JPH1131486A - Flat battery - Google Patents

Abstract

(57) [Problem] To provide a flat battery having a large energy density, which is easy to manufacture, has high sealing properties, has high mechanical strength of terminals, and is easily connected to a peripheral electric circuit. SOLUTION: An electrochemical reaction element, exterior members 4 and 5 accommodating the electrochemical reaction element, and electric energy or electrical information generated from the electrochemical reaction element are output to the exterior of the exterior members 4 and 5. In the flat battery having an electric terminal, at least a part of the exterior members 4 and 5 is formed into sealing portions 16 and 17 having a film structure, and the exterior members are formed in the sealing portions 17 in a direction perpendicular to the sealing surface. A flat-type battery provided with an electric terminal 15 which is exposed to the outside in a planar manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a flat type battery, particularly a flat type non-aqueous
Next battery.

[0002]

2. Description of the Related Art In a conventional flat battery, a terminal portion for extracting current from a positive electrode and a negative electrode to the outside of an exterior material is generally used because the exterior material itself is flat and a sealing portion is planar. Instead of a terminal like a typical single-type dry battery, an electrode current collector is directly exposed in the surface direction of a flat exterior material to form a terminal (Japanese Patent Laid-Open No. 57-174860, hereinafter also referred to as Conventional Example 1). There is a flat battery in which an end of a sealing portion of an exterior material and a lead terminal portion of a metal current collector of an electrode are sealed together and a terminal is taken out in a sealing direction (JP-A-62-61268).
Gazette, hereinafter also referred to as Conventional Example 2. )

FIG. 14 is a schematic sectional view showing the configuration of a flat battery of Conventional Example 1. 1 is a positive electrode, 2 is a negative electrode, 3 is an electrolyte, 4 is a positive-side laminate film, 5 is a negative-side laminate film,
A packaging material is formed from 5 and 4, 6 is a sealing portion, 8 is a positive terminal, and 7 is a negative terminal. The electrodes 1 and 2 are
Although not shown, an active material layer is formed on each current collector made of metal, the active material layer faces the electrolytic solution, and the current collector made of metal faces the exterior material. . Although not shown in FIG. 3, an electrolytic solution is permeated into the separator. The laminated films 4 and 5 have a multilayer structure, and at least one side of the metal film is coated with a sealing material or an adhesive for sealing. Since this flat battery is a battery, it is not used alone, but is used in a configuration with other parts in which an electric circuit for controlling and using current and voltage is electrically connected to terminals. In particular, a non-aqueous secondary battery such as a lithium ion battery is generally provided with an electric circuit for controlling an applied voltage and a current while detecting a voltage as well as taking out the current from the battery. In addition, during charging and discharging, a current is passed while controlling the voltage and the current to use the battery. For this reason, inconveniences that do not occur by itself may occur.

In this flat battery, a conductive member is brought into direct contact with terminals 7 and 8 and fixed by a member for applying pressure, a fusing material, an adhesive, or the like, for electrical connection, or An intermediate terminal is separately provided, which is brought into contact with and fixed in the same manner as described above, so that electrical connection is made and current is taken out to the outside. In this method, the terminal is directly taken out from the exterior material in the surface direction, so that an electric circuit for controlling and using a current, a voltage, and the like generated from the battery in the direction of lamination on the terminal portion is provided, or this electric circuit is provided. It is necessary to provide an extension line in order to provide an extension around the non-stacked direction separately from the battery. In the former case, the thickness of the flat battery is reduced, so that the thickness including the electric circuit is increased, and the advantage of the flat battery is lost. In the latter case, the thickness of the connecting member, such as the extension line, increases, and an uneven shape occurs on the plane of the exterior material. In addition, the connection member needs to be subjected to electrical insulation treatment or treatment for increasing mechanical strength, and the thickness may be further increased. In both cases, the terminals are taken out in the direction perpendicular to the electrodes, so they are applied to the electric circuits and terminals in the process of connection between the terminals and the electric circuit, or in the event of impact during use after connection. Since the force is applied directly to the electrode portion vertically, the electrode, the electrolyte, and the interface thereof are easily damaged. This damage tends to increase as the flat battery becomes thinner because the mechanical strength becomes lower. For example, the active material is partially peeled off from the current collector, or a gap is formed at the interface between the solid electrolyte and the electrode, thereby reducing the reliability of the flat battery.

FIG. 15 is a schematic sectional view showing the structure of a flat type battery according to Conventional Example 2. As shown in FIG. 1 is a positive electrode, 2 is a negative electrode, 3 is an electrolyte, 4 is a positive-side laminate film, 5 is a negative-side laminate film,
A packaging material is formed from 5 and 4, 9 is a positive electrode-side sealing portion, 10 is a negative electrode-side sealing portion, and 11 is a terminal for leading a metal current collector portion of the negative electrode to the outside of the packaging material. Part. Although the electrodes 1 and 2 are not shown,
An active material layer is formed on a current collector made of metal, the active material layer faces the electrolytic solution, and the current collector made of metal faces the exterior material. Although not shown in FIG. 3, an electrolytic solution is permeated into the separator. The laminated films 4 and 5 have a multilayer structure, and at least one side of the metal film is coated with a sealing material or an adhesive for sealing. In this flat type battery, an electric circuit for controlling and using a current, a voltage, and the like generated from the battery can be provided beside the battery in the terminal portion 11, so that the battery can be used without increasing the thickness of the flat type battery. can do. Also,
It is easy to manufacture because only the end face is sealed. But,
Since the terminal protrudes from the sealing portion, the terminal portion 1
The terminal is easy to be cut at the root of 1, and the terminal may be cut by the impact when connecting the terminal to the electric circuit or during use,
Reliability decreases. Since the current collector is generally as thin as 20 μm, it is 100 μm thicker than the current collector that is not used as a current collector.
A battery to be taken out of the sealing portion was manufactured using the m-thick terminal, but the terminal portion was cut off. In addition, as the terminal is thicker, a step is formed between the terminal and the laminate film of the exterior material, so that moisture and the like easily penetrate from this portion, thereby lowering the sealing performance and reducing the reliability of the battery.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an easy-to-manufacture, high-sealing property, and high mechanical strength terminal.
Another object of the present invention is to provide a flat battery having a high energy density, which is easily connected to a peripheral electric circuit.

[0007]

SUMMARY OF THE INVENTION The present invention provides an electrochemical reaction element, an exterior member for accommodating the electrochemical reaction element, and electric energy or electrical information generated from the electrochemical reaction element. In a flat battery having an electrical terminal for outputting to the outside, at least a part of the exterior member is a sealing portion having a film structure, and a flat surface is formed inside the sealing portion outside the exterior member in a direction perpendicular to a sealing surface. A flat-type battery provided with an exposed electrical terminal.
The electrical information includes, for example, information from another terminal that monitors only the electric potential, information that inserts a small IC or the like between the outer packaging materials, and information that exchanges the use time of the battery with the outside using a common terminal. Conceivable. The flat battery of the present invention having the above-described configuration is easy to manufacture, has high sealing properties, has high mechanical strength of terminals, is easily connected to peripheral electric circuits, has high energy density, and This is a flat battery with a small thickness.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the flat battery according to the present invention will be described below with reference to the drawings. 1. First Embodiment of Flat Battery of the Present Invention FIG. 1 is a schematic perspective view of one example of a flat battery of the present invention.
FIG. 2 is a sectional view taken along line AA 'of FIG. 1 and 2, 1 is a positive electrode, 2 is a negative electrode, 3 is an electrolyte, 4 is a positive-side laminate film, 5 is a negative-side laminate film, and 4 and 5
The outer packaging material is further formed, and 12 and 13 are fusion material layers,
Reference numerals 4a, 14b, and 14c denote terminal take-out portions.
Is a positive terminal take-out part, 14b and 14c are negative terminal take-out parts, 15 is a negative terminal, 16, 1 and
Reference numerals 7 and 18 denote sealing portions, reference numeral 17 denotes a terminal-side sealing portion, and reference numeral 16 denotes a sealing portion on the side opposite to the terminal take-out portion.
Numeral 8 denotes sealing portions on both sides of the terminal take-out portion. Although not shown, the electrodes 1 and 2 each have an active material layer formed on a current collector made of metal, and the active material layer side has an electrolyte 3.
, And a current collector made of metal faces the exterior materials 4 and 5. Although not shown, the electrolyte of the electrolyte 3 is permeated and supported by the separator. The exterior materials 4 and 5 have a multilayer structure, and are covered on one side of a metal film with fusion material layers 12 and 13 for sealing. Although not shown, the exterior material on the opposite side to the fusion material is not shown. The surface exposed to is covered with a thermosetting resin.

The manufactured positive electrode 1 and negative electrode 2 are punched into a predetermined size, and then the active material layer is not applied to a part of the positive electrode 1 and the negative electrode 2. The terminal 1 is made of Al, and the negative electrode 2 is made of a 50 μm thick terminal 15 made of Ni by ultrasonic welding (only the negative electrode is shown in the figure), arranged in the direction extending to the same side, and laminated with a separator interposed therebetween. This laminate is sandwiched between two laminate films 4 and 5 serving as exterior materials,
The portion 18 is heated at 120 ° C., sandwiched between metal plates, heat-sealed and sealed to form a sealed portion. After the electrolyte 3 is injected, the portion 17 corresponding to the last side is heated. The sealing portion 17 is formed by sealing by fusion. At this time, two elliptical holes are formed in the laminated film of the sealing portion 17, and the terminals 15 are exposed through the holes, so that the upper surface thereof becomes a terminal extracting surface, and the negative electrode terminal extracting portion 14 b,
14c is formed, and the positive electrode terminal take-out portion 14a is also formed in a similar manner, though not shown in a sectional view. However,
The following description is mainly based on the negative electrode terminal take-out part 14c.

The positive electrode 1 is prepared by dispersing LiCoO ₂ , graphite and PVDF (polyvinylidene fluoride) in a weight ratio of 90: 7: 3 in an NMP (N-methyl-2-pyrrolidone) solution, and dispersing this in a 20 μm Al substrate. To 120
Positive electrode 1 having an active material layer of about 100 μm
Was prepared. The negative electrode was made of graphite and PVDF 90:
Dispersed in NMP solution at a weight ratio of 10 and
m Cu substrate, dried at 120 degrees
The negative electrode 2 having the active material layer was prepared. Positive electrode 1,
The negative electrode 2 was also used after being roll-pressed. As the electrolytic solution 3, a 1 M-LiPF ₆ solution of a mixed solvent of PC (propylene carbonate) and DMC (dimethyl carbonate) was used. The separator has a porosity of 40% or more and a thickness of 2%.
The thing of 5 μm was used. The positive electrode active material includes LiCo
Non-aqueous secondary battery cathode materials such as oxides with lithium intercalation such as V ₂ O ₅ , LiNiO ₂ , and LiMn ₂ O ₄ other than O ₂ and polymer materials such as polyaniline and polypyrrole; conventional dry batteries; The same applies to the use of water-based primary and secondary battery materials such as alkaline batteries and nickel-metal hydride batteries. The graphite mixed with the positive electrode active material may be natural graphite, artificial graphite, or amorphous carbon. In addition, besides PVDF,
It may be a fluorine-containing NMP-soluble polymer, PVP (polyvinylpyrrolidone), or the like. In addition to natural graphite, the negative electrode active material may be artificial graphite.
Amorphous carbon may be used. PVDF is used as a binder.
Besides, soluble polymers of fluorine-containing NMP, PV
P (polyvinylpyrrolidone) or the like may be used.

The electrolyte constituting the electrolyte 3 may be a carbonate or cyclic carbonate which is a carbonate ester, or a non-aqueous electrolyte such as a carboxylate ester, acetonitrile, dimethylformamide, dimethyl sulfoxide, etc. If it is not a non-aqueous secondary battery, it may be water. The supporting salts include LiBF ₄ , LiClO ₄ ,
LiAsF ₆ , LiSO ₃ CF ₃ , LiC (SO ₂ C
F ₃ ) ₃ or LiN (SO ₂ CF ₃ ) ₂ may be used. Further, a polymer such as polyacrylonitrile, polyethylene oxide, or polyvinyl copolymer containing the above-mentioned electrolyte may be used. The separator may not be used when a polymer is used.

The laminated films 4 and 5 have a thickness of 25 μm.
Electrodes 1 and 2 are coated with polyethylene, which is a fusion material, on the side of the electrodes 1 and 2 and polyester is coated on the outside of the m-thick aluminum. In addition to polyethylene, the fusion material may be a polyolefin such as polypropylene, a modified polyolefin containing a carboxyl group, or an ionomer.Also, a hot melt resin may be used as an adhesive layer. You may only make it. The outer coating may be polyimide, polyamide, polyphenylene oxide or the like, or may be the same polyolefin-based fusing material as the inner coating. Further, at least one of them is not a laminate film but a hard case, and the case may be sealed with a fusing material or an adhesive. In addition, the film structure of the sealing portion may not be apparently film-like as long as the electrode of the outer packaging material is sufficiently thin compared to the thickness of the electrode and fusion or adhesion is used.

In the flat battery according to the present embodiment, the terminal 15 is provided in the sealing portion 17 formed by the exterior members 4 and 5, and the terminal 15 is flat in a direction perpendicular to the sealing surface. Since it is partially exposed, the step of fusing for the terminal 15 is unnecessary and can be performed simultaneously with the fusing of the exterior materials 4 and 5,
The manufacturing process can be shortened, and the end itself can be easily fused. The position of the terminal 15 is strong because the terminal is wrapped in the sealing portion 17 in which the exterior material is doubled, so that the terminal 15 is not cut off and the battery 15 is connected to the electric circuit connected to the battery. The positive and negative electrodes are not damaged and are resistant to impact during use. The connection with the electric circuit can also strongly sandwich the terminal portion, so that the reliability as electrical conduction is improved. In addition, since the terminal 15 is fused on the surface of the terminal and the pressure can be strongly applied because there is no electrode, the terminal 15 is taken out from the sealing portion to the side, and compared with the case where the terminal is taken out from the upper surface of the electrode. The sealing performance by fusion is improved.

The shape of the terminal take-out portions 14a and 14b is not limited to an ellipse, but may be a circle or a square. In the case of a quadrangle, it is preferable that the four corners be rounded holes because damage from corners is reduced. Sealing portions 16, 17,
In addition to the smooth planar sealing, the sealing 18 may be a sealing with parallel linear irregularities or a sealing with point-like projecting irregularities. These can be easily changed arbitrarily by the surface shape of the heated plate that presses the laminate portion during the heat fusion. It is desirable that the end of the terminal 15 has a length that does not protrude from the side of the sealing portion of the laminate films 4 and 5, in order to reduce poor airtightness of the exterior material from the side. is there. As a method of electrically connecting the terminal extraction portion and the electric circuit, a member using a leaf spring, a coil spring, or the like can easily connect to the electric circuit by applying a force to the terminal. This is because, unlike the conventional example 1, for example, the terminal take-out portion is located around the sealing portion and the battery, so that the terminal can be easily sandwiched and a force can be applied. Although the present embodiment is a stacked paper battery using one positive electrode and one negative electrode for explanation, a stacked multi-layer battery provided with several or more positive electrodes and negative electrodes may be used. in this case,
A terminal, a positive electrode, and a negative electrode are used by being electrically connected in advance by ultrasonic waves, spot welding, or the like.

Table 1 below shows the flat battery of this embodiment and FIG.
15 shows the results of comparative tests of the flat batteries of Conventional Example 1 shown in FIG. 15 and Conventional Example 2 shown in FIG. Table 1 below shows the results of three tests for evaluating the degree of failure associated with terminals.

[0016]

[Table 1]

In the terminal break test, a part of a 100-gram weight is welded to the terminal, and then a constant vibration is applied to check whether the terminal is broken or the terminal is broken. The terminal pressure test applies a force of 1 kilogram weight vertically to the terminal,
This is to check whether there is a change in the battery characteristics. In the sealing test, after the terminal disconnection test, a lithium piece in which the airtightness of the exterior material is inserted is evaluated. Two tests each
Perform 0 tests and indicate the number of defects. The degree of thinness was evaluated as “x” when the thickness of the electric circuit was smaller than that of the battery, and “〇” when the thickness did not change. , A, B, and C in that order. As shown in Table 1 above, it can be seen that in this embodiment, no defective product is produced, and the thickness can be the same as that of the battery even when an electric circuit is connected.

2. Second Embodiment of Flat Battery of the Present Invention FIG. 3 is a schematic cross-sectional view of another embodiment of the flat battery of the present invention, and is a cross-sectional view of a portion corresponding to line AA ′ in FIG. is there. In this embodiment, electrodes are manufactured and laminated in the same manner as in the first embodiment, three sides other than the terminal direction of the laminated body are sealed, and 17 parts corresponding to the last one side are provided. Is sealed by heat fusion to form a sealing portion 17. At this time, a total of 4
An elliptical hole is made at each location, and the terminal 1
When terminal 5 is exposed, terminal extraction portions 19a and 19b are formed on the upper and lower surfaces thereof. In this embodiment, the terminal take-out portions 19a and 19
Although the size of b is shown in the same manner, this may be a small one or an auxiliary terminal extraction portion. In this case, the small auxiliary terminal take-out portion has a role of supporting the main terminal take-out portion from the back surface by applying a force from the back surface so as to reliably apply the force to the main terminal take-out portion. Alternatively, all the current may be taken out from the opposite main terminal take-out portion without contacting the auxiliary auxiliary terminal take-out portion with a conductive member. In such a case, the surface of the terminal may be slightly deformed at the time of connection. Also, the auxiliary terminal extraction part
It may be used only for voltage detection. In the flat battery according to the present embodiment, the terminal is provided in the sealing portion, and since the terminal is exposed at the same position on the upper and lower surfaces in a plane perpendicular to the sealing surface, the battery and the When connecting to the electric circuit to be connected, the terminal is sandwiched between the members connecting to the electric circuit from both sides, and the electric connection can be made from both sides, so the electrical connection with low impedance, hard to come off and highly reliable It can be performed.

3. Third Embodiment of Flat Battery of the Present Invention FIG. 4 is a schematic view of another embodiment of the flat battery of the present invention, and FIG. 5 is a schematic cross-sectional view taken along line AA ′ of FIG. is there. 4 and 5, 17 and 18 are sealing portions, 17 is a sealing portion on the terminal side, 18 is a sealing portion on both sides of the terminal take-out portion, and 20 is an electric circuit for battery control. , 21a, 21b are external output terminals from the battery control electric circuit to an electric device utilizing the energy of the battery, respectively, 21a is a positive electrode external output terminal,
21b is a negative electrode external output terminal. Reference numeral 23 denotes a connection member for electrically connecting the battery control electric circuit 20 and the negative electrode terminal take-out portion 14c. The connection members 23 are in contact with each other under pressure at a position 24 near the center of the terminal take-out portion.

The battery according to the present embodiment uses L as a positive electrode active material.
It is a lithium ion non-aqueous secondary battery using iCoO _2, and it is desirable to input and output current to and from an electric device or a charging device while monitoring a current value or a voltage value during charging and discharging. It is desirable that charging be controlled by constant-current and constant-voltage charging. In addition, overcharging and overdischarging may not only deteriorate battery performance but also cause an explosion. Differences in voltage tend to affect battery performance. For these reasons, most lithium-ion non-aqueous batteries have a charge / discharge battery control circuit integrated and provided in the form of a battery pack.
The electric circuit 20 of the battery according to the present embodiment is an electric circuit for battery control, which is provided integrally with the flat battery wrapped in the exterior material, and the electric circuit 20 and the flat battery are integrated. This is to reduce the size of the battery pack. The electric circuit 20 has electronic components mounted on a multilayer substrate to form a charge / discharge control element. The electric circuit 20 and the external output terminals 21a and 21b are electrically connected on the substrate. 21b is made of a metal plate having a sufficient strength, for example, a metal plate having a thickness of about 0.5 mm, and this is strongly caulked by a part of electric equipment using the battery, so that the energy of the battery can be transferred from the battery to the electric circuit, Communicate with electrical equipment. At this time, the caulking force does not damage the battery body.

The flat type battery according to the present embodiment is a multi-layer type.
0 mm, length 40 mm, thickness 3 mm, the width of the sealing portion of the sealing portion 17 in the terminal direction is 6 mm, the width of the other sealing portion is 3 mm, and the size of the electric circuit 20 connected thereto. Having a width of 4 mm, a length of 25 mm, and a thickness of 2 mm. In the battery, since the electric circuit 20 is provided in the direction in which the electric circuit 20 is stacked on the upper surface of the sealing portion 17, the electric circuit 20 is smaller than the sealing portion 17. Sealing part 1
7, and the thickness can be the same as or thinner than the thickness of the battery, so that an electric circuit can be provided without increasing the length and thickness in the sealing direction of a flat battery that is manufactured small. A small flat battery in which an electric circuit is integrated can be provided. Further, since the electric circuit 20 is provided at a place where the electric circuit 20 does not come into contact with the electrode of the battery, the unevenness of the electric circuit does not damage the electrode due to an external impact or the like. Since the electric circuit 20 is laminated on the relatively strong sealing portion, the exterior of the battery is not damaged by an external impact or the like. In addition to this embodiment, the connection member 23
Is made of a metal plate, this thin direction is arranged in the direction of lamination with the sealing part, and even if a part of the electric circuit body is arranged in the direction to be horizontal with the battery, the thickness of the battery does not increase. Not
A small flat battery in which an electric circuit is integrated can be provided.

FIG. 6 is a part of a schematic sectional view of an example of the negative electrode terminal portion. In FIG. 6, 27 and 28 are electric circuits 2
0 and a connecting member made of a conductive material penetrating in a vertical direction and a sealing portion for electrically connecting the negative electrode terminal take-out portion 14c to each other. It is fixed from above and below. The connection member concave portion 27 is made of metal because an electrical connection function is required.
Since only the caulking function is effective, an insulating material such as plastic may be used. When the connecting member convex portion 28 is made of metal, the processing accuracy is required and the cost increases, but the impedance of the contact portion can be lowered because of the contact portion between 28 and 14c and the conductivity of itself.
More effective. Since the shape of the connection member is intended to fix the connection member while maintaining electrical continuity, the unevenness may be reversed, or the shape of the jaw, wedge, wave, etc. other than the unevenness may be used, or the shape may be planar. However, other shapes may be used as long as the penetrating member can be fixed. By providing at least a part of the function of fixing a part of the connection member of the electric circuit to the penetrating member itself, and by penetrating the negative electrode terminal take-out part 14c, the terminal of the battery and the electric circuit can be easily connected. Electrical connection can be made mechanically strong and highly reliable. In addition, the force for vertically sandwiching the terminals of the battery is provided in the sealing portion, and a member extending over a portion other than the sealing portion is not used, so that the size can be reduced.

FIG. 7 is a partial sectional view of the negative electrode terminal portion.
In FIG. 7, the intermediate plate 29 includes one of connection members 27, 28 made of a conductive material that vertically penetrates a sealing portion that electrically connects the electric circuit 20 and the negative electrode terminal take-out portion 14c. It is provided between the terminal portion 14c. As the intermediate plate 29, a copper plate having a hole having a thickness of 0.3 mm is used. Since the conductive connecting members 27 and 28 contact the negative electrode terminal take-out part 14c and the intermediate plate 29 by applying force,
The 14c and 29 are electrically connected, and the energy from the battery is transferred to the intermediate plate 29, the connecting member 27, and the electric circuit 2.
0 can be transmitted in order. At this time, since the intermediate plate 29 is used, the relatively thin negative electrode terminal take-out portion 14c
When using the conductive connecting member 2
It becomes difficult to be deformed when it is fixed and sandwiched by the members 7 and 28, so that the impedance of the electrical connection between the connecting member 27 and the negative electrode terminal take-out part 14 c can be reduced, and the occurrence rate of defects can be reduced. . This is the intermediate plate 29
Otherwise, the mechanical strength is greater than that of the terminal take-out portion 14c. Therefore, when sandwiched between the connection members 27 and 28, the electric terminal is deformed by the force while deforming the sealing portion of the exterior material. May occur. This is because when mechanical stress is applied to the terminal at the time of punching or welding of the terminal in the previous process and small deformation is already applied to the terminal, and when a force is applied to the terminal by the connection members 27 and 28, It was found that this occurred when the contact area was poor. However, the intermediate plate 2 having more mechanical strength than electrical terminals
By providing the connection member 9, it is possible to perform crimping while correcting the deformation of the terminal when a force is applied, and
And 28, the occurrence of defects when sandwiched was reduced. The thickness of this intermediate plate is the typical maximum thickness of the terminal, 0.
It is effective if it is 1 mm or more, and preferably 0.15 mm or more.
mm or more is preferable.

FIG. 8 is a schematic view of another embodiment of the flat battery of the present invention, and FIG. 9 is a sectional view taken along line AA 'of FIG. 8 and 9, reference numerals 30a and 30b denote positioning pins, reference numeral 31 denotes a positioning through hole for a sealing portion, and reference numeral 32 denotes a positioning pin holder. 8 and 9, the connection member 23 (see FIG. 5) of the electric circuit 20 and the terminal take-out portions 14a, 14b of the sealing portion 17 are fixed. Two through holes are formed at positions where the positioning pins 30a and 30b are provided in a part of the electric circuit 20. The positioning pins 30a and 30b are inserted into the through holes and the positioning pins 30a and 30b are inserted from the surface opposite to the electric circuit 20 by the positioning pin holder 32. This is fixed, and the positional relationship between the electric circuit 20 and the sealing portion 17 is fixed.
As a result, the conductive connecting member 23 is
It is arranged at the center of c and can make electrical connection without displacement. This is the negative terminal take-out part 14
c is desirably as small as possible because it is in the sealing portion. However, when the size is small, it is difficult to position the connecting member directly and indirectly. In the positioning by abutting, the size of the terminal take-out portion 14c is, for example, 2 mm in diameter of the connecting member 23 when the tip is flat. The limit was about 3.5 mm. However, by providing a positioning hole in another portion of the sealing portion, positioning could be performed sufficiently even with a size of 2.8 mm, and no defect due to positioning occurred. As described above, the embodiment is more effective when the terminal take-out portion is smaller. Since the sealing portion is a place where the exterior material is doubled, the strength is relatively high, and even if the above-described positioning hole is provided, it does not break and the positioning accuracy does not decrease. In addition, positioning pin holder 32
Need not necessarily be provided as long as the positioning pins 30a and 30b are not easily detached from the through holes 31. The positioning pins 30a, 30b may have a cylindrical cross section, but it is more effective if a part of the positioning pins 30a, 30b is tapered to facilitate insertion.

FIG. 10 is a partial sectional view of a negative electrode terminal portion of another embodiment of the flat type battery of the present invention. In FIG. 10, electrical connection and mechanical fixing are simultaneously performed by spot welding 34 between the lower surface of the conductive connection member 33 and the terminal extraction portion 14c. In the case where the conductive connection member 33 is pressed against the terminal take-out portion 14c to perform the electrical connection, a member that receives the force applied to the lower surface of the sealing portion or a holding member for the entire battery is required. In the former case, a member that goes around the back surface of the sealing portion is required. In the latter case, this function can be provided in a part of the battery case that integrally seals the battery and the electric circuit. However, when the battery is not pressed, the battery and the electric circuit can be formed separately, but the electrical connection of the pressed portion may become unstable due to impact or the like. In the present embodiment, the negative electrode terminal take-out portion 14c
And the conductive connection member 33 are spot-welded at the portion 34, so that the connection is mechanically fixed with sufficient strength and the electrical connection is made, so that the electrical connection becomes unstable due to impact or the like. Is gone. In addition, the contact portion is not corroded due to long-term aging, making it impossible to make electrical connection or increase impedance. The spot welding could be performed from the back surface of the sealing portion by removing an insulator such as a fusion bonding material in advance. Ultrasonic welding could also be performed from the back side, and could be mechanically fixed with sufficient strength and made an electrical connection. Arc welding, soldering, and the like are similarly effective.

FIG. 11 is a partial sectional view of a negative electrode terminal portion of another embodiment of the flat battery of the present invention. In FIG.
Around the lower part of the conductive connecting member 33, the conductive connecting member 33
The negative electrode terminal take-out portion 14c is fixed with a conductive adhesive 36, and the electric circuit 20 and the exterior material are fixed with an adhesive 35. Connect the conductive connection member 33 to the negative electrode terminal take-out portion 1
In the case where electrical connection is performed by pressing down on the sealing member 4c, a member for receiving a force applied to the lower surface of the sealing portion or a holding member for the entire battery is required. However, by fixing the conductive connection member 33 and the negative electrode terminal take-out portion 14c with a conductive adhesive as in the present embodiment, electrical connection and mechanical fixing can be performed simultaneously. Further, after the adhesive is poured into the terminal take-out portion 14c while being pressed by the conductive connecting member 33, it is only necessary to stop the pressing after drying, which is very simple. As a result, the mechanical connection is made with sufficient mechanical strength and the electrical connection is made, so that the electrical connection does not become unstable due to impact or the like. Also, by fixing the electric circuit 20 and the exterior material with the adhesive 35,
The conductive connection member 33 can be pressed against the negative electrode terminal take-out part 14c without adding a member, so that the conductive connection member 33 and the terminal take-out part 14c can be fixed and electrically connected, and the reliability of the connection part can be improved. Performance can be improved. In addition, the force for pressing the conductive connection member 33 against the terminal take-out portion 14c is 35 or 3 according to the present embodiment.
As long as the adhesive of No. 6 or other members can sufficiently secure the electrical connection, a normal adhesive is effective without using a conductive adhesive. Also, it is sufficiently effective to provide the adhesive only on one of the parts without providing the adhesive on both parts.

FIG. 12 is a sectional view of a negative electrode terminal portion of another embodiment of the flat type battery of the present invention. Reference numeral 25 denotes a positive-electrode-side laminate film, reference numeral 26 denotes a negative-electrode-side laminate film, which forms an exterior material from 25 and 26, and reference numerals 37 and 38 denote films consisting only of a fusion bonding material. The laminated films 25 and 26 have a multilayer structure and are not shown, but are coated on one side of the metal film with a sealing material for sealing, which is also not shown. The surface exposed to the outside opposite to the material is covered with a thermosetting resin. In FIG. 12, the terminal 15 is connected to the laminate film 2
In the case where the terminal 15 is sandwiched and sealed between the terminals 5 and 26, the terminal 15 is exposed to the outside at the negative electrode terminal take-out portion 14c. At this time, since a step is formed in the sealing portion between a position where the terminal is present and a position where the terminal is not present, the flow of the fusion material occurs at the step, and the gap is filled. However, if a thick member is used for the terminal 15, the amount of the fusion material may be insufficient due to the step, and a gap may be generated. There is a case where the sealing performance is reduced around the take-out part 14c. In the present embodiment, a sufficient amount of the fusing material for filling the step portion of the terminal can be supplied to the terminal portion 15 in advance.
Even when a member having a thickness of about 100 microns is used, the sealing performance of the sealing portion can be sufficiently maintained. In addition, even if a thermosetting resin layer is provided for reinforcing the strength of the additional layer in addition to the fusion bonding material, the sealing property can be improved, which is effective.

FIG. 13 is a part of a sectional view of a negative electrode terminal portion of another embodiment. In FIG. 13, the terminal 15 is folded back at the position of the end periphery 39 in the sealing portion, and the terminal 4
It becomes 0 and is overlapped twice with the terminal 15 to form a terminal take-out portion 14c. Since the connection member 23 of the electric circuit 20 is mechanically fixed and electrically connected to the terminal take-out portion 14c, mechanical damage is likely to occur due to an impact during manufacturing or use, and electrical connection is not possible. In the worst case, there is a possibility that the terminal of the sealing portion may be damaged. However, even if the terminals are thickened to increase the strength of the terminals, the sealing performance of the sealing may be reduced by a large step, so that the 15 terminals are about 200
Submicron is common. In this embodiment, 150
By folding the micron terminal 15 twice, it was possible to obtain a terminal strength equivalent to 300 microns without adding any members, and it was also possible to eliminate the instability of the electrical impedance. Although not shown, by making the size of the terminal 40 of the folded portion smaller than the original terminal 15 in width as well as the length, the folded portion 39 is formed.
Other than that, there is no step equivalent to a thickness of 150 microns,
The sealing performance was improved as compared with the case where a terminal having a thickness of 300 microns was used.

[0029]

[Effect] Since the electric circuit and the like and the terminal of the battery are connected in the sealed portion with a simple configuration while maintaining the mechanical strength,
It is possible to provide a flat battery which is small and thin, has excellent sealing airtightness, and is integrated with an electric circuit or the like having high terminal strength.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of one example of a flat battery according to the present invention.

FIG. 2 is a cross-sectional view taken along line AA 'of FIG.

FIG. 3 is a schematic sectional view of another example of the flat battery according to the present invention.

FIG. 4 is a schematic perspective view of another example of the flat battery of the present invention.

FIG. 5 is a sectional view taken along line AA ′ of FIG. 4;

FIG. 6 is a schematic sectional view of one example of a negative electrode terminal portion of the flat battery according to the present invention.

FIG. 7 is a schematic sectional view of a negative electrode terminal portion of another example of the flat battery of the present invention.

FIG. 8 is a schematic sectional view of a negative electrode terminal portion of another example of the flat battery according to the present invention.

FIG. 9 is a sectional view taken along line AA ′ of FIG. 8;

FIG. 10 is a schematic sectional view of a negative electrode terminal portion of another example of the flat battery according to the present invention.

FIG. 11 is a schematic sectional view of a negative electrode terminal portion of another example of the flat battery according to the present invention.

FIG. 12 is a schematic sectional view of a negative electrode terminal portion of another example of the flat battery of the present invention.

FIG. 13 is a schematic sectional view of a negative electrode terminal portion of another example of the flat battery of the present invention.

FIG. 14 is a schematic sectional view of an example of a conventional flat battery.

FIG. 15 is a schematic cross-sectional view of another example of the conventional flat battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode 2 Negative electrode 3 Electrolyte 4 Positive side laminate film (formation of exterior material) 5 Negative side laminate film (formation of exterior material) 6 Sealing part 7 Negative terminal 8 Positive terminal 9 Positive electrode side sealing part 10 Negative electrode side sealing Stop portion 11 Leader terminal portion of metal current collector of negative electrode 12 Fusion layer 13 Fusion layer 14a Negative terminal takeout portion 14b Positive terminal takeout portion 14c Negative terminal takeout portion 15 Negative terminal 16 Sealing portion (terminal takeout portion 17 Sealing portion (sealing portion on terminal side) 18 Sealing portion (sealing portion on both sides of terminal take-out portion) 19a Positive terminal take-out portion 19b Negative terminal take-out portion 20 Battery control electricity Circuit 21a Positive external output terminal 21b Negative external output terminal 23 Electrical connection member 24 Position near the center of negative electrode take-out portion 25 Laminate film 26 Laminated film 27 Conductive connecting member 28 Conductive connecting member 29 Intermediate plate 30a Positioning pin 30b Positioning pin 31 Positioning through hole for sealing portion 32 Positioning pin holder 33 Conductive connecting member 34 Spot welding 35 Adhesive 36 Adhesive 37 Film consisting only of the fusion material 38 Film consisting only of the fusion material 39 Around the end in the sealed portion 40 Terminal

Claims (10)

[Claims] An electrochemical reaction element, an exterior member accommodating the electrochemical reaction element, and an electric terminal for outputting electric energy or electrical information generated from the electrochemical reaction element to the outside of the exterior member. In the flat battery, at least a part of the exterior member is formed as a sealing portion having a film structure, and an electrical terminal that is planarly exposed outside the exterior member in a direction perpendicular to the sealing surface is provided in the sealing portion. A flat type battery characterized by the above-mentioned. 2. The flat battery according to claim 1, wherein electric terminals are provided on both sides of the sealing portion having a film structure. 3. An electric circuit for inputting / outputting electric energy or electric information output from the electric terminal in a direction of laminating with a sealing portion provided with the electric terminal, or at least an electric connection of the electric circuit. The flat battery according to claim 1, further comprising a unit (hereinafter, these are also collectively referred to as an electric circuit). 4. An electric terminal and an electric circuit for inputting / outputting electric energy or electric information output from the electric terminal, wherein the electric terminal in the sealing portion of the film structure is vertically connected to the sealing portion. 4. The flat battery according to claim 3, wherein the flat battery is electrically connected by a penetrating conductive material. 5. A means for arranging a metal plate having a thickness of 0.1 mm or more in a direction parallel to an electric terminal on at least one of the upper and lower surfaces of a sealing portion, and for bringing the metal plate into close contact with the electric terminal. The flat battery according to claim 1, wherein the flat battery is provided. 6. A part of the sealing part, in which no electric terminal is provided, provided with at least one through hole for positioning an electric circuit penetrating the sealing part of the film structure. , 4
Or the flat battery according to 5. 7. A welding portion is provided in an electrical connection portion between an electrical terminal and an electrical circuit, which is planarly exposed to the outside in a direction perpendicular to the sealing surface in the sealing portion. 6. The flat battery according to 6. 8. An electric connection means for electrically connecting an electric terminal and an electric circuit, and a fixing means made of an adhesive is provided on the electric terminal or a sealing portion around the electric terminal and the electric circuit. The flat battery according to claim 3, 4, 5, 6, or 7. 9. The package according to claim 1, wherein at least one or more layers made of a fusion material or an adhesive are additionally provided between the sealing portion covered with the electric terminals and the package.
The flat battery according to 2, 3, 4, 5, 6, 7, or 8. 10. The electric terminal according to claim 1, wherein the electric terminal has a structure folded back in the sealing portion and is doubled at a portion exposed to the outside. 10. The flat-type battery according to 8, 8 or 9.