JP2012142095A - Secondary battery, control system for secondary battery, and lease system for secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a secondary battery which can reduce manufacturing cost even when the secondary battery has a plurality of power storage elements, and by which electrolytic solution is made to be infiltrated quickly inside an electrode group provided in each of the power storage elements, and which has a good usability and high convenience, and to provide a control system for a secondary battery that enables efficient use of the plurality of power storage elements, and a highly convenient lease system for a secondary battery.SOLUTION: A plurality of power storage elements are arranged on the same plane of an exterior case 11 at a predetermined interval L1 in an insulation state, and positive and negative external terminals (6Aa-6Bb) corresponding to the respective power storage elements are provided respectively. By configuring to detect abnormalities of the respective power storage elements via a controller 21 connected with the respective external terminals via voltage detection lines 22 (22A and 22B), a control system electrically disconnecting a connector 24 of the power storage element in which abnormalities are detected is provided. By connecting with an Internet network 28 via a communication unit 27, a lease system that can communicate abnormality information is provided.

Description

  The present invention relates to a secondary battery, and more particularly to a stacked secondary battery in which a plurality of positive and negative electrode plates are stacked, a control system for the secondary battery, and a lease system for the secondary battery.

  In recent years, lithium secondary batteries have been used as power source batteries for portable electronic devices such as mobile phones and notebook computers because they have a high energy density and can be reduced in size and weight. Further, since the capacity can be increased, it has been attracting attention as a motor drive power source for electric vehicles (EV) and hybrid electric vehicles (HEV), and a storage battery for power storage.

  In the lithium secondary battery, an electrode group in which a positive electrode plate and a negative electrode plate are arranged opposite to each other with a separator interposed therebetween is housed in an outer case constituting a battery can, filled with an electrolyte, and positive electrode current collectors of a plurality of positive electrode plates A positive current collecting lead coupled to the tab; a positive external terminal electrically connected to the positive current collecting lead; a negative current collecting lead coupled to the negative current collecting tabs of the plurality of negative electrode plates; and the negative current collecting lead. It is set as the structure provided with the negative electrode external terminal electrically connected with an electrical lead.

  As the electrode group, a wound type and a laminated type are known. The wound electrode group has a configuration in which a separator is interposed between a positive electrode plate and a negative electrode plate, and is integrally wound. The laminated electrode group has a positive electrode plate and a negative electrode plate interposed via a separator. It is the structure which laminated | stacked multiple layers.

  In a lithium secondary battery including a stacked electrode group, an electrode group in which a plurality of layers of a positive electrode plate and a negative electrode plate are stacked via a separator is housed in an outer case and filled with a non-aqueous electrolyte, respectively. A positive current collecting lead connected to the positive current collecting tab of the positive electrode plate, an external terminal electrically connected to the positive current collecting lead, and a negative current collecting lead connected to the negative current collecting tab of the negative electrode plate And an external terminal electrically connected to the negative electrode current collecting lead.

  For this purpose, a normal secondary battery accommodates one electrode group in one battery can and is provided with one positive external terminal and one negative external terminal. In addition, in order to produce a large-capacity secondary battery, when the same positive and negative electrode materials are used, the area of the positive electrode plate and the negative electrode plate is increased, the coating amount per unit area is increased, and the number of layers is increased. It is necessary to increase the amount of electrolyte solution to be filled in accordance with the amount of active material.

  However, in a configuration in which a large-sized battery can is provided with a set of power storage elements (a power generation / power storage unit including an electrode group and a current collecting lead), if a foreign object is mixed during the production of the laminate, If an active material region having a large area is formed on an electric body, material loss due to a short circuit or the like increases.

  On the other hand, if the area exceeds a certain level, it is not preferable in the conventional liquid injection / impregnation method because it takes time until the central portion is filled with the electrolytic solution. In addition, when the vacuum injection is performed under a high vacuum so that the electrolytic solution can easily penetrate, there is a problem that the time until a predetermined degree of vacuum is reached becomes long and the equipment cost becomes high.

  In addition, in order to increase the capacity while aiming for miniaturization, a stack type battery in which power storage elements (power generation elements) are stacked in two upper and lower stages is known (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 2003-257408

  If the plane area of the stacked electrode group is increased in order to increase the capacity of the power storage element, it will be bent during transportation, causing a problem in handling. If the handling property is deteriorated, the yield is deteriorated due to a short circuit or the like, which causes a material loss and increases the manufacturing cost.

  In addition, it is possible to increase the capacity as a configuration in which a plurality of power storage elements are incorporated in a common battery can by overlapping power storage elements of a predetermined size. However, simply superimposing them causes problems that the time for allowing the electrolyte to penetrate to the center of the electrode group becomes long, or that the electrolyte cannot be sufficiently penetrated to the center.

  Therefore, when a plurality of electrode groups are incorporated in a common battery can, a configuration in which the electrolyte solution can permeate all of the plurality of electrode groups in a time sufficient for the electrolyte solution to permeate the single electrode group is preferable. . In addition, in order to effectively use each power storage element, each electrode group is provided with an external terminal, and can be used individually or simultaneously in series and is a control system. It is preferable.

  In addition, when used as a power storage battery for home use, it is easy to manage a secondary battery including a plurality of power storage elements by immediately reporting failure information of each power storage element, and a user-friendly secondary battery It is required to construct a leasing system.

  Therefore, in view of the above problems, the present invention reduces the manufacturing cost even for a secondary battery including a plurality of power storage elements, and allows the electrolytic solution to quickly penetrate into the electrode group of each power storage element. Providing a secondary battery that is easy to use and highly convenient, and provides a secondary battery control system that enables efficient use of multiple power storage elements. The purpose is to provide a leasing system.

  In order to achieve the above-mentioned object, the present invention accommodates a plurality of power storage elements each including an electrode group in which a plurality of layers of a positive electrode plate and a negative electrode plate are laminated via a separator in a battery can and is filled with an electrolyte solution. A secondary battery, wherein a plurality of power storage elements are arranged side by side at a predetermined interval on the same plane of an outer case constituting the battery can, and positive and negative external terminals corresponding to the power storage elements are respectively provided. It is characterized by providing.

  According to this configuration, since the plurality of power storage elements are arranged in parallel on the same plane of the outer case at a predetermined interval, the electrolyte solution does not become thicker in the thickness direction, and the electrolyte solution can be simultaneously permeated into the plurality of electrode groups. The injection cost can be reduced. In addition, since a large-area electrode is configured by combining a plurality of power storage elements, the handling performance of each power storage element is improved, and the probability of causing adverse effects such as a short circuit is reduced, and the manufacturing cost is reduced. Can do. Further, since the positive and negative external terminals are provided for each of the plurality of power storage elements, a secondary battery that is convenient and highly convenient can be obtained.

  According to the present invention, in the secondary battery having the above-described configuration, the predetermined interval is set to a width that does not hinder the fluidity of the electrolytic solution. According to this configuration, even in a configuration in which a plurality of electrode groups are arranged side by side on the same plane, the electrolyte solution can be simultaneously infiltrated into each electrode group, and the time for filling the battery can with the electrolyte solution can be shortened. be able to.

  According to the present invention, in the secondary battery having the above-described configuration, the storage elements arranged in parallel are electrically insulated from each other. According to this structure, even if it is the structure with which the same electrolyte solution was filled in the same battery can, it can each be used as an individual electrical storage element, without the adjacent electrical storage elements having influence.

  In the secondary battery having the above-described configuration, the present invention is characterized in that a spacer made of an insulating member having a predetermined width is disposed between the power storage elements arranged in parallel. According to this configuration, adjacent power storage elements can be reliably maintained in an insulating state.

  According to the present invention, in the secondary battery having the above-described configuration, a spacer made of an insulating member having a predetermined thickness is disposed between the storage elements arranged side by side and between each storage element and the inner wall of the battery can. It is characterized by that. According to this configuration, each power storage element can be reliably maintained in an insulated state individually and with respect to the battery can.

  Further, in the secondary battery having the above-described configuration, the present invention is characterized in that the spacer is interposed between the upper surface side and the lower surface side of the power storage element, and the power storage element is sandwiched between the upper and lower spacers. It is said. According to this configuration, by pressing the power storage element through the spacer made of an insulating member, the contact distance between the electrodes can be maintained at a predetermined contact distance, and a predetermined battery capacity can be maintained.

  According to the present invention, in the secondary battery configured as described above, the power storage element includes a rectangular active material region having a long side portion and a short side portion, and the active material region extends from the end of the long side portion to the short side. The distance to the bisector of the side is formed to be 100 mm or less. According to this configuration, when configuring a large-area electrode group, the size of one power storage element, the distance from the end of the long side to the bisector of the short side is 100 mm or less, It is possible to prevent the electrolyte solution from penetrating into the central portion of the electrode group from becoming too long, and to rapidly penetrate the electrolyte solution into the electrode group.

  According to the present invention, in the secondary battery having the above-described configuration, a voltage detection line is connected to the external terminal so that the battery capacity of each power storage element can be confirmed. According to this configuration, even in a configuration in which a plurality of power storage elements are accommodated in the same battery can, the battery capacity of each power storage element is confirmed individually via the voltage detection line connected to each external terminal. It is possible to detect whether or not each power storage element is normal.

  Further, the present invention provides a control system for a secondary battery according to any one of claims 1 to 8, wherein an external terminal and an external device provided in each of a plurality of power storage elements included in the secondary battery are electrically connected. A control unit having a function of detecting a malfunction of the storage element by recognizing the output voltage of the storage element through a connection part to be connected, switching control of the connection part, and a voltage detection line connected to the external terminal And when the control unit detects an abnormality, the connection part of the power storage element is electrically disconnected.

  According to this configuration, normality / abnormality of each power storage element can be confirmed via the control unit, and only normal power storage elements that exhibit a predetermined battery capacity can be obtained by separating the power storage elements that are confirmed as abnormal. It can be used and can be controlled to obtain a stable battery capacity. Therefore, it is possible to obtain a secondary battery control system that can efficiently use a plurality of power storage elements.

  Further, the present invention is the secondary battery leasing system according to any one of claims 1 to 8, wherein an external terminal and an external device provided in each of the plurality of power storage elements included in the secondary battery are electrically connected. A control unit having a function of detecting a malfunction of the storage element by recognizing the output voltage of the storage element through a connection part to be connected, switching control of the connection part, and a voltage detection line connected to the external terminal And a communication unit connected to the connection unit and capable of communicating with the Internet network, and when the control unit detects an abnormality, the abnormality information is sent to the user of the secondary battery via the communication unit. Simultaneously with the notification, the abnormality information and the management information are notified to the management company of the secondary battery via the Internet network. According to this configuration, information that the secondary battery malfunctions and falls below the specified capacity is communicated to the user (user), and at the same time, the information is communicated to the secondary battery management company, making management easier and easier to use. It is possible to construct a secondary battery leasing system that is well convenient.

  According to the present invention, on the same plane of the exterior case, a plurality of power storage elements are arranged in parallel at a predetermined interval, and a positive and negative external terminal corresponding to each power storage element is provided. Even secondary batteries equipped with power storage elements can reduce manufacturing costs, and can quickly infiltrate the electrolyte into the electrode group of each power storage element. A battery can be obtained. In addition, secondary battery control that makes it possible to efficiently use a plurality of power storage elements by detecting an abnormality of each power storage element via a voltage detection line connected to an external terminal and performing control to electrically disconnect You can get a system. In addition, a lease system for secondary batteries that is easy to manage, easy to use, and convenient by providing a lease system that immediately notifies the management company of information on secondary batteries that have malfunctioned via the Internet. Can be built.

1 is a schematic plan view showing a first embodiment of a secondary battery according to the present invention. It is a schematic plan view which shows 2nd embodiment of the secondary battery which concerns on this invention. It is a schematic plan view which shows 3rd embodiment of the secondary battery which concerns on this invention. It is a schematic side view which shows 4th embodiment of the secondary battery which concerns on this invention. 3 is a schematic explanatory diagram illustrating an electrode group of Example 1. FIG. 6 is a schematic plan view showing an electrode group of Comparative Example 1. FIG. It is a schematic plan view which shows 5th embodiment of the secondary battery which concerns on this invention. It is a disassembled perspective view of a secondary battery. It is a disassembled perspective view of the electrode group with which a secondary battery is provided. It is a perspective view which shows the completed product of a secondary battery. It is a schematic sectional drawing of an electrode group. It is a schematic explanatory drawing which shows the control system of Example A1. It is a schematic explanatory drawing which shows the control system of comparative example B1. It is a schematic explanatory drawing which shows the control system of comparative example B2. It is a schematic explanatory drawing which shows the control system of comparative example B3. The cycle characteristics in which separation control is performed with a capacity retention rate of 80% are shown. The cycle characteristics in which the separation control is performed with a capacity retention rate of 70% are shown. The cycle characteristics in which separation control is performed with a capacity retention rate of 60% are shown. The impedance measurement result which compared injection | pouring time is shown. It is a block diagram which shows the outline | summary of the lease system of a secondary battery.

  Embodiments of the present invention will be described below with reference to the drawings. Moreover, the same code | symbol is used about the same structural member, and detailed description is abbreviate | omitted suitably.

  A lithium secondary battery will be described as the secondary battery according to the present invention. For example, the lithium secondary battery RB1 according to this embodiment shown in FIG. 1 is a stacked secondary battery, in which a plurality of layers of a positive electrode plate and a negative electrode plate are stacked in a battery can 10 via a separator. It is the structure provided with two or more type | mold electrode groups 1 (1A, 1B). Further, by increasing the area of the electrode plate of each electrode group and increasing the number of stacked layers, a secondary battery having a relatively large capacity is obtained, and can be applied to a storage battery for electric vehicles, a storage battery for power storage, and the like.

  The electrode groups 1A and 1B are connected to different external terminals, respectively. The positive electrode current collecting lead 5Aa and the negative electrode current collecting lead 5Ab of the electrode group 1A are connected to the positive electrode external terminal 6Aa and the negative electrode external terminal 6Ab, respectively. The positive electrode current collecting lead 5Ba and the negative electrode current collecting lead 5Bb of the electrode group 1B are connected to the positive electrode external terminal 6Ba and the negative electrode external terminal 6Bb, respectively.

  Next, specific configurations of the stacked lithium secondary battery RB and the electrode group 1 will be described with reference to FIGS.

  As shown in FIG. 6, the stacked lithium secondary battery RB has a rectangular shape in plan view, and includes an electrode group 1 in which a positive electrode plate, a negative electrode plate, and a separator, each of which is rectangular, are stacked. Moreover, it accommodates in the battery can 10 comprised from the exterior case 11 and the cover member 12 which are provided with the bottom part 11a and the side parts 11b-11e, and is made into a box shape, and the side surface (for example, side part 11b, 11c is configured to perform charging / discharging from external terminals 11f (corresponding to the positive electrode external terminals 6Aa and 6Ba and the negative electrode external terminals 6Ab and 6Bb described above) provided on two opposing side surfaces of 11c.

  The electrode group 1 has a configuration in which a plurality of layers of a positive electrode plate and a negative electrode plate are laminated via a separator. As shown in FIG. 7, the positive electrode current collector 2b (for example, an aluminum foil) is coated with a positive electrode active material on both surfaces. The positive electrode plate 2 having the positive electrode active material layer 2a formed thereon and the negative electrode plate 3 having the negative electrode active material layer 3a formed of the negative electrode active material formed on both surfaces of the negative electrode current collector 3b (for example, copper foil) It is laminated through.

  Although the separator 4 insulates the positive electrode plate 2 and the negative electrode plate 3 from each other, lithium ions can be transferred between the positive electrode plate 2 and the negative electrode plate 3 through the electrolyte filled in the outer case 11. It has become.

Here, as the positive electrode active material of the positive electrode plate 2, oxides of lithium is contained (such as _{LiCoO 2, LiNiO 2, LiFeO 2} , LiMnO 2, LiMn 2 O 4) or a part of the transition metal in the oxide And a compound in which is substituted with other metal elements. Among these, in a normal use, if a material that can use 80% or more of lithium held in the positive electrode plate 2 for the battery reaction is used as the positive electrode active material, safety against accidents such as overcharge can be improved. Examples of such a positive electrode active material include a compound having a spinel structure such as LiMn ₂ O ₄ and LiMPO ₄ (M is at least one element selected from Co, Ni, Mn, and Fe). The compound etc. which have the olivine structure represented by these are mentioned. Especially, the positive electrode active material containing at least one of Mn and Fe is preferable from a viewpoint of cost. Furthermore, it is preferable to use LiFePO ₄ from the viewpoint of safety.

  Further, as the negative electrode active material of the negative electrode plate 3, a material containing lithium or a material capable of inserting / removing lithium is used. In particular, in order to have a high energy density, it is preferable to use a lithium insertion / extraction potential close to the deposition / dissolution potential of metallic lithium. A typical example is natural graphite or artificial graphite in the form of particles (scale-like, lump-like, fibrous, whisker-like, spherical and pulverized particles).

  In addition to the positive electrode active material of the positive electrode plate 2, and in addition to the negative electrode active material of the negative electrode plate 3, a conductive material, a thickener, a binder, and the like may be contained. The conductive material is not particularly limited as long as it is an electron conductive material that does not adversely affect the battery performance of the positive electrode plate 2 or the negative electrode plate 3. For example, carbon black, acetylene black, ketjen black, graphite (natural graphite, artificial graphite) ), Carbonaceous materials such as carbon fibers, conductive metal oxides, and the like can be used.

  As the thickener, for example, polyethylene glycols, celluloses, polyacrylamides, poly N-vinyl amides, poly N-vinyl pyrrolidones and the like can be used. The binder serves to hold the active material particles and the conductive material particles together, and includes a fluorine-based polymer such as polyvinylidene fluoride, polyvinyl pyridine and polytetrafluoroethylene, a polyolefin polymer such as polyethylene and polypropylene, Styrene butadiene rubber or the like can be used.

  Moreover, as the separator 4, it is preferable to use a microporous polymer film. Specifically, films made of a polyolefin polymer such as nylon, cellulose acetate, nitrocellulose, polysulfone, polyacrylonitrile, polyvinylidene fluoride, polypropylene, polyethylene, polybutene can be used.

  Moreover, it is preferable to use an organic electrolytic solution as the electrolytic solution. Specifically, as an organic solvent of the organic electrolyte, esters such as ethylene carbonate, propylene carbonate, butylene carbonate, diethyl carbonate, dimethyl carbonate, methyl ethyl carbonate, and γ-butyrolactone, tetrahydrofuran, 2-methyltetrahydrofuran, dioxane, dioxolane , Diethyl ether, dimethoxyethane, diethoxyethane, methoxyethoxyethane, and other ethers, dimethyl sulfoxide, sulfolane, methyl sulfolane, acetonitrile, methyl formate, and methyl acetate can be used. These organic solvents may be used alone or in combination of two or more.

Further, the organic solvent may contain an electrolyte salt. Examples of the electrolyte salt include lithium perchlorate (LiClO ₄ ), lithium borofluoride, lithium hexafluorophosphate, trifluoromethanesulfonic acid (LiCF ₃ SO ₃ ), lithium fluoride, lithium chloride, lithium bromide, and iodide. And lithium salts such as lithium and lithium tetrachloroaluminate. In addition, these electrolyte salts may be used independently and may be used in mixture of 2 or more types.

  The concentration of the electrolyte salt is not particularly limited, but is preferably about 0.5 to about 2.5 mol / L, and more preferably about 1.0 to 2.2 mol / L. When the concentration of the electrolyte salt is less than about 0.5 mol / L, the carrier concentration in the electrolytic solution is lowered, and the resistance of the electrolytic solution may be increased. On the other hand, when the concentration of the electrolyte salt is higher than about 2.5 mol / L, the dissociation degree of the salt itself is lowered, and there is a possibility that the carrier concentration in the electrolytic solution does not increase.

  The battery can 10 includes an outer case 11 and a lid member 12, and is made of iron, nickel-plated iron, stainless steel, aluminum, or the like. Further, in the present embodiment, as shown in FIG. 8, the battery can 10 is formed so that the outer shape is substantially a flat rectangular shape when the outer case 11 and the lid member 12 are combined. ing.

  The outer case 11 is a box shape having a bottom portion 11a having a substantially rectangular bottom surface and four side portions 11b to 11e erected from the bottom portion 11a, and the electrode group 1 is accommodated inside the box shape. To do. The electrode group 1 includes a positive current collecting lead coupled to a current collecting tab of the positive electrode plate and a negative current collecting lead coupled to the current collecting tab of the negative electrode plate, and is electrically connected to these current collecting tabs. External terminals 11 f are provided on the sides of the outer case 11. The external terminal 11f is provided, for example, at two locations on the opposite two side portions 11b and 11c. Reference numeral 10a denotes a liquid injection port from which an electrolytic solution is injected.

  After the electrode group 1 is accommodated in the outer case 11 and each current collecting lead is connected to an external terminal, the lid member 12 is fixed to the opening edge of the outer case 11. Then, the electrode group 1 is sandwiched between the bottom portion 11 a of the outer case 11 and the lid member 12, and the electrode group 1 is held inside the battery can 10. The lid member 12 is fixed to the exterior case 11 by, for example, laser welding. Further, the connection between the current collecting lead and the external terminal can be performed by using a conductive adhesive or the like in the case where the current collector lead is not attacked by the electrolytic solution other than welding such as ultrasonic welding, laser welding, and resistance welding.

  As described above, the secondary battery RB according to this embodiment includes the electrode group 1 in which a plurality of layers of the positive electrode plate 2 and the negative electrode plate 3 are stacked via the separator 4, and the electrode group 1 is accommodated and filled with an electrolyte solution. An outer case 11 to be provided, an external terminal 11f provided on the outer case 11, positive and negative current collecting leads electrically connecting the positive and negative electrode plates and the external terminal 11f, and a lid member 12 attached to the outer case 11 It is the structure provided with.

  For example, as shown in FIG. 9, the electrode group 1 accommodated in the outer case 11 includes a positive electrode plate 2 in which a positive electrode active material layer 2a is formed on both surfaces of a positive electrode current collector 2b, and both surfaces of a negative electrode current collector 3b. The negative electrode plate 3 on which the negative electrode active material layer 3a is formed is laminated via the separator 4, and the separator 4 is disposed on both end faces. Moreover, it is good also as a structure which replaces with the separator 4 of both end surfaces, and winds the resin film of the same material as this separator 4, and coat | covers the electrode group 1 with the resin film which has insulation. In any case, the upper surface of the laminated electrode group 1 has a configuration in which members having electrolyte permeability and insulating properties are laminated. Therefore, the lid member 12 can be brought into direct contact with this surface, and can be pressed with a predetermined pressure via the lid member.

  In addition, in a secondary battery configured to accommodate a plurality of electrode groups in one battery can, it is preferable that each electrode group is fixed at a predetermined position so that the electrode groups do not contact each other, and installed at a predetermined interval. For example, it is preferable to electrically insulate the electrode groups from each other.

  Moreover, even in a configuration in which a plurality of electrode groups are accommodated in one battery can, it is preferable to reduce the time for filling the electrolyte solution in order to reduce the manufacturing cost, so that the electrolyte solution can easily flow. It is important to arrange a plurality of electrode groups. Next, a configuration example of a secondary battery including a plurality of electrode groups 1 (1A, 1B...) Will be described with reference to FIGS.

  FIG. 1 shows a secondary battery RB1 including two electrode groups 1A and 1B. The electrode group 1A includes a positive electrode external terminal 6Aa connected to a positive electrode current collecting lead 5Aa in which a plurality of positive electrode tabs are integrated and a negative electrode connected to a negative electrode current collecting lead 5Ab in which a plurality of negative electrode tabs are integrated. It is electrically connected to the external terminal 6Ab. In the electrode group 1B, the positive current collecting lead 5Ba is connected to the positive external terminal 6Ba, and the negative current collecting lead 5Bb is connected to the negative external terminal 6Bb.

  In other words, the electrode group (that is, the power storage element) can be charged / discharged through each external terminal provided so as to protrude outward from the battery can 10. In addition, since each of the electrode groups 1A and 1B includes an external terminal, each electrode group serves as an independent power storage element.

  For this reason, each power storage element can be used individually or in series, and can be used at the same time, so that each power storage element can be used effectively. That is, a secondary battery that is convenient and highly convenient can be obtained.

  Moreover, since it is preferable to electrically insulate each electrical storage element from each other, the respective electrode groups are installed with a predetermined distance therebetween. In addition, the separation distance L1 is preferably a separation distance that does not impede the fluidity of the electrolytic solution when the electrolytic solution is injected and allows the electrolytic solution to flow easily.

  Two or more power storage elements may be accommodated in the same battery can. For example, as illustrated in FIG. 2, the secondary battery RB <b> 2 that accommodates n power storage elements is used. Since the secondary battery RB2 includes n power storage elements, the secondary battery RB2 includes n electrode groups 1A, 1B,..., 1N, and n × 2 external terminals.

  As shown in the figure, since a plurality of power storage elements are arranged on the same plane, they do not overlap in the thickness direction of the electrode group, and do not impede the permeability of the electrolytic solution into the electrode group, and perform electrolysis at the same time. The liquid can be infiltrated. Further, by setting the separation distance between the respective electrode groups to the separation distance L1 at which the electrolyte solution easily flows, the electrolyte solution can be rapidly penetrated into the electrode group.

  Since this secondary battery RB2 has a configuration in which n power storage elements are provided with n positive external terminals and n negative external terminals, they are connected in series with a low-power diverse use type that uses each individually. Thus, it is possible to use a plurality of methods of a high power single use type that is used at the same time and a medium power type that is a combination of a plurality of intermediate power storage elements. That is, it becomes a preferable form as a secondary battery that is convenient and highly convenient.

  Moreover, it is good also as a structure which maintains the separation distance L1 where an electrolyte solution flows easily by interposing the spacer of predetermined width between the electrical storage elements arranged in parallel. Further, when the spacer is interposed, the spacer is preferably an insulating member. As described above, by disposing an insulating member having a predetermined width between the storage elements arranged in parallel, it is possible to reliably prevent a short circuit between the storage elements and maintain a separation distance L1 at which the electrolyte easily flows. Is preferable. An embodiment in which this insulating member is interposed will be described with reference to FIGS. 3A and 3B.

  A secondary battery RB3A shown in FIG. 3A has a configuration in which two electrode groups 1A and 1B are provided in a battery can 10, and a spacer 7A that maintains a predetermined separation distance L1 between these electrode groups is interposed. It is what.

  The spacer 7A may be a flat plate member having a predetermined width corresponding to the separation distance L1. However, as shown in the figure, the spacer 7A has a convex shape in which the predetermined width portion protrudes in a convex shape, and only the separation distance between the electrode groups 1A and 1B. The shape which prescribes | regulates the distance from the wall surface of a battery can is also preferable. At this time, it is preferable to provide a recess that serves as a passage for the electrolytic solution on the surface in contact with the bottom of the outer case 11 so that the electrolytic solution can be rapidly permeated.

  Further, it is preferable that the electrode groups 1A and 1B are defined at predetermined positions in the battery can by interposing spacers 7B at the four corners of the battery can 10 as well. Each of these spacers 7A and 7B is preferably made of an insulating member. Furthermore, it is more preferable that it is made of a foam material having stretchability and flexibility in addition to insulation. In addition, it is preferable that these spacers 7A and 7B are of an integrated type because the spacers do not move individually by an external force such as vibration.

  The electrode groups 1A and 1B can be electrically insulated reliably through the spacer 7A made of an insulating member. Moreover, the electrical insulation between the electrode groups 1A and 1B and the battery can 10 can be satisfactorily achieved through the spacer 7B made of an insulating member in the same manner as the spacer 7A.

  A secondary battery RB3B shown in FIG. 3B includes two electrode groups 1A and 1B in the battery can 10, and between the electrode groups (storage elements) arranged in parallel and between each electrode group and the battery can 10. A spacer made of an insulating member having a predetermined thickness is disposed between the inner wall and the inner wall. Further, as a spacer, a spacer 8A is provided on the electrode group mounting surface of the outer case 11 constituting the battery can 10, that is, on the lower surface side of the power storage element, and on the lower side of the lid member 12, that is, the upper surface of the power storage element. On the side, a power storage element is sandwiched between the upper and lower spacers with a spacer 8B interposed therebetween.

  With this configuration, each power storage element can be reliably maintained in an insulated state individually and with respect to the battery can. Further, by pressing the power storage element through the spacers 8A and 8B made of an insulating member, the contact distance between the electrodes can be maintained at a predetermined contact distance, and a predetermined battery capacity can be maintained.

  The spacer 8A may be a plate having an area corresponding to the bottom surface of each power storage element. The spacer 8B has a U-shaped frame shape that fits on the upper side of each power storage element, and exhibits a separation distance L1 between adjacent power storage elements when the spacer 8B is mounted on each adjacent power storage element. The member thickness is preferable.

  The depth into which the spacer 8B is fitted may be enough to form the groove 9A through which the electrolytic solution flows between the electricity storage elements. Moreover, it is preferable that it is the shape which forms the groove | channel 9B into which electrolyte solution flows between the inner walls of the battery can 10. FIG.

  With this configuration, even a secondary battery including a plurality of power storage elements is preferable because the electrolyte solution can rapidly penetrate into the electrode group of each power storage element.

  The spacers 7A, 7B, 8A, and 8B may be made of any material that can be insulated from the power storage elements and from the battery can, has a mechanical strength sufficient to fix the position of the power storage elements, and does not dissolve in the electrolyte. Polytetrafluoroethylene) and the like can be used.

  Further, the spacers 7A, 7B, 8A, 8B may be made of a material having electrolyte permeability. If it consists of a raw material which has electrolyte solution permeability, the permeability of the electrolyte solution to the electrode group 1 (1A, 1B) will become still better.

  Next, an experiment for confirming that the electrolytic solution can be rapidly infiltrated with the secondary battery according to the present embodiment will be described with reference to FIGS. 4A and 4B.

  A secondary battery RB4 shown in FIG. 4A is an example of the secondary battery according to the present embodiment, and has a longitudinal direction × short direction × depth, and has an internal dimension of 266 mm × 230 mm × 50 mm. In this battery can, two rectangular electrode groups 1A and 1B having a long side (W) of 200.5 mm and a short side (2H) of 110 mm are installed with a separation distance L1 of 5 mm apart. A procedure for manufacturing the electrode groups 1A and 1B will be described below.

(Example)
[Preparation of positive electrode plate]
LiFePO ₄ (90 parts by weight) as a positive electrode active material, acetylene black (5 parts by weight) as a conductive material, and polyvinylidene fluoride (5 parts by weight) as a binder are mixed, and N as a solvent is mixed. -Methyl-2-pyrrolidone was added as appropriate to disperse each material to prepare a slurry, and this slurry was uniformly applied on both sides of an aluminum foil (thickness 20 μm) as a positive electrode current collector and dried. It compressed with the roll press and cut | disconnected by predetermined size, and produced the plate-shaped positive electrode plate 2. FIG.

  Moreover, the size of the produced positive electrode plate was 185 mm × 105 mm (including an uncoated part 15 mm × 105 mm), the thickness was 230 μm, and 32 positive electrode plates 2 were used.

[Preparation of negative electrode plate]
Natural graphite (90 parts by weight) as a negative electrode active material and polyvinylidene fluoride (10 parts by weight) as a binder are mixed, and N-methyl-2-pyrrolidone as a solvent is appropriately added to each material. A slurry is prepared by dispersing, and the slurry is uniformly applied on both sides of a copper foil (thickness 16 μm) as a negative electrode current collector and dried, then compressed by a roll press, and cut into a predetermined size. A plate-like negative electrode plate 3 was produced.

  Moreover, the size of the produced negative electrode plate was 187 mm × 110 mm (including an uncoated part 14 mm × 110 mm), the thickness was 146 μm, and 33 negative electrode plates 2 were used.

  In addition, as a separator, 64 polyethylene films having a size of 177 mm × 110 mm and a thickness of 25 μm were produced.

[Preparation of non-aqueous electrolyte]
A non-aqueous electrolyte was prepared by dissolving 1 mol / L of LiPF ₆ in a mixed solution (solvent) in which ethylene carbonate (EC) and diethyl carbonate (DEC) were mixed at a volume ratio of 30:70.

[Production of battery cans]
As materials for the outer case and the lid member constituting the battery can, SUS304 plates were used, respectively. In addition, each of them has a thickness of 0.8 mm, a longitudinal direction × a lateral direction × depth, and an internal size of 266 mm × 230 mm × 50 mm battery can size. A secondary battery was produced. Moreover, in order to make a lid member closely_contact | adhere to the upper surface of an electrode group, it was set as the structure which uses the plate-shaped lid member which fits in the inside of a can instead of flat form. When the dish-shaped lid member is used, it is possible to prevent the lid member from moving when welding the lid member, and the welding operation is facilitated. Moreover, it can respond easily to the change of the thickness of the electrode group to accommodate by changing the amount of depressions of a dish shape. Furthermore, a dish shape is preferable because the strength of the lid member and the strength of the battery can can be improved.

[Assembly of secondary battery]
A positive electrode plate and a negative electrode plate are alternately laminated via a separator. At that time, 32 positive electrode plates, 33 negative electrode plates, and 64 separators were laminated so that the negative electrode plate was located outside the positive electrode plate, and this laminate was used a polyethylene film having the same thickness of 25 μm as the separator. Electrode groups 1A and 1B were constructed as a configuration for winding them.

  As described above, the size of the separator interposed between the positive and negative electrode plates is 177 mm × 110 mm, which is slightly larger than the positive electrode active material region (170 mm × 105 mm) and the negative electrode active material region (173 mm × 110 mm). It is. Thereby, the active material layer formed on the positive electrode plate and the negative electrode plate can be reliably coated. Moreover, the connection piece of the current collection member (current collection lead) was connected to the current collector exposed portion of the positive electrode and the current collector exposed portion of the negative electrode.

  The electrode groups 1A and 1B to which the current collecting leads are connected are accommodated in the outer case, the current collecting leads and the external terminals are connected to each other, the lid members are attached and sealed, and the nonaqueous electrolytic solution is injected under reduced pressure from the liquid injection hole. did. After the injection, the injection hole was sealed to produce a secondary battery RB4.

  A secondary battery RB5 shown in FIG. 4B is a comparative example in which one rectangular electrode group 1AB having a long side (W) of 200.5 mm × short side (4H) of 220 mm is installed in a battery can having the same capacity. In addition, the material, thickness, and the number of stacked layers of the positive electrode plate, the negative electrode plate, and the separator constituting each electrode group are the same, and the stacked thickness is the same. The only difference is that the area is doubled.

  As described above, the power storage element used as an example is a rectangle having a long side W of 200.5 mm and a short side 2H of 110 mm. Therefore, the power storage element according to this embodiment includes a rectangular active material region having a long side portion and a short side portion, and the active material region extends from the end of the long side portion to the bisector of the short side. It can be said that the distance H (shortest distance) is 100 mm or less.

  As described above, the comparative example 1 (corresponding to the secondary battery RB5) in which one large-area power storage member is accommodated in a battery can of the same size and two power storage members having a half area separated from each other by a predetermined distance are installed. The electrolyte solution injection time in Example 1 (corresponding to the secondary battery RB4) was measured and compared. The results are shown in Table 1.

  As shown in Table 1, in Comparative Example 1, the time for injecting the electrolyte took 8 hours (8H), but in Example 1 according to the present embodiment, it was revealed that the liquid can be injected in 3 hours (3H). . Although the area of the entire electrode plate is the same, it was found that the liquid injection time can be reduced to ½ or less by using a two-split type and setting them apart by a predetermined distance on the same plane.

  In this way, in the electricity storage element having a short side of 220 mm, the time for injecting the electrolyte solution becomes long. Therefore, the size of one electricity storage element is changed from the end of the long side to the bisector of the short side. By setting the distance (shortest distance) to 100 mm or less, it is possible to prevent the electrolyte solution from penetrating excessively into the central portion of the electrode group, and to rapidly infiltrate the electrolyte solution into the electrode group. That is, since the electrolyte solution penetrates into the active material region, the distance (shortest distance) from the end of the long side to the bisector of the short side is 100 mm or less. It can be said that it is preferable.

  Next, an embodiment in which a voltage detection line is connected to an external terminal will be described with reference to FIG.

  FIG. 5 shows the secondary battery RB6 in which the voltage detection lines 22 (22A and 22B) are connected to the external terminals 6Aa and 6Ab included in the electrode group 1A and the external terminals 6Ba and 6Bb included in the electrode group 1B, respectively. . These voltage detection lines 22 are input to the control unit 21 at once.

  The control unit 21 detects the voltage of the electrode group 1A via the voltage detection line 22 (22A) connected to the external terminals 6Aa and 6Ab, and estimates the power generation amount (discharge capacity) and the storage amount (charge capacity). The voltage of the electrode group 1B is detected via the voltage detection line 22 (22B) connected to the external terminals 6Ba and 6Bb, and the power generation amount (discharge capacity) and the storage amount (charge capacity) are estimated.

  In addition, the control unit 21 has a function of controlling switching of the connection unit 24 that electrically connects the external terminal and the external device (power use unit 26). The connection unit 24 is connected to the control unit 21 via the connection circuit 23 and is connected to the power use unit 26 via the connection circuit 25. Therefore, the battery capacity of each power storage element can be estimated based on the detected voltage via each voltage detection line 22 (22A, 22B). It is possible to perform control to be disconnected.

  With such a configuration, it becomes possible to determine whether or not each power storage element exhibits a normal battery capacity via the control unit 21, and only a normal power storage element is used in combination, Control that exerts electric power can be performed. In addition, for this reason, in a secondary battery having a configuration in which a plurality of power storage elements are accommodated integrally, even if a certain power storage element deteriorates or fails and does not exhibit normal battery capacity, the normal battery capacity Since it is possible to use an external device using other power storage elements exhibiting the above, the secondary battery is easy to use and highly convenient.

  In this way, even in a configuration in which a plurality of power storage elements are accommodated in one battery can, it is possible to use other normal power storage elements by performing control to quickly disconnect when an abnormal power storage element is detected. Therefore, the usable period of the battery can can be extended, and the effect of extending the life of the secondary battery is exhibited.

  Next, the present embodiment product in which two power storage elements are accommodated in a single battery can at a predetermined distance on a plane, each provided with an external terminal, and connected to a control unit using a voltage detection line (implemented) Example A1), a comparative product (Comparative Example B1) in which two storage elements are stacked one above the other in one battery can, each provided with an external terminal, and connected to the control unit using a voltage detection line, A comparative product (Comparative Example B2) in which two storage elements are accommodated in a single battery can at a predetermined distance apart on a plane, provided with a common external terminal, and connected to the control unit using a voltage detection line; Measurement of battery capacity retention using a comparative product (Comparative Example B3) in which one large power storage element is accommodated in one battery can and the external terminal is connected to the control unit using a voltage detection line The experiment that was performed will be described.

  In the experiment, Example A1, Comparative Example B1, and Comparative Example B2 were prepared using the electrode groups 1A and 1B included in the secondary battery RB4 described above, and one of the two power storage elements included in these was connected to a short-circuit factor element. This is a foreign matter mixing test in which a metal piece (aluminum rod having a diameter of 1 mm and a length of 10 mm) is mixed and charge / discharge is repeated, and the battery capacity retention rate is measured to examine cycle characteristics. However, in Comparative Example B1, metal pieces are mixed in the lower storage element. In Comparative Example B3, an experiment was performed in which the same metal piece was mixed in one large power storage element using the electrode group 1AB included in the secondary battery RB5.

  FIG. 10A shows an outline (plan view) of a control system using a secondary battery corresponding to Example A1, and FIG. 10B shows an outline (cross-sectional view) of a control system using a secondary battery corresponding to Comparative Example B1. 10C shows an outline (plan view) of a control system using a secondary battery corresponding to Comparative Example B2, and FIG. 10D shows an outline (plan view) of a control system using a secondary battery corresponding to Comparative Example B3. ). Moreover, the result of the experiment which measured the retention rate of the battery capacity to FIG. 11A-FIG. 11C is shown.

  In Example A1 shown in FIG. 10A, two battery elements (electrode groups 1A, 1B) are accommodated in a single battery can at a predetermined distance from each other, external terminals are provided for each, and voltage detection line 22 is provided. It connects to the control part 21 using. In Comparative Example B1 shown in FIG. 10B, two power storage elements (electrode groups 1A, 1B) are accommodated in a single battery can in a superposed manner, and external terminals are provided for each of them, and a voltage detection line 22 is used. It is connected to the control unit 21. In Comparative Example B2 shown in FIG. 10C, two power storage elements (electrode groups 1A, 1B) are accommodated in a single battery can at a predetermined distance apart from each other, provided with a common external terminal, and voltage detection line 22 It connects to the control part 21 using. Further, in Comparative Example B3 shown in FIG. 10D, one power storage element (electrode group 1AB) is accommodated in one battery can and connected to the control unit 21 via the voltage detection line 22 connected to the external terminal. .

  Each external terminal is connected to a charging / discharging device (installed in place of the power usage unit in FIG. 5) via the connecting portion 24 and the connecting circuit 25 shown in FIG. 5, and the charging / discharging device is connected to the connecting circuit. It is connected to the control unit 21 via 23. For this purpose, the connection circuit 25 becomes a charge / discharge circuit, and the battery capacity is measured while repeating the charge / discharge cycle via the charge / discharge device and the control unit 21, and the storage element mixed with the short-circuiting factor element is a predetermined predetermined value. When the capacity retention rate was exceeded, control was performed to disconnect the power storage element. Further, the predetermined capacity retention rates were set to three types of 60%, 70%, and 80%.

  FIG. 11A shows the result of an experiment in which control is performed when the capacity retention rate falls below 80%. In Example A1, one storage element that is determined to be abnormal when the capacity retention rate is 80% or less is separated. After that, it was found that the capacity retention rate of 45% was maintained until 1000 cycles. However, Comparative Examples B2 and B3 indicate that the entire power storage system is disconnected because there is only one set of external terminals.

  In Comparative Example B1, the capacity retention rate of 40% is maintained until about 600 cycles, but then gradually decreases. This is a configuration in which two power storage elements are overlapped. Therefore, it seems that the cycle characteristics are deteriorated due to the lack of the upper electrolyte, corresponding to the state where the power storage elements are thick. It is.

  FIG. 11B shows the result of an experiment in which the control is performed when the capacity retention rate falls below 70%. As is clear from this figure, Example A1 shows that the power storage system can be used for a long time. Yes. Moreover, although Comparative Example B1 can be used for a certain period of time, it can be seen that the battery capacity is gradually reduced as compared with Example A1.

  FIG. 11C shows the result of an experiment in which separation control is performed when the capacity retention ratio falls below 60%. When charging / discharging is repeated until the capacity retention rate is reduced to 60%, the power storage elements not mixed with foreign matters are gradually deteriorated, and therefore, the capacity retention rate tends to decrease also in Example A1 and Comparative Example B1. However, it is clear that Example A1 can extend the life.

  From the experimental results shown in FIG. 11A to FIG. 11C, a configuration according to this embodiment in which a plurality of power storage elements are arranged in parallel in an insulated state at a predetermined interval on the same plane, and external terminals are provided corresponding to the respective power storage elements. The secondary battery was found to be able to build a power storage system that can be used for a long time.

  Moreover, the electrolyte penetration check test by impedance measurement after electrolyte solution injection in Example A1 and Comparative Example B3 will be described with reference to FIG.

  If the electrolyte sufficiently penetrates between the electrodes of the storage element, the impedance between the electrodes decreases, so whether the electrolyte has penetrated to the inside of the storage element by measuring the impedance of the storage element via the external terminal Can be determined.

  In FIG. 12, the horizontal axis indicates the injection time (the injection time until reaching the target impedance in Comparative Example 3 is 100%), and the vertical axis indicates the measured impedance (unit mΩ). Further, the value at which the impedance measured in Comparative Example 3 was substantially constant was determined as the target impedance, and the time when the target impedance was reached was defined as the liquid injection time of Example 1.

  The impedance curve IP3 of Comparative Example B3 shown in the drawing reaches the target impedance at time T3. That is, the time T3 is the injection time of the comparative example B3. The impedance curve IP1 of Example A1 reaches the target impedance at time T1. That is, it can be seen that the time T1 is the injection time of Example A1, and is approximately 40% of the time T3 (corresponding to 1/2 or less).

  As described above, according to the present embodiment in which a plurality of power storage elements of a predetermined size are arranged side by side on the same plane of the outer case constituting the battery can, the time for injecting the electrolyte can be shortened. It became clear that there was.

  The secondary battery control system according to the present embodiment employed in Example A1 described above includes a connection unit 24 that electrically connects an external terminal and an external device provided in each of a plurality of power storage elements included in the secondary battery, A control unit 21 having a function of controlling the switching of the connection unit 24 and recognizing the output voltage of the storage element via the voltage detection line 22 connected to the external terminal and detecting an abnormality of the storage element; When the control unit 21 detects an abnormality, the connection unit 24 of the power storage element is electrically disconnected.

  With such a control system, normality / abnormality of each power storage element can be confirmed via the control unit 21, and control for obtaining a stable battery capacity can be performed by disconnecting the power storage element confirmed to be abnormal. Therefore, it is possible to obtain a secondary battery control system that can efficiently use a plurality of power storage elements.

  Next, the lease system for the secondary battery according to this embodiment will be described with reference to FIG. As shown in FIG. 13, a communication unit 27 is connected to the control unit 21. Since the communication unit 27 is a communication unit capable of communicating with the Internet network 28, the detection information of the control unit 21 can be notified to a predetermined communication destination (user 29 and management company 30) via the Internet network 28.

  The user 29 has a secondary battery lease contract with the secondary battery management company 30. As secondary battery management information, in addition to basic information such as model number, lease cost, and lease expiration date for each article, the user 29 Discharge history information is accumulated. Therefore, when the control unit 21 detects a storage element that has become below a specified capacity, it can immediately notify the user 29 and the management company 30 of that fact (secondary battery abnormality information). In addition, the secondary battery management company 30 receives secondary battery management information from the control unit 21 in addition to the abnormality information, and the usable battery capacity and the number of charge / discharge cycles before the secondary battery being leased is replaced ( Secondary battery usage days) can be explained to the user and arrangements such as replacement of the article can be made.

  As described above, the connection part that electrically connects the external terminal and the external device provided in each of the plurality of power storage elements included in the secondary battery, the switching control of the connection part, and the voltage detection line that is connected to the external terminal. A control unit 21 having a function of recognizing the output voltage of the power storage element via the connection and detecting an abnormality of the power storage element, and a communication unit 27 connected to the control unit 21 and capable of communicating with the Internet network 28, When the control unit 21 detects an abnormality, the abnormality information is notified to the user 29 of the secondary battery via the communication unit 27, and at the same time, the management company 30 of the secondary battery via the Internet network 28. If the leasing system notifies the abnormal information and management information to the secondary battery management company at the same time that the secondary battery has failed and the information below the specified capacity is reported to the user (user) It is to tell can manage it becomes easy to construct a leasing system usability often highly convenient rechargeable battery.

  As described above, according to the secondary battery of the present invention, on the same plane of the outer case, a plurality of power storage elements are arranged in parallel in an insulated state with a predetermined interval therebetween, and positive and negative corresponding to each power storage element Since each of the external terminals is provided, even in the case of a secondary battery having a plurality of power storage elements, the manufacturing cost is reduced and the electrolyte quickly penetrates into the electrode group of each power storage element. Therefore, it is possible to obtain a convenient and convenient secondary battery.

  In addition, since a plurality of power storage elements are accommodated in the same battery can, the manufacturing cost of the battery can can be reduced, the handling performance of the power storage elements divided into relatively small sizes is improved, and there is no adverse effect such as a short circuit. The manufacturing cost can be reduced together with the fact that the yield does not deteriorate.

  Further, according to the control system for a secondary battery according to the present invention, a plurality of power storage elements are detected by detecting an abnormality of each power storage element via a voltage detection line connected to an external terminal and electrically disconnecting the plurality of storage elements. It is possible to obtain a control system for a secondary battery that can efficiently use the power storage element.

  In addition, according to the secondary battery leasing system of the present invention, by connecting the control unit to a communication unit capable of communicating with the Internet network, the secondary battery malfunctions and becomes less than the specified capacity. By transmitting the secondary battery management information to the secondary battery management company, it becomes easy to manage, and it is possible to construct a secondary battery leasing system that is convenient and convenient.

  Therefore, the secondary battery, its control system, and its leasing system according to the present invention can be suitably used for a large-capacity storage battery, its control system, and its leasing system that are required to be large and stable in performance.

1 (1A, 1B) Electrode group (electric storage element)
2 Positive electrode plate 3 Negative electrode plate 4 Separator 5 Current collecting lead 6Aa-6Bb External terminal 7A, 7B Spacer 8A, 8B Spacer 10 Battery can 11 Exterior case 12 Lid member 21 Control unit 22 (22A, 22B) Voltage detection line 24 Connection unit 27 Communication unit 28 Internet network 29 Secondary battery user (user)
30 Secondary battery management company L1 Separation distance (predetermined interval)
RB, RB1-RB6 secondary battery

Claims (10)

In a battery can, a secondary battery in which a plurality of power storage elements including an electrode group in which a plurality of positive electrode plates and negative electrode plates are laminated via a separator is contained and filled with an electrolyte solution,
A plurality of power storage elements are arranged side by side at a predetermined interval on the same plane of an outer case constituting the battery can, and positive and negative external terminals corresponding to the power storage elements are provided, respectively. Secondary battery. The secondary battery according to claim 1, wherein the predetermined interval has a width that does not hinder the fluidity of the electrolytic solution. The secondary battery according to claim 1, wherein the storage elements arranged in parallel are electrically insulated from each other. The secondary battery according to any one of claims 1 to 3, wherein a spacer made of an insulating member having a predetermined width is disposed between the storage elements arranged in parallel. The spacer which consists of an insulation member of predetermined thickness was arrange | positioned between the said electrical storage elements arranged in parallel and between each electrical storage element and the inner wall of the said battery can. A secondary battery according to any one of the above. The secondary battery according to claim 5, wherein the spacer is interposed between an upper surface side and a lower surface side of the power storage element, and the power storage element is sandwiched between the upper and lower spacers. The power storage element includes a rectangular active material region having a long side portion and a short side portion, and the active material region has a distance from an end portion of the long side portion to a bisector of the short side of 100 mm or less. The secondary battery according to claim 1, wherein the secondary battery is formed as described above. The secondary battery according to claim 1, wherein a voltage detection line is connected to the external terminal so that the battery capacity of each of the storage elements can be confirmed. The secondary battery control system according to any one of claims 1 to 8, wherein an external terminal provided in each of a plurality of power storage elements included in the secondary battery is electrically connected to an external device; A control unit having a function of controlling the switching of the connecting unit and detecting an abnormality of the power storage element by recognizing an output voltage of the power storage element via a voltage detection line connected to the external terminal; A control system for a secondary battery, wherein when the control unit detects an abnormality, the connection portion of the power storage element is electrically disconnected. The lease system for a secondary battery according to any one of claims 1 to 8, wherein an external terminal provided in each of a plurality of power storage elements included in the secondary battery is electrically connected to an external device; A control unit having a function of detecting switching of the connection unit, and detecting an output voltage of the power storage element through a voltage detection line connected to the external terminal to detect abnormality of the power storage element, and the connection unit And a communication unit that is communicable with the Internet network, and when the control unit detects an abnormality, simultaneously notifies the user of the secondary battery of the abnormality information via the communication unit. A secondary battery leasing system that notifies the secondary battery management company of the abnormality information and management information via the Internet network.

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