riveting part 400 and the pole post 500.

[0059] In other embodiments, this application also provides a battery cell, including the battery cell cover plate described above.

[0060] In other embodiments, this application also provides a battery pack including the above-described battery cells.

[0061] In summary, the protective substrate 610 and the rubber ring 620 of this application form a protective structure, which can avoid the risk of oxidation and corrosion of the terminal post. At the same time, the contrasting color design of the rubber ring 620 enables maintenance personnel to quickly identify whether the protective component has fallen off or is damaged, reducing the cost of troubleshooting. In addition, the dimensional parameters between the recessed platform 410 and the protective component 600 can ensure that the protective structure will not interfere with the assembly of the cell and other components, while maintaining the consistency of the cell's appearance.

[0062] 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.

[0063] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell cover plate, characterized in that, include: The cover plate body has mounting holes. The first insulating element and the second insulating element are respectively disposed on both sides of the cover plate body in the thickness direction; The pole penetrates the second insulator, the mounting hole, and the first insulator; A riveting component is riveted to the end of the pole located on one side of the first insulating component; The protective component covers at least the riveting area between the riveted member and the pole post.

2. The cell cover plate according to claim 1, characterized in that, The riveting component has a countersunk hole with an annular countersunk platform surrounding the riveting area. The countersunk platform is flush with or higher than the riveting area. The protective component is disposed within the countersunk hole.

3. The cell cover plate according to claim 2, characterized in that, The protective component includes an annular rubber ring and a protective sheet substrate disposed in a central through hole of the rubber ring. The protective sheet substrate is attached to the recessed platform by the adhesive ring, so that it covers the riveting area.

4. The cell cover plate according to claim 3, characterized in that, The rubber ring includes a coloring layer, and the coloring layer has a visible color.

5. The cell cover plate according to claim 4, characterized in that, The protective sheet substrate is selected from PET or PP and forms a colorless and transparent sheet structure.

6. The cell cover plate according to claim 3 or 4, characterized in that, The annular width W of the rubber ring in the second direction satisfies: 0.5mm≤W≤1.2mm.

7. The cell cover plate according to claim 3, characterized in that, The thickness H2 of the protective component in the first direction satisfies: 0.2mm≤H2≤0.4mm.

8. The cell cover plate according to claim 7, characterized in that, The height H1 of the countersunk hole in the first direction satisfies: H1≥H2.

9. A battery pack, characterized in that, Including the cell cover as described in any one of claims 1-8.

10. An electrical appliance, characterized in that, Includes the battery pack as described in claim 9.

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