JP2007095599A - Thin battery module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To highly reliably construct an electrical connection of an anode lead terminal with a cathode lead terminal between batteries mounted to a thin battery module with a simple constitution. <P>SOLUTION: A plurality of storage recesses 7 having an inner peripheral shape, into which a shape in a plane view of an outer shape of an electrode 1 is fittingly insertable, are arranged side by side on a straight line on at least one of the opposite faces of a pair of storage bodies 5, 6 including power-generation elements 10 while vertically sandwiching them. When the electrode 1 is fittingly inserted into each recess 7, the anode lead terminal 2a and the cathode lead terminal 3a respectively led out from each electrode 1 fittingly inserted into the recesses 7 adjacent to each other are superposed on a straight line, and each power-generation element 10 is constrained into recessed-part spaces of a pair of the storage bodies 5, 6. The power-generation elements 10 are sealed by joining both storage bodies 5, 6 to each other after leading out the anode lead terminal 2a and the cathode lead terminal 3a respectively from each of both end edges in the arrangement direction of the power-generation elements in a pair of the storage bodies 5, 6 in the state. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a thin battery module that constitutes, for example, an assembled battery serving as a power source of an electric vehicle, and more particularly to improvement of the structure.

  With the development and spread of various electronic devices in recent years, there is an increasing need for downsizing and space saving of the electronic devices. Along with the downsizing and space saving of such electronic devices, there is an increasing need for downsizing, space saving, and weight reduction of batteries as power sources mounted thereon. A typical example of such a small and light battery is a thin lithium secondary battery used for a mobile phone or the like.

  In this thin lithium secondary battery, a power generation element in which a positive electrode plate, a separator, and a negative electrode plate are laminated or wound is covered with a laminate film composed of a polymer and a metal. The lead terminal is derived.

  As described above, the thin lithium secondary battery having such a configuration is widely used and used in small electronic devices such as mobile phones and portable digital cameras. As a power supply source of high energy and high output density for electric cars and hybrid cars being developed in Japan, attention is attracting attention.

  When this thin lithium secondary battery (hereinafter simply referred to as a thin battery) is used as a power source for an electric vehicle or the like, the thin battery unit is not used as it is but is used as a unit. In general, a battery module is configured by combining a plurality of battery modules, and the battery modules are used as a new battery, and a plurality of the battery modules are assembled and used as an “assembled battery”. An example of a battery module constituting the assembled battery is disclosed in the following known documents (Patent Documents 1 and 2).

  As disclosed in Patent Document 1, first, as shown in FIG. 3 and the like of the document, the lead terminals of the positive electrode and the negative electrode are derived from one side of the main body exterior of a generally thin rectangular parallelepiped. As shown in FIGS. 1 and 2 of the same document, a plurality of batteries (four in the figure) are arranged in a planar form on a flat support, as shown in FIGS. The positive and negative lead terminals derived from each are connected to electrical conductors disposed on the same support. These batteries are electrically connected in series.

  On the other hand, the battery disclosed in Patent Document 2 is different from the battery disclosed in Patent Document 1, and as shown in FIG. From both ends in the longitudinal direction of the outer casing, the lead terminals of the positive electrode and the negative electrode are led out in a straight line in opposite directions.

However, as the form of the battery module, like the one disclosed in the prior art document 1, a plurality of batteries are arranged on a flat plate support in a planar shape, and positive and negative lead terminals led out from each of them. Are connected to a bus bar which is a common connecting member disposed on the same support. In the case of what is disclosed in Patent Document 2, FIG. 13A shows a parallel connection configuration of batteries, and FIG. 13B shows a serial connection configuration.
Japanese Unexamined Patent Publication No. 2003-242951 (FIGS. 1, 2, and 3) JP 2004-31136 A (FIGS. 13 and 16)

  Incidentally, the thin battery modules disclosed in Patent Documents 1 and 2 as described above have the following problems. That is, in each of the thin battery modules disclosed in the above-mentioned patent documents, the battery is sandwiched between upper and lower support plates in the thickness direction, and the fixing method of the support plates is not clear, but is sandwiched in the thickness direction. It has only been done.

  Moreover, the lead terminal led out from the thin battery main body is also only sandwiched between the upper and lower support plates via the electric conductor (known document 1) and the bus bar (known document 2).

  In such a connection form between the battery and the support body, when the battery module receives an impact, the battery body may swing along the surface direction of the support body. A force is also applied along the surface direction of the support plate to the lead terminal only pressed by the connecting member, and the connection with the connecting member gradually shifts. In the worst case, the lead terminal and the connecting member There is a possibility that the connection state may be lost and the electrical connection between the positive and negative lead terminals may not be achieved. Further, the lead terminal itself is rubbed against the connecting member, so that it may be mechanically deteriorated and damaged.

  Furthermore, as described above, since the main body of the battery is only sandwiched between the support bodies, when the module receives vibration and a force acts between the lead terminal and the battery main body, the exterior material ( A crack may occur in the laminate film in which the polymer and the metal are combined, and the electric field inside the battery may leak.

  The problems described above are urgent issues to be solved in order to further combine the battery modules into an “assembled battery” and mount it in a car with severe vibration.

  Therefore, the present invention is a thin battery module in which the electrical connection between the positive and negative electrode lead terminals between the batteries mounted thereon is constructed with high reliability and can be realized with a simple configuration. For the purpose.

  In order to achieve the above object, the present invention provides a plurality of power generation elements having a positive electrode and a negative electrode lead terminal that are laminated or wound around a positive electrode plate, a separator, and a negative electrode plate and that are led out in a direction opposite to the periphery. A pair of storage bodies that sandwich and enclose the power generation element, and the pair of storage bodies include the outer shape of the electrode of the power generation element on at least one of the opposing surfaces that sandwich the power generation element. A plurality of inner circumferential storage recesses that can be inserted into a shape projected onto a plane perpendicular to the direction in which the body is sandwiched are juxtaposed in a straight line, and the electrodes are inserted into each storage recess to store a pair. When the opposing surfaces of the body are aligned, the positive and negative lead terminals derived from the electrodes inserted in adjacent storage recesses overlap in a straight line, and the electrodes are constrained by the pair of storage recesses. , Paired storage body It said although bonded to the power generating element housed in the periphery, it is to that with the thin cell module lead terminal arrangement direction of both edges from the positive electrode and the negative electrode of the power generating element having a structure that is derived.

  Since it has such a configuration, the electrode of the power generation element is constrained by the storage recess space formed by combining the pair of storage bodies, and the lead terminals led out from the adjacent electrodes are also an electric conductor, a bus bar, etc. Without being connected to the connecting member, the two members are directly stacked and sandwiched between the opposing surfaces of the pair of storage members so that they are electrically connected. If a module is formed, even if the module is subjected to vibration, the power generation elements inside the module are firmly restrained in the vertical and horizontal directions, so the lead terminals do not overlap and force is applied to the lead terminals themselves. There is no risk of damage.

  The said structure WHEREIN: The recessed part into which the said lead terminal fits in the said accommodating body can be provided. If that configuration is adopted, the lead terminal with a large thickness as in the case of a large-capacity battery module mounted on an electric vehicle or the like can be generated by a pair of housings if the lead terminal is fitted in the recess. Even if the element is sandwiched, there is no fear that the lead terminal is strongly pressed on the opposing surface of the container and damaged.

  In each of the above-described configurations, the pair of storage bodies can be formed from a laminate packaging material in which a base material, an aluminum foil, and a heat-adhesive resin film are laminated and joined in this order. When a battery module is formed with a power generation element sandwiched between bodies, a heat-adhesive resin can be disposed on the opposing surface sides, and the two storage bodies can be bonded together by thermal bonding.

  In that case, the layer of the said heat bondable resin film can take the structure which is resin which has metal adhesiveness, and if it does so, the heat bondable resin which comprises the opposing surface side (recessed part formation side) of a storage body It is preferable to use a metal adhesive resin. Thereby, the lead terminal which is a metal can be adhered to the opposing surface of the storage body, and the gap reaching the concave portions 7 and 17 can be eliminated.

  In addition, it is possible to take a configuration in which the lead terminal adhesive film is adhered to the peripheral surface of the lead terminal except for the overlapping portion with the lead terminal derived from the adjacent electrode, and if so, By the adhesive action of the film, the lead terminal can be adhered to the heat-adhesive resin layer of the container, and the gap can be eliminated.

  Since the present invention is configured as described above, in the thin battery module, the positive and negative lead terminals between the power generation elements mounted on the thin battery module are electrically connected without using a connecting member for electrically connecting them. Is constructed with high reliability, and this can be realized with a simple configuration in which a recess is formed in the storage body.

  The fact that the connecting member is not required can also lead to savings in material costs and production efficiency (improvement of assembly) in module production.

  Further, since the electrode portion of the power generation element is also securely restrained without swinging with respect to the storage body, there is no possibility that the metal foil of the packaging material is damaged and the electrolytic solution inside leaks out.

  If a pair of storage bodies is formed from a laminate packaging material in which a base material, an aluminum foil, and a heat-adhesive resin film are laminated and bonded in this order, a battery module is formed with the power generation element sandwiched between the pair of storage bodies, It is possible to bond both containers by thermal bonding by placing a heat-adhesive resin on the opposite side of each other, rather than bonding using adhesive, the cost of the adhesive and the application process of the adhesive The production efficiency is good.

  If a resin having metal adhesion is used for the layer of the heat-adhesive resin film, the lead terminal, which is a metal, can be adhered to the opposing surface of the container to eliminate the gap reaching the concave portion, and the inflow of the electrolyte can be prevented. Can be blocked.

  If the lead terminal adhesive film is adhered to the peripheral surface of each lead terminal except for the overlapping portion with the lead terminal derived from the adjacent electrode, the lead terminal is attached to the container by the adhesive action of the film. By adhering to the heat-adhesive resin layer, there is no gap, and the inflow of the electrolytic solution to the recess into which the electrode is inserted can be blocked.

(First embodiment)
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, in which (a) is a schematic view of the external appearance of a power generation element 10 mounted in the first embodiment. And (b) is a disassembled perspective view of a pair of storage body which mounts the electric power generation element 10 of (a). In addition, since the internal structure of the electric power generation element 10 is the same as that of FIG. 1 of the above-mentioned patent document 2, etc., please refer to the figure about an internal structure.

  First, as shown to (a), the power generation element 10 in this embodiment is the width direction of the both end surfaces 2 and 3 of the longitudinal direction of the electrode 1 of a thin rectangular parallelepiped in the strip | belt-shaped lead terminals 2a and 3a of a positive electrode and a negative electrode. It is assumed that the upper surfaces 2b and 3b of the bands are derived from the intermediate positions in opposite directions, and are flush with the upper surface 1b of the electrode 1.

  Next, the pair of storage bodies 5 and 6 for storing the power generation element 10 shown in (a) is first placed on the surface of a long plate body like the storage body 5 shown on the lower side of (b). In addition, three concave portions for accommodating the electrodes 1 are arranged in a straight line along the longitudinal direction of the plate body, and the lower housing is similar to the housing body 6 shown in the upper side of FIG. It consists of a long plate that covers the surface of the body 5 and whose opposing surface 6b is flat.

  Each of the pair of storage bodies 5 and 6 is formed of a laminate packaging material in which a base material, an aluminum foil, and a heat-adhesive resin film are laminated in this order and joined by dry lamination or the like. As the substrate, a heat-resistant resin such as ON (stretched nylon) or PET (polyethylene terephthalate) is used.

  And about the lower storage body 5, the layer 5 of the thermoadhesive resin film is arrange | positioned in the surface 5b which forms the recessed part 7, ie, the opposing surface 6b side of the upper storage body 6, About the upper storage body 6, It is assumed that a layer of a heat-adhesive resin film is disposed on the facing surface 6b side with respect to the lower storage body 5. This is because the two storage bodies 5 and 6 are bonded by thermal bonding as will be described later.

  Each recess 7 on the surface of the lower housing 5 in the lower part of FIG. (B) has an inner peripheral shape in which the electrode 1 fits (inserts). The electrode 1 is inserted into the recess 7 and the upper recess 5 is inserted. By covering with the storage body 6, the electrode body 1 has a dimensional shape constrained in the thickness direction of the electrode 1 (depth direction of the recess 7).

  Further, as shown in FIG. 2, when the electrode 1 is stored in each of the three recesses 7, the positive and negative lead terminals 2a and 3a led out from the electrode 1 inserted into the adjacent storage recess 7 are used. Are overlapped on a straight line.

  FIG. 2 shows a state in which the electrode 1 is inserted into the lower housing 5 in which such a recess 7 for housing an electrode is formed. As shown in the figure, the electrode 1 inserted into the housing 5 has the upper surface 1b of the electrode and the upper surfaces 2b and 3b of the lead terminals led out to be flush with the upper surface 1b. The surface of the storage body 5 (upper surface 5b) is flush with the surface. Further, as just described, the positive and negative lead terminals 2a and 3a led out from the electrode 1 inserted into the adjacent storage recess 7 overlap each other in a straight line.

  Then, one lead terminal on each side of the three power generating elements 10 is in a straight line from each of both end faces in the longitudinal direction of the housing 5 as the positive and negative lead terminals of the finally formed module. The shape protrudes in the opposite direction. In the figure, a negative lead terminal 3a is led out on the right hand side of the drawing, and a positive lead terminal 2a is led out on the left hand side.

  The lower storage body 5 in which the power generation element 10 is stored is covered with the upper storage body 6 shown above. The upper storage body 6 is a longitudinal plate having a flat surface 6 b facing the upper surface 5 b of the lower storage body 5. As described above, the contact surfaces 5b and 6b are bonded together by thermal bonding, and the power generating element 10 is sealed with both the storage bodies 5 and 6. At this time, the overlapping of the lead terminals 2a and 3a of the adjacent power generation elements 10 does not need to be particularly joined before the thermal bonding of the storage bodies 5 and 6; This is because it is possible to obtain a joined state in which electrical conduction can be ensured with the crimping force.

  Thus, in the present invention, an extra connecting member such as an electric conductor or a bus bar in the above-mentioned publicly known document is not required, and the assemblability is superior to the conventional one.

  In the present embodiment, the two storage bodies 5 and 6 are bonded by thermal bonding. However, the present invention is not limited to thermal bonding. An adhesive may be used as long as sufficient adhesive performance is obtained. However, when bonded by thermal bonding, the cost of the adhesive and the application process of the adhesive can be omitted and the production efficiency is better than the case of bonding using an adhesive. Adopting thermal bonding.

  In addition, the pair of storage bodies 5 and 6 of the present embodiment both have a simple shape such as a plate having a long outer shape, but the shape of the storage bodies 5 and 6 is such as this. It is not limited to. For example, considering the weight reduction of an actual product, the lower housing 5 has a meat portion only in the portion where the concave portion 7 is formed, and the others are cut off. It may be anything. That is, although not shown in the drawing, a plurality of flanges around the recess 7 are connected.

  Alternatively, when a plurality of completed modules are combined to form an “assembled battery” to be mounted on an electric vehicle or the like, the surfaces of the storage bodies 5 and 6 are provided with irregularities that can be inserted into each other. Assembling is easy and the ease of assembly is improved, and if the assembled battery is fixed with a separately prepared fixing means, the assembled battery can be used even if it is mounted on a vibrant electric vehicle. Each module constituting the “assembled battery” is a stable structure which is not easily subjected to vibration. As such, a storage body having irregularities that can be fitted to each other on the surface may be used.

  What is important is that, as described above, the concave portion 7 on the surface of the lower housing body 6 in FIG. 1B for housing the power generation element 10 and the lower housing body 6 in FIG. The electrode 1 is inserted into the recess 7 and is covered with the upper storage body 6 so that the electrode 1 is constrained in the vertical and horizontal directions.

  That is, the inner peripheral shape of the concave portion 7 is a dimension in which the outer shape of the electrode 1 in plan view can be inserted, and the depth of the concave portion 7 is almost the same as the thickness of the electrode 1. When the upper storage body 6 is capped, the flat opposing surface 6b of the upper storage body 6 to the lower storage body 5 and the upper surface 5b of the lower storage body 5 (the opposing surface to the upper storage body 6) ) And the upper surface of the electrode 1 and the upper surfaces 2b and 3b of the lead terminals are flush with each other.

  By doing so, even if the module receives vibration, the power generation element 10 is restrained by the storage bodies 5 and 6, so that no large vibration is transmitted to the electrode 1, and accordingly, the lead terminals 2 a and 3 a The electrical connection is not broken, and the lead terminals 2a and 3a are not mechanically damaged.

  Other than that, the surface shape of both the storage bodies 5 and 6 may not be a flat surface as depicted in FIG. 1B or FIG. It may be a thing.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. 3A is a schematic perspective view showing the external appearance of the power generation element 20 mounted on the module of the second embodiment in FIG. 3A, and FIG. 3B is a pair of storage bodies 15 and 16 in which the power generation element 20 is mounted. Is shown in an exploded perspective view.

  First, in the present embodiment, the power generation element 20 has a shape different from that of the first embodiment. That is, in the power generation element 20 mentioned in the present embodiment, the electrode 11 forms a thin rectangular parallelepiped like the first embodiment, but is derived from each of the longitudinal end faces 12 and 13 of the electrode 11. The lead-out positions of the positive and negative lead terminals 12a and 13a are different.

  In this embodiment, the lead-out position is the intermediate position in the width direction of the lead-out surfaces 12 and 13 as in the first embodiment. However, as in the first embodiment, the top surface of the lead terminal is the same as in the first embodiment. 12b and 13b are not flush with the upper surface 11b of the main body, but the center in the thickness direction of the strips of the lead terminals 12a and 13a coincides with the intermediate position in the thickness direction of the lead-out surfaces 12 and 13. ing.

  Note that the internal configuration of the power generation element 20 is the same as that disclosed in FIG. 1 of the above-mentioned Patent Document 2 in the present embodiment, as in the first embodiment. Refer to the figure. Only the positions where the lead terminals 12a and 13a are led out are different.

  Along with the different external shape of the power generation element 20 as described above, the shape of the pair of storage bodies 15 and 16 of the present embodiment is also different from that of the first embodiment. In this embodiment, the difference is that the storage bodies 15 and 16 are formed of a pair of upper and lower longitudinal plates, but the recesses 17 and 18 into which the electrodes 11 of the power generating element 20 are inserted are the upper and lower storage bodies 15 and 16. It is provided in both of the opposing surfaces 15b and 16b. Three recesses 17 and 18 are juxtaposed along the longitudinal direction of the storage bodies 15 and 16 in order to insert the three electrodes 11 respectively.

  However, as for the material, the packaging body of the present embodiment is also a laminated packaging material in which a base material, an aluminum foil, and a heat-adhesive resin film are laminated in this order and joined together by dry lamination as in the case of the first embodiment. In this case, the heat-adhesive resin film layer is arranged on the opposing surfaces 15b and 16b side.

  As shown in FIG. 3 (b), the recess 17 of the lower housing 15 has an inner peripheral shape in which the electrode 11 can be snugly fitted, but its depth is half the thickness of the electrode 11. ing. The upper storage body 16 also has the same shape as the lower storage body 15.

  The above is the shape of the upper and lower storage bodies 15 and 16 in the present embodiment. When the electrode 11 is stored in the concave portion 17 of the lower storage body 15, the electrode 11 is placed in the concave portion 17 as shown in FIG. It fits snugly. The positive and negative lead terminals 12a and 13a led out from the adjacent electrodes 11 are overlapped so that electrical connection can be achieved. In the drawing, the positive lead terminal 12a is drawn so as to overlap the negative lead terminal 13a, but the relationship between the upper and lower overlaps is of course arbitrary.

  In addition, the positive and negative lead terminals 12a and 13a led out from the electrodes 11 inserted into the recesses 17 and 18 at the left and right ends are led out from the both ends in the longitudinal direction of the storage bodies 15 and 16 to the outside of the storage body. It has become. In the figure, a negative lead terminal 13a is led out on the right hand side of the figure, and a positive lead terminal 12a is led out on the left hand side.

  When the lower storage body 15 in the state where the power generation element 20 is stored is covered with the upper storage body 16, the upper half of the electrode 11 protruding from the surface (upper surface 15b) of the lower storage body 15 is The housings 15 and 16 in this state are inserted into the recesses 18 of the facing surface 16b of the upper housing 16 and are thermally bonded.

  Thus, as in the case of the first embodiment, both the positive and negative lead terminals 12a, 13a are led out in a straight line in opposite directions from both end faces in the longitudinal direction of the storage bodies 15, 16 in the second embodiment. A thin battery module is formed. In this thin battery module, the power generation element 20 housed in the thin battery module is restrained vertically and horizontally by the housing bodies 15, 16, so that even if the module receives an impact, the power generation element 20 is restrained by the housing bodies 15, 16. Therefore, no large vibration is transmitted to the electrode 11, and therefore the electrical connection between the lead terminals 12a and 13a is not broken, and the lead terminals 12a and 13a are not mechanically damaged.

  Also in this case, the overlap of the lead terminals 12a and 13a led out from the adjacent electrodes 11 does not need to be particularly bonded before the heat bonding between the storage bodies 15 and 16, and the heat of the upper and lower storage bodies 15 and 16 is not necessary. A bonded state that can ensure electrical continuity can be obtained by the pressure-bonding force at the time of bonding.

  Also in the present embodiment, what is essential is the same as in the first embodiment, FIG. 3B for housing the power generation element 20, the concave portion 17 on the surface of the lower housing 15 in FIG. 4, and FIG. 4), the concave portion 18 of the opposing surface 16b of the upper storage body 16 in FIG. 4 has an inner peripheral shape in which the electrode 11 of the power generation element 20 fits snugly, and the electrode 11 is inserted into the concave portions 17 and 18, By covering with the upper storage body 16, the electrode 11 has a dimension and shape that is restrained in the vertical and horizontal directions.

  In the above embodiment, the recesses 7 and 17 provided in the storage bodies 5, 6, 15 and 16 are only for the electrode portions 1 and 11 of the power generation elements 10 and 20, but an electric vehicle or the like In the case of a large-capacity battery module mounted on the lead terminal 2a, 3a, 12a, 13a, the thickness of the lead terminals 2a, 3a, 12a, 13a is also increased. In this case, it is preferable to provide a recess for the lead terminal. Otherwise, when the power generation elements 10 and 20 are sandwiched between the pair of storage bodies 5 and 6 (15 and 16), the lead terminals 2a, 3a, 12a and 13a may be strongly pressed and damaged. is there.

  Further, in the above embodiment, the electrolyte is transferred between the adjacent recesses 7 and 17 with the power generation elements 10 and 20 sealed in the storage bodies 5, 6, 15 and 16, and the lead terminals 2 a, 3 a, 12 a, In order to prevent inflow through 13a, as the thermoadhesive resin constituting the facing surfaces 5b, 6b, 15b, 16b side (the side where the recesses 7, 17 are formed) of the storage bodies 5, 6, 15, 16 It is preferable to use a metal adhesive resin. As a result, the metal lead terminals 2a, 3a, 12a, and 13a are bonded to the opposing surfaces 5b, 6b, 15b, and 16b of the storage bodies 5, 6, 15, and 16 to eliminate gaps that reach the recesses 7 and 17 side. And the inflow of the electrolyte can be prevented. As the metal adhesive resin, a film made of an acid-modified olefin resin graft-modified with an unsaturated carboxylic acid can be used.

  Similarly, in order to prevent the electrolyte from flowing into the adjacent recesses 7 and 17 along the lead terminals 2a, 3a, 12a and 13a, the lead terminal adhesiveness to the peripheral surface of each lead terminal 2a, 3a, 12a and 13a A film is adhered, and the lead terminals 2a, 3a, 12a, and 13a are adhered to the heat-adhesive resin layers of the storage bodies 5, 6, 15, and 16 by the adhesive action of the film to block the inflow of the electrolyte. There is also a method.

  However, in this latter case, the overlapping portion is not covered with the lead terminal adhesive film so that the electrical connection can be achieved so as not to hinder the electrical connection due to the overlapping of the lead terminals 2a, 3a, 12a, 13a. In addition, it is necessary to expose the lead terminals 2a, 3a, 12a, and 13a. In general, when the electrodes 1 and 11 are inserted into the recesses 7 and 17, the portions near the recesses 7 and 17, that is, the base portions led out from the electrodes 1 and 11 side are covered with an adhesive film, and lead terminals 2a The portion near the tip where 3a, 12a and 13a overlap is exposed.

  In addition, as this lead terminal adhesive film, it is preferable to use the film which laminated | stacked the acid-modified polyolefin layer in which at least one had metal adhesiveness on both surfaces of a polyethylene naphthalate film. Since the polyethylene naphthalate film of the intermediate layer is excellent in heat resistance, the aluminum foil layer and the lead terminals 2a, 3a, 12a, 13a in the storage bodies 5, 6, 15, 16 This is because the short circuit can be prevented.

  The present invention is widely applicable to general thin battery modules used for power sources of large equipment such as electric vehicles.

(A) is a schematic perspective view showing the external appearance of the power generation element mounted on the module of the first embodiment, and (b) is an exploded perspective view showing a storage body on which the power generation element is mounted. is there. These show the state which mounted the electric power generation element of 1st Embodiment in one side of the storage body shown in FIG. 1 by the disassembled perspective view. (A) is a schematic perspective view showing the external appearance of the power generation element mounted on the module of the second embodiment, and (b) is an exploded perspective view showing the storage body on which the power generation element is mounted. is there. These show the state which mounted the electric power generation element of 2nd Embodiment on one side of the storage body shown in FIG. 3 with an exploded perspective view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Electrode 1b, 11b Electrode upper surface 2a, 12a Positive electrode lead terminal 2b, 12b Upper surface of positive electrode lead terminal 3a, 13a Negative electrode lead terminal 3b, 13b Upper surface of negative electrode lead terminal 5, 15 Lower housing 5b , 15b Upper surface of the lower storage body 6, 16 Upper storage body 6b, 16b Opposing surface (to the lower storage body of the upper storage body) 7, 17 Storage recess 18 Storage recess (of the upper storage body) 10 , 20 Power generation elements

Claims (5)

  A pair of power generation elements having positive and negative electrode lead terminals which are stacked or wound and are led out in a direction opposite to each other from the periphery, and a pair of power generation elements sandwiched between and encapsulating the power generation elements The outer shape of the electrode of the power generation element is projected onto a plane perpendicular to the direction in which the pair of storage bodies are sandwiched, on at least one of the opposing surfaces sandwiching the power generation element. A plurality of storage recesses having an inner peripheral shape that can be inserted into the storage shape are juxtaposed in a straight line. When the electrodes are inserted into the storage recesses and the opposing surfaces of the pair of storage bodies are aligned, they are adjacent to each other. The lead terminals of the positive electrode and the negative electrode led out from the electrodes inserted in the storage recesses overlap in a straight line, and the electrodes are constrained by the storage recesses of the pair of storage bodies, and the pair of storage bodies Contains power generation elements Thin battery module having a peripheral edge, a structure in which lead terminals of the arrangement direction of both edges from the positive electrode and the negative electrode of the power generating element is derived but adhered Te.   2. The thin battery module according to claim 1, wherein a recess into which the lead terminal is fitted is provided in the housing body.   3. The thin battery module according to claim 1, wherein the pair of housings is made of a laminate packaging material in which a base material, an aluminum foil, and a heat-adhesive resin film are laminated and joined in this order. module.   4. The thin battery module according to claim 3, wherein the heat-adhesive resin film layer is a resin having metal adhesion.   The thin battery module according to claim 3 or 4, wherein the lead terminal adhesive film is coated on a peripheral surface of the lead terminal except for an overlapping portion with a lead terminal derived from an adjacent electrode. Thin battery module.

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