JP2001093488A - Battery - Google Patents

Abstract

(57) Abstract: One end of a lead (19) is welded to the back of a sealing material (18), and the lead (19) is attached to one end of an electrode housed in a case (11).
Of the sealing material 1 in the case 11 by pressing the other end of the sealing material.
In the battery 10 to which the battery 8 is attached, the sealing material 18 is a cladding material 52 whose back side is the same material as the lead 19. In addition, the cladding material is provided with an annular groove 51 which functions as a safety valve by cutting off a bulging portion protruding to the front side and finishing the front side flat. [Effect] Since the connection is made via the clad material, there is no contact between metals, the structure can be simplified, the number of parts can be reduced, and the electric resistance can be reduced. It is easy to set the pressure of the safety valve provided on the clad material, and it is easy to form the safety valve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to the structure of a battery lid.

[0002]

2. Description of the Related Art FIGS. 6A and 6B are explanatory views of a conventional battery. (A) shows a partial cross section of a battery,
Is a case 101, a positive electrode plate 102, a negative electrode plate 103, and an electrolytic solution 104 housed in the case 101, a current collector 106 attached to the positive electrode plate 102, and an explosion-proof It is composed of a valve 107 and a cover 108 superimposed on the explosion-proof valve 107.

FIG. 1B is a perspective view of a current collector, an explosion-proof valve, and a cover. The current collector 106 is an aluminum plate,
This is a donut plate formed with an outer diameter D and an inner diameter d. Explosion-proof valve 1
Reference numeral 07 denotes an aluminum foil, which is a safety valve formed to have an outer diameter D. The cover 108 includes a positive electrode terminal 111 and a small pressure release hole 112 formed on a side surface of the positive electrode terminal 111. The material is nickel. Current collector 106
By sandwiching the thin film explosion-proof valve 107 between the cover and the cover 108, the explosion-proof valve 107 can be securely attached to the case.

[0004]

However, the current collector 106
The explosion-proof valve 107 is placed on the
8 are stacked and sandwiched and attached to the case 101, so that the structure is complicated and the number of parts increases. Further, since the explosion-proof valve 107 is superimposed on the current collector 106 and the cover 108 is superimposed on the explosion-proof valve 107 and the respective surfaces are brought into contact by caulking, the electric resistance between the current collector 106, the explosion-proof valve 107 and the cover 108 is increased. Is big.

Therefore, an object of the present invention is to provide a simple structure,
An object of the present invention is to provide a battery having low electric resistance.

[0006]

In order to achieve the above object, a first aspect of the present invention is to weld one end of a lead, which is a conductive material, to the back of a sealing material, and to connect the other end of the electrode housed in a case to the other end of the lead. In a battery in which a sealing material is attached in a case such that an end thereof is pressed, the sealing material is a clad material whose back side is made of the same material as the lead.

Since the back side of the sealing material is a clad material of the same material as the lead, welding of the lead is easy. Since the case is sealed only with the integrated sealing material, the structure is simple and the number of parts is small. In addition, since they are joined by the clad material and welding, there is no contact resistance and the electric resistance is small.

A second aspect of the present invention is to seal the cladding material by bending a V-shaped annular groove by pressing the cladding material from the back side to the front side, cutting off a protruding portion protruding to the front side, and flattening the front side. The stop member is provided with an annular groove acting as a safety valve. Cut off the protruding part protruding to the front side,
Finish the front side flat while leaving the back side material of a predetermined thickness. Since the predetermined thickness of the annular groove is formed only of the material on the back side, the pressure of the safety valve in the clad material can be easily set. Further, since the sealing member is provided with the annular groove serving as a safety valve, there is no need to provide a special safety valve, and the structure is simpler and the number of parts is smaller.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory view of a battery according to the present invention. A battery 10 is connected to a case 11, a positive electrode 12, a negative electrode 13, a separator 14, an electrolytic solution 15 contained in the case 11, and a positive electrode 12. Positive lead 16
And a gasket 17 adhered to the case 11, and a sealing material 18 mounted in the case 11 via the gasket 17.
And a lead 19 having one end welded to the back of the sealing material 18.
And a positive electrode terminal 21 welded to the surface of the sealing material 18.

The case 11 has a bottom 31 and a negative electrode wall 32.
And an opening 33 and a caulking portion 34 formed in the vicinity of the opening 33. The positive electrode 12 is a strip-shaped current collector 4.
1 and the active materials 42, 4 applied to both sides of the current collector 41.
Consists of two.

The negative electrode 13 includes a band-shaped current collector 45 and active materials 46, 46 applied to both surfaces of the current collector 45. The separator 14 separates the positive electrode 12 and the negative electrode 13, prevents short circuit between the two electrodes, and allows ions to pass therethrough.

The electrolyte 15 transports (conducts) ions between the positive electrode 12 and the negative electrode 13 during charging and discharging, and is a solution prepared by dissolving a solute with a solvent to a predetermined viscosity (ratio). It is a system electrolyte. The gasket 17 insulates and seals the positive and negative electrodes.

Next, an example of the manufacturing method will be described. First,
In the step of obtaining the positive electrode active material 42, the positive electrode active material, the conductive agent, and the binder are mixed to form a slurry. In the step of obtaining the positive electrode 12, slurry is applied to both sides of the belt-like current collector 41, dried, and the thickness of the positive electrode 12 is made constant by a press machine.

Subsequently, in the step of obtaining the negative electrode active material 46, the negative electrode active material and the binder are mixed to form a slurry.
In the step of obtaining the negative electrode 13, slurry is applied to both sides of the belt-shaped current collector 45, dried, and the thickness of the negative electrode 13 is made constant by a press machine.

A separator 14 is placed on the positive electrode 12, a negative electrode 13 is placed on the separator 14, a separator 14 is placed on the negative electrode 13, and spirally wound to a predetermined hardness. Disconnect. A negative electrode lead 48 having a disk shape is welded to the wound negative electrode 13. Next, the material wound around the case 11 is placed, and the negative lead 48 is welded to the bottom 31 of the case 11. Thereafter, the electrolyte 15 is placed under a reduced pressure atmosphere.
And return to atmospheric pressure.

Finally, a positive electrode lead 16 is welded to the positive electrode 12, a gasket 17 is bonded to the case 11, a lead 19 is connected to the positive electrode lead 16, and a sealing material is attached to the case 11 via the gasket 17. We caulk 18.

FIG. 2 is a perspective view of a sealing material according to the present invention. The sealing material 18 is a clad material 52 having an annular groove 51 formed in the center of a circular plate. The clad material 52 is made of the top plate 5
3 and the material of the back plate 54 are different. Top plate 5
The material of No. 3 is the same material as the positive electrode terminal 21, for example,
Nickel. The material of the back plate 54 is the same material as the lead 19, for example, aluminum or copper.

The lead 19 has a weld 56 formed at one end.
And a connecting portion 57 formed at the other end. Lead 19
Is aluminum or copper. If aluminum is used, the electric conductivity is large, the electric resistance can be reduced, and the weight of the battery can be reduced. Copper is expensive (about 1.5 times that of aluminum).
Times), the specific gravity is large (compared to aluminum), but the electric conductivity is larger than aluminum, and the electric resistance can be made smaller.

The positive electrode terminal 21 includes a leg 61 and the leg 6
1 and a terminal portion 63 formed on the upper portion of the leg portion 61. The material of the positive electrode terminal 21 is nickel. Nickel is expensive (about 4.5 times as much as aluminum), but is suitable for also serving as a protective cover because of its relatively high electrical conductivity and excellent mechanical properties.

The positive electrode terminal 21 is provided on the front plate 53 of the clad material 52.
Of the lead 19 is welded to the back plate 54 of the clad material 52 as shown by the arrow.

FIGS. 3A to 3D are first explanatory views of the method for manufacturing a sealing material according to the present invention. (A): First, the front plate 53 (for example, nickel) and the back plate 5
4 (for example, aluminum) bonded clad material 52
Is prepared (or manufactured), and the sealing material 18 having the outer diameter D is cut off from the clad material 52 with a processing machine (laser or the like).

(B): Next, the sealing material 18 is transported to the press machine 67, and the front plate 53 of the sealing material 18 is directed upward at a predetermined position of the mold 71 (the upper mold 72 and the lower mold 73). It is set and the upper mold 72 is lowered as indicated by an arrow under predetermined conditions. Upper mold 72
Are formed with a die 74 having a V-shaped annular groove, and the lower die 73 is formed with a punch 75 having a V-shaped annular convex portion.

(C): Subsequently, the annular groove 51 having a V section is bent and formed by the die 74 and the punch 75 of the press machine 67 from the back side to the front side of the clad material 52 (sealing material 18). A protruding bulged portion 76 is formed. (D): After forming the bulging portion 76, the upper mold 72 is raised as shown by the arrow, the sealing material 18 is taken out, and transported to the next grinding step.

FIGS. 4A and 4B are second explanatory views of the method for manufacturing a sealing material according to the present invention. (A): The sealing material 18 is set on the table 78 of the grinding machine 77 (the bulging portion 76 faces upward), and the grindstone 79 is fed under predetermined conditions as indicated by arrows.

(B): The protruding portion protruding toward the front plate 53 is cut off with a grindstone 79 to finish the front plate 53 side flat, and at the same time, leave the back plate 54 (for example, aluminum) by the thickness t. Thus, an annular groove 51 acting as a safety valve is formed in the sealing member 18.

The operation of the battery described above will now be described.
FIG. 5 is an operation diagram of the battery according to the present invention. Clad material 5
Since the front plate 53 of No. 2 is made of the same material (for example, nickel) as the positive electrode terminal 21, it is easy to weld the positive electrode terminal 21 to the sealing member 18 as shown by the arrow. Similarly, the clad material 52
Since the back plate 54 is made of the same material (aluminum) as the lead 19, it is easy to weld the lead 19 to the sealing material 18 as shown by the arrow. Also, the positive electrode side inside the case and the positive electrode terminal 21 outside the case are connected via a cladding material 52,
In addition, since the connection is made by welding, the electric resistance is reduced.

Further, the front plate 53 is made of the same material as the positive electrode terminal 21, and the back plate 54 is made of the same material as the leads 19. Since the sealing material 18 is formed of the clad material 52 in which the front plate 53 and the back plate 54 of such a material are joined, it is possible to improve the conductivity of the battery, reduce the weight, and secure the strength of the protective cover. At the same time, the case is sealed with the clad material 52, so that the airtightness is improved. As a result, the structure can be simplified and the number of parts can be reduced.

In addition, the bulging portion protruding to the front side of the clad material 52 is cut off to finish the front side flat, and the back plate 54 (for example, aluminum) is left with a thickness t.
The pressure can be set by the mechanical properties of only (for example, aluminum), the pressure of the safety valve can be easily set, and the formation of the safety valve is easy. In addition, since the sealing member 18 (cladding member 52) is provided with the annular groove 51 acting as a safety valve, parts of the safety valve can be omitted, and the number of parts can be reduced.

The positive electrode lead 16 and the lead 19 shown in FIG. 1 according to the embodiment of the present invention are not limited to this, and the structure for connecting the positive electrode 12 and the sealing material 18 is optional. is there. The material of the lead 19 and the positive electrode terminal 21 in FIG. 1 is arbitrary, and the material of the clad material corresponding to the lead 19 and the positive electrode terminal 21 is also arbitrary. Further, the structure and manufacturing method of the safety valve shown in FIGS. 3 and 4 are not limited thereto. For example, a hole may be formed in the clad material, and a metal (for example, aluminum) foil may be joined to the hole, or a cover may be provided in the hole against abnormal metal elastic force.

[0030]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect, the sealing material for sealing the battery case in a sealed state is formed of a clad material. Since the back side of the clad material is the same material as the lead, welding of the sealing material and the lead is easy. That is, since the positive electrode side inside the case and the positive electrode terminal outside the case are connected via the clad material, the conventional metal-to-metal contact is eliminated. As a result, the structure can be simplified and the number of parts can be reduced. Therefore, production costs can be reduced.
In addition, since the positive electrode side inside the case and the positive electrode terminal outside the case are connected via the clad material and connected by welding, there is no contact between metals as in the related art, and the electric resistance can be reduced. .

According to the second aspect, the bulging portion projecting to the front side of the clad material is formed by bending with a press, and the front plate of the bulging portion is completely removed, and at the same time, the back plate is left with a predetermined thickness t.
Since the pressure setting of the safety valve provided on the clad material is set by the thickness t of only the back plate, the pressure setting of the safety valve provided on the clad material is easy. In addition, since the front plate of the bulging portion is completely removed, and at the same time, the back plate is left with a predetermined thickness t, it is easy to form a safety valve in the clad material. Further, since the sealing member is provided with the annular groove serving as a safety valve, the explosion-proof valve is not required as in the related art, and parts of the explosion-proof valve can be omitted. As a result, the structure can be simplified and the number of parts can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a battery according to the present invention.

FIG. 2 is a perspective view of a sealing material according to the present invention.

FIG. 3 is a first explanatory view of a method for manufacturing a sealing material according to the present invention.

FIG. 4 is a second explanatory view of the manufacturing method of the sealing material according to the present invention.

FIG. 5 is an operation diagram of a battery according to the present invention.

FIG. 6 is an explanatory view of a conventional battery.

[Explanation of symbols]

11 ... case, 12 ... positive electrode, 13 ... negative electrode, 16 ... positive electrode lead, 18 ... sealing material, 19 ... lead, 51 ... annular groove, 52 ... cladding material, 53 ... front plate, 54 ... back plate, 67
... press machine, 76 ... bulging part.

Continued on the front page (72) Inventor Teruyuki Oka 1-10-1, Shinsayama, Sayama City, Saitama Prefecture Inside Honda Engineering Co., Ltd. (72) Inventor Toshiyuki Kubo 1-10-1, Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. Within the company (72) Inventor Satoshi Tabuchi 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. (72) Inventor Yasuhisa Saito 1-10-1, Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. (72) Inventor Toritsu Kuwahara 1-10-1 Shinsayama, Sayama-shi, Saitama F-term (reference) 5H011 AA04 AA09 AA13 CC06 CC10 DD03 DD07 5H012 AA01 BB02 DD01 DD05 DD06 EE04 FF01 GG01 JJ01 5H022 AA18 BB02 BB03 CC12 CC13 CC16 CC22 EE01

Claims (2)

[Claims] 1. A sealing material is mounted in a case by welding one end of a lead made of a conductive material to the back of the sealing material and pressing the other end of the lead against one end of an electrode housed in the case. The battery according to claim 1, wherein the encapsulating material is a clad material whose back side is made of the same material as the lead. 2. The sealing is performed by bending an annular groove having a V-section in the clad material by pressing from the back side to the front side, cutting off a protruding portion protruding toward the front side, and flattening the front side. 2. The battery according to claim 1, wherein the material is provided with an annular groove serving as a safety valve.