JP2006127857A - Bipolar battery, battery pack and vehicle equipped with their batteries - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bipolar battery with good insulation, a battery pack and vehicles equipped with their batteries. <P>SOLUTION: The bipolar battery 100 is composed of alternately layered bipolar electrodes 101; each of which consists of a collector 102 one of whose face has a positive electrode layer 103, and the other face has a negative electrode layer 104; and nonwoven clothes 105, which exchange ions between the bipolar electrodes. Ends of a number of layered bipoler electrodes have connectors 106 respectively led from different positions, and they are layered through insulation layers 107 and 108 which have conductive pass 108a to 108m for electric connection in the stacking direction of the connectors. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bipolar battery, an assembled battery, and a vehicle equipped with these batteries having good insulation.

  As described in Patent Document 1 below, the bipolar battery is a battery constructed by laminating a plurality of bipolar electrodes, and has various excellent characteristics such as thinness, light weight and good heat dissipation. ing.

When a bipolar battery is used as a power source for a vehicle, reliability and stability are required. Therefore, a plurality of single batteries constituting a bipolar battery (one single battery is formed between bipolar electrodes), respectively. It is necessary to constantly monitor whether it is functioning normally. For this reason, the voltage of all the single cells is constantly monitored by the voltage detection line so that the deteriorated single cells can be detected.
JP 2000-195495 A

  However, since the voltage detection line for detecting the voltage of each cell is drawn from the insulating layer provided between the bipolar electrodes, the insulation of the voltage detection line until it is connected to an external voltage monitoring device. This had to make the manufacturing process complicated.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a bipolar battery, an assembled battery, and a vehicle equipped with these batteries with good insulation. .

  In order to achieve the above object, a bipolar battery according to the present invention includes a bipolar electrode in which a positive electrode layer is formed on one surface of a current collector and a negative electrode layer is formed on the other surface, and the bipolar electrode between In the bipolar battery formed by alternately laminating a plurality of electrolyte layers that perform ion exchange at the ends, the end portions of the laminated bipolar electrodes have connection terminals drawn from different positions between the laminated bipolar electrodes. The end portions of the bipolar electrodes are stacked via an insulating layer, and the insulating layer includes an energization path that forms an electrical connection in the stacking direction of the connection terminals.

  In the bipolar battery according to the present invention, connection terminals are drawn from different positions for each bipolar electrode, and these connection terminals form an electrical connection in the stacking direction through an energization path provided in the insulating layer. For this reason, the insulation of the voltage detection line (configured by the connection terminal and the energization path) is maintained by the insulating layer, and it is easy to ensure the insulation.

  According to the bipolar battery of the present invention configured as described above, the ends of the plurality of stacked bipolar electrodes have connection terminals drawn from different positions between the stacked bipolar electrodes, and the bipolar The ends of the electrodes are stacked via an insulating layer, and the insulating layer includes an energization path that forms an electrical connection in the stacking direction of the connection terminals. The insulation of the detection line can be easily ensured, and the manufacturing process can be simplified.

Embodiments of a bipolar battery, an assembled battery, and a vehicle equipped with these batteries according to the present invention will be described below in detail with reference to the drawings, divided into [Embodiment 1] and [Embodiment 2]. In the drawings cited in the following embodiments, the thickness and shape of each layer constituting the bipolar battery are exaggerated, but this is done to facilitate understanding of the contents of the invention. Yes, it is not consistent with the thickness and shape of each layer of an actual bipolar battery.
[Embodiment 1]
FIG. 1 is an external view of a bipolar battery according to the present embodiment. The bipolar battery 100 has a rectangular flat shape as shown in the figure, and a positive electrode tab 120 </ b> A and a negative electrode tab 120 </ b> B for extracting electric power are drawn out from both sides thereof. Further, from one side of the bipolar battery 100, a voltage detection line 140 of each cell forming the power generation element 160 of the bipolar battery 100 is drawn out. The power generation element 160 is wrapped with an outer packaging material (for example, a laminate film) 180 of the bipolar battery 100, and the periphery thereof is heat-sealed. It is sealed with.

  2 to 5 are schematic configuration diagrams of the inside of the bipolar battery 100, FIG. 6 is a cross-sectional view taken along the line AA of the bipolar battery 100 shown in FIG. 1, and FIGS. is there.

  2 and 3 are exploded perspective views for explaining the internal structure of the bipolar battery 100. FIG. In these drawings, only a part of the structure necessary for explanation of the internal structure is extracted and shown. The bipolar electrode 101 has a positive electrode layer 103 formed on one surface of a current collector 102 and a negative electrode layer 104 formed on the other surface. As shown in the figure, the positive electrode layer 103 is formed on the outer periphery of the current collector 102 with a certain remaining width, and the negative electrode layer 104 is formed on the entire surface of the current collector 102. As shown in the figure, the bipolar electrode 101 is laminated with the side on which the negative electrode layer 104 is formed and the side on which the positive electrode layer 103 is formed facing each other. When the bipolar electrodes 101 are stacked, a non-woven fabric 105 (electrolyte layer) containing a gel electrolyte that enables ion exchange between the bipolar electrodes is stacked between the bipolar electrodes 101. In the present embodiment, the nonwoven fabric 105 containing a gel electrolyte is used as the electrolyte layer, but an inorganic or organic solid electrolyte may be used.

  A flat connection terminal 106 for detecting the voltage of the unit cell formed by the two bipolar electrodes 101 is provided at the end (remaining portion) of the current collector 102 on the side where the positive electrode layer 103 is formed. Are connected, and the connection terminal 106 is pulled out so as to protrude from its end. The planar shape of the connection terminal 106 is a vertically long rectangle as shown in FIG. 8A, and its cross section is a horizontally long rectangle as shown in FIG. The connection terminal 106 is actually a very thin film-like copper foil of a micron unit. The connection terminals 106 are connected and pulled out at slightly different positions between the stacked bipolar electrodes 101 so as not to overlap with other connection terminals 106 in the stacking direction. Therefore, as shown in FIG. 2, the lead-out position of the connection terminal 106 connected to the uppermost bipolar electrode 101 and the lead-out position of the connection terminal 106 connected to the bipolar electrode 101 that will be positioned below it in the stacking direction. Are positions that do not overlap each other.

  Although not clearly shown in the figure, in this embodiment, a total of 13 bipolar electrodes 101 and 12 non-woven fabrics 105 are used, and the bipolar electrodes 101 and non-woven fabrics 105 are alternately stacked to generate power from the bipolar battery 100. Element 160 is formed. For this reason, a total of 13 connection terminals 106 are drawn out from the left end of the power generation element 160 toward the right end in the figure at equal intervals to avoid overlap.

  On the side of the positive electrode layer 103 of the bipolar electrode 101, an insulating sheet 107 having an opening for exposing the positive electrode layer 103 at the center is laminated. When the insulating sheet 107 is laminated, the end of the current collector 102 of the bipolar electrode 101 is covered all around, and at the same time, the connection terminal 106 is also covered except for the tip. The insulating sheet 107 functions as an insulating layer at the end of the bipolar electrode 101.

  On the front side of the insulating sheet 107 in the figure, the energization path forming film 108 is laminated so that the connection terminal 106 is sandwiched between the insulating sheet 107. The energization path forming film 108 has 13 connection terminal contact portions 108a to 108m provided at equal intervals in the width direction corresponding to the drawing positions of the connection terminals 106 drawn from 13 places as shown in FIG. 7A. is doing. These connection terminal contact portions 108 a to 108 m are formed so that the conduction portion penetrates to the back side in the thickness direction of the energization path forming film 108 as shown in FIG. In the present embodiment, the conductive portions of the connection terminal contact portions 108a to 108m are formed by the thickness so as to penetrate from the front side to the back side of the energization path forming film 108. A conductive film may be formed so as to be conductive between the front side and the back side, and the conductive portions of the connection terminal contact portions 108a to 108m may be used.

  The energization path forming film 108 is laminated between the bipolar electrodes 101. However, when the energization path forming film 108 is laminated between all the bipolar electrodes 101 constituting the power generation element 160, as shown in FIG. The conductive portions of the connection terminal contact portions 108a to 108m are individually electrically connected in the stacking direction across all the layers to form an energization path in the stacking direction. That is, the connection terminal 106 connected to the uppermost bipolar electrode 101 forms a conduction path in the stacking direction at the conductive portion of the connection terminal contact portion 108a connected in the stacking direction, and is connected to the lower layer bipolar electrode 101. The connected terminal 106 is connected to the connecting terminal contact portion 108b connected in the stacking direction to form a conduction path in the stacking direction, and the connection terminal 106 connected to the lowermost bipolar electrode 101 is connected in the stacking direction. An energization path in the stacking direction is formed at the conductive portion of the connection terminal contact portion 108m.

  A non-woven fabric 105 is laminated on the negative electrode side of each bipolar electrode 101, a connection terminal 106 is connected to a predetermined position of an end of each bipolar electrode 101, and the end of each bipolar electrode 101 and the connection terminal 106 are covered. The insulating sheet 107 is laminated, the connection terminals 106 and the connection terminal contact portions 108 a to 108 m of the energization path forming film 108 are individually contacted, and the energization path forming film 108 is laminated under the respective insulation sheets 107. In such a state of lamination, all the bipolar electrodes 101 are laminated over 13 layers. And the peripheral part of the insulating sheet 107 which protruded from the outer peripheral part of the bipolar electrode 101 is heat-sealed over the perimeter.

  FIG. 6 shows a cross-sectional view of the bipolar battery 100 shown in FIG. 1 taken along the line AA. The cross-section after the above-described lamination is in a state as shown in this figure. That is, the negative electrode layer 104 of the bipolar electrode 101 and the positive electrode layer 103 of the bipolar electrode 101 located therebelow are laminated via the nonwoven fabric 105, and these bipolar electrodes 101 form one unit cell. Since the insulating sheet 107 laminated on each bipolar battery 101 is heat-sealed over the entire circumference (in the portions marked with X in FIGS. 5 and 6), the insulating sheet 107 is a non-woven fabric between the bipolar electrodes 101. 105 is completely sealed, and it is possible to avoid a situation in which the electrolyte soaked into the nonwoven fabric 105 leaks outside and the cells are short-circuited. As described above, the insulating sheet 107 has a function of performing interlayer insulation of the connection terminals 106 and a function of sealing the nonwoven fabric 105 between the bipolar electrodes 101, thereby contributing to simplification of the manufacturing process.

  FIG. 5 is a view of the above laminated state as viewed from above. An insulating sheet 107 is laminated so as to cover the entire periphery of the end portion of the current collector 102 of the bipolar electrode 101. Since the insulating sheet 107 is formed to be one size larger than the current collector 102, the thermal fusion of the insulating sheet 107 is performed at a portion protruding from the outer periphery of the current collector 102 (heat fusion portion) as shown in the figure. Do. When the insulating sheet 107 is heat-sealed, the connecting terminal 106 is fixed in a state of being sandwiched between the current collector 102 and the insulating sheet 107, and the insulating sheet 107 in which the energization path forming film 108 is laminated vertically. Temporarily fixed between the two. Further, in this state, the connection terminals 106 of the respective layers are brought into electrical contact with the connection terminal contact portions 108 a to 108 m of the energization path forming film 108. In addition, the connection terminal 106 drawn out from each bipolar electrode will be in an electrical contact state in the state pinched | interposed into the connection terminal contact part 108a-108m of the electricity supply path | pass formation film 108 located up and down. In the present invention, an insulating layer is formed in portions other than the connection terminal contact portions 108a to 108m of the insulating sheet 107 and the energizing path forming film 108. Since the energization paths are formed as described above, the insulation between the energization paths can be ensured without special insulation treatment, and the reliability of insulation can be maintained while reducing the number of parts. Even when used for a long time, there is no risk of a short circuit inside the battery.

  As shown in FIG. 3, the energization path forming film 108 to be positioned at the lowermost layer has a voltage detection line that is electrically connected to the energization paths formed in the stacking direction and derives the voltage of each energization path. A voltage deriving substrate 110 having the structure is stacked. As shown in FIG. 9, the voltage derivation substrate 110 has conductive lands 110 a to 110 m formed at positions corresponding to the connection terminal contact portions 108 a to 108 m of the energization path forming film 108. The voltage detection lines 140 individually connected from the lands 110a to 110m are formed on the substrate.

  When the voltage deriving substrate 110 is laminated on the lowermost layer of the energization path forming film 108, as shown in FIGS. 4 and 5, all the energized path forming films 108 and the voltage deriving substrate 110 are illustrated. It is heat-sealed at the heat-sealed part. When this heat fusion is completed, as shown in FIGS. 3 to 5, the connection terminals 106 of the respective bipolar electrodes 101 become conductive at the connection terminal contact portions 108 a to 108 m in a state where the connection terminals 106 are sandwiched between the energization path forming films 108. The voltage of the unit cell formed between the bipolar electrodes 101 can be measured from the outside on the voltage detection line 140 of the voltage derivation substrate 110.

  When the above lamination is completed, the positive electrode tab 120A is laminated on the positive electrode layer 103 of the uppermost bipolar electrode 101 shown in FIG. 2, and the negative electrode layer 104 of the lowermost bipolar electrode 101 shown in FIG. The negative electrode tab 120B is laminated below. Then, the power generation element 160 and the voltage derivation substrate 110 made of a laminate of the bipolar electrode 101 and the nonwoven fabric 105 are covered with a laminate film 180 that forms an exterior material, and as shown in FIG. With the 120B and voltage detection line 140 pulled out, the outer peripheral portion of the laminate film 180 is heat-sealed.

  The voltage detection line 140 of the voltage derivation substrate 110 is exposed from the laminate film 180, and the voltage detection line 140 includes a circuit for adjusting the voltage balance for each of the 13 cells constituting the laminate battery 100, the laminate battery 100. A circuit for determining the presence or absence of voltage abnormality and a controller for controlling the use state of the bipolar battery 100 based on the detected voltage values are connected.

  In the above embodiment, the circuit for adjusting the voltage balance of the unit cells is provided outside. However, as shown in FIG. 10, a circuit forming portion 117 is provided on a part of the voltage derivation substrate 115, One or both of a circuit for adjusting the voltage balance of the unit cells and a circuit for determining the presence or absence of voltage abnormality of the laminated battery 100 may be formed on the circuit forming unit 117. In the case where only the circuit for adjusting the voltage balance of the single battery is formed in the circuit forming unit 117, the voltage detection line 140 is bipolar based on the circuit for determining the presence or absence of voltage abnormality of the laminated battery 100 and the detected voltage value. A controller that controls the usage state of the battery 100 is connected.

  FIG. 11 shows an example of a circuit that is connected to the voltage detection line 140 and adjusts the voltage balance of the unit cells, or determines whether or not there is a voltage abnormality in the laminated battery 100. In the figure, LAND1 to LAND13 are connection terminals corresponding to the lands 110a to 110m of the voltage derivation substrate 110, respectively. A circuit composed of three resistors and one shunt regulator surrounded by a dotted line in the figure is a voltage adjustment circuit 200 for adjusting the voltage balance of each unit cell. The voltage adjustment circuit 200 is provided for all the single cells. However, the voltage adjustment circuit 200 is overvoltaged when the shunt regulator is energized, for example, when the voltage of the single cell exceeds a specified voltage (for example, 2.5 V) during charging. The electric power of the unit cell is discharged by a resistor, and the voltage of the unit cell is adjusted to the voltage of other unit cells. In addition, the semiconductor chip 210 that detects voltage abnormality of each unit cell and the abnormality signal output circuit 220 that outputs an abnormality signal based on the detected voltage abnormality constitute a circuit that determines whether or not the voltage abnormality of the laminated battery 100 exists. . The semiconductor chip 210 always monitors whether or not the voltage of each single cell is within the upper and lower limit voltage set in consideration of the battery life (presence of voltage abnormality). The abnormality signal output circuit 220 operates when the semiconductor chip 210 detects the presence or absence of voltage abnormality in any single cell, and outputs the occurrence of voltage abnormality to the outside. A controller is connected to the voltage detection line 140. When the controller receives a voltage abnormality signal, the controller disconnects the bipolar battery 100 in which the voltage abnormality has occurred and prohibits the use of the bipolar battery 100.

  As described above, in this embodiment, an example in which the circuit shown in FIG. 11 is connected to the voltage detection line 140 from the outside is shown. However, when the voltage derivation substrate 115 having the circuit forming unit 117 is used, FIG. Among the circuits shown, at least the voltage adjustment circuit 200 and the semiconductor chip 210 are formed on the circuit formation portion 117. In this way, since the circuit forming portion 117 is positioned in the laminate film 180 as the exterior material, the number of electric wires drawn out from the voltage detection line 140 can be extremely reduced, and the voltage detection line 140 can be reduced accordingly. Since the width can be narrowed, the sealing performance of the heat fusion part is improved.

  The bipolar batteries described above are connected in series or in parallel to form an assembled battery module 250 (see FIG. 12), and a plurality of assembled battery modules 250 are connected in series or in parallel to form an assembled battery. 300 can also be formed. FIG. 12 shows a plan view (FIG. A), a front view (FIG. B), and a side view (FIG. C) of the assembled battery 300, but the assembled battery modules 250 are electrically connected to each other like a bus bar. The assembled battery modules 250 are stacked in a plurality of stages using the connection jig 310. How many bipolar batteries 110 are connected to create the assembled battery module 250 and how many assembled battery modules 250 are stacked to create the assembled battery 300 depend on the vehicle (electric vehicle) to be mounted. It may be determined according to the battery capacity and output. Of course, the assembled battery module 250 and the assembled battery 300 are equipped with the monitoring circuit shown in FIG. 11, and the bipolar battery 100, the assembled battery module 250, and the assembled battery 300 are signals output from the monitoring circuit by the monitoring circuit and the controller. The use state of the battery is controlled based on the above. The use state of the battery referred to here means bypassing the unit cell constituting the bipolar battery 100, restricting use in an assembled battery module unit, or restricting use of the assembled battery.

  Thus, the assembled battery 300 in which a plurality of assembled battery modules 250 are connected in series and parallel can obtain high capacity and high output, and the reliability of each assembled battery module 250 is high. The long-term reliability of 300 can be maintained. Further, even if some of the assembled battery modules 250 fail, repair can be performed by simply replacing the failed part.

  In order to mount the assembled battery 300 on the electric vehicle 400, it is mounted under the seat at the center of the vehicle body of the electric vehicle 400 as shown in FIG. This is because if it is installed under the seat, the interior space and the trunk room can be widened. The place where the assembled battery 300 is mounted is not limited to the position under the seat, but may be a lower part of the rear trunk room or an engine room in front of the vehicle. The electric vehicle 400 using the assembled battery 300 as described above has high durability and can provide sufficient output even when used for a long period of time. Furthermore, it is possible to provide electric vehicles and hybrid vehicles that are excellent in fuel efficiency and running performance.

In the present invention, not only the assembled battery 300 but also only the assembled battery module 250 may be mounted depending on the usage, or the assembled battery 300 and the assembled battery module 250 may be mounted in combination. Also good. Further, as the vehicle on which the assembled battery or the assembled battery module of the present invention can be mounted, the above-described electric vehicle and hybrid car are preferable, but are not limited thereto.
[Embodiment 2]
FIG. 14 is an external view of the bipolar battery according to the present embodiment. The bipolar battery according to the present embodiment is not prepared by laminating elements that constitute each layer as in the first embodiment, and printing an image using an inkjet printer. In this way, the layers are formed in order from the lower layer so as to draw one layer at a time.

  Bipolar battery 500 according to the present embodiment has a rectangular flat shape as shown in the figure, and positive electrode tab 520A and negative electrode tab 520B for taking out electric power are drawn out from both sides thereof. . Further, from one side of the bipolar battery 500, a voltage detection line 540 of each cell forming the power generation element 560 of the bipolar battery 500 is drawn out. The power generation element 560 is wrapped with an exterior material (for example, a laminate film) 580 of the bipolar battery 500, and the periphery thereof is heat-sealed. The power generation element 560 is in a state where the positive electrode tab 520A, the negative electrode tab 520B, and the voltage detection line 540 are drawn out. It is sealed with.

  In this embodiment, the power generation element 560 is formed by repeatedly applying a predetermined adhesion pattern for each layer by an ink jet printer method. That is, in this embodiment, as shown in FIG. 15, the adhesion patterns shown in the first layer to the fifth layer are applied to the base material 600 in order as in the case of forming a color image with an ink jet printer.

  That is, on the base material 600 shown in FIG. 15, the copper layer 610 is printed on the base material 600 and the connection terminals 630a to 630g made of the copper layer are printed on the base material 600, as shown. Yes. Adhesion patterns such as which parts of the substrate 600 are to be printed with a copper layer, an insulating layer, and connection terminals are set in advance for each layer. Material is selectively injected in each region.

  In addition, the copper layer 610 and the connection pattern 630a of the base material 600 are printed so as to be in a conductive state. On the base material 600, the first layer is printed. That is, the negative electrode active material 640 is overprinted on the corresponding position of the copper layer 610, and similarly, the insulating layer 620 and the connection terminals 630a to 630g are printed on the insulation layer 620 and the connection terminals 630a to 630g. Next, the second layer is printed on the first layer. That is, the ion conductive material 650 is overprinted at the corresponding position of the negative electrode active material 640, and the insulating layer 620 and the connection terminals 630a to 630g are printed on the insulating layer 620 and the connection terminals 630a to 630g. Further, the third layer is printed on the second layer. That is, the positive electrode active material 660 is overprinted at a position corresponding to the ion conductive material 650, and the insulating layer 620 and the connection terminals 630a to 630g are printed on the insulating layer 620 and the connection terminals 630a to 630g. Further, a fourth layer is printed on the third layer. That is, the copper layer 610 is overprinted at the corresponding position of the positive electrode active material 660, and the insulating layer 620 and the connection terminals 630a to 630g are printed on the insulation layer 620 and the connection terminals 630a to 630g. The copper layer 610 and the connection pattern 630a are printed so as to be in a conductive state. Further, similarly to the first layer, the negative electrode active material 640 is overprinted at the corresponding position of the copper layer 610, and similarly, the insulating layer 620 and the connection terminals 630b to 630g are formed on the insulation layer 620 and the connection terminals 630b to 630g. Printed. Note that the connection terminal 630a is not printed on the fifth insulating layer 620 only between the copper layer 610 of the base material 600 and the fourth copper layer 610 constituting one unit cell. This is because it is desired to form an electrically conductive state and to form an energization path in the stacking direction for forming the voltage of one single cell.

  In the present embodiment, printing as described above is performed until seven unit cells are formed. As shown in FIG. 16, energization paths formed in the stacking direction are the seven connection terminals 630 a to 630 g formed in the insulating layers of the lowermost unit cell 700, and the unit cell thereon About 710, it is six places of connecting terminals 630b-630g formed in an insulating layer of each layer, and about unit cell 720 on it, it is five places of connecting terminals 630c-630g formed in an insulating layer of each layer. The unit cell 730 thereabove has four connection terminals 630d to 630g formed in the insulating layers of each layer, and the number of energization paths decreases as the unit cell located on the upper side. The energization path between the single cells is in a conductive state in the stacking direction.

  A positive electrode tab 520A and a negative electrode tab 520B are connected to the cells located in the uppermost layer and the lowermost layer, respectively. Further, a voltage derivation substrate 750 as shown in FIG. 17 is laminated on the base material 600 of the unit cell 700 located at the lowermost layer. The voltage deriving substrate 750 includes a voltage detection line 770 that is electrically connected to the energizing path and derives the voltage of each energizing path, and a current collector foil 755 is formed on the surface thereof. As shown in FIG. 17, the voltage derivation board 750 has conductive lands 760a to 760g formed at corresponding positions of the connection terminals 630a to 630g. A voltage detection line 770 connected to is formed on the substrate. Therefore, the voltage of the cells 700, 710, 720, etc. can be known by detecting the voltage between the lands.

  The power generation element 560, which is an assembly of unit cells formed as described above, and the voltage derivation substrate 750 are covered with a laminate film 580 similarly to the first embodiment, and as shown in FIG. With the negative electrode tab 520B and the voltage detection line 540 pulled out, the outer peripheral portion of the laminate film 580 is heat-sealed.

  As a circuit for monitoring the voltage of the unit cell, a circuit similar to the circuit shown in FIG. 11 of Embodiment 1 can be used. As in the first embodiment, this circuit may be connected to the outside of the voltage detection line 770 to monitor the voltage from the outside, or may be formed on the voltage derivation substrate 750 and incorporated in the laminate film 580. You may do it.

  As described above, in the bipolar battery 500 of the present embodiment, as in the bipolar battery 100 of the first embodiment, the energization path in which the voltages of the individual cells constituting the power generation element are formed in the stacking direction (battery thickness direction). It is possible to detect via a voltage detection line located at one end in the stacking direction. For this reason, the sealing property of a laminate film becomes favorable, and it becomes a bipolar battery with high durability and reliability. Further, by forming a circuit for monitoring the voltage in the laminate film, it becomes possible to reduce the size of the bipolar battery, the assembled battery, and the like.

  In this embodiment, the structure of only the bipolar battery has been described. However, as in the first embodiment, an assembled battery unit or an assembled battery is formed from this bipolar battery, and these batteries are mounted on the vehicle. May be.

  According to the present invention, the insulation of the voltage detection line constituted by the connection terminal and the energization path can be easily ensured, and the manufacturing process can be simplified, which is very useful for mass production of bipolar batteries.

1 is an external view of a bipolar battery according to an embodiment. It is a schematic block diagram inside a bipolar battery. It is a schematic block diagram inside a bipolar battery. It is a schematic block diagram inside a bipolar battery. It is a schematic block diagram inside a bipolar battery. It is AA sectional drawing of the bipolar battery shown in FIG. It is a schematic block diagram of the components of a bipolar battery. It is a schematic block diagram of the components of a bipolar battery. It is a schematic block diagram of the components of a bipolar battery. It is a schematic block diagram of the components of a bipolar battery. It is a monitoring circuit diagram incorporated in a bipolar battery or externally connected. It is a schematic block diagram of an assembled battery. It is a figure which shows the state with which the assembled battery was mounted in the vehicle. It is an external view of the bipolar battery which concerns on other embodiment. It is a schematic block diagram inside a bipolar battery. It is a schematic block diagram inside a bipolar battery. It is a schematic block diagram inside a bipolar battery.

Explanation of symbols

100 bipolar battery,
101 bipolar electrode,
102 current collector,
103 positive electrode layer,
104 negative electrode layer,
105 Nonwoven fabric,
106 connection terminal,
107 insulation sheet,
108 energization path forming film,
108a-108m connection terminal contact portion,
110 voltage derivation board,
110a-110m land,
115 voltage deriving board,
115a-115m land,
117 circuit forming section,
120A positive electrode tab,
120B negative electrode tab,
140 voltage detection line,
160 power generation elements,
180, 580 laminate film,
200 voltage adjustment circuit,
210 semiconductor chip,
220 abnormal signal output circuit,
250 battery module,
300 battery packs,
310 connection jig,
400 electric car,
500 bipolar battery,
520A positive electrode tab,
520B negative electrode tab,
540 voltage detection line,
560 power generation elements,
600 substrate,
610 copper layer,
620 insulating layer,
630a-630g connection terminal,
640 negative electrode active material,
650 ion conductive material,
660 positive electrode active material,
700 cells,
710 cell,
720 cell,
730 cells,
750 voltage derivation board,
755 current collector foil,
760a-760g land,
770 Voltage detection line.

Claims (9)

A bipolar electrode in which a positive electrode layer is formed on one surface of the current collector and a negative electrode layer is formed on the other surface, and a plurality of electrolyte layers that perform ion exchange between the bipolar electrodes are alternately stacked. In the bipolar battery
The ends of the plurality of stacked bipolar electrodes have connection terminals drawn from different positions between the stacked bipolar electrodes,
The bipolar battery is characterized in that an end portion of the bipolar electrode is laminated via an insulating layer, and the insulating layer includes an energization path that forms an electrical connection in the lamination direction of the connection terminals.   2. The bipolar battery according to claim 1, wherein the insulating layer is formed on the entire circumference of the end portion of the bipolar electrode, and seals an electrolyte layer between the bipolar electrodes.   The bipolar battery according to claim 1, wherein a substrate including a voltage detection line that is electrically connected to the energizing path and derives a voltage of the energizing path is stacked on the insulating layer.   The bipolar battery according to claim 3, wherein a part of the substrate is exposed from an exterior material that seals the laminate of the bipolar electrode and the electrolyte layer.   The substrate located inside the exterior material is provided with either or both of a circuit for adjusting a voltage balance between the bipolar electrodes based on a voltage between the voltage detection lines and a circuit for determining the presence or absence of voltage abnormality. The bipolar battery according to claim 4, wherein the bipolar battery is provided.   The substrate exposed to the outside of the exterior material is connected to a controller that controls a use state of the bipolar battery based on a determination result from a circuit that determines whether or not the voltage is abnormal. Item 6. The bipolar battery according to Item 5.   On the substrate exposed to the outside of the exterior material, a circuit provided on the outside for adjusting the voltage balance between the bipolar electrodes based on the voltage between the voltage detection lines, or a circuit for determining the presence or absence of voltage abnormality Either or both of these are connected, The bipolar battery of Claim 4 characterized by the above-mentioned.   An assembled battery comprising a plurality of the bipolar batteries according to claim 1 connected to each other.   A vehicle comprising the bipolar battery according to claim 1 or the assembled battery according to claim 8 as a power source.

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