JP2020074279A - Battery pack - Google Patents

Abstract

To provide a battery pack capable of suppressing increase of the installation area thereof even when the capacity thereof is increased.SOLUTION: A battery pack 1 includes plural battery stacks 160a and 160b in which plural batteries 161 are stacked in the thickness direction of each battery, a housing 10 for housing the plural battery stacks 160a, 160b, a harness 18 for connecting terminals 12 and 14 provided in the housing 10 and the terminals of a battery group 16 in which the plural battery stacks 160a and 160b are connected to each other, and relays 43, 44 arranged in the middle of the harness 18. The plural battery stacks 160a and 160b are stacked in plural stages in a direction perpendicular to the installation surface 10a of the housing 10 so that the thickness direction is parallel to the installation surface 10a of the housing 10, and the relays 43, 44 are arranged in alignment with the battery stacks 160a, 160b in the thickness direction in the housing 10.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a battery pack, and more particularly to the structure of a battery pack.

  A battery pack in which a plurality of batteries are connected and housed in a housing is widely used. For example, Patent Document 1 discloses a battery pack mounted on a vehicle. This battery pack is placed under the seat of a passenger car, and in order to secure a wide living space, some battery stacks have a small vertical thickness so that the thickness direction of each battery module overlaps the vertical direction. It is placed flat.

JP, 2013-171662, A

  However, in the flat battery pack described in Patent Document 1, when the capacity of the battery pack is increased, if the number of stacked layers is increased in the height direction of the vehicle, the space for a person riding the vehicle becomes narrow. Moreover, in order to increase the installation area, it may be possible to place it in a wide area on the upper part of the vehicle, but in this case, not only the space for the people who board the vehicle becomes narrower, but in the case of vehicles such as trucks, work from the upper side of the vehicle There are many things to do, which hinders the work.

  An object of the present invention is to provide a battery pack that can suppress an increase in installation area even when the capacity is increased.

The battery pack according to the present invention is
A plurality of battery stacks in which a plurality of batteries are stacked in the thickness direction of each battery,
A housing containing the plurality of battery stacks,
A harness that connects terminals provided on the housing and terminals of a battery group that connects the plurality of battery stacks,
With a relay routed in the middle of the harness,
The plurality of battery stacks are stacked in a plurality of stages in a direction perpendicular to the installation surface of the housing so that the thickness direction is parallel to the installation surface of the housing.
The relay is arranged side by side with the battery stack in the thickness direction in the housing,
Further comprising an explosion-proof valve for lowering the internal pressure when the internal pressure of the housing rises,
The explosion-proof valve is provided on the installation surface of the housing.

  According to the present invention, it is possible to provide a battery pack that can suppress an increase in installation area even when the capacity is increased.

It is a figure which shows typically the external appearance of the battery pack which concerns on one Embodiment of this invention. It is a figure which shows typically the structure of the bottom face of the battery pack of FIG. It is a figure which shows the structural example of the explosion-proof valve with which the battery pack of FIG. 1 is equipped. It is a figure which shows an example of the vehicle which mounts the battery pack of FIG. It is a figure for demonstrating the circuit structure of the battery pack of FIG. It is a figure for demonstrating the physical structure inside the battery pack of FIG. It is a figure which shows an example of the battery module which the battery pack of FIG. 1 has. It is a figure which shows an example of the battery cell which the battery module of FIG. 7 has. It is a circuit diagram which shows the example of a connection of the battery element in the battery cell of FIG. FIG. 9 is an exploded perspective view of the battery module of FIG. 8. It is a figure for demonstrating arrangement | positioning of the battery module in the battery pack of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In this specification and the drawings, components having the same function are denoted by the same reference numeral, and redundant description may be omitted.

(External structure of battery pack 1)
FIG. 1 is a diagram schematically showing an external appearance of a battery pack 1 according to an embodiment of the present invention. The battery pack 1 includes a rectangular parallelepiped casing 10, an SDSW (Service Disconnect Switch) 11 provided on one surface of the casing 10, and a connection terminal portion 12. The SDSW 11 is a switch for shutting off the high-voltage line when the pack case is opened and the internal maintenance is performed. The SDSW 11 can be manually operated from the outside of the battery pack 1 and switches conduction / interruption of the circuit. The housing 10 of the battery pack 1 has a rectangular parallelepiped shape having long sides, short sides, and thickness. The long side direction is the x-axis direction, the thickness direction is the y-axis direction, and the short side direction is the z-axis direction.

  FIG. 2 is a diagram schematically showing the configuration of the bottom surface of the battery pack 1 of FIG. The battery pack 1 has an explosion-proof valve 13, a charging connector 14, and a fixed frame 15 on the installation surface 10 a that is the bottom surface. The fixed frame 15 is configured by columns 151 and 153 of the housing 10 in the y-axis direction and a frame portion 152 arranged between the columns 151 and 153. The columns 151 and 153 and the frame body 152 are fixed to the housing 10 by welding or the like. As a result, the fixed frame 15 has higher rigidity than the other parts of the housing 10. The frame portion 152 of the fixed frame 15 is provided so as to surround the charging connector 14 and fixes the charging connector 14 to the housing 10. A charging facility (not shown) is connected to the charging connector 14 every time charging is performed. At this time, the battery pack 1 is placed on the charging port of the charging facility for charging, so that the charging connector 14 is connected to the charging device. It takes its own weight. Therefore, the fixed frame 15 reinforces the charging connector 14 so as to withstand repeated loads. Further, by providing the explosion-proof valve 13 near the fixed frame 15, damage of the explosion-proof valve 13 can be reduced.

  The detailed structure of the explosion-proof valve 13 is shown in FIG. The explosion-proof valve 13 has a flat disk shape as a whole. The explosion-proof valve 13 includes an explosion-proof valve case 31, an O-ring 32, a ventilation film 33, and a protector 34. The explosion-proof valve case 31 has an annular shape and is made of synthetic resin. The O-ring 32 is a sealing member that seals between the explosion-proof valve case 31 and the case 10 of the battery pack 1 to which the explosion-proof valve case 31 is attached. The ventilation membrane 33 is a circular sheet attached to the explosion-proof valve case 31 so as to close the central opening of the explosion-proof valve case 31. The protector 34 has a circular plate shape and is made of synthetic resin. When the gas suddenly generates and the internal pressure of the pack case of the battery pack 1 suddenly rises, the fragile gas permeable membrane 33 is easily deformed or broken (or the adhesive is peeled off), and the internal pressure is directly applied to the protector 34. To work. The plate-shaped protector 34 has a slit 35 with low rigidity, and when pressure is applied, the protector 34 bends and deforms along the slit 35 so as to bend. With such a deformation, the two locking projections 36 provided in the direction orthogonal to the slit 3 move inward with respect to each other and come off from the locking recess 37 of the explosion-proof valve case 31. Therefore, the protector 34 is instantaneously dropped due to the pressure difference, and the central opening of the explosion-proof valve case 31 is entirely opened.

  As shown in FIG. 4, the battery pack 1 can be installed between the driver's seat 2 and the loading platform 3 of the vehicle 100. When the battery pack 1 is installed between the driver's seat 2 and the loading platform 3, the size of the battery pack 1 in the width direction and the height direction of the vehicle 100 does not exceed the width and height of the vehicle 100. Does not affect the overall size. However, the size of the battery pack 1 in the front-rear direction of the vehicle 100 affects the length of the vehicle 100. Therefore, the shortest thickness direction (y-axis direction) of the long side direction (x-axis direction), short-side direction (z-axis direction) and thickness direction (y-axis direction) of the battery pack 1 is the front-back direction of the vehicle 100. It is preferable to install the battery pack 1 so that Since the SDSW 11 is a switch that is manually operated as described above, it is preferable that the SDSW 11 is provided at a position where the operator can easily operate it, for example, on the surface of the housing 10 that is the side surface side of the vehicle 100. Therefore, the y-axis direction that is the thickness direction is the front-back direction of the vehicle 100, and the z-axis direction that is the short-side direction is the vertical direction of the vehicle 100.

(Circuit configuration of battery pack 1)
FIG. 5 is a diagram showing a circuit configuration of the battery pack 1. Referring to FIG. 5, vehicle 100 includes a tire 51, a motor 52, an inverter 53, a VCM (Vehicle Control Module) 54, and a battery pack 1.

  The inverter 53 converts DC power from the battery pack 1 into AC power. The inverter 53 supplies the AC power obtained by the conversion to each unit of the vehicle 100 such as the motor 52. The motor 52 drives the tire 51 of the vehicle 100 using the supplied electric power. The tire 51 supports the vehicle body 50 of the vehicle 100. The vehicle 100 has a plurality of tires 51, and when the motor 52 rotates the axle connected between the two tires 51, the tires 51 rotate. The VCM 54 is an example of a vehicle integrated controller. The VCM 54 is connected to the battery pack 1, the motor 52, the inverter 53, etc. by a communication line. The VCM 54, for example, drives the vehicle 100 and the battery pack based on a signal for detecting the state of the motor 52 / inverter 53, a signal from a sensor (not shown) for detecting the state of the vehicle, and information notified from the battery pack 1. The entire vehicle 100 is controlled such as charging 1.

  The battery pack 1 includes an SDSW 11, a connection terminal portion 12, a charging connector 14, a battery group 16, a junction box 17, a current sensor 41, and a BMS (Battery Management System) 42.

  The SDSW 11 has a switch 48 and a fuse 49. The switch 48 switches conduction / interruption of the circuit according to a manual operation from the outside of the housing 10. The fuse 49 is a safety device that is cut off when a current of a predetermined threshold value or more is applied.

  The connection terminal unit 12 has a high-voltage terminal 121 to which a high-voltage harness for connecting to the inverter 53 is connected, a low-voltage terminal 122 that is a vehicle communication terminal connected to the VCM 54, and the vehicle body 50 and the battery pack 1 at the same potential. In order to do so, it has a vehicle body connection terminal 123 that connects the vehicle body 50 and the housing 10 of the battery pack 1.

  The charging connector 14 is a connector that connects to a charging facility 60 for charging the battery pack 1. The charging connector 14 has a high-voltage terminal 141 for connecting the high-voltage harness 18 and a low-voltage terminal 142 for connecting a communication line.

  The battery group 16 has battery stack parts 160a and 160b. The battery stack portion 160a has a positive electrode side terminal 1601 and a negative electrode side terminal 1602, and the battery stack portion 160b has a positive electrode side terminal 1603 and a negative electrode side terminal 1604. The battery stack parts 160a and 160b are connected in series in the example of FIG. 5, and the negative electrode side terminal 1602 of the battery stack part 160a and the positive electrode side terminal 1603 of the battery stack part 160b are the terminals of the battery group 16. The positive electrode side terminal 1601 of the battery stack portion 160a is connected to the SDSW 11 via the high-power harness 18d. The negative electrode side terminal 1604 of the battery stack portion 160b is connected to the SDSW 11 via the high-power harness 18g. As a result, the positive electrode side terminal 1601 of the battery stack portion 160a and the negative electrode side terminal 1604 of the battery stack portion 160b are connected via the high-voltage harness 18d, the SDSW 11 and the high-voltage harness 18g.

  The junction box 17 has a relay arranged in the middle of the high-power harness 18. Specifically, the junction box 17 has a negative relay 43, a positive relay 44, a precharge relay 45, a precharge resistor 46, and a fuse 47. One end of the negative relay 43 is connected to the negative electrode side terminal 1602 of the battery stack portion 160a via the high-power harness 18h. The other end of the negative relay 43 is connected to the high voltage terminal 141 of the charging connector 14 via the high voltage harness 18e, and is connected to the high voltage terminal 121 of the connection terminal portion 12 via the high voltage harness 18f. As a result, the negative relay 43 is interposed between the negative electrode side terminal 1602 of the battery stack portion 160a and the high voltage terminal 141 and between the negative electrode side terminal 1602 and the high voltage terminal 121, and the output circuit is electrically connected / disconnected. Switch off. One end of the positive relay 44 is connected to the positive electrode side terminal 1603 of the battery stack portion 160b via the high-power harness 18c. The other end of the positive relay 44 is connected to the high voltage terminal 141 of the charging connector 14 via the high voltage harness 18a, and is connected to the high voltage terminal 121 of the connection terminal portion 12 via the high voltage harness 18b. As a result, the positive relay 44 is interposed between the positive electrode side terminal 1603 and the high voltage terminal 141 of the battery stack portion 160b, and between the positive electrode side terminal 1603 and the high voltage terminal 121, and the output circuit becomes conductive. / Switch the block. The precharge relay 45 and the precharge resistor 46 are connected in parallel with the positive relay 44 to form a bypass path. The negative relay 43, the positive relay 44, and the precharge relay 45 are connected to the BMS 42 by a communication line. The BMS 42 controls switching between conduction / cutoff of the negative relay 43, the positive relay 44, and the precharge relay 45. The fuse 47 has one end connected to the positive relay 44 and the precharge resistor 46, and the other end connected to the charging connector 14 via the high-power harness 18a. The fuse 47 is a safety device that is cut off when a current of a predetermined threshold value or more is applied.

  The current sensor 41 detects a current. The current sensor 41 is connected to the BMS 42 via a communication line and notifies the BMS 42 of the detected current. The current sensor 41 is inserted in a high-power harness 18h that connects the junction box 17 and the negative electrode side terminal 1602 of the battery stack portion 160a.

  The BMS 42 is a control unit that controls the battery pack 1. The BMS 42 is connected to each unit in the battery pack 1 by a communication line, and is connected to the VCM 54 via a connection terminal unit 12 by a communication line.

  The BMS 42 can control each relay in the junction box 17. Specifically, the BMS 42 shuts off the positive relay 44 and brings the precharge relay 45 and the negative relay 43 into conduction when the battery pack 1 is activated. As a result, the precharge resistor 46 is interposed in the middle of the circuit at the start of power supply, so that the supply current is suppressed so that an excessive current does not flow. When the battery voltage exceeds a predetermined threshold value, the BMS 42 turns on the positive relay 44 and turns off the precharge relay 45 while keeping the negative relay 43 turned on.

(Physical configuration of battery pack 1)
FIG. 6 is a diagram for explaining the physical configuration of the battery pack 1 shown in FIG. The battery pack 1 has a plurality of battery modules 161. The plurality of battery modules 161 form battery stacks 160a and 160b that are stacked so that the thickness direction (x-axis direction) is parallel to the installation surface 10a that is the bottom surface of the housing 10. The battery stacks 160a and 160b are stacked in two stages in a direction (z-axis direction) perpendicular to the installation surface 10a of the housing 10, and are fixed to the housing 10 by support frames 19a and 19b. The support frame 19a extends in a direction (x-axis direction) parallel to the installation surface 10a, and has ends of the battery stacks 160a and 160b in a direction (z-axis direction) perpendicular to the installation surface 10a. To support. The support frame 19b extends in the direction perpendicular to the installation surface 10a (z-axis direction) and supports the ends of the battery stacks 160a and 160b in the direction parallel to the installation surface 10a (x-axis direction). The junction box 17 is arranged in the housing 10 alongside the battery stacks 160a and 160b in the thickness direction (x-axis direction) of the battery module 161. With this configuration, it is possible to suppress an increase in thickness in the y-axis direction.

  Further, as described with reference to FIG. 2, the charging connector 14 is provided on the installation surface 10 a of the housing 10. The charging connector 14 is fixed to a position closer to the relay than the center P of the width I of the battery stacks 160a and 160b in the x-axis direction (the thickness direction c of the battery module 161 and the battery cell 21 described later). A displacement amount D between the center P of the battery stacks 160a and 160b and the center of the fixed frame portion 15 is, for example, 50 mm. With this configuration, the length of the high-power harnesses 18a and 18e that connect the charging connector 13 and the junction box 17 can be shortened, and the cost and weight can be reduced.

  7 to 11 are diagrams for explaining the detailed configurations of the battery stack units 160a and 160b. FIG. 7 is a perspective view showing an external configuration of the battery module 16 included in the battery stack unit 160a. In this embodiment, the battery included in the battery stack unit 160a is the battery module 161. The battery module 161 has a short side, a long side, and a thickness. In this figure, the short side direction is the a-axis direction, the long side direction is the b-axis direction, and the thickness direction is the c-axis direction. The three terminals 163a to 163c are arranged side by side on one surface 162a of the housing 162 of the battery module 161 and at the end surface 162a in the long side direction. Holes 164a to 164c are formed in the central portions of the three terminals 163a to 163c, respectively. The holes 164a and 164b are bolt type holes for connecting to a bus bar described later, and the hole 164c is a hole for inserting a measuring probe for measuring an intermediate potential.

  FIG. 8 is a diagram showing an external configuration of the battery cell 21 housed in the housing 162 of the battery module 161. The battery cell 21 has a battery element in which a plurality of rectangular positive electrode plates and negative electrode plates are alternately stacked with rectangular separators interposed therebetween, and is, for example, a lithium ion secondary battery. The battery element is housed in, for example, an exterior body 22 in which two rectangular laminate films are stacked and heat-sealed around the periphery, and one short side of the exterior body 22 (one end in the b-axis direction that is the long side direction). The positive electrode tab 23 and the negative electrode tab 24 are drawn out so as to project to the outside of the exterior body 22.

  In the present embodiment, each battery module 161 shown in FIG. 7 has four battery cells 21. As shown in FIG. 9, the four battery cells 21 are connected in series by connecting two of them in parallel.

  FIG. 10 is an exploded perspective view of the battery module 161. However, the side from which the tabs 23 and 24 project is not shown. Inside the battery module 161, a plurality of battery cells 21 are sequentially stacked via spacers 25 arranged at both ends in the long side direction (b-axis direction). The spacer 25 has cylindrical columnar portions 26 at both ends. The spacers 25 hold the battery cells 21 such that the plurality of battery cells 21 are arranged at intervals by fitting the columnar portions 26 to each other.

  FIG. 11 is a diagram for explaining the arrangement of the battery modules 161 included in the battery stack unit 160a in FIG. Although the battery stack section 160a is shown in this figure, the same applies to the battery stack section 160b.

  Each of the plurality of battery modules 161 has a long side, a short side, and a thickness, and is stacked in the thickness direction (c-axis direction). The plurality of stacked battery modules 161 are arranged such that the c-axis direction, which is the thickness direction, is aligned with the x-axis direction in the battery pack 1. The plurality of battery modules 161 are arranged so that the a-axis direction, which is the short side direction, is aligned with the y-axis direction in the battery pack 1. The plurality of battery modules 161 are adjacent to each other such that the surfaces 162a of the ends in the long side direction of the battery modules 161 are arranged in the same direction and the terminals 163a and 163b are alternately arranged in the x-axis direction. The directions of the 161 are staggered (the directions of the a-axis are staggered). A pair of terminals 163a and terminals 163b, which are alternately arranged in the x-axis direction, are connected by a bus bar 20. This bus bar 20 is connected to terminals 163a and 163b using holes 164a and 164b shown in FIG. 7 using a conductive bolt (not shown). At this time, since the battery modules 161 are connected in series, the terminals 163b (1602) not connected to the other terminals 163a and the terminals 163a (1601) not connected to the other terminals 163a are provided at both ends of the battery stack portion 160a. And are left one by one. The terminals 163a (1601) and 163b (1602) function as terminals as the battery stack section 160a and are connected to the SDSW 11 or the junk box 17, respectively. Further, the plurality of battery modules 161 are sandwiched and fixed by the two support frames 19a extending in the x-axis direction of the battery pack 1. The support frame 19 a is fixed to a support frame 19 b extending in the z-axis direction of the battery pack 1, and the support frame 19 b is fixed to the housing 10 of the battery pack 1. With this configuration, the short side direction of the battery module 161 is parallel to the installation surface 10a and is the y-axis direction in the battery pack 1, and the long side direction of the battery module 161 is a direction perpendicular to the installation surface 10a and z. Axial direction.

  Although the present invention has been described with reference to the exemplary embodiments, the present invention is not limited to the above exemplary embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the technical idea of the present invention.

  For example, in the above embodiment, the batteries of the battery pack are stored in the housing 10 in the form of the battery module 16 including a plurality of battery cells 21, but the present invention is not limited to this example. For example, the battery may be housed in the housing 10 in the form of a battery cell 21.

  Further, in the above embodiment, the battery stacks are stacked in two stages and housed in the housing 10, but the present invention is not limited to this example. The battery stacks may be stacked in three or more stages in a direction perpendicular to the installation surface 10a of the housing 10.

  Further, in the above-described embodiment, the battery pack 1 has the upper battery stack portion 160a and the lower battery stack portion 160b, but the present invention is not limited to this example. For example, a plurality of battery stack units may be arranged in each of the upper and lower stages. For example, two battery stack units can be arranged in each of the upper and lower stages.

  Further, in the above-described embodiment, the tabs 23 and 24 are provided on the short sides of the battery cell 21, but the present invention is not limited to this example. The tabs 23 and 24 may be provided on the long sides of the battery cell 21. In this case, it is desirable that the terminal 163 be provided on the long side of the battery module 161 and that the battery module 161 be arranged such that the long side is parallel to the installation surface 10a.

  Further, in the above embodiment, the two battery stacks 160a and 160b are connected in series, but the present invention is not limited to this example. For example, the two battery stacks 160a and 160b may be connected in parallel.

  Further, in the above embodiment, the battery cells 21 housed inside the battery module 161 are connected in two rows and two columns, but the present invention is not limited to this example. For example, four battery cells 21 inside the battery module 161 may be connected in series.

(effect)
As described above, the battery pack 1 according to the above-described embodiment of the present invention is provided with a plurality of battery stack portions 160a and 160b, a housing 10 that houses the plurality of battery stack portions 160a and 160b, and a housing 10. The connection terminal portion 12 is provided. The connection terminal portion 12 is connected to terminals 1602 and 1603 as the battery group 16 to which the battery stack portions 160a and 160b are connected by a high-power harness 18. Relays 43 and 44 included in the junction box 17 are provided in the middle of the high-power harness 18. Further, the battery stack parts 160a and 160b each have a plurality of battery modules 161 each having a long side, a short side and a thickness, and the plurality of battery modules 161 are stacked in the thickness direction of each battery module 161 to form a battery stack. The parts 160a and 160b are configured. The battery stack parts 160a and 160b are stacked in a plurality of stages in a direction perpendicular to the installation surface 10a. The relays 43 and 44 included in the junction box 17 are arranged in the housing 10 side by side with the battery stack parts 160a and 160b in the thickness direction of each battery module 161.

  With the above configuration, the plurality of battery stack parts 160a and 160b in which the plurality of battery modules 161 are stacked are stacked in a plurality of stages in a direction perpendicular to the installation surface 10a. Further, the battery stack parts 160a and 160b and the junction box including the relays 43 and 44 are arranged side by side in the direction parallel to the installation surface 10a and in the direction in which the battery modules 161 are stacked. Therefore, the length of the battery pack 1 in the y-axis direction can be reduced as compared with the case where the relays 43 and 44 are arranged side by side with the battery stack parts 160a and 160b in the y-axis direction of the battery pack 1. Therefore, even when the capacity is increased, the size of the installation surface 10a can be suppressed from increasing in the y-axis direction, and the installation area of the battery pack 1 can be suppressed from increasing. The battery module 161 is arranged so that the short-side direction or the long-side direction is the y-axis direction. However, when the battery module 161 is arranged so that the short-side direction is the y-axis direction, the installation surface 10a in the y-axis direction can be arranged further. It is possible to suppress the increase in size.

  According to the above-described embodiment, the terminal provided on the housing 10 is a terminal provided on the installation surface 10 a of the housing 10, and the charging connector 14 that is connected to the charging facility 60 for charging the battery module 161. including. The charging connector 14 is fixed to a position closer to the relays 43, 44 than the center P of the battery stacks 160a and 160b in the thickness direction c. With this configuration, the length of the high-power harnesses 18a and 18e that connect the charging connector 14 and the junction box 17 can be shortened. Therefore, cost reduction and weight reduction can be achieved.

  According to the above-described embodiment, each of the battery modules 161 has a long side, a short side, and a thickness, and the battery stack parts 160a and 160b are arranged such that the long side direction of each battery module 161 is the installation surface 10a of the housing 10. It is arranged so as to be a direction perpendicular to. In this case, as described above, as compared with the case where the battery module 161 is installed so that the short side direction is perpendicular to the installation surface 10a, the size of the installation surface 10a in the y-axis direction is smaller. It is possible to suppress the increase. Therefore, it is possible to further suppress an increase in the installation area of the battery pack 1.

  According to the above-described embodiment, each of the battery modules 161 has terminals 163a and 163b provided at the ends of the housing 10 in the direction perpendicular to the installation surface 10a. The terminals 163a and 163b of the battery module 161 are connected to the terminals 163a and 163b of the battery modules 161 that are stacked adjacently inside the battery stack portions 160a and 160b, respectively. With this configuration, the terminals 163a and 163b do not project in the y-axis direction of the battery pack 1, so that it is possible to further suppress an increase in the size of the installation surface 10a in the y-axis direction.

  According to the above embodiment, the battery pack 1 further includes the explosion-proof valve 13 for lowering the internal pressure of the housing 10 when the internal pressure rises. The explosion-proof valve 13 is provided on the installation surface 10 a of the housing 10. With this configuration, even if the explosion-proof valve 13 is opened and the gas is discharged to the outside of the housing 10 when the internal pressure of the housing 10 rises, the gas is discharged from the installation surface 10a and is therefore discharged to the road surface side. It is possible to reduce the possibility that gas will be discharged to the side where an operator or a passerby exists.

  According to the above-described embodiment, the battery pack 1 further includes the fixed frame portion 15 for fixing the charging connector 14 to the housing 10, and the explosion-proof valve 13 is arranged near the fixed frame portion 15. With this configuration, even when the charging connector 14 is repeatedly connected to and disconnected from the charging facility 60, it is possible to reduce the possibility that the explosion-proof valve 13 is damaged by the impact.

  According to the above-described embodiment, the battery included in the housing 10 is the battery module 16 including the plurality of battery cells 21, and the battery cell 21 is a flat battery cell including the exterior body 20 using a rectangular laminate film. Is. In each battery module 16, the plurality of battery cells 21 are stacked in the thickness direction of each battery cell 21.

  According to the above embodiment, the battery stack parts 160a and 160b are arranged such that the long side direction is perpendicular to the bottom surface 10a of the housing 10. With this configuration, since the length becomes longer in the height direction perpendicular to the bottom surface 10a, it is possible to suppress an increase in the area of the bottom surface 10a even when the number of stacked battery stacks is increased to increase the capacity. Therefore, even if the capacity is increased, it is possible to suppress an increase in installation area.

  According to the above-described embodiment, the battery pack 1 is mounted on the vehicle 100 having the luggage carrier section 3 and the driver's seat section 2, and the thickness direction of each battery module 161 is perpendicular to the traveling direction of the vehicle 100. It is arranged between the cargo bed section 3 and the driver's seat section 2. As a result, the length of the vehicle in the traveling direction can be shortened, and the battery pack 1 can be mounted on the vehicle 100 by utilizing a slight gap between the luggage carrier section 3 and the driver's seat section 2.

  Although the long side direction or the short side direction of each battery module 161 overlaps with the traveling direction of the vehicle 100, in any case, the length in the traveling direction of the vehicle 100 should be shorter than that of the conventional technique. You can When the battery module 161 is arranged such that the short side direction of the battery module 161 overlaps the traveling direction of the vehicle 100, the length of the vehicle 100 in the traveling direction can be further shortened.

  Further, the battery (the battery cell 21, the battery module 161, the battery stacks 160a and 160b, or the battery group 16), the housing 10 that houses the battery, and the explosion-proof for lowering the internal pressure of the housing 10 when the internal pressure rises. In the battery pack 1 that has the valve 13, the explosion-proof valve 13 is provided on the installation surface 10a that is the bottom of the battery pack 1, and the installation surface 10a faces the lower side (road surface side) of the vehicle body. Even if the explosion-proof valve 13 is opened and the gas is discharged to the outside of the housing 10 when the internal pressure of the housing 10 rises, the gas is discharged from the installation surface 10a, so that the gas is discharged to the road side and the presence of human beings. It is possible to reduce the possibility that the gas will be discharged to the side where it is discharged.

DESCRIPTION OF SYMBOLS 1 Battery pack 2 Driver's seat part 3 Cargo bed part 10 Housing 10a Installation surface 13 Explosion-proof valve 14 Charging connector 15 Fixed frame part 16 Battery group 17 Junction box 18 High-power harness 43 Negative relay 44 Positive relay 45 Precharge relay 160a, 160b Battery stack 161 Battery module (battery)

Claims (7)

A plurality of battery stacks in which a plurality of batteries are stacked in the thickness direction of each battery,
A housing containing the plurality of battery stacks,
A harness that connects terminals provided on the housing and terminals of a battery group that connects the plurality of battery stacks,
With a relay routed in the middle of the harness,
The plurality of battery stacks are stacked in a plurality of stages in a direction perpendicular to the installation surface of the housing so that the thickness direction is parallel to the installation surface of the housing.
The relay is arranged side by side with the battery stack in the thickness direction in the housing,
Further comprising an explosion-proof valve for lowering the internal pressure when the internal pressure of the housing rises,
The explosion-proof valve is a battery pack provided on the installation surface of the housing.   Each of the plurality of batteries has a terminal provided at an end portion in a direction perpendicular to the installation surface of the housing, and the terminals of the battery are adjacent to each other in the battery stack. The battery pack according to claim 1, which is connected to the terminal. The terminal provided on the housing is a terminal provided on the installation surface of the housing and includes a charging connector that is connected to charging equipment for charging the battery,
Further comprising a fixed frame portion for fixing the charging connector to the housing,
The fixed frame portion has higher strength than the casing,
The battery pack according to claim 1 or 2, wherein the explosion-proof valve is arranged near the fixed frame portion. The battery is a battery module including a plurality of battery cells,
The battery pack according to any one of claims 1 to 3, wherein a plurality of battery cells are stacked in a thickness direction of each battery cell in each battery module. The battery includes a plurality of battery cells, the battery cell is a flat battery cell having an exterior body using a rectangular laminate film,
The battery pack according to any one of claims 1 to 4, wherein the battery cells are stacked in a thickness direction of the battery cells.   The battery pack is mounted on a vehicle having a cargo bed section and a driver's seat section, and is arranged between the cargo bed section and the driver's seat section so that the thickness direction is perpendicular to the traveling direction of the vehicle. The battery pack according to claim 1, further comprising: Each of the plurality of batteries has a long side, a short side and a thickness,
The battery stack is arranged such that the long side direction of each battery is a direction perpendicular to the installation surface,
The battery pack according to claim 6, wherein the battery pack is arranged between the luggage carrier part and the driver's seat part so that a short side direction of each battery overlaps a traveling direction of the vehicle.

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