A patch structure and a cylindrical power battery

Abstract

This utility model provides a patch structure and a cylindrical power battery, relating to the field of battery technology. The patch structure includes: a top cover end plate, a top cover patch, and a terminal end plate. One end of the top cover end plate is welded to the top cover of the cylindrical battery. The top cover patch is disposed on the top cover of the cylindrical battery and covers the top cover end plate located on the top cover. The top cover patch has terminal holes matching the characteristics of the battery's terminals and explosion-proof holes matching the explosion-proof valve. One end of the terminal end plate is fixed to the terminal surface of the cylindrical battery, and when installed, the terminal end plate is located above the top cover patch. This utility model allows the top cover patch to be directly attached to the top cover end plate and the top cover, achieving insulation of the top cover surface of the cylindrical battery, avoiding the risk of short circuits caused by accidental contact with the top cover during welding of the terminal end plate or accidental contact with other metal objects during handling, while also ensuring normal pressure relief by the explosion-proof valve. This utility model also discloses a cylindrical power battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a patch structure and a cylindrical power battery. Background Technology

[0002] Currently, lithium-ion / sodium-ion cylindrical batteries are gradually becoming the mainstream product in the new energy industry due to their advantages such as high energy density, good capacity consistency, and ability to support high-rate charging and discharging. More and more manufacturers are continuously expanding their cylindrical battery production capacity while also continuously pursuing high safety. Common questions:

[0003] 1. Generally, cylindrical power batteries choose to weld positive and negative electrode busbars at the top cover end, which will reduce the module cost. However, since the positive and negative electrode busbars are close together, the busbars at the electrode end are prone to contacting the top cover during welding, causing a short circuit. Or, during the transfer after welding, they are prone to contacting other metal objects, causing a short circuit in the battery. This can affect battery performance or even cause a fire risk, posing a safety hazard.

[0004] 2. If the top cover patch is applied first, a window needs to be reserved for welding the patch to the busbar. This requires high-precision alignment between the busbar and the patch window, which places high demands on the assembly process. It will also affect the direct bonding between the busbar and the top cover (i.e., the busbar is supported by the patch below), which may lead to the risk of poor soldering.

[0005] 3. If the top cover patch is attached last, since the positive and negative busbars have already been welded to the top cover, firstly, it is impossible to avoid the risk of short circuit when the busbars at the pole end are welded (accidentally touching the top cover), and secondly, the busbars at the pole end are suspended, so the patch attached above cannot achieve effective insulation between them and the top cover. Utility Model Content

[0006] To solve the aforementioned technical problems, this utility model provides a patch structure in which the top cover patch is directly attached to the top cover end plate and the top cover, achieving insulation of the top cover surface of the cylindrical battery. This avoids the risk of short circuits caused by accidental contact with the top cover during welding of the terminal end plate or accidental contact with other metal objects during handling, while also ensuring normal pressure relief by the explosion-proof valve. This utility model also discloses a cylindrical power battery.

[0007] The technical solution adopted in this utility model is:

[0008] A patch structure, comprising:

[0009] The top cover end plate is set on the top cover of the cylindrical battery.

[0010] A top cover patch is provided on the top cover of the cylindrical battery and covers the top cover end plate located on the top cover. The top cover patch is provided with a terminal hole that matches the characteristics of the terminal and an explosion-proof hole that matches the explosion-proof valve.

[0011] The terminal plate has one end fixed to the terminal surface of the cylindrical battery and is located above the top cover patch.

[0012] Optionally, a first connection hole is provided at the end of the top cover plate away from the cylindrical battery;

[0013] The end of the electrode terminal plate furthest from the cylindrical battery is provided with a second connection hole.

[0014] Optionally, the thickness of the top cover end plate is 0.4mm to 1.0mm.

[0015] Optionally, the top cover patch includes:

[0016] The substrate is made of PC and has a receiving cavity on one side that matches the top cover end plate;

[0017] An adhesive backing layer is disposed on the side of the substrate that is in contact with the top cover of the cylindrical battery.

[0018] Optionally, the height of the receiving cavity is greater than or equal to the thickness of the top cover end plate.

[0019] Optionally, the top cover end plate and the pole end plate are integrally stamped from aluminum or nickel-plated copper.

[0020] Optionally, the top cover end plate includes:

[0021] The bonding end is located on the top cover of the cylindrical battery;

[0022] A connecting end, one end of which is connected to the fitting end;

[0023] The fixed end is connected to the other end of the connecting end.

[0024] Optionally, the bonding end is semi-circular and is coaxial with the cylindrical battery after being disposed on the top cover.

[0025] This utility model directly attaches the top cover patch to the top cover end plate and the top cover, achieving insulation of the top cover surface of the cylindrical battery. This avoids the risk of short circuits caused by accidental contact with the top cover during welding of the terminal end plate or accidental contact with other metal objects during handling, while also ensuring normal pressure relief by the explosion-proof valve. This utility model also discloses a cylindrical power battery. This cylindrical power battery includes:

[0026] The patch structure as described above;

[0027] The battery body is mounted on the top cover of the battery body.

[0028] Compared with the prior art, the beneficial effects of this utility model are:

[0029] The top cover patch is directly attached to the top cover end plate and the top cover, achieving insulation of the top cover surface of the cylindrical battery. This avoids the risk of short circuits caused by accidental contact with the top cover during welding of the terminal end plate or accidental contact with other metal objects during handling, while also ensuring normal pressure relief of the explosion-proof valve. Furthermore, it prevents the occurrence of battery short circuits, ensures the consistency of the cylindrical battery's electrical performance, and guarantees the safety of the explosion-proof valve. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0032] Figure 2 This is a schematic diagram of the structure of the top cover end plate.

[0033] Figure 3 This is a schematic diagram of the top cover patch.

[0034] Figure 4 This is a schematic diagram of the structure of a cylindrical power battery.

[0035] Figure label:

[0036] 1. Top cover end plate; 11. First connecting hole; 12. Adhesive end; 13. Connecting end; 14. Fixing end; 2. Top cover patch; 21. Terminal hole; 22. Explosion-proof hole; 23. Receiving cavity; 3. Terminal end plate; 31. Second connecting hole; 4. Battery body; 5. Top cover; 6. Sheath. Detailed Implementation

[0037] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0038] In the description of this utility model, it should be understood that the terms "thickness", "upper", "lower", "top", "bottom", "axial", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0039] Furthermore, the terms "first" and "second" are used 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 as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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, an electrical connection, or a communication 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0043] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0044] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment of the present invention provides a patch structure, including: a top cover end patch 1, a top cover patch 2, and a terminal end patch 3. One end of the top cover end patch 1 is welded to the top cover 5 of the cylindrical battery. The top cover patch 2 is disposed on the top cover 5 of the cylindrical battery and covers the top cover end patch 1 located on the top cover 5. The top cover patch 2 is provided with a terminal hole 21 matching the terminal characteristics of the battery and an explosion-proof hole 22 matching the explosion-proof valve. One end of the terminal end patch 3 is fixed to the terminal surface of the cylindrical battery, and when the terminal end patch 3 is installed, it is located above the top cover patch 2.

[0045] The top cover end plate 1 is welded to the top cover 5 of the cylindrical battery, and then the top cover patch 2 is attached to the top cover end plate 1 and the top cover 5. After the top cover patch 2 is attached, the terminal features and explosion-proof valve of the cylindrical battery are exposed through the terminal hole 21 and the explosion-proof hole 22 provided on the top cover patch 2. Finally, the terminal end plate 3 is welded on top of the top cover patch 2.

[0046] The top cover patch 2 is directly attached to the top cover end tab 1 and the top cover 5, achieving insulation of the surface of the top cover 5 of the cylindrical battery. This avoids the risk of short circuits caused by accidental contact with the top cover 5 during welding of the terminal end tab 3 or accidental contact with other metal objects during handling, while also ensuring normal pressure relief of the explosion-proof valve. Furthermore, it prevents the occurrence of battery short circuits, ensures the consistency of the cylindrical battery's electrical performance, and guarantees the safety of the explosion-proof valve.

[0047] In one embodiment, such as Figure 1 As shown, to facilitate the connection between the cylindrical battery and the testing equipment, a first connection hole 11 is provided at the end of the top cover end plate 1 that is away from the cylindrical battery. A second connection hole 31 is provided at the end of the terminal end plate 3 that is away from the cylindrical battery.

[0048] More specifically, screws pass through the first connecting hole 11 to fix the top cover end plate 1 to the testing equipment. Screws pass through the second connecting hole 31 to fix the terminal end plate 3 to the testing equipment. The performance of the cylindrical battery is then tested using the testing equipment.

[0049] In one embodiment, in order to facilitate welding of the top cover end plate 1 without affecting the performance of the cylindrical battery, the thickness of the top cover end plate 1 is selected to be between 0.4mm and 1.0mm.

[0050] In one embodiment, such as Figure 1 and Figure 3 As shown, the top cover patch 2 includes a substrate and an adhesive layer. The substrate is made of PC and has a receiving cavity 23 on one side that matches the top cover end piece 1. The adhesive layer is disposed on the side of the substrate that is in contact with the top cover of the cylindrical battery.

[0051] When attaching the top cover patch 2 to the top cover of the cylindrical battery, the adhesive layer of the top cover patch 2 is oriented towards the top cover of the cylindrical battery, and then the receiving cavity 23 is aligned with the top cover end piece 1 provided on the top cover of the cylindrical battery, so that the top cover patch 2 is attached to the top cover of the cylindrical battery and the top cover end piece 1.

[0052] It should be noted that the receiving cavity 23 is stamped out on the substrate by stamping.

[0053] In one embodiment, in order to facilitate complete encapsulation of the top cover end piece 1, the height of the receiving cavity 23 is greater than or equal to the thickness of the top cover end piece 1.

[0054] In one embodiment, in order to avoid affecting the performance of the top cover end plate 1 and the pole end plate 3, the top cover end plate 1 and the pole end plate 3 are integrally stamped from aluminum or nickel-plated copper.

[0055] In one embodiment, such as Figure 2 As shown, to facilitate welding of the top cover end plate 1 to the top cover of the cylindrical battery, the top cover end plate 1 includes: a bonding end 12, a connecting end 13, and a fixing end 14. The bonding end 12 is disposed on the top cover 5 of the cylindrical battery. One end of the connecting end 13 is connected to the bonding end 12. The fixing end 14 is connected to the other end of the connecting end 13, and a first connecting hole 11 is disposed on the fixing end 14.

[0056] In one embodiment, the bonding end 12 is semi-circular and is coaxial with the cylindrical battery after being disposed on the top cover 5.

[0057] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a cylindrical power battery includes: a battery body 4 and a patch structure disposed on the battery body 4.

[0058] The battery is first coated with a film at six points, ensuring the film width at the edge of the top cover 5 is between 1.0mm and 3.5mm. The top cover end tab 1 is welded to the top cover 5 according to a preset position. The top cover patch 2 is then attached to the top cover end tab 1 and the top cover 5. During attachment, the receiving cavity 23 on the patch 2 is aligned with the top cover end tab 1, the terminal hole 21 is aligned with the terminal feature, and the explosion-proof valve is aligned with the explosion-proof hole 22. After alignment, the top cover patch 2 and the top cover 5 are bonded together. Next, the terminal end tab 3 is welded to the terminal feature of the battery according to a preset position. Finally, the battery body 4 is fixed to the testing equipment for inspection.

[0059] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A patch structure, characterized in that, include: The top cover end plate is set on the top cover of the cylindrical battery. A top cover patch is provided on the top cover of the cylindrical battery and covers the top cover end plate located on the top cover. The top cover patch is provided with a terminal hole that matches the characteristics of the terminal and an explosion-proof hole that matches the explosion-proof valve. The terminal plate has one end fixed to the terminal surface of the cylindrical battery and is located above the top cover patch.

2. The patch structure according to claim 1, characterized in that, The top cover end plate is provided with a first connection hole at the end away from the cylindrical battery; The end of the electrode terminal plate furthest from the cylindrical battery is provided with a second connection hole.

3. The patch structure according to claim 1, characterized in that, The thickness of the top cover end plate is 0.4mm~1.0mm.

4. The patch structure according to claim 1, characterized in that, The top cover patch includes: The substrate is made of PC and has a receiving cavity on one side that matches the top cover end plate; An adhesive backing layer is disposed on the side of the substrate that is in contact with the top cover of the cylindrical battery.

5. The patch structure according to claim 4, characterized in that, The height of the receiving cavity is greater than or equal to the thickness of the top cover end plate.

6. The patch structure according to claim 1, characterized in that, The top cover end plate and the pole end plate are integrally stamped from aluminum or nickel-plated copper.

7. The patch structure according to claim 1, characterized in that, The top cover end plate includes: The bonding end is located on the top cover of the cylindrical battery; A connecting end, one end of which is connected to the fitting end; The fixed end is connected to the other end of the connecting end.

8. The patch structure according to claim 7, characterized in that, The bonding end is semi-circular and is set on the top cover and coaxial with the cylindrical battery.

9. A cylindrical power battery, characterized in that, include: The patch structure as described in any one of claims 1-8; The battery body is mounted on the top cover of the battery body.

Images