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Battery temperature sensor and housing therefor
| Details |
Inventors: Daugherty, James D.;
Assignee: General Motors Corporation (Detroit, MI)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
Battery temperature sensing device including a sensor embedded in a housing and together secured to the underside of a battery cable terminal for pressing against the side wall of the battery beneath the electrolyte level therein when the terminal is coupled to the battery. The housing conforms to the underside of the terminal and is detachably secured to the terminal by means of a cap which conforms to the topside of the terminal and is adjoined to the housing via snap-in fasteners. |
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DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION FIG.
1 depicts a typical, 12-volt SLI automotive battery 2 including positive and negative terminals 4 and 6, respectively, extending through the sidewall 8 of the battery container.
The battery terminals 4 and 6 each have battery cable terminals 10 and 10', respectively, coupled thereto as they would typically be attached in service.
Cable terminal 10 attached to the positve battery terminal 4 has the temperature sensor housing 12, of the present invention, secured to the underside thereof as will be described in more detail hereafter.
Referring to FIGS.
2-4, the battery cable terminal 10 comprises an electrically conductive eyelet 16 crimped (i.
e.
, by tongs 18) about the bare end 14 of a conductive wire 22 and potted in an elastomeric (i.
e.
, PVC) covering 30.
An insulating sheath 20 covers the conductive wire 22 and is tightly engaged by tongs 24 of the eyelet 16.
Flanged bolt 28 coupled the eyelet 16 to the conductive insert 26 of the battery terminal 4 in known fashion.
The particular cable terminal illustrated is described in more detail in U.
S.
Pat.
No.
3,775,730, Rowles et al, assigned to the assignee of the present invention and does not per se constitute a part of the present invention.
The temperature sensor housing 12 is secured to the underside 29 of the terminal 10 at about the junction between the eyelet 16 and the wire end 14.
A sensor 32 comprises a printed-circuit type thermister and is embedded (e.
g.
, insert molded) in the housing 12 as close to the external surface 34 thereof as is possible in order to obtain as short a thermal conduction path as possible between the sensor 32 and the electrolyte 50 in the battery 2.
Blade-type electrical contacts 36 soldered to the sensor 32 are coupled to lead wires 38 for connecting the sensor 32 to the voltage regulator.
The cable side of the housing 12 substantially conforms to the shape of the cover 30 on the underside 29 of the terminal 10 so as to mate therewith in a manner which subtantially prevents any relative movement between the housing 12 and the terminal 10
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