WO2008041503A1

WO2008041503A1 - Battery storing structure

Info

Publication number: WO2008041503A1
Application number: PCT/JP2007/068344
Authority: WO
Inventors: Kazuhiro Yamada
Original assignee: Murata Manufacturing Co., Ltd.
Priority date: 2006-09-29
Filing date: 2007-09-21
Publication date: 2008-04-10

Abstract

Provided is a battery storing structure which can be surface-mounted on a substrate by making density higher with other electronic components by reflow soldering. The battery storing structure (1) is provided with a battery element (10) including a positive electrode (11), a negative electrode (12) and a solid electrolyte (13). The battery storing structure is also provided with a storing member (20) for storing the battery element (10). The storing member (20) includes an insulating base material (21) having a surface whereupon the battery element (10) is mounted, and a metal cover member (22) bonded to the insulating base material (21) to cover the battery element (10) mounted on the surface of the insulating base material (21). In the internal space of the storing member (20), an insulating material (30) is arranged to surround the battery element (10).

Description

Specification

Battery housing structure

Technical field

TECHNICAL FIELD [0001] The present invention generally relates to a battery housing structure, and more particularly to a battery housing structure that houses a battery including a solid electrolyte.

Background art

In recent years, for example, lithium secondary batteries have been used as power sources for portable electronic devices such as cellular phones and portable personal computers. With the further miniaturization of portable electronic devices, there is a demand for further miniaturization and higher density of batteries!

[0003] In addition, a liquid electrolyte is generally used as an electrolyte of a lithium secondary battery. This liquid electrolyte may leak to the outside and deteriorate the battery performance, or the leaked electrolyte may damage the external electric circuit board.

[0004] Therefore, the battery case power that does not leak out and can be easily connected to an external electric circuit board and can be reduced in size is disclosed, for example, in JP-A-2005-71889 (Patent Document 1). Proposed.

Patent Document 1: JP-A-2005-71889

Disclosure of the invention

Problems to be solved by the invention

[0005] However, since the battery case contains a battery including an electrolytic solution, there is concern about immersion in the electrolytic solution, and it is difficult to accommodate other electronic components other than the battery. For this reason, along with further downsizing of the portable electronic device, it is difficult to accommodate the battery together with other electronic components to increase the density of the battery housing structure.

Meanwhile, in recent years, depending on the application of the lithium secondary battery, it has been required to mount the battery on a substrate together with other electronic components such as a capacitor. Surface mounting of electronic components onto the board is performed by reflow soldering. In reflow soldering, a paste-like solder material is supplied in advance to the location where electronic components are connected on the wiring board, and the electronic components are placed on the solder material and heated. This is the method of attaching. The reflow soldering process is performed in a state where the substrate and the electronic component are placed in a reflow furnace heated to a predetermined temperature. Therefore, there is a demand for a battery housing structure that can withstand the heating temperature in the reflow furnace.

[0007] Recently, in order to cope with environmental problems, it has been required to change the solder material from conventional tin (Sn) -lead (Pb) eutectic solder to Pb-free solder containing no Pb. The The melting temperature of Pb-free solder is higher than that of Sn—Pb solder. When using Pb-free solder, it is required to increase the heating temperature in the reflow furnace as the melting temperature of the solder material increases. In this case, the battery housing structure is required to have a higher heat-resistant temperature.

[0008] Therefore, an object of the present invention is to provide a battery housing structure that can be densified together with other electronic components and can be surface-mounted on a substrate by reflow soldering.

Means for solving the problem

[0009] In order to solve the above-mentioned problems, the present inventor has made various studies. As a result, when a battery including a solid electrolyte is used, the battery can be accommodated together with other electronic components, and by reflow soldering. It has been found that a battery housing structure that can be surface-mounted on a substrate can be obtained. The present invention has been made based on this finding.

A battery housing structure according to the present invention includes a battery body including a positive electrode, a negative electrode, and a solid electrolyte, and a housing member that houses the battery body. The housing member includes an insulating base material having a surface on which the battery body is placed, and a lid member joined to the insulating base material so as to cover the battery body placed on the surface of the insulating base material. Including. An insulating material is disposed in the inner space of the housing member so as to surround the battery body.

[0011] In the battery housing structure of the present invention, the housing member houses the battery element body including the solid electrolyte, and an insulating material is disposed in the inner space of the housing member so as to surround the battery body body! Therefore, the force S for accommodating other electronic components inside the accommodating member in a state of being insulated and separated from the battery element body can be achieved. For this reason, the power S is required to accommodate the batteries together with other electronic components to increase the density.

[0012] Further, in the battery housing structure of the present invention, the housing member is a solid that is not a liquid electrolyte. Since the battery body containing the electrolyte is housed, it is possible to withstand the heating temperature in the reflow furnace. Thus, the battery housing structure of the present invention can be surface-mounted on the substrate by reflow soldering.

[0013] By the way, since the battery body in the present invention is composed of only a solid, the volume changes during charging and discharging. At this time, the contact state between the electrode active material particles and between the electrode active material particles and the electrolyte material particles changes as the battery body volume changes repeatedly during charging and discharging. Therefore, there is a problem that the voltage of the battery becomes unstable. In the battery housing structure of the present invention, since the insulating material is disposed so as to surround the battery body in the internal space of the housing member, the above problem can be solved. Therefore, the battery housing structure of the present invention can improve the voltage stability during charging and discharging of the battery. If the insulating material is made of a soft resin and the outer housing member is made of a hard material, deformation of the insulating material surrounding the battery element body can be suppressed, so that the above effect can be further enhanced. Can do.

[0014] In the battery housing structure of the present invention, the housing member further houses an electronic component, the electronic component is placed on the surface of the insulating base material, and the lid member is placed on the surface of the insulating base material. It is bonded to the insulating base material so as to cover the electronic component, and an insulating material is disposed so as to surround the electronic component in the internal space of the housing member!

With this configuration, the electronic component can be housed inside the housing member in a state of being more effectively insulated and separated from the battery body.

[0016] Furthermore, in the battery housing structure of the present invention, the insulating base material may be configured to have a recessed portion that houses the battery body, or the lid member has a recessed portion that houses the battery body. Configure it to do it.

[0017] In the battery housing structure of the present invention, the conductor portion is disposed inside the insulating base material, the terminal is disposed on the outer surface on one side of the insulating base material, and the positive electrode of the battery body The negative electrode is preferably connected to the terminal through the conductor.

With this configuration, since the terminal is disposed on the outer surface on one side of the insulating base material, a paste-like solder material is supplied in advance to a location on the wiring board connected to the terminal. Can perform the reflow soldering process. [0019] In this case, the lid member is made of metal, and a metallized layer is formed on the surface of the insulating base material joined to the lid member. The insulating base material and the lid member are interposed with the metallized layer interposed therebetween. The lid is electrically connected to the conductor portion by connecting the conductor portion and the metallized layer, which are joined and disposed inside the insulating base material, and is connected to one of the positive electrode and the negative electrode of the battery body. It is preferable that the lid member is configured as a conductive path by electrically connecting the lid member.

[0020] With this configuration, a predetermined voltage is applied between the outer surface of the lid member made of metal and the terminals disposed on the outer surface of the insulating base material using a seam welding method. Thus, the lid member and the insulating base material can be efficiently joined by welding.

The invention's effect

As described above, according to the present invention, a battery can be housed together with other electronic components to increase the density of the battery housing structure, and the battery housing structure can be formed into a substrate by reflow soldering. Enables surface mounting.

Brief Description of Drawings

FIG. 1 is a schematic cross-sectional view showing a configuration of a battery housing structure as one embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing the configuration of a battery housing structure as another embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view showing a configuration of a battery housing structure as still another embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view showing a configuration of a battery housing structure as still another embodiment of the present invention.

FIG. 5 is a diagram showing a change in voltage when charging a battery in a state where it is housed in a battery housing structure.

FIG. 6 is a diagram showing a change in voltage when charging a battery in a battery housing structure!

Explanation of symbols

[0023] 1, 2, 3, 4: Battery housing structure, 10: Battery body, 11: Positive electrode, 12: Negative electrode, 13: Solid electrolysis 20: Housing member, 21: Insulating base material, 22: Metal lid member, 30: Insulating material, 40: Electronic component, 11 2, 113, 122, 124, 411, 421: Conductor part, 110, 120, 410 , 420: Terminal.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing the configuration of a battery housing structure as one embodiment of the present invention.

As shown in FIG. 1, the battery housing structure 1 includes a battery body 10 and a housing member 20 that houses the battery body 10.

[0027] As the battery element 10, for example, an all-solid secondary battery includes a solid electrolyte 13 sandwiched between a positive electrode 11 and a negative electrode 12, and a conductive adhesive 111 is attached to the outer surface of the positive electrode 11. A conductive adhesive 121 is attached to the outer surface of the negative electrode 12. The positive electrode 11 comprises Li FeS or LiCoO as a positive electrode active material and a Li S—PS system composition as a solid electrolyte.

2 2 2 2 2 5

Including. Negative electrode 12 consists of graphite as the negative electrode active material and Li S -P S as the solid electrolyte.

2 2 system composition. The solid electrolyte 13 sandwiched between the positive electrode 11 and the negative electrode 12 is Li S -P

5 2 2

S-based composition. Conductive adhesives 111 and 121 are, for example, silver (Ag) -epoxy

Five

It is a conductive adhesive.

The housing member 20 includes an insulating base material 21 and a metal lid member 22. The insulating base material 21 has a recess for accommodating the battery body 10. On the bottom surface of the recess as the surface of the insulating base material 21, the battery body 10 is mounted and fixed with a conductive adhesive 111 interposed therebetween. The metal lid member 22 is bonded to the top surface of the concave portion of the insulating base material 21 via a metallized layer (not shown) so as to cover the battery body 10 mounted on the surface of the insulating base material 21. ing. The metallized layer is formed, for example, by printing and applying a metal paste whose main component is a metal powder such as tungsten (W) and baking it. The insulating base material 21 is made of ceramic status such as alumina, for example. The metal lid member 22 is made of a metal such as aluminum (A1) or copper (Cu) or an alloy such as iron (Fe) -nickel (Ni) -cobalt (Co) alloy. The metal lid member 22 and the negative electrode 12 of the battery body 10 are connected by a conductive adhesive 121 that is interposed between the inner surface of the metal lid member 22 and the outer surface of the negative electrode 12. Thus, since the battery body 10 is firmly fixed to the insulating base material 21, the battery body during charging / discharging Degradation of characteristics due to a volume change of 10 can be suppressed.

[0029] Note that the conductive adhesive 121 and the metal lid member adhered to the outer surface of the negative electrode 12 of the battery body 10 with a metal wire or the like interposed between the metal lid member 22 and the outer surface of the negative electrode 12 The inner surface of 22 may be electrically connected. Further, in this embodiment, the insulating base material 21 may be formed of an insulating material such as a synthetic resin that can withstand the heating temperature in the force reflow furnace shown in the example formed of ceramics. . In this case, it is preferable to form the insulating base material 21 using a synthetic resin having a heat distortion temperature of 270 ° C. or higher.

An insulating material 30 is arranged and filled in the internal space of the housing member 20 so as to surround the battery body 10. The insulating material 30 is made of a material such as an epoxy resin or a polyimide resin, for example.

[0031] Conductor portions 112 and 122 are arranged inside the insulating base material 21. The conductor portions 112 and 122 are formed as follows. First, for example, a metal paste mainly composed of a metal powder such as tungsten (W) is printed on the surface of the green sheet on the ceramic green sheet constituting the insulating base 21 or formed on the green sheet. The printed holes are printed and filled to form a printed pattern serving as a conductor portion. Next, the green sheets on which these printed patterns are formed are stacked and fired to produce the insulating base material 21 having the conductor portions 112 and 122 inside.

[0032] Terminals 110 and 120 are arranged on the lower surface as the outer surface on one side of the insulating base 21. The positive electrode 11 of the battery body 10 is connected to the terminal 110 through the conductive adhesive 111 and the conductor portion 112. The negative electrode 12 of the battery body 10 is connected to the terminal 120 through the conductive adhesive 121, the metal lid member 22, and the conductor portion 122. The terminals 110 and 120 are formed as follows. First, a metal paste mainly composed of metal powder such as tandasten (W) is printed on a ceramic green sheet constituting the insulating base 21 to form a printed pattern serving as a terminal. Next, the insulating sheet 21 having the terminals 110 and 120 on the outer surface is produced by firing the green sheet on which these printed patterns are formed. The terminals 110 and 120 are formed in the same process as the conductor portions 112 and 122 described above. In order to improve the wettability with solder, it is preferable that a nickel (Ni) layer and a gold (Au) layer are formed on the surfaces of the terminals 110 and 120 by a plating method or the like. [0033] In the battery housing structure 1 as one embodiment of the present invention configured as described above, the housing member 20 houses the battery body 10 including the solid electrolyte 13, and the housing member 20 Since the insulating material 30 is disposed in the internal space so as to surround the battery body 10, other electronic components other than the battery body 10 are accommodated in the insulating material 20 in a state of being insulated from the battery body 10. Can be housed inside. For this reason, a battery can be accommodated together with other electronic components to increase the density or to be integrated.

[0034] Further, in the battery housing structure 1 of the present invention, the housing member 20 houses the battery body 10 including the solid electrolyte 13 that is not a liquid electrolyte, and therefore is resistant to the heating temperature in the reflow furnace. Is possible. Thereby, the battery housing structure 1 of the present invention can be surface-mounted on the substrate by reflow soldering.

By the way, when the battery body 10 is charged and discharged, the lithium ions enter and exit, whereby the crystal structure of the electrode active material changes and the volume changes. Since the battery body 10 in the present invention does not contain a liquid component and is composed only of a solid, the volume change of the particles of the electrode active material cannot be absorbed, and the volumes of the positive electrode 11 and the negative electrode 12 change during charging and discharging. To do. At this time, as the volume change of the battery body is repeated at the time of charging / discharging, the contact state of the electrode active material particles and the electrode active material particles and the electrolyte material particles changes. There is a problem that the voltage becomes unstable. In the battery housing structure 1 of the present invention, since the insulating material 30 is disposed in the internal space of the housing member 20 so as to surround the battery body 10, the above problem can be solved. Therefore, the battery housing structure 1 of the present invention can achieve voltage stability during charging / discharging of the battery body 10. If the insulating material 30 is made of a soft resin and the outer housing member 20 is made of a hard material, deformation of the insulating material 30 surrounding the battery body 10 can be suppressed. The effect can be further enhanced.

[0036] Furthermore, in the battery housing structure 1 of the present invention, the positive electrode active material constituting the battery body 10 includes LiFeS, the negative electrode active material includes carbon, and the solid electrolyte includes LiS and PS.

2 2 2 2 5 In this case, in the battery body 10, the solid electrolyte contains Li S and P S and is positive.

2 2 5

When the active material contains Li FeS, the positive electrode active material made of sulfide is reactive with the solid electrolyte.

twenty two

Is low. Even if the battery body 10 is heat-treated at a predetermined temperature, the capacity of the battery The rate at which characteristics such as quantity are reduced is lower than that of a conventional solid battery including a solid electrolyte. As a result, the battery body 10 of the present invention can have higher heat resistance than the conventional solid battery, so that the soldering process is performed in a reflow furnace having a relatively high heating temperature using Pb-free solder. Even if it is performed, deterioration of characteristics such as battery capacity can be kept low.

In the battery housing structure 10 of the present invention, the conductor portions 112 and 122 are disposed inside the insulating base material 30, and the terminals 110 and 120 are disposed on the lower surface of the insulating base material 21. The positive electrode 11 and the negative electrode 12 of the element body 10 are connected to terminals 110 and 120 through conductor portions 112 and 122, respectively.

[0038] Since it is configured in this way, the terminals 110 and 120 are arranged on the lower surface, which is the outer surface on one side of the insulating base material 21, so that the terminals 110 and 120 are placed on the wiring board connected to the terminals 110 and 120. A reflow soldering process can be performed by supplying a paste-like solder material in advance.

[0039] In this case, a metallized layer is formed on the top surface of the concave portion of the insulating base material 21 joined to the metal lid member 22, and the insulating base material 21 and the metal lid member 22 are interposed with the metallized layer interposed therebetween. The metal lid member 22 is electrically connected to the conductor portion 122 by joining the conductor portion 122 and the metallized layer disposed inside the insulating base material 21 and the negative electrode of the battery body 10 When the metal lid member 22 is electrically connected to the 1 2 through the conductive adhesive 121, the metal lid member 22 is configured as a conductive path!

With such a configuration, a predetermined voltage is applied between the outer surface of the metal lid member 22 and the terminal 120 disposed on the outer surface of the insulating base material 21 using a seam welding method. As a result, the metal lid member 22 and the insulating base material 21 can be efficiently joined by welding, and at the same time, a highly airtight joint can be realized. As a result, for example, deterioration of the battery body 10 due to moisture absorption can be prevented.

As shown in FIG. 2, in the battery housing structure 2, the housing member 20 includes, in addition to the battery body 10, SRAM (static “random access” memory), real-time “clock”, and battery charging / discharging. It further includes devices such as electric control elements and other electronic components 40. The electronic component 40 is placed on the bottom surface of the concave portion of the insulating base material 21. The metal lid member 22 is bonded to the top surface of the concave portion of the insulating base material 21 so as to cover the electronic component 40 placed on the surface of the insulating base material 21 together with the battery body 10. An insulating material 30 is disposed and filled in the internal space of the housing member 20 so as to surround the electronic component 40. The insulating material 30 is made of a material such as epoxy resin or polyimide resin. Other configurations of the battery housing structure 2 shown in FIG. 2 are the same as those of the battery housing structure 1 shown in FIG.

[0043] A real-time clock as the electronic component 40 is a clock built in a personal computer, a mobile phone or the like, and keeps ticking the actual time (real time). Like SRA M, it is necessary to supply power to the real-time clock. When replacing the main battery as a power supply source, or if the AC power supply is turned off if it is normally driven by an AC (alternating current) power source, power is supplied to the clock or SRAM from another power source. Need to supply. Therefore, when a real-time clock or SRAM is installed in an electronic device, it is necessary to install a backup power supply (battery). In another embodiment of the present invention, the housing member 20 includes, for example, a battery body 10 as a backup power source, together with a real-time 'clock or SRA M as an electronic component 40, so that a real-time' clock or SRAM and Eliminates the need to place a knock-up power supply in a separate package or to electrically connect a backup power supply to a real-time clock or SRAM.

In the battery housing structure 2 shown in FIG. 2, four terminals 110, 120, 410, and 420 are self-placed on the lower surface that is the outer surface on one side of the insulating base material 21. The positive electrode 11 of the battery body 10 is connected to the terminal 110 through the conductive adhesive 111 and the conductor portion 112. The negative electrode 12 of the battery body 10 is connected to the terminal 120 through the conductive adhesive 121, the metal lid member 22, and the conductor portion 122. The positive electrode 11 of the battery body 10 and the electronic component 40 are electrically connected by a conductor portion 113. The negative electrode 12 of the battery body 10 and the electronic component 40 are electrically connected through the metal lid member 22 and the conductor portion 124. The electronic component 40 is connected to the terminals 410 and 420 through the conductor portions 411 and 421. Note that the conductors and the terminals in the battery housing structure 2 shown in FIG. 2 are formed in the same process as the battery housing structure 1 shown in FIG. In the battery housing structure 2 as another embodiment of the present invention configured as described above, the housing member 20 further houses the electronic component 40, and the electronic component 40 is the insulating substrate 21. The metal lid member 22 is mounted on the bottom surface of the recess, and is joined to the insulating base material 21 so as to cover the electronic component 40 mounted on the bottom surface of the recess of the insulating base material 21. An insulating material 30 is disposed in the partial space so as to surround the electronic component 40.

With this configuration, the electronic component 40 can be housed inside the housing member 20 in a state of being more effectively insulated and separated from the battery body 10.

It should be noted that other functions and effects obtained by the battery housing structure 2 are the same as those of the battery housing structure 1.

In the battery housing structure 3 shown in FIG. 3, the metal lid member 24 has a recess for housing the battery body 10, and the insulating base material 23 has a flat plate shape. In this respect, the battery housing structure 3 shown in FIG. 3 is different from the battery housing structure 1 shown in FIG. 1, and the other configurations are the same as those of the battery housing structure 1.

In the battery housing structure 4 shown in FIG. 4, the metal lid member 24 has a recess for housing the battery body 10, and the insulating base material 23 has a flat plate shape. In this respect, the battery housing structure 4 shown in FIG. 4 is different from the battery housing structure 2 shown in FIG. 2, and other configurations are the same as the battery housing structure 2.

In any of the above embodiments, the positive electrode 11 is disposed on the lower side and the negative electrode 12 is disposed on the upper side, but the positive electrode may be disposed on the upper side and the negative electrode may be disposed on the lower side. In any of the above embodiments, the battery body 10 accommodated in the battery housing structure has been described as an example of an all-solid secondary battery, but may be a primary battery. In any of the above embodiments, the inner space of the housing member 20 is filled with the insulating material 30 such as epoxy resin or polyimide resin. It is difficult to completely fill the inner space with the insulating material 30. There may be some gaps. In this case, argon (Ar) gas, nitrogen gas, etc. Filled with sex gas!

Example

Hereinafter, examples of the present invention will be described.

[Example 1]

Using the Li S -P S composition as the solid electrolyte, the entire battery element 10 shown in Fig. 1 is used.

2 2 5

A solid secondary battery was produced.

[0055] The solid electrolyte is a stone in which Li S and P S are mixed at a molar ratio of 7: 3 and the inner surface is coated with carbon.

2 2 5

The above mixture was sealed in a vacuum tube, heated at 900 ° C for 2 hours, and then rapidly cooled with ice water. Li FeS as a positive electrode active material is a mixture of Li S and FeS in a monolith ratio of 1: 1.

2 2 2

In addition, the above mixture was vacuum sealed in a quartz tube whose inner surface was coated with carbon, and heated at 950 ° C. for 5 hours.

[0056] A positive electrode material was prepared by mixing the positive electrode active material obtained above and a solid electrolyte in a weight ratio of 1: 1. A part of the obtained positive electrode material was heat-treated at 270 ° C. for 5 minutes in a vacuum sealed quartz tube. In this way, a positive electrode material A that was not heat-treated and a positive electrode material B that was heat-treated were prepared.

[0057] A negative electrode material was produced by mixing the solid electrolyte obtained above and graphite powder at a weight ratio of 1: 1. As the graphite powder, a commercial product made by TIMCAL and SFG6 having a specific area of 17 m ² / g was used.

[0058] Each of the positive electrode material A and the positive electrode material B obtained as described above, a solid electrolyte, and a negative electrode material are sequentially laminated, and two pellets having a three-layer structure are press-molded at a pressure of 3000 kgf / cm ^2. It was produced by. In this way, as shown in FIG. 1, a battery body 10 including a solid electrolyte 13 sandwiched between a positive electrode 11 and a negative electrode 12 was obtained.

[0059] On the other hand, as a ceramic green sheet constituting the insulating substrate 21 shown in FIG. 1, a metal paste containing tungsten (W) metal powder as a main component is printed and applied to an aluminum compact as a conductor portion. A printed pattern to be terminals was formed. Next, an insulating base material 21 having conductor portions 112 and 122 inside and terminals 110 and 120 on the outer surface was produced by laminating and firing the green sheets on which these printed patterns were formed. At this time, a metallized layer was formed on the top surface of the recess of the insulating base material 21. To improve the wettability with solder, A nickel (Ni) layer and a gold (Au) layer were formed on the surfaces of the terminals 110 and 120 by a plating method.

[0060] Using the battery body 10 and the insulating base material 21 obtained above, the bottom surface of the recess of the insulating base material 21 with the positive electrode 11 side of the battery body 10 facing down as shown in FIG. On top of this, the battery body 10 was placed with the silver (Ag) -epoxy conductive adhesive interposed as the conductive adhesive 111, and the adhesive was cured. As a result, the battery body 10 was joined to the insulating base material 21 so as to conduct between the conductor portion 112 and the positive electrode 11.

Thereafter, an epoxy resin as an insulating material 30 was arranged so as to surround and cover the periphery of the battery body 10 so that a part of the surface of the negative electrode 12 of the battery body 10 was exposed. Then, a part of the surface of the exposed negative electrode 12 was completely covered with a conductive adhesive 121 made of silver (Ag) -epoxy conductive adhesive.

Next, a metal lid member 22 was disposed on the top surface of the concave portion of the insulating base material 21 with a metallized layer interposed so as to cover the battery body 10 mounted on the surface of the insulating base material 21. Further, by applying a predetermined voltage between the outer surface of the metal lid member 22 and the terminal 120 disposed on the outer surface of the insulating base material 21 using a seam welding method, The insulating base material 21 was joined by welding. Thereafter, the conductive adhesive 121 and the epoxy resin as the insulating material 30 are cured so that the metal lid member 22 and the negative electrode 12 can be conducted through the conductive adhesive 121 and the metal lid. The member 22, the insulating material 30, and the insulating base material 21 were integrated. In this way, a small battery housing structure 1 having a size of 4 mm × 4 mm square was produced.

[0063] In this way, as Example 1 of the present invention, the battery housing structure 1 that houses the battery A (using the positive electrode material A) and the battery B (using the positive electrode material B) are housed. A battery housing structure 1 was prepared.

[0064] (Example 2)

An all-solid secondary battery using LiCoO as the positive electrode active material was fabricated. As a positive electrode active material

2

LiCoO is a mixture of Li CO and Co O in a molar ratio of 3: 2 and the above mixture in air.

2 2 3 3 4

Was prepared by heating at 900 ° C. for 10 hours. A positive electrode material was prepared by mixing the positive electrode active material and the solid electrolyte obtained in the above-described example at a weight ratio of 1: 1. Part of the obtained positive electrode material was heat-treated at 270 ° C for 5 minutes in a vacuum-sealed quartz tube. Thus, the positive electrode material C which was not heat-treated and the positive electrode material which was heat-treated Prepared D and D.

[0065] In the same manner as in Example 1 above, Example 2 of the present invention uses a battery housing structure 1 containing a battery C (using positive electrode material C) and a battery D (using positive electrode material D). A battery housing structure 1 was housed.

[0066] The batteries A, B, C, D housed in each of the produced battery housing structures 1 were charged at a current density of 16 μA / cm ² , discharged, and unit weight of the positive electrode active material The discharge capacity per unit was measured. Charging / discharging was performed according to the following procedure. After starting charging at the above current density, when the potential changed rapidly, it was considered that charging was complete and charging was stopped. After that, it was switched to discharge, and when the potential reached 0V, the discharge was considered complete and the discharge was stopped. This charge / discharge test was performed at an ambient temperature of 20 ° C.

[0067] As a result, battery A (using a positive electrode material that was not heat-treated at 270 ° C), which is Example 1 of the present invention, showed a discharge capacity of 120 mAh / g, and battery B (270 ° C (Using a positive electrode material that had been heat-treated) showed a discharge capacity of 98 mAh / g. On the other hand, battery C (a power that is not subjected to heat treatment at 270 ° C., using a positive electrode material), which is Example 2 of the present invention, shows a discharge capacity of 118 mAh / g, and battery D (270 ° C. A positive electrode material that had been heat treated with C) showed a discharge capacity of 30 mAh / g.

[0068] In the battery housing structures 1 of Example 1 and Example 2, the battery body 10 shows battery performance in a state where it is insulated by the insulating material 30, and other electronic components are housed in the housing member 20. It was confirmed that it was possible to mount the battery housing structure on the board by reflow soldering.

[0069] Further, from the above results, the battery body 10 of Example 1 was subjected to a soldering process in a state where it was placed in a reflow furnace at 270 ° C, that is, lead-free solder was used. Even when the soldering process is performed in a reflow furnace with a relatively high heating temperature of 270 ° C or less, the deterioration of the discharge capacity of the battery can be kept low compared to the battery body 10 of Example 2. can this and the force ^s Wakakaru.

[0070] (Example 3)

A battery housing structure 2 shown in FIG. 2 was produced. Before mounting the battery body 10 on the bottom surface of the recess of the insulating base material 21, an SRAM chip was mounted as the electronic component 40. Other manufacturers The same process as in Example 1 was performed.

In the obtained battery housing structure 2, the battery body 10 and the electronic component 40 exhibit battery performance and memory performance in a state where they are insulated by the insulating material 30, and a backup battery is used. It was confirmed that the SRAM data could be backed up and the stored data was not lost. Therefore, it was confirmed that the electronic component 40 can be housed inside the housing member 20 while being insulated and separated from the battery body 10.

[Example 4]

In the same manner as in Example 1, a Li—PS based composition is used as a solid electrolyte and shown in FIG.

2 2 5

As the battery body 10, an all-solid secondary battery was produced. A battery A (using positive electrode material A) in the battery housing structure 1 manufactured in Example 1 and a battery A in a state not housed in the battery housing structure 1 16 A The battery was charged at a current density of / cm ² . The change in voltage during charging was measured. Fig. 5 shows the change in voltage during charging of battery A in the battery housing structure 1, and Fig. 6 shows battery A in the battery housing structure 1! /, NA! / It is a figure which shows the change of the voltage at the time of charge.

[0073] As shown in FIG. 5, in the battery A in the state of being accommodated in the battery housing structure 1, the power at which an almost stable voltage change is observed during the charging process, as shown in FIG. It can be seen that the battery A in the state of “1”, which is housed in 1, has a discontinuous voltage fluctuation especially in the second half of the charging process. This is because, in the battery A that is not accommodated in the battery housing structure 1, the crystal structure of the electrode active material changes due to the entry and exit of lithium ions during charging, and the volume of the battery body during charging It is considered that the voltage of the battery becomes unstable due to the change of. During charging, the volume of the battery body changes as the positive electrode contracts and the negative electrode expands. In the battery A accommodated in the battery housing structure 1, the insulating material 30 is disposed in the inner space of the housing member 20 so as to surround the battery body 10, thereby eliminating the above problem. It can be considered that the voltage changes stably during charging!

It should be considered that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is shown not by the above embodiments and examples but by the scope of claims, and all the meanings within the scope and scope of claims are within the scope of the claims. It is intended to include modifications and variations of

Industrial applicability

According to the present invention, it can be applied to a battery housing structure that houses a battery equipped with a solid electrolyte, and a battery equipped with a solid electrolyte together with other electronic components is housed to increase the density of the battery housing structure. In addition, the battery housing structure can be surface-mounted on the substrate by reflow soldering.

Claims

The scope of the claims

[1] a battery body including a positive electrode, a negative electrode, and a solid electrolyte;

A housing member for housing the battery body;

The housing member is

An insulating substrate having a surface on which the battery body is placed;

A lid member joined to the insulating base material so as to cover the battery body placed on the surface of the insulating base material,

A battery housing structure in which an insulating material is disposed in an inner space of the housing member so as to surround the battery body.

[2] The housing member further houses an electronic component, the electronic component is placed on the surface of the insulating base, and the lid member is the electronic component placed on the surface of the insulating base. The battery housing structure according to claim 1, wherein the battery housing structure is joined to the insulating base material so as to cover, and an insulating material is disposed in an inner space of the housing member so as to surround the electronic component.

[3] The battery housing structure according to claim 1 or 2, wherein the insulating base has a recess for housing the battery body.

[4] The battery housing structure according to any one of claims 1 to 3, wherein the lid member has a recess for housing the battery body.

[5] A conductor portion is disposed inside the insulating base material, a terminal is disposed on an outer surface on one side of the insulating base material, and a positive electrode and a negative electrode of the battery body are passed through the conductor portion. The battery housing structure according to any one of claims 1 to 4, wherein the battery housing structure is connected to the terminal.

[6] The lid member is made of metal, and a metallization layer is formed on a surface of the insulating base material joined to the lid member. The insulating base material and the lid member are interposed through the metallized layer. The lid member is electrically connected to the conductor portion by connecting the conductor portion and the metallized layer disposed inside and joined to each other, and the battery element. 6. The battery housing according to claim 5, wherein the lid member is configured as a conductive path by electrically connecting the lid member to one of a positive electrode and a negative electrode of the body.

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