JP2018190607A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack which can achieve improvement of heat radiation performance of a battery.SOLUTION: A batter pack 1 includes: multiple battery cells 2 installed in a housing; a base 30 forming a part of the housing; a cover 11 incorporated into the base 30; switch devices 54, 55; a cell heat radiation path; and a switch heat radiation path. The base 30 is installed so that heat can be transferred to a vehicle side member 19, and the cover 11 is installed in a state where heat of the battery cell 2 can be transferred thereto. The switch devices 54, 55 are installed so that heat can be transferred to the vehicle side member 19 through the base 30 to control an electric current. The cell heat radiation path is a path which discharges the heat of the battery cell 2 to the outside through the cover 11. The switch heat radiation path is a path which discharges the heat of the switch devices 54, 55 to the vehicle side member 19 through the base 30.SELECTED DRAWING: Figure 3

Description

  The disclosure in this specification relates to a battery pack having a battery.

  Patent Document 1 discloses a battery pack in which a battery case containing a battery cell is housed in a housing case. According to Patent Literature 1, the heat generated in the battery cell moves to the bottom plate portion of the base that forms a part of the housing case via the lower plate portion of the battery case, and is released to the outside from the bottom plate portion. Further, the heat generated by the power element moves through the element heat dissipating part formed in the base and is released to the outside from the back surface of the element heat dissipating part and the plurality of fins. The contents of the prior art documents listed as the prior art are incorporated by reference as an explanation of the technical elements in this specification.

JP 2014-13722 A

  The battery pack of Patent Document 1 is required to further improve the heat dissipation performance from the battery cells.

  An object of the disclosure in this specification is to provide a battery pack capable of improving the heat dissipation of the battery.

  A plurality of aspects disclosed in this specification adopt different technical means to achieve each purpose. In addition, the reference numerals in the parentheses described in the claims and in this section are examples showing the correspondence with the specific means described in the embodiments described later as one aspect, and limit the technical scope. is not.

  One of the disclosed battery packs includes a battery (20) installed inside the casing, and a base (30) that constitutes a part of the casing and is installed so as to be capable of heat transfer with respect to the vehicle side member (19). ), A cover (11; 1011; 2011; 3011; 4011) which is combined with the base to form a part of the housing and is installed in a state in which the heat of the battery can be thermally transferred, and the vehicle side member via the base Switch device (54, 55) that is installed so as to be capable of heat transfer and controls the current, a battery heat dissipation path that releases the heat of the battery to the outside through the cover, and the heat of the switch device via the base And a switch heat radiation path for discharging to the vehicle side member.

  According to this battery pack, the heat of the switch device can be released to the outside of the vehicle side member or the like through the base through the switch heat dissipation path, and the heat of the battery can be released to the outside through the cover by the battery heat dissipation path. Thereby, since the cover is a separate member from the base that receives the heat of the switch device, it is possible to provide a battery heat dissipation path that is less susceptible to thermal interference from the switch device. Therefore, a battery pack that can improve the heat dissipation of the battery can be provided.

It is a top view which shows the battery pack of 1st Embodiment. It is a top view which shows the state which removed the cover about the battery pack. It is explanatory drawing which showed the thermal radiation path | route of a switch apparatus and the thermal radiation path | route of a battery cell about the battery pack of 1st Embodiment. It is explanatory drawing which showed the thermal radiation path | route of a switch apparatus and the thermal radiation path | route of a battery cell about the battery pack of 2nd Embodiment. It is explanatory drawing which showed the thermal radiation path | route of a switch apparatus and the thermal radiation path | route of a battery cell about the battery pack of 3rd Embodiment. It is explanatory drawing which showed the thermal radiation path | route of a switch apparatus and the thermal radiation path | route of a battery cell about the battery pack of 4th Embodiment. It is explanatory drawing which showed the thermal radiation path | route of a switch apparatus and the thermal radiation path | route of a battery cell about the battery pack of 5th Embodiment.

  Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly indicate that combinations are possible in each form, but also forms may be partially combined even if they are not clearly specified, as long as there is no problem with the combination. Is possible.

  Currently, a so-called mild hybrid vehicle equipped with an ISS (Idling Stop System) or the like is already popular in the world.

  In the future, not only ISS but also mild hybrid vehicles will be able to use motor assist to assist engine drive and some cruising using ISG (Integrated Starter Generator), which is an electrical device that integrates the functions of starter and generator. Actively incorporating motor drive is being considered. The intent is to actively drive the vehicle using electrical equipment, that is, to drive the vehicle, reduce the chance of driving the engine, improve fuel efficiency, and then release to the atmosphere when the engine is driven. This is because it aims to improve the global environment by reducing the amount of carbon dioxide emitted.

  However, as the electrification progresses, a large-capacity power source is required, and a large current flows through the conductive path connecting each power source such as a starter and a generator from the power source, and heat is generated accordingly. Due to this heat generation, the capacity of the power supply is deteriorated, and there is a risk that problems such as a decrease in the number of charge / discharge cycles may occur.

  Therefore, further improvements have been demanded regarding the heat dissipation performance from the battery cells in the conventionally known battery packs. This embodiment discloses a battery pack capable of improving the heat dissipation of the battery.

(First embodiment)
The battery pack 1 of 1st Embodiment is demonstrated with reference to FIGS. 1-3. Each figure shows a vertical direction or a height direction H1, a width direction W1, and a depth direction D1. In the battery pack 1 of this embodiment, the height direction H1 is set to the vertical direction as one example of installation. The width direction W1 and the depth direction D1 are also horizontal directions orthogonal to the height direction H1.

  The battery pack 1 can be applied to a vehicle on which a plurality of battery cells 2 are mounted. An example of a vehicle is a vehicle. The vehicle is, for example, a hybrid vehicle that uses the battery pack 1 as a traveling drive source by combining an internal combustion engine and a battery-driven motor, an electric vehicle that travels by a battery-driven motor, and the like. In this embodiment, an example in which the battery pack 1 is mounted on a hybrid vehicle will be described. The battery pack 1 in this embodiment is installed, for example, such that the width direction W1 is the vehicle width direction.

  The battery pack 1 is installed in a pack accommodation space such as a trunk room and a trunk room back area provided below the trunk room. The pack storage space can also store, for example, spare tires and tools. The battery pack 1 is installed in the pack accommodation space with the base 30 constituting the bottom wall of the pack case facing downward. The pack accommodation space is a space into which air in the vehicle compartment can flow.

  The vehicle is equipped with an air conditioner that air-conditions the interior of the vehicle. The air conditioner includes a blower unit that takes in air from the outside of the vehicle or the passenger compartment and blows air toward the air conditioning unit, and an air conditioning unit that adjusts the temperature of the air sent by the blower unit and sends the air into the passenger compartment. Therefore, the air in the pack housing space, for example, the air in the vehicle compartment, can come into contact with the cover 11 that forms the casing of the battery pack 1.

  Moreover, you may mount the battery pack 1 in a vehicle so that the floor surface provided in the vehicle may contact. Thereby, the heat in the pack case of the battery pack 1 moves to the floor surface through the wall of the base 30. You may make it interpose the thermal radiation sheet excellent in thermal conductivity in the contact part of the base 30 and a floor surface. The heat in the pack case is transmitted from the base 30 to the floor surface through the heat dissipation sheet.

  The battery pack 1 can be installed as a pack accommodation space below a front seat or a rear seat provided in a vehicle interior. Further, the space for installing the battery pack 1 below the rear seat may be communicated with the trunk room back area below the trunk room. The installation space can be configured to communicate with the outside of the vehicle.

  As shown in FIG. 1, the battery pack 1 includes a cover 11 and a base 30. In the battery pack 1, a part of the housing having at least the cover 11 and the base 30 is fixed to the vehicle-side member 19. The cover 11 and the base 30 form an outer shell of the battery pack 1 and constitute a pack case of the battery pack 1. The cover 11 and the base 30 are pack cases that accommodate each functional component. The cover 11 is made of a metal having thermal conductivity. The cover 11 can be made of aluminum or iron, for example. The cover 11 constitutes the outer shell of the upper part or the ceiling part of the battery pack 1. The base 30 constitutes an outer shell at the bottom or bottom of the battery pack 1.

  FIG. 2 shows the battery pack 1 with the cover 11 removed. The battery pack 1 cooperates with a generator motor (MG) 15 of the vehicle. The battery pack 1 provides a vehicle electric system. The generator motor 15 is connected to an internal combustion engine (EG) 16. The battery pack 1 is connected to an electric load (LD1) 17 and an electric load (LD2) 18 in the vehicle. The electric load 17 is an electric load through which a large current flows, such as an external battery or a starter. The electric load 18 is a general electric load that is a protected load, and includes, for example, a wiper such as an audio, a navigation device, a headlight, and a front windshield, a blower fan for an air conditioner, and a defroster heater for a rear windshield. is there.

  The generator motor 15 functions as a generator when driven by the internal combustion engine 16. The battery pack 1 is charged by supplying at least a part of the power generated by the generator motor 15 to the battery pack 1. When the generator motor 15 is supplied with electric power from the battery pack 1, the generator motor 15 functions as an electric motor. The generator motor 15 functions as a power source together with the internal combustion engine 16. For example, the generator motor 15 supplies power that exceeds the power supplied by the internal combustion engine 16 or power that assists the power supplied by the internal combustion engine 16. The generator motor 15 is, for example, a motor that assists the engine when the engine is restarted from an idling stop or during acceleration.

  The battery pack 1 includes a terminal block unit 14 that inputs and outputs power. The terminal block unit 14 includes a terminal block unit 14A for connecting a Pb storage battery, a terminal block unit 14B for connecting an ISG, and a terminal block unit 14C for connecting a protected load. The terminal block unit 14 </ b> A includes a first input / output terminal 41 connected to the external battery side, and a terminal block that supports the first input / output terminal 41. The terminal block unit 14 </ b> B has a second input / output terminal 42 connected to the rotating machine side and a terminal block that supports the second input / output terminal 42. Each terminal block is made of a material such as a resin having electrical insulation and thermal conductivity. In the terminal block unit 14A and the terminal block unit 14B, the respective terminal blocks are fixed to the base 30 at positions that are arranged side by side in the direction D1. Therefore, each terminal block unit 14 </ b> A, 14 </ b> B, 14 </ b> C is installed in a state in which heat transfer is possible with the base 30.

  An external battery is connected to the first input / output terminal 41 of the terminal block unit 14A via a harness. The first input / output terminal 41 is electrically connected to the electrical component, the battery cell 2 and the like by the conductive bus bar 21. A rotating machine is connected to the second input / output terminal 42 of the terminal block unit 14B via a harness. The second input / output terminal 42 is electrically connected to the electrical component, the battery cell 2 and the like by the conductive bus bar 22. The rotating machine is, for example, a motor generator. For example, a vehicle ECU is connected to the third input / output terminal 43 of the terminal block unit 14 </ b> C, and the third input / output terminal 43 is configured to be connectable to the above-described electric load to be supplied with power from the battery pack 1. . The third input / output terminal 43 is electrically connected to the electrical component, the battery cell 2 and the like by a conductive bus bar. The heat of each bus bar moves to the terminal block unit and the base 30 and is further released to the vehicle side member 19 through the stay 32. Each bus bar and the base 30 are in a heat transferable relationship via a bus bar support member 25 formed of a material having thermal conductivity and insulation.

  Each terminal block unit is provided on the outer periphery of the pack case and is exposed outside the battery pack 1. Each terminal block unit is formed of a material having thermal conductivity and insulation. The terminal block unit 14A, the terminal block unit 14B, and the terminal block unit 14C are integrated with the pack case, and are arranged side by side in a position closer to the switch device 54 than the switch device 55. The terminal block unit 14A, the terminal block unit 14B, and the terminal block unit 14C are installed integrally with the pack case on the outer peripheral portion of the pack case between the stay 32a and the stay 32b among the stays 32 that are a plurality of mounting portions. ing. Further, the terminal block unit 14A, the terminal block unit 14B, and the terminal block unit 14C may be provided as a part of the pack case, or may be a separate component from the pack case and attached to the pack case. The structure installed integrally with the pack case may be sufficient. Each terminal block unit and the base 30 are in a heat transferable relationship.

  The switch devices 54 and 55 are semiconductor switches widely known as transistors, MOSFETs, or IGBTs. The switch devices 54 and 55 may be mechanical relays that open and close contacts using electromagnetic force. Unlike the switch device 53, the switch devices 54 and 55 are examples of electrical components that control a large current, and correspond to heating elements. In addition to the switch devices 54 and 55, a resistor can be included in the electrical component as a heating element having a heat transfer path that can dissipate heat to the base 30 via the bus bar like the switch devices 54 and 55.

  The switch devices 54 and 55 are configured to be connected to the substrate 51 in a state where signal communication is possible by a signal line portion through which no current for supplying power flows. Furthermore, the switch devices 54 and 55 are configured such that a power line portion through which a large current for power supply flows is not connected to the substrate 51. In each switch device 54, 55, a large current flowing through the device main body and the power line portion is not transmitted to the substrate 51.

  The switch devices 54 and 55 have a flat outer shape in which the width dimension of the main body is longer than the thickness dimension. The switch devices 54 and 55 are in contact with the heat radiating wall 31 indirectly through a sheet-like member having thermal conductivity. The heat radiating wall 31 is provided on the base 30 in a form that allows heat transfer to the stay 32 of the base 30. The signal line portion extends from the main body and is connected to the substrate 51 or is connected to an electrical component mounted on the substrate 51. The power line portion is not connected to the substrate 51 but is a conductive component side terminal connected to the first input / output terminal 41 and the second input / output terminal 42 via the bus bars 21 and 22.

  The power line part is a conductive component side terminal joined to the bus bars 21 and 22 by welding or the like. The bus bar 21 and the bus bar 22 are copper conductive members supported by a bus bar support member 25 housed in the base 30 together with an assembled battery or the like. The bus bar support member 25 is also a bus bar housing case that houses the bus bar 21 and the bus bar 22 in a stable state. The bus bar support member 25 is formed of a material having thermal conductivity and electrical insulation, and insulates each bus bar from surrounding members. The bus bar support member 25 is preferably formed of, for example, polybutylene terephthalate resin. It is preferable that the front ends of the bus bars 21 and 22 are located on the inner side of the end portion of the bus bar support member 25 and the end portion of the bus bar support member 25 protrudes outward.

  The means for fixing the main bodies of the switch devices 54 and 55 to the sheet-like member or the heat radiating wall 31 can be configured by fastening and fixing with an insulating adhesive such as a silicon adhesive, bolts or screws. The heat transferred from the main body of the switch devices 54 and 55 to the heat radiating wall 31 through the sheet-like member moves to the side wall of the base 30 and then moves to the vehicle-side member 19 via the stay 32 and then the battery pack. 1 is released to the outside.

  Each bus bar is a conductive plate-like member, and is connected to the power line portion and the power line portion of the switch devices 54 and 55, and a large current for supplying power is energized. The bus bar support member 25 and the terminal block unit 14 may be formed as a single member by integral molding, or may be configured such that separate members are fixed integrally.

  As shown in FIG. 3, the bus bar 21 and the bus bar 22 are thermally connected to the base 30 via the terminal block unit. The bus bar 21 and the bus bar 22 are installed so as to be able to move heat with respect to the base 30 at a position away from a heat radiating wall 31 where electric parts such as switch devices are provided so as to be able to move heat. For this reason, the heat released from each of the bus bar 21 and the bus bar 22 moves to the base 30 via the terminal block unit and is further released to the vehicle side member 19 via the bracket 190 and the stay 32.

  The outer peripheral edge of the connection portion in each bus bar connected to the first input / output terminal 41 and the second input / output terminal 42 is surrounded by side walls forming the terminal block units 14A and 14B. Since this side wall is formed of an insulating material, it contributes to securing an insulation distance from the bus bar. The outer peripheral edge of the connecting portion in each bus bar is provided so as not to protrude outward from the outer ends of the plurality of stays 32 in the base 30. The outer peripheral edge of the connecting portion in each bus bar is provided so as not to protrude outward from the outer ends of the stays 32a and stays 32b that are closest to each other among the plurality of stays 32. The connection part in each bus bar is a part where there is no functional part such as a fixed part or a current-carrying part in the battery pack 1 and is a part that does not protrude outside the outermost part of the battery pack 1. The connection part in each bus bar is provided in the dead space of the battery pack 1 which is such a location.

  The electrical component unit in the battery pack 1 includes bus bars 21 and 22 that are connection members, and a plurality of electrical components each having a component-side terminal connected to a connection terminal portion of the bus bar. The electric component unit can hold each bus bar at a desired position by including a bus bar housing case that supports or houses the bus bars 21, 22 and the like.

  The battery pack 1 includes a battery unit 20, a base 30, an electrical component unit, and an electrical circuit 50. A battery unit 20, an electrical component unit, and an electrical circuit 50 are mounted on the base 30. The electric circuit 50 is a functional component including a substrate 51 and a plurality of electric components 52. The base 30 has a concave container part for installing the battery unit 20. The base 30 accommodates only a part of the battery unit 20, for example, the lower part in the container part, and the remaining part, for example, the upper part of the battery unit 20 protrudes from the base 30. The battery unit 20, the electric component unit, and the electric circuit 50 are fixed to the base 30 by a plurality of fastening members such as screws or bolts.

  The battery unit 20 includes a battery case 40 that houses a plurality of battery cells 2. The battery case 40 is formed of an electrically insulating resin. The battery case 40 is a part of a container that houses the plurality of battery cells 2. The battery case 40 supports each battery cell 2 in a state of being electrically insulated from other battery cells 2. Further, the battery case 40 is also a fixing member that fixes the plurality of battery cells 2 to the base 30. The battery case 40 has a plurality of attachment portions for fixing the battery unit 20 to the base 30.

  The battery case 40 has a box shape having an opening 40a in which the end surface 2b of the battery cell 2 is located inside in order to transfer heat of the battery cell 2 to the cover 11. The opening 40a is provided in the battery case 40 so that all the battery cells 2 included in the battery unit 20 are located inside. All the battery cells 2 are built in the battery case 40 by stacking vertically in a posture in which the surface having the largest surface area faces the adjacent battery cell in the cell case forming the exterior of the battery cell 2. The end surface 2b is the surface of the cell case located on the opposite side to the terminal end surface 2a1 from which the electrode terminal 2a protrudes in the cell case. Therefore, all the battery cells 2 are installed so as to communicate with the outside of the battery case 40 through the opening 40a.

  The terminal end surface 2a1 and the electrode terminal 2a are located inside the casing closer to the center than the end surface 2b. The terminal end face 2a1 and the electrode terminal 2a are opposed to the wall 40b of the battery case 40 located on the side opposite to the opening 40a. The wall 40b is located closer to the switch devices 54 and 55 than the opening 40a, and is located closer to the switch heat dissipation path related to the switch devices 54 and 55. The terminal end surface 2a1 and the electrode terminal 2a are located closer to the switch devices 54 and 55 than the end surface 2b, and are located closer to the switch heat dissipation path with respect to the switch devices 54 and 55.

  The cover 11 includes a ceiling part 11c and a plurality of side wall parts 11b extending in the vertical direction from the peripheral part of the ceiling part 11c. The side wall part 11 b faces the opening part 40 a of the battery case 40. The cover 11 has an opening end portion in which the lower end portions of the plurality of side wall portions 11b are open, and has a protruding piece portion 11a that forms a protruding piece protruding outward from the lower end portion of the side wall portion 11b. The protruding piece portion 11a is combined with the protruding piece portion 30a of the base 30 in a state where the base 30 and the cover 11 are combined, and constitutes a connecting portion between the cover 11 and the base 30 together with the protruding piece portion 30a. A heat insulating portion 113 is interposed between the cover 11 and the base 30. The heat insulating portion 113 functions as a heat resistance portion that suppresses heat transfer between the base 30 and the cover 11. The heat insulating portion 113 is made of a material having higher heat insulating properties than the base 30 or the cover 11. The heat insulating portion 113 is made of a material having a characteristic that the thermal conductivity is smaller than that of the base 30 or the cover 11. For example, the heat insulation part 113 can be comprised with elastomers, such as a resin material, a synthetic rubber, and natural rubber.

  The cover 11 has a heat capacity expanding portion 111 formed on a part of the side wall portion 11b so as to be thicker than the protruding piece portion 11a. The heat capacity expansion part 111 is a part where the heat of the battery cell 2 moves. Since the heat capacity expanding part 111 is a part having a larger volume or thickness than the protruding piece part 11a, the heat transferred from the battery cell 2 can be stored. Thus, heat capacity expansion part 111 accumulates heat, contributes to releasing heat of battery cell 2 from battery cell 2 quickly, and can suppress a temperature rise of battery cell 2. It is preferable that the heat capacity expanding portion 111 is provided above the protruding piece portion 11a in order to suppress the heat to move to the protruding piece portion 11a. According to this configuration, since heat easily moves upward, the heat that has moved to the side wall portion 11b can easily move to the heat capacity expanding portion 111 instead of the protruding piece portion 11a, and heat dissipation of the battery cell 2 can be promoted. .

  The end face 2 b is a part that can be moved by heat with respect to the cover 11. The battery cell 2 is installed in a state where it is pressed against the heat capacity expanding portion 111, that is, in a state where a pressing load is applied. A heat storage unit 112 is provided between the end surface 2 b and the heat capacity expansion unit 111. Therefore, the heat storage part 112 is in contact with the end face 2b and the heat capacity expansion part 111 in a state of being sandwiched between the battery cell 2 and the heat capacity expansion part 111. The heat capacity expanding portion 111 is provided at a position corresponding to the end surface 2 b for all the battery cells 2 included in the battery unit 20. The heat storage unit 112 is a member including a heat storage material such as a paraffin-based latent heat storage material or a microcapsule containing a phase change material. The heat storage unit 112 can store heat transferred from the battery cell 2. When the heat storage unit 112 stores heat, it contributes to quickly releasing the heat of the battery cell 2 from the battery cell 2, and the temperature rise of the battery cell 2 can be suppressed. That is, the battery pack 1 suppresses heat transfer to the base 30 by the allowable heat capacity of the heat storage unit 112 and the heat capacity expansion unit 111.

  The heat of the battery cell 2 moves from the end surface 2b to the heat storage unit 112 and the heat capacity expansion unit 111. Furthermore, when the heat stored in the heat capacity expansion unit 111 exceeds the allowable heat capacity of the heat capacity expansion unit 111, the heat is released from the surface of the heat capacity expansion unit 111 to the atmosphere of the battery pack 1. According to the above configuration, the battery pack 1 includes the battery heat dissipation path that releases the heat of the battery cell 2 to the outside via the cover 11.

  The battery unit 20 has a monitor module. The monitor module includes an electrically insulating resin member and monitor connection members connected to the plurality of battery cells 2. The monitor connecting member is embedded in the resin member by insert molding. The monitor connecting member passes through the resin member and connects the battery cell 2 and the electric circuit 50. The monitor module has a water sensor including a plurality of water detection electrodes. The monitor module is disposed along one surface of the battery case.

  The base 30 is made of metal having thermal conductivity. The base 30 can be made of aluminum or iron, for example. The base 30 is also called a carrier. The base 30 can be formed by, for example, aluminum-die casting. The base 30 has high thermal conductivity and high rigidity. The base 30 includes a container portion that receives the battery unit 20. The base 30 has a plurality of stays 32a, 32b, 32c, 32d, and 32e. The plurality of stays 32a to 32e are collectively referred to as stays 32. The stay 32 is a fixing portion that is fixed to the vehicle-side member 19 in order to fix the battery pack 1 to the vehicle. The vehicle-side member 19 is a part of a vehicle to which the battery pack 1 is mounted in order to fix the battery pack 1, and is a plate-like frame or panel, for example. The stay 32 is provided with a mounting hole for inserting a bolt or the like, which is an example of a fixing means for fixing the stay 32 to the vehicle-side member 19. The stay 32 may be fixed to the vehicle side member 19 by fixing means such as welding.

  The electrical component unit provides a power path extending from the power terminal of the battery unit 20. The electrical component unit has an electrically insulating resin member and a power connection member connected to the battery unit 20. The electric component unit is fixed on the base 30. The electrical component unit has at least two power connection members. One power connection member is provided between one power terminal of the battery unit 20 and another power terminal to provide electrical connection.

  The electric circuit 50 is fixed on the base 30. The electric circuit 50 is provided so as to spread beside the battery unit 20. The battery unit 20 is installed at one corner of the substantially quadrangular base 30. The electric circuit 50 occupies a range extending on the side of the battery unit 20 on the base 30.

  The substrate 51 is a control substrate provided with a wiring pattern. The substrate 51 extends over the horizontal range occupied by the electric circuit 50. The substrate 51 is supported by a predetermined support member. The board | substrate 51 may be the structure installed on the thermal radiation wall 31 provided in the base 30. FIG. In this case, the substrate 51 and the heat radiating wall 31 are made of a heat conductive material such as a sheet or a gel having excellent heat conductivity in a direct contact state so that heat can be transferred from the substrate 51 to the heat radiating wall 31. It is combined in the state of being in thermal contact indirectly. The heat radiating wall 31 and the stay 32 are integrally formed so that heat can be transferred through the wall forming the base 30. For this reason, the battery pack 1 includes a heat dissipation path through which heat transmitted from the substrate 51 to the heat dissipation wall 31 is released to the vehicle-side member 19 through the stay 32 provided on the side wall of the base 30. The battery pack 1 also includes a heat dissipation path through which heat transferred from the substrate 51 to the heat dissipation wall 31 is released from the heat dissipation wall 31 into the air.

  Heat generated by the switch device 53 that controls a relatively low current moves to the heat radiating wall 31 of the base 30 via the substrate 51, and can be moved downward from the heat radiating wall 31 along a plurality of side walls. Further, heat is transmitted from one side wall to the vehicle-side member 19 via the stay 32 at the lower portion and released to the outside. According to this heat dissipation path, a path that extends from the heat dissipation wall 31 along the heat dissipation wall 31 to a plurality of side walls can be configured. Therefore, according to the battery pack 1, the heat-transfer path | route which transmits the solid whose heat conductivity is higher than air can be comprised as a thermal radiation path | route of a heat generating body.

  The substrate 51 is a single substrate. A plurality of electrical components 52 are arranged on the substrate 51. The electrical component 52 is one of the articles that generate heat in the battery pack 1 and corresponds to a heating element. The substrate 51 has a plurality of connection portions. Part or all of the plurality of connection portions provide connection between the power connection member of the bus bar unit and the electrical component 52. The electric circuit 50 is connected to the plurality of battery cells 2. The plurality of electrical components 52 provide a control device. The control device monitors each voltage of the plurality of battery cells 2 included in the battery unit 20. The control device monitors the charge state and the discharge state of each of the plurality of battery cells 2. The control device appropriately controls the state of charge of each of the plurality of battery cells 2. The battery cell 2 is, for example, a nickel hydrogen secondary battery, a lithium ion battery, or an organic radical battery.

  The plurality of electrical components 52 include a switch device 53, a switch device 54, and a switch device 55. The switch devices 53 to 55 are devices that are on / off controlled by the electric circuit 50. The switch devices 54 and 55 can intermittently control the output of the battery unit 20. The switch devices 54 and 55 intermittently supply current supplied from the total plus terminal of the battery unit 20. The switch device 53 is a weak electric component through which a smaller current flows than the switch devices 54 and 55. The switch device 53 is mounted on the substrate 51. Each of the switch devices 53 to 55 is a semiconductor switch widely known as a transistor, a MOSFET, or an IGBT. Further, each of the switch devices 53 to 55 may be a mechanical relay that is electromagnetically opened and closed. Each of the switch devices 53 to 55 is one of the electrical components 52 that generate heat in the battery pack 1 and corresponds to a heating element. In addition to the switch device, the electrical component that is a heating element includes a resistor.

  When water is spilled on the seat, when a passenger who gets wet with water uses the seat, or when the vehicle is immersed in water, water may enter the battery pack 1. In this case, the battery pack 1 may discharge using water as a discharge path. In this embodiment, a water sensor that detects water in the battery pack 1 and a control device that executes countermeasure processing when water is detected are provided. The control device monitors water intrusion into the battery pack 1. The control device executes countermeasures when water intrusion is detected. The countermeasure process is, for example, to turn off a breaker element that is one of a plurality of electrical components.

  The control system provided by the electric circuit 50 provides a control device that is an electronic control unit. The control device has at least one arithmetic processing unit (CPU) and at least one memory device (MMR) as a storage medium for storing programs and data. The control device is provided by a microcomputer including a computer-readable storage medium. The storage medium is a non-transitional tangible storage medium that stores a computer-readable program in a non-temporary manner. The storage medium can be provided by a semiconductor memory or a magnetic disk. The controller can be provided by a computer or a set of computer resources linked by a data communication device. The program is executed by the control device to cause the control device to function as the device described in this specification and to cause the control device to perform the method described in this specification.

  The control system includes a plurality of signal sources that supply signals indicating information input to the control device as input devices. The control system acquires information by the control device storing the information in the memory device. The control system has a plurality of control objects whose operations are controlled by the control device as output devices. The control system controls the operation of the control object by converting information stored in the memory device into a signal and supplying the signal to the control object.

  The control device, the signal source, and the control object included in the control system provide various elements. At least some of these elements can be referred to as blocks for performing functions. In another aspect, at least some of these elements can be referred to as modules or sections that are interpreted as configurations. Furthermore, the elements included in the control system can also be referred to as means for realizing the functions only when intentional.

  The means and / or functions provided by the control system can be provided by software recorded in a substantial memory device and a computer that executes the software, software only, hardware only, or a combination thereof. For example, if the controller is provided by an electronic circuit that is hardware, it can be provided by a digital circuit including a number of logic circuits, or an analog circuit. The electric circuit 50 may include a circuit as an inverter and / or a converter, and a monitor circuit that observes the voltages of the plurality of battery cells 2.

  The base 30 has a plate shape or a dish shape. The base 30 has a shape that can be called a shallow dish shape or a shallow cup shape. The shape of the base 30 is convex downward and concave from above in the container portion. The base 30 has a high rigidity to resist an external force that tries to warp it. The base 30 has high rigidity that resists an external force in the lateral direction of opening the container portion, particularly in the width direction W1. The base 30 has high rigidity with respect to the direction in which the plurality of battery cells 2 swell significantly.

  On the heat radiating wall 31 of the base 30, a part of the electrical components 52 are arranged via the substrate 51. Some of the electrical components 52 are components that require heat dissipation. For example, the switch device 53 in the electric circuit 50 is disposed on the heat radiating wall 31. An insulating sheet is installed between the heat radiating wall 31 and the electrical component 52 and between the heat radiating wall 31 and the substrate 51. With this configuration, the heat of the electrical component 52 moves to the heat radiation wall 31 via the insulating sheet. In the base 30, the heat radiating wall 31 is convex upward and concave from the bottom. The heat radiating wall 31 provides a concave heat radiating portion from the bottom on the lower surface of the base 30.

  On the base 30, a high-power unit in which switch devices 54 and 55 for controlling current to the battery cell 2 are installed, and a low-power unit in which electrical components such as a switch device 53 in which a smaller current flows than the high-power unit are installed , Is provided. The high power unit occupies an area where the switch devices 54 and 55 are installed, for example. The weak electrical unit occupies an area where electrical components other than the switch devices 54 and 55 are installed, for example.

  As shown in FIG. 3, the switch devices 54 and 55 are provided on the base 30 through the heat radiating wall 31 so that heat can be transferred. Each bus bar 21, 22 is connected to the base 30 via the bus bar support member 25 so as to be capable of heat transfer. Each bus bar 21, 22 is connected to a vehicle-side member 19 such as a vehicle underbody through a stay 32 and a bracket 190 of the base 30 so as to be capable of heat transfer. As shown by arrows in FIG. 3, the switch devices 54 and 55 are provided with a switch heat dissipation path that moves from the base 30 to the vehicle side member 19 via the bus bars 21 and 22 and the heat dissipation wall 31. As described above, since the switch heat dissipation path does not have a path overlapping the battery heat dissipation path, the heat of the switch devices 54 and 55 contributes to securing a temperature difference between the battery cell 2 and the cover 11.

  Next, effects obtained by the battery pack 1 of the first embodiment will be described. The battery pack 1 includes a plurality of battery cells 2 installed inside a casing, a base 30 and a cover 11 that constitute a part of the casing, switch devices 54 and 55, a battery heat dissipation path, and switch heat dissipation. A route. The base 30 is installed so as to be capable of heat transfer with respect to the vehicle side member 19. The cover 11 is combined with the base 30 to constitute a part of the housing, and is installed in a state where heat of the battery cell 2 can be transferred. The switch devices 54 and 55 are installed so as to be able to move heat with respect to the vehicle-side member 19 via the base 30 and control current. The battery heat dissipation path is a path for releasing the heat of the battery cell 2 to the outside via the cover 11. The switch heat dissipation path is a path for releasing heat from the switch devices 54 and 55 to the vehicle side member 19 via the base 30.

  According to this battery pack 1, the heat of the switch devices 54 and 55 is released to the outside of the vehicle side member 19 and the like through the base 30 through the switch heat dissipation path, and the heat of the battery cell 2 is released to the outside through the cover 11 by the battery heat dissipation path. can do. The battery heat dissipation path forms a path independent of the switch heat dissipation path. According to this, since the cover 11 is a separate member from the base 30 through which the heat of the switch devices 54 and 55 is transmitted, it is possible to provide a battery heat dissipation path that is less susceptible to thermal interference from the switch devices 54 and 55. Therefore, the battery pack 1 can improve the heat dissipation of the battery cell 2.

  Thus, the battery pack 1 can increase the allowable current value, the energization amount, the energization time, and the like that can be passed through the battery unit 20 by improving the heat dissipation of the battery cell 2. Therefore, the battery pack 1 can improve the working current in the battery pack 1 and reduce the size and weight of the battery unit 20. The battery pack 1 also contributes to improving the fuel efficiency and acceleration performance of the vehicle.

  The heat of the battery cell having a configuration in which the housing and the battery case are not coupled so as to have a heat dissipation path becomes a path to move to the housing via the air between the battery case and the battery case and the housing. . On the other hand, since the battery pack 1 of 1st Embodiment does not comprise the thermal radiation path | route via the air with low heat conductivity, it can improve the thermal radiation performance of the battery cell 2. FIG.

  The battery pack 1 has a heat insulating property higher than that of the base 30 or the cover 11, and includes a heat insulating portion 113 interposed between the cover 11 and the base 30 at a joint portion between the cover 11 and the base 30. According to this configuration, the heat insulating portion 113 contributes to hindering heat transfer from the cover 11 to the base 30 and heat transfer from the base 30 to the cover 11. Thereby, the thermal interference between the battery heat dissipation path and the switch heat dissipation path can be further suppressed, and the battery pack 1 that further improves the heat dissipation performance of the battery cell 2 can be provided.

  The cover 11 has a heat capacity expanding portion 111 having a thickness larger than that of the coupling portion at a portion where the heat of the battery cell 2 moves. According to this configuration, the heat radiation from the battery cell 2 can be collected and stored in the heat capacity expansion unit 111. Thereby, since the heat | fever of the battery cell 2 can be stored in the heat capacity expansion part 111, the temperature rise of the battery cell 2 can be suppressed.

  The battery pack 1 includes a battery case 40 that contacts and supports the battery cell 2. In the battery cell 2, the end surface 2 b located on the opposite side of the terminal end surface 2 a 1 from which the electrode terminal 2 a protrudes is a portion that can be thermally transferred to the cover 11 and is provided so as to penetrate the battery case 40. It is located inside the opening 40a. According to this configuration, since the inner peripheral wall of the opening 40a and the cell case of the battery cell 2 are not in contact with each other, it is difficult to move the heat radiation from the end surface 2b to the battery case 40 and to the cover 11 more. Contribute to.

  The heat capacity expanding portion 111 is provided on the side wall portion 11 b of the cover 11. According to this configuration, since the heat capacity expanding portion 111 with a reduced height dimension can be configured, the battery pack 1 that can improve the heat dissipation performance of the battery cell 2 at a low height can be provided by the cover 11 with a suppressed height.

  The heat capacity expanding portion 111 is exposed to the atmosphere around the cover 11. According to this configuration, it is possible to provide a battery heat radiation path that collects the heat radiation from the battery cells 2 in the heat capacity expansion unit 111 and further releases it to the atmosphere.

  The battery pack 1 is provided between the battery cell 2 and a portion of the cover 11 where the heat of the battery cell 2 moves, and includes a heat storage unit 112 including a heat storage material. According to this configuration, the heat radiation from the battery cell 2 can be collected and stored in the heat storage unit 112. The heat that exceeds the allowable heat capacity of the heat storage unit 112 moves to the cover 11. Thereby, since it has the heat storage capacity of the heat storage part 112 and the heat capacity of the cover 11, the temperature rise suppression of the battery cell 2 can be further promoted.

  The cover 11 is provided above the base 30. According to this configuration, since the heat of the battery cell 2 is moved to the cover 11 positioned above, it is possible to provide a battery heat dissipation path that makes it easy to move the heat of the battery cell 2 to the cover 11.

(Second Embodiment)
2nd Embodiment demonstrates the battery thermal radiation path | route which is another form with respect to 1st Embodiment with reference to FIG. The second embodiment is different from the first embodiment in the installation location of the heat capacity expansion unit 111 and the installation posture of the battery cell 2 associated therewith. Except for this configuration, the second embodiment has the same configuration as the first embodiment, and has the same effects. The contents different from the first embodiment will be described.

  As shown in FIG. 4, the battery pack 101 is different from the battery pack 1 in the configuration of the battery heat dissipation path, that is, the position of the heat capacity expansion unit 111 and the installation posture of the battery cell 2.

  The battery case 40 is installed such that the opening 40a faces the ceiling 11c. All the battery cells 2 are built in the battery case 40 by laminating in the lateral direction with the surface having the largest surface area facing the adjacent battery cell in the cell case. The battery cell 2 is installed with the end surface 2b facing the ceiling portion 11c inside the opening 40a.

  The terminal end surface 2a1 and the electrode terminal 2a are located closer to the base 30 that is below the end surface 2b inside the housing. The terminal end surface 2 a 1 and the electrode terminal 2 a are opposed to the bottom wall portion of the base 30. The wall 40b is positioned closer to the base 30 than the opening 40a and faces the bottom wall of the base 30.

  The cover 1011 has a heat capacity expanding portion 111 in a part of the ceiling portion 11c. The heat of the battery cell 2 moves upward from the end surface 2 b and is stored in the heat storage unit 112 and the heat capacity expansion unit 111. Furthermore, when the heat stored in the heat capacity expansion unit 111 exceeds the allowable heat capacity of the heat capacity expansion unit 111, the heat is released from the surface of the heat capacity expansion unit 111 upward to the atmosphere of the battery pack 1. According to the above configuration, the battery pack 1 includes the battery heat dissipation path that moves the heat of the battery cell 2 upward and releases the heat to the outside via the cover 11.

  According to the second embodiment, the heat capacity expanding portion 111 is provided on the ceiling portion 11 c of the cover 11. According to this configuration, it is possible to provide the heat capacity expansion unit 111 that easily collects the heat of the battery cell 2 using the characteristic of heat that easily moves upward. Therefore, the battery pack 1 that can improve the heat dissipation performance of the battery cell 2 can be provided by the heat capacity expansion unit 111 having a high heat collecting capability.

(Third embodiment)
In 3rd Embodiment, the battery thermal radiation path | route which is another form with respect to 1st Embodiment is demonstrated with reference to FIG. 3rd Embodiment differs in the installation location of the heat capacity expansion part 111, the heat radiation path | route from the thermal storage part 112 to the heat capacity expansion part 111, and the heat radiation path | route from the electrode terminal 2a with respect to 1st Embodiment. Except for this configuration, the third embodiment has the same configuration as the first embodiment, and has the same effects. The contents different from the first embodiment will be described.

  As shown in FIG. 5, the battery pack 201 has a battery heat dissipation path configuration with respect to the battery pack 1, that is, the position of the heat capacity expanding portion 111, the position of the end surface 2 b, the position of the electrode terminal 2 a, the battery case 40 and the cover 2011. The positional relationship is different.

  The battery case 40 is installed in such a posture that the opening 40a is positioned inside the casing and the wall 40b is positioned outside the casing. That is, a part of the battery case 40 protrudes outside the housing. A hole projecting through the battery case 40 is provided in a portion protruding outward. The terminal end surface 2a1 and the electrode terminal 2a are opposed to the wall portion 40b. Therefore, the heat radiation from the terminal end face 2a1 and the electrode terminal 2a is released to the atmosphere of the housing through the hole passing through the battery case 40.

  The cover 2011 is integrally provided with a heat transfer communication portion 114 that extends downward from the inner surface of the heat capacity expanding portion 111 provided in the ceiling portion 11c. The heat transfer communication part 114 is made of a metal having thermal conductivity. The battery cell 2 is installed in a state of being pressed against the heat transfer communication unit 114, that is, in a state where a pressing load is applied. A heat storage unit 112 is provided between the end surface 2 b and the heat transfer communication unit 114. Therefore, the heat storage unit 112 is in contact with the end surface 2b and the heat transfer communication unit 114 in a state of being in contact with the battery cell 2 and the heat transfer communication unit 114. The heat transfer communication part 114 is provided at a position corresponding to the end surface 2 b for all the battery cells 2 included in the battery unit 20.

  The heat of the battery cell 2 moves from the end surface 2b to the heat storage unit 112, and further moves to the heat capacity expansion unit 111 via the heat transfer communication unit 114. When the heat stored in the heat capacity expansion unit 111 exceeds the allowable heat capacity of the heat capacity expansion unit 111, the heat is released from the surface of the heat capacity expansion unit 111 to the atmosphere of the battery pack 201. According to the above configuration, the battery pack 201 has a path for releasing the heat of the battery cell 2 to the outside via the cover 11 and a path for releasing the heat from the electrode terminal 2a and the terminal end surface 2a1 to the outside of the housing. A battery heat dissipation path is provided.

(Fourth embodiment)
4th Embodiment demonstrates the battery thermal radiation path | route which is another form with respect to 1st Embodiment with reference to FIG. The fourth embodiment is different from the first embodiment in the heat dissipation path from the heat capacity expansion unit 111. Except for this configuration, the fourth embodiment has the same configuration as the first embodiment, and provides the same operational effects. The contents different from the first embodiment will be described.

  As shown in FIG. 6, the battery pack 301 includes a connecting member 191 that is thermally connected to both the heat capacity expanding portion 111 of the cover 3011 and the vehicle side member 19. The heat of the battery cell 2 moves from the end face 2 b to the heat storage unit 112 and further moves to the heat capacity expansion unit 111. When the heat stored in the heat capacity expansion unit 111 exceeds the allowable heat capacity of the heat capacity expansion unit 111, the heat is discharged from the heat capacity expansion unit 111 to the vehicle side member 19 through the connection member 191 or from the connection member 191 to the atmosphere. The

  According to the fourth embodiment, the battery pack 301 includes the heat capacity expansion unit 111 connected to the vehicle-side member 19 via the connecting member 191. According to this configuration, the heat stored in the heat capacity expansion unit 111 can be released to the vehicle side member 19 via the connecting member 191.

  The connecting member 191 is made of a material having higher thermal conductivity than the battery case 40 that is in contact with and supported by the battery cell 2. According to this, it is possible to provide the battery pack 301 that easily moves the amount of heat that exceeds the allowable heat capacity of the heat capacity expansion unit 111 to the connecting member 191. Furthermore, since the connecting member 191 that can easily dissipate heat to the external atmosphere can be provided, a heat dissipating path that dissipates heat to the air-conditioned space having a large temperature difference from the cover 11 can be configured.

(Fifth embodiment)
5th Embodiment demonstrates the battery pack 401 which is another form with respect to 1st Embodiment with reference to FIG. The fifth embodiment differs from the first embodiment in the number of battery cells 3 stacked in the vertical direction in the battery unit 20. Except for this configuration, the fifth embodiment has the same configuration as the first embodiment, and has the same effects. The contents different from the first embodiment will be described.

  As shown in FIG. 7, the battery pack 401 is housed in the battery case 40 in which five battery cells 2 are stacked in the vertical direction. The heat capacity expanding portion 111 of the cover 4011 is provided at a position corresponding to the end surface 2 b for all the battery cells 2 included in the battery unit 20. The number of battery cells 2 stacked in the battery unit 20 is not limited to the number disclosed in the first embodiment and the fifth embodiment.

(Other embodiments)
The disclosure of this specification is not limited to the illustrated embodiments. The disclosure encompasses the illustrated embodiments and variations by those skilled in the art based thereon. For example, the disclosure is not limited to the combination of components and elements shown in the embodiments, and various modifications can be made. The disclosure can be implemented in various combinations. The disclosure may have additional parts that can be added to the embodiments. The disclosure includes those in which the components and elements of the embodiment are omitted. The disclosure encompasses parts, element replacements, or combinations between one embodiment and another. The technical scope disclosed is not limited to the description of the embodiments. The technical scope disclosed is indicated by the description of the scope of claims, and should be understood to include all modifications within the meaning and scope equivalent to the description of the scope of claims.

  In the above-described embodiment, the heat storage unit 112 interposed between the end surface 2b and the heat capacity expansion unit 111 may be replaced with a heat transfer unit having excellent thermal conductivity. The heat transfer unit is a member that promotes heat transfer from the battery cell 2 to the cover 11, and is made of, for example, a material having higher thermal conductivity than the cover 11 or the base 30. According to this structure, it contributes to discharging | emitting the heat | fever of the battery cell 2 rapidly to the heat capacity expansion part 111 of the cover 11 via a heat-transfer part, and can suppress the temperature rise of the battery cell 2. FIG.

  In the above-described embodiment, a forced air flow may be formed inside the housing by a blower or the like. For example, a battery pack that promotes heat dissipation of the battery cells 2 can be configured by installing a blower inside the housing and forming a circulating air flow that circulates inside the housing by the blower.

  In the above-described embodiment, the stay 32 of the base 30 may be configured not to be directly fixed to the vehicle side member 19. The stay 32 may be configured to be fixed to the vehicle-side member 19 via a separate member so long as it can be moved to the vehicle-side member 19 so as to be able to move heat.

  In the above-described embodiment, the bus bars 21, 22, and 24 may be configured not to be directly connected to electrical components. The bus bars 21, 22, and 24 may be configured to be connected to the electrical components via separate members as long as the bus bars 21, 22, and 24 are configured to be connected to the electrical components.

  In the above-described embodiment, the battery cell 2 constituting the battery unit 20 may have, for example, a thin flat plate shape of the outer case, and the outer case may be formed of a laminate sheet. The laminate sheet is made of a highly insulating material. The battery cell has, for example, an internal space of a flat container that is sealed by sealing the ends of the laminate sheet that is folded in half by heat-sealing the ends. The internal space contains a battery main body portion including an electrode assembly, an electrolyte, a terminal connection portion, a part of the positive electrode terminal portion, and a part of the negative electrode terminal portion. Therefore, the battery main body part is accommodated in the inside of a flat container in the sealing state by sealing the peripheral part of a flat container in the some battery cell. Each battery cell has a pair of electrode terminals drawn outward from the flat container.

  As the battery cell 2 constituting the battery unit 20 in the above-described embodiment, for example, a battery cell having a cylindrical outer shape may be used.

  In the above-described embodiment, the plurality of battery cells constituting the battery unit 20 may be installed in a state where they are in contact with each other without providing a gap between adjacent battery cells, or between adjacent battery cells 2. You may make it install with a predetermined clearance.

11, 1011, 2011, 3011, 4011 ... cover 19 ... vehicle side member, 20 ... battery unit (battery)
30 ... Base, 54, 55 ... Switch device

Claims (11)

A battery (20) installed inside the housing;
A base (30) that constitutes a part of the housing and is installed so as to be capable of heat transfer with respect to the vehicle side member (19);
A cover (11; 1011; 2011; 3011; 4011) which is combined with the base to constitute a part of the housing and is installed in a state in which heat of the battery can be thermally transferred;
A switch device (54, 55) that is installed so as to be capable of heat transfer to the vehicle side member via the base and controls current;
A battery heat dissipation path for releasing the heat of the battery to the outside via the cover;
A switch heat dissipation path for releasing heat of the switch device to the vehicle-side member via the base;
A battery pack comprising:   The heat insulation part (113) which has heat insulation higher than the said base or the said cover, and is interposed between the said cover and the said base in the coupling | bond part (11a, 30a) of the said cover and the said base is provided. The battery pack described in 1.   3. The battery pack according to claim 2, wherein the cover has a heat capacity expansion portion (111) having a thickness larger than that of the coupling portion at a portion where heat of the battery moves. A battery case (40) for contacting and supporting the battery;
In the battery, an end surface (2b) located on the opposite side of the terminal end surface (2a1) from which the electrode terminal (2a) protrudes is a portion that can be thermally transferred to the cover and penetrates the battery case. The battery pack according to any one of claims 1 to 3, wherein the battery pack is located inside an opening (40a) provided in such a manner.   The battery pack according to claim 3, wherein the heat capacity expanding portion is connected to the vehicle side member via a connecting member (191).   The battery pack according to claim 5, wherein the connecting member is made of a material having higher thermal conductivity than a battery case (40) that contacts and supports the battery.   The said heat capacity expansion part is a battery pack as described in any one of Claim 3, Claim 5, and Claim 6 provided in the ceiling part (11c) in the said cover.   The said heat capacity expansion part is a battery pack as described in any one of Claim 3, 5 and 6 provided in the side wall part (11b) in the said cover.   The battery pack according to any one of claims 3, 5, and 6, wherein the heat capacity expanding portion is exposed to an atmosphere around the cover.   The battery pack according to any one of claims 1 to 9, further comprising a heat storage portion (112) that is interposed between a portion of the cover where heat of the battery moves and the battery and includes a heat storage material. .   The battery pack according to any one of claims 1 to 10, wherein the cover is provided above the base.

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