Abstract:
The invention discloses a terminal position assurance member, including a base plate having an upper surface and a lower surface and extending from the upper surface to the lower surface; a trough hole being provided at a middle portion of the base plate, and the through hole extending from the upper surface to the lower surface; at least one first insertion  5  member extending from the upper surface of the base plate and protruding out of the base plate a selected height, the first insertion member having a lateral surface along its extension direction; and a second insertion member extending from the upper surface of the base plate and protruding out of the upper surface; the first insertion member is provided with at least two protrusions which extend from the lateral surface of the first insertion member and  10  protrude out of the lateral surface of the first insertion member; said at least two protrusions are arranged to be spaced from one another along the height direction of the first insertion member. The invention can enable the terminal position assurance member to be pre-mounted and then completely mounted in place in use.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to a terminal position assurance member, a terminal assembly, a connector housing assembly and a connector. 
       BACKGROUND OF THE INVENTION 
       [0002]    A high-voltage electricity connector is a commonly-used adapter in electrical power transmission which is used to connect two cables or connect a cable with an electricity consumption equipment. It is configured as an insertion structure for purpose of easy use or organization. However, the insertion structure is liable to be loosed or disengaged during frequent use, and thereby it is desirable to use a terminal position assurance (TPA) member to secure the insertion structure. However, for the terminal position assurance member in the prior art, it must be mounted in place on a connector by using a special tool, and the mounting procedure is complicated. Furthermore, during mounting, it can only be mounted in place in one-step, not in multiple steps. Housings and the terminal position assurance members can only be separately stored so that storage and transport thereof are inconvenient. 
       SUMMARY OF THE INVENTION 
       [0003]    One of the objects of the present invention is to provide a terminal position assurance member which can be conveniently mounted and stably retained at a desired position, to overcome the drawbacks in the prior art. 
         [0004]    To achieve the above object, the present invention employs the following technical solution. 
         [0005]    A terminal position assurance member, characterized in that it comprises:
       a base plate having an upper surface and a lower surface and extending from the upper surface to the lower surface; a trough hole being provided at a middle portion of the base plate, and the through hole extending from the upper surface to the lower surface;   at least one first insertion member extending from the upper surface of the base plate and protruding out of the base plate a selected height, the first insertion member having a lateral surface along its extension direction; and   a second insertion member extending from the upper surface of the base plate and protruding out of the upper surface;   the first insertion member is provided with at least two protrusions which extend from the lateral surface of the first insertion member and protrude out of the lateral surface of the first insertion member;   said at least two protrusions are arranged to be spaced from one another along the height direction of the first insertion member.       
 
         [0011]    Preferably, said at least two protrusions are arranged to be staggered from one another along the width direction of the first insertion member. 
         [0012]    Preferably, lower surfaces of the at least two protrusion are planar surfaces extending perpendicularly from the lateral surface of the first insertion member. 
         [0013]    Preferably, the at least two protrusions comprise an upper protrusion and a lower protrusion, wherein an upper surface of the upper protrusion is an oblique surface. 
         [0014]    Preferably, the at least two protrusions comprise an upper protrusion and a lower protrusion, wherein an upper surface of the lower protrusion is a planar surface extending perpendicularly from the lateral surface of the first insertion member. 
         [0015]    Preferably, the number of the first insertion members is no less than two, and said no less than two first insertion members are disposed around the through hole; the at least two protrusions comprise an upper protrusion and a lower protrusion. 
         [0016]    Preferably, upper surfaces of some of the lower protrusions are planar surface extending perpendicularly from the lateral surfaces of the first insertion members; upper surfaces of some of the lower protrusions are oblique surfaces. 
         [0017]    Preferably, at least one of the first insertion member and second insertion member is in the shape of a plate, a plate strip or a rod. 
         [0018]    A second object of the present invention is to provide a connector housing assembly which can be conveniently mounted and stably used, to overcome the drawbacks in the prior art. 
         [0019]    To achieve the above object, the present invention employs the following technical solution. 
         [0020]    A connector housing assembly, characterized in that it comprises:
       a housing provided with a first insertion hole and a second insertion hole; the first insertion hole and the second insertion hole are connected to each other; an inner wall of the first insertion hole is provided with a step protruding out of the inner wall; and   a terminal position assurance member comprising: a base plate, at least one first insertion member and at least one second insertion member; the base plate has an upper surface and a lower surface and extends from the upper surface to the lower surface; a trough hole is provided at a middle portion of the base plate, and the through hole extends from the upper surface to the lower surface; the first insertion member extends from the upper surface of the base plate and protrudes out of the base plate a selected height, and the first insertion member has a lateral surface along its extension direction; the first insertion member is provided with an upper protrusion and a lower protrusion which extend from the lateral surface of the first insertion member and protrude out of the lateral surface of the first insertion member; the upper protrusion and the lower protrusion are arranged to be spaced from one another along the first insertion member in its extension direction;   the terminal position assurance member is disposed at the first insertion hole; the base plate is located outside the first insertion hole and the first insertion member is inserted into the first insertion hole; when the first insertion member is inserted into the first insertion hole, the terminal position assurance member is located at a pre-mounted position and a final position respectively, wherein at the pre-mounted position, the step is located between the upper protrusion and the lower protrusion and retains the first insertion member at this position; at the final position, the lower protrusion passes over the step and is stopped by the step so that the first insertion member is retained at this position and cannot be withdrawn from the first insertion hole.       
 
         [0024]    Preferably, the upper protrusion and the lower protrusion are arranged to be staggered from one another along the width direction of the first insertion member. 
         [0025]    Preferably, a lower surface of the upper protrusion and a lower surface of the lower protrusion are planar surfaces extending perpendicularly from the lateral surface of the first insertion member. 
         [0026]    Preferably, an upper surface of the upper protrusion is an oblique surface. 
         [0027]    Preferably, an upper surface of the lower protrusion is a planar surface extending perpendicularly from the lateral surface of the first insertion member. 
         [0028]    Preferably, the number of the first insertion members is no less than two, and said no less than two first insertion members are disposed around the through hole. 
         [0029]    Preferably, upper surfaces of some of the lower protrusions are planar surfaces extending perpendicularly from the lateral surfaces of the first insertion members; upper surfaces of some of the lower protrusions are oblique surfaces. 
         [0030]    Preferably, the first insertion hole and the second insertion hole are arranged perpendicular to each other. 
         [0031]    A third object of the present invention is to provide a terminal assembly which can be conveniently mounted and stably used, to overcome the drawbacks in the prior art. 
         [0032]    To achieve the above object, the present invention employs the following technical solution. 
         [0033]    A terminal assembly, characterized in that, it comprises:
       a connection terminal;   a terminal base provided with a receiving cavity and an insertion aperture, the connection terminal being disposed within the receiving cavity, the insertion aperture being used to secure the terminal assembly within a corresponding housing; and   a trigger disposed on the terminal base and protruding out of a surface of the terminal base.       
 
         [0037]    Preferably, the terminal base has a mating hole and a cable insertion hole for connecting a mating connector and a cable respectively; the cable extends into the cable insertion hole and is connected with the connection terminal. 
         [0038]    Preferably, it further comprises a shielding structure which is cladded external to the terminal base; the trigger is configured to protrude out of the shielding structure. 
         [0039]    A fourth object of the present invention is to provide a connector which can be conveniently mounted and stably used, to overcome the drawbacks in the prior art. 
         [0040]    To achieve the above object, the present invention employs the following technical solution. 
         [0041]    A connector, characterized in that it comprises the aforesaid connector housing assembly and aforesaid terminal assembly; the terminal base is mounted in the second insertion hole via the terminal position assurance member; the terminal position assurance member is inserted into the first insertion hole. 
         [0042]    Preferably, the terminal position assurance member is located at the pre-mounted position and configured to be movable from the pre-mounted position to the final position. 
         [0043]    Preferably, the terminal assembly is inserted into the second insertion hole of the housing, the trigger pushes the first insertion member to tilt as the terminal assembly is inserted into the second insertion hole so as to enable the first insertion member to be moved further into the first insertion hole until the lower protrusion is stopped by the step. 
         [0044]    Preferably, the terminal assembly is inserted into the second insertion hole of the housing, and the second insertion member is inserted into the insertion aperture to retain the terminal assembly in the second insertion hole of the housing. 
         [0045]    Preferably, the extension direction of the second insertion member is perpendicular to the direction along which the terminal assembly is withdrawn from the second insertion hole. 
         [0046]    Preferably, at least one of the first insertion member and second insertion member is in the shape of a plate, a plate strip or a rod. 
         [0047]    Preferably, the terminal position assurance member is mounted in the first insertion hole via the first insertion member, and the second insertion member retains the terminal base within the second insertion hole. 
         [0048]    According to the terminal position assurance member, the connector housing assembly and the electrical connector in the present invention, the terminal position assurance member is enabled to be pre-mounted and then completely mounted in place when in use. In the pre-mounted state, it can be ensured that the terminal position assurance member is stably connected with the housing without disengagement, and that convenient mounting is provided upon completely mounted. The trigger may be used to deform the first insertion member to reduce the resistance when the terminal position assurance member moves from the pre-mounted state to the completely-mounted state, providing more convenient assembling and saving procedures. The terminal position assurance member, after being completely mounted in place, exhibits stable and firm connection, uneasy disengagement and safe use. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0049]      FIG. 1  is an exploded schematic view of the structure of the present utility mode. 
           [0050]      FIG. 2  is a partial cross sectional schematic view of a housing structure in the present invention. 
           [0051]      FIG. 3  is a schematic view showing the structure of a terminal assembly in the present invention. 
           [0052]      FIG. 4  is a schematic view showing the structure of a terminal position assurance member in the present invention. 
           [0053]      FIG. 5  is a partial sectional schematic view showing the structure when the terminal position assurance member is at a pre-mounted position. 
           [0054]      FIG. 6  is a schematic view showing the structure when the terminal assembly is inserted into the housing, triggering the terminal position assurance member. 
           [0055]      FIG. 7  is a schematic view showing the structure when the terminal position assurance member is at a final position. 
           [0056]      FIG. 8  is a schematic diagram illustrating interaction of the first insertion member with a step when the terminal position assurance member is at the pre-mounted position. 
           [0057]      FIG. 9  is a schematic diagram illustrating interaction of the first insertion member with the step when the trigger is pushing the first insertion member. 
           [0058]      FIG. 10  is a schematic diagram illustrating the interaction of the first insertion member with the step when the terminal position assurance member is at the final position. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0059]    The present invention will be further described with reference to the embodiments and figures. 
         [0060]    As shown in  FIG. 1 , a connector comprises a housing  10 , a terminal assembly  20  and a terminal position assurance member  30 . As will be stated below, upon completion of assembling of the terminal connector, the terminal position assurance member  30  retains the terminal assembly  20  within the housing  10 . The housing  10  and the terminal position assurance member are jointly called a connector housing assembly. 
         [0061]    The housing  10  is used to fixedly mount the terminal assembly  20 . As shown in  FIG. 1  and  FIG. 2 , the housing  10  is provided with a first insertion hole  11  and a second insertion hole  12  to respectively receive the terminal position assurance member  30  and the terminal assembly  20 . For example, an inner wall  13  of the second insertion hole  12  is provided with a structure, such as one or more ribs  14  arranged along the insertion direction, to support the terminal assembly  20 , to facilitate insertion of the terminal assembly  20  into the housing  10  through the second insertion hole  12  and disposed within the second insertion hole  12 . 
         [0062]    The first insertion hole  11  of the housing  10  is provided with a structure to connect with the terminal position assurance member  30 . The terminal position assurance member  30  may be inserted through the first insertion hole  11  and connected in the first insertion hole  11  of the housing  10  so as to retain the terminal assembly  20  in the first insertion hole  11  and second insertion hole  12  of the housing  10 . As shown in  FIG. 1  and  FIG. 2 , an inner wall  15  of the first insertion hole in the housing  10  is provided with one or more steps  16  protruding from the surface thereof A step  16  has an upper step surface  161  and a lower step surface  162 , as shown in  FIG. 8 , to cooperate with the terminal position assurance member  30 . The upper step surface  161  is a withdraw-preventing surface which may prevent the terminal position assurance member  30  from being accidentally withdrew out of the housing  10  from its pre-mounted position or final position. The lower step surface  162  is a stop surface which may prevent the terminal position assurance member  30 , when in its pre-mounted state, from being accidentally moved from its pre-mounted position into its final position. Preferably, the upper step surface  161  and the lower step surface  162  are substantially perpendicular to the axial direction of the first insertion hole  11 . In the example as shown in  FIG. 2 , the first insertion hole  11  and the second insertion hole  12  in the housing are arranged perpendicular to each other to be able to form a connector with a 90-degree angle. 
         [0063]    As shown in  FIG. 1  and  FIG. 3 , the terminal assembly  20  comprises a connecting terminal  21  and a terminal base  22 . The terminal base  22  is provided with a receiving cavity  23 , and the connecting terminal  21  is disposed within the receiving cavity  23  of the terminal base  22 . In the example as shown in  FIG. 3 , the terminal base  22  comprises an upper base  221  and a lower base  222 . The terminal base  22  of the terminal assembly  20  is provided with a mating hole  24  and a cable insertion hole  25 . The cable insertion hole  25  is used to receive a cable (not shown in the figure) and allow it to pass therethrough. The mating hole  24  is used to connect with a mating connector (not shown in the figure) to achieve electrical connection between a cable connected with the terminal assembly  20  and a cable connected with the mating connector. The mating hole  24  is perpendicular to the cable insertion hole  25 . The terminal assembly  20  is provided with a trigger  26  protruding from the terminal assembly  20 . As will be stated below, during assembling of the terminal assembly  20  in the housing  10 , the trigger  26  releases the terminal position assurance member  30  from its pre-mounted position so that the terminal position assurance member  30  may be moved to the final position to lock the terminal assembly  20  in the housing  10 . 
         [0064]    In a preferred embodiment of the present invention, the terminal assembly  20  further comprises a metal shielding layer  27  which is cladded external to the terminal base  22 . The trigger  26  on the terminal assembly  20  is configured to protrude out of the metal shielding layer  27 . The metal shielding layer  27  comprises a connection portion  271  which may be connected with a shielding layer (not shown) in the connected cable. In the example as shown in  FIG. 1  or  FIG. 3 , the terminal assembly  20  is a substantially cuboid structure. In the example as shown in  FIG. 1 , the terminal base  22  is further provided with an insertion aperture  28  which is configured to mate with a second insertion member  35  on the terminal position assurance member  30  to lock the terminal position assurance member  30  within the housing  10  after assembling of the terminal connector. 
         [0065]    As shown in  FIG. 1  and  FIG. 4 , the terminal position assurance member  30  comprises a base plate  31  and a plurality of insertion members (e.g., four first insertion members  32  and two second insertion members  35 ) disposed on the base plate  31 . The base plate  31  has an upper surface  311  and a lower surface  312 . The base plate  31  extends from the upper surface  311  to the lower surface  312 . A through hole  34  is provided at a middle portion of the base plate  31 . The through hole  34  extends from the upper surface  311  to the lower surface  312  to allow the mating connector to pass therethrough during insertion. 
         [0066]    The first insertion member  32  on the terminal position assurance member  30  is used for connection between the terminal position assurance member  30  and the housing  10 . In the example shown in  FIG. 4 , the first insertion member  32  extends from the upper surface  311  of the base plate and protrudes out of the upper surface  311  a selected height which may be determined according to actual situations. The first insertion member  32  is provided with a latching structure to mount the terminal position assurance member  30  on the housing  10 . For example, the latching structure on the first insertion member  32  may be configured as a protrusion  33 . In the example as shown in the figure, the first insertion member  32  may be in the shape of a plate strip and has a lateral surface  321  along its extension direction, onto which the protrusion  33  is disposed. The protrusion  33  comprises an upper protrusion  331  and a lower protrusion  332 . Each of the four first insertion member  32  may be provided with an upper protrusion  331  and a lower protrusion  332 . In the example as shown in  FIG. 4 , the upper protrusion  331  is located above the lower protrusion  332 . The upper protrusion  331  and lower protrusion  332  extend from the lateral surface  321  of the first insertion member and protrude out of the lateral surface  321  of the first insertion member. The upper protrusion  331  and lower protrusion  332  are arranged to be spaced apart from each other along the height direction (namely, the insertion direction of the terminal position assurance member  30 ) of the first insertion member  32 , and staggered from each other along the width direction of the first insertion member  32 . As will be stated in the following embodiment, the upper protrusion  331  and lower protrusion  332  may respectively engage with the step  16  on the housing  10  to retain the terminal position assurance member  30  at the pre-mounted position and final position with respect to the housing  10 . 
         [0067]    In the example shown in  FIG. 4 , the four first insertion members  32  are provided with the same upper protrusions  331 . Upper surfaces  335  of the upper protrusions  331  are all oblique surfaces, for example, the oblique surfaces of the upper surfaces  335  of the upper protrusions extend from the lateral surfaces  321  of the first insertion members towards the base plate  31 . The oblique upper surfaces  335  of the upper protrusions facilitate the upper protrusions to pass over the step  16  to reach the pre-mounted position when the terminal position assurance member  30  is inserted into the first insertion hole  11 , as shown in  FIG. 5 . Lower surfaces  333  of the upper protrusions  331  are planar surfaces extending from and perpendicular to the lateral surface  321  of the first insertion member to cooperate with the upper step surfaces  161  of the steps  16  at the pre-mounted position to prevent the terminal position assurance member  30  from accidentally falling out of the housing  10 . Preferably, the lower surfaces  333  of the upper protrusions are planar surfaces extending perpendicularly from the lateral surface  321  of the first insertion member to provide a retention force that is required by the terminal position assurance member  30  at the pre-mounted position. 
         [0068]    The lower protrusion  332  on the first insertion member  32  can be used to prevent the terminal position assurance member  30  from being further inserted from the pre-mounted position into the housing  10  to reach the final position. In a preferred embodiment of the present invention, the lower protrusion  332  of at least one first insertion member  32  has an upper surface  336  extending perpendicularly to the lateral surface  321  of the first insertion member to provide a desired stopping force to prevent the terminal position assurance member  30  from accidentally completely entering into the housing  10  to reach the terminal position. During assembling of the connector, one or more first insertion members  32  on the terminal position assurance member  30  will contact the trigger  26  on the terminal assembly  20 , the lower protrusion  332  of the first insertion member  32  may be configured to have the upper surface  336  that extends perpendicularly to the lateral surface  321  of the first insertion member. Preferably, the lower protrusions  332  of the remaining first insertion members  32  are each provided with an oblique upper surface. In the terminal position assurance member  30  as shown in  FIG. 4 , the lower protrusions  332  of the two first insertion members  32  located at the left side each has an upper surface  336  that extends perpendicularly to the lateral surface  321  of the first insertion member, and the lower protrusions  332  of the two first insertion members  32  located at the right side each has an oblique upper surface (not shown in the figure). 
         [0069]    A lower surface  334  of the lower protrusion is a planar surface extending from the lateral surface  321  of the first insertion member to cooperate with the upper step surface  161  of the step  16  at the final position so as to prevent the terminal position assurance member  30  from accidentally falling out of the housing  10 . Preferably, the lower surface  334  of the lower protrusion is a planar surface extending perpendicularly from the lateral surface  321  of the first insertion member to provide a retention force that is required by the terminal position assurance member  30  at the final position. 
         [0070]    The second insertion member  35  on the terminal position assurance member  30  is used for connection between the terminal position assurance member  30  and the terminal assembly  20 . The second insertion member  35  extends from the upper surface  311  of the base plate  31  and protrudes out of the upper surface  311  a selected height. Two second insertion members  35  respectively correspond to the insertion apertures  28  on the terminal assembly  20 . Upon completion of the assembling of the terminal connector, the second insertion members  35  on the terminal position assurance member  30  are inserted into the insertion apertures  28  on the terminal assembly  20  to lock the terminal position assurance member  30  in the housing  10 . The second insertion members  25  may be in the shape of a plate strip. The assembling procedure of the terminal connector of the present invention will be described below with reference to the embodiment as shown in  FIG. 5  through  FIG. 8 . During assembling of the terminal assembly  20  and the terminal position assurance member  30  with the housing  10 , the terminal position assurance member  30  is first disposed on the housing  10  and retained at the pre-mounted position as shown in  FIG. 5 . During insertion of the terminal assembly  20  into the second insertion hole  12 , the terminal position assurance member  30  may be released and then moved. The terminal position assurance member  30  may be moved to the final position and then retained at the final position, and maintain the terminal assembly  20  within the second insertion hole  12 . 
         [0071]    As shown in  FIG. 5  and  FIG. 8 , before the terminal assembly  20  is inserted into the second insertion hole  12 , the terminal position assurance member  30  is inserted into the first insertion hole  11  and located at the pre-mounted position. When in the pre-mounted position, the step  16  on the housing  10  is located, along the insertion direction, between the upper protrusion  331  and the lower protrusion  332  on the first insertion member  32  to retain the terminal position assurance member  30  at this position, namely, the pre-mounted position. At the pre-mounted position of the terminal position assurance member  30 , the upper protrusion  331  may prevent the terminal position assurance member  30  from accidentally falling out of the housing  10 , and the lower protrusion  332  prevents the terminal position assurance member  30  from being further inserted into the housing  10  to reach the final position. In a preferred embodiment of the present invention, the upper surfaces  336  of the lower protrusions on the two first insertion members  32  which are located on the left side of the terminal position assurance member  30  extend perpendicularly to the lateral surfaces  321  of the first insertion members to provide a stopping force that is required by the pre-mounted position to prevent the terminal position assurance member  30  from accidentally completely entering into the housing  10  to reach the final position. 
         [0072]    As shown in  FIG. 6  and  FIG. 9 , during mounting of the terminal assembly  20 , the terminal assembly  20  is inserted through the second insertion hole  12  and disposed in the housing  10 , and a front end of the terminal assembly  20  enters into part of the first insertion hole  11 . During insertion of the terminal assembly  20  into the second insertion hole  12 , the trigger  26  on the terminal assembly  20  contacts the upper protrusion  331  on at least one first insertion member  32  and then urges the first insertion member  32  to tilt through an insertion force. When the first insertion member  32  is tilted to a position as shown in  FIG. 9 , the upper surface  336  of the lower protrusion  332  on the first insertion member  32  does not contact the lower step surface  162  of the step  16  on the housing  10  any more so as to release the blocking exerted by the step  16  to the lower protrusion  332  on the first insertion member  32 , reducing the resistance to the lower protrusion  332  for passing over the step  16  and enabling the first insertion member  32  to be further inserted into the first insertion hole  11 . In a preferred embodiment of the present invention, during the insertion of the terminal assembly  20  into the second insertion hole  12 , the trigger  26  on the terminal assembly  20  may release the stop blocking between the step  16  and the lower protrusions  332  on the two first insertion members  32  located at the left side of the terminal position assurance member  30 . The lower protrusions  332  on the two first insertion member  32  located at the right side of the terminal position assurance member  30  are each provided with an oblique upper surface  337 . Hence, when the two first insertion members  32  located at the left side is tilted as stated above, the two first insertion members  32  located at the right side will not block the terminal position assurance member  30  from entering into the first insertion hole  11 . 
         [0073]    Exerting a pushing force onto the terminal position assurance member  30  along its insertion direction to continue to move the first insertion member  32  into the first insertion hole  11  until the lower protrusion  332  passes over the step  16  and is stopped by the step  16 . The lower protrusion  332  is stopped by the step  16  after passing over the step  16  so that the first insertion member cannot be withdrawn from the first insertion hole  11 . The first insertion member  32  is retained at a position as shown in  FIG. 7  and  FIG. 10 , namely, the final position, through the cooperation of the step  16  with the lower surface  334  of the lower protrusion  332 . During movement of the terminal position assurance member  30  from the pre-mounted position to the final position, the second insertion members  35  are inserted into the insertion apertures  28  of the terminal assembly  20 . The second insertion members  35  are perpendicular to the direction in which the terminal assembly  20  is withdrawn from the second insertion hole  12 . Hence, the second insertion members  35  retain the terminal assembly  20  within the connector housing  10 . 
         [0074]    The assembled terminal connector may be connected with a mating connector (not shown). After the terminal connection is connected with the mating connector, electrical connection is formed between the cable connected with the terminal assembly  20  and the cable connected with the mating connector. 
         [0075]    The terminal connector described above may be used for electricity connection in high-voltage lines. When used for high-voltage electricity connection, the terminal assembly  20  is used as a cable fixation member for fixing high-voltage cables, and the terminal connector is then a high-voltage electrical connector. According to a preferred embodiment of the present invention, the terminal connector described above may be used for electrical connection of high-voltage lines of a vehicle such as an electrical vehicle or a hybrid vehicle. 
         [0076]    Embodiments of the present invention are only used to illustrate the present invention and are not construed as limiting the scope of claims. Other substantively equivalent substitutions that can be envisaged by those skilled in the art all fall within the scope of the present invention.