JP6693381B2 - Battery unit - Google Patents

Description

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

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

  Regarding the attachment of the temperature sensor, for example, in the technique described in Patent Document 1, in the wiring module, the temperature sensor is provided so as to come into contact with a single cell that is a temperature detection target among the plurality of single cells, and a resin made of an insulating resin is used. The temperature sensor is held by the sensor holding portion provided on 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 the temperature sensor has a locked portion that is locked by the locking portion. In addition to being provided, a spring portion for urging the temperature sensor in the direction of contacting the unit cell is provided.

JP, 2014-89912, A

  However, in the above-mentioned prior art, although the side circumference of the temperature sensor is surrounded by the protective wall in the 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 is On the other hand, there is concern about whether the temperature sensor can be properly protected. In other words, it is considered necessary to take measures against such external forces from the front side.

  The present invention has been made in view of the above problems, and a main object thereof is to provide a battery unit capable of suitably protecting a temperature sensor assembled in a battery module.

  Hereinafter, the means for solving the above problems, and the operation and effect thereof will be described. In the following, for ease of understanding, the reference numerals of corresponding configurations in the embodiments of the present invention are shown in parentheses, etc., but the present invention is not limited to the specific configurations shown in parentheses.

In the first way,
A battery module (11) in which a plurality of cells (51) are housed in a battery housing member (52);
An accommodating case (16) having a bottom part (31) and a peripheral wall part (32) and accommodating the battery module in a space surrounded by the bottom part and the peripheral wall part;
A temperature sensor (74) for detecting the temperature of the unit cell;
A battery unit (10) comprising:
The battery accommodating member is provided with a fastening portion (65, 70) that is provided so as to project on the outer surface portion thereof and is fastened by the 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 mounting 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 mounted on the sensor mounting portion.

  In the above-mentioned structure, the fastening portion projectingly formed on the outer surface portion of the battery accommodating member is a portion to be fastened by a fastening member such as a screw or a bolt, and naturally has a certain high strength. The fastening portion is located inside the peripheral wall portion of the housing case, and the temperature sensor is attached to the outer surface of the battery housing member at a position aligned with the fastening portion. In this case, even if the peripheral wall portion is deformed or is likely to be deformed due to an external force, the peripheral wall portion is deformed by the inner fastening portion (that is, the fastening portion projectingly formed on the outer surface portion of the battery housing member). Is suppressed. That is, deformation of the peripheral wall portion on the front side of the temperature sensor is suppressed. Therefore, it is possible to prevent the temperature sensor attached to the sensor attachment portion on the outer surface of the battery housing member from being hindered by an external force. As described above, the temperature sensor can be preferably protected in the battery module.

  Since it is possible to avoid the hindrance due to the deformation of the peripheral wall portion, the temperature sensor can be arranged near the peripheral wall portion, and the dead space near the peripheral wall portion can be effectively used.

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

  In the configuration in which the module fixing portion is provided at a position above the bottom portion in the housing case, the height position of the module fixing portion and the position of the module fixing fastening portion in the battery housing member correspond to each other. The position of the module fixing and fastening portion of the battery housing member is determined according to the setting of the height position of the fixing portion. In this case, by providing the module fixing and fastening portion at a position higher than the bottom portion, 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. You can

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

  Since the module fixing portion extends from the bottom portion and is integrally provided on the peripheral wall portion, the strength of the fixing portion itself is increased, and thus the strength of the module fixing fastening portion fixed to the module fixing portion can be increased. Becomes Thereby, the reliability in protecting the temperature sensor can be further improved.

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

  By mounting the temperature sensor at a position closer to the bottom than the end on the side opposite to the bottom in the module fixing fastening part, the temperature sensor is installed in the area from the module fixing fastening part to the bottom when viewed in the direction orthogonal to the bottom. Will be placed. In this case, it is possible to further optimize the protection of the temperature sensor.

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

  By mounting the temperature sensor at a position between the plurality of module fixing and fastening portions on the side portion of the battery housing member, protection for protecting the temperature sensor is provided between the peripheral wall portion of the housing case and the battery housing member. The space can be made even stronger.

  In a sixth means, the battery accommodating member accommodates the cells in a stacked state, and has an intermediate partition part (62) for partitioning a battery accommodating part (63) for each of the cells. The module fixing and fastening section is provided at a position on an extension line extending from the intermediate partition section.

  According to the above configuration, even if the intermediate partition section expands or contracts due to the heat of the unit cell, the expansion and contraction is suppressed by the module fixing and fastening section. In this case, the module fixing and fastening portion can be provided with the function of protecting the temperature sensor and the function of suppressing the deformation of the battery housing member.

  According to a seventh means, in the battery module, the battery housing member has an opening (64) into which the unit cell is inserted, and the cover member (53) is attached to the opening. The fastening part is a cover fixing fastening part (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 part. ..

  Even if it is a cover fixing fastening portion for fixing the cover member, the same effect as described above can be obtained as long as the fastening portion is formed to project on the outer surface portion of the battery housing member. That is, even if the peripheral wall portion is deformed or is likely to be deformed by an external force, the cover fixing and fastening portion on the inside thereof suppresses the deformation of the peripheral wall portion. Thereby, the temperature sensor can be preferably protected.

  In the eighth means, in the outer surface portion of the battery accommodating member, the protrusion dimension of the temperature sensor toward the peripheral wall portion is smaller than the protrusion dimension of the fastening portion.

  Since the protruding dimension of the temperature sensor toward the side of the peripheral wall is smaller than the protruding dimension of the fastening portion, the distance between the peripheral wall and the temperature sensor can be increased, and a suitable configuration for protecting the temperature sensor can be provided. 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 envisioned that the portion of the unit cell where the electrode is provided is provided with a structural portion such as an insulating portion or a bus bar. Further, it is assumed that the site where the electrode is provided is located near the center of the unit apart from the peripheral wall. On the other hand, it is assumed that the portion of the outer surface of the battery housing member on the side where the electrode of the single cell is not provided is close to the peripheral wall portion and the structural portion is not provided. In this respect, the fastening portion is provided on the outer surface of the battery housing member on the side where the electrode of the unit cell is not provided, and the temperature sensor is provided in the vicinity of the fastening portion. It can be suitably protected.

  In a tenth means, the battery accommodating member has the unit cells stacked in three or more stages in a direction orthogonal to the bottom portion, and each of the battery accommodating members has a stack of three or more stages. The temperature sensor is attached at a position corresponding to an intermediate unit cell among the unit cells.

  When the cells are stacked in three or more layers, there is a concern that the cells in the middle stage among them may become particularly hot. In this respect, since the temperature sensor is attached at a position corresponding to the intermediate unit cell, the temperature of the unit cell can be properly managed.

The perspective view which shows the whole battery unit structure. 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 a battery unit. Top view of the 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. 3 is a schematic view showing 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 a 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 the battery module with respect to the base. The top view which shows the state which assembled the battery module with respect to the base. FIG. 6 is a vertical cross-sectional view at a position passing through a joint portion of the intermediate structure portion. FIG. 5 is a vertical cross-sectional view at a position passing through the insertion hole of the intermediate structure portion. The top view which shows arrangement | positioning of each cell and each fixed part. The figure which shows the heat dissipation state of a battery module. 7 is a schematic view showing a base and a battery case in another example. 7 is a schematic view showing a base and a battery case in another example. 7 is a schematic view showing a base and a battery case in another example. 7 is a schematic view showing a base and a battery case in another example.

  An embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, it is assumed that the present invention is embodied in a power supply system mounted on a vehicle, and this power supply system charges or discharges a power storage unit (power supply unit) for supplying power to various in-vehicle electric loads. Are controlled sequentially. BACKGROUND ART A vehicle has an engine that is an internal combustion engine, an on-vehicle ECU that controls the engine and other parts, a power generation function that is driven by rotation of the engine and axles to generate electricity, and a power running function that rotates the engine and axles. ), A power storage unit charged by the electric power generated by the rotating electric 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 this 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 charging and discharging in the battery module 11, and a plate 13 provided along the upper surface of the battery module 11. And terminal modules 14 and 15 for inputting and outputting electric power, and a housing case 16 for housing these battery modules 11 and the like. The housing case 16 has a substantially rectangular parallelepiped shape, and includes a base 17 fixed to a mounting location of the battery unit 10 and a cover 18 mounted above the base 17. The base 17 and the cover 18 are each made of a metal material such as aluminum or a synthetic resin material.

  The battery module 11, the control board 12 and the plate 13 are vertically arranged such that the plate 13 is located on the battery module 11 and the control board 12 is located on the battery module 11, respectively. It is fixed by a fastening member N such as a bolt. More specifically, as shown in FIGS. 3 and 4, in the battery module 11, the upper surface is formed in a stepped shape according to the battery stacking state, and the stepped plate 13 is attached along the stepped surface of the battery module 11. Has been. The plate 13 is a deformation suppressing plate for suppressing deformation that occurs 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 stage portion of the plate 13 are substantially at the same position. By assembling the cover 18 from above to the base 17, the battery module 11, the control board 12, and the like are accommodated in the accommodation case 16.

  The terminal modules 14 and 15 have output terminals respectively connected to a lead storage battery, a rotary electric machine, and an electric load. 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 a rotating electric machine. These output terminals 21 and 22 are integrally provided on a terminal block 23 made of an insulating material, and each of the terminals 21 and 22 is connected to a bus bar 24 that forms a power path. The terminal module 15 also has an output terminal 25 connected to an electric load. The output terminal 25 is provided on the terminal block 26, and the bus bar 27 is connected thereto. The terminal modules 14 and 15 are fixed to the base 17.

  Next, the characteristic configuration of the battery unit 10 in this 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 has 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 quadrangular 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, and 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 one in which the unit cells 51 are arranged in a line along the bottom plate portion 31, and the base 17 (the housing case 16) is arranged in a line. The configuration is such that the direction is the longitudinal direction and the direction orthogonal thereto is the lateral 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 project 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 at predetermined height positions. Has become.

  Among them, the module fixing portions 33 for fixing the battery module 11 are provided at three positions, that is, both end positions which are both ends along one side (longitudinal direction in the present embodiment) of the bottom plate portion 31 and an intermediate position therebetween. There is. More specifically, two module fixing parts 33 are provided on each of both ends of the bottom plate 31, and one module fixing part 33 is provided at an intermediate position. Similarly, plate fixing portions 34 for fixing the plate 13 are also provided along the one side of the bottom plate portion at three positions of both end positions and an intermediate position. Substrate fixing parts 35 for fixing the control substrate 12 are provided at two positions, one end position and an intermediate position of the bottom plate part. The number of fixing parts 33 to 35 at each position is arbitrary.

  An upper end surface of each of the fixing portions 33 to 35 is a flat surface extending in the same direction as the bottom surface of the bottom plate portion 31, and a screw hole is formed in each of the upper ends of the fixing portions 33 to 35. The fixed portions of the battery module 11, the control board 12, and the plate 13 are brought into contact with the upper end surfaces of the respective fixed portions 33 to 35, and in this state, these respective members are fixed by the fastening member N. It is supposed to be done. As another fastening method, an anchor bolt extending upward from the upper end surface is provided on 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, each of the fixing portions 33 to 35 is arranged at three positions in the longitudinal direction of the base 17 (battery arranging direction). That is, each of the fixing portions 33 to 35 is arranged in each of the end regions A1 and A2 in the longitudinal direction of the base 17 and the intermediate region A3 therebetween. In each of these areas A1 to A3, the fixing portions belonging to each area are integrally provided so that at least some of them are continuously connected. The module fixing portion 33, the plate fixing portion 34, and the substrate fixing portion 35 are provided in the one end area A1 and the intermediate area A3, and the module fixing portion 33 and the plate fixing portion 34 are provided in the other end area A2. And are provided. In the following description, for the sake of convenience, the fixing portions 33 to 35 belonging to the end area A1 are collectively referred to as a “fixing portion X1”, and the fixing portions 33 and 34 belonging to the end area A2 are collectively referred to as a “fixing portion X2”, an intermediate area. The fixed parts 33 to 35 belonging to A3 are collectively referred to as "fixed part X3".

  In the fixing portion X1, the fixing portions 33 to 35 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. Further, in the fixing portion X2, 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.

  In addition, the battery module 11 has a portion for stacking two batteries and a portion for stacking three batteries, and in comparison with these portions, the end area A1 is provided on the side of stacking two batteries, The area A2 is provided on the side where the batteries are stacked in three layers.

  The height of each of the fixing portions 33 to 35 from the bottom plate portion 31, that is, the height position of the upper end with respect to the bottom plate portion 31, is determined for each. 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 located at a position lower than the peripheral wall portion 32. Further, part of the plate fixing part 34 has substantially the same height as the upper end of the peripheral wall part 32, and the other part is lower than it in accordance with the step of the plate 13. Therefore, a part of the fixing point for fixing the plate 13 is at the same position as the peripheral wall portion 32, and the other is at a position lower than the peripheral wall portion 32. The board fixing portion 35 has substantially the same height as the upper end of the peripheral wall portion 32. Therefore, the fixing point for fixing the control board 12 is at the same position as the peripheral wall portion 32.

  When the module fixing portion 33 is particularly described, the heights of the two module fixing portions 33 are the same in the end region A1. Further, in the end area A2, the heights of the two module fixing portions 33 are different.

  Further, the base 17 is provided with an element pedestal portion 37 to which a semiconductor power element 36 (see FIG. 2) for power control is attached. The element pedestal portion 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 pedestal portion 37 is provided at a position adjacent to the battery module 11. The element pedestal portion 37 is a heat radiation portion that radiates the heat generated in the power element 36 to the outside, and a heat radiation rib is provided below (on the back side of) the heat radiation portion. In this case, the heat generated in the power element 36 is transmitted to the element pedestal portion 37 and further radiated to the outside of the unit.

  As shown in FIG. 3, the cover 18 has 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 such that the peripheral wall portion 32 of the base 17 is on the inside of the case and the hanging wall portion 42 of the cover 18 is on the outside of the case.

  Next, the battery module 11 will be described.

  As shown in FIG. 7, the battery module 11 is roughly classified into a plurality (five in the present embodiment) of single cells 51, a battery case 52 accommodating these single cells 51, and an insulating assembly to the battery case 52. A cover 53 and an exhaust duct 54 that is provided so as to overlap the insulating cover 53 are provided on the side opposite to the battery of the insulating cover 53. Of these, a plurality of unit cells 51, a battery case 52 accommodating them in a stacked state, and an insulating cover 53 constitute a battery main body Y, and the battery main body Y is shown in FIG.

  Each of the five unit cells 51 is a thin rectangular parallelepiped lithium ion storage battery. As shown in FIG. 7, each unit cell 51 has positive and negative terminals 56 on one side surface thereof, 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 abnormal pressure, and is formed by closing a hole opened on the end face of the outer case of the unit cell 51 with a thin metal film, for example. Has been done. When the internal pressure of the unit cell 51 becomes abnormal, the metal film of the exhaust valve 57 is broken, so that the gas inside the cell is released to the outside of the cell. This reduces the cell internal pressure and suppresses the bursting of the unit cell itself.

  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, a synthetic resin material having an insulating property. 9 and 10 are perspective views of the battery case 52 viewed from different directions.

  As shown in FIGS. 9 and 10, the battery case 52 has an outer peripheral portion 61 surrounding the periphery and a plurality of partition portions 62 provided between the unit cells 51 stacked vertically. 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 portion 63 has an opening on one surface side of the case side portion, and the unit cell 51 is inserted through the opening 64. In this embodiment, the five unit cells 51 are divided into a two-tiered battery group and a three-tiered battery group, and are arranged side by side, that is, in the direction along the bottom plate portion 31 of the base 17. The five battery accommodating portions 63 are divided into a two-tier stacking portion and a three-tier stacking portion, and are provided side by side.

  The outer peripheral portion 61 includes a lower plate portion 61 a which is a 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 which is an upper surface portion of the battery module 11. In the present embodiment, the five unit cells 51 are arranged separately in the two-tier stacked battery group and the three-tier stacked battery group, and the upper surface portion (upper plate portion 61b) of the outer peripheral portion 61 has the single cells. A step corresponding to the thickness of one battery is formed.

  Each unit cell 51 has a pair of maximum surfaces whose thickness dimension in the stacking direction is smaller than the width dimension in the direction orthogonal to the stacking direction and whose area is maximum on the battery outer peripheral surface. In the battery case 52, one of the maximum surfaces of the pair of the single cells 51 (the lower side surface in the figure) is the bottom plate portion 31 side, and the other (the upper side surface in the figure) is the opposite side of the bottom plate portion 31. It is housed so as to be stacked. That is, in the present embodiment, the plate-shaped unit cells 51 are laid down to be in a horizontal direction and are arranged side by side in that state. In addition, each of the unit cells 51 has a rectangular shape in a plan view and is arranged so as to be aligned in the longitudinal direction. That is, in the unit cell 51, the surface of the outer peripheral surface of the battery having the largest area has a rectangular shape, and the long side portion and the short side portion of the surface are arranged so that the short side portions face each other. It is arranged.

  The battery case 52 has projecting portions 65 (65A, 65B) projecting from the outer surface on both end portions in the longitudinal direction thereof. The projecting portion 65 is a fastening portion where fastening by the fastening member N is performed, and is particularly a portion corresponding 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 portion 33 of the base 17 by fastening members N, respectively. No fastening portion is provided on the back side of the battery case 52 (the side opposite to the opening 64). The protruding portion 65 is provided on the outer surface of the battery case 52 on a side where the terminals 56 of the unit cell 51 are not provided. The protruding portion 65 has a through hole penetrating in the vertical direction, and a cylindrical metal collar 66 is incorporated as a reinforcing member in the through hole.

  Among the protrusions 65 at both ends in the longitudinal direction of the battery case 52, the protrusions 65A provided on the side of the two-tiered battery stack have the same height position (see FIG. 10). The height positions of the protrusions 65B provided on the side of the three-tiered battery stack are different from each other (see FIG. 9). In comparison with the configuration of the base 17 (see FIGS. 5 and 6), the projecting portion 65A on the side of the two-tiered battery is fixed to the module fixing portion 33 in the end area A1 of the base 17, and the three-tiered battery is stacked. The projecting portion 65B on the side of 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 portion 62 for partitioning the battery accommodating portions 63 in the battery stacking direction, and the projecting portions 65 are provided at the positions on the outer surface of the case on the extension line of the partition portion 62. ing. In this case, two projecting portions 65A are provided on the side of the two-tiered stacking side of the battery, which is on the extension line of the partition 62 between the two upper and lower tier battery accommodating portions 63. Further, on the side of the three-tiered stacking of batteries, one projecting portion 65B is provided at a position on the extension line of each of the two partitioning portions 62 between the upper and lower three-tiered battery accommodating portions 63. That is, the projecting portions 65B are distributed and arranged in the two partition portions 62. At this time, the projecting portions 65B are respectively provided on the extension lines of the partition portions 62 on both sides of the unit cell 51 in the middle stage. Note that FIG. 11 shows a state in which the projecting portions 65A and 65B are fixed on the module fixing portion 33.

  Each of the projecting portions 65 is formed on the outer surface of the battery case 52 and is a fastening portion to which the fastening member N such as a screw or a bolt is fastened, and thus has a higher strength than other portions. 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 partition part 62 expands and contracts due to the high temperature generated by the heat generation of the unit cell 51. However, at the position on the extension line of the partition part 62, the protruding part 65 serving as a high-strength part is formed. Since the partition 62 is provided, expansion and contraction of the partition 62 is suppressed.

  Further, in the battery case 52, flanges 69 are formed around the opening 64 so as to project from the outer surface of the case and extend to the outside at both ends in the longitudinal direction. Fastening portions 70 for attaching the insulating cover 53 by fastening the fastening members N are provided at upper and lower portions of each of the flanges 69. 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 mounting direction, and a cylindrical metal collar 71 is incorporated as a reinforcing member in the through hole. A female screw is preferably formed on the collar 71.

  Further, as shown in FIGS. 8 and 9, the battery case 52 is provided with an opening portion 73 at one side end portion in the longitudinal direction thereof, and the opening portion 73 serves as a sensor attachment portion of the unit cell 51. A temperature sensor 74 for detecting the temperature is attached. The opening 73 is on the side of stacking three batteries out of the side of stacking two batteries and the side of stacking three batteries, and corresponds to the middle unit cell 51 which is the middle stage of the unit cells 51 of the upper and lower three stages. It is provided at the position where In addition, the opening 73 is provided at a position close to the protrusion 65B, particularly in a position between the two protrusions 65B in the present embodiment. Therefore, since the protruding portion 65B is provided so as to protrude to the outer surface of the battery case 52, the temperature sensor 74 is attached at a position recessed from the position on the protruding tip side of the protruding portion 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 attached 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 urges the element portion 75 toward the unit cell 51 side and presses it against the outer surface of the unit cell 51. A terminal portion 77 is attached to each element portion 75, and a harness H is connected to the terminal portion 77 (see FIG. 8).

  When the temperature sensor 74 is attached to the battery case 52, two element parts 75 are provided for the same single battery 51 in the stacking direction of the single batteries 51 (also in the battery thickness direction).

  FIG. 13 is a schematic view showing the mounting position of the temperature sensor 74 in the battery case 52. FIG. 13A is a side view of the battery case 52 seen 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 the 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 protrusion 65B as long as it is located between the two protrusions 65B in the lateral direction (the surface direction of the bottom plate portion 31 of the base 17). The position may be.

  Further, as shown in FIG. 13B, in a state where 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 protruding portion 65B is located inside the portion 32. In this case, as described above, the protruding portion 65B is a high-strength portion. Therefore, if the protruding portion 65B is located inside the peripheral wall portion 32, even if the peripheral wall portion 32 is pressed by an external force and is deformed or is likely to be deformed, the protruding portion 65B inside the peripheral wall portion 32 causes The deformation of the peripheral wall portion 32 is suppressed. Therefore, it is possible to prevent the temperature sensor 74 from being hindered by an external force. In FIG. 13B, the protruding dimension of the temperature sensor 74 toward the peripheral wall portion 32 side is smaller than the protruding dimension of the protruding portion 65B.

  In a plan view of the battery module 11, the battery case 52 has a plurality of side portions that are oriented to intersect with each other, and one of the side portions has a plurality of protruding portions 65B in the lateral direction of the peripheral wall portion 32. It is provided. Then, the 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 unit cell 51 is housed 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 the fastening members N at the fastening portions 70 and 91.

  The insulating cover 53 is provided with a plurality (10 in the present embodiment) of opening portions 92 into which the terminals 56 of the individual cells 51 are inserted, and the insulating cover 53 is provided so as to close the opening portions 92. A plurality of bus bars 93 are each attached. The unit cells 51 are connected in series with each other by these bus bars 93. Further, the insulating cover 53 is provided with five openings 94 corresponding to the positions of the exhaust valves 57 of the individual 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 in which the unit cells 51 are stacked in two layers (a two-layer stacked portion in the battery housing portion 63) and a portion in which the single cells 51 are stacked in three layers (a three-layer stacked portion in the battery housing portion 63) The intermediate structure portion 81 provided between the (part) and the (part) will be described. 14 is a plan view of the battery case 52, and FIG. 15 is a vertical sectional view of the battery case 52. 15 is a sectional view taken along line 15-15 of FIG.

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

  The intermediate structure portion 81 is provided with a coupling portion 83 that is coupled to the tip 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 the state where the battery module 11 is assembled to the base 17, the tip end of the module fixing portion 33 in the intermediate region A3 and the coupling portion 83 come into contact with each other, and the fastening by the fastening member N is performed in that state. As a result, 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 for inserting the plate fixing portion 34 and the substrate fixing portion 35 of the intermediate area A3, respectively. These insertion holes 85 and 86 are provided one on each side of the coupling portion 83.

  In the intermediate area 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 the 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 and 86, and their tip ends are exposed above the battery case 52. (See FIG. 16). The tip 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 portion 34 and the substrate fixing portion 35.

  As another configuration in FIG. 7, the exhaust duct 54 has a recovery space part for recovering the gas and the electrolytic solution 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 for the assembled battery in which the five unit cells 51 are connected in series.

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

  As shown in FIGS. 18 and 19, in the 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 at both ends in the longitudinal direction, The fixing portion X3 of the intermediate area A3 is located at the intermediate portion in the longitudinal direction. In this case, when viewed in the longitudinal direction of the battery module 11, each fixing portion X1 to X3 is provided as a heat radiating portion at each end of each unit cell 51 sandwiching each unit cell 51, and each unit cell 51 is provided via each fixing section X1 to X3. It is possible to release the heat of.

  To describe the fixing portion X3 of the intermediate region A3 in particular, in the module fixing portion 33, the heat of each unit cell 51 (heat of the battery module 11) is directly transmitted via the coupling portion 83 of the intermediate structure portion 81, and In the space Z of the recess 82, heat is transferred from each of the adjacent unit cells 51. Further, in the plate fixing portion 34 and the substrate fixing portion 35, heat is transferred from each of the adjacent unit cells 51 in the space Z of the intermediate recess 82. Therefore, even in the central position where the battery heat easily accumulates in the battery module 11, suitable heat dissipation is possible. The fixed portion X3 of the intermediate area A3 corresponds to the "intermediate heat dissipation portion". The fixed portions X1 and X2 of the end regions A1 and A2 correspond to “side heat radiation portions”.

  Here, each unit cell 51 and each fixed portion X1 to X3 may have the following positional relationship. FIG. 20 is a plan view showing the arrangement of the unit cells 51 and the fixing units X1 to X3. In the figure, the * marks indicate the central positions of the unit cells 51 and the fixing units X1 to X3. In FIG. 20, the distance from the center of the unit cell 51 to the intermediate fixing 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 the direction orthogonal to the battery arrangement direction in the plan view (the vertical direction in the drawing) is preferably located at a position overlapping the side surface range of the unit cell 51, but This does not apply as long as the side surface and the fixed portions X1 to X3 as the heat radiation portion face each other.

  Considering that the plate 13 is assembled above the battery module 11, the battery module 11 radiates heat as shown in FIG. In this case, at both ends 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. At the intermediate position of the battery module 11, heat is radiated from the upper and lower surfaces, which are the maximum surfaces of the individual cells 51, and also heat is radiated to the bottom plate portion 31 and the plate 13 via the fixing portion X3 in the central portion. Done.

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

  Inside the peripheral wall portion 32 of the housing case 16, a protruding portion 65B serving as a fastening portion to be fastened by the fastening member N is arranged, and the temperature sensor 74 is attached to a position aligned with the protruding portion 65B 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 protrusion 65B inside the peripheral wall portion 32 suppresses the deformation of the peripheral wall portion 32. That is, the deformation or the like of the peripheral wall portion 32 on the front side of the temperature sensor 74 is suppressed. Therefore, it is possible to prevent the temperature sensor 74 attached to the outer surface of the battery case 52 from being hindered by an external force. As described above, the temperature sensor 74 can be preferably protected in the battery module 11.

  Since the housing case 16 is composed of the base 17 and the cover 18, and the temperature sensor 74 is housed in the housing case 16 integrally with the battery module 11, the temperature sensor 74 is properly installed regardless of the direction of the external force. Can be protected. Since the protection performance of the temperature sensor 74 is improved, temperature measurement accuracy and temperature measurement reliability can be ensured.

  By the way, depending on the mounting position of the battery unit 10 in the vehicle, a large external force may be applied to the battery unit 10 due to a vehicle collision or a leg kick of an occupant. The sensor 74 can be properly protected.

  Since the obstacle due to the deformation of the peripheral wall portion 32 can be avoided, the temperature sensor 74 can be arranged near the peripheral wall portion 32, and the dead space near the peripheral wall portion 32 can be effectively used.

  The projecting portion 65B as the module fixing and 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, by setting the position of the projecting portion 65B higher than the bottom plate portion 31, a protective space for protecting the temperature sensor 74 is preferably provided between the peripheral wall portion 32 and the battery case 52. You can 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 to the vicinity of the upper end portion of the peripheral wall portion 32, it is possible to suppress the influence on the temperature sensor 74.

  The module fixing portion 33 extends from the bottom plate portion 31 of the base 17 and is integrally provided on the peripheral wall portion 32. Therefore, the strength of the fixing portion itself is increased, and by extension, the strength of the projecting 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 of the protrusion 65B, the temperature sensor 74 is arranged in the region from the protrusion 65B to the bottom plate portion 31 when viewed in the height direction. Therefore, it is possible to further optimize the protection of the temperature sensor 74.

  The temperature sensor 74 is attached to the side of the battery case 52 at a position between the plurality of protrusions 65B. As a result, a protective space for protecting the temperature sensor 74 can be further strengthened between the peripheral wall portion 32 and the battery case 52.

  The protruding portion 65B is provided on the outer surface of the battery case 52 at a position on the extension line of the partition portion 62. Accordingly, even if the partition portion 62 expands and contracts due to the heat of the unit cell 51, the expansion and contraction is suppressed by the protruding portion 65B. In this case, the protrusion 65B can be provided with the function of protecting the temperature sensor 74 and the function of suppressing the deformation of the battery case 52.

  The protruding size of the temperature sensor 74 toward the peripheral wall 32 is smaller than the protruding size of the protruding portion 65B. As a result, the distance between the peripheral wall portion 32 and the temperature sensor 74 can be increased, and a structure suitable for protecting the temperature sensor 74 can be realized.

  It is assumed that the portion of the unit cell 51 where the terminal 56 (electrode) is provided is provided with a structural portion such as an insulating portion or a bus bar. Further, it is assumed that the portion where the terminal 56 is provided is arranged at a portion near the center of the unit, which is separated from the peripheral wall portion 32. On the other hand, it is assumed that the portion of the outer surface of the battery case 52 on the side where the terminals 56 of the unit cell 51 are not provided is close to the peripheral wall portion 32 and that no structural portion is provided. In this regard, since the protruding portion 65 (fastening portion) is provided at a portion of the outer surface of the battery case 52 where the terminal 56 of the unit cell 51 is not provided, and the temperature sensor 74 is provided near the protruding portion 65, the peripheral wall portion is provided. The temperature sensor 74 can be suitably protected when an external force is exerted on 32.

  When the unit cells 51 are stacked in three or more stages, there is a concern that the unit cells 51 in the middle stage among them may reach a particularly high temperature. In this respect, since the temperature sensor 74 is attached at a position corresponding to the unit cell 51 in the middle stage, the temperature of the unit cell 51 can be properly managed.

  The temperature sensor 74 is provided with two element parts 75, and the element parts 75 detect the same temperature of the single battery 51. As a result, the reliability of temperature detection can be improved even if an abnormality occurs in the element unit 75.

  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. In this respect, according to the above configuration, since the fixing portion X3 is provided as the intermediate heat radiation portion at the intermediate position of each unit cell 51, the heat radiation performance can be improved. As a result, the heat dissipation of the unit cell 51 can be suitably performed.

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

  In the battery case 52, an intermediate structure 81 is provided at a position between a plurality of battery accommodating parts 63 arranged side by side, and a fixing part X3 (intermediate heat dissipation part) is provided so as to enter the intermediate recess 82 of the intermediate structure. And In this case, it is possible to preferably receive the heat of each unit cell 51 at the fixing portion X3 (intermediate heat dissipation unit) while suppressing the influence of the heat of the unit cells adjacent to each other.

  The intermediate structure portion 81 is provided with a coupling portion 83 coupled to the tip 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, by arranging the plurality of unit cells 51 side by side, the battery case 52 can be firmly fixed at the intermediate position even when the length dimension of the battery case 52 becomes large. Thereby, the battery module 11 can be stably held in the housing case 16.

  Further, the coupling portion 83 has a heat transfer function of directly transferring heat from the unit cell 51 side to the base 17 side, and can realize good heat dissipation performance. Assuming that the coupling portion 83 is coupled to the module fixing portion 33 by using a fastening member N such as a screw or a bolt, heat is transferred by the fastening member N, and thus heat radiation through the coupling portion 83 is performed. It is thought that it will be possible to improve the sex.

  The control board 12 is arranged on the side opposite to the bottom plate portion 31 with the battery module 11 interposed therebetween, and the board fixing portion 35 is included in the fixing portion X3. In this case, the substrate fixing part 35 can be provided with a function as an intermediate heat dissipation part. Further, when heat generation of the electric components mounted on the control board 12 is assumed, the heat on the control board 12 side can be released through the fixing portion X3 (intermediate heat dissipation portion).

  The plate 13 is arranged on the side opposite to 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 provided with a function as an intermediate heat radiating portion.

  Since the intermediate structure portion 81 is provided with the coupling portion 83 to be coupled to the module fixing portion 33 and the insertion holes 85 and 86 for inserting the plate fixing portion 34 and the substrate fixing portion 35, the heat from the unit cell 51 is removed. It is possible to realize a more suitable configuration for the escape.

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

  In the configuration in which the battery module 11 is fixed to the base 17 by the fixing portion X3 which is the intermediate heat radiating portion and the fixing portions X1 and X2 which are the lateral heat radiating portions, the fixing points of the battery module 11 are concentrated at the positions in the battery arranging direction. be able to. Therefore, it is possible to eliminate the fixing point on the side orthogonal to the battery arrangement direction, and it is possible to realize an advantageous configuration for downsizing the battery unit 10.

  In the battery module 11, the unit cells 51 having a rectangular shape in plan view are arranged side by side in the longitudinal direction. That is, the short sides of the individual cells 51 are adjacent to each other. As a result, it is possible to prevent the battery unit 10 from increasing in size due to dead space while securing a space for the fixing portion X3 as an intermediate heat dissipation portion at an intermediate position in the longitudinal direction of the battery case 52.

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

  The outer surface of the battery case 52 is provided with the protruding portion 65 as a fastening portion at a position on the extension line of the partition portion 62. Therefore, even if the partition portion 62 expands and contracts due to the temperature change of the unit cell 51, the expansion and contraction is suppressed by the protrusion 65. Further, in particular, since the protruding portion 65B is provided at a position on the extension line of the partition 62 while corresponding to the unit cell 51 in the middle stage among the plurality of unit cells 51 stacked in three stages, the unit cell 51 in the middle stage is provided. Then, the expansion and contraction (expansion and contraction) of the partition portion 62 can be appropriately suppressed, taking into consideration that the influence of heat is particularly concerned. Thereby, the stress generated in the battery case 52 is reduced, and the battery case 52 and the battery module 11 can be properly protected.

  In the battery case 52, the projecting portions 65 (fastening portions) are respectively provided on the extension lines of the two partition portions 62 on the side where three layers are stacked. In this case, since the projecting portions 65 are arranged in a distributed manner with respect to the partition portions 62, it is possible to obtain the effect of suppressing the expansion and contraction of the battery case 52 as a whole due to temperature changes.

  The protruding portions 65 are provided on the extension lines of the partition portions 62 on both sides with the unit cell 51 in the middle stage sandwiched therebetween. In this case, it is possible to provide a more appropriate expansion / contraction suppressing function around the intermediate 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 projecting portion 65 fixed to the module fixing portion 33 can be increased and the partition portion A more appropriate configuration can be realized in suppressing the expansion and contraction of 62.

(Other embodiments)
The above embodiment may be modified as follows, for example.

  In the battery case 52, the protrusion 65 (module fixing and fastening portion) and the temperature sensor 74 may be arranged as shown in FIG. In FIG. 22, one protrusion 65 is provided on each side of the battery case 52. The temperature sensor 74 is arranged on one side of the protrusions 65 side by side. The position and number of the protruding portions 65 on the side portion 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 31 side of the base 17 with respect to the protrusion 65. The temperature sensors 74 may be provided on the two sides of the battery case 52, respectively.

  In the battery case 52, the projecting portion 65 (module fixing and fastening portion) may be provided so as to straddle two or more partition portions 62 that are adjacent to each other in the stacking direction of the unit cells 51. In FIG. 23, the projecting portion 65C is provided on the side of the unit cells 51 stacked in three stages so as to reach both of the two partition portions 62. Regarding the relationship between the protruding portion 65C and the temperature sensor 74, it is preferable that the temperature sensor 74 be provided at a position where the protruding portion 65C is arranged side by side.

  According to this configuration, the projecting portion 65C can collectively impart the function of suppressing expansion and contraction of the two or more partition portions 62, and the increase in the size of the projecting portion 65C can enhance the function of suppressing expansion and contraction. it can. Further, 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.

  It is also possible to stack the unit cells 51 in four or more layers in the battery case 52. FIG. 24 shows the 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 accommodating portions 63 are provided in the vertical direction with respect to the bottom plate portion 31 of the base 17, and the battery accommodating portions 63 are separated from each other by three partition portions 62. In each of (a) and (b), the projecting portion 65 is arranged on an extension line of two or more different partition portions 62. Note that a combination with the configuration of FIG. 23 is also possible, and any one of the protruding portions 65 may have a length that extends over two or more partition portions 62.

  A flange 69 is provided on the battery case 52 so as to project laterally, and a fastening portion 70 (cover fixing fastening portion) is provided on the flange 69 (see FIGS. 9 and 10). In this case, in terms of the relationship between the fastening portion 70 and the temperature sensor 74, similar to the relationship between the protruding portion 65B of the battery case 52 and the temperature sensor 74, the position on the protruding tip side of the fastening portion 70 (the protruding tip of the flange 69). The temperature sensor 74 is attached to a position recessed from the side position). In this case, the fastening portion 70 is a high-strength portion like the projecting portion 65B, and if the fastening portion 70 is located inside the peripheral wall portion 32, the peripheral wall portion 32 is pressed by an external force and is deformed. Even if it occurs or is likely to be deformed, the fastening portion 70 inside thereof suppresses the deformation of the peripheral wall portion 32. Therefore, it is possible to prevent the temperature sensor 74 from being hindered by an external force.

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

  -The structure of the heat radiation part in the battery unit 10 may be changed as follows. For example, as shown in FIG. 25, heat radiating members 101 and 102 as side heat radiating portions are provided on both sides of each of the unit cells 51 arranged side by side, and a heat radiating member 103 as an intermediate heat radiating portion is provided at an intermediate position of each cell 51. Is provided. In this case, the heat dissipation member 103 is composed of a plurality of members that are individually provided on the bottom plate portion 31. The heat dissipation members 101 to 103 do not have to have a fixing function of fixing the battery module 11 and the like, respectively.

  The protrusion 65 may be provided at a position on the extension line of the partition 62 in the battery case 52, 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 having a rectangular shape in a plan view are arranged side by side in the longitudinal direction, but this may be changed and the unit cells 51 may be arranged side by side in the lateral direction. Good. Further, the unit cell 51 may have a square shape in a plan view. Further, in the battery module 11, instead of the configuration in which the plurality of unit cells 51 are stacked side by side on the bottom plate portion 31 of the base 17, the plurality of unit cells 51 may be arranged in the vertical direction and overlap each other. .

  -Instead of using the lithium-ion storage battery as the unit cell, another secondary battery such as a nickel-cadmium storage battery or a nickel-hydrogen storage battery may be used as the unit cell. The battery unit 10 can also be used for purposes other than the vehicle.

  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 part (sensor mounting part), 74 ... Temperature sensor, N ... Fastening member.

Claims (10)

A battery module (11) in which a plurality of cells (51) are housed in a battery housing member (52);
An accommodating case (16) having a bottom part (31) and a peripheral wall part (32) and accommodating the battery module in a space surrounded by the bottom part and the peripheral wall part;
A temperature sensor (74) for detecting the temperature of the unit cell;
A battery unit (10) comprising:
The battery accommodating member is provided with a module fixing fastening part (65) for fixing the battery module to the accommodating case, as a fastening part which is provided so as to project on the outer surface part and is fastened by the fastening member (N). ,
A side surface of the battery housing member faces the peripheral wall portion, and the module fixing fastening portion is located inside the case of the peripheral wall portion,
The module fixing and 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,
Parallel beauty, and the sensor mounting portion at a position than the opposite end serving as the bottom portion closer to the said bottom of the module fixing fastening portion (73) is provided in the module fixing fastening portion at the outer surface of the battery accommodating member A battery unit in which the temperature sensor is attached to the sensor attachment portion. The battery unit according to claim 1 , wherein the module fixing portion extends from the bottom portion and is integrally provided on the peripheral wall portion. The battery accommodating member has , as the outer surface part, a plurality of accommodating member side surface parts extending in a direction intersecting with the bottom part and intersecting with each other , and at least one of them is provided in a lateral direction of the peripheral wall part. A plurality of module fixing fastening portions are provided,
Battery unit according to position between the plurality of the modules fixed fastening part, to claim 1 or 2 wherein the temperature sensor is attached. A battery module (11) in which a plurality of cells (51) are housed in a battery housing member (52);
An accommodating case (16) having a bottom part (31) and a peripheral wall part (32) and accommodating the battery module in a space surrounded by the bottom part and the peripheral wall part;
A temperature sensor (74) for detecting the temperature of the unit cell;
A battery unit (10) comprising:
The battery housing member ,
A module fixing fastening portion (65) for fixing the battery module to the housing case is provided as a fastening portion that is provided so as to project on the outer surface portion and is fastened by a fastening member (N), while the outer surface portion serves as the outer surface portion. A plurality of housing member side surfaces extending in a direction intersecting with the bottom portion and intersecting with each other, at least one of which is provided with a plurality of the module fixing fastening portions in the lateral direction of the peripheral wall portion. And
A side surface of the battery housing member faces the peripheral wall portion, and the module fixing 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 between the plurality of module fixing and fastening portions on an outer surface portion of the battery housing member, and the temperature sensor is attached to the sensor attachment portion. The battery accommodating member is for accommodating the cells in a stacked state, and has an intermediate partition part (62) for partitioning a battery accommodating part (63) for each of the cells.
The module fixing fastening unit, battery unit according to any one of claims 1 to 4 are provided at positions which are on the extension of the intermediate partition portion extends. A battery module (11) in which a plurality of cells (51) are housed in a battery housing member (52);
An accommodating case (16) having a bottom part (31) and a peripheral wall part (32) and accommodating the battery module in a space surrounded by the bottom part and the peripheral wall part;
A temperature sensor (74) for detecting the temperature of the unit cell;
A battery unit (10) comprising:
The battery housing member ,
A module fixing fastening portion (65) for fixing the battery module to the housing case is provided as a fastening portion that is provided so as to project on the outer surface portion and is fastened by the fastening member (N). It is to be housed in a laminated state, and has an intermediate partition part (62) for partitioning the battery housing part (63) for each of the unit cells,
A side surface of the battery housing member faces the peripheral wall portion ,
The module fixing fastening portion is provided inside the case of the peripheral wall portion, and is provided at a position on an extension line where the intermediate partition portion extends,
A battery unit in which a sensor attachment portion (73) is provided at a position aligned with the module fixing and fastening portion on the outer surface portion of the battery housing member, and the temperature sensor is attached to the sensor attachment portion. A battery module (11) in which a plurality of cells (51) are housed in a battery housing member (52);
An accommodating case (16) having a bottom part (31) and a peripheral wall part (32) and accommodating the battery module in a space surrounded by the bottom part and the peripheral wall part;
A temperature sensor (74) for detecting the temperature of the unit cell;
A battery unit (10) comprising:
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.
The battery accommodating member is a cover fixing and fastening part for fixing the cover member to the battery accommodating member in the battery module, as a fastening part that is provided so as to project on the outer surface of the battery accommodating member and is fastened by the fastening member (N). Equipped with (70) ,
A side surface of the battery housing member faces the peripheral wall portion, and the cover fixing 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 cover fixing and fastening portion on the outer surface portion of the battery housing member, and the temperature sensor is attached to the sensor attachment portion. A battery module (11) in which a plurality of cells (51) are housed in a battery housing member (52);
An accommodating case (16) having a bottom part (31) and a peripheral wall part (32) and accommodating the battery module in a space surrounded by the bottom part and the peripheral wall part;
A temperature sensor (74) for detecting the temperature of the unit cell;
A battery unit (10) comprising:
The battery accommodating member is provided with a fastening portion (65, 70) that is provided so as to project on the outer surface portion thereof and is fastened by the 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 mounting 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 mounted on the sensor mounting portion .
A battery unit in which, in the outer surface portion of the battery housing member, a protruding dimension of the temperature sensor toward the peripheral wall portion side is smaller than a protruding dimension of the fastening portion . A battery module (11) in which a plurality of cells (51) are housed in a battery housing member (52);
An accommodating case (16) having a bottom part (31) and a peripheral wall part (32) and accommodating the battery module in a space surrounded by the bottom part and the peripheral wall part;
A temperature sensor (74) for detecting the temperature of the unit cell;
A battery unit (10) comprising:
The battery accommodating member is provided with a fastening portion (65, 70) that is provided so as to project on the outer surface portion thereof and is fastened by the 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 mounting 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 mounted on the sensor mounting portion .
A battery unit in which 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 . A battery module (11) in which a plurality of cells (51) are housed in a battery housing member (52);
An accommodating case (16) having a bottom part (31) and a peripheral wall part (32) and accommodating the battery module in a space surrounded by the bottom part and the peripheral wall part;
A temperature sensor (74) for detecting the temperature of the unit cell;
A battery unit (10) comprising:
The battery accommodating member is provided with a fastening portion (65, 70) that is provided so as to project on the outer surface portion thereof and is fastened by the 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 mounting 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 mounted on the sensor mounting portion .
In the battery housing member, the unit cells are stacked in three or more stages in a direction orthogonal to the bottom portion,
A battery unit in which the temperature sensor is attached to a position corresponding to an intermediate unit cell among the unit cells stacked in three or more stages in the battery housing member .

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