JP2011129675A - Electric storage device, and electric storage module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce resistance of each electrode terminal and to efficiently join terminals together in an electric storage device and an electric storage module consisting of a plurality of electric storage devices. <P>SOLUTION: A necessary number of electric storage devices 10 are divided into a plurality of electric storage device groups 20, equal numbers of electric storage devices 10 of the respective groups are connected in series by joining electrode terminals 13, and the plurality of electric storage device groups 20 are connected in parallel. Each of the electric storage devices 10 has a container 12 for storing electric storage elements formed having a polygonal external shape including two planes which face each other in one direction, and also includes, as a pair of electrode terminals 13, a positive electrode terminal 13a having a positive electrode junction plane X substantially flush with one of the two planes of the container which face each other in the one direction and a negative electrode terminal 13b having a negative electrode junction plane Y substantially flush with the other of the two planes as well. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power storage module including a power storage device and a required number of power storage devices.

  As electric storage devices having a long charge / discharge cycle life, electric double layer capacitors, lithium ion batteries, and the like are attracting attention (Patent Documents 1 to 8).

  An example thereof will be described with reference to FIG. 19. The power storage device 100 includes a power storage element 111 (see FIG. 21) that stores electric charges, and a container 112 that houses the power storage element 111.

  The power storage element 111 is formed in a rectangular laminate from a positive electrode body, a negative electrode body, and a separator interposed therebetween. The positive electrode body and the negative electrode body are composed of an electrode layer for storing electric charges and a current collecting layer for taking in and out electric charges, and the same polarity of the current collecting layers are bound to each other. , Negative terminal) are joined.

  The electrode terminal 113 is formed in a short shape from a metal plate, a bundling portion of the same polarity of the current collecting layer is joined to one end portion located inside the container 112, and the other end side is drawn straight out to the outside of the container. The container 112 is formed of a laminate film (a resin film having a laminated structure including a metal intermediate layer), and seals the power storage element 111 in a housed state in which a part (tip side) of each terminal 113 protrudes to the outside of the container.

  In such an electricity storage device 100, the withstand voltage is about 3V to 5V, and when applied to a drive power source of an electric vehicle or the like, a plurality of electricity storage devices 100 are provided in order to ensure a required storage capacity and a required full charge voltage. Are connected in parallel and many of them are connected in series.

  20 to 22 show a power storage module M-0 including a required number of power storage devices 100. The required number of power storage devices 100 are divided into a plurality of power storage device groups 120. FIG. The same number of power storage devices 100 in each group are arranged in the front-rear direction of the container 112 (the relative direction of the front surface 101 and the rear surface 104), and a predetermined number of adjacent power storage devices 100 are connected in parallel via the electrode terminals 113. The space is connected in series via the bus bar 114.

  The plurality of power storage device groups 120 are arranged in the left-right direction of the container 112 (the relative direction between the right surface 103 and the left surface), and the power storage device groups are connected in series via the buzz bar 115 and the bus bar 117. The junction between the negative terminals and the junction between the positive terminals located at the forefront of each group 120 are respectively connected in series to an external charge / discharge circuit via the bus bar 116. The three-dimensional arrows in the figure are for defining three directions of front and rear, up and down, and left and right.

In FIG. 22, R _A is the resistance of the positive terminal 113 a of the power storage device 100, the resistance R _B of the negative terminal 113 b, R _C is the resistance of the bus bars 115 and 116, and R _D is the resistance of the bus bar 114. , _RE is the resistance of the bus bar 117.

JP 2003-272972 A JP 2006-108380 A JP 2003-272966 A Japanese Patent No. 3869183 JP 2006-338934 A JP 2008-204985 A JP 2002-353078 A JP-A-2005-190885

  In such a power storage module, the electrode terminals 113 are bent so that the same poles of each other are in contact with each other, and one ends of the bus bars 114 and 115 are overlapped with each other and joined by welding. These joints are three-layer welding in which the bus bars 114 and 115 are added to the two electrode terminals 13. In order to protect the electricity storage element of the electricity storage device from the high heat associated with welding, the length of the part where the electrode terminal is pulled out (the terminal part protruding outside from the container) may be taken large, and the resistance of the series path is promoted. The heat loss (power loss) during discharge also increases.

  An object of this invention is to provide an effective means for coping with such a problem.

  According to a first aspect of the present invention, in a power storage module including a required number of power storage devices, the required number of power storage devices is divided into a plurality of power storage device groups, and the same number of power storage devices are connected in series by joining electrode terminals. A plurality of power storage device groups are connected in parallel to each other, each power storage device includes a power storage element for storing electric charge, a container for storing the power storage element, and a pair of electrode terminals connected to the positive electrode side and the negative electrode side of the power storage element And the outer shape of the container is formed in a polygon including two surfaces facing in one direction, and a positive electrode that is substantially flush with one of the two surfaces facing in one direction of the container as a pair of electrode terminals. And a positive electrode terminal having a bonding surface and a negative electrode terminal having a negative electrode bonding surface substantially flush with the other of the two surfaces.

  According to a second invention, in the power storage module according to the first invention, the same number of power storage devices in each group are arranged in one direction of the container, and the pair of electrode terminals are adjacent in one direction of the container. Different polarities of the bonding surface of one positive electrode terminal or negative electrode terminal of the electricity storage device and the bonding surface of the other negative electrode terminal or positive electrode terminal are arranged mirror-symmetrically with respect to the surface adjacent to the container in one direction. The power storage devices arranged in the one direction are connected by joining of joining surfaces of different polarities that are mirror-symmetrical.

  According to a third aspect of the present invention, in the power storage module according to the first aspect or the second aspect, the plurality of power storage device groups connected in parallel to the charge / discharge circuit are connected to each other at the same position between the power storage devices. A member is provided.

  According to a fourth aspect of the present invention, in a power storage module including a required number of power storage devices, the required number of power storage devices is divided into a plurality of power storage device groups, and the same number of power storage devices are connected in series by joining electrode terminals. A plurality of power storage device groups are connected in parallel to each other, each power storage device includes a power storage element for storing electric charge, a container for storing the power storage element, and a pair of electrode terminals connected to the positive electrode side and the negative electrode side of the power storage element And the outer shape of the container is formed in a polygon including two surfaces facing in one direction and two surfaces facing in a direction substantially orthogonal to the two surfaces facing in the one direction. As the electrode terminal, a positive electrode terminal having a first positive electrode bonding surface substantially flush with one of the two surfaces facing in one direction of the container, and a negative electrode having a first negative electrode bonding surface substantially flush with the other of the two surfaces A terminal, and the positive electrode end One of the two surfaces facing in the direction substantially orthogonal to the two surfaces facing in one direction and the other of the two surfaces facing in the direction substantially perpendicular to the two surfaces in the same manner as the second positive electrode bonding surface and the negative electrode terminal. And a second negative electrode bonding surface substantially flush with each other.

  According to a fifth invention, in the power storage module according to the fourth invention, the same number of power storage devices in each group are arranged in one direction of the container, and the plurality of power storage device groups are substantially orthogonal to one direction of the container. The one pair of electrode terminals are arranged such that one of the first positive electrode bonding surface or the first negative electrode bonding surface and the other first negative electrode bonding surface or the first positive electrode bonding of the electricity storage device adjacent in one direction of the container. Are arranged symmetrically with respect to a plane adjacent to the containers in one direction, and the electricity storage devices arranged in the one direction are joined by joining the joint surfaces of the different polarities that are mirror-symmetric. A second positive electrode bonding surface or a second negative electrode bonding surface of one of the storage devices adjacent to each other in a direction substantially orthogonal to the one direction of the container, and the other second negative electrode bonding surface or the second positive electrode bonding surface. Same poles are unidirectional The storage devices adjacent to each other in a direction substantially orthogonal to the one direction are connected by joining the joint surfaces of the same poles having the mirror symmetry, arranged in mirror symmetry with respect to a surface adjacent to the substantially orthogonal direction, It is characterized by that.

  6th invention is the electrical storage module which concerns on 4th invention or 5th invention, The said container of the electrical storage device group of the both sides in which the said several electrical storage device group is located in a direction substantially orthogonal to one direction of the said container It is characterized by comprising a conductive member that connects the joints of different polarities between power storage devices arranged in one direction to each other.

  According to a seventh aspect of the present invention, there is provided an electrical storage device comprising: an electrical storage element that stores electric charge; a container that houses the electrical storage element; and a pair of electrode terminals connected to a positive electrode side and a negative electrode side of the electrical storage element. The outer shape is formed into a polygon including two surfaces facing in one direction and two surfaces facing in a direction substantially perpendicular to the two surfaces facing in one direction, and a pair of electrode terminals is used as one pair of electrode terminals. A positive electrode terminal having a first positive electrode bonding surface substantially flush with one of the two surfaces facing in the direction, and a negative electrode terminal having a first negative electrode bonding surface substantially flush with the other of the two surfaces, The second positive electrode joining surface that is substantially flush with one of the two surfaces facing the positive electrode terminal in the direction substantially orthogonal to the two surfaces facing the one direction, and the negative electrode terminal 2 facing the direction substantially orthogonal to the second surface. A second negative electrode bonding surface substantially flush with the other surface is formed respectively.

  According to an eighth aspect of the present invention, in the power storage device according to the seventh aspect, the pair of electrode terminals are formed by arranging the plurality of power storage devices in one direction of the container, The different polarities of one first positive electrode bonding surface and the other first negative electrode bonding surface are arranged mirror-symmetrically with respect to a surface adjacent to one direction of the containers, and a plurality of the electric storage devices are When arranged in a direction substantially orthogonal to one direction of the container, one of the second positive electrode bonding surface or the second negative electrode bonding surface and the other negative electrode terminal of the electricity storage device adjacent in the direction substantially orthogonal to the one direction of the container The same polarity of the joint surface of the positive electrode terminal is disposed mirror-symmetrically with respect to a surface adjacent to a direction substantially orthogonal to one direction of the containers.

  In the first invention, the plurality of power storage device groups are connected in parallel to each other, and the same number of power storage devices in each group are connected in series by joining electrode terminals. Each power storage device has a positive electrode terminal having a positive electrode joint surface substantially flush with one of two surfaces facing in one direction of the container, and a negative electrode terminal having a negative electrode joint surface substantially flush with the other of the two surfaces. Therefore, when arranged in one direction of the container, it becomes possible to easily superimpose the joining surfaces of the different polarities of the electrode terminals of the storage device adjacent in that direction, and by joining the joining surfaces of these different polarities The same number of power storage devices in each group can be efficiently connected in series. Since these joints are welding of two metal plates (forming electrode terminals) when welding is performed, compared to the conventional case of welding three by three, transmission to the power storage element accompanying welding is performed. Due to the relationship with heat, the extra length required for the part drawn out of the electrode terminal does not have to be increased. In addition, because of the two-layer welding, it is easy to obtain a good and stable weld. In addition, it is not necessary to take the extra length of the part that is drawn out of the electrode terminal, and a bus bar is not required for the serial connection between the electricity storage devices, so it is possible to shorten the series path that connects the same number of electricity storage devices in each group, Power loss (heat loss) during charging / discharging can be greatly reduced.

  In the second invention, the same number of power storage devices in each group are arranged in one direction where the two surfaces of the container face each other, and one positive electrode bonding surface and the other negative electrode bonding surface between the power storage devices adjacent in that direction. Since the mirrors are mirror-symmetric with respect to the adjacent surfaces of the containers, the joint surfaces of the different polarities can be overlapped only by arranging the electricity storage devices in one direction, and the joint surfaces can be easily and efficiently joined. Can do.

  In 3rd invention, between the electrical storage devices of the some electrical storage device group connected mutually in parallel becomes the same electric potential via a conductive member. The voltages of the power storage devices arranged in the column direction of the power storage device group between the same potentials are equalized. That is, the variation in the terminal voltage of the storage device caused by the variation in the individual storage capacity of the storage device is leveled (equalized) by the plurality of storage devices arranged in the column direction of the storage device group. become.

  In the fourth invention, the plurality of power storage device groups are connected in parallel to each other, and the same number of power storage devices in each group are connected in series by joining electrode terminals. The electric storage devices are arranged in one direction of the container and in a direction substantially orthogonal to the container, and the electric storage devices adjacent in one direction of the container are connected in series by bonding of the first positive electrode bonding surface and the first negative electrode bonding surface. The The electricity storage devices adjacent in a direction substantially orthogonal to one direction of the container are connected by joining the second positive electrode terminals or the second negative electrode joining surfaces. As a result, two power storage devices connected in series in one direction of the container (a set) are connected in series in a configuration (minimum unit circuit) in two rows in a direction orthogonal to the one direction of the container. In the unit circuit, the voltages at both ends of each set are leveled (equalized), so that variation in the terminal voltage of the electricity storage device due to charge / discharge or the like can be suppressed to be small.

  As the number of power storage device groups and the number of power storage devices in each group increase, the minimum unit circuit includes the power storage devices of each minimum unit circuit in four minimum unit circuits adjacent in one direction of the container and in a direction substantially orthogonal thereto. Since a minimum unit circuit can be shared one by one, voltage equalization (leveling) acting on the minimum unit circuit is chained beyond the range of the minimum unit circuit. If this chain extends to the entire module, it becomes possible to equalize (equalize) the terminal voltage of each storage cell.

  When joining the first positive electrode bonding surface and the first negative electrode bonding surface, the bonding between the second positive electrode terminals, and the bonding between the second negative electrode bonding surfaces, in the case of welding, the metal plate (forming the electrode terminal) Since the two-layer welding is performed, the extra length required for the portion drawn out of the electrode terminal does not have to be increased due to the relationship with the heat transfer to the power storage element accompanying the welding. In addition, because of the two-layer welding, it is easy to obtain a good and stable weld. In addition, it is not necessary to increase the extra length of the part that is led out of the electrode terminal, and a bus bar is not required for the serial connection between the energy storage devices. Therefore, it is possible to shorten the series path that connects the same number of energy storage devices in each group. The power loss (heat loss) during discharge can be greatly reduced.

  In the fifth invention, when each power storage device is arranged in one direction where the two surfaces of the container face each other, one first positive electrode bonding surface and the other first negative electrode bonding between the power storage devices adjacent to each other in that direction. When the surfaces are arranged in a direction substantially orthogonal to two surfaces facing in one direction of the container, the second positive electrode bonding surfaces between the storage devices adjacent to each other are aligned. Alternatively, since the second negative electrode bonding surfaces are mirror-symmetrical with respect to the adjacent surfaces of the containers, the power storage devices are arranged in one direction and in a direction substantially orthogonal thereto, and the bonding surfaces of different polarities in one direction and this The joint surfaces of the same poles overlap each other in a substantially orthogonal direction, and the joint surfaces can be easily and efficiently welded.

  In the sixth invention, the minimum unit circuit that shares one power storage device of each minimum unit circuit among the four adjacent minimum unit circuits between both sides in the column direction of the power storage device group by the conductive member As a result, it is possible to further promote a chain of equalization (leveling) of the voltage acting on the minimum unit circuit beyond the range of the minimum unit circuit.

  In the seventh invention, assuming a power storage module composed of a required number of power storage devices, the same effects as the fourth invention can be obtained. In addition, since the length (the height dimension of the electricity storage device) of the portion of the electrode terminal that is pulled out from the container is shortened, the occupied volume of the electricity storage device is reduced, and the electricity storage capacity per unit volume is also increased.

  In the eighth invention, assuming a power storage module including a required number of power storage devices, the same effects as the fifth invention can be obtained.

1 is an external perspective view of an electricity storage device according to a first embodiment of the present invention. It is sectional drawing of an electrical storage device similarly. It is an external appearance perspective view of an electrical storage module similarly. Similarly, the configuration of the power storage module will be described, in which (a) is a plan view, (b) is a side view, and (c) is an xx cross-sectional view. It is a circuit block diagram of an electrical storage module similarly. It is an external appearance perspective view of the electrical storage device which concerns on 2nd Embodiment of this invention. It is the structure explanatory drawing of an electrical storage device similarly. It is an external appearance perspective view of an electrical storage module similarly. It is a circuit block diagram of an electrical storage module similarly. It is an external appearance perspective view of the electrical storage module which similarly shows the modification concerning 2nd Embodiment. It is a circuit block diagram of an electrical storage module similarly. It is an external appearance perspective view of the electrical storage module which similarly shows another modification. It is an external appearance perspective view of the electrical storage module which similarly shows another modification. It is a circuit block diagram of an electrical storage module similarly. It is an external appearance perspective view of the electrical storage module which similarly shows another modification. It is a circuit block diagram of an electrical storage module similarly. It is an external appearance perspective view of the electrical storage module which similarly shows another modification. It is an external appearance perspective view of the electrical storage module which similarly shows another modification. It is an external appearance perspective view of the electrical storage device which shows a prior art example. It is an external appearance perspective view of an electrical storage module similarly. Similarly, the configuration of the power storage module will be described, in which (a) is a plan view, (b) is a side view, and (c) is an xx cross-sectional view. It is a circuit block diagram of an electrical storage module similarly.

  The embodiment based on this invention is described based on figures. In addition, three-dimensional arrows that define three directions, front and rear, up and down, and left and right, are attached everywhere in the figure.

  1 to 5 show a first embodiment. 1 and 2, the electricity storage device 10 is an electric double layer capacitor. The electric double layer capacitor 10 includes a power storage element 11 for storing electric charge, a container 12 for storing the power storage element 11, and a pair of electrode terminals 13 for taking in and out the charge of the power storage element.

  The electrical storage element 11 is comprised by the square laminated body from the positive electrode body, the negative electrode body, and the separator interposed between these. The positive electrode body and the negative electrode body are composed of an electrode layer (polarizable electrode) for storing electric charge and a current collecting layer (current collecting electrode) for taking in and out electric charge, and leads 14 of the same polarity of the current collecting layer are bound. The electrode terminal 13 corresponding to the polarity is connected to the binding portion.

  The container 12 is formed in a square shape (a rectangular parallelepiped) according to the outer shape of the power storage element 11, and a chamber for storing the power storage element 11 together with the electrolyte is provided therein. As a pair of electrode terminals 13, a terminal 13 a (a positive electrode terminal) having a positive electrode joint surface X that is substantially flush with one of two opposing surfaces of the container 12, and a negative electrode that is also substantially flush with the other of the two surfaces. And a terminal 13b (negative electrode terminal) having a joint surface Y.

  Each electrode terminal 13 is formed in a short shape from a metal plate, and a bundling portion of the leads 14 of the same polarity of the current collecting layer is joined to one end portion located in the inside (chamber) of the container 12 by welding or the like. The other end side protruding to the outside constitutes the joint surfaces X and Y.

  In this case, since the container 12 is a rectangular parallelepiped, two surfaces of the front surface 1 and the rear surface 4 (see FIG. 2), two surfaces of the left surface and the right surface 3, and an upper surface 2 and a lower surface of the container 12 are opposed to each other. However, since the electrode terminal 13 protrudes upward, any one of the two surfaces of the front surface 1 and the rear surface 4 and the two surfaces of the left surface and the right surface 3 except for the two surfaces of the upper surface 2 and the lower surface. Selected.

  In this example, two surfaces of the front surface 1 and the rear surface 4 are selected from the relationship with the arrangement direction of the power storage device 10 in the power storage module M-1 described later, and the negative electrode terminal 13b is one side (upper side) of the front surface 1 of the container 12. ) From the position approaching the left side of the container 12 is straightly drawn upward of the container 12 to form a negative electrode bonding surface Y substantially flush with the front surface 1 of the container 12, while the positive electrode terminal 13 a is formed on one side of the rear surface 4 of the container 12 ( From the position on the right side 3 side of the upper side), it is drawn straight above the container 12 to form a positive electrode bonding surface X that is substantially flush with the rear surface of the container 12.

  In this case, the container 12 includes a frame body 6 and a pair of film bodies 7. The frame 6 is formed in a quadrangular shape from a resin (having heat-welding and electrical insulating properties) in accordance with the outer shape of the rectangular power storage element. The frame body 6 includes an upper side portion, a lower side portion, a right side portion, and a left side portion, and a space surrounded by these is opened forward and backward. The film body 7 is formed from a laminate film into a sheet shape having substantially the same shape and size as the front and rear surfaces of the frame body. The laminated film has a laminated structure composed of a plurality of resin layers and a metal intermediate layer, and the surface layer facing the opening of the frame body 6 is formed of a resin of an electrically insulating material having a heat welding property.

  The electrode terminal 13 is composed of one end protruding inside the frame 6, the other end protruding outside the frame 6, and an intermediate portion bonded to one side of the frame 6. It is assembled between the frame body 6 and the film body 7 (in the heat welding resin) via an intermediate portion.

  In the heat sealing process, an intermediate portion of one electrode terminal 13 is overlapped on one side of the frame 6, in this case, the front surface 1 of the upper side, and the film body 7 is covered thereon, and the frame 6 is covered with a heat sealer. The periphery (peripheral part) of the film body 7 is heated together with the pressure from the front surface 1 side. Further, the middle portion of the other electrode terminal 13 is overlapped on the rear surface 4 of the upper side portion, and the film body 7 is covered thereon, and the periphery (peripheral portion) of the film body 7 from the rear surface 4 side of the frame body by the heat sealer. Heated with pressure.

  The heat-welding resin of the film plate 7 and the heat-welding resin of the frame body 6 are melted by heating and pressurizing with a heat sealer, and the film body 7 and the frame body 6 are sealed without gaps by the resin that solidifies after heat dissipation. Stopped. Moreover, the intermediate part of each terminal 13 is also wrapped in the solidified resin, and its periphery is sealed without a gap. Regarding the injection of the electrolytic solution, an untreated (non-thermally welded) portion is left in the heat sealing process, and the electrolytic solution is filled into the container from the untreated portion. The untreated portion is sealed by heat sealing after the electrolyte is injected.

  By such a process, a terminal 13a having a positive electrode bonding surface X that is substantially flush with one of the two opposite surfaces of the container 12 and a terminal 13b having the other substantially flat negative electrode bonding surface Y are provided. The electric double layer capacitor 10 (power storage device) can be easily and easily manufactured efficiently. The electric double layer capacitor 10 is provided with a gas vent valve (not shown) that keeps the internal pressure of the container 12 below a predetermined level.

  3 to 5 show the power storage module M-1, which is assembled from a required number of power storage devices 10 (power storage cells). The required number of power storage cells 10 is divided into a plurality of power storage device groups 20. The number of power storage devices in each group 20 is the same.

  The same number of power storage cells 10 in each group are arranged in the front-rear direction of the container 12 (the relative direction of the front surface 1 and the rear surface 4 of the container 12), and the adjacent power storage cells join electrode terminals 13 having different polarities. Are connected in series. Between adjacent power storage cells, the positive electrode bonding surface X of one power storage cell 10 and the negative electrode bonding surface Y of the other power storage cell 10 are arranged in mirror symmetry with respect to the adjacent surface of the containers.

In this case, the storage cell 10 is drawn straight upward from the position where the negative electrode terminal 13 b approaches the left side of one side (upper side) of the front surface 1, and the positive electrode terminal 13 a is one side (upper side) of the rear surface 4 of the container 12. Since the electrode 13 is drawn straight from the position close to the right surface 3 side to the upper side of the container 13, two types A and B having different arrangements of the electrode terminals 13 are used.

  The electrode terminals 13 of the electricity storage device A are arranged in the same manner as in FIG. The electrode terminal of the electricity storage device B is drawn straight out from the position where the positive electrode terminal 13a approaches the right surface 3 side of one side (upper side) of the front surface 1 and is substantially flush with the front surface 1 of the container 12. While forming the surface X, the negative electrode terminal 13b is drawn straight upward from the position on the left side of one side (upper side) of the rear surface of the container 12 and is substantially flush with the rear surface of the container 12. Y is formed.

  The power storage cells 10 of each group 20 are arranged in a line A-A-B-A-B in the front-rear direction of the container 12. Between A and B, the positive electrode bonding surface X of A and the negative electrode bonding surface Y of B are adjacent surfaces of the containers (the surface where the rear surface 4 of the container 12 of A and the front surface 1 of the container 12 of B overlap). It becomes mirror-symmetrical as a boundary, and these are joined by welding. Between B-A, the positive electrode bonding surface X of B, the negative electrode bonding surface Y of A, and the adjacent surfaces of the containers (the surface where the rear surface 4 of the B container 12 and the front surface 1 of the A container 12 overlap) are the boundaries. They are mirror-symmetric and are joined by welding.

  The plurality of power storage device groups 20 are arranged in a direction orthogonal to the front-rear direction of the container 12 (the relative direction between the right surface 3 and the left surface of the container 12). The same polarity of the electrode terminals 13 of the storage cells 10 located at both ends of the row of each group 20 are connected via a bus bar 21. When the bus bars 21 are external terminals of the power storage module M-1, external charge / discharge circuits (not shown) are connected to the bus bars 21. That is, the plurality of power storage device groups 20 are connected to each other in parallel with an external charge / discharge circuit. The charging / discharging circuit constitutes a power supply path from M-1 to the load and a power supply path from the charging source to M-1.

  The power storage module M-1 includes a conductive member 22 that connects the same position between power storage cells among power storage device groups. The conductive member 22 extends between the power storage device groups in the left-right direction of the container 12 (the relative direction of the left surface and the right surface 3 of the container 12), and in the illustrated case (M-1 is composed of two rows of power storage device groups 20). The both ends of the conductive member 22 are coupled (connected) by rivets 23 to the junctions between the A-Bs and the junctions between the B-As.

  In M-1, a plurality of power storage device groups 20 are connected in parallel to an external charge / discharge circuit, and the same number of power storage devices 10 in each group are connected in series by joining electrode terminals 13. Each storage cell 10 has a terminal 13a having a positive electrode bonding surface X that is substantially flush with one of two surfaces facing in one direction of the container 12, and a terminal having a negative electrode bonding surface Y that is also substantially flush with the other of the two surfaces. 13b, and when arranged in one direction of the container 12, one positive electrode bonding surface X and the other negative electrode bonding surface Y of the electrode terminal 13 of the storage cell 10 adjacent in that direction are Since the mirror surfaces are symmetric with respect to the adjacent surface, the joint surfaces X and Y of different polarities overlap each other only by arranging the power storage devices 10 in one direction, and the joint surfaces can be easily and efficiently joined. .

  When these joinings are based on welding (for example, spot welding), the welding is a two-layer welding of metal plates (forming the electrode terminals 13), and the joining of the bus bar 21 and the electrode terminals 13 is also a two-layer welding. Therefore, as compared with the conventional case where welding is performed three by three, the portion drawn to the outside of the electrode terminal 13 is required due to the heat transfer to the power storage element 11 of the power storage device 10 accompanying welding. The extra length does not have to be increased. Moreover, it becomes easy to obtain a favorable stable welded portion by welding two sheets. In addition, the extra length required for the portion of the electrode terminal 13 drawn to the outside is not required to be large, and bus bars (114 in FIGS. 20 and 21) for connecting the storage cells in series are not required. The series path connecting the storage cells 10 can be efficiently shortened, and the power loss (heat loss) during charging / discharging can be greatly reduced.

FIG. 5 shows a circuit configuration of the power storage module M-1. In FIG. 5, R ′ is the resistance of the electrode terminal 13 of the power storage device 10, R _E is the resistance of the bus bar 21, R _F is the resistance of the conductive member 22, and the power storage devices of the plurality of power storage device groups 20 The gap becomes the same potential via the conductive member 22. In this example, since the joints between A and B and the joints between B and A in each group 20 are connected via the conductive member 22, the A and A lines arranged in the column direction of the group 20 are connected. The terminal voltage variation and the BB terminal voltage variation are leveled (equalized). The storage device 10 has some variation in storage capacity and the like, and the terminal voltage of the storage cell 10 varies with charging / discharging. However, the storage device 10 is arranged in the column direction of the group 20 (the left-right direction of the container 12). Since the variation in the terminal voltage between −A and the variation in the terminal voltage between BB are leveled (equalized), the variation in the terminal voltage of the storage cell 10 due to charge / discharge or the like can be suppressed to a small level. As a result, since the rate of lowering the voltage (limit voltage) at the time of full charge of the power storage module M-1 can be expected to be small in consideration of variations in the power storage capacity of the power storage device 10, the limit voltage of M-1 is set higher. It becomes possible.

In the conductive member 22, when a potential difference occurs between the connection points at both ends, a current flows from the higher potential to the lower potential. However, if the potentials at the connection points at both ends are the same, no current flows, and the potential difference between the both ends. Therefore, when the combined resistance R1 excluding the internal resistance R _X of the electricity storage device is calculated without adding R _F , R1 = 6 · R ′ + (R _E / 2) is obtained.

In the circuit configuration of a conventional storage modules M-0 shown in FIG. 22, the combined resistance R0, the resistance R _B of the resistor R _A and the negative electrode terminal 113b of the positive terminal 113a of the electric storage device 100 is the same (R _A = R _B) Is calculated as R0 = 6 · R _A + 4 · R _C + 4R _D + R _E.

Comparing the combined resistance R1 of the present application with the conventional combined resistance R0, the resistance R ′ of the electrode terminal of the present application is smaller than the resistance of the conventional electrode terminal 113 and the resistance (4 · R) of the conventional bus bars 114 to 116. _C + 4R _D ) becomes unnecessary. Further, the resistance R _E of the bus bar of the present application is a resistance R _E of 1/2 because the bus bar 21 is configured to connect (connect) the same polarity of the electrode terminals 13, whereas the resistance of the conventional bus bar 117 is Since R _E is configured to connect (connect) the bus bars 115 of different polarities, the resistance R _E does not become 1/2. As a result, the combined resistance R1 of the present application can be significantly reduced as compared with the conventional combined resistance R0.

  In the electric double layer capacitor in which the power storage device 10 has a high output density, the combined resistance R1 is greatly reduced, which has a great effect of reducing the power loss associated with charge / discharge and the heat generation associated with charge / discharge.

  In the case of the conventional power storage device 100, the portion of the electrode terminal 113 protruding from the container 112 is the length of the portion protruding substantially vertically from the center of the upper surface of the container 112, the length of the portion extending substantially parallel to the front-rear direction of the container, In contrast, in the case of the electricity storage device 10 of the present application, the portion protruding from the container 12 of the electrode terminal 13 generally has the bonding surfaces X and Y of the electrode terminal 13 as the sum of the lengths of the portions that form the bonding surfaces between them. Since only the length of the portion to be formed is required, the height dimension of the power storage device and the power storage module is H (refer to FIG. 21) in the conventional case, whereas in the present application, it is H ′ (refer to FIG. 4). Be lowered. Therefore, in the case of the present application, the occupied volume of the electricity storage device 10 is reduced, and the electricity storage capacity per unit volume of the electricity storage module M-1 is also improved as compared with the conventional case.

  For the conductive member 22, an electric wire with a small diameter and a simple cross section is used within the allowable range of resistance. Of course, a bus bar with low resistance may be used.

  In FIG. 1 to FIG. 5, two types of storage devices 10 having different arrangements of electrode terminals 13 are used, but the bonding surfaces (positive bonding surface X and negative bonding surface Y) of a pair of electrode terminals 13 are containers. In the center of the left and right direction of 12, the container 12 is set to be disposed in the front-rear direction, so that a power storage module having the same capacity as that shown in FIGS. 3 to 5 can be configured from one type of power storage device.

  6 to 18 show a second embodiment. 6 and 7, the electricity storage device 50 is an electric double layer capacitor. The electric double layer capacitor includes a power storage element 51 that stores electric charge, a container 52 that houses the power storage element 51, and a pair of electrode terminals 53 that take in and out the charge of the power storage element 51.

  The power storage element 51 is formed in a rectangular laminated body from a positive electrode body, a negative electrode body, and a separator interposed therebetween. The positive electrode body and the negative electrode body are composed of an electrode layer (polarizable electrode) for storing electric charge and a current collecting layer (current collecting electrode) for taking in and out electric charge, and the leads of the same polarity of the current collecting layer are bound together. The electrode terminal 53 corresponding to the polarity is connected to the part.

  The container 52 is formed in a square shape (a rectangular parallelepiped shape) according to the outer shape of the power storage element 52, and a chamber for storing the power storage element 52 together with the electrolyte is provided therein. As a pair of electrode terminals 53, a terminal (positive electrode terminal 53a) having a first positive electrode bonding surface X-1 that is substantially flush with one of two opposite surfaces of the container 12, and the other of the two surfaces and a substantially surface. And a terminal (negative electrode terminal 53b) having a first negative electrode bonding surface Y-1 continuous with the first negative electrode bonding surface Y-1.

  Each terminal 53 is formed of a metal plate, and a bundling portion of leads having the same polarity of the current collecting layer is joined to one end portion located inside (chamber) of the container 52 by welding or the like, and protrudes to the outside of the container 52. The end side constitutes the first tangential positive electrode mating surface X-1 or the first negative electrode positive electrode surface Y-1.

  A second positive electrode bonding surface X-2, which is substantially flush with one of the two surfaces facing in the direction substantially orthogonal to the two surfaces facing in one direction of the container 52, is provided on the other end side protruding outside the terminal 53a. Similarly to the terminal 53b, a second negative electrode joint surface Y-2 that is substantially flush with the other of the two surfaces facing in a direction substantially orthogonal to the two surfaces is provided on the other end side that protrudes to the outside of the terminal 53b.

  In this case, since the container 52 is a rectangular parallelepiped, the two surfaces of the front surface 1 and the rear surface are two surfaces facing in one direction, with respect to the two surfaces facing the container 52 and the two surfaces facing in a direction substantially orthogonal thereto. The two surfaces of the left surface and the right surface 3 are two surfaces that are substantially orthogonal to one direction.

  In this example, the negative electrode terminal 53 b protrudes from the left side end of one side (upper side) of the front surface 1 of the container 52 to the upper side of the container 52, and the first negative electrode bonding surface Y substantially flush with the front surface 1 of the container 52. 1 is formed, the positive electrode terminal 53a protrudes upward from the end of the one side (upper side) of the rear surface of the container 52 on the right surface 3 side, and is substantially flush with the rear surface of the container 52. Surface X-1 is formed. A part of the negative electrode terminal 53b protrudes from the end on the front surface 1 side of the one side (upper side) of the left surface of the container 52 to the second negative electrode bonding surface Y-2 that is substantially flush with the left surface of the container 52. On the other hand, a part of the positive electrode terminal 53a protrudes from the rear side end of one side (upper side) of the right surface 3 to the upper side of the container 52, and the second negative electrode bonding surface X− is substantially flush with the right surface 3 of the container 52. 2 is formed.

  The container 52 includes a box portion 57 formed in accordance with the outer shape of the rectangular power storage element 51, and a lid portion 58 that seals the upper surface of the box portion 57 that opens. Molded from an insulating material).

  The electrode terminal 53 includes one end protruding from the inner surface of the lid 58, the other end protruding from the outer surface of the lid 58, and an intermediate portion embedded in the lid 58, and is insert-molded together with the lid 58. . A bundling portion of the leads 59 of the same polarity of the electricity storage element 51 is joined to one end portion protruding from the inner surface of the lid portion 58 of each terminal 53 by welding or the like, and the lid portion 58 connects the electricity storage element 51 to the upper surface (opening) of the box portion 57. Then, it is placed inside and fitted into the opening (upper surface) portion of the box portion 58, and the fitting portion between the lid portion 58 and the box portion 57 is thermally welded by heat sealing.

  The heat-sealing resin of the box portion 57 and the heat-welding resin of the lid portion 58 are melted by heating and pressurization by the heat sealer, and the fitting portion between the box portion 57 and the lid portion 58 is a gap by the resin that solidifies after heat radiation. It is sealed without. An inlet for electrolytic solution is formed in the container 52 in advance, and the inlet is sealed with a sealing material or the like after the electrolytic solution is injected.

  By such a process, as a pair of electrode terminals, a terminal 52b having a first positive electrode bonding surface X-1 and a second positive electrode bonding surface X-2, a first negative electrode bonding surface Y-1 and a second negative electrode bonding surface. The electric double layer capacitor 50 (electric storage device) including the terminal 53b having Y-2 can be easily and easily manufactured. The electric double layer capacitor 50 is provided with a gas vent valve (not shown) that keeps the internal pressure of the container below a predetermined level.

  8 and 9 show the power storage module M-2, which is assembled from a required number of power storage devices 50 (power storage cells). The required number of power storage cells 50 is divided into a plurality of power storage device groups 60. The number of storage cells in each group 60 is the same.

  The required number of energy storage cells 50 includes one direction in which the two surfaces of the container 52 face each other (a relative direction between the front surface 1 and the rear surface of the container 52) and a direction substantially perpendicular thereto (the relative direction between the left surface and the right surface 3 of the container 52). The storage cells adjacent to each other in the front-rear direction of the container 52 are connected in series by joining the first positive electrode bonding surface X-1 and the first negative electrode bonding surface Y-1. The storage cells adjacent to each other in the left-right direction of the container 52 are connected by joining the second positive electrode terminals X-2 or the second negative electrode joining surfaces Y-2.

  Between the storage cells adjacent in one direction (front-rear direction) of the container 52, the first positive electrode bonding surface X-1 of one power storage device 50 and the first negative electrode bonding surface Y-1 of the other power storage device 50 The joint surfaces of the different polarities are arranged in mirror symmetry with respect to the adjacent surfaces of the containers (the surface where the rear surface and the front surface 1 overlap or the surface where the front surface 1 and the rear surface overlap). Between the power storage devices adjacent to each other in the direction substantially orthogonal to the front-rear direction of the container 52 (the left-right direction of the container), the second positive electrode bonding surface X-2 or the second negative electrode bonding surface Y-2 of one power storage device 50 and the other The same polarity of the second positive electrode bonding surface X-2 or the second negative electrode bonding surface Y-2 of the electricity storage device 50 is an adjacent surface of the containers (a surface overlapping the left surface and the right surface 3 or a right surface 3). And the left surface are overlapped with each other).

  In this case, the electricity storage device 50 has two types of electrode terminals 53 different in arrangement because the negative electrode terminal 53b and the positive electrode terminal 53a are arranged at opposite corner portions (diagonal portions) of the upper surface (rectangle) of the container 52. Is used. The electrode terminals of the electricity storage device A are arranged in the same manner as in FIGS. The electrode terminal 53 of the electricity storage device B is arranged at a different diagonal from the electrode terminal 53 of the electricity storage device A. The storage cells 50 are alternately arranged in the front-rear direction and the left-right direction of the container 52.

  In this example, the right side of the two rows of power storage device groups 60 is such that the power storage cells 50 are arranged in the back-and-forth direction of the container 52 in the A-B-A-B-A-B direction. The storage cells 50 are lined up in the front-rear direction of the container 52 in B-A-B-A-B-A.

  Between A and B adjacent in the front-rear direction of the container 52, the first positive electrode bonding surface X-1 of A and the first negative electrode bonding surface Y-1 of B are adjacent surfaces of the containers (of the container 52 of A). The surface of the rear surface and the front surface of the B container 52 is mirror-symmetrical, and these are joined by welding. Between B-A adjacent in the front-rear direction of the container 52, the first positive electrode bonding surface X-1 of B and the first negative electrode bonding surface Y-1 of A are adjacent surfaces of the containers (of the container 52 of B). The rear surface and the front surface of the A container 52 overlap each other) and are mirror-symmetrical and are joined by welding.

  Between AB adjacent to the left-right direction of the container 52, the second negative electrode bonding surface Y-2 of A and the second negative electrode bonding surface Y-2 of B are adjacent surfaces of the containers (the left surface of the container of A). And the right surface 3 of the container B are mirror-symmetrical with respect to each other and are joined by welding. Between B-A adjacent in the left-right direction of the container 52, the second positive electrode bonding surface X-2 of B and the second positive electrode bonding surface X-2 of A are adjacent surfaces of the containers (the left surface of the B container). And the right surface 3 of the container of A are overlapped), and they are mirror-symmetrical and are joined by welding.

  Between A and B where the foremost part of the row of the storage cells 50 arranged in the front-rear direction of the container 52 is arranged in the left-right direction, the second negative electrode joint surfaces Y-2 of the electrode terminals 53 are joined together, and are arranged in the front-rear direction of the container 52. The line B-A in which the rearmost part of the row of the storage cells 50 is arranged in the left-right direction is a joint between the second positive electrode joint surfaces X-2 of the electrode terminals 53. When these same-polarity junctions serve as external terminals of the power storage module M-2, an external charge / discharge circuit (not shown) is connected to these homopolarity-joints. Are connected to each other in parallel with an external charge / discharge circuit.

  In the power storage module M-2, when the power storage devices 50 are arranged in the front-rear direction of the container 52, one first positive electrode bonding surface X-1 and the other first negative electrode bonding surface Y between the power storage devices adjacent in the direction are arranged. -1 is mirror-symmetrical with respect to the adjacent surfaces of the containers, and when the power storage devices 50 are arranged in the left-right direction of the container 52, the second negative electrode bonding surfaces Y-2 between the power storage devices adjacent in the direction or Since the first positive electrode bonding surfaces X-2 are mirror-symmetrical with respect to the adjacent surfaces of the containers, the bonding surfaces and containers having different polarities in the front-rear direction of the container 52 can be obtained simply by arranging the power storage devices 50 in the front-rear and left-right directions. The joint surfaces of the same poles overlap in the left-right direction of 52.

  Since these joints are welding of two sheets of metal plates (forming electrode terminals 53) when welding (for example, spot welding) is performed, welding is performed as compared with the conventional case of welding three by three. Due to the relationship with the heat transfer from the storage cell 50 to the storage element 51, the extra length required for the portion drawn out of the electrode terminal 53 does not have to be increased. Moreover, it becomes easy to obtain a favorable stable welded portion by welding two sheets. Further, the extra length required for the part drawn out of the electrode terminal 53 is not required to be large, and a bus bar is not required for connection between the power storage devices and between the power storage device groups. The (energization path at the time of charging / discharging) can be shortened efficiently, and the power loss (heating loss) at the time of charging / discharging can be greatly reduced.

  In FIG. 9, R ′ is the resistance of the electrode terminal of the storage cell, and each point a and each point b are between the second positive electrode bonding surfaces X-2 or the second negative electrode bonding surfaces Y-2 of the electrode terminal 53. By joining, the electrode terminals 53 are kept at the same potential. Each point c is only the bonding between the different polarities of the first positive electrode bonding surface X-1 and the first negative electrode bonding surface Y-1 of the electrode terminal 53. Accordingly, a configuration in which two storage cells 50 are connected in series in the front-rear direction of the container 52 (set) is a configuration (minimum unit circuit) in which two sets are connected in parallel in the left-right direction of the container 52. Three minimum unit circuits S (configuration in a circle in the drawing) are connected in series in the front-rear direction of the container 52.

  Also between the minimum unit circuits, the connecting surface between the positive terminals (the continuous connecting surface of the first positive electrode bonding surface of A and the first positive electrode bonding surface of B) and the connecting surface of the negative electrode terminals (the first negative electrode of A) The joining surface and the joining surface of the first negative electrode joining surface of B) are mirror-symmetric with respect to the adjacent surface of the containers adjacent in the front-rear direction.

  In each minimum unit circuit S, the both-ends voltage of the AB series path (enclosed by a small ellipse) and the both-ends voltage of the B-A series path (enclosed by a small ellipse) are leveled (equalized). Therefore, variation in the terminal voltage of the electricity storage device due to charge / discharge or the like can be reduced.

When the potential difference occurs between the both-end voltage of the AB series path and the both-end voltage of the B-A series path, the junction between the second cathode joining faces or the second anode joining faces has a higher potential. However, if the two potentials are the same, no current flows, and the current that flows due to the potential difference between the two is very small. When the combined resistance R2 excluding the internal resistance R _X of the electricity storage device without adding the resistance of the junction between the negative electrode bonding surfaces is calculated, R2 = 6 · R ′.

When the combined resistance R1 of the present application is compared with the conventional combined resistance R0 (see the figure), the resistance R ′ of the electrode terminal 53 of the present application is smaller than the resistance _RA of the conventional electrode terminal 113, and A resistor (4 · R _C + 4R _D + R _E ) is also unnecessary. As a result, the combined resistance R2 of the present application can be significantly reduced as compared with the conventional combined resistance R0. In the electric double layer capacitor in which the power storage device 50 has a high output density, the combined resistance R1 is greatly reduced, which has a great effect of reducing the power loss associated with charge / discharge and the heat generation associated with charge / discharge.

  In the minimum unit circuit S, as shown in FIG. 10 and FIG. 11, between A and B where two storage cells 50 are connected in series, and between B and A where two storage cells 50 are connected in series. It is conceivable to use a conductive member 22 for connecting the two. The conductive member 22 maintains the same potential between the joint between the different polarities of the electrode terminal 53 in AB and the joint between the different polarities of the electrode terminal 53 in B-A. In other words, since the terminal voltages of A and B, which are bounded by the ellipse small circles in FIG. 11, are leveled (equalized), compared to the case of FIG. 8 and FIG. Variations in terminal voltage can be minimized.

  FIGS. 12 to 18 show modifications of the second embodiment. In the power storage module M-3 in FIG. 12, the power storage device group is configured in three rows in order to increase the power storage capacity. The power storage module M-4 in FIG. 13 includes power storage device groups arranged in four rows in order to further increase the power storage capacity.

  In the power storage module M-3, the power storage device group 60a is increased by one column to the power storage module M-2 in FIG. 8 and FIG. 9 (hereinafter simply referred to as the standard module RM). In the power storage device group 60a, two types of power storage devices 50 (power storage cells) are arranged in the back-and-forth direction of the container 52 in the A-B-A-B-A-B direction, and the power storage device group 60a (additional) is added to the left side of the standard module RM. Are arranged so that the right surfaces of the storage device groups) overlap.

  Even in the adjacent surface of the standard module RM and the power storage device group 60a (the surface where the left surface of the standard module RM and the right surface of the power storage device group 60a overlap), the joint surfaces of both electrode terminals 53 are mirror-symmetric, Bonding between them can be performed easily and efficiently.

  In FIG. 12, reference numeral 71 denotes a joint between the electrode terminals 53 positioned at both ends in the front-rear direction of the power storage device group 60 a and the same polarity of the electrode terminals 53 positioned at both ends in the front-rear direction of each power storage device group 60 of the standard module RM. The bus bars are connected to each other with the same polarity, and these joints can be easily and efficiently processed because two-layer welding is sufficient.

  The power storage module M-4 in FIG. 13 is a combination of two standard modules RM. The right and left surfaces of the standard module RM-2 overlap with the left or right surface of the standard module RM-1, and the adjacent surfaces of the standard modules RM (in the illustrated case, the left surface of the standard module RM-1 and the standard module RM- 2), the joint surfaces of the electrode terminals 53 are mirror-symmetric. Reference numeral 72 denotes a bus bar that connects joints of the same polarity of the electrode terminals 53 located at both ends in the front-rear direction of each standard module RM.

FIG. 14 shows a circuit configuration of the power storage module M-4, where R ′ is the resistance of the electrode terminal 53 of the power storage cell 50, and R _E ′ is the resistance of the buzz bar 72.

  Each standard module RM includes a plurality (three in this example) of minimum unit circuits S (configuration in a circle in the figure). However, by joining RM-1 and RM-2, A minimum unit circuit S that shares one storage cell 50 of each of the minimum unit circuits S one by one between the two minimum unit circuits S arranged in the front-rear direction and the two minimum unit circuits S arranged in the front-rear direction of RM-2. I can do it. For this reason, equalization (leveling) of voltages applied to the minimum unit circuit S is chained beyond the range of the minimum unit circuit S.

  In each minimum unit circuit S, the voltage between both ends of a set in which two storage cells 50 are connected in series is leveled (equalized). When attention is paid to one storage cell 50, a plurality of minimum unit circuits S Since the voltage leveling (equalization) of the voltage acting on the voltage and the leveling action of the voltage acting on the plurality of minimum unit circuits S are affected, if this chain reaches the entire M-4, the individual storage cells It is also possible to equalize (equalize) the terminal voltages.

  FIG. 15 shows another modification. The power storage module M-5 is composed of two standard modules RM. These standard modules RM-1 and RM-2 are arranged in two upper and lower stages in order to halve the installation surface. Each standard module RM is assembled in such a manner that the protruding surface of each electrode terminal 53 is translated upward and downward, and in the upper and lower two-stage standard module RM, connecting surfaces of different polarities of the electrode terminal 53 appearing on the right surface ( A continuous surface of the second positive electrode bonding surface X-2 and the second negative electrode bonding surface Y-2) A to C are connected to each other via a bus bar 73a extending in the vertical direction, and the different polarities of the electrode terminal 53 appearing on the left surface. The connecting surfaces D to F (continuous surfaces of the second positive electrode bonding surface X-2 and the second negative electrode bonding surface Y-2) are connected to each other via a bus bar 73b extending in the vertical direction.

  In each standard module RM, a bus bar 74a in which connecting surfaces of the same polarity of electrode terminals 53 appearing on the front surface (continuous surface of the first negative electrode bonding surface Y-1 and the first negative electrode bonding surface Y-1) extend in the vertical direction. The bus bar 74b is connected to each other, and the connecting surfaces of the same polarity of the electrode terminals 53 appearing on the rear surface (continuous surfaces of the first positive electrode bonding surface X-1 and the first positive electrode bonding surface X-1) extend in the vertical direction. The external terminals of the power storage module M-5 are formed by these buzz bars 74a and 74b.

  FIG. 16 shows a circuit configuration of the power storage module M-5, and each standard module RM includes a plurality (three in this example) of minimum unit circuits S (configuration in a circle in the drawing). Are connected to the connecting surfaces A to C and connecting surfaces D to F of the electrode terminal 53 by the bus bars 73a and 73b, respectively, and the two minimum unit circuits S arranged in the front-rear direction of the RM-1 and the front and rear of the RM-2. Since the minimum unit circuit S that shares one storage cell 50 of each of the minimum unit circuits S between two minimum unit circuits S arranged in the direction can be formed on both sides of M-5, the range of the minimum unit circuit S is The voltage leveling (leveling) effect can be exerted on the entire M-5.

  In addition, in order to equalize the terminal voltage 53 of each of the storage cells constituting M-5, the conductive member (see 22 in FIG. 10) can be used to connect between the storage cells of the minimum unit circuit S (between A-B and B-A). It is also conceivable to connect each other.

  In FIG. 16, R ′ is the resistance of the electrode terminal of the electricity storage cell 50, and the combined resistance of M-5 is markedly increased by the increase in the number of electricity storage device groups 60 compared to M-2 (see FIG. 20). Becomes smaller.

  As for the bus bars 73a and 73b, the connecting surfaces A to C and the connecting surfaces D to F are connected to the same potential. It is also possible to replace the conductive member 22).

  FIG. 17 shows another modification example, and the power storage module M-6 includes two standard modules RM. In these standard modules RM-1 and RM-2, the projecting surfaces of the electrode terminals 53 are combined face to face in order to improve volumetric efficiency (increase the storage capacity per unit volume).

  The projecting end surface of the electrode terminal 53 of the RM-1 and the projecting end surface of the electrode terminal 53 of the RM-2 are arranged mirror-symmetrically with respect to these facing surfaces, and the connecting surfaces A to C of the electrode terminals are connected to each other. The surfaces D to F are connected to each other through the bus bar 74. 75 is a bus bar that joins the connecting surfaces of the same polarity of the electrode terminals 53 before and after M-6, and forms an external terminal of M-6.

  In the power storage module M-6, two standard modules RM are combined with the protruding surfaces of the electrode terminals 53 facing each other, so that the bus bars 74 and 75 can be shortened, and volume efficiency can be improved.

  The bus bars 73a and 73b in FIG. 15 and the bus bar 74 in FIG. 17 connect the connection surfaces A to C and the connection surfaces D to F to the same potential, and the wiring is simple within the allowable resistance range. It is also possible to replace the electric wire with a small-diameter cross section (conductive member 22 in the figure).

  13 to 17, the standard module RM uses the power storage module M-2 of FIG. 8, but the power storage module M-3 of FIG. It is also conceivable to configure the power storage module M-7.

  The arrangement and connection configuration of the electrode terminals according to the present invention are not limited to application to electric double layer capacitors and lithium batteries, and can be widely applied to various power storage devices that can be repeatedly charged and discharged.

DESCRIPTION OF SYMBOLS 10,50 Power storage device 13,53 Electrode terminal M-1 to M-7 Power storage module X Positive electrode bonding surface Y Negative electrode bonding surface X-1 First positive electrode bonding surface Y-1 First negative electrode bonding surface X-2 Second positive electrode bonding Surface Y-2 Second negative electrode bonding surface 22 Conductive member

Claims (8)

  In a power storage module including a required number of power storage devices, the required number of power storage devices are divided into a plurality of power storage device groups, and the same number of power storage devices in each group are connected in series by joining electrode terminals, and a plurality of power storage device groups Are connected in parallel to each other, and each power storage device includes a power storage element for storing electric charge, a container for storing the power storage element, and a pair of electrode terminals connected to the positive electrode side and the negative electrode side of the power storage element, A positive electrode terminal in which the outer shape of the container is formed into a polygon including two surfaces facing in one direction, and has a positive electrode joining surface that is substantially flush with one of the two surfaces facing in one direction of the container as a pair of electrode terminals. And a negative electrode terminal having a negative electrode joint surface substantially flush with the other of the two surfaces.   The same number of power storage devices in each group are arranged in one direction of the container, and the pair of electrode terminals includes a joint surface of one positive electrode terminal or negative electrode terminal of the power storage device adjacent in one direction of the container, and the other The negative electrodes of the first electrode terminal or the bonding surface of the positive electrode terminal are arranged in mirror symmetry with respect to a surface adjacent to the containers in one direction, and the electricity storage devices arranged in the one direction are different from each other in the mirror symmetry. The power storage module according to claim 1, wherein the power storage modules are connected by bonding of bonding surfaces of the electrodes.   3. The power storage module according to claim 1, further comprising: a conductive member that connects a plurality of power storage device groups connected in parallel to the charge / discharge circuit at the same position between the power storage devices. .   In a power storage module including a required number of power storage devices, the required number of power storage devices are divided into a plurality of power storage device groups, and the same number of power storage devices in each group are connected in series by joining electrode terminals, and a plurality of power storage device groups Are connected in parallel to each other, and each power storage device includes a power storage element for storing electric charge, a container for storing the power storage element, and a pair of electrode terminals connected to the positive electrode side and the negative electrode side of the power storage element, An outer shape of the container is formed in a polygon including two surfaces facing in one direction and two surfaces facing in a direction substantially perpendicular to the two surfaces facing in the one direction, and the container is used as a pair of electrode terminals. A positive electrode terminal having a first positive electrode bonding surface substantially flush with one of the two surfaces facing in one direction, and a negative electrode terminal having a first negative electrode bonding surface substantially flush with the other of the two surfaces. The one-way to the positive terminal The second positive electrode joining surface that is substantially flush with one of the two surfaces facing in the direction substantially orthogonal to the two opposing surfaces, and substantially the same as the other of the two surfaces facing in the direction substantially perpendicular to the two surfaces of the negative electrode terminal. A power storage module, wherein a second negative electrode bonding surface is formed.   The same number of power storage devices in each group are arranged in one direction of the container, the plurality of power storage device groups are arranged in a direction substantially orthogonal to the one direction of the container, and the pair of electrode terminals is one of the containers. Different polarities of one first positive electrode bonding surface or first negative electrode bonding surface of the electricity storage device adjacent in the direction and the other first negative electrode bonding surface or first positive electrode bonding surface are adjacent in one direction between the containers. The storage devices arranged in a mirror symmetry with respect to the surface to be aligned and connected in the one direction are connected by joining the joining surfaces of the different polarities that are mirror-symmetric and are adjacent to each other in a direction substantially orthogonal to the one direction of the container. In the direction in which the same polarity of one second positive electrode bonding surface or second negative electrode bonding surface of the electricity storage device and the other second negative electrode bonding surface or second positive electrode bonding surface is substantially orthogonal to one direction of the containers. Arranged mirror-symmetrically with respect to adjacent surfaces , The electric storage device adjacent to the one direction in a direction substantially perpendicular to, the power storage module according to claim 4, wherein connected by bonding the bonding surfaces of the same poles to be mirror-symmetric, characterized in that.   A plurality of power storage device groups are connected to each other at the junctions between the power storage devices arranged in one direction of the container of the power storage device groups on both sides arranged in a direction substantially orthogonal to the one direction of the container. The power storage module according to claim 4, further comprising a conductive member.   An electrical storage device comprising: an electrical storage element that stores electric charge; a container that houses the electrical storage element; and a pair of electrode terminals that are connected to the positive electrode side and the negative electrode side of the electrical storage element. The two surfaces facing each other in one direction as a pair of electrode terminals are formed into a polygon including two surfaces facing each other and two surfaces facing substantially perpendicular to the two surfaces facing one direction. A positive electrode terminal having a first positive electrode bonding surface substantially flush with one of the two, and a negative electrode terminal having a first negative electrode bonding surface substantially flush with the other of the two surfaces. The second positive electrode joining surface that is substantially flush with one of the two surfaces facing in the direction substantially orthogonal to the two surfaces facing to each other, and the other of the two surfaces facing in the direction substantially perpendicular to the two surfaces on the negative electrode terminal. Each of the first negative electrode bonding surfaces is formed.   When the plurality of power storage devices are arranged in one direction of the container, the pair of electrode terminals includes one first positive electrode bonding surface and the other first negative electrode bonding of power storage devices adjacent to the container in one direction. When the plurality of power storage devices are arranged in a direction substantially orthogonal to the one direction of the container, the different polarities of the surface are arranged in a mirror-symmetric manner with respect to the surface adjacent to the one direction of the containers. The same polarity of one of the second positive electrode bonding surface or the second negative electrode bonding surface and the other negative electrode terminal or the bonding surface of the positive electrode terminal of the electricity storage devices adjacent to each other in a direction substantially orthogonal to the one direction is between the containers. 8. The electricity storage device according to claim 7, wherein the electricity storage device is arranged in mirror symmetry with respect to a surface adjacent to a direction substantially orthogonal to one direction as a boundary.