JP6160202B2 - Battery module - Google Patents

Description

  The present invention relates to a battery module.

  Conventionally, a thin battery having a power generation element formed by alternately laminating positive and negative electrodes with separators interposed therebetween, an electrode tab connected to the power generation element, and an exterior material in which the power generation element is accommodated and the outer periphery is joined The configuration is known. The thin battery is laminated to form a battery module.

  By the way, the thin battery generally has a low rigidity because the exterior body is formed of a flexible sheet-like member. Therefore, in the manufacturing process of the battery module, careful handling is required for handling the thin battery, and the working efficiency has been lowered.

  Therefore, there is a configuration of an electric module in which the outer peripheral edge of a laminated battery corresponding to a thin battery is held by a fixture corresponding to a frame member. According to such a configuration, since the battery module can be manufactured without depending on the rigidity of the thin battery, the working efficiency is improved (see, for example, Patent Document 1).

Utility Model Registration No. 3169585

  However, in the configuration of Patent Document 1, the thin battery in the battery module holds the outer peripheral edge of the exterior material that houses the power generation element with the frame member. In such a configuration, when the battery module is used in an environment with a lot of vibration such as mounting on a vehicle or the like, excessive stress is applied to the outer peripheral edge of the exterior material. As a result, the strength of the outer peripheral edge of the exterior material may decrease with time, and the life of the battery module may be reduced.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a battery module that can prevent damage to an exterior material that houses a power generation element.

In order to achieve the above object, a battery module of the present invention has a plurality of thin batteries and a frame member. The plurality of thin batteries include a power generation element formed by alternately stacking positive electrodes and negative electrodes via separators, an electrode tab electrically connected to an end of the power generation element, and a power generation element housed inside the electrode tab And a flexible exterior material joined to the outer peripheral edge in a state of being led out to the outside, and are laminated in a state of being separated from each other. The frame member has a main body part that holds the outer peripheral edges of adjacent thin batteries in a separated state, and an outer packaging material that extends from the main body part to a position where the power generation element is disposed in the gap between the adjacent thin batteries. And an extending portion that abuts each other. Frame member is a outer quadrangular frame-shaped body having a through hole along the stacking direction of the thin battery on the side of the center of the thin battery than extending portion, one body and the main body portion and the extending portion is Molded. A through-hole is located in the part in which the electric power generation element is arrange | positioned. The extending portion holds the power generation element via the exterior material.

  According to the battery module of the present invention, the outer peripheral edge of the thin battery is held by the main body portion of the frame member, and the power generation element is held by the extending portion of the frame member via the exterior material. Therefore, even if vibration is applied to the thin battery from the outside, the movement of the power generation element in the thin battery can be suppressed, so that the outer peripheral edge of the exterior material containing the power generation element is not excessively stressed, and the exterior material It can suppress that the intensity | strength of this falls with time.

It is a perspective view which shows the assembled battery containing the battery module which concerns on 1st Embodiment. It is a perspective view which shows the battery module which concerns on 1st Embodiment. It is a disassembled perspective view which decomposes | disassembles and shows the battery module which concerns on 1st Embodiment. It is a perspective view which shows the principal part of the frame member contained in the battery module which concerns on 1st Embodiment in the area | region illustrated in C of FIG. It is an end view which shows the principal part of the battery module which concerns on 1st Embodiment along the A-A 'line of FIG. It is an end view which shows the principal part of the battery module which concerns on 1st Embodiment along the B-B 'line | wire of FIG. It is an end view which shows the principal part of the battery module which concerns on 2nd Embodiment. It is a perspective view which shows the battery module which concerns on 3rd Embodiment. It is a disassembled perspective view which decomposes | disassembles and shows the battery module which concerns on 3rd Embodiment. It is a perspective view which shows the principal part of the frame member contained in the battery module which concerns on 3rd Embodiment in the area | region illustrated in E of FIG. It is an end view which shows the principal part of the battery module which concerns on 3rd Embodiment along the D-D 'line of FIG. It is a perspective view which shows the principal part of the frame member contained in the battery module which concerns on 4th Embodiment. It is an end elevation which shows the principal part of the battery module which concerns on 4th Embodiment. It is a perspective view which shows the principal part of the frame member contained in the battery module which concerns on 5th Embodiment. It is an end elevation which shows the principal part of the battery module which concerns on 5th Embodiment. It is an end elevation which shows the principal part of the battery module which concerns on 6th Embodiment. It is a perspective view which shows the principal part of the battery module which concerns on 7th Embodiment.

  Hereinafter, first to seventh embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The size and ratio of each member in the drawings are exaggerated for convenience of explanation and may be different from the actual size and ratio.

(First embodiment)
A battery module 1 according to the first embodiment and an assembled battery 100 configured by stacking a plurality of battery modules 1 will be described with reference to FIGS.

  FIG. 1 is a perspective view showing an assembled battery 100 including the battery module 1. FIG. 2 is a perspective view showing the battery module 1. FIG. 3 is an exploded perspective view showing the battery module 1 in an exploded manner. FIG. 4 is a perspective view showing a main part of the frame member 20 included in the battery module 1 in the region shown in FIG. 3C. FIG. 5 is an end view showing the main part of the battery module 1 along the line A-A ′ of FIG. 2. FIG. 6 is an end view showing the main part of the battery module 1 along the line B-B ′ of FIG. 2.

  As shown in FIG. 2, the battery module 1 includes a thin battery 10 and a frame member 20. The assembled battery 100 is configured by stacking a plurality of battery modules 1 in the thickness direction of the thin battery 10. As shown in FIG. 1, the assembled battery 100 includes a conductive member 30, a bus bar 40, and a fastening member 50 in addition to the thin battery 10 and the frame member 20 constituting the battery module 1.

  Therefore, hereinafter, the thin battery 10, the frame member 20, the conductive member 30, the bus bar 40, and the fastening member 50 will be described in this order.

  The thin battery 10 is included in the battery module 1. As shown in FIGS. 3, 5, and 6, the thin battery 10 includes a power generation element 11, an electrode tab 12, and an exterior material 13. The thin battery 10 corresponds to, for example, a lithium ion secondary battery, a polymer lithium battery, a nickel-hydrogen battery, or a nickel-cadmium battery.

  The power generation element 11 performs charging / discharging, and is formed by alternately stacking positive electrodes and negative electrodes via separators. The positive electrode is formed by applying a positive electrode active material to a conductive foil made of, for example, an aluminum foil. The negative electrode is formed by applying a negative electrode active material to a conductive foil made of, for example, copper foil. The positive and negative electrode conductive foils 11a are connected to electrode tabs 12 described later. The power generation element 11 is large and thin in a direction crossing the stacking direction as compared with the stacking direction of the positive electrode, the negative electrode, and the separator.

  The electrode tab 12 is an electrode terminal that supplies the power generated by the power generation element 11 to the outside, and is electrically connected to the end of the conductive foil 11 a of the power generation element 11. The electrode tabs 12 are led out from both ends of the power generation element 11, one for the positive electrode and the other for the negative electrode. The electrode tab 12 is formed of, for example, a metal plate made of an aluminum plate for the positive electrode and a copper plate for the negative electrode.

  The exterior material 13 seals the power generation element 11, and the outer peripheral edge 13 a is joined by heat welding or the like in a state where the power generation element 11 is housed inside and the electrode tab 12 is led out to the outside. The packaging material 13 is made of a pair of laminated films having flexibility, for example. The laminate film is a film having a resin layer on the surface of a metal foil. The outer peripheral edges 13a of a pair of laminate films are overlapped with the power generation element 11 sandwiched therebetween, and the outer peripheral edges 13a of the laminated laminate films are overlapped. By heating with a heat press or the like, the resin layer is welded to form the bag-shaped exterior material 13 with the outer peripheral edge 13a sealed, and at the same time, the power generation element 11 is accommodated therein. Insertion holes 13b are provided at two corners forming a diagonal of the outer peripheral edge 13a of the exterior member 13. The insertion hole 13 b penetrates only the exterior material 13 and does not penetrate the power generation element 11 and the electrode tab 12. The insertion hole 13b allows a positioning projection 23 provided in a main body portion 21 of the frame member 20 described later to be inserted.

  The frame member 20 is included in the battery module 1. As shown in FIGS. 2 to 6, the frame member 20 holds two thin batteries 10 adjacent to each other. As shown in FIG. 3, the frame member 20 includes a main body portion 21, an extending portion 22, a positioning protrusion 23, an electrode tab holding portion 24, and a groove portion 25 a and a protruding portion 25 b.

  The main body portion 21 is made of, for example, insulating reinforced plastics formed of modified polyphenylene oxide or the like, and has a through hole along the stacking direction of the thin battery 10, thereby forming a frame shape along the outer peripheral edge 13 a of the thin battery 10. Is formed. The main body 21 holds the outer peripheral edge 13a of the adjacent thin batteries 10 with the front surface 21a and the back surface 21b spaced apart from each other.

  The extending portion 22 is located at a position where the power generation element 11 is disposed from the main body portion 21 in a gap between the thin batteries 10 adjacent to each other in the stacking direction (in the thickness direction of the thin battery 10, It extends to the facing position) and abuts against the facing exterior material 13 respectively. The extending portion 22 determines the extending length in consideration of the magnitude of stress applied to the exterior material 13 and the durability of the exterior material 13. Specifically, the extending portion 22 extends from the main body portion 21 as the stress applied to the exterior material 13 is larger and the durability of the exterior material 13 is lower.

  With the above configuration, the outer peripheral edge 13 a of the thin battery 10 is held by the main body portion 21, and the power generation element 11 is further held by the extending portion 22 via the exterior material 13. With such a configuration, the movement of the power generation element 11 with respect to the stacking direction of the thin batteries 10 can be suppressed. Therefore, it is possible to prevent the exterior material 13 that houses the power generation element 11 from being damaged.

  The positioning protrusion 23 is a positioning protrusion for the thin battery 10. The positioning protrusions 23 are provided on the surface 21a of the main body portion 21 at the two opposing corners. The positioning protrusions 23 are inserted through the insertion holes 13 b of the exterior material 13 of the thin battery 10.

  The electrode tab holding portion 24 is a side in the short direction of the main body portion 21 (side where the positive and negative electrode tabs 12 are led out when the thin battery 10 is mounted), and intersects the stacking direction of the thin battery 10. It is provided to project outward from the direction. The electrode tab holding portion 24 holds the electrode tab 12 via the conductive member 30 in a state where the electrode tab holding portion 24 is inserted into the cross section of the conductive member 30 having a U-shaped cross section.

  The groove 25a is formed at the upper end of the side surface of the frame member 20 in the longitudinal direction (side adjacent to the side from which the positive and negative electrode tabs 12 lead out when the thin battery 10 is mounted). On the other hand, the protrusion 25 b is formed at the lower end of the side surface of the frame member 20 in the longitudinal direction. When stacking a plurality of frame members 20, the projections 25 b of the other frame members are connected to the groove portions 25 a of the one frame member 20. The insertion holes 26 are respectively opened at the four corners of the frame member 20. The insertion hole 26 allows a fastening bolt 53 of a fastening member 50 described later to be inserted. 2 and 3, the frame member 20 in the present embodiment is a frame body having a rectangular outer shape, and the side from which the positive and negative electrode tabs 12 are led out when the thin battery 10 is mounted. Are short and the sides facing each other adjacent to the side from which the electrode tab 12 is led out have a long rectangular shape. In the following description, a direction along the side from which the positive and negative electrode tabs 12 are derived is referred to as a short side, and two sides adjacent to the short side are referred to as a long side.

  The conductive member 30 is included in the assembled battery 100. As shown in FIGS. 2, 3, and 6, the conductive member 30 is disposed in the electrode tab holding portion 24 of the frame member 20 and electrically connects the adjacent thin batteries 10. The conductive member 30 is made of, for example, a copper alloy and has a U-shaped cross section. For example, the conductive member 30 electrically connects the electrode tabs 12 led out from both ends of the adjacent thin batteries 10 in parallel. In this case, the conductive member 30 connects the opposing positive electrode tabs 12 to each other and connects the opposing negative electrode tabs 12 to each other.

  The bus bar 40 is included in the assembled battery 100. As shown in FIG. 1, the bus bar 40 electrically connects the conductive members 30 respectively disposed on the adjacent frame members 20. The bus bar 40 is made of, for example, a copper alloy and is formed in a plate shape. The bus bars 40 are arranged so as to be alternately located at both ends of the adjacent frame members 20 in order to electrically connect the thin batteries 10 held by the frame members 20 in series. The bus bar 40 and the conductive member 30 are bonded together by locally irradiating a portion where they are in contact with each other and melting them locally.

  The fastening member 50 is included in the assembled battery 100. As shown in FIG. 1, the fastening member 50 integrally fastens a plurality of stacked frame members 20. The fastening member 50 includes an upper plate 51, a lower plate 52, and a plurality of fastening bolts 53. The upper plate 51 and the lower plate 52 are made of metal, for example, and are formed in a plate shape. Insertion holes for inserting fastening bolts 53 are provided at the four corners of the upper plate 51. At the four corners of the lower plate 52, there are provided screw grooves for screwing the threads formed at the tip of the fastening bolt 53. The fastening bolt 53 is inserted into the insertion holes 26 shown in FIG. 3 opened at the four corners of the frame member 20 through the upper plate 51 and then screwed into the screw grooves of the lower plate 52.

  According to the battery module 1 which concerns on 1st Embodiment mentioned above, there exist the following effects.

  The battery module 1 includes a thin battery 10 and a frame member 20. The thin battery 10 includes a thin power generation element 11, an electrode tab 12 electrically connected to an end of the power generation element 11, an outer peripheral edge 13 a in a state where the power generation element 11 is housed inside and the electrode tab 12 is led out to the outside. And an exterior material 13 joined together. The frame member 20 extends from the main body 21 to the position where the power generation element 11 is disposed in the gap between the adjacent thin batteries 10 and the main body 21 holding the outer peripheral edges 13a of the adjacent thin batteries 10 in a separated state. And extending portions 22 that respectively contact the flexible exterior material 13 that extends and faces each other.

  According to the battery module 1 configured as described above, the outer peripheral edge 13 a of the thin battery 10 is held by the main body portion 21 of the frame member 20, and further, the power generation element is interposed by the extending portion 22 of the frame member 20 via the exterior member 13. 11 is held. Therefore, even if vibration is applied to the thin battery 10 from the outside, the movement of the power generation element 11 in the thin battery 10 can be suppressed, so that an excessive stress is applied to the outer peripheral edge 13a of the exterior member 13 housing the power generation element 11. It can suppress that the intensity | strength of the exterior material 13 falls over time.

  More specifically, since the extension part 22 suppresses the movement of the thin battery 10 in the stacking direction, the phase of vibration between the frame member 20 and the thin battery 10 can be brought closer. That is, for example, even if the battery module 1 of the assembled battery 100 mounted on the vehicle vibrates with the operation of the vehicle, the frame member 20 and the thin battery 10 can be vibrated together. As a result, in the thin battery 10, it is possible to relieve stress applied to the outer peripheral edge 13 a of the exterior member 13 that houses the power generating element 11.

  Further, since the extending portion 22 extends in the gap between the adjacent thin batteries 10, for example, even if the battery module 1 of the assembled battery 100 mounted on the vehicle vibrates with the operation of the vehicle, the thin battery Tens do not interfere with each other. That is, for example, in order to prevent heat transfer between thin batteries 10, it may be necessary to form a gap between adjacent thin batteries 10, but when a gap is formed between adjacent thin batteries 10. For this reason, it is preferable to prevent the thin batteries 10 from interfering with each other due to vibration caused by the operation of the vehicle. On the other hand, when a sufficient gap is formed between adjacent thin batteries 10 in order to prevent the thin batteries 10 from interfering with each other due to vibrations associated with the operation of the vehicle, the dimensions of the battery modules 1 in the stacking direction. Will increase. In the present embodiment, since the extending portion 22 is extended in the gap between the adjacent thin batteries 10, the gap between the adjacent thin batteries 10 can be made as narrow as possible. The increase in the dimension in the direction can be suppressed, and the energy density per volume related to the battery module 1 can be improved as much as possible.

  In addition, since the extending portion 22 holds the power generation element 11 via the exterior member 13, each electrode crosses the stacking direction even when the number of electrodes stacked in the power generation element 11 is particularly large. It is possible to prevent the positional deviation caused by the movement in the direction. Accordingly, it is possible to suppress a decrease in strength over time of the exterior member 13 that houses the power generation element 11.

  Furthermore, the battery module 1 has a configuration in which the area of the portion where the exterior material 13 and the extending portion 22 face each other is larger than the area of the portion where the outer peripheral edge 13a and the main body portion 21 face each other. Also good.

  According to the battery module 1 configured as described above, the thin battery 10 can be held by the extending portion 22 without depending on the width of the outer peripheral edge 13a. The width of the outer peripheral edge 13 a corresponds to the width with respect to the direction intersecting the stacking direction of the thin batteries 10. That is, by supporting the thin battery 10 efficiently by making the area supporting the power generating element 11 having a high weight density among the members constituting the thin battery 10 larger than the area supporting the outer peripheral edge 13a, The stress applied to the thin battery 10 can be absorbed.

  Furthermore, the battery module 1 is preferably configured by extending the extending portion 22 from the main body portion 21 corresponding to the side from which the electrode tab 12 of the thin battery 10 is led out.

  According to the battery module 1 configured as described above, the load applied to the connection portion between the electrode tab 12 and the conductive foil 11a of the power generation element 11 can be reduced. That is, when vibration is input to the thin battery 10 and swings in the thickness direction, only the outer peripheral edge of the thin battery 10 at the lead-out side of the electrode tab 12 is supported by the main body 21 of the frame member 20. Then, the electrode tab 12 and the power generation element 11 swing at different phases, and a large load is applied to the connection portion between the electrode tab 12 and the conductive foil 11a of the power generation element 11. However, by supporting the power generation element 11 by the extending portion 22 on the lead-out side of the electrode tab 12, the electrode tab 12 and the power generation element 11 are supported by the same frame member 20, and the electrode tab 12 and the power generation element 11 Can be prevented from swinging at different phases. Therefore, the durability of the connecting portion between the power generation element 11 and the electrode tab 12 can be improved.

(Second Embodiment)
The battery module 2 according to the second embodiment will be described with reference to FIG.

  FIG. 7 is an end view showing a main part of the battery module 2.

  The battery module 2 according to the second embodiment is different from the battery module 1 according to the first embodiment described above in that the thin battery 10 and the frame member 20 are fixed.

  In the second embodiment, the same reference numerals are used for components having the same configuration as in the first embodiment described above, and the above description is omitted.

  As shown in FIG. 7, the battery module 2 fixes the outer peripheral edge 13 a of the thin battery 10 and the main body 21 of the frame member 20 with an adhesive 60. Similarly, the exterior material 13 of the thin battery 10 and the extending portion 22 of the frame member 20 are bonded and fixed by an adhesive 60. Any one of the outer peripheral edge 13a of the thin battery 10 and the main body 21 of the frame member 20 or the exterior member 13 of the thin battery 10 and the extending portion 22 of the frame member 20 may be bonded and fixed. Here, when laminating the frame member 20, the thin battery 10 sandwiched between one frame member 20 and another frame member 20 may be bonded and fixed from both sides with an adhesive 60.

  The fixing of the thin battery 10 and the frame member 20 is not limited to the adhesive fixing by the adhesive 60. For example, the thin battery 10 and the frame member 20 are locally welded and fixed by applying ultrasonic waves to the thin battery 10 and the frame member 20. May be.

  According to the battery module 2 which concerns on 2nd Embodiment mentioned above, in addition to the effect which concerns on 1st Embodiment mentioned above, there exist the following effects.

  In the battery module 2, at least one of the outer peripheral edge 13 a of the thin battery 10 and the main body portion 21 of the frame member 20, and the exterior material 13 of the thin battery 10 and the extending portion 22 of the frame member 20 is fixed.

  According to the battery module 2 configured in this way, the movement of the power generating element 11 is further improved as compared with the case where at least one of the outer peripheral edge 13a and the main body portion 21 and the exterior material 13 and the extending portion 22 is not fixed. It can be surely suppressed. Therefore, it can prevent more reliably that the intensity | strength of the exterior material 13 which accommodated the electric power generation element 11 falls over time.

  Furthermore, in the battery module 2, at least one of the outer peripheral edge 13 a and the main body portion 21, and the exterior material 13 and the extending portion 22 may be fixed by a deformable adhesive 60.

  According to the battery module 2 configured as described above, even if the power generation element 11 deteriorates and expands with time, the adhesive 60 is deformed and contracts, so that the expansion of the thin battery 10 is not hindered. That is, the adhesive 60 is contracted in accordance with the expansion of the power generation element 11 so that no load is applied to the exterior material 13 housing the power generation element 11, and the strength of the exterior material 13 decreases with time. Can be prevented.

(Third embodiment)
The battery module 3 according to the third embodiment will be described with reference to FIGS.

  FIG. 8 is a perspective view showing the battery module 3. FIG. 9 is an exploded perspective view showing the battery module 3 in an exploded manner. FIG. 10 is a perspective view showing the main part of the frame member 20 included in the battery module 3 in the region shown in E of FIG. FIG. 11 is an end view showing the main part of the battery module 3 along the line D-D ′ of FIG. 8.

  The configuration of the battery module 3 according to the third embodiment is different from the configuration of the battery module 2 according to the second embodiment described above in that the frame member 20 includes the through hole 27 for cooling the thin battery 10.

  In the third embodiment, the same reference numerals are used for components having the same configuration as in the first or second embodiment described above, and the above description is omitted.

  As shown in FIGS. 8 to 11, the battery module 3 includes groove-shaped through holes 27 on both sides of the side surface of the frame member 20 in the longitudinal direction. The longitudinal side of the frame member 20 corresponds to the side where the electrode tab 12 is not led out from the thin battery 10. The air blown into the frame member 20 from one through hole 27 passes through the gap between the adjacent thin batteries 10 and is exhausted from the other through hole 27. In the frame member 20, the extended portion 22 is not provided at a location where the through hole 27 is provided.

  The through hole 27 is not limited to the above configuration, and may be configured as follows, for example. The through holes 27 may be provided on both sides of the side surface of the frame member 20 in the lateral direction. It is good also as a structure provided with the through-hole 27 in the location which does not overlap with the extension part 22, after providing the extension part 22 over the perimeter inside the frame member 20. FIG. The through hole 27 may be provided only on one side of the side of the side of the frame member 20 in the longitudinal or lateral direction. The through hole 27 may have a configuration in which a plurality of round holes are provided at regular intervals on the side surface of the frame member 20 in the longitudinal or lateral direction.

  According to the battery module 3 which concerns on 3rd Embodiment mentioned above, in addition to the effect which concerns on 1st and 2nd embodiment mentioned above, there exist the following effects.

  In the battery module 3, the frame member 20 includes a through hole 27 in a direction intersecting with the stacking direction of the thin batteries 10.

  According to the battery module 3 configured as described above, since the thin battery 10 can be sufficiently cooled through the through hole 27, the internal structure of the thin battery 10 can be prevented from being deteriorated, which is effective in the first embodiment. In addition, the design life of the thin battery 10 can be maintained.

(Fourth embodiment)
The battery module 4 according to the fourth embodiment will be described with reference to FIGS. 12 and 13.

  FIG. 12 is a perspective view showing a main part of the frame member 20 included in the battery module 4. FIG. 13 is an end view showing the main part of the battery module 4.

  The battery module 4 according to the fourth embodiment differs from the structure of the battery module 2 according to the second embodiment described above in that the extending portion 28 of the frame member 20 is tapered.

  In the fourth embodiment, the same reference numerals are used for components having the same configuration as in any of the first to third embodiments described above, and the above description is omitted.

  As shown in FIGS. 12 and 13, the battery module 4 has the extending portion 28 of the frame member 20 formed in a tapered shape. Specifically, the extending portion 28 has a constant thickness from the main body portion 21 to the exterior material 13 and a gradually thinner portion at the tip side. Therefore, the gap between the adjacent thin batteries 10 becomes wider from the end of the frame member 20 toward the center. The thickness of the main body 21 corresponds to the thickness of the thin battery 10 in the stacking direction.

  The extending portion 28 is not limited to the above configuration, and may be configured as follows, for example. The extending portion 28 may include a portion from the main body portion 21 until it comes into contact with the exterior material 13, and may be configured to gradually reduce the thickness in a direction away from the main body portion 21. The extending portion 28 may be formed so as to be curved in a convex shape with respect to the outside in a direction away from the main body portion 21. Similarly, the extending part 28 may be formed so as to be curved in a concave shape with respect to the inside in a direction away from the main body part 21.

  According to the battery module 4 which concerns on 4th Embodiment mentioned above, in addition to the effect which concerns on 1st-3rd embodiment mentioned above, there exist the following effects.

  In the battery module 4, at least a part of the extending portion 28 of the frame member 20 is configured to have a thickness that decreases in a direction away from the main body portion 21.

  According to the battery module 4 configured in this manner, the extension of the power generation element 11 is not hindered by forming the extending portion 28 in a tapered shape. The power generation element 11 expands as the deterioration progresses over time. As for the electric power generation element 11, the center part expand | swells relatively rather than an edge part. Therefore, when the power generation element 11 expands by forming the extending portion 28 so as to become thinner from the end portion of the power generation element 11 toward the center, the load is not applied to the power generation element 11. To. Therefore, in addition to the effects in the first embodiment, when the power generation element 11 expands, it is possible to suppress an excessive reaction force from being input to the power generation element 11 from the extending portion 28.

(Fifth embodiment)
A battery module 5 according to a fifth embodiment will be described with reference to FIGS. 14 and 15.

  FIG. 14 is a perspective view showing a main part of the frame member 20 included in the battery module 5. FIG. 15 is an end view showing a main part of the battery module 5.

  The battery module 5 according to the fifth embodiment has a configuration in which the first inclined portion 13c of the thin battery 10 and the second inclined portion 29 of the frame member 20 are in contact with each other, according to the first to fourth embodiments described above. Different from the configuration of modules 1 to 4.

  In the fifth embodiment, the same reference numerals are used for components having the same configuration as in any of the first to fourth embodiments described above, and the above description is omitted.

  As shown in FIGS. 14 and 15, the battery module 5 includes a first inclined portion 13 c that is inclined with respect to the stacking direction of the power generating elements 11 at a portion where the outer peripheral edge 13 a protrudes in the exterior material 13 of the thin battery 10. I have. Further, the main body portion 21 of the frame member 20 is provided with a second inclined portion 29 that is inclined with respect to the stacking direction of the power generation elements 11 and abuts on the first inclined portion 13 c at a portion where the extending portion 22 extends. . The second inclined portion 29 is formed by cutting out part of the front surface 21 a side and the back surface 21 b side at the end of the main body portion 21.

  The 1st inclination part 13c of the thin battery 10 and the 2nd inclination part 29 of the frame member 20 are not limited to the said structure, For example, it is good also as the following structures. The first inclined portion 13c of the thin battery 10 is formed in a convex shape with respect to the outside, and the second inclined portion 29 of the frame member 20 is formed in a concave shape with respect to the inside and then brought into contact with each other. Also good. Similarly, the first inclined portion 13c of the thin battery 10 is formed in a concave shape with respect to the inside, and the second inclined portion 29 of the frame member 20 is formed in a convex shape with respect to the outside, and then abuts each other. A configuration may be adopted.

  According to the battery module 5 which concerns on 5th Embodiment mentioned above, in addition to the effect which concerns on 1st-3rd embodiment mentioned above, there exist the following effects.

  In the battery module 5, the exterior material 13 of the thin battery 10 includes a first inclined portion 13 c that is inclined with respect to the stacking direction of the power generating elements 11 at a portion where the outer peripheral edge 13 a protrudes. Furthermore, the main body portion 21 of the frame member 20 includes a second inclined portion 29 that is inclined with respect to the stacking direction of the power generating elements 11 and is in contact with the first inclined portion 13 c at a portion where the extending portion 22 extends. .

  According to the battery module 5 configured as described above, the first inclined portion 13c provided in the exterior material 13 and the second inclined portion 29 provided in the main body portion 21 are brought into contact with each other, whereby the thin battery 10 is stacked. The movement of the power generation element 11 with respect to the direction crossing the direction can be suppressed. Therefore, since an excessive load is not applied to the connection portion between the power generation element 11 and the electrode tab 12, the electrode tab 12 and the conductive foil 11a can be prevented from being damaged, and the durability can be improved.

(Sixth embodiment)
The battery module 6 according to the sixth embodiment will be described with reference to FIG.

  FIG. 16 is an end view showing the main part of the battery module 6.

  In the battery module 6 according to the sixth embodiment, the configuration in which the first inclined portion 13c of the thin battery 10 and the second inclined portion 29 of the frame member 20 are fixed is the same as that of the battery module 5 according to the fifth embodiment described above. Different from the configuration.

  In the sixth embodiment, the same reference numerals are used for components having the same configuration as in any of the first to fifth embodiments described above, and the above description is omitted.

  In the battery module 6, as shown in FIG. 16, the first inclined portion 13 c of the thin battery 10 and the second inclined portion 29 of the frame member 20 are fixed by an adhesive 60. Similarly, the outer peripheral edge 13 a of the thin battery 10 and the main body 21 of the frame member 20 are fixed by an adhesive 60. Similarly, the exterior material 13 of the thin battery 10 and the extending portion 22 of the frame member 20 are bonded and fixed by an adhesive 60.

  The fixing of the first inclined portion 13c and the second inclined portion 29 is not limited to the adhesive fixing by the adhesive 60, and for example, by applying ultrasonic waves to the first inclined portion 13c and the second inclined portion 29. Alternatively, it may be fixed by locally welding.

  According to the battery module 6 which concerns on 6th Embodiment mentioned above, in addition to the effect which concerns on 1st-5th embodiment mentioned above, there exist the following effects.

  In the battery module 6, the first inclined portion 13 c of the thin battery 10 and the second inclined portion 29 of the frame member 20 are fixed.

  According to the battery module 6 configured as described above, the power generation element 11 moves in the direction intersecting the stacking direction of the thin batteries 10 as compared with the case where the first inclined portion 13c and the second inclined portion 29 are not fixed. Can be more reliably suppressed. Therefore, since it can prevent that an excessive load is applied to the connection part of the electric power generation element 11 and the electrode tab 12, damage to the electrode tab 12 and the electrically conductive foil 11a can be prevented.

  Further, in the battery module 6, the first inclined portion 13 c and the second inclined portion 29 may be fixed by a deformable adhesive 60.

  According to the battery module 6 configured as described above, even when the power generation element 11 deteriorates and expands with time, the adhesive 60 is deformed and contracts, so that the expansion of the power generation element 11 can be absorbed. .

(Seventh embodiment)
The battery module 7 according to the seventh embodiment will be described with reference to FIG.

  FIG. 17 is a perspective view showing a main part of the battery module 7.

  In the battery module 7 according to the seventh embodiment, the configuration in which the extending portion 22 is cut out over the range where the electrode tab 12 of the thin battery 10 is led out is the same as in the fifth and sixth embodiments described above. It differs from the structure of the battery modules 1-6 which concern.

  In the seventh embodiment, the same reference numerals are used for components having the same configuration as in any of the fifth and sixth embodiments described above, and the above description is omitted.

  As shown in FIG. 17, the battery module 7 includes a cutout portion 22 a in which the extending portion 22 is cut out over the range where the electrode tab 12 is led out on the side surface of the frame member 20 on the short side. ing.

  According to the battery module 7 which concerns on 7th Embodiment mentioned above, in addition to the effect which concerns on 5th and 6th embodiment mentioned above, there exist the following effects.

  The extending portion 22 includes a cutout portion 22a at least in a region extending over a range where the electrode tab 12 of the thin battery 10 is led out.

  According to the battery module 7 configured as described above, when a large inertial force acts on the thin battery 10 in a direction intersecting the thickness direction (stacking direction), the power generation element 11 moves inside the thin battery 10. Thus, it is possible to prevent the conductive foil 11 a connected to the power generation element 11 and the electrode tab 12 from being sandwiched between the power generation element 11 and the second inclined portion 29 of the frame member 20 and being damaged.

  In addition, the present invention can be variously modified based on the configurations described in the claims, and these are also within the scope of the present invention.

1,2,3,4,5,6,7 battery modules,
10 Thin battery,
11 Power generation elements,
11a conductive foil,
12 electrode tabs,
13 Exterior material,
13a outer periphery,
13b insertion hole,
13c 1st inclination part,
20 frame member,
21 body,
21a surface,
21b reverse side,
22, 28 extension part,
22a Notch,
23 positioning protrusions,
24 electrode tab holder,
25a groove,
25b protrusion,
26 insertion hole,
27 through holes,
29 second inclined part,
30 conductive members,
40 Busba,
50 fastening members,
51 upper plate,
52 Lower plate,
53 fastening bolts,
60 adhesives,
100 battery pack.

Claims (11)

A power generation element formed by alternately laminating positive and negative electrodes via separators, an electrode tab electrically connected to an end of the power generation element, the power generation element stored inside, and the electrode tab outside A plurality of thin batteries formed by laminating in a state of being spaced apart from each other,
The main body part that holds the outer peripheral edges of the thin batteries adjacent to each other in a separated state, and the facing and extending from the main body part to the position where the power generation element is disposed in the gap between the adjacent thin batteries A frame member including an extending portion that abuts each of the exterior materials,
The frame member is
A frame-like body having a rectangular shape with a through-hole along the stacking direction of the thin battery on the center side of the thin battery with respect to the extending portion;
And the body portion and the extending portion is formed on one body,
The through hole is located in a portion where the power generation element is disposed,
The extending portion is a battery module that holds the power generation element via the exterior material .   The battery module according to claim 1, wherein at least one of the outer peripheral edge and the main body portion, and the exterior material and the extending portion are fixed.   The battery module according to claim 2, wherein at least one of the outer peripheral edge and the main body portion, and the exterior material and the extending portion is fixed by a deformable adhesive.   The area of the part where the said exterior material and the said extension part are facing each other is larger than the area of the part where the said outer periphery and the said main-body part are facing each other. The battery module described in 1.   The battery module according to any one of claims 1 to 4, wherein the extending part extends from the main body part in correspondence with a side from which the electrode tab of the thin battery is led out.   The battery module according to claim 1, wherein the frame member includes a through hole in a direction intersecting with a stacking direction of the thin batteries.   7. The battery module according to claim 1, wherein at least a part of the extending portion is formed with a small thickness in a direction away from the main body portion. The exterior material includes a first inclined portion that is inclined with respect to the stacking direction of the power generation elements at a portion where the outer peripheral edge projects.
The said main-body part is provided with the 2nd inclination part which inclines with respect to the lamination direction of the said electric power generation element and contact | abuts to the said 1st inclination part in the site | part which extends the said extension part. The battery module according to claim 1.   The battery module according to claim 8, wherein the first inclined portion and the second inclined portion are fixed.   The battery module according to claim 9, wherein the first inclined portion and the second inclined portion are fixed by a deformable adhesive.   The battery module according to any one of claims 8 to 10, wherein the extending part includes a notch part at least in a region extending in a range where the electrode tab of the thin battery is led out.