Cylindrical battery

Abstract

This utility model discloses a cylindrical battery, belonging to the field of battery technology. The cylindrical battery includes a positive current collector and a positive cover plate. A connecting portion is formed at one end of the positive current collector, and a positioning protrusion is stamped on the positive cover plate. A positioning groove is correspondingly formed on the back of the positioning protrusion, and the connecting portion is welded to the positioning groove. The positioning protrusion formed by the positive cover plate and the positioning groove on its back cooperate with each other, changing the flattened design of the positive end face structure of the cylindrical battery without a positive terminal post in the past. This allows users to quickly locate the positive current collector in the positioning groove through the positioning protrusion during subsequent testing, enabling quick and accurate testing of the cylindrical battery. At the same time, it enhances the stability of the connection between the positive current collector and the positive cover plate, effectively reducing the risk of connection fatigue failure caused by vibration, and making the connection between the positive current collector and the positive cover plate more reliable.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and more specifically, to a cylindrical battery. Background Technology

[0002] Cylindrical lithium batteries are widely used in consumer electronics, power tools, energy storage systems, and new energy vehicles due to their mature technology, high standardization, and low cost. For example, Chinese patent document (publication number: CN 212136494U) provides a device comprising a positive electrode cover and a negative electrode cover. The positive electrode cover includes a positive electrode substrate, a positive electrode post, a positive electrode current collector, and an explosion-proof valve. The positive electrode substrate and positive electrode post are integrally formed. The explosion-proof valve is located on the positive electrode substrate and forms a 90° angle with the liquid injection hole on the positive electrode substrate. The negative electrode cover includes a negative electrode substrate, a negative electrode post, an insulating gasket, a stop bracket, and a negative electrode current collector. The negative electrode post has a riveted structure, and the insulating gasket, negative electrode substrate, stop bracket, and negative electrode current collector are sandwiched between the top and bottom of the negative electrode post. This device can increase the capacity of a single battery cell within a limited space.

[0003] However, the integral molding of the positive electrode substrate and the positive electrode post makes it difficult to directly apply traditional visual inspection methods based on electrode post positioning and feature extraction, resulting in time-consuming and labor-intensive inspection of this type of cylindrical battery.

[0004] The relevant technologies do not provide effective solutions to the above problems. Utility Model Content

[0005] To address the difficulty in testing cylindrical batteries without a positive electrode post in related technologies, this application provides a cylindrical battery comprising: a positive electrode current collector and a positive electrode cover plate. One end of the positive electrode current collector has a connecting portion, and the positive electrode cover plate has a positioning protrusion formed by stamping. The back side of the positioning protrusion corresponds to a positioning groove, and the connecting portion is welded to the positioning groove.

[0006] Furthermore, the shape of the connecting portion is adapted to the shape of the positioning protrusion.

[0007] Furthermore, the positioning protrusion is waist-shaped, and the connecting part is also waist-shaped.

[0008] Furthermore, the top surface of the positioning protrusion is a plane, and the top surface is parallel to the bottom surface of the positioning protrusion.

[0009] Furthermore, the outer edge of the connecting portion extends beyond the outer edge of the positioning groove.

[0010] Furthermore, the top surface of the positioning protrusion and the side surface of the positioning protrusion are rounded.

[0011] Furthermore, the height of the positioning protrusion is H, where 1mm ≤ H ≤ 3mm.

[0012] Furthermore, it also includes a negative current collector, which is penetrated by two copper rivets. One side of the negative current collector is connected in sequence to a stop frame, a sealing ring, a negative electrode substrate, a negative electrode insulating plate, and an aluminum pressure plate via the copper rivets.

[0013] Furthermore, an explosion-proof valve is provided on one side of the positioning protrusion, and an explosion-proof valve film is provided on the explosion-proof valve. A sealing aluminum sheet is provided on the other side of the positioning protrusion opposite to the explosion-proof valve.

[0014] Compared with the prior art, the technical solution provided by this utility model has the following advantages: The positioning protrusion formed by the positive electrode cover plate cooperates with the positioning groove on its back, changing the flattened design of the positive terminal face structure of the cylindrical battery without a positive electrode post in the past. This allows users to quickly locate the positive current collector in the positioning groove through the positioning protrusion during subsequent testing, enabling quick and accurate testing of the cylindrical battery. At the same time, it enhances the stability of the connection between the positive current collector and the positive electrode cover plate, effectively reducing the risk of connection fatigue failure caused by vibration, and making the connection between the positive current collector and the positive electrode cover plate more reliable. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings: Figure 1 This is a schematic diagram of a cylindrical battery structure according to an embodiment of this application; Figure 2 This is a schematic diagram of the cylindrical battery portion structure according to an embodiment of this application; Figure 3 This is an exploded view of the cylindrical battery portion mechanism according to an embodiment of this application; Figure 4 This is an exploded view of the cylindrical battery portion mechanism according to an embodiment of this application; Figure 5 This is a schematic diagram of a cylindrical battery structure according to an embodiment of this application; Figure 6 This is a schematic diagram of the cylindrical battery portion structure according to an embodiment of this application; Figure 7 This is an exploded view of the cylindrical battery portion mechanism according to an embodiment of this application; Label Explanation: 100. Positive electrode cover; 110. Positioning protrusion; 120. Positioning groove; 130. Explosion-proof valve; 131. Explosion-proof valve liner; 200. Positive current collector; 210. Connecting part; 300. Negative current collector; 310. Rivet; 320. Stop bracket; 330. Sealing ring; 340. Negative electrode substrate; 350. Negative electrode insulating plate; 360. Aluminum pressure plate. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0017] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0018] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.

[0019] Reference Figure 1-7 As shown, this application provides a cylindrical battery, such as Figure 2-4 As shown, it includes a positive electrode cover plate 100 and a positive electrode current collector 200. A connecting portion 210 is formed at one end of the positive electrode current collector 200. A positioning protrusion 110 is formed by stamping on the positive electrode cover plate 100. The back side of the positioning protrusion 110 is a corresponding positioning groove 120. The connecting portion 210 is welded to the positioning groove 120.

[0020] In this way, the positioning protrusion 110 formed by the positive electrode cover plate 100 cooperates with the positioning groove 120 behind it, changing the flat design of the positive terminal face structure of the cylindrical battery without a positive electrode post in the past. This allows the user to quickly locate the positive current collector 200 in the positioning groove 120 through the positioning protrusion 110 during subsequent testing, and to perform quick and accurate testing of the cylindrical battery. At the same time, it enhances the stability of the connection between the positive current collector 200 and the positive electrode cover plate 100, effectively reduces the risk of connection fatigue failure caused by vibration, and makes the connection between the positive current collector 200 and the positive electrode cover plate 100 more reliable.

[0021] Furthermore, the positioning protrusion 110 and its corresponding positioning groove 120 formed by the stamping are equivalent to forming a reinforcing rib structure on the positive electrode cover plate 100, which enhances the local rigidity and deformation resistance of the cover plate in this area and improves the overall ability of the cylindrical battery to resist external impact.

[0022] Preferably, such as Figure 4 As shown, the shape of the connecting part 210 is adapted to the shape of the positioning protrusion 110. This conformal design ensures the maximum contact area and welding strength, while also facilitating the uniformity of stress distribution.

[0023] Optionally, the positioning protrusion 110 can be circular, rectangular, or other shapes.

[0024] Preferred, such as Figure 4 As shown, the positioning protrusion 110 is waist-shaped, and the transition curve generally helps to distribute stress more evenly, reduce stress concentration, and prevent the positioning protrusion 110 from affecting the stability of the connection of the positive current collector 200 on the other side of the positive electrode cover plate 100 after being bumped. Compared with the circular positioning protrusion 110, the waist-shaped positioning protrusion 110 is better able to avoid other components of the positive electrode cover plate 100.

[0025] Specifically, such as Figure 4 As shown, the connecting part 210 is also waist-shaped.

[0026] Furthermore, such as Figure 2 As shown, the top surface and the side surface of the positioning protrusion 110 are rounded to further reduce the stress concentration problem that may exist in the positioning protrusion 110.

[0027] Preferably, such as Figure 2 As shown, the top surface of the positioning protrusion 110 is flat and parallel to the bottom surface. If the top surface of the positioning protrusion 110 is curved, it would be inconvenient for the manufacturer to perform stable contact testing on the molded cylindrical battery, and the probe would easily slip, resulting in poor contact and affecting the testing accuracy and efficiency. Therefore, the positioning protrusion 110 in this embodiment can provide a more stable contact platform for the probe of the testing equipment.

[0028] As a preferred option, such as Figure 4 As shown, the outer edge of the connecting portion 210 extends beyond the outer edge of the positioning groove 120, ensuring that the connecting portion 210 fully covers the area where the positioning protrusion 110 is located. This design guarantees that the corresponding positioning protrusion 110 can be accurately positioned to the connecting portion 210. This design ensures that the connecting portion 210 can completely cover and be welded to the entire area where the positioning groove 120 is located, providing sufficient tolerance for the welding process. Simultaneously, it ensures that regardless of the shape of the positioning protrusion 110 and its corresponding positioning groove 120, the connecting portion 210 can provide sufficient structural support and current transmission path, thereby allowing the positioning protrusion 110 to be more accurately guided to the area where the connecting portion 210 is located.

[0029] Specifically, the height of the positioning protrusion 110 is H, where 1mm ≤ H ≤ 3mm. If the height H is less than 1mm, the positioning protrusion 110 will still have a relatively difficult time with the subsequent detection process. If the height H is greater than 3mm, it will increase the volume of the cylindrical electrode and make it more susceptible to collision problems.

[0030] Specifically, such as Figure 4 As shown, an explosion-proof valve 130 is provided on one side of the positioning protrusion 110, and an explosion-proof valve 130 film is provided on the explosion-proof valve 130. On the other side of the positioning protrusion 110 opposite to the explosion-proof valve 130, a sealing aluminum sheet 140 is provided.

[0031] As a specific solution, such as Figure 5-7 As shown, the cylindrical battery also includes a negative electrode current collector 300, which is penetrated by two copper rivets 310. One side of the negative electrode current collector 300 is sequentially connected to a stop bracket 320, a sealing ring 330, a negative electrode substrate 340, a negative electrode insulating plate 350, and an aluminum pressure plate 360 ​​via the copper rivets 310. The integration of multiple components through riveting and welding improves the stability and reliability of the entire negative electrode current collector structure under vibration conditions. In this application, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cylindrical battery, characterized in that, include: The positive current collector and the positive cover plate are provided. One end of the positive current collector is formed with a connecting part. The positive cover plate is stamped with a positioning protrusion. The back of the positioning protrusion is corresponding to a positioning groove. The connecting part is welded to the positioning groove.

2. A cylindrical battery according to claim 1, characterized in that: The shape of the connecting part is adapted to the shape of the positioning protrusion.

3. A cylindrical battery according to claim 2, characterized in that: The positioning protrusion is waist-shaped, and the connecting part is also waist-shaped.

4. A cylindrical battery according to claim 1, characterized in that: The top surface of the positioning protrusion is a plane, and the top surface is parallel to the bottom surface of the positioning protrusion.

5. A cylindrical battery according to claim 1, characterized in that: The outer edge of the connecting part extends beyond the outer edge of the positioning groove.

6. A cylindrical battery according to claim 1, characterized in that: The top surface and the side surface of the positioning protrusion are rounded.

7. A cylindrical battery according to claim 1, characterized in that: The height of the positioning protrusion is H, where 1mm ≤ H ≤ 3mm.

8. A cylindrical battery according to claim 1, characterized in that: It also includes a negative current collector, which is penetrated by two copper rivets. One side of the negative current collector is connected in sequence to a stop frame, a sealing ring, a negative electrode substrate, a negative electrode insulating plate, and an aluminum pressure plate via the copper rivets.

9. A cylindrical battery according to claim 1, characterized in that: An explosion-proof valve is provided on one side of the positioning protrusion, and an explosion-proof valve film is provided on the explosion-proof valve. A sealing aluminum sheet is provided on the other side of the positioning protrusion opposite to the explosion-proof valve.

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