Patent Publication Number: US-10770825-B2

Title: Electrical contact spring and electrical assembly including same

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefit under 35 U.S.C. § 119(e) of U.S. Provisional Patent Application No. 62/749,926 filed on Oct. 24, 2018, the entire disclosure of which is hereby incorporated by reference. 
    
    
     TECHNICAL FIELD OF THE INVENTION 
     The invention generally relates to an electrical contact spring and an electrical assembly including such as contact spring. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
       The present invention will now be described, by way of example with reference to the accompanying drawings, in which: 
         FIG. 1  is a perspective view of an electrical contact spring, according to one embodiment of the invention; 
         FIG. 2  is a top view of the electrical contact spring of  FIG. 1 , according to one embodiment of the invention; 
         FIG. 3  is a cross section top view of the electrical contact spring of  FIG. 1 , according to one embodiment of the invention; 
         FIG. 4  is a side view of an electrical assembly including the electrical contact spring of  FIG. 1 , according to another embodiment of the invention; 
         FIG. 5  is a top view of the electrical assembly of  FIG. 4 , according to one embodiment of the invention; 
         FIG. 6  is a cross section perspective view of the electrical assembly of  FIG. 4 , according to one embodiment of the invention; and 
         FIG. 7  is a partial perspective view of the electrical assembly of  FIG. 4 , according to one embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the various described embodiments. However, it will be apparent to one of ordinary skill in the art that the various described embodiments may be practiced without these specific details. In other instances, well-known methods, procedures, components, circuits, and networks have not been described in detail so as not to unnecessarily obscure aspects of the embodiments. 
     Electrophoretic painting processes, commonly known as e-coating, has become a preferred method for providing corrosion protection for sheet metal parts, such as the metal cases of battery packs or other electronic assemblies. However, the e-coating electrically isolates one metallic part, such as a base plate from another metallic part, such as a cover attached to the base plate. The base plate and the cover are preferably electrically connected to one another so that they can provide electromagnetic shielding for the electronic devices within. The electrical contact spring presented herein is configured to penetrate the e-coating so that the electrical contact spring is in electrical contact with the metal beneath the e-coating in order to provide proper electromagnetic shielding. 
       FIGS. 1 through 7  illustrate an embodiment of an electrical assembly, hereinafter referred to as the assembly  10  including an electrical contact spring, hereinafter referred to as the contact spring  12 , that is connected to a planar first member  14  that is formed of a first electrically conductive material, e.g. a metal base plate of a battery pack and provide an electrical connection to a second member  16  that is distinct from the first member  14  and formed of a second electrically conductive material, e.g. a metal cover of a battery pack. The first and second conducive materials may be a metallic material, such as an aluminum alloy, or may be a conductive plastic. The first and second conductive materials may be the same material or they may be different materials. 
     As shown in  FIG. 1 , the assembly  10  includes a contact spring  12  that is formed of a third electrically conductive material. The contact spring  12  is disposed within a T-shaped aperture  18  extending through the first member  14 . As best shown in  FIG. 5 , the contact spring  12  is in physical and electrical contact with the first and second members  14 ,  16 . The contact spring  12  has a planar base portion  20 , an arcuate portion  22  extending from the base portion  20  in contact with the second member  16 , and two winged portions  24  extending from distal edges  26  of the base portion  20  that flank the base portion  20 . 
     As illustrated in  FIGS. 2 and 3 , each of the two winged portions  24  are in contact with an inner surface  28  of the aperture  18 . As shown in  FIG. 4 , the arcuate portion  22  of the contact spring  12  is in contact with a conductive inner surface  30  of the second member  16 . 
       FIG. 1  also shows that the assembly  10  further includes a support member  32  that protrudes through the aperture  18  with the contact spring  12 . The support member  32  may be part of a plastic header. The support member  32  has a planar segment  34  that is in physical contact with the base portion  20  of the contact spring  12 . The base portion  20  of the contact spring  12  and the planar segment  34  of the support member  32  is generally perpendicular to the planar first member  14 . As shown in  FIG. 6 , the contact spring  12  defines an elongate tail  36  that is disposed within the support member  32 . 
     The first member  14  is coated with an electrically nonconductive material  38 , such as a paint applied using an e-coating processes. The two winged portions  24  scratch through the electrically nonconductive material  38  down to the first electrically conductive material as the contact spring  12  is inserted within the aperture  18  and provide a compressive normal force against the first member  14 , thereby providing electrical contact between the first electrically conductive material of the first member  14  and the contact spring  12 . Testing by the inventors has shown that reliably scraping through the e-coating preferably requires a wiping, linear motion rather than a compressive motion. The contact points between the two winged portions  24  and the first member  14  are in the thickness of the first member  14  rather than the flat top or bottom surface of the first member  14 . The contact spring  12  eliminates the need for masking a portion of the first member  14  during the e-coating process to provide a conductive surface. 
     As shown in  FIG. 7 , a number of contact springs  12  can be placed around the header since they are loose piece components and do not need to be mechanically connected to each other. 
     While this invention has been described in terms of the preferred embodiments thereof, it is not intended to be so limited, but rather only to the extent set forth in the claims that follow. For example, the above-described embodiments (and/or aspects thereof) may be used in combination with each other. In addition, many modifications may be made to configure a particular situation or material to the teachings of the invention without departing from its scope. Dimensions, types of materials, orientations of the various components, and the number and positions of the various components described herein are intended to define parameters of certain embodiments, and are by no means limiting and are merely prototypical embodiments. 
     Many other embodiments and modifications within the spirit and scope of the claims will be apparent to those of skill in the art upon reviewing the above description. The scope of the invention should, therefore, be determined with reference to the following claims, along with the full scope of equivalents to which such claims are entitled. 
     As used herein, ‘one or more’ includes a function being performed by one element, a function being performed by more than one element, e.g., in a distributed fashion, several functions being performed by one element, several functions being performed by several elements, or any combination of the above. 
     It will also be understood that, although the terms first, second, etc. are, in some instances, used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first contact could be termed a second contact, and, similarly, a second contact could be termed a first contact, without departing from the scope of the various described embodiments. The first contact and the second contact are both contacts, but they are not the same contact. 
     The terminology used in the description of the various described embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various described embodiments and the appended claims, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term “and/or” as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. It will be further understood that the terms “includes,” “including,” “comprises,” and/or “comprising,” when used in this specification, 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. 
     As used herein, the term “if” is, optionally, construed to mean “when” or “upon” or “in response to determining” or “in response to detecting,” depending on the context. Similarly, the phrase “if it is determined” or “if [a stated condition or event] is detected” is, optionally, construed to mean “upon determining” or “in response to determining” or “upon detecting [the stated condition or event]” or “in response to detecting [the stated condition or event],” depending on the context. 
     Additionally, while terms of ordinance or orientation may be used herein these elements should not be limited by these terms. All terms of ordinance or orientation, unless stated otherwise, are used for purposes distinguishing one element from another, and do not denote any particular order, order of operations, direction or orientation unless stated otherwise.