JP2003346778A - Battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery that prevents an excessive force from being inflicted on the connection fixing part between a rivet terminal and can maintain airtightness inside the battery case made of a battery box and a lid plate, by preventing rotation and floating of a terminal plate. <P>SOLUTION: The battery comprises a rivet terminal 7 that protrudes to the outside of the lid plate 4, an upper insulating sealing plate 6 that is arranged on the outer face of this lid plate 4 and has penetrated the rivet terminal 7 in a through hole, a terminal plate 8 that is arranged on the upper insulating sealing plate 6 and has inserted the top end cylindrical part 7c of the rivet terminal 7 into an insertion hole and connected by fixing. A plurality of stud bolts 11 are provided on the lid plate 4 and a depressing material 10 is arranged so as to be positioned on the upper insulating sealing plate 6 through these stud bolts 11. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a battery for fixing a terminal block via stud bolts protruding from a battery case.

[0002]

2. Description of the Related Art FIG. 1 shows an example of the configuration of a large non-aqueous electrolyte secondary battery used in electric vehicles and the like. This non-aqueous electrolyte secondary battery is a battery in which four long cylindrical wound power generating elements 1 are closely arranged and connected in parallel. These power generating elements 1
The positive and negative electrodes are respectively connected and fixed to the current collecting connectors 2 disposed on both end faces. The current collection connector 2 is made of an aluminum plate on the positive electrode side and a copper plate on the negative electrode side, and is shaped like a blind from the bottom of a horizontally disposed substantially isosceles triangular plate-shaped body. The positive electrode or the negative electrode of the power generating element 1 is connected and fixed to the connecting portion protruding from. The plate-shaped main bodies of the current collecting connector 2 are disposed at both ends of the back surface of the cover plate 4 via the lower insulating sealing plate 3. The cover plate 4 is made of a rectangular stainless steel plate,
It is fitted into the upper end opening of the battery case 5 which is a stainless steel container for housing the power generating element 1 and is fixed by welding. The cover plate 4 and the battery housing 5 constitute a battery case of the non-aqueous electrolyte secondary battery.

[0005] Terminals are arranged at both ends of the upper surface of the cover plate 4 via upper insulating sealing plates 6 respectively. The terminal is made of a metal material made of aluminum on the positive electrode side and made of copper on the negative electrode side, and is composed of a rivet terminal 7, a terminal block 8 and a terminal bolt 9, respectively. As shown in FIG. 2, the upper insulating sealing plate 6 is a rectangular plate made of insulating PPS (polyphenylene sulfide) resin or the like, and has an octagonal concave portion 6a formed at one end of the upper surface. On the other end side, a rectangular recess 6b is formed. In the center of the bottom surface of the octagonal concave portion 6a, a through hole penetrating the back surface is formed. The rivet terminal 7
A cylindrical lower end tubular portion 7b is projected from the lower surface of the octagonal flange portion 7a, and a cylindrical upper end tubular portion 7c is projected from the upper surface of the flange portion 7a.
The terminal block 8 has a rectangular plate shape smaller than the upper insulating sealing plate 6, and has a fitting hole 8a formed at one end and a through hole 8b formed at the other end. The terminal bolt 9 is a hexagonal bolt having a bolt portion projecting upward from the upper surface of the hexagonal head.

[0004] Upper insulating sealing plates 6 are arranged at both ends of the upper surface of the lid plate 4. Openings 4 a are formed at both ends of the upper surface of the cover plate 4, and the upper insulating sealing plate 6 is arranged so that the through-hole of the upper insulating sealing plate 6 is located directly above the openings 4 a. The rivet terminal 7 has the lower end cylindrical portion 7 b fitted into the opening 4 a of the cover plate 4 through the through hole of the upper insulating sealing plate 6, and the current collecting connector 2 disposed on the back surface of the cover plate 4. It is connected and fixed to the plate-shaped main body by caulking. At this time, rotation of the rivet terminal 7 with respect to the upper insulating sealing plate 6 is regulated by fitting the square-shaped flange portion 7a of the rivet terminal 7 into the rectangular recess 6a of the upper insulating sealing plate 6. You.
The terminal bolt 9 also has its hexagonal head fitted into the hexagonal hexagonal recess 6 b of the upper insulating sealing plate 6, thereby restricting rotation with respect to the upper insulating sealing plate 6.
Then, by fitting the fitting hole 8a and the through hole 8b of the terminal block 8 from above into the upper cylindrical portion 7c of the rivet terminal 7 and the bolt portion of the terminal bolt 9, the terminal block 8 is insulated from the upper part. It is arranged on the upper surface of the stop plate 6 and connected and fixed by caulking the upper end cylindrical portion 7c to the terminal block 8.
Thereby, the electrode of the power generation element 1 is connected and fixed to the terminal block 8 from the current collector 2 via the rivet terminal 7, and
The upper insulating sealing plate 6 is pressed and held between the cover plate 4 and the terminal block 8, so that the space between the opening 4a of the cover plate 4 and the rivet terminal 7 can be reliably sealed. Also, terminal bolt 9
Is restricted in rotation by the hexagonal recess 6b of the upper insulating sealing plate 6 and is prevented from coming out upward by the terminal block 8. Therefore, for example, a crimp terminal of a power cord is fitted into the bolt portion and a nut or the like is used. By tightening and fixing, the external device and the terminal block 8 can be reliably connected via the power cord.

[0005]

However, in the terminal structure including the rivet terminal 7, the terminal block 8, and the terminal bolt 9, a large force is applied to the terminal bolt 9 when the power cord of the external device is attached or detached. However, the caulking between the upper end cylindrical portion 7c of the rivet terminal 7 and the terminal block 8 is loosened, and the airtightness inside the battery case may be deteriorated. That is, for example, when a large force is applied with a tool or the like to tighten a nut or the like to a bolt portion of the terminal bolt 9,
A large torque is applied to the terminal block 8 so that the crimping portion of the rivet terminal 7 with the upper end cylindrical portion 7c idles, or the terminal block 8 is lifted up with the upper end cylindrical portion 7c as a fulcrum, and the crimping portion is peeled off. Therefore, the force for pressing the upper insulating sealing plate 6 is weakened, and the airtightness is reduced. Particularly, in the nonaqueous electrolyte secondary battery, the rivet terminals 7 and the like on the positive electrode side are made of aluminum having a low strength.
When an excessive force is actually applied to the swaged portion, the airtightness of the battery case is likely to be impaired.

The present invention has been made in order to cope with such a situation, and by preventing rotation and lifting of a terminal block, it is possible to prevent an excessive force from being applied to a connection fixing portion between the terminal body. It is another object of the present invention to provide a battery capable of maintaining airtightness inside a battery case.

[0007]

According to a first aspect of the present invention, there is provided a terminal body protruding outside a battery case, and an insulating sealing material disposed on an outer surface of the battery case and having the terminal body penetrated through a through hole. And a terminal block arranged on the insulating sealing material and fixedly connected by fitting the protruding end of the terminal body into the fitting hole.

A battery is characterized in that a plurality of stud bolts are protruded from a battery case, and a holding member is arranged on the insulating sealing material by the stud bolts.

According to the first aspect of the present invention, since the terminal pressing member presses the terminal block provided on the insulating sealing material from above through the plurality of stud bolts, the terminal block is lifted and rotated. Can be suppressed. Therefore, the connection between the protruding end of the terminal body and the terminal block is not loosened and the airtightness in the battery case is not reduced.

The invention according to claim 2 is the battery according to claim 1, wherein the pressing member is made of an insulating material.

According to the second aspect of the present invention, since the pressing member is an insulating material, the insulation of the battery terminal can be ensured, and short-circuiting or the like during battery handling can be prevented. Become.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows an embodiment of the present invention and is a partially enlarged perspective view in which a terminal portion of a non-aqueous electrolyte secondary battery is enlarged.

As shown in FIG. 3, a positive electrode terminal of the non-aqueous electrolyte secondary battery has a rivet terminal 7 (see FIG. 3) disposed on an upper surface of a cover plate 4 via an upper insulating sealing plate 6 (insulating sealing material). (Terminal body), a terminal block 8 and terminal bolts 9. In the present embodiment, the holding member 10 is disposed on the terminal block 8. The holding member 10 is formed of a rectangular resin plate having through holes formed at four corners. The holding member 10 is fixed by a nut 12 or the like via a stud bolt 11 projecting from the battery cover plate.

The non-aqueous electrolyte secondary battery is connected to an external device by, for example, fitting a crimp terminal crimped to an end of a power cord to a terminal bolt 9 and screwing it with a nut.
At this time, the terminal bolt 9 is subjected to a strong force by a tool for tightening the nut, and the terminal block 8 is lifted or rotated. However, in the present embodiment, since the pressing member 10 presses the terminal block 8 from above, the terminal block 8 is lifted up with the rivet terminal 7 side as a fulcrum, and the crimping portion with the rivet terminal 7 is impossible. No force is applied. In addition, even when the terminal block 8 receives a force in the rotating direction, the pressing of the pressing member 10 prevents the terminal block 8 from rotating around the rivet terminal 7 side to apply an excessive force to the caulked portion. can do.

As a result, according to the present embodiment, even when a large force is applied to the terminal bolt 9 when attaching or detaching the terminal bolt 9 to or from an external device, the terminal bolt 9 cannot be crimped between the terminal block 8 and the rivet terminal 7. Since it is possible to prevent excessive force from being applied, the airtightness in the battery case is not impaired.

As a result, according to the present embodiment, even if a large force is applied to the terminal bolt 9 when attaching or detaching the terminal bolt 9 to or from an external device, the terminal bolt 9 cannot be crimped between the terminal block 8 and the rivet terminal 7. Since it is possible to prevent excessive force from being applied, the airtightness in the battery case is not impaired.

In the above embodiment, the case where the terminal bolt 9 is used for connection to an external device has been described.
The external device may be directly connected to the terminal block 8 or may be connected to the terminal block 8 by fixing or locking a connecting member other than the terminal bolt 9 to the terminal block 8.

Further, the shapes of the upper insulating sealing plate 6, the rivet terminal 7, and the terminal block 8 shown in the above embodiment are merely examples, and any shape and structure can be used. For example, the rivet terminal 7 must have a flange 7a
, And the upper end cylindrical portion 7c does not need to be cylindrical. Further, in the above-described embodiment, the case where the upper end tubular portion 7c of the rivet terminal 7 is swaged to the terminal block 8 has been described. However, the connection can be fixed by a method other than swaging such as welding.

In the above embodiment, the positive electrode terminal of the non-aqueous electrolyte secondary battery has been described. However, the present invention can be similarly applied to a negative electrode terminal made of copper having higher strength than aluminum, and the material of the terminal is limited. Not done. Further, in the above embodiment, a large non-aqueous electrolyte secondary battery has been described, but the present invention can be similarly applied to other types of batteries having the same terminal structure.

In the above-described embodiment, four long cylindrical wound power generating elements 1 are arranged in close contact with each other and connected in parallel. The quantity is not limited to four pieces.

[0022]

As is apparent from the above description, according to the battery of the present invention, it is possible to prevent the terminal block from being lifted up or rotated, so that the connection between the projecting end of the terminal body and the terminal block is fixed. And the airtightness inside the battery case is not reduced. Further, by using an insulating material for the pressing member, it is possible to ensure the insulation of the battery terminal portion.

[Brief description of the drawings]

FIG. 1, which shows a conventional embodiment, is an exploded perspective view showing a structure of a non-aqueous electrolyte secondary battery.

FIG. 2, which shows a conventional embodiment, is a partially enlarged perspective view in which a positive electrode terminal portion of a nonaqueous electrolyte secondary battery is enlarged.

FIG. 3, showing an embodiment of the present invention, is a partially enlarged perspective view in which a positive electrode terminal portion of a nonaqueous electrolyte secondary battery is enlarged.

[Explanation of symbols]

1 Power generation element 2 Current collector 3 Lower insulating sealing plate 4 lid plate 4a Opening hole 5 Battery case 6 Upper insulating sealing plate 6a Octagon recess 7 Rivet terminals 7a Flange part 7b Lower end tubular part 7c upper end cylindrical part 8 Terminal block 9 Terminal bolt 10 Holding material 11 Stud bolt 12 nuts

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Tetsuzo Kojima             Kyoto, Minami-ku, Kyoto             No. 1 Inside Japan Battery Co., Ltd. (72) Inventor Kunyo Munaga             Kyoto, Minami-ku, Kyoto             No. 1 Inside Japan Battery Co., Ltd. (72) Inventor Taketo Matsubara             Kyoto, Minami-ku, Kyoto             No. 1 Inside Japan Battery Co., Ltd. F term (reference) 5H022 AA09 BB03 CC02 CC09 KK04                 5H028 AA05 CC05 CC21

Claims (2)

[Claims] 1. A terminal body protruding outside of a battery case, an insulating sealing material disposed on an outer surface of the battery case and having a through hole penetrating the terminal body, and disposed on the insulating sealing material. In a battery provided with a terminal block in which the protruding end of the terminal body is fitted and fitted in the fitting hole, a plurality of stud bolts are protruded from the battery case, and the holding member is insulated and sealed through the stud bolts. A battery which is arranged so as to be located on a stopper. 2. The battery according to claim 1, wherein the pressing member is made of an insulating material.