JPH0864195A - Battery terminal structure for electric automobile - Google Patents

Abstract

PURPOSE: To enhance conductivity between terminals by fastening the contact surface of a terminal to be fastened with almost constant surface pressure against the contact surface of a battery terminal. CONSTITUTION: Rigidity of a brass terminal 11 on the fastened side is increased and the surface 12 to be fastened of the terminal 11 is tapered so as to incline at an angle of about 1 deg. downward from the center to the periphery, and the brass terminal 11 is fastened to a lead terminal 25 with a bolt 21 and a nut 24. The tapered surface 12 of the brass terminal 11 is deformed in flat against the contact surface 27 of the lead terminal 25 so as to come in pressure contact with almost uniform surface pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery terminal structure for an electric vehicle.

[0002]

2. Description of the Related Art FIG. 2 shows a structure of a conventional terminal structure of a battery for an electric vehicle. In FIG. 2, 2
1 is a bolt, 22 is its head, and 23 is its shaft. 24 is an S-shaped nut. Reference numeral 25 is a lead terminal that serves as a battery terminal of an electric vehicle battery, and 26 is a brass terminal on the tightened side. Holes 29, 30 are provided.

Next, assembling of both terminals 25 and 26 in the above conventional terminal structure will be described with reference to FIG. In FIG. 2, with respect to the contact surface 27 of the lead terminal 25,
The contact surfaces 28 of the brass terminals 26 are made to face each other and the respective bolt insertion holes 29, 30 are aligned. And the bolt 21
The shaft portion 23 is inserted from the bolt insertion hole 29 of the lead terminal 25, the bolt insertion hole 30 of the brass terminal 26 is inserted, and the S-shaped nut 24 is screwed to the tip thereof and tightened.

As described above, in the above-mentioned conventional terminal structure for an electric vehicle battery, the flat contact surface 27 of the lead terminal 25 and the flat contact surface 27 of the brass terminal 26 on the tightened side are opposed to each other. The bolts 21 and the nuts 24 are tightened to bring them into contact with each other.

[0005]

However, in the above-mentioned conventional terminal structure of the battery for the electric vehicle, the planar contact surface of the battery (lead) terminal has a planar shape of the (brass) terminal on the tightened side. Match the contacted surfaces,
Although it is fastened at first glance because it is tightened with bolts and nuts, the contact surface pressure of the terminal on the tightened side against the battery terminal is actually extremely high on the shaft side,
The contact surface of the terminal on the tightened side is deformed due to the sudden decrease in the outer peripheral direction, and the outer peripheral part floats and the battery terminal is not contacted.As a result, the contact area of each terminal Has a problem that heat is generated because of small resistance and large resistance. This is an important issue because a large current flows in the terminal of the battery for the electric vehicle, and an effective solution is awaited.

The present invention solves such a conventional problem, and the contact surface of the terminal on the tightened side is assembled and brought into contact with the contact surface of the battery terminal at a substantially constant surface pressure, An object of the present invention is to provide a terminal structure for an electric vehicle battery that can improve conductivity between terminals.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a contact surface of a terminal to be tightened in a direction from the center to the outer circumference in accordance with Young's modulus of a metal material used for the terminal. It is formed in a taper shape that is inclined downward at a predetermined angle.

[0008]

Therefore, according to the present invention, with the above structure, when the contact surface of the terminal to be tightened is aligned with the contact surface of the battery terminal and tightened by the bolt, the contact surface of the battery terminal is pressed by the pressing. On the other hand, the tapered contact surface of the terminal on the tightened side is deformed and assembled into a substantially uniform flat surface, and the entire contact surface comes into contact with the contact surface at a substantially constant surface pressure.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of the present invention. In addition, in FIG. 1, the same members as those in the related art are shown with the same reference numerals. That is, 21 is a hexagon bolt, 22 is its head, and 23 is its shaft. 24 is an S-shaped nut. Reference numeral 25 denotes a lead terminal which serves as a battery terminal of a battery for an electric vehicle, a contact surface 27 of which is formed in a flat shape, and a bolt insertion hole 29 is provided at a central portion.

In FIG. 1 (a), reference numeral 11 denotes a brass terminal to be clamped to a battery terminal, which has a thickness greater than that of a conventional one to enhance rigidity, and the contacted surface 12 side extends from the center toward the outer peripheral direction. It is formed in a tapered shape with an angle of 1 ° and is inclined downward, and a bolt insertion hole 13 is provided in the central portion thereof. The inclination angle of the tapered contact surface 12 is calculated from the Young's modulus of the material of the brass terminal 11.

Next, the assembling of the terminals 25 and 11 in the terminal structure of the battery for the electric vehicle will be described with reference to FIG. In FIG. 1 (a), first,
Align the contact surface 12 of the brass terminal 11 on the tightened side with the contact surface 27 of the lead terminal 25, and insert each bolt insertion hole 2
9 and 13 are opposed to each other, and the shaft portion 23 of the bolt 21 is connected to the lead terminal 2
5 through the bolt insertion hole 29 of the brass terminal 11 is inserted into the bolt insertion hole 13 of the brass terminal 11, and the S-shaped nut 24 is screwed to the tip thereof. Then, as shown in FIG. 1B, the nut 2
When 4 is tightened, the tapered contact surface 12 of the brass terminal 11 is deformed into a flat surface with respect to the contact surface 27 of the lead terminal 25 due to the pressing force of the bolt 21 and the nut 24, and the center side thereof. The entire area from the outer circumference to the outer circumference is pressed in a substantially uniform manner.

As described above, according to the above-described embodiment, the brass terminal 11 on the tightened side has a higher rigidity, and the contacted surface 12 is tapered downward from the center of the contacted surface 12 at an angle of about 1 °. And the brass terminal 11 is fastened to the lead terminal 25 with the bolt 21 and the nut 24, thereby deforming the contacted surface 12 of the brass terminal 11 into a flat shape with respect to the contact surface 27 of the lead terminal 25. Since the pressure contact is made with a substantially uniform surface pressure, the entire contact surface 12 of the brass terminal 11 can be assembled to the contact surface 27 of the lead terminal 25 with a substantially constant contact surface pressure. Therefore, each terminal 25, 11
It is possible to increase the contact area between them and improve the conductivity.

In this embodiment, the terminal on the tightened side is illustrated as a brass terminal, but the present invention is not limited to this, and various metal terminals can be similarly applied to obtain the same effect. Obtainable.

[0014]

As described above, according to the terminal structure of the battery for the electric vehicle of the present invention, the contact surface of the terminal on the tightened side is centered according to the Young's modulus of the metal material used for the terminal. The taper of the tightened side to the contact surface of the battery terminal is formed by tapering the terminal on the tightened side to the battery terminal with a bolt. The contact surface of the terminal is deformed into a flat shape so that the contact surface of the battery terminal is contacted almost evenly. The conductivity between the terminals can be improved.

[Brief description of drawings]

FIG. 1A is a front sectional view of a terminal structure of a battery for an electric vehicle according to an embodiment of the present invention. FIG. 1B is a front view showing an assembled state of each terminal in the structure.

FIG. 2 is a front view of a conventional terminal structure of a battery for an electric vehicle.

[Explanation of symbols]

 11 Brass Terminal (Terminal on Tightened Side) 12 Contacted Surface 13 Bolt Insertion Hole 21 Bolt 22 Head 23 Shaft 24 Nut 25 Lead Terminal (Battery Terminal) 27 Contact Surface 29 Bolt Insertion Hole

Claims (1)

[Claims] 1. A terminal structure for an electric vehicle battery, comprising a battery terminal for an electric vehicle battery, wherein terminals made of various metal materials are assembled and brought into contact with each other by tightening bolts as terminals to be tightened. The terminal structure of the battery for an electric vehicle, wherein the contacted surface of the terminal is formed in a taper shape that is inclined downward at a predetermined angle from the center toward the outer peripheral direction according to the Young's modulus of the metal material used for the terminal. .