JP2013037969A - Power supply device, vehicle, and manufacturing method of power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a connection path for connecting an assembled battery to another battery.SOLUTION: A power supply device which houses a power generating element inside a battery case having a straight pipe shape and includes an assembled battery formed by arranging a plurality of electric cells in which the battery case and a negative electrode terminal are electrically connected, in a radial direction of the battery case is characterized by including: a conductive plate having a plurality of openings into which electric cells are inserted; a conductive layer intervening between the openings and the battery cases; and a bus bar used for connection of the conductive plate and a positive electrode terminal of another battery adjacent to the assembled battery.

Description

  The present invention relates to a method for connecting single cells in a power supply device.

  A hybrid vehicle, an electric vehicle, and the like using a battery including a plurality of single cells such as a lithium ion battery as a power source are known.

  Patent Document 1 discloses a hexagonal case in plan view provided with battery accommodating parts (insertion parts) arranged concentrically, and a plurality of cylindrical unit batteries each accommodated inside each battery accommodating part. The secondary battery module which has an insulating member interposed between a battery accommodating part and a unit battery is disclosed. When this type of secondary battery module is used as a power source for a vehicle, in order to improve battery output, it may be mounted on the vehicle as an assembled battery assembly in which a plurality of secondary power modules are connected in series.

JP 2006-156404 A

  However, in the configuration of Patent Document 1, an insulating member is interposed between the unit battery and the battery housing portion, and the case is insulated from the unit battery. For this reason, in order to connect adjacent secondary battery modules, the positive terminal of each unit cell is electrically connected via the positive electrode bus bar, and the negative terminal of each unit cell is electrically connected via the negative electrode bus bar. In addition, it was necessary to electrically connect the positive electrode terminal of the adjacent secondary battery module and the negative electrode bus bar. For this reason, the size of the bus bar is required by the length of the unit battery, which increases the cost. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to shorten a connection path for connecting a secondary battery module, that is, an assembled battery to another battery.

  In order to solve the above problems, a power supply device for a vehicle according to the present invention includes (1) a power generation element housed in a straight tube-shaped battery case, and the battery case and the negative electrode terminal are electrically connected. A battery unit in which the unit cells are arranged in a radial direction of the battery case, the conductive plate having a plurality of openings through which the unit cells are inserted, the openings, and the units. A conductive layer interposed between the battery case, the conductive plate, and a first bus bar used for connection to a positive electrode terminal of another battery adjacent to the assembled battery.

  (2) In the configuration of (1), the first bus bar is connected to the conductive plate and extends in a direction orthogonal to the radial direction of the battery case, and an end of the conductive plate connection portion. A positive electrode connection portion that extends from the portion and is connected to the positive electrode terminal of the other battery. According to the configuration of (2), the shape of the bus bar can be simplified as compared with the method of directly connecting the positive electrode terminal and the negative electrode terminal of the unit cell.

  (3) In the configurations of (1) to (2), the other battery houses a power generation element in a straight tube-shaped battery case, and the battery case and the negative electrode terminal are electrically connected. The unit cell may be another assembled battery in which a plurality of unit cells are arranged in the radial direction of the battery case. According to the configuration of (3), the connection path for electrically connecting the assembled batteries to each other can be shortened.

  (4) In the configurations of (1) to (3), the conductive layer includes at least a resin body that expands due to a temperature rise, and a particle group made of a conductive filler mixed in the resin body. When the temperature of the unit cell rises from the operating temperature to the abnormal temperature, the resin body thermally expands in the opening direction of the opening, thereby reducing the contact area between the particles in the particle group. According to the configuration of (4), the temperature variation between the single cells is suppressed, and it is possible to effectively suppress the battery deterioration from being accelerated by increasing the value of the current flowing through the specific single cell having a high temperature. .

  (5) In the configurations of (1) to (4) above, in the direction orthogonal to the radial direction of the battery case, the conductive plate is closer to the positive terminal in the unit cell than the negative terminal in the unit cell. Can be located in the area. According to the structure of (5), the connection path which connects an assembled battery and another battery in series can be shortened more reliably.

  (6) In the configuration of (5) above, a coolant is provided to a part of the battery case located in a region where the negative electrode terminal is located across the conductive plate in a direction orthogonal to the radial direction of the battery case. Can be provided. According to the configuration of (6), the cooling area of the unit cell can be increased while shortening the connection path.

  (7) The power supply devices of (1) to (6) can be mounted on a vehicle. As the vehicle, a hybrid vehicle or an electric vehicle that drives a motor for driving the vehicle using electric power obtained from the power supply device can be considered.

  (8) In order to solve the above-described problem, a method of manufacturing a power supply device according to the present invention includes a first step of forming a plurality of through-shaped openings in a conductive plate, and a straight tube-shaped battery case. A unit cell that houses a power generation element and in which the battery case and a negative electrode terminal are electrically connected, wherein the unit cell has an outer diameter smaller than a diameter of the opening, and the opening and A second step of inserting each of the plurality of openings while maintaining a non-contact state of the battery case; and a third step of filling a conductive paste in a gap formed between the openings and the battery case. And a fourth step of connecting the conductive plate and the positive terminal of another battery.

  ADVANTAGE OF THE INVENTION According to this invention, the connection path | route which connects an assembled battery with another battery can be shortened.

It is a schematic block diagram of a power supply device. It is an external appearance perspective view of an assembled battery. It is sectional drawing which cut | disconnected the cell contained in the assembled battery in the direction orthogonal to a radial direction. It is sectional drawing which cut | disconnected the single cell hold | maintained at the electrically conductive plate to radial direction. It is the schematic diagram which showed typically the behavior according to the temperature of the conductive filler contained in a conductive layer (normal state) It is the schematic diagram which showed typically the behavior according to the temperature of the conductive filler contained in a conductive layer (state at the time of abnormality) It is a circuit diagram for demonstrating the expansion characteristic of the temperature variation in a parallel circuit. It is a flowchart for demonstrating the manufacturing method of a power supply device.

  A power supply device for a vehicle according to the present embodiment will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of the power supply device 1. FIG. 2 is an external perspective view of the first assembled battery 2A. FIG. 3 is a cross-sectional view of the unit cell 4 included in the first assembled battery 2A cut in a direction orthogonal to the radial direction. FIG. 4 is a cross-sectional view of the unit cell 4 held on the conductive plate 6 cut in the radial direction. In these drawings, the X axis, the Y axis, and the Z axis are three mutually orthogonal orthogonal axes. The definitions of the X axis, the Y axis, and the Z axis are the same in the other drawings.

  Referring to FIG. 1, power supply device 1 includes a first assembled battery 2A, a second assembled battery 2B, a third assembled battery 2C, and a fourth assembled battery 2D. The power supply device 1 supplies electric power to a motor (not shown) used for traveling the vehicle. The vehicle may be an electric vehicle that travels using only the electric power of power supply device 1 or a hybrid vehicle that uses both the electric power of power supply device 1 and the power obtained by the internal combustion engine as a power source. First assembled battery 2 </ b> A includes a plurality of unit cells 4 and conductive plate 6. Referring to FIG. 3, the cell 4 includes a positive electrode terminal 41, a battery case 42, a power generation element 43, a gasket 44, a positive electrode lead wire 45, a negative electrode lead wire 46, and a negative electrode terminal 47. Including.

  The positive electrode terminal 41 is connected to the positive electrode body of the power generation element 43 through a positive electrode lead wire 45. The positive electrode terminal 41 includes a gas passage 41a and a valve plate 41b. When a battery abnormality occurs such as overcharge or overdischarge, gas is generated from the power generation element 43, and when the internal pressure of the battery case 42 reaches the operating pressure of the valve plate 41b, the valve plate 41b breaks and the generated gas flows into the gas passage 41a. It passes through the cell 4 and passes through. Instead of the valve plate 41b, a valve that opens and closes when a predetermined pressure is reached by a spring may be used.

  The battery case 42 is formed in a straight pipe shape having a circular cross section in the radial direction (see FIG. 4). For the battery case 42, a conductive metal material can be used. The battery case 42 and the negative electrode terminal 47 are electrically connected, and the battery case 42 is charged to the negative electrode. The battery case 42 and the negative electrode terminal 47 may be integrally formed by drawing a metal plate, or may be formed by connecting them after forming them separately. The negative electrode terminal 47 is connected to the negative electrode body of the power generation element 43 through the negative electrode lead wire 46.

  The power generating element 43 is formed by laminating a positive electrode body, a negative electrode body, and a separator disposed between the positive electrode body and the negative electrode body. The separator holds the electrolyte. A positive electrode active material is applied to the surface of the positive electrode body, and a negative electrode active material is applied to the surface of the negative electrode body. However, an uncoated portion of the positive electrode active material and the negative electrode active material is formed on a part of the surface of the positive electrode body and a part of the surface of the negative electrode body, respectively. A positive lead wire 45 is connected to an uncoated portion of the positive electrode active material of the positive electrode body. A negative electrode lead wire 46 is connected to the uncoated portion of the negative electrode active material of the negative electrode body. Thereby, the positive electrode body of the power generation element 43 and the positive electrode terminal 41 are electrically and mechanically connected, and the negative electrode body and the negative electrode terminal 47 are electrically and mechanically connected.

The single battery 4 may be a secondary battery such as a nickel metal hydride battery or a lithium ion battery. When the unit cells 4 is a nickel hydride battery, as the active material of positive electrode, using a nickel oxide as the active material of the negative electrode _{body, MmNi (5-x-y} -z) Al x Mn y Co z ( A hydrogen storage alloy such as (Mm: Misch metal) can be used. When the unit cell 4 is a lithium ion battery, a lithium-transition metal composite oxide can be used as the positive electrode active material, and carbon can be used as the negative electrode active material. As the conductive agent, acetylene black, carbon black, graphite, carbon fiber, or carbon nanotube can be used.

  A protruding portion 42 a is formed on the outer surface of the battery case 42 so as to protrude radially inward. The positive terminal 41 is supported by the protrusion 42 a in the inner diameter region of the battery case 42. In FIGS. 1 and 2, the protruding portion 42a is omitted for the sake of simplicity. The gasket 44 is made of an insulating material, and is interposed between the positive terminal 41 and the inner surface of the battery case 42. Thereby, the positive electrode terminal 41 and the battery case 42 having the same potential as the negative electrode terminal 47 are electrically insulated.

  With reference to FIGS. 1, 2, and 4, the plurality of unit cells 4 are arranged in the radial direction of the battery case 42. The conductive plate 6 includes a plurality of openings 61 through which the plurality of single cells 4 are respectively inserted. The opening diameter of each opening 61 is set larger than the outer diameter of each unit cell 4. Therefore, a gap is formed between each opening 61 of the conductive plate 6 and the battery case 42 of each unit cell 4, and the conductive layer 10 is filled in this gap. Therefore, the conductive plate 6 is electrically connected to the negative electrode terminal 47 through the conductive layer 10 and the battery case 42 and is equipotential with each other. Each unit cell 4 is supported by the conductive plate 6 by being inserted into each opening 61 of the conductive plate 6. Thereby, the role which supports each cell 4 and the role which connects each negative electrode terminal 47 with respect to the electrically conductive plate 6 can be combined.

  Here, the heat of each unit cell 4 generated during charging / discharging is transferred to the conductive plate 6 through the conductive layer 10 and is dissipated through the conductive plate 6. Therefore, temperature variation among the plurality of single cells 4 is suppressed, and a decrease in battery life can be suppressed. Thereby, with the role mentioned above with respect to the electrically conductive plate 6, the role of the heat dissipation plate which suppresses temperature variation can be combined.

  The conductive plate 6 can be made of aluminum, copper, iron, or the like excellent in thermal conductivity and conductivity. The conductive layer 10 includes a resin and a conductive filler mixed in the resin. As the conductive filler, carbon-based materials such as carbon black, carbon fiber and graphite, metal fine powders, metal oxides, metal fibers, metal materials such as whiskers, glass beads, synthetic fibers, and the like can be used. A filler may be included in the conductive layer 10. The other second to fourth assembled batteries 2B to 2D have the same configuration as that of the first assembled battery 2A, and thus description thereof will not be repeated.

  Here, by interposing the conductive layer 10 between the opening 61 formed in the conductive plate 6 and the battery case 42, the region in the longitudinal direction of the unit cell 4 is divided into two regions with the conductive plate 6 interposed therebetween. Can be divided. Of these regions, the region on the side where the positive electrode terminal 41 is located can be used as a smoke exhaust path for escaping the gas generated from the power generation element 43, and the region on the side where the negative electrode terminal 47 is located is on each cell 4. It can be used as a cooling path for cooling by blowing the refrigerant in the radial direction.

  The bus bar 8B electrically and mechanically connects the first assembled battery 2A and the second assembled battery 2B arranged adjacent to each other. The bus bar 8B includes a positive terminal connecting portion 81 and a conductive plate connecting portion 82. The positive electrode terminal connection portion 81 extends in the radial direction (X-axis direction) of the unit cells 4 and is electrically and mechanically connected to the positive electrode terminal 41 of each unit cell 4. As a connection method, welding can be used. The conductive plate connection portion 82 is formed at the end portion of the positive electrode terminal connection portion 81 in the X-axis direction, and extends in the Z-axis direction (longitudinal direction of the unit cell 4). The leading end of the conductive plate connecting portion 82 is electrically and mechanically connected to the conductive plate 6 provided in the first assembled battery 2A. As a connection method, welding can be used. Thereby, the 1st assembled battery 8A and the 2nd assembled battery 8B can be electrically connected in series. The bus bar 8A electrically and mechanically connects the first assembled battery 2A and the third assembled battery 2C arranged adjacent to each other, and the bus bar 8D includes the second assembled battery 2B and the second assembled battery 2B arranged adjacent to each other. Four assembled batteries 2D are electrically and mechanically connected to each other. Since bus bars 8A and 8D have the same configuration as bus bar 8B, description thereof will not be repeated.

  The bus bar 8C is electrically and mechanically connected to the positive terminal 41 of the third assembled battery 2C. As a connection method, welding can be used. The bus bar 8C is used as a total positive terminal of the power supply device 1. The bus bar 8E is electrically and mechanically connected to the conductive plate 6 of the fourth assembled battery 2D. As a connection method, welding can be used. The bus bar 8E is used as a total minus terminal of the power supply device 1.

  Since the first to fourth assembled batteries 2 </ b> A to 2 </ b> D each have a plurality of single cells 4 electrically connected in parallel, the battery capacity of the power supply device 1 can be improved. Since the first to fourth assembled batteries 2A to 2D are electrically connected to each other in series, a high battery voltage corresponding to the vehicle system voltage can be obtained.

  Here, in the method of connecting the positive electrode terminal 41 of the first assembled battery 2A and the negative electrode terminal 47 of the second assembled battery 2B (hereinafter referred to as the method of the comparative example), one end in the longitudinal direction of the unit cell 4 Since the bus bar needs to be routed from one end to the other end, the wiring path becomes long. On the other hand, in this embodiment, since the positive electrode terminal 41 and the conductive plate 6 located in a region closer to the positive electrode terminal 41 than the negative electrode terminal 47 are connected, the wiring path of the bus bar can be shortened. it can.

  Furthermore, in the method of the comparative example, the conductive plate connecting portion 82 must be connected to the negative electrode terminal 47 located at the bottom of the unit cell 4 by extending in the Z-axis direction and further extending in the X-axis direction. This complicates the shape of the bus bar. On the other hand, since the bus bar 8B of the present embodiment is formed in an L shape, the shape of the bus bar can be simplified.

  That is, in this embodiment, the role of holding the unit cell 4 with respect to the conductive plate 6, the role of dissipating the heat generated in the unit cell 4, the role of connecting the negative terminal 47 to each other, and the wiring path of the bus bar are shortened. These four different functions are integrated, and the cost can be reduced and the manufacturing process can be simplified by reducing the number of parts.

  The conductive plate 6 is preferably positioned in a region closer to the positive electrode terminal 41 than the negative electrode terminal 47 in a direction (Z-axis direction) orthogonal to the radial direction of the battery case 42. Thereby, the wiring path | route of bus-bar 8A-8D can further be shortened, and also the cooling area of the cell 4 can be enlarged more. In other words, in the direction orthogonal to the radial direction of the battery case 42, the region on the side where the negative electrode terminal 47 is located across the conductive plate 6 can be used as a cooling path. Thus, the cooling area can be further increased. Thereby, the temperature variation between the single cells 4 can be suppressed more effectively.

  Next, the effect obtained by interposing the conductive layer 10 in the gap formed between the opening 61 of the conductive plate 6 and the battery case 42 of the unit cell 4 will be described in detail. 5 and 6 show the behavior according to the temperature of the conductive filler contained in the conductive layer 10, FIG. 5 corresponds to the normal state, and FIG. 6 corresponds to the non-normal state. doing. Here, the normal state means a state in which the battery temperature is controlled to an operating temperature set by an upper limit temperature that does not promote battery deterioration and a lower limit temperature that is necessary for securing necessary battery output. To do. The operating temperature is appropriately changed according to the type of battery. The non-normal state means a state where the battery temperature is higher than the use temperature and reaches an abnormal temperature that promotes battery deterioration.

  The parallel connection has a characteristic that the temperature difference between the single cells 4 is more likely to expand than in the case of the series connection. This point will be described in detail with reference to FIG. FIG. 7 is a circuit diagram of a parallel circuit in which a first unit cell 4A having an internal resistance R1 and a second unit cell 4B having an internal resistance R2 are connected in parallel. The current value of the first unit cell 4A is I1, and the current value of the second unit cell 4B is I2. The internal resistance of the battery decreases as the battery temperature increases. Therefore, for example, when the temperature of the first unit cell 4A is higher than the temperature of the second unit cell 4A, the internal resistance R1 of the first unit cell 4A is higher than the internal resistance R2 of the second unit cell 4B. Conversely, the current value I1 of the first unit cell 4A becomes higher than the current value I2 of the second unit cell 4B. Here, the calorific value is calculated by multiplying the square of the current value by the internal resistance. Therefore, the first unit cell 4A has a larger calorific value than the second unit cell 4B, and the first unit cell The temperature difference between the battery 4A and the second unit cell 4B further expands. Therefore, in the parallel circuit, it is necessary to sufficiently suppress the temperature variation between the single cells 4 so that the current does not concentrate on the specific single cells.

  In order to solve the above problems, the conductive layer 10 has the following effects. The resin contained in the conductive layer 10 is contained in the opening 61 formed in the conductive plate 6 in the normal state illustrated in FIG. When the battery temperature rises and the abnormal state shown in FIG. 6 is reached, the resin contained in the conductive layer 10 expands in the opening direction of the opening 61, and a part of the resin extends to the outside of the opening 61. Therefore, the contact area between the conductive fillers 10a included in the conductive layer 10 is reduced, and the current flowing through the unit cell 4 can be reduced. That is, since the conductive filler 10a moves in a direction away from each other when the resin is thermally expanded, the contact area is reduced, so that the current hardly flows. By utilizing the temperature characteristics of the conductive filler 10a, it is possible to suppress the current from being concentrated on the specific unit cell 4. The unit cell 4 in which the current is suppressed gradually decreases in temperature, and the normal state, that is, conductivity is restored by the contraction of the resin.

  The conductive layer 10 having the above characteristics can be obtained by appropriately selecting the type of conductive filler, resin and filler. For example, a material that expands near an abnormal temperature set according to the type of the unit cell 4 can be used as the resin.

  Here, the structure which provides the assembled battery 2A-2D with the fuse which fuses a current circuit at the time of battery abnormality is also considered. However, in this configuration, since a high current continues to flow until the fuse is blown, the control becomes complicated, and the battery cannot be reused once blown. On the other hand, according to the configuration of the present embodiment, it is possible to limit the current of the unit cell 4 that has reached the battery abnormality earlier. Further, since the temperature of the unit cell 4 is limited and the temperature is lowered, and the conductive layer 10 returns from the abnormal state illustrated in FIG. 6 to the normal state illustrated in FIG. 5, it can be reused. However, the structure which incorporates both the conductive layer 10 and a fusing fuse may be sufficient.

  According to the above embodiment, when the current flows through the unit cell 4 and the temperature rises, it becomes difficult for the current to flow, and the temperature naturally decreases. Therefore, the temperature of the specific unit cell 4 is prevented from increasing. Is done. Thereby, the temperature variation between the single cells 4 included in the assembled battery 2 can be effectively suppressed. In particular, it can be suitably used in a battery pack of a parallel circuit in which temperature variations are likely to increase.

  Next, a method for manufacturing the assembled battery 2A will be described with reference to FIG. In step S <b> 101, openings 61 corresponding to the number of unit cells 4 are formed in the flat conductive plate 6. The opening 61 may be formed by lowering a punch (not shown) with respect to the conductive plate 6 placed on a die (not shown). In step S <b> 102, each unit cell 4 is inserted into each opening 61 formed in the conductive plate 6. At this time, the insulating film attached to the battery case 42 of the unit cell 4 is removed in advance, and the unit cell 4 is inserted in a state of being positioned so as to pass through the opening center of the opening 61. That is, the unit cell 4 is inserted into the opening 61 with the battery case 42 and the opening 61 in a non-contact state.

  In step S103, the gap formed between the opening 61 and the battery case 42 of the unit cell 4 is filled with the conductive paste, and is left until the resin contained in the conductive paste is cured. As a result, the conductive plate 6 is negatively charged. In step S104, the conductive plate 6 of the first assembled battery 2A and the positive terminal of the second assembled battery 2B are connected by the bus bar 8B. Here, since the wiring path of the bus bar is shortened as compared with the conventional method in which the negative electrode terminal 47 of the first assembled battery 2A and the positive electrode terminal 41 of the second assembled battery 2B are directly connected, the wiring work is made more efficient. Can do. Moreover, since the connection surface of the conductive plate 6 to which the conductive plate connection portion 82 of the bus bar 8B is connected is formed flat, the connection work can be easily performed.

  According to the above-described method, when the conductive paste is filled, the work of charging the conductive plate 6 negatively and the work of fixing the unit cell 4 can be performed simultaneously. Thereby, the manufacturing process is simplified and the cost can be reduced.

(Modification 1)
In the above-described embodiment, the method of connecting the bus bar to the adjacent assembled battery has been described, but the present invention is not limited to this. In other words, the battery to be connected may be another unit cell having a cylindrical shape with a larger capacity and higher output than the unit cell 4. In this case, the conductive plate 6 of the assembled battery 2A and the positive terminal of the other unit cell are connected via the bus bar. Thereby, the wiring circuit of a bus bar can be shortened.

DESCRIPTION OF SYMBOLS 1 Power supply device 2A-2D 1st-4th assembled battery 4 Single battery 6 Conductive plate
8 Bus bar 10 Conductive layer 10a Conductive fine particles 41 Positive electrode terminal
42 Battery case 43 Power generation element 44 Gasket 45 Lead wire for positive electrode
46 Lead wire for negative electrode 41a Gas passage 41b Valve plate 81 Positive electrode terminal connection portion 82 Conductive plate connection portion

Claims (8)

A power supply device having a battery assembly in which a power generation element is housed in a straight tube-shaped battery case, and unit cells in which the battery case and a negative electrode terminal are electrically connected are arranged in a radial direction of the battery case. And
A conductive plate having a plurality of openings through which the single cells are inserted;
A conductive layer interposed between each opening and each battery case;
A power supply device comprising: the conductive plate; and a bus bar used for connection to a positive electrode terminal of another battery adjacent to the assembled battery.   The bus bar is connected to the conductive plate and extends in a direction perpendicular to the radial direction of the battery case, and extends from an end of the conductive plate connection portion to the positive terminal of the other battery. The power supply device according to claim 1, further comprising a positive electrode connection portion to be connected.   The other battery includes a power generation element housed in a straight tube-shaped battery case, and a plurality of unit cells in which the battery case and the negative electrode terminal are electrically connected are arranged in the radial direction of the battery case. The power supply apparatus according to claim 1, wherein the power supply apparatus is a battery pack. The conductive layer includes at least a resin body that expands due to a temperature rise, and a particle group made of a conductive filler mixed in the resin body,
When the temperature of the unit cell rises from an operating temperature to an abnormal temperature, the resin body thermally expands in the opening direction of the opening, thereby reducing the contact area between particles in the particle group. Item 4. The power supply device according to any one of Items 1 to 3.   5. The conductive plate is located in a region closer to the positive electrode terminal in the unit cell than the negative electrode terminal in the unit cell in a direction orthogonal to the radial direction of the battery case. The power supply device according to any one of the above.   In the direction perpendicular to the radial direction of the battery case, the battery case has a supply path for supplying a refrigerant to a portion of the battery case located in a region where the negative electrode terminal is located across the conductive plate. The power supply device according to claim 5.   A vehicle equipped with the power supply device according to any one of claims 1 to 6. A first step of forming a plurality of through-shaped openings in the conductive plate;
A unit cell in which a power generation element is accommodated in a straight tube-shaped battery case, and the battery case and the negative electrode terminal are electrically connected, and the outer diameter of the battery case is smaller than the diameter of the opening. A second step of inserting the unit cells through the plurality of openings while maintaining the non-contact state of the opening and the battery case;
A third step of filling a conductive paste in a gap formed between the opening and the battery case;
And a fourth step of connecting the conductive plate and a positive electrode terminal of another battery.

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