JP2014229570A - Terminal member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal member exhibiting excellent fastening force of a terminal pin and a collector plate.SOLUTION: One or a plurality of notches 21b, 21c are formed at the opening edge of a through hole 21a provided in a collector plate 21, and then a terminal pin 22 is inserted into the through hole 21a and caulked, so that a plastically deformed terminal pin 22 bites into the notches 21b, 21c thus fixing the collector plate 21 and terminal pin 22. Since the notches 21b, 21c are formed at the opening edge of the through hole 21a, fastening force in the rotation direction is enhanced significantly, thus ensuring excellent looseness prevention of the terminal pin 22 in bus bar connection.

Description

The present invention relates to a terminal member in a storage battery such as a lithium ion battery or an electric double layer capacitor.

Conventionally, in storage batteries, a rod-shaped terminal pin is press-fitted into a through-hole provided in the current collector plate, or by crimping the terminal pin and the current collector plate. The technique is disclosed in Patent Document 1 and is publicly known. Usually, the terminal pin is often formed into a terminal bolt having a thread, and this is because the bus bar and the terminal bolt are fixed with a nut and a plurality of storage batteries are electrically connected. .

JP 2010-97818 A

However, in the terminal member, due to the rotational load torque when the bus bar is connected, the terminal bolt is loosened, the conductivity becomes unstable, and the terminal bolt is detached from the through hole of the current collector plate. It was.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a terminal member having excellent fastening force between a terminal pin and a current collector plate.

One or a plurality of notches are provided at the opening edge of the through hole provided in the current collector plate, and the terminal pin is bitten into the notch by inserting and crimping the terminal pin into the through hole. By the terminal member of the structure which fixes a board and a terminal pin.

Moreover, it is preferable that the notch provided in the said current collecting plate is shape | molded in the shape of a triangular pyramid.

The caulking is preferably performed by a spinning caulking method.

According to the terminal member of the present invention, since the terminal pin plastically deformed during caulking bites into the notch, the fastening force between the terminal pin and the current collector plate is improved. For this reason, since the secular change is suppressed about the contact resistance of a terminal pin and a current collecting plate, the stable electroconductivity can be exhibited. Moreover, since the notch is provided at the opening edge of the through hole, the fastening force in the rotation direction is remarkably improved, and the terminal pin is prevented from loosening in the bus bar connection.

In addition, by forming the notch provided in the current collector plate into a triangular pyramid shape, the terminal pins that are plastically deformed during caulking are filled without any gaps in the entire notch, so that the fastening force is further improved. .

In addition, since the terminal pin which was plastically deformed at the time of caulking becomes easy to flow into the notch portion by using the caulking method as spinning caulking, caulking failure (crimping failure) is reduced.

Sectional drawing which shows the whole structure of a lithium ion battery. Sectional drawing which shows the structure of a terminal member. FIG. 3 shows only the current collector plate of the terminal member, where (a) is a bottom view of FIG. 2 and (b) is a cross-sectional view taken along line AA of (a). The figure which shows the crimping state by spin crimping.

Hereinafter, the overall configuration of a battery according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view showing the overall configuration of a battery having terminal members 10 and 20 according to an embodiment of the present invention. The battery 1 is a general box-type lithium ion battery, and includes a housing 2, a power generation element 3, terminal members 10 and 20, and the like. Moreover, the housing | casing 2 is comprised by the cover part 2a and the case 2b, and electrolyte solution is enclosed with the inside of this housing | casing 2 as a lithium ion conductor.

The power generation element 3 includes, for example, a sheet-like negative electrode foil (not shown) that is a copper foil coated with a lithium ion compound and the like, and a sheet-shaped positive electrode foil (not shown) that is an aluminum foil coated with a carbon material or the like. And a sheet-like separator (not shown), etc., and a member formed by winding each member into a cylindrical shape with the separator interposed between the negative electrode foil and the positive electrode foil. . Then, one end of the wiring 4 and the wiring 5 is connected to the negative electrode foil and the positive electrode foil of the power generation element 3. Terminal members 10 and 20 are connected to the other ends of the wiring 4 and the wiring 5.

The terminal members 10 and 20 are a negative electrode side terminal member (hereinafter referred to as a negative electrode terminal member) 10 mainly made of copper and a positive electrode side terminal member (hereinafter positive electrode terminal) mainly made of aluminum. However, since the negative electrode terminal member 10 and the positive electrode terminal member 20 have the same structure, in the description of the structure of these terminal members 10 and 20, the positive electrode terminal member 20 is For example, the same reference numerals as those of the positive electrode terminal member 20 are attached to the components of the negative electrode terminal member 10.

As shown in FIGS. 1 and 2, the positive electrode terminal member 20 has an end 22 a of a terminal pin 22 fixed to a current collecting plate 21 disposed inside the housing 2, thereby collecting the current collecting plate. 21 and the terminal pin 22 are integrated. Further, a sealing member 23 is fitted in the hole 2c of the lid portion 2a, and the terminal pin 22 is disposed in a state where the sealing member 23 is interposed between the hole 2c and the terminal pin 22. . The seal member 23 electrically insulates the lid 2a from the terminal pins 22 and the current collector plate 21 and prevents leakage of the electrolyte sealed in the housing 2. Further, the seal member 23 is configured to be divided by an outer member 23a and an inner member 23b, respectively, so that the seal member 23 can be easily attached to the hole 2c.

The terminal pin 22 of the positive electrode terminal member 20 is a substantially columnar bolt member having a thread formed on the outer periphery except for the end portion 22a, and a bus bar (not shown) is connected to a nut (not shown). By fixing with, it is possible to electrically connect a plurality of lithium ion batteries. On the other hand, a through hole 21a is formed in the current collector plate 21 of the positive electrode terminal member 20, and the end 22a of the terminal pin 22 is inserted into the through hole 21a. Then, the terminal pin 22 and the current collector plate 21 are fixed by caulking the end 22a as an example of caulking.

As shown in FIG. 3, the current collector plate 21 has a notch 21b, 21c at the opening edge of the through hole 21a as a structure for fixing the terminal pin 22 and the current collector plate 21 by the spinning caulking. It is formed, and a high fastening force can be obtained by biting the end 22a of the terminal pin 22 here. Further, as shown in FIG. 4, spinning caulking is performed using a spin caulking machine 30, and the end 22 a is pressed while rotating the punch 31 by pressing the end 22 a of the terminal pin 22 from the end surface with the punch 31. Pressurized and deformed. In spinning caulking, the end portion 22a of the terminal pin 22 is plastically deformed in the diameter increasing direction, but the notches 21b and 21c are arranged in the diameter increasing direction, so that the end portion 22a of the terminal pin 22 is cut. It is easy to flow into the notches 21b and 21c. Further, as shown in FIGS. 3A and 3B, the notches 21b and 21c are formed in a triangular pyramid shape, and the opening outline of the notches 21b and 21c has a V-shaped outline. Molded. For this reason, the volume of the notches 21b and 21c decreases as the distance from the opening edge decreases, and the end 22a of the plastically deformed terminal pin 22 fills the entire interior of the notches 21b and 21c without any gaps. High fastening force can be obtained. In addition, even if the number of notches is not two but one, three, or four, a suitable fastening force can be exhibited.

As described above, according to the positive electrode terminal member 20 of the present invention, the fastening force between the electrode pin 22 and the current collector plate 21 is improved, so that the contact resistance between the terminal pin 22 and the current collector plate 21 changes with time. Therefore, stable conductivity can be exhibited. Further, since the notches 21b and 21c are formed at the opening edge of the through hole 21a, the fastening force in the rotation direction is remarkably improved, and the loosening prevention in the bus bar connection is excellent. In the drawings, FIGS. 1 and 2 show a state in which the terminal pins 22 are not crimped for convenience, and FIG. 3 shows a configuration of the current collector plate 21 with the terminal pins 33 omitted.

DESCRIPTION OF SYMBOLS 1 Battery 2 Case 2a Cover part 2b Case 3 Electric power generation element 4,5 Wiring 10 Negative electrode terminal member 20 Positive electrode terminal member 21 Current collecting plate 21a Through-hole 21b, 21c Notch part 22 Terminal pin 22a End part 23 Seal member 23a Outer member 23b Inner member 30 Spin caulking machine 31 Punch

Claims (3)

One or a plurality of notches are provided at the opening edge of the through hole provided in the current collector plate, and the terminal pin is bitten into the notch by inserting and crimping the terminal pin into the through hole, thereby collecting the current collector plate. A terminal member characterized by a structure for fixing the terminal pin and the terminal pin. The terminal member according to claim 1, wherein the notch portion of the current collector plate is formed in a triangular pyramid shape. The terminal member according to claim 1, wherein the caulking is performed by spinning caulking.

Images