Abstract:
A power supply control apparatus includes: a control board that is configured to control a voltage of a battery module; and a bus bar module that is configured to electrically connect the control board to the battery module, the control board and the bus bar module are arranged in a stacked manner, and the bus bar module includes a plurality of bus bars that are made to be independent by cutting off junctions connecting the bus bars to each other and a resin member that supports the bas bars in a state where the junctions are exposed.

Description:
This is the U.S. national stage of application No. PCT/JP2012/075788, filed on 4 Oct. 2012. Priority under 35 U.S.C. §119(a) and 35 U.S.C. §365(b) is claimed from Japanese Application No. 2011-225913, filed 13 Oct. 2011, the disclosure of which is also incorporated herein by reference. 
     TECHNICAL FIELD OF THE INVENTION 
     The present invention relates to a power supply control apparatus and a manufacturing method of the power supply control apparatus. 
     Priority is claimed on Japanese Patent Application No. 2011-225913, filed Oct. 13, 2011, the content of which is incorporated herein by reference. 
     BACKGROUND ART 
     A battery system mounted on a hybrid vehicle or an electric vehicle includes a control board that detects a voltage of a battery so as to prevent degradation of the battery due to overcharge or the like. As described in Patent Document 1, the control board is installed on a battery module including multiple batteries and is electrically connected to the respective batteries. 
     PRIOR ART DOCUMENTS 
     Patent Documents 
     Patent Document 1: Japanese Unexamined Patent Application, First Publication No. 2010-56035 
     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     On the other hand, a bus bar module may be disposed between the battery module and the control board, because of a difference in arrangement position or shape between connection terminals of the battery module and connection terminals of the control board. 
     The bus bar module includes bus bars and a resin member supporting the bus bars and connects the connection terminal of the battery modules and the connection terminals of the control board to each other. 
     The bus bar module and the control board serve as a power supply control apparatus in cooperation with each other. That is, the above-mentioned battery system has a configuration in which the power supply control apparatus is installed on the battery module. 
     The bus bar module includes conductive bus bars and the resin member supporting the bus bars. One connection terminal of the battery module and one connection terminal of the control board are electrically connected to each other with one bus bar. Since the battery module and the control board each include multiple connection terminals, the bus bar module includes multiple bus bars. 
     The bus bar module is generally manufactured by insert molding. However, since the number of bus bars is large, it is difficult to accurately position the bus bars. The handling properties of the bus bars at the time of manufacturing the bus bar module are poor and thus workability is also poor. 
     The bus bars may have various shapes depending on the arrangements of two connection terminals to be electrically connected to each other. Accordingly, in order to form all the bus bars of the bus bar module, for example, multiple molds are necessary, thereby causing an increase in manufacturing costs. 
     The present invention is made in consideration of the above-mentioned problem and an object thereof is to easily manufacture a power supply control apparatus by improving workability at the time of manufacturing a bus bar module and to reduce the manufacturing cost of the power supply control apparatus by reducing the manufacturing cost of the bus bar module. 
     Means for Solving the Problems 
     The present invention employs the following configurations as measures for achieving the above-mentioned object. 
     (1) According to an aspect of the present invention, there is provided a power supply control apparatus including: a control board that is configured to control a voltage of a battery module; and a bus bar module that is configured to electrically connect the control board and the battery module, wherein the control board and the bus bar module are arranged in a stacked manner, and the bus bar module includes a plurality of bus bars that are made to be independent by cutting off junctions connecting the bus bars to each other and a resin member that supports the bas bars in a state where the junctions are exposed. 
     (2) In the power supply control apparatus according to (1), the resin member may include an opening portion that penetrates the resin member form the front surface thereof to the rear surface thereof 
     (3) In the power supply control apparatus according to (2), the junctions may be exposed from the opening portion. 
     (4) According to another aspect of the present invention, there is provided a manufacturing method of a power supply control apparatus which includes a control board that controls a voltage of a battery module and a bus bar module that electrically connects the control board and the battery module, in which the control board and the bus bar module are arranged in a stacked manner, the manufacturing method including: integrally molding a bus bar assembly including a plurality of bus bars connected to each other by junctions and a resin member so as to expose the junctions; and making the bus bars to be independent by cutting off the junctions after the integral molding. 
     Effect of the Invention 
     According to aspects of the present invention, the bus bars are made to be independent by cutting off the junctions connecting the bus bars to each other. The bus bar module can be manufactured by molding the multiple bus bars together in a state (bus bar assembly) in which the multiple bus bars are connected to each other with the junctions, incorporating the bus bar assembly and the resin member into a body, and then cutting off the junctions. Therefore, according to aspects of the present invention, it is possible to manufacture the bus bar module by insert-molding the bus bar assembly in which the multiple bus bars are incorporated into a body and it is thus possible to more easily manufacture the bus bar module in comparison with a case where the bus bar module is manufactured by insert-molding individual bus bars. According to aspects of the present invention, since the manufacturing of the bus bar module is facilitated in this way, it is possible to easily manufacture the power supply control apparatus. Additionally, according to aspects of the present invention, the bus bar assembly can be formed using one mold. Accordingly, it is not necessary to prepare a mold for each bus bar and it is thus possible to reduce the manufacturing cost of the bus bar module. According to aspects of the present invention, since the manufacturing cost of the bus bar module is reduced in this way, it is possible to reduce the manufacturing cost of the power supply control apparatus. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is an exploded perspective view illustrating a battery system including a power supply control apparatus according to an embodiment of the present invention. 
         FIG. 2A  is a plan view illustrating the power supply control apparatus according to the embodiment of the present invention including a control board and screws. 
         FIG. 2B  is a plan view illustrating the power supply control apparatus in which the control board and screws are omitted. 
         FIG. 3  is a perspective view illustrating the control board of the power supply control apparatus according to the embodiment of the present invention. 
         FIG. 4  is a plan view illustrating a state before multiple bus bars of the power supply control apparatus according to the embodiment of the present invention are made to be independent. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, a power supply control apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the following drawings, in order to make members recognizable, scales of the members are appropriately changed. 
       FIG. 1  is an exploded perspective view schematically illustrating a configuration of a battery system  100  including a power supply control apparatus  1  according to this embodiment. As illustrated in the drawing, the battery system  100  includes a battery module  101 , a power supply control apparatus  1  according to this embodiment, and a cover  110 . 
     The battery module  101  includes batteries  102 , a terminal block  103 , and a not-illustrated fixed block. The battery  102  is a storage battery which can be charged and discharged and has terminals disposed on the upper portion thereof 
     The multiple batteries  102  are fixed to the not illustrated fixed block. The batteries  102  are arranged in the same form. The terminal block  103  is a block for fixing connection terminals of the batteries  102  and includes connection terminals for electrically connecting the batteries  102  to the power supply control apparatus  1 . The connection terminals of the terminal block  103  are disposed in a predetermined arrangement pattern on a top surface of the terminal block  103 . Since the connection terminals disposed on the top surface of the terminal block  103  serve as connection terminals for electrically connecting the battery module  101  to the power supply control apparatus  1 , the connection terminals disposed on the top surface of the terminal block  103  are referred to as connection terminals of the battery module  101  in the following description. 
     The power supply control apparatus  1  according to this embodiment is disposed on the battery module  101  and includes a bus bar module  2 , a control board  3 , and screws  4 . The bus bar module  2  and the control board  3  are stacked with the bus bar module  2  located on the lower side (the side of the battery module  101 ) and the control board  3  located on the upper side (the opposite side of the battery module  101 ) and are integrated by fastening using the screws  4 . 
     Hereinafter, the power supply control apparatus  1  according to this embodiment will be described in more detail with reference to  FIGS. 2A to 4 .  FIGS. 2A and 2B  are plan views of the power supply control apparatus  1  according to this embodiment.  FIG. 2A  is a plan view of the power supply control apparatus  1  in which the control board  3  and the screws  4  are included.  FIG. 2B  is a plan view (that is, only the bus bar module  2  is illustrated) of the power supply control apparatus  1  in which the control board  3  and the screws  4  are omitted.  FIG. 3  is a perspective view illustrating only the bus bar module.  FIG. 4  is a plan view illustrating a state (bus bar assembly  10 ) before bus bars  2   a  to be described later of the bus bar module  2  are made to be independent. 
     The bus bar module  2  is a member for electrically connecting the battery module  101  and the control board  3 , which are different in arrangement positions or shapes of connection terminals, to each other and includes multiple bus bars  2   a  and a resin member  2   b  supporting the bus bars  2   a.    
     The bus bar  2   a  is a metal pattern formed of a conductive material such as copper. One end of the bus bar  2   a  is formed as a substantially square connection terminal  2   c  and the other end is formed as a lead pin  2   d.    
     The bus bars  2   a  are provided to correspond to the number of connection terminals of the battery module  101 . Each of the bus bars  2   a  has a connection terminal  2   c . The connection terminals  2   c  of the bus bars  2   a  are arranged to have the same height as the surroundings of the resin member  2   b  and are disposed at positions corresponding to the connection terminals of the battery module  101 . 
     Each connection terminal  2   c  is provided with a through-hole  2   e . The bus bar module  2  is fixed to the battery module  101  by screws (not illustrated) inserted into the through-holes  2   e , and the connection terminals  2   c  are electrically connected to the connection terminals of the battery module  101 . 
     The lead pins  2   d  of the bus bars  2   a  are gathered in an opening portion  2   f  formed on one side (the left side in  FIG. 2B ) of the resin member  2   b , and are arranged to be exposed from the opening portion  2   f . The tip of each lead pin  2   d  is bent toward the control board  3 . 
     By bonding the lead pins  2   d  to the connection terminals of the resin member  2   b  by soldering, the bus bar module  2  is electrically connected to the control board  3 . 
     Each bus bar  2   a  includes a bent portion  2   g  which is bent outside the resin member  2   b  and connected to the corresponding connection terminal  2   c . The bent portion  2   g  is formed by bending a part of the bus bar  2   a  so as to rise upward to form a step as illustrated in  FIG. 3 . The bent portion  2   g  has a thickness and a width permitting deformation when a load acts on the corresponding connection terminal  2   c  and thus has flexibility. 
     In the power supply control apparatus  1  according to this embodiment, the bus bars  2   a  arranged on the right side in  FIG. 2B  with respect to an opening portion  2   f  (see  FIG. 2B ) to be described later become independent bus bars  2   a  by cutting off the junctions  11  connecting the bus bars to each other. That is, as illustrated in  FIG. 4 , the multiple bus bars  2   a  are a part of the bus bar assembly  10  in which the neighboring bus bars  2   a  are connected to each other with the junctions  11  before the junctions  11  are cut off. The junctions  11  are formed of the same material as the bus bars  2   a . In  FIG. 4 , the junctions  11  are illustrated as black in order to improve visibility. 
     The resin member  2   b  is a substantially rectangular plate-like member formed of a resin supporting the bus bars  2   a . The resin member  2   b  is formed of, for example, a polyphenylene sulfide resin (PPS). The resin member  2   b  has the opening portion  2   f  for exposing the lead pins  2   d , as illustrated in  FIG. 2B . Positioning pins  2   h  for positioning the control board  3  are formed on the top surface of the resin member  2   b . In addition to the opening portion  2   f , multiple opening portions  2   i  penetrating the resin member from the front surface to the rear surface are formed in the resin member  2   b . The opening portions  2   i  are disposed at positions at which the junctions  11  are exposed when the bus bar assembly  10  and the resin member  2   b  are incorporated into a body. That is, the junctions  11  are exposed from the opening portions  2   i . As illustrated in  FIG. 2B , all the junctions  11  exposed from the opening portions  2   i  are cut off, whereby the bus bars  2   a  are separated from each other and are electrically independent. 
     The control board  3  is a printed board including a voltage detecting circuit or the like. The control board  3  is positioned with respect to the bus bar module  2  by fitting the control board to the positioning pins  2   h  of the bus bar module  2  and is fixed to the bus bar module  2  by the screws  4 . 
     The control board  3  has the same substantially rectangular shape as the resin member  2   b  of the bus bar module  2 , as illustrated in  FIG. 2A . The control board  3  includes multiple notches  3   a  in the peripheral portion thereof so as to expose the connection terminals  2   c  of the bus bars  2   a . In this way, in the power supply control device  1  according to this embodiment, since the control board  3  includes the notches  3   a , the connection terminals  2   c  of the bus bar module  2  which are connected to the battery module  101  are exposed when viewed from the control board  3 . 
     The control board  3  includes through-holes  3   b  (see  FIG. 1 ) corresponding to the lead pins  2   d  in areas overlapping with the lead pins  2   d  of the bus bars  2   a . Since the lead pins  2   d  are inserted into the through-holes  3   b  and the lead pins  2   d  are bonded to lands of the control board  3  by soldering, the bus bar module  2  and the control board  3  are electrically connected to each other. 
     Referring to  FIG. 1  again, the cover  110  is disposed on the control board  3  and serves to protect the power supply control apparatus  1 . The cover  110  is fixed to the power supply control apparatus  1 , for example, with not illustrated screws or the like. 
     When the battery system  100  having this configuration is manufactured, first, the battery module  101  and the power supply control apparatus  1  are individually assembled. 
     The battery module  101  is assembled by arranging the multiple batteries  102  in the not illustrated fixed block and fixing the terminal block  103  to the batteries. In the power supply control apparatus  1 , the bus bar module  2  and the control board  3  are fixed by the screws  4  and the lead pins  2   d  are bonded to the control board  3  by reflow type soldering. 
     Subsequently, the power supply control apparatus  1  and the battery module  101  are coupled to each other. Specifically, by inserting not illustrated screws into the through-holes  2   e  formed in the connection terminals  2   c  and screwing the screws to the battery module  101 , the power supply control apparatus  1  and the battery module  101  are coupled to each other. 
     Thereafter, the cover  110  is coupled thereto to assemble the battery system  100 . 
     When the bus bar module  2  is manufactured, the bus bar assembly  10 , which is illustrated in  FIG. 4 , including the bus bars  2   a  connected to each other with the junctions  11  is first formed. The bus bar assembly is formed, for example, by press work such as punching work of punching a metal plate. In the press work, the forming of the bent portions  2   g  or the through-holes  2   e  and the bending of the lead pins  2   d  are performed at the same time. 
     The bus bars  2   a  (bus bars  2   a  arranged on the left side than the opening portion  2   f  in  FIG. 2B ) not included in the bus bar assembly  10  are formed in parallel with the forming of the bus bar assembly  10 . 
     Subsequently, the bus bar assembly  10 , the bus bars  2   a , and the resin member  2   b  are incorporated into a body by insert molding. The opening portions  2   i  for exposing the junctions  11  of the bus bar assembly  10  or the like are formed at the same time by the insert molding. 
     Subsequently, by cutting off the junctions  11  exposed from the opening portions  2   f , the bus bars  2   a  of the bus bar assembly  10  are separated to be electrically independent. 
     In the power supply control apparatus  1  and the manufacturing method of the power supply control apparatus  1  according to this embodiment, the bus bar module  2  can be manufactured by forming the multiple bus bars  2   a  together in a state in which the multiple bus bars are connected to each other with the junctions  11  to form the bus bar assembly  10 , incorporating the bus bar assembly  10  and the resin member  2   b  into a body, and then cutting off the junctions  11 . That is, the bus bar module  2  can be manufactured by insert-molding the bus bar assembly  10  in which the multiple bus bars  2   a  are incorporated into a body. Therefore, it is possible to more easily manufacture the bus bar module in comparison with a case where the individual bus bars are insert-molded to manufacture the bus bar module. As a result, in the power supply control apparatus  1  and the manufacturing method of the power supply control apparatus  1  according to this embodiment, since the manufacturing of the bus bar module  2  can be facilitated, it is possible to easily manufacture the power supply control apparatus  1 . 
     Additionally, in the power supply control apparatus  1  and the manufacturing method of the power supply control apparatus  1  according to this embodiment, the bus bar assembly  10  can be formed using one mold. Accordingly, it is not necessary to prepare a mold for each shape of the bus bars  2   a  and it is thus possible to reduce the manufacturing cost of the bus bar module  2 . As a result, in the power supply control apparatus  1  and the manufacturing method of the power supply control apparatus  1  according to this embodiment, since the manufacturing cost of the bus bar module  2  is reduced, it is possible to reduce the manufacturing cost of the power supply control apparatus  1 . 
     In the power supply control apparatus  1  according to this embodiment, the resin member  2   b  includes the opening portions  2   f  and  2   i  penetrating the resin member from the front surface as one surface to the rear surface as the other surface. Accordingly, in comparison with a case where the opening portions  2   f  and  2   i  are not formed, the amount of resin is reduced and it is thus possible to prevent deformation due to sink marks and to decrease the weight. 
     In the power supply control apparatus  1  according to this embodiment, the junctions  11  are exposed from the opening portions  2   i . Accordingly, it is possible to easily cut off the junctions  11  in the opening portions  2   i  after incorporating the bus bar assembly  10  and the resin member  2   b  into a body. 
     While the exemplary embodiment of the present invention is described above with reference to the accompanying drawings, the present invention is not limited to the exemplary embodiment. All the shapes or combinations of the elements described in the above-mentioned embodiment are only examples and can be modified in various forms depending on design requirements without departing from the gist of the present invention. 
     For example, the arrangement positions of the junctions  11  in the above-mentioned embodiment are only an example and can be changed. In order to enhance the strength of the bus bar assembly  10  to improve the handling properties, it is preferable that the junctions  11  be distributed all over the bus bar assembly  10 . For example, when the bus bar assembly  10  is divided into two areas, i.e., the lead pins  2   d  side and the opposite side, the same number of junctions  11  may be disposed in both areas. By distributing the junctions  11  in this way, the opening portions  2   i  of the resin member  2   b  are also distributed as a result. Accordingly, it is possible to suppress the sink marks of the resin member  2   b  as a whole. 
     The opening portions  2   i  are formed in a track shape in this embodiment. However, the present invention is not limited to this configuration, and another shape such as a rectangular shape may be employed. A configuration in which notches are formed in the peripheral portion of the resin member  2   b  instead of the opening portions  2   i  and the junctions  11  are exposed from the notches may be employed. 
     REFERENCE SIGNS LIST 
     
         
         
           
               1 : power supply control apparatus 
               2 : bus bar module 
               2   a : bus bar 
               2   b : resin member 
               2   c : connection terminal 
               2   d : lead pin 
               2   e : through-hole 
               2   f : opening portion 
               2   g : bent portion 
               2   h : positioning pin 
               2   i : opening portion 
               3 : control board 
               3   a : notch 
               3   b : through-hole 
               4 : screw 
               10 : bus bar assembly 
               11 : junction 
               100 : battery system 
               101 : battery module 
               102 : battery 
               103 : terminal block