JP2017069033A - On-vehicle battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the output performance of a battery cell at a low temperature while ensuring the simplification of a structure, without increasing a manufacturing cost.SOLUTION: An on-vehicle battery is equipped with: a battery module 3 which has a plurality of battery cells 12 aligned in a predetermined state and cell covers 11 disposing the plurality of battery cells inside, and in which a part of inner spaces of the cell covers is formed as a chamber 21 to which cooling air is sent; a storage case 2 storing the battery module; an intake duct 36 sending the cooling air into the inside of the cell covers; and an exhaust duct 39 discharging the cooling air sent to the inside of the cell covers. Chamber forming portions 17 forming chambers are provided on the cell covers, and a heat sink 25 composed of a base body 26 formed by resin material and a heat conducting portion 27 formed by metallic material is provided. A heater 22 for heating the plurality of battery cells is attached to the heat sink, and the chamber forming portion and the base body are integrally formed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a technical field relating to an in-vehicle battery that is mounted on a vehicle such as an automobile and can be used even in a cold region.

JP 2013-218792 A JP 2010-140802 A

  Various types of vehicles such as automobiles are equipped with in-vehicle batteries for supplying electric power to motors and various electrical components.

  In recent years, vehicles such as EVs (Electric Vehicles), HEVs (Hybrid Electric Vehicles), and PHEVs (Plug-in Hybrid Electric Vehicles) are becoming popular. In a vehicle powered by electricity, an in-vehicle battery having a high power storage function is mounted.

  The vehicle-mounted battery has a battery module. The battery module includes, for example, a plurality of battery cells (secondary batteries) such as nickel metal hydride batteries and lithium ion batteries, a fixing member that fastens the battery stack in the stacking direction, and a bus bar module that electrically connects the battery cells. And.

  The output performance of the battery cell used in such an in-vehicle battery varies depending on the temperature, and the output performance of the battery cell decreases at low temperatures. Therefore, regarding a vehicle-mounted battery used in a cold region, there is a possibility that sufficient power is not supplied from the vehicle-mounted battery to the motor or the like at a low temperature such as winter, and a necessary output cannot be obtained in the motor or the like.

  In view of this, in-vehicle batteries used in cold regions are provided with a heater, and the battery cell is heated by the heater at a low temperature to improve the output performance of the battery cell (for example, Patent Document 1 and Patent). Reference 2).

  In the in-vehicle battery described in Patent Document 1, a plurality of battery cells are arranged inside the case, heat exchange members are attached to both sides of the case, and the ducts are arranged on both sides of the case. Each is provided with a temperature control device, and a thermoelectric conversion element is disposed between the heat exchange member and the temperature control device. At low temperatures, each thermoelectric conversion element is energized to heat the heat medium, and the plurality of battery cells disposed inside the case are heated by the heat medium.

  In the vehicle-mounted battery described in Patent Document 2, each battery cover is held inside each cell cover, and a large number of heater wires are embedded in each cell cover on the outer peripheral side of each battery cell. Is arranged. When the temperature is low, each heater wire is energized to heat the battery cell held inside the cell cover.

  By the way, in the vehicle battery used in cold regions, the output of the heater may not be sufficient depending on the surrounding environment, etc., and the power supply from the vehicle battery to the motor, etc. becomes insufficient, and the motor is sufficient May not be able to obtain correct output. In particular, when the vehicle has not been run for a long time after the vehicle has been run or is placed in an extremely low temperature environment, there is a possibility that the recovery time until a stable output of the battery cell is ensured may be prolonged. is there.

  In addition, increasing the number of heaters or increasing the output of heaters in order to increase the heating performance of battery cells in an in-vehicle battery has the problem of complicating the structure and reducing the manufacturing cost. .

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to overcome the above-described problems, to ensure the simplification of the structure, and to improve the output performance of the battery cell at a low temperature without causing an increase in manufacturing cost.

  First, an in-vehicle battery according to the present invention includes a plurality of battery cells arranged in a predetermined state and a cell cover in which the plurality of battery cells are arranged. A battery module formed as a chamber into which cooling air is sent, a storage case that houses the battery module, an intake duct that sends the cooling air to the inside of the cell cover, and an inside of the cell cover. An exhaust duct for discharging the cooling air, and a chamber forming portion for forming the chamber is provided in the cell cover, and a base body formed of a resin material and a heat conducting portion formed of a metal material. And a heater for heating the plurality of battery cells is attached to the heat sink, and the chamber forming portion and the base are attached. Scan body is one that is formed integrally.

  Thereby, the chamber forming part and the base body of the heat sink are made common.

  2ndly, in the vehicle-mounted battery which concerns on above-mentioned this invention, the said base body is the flat base board part to which the said heater was attached, and the protrusion part protruded from the said base board part to the said battery cell side, and It is desirable that the heat conducting portion is provided in a portion other than the tip of the protruding portion.

  Thereby, when the crushing or dropping out of each part occurs due to a vehicle collision or the like, the tip surface of the projecting part which is a non-conductive part is brought into contact with the battery cell.

  Thirdly, in the above-described vehicle-mounted battery according to the present invention, it is desirable that a plurality of the protruding portions are provided and the protruding portions are formed in a shape extending in the arrangement direction of the plurality of battery cells.

  Thereby, the cooling air sent to a chamber flows along a protruding part.

  4thly, in the vehicle-mounted battery which concerns on above-mentioned this invention, it is desirable to provide the said heat sink with the rectification | straightening part which rectifies | straightens the said cooling air sent to the said chamber, and flows it toward the said protruding part.

  As a result, the cooling air is flowed in the necessary direction by the rectifying unit.

  Fifth, in the above-described vehicle-mounted battery according to the present invention, it is preferable that the battery cell and the heater are positioned on opposite sides of the heat sink, and the heater is positioned outside the chamber.

  As a result, the heater is positioned outside the battery module.

  6thly, in the vehicle-mounted battery which concerns on above-mentioned this invention, it is desirable to form the heat-transfer hole opened to the said heater side and the said battery cell side in the said heat sink, respectively.

  Thereby, the heat generated in the heater is transmitted to the battery cell side through the heat transfer holes.

  7thly, in the vehicle-mounted battery which concerns on above-mentioned this invention, it is desirable to provide the cooling fan which flows the said cooling air, and to stop the drive of the said cooling fan at the time of the drive of the said heater.

  Thereby, the flow in the inside of a battery module of the air heated by a heater and heating a battery cell is suppressed.

  Eighth, in the above-described vehicle-mounted battery according to the present invention, it is desirable that a heat insulating material be attached to the heater.

  Thereby, the discharge | release of the heat from the heater to the exterior of a battery module is suppressed.

  According to the present invention, the chamber forming portion and the base body of the heat sink are made common, so that it is not necessary to form the chamber forming portion and the base body separately, and the simplification of the structure is ensured and the manufacturing cost is increased. Thus, the output performance of the battery cell at low temperatures can be improved.

2 to 13 show an embodiment of the in-vehicle battery of the present invention, and this figure is an exploded perspective view of the in-vehicle battery. It is a perspective view of a vehicle-mounted battery. It is a perspective view which shows a part of storage case. It is a perspective view of a battery module. It is sectional drawing which shows the state by which the battery module is arrange | positioned at the bottom wall. It is a conceptual diagram which shows a battery module with a duct in the state which removed the top | upper surface part. It is a perspective view which shows a heater and a heat sink. It is an expanded sectional view of a heat sink. It is sectional drawing which shows the example in which the heat insulating material was attached to the chamber formation part. FIG. 11 shows a chamber forming portion according to a first modification together with FIG. 11, and this figure is a perspective view. It is a perspective view shown in the state seen from the direction different from FIG. FIG. 13 is a perspective view showing a chamber forming portion according to a second modified example together with FIG. It is a perspective view shown in the state seen from the direction different from FIG.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this vehicle-mounted battery of this invention is demonstrated with reference to an accompanying drawing.

  The in-vehicle battery 1 has a storage case 2 and battery modules 3, 3,... (See FIGS. 1 and 2). The in-vehicle battery 1 is disposed, for example, above a vehicle body floor such as a luggage compartment behind the rear seat of the vehicle.

  The storage case 2 has a storage portion 4 that opens upward and a flat lid portion 5 that closes the opening of the storage portion 4 from above. The storage unit 4 includes a front wall 6 facing in the front-rear direction, a rear wall 7 positioned on the rear side of the front wall 6, a side wall 8, 8 positioned left and right and a bottom wall 9 facing in the up-down direction. And have. The front wall 6, the rear wall 7, the side walls 8, 8 and the bottom wall 9 are all formed by, for example, extrusion molding of aluminum or the like and have a hollow cross section.

  The front wall 6 is formed with cavities 6a, 6a, 6a extending in the left and right directions, and the rear wall 7 is formed with cavities 7a, 7a, 7a extending in the left and right directions. Cavities 8a, 8a,... Are formed in the side walls 8 and 8 so as to extend in the front-rear direction and to be aligned vertically. Duct insertion holes 6b, 6b, 6b are formed in the front wall 6 so as to be separated from each other in the left-right direction. Cable insertion holes 6c, 6c are formed in the front wall 6 at one end in the left-right direction. Duct insertion holes 7b, 7b are formed in the rear wall 7 so as to be separated from each other in the left-right direction.

  The bottom wall 9 is formed with hollow portions 9a, 9a,. On the upper surface side of the bottom wall 9, partition projections 10, 10,. The partition protrusions 10, 10,... Protrude upward.

  For example, four battery modules 3, 3,... Are stored in the storage case 2 side by side (see FIGS. 1 and 2).

  The battery module 3 includes a cell cover 11 and a plurality of battery cells 12, 12,... Arranged side by side in the cell cover 11.

  As shown in FIGS. 4 to 6, the cell cover 11 is positioned on the rear side of the front surface portion 13 facing the front-rear direction and the rear surface portion 14 facing the front-rear direction and is separated from the left and right sides. 15 and 15, a top surface portion 16 facing in the vertical direction, and chamber forming portions 17 and 17 attached to the side surface portions 15 and 15, respectively.

  The side surfaces 15, 15 are the mounting surface portions 18, 18 facing in the left-right direction and the upper projecting surface portions 19, 19 projecting in a direction approaching each other in the left-right direction from the upper edges of the mounting surface portions 18, 18 and the lower edges of the mounting surface portions 18, 18. The lower projecting surface portions 20 and 20 are projected in a direction approaching each other in the left-right direction. The attachment surface portion 18 is formed with an opening 18a penetrating left and right in a portion excluding the outer peripheral portion.

  The chamber forming portion 17 is formed of a resin material in a shallow box shape opened to one side and the front and back sides, and the side plate portion 17a facing the left and right direction and the upper plate portion protruding sideways from the upper edge of the side plate portion 17a. 17b, a lower plate portion 17c protruding sideways from the lower edge of the side plate portion 17a, and a front and rear plate portion 17d protruding sideways from the front edge or rear edge of the side plate portion 17a. The chamber forming portion 17 has an opening edge in the left-right direction attached to the outer peripheral portion of the attachment surface portion 18. By attaching the chamber forming portions 17 and 17 to the outer peripheral portions of the attachment surface portions 18 and 18, respectively, spaces are formed on both the left and right sides inside the cell cover 11, and these spaces are formed as chambers 21 and 21, respectively. . One opening before and after the chamber forming portion 17 is formed as a connection opening 17e.

  The top surface portion 16 is formed with insertion holes 16a, 16a penetrating vertically in both front and rear ends.

  A heater 22 is attached to a surface of the one chamber forming portion 17 facing the outside of the side plate portion 17a. As shown in FIGS. 5 to 7, the heater 22 is formed in a flat plate shape whose front-rear direction is larger than the vertical direction, with the heating wire 22 b provided on the resin base 22 a. Has been.

  As the heater 22, for example, a PTC (Positive Temperature Coefficient) heater that controls the amount of heat release by self-detecting the ambient temperature can be used.

  The heater wires (not shown) for supplying current to the heater 22 include, for example, the cavity portions 6a, 6a,... Of the front wall 6, the cavity portions 7a, 7a,. Can be arranged in the eight cavity portions 8a, 8a,... Or in the cavity portions 9a, 9a,.

  By arranging the heater wires in the cavity 6a, the cavity 7a, the cavity 8a or the cavity 9a, the cavities 6a, 7a, 8a, 9a are used as the arrangement space for the heater wires, and the heater wires are arranged. There is no need to separately form a space inside the storage case 2, and the vehicle-mounted battery 1 can be reduced in size by effectively utilizing the space.

  The battery cells 12, 12,... Are placed on the lower projecting surface portions 20, 20 of the left and right side portions 15, 15 and held by the cell cover 11, with small gaps in the front and rear, etc. They are arranged side by side at intervals (see FIG. 6). The battery cell 12 is provided with a positive electrode side terminal 12 a and a negative electrode side terminal 12 b that protrude upward, respectively, spaced apart from each other on the left and right. The battery cells 12, 12,... Are connected to the positive and negative terminals 12a, 12a,... And the negative terminals 12b, 12b,. Are connected in series.

  On the upper surface of the battery cells 12, 12,..., A pressing plate 24 is attached below the top surface portion 16 (see FIGS. 5 and 6). The holding plate 24 is formed with arrangement holes 24a, 24a,. In the arrangement hole 24a, the positive electrode side terminal 12a and the negative electrode side terminal 12b of the battery cells 12 and 12 positioned adjacent to each other in the front-rear direction and a connection plate 23 for connecting the two are arranged.

  The heat released from the heater 22 is transmitted to the battery cells 12, 12,. The heat sink 25 includes a base body 26 made of a resin material and a heat conducting portion 27 made of a metal material (see FIGS. 7 and 8). The base body 26 of the heat sink 25 is formed integrally with the chamber forming portion 17 to which the heater 22 is attached.

  The base body 26 includes a flat base plate portion 26a facing in the left-right direction and projecting portions 26b, 26b,... Projecting laterally from the base plate portion 26a toward the battery cells 12, 12,. Have. The base plate portion 26 a is a portion formed integrally with the side plate portion 17 a of the chamber forming portion 17, and is formed in a rectangular shape that is slightly larger than the heater 22. The protrusions 26b, 26b,... Extend in the front-rear direction and are spaced apart at equal intervals in the vertical direction. The projecting portions 26b, 26b,... Are provided at positions extending from the front end to the rear end of the base plate portion 26a, and the vertical cross-sectional shape is formed in a rectangular shape, for example.

  The heat sink 25 has heat transfer holes 25a, 25a,. The heat transfer holes 25a, 25a,... Are formed, for example, in the base plate portion 26a, and are positioned at regular intervals on the left and right sides between the protruding portions 26b, 26b,. The heat transfer holes 25a, 25a,... Are formed in a circular shape, for example.

  Note that the heat transfer holes 25a, 25a,... May be formed at positions extending from the base plate portion 26a to the protruding portion 26b.

  In the heat sink 25, working holes 25b, 25b,. The action holes 25b, 25b,... Are formed, for example, on the protruding portions 26b, 26b,. The action holes 25b, 25b,... Are formed in a rectangular shape, for example.

  The heat conducting portion 27 is formed by plating each surface on the surface of the base body 26 with, for example, aluminum. The heat conducting portion 27 is provided on each surface of the base body 26 at a portion other than the tip portion including the tip surfaces 26c, 26c,... Of the projecting portions 26b, 26b,.

  The heat conducting portion 27 includes a contact portion 27a provided on one side surface (outer side surface) of the base plate portion 26a and a facing portion 27b provided on the other side surface of the base plate portion 26a and spaced apart from each other. , 27b,..., And peripheral portions 27c, 27c,... And heat transfer holes 25a, 25a,. , And the second hole interiors 27e, 27e provided on the peripheral surfaces forming the working holes 25b, 25b,..., Respectively. It consists of ...

  The contact portion 27a of the heat sink 25 is attached by adhesion or the like with one side surface of the heater 22 in surface contact. When the heater 22 is attached to the heat sink 25, the front end surfaces 26c, 26c,... Of the projecting portions 26b, 26b,. .. are positioned to face one side surface of the battery cells 12, 12,.

  The heat released from the heater 22 is transmitted to the heat conducting portion 27 of the heat sink 25 and released from the heat transferring portion 27, and the battery cells 12, 12,... Are heated by the heat released from the heat sink 25.

  In the storage case 2, a plug sensor box 28 and a junction box 29 are stored at both left and right ends (see FIGS. 1 and 2). A battery control unit (not shown) that controls the entire vehicle battery 1 is disposed inside the storage case 2.

  The plug sensor box 28 is provided with predetermined connection plugs, sensors, and the like.

  The junction box 29 includes a casing 30 formed in a vertically long shape, and control components 31, 31,... That are arranged in the casing 30 and control current and the like. As the control components 31, 31,..., For example, relays, fuses, connector terminals, and the like are provided. One end of the cables 32 and 32 inserted through the cable insertion holes 6c and 6c of the front wall 6 is connected to the junction box 29, and the junction box 29 is mounted on the floor of the vehicle by the cables 32 and 32 and is not shown. (Inverter) is connected.

  The battery modules 3 are inserted between the plug sensor box 28 and the junction box 29 and stored in the storage case 2. The battery modules 3, 3,... Are arranged in a state where they are placed on the upper surface of the bottom wall 9 at positions partitioned by partition projections 10, 10,. (See FIG. 5).

  As described above, in the state in which the battery modules 3, 3,..., The plug sensor box 28 and the junction box 29 are stored in the storage case 2, the battery cell of the battery module 3 positioned adjacent to the plug sensor box 28. 12 and the plug sensor box 28 are connected by a first connection bus bar 33, and the battery cell 12 of the battery module 3 positioned adjacent to the junction box 29 and the junction box 29 are connected by a second connection bus bar 34. The One end portion of the first connection bus bar 33 and one end portion of the second connection bus bar 34 are inserted into insertion holes 16a and 16a formed in the top surface portions 16 and 16 of the battery modules 3 and 3, respectively. 12 and 12 are connected to the positive terminal 12a or the negative terminal 12b.

  Further, the battery cells 12, 12,... Of the adjacent battery modules 3, 3,... Are connected to each other by DC connection bus bars 35, 35,. The DC connection bus bars 35, 35,... Are inserted into insertion holes 16 a, 16 a,... Formed in the top surfaces 16, 16,. Are connected to the positive terminals 12a, 12a,..., Or the negative terminals 12b, 12b,.

  The plug sensor box 28 and the junction box 29 are connected to predetermined parts such as a battery control unit by electric wires or bus bars.

  On the front side of the battery modules 3, 3,..., Intake ducts 36, 36 are provided side by side. The intake duct 36 includes an intake portion 37 extending left and right and connecting portions 38 and 38 protruding rearward from the intake portion 37. An intake opening 37a is formed on the outer end surface of the intake portion 37, and inflow openings (not shown) are formed on the rear end surfaces of the coupling portions 38 and 38, respectively.

  The air intake ducts 36, 36 have the air intake portions 37, 37 positioned on the front side of the front wall 6 in the storage case 2, and the connecting portions 38, 38, ... are formed in the duct insertion holes 6b, 6b formed in the front wall 6, respectively. , 6b, and the rear ends of the connecting portions 38, 38,... Are respectively provided with chamber forming portions 17, 17, to which the heaters 22, 22,. .. Are connected to the front end (see FIG. 6). Therefore, the inflow opening of the connecting portions 38, 38,... And the connecting openings 17e, 17e,... Of the chamber forming portions 17, 17,. The cooling air taken in is sent to the chambers 21, 21,... Formed inside the battery modules 3, 3,.

  The cooling air sent to the chambers 21, 21, ... flows from the gaps between the battery cells 12, 12, ... toward the opposite chambers 21, 21, .... At this time, the heat sink 25 is formed in a shape in which a plurality of protrusions 26b, 26b,... Extend in the front-rear direction, which is the arrangement direction of the battery cells 12, 12,. The cooling air is fed in the same direction as that of the cooling air.

  As described above, the extending direction of the protruding portions 26b, 26b,... Of the heat sink 25 is the same direction as the cooling air feeding direction to the chamber 21, so that the cooling air sent to the chamber 21 is the protruding portion 26b. , 26b,..., And a sufficient amount of cooling air flows to the sides of all the battery cells 12, 12,. Therefore, the protrusions 26b, 26b,... Are formed in a shape extending in the arrangement direction of the battery cells 12, 12,. In addition, the battery cells 12, 12,... Can be cooled without unevenness.

  Exhaust ducts 39 and 39 are provided on the rear side of the battery modules 3, 3... Spaced apart from each other (see FIGS. 1 and 2). The exhaust duct 39 has a fan arrangement part 40 having a substantially circular outer shape, a connecting protrusion 41 protruding forward from the fan arrangement part 40, and an exhaust part 42 protruding sideways from the fan arrangement part 40. Yes. The front end of the connecting protrusion 41 is bifurcated in the left-right direction, and outflow openings 41a, 41a are formed on the front end face. An exhaust opening (not shown) is formed in the distal end surface of the exhaust part 42.

  A cooling fan 43 is rotatably arranged inside the fan arrangement portion 40. The cooling fan 43 has a function of causing the cooling air to flow from the connection protrusion 41 side to the exhaust portion 42 side by being rotated.

  The exhaust ducts 39, 39 are fan ducts 40, 40 and exhaust parts 42, 42 positioned on the rear side of the rear wall 7 of the storage case 2, and the connecting projections 41, 41 are formed on the rear wall 7, respectively. Chamber forming portions 17, 17, which are inserted through the insertion holes 7 b, 7 b and the front ends of the connecting projections 41, 41 are not attached to the heaters 22, 22,. ... connected to the rear end (see FIG. 6). Therefore, the outflow openings 41a, 41a,... Of the connection protrusions 41, 41 and the connection openings 17e, 17e,. , 12,... Are discharged from the chambers 21, 21,... Through the exhaust ducts 39, 39 through the exhaust openings.

  The flow of the cooling air in the intake ducts 36, 36, the battery modules 3, 3,... And the exhaust ducts 39, 39 is forcibly performed by the cooling fans 43, 43, and the battery cells 12, 12,. Are efficiently cooled.

  In the vehicle-mounted battery 1 configured as described above, current is supplied to the heating wire 22b of the heater 22 via the heater wire at low temperatures. When a current is supplied to the heating wire 22 b, the heating wire 22 b generates heat and heat is transmitted from the heater 22 to the heat sink 25, and the air inside the battery module 3 is warmed by the heat released from the heat sink 25. The battery cells 12, 12,... Positioned on the sides are heated.

  The battery cells 12, 12,... Heated by the heater 22 are increased in temperature and output performance is improved, and a high power storage function is ensured.

  The heat from the heater 22 to the heat sink 25 passes through the contact portion 27a from the heating wire 22b through the first hole interiors 27d, 27d,... And the facing portions 27b, 27b,. Are transmitted to the second hole interiors 27e, 27e,. The heat transferred from the heater 22 to the heat sink 25 is mainly from the facing portions 27b, 27b, ..., the peripheral portions 27c, 27c, ... and the second hole interiors 27e, 27e, ... Are discharged to the cells 12, 12,..., And the battery cells 12, 12,... Are heated by the heat released from the heat sink 25.

  As described above, in the in-vehicle battery 1, the heat transfer holes 25a, 25a,... Are formed in the heat sink 25, and the first hole interior 27d provided in the heat transfer holes 25a, 25a,. , 27d,..., 27d,..., And the peripheral portions 27c, 27c,... And the second hole interiors 27e, 27e,.

  Therefore, by forming the heat transfer holes 25a, 25a,... In the heat sink 25, the transfer path of the heat generated in the heater 22 toward the battery cells 12, 12,. The heat loss when being transmitted through the conductive portion 27 is reduced, and the heating efficiency for the battery cells 12, 12,... Can be improved.

  Are formed in the heat sink 25 and the first holes 27d and 27d are provided in the heat transfer holes 25a, 25a,. It becomes large and the improvement of the further heating efficiency with respect to battery cell 12, 12, ... can be aimed at.

  .. Are formed in the heat sink 25 and the second holes 27e, 27e,... Are provided in the action holes 25b, 25b,. The area is further increased, and the heating efficiency for the battery cells 12, 12,... Can be further improved.

  In the in-vehicle battery 1, when current is supplied to the heating wire 22 b of the heater 22, the cooling fans 43, 43 are not rotated and the battery cells 12, 12,... Are controlled not to be cooled. Yes.

  Since the cooling fans 43 and 43 are not rotated when the heater 22 is driven in this way, the flow of air heated by the heater 22 and heating the battery cells 12, 12,... Is suppressed in the battery module 3. Therefore, the heating efficiency of the battery cells 12, 12,... By the heater 22 can be improved.

  As described above, in the in-vehicle battery 1, the heat sink 25 including the base body 26 formed of a resin material and the heat conduction portion 27 formed of a metal material is provided. , 12,... Are attached, and the chamber forming portion 17 and the base body 26 are integrally formed.

  Therefore, by disposing the heat sink 25, the heat radiation area is increased, and the amount of heat released toward the battery cells 12, 12,... Is increased without increasing the number of heaters 22 or increasing the output of the heaters 22. In addition, it is not necessary to form the chamber forming portion 17 and the base body 26 separately, ensuring the simplification of the structure, and the battery cells 12, 12 at a low temperature without increasing the manufacturing cost. The output performance can be improved.

  Further, since the chamber forming portion 17 and the base body 26 are integrally formed, the size (width in the left-right direction) of the battery module 3 is reduced accordingly, and the structure of the in-vehicle battery 1 is simplified and miniaturized. Can be achieved.

  Furthermore, in the in-vehicle battery 1, as described above, the heat sink 25 is formed on the base body 26 formed of a resin material, and the heat conducting portion 27 formed on the outer surface (front surface) of the base body 26 and formed of a metal material. The heat conducting portion 27 is provided in a portion other than the tip portion including the tip surfaces 26c, 26c,... Of the projecting portions 26b, 26b,.

  In the battery module 3, the outer surfaces of the battery cells 12, 12,... Have an intermediate potential, so that the battery cells 12, 12,. Contact with conductive parts can cause a short circuit.

  Therefore, as described above, since the heat conducting portion 27 is not provided at the tip portion including the tip surfaces 26c, 26c,... Of the base body 26, crushing or dropout of each portion occurs due to a vehicle collision or the like. Sometimes the battery cells 12, 12,... Are in contact with the tip surfaces 26c, 26c,... Of the projecting portions 26b, 26b,. Risk can be avoided.

  In the in-vehicle battery 1, a heat insulating material 44 may be attached to the outer surface side of the heater 22 (see FIG. 9).

  Since the heat insulating material 44 is attached to the outer surface side of the heater 22, the release of heat from the heater 22 to the outside of the battery module 3 is suppressed, and the heating efficiency of the battery cells 12, 12,. Can be achieved.

  In the in-vehicle battery 1, the battery cells 12, 12,... And the heater 22 are located on the opposite side across the heat sink 25, and the heater 22 is located outside the chamber 21. The chamber 21 serves as a path for cooling air taken from the outside of the battery module 3, and there is a possibility that unclean air may be taken into the chamber 21 from the outside. .

  Therefore, by positioning the heater 22 outside the chamber 21, the heater 22 is disposed in a favorable environment, and a favorable driving state of the heater 22 can be ensured.

  Hereinafter, modifications of the chamber forming portion will be described (see FIGS. 10 to 13).

  It should be noted that the chamber forming portion 17A and the chamber forming portion 17B according to the modification shown below are provided with an intake portion for taking in cooling air and guiding the cooling air as compared with the chamber forming portion 17 described above. The only difference is that a rectifying unit for rectifying is provided, so that only the parts different from the chamber forming part 17 will be described in detail, and the other parts will be attached to similar parts in the chamber forming part 17. The same reference numerals as those in FIG.

  The chamber forming portion 17A according to the first modification has an intake portion 45 that protrudes downward from the central portion in the front-rear direction of the lower plate portion 17c. The take-in portion 45 is formed in a flat cylindrical shape penetrating vertically. The lower opening of the intake portion 45 is formed as a connection opening 45a, and the connection opening 45a communicates with the inflow opening of the connection portion 38 in the intake duct 36.

  The chamber forming portion 17A is not formed with a connecting opening 17e at either the front end or the rear end of the side plate portion 17a, and the chamber forming portion 17A has a front and rear continuous with the front and rear edges of the side plate portion 17a. Plate portions 17d and 17d are provided.

  The take-in portion 45 may be provided so as to protrude upward from the center portion in the front-rear direction of the upper plate portion 17b.

  The chamber forming portion 17A is not provided with a protruding portion 26b at the central portion in the front-rear direction of the side plate portion 17a, and protrudes toward the battery cells 12, 12,. Arc-shaped rectifying sections 46, 46,... Are provided.

  The cooling air taken in from the taking-in part 45 in the chamber forming part 17a is guided and rectified by the rectifying parts 46, 46,... And the projecting parts located before and after the rectifying parts 46, 46,. It flows toward 26b, 26b,.

  As described above, since the chamber forming portion 17A is provided with the rectifying portions 46, 46,... For guiding and rectifying the cooling air taken in from the taking-in portion 45, the cooling air is surely provided in the necessary direction. The cooling efficiency of the battery cells 12, 12,... Can be improved.

  The chamber forming portion 17B according to the second modification has an intake portion 47 that protrudes downward from one end portion in the front-rear direction of the lower plate portion 17c. The take-in portion 47 is formed in a flat cylindrical shape penetrating vertically. The lower opening of the intake portion 47 is formed as a connection opening 47 a, and the connection opening 47 a communicates with the inflow opening of the connection portion 38 in the intake duct 36.

  The chamber forming portion 17B is not formed with a connection opening 17e at either the front end or the rear end of the side plate portion 17a, and the chamber forming portion 17B is continuously connected to the front edge and the rear edge of the side plate portion 17a. Plate portions 17d and 17d are provided.

  The take-in portion 47 may be provided so as to protrude upward from one end portion in the front-rear direction of the upper plate portion 17b.

  The chamber forming portion 17B is not provided with a protruding portion 26b at one end portion in the front-rear direction of the side plate portion 17a, and protrudes toward the battery cells 12, 12,... At one end portion in the front-rear direction of the side plate portion 17a. Arc-shaped rectifying sections 48, 48,... Are provided.

  The cooling air taken in from the take-in part 47 in the chamber forming part 17a is guided and rectified by the rectifying parts 48, 48,..., And is projected in front of or behind the rectifying parts 48, 48,. It flows toward the shape portions 26b, 26b,.

  As described above, since the chamber forming portion 17B is provided with the rectifying portions 48, 48,... For guiding and rectifying the cooling air taken in from the taking-in portion 47, it is ensured that the cooling air is directed in the necessary direction. The cooling efficiency of the battery cells 12, 12,... Can be improved.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle battery, 2 ... Storage case, 3 ... Battery module, 11 ... Cell cover, 12 ... Battery cell, 17 ... Chamber formation part, 21 ... Chamber, 22 ... Heater, 25 ... Heat sink, 25a ... Heat-transfer hole, 26a ... Base plate part, 26b ... Projection part, 26c ... Tip surface, 27 ... Heat conduction part, 36 ... Intake duct, 39 ... Exhaust duct, 43 ... Cooling fan, 44 ... Insulating material, 17A ... Chamber forming part , 46 ... Rectification part, 17B ... Chamber formation part, 48 ... Rectification part

Claims (8)

A battery that has a plurality of battery cells arranged in a predetermined state and a cell cover in which the plurality of battery cells are arranged, and a part of the internal space of the cell cover is formed as a chamber into which cooling air is sent. Module,
A storage case for storing the battery module;
An intake duct for sending the cooling air into the cell cover;
An exhaust duct for discharging the cooling air sent to the inside of the cell cover;
A chamber forming part for forming the chamber in the cell cover;
A heat sink composed of a base body formed of a resin material and a heat conductive portion formed of a metal material is provided,
A heater for heating the plurality of battery cells is attached to the heat sink,
A vehicle-mounted battery in which the chamber forming portion and the base body are integrally formed. The base body has a flat base plate portion to which the heater is attached and a protruding portion protruding from the base plate portion to the battery cell side,
The in-vehicle battery according to claim 1, wherein the heat conducting portion is provided in a portion other than a tip portion of the protruding portion. A plurality of the protrusions are provided,
The in-vehicle battery according to claim 2, wherein the protruding portion is formed in a shape extending in an arrangement direction of the plurality of battery cells. The in-vehicle battery according to claim 3, wherein the heat sink is provided with a rectifying unit that rectifies the cooling air sent to the chamber and causes the cooling air to flow toward the protruding portion. The battery cell and the heater are positioned on opposite sides of the heat sink;
The in-vehicle battery according to claim 2, 3 or 4, wherein the heater is located outside the chamber. The in-vehicle battery according to claim 5, wherein the heat sink is formed with heat transfer holes opened on the heater side and the battery cell side, respectively. A cooling fan for flowing the cooling air is provided;
The in-vehicle battery according to claim 1, 2, 3, 4, 5, or 6, wherein the driving of the cooling fan is stopped when the heater is driven. The vehicle-mounted battery according to claim 1, claim 2, claim 3, claim 4, claim 5, claim 6, or claim 7, wherein a heat insulating material is attached to the heater.

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