JP2012033299A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device capable of improving safety.SOLUTION: A plurality of battery cells 140a, 140b retained by side plates 120a, 120b and electrically connected to each other by bus bars 160 are surrounded by a frame. A cooling medium for cooling the plurality of battery cells 140a, 140b is introduced and the cooling medium is circulated through the plurality of battery cells 140a, 140b. The frame, in which a cooling passage is formed so that the cooling medium completed in this circulation is discharged, is constituted by a metal housing 110 formed by casting of a metal material. Moreover, it is preferable to apply chamfering work to portions opposite to the battery cells 140a, 140b of edge parts of a cooling medium inlet 180 and a cooling medium outlet 181 provided in the metal housing 110.

Description

  The present invention relates to a power storage device.

  As a background art relating to a power storage device, for example, a technique disclosed in Patent Document 1 is known.

  Patent Document 1 discloses a technology relating to a vehicle mounting structure in which a battery pack is mounted inside a spare tire including a wheel, and the battery pack is protected from external loads and impacts.

JP 2009-12570 A

  In recent years, energy saving and environmental problems are increasing, and electrification has become widespread against these backgrounds. For example, in automobiles, the introduction of hybrid cars and electric cars has become widespread, and in recent years, the penetration rate is large. Also, in other fields such as railway vehicles and construction equipment, electrification of power sources (hybridization) is being promoted. In these devices, an electrical storage device such as a battery or a capacitor is mounted so that electrical energy is stored and mechanical energy (such as vehicle driving power) can be generated from the stored electrical energy. Since the power storage devices used for them have a high voltage, the power storage devices used for them are required to have high safety against external loads and impacts. For this reason, for example, in an automobile, as in the background art, a battery pack is mounted inside a spare tire to protect the battery pack.

  However, the mounting position of the power storage device varies depending on the field of automobiles, railway vehicles, construction equipment, and the like, and also varies depending on the model in the same field, and the mounting configuration as in the background art is not always applicable. Considering such problems of the background art, it is preferable that the power storage device itself has a structure that improves safety.

  One of the representative aspects of the present invention provides a power storage device that can improve safety.

  Here, one of the representative inventions surrounds a plurality of capacitors that are held and electrically connected, introduces a cooling medium of the plurality of capacitors, distributes the cooling medium to the plurality of capacitors, The casing that forms the cooling flow path so as to discharge the circulating medium that has been distributed is constituted by a metal casing formed by casting a metal material.

  Further, in one of the representative aspects of the present invention, an opening for introducing and discharging the cooling medium is provided in the metal casing, and a chamfering process is performed on a portion of the edge of the opening facing the capacitor. It is preferable that it is given.

  According to one of the representative aspects of the present invention, the casing that surrounds the plurality of capacitors is configured by a metal casing formed by metal casting, so that the strength of the power storage device can be improved and the load from the outside It is possible to improve the safety of the power storage device against shock and impact.

  Since such a power storage device can ensure the safety of the power storage device regardless of where it is mounted, it is said that the power storage device is a suitable structure for achieving both improved safety and improved mounting performance of the power storage device. be able to.

The block diagram which shows the structure of the vehicle-mounted electrical system (vehicle drive system) containing the battery apparatus mounted in the hybrid vehicle. The perspective view which shows the external appearance structure of the battery apparatus of FIG. The perspective view which shows the external appearance structure of the whole battery block which comprises the battery apparatus of FIG. It is a perspective view which shows the structure of the battery block of FIG. 3, and shows the positional relationship of an assembled battery (a some battery cell) and a side plate. It is a perspective view which shows the structure of the battery block of FIG. 3, and shows the electrical connection relation of the assembled battery by a bus bar (connection conductor). FIG. 4 is an enlarged perspective view showing a part of the configuration of the battery block of FIG. 3, and shows the shape of a C chamfered portion applied to a portion of the edge of the housing facing the battery cell. FIG. 4 is an enlarged perspective view showing a part of the configuration of the battery block of FIG. 3, and shows the shape of an R chamfered portion that is applied to a portion of the edge of the housing facing the battery cell.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the embodiments described below, a case where the present invention is applied to a battery device (power storage device) including an in-vehicle power supply device for an electric vehicle, particularly an electric vehicle, and a secondary battery, in particular, a lithium ion battery as a power storage device. An example will be described.

  The electric vehicle includes a hybrid electric vehicle including an engine that is an internal combustion engine and an electric motor as a driving source of the vehicle, and a genuine electric vehicle using the electric motor as the only driving source of the vehicle.

  The configuration applied to the battery device described below may be applied to a power storage device including a capacitive device such as a capacitor or a capacitor as a power storage device.

  Moreover, you may employ | adopt other secondary batteries, such as a nickel metal hydride battery, as an electrical storage device.

  First, the configuration of an in-vehicle electric system (electric motor drive system) including a battery device will be described with reference to FIG.

  The in-vehicle electrical system includes a plurality of electrical devices including a motor generator 10, an inverter device 20, a vehicle controller 30 that controls the entire vehicle, and a battery device 1000 that constitutes the in-vehicle power supply device. The battery device 1000 includes a plurality of capacitors, and is configured as a lithium ion battery device including a plurality of lithium ion batteries, for example.

  Motor generator 10 is a three-phase AC machine. There are a synchronous machine and an induction machine as a three-phase AC machine, but either one may be adopted. The motor generator 10 is driven by a motor in an operation mode that requires rotational power, such as when the vehicle is powered and when an engine that is an internal combustion engine is started, and the generated rotational power is supplied to a driven body such as a wheel and an engine. . In this case, the in-vehicle electrical system converts DC power into three-phase AC power and supplies it to the motor generator 10 via the inverter device 20 that is a power converter from the battery device 1000.

  Further, the motor generator 10 is driven by a driving force from a wheel or an engine in an operation mode that requires power generation such as when the vehicle is decelerated or braked, or when the battery device 1000 needs to be charged. To generate three-phase AC power. In this case, the in-vehicle electrical system converts the three-phase AC power from the motor generator 10 into DC power via the inverter device 20 and supplies the DC power to the battery device 1000. Thereby, electric power is stored in the battery device 1000.

  The inverter device 20 is an electronic circuit device that controls the above-described power conversion, that is, conversion from DC power to three-phase AC power, and conversion from three-phase AC power to DC power by operation (on / off) of a switching semiconductor element. It is. The inverter device 20 includes a power module 21, a driver circuit 22, and a motor controller 23.

  The power module 21 is a semiconductor device that includes six switching semiconductor elements and constitutes a power conversion circuit for performing the power conversion described above by switching operations (on / off) of the six switching semiconductor elements.

  The DC positive module terminal is electrically connected to the DC positive external terminal, and the DC negative module terminal is electrically connected to the DC negative external terminal. The DC positive side external terminal and the DC negative side external terminal are power supply side terminals for transmitting and receiving DC power to and from the battery device 1000, and power cables 610 and 620 extending from the battery device 1000 are electrically connected. Yes. The AC side module terminal is electrically connected to the AC side external terminal. The AC side external terminal is a load side terminal for transmitting and receiving three-phase AC power to and from the motor generator 10, and a load cable extending from the motor generator 10 is electrically connected thereto.

  The motor controller 23 is an electronic circuit device for controlling the switching operation of the six switching semiconductor elements constituting the power conversion circuit. The motor controller 23 generates switching operation command signals (for example, PWM (pulse width modulation) signals) for the six switching semiconductor elements based on a torque command output from a host controller, for example, a vehicle controller 30 that controls the entire vehicle. To do. The generated command signal is output to the driver circuit 22.

  The battery device 1000 includes a battery module (storage module) 100 for storing and discharging electrical energy (charging and discharging DC power), and a control device 900 for managing and controlling the state of the battery module 100.

  The battery module 100 includes two battery blocks (or battery packs), that is, a high potential battery block 100a and a low potential battery block 100b that are electrically connected in series. Each battery block contains an assembled battery. Each assembled battery includes a connection body in which a plurality of lithium ion battery cells (hereinafter simply referred to as “battery cells”) are electrically connected in series. The configuration of each battery block will be described later.

  An SD (service disconnect) switch 700 is provided between the negative electrode side (low potential side) of the high potential battery block 100a and the positive electrode side (high potential side) of the low potential battery block 100b. The SD switch 700 is a safety device provided to ensure safety during maintenance and inspection of the battery device 1000, and is composed of an electric circuit in which a switch and a fuse are electrically connected in series. It is operated by maintenance personnel during maintenance and inspection.

  The control device 900 includes a battery controller 300 corresponding to the upper (parent) and a cell controller 200 corresponding to the lower (child).

  The battery controller 300 manages and controls the state of the battery device 1000, and notifies the vehicle controller 30 and the motor controller 23, which are host control devices, of charge / discharge control commands such as the state of the battery device 1000 and allowable charge / discharge power. For the management and control of the state of the battery device 1000, the voltage and current of the battery device 1000 are measured, the storage state (SOC: State Of Charge) and the deterioration state (SOH: State Of Health) of the battery device 1000, There are measurement of the temperature of the battery block, output of a command to the cell controller 200 (for example, a command for measuring the voltage of each battery cell, a command for adjusting the storage amount of each battery cell, and the like).

  The cell controller 200 is a limb of the so-called battery controller 300 that manages and controls the state of a plurality of battery cells according to a command from the battery controller 300, and includes a plurality of integrated circuits (ICs). Management and control of the state of a plurality of battery cells include measurement of the voltage of each battery cell, adjustment of the amount of electricity stored in each battery cell, and the like. Each integrated circuit has a plurality of corresponding battery cells, and performs state management and control on the corresponding plurality of battery cells.

  A plurality of corresponding battery cells are used as the power source of the integrated circuit constituting the cell controller 200. For this reason, both the cell controller 200 and the battery module 100 are electrically connected via the connection line 800. The voltage of the highest potential of a plurality of corresponding battery cells is applied to each integrated circuit via the connection line 800.

  Both the positive terminal of the high-potential side battery block 100a and the DC positive side external terminal of the inverter device 20 are electrically connected via a positive side power cable 610. The negative electrode terminal of the low-potential side battery block 100b and the DC negative electrode side external terminal of the inverter device 20 are electrically connected via a negative electrode power cable 620.

  A junction box 400 and a negative main relay 412 are provided in the middle of the power cables 610 and 620. Inside the junction box 400, a relay mechanism including a positive-side main relay 411 and a precharge circuit 420 is housed. The relay mechanism is an opening / closing unit for electrically connecting and disconnecting the battery module 100 and the inverter device 20. When the on-vehicle electric system is activated, the relay mechanism is connected between the battery module 100 and the inverter device 20. When the system is stopped or abnormal, the battery module 100 and the inverter device 20 are disconnected. Thus, by controlling between the battery apparatus 1000 and the inverter apparatus 20 with a relay mechanism, the high safety | security of a vehicle-mounted electrical machinery system is securable.

  The driving of the relay mechanism is controlled by the motor controller 23. When the on-vehicle electric system is activated, the motor controller 23 receives a notification of completion of activation of the battery device 1000 from the battery controller 300, thereby outputting a conduction command signal to the relay mechanism to drive the relay mechanism. The motor controller 23 receives an output signal from the ignition key switch when the in-vehicle electric system is stopped, and receives an abnormal signal from the vehicle controller when the in-vehicle electric system is abnormal. A relay command is driven by outputting a shutoff command signal.

  The main relay includes a positive side main relay 411 and a negative side main relay 412. The positive-side main relay 411 is provided in the middle of the positive-side power cable 610, and controls the electrical connection between the positive side of the battery device 1000 and the positive side of the inverter device 20. The negative main relay 412 is provided in the middle of the negative power cable 620 and controls the electrical connection between the negative side of the battery device 1000 and the negative side of the inverter device 20.

  The precharge circuit 420 is a series circuit in which a precharge relay 421 and a resistor 422 are electrically connected in series, and is electrically connected to the positive-side main relay 411 in parallel.

  When starting the in-vehicle electric system, first, the negative side main relay 412 is turned on, and then the precharge relay 421 is turned on. Thereby, after the current supplied from the battery device 1000 is limited by the resistor 422, the current is supplied to the smoothing capacitor mounted on the inverter and charged. After the smoothing capacitor is charged to a predetermined voltage, the positive main relay 411 is turned on and the precharge relay 421 is opened. Thereby, the main current is supplied from the battery device 1000 to the inverter device 20 via the positive-side main relay 411.

  A current sensor 430 is housed in the junction box 400. The current sensor 430 is provided to detect a current supplied from the battery device 1000 to the inverter device 20. The output line of the current sensor 430 is electrically connected to the battery controller 300. The battery controller 300 detects the current supplied from the battery device 1000 to the inverter device 20 based on the signal output from the current sensor 430. This current detection information is notified from the battery controller 300 to the motor controller 23, the vehicle controller 30, and the like.

  The current sensor 430 may be installed outside the junction box 400. The current detection part of the battery device 1000 is not limited to the inverter device 20 side of the positive main relay 411 but may be the battery module 100 side of the positive main relay 411.

  Note that a voltage sensor for detecting the voltage of the battery device 1000 may be housed in the junction box 400. The battery controller 300 detects the overall voltage of the battery device 1000 based on the output signal of the voltage sensor. This voltage detection information is notified to the motor controller 23 and the vehicle controller 30. The voltage detection part of the battery device 1000 may be on the battery module 100 side or the inverter device 20 side of the relay mechanism.

  Next, the configuration of the battery device 1000 will be described with reference to FIGS.

  As shown in FIG. 2, the battery device 1000 is composed of two units, a battery module 100 and a control device 900.

  The battery module 100 includes a high potential battery block 100a and a low potential battery block 100b. The high potential side battery block 100a and the low potential side battery block 100b are electrically connected in series.

  The high-potential side battery block 100a and the low-potential side battery block 100b are rectangular parallelepiped assemblies, and are arranged adjacent to each other in parallel so that the axes extending in the longitudinal direction of each block are parallel to each other. . The high-potential side battery block 100a and the low-potential side battery block 100b are juxtaposed on the module base 101 and fixed by fixing means such as bolts. The module base 101 is composed of a rigid thin metal plate (for example, an iron plate) that is divided into three in the short direction of each block (the juxtaposition direction of the blocks), and is fixed to the vehicle. That is, the module base 101 is composed of three members arranged at both ends and the center of each block in the short direction (block juxtaposition direction).

  According to such a configuration, the surface of the module base 101 can be flush with the lower surfaces of the battery blocks 100a and 100b, and the size of the battery module 100 in the height direction can be further reduced.

  A control device 900 is placed over the high potential battery block 100a and the low potential battery block 100b. Each of the high potential battery block 100a and the low potential battery block 100b is fixed with one casing 910 (a metal housing made of an electrically conductive metal material such as an aluminum alloy) constituting the control device 900. Yes. Thereby, the high potential battery block 100a and the low potential battery block 100b are fixed by the control device 900.

  The high potential battery block 100a and the low potential battery block 100b have exactly the same configuration. Therefore, in FIGS. 3 to 7, only the high potential battery block 100a side is shown as a representative of the high potential battery block 100a and the low potential battery block 100b. Hereinafter, only the configuration on the high potential battery block 100a side will be described.

  As shown in FIG. 3, the exterior (housing) of the high-potential side battery block 100a has a rectangular parallelepiped (hexahedral) shape. A metal casing 110 formed by two side portions, two flat plate members called side plates 120 facing each other in the lateral direction of the rectangular parallelepiped, and facing each other in the lateral direction of the rectangular parallelepiped, outside the side plate 120 Two flat members called side covers 130 that are arranged are used as constituent members.

  Since the metal casing 110 is cast and has a thickness compared to a casing made by bending a sheet metal, it has higher strength against external loads and impacts, and has a dimensional accuracy of screw holes and machined surfaces. Since it is higher than sheet metal processing, it is easy to assemble with other parts. Specifically, the metal casing 110 is formed by integrally molding a metal casing 110 by heating and melting an aluminum alloy, pouring the molten alloy into a metal mold, cooling, and solidifying it. ).

  The metal casing 110 may be composed of two or more members cast in the same manner as described above. For example, the first member in which one of the bottom surface and the side surface in the longitudinal direction is integrally formed, A structure in which the other of the upper surface portion and the other side surface portion in the longitudinal direction is integrally formed with a bolt or the like may be used. Further, as the metal material, a metal material other than an aluminum alloy may be used as long as it is conductive and can be cast. Here, the metal material used for the metal casing 110 has conductivity because the metal casing 110 bears a part of the conductive path for grounding the control device 900 to the vehicle body. That is, in the battery device 1000, the module base 101, the metal housing 110, the side cover 130, and the housing 910 of the control device 900 are electrically connected and electrically connected (grounded) to the vehicle body. It has become.

  Thus, according to the battery device 1000 of the present embodiment in which the high-potential side battery block 100a and the low-potential side battery block 100b are configured using the metal casing 110 obtained by casting of the metal material, the battery device 1000 Since the strength of the battery cell can be increased and the protection performance of the battery cell can be increased, the safety and reliability of the battery device 1000 can be improved.

  The interior of the metal casing 110 is a storage chamber in which a plurality of cylindrical battery cells 140a and 140b are stored. The storage chamber also functions as a cooling chamber for the plurality of battery cells 140a and 140b, as will be described later. The plurality of battery cells 140a and 140b are housed inside the metal casing 110 in the state of the assembled battery 140 in which the axial center direction of the cylinder is aligned with the short direction of the battery block.

  The side plate 120 is a molded body formed by molding an electrically insulating resin such as PBT, and is disposed so as to face the short side of the metal casing 110, and is fixed by a fixing means such as a bolt. It is fixed to the body 110.

  As shown in FIG. 4, each battery cell is sandwiched and fixed by the side plate 120, and the assembled battery 140 is insulated from the metal housing 110.

  The assembled battery 140 includes a first battery array configured by arranging a plurality of battery cells 140a in parallel, and a second battery array configured by arranging the same number of battery cells 140b in parallel as in the first battery array. Are stacked in the height direction of the metal casing 110. The positional relationship when the first battery row and the second battery row are stacked is not particularly limited, and may be vertical or stacked. In this embodiment, the first and second battery rows are shifted in the longitudinal direction of the metal casing 110, that is, the first battery row is placed on the cooling medium inlet 180 side described later, and the second battery row is placed on the cooling medium described later. The case where it shifted to the exit 181 side is given as an example. Each battery cell 140a, 140b constituting the assembled battery 140 is covered with a resin tube 150 on the peripheral side surface of the battery can for insulation from peripheral components and other batteries. The side plate 120 is provided with a through-hole in the short direction at a portion where the axis of each battery cell 140a, 140b coincides with the center, and the diameter of the through-hole is smaller than the diameter of the battery cells 140a, 140b.

  Cylindrical battery cells 140a and 140b contain components such as a battery element (power generation element), an electrolytic solution, and a safety valve inside a battery housing, and are sealed by a battery lid. The battery element is a wound body in which a laminate in which a positive electrode material, a separator as an insulating material, a negative electrode material, and a separator are laminated in four layers is wound in a roll shape. The battery casing is a metal cylindrical can. The battery lid is a sealing member that is attached to the open end side of the battery casing and closes the open end side of the battery casing after the battery element, electrolyte, and safety valve are housed inside the battery casing. A positive electrode is formed. The negative electrode is formed on the closed end side of the end opposite to the open end side of the battery casing. The safety valve is a degassing valve that is opened when the pressure inside the battery casing increases, and discharges the generated medium (gas) generated inside the battery casing to the outside. The output voltage of the lithium cell 11 is 3.0 to 4.2v. The average output voltage is 3.6v.

  As shown in FIG. 5, in the assembled battery 140, a plurality of battery cells 140 a and 140 b are electrically connected in series by a plurality of conductive members (connection conductors) called a bus bar 160. The bus bar 160 is made of a thin rectangular (strip-shaped) metal plate (for example, a copper plate). The bus bar 160 is not insert-molded integrally with the side plate 120, and is configured separately from the side plate 120. The planar portions at both ends of the bus bar 160 are joined to the electrode portions of the two battery cells by welding. The battery cell is arranged such that the flat portion at the center of the bus bar 160 (the crossing portion that crosses between the welded portions with the two battery cells) is disposed at a higher position than the welded portion with the battery cells to avoid the side plate 120. Is bent at a right angle from the welded part and lifted up to a position over the wall between the through holes of the side plate 120.

  The secondary battery constituting the assembled battery 140 is not particularly limited as long as it is a chargeable / dischargeable secondary battery, and may be a nickel metal hydride battery or a lithium ion battery.

  Moreover, the connection method of the bus bar 160 and the battery cell is not particularly limited as long as it is electrically connected, and may be a connection by welding or a connection by bolt fixing.

  The side plate 120 is insert-molded with a plurality of voltage detection conductors (not shown) for detecting the respective voltages of the plurality of battery cells 140a and 140b. One end of the plurality of voltage detection conductors is welded to the bus bar 160 and electrically connected to the bus bar 160, and the other end is electrically connected to the cell controller 200 via a fuse (not shown).

  The outer peripheral portion of the side plate 120 has a structure projecting to the outside, that is, the side opposite to the storage chamber of the assembled battery 140, and constitutes an outer peripheral wall over the entire periphery. The outer side of the outer peripheral wall has a planar shape and protrudes outward from the central portion of the bus bar 160.

  In order to extract a voltage from the assembled battery 140 electrically connected in series, the DC positive electrode side input terminal 170a is electrically connected to the positive terminal of the battery cell having the highest potential of the assembled battery 140, and the highest potential is obtained. The negative electrode side input terminal 170b is electrically connected to the negative electrode terminal of the low battery cell. The DC positive electrode side input terminal 170 a and the DC negative electrode side input terminal 170 b are provided so as to protrude from the upper edge of the side plate 120 along the longitudinal direction of the metal casing 110. The direct current positive electrode side input terminal 170a and the direct current negative electrode side input terminal 170b are made of thin metal plates (for example, copper plates). Center portions of the DC positive side input terminal 170 a and the DC negative side input terminal 170 b are insert-molded inside the side plate 120. As described above, the direct current positive electrode side input terminal 170 a and the negative electrode side input terminal 170 b are insert-molded on the side plate 120 and configured integrally with the side plate 120. The battery cells to which the DC positive electrode side input terminal 170a and the negative electrode side input terminal 170b are electrically connected are two adjacent ones at one end of the first battery row among the plurality of battery cells constituting the first battery row. However, the present invention is not particularly limited to this, and any battery cell may be selected.

  A cover member 130 called a side cover is provided on the outside of the side plate 120, that is, on the side opposite to the storage chamber of the assembled battery 140. The covering member 130 is fixed to the side plate 120 by fixing means such as bolts. The covering member 130 is fixed to the outer peripheral wall portion of the side plate 120, and does not contact the bus bar 160, the DC positive electrode side input terminal 170a, and the DC negative electrode side input terminal 170b, and is electrically insulated. The covering member 130 is a flat plate obtained by pressing a metal plate such as iron or aluminum, and has a surface shape substantially the same as the planar shape of the side plate 120. As the covering member 130, a flat plate formed by molding a resin such as PBT may be used. A seal member such as an O-ring is provided between the side plate 120 and the cover member 130, and the space formed between the side plate 120 and the cover member 130, that is, discharged from the battery cells 140 a and 140 b. The gas tightness of the gas discharge chamber that stores and discharges mist-like gas (the aforementioned generation medium) is enhanced.

  As shown in FIG. 3, a cooling medium inlet 180 that constitutes an inlet for introducing cooling air that is a cooling medium into the metal casing 110 is formed on a side surface portion on one side in the longitudinal direction of the metal casing 110. . Further, a cooling medium outlet 181 for discharging cooling air taken into the metal casing 110 from the cooling medium inlet 180 is a side surface portion on the other side in the longitudinal direction of the metal casing 110 (the cooling medium inlet 180 is formed. It is formed on the side part opposite to the side part). The cooling medium inlet 180 and the cooling medium outlet 181 are rectangular through holes, and are arranged so as to be shifted from each other in the height direction of the metal casing 110. In the present embodiment, the case where the cooling medium inlet 180 is formed at a position higher than the cooling medium outlet 181 is shown, but the positional relationship may be reversed.

  In a state where the assembled battery 140 is disposed inside the metal casing 110, a gap is formed between each part (upper surface portion, bottom surface portion, two side surface portions) constituting the metal casing and the assembled battery 140. Yes. A gap is also formed between the plurality of battery cells 140a and 140b constituting the assembled battery 140. These gaps communicate with each other, and cooling air introduced from the cooling medium inlet 180 forms a cooling flow path. The cooling air introduced from the cooling medium inlet 180 flows through the cooling flow path, cools the plurality of battery cells 140a and 140b, and is discharged from the cooling medium outlet 181.

  The metal casing 110 in which the cooling medium inlet 180 and the cooling medium outlet 181 are formed is obtained by casting a metal material as described above. Further, the cooling medium inlet 180 and the cooling medium outlet 181 penetrate perpendicularly to the plane. For this reason, the edge of the cooling medium inlet 180 and the cooling medium outlet 181 is a corner portion having a right-angle shape on the assembled battery 140 side (inside the metal casing 110) and the opposite side (outside the metal casing 110). In addition, the assembled battery 140, particularly the battery cells arranged at both ends in the longitudinal direction of the metal casing 110 are arranged in proximity to the cooling medium inlet 180 and the cooling medium outlet 181. Further, of the edges of the cooling medium inlet 180 and the cooling medium outlet 181, two edges (upper and lower edges) in the height direction of the metal casing 110 are in the range of the diameter of the battery cell (battery at least one of which is closest). Of the opposing regions from the longitudinal direction of the metal housing 110 to the cells 140a and 140b, the cells 140a and 140b are disposed within the opposing region range in the height direction of the metal housing 110). For this reason, a large external force that deforms the metal casing 110 acts on the end surface in the longitudinal direction of the metal casing 110 from the outside to the inside (the assembled battery 140), and out of the edges of the cooling medium inlet 180 and the cooling medium outlet 181. , At least one corner (a portion facing the battery cell) of two edges (upper and lower edges) in the height direction of the metal casing 110 is the battery cell closest to the cooling medium inlet 180 and the cooling medium outlet 181. When contacting the outer peripheral surface, it is considered that there is a high possibility that the resin tube 150 and the cell can of the battery cell will be damaged.

  Therefore, in this embodiment, as shown in FIG. 6, two inner edges in the height direction of the metal casing 110 (upper and lower edges on the assembled battery 140 side) among the edges of the cooling medium inlet 180 and the cooling medium outlet 181. C) chamfering 190 smaller than the thickness (thickness) of the member of the metal casing 110 is applied to the entire region of one or both of the corner portions (parts facing the battery cell). Here, the C chamfering means a chamfering process in which two orthogonal portions (corner portions) are cut into a flat shape at an angle of 45 degrees. In this way, if the chamfering process is performed, a large load or impact that deforms the metal casing 110 acts from the outside, and the metal casing 110 is deformed from the outside in the longitudinal direction to the inside (the assembled battery 140 side), and is cooled. When the edges of the medium inlet 180 and the cooling medium outlet 181 abut on the outer peripheral surface of the battery cell closest to the cooling medium inlet 180 and the cooling medium outlet 181, the abutment is a surface abutment. Compared with the contact, the possibility of causing damage to the resin tube 150 and the cell can of the battery cell can be reduced.

  Thus, according to the battery device 1000 of the present embodiment in which the edges of the cooling medium inlet 180 and the cooling medium outlet 181 are chamfered, the protection performance of the battery cell against external force can be further increased, and the safety of the battery device 1000 is increased. In addition, the reliability can be further improved.

  In addition, according to the present embodiment, the safety of the battery device 1000 can be improved by the configuration of the battery device 1000 itself. Therefore, in order to improve the safety of the battery device 1000, the mounting position of the battery device 1000 with respect to the vehicle Is not significantly limited, and the degree of freedom of mounting the battery device 1000 on the vehicle can be increased.

  Further, as shown in FIG. 7, the chamfering applied to the edges of the cooling medium inlet 180 and the cooling medium outlet 181 is not based on the C chamfer 190 (see FIG. 6), but from the thickness (thickness) of the member of the metal casing 110. Also, a small R chamfer 191 may be used. Here, the R chamfering means a chamfering process in which a portion (corner portion) perpendicular to two surfaces is cut into a round shape. Thus, even if the R chamfer 191 is applied, the same effect as the C chamfer 190 can be obtained.

  Further, an insulating material such as a resin tape is bonded to the surface of the C chamfered portion 190 or the R chamfered portion 191 applied to the edges of the cooling medium inlet 180 and the cooling medium outlet 181, or a resin material is applied. As a result, the safety of the battery device 1000 can be further improved.

Claims (5)

A plurality of electrically connected capacitors,
A holding member for holding the plurality of capacitors;
Surrounds the plurality of capacitors held by the holding member, introduces a cooling medium for cooling the plurality of capacitors, distributes the cooling medium to the plurality of capacitors, and discharges the cooling medium after the circulation And a housing that forms a cooling flow path,
The housing is a metal housing formed by casting a metal material.
A power storage device. The power storage device according to claim 1,
The metal housing has an inlet for introducing the cooling medium and an outlet for discharging the cooling medium,
Chamfering is applied to the part of the inlet and the outlet facing the capacitor at the edge of the outlet,
A power storage device. The power storage device according to claim 2,
The chamfer is a C chamfer,
The C chamfering is performed with a size equal to or less than the thickness of the metal casing.
A power storage device. The power storage device according to claim 2,
The chamfer is an R chamfer,
The R chamfering is performed with a size equal to or less than the thickness of the metal casing.
A power storage device. The power storage device according to claim 3 or 4,
A resin insulating material is adhered or applied to the surface of the chamfered portion,
A power storage device.

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