Abstract:
A rack housing assembly, including a rack housing that defines a plurality of accommodation spaces opened at a front side to accommodate a plurality of battery trays; and a rack shelf that is in an inner space of the rack housing to house a battery tray and divides the plurality of accommodation spaces, the rack shelf being so dimensioned and positioned in the inner space of the rack housing as to block any mislocated bus member that serially connects each of the plurality of battery trays stacked in the rack housing to each other.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    Korean Patent Application No. 10-2014-0110955, filed on Aug. 25, 2014, in the Korean Intellectual Property Office, and entitled: “Rack Housing Assembly and Energy Storage Apparatus Having the Same,” is incorporated by reference herein in its entirety. 
       BACKGROUND 
       [0002]    1. Field 
         [0003]    One or more embodiments relate to a rack housing assembly and an energy storage apparatus having the rack housing assembly. 
         [0004]    2. Description of the Related Art 
         [0005]    Environmental degradation including resource depletion has led to increased attention in a system capable of storing power and utilizing the stored power efficiently. Additionally, renewable energy may generate energy without causing environmental pollution. An energy storage apparatus may interlink renewable energy, a battery that stores power, and existing power grid systems, and efficiency of the use of energy may be improved. An energy storage apparatus may be used as an uninterruptible power supply to provide emergency power or may provide power, for example, for industrial equipment, in the case of an interruption of a main power source. 
       SUMMARY 
       [0006]    Embodiments may be realized by providing a rack housing assembly, including a rack housing that defines a plurality of accommodation spaces opened at a front side to accommodate a plurality of battery trays; and a rack shelf that is in an inner space of the rack housing to house a battery tray and divides the plurality of accommodation spaces, the rack shelf being so dimensioned and positioned in the inner space of the rack housing as to block any mislocated bus member that serially connects each of the plurality of battery trays stacked in the rack housing to each other. 
         [0007]    The rack housing may include a plurality of rack shelves, the plurality of rack shelves including a first rack shelf; and a second rack shelf that overlaps with the first rack shelf. 
         [0008]    The first rack shelf and the second rack shelf may be in the rack housing, a first end of the first rack shelf may protrude in comparison with a corresponding first end of the second rack shelf, and a second end of the second rack shelf may protrude in comparison with a corresponding second end of the first rack shelf. 
         [0009]    A bus member may be at the second end of the first rack shelf or at the first of the second rack shelf. 
         [0010]    The first rack shelf and the second rack shelf may be alternately disposed in the rack housing in a length direction of the rack housing. 
         [0011]    At least one selected from a first end of the first rack shelf and a second end of the second rack shelf may be aligned with an end of a power terminal of each of the plurality of battery trays. 
         [0012]    The rack shelf may be asymmetrical around a center of each of the plurality of battery trays. 
         [0013]    A length of the rack shelf may be shorter than a distance between two power terminals of each of the plurality of battery trays. 
         [0014]    Embodiments may be realized by providing an energy storage apparatus, including a plurality of battery trays including power terminals at opposite sides thereof; a rack housing that define a plurality of accommodation spaces opened at a front side to accommodate the plurality of battery trays; a rack shelf that is in the rack housing and sections the plurality of the accommodation spaces to house the plurality of battery trays; and a bus member that connects power terminals of two adjacent battery trays among the plurality of battery trays, a first distance from a center of a battery tray to a first end of the rack shelf being smaller than a second distance from the center of the battery tray to a second end of the rack shelf. 
         [0015]    The energy storage apparatus may include a plurality of bus members that connect the two adjacent battery trays, the plurality of bus members including a first bus member that is at the second end of each of the plurality of battery trays and electrically connects the plurality of battery trays to each other; and a second bus member that is opposite to the first bus member with respect to the center of the plurality of battery trays, and connects to the first end of each of the plurality of battery trays. 
         [0016]    The first bus member and the second bus member may serially connect the plurality of battery trays. 
         [0017]    The energy storage apparatus may include a plurality of rack shelves, the plurality of rack shelves including a first rack shelf; and a second rack shelf that overlaps with the first rack shelf. 
         [0018]    The first rack shelf and the second rack shelf may be in the rack housing, a first end of the first rack shelf may protrude in comparison with a corresponding first end of the second rack shelf, and a second end of the second rack shelf may protrude in comparison with a corresponding second end of the first rack shelf. 
         [0019]    The bus member may be at the second end of the first rack shelf or at the first end of the second rack shelf. 
         [0020]    The first rack shelf and the second rack shelf may be alternately disposed in the rack housing in a length direction of the rack housing. 
         [0021]    The first distance may be the same as a distance from the center of the battery trays to each end of the power terminals of the battery tray. 
         [0022]    The energy storage apparatus may further include a current blocking device on the bus member. 
         [0023]    The bus member may be at the second end of the rack shelf. 
         [0024]    The rack shelf may prevent a short of the bus member. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0025]    Features will become apparent to those of skill in the art by describing in detail exemplary embodiments with reference to the attached drawings in which: 
           [0026]      FIG. 1  illustrates a perspective view of an energy storage apparatus according to an embodiment; 
           [0027]      FIG. 2  illustrates a cutaway view of the energy storage apparatus illustrated in  FIG. 1 ; 
           [0028]      FIG. 3  illustrates a front view of a battery tray and a rack shelf, which are illustrated in  FIG. 1 ; and 
           [0029]      FIG. 4  illustrates a magnified front view of an area A illustrated in  FIG. 3 . 
       
    
    
     DETAILED DESCRIPTION 
       [0030]    Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings; however, they may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey exemplary implementations to those skilled in the art. 
         [0031]    As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Expressions such as “at least one of” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list. 
         [0032]    As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising” used herein specify the presence of stated features or components, but do not preclude the presence or addition of one or more other features or components. 
         [0033]    It will be understood that although the terms “first”, “second”, etc. may be used herein to describe various components, these components should not be limited by these terms. These components are only used to distinguish one component from another. 
         [0034]      FIG. 1  illustrates a perspective view of an energy storage apparatus  10  according to an embodiment.  FIG. 2  illustrates a cutaway view of the energy storage apparatus  10  illustrated in  FIG. 1 .  FIG. 3  illustrates a front view of some parts of the energy storage apparatus  10  illustrated in  FIG. 1 .  FIG. 4  illustrates a magnified front view of an area A illustrated in  FIG. 3 . 
         [0035]    Referring to  FIGS. 1 to 4 , the energy storage apparatus  10  may include a rack housing assembly  100  and a plurality of battery trays  200  housed in the rack housing assembly  100 . 
         [0036]    The energy storage apparatus  10  may include bus members  300  that connect the plurality of battery trays  200 . The energy storage apparatus  10  may also include current blocking device  400  mounted on the bus members  300 . 
         [0037]    The battery tray  200  is a module of a plurality of unit battery packs (not shown) that are packed as a unit, and the energy storage apparatus  10  may be formed by connecting a plurality of battery trays  200  serially and/or in parallel. For example, the battery tray  200  may include a plurality of unit battery packs (not shown) formed in a flat shape and stacked in a horizontal direction Z2. The battery tray  200  may include a power terminal (not labeled) for outputting a discharge current to an external load (not shown) or inputting a charge current from an external power supply apparatus (not shown). 
         [0038]    The plurality of battery trays  200  may be provided. The plurality of battery trays  200  may be stacked inside a rack housing  110 . For example, the plurality of battery trays  200  may include a first battery tray  210  disposed in an upper portion of the rack housing  110 , and a second battery tray  220  disposed under the first battery tray  210 . 
         [0039]    The first battery tray  210  and the second battery tray  220  may be formed to be the same as or similar to each other. The first battery tray  210  and the second battery tray  220  may be stacked alternately. For example, a second battery tray  220  may be disposed on a lower surface of a first battery tray  210 , and another first battery tray  210  may be disposed on a lower surface of the second battery tray  220 . Another second battery tray  220  may be disposed on a lower surface of the other first battery tray  210 . 
         [0040]    The first battery tray  210  and the second battery tray  220  may be formed to be the same as or similar to each other. Hereinafter, for the sake of convenience, the first battery tray  210  will be mainly explained in detail. 
         [0041]    The first battery tray  210  may include a first tray housing  211  having an internal space. The first tray housing  211  may be formed of a plurality of plates. For example, the plurality of plates may be integrally formed; be coupled by, for example, screws bolts; or be coupled by, for example, welding. 
         [0042]    A first unit battery pack  212  may be inserted into the first tray housing  211 . The first unit battery pack  212  may be any of various types of batteries including a primary battery and a secondary battery. For the sake of convenience, a case where the first unit battery pack  212  is a secondary battery will now be described in detail. 
         [0043]    A plurality of the first unit battery packs  212  may be inserted into the first tray housing  211  and may be connected to each other serially or in parallel by a first busbar (not shown). A plurality of the first busbars may be provided. The first busbars disposed at the both ends of the first tray housing  211  may perform as a first power terminal (not labeled) of the first battery tray  210 . 
         [0044]    The first power terminal may include a first positive electrode terminal  213  disposed to project from a first end of the first tray housing  211 , and a first negative electrode terminal  214  disposed to project from a second end of the first tray housing  211 . 
         [0045]    The rack housing assembly  100  may include the rack housing  110  and a rack shelf  120 . The rack housing  110  may include a support frame  111  having an inner space and supporting the rack housing  110  against an external force. The rack housing  110  may also include a cover frame  112  and a bottom frame  113  respectively forming a top and a bottom of the rack housing  110  and extending in a horizontal direction Z3. The rack housing  110  may also include a lateral frame  114  extending between the cover frame  112  and the bottom frame  113  in a vertical direction Z1. 
         [0046]    The frame members  112 , 113  and  114  may form the outer appearance of the rack housing  110 , which may be a substantially cubic shape. For example, the support frame  111  may be formed of the plurality of frames to maintain an inner space within the rack housing  110  and may be designed to protect the rack housing  110  from, for example, an external shock. 
         [0047]    The cover frame  112  and the bottom frame  113  extend in the horizontal direction Z3 at the top and bottom of the rack housing  110 , respectively, and the lateral frame  114  may extend in the vertical direction Z1 between the cover frame  112  and the bottom frame  113  to connect the cover frame  112  and the bottom frame  113 . The lateral frame  114  may extend in the vertical direction Z1 across the side surfaces of accommodation spaces G in which the plurality of battery trays  200  are accommodated, and define a column of the accommodation spaces G along the vertical direction Z1. The lateral frame  114  may be provided in the vertical direction Z1 between two neighboring columns of the accommodation spaces G, and the two columns of accommodation spaces G in the vertical direction Z1 may be separated. In an embodiment, the accommodation spaces G may be formed in a single column. Hereinafter, for the sake of convenience, the case where the accommodation space G is a single column will be described in detail. 
         [0048]    The cover frame  112 , the bottom frame  113 , and the lateral frame  114  may be formed as separate members and then coupled to the support frame  111  to form a frame of the rack housing  110 . The cover frame  112 , the bottom frame  113 , the lateral frame  114 , and the support frame  111  may be coupled to each other by using a permanent coupling method such as welding or may be detachably coupled by using a mechanical coupling method such as screw coupling. 
         [0049]    In an embodiment, the frame of the rack housing  110  may be integrally formed. The cover frame  112 , the bottom frame  113 , and the lateral frame  114  may be formed by perpendicularly bending a plate having a substantially plate shape several times. The frame of the rack housing  110  may be formed by finally coupling the plate to the support frame  111 . 
         [0050]    Each of the cover frame  112  and the bottom frame  113  may have a substantially rectangular shape with a pair of long sides and a pair of short sides. The cover frame  112  and the bottom frame  113  may form the top and the bottom of the rack housing  110 , respectively. 
         [0051]    The bottom frame  113  may protect the battery trays  200  housed in the rack housing  110  from external shock, perform a function of a stand for transfer equipment to facilitate a transfer, and include a fork insertion portion (not shown) into which a fork of transfer equipment is inserted. The fork insertion portion may be formed in the lower portion of the bottom frame  11 . The whole or part of the bottom frame  113  may be formed of a non-metal based material for a vibration resistant design. The bottom frame  113  may include a plurality of leg members  113   a  to support the rack housing  110  in an upright posture. The leg members  113   a  may form a part of the bottom frame  113 . For example, the leg members  113   a  may support the rack housing  110  against a bottom surface (not shown) and be formed in various shapes as long as the leg members  113   a  contact the bottom surface. 
         [0052]    Although not shown in the drawings, a circuit configuration such as a battery management system (BMS) for generally controlling the plurality of battery trays  200  housed in the rack housing  110  may be provided in the upper portion of the cover frame  112 . 
         [0053]    A plurality of the rack shelves  120  may be arranged at regular intervals in the vertical direction Z1 of the rack housing  110  to provide the accommodation spaces G to the battery trays  200 . The rack shelves  120  may be coupled to an inner wall of the rack housing  110 , for example, to an inner wall of the lateral frame  114  or to the support frame  111 , and may be fixed to the inside of the rack housing  110  by using a mechanical method such as screw coupling. For example, flange portions may be provided at both sides of each of the rack shelves  120 , and the rack shelves  120  may be fixed to the rack housing  110  by coupling members such as, for example, screws or nuts, that penetrate through the flange portions and are then inserted into the lateral frame  114 . The rack shelves  120  uphold and support the battery trays  200  and may be disposed between the battery trays  200  arranged in the vertical direction Z1, and the accommodation spaces G may be partitioned. 
         [0054]    As shown in the drawings, the front side of the accommodation spaces G may form an opening that is open to the outside. The battery trays  200  inserted through the opening may be guided by the frame members  112 ,  113 , and  114 , and the rack shelves  120  dividing the accommodation spaces G, and may be accommodated on the rack shelves  120  while sliding on the rack shelves  120 . The rack housing  110  may have the opening formed at the front side thereof to allow the battery trays  200  to be inserted therethrough, and a back circuit board (not shown) at the rear side thereof to be electrically connected to the battery trays  200 . The battery trays  200  inserted via the front side of the rack housing  110  may slide and reach the back circuit board provided at the rear side of the accommodation spaces G. The battery trays  200  may be electrically coupled to the back circuit board at the position of the back circuit board, and coupling positions may be defined. 
         [0055]    Although not shown in the drawings, a restriction unit, for example, a restriction bar (not shown), may be provided at the opening formed at the front side of the rack housing  110 , and the battery trays  200  may be prevented from being removed or escaping. 
         [0056]    A group of the battery trays  200  may be arranged in at least one column in the vertical direction Z1 in the rack housing  110 . 
         [0057]    An air-cooling type heat dissipation structure may be applied to the rack housing  110  in order to achieve heat dissipation of the battery trays  200 . As shown in  FIG. 1 , a first vent hole (not labeled) may be formed on one side of each of the battery trays  200 , for example, an upper surface thereof, to introduce external air at low temperature into the rack housing  110 , and a cooling fan (not shown) may be provided inside or outside the first vent hole. As the cooling fan forcibly introduces external air at low temperature into each of the battery trays  200 , external air at low temperature introduced by the cooling fan may turn into air at high temperature by heat transfer while flowing through the inside of the rack housing  110 , and then may be exhausted to the outside along the air flow. 
         [0058]    In an embodiment, the cooling fan may be provided at the front surface of each of the battery trays  200 , and the air flow by the cooling fan may be directed to the inside of each of the battery trays  200  through the opening of the rack housing  110  and the first vent hole of each of the battery trays  200 . First vent holes may be respectively formed at front and rear surfaces of each of the battery trays  200  to facilitate the forced air flows in the forward and backward direction. The aforementioned examples provide exemplary positions of the cooling fan. 
         [0059]    The front side of the rack housing  110  may formed as an opening, and external air at low temperature may be smoothly introduced into the rack housing  110  without flow resistance. The back circuit board may be provided at the rear surface of the rack housing  110 , and may be electrically connected to the battery trays  200 . The back circuit board and rack housing  110  form a predetermined opening space (not shown) at the rear surface of the rack housing  110  to exhaust air smoothly. The back circuit board may partially form the predetermined opening space without completely closing the rear surface of the rack housing  110 , and the predetermined opening space may be formed between the back circuit board and each of the rack shelves  120 . 
         [0060]    A plurality of second vent holes (not shown) may be formed on each of the rack shelves  120  supporting the battery trays  200 . The heat accumulated inside the rack housing  110  may flow upward due to buoyancy. At this time, the heat may flow via the second vent holes of each of the rack shelves  120  and may be exhausted to the outside through the first vent hole of each of the battery trays  200 . 
         [0061]    The rack shelves  120  may partition the inner space of the rack housing  110 . The plurality of the rack shelves  120  may be provided and arranged to be spaced apart from each other in the vertical direction Z1, as described above. 
         [0062]    Each rack shelf  120  may be formed asymmetrically around, e.g., about, a center C. For example, a first distance S1, that is the distance from the center C to one end of the rack shelf  120 , may be formed shorter than a second distance S2 that denotes the distance from the center C to a second end of the rack shelf  120 . 
         [0063]    The first distance S1 may be the same as a distance S4 that is the distance from the center C of each battery tray  200  to the end of the power terminal of the battery tray  200 . For example, the first distance S1 may be the same as the distance S4 from the center C of the battery tray  200  to a positive electrode terminal  214  or  224  or a negative electrode terminal  213  or  223 . 
         [0064]    On the other side, the second distance S2 may be formed shorter than the distance S4 that is the distance from the center C of the battery tray  200  to the end of the power terminal of the battery tray  200 . 
         [0065]    The length of the rack shelf  120  may be formed shorter than a distance between the end of the positive electrode terminal  214  or  224  and the end of the negative electrode terminal  213  or  223 . 
         [0066]    The rack shelves  120  may include first rack shelves  121  and second rack shelves  122 . The first rack shelves  121  and the second rack shelves  122  may be stacked alternately in the rack housing  110 . Each first rack shelf  121  and each second rack shelf  122  may be arranged to be spaced apart from each other in the vertical direction Z1 (for example, the length direction of the rack housing  110 ). For example, a first rack shelf  121  may be disposed at the higher position than the second rack shelf  122 , and another first rack shelf  121  may be disposed under the second rack shelf  122 . Another second rack shelf  122  may be disposed under the other first rack shelf  121 . The first rack shelves  121  and the second rack shelves  122  may be arranged in the rack housing  110  to repeatedly form the above position. 
         [0067]    The first rack shelf  121  and the second rack shelf  122  may be disposed to partially overlap with each other. For example, the first rack shelf  121  and the second rack shelf  122  may overlap with each other. The first rack shelf  121  and the second rack shelf  122  may be disposed such that a first end P 1  of the first rack shelf  121  further protrudes in comparison with the a corresponding first end P 2  of the second rack shelf  122 . The first rack shelf  121  and the second rack shelf  122  may be disposed in the rack housing  110  such that a second end P 4  of the second rack shelf  122  further protrudes in comparison with a corresponding second end P 3  of the first rack shelf  121 . 
         [0068]    The bus members  300  may serially connect the stacked battery trays  200 , and the plurality of bus members  300  may be provided. For example, the plurality of bus members  300  may be disposed at a first end of the stacked battery trays  200 , and the plurality of bus members  300  may include first bus members  310  that electrically connect the stacked battery trays  200  to each other. The plurality of bus members  300  may include second bus members  320  disposed on a side of battery trays  200  opposite to the first bus members  310  and connected to a second end of the stacked battery trays  200 . 
         [0069]    Each first bus member  310  may connect a first positive electrode terminal  213  of a first battery tray  210  to a second negative electrode terminal  224  of a second battery tray  220 , and each second bus member  320  may connect a second positive electrode terminal  223  of the second battery tray  220  to a first negative electrode terminal  214  of a first battery tray  210  disposed under the second battery tray  220 . The first bus members  310  and the second bus members  320  may alternate with each other, and the battery trays  200  that are stacked may be serially connected. 
         [0070]    A current blocking device  400  may be provided on at least one selected from the plurality of bus members  300 . If excess current is supplied to the bus member  300 , the current blocking device  400  may disconnect the bus member  300  to prevent the energy storage apparatus  10  from malfunctioning or being damaged. 
         [0071]    In the process of installing or manufacturing the energy storage apparatus  10  as described above, the first bus members  310  and the second bus members  320  may be arranged in the same line. When the first bus members  310  and the second bus members  320  directly contact each other, or when the first bus members  310  and the second bus members  320  contact each other via, for example, a foreign material, excess current may be supplied thereto and then a short may occur, leading to, for example, a fire. In an embodiment, the first bus members  310  and the second bus members  320  may be disposed at different positions to help prevent, for example, excess current being supplied thereto. 
         [0072]    First bus members  310  and second bus members  320  may be disposed to face each other with battery trays  200  interposed therebetween. For example, if the first bus member  310  is disposed at a first end of the battery tray  200 , the second bus member  320  may be disposed at a second end of the battery tray  200 . In an embodiment, the first bus member  310  may be disposed at a second end of the battery tray  200 , and the second bus member  320  may be disposed at a first end of the battery tray  200 . Hereinafter, for the sake of convenience, the case where the first bus member  310  is disposed at a second end of the battery tray  200 , and the second bus member  320  is disposed at a first end of the battery tray  200  will be explained in detail. 
         [0073]    The first bus member  310  may be disposed at the opening that is the front surface of the rack housing  110 , and the second bus member  320  may be disposed at the rear surface of the rack housing  110 . 
         [0074]    The first bus member  310  and the second bus member  320  may be disposed at different heights. For example, the first bus member  310  may be disposed at a higher position than a position of the second bus member  320 . 
         [0075]    In the process of installing or assembling the energy storage apparatus  10  as described above, at least one selected from each first rack shelf  121  and each second rack shelf  122  may determine the exact positions of the first bus member  310  and the second bus member  320 . 
         [0076]    For example, if the energy storage apparatus  10  is provided outside, the rack housing assembly  100  may be fixed to, for example, an external structure or the ground surface. Then, the battery trays  200  may be inserted into the rack housing  110 . Each of the battery trays  200  may be inserted into each of the rack shelves  120 . 
         [0077]    A first battery tray  210  may be disposed on a first rack shelf  121 , and a second battery tray  220  disposed under the first battery tray  210  may be disposed on a second rack shelf  122 . Another first battery tray  210  disposed under the second battery tray  220  may be disposed on another first rack shelf  121  arranged under the second rack shelf  122 , and the first battery trays  210  and the second battery trays  220  may alternate with each other. 
         [0078]    After disposing the first battery trays  210  and the second battery trays  220  in the above-described manner, the first bus members  310  and the second bus members  320  may be disposed thereon. The first bus member  310 , as described above, may be disposed at a second side of first battery tray  210 . The second bus member  320  may be disposed at a first side of the second battery tray  220 . 
         [0079]    If the first bus member  310  and the second bus member  320  are disposed in the above-described manner, each of the first bus member  310  and the second bus member  320  does not overlap with each of the first rack shelf  121  and the second rack shelf  122 , respectively, and may be easily disposed. 
         [0080]    If an attempt were made to dispose the first bus member  310  by connecting a first side of the first rack shelf  121  and a first side of the second rack shelf  122 , or to dispose the second bus member  320  by connecting a second side of the first rack shelf  121  and a second side of the second rack shelf  122 , the first bus member  310  or the second bus member  320  would be blocked by the first rack shelf  121  or the second rack shelf  122 , respectively, and it therefore may not be possible to properly position the bus member. 
         [0081]    If the first bus member  310  is disposed at a first side of the first rack shelf  121 , the first bus member  310  may be connected to the first negative electrode terminal  214  and a second positive electrode terminal  223  of the second battery tray  220 . The first bus member  310  may be disposed inward of a straight line that connects an end of the first negative electrode terminal  214  and an end of the second positive electrode terminal  223 . The first distance S1 of the first rack shelf  121  may be the same as the distance from the center C of the first battery tray  210  to the end of the first negative electrode terminal  214 , the position of the first bus member  310  may be determined within the second distance S2, and the physical arrangement of the first bus member  310  may not be possible unless the shape of the first bus member  310  is changed. 
         [0082]    In the rack housing assembly  100  and the energy storage apparatus  10 , when the stacked battery trays  200  are connected to each other, a short that may occur when the bus members are arranged in a single straight line may be prevented. 
         [0083]    In the rack housing assembly  100  and the energy storage apparatus  10 , when the bus member  300  is mislocated during assembly, an assembler may notice the mislocation of the bus member  300  and may prevent an incorrect assembly. 
         [0084]    As described above, according to the one or more of the above embodiments, a short may be prevented. 
         [0085]    Example embodiments have been disclosed herein, and although specific terms are employed, they are used and are to be interpreted in a generic and descriptive sense only and not for purpose of limitation. In some instances, as would be apparent to one of skill in the art as of the filing of the present application, features, characteristics, and/or elements described in connection with a particular embodiment may be used singly or in combination with features, characteristics, and/or elements described in connection with other embodiments unless otherwise specifically indicated. Accordingly, it will be understood by those of skill in the art that various changes in form and details may be made without departing from the spirit and scope of the present invention as set forth in the following claims.