JP5530884B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device.

  As a background art regarding the technical field, for example, there is a technique disclosed in Patent Document 1. In Patent Literature 1, a plurality of bus bars connecting adjacent power supply modules and lead wires for detecting the voltage of each power supply module are provided by stopper claws provided on the main body of the end plate. The technique to hold is disclosed.

Japanese Unexamined Patent Publication No. 2000-223098

  In a power storage device having a plurality of capacitors, a plurality of capacitors arranged in a predetermined shape are electrically connected in series by a connecting conductor between one positive electrode side and the other negative electrode side of an adjacent capacitor, They are electrically connected in series. Further, in a power storage device having a plurality of capacitors, in order to avoid overcharging / discharging of the capacitors, it is necessary to grasp the state of each capacitor. For this reason, a voltage detection line for detecting the terminal voltage is electrically connected to each capacitor. When detecting the electrical series connection of a plurality of capacitors using a connecting conductor and the terminal voltage of each capacitor using a voltage detection line, the mounting method and the holding method must be considered. As one of the attachment method and holding method of the connection conductor and the voltage detection line, a method such as the technique disclosed in Patent Document 1 can be considered.

  However, as in the technique disclosed in Patent Document 1, in the method in which the holding member is provided with a stopper claw and the connection conductor and the voltage detection line are attached to the holding member and held, the connection conductor and the voltage detection line are held with respect to the holding member. It is necessary to attach each one, and workability is not necessarily good. Further, as in the technique disclosed in Patent Document 1, when a lead wire is used as the voltage detection line, the voltage detection line is attached to the holding member, the voltage detection line is wired from the capacitor to the control device, etc. Multiple operations are required. For this reason, when the number of voltage detection lines increases in accordance with the increase in the number of capacitors, the work for attaching and holding the voltage detection lines becomes complicated, and the workability is not necessarily good.

  The present application lists a plurality of problems including the above problems. Here, one of them is given as a representative problem to be solved by the invention, and the solution means will be described.

  Here, a representative problem to be solved by the present invention is to provide a power storage device with good workability.

  In addition, this other subject is replaced with the effect which reverses a subject in embodiment described below, and is demonstrated with the solution means.

The present invention, in order to solve the above representative problems, for example, at least one of the voltage detection board having a voltage detection line, and a holding member for holding a plurality of capacitors, electrically contacting a plurality of connection to continue a plurality of capacitors and a conductor, on a surface opposite to the capacitor holding side of the holding member, and electrically connected portion connected to the two capacitors to be connected, and a connection portion connected to one of the two capacitors A plurality of connection conductors having a crossing portion extending between the connection portions connected to the other of the two capacitors are arranged so as to be arranged in parallel in one direction of the holding member, and the plurality of connection conductors thus arranged over the transfer section, the voltage detection substrate extending in one direction of the holding member is disposed from one side of one-way retaining member connecting portions of a plurality of connecting conductors as over the other side, one-way retaining member a plurality of connection by the voltage detecting substrate extending Body characterized that you have given pressing the holding member.

  According to the present invention, a power storage device with good workability can be provided.

(Embodiment 1) The block diagram which shows the structure of the vehicle-mounted electrical system (vehicle drive system) containing the battery apparatus mounted in the hybrid vehicle. (Embodiment 1) FIG. 2 is a perspective view showing the external configuration of one battery block constituting the battery device of FIG. (Embodiment 1) It is a disassembled perspective view which shows the structure of the battery block of FIG. 2, and shows the arrangement structure of the some battery cell in a battery block, and the structure of side plate Assy. (Embodiment 1) An enlarged perspective view showing an enlarged configuration of a connector portion of a voltage detection board used in the side plate assembly shown in FIG. (Embodiment 1) An enlarged perspective view showing a part of the configuration of the side plate Assy of FIG. 3 in an enlarged manner. (Embodiment 1) The perspective view which shows the whole structure of the battery apparatus of FIG. (Embodiment 2) The perspective view which shows the external appearance structure of one whole battery block which comprises a battery apparatus. (Embodiment 2) It is a disassembled perspective view which shows the structure of the battery block of FIG. 7, and shows the arrangement structure of the some battery cell in a battery block, and the structure of side plate Assy. (Embodiment 2) An enlarged perspective view showing an enlarged configuration of a part of a voltage detection board used in the side plate assembly shown in FIG. (Embodiment 2) The perspective view which shows the structure of the bus-bar used for the side plate Assy of FIG. (Embodiment 2) An enlarged perspective view showing a part of the configuration of the side plate Assy of FIG. 8 in an enlarged manner. (Embodiment 2) The perspective view which shows the whole structure of the battery apparatus comprised using the battery block of FIG.

  First, an outline of an embodiment of the invention will be described.

  In an embodiment described below, the present invention constitutes an in-vehicle power supply device for an electric vehicle that is a moving body, particularly an electric vehicle, and a battery device (power storage device) including a secondary battery, particularly a lithium ion battery, as a capacitor. A case where this is applied to will be described as an example.

  As an example of an electric vehicle, a hybrid electric vehicle including an internal combustion engine and an electric motor as vehicle driving sources will be described as an example. The electric motor is the only driving source of the vehicle, and a commercial power source or a desk lamp is used. Other electric vehicles such as a genuine electric vehicle that can be recharged at a power source, a plug-in hybrid electric vehicle that is equipped with an engine and an electric motor as a vehicle drive source, and that can be charged with a commercial power source or a desk lamp. Absent. Examples of automobiles include ordinary passenger cars, passenger cars such as buses, cargo cars such as trucks, and special cars such as garbage trucks.

  As a power storage device constituting the in-vehicle power supply device, a lithium ion battery device provided with a lithium ion battery as a power storage device will be described as an example. However, other power storage devices such as a nickel hydride battery or a lead battery may be used. It does not matter.

  The configuration of the embodiment described below is installed in other electric vehicles, for example, railway vehicles such as hybrid trains, industrial vehicles such as battery-powered forklift trucks, vehicles equipped with construction machines such as cranes, vehicles engaged in civil engineering work, etc. It can also be applied to a power storage device.

  In addition, the configuration of the embodiment described below includes not only a power storage device that constitutes a mobile power supply device, but also an uninterruptible power supply device used in a computer system, a server system, etc., a power supply device used in a private power generation facility, The present invention can also be applied to a stationary power storage device that constitutes a power supply device used in power generation facilities using natural energy such as light, wind power, and geothermal heat.

  The battery device includes, as its constituent elements, a battery module including an assembled battery that is a battery group in which a plurality of battery cells are electrically connected in series, and controls the state of the assembled battery by monitoring the state of the assembled battery And a control device. The control device includes, as its constituent elements, voltage detection means for detecting each terminal voltage of the plurality of battery cells, and capacity adjustment means for adjusting the charging state of the plurality of battery cells (corresponding to each of the plurality of battery cells). Discharge (bypass) resistance provided, switching element for electrically connecting the discharge resistance to both electrodes of the battery cell when adjustment of the charge state is required, and a control unit for controlling on / off of the switching element) Communicating between the cell control device and the cell control device, transmitting a command signal to the cell control device to obtain the state of the plurality of battery cells, and controlling the state of the plurality of battery cells; and A battery for a higher-level control device (for example, a hybrid control device that controls hybrid vehicle control or a motor control device that controls the operation of an inverter device)置側 information, for example information indicating the state of charge of the battery pack, and a, a battery control unit for outputting such information that indicates the allowable charge-discharge amount for controlling the charging and discharging of the battery pack by the inverter device.

  The plurality of battery cells are electrically connected in series by electrically connecting one positive electrode side and the other negative electrode side of adjacent battery cells by a connection conductor called a bus bar in a plurality of battery cells arranged in a predetermined shape. Are connected in series. The terminal voltages of the plurality of battery cells are detected in order to avoid overcharging / discharging of the battery cells. For this reason, a voltage detection line is electrically connected to each battery cell. When the battery cells are electrically connected in series using the connection conductor and the terminal voltage of each battery cell is detected using the voltage detection line, a method for attaching and holding the connection conductor and the voltage detection line must be considered. As one of them, it is conceivable to attach and hold the connection conductor and voltage detection line on a holding member called a side plate that holds a plurality of battery cells, but depending on how to attach and hold, workability Will lead to a decline.

  Therefore, in the embodiment described below, a wiring board having voltage detection lines, a side plate that holds a plurality of battery cells, and a plurality of bus bars that electrically connect the plurality of battery cells in series are provided. By arranging a plurality of bus bars on the surface of the plate opposite to the surface on the battery cell holding side, arranging the wiring board on the plurality of bus bars, and fixing the wiring board to the side plate, the wiring board A plurality of bus bars are pressed against the side plate and fixed.

  According to such a configuration, it is not necessary to mount the bus bars and the voltage detection lines one by one on the side plate side. Also, compared to the case where a lead wire is used as the voltage detection line, a plurality of operations such as mounting of the voltage detection line on the side plate and wiring of the voltage detection line from the battery cell (bus bar) to the control device become unnecessary. Therefore, in the embodiment described below, the number of work steps is small and the work is not complicated, so that the assembly workability and productivity of the battery device can be improved.

  Further, according to the embodiment described below, a mechanism for mounting and holding the bus bar and the voltage detection line on the side plate becomes unnecessary, and the structure of the side plate can be simplified. Further, when the side plate is manufactured by resin molding, the mold necessary for resin molding does not become a complicated shape, and therefore the manufacturing unit price can be reduced.

  Furthermore, according to the embodiment described below, the voltage detection line is constituted by the wiring board, so that when the overcurrent flows from the battery cell, the electric connection between the battery cell and the control device is cut off. In addition, a fuse for preventing overcurrent from flowing to the control device via the voltage detection line and a thermistor for detecting the temperature of the battery cell can be integrally provided on the wiring board. And thermistor installation work can be simplified.

  Embodiments of the invention will be specifically described below with reference to the drawings.

Embodiment 1
1st Embodiment is described based on FIG. 1 thru | or FIG.

  First, the configuration of an in-vehicle electric system (electric motor drive system) including a battery device will be described with reference to FIG.

  The in-vehicle electric system includes a plurality of electrical devices including a motor generator 900, an inverter device 910, a vehicle controller 920 that controls the entire vehicle, and a battery device 1000 that constitutes the in-vehicle power supply device. The battery device 1000 includes a plurality of capacitors, and is configured as a lithium ion battery device including a plurality of lithium ion batteries, for example.

  Motor generator 900 is a three-phase AC machine. There are a synchronous machine and an induction machine as a three-phase AC machine, but either one may be adopted. The motor generator 900 is driven by a motor in an operation mode that requires rotational power, such as when the vehicle is powered and when an engine that is an internal combustion engine is started, and the generated rotational power is supplied to a driven body such as a wheel and an engine. . In this case, the in-vehicle electrical system converts DC power into three-phase AC power and supplies it to the motor generator 900 via the inverter device 910 that is a power converter from the battery device 1000.

  In addition, the motor generator 900 is driven by the driving force from the wheels or the engine in an operation mode that requires power generation, such as when the vehicle is decelerating or braking, or when the battery device 1000 needs to be charged. To generate three-phase AC power. In this case, the in-vehicle electrical system converts the three-phase AC power from the motor generator 900 into DC power via the inverter device 910 and supplies the DC power to the battery device 1000. Thereby, electric power is stored in the battery device 1000.

  The inverter device 910 is an electronic circuit device that controls the above-described power conversion, that is, conversion from DC power to three-phase AC power, and conversion from three-phase AC power to DC power by operation (on / off) of a switching semiconductor element. It is. The inverter device 910 includes a power module 911, a driver circuit 912, and a motor controller 913.

  The power module 911 is a semiconductor device that includes six switching semiconductor elements and constitutes a power conversion circuit for performing the power conversion described above by switching operations (on / off) of the six switching semiconductor elements.

  The DC positive module terminal is electrically connected to the DC positive external terminal, and the DC negative module terminal is electrically connected to the DC negative external terminal. The DC positive side external terminal and the DC negative side external terminal are power supply side terminals for transmitting and receiving DC power to and from the battery device 1000, and power cables 610 and 620 extending from the battery device 1000 are electrically connected. Yes. The AC side module terminal is electrically connected to the AC side external terminal. The AC side external terminal is a load side terminal for transmitting and receiving three-phase AC power to and from motor generator 900, and a load cable extending from motor generator 900 is electrically connected thereto.

  The motor controller 913 is an electronic circuit device for controlling the switching operation of the six switching semiconductor elements constituting the power conversion circuit. The motor controller 913 generates switching operation command signals (for example, PWM (pulse width modulation) signals) for the six switching semiconductor elements based on a torque command output from a host controller, for example, a vehicle controller 920 that controls the entire vehicle. To do. The generated command signal is output to the driver circuit 912.

Battery device 1000 is provided with a control equipment for managing and controlling the battery module for storing and releasing electrical energy (DC power charging and discharging) (storage module) 100, and the state of the battery module 100.

  The battery module 100 includes two battery blocks, that is, a high potential battery block 100a and a low potential battery block 100b that are electrically connected in series. Each battery block contains an assembled battery. Each assembled battery includes a connection body in which a plurality of lithium ion battery cells (hereinafter simply referred to as “battery cells”) are electrically connected in series. The configuration of each battery block will be described later.

  An SD (service disconnect) switch 700 is provided between the negative electrode side (low potential side) of the high potential battery block 100a and the positive electrode side (high potential side) of the low potential battery block 100b. The SD switch 700 is a safety device provided to ensure safety during maintenance and inspection of the battery device 1000, and is composed of an electric circuit in which a switch and a fuse are electrically connected in series. It is operated by a man during maintenance and inspection.

Control equipment is composed of a cell controller 200 corresponding to the upper battery controller 300 and the lower corresponding to (parent) (child).

  The battery controller 300 manages and controls the state of the battery device 1000, and notifies the vehicle controller 920 and the motor controller 913, which are host control devices, of charge / discharge control commands such as the state of the battery device 1000 and allowable charge / discharge power. For the management and control of the state of the battery device 1000, the voltage and current of the battery device 1000 are measured, the storage state (SOC: State Of Charge) and the deterioration state (SOH: State Of Health) of the battery device 1000, There are measurement of the temperature of the battery block, output of a command to the cell controller 200 (for example, a command for measuring the voltage of each battery cell, a command for adjusting the storage amount of each battery cell, etc.).

  The cell controller 200 is a limb of the so-called battery controller 300 that manages and controls the state of a plurality of battery cells according to a command from the battery controller 300, and includes a plurality of integrated circuits (ICs). Management and control of the state of a plurality of battery cells include measurement of the voltage of each battery cell, adjustment of the amount of electricity stored in each battery cell, and the like. Each integrated circuit has a plurality of corresponding battery cells, and performs state management and control on the corresponding plurality of battery cells.

  A plurality of corresponding battery cells are used as the power source of the integrated circuit constituting the cell controller 200. For this reason, both the cell controller 200 and the battery module 100 are electrically connected via the voltage detection line 800. The voltage of the highest potential of the corresponding plurality of battery cells is applied to each integrated circuit via the voltage detection line 800.

  Both the positive terminal of the high-potential side battery block 100 a and the direct current positive side external terminal of the inverter device 910 are electrically connected via a positive side power cable 610. The negative electrode terminal of the low-potential side battery block 100b and the DC negative electrode side external terminal of the inverter device 910 are electrically connected via a negative electrode power cable 620.

  A junction box 400 and a negative main relay 412 are provided in the middle of the power cables 610 and 620. Inside the junction box 400, a relay mechanism including a positive-side main relay 411 and a precharge circuit 420 is housed. The relay mechanism is an opening / closing unit for electrically connecting and disconnecting the battery module 100 and the inverter device 910. When the on-vehicle electric system is activated, the relay mechanism is connected between the battery module 100 and the inverter device 910. When the system is stopped or abnormal, the battery module 100 and the inverter device 910 are disconnected. Thus, by controlling between the battery apparatus 1000 and the inverter apparatus 910 with a relay mechanism, the high safety | security of a vehicle-mounted electrical machinery system is securable.

  The driving of the relay mechanism is controlled by a motor controller 913. The motor controller 913 outputs a conduction command signal to the relay mechanism to drive the relay mechanism by receiving a notification of the start completion of the battery device 1000 from the battery controller 300 when starting the in-vehicle electric system. Further, the motor controller 913 receives an output signal from the ignition key switch when the in-vehicle electric system is stopped, and receives an abnormal signal from the vehicle controller when the in-vehicle electric system is abnormal, thereby A relay command is driven by outputting a shutoff command signal.

  The main relay includes a positive side main relay 411 and a negative side main relay 412. The positive-side main relay 411 is provided in the middle of the positive-side power cable 610, and controls electrical connection between the positive side of the battery device 1000 and the positive side of the inverter device 910. The negative main relay 412 is provided in the middle of the negative power cable 620 and controls the electrical connection between the negative side of the battery device 1000 and the negative side of the inverter device 910.

  The precharge circuit 420 is a series circuit in which a precharge relay 421 and a resistor 422 are electrically connected in series, and is electrically connected to the positive-side main relay 411 in parallel.

  When starting the in-vehicle electric system, first, the negative side main relay 412 is turned on, and then the precharge relay 421 is turned on. Thereby, after the current supplied from the battery device 1000 is limited by the resistor 422, the current is supplied to the smoothing capacitor mounted on the inverter and charged. After the smoothing capacitor is charged to a predetermined voltage, the positive main relay 411 is turned on and the precharge relay 421 is opened. Thereby, the main current is supplied from the battery device 1000 to the inverter device 910 via the positive-side main relay 411.

  A current sensor 430 is housed in the junction box 400. The current sensor 430 is provided to detect a current supplied from the battery device 1000 to the inverter device 910. The output line of the current sensor 430 is electrically connected to the battery controller 300. The battery controller 300 detects the current supplied from the battery device 1000 to the inverter device 910 based on the signal output from the current sensor 430. The current detection information is notified from the battery controller 300 to the motor controller 913, the vehicle controller 920, and the like.

  The current sensor 430 may be installed outside the junction box 400. The current detection part of the battery device 1000 may be not only the inverter device 910 side of the positive main relay 411 but also the battery module 100 side of the positive main relay 411.

  Note that a voltage sensor for detecting the voltage of the battery device 1000 may be housed in the junction box 400. The battery controller 300 detects the overall voltage of the battery device 1000 based on the output signal of the voltage sensor. This voltage detection information is notified to the motor controller 913 and the vehicle controller 920. The voltage detection portion of the battery device 1000 may be on the battery module 100 side or the inverter device 910 side of the relay mechanism.

  Next, the configuration of the battery device 1000 will be described with reference to FIGS.

  As shown in FIG. 6, the battery device 1000 includes a battery module 100, a control device 12, an SD switch 700, and a junction box 400 as appearance components.

  The battery module 100 includes a high potential battery block 100a and a low potential battery block 100b. The high potential battery block 100a and the low potential battery block 100b are electrically connected in series via the SD switch 700.

  The high-potential side battery block 100a and the low-potential side battery block 100b are rectangular parallelepiped assemblies, and are arranged adjacent to each other in parallel so that the axes extending in the longitudinal direction of each block are parallel to each other. . The high-potential side battery block 100a and the low-potential side battery block 100b are juxtaposed on the module base 101 and fixed by fixing means such as bolts.

  In the space between the high-potential side battery block 100a and the low-potential side battery block 100b, the control device 12 and the SD switch 700 are arranged vertically in the longitudinal direction of the block.

  A junction box 400 is arranged on an extension line at one end (on the SD switch 700 side) in the longitudinal direction of the high potential battery block 100a and the low potential battery block 100b.

  The high potential battery block 100a and the low potential battery block 100b have exactly the same configuration. Therefore, in FIGS. 2 and 3, only the high potential battery block 100a side is shown as a representative of the high potential battery block 100a and the low potential battery block 100b. Hereinafter, only the configuration on the high potential battery block 100a side will be described.

  As shown in FIGS. 2 and 3, the exterior (housing) of the high-potential side battery block 100a has a rectangular parallelepiped (hexahedron) shape. A metal housing 2 formed by two opposing side surface portions, two flat plate members called side plates 3 opposed to the lateral direction of the rectangular parallelepiped, and opposed to the lateral direction of the rectangular parallelepiped, the side plate 3 Two plate-like members called side covers 130 (shown in FIG. 6 and not shown in FIG. 2) disposed on the outside are used as constituent members.

Since the metal housing 2 is cast and has a thickness compared to a housing made by bending a sheet metal, it has higher strength against external loads and impacts, and has dimensional accuracy of screw holes and machined surfaces. Since it is higher than sheet metal processing, it is easy to assemble with other parts. Specifically, the metal casing 2 is a die casting product (molded product) formed integrally by heating and melting an aluminum alloy, pouring the molten alloy into a metal mold, cooling and solidifying it. ).

  The metal housing 2 may be composed of two or more members cast in the same manner as described above, for example, a first member in which one of the bottom surface portion and the side surface portion in the longitudinal direction is integrally formed, A structure in which the other of the upper surface portion and the other side surface portion in the longitudinal direction is integrally formed with a bolt or the like may be used. Further, as the metal material, a metal material other than an aluminum alloy may be used as long as it is conductive and can be cast.

  Thus, according to the battery device 1000 of the present embodiment in which the high-potential side battery block 100a and the low-potential side battery block 100b are configured by adopting the metal casing 2 obtained by casting the metal material, the battery device 1000 Since the strength of the battery cell can be increased and the battery cell protection performance can be increased, the safety and reliability of the battery device 1000 can be improved.

  As shown in FIG. 3, the inside of the metal housing 2 is a storage chamber in which a plurality of cylindrical battery cells 8 are stored. This storage chamber also functions as a cooling chamber for the plurality of battery cells 8 as will be described later. The plurality of battery cells 8 are housed inside the metal housing 2 in a state of a battery pack in which the axial center of the cylinder is aligned with the short direction of the battery block.

  The side plate 3 is a molded body formed by molding an electrically insulating resin such as PBT, and is disposed so as to face the short side of the metal casing 2 and is fixed by a fixing means such as a bolt. It is fixed to the body 2.

  The plurality of battery cells 8 constituting the assembled battery are sandwiched and fixed by the side plate 3 and are insulated from the metal housing 2.

  The assembled battery includes a plurality of battery cells 8 arranged in parallel so that the direction of the electrodes changes alternately in the longitudinal direction of the battery block, and the same number as the first battery array. The battery cell 8 is configured by stacking in the height direction of the metal housing 2 a second battery array that is arranged in parallel so that the direction of the electrodes alternately changes in the longitudinal direction of the battery block. ing. The first and second battery rows are shifted in the longitudinal direction of the metal housing 2, and are stacked so that the first battery row arranged at the lower stage and the second battery row arranged at the upper stage are stacked. ing. The side plate 3 is provided with a through-hole in the short direction at a portion where the center of each battery cell 8 coincides with the center, and the diameter of the through-hole is smaller than the diameter of the battery cell 8.

The cylindrical battery cell 8 contains components such as a battery element (power generation element), an electrolytic solution, and a safety valve inside a battery housing, and is sealed by a battery lid. The battery element is a wound body in which a laminate in which a positive electrode material, a separator as an insulating material, a negative electrode material, and a separator are laminated in four layers is wound in a roll shape. The battery casing is a metal cylindrical can. The battery lid is a sealing member that is attached to the open end side of the battery casing and closes the open end side of the battery casing after the battery element, electrolyte, and safety valve are housed inside the battery casing. A positive electrode is formed. The negative electrode is formed on the closed end side of the end opposite to the open end side of the battery casing. The safety valve is a degassing valve that is opened when the pressure inside the battery casing increases, and discharges the generated medium (gas) generated inside the battery casing to the outside. The output voltage of the battery cell 8 is 3.0-4.2v. The average output voltage is 3.6v. Moreover, the battery cell 8 is covered with a resin tube on the peripheral side surface of the battery can for insulation from peripheral components and other batteries.

  As shown in FIGS. 2 and 3, the plurality of battery cells 8 are electrically connected in series by a plurality of conductive members (connection conductors) called bus bars 4. The bus bar 4 is composed of a thin rectangular (strip-shaped) metal plate (for example, a copper plate). The bus bar 4 is not insert-molded integrally with the side plate 3 and has a separate structure from the side plate 3. The planar portions at both ends of the bus bar 4 are joined to the electrode portions of the two battery cells by welding. The flat portion of the central portion of the bus bar 4 (the crossing portion that crosses between the welded portions with the two battery cells) is arranged at a position higher than the welded portion with the battery cells so as to avoid the side plate 3. It is bent at a right angle from the welded portion with the cell and lifted up to a position over the wall between the through holes of the side plate 3.

  In the present embodiment, one electrode (for example, positive electrode) of the battery cells 8 in the first battery row disposed in the lower stage and the other electrode of the battery cells 8 in the second battery array disposed in the upper stage adjacent thereto. (For example, negative electrode) are electrically connected in the height direction of the battery block in order from one end to the other end. For this reason, the bus bars 4 are arranged in parallel in the longitudinal direction of the side plate 3 so that the bus bars 4 extend obliquely in the height direction of the battery block at the center in the short direction of the side plate 3.

  In addition, the connection method of the bus bar 4 and the battery cell 8 will not be specifically limited if electrically connected, The connection by welding may be sufficient and the connection by bolt fixation may be sufficient.

  The outer peripheral portion of the side plate 3 has a structure protruding outward, that is, on the side opposite to the storage chamber of the battery cell 8, and constitutes an outer peripheral wall over the entire periphery. The outer side of the outer peripheral wall has a planar shape and protrudes outward from the central portion of the bus bar 4.

  In order to take out the voltage from the plurality of battery cells 8 electrically connected in series, the DC positive electrode side input terminal 170a is connected to the positive electrode of the battery cell 8 having the highest potential among the plurality of battery cells 8 electrically connected in series. Are electrically connected, and the negative input terminal 170b is electrically connected to the negative electrode of the battery cell 8 having the lowest potential among the plurality of battery cells 8 electrically connected in series. The DC positive electrode side input terminal 170a is provided so as to protrude in the horizontal direction from the upper part of the surface opposite to the battery cell 8 holding side at one end in the longitudinal direction of the side plate 3 on one side. The DC negative electrode side input terminal 170b is provided so as to protrude in the horizontal direction from the upper part of the surface opposite to the battery cell 8 holding side at the other end in the longitudinal direction of the side plate 3 on one side. The direct current positive electrode side input terminal 170a and the direct current negative electrode side input terminal 170b are made of thin metal plates (for example, copper plates).

  A cover member 130 called a side cover is provided outside the side plate 3, that is, on the side opposite to the storage chamber of the battery cell 8. The covering member 130 is fixed to the side plate 3 by fixing means such as bolts. The covering member 130 is fixed to the outer peripheral wall portion of the side plate 3 and is not electrically in contact with the bus bar 4, the DC positive electrode side input terminal 170 a and the DC negative electrode side input terminal 170 b. The covering member 130 is a flat plate obtained by pressing a metal plate such as iron or aluminum, and has a surface shape substantially the same as the planar shape of the side plate 3. As the covering member 130, a flat plate formed by molding a resin such as PBT may be used. A seal member such as an O-ring is provided between the side plate 3 and the cover member 130, and a space formed between the side plate 3 and the cover member 130, that is, a mist discharged from the battery cell 8. The gas tightness of the gas discharge chamber for storing and discharging the gas (the generation medium described above) is enhanced.

  As shown in FIGS. 2 and 3, a cooling medium outlet 180 that forms a discharge port of cooling air that is a cooling medium from the inside of the metal casing 2 is formed on the side surface portion on one side in the longitudinal direction of the metal casing 2. Has been. Further, the cooling medium inlet for taking cooling air into the metal housing 2 is the side surface portion on the other side in the longitudinal direction of the metal housing 2 (the side surface portion opposite to the side surface portion on which the cooling medium outlet 180 is formed). Is formed. The cooling medium inlet and the cooling medium outlet 180 are rectangular through holes, and are arranged so as to be shifted from each other in the height direction of the metal casing 2. In the present embodiment, the case where the cooling medium inlet is formed at a position higher than the cooling medium outlet 180 is shown, but the positional relationship may be reversed.

  In a state where a plurality of battery cells 8 are arranged inside the metal housing 2, each part (upper surface portion, bottom surface portion, two side surface portions) constituting the metal housing 2 and an aggregate of the plurality of battery cells 8 A gap is formed between them. Further, gaps are formed between the plurality of battery cells 8. These gaps communicate with each other, and the cooling air introduced from the cooling medium inlet forms a cooling flow path. The cooling air introduced from the cooling medium inlet flows through the cooling flow path, cools the plurality of battery cells 8, and is discharged from the cooling medium outlet 180.

  The side plate 3 is provided with a voltage detection substrate 5 having a plurality of voltage detection conductors (not shown) for detecting the respective voltages of the plurality of battery cells 8. The voltage detection board 5 is an elongated and wave-shaped member extending in the same direction as the longitudinal direction of the battery block, and a plurality of bus bars 4 are arranged so that the central portion of the bus bars 4 extends from one side to the other side in the longitudinal direction of the battery block. It is arrange | positioned on the center part of this bus-bar 4, and is being fixed to the side plate 3 with the screw 11. FIG. According to such a configuration, the plurality of bus bars 4 can be pressed against the side plate 3 and fixed by the voltage detection substrate 5.

  The side plate Assy 6 is fixed to the metal housing 2 by a plurality of screws 9. The voltage detection board 5 of the side plate Assy 6 and all the bus bars 4 are electrically connected by fastening with screws 10. A connector 5b is provided on the surface of the one side plate Assy6 on the battery cell 8 side at one end in the longitudinal direction of the voltage detection board 5, and a connector 5a is provided on the opposite side of the battery cell 8 side. Yes. A flat cable 7 extending from the voltage detection board 5 of the other side plate Assy 6 is connected to the connector 5b. The connectors of the harnesses 13 and 14 extending from the control device 12 are connected to the connector 5a. Thereby, the voltage detection line of the voltage detection board 5 of the side plate Assy 6 on both sides and the control device 12 (cell controller) can be electrically connected, and the terminal voltage of each battery cell 8 is taken into the control device 12 and detected. be able to.

  A thin metal plate 5c and a fuse are mounted on the voltage detection substrate 5. There is a hole e on the voltage detection substrate 5 and a hole d on the metal thin plate 5c. The bus bar 4 has a hole f and a screw hole g. The bus bar 4 is positioned on the side plate 3 by combining the hole f of the bus bar 4 and the protrusion j of the side plate 3. In addition, the voltage detection substrate 5 is fixed to the hole h on the side plate 3 with the screw 11 through the hole e. When the voltage detection board 5 is fixed to the side plate 3, the bus bar 4 is temporarily fixed by being sandwiched between the side plate 3 and the voltage detection board 5.

  As described above, in the present embodiment, the side plate Assy 6 (sub module) is configured by the side plate 3, the plurality of bus bars 4 and the voltage detection substrate 5. If the side plate Assy 6 is configured in advance when the battery block is assembled, it is easy to assemble the parts, and the positioning of the welding between the battery cell 8 and the bus bar 4 is easy. 4 can prevent the bus bar 4 from being displaced during welding. Further, the bus bar 4 from the side plate 3 does not come off. Therefore, workability at the time of battery block assembly work can be improved.

[Embodiment 2]
A second embodiment will be described with reference to FIGS.

  In the present embodiment, the relay substrate 27 is provided at one end portion in the longitudinal direction of the metal housing 2, and the side plate Assy 6 is configured by the side plate 3, the bus bar 4, and the flexible voltage detection line 25. The relay board 27 is fixed to the metal housing 2 by screws 28 and includes connectors 27a and 27b. The two connectors 27a and 27b are electrically connected. One end of a voltage detection line 25 extending from the side plates Assy6 on both sides is connected to the two connectors 27a. Flat cables 32 and 33 extending from the control device 12 are connected to the connector 27b.

  The voltage detection line 25 includes a flexible printed board p and a reinforcing plate m. A fuse pattern is printed on the flexible printed circuit board p and has a fuse function. The flexible printed circuit board p has a branch portion q, and the reinforcing plate m has a hole n. On the other hand, a branch portion r exists in the center portion of the bus bar 4, and has a shape that can be electrically connected to the branch portion q of the voltage detection line 25. The bus bar 4 is positioned on the side plate 3 by combining the hole s of the bus bar 4 and the protrusion t of the side plate 3. The hole n of the voltage detection line 25 is combined with the protrusion u of the side plate 3 and fixed by welding. By fixing the voltage detection line 25 to the side plate 3, the bus bar 4 is temporarily fixed by being sandwiched between the side plate 3 and the voltage detection line 25.

  Configurations other than those described above are the same as those in the first embodiment. The same components as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and the description thereof is omitted.

  Also in the present embodiment, the same effects as in the first embodiment can be obtained, and the voltage detection lines 25 are all drawn from the center of the bus bar 4, so that the resistance due to the voltage measurement location is independent of the direction of the bus bar 4. High-accuracy voltage detection with little variation in values can be performed.

Claims (6)

A plurality of capacitors,
A plurality of connection conductors for electrically connecting the plurality of capacitors;
At least one voltage detection board having a voltage detection line for detecting a terminal voltage of the plurality of capacitors;
A holding member for holding the plurality of capacitors,
On the surface of the holding member opposite to the capacitor holding side, a connecting portion connected to the two capacitors that are electrically connected, and a connecting portion connected to one of the two capacitors and the two The plurality of connection conductors having a crossing portion extending between the connection portions connected to the other side of the capacitor are arranged so as to be arranged in parallel in one direction of the holding member, and the plurality of connection conductors arranged over the transfer section, the voltage detection substrate extending in one direction of the holding member is arranged to span the other side of the connecting portions of the plurality of connecting conductors from one side of the one-way of the holding member, wherein wherein the plurality of connecting conductors are pressed into the holding member by the voltage detection substrate extending in one direction of the holding member,
A power storage device. A plurality of capacitors,
A submodule disposed with respect to the plurality of capacitors,
The submodule is
A plurality of connection conductors for electrically connecting the plurality of capacitors;
At least one voltage detection board having a voltage detection line for detecting a terminal voltage of a plurality of capacitors;
A holding member for holding the plurality of capacitors,
On the surface of the holding member opposite to the capacitor holding side, a connecting portion connected to the two capacitors that are electrically connected, and a connecting portion connected to one of the two capacitors and the two The plurality of connection conductors having a crossing portion extending between the connection portions connected to the other side of the capacitor are arranged so as to be arranged in parallel in one direction of the holding member, and the plurality of connection conductors arranged over the transfer section, the voltage detection substrate extending in one direction of the holding member is arranged to span the other side of the connecting portions of the plurality of connecting conductors from one side of the one-way of the holding member, wherein the Rukoto pressed against the plurality of connecting conductors to the holding member by the voltage detection substrate extending in one direction of the holding member, the holding member, in which the plurality of connecting conductors and the voltage detection substrate is integrated ,
A power storage device. The power storage device according to claim 1 or 2,
The voltage detection board is a printed circuit board;
A power storage device. The power storage device according to claim 3,
A fuse is mounted on the printed circuit board.
A power storage device. The power storage device according to claim 1 or 2,
The voltage detection board is obtained by bonding a flexible printed board on a reinforcing plate.
A power storage device. The power storage device according to claim 5,
A fuse pattern is printed on the flexible printed circuit board,
A power storage device.

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