JP6330589B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device including a power storage element and a measurement unit that measures the state of the power storage element.

  2. Description of the Related Art Conventionally, a configuration in which a temperature sensor (temperature detector) for detecting the temperature of a power storage device is provided in a power storage device (assembled battery) including a plurality of power storage elements (battery cells) is known (see Patent Document 1). . In the power storage device of Patent Document 1, the temperature sensor is arranged on the direction side of the plurality of power storage elements that intersects the arrangement direction of the plurality of power storage elements. And the detection result of the said temperature sensor is utilized for control of an electrical storage apparatus.

JP2013-20891A

  However, in the above-described conventional power storage device, for example, when vibration or shock is applied to the power storage device, the temperature sensor or the power storage element moves, so that the positional relationship between the temperature sensor and the power storage element departs from an optimal state. There is a risk that.

  The present invention has been made to solve the above-described problem, and an object thereof is to provide a power storage device that can accurately measure the state of a power storage element.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention is a power storage device including a power storage element, wherein the power storage element is brought into contact with a measurement unit that measures a state of the power storage element. A measurement object that can be measured by the measurement unit; an urging unit that urges the measurement unit toward the measurement object; and a urging unit that is provided on a side opposite to the measurement unit. A regulation unit.

  According to this, since the urging unit is regulated by the first regulating member provided on the side opposite to the measuring unit of the urging unit, the urging unit can be prevented from being deformed excessively toward the opposite side. . Thereby, even if a vibration or impact is given to the power storage device, it is possible to prevent the urging portion from being damaged due to excessive deformation. For this reason, the urging unit can maintain the state in which the measurement unit is urged toward the measurement target, and the measurement unit can accurately measure the state of the storage element.

  The urging portion may include a deformable portion that is elastically deformed, and the first restricting portion may restrict elastic deformation of the deformable portion.

  According to this, since the deformation | transformation of a deformation | transformation part is controlled by the 1st control part in the range of elastic deformation, the urging | biasing part can prevent that a urging | biasing part carries out plastic deformation. Thereby, it can prevent that the urging | biasing force to the measurement part by an urging | biasing part falls.

  Further, the first restricting portion may be a heating element or a heat conductor.

  For this reason, even if the first regulating part is a heating element or a heat conductor, an urging part can be provided between the measurement part and the heating element or the heat conductor, so that the heating element or heat exerted on the measurement part can be provided. The influence of heat from the conductor can be reduced. Thereby, even if it is a heat generating body or a heat conductor, since it can utilize as a 1st control part, the structure of an electrical storage apparatus can be made compact.

  The measured object may be at least one of the power storage element, a bus bar electrically connected to an electrode terminal of the power storage element, and a housing that houses the power storage element.

  For this reason, the measurement unit can accurately measure at least one state of the power storage element, the bus bar, and the housing as the state of the power storage element.

  The measurement unit may be a temperature sensor that measures the temperature of the measurement object.

  For this reason, the measurement unit can accurately measure the temperature of the measurement object.

  Furthermore, you may provide the 2nd control part which controls the movement toward the said to-be-measured body of the said measurement part.

  For this reason, it can control that a measurement part moves to the position which does not receive energizing force from an energizing part. Thereby, it can approach to a to-be-measured body in the state which the measurement part received biasing force from the biasing part.

  Furthermore, the container further includes a container that holds the measurement part in a state in which a part of the measurement part protrudes, and the container performs the measurement when deformation of the urging part is restricted by the first restriction part. The length from the first position, which is the position of the part, to the second position, which is the position of the measuring part when the movement of the measuring part is restricted by the second restricting part, You may hold | maintain the said measurement part so that the said measurement part may become shorter than the length which protrudes from the said container when it positions.

  According to this, the maximum length that the measurement unit protrudes from the container is longer than the length that the measurement unit moves from the second position to the first position. Thereby, even if it is a time of being located in the 1st position located in the innermost part of a container, a measurement part will be in the state protruded from the container. For this reason, when a container and an electrical storage element are assembled, it can prevent that a measurement part will be in the state which does not protrude from a container. That is, since the measurement unit can be maintained so as to be exposed from the container, the state of the storage element can be accurately measured.

  The power storage device according to one embodiment of the present invention is a power storage device including a power storage element, and a measurement unit that measures a state of the power storage element and a state of the power storage element by contacting the measurement unit A measurement object that can be measured, an urging part that urges the measurement part toward the measurement object, a first restriction part that is provided on the opposite side of the measurement part of the urging part, and A container that holds the measurement unit in a state in which a part of the measurement unit protrudes, and the container is positioned at the measurement unit when deformation of the biasing unit is regulated by the first regulation unit When the measurement unit is located at the second position, the measurement unit has a length from the first position to the second position that is the position of the measurement unit when the measurement unit is in contact with the measurement target. The measurement unit is held so that is shorter than the length protruding from the container.

  According to this, the maximum length that the measurement unit protrudes from the container is longer than the length that the measurement unit moves from the second position to the first position. Thereby, even if it is a time of being located in the 1st position located in the innermost part of a container, a measurement part will be in the state protruded from the container. For this reason, when a container and an electrical storage element are assembled, it can prevent that a measurement part will be in the state which does not protrude from a container. That is, since the measurement unit can be maintained so as to be exposed from the container, the state of the storage element can be accurately measured.

  Further, the measurement unit may be in surface contact with the measured object in a state where an urging force is applied by the urging unit.

  For this reason, even if a vibration or impact is applied to the power storage device, the measurement unit can be maintained in surface contact with the measurement object. Thereby, the state of an electrical storage element can be measured accurately.

  The deformable portion may be a spring formed in a cantilever shape.

  As described above, since the deformable portion can have a simple structure, the power storage device can be easily manufactured.

  According to the power storage device of the present invention, the state of the power storage element can be accurately measured.

It is a perspective view which shows the external appearance of the electrical storage apparatus which concerns on embodiment of this invention. It is a disassembled perspective view which shows each component at the time of decomposing | disassembling the electrical storage apparatus which concerns on embodiment of this invention. It is a perspective view which shows the structure of the electrical storage unit which concerns on embodiment of this invention. It is a perspective view which shows the structure of the electrical storage unit which concerns on embodiment of this invention. It is a perspective view which shows the structure of the electrical storage element which concerns on embodiment of this invention. It is a perspective view which shows the structure of the electric equipment which concerns on embodiment of this invention. It is a disassembled perspective view which shows each component at the time of disassembling the electric equipment which concerns on embodiment of this invention. It is a perspective view which shows the positional relationship of the electrical storage unit which concerns on embodiment of this invention, and some electric devices. It is a perspective view which shows the structure of the container main body of the electric equipment which concerns on embodiment of this invention. It is sectional drawing when the assembly with which the electrical storage unit and the electric equipment were assembled was cut | disconnected by the XY plane which passes a measurement part. It is sectional drawing when the assembly in which the electrical storage unit and the electric equipment were assembled was cut | disconnected by the XZ plane which passes a measurement part. It is a figure for demonstrating that the movement of a biasing part is controlled by the positive electrode bus bar.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. The numerical values, shapes, materials, constituent elements, arrangement positions and connecting forms of the constituent elements shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements. In each drawing, dimensions and the like are not strictly illustrated.

(Embodiment)
First, the configuration of the power storage device 1 will be described.

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

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

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

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

  The exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage device 1 and is disposed outside the power storage unit 30 and the electric device 40. That is, the exterior body 10 arranges the power storage unit 30 and the electric device 40 at predetermined positions, and protects the power storage unit 30 and the electric device 40 from an impact or the like. Moreover, the exterior body 10 is comprised, for example with insulating resin, such as a polycarbonate and a polypropylene (PP), and avoids that the electrical storage unit 30 and the electric equipment 40 contact an external metal member etc.

  Here, the exterior body 10 includes a first exterior body 11 constituting a lid body of the exterior body 10 and a second exterior body 12 constituting a main body of the exterior body 10. The first exterior body 11 is a flat rectangular cover member that closes the opening of the second exterior body 12, and is provided with a positive external terminal 21 and a negative external terminal 22. The power storage device 1 charges electricity from the outside via the positive electrode external terminal 21 and the negative electrode external terminal 22, and discharges electricity to the outside. The second exterior body 12 is a bottomed rectangular cylindrical housing in which an opening is formed, and houses the power storage unit 30 and the electric device 40.

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

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

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

  Next, the configuration of the power storage unit 30 will be described in detail.

  3 and 4 are perspective views showing the configuration of the power storage unit 30 according to the embodiment of the present invention. Specifically, FIG. 3 is an exploded perspective view showing a configuration when the bus bar frame 500 and the bus bar 600 are separated from the power storage unit 30. FIG. 4 is an exploded perspective view showing each component when the components separating the bus bar frame 500 and the bus bar 600 from the power storage unit 30 are further disassembled.

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

  As shown in these drawings, the power storage unit 30 includes a plurality of power storage elements 100 (eight power storage elements 100 in the present embodiment), a plurality of spacers 200 (seven spacers 200 in the present embodiment), and A pair of clamping members 300, a plurality of restraining members 400 (four restraining members 410 to 440 in the present embodiment), a bus bar frame 500, and a plurality of bus bars 600 are provided.

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

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

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

  Spacer 200 is formed so as to cover approximately half of the front side or back side of storage element 100 (substantially half when divided into two in the Z-axis direction). That is, a recess is formed on both the front side or the back side (both sides in the Z-axis direction) of the spacer 200, and approximately half of the power storage element 100 is inserted into the recess. With such a configuration, the two spacers 200 sandwiching the power storage element 100 cover most of the power storage element 100, so that the insulating property between the power storage element 100 and another conductive member is covered by the spacer 200. Can be improved. The detailed configuration of the spacer 200 will be described later.

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

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

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

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

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

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

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

  The bus bar frame 500 is a member that can insulate the bus bar 600 from other members, protect various wirings disposed in the power storage device 1, and restrict the position of the bus bar 600. In particular, the bus bar frame 500 positions the bus bar 600 with respect to the plurality of power storage elements 100.

  Specifically, the bus bar frame 500 is placed above the plurality of power storage elements 100 (Y-axis direction plus side) and positioned with respect to the plurality of power storage elements 100. A bus bar 600 is placed on the bus bar frame 500. At this time, the protrusion of the bus bar frame 500 is inserted into the opening formed in the bus bar 600, whereby the bus bar 600 is positioned with respect to the bus bar frame 500. As a result, the bus bar 600 is positioned with respect to the plurality of power storage elements 100 and joined to the respective electrode terminals of the plurality of power storage elements 100.

  The bus bar frame 500 is formed of an insulating resin such as polycarbonate or polypropylene (PP), but may be formed of any material as long as it is an insulating member. The detailed configuration of the bus bar frame 500 and the detailed configuration in which the bus bar frame 500 positions the bus bar 600 will be described later.

  Bus bar 600 is a bus bar electrically connected to each of the plurality of power storage elements 100. That is, the bus bar 600 is a conductive member that is electrically connected to each electrode terminal included in the plurality of power storage elements 100, and any one of the electrode terminals included in the plurality of power storage elements 100 is electrically connected to each other. To do.

  The bus bar 600 is made of, for example, aluminum as a conductive member, but the material of the bus bar 600 is not particularly limited. In addition, the bus bar 600 may be formed of a member made of the same material, or one of the bus bars may be formed of a member made of a different material.

  Next, the structure of the electrical storage element 100 is demonstrated in detail.

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

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

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

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

  Here, the positive electrode is an electrode plate in which a positive electrode active material layer is formed on the surface of a long strip-like conductive positive electrode current collector foil made of aluminum or an aluminum alloy, and the negative electrode is made of copper or a copper alloy or the like. It is an electrode plate in which a negative electrode active material layer is formed on the surface of a long strip-like conductive negative electrode current collector foil, and the separator is a microporous sheet. Note that the positive electrode, the negative electrode, and the separator used for the energy storage device 100 are not particularly different from those conventionally used, and any known material can be used as long as the performance of the energy storage device 100 is not impaired. Further, the electrolyte solution (nonaqueous electrolyte) sealed in the container 110 is not particularly limited as long as it does not impair the performance of the power storage device 100, and various types can be selected.

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

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

  Next, the configuration of the electric device 40 will be described in detail.

  FIG. 6 is a perspective view showing the configuration of the electric device 40 according to the embodiment of the present invention. FIG. 7 is an exploded perspective view showing each component when the electric device 40 according to the embodiment of the present invention is disassembled. FIG. 8 is a perspective view showing a positional relationship between the power storage unit 30 and a part of the electric device 40 according to the embodiment of the present invention.

  As shown in FIGS. 6 and 7, the electric device 40 includes various components including a circuit board 730, a measurement unit 740, a positive bus bar 750, and a relay 760 inside the box-shaped electric device container 701. It is configured by being accommodated.

  The electrical device container 701 is a box-shaped member made of an insulating resin such as polycarbonate, polypropylene (PP), or polyethylene (PE), and includes a lid 710 and a container body 720. The lid 710 has a plurality of engaging portions 711 for engaging with the container main body 720 on the outer peripheral portion (specifically, both ends in the Y-axis direction and both ends in the Z-axis direction). The container body 720 has a rectangular cylindrical shape that can accommodate various components and has a bottom, and a plurality of sidewalls (specifically, sidewalls formed at both ends in the Y-axis direction and both ends in the Z-axis direction). A plurality of protrusion-like engaged portions 721 that are engaged by the engaging portion 711 are provided. The electrical device container 701 becomes a box-shaped member that accommodates various components by the plurality of engaging portions 711 of the lid portion 710 engaging with the plurality of engaged portions 721 of the container body 720, respectively.

  The circuit board 730 is connected to the positive electrode terminal 120 or the negative electrode terminal 130 of each power storage element 100 in the power storage unit 30, the measurement unit 740, and the like by wiring (lead wire). For example, the charge state or the discharge state of the power storage element 100 (Battery status such as voltage and temperature) is acquired, monitored, and controlled.

  The measurement unit 740 is a temperature sensor (thermistor) that measures the temperature of two power storage elements 100 of the power storage unit 30. The measuring unit 740 is disposed in an opening 722 formed on the bottom surface of the container body 720 on the minus side in the X-axis direction. That is, the measurement unit 740 is provided on the positive side of the power storage element 100 in the X-axis direction. Specifically, as illustrated in FIG. 8, the measurement unit 740 includes a measurement unit 741 that measures the temperature of the power storage element 100a that is secondly arranged from the Z-axis direction plus side of the power storage unit 30, and a Z-axis. And a measuring unit 742 that measures the temperature of the power storage element 100b arranged fourth from the direction plus side (see also FIGS. 3 and 4). The measurement unit 741 is disposed so as to be in surface contact with the side surface on the negative electrode side of the power storage element 100a, and the measurement unit 742 is disposed so as to be in surface contact with the side surface on the positive electrode side of the power storage element 100b. More specifically, the measurement unit 740 has a surface on the side surface exposed by the opening 223a provided in the spacer 200 among the side surfaces on the plus side in the X-axis direction of the energy storage device 100 covered with the spacer 200. It is arranged to touch. The measuring unit 740 is electrically connected to the circuit board 730 by a lead wire 743 (see FIG. 10).

  As described above, the measurement unit 740 measures the temperature of the power storage element 100b arranged near the center of the power storage unit 30 in the arrangement direction (Z-axis direction) of the plurality of power storage elements 100. It is possible to measure the temperature of the power storage element 100b in which the temperature of the element 100 is likely to increase. Moreover, since the measurement part 742 is arrange | positioned at the side surface by the side of the positive electrode of the electrical storage element 100b, it can measure the temperature in the part which temperature tends to rise among the electrical storage elements 100b. That is, the measuring unit 742 measures the temperature of the portion of the power storage unit 30 where the temperature is most likely to rise. For this reason, the temperature measured by the measuring unit 742 can be effectively used for various controls on the circuit board 730.

  The positive electrode bus bar 750 is a bus bar that is electrically connected to the relay 760 and the positive electrode terminal of the power storage unit 30 in which the plurality of power storage elements 100 are electrically connected by the bus bar 600. The positive electrode bus bar 750 is covered with an insulating member 751 made of a heat-shrinkable tube, except for a portion connected to the positive electrode terminal of the power storage unit 30 and the relay 760.

  The relay 760 is electrically connected to the positive electrode bus bar 750 and the positive electrode external terminal 21, and performs conduction and non-conduction between the positive electrode terminal of the power storage unit 30 and the positive electrode external terminal 21 in accordance with a control signal of the circuit board 730. It is a relay switch to switch.

  Next, a configuration for urging the measurement unit 740 toward the power storage element 100 will be described.

  FIG. 9 is a perspective view showing the configuration of the container body 720 of the electric device 40 according to the embodiment of the present invention. FIG. 10 is a cross-sectional view of the assembly in which the power storage unit 30 and the electric device 40 are assembled, cut along an XY plane that passes through the measurement unit 740. FIG. 11 is a cross-sectional view of the assembly in which the power storage unit 30 and the electric device 40 are assembled, cut along an XZ plane that passes through the measurement unit 740. FIG. 12 is a diagram corresponding to the enlarged view of FIG. 10, and is a diagram for explaining that the movement of the urging portion 723 is restricted by the positive electrode bus bar 750.

  As shown in these drawings, the container body 720 is formed with an opening 722 for accommodating the measuring unit 740 in a state exposed to the X axis direction minus side. The opening 722 is formed with a second restricting portion 724 that prevents the measuring portion 740 from being detached from the container body 720 to the minus side in the X-axis direction. The second restricting unit 724 restricts the movement of the measuring unit 740 toward the power storage element 100. Specifically, the second restricting portion 724 restricts the movement of the measuring portion 740 to the minus side in the X-axis direction by contacting the surface on the minus side in the X-axis direction of the flange portion 740a of the measuring portion 740. As shown in FIG. 11, the flange portion 740 a is a part of the measuring portion 740 having a shape protruding from the end portion on the minus side in the X-axis direction of the measuring portion 740 to both sides in the Z-axis direction.

  In addition, the container body 720 is formed with a biasing portion 723 that biases the measurement unit 740 toward the power storage element 100 by being deformed. That is, the urging unit 723 urges the measuring unit 740 provided on the minus side in the X axis direction of the urging unit 723 toward the minus side in the X axis direction. Specifically, the urging portion 723 includes a deforming portion 723a and a contact portion 723b. The urging portion 723 may be made of the same material as the container body 720 or may be made of another material. When the urging portion 723 is made of another material, the urging portion 723 is preferably made of a metal having a lower thermal conductivity than the first restricting portion (the positive electrode bus bar 750 in the present embodiment). That is, the urging portion 723 can be made of a material having lower thermal conductivity than the first restricting portion because it can further reduce the influence of heat from the first restricting member on the measuring portion 740. preferable. Further, the urging portion 723 may be formed integrally with the container main body, or may be formed by fixing another member.

  As shown in FIG. 10, the deformable portion 723a is a rod-shaped member extending along the Y-axis direction, and is a spring formed in a cantilever shape in which the Y-axis direction plus end is fixed to the container body 720. It is. That is, the deforming portion 723a is elastically deformed. The urging unit 723 urges the measuring unit 740 toward the minus side in the X-axis direction when the deforming unit 723a is deformed (bends) as indicated by a white arrow in the enlarged view of FIG. 10 or FIG. ing.

  The abutting portion 723b has a shape that protrudes further toward the minus side in the X-axis direction than the deformable portion 723a at the end portion on the minus side in the Y-axis direction of the deformable portion 723a. The end of the abutting portion 723b on the minus side in the X-axis direction abuts on the plus side of the measuring unit 740 in the X-axis direction.

  As described above, the measurement unit 740 is maintained in a state of being in surface contact with the power storage element 100 in a state where the urging force is applied by the urging unit 723. In addition, the measuring unit 740 is pressed by the biasing unit 723 from the X axis direction plus side, and the flange portion 740a is abutted by the second restricting unit 724 from the X axis direction minus side, whereby the container body 720 is attached. Retained.

  Further, the positive electrode bus bar 750 is disposed on the container body 720 on the positive side of the urging portion 723 in the X-axis direction. That is, the positive electrode bus bar 750 is provided on the opposite side of the urging unit 723 from the measurement unit 740, and functions as a first regulating unit that regulates deformation of the urging unit 723 toward the opposite side. Specifically, the positive electrode bus bar 750 restricts the elastic deformation of the deformable portion 723a. The positive electrode bus bar 750 is a heating element that generates heat when a current flows through the positive electrode bus bar 750.

  The enlarged view in the upper part of FIG. 12 is an enlarged view of FIG. 10 when the movement of the measuring unit 740 is regulated by the second regulating unit 724. The enlarged view of the lower part of FIG. 12 is an enlarged view of FIG. 10 when the deformation | transformation of the urging | biasing part 723 is controlled by the 1st control part (positive electrode bus bar 750).

  As shown in the figure, when the deforming portion 723a is deformed so that the abutting portion 723b moves to the X axis direction plus side, the abutting portion 723b abuts on the positive bus bar 750. Thus, the deformation of the deformation portion 723a is restricted. Here, the position of the measurement unit 740 when the deformation of the biasing unit 723 is regulated by the positive electrode bus bar 750 is the first position P1, and the movement of the measurement unit 740 is regulated by the second regulation unit 724. Consider a case where the position of the measurement unit 740 is the second position P2. In this case, the length d1 from the first position P1 to the second position P2 is shorter than the length d2 at which the measuring unit 740 protrudes from the electrical device container 701 when the measuring unit 740 is located at the second position P2. That is, the electrical device container 701 holds the measuring unit 740 so that the length d1 is shorter than the length d2. Note that the second position P2 may be a position when the measurement unit 740 is in contact with the power storage element 100 (measured body).

  As described above, according to power storage device 1 according to the embodiment of the present invention, urging unit 723 is deformed toward the side opposite to the direction in which measuring unit 740 is urged toward power storage element 100. Is restricted by the positive electrode bus bar 750, it is possible to suppress the urging portion 723 from being deformed too much toward the opposite side. As a result, even if vibration or impact is applied to the power storage device 1, it is possible to prevent the urging portion 723 from being damaged due to excessive deformation. For this reason, the urging unit 723 can be maintained in a state of urging the measuring unit 740 toward the power storage element 100. Thereby, a measurement part can measure the state of electrical storage element 100 with sufficient accuracy.

  Further, the positive electrode bus bar 750 functioning as the first restricting portion restricts elastic deformation of the deforming portion 723a of the urging portion 723. That is, the biasing portion 723 can prevent the biasing portion 723 from being plastically deformed because the deformation of the deformation portion 723a is restricted by the positive bus bar 750 within the range of elastic deformation. Thereby, it can prevent that the urging | biasing force to the measurement part 740 by the urging | biasing part 723 falls.

  In addition, the measurement unit 740 is in surface contact with the power storage element 100 in a state where the urging force is applied by the urging unit 723. For this reason, even when vibration or impact is applied to the power storage device 1, the measurement unit 740 can be maintained in surface contact with the power storage element 100. Thereby, the state of the electrical storage element 100 can be accurately measured.

  Moreover, the positive electrode bus bar 750 that functions as the first restricting portion is a heating element or a heat conductor that generates heat. For this reason, even if a 1st control part is a heat generating body or heat conductor like the positive electrode bus bar 750, the biasing part 723 can be provided between the measurement part 740 and the positive electrode bus bar 750. For this reason, the influence of the heat from the positive electrode bus bar 750 on the measuring unit 740 can be reduced. Thereby, even if it is a heat generating body or a heat conductor, since it can utilize as a 1st control part, the structure of the electrical storage apparatus 1 can be made compact.

  The measurement unit 740 is a temperature sensor that measures the temperature of the power storage element 100. For this reason, the measurement part 740 can measure the temperature of the electrical storage element 100 accurately.

  The deformable portion 723a is a spring formed in a cantilever shape. Thus, since a deformation | transformation part can be made into a simple structure, manufacture of the electrical storage apparatus 1 can be made easy.

  In addition, the power storage device 1 includes a second restriction unit 724 that restricts the movement of the measurement unit 740 toward the power storage element 100. For this reason, it can restrict | limit that the measurement part 740 moves to the position which does not receive urging | biasing force from the urging | biasing part 723. FIG. Accordingly, the measurement unit 740 can be brought closer to the power storage element 100 in a state where the urging force is received from the urging unit 723. Further, the second restricting portion 724 is formed in the electric device container 701 in which the measuring portion 740 is accommodated. For this reason, it can prevent that the measurement part 740 falls out of the electrical equipment container 701.

  In addition, the electric device container 701 holds the measuring unit 740 so that the length d1 is shorter than the length d2. Here, the length d1 is a length from the first position P1 to the second position P2. The length d2 is a length by which the measurement unit 740 protrudes from the electrical device container 701 when the measurement unit 740 is located at the second position P2. The first position P1 is the position of the measurement unit 740 when the deformation of the urging unit 723 is restricted by the positive electrode bus bar 750. The second position P2 is the position of the measurement unit 740 when the movement of the measurement unit 740 is restricted by the second restriction unit 724. That is, the maximum length by which the measurement unit 740 protrudes from the electrical device container 701 is longer than the length by which the measurement unit 740 moves from the second position P2 to the first position P1. As a result, the measuring unit 740 protrudes from the electrical device container 701 even when the measurement unit 740 is located at the first position P <b> 1 positioned in the innermost side of the electrical device container 701. For this reason, when the electric equipment container 701 and the electrical storage element 100 are assembled, it can prevent that the measurement part 740 does not protrude from the electric equipment container 701. That is, in the power storage device 1, the measurement unit 740 can be maintained so as to be exposed from the electrical device container 701, and thus the state of the power storage element 100 can be accurately measured.

  The power storage device 1 according to the embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. That is, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  For example, in the above-described embodiment, the measurement unit 740 measures the temperature of the power storage element 100 by directly contacting the power storage element 100. However, the measurement unit 740 is not limited thereto, and includes, for example, a bus bar (bus bar 600, positive bus bar 750). And the temperature of other structures such as a housing (including the exterior body 10) may be measured. That is, the measurement unit only needs to be able to measure the temperature of at least one of the power storage element, the bus bar, and the housing as long as it is a measurement target that can measure the temperature of the power storage element 100 by contacting. Note that in this case, if the relationship between the temperature of the other structure and the temperature of the power storage element 100 is known in advance, the temperature of the power storage element 100 can be estimated based on the relationship.

  Moreover, in the said embodiment, although the measurement part 740 is a temperature sensor which measures temperature as the state of the electrical storage element 100, it is not restricted to a temperature sensor. The measurement unit may be, for example, a current sensor that measures a charge / discharge state as the state of the power storage element 100 or a voltage sensor that measures the voltage of the power storage element 100. In this case, the measurement unit is provided so as to be in contact with the positive electrode terminal 120 and the negative electrode terminal 130 of the energy storage device 100.

  Moreover, in the said embodiment, although the positive electrode bus bar 750 is employ | adopted as a 1st control part, it is not restricted to this. For example, a structure as a first restricting portion may be formed on the container body 720 of the electrical device container 701, or other components such as a relay 760, a heat sink, and a fuse may be employed.

  Moreover, in the said embodiment, although the deformation | transformation part 723a is a spring formed in the shape of a cantilever, if it is a structure which gives urging | biasing force to a measurement part not only by this but by deform | transforming. For example, a spring formed in a spiral shape or a leaf spring may be used.

  Moreover, in the said embodiment, although the electrical storage apparatus 1 is the structure provided with the some electrical storage element 100, it is applicable also to the electrical storage apparatus of a structure provided with one electrical storage element.

  In addition, embodiments constructed by arbitrarily combining the constituent elements included in the above-described embodiment and its modifications are also included in the scope of the present invention.

  The present invention is useful as a power storage device including a power storage element and a measurement unit that measures the state of the power storage element.

DESCRIPTION OF SYMBOLS 1 Power storage device 10 Exterior body 11 First exterior body 12 Second exterior body 21 Positive external terminal 22 Negative external terminal 30 Electrical storage unit 40 Electrical device 100, 100a, 100b Electrical storage element 110 Container 120 Positive electrode terminal 130 Negative electrode terminal 140 Electrode body 150 Positive electrode Current collector 160 Negative electrode current collector 200 Spacer 223a Opening 300, 310, 320 Holding member 400, 410, 420, 430, 440 Restraining member 500 Bus bar frame 600 Bus bar 701 Electrical equipment container 710 Lid 711 Engagement section 720 Container body 721 engaged portion 722 opening portion 723 biasing portion 723a deforming portion 723b abutting portion 724 second restricting portion 730 circuit board 740, 741, 742 measuring portion 740a flange portion 750 positive electrode bus bar 751 insulating member 760 relay P1 first position P2 second position

Claims (6)

A power storage device including a power storage element,
A measuring unit for measuring the state of the storage element;
An object to be measured by which the measurement unit can measure the state of the power storage element by being in contact
An urging unit that urges the measurement unit toward the measurement object;
(1) Provided on the opposite side of the urging unit from the measurement unit, and restricts the urging unit from being deformed toward the opposite side , and (2) a heating element or a heat conductor. A power storage device comprising: a first restriction unit. A power storage device including a power storage element,
A measuring unit for measuring the state of the storage element;
An object to be measured by which the measurement unit can measure the state of the power storage element by being abutted;
An urging unit that urges the measurement unit toward the measurement object;
A first restricting portion that is provided on the opposite side of the urging portion from the measuring portion and restricts the urging portion from being deformed toward the opposite side ;
A second regulating unit that regulates movement of the measuring unit toward the measurement object. further,
A container for holding the measurement unit in a state in which a part of the measurement unit protrudes;
In the container, the movement of the measuring unit is regulated by the second regulating unit from the first position that is the position of the measuring unit when deformation of the urging unit is regulated by the first regulating unit. The measurement is performed so that the length to the second position, which is the position of the measurement unit, is shorter than the length of the measurement unit protruding from the container when the measurement unit is positioned at the second position. The power storage device according to claim 2. The urging portion has a deformation portion that is elastically deformed,
The power storage device according to any one of claims 1 to 3, wherein the first restricting portion restricts elastic deformation of the deforming portion. The said to-be-measured object is at least 1 of the housing | casing which accommodates the said electrical storage element, the bus bar electrically connected to the electrode terminal of the said electrical storage element, and the said electrical storage element. The power storage device described. The power storage device according to claim 1, wherein the measurement unit is a temperature sensor that measures a temperature of the measurement target.

Images