Abstract:
The present disclosure is directed towards a high voltage interface cover system for inhibiting liquid contamination of high voltage connection areas of EV&#39;s and HEV&#39;s. This liquid contamination may come from atmospheric precipitation or road splash which comes in contact with the surface of either the HVDC connection block cover and/or the high voltage main device cover, and flows into the interface seals connecting them. The cover system comprises a pair of interlocking covers which provide a tortuous path for liquid contamination to penetrate the interface.

Description:
This present disclosure relates to the field of electric vehicles (EV) or electric-hybrid vehicles (EHV). More specifically, this present disclosure relates to the High Voltage Direct Current (HVDC) connection system for an EV or EHV, particularly the High Voltage Interlock (HVIL) interface. 
     BACKGROUND 
     This section provides background information related to the present disclosure which is not necessarily prior art. 
     In HEV structures and EV structures, a breaker device and a high-voltage unit are placed in a space isolated from the occupant compartment and luggage compartment of the vehicle and the space is closed by covering it with a lid for maintenance. For maintenance and inspection of a high voltage device, an appropriate safety measure or measures must be taken to ensure that a person who performs maintenance and inspection of the HV device is sufficiently protected from high voltage. The interlock mechanism interrupts, for protection from high voltage, a corresponding circuit when a protection cover is detached. This concept is applicable towards any high voltage power electronic main device found in EV&#39;s and HEV&#39;s (such as a traction inverter, DCDC converter, onboard charge module, etc.) 
     Current designs generally have two configurations: (A) utilize the HVDC connection block cover independent from other covers on a high voltage power electronic device, or (B) utilize the HVDC cover and integrated HVIL to prevent secondary covers from being removed while device is under power. 
     The longstanding issue with both these designs is the allowance of a gap between the HVDC cover and the main device cover, which can allow fluid/contaminants to penetrate the HVDC interface. Contamination in this area may result in a high voltage short circuit, shock risk to persons, and even a vehicle thermal event. 
     SUMMARY 
     This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features. 
     In light of the shortcomings in the prior art, the present disclosure is directed towards preventing liquid contamination of high voltage connection areas of EV&#39;s and HEV&#39;s. This liquid contamination may come from atmospheric precipitation or road splash which comes in contact with the surface of either the HVDC connection block cover and/or the high voltage main device cover, and flows into the interface seals connecting them. 
     In order to achieve this result, a new HV connection cover system design is disclosed. The particular cover system significantly inhibits liquid contamination from flowing into the electric interface seals connecting the HVDC connection block and the HV main device. 
     Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure. 
    
    
     
       DRAWINGS 
       The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure. 
         FIG. 1A  is a partial perspective view of a first prior art HV cover system; 
         FIG. 1B  is a partial side view of the prior art HV cover system of  FIG. 1A ; 
         FIG. 2A  is a partial perspective view of a second prior art HV cover system; 
         FIG. 2B  is a partial side view of the prior art HV cover system of  FIG. 2A ; 
         FIG. 3A  is a perspective disassembled view representing the primary embodiment HV cover system of the present disclosure; 
         FIG. 3B  is a perspective assembled view of the primary embodiment HV cover system in  FIG. 3A ; 
         FIG. 4A  is a is a partial side view of the HV cover system of  FIG. 3B ; and 
         FIG. 4B  is a partial side view of a secondary embodiment HV cover system. 
     
    
    
     Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings. 
     DETAILED DESCRIPTION 
     Example embodiments will now be described more fully with reference to the accompanying drawings. The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features. 
     Referring to the figures, in particularly  FIGS. 1A-2B , prior art in this field will be described illustrating a high voltage cover system  10 . In typical EV&#39;s and HEV&#39;s a HV connection block  20  is attached to any number of high voltage devices  30 , such as traction inverters, DCDC converters, or onboard charge modules. The connection block  20  through an electrical interface  15 , provides power from the vehicle&#39;s batteries (not shown) to the high voltage device  30 . 
     In order to protect the HV connection block  20  and the associated HV device  30  from moisture and debris, both the connection block  20  and the HV device  30  employ a cover  14 ,  13  respectively. Even though the covers  14 ,  13  fit their respective components securely liquid contamination (LC) such as rain water, moisture, or other precipitation can run down into the joint between the connection block  20  and HV device  30 . Some assurances are usually made in sealing the interface  15  to prevent moisture from entering, it is still a dangerous probability. 
       FIGS. 2A &amp; 2B  illustrate an overlapping interlock cover arrangement in the prior art. In this arrangement cover  14  incorporates a raised wall  16  and a lip  17 , generally parallel to the main cover  14  which partially overlaps the cover  13  for the HV device  30 . This prevents the removal of cover  13  prior to the removal of cover  14 , and provides some added protection against debris entering the interface  15 , there is still the possibility of liquid contamination LC flowing into the interface and causing a shock, failure, or possibly fire. 
     Referring now to  FIGS. 3A  thru  4 A, the preferred embodiment of the present cover system  10  is shown. As described in the prior art, the HV connection block  20  attached to a HV device  30 , and provides an electrical interface there between. HV connector  20  is also provided a cover  21 , which is attached to an upper side of the connection block  20  thru known fastening devices. The cover  21  partially overlaps around the vertical sides of the connection block  20  which provides the power supply from the vehicle&#39;s battery. Likewise, HV device  30  is also provided a cover  32 , which is attached to an upper side of the HV device  30  thru known fastening devices. The cover  32  partially overlaps around the vertical sides of the HV device  30 . 
     The cover  32  further comprises a raised edge  33 , which runs along the side facing the interface junction between the connection block  20  and HV device  30 . This raised edge  33  can be formed in the cover  32  at the time of stamping or forming. 
     Corresponding cover  21  of the connection block  20  is further defined as having an inverted channel comprising wall  22 , transition portion  23 , and downward oriented lip  24  which also runs along the side facing the interface junction between the connection block  20  and the HV device  30 . this channel corresponds with and is designed to receive the raised edge  33  of cover  32 , once installed after cover  32 . This configuration provides a tortuous path through which any moisture or liquid contamination must traverse in order to penetrate the juncture between the connection block  20  and HV device  30  at interface  15 . 
     The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. Such variations are not to be regarded as a departure from the invention, and all such modifications are intended to be included within the scope of the invention. For the purpose of this disclosure, the term fastener can mean any type of fastener known in the art such as pins, screws, bolts or the like comprised of materials such as metals, alloys, polymers, or plastics known in the art. 
     Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail. 
     The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed. 
     When an element or layer is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to,” “directly connected to,” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments. 
     Spatially relative terms, such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature&#39;s relationship to another element(s) or feature(s) as illustrated in the Figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the Figures. For example, if the device in the Figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.