JP5975133B2 - Battery module - Google Patents

Description

  The present invention relates to a battery module in which a plurality of battery cells are connected in series.

As an electronic module in which a plurality of battery cells are connected in series, for example, a battery module described in Patent Document 1 is known.
In the battery module described in Patent Document 1, battery cells are alternately arranged in the reverse direction. Positive and negative external terminals are respectively attached to the battery lids of the battery cells. The positive electrode external terminal and the negative electrode external terminal of adjacent battery cells are connected by a bus bar.

JP 2012-230775 A

  By the way, when the positive external terminal and the negative external terminal are connected by the bus bar, if the positive external terminal and the negative external terminal at the wrong position are connected, a short circuit occurs, resulting in a failure of the battery cell.

  The present invention has been made in view of such problems of the prior art, and an object thereof is to provide a battery module that can prevent a bus bar from being attached to an incorrect connection terminal.

  A battery module that solves the above-described problem is a battery module that includes a plurality of battery bodies including a battery holder and battery cells held by the battery holder, and the plurality of battery bodies are arranged side by side and adjacent to each other. The connection terminals of the body are connected by a bus bar, the plurality of battery bodies are connected in series, the battery holder includes a first battery holder and a second battery holder, and the battery cell includes the first battery holder. A first battery cell held by the battery holder and a second battery cell held by the second battery holder, the first battery cell comprising a first battery cell and a first battery cell. A first battery body, and a second battery body including the second battery holder and the second battery cell, and the insertion direction of the first battery cell with respect to the first battery holder and the second battery body. The second battery cell with respect to the battery holder The first battery holder and the second battery holder are alternately arranged with the first battery body and the second battery body so that the insertion direction is the same direction. The present invention has a positioning part to be provided, and has an index for inhibiting the connection of the bus bar at a portion located between the bus bars adjacent in the juxtaposition direction of the plurality of battery bodies.

  According to this, when connecting the connection terminals of the adjacent battery bodies with the bus bar, it is possible to avoid the connection of the connection terminals provided with the index between the adjacent connection terminals by the bus bar. As a result, since the connection terminals that are not provided with an index between them are connected by the bus bar, it is possible to prevent the bus bar from connecting the incorrect connection terminals and causing a short circuit.

About the said battery module, it is preferable that the said positioning part is the convex part and recessed part which were provided in the said 1st battery holder and the said 2nd battery holder.
With respect to the battery module, it is preferable that the index is visually recognizable.

According to this, the correct mounting position of the bus bar can be easily determined.
About the said battery module, it is preferable that the said parameter | index is a wall member provided between the bus bars adjacent to the parallel arrangement direction of the said battery cell.

  According to this, even if it is going to connect the connection terminals provided with the index between the bus bars, the connection of the bus bars is hindered by the wall member. For this reason, it is suppressed more suitably that a bus bar connects wrong connection terminals.

  In the battery module, the plurality of battery bodies are juxtaposed so that connection terminals of different polarities are adjacent to each other, the battery holder includes a first battery holder and a second battery holder, and the battery cell Has a first battery cell held by a first battery holder and a second battery cell held by the second battery holder, the first battery holder and the first battery cell And the second battery body including the second battery holder and the second battery cell are alternately arranged, and the first battery cell is connected to the connection terminal. The second battery cell has a first protrusion on a terminal surface provided with the first protrusion and the terminal surface on which the connection terminal is provided does not face the first protrusion and the battery cell in a juxtaposed direction. The first battery holder is provided with the first battery cell. A second protrusion that protrudes toward the side and protrudes to a position that contacts the second protrusion when the second battery cell is to be held; Is a second protrusion that protrudes toward the side where the second battery cell is provided and that protrudes to a position that contacts the first protrusion when the first battery cell is to be held. It is preferable to have a part.

  According to this, when it is going to hold | maintain a 2nd battery cell in a 1st battery holder, the 2nd convex part of a 2nd battery cell and the 1st projection part of a 1st battery holder contact | abut. For this reason, the 1st battery holder cannot hold the 2nd battery cell, but can hold only the 1st battery cell. Similarly, when trying to hold the first battery cell in the second battery holder, the first protrusion of the first battery cell and the second protrusion of the second battery holder come into contact with each other. For this reason, when the first battery cell and the second battery cell are assembled, the connection terminal of the first battery cell and the connection terminal of the second battery cell adjacent to the connection terminal of the first battery cell are The same polarity is suppressed. For this reason, occurrence of a short circuit is suppressed.

  A battery module for solving the above problems includes a first battery body including a first battery holder and a first battery cell held by the first battery holder, a second battery holder, and the second battery holder. A battery module in which connection terminals of different polarities from a second battery body composed of second battery cells held by a battery holder are arranged alternately so that the first battery cells are adjacent to each other. The terminal surface on which the connection terminal is provided has a first protrusion, and the second battery cell has a direction in which the first protrusion and the battery cell are arranged side by side on the terminal surface on which the connection terminal is provided. The first battery holder has a first protrusion at a position where it comes into contact with the second protrusion when the second battery cell is to be held. And the second battery holder attempts to hold the first battery cell And summarized in that a second protrusion in a position in which it contacts the first protrusion.

  According to this, when it is going to hold | maintain a 2nd battery cell in a 1st battery holder, the 2nd convex part of a 2nd battery cell and the 1st projection part of a 1st battery holder contact | abut. For this reason, the 1st battery holder cannot hold the 2nd battery cell, but can hold only the 1st battery cell. Similarly, when trying to hold the first battery cell in the second battery holder, the first protrusion of the first battery cell and the second protrusion of the second battery holder come into contact with each other. For this reason, when the first battery cell and the second battery cell are assembled, the connection terminal of the first battery cell and the connection terminal of the second battery cell adjacent to the connection terminal of the first battery cell are The same polarity is suppressed. If connection terminals of the same polarity are connected by a bus bar, it causes a short circuit. That is, when the connection terminals of the same polarity are adjacent to each other in the direction in which the battery cells are arranged, if the connection terminals adjacent to each other in the direction in which the battery cells are arranged are connected, the bus bar is attached at an incorrect position. By preventing the connection terminals having the same polarity from being adjacent to each other in the direction in which the battery cells are arranged side by side, it is possible to prevent the bus bar from being attached to the wrong connection terminal.

About the said battery module, it is preferable that a said 1st convex part and a said 2nd convex part are provided in the liquid injection port of a said 1st battery cell and a said 2nd battery cell.
According to this, the member provided in the liquid injection port can be used also as the first convex portion and the second convex portion. For this reason, it is not necessary to provide a 1st convex part and a 2nd convex part separately in a 1st battery cell and a 2nd battery cell.

  According to the present invention, it is possible to prevent the bus bar from being attached to an incorrect connection terminal.

The perspective view which shows the battery module of embodiment. The top view which shows the battery module of embodiment. The perspective view which shows the square battery of embodiment. The perspective view which shows the square battery and battery holder of embodiment. (A) And (b) is a perspective view which shows the 1st battery holder of embodiment. (A) And (b) is a perspective view which shows the 2nd battery holder of embodiment. The figure which shows the relationship between the wall member of embodiment, and a connection terminal. The top view which expands and shows a part of battery module. (A) is a perspective view which shows the 1st battery holder of another example, (b) is a top view which shows the battery module of another example.

Hereinafter, an embodiment of the battery module will be described.
As shown in FIG.1 and FIG.2, the battery module 10 has the 1st battery body 1 and the 2nd battery body 2 arranged in parallel by turns. The first battery body 1 includes a first battery holder 31 and a first prismatic battery 11 as a first battery cell held by the first battery holder 31. The second battery body 2 includes a second battery holder 51 and a second prismatic battery 12 as a second battery cell held by the second battery holder 51. The first prismatic battery 11 and the second prismatic battery 12 are the same prismatic battery, but are disposed in opposite directions. That is, when the first prismatic battery 11 and the second prismatic battery 12 are alternately arranged, the positive terminal 13 of the first prismatic battery 11 and the positive terminal 13 of the second prismatic battery 12 are Positioned in different directions, the negative electrode terminal 14 of the first prismatic battery 11 and the negative electrode terminal 14 of the second prismatic battery 12 are positioned in different directions. Thereby, the positive terminal 13 of the first prismatic battery 11 (first battery body 1) and the negative terminal 14 of the second prismatic battery 12 (second battery body 2) are connected to the square batteries 11, 12. Adjacent to each other in the parallel direction. Further, the negative electrode terminal 14 of the first prismatic battery 11 and the positive electrode terminal 13 of the second prismatic battery 12 are adjacent to each other in the direction in which the prismatic batteries 11 and 12 are juxtaposed. The positive electrode terminal 13 and the negative electrode terminal 14 of the adjacent square batteries 11 and 12 are connected by a plate-like bus bar B, whereby the square batteries 11 and 12 are connected in series.

  In the battery module 10, plate-like end plates 71 and 72 are provided at both ends of the prismatic batteries 11 and 12 in the juxtaposed direction. The square batteries 11 and 12 are sandwiched between end plates 71 and 72.

  As shown in FIG. 3, the rectangular batteries 11 and 12 have an electrode 19 housed inside a case 15. The case 15 includes a bottomed square box-shaped case main body 16 that houses the electrode 19, and a rectangular flat plate-shaped lid member 17 that closes an opening of the case main body 16. A positive electrode terminal 13 as a connection terminal is provided on the first end 17 a in the longitudinal direction of the lid member 17. A negative electrode terminal 14 as a connection terminal is provided on the second end 17 b in the longitudinal direction of the lid member 17. The positive electrode terminal 13 and the negative electrode terminal 14 protrude toward the outside of the case 15. In the present embodiment, the surface in the thickness direction of the lid member 17 (the surface from which the connection terminal protrudes) is the terminal surface. At the center in the longitudinal direction of the lid member 17, a breakable release valve 18 is provided. In the longitudinal direction of the lid member 17, a liquid injection part 21 for injecting an electrolyte into the case 15 is provided slightly closer to the positive electrode terminal 13 than the release valve 18. The liquid injection unit 21 includes a liquid injection port 23 having a liquid injection port 22 that allows communication between the inside of the case 15 and the outside of the case 15, and a sealing plug 24 that closes the liquid injection port 22 of the liquid injection port 23. have. The liquid injection part 21 protrudes from the lid member 17 toward the outside of the case 15 in the thickness direction of the lid member 17.

  As shown in FIGS. 5A and 5B, the first battery holder 31 has a first covering portion 33 having a rectangular flat plate shape. A rectangular flat plate-like second covering portion 34 and a third covering portion 35 extending in the thickness direction of the first covering portion 33 are provided at both longitudinal ends of the first covering portion 33. A region surrounded by the covering portions 33, 34, and 35 is a housing portion S <b> 1 in which the first rectangular battery 11 is housed. A first longitudinal end portion 34a of the second covering portion 34 (an end portion opposite to the end portion on which the first covering portion 33 is provided) and a first longitudinal end portion 35a of the third covering portion 35 in the longitudinal direction. A rectangular flat plate-like fourth extending between the first end portions 34b and 35b in the short direction of the respective covering portions 34 and 35 is provided on the end portion opposite to the end portion on which the first covering portion 33 is provided. The covering portion 36 is provided. The thickness direction of the fourth covering portion 36 coincides with the short direction of the covering portions 34 and 35, and the longitudinal direction thereof coincides with the opposing direction of the second covering portion 34 and the third covering portion 35. The direction perpendicular to the thickness direction and the longitudinal direction of the fourth covering portion 36 is the short direction of the fourth covering portion 36.

  In addition, a terminal that is U-shaped and opens in the thickness direction of the fourth covering portion 36 on one end surface in the short direction of the fourth covering portion 36 at both longitudinal ends of the fourth covering portion 36. The accommodating portions 38 and 42 are provided, and the terminal accommodating portions 38 and 42 are connected to the covering portions 34 and 35, respectively. In each terminal accommodating portion 38, 42, wall members 39, 43 project from the surface opposite to the surface joined to the fourth covering portion 36. The wall member 43 is provided with a notch 44. On the other hand, the wall member 39 is not provided with a notch.

  On one end surface of the fourth covering portion 36 in the short direction, a rectangular columnar positioning portion 40 is adjacent to the terminal accommodating portion 38 so that the axis of the positioning portion 40 extends in the short direction of the covering portions 34 and 35. Is provided. The positioning portion 40 extends from the fourth covering portion 36 toward the housing portion S1, and one end surface in the axial direction (end surface on the housing portion S1 side) forms a flat surface. Moreover, the positioning part 40 has the recessed part 40a in the other end surface of an axial direction. A rectangular flat plate-like first protrusion 41 is provided adjacent to the positioning portion 40 on one end surface of the fourth covering portion 36 in the short direction. The first protruding portion 41 protrudes toward the accommodating portion S1. Since the first prismatic battery 11 is accommodated in the accommodating portion S1, the first protrusion 41 protrudes toward the side where the first prismatic battery 11 is provided.

  On one end face of the fourth covering portion 36 in the short direction, a rectangular columnar positioning portion 45 is adjacent to the terminal accommodating portion 42 so that the axis of the positioning portion 45 extends in the short direction of the covering portions 34 and 35. Is provided. The positioning portion 45 extends from the fourth covering portion 36 toward the housing portion S1 and has a convex portion 45a on one end surface in the axial direction (end surface on the housing portion S1 side). Further, in the positioning portion 45, the other end surface in the axial direction is a flat surface.

  A rectangular flat plate-like projecting portion 37 is connected to the first end portions 34 a and 35 a in the longitudinal direction of the second covering portion 34 and the third covering portion 35 in the extending direction of the covering portions 34 and 35. Square columnar legs 32 are provided at second end portions 34 c and 35 c in the longitudinal direction of the second covering portion 34 and the third covering portion 35. The axis of the leg portion 32 extends in the short direction of the covering portions 34 and 35. The leg portion 32 is provided with a convex portion 32a on one end face in the axial direction (surface in the same direction as one end face in the axial direction of the positioning portions 40 and 45), and provided with a concave portion 32b on the other end face in the axial direction. It has been.

  As shown in FIGS. 6A and 6B, the second battery holder 51 has a rectangular flat plate-shaped first covering portion 53. At both ends in the longitudinal direction of the first covering portion 53, a rectangular flat plate-like second covering portion 54 and a third covering portion 55 extending in the thickness direction of the first covering portion 53 are provided. A region surrounded by the covering portions 53, 54, and 55 is a housing portion S <b> 2 in which the second prismatic battery 12 is housed. The first longitudinal end portion 54a of the second covering portion 54 (the end opposite to the end portion on which the first covering portion 53 is provided) and the first longitudinal end portion 55a of the third covering portion 55 in the longitudinal direction. A rectangular flat plate-like fourth extending between the first end portions 54b and 55b in the short direction of the respective covering portions 54 and 55 is provided on the end portion on the side opposite to the end portion where the first covering portion 53 is provided. The covering portion 56 is provided. The thickness direction of the fourth covering portion 56 coincides with the short direction of the covering portions 54 and 55, and the longitudinal direction thereof coincides with the opposing direction of the second covering portion 54 and the third covering portion 55. The direction perpendicular to the thickness direction and the longitudinal direction of the fourth covering portion 56 is the short direction of the fourth covering portion 56.

  Further, a terminal that is U-shaped and opens in the thickness direction of the fourth covering portion 56 on one end surface in the short direction of the fourth covering portion 56 at both longitudinal ends of the fourth covering portion 56. The accommodating portions 58 and 62 are provided, and the terminal accommodating portions 58 and 62 are connected to the covering portions 54 and 55, respectively. In each of the terminal accommodating portions 58 and 62, wall members 59 and 63 project from the surface opposite to the surface joined to the fourth covering portion 56. The wall member 59 is provided with a notch 60. On the other hand, the wall member 63 is not provided with a notch. The notches 44 and 60 are provided in the terminal accommodating portions 42 and 58 that accommodate connection terminals of the same polarity (in this embodiment, the negative electrode terminal 14).

  On one end surface of the fourth covering portion 56 in the short direction, a rectangular columnar positioning portion 61 is adjacent to the terminal accommodating portion 58 so that the axis of the positioning portion 61 extends in the short direction of the covering portions 54 and 55. Is provided. The positioning portion 61 extends from the fourth covering portion 56 to the housing portion S2 side, and has a convex portion 61a on one end surface in the axial direction (end surface on the housing portion S2 side). Moreover, as for the positioning part 61, the other end surface of the axial direction has comprised the flat surface.

  On one end face of the fourth covering portion 56 in the short direction, a rectangular columnar positioning portion 64 is adjacent to the terminal accommodating portion 62 so that the axis of the positioning portion 64 extends in the short direction of the covering portions 54 and 55. Is provided. The positioning portion 64 extends from the fourth covering portion 56 to the housing portion S2 side, and one end surface in the axial direction (end surface on the housing portion S2 side) forms a flat surface. Further, the positioning portion 64 is provided with a concave portion 64a on the other end surface in the axial direction. A rectangular flat plate-like second protrusion 65 is provided adjacent to the positioning portion 64 on one end surface of the fourth covering portion 56 in the short direction. The second projecting portion 65 protrudes toward the housing portion S2. Since the second prismatic battery 12 is accommodated in the accommodating portion S2, the second protrusion 65 projects to the side where the second prismatic battery 12 is provided.

  A rectangular flat plate-like projecting portion 57 is connected to the first end portions 54 a and 55 a in the longitudinal direction of the second covering portion 54 and the third covering portion 55 in the extending direction of the covering portions 54 and 55. Square columnar legs 52 are provided at the second end portions 54 c and 55 c in the longitudinal direction of the second covering portion 54 and the third covering portion 55. The axis of the leg portion 52 extends in the short direction of the covering portions 54 and 55. The leg portion 52 is provided with a convex portion 52a on one end face in the axial direction (surface in the same direction as one end face in the axial direction of the positioning portions 61 and 64), and a concave portion 52b is provided on the other end face in the axial direction. It has been.

  The first prismatic battery 11 is accommodated in the accommodating portion S <b> 1 of the first battery holder 31. Specifically, the first covering portion 33 covers one surface in the height direction of the first rectangular battery 11 (the surface opposite to the surface on which the positive electrode terminal 13 and the negative electrode terminal 14 are provided), and the second Each of the covering portion 34 and the third covering portion 35 covers the surface of the first rectangular battery 11 in the width direction. Further, the positive terminal 13 of the first prismatic battery 11 is accommodated in the terminal accommodating portion 38, and the negative terminal 14 is accommodated in the terminal accommodating portion 42. Thus, the first battery body 1 is constituted by the first battery holder 31 and the first prismatic battery 11 held by the first battery holder 31.

  Further, the second prismatic battery 12 is accommodated in the accommodating portion S <b> 2 of the second battery holder 51. Specifically, the first covering portion 53 covers one surface in the height direction of the second prismatic battery 12 (the surface opposite to the surface on which the positive electrode terminal 13 and the negative electrode terminal 14 are provided), and the second The covering portion 54 and the third covering portion 55 respectively cover the surface in the width direction of the second prismatic battery 12. Further, the positive electrode terminal 13 of the second prismatic battery 12 is accommodated in the terminal accommodating portion 62, and the negative electrode terminal 14 is accommodated in the terminal accommodating portion 58. Thus, the second battery body 2 is configured by the second battery holder 51 and the second prismatic battery 12 held by the second battery holder 51.

  As shown in FIG. 2, the first battery body 1 and the second battery body 2 arranged side by side are connected in series by a bus bar B. The bus bar B has notches B1 at both ends in the short direction of the rectangular flat plate member. The bus bar B is fixed to the prismatic batteries 11 and 12 by bolts 81 penetrating the bus bar B being screwed to the positive terminal 13 and the negative terminal 14. The bus bar B extends between the adjacent terminal accommodating portions 38, 42, 58, 62 via the notches 44, 60. Wall members 43 and 59 projecting from the terminal accommodating portions 42 and 58 enter the notches B1 of the bus bar B.

  The convex portion 45 a provided in the positioning portion 45 of the first battery holder 31 in the first battery body 1 is in the concave portion 64 a provided in the positioning portion 64 of the second battery holder 51 in the second battery body 2. Has been inserted. The convex portion 32 a provided on the first battery holder 31 in the first battery body 1 is inserted into the concave portion 52 b of the second battery holder 51 in the second battery body 2.

  Further, the convex portion 61 a provided in the positioning portion 61 of the second battery holder 51 in the second battery body 2 is a concave portion provided in the positioning portion 40 of the first battery holder 31 in the first battery body 1. 40a is inserted. Each convex portion 52 a provided in the second battery holder 51 in the second battery body 2 is inserted into each concave portion 32 b provided in the first battery holder 31 in the first battery body 1.

  Next, the wall members 39, 43, 59, 63 will be described with reference to FIG. FIG. 7 is an enlarged view of one side in the height direction of each of the square batteries 11 and 12 in the first battery body 1 and the second battery body 2 arranged side by side (the side on which the positive electrode terminal 13 and the negative electrode terminal 14 are provided). FIG.

  As shown in FIG. 7, with the square batteries 11 and 12 held by the first battery holder 31 and the second battery holder 51, the wall members 39 and 63 are the positive electrodes of the square batteries 11 and 12. It protrudes in the height direction of the rectangular batteries 11 and 12 from the terminal 13 and the negative electrode terminal 14.

Next, the 1st projection part 41 and the 2nd projection part 65 are demonstrated according to FIG. FIG. 8 is an enlarged plan view showing the first battery body 1 and the second battery body 2 arranged side by side.
As shown in FIG. 8, the length d1 (projection amount) in the longitudinal direction of the first protrusion 41 is from the edge in the thickness direction of the square battery 12 in the second square battery 12 to the liquid injection part 21. Longer than the shortest distance d2. The length d3 (projection amount) in the longitudinal direction of the second protrusion 65 is based on the shortest distance d4 from the edge in the thickness direction of the prismatic battery 11 to the liquid injection part 21 in the first prismatic battery 11. Too long.

  As shown in FIG. 2, the wall member 39 of the first battery holder 31 and the wall member 63 of the second battery holder 51 are provided between the bus bars B adjacent to each other in the direction in which the prismatic batteries 11 and 12 are juxtaposed. . The bus bar B connects the adjacent positive electrode terminal 13 and negative electrode terminal 14 via notches 44 and 60 provided in the wall members 43 and 59.

  The first protrusion 41 of the first battery holder 31 faces the liquid injection part 21 of the second prismatic battery 12 and the direction in which the prismatic batteries 11 and 12 are arranged side by side. The second protrusion 65 of the second battery holder 51 faces the liquid injection part 21 of the first prismatic battery 11 and the direction in which the prismatic batteries 11 and 12 are juxtaposed. That is, the liquid injection part 21 of the second prismatic battery 12 is positioned on the straight line L1 connecting the first protrusions 41, and the first rectangular shape is on the straight line L2 connecting the second protrusions 65. The liquid injection part 21 of the battery 11 is located. Therefore, the first protrusion 41 protrudes to a position where the first battery holder 31 comes into contact with the liquid injection part 21 of the second prismatic battery 12 when the first battery holder 31 is to hold the second prismatic battery 12. ing. The second protrusion 65 protrudes to a position where the second battery holder 51 contacts the liquid injection part 21 of the first prismatic battery 11 when the second battery holder 51 is to hold the first prismatic battery 11. ing. The sealing plug 24 provided in the liquid injection port 22 of the first prismatic battery 11 becomes the first convex portion, and the sealing plug 24 provided in the liquid injection port 22 of the second square battery 12 is the second convex portion. It becomes a convex part.

Next, the operation of the battery module 10 of the present embodiment will be described.
Between the bus bars B adjacent to each other in the direction in which the rectangular batteries 11 and 12 are juxtaposed, wall members 39 and 63 (wall members in which the notches 44 and 60 are not provided) are provided.

  The bus bar B connects the adjacent positive electrode terminal 13 and negative electrode terminal 14 via notches 44 and 60 provided in the terminal accommodating portions 42 and 62. That is, it can also be understood that the portion provided with the notches 44 and 60 functions as an index that allows the connection of the bus bar B.

  When the bus bar B is attached, the notches 44 and 60 serve as marks, and the correct attachment position of the bus bar B can be determined. In addition, even if the terminals arranged with the wall members 39 and 63 interposed therebetween are connected by the bus bar B, the bus bar B is prevented from being attached by the wall members 39 and 63, so the bus bar B is attached at an incorrect position. Is suppressed.

  In addition, as shown in FIG. 4, when trying to accommodate the second prismatic battery 12, that is, the prismatic battery whose connection terminals are arranged in the reverse direction, in the first battery holder 31, That is, the protrusion 41 is brought into contact with the first battery holder 31 to prevent the second prismatic battery 12 from being accommodated. Similarly, the housing of the first prismatic battery 11 in the second battery holder 51 is also suppressed. Here, “contact” means that the liquid injection part 21 and the first protrusion 41 are in contact with each other when the second prismatic battery 12 is not held by the first battery holder 31. Indicates.

  When the battery module 10 is assembled, the first battery holder 31 (first battery body 1) holding the first square battery 11 and the second battery holding the second square battery 12 are assembled. The battery holder 51 (second battery body 2) is overlapped. At this time, when the first battery holders 31 or the second battery holders 51 are continuously overlapped, the connection terminals having the same polarity are adjacent to each other in the direction in which the rectangular batteries 11 and 12 are juxtaposed. Cause. Details will be described below.

  Generally, when a battery module is configured by connecting battery cells in series, the battery cells are arranged side by side so that connection terminals of different polarities are adjacent to each other in the battery cell arrangement direction in order to reduce wiring resistance. At this time, if the connection terminals of the same polarity are accidentally arranged adjacent to each other in the direction in which the battery cells are arranged side by side, a short circuit occurs when the adjacent connection terminals are connected to each other, causing a failure of the battery cell. . For this reason, when battery cells are arranged in parallel, it is desired that connection terminals having different polarities be adjacent to each other in the direction in which the battery cells are arranged.

  In the present embodiment, the second battery 12 is prevented from being housed in the first battery holder 31, and the first battery 11 is restrained from being housed in the second battery holder 51. ing. For this reason, when the first battery body 1 and the second battery body 2 are alternately arranged in parallel, the connection terminals having the same polarity are adjacent to each other in the direction in which the rectangular batteries 11 and 12 are arranged in parallel, and the connection terminals having different polarities. Are suppressed from being next to each other.

  In the present embodiment, the first battery holders 31 or the second battery holders are positioned by the positioning portions 40, 45, 61, 64 provided in the first battery holder 31 and the second battery holder 51. It is suppressed that 51 overlaps continuously. Specifically, when the first battery holders 31 are overlapped with each other, a convex portion 45 a provided on one side in the longitudinal direction of the positioning portion 45 of the first battery holder 31 is formed on the first battery holder 31. The first battery holders 31 are prevented from being overlapped with each other in contact with the other flat surface in the longitudinal direction of the positioning portion 45. Further, when the second battery holders 51 are to be overlapped with each other, the convex part 61 a provided on one side in the longitudinal direction of the positioning part 61 of the second battery holder 51 is positioned on the positioning part 61 of the second battery holder 51. The second battery holders 51 are prevented from being overlapped with each other in contact with a flat surface provided on the other in the longitudinal direction.

Therefore, according to the above embodiment, the following effects can be obtained.
(1) Wall members 39 and 63 are provided between the bus bars B adjacent to each other in the direction in which the prismatic batteries 11 and 12 are juxtaposed. For this reason, when attaching the bus bar B, the bus bar B can be attached using the wall members 39 and 63 as an index that can be visually recognized, and the bus bar B is prevented from being attached at an incorrect position.

  (2) Since the wall members 39 and 63 are provided as indexes, the attachment of the bus bar B is suppressed by the wall members 39 and 63 even when the bus bar B is to be attached at an incorrect position.

  (3) The first battery holder 31 is provided with a first protrusion 41 that contacts the liquid injection part 21 of the second prismatic battery 12. The second battery holder 51 is provided with a second protrusion 65 that contacts the liquid injection part 21 of the first prismatic battery 11. For this reason, it is suppressed that the square batteries 11 and 12 are hold | maintained at the wrong battery holder. Therefore, connection terminals having the same polarity are not easily connected to each other, and a short circuit is suppressed.

  (4) The sealing plug 24 of the liquid injection part 21 is also used as the first convex part and the second convex part. For this reason, it is not necessary to provide the 1st convex part and the 2nd convex part in the 1st square battery 11 and the 2nd square battery 12 separately.

In addition, you may change embodiment as follows.
As shown in FIG. 9A, the first protrusion 91 may be provided on the positioning portion 40 of the first battery holder 31. The first protrusion 91 extends from the positioning unit 40 toward the positioning unit 45 (the first prismatic battery 11 extends along the surface in the height direction of the first prismatic battery 11 from the positioning portion 40. Extending in the width direction). The first protrusion 91 has an elongated plate shape. The first protrusion 91 is connected to an end surface 93 (an end surface on the side where the recess 40 a is not provided) forming a flat surface among the end surfaces in the axial direction of the positioning unit 40.

  As shown in FIG. 9B, the positioning portion 64 of the second battery holder 51 is also provided with a second protrusion 92, similar to the first battery holder 31. The second projecting portion 92 extends from the positioning portion 64 toward the positioning portion 61. The second protrusion 92 has an elongated plate shape.

  For example, as in the case of the first battery holder 31 and the second battery holder 51 described in the embodiment, when the first protrusion 41 and the second protrusion 65 are provided on the fourth covering portions 36 and 56, The protrusions 41 and 65 need to be extended from the fourth covering portions 36 and 56 toward the liquid injection portion 21 (convex portion). At this time, the protrusions 41 and 65 may cover the release valve 18, which may hinder the opening of the release valve 18.

  Like the battery holders 31 and 51 shown in FIG. 9, the protrusions 91 and 92 are arranged on the inlet side when the square batteries 11 and 12 are inserted into the housing parts S1 and S2 (second covering parts 34 and 54 and By providing on the side where the fourth covering portions 36 and 56 are not provided in the short direction of the third covering portions 35 and 55, the projecting portions 91 and 92 are directed toward the liquid injection portion 21 (square battery 11. , 12 in the thickness direction). Therefore, it can suppress that a projection part interferes with an open valve.

  Note that the protruding portions 91 and 92 may be provided in addition to the positioning portions 40 and 64. For example, when the positioning portions 40 and 64 are not provided, they may be provided in the terminal accommodating portions 38 and 58 or may be provided in the second covering portions 34 and 54.

  In the embodiment, the wall members 39, 63, that is, the indicators may not be provided. Even in this case, it is possible to prevent the bus bar B from being connected to the wrong connection terminal by preventing the protrusions 41 and 65 from having the same polarity of the connection terminals adjacent to each other in the direction in which the prismatic batteries 11 and 12 are juxtaposed. It is suppressed that it is attached.

  In the embodiment, the wall member is used as an index, but the present invention is not limited to this. For example, a portion having a different color, a mark, or the like may be provided as an index between the bus bars B adjacent to each other in the direction in which the prismatic batteries are juxtaposed to prevent the bus bar B from being attached at an incorrect position.

  In the embodiment, the first protrusion 41 and the second protrusion 65 of the first battery holder 31 and the second battery holder 51 may not be provided. In this case, it is preferable to prevent the wrong square battery from being held by a method other than the protrusion.

In the embodiment, the liquid injection part 21 may not be used as the first convex part and the second convex part, and a protrusion protruding from the lid member 17 may be provided separately.
In the embodiment, a cylindrical battery or a laminated battery may be used as the first battery cell and the second battery cell. In this case, the shape of the battery holder is changed according to the shape of the battery cell.

  In the embodiment, the combination of the convex portions and the concave portions provided in the positioning portions 40, 45, 61, 64 can suppress the overlap between the first battery holders 31 or the overlap between the second battery holders 51. You may change suitably.

  In the embodiment, changing the colors of the first battery holder 31 and the second battery holder 51 prevents the first battery holder 31 or the second battery holder 51 from being provided continuously. May be.

  In embodiment, while changing the shape of the positive electrode terminal 13 and the negative electrode terminal 14 of the square batteries 11 and 12, you may change the shape of the terminal accommodating parts 38, 42, 58, and 62 of the battery holders 31 and 51. . If the terminal storage portions 38 and 42 of the first battery holder 31 are to hold the second prismatic battery 12, the shape is determined so that the positive terminal 13 and the negative terminal 14 cannot be stored in the terminal storage portions 38 and 42. As a result, the second battery 12 is prevented from being held in the first battery holder 31. Similarly, holding the first rectangular battery 11 in the second battery holder 51 is suppressed.

  In the embodiment, a bus bar other than a plate shape may be used. In this case, it is preferable to provide the wall members 39 and 63 so that the bus bar comes into contact with the wall members 39 and 63 if the bus bar is to be attached at an incorrect position.

  In embodiment, although the 1st battery holder 31 and the 2nd battery holder 51 are made into the shape which coat | covers the five surfaces of the square batteries 11 and 12, it is not restricted to this. For example, only the surfaces of the rectangular batteries 11 and 12 in the thickness direction may be covered, or a plate-like member that sandwiches the rectangular batteries 11 and 12 from the thickness direction may be used.

  In the embodiment, the prismatic batteries 11 and 12 may be arranged side by side so that connection terminals having the same polarity are adjacent to each other. In this case, the positive electrode terminal 13 and the negative electrode terminal 14 (connection terminals having different polarities) of the adjacent rectangular batteries 11 and 12 are connected by the bus bar B. In this case, the battery holders 31 and 51 may be provided with a wall member for guiding the bus bar B. The wall member is provided between the bus bars, and extends from the positive electrode terminal 13 (or the negative electrode terminal 14) of the square battery 11 toward the negative electrode terminal 14 (or the positive electrode terminal 13) of the adjacent square battery 12. When the bus bar is attached, by providing the bus bar B along the wall member, the wall member serves as an index, and the bus bar B is prevented from being placed at an incorrect position.

  In the embodiment, an indicator that is not visually recognizable may be used. For example, undulations or the like that cannot be visually recognized may be provided in portions located between the bus bars B adjacent to each other in the direction in which the battery bodies 1 and 2 are juxtaposed in the battery holders 31 and 51. And if it can be determined that the undulation is provided when touched, the undulation will function as an index, and the correct mounting position of the bus bar B can be determined.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(A) The battery bodies are arranged side by side so that connection terminals of the same polarity are adjacent to each other, and connection terminals of different polarities in the adjacent battery bodies are connected by the bus bar. The battery module according to claim 3.

  (B) The indicator is a wall member that guides a bus bar that connects different connection terminals of the adjacent battery bodies, and the bus bar is provided along the wall member. The battery module described in 1.

  B: Bus bar, 1, 2 ... Battery body, 10 ... Battery module, 11, 12 ... Square battery, 13 ... Positive electrode terminal, 14 ... Negative electrode terminal, 21 ... Liquid injection part, 31, 51 ... Battery holder, 39, 63 ... wall member, 41, 91 ... 1st projection part, 65, 92 ... 2nd projection part.

Claims (2)

A battery module having a plurality of battery bodies composed of a battery holder and battery cells held by the battery holder,
The plurality of battery bodies are arranged side by side, the connection terminals of adjacent battery bodies are connected by a bus bar, and the plurality of battery bodies are connected in series,
The battery holder has a first battery holder and a second battery holder,
The battery cell has a first battery cell held by the first battery holder and a second battery cell held by the second battery holder,
The first battery body composed of the first battery holder and the first battery cell, and the second battery body composed of the second battery holder and the second battery cell are the first battery body. The first battery cell insertion direction with respect to the battery holder and the second battery cell insertion direction with respect to the second battery holder are alternately arranged so as to be in the same direction,
The first battery holder and the second battery holder have positioning portions for alternately arranging the first battery body and the second battery body, and the plurality of battery bodies A battery module having an index for inhibiting connection of bus bars in a portion located between bus bars adjacent in the juxtaposed direction.   2. The battery module according to claim 1, wherein the positioning part is a convex part and a concave part provided in the first battery holder and the second battery holder.