WO2024070787A1

WO2024070787A1 - Battery package and battery module

Info

Publication number: WO2024070787A1
Application number: PCT/JP2023/033825
Authority: WO
Inventors: 孝太郎中本
Original assignee: 京セラ株式会社
Priority date: 2022-09-26
Filing date: 2023-09-19
Publication date: 2024-04-04

Abstract

An electronic module according to this disclosure that achieves a battery module that is less likely to discharge externally includes: an insulating substrate that includes a first surface, a second surface located opposite the first surface, and a recess that is open on the first surface; a first electrode located on the bottom surface of the recess; an electrically conductive elastic member located on the first electrode; and a conductive member that abuts an upper surface electrode of a battery contained in the recess, wherein the insulating substrate includes a fixing part that restricts the conductive member from moving away from the bottom surface of the recess.

Description

Battery package and battery module

This disclosure relates to battery packages and battery modules.

Various types of power supplies that can be surface-mounted on a printed circuit board together with electronic circuit components have been proposed as power supplies or auxiliary power supplies for small electronic devices.

Patent Document 1 discloses an electrochemical cell in which an electrochemical element is housed within the storage space of a sealed container. The sealed container has a base member on which a first current collector is formed, and a lid member fixed to the base member and on which a second current collector is formed, with a storage space being defined between the two members. The electrochemical element has a first electrode (lower electrode) and a second electrode (upper electrode). An elastic member is disposed between the lid member and the second electrode in the storage space, which presses the second electrode against the first electrode and provides electrical conductivity between the second electrode and the second current collector.

Japanese Patent Publication "JP 2012-69508 A"

A battery package according to one embodiment of the present disclosure includes an insulating substrate having a first surface, a second surface opposite to the first surface, and a recess opening into the first surface, a first external electrode located on the second surface, a second external electrode located on the second surface, a first electrode located on the bottom surface of the recess and electrically connected to the first external electrode, a second electrode located on the insulating substrate and electrically connected to the second external electrode, a conductive elastic member located on the first electrode, and a conductive member that abuts against an upper electrode of a battery housed in the recess and electrically connects the upper electrode and the second electrode, and the insulating substrate includes a fixing portion that restricts movement of the conductive member away from the bottom surface of the recess.

A battery module according to one embodiment of the present disclosure includes a battery package according to one embodiment of the present disclosure and a battery housed in a recess of the battery package.

FIG. 1 is a perspective view showing an external appearance of an example of a battery module according to a first embodiment. FIG. 2 is an exploded perspective view of the battery module of FIG. 1 . 2 is a plan view showing an example of the battery module of FIG. 1 with a lid removed. FIG. FIG. 4 is a cross-sectional view taken along line IV in FIG. 3 . FIG. 2 is a bottom view showing an example of the battery module of FIG. 1 . 2 is a bottom view of the battery module of FIG. 1 showing a seal pattern formed on a second surface of the insulating substrate. FIG. FIG. 4 is a cross-sectional view showing an example of an elastic member. FIG. 4 is a perspective view showing an example of an elastic member. FIG. 4 is a perspective view showing an example of an elastic member. FIG. 4 is a cross-sectional view showing an example of an elastic member. FIG. 2 is a cross-sectional view of the battery module of FIG. 1 showing a state in which a metal frame is provided. 13 is a plan view showing another state of the locking portion of the insulating substrate. FIG. 13 is a plan view showing another state of the locking portion of the insulating substrate. FIG. 14 is a cross-sectional view taken along line XIV in FIG. 13 . 2 is a cross-sectional view showing a state in which the battery module of FIG. 1 having an inclined surface in the locking portion is assembled. FIG. 2 is a cross-sectional view showing how the battery module of FIG. 1 having a stepped surface in the locking portion is assembled. FIG. 2 is a plan view showing a state in which the battery module of FIG. 1 in which the notches are open to the first surface and the recess on the sides of the locking portion is assembled. FIG. 18 is a cross-sectional view taken along lines XVIII-A and XVIII-B in FIG. 17. 13 is a cross-sectional view showing another example of engagement between a fixed portion and a locking portion. FIG. 18 is a cross-sectional view taken along lines XX-A and XX-B in FIG. 17. FIG. 2 is a partially enlarged cross-sectional view of a battery module using a thin-film all-solid-state battery as the battery. FIG. 2 is a partially enlarged cross-sectional view of a battery module using a plurality of thin-film all-solid-state batteries as batteries. FIG. 4 is a plan view showing another example of the battery module according to the first embodiment with the lid removed. 24 is a cross-sectional view taken along line XXIV in FIG. 23 . FIG. 4 is a plan view showing another example of the battery module according to the first embodiment with the lid removed. FIG. 4 is a cross-sectional view showing another example of the battery module according to the first embodiment. FIG. 4 is a cross-sectional view showing another example of the battery module according to the first embodiment. FIG. 11 is a plan view showing an example of a battery module according to a second embodiment with a lid removed. 29 is a cross-sectional view taken along line XXIX in FIG. 28 . 29 is a cross-sectional view taken along line XXX in FIG. 28 . 11 is a cross-sectional view of a battery module according to embodiment 2, showing another state of the connection portion of the conductive member. FIG. 11 is a cross-sectional view of a battery module according to embodiment 2, showing another state of the connection portion of the conductive member. FIG. 11 is a cross-sectional view of a battery module according to embodiment 2, showing another state of the connection portion of the conductive member. FIG. 10 is a cross-sectional view of the battery module according to the second embodiment, showing another state of the fixed portion of the conductive member. FIG. 10 is a cross-sectional view of the battery module according to the second embodiment, showing another state of the fixed portion of the conductive member. FIG. 10 is a cross-sectional view of the battery module according to the second embodiment, showing another state of the fixed portion of the conductive member. FIG. 13 is a plan view showing a state in which a battery module according to a second embodiment in which a cutout opens to a first surface and a recess on a side of a locking portion is assembled. FIG. 38 is a cross-sectional view taken along line XXXVIII in FIG. 37 . 38 is a cross-sectional view taken along line XXXIX in FIG. 37 . FIG. 11 is a plan view showing another example of a battery module according to embodiment 2 with the lid removed. 41 is a cross-sectional view taken along line XLI in FIG. 40 . 41 is a cross-sectional view taken along line XLII in FIG. 40 . FIG. 11 is a plan view showing another example of a battery module according to embodiment 2 with the lid removed. 44 is a cross-sectional view taken along line XLIV in FIG. 43 . FIG. 11 is a cross-sectional view showing another example of a battery module according to embodiment 2. FIG. 11 is a plan view showing another example of a battery module according to embodiment 2 with the lid removed. 47 is a cross-sectional view taken along line XLVII in FIG. 46 . 47 is a cross-sectional view taken along line XLVIII in FIG. 46 . FIG. 11 is a plan view showing an example of a battery module according to a third embodiment with a lid removed. 50 is a cross-sectional view taken along line L in FIG. 49 . FIG. 11 is a cross-sectional view of a battery module according to embodiment 3 having a metal frame.

In the electrochemical cell disclosed in Patent Document 1, the top electrode of the electrochemical element is electrically connected to the lid member by an elastic member between the lid member and the second electrode, resulting in electrical conduction to the outside at the lid member.

According to one aspect of the present disclosure, it is possible to realize a battery module that is less susceptible to external discharge from components other than the external electrodes.

The battery package and battery module according to the embodiment of the present disclosure will be described with reference to the attached drawings. In the following description, the lid side of the battery package and the first surface side of the insulating substrate may be referred to as the upper side, and the insulating substrate side of the battery package and the second surface side of the insulating substrate may be referred to as the lower side. The top-bottom direction may also be referred to as the height direction (thickness direction). This distinction between top and bottom is for convenience, and does not limit the top and bottom when the battery module, etc. is actually used.

[Embodiment 1]
An embodiment of the present disclosure will be described in detail below with reference to Figures 1 to 26. Battery modules 500A, 500A1 to 500A9 described in embodiment 1 are an example of a battery module 500 according to the present disclosure. Also, battery packages 100A, 100A1 to 100A9 described in embodiment 1 are an example of a battery package 100 according to the present disclosure.

FIG. 1 is a perspective view showing the appearance of an example of a battery module 500A according to embodiment 1. FIG. 2 is an exploded perspective view of the battery module of FIG. 1. FIG. 3 is a plan view showing an example of the battery module of FIG. 1 with the lid removed. FIG. 4 is a cross-sectional view taken along line IV in FIG. 3. FIG. 5 is a bottom view showing an example of the battery module of FIG. 1. In the perspective view, each plan view, and bottom view, some of the first electrodes, etc. are shaded in a dot pattern to make them easier to distinguish from others.

As shown in Figures 1 to 5, the battery module 500A includes a battery package 100A and one or more batteries 200 housed in the recess 113 of the battery package 100A.

As shown in Figures 1 to 5, the battery package 100A may include an insulating substrate 110, a conductive elastic member 140, a conductive member 150, and a lid 160.

The insulating substrate 110 has a first surface 111, a second surface 112 located on the opposite side to the first surface 111, and a recess 113 that opens into the first surface 111. In the battery module 500A, one battery 200 is housed in the recess 113. There may be multiple batteries 200 housed in the recess 113.

The insulating substrate 110 may be made of an insulating inorganic material. Examples of the insulating inorganic material include ceramics such as aluminum oxide sintered body (alumina ceramics), aluminum nitride sintered body, mullite sintered body, or glass ceramic sintered body. The insulating substrate 110 may be made of a plurality of laminated insulating layers or a single insulating layer. The insulating layer is made of an insulating material such as aluminum oxide sintered body, glass ceramic sintered body, mullite sintered body, or aluminum nitride sintered body.

If the insulating layer is made of, for example, an aluminum oxide sintered body, the insulating substrate 110 is produced as follows. That is, first, a ceramic green sheet that will become the insulating layer is produced. A raw material powder such as aluminum oxide and silicon oxide is formed into a sheet shape together with an appropriate organic binder and organic solvent to produce a plurality of rectangular ceramic green sheets. Next, these ceramic green sheets are stacked to produce a laminate. The recess 113 and the second recess 114 are formed by providing through holes in the ceramic green sheets using a mold or the like. The laminate is then fired at a temperature of 1300 to 1600°C to produce the insulating substrate 110.

The dimensions of the insulating substrate 110 are, for example, a rectangular side length of 1 mm to 20 mm, and a thickness of the insulating substrate 110 of 0.5 mm to 5 mm. The dimensions of the recess 113 of the insulating substrate 110 can be set according to the size of the battery 200.

As shown in Figures 2 and 4, the size of the recess 113 in a plan view is slightly larger than the size of the battery 200 in a plan view. The inner wall surface of the recess 113 may be parallel to the thickness direction of the insulating substrate 110. The depth of the recess 113 is greater than the height of the battery 200 housed in the recess 113, the compressed elastic member 140, and the conductive member 150 overlapping each other. The shape of the recess 113 in a plan view is not limited to a circular shape, and can be changed depending on the shape of the battery 200.

2 to 5, the insulating substrate 110 has a second recess 114 that opens into the inner wall surface of the recess 113. Specifically, as shown in FIGS. 2 to 5, the insulating substrate 110 may have two second recesses 114. The two second recesses 114 may be opposed to each other with the recess 113 in between. The number of second recesses 114 is not limited to two, and multiple second recesses 114 may be formed along the inner circumference of the recess 113. Alternatively, the second recess 114 may be a single recess formed over the entire inner circumference of the recess 113. In other words, the second recess 114 may be a groove formed over the inner circumference of the recess 113.

The insulating substrate 110 also includes a fixing portion 115. The fixing portion 115 is a component that restricts the conductive member 150 from moving in a direction away from the bottom surface of the recess 113. With this configuration, the battery 200 housed in the recess 113 is sandwiched between the elastic member 140 and the conductive member 150. In other words, the battery 200 is pressed against the conductive member 150 by the elastic member 140, and the conductive member 150 is restricted in movement by the fixing portion 115. As a result, the battery 200 is fixed in a state where it is pressed against the conductive member 150. The elastic member 140 can absorb manufacturing errors such as variations in the height of the battery 200 and the depth of the recess 113, as well as expansion and contraction of the battery 200. The elastic member 140 can absorb impacts when assembling the battery module 500 (500A).

In this embodiment, the insulating substrate 110 has, for example, an engaging portion 115A as the fixing portion 115. The engaging portion 115A is a portion of the insulating substrate 110 that is located above the second recess 114. The engaging portion 115A has an engaging surface 115a that faces the second surface 112. The engaging surface 115a can also be said to be the upper surface (ceiling) of the second recess 114. Alternatively, the engaging portion 115A may be a protruding portion that protrudes from the inner wall surface of the recess 113 toward the center of the recess 113.

The height from the bottom surface of the recess 113 to the locking surface 115a is smaller than the height of the battery 200 housed in the recess 113, the elastic member 140 in an uncompressed state, and the conductive member 150, and is equal to the height of the battery 200, the elastic member 140 in a compressed state, and the conductive member 150, which are stacked together.

In this embodiment, the insulating substrate 110 has two locking portions 115A as shown in Figures 3 to 5. The two locking portions 115A face each other, sandwiching the recess 113. The two locking portions 115A are located at opposing corners of the insulating substrate 110. By arranging the locking portions 115A in opposing positions, sandwiching the recess 113, the position of the conductive member 150 can be stabilized. Furthermore, by locating the locking portions 115A at the corners of the insulating substrate 110, an area for providing the locking portions 115A can be easily secured, and the battery module 500A can be made smaller.

The battery package 100A includes a wiring conductor 130 on the surface and inside of the insulating substrate 110. The wiring conductor 130 includes a first electrode 131, a second electrode 132, a first connection wiring 133A, a second connection wiring 133B, a first external electrode 134A, and a second external electrode 134B.

The first electrode 131 is located on the bottom surface of the recess 113 and is electrically connected to the first external electrode 134A by the first connection wiring 133A. The first electrode 131 may cover the entire bottom surface of the recess 113. The first electrode 131 may also extend from the bottom surface of the recess 113 to the inside of the insulating substrate 110 as shown in FIG. 4. When the first electrode 131 extends to the inside of the insulating substrate 110, the first connection wiring 133A is located in a thick part of the insulating substrate 110, so that it is superior in terms of strength. The first electrode 131 may be contained within the bottom surface of the recess 113 in a planar view. In other words, the first electrode 131 may not extend to the inside of the insulating substrate 110, and the first connection wiring 133A may penetrate from the bottom surface of the recess 113 to the second surface 112 and connect to the first external electrode 134A. In this case, the path from the battery 200 to the first external electrode 134A is shorter and has lower resistance, improving the efficiency of extracting power from the battery 200 housed in the recess 113.

The second electrode 132 is located on the insulating substrate 110 and is electrically connected to the second external electrode 134B by the second connection wiring 133B. The second electrode 132 may be located on at least one of the engagement surfaces 115a of the insulating substrate 110. The second electrode 132 may extend from the engagement surface 115a to the inside of the insulating substrate 110. The second electrode 132 may cover the entire surface of the engagement surface 115a. In this embodiment, as shown in Figures 3 and 4, the second electrode 132 is located on each of the engagement surfaces 115a of the two engagement portions 115A in the insulating substrate 110. By having a plurality of second electrodes 132 in this way, the probability that at least one of the second electrodes 132 is electrically connected to the conductive member 150 can be improved, and therefore the reliability of the electrical connection can be improved.

The first external electrode 134A and the second external electrode 134B are each located on the second surface 112 of the insulating substrate 110. The first external electrode 134A and the second external electrode 134B may extend from the second surface 112 of the insulating substrate 110 to the side surface (including the corner between the side surfaces).

Since the first external electrode 134A and the second external electrode 134B are both located on the second surface 112 of the insulating substrate 110, the battery package 100A, in other words, the battery module 500A, can be surface mounted on a mounting substrate.

The elastic member 140 may be any elastic and conductive member, and may be, for example, a leaf spring or a disc spring that is positioned so as to be convex in a direction away from the bottom surface of the recess 113, as shown in Figures 2 and 4. The elastic member 140 is positioned on the first electrode 131, and when one or more batteries 200 are housed in the recess 113, it is positioned between the first electrode 131 and the bottom electrode 201 of the battery 200. The first electrode 131 and the bottom electrode 201 of the battery 200 housed in the recess 113 are electrically connected via the elastic member 140. Furthermore, when the battery 200 is housed in the recess 113, the elastic member 140 biases the battery 200 in a direction away from the bottom surface of the recess 113.

The conductive member 150 is a member for electrically connecting the upper electrode 202 of the battery 200 and the second electrode 132. The conductive member 150 may be formed, for example, from a metal plate. The conductive member 150 abuts against the upper electrode 202 of the battery 200 housed in the recess 113. When two or more batteries are housed in the recess 113 stacked vertically, the conductive member 150 abuts against the upper electrode 202 of the battery 200 that is furthest from the bottom surface of the recess 113. The material of the conductive member 150 may be a metal. By using a metal, a conductive member 150 with excellent conductivity and durability can be realized.

2 to 4, the conductive member 150A includes a main body portion 151 that contacts the upper electrode 202 of the battery 200, and a fixed portion 152 that is fixed to the corresponding locking portion 115A. The main body portion 151 may have a shape that overlaps with the battery 200 or is slightly smaller than the battery 200 when the battery module 500A is viewed from above. When two or more batteries are stacked vertically and housed in the recess 113, the main body portion 151 contacts the upper electrode 202 of the battery 200 that is furthest from the bottom surface of the recess 113. The fixed portion 152 is a portion that extends radially outward from the main body portion 151 in a plan view. The fixed portion 152 may extend in a straight line from the main body portion 151 in a cross-sectional view. Alternatively, the fixed portion 152 may have a curved or bent portion. In either case, the elastic force of the fixed portion 152 can be set according to the width, thickness, and shape of the fixed portion 152, and the force with which the fixed portion 152 is pressed against the second electrode 132 can be adjusted. Also, the force with which the main body portion 151 is pressed against the upper electrode 202 of the battery 200 can be adjusted. As a result, the reliability of the electrical connection between the second electrode 132 and the conductive member 150, and between the battery 200 and the conductive member can be improved.

The height LM of the elastic member 140 in the compressed state can be set according to the depth of the recess 113, the thickness of the locking portion 115A, the thickness of the conductive member 150, the dimensions (thickness) of the battery, etc. By appropriately setting the height LM of the elastic member 140 in the compressed state, the fixed portion 152 becomes more likely to be locked to the locking portion 115A. As shown in Figure 4, the height LM of the elastic member 140 in the compressed state is the distance between the bottom surface of the battery 200 and the bottom surface of the peripheral portion of the elastic member 140 (the portion abutting the recess 113). The deformation amount of the elastic member 140 is the difference between the height in the uncompressed state and the height in the compressed state.

The conductive member 150 is pressed against the engaging surface 115a by one or more batteries 200 biased by the elastic member 140, and the upper surface of the conductive member 150 abuts against the engaging surface 115a of the second electrode 132, electrically connecting the second electrode 132 to the upper surface of the conductive member 150. The lower surface of the conductive member 150 abuts against the upper electrode 202 of the battery 200, so that the conductive member 150 and the battery 200 are electrically connected. This electrically connects the upper electrode of the battery 200 to the second electrode 132. The conductive member 150 and the upper electrode 202 may be joined by, for example, a conductive bonding material. The conductive member 150 may be integrated with the exterior of the battery 200. When two or more batteries are housed in the recess 113, the conductive member 150 may be fixed to the upper electrode 202 of the battery 200 that is furthest from the bottom surface of the recess 113.

The lid 160 may close the opening of the recess 113. The lid 160 is electrically insulated from the first electrode 131 and the second electrode 132. The lid 160 is made of metal. As shown in FIG. 2 and FIG. 4, the frame-shaped metal film 122 may be positioned on the first surface 111, and the lid 160 may be joined onto the frame-shaped metal film 122. The frame-shaped metal film 122 may be formed on the first surface 111 by metallization. A nickel film may be formed by plating on the surfaces of the frame-shaped metal film 122 and the lid 160 to improve the joining property with the brazing material. For the metal lid 160, it is preferable to use a material that has a small thermal expansion difference with ceramics, and for example, an iron-nickel (Fe-Ni) alloy or an iron-nickel-cobalt (Fe-Ni-Co) alloy may be used.

The opening of the recess 113 is closed with the lid 160, so that the space S surrounded by the lid 160 and the insulating substrate 110 is hermetically sealed or vacuum sealed. The lid 160 and the frame-shaped metal film 122 may be joined using a joining material such as a brazing material. In this case, the entire surface is heated by reflow heating. Alternatively, direct seam welding, laser welding, or electron beam welding may be used to join the lid 160 and the frame-shaped metal film 122. These welding methods are joining by localized heating of the joint, so that hermetically sealing or vacuum sealing can be achieved at a lower temperature than when brazing is used, which is joining by overall heating (reflow heating). Sealing at a low temperature reduces the thermal impact on the battery 200, and a low dew point airtight environment or low dew point vacuum environment can be achieved.

If the volume of the space S minus the volumes of the battery 200, conductive member 150, and elastic member 140 located in the space S is defined as the gap volume, the ratio of the gap volume to the volume of the space S may be set to, for example, 5% to 30%. The gap amount between the lid body 160 and the conductive member 150 may be set to, for example, 0.1 mm to 0.8 mm. These may be set for the battery module 500A in an initial state in which the battery 200 is not expanded and no external force is applied to the lid body 160. By setting the gap volume ratio or the gap amount in this manner, when the battery 200 expands due to high temperature or gas is generated, the internal stress or internal pressure of the battery 200 is alleviated, improving the durability of the battery 200. In addition, even if external stress is applied to the lid body 160, the stress applied to the battery 200 is reduced due to the gap between the lid body 160 and the conductive member 150.

Alternatively, the space S may be sealed in an atmosphere such as a nitrogen atmosphere, an argon gas atmosphere, or a vacuum, with a dew point of, for example, -20 degrees or less. In this case, even if the environmental temperature and humidity rise, chemical reactions between the moisture or oxygen and the battery material are suppressed, improving the heat resistance and lifespan of the battery 200.

Battery 200 may be a coin battery in which battery materials such as an electrolyte material, a positive electrode, a negative electrode, and a separator are placed in a metal container and sealed. Coin batteries are sometimes called button batteries. Battery 200 may be a primary battery or a secondary battery. Battery 200 also includes not only chemical batteries, but also power supply elements such as electric double layer capacitors and electric double layer capacitors.

The battery 200 has electrodes (upper electrode 202, lower electrode 201) on the upper and lower surfaces. The upper electrode 202 of the battery 200 is a positive electrode or a negative electrode. By housing the battery 200 having electrodes on the upper and lower surfaces in the battery package 100 of the present disclosure, the battery 200 is surface-mounted on a mounting substrate. The internal configuration and materials of the battery 200 are not particularly limited as long as the battery 200 has electrodes on the upper and lower surfaces. For example, the battery 200 may be an all-solid-state battery having a structure in which a solid electrolyte is sandwiched between a positive electrode and a negative electrode. The battery 200 may have a current collector on the outside of the positive electrode and the negative electrode. The battery 200 may be round or cylindrical, square or prismatic, or another shape.

Even if the battery 200 is a coin battery that cannot be surface-mounted on a mounting board by itself, it can be surface-mounted on a mounting board by using the battery package 100A. For example, even if the battery material of the battery 200 is a sulfide-based battery material, by using an already sealed coin battery, it can be easily sealed and made into a surface-mount type even if the working environment is not a special dry atmosphere. In addition, it can be surface-mounted on a mounting board even if the working environment is not a special dry atmosphere, which increases the productivity of the circuit board device.

Furthermore, the battery package 100A allows the coin battery to be hermetically sealed at a higher level than a typical coin battery. In a typical coin battery, the positive and negative electrodes are sealed with a resin material such as a gasket, so there is a concern that moisture may infiltrate from the outside over time, causing deterioration of the battery material. The hermetic sealing provided by the battery package 100A of the present disclosure can block the intrusion of moisture from the outside into the coin battery. Blocking moisture improves the life of the coin battery. In particular, in sulfide-based batteries, there is a concern that moisture infiltrating from the external environment may cause hydrogen sulfide and other substances to be generated. Blocking moisture can reduce the generation of hydrogen sulfide and other substances. In the case of a coin battery, the battery material is doubly sealed by the metal container and the battery package 100A, so leakage of sulfide material from the battery package 100A can be significantly reduced.

As described above, in the battery package 100A according to embodiment 1, the elastic member 140 is positioned between the battery 200 and the first electrode 131, so the elastic member 140 is not electrically connected to the lid body 160 or the like and is not electrically connected to the outside of the battery package 100A. This prevents discharge to the outside from members other than the external electrodes, such as the lid body 160, so power can be efficiently extracted from the battery 200 via the first external electrode 134A and the second external electrode 134B.

Also, the battery package 100A is provided with a conductive member 150 and an elastic member 140 that are fixed to the fixing portion, so that the battery can be fixed without using conductive resin. This makes it possible to realize a battery module with high long-term reliability. Furthermore, by providing the elastic member 140, it is possible to absorb variations in the height of the battery or the depth of the recess in the battery package.

(Another example of a metallized pattern on the second surface)
FIG. 6 is a bottom view of a battery package 100A1 in which a seal pattern is formed on the second surface of the insulating substrate.

As shown in FIG. 6, the second surface 112 of the insulating substrate 110 may have a seal pattern 136 surrounding the first external electrode 134A and the second external electrode 134B. The seal pattern 136 is made of a conductive material such as a solderable metal. The seal pattern 136 may surround each of the first external electrode 134A and the second external electrode 134B.

By joining the seal pattern 136 to the pattern of the mounting substrate with solder, the first external electrode 134A and the second external electrode 134B located inside the seal pattern 136 can be sealed. In other words, the battery package 100A1 or the battery module 500A1 can be mounted on the substrate so that neither the first external electrode 134A nor the second external electrode 134B of the battery package 100A1 is exposed to the external environment. Therefore, even if water penetrates the mounting substrate, no electrical short circuit occurs between the first external electrode 134A and the second external electrode 134B, and no leakage current occurs from the battery module 500A1. Furthermore, sealing by solder joining can be performed simultaneously with joining the first external electrode 134A and the second external electrode 134B to the electrodes of the mounting substrate with solder.

As shown in FIG. 5, when the seal pattern 136 is not located on the second surface 112 of the insulating substrate 110, the periphery of the battery module 500A can be sealed with a sealing material such as a resin material. In other words, the battery package 100A or the battery module 500A can be mounted on the substrate so that neither the first external electrode 134A nor the second external electrode 134B of the battery package 100A is exposed to the external environment.

(Another example of elastic member)
7, 8, 9 and 10 are diagrams showing other examples of the elastic member.

The elastic member 140 is not limited to the example shown in FIG. 4, and may be, for example, a leaf spring of another shape, a coil spring formed from a metal wire, conductive rubber, or conductive sponge.

For example, the elastic member 140 may be a leaf spring 140A that is convex in a direction approaching the bottom surface of the recess 113 as shown in FIG. 7. The leaf spring may be dish-shaped or hat-shaped, and may have a through hole or slit. The leaf spring may be a plurality of leaf springs in which a hat-shaped spring is divided. Alternatively, the elastic member 140 may be configured to include at least one cantilever spring 140B as shown in FIG. 8, or may be configured to include a plurality of cantilever springs as shown in FIG. 24. When a cantilever spring 140B is used, multiple cantilever springs may be evenly arranged. Alternatively, the elastic member 140 may be a coil spring 140C as shown in FIG. 9.

Also, as shown in FIG. 10, the elastic member 140 may be a leaf spring or a disc spring positioned so as to be convex from the lower electrode 201 of the battery 200 toward the bottom surface of the recess 113. Furthermore, the elastic member 140 may be fixed to the lower electrode 201 of the battery 200 and integrated with the exterior of the battery 200. When two or more batteries are housed in the recess 113, the elastic member 140 may be fixed to the lower electrode 201 of the battery 200 closest to the bottom surface of the recess 113.

Alternatively, the elastic member 140 may be a conductive rubber or a conductive sponge. By using graphene meso sponge (GMS) as the conductive sponge, an elastic member 140 with excellent conductivity and durability can be realized.

(Example with metal frame)
FIG. 11 is a cross-sectional view of a battery module 500A2 including a battery package 100A2 having a metal frame.

As shown in FIG. 11, the battery package 100A2 may have a metal frame 123 located above the first surface 111. In this case, the metal frame 123 may be joined to the frame-shaped metal film 122 by brazing material, and the lid 160 may be joined to the metal frame 123. The metal frame 123 and the lid 160 may be joined by, for example, seam welding, direct seam welding, laser welding, or electron beam welding. In particular, seam welding is resistance welding via the metal frame 123, and is advantageous in terms of localized heating of the joint. Although a current is applied to the lid 160 during seam welding, the lid 160 is not electrically connected to the battery 200, so the battery 200 is not damaged by the current during seam welding. Furthermore, since the conductive member 150 is located between the lid 160 and the battery 200, the impact of radiant heat from the lid 160 generated during welding on the battery 200 is also reduced.

A nickel film may be formed on the surface of the metal frame 123 by plating to improve bonding with brazing material. The metal frame 123 should be made of a material that has a small thermal expansion difference with ceramics, such as an iron-nickel (Fe-Ni) alloy or an iron-nickel-cobalt (Fe-Ni-Co) alloy.

(Another example regarding the locking portion)
12 and 13 are plan views of a battery package 100A3 and a battery package 100A4, respectively, having locking parts in a different form from the battery package 100A shown in Figs. 1 to 5. They are plan views showing another state of the locking parts provided on the insulating substrate. Fig. 14 is a cross-sectional view taken along line XIV in Fig. 13.

The direction of the line connecting the two opposing locking portions 115A may be in any direction. For example, as in the battery package 100A3 shown in FIG. 12, the locking portion 115A may be located on a side of the insulating substrate 110 instead of a corner.

13 and 14, the second recess 114 may open to the first surface 111 as if a notch had been made from the recess 113. In other words, the end of the upper surface of the second recess 114 is located outside the end of the lower surface in a plan view. In other words, the inner surface of the locking portion 115A is located outside the inner wall surface of the recess 113.
The opening of the second recess 114 guides the insertion of the fixed portion 152 into the second recess 114, facilitating engagement between the fixed portion 152 and the locking portion 115A.

(Configuration for facilitating insertion of conductive member 150)
Fig. 15 is a cross-sectional view showing how to assemble the battery module 500A shown in Fig. 1, which has an inclined surface at the locking portion 115A. Fig. 16 is a cross-sectional view showing how to assemble the battery module 500A shown in Fig. 1, which has a stepped surface at the locking portion 115A.

15 and 16, in the assembly process of the battery module 500A, the conductive member 150 is inserted into the recess 113 by being pushed into the recess 113 so as to be deformed convexly downward. As shown in FIG. 15 and FIG. 16, the upper surface of the locking portion 115A may be a stepped surface or an inclined surface approaching the center of the recess 113. In other words, the protrusion amount of the locking portion 115A may gradually increase from the first surface 111 side toward the second surface 112 side. The inclination angle of the inclined surface approximating this stepped surface or the inclination angle of this inclined surface may be in the range of 1 degree to 45 degrees with respect to the thickness direction of the insulating substrate 110. The number of steps of the stepped surface may be one step or two or more steps. Even if there is a dimensional error in the insulating substrate 110 or the conductive member 150, or both, the stepped shape or inclined surface allows the fixed portion 152 of the conductive member 150 to be smoothly inserted into the second recess 114.

The conductive member 150 may have a material or a shape that is easily deformed downwardly convex, or both. This makes it easy to insert the conductive member 150 into the recess 113. The conductive member 150 may also have a material or a shape that is difficult to deform upwardly convex, or both. This makes it difficult for the fixed portion 152 of the conductive member 150 to come out of engagement with the locking portion 115A.

FIG. 17 is a plan view showing how the battery module 500A5 is assembled. The insulating substrate 110 of the battery module 500A5 opens to the first surface 111 and the recess 113 on the side of the locking portion 115A. In other words, the second recess 114 of the battery module 500A5 opens to the first surface 111 on the side of the locking portion 115A. FIG. 18 is a cross-sectional view taken along lines XVIII-A and XVIII-B in FIG. 17. FIG. 19 is a cross-sectional view showing another example of engagement between the fixed portion and the locking portion. FIG. 20 is a cross-sectional view taken along lines XX-A and XX-B in FIG. 17.

17 and 18, the second recess 114 of the battery package 100A5 may open into the recess 113 below the locking portion 115A, and may open into the first surface 111 and the recess 113 on the side of the locking portion 115A. This configuration guides the insertion of the fixed portion 152 into the second recess 114 and below the locking portion 115A, and makes it easier to fix the conductive member 150.

As shown in Figures 17 and 20, first, the fixed part 152 and the main body part 151 are inserted into the second recess 114 and the recess 113, respectively, through the opening in the first surface 111. Next, the conductive member 150 is rotated to move the fixed part 152 below the locking part 115A. To facilitate the rotation of the conductive member 150, the upper surface of the main body part 151 may have irregularities or protrusions.

18, the corner of the fixed part 152 on the front side in the rotational direction may be chamfered so that the fixed part 152 can easily move downward of the locking part 115A. The corner of the locking part 115A on the side that meets the fixed part 152 may be chamfered so that the fixed part 152 can easily move downward of the locking part 115A. 19, the entire part or the tip of the fixed part 152 may be angled with the main body part 151 so that the front side in the rotational direction is lower so that the fixed part 152 can easily move downward of the locking part 115A. The configuration in which the fixed part 152 is angled with the main body part 151 can further reduce the possibility that the fixed part 152, which has once entered below the locking part 115A due to rotation, will move back. The surface of the fixed portion 152 that comes into contact with the insulating substrate 110 may be rough so that the conductive member 150 is less likely to rotate in reverse due to vibration of the battery package 100 (100A).

(Another example of a battery)
Fig. 21 is a partially enlarged cross-sectional view of a battery module 500A using a battery 200X, which is a thin-film all-solid-state battery, as the battery. Fig. 22 is a partially enlarged cross-sectional view of a battery module 500A using a plurality of thin-film all-solid-state batteries 200X as the battery.

As shown in FIG. 21, the battery module 500A may include a battery 200X that is a thin-film type all-solid-state battery. The battery 200X has a configuration in which an anode layer 220, an electrolyte layer 230, and a cathode layer 240 are laminated on a metal plate 210, and the metal plate 210 functions as a current collector. The metal plate 210 is, for example, a plate of copper, aluminum, stainless steel, or the like, and the thickness of the metal plate 210 is, for example, 0.1 mm to 0.5 mm. The anode layer 220, the electrolyte layer 230, and the cathode layer 240 are formed, for example, by a deposition method or a sputtering method. The battery 200X may include a resin cover 250 that covers the end face of the anode layer 220, the end face of the electrolyte layer 230, and the end face of the cathode layer 240, and the resin cover 250 is made of insulating resin. The battery module 500A may include an all-solid-state battery that is not a thin-film type.

In the case of the battery package 100A shown in FIG. 21, the metal plate 210 corresponds to the bottom electrode 201, and the positive electrode layer 240 corresponds to the top electrode 202. The negative electrode layer 220, electrolyte layer 230, and positive electrode layer 240 are stacked in this order from the bottom metal plate 210, but the negative electrode layer 220 and the positive electrode layer 240 may be stacked in reverse. In this case, the negative electrode layer 220 corresponds to the top electrode 202.

The position of the end face of the anode layer 220, the position of the end face of the electrolyte layer 230, and the position of the end face of the cathode layer 240 may be offset. For example, the anode layer 220, the electrolyte layer 230, and the cathode layer 240 may be stacked in the order of smaller or larger. The electrolyte layer 230 may be made larger than the cathode layer 240 and the anode layer 220. In this case, the possibility of a short circuit between the cathode layer 240 and the anode layer 220 in the lateral direction can be reduced.

22, the battery module 500A may include a plurality of batteries 200X. The plurality of batteries 200X may be stacked vertically in series in the recess 113 of the battery package 100. A conductive adhesive may be interposed between the plurality of batteries 200X. The end of the electrolyte layer 230 may cover the end of the negative electrode layer 220. The plurality of batteries 200X are efficiently manufactured by forming a thin-film battery on a large metal plate and cutting it into individual pieces of a predetermined size. The plurality of batteries 200X may be connected by contact without an adhesive. The contact resistance between the plurality of batteries 200X can be reduced by sandwiching the plurality of batteries 200X between the elastic member 140 and the conductive member 150 and pressing them.

Generally, thin-film all-solid-state batteries have high energy density, high safety, and excellent recycle life. In addition, as described above, by using the battery 200X having the metal plate 210 in the battery module 500, mass production of the battery 200X becomes possible, improving the productivity of the battery module 500A. Specifically, after forming the negative electrode layer 220, electrolyte layer 230, and positive electrode layer 240 on the metal plate 210, the battery 200X is cut out to a size that matches the recess 113 of the insulating substrate 110 by dicing or the like, and is placed in the recess 113 of the insulating substrate 110. This improves the productivity of the battery module 500A.

In addition, by using the battery 200X having the metal plate 210 in the battery module 500A, the adhesion between the metal plate 210 and the negative electrode layer 220, the adhesion between the negative electrode layer 220 and the electrolyte layer 230, and the adhesion between the positive electrode layer 240 and the electrolyte layer 230 are increased. This increases the efficiency of extracting power from the battery 200X.

(Another example of the fixing part)
In the following, an example will be described in which the fixing portion 115 is a locking metal fitting or a fixing metal film that is fixed or joined to the insulating substrate 110.

Figure 23 is a plan view of battery module 500A6 with the lid removed. Figure 24 is a cross-sectional view taken along line XXIV in Figure 23. Figure 25 is a plan view of battery module 500A7 with the lid removed. Figure 26 is a cross-sectional view of battery module 500A8.

23 and 24, the insulating substrate 110 may include, as the fixing portion 115, a locking metal fitting 115B fixed or joined to the insulating substrate 110. Compared with the insulating substrate 110 including the second recess 114, the insulating substrate 110 including the locking metal fitting 115B is easy to manufacture. Furthermore, the strength of the insulating substrate 110 can be improved, and the strength of the fixing portion 115 can be improved. The insulating substrate 110 may include a notch 116 (see FIG. 24) that opens to the first surface 110 and the recess 113 so that the locking metal fitting 115B and the conductive member 150 are unlikely to come into contact with the lid body 160, and the locking metal fitting 115B may be joined to the bottom surface of the notch 116. The depth of the notch 116 may be greater than the height of the locking metal fitting 115B so that the locking metal fitting 115B and the conductive member 150 are unlikely to come into contact with the lid body 160. If the depth of the notch 116 is equal to or smaller than the height of the locking metal fittings 115B, a metal frame 123 or an insulating frame made of a ceramic material, or both, may be located between the insulating substrate 110 and the lid 160. In FIG. 23, the bottom surface of the notch 116 may be regarded as the first surface 110, and the part of the insulating substrate 110 rising outside the notch 116 may be regarded as the insulating frame. That is, the insulating substrate 110 may have the locking metal fittings 115B on the first surface 110 and the insulating frame on the outside of that.

The locking metal fitting 115B may be fixed to the insulating substrate 110 with the conductive member 150 pressed against the battery 200. The locking metal fitting 115B may be joined to the fixing metal film 115C on the insulating substrate 110. The fixing metal film 115C may also serve as the second electrode 132 (see FIG. 26).

As shown in FIG. 25, the locking fitting 115B may open to the recess 113 and to the side. By rotating the conductive member 150, the fixed portion 152 is inserted into the locking fitting 115B through the side opening of the locking fitting 115B.

26, the insulating substrate 110 may include, for example, a fixing metal film 115C as the fixing portion 115. The fixed portion 152 may be joined to the fixing metal film 115C by brazing, soldering, or metal welding using laser irradiation. Compared to the insulating substrate 110 including the second recess 114, the insulating substrate 110 including the fixing metal film 115C is easy to manufacture. Furthermore, the strength of the insulating substrate 110 can be improved, and the strength of the fixing portion 115 can be improved. The fixing metal film 115C may also serve as the second electrode 132. The fixing metal film 115C may be located on the bottom surface of the cutout 116 so that the conductive member 150 is unlikely to come into contact with the lid 160. A frame may be located between the insulating substrate 110 and the lid 160 so that the conductive member 150 is unlikely to come into contact with the lid 160.

(Another example of the conductive member 150)
FIG. 27 is a cross-sectional view of the battery module 500A9 in which the conductive member is reversible. As shown in FIG. 27, the conductive member 150 may be a reversible leaf spring having a convex portion in the center that presses the battery 200 from above by being inverted upside down. The upper view of FIG. 27 is a cross-sectional view showing the state of the conductive member 150 before being inverted, and the lower view of FIG. 27 is a cross-sectional view showing the state of the conductive member 150 after being inverted. The conductive member 150 may be inserted into the second recess 114 and the recess 113 in an upwardly convex shape. The conductive member 150 may be in an upwardly convex shape before the fixed portion 152 is inserted into the second recess 114. The conductive member 150 may be inverted to a downwardly convex shape during or after insertion. The battery is pressed downward by the main body portion 151 of the conductive member 150 in a downwardly convex shape, and the elastic member 140 is compressed. The compressed elastic member 140 presses the battery 200 against the conductive member 150, and the conductive member 150 is restricted in movement by the fixing portion 115, thereby fixing the battery 200. Depending on the thickness of the conductive member 150 or the reversible convex portion that the conductive member 150 has in the center, the battery package 100A9 can accommodate batteries 200 of various thicknesses and various numbers.

In the configuration for rotating the conductive member 150 described above with reference to Figures 17 to 20, while the conductive member 150 is rotating, the conductive member 150 has an upwardly convex shape, so that the fixed portion 152 does not come into contact with the locking surface 115a, and the conductive member 150 can rotate easily. After the conductive member 150 is positioned below the locking portion 115A, the conductive member 150 is inverted to become downwardly convex, so that the fixed portion 152 can come into contact with the locking surface 115a. This contact electrically connects the fixed portion 152 to the second electrode 132.

[Embodiment 2]
Other embodiments of the present disclosure are described below. For ease of explanation, members having the same functions as those described in the above embodiments are denoted with the same reference numerals, and their explanations will not be repeated. Battery modules 500B, 500B2 to 500B6 described in embodiment 2 are examples of battery modules 500 according to the present disclosure. Battery packages 100B, 100B2 to 100B6 described in embodiment 2 are examples of battery packages 100 according to the present disclosure.

FIG. 28 is a plan view showing the battery module 500B with the lid removed. FIG. 29 is a cross-sectional view taken along line XXIX in FIG. 28. FIG. 30 is a cross-sectional view taken along line XXX in FIG. 28.

As shown in Figures 28 to 30, in the battery package 100B according to this embodiment, the conductive member 150 includes a main body portion 151, a connection portion 153, and a fixed portion 152. The main body portion 151 is a portion that abuts against the upper electrode 202 of the battery 200. The connection portion 153 is a portion that is electrically connected to the corresponding second electrode 132. The fixed portion 152 is a portion that is fixed to the corresponding fixing portion 115. When the fixing portion 115 is the locking portion 115A, the fixed portion 152 is a portion that is locked to the locking portion 115A.

The conductive member 150 may have only one connection portion 153, or two or more. Two or more connection portions 153 can improve the reliability of the electrical connection between the second electrode 132 and the conductive member 150. The conductive member 150 may have two or more fixed portions 152. The center of the force pressing against the battery 200 may be located on a line segment or within a polygon connecting the two or more fixed portions 152. The two fixed portions 152 may be located at diagonal corners of the insulating substrate 110.

The connecting portion 153 and the fixed portion 152 each extend radially outward from the main body portion 151 in a plan view. The elastic force of the connecting portion 153 can be set according to the width, thickness, and shape of the connecting portion 153, and the force with which the connecting portion 153 is pressed against the second electrode 132 can be adjusted. The elastic force of the fixed portion 152 can be set according to the width, thickness, and shape of the fixed portion 152, and the force with which the main body portion 151 is pressed against the upper electrode 202 of the battery 200 can be adjusted. As a result, the reliability of the electrical connection between the second electrode 132 and the conductive member 150, and between the battery 200 and the conductive member can be improved.

The extension direction of the connection portion 153 may be different from the extension direction of any of the fixed portions 152 in a plan view. The extension direction of the connection portion 153 forms an angle with the extension direction of the nearest fixed portion 152 in a plan view. "Forming an angle" means that the angle between the two directions is greater than 0 degrees. Since the connection portion 153 and the fixed portion 152 are located in different directions with respect to the center of the recess 113 in a plan view, the second electrode 132 is disposed in a different direction from the locking portion 115A. When the insulating substrate 110 has a rectangular shape in a plan view and the battery 200 has a circular shape in a plan view, the fixing portion 115 and the second electrode can be disposed in positions where they do not overlap in a plan view.

28 to 30 show an example in which a line connecting two opposing connection parts 153 and a line connecting two opposing fixed parts 152 intersect and form an angle. In this case, the two fixing parts 115 and the two second electrodes 132 can be disposed at the four corners of the insulating substrate 110 in a plan view. When the insulating substrate 110 is substantially square in a plan view, the intersection angle is approximately 90°. This allows the battery package 100B to be made smaller. In the battery package 100B, the insulating substrate 110 has a notch 116 that opens to the first surface 111 and the recess 113, and the second electrode 132 may be located on the bottom surface of the notch 116.

As shown in FIG. 28, the battery package 100 (100B) may have a plurality of second electrodes 132 and a plurality of locking portions 115A. In such a case, in a plan view, the two second electrodes 132 may be located at positions facing each other across the recess 113, and the two locking portions 115A may be located at positions facing each other across the recess 113. Furthermore, the line connecting the two second electrodes 132 and the line connecting the two locking portions 115A may form an angle. By arranging the second electrodes 132 and the locking portions 115A in this way, the pressing and fixing by the elastic member 140 and the conductive member 150 is stabilized. Even if the elastic member 140 rotates and twists around the line connecting the opposing locking portions 115A as a central axis, at least one of the two connection portions 153 will abut against the second electrode 132. When the battery package 100 (100B) has three or more locking portions 115A, the three or more locking portions 115A may be positioned in line symmetry or rotational symmetry to surround the recess 113.

In a cross-sectional view, the connection portion 153 and the fixed portion 152 may each extend in a straight line from the main body portion 151, or may have a curved or bent portion between the connection portion with the main body portion 151 and the end. In FIG. 29, the connection portion 153 has a U-shaped curved portion that is convex upward (toward the lid body 160) and a flat portion that abuts against the second electrode 132.

31, 32, and 33 are cross-sectional views taken along line XXIX of the battery module 500B in FIG. 28, showing an example in which the connection portion 153 of the conductive member 150 has a different shape. In FIG. 31, the connection portion 153 has a convex portion that protrudes toward the lid body 160 and a flat portion that abuts against the second electrode 132.

In FIG. 32, the connection portion 153 has a convex portion that protrudes toward the lid 160, a flat portion that abuts the second electrode 132, and an end that is curved (rounded) upward. In FIG. 33, the connection portion 153 has a convex portion that protrudes toward the lid 160, and an end that is curved downward. Because the end is curved, the conductive member 150 can be smoothly inserted into the recess 113 even if the connection portion 153 contacts the insulating substrate 110.

As shown in Figures 29, 31, 32 and 33, by having the connection portion 153 have a curved or bent portion, it is easy to adjust the elastic force according to the width and shape of the connection portion 153. In addition, depending on the shape of the curved or bent portion, it is easy to adjust the force with which the connection portion 153 abuts against the second electrode 132. In addition, by having the connection portion 153 have a curved or bent portion, it can have elasticity in a direction transverse to the main body portion 151, i.e., in the radial direction. Furthermore, the connection portion 153 may have elasticity in the thickness direction of the main body portion 151. This elasticity can absorb dimensional errors in the thickness direction during manufacturing and impacts during assembly.

Furthermore, by having a curved or bent portion in the connection portion 153, it is possible to accommodate changes in the thickness of the battery 200 relative to the thickness of the battery package 100, the depth of the recess 113, or the height from the bottom surface of the recess 113 to the engagement surface 115a. In other words, by using a conductive member 150 having a curved or bent portion, one insulating substrate 110 and elastic member 140 can accommodate batteries of different thicknesses. As a specific example, by changing the bending direction of the bent portion, it is possible to change the range of thicknesses of the battery 200 that can be accommodated. For example, when the bent portion bends upward, it can accommodate thin batteries, and when it bends downward, it can accommodate thick batteries.

As shown in Figures 28, 29, 32, and 33, the insulating substrate 110 may have a notch 116 that opens to the first surface 111 and the recess 113, and the second electrode 132 may be located on the bottom surface of the notch 116. Alternatively, as shown in Figure 31, the second electrode 132 may be located on the first surface 111. In either case, the second electrode 132 is exposed on the upward surface. Furthermore, the second electrode 132 abuts against the lower surface of the connection portion 153 of the conductive member 150 and is electrically connected.

This configuration allows visual confirmation of the appearance of the second electrode 132 and the connection between the conductive member 150 and the second electrode 132. Furthermore, when the second electrode 132 is located on the first surface 111, the second electrode 132 and the frame-shaped metal film 122 can be formed in the same process. For example, the second electrode 132 and the frame-shaped metal film 122 can be formed in the same process by screen printing.

Figures 34, 35, and 36 are cross-sectional views taken along the line XXVIII of the battery module 500B in Figure 28, showing an example in which the fixed portion 152 of the conductive member 150 has a different shape. In Figures 34 to 36, the conductive member 150 has a bent portion that bends downward at the boundary between the main body portion 151 and the fixed portion 152 or at the fixed portion 152.

As shown in Figures 34, 35, and 36, the conductive member 150 may have a curved or bent portion in the fixed portion 152, and may have elasticity in a direction crossing the main body portion 151, i.e., in the radial direction. As shown in Figure 34, the fixed portion 152 deforms so as to shrink in the radial direction, making it easy to insert the conductive member 150 into the recess 113. After insertion, the fixed portion 152 returns to its original shape so as to expand in the radial direction, and the fixed portion 152 is locked to the locking portion 115A. The conductive member 150 is less likely to shift in the radial direction.

As shown in Figures 35 and 36, the upper surface of the locking portion 115A may be a stepped or inclined surface that approaches the center of the recess 113. In other words, the amount of protrusion of the locking portion 115A increases stepwise or gradually from the first surface 111 side toward the second surface 112 side. The inclination angle of the inclined surface approximating this stepped surface or the inclination angle of this inclined surface may be in the range of 1 degree to 45 degrees with respect to the thickness direction of the insulating substrate 110. With this configuration, the fixed portion 152 of the conductive member 150 can be easily inserted below the locking portion 115A.

Figure 37 is a plan view showing how to assemble the battery module 500B2. In the battery package 100B2 of the battery module 500B2, the insulating substrate 110 opens to the first surface 111 and the recess 113 on the side of the locking portion 115A. Figure 38 is a cross-sectional view taken along line XXXVIII in Figure 37. Figure 39 is a cross-sectional view taken along line XXXIX in Figure 37.

As shown in Figures 37 to 39, in the assembly process of the battery module 500B2, the fixed part 152 and the main body part 151 are inserted into the second recess 114 and the recess 113, respectively, through the opening in the first surface 111. Thereafter, the fixed part 152 moves below the locking part 115A as the conductive member 150 rotates, and the fixed part 152 can be locked to the locking part 115A. As shown in Figure 38, the fixed part 152 may have a bent part that bends upward, and the tip of the fixed part 152 may be located above the main body part 151.

(Another example)
Fig. 40 is a plan view of the battery module 500B3 with the lid removed. Fig. 41 is a cross-sectional view taken along line XLI in Fig. 40. Fig. 42 is a cross-sectional view taken along line XLII in Fig. 40. Fig. 43 is a plan view of the battery module 500B4 with the lid removed. Fig. 44 is a cross-sectional view taken along line XLIV in Fig. 43. Fig. 45 is a cross-sectional view of the battery module 500B5. Fig. 46 is a plan view of the battery module 500B6 with the lid removed. Fig. 47 is a cross-sectional view taken along line XLVII in Fig. 46. Fig. 48 is a cross-sectional view taken along line XLVIII in Fig. 46.

As shown in Figures 40, 41, 43 and 44, the insulating substrate 110 may include, as the fixing portion 115, for example, a locking fitting 115B that is fixed or joined to the insulating substrate 110. As shown in Figure 43, the locking fitting 115B may open to the recess 113 and to the side. By rotating the conductive member 150, the fixed portion 152 is inserted into the locking fitting 115B through the side opening of the locking fitting 115B.

As shown in FIG. 45, the insulating substrate 110 may include, for example, a fixing metal film 115C as the fixing portion 115. The fixed portion 152 may be joined to the fixing metal film 115C by brazing, soldering, or metal welding.

As shown in FIG. 46, the conductive member 150 may have four connection parts 153 and four fixed parts 152. However, the conductive member 150 may have three or five or more connection parts 153 and three or five or more fixed parts 152. The number of connection parts 153 and the number of fixed parts 152 of one conductive member 150 may be different.

[Embodiment 3]
Other embodiments of the present disclosure will be described below. Battery modules 500C and 500C2 described in embodiment 3 are examples of the battery module 500 according to the present disclosure. Also, battery packages 100C and 100C2 described in embodiment 3 are examples of the battery package 100 according to the present disclosure.

Figure 49 is a plan view of battery module 500C with the lid removed. Figure 50 is a cross-sectional view taken along line L in Figure 49. Figure 51 is a cross-sectional view of battery module 500C2. Battery module 500C2 differs from battery module 500C in that it has a metal frame 123.

49, 50, and 51, the battery package 100C may have a connecting portion 153 that at least partially overlaps with the corresponding fixed portion 152 in a top perspective view. The locking portion 115A is sandwiched between the connecting portion 153 and the corresponding fixed portion 152. This configuration strengthens the fixation of the conductive member 150 to the insulating substrate 110. Since the connecting portion 153 and the fixed portion 152 are located in the same direction relative to the center of the recess 113 in a plan view, the second electrode 132 is located in the same direction as the locking portion 115A. When the insulating substrate 110 has a rectangular shape in a plan view and the battery 200 has a circular shape in a plan view, the second electrode 132 is located at a corner of the insulating substrate 110, thereby making it possible to reduce the size of the battery package 100 (100C).

50 and 51, the second electrode 132 can be positioned on the upper surface of the locking portion 115A. Therefore, the second electrode 132 can abut and electrically connect with the lower surface of the connection portion 153 of the conductive member 150. In addition, the appearance of the second electrode 132 and the connection between the conductive member 150 and the second electrode 132 can be visually confirmed. In addition, the fixed portion 152 is inserted into the second recess 114 by pushing the conductive member 150, as in the example shown in FIGS. 15 and 16. Alternatively, the fixed portion 152 may be configured to be inserted into the second recess 114 by rotating the conductive member 150, as in the example shown in FIGS. 17 and 18.

As shown in FIG. 50, the insulating substrate 110 may have a notch 116 that opens into the first surface 110 and the recess 113, and the second electrode 132 may be located on the bottom surface of the notch 116, so that the conductive member 150 is unlikely to come into contact with the lid 160. As shown in FIG. 51, a metal frame 123 or an insulating frame, or both, may be located between the insulating substrate 110 and the lid 160, so that the conductive member 150 is unlikely to come into contact with the lid 160.

〔summary〕
A first aspect of the present disclosure is a battery package comprising an insulating substrate having a first surface, a second surface opposite the first surface, and a recess opening onto the first surface, a first external electrode located on the second surface, a second external electrode located on the second surface, a first electrode located on a bottom surface of the recess and electrically connected to the first external electrode, a second electrode located on the insulating substrate and electrically connected to the second external electrode, a conductive elastic member located on the first electrode, and a conductive member abutting an upper electrode of a battery contained in the recess and electrically connecting the upper electrode and the second electrode, wherein the insulating substrate has a fixing portion that limits movement of the conductive member in a direction away from the bottom surface of the recess.

Aspect 2 of the present disclosure is the battery package described in aspect 1 above, in which the second electrode is electrically connected to the upper surface of the conductive member.

Aspect 3 of the present disclosure is a battery package according to aspect 1 or 2 above, in which the conductive member includes a main body portion that abuts against the upper electrode of the battery, a connection portion that extends outward from the main body portion in a plan view and is electrically connected to the second electrode, and a fixed portion that extends outward from the main body portion in a plan view and is fixed to the fixing portion.

Aspect 4 of the present disclosure is the battery package described in aspect 3 above, in which the extension direction of the connection portion and the extension direction of the fixed portion form an angle.

Aspect 5 of the present disclosure is a battery package as described in Aspects 3 or 4 above, in which the second electrode is electrically connected to the underside of the connection portion.

Aspect 6 of the present disclosure is a battery package according to any one of aspects 1 to 5 above, having a plurality of the second electrodes and a plurality of the fixing portions.

Aspect 7 of the present disclosure is a battery package according to aspect 6 above, in which the two second electrodes are positioned opposite each other across the recess, the two fixing parts are positioned opposite each other across the recess, and an angle is formed between a line connecting the two second electrodes and a line connecting the two fixing parts.

Aspect 8 of the present disclosure is a battery package according to any one of aspects 1 to 7 above, in which the fixing portion is a locking portion having a locking surface that faces the second surface.

Aspect 9 of the present disclosure is a battery package according to aspect 8 above, in which the upper surface of the locking portion is a stepped or inclined surface that approaches the center of the recess toward the bottom surface of the recess.

Aspect 10 of the present disclosure is a battery package according to any one of aspects 3 to 5 above, or any one of aspects 6 to 9 above that cites aspect 3 above, in which the connection portion and the fixed portion overlap when viewed from above.

Aspect 11 of the present disclosure is the battery package described in aspect 10 above, in which the second electrode is located on the upper surface of the fixing portion and is electrically connected to the lower surface of the connection portion.

Aspect 12 of the present disclosure is a battery package according to aspect 8 or 9 above, or any one of aspects 9 to 11 above that cites aspect 8 above, in which the insulating substrate has a notch that opens into the recess below the engaging portion and opens into the first surface and the recess on the side of the engaging portion.

Aspect 13 of the present disclosure is a battery package according to any one of aspects 3 to 5 above, or any one of aspects 6 to 12 above that cites aspect 3 above, in which the fixed portion and/or the connection portion have a curved or bent portion and are elastic in a direction transverse to the main body portion.

Aspect 14 of the present disclosure is a battery package according to any one of claims 1 to 13, in which the conductive member is a leaf spring having a protrusion in the center that presses the battery from above when inverted upside down.

Aspect 15 of the present disclosure is a battery package according to any one of claims 1 to 7, in which the fixing portion is a fastening metal fitting joined onto the insulating substrate.

Aspect 16 of the present disclosure is a battery package according to any one of aspects 3 to 5 above, or any one of aspects 6 to 7 above that cites aspect 3 above, in which the fixed portion in the fixing portion is metal-welded.

Aspect 17 of the present disclosure is a battery module comprising a battery package according to any one of aspects 1 to 16 above, and a battery housed in a recess of the battery package.

Aspect 18 of the present disclosure is the battery module described in aspect 17 above, in which the battery is an all-solid-state battery.

Aspect 19 of the present disclosure is the battery module described in aspect 17 above, in which the battery is a thin-film, all-solid-state battery in which an anode layer, an electrolyte layer, and a cathode layer are laminated on a metal plate.

Aspect 20 of the present disclosure is the battery module described in aspect 17 above, in which the battery is a coin battery.

[Additional Notes]
The invention according to the present disclosure has been described above based on the drawings and examples. However, the invention according to the present disclosure is not limited to the above-mentioned embodiments. In other words, the invention according to the present disclosure can be modified in various ways within the scope of the present disclosure, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments are also included in the technical scope of the invention according to the present disclosure. In other words, it should be noted that a person skilled in the art can easily make various modifications or corrections based on the present disclosure. It should also be noted that these modifications or corrections are included in the scope of the present disclosure.

100, 100A, 100B, 100C Battery package 110 Insulating substrate 111 First surface 112 Second surface 113 Recess 115 Fixing portion

115A Locking portion

115a Locking surface 115B Locking metal fitting 131 First electrode 132 Second electrode 134A First external electrode 134B Second external electrode 140 Elastic member 150 Conductive member 151 Main body 152 Fixed portion 153 Connection portion 200 Battery 201 Lower electrode 202 Upper electrode 210 Metal plate 220 Negative electrode layer 230 Electrolyte layer 240

Positive electrode layer

500, 500A, 500B, 500C Battery module

Claims

an insulating substrate having a first surface, a second surface opposite to the first surface, and a recess opening into the first surface;
a first external electrode located on the second surface;
A second external electrode located on the second surface;
a first electrode located on a bottom surface of the recess and electrically connected to the first external electrode;
a second electrode located on the insulating substrate and electrically connected to the second external electrode;
a conductive elastic member located on the first electrode;
a conductive member that contacts an upper electrode of a battery accommodated in the recess and electrically connects the upper electrode and the second electrode,
The insulating substrate is provided with a fixing portion that limits movement of the conductive member in a direction away from the bottom surface of the recess.
The battery package of claim 1, wherein the second electrode is electrically connected to the upper surface of the conductive member.
The conductive member is
a main body portion that contacts the upper electrode of the battery;
a connection portion that extends outward from the main body portion in a plan view and is electrically connected to the second electrode;
The battery package according to claim 1 , further comprising: a fixed portion that extends outward from the main body portion in a plan view and is fixed to the fixing portion.
The battery package according to claim 3, wherein the extension direction of the connection portion and the extension direction of the fixed portion form an angle.
The battery package according to claim 3 or 4, wherein the second electrode is electrically connected to the underside of the connection portion.
The battery package according to any one of claims 1 to 5, comprising a plurality of the second electrodes and a plurality of the fixing portions.
The two second electrodes are located at positions facing each other across the recess,
The two fixing portions are located at positions facing each other across the recess,
The battery package according to claim 6 , wherein a line connecting the two second electrodes forms an angle with a line connecting the two fixing portions.
The battery package according to any one of claims 1 to 7, wherein the fixing portion is a locking portion having a locking surface that faces the second surface.
The battery package according to claim 8, wherein the upper surface of the locking portion is a stepped or inclined surface that approaches the center of the recess toward the bottom surface of the recess.
The battery package according to any one of claims 3 to 5, wherein the connection portion and the fixed portion overlap when viewed from above.
The battery package of claim 10, wherein the second electrode is located on the upper surface of the fixing portion and is electrically connected to the lower surface of the connection portion.
The battery package according to claim 8 or 9, wherein the insulating substrate has a cutout that opens into the recess below the engaging portion and opens into the first surface and the recess on the side of the engaging portion.
The battery package according to any one of claims 3 to 5, wherein the fixed portion and/or the connecting portion has a curved or bent portion and has elasticity in a direction transverse to the main body portion.
The battery package according to any one of claims 1 to 13, wherein the conductive member is a leaf spring having a protrusion in the center that presses the battery from above when inverted upside down.
The battery package according to any one of claims 1 to 7, wherein the fixing portion is a fastening metal fitting joined onto the insulating substrate.
The battery package according to any one of claims 3 to 5, wherein the fixed portion is metal-welded to the fixed portion.
A battery package according to any one of claims 1 to 16,
a battery housed in the recess of the battery package.
The battery module according to claim 17, wherein the battery is a solid-state battery.
The battery module according to claim 17, wherein the battery is a thin-film type all-solid-state battery in which an anode layer, an electrolyte layer, and a cathode layer are laminated on a metal plate.
The battery module of claim 17, wherein the battery is a coin battery.