Battery pack

Abstract

A battery pack including a housing having a first portion and a second portion coupled to the first portion. The first portion has a first wall and an interface extends from the first wall. The interface includes a plurality of terminal apertures that provide access to electrical terminals within the housing. The second portion has a second wall, and the second wall is positioned opposite the first wall. A first plurality of vents extends through the first wall and a second plurality of vents extends through the second wall. A cumulative surface area of the first plurality of vents is different than a cumulative surface area of the second plurality of vents.

What is claimed is: 
     
         1 . A battery pack comprising:
 a housing having a first portion and a second portion coupled to the first portion, the first portion having a first wall and an interface extending from the first wall, the interface including a plurality of terminal apertures that provide access to electrical terminals within the housing, the second portion having a second wall, the second wall being positioned opposite the first wall;   a first plurality of vents extending through the first wall, the first plurality of vents defining a first cumulative surface area; and   a second plurality of vents extending through the second wall, the second plurality of vents defining a second cumulative surface area;   wherein a sum of the first cumulative surface area and the second cumulative surface area is greater than two percent of a total surface area of the housing.   
     
     
         2 . The battery pack of  claim 1 , wherein the first cumulative surface area is at least two percent of a total surface area of the housing. 
     
     
         3 . The battery pack of  claim 1 , wherein the first plurality of vents includes one or more louvres that direct airflow into the housing and prevent the ingress of fluid and solid obstructions into the housing. 
     
     
         4 . The battery pack of  claim 1 , wherein the interface further includes a pair of rails and a pair of grooves, each of the pair of rails being spaced apart from the first wall and each of the pair of grooves at least partially defined between one of the rails and the first wall and a groove wall extending between the respective one of the rails and the first wall, the interface further including a plurality of vents extending through each of the groove walls and a plurality of vents positioned opposite the plurality of terminal apertures. 
     
     
         5 . The battery pack of  claim 1 , wherein the interface further includes a pair of rails and a pair of grooves, each of the pair of rails being spaced apart from the first wall and each of the pair of grooves at least partially defined between one of the rails and the first wall and a groove wall extending between the respective one of the rails and the first wall, the interface further including a plurality of vents positioned opposite the plurality of terminal apertures. 
     
     
         6 . The battery pack of  claim 5 , wherein a cumulative surface area defined by each of the plurality of vents in the first wall, the second wall, the interface, and the plurality of terminal apertures is greater than two percent of a total surface area of the housing. 
     
     
         7 . The battery pack of  claim 1 , further comprising a battery cell holder enclosed within the housing and configured to receive and secure a plurality of battery cells, the battery cell holder including a first wall and a second wall opposite the first wall, the first wall including a first plurality of vents and the second wall including a second plurality of vents, each of the first plurality of vents of the battery cell holder positioned adjacent to one or more of the first plurality of vents in the first wall of the housing, each of the second plurality of vents of the battery cell holder positioned adjacent to one or more of the second plurality of vents in the second wall of the housing. 
     
     
         8 . The battery pack of  claim 7 , wherein each of the battery cells is axially compressed within the battery cell holder. 
     
     
         9 . The battery pack of  claim 7 , wherein each of the first and second plurality of vents in the battery cell holder includes a louver that directs airflow relative to the housing and prevents the ingress of fluid and solid obstructions into the housing. 
     
     
         10 . The battery pack of  claim 7 , further comprising a printed circuit board supported by the battery cell holder, the battery cell holder including at least one pin that receives an aperture of the printed circuit board. 
     
     
         11 . The battery pack of  claim 10 , further comprising a terminal block at least partially positioned within the interface and at least partially surrounding the electrical terminals, the terminal block including a plurality of terminal apertures configured to align with the plurality of terminal apertures in the interface, the terminal block further including at least one aperture configured to align with the aperture in the printed circuit board and configured to receive the at least one pin therethrough. 
     
     
         12 . A battery pack comprising:
 a housing having a first wall, a second wall opposite the first wall, and an interface extending from the first wall;   a first plurality of vents extending through the first wall, the first plurality of vents defining a first cumulative surface area; and   a second plurality of vents extending through the second wall, the second plurality of vents defining a second cumulative surface area;   wherein a sum of the first cumulative surface area and the second cumulative surface area is greater than two percent of a total surface area of the housing.   
     
     
         13 . The battery pack of  claim 12 , wherein the first plurality of vents includes one or more louvres that direct airflow into the housing and prevent the ingress of fluid and solid obstructions into the housing. 
     
     
         14 . The battery pack of  claim 12 , further comprising a battery cell holder enclosed within the housing and configured to receive and secure a plurality of battery cells, the battery cell holder including a first wall and a second wall opposite the first wall, the first wall of the battery cell holder positioned adjacent the first wall of the housing and the second wall of the battery cell holder positioned adjacent the second wall of the housing, at least one of the first wall and the second wall of the battery cell holder including a plurality of battery cell holder vents positioned adjacent to one or more of the respective first plurality of vents extending through the first wall or second plurality of vents extending through the second wall. 
     
     
         15 . The battery pack of  claim 14 , wherein at least a portion of the plurality of battery cell holder vents includes louvers. 
     
     
         16 . The battery pack of  claim 14 , further comprising a printed circuit board supported by the battery cell holder, the battery cell holder including at least one pin that receives an aperture of the printed circuit board. 
     
     
         17 . The battery pack of  claim 12 , further comprising
 a battery cell holder enclosed within the housing and configured to receive and secure a plurality of battery cells, the battery cell holder including
 a first wall positioned adjacent the first wall of the housing, the first wall of the battery cell holder having an aperture extending therethrough and providing access to at least one of the plurality of battery cells, and 
 a second wall opposite the first wall; 
   battery pack circuitry supported by the battery cell holder nearer to the first wall of the battery cell holder than to the second wall of the battery cell holder; and   a temperature measuring assembly supported by the battery cell holder and in electrical communication with the battery pack circuitry to measure the temperature of the at least one of the plurality of battery cells, the temperature measuring assembly including a sensor having a first end in electrical communication with the battery pack circuitry and a second end extending through the aperture in the first wall of the battery cell holder, the second end configured to directly contact the at least one of the plurality of battery cells.   
     
     
         18 . The battery pack of  claim 13 , wherein the battery pack circuitry is secured to a support member that is supported by the battery cell holder, and wherein the battery cell holder includes at least one pin extending from the first wall of the battery cell holder, the at least one pin receiving an aperture of the support member. 
     
     
         19 . A battery pack comprising:
 a housing having a first wall, a second wall opposite the first wall, and an interface extending from the first wall; and   a first plurality of vents extending through the first wall, the first plurality of vents defining a first cumulative surface area;   wherein the first cumulative surface area is at least two percent of a total surface area of the housing.   
     
     
         20 . The battery pack of  claim 19 , further comprising a second plurality of vents extending through the second wall, the second plurality of vents defining a second cumulative surface area, wherein the second cumulative surface area is less than one percent of the total surface area of the housing.