Aluminum row connecting piece for battery

Abstract

The utility model relates to the field of electric connecting pieces, and discloses an aluminum row connecting piece for a battery, which comprises a 6101 aluminum alloy substrate used as a conductor for bearing current; the outer surface of the 6101 aluminum alloy substrate is coated with the film-state insulating layer, and the film-state insulating layer is a polyimide insulating film formed by high-temperature curing after being coated with a polyimide solution; and the electroplated layers are plated on the surfaces of the two ends of the 6101 aluminum alloy substrate. According to the utility model, the effects of greatly reducing cost and weight are realized, and electroplating is carried out on the 6101 aluminum alloy substrate, so that the anti-oxidation effect is better, the thickness of the insulating layer is thinner, the problem that the connecting piece for the battery is easily oxidized in an aerobic environment is effectively solved, and the problems that the resistance of aluminum is increased compared with that of copper, and the service life of the connecting piece is prolonged are solved. The invention aims to solve the problems that a larger cross section needs to be increased to meet the design over-current requirement and the internal space of a battery needs to be thinner for the thickness of an insulating layer of an aluminum conducting bar to meet the space requirement, and the 6101 aluminum alloy substrate coated with a polyimide insulating film has a better anti-oxidation effect.

Description

Technical Field

[0001] The present application relates to the field of electrical connectors, and in particular to an aluminum busbar connector for batteries. Background Art

[0002] Battery electrical connectors are conductors used to carry current between components in a battery circuit. Their primary function is to ensure electrical connections between battery cells, between battery terminals and battery pack terminals, and between battery pack terminals and external circuits and auxiliary devices. Aluminum busbars are used as battery connectors due to their excellent electrical conductivity. Their light weight, high strength, and excellent electrical conductivity make them an ideal material for battery connections. Aluminum busbars are typically machined into specific shapes through cutting, bending, and other processes to meet the connection requirements of different battery modules.

[0003] However, in the process of implementing relevant technical solutions, at least the following technical problems were found: the aluminum busbar is an aluminum electrical connector, and its material is soft. The locking bolts at the electrical connection are compressed and deformed, resulting in torque attenuation and increased contact internal resistance, which may cause battery system failure or natural problems. In addition, the oxidation problem of the aluminum busbar has always existed. As an electrical connector, the oxidation problem of the aluminum busbar needs to be solved urgently. Utility Model Content

[0004] The present application solves the technical problems of oxidation of aluminum bars and increased internal resistance in the prior art by providing an aluminum bar connector for batteries, thereby reducing oxidation of the aluminum bars, reducing increased internal resistance, and reducing the thickness of the aluminum bars.

[0005] The present application provides an aluminum busbar connector for a battery, comprising: a 6101 aluminum alloy substrate serving as a current-carrying conductor; a film-like insulating layer coating the outer surface of the 6101 aluminum alloy substrate; and an electroplating layer plated on the surfaces of both ends of the 6101 aluminum alloy substrate.

[0006] Furthermore, the electroplating layer is a tin-plated layer formed after metal surface treatment.

[0007] Furthermore, the electroplated layer is a nickel-plated layer formed after metal surface treatment.

[0008] Furthermore, the film-like insulating layer is a polyimide insulating film formed by coating a polyimide solution and then curing it at a high temperature.

[0009] Furthermore, the thickness of the polyimide insulating film formed by coating the polyimide solution and then curing at high temperature is 0.1 mm to 0.25 mm.

[0010] Furthermore, the length of the film-like insulating layer is shorter than the length of the aluminum bar connector, both ends of the aluminum bar connector extend out of the film-like insulating layer, and the extended ends of the aluminum bar connector are both provided with connecting holes.

[0011] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0012] 1: 6101 aluminum alloy substrate is used as the battery connector, and copper refining and processing consumes more energy than aluminum, which achieves significant cost and weight reduction.

[0013] 2: Since aluminum has a higher resistance than copper, a larger cross-section is required to meet the design overcurrent requirements, and the internal space of the battery requires a thinner insulation layer of the aluminum conductive bus to meet the space requirements. In this application, a polyimide insulating film with a thickness of only 0.1mm-0.25mm is formed after polyimide solution coating and high-temperature curing. This can achieve a thinner insulating film to solve the space requirement problem caused by the large cross-sectional design area of ​​the aluminum bus.

[0014] 3: Electroplating on 6101 aluminum alloy substrate can achieve better anti-oxidation effect, effectively solving the problem that battery connectors are easily oxidized in an aerobic environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the layer structure of an aluminum busbar connector for a battery in an embodiment of the present application;

[0016] Figure 2 This is a schematic structural diagram of an aluminum busbar connector for a battery in an embodiment of the present application;

[0017] In the figure: 101, 6101 aluminum alloy substrate; 102, film-state insulation layer; 103, electroplating layer; 1, aluminum busbar connector; 11, connection hole. DETAILED DESCRIPTION

[0018] An embodiment of the present application discloses an aluminum busbar connector for a battery. By coating a polyimide insulating film on a 6101 aluminum alloy substrate and performing tin or nickel plating, the anti-oxidation effect can be improved and the insulation layer thickness can be thinner, effectively solving the problem that battery connectors are easily oxidized in an aerobic environment, and solving the problem that since aluminum has greater resistance than copper, a larger cross-section needs to be added to meet the designed overcurrent requirements, and the internal space of the battery requires a thinner insulation layer thickness for the aluminum conductive bus to meet space requirements.

[0019] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0020] Reference Figure 1A battery aluminum busbar connector includes a 6101 aluminum alloy substrate 101, a film-like insulating layer 102, and an electroplating layer 103. The 6101 aluminum alloy substrate 101 is a basic conductor that carries current. The film-like insulating layer 102 is a protective film that covers the outer surface of the 6101 aluminum alloy substrate 101. The electroplating layer 102 is plated on the surfaces of both ends of the 6101 aluminum alloy substrate 101. Figure 2 As shown, the length of the film-state insulating layer 102 is smaller than the length of the aluminum busbar connector 1 , and both ends of the aluminum busbar connector 1 extend out of the film-state insulating layer 102 . Both extended ends of the aluminum busbar connector are provided with connection holes 11 .

[0021] 6101 aluminum alloy is a high-strength, non-heat-treatable aluminum alloy with excellent electrical conductivity and welding properties. Its chemical composition mainly includes aluminum (Al), magnesium (Mg), silicon (Si), iron (Fe), copper (Cu), manganese (Mn), chromium (Cr), zinc (Zn), boron (B), titanium (Ti), etc. Among them, magnesium and silicon are the main alloying elements, which respectively give the alloy strength and improve its processing properties. Based on these two characteristics, the aluminum busbar connector 1 based on the 6101 aluminum alloy substrate 101 has high tensile strength and good ductility. In addition, according to different heat treatment states, the yield strength and tensile strength of the 101 aluminum alloy substrate 101 can vary within a certain range to meet different application requirements.

[0022] The film-like insulating layer 102 is an insulating film formed by high-temperature curing after coating with a polyimide solution. The thickness of the polyimide insulating film formed by high-temperature curing after coating with a polyimide solution is 0.1 mm to 0.25 mm. The polyimide insulating film is usually prepared by a solution polycondensation method. The formation process is usually to first use diamine and dianhydride as monomer raw materials for a polycondensation reaction to form a polyimide acid (PAA) prepolymer solution. Then, the polyimide acid (PAA) solution is coated on the 6101 aluminum alloy substrate 101 that has been electroplated. It is subjected to an imidization reaction by heat treatment and converted into the final polyimide insulating film. The polyimide insulating film has excellent heat resistance, electrical insulation performance, and chemical stability. Coating the 6101 aluminum alloy substrate 101 with a polyimide insulating film can make the anti-oxidation effect better.

[0023] The electroplating layer 103 can be a tin-plated layer or a nickel-plated layer formed after metal surface treatment. Nickel plating can form a layer of nickel on the outer surface of the ends of the aluminum busbar connector 1, while tin plating can form a layer of tin on the outer surface of the ends of the aluminum busbar connector 1. Regardless of whether it is nickel-plated or tin-plated, this electroplating layer 103 can block oxygen and water vapor, preventing the 6101 aluminum alloy substrate from reacting with the external environment and corroding, especially in humid environments containing salt spray or chemically corrosive gases, and effectively prevents oxidation in oxygen-containing environments. In addition, the nickel-plated or tin-plated electroplating layer can improve the electrical conductivity and thermal conductivity of the connector, thereby improving the heat dissipation capacity of the aluminum busbar to a certain extent, especially in applications with high current density.

[0024] In summary, since the 6101 aluminum alloy substrate 101 is used as a battery connector, and copper refining and processing consumes more energy than aluminum, a significant cost and weight reduction effect is achieved. In addition, the polyimide insulating film coated on the 6101 aluminum alloy substrate 101 can achieve a better anti-oxidation effect, effectively solving the problem that battery connectors are easily oxidized in an aerobic environment. In addition, since aluminum has a higher resistance than copper, a larger cross-section is required to meet the design overcurrent requirements, and the internal space of the battery requires a thinner insulation layer thickness for the aluminum conductive bus to meet space requirements. In this application, an insulating film with a thickness of only 0.1mm-0.25mm is formed after polyimide liquid coating and high-temperature curing. This can achieve a thinner insulating film to solve the problem of space requirements caused by the large cross-sectional design area of ​​the aluminum bus.

[0025] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

[0026] The above is only a preferred specific implementation method of the embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and concept of the present application within the technical scope disclosed in the present application, and they should be covered by the scope of protection of the present application.

Claims

1. A battery aluminum busbar connector, characterized in that: include: 6101 aluminum alloy substrate (101), serving as a conductor for carrying current; A film-like insulating layer (102) is coated on the outer surface of the 6101 aluminum alloy substrate (101); The electroplating layer (103) is plated on the surfaces of both ends of the 6101 aluminum alloy substrate (101).

2. The aluminum busbar connector for a battery according to claim 1, wherein: The electroplating layer (103) is a tin-plated layer formed after metal surface treatment.

3. The aluminum busbar connector for a battery according to claim 2, wherein: The electroplating layer (103) is a nickel-plated layer formed after metal surface treatment.

4. The aluminum busbar connector for a battery according to claim 1, wherein: The film-like insulating layer (102) is a polyimide insulating film formed by coating a polyimide solution and then curing it at a high temperature.

5. The aluminum busbar connector for a battery as claimed in claim 4, characterized in that: The thickness of the polyimide insulating film formed by coating the polyimide solution and then curing at high temperature is 0.1mm-0.25mm.

6. The aluminum busbar connector for a battery according to claim 1, wherein: The length of the film-like insulating layer (102) is smaller than the length of the aluminum bar connector (1), both ends of the aluminum bar connector (1) extend out of the film-like insulating layer (102), and the extended ends of the aluminum bar connector (1) are both provided with connection holes (11).

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