Power storage device

Abstract

To provide a highly safe electricity storage device that is equipped with a connector to which external wiring can be attached and detached. [Solution] The energy storage device (10) includes an energy storage element (20), a first wiring (65a) electrically connected to the energy storage element (20), a harness plate (50) that holds the first wiring (65a), and a first connector (85) connected to the first wiring (65a), the first connector (85) being located in the center of the harness plate (50) and allowing external wiring to be attached and detached.

Description

[Technical field]

[0001] The present invention relates to an energy storage device including an energy storage element and a wire holding member that holds wires electrically connected to the energy storage element. [Background technology]

[0002] Conventionally, there are monitoring devices that monitor the state of a power storage device that includes one or more power storage elements. For example, Patent Document 1 discloses a battery monitoring device that includes a high-voltage side connector that is electrically connected to a battery and a low-voltage side connector that is connected to a host microcontroller. In this battery monitoring device, the high-voltage side connector and the low-voltage side connector are arranged on opposing sides of a housing in a plan view. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-115647 A Summary of the Invention [Problem to be solved by the invention]

[0004] For example, a power storage device connected to an external device such as the battery monitoring device is also provided with a connector for connecting to an external wiring. Since this connector is an electrical connection point between the power storage device and the external device, when the power storage device is mounted on a moving body such as an electric vehicle (EV) for driving or starting the moving body, it is necessary to devise a way to protect it from impacts, etc. In particular, a high level of safety is required for the connector electrically connected to the power storage element of the power storage device.

[0005] Therefore, if a connector electrically connected to the energy storage element is placed at the end of a housing (the outer casing of the energy storage device), as in the conventional battery monitoring device described above, a problem may arise in that the connector is susceptible to impacts.

[0006] The present invention was made by the inventors of the present application by focusing on the above-mentioned problem, and aims to provide a highly safe energy storage device that has a connector to which external wiring can be attached and detached. [Means for solving the problem]

[0007] In order to achieve the above object, a power storage device according to one embodiment of the present invention includes: The power storage device according to one aspect of the present invention includes an electric storage element, a first wiring electrically connected to the electric storage element, a flat rectangular wiring holding member that holds the first wiring, a first connector connected to the first wiring, the first connector being attached to the wiring holding member and allowing external wiring to be attached and detached, and an inner lid that is disposed between the electric storage element and the wiring holding member, the inner lid holding the wiring holding member and holding the electric storage element. The power storage device includes: a power storage element; a first wiring electrically connected to the power storage element; a wiring holding member that holds the first wiring; and a first connector that is connected to the first wiring, the first connector being located in a central portion of the wiring holding member and to which an external wiring can be attached and detached. It may also be .

[0008] According to this configuration, the first wiring electrically connected to the energy storage element is provided in the energy storage device in a state where it is held by the wiring holding member. Therefore, for example, when manufacturing (assembling) the energy storage device, the first wiring can be incorporated into the energy storage device in a state where it is held by the wiring holding member. This makes it difficult for the first wiring to be pinched between members, for example. In addition, compared to a case where the first wiring has a high degree of freedom of movement, for example, the possibility of occurrence of defects such as disconnection of the first wiring is reduced. Furthermore, since the first connector is located at the center of the wiring holding member, the possibility of damage to the first connector in a state of electrical conduction with the energy storage element is reduced, for example, when a moving body on which the energy storage device is mounted has a collision accident. In other words, the occurrence of unsafe events such as external short circuits due to damage to the first connector is suppressed. In this way, the energy storage device according to this embodiment is a highly safe energy storage device that is provided with a connector to which the external wiring can be detached.

[0009] In addition, the energy storage device according to one embodiment of the present invention may further include a second wiring, which is a wiring for a lower voltage than the first wiring, held by the wiring holding member, and a second connector connected to the second wiring and located at an end of the wiring holding member.

[0010] According to this configuration, as described above, in an energy storage device in which the possibility of damage to the first high-voltage connector is reduced in the event of, for example, a collision accident, ease of attachment and detachment of external wiring to the second low-voltage connector at the end of the wiring holding member is ensured.

[0011] Here, if an excessive external force is applied to the connector due to a collision between a moving body equipped with the power storage device and an object, or due to forcibly attaching or detaching external wiring to or from the connector, the connector may be damaged. If the connector is damaged, it may be impossible to properly check the state of the power storage device, or a safety problem such as an external short circuit may occur.

[0012] Therefore, in the electricity storage device according to the present embodiment, the first connector to which a relatively high voltage is applied is less susceptible to damage in an emergency such as a collision accident, and the second connector to which a relatively low voltage is applied is less susceptible to damage when the external wiring is attached or detached (at least one of when the external wiring is attached and detached). This provides a highly safe electricity storage device.

[0013] In addition, in an energy storage device according to one embodiment of the present invention, the wiring holding member may have a regulating portion that regulating the first wiring and the second wiring to a position aligned within a first region in a direction intersecting the alignment direction of the energy storage element and the wiring holding member.

[0014] According to this configuration, for example, when the wiring holding member is disposed on the energy storage element, the first wiring and the second wiring do not overlap each other vertically at least in the first region, so that an increase in the vertical size is suppressed. Also, when a cover or the like is disposed to cover the wiring holding member, the possibility of the first wiring or the second wiring being broken due to pressure from the cover is reduced.

[0015] In addition, the energy storage device according to one embodiment of the present invention may further include a cover member covering the wiring holding member from the opposite side to the energy storage element, and the cover member may have a lower surface portion formed opposite the first region and forming an outer surface closer to the wiring holding member than other portions.

[0016] According to this configuration, the space formed by the bottom surface portion, which is, for example, the recessed portion, of the cover member can be used to arrange external wiring or electrical equipment such as a control board, etc. In other words, the safety of the power storage device is ensured while the space around the power storage device is effectively utilized.

[0017] In addition, in the energy storage device according to one aspect of the present invention, the first wiring and the second wiring may be arranged to bypass a second region on an opening side of the first connector.

[0018] According to this configuration, the ease of attachment and detachment of the external wiring to and from the first connector disposed at the center of the wiring holding member is ensured, thereby reducing the possibility of damage to the first connector when the external wiring is attached to or detached from the first connector.

[0019] In the energy storage device according to the aspect of the present invention, the wiring retaining member may have a wall portion extending upright along at least a part of a periphery of the second region.

[0020] According to this configuration, the presence of the wall portion makes it possible to forcibly position the first wiring and the second wiring outside the second region when or after the first wiring and the second wiring are arranged on the wiring holding member, thereby making it possible to more reliably attach and detach the external wiring to and from the first connector, for example.

[0021] The present invention can be realized not only as an electricity storage device, but also as a wiring holding member included in the electricity storage device. Effect of the Invention

[0022] According to the present invention, it is possible to provide a highly safe electricity storage device that is equipped with a connector to which external wiring can be detached. [Brief description of the drawings]

[0023] [Figure 1] 1 is a perspective view showing an external appearance of a power storage device according to an embodiment; [Diagram 2] 1 is a first exploded perspective view illustrating components of a power storage device according to an embodiment when the device is disassembled. FIG. [Diagram 3] 4 is a second exploded perspective view illustrating components of the electricity storage device according to the embodiment when disassembled. FIG. [Figure 4A] FIG. 4 is a plan view showing a layout of a first wiring according to the embodiment. [Figure 4B] FIG. 4 is a plan view showing a layout of second wiring in the embodiment. [Diagram 5] FIG. 2 is an enlarged perspective view of a portion of the harness plate according to the embodiment. [Figure 6] 1 is a plan view showing a first configuration example of a battery pack according to an embodiment. [Figure 7] FIG. 4 is a plan view showing a second configuration example of a battery pack according to an embodiment. [Figure 8] FIG. 11 is a cross-sectional view showing a configuration around a lid of an electricity storage device according to a modified example of the embodiment. [Figure 9] FIG. 13 is a plan view showing a configuration of an electricity storage device according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, a description will be given of an energy storage device according to an embodiment of the present invention with reference to the drawings. Note that the embodiment described below is a comprehensive or specific example. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiment are merely examples and are not intended to limit the present invention. Furthermore, among the components in the following embodiment, components that are not described in an independent claim showing the highest concept are described as optional components. Also, in each figure, dimensions, etc. are not strictly illustrated.

[0025] In the following description and drawings, the X-axis direction is defined as the arrangement direction of the electrode terminals of one energy storage element, the opposing direction of the short side surfaces of the container of the energy storage element, or the opposing direction of the long side surfaces of the exterior body of the energy storage device. The Y-axis direction is defined as the arrangement direction of the multiple energy storage elements, the opposing direction of the long side surfaces of the container of the energy storage element, the thickness direction of the container, or the opposing direction of the short side surfaces of the exterior body of the energy storage device. The Z-axis direction is defined as the arrangement direction of the exterior body main body, the energy storage element, the inner lid, the harness plate, and the lid body of the energy storage device, the arrangement direction of the container main body and the lid body of the energy storage element, or the up-down direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect with each other (orthogonal in this embodiment). Note that, depending on the mode of use, it is possible that the Z-axis direction is not the up-down direction, but for convenience of explanation, the Z-axis direction will be described as the up-down direction. In the following description, for example, the positive side of the X-axis direction refers to the side of the arrow on the X-axis, and the negative side of the X-axis direction refers to the opposite side to the positive side of the X-axis direction. The same applies to the Y-axis and Z-axis directions.

[0026] (Embodiment) First, a configuration of an energy storage device 10 according to an embodiment will be described. FIG. 1 is a perspective view showing the appearance of the energy storage device 10 according to the embodiment. FIG. 2 is a first exploded perspective view showing each component when the energy storage device 10 according to the embodiment is disassembled. FIG. 3 is a second exploded perspective view showing each component when the energy storage device 10 according to the embodiment is disassembled. Note that in FIG. 3, in order to clearly show the relationship between the harness plate 50 and members fixed to the harness plate 50, the exterior body 11 and the inner lid 30 are omitted from the illustration.

[0027] The power storage device 10 is a device that can be charged with electricity from an external source and can discharge electricity to the outside. For example, the power storage device 10 is a battery module used for power storage purposes, power supply purposes, and the like. Specifically, the power storage device 10 is used as a battery for driving or starting the engine of a mobile object such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV), a motorcycle, a watercraft, a snowmobile, an agricultural machine, or a construction machine.

[0028] As shown in Figures 1 and 2, the energy storage device 10 includes an exterior body 11 consisting of a lid body 100 and an exterior body main body 200, and a plurality of energy storage elements 20, an inner lid 30, a plurality of bus bars 40, a harness plate 50, internal wiring 65, etc., which are housed inside the exterior body 11.

[0029] The exterior body 11 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the energy storage device 10. In other words, the exterior body 11 is disposed outside the energy storage elements 20 and the harness plate 50, etc., and places the energy storage elements 20, etc. in predetermined positions to protect them from impacts, etc. The exterior body 11 is made of an insulating material such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polybutylene terephthalate (PBT), or ABS resin. The exterior body 11 thereby prevents the energy storage elements 20, etc. from coming into contact with metal members, etc.

[0030] The exterior body 11 has a flat rectangular lid body 100 constituting a lid body (outer lid) of the exterior body 11, and an exterior body main body 200 constituting a main body of the exterior body 11. The lid body 100 is an example of a cover member that covers the harness plate 50 from the side opposite to the energy storage element 20. The exterior body main body 200 is a rectangular cylindrical housing with a bottom and an opening formed therein. In other words, the lid body 100 is disposed so as to close the opening of the exterior body main body 200. The lid body 100 and the exterior body main body 200 may be formed of members made of the same material, or may be formed of members made of different materials.

[0031] In addition, an opening 100a which is a rectangular through-hole is formed in the center of the lid 100, and an opening 100b which is a rectangular notch is formed in the corners of the lid 100 on the positive side in the X-axis direction and on both sides in the Y-axis direction. An opening 100c which is a rectangular notch is further formed in the lid 100 at the center in the X-axis direction and on the negative side in the Y-axis direction. In addition, a bottom surface portion 105 which forms an outer surface closer to the harness plate 50 than other portions is formed in the lid 100.

[0032] The energy storage element 20 is a secondary battery (single cell) capable of charging and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The energy storage element 20 has a flattened rectangular parallelepiped (square) shape, and in this embodiment, eight energy storage elements 20 (energy storage elements 20A to 20H) are arranged in the Y-axis direction. The shape of the energy storage element 20 and the number of the arranged energy storage elements 20 are not limited. Furthermore, the energy storage element 20 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, a capacitor, or a primary battery that allows the user to use stored electricity without charging it.

[0033] Specifically, the energy storage element 20 includes a metal container 21, and a positive electrode terminal 22 and a negative electrode terminal 23, which are metal electrode terminals, are provided on the lid of the container 21. The lid of the container 21 may be provided with a liquid injection section for injecting an electrolyte solution, and a gas exhaust valve for discharging gas to release pressure when the pressure inside the container 21 increases. Furthermore, electrodes (also referred to as electricity storage elements or power generation elements), current collectors (positive electrode current collector and negative electrode current collector), and the like are arranged inside the container 21, and an electrolyte solution (nonaqueous electrolyte) and the like are sealed therein, but detailed description thereof will be omitted.

[0034] In this embodiment, the positive electrode terminal 22 and the negative electrode terminal 23 are bolt terminals having a bolt portion with a thread formed thereon, which are disposed protruding from the lid portion of the container 21 toward the lid body 100 (upward, i.e., toward the positive side in the Z-axis direction). The negative electrode terminal 23 of the energy storage element 20A and the positive electrode terminal 22 of the energy storage element 20H, which are the outermost electrode terminals of the multiple energy storage elements 20, are disposed exposed from an opening 100b formed on the positive side in the X-axis direction and on both corners of the lid body 100 in the Y-axis direction. The outermost electrode terminals are connected to an external terminal (not shown) or function as external terminals, so that the energy storage device 10 can charge with electricity from the outside and discharge electricity to the outside.

[0035] The inner lid 30 is a flat rectangular member constituting the inner lid of the exterior body 11, and has a function of reinforcing the exterior body main body 200. The inner lid 30 is disposed between the harness plate 50 and the energy storage element 20, and holds the harness plate 50 from below and holds the energy storage element 20 from above. The inner lid 30 is made of an insulating material such as PC, PP, PE, PPS, PBT, or ABS resin. An opening 31 is formed in the inner lid 30 at the corners on the positive side in the X-axis direction and on both sides in the Y-axis direction. A thermistor 63 and a detection terminal 80, which will be described later, are disposed in the opening 31.

[0036] The bus bar 40 is a rectangular plate-like member disposed on the plurality of energy storage elements 20 (on the inner lid 30) and electrically connects the electrode terminals of the plurality of energy storage elements 20 to each other. The bus bar 40 is formed of a conductive member made of metal such as copper, a copper alloy, aluminum, or an aluminum alloy. Specifically, a through hole is formed in the bus bar 40, and a bolt portion of the electrode terminal of the energy storage element 20 is inserted into the through hole, and a nut 90 (see FIG. 3) is fastened to the bolt portion, thereby connecting the bus bar 40 to the electrode terminal. In this embodiment, the bus bar 40 connects the positive electrode terminal 22 of one of two adjacent energy storage elements 20 to the negative electrode terminal 23 of the other. As a result, the eight energy storage elements 20 are connected in series. Note that the manner of connection of the energy storage elements 20 is not limited to the above, and any combination of series connection and parallel connection may be used.

[0037] Moreover, in this embodiment, detection terminals 80, which are terminals for detecting voltage, are arranged in contact with each of the multiple bus bars 40. Specifically, detection terminals 80 are arranged on the upper surfaces of bus bars 40, and bus bars 40 and detection terminals 80 are fastened together by nuts 90. In other words, nuts 90 that fix bus bars 40 to electrode terminals of energy storage elements 20 fix detection terminals 80 in a state of contact with bus bars 40.

[0038] As described above, thermistors 63 are disposed at detection terminals 80 arranged on negative terminal 23 of energy storage element 20A and positive terminal 22 of energy storage element 20H, which are the outermost electrode terminals of the multiple energy storage elements 20. In other words, the thermistors 63 measure the temperatures of positive terminal 22 of energy storage element 20H, which is the overall positive terminal of the energy storage element unit made up of energy storage elements 20A to 20H connected in series in this embodiment, and negative terminal 23 of energy storage element 20A, which is the overall negative terminal of the energy storage element unit.

[0039] The harness plate 50 is an example of a wiring holding member, and is a flat rectangular member on which electrical components such as the internal wiring 65, the first connector 85, and the second connector 86 are arranged. The harness plate 50 is arranged between the energy storage device 20 and the lid 100.

[0040] The harness plate 50 is made of an insulating material such as PC, PP, PE, PPS, PBT, or ABS resin. That is, the harness plate 50 is placed on the inner lid 30, holds the internal wiring 65, the first connector 85, the second connector 86, etc., insulates the internal wiring 65 etc. from other members, and regulates the position of the internal wiring 65 etc.

[0041] The internal wiring 65 has a first wiring 65a that electrically connects each electrode terminal of the energy storage element 20 to the first connector 85, and a second wiring 65b that electrically connects the two thermistors 63 to the second connector 86, and is attached to the harness plate 50. The internal wiring 65 is held in the harness plate 50 by being hooked, for example, on a first restricting portion 51 that is a claw-shaped portion provided on the harness plate 50. The details of the attachment structure of the internal wiring 65 to the harness plate 50 will be described later with reference to FIG.

[0042] In this embodiment, the first connector 85 is a connector having multiple pins in a connection port 85a, and the second connector 86 is a connector having multiple pins in a connection port 86a. That is, a connector having multiple pin holes provided at an end of an external wiring is inserted into each of the connection port 85a of the first connector 85 and the connection port 86a of the second connector 86.

[0043] The first connector 85 is attached to the harness plate 50 with its rear end supported by the first connector support portion 55a of the harness plate 50. The second connector 86 is attached to the harness plate 50 with its rear end supported by the second connector support portion 55b of the harness plate 50. Each of the first connector 85 and the second connector 86 has its rear end opposite the connection port (85a or 85b) supported by the connector support portion (55a or 55b), thereby preventing the first connector 85 and the second connector 86 from floating up.

[0044] The first wiring 65a and the second wiring 65b will be described with reference to FIG. 3, as well as FIG. 4A and FIG. 4B. FIG. 4A is a plan view showing the layout of the first wiring 65a according to the embodiment, and FIG. 4B is a plan view showing the layout of the second wiring 65b according to the embodiment. In order to easily view the layout of the first wiring 65a and the second wiring 65b, a dashed line is drawn on the first wiring 65a in FIG. 4A, and a dashed line is drawn on the second wiring 65b in FIG. 4B. In addition, in order to easily view the positions of the detection terminal 80 and thermistor 63, the detection terminal 80 is drawn with diagonal lines in FIG. 4A, and the thermistor 63 is drawn with a dot in FIG. 4B.

[0045] The first wiring 65a is a wiring for a relatively high voltage that is electrically connected to each of the multiple energy storage elements 20. Specifically, as shown in Fig. 3 and Fig. 4A, the first wiring 65a is a wiring that connects nine detection terminals 80 (80a to 80i) and a first connector 85. As shown in Fig. 3 and Fig. 4B, the second wiring 65b is a wiring that connects two thermistors 63 and a second connector 86. In other words, the second wiring 65b is a wiring through which a current for temperature detection flows, that is, a wiring for a lower voltage than the first wiring 65a.

[0046] 4A and 4B, the first connector 85 is disposed in the center of the harness plate 50, and the second connector 86 is disposed at an end of the harness plate 50. External wiring is detachably connected to each of the first connector 85 and the second connector 86. For example, a control device that controls the energy storage device 10 can measure the voltage of each energy storage element 20 of the energy storage device 10 and the temperature of the energy storage device 10 via the first connector 85, the second connector 86, and the external wiring connected to each of these connectors.

[0047] In this embodiment, of the nine detection terminals 80, the two outermost detection terminals 80, detection terminals 80a and 80i, are each connected to an electrode terminal of the energy storage element 20. Specifically, the detection terminal 80a is connected to the negative electrode terminal 23 of the energy storage element 20A, and the detection terminal 80i is connected to the positive electrode terminal 22 of the energy storage element 20H. Each of the detection terminals 80a and 80i is fixed to the electrode terminal by a nut not shown in FIG. 3 etc.

[0048] 3 and 4A, each of the detection terminals 80b to 80h is connected to a bus bar 40. Specifically, each of the detection terminals 80b to 80h is fixed in contact with one bus bar 40 by the nut 90 as described above. One bus bar 40 is connected to one positive electrode terminal 22 and the other negative electrode terminal 23 of two adjacent energy storage elements 20. That is, each of the detection terminals 80b to 80h is electrically connected to one positive electrode terminal 22 and the other negative electrode terminal 23 of the corresponding two energy storage elements 20. For example, the detection terminal 80b is electrically connected to the positive electrode terminal 22 of the energy storage element 20A and the negative electrode terminal 23 of the energy storage element 20B.

[0049] With the above configuration, the control device connected to the first connector 85 can measure, for example, the voltage of one of the energy storage elements 20 by measuring the potential difference between the two detection terminals 80. For example, the voltage of the energy storage element 20B is measured by measuring the potential difference between the detection terminals 80b and 80c.

[0050] The first wiring 65a can also be used as wiring for equalizing the voltages of the energy storage elements 20. For example, when the voltage of the energy storage element 20B is higher than the voltages of the other energy storage elements 20, the control device connected to the first connector 85 can discharge the energy storage element 20B by connecting the detection terminal 80b and the detection terminal 80c via a discharging circuit (balancing circuit). This reduces the voltage of the energy storage element 20B. In other words, the voltages of the multiple energy storage elements 20 are equalized.

[0051] 4B, a thermistor 63 is attached to each of the detection terminals 80a and 80i, and the two thermistors 63 are connected to the second connector 86 via second wiring 65b. Specifically, a pair of electric wires is connected to each of the two thermistors 63 as the second wiring 65b. The control device connected to the second connector 86 can measure the resistance value of thermistor 63 via the pair of electric wires, thereby measuring the temperature of the electricity storage device 10 thermally connected to the thermistor 63.

[0052] As described above, the energy storage device 10 of this embodiment includes the energy storage element 20, the first wiring 65a electrically connected to the energy storage element 20, the harness plate 50 that holds the first wiring 65a, and the first connector 85 connected to the first wiring 65a, the first connector 85 being located in the center of the harness plate 50 and allowing external wiring to be attached and detached.

[0053] According to this configuration, the first wiring 65a electrically connected to the energy storage element 20 is provided in the energy storage device 10 in a state of being held by the harness plate 50. Therefore, for example, during manufacturing (assembly) of the energy storage device 10, the first wiring 65a can be incorporated into the energy storage device 10 in a state of being held by the harness plate 50. This makes it difficult for the first wiring 65a to be pinched between members, for example. Also, compared to a case in which the first wiring 65a has a high degree of freedom of movement, for example, the possibility of occurrence of defects such as disconnection of the first wiring 65a or disconnection of the connection portion between the first wiring 65a and the detection terminal 80 is reduced. Furthermore, since the first connector 85 is located in the center of the harness plate 50, the possibility of damage to the first connector 85 in a state of electrical conduction with the energy storage element 20 is reduced, for example, when a moving body on which the energy storage device 10 is mounted has a collision accident. In other words, the occurrence of unsafe events such as an external short circuit caused by damage to the first connector 85 is suppressed.

[0054] Here, it is assumed that the energy storage device 10 is disposed in an automobile such as an EV or a PHEV with the harness plate 50 positioned above the plurality of energy storage elements 20, that is, with the positive side in the Z-axis direction in this embodiment facing upward. In this case, for example, when a traveling automobile collides with an object, the energy storage device 10 is subjected to an impact mainly from the side (a direction parallel to the XY plane). Under this condition, a part of the harness plate 50 is always present on the side of the first connector 85 located at the center of the harness plate 50 in a plan view (when viewed from the arrangement direction of the harness plate 50 and the plurality of energy storage elements 20). Therefore, for example, a part of the harness plate 50 that is located around the first connector 85 functions as a buffer member that absorbs the impact. As a result, the impact given to the first connector 85 is suppressed. In other words, it can be said that the first connector 85 is disposed at a position on the harness plate 50 that is unlikely to receive an impact caused by a collision accident or the like.

[0055] Thus, the power storage device 10 according to the present embodiment is provided with the first connector 85 to which external wiring can be detached, and is therefore a highly safe power storage device 10.

[0056] 1, for example, an opening 100a is provided in the center of the cover 100 that covers the harness plate 50. Therefore, even when the cover 100 is disposed above the harness plate 50, the connection port 85a of the first connector 85 (the opening through which the end of the external wiring is inserted and removed) is exposed from the opening 100a. Therefore, the external wiring can be attached to and removed from the first connector 85.

[0057] In the present embodiment, the harness plate 50 is disposed between the positive electrode terminal 22 and the negative electrode terminal 23 of each of the multiple (eight in the present embodiment) energy storage elements 20. That is, the harness plate 50 is disposed by utilizing the space between the positive electrode terminal 22 and the negative electrode terminal 23 provided to protrude from the container 21 of the energy storage element 20.

[0058] That is, the harness plate 50 is located at the center of the power storage device 10, for example, in the arrangement direction (X-axis direction) of the positive electrode terminal 22 and the negative electrode terminal 23. Therefore, for example, when an impact is applied to the power storage device 10 from the side in the X-axis direction, the effect of the impact on the harness plate 50 is reduced. As a result, for example, the first connector 85 is more reliably protected against the impact.

[0059] In this embodiment, the length of harness plate 50 in the arrangement direction (Y-axis direction) of multiple energy storage elements 20 is approximately the same as the width in the Y-axis direction of an energy storage element unit composed of multiple energy storage elements 20 (see FIG. 4A, for example). Therefore, it can also be said that first connector 85 is located at the center of energy storage device 10, and second connector 86 is located at an end of energy storage device 10 in a plan view.

[0060] Moreover, the energy storage device 10 in this embodiment includes a second wiring 65b, which is a wiring for a lower voltage than the first wiring 65a, and is held by the harness plate 50, and a second connector 86 connected to the second wiring 65b and located at an end of the harness plate 50.

[0061] According to this configuration, as described above, in the energy storage device 10 in which the possibility of damage to the high-voltage first connector 85 in the event of, for example, a collision accident, is reduced, the ease of attaching and detaching external wiring to the low-voltage second connector 86 at the end of the harness plate 50 is ensured.

[0062] Here, if an excessive external force is applied to the connector due to a collision between a moving body on which the power storage device 10 is mounted and an object, or due to forcibly attaching or detaching external wiring to or from the connector, the connector may be damaged. If the connector is damaged, it may be impossible to properly check the state of the power storage device 10, or a safety problem such as an external short circuit may occur.

[0063] Therefore, in the electricity storage device 10 according to this embodiment, the first connector 85 to which a relatively high voltage is applied is designed to reduce the possibility of damage in an emergency such as a collision accident. Furthermore, the second connector 86 to which a relatively low voltage is applied is designed to ensure ease of attachment and detachment of external wiring, thereby reducing the possibility of damage to the second connector 86 when the external wiring is attached or detached. This provides a safe electricity storage device.

[0064] Moreover, the harness plate 50 according to the present embodiment has a structure for regulating the position of the internal wiring 65, which tends to become complicated. This structure will be described with reference to FIG. 5 in addition to the above-mentioned FIG. 4A and FIG. 4B.

[0065] Fig. 5 is an enlarged perspective view showing a part of the harness plate 50 according to the embodiment. Specifically, Fig. 5 shows an enlarged view of a part of the harness plate 50 in front of the first connector 85 (the connection port 85a side).

[0066] As shown in FIG. 5, the harness plate 50 of this embodiment has regulating portions (51, 52) that regulating the first wiring 65a and the second wiring 65b to a position aligned in a direction intersecting the alignment direction (Z-axis direction) of the energy storage element 20 and the harness plate 50 within the first region 56a (see FIG. 4A and FIG. 4B).

[0067] Specifically, as the restricting portion according to the present embodiment, a first restricting portion 51 which is a claw-shaped portion and a second restricting portion 52 which is a protrusion-shaped portion are provided on the harness plate 50. Each of the multiple first restricting portions 51 hooks and holds the first wiring 65a or the second wiring 65b. In addition, a set of the second restricting portions 52 among the multiple second restricting portions 52 holds the first wiring 65a or the second wiring 65b by sandwiching them. Each of the first wiring 65a and the second wiring 65b is restricted by at least one of the first restricting portion 51 and the second restricting portion 52 to a position aligned in a direction (direction along the XY plane) along the upper surface of the harness plate 50 (one surface of the internal wiring 65). As a result, in the first region 56a of the harness plate 50, the first wirings 65a do not overlap each other vertically, the second wirings 65b do not overlap each other vertically, and the first wiring 65a and the second wiring 65b do not overlap each other vertically.

[0068] In this way, according to the harness plate 50 of the present embodiment, the first wiring 65a and the second wiring 65b do not overlap each other vertically at least in the first region 56a, so that an increase in the size in the vertical direction is suppressed. Specifically, according to the harness plate 50 of the present embodiment, the first wiring 65a and the second wiring 65b can be held in a manner that utilizes the space between the multiple energy storage elements 20 and the lid body 100 and does not waste the space. More specifically, as described above, the harness plate 50 is disposed in the space between the positive electrode terminal 22 and the negative electrode terminal 23. Therefore, an increase in the size of the energy storage device 10 due to the presence of the harness plate 50 in the energy storage device 10 is suppressed.

[0069] Furthermore, even if the cover 100 (see FIGS. 1 and 2) is disposed above the harness plate 50, the possibility of the first wiring 65a or the second wiring 65b being broken due to pressure from the cover 100 is reduced. This contributes to improving the safety of the power storage device 10.

[0070] In this embodiment, the heights of the first and second restricting portions 51 and 52 (heights from the arrangement surface 50a of the harness plate 50 on which the internal wiring 65 is arranged) are the same (including approximately the same). In addition, the bottom surface 105 of the lid body 100 facing the first region 56a is located at a height position at which it abuts against the first and second restricting portions 51 and 52. Therefore, the first and second restricting portions 51 and 52 also function as supports to prevent the lid body 100 (bottom surface portion 105) from pressing against the first wiring 65a and the second wiring 65b.

[0071] In the present embodiment, each of the first wiring 65a and the second wiring 65b (more specifically, each of the multiple electric wires constituting the first wiring 65a and the second wiring 65b) has a portion (covered portion) between both ends held by a restricting portion (at least one of the first restricting portion 51 and the second restricting portion 52) of the harness plate 50. Therefore, the attitude or position of each of the first wiring 65a and the second wiring 65b, which are flexible, inside the exterior body 11 can be stably maintained.

[0072] Also, as shown in Figures 4A, 4B, and 5, in the harness plate 50 of this embodiment, the first wiring 65a and the second wiring 65b are arranged to bypass the second region 56b on the opening (connection port 85a) side of the first connector 85.

[0073] The second region 56b is a region on the side of the first connector 85 in a plan view, and is a region on the side where the connection port 85a is provided. For example, the size and shape of the second region 56b are determined by the size and shape of a connector provided at an end of an external wiring to be inserted into the connection port 85a.

[0074] According to this configuration, for example, ease of attachment and detachment of external wiring is ensured also for the first connector 85 disposed in the center of the harness plate 50. Therefore, for example, the possibility of damaging the first connector 85 when attaching and detaching external wiring to and from the first connector 85 is reduced. In other words, for example, the possibility of performing an operation that applies unnecessary stress to the first connector 85, such as inserting external wiring from an oblique direction into the connection port 85a due to a lack of space in front of the connection port 85a of the first connector 85, is reduced.

[0075] In the present embodiment, the connection port 85a of the first connector 85 opens in a direction along the arrangement surface 50a of the harness plate 50, on which the internal wiring 65 is arranged. That is, when the external wiring is inserted into the connection port 85a of the first connector 85, the external wiring protrudes from the first connector 85 in a direction along the arrangement surface 50a. Therefore, for example, the external wiring can be connected to the first connector 85 in a position in which the external wiring does not protrude from the power storage device 10. This can reduce the possibility of damage to the external wiring or the first connector 85 due to an external force being applied to the external wiring, for example.

[0076] Further, the harness plate 50 has a wall portion 54 erected along at least a part of the periphery of the second region 56b. In this manner, the presence of the wall portion 54 in the harness plate 50 makes it possible to forcibly position the first wiring 65a and the second wiring 65b outside the second region 56b when or after the first wiring 65a and the second wiring 65b are arranged on the harness plate 50. This makes it possible, for example, to more reliably attach and detach the external wiring to and from the first connector 85. This further reduces the possibility of damage to the first connector 85 when the external wiring is attached and detached to and from the first connector 85.

[0077] In this embodiment, the wall portion 54 is disposed so as to surround the second region 56b in the harness plate 50. This allows the first wiring 65a and the second wiring 65b to be substantially completely removed from the second region 56b. In addition, for example, when an operator attaches or detaches an external wiring to or from the first connector 85 after the lid body 100 is placed, the operator's fingers are prevented from touching the first wiring 65a or the second wiring 65b. In other words, safety is improved when attaching or detaching an external wiring to or from the first connector 85.

[0078] Here, it is possible to configure one battery pack by combining a plurality of power storage devices 10 according to this embodiment. Therefore, the battery pack 1 according to this embodiment will be described with reference to Figs. 6 and 7.

[0079] Fig. 6 is a plan view showing a first configuration example of the battery pack 1 according to the embodiment, and Fig. 7 is a plan view showing a second configuration example of the battery pack 1 according to the embodiment. In Fig. 7, the external wiring is typically represented by thick lines.

[0080] As described above, the lid 100 included in the electricity storage device 10 according to this embodiment has the bottom surface portion 105 formed therein, which forms an outer surface closer to the harness plate 50 than other portions. The bottom surface portion 105 is located at a position facing the first region 56a (see FIGS. 4A and 4B) of the harness plate 50.

[0081] That is, as explained using FIG. 5, in the first region 56a, the first wiring 65a and the second wiring 65b are arranged so as not to overlap in the vertical direction, and therefore it is possible to form the lower surface portion 105 at a position opposite the first region 56a.

[0082] In this embodiment, the bottom surface portion 105 is provided as a recessed portion in the lid body 100 between the protruding portion 101 and the protruding portion 102, and this recessed portion can be used to arrange external wiring as shown in FIG. 6.

[0083] 6 includes three power storage devices 10, that is, a first power storage device 10A, a second power storage device 10B, and a third power storage device 10C, and three conductive members 12, that is, a first conductive member 12A, a second conductive member 12B, and a third conductive member 12C. The first conductive member 12A is an external wiring (external harness) connected to the first power storage device 10A. Similarly, the second conductive member 12B and the third conductive member 12C are external wiring (external harness) connected to the second power storage device 10B and the third power storage device 10C.

[0084] The first conductive member 12A is connected to the first connector 85 of the first power storage device 10A, the second conductive member 12B is connected to the first connector 85 of the second power storage device 10B, and the third conductive member 12C is connected to the first connector 85 of the third power storage device 10C. In this case, the first conductive member 12A is disposed on the lower surface 105 of the first power storage device 10A, and the second conductive member 12B is disposed on the lower surface 105 of the first power storage device 10A and the lower surface 105 of the second power storage device 10B. Similarly, the third conductive member 12C is disposed on the lower surface 105 of the first power storage device 10A, the lower surface 105 of the second power storage device 10B, and the lower surface 105 of the third power storage device 10C.

[0085] Each power storage device 10 is provided with, for example, a harness cover 210 (the outline of which is shown by a dashed line in FIG. 6) that covers the conductive member 12. The harness cover 210 provides a flush connection between, for example, the protrusions 101 and 102.

[0086] In this manner, when the power storage devices 10 according to this embodiment are arranged so that the bottom surfaces 105 of the power storage devices 10 are aligned, a passage for one or more external wirings is formed by the bottom surfaces 105 of the power storage devices 10. By arranging one or more external wirings in this passage, the battery pack 1 can be configured without increasing the size in the height direction (Z-axis direction).

[0087] In addition, the first connectors 85 of each of the multiple power storage devices 10 provided in the battery pack 1 are located inside the ends of the battery pack 1 in a planar view, so that the first connectors 85 are unlikely to be damaged even if a moving body equipped with the battery pack 1 is involved in a collision accident or the like.

[0088] Furthermore, when a power storage device row configured by arranging a plurality of power storage devices 10 in the X-axis direction in this manner is arranged in the Y-axis direction, the power storage device rows can be disposed close to each other as shown in FIG.

[0089] Specifically, in the power storage device 10 according to the present embodiment, the first connector 85 is disposed in the center in a plan view, and the second connector 86 is disposed at an end. Therefore, for example, when two power storage devices 10 are arranged in the arrangement direction (Y-axis direction) of the first connector 85 and the second connector 86, the two power storage devices 10 are arranged so that the second connectors 86 of each of the two power storage devices 10 face in opposite directions.

[0090] 7, when a power storage device array including a first power storage device 10A and a second power storage device 10B and a power storage device array including a fourth power storage device 10D and a fifth power storage device 10E are arranged side by side, the two power storage device arrays are arranged so that the second connectors 86 in each power storage device array face outward. This makes it possible to arrange the two power storage device arrays close to each other, and also ensures that the external wiring (conductive member 13) can be easily attached to and detached from the second connectors 86.

[0091] There is no particular limit to the number of power storage devices 10 included in the battery pack 1. For example, the number of power storage devices 10 may be determined according to the specifications of a mobile object in which the battery pack 1 is mounted. Although not shown in Figs. 6 and 7, the battery pack 1 may include a housing that houses the multiple power storage devices 10 included in the battery pack 1.

[0092] (Modification) Next, a modified example of the above embodiment will be described. In the above embodiment, the electrode terminal of energy storage element 20 is a bolt terminal having a bolt portion, and the electrode terminal of energy storage element 20 and bus bar 40 are connected by inserting the bolt portion into a through hole of bus bar 40 and fastening a nut to the bolt portion. However, in this modified example, the electrode terminal of the energy storage element does not have a bolt portion, and is a welded terminal that is connected (joined) to the bus bar by welding.

[0093] Fig. 8 is a cross-sectional view showing the configuration around lid body 300 of an energy storage device according to a modified example of the present embodiment. Fig. 9 is a plan view showing the configuration of an energy storage device according to a modified example of the present embodiment. As shown in Figs. 8 and 9, energy storage elements 20 (energy storage elements 20I to 20K in the figure) in this modified example have positive electrode terminal 24 and negative electrode terminal 25 instead of positive electrode terminal 22 and negative electrode terminal 23 of energy storage element 20 in the above-described embodiment. Also, bus bar 42 in this modified example has terminal connection portion 42a and intermediate portion 42b.

[0094] The positive electrode terminal 24 and the negative electrode terminal 25 are welded terminals connected (joined) to the bus bar 42 by welding. Specifically, the positive electrode terminal 24 and the negative electrode terminal 25 are joined to the terminal connection portion 42a of the bus bar 42 by welding. For example, the positive electrode terminal 24 of the energy storage element 20I is welded to one of the terminal connection portions 42a of the bus bar 42, and the negative electrode terminal 25 of the energy storage element 20J is welded to the other terminal connection portion 42a of the bus bar 42.

[0095] That is, terminal connection portion 42a is a portion of busbar 42 that is connected to an electrode terminal of energy storage element 20, and two terminal connection portions 42a that are connected to electrode terminals of two different energy storage elements 20 are arranged on one busbar 42. Furthermore, intermediate portion 42b is a portion that is arranged between the two terminal connection portions 42a. Note that intermediate portion 42b is a curved portion (hinge portion) that is provided so that busbar 42 can expand and contract in the Y-axis direction and the Z-axis direction, and is provided protruding from the two terminal connection portions 42a on the positive side in the Z-axis direction.

[0096] Furthermore, cover 300 in this modification has a protrusion 310 and a recess 320 instead of the concave-convex structure of cover 100 in the above embodiment that is formed to accommodate a plurality of bolt terminals. That is, protrusion 310 is a protrusion with a protruding outer surface disposed opposite bus bar 42, and recess 320 is a recess with a recessed outer surface disposed adjacent to protrusion 310.

[0097] Here, the protruding portion 310 has a first protruding portion 311 arranged to face the electrode terminals of the energy storage elements 20 (positive electrode terminals 24 and negative electrode terminals 25 of the energy storage elements 20I to 20K in the figure). That is, the first protruding portion 311 is arranged to face the terminal connection portion 42a of the bus bar 42. Specifically, the first protruding portion 311 is arranged to cover the electrode terminals of the energy storage elements 20 from above (the positive side in the Z-axis direction) and the terminal connection portion 42a, and has a shape (rectangular in the figure) corresponding to the electrode terminals and the terminal connection portion 42a in a top view (as viewed from the Z-axis direction). In addition, the first protruding portion 311 is arranged to protrude further than a first recess 321 and a second recess 322 of a recess 320 described later.

[0098] Moreover, the protrusion 310 has a second protrusion 312 disposed opposite to the intermediate portion 42b of the busbar 42. Specifically, the second protrusion 312 is disposed so as to cover the upper side (the positive side in the Z-axis direction) of the intermediate portion 42b, and has a shape (rectangular in the figure) corresponding to the intermediate portion 42b in a top view (as viewed from the Z-axis direction). Moreover, the second protrusion 312 is formed to protrude further than the first protrusion 311.

[0099] The recess 320 has a first recess 321 disposed between two first protrusions 311 disposed opposite electrode terminals of two different energy storage elements 20 (for example, the negative electrode terminal 25 of the energy storage element 20J and the positive electrode terminal 24 of the energy storage element 20K). Specifically, the first recess 321 is disposed opposite the lid portion of the container 21 of the energy storage element 20 between two adjacent bus bars 42, and has a shape (rectangular in the figure) corresponding to the space between the two bus bars 42 in top view (viewed from the Z-axis direction).

[0100] In addition, the recess 320 has a second recess 322 arranged between two first convex portions 311 arranged opposite two electrode terminals of the same storage element 20 (for example, the positive terminal 24 and the negative terminal 25 of the storage element 20I).

[0101] Furthermore, the recess 320 has a third recess 323 that is disposed opposite at least one of the two terminal connection portions 42a and is recessed further than the second convex portion 312. In this modification, the third recess 323 is the above-mentioned first convex portion 311. That is, the first convex portion 311 is a convex portion relative to the first recess 321 and the second recess 322, but is a concave portion relative to the second convex portion 312, and therefore can also be referred to as the third recess 323.

[0102] 6, the conductive member 12 is disposed in the recess 320. That is, the conductive member 12 is disposed in any of the first recess 321, the second recess 322, and the third recess 323.

[0103] Here, for example, in the case where the conductive member 12 is arranged to extend in the X-axis direction (such as the second conductive member 12B and the third conductive member 12C in FIG. 6), if the conductive member 12 is arranged in the first recess 321 and extends in the X-axis direction, the conductive member 12 will interfere with the second convex portion 312.

[0104] Specifically, it is possible to place the conductive member 12 in a groove-shaped portion formed by the first recess 321 and the second recess 322 that are arranged to face each other between the negative electrode terminal 25 of the energy storage element 20J and the positive electrode terminal 24 of the energy storage element 20K. However, for the conductive member 12 (the second conductive member 12B and the third conductive member 12C in FIG. 6) that is arranged to extend straight in the X-axis direction across adjacent energy storage devices 10, the second convex portion 312 that is arranged to face each other between the positive electrode terminal 24 of the energy storage element 20J and the negative electrode terminal 25 of the energy storage element 20K and the conductive member 12 are arranged to overlap in the Z-axis direction, which increases the height dimension of the entire unit.

[0105] In such a case, by arranging the conductive member 12 in the third recess 323 (and the second recess 322) on both sides in the X-axis direction, the conductive member 12 can be arranged parallel to the X-axis direction. Furthermore, as shown in Fig. 6, when the conductive member 12 is connected to the first connector 85, the conductive member 12 can also be arranged in the first recess 321. For example, the first conductive member 12A in Fig. 6 can also be arranged in the first recess 321 without any problem.

[0106] Regarding the second conductive member 12B and the third conductive member 12C in FIG. 6, as another solution to the problem of interference in the Z-axis direction described above, it is possible to, for example, bend the conductive member 12 between the second recess 322 or adjacent energy storage devices 10 and position the conductive member 12 in the first recess 321 while avoiding the second convex portion 312.

[0107] Other configurations of this modified example are similar to those of the above embodiment, so detailed description will be omitted.

[0108] Although the power storage device 10 and the battery pack 1 according to the embodiment of the present invention have been described above, the present invention is not limited to the above embodiment. In other words, the embodiment disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0109] For example, in the above embodiment, the power storage device 10 is provided with the harness plate 50 as a wiring holding member, but the wiring holding member does not have to be a member generally recognized as a "plate." For example, it may be a member with a frame structure that holds the internal wiring 65, the first connector 85, and the second connector 86.

[0110] Furthermore, the member electrically connected to the second connector 86 via the second wiring 65b does not have to be the thermistor 63. For example, an electrical component other than the thermistor 63 may be connected to the second wiring 65b, such as a liquid leakage sensor that detects liquid leakage from the energy storage elements 20, and the voltage applied via the second wiring 65b is smaller than the rated voltage of the energy storage device 10. Furthermore, an electrical device connected by one or more electric wires as the second wiring 65b, and transmitting a signal indicating the state of the energy storage device 10 to an external control device via the one or more electric wires and the second connector 86 may be connected to the one or more electric wires.

[0111] Furthermore, the number of components such as a thermistor that are included in the power storage device 10 and electrically connected to the second connector 86 via the second wiring 65b is not limited to "2." The number of such components may be one or more. Furthermore, different types of components (for example, a thermistor and a liquid leakage sensor) may be electrically connected to the second connector 86 via the second wiring 65b.

[0112] Further, although each of the first connector 85 and the second connector 86 has a plurality of pins for connection to external wiring, there is no particular limitation on the shape and type of each of the first connector 85 and the second connector 86. For example, the first connector 85 or the second connector 86 may have a plurality of pin holes into which a plurality of pins of a connector at an end of the external wiring are inserted.

[0113] Moreover, the shape of the energy storage element 20 included in the energy storage device 10 does not have to be rectangular. The shape of the energy storage element 20 may be, for example, a circle, an ellipse, an oval, a polygon other than a rectangle, or a shape that combines curved lines and straight lines in a plan view. In any case, the above-mentioned effects of the harness plate 50 according to the present embodiment, such as improved safety, can be achieved.

[0114] In the above embodiment, the electrode terminals (positive terminal 22 and negative terminal 23) of energy storage element 20 have bolt portions, and the bolt portions are inserted into through holes in busbar 40 and nuts are fastened to the bolt portions, thereby connecting the electrode terminals of energy storage element 20 to busbar 40. However, the electrode terminals of energy storage element 20 may not have bolt portions, and the electrode terminals and busbar 40 may be connected (joined) by welding. Furthermore, the method of joining detection terminal 80 to the electrode terminals or busbar 40 is not limited to fastening with nuts, and the joining may be by welding.

[0115] Furthermore, configurations constructed by arbitrarily combining the components included in the above-described embodiments and their modifications are also included within the scope of the present invention.

[0116] The present invention can be realized not only as the power storage device 10, but also as a wiring holding member (harness plate 50 in the embodiment) included in the power storage device 10. [Industrial Applicability]

[0117] The present invention can be applied to an electricity storage device including an electricity storage element such as a lithium ion secondary battery. [Explanation of symbols]

[0118] 10. Energy storage device 10A first power storage device 10B Second power storage device 10C Third power storage device 10D Fourth power storage device 10E Fifth power storage device 12, 13 Conductive material 12A First conductive member 12B Second conductive member 12C Third conductive member 20, 20A~20K Energy storage element 50 Harness Plate 51 First Regulatory Department 52 Second Regulatory Department 54 Wall 56a First area 56b Second area 65a First wiring 65b Second wiring 85 First Connector 85a, 86a connection ports 86 Second Connector 100, 300 Lid 105 Lower part

Claims

1. A storage element; A first wiring electrically connected to the energy storage element; A flat rectangular wiring holding member that holds the first wiring; a first connector connected to the first wiring, the first connector being attached to the wiring holding member and allowing an external wiring to be attached and detached; an inner lid disposed between the power storage element and the wiring holding member, the inner lid holds the wiring holding member and holds the power storage element, the wiring holding member has a restricting portion which is a claw-shaped portion or a protrusion-shaped portion, the restricting portion holds the first wiring, the first connector has a connection port arranged in a second direction intersecting a first direction in which the wiring holding member and the first connector are arranged, The first wiring is arranged to bypass a second region of the wiring holding member on the connection port side of the first connector. Energy storage device.

2. A storage element; A first wiring electrically connected to the energy storage element; A flat rectangular wiring holding member that holds the first wiring; a first connector connected to the first wiring, the first connector being attached to the wiring holding member and allowing an external wiring to be attached and detached; an inner lid disposed between the power storage element and the wiring holding member, the inner lid holds the wiring holding member and holds the power storage element, the first connector has a connection port arranged in a second direction intersecting a first direction in which the wiring holding member and the first connector are arranged, the wiring holding member is larger in size than the first connector when viewed from the first direction, The first connector is disposed in a central portion of the wiring holding member. Energy storage device.

3. The first wiring is arranged to bypass a second region of the wiring holding member on the connection port side of the first connector. The power storage device according to claim 2 .

4. The wiring holding member has a wall portion provided upright along at least a part of a periphery of the second region. The power storage device according to claim 1 .

5. the restricting portion restricts the first wirings to positions in a first region where the first wirings do not overlap with each other in an arrangement direction of the energy storage element and the wiring holding member. The power storage device according to claim 1 .

6. The first wiring is connected to an electrode terminal of the energy storage element or a bus bar connected to the energy storage element. The power storage device according to any one of claims 1 to 5.

7. Further, a second wiring which is a wiring for a lower voltage than the first wiring and is held by the wiring holding member is provided. The power storage device according to claim 5 .

8. the first wiring and the second wiring are disposed in the first region at positions not overlapping with each other in an arrangement direction of the energy storage element and the wiring holding member. The power storage device according to claim 7.

9. the wiring holding member has a restricting portion that restricts the first wirings to positions in a first region where the first wirings do not overlap with each other in an arrangement direction of the energy storage element and the wiring holding member, The power storage device according to claim 2 .

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