JP2018063913A - Battery unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently protect a temperature sensor assembled to a battery module.SOLUTION: A battery unit comprises: a battery module, in which plural electric cells are housed in a battery case; a housing case having a bottom part and a peripheral wall, and housing the battery module in a space surrounded by the bottom part and the peripheral wall; and a temperature sensor for detecting a temperature of each electric cell. A battery case 52 is provided with a projection part 65B projecting on its outer face part, and being fastened by a fastening member. A side face of the battery case 52 is opposed to the peripheral wall, and the projection part 65B is positioned inside a case of the peripheral wall. A sensor mounting part is provided at the outer face part of the battery case 52 at a position in line with the projection part 65B, and the temperature sensor 74 is mounted to the sensor mounting part.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a battery unit used in a vehicle such as an automobile.

  Conventionally, a technique using a battery module including a plurality of single cells in a vehicle or the like has been put into practical use. Various technologies have been proposed in which a temperature sensor for detecting a battery temperature is attached to the battery module, and the battery temperature is controlled based on the detection result of the temperature sensor, thereby suppressing a decrease in battery life.

  Regarding the mounting of the temperature sensor, for example, in the technique described in Patent Document 1, in the wiring module, a temperature sensor is provided so as to contact a single cell that is a temperature detection target among a plurality of single cells, and an insulating resin resin is provided. The temperature sensor is held by a sensor holding part provided in the protector. In addition, the sensor holding portion of the resin protector is provided with a locking portion that locks the temperature sensor, and a protective wall that covers the temperature sensor is provided, while a locked portion that is locked to the locking portion is provided on the temperature sensor. While providing, it is set as the structure which provides the spring part which urges | biases a temperature sensor in the direction which contacts a cell.

JP 2014-89912 A

  However, in the above prior art, although the side periphery of the temperature sensor is surrounded by a protective wall in a state where the temperature sensor is attached to the wiring module, when the external force is received from the front side of the wiring module, the external force Concerns arise as to whether the temperature sensor can be properly protected. In other words, it is considered necessary to take measures against external forces from the front side.

  This invention is made | formed in view of the said subject, The main objective is to provide the battery unit which can protect suitably the temperature sensor assembled | attached to the battery module.

  Hereinafter, means for solving the above-described problems and the effects thereof will be described. In the following, for ease of understanding, the reference numerals of the corresponding components in the embodiments of the invention are appropriately shown in parentheses, but are not limited to the specific configurations shown in parentheses.

In the first means,
A battery module (11) in which a plurality of single cells (51) are housed in a battery housing member (52);
A housing case (16) having a bottom (31) and a peripheral wall (32), and housing the battery module in a space surrounded by the bottom and the peripheral wall;
A temperature sensor (74) for detecting the temperature of the unit cell;
A battery unit (10) comprising:
The battery housing member includes a fastening portion (65, 70) that is provided protruding from the outer surface portion thereof and fastened by a fastening member (N).
The side surface of the battery housing member faces the peripheral wall portion, and the fastening portion is located inside the case of the peripheral wall portion,
A sensor attachment portion (73) is provided at a position aligned with the fastening portion on the outer surface portion of the battery housing member, and the temperature sensor is attached to the sensor attachment portion.

  In the above configuration, the fastening portion protruding from the outer surface portion of the battery housing member is a portion where fastening by a fastening member such as a screw or a bolt is performed, and is naturally a portion having a certain degree of strength. And a fastening part is located inside a surrounding wall part in a storage case, and the temperature sensor is attached to the position which aligns with a fastening part in the outer surface part of a battery storage member. In this case, even if the peripheral wall portion is deformed or is likely to be deformed by an external force, the peripheral wall portion is deformed by the inner fastening portion (that is, the fastening portion formed to protrude from the outer surface portion of the battery housing member). Is suppressed. That is, deformation or the like of the peripheral wall portion on the front side of the temperature sensor is suppressed. For this reason, it is possible to suppress the trouble caused by the external force from affecting the temperature sensor attached to the sensor attachment portion of the outer surface portion of the battery housing member. As described above, the temperature sensor can be suitably protected in the battery module.

  In addition, since the trouble due to the deformation of the peripheral wall portion can be avoided, the temperature sensor can be disposed in the vicinity of the peripheral wall portion, and the dead space in the vicinity of the peripheral wall portion can be effectively used.

  In the second means, the fastening portion is a module fixing fastening portion (65) for fixing the battery module to the housing case, and the module fixing fastening portion is located above the bottom portion in the housing case. It is being fixed to the module fixing | fixed part (33) which has a fixing point in the position which becomes.

  In the case where the module fixing portion is provided at a position above the bottom in the housing case, the height position of the module fixing portion corresponds to the position of the module fixing fastening portion in the battery housing member. The position of the module fixing fastening portion of the battery housing member is determined according to the setting of the height position of the fixing portion. In this case, a protective space for protecting the temperature sensor is preferably provided between the peripheral wall portion of the housing case and the battery housing member by setting the module fixing fastening portion to a position higher than the bottom portion. Can do.

  In the third means, the module fixing portion extends from the bottom portion and is provided integrally with the peripheral wall portion.

  Since the module fixing part extends from the bottom and is provided integrally with the peripheral wall part, it is possible to increase the strength of the fixing part itself and to increase the strength of the module fixing fastening part fixed to the module fixing part. It becomes. Thereby, the reliability in protecting the temperature sensor can be further enhanced.

  In the fourth means, the temperature sensor is attached at a position closer to the bottom than the end of the module fixing fastening portion opposite to the bottom.

  The temperature sensor is attached at a position closer to the bottom than the end opposite to the bottom of the module fixing fastening portion, so that the temperature sensor is located in a region from the module fixing fastening portion to the bottom as viewed in a direction perpendicular to the bottom. Will be placed. In this case, further optimization can be realized in protecting the temperature sensor.

  In the fifth means, the battery housing member has a plurality of side portions that are oriented to cross each other, and at least one of the plurality of module fixing fastening portions is provided in the lateral direction of the peripheral wall portion. The temperature sensor is attached to a position between the plurality of module fixing and fastening portions.

  Protection for protecting the temperature sensor between the peripheral wall portion of the housing case and the battery housing member by attaching the temperature sensor at a position between the plurality of module fixing fastening portions on the side portion of the battery housing member. Space can be made stronger.

  In a sixth means, the battery housing member is for housing the cells in a stacked state, and has an intermediate partition portion (62) for partitioning the battery housing portion (63) for each unit cell, The module fixing fastening portion is provided at a position on an extension line from which the intermediate partition portion extends.

  According to the above configuration, even if an expansion / contraction action occurs in the intermediate partition portion due to the heat of the unit cells, the expansion / contraction is suppressed by the module fixing fastening portion. In this case, the module fixing fastening portion can be provided with a temperature sensor protection function and a battery housing member deformation suppression function.

  In the seventh means, in the battery module, the battery housing member has an opening (64) into which the unit cell is inserted, and a cover member (53) is attached to the side of the opening. The fastening portion is a cover fixing fastening portion (70) for fixing the cover member to the battery housing member in the battery module, and the temperature sensor is attached to a position aligned with the cover fixing fastening portion. .

  If it is a fastening part protrudingly formed on the outer surface part of the battery housing member, even if it is a cover fixing fastening part for fixing the cover member, the same effect as described above is produced. That is, even if the peripheral wall portion is deformed or is likely to be deformed by an external force, the deformation of the peripheral wall portion is suppressed by the inner cover fixing fastening portion. Thereby, a temperature sensor can be protected suitably.

  In the eighth means, the protruding dimension of the temperature sensor toward the peripheral wall part is smaller than the protruding dimension of the fastening part on the outer surface part of the battery housing member.

  Since the projecting dimension of the temperature sensor to the side of the peripheral wall is smaller than the projecting dimension of the fastening part, the separation distance from the peripheral wall to the temperature sensor can be increased, and a suitable configuration for protecting the temperature sensor. realizable.

  In the ninth means, the fastening portion is provided at a portion of the outer surface portion of the battery housing member where the electrode (56) of the unit cell is not provided.

  It is assumed that a structure portion such as an insulating portion or a bus bar is provided at a portion where the electrode of the unit cell is provided. In addition, it is assumed that the part where the electrode is provided is arranged at a part near the center of the unit far from the peripheral wall. On the other hand, it is assumed that the portion of the outer surface portion of the battery housing member on the side where the unit cell electrode is not provided is close to the peripheral wall portion and the structure portion is not provided. In this respect, since the fastening portion is provided in the portion of the outer surface portion of the battery housing member where the unit cell electrode is not provided and the temperature sensor is provided in the vicinity of the fastening portion, the temperature sensor is provided when an external force is generated on the peripheral wall portion. It can protect suitably.

  In the tenth means, the unit cells are laminated in three or more stages in the direction orthogonal to the bottom portion in the battery housing member, and each of the battery housing members laminated in the three or more stages is arranged. The temperature sensor is attached to a position corresponding to the middle cell of the cells.

  In the case where the unit cells are stacked in three or more stages, there is a concern that the intermediate unit cell will become particularly hot. In this respect, since the temperature sensor is attached at a position corresponding to the single-stage cell, the temperature of the cell can be appropriately managed.

The perspective view which shows the whole structure of a battery unit. The disassembled perspective view which decomposes | disassembles and shows the main structures of a battery unit. The longitudinal cross-sectional view of a battery unit. The perspective view which shows the state which removed the cover in the battery unit. The top view of a base. The perspective view of a base. The exploded perspective view of a battery module. The perspective view of a battery main-body part. The perspective view of a battery case. The perspective view of a battery case. Schematic which shows a base and a battery case. The perspective view of a temperature sensor. (A) is the side view which looked at the battery case from the side, (b) is the top view of a battery case and a base. The top view of a battery case. The longitudinal cross-sectional view of a battery case. The perspective view which shows the state which assembled | attached the battery module with respect to the base. The top view which shows the state which assembled | attached the battery module with respect to the base. The longitudinal cross-sectional view in the position which passes the coupling | bond part of an intermediate structure part. The longitudinal cross-sectional view in the position which passes the penetration hole of an intermediate structure part. The top view which shows arrangement | positioning with each cell and each fixing | fixed part. The figure which shows the thermal radiation state of a battery module. The schematic which shows a base and a battery case in another example. The schematic which shows a base and a battery case in another example. The schematic which shows a base and a battery case in another example. The schematic which shows a base and a battery case in another example.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings. In the present embodiment, it is assumed that the power supply system is embodied in a vehicle, and this power supply system is charged and discharged in a power storage unit (power supply unit) for supplying electric power to various on-vehicle electric loads. Are sequentially controlled. The vehicle is an internal combustion engine, an in-vehicle ECU that controls the engine and other components, a power generation function that is driven by the rotation of the engine and axle, and a power running function that rotates the engine and axle. ), A power storage unit charged by the power generated by the rotating electrical machine, and various electric loads. In particular, a lead storage battery and a lithium ion storage battery are used as the power storage unit of the vehicle. In the present embodiment, a Li battery unit (hereinafter simply referred to as a battery unit) that functions as a lithium ion storage battery will be described in detail.

  First, the overall configuration of the battery unit 10 will be described with reference to FIGS. In the following description, for the sake of convenience, the vertical direction of the battery unit 10 is defined with reference to FIG. 1 in which the battery unit 10 is installed on a horizontal plane.

  The battery unit 10 includes a battery module 11 having a plurality of can-type cells, a control board 12 for controlling charge / discharge of the battery module 11, and a plate 13 provided along the upper surface of the battery module 11. Terminal modules 14 and 15 in which power is input and output, and a housing case 16 that houses the battery modules 11 and the like. The housing case 16 has a substantially rectangular parallelepiped shape, and includes a base 17 that is fixed to the mounting location of the battery unit 10 and a cover 18 that is attached above the base 17. Each of the base 17 and the cover 18 is made of a metal material such as aluminum, or is made of a synthetic resin material.

  The battery module 11, the control board 12 and the plate 13 are arranged vertically so that the plate 13 is positioned on the battery module 11 and further the control board 12 is positioned thereon. It is fixed by a fastening member N such as a bolt. More specifically, as shown in FIGS. 3 and 4, the battery module 11 has an upper surface formed in a step shape according to the battery stacking state, and the stepped plate 13 is assembled along the step on the upper surface. It has been. The plate 13 is a deformation suppressing plate for suppressing deformation occurring in the battery module 11, and is made of, for example, a highly rigid metal plate. Further, the control board 12 is assembled above the low position side of the high position side and the low position side of the upper surface of the battery module 11. When viewed in the height direction, the control board 12 and the upper part of the plate 13 are substantially at the same position. The battery module 11, the control board 12, and the like are accommodated in the accommodation case 16 by assembling the cover 18 from above with respect to the base 17.

  The terminal modules 14 and 15 have output terminals connected to lead-acid batteries, rotating electric machines, and electric loads, respectively. Specifically, as shown in FIG. 2, the terminal module 14 has an output terminal 21 connected to, for example, a lead storage battery, and an output terminal 22 connected to the rotating electrical machine. Each of these output terminals 21 and 22 is provided integrally with a terminal base 23 formed of an insulating material, and each terminal 21 and 22 is connected to a bus bar 24 that forms a power path. The terminal module 15 has an output terminal 25 connected to an electric load. The output terminal 25 is provided on the terminal block 26, and a bus bar 27 is connected thereto. These terminal modules 14 and 15 are fixed to the base 17.

  Next, a characteristic configuration of the battery unit 10 in the present embodiment will be described in detail. First, the base 17 of the housing case 16 will be described with reference to FIGS. 5 and 6.

  The base 17 includes a bottom plate portion 31 and a peripheral wall portion 32 provided upright from the bottom plate portion 31. The bottom plate portion 31 has a substantially rectangular shape, and a peripheral wall portion 32 is provided so as to surround the peripheral edge portion or the vicinity of the peripheral edge portion. The battery module 11 is assembled so as to face the bottom plate portion 31. When the battery module 11 is assembled on the bottom plate portion 31, the battery module 11 is surrounded by the peripheral wall portion 32. Although the configuration of the battery module 11 will be described in detail later, the battery module 11 is configured by arranging the single cells 51 in a line along the bottom plate portion 31, and the base 17 (accommodating case 16) is arranged with the single cells 51. The direction is the longitudinal direction, and the direction orthogonal to the direction is the short direction.

  The base 17 is provided with a plurality of fixing portions 33 to 35 for fixing the battery module 11, the control board 12, and the plate 13, respectively. These fixing portions 33 to 35 are provided so as to protrude from the bottom plate portion 31 or the peripheral wall portion 32 in a boss shape, and are pedestal portions for fixing the battery module 11, the control board 12, and the plate 13 to predetermined height positions, respectively. It has become.

  Among these, the module fixing part 33 which fixes the battery module 11 is provided in three places of the both-ends position which becomes both ends along one side (this embodiment longitudinal direction) of the baseplate part 31, and the intermediate position between them. Yes. More specifically, two module fixing portions 33 are provided at both ends of the bottom plate portion 31, and the module fixing portion 33 is provided at one location at the intermediate position. Similarly, plate fixing portions 34 for fixing the plate 13 are also provided at three positions of both end positions and an intermediate position along one side of the bottom plate portion. Substrate fixing portions 35 for fixing the control substrate 12 are provided at two positions, one end position and an intermediate position of the bottom plate portion. In addition, the number of the fixing parts 33 to 35 at each position is arbitrary.

  Each of the fixed portions 33 to 35 has a flat upper surface extending in the same direction as the bottom surface of the bottom plate portion 31, and screw holes are formed in the upper ends of the respective fixed portions 33 to 35. The fixed portions 33 to 35 are in a state where the fixed portions of the battery module 11, the control board 12, and the plate 13 are in contact with the upper end surfaces thereof, and these members are fixed by the fastening member N in this state. It has come to be. As another fastening method, an anchor bolt extending upward from the upper end surface is provided in each of the fixing portions 33 to 35, and the battery module 11, the control board 12, and the plate 13 are fixed by fastening to the anchor bolt. May be.

  Here, as shown in FIG. 6, the fixing portions 33 to 35 are arranged in three places in the longitudinal direction of the base 17 (battery arrangement direction). That is, the fixing portions 33 to 35 are arranged in both end regions A1 and A2 in the longitudinal direction of the base 17 and an intermediate region A3 therebetween. In each of these areas A1 to A3, the fixed parts belonging to each area are integrally provided so that at least a part thereof is continuously connected. The module fixing portion 33, the plate fixing portion 34, and the substrate fixing portion 35 are provided in one end region A1 and the intermediate region A3, and the module fixing portion 33 and the plate fixing portion 34 are provided in the other end region A2. And are provided. In the following description, for convenience, the fixing portions 33 to 35 belonging to the end region A1 are collectively referred to as “fixing portion X1”, and the fixing portions 33 and 34 belonging to the end region A2 are collectively referred to as “fixing portion X2”. The fixed portions 33 to 35 belonging to A3 are collectively referred to as “fixed portion X3”.

  In the fixing part X <b> 1, the fixing parts 33 to 35 are provided so as to extend from the bottom plate part 31 of the base 17 and to be integrated with the peripheral wall part 32. Further, in the fixing portion X <b> 2, the fixing portions 33 and 34 are provided so as to extend from the bottom plate portion 31 of the base 17 and be integrated with the peripheral wall portion 32.

  Note that the battery module 11 has a battery stacking portion and a battery stacking portion, and in contrast to these portions, the end region A1 is provided on the battery stacking side, and the end portion Region A2 is provided on the side of the three-tier battery stack.

  Each of the fixing portions 33 to 35 has a height from the bottom plate portion 31, in other words, a height position of an upper end with respect to the bottom plate portion 31. In this case, the module fixing portion 33 is lower than the upper end of the peripheral wall portion 32. Therefore, the fixing point for fixing the battery module 11 is lower than the peripheral wall portion 32. Further, a part of the plate fixing part 34 is substantially the same height as the upper end of the peripheral wall part 32, and the other part is lower than that according to the level difference of the plate 13. Therefore, a part of the fixing point for fixing the plate 13 is the same position as the peripheral wall part 32, and the other is a position lower than the peripheral wall part 32. The board fixing part 35 is substantially the same height as the upper end of the peripheral wall part 32. Therefore, the fixing point for fixing the control board 12 is in the same position as the peripheral wall portion 32.

  In particular, the module fixing portion 33 has the same height for the two module fixing portions 33 in the end region A1. In the end region A2, the heights of the two module fixing portions 33 are different.

  The base 17 is provided with an element pedestal portion 37 to which a semiconductor power element 36 for power control (see FIG. 2) is attached. The element base 37 has a flat upper surface, and the power element 36 is mounted on the upper surface via an insulating sheet 38 (see FIG. 2). The element base 37 is provided at a position adjacent to the battery module 11. The element pedestal portion 37 is a heat radiating portion that releases heat generated in the power element 36 to the outside, and a heat radiating rib is provided below (back side). In this case, the heat generated in the power element 36 is transmitted to the element base 37 and further released to the outside of the unit.

  As shown in FIG. 3, the cover 18 includes a top plate portion 41 and a hanging wall portion 42 extending from the top plate portion 41. The cover 18 is assembled to the base 17 in a state in which the peripheral wall portion 32 of the base 17 is placed on the inside of the case and the hanging wall portion 42 of the cover 18 is placed on the inside and outside of the case.

  Next, the battery module 11 will be described.

  As shown in FIG. 7, the battery module 11 is roughly divided into a plurality of (in the present embodiment, five) unit cells 51, a battery case 52 that houses these unit cells 51, and an insulation that is assembled to the battery case 52. A cover 53 and an exhaust duct 54 provided to overlap the insulating cover 53 are provided on the side of the insulating cover 53 opposite to the battery. Among these, a plurality of unit cells 51, a battery case 52 that accommodates the cells 51 in a stacked state, and an insulating cover 53 constitute a battery body Y, and the battery body Y is shown in FIG.

  Each of the five unit cells 51 is a lithium ion storage battery having a thin rectangular parallelepiped shape. As shown in FIG. 7, each single cell 51 has positive and negative terminals 56 on one side surface, and an exhaust valve 57 is provided between the positive and negative terminals 56. . The exhaust valve 57 is a safety valve that is broken and opened when the internal pressure of the unit cell 51 becomes an abnormal pressure. For example, the exhaust valve 57 is configured by closing a hole opened in the end surface of the outer case of the unit cell 51 with a thin metal film. Has been. When the internal pressure of the unit cell 51 becomes abnormal, the gas inside the battery is released to the outside of the battery by breaking the metal film of the exhaust valve 57. Thereby, cell internal pressure falls and the burst of the cell itself is suppressed.

  The battery case 52 is a battery housing member that houses five unit cells 51 and is arranged in a predetermined stacked state, and is made of, for example, an insulating synthetic resin material. 9 and 10 are perspective views of the battery case 52 as seen from different directions.

  As shown in FIG. 9 and FIG. 10, the battery case 52 includes an outer peripheral portion 61 that surrounds the periphery, and a plurality of partition portions 62 that are provided between the unit cells 51 that are stacked one above the other. The partition part 62 corresponds to an intermediate partition part. The outer peripheral portion 61 and the partition portion 62 form five battery accommodating portions 63 for each unit cell 51. The battery accommodating part 63 is opened on one surface side of the case side part, and the unit cell 51 is inserted through the opening part 64. In the present embodiment, five unit cells 51 are divided into a two-tier battery group and a three-tier battery group and arranged side by side, that is, in a direction along the bottom plate portion 31 of the base 17. The five battery housing parts 63 are provided side by side in two-tiered and three-tiered parts.

  The outer peripheral portion 61 includes a lower plate portion 61 a that becomes the lower surface portion of the battery module 11 and faces the bottom plate portion 31 of the base 17, and an upper plate portion 61 b that becomes the upper surface portion of the battery module 11. In the present embodiment, the five unit cells 51 are divided into a two-tier battery group and a three-tier battery group, and the upper surface portion (upper plate portion 61 b) of the outer peripheral portion 61 has a single cell. A step corresponding to the thickness of one battery is formed.

  Each unit cell 51 has a pair of maximum surfaces in which the thickness dimension in the stacking direction is smaller than the width dimension in the direction orthogonal to the stacking direction and the area is maximum on the battery outer peripheral surface. In the battery case 52, the single cells 51 are arranged so that one of the pair of maximum surfaces (the lower side in the figure) is the bottom plate part 31 side and the other (the upper side in the figure) is the opposite side of the bottom plate part 31. It is accommodated in a stacked manner. That is, in this embodiment, it is set as the structure which lays the plate-shaped cell 51 sideways, makes it sideways, and arranges in that state. Each unit cell 51 has a rectangular shape in a plan view and is arranged in the longitudinal direction. That is, the unit cell 51 is arranged such that the surface having the largest area among the outer peripheral surfaces of the battery is a rectangle, and the short side portion of the long side portion and the short side portion of the surface is opposed to each other. Has been placed.

  The battery case 52 has projecting portions 65 (65A, 65B) projecting from the outer surface at both ends in the longitudinal direction. The protruding portion 65 is a fastening portion that is fastened by the fastening member N, and particularly corresponds to a module fixing fastening portion that fixes the battery module 11 to the base 17. Two protrusions 65 are provided at both ends in the longitudinal direction of the battery case 52, and are fastened to the module fixing part 33 of the base 17 by fastening members N, respectively. Note that a fastening portion is not provided on the back side of the battery case 52 (the side opposite to the opening 64). The protruding portion 65 is provided on a portion of the outer surface of the battery case 52 where the terminal 56 of the unit cell 51 is not provided. The protrusion 65 has a through-hole penetrating in the vertical direction, and a cylindrical metal collar 66 is incorporated in the through-hole as a reinforcing member.

  Of the protrusions 65 at both ends in the longitudinal direction of the battery case 52, the protrusions 65A provided on the battery stacking side have the same height position (see FIG. 10). Further, the protrusions 65B provided on the side of the three-stage battery stack are different in height position (see FIG. 9). When collated with the configuration of the base 17 (see FIGS. 5 and 6), the protruding portion 65A on the battery stacking side is fixed to the module fixing portion 33 in the end region A1 of the base 17, so The protrusion 65B on the side of the base 17 is fixed to the module fixing portion 33 in the end region A2 of the base 17.

  The position of each protrusion 65 will be further described with reference to FIG. As described above, the battery case 52 is provided with the partition portions 62 that partition the battery accommodating portions 63 in the battery stacking direction, and the protrusions 65 are provided at positions on the extension lines of the partition portions 62 on the outer surface of the case. ing. In this case, on the two-tiered side of the battery, two projecting portions 65A are provided at a position on the extension line of the partition 62 between the upper and lower two-stage battery accommodating portions 63. Further, on the battery stacking side, one protrusion 65 </ b> B is provided at a position on each extension line of the two partition parts 62 between the upper and lower battery accommodating parts 63. That is, the protrusions 65 </ b> B are distributed and arranged in the two partition parts 62. Further, at this time, the projecting portions 65B are respectively provided on the extended lines of the partition portions 62 on both sides with the intermediate unit cell 51 interposed therebetween. In FIG. 11, a state in which the protrusions 65 </ b> A and 65 </ b> B are fixed on the module fixing portion 33 is shown.

  Each projecting portion 65 projects from the outer surface of the battery case 52 and is a fastening portion to which a fastening member N such as a screw or a bolt is fastened. Therefore, each projecting portion 65 has a higher strength than other parts. Further, since the collar 66 is incorporated in each protrusion 65, the strength is further increased. Here, in the battery case 52, it is conceivable that the battery cell 52 becomes high temperature due to the heat generated by the unit cell 51, and the partition part 62 expands and contracts. Since it is provided, the expansion and contraction of the partition part 62 is suppressed.

  In the battery case 52, a flange 69 is formed around the opening 64 so as to protrude from the outer surface of the case and extend outward in both ends in the longitudinal direction. Each flange 69 is provided with a fastening portion 70 to which the insulating cover 53 is attached by fastening the fastening member N at two locations on the upper and lower sides. The fastening portion 70 is a portion corresponding to a cover fixing fastening portion that fixes the insulating cover 53 to the battery case 52. The fastening portion 70 has a through-hole penetrating in the cover assembling direction, and a cylindrical metal collar 71 is incorporated in the through-hole as a reinforcing member. The collar 71 may be formed with a female screw.

  As shown in FIGS. 8 and 9, the battery case 52 is provided with an opening 73 at one side end in the longitudinal direction thereof, and the opening 73 is used as a sensor mounting portion. A temperature sensor 74 for detecting temperature is attached. The opening 73 corresponds to the middle unit cell 51 which is the middle stage of the upper and lower three-stage unit cells 51, on the three-stage side of the two-stage battery side and the three-stage battery side. It is provided in the position to do. Further, the opening 73 is provided at a position close to the protruding portion 65B, particularly at a position between the two protruding portions 65B in the present embodiment. Therefore, since the protrusion 65B is provided so as to protrude from the outer surface of the battery case 52, the temperature sensor 74 is attached at a position recessed from the position of the protrusion tip side of the protrusion 65B. .

  The configuration of the temperature sensor 74 will be described with reference to FIG. The temperature sensor 74 has two element portions 75 (thermistors), and engaging portions 76 are provided at both ends of each element portion 75. The temperature sensor 74 is assembled to the battery case 52 by engaging the engaging portion 76 with the peripheral portion of the opening 73. The engaging portion 76 has an elastic force, and the elastic force causes the element portion 75 to be urged toward the unit cell 51 and to be pressed against the outer surface of the unit cell 51. A terminal part 77 is attached to each element part 75, and a harness H is connected to the terminal part 77 (see FIG. 8).

  In the state where the temperature sensor 74 is attached to the battery case 52, two element portions 75 are provided for the same unit cell 51 in the stacking direction of the unit cells 51 (also in the battery thickness direction).

  13A and 13B are schematic views showing the mounting position of the temperature sensor 74 in the battery case 52, where FIG. 13A is a side view of the battery case 52 viewed from the side, and FIG. 13B is a side view of the battery case 52 and the base 17. It is a top view.

  As shown in FIG. 13A, the height position of the temperature sensor 74 is lower than the upper end of the protrusion 65B (that is, closer to the bottom plate 31 than the end opposite to the bottom plate 31). Position). In this case, the temperature sensor 74 is arranged in a region R from the protruding portion 65B to the bottom plate portion 31 when viewed in the height direction. However, the height position of the temperature sensor 74 is higher than the upper end portion of the projecting portion 65B as long as it is a position between the two projecting portions 65B when viewed in the lateral direction (the surface direction of the bottom plate portion 31 of the base 17). It may be the position.

  13B, when the battery case 52 (battery module 11) is assembled to the base 17, the side surface of the battery case 52 faces the peripheral wall portion 32 of the base 17, and the peripheral wall. The protrusion 65B is located inside the portion 32. In this case, the protrusion 65B is a high-strength part as described above. Therefore, if the protruding portion 65B is positioned inside the peripheral wall portion 32, even if the peripheral wall portion 32 is pressed by an external force and the deformation occurs or is likely to be deformed, the inner protruding portion 65B The deformation of the peripheral wall portion 32 is suppressed. Therefore, it is possible to prevent the temperature sensor 74 from being troubled by an external force. In FIG.13 (b), the protrusion dimension of the temperature sensor 74 to the peripheral wall part 32 side is a thing smaller than the protrusion dimension of the protrusion part 65B.

  In a plan view of the battery module 11, the battery case 52 has a plurality of side portions that are oriented to cross each other, and one of the side portions has a plurality of protruding portions 65 </ b> B in the lateral direction of the peripheral wall portion 32. Is provided. A temperature sensor 74 is attached at a position between the plurality of protrusions 65B.

  As shown in FIG. 7, the insulating cover 53 is attached from the opening 64 side of the battery case 52 in a state where the cell 51 is accommodated in the battery case 52. The insulating cover 53 is provided with a plurality of fastening portions 91 at positions corresponding to the fastening portions 70 of the battery case 52. The battery case 52 and the insulating cover 53 are assembled by fastening with the fastening members N at the fastening portions 70 and 91.

  The insulating cover 53 is provided with a plurality of (in this embodiment, ten) openings 92 into which the respective terminals 56 of the single cells 51 are inserted, and the openings 92 are closed so as to close the openings 92. A plurality of bus bars 93 are attached respectively. These bus bars 93 connect the single cells 51 in series with each other. The insulating cover 53 is provided with five openings 94 corresponding to the positions of the exhaust valves 57 of the single cells 51. A packing 95 is assembled between the unit cell 51 and the insulating cover 53. When the packing 95 is assembled, the opening 94 of the insulating cover 53 and the opening of the packing 95 are communicated with each other. It has become.

  Next, in the battery case 52, a portion where the unit cells 51 are stacked in two layers (two-layer stacked portion of the battery housing portion 63) and a portion where the unit cells 51 are stacked in three layers (three-layer stack of the battery housing portion 63) The intermediate structure part 81 provided between the first part and the second part will be described. FIG. 14 is a plan view of the battery case 52, and FIG. 15 is a longitudinal sectional view of the battery case 52. 15 is a cross-sectional view taken along line 15-15 in FIG.

  As shown in FIGS. 14 and 15, the intermediate structure portion 81 connects the two-stage battery accommodating portion 63 and the three-stage battery accommodating portion 63, while separating the battery accommodating portions 63 from each other. An intermediate recess 82 is provided. The intermediate recess 82 is a portion that opens downward and forms a space Z that extends in a direction orthogonal to the battery arrangement direction. In the space Z, a fixed portion X3 (see FIGS. 5 and 6) of the intermediate region A3 formed to protrude from the bottom plate portion 31 of the base 17 enters from below. In other words, the module fixing portion 33, the plate fixing portion 34, and the substrate fixing portion 35 enter the intermediate recess 82 from below.

  The intermediate structure portion 81 is provided with a coupling portion 83 that is coupled to the distal end side of the module fixing portion 33. The coupling portion 83 has a through hole penetrating in the vertical direction, and a cylindrical metal collar 84 is incorporated as a reinforcing member in the through hole. In this case, in a state where the battery module 11 is assembled to the base 17, the front end portion of the module fixing portion 33 and the coupling portion 83 in the intermediate region A3 come into contact with each other, and the fastening by the fastening member N is performed in that state. Thereby, the battery module 11 (battery case 52) is fixed to the base 17.

  Further, the intermediate structure portion 81 is provided with insertion holes 85 and 86 through which the plate fixing portion 34 and the substrate fixing portion 35 in the intermediate region A3 are inserted, respectively. These insertion holes 85 and 86 are provided one on each side with the coupling portion 83 interposed therebetween.

  In the intermediate region A3, the plate fixing portion 34 and the substrate fixing portion 35 are higher than the module fixing portion 33 (see FIG. 6). Therefore, in a state where the battery module 11 is assembled to the base 17, the plate fixing portion 34 and the substrate fixing portion 35 extend upward through the insertion holes 85, 86, and their tip ends are exposed above the battery case 52. (See FIG. 16). The front ends of the plate fixing portion 34 and the substrate fixing portion 35 extend above the battery case 52. In this state, the plate 13 and the control board 12 are fixed to the plate fixing part 34 and the board fixing part 35.

  As another configuration in FIG. 7, the exhaust duct 54 has a recovery space for recovering gas and electrolyte flowing out from the inside of the battery when the exhaust valve 57 of each unit cell 51 is opened. Further, the exhaust duct 54 has a voltage output path for outputting the terminal voltage of each unit cell 51 to the control board 12 with respect to the assembled battery in which the five unit cells 51 are connected in series.

  Next, the assembled state of the battery module 11 with respect to the base 17 and the battery heat dissipation with respect to the base 17 will be described with reference to FIGS. FIG. 17 is a plan view showing a state in which the battery module 11 is assembled to the base 17. FIG. 18 is a longitudinal cross-sectional view at a position passing through the coupling portion 83 of the intermediate structure portion 81, which corresponds to a cross section taken along line 18-18 in FIG. FIG. 19 is a vertical cross-sectional view at a position passing through the module fixing portion 33 in the end regions A1 and A2, which corresponds to a cross section along line 19-19 in FIG.

  As shown in FIGS. 18 and 19, in a state where the battery module 11 is assembled to the base 17, the fixed portion X1 of the end region A1 and the fixed portion X2 of the end region A2 are located on both ends in the longitudinal direction. The fixed portion X3 of the intermediate region A3 is located in the middle portion in the longitudinal direction. In this case, each fixed battery X1 to X3 is provided as a heat radiating part on both ends of the battery module 11 with the single battery 51 interposed therebetween, and each single battery 51 is interposed via the fixed module X1 to X3. The heat can be released.

  In particular, the fixing part X3 of the intermediate region A3 will be described. In the module fixing part 33, the heat of each unit cell 51 (heat of the battery module 11) is directly transmitted through the coupling part 83 of the intermediate structure part 81, and the intermediate part A3. Heat is transferred from the adjacent single cells 51 in the space Z of the recess 82. Further, in the plate fixing portion 34 and the substrate fixing portion 35, heat is transferred from each unit cell 51 adjacent in the space Z of the intermediate recess 82. Therefore, suitable heat radiation is possible even at the central position where battery heat is likely to accumulate in the battery module 11. The fixed portion X3 of the intermediate region A3 corresponds to an “intermediate heat dissipation portion”. The fixing portions X1 and X2 of the end regions A1 and A2 correspond to “side heat radiating portions”.

  Here, each cell 51 and each fixed part X1-X3 are good to have the following positional relationships. FIG. 20 is a plan view showing the arrangement of the single cells 51 and the fixed portions X1 to X3. In the drawing, * marks indicate the center positions of the single cells 51 and the fixed portions X1 to X3. In FIG. 20, the distance from the center of the unit cell 51 to the intermediate fixed portion X3 is the same for each unit cell 51 (L1 = L2). The center position of each of the fixing portions X1 to X3 in a direction orthogonal to the battery arrangement direction in the plan view (up and down direction in the figure) is preferably located at a position overlapping the side surface range of the single cell 51. This is not a limitation as long as the side faces the fixing portions X1 to X3 as the heat radiating portions.

  Taking into account that the plate 13 is assembled above the battery module 11, the battery module 11 is dissipated as shown in FIG. In this case, at both end positions of the battery module 11, heat is radiated to the peripheral wall portion 32 and the like via the fixing portions X1 and X2 on both sides. In addition, in the middle position of the battery module 11, heat is radiated from the upper surface and the lower surface, which are the maximum surfaces of each unit cell 51, and heat is radiated to the bottom plate portion 31 and the plate 13 via the fixed portion X <b> 3 at the center. Done.

  According to the embodiment described in detail above, the following excellent effects can be obtained.

  In the housing case 16, a protruding portion 65 </ b> B as a fastening portion that is fastened by the fastening member N is disposed inside the peripheral wall portion 32, and the temperature sensor 74 is attached to a position aligned with the protruding portion 65 </ b> B in the battery case 52. . In this case, even if the peripheral wall portion 32 is deformed or is likely to be deformed by an external force, the deformation of the peripheral wall portion 32 is suppressed by the inner protruding portion 65B. That is, deformation or the like of the peripheral wall portion 32 on the front side of the temperature sensor 74 is suppressed. For this reason, it is possible to prevent the temperature sensor 74 attached to the outer surface portion of the battery case 52 from being troubled by an external force. As described above, the temperature sensor 74 can be suitably protected in the battery module 11.

  If the housing case 16 is constituted by the base 17 and the cover 18 and the temperature sensor 74 is housed integrally with the battery module 11 in the housing case 16, the temperature sensor 74 is properly set regardless of the direction of the external force. Can be protected. By improving the protection performance of the temperature sensor 74, temperature measurement accuracy and temperature measurement reliability can be ensured.

  Incidentally, depending on the mounting position of the battery unit 10 in the vehicle, there is a possibility that a large external force may be applied to the battery unit 10 due to a vehicle collision or a leg kick of a crew member. The sensor 74 can be properly protected.

  In addition, since the trouble by the deformation | transformation of the surrounding wall part 32 can be avoided, the temperature sensor 74 can be arrange | positioned in the vicinity of the surrounding wall part 32, and the effective use of the dead space near the surrounding wall part 32 is also attained.

  The protruding portion 65 </ b> B as the module fixing fastening portion is fixed to the module fixing portion 33 having a fixing point at a position above the bottom plate portion 31. In this case, a protective space for protecting the temperature sensor 74 is preferably provided between the peripheral wall portion 32 and the battery case 52 by setting the position of the protruding portion 65B to be higher than the bottom plate portion 31. Can do. That is, by moving the position of the protruding portion 65B away from the bottom plate portion 31, even if an external force is applied near the upper end portion of the peripheral wall portion 32, the influence on the temperature sensor 74 can be suppressed.

  The module fixing portion 33 extends from the bottom plate portion 31 of the base 17 and is provided integrally with the peripheral wall portion 32. Therefore, the strength of the fixing portion itself increases, and as a result, the strength of the protruding portion 65B (module fixing fastening portion) fixed to the module fixing portion 33 can be increased. Thereby, the reliability in protecting the temperature sensor 74 can be further improved.

  Since the temperature sensor 74 is attached to a position below the upper end portion of the protrusion 65B, the temperature sensor 74 is disposed in a region from the protrusion 65B to the bottom plate portion 31 when viewed in the height direction. Therefore, further optimization can be realized in protecting the temperature sensor 74.

  The temperature sensor 74 is attached to a position between the plurality of protruding portions 65 </ b> B in the side portion of the battery case 52. Thereby, the protective space for protecting the temperature sensor 74 between the surrounding wall part 32 and the battery case 52 can be further strengthened.

  The protruding portion 65 </ b> B is configured to be provided at a position on the extended line on which the partition portion 62 extends on the outer surface of the battery case 52. Thereby, even if the expansion / contraction action occurs in the partition part 62 due to the heat of the unit cell 51, the expansion / contraction is suppressed by the protruding part 65B. In this case, the protrusion 65B can be provided with a protection function for the temperature sensor 74 and a deformation suppression function for the battery case 52.

  The projecting dimension of the temperature sensor 74 toward the peripheral wall part 32 is set to be smaller than the projecting dimension of the projecting part 65B. Thereby, the separation distance from the surrounding wall part 32 to the temperature sensor 74 can be enlarged, and a suitable configuration for protecting the temperature sensor 74 can be realized.

  It is assumed that a structure portion such as an insulating portion or a bus bar is provided at a portion where the terminal 56 (electrode) of the unit cell 51 is provided. In addition, it is assumed that the portion where the terminal 56 is provided is disposed in a portion near the center of the unit that is away from the peripheral wall portion 32. On the other hand, it is assumed that the portion of the outer surface portion of the battery case 52 on the side where the terminal 56 of the single cell 51 is not provided is close to the peripheral wall portion 32 and the structure portion is not provided. In this respect, since the protruding portion 65 (fastening portion) is provided in a portion of the outer surface portion of the battery case 52 where the terminal 56 of the unit cell 51 is not provided, and the temperature sensor 74 is provided in the vicinity of the protruding portion 65, the peripheral wall portion. Thus, the temperature sensor 74 can be suitably protected when an external force is generated on the H.32.

  When the unit cells 51 are stacked in three or more stages, there is a concern that the intermediate unit cell 51 will have a particularly high temperature. In this regard, since the temperature sensor 74 is attached at a position corresponding to the intermediate-stage unit cell 51, the temperature of the unit cell 51 can be appropriately managed.

  Two element portions 75 are provided in the temperature sensor 74 and the temperature of the same unit cell 51 is detected by the element portions 75. Thereby, even if it is assumed that an abnormality occurs in the element unit 75, the reliability of temperature detection can be increased.

  In the battery unit 10, when a plurality of unit cells 51 are arranged side by side, heat easily accumulates at an intermediate position between the unit cells 51 and the unit cells 51. In this regard, according to the above configuration, since the fixing portion X3 is provided as an intermediate heat dissipation portion at an intermediate position of each unit cell 51, the heat dissipation performance can be improved. As a result, the heat dissipation of the unit cell 51 can be suitably performed.

  The base plate portion 31 of the base 17 has a configuration in which the fixing portion X3 including the fixing portions 33 to 35 is provided so as to overlap with a portion where the battery module 11 is disposed. In this case, the heat received by the fixing portion X3 is transmitted to the bottom plate portion 31 of the base 17 and further diffused radially in the surface direction of the bottom plate portion 31. Therefore, a configuration suitable for improving the heat dissipation performance can be realized.

  In the battery case 52, the intermediate structure 81 is provided at a position between the plurality of battery accommodating parts 63 arranged side by side, and the fixing portion X3 (intermediate heat dissipation part) is provided so as to enter the intermediate recess 82 of the intermediate structure. It was. In this case, the heat of each unit cell 51 can be suitably received by the fixed portion X3 (intermediate heat dissipation unit) while suppressing the influence of heat between the adjacent unit cells.

  The intermediate structure portion 81 is provided with a coupling portion 83 coupled to the distal end side of the module fixing portion 33, and the coupling portion 83 forms a heat transfer path from the unit cell 51 side to the base 17 side. . In this case, even when the length dimension of the battery case 52 is increased by arranging the plurality of single cells 51 side by side, the battery case 52 can be firmly fixed at the intermediate position. Thereby, the battery module 11 can be stably held in the housing case 16.

  Moreover, the coupling | bond part 83 comprises the heat transfer function which transfers a heat | fever directly from the cell 51 side to the base 17 side, and can implement | achieve favorable heat dissipation performance. Assuming that the coupling portion 83 is coupled to the module fixing portion 33 using a fastening member N such as a screw or a bolt, heat transfer is performed by the fastening member N, and thus heat dissipation via the coupling portion 83 is performed. It is thought that it becomes possible to improve the sex.

  The control board 12 is arranged on the opposite side of the bottom plate part 31 with the battery module 11 in between, and the board fixing part 35 is included in the fixing part X3. In this case, the substrate fixing part 35 can be given a function as an intermediate heat radiating part. In addition, when heat generation of the electrical component mounted on the control board 12 is assumed, it is possible to release heat on the control board 12 side through the fixing part X3 (intermediate heat dissipation part).

  The plate 13 is disposed on the opposite side of the bottom plate portion 31 with the battery module 11 interposed therebetween, and the plate fixing portion 34 is included in the fixing portion X3. In this case, the plate fixing portion 34 can be given a function as an intermediate heat radiating portion.

  The intermediate structure portion 81 is provided with the coupling portion 83 coupled to the module fixing portion 33 and the insertion holes 85 and 86 through which the plate fixing portion 34 and the substrate fixing portion 35 are inserted. A more suitable configuration can be realized for escape.

  Since the fixing portions X1 and X2 as the side heat dissipation portions are provided in addition to the fixing portion X3 as the intermediate heat dissipation portion, the heat of the unit cell 51 is released at both the intermediate position and the end position of the battery case 52. The Thereby, the heat dissipation performance can be further enhanced. In addition, by performing heat radiation on both sides of the unit cell 51, it is possible to suppress the uneven distribution of heat in the unit cell 51. For example, when the unit cell 51 is enlarged in order to increase the amount of current, the performance degradation due to heat can be more preferably suppressed by performing both-side heat dissipation in each unit cell 51.

  In the configuration in which the battery module 11 is fixed to the base 17 by the fixing portion X3 that is the intermediate heat radiating portion and the fixing portions X1 and X2 that are the side heat radiating portions, the fixing points of the battery modules 11 are concentrated at positions in the battery arrangement direction. be able to. Therefore, the fixed point on the side orthogonal to the battery arrangement direction can be eliminated, and an advantageous configuration can be realized for reducing the size of the battery unit 10.

  In the battery module 11, the unit cells 51 having a rectangular shape in plan view are arranged in the longitudinal direction. That is, the short sides of the single cells 51 are adjacent to each other. Thereby, the enlargement of the battery unit 10 by dead space can be suppressed, ensuring the space of the fixing | fixed part X3 as an intermediate | middle heat radiating part in the intermediate position of the longitudinal direction of the battery case 52. FIG.

  It supplements about arrangement | positioning of the cell 51 in the battery module 11. FIG. When arranging a plurality of unit cells 51 side by side in the housing case 16, particularly when arranging the unit cells 51 having a rectangular shape in a plan view in a lying state, there is a concern that the battery unit 10 may be enlarged. In this regard, in the present embodiment, since the single cells 51 are arranged side by side so that the short sides of the single cells 51 face each other, the size of the battery unit 10 can be suppressed. . That is, when comparing the case where the single cells 51 are arranged side by side so that the short side portions face each other, and the case where the single cells 51 are arranged side by side so that the long side portions face each other, the former is The dead space between the single cells 51 is reduced. Therefore, it is possible to realize an advantageous configuration for reducing the size of the battery unit 10.

  A projecting portion 65 as a fastening portion is provided at a position on the outer surface portion of the battery case 52 on the extension line of the partition portion 62. Therefore, even if the expansion / contraction action occurs in the partition 62 due to the temperature change of the unit cell 51, the expansion / contraction is suppressed by the protrusion 65. In particular, since the protruding portion 65B is provided at a position on the extension line of the partition portion 62 while corresponding to the intermediate cell 51 among the plurality of cells 51 stacked in three stages, the intermediate cell 51 Then, in consideration of the concern about the influence of heat, the expansion and contraction (expansion and contraction) of the partition 62 can be appropriately suppressed. Thereby, the stress which generate | occur | produces in the battery case 52 is reduced, and protection of the battery case 52 and the battery module 11 can be aimed at appropriately.

  In the battery case 52, protrusions 65 (fastening portions) are provided on the extended lines of the two partition portions 62 on the side stacked in three stages. In this case, since the protrusions 65 are dispersedly arranged with respect to the partition parts 62, the battery case 52 as a whole can obtain an effect of suppressing expansion and contraction due to temperature changes.

  The projecting portions 65 are provided on the extended lines of the partition portions 62 on both sides of the intermediate unit cell 51, respectively. In this case, a more appropriate expansion / contraction suppression function can be provided around the intermediate stage cell 51 in which the influence of heat is particularly concerned.

  Since the module fixing portion 33 is provided so as to extend from the bottom plate portion 31 and be integrated with the peripheral wall portion 32, the strength of the protruding portion 65 fixed to the module fixing portion 33 can be increased, and the partition portion In order to suppress the expansion and contraction of 62, a more appropriate configuration can be realized.

(Other embodiments)
You may change the said embodiment as follows, for example.

  -In battery case 52, you may arrange | position the protrusion part 65 (module fixing fastening part) and the temperature sensor 74 like FIG. In FIG. 22, one protrusion 65 is provided on each side of the battery case 52. And the temperature sensor 74 is arrange | positioned along with the protrusion part 65 in one side part among them. The position and number of the protrusions 65 in the side part of the battery case 52 can be arbitrarily changed.

  The position where the temperature sensor 74 is provided in the battery case 52 may be a position near the protrusion 65 on the same side as the protrusion 65. For example, the temperature sensor 74 may be provided at a position on the bottom plate portion 31 side of the base 17 with respect to the protruding portion 65. Temperature sensors 74 may be provided on the two side portions of the battery case 52, respectively.

  -In battery case 52, you may provide the protrusion part 65 (module fixed fastening part) so that two or more partition parts 62 adjacent to the lamination direction of the cell 51 may be straddled. In FIG. 23, the protruding portion 65 </ b> C is provided so as to reach both of the two partition portions 62 on the side of the unit cells 51 stacked in three stages. In addition, regarding the relationship between the protrusion 65C and the temperature sensor 74, the temperature sensor 74 may be provided at a side-by-side position of the protrusion 65C.

  According to this configuration, the protrusion 65C can collectively impart the expansion / contraction suppression function for the two or more partition sections 62, and can increase the expansion / contraction suppression function by increasing the size of the protrusion 65C. it can. In addition, since the strength against the external force from the peripheral wall portion 32 is increased, the configuration for protecting the temperature sensor 74 can be optimized.

  In the battery case 52, the unit cells 51 can be stacked in four or more stages. FIG. 24 shows a configuration of the battery case 52 in the case where the unit cells 51 are stacked in four stages. In FIG. 24, four stages of battery housing portions 63 are provided in the vertical direction with respect to the bottom plate portion 31 of the base 17, and each battery housing portion 63 is partitioned by three partition portions 62. And in (a) and (b), the protrusion part 65 is arrange | positioned on the extension line | wire of two or more different partition parts 62, respectively. A combination with the configuration of FIG. 23 is also possible, and any of the protrusions 65 may have a length that extends over two or more partition parts 62.

  The battery case 52 is provided with a flange 69 so as to protrude sideways, and a fastening portion 70 (cover fixing fastening portion) is provided on the flange 69 (see FIGS. 9 and 10). In this case, the relationship between the fastening portion 70 and the temperature sensor 74 is similar to the relationship between the protruding portion 65B of the battery case 52 and the temperature sensor 74, and the position on the protruding tip side of the fastening portion 70 (the protruding tip of the flange 69). The temperature sensor 74 is configured to be attached at a position recessed from the side position. In this case, the fastening portion 70 is a high-strength portion similar to the protruding portion 65B. If the fastening portion 70 is located inside the peripheral wall portion 32, the peripheral wall portion 32 is temporarily pressed by an external force and deformed. Even if it occurs or is likely to be deformed, deformation of the peripheral wall portion 32 is suppressed by the inner fastening portion 70. Therefore, it is possible to prevent the temperature sensor 74 from being troubled by an external force.

  In short, the fastening portion 70 can be expected to protect the temperature sensor 74 in the same manner as the protruding portion 65B. From this point, it is preferable that the temperature sensor 74 is attached to a position aligned with the fastening portion 70 on the outer surface portion of the battery case 52. That is, even if the protrusion 65B is not provided in the vicinity of the temperature sensor 74 at the side end of the battery case 52, the temperature sensor 74 can be protected by the fastening portion 70 formed on the flange 69.

  -You may change the structure of the thermal radiation part in the battery unit 10 as follows. For example, as shown in FIG. 25, heat dissipating members 101 and 102 as side heat dissipating portions are provided on both sides of each side-by-side unit cell 51, and a heat dissipating member 103 as an intermediate heat dissipating unit is provided at an intermediate position of each unit cell 51. It is set as the structure which provides. In this case, the heat radiating member 103 is composed of a plurality of members provided individually with respect to the bottom plate portion 31. The heat radiating members 101 to 103 may not have a fixing function for fixing the battery module 11 or the like.

  The battery case 52 may have a configuration in which the protrusions 65 are provided at positions on the extension lines of the partition 62, and the protrusions 65 may be provided on both sides in the extending direction of the partition 62.

  In the above embodiment, in the battery module 11, the unit cells 51 that are rectangular in plan view are arranged side by side in the longitudinal direction, but this may be changed and the unit cells 51 may be arranged in the short direction. Good. Moreover, the unit cell 51 may have a square shape in plan view. Further, in the battery module 11, instead of the configuration in which the plurality of single cells 51 are stacked in the horizontal direction on the bottom plate portion 31 of the base 17, the plurality of single cells 51 may be stacked in the vertical direction. .

  -It replaces with the structure which uses a lithium ion storage battery as a single battery, and it is good also as a structure which uses other secondary batteries, such as a nickel cadmium storage battery and a nickel hydride storage battery. In addition, the battery unit 10 can be used for purposes other than vehicles.

  DESCRIPTION OF SYMBOLS 10 ... Battery unit, 11 ... Battery module, 16 ... Housing case, 31 ... Bottom plate part, 32 ... Peripheral wall part, 51 ... Single cell, 52 ... Battery case (battery housing member), 65 ... Projection part (fastening part), 73 ... opening (sensor mounting part), 74 ... temperature sensor, N ... fastening member.

Claims (10)

A battery module (11) in which a plurality of single cells (51) are housed in a battery housing member (52);
A housing case (16) having a bottom (31) and a peripheral wall (32), and housing the battery module in a space surrounded by the bottom and the peripheral wall;
A temperature sensor (74) for detecting the temperature of the unit cell;
A battery unit (10) comprising:
The battery housing member includes a fastening portion (65, 70) that is provided protruding from the outer surface portion thereof and fastened by a fastening member (N).
The side surface of the battery housing member faces the peripheral wall portion, and the fastening portion is located inside the case of the peripheral wall portion,
A battery unit in which a sensor attachment portion (73) is provided at a position aligned with the fastening portion on the outer surface portion of the battery housing member, and the temperature sensor is attached to the sensor attachment portion. The fastening portion is a module fixing fastening portion (65) for fixing the battery module to the housing case,
The battery unit according to claim 1, wherein the module fixing fastening portion is fixed to a module fixing portion (33) having a fixing point at a position above the bottom portion in the housing case.   The battery unit according to claim 2, wherein the module fixing portion extends from the bottom portion and is provided integrally with the peripheral wall portion.   4. The battery unit according to claim 2, wherein the temperature sensor is attached at a position closer to the bottom than an end opposite to the bottom in the module fixing fastening portion. 5. The battery housing member has a plurality of side portions that are oriented to cross each other, and at least one of them is provided with a plurality of the module fixing fastening portions in the lateral direction of the peripheral wall portion,
The battery unit according to any one of claims 2 to 4, wherein the temperature sensor is attached to a position between the plurality of module fixing and fastening portions. The battery accommodating member accommodates the unit cells in a stacked state, and has an intermediate partition part (62) that partitions the battery accommodating part (63) for each unit cell,
6. The battery unit according to claim 2, wherein the module fixing fastening portion is provided at a position on an extension line from which the intermediate partition portion extends. In the battery module, the battery housing member has an opening (64) into which the unit cell is inserted, and a cover member (53) is attached to the opening side.
The fastening portion is a cover fixing fastening portion (70) for fixing the cover member to the battery housing member in the battery module,
The battery unit according to claim 1, wherein the temperature sensor is attached to a position aligned with the cover fixing fastening portion.   8. The protrusion size of the temperature sensor toward the peripheral wall portion side is smaller than the protrusion size of the fastening portion on the outer surface portion of the battery housing member. Battery unit.   The battery unit according to any one of claims 1 to 8, wherein the fastening portion is provided in a portion of the outer surface portion of the battery housing member where the electrode (56) of the unit cell is not provided. In the battery housing member, the unit cells are stacked in three or more stages in a direction orthogonal to the bottom,
10. The temperature sensor is attached to the battery housing member at a position corresponding to an intermediate unit cell among the unit cells stacked in three or more stages. 10. Battery unit.

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