JP2009289428A - Power source control device of battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve connection of a unit cell and a relay substrate in a manner of easy assembly and simple constitution. <P>SOLUTION: A power source control device of a battery pack formed by housing a plurality of battery modules each of which is formed by connecting a plurality of unit cells in series in a battery housing box in parallel, and by connecting battery modules in series includes: a battery control unit controlling the voltage of the battery pack and each battery module; and a plurality of bus bars installed between the battery module and the battery control unit, and elastically connecting a positive electrode and a negative electrode of adjacent unit cells. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a battery pack power supply control device configured by connecting a plurality of battery modules in series.

  Nickel-hydrogen storage batteries, lithium ion storage batteries, etc. used as power sources for drive motors in electric vehicles that run only with motors or hybrid vehicles that run with engines and motors are generally connected in series. Thus, a battery module is configured, and a plurality of the battery modules are stored in a battery storage box, and these are connected in series to form a battery pack.

  For example, as a power source for a drive motor for an electric vehicle or a hybrid vehicle, a sealed nickel-hydrogen storage battery that is excellent in basic characteristics such as energy density, output density, and cycle life is mainly used. In recent years, lithium ion batteries having higher basic performances such as energy density have attracted attention, and research and development has been actively conducted for practical use.

  The assembled battery as a high-voltage battery is connected to a traveling motor via a contactor, a fuse, and a breaker (breaker), and further via a power drive unit (PDU). Here, when parts having a high voltage battery protection function such as contactors, fuses, breakers, etc. are dispersed and arranged in various parts of the vehicle, the maintenance performance is deteriorated, so various arrangements have been proposed conventionally. .

  For example, in Japanese Patent Application Laid-Open No. 11-162445, a plurality of battery modules are stored in a battery storage box, and an empty space for two battery modules is provided. A configuration in which a main contactor relay and a safety plug (breaker) are housed in a connection box has been proposed.

  Japanese Patent Laid-Open No. 8-162171 discloses a voltage detection circuit connected between both ends of each battery module of an assembled battery, and a signal converter that converts the output of the voltage detection circuit into a digital signal and outputs it serially. A battery pack monitoring device has been proposed in which a voltage measurement unit including a transmission circuit or the like is provided in the vicinity of a corresponding battery module.

Adjacent unit cells in the battery module are arranged so that a positive electrode and a negative electrode are adjacent to each other, a bus bar module having a plurality of bus bars is mounted on the battery module, and each battery module is connected to a battery control unit (battery via the bus bar module). ECU). Conventionally, the bus bars are attached to the electrodes of the adjacent unit cells by screwing as shown in, for example, Japanese Patent Application Laid-Open No. 2003-45409.
JP-A-11-162445 JP-A-8-162171 JP 2003-45409 A

  As described in Patent Document 3, conventionally, since the bus bar is fixed to the adjacent unit battery by screwing, there is a problem that the number of assembling steps is increased.

  The present invention has been made in view of the above points, and the object of the present invention is to easily connect and connect between adjacent unit cells and between the unit cells and the battery control unit. It is an object of the present invention to provide an assembled battery power control device having a realizable bus bar module.

  According to the first aspect of the present invention, there is provided an assembled battery power control device in which a plurality of battery modules configured by connecting a plurality of unit cells in series are arranged in parallel in a battery storage box, and the battery modules are connected in series. A battery control unit for controlling the voltage of the assembled battery and each battery module, and a plurality of bus bars provided between each battery module and the battery control unit and elastically connecting the positive electrode and the negative electrode of the adjacent unit cells. A battery pack power supply control device comprising: a plurality of bus bar modules.

  According to a second aspect of the present invention, in the first aspect of the present invention, each bus bar is composed of a lead pin integrated bus bar in which lead pins for connecting to a relay board are integrally formed. A control device is provided.

  According to the first aspect of the present invention, when the bus bar module is attached to the battery module, the bus bar is elastically connected to the electrode of the unit battery, so that the conventional screw fixing can be eliminated and the number of assembling steps can be reduced. Furthermore, it is possible to suppress the stress applied to each unit battery as compared with screw fixing.

  According to the second aspect of the invention, by using the lead pin integrated bus bar, the connection between the unit battery and the relay substrate can be realized with a simple configuration, and the number of assembling steps can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Referring to FIG. 1, an exploded perspective view of an assembled battery 2 according to an embodiment of the present invention is shown. Reference numeral 4 denotes a battery storage box of the assembled battery 2, which is formed of, for example, a resin molded product.

  The battery storage box 4 is divided into two storage spaces by a partition plate 6 extending in the lateral direction, and three battery modules 10 are stored in each storage space, and a total of six battery storage boxes 4 are stored in the battery storage box 4. The battery module 10 is housed. A plurality of engaging grooves 8 extending in the vertical direction are formed in the partition plate 6.

  The battery module 10 is configured by, for example, eight unit batteries (cells) 12 connected in series. The unit battery 12 is composed of, for example, a lithium ion battery, and the output voltage of one unit battery is 3.6V. Since the assembled battery 2 of the present embodiment is configured by connecting six battery modules 10 in series, the output voltage of the assembled battery 2 is 3.6 × 8 × 6 = 172.8V.

  As shown in the enlarged view of FIG. 2, a bus module 14 having a plurality of bus bars (eight in this embodiment) 30 on the eight unit cells 12 is formed in a downward direction integrally formed with the resin board 16. The battery module 10 is configured by mounting a plurality of extending engaging claws 44 by engaging with the engaging grooves 8 of the partition plate 6.

  On the resin board 16, six lead pin integrated bus bars 30 are mounted by being inserted into the bus bar holding portion 34. The lead pin integrated bus bar 30 has a lead pin 32.

  Since the bus bar holding portion 34 is formed integrally with the resin board 16 and has a pair of openings 48 at both ends of the holding portion 34 as shown in FIG. 3, when the bus bar 30 is inserted into the holding portion 34. Both ends of the bus bar 30 protrude downward from the opening 48.

  Therefore, when the bus bar module 14 is mounted on the eight unit cells 12, the bus bar 30 is connected to the positive electrode 28a and the negative electrode 28b of the adjacent unit cells 12 as shown in FIGS.

  The resin board 16 further includes two positioning pins 36 formed on the diagonal extension of the opening 46 and six locking claws 42 extending upward. Reference numeral 18 denotes a relay board having two positioning holes 38 into which the positioning pins 36 of the connector 20 and the resin board 16 are inserted, and eight through holes 40 into which the lead pins 32 of the lead pin integrated bus bar 30 are inserted. ing.

  As shown in FIG. 1, a connector 20 mounted on each relay board 18 is fitted into a connector 24 connected to a harness 22, and the connector 26 at the end of the harness 22 is a battery signal of the battery ECU 50 shown in FIG. Connected to processing terminal.

  In order to mount and fix the relay board 18 on the resin board 16, the relay board 18 is positioned so that the positioning pins 36 of the resin board 16 are inserted into the positioning holes 38 of the relay board 18. As shown in FIG. 5, the relay board 18 is locked from above by the engaging claws 42.

  As a result, the lead pins 32 of the lead pin integrated bus bar 30 are inserted into the through holes 40 formed in the relay substrate 18, and each lead pin 32 is soldered and connected to the relay substrate 18.

  According to the power supply control device for the assembled battery 2 of the present embodiment, the bus bar modules 14 are mounted on the eight unit batteries 12 arranged side by side with one-touch engagement, so that the positive electrodes of the unit batteries 12 arranged adjacent to each other. Since the 28a and the negative electrode 28b are elastically connected to the lead pin integrated bus bar 30, the conventional screw fixing of the bus bar can be eliminated, and the number of assembling steps can be reduced with a simple configuration. Furthermore, it is possible to suppress the stress on each unit battery 12 as compared with screw fixing.

  Referring to FIG. 6, a block circuit diagram of the assembled battery 2 of the above-described embodiment is shown. The connector 24 is connected to the connector 20 mounted on the relay board 18, and each relay board 18 is connected to the battery signal processing terminal of the battery ECU 50 via the harness 22. Therefore, the battery ECU 50 can always detect the voltage of each cell 12, the voltage of each battery module 10, the assembled battery 2, and the like.

  The contactor 54 includes a precharge contactor 54a and a main contactor 54b. When the ignition switch of the automobile is turned on, the precharge contactor 54a is first turned on, and then the main contactor 54b is turned on with a predetermined delay.

  The positive terminal of the assembled battery 2 is connected to the positive terminal of a PDU (power drive unit) 60 and the positive terminal of a DV (down converter) 64. On the other hand, the negative terminal of the assembled battery 2 is connected to the negative terminal of the PDU 60 and the negative terminal of the DV 64.

  Thereby, the assembled battery 2 drives the motor 62 via the PDU 60 and charges the 12V storage battery 66 by reducing the voltage to 12V by the DV 64. Further, a fuse 56 and a breaker 58 are interposed between the six battery modules 10 connected in series.

It is a disassembled perspective view of the assembled battery which concerns on this invention embodiment. It is a disassembled perspective view of a battery module. It is a back surface side perspective view of a resin board. It is an expansion perspective view of a lead pin integrated busbar part. It is a principal part expansion perspective view of a battery module. It is a block circuit diagram of an assembled battery.

Explanation of symbols

2 Battery pack 4 Battery storage box 6 Partition plate 8 Engaging groove 10 Battery module 12 Unit battery (cell)
14 Bus Bar Module 16 Resin Board 18 Relay Board 30 Lead Pin Integrated Bus Bar 42, 44 Engaging Claw 50 Battery ECU
56 Fuse 58 Breaker 60 PDU
62 Motor 64 Down converter

Claims (2)

A battery module configured by connecting a plurality of unit cells in series and arranged in parallel in a battery storage box, and a battery pack power supply control device in which each battery module is connected in series,
A battery control unit for controlling the voltage of the assembled battery and each battery module;
A plurality of bus bar modules provided between each battery module and the battery control unit, and having a plurality of bus bars that elastically connect the positive electrode and the negative electrode of adjacent unit cells;
A battery pack power supply control device comprising:   2. The battery pack power supply control device according to claim 1, wherein each bus bar comprises a lead pin integrated bus bar integrally formed with a lead pin for connecting a relay board.

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