Patent Publication Number: US-2016234963-A1

Title: Enclosures and methods for removing hydrogen gas from enclosures

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefit and priority of Indian Patent Application No. 433/MUM/2015 filed Feb. 10, 2015. The entire disclosure of the above application is incorporated herein by reference. 
     FIELD 
     The present disclosure relates to enclosures and methods for removing hydrogen gas from enclosures. 
     BACKGROUND 
     This section provides background information related to the present disclosure which is not necessarily prior art. 
     Enclosures may house components that release undesirable gases. For example, some batteries release hydrogen gas when recharging. This hydrogen gas may cause explosions when, for example, the concentration of hydrogen gas in the cabinet rises above about four percent. Typically, enclosures include one or more active systems (e.g., fans, etc.), perforations, etc. to exhaust the hydrogen gas. 
     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. 
     According to one aspect of the present disclosure, an electronic equipment enclosure includes a battery chamber, an equipment chamber positioned above the battery chamber, a ventilation chamber positioned between the battery chamber and the equipment chamber; and a wall extending between the battery chamber and the ventilation chamber. The battery chamber is configured to house one or more rechargeable batteries capable of releasing hydrogen gas over time. The battery chamber includes an inlet for allowing air to enter the battery chamber. The equipment chamber is configured to house at least one electrical component. The wall includes one or more perforations to allow hydrogen gas released by the one or more rechargeable batteries to pass from the battery chamber into the ventilation chamber. The ventilation chamber includes at least one side wall having one or more perforations to allow the hydrogen gas in the ventilation chamber to exit the enclosure. 
     According to another aspect of the present disclosure, an enclosure includes a battery chamber, a ventilation chamber positioned above the battery chamber, and a wall extending between the battery chamber and the ventilation chamber. The battery chamber is configured to house one or more rechargeable batteries capable of releasing hydrogen gas over time. The battery chamber includes an inlet for allowing air to enter the battery chamber. The ventilation chamber includes at least one baffle to restrict water from entering the battery chamber. The wall includes one or more perforations to allow hydrogen gas released by the one or more rechargeable batteries to pass from the battery chamber into the ventilation chamber. The ventilation chamber includes at least one exterior wall having one or more perforations to allow the hydrogen gas in the ventilation chamber to exit the enclosure. 
     Further aspects and areas of applicability will become apparent from the description provided herein. It should be understood that various aspects of this disclosure may be implemented individually or in combination with one or more other aspects. It should also be understood that the description and specific examples herein 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. 1  is a sectional view of an enclosure including a battery chamber, a ventilation chamber and a wall extending between the battery chamber and the ventilation chamber according to one example embodiment of the present disclosure. 
         FIG. 2  is a sectional view of the enclosure of  FIG. 1  with a heat management system adjacent a side wall of the battery chamber according to another example embodiment. 
         FIG. 3  is a sectional view of an enclosure having a battery chamber, an equipment chamber, and a ventilation chamber positioned between the battery chamber and the equipment chamber according to yet another example embodiment. 
         FIG. 4  is a sectional view of the enclosure of  FIG. 3  with a heat management system according to another example embodiment. 
         FIG. 5  is a sectional view of the enclosure of  FIG. 3  with baffles in the ventilation chamber according to yet another example embodiment. 
         FIG. 6  is a sectional view of a ventilation chamber employable in any of the enclosures of  FIG. 1-5  according to another example embodiment. 
         FIG. 7  is a perspective view of a ventilation chamber employable in any of the enclosures of  FIG. 1-5  according to yet another example embodiment. 
         FIG. 8  is a perspective view of a top wall for the ventilation chamber of  FIG. 7 . 
         FIG. 9  is a perspective view of a side joint structure of the ventilation chamber of  FIG. 7 . 
     
    
    
     Corresponding reference numerals indicate corresponding parts or features throughout the several views of the drawings. 
     DETAILED DESCRIPTION 
     Example embodiments will now be described more fully with reference to the accompanying drawings. 
     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. 
     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. 
     An enclosure according to one example embodiment of the present disclosure is illustrated in  FIG. 1 , and indicated generally by reference number  100 . As shown in  FIG. 1 , the enclosure  100  includes a battery chamber  102 , a ventilation chamber  104  positioned above the battery chamber  102 , and a wall  106  extending between the battery chamber  102  and the ventilation chamber  104 . The battery chamber  102  is configured to house one or more rechargeable batteries  108  capable of releasing hydrogen gas over time. The battery chamber  102  includes an inlet  110  for allowing air to enter the battery chamber  102 . The ventilation chamber  104  includes at least one baffle  112  to restrict water from entering the battery chamber  102 . The wall  106  includes one or more perforations  114  to allow hydrogen gas released by the one or more rechargeable batteries  108  to pass from the battery chamber  102  into the ventilation chamber  104 . The ventilation chamber  104  includes at least one exterior wall  120 ,  122  having one or more perforations  118  to allow the hydrogen gas in the ventilation chamber  104  to exit the enclosure  100 . 
     By employing a ventilation chamber above a battery chamber and perforations in walls between the ventilation chamber and battery chamber, hydrogen gas released from rechargeable batteries may be able to naturally exhaust from an enclosure. For example, the enclosure may outgas hydrogen without one or more active cooling systems (e.g., fans, etc.) and/or some passive cooling systems (e.g., a large number of vents, etc.) which may cause turbulence, increased temperatures, increased contaminants (e.g., water, dust, insects, etc.) within the enclosure, etc. As such, the enclosure may efficiently exhaust hydrogen gas to maintain a suitable concentration of hydrogen gas. In some embodiments, the concentration of hydrogen gas may be maintained at (and in some cases below) about one percent. 
     The perforations  114 ,  118  may be positioned in the walls to allow the hydrogen gas to exhaust from the enclosure  100  naturally. For example, and as shown in  FIG. 1 , the perforations  118  are positioned above the perforations  114  of the wall  106  extending between the chambers  102 ,  104 . This configuration allows the hydrogen gas which is less dense and therefore lighter than the surrounding air in the enclosure  100  to rise towards the top portion of the ventilation chamber  104  passing through the lower positioned perforations  114  (relative to the perforations  118 ). As the hydrogen gas continues to rise, it then can pass through the higher positioned perforations  118  (relative to the perforations  114 ) and exit the enclosure  100 . 
     As shown in  FIG. 1 , the ventilation chamber  104  may be defined by multiple external walls and one or more internal walls. For example, the ventilation chamber  104  is defined at least by side external walls (of which walls  120 ,  122  are shown), the wall  106 , and a top external wall  126  (e.g., a ceiling) opposing the wall  106 . In the example embodiment of  FIG. 1 , each side wall  120 ,  122  includes one perforation  118  to allow the hydrogen gas in the ventilation chamber  104  to exit the enclosure  100  as indicated by the arrows  127  of  FIG. 1 . 
     Similarly, the battery chamber  102  may be defined by multiple external walls and one or more internal walls. As shown in the example of  FIG. 1 , the battery chamber  102  is defined by a bottom external wall  128  (e.g., a floor, etc.), the wall  106 , and side external walls (of which walls  130 ,  132  are shown) extending between the wall  106  and the bottom wall  128 . Thus, in the example of  FIG. 1 , the battery chamber  102  and the ventilation chamber  104  share the wall  106  extending therebetween. 
     Alternatively, the battery chamber  102  and the ventilation chamber  104  may include separate walls coupled together to form a wall extending between the battery chamber  102  and the ventilation chamber  104 . In such examples, each separate wall may include aligned perforations to allow hydrogen gas released by the rechargeable batteries  108  to pass from the battery chamber  102  into the ventilation chamber  104  as explained above. 
     Furthermore, the example ventilation chamber  104  of  FIG. 1  includes two baffles  112  for restricting water from entering the battery chamber  102 . In particular, the baffles  112  each include a slanted portion extending from the top side of the shared wall  106  inside the ventilation chamber  104 . For example, the baffles  112  may extend inwardly from the shared wall  106  at a defined angle (e.g., about 45 degrees as shown in  FIG. 1 , about 60 degrees, about 90 degrees, etc.). Additionally, and as shown in  FIG. 1 , each baffle  112  is adjacent an outermost perforation  114  of the shared wall  106 . As such, water and/or other contaminants that may enter the ventilation chamber  104  via the perforations  118  may be trapped between the baffles  112 , the wall  106 , and the walls  120 ,  122  and thus restricted from entering the battery chamber  102  through the perforations  114 . In such cases, the ventilation chamber  104  may include a drainage system to remove the water and/or other contaminants. 
     As explained above, the battery chamber  102  includes the inlet  110  for allowing air to enter the enclosure  100 . For example, and as shown in  FIG. 1 , one of the side walls (e.g., the back side wall extending between the side walls  130 ,  132 ) of the battery chamber  102  includes the inlet  110  adjacent the bottom wall  128 . In the particular example of  FIG. 1 , the inlet  110  includes twelve perforations for allowing air (e.g., ambient air, etc.) to enter the enclosure  100 . 
     Although the inlet  110  of  FIG. 1  includes twelve perforations, it should be apparent that more or less perforations and/or another suitable inlet may be employed to allow a sufficient amount of air to enter the battery chamber  102  to assist in exhausting the hydrogen gas from the enclosure as explained above. Additionally, although  FIG. 1  illustrates the back side wall as including the inlet  110 , it should be apparent to those skilled in the art that one or more other walls (e.g., the side walls  130 ,  132 , the bottom wall  128 , etc.) of the battery chamber  102  may include one or more inlets in addition and/or alternative to the inlet  110 . 
     The rechargeable batteries  108  of  FIG. 1  are shown as battery stacks including multiple batteries. For example, and as shown in  FIG. 1 , the enclosure  100  includes four rechargeable battery stacks each including multiple batteries. The rechargeable batteries  108  may be used to provide backup power to a load when a primary power source (e.g., rectifiers, etc.) is unable to provide adequate power. Although the enclosure  100  is shown to include four rechargeable battery stacks  108 , it should be apparent that more or less rechargeable batteries stacks may be employed without departing from the scope of the disclosure. 
     Additionally, although  FIG. 1  illustrates the shared wall  106  as including three perforations  114  and the walls  120 ,  122  as including one perforation  118 , it should be apparent that each wall may include more or less perforations without departing from the scope of the disclosure. For example, the wall  120  may include two perforations, the wall  122  may include three perforations, and the shared wall  106  may include five perforations. 
     In some embodiments, the enclosure may include one or more thermal management systems. For example,  FIG. 2  illustrates another example enclosure  200  similar to the enclosure  100  of  FIG. 1 . For example, the enclosure  200  includes a battery chamber  202  and a ventilation chamber  204  substantially similar to the battery chamber  102  and the ventilation chamber  104  of  FIG. 1 . The enclosure  200  of  FIG. 2 , however, includes a thermal management system  226  adjacent the side wall  132  of the battery chamber  202 . The thermal management system  226  may include, for example, a shroud, one or more heat generating components (e.g., heaters, etc.), one or more heat dissipating components (e.g., heat exchangers, thermoelectric (TEC) assemblies, fans, heat sinks, etc.), etc. In some embodiments, the heat management system  226  may be a part of a door for the enclosure  200 . 
     Although  FIG. 2  illustrates the thermal management system  226  as being adjacent the side wall  132 , it should be apparent that a portion of or the entire thermal management system  226  may be adjacent another suitable wall and/or area of the enclosure  200  if desired. 
     As shown in  FIG. 2 , the enclosure  200  includes perforations on various walls. For example, the wall  126  includes two perforations  220  and the walls  120 ,  122  include one perforation  118  as explained above. Additionally, and as shown in  FIG. 2 , the enclosure  200  includes at least one perforation  210  (e.g., sometimes referred to as an inlet) on the side wall  130  of the battery chamber  202  allowing air to enter the battery chamber  202  as explained above. 
     In the example of  FIG. 2 , the enclosure  200  includes a filter  224  adjacent each perforation  114  of the shared wall  106  extending between the chambers  102 ,  104 . The filters  224  allow the hydrogen gas to pass and restrict water and/or other contaminants from entering the battery chamber  202 . The filters  224  may be any suitable filter. Additionally, although  FIG. 2  illustrates a filter  224  adjacent each perforation  114 , it should be apparent one or more perforations  114  may not include a filter or the like if desired. Further, in some embodiments, filters (e.g., similar to the filters  224 , etc.) may be positioned adjacent the perforations  118  and/or the perforations  220  to allow the hydrogen gas to pass and restrict water and/or other contaminants from entering the ventilation chamber  204 . 
     In some embodiments, the ventilation chamber and/or the battery chamber may include a solar shield adjacent to any one or more of its exterior walls. For example, and as shown in  FIG. 2 , the ventilation chamber  204  includes a solar shield  234  adjacent the top exterior wall  126  and/or adjacent one or both of the side walls  120 ,  122 . The solar shield  234  may be any suitable shield that reflects at least some solar energy while allowing the hydrogen gas to exit from the enclosure  200 . For example, the solar shield  234  may be a component of one or more ventilation chamber walls. In such cases, the ventilation chamber wall(s) may be formed of a particular material to reflect solar energy. In other examples, the solar shield may include a material (e.g., a film, paint, etc.) coupled to the ventilation chamber wall(s). For example, the wall and/or the solar shield may be formed of aluminum (e.g., anodized aluminum, etc.), a fiberglass material, and/or another suitable material that has a desired reflection coefficient (e.g., a ratio of the radiation flux reflected by a surface to the incident radiation flux). 
     Further, and as shown in  FIGS. 1 and 2 , the enclosures  100 ,  200  include the rechargeable battery stacks  108  but no other electronic equipment. Thus, the enclosures  100 ,  200  of  FIGS. 1 and 2  may be considered a battery enclosure. Additionally and/or alternatively, the enclosure  100  may include one or more other components including, for example, control circuits, power components (e.g., rectifiers, converters, etc.), etc. In such examples, the enclosure may be considered an electronic equipment enclosure. 
     For example,  FIG. 3  illustrates an electronic equipment enclosure  300  having a battery chamber  302 , an equipment chamber  336  positioned above the battery chamber  302 , and a ventilation chamber  304  positioned between the battery chamber  302  and the equipment chamber  336 . The battery chamber  302  is substantially similar to the battery chamber  102  of  FIG. 1  and the ventilation chamber  304  is substantially similar to the ventilation chamber  104  of  FIG. 1  but without the baffles  112 . For example, the battery chamber  302  includes various walls (e.g., the wall  106 , etc.), houses two stacks of the rechargeable batteries  108  capable of releasing hydrogen gas over time, and an inlet  310  (e.g., similar to the inlet  210  of  FIG. 2 ) for allowing air to enter the chamber  302 . 
     Similar to the enclosure  100  of  FIG. 1 , the enclosure  300  of  FIG. 3  includes the ventilation chamber  304  positioned above the battery chamber  302  and the wall  106  extending between the battery chamber  302  and the ventilation chamber  304 . The ventilation chamber  304  of  FIG. 3  is defined by the side walls  120 ,  122 , the wall  106 , and a top wall  326 . As shown in  FIG. 3 , each side wall  120 ,  122  includes two perforations  318  for allowing air, hydrogen gas, etc. to escape. 
     As shown in  FIG. 3 , the equipment chamber  336  has multiple walls for defining an interior for housing electrical component(s)  340 . For example, the equipment chamber  336  includes a top wall  338 , the wall  326 , and side walls (e.g., walls  320 ,  322 , etc.) extending between the walls  326 ,  338 . The electrical component(s)  340  may include, for example, converters, rectifiers, control circuits, etc. 
     In the example of  FIG. 3 , the equipment chamber  336  and the ventilation chamber  304  share the wall  326 , and the ventilation chamber  304  and the battery chamber  302  share the wall  106  (as explained above). Alternatively, one or more chambers may include separate walls coupled together to form a wall extending between the equipment chamber  336  and the ventilation chamber  304  and/or the battery chamber  302  and the ventilation chamber  304  as explained above. 
     If hydrogen gas is released from the batteries  108  (e.g., outgassed, etc.), the hydrogen gas may flow into the ventilation chamber  304  via the perforations  114  as explained above. Additionally, negative pressure within the enclosure  300  may be created by allowing air (e.g., ambient air, etc.) to enter the battery chamber  302  via the inlet  310  (as explained above) and flow into the ventilation chamber  304  thereby generating an air flow path to assist in removing the hydrogen gas. After which, the gas and/or air may be exhausted from the enclosure  300  via the perforations  318  of the side walls  120 ,  122 . 
     In some example embodiments, the equipment chamber  336  may be sealed to protect the electrical component(s)  340  from contaminants (e.g., the hydrogen gas released from the batteries  108 , water, etc.). As such, the equipment chamber  336  may be considered a sealed equipment chamber (e.g., environmentally sealed, etc.). In such examples, the chamber  336  may not include cutouts (or the like) that allow a free exchange of air including contaminants to enter. Thus, and as shown in  FIG. 3 , the wall  326  extending between the equipment chamber  336  and the ventilation chamber  304  does not include perforations or the like. If appropriate, the sealed enclosure may include gaskets, seals, potting, filters (as explained herein), etc. to protect the interior of the cabinet from contaminants (e.g., moisture, dirt, air, dust, etc.). 
       FIG. 4  illustrates another example electronic equipment enclosure  400  substantially similar to the electronic equipment enclosure  300  of  FIG. 3 . The electronic equipment enclosure  400  of  FIG. 4 , however, includes a thermal management system  424  adjacent one side (e.g., side walls) of the equipment chamber  336 , the ventilation chamber  304 , and the battery chamber  302 . The thermal management system  424  of  FIG. 4  may be substantially similar to the thermal management system  226  of  FIG. 2 . The thermal management system  424  of  FIG. 4 , however, may include perforations or the like to allow hydrogen gas to pass therethrough. 
     Additionally, the enclosure  400  of  FIG. 4  may include one or more solar shields adjacent to any one or more of its exterior walls. For example, the enclosure  400  includes a solar shield  434  adjacent the top exterior wall  338  and/or parts of all side walls (e.g., the side walls  320 ,  322 ) of the equipment chamber  336 . The solar shield  334  of  FIG. 4  may be substantially similar to the solar shield  234  of  FIG. 2 . 
     In some embodiments, the enclosure may include one or more baffles and/or filters for restricting water from entering the battery chamber. For example,  FIG. 5  illustrates an electronic equipment enclosure  500  substantially similar to the enclosure  400  of  FIG. 4 , but including two baffles  512  positioned in the ventilation chamber and filters  524  adjacent perforations of the shared wall extending between the battery chamber and the ventilation chamber. The baffles  512  and the filters  524  may be substantially similar to the baffles  112  of  FIG. 1  and the filters  224  of  FIG. 2 . 
     As explained above, the ventilation chambers disclosed herein may include a shared wall having one or more perforations. For example, the ventilation chambers of  FIGS. 1-5  include three perforations. Alternatively, the ventilation chambers may include more or less perforations if desired. For example,  FIG. 6  illustrates another ventilation chamber  604  including six perforations  614 , six filters  624  adjacent (e.g., covering, etc.) the perforations  614 , and two baffles  612  adjacent the outermost perforations  614 . The perforations  614 , the filters  624 , and the baffles  612  may be substantially similar to any one of the other perforations, the filters, and the baffles disclosed herein. The ventilation chamber  604  may be employed in any one of the enclosures of  FIG. 1-5 . 
       FIG. 7  illustrates another example ventilation chamber  704  including a top wall  706 , a bottom wall  708  opposing the top wall  706 , and four side walls  710 ,  712 ,  714 ,  716  extending between the walls  706 ,  708 . As shown in  FIGS. 7 and 8 , the top wall  706  is a solid plate. 
     The ventilation chamber  704  may be employed in any one of the enclosures of  FIG. 1-5 . As such, the top wall  706  may be an external top wall of an enclosure if the enclosure does not include an equipment chamber above the ventilation chamber  704 . Alternatively, if an enclosure includes an equipment chamber above the ventilation chamber  704 , the top wall  706  may be a shared wall between the ventilation chamber  704  and the equipment chamber. 
     The bottom wall  708  may be positioned between the ventilation chamber  704  and a battery chamber including rechargeable batteries as explained above. As such, the bottom wall  708  includes perforations  718  to allow hydrogen gas released by the rechargeable batteries to pass from the battery chamber into the ventilation chamber  704  as explained above. In the example of  FIG. 7 , the bottom wall  708  includes nine perforations  718 . Alternatively, more or less perforations may be employed without departing from the scope of the disclosure. 
     Additionally, although not shown, at least one of the side walls  710 ,  712 ,  714 ,  716  and/or the top wall  706  may include one or more perforations to allow the hydrogen gas in the ventilation chamber  704  to exit an enclosure. 
       FIG. 9  illustrates a bracket  900  including a top wall  904 , a bottom wall  906 , and a side wall  902  extending between the walls  904 ,  906 . The bracket  900  may be used as a portion of any one of the ventilation chambers disclosed herein. For example, the ventilation chamber  704  may include two brackets  900  extending along opposing sides of the ventilation chamber  704 . In such cases, the side wall  902  of each bracket  900  may be part of, the entire portion of, etc. one of the side walls (e.g., walls  710 ,  712 ,  714 ,  716 ) of the ventilation chamber  704 . Additionally, each top wall  904  and bottom wall  906  of the bracket  900  may be coupled to the wall  706  and the wall  708 , respectively, of the ventilation chamber  704  via fasteners (e.g., screws, rivets, etc.), weld, etc. 
     As explained above, hydrogen gas released from rechargeable batteries in an enclosure may be exhausted by passing (e.g., venting, exhausting, etc.) hydrogen gas from a battery chamber of the enclosure to a ventilation chamber of the enclosure via perforations in a wall between the two chambers. The hydrogen gas may be exhausted from the enclosure by passing the hydrogen gas from the ventilation chamber via one or more additional perforations in one or more exterior walls of the ventilation chamber. 
     As such, the enclosures disclosed herein may provide low cost solutions for exhausting hydrogen outgassed from rechargeable batteries within the enclosures while complying with applicable standards (e.g., Telcordia requirements, etc.). Additionally, the enclosures may efficiently exhaust hydrogen gas without substantially impacting thermal performance of the enclosures. 
     The enclosures may be deployed outdoors and/or indoors (provided appropriate external ventilation). The enclosures may be used as telecommunications enclosures, battery enclosures, power enclosures, etc. In some embodiments, at least a portion of the enclosures may include environmentally sealed portions (as explained above) depending on the filters, gaskets, seals, potting, etc. 
     The enclosures and/or chambers disclosed herein may be any suitable material, size, shape, etc. For example, the ventilation chambers may have a height of about 1.5 inches. Alternatively, the ventilation chambers may have a height of more or less than about 1.5 inches if desired. The walls of the chambers may be formed of one continuous piece of material or formed of multiple pieces of material. For example, the walls may be formed of sheet metal, the walls (including portions of) may be defined by equipment housed in the chamber, etc. 
     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 disclosure. 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. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.