JP2014060111A - Assembled battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembled battery that prevents wrong assembly of battery modules and has a compact size.SOLUTION: An assembled battery 1 includes adjacent battery modules 2B, 2C each having a positive output terminal 131 and a negative output terminal 132. The battery modules 2B, 2C have projections 21, 22 disposed on one side and the other, respectively, of a first virtual straight line VL1 passing through the terminal 131 of the battery module 2B and the terminal 132 of the battery module 2C, and projections 22, 21 disposed on one side and the other, respectively, of a second virtual straight line VL2 passing through the terminal 132 of the battery module 2B and the terminal 131 of the battery module 2C. The assembled battery 1 further includes a connection member 30B for connecting the terminal 131 of the battery module 2B and the terminal 132 of the battery module 2C. The connection member 30B has notch portions 31, 32 for receiving the projections 21, 22 of the battery module 2B, respectively.

Description

  The present invention relates to an assembled battery having a plurality of battery modules.

  In order to easily connect batteries without making a mistake in polarity, an assembled battery including a plurality of secondary batteries each having a positive electrode connecting portion and a negative electrode connecting portion having connecting portions of complementary interpolation shapes is known (for example, Patent Document 1).

JP 2010-80355 A

  In the above assembled battery, since the connecting portion of the insulating member newly added to the secondary battery protrudes along the stacking direction of the secondary battery, there is a problem that the assembled battery becomes large.

  The problem to be solved by the present invention is to provide an assembled battery that can prevent the battery module from being assembled incorrectly and can be miniaturized.

  The present invention is provided on one side around a first imaginary straight line connecting a positive terminal of a first battery module and a negative terminal of a second battery module adjacent to the first battery module, and is the same as the positive terminal. A positive projection protruding in the direction and a second imaginary straight line connecting the negative terminal of the first battery module and the positive terminal of the second battery module on one side and projecting in the same direction as the negative terminal A first receiving part for receiving the positive electrode side protrusion, and a second receiving part for receiving the negative electrode side protrusion. The above-mentioned problem is solved by connecting the battery modules to each other with a connecting member.

  According to the present invention, when the first and second battery modules are stacked with the directions reversed alternately, the first receiving portion of the connection member receives the first positive electrode side protrusion of the first battery module. If the second receiving part of the connecting member does not receive the second negative electrode side protrusion of the second battery module, the first and second battery modules cannot be electrically connected to each other. Can prevent sticking.

  The first receiving portion of the connecting member receives a first positive electrode side protrusion protruding in the same direction as the first positive electrode terminal of the first battery module, and the second receiving portion is the second battery module. Since the second negative electrode side protrusion protruding in the same direction as the second negative electrode terminal is received, the distance between the battery modules to be stacked can be reduced, and the assembled battery can be miniaturized.

  Further, the positive protrusion on the battery module is provided on one side around a first imaginary straight line connecting the positive terminal of the first battery module and the negative terminal of the second battery module. The first battery module is provided on one side with a second virtual straight line connecting the negative terminal of the first battery module and the positive terminal of the second battery module as the center. For this reason, the shape of the two connection members required for connecting an arbitrary battery module and the battery modules adjacent to both sides thereof can be in a mirror image relationship with each other. Thereby, an assembled battery can be comprised using only a single-shaped connection member by connecting a battery module sequentially using the surface and back surface of a connection member alternately.

FIG. 1 is a front view showing an assembled battery in an embodiment of the present invention. FIG. 2 is an exploded perspective view showing the battery module in the embodiment of the present invention. FIG. 3A is a front view showing the battery module in the embodiment of the present invention, and FIG. 3B is a plan view showing the battery module in the embodiment of the present invention. FIG. 4 is a front view showing a modification of the layout of the positive electrode side protrusions and the negative electrode side protrusions of the battery module according to the embodiment of the present invention. FIG. 5 is a front view showing a modification of the layout of the positive output terminal, the negative output terminal, the positive protrusion, and the negative protrusion in the battery module according to the embodiment of the present invention. FIG. 6A is a front view showing the connection member, and FIG. 5B is a front view showing a modification of the connection member. FIG. 7A is an enlarged view of the VII portion of FIG. 1, and FIG. 7B is an enlarged view of the VII portion of FIG. 1 when the battery module is misassembled. FIG. 8 is a side view showing a modification of the positive output terminal and the negative output terminal of the battery module in the embodiment of the present invention. FIG. 9A is a perspective view showing a modification of the connection member, and FIG. 9B is a side view showing a modification of the housing in the battery module.

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

  FIG. 1 is a front view showing an assembled battery 1 in the present embodiment, FIG. 2 is an exploded perspective view showing a battery module 2 in the present embodiment, and FIGS. FIG. 4 is a front view showing a modified example of the layout of the protrusions 21 and 22 of the battery module in the present embodiment, and FIG. 5 is a battery module 2 in the present embodiment. It is a front view which shows the modification of the layout of the output terminals 131 and 132 and the protrusions 21 and 22. FIG.

  As shown in FIG. 1, the assembled battery 1 of the present embodiment includes a plurality of battery modules 2 and a connection member 30 that electrically connects the plurality of battery modules 2.

  Specifically, each battery module 2 has a positive output terminal 131 and a negative output terminal 132 that are led out from the same side surface in the same direction, and the plurality of battery modules 2 are adjacent battery modules. Two positive-side output terminals 131 and negative-side output terminals 132 are stacked in a staggered manner. That is, the plurality of battery modules 2 are stacked with their directions reversed alternately.

  And the connection member 30 has connected the positive electrode side output terminal 131 and the negative electrode side output terminal 132 of the adjacent battery module 2 one after another so that all the some battery modules 2 may be connected in series. In addition, in this example, although the assembled battery 1 is comprised using the four battery modules 2, the number of the battery modules 2 which comprise the assembled battery 1 is not specifically limited. In the following, the three connecting members 30 in FIG. 1 are also referred to as a connecting member 30A, a connecting member 30B, and a connecting member 30C in order from the left in the drawing, and the four battery modules 2 in FIG. Also referred to as battery module 2B, battery module 2C, and battery module 2D.

  As shown in FIG. 2, the battery module 2 includes a plurality of unit cells 101 stacked together, a spacer 305 interposed between the unit cells 101, and a case 360 that accommodates the unit cells 101 and the spacer 305. And.

  The unit cell 101 is a laminated battery such as a lithium ion secondary battery. Although not shown in particular, this unit cell 101 has a laminate formed by alternately laminating positive plates and negative plates via separators, and a laminate film that seals the laminate together with an electrolytic solution. The positive electrode tab connected to the positive electrode plate is led out from one end of the laminate film, and the negative electrode tab connected to the negative electrode plate is led out from the opposite end of the laminate film. The unit cell 101 may be constituted by a nickel metal hydride battery, a lead battery, or the like.

  In this embodiment, after stacking the unit cells 101 by alternately reversing the directions of the positive electrode tab and the negative electrode tab of the adjacent unit cells 101, the unit cells 101 are connected in series by directly joining the positive electrode tab and the negative electrode tab. Connected to. One end of each of the connected unit cells 101 is electrically connected to the output terminals 131 and 132 on the positive electrode side and the negative electrode side, respectively.

  As shown in FIG. 2, such a plurality of unit cells 101 are housed in a case 360 with a spacer 305 interposed between the adjacent unit cells 101 to maintain insulation.

  The case 360 includes a lower case 361 having a box shape and an upper case 362 having a lid shape, and the lower case 361 and the upper case 362 are formed of a thin aluminum plate. In the present embodiment, eight unit cells 101 are stacked and housed in the case 360, but the number of unit cells 101 to be stacked is not particularly limited.

  In the present embodiment, the positive output terminal 131 and the negative output terminal 132 have substantially the same bolt shape as shown in FIG. 3B, and sandwich a connecting member 30 described later. The nut 23 is screwed. The positive output terminal 131 and the negative output terminal 132 both protrude from the side surface 364 of the battery module 2 toward the left side in FIG. 3B, and as shown in FIG. 3A, the battery module 2 It arrange | positions so that it may be located on the centerline CL of the thickness direction.

  In the present embodiment, the bolt shape of the positive output terminal 131 and the negative output terminal 132 and the nut 23 are screwed together, but the present invention is not limited to this. For example, bolts may be provided around the output terminals 131 and 132 on the center line CL in the thickness direction of the battery module 2. In this case, the bolt and the nut 23 are screwed together with a connection member 30 described later.

  Further, in this embodiment, as shown in FIGS. 2 and 3A, the periphery of the positive output terminal 131 is covered with a housing 134 made of an insulator, and the positive protrusion 21 is formed on the housing 134. Is provided. Similarly, the periphery of the negative output terminal 132 is covered with a housing 135 made of an insulator, and the negative protrusion 22 is provided on the housing 135. The positive electrode side protrusion 21 and the negative electrode side protrusion 22 have substantially the same shape.

  As shown in FIG. 1, the positive-side protrusion 21 is provided on one side centered on a first virtual straight line VL1 that passes through the positive-side output terminal 131 and the negative-side output terminal 132 of the adjacent battery module 2. Yes. Moreover, the negative electrode side protrusion 22 is also provided on one side centering on the second virtual straight line VL2 passing through the negative electrode side output terminal 132 and the positive electrode side output terminal 131 of the adjacent battery module 2.

  That is, when the battery module 2B is seen as an example, as shown in FIG. 1, the positive electrode-side protrusion 21 of the battery module 2B is connected to the positive output terminal 131 of the battery module 2B and the battery module 2A adjacent to the battery module 2B. Alternatively, the first virtual straight line VL1 passing through the 2C negative electrode side output terminal 132 is provided on the upper side in the drawing. Similarly, the negative electrode side protrusion 22 of the battery module 2B passes through the negative electrode side output terminal 132 of the battery module 2B and the positive electrode side output terminal 131 of the battery module 2A or 2C adjacent to the battery module 2B. It is provided above the virtual straight line VL2 in the figure. Note that the directions of the first and second virtual straight lines VL <b> 1 and VL <b> 2 in the present embodiment substantially coincide with the stacking direction of the plurality of battery modules 2.

  The positive electrode side protrusion 21 and the negative electrode side protrusion 22 in the present embodiment are provided on a virtual straight line HL passing through the positive electrode side output terminal 131 and the negative electrode side output terminal 132 as shown in FIG. There is no particular limitation. For example, one of the positive electrode side protrusion 21 and the negative electrode side protrusion 22 may not be provided on the virtual straight line HL, and as shown in FIG. Both protrusions may not be provided on the virtual straight line HL.

  In the present embodiment, the virtual straight line HL passing through the positive electrode side output terminal 131 and the negative electrode side output terminal 132 coincides with the center line CL in the thickness direction of the battery module 2, but is not particularly limited thereto.

  For example, as shown in FIG. 5, the virtual straight line HL passing through the positive electrode side output terminal 131 and the negative electrode side output terminal 132 passes through the virtual center point CP of the side surface 364 of the battery module, and in the thickness direction of the battery module 2. It does not have to coincide with the center line CL. Also in this case, the positive electrode side protrusion 21 and the negative electrode side protrusion 22 are provided on the virtual straight line HL.

  Returning to FIG. 3B, in the present embodiment, the height h1 of the positive-side protrusion 21 from the side surface 364 of the battery module 2 is formed higher than the height m1 of the positive-side output terminal (h1> m1). . The height h2 of the negative electrode side protrusion 22 from the side surface 364 of the battery module 2 is formed to be higher than the height m2 of the negative electrode side output terminal (h2> m2).

  Next, the connection member 30 will be described.

  FIG. 6A is a front view showing the connection member 30 in this embodiment, and FIG. 6B is a front view showing a modification of the connection member in this embodiment.

  The connecting member 30 is composed of a flat plate member having conductivity. As shown in FIG. 6A, the connection member 30 is provided with a first through hole 35 and a second through hole 36.

  These two through holes 35 and 36 have substantially the same size, and are slightly larger than the cross-sectional shapes of the positive electrode side output terminal 131 and the negative electrode side output terminal 132 of the battery module 2 in plan view. It has a shape. Further, the distance between the center of the first through hole 35 and the center of the second through hole 36 is such that the center of one positive electrode side output terminal 131 in the two battery modules 2 adjacent to each other in the assembled battery 1 and the other negative electrode. It is equal to the distance between the centers of the side output terminals 132.

  Further, as shown in FIG. 6A, the connection member 30 is provided with a first notch 31 on the upper side surface in the figure corresponding to the first through hole 35. The shape of the first notch 31 is a shape corresponding to the cross-sectional shapes of the positive electrode side protrusion 21 and the negative electrode side protrusion 22 of the battery module 2. For this reason, when the assembled battery 1 is assembled, when the positive output terminal 131 of the battery module 2 is inserted into the first through hole 35, the positive protrusion 21 is fitted into the first notch 31, When the negative electrode side output terminal 132 is inserted into one through hole 35, the negative electrode side protrusion 22 is fitted into the first notch 31.

  On the other hand, as shown in FIG. 6A, a second notch 32 is provided on the lower side surface in the figure corresponding to the second through hole 36 of the connection member 30. The shape of the second notch 31 is also a shape corresponding to the cross-sectional shape of the positive electrode side protrusion 21 and the negative electrode side protrusion 22 of the battery module 2 in plan view. For this reason, when the assembled battery 1 is assembled, when the positive output terminal 131 of the battery module 2 is inserted into the second through hole 36, the positive protrusion 21 is fitted into the second notch 32, When the negative electrode side output terminal 132 is inserted into the second through hole 36, the negative electrode side protrusion 22 is fitted into the second notch 32.

  The shape of the connecting member is not particularly limited to the above shape. For example, a first fitting hole 311 and a second fitting hole 321 are formed in place of the first and second cutout portions 31 and 32 as in the connection member 30S shown in FIG. May be. In this case, when the assembled battery 1 is assembled, when the positive output terminal 131 of the battery module 2 is inserted into the first through hole 35 of the connection member 30S, the battery module 2 is inserted into the first fitting hole 311. When the negative electrode side protrusion 21 of the battery module 2 is fitted and the negative electrode side output terminal 132 of the battery module 2 is inserted into the first through hole 35 of the connecting member 30S, the battery module 2 is inserted into the first fitting hole 311. The negative electrode side protrusion 22 is fitted.

  Similarly, when the positive output terminal 131 of the battery module 2 is inserted into the second through hole 36 of the connection member 30S, the positive protrusion 21 of the battery module 2 is fitted into the second fitting hole 321. When the negative output terminal 132 of the battery module 2 is inserted into the second through hole 36 of the connection member 30S, the negative protrusion 22 of the battery module 2 is fitted into the second fitting hole 321. Match.

  Next, the operation of this embodiment will be described.

  FIG. 7A is an enlarged view of the VII portion of FIG. 1, and FIG. 7B is an enlarged view of the VII portion of FIG. 1 when the battery module is misassembled.

  As shown in FIG. 1, the assembled battery 1 according to this embodiment includes positive and negative output terminals 131 and 132 of a battery module 2 that are alternately reversed and stacked in series using a connection member 30. Consists of connecting.

  Hereinafter, a connection portion between the battery module 2B and the battery module 2C by the connection member 30B will be described in detail as a representative example.

  As shown in FIG. 7A, the battery module 2B and the connection member 30B are connected after the positive output terminal 131 of the battery module 2B is inserted into the first through hole 35 of the connection member 30B. In this state, the positive output terminal 131 and the nut 23 are screwed together.

  Similarly, the connection between the battery module 2C and the connection member 30B is performed by inserting the negative output terminal 132 of the battery module 2C into the second through hole 36 of the connection member 30B and then sandwiching the connection member 30B. This is performed by screwing the side output terminal 132 and the nut 23 together.

  At this time, as shown in FIG. 7A, the positive electrode side protrusion 21 of the battery module 2B enters the first cutout portion 31 of the connection member 30B, and the negative electrode side protrusion 22 of the battery module 2C corresponds to the connection member 30B. The second notch 32 is inserted. Thereby, when connecting battery module 2B and battery module 2C with connecting member 30B, it can be easily recognized that these battery modules 2B and 2C are correctly connected in series.

  On the other hand, if the orientation of the battery module 2C is wrongly arranged, as shown in FIG. 7B, the negative projection on the negative side of the battery module 2C that should be positioned on the lower side of the output terminal 132 in the drawing. 22 is not positioned, and the positive-side protrusion 21 of the battery module 2C is positioned above the output terminal 131 in the drawing. In this case, the connection member 30B is not provided with a notch or the like into which the positive electrode side protrusion 21 of the battery module 2C enters.

  For this reason, even if it is going to insert the positive electrode side output terminal 131 of the battery module 2C in the 2nd through-hole 36 of the connection member 30B, the upper side surface 301 in FIG. 7 (B) in the connection member 30B is the positive electrode side of the battery module 2C. Since it contacts the protrusion 21, the position of the second through hole 36 of the connecting member 30B cannot be aligned with the position of the positive output terminal 131 of the battery module 2C. Thereby, the battery module 2C and the connection member 30B cannot be connected, and the incorrect assembly of the battery module 2 when assembling the assembled battery 1 can be prevented.

  When the connection member 30 includes the first cutout portion 31 and the second cutout portion 32, the shape of the first cutout portion 31 is changed to the first protrusion 21 in the positive electrode side protrusion 21 of the battery module 2. It is preferable that the cross-sectional shape of the portion to be fitted with the notch 31 is similar to the cross-sectional shape, and that the first notch 31 is slightly larger than the fitting portion of the positive-side protrusion 21.

  Similarly, the shape of the second notch 32 is similar to the cross-sectional shape of the portion of the negative electrode-side protrusion 22 of the battery module 2 that fits with the second notch 32, and the second notch 32 It is preferable that the notch 32 is slightly larger than the fitting portion of the negative electrode side protrusion 22.

  At this time, there is no play when the first notch 31 receives the positive-side protrusion 21 and no play when the second notch 32 receives the negative-side protrusion 22. Incorrect assembly of the battery module 2 can be prevented more reliably.

  Similarly, when the connection member 30 has the first fitting hole 311 and the second fitting hole 321, the following is performed. That is, the shape of the first fitting hole 311 is similar to the cross-sectional shape of the positive electrode side protrusion 21 in the battery module 2, and the first fitting hole 311 is slightly larger than the positive electrode side protrusion 21. Is preferred.

  Similarly, the shape of the second fitting hole 321 is also similar to the cross-sectional shape of the negative electrode side protrusion 22 in the battery module 2, and the second fitting hole 321 is slightly larger than the negative electrode side protrusion 22. It is preferable.

  At this time, there is no play when the first fitting hole 311 is fitted to the positive-side protrusion 21, and there is no play when the second fitting hole 321 is fitted to the negative-side protrusion 22. Incorrect assembly of the battery module 2 at the time of assembling 1 can be prevented more reliably.

  In the present embodiment, as shown in FIG. 3B, the height h1 of the positive electrode-side protrusion 21 from the side surface 364 of the battery module 2 is formed higher than the height m1 of the positive electrode-side output terminal 131. (H1> m1). Similarly, the height h2 of the negative electrode side protrusion 22 from the side surface 364 of the battery module 2 is formed to be higher than the height m2 of the negative electrode side output terminal 132 (h2> m2). Accordingly, when the battery module 2 is misplaced, the positive electrode side protrusion 21 or the negative electrode side protrusion 22 does not enter the first notch portion 31 or the second notch portion 32 of the connection member 30. Nevertheless, it is possible to prevent the connection member 30 from being forcibly connected.

  In the present embodiment, the positive-side protrusion 21 of the battery module 2 received by the first notch 31 or the second notch 32 of the connection member 30 has the same direction as the positive-side output terminal 131 of the battery module 2. It protrudes in the (Z direction in FIG. 1). Similarly, the negative electrode side protrusion 22 of the battery module 2 is provided so as to protrude in the same direction as the negative electrode side output terminal 132 of the battery module 2 (Z direction in FIG. 1). For this reason, the distance between the battery modules 2 at the time of connection by the connection member 30 can be shortened, and the assembled battery 1 can be reduced in size.

  Furthermore, in the present embodiment, the positive electrode-side protrusion 21 of the battery module 2 has one positive center line VL1 centering on the first virtual straight line VL1 passing through the positive electrode-side output terminal 131 and the negative electrode-side output terminal 132 of the adjacent battery module 2. On the side. Moreover, the negative electrode side protrusion 22 is also provided on one side centering on the second virtual straight line VL2 passing through the negative electrode side output terminal 132 and the positive electrode side output terminal 131 of the adjacent battery module 2. Therefore, as shown in FIG. 1, the shape of the connecting member 30A for connecting the battery module 2B and the battery module 2A adjacent on the left side in the drawing, and the battery module 2B and the battery module 2C adjacent on the right side in the drawing are connected. The shapes of the connection members 30B can be mirror images of each other.

  That is, the shape of the connecting member 30B is a shape in which the connecting member 30A is turned upside down. Similarly, the shape of the connection member 30C is a shape obtained by reversing the shape of the connection member 30B.

  Thus, in this embodiment, the battery modules 2 can be connected one after another by alternately using the front surface and the back surface of the connection member 30 while preventing erroneous assembly of the battery modules 2. Thereby, the assembled battery 1 can be comprised, without requiring the connection member of shapes other than the connection member 30. FIG.

  On the other hand, the positive electrode side protrusion 21 is provided on one side centering on the first virtual straight line VL1 passing through the positive electrode side output terminal 131 and the negative electrode side output terminal 132 of the adjacent battery module 2, and the negative electrode side When the protrusion 22 is provided on the other side centered on the second virtual straight line VL2 that passes through the negative electrode side output terminal 132 and the positive electrode side output terminal 131 of the adjacent battery module 2, the above effect is obtained. I don't play.

  That is, the shape of the two connecting members necessary for connecting any three consecutive battery modules 2 can be mirror images of each other, but regardless of whether the battery modules 2 are correctly assembled. Since the connection member may be connected, it is not possible to prevent the battery module 2 from being assembled incorrectly.

  The positive output terminal 131 of the present embodiment corresponds to an example of the positive terminal and the first bolt in the present invention, and the negative output terminal 132 of the present embodiment corresponds to an example of the negative terminal and the second bolt in the present invention. The battery module 2B of the present embodiment corresponds to an example of the first battery module in the present invention, and the positive output terminal 131 in the battery module 2B of the present embodiment is the first positive terminal in the present invention. The negative output terminal 132 in the battery module 2B of the present embodiment corresponds to an example of the first negative terminal in the present invention, and the first virtual straight line VL1 in the present embodiment is the first in the present invention. The positive-side protrusion 21 in the battery module 2B of the present embodiment corresponds to an example of the first positive-side protrusion in the present invention. The negative electrode side protrusion 22 in the battery module 2B corresponds to an example of the first negative electrode side protrusion in the present invention, and the battery module 2C in the present embodiment corresponds to an example of the second battery module in the present invention. The positive output terminal 131 in the battery module 2C corresponds to an example of a second positive terminal in the present invention, and the negative output terminal 132 in the battery module 2C of the present embodiment corresponds to an example of a second negative terminal in the present invention. The second virtual straight line VL2 in the present embodiment corresponds to an example of the second virtual straight line in the present invention, and the positive-side protrusion 21 in the battery module 2C in the present embodiment is the second positive-side protrusion in the present invention. This corresponds to an example, and the negative electrode side protrusion 22 in the battery module 2C of this embodiment corresponds to an example of the second negative electrode side protrusion in the present invention. The first notch 31 in the connecting member 30B corresponds to an example of the first receiving part in the present invention, and the second notch 32 in the connecting member 30B in the present embodiment is the second receiving in the present invention. The virtual straight line HL in the battery module 2B of the present embodiment corresponds to an example of the third virtual straight line in the present invention, and the virtual straight line HL in the battery module 2C of the present embodiment is the fourth in the present invention. This corresponds to an example of the virtual straight line.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  For example, as shown in FIG. 8, the positive electrode side output terminal 131 </ b> B and the negative electrode side output terminal 132 </ b> B of the battery module 2 </ b> S have a female screw structure, and the bolts 24 screwed into the female screw structure are connected to the first of the connection member 30. After being inserted into the through hole 35 or the second through hole 36, the contact portion 30 may be fixed by screwing with the output terminals 131B and 132B.

  Even in this case, at the time of assembling the assembled battery 1, one of the positive electrode side protrusion 21 or the negative electrode side protrusion 22 of the battery module 2 </ b> S is fitted into the first notch 31 of the connection member 30 and adjacent to the battery module 2. If the other of the positive electrode side protrusion 21 or the negative electrode side protrusion 22 of the battery module 2S to be fitted is not fitted into the second notch 32 of the connection member 30, the battery modules 2S cannot be connected to each other. For this reason, incorrect assembly of the battery module 2S can be prevented.

  The positive projection 21 of the battery module 2S is provided so as to project in the same direction as the positive output terminal 131B, and the negative projection 22 is provided so as to project in the same direction as the negative output terminal 132B. For this reason, the distance between battery modules 2S can be shortened, and the assembled battery 1 can be reduced in size.

  Further, by connecting the battery modules 2S one after another using the front and back surfaces of the connection member 30 alternately while preventing the erroneous assembly of the battery module 2S, a connection member having a shape other than the connection member 30 is not required. The assembled battery 1 can be configured.

  9A and 9B, the first and second cutout portions 31 and 32 in the connection member 30 and the positive and negative projections 21 and 22 in the housings 134 and 135 are provided. And a battery module 2T having a connecting member 43 and housings 134B and 135B as described below.

  That is, as shown in FIG. 9A, the connection member 43 has a first protrusion protruding downward in the drawing at the position where the first notch 31 is formed in the connection member 30. 44 and a second projection 45 projecting upward in the figure. Similarly, a third protrusion 46 that protrudes downward in the figure and a fourth protrusion that protrudes upward in the figure at the position where the second notch 32 is formed in the connection member 30. 47 is provided on the connecting member 43.

  On the other hand, in the housing 134B, as shown in FIG. 9B, the positive electrode side receiving portion 41 having a recess or a notch shape into which the first and fourth protrusions 44 and 47 of the connecting member 43 can enter. And a negative electrode side receiving portion 42 having a recess or notch shape into which the second and third protrusions 45 and 46 of the connection member 43 can enter.

  In this case, when the assembled battery 1 is assembled, one of the first protrusion 44 or the fourth protrusion 47 of the connection member 43 enters the positive-side receiving part 41 of the battery module 2T, and the second of the connection member 43 If the protrusion 45 or the third protrusion 46 of the battery module 2T does not enter the negative electrode side receiving part 42 of the battery module 2T adjacent to the battery module 2T, the battery modules 2T cannot be connected to each other. For this reason, incorrect assembly of the battery module 2T can be prevented.

  In addition, the shape of the positive electrode side receiving portion 41 is similar to the cross-sectional shape of the portion where the first protruding portion 44 and the fourth protruding portion 47 of the connecting member 43 enter, and the shape of the positive electrode side receiving portion 41 is the first shape. It is preferable that the first protrusion 44 and the fourth protrusion 47 be slightly larger than the first protrusion 44 and the fourth protrusion 47.

  Similarly, the shape of the negative electrode side receiving portion 42 is similar to the cross-sectional shape of the portion where the second protruding portion 45 and the third protruding portion 46 of the connecting member 43 enter, and the shape of the negative electrode side receiving portion 42 is the same. It is preferable to make it slightly larger than the second protrusion 45 and the third protrusion 46.

  At this time, there is no play when the first to fourth projecting portions 44 to 47 enter the positive electrode side receiving portion 41 or the negative electrode side receiving portion 42, and it is possible to more reliably prevent the battery module 2 </ b> T from being incorrectly assembled when the assembled battery 1 is assembled. Can be prevented.

  The first and fourth protrusions 44 and 47 of the battery module 2T are provided so as to protrude in the same direction as or opposite to the positive output terminal 131, and the second and third protrusions 45 and 46 are on the negative electrode side. Projecting in the same direction as or opposite to the output terminal 132. For this reason, the distance between battery modules 2T can be shortened, and the assembled battery 1 can be reduced in size.

  Furthermore, by connecting the battery modules 2T one after another using the front and back surfaces of the connection member 43 alternately while preventing the erroneous assembly of the battery module 2T, a connection member having a shape other than the connection member 43 is not required. The assembled battery 1 can be configured.

  In this embodiment, as shown in FIGS. 9A and 9B, the height h1 of the first protrusion 44 and the fourth protrusion 47 is from the side surface 364 of the battery module 2T. The positive output terminal 131 is formed higher than the height m1 (h1> m1). Similarly, the height h2 of the second protrusion 45 and the third protrusion 46 is formed higher than the height m2 of the negative output terminal 132 from the side surface 364 of the battery module 2T (h2> m2). ). Thereby, when the battery module 2 is misplaced, the first to fourth protrusions 44 to 47 do not enter the positive electrode side receiving portion 41 or the negative electrode side receiving portion 42 of the battery module 2T. Therefore, it is possible to prevent the connection member 43 from being forcibly connected.

DESCRIPTION OF SYMBOLS 1 ... Assembly battery 2, 2A, 2B, 2C, 2D, 2S, 2T ... Battery module 131 ... Positive electrode side output terminal 132 ... Negative electrode side output terminal 21 ... Positive electrode side protrusion 41 ... -Positive electrode side receiving part 22 ... Negative electrode side protrusion 42 ... Negative electrode side receiving part 30, 30A, 30B, 30C, 43 ... Connection member 31 ... First notch part 32 ... Second Notch 311 first fitting hole 321 second fitting hole 44 first projection 45 second projection 46 third projection Part 47... Fourth protrusion

Claims (10)

A plurality of battery modules each having a positive electrode terminal and a negative electrode terminal derived from the same side surface are provided, and the plurality of battery modules are alternately reversed and stacked so that the different polarity terminals of the adjacent battery modules face each other. An assembled battery comprising:
The plurality of battery modules are:
A first battery module having a first positive terminal and a first negative terminal;
A second battery module having a second positive electrode terminal and a second negative electrode terminal and adjacent to the first battery module;
The first battery module includes:
A first positive-side protrusion provided on one side around a first imaginary straight line passing through the first positive terminal and the second negative terminal and protruding in the same direction as the first positive terminal; ,
A first negative-side protrusion provided on one side centered on a second imaginary straight line passing through the first negative terminal and the second positive terminal and protruding in the same direction as the first negative terminal; , And
The second battery module includes:
A second positive-side protrusion provided on the other side around the second virtual straight line and protruding in the same direction as the second positive-electrode terminal;
A second negative-side protrusion provided on the other side centered on the first imaginary straight line and protruding in the same direction as the second negative-electrode terminal;
The assembled battery further includes a connection member that connects the first positive terminal and the second negative terminal,
The connecting member is
A first receiving part for receiving the first positive electrode side protrusion;
And a second receiving portion for receiving the second negative electrode side protrusion. The assembled battery according to claim 1,
The first positive electrode side protrusion and the first negative electrode side protrusion are provided on a third imaginary straight line passing through the first positive electrode terminal and the first negative electrode terminal,
The second positive electrode side protrusion and the second negative electrode side protrusion are provided on a fourth imaginary straight line that passes through the second positive electrode terminal and the second negative electrode terminal. battery. The assembled battery according to claim 1 or 2,
The first receiving part is a through hole or a notch into which the first positive electrode side protrusion can enter,
The assembled battery, wherein the second receiving portion is a through hole or a notch into which the second negative electrode side protrusion can enter. The assembled battery according to claim 3,
The shape of the first receiving portion is similar to the cross-sectional shape of the portion where the first positive electrode side protrusion enters the first receiving portion,
The assembled battery is characterized in that the shape of the second receiving portion is similar to the cross-sectional shape of the portion where the second negative electrode-side protrusion enters the second receiving portion. The assembled battery according to any one of claims 1 to 4,
The first battery module further includes a first bolt for fixing the connection member and the first positive terminal,
The second battery module further includes a second bolt for fixing the connection member and the second negative electrode terminal,
An assembled battery characterized by satisfying at least one of the following formula (1) and the following formula (2).
H1> L1 (1)
H2> L2 (2)
However, in the above formulas (1) and (2), H1 is the height of the first positive electrode side protrusion, H2 is the height of the second negative electrode side protrusion, and L1 is the first height. L2 is the height of the second bolt. A plurality of battery modules each having a positive electrode terminal and a negative electrode terminal derived from the same side surface are provided, and the plurality of battery modules are alternately reversed and stacked so that the different polarity terminals of the adjacent battery modules face each other. An assembled battery comprising:
The plurality of battery modules are:
A first battery module having a first positive terminal and a first negative terminal;
A second battery module having a second positive electrode terminal and a second negative electrode terminal and adjacent to the first battery module;
The first battery module includes:
A first positive-side receiving portion provided on one side around a first imaginary straight line passing through the first positive terminal and the second negative terminal; the first negative terminal; and the second negative terminal A first negative electrode side receiving portion provided on one side with a second virtual straight line passing through the positive electrode terminal as a center,
The second battery module includes:
A second positive-side receiving portion provided on the other side with the second imaginary straight line as a center;
A second negative electrode side receiving portion provided on the other side around the first virtual straight line,
The assembled battery further includes a connection member that connects the first positive terminal and the second negative terminal,
The connecting member is
A first protrusion that protrudes in a direction opposite to the first positive terminal and enters the first positive-side receiving portion;
A second protrusion that protrudes in the same direction as the first positive terminal and is provided at a position corresponding to the first protrusion;
A third protrusion that protrudes in a direction opposite to the second negative electrode terminal and enters the second negative electrode-side receiving portion;
An assembled battery, comprising: a fourth protrusion that protrudes in the same direction as the second negative electrode terminal and is provided at a position corresponding to the third protrusion. The assembled battery according to claim 6,
The first positive electrode side receiving portion and the first negative electrode side receiving portion are provided on a third imaginary straight line passing through the first positive electrode terminal and the first negative electrode terminal,
The second positive electrode side receiving portion and the second negative electrode side receiving portion are provided on a fourth imaginary straight line that passes through the second positive electrode terminal and the second negative electrode terminal. Assembled battery. The assembled battery according to claim 6 or 7,
The first positive electrode side receiving portion is a recess or notch into which the first protrusion and the fourth protrusion can enter,
The assembled battery, wherein the second negative electrode side receiving portion is a recess or a notch into which the second protruding portion and the third protruding portion can enter. The assembled battery according to claim 8,
The shape of the first positive electrode side receiving portion is similar to the cross-sectional shape of the portion where the first protruding portion and the fourth protruding portion enter the first positive electrode side receiving portion,
The shape of the second negative electrode side receiving portion is similar to the cross-sectional shape of the portion where the second protruding portion and the third protruding portion enter the second negative electrode side receiving portion. Assembled battery. The assembled battery according to any one of claims 6 to 9,
The first battery module further includes a first bolt for fixing the connection member and the first positive terminal,
The second battery module further includes a second bolt for fixing the connection member and the second negative electrode terminal,
An assembled battery characterized by satisfying at least one of the following formula (1) and the following formula (2).
H1> L1 (1)
H2> L2 (2)
In the above formulas (1) and (2), H1 is the height of the first projection and the fourth projection, and H2 is the second projection and the third projection. L1 is the height of the first bolt, and L2 is the height of the second bolt.

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