JP2012221572A - Battery module and portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress battery capacity reduction due to thermal effect even when contactless power supply is adopted.SOLUTION: A battery module 1 comprises a core pack 11, a secondary-side coil antenna 12, and a heat-dissipating resin 13. The core pack 11 contains a battery. The secondary-side coil antenna 12 is arranged on the outer peripheral surface of the core pack 11, receives electric power supply in a contactless manner, and supplies the electric power to the battery. The heat-dissipating resin 13 covers the secondary-side coil antenna 12 and radiates heat generated from the secondary-side coil antenna 12 to the outside. Insulation filler having a thermal conductivity higher than that of the heat-dissipating resin is dispersed in the heat-dissipating resin 13.

Description

  The present invention relates to a battery module and a portable terminal.

  Non-contact power transmission technology is known. In recent years, non-contact power transmission techniques that use the principle of magnetic field / electric field resonance have been developed in addition to those that use the principle of electromagnetic induction. In a transmission technique using the principle of electromagnetic induction, a primary side coil antenna that transmits power and a secondary side coil antenna that receives power are used.

  When the portable terminal is supplied with electric power in a non-contact manner, it is necessary to arrange a secondary coil antenna on the portable terminal. The arrangement position of the secondary coil antenna is not particularly limited as long as it can be aligned with the primary coil antenna. However, since the secondary coil antenna generates heat due to energy loss during power reception, it is necessary to determine the arrangement position in consideration of the influence of heat on other components.

  Patent Document 1 discloses a heat transfer plate that is in contact with the surface of the battery and made of a material with good thermal conductivity, and a housing that contains the battery and the heat transfer plate and is made of a material with good thermal conductivity. Are disclosed (see FIG. 2 of Patent Document 1).

Japanese Patent Laid-Open No. 2001-313015

  Here, a case where the battery module is charged even when the battery module is removed from the portable terminal will be considered. FIG. 8 shows a reference example of a battery module in which a secondary coil antenna is arranged on the outer peripheral surface of the core pack.

  FIG. 8 is an external perspective view of the battery module 9. In the battery module 9 shown in FIG. 8, the secondary coil antenna 92 is arranged on the outer peripheral surface of the core pack 91, the top case 93 and the bottom case 94 are fitted to the core pack 91, and the whole is wound with the label 95. And fix. Thereby, even if it is the battery module 9 single-piece | unit, the secondary side coil antenna 92 can receive electric power from a primary side coil antenna (illustration omitted). Then, the secondary battery in the core pack 91 is charged by the power supplied from the secondary coil antenna 92.

  As described above, the secondary coil antenna 92 generates heat due to energy loss during power reception (for example, heat generation of a conductor due to current flowing through the coil). Since the label 95 is a member for fixing the position of the secondary coil antenna 92 with respect to the core pack 91, the heat dissipation is not taken into consideration at all, and the thermal conductivity is poor. Therefore, as shown in FIG. 8, when the secondary coil antenna 92 is disposed on the outer peripheral surface of the core pack 91, the secondary battery in the core pack 91 is affected by the heat generated from the secondary coil antenna 92. Receive. As a result, there arises a problem that the battery capacity of the secondary battery is reduced.

  Note that the battery module 9 shown in FIG. 8 is originally considered by the inventor of the present invention to explain the above-described problems, and is merely a reference example. Therefore, the above description including FIG. 8 does not constitute any prior art.

  In addition, the battery pack described in Patent Document 1 describes a technique for dissipating heat due to heat generated by the battery, and neither describes nor suggests a countermeasure against heat generation of the secondary coil antenna.

  The present invention has been made to solve such a problem, and an object of the present invention is to suppress a decrease in battery capacity due to thermal effects even when non-contact power feeding is employed.

  A battery module according to the present invention includes a battery housing member that houses a battery, a power supply member that is disposed on an outer peripheral surface of the electrical housing member, receives power supplied in a non-contact manner, and supplies the power to the battery. A heat-dissipating resin that is applied to the power supply member, covers the power supply member, and dissipates heat generated from the power supply member to the outside. Insulator filler having higher thermal conductivity than that is dispersed.

  According to the present invention, even when non-contact power feeding is employed, it is possible to suppress a decrease in battery capacity due to thermal effects.

1 is an external perspective view of a battery module according to a first embodiment. 1 is an external perspective view of a battery module according to a first embodiment. 1 is a cross-sectional view of a battery module according to a first embodiment. 1 is a cross-sectional view of a battery module according to a first embodiment. FIG. 3 is a diagram for explaining a charged state of the battery module according to the first embodiment. 3 is a flowchart for explaining a manufacturing method of the battery module according to the first exemplary embodiment; FIG. 6 is an external perspective view of a mobile terminal according to a second exemplary embodiment. It is an external appearance perspective view of the battery module concerning a reference example.

<Embodiment 1>
A first embodiment according to the present invention will be described. 1 and 2 are external perspective views of the battery module 1 according to the present embodiment. The battery module 1 includes a core pack 11, a secondary coil antenna 12, a heat radiating resin 13, a magnetic sheet 14, a control board 15, a connection portion 16, and a top case 17. The battery module 1 shown in FIG. 1 is in a state before the heat-dissipating resin 13 is applied. The battery module 1 shown in FIG. 2 is in a state after the top case 17 is fixed to the core pack 11 and the heat radiating resin 13 is applied. The battery module 1 is charged by supplying the power received by the secondary coil antenna 12 to the secondary battery in the core pack 11.

  Here, for convenience of explanation, “x-axis direction”, “y-axis direction”, and “z-axis direction” are defined in the figure. The “x-axis direction” is the width direction of the battery module 1 and is parallel to the main surface 111 a direction and the upper surface 111 b direction of the battery module 1. The “x-axis direction” is a direction orthogonal to the height direction and the thickness direction of the battery module 1. The “y-axis direction” is the height direction of the battery module 1 and is parallel to the main surface 111 a direction and the side surface 111 c direction of the battery module 1. The “y-axis direction” is a direction orthogonal to the width direction and the thickness direction of the battery module 1. The “z-axis direction” is the thickness direction of the battery module 1 and is parallel to the upper surface 111 b direction and the side surface 111 c direction of the battery module 1. The “z-axis direction” is a direction orthogonal to the width direction and the height direction of the battery module 1. That is, the “x-axis direction”, the “y-axis direction”, and the “z-axis direction” are orthogonal to each other.

  The core pack 11 (battery housing member) is a housing that houses a secondary battery. The core pack 11 has a flat plate shape, and the secondary coil antenna 12 is laminated on the main surface 111a.

  The secondary coil antenna 12 (power supply member) includes a power reception unit 121 formed of a winding and a wiring unit 122 that transmits power. The power receiving unit 121 is supplied with power in a non-contact manner from a primary coil antenna (not shown). There are two types of non-contact power transmission / reception that use the principle of electromagnetic induction and one that uses the principle of magnetic field / electric field resonance. Detailed description of the principle of transmission and reception is omitted. The wiring unit 122 sends the power received by the power receiving unit 121 to the secondary battery in the core pack 11.

  The heat dissipating resin 13 (hatched portion in FIG. 2) is applied to the secondary coil antenna 12 to cover the secondary coil antenna 12. The heat dissipating resin 13 dissipates heat generated from the secondary coil antenna 12 to the outside. Note that the outside means the ambient air when the battery module 1 is charged by itself. On the other hand, when charging is performed with the battery module 1 housed in the mobile terminal, the outside means a module housing portion of the mobile terminal.

  In the heat radiating resin 13, a filler having a higher thermal conductivity than the constituent resin of the heat radiating resin 13 is dispersed. The heat conductivity of the heat-dissipating resin 13 in which the filler is dispersed is preferably 0.8 (W / (m · K)) or more, for example. Specifically, the heat-dissipating resin 13 is produced by mixing an insulating filler such as alumina with high thermal conductivity into the resin. Thereby, it can prevent that the secondary side coil antenna 12 and the heat dissipation resin 13 are electrically connected, ensuring heat dissipation. As a result, the secondary coil antenna 12 and other electronic components can be prevented from being electrically connected via the heat radiating resin 13.

  The magnetic sheet 14 is disposed between the core pack 11 and the secondary coil antenna 12. That is, the secondary coil antenna 12 is disposed on the main surface 111 a of the core pack 11 via the magnetic sheet 14. The magnetic sheet 14 is a rectangular sheet whose one side is larger than the diameter of the power receiving unit 121. By providing the magnetic sheet 14, the influence of the magnetic flux used for electromagnetic induction from the core pack 11 can be reduced. Therefore, it is possible to prevent the communication quality from being lowered.

  The control board 15 (protective board) is a board on which a protection circuit for preventing overcurrent, overvoltage, overcharge, overdischarge and the like generated in the battery inside the core pack 11 is mounted. The control board 15 is a flat plate member extending in the y-axis direction, and is provided on the upper surface 111 b of the core pack 11. The control board 15 and the core pack 11 are connected by a connecting portion 16 (for example, a conductive resin bump). Further, on the upper surface of the control board 15, a terminal 151 for connecting to a portable terminal that houses the battery module 1 is provided.

  The top case 17 includes a flat plate member 171 and a claw portion 172. The size of the flat plate member 171 is substantially the same as the size of the upper surface 111 b of the core pack 11. Claw portions 172 are erected toward the core pack 11 at both ends in the x-axis direction of the flat plate member 171. The top case 17 is fixed to the upper end portion of the core pack 11 by fitting the claw portion 172 and the upper end portion of the core pack 11 together. By fixing the top case 17 on the control board 15, the control board 15 is protected from external force. The flat plate member 171 is provided with a rectangular opening 173 at a position corresponding to the terminal 151 of the control board 15. The opening 173 ensures the connection between the terminal 151 of the control board 15 and the mobile terminal 100.

  Next, sectional views of the battery module 1 shown in FIG. 2 are shown in FIGS. 3 is a cross-sectional view of the battery module 1 shown in FIG. 2 taken along line III-III. That is, FIG. 3 is a cross-sectional view in the z-axis direction. Further, FIG. 4 is a cross-sectional view taken along line IV-IV of the battery module 1 shown in FIG. That is, FIG. 4 is a cross-sectional view in the x-axis direction. In FIG. 3 and FIG. 4, the details inside the core pack 11 (configuration of the secondary battery, etc.) are omitted.

  As shown in FIGS. 3 and 4, the heat radiating resin 13 is applied to the entire outer peripheral surface of the battery module 1 except for the top case 17. That is, the core pack 11, the secondary coil antenna 12, and the magnetic sheet 14 are integrally sealed with the heat radiating resin 13. In other words, the laminated body in which the core pack 11, the magnetic sheet 14, and the secondary coil antenna 12 are laminated is covered with the heat radiating resin 13.

  The heat radiating resin 13 is also filled between the core pack 11 and the control board 15. Specifically, the heat dissipating resin 13 is filled in the gap 20 formed between the core pack 11 and the control board 15 by arranging the connection portion 16. Furthermore, the heat-dissipating resin 13 is also filled between the claw portion 172 of the top case 17 and the control board 15.

  Here, the structure which charges the battery module 1 concerning this Embodiment in the state accommodated in the portable terminal is demonstrated. FIG. 5 is a schematic cross-sectional view showing a state where the portable terminal 100 is placed on the upper surface of the charging stand 200. The mobile terminal 100 includes a hinge 101 and is a foldable mobile phone. In FIG. 5, the portable terminal 100 is in a folded state. The portable terminal 100 is placed on the upper surface of the charging stand 200 so that the positions of the primary coil antenna 201 provided on the charging stand 200 and the secondary coil antenna 12 of the battery module 1 are aligned. And according to control of the charge control board | substrate 202 provided in the charging stand 200, an electric current flows into the primary side coil antenna 201, and electric power generate | occur | produces in the secondary side coil antenna 12 by electromagnetic induction. The secondary battery in the core pack 11 is charged using the generated electric power.

  As described above, according to the configuration of the battery module 1 according to the present embodiment, the heat radiating resin 13 is applied to the secondary coil antenna 12 to cover the secondary coil antenna 12. Thereby, when the secondary coil antenna 12 generates heat due to charging, the generated heat is transmitted to the heat radiating resin 13. That is, the heat dissipating resin 13 dissipates heat generated from the secondary coil antenna 12 to the outside. As a result, it is possible to suppress the generated heat from being transmitted to the core pack 11. Therefore, even when non-contact power feeding is employed, the core pack 11 can be prevented from being affected by heat, and a decrease in battery capacity can be suppressed.

  Further, the heat radiating resin 13 covers substantially the entire outer peripheral surface of the core pack 11 in addition to the secondary coil antenna 12. Therefore, in addition to the heat generated by the secondary coil antenna 12, heat generated from the core pack 11 can be radiated. Therefore, the core pack 11 can be prevented from being affected by heat, and the battery capacity can be further prevented from decreasing. In addition, the heat dissipation effect can be heightened by making the material of the top case 17 into heat dissipation resin.

  In addition, a heat radiating resin 13 is also filled between the core pack 11 and the control board 15. Therefore, a heat radiation effect can be obtained also for the heat generating components of the control board 15, and the position of the control board 15 can be fixed to the core pack 11.

  The core pack 11, the secondary coil antenna 12, and the magnetic sheet 14 are integrally sealed with the heat radiating resin 13. Therefore, the position of the secondary coil antenna 12 and the magnetic sheet 14 can be fixed with respect to the core pack 11. That is, the battery module 1 does not need to include a label or a housing for fixing the position of the secondary coil antenna 12 and the magnetic sheet 14 to the core pack 11. As a result, the battery module 1 can be thinned. Further, since the position is not fixed by winding the label, it is sufficient that the heat-dissipating resin 13 has adhesion strength, and tensile strength is not required.

  However, in the present embodiment, the heat-dissipating resin 13 is applied to substantially the entire outer peripheral surface of the core pack 11, but the present invention is not limited to this. That is, if the heat-dissipating resin 13 covers at least a part of the power receiving unit 121 of the secondary coil antenna 12, a heat dissipation effect can be obtained. Further, if the heat dissipating resin 13 is applied from the core pack 11 to the power receiving unit 121, the power receiving unit 121 can be fixed in position relative to the core pack 11.

  Here, the manufacturing method of the battery module 1 according to the present embodiment will be described with reference to the flowchart shown in FIG. First, the battery inside the core pack 11 and the control board 15 are connected (step S101). Then, the magnetic sheet 14 is attached to the main surface of the core pack 11 using a double-sided tape or the like, and the secondary coil antenna 12 is attached to the surface of the magnetic sheet 14 (step S102). Further, the top case 17 is fitted into the upper portion of the core pack 11 (step S103).

  Next, the resin and an insulating filler having a high thermal conductivity such as alumina are kneaded to generate the heat-dissipating resin 13 (step S104). In addition, when heat dissipation resin 13 produces | generates time, after time passes, a filler will precipitate and the density | concentration of a filler will produce dispersion | variation. Therefore, it is preferable to generate the heat-dissipating resin 13 immediately before use or to generate the heat-dissipating resin 13 in advance and knead again immediately before use.

  Next, the heat dissipation resin 13 is applied to the core pack 11 (step S105). As a coating method, a dipping method in which the core pack 11 is immersed in the heat-dissipating resin 13 or a molding method in which the core pack 11 is arranged in a mold and the heat-dissipating resin 13 is poured is used. Of course, the coating method is not limited to the above method, and is arbitrary. For example, as shown in FIG. 8, a sheet-like heat-dissipating resin 13 is prepared, and the outer periphery of the laminate composed of the core pack 11, the secondary coil antenna 12, and the magnetic material sheet 14 is attached to the sheet-like heat-dissipating resin. 13 may be covered. Thereafter, heating or UV (Ultraviolet) irradiation is performed to dry and cure the heat-dissipating resin 13 (step S106). The battery module 1 can be manufactured by the above process.

<Embodiment 2>
A second embodiment according to the present invention will be described. In the present embodiment, the configuration of portable terminal 100 that houses battery module 1 described in the first embodiment will be described.

  FIG. 7 shows an external perspective view of the mobile terminal 100 according to the present embodiment. The mobile terminal 100 includes a module housing part 110 that houses the battery module 1. Note that the mobile terminal 100 also includes general configurations such as a display and operation buttons, but description of these configurations is omitted. Similarly to the mobile terminal 100 shown in FIG. 5, the mobile terminal 100 in FIG. 7 is also a foldable mobile phone.

  The module housing part 110 is provided on the back surface of the mobile terminal 100 and is composed of a rectangular recess that can house the battery module 1. Specifically, the rectangular shape is substantially the same shape as the main surface 111 a of the battery module 1. Further, the height (depth) of the module housing portion 110 is substantially the same as the thickness of the battery module 1.

  The bottom surface 1101 (shaded portion) of the module housing portion 110 is formed of a material having a higher thermal conductivity than a material (resin) constituting a casing of a general mobile terminal 100 such as a metal or a heat radiating resin 13. . When the battery module 1 is housed in the module housing portion 110, the heat dissipating resin 13 that covers the peripheral surface of the battery module 1 and the bottom surface 1101 come into contact with each other. Therefore, heat generated from the core pack 11 or the secondary coil antenna 12 is transmitted to the heat radiating resin 13 covering the battery module 1, and is transmitted from the heat radiating resin 13 to the bottom surface 1101 of the module housing portion 110. Thereby, the heat dissipation effect of the battery module 1 can be further enhanced. Of course, a heat dissipation effect can be obtained if at least one of the surfaces of the module housing portion 110 in contact with the battery module 1 is formed of metal or heat-dissipating resin 13.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed and combined without departing from the spirit of the present invention. For example, in Embodiments 1 and 2 described above, the coil antenna is used as the non-contact power receiving member. However, the present invention is not limited to this. In the case of a power transmission method using electric field resonance, the receiving member provided in the battery module may be an electrode.

DESCRIPTION OF SYMBOLS 1, 9 Battery module 11, 91 Core pack 12, 92 Secondary coil antenna 13 Heat radiation resin 14 Magnetic material sheet 15 Control board 16 Connection part 17, 93 Top case 18 Terminal 94 Bottom case 95 Label 100 Portable terminal 101 Hinge 110 Module housing part 121 Power receiving part 122 Wiring part 171 Flat plate member 172 Claw part 173 Opening part 200 Charging stand 201 Primary coil antenna 202 Charging control board

Claims (10)

A battery housing member containing the battery;
A power supply member that is disposed on the outer peripheral surface of the electrical housing member, receives power supply in a non-contact manner, and supplies the power to the battery;
A heat-dissipating resin that covers the power supply member and dissipates heat generated from the power supply member to the outside;
A battery module in which an insulating filler having higher thermal conductivity than the heat dissipating resin is dispersed in the heat dissipating resin. The power supply member includes a power receiving unit that receives power supply in a contactless manner, and a wiring unit that intervenes power supply from the power receiving unit to the battery,
The battery module according to claim 1, wherein the heat-dissipating resin covers the power receiving unit to fix the power receiving unit with respect to the battery housing member.   The battery module according to claim 1, wherein the heat-dissipating resin seals the battery housing member and the power supply member together.   The battery module according to any one of claims 1 to 3, wherein the heat dissipation resin has a thermal conductivity of 0.8 W / (m · K) or more. The battery housing member has a flat plate shape,
The battery module according to claim 1, wherein the power supply member is disposed on a main surface of the battery housing member. A protective substrate disposed on the outer peripheral surface of the electrical housing member;
The battery module according to any one of claims 1 to 5, wherein the heat-dissipating resin is filled between the battery housing member and the protective substrate.   The battery module according to claim 6, wherein the power supply member and the protective substrate are fixed to the battery housing member by the heat radiating resin. The power supply member is a coil antenna, and is disposed on the outer peripheral surface of the battery housing member via a magnetic body.
The heat-dissipating resin covers the coil antenna and the magnetic body, and positions the coil antenna and the magnetic body with respect to the battery housing member. Battery module. The battery module according to any one of claims 1 to 8,
A module housing portion in which the battery module is housed and at least one of the surfaces in contact with the outer peripheral surface of the battery module is formed of metal,
A mobile terminal comprising: The battery module according to any one of claims 1 to 8,
A module housing portion in which the battery module is housed and at least one of the surfaces in contact with the outer peripheral surface of the battery module is formed of the heat-dissipating resin;
A mobile terminal comprising:

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