JP7078075B2 - Power storage device - Google Patents

Description

The present invention relates to a power storage device including a power storage element and an electric device.

Conventionally, a power storage device having a structure including a power storage element and an electric device such as a substrate is widely known. In such a power storage device, conventionally, a configuration has been proposed in which a flow path for guiding the exhaust from the power storage element to the outside of the power storage device is formed to reduce the influence of the heat of the exhaust on the electric device (board). (See, for example, Patent Document 1).

JP-A-2015-195150

In the above-mentioned conventional power storage device, the heat from the power storage element is guided to the outside of the power storage device to reduce the influence of the heat on the electric equipment. However, it is desired to further reduce the influence of the heat on the electric equipment. There is a request.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a power storage device capable of reducing the influence of heat from a power storage element on an electric device.

In order to achieve the above object, the power storage device according to one aspect of the present invention is between a power storage element, an electric device having at least one of a substrate, a relay and a fuse, and the power storage element and the electric device. The first wall portion is arranged adjacent to the power storage element, and the first wall portion projects from the first wall portion toward the electric device and is arranged in an annular shape along the first wall portion. The first wall portion side is provided with a second wall portion that forms an opening on the electric device side without forming an opening, and the electric device is arranged so as to close the opening. A space is formed between the electric device and the first wall portion, the electric device covers the entire opening when viewed from the arrangement direction of the electric device and the first wall portion, and the electric device and the second wall portion are formed. A gap is formed between the two.

According to this, in the power storage device, the first wall portion is arranged between the power storage element and the electric device, and the electric device closes the opening formed by the second wall portion protruding from the first wall portion. It is arranged to form a space between it and the first wall. As a result, even if the air in the space is heated by the heat from the power storage element, the electric equipment is arranged so as to close the opening of the space, so that the heated air in the space goes out of the space. It is possible to suppress the outflow. As a result, it is possible to suppress the heated air from wrapping around to the front side of the electric device, so that the influence of the heat from the power storage element on the electric device can be reduced.

Further, the distance between the electric device and the second wall portion may be smaller than the distance between the electric device and the first wall portion.

According to this, since the electric device is arranged so that the distance between the electric device and the second wall portion is smaller than the distance between the electric device and the second wall portion, the electric device and the second wall portion are separated from each other. In the meantime, it is possible to suppress the outflow of heated air. Therefore, it is possible to suppress the heated air from wrapping around to the front side of the electric device, and it is possible to reduce the influence of the heat from the power storage element on the electric device.

Further, a support portion fixed to the first wall portion and supporting the electric device may be provided.

According to this, since the support portion that supports the electric device is fixed to the first wall portion, the first wall portion has a function of reducing the influence of heat from the power storage element on the electric device. It has two functions, one is to support electrical equipment.

Further, the second wall portion may have a contact portion that abuts on the surface of the electric device on the first wall portion side.

According to this, since the second wall portion has a contact portion that abuts on the surface of the electric device on the first wall portion side, the contact portion is formed from between the electric device and the second wall portion. , It is possible to suppress the outflow of heated air. Therefore, it is possible to suppress the heated air from wrapping around to the front side of the electric device, and it is possible to reduce the influence of the heat from the power storage element on the electric device.

Further, the contact portion may have an elastic member that comes into contact with the electric device.

According to this, since the elastic member that comes into contact with the electric device is provided in the contact portion, the electric device and the second wall portion can be brought into close contact with each other, so that the electric device and the second wall portion can be brought into close contact with each other. In the meantime, the outflow of heated air can be further suppressed.

Further, the contact portion may be arranged between two support portions that support the electric device.

According to this, since the abutting portion is arranged between the two supporting portions that support the electric device, by fixing the electric device with the two supporting portions, the electric device and the second support portion are placed in the abutting portion. The two walls can be easily brought into close contact with each other. Therefore, it is possible to suppress the outflow of heated air from between the electric device and the second wall portion.

Further, the contact portion may be arranged in an annular shape along the outer circumference of the electric device.

According to this, since the contact portion is arranged in an annular shape along the outer circumference of the electric device, the heated air flows out from between the electric device and the second wall portion on the outer circumference of the electric device. Can be suppressed.

It should be noted that the present invention can be realized not only as a power storage device but also as a structure for reducing the thermal influence on the electric device (configuration of the first wall portion and the second wall portion with respect to the electric device) included in the power storage device. be able to.

According to the power storage device of the present invention, it is possible to reduce the influence of heat from the power storage element on the electric device.

It is a perspective view which shows the appearance of the power storage device which concerns on embodiment. It is an exploded perspective view which shows each component in the case of disassembling the power storage device which concerns on embodiment. It is a perspective view which shows the structure of the holding member which concerns on embodiment. It is a perspective view which shows the structure and the positional relationship of the holding member, the substrate and the cover member which concerns on embodiment. It is a perspective view which shows the structure in the case of assembling the holding member, the substrate and the cover member which concerns on embodiment. It is sectional drawing which shows the structure in the state which the holding member, the substrate and the cover member which concerns on embodiment are assembled. It is sectional drawing which shows the structure in the state which the holding member, the substrate and the cover member which concerns on the modification of embodiment are assembled.

Hereinafter, a power storage device according to an embodiment of the present invention and a modification thereof will be described with reference to the drawings. The embodiments and modifications thereof described below are all comprehensive or specific examples. Numerical values, shapes, materials, components, arrangement positions of components, connection forms, and the like shown in the following embodiments and modifications thereof are examples, and are not intended to limit the present invention. Further, among the components in the following embodiments and modifications thereof, the components not described in the independent claims indicating the highest level concept are described as arbitrary components. Further, in each figure, the dimensions and the like are not exactly shown.

Further, in the following description and drawings, the arrangement direction of the power storage elements, the opposite direction of the long side surface of the container of the power storage elements, or the thickness direction of the container is defined as the X-axis direction. Further, the arrangement direction of the electrode terminals in one power storage element or the facing direction of the short side surface of the container of the power storage element is defined as the Y-axis direction. Further, the alignment direction between the exterior body body of the power storage device and the lid, the arrangement direction between the container body and the lid of the power storage element, or the vertical direction is defined as the Z-axis direction. These X-axis directions, Y-axis directions, and Z-axis directions intersect each other (orthogonally in the present embodiment). Depending on the usage mode, the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described below as the vertical direction. Further, in the following description, for example, the plus side in the X-axis direction indicates the arrow direction side of the X-axis, and the minus side in the X-axis direction indicates the side opposite to the plus side in the X-axis direction. The same applies to the Y-axis direction and the Z-axis direction.

(Embodiment)
First, with reference to FIGS. 1 and 2, a general description of the power storage device 1 according to the present embodiment will be given. FIG. 1 is a perspective view showing the appearance of the power storage device 1 according to the present embodiment. FIG. 2 is an exploded perspective view showing each component when the power storage device 1 according to the present embodiment is disassembled.

The power storage device 1 is a device capable of charging electricity from the outside and discharging electricity to the outside. For example, the power storage device 1 is a battery module used for power storage, power supply, and the like. Specifically, the power storage device 1 includes, for example, an electric vehicle (EV), a hybrid electric vehicle (HEV), a vehicle such as a plug-in hybrid electric vehicle (PHEV), a motorcycle, a watercraft, a snowmobile, an agricultural machine, and construction. It is used as a battery for driving a moving body such as a machine or for starting an engine.

Here, as shown in FIGS. 1 and 2, the power storage device 1 includes an exterior body 10 composed of a first exterior body 11 and a second exterior body 12, and a plurality of power storage elements 20 housed inside the exterior body 10. , A plurality of bus bars 30, 70, a holding member 40, a substrate 50, and a cover member 60.

The exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage device 1. That is, the exterior body 10 is arranged outside the plurality of power storage elements 20, the bus bars 30, 70, the holding member 40, the substrate 50, the cover member 60, etc., and these power storage elements 20 and the like are arranged at predetermined positions and impacted. Protect from such things. Further, the exterior body 10 is made of an insulating material such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polybutylene terephthalate (PBT), or ABS resin. As a result, the exterior body 10 prevents the power storage element 20 and the like from coming into contact with an external metal member or the like.

Here, the exterior body 10 has a first exterior body 11 that constitutes the lid (outer lid) 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 member that closes the opening of the second exterior body 12, and is provided with a positive electrode external terminal 13 and a negative electrode external terminal 14. The power storage device 1 charges electricity from the outside and discharges electricity to the outside through the positive electrode external terminal 13 and the negative electrode external terminal 14. Further, the second exterior body 12 is a bottomed rectangular tubular housing having an opening formed therein.

The power storage element 20 is a secondary battery (single battery) capable of charging electricity and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. .. The power storage element 20 has a flat rectangular parallelepiped shape (square shape), and in the present embodiment, 12 power storage elements 20 are arranged in the X-axis direction. The shape of the power storage element 20 and the number of power storage elements 20 arranged are not limited. Further, the power storage element 20 is not limited to the non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery, may be a capacitor, and may be charged by the user. It may be a primary battery that can use the stored electricity without using the battery.

Here, the power storage element 20 includes a metal container 21, and a metal electrode terminal (positive electrode terminal 22 and negative electrode terminal 23) and a gas discharge valve 24 are provided on the lid portion of the container 21. .. The gas discharge valve 24 is a safety valve that discharges the gas and releases the pressure when gas is generated inside the container 21 and the pressure rises. Further, an electrode body (also referred to as a power storage element or a power generation element), a current collector (positive electrode current collector and negative electrode current collector) and the like are arranged inside the container 21, and an electrolytic solution (non-aqueous electrolyte) and the like are arranged. Although it is enclosed, detailed description will be omitted.

The bus bar 30 is a rectangular plate-shaped member arranged on the plurality of power storage elements 20 and electrically connecting the electrode terminals of the plurality of power storage elements 20 to each other. Further, the bus bar 70 is a rectangular plate-shaped member arranged on the holding member 40 and electrically connecting the bus bar 30, the positive electrode external terminal 13 and the negative electrode external terminal 14. The bus bars 30 and 70 are made of a conductive member made of metal such as copper, a copper alloy, aluminum, and an aluminum alloy.

In the present embodiment, the bus bar 30 connects three power storage elements 20 in parallel to form four sets of power storage elements, and connects the four sets of power storage elements in series. Further, the bus bar 70 connects the positive electrode terminals 22 of the three power storage elements 20 in the power storage element group arranged on the positive electrode external terminal 13 side (plus side in the X-axis direction in FIG. 2) and the positive electrode external terminal 13. .. Further, the bus bar 70 connects the negative electrode terminals 23 of the three power storage elements 20 in the power storage element group arranged on the negative electrode external terminal 14 side (minus side in the X-axis direction in FIG. 2) and the negative electrode external terminal 14. ..

The substrate 50 is a control substrate that is placed on the holding member 40 and fixed to the holding member 40. The substrate 50 is connected to a plurality of power storage elements 20 by wiring or the like, and acquires, monitors, and controls the states of the plurality of power storage elements 20. Specifically, the substrate 50 is provided with a control circuit (not shown), and can acquire various information such as a charge state, a discharge state, a voltage value, a current value, and a temperature of a plurality of power storage elements 20, and can be used as a relay. Controls on / off and communicates with other devices. The substrate 50 is an example of an electric device. A detailed description of the configuration of the substrate 50 will be described later.

The holding member 40 holds the substrate 50 and the bus bar 70, other electrical components such as relays, wirings, etc. (not shown), insulates the substrate 50 and the bus bar 70 and the like from other members, and the substrate. It is an electrical component tray that can regulate the positions of 50, bus bar 70, and the like. Further, since the holding member 40 is arranged inside the exterior body 10 below the first exterior body 11 (outer lid) and at a position that covers the power storage element 20 from above, the inner lid of the exterior body 10 is covered. It also has a function. The holding member 40 is formed of an insulating material such as PC, PP, PE, PPS, PBT or ABS resin.

Specifically, the holding member 40 is placed above the power storage element 20 and the bus bar 30 (plus side in the Z-axis direction), and is positioned with respect to the power storage element 20 and the bus bar 30. Further, the substrate 50, the cover member 60, the bus bar 70, and the like are placed and positioned on the holding member 40. Further, the first exterior body 11 is arranged and positioned on the holding member 40. As a result, the substrate 50 is positioned and connected to the wiring and the like, and the bus bar 70 is positioned and connected to the bus bar 30 and the positive electrode external terminal 13 and the negative electrode external terminal 14. A detailed description of the configuration of the holding member 40 will be described later.

The cover member 60 is a member that is arranged so as to cover the substrate 50 mounted on the holding member 40 and protects the substrate 50. Specifically, the cover member 60 is arranged on the holding member 40 so as to cover the periphery and the upper side of the substrate 50, and is attached to the holding member 40. The cover member 60 is made of an insulating material such as PC, PP, PE, PPS, PBT or ABS resin. A detailed description of the configuration of the cover member 60 will be described later.

Next, the configuration of the holding member 40 will be described in detail. FIG. 3 is a perspective view showing the configuration of the holding member 40 according to the present embodiment.

As shown in the figure, the holding member 40 includes a holding member main body 41, a holding member wall portion 42, a substrate support portion 43, a substrate positioning portion 44, and a cover member support portion 45. In the present embodiment, the holding member 40 is an integrally molded product in which the holding member main body 41, the holding member wall portion 42, the substrate support portion 43, the substrate positioning portion 44, and the cover member support portion 45 are integrally formed. It should be noted that any of these parts may be formed as a separate body.

The holding member main body 41 is a rectangular and flat plate-shaped portion as a whole constituting the main body of the holding member 40. Here, the holding member main body 41 has a first wall portion 41a at a central position. The first wall portion 41a is a rectangular and flat plate-shaped portion arranged between the power storage element 20 and the substrate 50. That is, the first wall portion 41a is a portion arranged at a position corresponding to the substrate 50 and having a shape corresponding to the substrate 50 in the top view (viewed from the Z-axis direction), and is a portion having a shape corresponding to the substrate 50 and the back surface (minus side in the Z-axis direction). The surface) faces the plurality of power storage elements 20, and the surface (the surface on the plus side in the Z-axis direction) faces the substrate 50.

The holding member wall portion 42 is a wall protruding upward (plus side in the Z-axis direction) from the upper surface of the holding member main body 41. Specifically, the holding member wall portion 42 is a rectangular and annular portion in a top view protruding upward from the four sides of the outer periphery of the first wall portion 41a, and is arranged so as to surround the outer periphery of the substrate 50. .. Further, the holding member wall portion 42 has a stepped portion 42a. The step portion 42a is a step-like (step-like) portion protruding inward from the outer peripheral portion of the holding member wall portion 42, and is arranged in an annular shape over the entire inner circumference of the holding member wall portion 42. ing. That is, the step portion 42a is a portion arranged at a position one step lower on the inner circumference of the holding member wall portion 42.

Here, the holding member wall portion 42 has a shape in which a part of the outer peripheral portion is chipped, and the cover member wall portion 62 of the cover member 60, which will be described later, is arranged around the chipped portion. That is, the holding member wall portion 42, together with the cover member wall portion 62, constitutes an annular wall portion (hereinafter referred to as a second wall portion) protruding from the first wall portion 41a toward the substrate 50. As described above, the second wall portion is arranged in an annular shape along the first wall portion 41a to form a rectangular opening 42b.

The substrate support portion 43 is a portion fixed to the first wall portion 41a and supports the substrate 50. Specifically, four substrate support portions 43 are arranged at the four corners of the first wall portion 41a, and through holes are formed in each of the substrate support portions 43. Further, the upper surface of the substrate support portion 43 is arranged at a position higher than the upper surface of the step portion 42a, and the substrate 50 is placed and fixed on the upper surface of the substrate support portion 43. A detailed description of the configuration in which the substrate 50 is fixed to the substrate support portion 43 will be described later.

The substrate positioning portion 44 is fixed to the first wall portion 41a and is a protrusion-shaped portion for positioning the substrate 50. Specifically, the substrate positioning portion 44 is a substantially cylindrical protrusion arranged at both ends in the X-axis direction on the negative side in the Y-axis direction of the first wall portion 41a, and is inserted into a through hole 51b of the substrate 50 described later. To position the substrate 50.

The cover member support portion 45 is arranged outside the first wall portion 41a and is a portion that supports and fixes the cover member 60. Specifically, four cover member support portions 45 are arranged on both outer sides in the X-axis direction and both sides in the Y-axis direction of the first wall portion 41a, and through holes are formed in each cover member support portion 45. Has been done. The cover member 60 is placed and fixed on the upper surface of the cover member support portion 45. A detailed description of the configuration in which the cover member 60 is fixed to the cover member support portion 45 will be described later.

Next, the configuration of the substrate 50 and the cover member 60, and the configuration in which the holding member 40, the substrate 50, and the cover member 60 are assembled (combined) will be described in detail. FIG. 4 is a perspective view showing the configuration and positional relationship of the holding member 40, the substrate 50, and the cover member 60 according to the present embodiment. Further, FIG. 5 is a perspective view showing a configuration when the holding member 40, the substrate 50 and the cover member 60 according to the present embodiment are assembled. Note that (a) in the figure shows the configuration when the substrate 50 is assembled to the holding member 40, and (b) in the figure shows the configuration when the cover member 60 is assembled to the configuration (a) in the figure. The configuration is shown.

First, as shown in FIG. 4, the substrate 50 includes a substrate main body 51, which is a rectangular and flat plate-shaped mounting substrate on which electronic components 52 are mounted, and a connector 53 attached to the substrate main body 51. The connector 53 is a connector for communicating with the outside and connecting to a plurality of power storage elements 20 to acquire the state of the power storage elements 20, and is attached to the upper surface of the substrate main body 51 on the minus side in the Y-axis direction. Has been done.

Further, in the figure, it is shown that two electronic components 52 are mounted on the front side of the board body 51, but many electronic components are mounted on the front side of the board body 51. Although electronic components are mounted on the back side of the board body 51, many electronic components that are easily affected by heat are mounted on the front side.

Further, four through holes 51a are formed at positions corresponding to the board support portions 43 at the four corners of the board body 51, and two through holes 51b are formed at positions corresponding to the two board positioning portions 44. There is. The substrate 50 is positioned with respect to the holding member 40 by inserting the two substrate positioning portions 44 into the two through holes 51b. Then, a resin fixing member 81 is inserted into each of the four through holes 51a and each of the through holes of the four substrate support portions 43, and the fixing member 81 is caulked by heat, so that the substrate 50 is a holding member. It is fixed at 40.

As a result, the substrate 50 is arranged above the first wall portion 41a and inside the holding member wall portion 42, and the substrate 50 is assembled to the holding member 40 as shown in FIG. 5A. .. The method of fixing the substrate 50 to the holding member 40 is not limited to heat caulking, and may be any method such as screw tightening, a fitting structure, or fixing with an adhesive. However, by performing heat caulking, it is possible to improve the adhesion and airtightness between the portion of the through hole 51a of the substrate 50 and the substrate support portion 43.

Returning to FIG. 4, the cover member 60 includes a cover member main body 61, a cover member wall portion 62, and a cover member fixing portion 63. In the present embodiment, the cover member 60 is an integrally molded product in which the cover member main body 61, the cover member wall portion 62, and the cover member fixing portion 63 are integrally formed. It should be noted that any of these parts may be formed as a separate body.

The cover member main body 61 is a rectangular and flat plate-shaped portion as a whole constituting the main body of the cover member 60, and is arranged above the substrate 50 so as to cover the upper surface of the substrate 50.

The cover member wall portion 62 is a wall protruding downward (minus side in the Z-axis direction) from the periphery of the cover member main body 61. Specifically, the cover member wall portion 62 is a portion protruding downward from three sides (three sides of the four sides excluding one side on the minus side in the Y-axis direction) of the outer circumference of the cover member main body 61, and is a substrate. Arranged around 50.

As a result, as described above, the cover member wall portion 62, together with the holding member wall portion 42, constitutes an annular second wall portion that forms a rectangular opening 42b. That is, the second wall portion has a wall of only the holding member wall portion 42, a wall of only the cover member wall portion 62, and a double wall of the holding member wall portion 42 and the cover member wall portion 62, and is a substrate. It is arranged so as to surround the outer circumference of 50. With this configuration, the substrate 50 is arranged so as to close the opening 42b formed by the second wall portion.

The cover member fixing portion 63 is a rectangular and flat plate-shaped portion protruding outward from both ends in the Y-axis direction of the walls on both sides in the X-axis direction of the cover member wall portion 62, and is formed on the cover member support portion 45 of the holding member 40. It is fixed. Specifically, four cover member fixing portions 63 are arranged at the four corners of the cover member 60, and through holes are formed in each of the cover member fixing portions 63. Then, the resin fixing member 82 is inserted into each of the through holes of the four cover member fixing portions 63 and the through holes of the four cover member support portions 45, and the fixing member 82 is caulked by heat. The cover member 60 is fixed to the holding member 40.

As a result, the cover member wall portion 62 is arranged around the substrate 50, and the cover member 60 is assembled to the holding member 40 as shown in FIG. 5B. The method of fixing the cover member 60 to the holding member 40 is not limited to heat caulking, and may be any method such as screw tightening, a fitting structure, or fixing with an adhesive.

Next, the configuration in which the holding member 40, the substrate 50, and the cover member 60 are assembled will be described in detail. FIG. 6 is a cross-sectional view showing a configuration in a state where the holding member 40, the substrate 50, and the cover member 60 according to the present embodiment are assembled. Specifically, FIG. 6A is a cross section when the configuration shown in FIG. 5B is cut along a plane parallel to the XZ plane including the VIa-VIa line (a line passing through the fixing member 81). It is a figure which shows. Further, FIG. 6B is a diagram showing a cross section when the configuration shown in FIG. 5B is cut along a plane parallel to the XZ plane including a VIb-VIb line (a line passing through the fixing member 82). Is. Further, FIG. 6 (c) is a cross section when the configuration shown in FIG. 5 (b) is cut along a plane parallel to the XZ plane including the VIc-VIc line (a line passing through the center position in the Y-axis direction). It is a figure which shows. The power storage element 20 is also shown in FIGS. 6A to 6C.

As described above, the substrate 50 is arranged so as to close the opening 42b formed by the second wall portion, and as shown in FIGS. 6A to 6C, there is a space between the substrate 50 and the first wall portion 41a. Form S1. Here, the substrate 50 is arranged close to (near) the holding member wall portion 42 and the cover member wall portion 62 constituting the second wall portion. Specifically, the distance between the substrate 50 and the second wall portion is smaller than the distance between the substrate 50 and the first wall portion 41a.

That is, in FIG. 6A, both ends of the substrate 50 in the X-axis direction are arranged close to the holding member wall portions 42, and the substrate support portions 43 of the holding member 40 are arranged on both sides in the X-axis direction. The space S1 is formed by being arranged in contact with the space S1. The distance D1 between the substrate 50 and the holding member wall portion 42 is smaller than the distance D2 between the substrate 50 and the first wall portion 41a.

Further, in FIG. 6B, in the substrate 50, the end portion on the minus side in the X-axis direction is arranged close to the holding member wall portion 42, and the end portion on the plus side in the X-axis direction is the cover member wall. The space S1 is formed by being arranged close to the portion 62. Further, the substrate 50 is arranged close to the step portion 42a of the holding member wall portion 42 on both sides in the X-axis direction. The distance D3 between the substrate 50 and the holding member wall portion 42 and the distance D4 between the substrate 50 and the cover member wall portion 62 are from the distance D5 between the substrate 50 and the first wall portion 41a. Is also small.

Further, in FIG. 6C, in the substrate 50, the end portion on the minus side in the X-axis direction is arranged close to the cover member wall portion 62, and the end portion on the plus side in the X-axis direction is the holding member wall. The space S1 is formed by being arranged in close proximity to the portion 42. Further, the substrate 50 is arranged close to the step portion 42a of the holding member wall portion 42 on both sides in the X-axis direction. The distance D6 between the substrate 50 and the cover member wall portion 62 and the distance D7 between the substrate 50 and the holding member wall portion 42 are from the distance D8 between the substrate 50 and the first wall portion 41a. Is also small.

Here, FIG. 6C shows a cross-sectional view when the power storage element 20 is cut at the position of the gas discharge valve 24, and the distance D8 between the substrate 50 and the first wall portion 41a in this case is shown. Is smaller than the distances D2 and D5 between the substrate 50 and the first wall portion 41a in FIGS. 6A and 6B. That is, the distance between the substrate 50 and the first wall portion 41a is the smallest in the region corresponding to the position of the gas discharge valve 24 of the power storage element 20. The distance between the substrate 50 and the second wall portion is smaller than this minimum distance D8. Therefore, the distance between the substrate 50 and the second wall portion is smaller than the minimum distance between the substrate 50 and the first wall portion 41a.

In the present embodiment, the distance between the substrate 50 and the second wall portion is about 2 mm or less with respect to the substrate 50 having a width of about 5 to 10 cm. If the distance between the substrate 50 and the second wall portion is not constant and varies, the maximum distance between the substrate 50 and the second wall portion is the substrate 50 and the first wall portion 41a. It is preferably less than the minimum distance between. However, the present invention is not limited to this, and the average distance or the minimum distance between the substrate 50 and the second wall portion may be smaller than the minimum distance between the substrate 50 and the first wall portion 41a.

In FIGS. 6A to 6C, the distance between the substrate 50 and the second wall portion is smaller than the distance between the substrate 50 and the first wall portion 41a in the X-axis direction. However, the same applies to the Y-axis direction. That is, the distance between the substrate 50 and the second wall portion is smaller than the distance between the substrate 50 and the first wall portion 41a on the entire circumference of the substrate 50. When neither the outer peripheral portion of the holding member wall portion 42 nor the cover member wall portion 62 is arranged on the side of the substrate 50, the distance between the substrate 50 and the step portion 42a is the distance between the substrate 50 and the second wall. It is the distance between the parts.

Further, as shown in FIGS. 6A and 6C, a space S2 is formed between the power storage element 20 and the first wall portion 41a. Here, as shown in FIG. 6C, in the space S2, in the region corresponding to the position of the gas discharge valve 24 of the power storage element 20, the distance D9 between the power storage element 20 and the first wall portion 41a is set. , It is larger than the above distance D8 in the space S1. As a result, the heat of the high-temperature gas discharged from the gas discharge valve 24 can be insulated in the space S2 and then transferred to the space S1.

In other regions, the distance in space S2 is smaller than the distance in space S1, but the distance is not limited to this, and in all regions, the distance in space S2 is the distance in space S1. It may be larger than the distance. Alternatively, in (c) of FIG. 6, the distance D9 in the space S2 may be smaller than the distance D8 in the space S1.

As described above, according to the power storage device 1 according to the embodiment of the present invention, the first wall portion 41a is arranged between the power storage element 20 and the substrate 50 as an electric device, and the first wall portion is arranged. The substrate 50 is arranged so as to close the opening 42b formed by the second wall portion protruding from the 41a, and forms a space S1 with the first wall portion 41a. As a result, even if the air in the space S1 is heated by the heat from the power storage element 20, the substrate 50 is arranged so as to close the opening 42b, so that the heated air in the space S1 flows out of the space S1. Can be suppressed. As a result, it is possible to suppress the heated air from wrapping around to the front side of the substrate 50, so that the influence of the heat from the power storage element 20 on the substrate 50 can be reduced.

That is, in the present embodiment, since the cover member 60 for protecting the substrate 50 is provided, when the substrate 50 is not arranged so as to close the opening 42b and the opening 42b is open, the space S1 The heated air inside easily wraps around to the front side (plus side in the Z-axis direction) of the substrate 50. In this case, since a large number of electronic components 52 that are easily affected by heat are arranged on the front side of the substrate 50, there is a possibility that the electronic components 52 may be affected. Therefore, according to the power storage device 1, hot air can be prevented from sneaking into the front side of the substrate 50 on which a large number of electronic components 52 are arranged, so that heat given to the electronic components 52 arranged on the front side of the substrate 50 can be prevented. The influence of can be reduced.

Further, since the substrate 50 is arranged so that the distance between the substrate 50 and the second wall portion is smaller than the distance between the substrate 50 and the first wall portion 41a, the substrate 50 is arranged from between the substrate 50 and the second wall portion. , It is possible to suppress the outflow of heated air. Therefore, it is possible to suppress the heated air from wrapping around to the front side of the substrate 50, and it is possible to reduce the influence of the heat from the power storage element 20 on the substrate 50.

Further, since the substrate support portion 43 that supports the substrate 50 is fixed to the first wall portion 41a, the first wall portion 41a has a function of reducing the influence of heat from the power storage element 20 on the substrate 50. It has two functions, that is, and a function that supports the substrate 50.

If gas is ejected from the gas discharge valve 24 of the power storage element 20 at the time of abnormality, the entire power storage device 1 may be damaged. However, even in such an abnormal state, by reducing the influence of the heat from the power storage element 20 on the substrate 50, the state of the power storage element 20 can be monitored and protected for as long as possible, and the power storage device 1 Can be protected. Further, it is useful as a heat countermeasure for the substrate 50 to function normally even at the timing of transition from the normal time to the abnormal time (a state in which a little gas leaks) before the power storage device 1 is destroyed.

(Modification example)
Next, a modified example of the above embodiment will be described. FIG. 7 is a cross-sectional view showing a configuration in a state where the holding member 40, the substrate 50, and the cover member 60 according to the modified example of the embodiment are assembled. It should be noted that the figure corresponds to FIG. 6 (c).

As shown in FIG. 7, the holding member wall portion 42 in this modification has an elastic member 42c that comes into contact with the substrate 50 on the stepped portion 42a. Since other configurations of this modification are the same as those of the above embodiment, detailed description thereof will be omitted.

The elastic member 42c is a member having elasticity that abuts (surface contact) with the surface of the substrate 50 on the first wall portion 41a side, and is arranged at least between two adjacent substrate support portions 43. In the present embodiment, the elastic member 42c is arranged in an annular shape along the outer circumference of the substrate 50. That is, the elastic member 42c is arranged on the annular step portion 42a over the entire step portion 42a.

With such a configuration, the second wall portion has an abutting portion that abuts on the surface of the substrate 50 on the first wall portion 41a side, and the abutting portion has an elastic member 42c that abuts on the substrate 50. It will be. Further, the contact portion is arranged between the two substrate support portions 43 that support the substrate 50, and the contact portion is arranged in an annular shape along the outer circumference of the substrate 50.

The elastic member 42c is preferably formed of a member having more elasticity than the step portion 42a and the substrate 50, and has, for example, a rubber, a sponge, or a rubber, a sponge, or a elastic modulus or Young's modulus than the step portion 42a and the substrate 50. It is made of low resin or the like.

As described above, the power storage device according to the present modification can also have the same effect as that of the above embodiment. In particular, since the second wall portion has an abutting portion that abuts on the surface of the substrate 50 on the first wall portion 41a side, in the abutting portion, from between the substrate 50 and the second wall portion, It is possible to suppress the outflow of heated air. Therefore, it is possible to suppress the heated air from wrapping around to the front side of the substrate 50, and it is possible to reduce the influence of the heat from the power storage element 20 on the substrate 50.

Further, since the elastic member 42c that abuts on the substrate 50 is provided in the abutting portion, the substrate 50 and the second wall portion can be brought into close contact with each other, so that the space between the substrate 50 and the second wall portion can be brought into close contact with each other. Therefore, it is possible to further suppress the outflow of heated air.

Further, since the contact portion is arranged between the two substrate support portions 43 that support the substrate 50, the substrate 50 is fixed by the two substrate support portions 43, so that the substrate is formed at the contact portion. The 50 and the second wall portion can be easily brought into close contact with each other. Therefore, it is possible to suppress the outflow of heated air from between the substrate 50 and the second wall portion.

Further, since the contact portion is arranged in an annular shape along the outer circumference of the substrate 50, it is possible to suppress the outflow of heated air from between the substrate 50 and the second wall portion on the outer circumference of the substrate 50. can do.

The elastic member 42c may not be continuously formed over the entire circumference of the outer periphery of the substrate 50, may be formed intermittently in an annular shape, or may be formed in an annular shape, not in an annular shape, but on the outer circumference of the substrate 50. It may be formed only partially.

Further, the holding member wall portion 42 may not have the elastic member 42c, but may have a configuration in which the stepped portion 42a directly abuts (surface contact) with the substrate 50. That is, the second wall portion may have a stepped portion 42a as a contact portion. Also in this case, the position where the step portion 42a abuts on the substrate 50 is the same as the position where the elastic member 42c described above abuts on the substrate 50.

Although the power storage device according to the embodiment of the present invention and the modified example thereof has been described above, the present invention is not limited to the above-described embodiment and the modified example thereof. That is, it should be considered that the embodiments disclosed this time and examples thereof are exemplary in all respects and are not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

For example, in the above-described embodiment and its modification, the substrate 50 is arranged so that the outer periphery thereof is close to the second wall portion so as to close the opening 42b. However, the substrate 50 may be arranged so that a part or all of the outer periphery thereof is in contact with the second wall portion to close the opening 42b. Alternatively, a member such as an elastic member as shown in the above modification may be arranged in the gap between the outer circumference of the substrate 50 and the second wall portion.

Further, in the above-described embodiment and its modification, both the holding member wall portion 42 and the cover member wall portion 62 have a shape in which a part of the outer peripheral portion is missing, and the holding member wall portion 42 and the cover member wall portion 42 are formed. It was decided that the portion 62 constitutes the annular second wall portion. However, the holding member wall portion 42 may be configured such that the holding member wall portion 42 alone constitutes the annular second wall portion without chipping the outer peripheral portion, and similarly, the outer peripheral portion of the cover member wall portion 62 may be formed. The second wall portion may be formed only by the cover member wall portion 62 without being chipped. Alternatively, both the holding member wall portion 42 and the cover member wall portion 62 form an annular second wall portion having a double wall portion by the holding member wall portion 42 and the cover member wall portion 62 without chipping the outer peripheral portion. It may be the configuration that is used.

Further, in the above-described embodiment and its modification, the power storage device includes the substrate 50 as an electric device arranged so as to close the opening of the second wall portion. However, the electric device may be provided with a relay, a fuse, or other electric device.

Further, in the above-described embodiment and its modification, the distance between the substrate 50 and the second wall portion is smaller than the minimum distance between the substrate 50 and the first wall portion 41a. However, the distance between the substrate 50 and the second wall portion may be smaller than the average distance or the maximum distance between the substrate 50 and the first wall portion 41a. Further, when the distance between the substrate 50 and the second wall portion also varies, the maximum distance, the average distance or the minimum distance between the substrate 50 and the second wall portion is the substrate 50 and the first wall portion. It may be smaller than the minimum distance, the average distance or the maximum distance to the portion 41a.

Further, in the above-described embodiment and its modification, the distance between the substrate 50 and the second wall portion is smaller than the distance between the substrate 50 and the first wall portion 41a on the entire circumference of the substrate 50. And said. However, there may be some places where the distance between the substrate 50 and the second wall portion is not smaller than the distance between the substrate 50 and the first wall portion 41a.

Further, in the above-described embodiment and its modification, the holding member 40 has a substrate support portion 43 that supports the substrate 50. However, the member having the support portion for supporting the substrate 50 is not limited to the holding member 40, and for example, the cover member 60 may have the support portion for supporting the substrate 50.

Further, a form constructed by arbitrarily combining the components included in the above-described embodiment and its modifications is also included in the scope of the present invention.

It should be noted that the present invention can be realized not only as a power storage device but also as a structure for reducing the thermal influence on the electric device (configuration of the first wall portion 41a and the second wall portion with respect to the electric device) included in the power storage device. can do.

The present invention can be applied to a power storage device including a power storage element such as a lithium ion secondary battery.

1 Power storage device 20 Power storage element 41a First wall part 42 Holding member wall part 42b Opening 42c Elastic member 43 Board support part 50 Board 62 Cover member wall part

Claims (9)

With a power storage element
Electrical equipment with at least one of a board, relay and fuse,
A first wall portion between the power storage element and the electric device, which is arranged at a position adjacent to the power storage element,
It is provided with a second wall portion that protrudes from the first wall portion in the direction toward the electric device and is arranged in an annular shape along the first wall portion to form an opening on the electric device side. ,
The electric device is fixed to the first wall portion and the second wall portion, and is arranged so as to close the opening in a state where a gap is formed between the first wall portion and the second wall portion. A space is formed between the first wall and the wall.
The distance between the electric device and the second wall portion in the gap is smaller than the distance between the electric device and the first wall portion in the space.
Power storage device. The power storage element has an electrode terminal and has an electrode terminal.
The power storage device according to claim 1, wherein the electric device is arranged on the side of the power storage element on which the electrode terminal is arranged to form a space between the power storage element and the first wall portion. The power storage element has a gas discharge valve and has a gas discharge valve.
The power storage device according to claim 1 or 2, wherein the electric device is arranged on the side of the power storage element on which the gas discharge valve is arranged to form a space between the power storage element and the first wall portion. Further, any one of claims 1 to 3 is provided with a cover member which is arranged at a position where the electric device is sandwiched between the first wall portion and covers the electric device while forming a space between the electric device and the electric device. The power storage device described in. 6. Power storage device. The power storage device according to claim 5, wherein the contact portion has an elastic member that contacts the electric device. The power storage device according to claim 5 or 6, wherein the contact portion is arranged between two support portions that support the electric device. The power storage device according to any one of claims 5 to 7, wherein the contact portion is arranged in a ring shape along the outer circumference of the electric device. The power storage device according to any one of claims 1 to 8 , further comprising a support portion fixed to the first wall portion and supporting the electric device.

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