JP5475633B2 - Battery assembly - Google Patents

Description

  Embodiments described herein relate generally to an assembled battery device in which a plurality of battery cells are combined.

  In recent years, assembled battery devices have been widely used as power sources for electric devices, electric bicycles, hybrid electric vehicles, electric vehicles, and the like. This assembled battery device is configured by electrically connecting a plurality of battery cells according to required output and capacity, and further mechanically integrating them.

  In an assembled battery device, when a plurality of battery cells are electrically connected, a bus bar that connects terminals of the battery cells is used (see, for example, Patent Document 1). In this bus bar, there is a bus bar that functions as an output terminal (a positive output terminal or a negative output terminal) for an external device.

  When a plurality of the assembled battery devices are electrically connected, or when the assembled battery device is connected to another device such as a charger, the external bus bar is connected to the bus bar functioning as the output terminal. At this time, the external bus bar is overlaid on the bus bar functioning as an output terminal, and thereafter, the external bus bar is tightened and connected by a screw passing through both of them.

JP 2010-97722 A

  However, when a material such as a pure aluminum material that easily undergoes creep deformation is used as the bus bar material, the portion to which the tightening stress by the screw is applied undergoes creep deformation. As a result, the axial force of the connecting screw is reduced, the tightening stress is reduced and the screw is loosened, and the electrical connection is unstable. For this reason, the device reliability is lowered.

  This invention is made | formed in view of the above, The objective is to provide the assembled battery apparatus which can improve apparatus reliability.

  An assembled battery device according to an embodiment of the present invention includes a housing, a plurality of battery cells housed in the housing, a plate-like external output terminal electrically connected to the battery cell, and an external output terminal. The terminal block includes a mounting table having a groove portion on which a part of the external output terminal is mounted, and a conductive holding member provided on the mounting table so as to intersect the groove portion. A screw hole is formed on the bottom surface of the groove part, and a through hole through which a screw passes is formed in a part of the external output terminal placed in the groove part. A through hole through which a screw passes is formed, and the depth of the groove is shallower than the thickness of the external output terminal.

  An assembled battery device according to an embodiment of the present invention includes a housing, a plurality of battery cells housed in the housing, a plate-like external output terminal electrically connected to the battery cell, and an external output terminal. The external output terminal is formed with a through-hole, and the terminal block is formed so that a part of the external output terminal can be placed thereon, and can be inserted into the through-hole. And a screw hole is formed on the upper surface of the convex portion, and the height of the convex portion is lower than the thickness of the external output terminal.

  An assembled battery device according to an embodiment of the present invention includes a rectangular box-shaped casing and a plurality of battery cells accommodated in the casing, and a rectangular shape that discharges gas generated from the battery cells on the surface of the casing. Gas discharge holes are formed, and at the edge of the gas discharge hole, a rectangular frame-shaped water-proof rib rising from the edge is formed, and the outer peripheral surface of the water-proof rib is relative to the outer peripheral surface of the housing. It is inclined in the direction along the surface of the housing.

  An assembled battery device according to an embodiment of the present invention includes a rectangular box-shaped casing, a plurality of battery cells accommodated in the casing, and a plurality of battery cells that are provided on the surface of the casing and electrically connect the plurality of battery cells. Each of the plate-like conductive member and the electronic substrate provided on the plurality of conductive members and electrically connected to each of the plurality of conductive members, and each part connected to the electronic substrate in the adjacent conductive member, It is located on the straight line which inclines with respect to the outer peripheral surface of a housing on the surface of a housing.

  An assembled battery device according to an embodiment of the present invention includes a rectangular box-shaped casing, a plurality of battery cells accommodated in the casing, and a plurality of battery cells that are provided on the surface of the casing and electrically connect the plurality of battery cells. A plate-like conductive member, an electronic substrate provided on the plurality of conductive members, and each of the plurality of conductive members being electrically connected to each other; A plate-like short-circuit prevention member positioned between the connected parts, and the short-circuit prevention member is inclined in a direction along the surface of the housing with respect to the outer peripheral surface of the housing.

It is a disassembled perspective view which shows schematic structure of the assembled battery apparatus which concerns on the 1st Embodiment of this invention. It is an external appearance perspective view which shows schematic structure of the assembled battery apparatus shown in FIG. It is a top view which shows the bottom face of the lower case with which the assembled battery apparatus shown in FIG.1 and FIG.2 is provided. It is a top view which shows the back surface of the upper case with which the assembled battery apparatus shown in FIG.1 and FIG.2 is provided. It is an external appearance perspective view which shows the surface of the upper case with which the assembled battery apparatus shown in FIG.1 and FIG.2 is provided. It is sectional drawing for demonstrating the connection of the battery cell with which the assembled battery apparatus shown in FIG.1 and FIG.2 is provided, and a bus bar. It is a disassembled perspective view which shows schematic structure of the terminal block with which the assembled battery apparatus shown in FIG.1 and FIG.2 is provided. It is sectional drawing which shows schematic structure of the terminal block shown in FIG. It is an external appearance perspective view which shows the electronic substrate and top cover with which the assembled battery apparatus shown in FIG.1 and FIG.2 is provided. It is an external appearance perspective view which shows the modification 1 of the terminal block shown in FIG. It is a disassembled perspective view which shows the modification 2 of the terminal block shown in FIG. It is sectional drawing which shows schematic structure of the terminal block shown in FIG. It is a top view which shows the water shielding rib which exists in the surface of the upper case with which the assembled battery apparatus which concerns on the 2nd Embodiment of this invention is provided. It is a top view which shows the short circuit prevention member which exists in the surface of the upper case with which the assembled battery apparatus which concerns on the 3rd Embodiment of this invention is provided.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the assembled battery device 1 according to the first embodiment of the present invention includes a plurality of battery cells (unit cells) 2 and a spacer member 3 that separates the battery cells 2. A case 4 that is a housing that houses all the battery cells 2 together with the spacer member 3, a plurality of bus bars 5 that electrically connect the battery cells 2, and an electronic substrate 6 such as a printed wiring board are provided.

  Each battery cell 2 is a non-aqueous electrolyte secondary battery such as a lithium ion battery, and is housed in a flat rectangular parallelepiped outer container 11 made of aluminum or an aluminum alloy, together with a non-aqueous electrolyte in the outer container 11. And electrode bodies (not shown). The outer container 11 is composed of a container body 11a having an opening at the upper end (in FIG. 1) and a lid 11b having a rectangular plate shape that closes the opening of the container body 11a. The lid 11b is a container body. It is welded to 11a and formed fluid-tight.

  A positive electrode terminal 12a is provided at one end in the longitudinal direction of the lid 11b, and a negative electrode terminal 12b is provided at the other end. These positive electrode terminal 12a and negative electrode terminal 12b are connected to the positive electrode and the negative electrode of the electrode body in the battery cell 2, respectively, and protrude from the upper surface of the lid 11b. Further, one of the terminals, for example, the positive electrode terminal 12a is electrically connected to the lid body 11b and is at the same potential as the outer container 11. The negative electrode terminal 12b extends through the lid 11b, and a seal material made of an insulating material such as synthetic resin or glass, for example, a gasket (not shown) is provided between the negative electrode terminal 12b and the lid 11b. Is provided. This sealing material hermetically seals between the negative electrode terminal 12b and the exterior container 11 and is electrically insulated.

  For example, a rectangular safety valve 12c is provided at the center of the lid 11b. The safety valve 12c is formed by thinning a part of the lid 11b to about half the thickness, and a stamp is formed at the center of the upper surface of the thin part. When the gas is generated in the outer container 11 due to abnormality of the battery cell 2 and the internal pressure of the outer container 11 rises to a predetermined value or more, the safety valve 12c is opened and releases the gas in the outer container 11. Then, the internal pressure of the outer casing 11 is lowered to prevent problems such as rupture of the battery cell 2.

  The spacer member 3 is configured by assembling a plurality of rectangular sheets 3 a having insulating properties and heat insulating properties in a lattice shape in a standing state. As the material of the sheet 3a, for example, a resin such as polycarbonate is used. The spacer member 3 is positioned between the battery cells 2 described above, and suppresses the transfer of heat between the battery cells 2 while maintaining a gap between the battery cells 2 to be in an insulating state.

  The case 4 includes a lower case 4a, which is a box-shaped first case with one end opening whose upper end is open, and an upper case 4b, which is a box-shaped second case with one end opening, which closes the opening of the lower case 4a. And a top cover 4c that closes the opening of the upper case 4b. A partial cover 4d that covers a part of the top cover 4c is attached.

  The lower case 4a, the upper case 4b, the top cover 4c, and the partial cover 4d are insulative, and as a material thereof, for example, a resin such as polyphenylene ether (PPE) or polycarbonate is used. As shown in FIG. 1, for example, twenty-four battery cells 2 are provided, and eight of these battery cells 2 are arranged in three rows in the short direction of the lower case 4a. Yes.

  As shown in FIG. 3, on the bottom surface of the lower case 4a, a number corresponding to the number of the battery cells 2, for example, twenty-four engaging grooves 21 are formed. Each engagement groove 21 is formed in an elongated rectangular shape corresponding to a cross-sectional shape parallel to the lid body 11b in the outer casing 11 of the battery cell 2, and extends in the longitudinal direction of the lower case 4a. These engagement grooves 21 are arranged in three rows in the short direction of the lower case 4a. Further, ribs 22 are formed between the cell rows extending in the short direction of the lower case 4a, and these ribs 22 extend over the entire length of the lower case 4a in the short direction.

  As shown in FIG. 4, on the inner surface, that is, the back surface of the upper case 4 b on the lower case 4 a side, a number corresponding to the number of battery cells 2, here, twenty-four engagement grooves 23 are formed. Each engagement groove 23 is formed in an elongated rectangular shape corresponding to a cross-sectional shape parallel to the lid body 11b in the outer casing 11 of the battery cell 2, and extends in the longitudinal direction of the upper case 4b. These engagement grooves 23 are arranged in three rows in the short direction of the upper case 4b. Further, ribs 24 are formed between the cell rows extending in the short direction of the upper case 4b, and these ribs 24 extend over the entire length of the upper case 4b in the short direction.

  In the upper case 4b, two rectangular terminal exposure holes 25 and 26 corresponding to the positive terminal 12a and the negative terminal 12b of the battery cell 2 are formed on the bottom surface of each engagement groove 23, respectively. These terminal exposure holes 25 and 26 are located at both ends of the engagement groove 23. The positive electrode terminal 12 a and the negative electrode terminal 12 b protrude from the lid surface of each battery cell 2, and the positive electrode terminal 12 a and the negative electrode terminal 12 b in the battery cell 2 in the case 4 are exposed from the case surface via the terminal exposure holes 25 and 26. To do.

  A rectangular gas discharge hole 27 corresponding to the safety valve 12 c of the battery cell 2 is formed on the bottom surface of each engagement groove 23. The gas discharge hole 27 is located at the center between the two terminal exposure holes 25 and 26. When gas is released from the safety valve 12 c facing the gas discharge hole 27, the gas is discharged through the gas discharge hole 27. The gas discharged from the gas discharge hole 27 flows to the outside through a gap such as the upper case 4b and the top cover 4c.

  Each battery cell 2 is accommodated so as to be sandwiched together with the spacer member 3 from above and below by the lower case 4a and the upper case 4b. The lower case 4a and the upper case 4b are integrated as the case 4 by snap-fit coupling. When the battery cell 2 is accommodated, the lower end portion of the battery cell 2 is fitted into the engagement groove 21 of the lower case 4a, fixed to the lower case 4a with an adhesive or the like, and further the upper end portion of the battery cell 2 That is, the end on the lid 11b side is fitted into the engagement groove 23 of the upper case 4b.

  When the position of the battery cell 2 is determined by this fitting, the battery cells 2 adjacent in the short direction of the case 4 are such that the main surfaces of the outer container 11, that is, the surfaces having a large area of the outer container 11 are spacer members. 3 to face each other in parallel and spaced apart. Further, the battery cells 2 adjacent to each other in the longitudinal direction of the case 4 are also separated from each other via the spacer member 3. Finally, the twenty-four battery cells 2 are arranged so that the lids 11b are on the upper side, and further, eight pieces each are arranged in three rows in the short direction of the case 4 via the spacer members 3, respectively. Fixed.

  Next, as shown in FIG. 5, a plurality of mounting chambers 28 in which the bus bars 5 are mounted are formed on the surface of the upper case 4b on the electronic substrate 6 side, that is, the surface. Each bus bar 5 is mounted in these mounting chambers 28, and electrical connection of each battery cell 2 by a plurality of bus bars 5 is realized. Each mounting chamber 28 includes a plurality of regulating ribs 28a that regulate the movement of the bus bar 5 in the planar direction.

  In addition, on the surface of the upper case 4 b, water shielding ribs 29 that extend vertically from the edge of the gas discharge hole 27 are provided in all the gas discharge holes 27. These water shielding ribs 29 are each formed in a rectangular frame shape in accordance with the shape of the gas discharge hole 27. In the present embodiment, the outer peripheral surface of each water shielding rib 29 is parallel to the outer peripheral surface of the upper case 4b.

  Here, the assembled battery device 1 is mounted on other devices in various installation states, but one of the four side surfaces (surfaces other than the upper surface and the lower surface in FIG. 2) of the case 4 in FIG. 2 is turned down. May be installed. In this installed state, water generated by condensation may flow on the surface of the upper case 4b. Even when this water flows toward the gas discharge hole 27, the water is stopped by the water blocking ribs 29 existing at the edge of the gas discharge hole 27 and is prevented from flowing into the gas discharge hole 27. Thereby, the water flowing on the surface of the upper case 4b can be prevented from flowing into the lower case 4a from the gas discharge hole 27.

  In addition, a plurality of short-circuit prevention members 30 positioned between the ends of the bus bars 5 adjacent to each other at the same potential are provided on the surface of the upper case 4b. These short-circuit prevention members 30 can prevent a short circuit between adjacent bus bars 5 at the same potential even when the assembled battery device 1 is deformed so as to be recessed due to an external impact. As the short-circuit prevention member 30, a flat plate or bar is used. Both the plate-shaped and bar-shaped short-circuit prevention members 30 are erected on the surface of the upper case 4b. In addition, the bar that exists on the surface of the upper case 4 b other than the short-circuit prevention member 30 functions as a positioning bar for the bus bar 5.

  Each bus bar 5 functions as a conductive member that connects terminals of adjacent battery cells 2 so that the plurality of battery cells 2 are electrically in series, for example. The bus bar 5 is formed by bending and molding a metal plate such as aluminum. As the material of the bus bar 5, for example, a material that easily undergoes creep deformation such as pure aluminum may be used. This bus bar 5 is used, and in this embodiment, two battery cells 2 are connected in parallel to form one cell unit, and twelve cell units are connected in series.

  For example, three types of bus bars are used as the bus bar 5 described above. That is, in the four battery cells 2 arranged in two rows in the longitudinal direction of the case 4, there are eight bus bars (H-shaped bus bars) connecting the two positive terminals 12 a and the two negative terminals 12 b adjacent thereto. Four bus cells (I-shaped bus bar) connecting the two positive terminals 12a and the two negative terminals 12b on the same side in the four battery cells 2 arranged in a line in the short direction of 4, Two bus bars (U-shaped bus bars) that connect the positive terminals 12a or the negative terminals 12b in two battery cells 2 adjacent in the direction are used.

  The bus bar 5 is provided with at least one connection terminal 5a extending from the bus bar body and having a ring at the tip. However, although some bus bars 5 are provided with two connection terminals 5a, one functions as an electrical connection with the electronic substrate 6 and the other functions as a positioning. The bus bar 5 is connected to a printed wiring on the electronic board 6 by a connection terminal 5a, and is connected to a control circuit on the electronic board 6 through the printed wiring. The bus bar 5 is also connected to the thermistor through the printed wiring on the electronic board 6 in the same manner as described above. Therefore, the control circuit manages the state of each battery cell 2 by measuring the voltage of the battery cell 2 connected to the bus bar 5 by the measurement circuit or measuring the temperature of the battery cell 2 using the thermistor.

  The bus bar 5 is formed with a plurality of circular openings 5b, four in FIG. These openings 5b are provided to face the terminal exposure holes 25 and 26 of the upper case 4b in a state where the bus bar 5 is mounted in the mounting chamber 28. For this reason, a part of the positive electrode terminal 12a or a part of the negative electrode terminal 12b in the battery cell 2 in the case 4 is exposed from the opening 5b.

  In the bus bar 5, rectangular engagement holes 5c and 5d are provided on both sides of the opening 5b. These engagement holes 5c and 5d are arranged in the short direction of the upper case 4b with the opening 5b in between. Note that engagement members 12d corresponding to the two engagement holes 5c and 5d are provided around the positive electrode terminal 12a and the negative electrode terminal 12b of the battery cell 2. The engaging member 12d is constituted by a frame body 12d1 fitted to the positive terminal 12a or the negative terminal 12b, and a pair of engaging claws 12d2 and 12d3 extending in the vertical direction from the frame body 12d1.

  These engagement claws 12d2 and 12d3 are engaged with the two engagement holes 5c and 5d as shown in FIG. At this time, the positive electrode terminal 12a of the battery cell 2 contacts the back surface of the upper case 4b opposite to the opening 5b of the bus bar 5 through the terminal exposure hole 25 of the upper case 4b, and a part thereof is exposed from the opening 5b. The opening 5b is a step hole having a step, and an annular step surface 5b1 is formed on the inner peripheral surface of the opening 5b. Specifically, the opening 5b is a through hole, and a step is formed in the middle of the through direction, and the step is formed in an annular shape along the inner peripheral surface of the through hole. Thereby, the annular | circular shaped level | step difference surface 5b1 exists in the internal peripheral surface of the opening 5b.

  The positive electrode terminal 12a of the battery cell 2 is welded to the bus bar 5 by laser welding in the aforementioned contact state. The laser irradiation position is set to an end portion on the step surface 5b1 in the opening 5b (the position indicated by the arrow L in FIG. 6), and the end portion of the step surface 5b1 and the terminal surface of the positive electrode terminal 12a by laser irradiation. A part of them is melted and bonded, and the positive electrode terminal 12 a is welded to the bus bar 5. The connection of the negative electrode terminal 12b to the bus bar 5 is the same.

  Thus, the opening 5b that exposes only a part of the positive electrode terminal 12a or the negative electrode terminal 12b is used. Thereby, even if the assembly accuracy is somewhat lower than the shape of the opening in which the positive electrode terminal 12a or the negative electrode terminal 12b is fitted, the positive electrode terminal 12a or the negative electrode terminal 12b faces the opening 5b and contacts the back surface of the upper case 4b. Since laser welding is possible, the positive electrode terminal 12a or the negative electrode terminal 12b can be easily welded to the bus bar 5.

  As shown in FIG. 5, a part of all the engagement holes 5 c, 5 d is a notch formed by notching the bus bar 5. As a result, even if the assembly accuracy is somewhat lowered, the engagement member 12d on the battery cell 2 can be engaged with the engagement holes 5c and 5d of the bus bar 5.

  Here, among the bus bars 5 described above, a U-shaped bus bar that connects the positive terminals 12a in the two battery cells 2 adjacent in the short direction is a positive bus bar 5A, and the negative terminals 12b are connected to each other. When the bus bar connecting the two is the negative bus bar 5B, the positive bus bar 5A and the negative bus bar 5B function as external output terminals, which are connected to the terminal block 31.

  As shown in FIGS. 7 and 8, the terminal block 31 includes a mounting table 32 and a pressing member 33. As the material for the mounting table 32 and the pressing member 33, for example, conductive brass or the like is used. Since the structure of the terminal block 31 is common to both the positive electrode bus bar 5A and the negative electrode bus bar 5B, the terminal block 31 corresponding to the positive electrode bus bar 5A will be described, and the description of the terminal block 31 with respect to the negative electrode bus bar 5B will be omitted.

  The mounting table 32 is formed with a groove 32a that is shallower than the bus bar thickness of the positive electrode bus bar 5A (for example, about 90% of the bus bar thickness) and has a width enough to fit the positive electrode bus bar 5A. The groove portion 32 a is formed at substantially the center of the mounting table 32. At both ends of the upper surface of the mounting table 32, through holes 32b and 32c are provided with a groove 32a therebetween, and a screw hole 32d serving as a female screw is formed on the bottom surface of the groove 32a.

  The pressing member 33 is formed in a rectangular plate shape, and through holes 33a and 33b are provided at both ends of the pressing member 33, and a through hole 33c is also provided at the center between them. The pressing member 33 is placed on the mounting table 32 so as to intersect the groove 32a. In this state, the through hole 33a is positioned on the same straight line as the through hole 32b, and the through hole 33b is connected to the through hole 32c. The through hole 33c is positioned on the same straight line as the screw hole 32d.

  Here, a through hole H1 is formed at the end of the positive bus bar 5A, and a through hole H2 is also formed at the end of the external bus bar 5C. The external bus bar 5C is a conductive member having conductivity similar to the positive bus bar 5A. The external bus bar 5C is used when a plurality of assembled battery devices 1 are electrically connected, or when the assembled battery device 1 is connected to another device such as a charger.

  The positive bus bar 5 </ b> A and the external bus bar 5 </ b> C are electrically connected via the terminal block 31. First, the through hole H1 of the positive electrode bus bar 5A is aligned with the screw hole 32d in the groove portion 32a of the mounting table 32, and the end portion of the positive electrode bus bar 5A is fitted into the groove portion 32a of the mounting table 32. 33 are stacked. Thereafter, the two screws 34 and 35 are passed through the through holes 33a and 33b of the holding member 33 and the through holes 32b and 32c of the mounting table 32, respectively, and become the female screws formed on the surface of the upper case 4b. The terminal block 31 is fixed to the surface of the upper case 4b by turning it into a hole (not shown).

  Next, in the above-described state, the through hole H2 of the external bus bar 5C is aligned with the through hole 33c of the pressing member 33, and the end of the external bus bar 5C is placed on the pressing member 33. Next, the positive electrode screw 36 is passed through the through hole 33 c of the pressing member 33 and the through hole H 1 of the positive electrode bus bar 5 A, and is turned into the screw hole 32 d of the mounting table 32. Accordingly, the positive bus bar 5A and the external bus bar 5C are fastened and fixed to the mounting table 32 by the positive screw 36 through the pressing member 33.

  In this way, the positive bus bar 5A is fastened to the mounting table 32 by the positive screw 36 via the external bus bar 5C and the pressing member 33. However, since the depth of the groove 32a is shallower than the bus bar thickness of the positive bus bar 5A, the positive bus bar 5A is creeped. Even when it is deformed, the thickness by tightening does not change more than (the thickness of the positive bus bar 5A) − (the depth of the groove 32a), so that the decrease of the tightening stress and the loosening of the screw due to the decrease in the axial force are suppressed. It becomes possible to do. As a result, instability of electrical connection can be prevented and device reliability can be improved.

  Note that the thickness, width, material, and the like of the negative electrode bus bar 5B are the same as those of the positive electrode bus bar 5A, and the negative electrode bus bar 5B is also fixed together with other external bus bars 5C by the negative electrode screw 37 (see FIG. 5) as described above.

  As shown in FIG. 9, the top cover 4c has an opening 41 through which the positive electrode screw 36 passes and an opening 42 through which the negative electrode screw 37 passes. The top cover 4 c is provided with two wiring paths 43 and 44 for wiring connected to the electronic substrate 6, and a wiring chamber 45 connected to the wiring paths 43 and 44 is provided. Furthermore, a mounting groove 46 in which the external bus bar 5C is mounted is also provided. The mounting groove 46 and the wiring chamber 45 are separated by a rib 47. The top cover 4c is provided on the upper case 4b so as to cover the surface thereof, and is integrated by snap-fit coupling.

  Usually, wiring from the outside is passed through both or one of the two wiring paths 43, 44 and connected to the connector 6 a on the electronic board 6. Furthermore, the external bus bar 5C that fits the mounting groove 46 is mounted in the mounting groove 46 and fixed to the terminal block 31 by the positive screw 36 as described above. Similarly, with the negative electrode screw 37 on the opposite side, the external bus bar 5C for negative electrode is mounted in the mounting groove 46 and fixed to the terminal block 31. When this mounting is completed, the partial cover 4d is fitted on the top cover 4c. In addition, although the edge part on the opposite side to the terminal block 31 side in the external bus bar 5C will protrude from the case 4 of the assembled battery apparatus 1, the protrusion position can be changed with the bus bar shape of the external bus bar 5C.

  Here, each terminal block 31 is provided on the surface of the upper case 4b so that the positive electrode screw 36 and the negative electrode screw 37 are not positioned on a straight line parallel to the outer peripheral surface of the upper case 4b. That is, each terminal block 31 is provided such that the positive electrode screw 36 and the negative electrode screw 37 are located on a straight line on the surface of the upper case 4b and inclined with respect to the outer peripheral surface of the upper case 4b.

  As described above, the assembled battery device 1 is mounted on other devices in various installation states, and any one of the four side surfaces (surfaces other than the upper surface and the lower surface in FIG. 2) of the case 4 in FIG. May be implemented below. Furthermore, in the two assembled battery devices 1, the top covers 4 c may face each other, and the positive electrode screw 36 and the negative electrode screw 37 may be installed on the same side. This is because when the assembled battery device 1 is mounted, it may be advantageous to mount the assembled battery device 1 such that the lower case 4a side faces the outside of the mounting target device.

  Even in such an installation state, the positive electrode screw 36 and the negative electrode screw 37 of the assembled battery device 1 are not located on a straight line parallel to the outer peripheral surface. It will be in the state which 37 does not oppose. For this reason, even when the top covers 4c are damaged due to external impacts, the positive screws 36 or the negative screws 37 are prevented from contacting each other due to the non-opposition of the positive screws 36 and the negative screws 37. Therefore, a short circuit between the assembled battery devices 1 can be suppressed. When the positive electrode screws 36 and the negative electrode screws 37 face each other, there is a possibility that the positive electrode screws 36 or the negative electrode screws 37 come into contact with each other due to damage of the top covers 4c due to external impacts. Will increase.

  As shown in FIG. 9, the electronic substrate 6 is provided on each bus bar 5 in the upper case 4b, and is fixed to the surface of the upper case 4b by a fixing member 51 such as a screw. As the electronic board 6, for example, a printed board having printed wiring on both sides is used. On the upper surface of the electronic board 6, a connector 6a for external connection is provided. This connector 6a is a connector to which wiring such as a cable for transmission / reception with an external device is connected.

  Various through holes 52 and notches 53 are formed on the surface of the electronic substrate 6. The rod-like short-circuit prevention member 30 existing on the surface of the upper case 4 b protrudes through the through hole 52, and the plate-like short-circuit prevention member 30 protrudes through the notch 53. A fixing member 51 such as a screw also passes through a through hole (not shown) formed in the electronic substrate 6 and further passes through an annular hole of the connection terminal 5a of the bus bar 5 and is formed on the surface of the upper case 4b. The screw hole (not shown) to be a female screw is turned.

  Each short-circuit prevention member 30 is formed higher than the surface of the fixing member 51 in a state where the electronic substrate 6 is fixed, that is, when the fixing member 51 is a screw. Thereby, even if a tool falls at the time of an assembly operation etc., since it is suppressed that the bus bars 5 are electrically connected by the tool, a short circuit between adjacent bus bars 5 can be suppressed.

  As described above, according to the first embodiment of the present invention, the mounting table 32 constituting the terminal block 31 is formed with the groove 32a shallower than the thickness of the positive electrode bus bar 5A. The end portion of the positive bus bar 5A is placed on the groove portion 32a, and the pressing member 33 is overlaid thereon. Further, the external bus bar 5C is placed on the pressing member 33, and the positive bus bar 5A is connected to the outer side by the positive screw 36. The bus bar 5 </ b> C is fixed to the mounting table 32 via a pressing member 33. In such a fixed state, even if the positive electrode bus bar 5A undergoes creep deformation, the thickness due to tightening does not change more than (the thickness of the positive electrode bus bar 5A) − (the depth of the groove 32a). It is possible to suppress a decrease in tightening stress and screw loosening. As a result, instability of electrical connection can be prevented and device reliability can be improved.

  Next, Modification 1 and Modification 2 of the above-described terminal block 31 will be described with reference to FIGS. 10, 11, and 12.

  As shown in FIG. 10, in the first modification, the mounting table 32 includes a first member 61, a second member 62, and a third member 63. All of the first member 61, the second member 62, and the third member are plate materials, and the second member 62 and the third member 63 are exactly the same, and the difference between them and the first member 61 is thick. Is different. Therefore, there are two types of parts.

  The thickness of the first member 61 is thicker than the other second members 62 and third members 63. The thickness of the second member 62 and the third member 63 is thinner than the bus bar thickness of the positive electrode bus bar 5A (for example, about 90% of the bus bar thickness). The second member 62 and the third member 63 are integrated by being joined to both ends of the first member 61 by a bonding material such as an adhesive. As a result, a groove 32 a is formed between the second member 62 and the third member 63.

  Here, in the case where the mounting table 32 is manufactured by forming the groove 32a in a rectangular parallelepiped member, the groove processing time becomes long, so the member cost is likely to increase. On the other hand, by using the first member 61, the second member 62, and the third member 63, it becomes easier to manufacture the mounting table 32 having the groove portion 32a than in the case of performing groove processing, and therefore, an increase in cost can be avoided. it can.

  As shown in FIGS. 11 and 12, in Modification 2, the upper surface of the mounting table 32 is lower than the bus bar thickness of the positive bus bar 5A (for example, about 90% of the bus bar thickness), and the through hole H1 of the positive bus bar 5A A convex portion 64 having a warp equal to or less than that is formed. The convex portion 64 can be inserted into the through hole H1 of the positive electrode bus bar 5A, and a screw hole 64a serving as a female screw is formed on the upper surface of the convex portion 64.

  The positive electrode bus bar 5 </ b> A is placed on the mounting table 32 so that the through hole H <b> 1 is fitted to the convex portion 64 of the mounting table 32. The external bus bar 5C is placed thereon, the through hole H2 of the external bus bar 5C is aligned with the screw hole 64a of the convex part 64, the positive screw 36 is passed through the through hole H2 of the external bus bar 5C, and the screw hole of the convex part 64 64a. Thus, the positive bus bar 5A and the external bus bar 5C are fastened and fixed to the mounting table 32 by the positive screw 36. The mounting table 32 may be fixed to the upper surface of the upper case 4b by an adhesive or the like, or may be fixed by a screw.

  As described above, the positive bus bar 5A is fastened to the mounting table 32 by the positive screw 36 via the external bus bar 5C. However, since the height of the convex portion 64 is lower than the bus bar thickness of the positive bus bar 5A, the positive bus bar 5A is creep-deformed. However, since the thickness by tightening does not change more than (the thickness of the positive electrode bus bar 5A) − (the height of the convex portion 64), it is possible to suppress a decrease in tightening stress and a loosening of the screw accompanying a decrease in axial force. Is possible. As a result, instability of electrical connection can be prevented and device reliability can be improved. In addition, since the convex portion 64 of the terminal block 31 is within the width of the bus bar 5, the mounting table 32 can be made smaller than the terminal block 31 having the pressing member 33 described above. And weight reduction can be realized.

  Even when the mounting table 32 of the above-described modification 2 is manufactured, the mounting table 32 may be configured by two members as in the above-described modification 1. That is, the terminal block 31 according to the second modification may be formed by joining a plate-like member serving as a base and a disk-like member serving as the convex portion 64 with an adhesive or the like.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIG.

  The second embodiment of the present invention is basically the same as the first embodiment. In the second embodiment, differences from the first embodiment will be described, the same parts as those described in the first embodiment will be denoted by the same reference numerals, and the description thereof will also be omitted.

  As shown in FIG. 13, in the second embodiment of the present invention, the water shielding rib 29 is formed to be inclined by a predetermined angle with respect to the outer peripheral surface M1 of the upper case 4b. That is, the long side and the short side of the rectangular frame of the water blocking rib 29 are inclined with respect to the outer peripheral surface M1 of the upper case 4b, and the outer peripheral surface 29a of the water blocking rib 29 is relative to the outer peripheral surface M1 of the upper case 4b. It is inclined in a direction along the surface of the upper case 4b. Accordingly, the four wall surfaces constituting the outer peripheral surface 29a of the rectangular frame-shaped water shielding rib 29 are neither parallel nor perpendicular to the four wall surfaces constituting the outer peripheral surface M1 of the upper case 4b.

  Here, the assembled battery device 1 is mounted on other devices in various installation states, but one of the four side surfaces (surfaces other than the upper surface and the lower surface in FIG. 2) of the case 4 in FIG. Have been implemented. In this installed state, water generated by condensation may flow on the surface of the upper case 4b (see the dotted line in FIG. 13). Even when this water flows toward the gas discharge hole 27, the water flows along the outer peripheral surface 29 a of the water blocking rib 29 existing at the edge of the gas discharge hole 27. Thereby, it is possible to prevent water flowing on the surface of the upper case 4 b from flowing into the gas discharge hole 27. Furthermore, since the outer peripheral surface 29a of the water shielding rib 29 is inclined with respect to the outer peripheral surface M1 of the upper case 4b, the water that has reached the water shielding rib 29 remains on the outer peripheral surface 29a of the water shielding rib 29. Therefore, it is possible to prevent water from collecting on the drainage rib 29 and flowing from the gas discharge hole 27.

  As described above, according to the second embodiment of the present invention, the same effect as that of the first embodiment can be obtained. In addition, a rectangular frame-shaped water shield rib 29 rising from the edge of the gas discharge hole 27 is erected, and the water shield rib 29 has an outer peripheral surface 29a of the outer peripheral surface M1 of the upper case 4b. In contrast, it is formed so as to be inclined in a direction along the surface of the upper case 4b. As a result, the water generated by the condensation does not reach the water shielding rib 29 and stay on the outer peripheral surface 29a, so that the water accumulates on the water shielding rib 29 and flows from the gas discharge hole 27. It becomes possible to prevent reliably. Therefore, it is possible to prevent each battery cell 2 from being damaged by water flowing in from the gas discharge hole 27, and as a result, it is possible to improve device reliability.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIG.

  The third embodiment of the present invention is basically the same as the first embodiment. In the third embodiment, differences from the first embodiment will be described, and the same parts as those described in the first embodiment will be denoted by the same reference numerals, and the description thereof will also be omitted.

  As shown in FIG. 14, in the third embodiment of the present invention, each tip portion (connection position with the electronic substrate 6) that is a ring of the connection terminal 5 a of the adjacent bus bar 5 is the outer peripheral surface of the upper case 4 b. It is shifted by a predetermined amount a so as not to be positioned on a straight line perpendicular to M1, and is provided so as to be positioned on a straight line on the surface of the upper case 4b and inclined with respect to the outer peripheral surface M1 of the upper case 4b. Yes. Therefore, each front-end | tip part of the connection terminal 5a of the adjacent bus-bar 5 does not exist on the straight line parallel to the outer peripheral surface M1 of the upper case 4b, or a perpendicular | vertical straight line.

  Further, a plate-shaped short-circuit prevention member 30 is formed to be inclined by a predetermined angle with respect to the outer peripheral surface M1 of the upper case 4b. That is, the surface 30a which is the wall surface of the plate-shaped short-circuit prevention member 30 is inclined in a plane parallel to the surface of the upper case 4b with respect to the outer peripheral surface M1 of the upper case 4b. Therefore, the front surface 30a and the back surface 30b of the plate-shaped short-circuit prevention member 30 are neither parallel nor perpendicular to the outer peripheral surface M1 of the upper case 4b.

  Here, as in the second embodiment described above, water generated by condensation may flow on the surface of the upper case 4b. Even when this water flows downward in FIG. 14 (see the dotted line in FIG. 14), each tip of the connection terminal 5a of the adjacent bus bar 5 is on the outer surface of the upper case 4b on the surface of the upper case 4b. Since it does not exist on a straight line perpendicular to the surface M1, a short circuit between the bus bars 5 can be suppressed. Furthermore, since the plate-shaped short-circuit prevention member 30 is inclined with respect to the outer peripheral surface M1 of the upper case 4b, water that has reached the plate-shaped short-circuit prevention member 30 is on the surface 30a of the plate-shaped short-circuit prevention member 30. Since it does not stay, water can be prevented from collecting on the plate-shaped short-circuit prevention member 30 and causing a short circuit between the bus bars 5.

  As described above, according to the third embodiment of the present invention, the same effect as that of the first embodiment can be obtained. Further, each portion of the adjacent bus bar 5 connected to the electronic substrate 6, that is, the tip of the connection terminal 5 a is positioned on a straight line inclined on the outer surface M 1 of the upper case 4 b on the surface of the upper case 4 b. Yes. As a result, even when water due to condensation flows in a straight line, the tip of the connection terminal 5a of the bus bar 5 does not exist on a straight line perpendicular to the outer peripheral surface M1 of the upper case 4b. As a result, device reliability can be improved.

  Further, a plate-like short-circuit prevention member 30 is erected between each portion of the adjacent bus bars 5 connected to the electronic substrate 6, and the short-circuit prevention member 30 is against the outer peripheral surface M1 of the upper case 4b. It is formed so as to be inclined in a direction along the surface of the upper case 4b. Accordingly, water that reaches the plate-shaped short-circuit prevention member 30 does not stay on the surface of the plate-shaped short-circuit prevention member 30, so that water accumulates on the plate-shaped short-circuit prevention member 30 and is between the bus bars 5. A short circuit can also be prevented, and as a result, device reliability can be improved.

  Finally, the above-described embodiments according to the present invention are examples, and the scope of the invention is not limited thereto. The above-described embodiment can be variously modified. For example, some components may be deleted from all the components shown in the above-described embodiment, and further, components according to different embodiments may be appropriately combined. Also good.

  DESCRIPTION OF SYMBOLS 1 ... Assembly battery apparatus, 2 ... Battery cell, 4 ... Case (casing), 4a ... Lower case (1st case), 4b ... Upper case (2nd case), 5 ... Bus bar (conductive member), 5A ... Positive electrode bus bar (Conductive member), 5B ... negative electrode bus bar (conductive member), 6 ... electronic substrate, 27 ... gas discharge hole, 29 ... water blocking rib, 30 ... short-circuit preventing member, 31 ... terminal block, 32 ... mounting table, 32a ... Groove part, 32d ... screw hole, 33 ... pressing member, 33c ... through hole, 36 ... positive electrode screw (screw), 37 ... negative electrode screw (screw), 64 ... convex part, 64a ... screw hole, H1 ... through hole

Claims (5)

The body,
A plurality of battery cells housed in the housing;
A plate-like external output terminal electrically connected to the battery cell;
A terminal block to which the external output terminal is connected;
With
The terminal block is
A mounting table having a groove on which a part of the external output terminal is mounted;
A holding member which is provided on the mounting table so as to intersect the groove and has conductivity;
It has
A screw hole is formed on the bottom surface of the groove,
A part of the external output terminal placed in the groove is formed with a through hole through which a screw passes.
A through hole through which the screw passes is formed in the presser member,
The assembled battery device is characterized in that a depth of the groove is shallower than a thickness of the external output terminal. The body,
A plurality of battery cells housed in the housing;
A plate-like external output terminal electrically connected to the battery cell;
A terminal block to which the external output terminal is connected;
With
A through hole is formed in the external output terminal,
The terminal block is
A mounting table on which a part of the external output terminal is mounted;
A protrusion formed on the top surface of the mounting table;
It has
A screw hole is formed on the upper surface of the convex portion,
The assembled battery device, wherein the height of the convex portion is lower than the thickness of the external output terminal. A rectangular box-shaped enclosure;
A plurality of battery cells housed in the housing;
With
A rectangular gas discharge hole for discharging the gas generated from the battery cell is formed on the surface of the casing,
On the edge of the gas discharge hole, a rectangular frame-shaped water shield rib rising from the edge is formed,
The assembled battery device, wherein an outer peripheral surface of the water shielding rib is inclined in a direction along the surface of the casing with respect to an outer peripheral surface of the casing. A rectangular box-shaped enclosure;
A plurality of battery cells housed in the housing;
A plurality of plate-like conductive members which are provided on the surface of the casing and electrically connect the plurality of battery cells;
An electronic board provided on the plurality of conductive members, to which the plurality of conductive members are electrically connected, and
With
Each of the conductive members adjacent to each other connected to the electronic board is located on a straight line that is inclined with respect to the outer peripheral surface of the casing on the surface of the casing. A rectangular box-shaped enclosure;
A plurality of battery cells housed in the housing;
A plurality of plate-like conductive members which are provided on the surface of the casing and electrically connect the plurality of battery cells;
An electronic board provided on the plurality of conductive members, to which the plurality of conductive members are electrically connected, and
A plate-like short-circuit prevention member that is erected on the surface of the housing and located between the parts connected to the electronic substrate in the adjacent conductive member;
With
The assembled battery device, wherein the short-circuit prevention member is inclined in a direction along the surface of the casing with respect to an outer peripheral surface of the casing.

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