JP2006049289A - Case for battery, battery, case for electric double layer capacitor, and electric double layer capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a case for a battery or an electric double layer capacitor free from leakage of electrolyte liquid from a gap on the case, not damaging an external circuit board, easily connected to the external circuit board. <P>SOLUTION: The case for a battery or an electric double layer capacitor comprises a ceramic base body 1 on a central part of the upper face, of which a cubic concave part 1a is formed, and a level difference 1c is formed between an inside face of the concave part 1a and a bottom face; a first metallized layer 1d formed on the upper face of the level difference 1c; a second metallized layer 1b formed on the bottom face of the concave part 1a; a first conductor layer 1f and a second conductor layer 1e formed on the lower face of the ceramic base body 1; a plurality of first internal conductors 2d extending through the first metallized layer 1d and the first conductor layer 1f; and plurality of second internal conductors 2b extending through the second metallized layer 1b and the second conductor layer 1e. The number and the sum of cross sections of the second internal conductors 2b are smaller than those of the first internal conductors 2d. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  INDUSTRIAL APPLICABILITY The present invention is a thin battery case and battery, and an electric double layer that can be used for communication equipment such as a mobile phone and can be easily connected to an external electric circuit board and can effectively prevent leakage of electrolyte. The present invention relates to a capacitor case and an electric double layer capacitor.

  In recent years, as portable devices typified by mobile phones, laptop computer terminals, camera-integrated video tape recorders, and the like have developed remarkably, their size and weight have been reduced. In addition, the demand for batteries as power sources for these portable devices continues to increase, and research to increase the energy density of batteries is also actively conducted. In particular, lithium batteries have a small atomic weight and ionization energy. Since the battery uses a large amount of lithium, it has been actively studied as a battery that can obtain a high energy density and can be recharged, and has been widely used to date, including power supplies for portable devices.

  Such a battery has a structure in which a positive electrode and a negative electrode are inserted into a battery case can via an insulating sheet made of an insulating sheet, and an organic electrolyte is injected therein and sealed.

The positive electrode generally includes, for example, a metal oxide as a positive electrode active material and a conductive material added thereto. As the positive electrode active material, lithium cobaltate (LiCoO ₂ ) or lithium manganate (LiMn ₂ O _4). In addition, examples of the conductive material include acetylene black (AB) and graphite. On the other hand, the negative electrode is obtained by adding a conductive material to a negative electrode active material, and as the negative electrode active material, for example, a carbon material such as coke or carbon fiber is used.

The charge / discharge voltage of the positive electrode active material made of LiCoO ₂ or LiMn ₂ O ₄ is about 4V. On the other hand, the charge / discharge voltage of the negative electrode active material made of a carbon material or the like is around 0 V. By combining these positive electrode active material, negative electrode active material, and electrolyte, the lithium battery has a high discharge voltage of about 3.5 V. Have achieved.

  The positive electrode and negative electrode of the battery are made into a slurry by adding the above conductive material to the positive electrode active material or the negative electrode active material, and further adding and mixing a binder such as polytetrafluoroethylene or polyvinylidene fluoride. In general, the sheet is formed into a sheet shape using a blade method, and then the sheet is cut into a circular shape, for example.

  Then, the positive electrode and the negative electrode thus manufactured are placed in the battery case through an insulating sheet made of a polyolefin fiber nonwoven fabric or a polyolefin microporous film having a heat resistant temperature of about 150 ° C. Then, the battery is obtained by injecting the electrolyte solution.

  In order to further reduce the size and density of the battery thus manufactured, the coin-type battery A has been developed so far, and includes a disc-shaped positive electrode 11b as shown in FIG. Further, for example, a positive electrode can 11 made of stainless steel and a negative electrode can 12 made of, for example, stainless steel provided with a disk-like negative electrode 12b are placed through an insulating sheet 14 impregnated with an electrolytic solution, and then, for example, an insulating polypropylene resin An integrated structure is known in which the periphery of the positive electrode can 11 and the periphery of the negative electrode can 12 are caulked through a gasket 15 made of the above. Charging / discharging in the positive electrode 11b and the negative electrode 12b is performed via an external connection terminal member attached to the positive electrode can 11 and the negative electrode can 12 (see, for example, Patent Documents 1 and 2 below).

  Also in the electric double layer capacitor, in order to reduce the size and density of the electric double layer capacitor, the first electrode having the shape shown in FIG. A coin-type electric double layer capacitor A formed by caulking the can 11 and the second electrode can 12 has been developed.

The electric double layer capacitor A includes a first electrode can 11 made of, for example, stainless steel provided with a disk-shaped first electrode 11b, and a second electrode can 12 made of, for example, stainless steel provided with a second electrode 12b. With the insulating sheet 14 containing the electrolytic solution sandwiched between the first electrode 11b and the second electrode 12b, the edge of the first electrode can 11 and the edge of the second electrode can 12 Are formed by caulking and joining to each other via a gasket 15. Charging / discharging in the first electrode 11b and the second electrode 12b is performed via an external connection terminal member attached to the first electrode can 11 and the second electrode can 12 (for example, Patent Document 3 below) 4).
Japanese Unexamined Patent Publication No. 2000-106195 (page 6-12, FIG. 1) JP 2002-198019 (page 3-4, FIG. 1) Japanese Patent Laid-Open No. 2002-50551 JP 2003-100569 A

  However, the conventional battery A or the electric double layer capacitor A as shown in Patent Documents 1 to 4 is subjected to a temperature cycle test (for example, −40 ° C. to 85 ° C.) with a temperature range of hundreds of degrees over a long period. When exposed, the gasket 15 and the positive electrode can 11 are caused by a difference in thermal expansion coefficient between the gasket 15 made of polypropylene resin, the positive electrode can 11 (first electrode can 11) and the negative electrode can 12 (second electrode can 12), for example. And the negative electrode can 12 (or the first electrode can 11 and the second electrode can 12) have a problem that a gap is formed at the boundary with the caulked portion around the periphery and the electrolyte leaks out. Deterioration of the performance of the electric double layer capacitor A), or a problem that the copper (Cu) wiring on the external electric circuit board is corroded and disconnected by the leaked electrolyte, or moisture from this gap Battery A A problem that may cause degradation of the performance of the electric double layer capacitor A) has occurred.

  Further, in order to perform charging / discharging, the conventional battery A or electric double layer capacitor A has to connect external connection terminal members up and down and connect the external connection terminal members to the external electric circuit board. There was a problem that the connection to the electric circuit board was complicated.

  In addition, the conventional battery A or electric double layer capacitor A is used to securely caulk the periphery of the gasket 15, the positive electrode can 11 and the negative electrode can 12 (or the first electrode can 11 and the second electrode can 12) without any gaps. The planar view shape must be circular, and the planar view shape cannot be changed to various shapes such as a polygon. In recent years, with the miniaturization of devices, the market demand for miniaturization and space saving of the battery A (electric double layer capacitor A) has also increased. It was impossible to meet the demand for a square shape.

  Accordingly, the present invention has been completed in view of the above-mentioned problems, and the purpose thereof is to create a gap in the battery due to long-term use, so that the electrolyte solution leaks and deteriorates the battery performance, or the external electric circuit board. It is an object of the present invention to provide a battery case and a battery that can be easily connected to an external electric circuit board without being damaged, can be reduced in size, and are excellent in mass productivity.

  The battery case of the present invention includes a ceramic base having a recess formed in the center of the upper surface and a step formed between one inner surface and the bottom of the recess, and a first formed on the upper surface of the step. A metallization layer; a second metallization layer formed on the bottom surface of the recess; a first conductor layer and a second conductor layer provided on a lower surface of the ceramic substrate; and the first metallization layer to the first metallization layer. A plurality of first inner conductors formed over one conductor layer and a plurality of second inner conductors formed from the second metallization layer to the second conductor layer, The number of the second inner conductors is smaller than the number of the first inner conductors, and the total cross-sectional area thereof is smaller than the total cross-sectional area of the first inner conductor.

  The battery case of the present invention includes a ceramic base having a recess formed at the center of the upper surface, a first metallization layer formed around the recess on the upper surface of the ceramic base, and a bottom surface of the recess. A plurality of second metallized layers formed, a first conductor layer and a second conductor layer provided on the lower surface of the ceramic base, and a plurality of layers are formed from the first metallized layer to the first conductor layer. A first inner conductor and a plurality of second inner conductors formed from the second metallized layer to the second conductor layer, the number of the second inner conductors being It is less than the number of the first inner conductors, and the total cross-sectional area thereof is smaller than the total cross-sectional area of the first inner conductor.

  The battery of the present invention has a battery case having the above configuration, a positive electrode plate placed on the upper surface of the second metallization layer and electrically connected thereto, and an upper surface of the positive electrode plate impregnated with an electrolyte. A negative electrode plate placed in close contact with an insulating sheet and having one end electrically connected to the first metallized layer, and attached to the upper surface of the ceramic base so as to cover the concave portion And a lid.

  The battery of the present invention includes a battery case having the above-described configuration, a positive electrode plate placed on and electrically connected to the upper surface of the second metallization layer, and an electrolyte solution on the upper surface of the positive electrode plate. A negative electrode plate placed so as to be in close contact via an impregnated insulating sheet, and bonded to the upper surface of the ceramic base so as to cover the concave portion, and at least the lower main surface is made conductive, and is conductive And a lid which is connected to the first metallized layer through a resin and is in contact with and electrically connected to the negative electrode plate.

  The electric double layer capacitor case of the present invention is formed on the upper surface of the step with a ceramic base having a recess formed at the center of the upper surface and a step formed between one inner side surface and the bottom surface of the recess. A first metallized layer; a second metallized layer formed on a bottom surface of the recess; a first conductor layer and a second conductor layer provided on a lower surface of the ceramic substrate; and the first metallized layer. A plurality of first inner conductors formed from the first conductor layer to the first conductor layer, and a second inner conductor formed from the second metallization layer to the second conductor layer. The number of the second inner conductors is smaller than the number of the first inner conductors, and the total cross-sectional area thereof is smaller than the total cross-sectional area of the first inner conductor. .

  The case for the electric double layer capacitor of the present invention includes a ceramic base having a recess formed at the center of the upper surface, a first metallization layer formed around the recess on the upper surface of the ceramic base, and a bottom surface of the recess. A plurality of second metallized layers formed on the ceramic substrate, a first conductor layer and a second conductor layer provided on the lower surface of the ceramic base, and a plurality of layers from the first metallized layer to the first conductor layer. And a plurality of second inner conductors formed from the second metallized layer to the second conductor layer, and the number of the second inner conductors is the number of the second inner conductors. Is less than the number of the first inner conductors, and the total cross-sectional area thereof is smaller than the total cross-sectional area of the first inner conductor.

  The electric double layer capacitor of the present invention includes an electric double layer capacitor case having the above structure, a first electrode placed on and electrically connected to the upper surface of the second metallization layer, and the first electrode. A second electrode whose one end is electrically connected to the first metallized layer and is placed on the upper surface of the ceramic substrate, and is placed in close contact with the upper surface of the ceramic substrate through an insulating sheet impregnated with an electrolyte. And a lid attached to cover the recess.

  The electric double layer capacitor of the present invention includes an electric double layer capacitor case having the above structure, a first electrode placed on and electrically connected to the upper surface of the second metallization layer, and the first electrode. A second electrode placed so as to be in close contact with an upper surface of the ceramic substrate through an insulating sheet impregnated with an electrolyte solution, and is bonded to the upper surface of the ceramic base so as to cover the recess, and at least a lower main surface is And a lid that is electrically conductive and is connected to the first metallized layer through a conductive resin and is electrically connected to contact with the second electrode. To do.

  The battery case or the electric double layer capacitor case of the present invention is formed on the upper surface of the step with a ceramic base body in which a recess is formed at the center of the top surface and a step is formed between one inner surface and the bottom surface of the recess. The first metallized layer, the second metallized layer formed on the bottom surface of the recess, the first conductor layer and the second conductor layer provided on the lower surface of the ceramic base, and the first metallized layer A plurality of first inner conductors formed over the first conductor layer, and a plurality of second inner conductors formed from the second metallization layer to the second conductor layer, The number of the inner conductors is smaller than that of the first inner conductor, and the total cross-sectional area thereof is smaller than the total cross-sectional area of the first inner conductor, so that the ceramic base has excellent airtightness and heat resistance. By electrolyte Because it is housed, not that electrolyte leakage occurred gap even when exposed to a temperature cycle test, it is possible to satisfactorily accommodate the electrolyte. In addition, even if the shape of the ceramic substrate in plan view is changed to various shapes such as a quadrangle, the airtightness is maintained, so that the ceramic substrate can be formed in various shapes according to market demands, and moisture and oxygen that degrade performance. And the like can be effectively prevented from entering the electrolyte from the outside.

  In addition, since the ceramic substrate has excellent chemical resistance, it is difficult to be attacked by electrolytes containing organic solvents, acids, etc., and impurities that have melted out of the battery case are mixed into the electrolyte and deteriorate the electrolyte. Therefore, the performance of the battery or the electric double layer capacitor can be maintained well.

  Also, by forming a plurality of first inner conductors and second inner conductors, between the first metallized layer and the first conductor layer, and between the second metallized layer and the second conductor layer, It is possible to suppress the resistance value from increasing during the period, and to prevent the performance of the battery or the electric double layer capacitor from deteriorating.

  Furthermore, the number of second inner conductors is smaller than the number of first inner conductors, and the sum of their cross-sectional areas is smaller than the sum of cross-sectional areas of the first inner conductors. Heat transmitted from the outside (bottom surface) of the battery or the electric double layer capacitor to the electrolyte solution inside (recessed portion) through the inner conductor can be suppressed. Therefore, even when the temperature of the bottom surface of the battery or the electric double layer capacitor rises, the temperature change of the electrolytic solution can be suppressed as much as possible, and the desired performance can always be exhibited. In addition, the resistance value of the first inner conductor can be made closer to the resistance value of the second inner conductor.

  Further, by forming the first conductor layer and the second conductor layer on the lower surface, the first and second conductor layers are joined to the wiring conductor on the surface of the external electric circuit board via solder. Since the wiring conductor of the flat external electric circuit board and the battery or the electric double layer capacitor can be easily connected, the mass production of the external electric circuit board is excellent.

  The battery case or the electric double layer capacitor case of the present invention includes a ceramic base having a recess formed in the center of the upper surface, a first metallization layer formed around the recess on the upper surface of the ceramic base, A second metallized layer formed on the bottom surface, a first conductor layer and a second conductor layer provided on the lower surface of the ceramic base, and a plurality of layers were formed from the first metallized layer to the first conductor layer. A first inner conductor and a plurality of second inner conductors formed from the second metallization layer to the second conductor layer, the number of the second inner conductors being the first inner conductor Less than the number of conductors, and the total cross-sectional area thereof is smaller than the total cross-sectional area of the first inner conductor, so that the electrolyte is accommodated by a ceramic base that is excellent in airtightness and heat resistance. Because not be electrolyte leakage occurred gap even when exposed to a temperature cycle test, it is possible to satisfactorily accommodate the electrolyte. In addition, even if the shape of the ceramic substrate in plan view is changed to various shapes such as a quadrangle, the airtightness is maintained, so that the ceramic substrate can be formed in various shapes according to market demands, and moisture and oxygen that degrade performance. And the like can be effectively prevented from entering the electrolyte from the outside.

  In addition, since the ceramic substrate is excellent in chemical resistance, it is difficult to be attacked by an electrolytic solution containing an organic solvent or an acid, and impurities dissolved from the battery case or the electric double layer capacitor case are mixed in the electrolytic solution. Thus, the performance of the battery or the electric double layer capacitor can be maintained well without deteriorating the electrolyte.

  Also, by forming a plurality of first inner conductors and second inner conductors, between the first metallized layer and the first conductor layer, and between the second metallized layer and the second conductor layer, It is possible to suppress the resistance value from increasing during the period, and to prevent the performance of the battery or the electric double layer capacitor from deteriorating.

  Furthermore, the number of second inner conductors is smaller than the number of first inner conductors, and the sum of their cross-sectional areas is smaller than the sum of cross-sectional areas of the first inner conductors. Heat transmitted from the outside (bottom surface) of the battery or the electric double layer capacitor to the electrolyte solution inside (recessed portion) through the inner conductor can be suppressed. Therefore, even when the temperature of the bottom surface of the battery or the electric double layer capacitor rises, the temperature change of the electrolytic solution can be suppressed as much as possible, and the desired performance can always be exhibited. In addition, the resistance value of the first inner conductor can be made closer to the resistance value of the second inner conductor.

  Further, by forming the first conductor layer and the second conductor layer on the lower surface, the first and second conductor layers are joined to the wiring conductor on the surface of the external electric circuit board via solder. Since the wiring conductor of the flat external electric circuit board and the battery or the electric double layer capacitor can be easily connected, the mass production of the external electric circuit board is excellent.

  The battery of the present invention has the battery case of the present invention, a positive electrode plate placed on the upper surface of the second metallization layer and electrically connected thereto, and an upper surface of the positive electrode plate impregnated with an electrolytic solution. A negative electrode plate placed in close contact with the insulating sheet and having one end electrically connected to the first metallization layer; and a lid attached to the upper surface of the ceramic substrate so as to cover the recess. Thus, a battery with high airtight reliability and low internal resistance using the battery case of the present invention is obtained.

  The battery of the present invention includes the battery case of the present invention, a positive electrode plate placed on and electrically connected to the upper surface of the second metallization layer, and an electrolyte solution on the upper surface of the positive electrode plate. A negative electrode plate placed so as to be in close contact via the impregnated insulating sheet, and joined to the upper surface of the ceramic base so as to cover the recess, and at least the lower main surface is made conductive, and a conductive resin is used. Airtight reliability using the battery case of the present invention described above, comprising a lid that is connected to the first metallized layer via the negative electrode plate and electrically connected to the first metallized layer High internal resistance and low internal resistance.

  Further, at least the lower main surface is electrically conductive and is connected to the first metallized layer via the conductive resin and brought into contact with the negative electrode plate to be electrically connected and joined to the upper surface of the substrate. Thus, the lid can function as the negative electrode of the battery without providing a step between one inner side surface and the bottom surface of the concave portion of the base. As a result, the base can be further reduced in size, and the battery element can be easily mounted inside the recess of the base.

  The electric double layer capacitor of the present invention includes an electric double layer capacitor case configured as described above, a first electrode placed on and electrically connected to the upper surface of the second metallization layer, and an upper surface of the first electrode. A second electrode whose one end is electrically connected to the first metallized layer and covering the recess on the upper surface of the ceramic substrate. Since the attached lid is provided, the electric double layer capacitor having high hermetic reliability and low internal resistance using the electric double layer capacitor case of the present invention is obtained.

  The electric double layer capacitor of the present invention includes an electric double layer capacitor case configured as described above, a first electrode placed on the upper surface of the second metallization layer and electrically connected thereto, and a first electrode. A second electrode placed in close contact with the upper surface of the ceramic substrate through an insulating sheet impregnated with an electrolyte, and is bonded to the upper surface of the ceramic base so as to cover the recess, and at least the lower main surface is electrically conductive And a lid body that is connected to the first metallized layer through a conductive resin and is in contact with and electrically connected to the second electrode. Airtight reliability using a double layer capacitor case is high, and the internal resistance is low.

  In addition, a lid having at least a lower main surface conductive is connected to the first metallized layer through a conductive resin, and brought into contact with the second electrode to be electrically connected, and bonded to the upper surface of the substrate. By doing so, the lid can be made to function as a current collecting plate of the electric double layer capacitor without providing a step between one inner side surface and the bottom surface of the concave portion of the base. As a result, the size of the base can be further reduced, and the electric double layer capacitor element can be easily mounted inside the recess of the base.

  The battery case or electric double layer capacitor case of the present invention will be described in detail below. 1, (a) is a cross-sectional view showing an example of an embodiment of a battery case or an electric double layer capacitor case of the present invention, and (b) is a battery case or electric double layer capacitor of (a). The top view of a case is shown. 2A is a cross-sectional view showing another example of the battery case or electric double layer capacitor case of the present invention, and FIG. 2B is the battery case of FIG. The top view of the case for electric double layer capacitors is shown. 3A is a cross-sectional view showing still another example of the embodiment of the battery case or electric double layer capacitor case of the present invention, and FIG. 3B is the battery case of FIG. Or the top view of the case for electric double layer capacitors is shown. FIG. 1 and FIG. 2 show the first embodiment of the battery case or electric double layer capacitor case of the present invention, and FIG. 3 shows the battery case or electric double layer capacitor of the present invention. The second embodiment of the case is assumed. In addition, since the battery case and the electric double layer capacitor case of the present invention have the same configuration, the battery case will be described below as an example.

  In these figures, 1 is a ceramic substrate, 1a is a recess, 1b is a second metallized layer, 1c is a step, 1d is a first metallized layer, 2b is a second inner conductor, 2d is a first inner conductor, Reference numeral 4 denotes a lid. In FIG. 1B, FIG. 2B, and FIG. 3B, the first metallized layer 1d and the second metallized layer 1b are cross-hatched. It is for the purpose, and does not show a cross section.

  In the first embodiment of the battery case of the present invention, a concave portion 1a having a rectangular parallelepiped shape, a prismatic shape, a cylindrical shape, or the like is formed at the center portion of the upper surface of the ceramic substrate 1, and one inner side surface and bottom surface of the concave portion 1a are formed. A step 1c is formed between the two. A first metallized layer 1d is formed on the top surface of the step 1c, and a second metallized layer 1b is formed on the bottom surface of the recess 1a. Furthermore, a first conductor layer 1f and a second conductor layer 1e are formed on the lower surface of the ceramic substrate 1, and a plurality of first conductor layers 1f are formed from the first metallized layer 1d to the first conductor layer 1f. And a plurality of second inner conductors 2b formed from the second metallized layer 1b to the second conductor layer 1e. The number of the second inner conductors 2b is smaller than the number of the first inner conductors 2d, and the total cross-sectional area of the second inner conductor 2b is larger than the total cross-sectional area of the first inner conductor 2d. small.

Such a ceramic substrate 1 is made of ceramics such as an alumina sintered body, and is manufactured as follows. For example, when the ceramic substrate 1 is made of an alumina sintered body, an organic material suitable for a raw material powder such as aluminum oxide (Al ₂ O ₃ ), silicon oxide (SiO ₂ ), magnesium oxide (MgO), calcium oxide (CaO), etc. A binder, a solvent, etc. are added and mixed to form a slurry. This slurry is made into a green sheet by a doctor blade method or a calender roll method and cut into a required size. Next, in order to form the recess 1a, the step 1c, the first and second inner conductors 2b, 2d, etc. in a plurality of green sheets selected from them, an appropriate punching process is performed.

  Then, through holes formed by drilling with a mold or the like in these green sheets are filled with a metal paste mainly composed of metal powder such as tungsten (W), or metal powder such as W is mainly composed. The first and second metallized layers 1d and 1b, the first and second inner conductors 2d and 2b, and the first and second conductor layers 1f and 1e Next, the green sheets on which these conductor layers are formed are stacked and fired at a temperature of about 1600 ° C., thereby producing the ceramic substrate 1.

  As shown in FIGS. 1 (a), 2 (a), and 3 (a), the first and second conductor layers 1f and 1e are formed on the lower surface of the ceramic substrate 1, whereby the ceramic substrate 1 is formed. It is placed on the upper surface of a flat external electric circuit board and can be easily connected to the external electric circuit by soldering or the like.

  Further, in FIG. 1, the first and second inner conductors 2d and 2b are formed only by through connection conductors perpendicular to the first and second conductor layers 1f and 1e. It may be formed in combination with an internal wiring layer parallel to the first and second conductor layers 1f and 1e, whereby an electric circuit can be routed in the ceramic substrate 1, and the first and second conductor layers 1f. , 1e can be formed at a suitable position on the bottom surface of the ceramic substrate 1. As a result, the first and second inner conductors 2d and 2b in FIG. 1 can be formed separately on both sides, for example, in addition to the form in which the first and second inner conductors 2d and 2b are formed in one row on each of the left and right sides. It can be arranged.

  Preferably, the first and second inner conductors 2d and 2b are through-connection conductors on the side in contact with the recess 1a, that is, on the connection portion with the first and second metallized layers 1d and 1b. When the first and second metallized layers 1d and 1b are connected by an interlayer conductor formed between the layers of the ceramic green sheet, delamination (bonding between the stacked green sheets is performed at the portion of the ceramic green sheet where the interlayer conductor is formed. Separation that occurs because the force is weak) is likely to occur, and there is a possibility that the electrolytic solution sealed in the concave portion 1a of the ceramic substrate 1 may enter the gap between the ceramic green sheets that sandwich the conductor layer generated by this. When the first and second inner conductors 2d and 2b are through-connection conductors, the end surfaces are connected to the first and second metallized layers 1d and 1b made of the same material as the through-connection conductor and covered with them, There is less possibility that an electrolyte enters due to a gap in the joint.

  A plurality of first inner conductors 2d are formed from the first metallized layer 1d to the first conductor layer 1f, and a plurality of second inner conductors 2b are formed from the second metallized layer 1b to the second conductor layer 1e. The number of the second inner conductors 2b formed is smaller than the number of the first inner conductors 2d, and the total cross-sectional area of the second inner conductor 2b is larger than the total cross-sectional area of the first inner conductor 2d. It is getting smaller.

  With this configuration, a plurality of first inner conductors 2d and second inner conductors 2b are formed, and therefore, between the first metallized layer 1d and the first conductor layer 1f and the second metallized layer 1b. And the second conductor layer 1e can be prevented from increasing in resistance value and battery performance can be prevented from deteriorating.

  Preferably, the first and second metallized layers 1d and 1b, the first and second inner conductors 2d and 2b, and the conductor layers that become the first and second conductor layers 1f and 1e contain copper (Cu). It is good to do. With this configuration, the electrical resistance values of the first and second metallized layers 1d and 1b, the first and second inner conductors 2d and 2b, and the first and second conductor layers 1f and 1e are lowered. It is possible to effectively prevent the battery performance from deteriorating.

  More preferably, the first and second metallized layers 1d and 1b, and the first and second conductor layers 1f and 1e are formed of a conductor layer containing 10% by volume to 70% by volume of Cu and 30% by volume to 90% of W. The first and second inner conductors 2d and 2b preferably contain 20% by volume to 80% by volume of Cu and W at a rate of 20% by volume to 80% by volume. It is preferable that the Cu content in the first and second inner conductors 2d and 2b is larger than that of the conductor layers to be the first and second metallized layers 1d and 1b and the first and second conductor layers 1f and 1e. . As a result, the first and second metallized layers 1d, 1b and the first and second conductive layers 1f, 1e can be effectively prevented from being corroded by the electrolytic solution, and the battery performance is deteriorated. Therefore, a battery that functions stably over a long period of time can be obtained.

A method of containing Cu in these conductor layers will be specifically described in the case of using ceramics mainly composed of Al ₂ O ₃ for the ceramic substrate 1. First, in order to form the ceramic substrate 1, a powder having an average particle size of 0.5 to 2.5 μm, preferably 0.5 to 2 μm, is used as the Al ₂ O ₃ raw material powder as the main component. This is because if the average particle size is smaller than 0.5 μm, it is difficult to handle the powder, and the cost of the powder becomes higher. If it is larger than 2.5 μm, it becomes difficult to fire at a temperature of 1500 ° C. or less. This is because the problem of evaporating the Cu component of the conductor layer occurs.

Then, with respect to the _Al 2 _{O 3} powder, as a second component, the MnO ₂ 2 to 6% by weight, preferably added in a proportion of 3-5 wt%. In addition, as appropriate, as a third component, 0.4 to 8% by mass of SiO ₂ , MgO, CaO powder or the like, and as a fourth component, a metal powder or oxide powder of a transition metal such as W or Mo is used as a coloring component. It is added at a rate of 2% by mass or less in terms of conversion.

  And the sheet-like molded object (green sheet) for forming an insulating layer using this mixed powder is produced. The sheet-like molded body can be produced by a known molding method. For example, after preparing a slurry by adding an organic binder or solvent to the above mixed powder, it is formed by a doctor blade method, or an organic binder is added to the mixed powder, and sheet-like molding with a predetermined thickness is performed by press molding, rolling molding, etc. The body can be made.

  Containing 10 to 80% by volume of Cu powder having an average particle size of 1 to 10 μm and 20 to 90% by volume of W powder having an average particle size of 1 to 10 μm with respect to the sheet-like molded body thus prepared A conductor paste to be prepared is prepared, and this paste is printed and applied to each sheet-like molded body by a method such as screen printing or gravure printing, whereby Cu can be contained in these conductor layers.

  Further, since the second inner conductor 2b is formed to be fewer than the first inner conductor 2d, the electrolyte solution inside the battery (recessed portion) is transferred from the outside of the battery (bottom surface of the battery) via the second inner conductor 2b. The transmitted heat can be suppressed. Therefore, even when the temperature of the bottom surface of the battery rises, the temperature change of the electrolytic solution can be suppressed as much as possible, and desired battery performance can always be exhibited. In addition, the resistance value of the first inner conductor 2d can be made closer to the resistance value of the second inner conductor 2b.

  The sum of the cross-sectional areas of the plurality of second inner conductors 2b is smaller than the sum of the cross-sectional areas of the plurality of first inner conductors 2d, but the cross-sectional areas of the individual second inner conductors 2b are smaller than the individual first inner conductors 2b. Since the cross-sectional area is slightly larger than the cross-sectional area of the internal conductor 2d and the number of the second internal conductors 2b is smaller than the number of the first internal conductors 2d, the total cross-sectional area of the plurality of second internal conductors 2b May be smaller than the sum of the cross-sectional areas of the plurality of first inner conductors 2d, or the cross-sectional areas of the individual first inner conductors 2d may be smaller than the cross-sectional areas of the individual second inner conductors 2b. Are the same or slightly larger in cross-sectional area, and the number of the first inner conductors 2d is not so much larger than that of the second inner conductor 2b, the total of the sectional areas of the plurality of second inner conductors 2b is the plurality of first inner conductors 2b. To be smaller than the total cross-sectional area of the inner conductor 2d It may be.

  Preferably, the cross-sectional area of each of the first inner conductors 2d is the same as or slightly larger than the cross-sectional area of each of the second inner conductors 2b. The temperature change of the liquid can be effectively suppressed, and the resistance value of the first inner conductor 2d longer than the second inner conductor 2b can be made closer to the resistance value of the second inner conductor 2b.

  Further, the exposed surface of these conductor layers formed on the ceramic substrate 1 thus produced has a metal excellent in corrosion resistance and wettability with solder, specifically having a thickness of 1 to 12 μm. A nickel (Ni) layer and a gold (Au) layer having a thickness of 0.3 to 5 μm are preferably sequentially deposited by a plating method or the like. Thereby, in particular, it is possible to effectively suppress the first and second metallized layers 1d and 1b formed inside the battery case from being easily eluted into the electrolytic solution by the voltage due to charging and discharging. Further, the first and second conductor layers 1f and 1e have better wettability with solder, and the bonding strength with the wiring conductor on the external electric circuit board becomes stronger.

  If the thickness of the Ni layer is less than 1 μm, it becomes difficult to prevent the oxidative corrosion of each conductor layer made of metallization and to effectively prevent the metal component from eluting from each conductor layer. Tends to deteriorate. On the other hand, if the thickness of the Ni layer exceeds 12 μm, it takes a long time to form the plating, so that the mass productivity is likely to be lowered and the electric resistance is likely to be increased.

  Further, if the thickness of the Au layer is less than 0.3 μm, it is difficult to form an Au layer having a uniform thickness, and a portion where the Au layer is extremely thin or a portion where the Au layer is not formed is likely to occur. The effect of preventing oxidative corrosion and the wettability with solder are likely to decrease. On the other hand, if the thickness of the Au layer exceeds 5 μm, it takes a long time to form the plating, and the mass productivity tends to decrease.

  Preferably, as shown in FIG. 2, a metal frame-like member made of iron (Fe) -Ni-cobalt (Co) alloy, aluminum (Al), or the like so as to surround the recess 1a on the upper surface of the ceramic substrate 1. 3 is preferably brazed via silver (Ag) brazing, Al brazing, or the like. With this configuration, by placing a metal lid 4 on the frame-like member 3 and adopting a welding method such as a seam welding method for the lid 4, the concave portion 1 a of the ceramic substrate 1 can be reliably and efficiently operated. The inside can be hermetically sealed.

  Further, in this case, a metallized layer made of W or the like is formed on a portion where the frame-like member 3 on the upper surface of the ceramic substrate 1 is brazed, and the surface thereof is preferably plated with Ni or the like. With this configuration, the wettability with the brazing material on the upper surface of the ceramic substrate 1 is improved, and the bonding strength between the upper surface of the ceramic substrate 1 and the frame-shaped member 3 becomes stronger. Moreover, the frame-shaped member 3 may be one in which an aluminum layer is formed on the surface of an iron-nickel-cobalt alloy, and can be made difficult to be affected by the electrolytic solution by the aluminum layer.

  More preferably, the frame-shaped member 3 has a rectangular shape whose section is long in the vertical direction. When the lid 4 is welded and joined to the frame-like member 3, the outer periphery of the lid 4 is thermally expanded, resulting in a difference in thermal expansion between the base body 1 and the lid body 4. The difference in thermal expansion from the lid 4 can be easily absorbed by the frame member 3, and it is possible to effectively prevent the thermal stress due to the thermal expansion difference from the lid 4 from being applied to the ceramic base 1. As a result, breakage such as cracks can be prevented from occurring in the ceramic substrate 1, and the inside of the recess 1a can be more securely and airtightly maintained.

  In FIG. 1, a lid 4 made of ceramic such as an alumina sintered body, a metal such as an Fe-Ni-Co alloy or an Al alloy, or a resin such as an epoxy resin is placed on the upper surface of the ceramic substrate 1. The inside of the ceramic substrate 1 can be hermetically sealed by bonding through a brazing material such as Al brazing or an adhesive made of resin, or by bonding by an ultrasonic bonding method and covering the concave portion 1a of the ceramic substrate 1.

  Further, in FIG. 2, the frame-like member 3 is covered with a lid 4 made of a metal such as an Fe—Ni—Co alloy or an Al alloy by welding or ultrasonic bonding to cover the recess 1 a of the ceramic substrate 1, thereby The inside of the substrate 1 can be surely hermetically sealed. Accordingly, it is possible to prevent moisture, oxygen, and the like from entering the electrolyte solution inside the ceramic substrate 1 through the interface between the ceramic substrate 1 and the lid 4 from the outside.

Next, a second embodiment of the battery case of the present invention will be described with reference to FIG.
In the second embodiment of the battery case of the present invention, a rectangular parallelepiped recess 1a is formed at the center of the upper surface of the ceramic substrate 1, and the first metallization layer is formed around the recess 1a on the upper surface of the ceramic substrate 1. 1d is formed, and a second metallized layer 1b is formed on the bottom surface of the recess 1a. Furthermore, a first conductor layer 1f and a second conductor layer 1e are formed on the lower surface of the ceramic substrate 1, and a plurality of first conductor layers 1f are formed from the first metallized layer 1d to the first conductor layer 1f. And a plurality of second inner conductors 2b formed from the second metallized layer 1b to the second conductor layer 1e. The number of the second inner conductors 2b is smaller than the number of the first inner conductors 2d, and the total cross-sectional area of the second inner conductor 2d is larger than the total cross-sectional area of the first inner conductor 2d. small.

  The second embodiment of the battery case of the present invention differs from the first embodiment in that no step 1c is formed between one side surface and the bottom surface of the recess 1a of the ceramic substrate 1. The first metallized layer 1d is only formed around the recess 1a on the upper surface of the ceramic substrate 1, and the formation method of the first embodiment is changed according to the difference in shape and position. Thus, the battery case of the second embodiment can be obtained. The same characteristics as those of the battery case of the first embodiment can be obtained except that the formation position of the first metallized layer 1d is different. Therefore, the description other than the first metallized layer 1d is omitted below.

  In the second embodiment, the first metallized layer 1d is formed around the recess 1a on the upper surface of the ceramic substrate 1 as shown in FIGS. By electrically connecting a lid 4 having at least a lower surface conductive to the first metallized layer 1d on the upper surface of the ceramic substrate 1, a gap between the inner surface and the bottom surface of the recess 1a of the substrate 1 is shown in FIG. And it can be made to function as a battery, without providing the level | step difference 1c as shown in FIG. As a result, the substrate 1 can be reduced in size, and the battery element can be easily mounted inside the recess 1 a of the substrate 1.

  In FIG. 3, the first metallized layer 1d is formed over the entire periphery of the recess 1a on the upper surface of the ceramic substrate 1, but is formed only on a portion electrically connected to the first inner conductor 2d. May be. However, the formation over the entire circumference around the recess 1a is preferable in that the connection resistance with the lid 4 can be lowered.

  In addition, as compared with the first embodiment, the length of the first inner conductor 2d is increased, and the electrical resistance of the first inner conductor 2d is increased. The electrical resistance can be prevented from becoming too large by increasing the number or increasing the total cross-sectional area.

  Also in the second embodiment, as shown in FIG. 2, a metal frame-like member 3 may be brazed to the first metallized layer 1 d on the upper surface of the ceramic substrate 1, and the lid 4 is attached. In addition to being able to be joined efficiently, the inside of the recess 1a can be more reliably hermetically sealed.

  Next, the battery of the present invention will be described in detail below. 4 is a cross-sectional view showing a battery (referred to as battery B) using the battery case according to the first embodiment of FIG. 1 as an example of the embodiment of the battery of the present invention, and FIG. It is sectional drawing which shows the battery (it is set as the battery C) using the battery case by 2nd embodiment of FIG. 3 as another example of embodiment of a battery, B-1 is a positive electrode plate, B-2 is a negative electrode plate, B-3 is an insulating sheet, B-4 is an electrolytic solution, and B or C is a battery.

  The battery B of the present invention includes the battery case according to the first embodiment, the positive electrode plate B-1 placed on the upper surface of the second metallized layer 1b and electrically connected thereto, and the positive electrode plate B-1. A negative electrode which is placed so as to be in close contact with the upper surface of the electrode plate B-1 via an insulating sheet B-3 impregnated with an electrolytic solution B-4 and whose one end is electrically connected to the first metallized layer 1d. An electrode plate B-2 and a lid 4 attached to the upper surface of the ceramic substrate 1 so as to cover the recess 1a are provided.

  The battery C of the present invention includes a battery case according to the second embodiment, a positive electrode plate B-1 placed on the upper surface of the second metallized layer 1b and electrically connected thereto, The negative electrode plate B-2 placed in close contact with the upper surface of the positive electrode plate B-1 via an insulating sheet B-3 impregnated with the electrolytic solution B-4, and the ceramic base so as to cover the recess 1a 1 is bonded to the upper surface of 1 and at least the lower main surface is made conductive, and is connected to the first metallized layer 1d through a conductive resin and is brought into contact with the negative electrode plate B-2 to electrically And a connected lid 4.

  As a result, the batteries B and C of the present invention have high hermetic reliability using the battery case of the present invention and are excellent in mass productivity. Further, the first and second metallized layers 1d and 1b can be connected to the negative electrode plate B-2 and the positive electrode plate B-1, respectively. As a result, the batteries B and C function as batteries. .

The positive electrode plate B-1 is a plate or sheet having a positive electrode active material such as LiCoO ₂ or LiMn ₂ O ₄ and a conductive material such as acetylene black or graphite, and the negative electrode plate B-2 is It is a plate or sheet containing a negative electrode active material made of a carbon material such as coke or carbon fiber.

  The positive electrode plate B-1 and the negative electrode plate B-2 are prepared by adding the conductive material to the positive electrode active material or the negative electrode active material, and adding and mixing a binder such as polytetrafluoroethylene or polyvinylidene fluoride to form a slurry. The sheet is formed into a sheet using a well-known doctor blade method, and the sheet is then cut into, for example, a circle.

  The insulating sheet B-3 is made of a non-woven fabric made of polyolefin fiber, a microporous membrane made of polyolefin, and the like, impregnated with the electrolytic solution B-4, and between the positive electrode plate B-1 and the negative electrode plate B-2. By being placed between, the contact between the positive electrode plate B-1 and the negative electrode plate B-2 is prevented, and the electrolytic solution B- between the positive electrode plate B-1 and the negative electrode plate B-2. 4 movements are possible.

  The electrolytic solution B-4 is injected into the batteries B and C from the upper surface of the recess 1a using an injection means such as a syringe. Then, the inside of the batteries B and C can be hermetically sealed by airtightly bonding the lid 4 to the upper surface of the ceramic substrate 1 or the frame-like member 3 after the injection.

  In the battery B of FIG. 4, a lid 4 made of ceramic such as an alumina sintered body, metal such as Fe—Ni—Co alloy or Al alloy, resin such as epoxy resin, etc. on the upper surface of the ceramic substrate 1. Are bonded by a brazing material such as Ag brazing or Al brazing, or an adhesive made of resin, or are joined by an ultrasonic joining method to cover the concave portion 1a of the ceramic base 1 so that the inside of the ceramic base 1 is hermetically sealed. Thus, the battery B is obtained.

  When the battery case shown in FIG. 2 is used in the battery B, the lid 4 made of metal such as Fe—Ni—Co alloy or Al alloy is welded to the frame member 3 to cover the recess 1 a of the ceramic substrate 1. As a result, the inside of the ceramic substrate 1 can be reliably hermetically sealed. Accordingly, it is possible to more effectively suppress moisture, oxygen, and the like from entering the electrolyte solution inside the ceramic substrate 1 through the interface between the ceramic substrate 1 and the lid 4 from the outside.

  Further, in the battery C of FIG. 5, the lid 4 is specifically an insulation such as a metal such as an Fe—Ni—Co alloy or an Al alloy, a ceramic such as an alumina sintered body, or a resin such as an epoxy resin. When the lid 4 is made of an insulator, at least the lower main surface is formed with a metal layer 4a formed by depositing a metal such as Ni or Al by vapor deposition or the like. A battery C is formed by airtightly sealing the inside of the ceramic substrate 1 by bonding through a conductive adhesive made of a resin containing a brazing material such as Al brazing or a metal such as Ag and covering the recess 1a of the ceramic substrate 1. It becomes.

  Preferably, at least the lower main surface of the lid body 4 is made of Al. With this configuration, the cover 4 can form a passive film having excellent corrosion resistance on the surface, effectively preventing the cover 4 from being corroded by the electrolyte B-4 or the external atmosphere, and the inside of the batteries B and C. The airtight reliability can be made very excellent.

  The lid 4 is formed on the lower main surface of a plate material made of Al, a plate material in which an Al layer is formed on the lower main surface of a plate material made of ceramics, or a plate material such as an Fe-Ni-Co alloy or Fe-Ni alloy. An Al layer may be formed. Further, it is preferable that a protrusion (a portion protruding linearly) is formed on the outer peripheral portion of the lower main surface of the lid body 4 over the entire periphery. If the cover 4 is a plate material made of Al, this protrusion is formed simultaneously when the cover 4 is punched with a press, or after punching, a so-called coining method (restraining the side of the workpiece). By limiting the escape area of the meat and transferring the concave / convex pattern of the mold onto the surface of the workpiece by overlapping the mold with the irregularities formed on the mold surface and pressing the workpiece from above and below) For example, it is provided by forming it into a triangular shape with a height of about 0.1 mm and a cross section projecting downward.

  Further, if the lid 4 is made of a plate material having an Al layer formed on the lower main surface thereof such as an Fe-Ni-Co alloy, the ingot of these metals is rolled to have a thickness of 0.2 to 0.5, for example. For example, a 0.1 mm-thickness Al plate can be clad-bonded to the surface of the plate when it is made into a mm plate, and then the protrusions can be formed by the coining method.

  Then, an aluminum layer is formed on the upper surface of the metallization layer for metal bonding, the frame-shaped member 3 or the first metallization layer 1d provided around the recess 1a on the upper surface of the ceramic substrate 1, and the lid 4 The protrusion formed on the outer peripheral portion of the cover 4 is placed in contact with the cover 4, and by applying ultrasonic waves of about several tens of kHz from the upper surface of the cover 4, the protrusion on the lower surface of the cover 4 is It is joined to the aluminum layer on the ceramic substrate 1 side while being crushed along the unevenness of the aluminum layer on the upper surface on the ceramic substrate 1 side. At this time, even when the upper surface of the ceramic substrate 1 is warped or undulated, the ceramic base 1 is joined due to the different size of the protrusions. Then, according to this ultrasonic bonding method, the lid 4 can be firmly bonded without impairing the airtightness in the recesses 1a of the batteries B and C.

  More specifically, the ultrasonic bonding method is performed as follows, for example. That is, the ceramic base body 1 and the lid 4 that are the objects to be joined are set between a horn (square-shaped fixing base) having a chip serving as a vibration medium at the lower end of the tip and an anvil (anvil), and the chip is mounted. For example, a horizontal ultrasonic vibration of 15 to 30 kHz is applied while continuously moving along the outer periphery of the lid 2 while applying a pressure of about 30 to 50 N vertically. Alternatively, a method may be used in which bonding of a certain length is performed in a short time by increasing the pressure in the vertical direction with the shape of the chip as a line.

  In the ultrasonic bonding method, at the initial stage when ultrasonic vibration is applied, an oxide film or dirt on the surface of the bonded portion is pushed out toward the outer side of the bonded portion, and the aluminum crystal grains of the aluminum layer on the lid 4 and the ceramic substrate 1 side. By approaching each other until the interatomic distance is reached, a mutual attractive force acts between the atoms to obtain a strong bond. At this time, a temperature of 1/3 or less of the melting point of the metal in the method of melting and joining ordinary metals is locally generated, but with such a heat, the electrolyte solution B-4 hardly changes, Thus, the battery life can be extended.

  Furthermore, according to the ultrasonic bonding method, other metals hardly diffuse into Al, and therefore, a bonded portion having further corrosion resistance can be formed with respect to the electrolytic solution B-4.

  The electrolytic solution B-4 is obtained by dissolving a lithium salt such as lithium tetrafluoroborate or an acid such as hydrochloric acid, sulfuric acid or nitric acid in an organic solvent such as dimethoxyethane or propylene carbonate.

  Such an electrolytic solution B-4 is highly corrosive and soluble, but by using the batteries B and C of the present invention, the ceramic substrate 1 is excellent in chemical resistance. It is difficult to be attacked by the electrolytic solution B-4 containing an acid or the like, and the battery performance is good without the impurities dissolved from the battery case B being mixed in the electrolytic solution B-4 and degrading the electrolytic solution B-4. Can be maintained.

  Further, in the metal case that has been conventionally used, as shown in FIG. 6, the positive electrode can 11 and the negative electrode can 12 are integrated by caulking them with a gasket 15 made of polypropylene resin or the like. The thickness of the caulked portion is about 2 mm in total of the positive electrode can 11, the negative electrode can 12, and the insulating sheet 14, whereas according to the present invention, the thickness is 1 mm because there is no need for caulking. It can be made below, and can greatly contribute to thinning of the portable device.

  Next, the electric double layer capacitor case and the electric double layer capacitors B and C of the present invention have the same configuration and operational effects as the battery case and the batteries B and C.

  That is, the electric double layer capacitor case of the present invention shown in FIG. 1 has a rectangular parallelepiped, prismatic or cylindrical recess 1a formed at the center of the upper surface, and between the inner surface and the bottom surface of the recess 1a. Provided on the lower surface of the ceramic substrate 1, the ceramic substrate 1 on which the step 1 c is formed, the first metallized layer 1 d formed on the upper surface of the step 1 c, the second metallized layer 1 b formed on the bottom surface of the recess 1 a, and First conductor layer 1f and second conductor layer 1e thus formed, a plurality of first inner conductors 2d formed from first metallization layer 1d to first conductor layer 1f, and second metallization layer 1b A plurality of second inner conductors 2b formed from the second conductor layer 1e to the second conductor layer 1e, and the number of the second inner conductors 2b is less than the number of the first inner conductors 2d, The total cross-sectional area of Of is smaller than the sum of the cross sectional area of the internal conductor 2d.

  Also, the electric double layer capacitor B of the present invention shown in FIG. 4 has an electric double layer capacitor case configured as described above and a first electrode placed on and electrically connected to the upper surface of the second metallized layer 1b. B-1 is placed so as to be in close contact with the upper surface of the first electrode B-1 via an insulating sheet B-3 impregnated with an electrolytic solution B-4, and one end thereof is placed on the first metallized layer 1d. The second electrode B-2 is electrically connected, and the lid 4 is attached to the upper surface of the ceramic substrate 1 so as to cover the recess 1a.

  In another example of the embodiment of the electric double layer capacitor case of the present invention shown in FIG. 3, the ceramic substrate 1 having a recess 1a formed in the center of the upper surface, and the periphery of the recess 1a on the upper surface of the ceramic substrate 1 The first metallized layer 1d formed on the bottom surface, the second metallized layer 1b formed on the bottom surface of the recess 1a, the first conductor layer 1f and the second conductor layer 1e provided on the lower surface of the ceramic substrate 1. A plurality of first inner conductors 2d formed from the first metallized layer 1d to the first conductor layer 1f, and a plurality of second inner conductors formed from the second metallized layer 1b to the second conductor layer 1e. The number of the second inner conductors 2b is smaller than the number of the first inner conductors 2d, and the total cross-sectional area thereof is the sectional area of the first inner conductor 2d. Less than the sum of Than it is.

  Further, in another example of the embodiment of the electric double layer capacitor C shown in FIG. 5, the electric double layer capacitor case having the above structure is placed on and electrically connected to the upper surface of the second metallized layer 1b. The first electrode B-1 and the second electrode B placed so as to be in close contact with the upper surface of the first electrode B-1 via an insulating sheet B-3 impregnated with the electrolytic solution B-4 -1 is bonded to the upper surface of the ceramic substrate 1 so as to cover the recess 1a, and at least the lower main surface is made conductive, and is connected to the first metallized layer 1d via a conductive resin. And a lid 4 that is in contact with and electrically connected to the second electrode B-2.

The first electrode B-1 and the second electrode B-2 are obtained by, for example, carbonizing activation of phenol resin fibers (novoloid fibers), and the activation is performed in a high temperature atmosphere of 800 to 1000 ° C. It is carried out by bringing it into contact with an activation gas such as high-temperature steam, and gasifies volatile components or part of carbon atoms in the carbide, mainly developing a fine structure of 1 to 10 nm to increase the internal surface area to 1 × 10 ⁶ m ^2. / Kg or more. The electric double layer capacitors B and C of the present invention have no polarity in the first and second conductor layers 1d and 1e, and can be used with the first conductor layer 1d side as an anode and the second conductor layer 1e side as a cathode. However, it can also be used with the opposite polarity.

The electrolytic solution B-4 is, for example, a lithium salt such as lithium hexafluorophosphate (LiPF ₆ ) or a quaternary ammonium salt such as tetraethylammonium tetrafluoroborate ((C ₂ H ₅ ) ₄ NBF ₄ ) using propylene carbonate. It is dissolved in a solvent such as (PC) or sulfolane (SLF).

  Further, for the insulating sheet B-3, for example, a resin having heat resistance such as glass fiber, polyphenylene sulfide, polyethylene terephthalate, and polyamide is used.

  In the electric double layer capacitors B and C, the first electrode B-1, the insulating sheet B-3, the second electrode B-2, and the lid 4 are in close contact with each other on the upper surface of the first metallized layer 1b. After injecting the electrolytic solution B-4, the upper surface of the substrate 1 is applied by a method such as brazing using Al brazing, Ag brazing, Au-Sn solder, or bonding using a resin adhesive or the like. The electric double layer capacitors B and C are joined to cover the recess 1a.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example, the battery case or the electric double layer capacitors B and C using the battery case or the electric double layer capacitor case having one recess 1a have been described. However, the battery case or the electric double layer capacitor having a plurality of recesses 1a is described. In this case, the lid 4 may be a single lid 4 that covers all the recesses 1a, or a plurality of lids 4 that cover the respective recesses 1a may be attached. . When a battery case having a plurality of recesses 1a is used as described above, the batteries B and C produced in the respective recesses 1a can be connected in parallel to obtain high-capacity batteries B and C. By connecting them in series, the batteries B and C that can supply a high voltage can be obtained.

  Further, for example, in the present invention, the material of the ceramic base 1 of the battery case or the electric double layer capacitor case has been described as an alumina sintered body, but it is made of other ceramics such as an aluminum nitride sintered body or glass ceramics. In the case of an aluminum nitride sintered body, heat during operation can be efficiently dissipated to the outside.

(A) is sectional drawing which shows an example of embodiment of the case for batteries of this invention, or the case for electric double layer capacitors, (b) is a top view of (a). (A) is sectional drawing which shows the other example of embodiment of the case for batteries of this invention, or the case for electric double layer capacitors, (b) is a top view of (a). (A) is sectional drawing which shows the other example of embodiment of the case for batteries of this invention, or the case for electric double layer capacitors, (b) is a top view of (a). It is sectional drawing which shows an example of embodiment of the battery or electric double layer capacitor of this invention. It is sectional drawing which shows an example of embodiment of the battery or electric double layer capacitor of this invention. It is sectional drawing which shows the example of the conventional battery or an electrical double layer capacitor.

Explanation of symbols

1: Ceramic substrate 1a: Recess 1b: Second metallized layer 1c: Step 1d: First metallized layer 1e: Second conductor layer 1f: First conductor layer 2b: Second inner conductor 2d: First Inner conductor 4: Lid B-1: Positive electrode plate, first electrode B-2: Negative electrode plate, second electrode B-3: Insulating sheet B-4: Electrolytic solution B: Battery, electric double layer capacitor C: Battery, electric double layer capacitor

Claims (8)

A ceramic base in which a recess is formed in the center of the upper surface and a step is formed between one inner side surface and the bottom surface of the recess, a first metallized layer formed on the upper surface of the step, and a bottom surface of the recess A plurality of second metallized layers formed on the ceramic substrate, a first conductor layer and a second conductor layer provided on the lower surface of the ceramic base, and a plurality of layers from the first metallized layer to the first conductor layer. And a plurality of second inner conductors formed from the second metallized layer to the second conductor layer, and the number of the second inner conductors is the number of the second inner conductors. Is less than the number of the first inner conductors, and the sum of their cross-sectional areas is smaller than the sum of the cross-sectional areas of the first inner conductors. A ceramic base having a recess formed in the center of the upper surface; a first metallization layer formed around the recess on the upper surface of the ceramic base; a second metallization layer formed on the bottom of the recess; A first conductor layer and a second conductor layer provided on a lower surface of the ceramic base; a plurality of first inner conductors formed from the first metallization layer to the first conductor layer; and A plurality of second inner conductors formed from the second metallization layer to the second conductor layer, and the number of the second inner conductors is greater than the number of the first inner conductors. A battery case characterized in that the total cross-sectional area thereof is smaller than the total cross-sectional area of the first inner conductor. The battery case according to claim 1, a positive electrode plate placed on and electrically connected to the upper surface of the second metallization layer, and an insulating sheet impregnated with an electrolyte on the upper surface of the positive electrode plate And a negative electrode plate having one end electrically connected to the first metallized layer and a lid attached to the upper surface of the ceramic base so as to cover the recess. A battery comprising the battery. The battery case according to claim 2, a positive electrode plate placed on and electrically connected to the upper surface of the second metallization layer, and an insulating sheet impregnated with an electrolyte solution on the upper surface of the positive electrode plate A negative electrode plate placed so as to be in close contact with the upper surface of the ceramic substrate so as to cover the concave portion, and at least a lower main surface is made conductive, and the first electrode is interposed through a conductive resin. A battery comprising: a lid body connected to one metallized layer and abutted against and electrically connected to the negative electrode plate. A ceramic base in which a recess is formed in the center of the upper surface and a step is formed between one inner side surface and the bottom surface of the recess, a first metallized layer formed on the upper surface of the step, and a bottom surface of the recess A plurality of second metallized layers formed on the ceramic substrate, a first conductor layer and a second conductor layer provided on the lower surface of the ceramic base, and a plurality of layers from the first metallized layer to the first conductor layer. And a plurality of second inner conductors formed from the second metallized layer to the second conductor layer, and the number of the second inner conductors is the number of the second inner conductors. Is less than the number of the first inner conductors, and the sum of the cross-sectional areas thereof is smaller than the sum of the cross-sectional areas of the first inner conductors. A ceramic base having a recess formed in the center of the upper surface; a first metallization layer formed around the recess on the upper surface of the ceramic base; a second metallization layer formed on the bottom of the recess; A first conductor layer and a second conductor layer provided on a lower surface of the ceramic base; a plurality of first inner conductors formed from the first metallization layer to the first conductor layer; and A plurality of second inner conductors formed from the second metallization layer to the second conductor layer, and the number of the second inner conductors is greater than the number of the first inner conductors. A case for an electric double layer capacitor, characterized in that the sum of the cross-sectional areas thereof is smaller than the sum of the cross-sectional areas of the first inner conductors. The case for an electric double layer capacitor according to claim 5, a first electrode placed on and electrically connected to the upper surface of the second metallized layer, and an upper surface of the first electrode impregnated with an electrolyte A second electrode that is placed in close contact with the insulating sheet and electrically connected to the first metallization layer, and is attached to the upper surface of the ceramic substrate so as to cover the recess. An electric double layer capacitor comprising: a covered lid. The case for an electric double layer capacitor according to claim 6, a first electrode placed on and electrically connected to the upper surface of the second metallized layer, and an electrolyte solution impregnated on the upper surface of the first electrode The second electrode placed so as to be in close contact with the insulating sheet, and joined to the upper surface of the ceramic base so as to cover the concave portion, and at least the lower main surface is made electrically conductive. An electric double layer capacitor comprising: a lid body that is connected to the first metallized layer through a resin and that is in contact with and electrically connected to the second electrode.

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