Battery package and battery module

Abstract

The present invention achieves a reduction in size of a battery module while improving the ease of assembly of the battery module. This battery package comprises a first surface, a second surface located opposite the first surface, and an insulating substrate having a recess. The battery package includes a first external electrode located on the second surface and a second external electrode located on the second surface. The battery package includes a first electrode located on the inner surface of the recess and electrically connected to the first external electrode, and a second electrode located on the inner surface of the recess and electrically connected to the second external electrode.

Description

[Technical Field]

[0001] The present disclosure relates to a battery package for mounting cylindrical or laminated batteries, and a battery module. [Background technology]

[0002] Generally, cylindrical batteries have linear lead terminals, which makes it difficult to surface-mount cylindrical batteries on a mounting substrate. In recent years, studies have been conducted to mount cylindrical batteries in a package and then surface-mount the cylindrical batteries on a mounting substrate.

[0003] Furthermore, for example, in the technology described in Patent Document 1, the electronic component is mounted in the package with the linear lead terminals of the electronic component placed on the electrodes of the package (referred to as the joints of the external electrode terminals in Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2007-67644 Summary of the Invention

[0005] The battery package according to the present disclosure comprises an insulating substrate having a first surface, a second surface opposite the first surface, and a recess opening into the first surface, a first external electrode located on the second surface, a second external electrode located on the second surface, a first electrode located on the inner surface of the recess and electrically connected to the first external electrode, and a second electrode located on the inner surface of the recess and electrically connected to the second external electrode.

[0006] The battery module according to the present disclosure includes the battery package and a cylindrical or laminated battery housed in the recess, the battery having a first lead terminal electrically connected to the first electrode in a bent state and a second lead terminal electrically connected to the second electrode in a bent state. [Brief explanation of the drawings]

[0007] [Figure 1] 1A and 1B are a cross-sectional view and a plan view showing a battery module according to a first embodiment. [Figure 2] 4A and 4B are a cross-sectional view and a plan view showing a battery module according to another aspect of the first embodiment. [Figure 3] FIG. 4 is a schematic cross-sectional view showing a battery module according to another aspect of the first embodiment. [Figure 4] FIG. 4 is a schematic cross-sectional view showing a battery module according to another aspect of the first embodiment. [Figure 5] FIG. 4 is a schematic cross-sectional view showing a battery module according to another aspect of the first embodiment. [Figure 6] 10A and 10B are a cross-sectional view and a plan view showing a battery module according to a second embodiment. [Figure 7] FIG. 10 is a schematic cross-sectional view showing a battery module according to another aspect of the second embodiment. [Figure 8] 10A and 10B are a cross-sectional view and a plan view showing a battery module according to a third embodiment. [Figure 9] 10A and 10B are a cross-sectional view and a plan view showing a battery module according to another aspect of the third embodiment. [Figure 10] 10A and 10B are a cross-sectional view and a plan view showing a battery module according to a fourth embodiment. [Figure 11] 10A and 10B are a cross-sectional view and a plan view showing a battery module according to a fifth embodiment. [Figure 12] 10A and 10B are a cross-sectional view and a plan view showing a battery module according to a sixth embodiment. [Figure 13] FIG. 13 is a schematic cross-sectional view showing a battery module according to another aspect of the sixth embodiment. [Figure 14]FIG. 13 is a schematic cross-sectional view showing a battery module according to another aspect of the sixth embodiment. [Figure 15] 13A and 13B are a cross-sectional view and a plan view showing a battery module according to a seventh embodiment. [Figure 16] FIG. 10 is a cross-sectional view showing a battery module according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] When the technology described in Patent Document 1 is applied to a package that mounts a cylindrical battery, it becomes necessary to adjust the height of the joint between the battery's lead terminal and the package's electrode. This makes the assembly of a battery module that includes a cylindrical battery and package complicated, raising concerns about a decrease in the ease of assembly of the battery module.

[0009] Furthermore, when a cylindrical battery is mounted in a package with its lead terminals placed on the electrodes of the package, the package becomes large in plan view, which raises concerns about an increase in the size of the package, or in other words, the size of the battery module.

[0010] The same concerns as above arise when a laminated battery having plate-shaped lead terminals is mounted in a package instead of a cylindrical battery.

[0011] According to the present disclosure, it is possible to improve the assembly efficiency of the battery module while reducing the size of the battery module.

[0012] Battery packages and battery modules according to embodiments will be described in detail below with reference to the drawings. However, for ease of explanation, the figures referenced below show simplified views of only the components necessary for describing the embodiments. Therefore, battery packages and battery modules according to embodiments may include optional components not shown in the figures. Furthermore, the dimensions of the components in the figures do not necessarily faithfully represent the actual dimensions of the components and the dimensional ratios of each member. In this disclosure, the lateral direction refers to the direction perpendicular to the thickness direction of the insulating substrate, in other words, the direction perpendicular to the depth direction of the recess in the insulating substrate. Pressure welding refers to contact with pressure. The term "rectangular" is not limited to a strict rectangular shape and includes shapes that can be visually recognized as rectangular overall, even if the corners are curved.

[0013] A battery package 1 and a battery module 100 according to the first embodiment will be described with reference to the cross-sectional view and plan view of Fig. 1. The cross-sectional view of Fig. 1 is a schematic cross-sectional view taken along line II in the plan view of Fig. 1, and the plan view of Fig. 1 is a schematic plan view showing the battery module 100 according to the first embodiment.

[0014] As shown in the cross-sectional view and plan view of FIG. 1 , a battery module 100 according to the first embodiment includes a battery package 1 according to the first embodiment and a cylindrical battery 200 mounted in the battery package 1. The battery package 1 includes an insulating substrate 2, which may have a rectangular shape in plan view. The insulating substrate 2 is made of ceramics such as an aluminum oxide sintered body (alumina ceramics), an aluminum nitride sintered body, a mullite sintered body, or a glass ceramic sintered body. The insulating substrate 2 is made of a single insulating layer or a plurality of stacked insulating layers.

[0015] The insulating substrate 2 has a first surface 2a and a second surface 2b located on the opposite side to the first surface 2a. The insulating substrate 2 has a recess 21 for accommodating a cylindrical battery 200, and the recess 21 opens to the first surface 2a. The shape of the recess 21 in the insulating substrate 2 in a plan view may be, for example, rectangular. The inner surface of the recess 21 in the insulating substrate 2 may be parallel to the thickness direction of the insulating substrate 2. The size of the recess 21 in the insulating substrate 2 in a plan view may be slightly larger than the size of the battery body 210 of the battery 200 in a plan view. The depth of the recess 21 may be approximately the same as the thickness of the battery body 210 of the battery 200. The shape of the recess 21 in the insulating substrate 2 in a plan view is not limited to a rectangular shape and can be changed depending on the shape of the battery body 210 of the battery 200.

[0016] As shown in the cross-sectional view of FIG. 1, the battery package 1 includes a first external electrode 3 located on the second surface 2b of the insulating substrate 2. The first external electrode 3 may be located on one end of the second surface 2b of the insulating substrate 2. The first external electrode 3 may extend from the second surface 2b of the insulating substrate 2 to a side surface (including a corner between multiple side surfaces). The first external electrode 3 may be electrically connectable to a first electrode of a mounting board via solder. The first external electrode 3 is made of a metal powder metallization containing tungsten (W), molybdenum (Mo), manganese (Mn), silver (Ag), copper (Cu), or the like as an ingredient.

[0017] The battery package 1 includes a second external electrode 4 located on the second surface 2b of the insulating substrate 2. The second external electrode 4 may be located on the other end side of the second surface 2b of the insulating substrate 2. The second external electrode 4 may extend from the second surface 2b of the insulating substrate 2 to a side surface. The second external electrode 4 may be electrically connectable to a second electrode of the mounting board via solder. The second external electrode 4 is made of the same metal powder metallization as the first external electrode 3.

[0018] As shown in the cross-sectional view and plan view of FIG. 1, the battery package 1 includes a first electrode 5 located on the inner surface of the recess 21 of the insulating substrate 2, and the first electrode 5 is electrically connected to the first external electrode 3. The first electrode 5 may extend along the depth direction of the recess 21 of the insulating substrate 2 (hereinafter referred to as the depth direction of the recess 21). The first electrode 5 may extend up to the height position of the bottom surface of the recess 21 of the insulating substrate 2. The shape of the first electrode 5 as seen from inside the recess 21 of the insulating substrate 2 may be rectangular. The first electrode 5 is made of the same metal powder metallization as the first external electrode 3, etc.

[0019] The battery package 1 includes a second electrode 6 located on the inner surface of the recess 21 of the insulating substrate 2, and the second electrode 6 is electrically connected to the second external electrode 4. The second electrode 6 may extend along the depth direction of the recess 21. The second electrode 6 may extend up to the height position of the bottom surface of the recess 21 of the insulating substrate 2. The shape of the second electrode 6 when viewed from inside the recess 21 of the insulating substrate 2 may be rectangular. The first electrode 5 and the second electrode 6 may be arranged side by side. The second electrode 6 is made of the same metal powder metallization as the first external electrode 3, etc.

[0020] As shown in the cross-sectional view and plan view of FIG. 1 , the insulating substrate 2 may have a protrusion 22 located between the first electrode 5 and the second electrode 6 on the inner surface of the recess 21. In other words, the recess 21 of the insulating substrate 2 may have a protrusion 22 located between the first electrode 5 and the second electrode 6 on its inner surface. The protrusion 22 of the insulating substrate 2 may extend in the depth direction of the recess 21 from the opening side of the recess 21 toward the bottom side. The insulating substrate 2 may also have a step 23 on the edge of the recess 21. A step surface 23f of the step 23 of the insulating substrate 2 is located closer to the opening of the recess 21 than the first electrode 5 and the second electrode 6. The step 23 of the insulating substrate 2 may be located around the entire edge of the recess 21.

[0021] As shown in the cross-sectional view of Figure 1, the battery package 1 may include a first connection wiring 7 that electrically connects the first electrode 5 and the first external electrode 3. The first connection wiring 7 may have a through conductor that penetrates one or more insulating layers and one or more wiring layers located between the insulating layers. The first connection wiring 7 is made of the same metal powder metallization as the first external electrode 3, etc.

[0022] The battery package 1 may include a second connection wiring 8 that electrically connects the second electrode 6 and the second external electrode 4. The second connection wiring 8 may have one or more through conductors that penetrate one or more insulating layers and one or more wiring layers located between the insulating layers. The second connection wiring 8 is made of the same metal powder metallization as the first external electrode 3, etc.

[0023] In the example shown in the cross-sectional view and plan view of FIG. 1 , when insulating substrate 2 is made of, for example, an aluminum oxide sintered body, insulating substrate 2 is produced as follows. A suitable organic binder, solvent, etc. are added to and mixed with raw material powders such as aluminum oxide and silicon oxide to produce a slurry. This slurry is formed into a sheet using a doctor blade method, a calendar roll method, or the like 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 recesses 21 with protrusions 22 and steps 23. A plurality of ceramic green sheets for the insulating layer are then stacked to produce a laminate for insulating substrate 2. The laminate for insulating substrate 2 is then fired at a high temperature (approximately 1300 to 1600°C) to produce insulating substrate 2.

[0024] The battery package 1 may include a frame 9 that surrounds the recess 21 on the first surface 2a of the insulating substrate 2. The frame 9 may include a frame-shaped metal film 91 that is positioned so as to surround the recess 21 on the first surface 2a of the insulating substrate 2, and a metal frame 92 that is joined to the frame-shaped metal film 91 with a brazing material. The frame-shaped metal film 91 is made of the same metal powder metallization as the first external electrode 3, etc. The material that constitutes the metal frame 92 should preferably have a small thermal expansion difference with respect to ceramics, and may be, for example, an iron-nickel (Fe-Ni) alloy or an iron-nickel-cobalt (Fe-Ni-Co) alloy. The battery package 1 may also omit the metal frame 92 from the configuration of the frame 9.

[0025] When the first external electrode 3, the second external electrode 4, the first electrode 5, the second electrode 6, the first connection wiring 7, the second connection wiring 8, and the frame-shaped metal film 91 are, for example, metallized layers of tungsten, they can be formed as follows. The first external electrode 3, the second external electrode 4, the first electrode 5, the second electrode 6, the wiring layer of the first connection wiring 7, the wiring layer of the second connection wiring 8, and the frame-shaped metal film 91 are formed by printing a metal paste, which is made by mixing tungsten powder with an organic solvent and an organic binder, at predetermined positions on ceramic green sheets for the insulating layer by a method such as screen printing, and then firing the laminate for the insulating substrate 2. The through conductors of the first connection wiring 7 and the second connection wiring 8 are formed by providing through conductor holes at predetermined positions on the ceramic green sheets for the insulating layer and filling the through conductor holes with metal paste.

[0026] The surfaces of the first external electrode 3, the second external electrode 4, the first electrode 5, the second electrode 6, the first connection wiring 7, and the second connection wiring 8 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 3, the second external electrode 4, 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.

[0027] The battery package 1 may include a flat lid 10 that closes the opening of the frame 9. The lid 10 may have, for example, a rectangular shape in plan view. The lid 10 may have a shape other than rectangular as long as it can close the opening of the frame 9. The lid 10 is made of, for example, ceramics or metal. The lid 10 may be made of a material that has a small thermal expansion difference with ceramics, such as an iron-nickel (Fe-Ni) alloy or an iron-nickel-cobalt (Fe-Ni-Co) alloy.

[0028] The lid body 10 and the frame 9 may be joined using a joining material such as a brazing material. The lid body 10 and the frame 9 may be joined using glass or a brazing material as a joining material in order to increase the airtightness of the battery module 100. When the lid body 10 and the frame 9 made of ceramics are joined using a brazing material, a metal film having the same configuration as the frame-shaped metal film 91 may also be located on the outer edge of the underside of the lid body 10.

[0029] The metal lid 10 and the metal frame 92 of the frame 9 may be joined by welding, such as seam welding, to improve the airtight sealing of the battery module 100. If the metal frame 92 is omitted from the configuration of the frame 9, the metal lid 10 and the frame-shaped metal film 91 may be joined by welding, such as seam welding, direct seam welding, laser welding, or electron beam welding. Joining using seam welding, direct seam welding, laser welding, or electron beam welding involves localized heating of the joint, and therefore reduces the thermal impact on the battery 200 compared to using brazing joining, which involves overall heating (reflow heating).

[0030] The battery package 1 may be hermetically sealed in a low dew point atmosphere, such as a nitrogen atmosphere, an argon atmosphere, or a vacuum atmosphere. This allows the area around the cylindrical battery 200 to be maintained in a low dew point environment, preventing moisture and oxygen from entering the battery package 1 from the outside and reducing the risk of deterioration of the battery material of the battery 200. Furthermore, before sealing the battery package 1, moisture inside the battery package 1 may be evaporated by pre-baking or the like.

[0031] As shown in the cross-sectional view and plan view of FIG. 1 , the battery module 100 includes a battery package 1 and a cylindrical battery 200 housed in a recess 21 of an insulating substrate 2 of the battery package 1. The cylindrical battery 200 may be bonded to the bottom surface of the recess 21 of the insulating substrate 2 with a bonding material such as a resin adhesive. The cylindrical battery 200 has a battery body 210 and a linear first lead terminal 220 and a linear second lead terminal 230 protruding from one side of the battery body 210. The battery body 210 may have a rectangular shape in a plan view. There may be a gap between the battery body 210 and the inner surface of the recess 21 of the insulating substrate 2.

[0032] The first lead terminal 220 may be electrically connected to the first electrode 5 in a state where it is bent downward (towards the bottom surface of the recess 21 of the insulating substrate 2). The second lead terminal 230 may be electrically connected to the second electrode 6 in a state where it is bent downward. The first lead terminal 220 and the second lead terminal 230 may be bent so as to be pressed against the first electrode 5 and the second electrode 6 by elastic force, respectively. The first lead terminal 220 may be joined to the first electrode 5 by a conductive bonding material J such as solder or a conductive resin. The second lead terminal 230 may be joined to the second electrode 6 by a conductive bonding material J.

[0033] A portion of the first lead terminal 220 and a portion of the second lead terminal 230 may be bent in an arch shape so that the first lead terminal 220 and the second lead terminal 230 can each effectively exert an elastic force. A portion of the first lead terminal 220 and the second lead terminal 230 may be bent in a coil shape. As long as the first lead terminal 220 and the second lead terminal 230 can each effectively exert an elastic force, the first electrode 5 and the second electrode 6 may be bent into an appropriate shape.

[0034] As shown in the cross-sectional view and plan view of FIG. 1 , in the battery package 1 according to the first embodiment, the first electrode 5 and the second electrode 6 are located on the inner surface of the recess 21 of the insulating substrate 2. Therefore, when a cylindrical battery 200 is housed in the recess 21 of the insulating substrate 2 with the first lead terminal 220 and the second lead terminal 230 bent, the first lead terminal 220 and the second lead terminal 230 are electrically connected to the first electrode 5 and the second electrode 6, respectively. This allows the cylindrical battery 200 to be mounted in the battery package 1 without adjusting the height of the joint (connection) between the first lead terminal 220 and the first electrode 5 and the joint between the second lead terminal 230 and the second electrode 6. Therefore, according to the example of the first embodiment, the assembly of a battery module 100 including the battery package 1 and the battery 200 can be improved.

[0035] Furthermore, as described above, the cylindrical battery 200 is housed in the recess 21 of the insulating substrate 2 with the first lead terminal 220 and the second lead terminal 230 bent. Therefore, the size of the recess 21 of the insulating substrate 2 can be reduced in plan view by the amount of bending of the first lead terminal 220 and the second lead terminal 230. As a result, according to the first embodiment, the battery package 1 can be made smaller, in other words, the battery module 100 can be made smaller.

[0036] When the first electrode 5 and the second electrode 6 are arranged side by side, the conductive bonding material J for joining the first lead terminal 220 to the first electrode 5 (hereinafter referred to as the conductive bonding material J for the first lead terminal 220) is less likely to drip onto the second electrode 6. The conductive bonding material J for joining the second lead terminal 230 to the second electrode 6 (hereinafter referred to as the conductive bonding material J for the second lead terminal 230) is less likely to drip onto the first electrode 5. As a result, according to the example of the first embodiment, it is possible to reduce the possibility of a short circuit between the first electrode 5 and the second electrode 6 due to dripping of the conductive bonding material J (effect of avoiding a short circuit due to dripping of the conductive bonding material J).

[0037] When the protrusion 22 is located between the first electrode 5 and the second electrode 6 on the inner surface of the recess 21 of the insulating substrate 2, the conductive bonding material J for the first lead terminal 220 and the conductive bonding material J for the second lead terminal 230 are less likely to come into contact with each other. As a result, according to the example of the first embodiment, the possibility of a short circuit between the first electrode 5 and the second electrode 6 can be reduced (effect of the protrusion 22).

[0038] When the first electrode 5 and the second electrode 6 arranged in the horizontal direction each extend up to the height position of the bottom surface of the recess 21 of the insulating substrate 2, it is possible to increase the bonding area between the first lead terminal 220 and the first electrode 5 (the bonding area between the conductive bonding material J and the first electrode 5) and the bonding area between the second lead terminal 230 and the second electrode 6 (the bonding area between the conductive bonding material J and the second electrode 6). This increases the bonding strength (bonding force) of the first lead terminal 220 to the first electrode 5 and the bonding strength of the second lead terminal 230 to the second electrode 6. Therefore, according to the example of the first embodiment, it is possible to improve the connection reliability of the battery module 100.

[0039] When the battery package 1 includes the lid 10, the battery package 1 can be hermetically sealed, reducing the possibility of moisture and the like penetrating into the battery package 1. In particular, when the insulating substrate 2 is made of ceramics, the battery package 1 can be hermetically sealed, further reducing the possibility of moisture and the like penetrating into the battery package 1. As a result, according to the first embodiment, it is possible to suppress deterioration of the cylindrical battery 200 mounted in the battery package 1 and improve the long-term durability (lifespan) of the battery module 100 (action related to hermetic sealing).

[0040] When the insulating substrate 2 has the step portion 23, the conductive bonding material J for the first lead terminal 220 and the conductive bonding material J for the second lead terminal 230 are less likely to come into contact with the frame portion 9. As a result, according to the example of the first embodiment, it is possible to reduce the possibility of a short circuit between the first electrode 5 and the frame portion 9 and between the second electrode 6 and the frame portion 9 (action and effect related to the step portion 23).

[0041] (Another aspect of the first embodiment) Other aspects of the battery package 1 and battery module 100 according to the first embodiment will be described with reference to Fig. 2 to Fig. 5. The cross-sectional view of Fig. 2 is a schematic cross-sectional view taken along line II-II in the plan view of Fig. 2. The plan view of Fig. 2 is a schematic plan view showing a battery module 100 according to another aspect of the first embodiment. Figs. 3 to 5 are schematic cross-sectional views showing a battery module 100 according to another aspect of the first embodiment.

[0042] As shown in the cross-sectional view and plan view of FIG. 2 , the insulating substrate 2 may have recesses 24, 25 located at positions corresponding to the first electrode 5 and the second electrode 6, respectively, on the bottom surface of the recess 21. The recess 24 of the insulating substrate 2 may hold a conductive bonding material J for the first lead terminal 220. The recess 25 of the insulating substrate 2 may hold a conductive bonding material J for the second lead terminal 230. The first electrode 5 may extend to the inner surface of the recess 24 that is continuous with the inner surface of the recess 21 of the insulating substrate 2. The first electrode 5 may extend to the bottom surface of the recess 24 of the insulating substrate 2. The second electrode 6 may extend to the inner surface of the recess 25 that is continuous with the inner surface of the recess 21 of the insulating substrate 2. The second electrode 6 may extend to the bottom surface of the recess 25 of the insulating substrate 2. The recesses 24 and 25 in the insulating substrate 2 are formed by subjecting the ceramic green sheet for the insulating layer to an appropriate punching process.

[0043] 2, when the insulating substrate 2 has recesses 24, 25, the conductive bonding material J for the first lead terminal 220 and the conductive bonding material J for the second lead terminal 230 are less likely to come into contact with each other at the bottom surface of the recess 21 of the insulating substrate 2. As a result, according to another example of the first embodiment, it is possible to reduce the possibility of a short circuit between the first electrode 5 and the second electrode 6 due to the conductive bonding material J spreading over the bottom surface of the recess 21 of the insulating substrate 2.

[0044] When the first electrode 5 and the second electrode 6 extend to the inner surfaces or bottom surfaces of the recesses 24, 25 of the insulating substrate 2, respectively, it is possible to increase the bonding area between the first lead terminal 220 and the first electrode 5, and the bonding area between the second lead terminal 230 and the second electrode 6. This increases the bonding strength of the first lead terminal 220 to the first electrode 5, and the bonding strength of the second lead terminal 230 to the second electrode 6. Therefore, according to this example of another aspect of the first embodiment, it is possible to further improve the connection reliability of the battery module 100.

[0045] As shown in the example in FIG. 3 , the insulating substrate 2 may have a second recess 26 that opens to the bottom surface of the recess 21. The second recess 26 of the insulating substrate 2 is a recess that can engage with a lower portion that is a part of the battery body 210 of the cylindrical battery 200. The shape of the second recess 26 of the insulating substrate 2 in a plan view may be, for example, rectangular. The inner surface of the second recess 26 of the insulating substrate 2 may be parallel to the thickness direction of the insulating substrate 2. The size of the second recess 26 of the insulating substrate 2 in a plan view corresponds to the size of the battery body 210 of the battery 200. The shape of the second recess 26 of the insulating substrate 2 in a plan view is not limited to a rectangular shape and can be changed depending on the shape of the battery body 210 of the battery 200.

[0046] The cylindrical battery 200 in the battery module 100 is housed in the recess 21 of the insulating substrate 2 with the lower part of the battery body 210 engaged with the second recess 26 of the insulating substrate 2. The cylindrical battery 200 may be bonded to the bottom surface of the second recess 26 of the insulating substrate 2 with a bonding material such as a resin adhesive.

[0047] 3, when the insulating substrate 2 has the second recess 26, the cylindrical battery 200 can be easily positioned relative to the insulating substrate 2 by engaging the lower part of the battery body 210 with the second recess 26 of the insulating substrate 2. This makes it possible to further improve the assembly ease of the battery module 100 according to this example of another aspect of the first embodiment.

[0048] 4 and 5, the first electrode 5 may extend from the center of the recess 21 in the depth direction of the insulating substrate 2 to the opening side of the recess 21. The second electrode 6 may extend from the center of the recess 21 in the depth direction of the insulating substrate 2 to the opening side of the recess 21. In the examples shown in FIGS. 6 and 7, the second electrode 6 is illustrated overlapping the first electrode 5.

[0049] As in the examples shown in FIGS. 4 and 5 , in the battery module 100, the first lead terminal 220 may be electrically connected to the first electrode 5 in a state where it is bent upward (toward the opening side of the recess 21 of the insulating substrate 2). The second lead terminal 230 may be electrically connected to the second electrode 6 in a state where it is bent upward. The first lead terminal 220 may be joined to the first electrode 5 by a conductive bonding material J. The second lead terminal 230 may be joined to the second electrode 6 by a conductive bonding material J. The first lead terminal 220 may be mechanically joined to the first electrode 5 without using the conductive bonding material J. The second lead terminal 230 may be mechanically joined to the second electrode 6 without using the conductive bonding material J.

[0050] 5 , among the multiple inner surfaces of recess 21 of insulating substrate 2, the inner surface of recess 21 where first electrode 5 and second electrode 6 are located (referred to as the electrode-side inner surface of recess 21) may be inclined outward with respect to the depth direction of recess 21. The inner surface facing the electrode-side inner surface of recess 21 may be inclined outward with respect to the depth direction of recess 21.

[0051] 4 and 5 , when the first electrode 5 and the second electrode 6 extend from the center in the depth direction of the recess 21 of the insulating substrate 2 toward the opening side of the recess 21, the battery 200 can be inserted (housed) in the recess 21 of the insulating substrate 2 with the first lead terminal 220 and the second lead terminal 230 bent upward. This reduces the insertion resistance of the first lead terminal 220 or the second lead terminal 230 of the battery 200 into the recess 21 of the insulating substrate 2. Therefore, according to another example of the first embodiment, the assembly of the battery module 100 including the battery package 1 and the battery 200 can be further improved.

[0052] 5 , when the inner surface on the electrode side of the recess 21 is inclined outward relative to the depth direction of the recess 21, the first electrode 5 and the second electrode 6 are inclined outward relative to the depth direction of the recess 212. This can further reduce the insertion resistance of the first lead terminal 220 or the second lead terminal 230 of the battery 200 into the recess 21 of the insulating substrate 2. Therefore, according to this example of another aspect of the first embodiment, the assembly of the battery module 100 can be further improved.

[0053] [Embodiment 2] A battery package 1A and a battery module 100A according to the second embodiment will be described with reference to the cross-sectional view and plan view of Fig. 6. The cross-sectional view of Fig. 6 is a schematic cross-sectional view taken along line VI-VI in the plan view of Fig. 6. The plan view of Fig. 6 is a schematic plan view showing a battery module 100A according to the second embodiment.

[0054] As shown in the cross-sectional view and plan view of FIG. 6, the battery package 1A according to the second embodiment includes the battery package 1A according to the second embodiment and a cylindrical battery 200 mounted in the battery package 1A. 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 components. The following describes the configuration of the battery package 1A according to the second embodiment that differs from the battery package 1 according to the first embodiment. For ease of explanation, the same reference numerals are used for components that have the same functions as those described in the first embodiment.

[0055] The battery package 1A includes a first electrode 5A located on the inner surface of the recess 21 of the insulating substrate 2. The first electrode 5A corresponds to the first electrode 5 of the battery package 1. The first electrode 5A may be made of a metal body filled in an elongated groove 27 that opens to the inner surface of the recess 21 of the insulating substrate 2. The first electrode 5A may extend to the upper end (the end on the step portion 23 side) of the groove 27 of the insulating substrate 2. The groove 27 of the insulating substrate 2 may extend along the depth direction of the recess 21. The groove 27 of the insulating substrate 2 may extend to the opening side of the recess 21. The first electrode 5A may extend along the depth direction of the recess 21. The first electrode 5A may extend up to the height position of the bottom surface of the recess 21 of the insulating substrate 2. The first electrode 5A is made of the same metal powder metallization as the first external electrode 3, etc. The shape of the groove 27 of the insulating substrate 2 is not limited to being elongated.

[0056] The battery package 1A includes a second electrode 6A located on the inner surface of the recess 21 of the insulating substrate 2. The second electrode 6A corresponds to the second electrode 6 of the battery package 1. The second electrode 6A may be formed of a metal body filled in an elongated groove 28 that opens to the inner surface of the recess 21 of the insulating substrate 2. The groove 28 of the insulating substrate 2 may extend along the depth direction of the recess 21. The groove 28 of the insulating substrate 2 may extend to the opening side of the recess 21. The second electrode 6A may extend along the depth direction of the recess 21. The second electrode 6A may extend to the upper end of the groove 28 of the insulating substrate 2. The second electrode 6A may extend to the height of the bottom surface of the recess 21 of the insulating substrate 2. The first electrode 5A and the second electrode 6A may be arranged horizontally. The second electrode 6A is made of the same metal powder metallization as the first external electrode 3. The shape of the groove 28 of the insulating substrate 2 is not limited to being elongated.

[0057] Grooves 27, 28 in insulating substrate 2 are formed by suitable punching of ceramic green sheets for the insulating layer. When first electrode 5A and second electrode 6A are made of, for example, tungsten metallization powder, first electrode 5A and second electrode 6A are formed by filling holes corresponding to grooves 27, 28 formed at predetermined positions in ceramic green sheets for the insulating layer with metal paste and punching out portions of the paste. Metal plating layers such as nickel plating layers / gold plating layers may be deposited on the surfaces of first electrode 5A and second electrode 6A that are exposed to the outside by plating methods such as electroplating or electroless plating.

[0058] 6, the first electrode 5A and the second electrode 6A may each extend to the bottom surface of the recess 21 of the insulating substrate 2. The portions of the first electrode 5A and the second electrode 6A that extend along the bottom surface of the recess 21 of the insulating substrate 2 are formed by printing, by a method such as screen printing, at predetermined positions on a ceramic green sheet for an insulating layer, in the same manner as the first connection wiring 7. The portion of the first connection wiring 7 that extends to the bottom surface of the recess 21 may also be the portion that extends along the bottom surface of the first electrode 5A.

[0059] The protrusion 22 of the insulating substrate 2 may be located between the first electrode 5A and the second electrode 6A on the inner surface of the recess 21. Furthermore, the step 23 of the insulating substrate 2 may be located on the edge of the recess 21 closer to the opening of the recess 21 than the first electrode 5A and the second electrode 6A.

[0060] 6, the metal lid 10 may be joined to the frame-shaped metal film 91 by welding such as seam welding, direct seam welding, laser welding, or electron beam welding. Since joining using seam welding, direct seam welding, laser welding, or electron beam welding involves localized heating of the joining portion, the thermal impact on the battery 200 is reduced compared to when brazing joining is used, which involves overall heating (reflow heating).

[0061] 6, in the battery module 100A, the first lead terminal 220 may be electrically connected to the first electrode 5A in a state where it is bent downward. The second lead terminal 230 may be electrically connected to the second electrode 6A in a state where it is bent downward. The first lead terminal 220 may be joined to the first electrode 5A by a conductive bonding material J. The second lead terminal 230 may be joined to the second electrode 6A by a conductive bonding material J.

[0062] The technology applied to the battery package 1 according to another aspect of the first embodiment shown in FIG. 3 may be applied to the battery package 1A.

[0063] As shown in the cross-sectional and plan views of FIG. 6 , in a battery package 1A according to the second embodiment, the first electrode 5A and the second electrode 6A are located on the inner surface of the recess 21 of the insulating substrate 2. Therefore, when a cylindrical battery 200 is housed in the recess 21 of the insulating substrate 2 with the first lead terminal 220 and the second lead terminal 230 bent, the first lead terminal 220 and the second lead terminal 230 are electrically connected to the first electrode 5A and the second electrode 6A, respectively. This allows the cylindrical battery 200 to be mounted in the battery package 1A without adjusting the height of the joint between the first lead terminal 220 and the first electrode 5A and the joint between the second lead terminal 230 and the second electrode 6A. Therefore, according to the second embodiment, the assembly of a battery module 100A including the battery package 1A and the battery 200 can be improved.

[0064] Furthermore, as described above, the cylindrical battery 200 is housed in the recess 21 of the insulating substrate 2 with the first lead terminal 220 and the second lead terminal 230 bent. Therefore, the size of the recess 21 of the insulating substrate 2 can be reduced in plan view by the amount of bending of the first lead terminal 220 and the second lead terminal 230. As a result, according to the second embodiment, the battery package 1A, in other words, the battery module 100A, can be made smaller.

[0065] When the first electrode 5A and the second electrode 6A arranged in the horizontal direction each extend up to the height position of the bottom surface of the recess 21 of the insulating substrate 2, the bonding area between the first lead terminal 220 and the first electrode 5A (the bonding area between the conductive bonding material J and the first electrode 5A) and the bonding area between the second lead terminal 230 and the second electrode 6A (the bonding area between the conductive bonding material J and the second electrode 6A) can be increased. This increases the bonding strength of the first lead terminal 220 to the first electrode 5A and the bonding strength of the second lead terminal 230 to the second electrode 6A. Therefore, according to the second embodiment, the connection reliability of the battery module 100A can be improved.

[0066] When the first electrode 5A and the second electrode 6A each extend to the bottom surface of the recess 21 of the insulating substrate 2, the bonding area between the first lead terminal 220 and the first electrode 5A and the bonding area between the second lead terminal 230 and the second electrode 6A can be further increased. Furthermore, the bonding interfaces between the conductive bonding material J and the first electrode 5A and the second electrode 6A are multifaceted (curved). This increases the bonding strength of the first lead terminal 220 to the first electrode 5A and the bonding strength of the second lead terminal 230 to the second electrode 6A. Therefore, according to the second embodiment, the connection reliability of the battery module 100A can be improved.

[0067] When the first electrode 5A and the second electrode 6A are metal bodies respectively filled in the grooves 27, 28 of the insulating substrate 2, it is possible to increase the bonding area between the first electrode 5A and the insulating substrate 2 and the bonding area between the second electrode 6A and the insulating substrate 2. This increases the bonding strength of the first electrode 5A to the insulating substrate 2 and the bonding strength of the second electrode 6A to the insulating substrate 2. Therefore, according to the second embodiment, it is possible to improve the long-term reliability of the battery module.

[0068] In addition, the second embodiment also provides the above-described effects of avoiding short circuits due to dripping of the conductive bonding material J, hermetic sealing, the protrusions 22, and the step portions 23.

[0069] (Another aspect of the second embodiment) Another aspect of the battery package 1A and battery module 100A according to the second embodiment will be described with reference to Fig. 7. Fig. 7 is a schematic cross-sectional view showing a battery module 100A according to another aspect of the second embodiment.

[0070] 7, the first electrode 5A may extend from the center of the depth direction of the recess 21 of the insulating substrate 2 toward the opening side of the recess 21. The second electrode 6A may extend from the center of the depth direction of the recess 21 of the insulating substrate 2 toward the opening side of the recess 21. In the example shown in FIG. 10, the second electrode 6A is shown overlapping the first electrode 5B.

[0071] As shown in the example in FIG. 7 , the insulating substrate 2 may have a second recess 26 that opens to the bottom surface of the recess 21. The second recess 26 of the insulating substrate 2 is a recess that can engage with a lower portion that is a part of the battery body 210 of the cylindrical battery 200. The shape of the second recess 26 of the insulating substrate 2 in a plan view may be, for example, rectangular. The inner surface of the second recess 26 of the insulating substrate 2 may be parallel to the thickness direction of the insulating substrate 2. The size of the second recess 26 of the insulating substrate 2 in a plan view corresponds to the size of the battery body 210 of the battery 200. The shape of the second recess 26 of the insulating substrate 2 in a plan view is not limited to a rectangular shape and can be changed depending on the shape of the battery body 210 of the battery 200.

[0072] As shown in the example of FIG. 7 , in a battery module 100A, the first lead terminal 220 may be electrically connected to the first electrode 5A in a state where it is bent upward. The second lead terminal 230 may be electrically connected to the second electrode 6A in a state where it is bent upward. The first lead terminal 220 may be joined to the first electrode 5A by a conductive bonding material J. The second lead terminal 230 may be joined to the second electrode 6A by a conductive bonding material J. The first lead terminal 220 may be mechanically joined to the first electrode 5A without using the conductive bonding material J. The second lead terminal 230 may be mechanically joined to the second electrode 6A without using the conductive bonding material J.

[0073] 7 , when the first electrode 5A and the second electrode 6A extend from the center in the depth direction of the recess 21 of the insulating substrate 2 toward the opening side of the recess 21, the battery 200 can be inserted (housed) in the recess 21 of the insulating substrate 2 with the first lead terminal 220 and the second lead terminal 230 bent upward. This reduces the insertion resistance of the first lead terminal 220 or the second lead terminal 230 of the battery 200 into the recess 21 of the insulating substrate 2. Therefore, according to another example of the second embodiment, the assembly of the battery module 100A including the battery package 1A and the battery 200 can be further improved.

[0074] [Embodiment 3] A battery package 1B and a battery module 100B according to the third embodiment will be described with reference to the cross-sectional view and plan view of Fig. 8. The cross-sectional view of Fig. 8 is a schematic cross-sectional view taken along line VIII-VIII in the plan view of Fig. 8. The plan view of Fig. 8 is a schematic plan view showing a battery module 100B according to the third embodiment.

[0075] As shown in the cross-sectional view and plan view of FIG. 8, the battery package 1B according to the third embodiment includes the battery package 1B according to the third embodiment and a cylindrical 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 components. The following describes the configuration of the battery package 1B according to the third embodiment that differs from the battery package 1 according to the first embodiment. For ease of explanation, the same reference numerals are used for components that have the same functions as the components described in the first embodiment.

[0076] The battery package 1B includes a first electrode 5B located on the inner surface of the recess 21 of the insulating substrate 2, and the first electrode 5B corresponds to the first electrode 5 of the battery package 1. The first electrode 5B may be a metal film (metal layer) located along the inner surface of an elongated groove 27 that opens to the inner surface of the recess 21 of the insulating substrate 2. The first electrode 5B may extend along the depth direction of the recess 21. The first electrode 5B may extend to the upper end of the groove 27 of the insulating substrate 2. The first electrode 5B may extend to the height position of the bottom surface of the recess 21 of the insulating substrate 2. The first electrode 5B may extend to the bottom surface of the recess 21 of the insulating substrate 2. The first electrode 5B is made of the same metal powder metallization as the first external electrode 3, etc. The shape of the groove 27 of the insulating substrate 2 is not limited to being elongated.

[0077] The battery package 1B includes a second electrode 6B located on the inner surface of the recess 21 of the insulating substrate 2, and the second electrode 6B corresponds to the second electrode 6 of the battery package 1. The second electrode 6B may be a metal film (metal layer) along the inner surface of an elongated groove 28 that opens to the inner surface of the recess 21 of the insulating substrate 2. The second electrode 6B may extend along the depth direction of the recess 21. The second electrode 6B may extend to the upper end of the groove 28 of the insulating substrate 2. The second electrode 6B may extend to the height position of the bottom surface of the recess 21 of the insulating substrate 2. The first electrode 5B and the second electrode 6B may be arranged horizontally. The second electrode 6B is made of the same metal powder metallization as the first external electrode 3, etc. The shape of the groove 28 of the insulating substrate 2 is not limited to being elongated.

[0078] The first electrode 5B and the second electrode 6B are formed on the inner surfaces of the grooves 27, 28 of the insulating substrate 2, for example, by hole printing. The method for forming the first electrode 5B and the second electrode 6B is not limited to hole printing, and may be, for example, coating, vapor deposition, or other techniques. The surfaces of the first electrode 5B and the second electrode 6B exposed to the outside may be coated with a metal plating layer such as a nickel plating layer or a gold plating layer by a plating method such as electrolytic plating or electroless plating.

[0079] As shown in the cross-sectional view of FIG. 8 , the first electrode 5B and the second electrode 6B may each extend to the bottom surface of the recess 21 of the insulating substrate 2. The portions of the first electrode 5B and the second electrode 6B that extend to the bottom surface of the recess 21 of the insulating substrate 2 are formed by printing, in the same manner as the first electrode 5, a predetermined position on a ceramic green sheet for an insulating layer by a method such as screen printing. The wiring layer of the first connection wiring 7 may extend from the first electrode 5B side to the bottom surface of the recess 21 of the insulating substrate 2. The wiring layer of the second connection wiring 8 may extend from the second electrode 6B side to the bottom surface of the recess 21 of the insulating substrate 2.

[0080] The protrusion 22 of the insulating substrate 2 may be located between the first electrode 5B and the second electrode 6B on the inner surface of the recess 21. The step 23 of the insulating substrate 2 may be located on the edge of the recess 21 closer to the opening of the recess 21 than the first electrode 5B and the second electrode 6B. In the battery package 1B, the protrusion 22 may be omitted from the configuration of the insulating substrate 2.

[0081] 8, in the battery module 100B, the first lead terminal 220 may be bent downward and inserted into the groove 27 of the insulating substrate 2 to be electrically connected to the first electrode 5B. The second lead terminal 230 may be bent downward and inserted into the groove 28 of the insulating substrate 2 to be electrically connected to the second electrode 6B. The first lead terminal 220 may be joined to the first electrode 5B by a conductive bonding material J. The second lead terminal 230 may be joined to the second electrode 6B by a conductive bonding material J.

[0082] The technology applied to the battery package 1 according to another aspect of the first embodiment shown in FIG. 3 may be applied to the battery package 1B.

[0083] As shown in the cross-sectional view and plan view of FIG. 8 , in a battery package 1B according to the third embodiment, the first electrode 5B and the second electrode 6B are located on the inner surface of the recess 21 of the insulating substrate 2. Therefore, when a cylindrical battery 200 is housed in the recess 21 of the insulating substrate 2 with the first lead terminal 220 and the second lead terminal 230 bent, the first lead terminal 220 and the second lead terminal 230 are electrically connected to the first electrode 5B and the second electrode 6B, respectively. This allows the cylindrical battery 200 to be mounted in the battery package 1B without adjusting the height of the joint between the first lead terminal 220 and the first electrode 5B and the joint between the second lead terminal 230 and the second electrode 6B. Therefore, according to the third embodiment, the assembly of a battery module 100B including the battery package 1B and the battery 200 can be improved.

[0084] In particular, when the first lead terminal 220 and the second lead terminal 230 are inserted into the grooves 27, 28 of the insulating substrate 2, respectively, the first lead terminal 220 and the second lead terminal 230 can be easily positioned relative to the insulating substrate 2. Furthermore, when the grooves 27, 28 of the insulating substrate 2 each extend toward the opening of the recess 21, the first lead terminal 220 and the second lead terminal 230 can be easily inserted into the grooves 27, 28 of the insulating substrate 2, respectively. Therefore, according to the third embodiment, the assembly of the battery module 100B can be further improved.

[0085] As described above, the cylindrical battery 200 is accommodated in the recess 21 of the insulating substrate 2 with the first lead terminal 220 and the second lead terminal 230 bent. Therefore, the size of the recess 21 of the insulating substrate 2 can be reduced in plan view by the amount of bending of the first lead terminal 220 and the second lead terminal 230. Furthermore, when the first lead terminal 220 and the second lead terminal 230 are inserted into the grooves 27, 28 of the insulating substrate 2, respectively, the size of the recess 21 of the insulating substrate 2 can be further reduced in plan view by the amount of insertion of the first lead terminal 220 and the second lead terminal 230. As a result, according to the example of the third embodiment, the battery package 1B, in other words, the battery module 100B, can be made smaller.

[0086] When the first lead terminal 220 and the second lead terminal 230 are inserted into the grooves 27, 28 of the insulating substrate 2, respectively, the first lead terminal 220 and the second lead terminal 230 are less likely to come into contact with each other. As a result, according to the example of the third embodiment, it is possible to reduce the possibility of a short circuit between the first electrode 5B and the second electrode 6B.

[0087] When the first lead terminal 220 is joined to the first electrode 5B with the conductive bonding material J while the first lead terminal 220 is inserted inside the groove 27 of the insulating substrate 2, the bonding strength of the first lead terminal 220 to the first electrode 5B can be increased. When the second lead terminal 230 is joined to the second electrode 6B with the conductive bonding material J while the second lead terminal 230 is inserted inside the groove 28 of the insulating substrate 2, the bonding strength of the second lead terminal 230 to the second electrode 6B can be increased. Therefore, according to the example of the third embodiment, the connection reliability of the battery module 100B can be improved.

[0088] In particular, when the first electrode 5B and the second electrode 6B each extend up to the height position of the bottom surface of the recess 21 of the insulating substrate 2, the bonding area between the first lead terminal 220 and the first electrode 5B (the bonding area between the conductive bonding material J and the first electrode 5B) and the bonding area between the second lead terminal 230 and the second electrode 6B (the bonding area between the conductive bonding material J and the second electrode 6B) can be increased. This can further increase the bonding strength of the first lead terminal 220 to the first electrode 5B and the bonding strength of the second lead terminal 230 to the second electrode 6B. Therefore, according to the third embodiment, the connection reliability of the battery module 100B can be further improved.

[0089] When the first electrode 5B and the second electrode 6B each extend to the bottom surface of the recess 21 of the insulating substrate 2, the bonding area between the first lead terminal 220 and the first electrode 5B and the bonding area between the second lead terminal 230 and the second electrode 6B can be further increased. This increases the bonding strength of the first lead terminal 220 to the first electrode 5B and the bonding strength of the second lead terminal 230 to the second electrode 6B. Therefore, according to the third embodiment, the connection reliability of the battery module 100B can be improved.

[0090] When the first electrode 5B and the second electrode 6B are metal films located on the inner surfaces of the grooves 27, 28 of the insulating substrate 2, respectively, it is possible to increase the bonding area between the first electrode 5B and the insulating substrate 2 and the bonding area between the second electrode 6B and the insulating substrate 2. This increases the bonding strength of the first electrode 5B to the insulating substrate 2 and the bonding strength of the second electrode 6B to the insulating substrate 2. Therefore, according to the example of the third embodiment, it is possible to improve the long-term reliability of the battery module 100B.

[0091] In addition, the third embodiment also provides the above-described effects of avoiding short circuits due to dripping of the conductive bonding material J, hermetic sealing, the protrusions 22, and the step portions 23.

[0092] (Another aspect of the third embodiment) Another aspect of a battery package 1B and a battery module 100B according to the third embodiment will be described with reference to the cross-sectional view and plan view of Fig. 9. The cross-sectional view of Fig. 9 is a schematic cross-sectional view taken along line IX-IX in the plan view of Fig. 9. The plan view of Fig. 9 is a schematic plan view showing a battery module 100B according to another aspect of the third embodiment.

[0093] 9, the metal lid 10 may be joined to the frame-shaped metal film 91 by welding such as seam welding, direct seam welding, laser welding, or electron beam welding. Since joining using seam welding, direct seam welding, laser welding, or electron beam welding involves localized heating of the joining portion, the thermal impact on the battery 200 is smaller than when brazing joining is used, which involves overall heating (reflow heating).

[0094] 9 , in the battery module 100B, the first lead terminal 220 may be electrically connected to the first electrode 5B in a state where it is bent upward. The first lead terminal 220 may be electrically connected to the first electrode 5B in a state where it is bent multiple times and inserted into the groove 27 of the insulating substrate 2. The second lead terminal 230 may be electrically connected to the second electrode 6B in a state where it is bent upward. The second lead terminal 230 may be electrically connected to the second electrode 6B in a state where it is bent multiple times and inserted into the groove 28 of the insulating substrate 2.

[0095] As shown in the cross-sectional view and plan view of FIG. 9 , when the first lead terminal 220 is electrically connected to the first electrode 5B in a bent state, the first lead terminal 220 can be pressed against the first electrode 5B by its elastic force without using the conductive bonding material J. When the second lead terminal 230 is electrically connected to the second electrode 6B in a bent state, the second lead terminal 230 can be pressed against the second electrode 6B by its elastic force without using the conductive bonding material J. Therefore, the step of applying the conductive resin J can be omitted in the assembly process of the battery module 100B including the battery package 1B and the battery 200. Therefore, according to this other example of the third embodiment, the assembly of the battery module 100B can be further improved.

[0096] Battery 200 may be bonded to the bottom surface of recess 21 of insulating substrate 2 with a bonding material such as a resin adhesive. Battery 200 may also be fixed by being pressed against the inner wall surface of recess 21 of insulating substrate 2 by the elastic force of first lead terminal 220 and second lead terminal 230. If the elastic force (pressure contact force) of first lead terminal 220 and second lead terminal 230 is large, a bonding material for bonding battery 200 to the bottom surface of recess 21 of insulating substrate 2 can be omitted.

[0097] In other aspects of the third embodiment, the first lead terminal 220 may be joined to the first electrode 5B by the conductive bonding material J. The second lead terminal 230 may be joined to the second electrode 6B by the conductive bonding material J.

[0098] [Embodiment 4] A battery package 1C and a battery module 100C according to the fourth embodiment will be described with reference to the cross-sectional view and plan view of Fig. 10. The cross-sectional view of Fig. 10 is a schematic cross-sectional view taken along line XX in the plan view of Fig. 10. The plan view of Fig. 10 is a schematic plan view showing a battery module 100C according to the fourth embodiment.

[0099] As shown in the cross-sectional view and plan view of FIG. 10, the battery package 1C according to the fourth embodiment includes the battery package 1C according to the fourth embodiment and a cylindrical 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 components. The following describes the configuration of the battery package 1C according to the fourth embodiment that differs from the battery package 1 according to the first embodiment. For ease of explanation, the same reference numerals are used for components that have the same functions as those described in the first embodiment.

[0100] The battery package 1C includes a first electrode 5C located on the inner surface of the recess 21 of the insulating substrate 2, and the first electrode 5C corresponds to the first electrode 5 of the battery package 1. The first electrode 5C may extend in the horizontal direction. The first electrode 5C is made of the same metal powder metallization as the first external electrode 3, etc.

[0101] The battery package 1C includes a second electrode 6C located on the inner surface of the recess 21 of the insulating substrate 2, and corresponds to the second electrode 6 of the battery package 1. The second electrode 6C may extend in the horizontal direction. The first electrode 5C and the second electrode 6C may be aligned in the depth direction of the recess 21. The first electrode 5C and the second electrode 6C may extend in opposite directions. The second electrode 6C is made of the same metal powder metallization as the first external electrode 3, etc.

[0102] The first electrode 5C and the second electrode 6C are formed by printing, by screen printing or the like, at predetermined positions on ceramic green sheets for insulating layers, in the same manner as the first electrode 5. The surfaces of the first electrode 5C and the second electrode 6C that are exposed to the outside may be coated with a metal plating layer such as a nickel plating layer / gold plating layer by a plating method such as electrolytic plating or electroless plating.

[0103] The insulating substrate 2 may have a protrusion 22C located between the first electrode 5C and the second electrode 6C on the inner surface of the recess 21. In other words, the recess 21 of the insulating substrate 2 may have a protrusion 22 located between the first electrode 5C and the second electrode 6C on its inner surface. The protrusion 22C of the insulating substrate 2 may extend in the lateral direction. The recess 21 having the protrusion 22C is formed by subjecting a ceramic green sheet for the insulating layer to an appropriate punching process.

[0104] In the battery module 100C, the first lead terminal 220 may be electrically connected to the first electrode 5C in a state where it is bent laterally. The second lead terminal 230 may be electrically connected to the second electrode 6C in a state where it is bent laterally. The first lead terminal 220 and the second lead terminal 230 may be bent in the same direction, or may be bent in opposite directions as indicated by the two-dot chain lines in the example shown in FIG. 11 . The first lead terminal 220 may be joined to the first electrode 5C with a conductive bonding material J. The second lead terminal 230 may be joined to the second electrode 6C with a conductive bonding material J.

[0105] The technology applied to the battery package 1 according to another aspect of the first embodiment shown in FIG. 5 may be applied to the battery package 1C.

[0106] As shown in the cross-sectional and plan views of FIG. 10 , in a battery package 1C according to the fourth embodiment, the first electrode 5C and the second electrode 6C are located on the inner surface of the recess 21 of the insulating substrate 2. Therefore, when a cylindrical battery 200 is housed in the recess 21 of the insulating substrate 2 with the first lead terminal 220 and the second lead terminal 230 bent, the first lead terminal 220 and the second lead terminal 230 are electrically connected to the first electrode 5C and the second electrode 6C, respectively. This allows the cylindrical battery 200 to be mounted in the battery package 1C without adjusting the height of the joint between the first lead terminal 220 and the first electrode 5C and the joint between the second lead terminal 230 and the second electrode 6C. Therefore, according to the fourth embodiment, the assembly of a battery module 100C including the battery package 1C and the battery 200 can be improved.

[0107] Furthermore, as described above, the cylindrical battery 200 is housed in the recess 21 of the insulating substrate 2 with the first lead terminal 220 and the second lead terminal 230 bent. Therefore, the size of the recess 21 of the insulating substrate 2 can be reduced in plan view by the amount of bending of the first lead terminal 220 and the second lead terminal 230. As a result, according to the fourth embodiment, the battery package 1C, in other words, the battery module 100C can be made smaller.

[0108] If the first electrode 5C and the second electrode 6C are aligned in the depth direction of the recess 21, as described above, the conductive bonding material J may drip from the first electrode 5C to the second electrode 6C, potentially causing a short circuit between the first electrode 5C and the second electrode 6C. However, if the protrusion 22C is located between the first electrode 5C and the second electrode 6C on the inner surface of the recess 21 of the insulating substrate 2, the possibility of a short circuit between the first electrode 5C and the second electrode 6C due to the dripping of the conductive bonding material J can be reduced even if the first electrode 5C and the second electrode 6C are aligned in the depth direction of the recess 21.

[0109] Additionally, the fourth embodiment also provides the above-described effects relating to the hermetic sealing.

[0110] [Embodiment 5] A battery package 1D and a battery module 100D according to the fifth embodiment will be described with reference to the cross-sectional view and plan view of Fig. 11. The cross-sectional view of Fig. 11 is a schematic cross-sectional view taken along line XI-XI in the plan view of Fig. 11. The plan view of Fig. 11 is a schematic plan view showing a battery module 100D according to the fifth embodiment.

[0111] As shown in the cross-sectional view and plan view of FIG. 11, a battery package 1D according to the fifth embodiment includes a battery package 1D according to the fifth embodiment and a cylindrical 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 components. The following describes the configuration of the battery package 1D according to the fifth embodiment that differs from the battery package 1 according to the first embodiment. For ease of explanation, the same reference numerals are used for components that have the same functions as those described in the first embodiment.

[0112] The battery package 1D includes a first electrode 5D located on the inner surface of the recess 21 of the insulating substrate 2, and the first electrode 5D corresponds to the first electrode 5 of the battery package 1. The first electrode 5D may be a metal film located along the inner surface of a wide groove 27D that opens onto the inner surface of the recess 21 of the insulating substrate 2. The groove 27D of the insulating substrate 2 may extend in the horizontal direction and the depth direction of the recess 21. The groove 27D of the insulating substrate 2 may extend toward the opening side of the recess 21. The first electrode 5D may extend in the horizontal direction. The first electrode 5D and the second electrode 6D may extend in opposite directions. The first electrode 5D is made of the same metal powder metallization as the first external electrode 3, etc. The shape of the groove 27D of the insulating substrate 2 is not limited to a wide shape.

[0113] The battery package 1D includes a second electrode 6D located on the inner surface of the recess 21 of the insulating substrate 2. The second electrode 6D corresponds to the second electrode 6 of the battery package 1. The second electrode 6D may be a metal film along the inner surface of a wide groove 28D that opens to the inner surface of the recess 21 of the insulating substrate 2. The groove 28D of the insulating substrate 2 may extend horizontally and in the depth direction of the recess 21. The second electrode 6D may also extend horizontally. The groove 28D of the insulating substrate 2 may extend toward the opening side of the recess 21. The first electrode 5D and the second electrode 6D may be aligned horizontally. The second electrode 6D is made of the same metal powder metallization as the first external electrode 3, etc. The shape of the groove 28D of the insulating substrate 2 is not limited to a wide shape.

[0114] The grooves 27D, 28D of the insulating substrate 2 are formed by suitable punching of the ceramic green sheet for the insulating layer. The first electrode 5D and the second electrode 6D are formed on the inner surfaces of the grooves 27D, 28D of the insulating substrate 2, for example, by hole printing. The method for forming the first electrode 5D and the second electrode 6D is not limited to hole printing and may be, for example, coating, vapor deposition, or other techniques. The surfaces of the first electrode 5D and the second electrode 6D exposed to the outside may be coated with a metal plating layer such as a nickel plating layer or a gold plating layer by a plating method such as electrolytic plating or electroless plating.

[0115] The insulating substrate 2 may have a protrusion 22D located between the first electrode 5D and the second electrode 6D on the inner surface of the recess 21. In other words, the recess 21 of the insulating substrate 2 may have a protrusion 22D located between the first electrode 5D and the second electrode 6D on its inner surface. The protrusion 22D of the insulating substrate 2 may extend along the depth direction of the recess 21. The recess 21 having the protrusion 22D is formed by subjecting the ceramic green sheet for the insulating layer to an appropriate punching process. The battery package 1D may omit the protrusion 22D from the configuration of the insulating substrate 2.

[0116] As shown in the cross-sectional view of FIG. 11, the step 23 of the insulating substrate 2 may be located on the edge of the recess 21 closer to the opening of the recess 21 than the first electrode 5D and the second electrode 6D.

[0117] As shown in the cross-sectional view and plan view of FIG. 11 , in a battery module 100D, the first lead terminal 220 may be bent and inserted into a groove 27D of the insulating substrate 2 and electrically connected to the first electrode 5C. The second lead terminal 230 may be bent and inserted into a groove 28D of the insulating substrate 2 and electrically connected to the second electrode 6D. The first lead terminal 220 and the second lead terminal 230 may be bent in opposite directions. The first lead terminal 220 may be bonded to the first electrode 5D with a conductive bonding material J. The second lead terminal 230 may be bonded to the second electrode 6D with a conductive bonding material J.

[0118] As shown in the cross-sectional and plan views of FIG. 11 , in a battery package 1D according to the fifth embodiment, the first electrode 5D and the second electrode 6D are located on the inner surface of the recess 21 of the insulating substrate 2. Therefore, when a cylindrical battery 200 is housed in the recess 21 of the insulating substrate 2 with the first lead terminal 220 and the second lead terminal 230 bent, the first lead terminal 220 and the second lead terminal 230 are electrically connected to the first electrode 5D and the second electrode 6D, respectively. This allows the cylindrical battery 200 to be mounted in the battery package 1D without adjusting the height of the joint between the first lead terminal 220 and the first electrode 5D and the joint between the second lead terminal 230 and the second electrode 6D. Therefore, according to the fifth embodiment, the assembly of a battery module 100D including the battery package 1D and the battery 200 can be improved.

[0119] In particular, when the first lead terminal 220 and the second lead terminal 230 are inserted into the grooves 27D, 28D of the insulating substrate 2, respectively, the first lead terminal 220 and the second lead terminal 230 can be easily positioned with respect to the insulating substrate 2. Furthermore, when the grooves 27D, 28D of the insulating substrate 2 each extend toward the opening of the recess 21, the first lead terminal 220 and the second lead terminal 230 can be easily inserted into the grooves 27D, 28D of the insulating substrate 2, respectively. Therefore, according to the example of the fifth embodiment, the assembly of the battery module 100D can be further improved.

[0120] As described above, the cylindrical battery 200 is accommodated in the recess 21 of the insulating substrate 2 with the first lead terminal 220 and the second lead terminal 230 bent. Therefore, the size of the recess 21 of the insulating substrate 2 can be reduced in plan view by the amount of bending of the first lead terminal 220 and the second lead terminal 230. Furthermore, when the first lead terminal 220 and the second lead terminal 230 are inserted into the grooves 27D, 28D of the insulating substrate 2, respectively, the size of the recess 21 of the insulating substrate 2 can be further reduced in plan view by the amount of insertion of the first lead terminal 220 and the second lead terminal 230. As a result, according to the example of the fifth embodiment, the battery package 1B, in other words, the battery module 100B, can be reduced in size.

[0121] When the first lead terminal 220 and the second lead terminal 230 are inserted into the grooves 27D and 28D of the insulating substrate 2, respectively, the first lead terminal 220 and the second lead terminal 230 are less likely to come into contact with each other. As a result, according to the example of the fifth embodiment, it is possible to reduce the possibility of a short circuit between the first electrode 5D and the second electrode 6D.

[0122] When the first lead terminal 220 is inserted into the groove 27D of the insulating substrate 2 and joined to the first electrode 5D with the conductive bonding material J, the bonding strength of the first lead terminal 220 to the first electrode 5D can be increased. When the second lead terminal 230 is inserted into the groove 28D of the insulating substrate 2 and joined to the second electrode 6D with the conductive bonding material J, the bonding strength of the second lead terminal 230 to the second electrode 6D can be increased. Therefore, according to the example of the fifth embodiment, the connection reliability of the battery module 100D can be improved.

[0123] When the first electrode 5D and the second electrode 6D are metal films located on the inner surfaces of the grooves 27D and 28d of the insulating substrate 2, respectively, it is possible to increase the bonding area between the first electrode 5D and the insulating substrate 2 and the bonding area between the second electrode 6D and the insulating substrate 2. This increases the bonding strength of the first electrode 5D to the insulating substrate 2 and the bonding strength of the second electrode 6D to the insulating substrate 2. Therefore, according to the example of the fifth embodiment, it is possible to improve the long-term reliability of the battery module 100D.

[0124] In addition, the fifth embodiment also provides the above-described effects relating to the airtight sealing, the effects relating to the protrusion 22, and the effects relating to the step portion 23.

[0125] [Embodiment 6] A battery module 100E according to the sixth embodiment will be described with reference to the cross-sectional view and plan view of Fig. 12. The cross-sectional view of Fig. 12 is a schematic cross-sectional view taken along line XII-XII in the plan view of Fig. 12. The plan view of Fig. 12 is a schematic plan view showing a battery module 100E according to the sixth embodiment.

[0126] 12, a battery module 100E according to the sixth embodiment includes a battery package 1E according to the sixth embodiment and a laminated battery 300 mounted in the battery package 1E. The battery package 1E according to the sixth embodiment has the same configuration as the battery package 1 according to the first embodiment, except that the size of the recess 21 in the insulating substrate 2 corresponds to the size of the laminated battery 300.

[0127] The size of the recess 21 of the insulating substrate 2 in a plan view is slightly larger than the size of the battery body 310 of the battery 300 in a plan view. The depth of the recess 21 may be approximately the same as the thickness of the battery body 310 of the battery 300. The shape of the recess 21 of the insulating substrate 2 in a plan view is not limited to a rectangular shape and can be changed depending on the shape of the battery body 210 of the battery 300.

[0128] The laminated battery 300 may be bonded to the bottom surface of the recess 21 of the insulating substrate 2 with a bonding material such as a resin adhesive. The laminated battery 300 has a battery body 310 and a plate-shaped first lead terminal 320 and a plate-shaped second lead terminal 330 that protrude from one side of the battery body 310. The battery body 310 may have a rectangular shape in a plan view.

[0129] The first lead terminal 320 may be electrically connected to the first electrode 5 in a state where it is bent downward. The second lead terminal 330 may be electrically connected to the second electrode 6 in a state where it is bent downward. The first lead terminal 320 and the second lead terminal 330 may be bent so as to be pressed against the first electrode 5 and the second electrode 6 by elastic force, respectively. The first lead terminal 320 may be joined to the first electrode 5 by a conductive bonding material J such as solder or a conductive resin. The second lead terminal 330 may be joined to the second electrode 6 by a conductive bonding material J.

[0130] As shown in the cross-sectional view and plan view of FIG. 12 , in the battery package 1, the first electrode 5 and the second electrode 6 are located on the inner surface of the recess 21 of the insulating substrate 2. Therefore, when the laminated battery 300 is housed in the recess 21 of the insulating substrate 2 with the first lead terminal 220 and the second lead terminal 230 bent, the first lead terminal 320 and the second lead terminal 330 are electrically connected to the first electrode 5 and the second electrode 6, respectively. This allows the laminated battery 300 to be mounted in the battery package 1 without adjusting the height of the joint (connection) between the first lead terminal 320 and the first electrode 5 and the joint between the second lead terminal 330 and the second electrode 6. Therefore, according to the sixth embodiment, the assembly of a battery module 100E including the battery package 1 and the battery 300 can be improved.

[0131] Furthermore, as described above, the laminated battery 300 is housed in the recess 21 of the insulating substrate 2 with the first lead terminal 320 and the second lead terminal 330 bent into the recess 21. Therefore, the size of the recess 21 of the insulating substrate 2 can be reduced in plan view by the amount of bending of the first lead terminal 320 and the second lead terminal 330. As a result, according to the sixth embodiment, the battery package 1 can be made smaller, in other words, the battery module 100E can be made smaller.

[0132] In addition, the sixth embodiment provides the same effects as the first embodiment.

[0133] (Another aspect of the sixth embodiment) A battery module 100E according to another aspect of the sixth embodiment will be described with reference to Figures 13 and 14. Figures 13 and 14 are schematic plan views of a battery module 100E according to another aspect of the sixth embodiment.

[0134] As shown in the example in FIG. 13 , the insulating substrate 2 may have a second recess 26 that opens to the bottom surface of the recess 21. The second recess 26 of the insulating substrate 2 is a recess that can engage with a lower portion that is a part of the battery body 310 of the laminate-type battery 300. The shape of the second recess 26 of the insulating substrate 2 in a plan view may be, for example, rectangular. The inner surface of the second recess 26 of the insulating substrate 2 may be parallel to the thickness direction of the insulating substrate 2. The size of the second recess 26 of the insulating substrate 2 in a plan view corresponds to the size of the battery body 310 of the battery 300. The shape of the second recess 26 of the insulating substrate 2 in a plan view is not limited to a rectangular shape and can be changed depending on the shape of the battery body 310 of the battery 300.

[0135] The laminated battery 300 in the battery module 100E is housed in the recess 21 of the insulating substrate 2 with the lower part of the battery body 310 engaged with the second recess 26 of the insulating substrate 2. The laminated battery 300 may be bonded to the bottom surface of the second recess 26 of the insulating substrate 2 with a bonding material such as a resin adhesive.

[0136] 14 , when the insulating substrate 2 has the second recess 26, the laminated battery 300 can be easily positioned relative to the insulating substrate 2 by engaging the lower part of the battery body 310 with the second recess 26 of the insulating substrate 2. This makes it possible to further improve the ease of assembly of the battery module 100E according to another example of the sixth embodiment.

[0137] 14, when the first lead terminal 320 and the second lead terminal 330 protrude from both sides of the battery body 310, the first electrode 5 and the second electrode 6 may be located on opposing surfaces on the inner surface of the recess 21 of the insulating substrate 2. Furthermore, the first lead terminal 320 and the second lead terminal 330 may be bent in opposite directions to each other or in the same direction.

[0138] [Embodiment 7] A battery package 1F and a battery module 100F according to the seventh embodiment will be described with reference to the cross-sectional view and plan view of Fig. 15. The cross-sectional view of Fig. 15 is a schematic cross-sectional view taken along line XV-XV in the plan view of Fig. 15. The plan view of Fig. 15 is a schematic plan view showing a battery module 100F according to the seventh embodiment.

[0139] As shown in the cross-sectional view and plan view of FIG. 15, the battery package 1F according to the seventh embodiment includes the battery package 1F according to the seventh embodiment and a laminated battery 300 mounted in the battery package 1F. The battery package 1F according to the seventh embodiment has the same configuration as the battery package 1E, except for some components. The following describes the configuration of the battery package 1F according to the seventh embodiment that differs from the battery package 1E. For ease of explanation, the same reference numerals are used for components that have the same functions as those described in the sixth embodiment.

[0140] The battery package 1F includes a first electrode 5F located on the inner surface of the recess 21 of the insulating substrate 2. The first electrode 5F corresponds to the first electrode 5 of the battery package 1E. The first electrode 5F may be a metal film located along the inner surface of a wide groove 27F that opens on the inner surface of the recess 21 of the insulating substrate 2. The groove 27F of the insulating substrate 2 may extend along the depth direction of the recess 21. The groove 27F of the insulating substrate 2 may extend toward the opening side of the recess 21. The first electrode 5F may extend along the depth direction of the recess 21. The first electrode 5F may extend to the upper end of the groove 27F of the insulating substrate 2. The first electrode 5F may extend to the height position of the bottom surface of the recess 21 of the insulating substrate 2. The first electrode 5F is made of the same metal powder metallization as the first external electrode 3, etc. The shape of the groove 27F of the insulating substrate 2 is not limited to being wide.

[0141] The battery package 1F includes a second electrode 6F located on the inner surface of the recess 21 of the insulating substrate 2. The second electrode 6F corresponds to the second electrode 6 of the battery package 1E. The second electrode 6F may be a metal film along the inner surface of a wide groove 28F that opens to the inner surface of the recess 21 of the insulating substrate 2. The groove 28F of the insulating substrate 2 may extend along the depth direction of the recess 21. The groove 28F of the insulating substrate 2 may extend along the depth direction of the recess 21. The second electrode 6F may extend along the depth direction of the recess 21. The second electrode 6F may extend to the upper end of the groove 28F of the insulating substrate 2. The second electrode 6F may extend to the height position of the bottom surface of the recess 21 of the insulating substrate 2. The first electrode 5B and the second electrode 6B may be arranged horizontally. The second electrode 6F is made of the same metal powder metallization as the first external electrode 3, etc. The shape of the groove 28F of the insulating substrate 2 is not limited to a wide shape.

[0142] The grooves 27F, 28F of the insulating substrate 2 are formed by suitable punching of the ceramic green sheet for the insulating layer. The first electrode 5F and the second electrode 6F are formed on the inner surfaces of the grooves 27F, 28F of the insulating substrate 2, for example, by hole printing. The method for forming the first electrode 5F and the second electrode 6F is not limited to hole printing and may be, for example, coating, vapor deposition, or other techniques. The surfaces of the first electrode 5F and the second electrode 6F exposed to the outside may be coated with a metal plating layer such as a nickel plating layer or a gold plating layer by a plating method such as electrolytic plating or electroless plating.

[0143] As shown in the cross-sectional view and plan view of FIG. 15 , the insulating substrate 2 may have recesses 24F and 25F located on the bottom surface of the recess 21 at locations corresponding to the first electrode 5F and the second electrode 6F, respectively. The recess 24F of the insulating substrate 2 may hold a conductive bonding material J for bonding the first lead terminal 320 to the first electrode 5F (hereinafter referred to as the conductive bonding material J for the first lead terminal 320). The recess 25f of the insulating substrate 2 may hold a conductive bonding material J for bonding the second lead terminal 330 to the second electrode 6F (hereinafter referred to as the conductive bonding material J for the second lead terminal 330). The recesses 24F and 25F of the insulating substrate 2 are formed by applying an appropriate punching process to a ceramic green sheet for an insulating layer. The first electrode 5F may extend into the recess 24F of the insulating substrate 2. The second electrode 6F may extend to the inside of the recess 25F of the insulating substrate 2.

[0144] The first electrode 5F may extend to the inner surface of a recess 24F that is continuous with the inner surface of the recess 21 of the insulating substrate 2. The first electrode 5F may extend to the bottom surface of the recess 24F of the insulating substrate 2. The second electrode 6F may extend to the inner surface of a recess 25F that is continuous with the inner surface of the recess 21 of the insulating substrate 2. The second electrode 6F may extend to the bottom surface of the recess 25F of the insulating substrate 2.

[0145] 15 , in a battery module 100F, the first lead terminal 320 may be bent downward and inserted into the groove 27F of the insulating substrate 2 to be electrically connected to the first electrode 5B. The second lead terminal 230 may be bent downward and inserted into the groove 28 of the insulating substrate 2 to be electrically connected to the second electrode 6B. The first lead terminal 320 may be joined to the first electrode 5B by a conductive bonding material J. The second lead terminal 330 may be joined to the second electrode 6B by a conductive bonding material J.

[0146] The technology applied to the battery module 100E according to another aspect of the sixth embodiment shown in FIG. 3 may be applied to the battery module 100F.

[0147] As shown in the cross-sectional and plan views of FIG. 15 , in a battery package 1F according to the seventh embodiment, the first electrode 5F and the second electrode 6F are located on the inner surface of the recess 21 of the insulating substrate 2. Therefore, when a laminated battery 300 is housed in the recess 21 of the insulating substrate 2 with the first lead terminal 320 and the second lead terminal 330 bent, the first lead terminal 320 and the second lead terminal 330 are electrically connected to the first electrode 5F and the second electrode 6F, respectively. This allows the laminated battery 300 to be mounted in the battery package 1F without adjusting the height of the joint between the first lead terminal 320 and the first electrode 5F and the joint between the second lead terminal 330 and the second electrode 6F. Therefore, according to the seventh embodiment, the assembly of a battery module 100F including a battery package 1F and a battery 200 can be improved.

[0148] In particular, when the first lead terminal 320 and the second lead terminal 330 are inserted into the grooves 27F, 28F of the insulating substrate 2, respectively, the first lead terminal 320 and the second lead terminal 330 can be easily positioned with respect to the insulating substrate 2. Furthermore, when the grooves 27F, 28F of the insulating substrate 2 each extend toward the opening of the recess 21, the first lead terminal 320 and the second lead terminal 330 can be easily inserted into the grooves 27F, 28F of the insulating substrate 2, respectively. Thus, according to the seventh embodiment, the ease of assembly of the battery module 100F can be further improved.

[0149] As described above, the laminated battery 300 is accommodated in the recess 21 of the insulating substrate 2 with the first lead terminal 320 and the second lead terminal 330 bent. Therefore, the size of the recess 21 of the insulating substrate 2 can be reduced in plan view by the amount of bending of the first lead terminal 320 and the second lead terminal 330. Furthermore, when the first lead terminal 320 and the second lead terminal 330 are inserted into the grooves 27F, 28F of the insulating substrate 2, respectively, the size of the recess 21 of the insulating substrate 2 can be further reduced in plan view by the amount of insertion of the first lead terminal 320 and the second lead terminal 330. As a result, according to the seventh embodiment, the battery package 1F, in other words, the battery module 100F can be reduced in size.

[0150] When the first lead terminal 320 and the second lead terminal 330 are inserted into the grooves 27F, 28F of the insulating substrate 2, respectively, the first lead terminal 320 and the second lead terminal 330 are less likely to come into contact with each other. As a result, according to the seventh embodiment, the possibility of a short circuit between the first electrode 5F and the second electrode 6F can be reduced.

[0151] When the first lead terminal 320 is inserted into the groove 27F of the insulating substrate 2 and joined to the first electrode 5F with the conductive bonding material J, the bonding strength of the first lead terminal 320 to the first electrode 5F can be increased. When the second lead terminal 330 is inserted into the groove 28F of the insulating substrate 2 and joined to the second electrode 6F with the conductive bonding material J, the bonding strength of the second lead terminal 330 to the second electrode 6F can be increased. Therefore, according to the example of the seventh embodiment, the connection reliability of the battery module 100F can be improved.

[0152] In particular, when the first electrode 5F and the second electrode 6F extend to the bottom surfaces of the recesses 24F and 25F of the insulating substrate 2, the bonding area between the first lead terminal 320 and the first electrode 5F (the bonding area between the conductive bonding material J and the first electrode 5F) and the bonding area between the second lead terminal 330 and the second electrode 6F (the bonding area between the conductive bonding material J and the second electrode 6F) can be increased. This further increases the bonding strength of the first lead terminal 320 to the first electrode 5F and the bonding strength of the second lead terminal 330 to the second electrode 6F. Therefore, according to the seventh embodiment, the connection reliability of the battery module 100F can be further improved.

[0153] When the wiring layer of the first connection wiring 7 extends from the first electrode 5B side to the bottom surface of the recess 24F of the insulating substrate 2, the first lead terminal 320 is joined to the first electrode 5F and a part of the wiring layer of the first connection wiring 7. When the wiring layer of the second connection wiring 8 extends from the second electrode 6B side to the bottom surface of the recess 25F of the insulating substrate 2, the second lead terminal 330 is joined to the second electrode 6F and a part of the wiring layer of the second connection wiring 8. This increases the bonding strength of the first lead terminal 320 to the first electrode 5F and the bonding strength of the second lead terminal 330 to the second electrode 6F. Therefore, according to the seventh embodiment, the connection reliability of the battery module 100F can be improved.

[0154] When the first electrode 5F and the second electrode 6F are metal films located on the inner surfaces of the grooves 27F and 28F of the insulating substrate 2, respectively, it is possible to increase the bonding area between the first electrode 5F and the insulating substrate 2 and the bonding area between the second electrode 6F and the insulating substrate 2. This increases the bonding strength of the first electrode 5F to the insulating substrate 2 and the bonding strength of the second electrode 6F to the insulating substrate 2. Therefore, according to the seventh embodiment, it is possible to improve the long-term reliability of the battery module 100F.

[0155] When the insulating substrate 2 has the recesses 24F, 25F, the conductive bonding material J for the first lead terminal 320 and the conductive bonding material J for the second lead terminal 330 are less likely to come into contact with each other on the bottom surface of the recess 21 of the insulating substrate 2. As a result, according to the example of the seventh embodiment, it is possible to reduce the possibility of a short circuit between the first electrode 5F and the second electrode 6F due to the conductive bonding material J spreading on the bottom surface of the recess 21 of the insulating substrate 2.

[0156] In addition, the seventh embodiment provides the same effects as the sixth embodiment.

[0157] Other Embodiments The number of batteries 200 (300) housed in the recess 21 of the insulating substrate 2 is not limited to one, and may be multiple. A plurality of batteries 200 (300) may be housed in a single recess 21 of the insulating substrate 2, arranged side by side in the horizontal direction. In this case, multiple pairs of first electrodes 5 and second electrodes 6 are located on the inner surface of one recess 21. Alternatively, multiple recesses 21 may be located in the horizontal direction on the first surface 2a of the insulating substrate 2, and each of the multiple recesses 21 may house a battery 200 (300). In this case, the first electrode 5 and second electrode 6 are located on the inner surface of each recess 21 of the insulating substrate 2.

[0158] A battery control semiconductor element for controlling the battery 200 (300) may be housed in the recess 21 of the insulating substrate 2. The battery control semiconductor element 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 a coil and a capacitor may also be housed in the recess 21 of the insulating substrate 2. Such semiconductor elements and electronic components may be housed in a recess separate from the recess 21 that houses the battery 200 (300), for example, in a recess that opens to the second surface 2b of the insulating substrate 2.

[0159] The battery module 100 (100A to 100F) may include a desiccant that absorbs moisture. The desiccant may be located on the underside of the lid 10. The desiccant may be located between the inner surface of the recess 21 of the insulating substrate 2 and the outer surface of the battery body 210 (310). For example, silica gel or calcium chloride may be used as the desiccant. When the battery module 100 (100A to 100F) includes a desiccant, it is possible to suppress deterioration of the battery material of the battery 200 (300) due to chemical reactions with moisture.

[0160] As shown in the example in FIG. 16, the battery module 100 may include an elastic body 11 interposed between the lower surface of the lid body 10 and the upper surface of the battery body 210. The elastic body 11 may fix the battery 200 to the insulating substrate 2 by its elastic force. The battery modules 100A to 100F may also include an elastic body 11 interposed between the lower surface of the lid body 10 and the upper surface of the battery body 210 (310). The elastic body 11 may fix the battery 200 (300) to the insulating substrate 2 by its elastic force. The elastic body 11 may be a spring member such as a coil spring or a leaf spring, or may be made of rubber or the like.

[0161] The invention according to the present disclosure has been described above based on the drawings and examples. However, the invention according to the present disclosure is not limited to the above-described embodiments. In other words, the invention according to the present disclosure can be modified in various ways within the scope of the present disclosure, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the invention according to the present disclosure. In other words, it should be noted that a person skilled in the art would easily be able to make various modifications or corrections based on the present disclosure. It should also be noted that these modifications or corrections are included in the scope of the present disclosure. [Explanation of symbols]

[0162] 1 Battery package (battery package according to the first embodiment) 2. Insulating substrate 21 Recess 22 Protrusions 23 Step section 23f Step surface 24 depression 25 depression 26 Second recess 3 1st external electrode 4 2nd external electrode 5 1st electrode 6 Second electrode 7 First connection wiring 8 Second connection wiring 9 Frame 91 Frame-shaped metal membrane 92 Metal frame 10 Lid 100 Battery module (battery module according to the first embodiment) 200 Cylinder-shaped battery 210 Battery body 220 First lead terminal 230 Second lead terminal 1A Battery Package (Battery Package According to Second Embodiment) 27 Groove 28 Groove 5A 1st electrode 6A 2nd electrode 100A Battery Module (Battery Module According to Second Embodiment) 1B Battery package (battery package according to the third embodiment) 5B 1st electrode 6B 2nd electrode 100B Battery module (battery module according to the third embodiment) 1C Battery package (battery package according to the fourth embodiment) 22C protrusion 5C 1st electrode 6C 2nd electrode 100C Battery module (battery module according to the fourth embodiment) 1D Battery Package (Battery Package According to Fifth Embodiment) 22D protrusion 5D 1st electrode 6D 2nd electrode 100D Battery module (battery module according to the fifth embodiment) 1E Battery Package (Battery Package According to the Sixth Embodiment) 100E Battery module (battery module according to the sixth embodiment) 300 Laminated Battery 310 Battery body 320 First lead terminal 330 Second lead terminal 1F Battery package (battery package according to the seventh embodiment) 5F 1st electrode 6F 2nd electrode 100F Battery module (battery module according to the seventh embodiment)

Claims

1. an insulating substrate having a first surface, a second surface opposite to the first surface, and a recessed portion that opens to the first surface and has a bottom surface and an inner surface; a first external electrode located on the second surface; a second external electrode located on the second surface; a first electrode located on the inner surface of the recess and electrically connected to the first external electrode; a second electrode located on the inner surface of the recess and electrically connected to the second external electrode.

2. The battery package according to claim 1 , wherein the first electrode and the second electrode are aligned in a horizontal direction.

3. The battery package according to claim 2 , wherein the first electrode and the second electrode each extend to a height position equal to the bottom surface of the recess.

4. 3. The battery package according to claim 2, wherein the first electrode and the second electrode extend in opposite directions.

5. 3. The battery package according to claim 2, wherein the first electrode and the second electrode each extend from a center in the depth direction of the recess toward an opening of the recess.

6. 2. The battery package according to claim 1, wherein the first electrode and the second electrode are each a metal body filled in a groove that opens to the inner surface of the recess.

7. 2. The battery package according to claim 1, wherein the first electrode and the second electrode are each a metal film positioned along an inner surface of a groove that opens onto the inner surface of the recess.

8. The battery package according to claim 2 , wherein the first electrode and the second electrode extend from the inner surface onto the bottom surface of the recess.

9. The battery package according to claim 2 , wherein the insulating substrate has depressions located on the bottom surface of the recess at positions corresponding to the first electrode and the second electrode, respectively.

10. The battery package according to claim 9 , wherein the first electrode and the second electrode each extend to the inside of the recess.

11. The battery package according to claim 1 , wherein the insulating substrate has a protrusion located on the inner surface of the recess between the first electrode and the second electrode.

12. The battery package according to claim 5 , wherein the inner side surface on which the first electrode and the second electrode are located is inclined outward with respect to the depth direction of the recess.

13. The battery package according to claim 1 , further comprising a frame portion positioned on the first surface so as to surround the recess.

14. The battery package according to claim 13 , wherein the insulating substrate has a step at the edge of the recess, and a step surface of the step is located closer to the opening of the recess than the first electrode and the second electrode.

15. The battery package according to claim 1 , wherein the insulating substrate has a second recess that opens to the bottom surface of the recess.

16. 2. The battery package according to claim 1, wherein the insulating substrate is made of ceramics.

17. A battery package according to any one of claims 1 to 16; a cylindrical or laminated battery housed in the recess and having a first lead terminal electrically connected to the first electrode in a bent state, and a second lead terminal electrically connected to the second electrode in a bent state.

18. The battery package according to claim 7; a cylindrical or laminated battery housed in the recess, the battery having a first lead terminal that is bent and inserted into the groove and electrically connected to the first electrode, and a second lead terminal that is bent and inserted into the groove and electrically connected to the second electrode.

19. The battery module according to claim 17 , wherein the first lead terminal and the second lead terminal are bent by elastic force so as to be pressed against the first electrode and the second electrode, respectively.

20. The battery module according to claim 18 , wherein the first lead terminal and the second lead terminal are bent by elastic force so as to be pressed against the first electrode and the second electrode, respectively.

Images