JP2009146797A - Battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently cool a battery module housed in a housing case. <P>SOLUTION: A plurality of battery cells 19 are laminated so that a positive electrode tab 29a and a negative electrode tab 29b may be alternately superposed, and are connected in series so that the positive electrode tab 29a and the negative electrode tab 29b on one end side of each of the adjoining battery cells 19 in lamination direction may be electrically connected in order. An insulating plate 33 is interposed with a spacing between the positive electrode tab 29a and the negative electrode tab 29b on the other end side of each of the adjoining battery cells 19 in lamination direction, and with the both tabs 29a, 29b of each of battery cells 19 and the insulating plate 33 in exposed state, each battery cells 19 are supported in alignment so as not to shift by a supporting frame member to constitute a battery module M. A plurality of battery modules M are housed in a housing case 1 having an inlet window to introduce temperature conditioning air inside. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a battery pack in which a plurality of battery modules, in which a plurality of battery cells are stacked so that positive electrode tabs and negative electrode tabs are alternately stacked and connected in series, are electrically connected and accommodated in an accommodation case. This relates to improvement, and in particular to cooling measures.

  In Patent Document 1, a plurality of battery cells in which a positive electrode tab protrudes from one end of a flat rectangular plate-shaped battery cell main body and a negative electrode tab protrudes outward from the other end are electrically connected to each other. In addition, a sleeve is inserted into a plurality of insulating plates in a skewered manner, and these insulating plates are interposed between adjacent upper and lower electrode tabs, and these are accommodated in a case composed of an upper case and a lower case, and the sleeve is accommodated in the sleeve. A battery module assembled by screwing a bolt from the outside of the case is disclosed.

A plurality of battery modules configured as described above are electrically connected and accommodated in an accommodation case to constitute a battery pack, and are used by being mounted on, for example, a hybrid vehicle or a fuel cell vehicle.
JP 2006-210312 A (paragraph 0013 column to paragraph 0016 column, FIGS. 2 and 4)

  However, in the battery module disclosed in Patent Document 1, since a plurality of battery cells are confined in the case, heat generated during charging and discharging may be trapped in the case and adversely affect battery cell performance. . In particular, in the case of a hybrid vehicle or the like that consumes a large amount of power and generates a large amount of heat, it is necessary to take care to cool the battery module (battery cell).

  This invention is made | formed in view of this point, The place made into the objective is to cool the battery module accommodated in the storage case efficiently.

  In order to achieve the above object, the present invention is characterized in that temperature-controlled air is introduced from the outside of the housing case between electrode tabs adjacent in the stacking direction of a plurality of battery cells, specifically, The following solutions were taken.

  That is, the invention according to claim 1 includes a flat rectangular plate-shaped battery cell body in which the power generation element is sealed with an exterior material, and a positive electrode tab of the + electrode projects outward from one end of the battery cell body. In addition, a plurality of battery cells in which negative electrode tabs of the electrode protrude outward from the other end are stacked so that the positive electrode tabs and the negative electrode tabs alternately overlap, and the battery cells adjacent to each other in the stacking direction are stacked. A range in which the positive electrode tab and the negative electrode tab on one end side are connected in series so that the positive electrode tab and the negative electrode tab are electrically connected in sequence, and the positive electrode tab and the negative electrode tab overlap at least between the positive electrode tab and the negative electrode tab on the non-connection side. The battery cells are adjacent to each other in the stacking direction so as to be positioned at a gap between the positive electrode tab and the negative electrode tab on each other side, and the battery cells expose both tabs and the insulating plate. With no alignment means A plurality of battery modules are housed in a housing case having an introduction window for introducing temperature-controlled air therein and electrically connected to each other. .

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the gap between the positive electrode tab and the negative electrode tab of the battery cell is provided corresponding to the introduction window of the housing case. To do.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the insulating plate has protrusions for holding a gap between the positive electrode tab and the negative electrode tab of the battery cell. It is characterized by projecting toward.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the temperature control air is introduced into the gap between the positive electrode tab and the negative electrode tab of the battery cell in the insulating plate. A fin is provided.

  According to the invention according to claim 1, the insulating plate is interposed between the positive electrode tab and the negative electrode tab adjacent to each other in the stacking direction of the plurality of battery cells, and the positive electrode tab of each battery cell and Since the negative electrode tab and the insulating plate are exposed from the aligning means, and the temperature-controlled air is introduced into the inside through the introduction window of the accommodation case, the temperature-controlled air introduced into the accommodation case is connected to the positive electrode tab of each battery cell. The battery module is smoothly distributed between the negative electrode tab and the battery module accommodated in the accommodation case can be efficiently cooled.

  According to the invention of claim 2, since the temperature-controlled air introduced into the housing case from the introduction window is introduced without detouring into the gap between the positive electrode tab and the negative electrode tab of the battery cell, the battery module The cooling efficiency can be increased.

  According to the invention concerning Claim 3, the clearance gap between the positive electrode tab of a battery cell and a negative electrode tab is ensured by protrusion of an insulating plate, and the cooling efficiency of a battery module can be improved more.

  According to the invention of claim 4, the temperature-controlled air introduced into the housing case from the introduction window is reliably introduced into the gap between the positive electrode tab and the negative electrode tab of the battery cell by the fins of the insulating plate. The cooling efficiency of the battery module can be further increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 and 2 show a battery pack P according to Embodiment 1 of the present invention. The battery pack P is used, for example, mounted under a floor under a seat of a hybrid vehicle or a fuel cell vehicle, but is not limited to this, and may be mounted on other vehicles. Even if it is not, it is applicable.

  The battery pack P includes a rectangular box-shaped resin storage case 1 and six battery modules M stored in the storage case 1.

  The housing case 1 includes a rectangular plate-shaped base member 3 and a rectangular shallow dish-shaped cover member 5 that covers the base member 3 from above and houses the battery modules M therein.

  As shown in FIG. 5, the base member 3 has each of the battery modules so that six rectangular placement portions 3 a slightly protrude (half the thickness of a battery cell body 23 (sealing portion 25) described later). Three pieces are formed in two rows in the front and rear corresponding to the installation location of M. In addition, the base member 3 is provided with two blocking walls 7 so as to stand between adjacent battery modules M across two battery module M rows in the front and rear, and a partition wall on one end side. 9 stands upright between the switch box 11 (see FIG. 2) and the battery module M adjacent thereto. Further, a plurality of bolt insertion holes 3b for fixing the battery modules M and the cover member 5 are formed around the outer peripheral edge of the base member 3 and around the mounting portions 3a.

  The cover member 5 includes a top plate 13 having ribs 13a arranged in a grid pattern, and four side plates 15 integrally formed on the outer peripheral edge of the top plate 13, and these blocking walls 7 and The upper end of the partition wall 9 does not reach the back surface of the top plate 13 and the interior of the housing case 1 is continuous throughout. In addition, on one side plate 15 on the long side, an introduction window 17 for introducing temperature-controlled air into the housing case 1 is provided between adjacent battery modules M in the battery module M row, in the vicinity of the partition wall 9 and on one short side. It is formed at six places corresponding to the vicinity of the side. The side plate 15 has a plurality of bolt insertion holes 15 a corresponding to the bolt insertion holes 3 b of the base member 3. Although not shown, a blower (not shown) is connected to the inside of the housing case 1 by piping, and temperature control air is derived from the inside of the housing case 1 by the operation of the blower.

  On the other hand, each battery module M includes, as shown in FIGS. 3, 4 and 6, a plurality of battery cells 19 stacked vertically and an alignment means interposed between battery cells 19 adjacent in the stacking direction. As a resin holding frame member 21.

  Each of the battery cells 19 is, for example, a chargeable / dischargeable lithium ion secondary battery or the like, and includes a flat rectangular plate-shaped battery cell body 23 in which a power generation element (not shown) is sealed with an exterior material, The battery cell main body 23 includes a sealing portion 25 that seals the power generation element, and an overhang portion 27 that projects to the outer side of the sealing portion 25 over the entire circumference. The positive electrode tab 29a of the + electrode is integrally formed at one end of the sealing part 25 of the battery cell body 23 so as to protrude outward, and the negative electrode tab 29b of the negative electrode is formed at the other end. It is integrally formed so that it may protrude in the direction. Hereinafter, for convenience of description, the positive electrode tab 29a and the negative electrode tab 29b may be referred to as “electrode tabs”. The plurality of battery cells 19 are stacked such that the positive electrode tabs 29a and the negative electrode tabs 29b alternately overlap, and the positive electrode tabs 29a and the negative electrode tabs 29b on one end side of each of the battery cells 19 adjacent in the stacking direction Are welded using an ultrasonic welding jig so as to be sequentially connected electrically and connected in series.

  On the other hand, the holding frame member 21 includes a rectangular annular frame-shaped holding portion 31 that holds the protruding portion 27 of the battery cell 19, and the battery cell main body 23 is sealed inside the frame-shaped holding portion 31. A rectangular opening 31a for fitting and positioning the stopper 25 is formed. An insulating plate 33 is integrally formed at one end of the holding frame member 21, and a gap between the positive electrode tab 29 a and the negative electrode tab 29 b of the battery cell 19 is held at substantially the center of both surfaces of the insulating plate 33. Protrusions 26 for projecting are integrally projected toward the positive electrode tab 29a and the negative electrode tab 29b. Further, the holding frame member 21 is integrally formed with two extending portions 35 extending outward of the frame-shaped holding portion 31 so as to correspond to the non-tab side of the battery cell 19. . In each of the extending portions 35, three bolt insertion holes 35 a are formed at intervals so as to correspond to the bolt insertion holes 3 b around the mounting portion 3 a of the base member 3, and engaging protrusions 35b and the engagement hole 35c are formed at diagonal positions, respectively. Further, at both ends of each of the extending portions 35, a harness holding portion 39 for holding a voltage detecting harness 37 connected to the electrode tab for detecting the voltage of the battery cell 19 is formed in a rectangular shape. The holding portion 39 is formed with a slit 39a for inserting the harness 37.

  The plurality of battery cells 19 are stacked one above the other and connected in series, and a holding frame member 21 is provided between the battery cells 19 adjacent to each other in the stacking direction. It is interposed between the tab 29a and the negative electrode tab 29b. In this state, the insulating plate 33 is positioned between the positive electrode tab 29a and the negative electrode tab 29b on the non-connection side in a range that overlaps at least the positive electrode tab 29a and the negative electrode tab 29b, and each of the battery cells 19 adjacent in the stacking direction. Is interposed with a gap between the positive electrode tab 29a and the negative electrode tab 29b on the other end side. In other words, the insulating plates 33 are alternately arranged in opposite directions. In this example, the insulating plate 33 extends outward from the electrode tab. Further, the engaging projections 35b and the engaging holes 35c of the holding frame members 21 (extending portions 35) adjacent in the stacking direction are engaged with each other, and each extending portion 35 of the holding frame member 21 is connected to the battery. The battery cells 19 are aligned and held by the holding frame member 21 in a state where both the tabs 29a and 29b and the battery cell 19 are exposed, while being superposed on each other outside the overhanging portion 27 of the cell body 23. The Thereby, the battery module M is comprised. Further, the harness 37 is connected to the electrode tab of the battery cell 19 and is inserted and held in the harness holding portion 39.

  As shown in FIG. 3, the battery module M configured in this manner is placed on the placement portion 3a of the base member 3, and the cushion material 41 is placed on the top, and further the bolt insertion hole 43a is provided thereon. The pressure plate 43 is placed, and the bolt 47 is inserted from below the base member 3 through the sleeve 45 into the bolt insertion holes 43a, 35a, 3b of the pressure plate 43, the holding frame member 21 and the base member 3, A nut 49 is screwed into the shaft portion of the bolt 47. Thereby, the battery module M is fixed to the base member 3, and in this fixed state, the tightening force of the bolts 47 acts evenly on the entire surface of each battery cell 19 through the pressure plate 43 and the cushion material 41, and is sealed. The gas generated in the portion 25 is evenly dispersed, and the battery cell 19 is not pressed and expanded. Therefore, the tying member 51 is constituted by the cushion material 41, the pressure plate 43, the sleeve 45, the bolt 47 and the nut 49.

  The six battery modules M attached to the base member 3 in this way are electrically connected in series or in parallel so that the positive electrode tab 29a and the negative electrode tab 29b face each other, or mixed in series and parallel. The CPU board 53 (see FIG. 2) is placed on the battery module M and electrically connected thereto.

  Then, the cover member 5 is put on the base member 3 from above, and the bolts 47 are inserted into the bolt insertion holes 15a and 3b of the cover member 5 and the base member 3 and screwed into nuts (not shown), A battery pack P in which the battery module M is accommodated in the accommodation case 1 is configured. In this state, the gap between the positive electrode tab 29a and the negative electrode tab 29b of the adjacent battery module M corresponds to the introduction window 17 of the cover member 5, and the electrode tab is cooled by the introduced temperature control air. .

  As described above, in the first embodiment, the insulating plate 33 is interposed between the positive electrode tab 29a and the negative electrode tab 29b adjacent to each other in the stacking direction of the plurality of battery cells 19, and each battery cell. Since the 19 positive electrode tabs 29 a and the negative electrode tab 29 b and the insulating plate 33 are exposed from the holding frame member 21 and the temperature-controlled air is introduced into the interior through the introduction window 17 of the housing case 1, the air is introduced into the housing case 1. The temperature-controlled air thus smoothly spreads between the positive electrode tab 29a and the negative electrode tab 29b of each battery cell 19, and the battery module M housed in the housing case 1 can be efficiently cooled.

  Furthermore, in the first embodiment, the temperature-controlled air introduced into the housing case 1 from the introduction window 17 is introduced without detouring into the gap between the positive electrode tab 29a and the negative electrode tab 29b of the battery cell 19. The cooling efficiency of the battery module M can be increased.

  In the first embodiment, the gap between the positive electrode tab 29a and the negative electrode tab 29b of the battery cell 19 is secured by the protrusion 26 of the insulating plate 33, and the cooling efficiency of the battery module M can be further increased.

  In addition, in the first embodiment, the holding frame member 21 having the insulating plate 33 at one end is interposed between the battery cells 19 adjacent to each other so that the both battery cells 19 are not displaced by the holding frame member 21. And the insulating plate 33 is disposed between one positive electrode tab 29a and the other negative electrode tab 29b of both battery cells 19.

  Therefore, by merely interposing the holding frame member 21 between the vertically adjacent battery cells 19, the plurality of battery cells 19 can be stacked and assembled vertically so as not to be misaligned. In addition, since the holding frame member 21 for positioning the battery cell 19 and the insulating plate 33 are integrated, the number of components is reduced by that amount, and the battery module M and thus the battery pack P can be provided at low cost.

  Further, in the first embodiment, the protruding portion 27 of the battery cell body 23 is placed in the state where the sealing portion 25 of the battery cell body 23 is fitted in the opening 31a of the holding frame member 21 adjacent to the upper and lower sides. Since both the holding frame members 21 are sandwiched and held by the frame-like holding portions 31 and the extending portions 35 of the both holding frame members 21 are overlapped with each other outside the overhanging portion 27, the battery cells 19 are held. The frame member 21 can be stably held while being positioned.

  Moreover, in this Embodiment 1, since the harness holding | maintenance part 39 holding the harness 37 for electric detection is provided in the holding frame member 21, the number of parts can be reduced compared with the case where a harness holding part is provided separately. it can.

  Furthermore, in the first embodiment, even if the adjacent battery modules M are arranged close to each other, since the blocking wall 7 exists between them, the electrode tabs do not come into contact with each other, and a short circuit due to an impact action is prevented. The battery pack P can be downsized. Further, since the upper ends of the blocking wall 7 and the partition wall 9 are separated from the back surface of the cover member 5 (top plate 13) of the housing case 1, the temperature-controlled air can be spread over the entire interior of the housing case 1, and cooling is performed. Efficiency can be improved.

(Embodiment 2)
7 and 8 show a battery module M applied to the battery pack according to the second embodiment. Also in the second embodiment, the battery module M is housed in the housing case 1 in which the introduction window 17 is formed as in the first embodiment, but the housing case 1 is not shown here (FIGS. 1 and 2). reference). For convenience of explanation, the description will be made with reference to FIGS. 1 and 2 of the first embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals. Although the number of bolt insertion holes 3b around the battery module M mounting portion of the base member 3 is six in the first embodiment, the number of bolts 47 in the second embodiment is four, which is two less than the number of bolts 47 in the second embodiment. .

  As shown in FIGS. 7 to 13, the battery module M has a plurality of battery cells 19 stacked one above the other, a plurality of resin insulating plates 33 described later, and the battery cells 19 and the insulating plates 33 aligned. And a carry case 22 as alignment means for holding.

  Since each of the battery cells 19 is configured in the same manner as in the first embodiment, the same reference numerals are given to the same components and description thereof is omitted. As in the first embodiment, the battery cells 19 are stacked such that the positive electrode tabs 29a and the negative electrode tabs 29b are alternately stacked, and the positive electrode tabs 29a and the negative electrodes on one end side of each of the battery cells 19 adjacent to each other in the stacking direction. The tabs 29b are welded using an ultrasonic welding jig 24 (see FIG. 13) so as to be electrically connected sequentially and are connected in series.

  On the other hand, at the base end of the insulating plate 33, as shown in FIGS. 10 and 11, a linear bulging portion 34 is integrally formed over the entire width direction. In addition, guide portions 36 having substantially L-shaped guide grooves 36a are integrally formed on both side ends of the insulating plate 33, and one of the guide portions 36 is further provided with an L-shaped frame. The portion 38 is integrally formed with the guide portion 36 so as to have a U-shaped recess 38a. Furthermore, fins 28 for introducing temperature-controlled air into the gaps between the positive electrode tab 29a and the negative electrode tab 29b of the battery cell 19 are integrally formed at both ends of the tip of the insulating plate 33, respectively.

  The carry case 22 includes a rectangular bottom plate portion 40 on which a plurality of battery cells 19 are stacked and placed. At the four corners of the bottom plate portion 40, plate-like first movement restricting portions 42 each having a substantially L shape in plan view are integrally provided, and the first movement restricting portions 42 allow the battery cells 19 to be viewed from above. While permitting insertion, movement of each battery cell 19 is restricted in the horizontal direction in the inserted state. Further, in this inserted state, the battery cell main body 23 of each battery cell 19 is exposed to the side, and the positive electrode tab 29a and the negative electrode tab 29b protrude outward.

  Further, in the vicinity of the four corners of the bottom plate portion 40, plate-like second movement restricting portions 44 that are substantially L-shaped in plan view are erected integrally so as to be continuous with the first movement restricting portion 42, respectively. The movement restricting portion 44 allows insertion of the insulating plates 33 from above and restricts the movement of the insulating plates 33 in the horizontal direction in the inserted state. In other words, the insulating plate 33 is disposed above the second movement restricting portions 44 adjacent to each other on the short side, and the second movement restricting portion 44 is inserted into the guide groove 36a of the guide portion 36 so that the insulating plate 33 is horizontally oriented. The movement is restricted. In this inserted state, the frame portion 38 and the guide portion 36 approach the first movement restriction portion 42, the open side of the guide groove 36 a faces the first movement restriction portion 42, and the voltage of the battery cell 19 therebetween. A harness holding portion 46 formed of a rectangular space for holding a voltage detection harness 37 connected to the electrode tab is formed.

  The plurality of battery cells 19 are stacked one above the other and connected in series, and an insulating plate 33 is provided between the battery cells 19 adjacent to each other in the stacking direction. A gap is provided between 29a and the negative electrode tab 29b. In this state, the insulating plate 33 is positioned between the positive electrode tab 29a and the negative electrode tab 29b on the non-connection side so as to overlap at least the positive electrode tab 29a and the negative electrode tab 29b. In this example, the insulating plate 33 extends outward from the electrode tab. That is, the insulating plates 33 are alternately arranged in opposite directions, and the linear bulging portion 34 is provided at the base end so that a gap is formed between the upper and lower electrode tabs. . Thus, the battery cells 19 and the insulating plates 33 are aligned and held by the first and second movement restricting portions 42 and 44 so as not to be displaced.

  The assembly procedure is as follows. First, with the battery cell 19 placed on the bottom plate portion 40 of the carry case 22, the insulating plate 33 is disposed above the second movement restricting portion 44 at one end, and the insulating plate 33 (guide) The second movement restricting portion 44 is inserted into the guide groove 36a of the portion 36), the insulating plate 33 is attached to the second movement restricting portion 44, and the insulating plate 33 is overlaid on one electrode tab.

  Next, the battery cell 19 is placed thereon so that the positive electrode / negative electrode of the electrode tab are opposite to the electrode tab of the battery cell 19 on which the battery cell 19 is previously placed. In this state, electrode tabs adjacent to each other on the non-insulating plate 33 side are welded by the ultrasonic welding jig 24 (see FIG. 13).

  Thereafter, the insulating plate 33 is stacked on the welded electrode tab side in the same manner as described above, and then the battery cell 19 is placed thereon so that the positive electrode / negative electrode of the electrode tab are opposite to the electrode tab of the battery cell 19 below. Placed on. In this state, the electrode tabs adjacent on the upper and lower sides on the non-insulating plate 33 side are welded by the ultrasonic welding jig 24. By repeating this operation, the plurality of battery cells 19 and the insulating plate 33 are stacked one above the other.

  In addition, with the insulating plate 33 attached to the second movement restricting portion 44, a harness holding portion 46 is formed between the insulating plate 33 and the first movement restricting portion 42, and the harness 37 is used as an electrode tab of the battery cell 19. The battery module M is configured by being connected and inserted and held in the harness holding portion 46.

  With reference to FIG. 3 of the first embodiment, the battery module M configured as described above is placed at the place where the base member 3 is placed, the cushion material 41 is placed on the top, and the bolt insertion hole is further provided thereon. A pressure plate 43 having 43a is placed, and a bolt 47 is inserted into the pressure plate 43 and the bolt insertion holes 43a and 3b of the base member 3 through the sleeve 45 from below the base member 3, and the shaft portion of the bolt 47 A nut 49 is screwed to the nut. The second embodiment is different from the first embodiment in that the sleeve 45 (bolt 47) is exposed to the outside of the battery module M. Thereby, the battery module M is fixed to the base member 3, and in this fixed state, the tightening force of the bolts 47 acts evenly on the entire surface of each battery cell 19 through the pressure plate 43 and the cushion material 41, and is sealed. The gas generated in the portion 25 is evenly dispersed, and the battery cell 19 is not pressed and expanded. Therefore, the tying member 51 is constituted by the cushion material 41, the pressure plate 43, the sleeve 45, the bolt 47 and the nut 49.

  The six battery modules M attached to the base member 3 in this manner are electrically connected in series or in parallel, or in series so that the positive electrode tab 29a and the negative electrode tab 29b face each other, as in the first embodiment. The CPU boards 53 (see FIG. 2) are placed on top of the battery module M and are electrically connected to each other so as to be mixed in parallel.

  1 and FIG. 2 of the first embodiment, the cover member 5 is covered on the base member 3 from above, and the bolt 47 is inserted into the bolt insertion holes 15a and 3b of the cover member 5 and the base member 3. Thus, a battery pack P in which six battery modules M are housed in the housing case 1 is formed by screwing into a nut (not shown). In this state, the introduction window 17 of the cover member 5 corresponds to the electrode tab of the adjacent battery module M, and the electrode tab is cooled by the introduced temperature control air.

  As described above, in the second embodiment, the temperature-controlled air introduced into the housing case 1 from the introduction window 17 is caused by the gap between the positive electrode tab 29a and the negative electrode tab 29b of the battery cell 19 by the fins 28 of the insulating plate 33. Therefore, the cooling efficiency of the battery module M can be further increased.

  Further, in the second embodiment, since the first movement restricting portion 42 is erected at a distance from the four corners of the bottom plate portion 40, the first movement restricting portion 42 is erected across the entire side of the bottom plate portion 40. The carry case 22 can be reduced in weight as compared with the case where the battery case 19 is made, and the side of the battery cell body 23 of each battery cell 19 is exposed without being covered with the first movement restricting portion 42, and the holding frame The cooling efficiency of the battery cell 19 can be improved as compared with the first embodiment in which the battery cell body 23 is hidden by the member 21.

  In the second embodiment, the plurality of battery cells 19 can be stacked and held on the bottom plate portion 40 so as not to be displaced only by being inserted into the first movement restricting portion 42 from above. Similarly, one positive tab 29a and the other negative tab 29b of the battery cells 19 that are adjacent to each other in the stacking direction are also arranged so that the plurality of insulating plates 33 are not displaced just by being inserted into the second movement restricting portion 44 from above. Can be kept in alignment.

  Therefore, the plurality of battery cells 19 and the insulating plate 33 can be stacked and assembled so as not to be displaced easily and quickly.

  Further, in the second embodiment, the first movement restricting portion 42 and the second movement restricting portion 44 are integrated with each other, so that they are mutually reinforced and have high rigidity as a whole. Therefore, even if the first and second movement restricting portions 42 and 44 are made small, rigidity is ensured, and thus the weight can be further reduced.

  Furthermore, in the second embodiment, since the harness holding portion 46 that holds the detection harness 37 is provided between the insulating plate 33 and the first movement restricting portion 42, it is easy to hold the detection harness 37. In addition, the number of parts can be reduced as compared with the case where a separate harness holding portion is provided.

  In addition, in the second embodiment, even if the adjacent battery modules M are arranged close to each other, since there is a blocking wall 7 between them, the electrode tabs do not contact each other, and a short circuit due to the action of an impact is prevented. The battery pack P can be downsized.

  In the first embodiment, the protrusions 26 are provided on the insulating plate 33, but the fins 28 of the second embodiment may be added. Also in the second embodiment, the fins 28 are provided on the insulating plate 33, but the protrusions 26 of the first embodiment may be added.

  The present invention provides a battery pack in which a plurality of battery modules, in which a plurality of battery cells are stacked so that positive electrode tabs and negative electrode tabs alternately overlap and are connected in series, are electrically connected and accommodated in an accommodation case. Useful.

FIG. 3 is a perspective view showing the battery pack before the cover member is attached in the first embodiment. It is a front view in the state where the battery module, CPU board, and switch box were attached to the base member in the first embodiment. FIG. 3 is a cross-sectional view corresponding to a line III-III in FIG. 2 showing a substantially half region of the battery module. 3 is a front view showing an electrode tab side of the battery module in Embodiment 1. FIG. 2 is a perspective view of a base member in Embodiment 1. FIG. 3 is a perspective view before assembly in which battery cells and holding frame members are alternately arranged in Embodiment 1. FIG. 6 is a perspective view of a battery module according to Embodiment 2. FIG. 6 is a front view showing an electrode tab side of a battery module in Embodiment 2. FIG. FIG. 3 is a perspective view before the carry case, the battery cell, and the insulating plate are assembled in the first embodiment. 10 is a plan view of an insulating plate in Embodiment 2. FIG. 6 is a perspective view of an insulating plate in Embodiment 2. FIG. FIG. 6 is a plan view of a state in which a battery cell and an insulating plate are assembled to a carry case in the second embodiment. FIG. 10 is an explanatory diagram showing a procedure for assembling a battery cell and an insulating plate to a carry case in the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Storage case 17 Introduction window 19 Battery cell 21 Holding frame member (alignment means)
22 Carrying case (alignment means)
23 Battery cell body 29a Positive electrode tab 29b Negative electrode tab 33 Insulating plate M Battery module P Battery pack 26 Projection 28 Fin

Claims (4)

The power generation element includes a flat rectangular plate-shaped battery cell body sealed with an exterior material, and a positive electrode positive electrode tab protrudes outward from one end of the battery cell main body, and a negative electrode tab of the negative electrode from the other end. Are stacked such that the positive electrode tabs and the negative electrode tabs alternately overlap, and the positive electrode tab and the negative electrode tab on one end side of each of the battery cells adjacent in the stacking direction, Are connected in series so that they are electrically connected in series, and the insulating plates are adjacent to each other in the stacking direction so that they are located between the positive electrode tab and the negative electrode tab on the non-connection side so as to overlap at least the positive electrode tab and the negative electrode tab. A cell is interposed with a gap between the positive electrode tab and the negative electrode tab on the other end side of each cell, and the battery cells are aligned and held by the alignment means with both tabs and the insulating plate exposed. Battery module Configure the Yuru,
A battery pack characterized in that a plurality of the battery modules are housed in a housing case having an introduction window for introducing temperature-controlled air therein and are electrically connected to each other. The battery pack according to claim 1,
The battery pack, wherein the gap between the positive electrode tab and the negative electrode tab of the battery cell is provided corresponding to the introduction window of the housing case. The battery pack according to claim 1 or 2,
A battery pack, wherein a protrusion for holding a gap between a positive electrode tab and a negative electrode tab of a battery cell is provided on the insulating plate so as to protrude toward the positive electrode tab and the negative electrode tab. The battery pack according to any one of claims 1 to 3,
A battery pack, wherein the insulating plate is provided with fins for introducing temperature-controlled air into a gap between the positive electrode tab and the negative electrode tab of the battery cell.

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