Conductive connecting piece of lithium battery

Abstract

The utility model discloses a conductive connecting piece of a lithium battery, and relates to the technical field of lithium battery production. The conductive connecting piece of the lithium battery comprises a first welding plate, an extension plate and a second welding plate, the first welding plate is used for being welded with a positive electrode or a negative electrode of a lithium battery cell; the extension plate is integrally connected to the tail end of the first welding plate, a first bending part which is bent upwards is arranged between the extension plate and the tail end of the first welding plate, and the first bending part enables the horizontal plane where the extension plate is located to be higher than the horizontal plane where the first welding plate is located; and the second welding plate is integrally connected to the tail end of the extension plate, is bent in an L shape and is used for being welded with a circuit board of the lithium battery. The size and shape precision of the conductive connecting sheet of the lithium battery is high, and the battery performance and the assembly efficiency are ensured.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production technology, and in particular to a conductive connecting piece for lithium batteries. Background Technology

[0002] In a lithium battery pack, individual lithium batteries are connected in series or parallel to form a lithium battery module, and several lithium battery modules are connected in series or parallel to form a lithium battery pack. The series or parallel connection between individual lithium batteries is accomplished by a circuit board and conductive connectors. One end of the conductive connector is connected to the positive or negative terminal of the lithium battery, and the other end is connected to the circuit board. The precision of the conductive connector affects battery performance and assembly efficiency. If the size and shape precision of the conductive connector is low, it will directly affect the current distribution and contact performance inside the battery, thus affecting the battery's energy density, charge / discharge efficiency, and lifespan. Low size and shape precision of the conductive connector will increase the rework or scrapping of batteries due to size or shape issues. Therefore, there is a need to provide a high-precision conductive connector for lithium batteries. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a high-precision conductive connector for lithium batteries, which ensures battery performance and assembly efficiency.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A conductive connector for a lithium battery includes a first welding plate, an extension plate, and a second welding plate. The first welding plate is used to weld to the positive or negative electrode of a lithium battery cell. The extension plate is integrally connected to the tail end of the first welding plate, and an upwardly bent first bend is provided between the extension plate and the tail end of the first welding plate, the first bend causing the horizontal plane of the extension plate to be higher than the horizontal plane of the first welding plate. The second welding plate is integrally connected to the tail end of the extension plate, and the second welding plate is L-shaped and is used to weld to the circuit board of the lithium battery.

[0006] Furthermore, a downwardly bent second bend is provided between the second welding plate and the tail end of the extension plate.

[0007] Furthermore, the extension plate is a flat plate with an arc-shaped bend, and an obstacle space is formed on one side of the extension plate.

[0008] Compared with the prior art, this utility model achieves at least the following beneficial effects:

[0009] The conductive connecting piece of this utility model consists of three sections: a first welding plate, an extension plate, and a second welding plate. During the manufacturing of the conductive connecting piece, the material is divided into three small sections and processed sequentially through cutting, stamping, bending, and other processes. The traditional one-time cutting method generates large and concentrated stress on the entire conductive connecting piece, leading to material deformation. However, by adopting a segmented cutting method, the stress generated by each cutting is concentrated only on the currently processed small section, avoiding the accumulation of stress on the entire conductive connecting piece. This results in a more uniform overall stress distribution, thereby reducing deformation caused by stress concentration, ensuring the flatness and dimensional accuracy of the conductive connecting piece, and avoiding problems such as poor contact or assembly difficulties, thus guaranteeing battery performance and assembly efficiency. Attached Figure Description

[0010] Fig. 1 This is a schematic diagram of the structure of an embodiment of this application;

[0011] Fig. 2 This is a structural schematic diagram from another perspective of an embodiment of this application.

[0012] The numbers in the diagram are: 1. First welding plate; 2. Extension plate; 3. Second welding plate; 4. First bend; 5. Second bend; 6. Clearance space. Detailed Implementation

[0013] The present invention will now be described in detail with reference to exemplary embodiments shown in the accompanying drawings. However, it should be understood that the present application may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided herein to make the disclosure of this application more complete and to fully convey the concept of the present application to those skilled in the art.

[0014] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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. 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" or "more than" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly 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 connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. Moreover, "above," "over," and "on top" of a 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" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0015] like Figs. 1-2As shown in the embodiment of this application, a conductive connecting piece for a lithium battery includes a first welding plate 1, an extension plate 2, and a second welding plate 3. The first welding plate 1 is used to achieve a fixed connection with the positive or negative electrode of the lithium battery cell using laser welding. The extension plate 2 is integrally connected to the tail end of the first welding plate 1, and a first bending portion 4 that bends upward is provided between the extension plate 2 and the tail end of the first welding plate 1. The first bending portion 4 makes the horizontal plane of the extension plate 2 higher than the horizontal plane of the first welding plate 1, ensuring that the first welding plate 1 is in close contact with the positive or negative electrode of the lithium battery cell. The second welding plate 3 is integrally connected to the tail end of the extension plate 2. The second welding plate 3 is L-shaped and is used to achieve a fixed connection with the output terminal of the lithium battery using laser welding.

[0016] Specifically, a downwardly bent second bend 5 is provided between the tail end of the second welding plate 3 and the extension plate 2. By providing the second bend 5, the L-shaped bent second welding plate 3 can be guided to one side of the lithium battery, which facilitates the welding and fixing of the second welding plate 3 to the circuit board inside the lithium battery, so that the output of the lithium battery can be managed by the battery management system (BMS).

[0017] Specifically, the extension plate 2 is a flat plate with an arc-shaped bend, and a clearance space 6 is formed on one side of the extension plate 2. By setting the clearance space 6, the corresponding components on the lithium battery can be cleared.

[0018] The conductive connecting piece of this utility model consists of three sections: a first welding plate 1, an extension plate 2, and a second welding plate 3. During manufacturing, the material is divided into three small sections and processed sequentially through cutting, stamping, and bending. Traditional one-time cutting methods generate significant and concentrated stress across the entire conductive connecting piece, leading to material deformation. However, the segmented cutting method concentrates stress on the currently processed section, preventing stress accumulation across the entire conductive connecting piece and resulting in a more uniform stress distribution. This reduces deformation caused by stress concentration, ensuring the flatness and dimensional accuracy of the conductive connecting piece. The dimensional accuracy is controlled within 0.005 mm, preventing poor contact or assembly difficulties during lithium battery assembly due to dimensional deviations. The bending angle of the conductive connecting piece is controlled within + / - 0.5 degrees, ensuring the shape meets design requirements and preventing angular deviations from affecting internal electrical connections or mechanical assembly of the battery.

[0019] It should be understood that all the above embodiments are exemplary and not restrictive. Any modifications, equivalent changes and alterations made by those skilled in the art to the specific embodiments described above under the concept of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A conductive connector for a lithium battery, characterized in that, include: The first welding plate is used for welding to the positive or negative electrode of the lithium battery cell. An extension plate is integrally connected to the tail end of the first welding plate. An upwardly bent first bend is provided between the extension plate and the tail end of the first welding plate. The first bend makes the horizontal plane of the extension plate higher than the horizontal plane of the first welding plate. The second welding plate is integrally connected to the tail end of the extension plate. The second welding plate is L-shaped and is used for welding to the circuit board of the lithium battery.

2. The conductive connector for a lithium battery according to claim 1, characterized in that: A second downward-bending bend is provided between the second welding plate and the tail end of the extension plate.

3. The conductive connector for a lithium battery according to claim 1, characterized in that: The extension plate is a flat plate with an arc-shaped bend, and an clearance space is formed on one side of the extension plate.

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