JP6245105B2 - Power module - Google Patents

Description

  The present invention relates to a power supply module using a power storage element such as a secondary battery.

  Secondary batteries are widely used as power sources for electronic devices such as mobile phones and IT devices, as well as for replacing primary batteries. In particular, non-aqueous electrolyte secondary batteries represented by lithium ion secondary batteries have a high energy density, and are therefore being applied to electric devices such as electric vehicles.

  The secondary battery is repeatedly charged and discharged to decompose and vaporize the internal electrolyte, thereby expanding and deforming the exterior. Therefore, a safety valve is provided on the exterior of the secondary battery so as to be opened at a predetermined pressure and to discharge the internal gas. Further, an assembled battery formed by arranging and connecting a plurality of batteries is provided with an exhaust pipe that communicates with a safety valve of each battery and guides and discharges gas to the outside (for example, Patent Document 1 and FIG. 5). , See FIG.

JP2013-168355A

  However, the conventional assembled battery has the following problems. That is, the exhaust pipe is restricted by the arrangement of the safety valves in the assembled battery, and the degree of freedom in designing the assembled battery is impaired.

  This invention is made | formed in view of said subject, and it aims at providing the power supply module which can improve the freedom degree of the discharge direction of gas.

In order to achieve the above object, the first aspect of the present invention provides:
A cell stack including a plurality of power storage elements having safety valves is provided.
A gas flow path through which gas discharged from the safety valve flows is formed on the surface of the cell stack in which the safety valve is arranged,
The gas flow path crosses all or part of the arrangement of the safety valves, and discharges gas through a first opening provided in the middle of the arrangement of the safety valves.
It is a power supply module.

The second aspect of the present invention is
The gas flow path causes gas to be discharged via a second opening provided in a direction intersecting with the arrangement of the safety valves.
It is a power supply module of the 1st side of the present invention.

The third aspect of the present invention is
The gas flow path is formed along a plane intersecting the direction in which gas is ejected from the safety valve.
It is a power module of the 1st or 2nd side of the present invention.

The fourth aspect of the present invention is
A bus bar holder that holds the bus bar that connects the power storage elements stacked on the surface of the cell stack where the safety valves are arranged,
The gas flow path is formed in the bus bar holder,
4 is a power supply module according to any one of the first to third aspects of the present invention.

The fifth aspect of the present invention provides
The bus bar holder is
A first holder member formed with an opening surrounding the safety valves arranged;
A second holder member that overlaps with the opening and has a groove that reaches the edge;
The gas flow path is formed by the opening and wall of the first holder member, and the groove and wall of the second holder member.
It is a power supply module of the 4th side of the present invention.

The sixth aspect of the present invention provides
The second holder member is insulative and covers at least the surface of the bus bar opposite to the surface facing the cell stack;
It is a power supply module of the 5th side of the present invention.

The seventh aspect of the present invention is
A power supply module according to any one of the first to sixth aspects of the present invention;
A housing for housing the power supply module,
The housing has an exhaust port communicating from the inside to the outside,
The opening of the gas flow path is directed to the exhaust port of the housing;
It is a power pack.

The eighth aspect of the present invention provides
The housing is sealed and communicates only through the exhaust port;
It is a power supply pack of the 7th side surface of this invention.

  The present invention as described above has an effect that it is possible to improve the degree of freedom in the gas discharge direction in the power supply module.

The perspective view which shows the structure of the power supply pack which concerns on embodiment of this invention. The perspective view which shows the structure of the power supply module main body which concerns on embodiment of this invention. The disassembled perspective view which shows the structure of the power supply module main body which concerns on embodiment of this invention. The disassembled perspective view which shows the structure of the principal part of the power supply module main body which concerns on embodiment of this invention. The disassembled perspective view which shows the structure of the bus-bar assembly unit of the power supply module main body which concerns on embodiment of this invention. Sectional drawing which shows the structure of the bus-bar assembly unit of the power supply module main body which concerns on embodiment of this invention The figure for demonstrating the structure of the power supply module main body which concerns on embodiment of this invention The figure for demonstrating the other structural example of the power supply module main body which concerns on embodiment of this invention

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(1. Power pack)
FIG. 1 is a perspective view showing a configuration of a power supply pack 1 according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view showing a power supply module main body accommodated in the power supply pack 1.

  As shown in FIG. 1, the power supply pack 1 includes an outer hexahedral housing composed of an opening box-shaped container body 10 made of a synthetic resin such as polypropylene and a lid portion 20, and is exposed on the surface of the lid portion 20. , A negative electrode terminal 21a and a positive electrode terminal 21b for connection to an external load (not shown), and an exhaust tube 22 communicating with the internal space of the housing. For the sake of explanation, only the outline of the housing is shown by a dotted line as a perspective view.

  In addition, the power supply pack 1 houses a power supply module main body 30 inside the housing. As shown in FIG. 2, the power module main body 30 includes a cell stack 32 in which a plurality of single cells are arranged, and a bus bar assembly unit 33 combined with the cell stack 32.

  An exhaust port 31 through which the gas from the cell stack 32 is discharged is provided on the upper surface of the bus bar assembly unit 33. As shown in FIG. 1, the exhaust port 31 is opened toward the exhaust tube 22 of the lid portion 20 of the housing.

  The entire housing is hermetically sealed, so that the gas discharged from the exhaust port 31 stays inside the housing and is then exhausted from the exhaust tube 22 of the lid 20 to the outside of the power pack 1.

  Note that the arrangement direction of the cells in the cell stack of the power supply module main body is on a straight line parallel to the X axis in the orthogonal coordinate system of the X axis, the Y axis, and the Z axis shown in FIG. Each surface of the power module main body 30 and the like is determined to be approximately parallel to the X axis, the Y axis, and the Z axis. Further, in the following description, the X-axis direction is determined from the right to the left, the X-axis direction from the back to the near side, and the Z-axis direction from the bottom to the top, based on the direction of the arrow in the drawing.

(2. Power supply module body)
FIG. 3 is an exploded perspective view showing the configuration of the power module main body 30. As shown in FIG. 3, the power supply module main body 30 is configured to arrange and fasten unit cells 320 a such as non-aqueous electrolyte secondary batteries, and to electrically connect the unit cells of the cell stack 32. A bus bar assembly unit 33 is provided.

  The cell stack 32 has a mode in which a plurality of unit cells 320a are arranged with their side surfaces aligned. Each unit cell 320a includes a metal open box-shaped exterior body 320a1 in which an electrode body and an electrolytic solution are enclosed, for example, aluminum or stainless steel, electrode terminals 320a3 and 320a4, a safety valve 320a5, and A sealing plug 320a6 for sealing the electrolyte inlet, and a lid 320a2 made of the same material as the exterior body 320a1 that closes the opening of the exterior body 320a1 by laser welding or the like. The outer shape with the upper and lower bottom surfaces of the surface of the part 320a2 and the bottom surface of the exterior body part 320a1 which is the opposite surface thereof has a flat prismatic shape. In the unit cell 320a, the surface of the exterior body 320a1 may be exposed as it is, or a side surface other than the bottom surface may be covered with an insulating film.

  In the unit cell 320a, a surface having a large area among the side surfaces is set as a main surface 320S1, and the main surfaces 320S1 of the adjacent unit cells 320a are arranged to face each other with a spacer 320b therebetween, whereby the cell stack 32 is formed. Composed. In the cell stack 32, the pair of side surfaces 320S2 of the unit cell 320a form an upper surface and a bottom surface.

  Next, the spacer 320b is a member made of an insulating material such as synthetic resin, and is formed around the main plate portion 320b1 sandwiched between the main surfaces 320S1 of the unit cells 320a and the main plate unit 320b1, and the arrangement of the unit cells 320a. A side plate portion 320b2 that protrudes in both directions along the direction and covers the bottom surface of the unit cell 320a and the pair of side surfaces 320S2.

  As a result, the electrode terminals 320a3 and 320a4 and the safety valve 320a5 are exposed to the side surface of the cell stack 32 in a state where the unit cells 320a and the spacers 320b are arranged adjacent to each other.

  In the cell stack 32, the unit cells 320a and the spacers 320b in an integrated state are sandwiched between a pair of end plates 321a respectively disposed at both ends of the stack along the arrangement direction.

  Further, stack bars 322a and 322b are arranged on the side surface parallel to the XY plane in the drawing of the cell stack 32 so as to be vertically symmetrical with respect to the arrangement direction of the unit cells, and the left side of the axis. That is, two sets of stack bars 322c are arranged on the bottom surface of the cell stack 32, which is a plane parallel to the ZY plane in the drawing.

  The stack bars 322a to 322c are substantially U-shaped members facing the pair of end plates 321a and having the same configuration except for the arrangement in the cell stack 32, and are attached to the periphery of the end plate 321a. The holes are fixed by fastening with fastening bolts 323.

  A synthetic resin spacer 320 c is disposed between the end plate 321 a and the cell stack 32.

  Next, the bus bar assembly unit 33 is a member made of synthetic resin or the like having insulation properties and resistance to corrosion by an electrolytic solution, such as polypropylene, and corresponds to the outer shape of the side surface of the cell stack 32 near the lid portion 320a2. It has the 1st frame 33a and the 2nd frame 33b. The first frame 33a holds the metal bus bars 332a, 332b and 332c connected to the electrode terminals 320a3 and 320a4 of the cell stack 32, and has an opening 33a1 formed corresponding to the arrangement position of the safety valve 320a5. Have. In addition, as a material of the frame 330a, you may make it use the synthetic resin which has insulation and heat resistance, such as PBT resin.

  The periphery of the bus bars 332a, 332b, and 332c is insulated by the first frame 33a. The second frame 33b is a member that covers and covers the surfaces of the first frame 33a and the bus bars 332a, 332b, and 332c, and the entire surface functions as a resin base, such as an end plate and a stack bar. It becomes possible to dispose metal parts and members such as restraints, metal containers, and lids while being insulated from the bus bars 332a, 332b, and 332c. Furthermore, it is possible to mount a harness or other electrical component that is electrically connected to the cell stack 32.

  1 and subsequent figures, for ease of explanation, BMU (Battery Management Unit) and other electrical components provided in the housing for managing the charge / discharge of the cell stack, and the negative electrode of the housing The bus bar and other electrical wirings connecting the terminal 21a and the positive electrode terminal 21b to the cell stack 32 are omitted.

  In the power pack 1 having the above configuration, the power pack 1 corresponds to the power pack of the present invention, and the power module main body 30 corresponds to the power module of the present invention. The housing corresponds to the housing of the present invention, the single cell 320a corresponds to the power storage element of the present invention, and the cell stack 32 corresponds to the cell stack of the present invention.

  The bus bar assembly unit 33 corresponds to the bus bar holder of the present invention, the first frame 33a corresponds to the first holder member of the present invention, and the second frame 33b corresponds to the second holder member of the present invention. It corresponds to.

  The power supply pack 1 according to the present embodiment having such a configuration has a gas flow path for leading exhaust gas from the cell stack 32 to the outside in the bus bar assembly unit 33 constituting the power supply module main body 30 in combination with the cell stack 32. Is formed.

  That is, as shown in FIG. 3, in the power supply module main body 30, the bus stack assembly 33 is disposed on the side surface of the cell stack 32, but the bus bar assembly unit 33 has the first frame 33 a as the cell stack 32. As shown in the exploded view of the main part of FIG. 4, the opening 33a1 of the first frame 33a overlaps the row formed by the safety valve 320a5 of the battery 320a. Arranged.

  On the other hand, the second frame 33b combined with the first frame 33a is a main surface facing the first frame 33a as shown in the exploded perspective views of the bus bar assembly unit 33 in FIG. 4 and FIG. On 33b1, it has the groove part 33x formed toward the upper direction from the center.

  In a state where the first frame 33a and the second frame 33b are combined, one end of the groove 33x near the center of the main surface 33b1 overlaps the center of the opening 33a1 of the first frame 33a. In addition, the area | region L shown in FIG. 5 shows the area | region which the opening 33a1 occupies on the main surface 33b1, and the groove part 33x is the longitudinal direction of the opening 33a1 which has a rectangular outline seeing from the main surface 33b1, ie, the cell 320a. It is orthogonal to the arrangement direction of the safety valve 320a5. On the other hand, the remaining portion of the groove 33x overlaps the main surface 33a2 of the first frame 33a, thereby sealing the periphery thereof.

  Accordingly, in the bus bar assembly unit 33, the first cavity surrounded by the opening 33a1 of the first frame 33a and the main surface 33b1 of the second frame 33b, and the groove 33x of the second frame 33b. And the 2nd cavity enclosed by the main surface 33a2 of the 1st frame 33a is formed. Further, the groove 33x reaches the edge of the second frame 33b, so that it is exposed as an exhaust port 31 on the upper surface of the power supply module body 30 as shown in FIG. As a result, the first cavity and the second cavity formed in the bus bar assembly unit 33 function as a gas flow path communicating from the safety valve 320a5 of the cell stack 32 to the exhaust port 31.

  FIG. 6 is a cross-sectional view of the bus bar assembly unit 33 parallel to the ZX plane in the drawing. As shown in FIG. 6, the gas flow path P travels straight through the first cavity when viewed from the X-axis direction intersecting the Z-X plane in the figure, which indicates the thickness of the bus bar assembly unit 33. After extending from 320a5 by the thickness of the first frame 33a, it moves into the second cavity, bends upward, extends along the bottom surface 33b2 of the groove 33x, and reaches the exhaust port 31 at the upper end. Further, as shown in FIG. 5, the gas flow path P is formed in the longitudinal direction of the rectangular region L along the arrangement direction of the plurality of safety valves 320a5 of the cell stack 32 in the first cavity, and both ends thereof are It branches off from the middle part to the groove 33x side that forms the second cavity.

  In the above configuration, the region formed by the second cavity overlapping the first cavity corresponds to the first opening of the present invention. The exhaust port 31 corresponds to a second opening of the present invention.

  The power supply pack of the present embodiment having the gas flow path as described above has the following effects. That is, in a conventional battery pack (cell stack), an exhaust pipe for leading exhaust gas from a single cell safety valve is attached to the cell stack as an independent member such as a pipe. This corresponds to the arrangement of the safety valve that is the mounting source, and the degree of freedom in designing the exhaust pipe in the power supply module has been hindered.

  As an example in which the degree of freedom is hindered, the direction of the gas exhausted from the exhaust pipe is limited to the arrangement direction of the cells in the cell stack because the exhaust pipe matches the arrangement direction of the safety valves. This causes inconvenience when the position of the exhaust tube of the housing does not match the arrangement of the single cells. Specifically, as shown in FIGS. 1 and 4, due to the relationship between the dimensions inside the housing and the dimensions of the cell stack 32 accommodated in the housing, the arrangement of the safety valves 320a5 of the cell stack 32 and the position of the exhaust cylinder 22 are It may not fit. If the gas discharged from the exhaust pipe inside the housing is not directed to the position of the exhaust tube of the housing, the exhaust efficiency of the housing is lowered, and the gas may be filled inside the housing. Furthermore, in order to prevent this, connecting the exhaust pipe and the exhaust cylinder of the housing by a hose, a pipe or the like may allow the housing efficiency of the housing to be lowered or increase the cost of the power supply module.

  On the other hand, in the first embodiment, the gas flow path P is located on the side surface of the cell stack 32 and is used for electrical connection between the single cells, and for the placement of metal parts and electrical components. By being formed inside the provided bus bar assembly unit 33, it can be formed on the plane of the cell stack 32, and the degree of freedom of the gas flow path can be improved. Specifically, as shown in FIGS. 4 and 5, the gas flow through the gas flow path P is parallel to the ZX plane in the figure, and the lid 320 a 2 of the unit cell 320 a that constitutes the cell stack 32. When viewed from the arrangement plane, the grooves gather at one end of the groove 33x along the Y-axis direction in the figure from the longitudinal direction of the opening 33a1 that is the starting point, and extend to the exhaust port that is the other end of the groove part 33x perpendicular to the Z direction in the figure. It reaches. Here, in the gas flow path P, the portion constituted by the second cavity formed by the groove 33x or the like is a safety valve that matches the longitudinal direction of the first cavity formed by the opening 33a1 or the like when viewed from the arrangement surface of the lid 320a2. The path is orthogonal to the arrangement direction of 320a5.

  Further, as shown in FIG. 6, when viewed from a direction orthogonal to the Z-X plane in the drawing, the gas flow proceeds straight as it is ejected from the safety valve 320a5, and reaches one end of the groove 33x of the second frame 33b. And bent upward from the bottom surface 33b2 to reach the exhaust port 31 which is the other end of the groove 33x. Here, the portion constituted by the second cavity formed by the groove 33x or the like is a path orthogonal to the gas ejection direction from the safety valve 320a5.

  In the above description, the gas flow path P is shown as an aspect perpendicular to the arrangement direction of the safety valve 320a5 when viewed from the arrangement surface of the lid part 320a2 by the groove 33x, but in the schematic diagram of FIG. As indicated by the arrow R, it can be formed at an arbitrary rotation angle on the second frame 33b.

  Thereby, the gas flow path P takes the aspect cross | intersected with the arrangement direction of the safety valve 320a5 on the plane of the cell stack 32, and the exhaust port 31 is on the arbitrary places of the perimeter of the 2nd frame 33b. Therefore, the gas can be discharged at a location intersecting the arrangement of the safety valves 320a5. Here, the exhaust port 31 corresponds to a second opening of the present invention.

  Thus, according to the power supply module of the present embodiment, on the surface of the cell stack 32 including the safety valve 320a5, the gas flow path can be formed in any direction unrelated to the arrangement direction of the safety valve 320a5. It is possible to improve the degree of freedom in the gas discharge direction from the cell stack 32.

  Furthermore, according to the power supply module of the present embodiment, the gas flow path can be formed in a direction orthogonal to the direction of gas ejection from the safety valve 320a5, and the gas ejected from the safety valve 320a5 is transferred to the inner wall of the housing and the like. It is possible to prevent directly reaching the members constituting the power pack 1.

  Furthermore, in the present embodiment, since the power supply module body 30 has the above-described degree of freedom, the power supply module body 30 in the power supply pack 1 can direct the gas discharge direction toward the exhaust tube 22 of the lid portion 20 of the housing. This has the following effects. That is, the housing of the power supply pack 1 is a sealed container by closing the container main body 10 by the lid portion 20, and the internal space in which the power supply module main body 30 is accommodated communicates with the outside only through the exhaust tube 22. Is done. Therefore, the gas discharged from the power supply module main body 30 once stays in the housing, and then is discharged from the exhaust tube 22 to the outside, so that the gas derived from the electrolyte of the unit cell 320a stays in the housing for a long time. There is a risk of corroding the stack bar metal member or BMU and other electrical components.

  On the other hand, since the power supply module main body 30 of the present embodiment can determine the gas discharge destination with a desired location in the housing as a target, the gas staying in the housing can be quickly transferred to the exhaust cylinder 22 of the housing. Can lead. Therefore, it is possible to obtain a highly reliable power supply pack having excellent exhaust efficiency. Furthermore, when creating the power supply module, the gas discharge direction can be changed following the design of an existing housing in which the position of the exhaust stack is determined in advance, thereby improving the versatility of the power supply module in the power supply pack Is possible.

  In the above description, the housing has been hermetically sealed. However, the present embodiment may be realized by a housing having a structure communicating with the lid in addition to the exhaust tube 22. In this case, the exhaust port 31 and the exhaust cylinder 22 are separately connected so as to communicate with each other by a hose or a pipe. However, since it is possible to omit the pipe, it is possible to achieve a low cost, an improvement in housing efficiency, a reduction in weight, and the like, which is more preferable for a sealed configuration like the housing of the present embodiment. It is.

  Furthermore, the gas flow path of the present embodiment has the following effects by being configured with the bus bar assembly unit 33 used for electrical connection between the cells and mounting of electrical components in the power supply module as a wall body. . That is, by forming the gas flow path not in the exhaust pipe which is an independent part but in the part having other functions of the power supply module, it is possible to reduce the number of parts in the power supply module and simplify the manufacturing. Become. Furthermore, the power module can be reduced in size and weight.

  Further, the bus bar assembly unit 33 constituting the gas flow path of the present embodiment is constituted by the first frame body 33a and the second frame body 33b, thereby providing the following effects. That is, as shown in FIG. 6, the opening of the first frame 33 a on the side that directly contacts the unit cell 320 a is provided so as to cover the arranged safety valves 320 a 5, while the gas flow path leading to the exhaust port 31 is provided. The shape is determined by the shape of the groove 33x of the second frame 33b.

  Thereby, the configuration on the first frame 33a side is shared for gas accumulation, and the configuration on the second frame 33b side is allocated for gas flow adjustment, thereby simplifying the gas flow path. Thus, the productivity of the power supply module of the present invention can be improved.

  In the above description, the gas flow path of the present embodiment is configured using the wall of the bus bar assembly unit 33 as exemplified by the groove 33x. As long as the road is adjacent to the surface including the safety valve of the unit cell on the cell stack, it is configured using any parts and members as components constituting the power supply module such as the electrical component subunit. What is necessary is not limited by the specific function of the component of the power supply module including the gas flow path.

  Further, the gas flow path is constituted by a combination of two components of the first frame body 33a adjacent to the cell stack 32 and the second frame body 33b having the groove 33x forming the gas flow path. However, as long as the gas flow path of the present invention is adjacent to the surface including the safety valve of the unit cell, it is not limited by the specific coupling mode of the components constituting the power supply module such as the electrical component subunit. Absent. It may be a single part or a combination of three or more parts.

  In the above description, the gas flow path P is formed as a straight line having the shortest distance to the exhaust port 31 and intersects with the arrangement direction of the safety valves 320a5 in the cell stack 32. The path may be all or partly intersected with the safety valve arrangement. In other words, the gas flow path of the present invention can be freely laid out regardless of the arrangement of the safety valves, and as a result, it is allowed that a part of the gas flow path is formed coincident with or parallel to the arrangement of the safety valves. included.

  As an example, the configuration example of FIG. 8 has a first member 40a having openings 40a1 corresponding to the arrangement of the safety valves 320a5 as a part 40 adjacent to the cell stack 32, and a mode bent in a substantially U-shape. , And a second member 40b formed with a groove 40x partly parallel to the arrangement of the safety valves 320a5. By adopting such a configuration, it is possible to flexibly form a gas flow path in consideration of restrictions based on the type of component 40. Specifically, if the component 40 is an electrical component sub-unit, the bus bar, the arrangement of other electrical components, the bus bar assembly unit, the bus bar arrangement, or the end plate such as the connection position with the stack bar In consideration of the components that are given priority in the configuration of 40, the gas flow path can be formed so as to prevent the groove 40x from interfering with the arrangement and position of these portions.

  Further, in the above description, the gas flow path of the present invention is formed in a part having other functions of the power supply module as exemplified by the bus bar assembly unit 33. You may make it comprise as an exhaust pipe.

  In the above description, the housing of the present invention is a container having a rectangular parallelepiped shape, which is composed of the container body 10 and the lid 20 made of synthetic resin. On the other hand, the housing may be realized as a metal or other material and a combination thereof, and may be realized as a combination of three or more members. Further, the outer shape of the housing may be a cube, a cylinder, or a polygonal column. In short, the housing of the present invention is not limited by its shape, specific material or configuration.

  Further, the exhaust tube 22 provided in the housing is an example of the exhaust port of the present invention. However, the exhaust port of the present invention may have any shape, size, etc. as long as it can communicate between the outside and the inside of the housing. Well, it is not limited to the shape of the cylindrical exhaust tube 22 of the present embodiment. As an example, you may implement | achieve as an opening which does not have the height (length) provided in the wall body.

  In the above description, the storage element of the present invention as a unit cell constituting the cell stack is a non-aqueous electrolyte secondary battery represented by a lithium ion secondary battery, but is charged by an electrochemical reaction. As long as the battery can be discharged, a nickel metal hydride battery or other various secondary batteries may be used. Moreover, a primary battery may be sufficient. Furthermore, an electric double layer capacitor and other various capacitors may be used. In short, the power storage element of the present invention is not limited by a specific method for generating electromotive force as long as it is an element capable of accumulating electricity formed by sealing an electrode body and an electrolyte in a storage container. .

  In short, the present invention may be implemented by adding various modifications to the above-described embodiment, including those described above, as long as they do not depart from the spirit of the present invention.

  The present invention as described above has an effect that the degree of freedom in the gas discharge direction can be improved in the power supply module, and is useful in a power supply module having a storage element such as a secondary battery.

DESCRIPTION OF SYMBOLS 1 Power supply pack 10 Container main body 20,320a2 Cover part 21a, 21b, 320a3 Electrode terminal 22 Exhaust cylinder 30 Power supply module main body 31 Exhaust port 32 Cell stack 33 Bus bar assembly unit 33a 1st frame 33b 2nd frame 33a1, 40a1 Opening 33b1, 33a2, 320S1 Main surface 33b2 Bottom surface 33x, 40x Groove 40 Component 40a First member 40b Second member 320S2 Side surface 320a Cell 320a1 Exterior body 320b, 320c Spacer 320b1 Main plate 320b2 Side plate 320a5 Safety valve 320a6 Sealing Plug 321a End plate 322a, 322c, 322a-322c Stack bar 323 Fastening bolt 332a, 332b Bus bar

Claims (7)

By energy storage device having a safety valve is arranged at a plurality predetermined direction, and the cell stack that includes a plurality of said safety valve being arranged in the same plane depending on the arrangement of the plurality of storage elements,
A stack of the cell stack on the surface on which the safety valves are arranged, and a bus bar holder for holding a bus bar for connecting the storage elements to each other .
Gas flow passage which the gas flows discharged from the safety valve on the surface of the cell stack in which the safety valve is arranged is formed in the bus bar holder,
The gas flow path crosses all or part of the arrangement of the safety valves, and discharges gas through a first opening provided in the middle of the arrangement of the safety valves.
Power supply module. The gas flow path causes gas to be discharged via a second opening provided in a direction intersecting with the arrangement of the safety valves.
The power supply module according to claim 1. The gas flow path is formed along a plane intersecting the direction in which gas is ejected from the safety valve.
The power supply module according to claim 1 or 2. The bus bar holder is
A first holder member formed with an opening surrounding the safety valves arranged;
A second holder member that overlaps with the opening and has a groove that reaches the edge;
The gas flow path is formed by the opening and wall of the first holder member, and the groove and wall of the second holder member.
The power supply module according to claim 1 . The second holder member is insulative and covers at least the surface of the bus bar opposite to the surface facing the cell stack;
The power supply module according to claim 4 . A power supply module according to any one of claims 1 to 5 ,
A housing for housing the power supply module,
The housing has an exhaust port communicating from the inside to the outside,
The opening of the gas flow path is directed to the exhaust port of the housing;
Power pack. The housing is sealed and communicates only through the exhaust port;
The power pack according to claim 6 .

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