Composite belt structure of copper aluminum and resistance alloy

Abstract

The utility model relates to the technical field of current detection, in particular to a copper aluminum and resistance alloy composite belt structure which comprises resistance alloy, copper belts are arranged on the left side and the right side of the resistance alloy, aluminum belts are arranged on the sides, away from the resistance alloy, of the two sets of copper belts, and a plurality of sets of connecting strips are arranged on the sides, away from the resistance alloy, of the copper belts. And a plurality of groups of connecting grooves matched with the connecting strips are formed in the aluminum strip. Through the interference fit of the connecting strips and the connecting grooves and the utilization of a hot melting composite technology, the copper strip and the aluminum strip are mutually infiltrated and fused when being heated and melted and form a firm bonding layer after being cooled, the problem that the copper and aluminum welding difficulty is large is solved, and stable connection is achieved. The resistance alloy and the copper strip are welded through high-energy electron beams, the influence on the resistance alloy performance is reduced, and the electrical performance stability is further guaranteed. The composite belt formed by connecting the copper-aluminum and the resistance alloy not only can keep the stability of the electrical property sampled in the original copper area, but also can realize light weight, and achieves the purposes of reducing cost and improving efficiency.

Description

Technical Field

[0001] This utility model relates to the field of current detection technology, specifically to a composite strip structure of copper, aluminum and resistance alloy. Background Technology

[0002] In the battery management system (BMS) of new energy vehicles, accurate and reliable current sensing plays a decisive role in the safe and stable operation of the battery system. The resistor shunt, as a core component, directly affects the overall efficiency of the BMS. The resistor shunt operates based on Ohm's law and the characteristics of parallel circuits. In a parallel circuit, a resistor of known resistance is connected in parallel with the circuit being measured. Since the voltage across each branch is the same, by measuring the voltage across the shunt resistor and using Ohm's law, the current flowing through that resistor can be calculated, thus obtaining the measured current value.

[0003] In this process, copper, due to its excellent conductivity, is often used in critical connection parts to ensure smooth current transmission, reduce losses and errors caused by connection resistance, and maintain stable electrical performance. Resistance alloys, on the other hand, rely on specific resistivity to precisely set resistance values, enabling the shunt to shunt current according to design requirements. Their good stability, reliability, current carrying capacity, and heat dissipation capabilities ensure the normal operation of the shunt under different conditions.

[0004] However, while pure copper boasts excellent conductivity and electrical properties, its excessive weight and high cost contradict the trend towards lightweight and low-cost development in new energy vehicles. Aluminum, on the other hand, offers advantages in terms of light weight and low cost, but its poor conductivity, especially when joined with other metals, makes welding extremely difficult.

[0005] To address the challenge of welding copper and aluminum, and to enable the resistor shunt to retain the stability of the electrical performance sampled from the original copper region while achieving weight reduction and cost reduction, we propose a composite strip structure of copper, aluminum, and resistor alloy. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a composite strip structure of copper, aluminum, and resistance alloy, which solves the problem of difficult welding of copper and aluminum. This allows the resistance shunt to retain the stability of the electrical performance sampled in the original copper region while achieving weight reduction, thus reducing costs and increasing efficiency.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A composite strip structure of copper, aluminum and resistance alloy includes a resistance alloy, copper strips are provided on both the left and right sides of the resistance alloy, aluminum strips are provided on the side of the two sets of copper strips away from the resistance alloy, several sets of connecting strips are provided on the side of the copper strips away from the resistance alloy, and several sets of connecting grooves matching the connecting strips are formed on the aluminum strips.

[0009] Preferably, the connecting strip and the connecting groove are interference-fitted, and the connecting part is filled with conductive adhesive.

[0010] Preferably, the copper strip and the aluminum strip are combined through a hot-melt composite process.

[0011] Preferably, the resistance alloy is made of copper-manganese alloy.

[0012] Preferably, the resistance alloy is connected to the copper strip by high-energy electron beam welding.

[0013] Preferably, the aluminum strip has mounting holes.

[0014] Beneficial effects

[0015] This invention provides a composite strip structure of copper, aluminum, and resistance alloy. Compared with the prior art, it has the following advantages:

[0016] This composite strip structure of copper-aluminum and resistance alloy utilizes an interference fit between connecting strips and grooves, filled with conductive adhesive to enhance conductivity and connection strength. Simultaneously, a hot-melt composite process allows the copper and aluminum strips to interpenetrate and fuse during heating and melting, forming a strong bonding layer upon cooling. This solves the challenge of difficult copper-aluminum welding, achieving a stable connection. High-energy electron beam welding of the resistance alloy and copper strip minimizes the impact on the resistance alloy's performance, further ensuring stable electrical performance. The composite strip formed by the copper-aluminum and resistance alloy connection retains the stability of the electrical performance sampled from the original copper region while achieving weight reduction, thus reducing costs and increasing efficiency. Attached Figure Description

[0017] Figure 1 This is a front view structural diagram of the main body of this utility model;

[0018] Figure 2 This is a schematic diagram of the main cross-sectional structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the exploded structure of the main body of this utility model;

[0020] Figure 4 For the present utility model Figure 3 Enlarged schematic diagram of the structure at point A in the middle;

[0021] Figure 5 This is a schematic diagram of the connection structure between the aluminum strip and the copper strip of this utility model;

[0022] Figure 6 This is a schematic diagram of the connection structure between the copper strip and the resistance alloy of this utility model.

[0023] In the diagram: 1. Resistance alloy; 2. Copper strip; 3. Aluminum strip; 4. Mounting hole; 5. Connecting strip; 6. Connecting groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-6 This utility model provides a technical solution: a composite strip structure of copper-aluminum and resistance alloy, including resistance alloy 1, copper strips 2 are provided on both the left and right sides of resistance alloy 1, aluminum strips 3 are provided on the side of the two sets of copper strips 2 away from resistance alloy 1, a number of connecting strips 5 are provided on the side of the copper strips 2 away from resistance alloy 1, and a number of connecting grooves 6 matching the connecting strips 5 are opened on the aluminum strips 3.

[0026] By matching the connecting strip 5 with the connecting groove 6, the copper strip 2 and the aluminum strip 3 are tightly connected, solving the welding problem between the copper strip 2 and the aluminum strip 3. The resistance alloy 1, the copper strip 2 and the aluminum strip 3 are integrated to form a composite strip of copper-aluminum and resistance alloy 1, which can not only retain the stability of the electrical performance of the original copper area sampling, but also achieve weight reduction and cost reduction and efficiency improvement.

[0027] The connecting strip 5 and the connecting groove 6 are interference fit, and conductive adhesive is filled at the connection point to enhance the conductivity and connection strength between the copper strip 2 and the aluminum strip 3.

[0028] Copper strip 2 and aluminum strip 3 are combined through a hot-melt composite process.

[0029] The copper strip 2 and aluminum strip 3 permeate and fuse with each other while in a heated and molten state. The setting of connecting strip 5 and connecting groove 6 makes the fusion more uniform and thorough. After cooling, a strong bonding layer is formed, thus tightly bonding the copper strip 2 and aluminum strip 3 into one.

[0030] Resistance alloy 1 is made of copper-manganese alloy. Copper-manganese alloy has a low temperature coefficient of resistance, maintaining a relatively stable resistance value under different temperature conditions and being less affected by temperature fluctuations. This improves the accuracy and stability of resistance alloy 1, ensuring stable circuit performance. Furthermore, its high resistivity allows for higher resistance values ​​to be achieved within a smaller size and volume, meeting the needs of various circuits for high-resistance resistors and facilitating the miniaturization of electronic devices. Compared to some precious metals or special alloys, the raw material cost of copper-manganese alloy is relatively low, which is beneficial for cost reduction and efficiency improvement.

[0031] Resistance alloy 1 and copper strip 2 are connected by high-energy electron beam welding.

[0032] High-energy electron beam welding is a welding method that utilizes the heat energy generated by bombarding the workpiece with an accelerated and focused electron beam. When welding resistance alloy 1 and copper strip 2, the high energy density of the electron beam enables the interface between the two materials to melt rapidly, forming a strong metallurgical bond. Due to the highly concentrated energy of the electron beam, the heat-affected zone during welding is small, effectively reducing the impact on the performance of resistance alloy 1 and preventing significant changes in resistance value due to overheating.

[0033] Mounting holes 4 are provided on the aluminum strip 3.

[0034] Working Principle: Resistance alloy 1 is made of copper-manganese alloy, which has a low temperature coefficient of resistance, maintaining a stable resistance value and ensuring stable circuit performance. Its high resistivity is beneficial for miniaturization of electronic devices, while its low raw material cost reduces costs and increases efficiency. Resistance alloy 1 is connected to copper strip 2 by high-energy electron beam welding. The concentrated electron beam energy and small heat-affected zone minimize the impact on the performance of resistance alloy 1. Copper strip 2 and aluminum strip 3 are tightly connected by an interference fit of connecting strip 5 and connecting groove 6. Conductive adhesive is used to enhance conductivity and connection strength. Simultaneously, a hot-melt composite process is used to allow copper strip 2 and aluminum strip 3 to interpenetrate and fuse during heating and melting, forming a strong bonding layer after cooling, solving the welding problem between copper and aluminum. Finally, resistance alloy 1, copper strip 2, and aluminum strip 3 constitute a composite strip, ensuring stable electrical performance while achieving lightweight design, thus achieving the goal of cost reduction and efficiency improvement.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite strip structure of copper-aluminium and resistive alloy comprising a resistive alloy (1), characterised in that: Copper strips (2) are provided on both the left and right sides of the resistance alloy (1). Aluminum strips (3) are provided on the side of the two copper strips (2) away from the resistance alloy (1). Several sets of connecting strips (5) are provided on the side of the copper strips (2) away from the resistance alloy (1). Several sets of connecting grooves (6) matching the connecting strips (5) are opened on the aluminum strips (3).

2. The composite strip structure of copper-aluminum and resistance alloy according to claim 1, characterized in that: The connecting strip (5) and the connecting groove (6) are interference fit, and the connecting part is filled with conductive adhesive.

3. The composite strip structure of copper-aluminum and resistance alloy of claim 1, wherein: The copper strip (2) and the aluminum strip (3) are combined by a hot melt composite process.

4. The composite strip structure of copper-aluminum and resistance alloy of claim 1, wherein: The resistance alloy (1) is made of copper-manganese alloy.

5. The composite strip structure of copper-aluminum and resistance alloy of claim 1, wherein: The resistance alloy (1) and the copper strip (2) are connected by high-energy electron beam welding.

6. The composite strip structure of copper-aluminum and resistance alloy of claim 1, wherein: The aluminum strip (3) has mounting holes (4).

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