CN100452555C - Battery terminal connector and conductive piece thereof - Google Patents

Abstract

The invention discloses a battery terminal connector (1) and a conductive piece thereof, wherein the battery terminal connector (1) is provided with an electric insulation sleeve piece (11) and a conductive piece (12/13), and a groove cavity (111) is formed on the electric insulation sleeve piece (11) for accommodating the conductive piece (12/13). Two terminal connection parts (12a & 12B/13a & 13B) arranged at a distance extend from the conductive member (12/13), each terminal connection part (12a, 12B/13a, 13B) comprises two wave-shaped pieces (121/131) with open ends facing to the A direction and a wave-shaped piece (122/132) with open ends facing to the B direction, a specific angle theta is formed between the A direction and the B direction, 0 & lttheta & lt 90, and each wave-shaped piece (121, 122, 121/131, 132, 131) is formed with a bending part (1211, 1221, 1211/1311, 1321, 1311), and a gap with a vertical distance (D) smaller than the thickness (D) of the battery terminal (21) is formed between the bending part (1221/1321) of the wave-shaped piece (122/132) with the open end of each terminal connecting part facing to the B direction and the bending part (1211/1321) of the wave-shaped piece (121/131) with the open end facing to the A direction.

Description

Battery terminal connector and its conductive parts

technical field

The invention relates to a connector, in particular to a battery terminal connector for coupling battery terminals when batteries are connected in series and a conductive part thereof.

Background technique

An uninterrupted power system (Uninterrupted Power System; UPS) is an emergency power supply device that supplies a power system. The main structure is a battery, which is usually kept in a fully charged state. When the uninterruptible power system detects that the AC power supply (Alternating Current; AC) is out of power or the voltage is abnormal, it will switch to the battery power supply in a very short time, allowing the user to buy some buffer time to avoid damage to the power system . Therefore, it is necessary for the user to increase the battery power of the UPS, and the usual practice is to connect the batteries in series.

A battery terminal 21 of a known uninterruptible power supply system is formed by bending a metal sheet. The appearance can be referred to as shown in FIG. 2 , and a through hole 213 is formed thereon. Usually the method of connecting two batteries in series is to connect one end of a wire with wire terminals 7 as shown in Figure 12 to the positive terminal on one battery and connect the other end of the wire to the negative terminal on the other battery. However, the wire terminal 7 shown in FIG. 12 is likely to be unable to be smoothly coupled with the battery terminal 21 due to slight deformation of the battery terminal 21 , and has the problem of insufficient clamping force.

Contents of the invention

The technical problem to be solved by the present invention is to propose a new battery terminal connector and its conductive parts, so that users can easily and smoothly connect two batteries in series even when the battery terminals are slightly deformed, so as to improve the known The foregoing drawbacks of the method of connecting batteries in series by coupling the terminals of the batteries with wire terminals.

Another technical problem to be solved by the present invention is to provide a battery terminal connector capable of forming a firm coupling with the battery terminal and its conductive member.

The technical solution of the present invention is: a battery terminal connector, which includes a conductive member and an electrical insulating sleeve, and two first terminal connection parts and second terminal connection parts arranged at a distance extend from the conductive part; the The electrical insulating sleeve is formed with a groove to accommodate the conductive part; wherein each terminal connection part includes three adjacent corrugated sheets, each corrugated sheet is formed with a bending part, and the open end of the centered corrugated sheet of each terminal connection part faces to the The open ends of the corrugated sheets located at other positions are directed at a specific angle; a gap is formed between the bent parts of the corrugated sheets at each terminal connection part, and the vertical distance of the gap is less than the thickness of a battery terminal.

The present invention also proposes a battery terminal connector, which includes a conductive member and an electrical insulating sleeve, and two first terminal connecting parts and a second terminal connecting part that are arranged at a distance extend from the conductive member; the electrical insulating sleeve forms There is a groove for accommodating the conductive part; wherein, each terminal connection part includes three adjacently arranged corrugated sheets, each corrugated sheet forms a bent part, and the open end of the centered corrugated sheet of each terminal connection part faces and is located at another position The open end of the corrugated sheet faces a specific angle; a gap is formed between the bent parts of the corrugated sheets of each terminal connection part, and the vertical distance of the gap is less than the thickness of a battery terminal; the centered wave shape of the first terminal connection part The opening end of the sheet faces the specific angle between the open end of the central wave sheet of the second terminal connection part; the width of the bending part of the center wave sheet between the first terminal connection part and the second terminal connection part It is smaller than the width of the bending part of other corrugated sheets.

The present invention also proposes a conductive part of a battery terminal connector, which includes two first terminal connecting parts and a second terminal connecting part arranged at a distance, wherein each terminal connecting part includes three adjacently arranged corrugated sheets, each corrugated A bending part is formed on the sheet, and the open end of the wave sheet in the center faces a specific angle with the open end of the wave sheet located at other positions; a gap is formed between the bending parts of the wave sheet at each terminal connection part, and the gap The vertical distance is less than the thickness of a battery terminal.

The present invention also proposes a battery terminal connector, comprising a conductive member and an electrical insulating sleeve, a first terminal connecting portion and a second terminal connecting portion extending from the conductive member, the electrical insulating sleeve is formed with a groove, To accommodate the conductive member; wherein: each terminal connection part has two first wave pieces and a second wave piece, the second wave piece is interposed between the first wave pieces, the first wave form of each terminal connection part The orientation of the open end of the sheet is the same, the orientation of the open end of the second corrugated sheet and the orientation of the open end of the first corrugated sheet form a specific angle, the waveforms of the first corrugated sheet and the second corrugated sheet are the same, Each first corrugated sheet is formed with a bent portion, and the second corrugated sheet is formed with a bent portion. The protrusion of the bent portion of the first corrugated sheet of each terminal connection portion is located on the same plane, and is aligned with the second corrugated sheet. A gap is formed between the protrusions of the bent portion of the sheet, and the vertical distance of the gap is less than the thickness of a battery terminal; The orientations of the open ends of the second corrugated sheets are the same.

The present invention also proposes a battery terminal connector, comprising a conductive member and an electrical insulating sleeve, a first terminal connecting portion and a second terminal connecting portion extending from the conductive member; the electrical insulating sleeve is formed with a groove, To accommodate the conductive member; wherein: each terminal connection part has two first wave pieces and a second wave piece, and the second wave piece is interposed between the first wave pieces; the first wave piece of each terminal connection part The open end of a corrugated sheet faces the same direction, and there is a specific angle between the orientation of the open end of the second corrugated sheet and the orientation of the open end of the first corrugated sheet; each first corrugated sheet forms a bent portion, and the first corrugated sheet The two corrugated sheets form a bent portion; the protrusions of the bent portion of the first corrugated sheet of each terminal connection portion are located on the same plane, and form a gap with the protruding portion of the bent portion of the second corrugated sheet. a gap; and the orientation of the open end of the second corrugated sheet of the first terminal connection part and the orientation of the open end of the second corrugated sheet of the second terminal connection part form the specific angle.

The present invention also proposes a battery terminal connector, which includes a conductive part and an electrical insulating sleeve, a first terminal connecting part and a second terminal connecting part extend from the conductive part, and the electrical insulating sleeve forms a groove for accommodating Place the conductive member; wherein: each terminal connection part has two first wave plates and a second wave plate, and the second wave plate is interposed between the first wave plates; the first wave plate of each terminal connection part The open ends face the same direction, and a specific angle is formed between the orientation of the open end of the second corrugated sheet and the orientation of the open end of the first corrugated sheet; each first corrugated sheet forms a bending portion, and the second corrugated sheet forms There is a bending part; the protrusion of the bending part of the first corrugated sheet of each terminal connection part is located on the same plane, and forms a gap with the protrusion of the bending part of the second corrugated sheet; and the first The direction of the open end of the second corrugated sheet of a terminal connection part and the direction of the open end of the second corrugated sheet of the second terminal connection part form the specific angle, and the bending part of the first corrugated sheet of each terminal connection part A misalignment is formed with the bending portion of the second corrugated sheet in the transverse direction.

The present invention provides an electrical insulation kit for a battery terminal connector, wherein the electrical insulation kit includes: a groove for accommodating a conductive member; a T-shaped recess formed on a first portion of the electrical insulation kit surface; a plurality of first ribs formed on the first surface, a second surface adjacent to the first surface and a third surface opposite to the first surface and adjacent to the second surface; a plurality second ribs formed on the first surface, the third surface and a fourth surface adjacent to the first surface and opposite to the second surface; and a plurality of third ribs formed on the T-shaped recess In addition, the intersection of any surface of the groove and the surface forms a chamfered R angle.

In one embodiment, the open end of the wave plate located in the middle of one terminal connection portion faces the same direction as the open end of the wave plate located in the middle position of the other terminal connection portion.

In another embodiment, the open end of the corrugated sheet at the middle position of one terminal connection part faces a specific angle with the open end of the corrugated sheet at the middle position of the other terminal connection part, which is the same as the first direction described later. Angle with the second direction. In addition, the width of the bent part of the corrugated sheet at the middle position of each terminal connection part is smaller than the width of the bent part of the corrugated sheet at other positions, and the bent part of the corrugated sheet at the middle position is different from the corrugated part at other positions. The bent portion of the sheet forms an offset in the transverse direction.

The characteristics and advantages of the present invention are: the battery terminal connector of the present invention has an electrical insulating sleeve and a conductive piece, and a groove is formed on the electrical insulating sleeve to accommodate the conductive piece. Two terminal connecting parts arranged at a distance are extended from the conductive member, and each terminal connecting part includes two corrugated plates with open ends facing a first direction and a corrugated plate with open ends facing a second direction, the distance between the first direction and the second direction A specific angle is sandwiched between each corrugated sheet, and a bent portion is formed on each corrugated sheet, and a vertical distance less than The gap of the thickness of the battery terminal.

The above-mentioned battery terminal connector and conductive member can easily achieve the purpose of firmly coupling with the battery terminal according to the slight deformation of the battery terminal. Compared with the known battery terminal connector and conductive member, the present invention has the advantages of convenient installation and greater clamping force The advantages. In addition, the present invention can also be applied to other types of battery couplings besides being applicable to the battery coupling of the uninterruptible power supply system, such as the storage battery for locomotives.

Description of drawings

FIG. 1 is a schematic diagram showing a situation in which a battery terminal connector of the present invention is sleeved on a battery terminal to connect two batteries in series.

FIG. 2 is a schematic diagram showing the battery terminals of FIG. 1 .

FIG. 3 is a perspective view showing an electrical insulation kit of a battery terminal connector according to an embodiment of the present invention.

FIG. 4 is a front view showing the electrical isolation kit of FIG. 3 .

FIG. 5 is a schematic diagram showing conductive elements of a battery terminal connector according to an embodiment of the present invention.

FIG. 6A is a side view showing the conductive member structure of the battery terminal connector according to an embodiment of the present invention.

FIG. 6B is a front view showing the conductive member structure of the battery terminal connector according to an embodiment of the present invention.

FIG. 7 is a side view showing the geometric relationship between the conductive member of FIG. 6A and a battery terminal.

FIG. 8 is a side view showing the connection relationship between the conductive member of FIG. 6A and a battery terminal.

FIG. 9A is a side view showing the structure of the conductive member of the battery terminal connector according to another embodiment of the present invention.

FIG. 9B is a front view showing the conductive member structure of the battery terminal connector according to another embodiment of the present invention.

FIG. 10 is a side view showing the geometric relationship between the conductive member of FIG. 9A and a battery terminal.

FIG. 11 is a side view showing the connection relationship between the conductive member of FIG. 9A and a battery terminal.

Fig. 12 is a schematic view showing a known wire terminal.

FIG. 13 is a perspective view showing an electrical insulation kit of a battery terminal connector according to another embodiment of the present invention.

FIG. 14A is a front view showing the electrical insulation sleeve of the battery terminal connector of FIG. 13. FIG.

FIG. 14B is a top view showing the electrical insulation sleeve of the battery terminal connector of FIG. 13 .

14C is a side view showing the electrical isolation sleeve of the battery terminal connector of FIG. 13 .

Description of main component symbols:

1. Battery terminal connector 11, 11a, electrical insulation kit

111, 111a, groove 112a, T-shaped concave part

113a, 114a, ribs 115a, chamfered R angle

12, 13, conductive parts 12a, 12b, 13a, 13b, terminal connection part

121, 122, 131, 132, wave plate 1211, 1221, 1311, 1321, bending part

2. Battery 21. Battery terminal

211. Upper surface 212. Lower surface

213. Through hole 7. Wire terminal

A, B, C, direction

Detailed ways

The present invention will be described more fully below in conjunction with specific embodiments with reference to the accompanying drawings.

Please refer to FIG. 1 , the battery terminal connector 1 of the present invention forms a coupling with the battery terminals 21 respectively located on the batteries 2 of two uninterruptible equipments. As shown in FIG. 2 , the battery terminal 21 of the battery 2 of the above uninterruptible equipment is formed by bending a metal sheet, and a through hole 213 is formed on the battery terminal 21 .

3 to 7, a battery terminal connector 1 according to an embodiment of the present invention includes an electrical insulating sleeve 11 and a conductive member 12, wherein the electrical insulating sleeve 11 has a groove 111 for accommodating the conductive member 12, Two terminal connection parts 12a and 12b arranged at a distance are formed on the conductive member 12. The structure of the electrical insulation kit 11 is shown in FIGS. 3 and 4, and the structure of the conductive member 12 is shown in FIGS. 5, 6A and 6B. .

As shown in Figures 5 to 7, each terminal connection portion 12a or 12b on the conductive member 12 is formed by a wave plate 121 with two open ends facing the direction A as shown in the figure and an open end facing the direction B as shown in the figure. The corrugated sheets 122 are arranged adjacent to each other, the corrugated sheets 122 are interposed between the two corrugated sheets 121, and the three corrugated sheets have the same waveform. There is a specific angle θ between the direction A and the direction B, and the angle is between 0° and 90°, and both the A direction and the B direction are perpendicular to the length direction C of the conductive member 12 . In addition, the open end of the corrugated plate 122 of the terminal connecting portion 12 a faces the same direction as the open end of the corrugated plate 122 of the terminal connecting portion 12 b, both facing the B direction.

On the other hand, bent portions 1211 and 1221 are respectively formed on the corrugated pieces 121 and 122 of each terminal connecting portion 12a or 12b, and the protrusions of the two bent portions 1211 are located on the same plane, and are aligned with the bent portion 1221. A gap is formed between the protrusions, and the vertical distance d of the gap is smaller than the thickness D of the battery terminal 21 . Please refer to FIG. 8, when the terminal connecting parts 12a and 12b on the conductive member 12 are respectively coupled with the battery terminals 21 of the two batteries to be connected in series, the bent parts 1211 of the two corrugated pieces 121 of the terminal connecting part 12a are connected to the first The lower surface 212 of the battery terminal 21 is in contact, and the bent portion 1221 of the corrugated sheet 122 of the terminal connection portion 12a is in contact with the upper surface 211 of the first battery terminal 21; The lower surface 212 of the second battery terminal 21 is in contact, and the bent portion 1221 of the corrugated piece 122 of the terminal connection portion 12b is in contact with the upper surface 211 of the second battery terminal 21, thereby clamping the battery terminal 21 between the two corrugated pieces 121 and the second battery terminal 21. Between the corrugated sheets 122.

Please refer to FIG. 9A, FIG. 9B and FIG. 10. In another embodiment of the present invention, the aforementioned conductive element 12 can be replaced by a conductive element 13, and two terminal connection parts 13a and 13b arranged at a distance are formed on the conductive element 13. Each terminal connection part 13a and 13b on the conductive member 13 is composed of two corrugated sheets 131 with open ends facing the direction A as shown in the figure and a corrugated sheet 132 with one open end facing the direction B as shown in the figure. The wave plate 132 is interposed between the two wave plates 131, and the three wave plates have the same wave form. There is a specific angle θ between the direction A and the direction B, and the angle is between 0° and 90°, and both the A direction and the B direction are perpendicular to the length direction C of the conductive member 13 . In addition, the open end orientation of the corrugated sheet 132 of the terminal connection portion 13a and the open end orientation of the corrugated sheet 132 of the terminal connection portion 13b form a specific angle, which is the same as the aforementioned angle θ between the A direction and the B direction, that is, the terminal The open end of the corrugated sheet 132 of the connecting portion 13 a faces the aforementioned direction B, and the open end of the corrugated sheet 132 of the terminal connecting portion 13 b faces the aforementioned A direction.

On the other hand, bent portions 1311 and 1321 are respectively formed on the corrugated pieces 131 and 132 of each terminal connecting portion 13a and 13b, and the protrusions of the two bent portions 1311 are located on the same plane, and are aligned with the bent portion 1321. A gap is formed between the protrusions, and the vertical distance d of the gap is smaller than the thickness D of the battery terminal 21 . In addition, the width of the bent portion 1321 is smaller than the width of the bent portion 1311, and the bent portion 1311 and the bent portion 1321 form a dislocation in the lateral direction with a dislocation distance e, that is, as shown in FIGS. The case where the portion 1311 is behind and the bent portion 1321 is in front. In this way, as shown in FIG. 11 , when each terminal connection portion 13a and 13b on the conductive member 13 is respectively coupled to the battery terminals 21 of the two batteries to be connected in series, the bends of the two corrugated pieces 131 of the terminal connection portion 13a The bent portion 1311 is in contact with the lower surface 212 of the first battery terminal 21, and the bent portion 1321 of the corrugated sheet 132 of the terminal connecting portion 13a falls into the through hole 213 of the first battery terminal 21; while the two corrugated portions of the terminal connecting portion 13b The bent portion 1311 of the sheet 131 is in contact with the upper surface 211 of the second battery terminal 21, while the bent portion 1321 of the corrugated sheet 132 of the terminal connection portion 13b falls into the through hole 213 of the second battery terminal 21, thus the The two battery terminals 21 are clamped.

Referring to FIG. 13 , FIG. 14A , FIG. 14B and FIG. 14C , the electrical insulation sleeve 11 a of the battery terminal connector 1 according to another embodiment of the present invention has a groove 111 a for accommodating the conductive member 13 . In addition, a T-shaped recess 112a is formed on the upper surface of the electrical insulation sleeve 11a to reduce the use of plastic when the electrical insulation sleeve 11a is injection-molded, and a plurality of straight ribs 113a are formed on the electrical insulation sleeve 11a to reinforce the plastic Insufficient strength caused by the reduction. On the other hand, a plurality of ㄇ-shaped ribs are also formed on the upper surface, the two side surfaces adjacent to it, and the lower surface opposite to the upper surface to strengthen the structural strength of the electrical insulation sleeve 11a, that is, a plurality of ㄇ The font-shaped ribs are formed on the upper surface, the right side surface and the lower surface, and a plurality of ㄇ-shaped ribs are formed on the upper surface, the left side surface and the lower surface. In addition, in order to prevent the stress concentration caused by the injection molding of the electrical insulating sleeve 11a, a fillet curve 115a is provided at the junction of any surface of the cavity 11a.

Furthermore, in order to match the two terminal connection portions 13a and 13b with different orientations of the conductive member 13 of the second embodiment of the present invention, the groove 11a can be designed to have a first area for accommodating the terminal connection portion 13a and an accommodating The second area of the terminal connection portion 13b is arranged, and the cross-sectional shape of the first area is designed to be the same in size and opposite in direction to the cross-sectional shape of the second area.

Above, the present invention has been clearly described by various embodiments and related drawings. However, those skilled in the art should understand that the various embodiments of the present invention are only illustrative and not restrictive, that is, without departing from the concept and scope of the present invention, the above-mentioned Variations and modifications of each component are covered by the present invention. For example, the shape of the above-mentioned corrugated piece is not limited to a waveform but can be a zigzag similar to a waveform. Therefore, the present invention is defined by the appended claims.

Claims (9)

1. a battery terminal connector comprises an electric-conductor and an electric insulation external member, extends two on this electric-conductor and is separated by one apart from the first terminal connecting portion and the second terminal connecting portion that dispose; This electric insulation external member is formed with a groove cave, with ccontaining this electric-conductor; It is characterized in that:

Each terminal connecting portion comprises the corrugated sheet of three adjacent configurations, forms kink on each corrugated sheet, the open end of the corrugated sheet placed in the middle of each terminal connecting portion towards with the open end of the corrugated sheet that is positioned at other positions towards folder one special angle; Form a gap between the kink of the corrugated sheet of each terminal connecting portion, the vertical range in this gap is less than the thickness of a battery terminal.

2. a battery terminal connector comprises an electric-conductor and an electric insulation external member, extends two on this electric-conductor and is separated by one apart from the first terminal connecting portion and the second terminal connecting portion that dispose; This electric insulation external member is formed with a groove cave, with ccontaining this electric-conductor; It is characterized in that:

Each terminal connecting portion comprises the corrugated sheet of three adjacent configurations, forms kink on each corrugated sheet, the open end of the corrugated sheet placed in the middle of each terminal connecting portion towards with the open end of the corrugated sheet that is positioned at other positions towards folder one special angle; Form a gap between the kink of the corrugated sheet of each terminal connecting portion, the vertical range in this gap is less than the thickness of a battery terminal; The open end of the corrugated sheet placed in the middle of this first terminal connecting portion towards and the open end of the corrugated sheet placed in the middle of this second terminal connecting portion towards between this special angle of folder; The width of the kink of the corrugated sheet placed in the middle of this first terminal connecting portion and this second terminal connecting portion is less than the width of the kink of other corrugated sheet.

3. the electric-conductor of a battery terminal connector comprises two and is separated by one apart from the first terminal connecting portion and the second terminal connecting portion that dispose, it is characterized in that:

Each terminal connecting portion comprises the corrugated sheet of three adjacent configurations, forms kink on each corrugated sheet, the open end of corrugated sheet placed in the middle towards with the open end of the corrugated sheet that is positioned at other positions towards folder one special angle; Form a gap between the kink of the corrugated sheet of each terminal connecting portion, the vertical range in this gap is less than the thickness of a battery terminal.

4. the electric-conductor of battery terminal connector as claimed in claim 3 is characterized in that: the open end of the corrugated sheet placed in the middle of this first terminal connecting portion towards and the open end of the corrugated sheet placed in the middle of this second terminal connecting portion towards between be folded with this special angle.

5. the electric-conductor of battery terminal connector as claimed in claim 4, it is characterized in that: the width of the kink of the corrugated sheet placed in the middle of this first terminal connecting portion and this second terminal connecting portion is less than the width of the kink of other corrugated sheet.

6. a battery terminal connector comprises an electric-conductor and an electric insulation external member, extends a first terminal connecting portion and one second terminal connecting portion on this electric-conductor, and this electric insulation external member is formed with a groove cave, with ccontaining this electric-conductor; It is characterized in that:

Each terminal connecting portion has two first corrugated sheet and one second corrugated sheet, this second corrugated sheet is between described first corrugated sheet, the open end of first corrugated sheet of each terminal connecting portion towards identical, the open end of this second corrugated sheet towards and the open end of described first corrugated sheet towards between folder one special angle, the waveform of described first corrugated sheet and this second corrugated sheet is identical, each first corrugated sheet is formed with a kink, this second corrugated sheet is formed with a kink, the high spot of the kink of first corrugated sheet of each terminal connecting portion is in the same plane, and and forming a gap between the high spot of the kink of this second corrugated sheet, the vertical range in this gap is less than the thickness of a battery terminal; And

The open end of second corrugated sheet of this first terminal connecting portion towards with the open end of second corrugated sheet of this second terminal connecting portion towards identical.

7. a battery terminal connector comprises an electric-conductor and an electric insulation external member, extends a first terminal connecting portion and one second terminal connecting portion on this electric-conductor; This electric insulation external member is formed with a groove cave, with ccontaining this electric-conductor; It is characterized in that:

Each terminal connecting portion has two first corrugated sheet and one second corrugated sheet, and this second corrugated sheet is between described first corrugated sheet; The open end of described first corrugated sheet of each terminal connecting portion in the same direction, the open end of this second corrugated sheet towards and the open end of described first corrugated sheet towards between folder one special angle; Each first corrugated sheet is formed with a kink, and this second corrugated sheet is formed with a kink; The high spot of the kink of first corrugated sheet of each terminal connecting portion is in the same plane, and and the high spot of the kink of this second corrugated sheet between form a gap; And

The open end of second corrugated sheet of this first terminal connecting portion towards and the open end of second corrugated sheet of this second terminal connecting portion towards between this special angle of folder.

8. battery terminal connector as claimed in claim 7 is characterized in that: the width of the kink of second corrugated sheet of each terminal connecting portion is less than the width of the kink of first corrugated sheet.

9. a battery terminal connector comprises an electric-conductor and an electric insulation external member, extends a first terminal connecting portion and one second terminal connecting portion on the electric-conductor, and the electric insulation external member is formed with a groove cave, with ccontaining this electric-conductor; It is characterized in that:

Each terminal connecting portion has two first corrugated sheet and one second corrugated sheet, and this second corrugated sheet is between described first corrugated sheet; The open end of first corrugated sheet of each terminal connecting portion in the same direction, the open end of this second corrugated sheet towards and the open end of described first corrugated sheet towards between folder one special angle; Each first corrugated sheet is formed with a kink, and this second corrugated sheet is formed with a kink; The high spot of the kink of first corrugated sheet of each terminal connecting portion is in the same plane, and and the high spot of the kink of second corrugated sheet between form a gap; And

The open end of second corrugated sheet of this first terminal connecting portion towards and the open end of second corrugated sheet of this second terminal connecting portion towards between this special angle of folder, and the kink of the kink of first corrugated sheet of each terminal connecting portion and second corrugated sheet forms a dislocation in a lateral direction.

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