JP6345089B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device in which a plurality of plate-like cells are stacked.

  Patent Document 1 below discloses a power storage device including a power storage module in which a plurality of plate-like cells are stacked. The power storage module is fixed to the bottom plate of the housing. If there are variations in the thickness of the plurality of cells, the dimensions of the power storage module also vary in the cell stacking direction. For this reason, the relative positional relationship between the connection terminal of the power storage module and the fixed terminal fixed to the housing varies. The connection terminal of the storage module and the fixed terminal are connected by a bus bar. By making the bolt through hole of the bus bar connected to the fixed terminal into a long hole, fluctuations in the relative positional relationship between the connection terminal and the fixed terminal are absorbed.

  The electrode tab drawn from each cell is perpendicular to the bottom plate of the housing. The electrode tabs of the cells at both ends with respect to the stacking direction are connected to the connection terminals of the power storage module. Accordingly, the connection terminals are also arranged perpendicular to the bottom plate. The contact surface between the connection terminal and the bus bar is also perpendicular to the bottom plate.

International Publication No. 2013/118874

  The bus bar is fixed to the fixed terminal by passing a bolt through a long hole provided in the bus bar. Since the bolt hole formed in the bus bar is a long hole, the electrical resistance between the bus bar and the fixed terminal is greater than when the bolt hole is a perfect circle.

  Since the contact surface between the connection terminal of the power storage module and the bus bar is perpendicular to the bottom plate, the bolt for fixing both penetrates the bus bar in a direction parallel to the bottom plate. Since the side plate of the housing exists on the extension line of the bolt, the workability of the bolt tightening work is poor.

  An object of the present invention is to provide a power storage device that can suppress an increase in electrical resistance even if there are variations in the dimensions of power storage modules and that is not accompanied by a decrease in workability in assembly work.

According to one aspect of the invention,
A lower housing including a bottom plate and a side plate and opening upward;
A first power storage module housed in the lower housing, fixed to the bottom plate, and including a first connection terminal and a second connection terminal at both ends;
A second power storage module housed in the lower housing, fixed to the bottom plate, and including a third connection terminal and a fourth connection terminal at both ends;
A first fixed terminal, a second fixed terminal, a third fixed terminal, and a fourth fixed terminal fixed to the bottom plate;
A first cable connecting the first connection terminal and the first fixed terminal;
A second cable connecting the third connection terminal and the second fixed terminal;
A first conductive member connecting the second connection terminal and the third fixed terminal;
A second conductive member connecting the fourth connection terminal and the fourth fixed terminal;
A lid for closing the opening of the lower housing;
Each of the first connection terminal, the third connection terminal, the first fixed terminal, and the second fixed terminal has a contact surface facing upward,
Two terminals at both ends of each of the first cable and the second cable include a conductor plate,
One of the conductor plates of the first cable is in contact with the contact surface of the first connection terminal, the other of the conductor plates is in contact with the contact surface of the first fixed terminal, One of the conductor plates of the second cable is in contact with the contact surface of the third connection terminal, and the other conductor plate is in contact with the contact surface of the second fixed terminal;
The first cable and the second cable are provided with a power storage device that is curved in a lateral direction.

  By bending the first cable and the second cable, variation in the relative positional relationship between the first connection terminal and the first fixed terminal, and the relative position between the third connection terminal and the second fixed terminal. Variations in relationships are absorbed. The conductor plate of the first cable and the conductor plate of the second cable are in contact with the contact surface facing upward. For this reason, the conductor plate can be fixed by tightening with a bolt or the like from above. Workability is improved compared to the case where bolts are tightened from the lateral direction. Since the conductor plate is disposed in parallel with the contact surface facing upward, the first cable and the second cable are locally excessively bent by bending the first cable and the second cable in the lateral direction. Can be avoided.

1A is a schematic plan view of a power storage device according to an embodiment, and FIG. 1B is a cross-sectional view taken along one-dot chain line 1B-1B in FIG. 1A. 2A and 2B are perspective views of a lid and a lower housing of a power storage device according to another embodiment, respectively. FIG. 3 is a plan view of the lower housing and components housed in the lower housing. 4 is an equivalent circuit diagram of the power storage device shown in FIG. 5 is a cross-sectional view taken along one-dot chain line 5-5 in FIG. FIG. 6 is a perspective view of the first connection terminal and the vicinity thereof.

  FIG. 1A is a schematic plan view of a power storage device according to an embodiment. FIG. 1B is a cross-sectional view taken along one-dot chain line 1B-1B in FIG. 1A.

  The lower housing 10 includes a bottom plate 11 and a side plate 12 and opens upward. The side plate 12 circulates around the bottom plate 11 along the outer periphery of the bottom plate 11. The opening of the lower housing 10 is closed with a lid 15. The first power storage module 20, the second power storage module 21, the first fixed terminal 31, the second fixed terminal 32, the third fixed terminal 33, and the fourth fixed terminal 34 are fixed to the bottom plate 11. Yes.

  The first fixed terminal 31 is fixed to the bottom plate 11 via an insulating support member 35 (FIG. 1B). The third fixed terminal 33 is fixed to the bottom plate 11 via an insulating support member 36 (FIG. 1B). Similarly, the second fixed terminal 32 and the fourth fixed terminal 34 are also fixed to the bottom plate 11 via an insulating support member.

  The bottom plate 11 includes a rectangular first portion 111 and a second portion 112 projecting outward from a portion of one side (the right side in FIG. 1A) of the first portion 111. The first power storage module 20, the second power storage module 21, the third fixed terminal 33, and the fourth fixed terminal 34 are disposed in the first portion 111. The first fixed terminal 31 and the second fixed terminal 32 are disposed in the second portion 112.

  The first power storage module 20 includes a plurality of cells 201, a first connection terminal 202, and a second connection terminal 203. Each of the plurality of cells 201 has a plate-like outer shape. A plurality of cells 201 are stacked in a direction parallel to the bottom plate 11 in a posture in which the thickness direction of the cells 201 is parallel to the bottom plate 11 (a posture in which the cells 201 are substantially perpendicular to the bottom plate 11). Are electrically connected in series. A laminate type cell is used as the cell 201. A laminate-type cell has a structure in which a plurality of positive plates and a plurality of negative plates are stacked via a separator. The separator is impregnated with the electrolytic solution. A laminate including a positive electrode plate, a negative electrode plate, and a separator is sandwiched and sealed between aluminum laminate films. Since the thickness of the active material layer provided on the positive electrode plate and the negative electrode plate varies, the cell thickness also varies.

  Pressure plates 204 and 205 are disposed at both ends of the stacked cells 201, respectively. The pressure plates 204 and 205 apply a compressive force in the stacking direction (the thickness direction of the cell 201) to the cell 201.

  The lower ends of the pressure plates 204 and 205 are bent in an L shape toward the outside of the first power storage module 20. U-shaped notches 206 and 207 are provided at the ends of the bent portions of the pressure plates 204 and 205, respectively. The pressure plates 204 and 205 are fixed to the bottom plate 11 by passing the fasteners 25 (FIG. 1B) such as bolts through the notches 206 and 207. The first connection terminal 202 is attached to one pressure plate 204, and the second connection terminal 203 is attached to the other pressure plate 205. The first power storage module 20 is charged and discharged through the first connection terminal 202 and the second connection terminal 203.

  Similarly, the second power storage module 21 includes a cell 211, a third connection terminal 212, a fourth connection terminal 213, pressure plates 214 and 215, and notches 216 and 217. The second power storage module 21 is charged and discharged through the third connection terminal 212 and the fourth connection terminal 213. The 1st electrical storage module 20 and the 2nd electrical storage module 21 are arrange | positioned so that the stacking direction of the cell 201 and the stacking direction of a cell and 211 may become parallel.

  The first connection terminal 202 and the first fixed terminal 31 are connected by the first cable 41. The third connection terminal 212 and the second fixed terminal 32 are connected by the second cable 42. As the first cable 41 and the second cable 42, for example, conductive wires covered with an insulating coating are used. The second connection terminal 203 and the third fixed terminal 33 are connected by the first conductive member 43. The fourth connection terminal 213 and the fourth fixed terminal 34 are connected by the second conductive member 44. As terminals at both ends of the first cable 41 and the second cable 42, for example, crimp terminals are used. The safety circuit module 38 connects the first fixed terminal 31 and the second fixed terminal 32.

  The first connection terminal 202, the third connection terminal 212, the first fixed terminal 31, and the second fixed terminal 32 each have a contact surface facing upward. These contact surfaces include, for example, a flat surface extending in a direction parallel to the bottom plate 11. Terminals at both ends of the first cable 41 include conductor plates 411 and 412. Similarly, the terminals at both ends of the second cable 42 also include conductor plates 421 and 422. The conductor plates 411, 412, 421, and the conductor plate 422 are flat surfaces that contact the contact surfaces of the first connection terminal 202, the first fixed terminal 31, the third connection terminal 212, and the second fixed terminal 32, respectively. Surface.

  One conductor plate 411 of the first cable 41 contacts the contact surface facing upward of the first connection terminal 202, and the other conductor plate 412 contacts the contact surface facing upward of the first fixed terminal 31. To do. One conductor plate 421 of the second cable 42 contacts the contact surface facing upward of the third connection terminal, and the other conductor plate 422 contacts the contact surface facing upward of the second fixed terminal 32. . These conductor plates 411, 412, 421, 422 are respectively fastened to the first connection terminal 202, the first fixed terminal 31, the third connection terminal 212, and the second fixed terminal 32 by bolts or the like. 26 (FIG. 1B). The first cable 41 and the second cable 42 are curved in the lateral direction, that is, in a direction parallel to the bottom plate 11.

  For example, bus bars are used for the first conductive member 43 and the second conductive member 44. The second connection terminal 203, the fourth connection terminal 213, the third fixed terminal 33, and the fourth fixed terminal 34 have contact surfaces that face upward. The bus bar comes into contact with these contact surfaces and is fixed by a fastening tool 27 (FIG. 1B) such as a bolt.

  The first power storage module 20 and the second power storage module 21 are positioned and fixed to the bottom plate 11. The position for fixing is defined by a screw hole formed in the bottom plate 11. The thickness of the laminate-type cell 201 varies within a tolerance range. For this reason, in the stacking direction of the cells 201, the size of the first power storage module 20 also varies in manufacturing. When one end of the first power storage module 20 is fixed at the design position, the position of the other end varies due to the variation in the dimensions of the first power storage module 20. The other end is fixed at a position where the variation in dimensions of the first power storage module 20 is reflected.

  In the present embodiment, one pressure plate 205 of the first power storage module 20 is fixed at the design position. The position of the other pressure plate 204 varies within the range of variation in the dimensions of the first power storage module 20. The variation in the position of the pressure plate 204 is absorbed by the U-shaped notch 206 provided in the pressure plate 204. The second connection terminal 203 attached to the pressure plate 205 is substantially fixed at the design position, but the first connection terminal 202 attached to the pressure plate 204 has variations in the dimensions of the first power storage module 20. It is fixed at the reflected position. Similarly, with respect to the second power storage module 21, the fourth connection terminal 213 is substantially fixed at the design position, but the third connection terminal 212 reflects variations in dimensions of the second power storage module 21. It is fixed at the position.

  The positions of the first fixed terminal 31 and the second fixed terminal 32 are fixed to the design position of the bottom plate 11 regardless of variations in the dimensions of the first power storage module 20 and the second power storage module 21. For this reason, variations occur in the distance between the first fixed terminal 31 and the first connection terminal 202 and the distance between the second fixed terminal 32 and the third connection terminal 212. The first cable 41 is deformed according to the variation in the distance between the first connection terminal 202 and the first fixed terminal 31. Similarly, the second cable 42 is deformed according to the variation in the distance between the third connection terminal 212 and the second fixed terminal 32. Thus, the deformation | transformation of the dimension of the 1st electrical storage module 20 and the 2nd electrical storage module 21 is absorbed by the 1st cable 41 and the 2nd cable 42 deform | transforming. This deformation amount may be a region where elastic deformation occurs or a region where plastic deformation occurs. The first cable 41 and the second cable 42 have such rigidity that they do not hang down even if they are affected by gravity in a state of being curved in the lateral direction.

  Next, effects of the embodiment shown in FIGS. 1A and 1B will be described. In the present embodiment, the contact surface of the first connection terminal 202 faces upward. The conductor plate 411 of the first cable 41 is in contact with this contact surface. Since the fastening tool 26 penetrates the conductor plate 411 in the thickness direction, the fastening tool 26 can be easily fastened from above the lower housing 10. Similarly, the fastener 26 that fixes the conductor plates 421, 412, and 422 that are in contact with the third connection terminal 212, the first fixed terminal 31, and the second fixed terminal 32, respectively, can be easily tightened. . For this reason, workability can be improved.

  When the first cable 41 is bent in the lateral direction, the postures of the conductor plates 411 and 412 at both ends thereof in the in-plane direction are changed. Similarly, when the second cable 42 is bent in the lateral direction, the postures in the in-plane directions of the conductor plates 421 and 422 at both ends thereof are changed. As described above, when the first cable 41 and the second cable 42 are bent in the horizontal direction, they are locally excessive in the vicinity of the connection portion between the cable and the terminals at both ends, compared to the case where the first cable 41 and the second cable 42 are bent in the vertical direction. Is unlikely to occur.

  The second connection terminal 203 and the fourth connection terminal 213 are fixed at the design position. For this reason, as the first conductive member 43 that connects the second connection terminal 203 and the third fixed terminal 33, a bus bar that is not easily deformed can be used. Furthermore, the through hole of the bus bar for passing a bolt or the like can be made into a perfect circle. For this reason, the resistance of the connection portion between the first conductive member 43 and the second connection terminal 203 and the resistance of the connection portion between the first conductive member 43 and the third fixed terminal 33 can be kept low. . Similarly, the resistance of the connection portion between the second conductive member 44 and the fourth connection terminal 213 and the resistance of the connection portion between the second conductive member 44 and the fourth fixed terminal 34 can be kept low. .

  Next, a power storage device according to another embodiment will be described with reference to FIGS. 2A to 6. Hereinafter, differences from the embodiment shown in FIGS. 1A and 1B will be described, and descriptions of common configurations may be omitted. Components in the embodiment shown in FIGS. 2A to 6 and corresponding components in the embodiment shown in FIGS. 1A and 1B are denoted by the same reference numerals.

  FIG. 2A shows a perspective view of the lid 15, and FIG. 2B shows a perspective view of the lower housing 10.

  As shown in FIG. 2B, the lower housing 10 includes a bottom plate 11 and side plates 12. The bottom plate 11 includes a first portion 111 (FIG. 1A) and a second portion 112 (FIG. 1A). Reinforcing ribs 16 are formed along the boundary between the first portion 111 and the second portion 112. The reinforcing rib 16 is lower than the side plate 12. A space through which the first cable 41 and the second cable 42 (FIGS. 1A and 1B) pass is secured between the upper end of the reinforcing rib 16 and the lid 15. The safety circuit housing portion 14 is defined by the side plate 12 and the reinforcing rib 16 that surround the second portion 112. The reinforcing rib 16 increases the rigidity of the lower housing 10. The lower housing 10 has one opening continuous from the first portion 111 to the second portion 112.

  The connector housing portion 13 projects outward from the side plate 12 opposite to the second portion 112. The connector housing 13 is provided with other openings apart from the openings corresponding to the first portion 111 and the second portion 112. The space inside the connector housing portion 13 is connected to the space above the first portion 111. At the upper end of the side plate 12, a flange 121 protruding outward is provided. A plurality of through holes 122 are formed in the flange 121. The bottom plate 11, the side plate 12, the flange portion 121, the connector housing portion 13, and the safety circuit housing portion 14 are formed by, for example, a casting method.

  The lid 15 shown in FIG. 2A closes the opening corresponding to the first portion 111 and the second portion 112 (FIG. 2B) of the lower housing 10. The opening of the connector housing portion 13 (FIG. 2B) is closed with a connector member. The lid 15 includes an upper plate 17 and a side plate 18. The side plate 18 circulates around the upper plate 17 along the outer peripheral portion of the upper plate 17. At the lower end of the side plate 18, a flange portion 181 projecting outward is formed. A through hole 182 is formed in the flange portion 181. The upper plate 17, the side plate 18, and the flange portion 181 are formed by a casting method.

  With the lid 15 closing the opening of the lower housing 10, the through hole 182 of the lid 15 overlaps with the through hole 122 of the lower housing 10. The lid 15 is fixed to the lower housing 10 by bolts and nuts inserted into the through holes 182 and the through holes 122.

  FIG. 3 shows a plan view of the lower housing 10 and parts housed in the lower housing 10. The first power storage module 20 and the second power storage module 21 are accommodated in the lower housing 10. Hereinafter, the configuration of the first power storage module 20 will be described. The second power storage module 21 also has the same configuration as the first power storage module 20.

  A plurality of cells 201 and a plurality of heat transfer plates 208 are alternately stacked in the thickness direction. Note that the cells 201 and the heat transfer plates 208 are not necessarily stacked alternately. For example, one heat transfer plate 208 may be inserted into two cells 201. Pressure plates 204 and 205 are disposed at both ends of the laminate composed of the cell 201 and the heat transfer plate 208, respectively. A plurality of tie rods 209 are bridged from one pressure plate 205 to the other pressure plate 204. By tightening the tie rod 209 with a nut, a compressive force is applied to the laminate including the cell 201 and the heat transfer plate 208.

  Each of the cells 201 is held in a posture perpendicular to the bottom plate 11 of the lower housing 10. Electrode tabs 2011 are led out from both ends of each cell 201 in a direction parallel to the bottom plate 11 (vertical direction in FIG. 3). A metal plate is used for the electrode tab 2011. Since the cell 201 is held perpendicular to the bottom plate, the electrode tab 2011 also maintains a posture perpendicular to the bottom plate 11. A plurality of cells 201 are connected in series by connecting electrode tabs 2011 of adjacent cells 201 or directly adjacent cells 201 with heat transfer plate 208 interposed therebetween. One electrode tab 2011 of the cell 201 at both ends is connected to the first connection terminal 202 and the second connection terminal 203, respectively.

  The first fixed terminal 31, the second fixed terminal 32, and the safety circuit module 38 are accommodated in the safety circuit accommodating portion 14. One terminal of the safety circuit module 38 is connected to the first fixed terminal 31, and the other terminal is connected to the second fixed terminal 32. The safety circuit module 38 includes, for example, a fuse and a safety switch.

  The first cable 41 that connects the first connection terminal 202 and the first fixed terminal 31 and the second cable 42 that connects the third connection terminal 212 and the second fixed terminal 32 are in plan view. And crosses the reinforcing rib 16 and passes above the reinforcing rib 16 in the height direction. The contact surface of the first connection terminal 202, the contact surface of the first fixed terminal 31, the contact surface of the second fixed terminal 32, and the contact surface of the third connection terminal 212 are higher than the upper end of the reinforcing rib 16. Placed in position. For this reason, unnecessary deformation in the height direction does not occur in the first cable 41 and the second cable 42.

  If the structure which arrange | positions the safety circuit module 38 to the 1st part 111 (FIG. 2B) is employ | adopted, the 1st part 111 must be enlarged. In the embodiment, since the safety circuit housing portion 14 that houses the safety circuit module 38 is configured to project laterally from the first portion 111 of the bottom plate 11, unnecessary space in the lower housing 10 is reduced. be able to. By reducing unnecessary space, a decrease in rigidity of the lower housing 10 is suppressed. The width of the safety circuit accommodating portion 14 (in FIG. 3, the dimension in the direction orthogonal to the stacking direction of the cells 201) is such that the first cable 41 and the second cable 42 that are curved in the lateral direction It is preferable to make it small as long as the condition of not contacting is satisfied.

  The relay circuit module 37, the first equalization circuit module 45, and the second equalization circuit module 46 are fixed to the first portion 111 of the lower housing 10. The relay circuit module 37 is connected to the second connection terminal 203 via the third fixed terminal 33 and the first conductive member 43, and via the fourth fixed terminal 34 and the second conductive member 44. It is connected to the fourth connection terminal 213.

  A connector 39 is accommodated in the connector accommodating portion 13. The connector 39 is connected to the relay circuit module 37. Through the connector 39, the first power storage module 20 and the second power storage module 21 are connected to an external device such as a DC-DC converter.

  A first equalization circuit module 45 is disposed between the pressure plate 205 of the first power storage module 20 and the side plate 12 facing it. The first equalization circuit module 45 includes a plurality of equalization circuits. Each of these equalization circuits is connected to the cell 201 of the first power storage module 20. The first equalization circuit module 45 equalizes the voltages of the plurality of cells 201. Similarly, the second equalization circuit module 46 is also disposed between the second power storage module 21 and the side plate 12. The second equalization circuit module 46 equalizes the voltage of the cell 211 of the second power storage module 21.

  FIG. 4 shows an equivalent circuit diagram of the power storage device shown in FIG. The first power storage module 20 includes a plurality of cells 201 connected in series. The second power storage module 21 includes a plurality of cells 211 connected in series. The first connection terminal 202 of the first power storage module 20 is connected to the third connection terminal 212 of the second power storage module 21 via the safety circuit module 38. The safety circuit module 38 includes a safety switch 381 and a fuse 382 connected in series with each other.

  The second connection terminal 203 of the first power storage module 20 and the fourth connection terminal 213 of the second power storage module 21 are connected to the connector 39 via the relay circuit module 37, respectively. The resistance element connected in series to one relay included in the relay circuit module 37 prevents an inrush current when precharging an external capacitor.

  FIG. 5 is a cross-sectional view taken along one-dot chain line 5-5 in FIG. The pressure plates 204 and 205 are fixed to the bottom plate 11 by fastening tools 25 such as bolts. The opening of the lower housing 10 is closed with a lid 15. A fastening tool 125 such as a bolt passes through the flange 121 of the lower housing 10 and the flange 181 of the lid 15. The fastener 125 applies a force in a direction to bring the lower casing 10 and the lid 15 closer to each other.

  The heat transfer plate 208 is in contact with the bottom plate 11 of the lower housing 10 at its lower end surface, and is in contact with the upper plate 17 of the lid 15 at its upper end surface. Since the lid 15 is pressed against the lower housing 10, the heat transfer plate 208 is firmly fixed between the lower housing 10 and the lid 15.

  A channel 115 is formed in the bottom plate 11, and a channel 175 is formed in the upper plate 17. The cell 201 can be cooled via the heat transfer plate 208 by flowing a cooling medium through the flow paths 115 and 175.

  FIG. 6 is a perspective view of the first connection terminal 202 and the vicinity thereof. The lower end of the pressure plate 204 is bent in an L shape. A U-shaped cut 206 is formed at the tip of the bent portion. A bent portion 2041 is formed by bending a part of the side edge of the pressure plate 204 at a substantially right angle. The bent portion 2041 is parallel to the stacking direction of the cells 201 (FIG. 3) and is perpendicular to the bottom plate 11 (FIG. 3).

  The first connection terminal 202 includes a vertical portion 2021, a horizontal portion 2023, and an intermediate portion 2022 that connects the two. The vertical portion 2021 is parallel to the bent portion 2041. The horizontal portion 2023 is parallel to the bottom plate 11 (FIG. 3) and has a contact surface facing upward. The vertical portion 2021 is fixed to the bent portion 2041 through an insulator 2042. The electrode tab 2011 of the cell 201 (FIG. 3) is in contact with and electrically connected to the vertical portion 2021.

  A screw hole 2024 is formed in the horizontal portion 2023. The conductor plate 411 connected to the end of the first cable 41 comes into contact with the contact surface of the horizontal portion 2023. The conductor plate 411 is fixed to the horizontal portion 2023 by a fastening tool such as a bolt.

  The first connection terminal 202 has a function of fixing the electrode tab 2011 to the pressure plate 204. Further, the first connection terminal 202 is in contact with the electrode tab 2011 perpendicular to the bottom plate 11 (FIG. 3) and the conductor plate 411 arranged in parallel to the bottom plate 11. It has a function to change the orientation of the surface.

  The second connection terminal 203, the third connection terminal 212, and the fourth connection terminal 213 also have the same structure and the same function as the first connection terminal 202.

  Although the present invention has been described with reference to the embodiments, the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

DESCRIPTION OF SYMBOLS 10 Lower housing | casing 11 Bottom plate 12 Side plate 13 Connector accommodating part 14 Safety circuit accommodating part 15 Cover 16 Reinforcement rib 17 Upper plate 18 Side plate 20 1st electrical storage module 21 2nd electrical storage module 25, 26, 27 Fastener 31 1st Fixed terminal 32 second fixed terminal 33 third fixed terminal 34 fourth fixed terminal 35, 36 support member 37 relay circuit module 38 safety circuit module 39 connector 41 first cable 42 second cable 43 first Conductive member 44 Second conductive member 45 First equalization circuit module 46 Second equalization circuit module 111 First portion 112 Second portion 115 Flow path 121 Ridge part 122 Through hole 125 Fastener 175 Flow path 181 Hook 182 Through-hole 201 Cell 202 First connection terminal 203 Second connection terminal 204, 205 Pressure plate 206, 207 Cut 208 Heat transfer plate 209 Tie rod 211 Cell 212 Third connection terminal 213 Fourth connection terminal 214, 215 Pressure plate 216, 217 Cut 381 Safety switch 382 Fuse 411, 412 Conductor plate 421, 422 of first cable terminal Conductor plate 2011 of second cable terminal Electrode tab 2021 Vertical portion 2022 Intermediate portion 2023 Horizontal portion 2024 Screw hole 2041 Bending portion 2042 Insulator

Claims (5)

A lower housing including a bottom plate and a side plate and opening upward;
A first power storage module housed in the lower housing, fixed to the bottom plate, and including a first connection terminal and a second connection terminal at both ends;
A second power storage module housed in the lower housing, fixed to the bottom plate, and including a third connection terminal and a fourth connection terminal at both ends;
A first fixed terminal, a second fixed terminal, a third fixed terminal, and a fourth fixed terminal fixed to the bottom plate;
A first cable connecting the first connection terminal and the first fixed terminal;
A second cable connecting the third connection terminal and the second fixed terminal;
A first conductive member connecting the second connection terminal and the third fixed terminal;
A second conductive member connecting the fourth connection terminal and the fourth fixed terminal;
A lid for closing the opening of the lower housing;
Each of the first connection terminal, the third connection terminal, the first fixed terminal, and the second fixed terminal has a contact surface facing upward,
Two terminals at both ends of each of the first cable and the second cable include a conductor plate,
One of the conductor plates of the first cable is in contact with the contact surface of the first connection terminal, the other of the conductor plates is in contact with the contact surface of the first fixed terminal, One of the conductor plates of the second cable is in contact with the contact surface of the third connection terminal, and the other conductor plate is in contact with the contact surface of the second fixed terminal;
The power storage device in which the first cable and the second cable are curved in a lateral direction. By positioning and fixing the first power storage module to the bottom plate, the second connection terminal is positioned and fixed at a design position in the bottom plate,
The first connection terminal is fixed at a position reflecting a variation in manufacturing dimensions of the first power storage module;
By positioning and fixing the second power storage module to the bottom plate, the fourth connection terminal is positioned and fixed at a design position in the bottom plate,
The third connection terminal is fixed at a position reflecting a variation in manufacturing dimensions of the second power storage module,
The first cable is deformed according to a variation in the position of the first connection terminal due to a variation in the dimensions of the first power storage module,
The power storage device according to claim 1, wherein the second cable is deformed in accordance with a variation in position of the third connection terminal due to a variation in dimensions of the second power storage module.   The power storage device according to claim 2, wherein the first conductive member and the second conductive member are bus bars. Each of the first power storage module and the second power storage module includes a plurality of cells stacked and connected in series,
The stacking direction of the cells is parallel to the bottom plate;
Electrode tabs are drawn from the cells at both ends, and the electrode tabs are arranged perpendicular to the bottom plate,
The first connection terminal includes a first vertical portion that contacts the electrode tab, a first horizontal portion that contacts the conductor plate of the first cable, and the first vertical portion and the first vertical portion. A first intermediate part connecting the horizontal part,
The third connection terminal includes a second vertical portion that contacts the electrode tab, a second horizontal portion that contacts the conductor plate of the second cable, and the second vertical portion and the second vertical portion. The power storage device according to any one of claims 1 to 3, further comprising a second intermediate portion connecting the horizontal portion. The bottom plate includes a rectangular first part and a second part protruding from a part of one side of the first part,
The first power storage module and the second power storage module are fixed to the first portion, and the first fixed terminal and the second fixed terminal are fixed to the second portion. The power storage device according to claim 1.

Images