JP7382701B2 - Power storage device - Google Patents

Description

The present invention relates to a power storage device including a power storage unit having a power storage element and an exterior body, and a conductive member connected to the power storage unit.

BACKGROUND ART Conventionally, power storage devices are widely known in which a conductive member such as external wiring is connected to a power storage unit having a power storage element and an exterior body. For example, in Patent Document 1, a harness (conductive member) is connected to a battery module (power storage unit) having a battery cell (power storage element) and a cover member (exterior body), and the harness is connected to both ends of the cover member. A battery pack (power storage device) configured to be disposed between upright portions provided in the battery pack (power storage device) is disclosed.

JP2016-51511A

However, the conventional power storage device described above has a problem in that it is not possible to save space because a space is provided for arranging the conductive member connected to the power storage unit. In other words, in the above-mentioned conventional power storage device, the standing portions are provided at both ends of the cover member in order to arrange the harness as a conductive member, so the height of the standing portions is added to the height of the cover member. This increases the height of the cover member, making it impossible to save space.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a power storage device that can save space even in a configuration in which a conductive member connected to a power storage unit is arranged.

In order to achieve the above object, a power storage device according to one aspect of the present invention includes a first power storage unit having a power storage element, a bus bar connected to an electrode terminal of the power storage element, and an exterior body; a first conductive member connected to the unit; the exterior body includes a convex portion with a protruding outer surface disposed opposite to the bus bar; and a concave portion with a concave outer surface disposed adjacent to the convex portion. and the first conductive member is disposed in the recess.

According to this, in the power storage device, the exterior body of the first power storage unit has a convex portion facing the bus bar and a recessed portion adjacent to the convex portion, and the first power storage unit connected to the first power storage unit The conductive member is placed in the recess. In other words, in the first power storage unit, the portion where the bus bar is arranged protrudes outward, so when the exterior body is formed along the bus bar, a convex portion is formed at the position of the exterior body facing the bus bar, A concave portion is formed at a position adjacent to the convex portion. Thereby, by arranging a conductive member such as an external wiring connected to the first power storage unit in the recess, it is possible to effectively utilize the space within the recess and save space.

Further, the convex portion may include a first convex portion disposed facing the electrode terminal of the power storage element.

According to this, in the exterior body of the first power storage unit, the convex portion disposed facing the bus bar has the first convex portion disposed facing the electrode terminal of the power storage element. In other words, since the electrode terminal of the energy storage element protrudes outward, when an exterior body is formed along the electrode terminal, a first convex portion is formed in the exterior body at a position facing the electrode terminal, and the first convex portion A recess is formed at a position adjacent to the portion. Thereby, by arranging a conductive member such as an external wiring connected to the first power storage unit in the recess, it is possible to effectively utilize the space within the recess and save space.

Further, the recessed portion may include a first recessed portion disposed between two of the first convex portions disposed facing electrode terminals of two different power storage elements.

According to this, the first concave portion is formed in the exterior body of the first power storage unit between the two first convex portions facing the electrode terminals of two different power storage elements. In other words, by forming a first recess on the outer surface of the exterior body opposite to the gap between the electrode terminals of different power storage elements, and arranging the conductive member in the first recess, the gap between the electrode terminals of different power storage elements is can be used effectively to save space.

Further, the recessed portion may include a second recessed portion disposed between the two first convex portions disposed facing two electrode terminals of the same power storage element.

According to this, the second recess is formed in the exterior body of the first power storage unit between the two first convex parts facing the two electrode terminals of the same power storage element. In other words, by forming a second recess on the outer surface of the exterior body opposite to the gap between the electrode terminals of the same power storage element, and arranging the conductive member in the second recess, the gap between the electrode terminals of the same power storage element can be Space can be saved by making effective use of the gaps.

Further, the bus bar includes two terminal connection portions connected to electrode terminals of two different power storage elements, and an intermediate portion disposed between the two terminal connection portions, and the convex portion includes the A second convex portion may be provided to face the intermediate portion.

According to this, the exterior body of the first power storage unit has the second convex portion disposed opposite to the intermediate portion of the bus bar. In other words, in the first power storage unit, the intermediate part of the bus bar generally protrudes outward, so if the exterior body is formed along the intermediate part, the position of the exterior body facing the intermediate part A second protrusion is formed at the second protrusion, and a recess is formed at a position adjacent to the second protrusion. Thereby, by arranging a conductive member such as an external wiring connected to the first power storage unit in the recess, it is possible to effectively utilize the space within the recess and save space.

Moreover, the recessed portion may include a third recessed portion that is recessed more than the second convex portion and is arranged to face at least one of the two terminal connecting portions.

According to this, the exterior body of the first power storage unit has the third recess that is arranged to face the terminal connection portion of the bus bar. In other words, in the first energy storage unit, the terminal connection part of the bus bar is generally recessed more than the middle part, so if the exterior body is formed along the bus bar, the third recess facing the terminal connection part will be recessed. It is formed. Thereby, by arranging a conductive member such as an external wiring connected to the first power storage unit in the third recess, it is possible to effectively utilize the space within the third recess and save space.

Further, the first electrically conductive member is an external wiring connected to the first power storage unit, and the first power storage unit further includes a connector to which the external wiring is connected, and the connection port of the connector is The opening may be arranged in a direction along the bottom surface of the recess and toward the inside of the recess.

According to this, the first power storage unit has a connector to which external wiring as a first conductive member is connected, and the connection port of the connector is connected in a direction along the bottom surface of the recess of the exterior body and inside the recess. It is placed with an opening facing the direction. In this way, since the connection port of the connector opens toward the recess of the exterior body, external wiring can be placed in the recess and connected to the connector. Thereby, the recess can be effectively used as a space for connecting external wiring to the connector, so space can be saved.

Further, the connector may be arranged at a central portion of the exterior body.

According to this, by arranging the connector in the center of the exterior body, it is possible to protect the connector and the external wiring connected to it from external shocks and the like. In other words, by placing the connector in the recess located in the center of the exterior body, a protrusion is placed on the outside of the connector, so the protrusion prevents the connector and external wiring from interfering with external components. is suppressed, and the connector and external wiring can be effectively protected. For example, if the external wiring is electrically connected to the electrode terminal of the power storage element, this can be protected from the risk of the external wiring coming into contact with each other and causing a short circuit. By arranging the connector in the center of the exterior body in this way, it is possible to save space and effectively protect the connector and external wiring.

Further, the exterior body may include a holding portion that holds the first conductive member within the recess.

According to this, since the exterior body has a holding part that holds the first conductive member within the recess, the conductive member is held in the concave part of the exterior body, so that the conductive member does not float up from the recess or from the exterior body. It can prevent it from coming off. In this way, by holding the first conductive member within the recess and preventing it from protruding from the recess, space can be saved.

The invention further includes a second electrical storage unit different from the first electrical storage unit, and a second electrically conductive member connected to the second electrical storage unit, and the second electrically conductive member is connected to the recessed portion of the first electrical storage unit. It may also be placed in

According to this, the power storage device further includes a second power storage unit and a second conductive member connected to the second power storage unit, and the second conductive member is connected to the recess of the exterior body of the first power storage unit. Placed. In this way, space can be saved by effectively utilizing the space within the recess of the exterior body of the first power storage unit as a space for arranging the second conductive member connected to the second power storage unit. .

Further, the first power storage unit further includes a harness plate on which internal wiring is arranged between the power storage element and the exterior body, and the exterior body has the above-mentioned harness plate in a portion where the recess is not formed. It may be provided with ribs facing the harness plate.

According to this, the rib facing the harness plate is provided in the portion of the exterior body where the recess is not formed. In other words, since there is a gap between the part of the exterior body where the recess is not formed and the harness plate, a rib is arranged between the part and the harness plate. In this way, even if a recess is formed in the exterior body for arranging a conductive member, the rib can fill the resulting gap between the harness plate and the harness plate, and the internal wiring on the harness plate. It is possible to prevent connectors and the like from floating up.

Further, the first power storage unit may further include a thermistor, and the rib may be arranged at a position that closes an opening adjacent to the thermistor.

According to this, the ribs of the exterior body are placed in positions that close the openings adjacent to the thermistor, so by blocking the openings near the thermistor with the ribs of the exterior body, the thermistor is prevented from being affected by external temperature. Can be suppressed. In this way, the rib of the exterior body that fills the gap with the harness plate can also be used as the rib that closes the opening near the thermistor.

Note that the present invention can be realized not only as a power storage device but also as an exterior body included in the power storage device.

According to the power storage device of the present invention, space can be saved even in a configuration in which a conductive member connected to the power storage unit is arranged.

FIG. 1 is a perspective view showing the appearance of a power storage unit according to an embodiment. FIG. 3 is an exploded perspective view showing each component when the power storage unit according to the embodiment is disassembled. FIG. 2 is a perspective view showing the structure of a lid of a power storage unit according to an embodiment. FIG. 3 is a cross-sectional view showing the structure around the lid of the power storage unit according to the embodiment. FIG. 3 is a cross-sectional view showing the structure around the lid of the power storage unit according to the embodiment. FIG. 1 is a plan view showing the configuration of a power storage device according to an embodiment. FIG. 7 is a cross-sectional view showing a structure around a lid of a power storage unit according to a modification of the embodiment. FIG. 7 is a plan view showing the configuration of a power storage device according to a modification of the embodiment.

Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Note that the embodiments described below are comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples, and do not limit the present invention. Further, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the most significant concept will be described as arbitrary constituent elements. Further, in each figure, dimensions etc. are not strictly illustrated.

In addition, in the following explanation and drawings, the direction in which the electrode terminals of one power storage element are arranged, the direction in which the short sides of the container of the power storage element face each other, or the direction in which the long sides of the exterior body of the power storage unit face each other are referred to as the X-axis direction. Define. Further, the direction in which a plurality of power storage elements are lined up, the direction in which the long sides of the container of the power storage elements face each other, the thickness direction of the container, or the direction in which the short sides of the exterior body of the power storage unit face each other is defined as the Y-axis direction. In addition, the direction in which the exterior body of the power storage unit and the outer lid are lined up, the direction in which the power storage element, the inner cover, the harness plate, and the outer cover are lined up, the direction in which the container body of the power storage element and the lid are lined up, or the vertical direction is Z. Defined as axial 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, the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described as the vertical direction below. Furthermore, in the following description, for example, the plus side in the X-axis direction refers to the side in the direction of the arrow of the X-axis, and the minus side in the X-axis direction refers to the side opposite to the plus side in the X-axis direction. The same applies to the Y-axis direction and the Z-axis direction.

(Embodiment)
First, the configuration of power storage unit 10 included in power storage device 1 (see FIG. 6) in this embodiment will be described. FIG. 1 is a perspective view showing the appearance of a power storage unit 10 according to the present embodiment. FIG. 2 is an exploded perspective view showing each component when power storage unit 10 according to the present embodiment is disassembled.

The power storage unit 10 is a device that can charge electricity from the outside and discharge electricity to the outside. For example, the power storage unit 10 is a battery module used for power storage, power supply, and the like. Specifically, the power storage unit 10 is used for, for example, a vehicle 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. It is used as a battery for driving moving objects such as machines or for starting engines.

As shown in FIGS. 1 and 2, the power storage unit 10 includes an exterior body 11 consisting of a lid body 100 and an exterior body body 200, a plurality of power storage elements 20 housed inside the exterior body 11, an inner lid 30, and a plurality of A bus bar 40, a harness plate 50, internal wiring 60, etc. are provided.

The exterior body 11 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage unit 10 . That is, the exterior body 11 is disposed outside of the power storage element 20, the harness plate 50, etc., and protects the power storage element 20 and the like from impacts by arranging them at predetermined positions. 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 power storage element 20 and the like from coming into contact with metal members and the like.

Here, the exterior body 11 has a flat rectangular lid body 100 that constitutes a lid (outer lid) of the exterior body 11 and an exterior body main body 200 that constitutes a main body of the exterior body 11 . The exterior body 200 is a bottomed rectangular cylindrical housing with an opening formed therein. That is, the lid 100 is arranged so as to close the opening of the exterior body 200. Note that the lid 100 and the main body 200 may be made of the same material, or may be made of different materials. Further, an opening 100a that is a rectangular through hole is formed in the center of the lid 100, and rectangular notches are 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 100b is formed, and an opening 100c, which is a rectangular notch, is formed at the center of the lid 100 in the X-axis direction and on the minus side in the Y-axis direction. A detailed explanation of the structure of this lid body 100 will be described later.

The power storage element 20 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, it is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. . The power storage element 20 has a flat rectangular parallelepiped (prismatic) shape, and in this embodiment, eight power storage elements 20 (power storage elements 20A to 20H) are arranged in the Y-axis direction. Note that the shape of the power storage elements 20 and the number of power storage elements 20 arranged are not limited. In addition, the power 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, or a capacitor. It may also be a primary battery that can use the stored electricity without having to do so.

Specifically, the power storage element 20 includes a metal container 21, and a lid portion of the container 21 is provided with a positive electrode terminal 22 and a negative electrode terminal 23, which are metal electrode terminals. Note that the lid portion of the container 21 may be provided with a liquid injection part for injecting the electrolytic solution, a gas exhaust valve that discharges gas to release the pressure when the pressure inside the container 21 increases, or the like. Further, inside the container 21, an electrode body (also referred to as a power storage element or a power generation element), a current collector (a positive electrode current collector and a negative electrode current collector), etc. are arranged, and an electrolytic solution (non-aqueous electrolyte) etc. Although it is enclosed, detailed explanation will be omitted.

Here, the positive electrode terminal 22 and the negative electrode terminal 23 are formed with threads that protrude from the lid portion of the container 21 toward the lid body 100 (upward, that is, toward the positive side in the Z-axis direction). It is a bolt terminal having a bolt part. The negative electrode terminal 23 of the power storage element 20A and the positive electrode terminal 22 of the power storage element 20H, which are the outermost electrode terminals of the plurality of power storage elements 20, are connected to the corners of the lid body 100 on the positive side in the X-axis direction and on both sides in the Y-axis direction. It is exposed through the opening 100b formed in the . By connecting this outermost electrode terminal to an external terminal (not shown) or by having this outermost electrode terminal function as an external terminal, the power storage unit 10 can be charged with electricity from the outside, and Electricity can be discharged to the outside.

The inner lid 30 is a flat rectangular member that constitutes the inner lid of the exterior body 11 and has a function of reinforcing the exterior body body 200. Moreover, the inner lid 30 is disposed between the harness plate 50 and the power storage element 20, and holds the harness plate 50 from below and the power 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, for example. Furthermore, openings 31 are formed at corners of the inner lid 30 on the positive side in the X-axis direction and on both sides in the Y-axis direction. This opening 31 is an opening for inserting a connecting member 41 that connects a thermistor 63 and an electrode terminal of the power storage element 20, which will be described later.

The bus bar 40 is a rectangular plate-like member that is arranged on the plurality of power storage elements 20 (on the inner lid 30) and electrically connects the electrode terminals of the plurality of power storage elements 20. The bus bar 40 is made of a conductive member made of metal, such as copper, copper alloy, aluminum, or aluminum alloy. Specifically, a through hole is formed in the bus bar 40, and a bolt portion of an electrode terminal of the electricity storage element 20 is inserted into the through hole and a nut is fastened to the bolt portion, thereby connecting the bus bar 40 and the bolt portion. It is connected to the electrode terminal. In this embodiment, bus bar 40 connects eight power storage elements 20 in series by connecting positive electrode terminals 22 and negative electrode terminals 23 of adjacent power storage elements 20. Note that the connection mode of the power storage element 20 is not limited to the above, and any combination of series connection and parallel connection may be used.

Further, as described above, the connection member 41 is arranged at a position corresponding to the negative electrode terminal 23 of the power storage element 20A and the positive electrode terminal 22 of the power storage element 20H, which are the outermost electrode terminals of the plurality of power storage elements 20. . The connecting member 41 is a member that connects the outermost electrode terminal and the thermistor 63. That is, a through hole is formed in the connecting member 41, and the bolt portions of these outermost electrode terminals are inserted into the through hole, and the thermistor 63 is connected to the tip of the connecting member 41. , is configured to be able to measure the temperature of the electrode terminal. Further, the connecting member 41 has a tip inserted into the opening 31 of the inner lid 30, and a portion other than the tip that is connected to the electrode terminal is an opening formed in a corner of the lid 100. It is exposed from 100b.

The harness plate 50 is a flat rectangular member on which internal wiring 60, connectors 61, 62, thermistor 63, and other electrical components are arranged, and is arranged between the power storage element 20 and the lid 100. The harness plate 50 is made of an insulating material such as PC, PP, PE, PPS, PBT, or ABS resin, for example. That is, the harness plate 50 is placed on the inner lid 30, holds the internal wiring 60, connectors 61, 62, thermistor 63, etc., insulates the internal wiring 60, etc. from other members, and insulates the internal wiring 60, etc. from other members. The position of internal wiring 60, etc. is regulated.

The internal wiring 60 is an internal harness that includes wiring for making various connections, such as wiring that connects each electrode terminal of the power storage element 20 and the connector 61, and wiring that connects the thermistor 63 and the connector 62. , attached to the harness plate 50.

Connector 61 is a high voltage connector connected to each electrode terminal of power storage element 20 . The connector 61 is attached to the harness plate 50 and is exposed through an opening 100a formed in the center of the lid 100. The connector 62 is a low voltage connector connected to the thermistor 63. The connector 62 is attached to the harness plate 50 and is exposed from an opening 100c formed at the center of the lid 100 in the X-axis direction and on the minus side in the Y-axis direction. Thereby, the connector 61 is arranged at the center of the exterior body 11, and the connector 62 is arranged at the end of the exterior body 11. Further, the connectors 61 and 62 are arranged with connection ports opening outward, and external wiring is connected to the connection ports.

The thermistor 63 is a temperature sensor that is attached to the harness plate 50 and connected to the electrode terminal of the power storage element 20 via the connection member 41, and measures the temperature of the electrode terminal (that is, measures the temperature of the power storage element 20). be. In this embodiment, two thermistors 63 are arranged, but the number of thermistors 63 is not particularly limited.

Next, the configuration of the lid 100 of the power storage unit 10 and the configuration around the lid 100 will be described in detail. FIG. 3 is a perspective view showing the structure of the lid 100 of the power storage unit 10 according to the present embodiment. Specifically, FIG. 3(a) is an enlarged perspective view showing the structure of the lid 100 shown in FIG. 2, and FIG. 3(b) is a perspective view of the lid shown in FIG. 3(a). FIG. 2 is a perspective view of the body 100 when viewed diagonally from below. Moreover, FIGS. 4 and 5 are cross-sectional views showing the structure around the lid body 100 of the power storage unit 10 according to the present embodiment. Specifically, FIG. 4 is a cross-sectional view showing the structure around the lid body 100 when the power storage unit 10 shown in FIG. 1 is cut along a plane parallel to the XZ plane including the IV-IV line. Further, FIG. 5 is a cross-sectional view showing the structure around the lid body 100 when the power storage unit 10 shown in FIG. 1 is cut along a plane parallel to the YZ plane including the VV line.

As shown in these figures, the lid body 100 has a convex portion 110 with a protruding outer surface, which is disposed facing the bus bar 40, and a concave portion 120 with a concave outer surface, which is disposed adjacent to the convex portion 110. are doing. In this embodiment, convex portion 110 is a convex portion disposed facing the electrode terminal of power storage element 20. Note that the convex portion 110 is an example of a first convex portion.

Specifically, convex portion 110 has convex portions 111 and 112 at positions facing negative electrode terminal 23 and positive electrode terminal 22 of power storage element 20B. That is, convex portion 110 has convex portions 111 and 112 at positions facing bus bar 40 connected to negative electrode terminal 23 of power storage element 20B and bus bar 40 connected to positive electrode terminal 22 of power storage element 20B. ing. Further, the convex portion 110 has convex portions 113 and 114 at positions facing the positive electrode terminal 22 and the negative electrode terminal 23 of the power storage element 20C. That is, the convex portion 110 has convex portions 113 and 114 at positions facing the bus bar 40 connected to the positive terminal 22 of the power storage element 20C and the bus bar 40 connected to the negative terminal 23 of the power storage element 20C. ing.

Similarly, the convex portion 110 has a convex portion 115 at a position facing each of the negative electrode terminal 23 and the positive electrode terminal 22 of the power storage element 20D, and the positive electrode terminal 22 and the negative electrode terminal 23 of the power storage element 20E. ~118. That is, the convex portion 110 connects the bus bar 40 connected to the negative terminal 23 of the power storage element 20D, the bus bar 40 connected to the positive terminal 22 of the power storage element 20D, the bus bar 40 connected to the positive terminal 22 of the power storage element 20E, and , has convex portions 115 to 118 at positions facing the bus bar 40 connected to the negative electrode terminal 23 of the power storage element 20E.

Note that the convex portions 111 and 112 are connected together with the convex portion facing the positive electrode terminal 22 of the power storage element 20A to form one large convex portion 101. An opening 100b is formed in the convex portion 101 at a position facing the negative electrode terminal 23 of the power storage element 20A. Further, the protrusions 117 and 118 are connected together with the protrusions facing the positive terminals 22 and negative terminals 23 of the power storage elements 20F and 20G and the negative terminal 23 of the power storage element 20H to form one large protrusion 102. ing. An opening 100b is formed in the convex portion 102 at a position facing the positive electrode terminal 22 of the power storage element 20H.

Here, the convex portion 110 (convex portions 111 to 118) is a portion having an uneven structure in which the outer surface of the lid body 100 protrudes and the inner surface is recessed. The bolt part and nut of the terminal are arranged. That is, the convex portion 110 is arranged so as to cover the periphery and upper part of the electrode terminal of the power storage element 20.

Further, the recess 120 has first recesses 121 to 126 that are arranged between two protrusions 110 that are arranged to face the electrode terminals of two different power storage elements 20. Specifically, the first concave portion 121 is a convex portion that is two convex portions 110 facing the negative electrode terminal 23 of the power storage element 20B and the positive electrode terminal 22 of the power storage device 20C, which are the electrode terminals of the two adjacent power storage elements 20. This is a recess located between 111 and 113. Similarly, the first recessed portion 122 is a recessed portion arranged between the convex portions 112 and 114 facing the positive electrode terminal 22 of the power storage element 20B and the negative electrode terminal 23 of the power storage element 20C. The same applies to the first recesses 123 to 126.

Further, the recess 120 has second recesses 127 to 129 arranged between the two protrusions 110 that are arranged opposite to the two electrode terminals of the same power storage element 20. Specifically, the second recess 127 is a recess disposed between the two projections 111 and 112, which are the two projections 110 facing the negative electrode terminal 23 and the positive electrode terminal 22 of the power storage element 20B. Similarly, the second recess 128 is between the protrusions 113 and 114 facing the positive terminal 22 and the negative terminal 23 of the power storage element 20C, and the second recess 129 is located between the negative terminal 23 and the positive terminal 22 of the power storage element 20D. This is a concave portion located between the convex portions 115 and 116.

In this way, the recess 120 is one large recess formed by connecting the first recesses 121 to 126 and the second recesses 127 to 129, and has the bottom surface 103. An opening 100a is formed at the boundary between the bottom surface 103 of the recess 120 and the protrusion 102. Then, the connector 61 is arranged in the opening 100a. As a result, as shown in FIG. 4, the connection port 61a of the connector 61 is opened in the direction along the bottom surface 103 of the recess 120 and toward the inside of the recess 120.

Further, the exterior body 11 has ribs 130 and 131 facing the harness plate 50 in a portion where the recess 120 is not formed. That is, rectangular ribs 130 and 131 protruding downward (to the negative side in the Z-axis direction) are arranged on the inner surface (surface on the negative side in the Z-axis direction) of the convex portion 110 (convex portions 101 and 102) of the lid body 100. ing. Specifically, as shown in FIG. 5, the rib 130 protrudes toward the harness plate 50 and is disposed at a position where its tip abuts the upper surface of the harness plate 50.

Moreover, the rib 131 is arranged at a position that protrudes toward the inner lid 30 and closes the opening 31 of the inner lid 30. That is, the rib 131 is arranged at a position that closes the opening 31 which is the opening adjacent to the thermistor 63. In the present embodiment, the ribs 131 are arranged so as to come into contact with the upper surface of the tip of the connecting member 41 connected to the thermistor 63, and press down on the thermistor 63 from above, and at least in the opening 31 near the thermistor 63. Part of it is blocked.

Further, the lid body 100 is provided with holding parts 113a and 114a that hold external wiring within the recess 120. The holding portions 113a and 114a are convex portions formed between the convex portions 113 and 114 so as to be continuous with the convex portions 113 and 114, and have through holes formed at their tip portions. That is, the external wiring is connected to the power storage unit 10, placed in the recess 120, and held within the recess 120 by the holding parts 113a and 114a. These matters will be explained in detail below. FIG. 6 is a plan view showing the configuration of power storage device 1 according to the present embodiment.

As shown in the figure, the power storage device 1 includes three power storage units 10, a first power storage unit 10A, a second power storage unit 10B, and a third power storage unit 10C, and three conductive members 12, a first conductive member 12A. , a second conductive member 12B and a third conductive member 12C. The first conductive member 12A is external wiring (external harness) connected to the first power storage unit 10A. Similarly, the second conductive member 12B and the third conductive member 12C are external wiring (external harness) connected to the second power storage unit 10B and the third power storage unit 10C.

The first conductive member 12A is connected to the connector 61 of the first power storage unit 10A, the second conductive member 12B is connected to the connector 61 of the second power storage unit 10B, and the third conductive member 12C is connected to the third power storage unit 10A. It is connected to the connector 61 of the unit 10C. At this time, the first conductive member 12A is arranged in the recess 120 of the first power storage unit 10A, and the second conductive member 12B is arranged in the recess 120 of the first power storage unit 10A and the recess 120 of the second power storage unit 10B. . Similarly, the third conductive member 12C is arranged in the recess 120 of the first power storage unit 10A, the recess 120 of the second power storage unit 10B, and the recess 120 of the third power storage unit 10C.

Specifically, the first conductive member 12A is arranged in the first recess 125 of the first power storage unit 10A. Further, the second conductive member 12B is arranged in the first recesses 123 and 124 of the first power storage unit 10A, and the first recess 123 and the second recess 129 of the second power storage unit 10B. Similarly, the third conductive member 12C is connected to the first recesses 121 and 122 of the first power storage unit 10A, the first recesses 121 and 122 of the second power storage unit 10B, and the first recess 121 and the first recess 122 of the third power storage unit 10C. It is arranged in two recesses 128 and 129. Note that these conductive members 12 (external wiring) are connected to a substrate or the like, and control of charging and discharging of the power storage element 20 in the power storage device 1 is performed.

Further, each power storage unit 10 includes a harness cover 70 that covers the conductive member 12. That is, the lid 100 of the exterior body 11 of each power storage unit 10 is provided with holding parts 113a and 114a. The conductive member 12 is held within the recess 120 by placing and fixing the harness cover 70 on the holding parts 113a and 114a. For example, the harness cover 70 is fixed to the lid 100 by inserting (fitting) protrusions provided on the harness cover 70 into through holes formed in the holding parts 113a, 114a.

As described above, according to the power storage device 1 according to the embodiment of the present invention, the exterior body 11 of the power storage unit 10 has the convex portion 110 facing the bus bar 40 and the concave portion 120 adjacent to the convex portion 110. The conductive member 12 connected to the power storage unit 10 is arranged in the recess 120. That is, in the power storage unit 10, the portion where the bus bar 40 is arranged protrudes outward, so when the exterior body 11 is formed along the bus bar 40, the convex portion 110 is formed in the exterior body 11 at a position facing the bus bar 40. A concave portion 120 is formed at a position adjacent to the convex portion 110. Thereby, by arranging the conductive member 12 such as external wiring connected to the power storage unit 10 in the recess 120, it is possible to effectively utilize the space within the recess 120 and save space.

Furthermore, since the electrode terminals of the power storage element 20 protrude outward, when the exterior body 11 is formed along the electrode terminals, the convex portions 110 are formed at the positions of the exterior body 11 facing the electrode terminals. A recess 120 is formed adjacent to the portion 110. Thereby, by arranging the conductive member 12 such as external wiring connected to the power storage unit 10 in the recess 120, it is possible to effectively utilize the space within the recess 120 and save space.

Further, in the exterior body 11 of the power storage unit 10, first recesses 121 to 126 are formed between two convex parts 110 facing the electrode terminals of two different power storage elements 20. That is, the first recesses 121 to 126 are formed on the outer surface of the exterior body 11 facing the gaps between the electrode terminals of different power storage elements 20, and the conductive member 12 is placed in one of the first recesses 121 to 126. By doing so, it is possible to effectively utilize the gaps between the electrode terminals of different power storage elements 20 and to save space.

Further, in the exterior body 11 of the power storage unit 10, second recesses 127 to 129 are formed between two convex parts 110 facing two electrode terminals of the same power storage element 20. That is, the second recesses 127 to 129 are formed on the outer surface of the exterior body 11 so as to face the gaps between the electrode terminals of the same power storage element 20, and the conductive member 12 is placed in one of the second recesses 127 to 129. By arranging them, it is possible to effectively utilize the gaps between the electrode terminals of the same power storage element 20 and save space.

Furthermore, the power storage unit 10 has a connector 61 to which external wiring as the conductive member 12 is connected, and the connection port 61a of the connector 61 is connected in the direction along the bottom surface 103 of the recess 120 of the exterior body 11 and in the direction along the bottom surface 103 of the recess 120. It is arranged to open inward. In this way, since the connection port 61a of the connector 61 opens toward the recess 120 of the exterior body 11, external wiring can be placed in the recess 120 and connected to the connector 61. Thereby, the recess 120 can be effectively used as a space for connecting external wiring to the connector 61, so that space can be saved.

Moreover, by arranging the connector 61 in the center of the exterior body 11, the connector 61 and the external wiring (conductive member 12) connected thereto can be protected from external shocks and the like. That is, by arranging the connector 61 in the recess located in the center of the exterior body 11, the protrusion 110 is disposed outside the connector 61, so the protrusion 110 allows the connector 61 and external wiring to be Interference with other members is suppressed, and the connector 61 and external wiring can be effectively protected. For example, if the external wiring is electrically connected to the electrode terminal of the power storage element 20, this can be protected from the risk of the external wiring coming into contact with each other and causing a short circuit. By arranging the connector 61 in the center of the exterior body 11 in this manner, the connector 61 and external wiring can be effectively protected while saving space.

The exterior body 11 also includes holding parts 113a and 114a that hold the conductive member 12 within the recess 120. That is, the harness cover 70 is held by the holding parts 113a and 114a of the lid 100, so that the conductive member 12 is held within the recess 120. Therefore, it is possible to hold the conductive member 12 in the recess 120 of the exterior body 11 and prevent the conductive member 12 from floating up from the recess 120 or coming off from the exterior body 11. In this way, by holding the conductive member 12 within the recess 120 and preventing it from protruding from the recess 120, space can be saved.

The power storage device 1 also includes a first power storage unit 10A, a second power storage unit 10B, etc., which are power storage units 10, a first conductive member 12A, a second conductive member 12B, etc., which are conductive members 12, and The second conductive member 12B is arranged in the recess 120 of the exterior body 11 of the first power storage unit 10A. In this way, the space in the recess 120 of the exterior body 11 of the first power storage unit 10A is effectively used as a space for arranging the second conductive member 12B connected to the second power storage unit 10B, thereby saving space. can be achieved.

In addition, ribs 130 and 131 facing the harness plate 50 are provided in the exterior body 11 in a portion where the recess 120 is not formed. That is, since there is a gap between the harness plate 50 and the harness plate 50 in the portion of the exterior body 11 where the recess 120 is not formed, the ribs 130 and 131 are arranged between the harness plate 50 and the harness plate 50 . In this way, even if the recess 120 for arranging the conductive member 12 is formed in the exterior body 11, the ribs 130 and 131 can fill the resulting gap between the harness plate 50 and the harness plate 50. It is also possible to prevent the internal wiring 60, connectors 61, 62, etc. on the harness plate 50 from floating up.

Furthermore, since the rib 131 of the exterior body 11 is arranged in a position that closes the opening 31 adjacent to the thermistor 63, by closing the opening 31 near the thermistor 63 with the rib 131 of the exterior body 11, the thermistor 63 can be removed from the outside. can be suppressed from being affected by the temperature. In this way, the rib 131 of the exterior body 11 that fills the gap with the harness plate 50 can also be used as a rib that closes the opening 31 near the thermistor 63.

(Modified example)
Next, a modification of the above embodiment will be described. In the embodiment described above, the electrode terminal of the power storage element 20 is a bolt terminal having a bolt part, and when the bolt part is inserted into the through hole of the bus bar 40 and a nut is fastened to the bolt part, the power storage element 20 The electrode terminal of the bus bar 40 is connected to the bus bar 40. However, in this modification, the electrode terminal of the power storage element does not have a bolt part, but is a welding terminal that is connected (joined) to the bus bar by welding.

FIG. 7 is a cross-sectional view showing a structure around a lid 300 of a power storage unit according to a modification of the present embodiment. Further, FIG. 8 is a plan view showing the configuration of a power storage unit according to a modification of the present embodiment. Note that FIG. 7 is a diagram corresponding to a part of FIG. 5, and FIG. 8 is a diagram corresponding to a part of FIG. 6.

As shown in FIGS. 7 and 8, the power storage element 20 in this modification (in the figure, power storage elements 20I to 20K) replaces the positive terminal 22 and the negative terminal 23 of the power storage element 20 in the above embodiment. It has a positive electrode terminal 24 and a negative electrode terminal 25. Moreover, the bus bar 42 in this modification has a terminal connection part 42a and an intermediate part 42b.

The positive terminal 24 and the negative terminal 25 are welding terminals that are connected (joined) to the bus bar 42 by welding. Specifically, the positive terminal 24 and the negative terminal 25 are joined to the terminal connection portion 42a of the bus bar 42 by welding. For example, the positive terminal 24 of the power storage element 20I is welded to one terminal connection portion 42a of the bus bar 42, and the negative terminal 25 of the power storage element 20J is welded to the other terminal connection portion 42a of the bus bar 42. be done.

In other words, the terminal connection portion 42a is a portion of the bus bar 42 that is connected to the electrode terminal of the power storage element 20, and two terminal connection portions 42a are connected to the electrode terminals of two different power storage elements 20 for one bus bar 42. Two terminal connecting portions 42a are arranged. Further, the intermediate portion 42b is a portion disposed between the two terminal connecting portions 42a. Note that the intermediate portion 42b is a curved portion (hinge portion) provided so that the bus bar 42 can expand and contract in the Y-axis direction and the Z-axis direction, and protrudes from the two terminal connecting portions 42a toward the positive side in the Z-axis direction. It is provided.

Moreover, the lid 300 in this modification example has a protrusion 310 and a recess 320 in place of the protrusion 110 and recess 120 of the lid 100 in the above embodiment. That is, the convex portion 310 is a convex portion with a protruding outer surface that is disposed facing the bus bar 42, and the concave portion 320 is a concave portion with a concave outer surface that is disposed adjacent to the convex portion 310.

Here, the convex portion 310 has a first convex portion 311 arranged to face the electrode terminals of the power storage elements 20 (in the figure, the positive electrode terminals 24 and negative electrode terminals 25 of the power storage elements 20I to 20K). . That is, the first convex portion 311 is arranged to face the terminal connection portion 42a of the bus bar 42. Specifically, the first convex portion 311 is arranged so as to cover the upper part (the positive side in the Z-axis direction) of the electrode terminal and the terminal connection part 42a of the power storage element 20, and is ) has a shape (rectangular shape in the figure) corresponding to the electrode terminal and the terminal connecting portion 42a. Further, the first convex portion 311 is arranged to protrude from a first concave portion 321 and a second concave portion 322 of a concave portion 320, which will be described later.

Further, the convex portion 310 has a second convex portion 312 that is arranged to face the intermediate portion 42b of the bus bar 42. Specifically, the second convex portion 312 is arranged to cover the upper part (positive side in the Z-axis direction) of the intermediate portion 42b, and corresponds to the intermediate portion 42b when viewed from above (as viewed from the Z-axis direction). It has a rectangular shape (in the figure, a rectangular shape). Further, the second convex portion 312 is formed to protrude more than the first convex portion 311 .

The recessed portion 320 is arranged between two first convex portions 311 that are arranged to face the electrode terminals of two different electricity storage elements 20 (for example, the negative electrode terminal 25 of the electricity storage element 20J and the positive electrode terminal 24 of the electricity storage element 20K). It has a first recessed portion 321. Specifically, the first recess 321 is disposed between two adjacent bus bars 42 to face the lid portion of the container 21 of the power storage element 20, and when viewed from above (when viewed from the Z-axis direction). , has a shape (rectangular in the figure) corresponding to the space between the two bus bars 42. Note that the first recess 321 has the same configuration as the first recesses 121 to 126 in the above embodiment.

Further, the recessed portion 320 is arranged between two first convex portions 311 that are arranged to face two electrode terminals of the same electricity storage element 20 (for example, the positive electrode terminal 24 and the negative electrode terminal 25 of the electricity storage element 20I). It has a second recess 322. Note that the second recess 322 has the same configuration as the second recesses 127 to 129 in the above embodiment.

Furthermore, the recess 320 has a third recess 323 that is recessed more than the second protrusion 312 and is arranged to face at least one terminal connection part 42a of the two terminal connection parts 42a. In this modification, the third concave portion 323 is the first convex portion 311 described above. In other words, the first convex portion 311 is a convex portion with respect to the first concave portion 321 and the second concave portion 322, but is a concave portion with respect to the second convex portion 312, so it can also be referred to as a third concave portion 323. can.

In the above configuration, the conductive member 12 is arranged in the recess 320, as described with reference to FIG. That is, the conductive member 12 is disposed in any one of the first recess 321 , the second recess 322 , and the third recess 323 .

Here, for example, when disposing the conductive member 12 extending in the X-axis direction (such as the second conductive member 12B and the third conductive member 12C in FIG. 6), the conductive member 12 is placed in the first recess. 321 and extending in the X-axis direction, the conductive member 12 will interfere with the second convex portion 312.

Specifically, a conductive layer is formed in a groove-shaped portion formed by a first recess 321 and a second recess 322 that are arranged to face each other between the negative electrode terminal 25 of the power storage element 20J and the positive electrode terminal 24 of the power storage element 20K. It is possible to arrange the member 12. However, regarding the conductive members 12 (second conductive member 12B and third conductive member 12C in FIG. 6) that are arranged to extend straight in the X-axis direction across adjacent power storage units 10, the power storage elements Since the second convex portion 312 and the conductive member 12, which are arranged to face each other between the positive electrode terminal 24 of the power storage element 20J and the negative electrode terminal 25 of the power storage element 20K, are arranged so as to overlap in the Z-axis direction, The height dimension of the entire unit becomes large.

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 in parallel to the X-axis direction. Furthermore, as shown in FIG. 6, when connecting the conductive member 12 to the connector 61, the conductive member 12 can also be placed in the first recess 321. For example, the first conductive member 12A in FIG. 6 can be placed in the first recess 321 without any problem.

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, for example, the conductive member It is possible to arrange the conductive member 12 in the first recess 321 while avoiding the second protrusion 312 by bending the conductive member 12 .

Note that the other configurations in this modification are the same as those in the above embodiment, so detailed explanations will be omitted.

As described above, the power storage device according to this modification can achieve the same effects as the above embodiment. In particular, the exterior body (lid body 300) of the power storage unit has a second convex portion 312 that is arranged to face the intermediate portion 42b of the bus bar 42. That is, when the intermediate portion 42b of the bus bar 42 protrudes outward, when the exterior body is formed along the intermediate portion 42b, the second convex portion 312 is formed at a position facing the intermediate portion 42b of the exterior body. , a recess 320 is formed at a position adjacent to the second protrusion 312 . Thereby, by arranging a conductive member such as an external wiring connected to the power storage unit in the recess 320, it is possible to effectively utilize the space within the recess 320 and save space.

Further, the exterior body (lid body 300) of the power storage unit has a third recess 323 that is arranged to face the terminal connection portion 42a of the bus bar 42. That is, since the terminal connecting portion 42a of the bus bar 42 is recessed more than the intermediate portion 42b, when the exterior body is formed along the bus bar 42, the third recess 323 facing the terminal connecting portion 42a is formed. Thereby, by arranging a conductive member such as an external wiring connected to the power storage unit in the third recess 323, it is possible to effectively utilize the space within the third recess 323 and save space.

In the bus bar 42, the intermediate portion 42b is a curved portion that protrudes from the terminal connection portion 42a toward the positive side in the Z-axis direction. However, even if the intermediate portion 42b is not curved as described above but has a flat plate shape, etc., a harness for voltage or temperature measurement, etc. is connected to the intermediate portion 42b, so that the connection part with the harness, etc. is connected to a terminal. When protruding from the portion 42a, the lid 300 has a convex portion similar to the above configuration. In this case, the same thing can be said as in the above modification, and the same effects as in the above modification can be achieved.

Although the power storage devices according to the embodiments of the present invention and their modifications have been described above, the present invention is not limited to the embodiments and their modifications. In other words, the embodiment disclosed herein and its modifications should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and scope equivalent to the claims are included.

For example, in the embodiment described above, a battery module including a plurality of power storage elements 20 is exemplified as the power storage unit 10, but the power storage unit 10 may be a battery pack including a plurality of battery modules. The same applies to the above modification (the same applies to the following).

In addition, in the above embodiment, the recess 120 formed in the lid 100 is formed between two protrusions 110, but the recess adjacent to one protrusion 110 (in the lid 100) is The recess 120 may be a recess whose outer surface is recessed in a step-like manner.

Further, in the above embodiment, the conductive member 12 is an external wiring, but the conductive member 12 may be a conductive member other than the external wiring. For example, the conductive member 12 may be a substrate, a fuse, a relay, a thermistor, or other electrical components.

Further, in the above embodiment, the power storage device 1 has three power storage units 10 arranged in a row, but the number and arrangement of the power storage units 10 included in the power storage device 1 are not limited to the above. Not done. For example, only one power storage unit 10 may be arranged, or if a plurality of power storage units 10 are arranged, it does not matter how many power storage units 10 are arranged at any position.

Further, in the above embodiment, the conductive members 12 are arranged at the positions shown in FIG. It doesn't matter which recess in the house it's placed in.

Moreover, in the embodiment described above, the holding parts 113a and 114a are provided on the lid body 100, and the harness cover 70 is disposed thereon. However, a structure may be adopted in which the harness cover 70 is arranged without providing the holding parts 113a and 114a on the lid body 100, or a structure in which the harness cover 70 is not arranged.

Furthermore, in the embodiment described above, the power storage unit 10 includes the connector 61 in the center of the lid body 100, which has the connection port 61a opening toward the recess 120, and external wiring can be connected to the connector 61. did. However, the connector 61 may be placed at any position on the lid 100, and the connection port 61a of the connector 61 may be opened in any direction. Alternatively, power storage unit 10 may not include connector 61, and wiring and the like extending from opening 100a may be arranged in recess 120.

Further, in the embodiment described above, the lid 100 is provided with a rib 130 that contacts the harness plate 50 and a rib 131 that contacts the connecting member 41 and closes a part of the opening 31 near the thermistor 63. I decided to do so. However, the rib 130 may not be in contact with the harness plate 50, and the rib 131 may not be in contact with the connecting member 41, or may close the entire opening 31. Alternatively, the lid 100 may have a configuration in which the ribs 130 and 131 are not provided. Alternatively, a configuration in which the harness plate 50 and the thermistor 63 are not provided may be used.

Further, forms constructed by arbitrarily combining the constituent elements included in the above embodiments and their modifications are also included within the scope of the present invention.

Note that the present invention can be realized not only as a power storage device but also as an exterior body (cover body 100 or 300) included in the power storage device.

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

1 Power storage device 10 Power storage unit 10A First power storage unit 10B Second power storage unit 11 Exterior body 12 Conductive member 12A First conductive member 12B Second conductive member 20, 20A to 20K Power storage element 22, 24 Positive electrode terminal 23, 25 Negative electrode terminal 31 Opening 40, 42 Bus bar 42a Terminal connection 42b Intermediate portion 50 Harness plate 60 Internal wiring 61, 62 Connector 61a Connection port 63 Thermistor 100, 300 Lid 101, 102, 110-118, 310 Convex portion 103 Bottom 113a, 114a Holding Part 120, 320 Recess 121 to 126, 321 First recess 127 to 129, 322 Second recess 130, 131 Rib 311 First convex part 312 Second convex part 323 Third concave part

Claims (11)

a first electricity storage unit including an electricity storage element having an electrode terminal protruding from a container , a bus bar connected to the electrode terminal of the electricity storage element, and an exterior body;
a first electrically conductive member connected to the first electricity storage unit,
The exterior body is
a convex portion with a protruding outer surface disposed opposite to the bus bar in the protruding direction of the electrode terminal ;
a concave portion with a concave outer surface disposed adjacent to the convex portion;
The first electrically conductive member is arranged in the recess. Power storage device. The power storage device according to claim 1 , wherein the convex portion includes a first convex portion arranged to face an electrode terminal of the power storage element. The power storage device according to claim 2, wherein the recess has a first recess that is arranged between two of the first convex parts that are arranged to face electrode terminals of two different power storage elements. The power storage device according to claim 2 or 3, wherein the recess has a second recess that is arranged between the two first protrusions that are arranged to face two electrode terminals of the same power storage element. The bus bar has two terminal connection parts connected to electrode terminals of two different power storage elements, and an intermediate part disposed between the two terminal connection parts,
The power storage device according to any one of claims 1 to 4, wherein the convex portion has a second convex portion disposed opposite to the intermediate portion. The first conductive member is an external wiring connected to the first power storage unit,
The first power storage unit further includes a connector to which the external wiring is connected,
The power storage device according to any one of claims 1 to 5 , wherein the connection port of the connector is opened in a direction along a bottom surface of the recess and toward the inside of the recess. The power storage device according to claim 6 , wherein the connector is arranged at a central portion of the exterior body. The power storage device according to any one of claims 1 to 7 , wherein the exterior body includes a holding portion that holds the first conductive member within the recess. moreover,
a second power storage unit different from the first power storage unit;
a second conductive member connected to the second electricity storage unit,
The power storage device according to any one of claims 1 to 8 , wherein the second conductive member is arranged in the recess of the first power storage unit. The first power storage unit further includes a harness plate on which internal wiring is arranged between the power storage element and the exterior body,
The power storage device according to any one of claims 1 to 9 , wherein the exterior body has a rib that faces the harness plate in a portion where the recess is not formed. The first power storage unit further includes a thermistor,
The power storage device according to claim 10 , wherein the rib is arranged at a position that closes an opening adjacent to the thermistor.

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