JP2012129211A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack in which the workability of fixing work of bus bars can be enhanced by preventing occurrence of short circuit between battery modules during the fixing work of bus bars.SOLUTION: The battery pack has a battery module group consisting of an arrangement of a plurality of battery modules having output terminals, a plurality of conductive bus bars 40 fixed to the output terminals and interconnecting the battery modules electrically, and a planar bus bar holding plate 20 formed of an insulating material for holding the bus bar. The battery pack also has an insulating barrier protrusion 170 located between the bus bars on the bus bar holding surface 20a, on the side opposite from the battery module group, out of both surfaces of the bus bar holding plate, and protruding from the surface of the bus bar on the side opposite from the battery module group. The insulating barrier protrusion becomes a barrier for short circuit between the bus bars.

Description

  The present invention relates to an assembled battery.

A plurality of battery modules including a plurality of electrically connected single cells are arranged to form a battery module group, and the battery modules are electrically connected in series and / or in parallel to achieve high output and high power. Generally, a battery pack having a capacity is used. The battery modules are electrically connected by fixing a conductive bus bar to the output terminal.

  Such an assembled battery is provided with an insulating bus bar holding plate that holds a plurality of bus bars in order to improve the workability of fixing the bus bars to the output terminals. The bus bar holding plate is made of an insulating resin material or the like. When assembling the assembled battery, each bus bar is positioned with respect to each battery module by attaching the bus bar holding plate to the case housing the battery module group, and then the bus bar and the output terminal are fastened with bolts or the like. (See Patent Document 1).

  After all the bus bars are fastened to the output terminals, an insulating cover that covers the entire bus bar holding surface is attached to the bus bar holding surface opposite to the battery module group on both sides of the bus bar holding plate. This is to prevent the bus bar from coming into contact with a member outside the assembled battery or the like and causing a short circuit between the battery modules.

  However, when the bus bar is fastened, the bus bar that has been fastened to the output terminal remains exposed. For this reason, there exists a possibility that a fastening tool may contact several bus bars and a short circuit may occur between battery modules. Therefore, the operator must perform the bus bar fastening work while paying careful attention to the handling of the fastening tool, the working posture, and the like, and there is a problem that workability is poor.

  In order to solve this problem, a technique has been proposed in which a bus bar is insert-molded on a bus bar holding plate and the bus bar is covered with an insulating resin (see Patent Document 2).

  Patent Document 1 proposes a technique in which a fitting recess for fitting the bus bar is formed on the bus bar holding plate, and the bus bar is accommodated in the fitting recess.

JP 2000-223095 A JP-A-10-270006

  In the technique described in Patent Document 2, in order to reduce the weight and reduce the cost, when the thickness of the bus bar holding plate is approximately equal to or less than that of the bus bar, the bus bar is covered with an insulating resin by an insert mold. It is difficult. For this reason, generation | occurrence | production of the short circuit between battery modules at the time of the installation work of a bus bar cannot fully be prevented.

  In the technique described in Patent Literature 1, when the thickness of the bus bar holding plate is reduced to form the fitting recess, the thickness of the bus bar holding plate cannot be substantially equal to or less than that of the bus bar. In addition, when trying to form a fitting recess with a constant thickness of the bus bar holding plate, injection molding is difficult if the bus bar holding plate is thin, and the thin plate is deformed with a hot press or the like to hold the bus bar. A bus bar fitting recess must be formed in the plate, and a deep fitting recess cannot be formed. For this reason, the occurrence of a short circuit between the battery modules during the mounting operation of the bus bar cannot be sufficiently prevented only by forming the fitting recess.

  Accordingly, an object of the present invention is to provide an assembled battery that can prevent the occurrence of a short circuit between battery modules at the time of fixing the bus bar, improve the fixing workability of the bus bar, and thus improve the assembly workability of the assembled battery. There is.

The invention according to claim 1 for achieving the above object includes a battery module group formed by arranging a plurality of battery modules each having an output terminal;
A plurality of conductive bus bars fixed to the output terminal for electrically connecting the battery modules;
A plate-like bus bar holding plate formed of an insulating material for holding the bus bar;
Of the both surfaces of the bus bar holding plate, the bus bar holding surface opposite to the battery module group is located between the bus bars and provided to protrude from the surface of the bus bar opposite to the battery module group. An assembled battery having an insulating barrier protrusion.

  According to the assembled battery of the present invention, since the insulating barrier ribs that serve as a barrier against short-circuiting between bus bars are provided, a member (for example, a fastening tool or the like) that may short-circuit the bus bars is used as a bus bar. It is impossible to contact each other at the same time, and it is possible to prevent the battery modules from being short-circuited at the time of fixing the bus bar, and to improve the fixing workability of the bus bar, and hence the assembly workability of the assembled battery.

FIG. 1A is a perspective view showing an example of an assembled battery according to an embodiment of the present invention as seen from the front side, and FIG. 1B is a perspective view showing the assembled battery as seen from the back side. It is sectional drawing which follows the 2-2 line of FIG. 1 (A). It is a perspective view which shows the battery module group with which the bus bar holding plate was assembled | attached in the state which changed the bus bar into the covering state by the cover member arrange | positioned at the bus bar holding plate. It is a perspective view which shows an example of the battery module which is a unit unit at the time of assembling an assembled battery. FIG. 5 is a perspective view showing the battery module shown in FIG. 4 upside down and further disassembled. It is a perspective view which shows an example of a thin battery. It is a perspective view which shows a bus bar holding plate and a cover member. It is a perspective view which shows the state before fastening the bus bar hold | maintained at the bus bar holding plate to the output terminal of a battery module. It is sectional drawing which shows the principal part of FIG. It is a perspective view with which it uses for description of an effect | action of a barrier convex part. It is sectional drawing which shows the modification of a barrier convex part.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1A is a perspective view showing an example of an assembled battery 10 according to an embodiment of the present invention when viewed from the front side, and FIG. 1B is a perspective view showing the assembled battery 10 when viewed from the back side. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. FIG. 3 is a perspective view showing the battery module group 50a assembled with the bus bar holding plate 20 in a state where the bus bar 40 is changed to the covering state by the cover member 30 arranged on the bus bar holding plate 20, and FIG. 5 is a perspective view showing an example of a battery module 50 that is a unit unit when assembling 10, FIG. 5 is a perspective view showing the battery module 50 shown in FIG. 4 turned upside down and disassembled, and FIG. 6 is a thin battery. 1 is a perspective view showing an example of 100. FIG. 7 is a perspective view showing the bus bar holding plate 20 and the cover member 30, and FIG. 8 is a perspective view showing a state before the bus bar 40 held on the bus bar holding plate 20 is fastened to the output terminals 140 and 150 of the battery module 50. 9 is a cross-sectional view showing the main part of FIG. 8, and FIG. 10 is a perspective view for explaining the operation of the barrier convex part 170. In FIG. 2, the surface located on the left side is the front surface of each member, and the surface located on the right side is the back surface of each member.

  Referring to FIGS. 1 to 3 and 8, the assembled battery 10 of the present embodiment, in brief, includes a battery module group 50 a in which a plurality of battery modules 50 including output terminals 140 and 150 are arranged, and an output terminal. A plurality of conductive bus bars 40 fixed to 140 and 150 for electrically connecting the battery modules 50, a plate-like bus bar holding plate 20 formed of an insulating material for holding the bus bars 40, and bus bar holdings Insulating property provided on the bus bar holding surface 20a on the opposite side to the battery module group 50a on both sides of the plate 20 between the bus bars 40 and protruding from the surface of the bus bar 40 opposite to the battery module group. Barrier protrusion 170. This insulating barrier protrusion 170 serves as a barrier against a short circuit between the bus bars 40. Various forms for fixing the bus bar 40 to the output terminals 140 and 150 can be selected. In this embodiment, the bus bar 40 is fixed to the output terminals 140 and 150 by fastening with bolts. In the battery module group 50a, a plurality of battery modules 50 are arranged with a cooling air passage 51 through which cooling air flows. The bus bar holding plate 20 includes a through hole 21 formed corresponding to the position of the cooling air flow path 51. The through hole 21 has a long hole shape that matches the opening shape of the cooling air flow path 51. Details will be described below.

  The assembled battery 10 is an in-vehicle battery mounted on a vehicle such as an automobile or a train, and a plurality of battery modules 50 are stacked in a space 11 in the assembled battery case 11. The assembled battery case 11 has an upper plate 12 and a lower plate 13, an inlet duct 14 for introducing cooling air is connected to the front surface of the upper plate 12, and cooling air is led to the back surface of the upper plate 12. An outlet duct 15 is connected for the purpose. The inlet duct 14 is connected to a blower (not shown). The cooling air supplied from the blower is guided into the assembled battery case 11 through the inlet duct 14.

  By connecting any number of battery modules 50 in series and parallel, the assembled battery 10 can handle a desired current, voltage, and capacity. In the illustrated battery module group 50a, ten battery modules 50 are arranged. Ten battery modules 50 are arranged in two rows in the vertical direction and in five rows in the horizontal direction. The positive and negative output terminals 140 and 150 of the battery module 50 are all provided on the same surface (front surface). For example, the positive output terminal 140 of the battery module 50 in the upper left column is the positive output terminal of the assembled battery 10, and the negative output terminal 150 of the battery module 50 in the lower left column is the assembled battery 10. The output terminal on the negative electrode side. Reference numeral 16 in FIGS. 2 and 3 denotes a battery controller.

  The battery modules 50 are air-cooled, and the space between the battery modules 50 is used as a cooling air flow path 51 through which cooling air for cooling each of the battery modules 50 flows (see FIG. 2). The cooling air flows in the cooling air channel 51 from the front side where the positive and negative output terminals 140 and 150 of the battery module 50 are provided to the back side. By cooling each battery module 50 by flowing cooling air, the battery temperature is lowered and the characteristics such as charging efficiency are prevented from being lowered. The clearance between the battery modules 50, that is, the height of the cooling air flow path 51, is defined by a collar (not shown) disposed between the battery modules 50 at the time of stacking. The clearance between the battery modules 50 is determined in consideration of a layout when mounted on the vehicle, dimensions necessary for functioning as the cooling air flow path 51, and the like, but is about several millimeters.

  The space between the upper battery module 50 and the restraint plate 75 and the space between the lower battery module 50 and the lower plate 13 are also used as the cooling air flow paths 51a and 51b. The through holes 21 corresponding to the positions of the cooling air flow paths 51a and 51b do not exist, but the upper cooling air flow path 51a faces the gap between the bus bar holding plate 20 and the upper plate 12, and the lower cooling air flow path In 51b, a gap between the bus bar holding plate 20 and the lower plate 13 is exposed.

  With reference to FIGS. 4 and 5, the battery module 50 includes a cell unit 60 including a plurality of (eight in the illustrated example) thin batteries 100 housed in a module case 70. The battery module 50 is a type of assembled battery in that it includes a plurality of electrically connected single cells. In the present specification, the battery module 50 is a unit unit for assembling an “assembled battery”, and includes a plurality of single cells. A unit in which a battery is stored in a case is referred to as a “battery module”.

  The module case 70 includes a lower case 71 having a box shape in which an opening 71a is formed, and an upper case 72 forming a lid for closing the opening 71a. The edge 72a of the upper case 72 is wound around the edge 71c of the peripheral wall 71b of the lower case 71 by caulking (see the partially enlarged view of FIG. 4). The lower case 71 and the upper case 72 are formed from a relatively thin steel plate or aluminum plate, and are given a predetermined shape by pressing.

  The cell unit 60 includes a battery group 80 in which eight thin batteries 100 are stacked in the thickness direction and electrically connected in series, and a plate-like spacer for sandwiching a tab (electrode) of the thin battery 100. 110 and positive and negative output terminals 140 and 150. Insulating covers 91 and 92 are detachably attached to the front and back surfaces of the cell unit 60.

  The insulating covers 91 and 92 are used to cover the front side and the back side of the battery group 80. An insertion port 91a for inserting a voltage detection line connector (not shown) is formed at the center position of the insulating covers 91 and 92. The detection of voltage is performed for charge / discharge management of the battery module 50.

  The positive and negative output terminals 140 and 150 are led out from the module case 70 through notches 71d and 71e formed in a part of the peripheral wall 71b of the lower case 71. The insertion port 91a of the insulating covers 91 and 92 is also exposed to the outside of the module case 70 through a notch 71f formed in a part of the peripheral wall 71b. Screw holes 141 and 151 into which bolts 43 (see FIG. 7) described later are screwed are formed on the front surfaces of the output terminals 140 and 150.

In order to insert through bolts 74 (see FIG. 3) into the four corners of the module case 70, bolt holes 73 are formed in the four corners of the lower case 71 and the upper case 72, and two spacers 110 are provided. Bolt holes 111 are formed in the upper surface. Reference numeral 93 in FIG. 5 indicates a sleeve inserted into the bolt hole 111 of the spacer 110, and reference numeral 94 indicates a cushioning material provided between the cell unit 60 and the upper case 72.

  Referring to FIG. 6, a thin battery 100 is, for example, a flat lithium ion secondary battery, and a laminated power generation element (not shown) in which a positive electrode plate, a negative electrode plate, and a separator are sequentially laminated is a laminate film or the like. It is sealed with an exterior material 100a. In the battery 100, one end is electrically connected to the power generation element, and a positive electrode tab 100p and a negative electrode tab 100n having a plate shape are led out from the exterior material 100a. The tabs 100p and 100n extend on both sides of the thin battery 100 in the longitudinal direction. In the thin battery 100 including the stacked power generation element, it is necessary to apply pressure to the power generation element and hold it in order to maintain the battery performance by keeping the distance between the electrode plates uniform. For this reason, each thin battery 100 is accommodated in the module case 70 so that the power generation element is pressed down.

With reference to FIGS. 7 to 9, the bus bar holding plate 20 is a plate member having a substantially outer shape, and a mounting portion 22 for holding each of the plurality of bus bars 40 is formed. An opening 23 that penetrates from the front surface to the back surface is formed in the mounting portion 22. The output terminals 140 and 150 of the adjacent battery modules 50 face the opening 23. The bus bar holding plate 20 is also formed with an opening 23a that allows the positive and negative output terminals of the assembled battery 10 to face. Further, a holding claw 24 that protrudes from the front surface of the bus bar holding plate 20 and engages with a part of the outer peripheral edge of the bus bar 40 to hold the bus bar 40 is provided. The bus bar holding plate 20 is formed with a window portion 27 through which a voltage detection line connector (not shown) is inserted. The voltage detection line connector is inserted into the insertion port 91 a of the battery module 50 through the window portion 27. The lower end portion of the bus bar holding plate 20 is fitted into a receiving portion 13a formed on the upper end surface of the lower plate 13 (see FIG. 2). Thereby, the mounting position of the bus bar holding plate 20 is determined, and the positions of the plurality of bus bars 40 being held are determined collectively. The bus bar holding plate 20 is made of an insulating material, for example, an insulating resin material. The insulating resin material is not particularly limited, and examples thereof include PP (polypropylene).

  The bus bar 40 includes a pair of fastening portions 44 that are fastened (fixed) to the output terminals 140 and 150, and an engagement recess 45 that engages with the holding claw 24. The bus bar 40 shown in the figure has a flat rectangular shape. The fastening portions 44 are provided at both end positions in the longitudinal direction, and the bolt holes 41 are formed. The engaging recess 45 is provided at a central position in the longitudinal direction of the bus bar 40. By fitting the engaging recess 45 into the holding claw 24, the bus bar 40 is held at the mounting site 22. The opening 23 and the holding claw 24 are formed in a direction and a position that match the output terminals 140 and 150 that are electrically connected. Therefore, by fitting the engaging recess 45 into the holding claw 24, each bus bar 40 can be easily arranged at a position matching the output terminals 140 and 150 to be connected. In the illustrated example, eight bus bars 40 are arranged in the horizontal direction, and one bus bar 40 is arranged in the vertical direction. Even if the connection directions are different in this way, the direction in which the bus bar 40 is held by the holding claws 24 is regulated, so that erroneous connection can be fundamentally eliminated.

  The bus bar 40 is fixed to the output terminals 140 and 150 by fastening the bolts 43 inserted into the bolt holes 41 into the screw holes 141 and 151 of the output terminals 140 and 150. The holding claw 24 has not only a bus bar holding function but also a rotation preventing function during the operation of fastening the bolt 43. As a result of fixing the bus bar 40 to the output terminals 140 and 150, the bus bar holding plate 20 is fixed to the battery module group 50a.

  The bus bar 40 is exposed to the outside on the bus bar holding surface 20a opposite to the battery module group 50a on both sides of the bus bar holding plate 20. When conductive foreign matter comes into contact with the exposed bus bars 40 during the fastening operation of the bus bars 40, a short circuit between the battery modules 50 occurs.

  Therefore, as shown in FIGS. 8 to 10, in the assembled battery 10 of the present embodiment, the bus bars 40 are connected to the bus bar holding surface 20 a of the bus bar holding plate 20 that holds the bus bars 40. An insulating barrier protrusion 170 serving as a barrier against a short circuit is provided between the bus bars 40 so as to protrude from the surface of the bus bars 40. In this embodiment, since the bus bar 40 is fastened by the bolt 43, the barrier protrusion 170 protrudes beyond the head of the bolt 43 to the surface side (left side in FIG. 9). Since the barrier protrusion 170 exists as a barrier against a short circuit between the bus bars 40, a member (for example, the fastening tool 161) that may short-circuit the bus bars 40 cannot simultaneously contact the bus bars 40, and the bus bars 40 are fastened. Generation | occurrence | production of the short circuit between battery modules 50 at the time of work can be prevented beforehand.

  A through hole 21 is formed in the bus bar holding plate 20 corresponding to the position of the cooling air flow path 51. From this point, it is preferable that the barrier protrusion 170 has a duct shape that communicates with the through hole 21 and introduces cooling air into the cooling air flow channel 51. This is because the cooling air introduced from the outside can surely flow into the cooling air flow channel 51 by the barrier convex portion 170 having the duct shape, and the efficiency of cooling the battery module 50 is improved. Further, by providing the barrier convex portion 170 with the function of a wind guide plate, the size of the barrier convex portion 170 is larger than that in the case where the wind guide plate is separately provided within the limited installation space. Can be set. For this reason, the barrier convex portion 170 has a higher function as a barrier against a short circuit between the bus bars 40 and also has a higher function of guiding the cooling air.

The height at which the barrier protrusion 170 protrudes from the bus bar holding surface 20a includes the height from the bus bar holding surface 20a to the surface of the bus bar 40, the height of the head of the bolt 43, the fastening tool 161, and the like. Within the range that does not hinder the compactness of the battery pack, based on the height dimension necessary to prevent linear contact with 40 simultaneously and the height dimension necessary to provide the function of the air guide plate In FIG. In order to reduce the weight and reduce the cost, it is necessary to reduce the thickness of the bus bar holding plate 20. However, the thickness of the bus bar holding plate 20 is determined without being affected by the height dimension of the barrier protrusion 170. be able to. For this reason, the occurrence of a short circuit between the battery modules 50 can be sufficiently prevented by the barrier protrusion 170 having a sufficiently high height while reducing the weight and cost of the bus bar holding plate 20. Further, since the barrier protrusion 170 extends in a direction orthogonal to the surface of the bus bar holding plate 20, it is the same as the mold dividing direction for resin molding, and the mold configuration and resin molding procedure are complicated. Never do.

  Even after the assembled battery 10 is assembled, it is necessary to prevent the short circuit between the battery modules 50. Therefore, as shown in FIG. 8, the assembled battery 10 includes an insulating cover member 30 that is arranged on the bus bar holding surface 20 a for each bus bar 40 and that can change the corresponding bus bar 40 between a covered state and an exposed state. In addition.

  The cover member 30 includes a base portion 34 attached to the bus bar holding surface 20a of the bus bar holding plate 20 and a pair of covering portions 35 that are rotatably connected to the base portion 34 and individually cover the pair of fastening portions 44. And have. The covering portion 35 also covers the head of the bolt 43 to which the bus bar 40 is fastened. The pair of covering portions 35 rotate like wings around the base portion 34. The cover member 30 can change the corresponding bus bar 40 to the exposed state by opening the pair of covering portions 35, and can change the corresponding bus bar 40 to the covering state by closing the pair of covering portions 35. By fitting the convex part 32b provided in the covering part 35 into the concave part 25 of the bus bar holding surface 20a, the covering part 35 is fastened to the bus bar holding surface 20a.

  Next, the assembly procedure of the assembled battery 10 in this embodiment is demonstrated.

  A plurality of battery modules 50 arranged on the lower plate 13 are sandwiched and fixed between the lower plate 13 and the restraining plate 75 to form a battery module group 50a. When the battery modules 50 are stacked, a collar is disposed between the battery modules 50 to define the height of the cooling air flow path 51.

  The bus bar 40 is held on the bus bar holding surface 20 a of the bus bar holding plate 20. At this time, each bus bar 40 is disposed at a position matching the output terminals 140 and 150 to be connected by fitting the engaging recess 45 into the holding claw 24.

  The bus bar holding plate 20 is disposed on the front surface of the battery module group 50a. At this time, the lower end portion of the bus bar holding plate 20 is fitted into the receiving portion 13 a of the lower plate 13 to regulate the position of the bus bar holding plate 20 with respect to the lower plate 13. By positioning the bus bar holding plate 20, the plurality of bus bars 40 are positioned simultaneously. Further, the center of the bolt hole 41 of the bus bar 40 and the center of the screw holes 141 and 151 of the output terminals 140 and 150 coincide.

  Next, an operation of fastening the bus bar 40 to the output terminals 140 and 150 is performed. The bolt 43 is inserted into the bolt hole 41 of the bus bar 40. The bolt 43 is fastened to the screw holes 141 and 151 of the output terminals 140 and 150 through the opening 23 of the mounting part 22. Since the center of the bolt hole 41 of the bus bar 40 and the center of the screw holes 141 and 151 of the output terminals 140 and 150 are coincident, the fastening operation of the bolt 43 can be easily performed. As a result of fixing the bus bar 40 to the output terminals 140 and 150, the bus bar holding plate 20 is fixed to the battery module group 50a.

  When the bus bar 40 is fastened, the barrier protrusion 170 exists as a barrier against a short circuit between the bus bars 40. Therefore, the fastening tool 161 cannot contact the bus bars 40 at the same time. Generation | occurrence | production of mutual short circuit can be prevented beforehand. Therefore, the operator does not need to pay excessive attention to the handling of the fastening tool, the working posture, etc., and the workability at the time of fastening the bus bar 40 is improved. Thus, the occurrence of a short circuit between the battery modules 50 during the fastening operation of the bus bar 40 can be prevented, and the fastening workability of the bus bar 40 can be improved, and as a result, the assembly workability of the assembled battery 10 can be improved.

  When the fastening work of the last bus bar 40 is completed, the cover member 30 is attached, and all the bus bars 40 are changed from the exposed state to the covered state. Since all the bus bars 40 are in the covering state, after the assembled battery 10 is assembled, the occurrence of a short circuit between the battery modules 50 and the contact with the high voltage portion are prevented.

  During use of the assembled battery, the cooling air introduced from the outside is taken in from the duct-shaped barrier convex portion 170, flows through the cooling air flow passage 51 through the through hole 21, and cools the battery module 50. As described above, the barrier protrusion 170 allows the cooling air introduced from the outside to surely flow into the cooling air flow path 51 between the battery modules 50, thereby improving the cooling efficiency of the battery module 50. In addition, the cooling air introduced from the outside can be rectified without being disturbed by the cover member 30, and can flow through the cooling air flow path 51.

  The cover member 30 of this embodiment is disposed for each bus bar 40. Therefore, as a procedure for fastening the bus bar 40, when the corresponding bus bar 40 is fastened to the output terminals 140 and 150, the corresponding bus bar 40 is changed from the covered state to the exposed state, and other bus bars other than the corresponding bus bar 40 are used. When the terminal 40 is fastened to the output terminals 140 and 150, a procedure for changing the corresponding bus bar 40 to the covering state can be adopted.

  When such a procedure is adopted, first, the bus bar 40 is held on the bus bar holding surface 20a of the bus bar holding plate 20, and then the cover member 30 is attached to each bus bar 40 so that all the bus bars 40 are covered.

  When the fastening operation of the bus bar 40 is started, only one cover member 30 is opened, and only the bus bar 40 to be fastened is changed from the covered state to the exposed state. The other cover member 30 remains closed, and the other remaining bus bars 40 are kept in a covered state. In this state, the bolt 43 is inserted into the bolt hole 41 of the bus bar 40 changed to the exposed state, and the bolt 43 is fastened to the screw holes 141 and 151 of the output terminals 140 and 150.

  When fastening the bus bar 40 other than the bus bar 40 that has been fastened to the output terminals 140 and 150, first, the cover member 30 that has been opened is closed again, and the bus bar 40 that has been fastened is covered from the exposed state. Change to state.

Thereafter, only the next cover member 30 is opened, only the bus bar 40 to be fastened is changed from the covered state to the exposed state, and the fastening operation described above is performed. When the fastening operation is completed, the opened cover member 30 is closed again, and the bus bar 40 that has been performing the fastening operation is changed from the exposed state to the covered state.

  Since the fastening operation to the output terminals 140 and 150 is performed in a state where only one bus bar 40 to be fastened is changed to the exposed state, the bus bar 40 that has been fastened to the output terminals 140 and 150 is in a covered state. For this reason, generation | occurrence | production of the short circuit of battery modules 50 by the fastening tool 161 contacting the some bus bar 40 can be prevented.

  When the work procedure is wrong or when another cover member 30 is opened for some reason, the bus bars 40 other than the fastening target bus bar 40 are also changed to the exposed state. Even if such a situation occurs, as described above, the barrier convex portion 170 exists as a barrier against a short circuit between the bus bars 40, so the fastening tool 161 does not contact the bus bars 40 at the same time, and the battery module. Short circuit between 50 does not occur.

  Then, when the fastening operation of the last bus bar 40 is completed, the last bus bar 40 is changed from the exposed state to the covered state. Thereby, the fastening work about all the bus bars 40 is completed.

  As described above, according to the assembled battery 10 of the present embodiment, the bus bars 40 are provided on the bus bar holding surface 20a of the bus bar holding plate 20 so as to be positioned between the bus bars 40 and protrude from the surface of the bus bar 40. Since there is an insulating barrier convex portion 170 that serves as a barrier against short-circuiting, members that may short-circuit the bus bars 40 (for example, the fastening tool 161) cannot contact the bus bars 40 at the same time, The short circuit between the battery modules 50 during the fastening operation of the bus bar 40 can be prevented, and the fastening workability of the bus bar 40 can be improved, and as a result, the assembly workability of the assembled battery 10 can be improved.

  Further, the barrier protrusion 170 has a duct shape that communicates with the through-hole 21 and introduces cooling air into the cooling air flow channel 51, so that the cooling air introduced from the outside enters the cooling air flow channel 51 between the battery modules 50. It can flow reliably, and the cooling efficiency of the battery module 50 can be improved.

  Moreover, since it further has the insulating cover member 30 which is arrange | positioned for every bus bar 40 on the bus bar holding surface 20a and can change the corresponding bus bar 40 into a covering state and an exposed state, one bus bar 40 of fastening object Thus, the fastening operation of the bus bar 40 can be performed in a state in which only the exposed state is changed, and the occurrence of a short circuit between the battery modules 50 during the fastening operation of the bus bar 40 can be further prevented. Moreover, after the assembled battery 10 is assembled, the bus bar 40 can be covered with the cover member 30 to prevent the battery modules 50 from being short-circuited or from being brought into contact with the high voltage section.

(Modification of the barrier protrusion 170)
FIG. 11 is a cross-sectional view showing a modified example of the barrier protrusion 170.

  The barrier protrusion 170 is not limited to a duct shape, and has a plate shape that is provided between the bus bars 40 on the bus bar holding surface 20a so as to protrude from the surface of the bus bar 40. May be. This is because it can be a sufficient barrier against a short circuit between the bus bars 40. Of course, when the through-hole 21 is not formed in the bus bar holding plate 20, even when the through-hole 21 is formed, the shape of the barrier convex portion 170 may be a simple plate shape. This is because even if it has a plate shape, the function as a wind guide plate for guiding the cooling air to the through hole 21 can be sufficiently exhibited.

  The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the technical concept of the present invention.

  For example, the battery module group 50a in which the battery modules 50 are arranged in two stages and five rows is illustrated, but the arrangement form is not limited to this. Moreover, although the case where the cover member 30 and the bus bar 40 are adjacent to each other in the vertical direction is illustrated, the positional relationship between the adjacent members is not limited to this case. The present invention can also be applied to the assembled battery 10 in which the battery modules 50 are stacked such that the cover member 30 and the bus bar 40 are adjacent to each other in the horizontal direction.

10 battery packs,
20 Busbar holding plate,
20a Bus bar holding surface,
21 through hole,
22 wearing part,
23 opening,
24 holding nails,
30 cover member,
34 Base,
35 covering part,
40 Basba,
41 bolt holes,
43 volts,
44 fastening part,
45 engaging recess,
50 battery module,
50a battery module group,
51 Cooling air flow path,
100 thin battery,
140, 150 output terminals,
161 fastening tool,
170 Barrier protrusion.

Claims (3)

A battery module group in which a plurality of battery modules having output terminals are arranged;
A plurality of conductive bus bars fixed to the output terminal for electrically connecting the battery modules;
A plate-like bus bar holding plate formed of an insulating material for holding the bus bar;
Of the both surfaces of the bus bar holding plate, the bus bar holding surface opposite to the battery module group is located between the bus bars and provided to protrude from the surface of the bus bar opposite to the battery module group. An assembled battery comprising an insulating barrier protrusion. In the battery module group, a plurality of battery modules are arranged across a cooling air flow path through which cooling air flows.
The bus bar holding plate includes a through hole formed corresponding to the position of the cooling air flow path,
The assembled battery according to claim 1, wherein the barrier protrusion has a duct shape that communicates with the through-hole and introduces cooling air into the cooling air flow path.   The set according to claim 1, further comprising an insulating cover member disposed on the bus bar holding surface for each bus bar and capable of changing the corresponding bus bar between a covered state and an exposed state. battery.

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