JP2024012915A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device to which other members different from a power storage element can be stably fixed.

SOLUTION: A power storage device 1 comprises a power storage element 200 connected to a bus bar 33, and other members different from the bus bar 33 and the power storage element 200 (a sensor 81, a bus bar frame 17). The power storage element 200 comprises a terminal (an electrode terminal 240) connected to the bus bar 33, a container 210, and an insulation member (an upper gasket 250) that is disposed outside the container 210 and has a portion interposed between the terminal and the container 210. The insulation member has a fixing portion 251 to which the other members are fixed.

SELECTED DRAWING: Figure 5

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a power storage device.

Conventionally, a power storage device is known that includes a power storage element, an exterior body that houses the power storage element, and a holding member that is housed in the exterior body and holds a bus bar that is connected to the power storage element. Such a power storage device is provided with a sensor for detecting the state of a power storage element, and this sensor is adhered and fixed to a holding member with an adhesive (see, for example, Patent Document 1).

International Publication No. 2018/198896

By the way, when fixing another component (sensor) different from the energy storage element with adhesive, the other component may shift its position until the adhesive hardens, or the other component may shift due to stress generated when the adhesive hardens. Due to deformation, other members may not be stably fixed.

An object of the present invention is to provide a power storage device that can stably fix a member other than a power storage element.

In order to achieve the above object, a power storage device according to one aspect of the present invention includes a power storage element connected to a bus bar, and another member different from the bus bar and the power storage element, and the power storage element is connected to the bus bar. , a container, and an insulating member disposed outside the container and having a portion interposed between the terminal and the container, the insulating member to which the other member is fixed. It has a fixed part.

According to the present invention, it is possible to provide a power storage device that can stably fix other members.

FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment. FIG. 2 is an exploded perspective view showing each component when the power storage device according to the embodiment is disassembled. FIG. 1 is a perspective view showing the appearance of a power storage element according to an embodiment. It is a perspective view showing a busbar frame concerning an embodiment. FIG. 2 is a cross-sectional view showing a fixing structure between a fixing part of an upper gasket and a sensor according to an embodiment. FIG. 3 is a cross-sectional view showing a fixing structure between the fixing portion of the upper gasket and the busbar frame according to the embodiment. 7 is a cross-sectional view showing a fixing structure between a fixing part and a sensor according to Modification 1. FIG. FIG. 7 is a cross-sectional view showing a fixing structure between a fixing part and a sensor according to a second modification.

(1) A power storage device according to one aspect of the present invention includes a power storage element connected to a bus bar, and another member different from the bus bar and the power storage element, and the power storage element has a terminal connected to the bus bar. a container, and an insulating member disposed outside the container and between the terminal and the container, the insulating member being exposed from the terminal and to which the other member is fixed. It has a fixed part.

According to this, other members such as a sensor are fixed to the fixing portion of the insulating member, so other members can be fixed without using an adhesive. This makes it possible to suppress misalignment, deformation, etc. of other members caused by the adhesive, and to stably fix the other members.

(2) In the power storage device according to (1) above, the other member may be a member facing a terminal arrangement surface of the container on which the terminals are arranged.

According to this, since the other member such as the sensor is a member facing the terminal arrangement surface of the container, the member can be stably fixed by the fixing portion of the insulating member without using an adhesive.

(3) In the power storage device according to (2) above, the other member may include a sensor that comes into contact with the terminal arrangement surface and detects the state of the power storage element.

According to this, since the sensor that detects the state of the power storage element is fixed to the fixing portion of the insulating member, it is possible to stably fix the state sensor without using adhesive.

(4) In the power storage device according to (3) above, the sensor includes a main body portion having a detection surface that contacts the terminal arrangement surface to detect the state, and a plurality of protruding pieces protruding from the main body portion. and each of the plurality of protruding pieces may be fixed to the fixing part.

According to this, since the plurality of protruding pieces of the sensor are fixed to the fixed portion of the insulating member, the detection surface can be stably brought into contact with the terminal arrangement surface. Therefore, it is possible to improve the accuracy of state detection by the sensor.

(5) In the power storage device according to any one of (1) to (4) above, the other member may include a holding member that holds the bus bar.

According to this, since the holding member that holds the bus bar is fixed to the fixing portion of the insulating member, the holding member can be stably fixed without using an adhesive.

(6) In the power storage device according to any one of (1) to (5) above, the fixing portion may have a protrusion connected to a hole formed in the other member.

According to this, since the protrusion provided on the fixing part is connected to the hole formed in the other member, the other member can be connected and fixed to the fixing part with a simple structure.

(Embodiment)
Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Note that the embodiments described below are all inclusive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples, and do not limit the present invention. In each figure, dimensions etc. are not strictly illustrated.

In the following description and drawings, the direction in which the power storage elements are arranged, the direction in which the power storage elements face the long sides of the container, or the thickness direction of the container is defined as the X-axis direction. The direction in which the electrode terminals in one power storage element are arranged or the direction in which the short sides of the container of the power storage element face each other is defined as the Y-axis direction. The direction in which the main body and the outer lid are lined up in the exterior body of the power storage device, or the vertical direction is defined as the Z-axis direction. The Z-axis direction is also the insertion direction when inserting a plurality of power storage elements into the main body opening of the main body. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect with each other (in the following embodiments, they intersect at right angles). Note that depending on the mode of use, the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described as the vertical direction below. In the following description, for example, the plus side in the X-axis direction indicates the side in the direction of the arrow 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. Furthermore, expressions indicating relative directions or orientations, such as parallel and orthogonal, include cases where the directions or orientations are not strictly speaking. For example, when two directions are orthogonal, it does not only mean that the two directions are completely orthogonal, but also that they are substantially orthogonal, that is, there is a difference of only a few percent, for example. It also means to include. In the following description, when the expression "insulation" is used, it means "electrical insulation".

[General explanation of power storage device]
First, a general description of the power storage device 1 according to the embodiment will be given using FIGS. 1 and 2. FIG. 1 is a perspective view showing the appearance of a power storage device 1 according to an embodiment. FIG. 2 is an exploded perspective view showing each component when power storage device 1 according to the embodiment is disassembled.

The power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a substantially rectangular parallelepiped shape in this embodiment. For example, the power storage device 1 is a battery module (battery assembly) used for power storage, power supply, or the like. Specifically, the power storage device 1 is used for driving or starting an engine of a moving object such as a car, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. It is used as a battery etc. Examples of the above-mentioned vehicles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and fossil fuel (gasoline, diesel oil, liquefied natural gas, etc.) vehicles. Examples of the above-mentioned railway vehicles for electric railways include electric trains, monorails, linear motor cars, and hybrid electric trains equipped with both a diesel engine and an electric motor. The power storage device 1 can also be used as a stationary battery or the like used for home or business purposes.

As shown in FIGS. 1 and 2, power storage device 1 includes a power storage element 200 and an exterior body 10 that accommodates a plurality of power storage elements 200. Exterior body 10 includes a main body 11 that accommodates a plurality of power storage elements 200, a busbar frame 17 arranged above the plurality of power storage elements 200, and an outer lid 12 that covers the busbar frame 17 above.

Exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of power storage device 1 . In other words, the exterior body 10 is a member that fixes the plurality of power storage elements 200, the bus bar frame 17, etc. in a predetermined position, and protects these elements from impact and the like.

The main body part 11 is a bottomed rectangular cylindrical member with an open upper part, and the open part is the main body opening part 111. The main body opening 111 has a substantially rectangular shape in plan view. Inside the main body opening 111 of the main body 11, in addition to the plurality of power storage elements 200 and the busbar frame 17, a plurality of busbars 33 held by the busbar frame 17, a connection unit 80 including a control circuit, etc., and a pair of An end plate 39 is housed therein.

The outer lid 12 is a rectangular member that closes the main body opening 111 of the main body 11 . The outer cover 12 is joined to the main body 11 in a state that covers the main body opening 111 of the main body 11. The outer lid 12 has a positive external terminal 91 and a negative external terminal 92. The external terminals 91 and 92 are electrically connected to the plurality of power storage elements 200 via the connection unit 80 and the bus bar 33, and the power storage device 1 receives electricity from the outside via the external terminals 91 and 92. Charges and discharges electricity to the outside. The external terminals 91 and 92 are made of a conductive member made of a metal such as a copper alloy such as brass, copper, aluminum, or an aluminum alloy.

The main body 11 and outer lid 12 of the exterior body 10 are made of, for example, polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (modified (including PPE)), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyetheretherketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyether It is formed of an insulating member such as sulfone (PES), polyamide (PA), ABS resin, or a composite material thereof, or a metal coated with an insulating coating. The exterior body 10 thereby prevents the power storage element 200 and the like from coming into contact with external metal members and the like. Note that the exterior body 10 may be formed of a conductive member such as metal as long as the electrical insulation of the power storage element 200 and the like is maintained.

The power storage element 200 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. . The power storage element 200 has a flat rectangular parallelepiped shape (prismatic shape), and in this embodiment, eight power storage elements 200 are arranged in the X-axis direction. Note that the shape of the power storage elements 200 and the number of power storage elements 200 arranged are not limited. The power storage element 200 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or a capacitor, and may be a battery that does not require charging by the user. It may also be a primary battery that can use stored electricity. Power storage element 200 may be a solid electrolyte battery. Power storage element 200 may be a pouch type power storage element.

FIG. 3 is a perspective view showing the appearance of power storage element 200 according to the embodiment. The power storage element 200 includes a container 210, a pair of electrode terminals 240 (a positive electrode and a negative electrode), and an upper gasket 250. Further, inside the container 210, a lower gasket, an electrode body, a pair of current collectors (positive electrode and negative electrode), an electrolytic solution (non-aqueous electrolyte), etc. are housed, but illustration of these is omitted. . The type of electrolyte is not particularly limited as long as it does not impair the performance of power storage element 200, and various types can be selected.

In addition to the above-mentioned components, the power storage element 200 may include a spacer placed on the side or below the electrode body, an insulating film that wraps around the electrode body, and the like. Further, an insulating film (such as a shrink tube) may be placed around the container 210 to cover the outer surface of the container 210. The material of the insulating film is not particularly limited as long as it can ensure the insulation required for the electricity storage element 200, but for example, insulating resin such as PC, PP, PE, PPS, PET, PBT, or ABS resin, Examples include epoxy resin, Kapton (registered trademark), Teflon (registered trademark), silicone, polyisoprene, and polyvinyl chloride.

The container 210 is a rectangular parallelepiped (square or box-shaped) case that includes a container body 220 with an opening formed therein and a lid 230 that closes the opening of the container body 220. The container main body 220 is a rectangular cylindrical member having a bottom and forming the main body of the container 210, and has an opening formed in the positive direction of the Z-axis. The lid 230 is a rectangular flat plate that constitutes the lid of the container 210, and is arranged in the positive Z-axis direction of the container body 220 and extends in the Y-axis direction. The lid body 230 includes a gas discharge valve 231 that releases the pressure inside the container 210 when the pressure rises excessively, and a liquid injection part (not shown) for injecting electrolyte into the inside of the container 210. ), etc. are provided. The material of the container 210 (container main body 220 and lid 230) is not particularly limited, and may be a weldable (joinable) metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate, but resin You can also use The container 210 has a structure in which the electrode body and the like are housed inside the container body 220, and then the container body 220 and the lid 230 are joined by welding or the like, thereby sealing the inside.

The container 210 has a pair of long sides 211 on both sides in the X-axis direction, a pair of short sides 212 on both sides in the Y-axis direction, and a bottom surface 213 on the negative Z-axis side. The long side surface 211 is a rectangular flat portion that forms the long side surface of the container 210. The long side 211 is adjacent to the short side 212 and the bottom 213. The short side surface 212 is a rectangular flat portion that forms the short side surface of the container 210. The bottom surface 213 is a rectangular flat portion that forms the bottom surface of the container 210 and is disposed adjacent to the long side surface 211 and the short side surface 212.

Electrode terminal 240 is a terminal (a positive electrode terminal and a negative electrode terminal) of power storage element 200 arranged on lid 230. Specifically, the electrode terminal 240 is arranged on the upper surface (terminal arrangement surface 230a) of the lid 230, and a part thereof penetrates the lid 230 and is joined to the current collector. Thereby, the electrode terminal 240 is electrically connected to the positive electrode plate and the negative electrode plate of the electrode body via the current collector. In other words, the electrode terminal 240 is a metal terminal for guiding electricity stored in the electrode body to the external space of the power storage element 200 and for introducing electricity into the internal space of the power storage element 200 in order to store electricity in the electrode body. It is a manufactured member. The electrode terminal 240 is made of aluminum, aluminum alloy, copper, copper alloy, or the like.

The electrode body is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate has a positive electrode active material layer formed on a positive electrode base material layer, which is a current collector foil made of metal such as aluminum or an aluminum alloy. The negative electrode plate has a negative electrode active material layer formed on a negative electrode base material layer which is a current collecting foil made of metal such as copper or copper alloy. As the active material used for the positive electrode active material layer and the negative electrode active material layer, any known material can be used as appropriate as long as it is capable of intercalating and deintercalating lithium ions. As the separator, a microporous sheet made of resin, a nonwoven fabric, or the like can be used. In this embodiment, the electrode body is formed by stacking electrode plates (a positive electrode plate and a negative electrode plate) in the X-axis direction. In addition, the electrode body is a wound type electrode body formed by winding electrode plates (positive electrode plate and negative electrode plate), and a laminated type (stack type) formed by laminating a plurality of flat electrode plates. The electrode body may be in any form, such as an electrode body or a bellows-shaped electrode body in which an electrode plate is folded into a bellows shape.

The current collectors are conductive members (a positive electrode current collector and a negative electrode current collector) that are electrically connected to the electrode terminal 240 and the electrode body. Note that the positive electrode current collector is formed of aluminum or an aluminum alloy, etc., like the positive electrode base material layer of the positive electrode plate, and the negative electrode current collector is formed of copper, copper alloy, etc., like the negative electrode base material layer of the negative electrode plate. has been done.

The upper gasket 250 is a gasket that is disposed between the lid 230 and each electrode terminal 240, and insulates and seals between the lid 230 and each electrode terminal 240. That is, the upper gasket 250 is an example of an insulating member. The upper gasket 250 is a member to which other members different from the bus bar 33 and the power storage element 200 are fixed, and the details thereof will be described later. The lower gasket is disposed between the lid 230 and each current collector, and is a gasket that insulates and seals between the lid 230 and each current collector. The upper gasket 250 and the lower gasket may be made of any material as long as it has electrical insulation properties.

As shown in FIG. 2, the bus bar 33 is disposed on at least two power storage elements 200 while being held by the bus bar frame 17, and the electrode terminals 240 (positive electrode terminal and negative electrode terminal) of the at least two power storage elements 200. It is a rectangular plate-like member that electrically connects. The bus bar 33 is made of a metal conductive member such as copper, copper alloy, aluminum, aluminum alloy, nickel, or clad material. In this embodiment, five bus bars 33 are used to connect two power storage elements 200 in parallel to form four sets of power storage element groups, and the four sets of power storage element groups are connected in series. Connected.

The connection unit 80 is a unit that includes a plurality of bus bars 33, a control board, etc., and connects a power storage element group consisting of eight power storage elements 200 and external terminals 91 and 92. The control board included in the connection unit 80 has a plurality of electrical components, and these electrical components form a detection circuit that detects the state of each power storage element 200, a control circuit that controls charging and discharging, etc. There is. The connection unit 80 is provided with a connector section 89 for a detection circuit or control circuit. In this embodiment, the connection unit 80 is fixed to the busbar frame 17. The detection circuit and control circuit may be formed on separate substrates. The connection unit 80 does not need to have a control board. In this case, for example, a control device placed outside power storage device 1 may control charging and discharging of each power storage element 200. Further, a sensor 81 attached to the power storage element 200 is electrically connected to the detection circuit. Here, sensor 81 is a sensor that detects the state of power storage element 200. Specifically, the sensor 81 includes a temperature sensor (thermistor) that detects the temperature of the power storage element 200, a voltage sensor that detects the voltage of the power storage element 200, and the like.

The busbar frame 17 is a member that is arranged above the plurality of power storage elements 200 (on the side where the electrode terminals 240 are arranged). In this embodiment, busbar frame 17 is a holding member that holds busbar 33 and sensor 81 attached to power storage element 200. More specifically, the busbar frame 17 is a member that can hold a plurality of busbars 33, connection units 80, sensors 81, and other wiring (not shown), and can restrict the positions of these members. be. Further, the busbar frame 17 is provided with a plurality of busbar openings 17a that hold each of the plurality of busbars 33 and expose a part of each of the plurality of busbars 33 to the side of the plurality of power storage elements 200. . Furthermore, by being fixed to the main body portion 11, the busbar frame 17 also has the role of, for example, restricting the movement of the plurality of power storage elements 200 upward (toward the positive side in the Z-axis direction).

The busbar frame 17 is sometimes called a "busbar plate" or an "inner lid," for example. The busbar frame 17 is made of, for example, PC, PP, PE, PS, PPS, PPE (including modified PPE), PET, PBT, PEEK, PFA, PTFE, PES, PA, ABS resin, or a composite material thereof. It is made of an insulating member or a metal coated with an insulating coating.

The pair of end plates 39 are rectangular plates disposed within the main body 11 at positions that collectively sandwich the plurality of power storage elements 200 . Specifically, the pair of end plates 39 are arranged parallel to the YZ plane at positions sandwiching the plurality of power storage elements 200 in the X-axis direction. That is, the pair of end plates 39 are arranged so as to overlap with the long side surface 211 of the container 210 of the electricity storage element 200 arranged at the outermost position. The end plate 39 is made of, for example, a metal coated with an insulating coating.

[Fixing structure between upper gasket and other parts]
The fixing structure between the upper gasket 250 and other members will be explained. The other members are members facing the terminal arrangement surface 230a of the power storage element 200, and in this embodiment, the bus bar frame 17 and the sensor 81 are examples of the other members.

First, the upper gasket 250 will be explained. As shown in FIG. 3, the upper gaskets 250 have the same shape, but differ in that they are arranged in an attitude rotated by 180 degrees with respect to the Z-axis direction. Here, of the pair of upper gaskets 250, the upper gasket 250 disposed in the negative direction of the Y-axis will be described as an example, and a description of the upper gasket 250 disposed in the positive direction of the Y-axis will be omitted.

The upper gasket 250 has a fixing part 251 exposed from the electrode terminal 240. The fixing part 251 is a part to which other members (busbar frame 17 and sensor 81) are fixed. Specifically, the fixing portion 251 is a portion extending from the electrode terminal 240 in the positive direction of the Y-axis. In this way, the fixing portion 251 is a portion located outside the electrode terminal 240 when viewed from above. The fixing portion 251 has an opening 252 that exposes the terminal placement surface 230a, and a pair of protrusions 253 located at positions sandwiching the opening 252 in the X-axis direction. The pair of protrusions 253 are cylindrical protrusions that protrude in the positive direction of the Z-axis, and are inserted into holes (described later) formed in other members and fixed by heat caulking. FIG. 3 shows the protrusion 253 before thermal caulking.

Next, the busbar frame 17, which is an example of another member, will be explained. FIG. 4 is a perspective view showing the busbar frame 17 according to the embodiment. Specifically, FIG. 4 is a perspective view of the busbar frame 17 viewed from above.

As shown in FIG. 4, the busbar frame 17 includes a gas path section 71, a mounting section 72, and a busbar installation section 73. The gas path portion 71 is a portion that is disposed at the center of the busbar frame 17 in the Y-axis direction and extends in the X-axis direction. Gas path section 71 is a path for gas discharged from gas exhaust valve 231 of power storage element 200.

Attachment portion 72 is a portion to which upper gasket 250 of each power storage element 200 is attached. The attachment portions 72 are a pair of portions that sandwich the gas path portion 71 in the Y-axis direction, and are provided to extend in the X-axis direction. A plurality of holes 74 and a plurality of sensor openings 75 are arranged in the X-axis direction at a portion of the mounting portion 72 in the Y-axis plus direction. On the other hand, in the mounting portion 72, a plurality of holes 74 and a plurality of sensor openings 75 are also arranged in the X-axis direction at a portion in the Y-axis minus direction. The plurality of holes 74 are divided into two groups. Each set of holes 74 corresponds to each power storage element 200. To explain more specifically, in the mounting part 72, in the Y-axis positive direction, from the X-axis negative direction, there are two sets of holes 74, one sensor opening 75, four sets of holes 74, and one sensor. They are arranged in the order of openings 75 for use. In the mounting part 72, in the Y-axis minus direction, one sensor opening 75, three sets of holes 74, one sensor opening 75, and three sets of holes 74 are arranged in the order from the X-axis minus direction. has been done. That is, the first, third, fifth, and eighth power storage elements 200 from the negative direction of the X-axis are provided with sensor openings 75 and one set of holes 74, and the other power storage elements 200 Two sets of holes 74 are provided in correspondence with each other.

In this embodiment, each sensor opening 75 is formed in a rectangular shape in a plan view (when viewed from the Z-axis direction), but it may be formed into a shape that allows the sensor 81 to be inserted therein. It may be Mr. In this embodiment, each hole 74 is formed in a circular shape in a plan view (when viewed from the Z-axis direction), but a projection 253 (described later) of the upper gasket 250 is inserted Any possible shape may be used.

The bus bar installation portions 73 are a pair of portions that sandwich the gas path portion 71 and the pair of attachment portions 72 in the Y-axis direction, and are provided to extend in the X-axis direction. The busbar installation part 73 is a part where a plurality of busbars 33 are installed. A plurality of bus bar openings 17a are formed in the bus bar installation portion 73 to expose portions of each bus bar 33 that are connected to the power storage elements 200.

Next, the sensor 81 will be explained in detail. FIG. 5 is a sectional view showing a fixing structure between the fixing portion 251 of the upper gasket 250 and the sensor 81 according to the embodiment. Specifically, FIG. 5 is a cross-sectional view taken along the line VV in FIG. 4, with the sensor 81 fixed. As shown in FIG. 5, the sensor 81 includes a sensor body 82 and a mounting member 83. Here, a temperature detection sensor is illustrated as the sensor 81, but a voltage detection sensor may also be used.

Sensor main body 82 is a part that measures the state of power storage element 200. The sensor main body 82 is formed into a rectangular shape in a plan view, and the bottom surface thereof is a measurement surface 821. Wiring (not shown) connected to the detection circuit of the connection unit 80 is connected to the sensor body 82 . The sensor main body 82 has a substantially rectangular parallelepiped shape that is elongated in the Y-axis direction. That is, the sensor main body 82 is arranged so that the Y-axis direction is the longitudinal direction.

The attachment member 83 is a member for attaching the sensor body 82 to the busbar frame 17. The mounting member 83 is preferably made of a thermally conductive member with relatively high thermal conductivity. For example, the attachment member 83 may be a bent plate of metal such as aluminum or copper. The mounting member 83 integrally includes a housing portion 84 and a pair of protruding pieces 85, and has approximately the same size as the sensor body 82 in the Y-axis direction.

The accommodating portion 84 is a portion that accommodates the sensor main body 82, and is formed into a substantially U-shape when viewed in the Y-axis direction. A measurement surface 821 of the sensor body 82 is in contact with the inner bottom surface of the housing portion 84 . On the other hand, the terminal arrangement surface 230a of the power storage element 200 faces and is in contact with the outer bottom surface of the housing portion 84. As described above, since the mounting member 83 is made of a thermally conductive member with relatively high thermal conductivity, the heat of the power storage element 200 received on the outer bottom surface of the housing section 84 is transferred to the housing section 84. is conducted from the inner bottom surface to the measurement surface 821 of the sensor body 82. Therefore, the outer bottom surface of the accommodating portion 84 can be said to be the detection surface 87 of the sensor 81.

Here, by forming an opening in the bottom of the housing portion 84, the measurement surface 821 of the sensor main body 82 can be exposed from the opening and brought into contact with the terminal arrangement surface 230a of the power storage element 200. In this case, the measurement surface 821 of the sensor body 82 can be referred to as the detection surface 87 of the sensor 81.

Note that a thermally conductive sheet having relatively high thermal conductivity may be laminated on the outer bottom surface of the accommodating portion 84. The outer surface of the thermally conductive sheet contacts the terminal arrangement surface 230a of the power storage element 200. That is, heat from the power storage element 200 is conducted to the measurement surface 821 of the sensor body 82 via the heat conductive sheet and the mounting member 83. In this case, the outer surface of the thermally conductive sheet can be referred to as the detection surface 87 of the sensor 81. The thermally conductive sheet may be made of resin or metal as long as it has insulation properties.

The pair of protruding pieces 85 protrude outward (laterally) from both ends of the accommodating portion 84 along the X-axis direction. That is, it can be said that each protruding piece 85 protrudes outward from the sensor main body 82. Each protruding piece 85 is formed into a flat plate shape and has a hole 851 penetrating in the Z-axis direction. Each protrusion 253 of the upper gasket 250 passes through each hole 851 . Each protrusion 253 fits into the inner circumferential surface of each hole 851 and is in contact with the entire circumference, thereby restricting movement of the sensor 81 in the direction along the XY plane. The upper end of each protrusion 253 is thermally caulked to form a head 254 with a larger diameter. The head 254 of each protrusion 253 is in contact with the upper surface of each protruding piece 85, thereby restricting the upward movement of the sensor 81 (in the Z-axis plus direction). In this state, the sensor 81 is arranged within the sensor opening 75 of the busbar frame 17.

Next, the fixing structure between the busbar frame 17 and the upper gasket 250 will be explained. FIG. 6 is a sectional view showing a fixing structure between the fixing portion 251 of the upper gasket 250 and the busbar frame 17 according to the embodiment. Specifically, FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 4, with the busbar frame 17 fixed.

As shown in FIG. 6, when fixed, the bus bar frame 17 is arranged to face the terminal arrangement surface 230a of the power storage element 200. In this state, each protrusion 253 of the upper gasket 250 passes through a set of holes 74 in the bus bar frame 17. Each protrusion 253 fits into the inner peripheral surface of each hole 74 and is in contact with the entire circumference, thereby restricting movement of the bus bar frame 17 in the direction along the XY plane. The upper end of each protrusion 253 is thermally caulked to form a head 254 with a larger diameter. The head 254 of each protrusion 253 is in contact with the upper surface of the busbar frame 17, thereby restricting the upward movement of the busbar frame 17 (in the Z-axis plus direction).

[Effects etc.]
As described above, according to the power storage device 1 according to the present embodiment, other members (sensor 81, busbar frame 17) are fixed to the fixing portion 251 of the upper gasket 250, so that other members (sensor 81, busbar frame 17) can be fixed without using adhesive. The member can be fixed. This makes it possible to suppress misalignment, deformation, etc. of other members caused by the adhesive, and to stably fix the other members.

Since the other member is the member facing the terminal arrangement surface 230a of the power storage element 200, the member that was conventionally fixed to the terminal arrangement surface with adhesive can be stabilized by the fixing part 251 of the upper gasket 250 without using adhesive. and can be fixed.

Since the sensor 81 that detects the state of the power storage element 200 is fixed to the fixing part 251 of the upper gasket 250, it is possible to stably fix the sensor 81 without using adhesive.

Since the pair of protruding pieces 85 of the sensor 81 are fixed to the fixing portion 251 of the upper gasket 250, the detection surface 87 can be stably brought into contact with the terminal placement surface 230a. Therefore, it is possible to improve the accuracy of state detection by the sensor 81.

Since the busbar frame 17 holding the busbar 33 is fixed to the fixing portion 251 of the upper gasket 250, the busbar frame 17 can be stably fixed without using adhesive.

Since the protrusion 253 provided on the fixing part 251 is connected to the hole formed in the other member (the hole 851 of the sensor 81, the hole 74 of the bus bar frame 17), other members can be attached to the fixing part 251 with a simple structure. Can be connected and fixed.

[Description of modification]
Each modification of the above embodiment will be described below. In the following description, parts that are the same as those in the above embodiment or other modified examples may be given the same reference numerals, and the description thereof may be omitted. In the following description, the fixing structure between the fixing part and the sensor is illustrated, but the same can be said of the fixing structure between the fixing part and the bus bar frame.

(Modification 1)
In the embodiment described above, the case where the fixing part 251 has the head 254 formed by thermal caulking is illustrated. In this first modification, a fixing portion 251a employing a snap-fit structure will be described. FIG. 7 is a sectional view showing a fixing structure between the fixing part 251a and the sensor 81 according to the first modification. FIG. 7 is a diagram corresponding to FIG. 5.

The fixing portion 251a includes a shaft portion 255a and a head portion 256a, which are formed at positions corresponding to the pair of projections 253 described above. The shaft portion 255a has an outer diameter smaller than the inner diameter of the hole 851 of the protruding piece 85, and is arranged within the hole 851 so as to be elastically deformable. The head 256a has a tapered shape with an inclined surface, and a base end protrudes outward from the shaft 255a. The base end portion of the head portion 256a is formed in a size that allows it to pass through the hole portion 851.

When assembling the sensor 81 to the fixed part 251a, the operator inserts the head 256a into the hole 851 of the protruding piece 85 of the sensor 81. At this time, the inclined surface of the head 256a is pushed by the protruding piece 85, and the shaft portion 255a is elastically deformed. Thereafter, when the head 256a passes through the hole 851 of the protruding piece 85, the shaft 255a elastically returns to its original shape. Thereby, the base end of the head 256a presses the upper surface of the protruding piece 85, and the protruding piece 85 is prevented from coming off.

(Modification 2)
In a second modification, a fixing portion 251b that employs a fixing structure other than thermal caulking or snap-fit structure will be described. FIG. 8 is a cross-sectional view showing a fixing structure between the fixing part 251b and the sensor 81 according to the second modification. FIG. 8 is a diagram corresponding to FIG. 5.

As shown in FIG. 8, the fixing portion 251b according to the second modification has a shaft portion 257b formed at a position corresponding to the pair of projections 253 described above. The shaft portion 257b is inserted and fitted into the hole 851 of the protruding piece 85 of the sensor 81. A head 258b, which is separate from the shaft 257b, is attached to the tip of the shaft 257b. The head 258b is fixed to the shaft portion 257b by fitting, press-fitting, screwing, adhesion, welding, or the like. Thereby, the head 258b presses the upper surface of the protruding piece 85, thereby preventing the protruding piece 85 from coming off.

[others]
Although the power storage device according to the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. In other words, the embodiments disclosed this time are illustrative in all respects and are not restrictive, and the scope of the present invention includes all changes within the meaning and scope equivalent to the scope of the claims. included.

For example, in the above embodiment, the sensor 81 and the bus bar frame 17 are illustrated as other members. However, the other members may be any other members as long as they are different from the bus bar 33 and the power storage element 200.

In the embodiment described above, the sensor 81 and the bus bar frame 17 are each fixed to the upper gasket 250. However, only one of the sensor 81 and the busbar frame 17 may be fixed to the upper gasket 250.

In the embodiment described above, the sensor 81 having a pair of protruding pieces 85 is exemplified. However, it is sufficient that the sensor 81 is provided with at least one protruding piece 85.

In the embodiment described above, the power storage device 1 having a plurality of power storage elements 200 is illustrated, but the power storage device may include a single power storage element.

A configuration constructed by arbitrarily combining the components included in the above embodiments is also included within the scope of the present invention.

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 10 Exterior body 17 Bus bar frame (holding member, other members)
33 Bus bar 74, 851 Hole 75 Sensor opening 81 Sensor (other parts)
82 Sensor body 83 Mounting member 84 Accommodation part 85 Projection piece 87 Detection surface 200 Energy storage element 210 Container 220 Container body 230 Lid 230a Terminal arrangement surface 240 Electrode terminal (terminal)
250 Upper gasket (insulating member)
251, 251a, 251b Fixed part 252 Opening part 253 Projection 254, 256a, 258b Head part 255a, 257b Shaft part 821 Measurement surface

Claims (6)

a power storage element connected to the bus bar;
and another member different from the bus bar and the electricity storage element,
The electricity storage element is
a terminal connected to the bus bar;
a container and
an insulating member disposed outside the container and between the terminal and the container,
The insulating member has a fixing part that is exposed from the terminal and to which the other member is fixed. The power storage device. The power storage device according to claim 1, wherein the other member is a member facing a terminal arrangement surface of the container on which the terminal is arranged. The power storage device according to claim 2, wherein the other member includes a sensor that comes into contact with the terminal arrangement surface and detects the state of the power storage element. The sensor is
a sensor body having a detection surface that contacts the terminal arrangement surface to detect the state;
having a plurality of protruding pieces protruding from the sensor main body,
The power storage device according to claim 3, wherein each of the plurality of protruding pieces is fixed to the fixing part. The power storage device according to claim 1 , wherein the other member includes a holding member that holds the bus bar. The power storage device according to claim 1 or 2, wherein the fixing part has a protrusion connected to a hole formed in the other member.

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