JP6274052B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device including one or more power storage elements.

  In a power storage device including one or more power storage elements, a configuration for forming an exhaust passage from a safety valve or the like included in each power storage element is known.

  For example, Patent Document 1 discloses an assembled battery that includes a plurality of unit cells and includes an exhaust duct that extends in the arrangement direction of the unit cells. This exhaust duct is provided with a gas inlet at a position corresponding to the gas discharge valve of each unit cell in the longitudinal direction, and a gas outlet is provided at an end in the longitudinal direction.

JP 2014-72091 A

  An object of this invention is to provide the electrical storage apparatus which can discharge | emit the exhaust_gas | exhaustion from the safety valve of an electrical storage element efficiently.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention includes a power storage element having an electrode terminal and a safety valve, a partition wall portion disposed at a position facing the safety valve, and exhaust from the safety valve. And a cover member that forms a flow path that guides the electrode in the direction of the electrode terminal.

  According to this configuration, when the safety valve of the power storage element is opened, the exhaust from the safety valve is guided toward the electrode terminal by the cover member. Therefore, for example, even when one or more other members are arranged on the side of the power storage element (the side in the direction intersecting the direction connecting the safety valve and the electrode terminal), these members are straddled. Without exhausting (without exceeding), the exhaust can be quickly moved away from the storage element.

  Further, the flow of exhaust gas from the safety valve is directed in the direction of the electrode terminal along the partition wall at a position facing the safety valve. This prevents the exhaust from directly colliding with a member arranged outside the cover member. Further, the temperature of the exhaust is lowered.

  That is, the power storage device of this aspect can efficiently discharge the exhaust from the safety valve of the power storage element. Further, when the exhaust gas is released, the member outside the cover member and existing on the safety valve side of the power storage element can be protected from the heat or impact of the exhaust gas.

  Thus, according to the power storage device of this aspect, exhaust from the safety valve can be efficiently released.

  Further, in the power storage device according to one aspect of the present invention, the cover member is further disposed between the safety valve and the electrode terminal, and the flow of the exhaust gas guided toward the electrode terminal is changed to the power storage element. It is good also as having the conversion surface part which forms the surface converted in the direction away from.

  According to this configuration, the exhaust gas guided from the safety valve toward the electrode terminal flows away from the power storage element by flowing along the conversion surface portion. That is, the electrode terminal is protected from the heat or impact of the exhaust. Thereby, for example, the occurrence of a defect in the electrode terminal mounting portion in the electrode terminal or a defect in the connection portion between the electrode terminal and the conductive member (such as a bus bar) due to exhaust from the safety valve is suppressed.

  Further, in the power storage device according to one aspect of the present invention, the electrode terminal and the safety valve are disposed on the same surface of the power storage element, and from the surface of the conversion surface portion where the electrode terminal is disposed. The maximum value of the height may be larger than the height of the electrode terminal from the surface.

  According to this configuration, since the exhaust from the safety valve is discharged to a position higher than the electrode terminal by the conversion surface portion, the electrode terminal or a member around the electrode terminal (such as a resin packing) is more reliably heated. Can be protected from etc.

  Further, in the power storage device according to one embodiment of the present invention, the conversion surface portion may form the surface inclined so as to move away from the power storage element as approaching the electrode terminal from the safety valve.

  According to this configuration, since the conversion surface portion forms an oblique surface with respect to the direction connecting the safety valve and the electrode terminal, the conversion surface portion absorbs the impact of the exhaust gas from the safety valve and changes the direction of the exhaust gas. Can be converted. Further, since the exhaust gas whose direction of flow has been converted by the conversion surface portion is directed in the oblique direction, the exhaust gas collides with the surface of a member disposed outside the cover member from the oblique direction, for example. Therefore, possibility that the said member will be damaged by exhaust_gas | exhaustion is reduced more.

  The power storage device according to one embodiment of the present invention may include a plurality of the power storage elements, and the cover member may include at least one conversion surface portion corresponding to each of the plurality of power storage elements.

  According to this configuration, since the cover member is provided with the conversion surface portion corresponding to each of the plurality of power storage elements, the exhaust is efficiently exhausted while protecting the electrode terminals of each of the plurality of power storage elements from the exhaust. It becomes possible to release.

  Further, in the power storage device according to one aspect of the present invention, the power storage element includes the two electrode terminals, and the cover member includes the conversion surface portion between the safety valve and each of the two electrode terminals. You may have.

  According to this configuration, the exhaust from the safety valve of the electricity storage element flows in the direction of the two electrode terminals, and the two electrode terminals are protected from the exhaust by the corresponding conversion surface portions. Accordingly, the exhaust can be efficiently discharged while protecting the two electrode terminals from the exhaust.

  Further, in the power storage device according to one aspect of the present invention, the cover member is further disposed between the electrode terminal and the region facing the safety valve in the partition wall and the electrode element side. It is good also as having the discharge part which forms the opening which connects this space and the external space of the said cover member.

  According to this configuration, the discharge portion having the opening connecting the inside and the outside of the cover member is disposed between the electrode terminal and the region facing the safety valve in the partition wall portion, so that the exhaust from the safety valve can be efficiently performed by the electrode. It can lead to the direction of the terminal.

  The power storage device according to one embodiment of the present invention may include a plurality of the power storage elements, and the cover member may include at least one discharge unit corresponding to each of the plurality of power storage elements.

  According to this configuration, the cover member is provided with the discharge portion corresponding to each of the plurality of power storage elements, and thus an exhaust flow is formed for each power storage element. That is, the exhaust from the safety valve of these power storage elements can be efficiently released.

  In the power storage device according to one embodiment of the present invention, the plurality of power storage elements are arranged in a first direction, and in each of the plurality of power storage elements, the safety valve and the electrode terminal are in the first direction. The distance between the safety valve and the discharge portion may be shorter than the width in the first direction of the plurality of rows of the power storage elements.

  According to this configuration, the efficiency of exhaust emission is improved as compared with the conventional method of releasing exhaust gas by forming a flow path of exhaust gas from the safety valve of these energy storage elements in the direction in which the plurality of energy storage elements are arranged.

  In the power storage device according to one embodiment of the present invention, the power storage element includes the two electrode terminals, the cover member includes a region facing the safety valve in the partition wall, and each of the two electrode terminals. The discharge part may be provided between the two.

  According to this configuration, the exhaust from the safety valve of the power storage element flows in the direction of the two electrode terminals and flows to the outside of the cover member from the two discharge portions. Thereby, the exhaust from the safety valve of the electricity storage element can be released more efficiently.

  Further, in the power storage device according to one aspect of the present invention, the partition wall has a taper that protrudes in the direction of the safety valve and forms a slope that moves away from the power storage element as it approaches the electrode terminal. It is good.

  According to this configuration, the flow of exhaust gas from the safety valve of the electricity storage element can be more reliably guided toward the electrode terminal. Further, since the thickness of the partition wall can be increased by the presence of the tapered portion, for example, the resistance of the partition wall to the heat or impact of the exhaust from the safety valve can be improved.

  The power storage device according to one embodiment of the present invention includes a plurality of the power storage elements, and electrode terminals of at least two power storage elements of the plurality of power storage elements are connected by a bus bar, and the cover member Furthermore, it is good also as having a positioning part which positions the said bus bar with respect to the electrode terminal of each of the said at least 2 said electrical storage element.

  According to this configuration, since the cover member can position the bus bar with a simple configuration, for example, when manufacturing the power storage device, the bus bar can be easily joined to the electrode terminal of the power storage element. In other words, a member (for example, referred to as “bus bar frame”) that is structurally related to the bus bar can have a function of efficiently discharging exhaust gas from the safety valve of the power storage element. In addition, since the bus bar frame and the exhaust emission member are also used, for example, it is possible to suppress an increase in the number of parts of the power storage device.

  In the power storage device according to one embodiment of the present invention, the cover member may further include a heat insulating member or a heat resistant member arranged in the partition wall.

  According to this structure, the tolerance with respect to the heat | fever or the impact of the exhaust_gas | exhaustion from a safety valve of a partition part can be improved.

  In addition, the power storage device according to one embodiment of the present invention may further include an exterior body formed of a resin that houses the power storage element and the cover member.

  According to this configuration, the exterior body can be protected from the heat or impact of the exhaust from the safety valve by the partition wall of the cover member. That is, the resin-made exterior body that may cause a decrease in strength or the like due to exhaust heat or impact is protected by the partition wall.

  In the power storage device according to one embodiment of the present invention, the exterior body may include a first exterior body and a second exterior body that are joined to each other so as to seal the inside.

  According to this configuration, for example, leakage of exhaust discharged from the power storage element to the outside of the exterior body is suppressed. Moreover, when the exterior body is provided with a discharge port, leakage of exhaust gas from other than the discharge port is suppressed. That is, unintentional outflow of exhaust gas from the exterior body is suppressed.

  Therefore, for example, a structure for connecting the exhaust pipe connected to the safety valve to the discharge port of the exterior body is not necessary. In addition, for example, even when a plurality of openings (discharge portions) are provided in the cover member corresponding to each of the one or more power storage elements, the exhaust discharged from each discharge portion is processed in an intended manner. It can be done (contained at a reduced temperature, or safely released to the outside of the exterior body, etc.).

  In the power storage device according to one embodiment of the present invention, the cover member may be disposed in a state where a gap is formed at least at a part between the cover member and the inner surface of the exterior body.

  According to this configuration, for example, when high-temperature exhaust is ejected from the safety valve, conduction of heat from the cover member to the exterior body is suppressed. That is, the exterior body is protected from the heat of the exhaust.

  In the power storage device according to one embodiment of the present invention, the partition wall portion may have a thicker portion that is thicker than other portions of the cover member.

  According to this structure, the tolerance with respect to the high temperature exhaust gas which ejects from a safety valve of a partition part can be improved.

  A power storage device according to one embodiment of the present invention intersects the first direction with a plurality of power storage elements arranged in a first direction, each having a safety valve, and exhaust from the safety valve of each of the plurality of power storage elements. A cover member that forms a flow path that leads in a direction, the cover member being disposed at a position facing each safety valve of each of the plurality of power storage elements, and the plurality of power storage element sides of the cover member Each of the plurality of power storage elements and the at least one discharge portion has a distance between the safety valve and the at least one discharge portion. The width of the row of the plurality of power storage elements may be shorter than the width in the first direction.

  According to this configuration, for example, compared with the conventional method of forming a flow path for exhaust emission from the safety valve of these energy storage elements in the direction in which the plurality of energy storage elements are arranged, the path length for exhaust emission is reduced. Can be shortened. Therefore, exhaust emission efficiency can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage apparatus which can discharge | release the exhaust from the safety valve of an electrical storage element efficiently outside can be provided.

It is a perspective view which shows the external appearance of the electrical storage apparatus which concerns on embodiment. It is a disassembled perspective view which shows each component at the time of decomposing | disassembling the electrical storage apparatus which concerns on embodiment. It is a 1st perspective view which shows the structure of the electrical storage unit which concerns on embodiment. It is a 2nd perspective view which shows the structure of the electrical storage unit which concerns on embodiment. It is a perspective view which shows the structure of the electrical storage element which concerns on embodiment. It is a perspective view which shows the external appearance of the bus-bar frame which concerns on embodiment. It is a perspective view which shows the structure which concerns on formation of the flow path of the exhaust_gas | exhaustion in the bus-bar frame which concerns on embodiment. It is sectional drawing which shows the structure which concerns on formation of the flow path of the exhaust_gas | exhaustion in the bus-bar frame which concerns on embodiment. It is a schematic diagram which shows the flow path of the exhaust for every electrical storage element which concerns on embodiment. It is a 3rd perspective view which shows the structure of the electrical storage unit which concerns on embodiment. It is a disassembled perspective view which shows the positional relationship of the control part of a bus-bar frame, and the engaging part of a spacer. It is a fragmentary sectional view which shows the mode of attachment to the aggregate | assembly of the electrical storage element 100 of the bus-bar frame which has a holding | suppressing part. It is sectional drawing which shows the structure outline | summary of the bus-bar frame which concerns on the modification 1 of embodiment. It is sectional drawing which shows the structure outline | summary of the bus-bar frame which concerns on the modification 2 of embodiment.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Note that each drawing is a diagram for explaining the power storage device according to the embodiment or its modification, and is not necessarily illustrated strictly.

  The embodiment described below shows a specific example of the present invention. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, assembling methods, assembling orders, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements according to the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

(Embodiment)
First, a configuration outline of the power storage device 1 will be described with reference to FIGS.

  FIG. 1 is a perspective view showing an appearance of power storage device 1 according to the embodiment of the present invention. FIG. 2 is an exploded perspective view showing each component when the power storage device 1 according to the embodiment of the present invention is disassembled.

  In these figures, the Z-axis direction is shown as the vertical direction, and the Z-axis direction will be described below as the vertical direction. However, depending on the usage, the Z-axis direction may not be the vertical direction. The axial direction is not limited to the vertical direction.

  The power storage device 1 includes one or more power storage elements, and is a device that can charge electricity from the outside and discharge electricity to the outside. For example, the power storage device 1 is a battery module used for power storage use, power supply use, and the like.

  As shown in these drawings, the power storage device 1 includes an exterior body 10 including a first exterior body 11 and a second exterior body 12, and an electrical storage unit 30 and an electric device 40 accommodated inside the exterior body 10. ing.

  The exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage device 1 and is disposed outside the power storage unit 30 and the electric device 40. That is, the exterior body 10 arranges the power storage unit 30 and the electric device 40 at predetermined positions, and protects the power storage unit 30 and the electric device 40 from an impact or the like.

  In addition, the outer package 10 is made of resin in the present embodiment. Specifically, the exterior body 10 is made of, for example, an insulating resin such as polycarbonate or polypropylene (PP), and prevents the power storage unit 30 and the electric device 40 from coming into contact with an external metal member or the like. .

  The exterior body 10 includes a first exterior body 11 that constitutes a lid body of the exterior body 10 and a second exterior body 12 that constitutes the main body of the exterior body 10. The first exterior body 11 is a flat rectangular lid member that closes the opening of the second exterior body 12, and is provided with a positive external terminal 21 and a negative external terminal 22. The power storage device 1 charges electricity from the outside via the positive electrode external terminal 21 and the negative electrode external terminal 22, and discharges electricity to the outside.

  The second exterior body 12 is a bottomed rectangular cylindrical housing in which an opening is formed, and houses the power storage unit 30 and the electric device 40.

  In addition, the 1st exterior body 11 and the 2nd exterior body 12 may be formed with the member of the same material, and may be formed with the member of a different material.

  Moreover, in this Embodiment, the exterior body 10 is formed so that the inside may be sealed. Specifically, the 1st exterior body 11 and the 2nd exterior body 12 are mutually joined so that the inside may be sealed. For example, the periphery of the opening of the second exterior body 12 and the periphery of the first exterior body 11 are joined by heat welding.

  The exterior body 10 in the present embodiment further includes an exhaust pipe 13. The exhaust pipe 13 is an example of a discharge port that the exterior body 10 has. When gas is discharged from one of the safety valves of the plurality of power storage elements included in the power storage unit 30, the discharged gas (exhaust gas) is released to the outside of the power storage device 1 through the exhaust pipe 13. The configuration of the power storage element will be described later with reference to FIG.

  In addition, the inside of the exhaust pipe 13 or the vicinity of the end of the exhaust pipe 13 on the first exterior body 11 side prevents moisture from entering the inside from the outside, and allows exhaust from the inside to the outside. A valve or a membrane is arranged.

  The power storage unit 30 has a plurality of power storage elements in the present embodiment, and is connected to the positive external terminal 21 and the negative external terminal 22 provided on the first exterior body 11. In the present embodiment, as shown in FIG. 2, the power storage unit 30 is stacked in the Z-axis direction and arranged in the second exterior body 12 with a plurality of power storage elements placed horizontally. The power storage unit 30 is accommodated inside the exterior body 10 by covering the first exterior body 11 from above. The configuration of the power storage unit 30 will be described later with reference to FIGS. 3 and 4.

  The electric device 40 is a rectangular device in which a circuit board, a relay, and the like are arranged on the inside, and is arranged on the side of the power storage unit 30 (X-axis direction plus side). In the present embodiment, as shown in FIG. 2, the electric device 40 is erected in the Z-axis direction with the circuit board placed vertically, and is disposed in the second exterior body 12. The electrical device 40 is accommodated inside the exterior body 10 by covering the first exterior body 11 from above.

  The circuit board provided in the electric device 40 is connected to the positive terminal or the negative terminal of each power storage element in the power storage unit 30 by wiring (lead wire). For example, the charge state or the discharge state (voltage) of the power storage element , Battery status such as temperature), etc., and monitor and control.

  Next, the structure of the electrical storage unit 30 is demonstrated using FIG.3 and FIG.4.

  3 and 4 are first and second perspective views showing the configuration of the power storage unit 30 according to the embodiment of the present invention. Specifically, FIG. 3 is an exploded perspective view showing a configuration when the bus bar frame 500 and the bus bar 32 are separated from the power storage unit 30. FIG. 4 is an exploded perspective view showing each component when the components separating the bus bar frame 500 and the bus bar 32 from the power storage unit 30 are further disassembled.

  In these figures and the following figures, for convenience of explanation, the Y-axis direction is shown as the vertical direction, and there is a place where the Y-axis direction is described as the vertical direction. The Y-axis direction is not always the vertical direction.

  As shown in these drawings, the power storage unit 30 includes a plurality of power storage elements 100 (eight power storage elements 100 in the present embodiment), a plurality of spacers 200 (seven spacers 200 in the present embodiment), and A pair of clamping members 300, a plurality of restraining members 400 (four restraining members 410 to 440 in the present embodiment), a bus bar frame 500, and a plurality of bus bars 32 (in the present embodiment, five bus bars 32). ).

  The power storage element 100 is a secondary battery (unit cell) that can charge and discharge electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. . The power storage element 100 has a flat rectangular shape and is disposed adjacent to the spacer 200. That is, each of the plurality of power storage elements 100 is alternately arranged with each of the plurality of spacers 200 and arranged in the first direction (Z-axis direction).

  In the present embodiment, the power storage element 100 is disposed laterally inside the outer package 10 (see FIG. 2). However, in FIG. It has shown in the state arrange | positioned toward. In addition, the electrical storage element 100 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it. The detailed configuration of the power storage element 100 will be described later with reference to FIG.

  The spacer 200 is an insulating plate-like member that is disposed between two adjacent power storage elements 100 and formed of a resin or the like that insulates between the two power storage elements 100. In the present embodiment, seven spacers 200 are arranged for eight power storage elements 100. The spacer 200 is formed of an insulating resin such as polycarbonate or polypropylene (PP), but may be formed of any material as long as it is a member having an insulating property.

  Spacer 200 is formed so as to cover approximately half of the front side or back side of storage element 100 (substantially half when divided into two in the Z-axis direction). That is, a recess is formed on both the front side or the back side (both sides in the Z-axis direction) of the spacer 200, and approximately half of the power storage element 100 is inserted into the recess.

  With such a configuration, the two spacers 200 sandwiching the power storage element 100 cover most of the power storage element 100, so that the spacer 200 allows the power storage element 100 and another member having conductivity to be interposed. Insulation can be improved. In addition, the spacer 200 and the energy storage device 100 adjacent to the spacer 200 are in a relationship of restricting the lateral movement (movement in the direction parallel to the XY plane). This relationship is continuous in the direction in which the power storage elements 100 and the spacers 200 are alternately arranged (Z-axis direction). Therefore, each spacer 200 also functions as a member that stabilizes the positions of the plurality of power storage elements 100 arranged in the Z-axis direction.

  The sandwiching member 300 includes a pair of sandwiching members 310 and 320 that are flat plate-like members, and sandwiches and holds the plurality of power storage elements 100 from both sides in the arrangement direction (Z-axis direction) of the plurality of power storage elements 100.

  That is, the clamping member 310 is a flat plate-like member that is disposed on the positive side in the Z-axis direction relative to the power storage element 100 that is disposed on the most positive side in the Z-axis direction among the plurality of power storage elements 100. Further, the clamping member 320 is a flat plate-like member that is disposed on the minus side in the Z-axis direction with respect to the electricity storage element 100 that is disposed on the most minus side in the Z-axis direction among the plurality of power storage elements 100. The sandwiching member 310 and the sandwiching member 320 sandwich and hold the plurality of power storage elements 100 and the plurality of spacers 200 from both sides in the arrangement direction (Z-axis direction) of the plurality of power storage elements 100 and the plurality of spacers 200. .

  The clamping member 300 (the clamping members 310 and 320) is formed of a metal (conductive) member such as stainless steel or aluminum from the viewpoint of strength or the like. In addition, the sandwiching member 300 (the sandwiching members 310 and 320) ensures insulation from the power storage element 100 by disposing an insulating member between the adjacent power storage elements 100. Note that the clamping member 300 is not limited to a metal (conductive) member, and may be formed of, for example, an insulating member having high strength. Further, the sandwiching member 310 and the sandwiching member 320 may be formed of members of the same material, or may be formed of members of different materials.

  The restraining member 400 is a member that is attached to the sandwiching member 300 at both ends and restrains the plurality of power storage elements 100. That is, the restraining member 400 is disposed so as to straddle the plurality of power storage elements 100, and applies a restraining force in the arrangement direction (Z-axis direction) of the plurality of power storage elements to the plurality of power storage elements 100. The restraining member 400 is preferably formed of a metal member such as stainless steel or aluminum, for example, similarly to the clamping member 300, but may be formed of a member other than metal.

  Specifically, the restraining member 400 has one end attached to the holding member 310 and the other end attached to the holding member 320. Then, the restraining member 400 applies a restraining force in the arrangement direction of the plurality of power storage elements 100 and the plurality of spacers 200 to the plurality of power storage elements 100 and the plurality of spacers 200.

  Here, the restraining member 400 includes restraining members 410 to 440. The restraining members 410 and 420 are disposed on both sides of the plurality of power storage elements 100 in the vertical direction (both sides in the Y-axis direction), and sandwich and restrain the plurality of power storage elements 100 from both sides. The restraining members 430 and 440 are arranged on both sides (both sides in the X-axis direction) of the plurality of power storage elements 100, and sandwich and restrain the plurality of power storage elements 100 from both sides.

  Specifically, the restraining member 410 and the restraining member 420 are a pair of long and flat members disposed on the plus side and the minus side in the Y-axis direction of the plurality of power storage elements 100. The restraining member 430 and the restraining member 440 are a pair of long and flat members disposed on the plus side and the minus side in the X-axis direction of the plurality of power storage elements 100.

  In addition, a plurality of through holes 411 that allow exhaust from the respective safety valves 170 to pass through are formed in the restraining members 410 arranged on the respective safety valves 170 side of the plurality of power storage elements 100. The exhaust gas passing through any one of the through holes 411 collides with a partition wall portion (described later with reference to FIGS. 6 to 8) of the bus bar frame 500, and changes the flow direction.

  The bus bar frame 500 is made of, for example, resin, and can insulate the bus bar 32 from other members, protect various wirings arranged in the power storage device 1, and regulate the position of the bus bar 32. It is a member.

  Specifically, the bus bar frame 500 is placed above the plurality of power storage elements 100 (Y-axis direction plus side) and positioned with respect to the plurality of power storage elements 100. The bus bar 32 is placed on the bus bar frame 500. At this time, the protrusions erected on the support portion 552 of the bus bar frame 500 are inserted into the openings formed in the bus bar 32, whereby the bus bar 32 is positioned with respect to the bus bar frame 500. As a result, the bus bar 32 is positioned with respect to the plurality of power storage elements 100 and joined to the electrode terminal of any one of the plurality of power storage elements 100.

  Note that the bus bar frame 500 according to the present embodiment is arranged in a state where a gap is formed at least partially between the inner surface of the exterior body 10. For example, a gap is formed between the bus bar frame 500 and the inner surface of the exterior body 10 by the outer surface of the bus bar frame 500 coming into contact with a rib provided upright on the inner surface of the exterior body 10.

  As a result, when high-temperature exhaust gas is ejected from the safety valve 170 of the electricity storage device 100, conduction of heat from the bus bar frame 500 to the exterior body 10 is suppressed. That is, the exterior body 10 is protected from the heat of the exhaust.

  In addition, bus bar frame 500 has a restricting portion in which movement to the opposite side to the plurality of power storage elements 100 is restricted by another member. In the present embodiment, the restricting portion engages with an engaging portion (first engaging portion 211 and second engaging portion 212, see FIG. 4) included in the spacer 200.

  In addition, bus bar frame 500 according to the present embodiment further has a function as a cover member that forms a flow path of exhaust from the safety valve of power storage element 100. Various features of the bus bar frame 500 including the function as the cover member will be described later with reference to FIGS.

  Bus bar 32 is a conductive member that is electrically connected to any electrode terminal of power storage elements 100. In the present embodiment, electrode terminals of at least two of the plurality of power storage elements 100 are connected by a bus bar 32.

  Although there is no particular limitation on the manner of electrical connection of the plurality of power storage elements 100, in this embodiment, four pairs of power storage elements 100 connected in parallel are formed, and the four pairs are connected in series. Yes. In addition, electrical connection between the power storage elements 100 and electrical connection between the eight power storage elements 100 and the positive external terminal 21 and the negative external terminal 22 are made via the bus bar 32.

  The bus bar 32 is made of, for example, aluminum as a conductive member, but the material of the bus bar 32 is not particularly limited.

  Next, the structure of the electrical storage element 100 is demonstrated using FIG.

  FIG. 5 is a perspective view showing a configuration of power storage element 100 according to the embodiment of the present invention. Specifically, FIG. 5 is a perspective view showing the inside of the electricity storage device 100 through the container 110 of the electricity storage device 100.

  As shown in FIG. 5, the energy storage device 100 includes a container 110, a positive electrode terminal 120, and a negative electrode terminal 130. In addition, an electrode body 140, a positive electrode current collector 150, and a negative electrode current collector 160 are disposed inside the container 110. In addition, although liquid, such as electrolyte solution, is enclosed in the inside of the container 110, illustration of the said liquid is abbreviate | omitted.

  The container 110 is composed of a rectangular cylindrical body made of metal and having a bottom, and a metal lid that closes the opening of the body. The container 110 can seal the inside by welding the lid portion and the main body after the electrode body 140 and the like are accommodated therein.

  A safety valve 170 is provided on the surface of the container 110 on which the electrode terminals (120, 130) are arranged. For example, as illustrated in FIG. 4, the plurality of power storage elements 100 are arranged such that the safety valves 170 are arranged in the arrangement direction (Z-axis direction) of the plurality of power storage elements 100.

  The safety valve 170 is opened when the internal pressure of the container 110 rises, and releases the gas inside the container 110. For example, when the power storage element 100 is a lithium ion secondary battery, high-temperature gas is released from the safety valve 170 at the time of abnormality. Specifically, the temperature of exhaust from the safety valve 170 may exceed 500 ° C.

  Note that not all of the plurality of power storage elements 100 included in the power storage device 1 include the safety valve 170, and it is sufficient that at least one power storage element 100 includes the safety valve 170.

  The electrode body 140 includes a positive electrode, a negative electrode, and a separator, and is a power generation element that can store electricity. Specifically, the electrode body 140 is a wound electrode body formed by winding what is arranged in layers so that a separator is sandwiched between a positive electrode and a negative electrode. The electrode body 140 may be a laminated electrode body in which flat plate plates are laminated.

  Here, the positive electrode is an electrode plate in which a positive electrode active material layer is formed on the surface of a long strip-like conductive positive electrode current collector foil made of aluminum or an aluminum alloy. The negative electrode is an electrode plate in which a negative electrode active material layer is formed on the surface of a long strip-like conductive negative electrode current collector foil made of copper or a copper alloy. The separator is a microporous sheet.

  Note that the positive electrode, the negative electrode, and the separator used for the energy storage device 100 are not particularly different from those conventionally used, and any known material can be used as long as the performance of the energy storage device 100 is not impaired. Further, the electrolyte solution (nonaqueous electrolyte) sealed in the container 110 is not particularly limited as long as it does not impair the performance of the power storage device 100, and various types can be selected.

  The positive electrode terminal 120 is an electrode terminal electrically connected to the positive electrode of the electrode body 140 via the positive electrode current collector 150, and the negative electrode terminal 130 is the negative electrode of the electrode body 140 via the negative electrode current collector 160. The electrode terminal is electrically connected to. In other words, the positive electrode terminal 120 and the negative electrode terminal 130 lead the electricity stored in the electrode body 140 to the external space of the power storage element 100, and also store the electricity in the internal space of the power storage element 100 in order to store the electricity in the electrode body 140. It is an electrode terminal made of metal for introducing.

  The positive electrode current collector 150 is a member that is disposed between the positive electrode of the electrode body 140 and the side wall of the container 110 and has electrical conductivity and rigidity that are electrically connected to the positive electrode terminal 120 and the positive electrode. The positive electrode current collector 150 is made of aluminum or an aluminum alloy as in the positive electrode current collector foil. The negative electrode current collector 160 is disposed between the negative electrode of the electrode body 140 and the side wall of the container 110, and has conductivity and rigidity that are electrically connected to the negative electrode terminal 130 and the negative electrode of the electrode body 140. It is a member. The negative electrode current collector 160 is made of copper or a copper alloy or the like, similarly to the negative electrode current collector foil.

  Next, the configuration of the bus bar frame 500 will be described with reference to FIGS.

  FIG. 6 is a perspective view showing an appearance of the bus bar frame 500 according to the embodiment.

  FIG. 7 is a perspective view showing a configuration relating to formation of an exhaust passage in bus bar frame 500 according to the embodiment.

  FIG. 8 is a cross-sectional view showing a configuration relating to formation of an exhaust passage in bus bar frame 500 according to the embodiment.

  FIG. 9 is a schematic diagram illustrating an exhaust flow path for each power storage element 100 according to the embodiment.

  In FIG. 7, in order to clearly show the characteristic configuration of the bus bar frame 500, a partially enlarged view when the bus bar frame 500 is cut along a plane parallel to the XY plane is shown. Illustration of (refer FIG. 4) is abbreviate | omitted. In FIG. 7, the illustration of the spacer 200 disposed in front of the power storage element 100 on the most front side (Z-axis direction plus side) is omitted.

  Further, in FIG. 8, in order to clarify the relationship between the structure of the bus bar frame 500 and the electrode terminals of the power storage element 100, the bus bar frame 500 is cut near the center in the thickness direction (Z-axis direction) of the power storage element 100. The partial cross section of the bus-bar frame 500 in the case of doing is shown. Moreover, in FIG. 8, the electrical storage element 100 is represented by the side view, and the safety valve 170 is typically illustrated by the rectangular area | region to which the dot was attached | subjected.

  As shown in FIGS. 6 to 9, the bus bar frame 500 has a partition wall portion 511 disposed at a position facing the safety valve 170 of the power storage element 100, and flows the exhaust from the safety valve 170 toward the electrode terminal. Form a road.

  That is, the partition wall portion 511 of the bus bar frame 500 functions as a shielding plate against exhaust from the safety valve 170. The exhaust from the safety valve 170 is guided toward the electrode terminal by the bus bar frame 500. Therefore, for example, exhaust can be discharged without straddling a plurality of power storage elements 100 arranged in a row in the arrangement direction (Z-axis direction). That is, the exhaust gas can be quickly moved away from the storage element 100 with the safety valve 170 opened. That is, the exhaust can be efficiently discharged.

  Further, the flow of exhaust gas from the safety valve 170 is directed in the direction of the electrode terminal along the partition wall portion 511 at a position facing the safety valve 170. This prevents the exhaust from directly colliding with members disposed outside the bus bar frame 500. Further, the temperature of the exhaust is lowered.

  Specifically, the exhaust from the safety valve 170 collides with the partition wall 511, so that a part of heat is taken away by the partition wall 511 and a part of kinetic energy is lost (the speed is reduced). In other words, in the present embodiment, exterior body 10 made of resin is protected from the heat or impact of the exhaust from safety valve 170 of power storage element 100 by partition 511 of bus bar frame 500. That is, the resin exterior body 10 that may cause a decrease in strength or the like due to exhaust heat or impact is protected by the partition wall 511.

  The partition wall portion 511 according to the present embodiment has a thick portion 511a that is thicker than other portions of the bus bar frame 500. Thereby, the tolerance with respect to the exhaust from the safety valve 170 of the electrical storage element 100 of the partition part 511 is improved.

  In the present embodiment, as shown in FIGS. 7 and 8, the exhaust from the safety valve 170 is guided in the directions of the two electrode terminals (the positive terminal 120 and the negative terminal 130).

  In addition, the bus bar frame 500 is disposed between the safety valve 170 and the electrode terminal (the positive electrode terminal 120 and the negative electrode terminal 130 are the same hereinafter), and the flow of the exhaust gas guided in the direction of the electrode terminal is transmitted from the power storage element 100. It has the conversion surface part 514 which forms the surface converted into the direction (for example, refer FIG. 8) which leaves | separates.

  That is, the exhaust gas guided from the safety valve 170 toward the electrode terminal flows away along the conversion surface portion 514, and is away from the power storage element 100. Therefore, the electrode terminal is protected from the heat or impact of the exhaust. Thereby, for example, the occurrence of a defect in the electrode terminal mounting portion or a defect in the connection portion between the electrode terminal and the bus bar 32 due to exhaust from the safety valve 170 is suppressed.

  For example, as illustrated in FIG. 8, the electrode terminal and the safety valve 170 are disposed on the same surface of the energy storage device 100, and the maximum height of the conversion surface portion 514 from the surface on which the electrode terminal is disposed. The value (the height of the apex on the Y axis direction plus side of the conversion surface portion 514 in FIG. 8) is larger than the height of the electrode terminal from the surface.

  That is, the exhaust from the safety valve 170 is discharged to a position higher than the electrode terminal by the conversion surface portion 514. Therefore, it is possible to protect the electrode terminals or the surrounding members (such as resin packing) from the heat of the exhaust.

  Here, in the present embodiment, an opening for forming an exhaust passage from the safety valve 170 toward the electrode terminal is formed in the bus bar frame 500. Specifically, the bus bar frame 500 includes a space on the side of the storage element 100 of the bus bar frame 500 and an external space of the bus bar frame 500 disposed between the electrode terminal and a region facing the safety valve 170 in the partition wall portion 511. A discharge portion 512 for forming an opening for connecting the two.

  That is, in the bus bar frame 500, the partition wall portion 511 constituting the wall on the safety valve 170 side of the power storage element 100 functions as a shielding plate against exhaust from the safety valve 170. Further, the exhaust gas that has collided with the partition wall portion 511 is guided in the direction of the electrode terminal through the opening of the discharge portion 512, and further travels away from the storage element 100. In such an exhaust flow path, the discharge unit 512 can efficiently guide the exhaust from the safety valve 170 toward the electrode terminal.

  In addition, conversion surface portion 514 according to the present embodiment forms a surface that is inclined so as to move away from power storage element 100 as it approaches electrode terminal from safety valve 170. That is, as shown in FIG. 8, the conversion surface portion 514 forms a surface that is oblique with respect to the direction connecting the safety valve 170 and the electrode terminal (X-axis direction). Therefore, the conversion surface portion 514 can change the direction of the exhaust while absorbing the impact of the exhaust from the safety valve 170. Further, since the exhaust gas whose flow direction has been converted by the conversion surface portion 514 is directed in the oblique direction, the exhaust gas collides with the inner surface of the exterior body 10 from the oblique direction, for example. Therefore, possibility that the exterior body 10 will be damaged by exhaust_gas | exhaustion is reduced more.

  Here, the bus bar frame 500 according to the present embodiment includes a plurality of discharge portions 512 and conversion surface portions 514. Specifically, as shown in FIG. 6, the bus bar frame 500 has eight discharge portions 512 and eight conversion surface portions 514 corresponding to the eight power storage elements 100 included in the power storage device 1.

  In this manner, since the bus bar frame 500 is provided with at least one discharge portion 512 corresponding to each of the plurality of power storage elements 100, for example, as shown in FIG. Is formed. That is, the exhaust from the safety valve 170 of the electricity storage element 100 can be efficiently released.

  In addition, since the bus bar frame 500 is provided with the conversion surface portion 514 corresponding to each of the plurality of power storage elements 100, the exhaust is efficiently exhausted while protecting the electrode terminals of each of the plurality of power storage elements 100 from the exhaust. It becomes possible to release.

  More specifically, each of the discharge portion 512 and the conversion surface portion 514 is provided one by one in the bus bar frame 500 corresponding to the two electrode terminals (the positive electrode terminal 120 and the negative electrode terminal 130) included in one power storage element 100. (See FIGS. 7 and 8).

  That is, the exhaust from the safety valve 170 of the power storage element 100 flows in the direction of the two electrode terminals and flows to the outside of the bus bar frame 500 from the two discharge parts 512. Thereby, the exhaust from the safety valve 170 of the electricity storage element 100 can be released more efficiently. Further, the two electrode terminals are protected from the heat of the exhaust by the conversion surface portions 514 corresponding to the two electrode terminals. Accordingly, the exhaust can be efficiently discharged while protecting the two electrode terminals from the exhaust.

  Further, in power storage device 1 according to the present embodiment, for example, as shown in FIG. 9, a plurality of power storage elements 100 are arranged in the first direction (Z-axis direction). In the plurality of power storage elements 100, the safety valve 170 and the electrode terminal are arranged side by side in a second direction (X-axis direction) that intersects the first direction (Z-axis direction). Furthermore, the distance La between the safety valve 170 and the discharge part 512 is shorter than the width Lb in the Z-axis direction of the row of the plurality of power storage elements 100. The distance La is the distance between the centers of the openings of the safety valve 170 and the discharge part 512 in the X-axis direction.

  That is, according to the power storage device 1 according to the present embodiment, compared with the conventional method in which exhaust is discharged by flowing exhaust from the safety valve of these power storage elements in the direction in which the plurality of power storage elements are arranged, the exhaust emission Efficiency is improved.

  More specifically, in the present embodiment, the exhaust from the safety valve 170 of each of the plurality of power storage elements 100 is discharged to the outside of the power storage unit 30 from one or more discharge portions 512 that are located at relatively close positions. . Therefore, for example, there is less stagnation or resistance in the exhaust flow path than when exhaust generated by a plurality of power storage elements is discharged all at once by a duct or the like extending in the direction in which the plurality of power storage elements are arranged.

  As a result, in power storage device 1 according to the present embodiment, exhaust from safety valve 170 of each power storage element 100 can be efficiently released.

  As a material of the bus bar frame 500 having the above configuration, for example, a resin is adopted in consideration of electrical insulation and ease of molding.

  Further, considering that the exhaust from the safety valve 170 directly collides, it is preferable to form the bus bar frame 500 with a resin having high heat resistance. For example, the bus bar frame 500 may be formed of a resin having higher heat resistance than the resin forming the exterior body 10.

  Further, for example, a heat resistant resin such as a thermosetting resin may be employed as the material of the bus bar frame 500. Thermosetting resins include phenolic resin, urea resin, melamine resin, unsaturated polyester resin, diallyl phthalate resin, epoxy resin, silicon resin, alkyd resin, polyimide, polyaminobismaleimide, casein resin, furan resin, urethane resin, etc. Illustrated.

  Note that in the case where the partition wall portion 511 is formed of a resin, the partition wall portion 511 can be manufactured by integral molding with the bus bar frame 500, which contributes to, for example, improving the production efficiency of the power storage device 1. In addition, for example, the weight of the partition wall portion 511 is suppressed as compared with the case where a metal is used as the base material of the partition wall portion 511, which contributes to, for example, weight reduction of the power storage device 1.

  Moreover, only the partition part 511 in the bus-bar frame 500 may be formed with heat resistant resins, such as a phenol resin.

  The partition wall 511 of the bus bar frame 500 may be formed of a material that may be deformed or melted by exhaust from the safety valve 170.

  Specifically, when it is assumed that the ejection of the exhaust from the safety valve 170 of the power storage element 100 continues for a predetermined period, the partition wall portion 511 is caused by heat or impact of the exhaust at least during the predetermined period. What is necessary is just to have heat resistance or intensity | strength of a grade which a hole is not formed.

  For example, the maximum temperature of the exhaust from the safety valve 170 of the energy storage device 100 is about 500 ° C., and the period during which the exhaust is ejected vigorously is about 1 minute (exceeding 1 minute reduces the exhaust ejection speed). Assume a case. In this case, the partition wall 511 only needs to have heat resistance or strength that does not have holes under the condition that the state in which the exhaust at 500 ° C. collides continues for one minute.

  That is, if the external members of the bus bar frame 500 such as the exterior body 10 can be protected from the exhaust from the safety valve 170 of one or more power storage elements 100, the bus bar frame 500 itself is deformed by the exhaust or It may be dissolved.

  Moreover, although there is no limitation in particular in the magnitude relationship about the thickness of the partition part 511, and the thickness of the exterior body 10, the partition part 511 is a location which has thickness more than the thickness (for example, thickness of the thickest part) of the exterior body 10. May be included. Thereby, it is possible to further suppress the influence of the high-temperature exhaust from the safety valve 170 on the exterior body 10.

  In the power storage unit 30 including the bus bar frame 500 having the above-described configuration, as described above, the exhaust from the safety valve 170 is outside the power storage unit 30 via one or more discharge parts 512 that are located relatively close to the safety valve 170. Will be released.

  That is, the exhaust from the safety valve 170 is quickly moved away from the plurality of power storage elements 100 included in the power storage unit 30. At this time, the exhaust from the safety valve 170 collides with at least the partition wall 511, whereby the heat of the exhaust is conducted to the partition wall 511, the temperature of the exhaust is lowered, and the impact of the exhaust is also reduced.

  The exhaust discharged to the outside of the power storage unit 30 is further mixed with a gas (for example, the atmosphere) existing outside the power storage unit 30 and inside the exterior body 10 to further reduce the temperature, The speed is also reduced.

  Thus, the exhaust gas mixed with the gas inside the exterior body 10 is discharged to the outside of the power storage device 1 from the exhaust pipe 13 (see FIG. 1) of the exterior body 10.

  In the power storage device 1 according to the present embodiment, the first exterior body 11 and the second exterior body 12 are joined to each other so as to seal the inside, for example, by a technique such as thermal welding.

  Therefore, for example, leakage of the exhaust discharged from the power storage element 100 to the outside of the exterior body 10 is suppressed. Moreover, when the exhaust pipe 13 is provided in the exterior body 10 as in the present embodiment, the exhaust discharged from the power storage element 100 leaks outside the exterior body 10 from other than the exhaust pipe 13. Is suppressed. That is, the exterior body 10 has airtightness, so that unintentional leakage of the exhaust discharged from the power storage element 100 to the outside of the exterior body 10 is suppressed.

  Therefore, the power storage device 1 does not require a structure in which, for example, the exhaust pipe connected to the safety valve 170 of the power storage element 100 is connected to the exhaust pipe 13 of the exterior body 10. Therefore, for example, even when a plurality of openings (discharge portions 512) are provided in the bus bar frame 500 as in the present embodiment, the exhaust discharged from each discharge portion 512 is processed in an intended manner. It can be performed (contained at a reduced temperature, or safely released to the outside of the outer package 10).

  For example, when the power storage device 1 is mounted on an automobile, the exhaust pipe 13 and the exhaust passage from the automobile engine may be connected by a heat-resistant hose. Thereby, the exhaust from the safety valve 170 of one or more power storage elements 100 provided in the power storage device 1 can be released to the outside of the vehicle.

  Thus, power storage device 1 according to the present embodiment can efficiently discharge the exhaust from safety valve 170 of power storage element 100.

  Here, in the power storage device 100 included in the power storage device 1, the electrode terminal and the safety valve 170 may be disposed on different surfaces of the power storage device 100. That is, the power storage device 1 may include a plurality of power storage elements 100 in which the electrode terminal and the safety valve 170 are not arranged on the same surface.

  Even in this case, the exhaust from each safety valve 170 is guided by guiding the exhaust from the safety valve 170 from each of the plurality of power storage elements 100 in a direction that intersects the arrangement direction (first direction) of the plurality of power storage elements 100. Can be efficiently released. That is, the power storage device 1 may be configured as follows.

  A plurality of power storage elements 100 each having a safety valve 170 arranged in a first direction, and a bus bar frame forming a flow path for guiding exhaust from each safety valve 170 of each of the plurality of power storage elements 100 in a direction intersecting the first direction. 500. Bus bar frame 500 connects partition 511 disposed at a position facing safety valve 170 of each of the plurality of power storage elements 100, a space on the plurality of power storage elements 100 side of bus bar frame 500, and an external space of bus bar frame 500. And at least one discharge portion 512 forming an opening. The distance between the safety valve 170 of each of the plurality of power storage elements 100 and the at least one discharge part 512 is shorter than the width in the first direction of the row of the plurality of power storage elements 100.

  According to this configuration, the path length for exhaust emission is shortened as compared with the conventional method of forming a flow path for exhaust emission from the safety valve of the energy storage elements in the direction in which the plurality of energy storage elements are arranged. be able to. Therefore, according to the power storage device 1 having the above configuration, exhaust emission efficiency can be improved.

  Even when the power storage device 1 includes a plurality of power storage elements 100 in which the electrode terminal and the safety valve 170 are not disposed on the same surface, the bus bar frame 500 has at least one corresponding to each of the plurality of power storage elements 100. You may have two opening (discharge part 512). Thereby, the discharge of the exhaust for each power storage element 100 is further promoted, and as a result, the exhaust of the exhaust as a whole of the power storage device 1 is made efficient.

  In addition, the bus bar frame 500 capable of producing the above-described effects can be attached to a plurality of power storage elements 100 (hereinafter, also referred to as “collection of power storage elements 100”) with a simple configuration, and each bus bar 32 is provided. Can be regulated.

  FIG. 10 is a third perspective view showing the configuration of the power storage unit 30 according to the embodiment. Specifically, FIG. 10 is an exploded perspective view when the power storage unit 30 in a state where the aggregate of the power storage elements 100 and the bus bar frame 500 are separated is viewed from obliquely below. Moreover, in FIG. 8, illustration of the clamping member 300 and the restraining member 400 is abbreviate | omitted.

  FIG. 11 is an exploded perspective view showing the positional relationship between the restricting portion of the bus bar frame 500 and the engaging portion of the spacer 200. Note that FIG. 11 shows a state before the bus bar frame 500 is engaged with the spacer 200, and illustration of the power storage element 100 is omitted. FIG. 11 shows a partially enlarged view of the bus bar frame 500 cut along a plane parallel to the XY plane in order to clearly show the first restricting portion 534 and the second restricting portion 536.

  As shown in FIGS. 10 and 11, the bus bar frame 500 engages with the first engagement portion 211 of the spacer 200 to move to the opposite side (the Y axis direction plus side) from the plurality of power storage elements 100. The first restricting portion 534 is regulated.

  Further, the bus bar frame 500 is engaged with the second engagement portion 212 of the spacer 200, whereby the second restriction portion that restricts the movement to the opposite side (the Y axis direction plus side) from the plurality of power storage elements 100. 536.

  Specifically, as shown in FIG. 10, for example, among the seven spacers 200 arranged in the Z-axis direction, the first engagement portion 211 of each of the first, fourth, and seventh spacers 200 from the end is engaged. A first restricting portion 534 is provided at a position where they are aligned.

  Each spacer 200 has a first engagement portion 211 on the back side (X-axis direction minus side) in FIG. That is, the bus bar frame 500 includes six first restricting portions 534 corresponding to a total of six first engaging portions 211 of the three spacers 200.

  In the present embodiment, the first restricting portion 534 is provided at the end of the bus bar frame 500 as a protruding piece having a hole, and the first engagement provided in a protruding shape from the side surface of the spacer 200 in the hole. When the part 211 is inserted, the first engaging part 211 is engaged.

  In this way, each of the one or more first engaging portions 211 included in the bus bar frame 500 is engaged with the first engaging portion 211, thereby restricting the movement of the bus bar frame 500 to the plus side in the Y-axis direction. The

  Note that the mode of engagement between the first restricting portion 534 and the first engaging portion 211 is not limited to the above mode. For example, the protrusion or claw of the first restricting portion 534 is inserted into the hole or recess of the first engaging portion 211 so that the first restricting portion 534 and the first engaging portion 211 are engaged. Also good.

  In addition, the bus bar frame 500 has one or more first engaging portions 211 to be engaged with one or more selected first engaging portions 211 of the first engaging portions 211 of each of the plurality of spacers 200. A restricting portion 534 may be provided. Therefore, for example, the number and positions of the first restricting units 534 can be determined in accordance with the structure of the power storage device 1 or the specifications to be satisfied by the power storage device 1.

  In the bus bar frame 500, the second restricting portion 536 is disposed at a position corresponding to the second engaging portion 212 provided on the surface of the spacer 200 on the bus bar frame 500 side, as shown in FIG.

  That is, the first restricting portion 534 and the second restricting portion 536 are arranged in the second direction (X-axis direction) intersecting the first direction (Z-axis direction) and arranged on the opposite sides with the bus bar 32 in between. ing.

  The second restricting portion 536 disposed at such a position with respect to the first restricting portion 534 engages with the second engaging portion 212, whereby the movement of the bus bar frame 500 to the Y axis direction plus side is prevented. Be regulated.

  In the present embodiment, as can be seen from FIG. 3 and FIG. 11, for example, the second restricting portion 536 includes the safety valves 170 and the electrode terminals (102) of the plurality of power storage elements 100 in the second direction (X-axis direction). Or 103). In other words, in the power storage device 1, the second restricting portion 536 and the second engaging portion 212 are disposed at positions that are unlikely to hinder the release of gas from the safety valve 170 of each power storage element 100.

  In the present embodiment, the second restricting portion 536 has a hole penetrating the bus bar frame 500 in the Y-axis direction, and the second restriction portion 536 is provided in the hole so as to protrude from the surface of the spacer 200 on the bus bar frame 500 side. The second engagement portion 212 is inserted to engage with the second engagement portion 212.

  The bus bar frame 500 has one or more second restricting portions 536 so as to engage with one or more selected second engaging portions 212 of the second engaging portions 212 of each of the plurality of spacers 200. May be provided. Therefore, for example, the number and positions of the second restricting portions 536 can be determined according to the structure of the power storage device 1 or the specifications to be satisfied by the power storage device 1.

  Further, the mode of engagement between the second restricting portion 536 and the second engaging portion 212 is not limited to the above mode. For example, when the protrusion or claw of the second restricting portion 536 is inserted into the hole or recess of the second engaging portion 212, the second restricting portion 536 and the second engaging portion 212 are engaged. Also good.

  When the bus bar frame 500 having the above configuration is attached to the assembly of the power storage elements 100, a state in which a part of the protrusion 552a standing on the support portion 552 is inserted into the opening formed in the bus bar 32 is maintained. Is done. Thereby, the bus bar 32 is positioned with respect to the electrode terminals to be joined. As a result, the bus bar 32 and the electrode terminals are joined with high accuracy.

  Here, the bus bar frame 500 according to the present embodiment includes a wiring accommodating portion 537 in which various wirings (signal lines, power lines, etc.) are accommodated, as shown in FIG. Specifically, the bus bar frame 500 includes a passage portion formed in a concave shape in the peripheral portion and a lid portion 539 for closing an opening above the passage portion. That is, the internal space of the passage portion functions as the wiring housing portion 537.

  The lid 539 is attached to the main body of the bus bar frame 500 so as to be rotatable by a hinge 538.

  When the bus bar frame 500 having such a configuration is attached to the assembly of the power storage elements 100, for example, a wiring such as a lead wire connecting the sensor disposed in each power storage element 100 and the electric device 40 is a wiring housing portion 537. The lid 539 is closed.

  Thereby, it is possible to prevent a large number of wires around the assembly of the power storage elements 100 from interfering with the work of attaching the bus bar frame 500, which contributes to the improvement of the production efficiency of the power storage device 1.

  In addition, after the bus bar frame 500 is attached to the aggregate of the power storage elements 100, welding work is performed on each bus bar 32 whose position is regulated by the bus bar frame 500.

  At the time of this welding operation, the various wirings are accommodated in the wiring accommodating portion 537 closed by the lid portion 539, so that the various wirings are protected from, for example, sparks generated by welding.

  As described above, the bus bar frame 500 according to the present embodiment is provided on the side opposite to the plurality of power storage elements 100 (plus side in the Y-axis direction) by another member that is a member other than the bus bar frame 500 provided in the power storage device 1. There is a restricting part that is restricted from moving to. In other words, the bus bar frame 500 has a restricting portion that restricts movement to the opposite side of the plurality of power storage elements 100 with the bus bar 32 as a reference.

  In the present embodiment, the restricting portion is realized by each of the first restricting portion 534 and the second restricting portion 536, or a combination thereof. In addition, the other member is one or more spacers 200 in the present embodiment. In addition, as said other member, the exterior body 10, the electrical storage element 100, etc. are illustrated. That is, the movement of the bus bar frame 500 may be restricted by the exterior body 10 or the power storage element 100.

  Here, the bus bar frame 500 may include a pressing portion as an element for positioning the bus bar 32 in addition to or in place of the above-described protrusion 552a.

  FIG. 12 is a partial cross-sectional view showing a state where the bus bar frame 500 having the pressing portion 531 is attached to the assembly of the storage elements 100.

  12 illustrates a cross section of the bus bar frame 500 and the spacer 200 around the central bus bar 32 of the three bus bars 32 on the front side (X-axis direction plus side) in FIG. In FIG. 12, the bus bar 32 and each power storage element 100 are not a cross-sectional view but a side view as seen from the X axis direction plus side.

  The bus bar frame 500 according to the present embodiment is made of an insulating resin or the like. In addition to the formation of the exhaust flow path described above, the bus bar 32 and other members are insulated from each other, various wirings, and the like. It is a member that can protect and restrict the position of each bus bar 32.

  As illustrated in FIG. 12, the bus bar frame 500 may include a pressing portion 531 that contacts the bus bar 32 from the side opposite to the plurality of power storage elements 100. In FIG. 12, the holding portions 531 are arranged so that at least two holding portions 531 come into contact with each of the five bus bars 32 arranged on the bus bar frame 500.

  When each of the plurality of bus bars 32 is disposed on the bus bar frame 500, the side wall portion 533 of the bus bar frame 500 isolates the bus bars 32 from other metal members such as the bus bars 32 in a direction parallel to the XZ plane. Thereby, for example, when a strong impact is applied to power storage device 1, occurrence of a short circuit due to contact between bus bars 32 is suppressed.

  For example, as shown in FIG. 12A, the bus bar 32 is disposed on the bus bar frame 500 having such a configuration so as to be supported by one or more support portions 552. At this time, the bus bar 32 is disposed while elastically deforming the plurality of pressing portions 531 that finally come into contact with the bus bar 32 from above (from the Y axis direction plus side). Alternatively, by tilting the bus bar 32, the bus bar 32 is supported by one or more support portions 552 beyond the plurality of pressing portions 531.

  The bus bar frame 500 in which the plurality of bus bars 32 are arranged in this manner is arranged on the electrode terminal side of the assembly of the storage elements 100.

  As a result, as shown in FIG. 12B, the bus bar 32 contacts the electrode terminals of each of the at least two power storage elements 100, and the pressing portion 531 is opposite to the plurality of power storage elements 100 (Y It comes into contact with the axially positive side.

  Further, the bus bar 32 is in a state in which a protruding portion 552a erected on the support portion 552 is inserted.

  In this state, the bus bar frame 500 is restricted from moving to the side opposite to the plurality of power storage elements 100 (the Y axis direction plus side) as described above. As a result, the bus bar 32 is positioned by engagement with the protruding portion 552a and pressing by the pressing portion 531. In this state, the bus bar 32 is accurately joined to each electrode terminal by welding such as laser welding.

  Here, since the 1st control part 534 and the 2nd control part 536 are arrange | positioned on the opposite side on both sides of the bus bar 32, the bus bar 32 is pressed with the one or more pressing parts 531 with sufficient balance.

  As described above, each of the protruding portion 552a and the pressing portion 531 functions as a positioning portion that positions the bus bar 32 with respect to each electrode terminal of at least two power storage elements 100 of the plurality of power storage elements 100.

  Note that the bus bar frame 500 may be provided with only one of the protruding portion 552a and the pressing portion 531 as a positioning portion for positioning the bus bar 32.

  As described above, since the bus bar frame 500 according to the present embodiment can position the bus bar 32 with a simple configuration, for example, when the power storage device 1 is manufactured, the bus bar frame 500 is connected to the electrode terminal of the power storage element 100. 32 can be easily joined.

  In other words, in the present embodiment, the bus bar frame 500, which is a member structurally related to the bus bar 32, has a function of efficiently discharging the exhaust from the safety valve 170 of the power storage element 100. Thereby, for example, effects such as reduction in the number of parts of the power storage device 1 or improvement in production efficiency can be obtained.

  The power storage device 1 may include a bus bar frame 500 having a configuration different from the bus bar frame 500 illustrated in FIGS. 7 and 8, for example. Therefore, in the following, a modified example related to the bus bar frame 500 according to the embodiment will be described focusing on the difference from the above embodiment.

(Modification 1 of embodiment)
FIG. 13 is a cross-sectional view illustrating a schematic configuration of a bus bar frame 501 according to the first modification of the embodiment.

  13 shows a partial cross section of the bus bar frame 501 when the bus bar frame 501 is cut in the vicinity of the center in the thickness direction (Z-axis direction) of the power storage element 100, as in FIG. Moreover, the electrical storage element 100 is represented by a side view, and the safety valve 170 is schematically illustrated by a rectangular region with dots. These matters also apply to FIG. 14 described later.

  A bus bar frame 501 shown in FIG. 13 is an example of a cover member. The bus bar frame 501 includes a partition wall portion 511 disposed at a position facing the safety valve 170 of the power storage element 100, and flows the exhaust from the safety valve 170 toward the electrode terminal. Form a road.

  The bus bar frame 501 according to the present modification is characterized in that it includes a protection member 511b disposed in the partition wall portion 511.

  The protection member 511b is a heat insulating member or a heat resistant member, and is a member that improves the resistance of the bus bar frame 501 to exhaust from the safety valve 170.

  That is, instead of increasing the wall thickness of the partition wall portion 511 as in the thick wall portion 511a (see FIG. 8), a member separate from the bus bar frame 501 is disposed in the partition wall portion 511, thereby separating the partition wall portion 511. The resistance to the heat or impact of the exhaust from the safety valve 170 may be improved.

  The material of the protective member 511b is not limited to a specific material, and various materials can be used. Examples of the material of the protective member 511b include heat-resistant resins such as the above-described phenol resins, damma materials, glass wool, and the like.

(Modification 2 of embodiment)
FIG. 14 is a cross-sectional view illustrating a schematic configuration of a bus bar frame 502 according to the second modification of the embodiment.

  A bus bar frame 502 shown in FIG. 14 is an example of a cover member. The bus bar frame 502 includes a partition wall portion 511 disposed at a position facing the safety valve 170 of the power storage device 100, and flows the exhaust from the safety valve 170 toward the electrode terminal. Form a road.

  The bus bar frame 502 according to the present modification is a tapered portion 511c that protrudes in the direction of the safety valve 170, and forms a slope that moves away from the storage element 100 as it approaches each of the two electrode terminals (the positive electrode terminal 120 and the negative electrode terminal 130). It is characterized by having a tapered portion 511c.

  That is, the taper portion 511c forms a slope as shown in FIG. 14, so that the exhaust flow from the safety valve 170 can be more reliably dispersed in the directions of the positive electrode terminal 120 and the negative electrode terminal 130, respectively. .

  Further, since the tapered portion 511c increases the thickness of the partition wall portion 511 similarly to the thick portion 511a (see FIG. 8), it improves the resistance to heat or impact of the exhaust from the safety valve 170 of the partition wall portion 511. You can also.

  In addition, it is not essential that the taper part 511c is thick. For example, the taper part 511c may be formed by denting the area | region equivalent to the taper part 511c of the bus-bar frame 502 in FIG. In this case, the thickness of the tapered portion 511c may be the same as the thickness other than the tapered portion 511c.

  The tapered portion 511c may be provided corresponding to only one of the two electrode terminals (the positive terminal 120 and the negative terminal 130). In other words, the tapered portion 511c only needs to form a slope that moves away from the power storage element 100 as it approaches the electrode terminal (the positive electrode terminal 120 or the negative electrode terminal 130). Thereby, the exhaust from the safety valve 170 can be guided in at least one direction of the positive electrode terminal 120 and the negative electrode terminal 130, and thereby the exhaust emission can be made efficient.

(Other embodiments)
Heretofore, the power storage device according to the present invention has been described based on the embodiment and the modifications thereof. However, the present invention is not limited to the above-described embodiment and its modifications. As long as it does not deviate from the gist of the present invention, various modifications conceived by those skilled in the art may be applied to the above-described embodiment or its modifications, or a form constructed by combining a plurality of the constituent elements described above. Included within the scope of the invention.

  For example, a member separate from the bus bar frame 500 that is structurally involved in the bus bar 32 may be provided in the power storage device 1 as a cover member that forms a flow path for exhaust from the safety valve 170 of the power storage element 100.

  For example, the bus bar frame 500 having a positioning portion such as the protruding portion 552a or the pressing portion 531 so as to cover a region excluding a region (central region) between the positive electrode terminal 120 and the negative electrode terminal 130 of each of the plurality of power storage elements 100. The bus bar frame 500 is formed. Further, a cover member is formed so as to cover the central region of the plurality of power storage elements 100. In this case, the bus bar frame 500 may be formed of a resin that is easily elastically deformed, and the cover member having the partition wall portion 511 may be formed of a resin that is hardly elastically deformed and has high heat resistance, such as a phenol resin.

  Moreover, the angle with respect to the X-axis direction of the surface formed by the conversion surface part 514 is not limited to the angle shown, for example in FIG. For example, the conversion surface portion 514 may form a surface orthogonal to the X-axis direction (a surface parallel to the Y-axis direction). Further, the surface formed by the conversion surface portion 514 is not necessarily a flat surface, and may be a curved surface.

  Further, the position of the discharge unit 512 and the shape of the opening of the discharge unit 512 are not limited to the positions and shapes shown in FIGS. For example, the discharge part 512 may be provided so as to form an opening above the conversion surface part 514 (the Y axis direction plus side) in FIG. That is, the exhaust from the safety valve 170 of the electricity storage element 100 may be discharged to the outside of the bus bar frame 500 from the opening of the discharge portion 512 after the flow direction is converted by the conversion surface portion 514.

  Further, for example, ribs (wall portions) that guide the exhaust from the safety valve 170 of the power storage element 100 toward the electrode terminals of the power storage element 100 may be provided on the partition wall 511 of the bus bar frame 500. That is, ribs (wall portions) for forming an exhaust passage may be provided in the partition wall 511.

  Further, for example, the protection member 511b according to the first modification of the embodiment may be formed in a protruding shape like the tapered portion 511c according to the second modification of the embodiment. As a result, the protective member 511b can be provided with a function of more reliably dispersing the exhaust flow in the respective directions of the positive electrode terminal 120 and the negative electrode terminal 130.

  The present invention can be applied to a power storage device including a plurality of power storage elements.

DESCRIPTION OF SYMBOLS 1 Power storage device 10 Exterior body 11 1st exterior body 12 2nd exterior body 13 Exhaust pipe 21 Positive electrode external terminal 22 Negative electrode external terminal 30 Power storage unit 32 Bus bar 40 Electrical equipment 100 Power storage element 110 Container 120 Positive electrode terminal 130 Negative electrode terminal 140 Electrode body 150 Positive electrode current collector 160 Negative electrode current collector 170 Safety valve 200 Spacer 211 First engagement portion 212 Second engagement portion 300, 310, 320 Holding member 400, 410, 420, 430, 440 Restraining member 411 Through hole 500, 501, 502 Busbar frame 511 Bulkhead part 511a Thick part 511b Protective member 511c Taper part 512 Discharge part 514 Conversion surface part 531 Press part 533 Side wall part 534 First restriction part 536 Second restriction part 537 Wiring accommodating part 538 Hinge 539 Cover part 552 Support part 552a protrusion Part

Claims (11)

A storage element having an electrode terminal and a safety valve;
A partition member disposed at a position facing the safety valve, and a cover member that forms a flow path that guides exhaust gas from the safety valve toward the electrode terminal,
The cover member is further provided with an opening formed in the direction of the electrode terminal as viewed from the safety valve to connect the space on the power storage element side of the cover member and the external space of the cover member. A power storage device. The power storage device according to claim 1, wherein the discharge portion is disposed between a region of the partition wall portion facing the safety valve and the electrode terminal. The cover member further includes a conversion surface portion that is disposed between the safety valve and the electrode terminal and forms a surface that converts the flow of the exhaust gas guided in the direction of the electrode terminal in a direction away from the power storage element. The power storage device according to claim 1 or 2. The electrode terminal and the safety valve are disposed on the same surface in the electricity storage element,
The power storage device according to claim 3, wherein a maximum value of a height of the conversion surface portion from the surface on which the electrode terminal is disposed is larger than a height from the surface of the electrode terminal. The power storage device includes a plurality of power storage elements,
The power storage device according to any one of claims 1 to 4, wherein the cover member includes at least one discharge unit corresponding to each of the plurality of power storage elements. The plurality of power storage elements are arranged in a first direction,
In each of the plurality of power storage elements, the safety valve and the electrode terminal are arranged side by side in a second direction intersecting the first direction, and the distance between the safety valve and the discharge portion is a plurality of The power storage device according to claim 5, wherein the power storage device has a width shorter than the width in the first direction. The said partition part is a taper part which protrudes in the direction of the said safety valve, Comprising: It has a taper part which forms the slope which goes away from the said electrical storage element as it approaches the said electrode terminal. Power storage device. Furthermore, the electrical storage apparatus of any one of Claims 1-7 provided with the exterior body formed with resin which accommodates the said electrical storage element and the said cover member. The power storage device according to claim 8, wherein the exterior body includes a first exterior body and a second exterior body that are joined to each other so as to seal the inside. The power storage device according to claim 8 or 9, wherein the cover member is disposed in a state where a gap is formed at least at a part between the cover member and the inner surface of the exterior body. The power storage device according to any one of claims 1 to 10, wherein the partition wall portion has a thicker portion that is thicker than other portions of the cover member.

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