JP2009146796A - Carrying case of battery module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carrying case of a battery module capable of assembling simply and rapidly. <P>SOLUTION: A plurality of battery cells 19 are laminated on a bottom plate part 40 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. A first movement regulating part 42 installed on the bottom plate part 40 allows insertion of each of the battery cells 19 from the upper part and regulates its movement in horizontal direction with the battery cells 19 in inserted state. An insulating plate 33 is interposed 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. In this case, a second movement regulating part 44 installed on the bottom plate part 40 allows insertion of the insulating plate 33 from the upper part and regulates its movement in horizontal direction with the insulating plate 33 in inserted state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an improvement in a carry case of a battery module in which a plurality of battery cells are stacked such that positive electrode tabs and negative electrode tabs are alternately overlapped and connected in series, and particularly to an assembly measure.

  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 above-mentioned Patent Document 1, since a plurality of insulating plates are positioned by inserting sleeves, the assembly process is complicated. Further, at the time of assembly, although the insulating plate is positioned by inserting the sleeve, since the battery cells are simply stacked one above the other, there is a risk of displacement and assembly workability is reduced.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a battery module carry case that can be easily and quickly assembled.

  In order to achieve the above object, the present invention is characterized in that the battery cell and the insulating plate are aligned and held so as not to be displaced by a common alignment means. Specifically, the following solution means is provided. It was.

  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 bottom plate portion on which a plurality of battery cells in which a negative electrode tab of the electrode protrudes outward from the other end is stacked and placed on the bottom plate portion, from above each of the battery cells. A first movement restricting portion that allows insertion of each battery cell in a horizontal direction in an inserted state; and is installed on the bottom plate portion to allow insertion from above the insulating plate, and A second movement restricting portion that restricts movement in the horizontal direction in the inserted state, and the battery cells are stacked and placed on the bottom plate portion so that the positive electrode tabs and the negative electrode tabs are alternately overlapped, and in the stacking direction. Positive electrode tab on one end side of each adjacent battery cell And the negative electrode tab are connected in series so that they are electrically connected sequentially, and the insulating plate is positioned between the positive electrode tab and the negative electrode tab on the non-connection side so as to be positioned in a range at least overlapping the positive electrode tab and the negative electrode tab. The battery cells and the insulating plates are placed between the positive electrode tab and the negative electrode tab on the other end side of each adjacent battery cell so that the battery cells and the insulating plates are not misaligned by the first and second movement restricting portions. The battery module is constituted.

  The invention according to claim 2 is the invention according to claim 1, wherein the first movement restricting portion is erected at the four corners of the bottom plate portion so that the battery cell main body of each battery cell is exposed to the side. It is characterized by that.

  The invention according to claim 3 is the invention according to claim 1 or 2, characterized in that the first movement restricting portion and the second movement restricting portion are integrally continuous.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the voltage detection for detecting the voltage of the battery cell between the insulating plate and the first movement restricting portion. A harness holding part for holding the harness for use is provided.

  According to the first aspect of the present invention, the plurality of battery cells are aligned and held only by being inserted into the first movement restricting portion from above, stacked on the bottom plate portion, and are not displaced. Similarly, the plurality of insulating plates are also aligned and held between the positive electrode tab and the other negative electrode tab of the battery cells adjacent in the stacking direction only by being inserted into the second movement restricting portion from above, and are not displaced.

  Therefore, a plurality of battery cells and insulating plates can be stacked and assembled so as not to be displaced easily and quickly.

  According to the invention which concerns on Claim 2, since the 1st movement control part is each standing at the four corners of the baseplate part at intervals, compared with the case where it stands up over the whole one side of the baseplate part. The weight of the carry case can be reduced. Moreover, since the battery cell main body side of each battery cell is exposed without being covered with the 1st movement control part, a battery cell can be cooled efficiently.

  According to the invention which concerns on Claim 3, a 1st movement control part and a 2nd movement control part mutually reinforce, and rigidity improves as a whole. Therefore, even if the first and second movement restricting portions are made small, the rigidity is ensured, and the weight can be further reduced.

  According to the invention which concerns on Claim 4, since the harness holding part holding the harness for electric detection is provided between the insulating plate and the 1st movement control part, holding | maintenance of the electric harness for detection is easy and quick. In addition, the number of parts can be reduced as compared with the case where a separate harness holding portion is provided.

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

  1 and 2 show a battery pack P. FIG. 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. 4, the base member 3 is provided with two blocking walls 7 erected so as to stand between adjacent battery modules M across two battery module M rows. On the side, a partition wall 9 is erected so as to stand between the switch box 11 (see FIG. 2) and the battery module M adjacent thereto. Further, a plurality of bolt insertion holes 3 b for fixing the battery modules M and the cover member 5 are formed around the outer peripheral edge of the base member 3 and the mounting portions of the battery modules M.

  The cover member 5 is composed of a top plate 13 having ribs 13a arranged in a grid pattern, and four side plates 15 formed integrally with the outer peripheral edge of the top plate 13, and one long side side. In the side plate 15, an introduction window 17 for introducing temperature-controlled air into the housing case 1 corresponds to between the adjacent battery modules M in the battery module M row, near the partition wall 9, and near one short side. It is formed in the place. 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, as shown in FIGS. 3 and 5 to 7, each of the battery modules M includes a plurality of battery cells 19 stacked vertically, a plurality of resin insulating plates 33 described later, and these battery cells. 19 and the carry case 22 according to this embodiment for holding the insulating plate 33 in alignment.

  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 on the outer side at the other end. Are integrally formed to project. 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 so that the positive electrode tabs 29a and the negative electrode tabs 29b are alternately overlapped, and the positive electrode tabs 29a and the negative electrode tabs 29b on one end side of each of the battery cells 19 adjacent to each other in the stacking direction. Are welded using an ultrasonic welding jig 24 (see FIG. 10) so as to be sequentially connected electrically and connected in series.

  On the other hand, as shown in FIG. 8, a linear bulging portion 34 is integrally formed at the base end of the insulating plate 33 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.

  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. 29a and a 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, 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 (see FIG. 10).

  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.

  As shown in FIGS. 3 and 4, the battery module M configured as described above is placed on the place where the base member 3 is placed, and the cushion material 41 is placed on the uppermost part, and a 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. 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 placed 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 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 this 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.

  Furthermore, in this 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 it is. Moreover, since the battery cell main body 23 side of each battery cell 19 is exposed without being covered with the 1st movement control part 42, the cooling efficiency of the battery cell 19 can be improved.

  Moreover, in this embodiment, since the 1st movement control part 42 and the 2nd movement control part 44 are made into one body, both mutually reinforce and it is highly rigid 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 this 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, the detection harness 37 can be easily and easily held. This can be done quickly, and the number of parts can be reduced compared to the case where a separate harness holding portion is provided.

  In addition, in this 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. In addition, the battery pack P can be downsized.

  The present invention is useful for a carry case of a battery module in which a plurality of battery cells are stacked so that positive electrode tabs and negative electrode tabs are alternately overlapped and connected in series.

It is a perspective view which shows the battery pack before attaching a cover member in 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 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. It is a perspective view of the base member in an embodiment. It is a perspective view of the battery module in an embodiment. It is a front view which shows the electrode tab side of a battery module in embodiment. It is a perspective view before the assembly of a carry case, a battery cell, and an insulation plate in an embodiment. It is a top view of the insulating plate in an embodiment. It is a top view of the state which assembled the battery cell and the insulating plate in the carry case in embodiment. It is explanatory drawing which shows the assembly | attachment procedure of the battery cell with respect to a carry case and an insulating plate in embodiment.

Explanation of symbols

19 battery cell 22 carry case 23 battery cell main body 29a positive electrode tab 29b negative electrode tab 33 insulating plate 37 harness 39 harness holding part 40 bottom plate part 42 first movement restricting part 44 second movement restricting part M battery module

Claims (4)

The power generation element includes a flat rectangular plate-shaped battery cell main 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. A bottom plate portion on which a plurality of battery cells protruding outward are stacked and placed;
A first movement restricting portion which is erected on the bottom plate portion, allows insertion of the battery cells from above, and restricts movement of the battery cells in the horizontal direction in the inserted state;
A second movement restricting portion that is erected on the bottom plate portion, allows insertion from above the insulating plate, and restricts movement of the insulating plate in the horizontal direction in the inserted state;
The battery cells are stacked and placed on the bottom plate portion so that the positive electrode tabs and the negative electrode tabs are alternately overlapped, and the positive electrode tab and the negative electrode tab on one end side of each battery cell adjacent in the stacking direction are electrically connected. Of the battery cells adjacent to each other in the stacking direction so that they are connected in series so as to be sequentially connected, and the insulating plate is positioned 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. Each battery cell and each insulating plate are interposed between the positive electrode tab and the negative electrode tab on each other end side, and are arranged and held so as not to be displaced by the first and second movement restricting portions, thereby forming a battery module. A battery module carrying case. In the carry case of the battery module according to claim 1,
The battery module carrying case, wherein the first movement restricting portion is erected at the four corners of the bottom plate portion so that the battery cell main body of each battery cell is exposed to the side. In the carry case of the battery module according to claim 1 or 2,
The battery module carry case, wherein the first movement restricting portion and the second movement restricting portion are integrally continuous. In the carry case of the battery module according to any one of claims 1 to 3,
A carry case for a battery module, wherein a harness holding part for holding a voltage detection harness for detecting a voltage of a battery cell is provided between the insulating plate and the first movement restricting part.

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