JP3830284B2 - Manufacturing method and equipment for sealed battery safety device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and equipment for manufacturing a safety device for a sealed battery having an explosion-proof function.
[0002]
[Prior art]
In recent years, secondary batteries using non-aqueous electrolytes are widely used in portable electronic devices and the like for lithium batteries and lithium ion batteries using non-aqueous electrolytes.
While such a secondary battery has a characteristic of having a high electromotive force, an electrode body including a positive electrode and a negative electrode housed in an outer can may cause a chemical change to increase an internal pressure, which may cause a burst. For example, when a non-aqueous electrolyte battery such as a lithium secondary battery is overcharged, or when a large current flows due to a short circuit due to misuse, the non-aqueous electrolyte in the electrode body is decomposed and gas May occur. When such a gas gradually fills the outer can and the internal pressure in the outer can rises, the battery eventually ruptures.
In order to prevent such rupture of the battery, for example, there is a conventional battery that incorporates a safety device for preventing rupture in the positive electrode lid.
[0003]
[Problems to be solved by the invention]
However, conventional safety devices require efficient and continuous production because the individual parts that make up the safety device require complicated and high-precision processing and welding in order to achieve current interruption and burst pressure with little variation. It was difficult.
The present invention is intended to solve such a problem. The components of the safety device are bonded to each other in a laminated state in the state of a band or a cut plate, and the contact portion serving as a current interrupting portion is welded with high accuracy. A sealed battery safety device manufacturing method capable of mass-producing a sealed battery safety device that can be punched into a final product without being required and can realize current interruption and burst pressure with little variation. And to provide equipment.
[0004]
[Means for Solving the Problems]
According to a first aspect of the present invention for achieving the object of the present invention, there is provided a method for manufacturing a sealed battery safety device, wherein a pressure receiving plate and a shielding plate are laminated via an annular insulating plate, A method for manufacturing a safety device for a sealed battery, wherein the central portion of the shielding plate is joined by welding, and the joining is peeled off when a predetermined pressure or more is generated between the pressure receiving plate and the shielding plate. A laminated material is formed by laminating a band-shaped or cut-plate-shaped pressure receiving plate material and a shielding plate material via a band-shaped or cut-plate-shaped insulating plate material provided with bonding openings at a predetermined longitudinal pitch. The parts where the pressure-receiving plate material and the shielding plate material are aligned with the joint opening of the insulating plate material are joined sequentially by welding, and then the laminated battery is sequentially punched out in a form including the joint opening, thereby continuously providing the safety device for the sealed battery. To manufacture.
[0005]
In addition, the above-described method for manufacturing a sealed battery safety device according to the first invention is also characterized by the following points.
(1) As the pressure receiving plate material, a clad metal plate material obtained by cladding a metal foil material on a metal substrate material having predetermined holes in the longitudinal direction can be used. And the 1st communicating part which fractures | ruptures when the internal pressure of a sealed battery becomes more than predetermined pressure by the part of the metal foil material which seals a hole will be formed. Here, aluminum, iron, copper, stainless steel or the like can be used as the metal substrate material, and the thickness thereof is about 600 μm. On the other hand, nickel, aluminum, copper or the like can be used as the metal foil material, and the thickness thereof is about 30 μm.
[0006]
(2) As the shielding plate material, a clad metal plate material obtained by cladding a metal foil material on a metal substrate material provided with predetermined holes can be used. And the 2nd communication part will form the 2nd communication part which will fracture when the internal pressure of a sealed type battery becomes still higher by the part of metal foil which seals a hole. Here, nickel or the like can be used as the metal substrate material, and its thickness is about 100 μm. On the other hand, nickel, aluminum, copper, etc. can be used for the metal foil material, and the thickness can be about 30 μm.
[0007]
In the above (1) and (2), the clad metal plate material is, for example, 1 × 10 ⁻¹ to 1 × 10 ⁻⁴ Torr as disclosed in Japanese Patent Laid-Open No. 1-222484 by the present applicant. In an extremely low pressure inert gas atmosphere, a metal substrate material having a bonding surface and a metal foil material are each grounded as one electrode A, and an alternating current of 1 to 50 MHz is provided between the other electrode B which is insulated and supported. It can be manufactured by applying glow discharge and applying the sputter etching so that the area of the electrode exposed to the plasma generated by the glow discharge is 1/3 or less of the area of the electrode B. .
[0008]
(3) The insulating plate material is made of a resin such as polyethylene, and the thickness thereof can be about 500 μm.
[0009]
(4) Welding of the pressure-receiving plate material and the shielding plate material is spot welding. As welding conditions at that time, for example, the welding voltage is 200 V, the spot diameter is 2 mm, the energization time is 10 msec, and the spot pressing force is 80 N.
[0010]
The facility for manufacturing a sealed battery safety device according to the second aspect of the present invention for achieving the object of the present invention includes a pressure receiving plate and a shielding plate laminated via an annular insulating plate, and a central portion of the pressure receiving plate. Is a facility that manufactures a safety device for a sealed battery that is configured so that the central portion of the shield plate is joined by welding and the joint is peeled off when a pressure exceeding a predetermined level is generated between the pressure receiving plate and the shield plate. A belt-shaped or cut-plate-shaped pressure receiving plate material and a shielding plate material, and a strip-shaped or cut-plate-shaped insulating plate material provided with openings for joining at a predetermined longitudinal pitch, respectively, and a plate material feeding device for feeding each independently. A pressure receiving plate material, a shielding plate material, a pressure bonding laminating apparatus that forms a laminated material by applying an adhesive to the insulating plate material and laminating it in a crimped state, and the pressure receiving plate material and the shielding plate material are aligned with the opening for joining the insulating plate material in the laminated material Sequential welding A welding device for joining Te comprises a sequential stamping punching apparatus with a safety device of a laminated material in a form including the junction opening.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be specifically described with reference to an embodiment shown in the accompanying drawings.
First, the configuration of a sealed battery safety device 10 that can be manufactured by the method for manufacturing a sealed battery safety device according to an embodiment of the present invention will be briefly described with reference to FIGS. .
[0012]
As shown in FIGS. 6-8, the electrode body 12 is accommodated in the armored can 11 which also serves as a negative electrode terminal. The electrode body 12 has a configuration in which a laminate of a positive electrode 13, a separator 14, and a negative electrode 15 is spirally wound. And the positive electrode lid | cover 16 is attached to the opening part for upper-end joining of the armored can 11 via the insulating gasket 16a, and the positive electrode lid | cover 16 has the sealing device which serves as a terminal with the safety device 10 which has the structure demonstrated below. 21.
[0013]
In other words, the safety device 10 substantially includes an annular pressure layer that is formed on the upper surface of the pressure receiving plate 18 and a pressure receiving plate 18 that forms an innermost lid and is connected to the positive electrode 13 of the electrode body 12 via the positive electrode lead 17. The insulating plate 20a is laminated on the upper surface of the insulating plate 20a and includes a pressure receiving plate 18 and a shielding plate 20 having a protruding contact portion 19 that is electrically joined by welding at the center.
Here, a sealed space 22 is formed by interposing an annular insulating plate 20 a between the sealed air pressure receiving plate 18 and the shielding plate 20, and argon gas, nitrogen gas or the like is not contained in the sealed space 22. Active gas is enclosed. In the sealed space 22, the sealing plate 21 and the contact portion 19 are joined and electrically connected to the pressure receiving plate 18 by welding.
[0014]
In the pressure receiving plate 18 and the shielding plate 20, the pressure in the outer can 11 and the pressure in the sealed space 22 are the first set breaking pressure P1 (for example, 4 to 5 kg / cm ² ) and the second set breaking pressure P2, respectively. First and second communication portions 23 and 24 are formed which break when they are equal to or greater than (for example, 20 kg / cm ² ).
The pressure receiving plate 18 is formed by bonding a thin (for example, 30 μm) metal foil 27 made of aluminum foil to a lower surface of a thick (for example, 600 μm) metal substrate 26 made of aluminum having communication holes 25 using a clad technique or the like. The first communication portion 23 is formed by a communication hole 25 and a portion of the metal foil 27 that seals the communication hole 25.
[0015]
The shielding plate 20 also has a thin (for example, 30 μm) metal foil 30 made of aluminum foil adhered to the lower surface of a thick (for example, 100 μm) metal substrate 29 made of nickel having the communication holes 28 using a cladding technique or the like. The second communication portion 24 is formed by a communication hole 28 and a portion of the metal foil 30 that seals the communication hole 28.
Next, a manufacturing facility A for manufacturing the above-described sealed battery safety device will be described with reference to FIGS.
As shown in the drawing, on the uppermost stream side of the floor surface 31, a first plate material feeding device 33 made of an uncoiler for feeding a strip-shaped insulating plate material 32 is disposed, and downstream of the first plate material feeding device 33. On the side, a hollow press 35 is provided for providing the openings 34 for bonding at a predetermined pitch in the insulating plate 32.
[0016]
A stand 36 is installed on the downstream side of the hollow press 35, and an insulating plate material roller conveyor 38 for guiding the transfer of the insulating plate material 32 to the downstream side is provided in the upper frame 37 of the stand 36. On the other hand, on the floor surface 31 that forms the lower part of the roller conveyor 38 for the insulating plate material, a second plate material feeding device 40 comprising an uncoiler for feeding the belt-shaped pressure receiving plate material 39 is disposed. Here, the pressure receiving plate material 39 is preferably a clad metal plate material in which a metal foil material 43 is clad on the lower surface of a metal substrate material 42 provided with predetermined holes 41 in the longitudinal direction. On the other hand, on the upper frame 37 of the gantry 36, a third plate material feeding device 45 made of an uncoiler for feeding the strip-shaped shielding plate material 44 is placed. Here, the shielding plate member 44 is preferably a clad metal plate member in which a metal foil member 47a is clad on the lower surface of a metal substrate member 47 provided with a predetermined hole 46 in the longitudinal direction.
[0017]
A pressure laminating device 48 having a pair of pressure rollers 48 a and 48 b is disposed on the downstream side of the gantry 36. The pressure bonding laminating device 48 applies an adhesive to the insulating plate 32, the pressure receiving plate 39, and the shielding plate 44 fed from the first to third plate feeding devices 33, 40, and 45, respectively. The layered material 49 can be formed by laminating layers, lower layers, and upper layers in a pressure-bonded state.
A welding device 50 including a spot welder is disposed on the downstream side of the pressure laminating device 48. With this welding apparatus 50, the portions of the laminated material 49 that are aligned with the joint openings 34 of the pressure-receiving plate material 39 and the shielding plate material 44 can be joined accurately and easily by sequential spot welding.
[0018]
On the downstream side of the welding device 50, a punching device 51 including a punching press is disposed. With this punching device 51, a plurality of safety devices 10 having the above-described laminated structure can be sequentially punched from the laminated material 49 in a form including the bonding opening 34 by a single punching operation.
On the downstream side of the punching device 51, a winding device 52 made of a recoiler for winding the laminated material 49 after punching the safety device 10 is disposed.
[0019]
The other configuration of the sealed battery safety device manufacturing facility A in the illustrated embodiment will be described. As shown in FIG. 3, a feeder device 53 may be provided between the crimping laminating device 48 and the welding device 50. it can. By engaging the engaging claws 54 of the feeder device 53 with the pilot holes 55 formed on both sides of the laminated material 49, the laminated material 49 can be transferred to the welding device 50 and the punching device 51 more reliably and accurately. Can do.
[0020]
Next, a manufacturing method of a sealed battery safety device using the manufacturing facility A for manufacturing the above-described sealed battery safety device will be described with reference to FIGS.
First, as shown in FIGS. 1 to 3, the first to third plate material feeding devices 33, 40, and 45 are driven in synchronization to feed the insulating plate material 32, the pressure receiving plate material 39, and the shielding plate material 44, and the tip thereof The parts are fed into a pressure laminating device 48 while being synchronized with each other, respectively, and an adhesive is applied thereto, and a pressure-bonding and laminating are integrally performed to form a strongly integrated laminated material 49.
[0021]
Next, as shown in FIG. 1 to FIG. 3, the laminated material 49 is fed into the welding device 50, and the portions that are aligned with the joint openings 34 of the pressure receiving plate material 39 and the shielding plate material 44 are sequentially and easily joined by spot welding. .
After the welding is completed, as shown in FIGS. 1 to 3, the laminated material 49 can be fed into the punching device 51, and the safety devices 10 can be sequentially punched from the laminated material 49 one by one by one punching operation. 4 and 5 show the safety device 10 immediately after punching.
Thereafter, as shown in FIGS. 1 and 2, the laminated material 49 after being punched is wound up by a winding device 52.
[0022]
As described above, in the present embodiment, the insulating plate 20a, the pressure receiving plate 18, and the insulating plate material 32 to be the shielding plate 20, the pressure receiving plate material 39, and the shielding plate material 44, which are components of the safety device 10, are in the state of a strip or a cut plate. Thus, since the contact portion serving as the current interrupting portion can be welded in a state of being bonded in a laminated state, high-precision welding is not required, and after the welding, a large number of the safety devices 10 that are the final product can be manufactured. Therefore, the sealed battery safety device 10 capable of realizing current interruption and burst pressure with little variation can be mass-produced at low cost.
[0023]
【The invention's effect】
As described above, in the method for manufacturing a safety device for a sealed battery according to claim 1, the insulating plate, the pressure receiving plate, the insulating plate material serving as the shielding plate, the pressure receiving plate material, and the shielding plate material, which are components of the safety device, are provided. Since the contact part that becomes the current interrupting part can be welded in the state of being bonded in a laminated state in the form of a strip or a cut plate, etc., high-precision welding is not required, and after welding, the safety is the final product by punching multiple pieces simultaneously The device can be manufactured. Therefore, it is possible to inexpensively mass-produce a sealed battery safety device that can realize current interruption and burst pressure with little variation.
[0024]
In the method of manufacturing a sealed battery safety device according to claim 2, the pressure-receiving plate material can be easily manufactured by cladding the metal foil material on the metal substrate material provided with the predetermined holes.
In the method for manufacturing a safety device for a sealed battery according to claim 3, the shielding plate material can be easily manufactured by cladding the metal foil material on the metal substrate material provided with the predetermined holes.
[0025]
In the facility for manufacturing a safety device for a sealed battery according to claim 4, a band-shaped or cut-plate-shaped pressure-receiving plate material and a shielding plate material, and a band-shaped or cut-plate-shaped insulating plate material provided with bonding openings at a predetermined longitudinal pitch. In the laminating material, the laminating device for feeding the plate material independently, the pressure receiving plate material, the shielding plate material, the pressure bonding laminating device for applying the adhesive and laminating the insulating plate material to form a laminated material There are few variations because it consists of a welding device that sequentially welds the locations located in the joint opening of the pressure receiving plate material and the shielding plate material and a punching device that sequentially punches the safety device from the laminated material in a form including the joint opening. In addition to being able to mass-produce safety devices for sealed batteries that can achieve current interruption and burst pressure, the production equipment itself can be manufactured at low cost. That.
[Brief description of the drawings]
1 is an overall side view of a manufacturing facility for a safety device for a sealed battery according to an embodiment of the present invention;
FIG. 2 is a perspective view showing the flow of an insulating plate material, a pressure receiving plate material, and a shielding plate material in a method for manufacturing a sealed battery safety device according to an embodiment of the present invention.
FIG. 3 is a side view showing the flow of an insulating plate material, a pressure receiving plate material, and a shielding plate material in the method for manufacturing a sealed battery safety device according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view of a sealed battery safety device immediately after being manufactured by the sealed battery safety device manufacturing method according to an embodiment of the present invention.
FIG. 5 is a perspective view with the same part cut away.
FIG. 6 is an explanatory diagram of the use state of the sealed battery safety device manufactured by the method for manufacturing the sealed battery safety device according to the embodiment of the present invention in a normal use state.
FIG. 7 is an explanatory diagram of a usage state in a state where the first communication part of the safety device for a sealed battery manufactured by the method for manufacturing a safety device for a sealed battery according to an embodiment of the present invention is broken.
FIG. 8 is an explanatory diagram of a usage state in a state in which a second continuous portion of the safety device for a sealed battery manufactured by the method for manufacturing a safety device for a sealed battery according to an embodiment of the present invention is broken. .
[Explanation of symbols]
A Sealed Battery Safety Device Manufacturing Equipment 10 Sealed Battery Safety Device 11 Exterior Can 18 Pressure Plate 20 Shield Plate 20a Insulating Plate 21 Sealing Plate 23 First Communication Portion 24 Second Communication Portion 32 Insulating Plate Material 33 First Plate material feeding device 39 pressure receiving plate material 40 second plate material feeding device 41 hole 42 metal substrate material 43 metal foil material 44 shielding plate material 45 third plate material feeding device 46 hole 47 metal substrate material 47a metal foil material 48 pressure laminating device 49 lamination Material 50 Welding device 51 Punching device

Claims (4)

The pressure receiving plate and the shielding plate are laminated via an annular insulating plate, the central portion of the pressure receiving plate and the central portion of the shielding plate are joined by welding, and a pressure greater than a predetermined pressure is provided between the pressure receiving plate and the shielding plate. Is a method of manufacturing a sealed battery safety device configured such that the bond is peeled off when
A band-shaped or cut-plate-shaped pressure-receiving plate material and a shielding plate material are laminated via a band-shaped or cut-plate-shaped insulating plate material provided with bonding openings at a predetermined longitudinal pitch, and a laminated material is formed. The sealed battery safety device is formed by sequentially welding locations where the plate material and the shielding plate material are aligned with the joint opening of the insulating plate material, and then sequentially punching out the laminated material in a form including the joint opening. Is manufactured continuously. A method of manufacturing a sealed battery safety device. The sealed battery safety device according to claim 1, wherein the pressure-receiving plate material is a clad metal plate material obtained by cladding a metal foil material on a metal substrate material provided with predetermined holes at intervals in the longitudinal direction. Production method. 3. The sealed battery according to claim 1, wherein a clad metal plate obtained by cladding a metal foil material on a metal substrate material provided with predetermined holes at intervals in the longitudinal direction is used as the shielding plate material. Device manufacturing method. The pressure receiving plate and the shielding plate are laminated via an annular insulating plate, the central portion of the pressure receiving plate and the central portion of the shielding plate are joined by welding, and a pressure greater than a predetermined pressure is provided between the pressure receiving plate and the shielding plate. Is a facility for manufacturing a safety device for a sealed battery configured to peel off the joint when
A plate material feeding device for independently feeding a belt-shaped or cut-plate-shaped pressure-receiving plate material and a shielding plate material, and a strip-shaped or cut-plate-shaped insulating plate material provided with openings for joining at a predetermined longitudinal pitch;
A pressure laminating device that forms the laminated material by applying the adhesive and laminating the insulating plate material in a pressure-bonded state; and
A welding device that sequentially welds the pressure-receiving plate material and the shielding plate material in the laminated material at positions where the insulating plate material is aligned with the joint opening;
A facility for manufacturing a safety device for a sealed battery, comprising: a punching device that sequentially punches the safety device from the laminated material in a form including the bonding opening.

Images