WO2024128281A1

WO2024128281A1 - Package for battery, battery module, and sealing method of battery module

Info

Publication number: WO2024128281A1
Application number: PCT/JP2023/044841
Authority: WO
Inventors: 孝太郎中本
Original assignee: 京セラ株式会社
Priority date: 2022-12-15
Filing date: 2023-12-14
Publication date: 2024-06-20

Abstract

The present invention improves the connection reliability of a battery and the long-term reliability of a battery module. According to the present invention, an insulating substrate has a mounting section for mounting a battery including two electrode sections provided side by side along a first surface, a lid that covers the battery is positioned on the first surface side of the insulating substrate, the lid body is electrically insulated from a first electrode and a second electrode, and a package for the battery comprises a pressing member that presses the battery with an elastic force against the mounting section.

Description

BATTERY PACKAGE, BATTERY MODULE, AND METHOD FOR SEALING BATTERY MODULE

This disclosure relates to a battery package, a battery module, and a method for sealing a battery module.

Patent Document 1 shows a battery module that can be surface-mounted on a circuit board as a power source or auxiliary power source for small electronic devices. The battery module according to this prior art (referred to as a surface-mounted battery in Patent Document 1) has an insulating substrate (part of a component referred to as an exterior body in Patent Document 1), and a mounting section for mounting a battery (referred to as a power generating element in Patent Document 1) is located on the upper surface of the insulating substrate. The battery includes two electrode sections aligned along the upper surface of the insulating substrate.

A first external electrode (referred to as a positive terminal electrode in Patent Document 1) is located on the underside of the insulating substrate. A second external electrode (referred to as a negative terminal electrode in Patent Document 1) is located at a location on the underside of the insulating substrate separated from the first external electrode. The second external electrode is electrically connected to the second electrode. A first electrode (referred to as a positive electrode pad in Patent Document 1) is located at one end of the mounting portion of the insulating substrate in the left-right direction, and the first electrode is electrically connected to the first external electrode. A second electrode (referred to as a negative electrode pad in Patent Document 1) is located at the other end of the mounting portion of the insulating substrate in the left-right direction, and the second electrode is electrically connected to the first external electrode.

One of the two electrode parts of the battery (referred to as the positive end electrode in Patent Document 1) is electrically connected to the first electrode. The other of the two electrode parts of the battery (referred to as the negative end electrode in Patent Document 1) is electrically connected to the second electrode. One of the electrode parts of the battery is joined to the first electrode by a conductive resin (referred to as a thermoplastic resin containing a conductive material in Patent Document 1). The other electrode part of the battery is joined to the second electrode by a conductive resin. In other words, the battery is fixed to the insulating substrate by the conductive resin.

Japanese Patent Publication No. 2004-152586

The battery package according to the present disclosure comprises an insulating substrate having a first surface, a second surface opposite to the first surface, and a mounting portion located on the first surface for mounting a battery including two electrode portions, a first external electrode located on the second surface, a second external electrode located on the second surface, a first electrode located on one end of the mounting portion and electrically connected to the first external electrode, a second electrode located on the other end of the mounting portion and electrically connected to the second external electrode, a lid located on the first surface, electrically insulated from the first electrode and the second electrode, and covering the battery, and a pressing member that presses the battery toward the mounting portion by elastic force.

The battery module according to the present disclosure also includes the battery package and a battery mounted on the mounting portion, one of the two electrode portions being electrically connected to the first electrode and the other of the two electrode portions being electrically connected to the second electrode portion.

The battery module sealing method disclosed herein is a method for sealing the battery module, in which the battery module is sealed while the pressing member arranged on the upper surface side of the battery is pressed by the lid.

FIG. 1 is a schematic plan view showing a battery package and a battery module according to a first embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 2 is a schematic plan view showing a battery package and a battery module according to the first embodiment, with the metal frame omitted. FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. 3 . FIG. 4 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the first embodiment. FIG. 4 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the first embodiment. FIG. 4 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the first embodiment. FIG. 4 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the first embodiment. FIG. 4 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the first embodiment. FIG. 4 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the first embodiment. FIG. 11 is a schematic plan view showing a battery package and a battery module according to a second embodiment. 12 is a cross-sectional view taken along line XII-XII in FIG. 11 . FIG. 13 is a schematic plan view showing a battery package and a battery module according to a second embodiment in which the arrangement of leaf springs is changed. FIG. 14 is a schematic cross-sectional view taken along line XIV-XIV in FIG. 13. FIG. 11 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the second embodiment. FIG. 11 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the second embodiment. FIG. 11 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the second embodiment. FIG. 11 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the second embodiment. FIG. 11 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the second embodiment. FIG. 11 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the second embodiment. FIG. 11 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the second embodiment. 13A to 13C are schematic cross-sectional views for explaining a sealing method for a battery module according to another aspect of the second embodiment. FIG. 11 is a schematic plan view showing a battery package and a battery module according to a third embodiment. FIG. 24 is a schematic cross-sectional view taken along line XXIV-XXIV in FIG. 23. FIG. 13 is a schematic plan view showing a battery package and a battery module according to a fourth embodiment. FIG. 11 is a schematic cross-sectional view showing a battery package and a battery module according to a fourth embodiment. FIG. 13 is a schematic plan view showing a battery package and a battery module according to a fifth embodiment. 28 is a schematic cross-sectional view taken along line XXVIII-XXVIII in FIG. 27. FIG. 13 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the fifth embodiment. FIG. 13 is a schematic cross-sectional view showing a battery package and a battery module according to another aspect of the fifth embodiment. FIG. 13 is a schematic cross-sectional view showing a battery package and a battery module according to a sixth embodiment.

As the battery module is used for a long period of time, the conductive resin deteriorates due to moisture and oxygen present in the internal space of the battery module, or due to heat conduction from the environment in which the battery is used, reducing the bonding strength of the battery to the insulating substrate. This makes the battery more likely to peel off from the insulating substrate, raising concerns about a decrease in the reliability of the battery connection and the long-term reliability of the battery module.

According to the present disclosure, the battery is less likely to peel off from the insulating substrate, improving the battery connection reliability and the long-term reliability of the battery module.

The battery package and the battery module according to the embodiment will be described in detail below with reference to the drawings. However, for the sake of convenience, the drawings referred to below show only the components necessary for explaining the embodiment in a simplified manner. Therefore, the battery package and the battery module according to the embodiment may include any components not shown in the drawings referred to. Furthermore, the dimensions of the components in the drawings do not need to faithfully represent the actual dimensions of the components and the dimensional ratios of each member. In this disclosure, pressure contact means contact with pressure. The rectangular shape is not limited to a strict rectangular shape, and includes a shape that can be visually recognized as a rectangular shape overall, even if the corners are curved. The ring shape includes not only a circular ring shape but also a rectangular ring shape. The upward direction is one direction in the thickness direction of the insulating substrate, and is a direction from the second surface side to the first surface side of the insulating substrate. The downward direction is the other direction in the thickness direction of the insulating substrate, and is a direction from the first surface side to the second surface side of the insulating substrate.

The battery package 1 and battery module 100 according to the first embodiment will be described with reference to Figs. 1 to 4. Fig. 1 is a schematic plan view showing the battery package 1 and battery module 100 according to the first embodiment. Fig. 1 shows a state in which the lid body 9 is removed, and the lid body 9 is indicated by a two-dot chain line in Fig. 1. Fig. 2 is a schematic cross-sectional view showing the battery package 1 and battery module 100 according to the first embodiment. Fig. 3 is a schematic plan view showing the battery package 1 and battery module 100 according to the first embodiment, with the metal frame omitted. Fig. 4 is a schematic cross-sectional view showing the battery package 1 and battery module 100 according to the first embodiment, with the metal frame omitted.

As shown in the example of Figs. 1 to 4, the battery module 100 according to the first embodiment includes the battery package 1 according to the first embodiment and a battery 200 mounted in the battery package 1. The battery package 1 may include an insulating substrate 2, and the planar shape of the insulating substrate 2 may be, for example, rectangular. The insulating substrate 2 is made of ceramics such as aluminum oxide sintered body (alumina ceramics), aluminum nitride sintered body, mullite sintered body, or glass ceramic sintered body. The insulating substrate 2 may have a plurality of stacked insulating layers or a single insulating layer. The planar shape of the insulating substrate 2 is not limited to a rectangular shape and can be changed as appropriate.

1 to 4, the insulating substrate 2 may have a first surface 2a, a second surface 2b located on the opposite side to the first surface 2a, and a plurality of side surfaces 2c located between the first surface 2a and the second surface 2b. The first surface 2a of the insulating substrate 2 may be a flat surface or may have irregularities. The second surface 2b of the insulating substrate 2 may be a flat surface or may have irregularities. The insulating substrate 2 may have a mounting portion 21 for mounting a battery 200 including two

electrode portions

201, 202 arranged along the first surface 2a, and the mounting portion 21 may be located on the first surface 2a side of the insulating substrate 2. The battery 200 may be a solid-state battery. Alternatively, the battery 200 may be an electronic component capable of supplying electricity, such as a capacitor. The planar shape of the mounting portion 21 of the insulating substrate 2 may be, for example, rectangular. The mounting portion 21 may be a portion that overlaps with the battery 200 when the battery module 100 is viewed in plan. The size of the mounting portion 21 of the insulating substrate 2 in a plan view may be slightly larger than the size of the battery 200 in a plan view.

As shown in the examples of Figures 1 to 4, the battery package 1 may include an insulating frame 3 as an example of a frame located so as to surround the mounting portion 21 on the first surface 2a of the insulating substrate 2. The insulating frame 3 may be made of ceramics and may be integrated with the insulating substrate 2. The insulating frame 3 may have multiple laminated insulating layers or a single insulating layer.

2 and 4, the battery package 1 may include a first external electrode 4 located on the second surface 2b of the insulating substrate 2. The first external electrode 4 may be located on one end side of the second surface 2b of the insulating substrate 2. The first external electrode 4 may be printed on the second surface 2b of the insulating substrate 2 and baked by firing. The first external electrode 4 may extend from the second surface 2b of the insulating substrate 2 to the side surface 2c (including the corner between the multiple side surfaces 2c). The first external electrode 4 may be electrically connectable to the first electrode of the mounting substrate via solder. The first external electrode 4 is made of a metal powder metallization containing tungsten (W), molybdenum (Mo), manganese (Mn), silver (Ag), copper (Cu), or the like as a component.

2 and 4, the battery package 1 may include a second external electrode 5 located on the second surface 2b of the insulating substrate 2. The second external electrode 5 may be located on the other end side of the second surface 2b of the insulating substrate 2. The second external electrode 5 may be printed on the second surface 2b of the insulating substrate 2 and baked by firing. The second external electrode 5 may extend from the second surface 2b of the insulating substrate 2 to the side surface 2c. The second external electrode 5 may be electrically connectable to the second electrode of the mounting substrate via solder. The second external electrode 5 is made of the same metal powder metallization as the first external electrode 4.

As in the examples shown in Figures 2 and 4, the battery package 1 may include a first electrode 6 located on one end side of the mounting portion 21 of the insulating substrate 2. The first electrode 6 may be printed on the mounting portion 21 of the insulating substrate 2 and baked by firing. The first electrode 6 can be electrically connected to one electrode portion 201 of the two

electrodes

201, 202 of the battery 200 mounted on the mounting portion 21 of the insulating substrate 2. The first electrode 6 may extend from the mounting portion 21 of the insulating substrate 2 to the boundary between the insulating substrate 2 and the insulating frame 3.

The first electrode 6 is electrically connected to the first external electrode 4 by a first connection wiring J1. The first connection wiring J1 may have a through conductor penetrating one or more insulating layers, and one or more wiring layers located between the insulating layers. The first electrode 6 and the first connection wiring J1 are made of the same metal powder metallization as the first external electrode 4, etc.

When the first electrode 6 extends to the boundary between the insulating substrate 2 and the insulating frame 3, the first electrode 6 is sandwiched between two insulating layers (insulating substrate 2 and insulating frame 3), and therefore the bonding strength between the first electrode 6 and the insulating substrate 2 is excellent. The through conductor of the first connection wiring J1 may penetrate from the mounting portion 21 of the insulating substrate 2 to the second surface 2b. In this case, the path from the battery 200 to the first external electrode 4 is short and has low resistance, so that the efficiency of extracting power from the battery 200 can be improved. In addition, the through conductor of the first connection wiring J1 may be positioned so as to overlap with the insulating frame 3 in a plan view (see FIG. 5). In this case, the strength of the battery package 1 can be improved even if the insulating substrate 2 is thin.

As in the examples shown in Figures 2 and 4, the battery package 1 may include a second electrode 7 located on the other end side of the mounting portion 21 of the insulating substrate 2. The second electrode 7 may be printed on the mounting portion 21 of the insulating substrate 2 and baked by firing. The second electrode 7 can be electrically connected to the other electrode portion 202 of the two

electrodes

201, 202 of the battery 200 mounted on the mounting portion 21 of the insulating substrate 2. The second electrode 7 may extend from the mounting portion 21 of the insulating substrate 2 to the boundary between the insulating substrate 2 and the insulating frame 3.

The second electrode 7 is electrically connected to the second external electrode 5 by the second connection wiring J2. The second connection wiring J2 may have a through conductor penetrating one or more insulating layers and one or more wiring layers located between the insulating layers. The second electrode 7 and the second connection wiring J2 are made of the same metal powder metallization as the first external electrode 4, etc.

When the second electrode 7 extends to the boundary between the insulating substrate 2 and the insulating frame 3, the second electrode 7 is sandwiched between two insulating layers (insulating substrate 2 and insulating frame 3), which provides superior bonding strength between the second electrode 7 and the insulating substrate 2. In addition, the second electrode 7 does not have to extend to the boundary between the insulating substrate 2 and the insulating frame 3.

The penetrating conductor of the second connection wiring J2 may penetrate from the mounting portion 21 of the insulating substrate 2 to the second surface 2b. In this case, the path from the battery 200 to the second external electrode 5 is short and has low resistance, thereby improving the efficiency of extracting power from the battery 200. In addition, the penetrating conductor of the second connection wiring J2 may be positioned so as to overlap with the insulating frame 3 in a plan view (see Figure 5). In this case, even if the insulating substrate 2 is thin, the strength of the battery package 1 can be improved.

As shown in the examples of Figs. 1 to 4, the battery package 1 may include a metal frame 8 as an example of an upper frame located on the upper surface side of the insulating frame 3. When the metal frame 8 and the insulating frame 3 are joined with a brazing material, a frame-shaped metal film F may be located on the upper surface of the insulating frame 3. The frame-shaped metal film F is made of the same metal powder metallization as the first external electrode 4, etc. As a constituent material of the metal frame 8, 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 battery package 1 may include a second insulating frame made of ceramic instead of the metal frame 8 as an upper frame located on the upper surface side of the insulating frame 3.

As shown in the example of Figures 3 and 4, the battery package 1 may omit the metal frame 8 from its components. In this case, the battery package 1 and the battery module 100 can be made thinner while reducing the material costs and assembly costs of the battery package 1.

As in the example shown in Figures 1 to 4, when the insulating substrate 2 and insulating frame 3 are made of, for example, an aluminum oxide sintered body, the insulating substrate 2 and insulating frame 3 are manufactured as follows. A slurry is produced by adding and mixing an appropriate organic binder and solvent to raw material powders such as aluminum oxide and silicon oxide. This slurry is formed into a sheet shape by a doctor blade method or a calendar roll method to produce a ceramic green sheet for the insulating layer. Furthermore, the ceramic green sheet for the insulating layer is subjected to an appropriate punching process to form holes such as the storage space 3s of the insulating frame 3. Then, multiple ceramic green sheets for the insulating layer are stacked to produce a laminate. The laminate is then fired at a high temperature (approximately 1300 to 1600°C) to produce the insulating substrate 2 and insulating frame 3.

When the first external electrode 4, the second external electrode 5, the first electrode 6, the first connection wiring J1, the second electrode 7, the second connection wiring J2, and the frame-shaped metal film F are, for example, tungsten metallization layers, they can be formed as follows. The first external electrode 4, the second external electrode 5, the first electrode 6, the wiring layer of the first connection wiring J1, the second electrode 7, the wiring layer of the second connection wiring J, and the frame-shaped metal film F are formed by printing a metal paste made by mixing tungsten powder with an organic solvent and an organic binder at a predetermined position on the ceramic green sheet for the insulating layer by a method such as screen printing, and firing the laminate. The through conductors of the first connection wiring J1 and the through conductors of the second connection wiring J2 are formed by providing holes for the through conductors at predetermined positions on the ceramic green sheet for the insulating layer and filling the holes for the through conductors with metal paste.

The surfaces of the first external electrode 4, the second external electrode 5, the first electrode 6, the first connection wiring J1, the second electrode 7, the second connection wiring J2, and the frame-shaped metal film F that are exposed to the outside may be coated with a nickel plating layer/gold plating layer as a metal plating layer by a plating method such as electrolytic plating or electroless plating. This can effectively reduce corrosion of the first external electrode 4 and the second external electrode 5, etc. The metal plating layer is not limited to a nickel plating layer/gold plating layer, and may be other metal plating layers including a nickel plating layer/palladium plating layer/gold plating layer, etc.

As in the examples shown in Figures 2 and 4, the battery package 1 may include a flat lid 9 that covers the opening (opening side) of the metal frame 8. The lid 9 may cover the opening (opening side) of the insulating frame 3, or may cover the battery 200. The lid 9 may be joined to the metal frame 8 or the insulating frame 3. The lid 9 may be located on the first surface 2a side of the insulating substrate 2 via the insulating frame 3 or the like. The lid 9 may be electrically insulated from the first electrode 6 and the second electrode 7.

2 and 4, the battery package 1 may include a lid located on the first surface 2a side of the insulating substrate 2 and covering the battery 200. The lid 9 may be electrically insulated from the first electrode 6 and the second electrode 7. The lid 9 may cover the opening (opening side) of the insulating frame 3 on the first surface 2a of the insulating substrate 2 as in the example shown in FIG. 4. The lid 9 may cover the opening (opening side) of the metal frame 8 on the insulating frame 3 as in the example shown in FIG. 2. The lid 9 that covers the opening (opening side) of the insulating frame 3 or the metal frame 8 may be flat. The lid 9 may be joined to the frame-shaped metal film F on the metal frame 8 or the insulating frame 3.

The shape of the lid body 9 in a plan view may be, for example, rectangular. The lid body 9 is made of, for example, ceramics or metal. The material constituting the lid body 9 may be one that has a small difference in thermal expansion with ceramics, such as an iron-nickel (Fe-Ni) alloy or an iron-nickel-cobalt (Fe-Ni-Co) alloy. As long as the lid body 9 can close the opening of the insulating frame 3 (metal frame 8), the shape of the lid body 9 in a plan view may be a shape other than rectangular.

The lid body 9 and the metal frame 8 may be joined using a joining material such as a brazing material. The lid body 9 and the metal frame 8 may be joined using glass or a brazing material as a joining material to increase the airtightness of the battery module 100. When the lid body 9 made of ceramics and the metal frame 8 are joined using a brazing material, a metal film having the same configuration as the frame-shaped metal film F may also be located on the underside of the lid body 9.

The metal lid 9 and metal frame 8 may be joined by welding, such as seam welding or laser welding, to improve the airtight sealing of the battery module 100. If the metal frame 8 is omitted from the configuration of the battery package 1, the metal lid 9 may be joined to the frame-shaped metal film F by welding, such as direct seam welding, laser welding, or electron beam welding, solder joining, or brazing. Joining using seam welding, direct seam welding, laser welding, or electron beam welding is joining by localized heating of the joint, so the thermal effect on the battery 200 is smaller than when brazing is used, which is joining by total heating (reflow heating).

When the lid body 9 is made of ceramic, the lid body 9 and the insulating frame body 3 can be joined by soldering, brazing, frit glass, or resin. In the case of soldering or brazing, a frame-shaped metal film F is disposed on the insulating frame body 3.

The battery module 100 may be hermetically sealed under a low dew point, such as in a nitrogen atmosphere, an argon atmosphere, or a vacuum atmosphere. In this way, by hermetically sealing the battery module 100, it is possible to reduce the risk of moisture, oxygen, etc., which deteriorate the battery material of the battery 200, entering the storage space 3s from outside the battery package 1. By hermetically sealing the battery module 100 in a nitrogen atmosphere, an argon atmosphere, or a vacuum atmosphere, it is possible to remove moisture and oxygen, which deteriorate the battery material of the battery 200, from the storage space 3s of the battery package 1 to the maximum extent possible.

In particular, when the operating temperature of the battery 200 is −20° C. to 100° C., the battery module 100 may be hermetically sealed in a vacuum atmosphere of 10 Pa or less. When the operating temperature of the battery 200 is −50° C. to 120° C., the battery module 100 may be hermetically sealed in a vacuum atmosphere of 1 Pa or less, or in a high vacuum of 10 ⁻¹ to 10 ⁻⁵ . By increasing the degree of vacuum and sealing, the moisture present in the package can be minimized, and at the same time, the occurrence of condensation inside the package can be reduced even if a temperature change occurs in the sealed battery 200. As a result, not only is adhesion of moisture to the elastic member reduced and deterioration suppressed, but deterioration of battery performance caused by the reaction of moisture (especially hydrogen ions) with the battery material (Li ions, etc.) can be reduced.

If the battery module 100 cannot be hermetically sealed in a vacuum atmosphere, it may be hermetically sealed in a nitrogen or argon atmosphere with a dew point of -40°C or less, and the nitrogen or argon gas atmosphere should have a dew point of -40°C or less. Since a nitrogen or argon atmosphere with a dew point of -40°C is equivalent to a vacuum atmosphere of about 10 Pa, even in this case, the risk of moisture adhering to the battery 200 or elastic member due to condensation or the like can be reduced, and the durability of the battery module 100 can be increased.

Also, before sealing the battery module 100, moisture inside the battery package 1 may be evaporated by pre-baking (heating). The pre-baking temperature may be equal to or higher than the temperature of the overall heating (reflow heating). In this way, by hermetically sealing after pre-baking, gases trapped in the walls of the storage space 3s of the battery package 1 can be released in advance, reducing moisture, oxygen, etc. present in the storage space 3s of the battery package 1 after hermetic sealing.

Furthermore, the internal space of the battery package 1 may be pre-baked at a reduced pressure below atmospheric pressure. This lowers the boiling point of water, allowing water to evaporate at a lower temperature than under atmospheric pressure. This reduces the effect of heat on the battery 200, and reduces the risk of deterioration of the battery material of the battery 200.

As shown in the examples of Figures 1 to 4, the battery package 1 may include a coil spring 10 as an example of a pressing member that presses the insulating portion 203 of the battery 200 toward the mounting portion 21 of the insulating substrate 2 with a downward elastic force (spring force). The coil spring 10 is an example of a metal spring that presses the insulating portion 203 of the battery 200 toward the mounting portion 21 of the insulating substrate 2, and is an example of an elastic member. The insulating portion 203 of the battery 200 is a portion between the two

electrode portions

201, 202 of the battery 200. The coil spring is shown as an example of an elastic material, and any material or shape may be used as long as the material is an elastic material, such as a leaf spring or sponge.

The coil spring 10 as an example of an elastic member may be located between the lid body 9 and the insulating part 203 of the battery 200. The coil spring 10 as an example of an elastic member may be pressed from above by the lid body 9. The upper end of the coil spring 10 as an example of an elastic member may be pressed against the back surface of the lid body 9. The upper end of the coil spring 10 as an example of an elastic member may be joined to the back surface of the lid body 9. A part of the lid body 9 may be an elastic member that presses the insulating part 203 of the battery 200 toward the mounting part 21 of the insulating substrate 2. The movable range (expansion range) of the coil spring 10 as an example of an elastic member may be 20% or more of the height (vertical dimension) of the coil spring 10 before elastic deformation so as to absorb manufacturing errors in the thickness of the battery 200 and the insulating frame body 3. The coil spring 10 may press the center of the battery 200 in a plan view. This allows the battery 200 to be fixed more stably.

As shown in the example of Figs. 1 to 4, the battery module 100 according to the first embodiment includes the battery package 1 according to the first embodiment and a battery 200 mounted on the mounting portion 21 of the insulating substrate 2 of the battery package 1. The battery 200 may be accommodated in the accommodation space 3s of the insulating frame 3. One electrode portion 201 of the battery 200 may be electrically connected to the first electrode 6. The other electrode portion 202 of the battery 200 may be electrically connected to the second electrode 7. Since the first external electrode 4 and the second external electrode 5 are located on the second surface 2b of the insulating substrate 2, the battery package 1 and the battery module 100 can be surface mounted on a mounting substrate.

In the example of the first embodiment, the cover 9 covers the opening side of the insulating frame 3, and the coil spring 10 presses the insulating portion 203 of the battery 200 toward the mounting portion 21 of the insulating substrate 2 with the downward elastic force, thereby mechanically fixing the battery 200 to the insulating substrate 2. Therefore, even if the battery module 100 is used for a long period of time, the risk of a decrease in the bonding strength of the battery 200 to the insulating substrate 2 can be reduced. As a result, according to the example of the first embodiment, the battery 200 is less likely to peel off from the insulating substrate 2, and the connection reliability of the battery 200 and the long-term reliability of the battery module 100 can be improved (effect (1)).

The lid 9 is also electrically insulated from the first electrode 6 and the second electrode 7. Therefore, according to the example of the first embodiment, the risk of a short circuit between the lid 9 and other components is reduced, and power can be efficiently extracted from the battery 200 without discharging from the lid 9 to the outside (effect (2)).

When the battery package 1 includes an insulating frame 3 having a storage space 3s, the battery package 1 becomes robust against external impacts, and the connection reliability of the battery 200 and the long-term reliability of the battery module 100 can be improved. In particular, when there is an internal space (gap) between the back surface of the lid 9 and the battery 200, the stress of the coil spring 10 can be alleviated even if the battery 200 expands (effect (3)). The depth of the storage space 3s shown in FIG. 2 is shallower than the thickness (height) of the battery 200. The depth of the storage space 3s shown in FIG. 4 is deeper than the thickness of the battery 200. As in the example shown in FIG. 4, if the depth of the storage space 3s is deeper than the thickness of the battery 200, the possibility of a short circuit between the

electrode parts

201, 202 of the battery 200 and the lid 9 via the frame-shaped metal film F and the metal frame 8 is reduced when the position of the battery 200 is shifted.

With reference to Figures 5 to 10, a battery package 1 and a battery module according to another aspect of the first embodiment will be described. Figures 5 to 10 are schematic cross-sectional views showing a battery package 1 and a battery module 100 according to another aspect of the first embodiment.

As in the examples shown in Figs. 5 to 7, the battery package 1 may include a first support member 11 that supports one electrode portion 201 of the two

electrode portions

201, 202 of the battery 200 from below. The first support member 11 may be located on one end side of the mounting portion 21 of the insulating substrate 2. The first support member 11 may be electrically connected to the first electrode 6. The first support member 11 may be elastically deformable in the vertical direction.

The battery package 1 may include a second support member 12 that supports the other electrode portion 202 of the two

electrode portions

201, 202 of the battery 200 from below. The second support member 12 may be located on the other end side of the mounting portion 21 of the insulating substrate 2. The second support member 12 may be electrically connected to the second electrode 7. The second support member 12 may be elastically deformable in the vertical direction.

As shown in the example of FIG. 5, the first support member 11 and the second support member 12 may each be a leaf spring. As shown in the example of FIG. 6, the first support member 11 and the second support member 12 may each be a coil spring. As shown in the example of FIG. 7, the first support member 11 and the second support member 12 may each be an elastic conductive sheet, rubber, or sponge (such as graphene meso sponge) as long as the material is a conductive material.

When the battery package 1 includes the first support member 11 and the second support member 12, even if the insulating substrate 2 is warped in an upwardly convex manner, the first support member 11 and the second support member 12 can elastically deform in response to the warping of the insulating substrate 2, and absorb the warping of the insulating substrate 2. Therefore, according to another example of the first embodiment, the connection state between one electrode portion 201 of the battery 200 and the first electrode 6, and the connection state between the other electrode portion 202 of the battery 200 and the second electrode 7 can be made more stable, and the connection reliability of the battery 200 can be further improved.

Also, as in the example shown in FIG. 5, even when there is a metal frame 8, the storage space 3s may be made deeper as in FIG. 4. For example, the depth of the storage space 3s may be such that the battery 200 is below the opening of the insulating frame 3 when the coil spring 10, the first support member 11, and the second support member 12 are in a compressed state due to sealing with the lid 9. This reduces the possibility of a short circuit between the

electrodes

201, 202 of the battery 200 and the lid 9 via the frame-shaped metal film F and the metal frame 8.

Alternatively, as shown in the example in FIG. 6, the frame-shaped metal film F may be disposed at a position away from the opening of the storage space 3s. This reduces the possibility of a short circuit between the

electrode parts

201, 202 and the lid 9 even if the

electrode parts

201, 202 of the battery 200 protrude from the opening.

As shown in the examples of Figures 6 and 7, the insulating substrate 2 may have a partition portion 22 that separates the accommodation space 3s of the insulating frame 3 into a first accommodation area for accommodating the first support member 11 and a second accommodation area for accommodating the second support member 12. The partition portion 22 of the insulating substrate 2 may be located in the center of the mounting portion 21.

When the insulating substrate 2 has the partition portion 22, it is possible to reduce the positional deviation of the first support member 11 relative to the first surface 2a of the insulating substrate 2, and the positional deviation relative to the first surface 2a of the insulating substrate 2. Therefore, according to another example of the first embodiment, the first support member 11 and the second support member 12 can stably support the two

electrode portions

201, 202 of the battery 200.

As shown in the example in FIG. 8, the first electrode 6 may have a first bump 61 that contacts one electrode portion 201 of the pair of

electrode portions

201, 202 of the battery 200. The second electrode 7 may have a second bump 71 that contacts the other electrode portion 202 of the pair of

electrode portions

201, 202 of the battery 200. The first bump 61 and the second bump 71 are made of the same metal powder metallization as the first external electrode 4, etc., and can be easily formed by metallization printing. The thickness (height) of the first bump 61 and the second bump 71 is about 10 μm to 100 μm.

When the first electrode 6 has a first bump 61 and the second electrode 7 has a second bump 71, even if the insulating substrate 2 is warped in an upwardly convex manner, the connection state between one electrode portion 201 of the battery 200 and the first electrode 6, and the connection state between the other electrode portion 202 of the battery 200 and the second electrode 7 can be stabilized. Therefore, according to another example of the first embodiment, the connection reliability of the battery 200 can be further improved.

9 and 10, the insulating substrate 2 may have a recess 23 opening on the first surface 3a. The recess 23 of the insulating substrate 2 may be located between the first electrode 6 and the second electrode 7. Also, as shown in the example of FIG. 10, the battery package 1 may include a support member 13 that supports the insulating portion 203 of the battery 200 from below. The support member 13 may be located within the recess 23 of the insulating substrate 2. The support member 13 may be bonded to the bottom surface of the recess 23 of the insulating substrate 2. The support member 13 may be elastically deformable in the vertical direction. As shown in the example of FIG. 10, the support member 13 may be a leaf spring. The support member 13 may be an elastic member other than a leaf spring, such as a coil spring or rubber.

When the recess 23 of the insulating substrate 2 is located between the first electrode 6 and the second electrode 7, even if the insulating substrate 2 is warped in an upwardly convex manner, the battery 200 can be easily mounted on the mounting portion 21 of the insulating substrate 2. As a result, according to another example of the first embodiment, the assembly of the battery module 100 can be improved.

When the battery package 1 includes the support member 13, the elastic deformation of the support member 13 can reduce the impact on the battery 200 when the battery 200 is mounted on the mounting portion 21 of the insulating substrate 2. This can further improve the ease of assembly of the battery module 100 according to another example of the first embodiment.

Second Embodiment
A battery package 1A and a battery module 100A according to the second embodiment will be described with reference to Figs. 11 to 14. Fig. 11 is a schematic plan view showing the battery package 1A and the battery module 100A according to the second embodiment. Fig. 12 is a schematic cross-sectional view taken along line XII-XII in Fig. 11. Fig. 13 is a schematic plan view showing the battery package 1A and the battery module 100A according to the second embodiment in which the arrangement of the leaf springs 14 is changed. Fig. 14 is a schematic cross-sectional view taken along line XIV-XIV in Fig. 13. Figs. 11 and 13 show a state in which the lid body 9 is removed, and the lid body 9 is indicated by a two-dot chain line in Figs. 11 and 13.

As shown in the example of Figures 11 to 14, the battery module 100A according to the second embodiment includes a battery package 1A according to the second embodiment and a battery 200 mounted in the battery package 1. The battery package 1A according to the second embodiment has the same configuration as the battery package 1 according to the first embodiment, except for some configuration. Among the configurations of the battery package 1A according to the second embodiment, those that differ from the battery package 1 according to the first embodiment will be described. For ease of explanation, the same reference numerals will be used to denote components that have the same functions as the components described in the first embodiment.

As in the examples shown in Figures 11 to 14, the battery package 1A may include a leaf spring 14 as an example of a pressing member that presses the insulating portion 203 of the battery 200 toward the mounting portion 21 of the insulating substrate 2 with a downward elastic force (spring force). The leaf spring 14 is an example of a metal spring that presses the insulating portion 203 of the battery 200 toward the mounting portion 21 of the insulating substrate 2, and is an example of an elastic member.

The leaf spring 14 may be located on the opening side of the storage space 3s of the insulating frame 3 inside the metal frame 8. The leaf spring 14 may have a pressure contact portion 14a located in its center and pressed against the insulating portion 203 of the battery 200. The leaf spring 14 may have a curved portion 14b located between its center and an end portion and curved in a convex shape toward the upward direction. The curved portion 14b of the leaf spring 14 may be pressed from above by the lid 9. The end side of the leaf spring 14 may be located inside the metal frame 8 on the upper surface of the insulating frame 3.

In order to absorb manufacturing errors in the thickness of the battery 200 and the insulating frame 3, the movable range (stretching range) of the leaf spring 14, which is an example of an elastic member, may be 20% or more of the height (vertical dimension) of the leaf spring 14 before elastic deformation. The height of the leaf spring 14 before elastic deformation may be approximately 0.1 mm to 1.0 mm.

11 and 12, the leaf spring 14 may be arranged inside the metal frame 8 along the arrangement direction of the two

electrode parts

201, 202 of the battery 200. As shown in the example of FIG. 11, the leaf spring 14 may be arranged so as to overlap the two

electrode parts

201, 202 and the insulating part 203 of the battery 200 in a plan view. As shown in the example of FIG. 13 and 14, the leaf spring 14 may be arranged in a direction perpendicular to the arrangement direction of the two

electrode parts

201, 202 of the battery 200 inside the metal frame 8. As shown in the example of FIG. 13, the leaf spring 14 may be arranged so as to be located between the two

electrode parts

201, 202 of the battery 200 and overlap the insulating part 203 of the battery 200 in a plan view.

The leaf spring 14 may be a non-conductive elastic member. The leaf spring 14 may be made of non-conductive ceramics or plastic, in which case there will be no short circuit between the lid body 9 and the battery 200. In particular, if the leaf spring 14 is made of non-conductive ceramics, the heat resistance of the leaf spring 14 is high, and the long-term reliability of the battery module 100A can be improved.

As shown in the examples of Figs. 11 to 14, the battery module 100A according to the second embodiment includes the battery package 1A according to the second embodiment and a battery 200 mounted on the mounting portion 21 of the insulating substrate 2 of the battery package 1A. The battery 200 may be accommodated in the accommodation space 3s of the insulating frame 3. One electrode portion 201 of the battery 200 may be electrically connected to the first electrode 6. The other electrode portion 202 of the battery 200 may be electrically connected to the second electrode 7. Since the first external electrode 4 and the second external electrode 5 are located on the second surface 2b of the insulating substrate 2, the battery package 1A and the battery module 100A can be surface mounted on a mounting substrate.

In the example of the second embodiment, the cover 9 covers the opening side of the insulating frame 3, and the downward elastic force of the leaf spring 14 presses the insulating portion 203 of the battery 200 against the mounting portion 21 of the insulating substrate 2, mechanically fixing the battery 200 to the insulating substrate 2. This reduces the risk of a decrease in the bonding strength of the battery 200 to the insulating substrate 2 even if the battery module 100 is used for a long period of time. As a result, in the example of the second embodiment, the battery 200 is less likely to peel off from the insulating substrate 2, and the connection reliability of the battery 200 and the long-term reliability of the battery module 100A can be improved.

When the leaf spring 14 has a pressure contact portion 14a and a curved portion 14b, the pressure contact portion 14a of the leaf spring 14 is in pressure contact with the insulating portion 203 of the battery 200 with the end side of the leaf spring 14 in contact with the upper surface of the insulating frame body 3 and the curved portion 14b of the leaf spring 14 pressed against the lid body 9. This allows the elastic force of the leaf spring 14 to be effectively exerted, stabilizing the fixed state of the battery 200 relative to the insulating substrate 2. As a result, according to the example of the second embodiment, the connection reliability of the battery 200 and the long-term reliability of the battery module 100A can be further improved.

In addition, the second embodiment also provides the same effects as those (2) and (3) described above.

With reference to Figures 15 to 21, a battery package 1A and a battery module 100A according to another aspect of the second embodiment will be described. Figures 15 to 21 are schematic cross-sectional views showing a battery package 1A and a battery module 100A according to another aspect of the second embodiment.

15 and 16, the insulating frame 3 may have a recessed step 31 on its opening side. The end side of the leaf spring 14 may contact the bottom surface 31a of the recessed step 31 of the insulating frame 3. The recessed step 31 of the insulating frame 3 may be annular. The recessed step 31 of the insulating frame 3 may be located on two opposing sides of the four sides of the opening side of the insulating frame 3 that contact the end side of the leaf spring 14. The recessed step 31 of the insulating frame 3 does not have to be located over the entire side of the opening side of the insulating frame 3 as long as it has a width that can accommodate the end side of the leaf spring 14. Also, as in the example shown in FIG. 16, the end side of the leaf spring 14 may be bent in an arc shape and may be located from the bottom surface 31a to the inner surface 31i of the recessed step 31 of the insulating frame 3.

When the end side of the leaf spring 14 contacts the recessed step 31 of the insulating frame 3, the movement of the end side of the leaf spring 14 is restricted by the recessed step 31 of the insulating frame 3, allowing the elastic force of the leaf spring 14 to be fully exerted, making the fixed state of the battery 200 relative to the insulating substrate 2 more stable. As a result, according to another example of the second embodiment, the connection reliability of the battery 200 and the long-term reliability of the battery module 100A can be further improved.

When the end of the leaf spring 14 is bent into an arc, the end of the leaf spring 14 can be positioned inside the metal frame 8 without getting caught on the edge of the opening side of the storage space 3s of the insulating frame 3. This makes it possible to improve the assembly of the battery module 100A, according to another example of the second embodiment.

As shown in the example in FIG. 17, the curved portion 14b of the leaf spring 14 may contact the back surface of the metal lid body 9 via an insulating sheet IS as an example of an insulating material. A part or all of the surface of the leaf spring 14 may be coated with an insulating material. An insulating material may be disposed between the leaf spring 14 and the battery 200. In these cases, the leaf spring 14 and the lid body 9 can be electrically insulated. Therefore, according to another aspect of the second embodiment, even if the pressure contact portion 14a of the leaf spring 14 is short-circuited to either of the two

electrodes

201, 202 of the battery 200, the power from the battery 200 can be efficiently extracted without discharging to the outside from the lid body 9.

As shown in the example of FIG. 18, instead of the leaf spring 14 having the curved portion 14b, the leaf spring 14 may exert a downward elastic force (spring force) by having both ends thereof engaged with a part of the metal frame 8 from below. Instead of having both ends of the leaf spring 14 engaged with a part of the metal frame 8 from below, the leaf spring 14 may be engaged with a part of the insulating frame 3 from below. With this configuration, the battery 200 can be fixed by the leaf spring 14 before the lid body 9 is joined, so that the fixation of the battery 200 by the leaf spring 14 can be confirmed before the lid body 9 is joined. Also, an insulating member may be disposed between the leaf spring 14 and the metal frame 8. A part or all of the surface of the leaf spring 14 may be coated with an insulating member. An insulating member may be disposed between the leaf spring 14 and the battery 200.

In these cases, both ends of the leaf spring 14 are engaged from below with a part of the metal frame 8 or a part of the insulating frame 3, so that the pressure contact portion 14a of the leaf spring 14 is pressed against the insulating portion 203 of the battery 200. This allows the elastic force of the leaf spring 14 to be effectively exerted, stabilizing the fixed state of the battery 200 relative to the insulating substrate 2. As a result, according to the example of the second embodiment, the connection reliability of the battery 200 and the long-term reliability of the battery module 100A can be further improved.

As shown in the example of FIG. 19, instead of the leaf spring 14 having the curved portion 14b, the end side of the leaf spring 14 may be bent into a horizontal U-shape. The end side of the leaf spring 14 may be located on the upper surface of the insulating frame body 3. The end side of the leaf spring 14 may be pressed from above by the cover body 9.

When the end of the leaf spring 14 is bent into a horizontal U-shape, the pressure contact portion 14a of the leaf spring 14 is pressed against the insulating portion 203 of the battery 200 while the end of the leaf spring 14 is pressed by the cover 9. This allows the elastic force of the leaf spring 14 to be effectively exerted, stabilizing the fixed state of the battery 200 relative to the insulating substrate 2. As a result, according to the example of the second embodiment, the connection reliability of the battery 200 and the long-term reliability of the battery module 100A can be further improved.

As shown in the example of FIG. 20, instead of the leaf spring 14 having a curved portion 14b, the end side of the leaf spring 14 may be pressed from above by the lid 9 via an insulating ring IR, which is an example of an insulating member.

In this case, the end side of the leaf spring 14 is pressed by the cover 9 via the insulating ring IR, and the pressure contact portion 14a of the leaf spring 14 is pressed against the insulating portion 203 of the battery 200. This allows the elastic force of the leaf spring 14 to be effectively exerted, stabilizing the fixed state of the battery 200 relative to the insulating substrate 2. As a result, according to the example of the second embodiment, the connection reliability of the battery 200 and the long-term reliability of the battery module 100A can be further improved. Furthermore, as shown in FIG. 20, a notch may be formed in the lower surface of the insulating ring IR to limit lateral displacement of the leaf spring 14.

As shown in the example of FIG. 21, instead of the leaf spring 14 having a curved portion 14b, the end side of the leaf spring 14 may be pressed from above by the lid body 9. The end side of the leaf spring 14 may be joined to the back surface of the lid body 9.

When the end of the leaf spring 14 is joined to the back surface of the lid body 9, it is possible to eliminate misalignment of the leaf spring 14 relative to the lid body 9. This makes it possible to effectively exert the elastic force of the leaf spring 14, stabilizing the fixed state of the battery 200 relative to the insulating substrate 2 and reducing the risk of electrical conduction between the

electrodes

201, 202 of the battery 200 and the lid body 9. As a result, according to the example of the second embodiment, it is possible to further improve the connection reliability of the battery 200 and the long-term reliability of the battery module 100A. Alternatively, a protrusion that limits the lateral movement of the leaf spring 14 may be provided on the back surface of the lid body 9.

　In addition, the configurations shown in Figures 5 to 10 described above may also be applied to the battery package 1A according to the second embodiment.

The sealing method for the battery module according to the second embodiment will be described with reference to FIG. 22. FIG. 22 is a schematic cross-sectional view for explaining the sealing method for the battery module according to another aspect of the second embodiment.

As shown in the example of FIG. 22, the method for sealing the battery module according to the second embodiment is a method for sealing the battery module 100A, in which the battery module 100A is sealed while a metal lid 9 presses a leaf spring 14, an example of a pressing member, arranged on the upper surface side of the battery 200 from above. The specific details of the method for sealing the battery module 100A according to the second embodiment are as follows.

First, an example of seam welding sealing is shown. The leaf spring 14 is placed on the upper side of the battery 200 (the opening side of the insulating frame 3) so that the pressure contact portion 14a of the leaf spring 14 contacts the insulating portion 203 of the battery 200 and both ends of the leaf spring 14 contact the upper surface of the insulating frame 3. Next, the battery package 1A is placed in a chamber filled with an inert gas such as nitrogen or argon using a baking device and pre-baked at a temperature of 100°C or higher to evaporate the moisture inside the battery package 1A. The battery package 1A may be pre-baked with the internal space of the battery package 1A reduced to a pressure lower than atmospheric pressure.

Then, in a nitrogen atmosphere or argon atmosphere with a dew point of -40°C or less, the metal lid body 9 is brought into contact with the curved portion 14b of the leaf spring 14, and the lid body 9 is pressed downward by the pusher PP, so that the leaf spring 14 is pressed from above by the lid body 9 with the back surface of the lid body 9 in contact with the upper surface of the metal frame 8. Then, with the leaf spring 14 pressed by the lid body 9, spot welding is performed on a portion of the peripheral portion of the lid body 9 using the roller electrode RE, thereby joining the portion of the peripheral portion of the lid body 9 to the upper surface of the metal frame 8. Furthermore, seam welding is performed around the entire circumference of the peripheral portion of the lid body 9 using the roller electrode RE, thereby joining the entire circumference of the peripheral portion of the lid body 9 to the upper surface of the metal frame 8. This allows the battery module 100A to be sealed while the lid body 9 is pressed by the leaf spring 14. Instead of sealing the battery module 100A in a nitrogen or argon atmosphere with a dew point of -40°C or less, the battery module 100A may be sealed in a vacuum atmosphere of 10 Pa or less.

The above is an example of a sealing method for the structure shown in Figure 22, but even in other structures or other sealing forms, the battery module 100A can be hermetically sealed by pressing the leaf spring 14, which is an example of an elastic member, with the lid body 9.

In the battery module sealing method according to the second embodiment, the battery module 100A is sealed while the leaf spring 14 is pressed from above by the lid 9, so the battery module 100A can be easily sealed while maintaining the airtightness of the battery module 100A, improving the assembly of the battery module 100A.

The battery module sealing method according to the second embodiment may be applied to sealing not only the battery module 100A, but also the battery module 100 described above and the battery module 100B (100C, 100D) described below.

Third Embodiment
A battery package 1B and a battery module 100B according to a third embodiment will be described with reference to Fig. 23 and Fig. 24. Fig. 23 is a schematic plan view showing a battery package 1B and a battery module 100B according to a third embodiment. Fig. 23 shows a state in which a lid body 9 has been removed, and the lid body 9 is indicated by a two-dot chain line in Fig. 23. Fig. 24 is a schematic cross-sectional view taken along line XXIV-XXIV in Fig. 23.

As shown in the example of Figures 23 and 24, the battery module 100B according to the third embodiment includes a battery package 1B according to the third embodiment and a battery 200 mounted in the battery package 1B. The battery package 1B according to the third embodiment has the same configuration as the battery package 1 according to the first embodiment, except for some configuration. Among the configurations of the battery package 1B according to the third embodiment, those that differ from the battery package 1 according to the first embodiment will be described. For ease of explanation, the same reference numerals will be used to denote components that have the same functions as the components described in the first embodiment.

As shown in the examples of Figures 23 and 24, the battery package 1B may include a rubber plate 15 as an example of a pressing member that presses the insulating portion 203 of the battery 200 toward the mounting portion 21 of the insulating substrate 2 by a downward elastic force (spring force). The rubber plate 15 may be located on the back side of the lid body 9. The rubber plate 15 may be joined to the back side of the lid body 9. The rubber plate 15 may be sandwiched between the back side of the lid body 9 and the insulating portion 203 of the battery 200. The rubber plate 15 may be porous and non-conductive.

23 and 24, the battery module 100B according to the third embodiment includes the battery package 1B according to the third embodiment and a battery 200 mounted on the mounting portion 21 of the insulating substrate 2 of the battery package 1B. The battery 200 may be accommodated in the accommodation space 3s of the insulating frame 3. One electrode portion 201 of the battery 200 may be electrically connected to the first electrode 6. The other electrode portion 202 of the battery 200 may be electrically connected to the second electrode 7. Since the first external electrode 4 and the second external electrode 5 are located on the second surface 2b of the insulating substrate 2, the battery package 1B and the battery module 100B can be surface mounted on a mounting substrate.

In the example of the third embodiment, the cover 9 covers the opening side of the insulating frame 3, and the rubber plate 15 presses the insulating portion 203 of the battery 200 toward the mounting portion 21 of the insulating substrate 2 with its downward elastic force, thereby mechanically fixing the battery 200 to the insulating substrate 2. Therefore, even if the battery module 100B is used for a long period of time, the risk of a decrease in the bonding strength of the battery 200 to the insulating substrate 2 can be reduced. As a result, according to the example of the third embodiment, the battery 200 is less likely to peel off from the insulating substrate 2, and the connection reliability of the battery 200 and the long-term reliability of the battery module 100B can be improved.

In addition, the third embodiment also provides the same effects as those (2) and (3) described above.

Fourth Embodiment
A battery package 1B and a battery module 100B according to a third embodiment will be described with reference to Fig. 25 and Fig. 26. Fig. 25 is a schematic plan view showing a battery package 1C and a battery module 100C according to a fourth embodiment. Fig. 25 shows a state in which a lid body 9 has been removed, and the lid body 9 is indicated by a two-dot chain line in Fig. 25. Fig. 26 is a schematic cross-sectional view taken along line XXV-XXV in Fig. 25.

As shown in the example of Figures 25 and 26, the battery module 100C according to the fourth embodiment includes a battery package 1C according to the fourth embodiment and a battery 200 mounted in the battery package 1C. The battery package 1C according to the fourth embodiment has the same configuration as the battery package 1 according to the first embodiment, except for some configuration. Among the configurations of the battery package 1C according to the fourth embodiment, those that differ from the battery package 1 according to the first embodiment will be described. For ease of explanation, the same reference numerals will be used to denote components that have the same functions as the components described in the first embodiment.

25 and 26, the lid body 9 may have a protrusion 91 protruding downward. The protrusion 91 of the lid body 9 may press the insulating part 203 of the battery 200 toward the mounting part 21 of the insulating substrate 2 by a downward elastic force. In other words, the protrusion 91 of the lid body 9 may correspond to a pressing member that presses the insulating part 203 of the battery 200 toward the mounting part 21 of the insulating substrate 2 by a downward elastic force. The protrusion 91 may be located in the center of the lid body 9. The protrusion 91 may be a curved part in which a part of the flat lid body 9 is curved downward. The protrusion 91 may be a thick part in which a part of the lid body 9 is thickened. The protrusion 91 may be a protrusion joined to the back surface of the lid body 9.

As shown in the example of FIG. 26, the protrusion 91 of the lid 9 may be inverted upside down to press the battery 200 from above toward the mounting portion 21 of the insulating substrate 2. Specifically, after the lid 9 is joined, the protrusion 91 protruding upward may be inverted downward, and the inverted protrusion 91 may press the battery 200 from above toward the mounting portion 21 of the insulating substrate 2. In FIG. 26, the protrusion 91 of the lid 9 before inversion is shown by a two-dot chain line. The internal space of the battery package 1C including the storage space 3s may be sealed in a state where the pressure is reduced below atmospheric pressure so that the protrusion 91 of the lid 9 can be easily inverted upside down. The lid 9 having the protrusion 91 may be made by punching a metal plate. The lid 9 having the protrusion 91 may be made by punching a metal plate and pressing it.

25 and 26, the battery module 100C according to the fourth embodiment includes the battery package 1C according to the fourth embodiment and a battery 200 mounted on the mounting portion 21 of the insulating substrate 2 of the battery package 1C. The battery 200 may be accommodated in the accommodation space 3s of the insulating frame 3. One electrode portion 201 of the battery 200 may be electrically connected to the first electrode 6. The other electrode portion 202 of the battery 200 may be electrically connected to the second electrode 7. Since the first external electrode 4 and the second external electrode 5 are located on the second surface 2b of the insulating substrate 2, the battery package 1C and the battery module 100C can be surface mounted on a mounting substrate.

According to the fourth embodiment, the cover 9 closes the opening side of the insulating frame 3, and the protrusion 91 of the cover 9 is inverted up and down as necessary. Then, the protrusion 91 of the cover 9 presses the insulating part 203 of the battery 200 against the mounting part 21 of the insulating substrate 2 by the downward elastic force, and the battery 200 can be mechanically fixed to the insulating substrate 2. Therefore, even if the battery module 100C is used for a long period of time, the risk of the battery 200 being bonded to the insulating substrate 2 is reduced, and the battery 200 is less likely to peel off from the insulating substrate 2. In addition, since the protrusion 91 does not contact the battery 200 when the cover 9 is bonded, the heat when the cover 9 is bonded and the current when the seam is welded are less likely to be transmitted to the battery 200, and the risk of the battery 200 being deteriorated by heat can be reduced. According to the fourth embodiment, the connection reliability of the battery 200 and the long-term reliability of the battery module 100C can be improved.

Furthermore, in the fourth embodiment, the protrusion 91 of the lid 9 corresponds to a pressing member that presses the insulating portion 203 of the battery 200 toward the mounting portion 21 of the insulating substrate 2 by a downward elastic force. Therefore, in the fourth embodiment, the number of parts in the battery package 1C and the battery module 100C can be reduced, and the configurations of the battery package 1C and the battery module 100C can be simplified.

In addition, the fourth embodiment also provides the same effects as those (2) and (3) described above.

Fifth Embodiment
A battery package 1D and a battery module 100D according to a fifth embodiment will be described with reference to Fig. 27 and Fig. 28. Fig. 27 is a schematic plan view showing a battery package 1D and a battery module 100D according to a fifth embodiment. Fig. 27 shows a state in which a lid body 9D is removed, and the lid body 9D is indicated by a two-dot chain line in Fig. 27. Fig. 28 is a schematic cross-sectional view taken along line XXVIII-XXXVIII in Fig. 27.

As shown in the example of Figures 27 and 28, the battery module 100D according to the fifth embodiment includes the battery package 1D according to the fifth embodiment and a battery 200 mounted in the battery package 1D. The battery package 1D according to the fifth embodiment has the same configuration as the battery package 1 according to the first embodiment, except for some configuration. Among the configurations of the battery package 1D according to the fifth embodiment, those that differ from the battery package 1 according to the first embodiment will be described. For ease of explanation, the same reference numerals will be used to denote components that have the same functions as the components described in the first embodiment.

27 and 28, the battery package 1D may have a cup-shaped lid 9D instead of the insulating frame 3, metal frame 8, and flat lid 9. The lid 9D may be positioned so as to cover the mounting portion 21 on the first surface 2a side of the insulating substrate 2. The lid 9D may have an accommodation space 9Ds on the inside for accommodating the battery 200. When the metal lid 9D and the insulating substrate 2 are joined with a brazing material, a frame-shaped metal layer F may be positioned on the upper surface of the insulating substrate 2. The frame-shaped metal film F is made of the same metal powder metallization as the first external electrode 4, etc. The metal lid 9D can be produced by pressing a metal plate.

27 and 28, the battery module 100D according to the fifth embodiment includes the battery package 1D according to the fifth embodiment and a battery 200 mounted on the mounting portion 21 of the insulating substrate 2 of the battery package 1D. The battery 200 may be accommodated in the accommodation space 9Ds of the lid 9D. One electrode portion 201 of the battery 200 may be electrically connected to the first electrode 6. The other electrode portion 202 of the battery 200 may be electrically connected to the second electrode 7. Since the first external electrode 4 and the second external electrode 5 are located on the second surface 2b of the insulating substrate 2, the battery package 1D and the battery module 100D can be surface mounted on a mounting substrate.

In the fifth embodiment, the cover 9D covers the mounting portion 21 of the insulating substrate 2, and the coil spring 10, which is an example of a pressing member, presses the insulating portion 203 of the battery 200 toward the mounting portion 21 of the insulating substrate 2 with a downward elastic force, thereby mechanically fixing the battery 200 to the insulating substrate 2. Therefore, even if the battery module 100D is used for a long period of time, the risk of a decrease in the bonding strength of the battery 200 to the insulating substrate 2 can be reduced. As a result, in the fifth embodiment, the battery 200 is less likely to peel off from the insulating substrate 2, and the connection reliability of the battery 200 and the long-term reliability of the battery module 100D can be improved.

In the example of the fifth embodiment, the lid body 9D has a storage space 9Ds, so the insulating frame body 3 can be omitted from the configuration of the battery package 1D, simplifying the configuration of the battery package 1D and reducing the manufacturing cost of the battery package 1D.

In addition, the fifth embodiment also achieves the same effect as the above-mentioned effect (2).

With reference to Figures 29 and 30, a battery package 1D and a battery module 100D according to another aspect of the fifth embodiment will be described. Figures 29 and 30 are schematic cross-sectional views showing a battery package and a battery module according to another aspect of the fifth embodiment.

As shown in the example of FIG. 29, the lid 9D may have a protrusion 91D protruding downward from its center. The periphery of the protrusion 91D on the lid 9D may be elastically deformable. The protrusion 91D of the lid 9D may be displaceable in the vertical direction by elastic deformation of the periphery. The protrusion 91D of the lid 9D may be elastically deformable in the vertical direction. The lid 9D may correspond to a pressing member that presses the insulating portion 203 of the battery 200 toward the mounting portion 21 of the insulating substrate 2 by a downward elastic force. In this case, the protrusion 91D of the lid 9D may correspond to a pressure contact portion that is in pressure contact with the insulating portion 203 of the battery 200.

When the lid body 9D has a protrusion 91D, the lid body 9D covers the mounting portion 21 of the insulating substrate 2, and the protrusion 91D exerts a downward elastic force to press the insulating portion 203 of the battery 200 toward the mounting portion 21 of the insulating substrate 2, thereby mechanically fixing the battery 200 to the insulating substrate 2.

In addition, since the lid 9D having the protrusion 91D corresponds to a pressing member, according to another example of the fifth embodiment, the number of parts of the battery package 1D can be reduced, simplifying the configuration of the battery package 1D and reducing the manufacturing cost of the battery package 1D.

As shown in the example in FIG. 30, the lid body 9D may be made of ceramics, just like the insulating substrate 2. The lid body 9D made of ceramics may be made by stacking ceramic green sheets and firing them, just like the insulating substrate 2, or by pressing ceramic powder into a cup shape and firing it. The lid body 9D may also have a recess 92D on its back side for accommodating part of a coil spring 10, which is an example of a pressing member.

When the lid body 9D has a recess 92D, it becomes easier to position the coil spring 10 relative to the lid body 9D. Therefore, even if the lid body 9D is cup-shaped or flat, according to other examples of the fifth embodiment, the assembly of the battery module 100D can be improved.

As shown in the examples of Figures 27 to 30, the first surface 2a of the insulating substrate 2 is a flat surface, but the insulating substrate 2 may have an opening on the first surface 2a and a recess for accommodating the battery 200.

Sixth Embodiment
A battery package 1E and a battery module 100E according to a sixth embodiment will be described with reference to Fig. 31. Fig. 31 is a cross-sectional view of the battery package 1E according to the sixth embodiment.

As shown in the example of FIG. 31, the battery module 100E according to the sixth embodiment includes a battery package 1E according to the sixth embodiment and a battery 200 mounted in the battery package 1E.

As shown in the example of FIG. 31, the battery package 1E may include an insulating frame 3 and a cup-shaped lid 9E. The battery 200 may be housed in a space including the housing space 3s of the insulating frame 3 and the housing space 9Es of the lid 9E.

The lid body 9E may be made of ceramics, just like the insulating substrate 2. The lid body 9E made of ceramics may be made by stacking ceramic green sheets and firing them, just like the insulating substrate 2, or by pressing ceramic powder into a cup shape and firing it. The lid body 9E may also have a recess 92E on its back side for accommodating a leaf spring 14, which is an example of a pressing member.

Because the battery package 1E has an insulating frame 3, the height of the lid 9E is lower than, for example, the lid 9D shown in FIG. 30. Also, because the battery package 1E has a lid 9E, the height of the insulating frame 3 is lower than, for example, the insulating frame 3 shown in FIG. 26. Since the heights of the lid 9E and the insulating frame 3 can be reduced, the thickness (wall width) of the lid 9E and the insulating frame 3 can be reduced, and the storage volume for storing the battery 200 can be increased. In other words, the volumetric energy density of the battery module 100E can be improved.

The insulating frame 3 and the lid 9E can be joined using frit sealing, AuSn sealing, solder sealing, or the like, which can provide an airtight seal. When frit sealing is used to seal the insulating frame 3 and the lid 9E, the possibility of a short circuit between the

electrodes

201, 202 of the battery 200 can be reduced.

Other Embodiments
The number of batteries 200 accommodated in the accommodation space 3s of the insulating frame 3 in the battery package 1 (1A to 1E) is not limited to one and may be multiple. The number of batteries 200 accommodated in the accommodation space 9Fs of the lid 9F in the battery package 1F is not limited to one and may be multiple.

A semiconductor device for controlling the battery 200 may be housed in the storage space 3s of the insulating frame 3 in the battery package 1 (1A-1E) and in the storage space 9Fs of the lid 9F in the battery package 1F. The semiconductor device for controlling the battery includes a DC/DC converter that supplies a constant power supply voltage, a reset IC that monitors the power supply, and a switch IC that turns the power supply on and off. Electronic components such as coils and capacitors may also be housed in the storage space 3s of the insulating frame 3 in the battery package 1 (1A-1E) and in the storage space 9Fs of the lid 9F in the battery package 1F.

The battery module 100 (100A to 100E) may be provided with a desiccant that absorbs moisture. The desiccant may be located on the underside of the lid 9. The desiccant may be located between the inner surface of the insulating frame 3 in the battery module 100 (100A to 100C) and the side of the battery 200. For example, silica gel or calcium chloride may be used as the desiccant. If the battery module 100 (100A to 100E) is provided with a desiccant, deterioration of the battery material of the battery 200 due to chemical reactions with moisture can be suppressed.

In one embodiment, (1) an insulating substrate having a first surface, a second surface opposite to the first surface, and a mounting portion located on the first surface side for mounting a battery including two electrode portions, a first external electrode located on the second surface, a second external electrode located on the second surface, a first electrode located on one end side of the mounting portion and electrically connected to the first external electrode, a second electrode located on the other end side of the mounting portion and electrically connected to the second external electrode, a lid located on the first surface side, electrically insulated from the first electrode and the second electrode, and covering the battery, and a pressing member that presses the battery toward the mounting portion by elastic force.

(2) The battery package of (1) may further include a frame body positioned on the first surface so as to surround the mounting portion and having an accommodation space therein for accommodating the battery, and the lid body may close the opening side of the frame body.

(3) In the battery package of (1) or (2), the pressing member may be a metal spring.

(4) In the battery package of (2), the pressing member may be a leaf spring.

(5) The battery package of (4) may further include an upper frame located on the upper surface side of the frame and surrounding the open side of the frame, the leaf spring having a pressure contact portion located in the center and pressed against the battery, and a curved portion located between the center and the end and curved in a convex shape toward the upward direction, the curved portion being pressed from above by the lid, and the end side of the leaf spring being located inside the upper frame on the upper surface of the frame.

(6) In the battery package of (5), the frame may have a recessed step on the opening side, and the end side of the leaf spring may contact the bottom surface of the recessed step.

(7) In the battery package of (6), the end side of the leaf spring may be bent into an arc and positioned from the bottom surface of the recessed step to the inner surface.

(8) In the battery package of (3), the lid may be made of metal, and the metal spring may contact the lid via an insulating member.

(9) In any of the battery packages (4) to (7), an upper frame body may be provided that is located on the upper surface side of the frame body and surrounds the opening side of the frame body, and the leaf spring may exert an elastic force by having both ends of the leaf spring engage with a part of the frame body or a part of the upper frame body from below.

(10) In any of the battery packages (4) to (7), an upper frame is located on the upper surface side of the frame and surrounds the opening side of the frame, the leaf spring has a pressure contact portion located in the center and pressed against the battery, and the end side of the leaf spring is bent into a horizontal U-shape, located on the upper surface of the frame, and pressed from above by the lid.

(11) In any of the battery packages (4) to (7), an upper frame is further provided, which is located on the upper surface side of the frame and surrounds the opening side of the frame, the lid is made of metal, the leaf spring has a pressure contact portion located in the center and pressure-contacts an insulating portion of the battery, and the end side of the leaf spring is located on the upper surface of the frame and may be pressed from above by the lid via an insulating member.

(12) In any of the battery packages (1) to (11), the lid may have a protrusion protruding downward, and the protrusion may correspond to the pressing member.

(13) In the battery package of (12), the protrusion may press the battery from above toward the mounting portion by inverting the battery upside down.

(14) In any of the battery packages (2) to (13), a first support member is located on one end of the mounting portion, electrically connected to the first electrode, elastically deformable, and supports one of the two electrode portions from below, and a second support member is located on the other end of the mounting portion, electrically connected to the second electrode, elastically deformable, and supports the other of the two electrode portions from below.

(15) In the battery package of (14), the insulating substrate may have a partition located on the mounting portion, which separates the first housing area for housing the first support member from a second housing area for housing the second support member within the housing space.

(16) In any of the battery packages (1) to (15), the first electrode may have a first bump and the second electrode may have a second bump.

(17) In the battery packages of (1) to (16), the insulating substrate may have a recess that opens onto the first surface and is located between the first electrode and the second electrode.

(18) The battery package of (17) may further include a support member that is located within the recess, is elastically deformable, and supports the battery from below.

(19) In the battery package of (1), the lid may be cup-shaped, positioned to cover the mounting portion on the first surface side, and have an internal storage space for storing the battery.

(20) In the battery package of (19), the lid may have a protrusion protruding downward from the center thereof, and the lid may correspond to the pressing member.

(21) In any of the battery packages (1) to (20), the lid may have a recess for accommodating a portion of the pressing member.

(22) The battery module includes any one of the battery packages (1) to (21) and a battery mounted on the mounting portion, one of the two electrode portions being electrically connected to the first electrode and the other of the two electrode portions being electrically connected to the second electrode.

(23) A method for sealing a battery module is a method for sealing the battery module, in which the battery module is sealed while the pressing member arranged on the upper surface side of the battery is pressed by the lid.

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

1 Battery package (battery package according to the first embodiment)
2 insulating substrate 2a first surface 2b second surface 2c side surface 21 mounting portion 22 partition portion 23 recess 3 insulating frame (frame)
3s: storage space 4: first external electrode 5: second external electrode 6: first electrode J1: first connection wiring 61: first bump 7: second electrode J2: second connection wiring 71: second bump 8: metal frame (upper frame)
9 Lid 10 Coil spring (pressing member)
11 First support member 12 Second support member 13 Support member 100 Battery module (battery module according to the first embodiment)
200 Battery 201 Electrode portion 202 Electrode portion 203 Insulating portion 1A Battery package (battery package according to the second embodiment)
14 Leaf spring (pressure member)
14a: Pressure-contact portion 14b: Curved portion 31: Concave step portion 31a: Bottom surface 31i: Inner surface 100A: Battery module (battery module according to the second embodiment)
1B Battery package (battery package according to the third embodiment)
15 Rubber plate (elastic member)
100B Battery module (battery module according to the third embodiment)
1C Battery Package (Battery Package According to the Fourth Embodiment)
91 Protrusion 100C Battery module (battery module according to the fourth embodiment)
1D Battery package (battery package according to the fifth embodiment)
9D Lid 9Ds Storage space 91D Protrusion 92D Depression 100D Battery module (battery module according to the fifth embodiment)
1E Battery Package (Battery Package According to the Sixth Embodiment)
9E Lid 9Es Storage space 92E Recess 100E Battery module (battery module according to the fifth embodiment)

Claims

an insulating substrate having a first surface, a second surface opposite to the first surface, and a mounting portion located on the first surface side for mounting a battery including two electrode portions;
a first external electrode located on the second surface;
A second external electrode located on the second surface;
a first electrode located on one end side of the mounting portion and electrically connected to the first external electrode;
a second electrode located on the other end side of the mounting portion and electrically connected to the second external electrode;
a lid body that is located on the first surface side, is electrically insulated from the first electrode and the second electrode, and covers the battery;
a pressing member that presses the battery toward the mounting portion by elastic force.
a frame body that is located on the first surface so as to surround the mounting portion and has an accommodation space therein for accommodating the battery,
The battery package according to claim 1 , wherein the lid closes an open side of the frame.
The battery package according to claim 1 or 2, wherein the pressing member is a metal spring.
The battery package according to claim 2, wherein the pressing member is a leaf spring.
Further, an upper frame body is provided, the upper frame body being located on an upper surface side of the frame body and surrounding an opening side of the frame body.
the leaf spring has a pressure contact portion located at a center portion thereof and pressure-contacting the battery, and a curved portion located between the center portion and an end portion thereof and curved in an upwardly convex shape;
5. The battery package according to claim 4, wherein the curved portion is pressed from above by the lid, and an end side of the leaf spring is located inside the upper frame on the top surface of the frame.
The frame has a recessed step on its opening side,
The battery package according to claim 5 , wherein an end side of the leaf spring contacts a bottom surface of the recessed step portion.
The battery package according to claim 6, wherein the end of the leaf spring is bent in an arc and is located from the bottom surface of the recessed step to the inner surface.
The lid is made of metal,
The battery package according to claim 3 , wherein the metal spring contacts the lid body via an insulating member.
Further, an upper frame body is provided, the upper frame body being located on an upper surface side of the frame body and surrounding an opening side of the frame body.
8. The battery package according to claim 4, wherein the leaf spring exerts an elastic force by having both ends thereof engaged from below with a part of the frame or a part of the upper frame.
Further, an upper frame body is provided, the upper frame body being located on an upper surface side of the frame body and surrounding an opening side of the frame body.
8. The battery package according to claim 4, wherein the leaf spring has a pressure contact portion located at a central portion thereof and pressure-contacting the battery, and an end side of the leaf spring is bent into a horizontal U-shape, located on an upper surface of the frame body, and pressed from above by the lid body.
Further, an upper frame body is provided, the upper frame body being located on an upper surface side of the frame body and surrounding an opening side of the frame body.
The lid is made of metal,
8. The battery package according to claim 4, wherein the leaf spring has a pressure contact portion located at a central portion thereof and pressure-contacting an insulating portion of the battery, and an end side of the leaf spring is located on an upper surface of the frame and is pressed from above by the lid body via an insulating member.
The battery package according to any one of claims 1 to 11, wherein the lid has a protrusion protruding downward, and the protrusion corresponds to the pressing member.
The battery package according to claim 12, wherein the protrusion presses the battery from above toward the mounting portion when the battery is inverted upside down.
a first support member that is located on one end side of the mounting portion, is electrically connected to the first electrode, is elastically deformable, and supports one of the two electrode portions from below;
14. The battery package according to claim 2, further comprising: a second support member located on the other end side of the mounting portion, electrically connected to the second electrode, elastically deformable, and supporting the other of the two electrode portions from below.
The battery package according to claim 14, wherein the insulating substrate is located on the mounting portion and has a partition portion that separates the first housing area for housing the first support member from a second housing area for housing the second support member within the housing space.
The battery package of any one of claims 1 to 15, wherein the first electrode has a first bump and the second electrode has a second bump.
The battery package according to any one of claims 1 to 16, wherein the insulating substrate has a recess that opens on the first surface and is located between the first electrode and the second electrode.
The battery package according to claim 17, further comprising a support member that is located within the recess, is elastically deformable, and supports the battery from below.
The battery package according to claim 1, wherein the lid is cup-shaped, positioned so as to cover the mounting portion on the first surface side, and has an internal storage space for storing the battery.
The battery package according to claim 19, wherein the lid has a protrusion protruding downward from its center, and the lid corresponds to the pressing member.
The battery package according to any one of claims 1 to 20, wherein the lid has a recess for accommodating a portion of the pressing member.
A battery package according to any one of claims 1 to 21;
a battery mounted on the mounting portion, one of the two electrode portions being electrically connected to the first electrode, and the other of the two electrode portions being electrically connected to the second electrode.
23. A method for sealing a battery module according to claim 22, comprising the steps of:
a battery module sealing method comprising: sealing the battery module while pressing the pressing member arranged on an upper surface side of the battery with the lid;