JP2013187124A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a power storage stack against collision while suppressing increase in size of a power storage device.SOLUTION: The power storage device includes a first power storage stack including a plurality of power storage elements arranged side-by-side in the longitudinal direction of a vehicle, and having a fixing bracket for fixing these power storage elements projecting downward, and a second power storage stack including a plurality of power storage elements arranged side-by-side in the vehicle width direction and a dummy power storage element not having a power storage function, and arranged below the first power storage stack. The dummy power storage element adjoins the fixing bracket in the longitudinal direction of a vehicle.

Description

  The present invention relates to a power storage device including a plurality of power storage stacks configured of a plurality of power storage elements.

  A battery pack having a plurality of battery stacks may be mounted on a vehicle or the like. The battery stack is configured by arranging a plurality of single cells in one direction, and outputs energy used for running the vehicle. When a plurality of battery stacks are used, the plurality of battery stacks are arranged side by side in the same plane. Since the unit cell includes a power generation element, it is necessary to protect the unit cell from collision when vibration or impact is applied to the cell stack.

  Here, when the unit cell and the vehicle structure are adjacent to each other in the front-rear direction of the vehicle, the interval between the unit cell and the vehicle structure may be increased in order to avoid a collision between the unit cell and the vehicle structure.

JP 2010-123365 A JP 61-101964 A JP 2009-026703 A

  However, the above-described method may increase the size of the battery pack. Therefore, an object of the present invention is to protect a power storage stack from a collision while suppressing an increase in size of the power storage device.

  A power storage device according to the present invention includes a plurality of power storage elements arranged side by side in a vehicle front-rear direction, a first power storage stack in which a fixing bracket for fixing these power storage elements protrudes downward, A plurality of power storage elements arranged side by side in the width direction and a dummy power storage element that does not have a power storage function, and a second power storage stack disposed below the first power storage stack, the dummy The power storage element is adjacent to the fixed bracket in the vehicle front-rear direction.

  ADVANTAGE OF THE INVENTION According to this invention, an electrical storage stack can be protected from a collision, suppressing the enlargement of an electrical storage apparatus.

It is a side view of the vehicle provided with the battery pack. It is an external view of a battery pack. It is the schematic when a battery pack and a floor panel are seen from the front of vehicles. It is an exploded view of a battery pack. It is an exploded view of a lower case. It is an exploded view of a battery stack. It is an external view which shows the fixing structure of a battery stack. It is an external view explaining the internal structure of a battery pack. It is an external view explaining the internal structure of a battery pack. It is a top view of an intake duct and a branch duct. It is a side view of an intake duct and a branch duct. It is an external view explaining the internal structure of a battery pack. It is sectional drawing of the battery stack arrange | positioned at an upper stage. It is the schematic of the battery stack in planar view.

  Examples of the present invention will be described below.

  A battery pack (corresponding to a power storage device) that is an embodiment of the present invention will be described. First, the vehicle provided with the battery pack of the present embodiment will be described with reference to FIG. FIG. 1 is a side view of a vehicle and mainly shows a battery pack and a mechanism for adjusting the temperature of the battery pack. The arrow UP shown in FIG. 1 indicates the upward direction of the vehicle, and the arrow FR indicates the forward direction of the vehicle.

  The vehicle 100 of the present embodiment has a floor panel 101, and the battery pack 1 is attached to the lower surface of the floor panel 101. Since the upper surface of the floor panel 101 forms a part of the passenger compartment, the battery pack 1 is disposed outside the passenger compartment. The passenger compartment is a space where passengers get on. Floor panel 101 is a part of the body of vehicle 100.

  Examples of the vehicle 100 on which the battery pack 1 is mounted include a hybrid vehicle and an electric vehicle. The hybrid vehicle is a vehicle provided with an internal combustion engine or a fuel cell in addition to the battery pack 1 as a power source for running the vehicle 100. The electric vehicle is a vehicle including only the battery pack 1 as a power source of the vehicle 100.

  The battery pack 1 is connected to a motor / generator (not shown), and the motor / generator receives the output of the battery pack 1 and generates kinetic energy for running the vehicle 100. The rotational force of the motor / generator is transmitted to the wheels via a power transmission mechanism.

  A booster circuit or an inverter can be arranged between the battery pack 1 and the motor / generator. If the booster circuit is arranged, the output voltage of the battery pack 1 can be boosted. If an inverter is used, DC power output from the battery pack 1 can be converted into AC power, and a three-phase AC motor can be used as a motor generator. The motor / generator converts kinetic energy generated during braking of the vehicle 100 into electric energy and outputs the electric energy to the battery pack 1. The battery pack 1 stores electric power from the motor / generator.

  An intake duct 102 is connected to the battery pack 1, and the intake duct 102 is disposed in front of the vehicle 100 with respect to the battery pack 1. An intake port 102a is provided at one end of the intake duct 102, and air is taken in from the intake port 102a. The other end 102 b of the intake duct 102 is connected to the battery pack 1.

  The blower 103 is provided in the intake duct 102, and the air moves from the intake port 102 a of the intake duct 102 toward the battery pack 1 by driving the blower 103. In this embodiment, the blower 103 is provided in the intake duct 102, but the present invention is not limited to this. Air only needs to flow from the air inlet 102a of the air intake duct 102 toward the battery pack 1. For example, a blower 103 can be provided in the exhaust duct 106 described later.

  The air cleaner 104 is provided in the intake duct 102 and purifies the air taken in from the intake port 102a of the intake duct 102. Specifically, the air cleaner 104 removes foreign matters contained in the air using a filter. The blower 103 and the air cleaner 104 are arranged in a space provided in front of the vehicle 100 with respect to the dashboard 105. If the vehicle 100 is an automobile equipped with an engine, this space corresponds to an engine room.

  The air guided from the intake duct 102 to the battery pack 1 passes through the inside of the battery pack 1 and then enters the exhaust duct 106. When the air passes through the inside of the battery pack 1, the temperature of the battery pack 1 can be adjusted. For example, the battery pack 1 can be cooled by removing the heat of the battery pack 1 by air. The flow of air inside the battery pack 1 will be described later.

  One end 106 a of the exhaust duct 106 is connected to the battery pack 1. An exhaust port 106 b is formed at the other end of the exhaust duct 106. The other end side of the exhaust duct 106 is disposed inside the rear bumper case 107. The air discharged from the exhaust port 106b moves to a space formed inside the rear bumper case 107.

  Next, the configuration of the battery pack 1 will be described. FIG. 2 is an external view of the battery pack 1. FIG. 3 is a schematic diagram when the battery pack 1 and the floor panel 101 are viewed from the front of the vehicle 100. FIG. 4 is an exploded view of the battery pack 1. An arrow RH shown in FIG. 2 indicates the right direction when facing the forward direction FR of the vehicle 100, and an arrow LH shown in FIG. 4 indicates the left direction when facing the forward direction FR of the vehicle 100.

  The battery pack 1 includes five battery stacks (corresponding to power storage stacks) 11 to 15 and a pack case 20 that houses the battery stacks 11 to 15. A plurality of fastening portions 20 a are provided on the outer edge of the pack case 20, and the fastening portions 20 a are used for fixing the battery pack 1 to the floor panel 101.

  A protrusion 20 b is formed on the upper surface of the pack case 20. The projecting portion 20 b protrudes upward and extends in the front-rear direction of the vehicle 100. As shown in FIG. 3, the upper surface of the pack case 20 is disposed along the floor panel 101. The floor panel 101 has a center tunnel 101a.

  The center tunnel 101a protrudes upward and extends in the front-rear direction of the vehicle 100. The center tunnel 101a is provided between the driver seat and the passenger seat in the left-right direction of the vehicle 100. A protrusion 20b of the pack case 20 is located inside the center tunnel 101a. An opening 20c is formed on the upper surface of the pack case 20, and the opening 20c is provided for passing a current breaker described later.

  As shown in FIG. 4, the battery pack 1 has five battery stacks 11 to 15, and the battery stacks 11 to 15 are covered with an upper case 21 and a lower case 22. The upper case 21 is fixed to the lower case 22 by a plurality of bolts 23. The upper case 21 can be formed using, for example, a resin containing glass fiber.

  The battery stacks 11 to 14 extend in the left-right direction of the vehicle 100, and the four battery stacks 11 to 14 are arranged in the front-rear direction of the vehicle 100. Above the four battery stacks 11 to 14 (corresponding to the second power storage stack), a battery stack (corresponding to the first power storage stack) 15 is arranged, and the battery stack 15 is arranged in the front-rear direction of the vehicle 100. It extends. The battery stack 15 is disposed at a position corresponding to the protrusion 20 b of the pack case 20. That is, the battery stack 15 is located inside the center tunnel 101a.

  As illustrated in FIG. 5, the lower case 22 includes a lower carrier 221 and a frame (corresponding to a reinforcing frame) 222. The battery stacks 11 to 15 are fixed to the lower carrier 221. The lower carrier 221 is fixed to the frame 222 by a plurality of bolts 24. The lower carrier 221 can be formed using, for example, a resin containing glass fiber. The frame 222 can be formed using a metal such as iron. The frame 222 is used to ensure the strength of the lower case 22 and has reinforcements 222 a and 222 b that extend in the left-right direction of the vehicle 100. The frame 222 is fixed to the floor panel 101.

  Next, the structure of each battery stack 11-15 is demonstrated. FIG. 6 is an exploded view of the battery stack 11. The battery stack 11 includes a plurality of single cells (corresponding to power storage elements) 11A arranged side by side in one direction and a plurality of dummy single cells 11B indicated by hatching. A so-called square unit cell is used as the unit cell 11A. As illustrated in FIG. 14, the battery stack 12 includes a plurality of single cells 12A and a plurality of dummy single cells 12B arranged in one direction. As illustrated in FIG. 14, the battery stack 13 includes a plurality of single cells 13A and a plurality of dummy single cells 13B arranged in one direction. As illustrated in FIG. 14, the battery stack 14 includes a plurality of unit cells 14 </ b> A arranged in one direction and a plurality of dummy unit cells 14 </ b> B.

  In this embodiment, the number of unit cells constituting each of the battery stacks 11 to 15 is different from each other. The number of unit cells constituting the battery stacks 11 to 15 can be set as appropriate. In the present embodiment, the number of unit cells constituting the battery stacks 11 to 15 is set based on the shape of the lower case 22. Further, a partition plate is disposed between two adjacent unit cells 11A. The partition plate is formed of an insulating material (for example, resin) and is used to form a space on the surface of the unit cell 11A.

  As the unit cell 11A, a secondary battery such as a nickel metal hydride battery or a lithium ion battery can be used. Moreover, an electric double layer capacitor (capacitor) can be used instead of the secondary battery. In the battery stacks 11 to 15 of the present embodiment, a plurality of single cells are arranged in one direction, but the present invention is not limited to this. Specifically, one battery module can be configured using a plurality of single cells, and the plurality of battery modules can be arranged in one direction.

  A power generation element is housed inside the unit cell 11A. The power generation element is an element that can be charged and discharged. The power generation element can be composed of, for example, a positive electrode element, a negative electrode element, and a separator (including an electrolytic solution) disposed between the positive electrode element and the negative electrode element. In the positive electrode element, a positive electrode active material layer is formed on the surface of a current collector plate. The negative electrode element is obtained by forming a negative electrode active material layer on the surface of a current collector plate.

  A positive electrode terminal 111a and a negative electrode terminal 111b are provided on the upper surface of the unit cell 11A. The positive electrode terminal 111a is electrically connected to the positive electrode element of the power generation element. The negative electrode terminal 111b is electrically connected to the negative electrode element of the power generation element. Two adjacent unit cells 11A are electrically connected by a bus bar.

  The dummy unit cell 12B has the same configuration as the unit cell 11A in that no power generation element is included. That is, the dummy unit cell 12B has the same outer dimensions as the unit cell 11A, and the strength in the arrangement direction is set to be the same as the unit cell 11A.

  In this embodiment, a bus bar module 110 in which a plurality of bus bars are integrally formed is used. The bus bar module 110 is disposed on the upper surface of the battery stack 11. The bus bar module 110 includes a plurality of bus bars and a holder for holding each bus bar. The holder is made of an insulating material (for example, resin). Each bus bar can be covered with an insulating cover (for example, a resin cover), and the cover can be attached to the holder.

  A pair of end plates 112 are disposed at both ends of the battery stack 11. The restraint band 113 extends in the arrangement direction of the plurality of single cells 11 </ b> A, and both ends of the restraint band 113 are fixed to the pair of end plates 112. Two restraint bands 113 are disposed on the upper surface of the battery stack 11, and two restraint bands 113 are also disposed on the lower surface of the battery stack 11.

  By fixing the restraining band 113 to the end plate 112, the pair of end plates 112 are displaced in a direction approaching each other. As a result, a binding force can be applied to the plurality of single cells 11 </ b> A sandwiched between the pair of end plates 112. A spacer is arranged between two adjacent unit cells 11A, and air can enter between two adjacent unit cells 11A.

  The intake chamber 114 and the exhaust chamber 115 are disposed on both side surfaces of the battery stack 11. Specifically, the intake chamber 114 and the exhaust chamber 115 are arranged at positions sandwiching the plurality of unit cells 11A in a direction orthogonal to the arrangement direction of the plurality of unit cells 11A. The intake chamber 114 has a connection port 114a, and air from the intake duct 102 enters the connection port 114a. The air that has moved to the inside of the intake chamber 114 enters a space formed between two adjacent unit cells 11A. Air moves from the intake chamber 114 toward the exhaust chamber 115.

  By performing heat exchange between the air and the unit cell 11A, the temperature of the unit cell 11A can be adjusted. When the unit cell 11A generates heat due to charging / discharging, the temperature of the unit cell 11A can be suppressed by air taking the heat of the unit cell 11A. The air that has passed between the two unit cells 11 </ b> A moves to the exhaust chamber 115. Exhaust ports 115a are provided at both ends of the exhaust chamber 115, and the air after heat exchange is exhausted from the exhaust ports 115a. The air discharged from the exhaust port 115a moves to a space formed between the upper case 21 and the lower case 22.

  The configuration of the battery stacks 12 to 15 is basically the same as the configuration of the battery stack 11. However, the number of unit cells constituting the battery stacks 11 to 15 is different from each other. Here, the plurality of single cells constituting each of the battery stacks 11 to 14 are arranged in the left-right direction of the vehicle 100, and the plurality of single cells constituting the battery stack 15 are arranged in the front-rear direction of the vehicle 100.

  As shown in FIG. 7, a bracket 116 is fixed to the end plate 112 of the battery stack 11 by bolts 117. As shown in FIG. 8, the bracket 116 is fixed to the lower case 22 by bolts 118. Thereby, the battery stack 11 is fixed to the lower case 22.

  The bracket 120 is used to fix the battery stack 12 to the lower case 22. Specifically, the bracket 120 is fixed to the pair of end plates of the battery stack 12 and is fixed to the lower case 22. The bracket 130 is used to fix the battery stack 13 to the lower case 22. Specifically, the bracket 130 is fixed to the pair of end plates of the battery stack 13 and is fixed to the lower case 22. The bracket 140 is used for fixing the battery stack 14 to the lower case 22. Specifically, the bracket 140 is fixed to the pair of end plates of the battery stack 14 and is fixed to the lower case 22.

  The lower case 22 has two ribs 22a and 22b. The ribs 22 a and 22 b protrude upward and extend in the left-right direction of the vehicle 100. The ribs 22a and 22b are configured by a part of the frame 222 (see FIG. 5). The battery stack 12 is mounted in the first region S1 located in front of the vehicle 100 with respect to the rib 22a. The battery stack 11 is mounted in the second region S2 located between the rib 22a and the rib 22b. Battery stacks 13 and 14 are mounted in the third region S3 located behind the vehicle 100 with respect to the rib 22b. Each of the battery stacks 11 to 14 is fixed to the lower case 22 using not only the brackets 116, 120, 130, and 140 but also the bracket 30 (see FIG. 12).

  As shown in FIGS. 9 and 10, four branch ducts 51 to 54 are connected to the intake duct 102. FIG. 9 is a diagram illustrating the arrangement of the branch ducts 51 to 54, and FIG. 10 is a top view of the branch ducts 51 to 54. As shown in FIG. 11, the branch duct 52 has a claw portion 52b, and the intake duct 102 has a concave portion 102c that engages with the claw portion 52b. The branch duct 52 can be fixed to the intake duct 102 by engaging the claw portion 52b and the recess 102c. FIG. 11 is a diagram when viewed from the direction of the arrow D1 in FIG.

  The branch ducts 51, 53, and 54 also have a claw portion corresponding to the claw portion 52 b of the branch duct 52 and engage with the concave portion 102 c of the intake duct 102. As a result, the branch ducts 51, 53, 54 can be connected to the intake duct 102. Air from the intake duct 102 moves to the four branch ducts 51 to 54. The arrow shown with the dotted line of FIG. 10 and FIG. 11 shows the moving direction of air.

  The connection port 51 a of the branch duct 51 is connected to the connection port 114 a of the intake chamber 114 provided in the battery stack 11. The branch duct 51 is connected to a side surface of the battery stack 11 located on the front side of the vehicle 100. The air in the branch duct 51 is supplied to the unit cells 11 </ b> A of the battery stack 11. The connection port 52 a of the branch duct 52 is connected to the intake chamber of the battery stack 12, and the air of the branch duct 52 is supplied to the cells of the battery stack 12. The branch duct 52 is connected to a side surface of the battery stack 12 located on the front side of the vehicle 100.

  The connection port 53 a of the branch duct 53 is connected to the intake chamber of the battery stack 13, and the air of the branch duct 53 is supplied to the cells of the battery stack 13. The branch duct 53 is connected to a side surface of the battery stack 13 located on the front side of the vehicle 100. The connection port 54 a of the branch duct 54 is connected to the intake chamber of the battery stack 14, and the air of the branch duct 54 is supplied to the cells of the battery stack 14. The branch duct 54 is connected to a side surface of the battery stack 12 located on the rear side of the vehicle 100.

  As shown in FIG. 9, an electronic device 60 is disposed below the intake duct 102. The electronic device 60 is fixed to the lower case 22. The electronic device 60 is a device used to control charging / discharging of the battery stacks 11 to 15. Examples of the electronic device 60 include a system main relay and a register. The system main relay allows or prohibits charging / discharging of the battery stacks 11 to 15. System main relays and resistors are attached to the junction box.

  As shown in FIG. 12, a pedestal (corresponding to a part of the support member) 80 is disposed on the upper surfaces of the branch ducts 51 to 54. The pedestal 80 is also located on a part of the upper surface of the intake duct 102. When viewed from above, the base 80 and the branch ducts 51 to 54 overlap each other. The pedestal 80 has legs (not shown) extending downward, and the tips of the legs are fixed to the lower case 22. Thereby, the base 80 can be positioned in the upper surface of the branch ducts 51-54. In this embodiment, the pedestal 80 is fixed using legs, but the present invention is not limited to this. For example, a bracket can be arrange | positioned between two adjacent battery stacks (11-14), and a base can be fixed to a bracket.

  A plurality of stud bolts 81 are provided on the upper surface of the pedestal 80, and each stud bolt 81 is formed with a thread groove. A battery stack 15 is disposed on the upper surface of the pedestal 80. The battery stack 15 includes a plurality of unit cells 151, and the plurality of unit cells 151 are arranged in one direction (the front-rear direction of the vehicle 100).

  A pair of end plates 152 are arranged at both ends of the battery stack 15. The restraining band 153 extends in the front-rear direction of the vehicle 100, and both ends of the restraining band 153 are fixed to the pair of end plates 152. Two restraining bands 153 are disposed on the upper surface of the battery stack 15, and two restraining bands 153 are disposed on the lower surface of the battery stack 15. By using the restraining band 153 and the end plate 152, restraining force can be applied to the plurality of single cells 151.

  The two brackets 156 and 158 are fixed to each end plate 152 by bolts 159a. The stud bolt 81 of the base 80 passes through the brackets 156 and 158 and meshes with the nut 159b.

  An intake chamber 154 and an exhaust chamber 155 are disposed on both side surfaces of the battery stack 15. The intake chamber 154 extends in the arrangement direction of the plurality of single cells 151, and a connection port 154 a is provided at one end of the intake chamber 154. The other end of the intake chamber 154 is closed. The exhaust chamber 155 extends in the arrangement direction of the plurality of unit cells 151, and an exhaust port 155 a is provided at one end of the exhaust chamber 155. The other end of the exhaust chamber 155 is closed. The connection port 154 a is provided at one end of the battery stack 15 in the front-rear direction of the vehicle 100, and the exhaust port 155 a is provided at the other end of the battery stack 15 in the front-rear direction of the vehicle 100. The connection port 154 a is connected to the intake duct 102 and air from the intake duct 102 enters the intake chamber 154.

  As shown in FIG. 13, the intake chamber 154 has a holding portion 154 b that holds the wire harness 70. The holding portion 154 b is provided on the upper portion of the intake chamber 154 and is recessed toward the unit cell 151. The wire harness 70 is accommodated in the holding portion 154b and does not protrude from the intake chamber 154. A plurality of holding portions 154b are provided, and the plurality of holding portions 154b are arranged at intervals in the longitudinal direction of the intake chamber 154 (the longitudinal direction of the vehicle 100).

  Further, the exhaust chamber 155 has a holding portion 155 b that holds the wire harness 70. The holding part 155b is provided in the upper part of the exhaust chamber 155, and is dented to the unit cell 151 side. The wire harness 70 is accommodated in the holding portion 155 b and does not protrude from the exhaust chamber 155. A plurality of holding portions 155b are provided, and the plurality of holding portions 155b are arranged at intervals in the longitudinal direction of the exhaust chamber 155 (the longitudinal direction of the vehicle 100).

  The wire harness 70 can be fixed to the battery stack 15 by using the holding portions 154b and 155b. By fixing the wire harness 70 to the battery stack 15, the wire harness 70 and the battery stack 15 can be easily handled, and the battery pack 1 can be easily assembled. Further, by accommodating the wire harness 70 in the holding portions 154b and 155b, the battery pack 1 can be prevented from being enlarged in the left-right direction of FIG.

  In this embodiment, the holding portions 154b and 155b are provided in the intake chamber 154 and the exhaust chamber 155 of the battery stack 15, but the present invention is not limited to this. Parts corresponding to the holding portions 154b and 155b can be provided for the intake chamber and the exhaust chamber of the battery stacks 11-14. Further, only one of the intake chamber and the exhaust chamber can be provided with a portion corresponding to the holding portions 154b and 155b.

  The bracket 157 extends in the arrangement direction of the plurality of unit cells 151 and is fixed to the exhaust chamber 155. The bracket 157 is bent in an L shape and extends toward the lower region of the electricity storage stack 15. The stud bolt 81 of the base 80 passes through the bracket 157 and meshes with the nut 159b. Although not shown in FIG. 12, a bracket 157 is also fixed to the intake chamber 154. The battery stack 15 is fixed to the pedestal 80 by using the three types of brackets 156 to 158. As described in FIG. 6, the bus bar module is disposed on the upper surface of the battery stack 15.

  As illustrated in FIGS. 13 and 14, the dummy single cells 11 </ b> B to 14 </ b> B included in the battery stacks 11 to 14 face the bracket 157 in the vehicle front-rear direction. Here, when the vehicle vibrates or collides, the battery stacks 11 to 14 are bent in the front-rear direction of the vehicle, and the dummy cells 11B to 14B included in these battery stacks 11 to 14 may abut against the bracket 157. Since the dummy cells 11B to 14B are merely cases that do not include a power generation element, it is not necessary to set a large interval between the adjacent battery stacks 11 to 14 in order to avoid contact with the bracket 157. That is, since the space | interval of the battery stacks 11-14 adjacent to the front-back direction of a vehicle can be made small, the battery pack 1 can be reduced in size.

In addition, since the dummy cells 11B to 14B have the same outer dimensions as the cells 11A (including errors) and the same strength in the arrangement direction (that is, the constraint direction) (including errors), the stack constraint balance Can be prevented from collapsing.

  The battery stacks 12 to 14 are pressed against the lower case 22 by the bracket 30. The shape of the bracket 30 differs depending on the battery stacks 12 to 14. The five battery stacks 11 to 15 are electrically connected via the wire harness 70. An opening 22c is formed in the side wall of the lower case 22, and the opening 22c is provided for allowing the battery stacks 11 to 15 and the cable connecting the load to pass therethrough.

  A current breaker 71 is disposed near one of the two battery monitoring units 40. The current breaker 71 is used to cut off the current paths of the battery stacks 11 to 15. The current breaker 71 includes a plug and a grip inserted into the plug, and the current path can be blocked by removing the grip from the plug.

  The current breaker 71 passes through the opening 20 c (see FIG. 2) of the pack case 20 and also passes through the opening formed in the floor panel 101. Thereby, the current breaker 71 protrudes into the vehicle interior, and the operator can operate the current breaker 71 in the vehicle interior. The current breaker 71 can be positioned in a space formed below the seat cushion. In addition, a sealing member can be used to ensure the sealing between the opening 20c of the pack case 20 and the floor panel 101.

1: Battery pack (power storage device)
11-14: Battery stack (second power storage stack)
11A Single cell (electric storage element) 11B Dummy single cell (dummy electric storage element)
15: Battery stack (first power storage stack)

Claims (1)

A first power storage stack including a plurality of power storage elements arranged side by side in the vehicle front-rear direction, and a fixing bracket for fixing these power storage elements projecting downward;
A plurality of power storage elements arranged side by side in the vehicle width direction, a dummy power storage element that does not have a power storage function, and a second power storage stack disposed below the first power storage stack,
The power storage device, wherein the dummy power storage element is adjacent to the fixed bracket in a vehicle front-rear direction.

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