JPH09134731A - Solid electrolyte battery and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aggregate battery which is thin and high in processability and minimum in surplus space, by bonding the peripheries of the collectors of positive electrodes and negative electrodes alternately to the frame of an adhesive so as to arrange the electrode material in the holes of the adhesive frame in lattice form. SOLUTION: A solid electrolyte battery is constituted of a collector where a lattice-shaped adhesive frame 6 having a plurality of roughly rectangular holes and electrode material having dimension smaller than the hole of the adhesive frame 6 are arranged. For the electrode material, a positive electrode active substance 4, a negative electrode active substance 1 are arranged, and it consists of a high polymer solid electrode 2 so that it may cover the active substance. The positive electrode collector 5 and the negative electrode collector 3 are bonded, at their peripheries, alternately to the adhesive material frame 6, and the collector of a counter electrode projected to one side at least so that the collectors 3 and 5 may face each other is arranged, and they are electrically connected inside and outside. Hereby, an aggregate battery, which has a heat radiation mechanism and minimizes the surplus space can be manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembled battery applicable to devices, EVs, LLs and the like which require a power source capable of supplying high voltage and high current.

[0002]

2. Description of the Related Art A conventional assembled battery is divided into six compartments in a single container like a lead battery and connected in parallel in the upper space, or like a lithium battery. In addition, one battery is assembled by external connection and stored in one container, but the excess space of the assembled battery is large,
In addition, it is necessary to provide a heat dissipation mechanism because it generates heat when discharged with a high current.

[0003]

DISCLOSURE OF THE INVENTION The present invention uses a polymer solid electrolyte for an assembled battery having a thin structure, high workability, serial / parallel connection inside the battery, a minimum excess space, and a heat dissipation mechanism. The purpose is to produce.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a lattice-shaped adhesive material frame body having a plurality of substantially rectangular holes and protrudes at least on one side and is smaller than the substantially rectangular hole of the adhesive material. It is composed of a current collector in which an electrode material having an outer size is arranged, and the outer peripheral edges of the positive electrode and negative electrode current collectors are alternately arranged so that the electrode material is arranged in the substantially rectangular hole of the adhesive material. A counter electrode current collector that is bonded to the positive electrode and the negative electrode current collector and protrudes at least on one side so as to face the current collectors of the positive electrode and the negative electrode, and the positive electrode and the negative electrode current collector are electrically connected internally or externally (hereinafter Outside precursor), a positive electrode active material and a negative electrode active material are arranged as the electrode material, and a separator made of a polymer solid electrolyte or a gel electrolyte is arranged so as to cover the positive electrode active material surface and / or the negative electrode active material surface. What you did The outer dimension of the adhesive material frame body is at least 2 mm larger than the peripheral area of the bonded portion of the current collector, and the outer dimension excluding the protruding portion of the current collector of the counter electrode is at least 0.5 mm smaller than the inner dimension of the substantially rectangular hole of the adhesive material and the electrode material. That the outer dimensions are the same (hereinafter referred to as "intermediate precursor"), the counter electrodes of the intermediate precursor are overlapped with each other, and at least the protruding portion of the intermediate precursor is bonded to the adhesive material frame body (hereinafter referred to as "precursor"); A plurality of the precursors are sandwiched by the outer precursors, which are connected in series in a plane and connected in parallel in a thickness, the whole battery is sealed by an adhesive, and at least the protrusions are connected to each other to be assembled. That the projecting portion of each of the current collectors is a cooling fin, a voltage control circuit is provided at a connection portion of the current collectors, and a current collector of the same polarity is located on the outer precursor. Arrange the precursors so that The adhesive is adhered to by an adhesive, and the precursor of the same polarity is further laminated thereon and the adhesion is repeated. Finally, the outer precursor is arranged and bonded to be assembled, the outer precursor and the intermediate precursor, and In order to achieve the above-mentioned object by the number of batteries constituting the precursor being three, the shape maintaining function of the polymer solid electrolyte or gel electrolyte is effectively used, and the active material is collected by printing or the like. It is placed on the body surface, the electrolyte is placed so as to slightly protrude (for example, about 0.4 mm) on the surface, and the current collector cut to a predetermined outer size is housed in a grid-shaped adhesive frame. It can be assembled by repeating adhesion,
A part of the current collector can be made to project, and that part can have an electrical connection and a heat dissipation function. That is, the precursors can be assembled by alternately stacking and adhering the precursors on the outer precursor battery serving as the base.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Deformation of the current collector and short-circuit with an adjacent counter electrode current collector by increasing the outer dimension of the adhesive material frame by at least 2 mm or more from the peripheral region of the bonding portion of the current collector of the outer precursor,
Also, it is possible to minimize the deterioration of the battery storage performance due to the deterioration of the active material due to the moisture absorption through the adhesive and the swelling of the battery due to the generation of gas. The outer size of the intermediate precursor, excluding the protruding part of the current collector, is at least 0.
By making the size 5 mm smaller and the same as the outer size of the electrode material, the excess space can be minimized, and a minute short circuit inside can be prevented to prevent deterioration of battery performance.

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto. The thickness is exaggerated to clarify the positional relationship in the drawings.

(Invention 1) FIG. 1 is a sectional view showing an outer precursor. A copper foil having a thickness of 0.03 mm (or a stainless steel foil, a resin film surface coated with about 0.01 mm of copper) in a dry air atmosphere. A negative electrode active material 1 (for example, carbon material) is printed with a metal mask to a thickness of about 0.20 mm by taking a non-coated area of about 5.6 mm around the surface, and the solid polymer electrolyte is further covered so as to cover the surface of the negative electrode active material 1. 2. Screen-printed negative electrode current collector 3 with a thickness of 0.04 mm and aluminum foil with a thickness of 0.03 mm (or stainless steel foil, resin film with about 0.01 mm of aluminum clad or plated) on the periphery. The positive electrode current collector 5 (still solid) in which the positive electrode active material 4 (for example, lithium cobalt oxide, lithium manganese dioxide compound, lithium nickel oxide, etc.) is printed to a thickness of about 0.25 mm in the area excluding the non-coated area of 5.6 mm. Electrolyte 2 as positive electrode active material 4 May be printed on the upper surface of the active material.) Is placed on an adhesive material frame 6 having a thickness of about 0.3 mm, which is made of a modified polypropylene resin in a grid pattern and has a substantially rectangular hole having an inner size larger by about 0.6 mm than the outer size of the active material. Then, heat and pressure are applied from the surface of the current collector and heat fusion is performed. At least one side on which an active material serving as a counter electrode is arranged on the surface of these active materials has a protruding portion for electrical connection, and the other side has a positive electrode collector (positive electrode) housed in the grid of the adhesive. The current collector 5'and the negative electrode current collector 3 ') are arranged in close contact with each other, and at least a part of the current collector located at the protruding portion is bonded to the adhesive material frame 6 in the same manner as described above to form the outer precursor. It was made. The active material arrangement dimensions of the positive electrode current collector 5 ′ and the negative electrode current collector 3 ′ were the same as the outer dimensions of the current collector except for a part (protruding portion). The positive electrode current collector 5 ′ and the negative electrode current collector 3 ′ are shown separated from other members in the drawing.

(Invention 2) FIG. 2 is a cross-sectional view showing an intermediate precursor and a precursor. The positive electrode current collector 5'and the negative electrode current collector 3'shown in the present invention are opposed to each other. Then, it is adhered to the lattice-shaped adhesive material frame 6 '.

(Invention 3) FIG. 3 is a sectional view showing a solid electrolyte battery in which two outer precursors and a plurality (two in this case) of precursors are assembled. Each time the precursors are superposed so that the current collector surfaces are in contact with each other, an adhesive is bonded to the opposing current collector surfaces, and finally the outer precursors are arranged as shown in FIG. 3 and the adhesives are bonded in the same manner. The inside of the battery is sealed. FIG. 4 shows a perspective view of such an assembled solid electrolyte battery in which the projecting portions 7 of the respective current collectors are electrically connected and the voltage control circuit element circuit 8 is partially provided.
The connection is made via. It should be noted that, in the drawings, the connection state between the respective projecting portions 7 is not shown in order to clarify the positional relationship. When connected, the protrusions 7 are in close contact with each other. The actual distance between the protrusions 7 is about 0.3 mm at maximum.

[0010]

As is apparent from the above description, the present invention can be divided into an outer precursor and a precursor, and by stacking the respective current collectors into a collective battery, an arbitrary battery capacity (parallel The larger the number, the larger the capacity). Further, a protruding portion of the current collector can be provided on the outer peripheral edge of the assembled battery, and the amount of heat inside the battery when a large current is discharged can be radiated to the outside through the protruding portion, and the solid electrolyte is decomposed by heat. Is suppressed and battery performance is maintained. Further, since the inside of the battery is hermetically sealed by the adhesive material frame, deterioration of battery performance due to self-discharge due to moisture absorption is reduced. In addition, since the solid electrolyte is used, the current collector portion such as the precursor that is stored inside the battery can be made small, and the continuous current collector in which the electrode material is placed on only one side can be cut from above the electrode material to a predetermined size. It can be manufactured by and the processing steps can be simplified. Further, by making the solid electrolyte larger than the surface of the active material, the internal short circuit of the battery does not occur even if the accuracy of internal adhesion and arrangement is not improved.

Further, the voltage control circuit element circuit 8 can be made thin by making it on a printed circuit board, and the voltage control circuit element circuit 8 can be made thin by sandwiching it between the current collectors of the protrusions and making an electrical connection between the upper and lower sides, thereby keeping the whole battery thin and keeping the outer dimensions. Can be made with. Further, by making the base materials of the current collectors adjacent to each other the same, there is no need for external connection, and the current collectors can be configured as shown in the cross-sectional view of the outer precursor and the precursor of FIG. 5, for example.

As described above, the assembled solid electrolyte battery of the present invention can be made thin, and when it is adhered, it is shaped into a curved surface by adhering it in a curved state (for example, according to the body shape of an automobile). Shape) and space can be used effectively. In the present invention, the material, size, and shape of each material constituting the solid electrolyte battery are not particularly limited except for being described in the claims, and can be arbitrarily selected according to the application and the required battery capacity. It is a thing. In addition, the positive electrode current collector 5 ′ and the negative electrode current collector 3 ′, which are outer precursors, have a larger outer size than the outer size of the electrode material, and the outer peripheral edge of the current collector is adhered to an adhesive to form a basic unit of assembly. can do. It is also possible to provide the protrusion in the length direction shown in FIG. 4 in the lateral direction.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an outer precursor according to the present invention.

FIG. 2 is a cross-sectional view showing an intermediate precursor and a precursor according to the present invention.

FIG. 3 is a cross-sectional view showing an assembled solid electrolyte battery according to the present invention.

FIG. 4 is a perspective view showing an assembled solid electrolyte battery according to the present invention.

FIG. 5 is a cross-sectional view showing another outer precursor according to the present invention.

[Explanation of symbols]

 1 Negative Electrode Active Material 2 Polymer Solid Electrolyte 3 Negative Electrode Current Collector 4 Positive Electrode Active Material 5 Positive Electrode Current Collector 6 Lattice Adhesive Frame 7 Protrusion 8 Voltage Control Circuit Element

Claims (10)

[Claims] 1. A current collector in which a grid-shaped adhesive material frame body having a plurality of substantially rectangular holes and an electrode material projecting at least on one side and having an outer size smaller than the substantially rectangular hole of the adhesive material are arranged. The positive and negative electrode current collectors are alternately bonded to the frame of the adhesive material so that the electrode material is arranged in the substantially rectangular hole of the adhesive material. A solid electrolyte battery having a counter electrode current collector that is projected to at least one side so as to face with the positive electrode and a negative electrode current collector and has an outer precursor electrically connected internally or externally. 2. A positive electrode active material and a negative electrode active material are arranged as the electrode material, and a separator made of a polymer solid electrolyte or a gel electrolyte is arranged so as to cover the surface of the positive electrode active material and / or the surface of the negative electrode active material. The solid electrolyte battery according to claim 1. 3. The solid electrolyte battery according to claim 1, wherein the outer dimension of the adhesive material frame body is at least 2 mm or more larger than the peripheral area of the adhesive portion of the current collector. 4. The intermediate precursor having an outer size, which is smaller than the inner size of the substantially rectangular hole of the adhesive, by at least 0.5 mm and is the same as the outer size of the electrode material, excluding the protruding portion of the current collector of the counter electrode. Solid electrolyte battery. 5. The solid electrolyte battery according to claim 1, further comprising a precursor in which counter electrodes of the intermediate precursor are superposed on each other and at least a protruding portion of the intermediate precursor is bonded to an adhesive material frame. 6. A plurality of the precursors are sandwiched by the outer precursors, and the precursors are connected in series in a plane and parallel in a thickness, the whole battery is sealed with an adhesive, and at least the protrusions are connected to each other. The solid electrolyte battery according to claim 1, which is assembled by assembling. 7. The solid electrolyte battery according to claim 1, wherein the projecting portion of each current collector is a cooling fin. 8. The solid electrolyte battery according to claim 1, wherein a voltage control circuit is provided in a connection portion of the current collector. 9. The precursor is arranged so that a collector of the same polarity is located on the outer precursor, and the precursors are adhered to each other with an adhesive, and the precursor of the same polarity is superposed on the precursor. A method for producing a solid electrolyte battery, characterized in that the adhesion is repeated, and finally the outer precursor is arranged and adhered to be assembled. 10. The method for producing a solid electrolyte battery according to claim 9, wherein the number of batteries constituting the outer precursor, the intermediate precursor and the precursor is three.