JP2013196883A - Secondary battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a secondary battery module which enables a secondary battery to be charged non-contact and which is compactly built in whole to meet the need for downsized load equipment and further excels in dust- and water-proof performance, for improved reliability in a long period of use.SOLUTION: The secondary battery module comprises a secondary battery 1, a charge control circuit, a control circuit board 2, a case body 6 housing the foregoing, and an input/output terminal 7. A resonance circuit 11 of the charge control circuit includes a power receiving coil 5 and a resonance capacitor 15. The secondary battery 1, as well as a battery terminal 8 connected to the secondary battery 1, a buffer 4 to absorb an expansion deformation of the secondary battery 1 at charge time, a magnetic shield body 4, and the power receiving coil 5 are accommodated at multiple stages inside the case body 6. The case body 6 is composed of a case main body 30 provided with an assembly opening 31 and a lid 32 closing up the assembly opening 31. A terminal window 42 is opened in a flat surface of the lid 32, and the input/output terminal 7 is exposed through the terminal window to the outside of the case body 6.

Description

  The present invention relates to a secondary battery module in which a secondary battery and a non-contact charging structure are accommodated in a case.

  This type of battery module is known from Patent Document 1, for example. There, a battery pack is constituted by a battery pack main body that accommodates a secondary battery and a battery pack case that accommodates a receiving coil for non-contact charging. A power receiving terminal for supplying a charging current is provided on the peripheral side surface of the battery pack body. When the battery pack body is fitted in the battery pack case, the power receiving terminal is electrically connected to the non-contact charging structure of the battery pack case. It has come to be. Note that four secondary batteries are housed inside the battery pack body, and the battery pack is used as a power source for a mobile phone.

Japanese Unexamined Patent Publication No. 09-063655 (paragraph numbers 0010 to 0012, FIG. 1)

  According to the battery pack of Patent Document 1, the battery pack main body that houses the secondary battery and the battery pack case that houses the power receiving coil are configured to be detachable. After that, only the battery pack body can be attached to the mobile phone. However, when the secondary battery is contactlessly charged, the battery pack body needs to be assembled to the battery pack case, so that a series of operations during charging is troublesome. Moreover, it is easy to lose the battery pack case separated from the battery pack body after charging. Furthermore, since each of the battery pack body and the battery pack case is formed in a flat quadrangular shape, there is a risk that when the battery pack body is assembled in a dark place, the front, back, front, back, left and right are mistakenly assembled.

  When the secondary battery is configured as a battery pack, it is necessary to consider that the secondary battery expands and deforms during charging. However, the battery pack main body is damaged by absorbing the dimensional change of the four secondary batteries. In order to avoid such deformation, it is necessary to secure a spare space inside the battery pack main body, and the battery pack main body is enlarged to that extent, making it difficult to meet the demand for downsizing load devices. Further, there is room for improvement in that the structure of the battery pack is complicated and the dustproof and waterproof properties are difficult.

An object of the present invention is to provide a secondary battery module that includes a secondary battery and a non-contact charging structure and can charge the secondary battery in a non-contact manner.
An object of the present invention is to provide a secondary battery module that can be made compact as a whole and can be reduced in size, and that is excellent in dustproofness and waterproofness and can improve reliability during long-term use.

  The secondary battery module according to the present invention includes a secondary battery 1, a charge control circuit, a control board 2, a case body 6 that accommodates these members, and an input / output terminal 7 that is exposed on the outer surface of the case body 6. And. The resonance circuit 11 provided in the charge control circuit includes a power receiving coil 5 provided corresponding to the power feeding coil 13 of the charger 12 and a resonance capacitor 15 connected in parallel with the power receiving coil 5. The secondary battery 1, the buffer body 3 that absorbs expansion deformation of the secondary battery 1 during charging, and the power receiving coil 5 are housed in a multistage shape inside the case body 6.

  The magnetic shield body 4 is disposed between the buffer body 3 and the power receiving coil 5.

  The secondary battery 1 is configured as a button-type battery. The case body 6 includes a case body 30 having an assembly opening 31 and a lid body 32 that is assembled to the case body 30 and closes the assembly opening 31. A terminal window 42 is opened on the flat surface of at least one of the case main body 30 and the lid 32, and the input / output terminal 7 is exposed to the outer surface of the case body 6 through the terminal window 42. The configuration of the secondary battery 1 in the shape of a button battery means that the secondary battery 1 is configured as a button-type battery or a coin-type battery.

  The buffer body 3 is formed of an elastic material that is elastically deformable and excellent in heat insulation. The magnetic shield body 4 is formed of a ferrite sheet. The secondary battery 1 and the control board 2 are connected via a flexible printed board 21. The battery terminal 8 is printed on the flexible printed circuit board 21.

  The joint between the case body 30 and the lid body 32 is sealed with a first seal body 37 in a watertight manner. The facing portion between the terminal window 42 and the input / output terminal 7 is sealed in a watertight manner by the second seal body 44.

  The case main body 30 is formed in a tunnel cross-sectional shape, and an assembly opening 31 is opened in a flat portion thereof. A plurality of terminal windows 42 are opened in a lid 32 that closes the assembly opening 31. A plurality of input / output terminals 7 are provided on the control board 2 disposed on the inner surface of the lid 32.

  The assembly opening 31 opened in either the upper end wall or the lower end wall of the case body 30 is closed with a lid 32. A plurality of terminal windows 42 are opened on the peripheral surface of the case body 30 and one end wall of the case body 30, and the plurality of input / output terminals 7 are provided on the battery terminals 8 arranged facing the terminal window 42.

  The power receiving coil 5 is disposed on the inner surface of one end of the case body 30. A charging surface display 35 is provided on the outer surface of the end wall of the case body 30 facing the power receiving coil 5 to indicate that the power receiving coil 5 is disposed.

  The input / output terminal 7 includes a pair of power terminals 7a and a pair of communication terminals 7b.

  The battery terminal 8 is formed by printing the contact terminal 23 on each of the pair of upper and lower terminal pieces 22 of the flexible printed circuit board 21. The contact terminal 23 includes a main passage 24, a large number of branch conduction paths 25 branched from the main passage 24, and a circular contact 26 formed at a branch end portion of each branch conduction path 25.

  Since the secondary battery module according to the present invention is configured by housing the secondary battery 1, the control board 2, the buffer body 3, and the power receiving coil 5 in the case body 6, the case structure compared to the conventional battery pack. The secondary battery module can be further downsized. In addition, since the charging control circuit, the power receiving coil 5 constituting the resonance circuit, the resonance capacitor 15 and the like are arranged inside the case body 6, the secondary battery 1 can be charged in a non-contact state by the charger 12. . Since the buffer body 3 is elastically deformed during charging and the expansion deformation of the secondary battery 1 during charging can be absorbed, it is possible to prevent an excessive force from acting on the case body 6. Furthermore, during the discharge, the buffer body 3 expands and deforms following the contraction of the secondary battery 1, and the contraction deformation of the secondary battery 1 during the discharge can be absorbed. The buffer 3 also serves to prevent the heat generated in the power receiving coil 5 during charging from being conducted to the secondary battery 1.

  When the magnetic shield body 4 is disposed between the buffer body 3 and the power receiving coil 5, the inductance of the power receiving coil 5 is increased when non-contact charging is performed between the power feeding coil 13 and the power receiving coil 5 of the charger 12. Thus, the power receiving efficiency is improved, and the secondary battery 1 can be effectively charged in a shorter time. In addition, the electromagnetic shield action between the coils 13 and 5 can be blocked by the magnetic shield body 4 so that the secondary battery 1 can be prevented from generating heat.

  When the case body 6 is configured by the case body 30 and the lid body 32, the terminal window 42 is opened on the flat surface of the case body 6, and the input / output terminal 7 is exposed to the outside through the terminal window 42. The connection structure provided on the load device side corresponding to the output terminal 7 can be simplified. For example, when the terminal window 42 is opened on the curved surface of the case body 6, the connection structure on the load device side needs to be curvedly arranged along the curved surface of the case body 6. This is because the structure becomes complicated. Further, if the terminal window 42 is opened on the curved surface of the case body 6, the connection between the input / output terminal 7 and the load device side may be caused when the loading posture of the secondary battery module with respect to the load device is slightly shifted. The state of conduction with the structure tends to be uneven. However, when the terminal window 42 and the input / output terminal 7 are arranged on the flat surface of the case body 6, even if the loading posture of the secondary battery module with respect to the load device is slightly shifted, The conduction state with the connection structure on the load device side can be made uniform and stable.

  According to the buffer body 3 formed of an elastic material that can be elastically deformed and has excellent heat insulating properties, the buffer body 3 reliably blocks heat generated in the power receiving coil 5 from being transmitted to the secondary battery 1 during charging. The secondary battery 1 can be prevented from falling into an overheated state. When the magnetic shield body 4 is formed of a ferrite sheet and the battery terminal 8 is formed of a flexible printed circuit board 21, the thickness of the secondary battery module is reduced and the size is reduced by the thickness of the ferrite sheet and the flexible printed circuit board 21. Can contribute. Further, since the battery terminal 8 is printed on the flexible printed circuit board 21 that connects the secondary battery 1 and the control board 2, the elastic force of the buffer body 3 follows the expansion deformation and contraction deformation of the secondary battery 1. Thus, the battery terminal 8 can be moved, and the connection state of the battery terminal 8 can always be maintained in an appropriate state.

  When the joint between the case body 30 and the lid body 32 is sealed in a watertight manner by the first seal body 37, and the opposite portion between the terminal window 42 and the input / output terminal 7 is sealed in a watertight manner by the second seal body 44, Secondary battery module excellent in performance and waterproofness can be obtained, and in particular, a secondary battery module suitable for a load device requiring a waterproof function can be obtained. Moreover, the reliability when a secondary battery module is used over a long period of time can be improved by providing dustproofness and waterproofness.

  According to the secondary battery module in which the assembly opening 31 is opened in the flat portion of the case body 30 formed in the cross section of the tunnel, and the plurality of terminal windows 42 are opened in the lid 32 that closes the assembly opening 31. The position of the input / output terminal 7 of the module is clarified, and loading to the load device can always be performed properly. Further, since the plurality of terminal windows 42 are formed on the flat lid body 32, the terminal structure and the seal structure of the input / output terminal 7 can be simplified.

  When the assembly opening 31 is opened in the end wall of the case body 30, after all the interior parts are accommodated in the case body 30, the buffer body 3 can be elastically deformed by assembling the lid body 32 to the case body 30. . That is, since it is not necessary to hold the shock absorber 3 in an elastically deformed state in the process of housing each interior part in the case body 30, the secondary battery module can be assembled more simply and accurately. it can. Moreover, since the several terminal window 42 is opened in the surrounding surface of the case main body 30, and one end wall of the case main body 30, the position of the input / output terminal 7 of a secondary battery module can be clarified. When a secondary battery module is loaded into a load device in a dark place, the secondary battery module can be properly loaded into the load device without making a mistake in the front, back, front, back, left and right.

  If the charging surface display 35 is provided on the outer surface of the end wall of the case body 30 facing the power receiving coil 5, it can be clarified on which end wall of the secondary battery module the power receiving coil 5 is arranged. Therefore, the power receiving coil 5 is directly opposed to the power feeding coil 13 of the charger 12, and the secondary battery module can be reliably and appropriately charged by the charger 12.

  When the input / output terminal 7 is configured by the pair of power terminals 7a and the pair of communication terminals 7b, the charge state of the secondary battery 1 is achieved by performing communication between the charge control circuit and the load device via the communication terminal 7b. Or a discharge state can be managed appropriately. Further, by performing communication between the charger 12 and the charge control circuit, for example, when the charging of the secondary battery 1 is completed, the operation state of the charger 12 is stopped, and the secondary battery 1 is overcharged. Can be prevented.

  When the contact terminals 23 are printed and formed on each of the pair of upper and lower terminal pieces 22 of the flexible printed circuit board 21, the terminal pieces 22 follow the dimensional change when the secondary battery 1 expands or contracts with charge / discharge. Can be elastically deformed. Therefore, the positive and negative electrodes of the secondary battery 1 and the contact terminal 23 can always be maintained in an appropriate connection state. In addition, since the contact terminal 23 is constituted by the main passage 24, a large number of branch conduction paths 25, and the circular contact 26, the contact terminal 23 and the secondary battery 1 are contacted at a large number of locations via the contact 26. Can be made. Therefore, when the secondary battery 1 is expanded or deformed, the contact state between the contact terminal 23 and the secondary battery 1 is reliably prevented from being blocked, and the contact state can be stabilized.

It is a vertical side view of the secondary battery module according to the present invention. It is the perspective view which looked at the secondary battery module concerning the present invention from the bottom side. It is a cross-sectional plan view of the secondary battery module according to the present invention. 1 is an exploded perspective view of a secondary battery module according to the present invention. It is a circuit diagram which shows the outline of the secondary battery module and charger which concern on this invention. It is a perspective view of the secondary battery module which concerns on another Example. It is a vertical side view of the secondary battery module according to the embodiment of FIG. It is a top view of the secondary battery module concerning another example. It is a vertical side view of the secondary battery module according to the embodiment of FIG.

(Example) FIG. 1 thru | or FIG. 5 shows the Example of the secondary battery module which concerns on this invention. In the present invention, front / rear, left / right, and upper / lower follow the cross arrows shown in FIG. 1 and FIG. In FIG. 1, the secondary battery module includes a single secondary battery 1, a control board 2, a buffer body 3, a magnetic shield body 4, a power receiving coil 5, and a case body 6 that houses these members, The output terminal 7 exposed on the outer surface of the case body 6 and a charge control circuit are included. The secondary battery 1 is formed in the shape of a circular button battery, and battery terminals 8 are connected to the negative and positive electrodes on the upper and lower surfaces, respectively.

  In FIG. 5, the charge control circuit includes a resonance circuit 11, a rectifier circuit, a smoothing circuit, a protection circuit, and the like, and most of them are mounted on the control board 2. The resonance circuit 11 includes a power reception coil 5 that is electromagnetically coupled to the power supply coil 13 of the charger 12, a resonance capacitor 15 that is connected in parallel with the power reception coil 5, and the like. The charger 12 is provided with a power feeding coil 13, a control circuit 16, an oscillation circuit 17, a display LED 18, and the like. The high-frequency induced magnetic field emitted from the power supply coil 13 of the charger 12 acts on the power receiving coil 5 to generate an induced current. This current is full-wave rectified by a rectifier circuit, and the rectified current is predetermined by a smoothing circuit. After the voltage is adjusted, the secondary battery 1 is charged. As shown in FIG. 3, the control board 2 is composed of a component-embedded board, in which a first IC chip 2a dedicated to constitute a charge control circuit, a second IC chip 2b constituting a protection circuit, and the like are accommodated. is there. The resonant capacitor 15 is mounted on the inner surface of the control board 2.

  The buffer body 3 is made of an elastic material that is elastically deformable and has excellent heat insulation properties, such as polyurethane or silicone rubber. In this embodiment, the buffer body 3 is formed in a disk shape with a polyurethane sheet having a thickness of 0.5 to 1 mm so that the expansion deformation of the secondary battery 1 can be reliably absorbed by the buffer body 3. The diameter of the buffer 3 is set to be the same as or slightly smaller than the outer diameter of the secondary battery 1 so that the buffer 3 can be contained within the outline of the secondary battery 1.

The magnetic shield body 4 can be formed of a thin iron plate or a ferrite sheet. In this embodiment, a commercially available ferrite sheet is punched into a circular shape to form the magnetic shield body 4. By arranging the magnetic shield body 4 between the power receiving coil 5 and the battery, when power is transmitted between the power feeding coil 13 and the power receiving coil 5 of the charger 12, the inductance of the power receiving coil 5 is increased to increase the power receiving efficiency. Can be improved. Further, it is possible to avoid the electromagnetic induction effect between the coils 13 and 5 from reaching the secondary battery 1. The diameter of the magnetic shield body 4 is
Similar to the buffer 3, the outer diameter of the secondary battery 1 was set to be slightly smaller than this.

  The power receiving coil 5 is made of a bulk antenna that is formed by winding a copper wire with an insulating coating in a spiral pattern to form a thin disk. The outer diameter of the power receiving coil 5 is set to be the same as or slightly smaller than the diameter of the secondary battery 1, and the thickness dimension is 0.3 to 1 mm.

  The battery terminal 8 is formed of a flexible printed circuit board 21 and connects the secondary battery 1 and the control board 2. Specifically, the contact terminals 23 are printed on the pair of upper and lower terminal pieces 22 of the flexible printed circuit board 21, and each contact terminal 23 is connected to the positive electrode and the negative electrode of the secondary battery 1. The end is connected to the control board 2. In this embodiment, as shown in FIG. 3, the contact terminal 23 printed on the terminal piece 22 is branched from the main passage 24 formed linearly along the radial direction of the secondary battery 1 and the main passage 24. 9 branch conducting paths 25 and a circular contact 26 formed at the branch end of each branch conducting path 25.

  As described above, when the elastically deformable terminal piece 22 is provided with the contact terminal 23 composed of a large number of contacts 26, it follows the dimensional change when the secondary battery 1 expands or contracts with charge / discharge. Thus, the terminal piece 22 is elastically deformed, and the connection state between the positive and negative electrodes of the secondary battery 1 and the contact terminal 23 can be maintained properly. Further, since the contact terminal 23 and the secondary battery 1 can be brought into contact with each other at many places via the contact 26, when the secondary battery 1 expands or contracts, the contact terminal 23 and the secondary battery 1 The contact state with the battery 1 can be reliably prevented and the contact state can be stabilized.

  The case body 6 includes a case main body 30 formed in a tunnel cross-sectional shape, and a lid body 32 that closes an assembly opening 31 opened on a flat peripheral surface of the case main body 30. A seal recess 33 is formed in a circular shape on the inner surface of the assembly opening 31 of the case body 30, and a pair of engagement recesses 34 for fixing the lid body 32 is formed on the left and right walls near the inside. A charging surface display 35 is formed on the outer surface of the bottom wall of the case body 30 in a circular groove shape to indicate that the power receiving coil 5 is disposed. Holding ribs 36 are formed at two locations on the inner surface of the semicircular peripheral wall of the case main body 30 to receive the peripheral surface of the secondary battery 1 and restrict play. An endless rubber packing (first seal body) 37 that is in close contact with the seal recess 33 can seal the joint between the lid body 32 and the case body 30 attached to the assembly opening 31 in a watertight manner.

  The lid 32 has a rectangular plate wall 39 that is long on the left and right sides, a seal frame 40 that protrudes in a square shape on the inner surface of the plate wall 39, and a pair of engagement claws 41 that protrude on both left and right ends of the seal frame 40. Consists of. In the plate wall 39, four rectangular terminal windows 42 are opened at regular intervals, and a seal recess 43 is formed on the inner surface side thereof. With the sheet-like rubber packing (second seal body) 44 attached to the seal recess 43, the facing portion between the terminal window 42 and the input / output terminal 7 can be sealed in a watertight manner. By fitting the control board 2 between the pair of engaging claws 41, the control board 2 can be handled in an integrated state with the lid 32.

  The input / output terminal 7 is formed on the outer surface of the control board 2 disposed on the inner surface of the lid 32, and its outer shape is formed to be slightly larger than the opening shape of the inner surface of the terminal window 42. Of the four input / output terminals 7, two on the right side in FIG. 2 are power terminals 7a for charging / discharging, and two on the left side in FIG. 2 are between the load device and the secondary battery module. Is a communication terminal 7b for performing communication. By performing communication between the charge control circuit and the load device via the communication terminal 7b, the discharge state or the charge state of the secondary battery 1 can be properly managed. The sheet-like rubber packing 44 attached to the seal recess 43 seals the gap between the terminal window 42 and the control board 2 while being in close contact with the peripheral edge of the input / output terminal 7 and the control board 2.

  Each member constituting the secondary battery module is incorporated in the case body 30 as shown in FIGS. 1 and 3. In FIG. 1, the secondary battery 1 is accommodated in a state where the negative electrode faces the upper wall of the case body 30, and the buffer body 3, the magnetic shield body 4, and the power receiving coil 5 are arranged in the order of description on the positive electrode side. The secondary battery 1 in this state faces the upper wall of the case body 30 via the terminal piece 22 on the negative electrode side, and the lowermost receiving coil 5 is in close contact with the lower wall of the case body 30. The shock absorber 3 accommodated in the case main body 30 is elastically deformed, and the secondary battery 1 is pressed against the upper wall of the case main body 30 by the elastic force, and at the same time, the power receiving coil 5 is pressed against the lower wall of the case main body 30. Yes. Accordingly, the pair of contact terminals 23 are in close contact with the positive electrode and the negative electrode of the secondary battery 1. The contact terminal 23 may be in close contact with the positive electrode and the negative electrode of the secondary battery 1 via a paste-like or film-like conductive adhesive material.

  As described above, after each member is accommodated in the case main body 30, the engaging claw 41 is engaged with the engaging recess 34 by inserting the lid 32 assembled with the control board 2 into the assembling opening 31. Thus, the lid 32 can be integrated with the case main body 30. As shown in FIG. 3, the secondary battery 1 in this assembled state is held at two locations on the peripheral surface by the two holding ribs 36 and the inner surface of the control board 2. Therefore, it is described that the secondary battery 1 is subjected to an external force or an external impact to freely move in the radial direction inside the case body 30, and at the same time, the terminal piece 22 and the secondary battery 1 are relatively moved. The flexible printed circuit board 21 and the resonant capacitor 15 are accommodated using a triangular space surrounded by the secondary battery 1, the case body 30, and the control board 2.

  According to the secondary battery module configured as described above, after the secondary battery module is mounted on the charger 12 with the charging surface display 35 facing the feeding coil 13 of the charger 12, the charger 12 is operated. By doing so, the secondary battery 1 can be charged in a non-contact state. In the process of charging the secondary battery 1, the metal case of the secondary battery 1 expands in the thickness direction (vertical direction), but this dimensional change can be absorbed by the buffer 3 being compressed and deformed. Therefore, it is possible to reliably prevent the case wall from being deformed or damaged due to an excessive force acting on the upper and lower case walls of the case body 30. In addition, when a secondary battery module is loaded into a load device and the load device is operated with the power of the module, the metal case of the secondary battery 1 contracts, but this dimensional change causes the buffer 3 to expand and deform. Can be absorbed. Accordingly, it is possible to reliably prevent the secondary battery 1 from rattling due to discharge or the contact pressure between the battery terminal 8 and the positive electrode and the negative electrode of the secondary battery 1 from being insufficient, resulting in poor conduction.

  Since the secondary battery 1, the control board 2, the buffer body 3, the magnetic shield body 4, and the power receiving coil 5 are accommodated in the case body 6 to form a secondary battery module, compared to a conventional battery pack of this type. Thus, the secondary battery module can be made compact, and the demand for downsizing load devices can be met. Further, the space between the case body 30 and the lid 32 is sealed with a rubber packing 37, and further, the space between the terminal window 42 and the input / output terminal 7 is sealed with a sheet-like rubber packing 44. The reliability of long-term use can be improved by ensuring the dustproof and waterproof properties. Accordingly, the secondary battery module can be suitably applied as a power source for waterproof load equipment. The case body 6 is formed in a tunnel cross section, and the charging surface display 35 is formed on the lower surface of the case body 30. Therefore, when the secondary battery module is loaded into the load device, the front, back, front, back, left and right are loaded incorrectly. Therefore, the secondary battery module can always be properly loaded into the load device.

  6 and 7 show another embodiment of the secondary battery module according to the present invention. In this case, the case main body 30 is constituted by an incomplete circular peripheral wall 47 surrounding the periphery of the secondary battery 1 and a flat wall 48 connecting the end portions of the peripheral wall 47, and is opened in the lower end wall of the case main body 30. The assembled opening 31 was closed with a lid 32. In this embodiment, one of the four terminal windows 42 is opened near the top of the flat wall 48 and the remaining three terminal windows 42 are opened in the upper end wall of the case body 30. Further, the battery terminals 8 made of the flexible printed circuit board 21 are arranged on the inner surfaces of the terminal windows 42, and the input / output terminals 7 are formed on the outer surface of the flexible printed circuit board 21 facing the terminal windows 42. The control board 2 was formed in a circular shape and disposed between the secondary battery 1 and the buffer 3. The charging surface display 35 was formed on the lid body 32 constituting the bottom wall of the case body 6. Since others are the same as the previous embodiment, the same reference numerals are assigned to the same members, and descriptions thereof are omitted.

  As described above, when the assembly opening 31 is opened in the lower end wall of the case body 30, all the interior parts are sequentially accommodated in the case body 30, and finally the lid body 32 is inserted into the case body 30 and engaged. The buffer body 3 can be elastically deformed. Therefore, it is not necessary to hold the buffer body 3 in an elastically deformed state in the process of housing each interior part in the case body 30, and the secondary battery module can be assembled more easily and accurately. . Even in the case where the assembly opening 31 is opened in the upper end wall of the case body 30, the secondary battery module can similarly be assembled more simply and accurately.

  8 and 9 show still another embodiment of the secondary battery module according to the present invention. In this case, a circular terminal window 42 is formed on the upper surface of the circular case body 30, and the terminal window 42 is opened at one location on the peripheral surface of the case body 30, so that a circular shape is formed on the inner surface of the terminal window 42 on the upper surface side. A control board 2 was arranged. The input / output terminal 7 on the positive electrode side is formed on the upper surface of the control board 2, the terminal piece 22 of the flexible printed circuit board 21 is disposed on the inner surface of the terminal window 42 on the peripheral surface side of the case body 30, and the negative electrode is formed on the outer surface thereof. A side input / output terminal 7 was formed. The pair of input / output terminals 7 functions as power terminals 7a. The lid 32 is press-fitted and fixed to the assembly opening 31 of the case body 30, and the engagement recess 34, the engagement claw 41, the seal structure, and the communication terminal 7 b for fixing the lid 32 are omitted. In order to position the case body 6, positioning structures such as grooves, notches, ribs, and pins can be provided on the outer surface of the case body 30 or the lid body 32. Since others are the same as the previous embodiment, the same reference numerals are assigned to the same members, and descriptions thereof are omitted.

  In the secondary battery module described with reference to FIGS. 8 and 9, the case main body 30 is formed in a circular shape, and the upper surface and the peripheral surface of the case main body 30 are filled with corresponding connection terminals on the load device (hearing aid) side. Since the power terminal 7a for discharging is provided, the secondary battery module can be applied to the current load device to provide a power source. Further, the secondary battery module described with reference to FIGS. 6 and 7 can also be applied to an existing load device and used as a power source.

  In addition to the above embodiments, the shape of the case body 6 in plan view can be freely set such as a polygonal shape such as a quadrangle or a hexagon, an isosceles trapezoid, or a circle. The terminal window 42 can be formed on one end wall of the case body 6 or on both end walls. The input / output terminal 7 can be disposed on the surface of the case body 6 without the terminal window 42 interposed therebetween. The charging surface display 35 can be formed by printing characters or marks on the surface of the case body 6, or can be formed by sticking a label printed with characters or marks on the surface of the case body 6. By using the case body 30 and / or the lid body 32 as a circuit board, a rectifier circuit, a smoothing circuit, a protection circuit, etc. constituting the charge control circuit can be mounted on the case body 30 and / or the lid body 32. For example, the lid 32 described in FIG. 1 can be used as a circuit board, and each circuit can be mounted on the inner surface side.

  The secondary battery module can be configured by arranging a plurality of secondary batteries 1 inside the case body 6. The control board 2 does not have to be a component-embedded board, and may have a structure in which the first IC chip 2a and the second IC chip 2b are mounted on the surface of a normal board. The secondary battery 1 may be either a button-type battery or a coin-type battery, and may be a laminate-type battery. There may be at least one communication terminal 7b, which can be omitted when communication is not performed. The communication terminal 7b can be used as a terminal for monitoring a battery state such as a temperature state or a voltage state of the secondary battery 1.

  The heat of the power receiving coil 5 can be conducted to the case body 6 and radiated by using the magnetic shield body 4. For example, the heat of the power receiving coil 5 can be conducted to the case body 6 by forming the magnetic shield body 4 in a dish shape and bringing its peripheral wall into close contact with the case body 30. In this case, the magnetic shield body 4 may be made of a material having excellent magnetic shielding properties and thermal conductivity.

DESCRIPTION OF SYMBOLS 1 Secondary battery 2 Control board 3 Buffer body 4 Magnetic shield body 5 Power receiving coil 6 Case body 7 Input / output terminal 11 Resonance circuit 12 Charger 13 Feeding coil 15 Resonance capacitor 30 Case main body 32 Cover body 42 Terminal window

Claims (10)

Secondary battery (1), charge control circuit, control board (2), case body (6) for accommodating these members, and input / output terminal (7) exposed on the outer surface of case body (6) A secondary battery module comprising:
A resonance circuit (11) provided in the charge control circuit includes a power reception coil (5) provided corresponding to the power supply coil (13) of the charger (12), and a resonance capacitor connected in parallel with the power reception coil (5). (15) and
A secondary battery (1), a buffer body (3) that absorbs expansion deformation of the secondary battery (1) during charging, and a power receiving coil (5) are accommodated in a multistage manner inside the case body (6). And a secondary battery module.   The secondary battery module according to claim 1, wherein a magnetic shield body (4) is disposed between the buffer body (3) and the power receiving coil (5). The secondary battery (1) is configured as a button-type battery,
The case body (6) includes a case body (30) having an assembly opening (31) and a lid body (32) that is assembled to the case body (30) and closes the assembly opening (31). And
A terminal window (42) is opened on the flat surface of at least one of the case body (30) and the lid (32), and the input / output terminal (7) is connected to the case body (6) via the terminal window (42). The secondary battery module according to claim 1, wherein the secondary battery module is exposed on an outer surface. The shock absorber (3) is formed of an elastic material that is elastically deformable and excellent in heat insulation,
The magnetic shield body (4) is formed of a ferrite sheet,
The secondary battery (1) and the control board (2) are connected via the flexible printed board (21),
The secondary battery module according to claim 2 or 3, wherein the battery terminal (8) is printed on the flexible printed circuit board (21). The joint between the case body (30) and the lid body (32) is sealed in a watertight manner by the first seal body (37),
The secondary battery module according to claim 3 or 4, wherein a facing portion between the terminal window (42) and the input / output terminal (7) is sealed in a watertight manner by the second seal body (44). The case body (30) is formed in a tunnel cross-section, and the assembly opening (31) is opened in the flat portion thereof,
A plurality of terminal windows (42) are opened in the lid (32) that closes the assembly opening (31),
The secondary battery module according to any one of claims 3 to 5, wherein a plurality of input / output terminals (7) are provided on the control board (2) disposed on the inner surface of the lid (32). The assembly opening (31) opened to either the upper end wall or the lower end wall of the case body (30) is closed by the lid (32),
A plurality of terminal windows (42) are opened on the peripheral surface of the case body (30) and one end wall of the case body (30),
The secondary battery module according to any one of claims 3 to 5, wherein a plurality of input / output terminals (7) are provided on the battery terminal (8) arranged facing the terminal window (42). The power receiving coil (5) is disposed on the inner surface of one end of the case body (30),
The charging surface display (35) which displays that it is the side by which the receiving coil (5) is arrange | positioned is provided in the outer surface of the end wall of the case main body (30) facing a receiving coil (5). The secondary battery module according to any one of 7 above.   The secondary battery module according to any one of claims 3 to 8, wherein the input / output terminal (7) includes a pair of power terminals (7a) and a pair of communication terminals (7b). The battery terminal (8) is formed by printing the contact terminal (23) on each of the pair of upper and lower terminal pieces (22) of the flexible printed circuit board (21).
The contact terminal (23) has a circular shape formed at the main passage (24), a number of branch passages (25) branched from the main passage (24), and branch ends of the branch passages (25). The secondary battery module according to any one of claims 4 to 9, comprising a contact (26).

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