JP2018098062A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack capable of maintaining a fixing state to a vehicle side member even when an excess load is applied.SOLUTION: A battery pack 1 comprises: a plurality of unit batteries 21; a base 30 housing the plurality of unit batteries 21; a stay 32 provided to the base 30 and fixed to a vehicle side member 19; and a coupling plate 9 that couples the base 30 and the vehicle side member 19. A coupling plate 9 includes: a first attachment part 90 provided to one end and attached to the base 30; a second attachment part 91 provided to the other end and attached to the base 30 and the vehicle side member 19; and a connection part 92 that connects the first attachment part 90 and the second attachment part 91. The connection part 92 is a part extended to a width direction of a vehicle, and a width dimension is smaller than the first and second attachment parts 90 and 91. A width narrow part 92 in which the width dimension is a constant, and has a circular arc-shaped is included.SELECTED DRAWING: Figure 4

Description

  The disclosure in this specification relates to a battery pack that houses a battery.

  Patent Document 1 discloses a vehicle battery pack including a battery case attached to the upper surface of a floor panel under a front seat. This battery case has a plurality of rectangular flat plate-like fixing portions for fixing the battery case to the floor panel with bolts or the like. The rectangular flat plate-shaped fixing part is provided so as to protrude from the base part of the lower case toward the door side of the vehicle. 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 2014-24359 A

  The vehicle battery pack as disclosed in Patent Document 1 has a large physique and a low degree of freedom for mounting in the vehicle when a large capacity of the battery is required. If the degree of freedom of mounting is small, an excessive load may be applied to the battery pack at the time of a vehicle collision, and the fixing portion may be damaged. When the fixing portion is damaged, there is a problem that the state in which the battery pack is fixed to the vehicle cannot be maintained.

  In view of such a problem, an object of the disclosure in this specification is to provide a battery pack capable of maintaining a fixed state to a vehicle side member even when an excessive load is applied.

  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 (21), a casing (11, 30) for housing the battery, and a fixing portion (32) provided in the casing and fixed to the vehicle side member (19). And a connecting plate (9) for connecting the casing and the vehicle side member,
The connecting plate is provided at one end and attached to the housing, the first attachment portion (90), provided at the other end and attached to the housing and the vehicle side member (91), and the first attachment A connecting portion (92) connecting the portion and the second mounting portion,
The connecting portion is a portion extending in the width direction (W1) of the vehicle, having a width dimension smaller than that of the first mounting portion and the second mounting portion, the width dimension being constant, and an arc-shaped width. It has a narrow part (92a).

  According to this battery pack, since the connecting plate has a narrow portion whose width dimension is smaller than both end portions, the narrow portion in the vehicle width direction or the collision direction when an impact is applied to the vehicle side portion. Has ductile properties that are easy to extend. Furthermore, since the narrow portion has an arc shape with a constant width dimension, there is an effect of relieving stress concentration in the connecting plate when an impact is applied. Thereby, it can suppress that a connection board fractures | ruptures at the time of an impact. Therefore, even when an excessive load is applied, it is possible to provide a battery pack that can maintain the fixed state to the vehicle side member by maintaining the connection state between the vehicle side member and the casing.

It is a perspective view which shows the battery pack of 1st Embodiment. It is a perspective view which shows the state which removed the cover and the board | substrate about the battery pack of 1st Embodiment. It is a perspective view which shows the lower surface side of the base in the battery pack of 1st Embodiment. It is a bottom view which shows the lower surface side of the base in the battery pack of 1st Embodiment. It is a perspective view which shows the connection board in the battery pack of 1st Embodiment. It is a bottom view which shows the lower surface side of a connection board.

(First embodiment)
The battery pack 1 of 1st Embodiment is demonstrated with reference to FIGS. 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 unit cells 21 are mounted. An example of a vehicle is a vehicle. The battery pack 1 is mounted, for example, under a vehicle seat. The battery pack 1 is arranged in a space between a front seat and a floor of a vehicle, a space between a rear seat and a floor, a space between a rear seat and a trunk room, a space between a driver seat and a passenger seat. 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. In this case, the width direction W1 corresponds to a collision load direction at the time of a side collision in which an impact is applied to the side portion of the vehicle from the outside.

  As shown in FIG. 1, the battery pack 1 includes a cover 11 and a base 30. The cover 11 and the base 30 form an outer shell of the battery pack 1 and constitute a housing 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 resin. 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 in a state where the cover 11 and the substrate that is a part of the electric circuit are 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 a battery and a starter. The electric load 18 is a part or all of a plurality of electric loads of the vehicle excluding the battery and the starter.

  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 battery pack 1 includes a battery unit 20, a base 30, a bus bar unit 40, and an electric circuit. On the base 30, the battery unit 20, the bus bar unit 40, and an electric circuit (not shown in FIG. 2) are mounted. The electric circuit is a functional component including a substrate and a plurality of electric components. The base 30 has a concave container part 31 for installing the battery unit 20. The base 30 accommodates only a part (for example, the lower part) of the battery unit 20 in the container part 31, and the remaining part (for example, the upper part) of the battery unit 20 protrudes from the base 30. The battery unit 20, the bus bar unit 40, and the electric circuit are mounted on the base 30 along the height direction H1 that is the assembly direction. The battery unit 20, the bus bar unit 40, and the electric circuit are fixed to the base 30 by fastening members such as a plurality of screws or bolts.

  The battery pack 1 includes a conductive connection member 80 for electrically connecting the battery unit 20 and an electric circuit. The battery unit 20 has main terminals. The main terminal provides an intermittently controlled output line. The main terminals are total plus terminals as the battery unit 20. The connection member 80 is a conductive member that connects the total plus terminal and the electric circuit.

  In this embodiment, the connection member 80 is provided by a bus bar that is a metal plate having a predetermined shape. The bus bar is manufactured by cutting a metal plate into a predetermined shape and bending it into a predetermined shape in the manufacturing method of the battery pack 1. The connection member 80 includes a first bus bar connected to the battery unit 20 and a second bus bar connected to the electric circuit. The connecting member 80 has a fixing member such as a bolt for fastening the first bus bar and the second bus bar.

  The first bus bar is electrically connected to the total plus terminals of the plurality of single cells 21 included in the battery unit 20 by being fixed by a fixing means. The first bus bar has an opening for receiving the fixing member. The first bus bar has a shape protruding from the battery unit 20 toward the substrate along the depth direction D1. The fixing member fastens the first bus bar along the height direction T1. The fixing member fastens the second bus bar along the height direction T1. The second bus bar extends from the tightening position to the lower side of the substrate and extends toward the substrate. The second bus bar has a plurality of terminals penetrating the substrate. The second bus bar is electrically connected to the electric circuit by being fixed by a fixing means. The fixing means is solder. The fixing means can be provided by various means such as welding and tightening with bolts. The 2nd bus bar has a plurality of terminal parts for connecting to an electric circuit. The second bus bar has an opening for receiving the fixing member.

  The battery unit 20 includes a battery case 22 that houses a plurality of unit cells 21. The battery case 22 is made of an electrically insulating resin. The battery case 22 is a part of a container that houses the plurality of unit cells 21. The battery case 22 fixes a plurality of unit cells 21 to each other. Further, the battery case 22 is also a fixing member that fixes the plurality of single cells 21 to the base 30. The battery case 22 has a plurality of brackets for fixing the battery unit 20 to the base 30. The battery case 22 has a plurality of ribs in order to increase the strength of the wall and / or to reduce the gap between the battery case 22 and the base 30.

  The battery unit 20 has a monitor module 23. The monitor module 23 includes an electrically insulating resin member 24 and a monitor connection member 25 connected to the plurality of single cells 21. The monitor connecting member 25 is embedded in the resin member 24 by insert molding. The monitor connecting member 25 passes through the resin member 24 and connects the unit cell 21 and the electric circuit. The monitor module 23 has a water sensor including a plurality of water detection electrodes. The monitor module 23 is arranged along one surface of the battery case 22 that is a hexahedron. The monitor module 23 is also a lid of the battery case 22.

  The base 30 is made of a conductive metal. 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 31 that receives the battery unit 20. The base 30 has a plurality of stays 32a, 32b, 32c, and 32d. The plurality of stays 32a, 32b, 32c, and 32d 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 bus bar unit 40 provides a power path extending from the power terminal of the battery unit 20. The bus bar unit 40 includes an electrically insulating resin member and a power connection member connected to the battery unit 20. The bus bar unit 40 is fixed on the base 30. The bus bar unit 40 includes a power terminal 41, a power terminal 42, and a power terminal 43. The bus bar unit 40 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 outer power terminal 41 is connected to the generator motor 15. The power terminal 42 located inside the power terminal 41 is connected to the electric load 17. The power terminal 43 is connected to the electric load 18. The bus bar unit 40 is also a member that connects the plurality of power terminals 41, 42, 43, the battery unit 20, and the electric circuit.

  The electric circuit is fixed on the base 30. The electric circuit is provided so as to spread beside the battery unit 20. The electric circuit has a size and shape that extends across one side of the battery unit 20 and the other side of the battery unit 20. The battery unit 20 is installed at one corner of the substantially quadrangular base 30. The electric circuit occupies a key-shaped or L-shaped range extending on the base 30 next to the battery unit 20. The electric circuit is installed along the monitor module 23. A part of the electric circuit is installed in a range extending laterally on the monitor module 23 side of the battery unit 20. The other part of the electric circuit is installed beside the battery unit 20 and beside the peripheral surface of the monitor module 23.

  The electric circuit includes a substrate and a plurality of electric components. The board is a so-called printed board provided with a wiring pattern. The substrate is a flat plate that can be called L-shaped or key-shaped. The substrate extends over the horizontal range occupied by the electrical circuit. The substrate is installed on a heat radiating wall 35 provided on the base 30. The substrate and the heat radiating wall 35 are in direct contact with each other so that heat can move from the substrate to the heat radiating wall 35 or indirectly through a heat conductive member such as a sheet or gel having excellent heat conductivity. Bonded in thermal contact. The heat radiating wall 35 and the stay 32 are integrally formed so that heat can be transferred through other parts of the base 30. For this reason, a heat radiation path is constructed in which the heat transmitted from the substrate to the heat radiation wall 35 is radiated to the vehicle side member 19 through the stay 32.

  The substrate is a single substrate. A plurality of electrical components are arranged on the substrate. The substrate 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 40 and the electrical component. The electric circuit is connected to a plurality of single cells 21. The plurality of electrical components provide a control device. The control device monitors each voltage of the plurality of single cells 21 included in the battery unit 20. The control device monitors the charge state and the discharge state of each of the plurality of unit cells 21. The control device appropriately controls the state of charge of each of the plurality of single cells 21. The unit cell 21 is, for example, a nickel hydrogen secondary battery, a lithium ion battery, or an organic radical battery.

  The plurality of electrical components include one or more switch devices. The switch device is a device that is on / off controlled by an electric circuit. The switch device can intermittently control the output of the battery unit 20. The switch device interrupts the current supplied from the total plus terminal of the battery unit 20. The switch device is mounted on the substrate. The switch device is a semiconductor switch widely known as a transistor, a MOS, or an IGBT. The switch device may be supported in a state of being separated from the substrate. The switch device may be a mechanical relay that is electromagnetically opened and closed.

  The connection member 80 electrically connects the total plus terminal and the switch device. The connection member 80 provides at least a part of the conductive member between the total plus terminal and the switch device. The connection member 80 is installed in the vicinity of the battery unit 20 on the substrate. The connection member 80 is installed on the edge of the substrate closest to the battery unit 20. The connection member 80 is connected at a portion of the board closest to the main terminal of the battery unit 20. A plurality of terminals for the connection member 80 are arranged on the substrate along the battery unit 20. The switch device is disposed in the vicinity of such a connection member 80.

  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 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 may include an inverter and / or a circuit as a converter, and a monitor circuit for observing voltages of the plurality of single cells 21.

  The battery unit 20 has a plurality of conductors that connect the plurality of single cells 21 so as to be energized. The plurality of conductors connect, for example, a plurality of single cells in series. The battery unit 20 has a plurality of monitor terminals. The monitor terminal is used for detecting at least the voltage of the unit cell 21.

  The monitor connecting member 25 and the monitor terminal are electrically connected. The monitor module 23 and the water sensor are integrally provided by sharing the resin member 24. The monitor module 23 and the water sensor can be configured as one part.

  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. In the container part 31, the shape of the base 30 is convex downward and concave from above. 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 external force in the lateral direction that opens the container portion 31, particularly in the width direction W <b> 1. The base 30 has high rigidity with respect to the direction in which the plurality of single cells 21 swell significantly.

  The base 30 has a heat radiating wall 35. On the heat radiating wall 35, a part of the electrical components is arranged via a substrate. Some electrical components are components that require heat dissipation. For example, the switch device in the electric circuit is disposed on the heat radiating wall 35. An insulating sheet is installed between the heat radiating wall 35 and the electrical component, and between the heat radiating wall 35 and the substrate. With this configuration, the heat of the electrical component moves to the heat radiating wall 35 through the insulating sheet. In the base 30, the heat radiating wall 35 is convex upward and concave from the bottom. The heat radiating wall 35 provides a concave heat radiating portion from the bottom on the lower surface of the base 30.

  The container part 31 has at least a side wall 31a, a side wall 31b, a bottom wall 31c, a back wall 31d, and a front wall 31e. The container part 31 is an open container having an opening facing upward for installing the battery unit 20.

  The side wall 31a and the side wall 31b are provided on both sides of the container part 31 in the width direction W1. The side wall 31a and the side wall 31b are provided so as to face the stacking direction of the plurality of unit cells 21, that is, the width direction W1. The inner surface of the side wall 31 a and the inner surface of the side wall 31 b face the container portion 31. The inner surface of the side wall 31 a and the inner surface of the side wall 31 b are surfaces that face the battery unit 20 in the width direction W <b> 1 through a minute gap or are in contact with the battery unit 20.

  The side wall 31 a has a plurality of bolt holes for fixing the battery case 22. The side wall 31 b has a plurality of bolt holes for fixing the battery case 22. These bolt holes have a hole having a depth in the height direction H1, which is the assembly direction, and a female screw formed on the inner surface of the hole. The side wall 31a and the side wall 31b are also formed with other bolt holes for fixing the cover 11 and other bolt holes for fixing components for electrical connection.

  The bottom wall 31 c forms the bottom part of the container part 31. The bottom wall 31c is a wall that connects the lower end of the side wall 31a and the lower end of the side wall 31b. The inner surface of the bottom wall 31 c faces the container portion 31. The inner surface of the bottom wall 31 c faces upward as the upper surface of the base 30 and faces the bottom surface of the battery unit 20. The back wall 31 d is located behind the container portion 31. The back wall 31d is a wall that connects the side wall 31a, the side wall 31b, and the bottom wall 31c. The inner surface of the back wall 31d faces the container portion 31 and faces the surface of the battery unit 20 opposite to the monitor module 23. The back wall 31d connects the upper part of the side wall 31a and the upper part of the side wall 31b. The back wall 31d connects the side wall 31a and the side wall 31b straightly. The back wall 31d provides a beam provided between the side wall 31a and the side wall 31b. The back wall 31d opposes an external force that causes the side wall 31a and the side wall 31b to spread upward and to the outside.

  The front wall 31 e is located at the front part of the container part 31. The front wall 31e is a wall connected to the bottom wall 31c, and is a wall standing from the bottom wall 31c. The front wall 31e may be a wall connecting the side wall 31a, the side wall 31b, and the bottom wall 31c. The front wall 31 e faces the inside of the container portion 31 and faces the monitor module 23 in the battery unit 20. The front wall 31e is a part of the staircase wall formed between the bottom wall 31c and the heat radiating wall 35. The front wall 31e connects the side wall 31a and the side wall 31b. The front wall 31e provides a beam provided between the side wall 31a and the side wall 31b. The front wall 31e opposes an external force that tilts the side wall 31a and the side wall 31b upward and outward.

  As shown in FIGS. 3 and 4, the battery pack 1 includes a connecting plate 9 that connects the base 30 and the vehicle-side member 19. The base 30 has a mounting portion 30a to which one end portion of the connecting plate 9 is fixed, and a stay 32d to which the other end portion of the connecting plate 9 is fixed. The connecting plate 9 has a first attachment portion 90 provided at one end and attached to the mounting portion 30a, and a second attachment portion 91 provided at the other end and attached to the stay 32d and the vehicle side member 19. The connecting plate 9 has a connecting portion 92 that connects the first mounting portion 90 and the second mounting portion 91. The first attachment portion 90, the second attachment portion 91, and the communication portion 92 are flat plate portions, respectively.

  The mounting portion 30a is provided with a mounting hole for inserting a bolt 190 or the like which is an example of a fixing means for fixing the first mounting portion 90 to the base 30. The mounting portion 30a is provided on the lower surface of the base 30 at the edge of the outer peripheral edge portion of the container portion 31 and near the heat radiating wall 35 of the bottom wall 31c. The mounting portion 30 a is provided on the lower surface of the base 30 so as to be closer to the center than the side walls 31 a, 31 b, and back wall 31 d, and to be positioned directly below the heat radiating wall 35. The bolt 190 is an example of a fixing member for fixing the first mounting portion 90 to the base 30. An attachment hole 90 a for inserting a bolt 190 or the like that is an example of a fixing means for fixing the first attachment portion 90 to the base 30 passes through the first attachment portion 90. Further, the first mounting portion 90 may be fixed to the mounting portion 30a by a fixing means such as welding.

  The stay 32d is provided with a mounting hole for inserting a bolt 191 or the like as an example of a fixing means for fixing the second mounting portion 91 to the base 30. The stay 32d is provided on the lower surface of the base 30 as a portion that is an outer peripheral edge portion of the container portion 31 and protrudes outward from the side wall 31b. Therefore, the stay 32d is located at the same height as the lower surface of the bottom wall 31c, like the mounting portion 30a, and is provided at a position closer to the back wall 31d and closer to the side wall 31b than the mounting portion 30a. The bolt 191 is an example of a fixing member for fixing the second attachment portion 91 to the base 30. An attachment hole 91 a for inserting a bolt 191 or the like as an example of a fixing means for fixing the second attachment portion 91 to the base 30 passes through the second attachment portion 91. The mounting hole 91a is a long hole whose longitudinal direction is the width direction W1 of the vehicle. Further, the second mounting portion 91 may be fixed to the stay 32d by fixing means such as welding.

  As shown in FIGS. 5 and 6, the first attachment portion 90 is provided with a first support portion 90 b that protrudes in the thickness direction and fits with a part of the base 30. The first support portion 90b is provided on both sides of the attachment hole 90a in the first attachment portion 90. The first support portion 90b is a flat plate-shaped protruding piece having a surface parallel to the depth direction D1 and the height direction H1. The first support portion 90b is a flat plate-like protruding piece having a surface orthogonal to the width direction W1. Accordingly, the two first support portions 90b face each other and protrude in the same direction from both ends of the first attachment portion 90 in the width direction W1. The two first support portions 90b can be formed so as to protrude in the same direction by bending both ends of the first attachment portion 90 in the width direction W1 into a right angle. The two first support portions 90b support a part of the casing by supporting the base 30 so as to sandwich a part of the base 30. The two first support portions 90b prevent the first mounting portion 90 from displacing in the width direction W1 with respect to the base 30, so that the impact of the first mounting portion 90 and the base 30 in the collision load direction can be reduced. Has the function of regulating relative displacement. Further, the first support portion 90b prevents the first mounting portion 90 from being displaced in the depth direction D1 with respect to the base 30 by contacting the side surface of the bottom wall 31c when an external force is applied at the time of impact. It has a function.

  The second mounting portion 91 is provided with a second support portion 91 b that protrudes in the thickness direction and fits with a part of the base 30. The second support portion 91b is a plate-like protruding piece having a surface parallel to the width direction W1 and the height direction H1. The 2nd support part 91b is a flat projection piece which has a field orthogonal to depth direction D1. The second support portion 91b projects in the same direction as the first support portion 90b at the end of the second support portion 91b. The flat plate surface of the second support portion 91b is orthogonal to the flat plate surface of the first support portion 90b.

  The 2nd support part 91b can be formed so that it may protrude in the same direction as the 1st support part 90b by bending the edge part of the depth direction D1 in the 2nd attachment part 91 at right angle. The second support portion 91b may be configured by two projecting pieces that are in a facing relationship like the first support portion 90b. The second support portion 91b supports a part of the housing by making surface contact with a wall portion formed in a part of the base 30 and parallel to the height direction H1. The second support portion 91b prevents the second mounting portion 91 from displacing in the width direction W1 with respect to the base 30, so that the relative displacement of the second mounting portion 91 and the base 30 in the collision load direction at the time of impact. It has a function to regulate. The second support portion 91b also has a function of preventing the second mounting portion 91 from being displaced in the depth direction D1 with respect to the base 30 when an external force is applied at the time of impact.

  The connecting portion 92 is a portion extending in the width direction W1 of the vehicle and has a narrow portion 92a having an arc shape. The narrow portion 92a is a flat plate portion having a width dimension smaller than that of the first mounting section 90 and the second mounting section 91, and the width dimension is constant. The connecting portion 92 includes a wide portion 92c wider than the narrow portion 92a near the first attachment portion 90, a wide portion 92d wider than the narrow portion 92a near the second attachment portion 91, a wide portion 92c, and a wide portion 92d. And a narrow portion 92a that connects between the two. The wide part 92c is a flat part extending along the depth direction D1 from the first attachment part 90 to the narrow part 92a. The wide portion 92d is a flat plate-like portion extending along the width direction W1 from the second attachment portion 91 to the narrow portion 92a. The wide portion 92c and the wide portion 92d form surfaces that are at the same position in the height direction T1, but form surfaces that extend perpendicular to each other. Accordingly, the connecting portion 92 is formed in an L shape by a linear wide portion 92c and a wide portion 92d that are orthogonal to each other, and a narrow portion 92a that curves in a fan shape between the wide portion 92c and the wide portion 92d. .

  A narrowed portion 92a is formed with a narrowed portion 92b having a concave cross-sectional shape. The recessed direction of the throttle part 92b is opposite to the protruding direction of the first support part 90b and the second support part 91b. The throttle part 92 b has a shape extending along the outer periphery of the connecting part 92. The throttle part 92b is formed across the narrow part 92a, the wide part 92c, and the wide part 92d in the connecting part 92. Accordingly, the narrowed portion 92b is formed to extend to the wide portion 92c and the wide portion 92d on both sides of the narrow portion 92a. Thus, it is preferable that the narrowed portion 92b is provided not only for the narrow portion 92a but also for improving the rigidity as well as ductility over almost the entire connecting portion 92.

  The narrowed portion 92b can be formed by pressing so that the connecting portion 92 is recessed in one direction in the thickness direction. Therefore, the outer shape of the attachment hole 91a, the attachment hole 90a, the first support part 90b, the second support part 91b, the throttle part 92b, and the connecting plate 9 can be manufactured by press working using a press die and a press machine. it can.

  The plurality of bus bars 45, bus bars 46, and bus bars 47 each have a portion extending along the battery unit 20. The plurality of bus bars 45, bus bars 46, and bus bars 47 extend in parallel. The plurality of bus bars 45, bus bars 46, and bus bars 47 are distributed on both sides of the heat radiating wall 35. According to such an arrangement, it is possible to provide the battery pack 1 suitable for connection with an electrical component installed on the heat radiating wall 35. This arrangement can contribute, for example, to shortening a current path through which a relatively large current interrupted by the switch device flows. Therefore, it is possible to contribute to suppressing the heat generation of the electric circuit by shortening the current path while promoting the heat radiation of the plurality of electric components by the heat radiating wall 35.

  The connection member 80 is installed between the battery unit 20 and the heat radiating wall 35. The connection member 80 that is also a part of the bus bar unit 40 is adjacent to the heat radiating wall 35. For this reason, since it is possible to form a heat radiation path for heat transfer to the heat radiation wall 35 with respect to the connection member 80, it is possible to contribute to suppressing heat generation of the electric circuit.

  The battery unit 20 is mounted on the base 30. The battery case 22 is fixed to the base 30 with a plurality of bolts 71. The plurality of bolts 71 are inserted into bolt holes provided in the base 30. The plurality of bolts 71 fasten a bracket provided on the battery case 22 toward the base 30. The plurality of bolts 71 function as fastening members.

  Next, effects obtained by the battery pack 1 of the first embodiment will be described. The battery pack 1 includes a stay 32 that is provided on a base 30 that is a part of the casing and is fixed to the vehicle-side member 19, and a connecting plate 9 that connects the base 30 and the vehicle-side member 19. The connection plate 9 is provided at one end and attached to the base 30, the second attachment portion 91 provided at the other end and attached to the base 30 and the vehicle side member 19, and the first attachment portion 90. And a connecting portion 92 that connects the second mounting portion 91 to each other. The connecting portion 92 is a portion extending in the width direction (depth direction D1) of the vehicle, has a width dimension smaller than that of the first mounting portion 90 and the second mounting portion 91, is constant, and has an arc shape. A narrow portion 92a is formed.

  According to the battery pack 1, the connecting plate 9 has the narrow part 92a whose width dimension is smaller than both ends. With this configuration, for example, when an impact is applied to the side portion of the vehicle due to a collision or the like, the narrow portion 92a has a ductility characteristic that it easily extends in the collision direction that is the width direction of the vehicle. Further, since the narrow portion 92a has an arc shape with a constant width dimension, it contributes to alleviating the stress applied to the connecting portion 92. Therefore, there is an effect of relaxing the stress concentration in the connecting plate 9 when an impact is applied. Thereby, even if the fixed part etc. of the vehicle side member 19 and the stay 32 are destroyed at places other than the connecting plate 9 at the time of an impact, it can suppress that the connecting plate 9 breaks. Therefore, even when an excessive load is applied, the connecting plate 9 maintains the connection state between the vehicle side member 19 and the battery pack 1, so that the battery pack 1 can be maintained in a fixed state to the vehicle side member 19. Can be provided.

  The second attachment portion 91 is provided with an attachment hole 91a through which a fixing member for connecting the second attachment portion 91 and the vehicle side member 19 is inserted. The mounting hole 91a has a long hole shape with the width direction of the vehicle as the longitudinal direction. According to this configuration, when an impact is generated that causes the battery pack 1 to move in the width direction of the vehicle, the fixing member can be relatively displaced in the longitudinal direction of the long hole with respect to the second mounting portion 91. Therefore, the load acting on the fixing member such as the bolt 191 inserted through the mounting hole 91a can be reduced. Therefore, it can contribute to maintaining the connection state of the vehicle side member 19 and the battery pack 1 through the connection plate 9 by the ductility of the connection plate 9 and the effect of suppressing the breakage of the fixing member.

  A narrowed portion 92a is formed with a narrowed portion 92b having a concave cross-sectional shape. According to this configuration, the rigidity of the narrow portion 92a can be increased by the throttle portion 92b. As a result, it is possible to provide the connecting plate 9 that has ductility characteristics such that it easily extends in the collision direction when an impact is applied to the side portion of the vehicle due to a collision or the like, and has improved strength against an external force in the bending direction.

  The throttle part 92b extends to a wide part 92c wider than the narrow part 92a near the first attachment part 90 and a wide part 92d wider than the narrow part 92a near the second attachment part 91. Is formed. According to this configuration, it is possible to provide the narrowed portion 92b extending over the wide portion 92c, the narrow portion 92a, and the wide portion 92d. Therefore, it is possible to provide the connecting plate 9 in which the strength of the connecting portion 92 is increased not only by the narrow portion 92a but also by the narrowed portion 92b over the wide range of the connecting portion 92.

  The connecting plate 9 has a shape that protrudes in the thickness direction at the first mounting portion 90 and a shape that protrudes in the thickness direction at the second mounting portion 91 and a first support portion 90 b that fits with a part of the base 30. And a second support portion 91b fitted to a part of the base 30. According to this configuration, even when a load is applied, the coupling force between the first mounting portion 90 and the base 30 can be strengthened by the first support portion 90b, and the second mounting portion 91 and the base 30 can be strengthened by the second support portion 91b. Can be strengthened. Thereby, it can contribute to maintaining the connection state of the vehicle side member 19 and the battery pack 1 through the connection plate 9 by the ductility of the connection plate 9 and the strengthening of the coupling force between the connection plate 9 and the housing.

(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 electric circuit 50 includes the plurality of switch devices 53. Instead of this, the electric circuit 50 may include a single switch device 53. The electric circuit 50 may include a switch array in which a plurality of switch devices 53 are accommodated in a circuit package. The switch array may be mounted on the substrate 51 or may be supported away from the substrate 51.

  In the above-described embodiment, the unit cells 21 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 unit cell 21 has, for example, an internal space of a flat container that is hermetically 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 plurality of single cells 21 are housed in a sealed state in the flat container by sealing the periphery of the flat container. Each unit cell 21 has a pair of electrode terminals drawn outward from the flat container.

  As the unit cell 21 constituting the battery unit 20 in the above-described embodiment, for example, a unit cell having a cylindrical outer shape may be used.

  In the above-described embodiment, the plurality of unit cells 21 constituting the battery unit 20 may be installed in a state in which the unit cells are in contact with each other without providing a gap, or a predetermined gap is provided between the unit cells. You may make it install with opening.

9 ... Connecting plate, 11 ... Cover (housing)
19 ... Vehicle side member, 21 ... Single cell (battery)
30 ... Base (housing), 32 ... Stay (fixing part)
90 ... 1st attachment part, 90b ... 1st support part, 91 ... 2nd attachment part 91a ... Attachment hole, 91b ... 2nd support part, 92 ... Connection part 92a ... Narrow part, 92b ... Diaphragm part 92c, 92d ... Wide part, 191 ... Bolt (fixing member)
W1 Width direction (vehicle width direction)

Claims (5)

A battery (21);
A housing (11, 30) for housing the battery;
A fixing portion (32) provided in the housing and fixed to the vehicle side member (19);
A connecting plate (9) for connecting the housing and the vehicle side member;
With
The connecting plate is provided at one end and attached to the housing, and a first attaching portion (90), and provided at the other end and attached to the housing and the vehicle-side member (91). A connecting portion (92) connecting the first mounting portion and the second mounting portion;
The connecting portion is a portion extending in the width direction (W1) of the vehicle, has a width dimension smaller than the first mounting portion and the second mounting portion, the width dimension is constant, and has an arc shape. A battery pack having a narrow portion (92a). The second attachment portion is provided with an attachment hole (91a) through which a fixing member (191) for connecting the second attachment portion and the vehicle side member is inserted,
The battery pack according to claim 1, wherein the attachment hole has a long hole shape with a width direction of the vehicle as a longitudinal direction.   The battery pack according to claim 1 or 2, wherein a narrowed portion (92b) having a concave cross-sectional shape is formed in the narrow portion.   The narrowed portion includes a wide portion (92c) wider than the narrow portion near the first attachment portion and a wide portion (92d) wider than the narrow portion near the second attachment portion in the communication portion. The battery pack according to claim 3, wherein the battery pack is formed so as to extend.   The connecting plate has a shape that protrudes in the thickness direction at the first mounting portion, and a shape that protrudes in the thickness direction at the first mounting portion (90b) that fits a part of the housing. The battery pack according to any one of claims 1 to 4, further comprising a second support portion (91b) that fits with a part of the housing.

Images