Substrate, package, and battery module

Abstract

The present invention reduces the height and lowers the cost of a battery module. A substrate on which a battery is mounted is provided with: a plurality of insulating layers; a heater located between the insulating layers; and a connection electrode electrically connected to the battery.

Description

Substrate, Package, and Battery Module

[0001] The present disclosure relates to a substrate, a package, and a battery module on which a battery is mounted.

[0002] In the field of modular solid-state batteries, a battery module including a heating unit for heating a battery element is known as the prior art. For example, the battery module described in Patent Document 1 includes a heating unit and a conductor unit for transmitting the heat of the heating unit to the battery element between the substrate and the battery.

[0003] International Publication No. WO2023 / 171759

[0004] A substrate according to an aspect of the present disclosure is a substrate on which a battery is mounted, and includes a plurality of insulating layers, a heater positioned between the insulating layers, and a connection electrode electrically connected to the battery.

[0005] A package according to an aspect of the present disclosure includes the above substrate and a lid body.

[0006] A battery module according to an aspect of the present disclosure includes the above package and a battery.

[0007] This is a cross-sectional view of a battery module according to Embodiment 1 of the present disclosure. This is a top view of a substrate according to Embodiment 1 of the present disclosure. This is a bottom view of a substrate according to Embodiment 1 of the present disclosure. This is a cross-sectional view of a battery module showing another embodiment of the first heater according to Embodiment 1. This is a top view of the substrate shown in Figure 4. This is a cross-sectional view of a battery module showing another embodiment of the first heater according to Embodiment 1. This is a top view of the substrate shown in Figure 6. This is a cross-sectional view of a battery module according to Embodiment 2 of the present disclosure. This is a top view of a substrate according to Embodiment 2 of the present disclosure. This is a bottom view of a substrate according to Embodiment 2 of the present disclosure. This is a cross-sectional view of a battery module according to Embodiment 3 of the present disclosure. This is a top view of a substrate according to Embodiment 3 of the present disclosure. This is a cross-sectional view of a battery module according to Embodiment 4 of the present disclosure. This is a top view of a substrate according to Embodiment 4 of the present disclosure. This is a top view of a substrate according to Embodiment 4 of the present disclosure. This is a top view of a substrate according to Embodiment 5 of the present disclosure. This is a cross-sectional view of a battery module according to Embodiment 6 of the present disclosure. This is a cross-sectional view of a battery module according to Embodiment 7 of the present disclosure. This is a substrate according to Embodiment 8 of the present disclosure, and is a top view of another embodiment of the substrate according to Embodiment 4. This is a substrate according to Embodiment 8 of the present disclosure, and is a top view of another embodiment of the substrate according to Embodiment 4.

[0008] In the field of modularized solid-state batteries, there is a demand for lower profile and reduced costs.

[0009] According to one aspect of this disclosure, it is possible to reduce the height and cost of battery modules.

[0010] Hereinafter, a battery package and battery module according to one embodiment of this disclosure will be described in detail with reference to the drawings. However, for the sake of clarity, the drawings referenced below may show only the components necessary to explain the embodiment in a simplified manner. In other words, the battery package and battery module according to each embodiment may include any components not shown in the drawings referenced. Furthermore, it should be noted that the dimensions of the components in each drawing do not faithfully represent the dimensions of the actual components or the dimensional ratios of each component.

[0011] In the following explanation, the lid side and the first surface of the substrate in the battery package may be referred to as the upper side, and the substrate side and the second surface of the substrate in the battery package may be referred to as the lower side. In the attached drawings, the vertical direction is indicated as the Z-axis direction. In addition, the vertical direction may be described as the height direction (thickness direction). This distinction between upper and lower is for convenience only and does not limit the actual orientation of the battery module when it is used. Also, in the following explanation, for convenience, the X-axis direction in the drawings may be described as the left-right direction.

[0012] [Embodiment 1] A battery module 900 according to Embodiment 1 will be described with reference to Figures 1 to 3. Figure 1 is a cross-sectional view of the battery module 900. The cross-section shown in Figure 1 corresponds to the cross-section viewed along line I-I in Figure 2. Figure 2 is a top view of the substrate 20 according to Embodiment 1. In Figure 2, the outlines of the first heater 31, heater wiring 43H, external electrode 42, and internal wiring 43 are shown by dashed lines when viewed from above. The mounting area R on which the battery 90 is mounted is shown by a dashed line. Figure 3 is a bottom view of the substrate 20. In Figure 3, the outlines of the first heater 31, heater wiring 43H, internal wiring 43, and connecting electrode 41 are shown by dashed lines when viewed from above. Hereinafter, the battery elements according to this disclosure may be simply referred to as batteries.

[0013] As shown in Figure 1, the battery module 900 comprises a package 100 and a battery 90. The package 100 comprises a substrate 20 and a lid 80. The package 100 houses the battery 90 and has external electrodes 42 that are connected to a mounting substrate such as a printed circuit board (PCB).

[0014] The battery 90 is an example of a battery element according to the present disclosure. The battery element according to the present disclosure may be, for example, a coin cell, a primary battery, a secondary battery, an electric double-layer capacitor, or an electric double-layer capacitor. Embodiment 1 describes the case in which the battery element is a battery 90 having electrode portions (positive electrode and negative electrode) on the left and right sides. The battery 90 may be, for example, a capacitor, which is an energy storage device. More specifically, the battery 90 may be, for example, an all-solid-state battery, a multi-layer ceramic capacitor (MLCC), a tantalum capacitor, or a film capacitor.

[0015] The substrate 20 comprises a base portion 21 having a mounting area R on which the battery 90 is mounted, and a frame portion 22 positioned on the base portion 21 surrounding the mounting area R. With this configuration, the substrate 20 can realize a structure having a housing recess for housing the battery 90. The substrate 20 has a housing recess for housing the battery 90, and the mounting area R is located on the bottom surface of the housing recess. The base portion 21 has a first surface 21T and a second surface 21B located opposite the first surface 21T. The mounting area R may be the area on the first surface 21T that overlaps with the battery 90 when viewed from above. That is, area R may be the area enclosed by the dashed line located inside the frame portion 22 in Figure 2. Alternatively, the mounting area R may be the area enclosed by imaginary lines connecting alignment marks (not shown) used when positioning the battery 90.

[0016] The substrate 20 includes a plurality of insulating layers L stacked in the thickness direction. The insulating layers L may be made of an insulating inorganic material. As shown in Figure 2, the plan view shape of the substrate 20 may be rectangular. The insulating layers L may be 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 plan view shape of the substrate 20 according to Embodiment 1 is substantially rectangular, but it may also be square or circular.

[0017] If the insulating layer L is made of, for example, an aluminum oxide sintered body, the substrate 20 is manufactured as follows. First, a ceramic green sheet to be made into the insulating layer L is manufactured. For example, multiple rectangular ceramic green sheets are manufactured by forming raw material powders such as aluminum oxide and silicon oxide into a sheet shape together with a suitable organic binder and an organic solvent. It is not necessary for all insulating layers L to be made from ceramic green sheets; the insulating layer L may also be made from ceramic paste.

[0018] Next, a laminate that will become the base portion 21 is fabricated by laminating these ceramic green sheets. Subsequently, a laminate that will become the frame portion 22 and a receiving recess are fabricated by laminating ceramic green sheets with through holes using a mold or the like. After that, the substrate 20 is fabricated by firing the laminate at a temperature of 1300 to 1600°C.

[0019] The substrate 20 is provided with wiring conductors 40 on its surface and internally. The wiring conductors 40 include connecting electrodes 41 that are electrically connected to the battery 90 and external electrodes 42 that are electrically connected to the mounting substrate. The wiring conductors 40 further include internal wiring 43 that connects the connecting electrodes 41 and the external electrodes 42. The internal wiring 43 may include, for example, through conductors that extend in the thickness direction of the substrate 20 and interlayer conductors located between the insulating layer L and extending along a plane parallel to the first surface 21T.

[0020] The connecting electrode 41 may have at least a portion of it located in the mounting area R. In Embodiment 1, the substrate 20 has two connecting electrodes 41. The two connecting electrodes 41 are each connected to different electrode portions of the battery 90. Both connecting electrodes are located on the first surface 21T of the base portion 21. As shown in Figure 1, the connecting electrodes 41 may extend from the first surface 21T to the interior of the substrate 20 (the boundary between the base portion 21 and the frame portion 22). The connecting electrodes 41 and the battery 90 may be electrically connected, for example, by a conductive bonding material B.

[0021] The external electrode 42 is located on the second surface 21B and is electrically connected to the battery 90 and the first heater 31, which will be described later. When the battery module 900 is mounted on a mounting board, the external electrode 42 is connected to an external electrical circuit via solder. The external electrode 42 is an example of a third external electrode according to this disclosure. More specifically, the substrate 20 has two external electrodes 42 on the second surface 21B, and each of the external electrodes 42 is connected to both one electrode of the battery 90 and one terminal of the first heater 31. In other words, the battery 90 and the first heater 31 are connected in parallel. By the battery 90 and the first heater 31 sharing the external electrode 42, even if the power supply from an external power source is interrupted, the heater can be heated by power supplied from the battery 90 for a certain period of time.

[0022] The wiring conductor 40 mainly contains metals such as tungsten, molybdenum, manganese, copper, silver, palladium, gold, platinum, nickel, or cobalt, or alloys containing these metals, as the conductive material. The connecting electrode 41 and the external electrode 42 are formed on the surface of the substrate 20 as a metal layer, such as a metallized layer or plating layer of the conductive material. The metal layer may be one layer or multiple layers. The interlayer conductor is formed inside the substrate 20 by metallization of the conductive material.

[0023] The connecting electrode 41, the external electrode 42, and the heater H can be formed, for example, by applying a metal paste prepared by mixing tungsten powder with an organic solvent and an organic binder to a predetermined position on the insulating layer L using a method such as screen printing, if the heating element is a tungsten metallized layer.

[0024] The heater H is formed between the insulating layers when the green sheets are laminated. To make the heater H highly resistant, the width of the heater pattern can be reduced. Alternatively, the resistance can be increased by incorporating ceramic powder into the metal paste that will become the heater H. The heater H located between the insulating layers can also be realized by applying a metal paste for the heater in the shape of a heater pattern onto the green sheet that will become the uppermost insulating layer of the base 21, and then applying a ceramic paste with the same ceramic composition as the insulating layer to cover the heater pattern. When manufactured in this way, after firing, the ceramic paste becomes an insulating film LC having the same composition as the insulating layer L (see Figure 19).

[0025] Alternatively, the through-conductor may be formed by creating through-holes at predetermined positions in the ceramic green sheet prior to printing the metal paste described above, and then filling these through-holes with the metal paste described above.

[0026] Furthermore, the exposed surface of the metallized layer after firing may be further coated with a plating layer of nickel and / or gold using electrolytic plating or electroless plating.

[0027] The first heater 31 is located between the insulating layers L that constitute the base 21, corresponding to the mounting area R. In other words, the first heater 31 is located overlapping with the mounting area R in a planar view. More specifically, at least a portion of the first heater 31 may be located in the area overlapping with the mounting area R in a planar view. As shown in the examples in Figures 1 and 2, the first heater 31 may overlap with the connecting electrode 41 in a planar view.

[0028] The first heater 31 is an example of a heater H according to this disclosure. A general characteristic of all-solid-state batteries is that when used at low temperatures, the ionic conductivity of the battery 90 decreases, and the charge and discharge speed slows down. The first heater 31 is for heating the battery 90. The first heater 31 may be a heater circuit pattern as shown in Figure 2. For example, the first heater 31 may be a pattern using a metal with high resistance, such as tungsten or molybdenum. The first heater 31 may be a meander pattern as shown in Figure 2, for example, and the distance between patterns may be about 0.05 mm to 0.2 mm. The distance between patterns and the width of the patterns can be arbitrarily adjusted depending on the area where the heater is placed and the required temperature conditions. By using a metal with high resistance or by reducing the distance between patterns, a first heater 31 that heats more easily can be realized.

[0029] The terminals of the first heater 31 can be connected to the external electrode 42 via heater wiring 43H. The heater wiring 43H may include, for example, through conductors and / or interlayer conductors. By integrating the first heater 31 into the substrate 20, the decrease in charge / discharge rate due to low temperatures can be reduced. In addition, the package 100 and battery module 900 can be made lower in height, and since there is no need to mount separate components such as a heating module, it also contributes to cost reduction. Furthermore, by arranging the first heater 31 on the base 21, the heater can be arranged over a wide area, thus enabling effective heating.

[0030] To improve the heating efficiency of the battery 90 by the first heater 31, the distance between the first heater 31 and the first surface 21T may be smaller than the distance between the first heater 31 and the second surface 21B. With this configuration, heat from the first heater 31 is more easily transferred to the first surface side where the battery 90 is located than to the second surface side which is connected to the outside. In addition, the external electrode 42 located on the second surface 21B is joined to the circuit electrode of the external substrate via solder or a conductive bonding material made of resin. Therefore, by making the distance between the first heater 31 and the second surface 21B greater than the distance between the first heater 31 and the first surface 21T, the thermal influence of the first heater 31 on the conductive bonding material can be reduced.

[0031] As shown in Figure 2, the first heater 31 may be positioned over the entire area overlapping with the mounting area R in a planar perspective view. The first heater 31 is connected by heater wiring 43H to internal wiring 43 (through conductor in Figure 2) that connects the connecting electrode 41 and the external electrode 42. By positioning the first heater 31 over the entire area overlapping with the mounting area R, the battery 90 is heated efficiently.

[0032] Figure 4 is a cross-sectional view of the battery module 900 showing another embodiment of the first heater 31. The cross-section shown in Figure 4 corresponds to the cross-section taken along the line IV-IV in Figure 5. Figure 5 is a top view of the substrate 20 shown in Figure 4.

[0033] In the examples shown in Figures 4 and 5, the first heater 31 is positioned overlapping with the mounting area R in a planar view. On the other hand, as shown in Figures 4 and 5, the first heater 31 may be positioned without overlapping with the connecting electrode 41 in a planar view. When mounting the battery 90, the battery 90 and the connecting electrode 41 can be joined by a bonding material B such as a conductive resin. Since the heater wiring 43H is composed of a metallization that is wider than the metallization corresponding to the first heater 31, the heater wiring 43H generates less heat than the first heater 31. By positioning the first heater 31 and the connecting electrode 41 without overlapping in a planar view, the deterioration of the bonding material B due to heat from the first heater 31 can be reduced.

[0034] Figure 6 is a cross-sectional view of the battery module 900 showing another embodiment of the first heater 31. The cross-section shown in Figure 6 corresponds to the cross-section taken along the line VI-VI in Figure 7. Figure 7 is a top view of the substrate 20 shown in Figure 6.

[0035] In the examples shown in Figures 6 and 7, the first heater 31 is positioned overlapping with the mounting area R in a planar view. On the other hand, as shown in Figures 6 and 7, the first heater 31 and heater wiring 43H may be positioned without overlapping with the connecting electrode 41 in a planar view. This configuration allows for a further reduction in the heat transferred from the first heater 31 and heater wiring 43H to the connecting electrode 41, thereby further reducing the deterioration of the bonding material B.

[0036] The cover 80 may close the opening of the housing recess in the substrate 20. The cover 80 may be made of metal. As shown in Figure 1, the cover 80 may be joined to a frame-shaped metal film M located on the upper surface of the frame portion 22. By closing the opening of the housing recess with the cover 80, the space surrounded by the cover 80 and the substrate 20 can be hermetically sealed or vacuum sealed. The cover 80 and the frame-shaped metal film M may be joined using a bonding material such as brazing material. In this case, the joining is performed by overall heating by reflow heating. Alternatively, direct seam welding, laser welding, or electron beam welding may be used to join the cover 80 and the frame-shaped metal film M.

[0037] As described above, the substrate 20 according to Embodiment 1 comprises a plurality of insulating layers L, a heater (e.g., a first heater 31) located between the insulating layers L, and a connecting electrode 41 that is electrically connected to the battery 90. The package 100 and the battery module 900 also include the substrate 20.

[0038] By incorporating a heater into the substrate 20, the decrease in the battery's charge and discharge speed in low-temperature environments can be reduced. Furthermore, because the heater is located between the insulating layers L, the package 100 and the battery module 900 can be made lower in profile. Additionally, since there is no need to mount a separate heating module for heating, this contributes to cost reduction.

[0039] Furthermore, in the package 100, a non-conductive resin may be filled between the package 100 and the battery 90. The non-conductive resin may be a material with a higher thermal conductivity than the space (air, vacuum). Filling the space between the package 100 and the battery 90 with a non-conductive resin makes heat conduction from the first heater 31 to the battery 90 more efficient. Alternatively, a filler (e.g., ceramic particles) with a higher thermal conductivity than the resin may be filled between the package 100 and the battery 90. This makes the thermal conductivity more efficient.

[0040] [Embodiment 2] Another embodiment of the present disclosure is described below. For convenience of explanation, components having the same function as those described in the above embodiment are denoted by the same reference numerals, and their descriptions are not repeated. The same applies to the following embodiments.

[0041] In Embodiment 2, the battery module 900A according to Embodiment 2 will be described using Figures 8 to 10. Figure 8 is a cross-sectional view of the battery module 900A. The cross-section shown in Figure 8 corresponds to the cross-section viewed along the line VIII-VIII in Figure 9. Figure 9 is a top view of the substrate 20A according to Embodiment 2. In Figure 9, the outer shape of the first heater 31 when viewed in plan view is shown by a dashed line. Figure 10 is a bottom view of the substrate 20A.

[0042] The battery module 900A comprises a package 100A and a battery 90. The package 100A comprises a substrate 20A and a cover 80. The substrate 20A has a base portion 21A and a frame portion 22. The base portion 21A has a first surface 21AT having a mounting area R and a second surface 21AB located opposite the first surface 21AT. The substrate 20A includes a plurality of insulating layers L.

[0043] The substrate according to this disclosure may have at least one recess 212 opening in the first surface 21AT, as in the substrate 20A according to Embodiment 2. The recess 212 may also be located between the first heater 31 and the connecting electrode 41 in a planar perspective view of the substrate 20A. For example, the substrate 20A has two recesses 212, and each recess 212 is located between the first heater 31 and the connecting electrode 41 in a planar perspective view. The length of the recess 212 in the Y-axis direction may be longer than the length of the connecting electrode 41 in the Y-axis direction. The recess 212 may also be to a depth such that there is a space between the first heater 31 and the connecting electrode 41 in a cross-section as shown in Figure 8. In other words, the depth of the recess 212 may be such that the straight line connecting the first heater 31 and the connecting electrode 41 in the shortest distance (shown as a dashed line in Figure 8) overlaps with the recess 212.

[0044] Since the substrate 20A has the recess 212 between the first heater 31 and the connection electrode 41 in a plan view, heat from the first heater 31 is less likely to be transmitted to the bonding material B, and deterioration of the bonding material B can be reduced.

[0045] As shown in FIG. 8, the first heater 31 may be located on the first surface 21AT side with respect to the plane including the bottom surface of the recess 212. With this configuration, the heat conduction path from the first heater 31 to the connection electrode 41 (the arrow shown by the two-dot chain line virtual line in FIG. 8) becomes longer and curved. Thereby, heat from the first heater 31 is less likely to be transmitted by the bonding material B. The first heater 31 may be located on the second surface 21AB side with respect to the plane including the bottom surface of the recess 212. Even with this configuration, since the recess 212 is located on the straight line connecting the first heater 31 and the bonding material B, heat from the first heater 31 is less likely to be transmitted to the bonding material B. Since the first heater 31 is located on the first surface 21AT side with respect to the plane including the bottom surface of the recess 212, heat transfer to the battery 90 can be improved while suppressing heat transfer to the bonding material B.

[0046] Further, the substrate according to the present disclosure may include, like the substrate 20A according to Embodiment 2, a first external electrode 42E electrically connected to the connection electrode 41 and a second external electrode 42H electrically connected to the heater H (for example, the first heater 31) on the second surface 21AB. In this case, the heater H can be warmed when the external power source is driven. Thereby, when the external power source is turned off, the temperature drop of the battery 90 can be reduced by the heat.

[0047] The first heater 31 and the second external electrode 42H may be connected via a heater wiring 43H that overlaps with the frame portion 22 in a plan view. In particular, since the through-conductor of the heater wiring 43H is located at a position overlapping with the frame portion, the through-conductor having a higher thermal conductivity than the substrate 20A is separated from the first heater 31, so that heat from the first heater 31 is less likely to be transmitted to the connection electrode 41 and the bonding material B. Further, the heater wiring 43H may include a plurality of through-conductors to reduce the wiring resistance.

[0048] On the other hand, as shown in FIGS. 8 and 9, the internal wiring 43 (through conductor) connecting the connection electrode 41 and the first external electrode 42E may be located within the accommodation recess in a plan view. Thereby, since the wiring path becomes shorter, the wiring resistance becomes smaller, and the power extraction efficiency can be improved.

[0049] [Embodiment 3] In Embodiment 3, the battery module 900B according to Embodiment 3 will be described with reference to FIGS. 11 and 12. FIG. 11 is a cross-sectional view of the battery module 900B. The cross-section shown in FIG. 11 corresponds to the cross-section taken along the line XI-XI in FIG. 12. FIG. 12 is a top view of the substrate 20B according to Embodiment 3. In FIG. 12, the first heater 31, the heater wiring 43H, and the through conductor 51 in a plan view are shown by broken lines.

[0050] The battery module 900B includes a package 100B and a battery 90. The package 100B includes a substrate 20B and a lid body 80. The substrate 20B has a base portion 21B and a frame portion 22. The base portion 21B has a first surface 21BT having a mounting region R and a second surface 21BB. The substrate 20B includes a plurality of insulating layers L.

[0051] The substrate according to the present disclosure may include a heat transfer member 50 located on the first surface 21BT like the substrate 20B according to Embodiment 3. The heat transfer member 50 is located overlapping the first heater 31 in a plan view.

[0052] The heat transfer member 50 may be a material with high thermal conductivity, for example, a conductive resin material, a metallized pattern, etc. Since the battery 90 is joined by the joining material B, there is a space between the battery 90 and the first surface 21BT. By disposing the heat transfer member 50 in the space, the heating efficiency of the battery by the heater can be improved.

[0053] Furthermore, the substrate according to this disclosure may have at least one through-conductor 51 extending from the first surface BT toward the heater surface direction where the first heater 31 is located, as in substrate 20B. The through-conductor 51 may be arranged so as not to overlap with the heater wiring of the first heater 31 in a planar perspective view. More specifically, as shown in Figure 12, the through-conductor 51 may be located between the meander-shaped wirings of the first heater 31 in a planar perspective view. The lower end of the through-conductor 51 may be located between the wirings of the first heater 31, or it may extend beyond the first heater 31 toward the second surface 21BB side. Alternatively, the through-conductor 51 may overlap with the first heater 31 in a planar perspective view. In that case, the through-conductor 51 and the first heater 31 are insulated by a thin insulating layer.

[0054] The through-conductor 51 is a conductor intended for heat conduction and is not electrically connected to the first heater 31. Heat is transferred from the vicinity of the first heater 31 toward the battery via the through-conductor with high thermal conductivity, thereby improving the heating efficiency of the battery by the first heater 31.

[0055] If the substrate according to this disclosure is equipped with a heat transfer member 50, as in substrate 20B, the through conductor 51 may be connected to the heat transfer member 50. This configuration further improves the heating efficiency of the battery by the first heater 31.

[0056] [Embodiment 4] In Embodiment 4, the battery module 900C according to Embodiment 4 will be described with reference to Figures 13 to 15. Figure 13 is a cross-sectional view of the battery module 900C. The cross-section shown in Figure 13 corresponds to the cross-section viewed along the line XIII-XIII in Figure 14. Figure 14 is a top view of the substrate 20C according to Embodiment 4. In Figure 14, the outlines of the first heater 31 and the second heater 32 when viewed from above are shown by dashed lines. Figure 15 is a top view of the substrate 20CX, which is another embodiment of the substrate 20C. In Figure 15, the outlines of the first heater 31 and the second heater 32X when viewed from above are shown by dashed lines.

[0057] The battery module 900C comprises a package 100C and a battery 90. The package 100C comprises a substrate 20C and a lid 80. The substrate 20C has a base portion 21C and a frame portion 22C. The base portion 21C has a first surface 21CT having a mounting area R and a second surface 21CB located opposite the first surface 21CT. The substrate 20C includes a plurality of insulating layers L. The substrate 20C may have various base portions described in other embodiments instead of the base portion 21C. Alternatively, the substrate 20C may have a base portion without the first heater 31 instead of the base portion 21C.

[0058] The substrate according to this disclosure may have a frame portion 22C composed of a laminate of a plurality of insulating layers L, as shown in the substrate 20C according to Embodiment 4. The substrate 20C has a second heater 32 located in the frame portion 22C. The second heater 32 is an example of a heater H according to this disclosure. The second heater 32 may also be a heater circuit pattern. The terminals of the second heater 32 may be connected to an external electrode 42, for example, via a through conductor and an interlayer conductor. By incorporating the second heater 32 into the frame portion 22, the battery 90 can be heated from the side, and the decrease in charge / discharge rate due to low temperature can be reduced.

[0059] The second heater 32 may be positioned around the entire circumference of the frame 22, as shown in Figure 14. By surrounding the battery 90 with the second heater 32, heating efficiency can be improved. Furthermore, since the entire circumference is heated uniformly by the second heater 32, and thermal expansion due to heating is uniform, the possibility of the package 100C being deformed by heat is reduced. This improves the reliability of hermetic sealing.

[0060] Specifically, as shown in Figure 14 for the second heater 32, a linear heater circuit pattern may be positioned around the entire circumference of the frame 22, and may be implemented by a pattern that extends around multiple circumferences. Alternatively, as shown in Figure 15 for the second heater 32X, a meandering heater circuit pattern may be positioned around the entire circumference of the frame 22.

[0061] The second heater 32 may be located closer to the upper surface than the lower surface of the frame portion 22C in the height direction. By positioning the second heater 32 at a distance from the joining material B, deterioration of the joining material B due to the second heater 32 can be reduced.

[0062] Furthermore, the substrate 20C is equipped with a first heater 31 on its base portion 21C. By providing both the first heater 31 and the second heater 32, the battery 90 can be heated more effectively.

[0063] (Another embodiment of Embodiment 4) Figure 16 is a top view of substrate 20CY, which is another embodiment of substrate 20C. Figure 17 is a top view of substrate 20CZ, which is another embodiment of substrate 20C. The substrates 20CY and 20CZ shown in Figures 16 and 17 are substrates in which the battery to be housed has a circular shape in plan view, and the battery electrodes are located vertically.

[0064] If the battery is circular in plan view, the inner edges of the frame portions 22CY and 22CZ in plan view may be circular. The second heaters 32Y and 32Z located in the frame portions 22CY and 22CZ, as in the substrates 20C and 20CX, may be positioned along the entire circumference, following the shape of the inner edges of the frame portions 22CY and 22CZ. This configuration allows the battery to be heated more efficiently.

[0065] The second heater 32Y shown in Figure 16 is positioned around the entire circumference of the frame 22CY, meandering in a zigzag pattern along the shape of the inner edge. This allows the total length of the second heater 32Y to be increased, thereby increasing the amount of heat generated.

[0066] The end of the second heater 32Y shown in Figure 16 is located near the center of the edge of the substrate 20CY. From the end of the second heater 32Y, the internal wiring 43, which is a through conductor, extends in the direction of the external electrode. On the other hand, the end of the second heater 32Z shown in Figure 17 is located at the corner of the substrate 20CZ. From the end of the second heater 32Z, the internal wiring 43, which is a through conductor, extends in the direction of the external electrode. Because the through conductor is located at the wide corner, the possibility of cracks forming in the frame portion 22CZ is reduced.

[0067] [Embodiment 5] In Embodiment 5, the battery module 900D according to Embodiment 5 will be described with reference to Figure 18. Figure 18 is a cross-sectional view of the battery module 900D.

[0068] The battery module 900D comprises a package 100D and a battery 90. The package 100D comprises a substrate 20C and a cover 80. The substrate 20C may have the same configuration as the substrate 20C of Embodiment 4.

[0069] The package according to this disclosure may have an elastic member 60 located inside the lid 80, as in the package 100D according to Embodiment 5. The elastic member 60 may be any elastic material, such as a leaf spring or disc spring, or an elastic resin. The battery 90 housed in the housing recess is pressed against the connecting electrode 41 by the elastic member 60, thus eliminating the need for a bonding material to join the connecting electrode 41 and the battery 90. By eliminating the need for a bonding material that is susceptible to degradation by heat, the long-term reliability of the package 100D can be improved.

[0070] If the elastic member 60 is conductive, it may be configured to contact the battery 90 at a position that does not short-circuit the electrodes of the battery 90, as shown in Figure 18. If the elastic member 60 is a metal spring, its surface may be covered with an insulating film. With this configuration, a short circuit will not occur even if the elastic member 60 contacts the electrodes of the battery 90. If the elastic member 60 is made of elastic resin, an insulating resin can be used.

[0071] [Embodiment 6] In Embodiment 6, the battery module 900E according to Embodiment 6 will be described with reference to Figure 19. Figure 19 is a cross-sectional view of the battery module 900E.

[0072] The battery module 900E comprises a package 100E and a battery 90. The package 100E comprises a substrate 20E and a lid 80. The substrate 20E comprises a base portion 21E and a frame portion 22. The substrate 20E may have a frame portion 22C having a second heater 32, as shown in Figure 18, instead of the frame portion 22. The base portion 21E has a first surface 21ET and a second surface 21EB.

[0073] The substrate according to this disclosure may have a second recess 213 opening to the second surface EB, as in the substrate 20E according to Embodiment 6. In a planar perspective view, at least a portion of the second recess 213 may be positioned overlapping with the first heater 31. The base portion 21E may further have a recess 212 on the first surface 21ET, as in the base portion 21A shown in Figure 8.

[0074] The presence of the second recess 213 provides a space within it, thereby improving heat retention. Furthermore, when the external electrode 42 is located on the second surface 21EB, heat from the first heater 31 is less likely to be transferred to the external electrode 42, thereby reducing the thermal impact on the mounting substrate.

[0075] [Embodiment 7] In Embodiment 7, the battery module 900F according to Embodiment 7 will be described with reference to Figure 20. Figure 20 is a cross-sectional view of the battery module 900F.

[0076] The battery module 900F comprises a package 100F, a battery 90F, and a conductive sheet 70. The package 100F comprises a substrate 20F and a lid 80. The substrate 20F comprises a base portion 21 and a frame portion 22F. The substrate 20F may have a base portion described in other embodiments instead of the base portion 21.

[0077] Battery 90F is an example of a battery element according to the present disclosure. Embodiment 7 describes a case in which the battery element is a battery 90F having electrode portions (positive electrode and negative electrode) on the top and bottom. Battery 90F may be, for example, an all-solid-state battery in which a negative electrode layer, an electrolyte layer, and a positive electrode layer are stacked. Alternatively, battery 90F may be a coin cell, a primary battery, or a secondary battery having electrode portions on the top and bottom. Battery 90F has an upper electrode and a lower electrode. Battery 90F may be cylindrical, prismatic, or have any other shape.

[0078] The substrate according to this disclosure may have connecting electrodes 41F, which are connected to the electrodes of the battery 90F, located on the upper surface of the base portion 21 and the upper surface of the frame portion 22F, respectively, as in the substrate 20F according to Embodiment 7. The frame portion 22F has a stepped surface that is lower than the surface to which the lid 80 is joined to the inner wall, and the connecting electrodes 41F located on the upper surface of the frame portion 22F may be located on this stepped surface.

[0079] The conductive sheet 70 is connected to the connecting electrode 41F located on the upper surface of the frame portion 22F and extends to the opening of the recess that houses the battery 90F. The conductive sheet 70 may be stretchable. Due to the stretchability of the conductive sheet 70, the battery 90F is pressed against the connecting electrode 41F located on the upper surface of the base portion 21. This eliminates the need for a bonding material to join the battery 90F and the connecting electrode 41F. By eliminating the need for a bonding material that is susceptible to degradation by heat, the long-term reliability of the package 100F can be improved.

[0080] [Embodiment 8] (Another embodiment of Embodiment 4) Figure 21 is a top view of substrate 20CA, which is another embodiment of substrate 20C shown in Figure 14. Substrate 20CA shown in Figure 21 differs from substrate 20C shown in Figure 14 in that the second heater 32 has a heater portion HT and a wiring conductor portion WC. The other configurations are the same as substrate 20C.

[0081] As shown in Figure 21, the substrate 20CA, the second heater 32, which is located around the entire circumference of the frame portion 22C, may have a heater portion HT and a wiring conductor portion WC. The heater portion HT is the portion that generates a large amount of heat and contributes to heating the battery 90. The wiring conductor portion WC is the wiring that connects the heater portions HT to each other and generates less heat than the heater portions HT. As shown in Figure 21, the substrate 20CA, in a planar perspective view, the portion of the second heater 32 where the connecting electrode 41 is located nearby may be the wiring conductor portion WC, which generates less heat than the heater portion HT. In other words, the heater portion HT of the second heater 32 may be located in a region that does not overlap with the region where the connecting electrode 41 is extended toward the outer edge of the substrate 20CA.

[0082] By positioning the wiring conductor portion WC close to the connecting electrode 41 and arranging the heater portion HT, which generates a large amount of heat, at a distance from the bonding material B, the deterioration of the bonding material B due to the second heater 32 can be reduced.

[0083] Figure 22 is a top view of substrate 20CXA, which is another embodiment of substrate 20CX shown in Figure 15. As shown in substrate 20CXA in Figure 22, in a planar perspective view, the heater density of the second heater 32X may be reduced in the portion where the connecting electrode 41 is located nearby. Also, in the region where the connecting electrode 41 is extended outward from the substrate, the distance between the second heater 32X and the connecting electrode 41 may be greater than the distance between the second heater 32X and the outer edge of the substrate.

[0084] By reducing the heater density of the second heater 32X located close to the connecting electrode 41, and / or increasing the distance between the connecting electrode 41 and the second heater 32X, the deterioration of the bonding material B by the second heater 32 can be reduced. Furthermore, by having the second heater 32X positioned around the entire circumference of the frame portion 22C, heating efficiency can be improved.

[0085] [Summary] (1) The substrate according to Embodiment 1 of the present disclosure is a substrate for mounting a battery, comprising a plurality of insulating layers, a heater located between the insulating layers, and a connecting electrode electrically connected to the battery.

[0086] (2) The substrate according to embodiment 2 of the present disclosure is composed of a laminate of the plurality of insulating layers as described in embodiment 1, and comprises a base having a first surface and a mounting area located on the first surface on which the battery is mounted, and the heater includes a first heater located between the plurality of insulating layers corresponding to the mounting area.

[0087] (3) The substrate according to embodiment 3 of the present disclosure is provided in embodiment 2 above with a frame portion located on the first surface that surrounds the mounting area.

[0088] (4) In the substrate according to embodiment 4 of the present disclosure, in embodiment 2 or 3, the first heater is positioned so as not to overlap with the connecting electrode in a planar perspective view.

[0089] (5) In any of embodiments 2 to 4, the substrate according to embodiment 5 of the present disclosure has a base portion having at least one recess opening to the first surface, the recess being located between the first heater and the connecting electrode in a planar perspective view.

[0090] (6) In the substrate according to embodiment 6 of the present disclosure, in embodiment 5, the first heater is located on the first surface side of the plane including the bottom surface of the recess.

[0091] (7) The substrate according to embodiment 7 of the present disclosure further comprises a heat transfer member located on the first surface in any of embodiments 2 to 6, wherein the heat transfer member is located overlapping with the first heater in a planar perspective view.

[0092] (8) The substrate according to embodiment 8 of the present disclosure has at least one through conductor extending from the first surface toward the heater surface direction in which the first heater is located, in any of embodiments 2 to 7.

[0093] (9) The substrate according to embodiment 9 of the present disclosure, in any of embodiments 3 to 8, comprises a frame portion located on the first surface surrounding the mounting area, the frame portion being composed of a laminate of the plurality of insulating layers, and the heater further comprises a second heater located on the frame portion.

[0094] (10) In the substrate according to embodiment 10 of the present disclosure, the second heater is located around the entire circumference of the frame portion in embodiment 9.

[0095] (11) The substrate according to embodiment 11 of the present disclosure further has a second recess opening to a second surface located opposite to the first surface in any of embodiments 2 to 10, and in plan view, at least a portion of the second recess is located overlapping with the first heater.

[0096] (12) The substrate according to embodiment 12 of the present disclosure comprises, in any of embodiments 2 to 11, a first external electrode located on a second surface opposite to the first surface and electrically connected to the connecting electrode, and a second external electrode located on the second surface and electrically connected to the heater.

[0097] (13) The substrate according to embodiment 13 of the present disclosure comprises a third external electrode located on a second surface opposite to the first surface and electrically connected to the connecting electrode and the heater, in any of embodiments 2 to 11.

[0098] (14) The substrate according to embodiment 14 of the present disclosure includes, in embodiment 1 above, a first surface, a base portion located on the first surface and having a mounting area on which the battery is mounted, and a frame portion located on the first surface surrounding the mounting area and composed of a laminate of the plurality of insulating layers, wherein the heater includes a second heater located on the frame portion.

[0099] (15) The package according to embodiment 15 of the present disclosure comprises a substrate according to any of embodiments 1 to 14 above, and a lid.

[0100] (16) The package according to embodiment 16 of the present disclosure has an elastic member located on the inside of the lid in embodiment 15.

[0101] (17) A battery module according to embodiment 17 of the present disclosure comprises the package of embodiment 15 or 16 and a battery element.

[0102] (18) In the battery module according to embodiment 18 of the present disclosure, a non-conductive resin is filled between the package and the battery element in embodiment 17.

[0103] (19) The battery module according to embodiment 19 of the present disclosure is, in embodiment 17 or 18, a solid-state battery, a coin cell, a primary battery, a secondary battery, an electric double-layer capacitor, or an electric double-layer capacitor having a negative electrode layer, an electrolyte layer, and a positive electrode layer stacked together.

[0104] [Additional Notes] The inventions described in this disclosure have been explained based on the drawings and embodiments. However, the inventions described in this disclosure are not limited to the embodiments described above. That is, the inventions described in this disclosure can be modified in various ways within the scope shown in this disclosure, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the inventions described in this disclosure. In other words, it should be noted that it is easy for those skilled in the art to make various modifications or alterations based on this disclosure. Furthermore, it should be noted that these modifications or alterations are included in the scope of this disclosure.

[0105] 100, 100A, 100B, 100C, 100D, 100E, 100F... Package 20, 20A, 20B, 20C, 20CX, 20CY, 20CZ, 20E, 20F, 20CA, 20CXA... Substrate 21, 21A, 21B, 21C, 21E... Base 22, 22C, 22F, 22CY, 22CZ... Frame 31... First heater 32, 32X, 32Y, 32Z... Second heater 40... Wiring conductor 41, 41F... Connecting electrode 42... External electrode (Third external electrode) 42E... First external electrode 42H... Second external electrode 43... Internal wiring 50... Heat transfer component 51... Through conductor 60... Elastic component 70... Conductive sheet 80... Cover 90, 90F...Battery 212...Recess 213...Second recess 900, 900A, 900B, 900C, 900D, 900E, 900F...Battery module

Claims

1. A substrate for mounting a battery, comprising: a plurality of insulating layers; a heater located between the insulating layers; and a connecting electrode electrically connected to the battery.

2. The substrate according to claim 1, comprising a base having a first surface and a mounting area located on the first surface on which the battery is mounted, wherein the heater includes a first heater located between the plurality of insulating layers corresponding to the mounting area.

3. The substrate according to claim 2, wherein the first surface is provided with a frame portion that surrounds the mounting area.

4. The substrate according to claim 2 or 3, wherein the first heater is positioned so as not to overlap with the connecting electrode in a planar perspective view.

5. The substrate according to any one of claims 2 to 4, wherein the base portion has at least one recess opening to the first surface, the recess being located between the first heater and the connecting electrode in a planar perspective view.

6. The substrate according to claim 5, wherein the first heater is located on the first surface side of the plane including the bottom surface of the recess.

7. The substrate according to any one of claims 2 to 6, further comprising a heat transfer member located on the first surface, wherein the heat transfer member is positioned to overlap with the first heater in a planar perspective view.

8. The substrate according to any one of claims 2 to 7, having at least one through conductor extending from the first surface toward the heater surface direction in which the first heater is located.

9. The substrate according to any one of claims 3 to 8, wherein the frame portion is composed of a laminate of the plurality of insulating layers, and the heater further includes a second heater located in the frame portion.

10. The substrate according to claim 9, wherein the second heater is located around the entire circumference of the frame portion.

11. The substrate according to any one of claims 2 to 10, further having a second recess opening to a second surface located opposite the first surface, wherein in a planar perspective view, at least a portion of the second recess is located overlapping with the first heater.

12. A substrate according to any one of claims 2 to 11, comprising: a first external electrode located on a second surface opposite to the first surface and electrically connected to the connecting electrode; and a second external electrode located on the second surface and electrically connected to the heater.

13. The substrate according to any one of claims 2 to 11, further comprising a third external electrode located on a second surface opposite to the first surface and electrically connected to the connecting electrode and the heater.

14. The substrate according to claim 1, comprising a first surface, a base portion located on the first surface and having a mounting area on which the battery is mounted, and a frame portion located on the first surface surrounding the mounting area and composed of a laminate of the plurality of insulating layers, wherein the heater includes a second heater located on the frame portion.

15. A package comprising a substrate according to any one of claims 1 to 14 and a lid.

16. The package according to claim 15, further comprising an elastic member located on the inside of the lid.

17. A battery module comprising the package according to claim 15 or 16 and a battery element.

18. The battery module according to claim 17, wherein a non-conductive resin is filled between the package and the battery element.

19. The battery module according to claim 17 or 18, wherein the battery element is an all-solid-state battery, a coin cell, a primary battery, a secondary battery, an electric double-layer capacitor, or an electric double-layer capacitor having a negative electrode layer, an electrolyte layer, and a positive electrode layer stacked together.

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