Aluminum busbar structure for capacitor

Abstract

The utility model discloses an aluminum busbar structure for a capacitor, which comprises a busbar, a busbar flat plate part, a busbar bending part, a core welding end, a busbar cavity part and an external mounting terminal, and is characterized in that the busbar comprises the busbar bending part and the busbar flat plate part, and the busbar is made of a pure aluminum metal material; by replacing and innovating the aluminum material of the busbar structure for the capacitor, the requirement of the busbar structure of the capacitor is met, and the overcurrent capability, the connection strength requirement and the like of the busbar of the capacitor are ensured. The preparation cost of the busbar structure for the capacitor can be greatly reduced while the product performance is ensured, and the busbar structure has the advantages of low cost and high efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitor product production, in particular to a busbar structure of a capacitor for new energy vehicles in the new energy field, that is, an aluminum busbar structure for capacitors. Background Technique

[0002] Due to its own advantages, such as high safety, long service life, large temperature wave current resistance, stable performance, etc., metallized film capacitors have been gradually widely used in the fields of new energy, automotive electronics, rail transit, industrial control, frequency conversion, etc. Especially in the field of new energy vehicles, the demand for film capacitors is increasing. Metallized film capacitors mainly consist of a core of non-inductive wound metallized film, a busbar, a plastic shell, and epoxy potting glue. The main process is that the cores are connected in parallel and welded to the solder joints at the core welding ends of the busbar, directly installed into the plastic shell, then epoxy potting glue is applied, and it is encapsulated through high-temperature curing, leaving the external installation terminal part of the busbar for performance testing and customer installation. Most of the busbars used in this production process are red copper, which are formed into the required structure by means of laser cutting or stamping. At the same time, to avoid the oxidation of copper by the environment, the surface of the copper busbar will be passivated or electroplated with a tin layer. However, currently, due to the increasing price of red copper year by year, it has become the main material cost of such metallized film capacitors, causing great pressure on the comprehensive manufacturing cost of such metallized film capacitors; continuous development is needed; how to develop a new busbar structure to replace the existing red copper busbar to reduce costs and at the same time meet the performance requirements of such metallized film capacitors has become the future development trend of such metallized film capacitors.

[0003] For example, in Chinese Patent Publication No. CN 113963950A, the disclosed utility model name is "A Capacitor Busbar and a Capacitor". The present utility model provides a capacitor busbar and a capacitor. The capacitor busbar includes: a main body and electrode terminals. The surface of the main body and the electrode terminals opposite to the end face electrode is the first surface, and the surface opposite to the first surface is the second surface; the electrode terminals extend from the specified edge of the main body in a direction orthogonal to the thickness direction of the main body. The electrode terminals have a bending part and an extending part. The first surface of the extending part is suitable for welding and fitting with the end face electrode. The bending part is located between the extending part and the main body. The structure of the bending part is bent and deformed from the specified edge of the main body in the thickness direction of the main body until the first surface of the extending part is lower than the first surface of the main body. This can ensure the close fitting of the electrode terminals and the end face electrode, reduce the contact resistance between the busbar and the core, reduce the risk of capacitance electrical parameter failure, ensure the moisture-proof performance of the capacitor, and avoid the situation of the busbar breaking during the capacitor manufacturing process.

[0004] Therefore, how to provide a busbar structure made of aluminum material for capacitors, that is, on the premise of ensuring the structural performance of the capacitor busbar body, it can meet the requirements of the busbar structure of metallized film capacitors in the new energy field through the replacement and innovation of the aluminum material of the busbar structure for metallized film capacitors, and ensure the overcurrent capacity and connection strength requirements of the capacitor busbar, etc. It preferably meets the above performance requirements of the capacitor busbar, that is, while ensuring the product performance, it can greatly reduce the cost, and has the advantages of low cost, high efficiency and high reliability. It improves the comprehensive performance of the film capacitor; and achieves the purpose of cost reduction and emission reduction. Summary of the Invention

[0005] A busbar structure made of aluminum material for capacitors disclosed by the present invention includes a busbar, a busbar flat part, a busbar bending part, a core welding end, a busbar cavity part, and an external connection installation terminal. The busbar includes a busbar bending part and a busbar flat part, and the busbar is made of pure aluminum metal material; through the replacement and innovation of the aluminum material of the busbar structure for capacitors, it meets the requirements of the busbar structure of capacitors, and ensures the overcurrent capacity and connection strength requirements of the capacitor busbar, etc. While ensuring the product performance, it can greatly reduce the manufacturing cost of the busbar structure for capacitors, and has the advantages of low cost, high efficiency and high reliability.

[0006] A busbar structure made of aluminum material for capacitors provided by the present invention, the busbar structure includes a busbar, a busbar flat part, a busbar bending part, a core welding end, a busbar cavity part, and an external connection installation terminal. The busbar includes a busbar bending part and a busbar flat part. The busbar bending part is arranged at a corresponding position on one side edge of the busbar flat part. A plurality of busbar cavity parts are arranged and evenly distributed on the busbar flat part. One end of the external connection installation terminal is fixedly connected to a corresponding position of the busbar bending part; the busbar is made of pure aluminum metal material; one end of the core welding end is fixedly connected to a corresponding position of the busbar flat part made of aluminum metal material inside the busbar cavity part.

[0007] For the described busbar structure made of aluminum material for capacitors, a connecting part is arranged on the busbar bending part, and the external connection installation terminal is movably or fixedly connected to the busbar bending part of the busbar through the connecting part.

[0008] Preferably, a groove is arranged at a position corresponding to the connection part of the core welding end inside the busbar cavity part of the busbar flat part, and a protrusion is arranged at one end of the core welding end, and it can be movably or fixedly clamped in the groove in a corresponding matching manner.

[0009] Furthermore, for the described busbar structure made of aluminum material for capacitors, both the external connection installation terminal and the core welding end are made of pure copper material.

[0010] In the described aluminum busbar structure for a capacitor, a reinforcement plate is further provided on the connection part of the busbar bending part, and the external mounting terminal is movably or fixedly connected to the connection part through the reinforcement plate.

[0011] A kind of aluminum busbar structure for a capacitor disclosed by the present utility model is aimed at the special busbar of the current metallized film capacitor mainly made of purple copper material through laser cutting, die stamping, welding, and surface treatment. However, with this current technology, the main disadvantage is that the busbar for the capacitor prepared with all pure copper or all purple copper material has a high cost and can no longer meet the customer's demand for cost control of the busbar. Therefore, it is urgent to use metal aluminum material to replace the pure purple copper or pure copper busbar or copper busbar structure. For the large component structures in the busbar flat part 2 and the busbar bending part 1b of the busbar structure, aluminum materials are used for replacement, while the easily foldable components such as the external mounting terminal 5 and the core welding end 3 still need to be prepared with pure copper materials. This not only meets the above requirements for cost reduction in the production of the busbar for the capacitor but also can achieve the performance requirements of using the busbar as the busbar of the metallized film capacitor.

[0012] Since the price of aluminum in the present utility model is much lower than that of copper, the cost of the capacitor busbar or the capacitor busbar structure prepared with the above structure of the present utility model will be greatly reduced by about 40% based on the current price. At the same time, the overcurrent capacity of the busbar is preferably retained. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a three-dimensional structure schematic diagram of the aluminum busbar for the capacitor of the utility model.

[0014] Figure 2 is a front view structure schematic diagram of the busbar 1.

[0015] Figure 3 is for Figure 2 an enlarged cross-sectional structure schematic diagram at A.

[0016] In the figure, 1 is the busbar, 1b is the busbar bending part, 1-1 is the reinforcement plate, 2 is the busbar flat part, 201 is the groove, 3 is the core welding end, 301 is the protrusion, 104 is the busbar cavity part, 5 is the external mounting terminal, and 6 is the connection part. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The terms such as "upper", "lower", "bottom", "top", "left", "right", etc. described in this application document are in reference to the accompanying drawings of the specification disclosed by the present utility model. The term "bus bar" or "capacitor bus bar" in the present utility model has the same meaning. The term "aluminum material" in the content of the present utility model refers to the aluminum metal material used for preparing the bus bar structure; while the term "copper" refers to electrolytic copper, both of which are conventional metal materials used for preparing bus bars. The copper bar or pure copper bar both refer to the copper bus bar, and the materials required for them can be obtained commercially.

[0018] As Figures 1-3 shown, a three-dimensional structure of an aluminum material bus bar for a capacitor disclosed by the present utility model, the bus bar structure includes a bus bar 1, a bus bar flat part 2, a bus bar bending part 1b, a core welding end 3, a bus bar cavity part 4, and an external connection installation terminal 5. The bus bar 1 includes a bus bar bending part 1b and a bus bar flat part 2. The bus bar bending part 1b is arranged at a corresponding position on one side edge of the bus bar flat part 2. A plurality of bus bar cavity parts 4 are provided and are evenly distributed on the bus bar flat part 2. Generally, they are evenly distributed on the surface of the bus bar flat part 2 according to needs. One end of the external connection installation terminal 5 is fixedly connected to a corresponding position of the bus bar bending part 1b. The bus bar 1 is made of pure aluminum metal material. One end of the core welding end 3 is fixedly connected to a corresponding position of the bus bar flat part 2 made of aluminum metal material inside the bus bar cavity part 4.

[0019] As Figure 2 shown, for the aluminum material bus bar structure for a capacitor, a connection part 6 is arranged on the bus bar bending part 1b. The external connection installation terminal 5 is movably or fixedly connected to the bus bar bending part 1b of the bus bar 1 through the connection part 6. At the same time, a reinforcing plate 1-1 is also arranged on the connection part 6 of the bus bar bending part 1b. The external connection installation terminal 5 is movably or fixedly connected to the connection part 6 through the reinforcing plate 1-1.

[0020] As Figure 3 shown, preferably, a groove 201 is arranged at a connection position corresponding to the core welding end 3 inside the bus bar cavity part 4 of the bus bar flat part 2, and a protrusion 301 is arranged at one end of the core welding end 3, which can be movably or fixedly clamped in the groove 201 in a corresponding and matching manner.

[0021] Both the external connection installation terminal 5 and the core welding end 3 are made of pure copper material.

[0022] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes can be made to these embodiments without departing from the principle and spirit of the present utility model, and all of them fall within the scope of the patent protection law.

Claims

1. A busbar structure made of aluminum for a capacitor, the busbar structure comprising a busbar (1), a busbar flat plate portion (2), a busbar bent portion (1b), a core welding end (3), a busbar cavity portion (4), and an external mounting terminal (5); the busbar (1) comprising a busbar bent portion (1b) and a busbar flat plate portion (2); the busbar bent portion (1b) being arranged at a corresponding position on one side of the busbar flat plate portion (2); a plurality of busbar cavity portions (4) being arranged and evenly arranged on the busbar flat plate portion (2); and one end of the external mounting terminal (5) being fixedly connected to a corresponding position of the busbar bent portion (1b); wherein the busbar bent portion (1b) is provided at a corresponding position on the busbar flat plate portion (2); and wherein the busbar cavity portions (4) are provided at a plurality of positions and evenly arranged on the busbar flat plate portion (2); and wherein one end of the external mounting terminal (5) is fixedly connected to a corresponding position of the busbar bent portion (1b); The busbar (1) is made of pure aluminum metal material; one end of the core welding end (3) is fixedly connected to a corresponding position of the busbar flat plate part (2) made of aluminum metal material in the busbar cavity part (4).

2. The aluminum busbar structure for capacitors according to claim 1 is characterized in that A connecting portion (6) is provided on the busbar bending portion (1b), and the external mounting terminal (5) is movably or fixedly connected to the busbar bending portion (1b) of the busbar (1) via the connecting portion (6).

3. The aluminum busbar structure for capacitors according to claim 1 is characterized in that A groove (201) is provided in the busbar cavity portion (4) of the busbar flat plate portion (2) at a connection position corresponding to the core welding end (3), and a protrusion (301) is provided at one end of the core welding end (3) and can be correspondingly matched and movably or fixedly snap-fitted into the groove (201).

4. The aluminum busbar structure for capacitors according to claim 1 is characterized in that The external mounting terminal (5) and the core welding end (3) are both made of pure copper material.

5. A capacitor aluminum busbar structure according to claim 1 or 2, characterized in that A reinforcing plate (1-1) is also provided on the connection portion (6) of the busbar bending portion (1b), and the external mounting terminal (5) is movably or fixedly connected to the connection portion (6) via the reinforcing plate (1-1).

Images